KR19990034848A - Cooling control unit - Google Patents

Abstract

The present invention relates to a control system of a cooling apparatus having a plurality of evaporators, and in particular, having a temperature detection means around the plurality of evaporators installed at the upper and lower ends of the furnace, respectively, By controlling the operation separately, the present invention relates to a cooling control device capable of keeping the internal temperature at an optimal state and keeping the goods fresh.

Description

Cooling control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for a chiller having a plurality of evaporators, and more particularly to a cooling control device for separately controlling the operation of each evaporator according to the temperature in a refrigerator of a refrigerator / freezer having a plurality of evaporators. .

The basic principle of cooling is to take away the surrounding heat when the liquid becomes a gas, that is, to take heat away from the surrounding air and objects by the latent heat of vaporization (vaporization heat). The refrigerant is made into a gas by releasing the refrigerant into the cooling tube and releasing it into the air to extract the heat necessary for evaporation from the surroundings, and the surrounding air and the object become cold.

1 is a schematic view showing a showcase cooling control apparatus according to the prior art, comprising: a compressor (1) for absorbing and recovering gas refrigerant introduced through a cooling tube and compressing the gas into a gas of high temperature and high pressure; A condenser (3) for cooling and liquefying a gas refrigerant compressed at high temperature and high pressure to a temperature at which it is easy to evaporate, a capillary tube (5) for expanding and decompressing a high pressure gas discharged from the condenser (3) at a low pressure; The liquid refrigerant gas flowing out of the capillary tube 5 expands at low temperature and low pressure, and is provided in the plurality of evaporators 7 and 9 to cool the inside of the capillary tube 5 and the refrigerant passages of the capillary tube 5 and the evaporator 7 to provide predetermined control. The valve 11 for opening and closing the refrigerant flow in accordance with the signal, the temperature detection sensor 13 is located in the periphery where the evaporator 7 is installed and outputs a signal corresponding to the temperature in the chamber and the temperature detection sensor ( Output from Includes a control unit 15 for adjusting the flow of the refrigerant by controlling the operation of the compressor 1 and the valve 11 in accordance with the temperature information.

In addition, the plurality of evaporators 7 and 9 are located at the upper and lower ends of the showcase, respectively, and the temperature detection sensor 13 is located around the evaporator 7 at the upper end of the furnace.

The controller 15 of the showcase configured as described above outputs a control signal corresponding to the compressor 1 and the valve 11 when the temperature information of a predetermined temperature or more is output from the temperature detection sensor 13 located in the upper part of the inside of the refrigerator. By controlling the operation of the plurality of evaporators (7, 9) to operate both to cool the inside.

At this time, the hot air is circulated by the natural convection, the hot air rises and the cold air is lowered due to the phenomenon that the temperature difference between the top and bottom of the interior is severe.

Therefore, the inside temperature of the top of the showcase is kept somewhat higher than the temperature of the bottom, and because the plurality of evaporators are operated at the same time by the temperature detection sensor located at the top of the showcase, the bottom temperature of the store is kept lower than the temperature desired by the user There was this icing issue.

In order to solve the problems of the prior art as described above, the object of the present invention is provided with temperature detecting means around the plurality of evaporators installed at the upper and lower ends of the refrigerator, respectively, and separate operation of the plurality of evaporators according to the upper and lower temperatures in the upper chamber. It is to provide a cooling control device for controlling by.

In order to achieve the above object, the apparatus of the present invention is a compressor for absorbing and recovering gas refrigerant evaporated in a predetermined evaporator, and compressing the gas refrigerant at high temperature and high pressure, and cooling the gas refrigerant compressed at high temperature and high pressure in the compressor to liquefy. A cooling apparatus having a condenser, comprising: a first evaporator configured to evaporate an incoming liquid refrigerant gas to cool an inside of the refrigerator; A second evaporator configured to evaporate the liquid refrigerant gas provided through the first evaporator to cool the inside of the refrigerator; A first valve installed in the refrigerant passage between the condenser and the first evaporator and opening and closing the flow of the refrigerant in accordance with a predetermined control signal; A second valve installed in the coolant passage between the first evaporator and the second evaporator and opening and closing the supply of the coolant to the second evaporator according to a predetermined control signal; A third valve installed in the refrigerant passage between the first evaporator and the compressor and opening / closing the refrigerant through the first evaporator to the compressor according to a predetermined control signal; A plurality of temperature detection means for respectively sensing the internal temperature of the surroundings in which the first evaporator and the second evaporator are installed and output a signal corresponding thereto; And a controller for receiving a temperature related signal output from the plurality of temperature detecting means and controlling the compressor and the plurality of valve operations, respectively, to adjust the refrigerant flow direction.

1 is a schematic diagram showing a conventional showcase cooling control device.

2 is a block diagram showing a cooling control apparatus according to an embodiment of the present invention.

3 is a view illustrating an appearance of a showcase of FIG. 2 according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

20: compressor. 22: condenser.

24: capillary tube. 26: first evaporator.

28: second evaporator. 30: first valve.

32: second valve. 34: third valve.

36: first temperature detecting means. 38: second temperature detecting means.

40: control unit.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 is a block diagram showing a cooling control apparatus according to an embodiment of the present invention, which includes a compressor 20, a condenser 22, a capillary tube 24, first and second evaporators 26 and 28, and And first and second and third valves (30, 32, 34), a plurality of temperature detecting means (36, 38), and a controller (40).

On the other hand, the compressor 20 is configured to absorb and recover the gas refrigerant evaporated in a predetermined evaporator and compress it at high temperature and high pressure, and the condenser 22 is a gas refrigerant compressed at high temperature and high pressure in the compressor 20. Is cooled to liquefy, and the capillary tube 24 is configured to expand and reduce the high pressure gas discharged from the condenser 22 to a low pressure.

In addition, the first evaporator 26 is configured to evaporate the liquid refrigerant gas flowing from the capillary tube 24 to cool the inside of the chamber, and the second evaporator 28 is provided through the first evaporator 26. The liquid refrigerant gas is evaporated to cool the inside of the refrigerator.

In addition, the first valve 30 is installed in the refrigerant passage between the condenser and the first evaporator 26 and is configured to open and close the flow of the refrigerant in accordance with a predetermined control signal, and the second valve 32 is the first valve. Installed in the refrigerant passages of the first evaporator 26 and the second evaporator 28 and configured to open and close the refrigerant to be supplied to the second evaporator 28 in accordance with a predetermined control signal. It is installed in the refrigerant passage between the first evaporator 26 and the compressor 20 and is configured to open and close the refrigerant passing through the first evaporator 26 to the compressor 20 according to a predetermined control signal.

In addition, a plurality of temperature detection means (36, 38) are installed around the first evaporator 26 and the second evaporator 28, respectively, and the temperature in the air around the first and second evaporators (26, 28), respectively. It is configured to detect and output a signal corresponding thereto, the control unit 40 receives the temperature-related signal output from the plurality of temperature detection means (36, 38) and accordingly the compressor 20 and the plurality of valves 30 Control the operation of refrigerant flow, respectively.

On the other hand, the plurality of temperature detecting means, respectively, the first temperature detecting means 36 for detecting the ambient temperature in the surroundings in which the first evaporator 26 is installed, and the ambient temperature in the surroundings in which the second evaporator 28 is installed, respectively. It is preferable that the second temperature detecting means 38, the temperature detecting means 36, 38 are thermostat sensors, and the plurality of valves are solenoid valves.

That is, when the controller 40 receives the internal temperature detection signal of a predetermined temperature or more from the first and second temperature detection means 36 and 38, the controller 40 outputs a predetermined control signal corresponding thereto to output the first and second valves. Opening the 30 and 32, respectively, controls the first and second evaporators 26 and 28 to receive the refrigerant through the first valve and the second valve 30 and 32 to cool the inside of the refrigerator. At this time, the third valve 34 is closed according to the control signal of the controller 40.

However, when the controller 40 receives the internal temperature detection signal of a predetermined temperature or more from the first temperature detecting means 36, the controller 40 outputs a predetermined control signal corresponding thereto to output the first valve 30 and the third valve 34. ), The first evaporator 26 receives the refrigerant introduced through the first valve 30 to cool the chamber, and the refrigerant is supplied to the compressor 20 via the third valve 34.

As described above, the present invention can individually operate the evaporator installed at the upper and lower ends by the temperature detecting means respectively installed at the upper and lower ends of the showcase.

3 is a view showing the appearance of the showcase of FIG. 2 according to an embodiment of the present invention, the shelf 16 for displaying and storing goods in the showcase and the goods stored in the shelf 16 The first upper evaporator 26 for cooling the gas, the temperature detecting means 36 of the upper shelf part 16 for determining the operation of the first evaporator 26, and the lower shelf part for displaying and storing the goods inside the showcase. (18), a temperature detection means (38) of the second lower evaporator (28) for cooling the goods stored in the lower shelf (18), and the lower shelf (18) for determining the operation of the second evaporator (38). ) And the like.

On the other hand, the temperature detection means is composed of a thermostat (Thermostat) sensor, the operation principle is as follows.

First, when the temperature in the refrigerator or the evaporator is lowered, the temperature of the thermal tube 37 is lowered, and the temperature of the refrigerant gas enclosed in the diaphragm 39 is also lowered, so that the internal pressure decreases (contracts). The contact is turned off. When the contact is turned off, the controller 40 outputs a predetermined control signal to stop the operation of the compressor 20.

In addition, if the temperature in the evaporator or the furnace gradually rises, the pressure in the diaphragm 39 also increases (expands) according to the excitation. Operation of the compressor 20 is started.

The showcase configured as described above is divided into an upper end 16 and a lower end 18, and temperature detection means 36 for controlling the operations of the evaporators 26 and 28 and the evaporator respectively on the upper and lower ends 16 and 18. 38), the first and second evaporators 26 and 28 are individually controlled according to the internal temperatures of the upper and lower ends 16 and 18 to prevent the product stored in the lower end 18 from freezing. You can prevent it.

Therefore, as described above, in the present invention, in a refrigerator / freezer equipped with a plurality of evaporators, the operation of the evaporator is individually controlled by providing a sensor for detecting the temperature or the internal temperature of each evaporator at a position where each evaporator is installed. It can be controlled to keep the internal temperature at an optimum state, and keep the goods fresh.

Claims (6)

A cooling device comprising a compressor for absorbing and recovering gas refrigerant evaporated in a predetermined evaporator, and compressing the gaseous refrigerant compressed at high temperature and high pressure, and a condenser for cooling and liquefying the gas refrigerant compressed at high temperature and high pressure in the compressor. A first evaporator configured to cool the inside by evaporating the incoming liquid refrigerant gas; A second evaporator configured to evaporate the liquid refrigerant gas provided through the first evaporator to cool the inside of the refrigerator; A first valve installed in the refrigerant passage between the condenser and the first evaporator and opening and closing the flow of the refrigerant in accordance with a predetermined control signal; A second valve installed in the coolant passage between the first evaporator and the second evaporator and opening and closing the supply of the coolant to the second evaporator according to a predetermined control signal; A third valve installed in the refrigerant passage between the first evaporator and the compressor and opening / closing the refrigerant through the first evaporator to the compressor according to a predetermined control signal; A plurality of temperature detection means for respectively sensing the internal temperature of the surroundings in which the first evaporator and the second evaporator are installed and output a signal corresponding thereto; And a control unit for receiving a temperature related signal output from the plurality of temperature detecting means and controlling the compressor and the plurality of valve operations, respectively, to adjust the refrigerant flow direction. The method of claim 1, wherein the plurality of temperature detection means, the first temperature detection means for detecting the temperature in the ambient air around the first evaporator, and the second temperature detection for detecting the temperature in the ambient air around the second evaporator, respectively. Cooling control device comprising a means. The cooling control device according to claim 1, wherein the temperature detecting means is a dermastat. 2. The cooling control device according to claim 1, wherein the plurality of valves are solenoid valves. The method of claim 1, wherein the control unit, when a predetermined or more internal temperature is detected from a plurality of temperature detection means, the first valve and the second valve are opened, respectively, and the first and second evaporators are supplied with refrigerant to cool the interior. Cooling control device characterized in that the control. The cooling control device according to claim 1, wherein the control unit controls the second valve to close and open the first valve and the third valve when a predetermined or higher internal temperature is detected from the first temperature detecting means. .