Bolometric hygrometer, stove or furnace using it and method for controlling operation mode of stove or furnace

FIELD: hygrometers with bolometric heat sensitive member, stove or furnace using such hygrometer and method for controlling stove or furnace.

SUBSTANCE: hygrometer includes two static bolometric heat sensitive members for accurate detection of humidity value. Stove or furnace includes bolometric hygrometer secured to one side of bracket in air discharge opening for deflecting direction of air flow in order to detect humidity value at high accuracy in cooking chamber. Method for controlling operation mode of stove or furnace provides different periods of heat treatment of food products in package or without it.

EFFECT: enhanced accuracy of humidity measuring.

13 cl, 15 dwg

 

The technical field

The present invention relates to a hygrometer with bolometric temperature-sensitive element having a positive temperature coefficient, in which the resistance is linearly dependent on temperature changes, to the stove or furnace with bolometric the hygrometer and the method of regulating the stove or oven.

Prior art

In General, for a microwave oven in which food is heated by microwaves, characterized by the appearance of moisture on the inner surface of the door and/or on the inner wall of the cooking chamber due to evaporation of water in the cooking chamber, arising in the process of heating food. To prevent this, use a fan to supply the required quantity of dry air in the cooking chamber to exhaust air out of the cooking chamber. Microwave is equipped with a hygrometer at the air outlet humidity of the air in order to provide automatic cooking by determining the degree of heating of the food in accordance with the humidity. Among hygrometers used for microwave ovens, it is common hygrometer with thermistor element in which the resistance varies with temperature.

With reference to the drawings will be explained hygrometer with thermistor element and the method of regulation of mi is romanovas furnace with a hygrometer. Figure 1 shows a section known hygrometer thermistor type, figure 2 shows a front view and a top view, and figure 3 shows its schema.

According to figure 1 known hygrometer thermistor type has two cavities formed by the base 11 and the cap 12, thermistor 13 to determine the moisture, located in one of the cavities, and thermistor 14 for temperature compensation, is located in the other cavity. Each of thermistors 13 and 14 is connected to pin pins 15 passing through the base 11, using a platinum wire 16 to form a chain. At the top of the cap 12 from thermistor 13 to determine the moisture indicator made a hole 17 for the inlet of water vapor. thermistors 13 and 14 are thermistors with a negative temperature coefficient, in which the temperature and resistance are inversely proportional.

According to figure 2 the hygrometer on thermistor with a negative temperature coefficient has a front housing 1 and rear housing 2 to form cavities for the appropriate placement of thermistors, heating the node 3, installed in the front part of the housing 1 for accommodating conductors 13 and 14 and supporting its temperature, shielded wire 5 connected to the pin terminals for signal transmission device and prevent noise. For burkinabes made many mounting holes.

According to figure 3 hygrometer thermistor type has a thermistor 13 to determine the moisture content, thermistor 14 for temperature compensation, connected in series with thermistor 13 to determine the moisture to compensate for changes in voltage caused by changes in resistance of thermistor 13 to determine the moisture content, the amplifier 100 having an inverting (-) input to obtain the output voltage of thermistor 13 to determine the moisture content and non-inverting (+) input for receiving voltage and is designed to amplify the difference voltage, and a variable resistor VR (VR - an acronym for "variable resistor" - "variable resistor", comment. translation.) to ensure the output voltage caused by the resistance change of thermistor 13 to determine the moisture and supply voltage on non-inverting (+) input of amplifier 100. The above hygrometer thermistor type determines the moisture content based on the difference of the resistance caused by the temperature difference between thermistor 13 to determine the moisture content and thermistor 14 for temperature compensation when water vapor enters thermistor 13 to determine the humidity through the indicator hole 17 in the cap 12.

Will also explain the known method of automatic control plate or oven, with a hygrometer thermistor type is. Figure 4 presents a flowchart showing the operation of the known method of regulating the stove or furnace with hygrometer thermistor type.

According to figure 3 and 4, when the user selects the mode of heat treatment in the stove or oven for heat treatment of food to the desired state in the stove or furnace to operate the fan (not shown) on the pre-purge period (S10) and determines the completion of purging (S11). When determined (S11), the purge is completed, operate the magnetron (not shown) and then if thermistor to determine the moisture content determines the change of humidity in the stove or furnace, the fan continues blowing (S13). That is, the resistance of thermistor to determine the moisture content changes due to water vapor arising in the stove or oven when the introduction of the magnetron, and the output voltage change with resistance. Then the output voltage V1 of thermistor to determine the moisture content is served to the inverting (-) input of amplifier 100 and determined (S14) zero balance. That is, for setting the output voltage of the amplifier 100 in the initial state, i.e, the magnitude of the output signal V0, the resistance of the variable resistor VR during operation of the magnetron tuned so that the voltage V2 on reinvestiruet (+) input of amplifier 100 sowade the voltage V1, supplied to the inverting (-) input of amplifier 100. Then, when you reach a zero balance (S14) determine whether or not the setting values of the output signal V0 from the amplifier 100 initial value Vref (S15). If the result of determination (S15) found that the magnitude of the output signal V0 is set to the initial value Vref, it is determined, is there a change in the voltage ΔV required for a particular menu in relation to the initial size of the sensor. That is, after the sensor output V0 is set equal to the initial value Vref, between the voltage according to the menu selected by the user, and the initial value of the sensor Vref there is a change in the voltage ΔV, and determine the achievement of the output signal of the sensor V0 voltage ΔV. If the result of determination (S16) find that the sensor output V0 reaches a voltage change ΔV according to the menu in relation to the initial value of the sensor Vref, counting period T1 required to change the voltage ΔV, to calculate the main period of operation (S17). Then the magnetron operates during the primary period (period T2) and the fan conducts blowing for cooking, after which the magnetron and the fan turned off (S18). If the sensor output V0 is set to initial the size of the sensor Vref, determine expired whether a predetermined period of operation of the magnetron (S19). If the result of determination (S19) found that a predefined period of operation of the magnetron has expired, set (S20), the initial value of the sensor Vref, then increase period of the increase of current with voltage values ΔV for 1 second (S21), determine the achievement of voltage ΔV according to the menu in relation to the initial value of the sensor Vref (S22). In the result of the determination (S22), if the change in voltage has not reached the change voltage ΔV according to the menu, the process proceeds to operation (S21) increase time voltage ΔV for 1 second. In contrast, if the change in the voltage reaches a voltage change ΔV according to the menu, perform the operation (S17) the calculation of the basic work period T2 by calculating the period of time T1 required to reach a voltage change ΔV. meanwhile, if the result of the operation definition (S16) is detected as the sensor output V0 reaches a voltage change ΔV according to the menu in relation to the initial value of the sensor Vref, perform the operation (S21) increase the period of the current voltage values ΔV 1 second up until the change in the voltage reaches the value required from the public menu. Ultimately, the change of humidity in the oven or furnace is expressed by the output signal of the sensor V0 hygrometer thermistor type.

Figure 5 presents a graph showing the properties of known hygrometer thermistor type, from which it can be understood that thermistor element with a negative temperature coefficient has a non-linear change in resistance depending on temperature change. That is, thermistor element with a negative temperature coefficient has a non-linear inverse relationship, for which the resistance decreases with increasing temperature, and therefore clear the difficulty of predicting the temperature when humidity changes, because the sensor output is not linear. Because of this, not the exact determination of moisture when known hygrometer thermistor type placed in the vent hole of the stove or furnace and determines the humidity in the cooking chamber. Finally, the microcomputer may not know the exact value of the temperature of heat treatment of food and, therefore, may not accurately regulate the output of the magnetron and the fan. Namely, if the selected function of maintaining food temperature constant, this disadvantage becomes so obvious that the user is unable to properly maintain the temperature of food is constant. Moreover, in case of use of the stove or furnace with a known hygrometer thermistor type, the regulation of the period of heat treatment is not possible if the food is in the package, because the stove or furnace is not equipped with any of the accounts of the measuring device for the case with food in the package.

At the same time in order to maintain thermal equilibrium between the famous hygrometers thermistor type for the cap and base is provided for closing elements, which are located in heating the node attached to the housing by welding. When the hygrometer is installed on a bracket or something similar plate or oven, be careful, because between the housing and the bracket there is good thermal contact. As a consequence, the above condition complicates the manufacturing process of the hygrometer and complicates the installation of the hygrometer in the stove, or furnace, or something similar.

The invention

Accordingly, the present invention is directed to the creation of bolometric hygrometer, stove or furnace with bolometric a hygrometer and method for controlling plate or stove, which essentially eliminate one or more of the problems due to limitations and disadvantages of the known means.

The purpose of this invention is the provision bolometric hygrometer, to whom or for accurate determination of moisture content is used bolometric element, having a linear characteristic, and which is simple to manufacture.

Another purpose of this invention is the provision of a stove or furnace with bolometric a hygrometer in which the bolometric hygrometer is installed so that it is possible to accurately determine the humidity in the cooking chamber.

Another purpose of this invention is the provision of a method of regulating the stove or furnace, which allows the user the best way to carry out heat treatment through the use of bolometric hygrometer.

Additional characteristics and advantages of the invention will be set forth hereinafter in the description and will partly be obvious from the description or can be learned in the practical use of the invention. The objectives and other advantages of the invention will be realized and attained by the structure shown in the above-stated description and the appended claims, and attached drawings.

To achieve these and other advantages and in accordance with the present invention, as implemented and broadly described, a bolometric hygrometer includes a housing, the base having a main indicator slot in the housing to intake of water vapor, a cap mounted on the upper part of the reason for the formation of cavities, bolometric sensing element DL the determination of moisture content, having a resistance that changes depending on the temperature in the cavity communicating with an open main indicator hole, bolometric temperature-sensitive element for temperature compensation having a resistance that changes depending on the temperature in the cavity, not communicating with the main indicator hole, and shielded wire connected to the bolometric temperature-sensitive elements, for transmitting signals and prevent noise.

Bolometric sensing elements formed on a semiconductor wafer and are bolometric temperature-sensitive elements with a positive temperature coefficient, each of which has a resistance that is linearly dependent on temperature changes.

Bolometric temperature-sensitive elements are connected with shielded wires and three pin pins passing through the base, so that one element is connected with one pin output, respectively, and the remaining pin is connected to both elements.

The housing includes a rear portion having a support for maintaining the cap and the base, and the base is located on the side of the open surface, and a front part having a size slightly smaller than the rear part, for pressing and fixing the support./p>

The front part has many additional indicator of holes formed in the surface facing to the base in the direction of forward inlet water vapor, with indicator holes are made in areas remote from the center of the front part.

In addition, the bolometric hygrometer includes a circuit containing an amplifier, having an inverting (-) input to obtain the output voltage corresponding to the humidity set bolometric temperature-sensitive element for determination of moisture, non-inverting (+) input for receiving a predetermined reference voltage and is designed to amplify the difference between the output voltage and the reference voltage, a variable resistor for supplying the reference voltage at the noninverting (+) input of the amplifier and a resistor having one end connected to the variable resistor, and the other end connected to the bolometric temperature-sensitive element for temperature compensation.

The bridge circuit formed by combination of the bolometric temperature-sensitive element for measuring humidity and resistor with bolometric temperature-sensitive element for temperature compensation and a variable resistor.

Another aspect of the present invention is a stove or furnace with bolometric the hygrometer containing cooking chamber is in the body of the stove or furnace, having a cavity for placement of food, magnetron, providing heat for heating food, a fan for circulating air inside the cooking chamber, an l-shaped bracket located on the end of the air outlet and is designed for changing the direction of air flow, and the air inside the cooking chamber flows out under the action of the fan, bolometric hygrometer placed in the bracket and designed to determine the humidity of outlet air, the microcomputer to control the load on the magnetron and the fan and signal bolometric hygrometer.

On the other part, which is converted to bolometric the hygrometer, the housing has a protrusion directed toward the bolometric hygrometer to increase the speed of the air leaving the air outlet.

In another aspect of the present invention is a method of regulating the stove or furnace, which consists in the fact that (1) operate the magnetron using a microcomputer, the humidity is determined using the bolometric hygrometer and set the initial value in accordance with the output signal of the sensor, (2) calculate the basic period by use of the period for which is set for the initial sensor value reaches the output signal of the sensor according to the menu but, (3) after the calculation of the basic period with bolometric hygrometer determine the variation of the output signal of the sensor current sampling time intervals to determine whether the packaging, (4) after determining the change of the output signal determines the code is received, heating, (5) when the operation result of the determination is that the code is received, heating, carry out heat treatment up until using bolometric hygrometer will not detect the change in voltage corresponding to the temperature of the selected code, and then stop the operation of the magnetron and the fan (6) and when the result of the operation definition is not receiving code heating, determine whether the change of the output signal is a predetermined constant value, to change the primary period.

If the change of the output signal is greater than the specified constant value, the heat treatment is defined as a case with packing, and the magnetron and the fan work within the time period set longer than the period of operation.

If the change of the output signal is less than the specified constant value, the heat treatment is defined as a case without packing, and the magnetron and the fan work during the core period.

It should be understood that as p is adidome General description, as well as the subsequent detailed description are illustrative and explanatory and are intended to provide further explanation of the invention described in the claims.

Brief description of drawings

The accompanying drawings, which are included to provide further understanding of the invention and constitute a part of this description, the following examples illustrate the invention, and together with the description serve to explain the principles of the invention.

Figure 1 shows a section known hygrometer thermistor type;

figure 2 - front and top views known hygrometer thermistor type;

figure 3 - known hygrometer thermistor type;

figure 4 - block diagram representing the operation of the known method of regulating the stove or furnace with hygrometer thermistor type;

figure 5 is a graph showing the characteristics of known hygrometer thermistor type;

figure 6 is a partial section view and top view of a bolometric hygrometer in accordance with the preferred embodiment of the present invention;

7 - cut bolometric hygrometer in accordance with the preferred embodiment of the present invention;

on Fig diagram bolometric hygrometer in accordance with the preferred embodiment on the present invention;

figure 9 is a graph showing the characteristics of the bolometric hygrometer in accordance with the preferred embodiment of the present invention;

figure 10 is a partial section view representing a bolometric hygrometer of the present invention, used with a stove or oven;

on figa and 11B is a block diagram representing the operation of the method of regulation plate or oven, with a bolometric hygrometer of the present invention;

on Fig is a chart showing output signals depending on the time periods for bolometric hygrometer, when working stove or oven of the present invention;

on Fig is a chart showing output signals of the sensor depending on the temperature in the stove or furnace of the present invention;

on Fig is a chart showing output signals of the sensor depending on the use of packaging in the stove or furnace of the present invention;

on Fig is a chart showing output signals of the sensor depending on the periods of time required for heat treatment in a stove or furnace of the present invention.

The best example of carrying out the invention

Preferred embodiments of the present invention, represented in the attached drawings will be described in detail below. Figure 6 shows a partial section and the ID from above bolometric hygrometer in accordance with the preferred embodiment of the present invention.

According to Fig.6 bolometric hygrometer in accordance with the preferred embodiment of the present invention includes parts 21 and 22 of the housing to protect the components inside them, the Assembly 30 of a base and a cap for placing the work item, shielded wire 25 connected to the Assembly through the side of the hull to prevent noise.

7 shows a cut bolometric hygrometer in accordance with the preferred embodiment of the present invention.

According to Fig.7. the Assembly 30 includes a base 31 having a main indicator hole 37 to inlet water vapor through it, and the cap 32 attached to the top of the base for formation of separate cavities. The cavity is divided into the cavity 32b chamber connected with the main indicator hole 37 and formed by the partition wall 32A, and the cavity 32C, closed with respect to the main indicator hole. In the cavity 32b, with the main indicator hole 37, is bolometric sensing element 33 to determine the moisture content, and in the cavity 32C, not having a main indicator holes, is bolometric sensing element 34 for temperature compensation. Bolometric temperature-sensitive elements 33 and 34 represent the elements formed on the overall semiconductor plate 38 and which is the bolometric elements with a positive temperature coefficient, in each of which the resistance is linearly dependent on temperature change. That is, the sensing element 33 or 34 provides a linear increase in resistance, if increases its temperature, and Vice versa. Temperature-sensitive elements 33 and 34 form one circuit using pin conclusions. In the end, three pin terminal is connected to a wire extending from a shielded wire 25 passing through the base 21 and the cap 22, and is connected to a heat-sensitive elements. One of the pin findings, 35b connected with bolometric temperature-sensitive element 33 to determine the moisture content, the other pin, 35S, connected with bolometric temperature-sensitive element 34 for temperature compensation, and a third pin, 35A, connected with bolometric temperature-sensitive element 33 to determine the moisture and bolometric temperature-sensitive element 34 for temperature compensation as a General conclusion.

Below will be explained in detail the shape of the parts of the body, enclosing the Assembly.

According to Fig.6, the housing includes a cylindrical front and back parts 21 and 22, and the Assembly 30 is fixed to a certain support 23 in the cavity formed by the said parts. The cap and base, which are temperature-sensitive elements supported by the support 23 attached to the I to the parts 21 and 22 of the housing, it does not require any heating unit to ensure thermal equilibrium, as is the case in known devices. Bearing 23 rests on the ledge, made in the rear part 22 of the casing in such position that the substrate while facing the front part 21 of the housing, i.e. in the position, when the main indicator hole facing the front of the case and the front part 21 of the housing adjacent to the front surface of the rear portion of the chassis 22, as the front part 21 of the housing presses the support 23. In this case, although not shown, the front part 21 of the housing, having a smaller size than the rear part 22 of the housing presses the support 23 to the ledge to hold 23, when the front part of the housing connected to the rear part of the body. In the surface of the front part 21 of the housing proximal the forward direction, there are many additional indicator of holes 26 for the inlet of water vapor. That is, as an additional indicator of the hole 26 is turned to the main indicator hole in the base, the water vapor coming through the body, can easily enter into the Assembly, and the difference in sensitivity caused by the position of the hygrometer can be maximally reduced. Preferably, an additional indicator holes 26 were in the designs on the sites remote from the center of the front part 21 of the housing to protect the element from the directional dispersion of air containing water vapor. For example, four of the additional indicator holes 26 can be made around the circumference of the front part 21 of the housing at an angle of 90°. On the periphery of the front 21 and rear 22 of the case is made many of the mounting holes 27 for fastening the parts of the body.

In the above bolometric hygrometer air present in it water vapor enters the cavity, which is bolometric sensing element 33 to determine the moisture content through additional indicator holes 26 and the main indicator hole 37. On bolometric sensing element 33 to determine the moisture content affects the temperature of the air present in it water vapor, while at the bolometric sensing element 34 to the temperature compensation effect of the ambient air. Finally, since the air present in it water vapor has a temperature lower than the temperature of ambient air, the bolometric resistance of the sensitive element 33 to determine the moisture content is less than the bolometric resistance of the sensitive element 34 for temperature compensation, and the difference of resistances which may be used to determine the humidity.

Next will be explained in detail diagram to determine the bolometric humidity-hygrometer. On Fig diagram shows the bolometric hygrometer in accordance with the preferred embodiment of the present invention.

According Fig bolometric hygrometer in accordance with the preferred embodiment of the present invention includes bolometric sensing element 33 to determine humidity, bolometric sensing element 34 for temperature compensation, the amplifier 100 having an inverting (-) input to obtain the output voltage corresponding to the moisture content determined bolometric temperature-sensitive element 33 to determine humidity, non-inverting (+) input for receiving a predetermined reference voltage and is designed to amplify the difference between the output voltage and the reference voltage, a variable resistor VR for supplying the reference voltage at the noninverting (+) input of the amplifier and a resistor R having one end, connected to the variable resistor VR, and the other end connected to the bolometric temperature-sensitive element 34 for temperature compensation. Bolometric hygrometer has a bridge circuit, in which the bolometric sensing element 33 to determine the moisture content is placed opposite the resistor is R, and bolometric sensing element 34 for temperature compensation is placed opposite to the variable resistor VR. Work bolometric hygrometer having the above-mentioned circuit will be explained in detail below.

Figure 9 presents a graph showing the characteristics of the bolometric hygrometer in accordance with the preferred embodiment of the present invention, in which the ordinate axis represents the resistance, while the x-axis is the temperature.

From Fig.9 it can be understood that the scheme bolometric hygrometer is the change in resistance is linearly dependent on temperature change. This is due to the use of bolometric elements with a positive temperature coefficient in bolometric the hygrometer of the present invention, which contributes to easy forecasting resistance depending on temperature change, because, in contrast to the known thermistor element, the resistance change is linearly dependent on temperature changes.

Next will be explained in detail stove or oven having the above-mentioned bolometric hygrometer. Figure 10 presents a partial section view showing a bolometric hygrometer of the present invention, used with a stove or oven.

According to figure 10 stove or oven according to the present invention which incorporates both the housing 41, having a cooking chamber (not shown) with a cavity for accommodation of food and the separation of electrical equipment (not shown) for mounting various devices. In the Department of electrical equipment are the magnetron (not shown), providing heat for heating the food, and the fan (not shown) for circulating air inside the cooking chamber. There is also a microcomputer (not shown) for regulating the load on the magnetron and the fan and signal bolometric hygrometer. On one side of the housing 41 is the vent hole 42 to release the air from the cooking chamber to the outside through the fan, and at the end of the vent holes is l-shaped bracket 50 for changing the direction of air flow and retention of bolometric hygrometer. The bracket 50 is a plate bent in the form of the letter "G" to reject the outgoing air stream at an angle of 90° when interacting with one of the sides of the body 41, on which is placed a bolometric hygrometer, and with the front part 21 of the casing of the latter, acting on the flow path. Accordingly, an additional indicator of the holes 26 in the front part 21 of the housing bolometric hygrometer located on the surface facing the air outlet of the bracket 50. Consequently, the flow of outlet air mills is tsya activedayton through the bracket 50, when the exhaust air passes through the vent hole 42, contributing to the gradual introduction of the outflowing air through additional indicator holes 26, which increases the sensitivity of the sensor. For higher sensitivity of the sensor preferably, the protrusion 43 was performed on the body 41 toward the front of the case bolometric hygrometer on the plot, opposite referred to the front, in order to reduce the cross-section of the road which passes the exhaust air, which increases the sensitivity of the sensor, since the flow velocity becomes higher. Exhaust air is admitted into the Assembly through an additional indicator of the holes 26 and the main indicator hole affects bolometric sensing element to determine the bolometric humidity and a temperature sensitive element for temperature compensation. In accordance with this, the microcomputer determines the moisture content by difference of resistance, to establish a degree of heat treatment and to adjust the magnetron, etc.

Next will be explained the method for controlling plate or oven, with a bolometric hygrometer. On figa and 11B presents a flowchart showing the operation of the method of regulation plate or oven, with a bolometric hygrometer present ademu the invention, and Fig presents a graph showing the output signals bolometric hygrometer depending on time periods bolometric hygrometer, when the stove or oven of the present invention is in operation, while the axis of ordinates represents the outputs of the hygrometer and the axis of abscissa - time periods. Under the x-axis shows the phase adjustment and the working condition of the magnetron and the fan.

According figa, 11B and 12, when the user selects the mode of heat treatment, the microcomputer supplies power to the fan and provides pre-purge period S1 for cleaning the cooking chamber (S100). Then determine the end of blowdown (S110). If the result of the operation definition (S110) is the discovery that the purge has not been completed, the purge period is increased by 1 second (S120), and the process returns to operation of the purge (S100) and perform the desired operation. If the result of the operation definition (S110) is the discovery that the purge is completed, the microcomputer supplies power to the magnetron for generating microwaves and results in continuous action fan for heat dissipation (S130). Then simultaneously with turning on the magnetron output signal of the sensor bolometric hygrometer installed in the original position, which can be explained in detail as follows with the links on Fig.

First, the air is released from the cooking chamber, is fed through a main detector aperture and an additional detector holes on the bolometric sensing element for determining humidity, and bolometric sensing element to determine the moisture content produces a voltage V100, due to the resistance corresponding to the temperature of the water vapor present in the air. This voltage serves to the inverting (-) input of amplifier 100. In this case, the variable resistor VR connected in parallel with the bolometric temperature-sensitive element for measuring humidity, changes its resistance up until the reference voltage V200 does not become equal to the output voltage, which is served on the non-inverting (+) input of amplifier 100. Then the amplifier increases the voltage equal to the difference between the reference voltage V200 received at the non-inverting input, and the output voltage V100 received at the inverting input, i.e. the output value of the sensor signal Vs. In the end, the output value of the sensor signal Vs represents the change in the voltage from amplifier 100, which you can see the humidity in the cooking chamber. If the reference voltage becomes the same as the output voltage bolometric temperature-sensitive element 33 to determine wet the tee in accordance with the setting of the variable resistor VR, the amplifier 100 is not a difference of voltage that sets the sensor to its original position. This condition is called zero, and the sensor output signal Vs at this time is the initial value Vref.

In accordance with the above-described process is determined (S140) completion of installation of zero. If the result of the operation definition (S140) is the discovery that the zero adjustment is completed, determine (S150)whether the setting of the output signal Vs from the amplifier 100 initial value Vref. If the result of the operation definition (S150) is detected as the sensor output Vs is set to the initial value Vref, it is determined (S160), is whether the sensor output voltage changes ΔV according to the menu in relation to the initial value. That is, since a change in the voltage set in relation to the initial value of the sensor Vref for each menu, which should be selected by the user, determine, reaches if the sensor output voltage changes after zero. Then, if the result of the operation definition (S160) is detected as the sensor output signal Vs reaches a voltage change ΔV according to the menu in relation to the initial value, then calculate the period T1 required to reach a voltage change ΔV, to you is islice (S170), the main period T2. The main work period calculated as follows:

T2=T1×α,

where α quantitative means compensating factor.

Meanwhile, if the sensor output Vs is not installed on the initial value, determine (S180) after a predetermined period of time S2 after was included magnetron. If the result of the operation definition (S180) is the discovery that after turning on the magnetron predefined work period S2 has expired, then the sensor output Vs is installed in this time equal to the initial value Vref (S190), and the ascending current change voltage ΔV is increased by 1 second (S200). Then define (S210), if the current reaches the change of voltage changes, voltage ΔV according to the menu selected by the user, provided that the time of increase of the current changes the voltage increased by 1 second. If the result of the operation definition is the detection of the current change voltage ΔV reaches a voltage change ΔV according to the menu in relation to the initial value, calculate the period of the increase of the current time T1 to calculate the basic work period T2 (S210). In contrast, if the result of the operation definition (S210) is the detection of the current change in the voltage does not have access to the calls for change voltage Δ V according to the menu in relation to the initial value, the process returns to operation (S200) to increase the period of increasing current change voltage for 1 second and perform the operation (S200). Then, after the calculation of the basic period of operation using bolometric hygrometer in a pre-selected time intervals to determine the changes of the output signal Vwrap sensor to determine whether packaging (S220). As the selected time interval, use the period of rotation of the rotary table in the cooking chamber. For example, to determine the change of the output signal the output signal of the sensor depends on each revolution of the rotary table and calculate the difference between the output signals of the sensor. Then, after determining the change of the output signal Vwrap, define the application code to the heat produced by the user (S230). If the result of the operation definition (S230) is the confirmation of the application by the user code heat, then set the voltage changes ΔV1, corresponding to the temperature of food (S270). After that determine the achievement of the output sensor signal Vs obtained using bolometric hygrometer, voltage ΔV1 (S280), and if the result of the operation of determining determines that the sensor output signal Vs has reached the change voltage ΔV1, magnetron and the fan is turned off to complete heat treatment (S290).

On Fig presents a graph showing the dependence of the output signals of the sensor from the temperature of the food in the stove or furnace of the present invention. The ordinate represents the output signals of the sensor, and the abscissa is the temperature.

From Fig follows that stoves or furnaces of the present invention the temperature of the food and the voltage changes agreed in the ratio of 1:1, while the temperature of the food and the voltage change associated linear dependence within a certain area. Therefore, if the user code applies heat to heat food when installed user-selectable temperature, the microcomputer stores the voltage change ΔV1 corresponding to the set temperature, and terminated by heat treatment, if the sensor output signal Vs reaches the above-mentioned voltage. Thus, stove or furnace of the present invention allows the user to change the set temperature in a wide range, and since the voltage bolometric hygrometer mounted on the heating temperature, is a linear function, can be more accurately provided the degree of heating of food. If the user code does not apply heat, to determine covered any food wrapper, compare the changes of the output signal of the sensor Vwrap obtained in the preliminary step is correctly selected time intervals, with a given constant 'k' (S240).

On Fig presents a graph showing the output signals of the sensor depending on the use of packaging in the stove or furnace of the present invention, while the ordinate represents the output signals of the sensor, and the abscissa is time.

From Fig follows that in the case of food covered by a wrapper, the sensor output Vs is lower than in the case when the food is not covered by the wrap, and the enlarged image, it follows that, when food is covered by a wrapper, the change of the output signal of the sensor Vs within a certain area is great. Therefore, the presence of a package (wrapper) can be determined by the output signals of the sensor at fixed intervals and compared the changes of the output signal Vwrap, the difference between the output signals of the sensor with a preset constant value. That is, when the change of the output signal is constant 'k', I think that the packaging is present, and when the change of the output signal is less than the constant 'k', I believe that the package is missing.

On Fig presents a graph showing the output signals of the sensor depending on the required periods of heat treatment, while the ordinate represents the output signals of the sensor, and the abscissa is time.

From Fig follows that the presence of a package changes required period of heat treatment. That is, when the UPA is transportation there, need some longer period of heat treatment than in the case when there is no packaging as packaging prevents the passage of microwaves from the magnetron. Therefore, when the change of the output signal Vwrap more constant 'k', heat treatment carried out for the new main work period TK, slightly longer than during the main period T2, previously installed (S250). Then the magnetron and the fan off to finish heat treatment (S290). On the other hand, if the change of the output signal Vwrap less constant 'k', a heat treatment is carried out during the main period T2, previously installed (S260), and the magnetron and the fan is also turned off to complete heat treatment (S290).

For professionals it is obvious that it is possible to make various modifications and changes in the bolometric hygrometer, stove or furnace with bolometric a hygrometer and a method for controlling plate or a furnace according to the present invention without deviation from the principles and scope of the invention. Thus, it is assumed that the present invention covers the modifications and modifications of this invention provided that they are within the scope of the applied claims and equivalent signs.

Industrial applicability

Bolometric hygrometer on the right is briteney can determine the humidity more accurately in comparison with the known hygrometer thermistor type by using the difference of resistances, due to the temperature difference between the water vapor and air through two bolometric temperature-sensitive elements in which the resistance is linearly dependent on temperature changes.

For thermal equilibrium between the temperature-sensitive elements, there is no need to attach by welding additional thermal unit to the chassis. Therefore, may improve the performance because the device is simple in construction and in manufacturing.

Stove or oven with bolometric the hygrometer according to the present invention can more accurately determine the humidity of the outlet air by placing the bolometric hygrometer on the bracket, which activates the flow of air leaving the cooking chamber.

Method for controlling plate or a furnace according to the present invention can provide food that is prepared at the optimum for the user conditions, because the installation period of the heat treatment may be changed when using the food in the package and can be installed desirable for the user, the heating temperature due to the use of bolometric hygrometer of the present invention, having a linear output signal.

1. Bolometric hygrometer, comprising a housing, the base having a main indicator intake in anago pair, the cap is placed on top of the base for the formation of cavities, bolometric sensing element to determine the moisture having a resistance that changes depending on the temperature in the cavity, communicating with the main indicator hole, bolometric temperature-sensitive element for temperature compensation having a resistance that changes depending on the temperature in the cavity, not communicating with the main indicator hole, and shielded wire connected to the bolometric temperature-sensitive elements, for transmitting signals and prevent noise.

2. Bolometric hygrometer according to claim 1, characterized in that the bolometric sensing elements formed on a semiconductor wafer and are bolometric temperature-sensitive elements with a positive temperature coefficient, each of which has a resistance that is linearly dependent on temperature changes.

3. Bolometric hygrometer according to claim 2, characterized in that the bolometric temperature-sensitive elements are connected with a shielded cable and three pin pins passing through the base so that one element is connected with one pin output, respectively, and the remaining pin is connected to both elements.

4. Bol the electrical hygrometer according to claim 3, characterized in that the housing includes a rear portion having a support for maintaining the cap and base, this base is located on the side of the open surface, and the front part, the size of which is smaller compared to the back to clamp and fix the foot.

5. Bolometric hygrometer according to claim 4, characterized in that the front part has many additional indicator of holes formed in the surface facing to the base in the direction of forward inlet water vapor.

6. Bolometric hygrometer according to claim 5, characterized in that the indicator holes are made in areas remote from the center of the front part.

7. Bolometric hygrometer according to claim 1, characterized in that it further comprises a circuit including an amplifier having an inverting (-) input to obtain the output voltage corresponding to the humidity set bolometric temperature-sensitive element for determination of moisture, non-inverting (+) input for receiving a predetermined reference voltage and is designed to amplify the difference between the output voltage and the reference voltage, a variable resistor for supplying the reference voltage at the noninverting (+) input of the amplifier and a resistor having one end connected to the variable resistor, and the other end connected to volumetrically the heat-sensitive element for temperature compensation.

8. Bolometric hygrometer according to claim 7, characterized in that it is formed of a bridge circuit by combining bolometric temperature-sensitive element for measuring humidity with a resistor and bolometric temperature-sensitive element for temperature compensation with a variable resistor.

9. Stove or oven with bolometric the hygrometer containing the cooking chamber in the housing plate or oven having a cavity for placement of food, magnetron, providing heat for heating food, a fan for circulating air inside the cooking chamber, an l-shaped bracket for changing the direction of air flow, located at the end of the vent holes, and the air inside the cooking chamber flows out under the action of the fan, bolometric hygrometer located in the bracket, to determine the humidity of the air leaving the air outlet, and a microcomputer to control the load on the magnetron and the fan and signal bolometric hygrometer.

10. Stove or oven according to claim 9, characterized in that the housing has a ledge on the side facing the bolometric the hygrometer directed to the bolometric hygrometer to increase the flow velocity of the air leaving the air outlet.

11. Method for controlling plate or a furnace, which consists in the om, that

(1) operate the magnetron using a microcomputer, the humidity is determined using the bolometric hygrometer and set the initial value for the sensor in accordance with the output signal of the sensor,

(2) calculate the basic period by use of the period for which is set for the initial sensor value reaches the output signal of the sensor according to the menu,

(3) after the calculation of the basic period with bolometric hygrometer determine the variation of the output signal of the sensor in the current selected time intervals to determine whether the packaging,

(4) after determining the change of the output signal determines the code is received, heating,

(5) if the result of the operation definition is the detection of the fact that the code of heating is obtained, then perform a heat treatment up until using bolometric hygrometer does not detect the change in voltage corresponding to the temperature of the selected code, and then stop the operation of the magnetron and the fan,

(6) if the result of the operation definition is the detection of the fact that the code of heating is not obtained, then determine whether the change of the output signal is a preset constant value, to change the primary period.

12. The method according to claim 11, characterized in that in the case when the change of the output signal exceeds a preset constant value, the heat treatment is defined as the case with the packaging and ensure the operation of the magnetron and the fan over a period longer than the period of operation.

13. The method according to claim 11, characterized in that in the case when the change of the output signal is less than a predetermined constant value, the heat treatment is defined as a case without packaging and ensure the operation of the magnetron and the fan only during the main period of work.



 

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