KR101011214B1 - A cooling device - Google Patents

Abstract

According to the present invention, the heating effect of the refrigerant movement occurring in the on / off cooling system is reduced, and the recharging of the vaporizer 5 into the refrigerant at the start of the next compressor 2 on section is improved.

Description

Cooling unit {A COOLING DEVICE}

The present invention relates to a cooling device in which a refrigerant movement direction is indicated.

Especially in cooling devices (eg refrigerators, deep freezers, air conditioners, etc.) with periodic cooling systems, suction lines and discharge lines, unless precautions are taken during the off cycle of the compressor. The refrigerant path from the condensor to the evaporator occurs until the pressure in the discharge line is in equilibrium. This condition, called refrigerant migration, results in local overheating of the ambient temperature, particularly in the interior portion of the room corresponding to the first vaporizer path where the vaporizer inlet is located. Thus, the temperature in this area and the thermal load of the room being cooled increase due to the refrigerant migration effect. This condition introduces additional thermal loads inside the cooled room, impedes the uniform distribution of heat in the cooled room, and increases energy consumption with long term compressor operation.

Various embodiments developed to minimize the effects of such refrigerant movements are described in various recent technical documents.

One such document is European Patent Application EP0692687. In this application, the prevention of refrigerant movement using a solenoid valve located at the capillary inlet controlled by the controller is described.

Another latest technical document is International Patent Application WO2005088212. In this application, explanation is given for the prevention of refrigerant movement and for eliminating compressor starting problems.

In embodiments where refrigerant movement is prevented, the vaporizer remains dry because it is not charged with refrigerant. At the start of the compressor on-interval, a predetermined time interval passes so that the refrigerant charges the carburetor and drops to the vaporization temperature along the entire carburetor. This process, called charge distribution in the vaporizer (the vaporizer is charged with refrigerant), results in a decrease in vaporizer efficiency and a decrease in cooling capacity during this time period. Although refrigerant movement prevention provides a certain reduction in energy consumption, a vaporizer filled with refrigerant takes longer because the vaporizer remains dry throughout the off period.

An object of the present invention is to implement a cooling device in which the vaporizer is recharged with the refrigerant at the time of opening of the next compressor on while the effect of refrigerant movement is reduced.

The cooling device described in claim 1 and its dependent claims, embodied for the purpose of the present invention, is preferably used as an expansion element by being disposed between the condenser and the expansion element to remain closed during the off section of the compressor. A bi-solenoid valve which prevents refrigerant flow from the condenser to the vaporizer by means of a capillary tube, an additional expansion connected at one end to the valve and the other at the vaporizer path between the inlet and outlet of the vaporizer, preferably in the path near the final path. An element and a valve between the point at which the expansion element is connected to the vaporizer and the first path of the vaporizer.

Valves disposed between the carburetor paths remain open during the on-section of the compressor to allow refrigerant to flow along the carburetor and remain closed during the off-section of the compressor to provide additional expansion elements due to refrigerant movement from reaching the first path of the carburetor. This prevents the refrigerant from reaching the vaporizer and directs the refrigerant only to the final path of the vaporizer.

Therefore, during the off period of the compressor, the flowing refrigerant is directed to the final path of the vaporizer using the additional expansion element due to the refrigerant movement effect by the capillary from the condenser to the vaporizer, and the heating effect resulting from the refrigerant movement is reduced. In order to reduce the refrigerant movement effect, instead of completely preventing this, changing the direction of refrigerant movement helps at the same time strengthening the redistribution process of the refrigerant.

In another embodiment of the present invention, the valve between the vaporizer paths is opened by the control before the compressor starts the on section, and the refrigerant is provided to be distributed in the entire vaporizer before the compressor starts the on section. Thus, by opening the valve for a short time before the compressor on-section begins, the pressure is equilibrated in all vaporizers.

In another embodiment of the invention, the valve is switched to the open position by the control unit to delay changing the position of the other valve at the start of the compressor on-interval, and the refrigerant via the additional expansion element for a predetermined time period. Delivered to the carburetor. Thus, the refrigerant treatment to recharge the gasifier is enhanced by continuing the refrigerant flow through the additional expansion element for a certain time period.

According to the present invention, in a cooling system operating in an on / off cycle, by reducing the heating effect of the refrigerant movement occurring during the off section of the compressor, a more uniform temperature distribution in the room is provided, and at the start of the next on section, It is provided to enhance the charging of the refrigerant to the vaporizer relative to the embodiment where the refrigerant movement is completely prevented.

A cooling device implemented to meet the objects of the present invention is shown in the accompanying drawings that follow.

1 is a general view of a cooling device.

2 is a schematic diagram of an embodiment of a cooling system of the cooling apparatus of the present invention.

The components shown in the drawings have the following reference numerals.

1 cooling unit

2 compressor

3 condenser

4 inflatable elements

5 carburetor

6, 16 valve

7 additional expansion elements

8 control unit

The cooling device 1 of the present invention provides a compressor 2 which provides compression of the refrigerant, which causes the refrigerant leaving the compressor 2 as superheated liquid to condense to convert first to liquid-gas phase and then completely to liquid phase. A condenser (3), one or more vaporizers (5) for cooling the atmospheric environment by heat absorption by internal circulation of the refrigerant, an expansion element (4) for expanding and delivering the refrigerant leaving the condenser (3) to the vaporizer (5), and Preferably a bi-stable solenoid valve disposed between the condenser 3 and the expansion element 4 and blocking the refrigerant flow from the condenser 3 to the vaporizer 5 during the off period of the compressor 2 ( 6, the first valve). (Fig. 1)

The cooling device 1 has one end extending to the first valve 6 and the other end extending between the path of the carburetor 5 and an additional expansion element 7, a vaporizer which directs the direction of refrigerant movement as part of the vaporizer 5. (5) a second valve 16 disposed between the inlet and the point at which the additional expansion element 7 connects with the vaporizer 5 to separate the vaporizer 5 into two, and the compressor 2 during operation Opening the two valves 16 allows refrigerant to reach the vaporizer 5 and the compressor 2 from the condenser 3 to complete the cooling cycle and when the compressor 2 stops, the second valve 16 ), Which is intended to flow from the condenser (3) to the vaporizer (5) due to the refrigerant transfer effect, is disposed by the first valve (6) after the second valve (16) via the additional expansion element (7). To the path of the carburetor 5 and bypass the path of the carburetor 5 disposed between the first and second valves 6, 16. It is a control unit (8) for. (Figure 2)

The additional expansion element 7 is chosen to have a larger diameter and shorter length than the expansion element 4 so as to have a smaller resistance so that the pressure reduction of the refrigerant is smaller.

The first valve 6 is a bistable solenoid valve having one inlet port and two outlet ports, the inlet port extending to the condenser 3, one of the outlet ports extending to the expansion element 4 and the other Extends to the additional expansion element 7.

In this embodiment of the present invention, the control section 8 regulates the first and second valves 6, 16 in the following control manner: during the on-compressor period of the compressor 2, expansion with the expansion element 4. The port of the first valve 6 between the condenser 3 extending to the element 4 is open, the port extending to the additional expansion element 7 is closed and the refrigerant can reach the expansion element 4. However, the additional expansion element 7 cannot be reached. In this case, the second valve 16 is in the open position. Refrigerant reaching the condenser 3 by flow to the discharge line passes from the condenser 3 to the vaporizer 5 by means of the expansion element 4 and from the suction line back to the compressor 2. When the compressor 2 stops, the position of the first valve 6 is changed by the control 8, the port of the first valve 6 extending to the expansion element 4 is closed and the additional expansion element The port of the first valve 6 extending to 7 is open. At the same time, the second valve 16 is changed to the closed position by the controller 8. In this case, the refrigerant which is about to flow from the condenser 3 to the vaporizer 5 due to the refrigerant movement effect is passed through the additional expansion element 7 because the port of the first valve 6 extending to the expansion element 4 is closed. The vaporizer 5 path between the compressor 2 and the second valve 16 located at the point where the vaporizer 5 is reached and the additional expansion element 7 is connected to the vaporizer 5 is connected between the suction and discharge lines. The refrigerant is charged until the pressure is equilibrated. When the pressure between the compressor 2 suction and discharge lines is balanced, there is no refrigerant transfer effect. When the on section of the compressor 2 is started, the first and second valves 6, 16 are changed to their initial positions so that the refrigerant flow leaving the condenser 3 is directed towards the expansion element 4.

In the control method implemented by the controller 8 according to another embodiment of the present invention, the second valve 16 between the paths of the carburetor 5 is opened before the compressor 2 starts the on section, and the entire carburetor The distribution of the refrigerant for (5) is provided before the compressor 2 starts the on section. In this embodiment, since the refrigerant movement loses the heating effect after the first instant of the compressor 2 off section, the second valve 16 opens briefly before the on section starts, so that the pressure between all the vaporizer 5 paths Balance After the on-section is started, the position of the second valve 16 is changed and the refrigerant leaving the condenser 3 is directed to the expansion element 4. Directing the refrigerant to the vaporizer 5 path between the second valve 16 and the compressor 2 while preventing the refrigerant from moving will prevent an increase in temperature difference in the cooling room, resulting in a uniform temperature distribution in the room. In addition, the redistribution of the refrigerant is enhanced as compared with the case where the movement of the refrigerant is prevented.

In another embodiment of the present invention, the second valve 16 is changed to the open position by the controller 8 to delay the positional change of the first valve 6 at the start of the compressor 2 on interval, The refrigerant is delivered to the vaporizer 5 via the additional expansion element 7 for a predetermined time period.

In the present embodiment, the processing of the vaporizer 5 filled with the refrigerant is enhanced by continuously flowing the refrigerant to the additional expansion element 7 for a predetermined time interval. Since the additional expansion element 7 with lower resistance functions at the first moment of the compressor 2 on period, all the vaporizer 5 paths to the vaporizer 5 outlet can be wet for a while. After this time period, the refrigerant flow can be directed back through the expansion element 4 by opening the first valve 6.

By the present invention, the refrigerant movement is not all prevented, but instead directed to a part of the vaporizer 5. In the on / off operating cooling system, a more uniform temperature distribution in the room reduces the heating effect of the refrigerant movement occurring during the compressor 2 off period and charging the vaporizer 5 with the refrigerant at the start of the next on cycle. Provided by reinforcement.

Claims (4)

A compressor (2) providing compression of the refrigerant, a condenser (3) which causes the refrigerant leaving the compressor (2) as superheated gas to first condense into the liquid-gas phase and then completely condense into the gas phase, the refrigerant One or more vaporizers 5 for cooling the atmospheric environment by heat absorption by internal circulation of the expansion elements 4, and expansion elements 4 for expanding and transferring the refrigerant leaving the condenser 3 to the vaporizer 5, the condenser 3 And a first valve (6) disposed between the expansion element (4) and blocking the refrigerant from the condenser (3) to the vaporizer (5) during the off period of the compressor (2). In (1), An additional expansion element (7) with one end extending into the first valve (6) and the other end between the paths of the vaporizer (5), with refrigerant movement directed towards a portion of the vaporizer (5); Connected to the carburetor 5 and disposed between the inlet of the carburetor 5 and the point at which the additional expansion element 7 is connected to the carburetor 5 to separate the carburetor 5 into two parts. Two valve 16; And Opening the second valve 16 while the compressor 2 is operating allows the refrigerant to reach the vaporizer 5 and the compressor 2 from the condenser 3 to complete the cooling cycle, and By closing the second valve 16 when the compressor 2 stops, the first valve 6 causes the refrigerant to flow from the condenser 3 to the vaporizer 5 due to the refrigerant moving effect. The vaporizer 5 disposed through the additional expansion element 7 to the path of the vaporizer 5 disposed next to the second valve 16 and disposed between the first and second valves 6, 16. A control unit 8 for bypassing the path of " Cooling apparatus comprising a. The method of claim 1, Said additional expansion element (7) is selected to be larger in diameter and shorter in length than said expansion element (4), so that the pressure reduction of the refrigerant is smaller. The method of claim 1, The control section 8 opens the second valve 16 between the paths of the vaporizer 5 before the compressor 2 starts the on section and before the compressor 2 starts the on section. A cooling device, characterized in that to distribute the refrigerant to the entire vaporizer (5). The method of claim 1, The controller 8 changes the second valve 16 between the paths of the vaporizer 5 to the open position and changes the position of the first valve 6 at the start of the on section of the compressor 2. Cooling device, characterized in that for delivering the refrigerant to the vaporizer (5) via the additional expansion element (7) for a predetermined time period.

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