Refrigerator with temperature range display

FIELD: refrigeration equipment, particularly provided with arrangements or mounting of control or safety devices.

SUBSTANCE: refrigerator comprising at least one cooling chamber defined by housing and door thereof. Temperature inside the cooling chamber varies within a certain range in dependence of location and time. The cooling chamber comprises a number of areas in which above local range of temperature fluctuations in dependence of location and time is less than common range of temperature fluctuations of cooling chamber as a whole. Display, which indicates representative data concerning above temperature fluctuations in at least one cooling chamber area is also provided.

EFFECT: possibility to store different food products in above cooling chamber in optimal storage conditions.

17 cl, 8 dwg

 

The technical field

This invention relates to a refrigerator having at least one limited case and the refrigerating chamber door, in all of which the temperature varies in a certain range depending on location and time.

The level of technology

The variation of temperature with time is mainly determined by the intermittent mode of operation of the refrigerating machine of this refrigerator, and range of temperature fluctuations depending on the space is determined by the fact that the cooling chamber is cooled, usually only on one side, and the heat can penetrate into it from all directions through dispatching the case though as the insulation is not the same everywhere. It follows that, if countermeasures are not taken, the gradient of the temperature in the refrigerating chamber is typically directed from the relatively high temperatures in the upper part of the refrigerating chamber near the door to the lower temperatures in the lower part near the rear of the machine. Some modern refrigerators, however, are equipped with digital temperature indicator, which shows the temperature in the refrigerating chamber, but the user is not able to determine the area of the refrigerating chamber is shown the temperature and what are the possible deviation of the temperature from the displayed value upwards Il is decreasing in other parts of the refrigerating chamber.

Such differences of temperature to a certain extent desirable, because the optimal storage temperature is not the same for all products. However, there may be serious problems if the products are contaminated with microorganisms, such as Salmonella or Listeria, be stored at the wrong temperature. In particular, in relation to Listeria, which in recent years has caused cases of the disease in different European countries, it is known that it can grow at refrigerator temperatures, so it is necessary to provide a sufficiently low temperature storage products, which potentially can contain these microorganisms.

To do this in conventional refrigerators, the user is difficult, because the temperature distribution inside the refrigerator compartment is not known. The manufacturer of this fridge, but, maybe, in the corresponding operating instructions to advise which products in a typical set point of thermostat of the refrigerator in any parts of the camera should be stored. But as usual when using the refrigerator do not need to look in the instruction manual, it is likely that this instruction will not be taken into account by the users and will not be realized.

But products do not contain dangerous microorganisms that can be stored is e under optimal conditions and therefore it is premature to lose quality or deteriorate.

Disclosure of inventions

The objective of the invention is to create a refrigerator that will help the user to store different products in total refrigeration chamber at the optimum for different storage conditions.

This problem is solved by the fact that inside of the refrigerating chamber is allocated at least one area in which the local variation of temperature depending on the time and place is smaller than the total range of temperature fluctuations depending on the time and place for the entire refrigerating chamber, and this area is supplied by a representative indicator for indication of the temperature range, typical of this area.

In the simplest case, this indication may be a numerical temperature value, in particular, is the average temperature in this area, or upper and lower limits of the temperature interval. More user-friendly option in which the instruction tells you what products are recommended to be stored in this area. These data can be presented in text form or in the form of pictograms. The latter method is preferable, because there is no need to adjust the refrigerator to the language of the potential user.

To facilitate separation of the various products in the corresponding areas of the refrigerating chamber, the indicator prefer is Ino should be placed in the refrigerating chamber geographically close to the area, to which it belongs. Alternatively or additionally, the indicator may also be placed on the front wall of the cooling body, so that it was possible to determine to which region it belongs.

The breakdown of the refrigerating chamber on the field can be performed in the horizontal direction, when the cooling chamber is divided into a first group consisting of one or more close to the door, relatively warm areas, and a second group consisting of one or more remote from the door relative to colder areas. Vertical partitioning boundary between areas can serve as located in the refrigerating chamber of the regiment.

In principle, it is possible to indicator a permanent message, for example in the form of inscriptions. However, it is preferable that the indicator could display changing information corresponding to the actual temperature conditions in the refrigerator, taking place at this time.

One way to implement such a correspondence is to associate an indicator with a sensor measuring the temperature in this area. How such a connection can be in principle any. There is, for example, the electrical connection between thermocouple and electrically operated indicator, for example, light emitting diodes or liquid crystals, possible mechanical connection in the form, in the example, of the liquid column in thermometer, the cylinder of which can be considered as a temperature sensor, and the scale as an indicator in the sense of this invention, or can even be used identity sensor with an indicator if the temperature sensor to use a material whose color changes depending on the temperature.

Instead of direct measurement of the temperature in the relevant field can also estimate the temperature in the corresponding area on the basis of the temperature measured elsewhere in the fridge, and knowing the ratio between the measured temperature and the temperature in the respective field. It is preferable to use at least one sensor for measuring the temperature inside the refrigerating chamber and at least one sensor for measuring the ambient temperature near the refrigerator. The prevailing temperature in the corresponding area, or temperature, which should show the indicator can be easily determined from the measured temperatures using the table.

In a preferred embodiment of the refrigerator has a control unit to control operation of the refrigeration machine in accordance with a preset temperature value and at least one measured value of the temperature in the refrigerator, and the control unit is placed controls the indicator in accordance, at least one measured temperature.

Temperature sensor, which in the framework of the invention is used to measure the temperature inside the refrigerating chamber, must have a large time constant to periodic temperature fluctuations caused by intermittent mode of operation of the refrigeration machine, in the main, were not reflected in the measurement results of the sensor. According to the first variant, this large time constant can be realized using electronic shaper average. This option is especially useful if the same temperature sensor is used for thermostatic regulation of the mode of operation of the refrigeration machine. In this case, the first output signal of the temperature sensor for thermostatic regulation may be obtained from the electronic imaging unit mean.

Other opportunities to create greater inertia of the temperature sensor are the application of heat insulating material between the sensor and the environment to retard heat transfer between them and/or the application of a thermal moderator in thermal contact with the sensor element and with the environment surrounding the temperature sensor.

A brief list of figures

Other characteristics and advantages of the present invention derive from the following is relevant for the description of examples of implementation with reference to the drawings, which represent:

Figure 1 is a perspective projection of the refrigerator in accordance with the invention with the door open;

Figure 2 is a front view of the indicator for refrigerator according to the first embodiment;

Figure 3 - view of the indicator shown in figure 2;

4 is a front view of the indicator for refrigerator according to the second variant;

5 is a view of the indicator shown in figure 4;

6 is a Block diagram of parts of the refrigerator in accordance with a third variant of the invention.

The implementation of the invention

1 shows a perspective projection of a refrigerator in accordance with the invention with an open door 7. Pictured refrigerator is a combination of the refrigerating and freezing chamber and a refrigerating chamber 1 is located at the top and freezer 2 - bottom. Because in the freezer the temperature difference between the warmest and coldest point is usually smaller than in the refrigerating chamber, and the temperature in the freezer is usually so low that the hottest point and the coldest point on its suitability for storage of various products practically do not differ, the invention primarily involves the refrigerating chamber and is therefore described below with respect to the refrigerating chamber 1.

Cooling chamber 1 is divided in the vertical direction regiment is mi 4, mounted on the side walls 3 of the body, the number of parts or areas 5, 5'. Two areas 5', located at the very bottom, limited drawer 18; overlying region 5 open side door 7. They are cooled not shown in the figure by the evaporator, which is located behind the rear wall 6 of the refrigerating chamber 1 at the height of the regions 5. In each of these areas 5 there is a significant temperature difference from the coldest place in the rear wall 6 to the warm place near the door 7. As the cold air in the refrigerating chamber 1 tends to fall, the underlying region 5 in General overlying colder; i.e. the total temperature difference between the warmest and coldest point of the entire refrigerating chamber 1 is greater than the temperature difference in some areas 5. Region 5' on average warmer regions 5, because they are not in direct thermal contact with the evaporator.

One group of relatively warm areas form the shelves 8, installed on the door. The warmest of these areas is the Department for oil 9, separated the cover from the rest of the refrigerating chamber 1./

To separate areas 5, 5', 8, 9 assigned the corresponding indicator 10, 11, ..., 17, designed to indicate to the user what kinds of products should be stored in the corresponding area. Indicators 10-17 differ with the particular their distribution; their structure may be the same. It will be described below with reference to figure 2-5.

Two indicators, designated 10, are respectively to regions 5' and attached to the front sides of the drawer 18. It is advisable to place the LEDs 10 in the respective drawers 18, so that they were directly exposed to the temperature existing in the drawer, visible through the transparent front wall of the drawer 18 and easy to read.

The indicator 11 is pressed against the front edge of the shelf 4 and moves away from her down. He relates to the field 5 under the appropriate shelf 4, hangs in this area and is subjected to temperature it. In order not to interfere with the loading and unloading of the refrigerator in region 5, it is desirable that the indicator 11 was hinged to the shelf 4 and was easily held back by him food, and then returned in the depicted position.

Another indicator 12 is attached to the front edge of the shelf 4 and acts up in the appropriate area 5. This indicator is also hinged to the front edge of his berth 4 and provided with a spring that returns it to the depicted position, when he overturns when loading and unloading products in the relevant field 5. The method of attaching the indicator 12 is preferred method of attachment of the indicator 11, the WMD that the local temperature, which affects the indicator 12, closer to the average temperature value of the corresponding region 5 than in the case of the indicator 11, which is located in a relatively warm place their field,

The indicator 13 is placed under the glass shelves 4, and his testimony can be read through the glass the same way as is done with the indicator 10. Since the indicator 13 may be located at some distance from the front edge of the shelf 4, the temperature to which it is exposed, in General, closer to the average temperature of the corresponding area 5 than in the case of indicators 11 and 12.

The indicator 14 is fixed on one of the side walls 3 of the refrigerating chamber 1. The advantage of this method of placement is that the position indicator 14 on the side wall 3 to a considerable extent can be chosen arbitrarily, and therefore, can be selected so that the indicator 14 in normal conditions was subjected to temperatures very close to the average temperature of the corresponding area 5.

The indicator 15 is in the related region 5 shelves 1 on its rear wall 6. This rear wall 6 in General colder than it cooled region 5. In order to prevent the issuance of the indicator 15 false information on the back side of the indicator 15 facing to the rear wall 6 may be provided for insulating use adca.

Other indicators 16, 17, relating to educated on the door of the 7 areas 8, 9, fixed to the inner door trim 7.

From the above different ways posted by indicators 11-15 in the refrigerating chamber 1 for all regions 5 is typically used only one type to map the individual indicators with different areas remained obvious to the user.

Figure 2 and 3 show a front view and a section along the line III-III in figure 2 of the first example of a performance indicator, which can be used as indicators 10-17. In a plastic case 19 behind the transparent plate 20 is a substrate 21. On facing the plate 20 side of the substrate 21, sealed in foil 22, coated with various materials that change color depending on temperature. The materials applied in the form of 25 characters, which are ideograms with images of a variety of typical products. In the example shown here is vegetables, dairy products and meat products, optimum storage temperatures are different. Change their color shows the user what type of products suitable area to which the indicator.

The indicators 10, 13 as plate 20 can serve as a transparent front side of a drawer or glass shelves 4.

On the back of the plate 20 side of the substrate 21 find the camping Luggage 23, filled with a thermal retarder, such as brine. Heat the moderator is to slow down the speed at which the indicator detects the temperature change of the surrounding environment, so that the periodic temperature changes associated with intermittent control operation of the refrigeration machine, fridge, not reflected in the display.

As another means for slowing the speed of the tracking indicator can be used by layers of insulating material. In this layer the camera 23 may be surrounded everywhere where it is not blocking and not impede the view of the 25 characters, or it may, in particular, in the case of the indicator 15, as mentioned above, be placed only on the back side of the indicator, for example, a layer 24 of foam. As thermal insulation can serve as a layer of air between the cover 20 and the substrate 21.

Figs.4 and 5 show a front view and a section along the line V-V in figure 4 of the second version of the indicator. The housing cover 20, the substrate 21 and is filled with a thermal retarder chamber 23 are the same as described above with reference to figure 2 and 3. Symbols or pictograms are 25 different types of products are directly printed on the substrate 21 or pasted on it. Along characters 25 extends across the substrate 21 and the tube 26 of thermometer, the cylinder 27 which is immersed in a thermal retarder in ka the ore 23. The liquid column in the tube 26 extends to the symbol 25 of the product, the optimum storage temperature corresponds to the temperature of thermal retarder.

Of course, in this version, the characters 25 can also be replaced by a temperature scale with the division into degrees.

Indicator 4 and 5 is a compact, convenient mounting element. Of course, the housing may have any other shape, in particular it can be made so that the chamber 23 with brine and cylinder 27 was located in the refrigerator in the Central point area, for example approximately in the middle of the shelves, and the substrate 21 with the characters 25 and the tube 26 in a well visible place for the user, in particular on the front edge of a shelf.

The third variant of the construction of a refrigerator in accordance with the invention is schematically shown in Fig.6. The control unit 28 of the refrigerator controls the operation of the condenser 29 refrigerating machine in a known manner on the basis of measured data of the temperature sensor 30, which is located in the refrigerating chamber 1 and is connected by a line 31 to the control unit 28. Passed by line 31 to the signal, for example enhanced thermoelectric power of thermocouple 32, immediately reacts to changes in temperature in the refrigerating chamber 1. B part temperature sensor 30 further includes a shaper 33 average value, for example RC-link, to the which perceives the output signal of thermocouple 32 and with a given time constant is sent to the control unit 28 moving average value of thermopower. In the figure shaper 33 average value separated from the control unit 28 and connected to it by a separate line 34; of course, the control unit 28 and the shaper 33 average can be implemented in a single device, such as a microprocessor. As a heat moderator in previous versions, the shaper 33 average value is used in order to average the fluctuations of the temperature in the refrigerating chamber, caused by the intermittent mode of operation of the refrigeration machine.

The second temperature sensor 35, is also equipped with a shaper 36 average, built-in refrigerator, to measure the temperature of the surrounding environment. It is connected with the control unit 28. On the basis of the average of the temperatures determined by the shapers 33, 36 the mean, and known conditions of thermal conductivity of the refrigerating chamber 1, the control unit 28 may calculate the average temperatures in different areas 5 of the refrigerating chamber 1. This calculation can be essentially performed by solving the differential equation of thermal conductivity, however, an easier solution is to use a reference table stored in the ROM 37, associated with the control unit 28. This ROM is described by the manufacturer of the refrigerator indicating the measured temperatures in different areas of the prototype refrigerator at different combinations of the two FCP the United temperatures.

To the control unit 28 is connected further, a number of indicators 38 installed within the refrigerating chamber 1 in a visible spot areas 5 to which they relate.

As an alternative or Supplement such indicators can also be installed on the outer side of the cooling body, in particular on its front side. The relative position of the indicator 38 corresponds to the location of the fields in the refrigerating chamber, so that the user on the status indicator can directly conclude to which the field belongs display.

Indicators 38 can be performed, for example, as led or LCD displays. Shown in the figure, the indicators display zone consists of two parts, one of which is displayed in accordance with the calculated control unit 28 temperature of the corresponding area 5 symbol corresponding to 25 characters on 2 and 4, and the other part is used for the digital display of the calculated temperature. For the purposes of the invention would be enough if there were only one of the two parts of the field display. Alternatively could be used as an indicator, in which a few characters would be located on the same substrate, as shown in figure 2, and each character would be given a light source for illumination or backlight character is which would selectively switch on and off by the control unit 28.

1. Refrigerator having at least one bounded by the housing and the door, the refrigerating chamber (1), the temperature in the entire volume of which varies in a certain range depending on location and time, containing a number of areas (5, 51, 8, 9), in which the local variation of temperature depending on the time and place is smaller than the total range of temperature fluctuations depending on the time and place for the entire refrigerating chamber, characterized in that at least one of the regions (5, 51, 8, 9) corresponds to the indicator (10-17, 38) for output representative data regarding the temperature range in this field.

2. The refrigerator according to claim 1, characterized in that the indicator (10-17, 38) is located in the refrigerating chamber (1) in accordance with the location of the area (5, 51, 8, 9)to which it belongs.

3. The refrigerator according to claim 1, characterized in that the indicator (38) is located on the front side of the housing of the refrigerator.

4. A refrigerator according to one of claims 1 to 3, characterized in that the cooling chamber (1) is divided into the first group, consisting of one or more regions (8, 9), close to the refrigerator door, and a second group consisting of one or more regions (5, 51), remote from the door.

5. A refrigerator according to one of claims 1 to 3, characterized in that the cooling chamber (1) has, at IU is e, one shelf (4), which forms the border between areas (5).

6. The refrigerator according to claim 1, characterized in that the indicator (10-17, 38) is configured to display changing data.

7. The refrigerator according to claim 6, characterized in that the output data is a digital temperature display.

8. The refrigerator according to claim 6, characterized in that the output is a text or pictographic symbols of products that are recommended to be stored in this field.

9. The refrigerator in one of PP-8, characterized in that the indicator (10-17, 38) is connected with the first temperature sensor (22, 27)for measuring the temperature in the corresponding region (5, 51, 8, 9).

10. The refrigerator in one of PP-8, characterized in that it has a control unit (28) to control the operation of the refrigeration machine in accordance with a preset temperature value and at least one measured value of the temperature in the refrigerator and the control unit (28) controls the indicator (38) in accordance at least one measured temperature.

11. Refrigerator of claim 10, characterized in that the control unit (28) connected to at least one first temperature sensor (30) for measuring the temperature inside the refrigerating chamber (1) and at least one second temperature sensor (35) for measuring the temperature of the refrigerator shall delnik environment.

12. The refrigerator according to claim 11, characterized in that the control unit (28) includes a table (37) with the data that is output in dependence on measured values of the temperature inside and outside of the refrigerator.

13. The refrigerator according to claim 9, characterized in that it contains an intermittent or sequential mode of the refrigeration machine and the first temperature sensor (22, 27, 30) is designed so that with time constant to measure the average temperature, and the time constant is chosen large enough to average the temperature fluctuations associated with the intermittent mode of operation of the refrigeration machine.

14. The refrigerator according to claim 11 or 12, characterized in that it contains an intermittent or sequential mode of the refrigeration machine and the first temperature sensor (22, 27, 30) is designed so that with time constant to measure the average temperature, and the time constant is chosen large enough to average the temperature fluctuations associated with the intermittent mode of operation of the refrigeration machine.

15. The refrigerator according to item 13, wherein the first temperature sensor (30) includes an electronic driver (33) of the average value.

16. The refrigerator according to item 13, wherein the first temperature sensor (22, 27) posted by insulating material (24) to slow equalization of temperature between the temperature sensor (22, 27)and its surroundings and/or thermal retarder (23) in thermal contact with the temperature sensor (22, 27) and his entourage.

17. The refrigerator according to 14, characterized in that the first temperature sensor (22, 27) posted by insulating material (24) to slow equalization of temperature between the temperature sensor (22, 27) and its surroundings and/or thermal retarder (23) in thermal contact with the temperature sensor (22, 27) and its surroundings.



 

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