The way to maintain the temperature in the refrigerator

 

(57) Abstract:

The refrigerant fed into the evaporator of the freezing chamber, and then communicated from the last evaporator of the refrigerating chamber. Carry out the temperature control in the freezer. Taking into account the rise and fall of the specified limit values of the temperature in one of the cells, respectively, terminate or renew the flow of refrigerant into the evaporator. The termination or renewal of the supply of the refrigerant is performed with the specified limit values of the temperatures determined in the refrigerating chamber. When raising the upper setpoint temperature in the freezer carry out periodic forced circulation of air in it, which is periodically stop when it reaches the lower setpoint temperature in the freezer. The use of the invention will improve the efficiency of the evaporation chambers, to reduce the time to reach the desired temperature in the cells, to improve the accuracy of temperature control and to reduce the consumption of electricity. 2 C.p. f-crystals, 1 Il.

The invention relates to a low-temperature technique, in particular to a method of maintaining a predetermined temperature in the refrigerator.

This method requires complex electronic systems, complex control algorithms of these systems to provide complex mathematical dependencies in the implementation of this method, which complicates the design and reduces the reliability of the refrigerator.

There is a method of maintaining the temperature in the refrigerator with the freezing and refrigerating chambers with a single refrigerant circuit, namely, that serves the refrigerant in the evaporator of the freezing chamber, and then communicated from the last evaporator of the refrigerating chamber, carry out the temperature control in the freezer, taking into account the rise and fall of the specified limit values in one of the cells, respectively, terminate or renew the flow of the refrigerant in the evaporator (see uzhansky B. C. and other Refrigeration automation, -M.: Food industry, 1971, S. 240).

The disadvantages of this method are the low efficiency of the evaporator of the refrigerator by placing the liquid separator downstream of the evaporator of the freezing chamber, before the use of this invention is to improve the efficiency of the evaporator chambers of the refrigerator, reducing the time to reach the desired temperature in the refrigerating and freezing chambers, improving the accuracy of temperature control in all temperature zones at any temperature in the room and the reduction due to the consumption of electricity.

The technical result is achieved in that way maintain the temperature in the refrigerator with the freezing and refrigerating chambers with a single refrigerant circuit, is that serves the refrigerant in the evaporator of the freezing chamber, and then communicated from the last evaporator of the refrigerating chamber, carry out the temperature control in the freezer, taking into account the rise and fall of the specified limit values in one of the cells, respectively, terminate or renew the supply of refrigerant to the evaporator, and the termination or renewal of the supply of the refrigerant is performed with the specified limit values of the temperatures determined in the refrigerating chamber, when raising the upper setpoint temperature in the freezer carry out periodic forced circulation of air in it, which is periodically stop when reaching the bottom of the set value in the freezer.

About the preset limit temperature Txjudged taking into account the ambient temperature.

The drawing shows a device implementing this method. The device comprises a freezing chamber 1, the refrigerating chamber 2, a closed circulating circuit 3 sequentially placed evaporators 4 and 5 respectively of the freezing and refrigerating chambers. In the freezer 1 posted by the temperature sensor 6 and the fan 7. Additional temperature sensors 8 and 9 respectively installed in the refrigerating chamber 2 and on the surface of the refrigerator. The device is equipped with a power on and off 10 and the processing block parameters 11. The refrigerant circuit 3 includes a compressor 12.

The device operates as follows. The refrigerant enters the evaporator 4 of the freezing chamber 1, and then communicated with him in the evaporator 5 of the refrigerating chamber 2. Monitor the temperature in the freezing and refrigerating chambers. reduce or resume the supply of the refrigerant in the refrigerant circuit 3. The termination or renewal of the supply of the refrigerant is performed with the specified limit values of the temperatures determined in the refrigerating chamber. When raising the upper setpoint temperature in the freezer carry out periodic forced circulation of air in it, which is periodically stop when reaching the bottom of the set value in the freezer.

The temperature Ttcontrol at one point in the refrigerating chamber, and the specified limit values of the temperature Txjudged according to the following ratios:

Tx=Ty+(Tt-Tz)

where Ty- the desired temperature in the center of the camera;

Tt- the temperature at one point the camera;

Tz- current temperature in the center of the camera.

Block processing parameters 11 analyzes the values of the current and desired temperatures. The results of the analysis processing block parameters 11 acts on the block 10, which enables and disables the compressor 12 and the fan 7 of the freezing chamber 1. If there is no movement of air in the freezing chamber 1, the temperature of the evaporator 4 is lowered to the boiling point of the refrigerant. This reduces the intensity of the boil heparitin 5 of the refrigerating chamber 2. Thus, by shutting off the fan 7 of the evaporator 4 of the freezing chamber 1 increases the efficiency of the evaporator 5 of the refrigerating chamber 2.

The obstacle to increasing temperature in the freezing chamber 1 is due to the natural convection of air through the evaporator 4. The flow of the refrigerant in the evaporator 4 of the freezing chamber 1 is not terminated, eliminating the need to use decimates.

When the temperature in the freezer above the upper setpoint, the unit 10 includes a compressor 12 and the fan 7 of the freezing chamber 1. When reaching into the freezer set temperature unit 10 turns off the fan 7, the compressor remains in operation, if the temperature in the refrigerating chamber 2 has not reached the lower setpoint. When the temperature in the refrigerating chamber above the upper setpoint, the unit 10 includes a compressor 12, the fan 7 is enabled only if the temperature in the freezing chamber 1 above the lower setpoint, that is required to regulate the temperature of the freezer.

When all the temperature measurements in the cupboard values correspond to the temperature of the installation location of the sensors 6, 8. Tributaries of heat, the temperature value is different. The temperature difference between the center of the camera and the sensor 8 at a certain ambient temperature depends on each specific model only from the place of installation of the sensor. In the limit values of the temperatures of the refrigerating chamber 2 introducing the amendment, the value of which corresponds to the ambient temperature measured by the sensor 9. Correction rate may vary as to continuously change the value of the ambient temperature, and discretely, i.e. by a certain amount at a certain value change of the ambient temperature. Therefore, the setpoint temperature Txdefined as the sum of the required temperature in the center of the camera Tyand the temperature difference between the center of the camera Tyand the installation location of the sensor 8 Ttadjusted from the ambient temperature f(To).

Tx= Ty+ (Tt- Tz)+f(To)

where Ty- the desired temperature in the center of the camera;

Tt- the temperature at one point the camera;

Tz- current temperature in the center of the camera;

To- ambient temperature.

With increasing ambient temperature RA is a career and a place to install the sensor 8. Block processing parameters 11 takes into account the signal from the sensor 9, reduces the setpoint temperature Tx. The compressor 12 is turned on and off at lower temperatures and thus provides a constant temperature in the center of the camera.

With decreasing ambient temperature, the heat leakage through the insulation into the chamber of the refrigerator is reduced, the temperature difference between the center of the camera and the sensor 8 is also reduced. Block processing parameters 11 takes into account the signal from the sensor 9, increases the setpoint temperature Tx. The compressor 12 is turned on and off at higher temperatures and thus provides a constant temperature in the middle of the chamber.

Thus, at a constant set point temperature cameras change in the value of the amendment, the corresponding change in the ambient temperature, which allows as to prevent excessive loss, and excessive temperature rise in the chamber.

To accommodate the different design features of the models of refrigerators in the unit of processing parameters 11 introduce several variants of the amendments from the ambient temperature cf the and processing parameters 11, and the power on and off 10 enter a signal corresponding to this model of refrigerator. This signal processing block parameters 11 selects amendments from the ambient temperature f(Toto control the temperature within the chambers of the refrigerator corresponding to this model of refrigerator. The signal corresponding to the model of the refrigerator, is introduced into the processing block parameters 11 or continuously, or every time I turn the fridge into the grid.

Thus, the use of the invention allows to:

to improve the efficiency of evaporators cameras,

to reduce the time to reach the desired temperature in the refrigerating and freezing chambers,

to improve the accuracy of temperature control in all temperature zones, at all ambient temperatures,

to reduce power consumption,

to increase the reliability of the refrigerator by reducing the number of circuit elements of the regulation.

1. The way to maintain the temperature in the refrigerator with the freezing and refrigerating chambers with a single refrigerant circuit, namely, that serves the refrigerant in the evaporator of the freezing chamber, and then in sooben the ohms the rise and fall of the specified limit values in one of the cells, respectively, terminate or renew the supply of refrigerant to the evaporator, characterized in that the termination or renewal of the supply of the refrigerant is performed with the specified limit values of the temperatures determined in the refrigerating chamber, while increasing upper setpoint temperature in the freezer carry out periodic forced circulation of air in it, which is periodically stop when reaching the bottom of the set value in the freezer.

2. The method according to p. 1, characterized in that the control temperature Ttat one point in the refrigerating chamber, and the specified limit values of the temperature Txjudged according to the following ratios:

Tx= Ty+ (Tt- Tz)

where Ty- the desired temperature in the center of the camera;

Tt- the temperature at one point the camera;

Tz- current temperature in the center of the camera.

3. The method according to PP.1 and 2, characterized in that the preset limit temperature Txjudged taking into account the ambient temperature:

Tx= Ty+ (Tt- Tz) + f (To)

where Ty- the desired temperature in the center of the camera;

Tt- the temperature at one point the camera;

Tz- the current temperature is

 

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