Timer for refrigerating devices

FIELD: refrigeration automatics.

SUBSTANCE: timer comprises power source, time counter, heater, detector of termination of defrosting, compressor, three-contact relay, two single-period rectifiers, and first and second quenching elements. The common output of the time counter is connected with the second pole of the power source. The counting input of the time counter is connected to the second unmovable terminal of the relay through the detector of termination of defrosting and with the first pole of the power source through the heater. The output of the time counter is connected with the unmovable contacts of the relay through three chains defined by the winding and threshold unit, first rectifier and first quenching unit, second rectifier and second quenching unit.

EFFECT: reduced sizes.

1 dwg

 

The invention relates to the field of automation and can be used for occasional inclusions of Executive automation devices AC, for example, cooling devices.

Known timer (patent RF №2167463, etc. 03.04.2000 g)containing a power source, a timer, heater, sensor, defrost termination, compressor, three-prong relay, the movable contact of which is connected to the second pole of the power source, the counting input of the counter time through the heater is connected to the second stationary contact of the relay and through the sensor defrost termination is connected to the first pole of the power source, the total output of the time counter connected to the first stationary contact of the relay and through the compressor is connected to the first pole of the power source, and the output from the first output winding of the relay, the second output winding of the relay connected to the second pole of the power source via the included controlling circuit representing serially connected threshold element, the rectifier and the first ballast resistor, the input rectifier connected between the stationary switching contacts three electromagnetic relays via a second ballast resistor.

The resistors in the famous diagram of the timer are absorbing elements and are designed to absorb the voltage source feed is. While the main function of the second ballast resistor - accumulation of energy at the output of the rectifier is sufficient to relay.

In the operation of the relay (switching its movable contact from position “a” to position “b”) parallel to the second ballast resistor connects the first ballast resistor whose main function is to provide in conjunction with a second ballast resistor hold the relay in srabotanno condition.

A disadvantage of the known circuit timer are significant energy losses at the output of the rectifier associated with the fact that when the movable contact of the relay in the initial position “a” (before the relay), the first ballast resistor is connected in parallel to the rectifier, i.e. the first ballast resistor bypasses the rectifier. Through the first ballast resistor current leakage, power supply rectifier. The lower the resistance value of the first ballast resistor, the greater the leakage current flowing through this resistor.

With increasing resistance values of the first ballast resistor reduces the ability to hold a three-prong relay in srabotanno state (position “b” of the rolling contact of the relay). In position “b” of the rolling contact of the relay of the first and second ballast R is shistory included in parallel, therefore, when significant resistance values of the first ballast resistor voltage at the rectifier output may not be sufficient to hold the relay.

Thus, the resistance value of the first ballast resistor depends on the resistance values of the second ballast resistor and the magnitude of current necessary to keep the relay. Choosing each of these circuit elements are dependent on each other and constrained to each other.

In addition, normal operation and serviceability known timer are provided only if the rectifier feeds the relay coil, made a full-wave, i.e. works in each half-period of the mains voltage. The connection of the second input of the rectifier with the first stationary contact of the relay is required to provide a full-wave mode of operation of the rectifier.

When used in the circuit of timer defrost full-wave rectifier arrangement of the restraining elements with respect to the circuit elements, in particular rectifier, strictly defined. The second restraining element must be included between the first input of the rectifier and the second stationary contact of the relay, and the first absorbing element must be included between the first input of the rectifier and the second pole of the power source. Only when the ACOM location of the restraining elements, each of them will execute its function namely, the second restraining element will ensure that the voltage level at the output of the rectifier required for operation of the relay, and the first restraining element together with the first - will hold the relay in srabotanno condition.

At another location of the restraining elements relative to the rectifier operation of the timer is broken, because of the restraining elements will not be in this case to perform its functions - ensure operation of the relay and hold it in srabotanno condition.

Thus, a well-known timer will be workable, and each of the restraining element to perform its function only at this location, as indicated in the formula and description timer patent No. 2167463.

Strict predetermination location of circuit elements reduces the possibility of changing the dimensions of the circuit timer, reduces the possibility of manoeuvre in relation to the dimensions of the timer if the timer should be built in already. In addition, the use of a full-wave rectifier determines the significant dimensions of known construction timer.

In addition, the timer can be used in a refrigerating device, an electric circuit for connecting the common output of the time counter to a stationary contact of the electromagnetic relay, for example, in the freezers “STINOL”-106, 112.

The technical problem solved by the invention, is expanding Arsenal of technical means related to the timers of the refrigeration device, reduced electricity consumption by reducing its losses in the process timer, to increase the degree of universality of the timer; and - minimize size and greater maneuverability in relation to the dimensions of the timer.

The problem is solved in that the timer refrigeration devices on half-wave rectifiers, containing a power source, a timer, heater, sensor, defrost termination, the compressor, the first and second half-wave rectifier, the first and second restraining elements, three-prong relay, the movable contact of which is connected to the second pole of the power source; the total output of the time counter is connected with the second pole of the power source; MF the private input of the time counter through the sensor defrost termination connected to the second stationary contact of the relay and through the heater is connected to the first pole of the power source; the output of the time counter associated with the second stationary contact of the relay through two series-connected circuit formed on one side (first circuit), a relay coil and a threshold element and, on the other hand (second circuit), the first rectifier and the first absorbing element; the output of the counter associated with the first stationary contact of the relay through two series-connected circuit formed on one side (first circuit), a relay coil and a threshold element and, on the other hand (third circuit), the second rectifier and the second restraining element.

When the solution of the problem was the problem of using two half-wave rectifier instead of one full wave, to create a functional timer, the construction of which is minimized, has a high degree of maneuverability dimensions applicable in the circuits of the refrigeration device, in which the total output of the time counter is connected to the moving contact of the relay.

This option is provided by the proposed design of the timer.

The timer included in the system defrost the refrigerator.

When the supply voltage is movable relay contact is shorted to the first stationary contact.

From the second pole of the power source current through the timer and the heater is supplied to the first pole of the power source, enabling a counter ASU is neither, which starts to count the operating time of the compressor is proportional to the number of fluctuations of the supply voltage (or internal clock). This heater does not work, since its internal resistance is considerably less than the internal resistance of the meter time. At the same time the current through normally closed first fixed contact “a” of the relay goes to the compressor and then to the first pole of the power source. The compressor runs, the time counter counts the operating time of the compressor. After dialing the cold closed contact sensor defrost termination, the current begins to flow through the circuit from the second pole of the power source through the timer, the relay coil, the threshold element, the first rectifier, the first restraining element, the sensor defrost heater to the first pole of the power source. If this heater is not working, because the relay contacts are in position “a”, which operates the compressor. When electric current flows through the first absorbing element begins the process of transition of the output voltage of the first rectifier. After reaching the voltage at the output of the first rectifier values sufficient for reliable operation of the relay opens the threshold element and provides the supply voltage to the second contact, winding of the relay. The relay and switch to the Tachov in position “b” will occur upon the submission to the first coil winding relay the necessary voltages from the output of the time counter, the corresponding time interval.

When the contact switch is in position “b”, because the contact sensor defrost closed, turns on the heater, the defrost refrigerator. When this current flows through the circuit from the second pole of the power source through the closed contacts of the sensor defrost heater to the first pole of the power source.

At the same time through the second absorbing element voltage is applied to the inputs of the second rectifier, the output of which sets the output voltage. When the compressor is not running, and the current flows through the circuit: the second pole of the power source, the timer relay coil, the threshold element, a second rectifier, the second restraining element, the compressor, the first pole of the power source. When the relay contacts in the position “b” of the first rectifier and the first restraining element does not work, because the whole chain, formed by a timer, a relay coil, a threshold element, the first restraining element and the first rectifier is shorted closed contacts of the sensor defrost termination. When the contacts in position “b” of the time counter stops working because its counting input no signal.

When defrosting has occurred, when the set temperature is reached, the contact sensor defrost termination is open. Through the time counter ID is t current (chain: the second pole of the power source, the time counter, the heater, the first pole of the power source) and is counting pause after defrost, the compressor, and heater do not work because of the internal resistance of the meter time is significantly greater than the resistance of compressor and heater.

At the end of the pause time counter goes to its original state, the tension is removed from the first output winding of the relay, and the relay contacts switch in position “a”, the cycle repeats.

Thus, when using the present invention would be employed in the required (specified) timer mode in General.

When this does not matter in what sequence relative to the fixed contacts of the relay and the circuit of the series-connected winding of the relay, and the threshold control is enabled rectifiers and absorbing elements. At any appropriate location of the restraining elements and rectifiers with respect to stationary contacts of the relay and the circuit of the series-connected winding of the relay and the threshold element current in the corresponding periods of the timer will always be leaking or through the first or the second absorbing elements. In any period timer and the half-period of the mains voltage or the first or the second absorbing elements will perform its function of clearing unnecessary tension.

When used is the so called half-wave rectifiers got the opportunity to vary the relative position of the rectifier and a quenching element. This is important from the point of view of the constructive execution of the timer when the hard constraints of the device. The possibility of this maneuver allows you to achieve a more dense layout of the timer, especially considering that the quenching elements (especially if their roles are resistors) must be spaced relative to each other from the point of view of compliance with security requirements.

Thus, the use in the circuit of the timer instead of a single full-wave rectifier of the two half-wave will provide the possibility of varying the locations of circuit elements relative to each other, allowing substantially in compliance with all safety requirements more tightly positioning the elements relative to each other, providing additional opportunities to reduce the dimensions of the timer.

The introduction of a second rectifier has not led to an increase of the dimensions of the timer is compared with the prototype, since the dimensions of the rectifier is significantly less than the dimensions of the restraining elements, as well as the dimensions of the half-wave rectifier is less than its dimensions.

Since both rectifier operate alternately, the currents through both of the restraining element flow also alternately with a corresponding position of the rolling contact (“a” or “b”), causes no loss of energy at the input to the each of the rectifier. The choice of the value of the basic characteristics of each of the restraining element is caused solely by the need to ensure operation of the relay and hold it in srabotanno condition. The choice is made for each of the restraining element independently regardless of the settings of the other of the restraining element. I.e. each rectifier and all other circuit elements of the timer is in optimum condition without unnecessary loss of energy.

As quenching can be selected such elements, which provide damping excessive voltage by its resistance (active or reactive). The value of the energy accumulated at the output of the rectifier, is inversely proportional to the magnitude of this resistance.

The magnitude of this resistance is the main characteristic of the absorbing element.

The choice of the value of the basic characteristics of the restraining elements is determined only necessary response time three-prong relay and voltage magnitude at which is provided a holding relay in srabotanno condition. The choice of the values of the basic characteristics of both the quenching of the elements is determined only by the above conditions and does not depend on the value of the basic characteristics of the other of the restraining element, because when the timer both quenching element do not affect each other.

Thus, reduced energy losses during operation of the timer, and also ensures its versatility due to the fact that the choice of circuit elements (first and second restraining elements) is determined only by their functions and independent from one another, which allows for fewer restrictions to change some characteristics of the timer (for example, the time delay relay after issuing a signal meter or consumption of timer mode operation of the compressor depending on the conditions of its use.

The proposed construction of the timer is designed for use in a refrigerating device, an electric circuit for connecting the common output of the time counter to the rolling contact of the electromagnetic relay, for example, refrigerators "DAEWOO", model FR-3501, 3502, 3503, FR-3801, 3802, 3803.

The prior art is not revealed structures timers, characterized by the claimed combination of features, therefore, the present invention meets the patentability criteria of “novelty.”

The claimed combination of features of the invention, which achieves the task, leads to the conclusion that the claimed invention meets the patentability criterion of “inventive step”.

The drawing shows a block diagram of the timer. Half, which contains:

1. The time counter.

2. Three electromagnetic relays.

3. The threshold element.

4. The rectifier 1 power.

5. The rectifier 2 power.

6. Resistor 1.

7. The resistor 2.

8. Switching the three-prong contacts of the electromagnetic relay.

9. 10, 11. The elements of the periodic inclusion of the managed device; (9 - heater; 10 - sensor defrost termination; 11 - compressor).

12. The first pole of the power source.

13. The second pole of the power source.

The movable contact of the relay 2 is connected to the second pole of the power source 13. The counting input of counter 1 time through the sensor 10 defrost termination connected to the second stationary contact of the relay 2 and through the heater 9 is connected to the first pole 12 to the power source. The total output of counter 1 time connected with a movable contact 8 of relay 2. The output of counter 1 is connected to the second stationary contact of the relay b through series-connected: the relay coil 2, the threshold element 3, the rectifier 4 and the resistor 6. In addition, the output of counter 1 is connected with the first fixed contact “a” of the relay through the series-connected: the relay coil 2, the threshold element 3, a second rectifier 5 and resistor 7. The rectifiers 4 and 5 are designed to supply winding of the relay 2; resistors 6 and 7 perform the function of absorbing elements. The rectifiers 4 and 5 are made of unidirectional and provide the current flow: the rectifier 4 - from the second pole 13 of the power source, counter 1 time, the relay coil 2, the threshold element 3, the rectifier 4, the resistor 6, the sensor 10, the heater 9 to the first pole 12 of the power source; a rectifier 5 from the second pole 13 of the power source, counter 1 time, the relay coil 2, the threshold element 3, the resistor 7, the rectifier 5, the compressor 11, the first pole 12 to the power source.

The device operates as follows.

The timer included in the system defrost the refrigerator.

When the supply voltage is movable relay contact 2 is in the normally-closed state "and" switching contacts 8.

From the second pole 13 of the power supply current in timer 1 and the heater 9, is supplied to the first pole 12 of the power supply, ensuring that the time counter 1 starts to count the operating time of the compressor 1. At the same time the current through normally closed first fixed contact “a” of the relay goes to the compressor 11 and further to the first pole 12 to the power source. The compressor 11 operates, the counter 1 counts the operating time of the compressor 11. After dialing the cold closed contacts of the sensor 10 defrost termination, the current begins to flow through the circuit from the second pole 13 of the power source through the meter 1, the winding of relay 2, the threshold element 3, the first restraining element is a resistor 6, a first rectifier 4, the sensor 10, the heater 9 to ground the pole 12 to the power source.

After reaching the voltage at the output of the rectifier 4 values sufficient for reliable operation of the relay opens the threshold element 3 and provides the supply voltage to the second contact, winding of relay 2. The relay 2 and relay contacts in the position “b” will occur upon the submission to the first winding of the relay coil 2 is required voltages from the output of counter 1 time corresponding to a time interval.

When the contact switch is in position “b” the current flows through the circuit from the second pole of the power source through the closed contacts of the sensor defrost heater to the first pole of the power source; the process of defrosting the refrigerator.

At the same time through the second absorbing element is a resistor 7 voltage is applied to the inputs of the rectifier 5, the output of which sets the output voltage. The current flows through the circuit: the second pole 13 of the power source, counter 1, the winding of relay 2, the threshold element 3, the rectifier 5, the resistor 7, the compressor, the first pole 12 to the power source.

When defrosting has occurred, when the set temperature is reached, the contacts of the sensor 10 is open. Over the counter 1 is current and is counting pause after defrost, the compressor 11 and the heater 9 is not working.

At the end of the pause counter 1 enters the initial state, the tension is removed from the first turn is Yes winding of relay 2, and the contacts of the relay 2 is switched to position “a”, the cycle repeats.

The timer refrigeration devices on half-wave rectifiers, containing a power source, a timer, heater, sensor, defrost termination, the compressor, the first and second rectifiers, first and second restraining elements, three-prong relay, the movable contact of which is connected to the second pole of the power source, the total output of the time counter is connected with the second pole of the power source, the counting input of the counter time through the sensor defrost termination connected to the second stationary contact of the relay and through the heater is connected to the first pole of the power source, the output of the time counter associated with the second stationary contact of the relay through two series-connected circuit formed on one side (first circuit) is connected in series with the relay coil and the threshold element, and on the other side (the second circuit) is connected to the first rectifier and the first restraining element, the output of the counter associated with the first stationary contact of the relay through two series-connected circuit formed on one side (first circuit) is connected in series with the relay coil and the threshold element, and on the other hand (third circuit) is connected in series with a second rectifier and a second quenching is lamenta.



 

Same patents:

FIELD: refrigerator automatics.

SUBSTANCE: timer has power source, time counter, heater, defrosting pickup, compressor, three-contact relay, two rectifiers, and first and second quenching members. The common lead of the time counter is connected with the movable contact of the three-contact electromagnetic relay. The defrosting pickup is connected between the inlet of the time counter and the second unmovable contact of the relay. The heater is connected between the input of the time counter and the first pole of the power source. The outputs of the second rectifier are connected with the movable contact of the relay and first movable contact of the relay through the second quenching member.

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FIELD: automation; periodic turn-on of actuating mechanisms of ac automatic-control devices.

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EFFECT: simplifying and improving cooling unit reliability.

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EFFECT: minimum power consumed for ice removal from fringe surface.

49 cl, 35 dwg

FIELD: refrigerator automatics.

SUBSTANCE: timer has power source, time counter, heater, defrosting pickup, compressor, three-contact relay, two rectifiers, and first and second quenching members. The common lead of the time counter is connected with the movable contact of the three-contact electromagnetic relay. The defrosting pickup is connected between the inlet of the time counter and the second unmovable contact of the relay. The heater is connected between the input of the time counter and the first pole of the power source. The outputs of the second rectifier are connected with the movable contact of the relay and first movable contact of the relay through the second quenching member.

EFFECT: reduced power consumption and enhanced design.

1 dwg

FIELD: refrigeration automatics.

SUBSTANCE: timer comprises power source, time counter, heater, detector of termination of defrosting, compressor, three-contact relay, two single-period rectifiers, and first and second quenching elements. The common output of the time counter is connected with the second pole of the power source. The counting input of the time counter is connected to the second unmovable terminal of the relay through the detector of termination of defrosting and with the first pole of the power source through the heater. The output of the time counter is connected with the unmovable contacts of the relay through three chains defined by the winding and threshold unit, first rectifier and first quenching unit, second rectifier and second quenching unit.

EFFECT: reduced sizes.

1 dwg

Timer // 2353996

FIELD: physics.

SUBSTANCE: timer comprises power supply source, time counter, heater, detector of defrosting completion, compressor, rectifier, quenching element, voltage limiter, three-pin electromagnet relay, movable contact of which is connected to the second pole of power supply source; common lead of time counter is connected to the first fixed relay contact and via compressor - to the first pole of power supply source; counter inlet of time counter via heater is connected to the second fixed relay contact and via detector of defrosting completion - to the first pole of power supply source; outlet of time counter is connected to the first lead of relay winding, the second lead of which via circuit of serially connected rectifier and quenching element is connected to the second fixed relay contact; common point of the second lead of relay winding and circuit formed by serially connected rectifier and quenching element is connected to common lead of time counter via voltage limiter.

EFFECT: increased reliability of operation.

1 dwg

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