KR20070054948A - Air conditioner and therefor control process - Google Patents

Abstract

In the air conditioner according to the present invention, a bypass pipe for connecting the suction / discharge side of the constant speed compressor installed with the inverter compressor is installed, and a valve is installed in the bypass pipe to open the valve when the constant speed compressor is stopped. Not only can the pressure difference on the suction / discharge side be quickly balanced, but when the inverter compressor and the constant speed compressor are operated and the constant speed compressor is stopped, the valve is opened to quickly adjust the pressure difference between the discharge side and the suction side of the constant speed compressor. By reducing, there is an effect of shortening the time that the constant speed compressor is restarted.

Description

Air conditioner and therefor control process

1 is a schematic perspective view of 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 a block diagram showing an outdoor unit of the multi-type air conditioner according to the first embodiment of the present invention.

4 is a block diagram showing an indoor unit of the air conditioner according to the second embodiment of the present invention

5 is a block diagram showing a multi-type air conditioner according to the prior art

<Explanation of symbols on main parts of the drawings>

11, 12, 13, 14: indoor unit 21, 22, 23: 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

68: constant speed compressor 68a: suction side piping

68b: discharge side piping 70: outdoor heat exchanger

74: outdoor electronic expansion valve 80: supercooling device

90: liquid injection device 100: the first bypass unit

102: bypass piping 104: valve

110: second bypass unit 112: bypass piping

114: valve

The present invention relates to an air conditioner, comprising a bypass pipe connecting the suction side and the discharge side of a constant speed compressor, and installing a valve in the bypass pipe, opening the valve when the constant speed compressor is started or restarted. It relates to an air conditioner for quickly eliminating the pressure difference on the discharge side.

5 is a block diagram showing a multi-type air conditioner according to the prior art.

In the multi-type air conditioner according to the related art, as illustrated in FIG. 5, a plurality of outdoor units 1, 2, 3 and a plurality of indoor units are connected through a refrigerant pipe, and the outdoor units 1, 2, ( 3) at least one is driven corresponding to the load of the indoor unit.

Here, the outdoor unit 1 includes an accumulator 4 for extracting only the gas refrigerant from the refrigerant supplied from the indoor unit, a compressor 5 and 6 for receiving and compressing the gas refrigerant extracted from the accumulator 4, and the compressor. (5) and a four-way valve (7) connected to (6) to select the compressed refrigerant flow path, and an outdoor heat exchanger (8) for heat-exchanging the refrigerant supplied from the four-way valve (7) and outdoor air do.

Here, the compressor (5) (6) is composed of an inverter compressor (5) capable of varying the discharge capacity of the refrigerant and a constant speed compressor (6) for discharging only a predetermined amount of refrigerant, the remaining outdoor unit (2) ( 3), unlike the outdoor unit 1, two constant speed compressors 6 are installed.

In particular, the inverter compressor 5 is responsible for 70% of the total refrigerant compression capacity of the outdoor unit 1, and the constant speed compressor 6 is responsible for the remaining 30%.

Here, the operation sequence of the outdoor unit in the conventional multi-type air conditioner is as follows.

First, when any one of the plurality of indoor units is driven, the first outdoor unit 1 equipped with the inverter compressor 5 is driven, and when the cooling / heating capacity required by the indoor unit is increased, the remaining compressor ( 6) or the outdoor unit 2, 3 is driven.

That is, the inverter compressor 5 is configured to be driven first regardless of which indoor unit is driven to correspond to the cooling / heating load of the indoor unit.

When the air / heating load required by the indoor unit exceeds the inverter compressor 5, the constant speed compressor 6 of the constant speed compressor 6 of the first outdoor unit 1 or the remaining outdoor units 2, 3 is provided. Is driven to replace the compression capacity of the inverter compressor (5), and the inverter compressor (5) is down to the lowest compression capacity, and the inverter compressor (5) again when the cooling / heating capacity of the indoor unit is further increased. Increases the compression capacity again in response to the cooling / heating capacity.

However, in the multi-type air conditioner according to the prior art, when the constant speed compressor 6 is started or the constant speed compressor 6 is stopped and started again when the inverter compressor 5 is in operation, the constant speed compressor 6 There is a problem in that the constant speed compressor 6 is damaged due to the pressure difference between the discharge side and the suction side.

Thus, the multi-type air conditioner according to the prior art has a delay of at least 10 minutes when the constant speed compressor 6 is stopped and then turned on again during the operation of the inverter compressor 5, so that the discharge side and the suction side of the constant speed compressor 6 Causes the pressure difference to form within 2 atmospheres.

However, if the delay is formed in the constant speed compressor 6 as described above, the air conditioner may not immediately respond to the demand of the user by the user's request, and thus may not meet the consumer's expectations, and the inverter may be operated until the constant speed compressor 6 is operated. There is a problem that the load is concentrated on the compressor 5 and the reliability of the inverter compressor 5 is sharply lowered.

The present invention has been made to solve the above problems, by installing a bypass pipe connecting the suction side and the discharge side of the constant speed compressor and by installing a valve in the bypass pipe, when the constant speed compressor is started or restarted It is an object of the present invention to provide an air conditioner that opens the valve to quickly eliminate the pressure difference on the suction / discharge side.

An air conditioner according to a first aspect of the present invention for solving the above technical problem is an inverter compressor for varying the compression capacity of the refrigerant; At least one constant speed compressor for compressing a refrigerant of a predetermined capacity; A bypass pipe connecting the discharge side and the suction side of the constant speed compressor; It is provided to the bypass pipe is configured to include a valve for opening and closing the bypass pipe.

A control method of an air conditioner according to a second aspect of the present invention includes an inverter compressor for varying a compression capacity of a refrigerant; A plurality of constant speed compressors for compressing a predetermined amount of refrigerant; Respective bypass pipes connecting the discharge side and the suction side of each of the constant speed compressors; It is installed in each bypass pipe, and comprises a valve for opening and closing the bypass pipe by a control unit, the control unit is characterized in that for opening the respective valves when the inverter compressor is in operation.

Here, when the inverter compressor is in operation and at least one of the constant speed compressors is started, the controller closes a valve installed in the constant speed compressor that is started.

Particularly, when only one of the inverter compressor and the constant speed compressor is in operation and the other constant speed compressor is stopped, the control unit maintains the valve installed in the constant speed compressor in operation in a closed state, and the valve installed in the constant speed compressor is stopped. Switch to open.

A control method of an air conditioner according to a third aspect of the present invention includes an inverter compressor for varying a compression capacity of a refrigerant; A constant speed compressor for compressing a refrigerant having a predetermined capacity; A bypass pipe connecting the discharge side and the suction side of the constant speed compressor; And a valve installed in the bypass pipe and configured to open and close the bypass pipe by a controller, wherein the controller opens the valve when the inverter compressor is in operation.

Here, when the inverter compressor is in operation and the constant speed compressor is started, the control unit closes the valve.

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, FIG. 2 is a block diagram showing a multi-type air conditioner according to a first embodiment of the present invention, and FIG. 1 is a block diagram illustrating an outdoor unit of a multi-type air conditioner according to an embodiment.

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 (23) connected to (13) (14), wherein the indoor unit (11) (12) (13) (14) and the outdoor unit (21) (22) (23) It is connected through the refrigerant pipes 30, 40, the outdoor unit 21, 22, 23 is driven by the request of at least one of the indoor unit (11) 12 (13) (14), As the air / heating capacity required by the indoor units 11, 12, 13, 14 increases, the number of operations of the outdoor units 21, 22, 23 and the outdoor units 21, 22, 23 are increased. The operating number of the compressor installed in the is increased.

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.

The outdoor units 21, 22, and 23 are configured as first, second, and third outdoor units 21, 22, and 23, as shown in FIG. 2 or 3, and the refrigerant supplied from the indoor unit. Accumulator 61 for extracting only the gaseous refrigerant, and compressors 62, 63, 67 for receiving and compressing the gaseous refrigerant extracted from the accumulator 61 are connected to the compressors 62 and 63. It comprises a four-way valve (65) for selecting the flow path of the compressed refrigerant, and an outdoor heat exchanger (70) for heat-exchanging the outdoor air with the refrigerant supplied from the four-way valve (65).

Here, the first outdoor unit 21 is provided with an inverter compressor 62 and a constant speed compressor 63, and the second and third outdoor units 22 and 23 are provided with only a plurality of constant speed compressors 67, and the inverter compressor. Reference numeral 62 denotes a compressor capable of varying the compression capacity of the refrigerant, and the constant speed compressors 63 and 67 are compressors having a constant compression capacity of the refrigerant.

In addition, the inverter compressor 62 is responsible for 70% of the compression capacity of the first outdoor unit 21, the constant speed compressor 63 installed in the first outdoor unit 21 is responsible for the remaining 30%, the remaining outdoor unit 22 The constant speed compressor (67) of the (23) is responsible for a compression capacity of 50% each.

On the other hand, an oil separator 64 is installed in a pipe connecting the compressors 62 and 63 and the four-way valve 65, and the oil separator 64 is provided at the suction side of the compressors 62 and 63. Connected.

In addition, a pressure sensor 107 is installed between the oil separator 64 and the compressors 62, 63, 67 to sense the pressure of the refrigerant discharged from the compressors 62, 63, 67.

In particular, the oil separator 64 separates oil from the refrigerant discharged from the compressors 62, 63, 67, and supplies the separated oil to the compressors 62, 63, 67. An appropriate amount of oil is maintained inside the (62) (63) (67). And the suction side pipe of the oil separator 64 and the compressor 62, 63, 67 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. Sub-cooling device 80 for cooling the refrigerant moved to the machine 51, and a liquid injection device 90 for lowering the temperature of the compressor (62, 63) 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.

On the other hand, the refrigerant pipe (30 ") is provided with a dryer (200) for removing moisture in the refrigerant pipe (30"), the refrigerant passing through the dryer 200 is a by-pass in the refrigerant pipe (30 ") Passed and flow to the indoor heat exchanger (51) side.

In addition, the outdoor unit 21, 22, 23 includes a bypass unit 100 for quickly relieving the pressure difference between the constant speed compressors 63 and 67 when the constant speed compressors 63 and 67 are started or restarted. This is installed.

The bypass unit 100 includes a bypass pipe 102 connecting the discharge side pipes 63b and 67b and the suction side pipes 63a and 67b of the constant speed compressors 63 and 67, and the bypass pipe 102. It is configured to include a valve 104 installed in the pass pipe 102 to open and close the bypass pipe 102.

Thus, one end of the bypass pipe 102 is located between the accumulator 61 and the constant speed compressor 63, 67, and the other end is between the constant speed compressor 63, 67 and the oil separator 64. Is located.

And the valve 104 is controlled by a current applied from the control unit is provided with a solenoid valve for opening and closing the bypass pipe (102).

Hereinafter, the operation of the outdoor unit according to the present invention will be described in more detail with reference to FIG. 3.

First, when the multi-type air conditioner according to the present invention is driven in a cooling cycle, the compressors 62 and 63 receive gas refrigerant from the accumulator 61 and compress them, and the refrigerant discharged from the compressors 62 and 63 is The refrigerant flows into the outdoor heat exchanger 70 through the four-way valve 65 and condenses, and the refrigerant condensed in the outdoor heat exchanger 70 is moved to the supercooling device 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 lower. The supercooling device 80 is configured to provide the condensed refrigerant to the indoor unit. The condensed refrigerant is cooled before entering (11).

The refrigerant passing through the supercooler 80 is moved along the refrigerant pipe 30 ″ and sprayed in a liquid state to the expansion valve 54 installed in the indoor units 11, 12, 13, and 14, and indoors. The heat exchanger 51 exchanges heat with the indoor air to evaporate the gas, and the evaporated refrigerant is again moved through the refrigerant pipe 40 and introduced into the accumulator 61.

On the other hand, the compressors 62, 63, 67 of the outdoor units 21, 22, 23 operate according to the demands of the indoor units 11, 12, 13, 14, and in accordance with the load of the room. Inverter compressor 62 or constant speed compressors 63 and 67 are operated.

Thus, when the load required by the indoor indoor unit is small, only the inverter compressor 62 is operated, and the constant speed compressor 63 is also started together with the inverter compressor 62 as the indoor load increases, and according to the increase or decrease of the indoor load. The operation and stop of the constant speed compressors 63 and 67 are repeated.

Here, the control unit for controlling the air conditioner controls the bypass unit 100 installed in the constant speed compressors 63 and 67 to solve the suction / discharge side pressure difference of the constant speed compressors 63 and 67.

The constant speed compressors 63 and 67 are added and operated when the inverter compressor 62 is operated, and the inverter compressor 62 is always in operation when the constant speed compressors 63 and 67 are activated.

Thus, when the constant speed compressor 63 is stopped, the control unit opens the valve 104 of the bypass pipe 102 to suck the discharge side pipes 63b and 67b of the constant speed compressors 63 and 67. The side pipes 63a and 67a are connected to each other, and the valve 104 is closed when the constant speed compressors 63 and 67 are started or operated.

That is, before the constant speed compressors 63 and 67 are started, the valve 104 is opened to allow the refrigerant to communicate through the bypass pipe 102, thereby reducing the pressure difference between the suction and discharge pipes. When minimized and the addition of room increases, the constant speed compressors 63 and 67 can be activated immediately.

Even when the constant speed compressors 63 and 67 are stopped during operation, the valve 104 is opened so that the refrigerant in the discharge side pipes 63b and 67b moves to the suction side pipes 63a and 67a. This allows the pressure on the discharge side, which has risen to high pressure, to be quickly balanced with the pressure on the suction side.

Thus, when the constant speed compressors 63 and 67 are restarted, the suction / discharge side pressure difference of the constant speed compressors 63 and 67 is quickly formed within 2 atmospheres by the operation of the bypass unit 100, and the constant speed The delay time required for the compressor 63, 67 to restart is minimized.

In particular, when the constant speed compressor is restarted during the operation of the inverter compressor as in the related art, it takes more than 10 minutes to form the pressure difference between the suction / discharge side of the constant speed compressor within 2 atm, but the bypass unit 100 as in the present invention. In the case where) is operated, it takes an effect of less than 5 minutes to form the suction / discharge-side pressure difference within 2 atmospheres.

On the other hand, when the constant speed compressor (63) (67) is started and operated, the bypass pipe 102 of the bypass unit 100 is closed by the valve 104, the constant speed compressor (63) (67) Blocks the refrigerant discharged from the flow to the suction side.

4 is a block diagram illustrating an indoor unit of an air conditioner according to a second embodiment of the present invention.

In the second embodiment, two first and second constant speed compressors 63 and 68 are installed in the indoor unit 21 of the first embodiment, and first and second constant speed compressors 62 and 68 are respectively provided. , 2 bypass unit 100, 110 is the same as the first embodiment except that.

Hereinafter, the operation of the outdoor unit according to the second embodiment will be described in more detail with reference to FIG. 4.

First, when only the inverter compressor 62 is operated, and both the first and second constant speed compressors 62 and 68 are stopped, the valve 104 of the bypass unit 100 is kept open to maintain the constant speed. The suction / discharge side refrigerants of the compressors 62 and 68 are in communication with each other, and when the load in the room is increased, any one of the constant speed compressors 62 and 68 can be operated immediately.

Next, when the load in the room is increased and the first constant speed compressor 63 is operated together with the inverter compressor 62, the control unit is configured to open the first bypass of the first constant speed compressor 63. The pass unit 100 is switched to the closed state, and the second bypass unit 110 of the second constant speed compressor 68 is kept open.

Thus, when the first constant speed compressor 63 is operated together with the inverter compressor 62, the first constant speed compressor 63 is operated in response to a signal of the controller.

Next, while the inverter compressor 62 and the first constant speed compressor 63 are in operation and the first constant speed compressor 63 is stopped due to a decrease in an indoor load, the control unit may control the first constant speed compressor ( By operating the valve 104 of the first bypass unit 100 installed in the (63) to open the closed bypass pipe 102, the opening of the valve 104 of the first constant speed compressor (63) The pressures on the discharge and suction refrigerants quickly equilibrate.

Thus, the first constant speed compressor 63 is quickly balanced by the first bypass unit 100, and is quickly returned to the pressure difference where the first constant speed compressor 63 may be restarted.

On the other hand, if the load in the room increases while the inverter compressor 62 and the first constant speed compressor 63 are operated, the second constant speed compressor 68 is further operated, and the second constant speed compressor 68 According to the operation, the control unit operates the second bypass unit 110 installed in the second constant speed compressor 68.

The control unit closes the bypass pipe 112 by sending a signal to the valve 114 of the second bypass unit 110 simultaneously with the operation of the second constant speed compressor 68.

When at least one of the first constant speed compressor 63 or the second constant speed compressor 68 is stopped and the load of the room is reduced, the controller is configured to bypass the bypass units 100 and 110 of the stationary constant speed compressor. Operate valves 104 and 114 to open bypass piping 102 and 112.

Thus, the air conditioner according to the second embodiment allows the intake / discharge side pressure difference of the stationary constant speed compressors 63 and 68 to be quickly balanced, so that when the indoor load is increased, the first or the corresponding air conditioner increases. 2 Allow constant speed compressors 63 and 68 to operate immediately.

In the air conditioner according to the present invention, a bypass pipe for connecting the suction / discharge side of the constant speed compressor installed with the inverter compressor is installed, and a valve is installed in the bypass pipe to open the valve when the constant speed compressor is stopped. There is an effect of keeping the pressure difference on the suction / discharge side quickly balanced.

In addition, in the control method of the air conditioner according to the present invention, when the inverter compressor and the constant speed compressor are operated and the constant speed compressor is stopped, the valve is opened to quickly reduce the pressure difference between the discharge side and the suction side of the constant speed compressor, It is effective to shorten the time that the constant speed compressor is restarted.

In addition, since the control method of the air conditioner according to the present invention shortens the time when the constant speed compressor is restarted, it prevents an excessive load applied to the inverter compressor during the time when the constant speed compressor is restarted, thereby There is an effect of improving the reliability.

Claims (6)

An inverter compressor for varying the compression capacity of the refrigerant; At least one constant speed compressor for compressing a refrigerant of a predetermined capacity; A bypass pipe connecting the discharge side and the suction side of the constant speed compressor; The air conditioner is installed on the bypass pipe and comprises a valve for opening and closing the bypass pipe. An inverter compressor for varying the compression capacity of the refrigerant; A plurality of constant speed compressors for compressing a predetermined amount of refrigerant; Respective bypass pipes connecting the discharge side and the suction side of each of the constant speed compressors; It is provided in each bypass pipe, and comprises a valve for opening and closing the bypass pipe by a control unit, The control unit controls the air conditioner, characterized in that for opening the respective valves when the inverter compressor is in operation. The method according to claim 2, When the inverter compressor is in operation and at least one of the constant speed compressors is started, The control unit controls the air conditioner, characterized in that for closing the valve installed in the constant speed compressor is started. The method according to claim 3, When only one of the inverter compressor and the constant speed compressor is in operation and the other constant speed compressor is stopped, The control unit is a control method of the air conditioner, characterized in that for maintaining the valve installed in the constant speed compressor in operation in a closed state, and switching the valve installed in the stationary constant speed compressor to the open state. An inverter compressor for varying the compression capacity of the refrigerant; A constant speed compressor for compressing a refrigerant having a predetermined capacity; A bypass pipe connecting the discharge side and the suction side of the constant speed compressor; It is provided in the bypass pipe, and comprises a valve for opening and closing the bypass pipe by a control unit, The control unit controls the air conditioner, characterized in that for opening the valve when the inverter compressor is in operation. The method according to claim 5, And the control unit closes the valve when the inverter compressor is in operation and the constant speed compressor is started.

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