KR20070009081A - Apparatus for cooling refrigerant in multi-type air conditioner - Google Patents

Abstract

An apparatus for overcooling refrigerant in a multi-air conditioner is provided to bypass the refrigerant discharged from an overcooling unit to the discharge side of a compressor when the temperature of the refrigerant discharged from the overcooling unit is higher than a predetermined temperature. An apparatus for overcooling refrigerant in a multi-air conditioner includes an overcooling unit(82), a recovering pipe(87), an overheating pipe(88), and a valve(89). The overcooling unit exchanges heat with the refrigerant moved from an outdoor heat exchanger to an indoor heat exchanger to lower the temperature of the refrigerant. The recovering pipe connects a pipe on the discharge side of the overcooling unit and a pipe on the input side of an accumulator. The overheating pipe bypasses some of the refrigerant moved along the recovering pipe to a refrigerant pipe on the discharge side of a compressor. The valve is installed at a connection section of the recovering pipe and the overheating pipe to switch the passage of the refrigerant so that the refrigerant discharged from the overcooling unit can be discharged to the recovering pipe or the overheating pipe.

Description

Apparatus for cooling refrigerant in multi-type air conditioner

1 is a schematic perspective view showing a multi-type air conditioner according to a first embodiment of the present invention

2 is a block diagram showing a multi-type air conditioner according to a first embodiment of the present invention

3 is an operation diagram showing a moving flow path of the refrigerant in the outdoor unit according to the first embodiment of the present invention when the supercooling device is in a normal temperature range;

4 is an operation diagram showing a moving flow path of the refrigerant in the outdoor unit according to the first embodiment of the present invention when the supercooling device is in the overheat temperature range

5 is a configuration diagram showing an outdoor unit of the multi-type air conditioner according to the second embodiment of the present invention.

6 is a schematic configuration diagram showing an outdoor unit of a multi-type air conditioner according to the prior art;

7 is a block diagram showing a supercooling apparatus according to the prior art

<Explanation of symbols on main parts of the drawings>

11, 12, 13, 14: indoor unit 21, 22: outdoor unit

51: indoor heat exchanger 54: indoor expansion valve

61: accumulator 62: inverter compressor

63: constant speed compressor 64: oil separator

65: four-way valve 66: capillary tube

70: outdoor heat exchanger 74: outdoor electromagnetic expansion valve

80: subcooler 82: subcooler

84: bypass piping 85: check valve

86: electromagnetic expansion valve 87: recovery piping

88: overheat piping 89: valve

101, 102, 103, 104, 105, 106: temperature sensor

110: dryer 188: overheating piping

189: valve

The present invention relates to a supercooling device for a multi-type air conditioner, wherein an air conditioner for converting the refrigerant discharged from the tube cooler into the discharge side refrigerant pipe of the compressor when the temperature of the refrigerant discharged from the supercooler is higher than a normal range. Relates to a supercooling device.

6 is a schematic configuration diagram illustrating an outdoor unit of a multi-type air conditioner according to the related art.

Conventional multi-type air conditioner is composed of one or more outdoor units and a plurality of indoor units, the indoor unit and the outdoor unit is connected via a refrigerant pipe.

Here, the outdoor unit of the multi-type air conditioner according to the prior art accumulator (1) for extracting only the gas refrigerant from the refrigerant supplied from the indoor unit, a compressor (2) for receiving and compressing the gas refrigerant extracted from the accumulator (1), A four-way valve (3) connected to the compressor (2) to select a compressed flow path of the refrigerant, and an outdoor heat exchanger (4) for heat-exchanging the refrigerant supplied from the four-way valve (3) and outdoor air. .

The refrigerant heat exchanged in the outdoor heat exchanger (4) is supplied to an indoor heat exchanger (not shown) of the indoor unit through a refrigerant pipe, and a supercooling device (5) is provided between the outdoor heat exchanger (4) and the indoor heat exchanger. Is installed.

Here, when the multi-type air conditioner is driven by a cooling cycle, the supercooling device 5 cools the refrigerant moved to the indoor heat exchanger to improve efficiency.

The configuration of the supercooling apparatus is as follows.

As illustrated in FIG. 7, the subcooler 5 includes a main pipe 6 for guiding refrigerant discharged from the outdoor heat exchanger 4 to the indoor heat exchanger, and a part of the main pipe 6. A subcooler (7) installed to cover the outer periphery of the engine, a bypass pipe (8) connecting the indoor heat exchanger side main pipe (6-1) and the subcooler (7), and the bypass pipe (8). An expansion valve (9) installed in the main pipe (6-1) to expand the liquid refrigerant bypassed from the main pipe (6-1), and a bypass tube connecting the inlet side of the subcooler (7) and the accumulator ( 8-1).

Thus, the refrigerant condensed while passing through the outdoor heat exchanger (4) is moved to the outdoor heat exchanger through the subcooler (7), and some of the liquid refrigerant moved to the outdoor heat exchanger is expanded in the bypass pipe (8). By expanding through the valve (9) to cool the inside of the subcooler (7), the expanded liquid refrigerant is heat-exchanged with the main pipe (6) to cool the liquid refrigerant passing through the main pipe (6).

At this time, the expanded refrigerant inside the subcooler 7 is supplied to the accumulator 1 through the bypass pipe 8-1 and then moved to the compressor 2 again.

On the other hand, when the multi-type air conditioner is initially driven or when the temperature of the refrigerant input to the subcooling device 5 is higher than an appropriate temperature due to external conditions or the like, the subcooling device 5 is configured to transfer the liquid refrigerant to the indoor heat exchanger. Not only does it fail to cool properly, but the refrigerant flowing into the accumulator 1 through the subcooler 7 flows into a high temperature.

By the way, when the temperature of the refrigerant flowing into the accumulator 1 through the supercooling device 5 is high, the high temperature refrigerant overheats the compressor 2, resulting in damage to the compressor 2 due to overheating. There is a problem.

The present invention has been made to solve the above problems, the multi-type air conditioning configured to move the refrigerant discharged from the sub-cooler to the discharge side of the compressor when the refrigerant flowing through the sub-cooler to the accumulator side is higher than the appropriate temperature The purpose is to provide a supercooling device for the machine.

The multi-type air conditioner according to the first aspect of the present invention for solving the above technical problem is a supercooler for lowering the temperature of the moving refrigerant by heat exchange with the refrigerant moved from the outdoor heat exchanger to the indoor heat exchanger side; A recovery piping for connecting the discharge side of the subcooler and the refrigerant line at the input side of the accumulator; A superheated pipe for bypassing some of the refrigerant moved along the recovery pipe to the refrigerant pipe at the discharge side of the compressor; And a valve installed at a connection portion between the recovery pipe and the superheat pipe so as to discharge the refrigerant discharged from the supercooler to the recovery pipe or the superheat pipe.

The multi-type air conditioner according to the second aspect of the present invention comprises: a supercooler configured to lower the temperature of the moved refrigerant by exchanging heat with a refrigerant moved from an outdoor heat exchanger to an indoor heat exchanger; A recovery piping for connecting the discharge side of the subcooler and the refrigerant line at the input side of the accumulator; A superheat pipe connecting the discharge side of the supercooler and the refrigerant side discharge pipe of the compressor; It is characterized in that it comprises a valve for opening and closing the flow path of the recovery pipe or the superheated pipe, respectively installed in the recovery pipe or the superheated pipe.

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

1 is a schematic perspective view showing a multi-type air conditioner according to a first embodiment of the present invention, Figure 2 is a block diagram showing a multi-type air conditioner according to a first embodiment of the present invention, Figure 3 is In the outdoor unit according to the first embodiment of the present invention, when the supercooling device is in a normal temperature range, a moving flow path of the refrigerant is shown. The moving flow path of is the operation figure shown.

As shown in FIG. 1 or 2, the multi-type air conditioner according to the present invention includes a plurality of indoor units 11, 12, 13, 14 installed in the interior of a building, and the indoor units 11, 12. And an outdoor unit (21) 22 connected to (13) (14), and the indoor unit (11) (12) (13) (14) and the outdoor unit (21) (22) are refrigerant pipes (30) ( 40, the outdoor unit 21, 22 is driven by the request of at least one of the indoor unit 11, 12, 13, 14, the indoor unit 11, 12 ( As the cooling / heating capacity required in 13) and 14 increases, the operating number of the outdoor units 21 and 22 and the operating number of compressors installed in the outdoor units 21 and 22 increase.

Here, the indoor units 11, 12, 13, and 14 are indoor heat exchangers 51 for exchanging refrigerant and indoor air, and indoor blowers installed near the indoor heat exchangers 51 to circulate indoor air. 52 and an indoor expansion valve 54 for expanding the refrigerant flowing to the indoor heat exchanger 51 when cooling.

As illustrated in FIG. 2, the outdoor units 21 and 22 receive and compress the accumulator 61 extracting only the gas refrigerant from the refrigerant supplied from the indoor unit and the gas refrigerant extracted from the accumulator 61. The compressor 62 and 63, the four-way valve 65 connected to the compressors 62 and 63 to select a compressed flow path of the refrigerant, and the refrigerant supplied from the four-way valve 65 and the outdoor air are heat exchanged. It is configured to include an outdoor heat exchanger (70).

Here, the compressors 62 and 63 are composed of an inverter compressor 62 capable of varying the compression capacity of the refrigerant, and a constant speed compressor 63 having a constant compression capacity of the refrigerant. An oil separator 64 is installed in the pipe connecting the four-way valve 65, and the oil separator 64 is connected to the suction side of the compressor 62 and 63.

In particular, the oil separator 64 separates oil from the refrigerant discharged from the compressors 62 and 63, and supplies the separated oil to the compressors 62 and 63 to supply the compressors 62 and 63. Maintain an appropriate amount of oil inside. And the suction side pipe of the oil separator 64 and the compressor 62, 63 is connected through a capillary tube 66, the oil is moved through the capillary tube 66.

The refrigerant pipe 30 for guiding the refrigerant discharged from the outdoor heat exchanger 70 to the indoor heat exchanger 51 includes electromagnetic expansion valves lev and 74 for expanding the refrigerant upon heating, and the indoor heat exchange during cooling. The subcooling device 80 for cooling the refrigerant moved to the group 51 is provided.

Here, the outdoor electromagnetic expansion valve 74 is fully open during cooling to allow the refrigerant condensed in the outdoor heat exchanger to pass through without expansion, but when heated, the outdoor electromagnetic expansion valve 74 is opened to a predetermined size to convey the refrigerant condensed in the indoor heat exchanger 51. Before entering the outdoor heat exchanger 70 is expanded to a liquid in a spray state.

And the supercooling device 80 is a subcooler 82 is installed to surround a portion of the refrigerant pipe 30 and the refrigerant pipe 30 connected to the indoor heat exchanger 51 through the subcooler 82. Bypass (84) connected to the bypass pipe (84) for bypassing some of the refrigerant moving in the refrigerant pipe (30) into the subcooler (82), and the electromagnetic expansion valve installed in the bypass pipe (84) (86), a recovery pipe (87) connecting the subcooler (82) and the input refrigerant pipe (61 ') of the accumulator (61), the recovery pipe (87), and the compressor (62, 63). Of the refrigerant discharged from the supercooler (82) installed in the overheated pipe (88) connecting the discharge side pipe (62 ") and the recovery pipe (87) and the superheated pipe (88). It includes a valve 89 for switching in the flow direction of the refrigerant to the recovery pipe 87 or the superheated pipe 88 in accordance with the temperature It is.

Here, the subcooler 82 has a space formed therein, and the refrigerant pipe 30 is installed through the subcooler 82, and the refrigerant moved along the refrigerant pipe 30 is an air conditioner. When driven by a cooling cycle, the temperature is lowered by heat exchange with the refrigerant charged in the tube cooler 82.

To this end, the electromagnetic expansion valve 86 expands the refrigerant moved to the subcooler 82 through the bypass pipe 84 to convert into a low-temperature low-pressure liquid refrigerant in the sprayed state, the expanded refrigerant The inside of the subcooler 82 is filled with heat exchange with the refrigerant moving along the refrigerant pipe (30).

On the other hand, in order to sense the temperature of the refrigerant flowing in / out of the supercooling device 50, the discharge side refrigerant pipe (30 ") of the subcooler 30 and the electronic expansion valve in the bypass pipe (84) The temperature of the refrigerant is measured in the bypass pipe 86 " installed on the discharge side of the valve 86 and the pipe 87 'provided between the subcooler 82 and the valve 89 in the recovery pipe 87. Temperature sensors 101, 102 and 103 are provided.

In addition, the discharge side refrigerant pipes of the compressors 62 and 63 are provided with temperature sensors 104 and 105 for sensing the temperature of the refrigerant discharged from the compressors 62 and 63 and the accumulator 61. The temperature sensor 106 for sensing the temperature of the refrigerant flowing into the accumulator 61 is also installed at the input side of the refrigerant pipe.

Here, the valve 89 selects the flow direction of the refrigerant discharged in the subcooler 82 according to the temperature of the refrigerant measured by the temperature sensor 103.

That is, when the temperature of the refrigerant discharged in the supercooler 82 is maintained at a normal temperature range, the valve 89 opens a flow path through which the refrigerant is connected to the recovery pipe 87 and the superheated pipe 88 The flow path of the recovery pipe 87 is blocked to prevent damage to the compressors 62 and 63 when the temperature of the refrigerant discharged from the inside of the tube cooler 82 is higher than the normal temperature range. It cuts off and the flow path of the said superheat piping 88 is opened.

In this case, the superheat pipe 88 is provided with a check valve 85 for preventing the refrigerant discharged from the compressors 62 and 63 from flowing back to the supercooler 82.

On the other hand, the refrigerant pipe (30 ") is provided with a dryer 110 for removing moisture in the refrigerant pipe (30"), the refrigerant passing through the dryer 110 is bypassed in the refrigerant pipe (30 ") And flows to the indoor heat exchanger (51) side.

Hereinafter, the operation of the outdoor unit subcooling apparatus according to the present invention will be described in more detail with reference to FIG.

First, a case in which the coolant is operated in the supercooling device 80 of the multi-type air conditioner to form a normal temperature range is cooled. The coolant discharged from the compressors 62 and 63 passes through the four-way valve 65. The refrigerant is introduced into the outdoor heat exchanger 70 and condensed, and the refrigerant condensed in the outdoor heat exchanger 70 is moved to the subcooler 80.

Here, when the multi-type air conditioner is operated to cool, the refrigerant condensed in the outdoor heat exchanger 70 increases in efficiency of a cooling cycle as the temperature is low. The supercooling device 80 includes the condensed refrigerant in the indoor unit. The condensed refrigerant is cooled before entering (11).

Thus, some of the refrigerant passing through the subcooler 82 branched out of the refrigerant pipe 30 ″, and then expanded into a liquid refrigerant of low temperature and low pressure by an electronic expansion valve 86 installed in the bypass pipe 84. The expanded liquid refrigerant is filled in the subcooler 82.

The refrigerant filled in the subcooler 82 is heat-exchanged with the condensation refrigerant in the refrigerant pipe 30 passing through the subcooler 82 to lower the temperature of the condensation refrigerant.

On the other hand, the temperature sensor (101, 102, 103) installed in the sub-cooling device 80 senses the temperature of the refrigerant moving the sub-cooling device 80, and recovers with the sub-cooler 82 of the temperature sensor When the temperature of the coolant measured by the temperature sensor 103 installed in the pipe 87 'is within an appropriate temperature range, the valve 89 flows to allow the coolant discharged from the subcooler 82 to move to the accumulator 61. To form.

The refrigerant introduced into the accumulator 61 is moved to the compressors 62 and 63 to repeat the above-described process.

Next, as shown in FIG. 4, when the refrigerant is overheated and cooled in the supercooling device 80 of the multi-type air conditioner, the normal operation of the valve 89 is different in the normal temperature range. It is the same with the operation of the temperature range.

That is, when the temperature measured by the temperature sensor 103 is a superheated coolant exceeding an appropriate range, the valve 89 blocks a flow path formed on the accumulator 61 side, and the coolant moves to the superheated pipe 88. Switch the flow path as much as possible.

Thus, the refrigerant moved to the superheat pipe (88) is moved to the discharge side pipe (62 ") of the compressor (62, 63) and then through the four-way valve (65) again to the outdoor heat exchanger (70). do.

Here, when the superheated refrigerant flows into the accumulator 61 side, the accumulator 61 and the compressors 62 and 63 connected to the accumulator 61 are overheated by the superheated refrigerant and the compressors 62 and 63 ) Is overheated, damage due to sintering or the like occurs at the portion where the refrigerant is compressed.

Thus, the valve 89 blocks the movement of the refrigerant that is moved from the subcooler 82 to the compressors 62 and 63, and bypasses the blocked refrigerant to the indoor heat exchanger 70 to thereby provide a compressor ( 62) (63) to prevent damage.

When the passage of the superheated refrigerant is supplied to the indoor heat exchanger 70 for a predetermined time, the temperature of the supercooler 82 is gradually lowered by the electronic expansion valve 86 installed in the supercooling device 80. When the temperature of the refrigerant discharged from the supercooler 82 falls to an appropriate range, the valve 89 blocks a flow path connected to the superheated pipe 88 and opens a flow path connected to the recovery pipe 87. do.

5 is a block diagram showing an outdoor unit of the multi-type air conditioner according to the second embodiment of the present invention.

As shown in FIG. 5, the second embodiment according to the present invention is the same as the first embodiment except that the superheated pipe is not directly connected to the recovery pipe but directly connected to the supercooler.

Here, the superheat pipe 188 is directly connected to the discharge side of the supercooler 82, and the valve 189 for controlling the flow of the refrigerant is separately installed in the superheat pipe 188.

Thus, when the refrigerant discharged from the supercooler 82 has a normal temperature range, the valve 189 installed in the superheated pipe 188 is shut off, and the valve 89 provided in the recovery pipe 87 is opened.

In addition, when the temperature of the refrigerant discharged from the supercooler 82 is higher than the normal range, the valve 89 installed in the recovery pipe 87 is shut off and the valve 189 installed in the superheated pipe 188 is opened. .

Hereinafter, since the operation process according to the second embodiment is the same as the first embodiment, a detailed description thereof will be omitted.

Therefore, the supercooling apparatus of the multi-type air conditioner according to the present invention bypasses the refrigerant discharged from the subcooler to the discharge side of the compressor when the temperature of the refrigerant discharged from the subcooler is higher than an appropriate temperature range, thereby allowing a high temperature refrigerant to flow into the compressor. It is effective to prevent inflow.

Claims (4)

A supercooler configured to lower the temperature of the moved refrigerant by exchanging heat with the refrigerant moved from the outdoor heat exchanger to the indoor heat exchanger; A recovery piping for connecting the discharge side of the subcooler and the refrigerant line at the input side of the accumulator; A superheated pipe for bypassing some of the refrigerant moved along the recovery pipe to the refrigerant pipe at the discharge side of the compressor; And a valve installed at a connection portion between the recovery pipe and the superheat pipe so as to discharge the refrigerant discharged from the supercooler to the recovery pipe or the superheat pipe. Subcooler of the conditioner. The method according to claim 1, On the discharge side of the supercooler is further provided with a temperature sensor for measuring the temperature of the refrigerant flowing into the recovery pipe, the valve is a supercooling device of the multi-type air conditioner, characterized in that for switching the flow path in accordance with the temperature of the temperature sensor . The method according to claim 1 or 2, The superheating device of the multi-type air conditioner, characterized in that the check valve is further installed to prevent the refrigerant from flowing back. A supercooler configured to lower the temperature of the moved refrigerant by exchanging heat with the refrigerant moved from the outdoor heat exchanger to the indoor heat exchanger; A recovery piping for connecting the discharge side of the subcooler and the refrigerant line at the input side of the accumulator; A superheat pipe connecting the discharge side of the supercooler and the refrigerant side discharge pipe of the compressor; And a valve installed at each of the recovery pipe or the superheated pipe to open and close the flow path of the recovery pipe or the superheated pipe.

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