KR20020087801A - Fluid flowing backward prevention apparatus in refrigeration system - Google Patents

Abstract

PURPOSE: An anti-backflow device for refrigerant of refrigeration system is provided to prevent backflow of refrigerant due to difference of evaporating pressure. CONSTITUTION: A device includes a compressor(110); a condenser(115); a plurality of evaporators(145,150) installed in divided spaces and supplied with refrigerant by the condenser to evaporate; a refrigerant supply passage(113a) circulating refrigerant between the evaporators and the compressor to supply refrigerant discharged from the evaporators to the compressor with a single supply passage; and refrigerant anti-backflow valves(160,170) installed on the refrigerant supply passage to supply refrigerant passing the evaporators to the compressor without backflow.

Description

Fluid flowing backward prevention apparatus in refrigeration system

The present invention relates to a refrigerant backflow prevention device of a refrigeration system, and more particularly, when operating a plurality of evaporators using a single compressor, the refrigerant of the refrigeration system that can prevent the backflow of the refrigerant by the difference in the evaporation pressure It relates to a backflow prevention device.

Refrigerators and freezers, such as air conditioners, refrigerators, and kimchi refrigerators, operate a cooling cycle to generate the cold air required inside the equipment. The cooling cycle generates the cool air required by the device by heat exchange between the refrigerant flowing in the refrigerant passage connected to the condenser and the evaporator from the compressor to the air.

1 is a configuration diagram of a cooling cycle used in a conventional refrigeration system.

The illustrated cooling cycle is composed of one compressor 10, one condenser 15, and a plurality of evaporators 45, 50. That is, the illustrated cooling cycle is a system in which two evaporators are cooled by driving one compressor.

The compressor 10 sucks and compresses the superheated steam evaporated by the evaporators 45 and 50 to generate high temperature and high pressure superheated steam. The condenser 15 cools the superheated steam of high temperature and high pressure compressed by the compressor 10. The evaporators 45 and 50 evaporate the superheated steam cooled in the condenser 15.

Thus, the compressor 10 is connected between the plurality of evaporators 45, 50 and the condenser 15, the condenser 15 is connected between the compressor 10 and the plurality of evaporators 45, 50, The evaporators 45 and 50 are connected between the compressor 10 and the condenser 15. In addition, the compressor 10 is connected to the condenser 15 by one refrigerant passage 13e, and the different refrigerant passages 13c and 13d are connected from the condenser 15 to each of the evaporators 45 and 50. In addition, the plurality of evaporators 45 and 50 to the compressor 10 are formed by one refrigerant passage 13a.

Therefore, the refrigerant passing through the evaporator 45 and the refrigerant passing through the other evaporator 50 are one refrigerant passage 13a connected to the compressor 10 from the rear end of the evaporators 45 and 50. The cooling cycle is configured to flow through.

A stepping motor valve 25 is provided between the condenser 15 and the plurality of evaporators 45 and 50 to open and close the refrigerant supply passage according to whether each evaporator is operated. It is possible to control to open only one side or both sides.

In addition, expansion devices (35, 40) for controlling the pressure of the refrigerant flowing into the evaporator (45, 50) is installed, the refrigerant flow passage connected between the evaporator (45, 50) and the compressor ( An accumulator 47 for preventing the inflow of the liquid refrigerant to the compressor 10 and for controlling the cooling speeds is provided at 13a).

That is, the cooling cycle configured in the conventional refrigeration system is the compressor 10 → condenser 15 → stepping motor valve 25 → expansion device 35 → evaporator 45 → accumulator 47 → again. The refrigerating chamber connected to the compressor 10, the compressor 10 → condenser 15 → stepping motor valve 25 → expansion device 40 → evaporator 50 → accumulator 47 → and the compressor 10 again. It is equipped with the refrigerator compartment connected by). And code 20 shows the fan.

Next will be described the operation of the cooling cycle of the conventional refrigeration system having the above configuration.

As shown, the cooling cycle consists of one compressor 10 and two evaporators 45 and 50 that operate separately. Therefore, the refrigerant compressed by the compressor 10 is supplied to the two evaporators 45 and 50 side by side.

That is, when performing control for cooling the first refrigerating chamber, only one side of the stepping motor valve 25 is opened to open the refrigerant supply passage between the condenser 15 and the evaporator 45. In this operation, the coolant cooled in the condenser 15 is supplied to the evaporator 45 side, and thus the cool air required in the first refrigerating chamber is created.

In addition, when performing the control for cooling the second refrigerating compartment, only the other side of the stepping motor valve 25 is operated to open the refrigerant supply passage between the condenser 15 and the evaporator 50. In this case, as the refrigerant cooled in the condenser 15 is supplied to the evaporator 50 side, cold air required in the second refrigerating chamber is created.

However, the first and second refrigerating chambers are not always separately cooled, and sometimes the first and second refrigerating chambers require a cooling function at the same time. At this time, both of the stepping motor valves 25 are opened, and the refrigerant passing through the condenser 15 is supplied to the two evaporators 45 and 50.

In this case, when the loads in the first and second refrigerating chambers act almost the same, the pressure of the refrigerant supplied to the first refrigerating compartment and the pressure of the refrigerant supplied to the second refrigerating compartment are almost equal to each other, thereby enabling a smooth evaporation action.

However, when the loads in the first and second refrigerating chambers act differently, a refrigerant backflow phenomenon occurs in which the refrigerant flows back from the higher evaporation pressure to the lower evaporation pressure due to the difference in the evaporation pressures of the evaporators 45 and 50. In this case, even if the refrigerator compartment with a low evaporation pressure performs the freezing function normally, the refrigerator compartment with a high evaporation pressure fails to perform a proper refrigeration / freezing function as the cooling rate is reduced due to the refrigerant shortage caused by the refrigerant flow. .

Accordingly, an object of the present invention is to provide a refrigeration system for preventing reflux of a refrigeration system, which can prevent a backflow of a refrigerant due to a difference in evaporation pressure when cooling a plurality of evaporators by one compressor.

1 is a configuration diagram of a refrigeration system according to the prior art,

2 is a configuration diagram of a refrigerant backflow prevention apparatus of a refrigerating system according to a first embodiment of the present invention;

3 is a block diagram of a refrigerant backflow prevention device of a refrigerating system according to a second embodiment of the present invention;

4 is a configuration diagram of a refrigerant backflow prevention device of a refrigerating system according to a third embodiment of the present invention;

5 is a configuration diagram of a refrigerant backflow prevention device of a refrigerating system according to a fourth embodiment of the present invention;

6 is a block diagram of a refrigerant backflow prevention device of a refrigerating system according to a fifth embodiment of the present invention;

7 is a block diagram of a refrigerant backflow prevention device of a refrigeration system according to a sixth embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10,110,210,310,410,510,610: Compressor

15,115,215,315,415,515,615: condenser

20,120,220,320,420,520,620: Fan

25,125,225,325,425,525,625: Stepping Motor Valve

35,40,135,140,235,240,335,340,435,440,535,540,635,640: Expansion device

45,50,145,150,245,250,345,350,445,450,545,550,645,650: Evaporator

160,170,260,360,460,470,560,660,670: Refrigerant check valve

47,147,247,347,447,547,647: Accumulator

Refrigerant backflow prevention device of the refrigerator according to the present invention for achieving the above object, one compressor; One condenser; A plurality of evaporators which are respectively installed in separate spaces and receive refrigerant from the condenser and evaporate; A refrigerant supply passage circulating a refrigerant through one passage between the plurality of evaporators and the one compressor; And a refrigerant check valve installed on the refrigerant supply passage so that the refrigerant passing through the plurality of evaporators is supplied to the compressor without a back flow.

The refrigerant backflow check valve of the present invention is characterized in that it is provided on the side of the evaporator having a low evaporation pressure.

The refrigerant backflow check valve of the present invention is characterized in that it is installed at the rear end of all evaporators.

The refrigerant supply passage of the present invention is characterized in that an accumulator for preventing the introduction of liquid refrigerant to the compressor is installed.

The present invention is characterized in that a stepping motor valve is installed between the condenser and the plurality of evaporators to selectively open and close the supply of the refrigerant.

The present invention further comprises an expansion device for adjusting the evaporation pressure between the stepping motor valve and the plurality of evaporators.

Hereinafter, with reference to the accompanying drawings will be described in detail a refrigerant backflow prevention device for a refrigeration system according to the present invention.

2 is a block diagram of a refrigerant backflow prevention device of a refrigerating system according to a first embodiment of the present invention.

The first embodiment of the present invention is composed of one compressor 110, one condenser 115, and a plurality of evaporators 145, 150. That is, the cooling cycle of the present invention is a system in which two evaporators are cooled by driving one compressor. The first evaporator 145 is installed in the refrigerating chamber, and the second evaporator 150 is installed in the freezing chamber. That is, the first and second evaporators 145 and 150 have different loads according to the capacity, the internal food, the set temperature inside the refrigerator, and the like.

The compressor 110 sucks and compresses the superheated steam evaporated by the evaporators 145 and 150 to generate high temperature and high pressure superheated steam. The condenser 115 cools the heated steam of the high temperature and high pressure compressed by the compressor 110. The evaporators 145 and 150 evaporate the heated steam cooled in the condenser 115.

Accordingly, the compressor 110 is connected between the plurality of evaporators 145 and 150 and the condenser 115, and the condenser 115 is connected between the compressor 110 and the plurality of evaporators 145 and 150, and the evaporators 145 and 150. ) Is connected between the compressor 110 and the condenser 115.

In this case, a refrigerant supply passage 113e is formed from the compressor 110 to the condenser 115, and separate refrigerant supply passages 113c and 113d are formed from the condenser 115 to the plurality of evaporators 145 and 150. In addition, one refrigerant supply passage 113a is formed from the plurality of evaporators 145 and 150 to the compressor 110. That is, the present invention is configured such that the refrigerant discharged from the plurality of evaporators is supplied to the compressor through one supply passage.

In addition, a stepping motor valve 125 is provided between the condenser 115 and the plurality of evaporators 145 and 150 to open and close the refrigerant supply passage according to whether each evaporator is operated. The stepping motor valve 125 is a three-way valve having one inlet and two outlets, and it is possible to open the two outlets simultaneously or selectively.

In addition, expansion devices 135 and 140 for controlling pressure of the refrigerant flowing into the evaporators 145 and 150 are installed.

In addition, the present invention is installed on the discharge port side of each of the evaporator (145,150) in order to prevent the back flow of the refrigerant due to the difference in the evaporation pressure, the refrigerant flow back check valve (160, 170) is installed so that the flowing refrigerant can be moved only in one direction have.

In the embodiment of the present invention, the coolant check valve is installed at the outlet of the evaporator. However, if the coolant flow can be controlled in only one direction, the coolant check valve may be installed at another position on the coolant supply passage 113a.

On the refrigerant supply passage 113a, an accumulator 147 is installed in the compressor 110 to prevent inflow of liquid refrigerant.

That is, the cooling cycle used in the refrigerating system of the present invention is a compressor 110 → condenser 115 → stepping motor valve 125 → expansion device 135 → evaporator 145 → backflow prevention valve 170 → The refrigeration chamber connected to the accumulator 147 and the compressor 110 again, the compressor 110 → condenser 115 → stepping motor valve 125 → expansion device 140 → evaporator 150 → check valve ( 160) an accumulator 147 and a freezer compartment connected to the compressor 110 again. And reference numeral 120 shows a fan.

The following describes the operating state of the cooling cycle of the refrigerating system according to the present invention having the above configuration.

In order to supply cold air to the refrigerating compartment, the stepping motor valve 125 must first be controlled to be opened to the evaporator 145 side. Thereafter, the refrigerant compressed at high temperature and high pressure according to the operation of the compressor 110 is sucked into the condenser 115 and cooled. The refrigerant cooled in the condenser 115 flows to the expansion device 135 through the refrigerant supply passage 113c because the stepping motor valve 125 is controlled to be opened.

The expansion device 135 adjusts the refrigerant discharged from the condenser 115 to a pressure and a flow rate in a good state to evaporate and delivers the refrigerant to the evaporator 145. The evaporator 145 sucks the refrigerant whose pressure is controlled by the expansion device 135 to perform heat exchange between the refrigerant and air through an evaporation action, and the refrigerant thus exchanged through the refrigerant supply passage 113a. Return to the compressor (110) side.

On the other hand, since the non-return valve 170 provided on the discharge port side of the evaporator 145 is in a state where the evaporator 150 of the freezer compartment does not operate, a backflow of the refrigerant occurs from the freezer compartment side to the refrigerating compartment side. There is no risk of this, but it will prevent any possible backflow of the refrigerant.

In addition, the backflow prevention valve 160 installed at the rear end of the evaporator 150 of the freezer compartment prevents the refrigerant from the evaporator 145 from flowing into the evaporator 150 side of the freezer compartment.

Through the above process, the refrigerant discharged from the compressor 110 is cooled in the condenser 115, the pressure is adjusted in the expansion device 135, and then cold cold air is supplied to the refrigerating chamber through the process of evaporating in the evaporator 145. It is done.

In addition, the cooling operation of the freezer compartment is similar to the above process. In this case, only the evaporator 150 is operated to generate cold air to be supplied to the freezer compartment, and the stepping motor valve 125 is controlled to be opened to the evaporator 150 side for supply of the refrigerant to the evaporator 150. different.

On the other hand, when the freezer compartment and the refrigerating compartment simultaneously perform the cooling operation, the stepping motor valve 125 opens both outlets so that refrigerant can be supplied to the evaporator 150 of the freezer compartment side and the evaporator 145 of the refrigerating compartment side. Control by state.

When the refrigerant is supplied from the condenser 115 to the evaporator 145 and the condenser 115 to the evaporator 150 by such control, the high set temperature of the freezer compartment and the refrigerating compartment, the food inserted in the refrigerator, the capacity of the other evaporator, etc. Therefore, a case in which loads on the two evaporators 145 and 150 behave differently occurs.

At this time, while the loads of the freezer compartment and the refrigerating compartment act differently, the evaporation pressure of the evaporator 145 of the refrigerating compartment and the evaporator 150 of the freezer compartment are different. Usually, in this case, the phenomenon that the refrigerant of the high pressure side evaporator tries to flow to the low pressure side evaporator side occurs.

However, in the first exemplary embodiment of the present invention, the non-return valves 170 and 160 are provided at the rear ends of the evaporators 145 and 150, respectively. Therefore, even though both evaporation pressures act differently, the refrigerant discharged from the evaporator 145 by the non-return valve 160 is prevented from flowing into the evaporator 150 side and flows only to the compressor 110 side. The refrigerant discharged from the evaporator 150 by the non-return valve 170 is prevented from flowing into the evaporator 145 side and flows only to the compressor 110 side. That is, since the non-return valve allows the refrigerant to flow only in one direction, no refrigerant flow in the reverse direction occurs.

Therefore, each of the two evaporators 145 and 150 prevents the backflow of the refrigerant from the higher evaporation pressure to the lower evaporation pressure, and performs cooling operation appropriately by the supplied refrigerant, thereby generating cold air required in the refrigerator. Done.

In the first embodiment of the present invention, the refrigerant backflow check valves 170 and 160 are provided at the discharge port side of each of the evaporators 145 and 150. Therefore, even if the evaporation pressure of any evaporator is high or low depending on the load conditions of the refrigerating chamber and the freezing chamber, it is possible to prevent the backflow of the refrigerant by the refrigerant check valve.

Next, Figure 3 is a block diagram of a refrigerant backflow prevention device of a refrigeration system according to a second embodiment of the present invention.

In the second embodiment of the present invention, the refrigerant backflow check valve is mounted only on any one of the evaporators installed in the freezer compartment and the refrigerating compartment.

In such a case, the non-return valve 260 is provided on the lower side of the evaporation pressure. That is, when the internal loads of the freezer compartment and the refrigerating compartment act differently, it is possible to prevent the refrigerant flowing in the high pressure side evaporator 245 even if it flows toward the low pressure side evaporator 250. Accordingly, the refrigerant flow back from the high pressure side evaporator to the low pressure side evaporator is prevented by the refrigerant backflow check valve 260 provided on the low pressure side.

That is, the refrigerant discharged from the high pressure side evaporator 245 is blocked by the refrigerant backflow prevention valve 260 and does not flow to the low pressure side evaporator 250, but the compressor 210 passes through the accumulator 247. Only flows.

Therefore, according to the second embodiment of the present invention, the non-return valve 260 is installed at the lower evaporation pressure, and the refrigerant at the higher evaporation pressure is prevented from flowing back to the lower evaporation pressure. It is possible to prevent the cooling rate decrease due to the shortage phenomenon.

In general, the evaporation pressure of each evaporator can be adjusted by the expansion devices 235 and 240 provided at the suction port side of the evaporators 245 and 250. The evaporation pressure of each evaporator is also determined by the capacity of the evaporator. Therefore, the evaporation pressure can be adjusted by the evaporator's capacity or the length and / or width of the expansion device installed on the cold air supply passage. Therefore, according to the second embodiment of the present invention, the refrigerant backflow check valve 260 is provided on the side where the evaporation pressure is low according to a preset value.

That is, as shown in Fig. 3, the second embodiment of the present invention sets the evaporation pressure of the refrigerating chamber higher than that of the freezing chamber. Therefore, the refrigerant backflow check valve 260 is installed at the rear end of the evaporator 250 of the freezer compartment.

Next, Figure 4 is a block diagram of a refrigerant backflow prevention device of a refrigeration system according to a third embodiment of the present invention. The first and second embodiments described above describe a case in which two evaporators which are installed in a space separated place are installed in one refrigerating compartment and the other in the freezing compartment.

However, the third and fourth embodiments of FIG. 4 and the fourth embodiment of FIG. 5 are spaced apart to prevent refrigerant backflow due to a difference in evaporation pressure in a system operated as a freezer compartment.

That is, the third embodiment shown in FIG. 4 is configured to install the refrigerant backflow check valve 360 only at the rear end of the evaporator 350 having a low evaporation pressure among the evaporators installed in the plurality of freezer compartments. And the fourth embodiment shown in Figure 5 is a configuration in which the refrigerant check valves 470, 460 are provided at the rear end of the evaporator installed in all the freezer compartment.

In the fifth embodiment shown in FIG. 6, the backflow prevention is prevented only at the rear end of the evaporator 550 having a low evaporation pressure in order to prevent refrigerant backflow due to a difference in evaporation pressure in a system operated as a refrigerating chamber. It is the structure in which the valve 560 is provided. In the sixth embodiment shown in FIG. 7, the refrigerant backflow check valves 670 and 660 are located at the rear ends of all the evaporators 645 and 650 in order to prevent the refrigerant backflow due to the difference in the evaporation pressure in the system operated as the refrigerating chamber, although the spaces are separated. ) Is installed.

According to the present invention as described above, in the system for cooling two evaporators using one compressor, the refrigerant backflow phenomenon may occur in the evaporator refrigerant of the high pressure side to the evaporator side of the low pressure side, so this evaporation pressure difference It can be seen that the basic technical idea is to prevent the backflow phenomenon of the refrigerant and to solve the shortage of the refrigerant.

And within the scope of the technical idea of the present invention, of course, various modifications are possible to those skilled in the art.

According to the present invention as described above, it will be appreciated that the following advantages can be provided.

The refrigeration system of the refrigeration system of the refrigeration system according to the present invention, in the cooling cycle for cooling two evaporators using one compressor, to prevent the backflow of the refrigerant due to the evaporation pressure difference, thereby reducing the cooling rate due to the lack of refrigerant I can solve it.

Therefore, the present invention is expected to minimize the cooling cycle imbalance in the refrigeration system, to enable the appropriate load response.

Claims (6)

One compressor; One condenser; A plurality of evaporators which are respectively installed in separate spaces and receive refrigerant from the condenser and evaporate; A refrigerant supply passage circulating a refrigerant through one passage between the plurality of evaporators and the one compressor; And a refrigerant check valve installed on the refrigerant supply passage so that the refrigerant passing through the plurality of evaporators is supplied to the compressor without a back flow. The method of claim 1 wherein: The refrigerant backflow prevention valve is a refrigerant backflow prevention device of a refrigeration system, characterized in that installed on the side of the evaporator low evaporation pressure. The method of claim 1 wherein: The refrigerant backflow check valve, the refrigerant backflow prevention device of the refrigeration system, characterized in that installed in the rear end of all evaporators. The method according to claim 1, wherein: The refrigerant supply flow path, the refrigeration system of the refrigeration system of the refrigeration system, characterized in that the accumulator for preventing the introduction of the liquid refrigerant in the compressor. The method of claim 4 wherein: And a stepping motor valve for selectively opening and closing the supply of the refrigerant between the condenser and the plurality of evaporators. The method of claim 5 wherein: Between the stepping motor valve and a plurality of evaporators, the refrigeration system of the refrigeration system of the refrigeration system further comprises an expansion device for adjusting the evaporation pressure.