JP2012242081A - Air conditioner - Google Patents

Air conditioner Download PDF

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Publication number
JP2012242081A
JP2012242081A JP2012114794A JP2012114794A JP2012242081A JP 2012242081 A JP2012242081 A JP 2012242081A JP 2012114794 A JP2012114794 A JP 2012114794A JP 2012114794 A JP2012114794 A JP 2012114794A JP 2012242081 A JP2012242081 A JP 2012242081A
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Japan
Prior art keywords
oil
plurality
air conditioner
compressor
refrigerant
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Granted
Application number
JP2012114794A
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Japanese (ja)
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JP5596745B2 (en
Inventor
Pilhyun Yoon
ヒルヒュン ユーン
Yong Cheol Sa
ヨンチョル サ
Original Assignee
Lg Electronics Inc
エルジー エレクトロニクス インコーポレイティド
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Priority to KR10-2011-0047170 priority Critical
Priority to KR1020110047170A priority patent/KR20120129111A/en
Application filed by Lg Electronics Inc, エルジー エレクトロニクス インコーポレイティド filed Critical Lg Electronics Inc
Publication of JP2012242081A publication Critical patent/JP2012242081A/en
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Publication of JP5596745B2 publication Critical patent/JP5596745B2/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B43/00Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/02Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B31/00Compressor arrangements
    • F25B31/002Compressor arrangements lubrication
    • F25B31/004Compressor arrangements lubrication oil recirculating arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2400/00General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/07Details of compressors or related parts
    • F25B2400/075Details of compressors or related parts with parallel compressors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2400/00General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13Economisers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2515Flow valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/03Oil level

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner in which a plurality of compressors retains a constant oil level.SOLUTION: The air conditioner includes the plurality of compressors which compress refrigerants; a plurality of oil separators which are connected to the plurality of compressors respectively, and separate oil contained in the refrigerants compressed in and discharged from the compressors; a plurality of oil return pipes allowing the oil separated in the plurality of oil separators to be returned to the plurality of compressors; a plurality of oil return valves which are installed in the plurality of oil return pipes respectively, and open and close the plurality of coil return pipes respectively; and a resistor connecting the plurality of oil return pipes to each other.

Description

  The present invention relates to an air conditioner, and more particularly to an air conditioner in which oil levels of a plurality of compressors are maintained constant.

  In general, an air conditioner is a device that cools and / or heats an indoor space by exchanging heat with indoor air through a series of refrigerant cycles in which the refrigerant is compressed, condensed, expanded, and evaporated. Such an air conditioner includes a cooling air conditioner that operates the refrigerant cycle only in one direction and supplies cool air into the room, and an air conditioner that selectively operates the refrigerant cycle in both directions and supplies cool air or hot air to the room. It is classified as a combined use air conditioner.

  Such an air conditioner is classified into a normal air conditioner in which one indoor unit is connected to one outdoor unit and a multi-type air conditioner in which a plurality of indoor units are connected to at least one outdoor unit. Is done.

  Normally, a multi-type air conditioner is used as an application to selectively air-condition a plurality of spaces partitioned in a building, and selectively operates as many compressors as necessary depending on the overall air-conditioning load. Or the compression capacity can be adjusted when the compressor is an inverter type compressor.

  When a plurality of inverter-type compressors are operated together, a difference occurs in the oil level of each compressor due to the variation in the oil discharge rate between the compressors generated depending on the operation state of each compressor. If the oil is insufficient, there is a risk that the compressor will fail due to poor oil supply. On the other hand, when there is too much oil, the required power of the internal motor of a compressor may increase and efficiency may fall. Therefore, it is important to keep the oil levels of the plurality of compressors constant.

  The problem to be solved by the present invention is to provide an air conditioner in which the oil levels of a plurality of compressors are kept constant.

  Another object of the present invention is to provide an air conditioner that controls oil recovered in each compressor according to oil levels of a plurality of compressors.

  The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems that are not mentioned are clearly apparent to those having ordinary knowledge in the technical field to which the present invention belongs from the following description. Should be understood.

In order to solve the above-described problem, an air conditioner according to an embodiment of the present invention includes a plurality of compressors that compress refrigerant, and a refrigerant that is connected to the plurality of compressors and compressed and discharged by the compressor. Installed in each of a plurality of oil separators for separating the oil contained in the oil, a plurality of oil recovery pipes for recovering oil separated by the plurality of oil separators to a plurality of compressors, and a plurality of oil recovery pipes. And a plurality of oil recovery valves that respectively open and close the plurality of oil recovery pipes, and a resistor that connects the plurality of oil recovery pipes to each other.
Specific matters of other embodiments are included in the detailed description and the drawings.

It is a block diagram of the air conditioner which concerns on one Embodiment of this invention. It is a partial detailed block diagram of the air conditioner which concerns on one Embodiment of this invention. It is a partial detailed block diagram of the air conditioner which concerns on other embodiment of this invention.

  Advantages and features of the present invention, and methods for achieving them, will become apparent with reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and can be embodied in various different forms. However, this embodiment is provided in order to make the disclosure of the present invention complete, and to fully inform the scope of the invention to those who have ordinary knowledge in the technical field to which the present invention belongs. Is defined solely by the claims. Portions denoted by the same reference numerals throughout the specification indicate the same components.

  Hereinafter, the present invention will be described in detail with reference to the drawings for describing an air conditioner according to an embodiment of the present invention.

FIG. 1 is a configuration diagram of an air conditioner according to an embodiment of the present invention.
The outdoor unit OU includes a compressor 110, an outdoor heat exchanger 140, an outdoor expansion valve 132, and a supercooler 180. The air conditioner can include one or more outdoor units OU. In the present embodiment, one outdoor unit OU is included.

  The compressor 110 compresses the flowing low-temperature and low-pressure refrigerant into a high-temperature and high-pressure refrigerant. Various structures can be adopted as the compressor 110, and an inverter type compressor or a constant speed compressor may be adopted. In the present embodiment, the outdoor unit OU includes a plurality of compressors 110, and includes a plurality of inverter type compressors whose compression capacities change depending on the operation state. In this embodiment, two inverter type compressors are provided as the compressor 110.

  In order to prevent the liquid refrigerant from flowing into the compressor 110, an accumulator 187 can be installed in the suction pipe 162 of the compressor 110.

  Each of the plurality of compressors 110 is connected to a plurality of refrigerant discharge pipes 172 from which compressed refrigerant is discharged. The plurality of refrigerant discharge pipes 172 are connected to a plurality of oil separators 171 for separating oil contained in the discharged refrigerant. The refrigerant that has passed through the plurality of oil separators 171 is guided to the four-way valve 160 via the plurality of discharge pipes 161. The detailed structure and description of the plurality of compressors 110 and the plurality of oil separators 171 will be described later with reference to FIG.

  The four-way valve 160 is a flow path switching valve for switching between cooling and heating. The four-way valve 160 guides the refrigerant compressed by the compressor 110 to the outdoor heat exchanger 140 via the inflow pipe 168 during the cooling operation, and guides the refrigerant to the indoor heat exchanger 120 via the engine 169 during the heating operation. The four-way valve 160 is in the B state during the cooling operation and is in the A state during the heating operation.

  The engine 169 guides the refrigerant evaporated from the indoor heat exchanger 120 during the cooling operation to the four-way valve 160 so as to flow to the compressor 110. The engine 169 guides the refrigerant compressed by the compressor 110 during the heating operation to flow to the indoor heat exchanger 120 through the four-way valve 160.

  The outdoor heat exchanger 140 is disposed in an outdoor space, and the refrigerant passing through the outdoor heat exchanger 140 exchanges heat with outdoor air. The outdoor heat exchanger 140 acts as a condenser during the cooling operation, and acts as an evaporator during the heating operation. The outdoor heat exchanger 140 is connected to the liquid pipe 165 by an outflow pipe 166.

  The outdoor expansion valve 132 contracts the refrigerant that flows in during the heating operation, and is installed on the outflow pipe 166. Further, a first bypass pipe 167 for allowing the refrigerant to bypass the outdoor expansion valve 132 is installed on the outflow pipe 166, and a check valve 133 is installed on the first bypass pipe 167.

  The check valve 133 allows the refrigerant to flow from the outdoor heat exchanger 140 to the plurality of indoor units IU during the cooling operation, but blocks the refrigerant flow during the heating operation.

  The supercooler 180 includes a supercooling heat exchanger 184, a second bypass pipe 181, a supercooling expansion valve 182, and a discharge pipe 185. The supercooling heat exchanger 184 is disposed on the outflow pipe 166. During the cooling operation, the second bypass pipe 181 functions to bypass the refrigerant discharged from the supercooling heat exchanger 184 and to flow into the supercooling expansion valve 182.

  The supercooling expansion valve 182 is disposed on the second bypass pipe 181, contracts the liquid refrigerant flowing into the second bypass pipe 181, lowers the pressure and temperature of the refrigerant, and then performs a supercooling heat exchanger. 184. Various types of undercooling expansion valves 182 can be used, and linear expansion valves can be used for convenience of use.

  During the cooling operation, the condensed refrigerant that has passed through the outdoor heat exchanger 140 is supercooled by heat exchange with the low-temperature refrigerant that has flowed through the second bypass pipe 181 and the supercooling heat exchanger 184, and then the liquid pipe 165 is To the plurality of indoor units IU.

  The refrigerant that has passed through the second bypass pipe 181 is heat-exchanged by the supercooling heat exchanger 184 and then flows into the accumulator 187 via the discharge pipe 185.

  Each of the plurality of indoor units IU in the air conditioner according to the embodiment of the present invention includes an indoor heat exchanger 120, an indoor blower (not shown), and an indoor expansion valve 131. The air conditioner can include one or a plurality of indoor units IU. In the present embodiment, the air conditioner includes a first indoor unit IU (1) to a third indoor unit IU (3).

  The indoor heat exchanger 120 is disposed in the indoor space, and the refrigerant passing through the indoor heat exchanger 120 exchanges heat with indoor air. The indoor heat exchanger 120 acts as an evaporator during cooling operation and acts as a condenser during heating operation. The indoor heat exchanger 120 is connected to the engine 169 by an indoor outlet pipe 164 and is connected to a liquid pipe 165 by an indoor inlet pipe 163.

  The indoor blower (not shown) blows indoor air that is heat-exchanged by the indoor heat exchanger 120.

  The indoor inlet pipe 163 is provided with an indoor expansion valve 131. The indoor expansion valve 131 is a device that contracts the refrigerant flowing in during the cooling operation. The indoor expansion valve 131 is installed in the indoor inlet pipe 163 of the indoor unit IU. Various types of indoor expansion valves 131 can be used, and linear expansion valves can be used for convenience of use.

FIG. 2 is a partial detailed configuration diagram of an air conditioner according to an embodiment of the present invention.
An air conditioner according to an embodiment of the present invention is included in a plurality of compressors 110 that compress a refrigerant, and a refrigerant that is connected to each of the plurality of compressors 110 and compressed and discharged by the compressor 110. A plurality of oil separators 171 for separating oil, a plurality of oil recovery pipes 177 for recovering oil separated by the plurality of oil separators 171 to a plurality of compressors 110, and a plurality of oil recovery pipes 177, respectively. And a plurality of oil recovery valves 176 that respectively open and close the plurality of oil recovery pipes 177, and a resistor 175 that connects the plurality of oil recovery pipes 177 to each other.

  As described above, the plurality of compressors 110 compress the low-temperature and low-pressure refrigerant flowing into the high-temperature and high-pressure refrigerant. In the present embodiment, as the plurality of compressors 110, a first compressor 110 (1) and a second compressor 110 (2) are provided. Both the first compressor 110 (1) and the second compressor 110 (2) are preferably inverter type compressors whose compression capacity varies depending on the operating state.

  The compressor 110 includes a refrigerant inflow port 111 through which refrigerant flows, a refrigerant discharge port 112 through which compressed refrigerant is discharged, an oil level sensor 113 that detects the height of oil inside, and an oil into the inside. An oil pump 114.

  The refrigerant inflow port 111 is a port into which the refrigerant flows, and is connected to the suction pipe 162. The refrigerant flowing into the suction pipe 162 flows through the refrigerant inflow port 111 through the accumulator 187. The first compressor 110 (1) includes a first refrigerant inflow port 111 (1), and the second compressor 110 (2) includes a second refrigerant inflow port 111 (2).

  The refrigerant discharge port 112 discharges the refrigerant compressed by the compressor. The refrigerant discharge port 112 is connected to the refrigerant discharge pipe 172. At the refrigerant discharge port 112, the oil inside the compressor 110 is discharged together with the compressed refrigerant. The refrigerant containing the oil discharged from the refrigerant discharge port 112 flows to the oil separator 171 through the refrigerant discharge pipe 172. The first compressor 110 (1) includes a first refrigerant discharge port 112 (1), and the second compressor 110 (2) includes a second refrigerant discharge port 112 (2).

  The oil level sensor 113 detects whether or not the height of the oil level inside the compressor 110 (hereinafter simply referred to as “oil height”) is equal to or higher than the height of the oil level sensor 113. Oil is contained within the compressor 110, which lubricates and cools the mechanical device for compressing the refrigerant. The oil fills the bottom surface of the compressor 110 and is pumped when the compressor 110 is driven. The oil level sensor 113 detects the height of oil that fills the bottom surface of the compressor 110. Whether the oil recovery valve 176 is opened or closed is determined according to the oil level detected by the oil level sensor 113. The first compressor 110 (1) includes a first oil level sensor 113 (1), and the second compressor 110 (2) includes a second oil level sensor 113 (2).

  The oil pump 114 is connected to the oil recovery pipe 177 and allows oil to flow into the compressor 110. The oil pump 114 is provided inside the compressor 110 and fills the bottom surface of the compressor 110 with oil. The oil pump 114 is preferably provided below the oil level sensor 113 in the compressor 110. The first compressor 110 (1) includes a first oil pump 114 (1), and the second compressor 110 (2) includes a second oil pump 114 (2).

  The oil pump 114 is preferably a trochoid pump that pumps oil. The oil pump 114 is preferably provided in the case of a high-pressure compressor, and may be omitted in the case of a low-pressure compressor. When the compressor 110 is a low-pressure compressor, the oil recovery pipe 177 is preferably connected directly to the compressor 110.

  The oil pump 114 may be a pump that is provided inside the compressor 110 and pumps oil on the bottom surface of the compressor upward, instead of a pump provided separately. Such a pump is preferably a trochoid pump that pumps oil to the top, and the oil inside the compressor 110 is pumped to the top so that the oil in the oil recovery pipe 177 is sucked into the compressor 110. In this case, the oil recovery pipe 177 is not directly connected to the oil pump 114.

  The oil separator 171 separates oil contained in the refrigerant discharged from the compressor 110. A plurality of oil separators 171 are provided corresponding to the plurality of compressors 110. As a plurality of oil separators 171, a first oil separator 171 (1) corresponding to the first compressor 110 (1) and a second oil separator 171 (2) corresponding to the second compressor 110 (2). And.

  The oil separator 171 and the compressor 110 are connected to the refrigerant discharge pipe 172. A plurality of refrigerant discharge pipes 172 of the compressor 110 are provided, and the plurality of refrigerant discharge pipes 172 are respectively connected to the refrigerant discharge ports 112 of the plurality of compressors 110. As a plurality of refrigerant discharge pipes 172, a first refrigerant discharge pipe 172 (1) connecting the first compressor 110 (1) and the first oil separator 171 (1), and a second compressor 110 (2) A second refrigerant discharge pipe 172 (2) connecting the second oil separator 171 (2).

  The refrigerant from which the oil has been separated by the oil separator 171 is discharged to the discharge pipe 161. A plurality of discharge pipes 161 are provided, and the plurality of discharge pipes 161 are respectively connected to a plurality of oil separators 171. As a plurality of discharge pipes 161, a first discharge pipe 161 (1) connected to the first oil separator 171 (1) and a second discharge pipe 161 (2) connected to the second oil separator 171 (2). It is equipped with.

  The oil separated by the oil separator 171 is discharged to the oil discharge pipe 173. The oil discharge pipe 173 is branched into an oil recovery pipe 177 and an oil merge pipe 174. The oil discharge pipe 173 is preferably provided with a check valve that prevents backflow of oil.

  A plurality of oil discharge pipes 173 are provided, and the plurality of oil discharge pipes 173 are respectively connected to the plurality of oil separators 171 so that the oil separated by the plurality of oil separators 171 is discharged. As a plurality of oil discharge pipes 173, a first oil discharge pipe 173 (1) connected to the first oil separator 171 (1) and a second oil discharge pipe 173 (connected to the second oil separator 171 (2) 2).

  The oil recovery pipe 177 is a pipe through which the oil separated by the oil separator 171 flows and is recovered by the compressor 110. The oil recovery pipe 177 connects the oil discharge pipe 173 and the compressor 110. The oil recovery pipe 177 is connected to the compressor 110 and can be directly connected to the oil pump 114.

  A plurality of oil recovery pipes 177 are provided, and the plurality of oil recovery pipes 177 are connected to the plurality of oil discharge pipes 173, respectively. As a plurality of oil recovery pipes 177, a first oil recovery pipe 177 (1) connecting the first oil discharge pipe 173 (1) and the first compressor 110 (1), and a second oil discharge pipe 173 (2). And a second oil recovery pipe 177 (2) connecting the second compressor 110 (2).

  The oil recovery valve 176 is installed in the oil recovery pipe 177 to open and close the oil recovery pipe 177. The oil recovery valve 176 allows or blocks the oil separated by the oil separator 171 from being recovered by the compressor 110. Oil recovery valve 176 is controlled by oil level sensor 113. When the oil level in the compressor 110 connected to the oil recovery pipe 177 provided with the oil recovery valve 176 is less than the height of the oil level sensor 113, the oil level sensor 113 is opened. Closed.

  A plurality of oil recovery valves 176 are provided. As a plurality of oil recovery valves 176, a first oil recovery valve 176 (1) installed in the first oil recovery pipe 177 (1) and a second oil recovery pipe 177 (2 And a second oil recovery valve 176 (2).

  The first oil recovery valve 176 (1) is opened when the height of the oil inside the first compressor 110 (1) is less than the height of the first oil level sensor 113 (1). When it is higher than the level sensor 113 (1), it is closed. Similarly, the second oil recovery valve 176 (2) is opened when the oil level inside the second compressor 110 (2) is less than the height of the second oil level sensor 113 (2), When it is equal to or higher than the height of the second oil level sensor 113 (2), it is closed.

  The resistor 175 connects the plurality of oil recovery pipes 177 to each other. The resistor 175 connects the first oil recovery pipe 177 (1) and the second oil recovery pipe 177 (2) to each other. The resistor 175 is connected to the oil recovery pipe 177 by an oil junction pipe 174.

  A plurality of oil merging pipes 174 are provided, and the plurality of oil merging pipes 174 are connected to the plurality of oil discharge pipes 173 and connected to the resistor 175, respectively. As a plurality of oil merging pipes 174, a first oil merging pipe 174 (1) that connects the first oil collecting pipe 177 (1) and the resistor 175, a second oil collecting pipe 177 (2), and the resistor 175, And a second oil merging pipe 174 (2).

  The first oil merging pipe 174 (1) allows the oil separated by the first oil separator 171 (1) to flow toward the second oil recovery pipe 177 (2), and the second oil merging pipe 174 (2). Causes the oil separated by the second oil separator 171 (2) to flow toward the first oil recovery pipe 177 (1).

  The resistor 175 is preferably formed using a capillary so that the oil recovered from each of the plurality of oil recovery pipes 177 does not merge when all of the plurality of oil recovery valves 176 are opened. The resistor 175 is opened when only one of the plurality of oil recovery valves 176 is opened, and the other one is opened when oil discharged to the plurality of oil discharge pipes 173 joins when closed. The oil recovery valve 176 thus made flows to the oil recovery pipe 177 provided.

  The operation of the air conditioner according to the present invention configured as described above will be described as follows.

  The refrigerant compressed by the plurality of compressors 110 is discharged together with oil through each refrigerant discharge port 112. The refrigerant and oil discharged to the refrigerant discharge ports 112 of the plurality of compressors 110 flow into the plurality of oil separators 171 through the plurality of refrigerant discharge pipes 172, respectively.

  The plurality of oil separators 171 separates refrigerant and oil. The refrigerant from which the oil has been separated by the plurality of oil separators 171 is discharged to the plurality of discharge pipes 161, respectively. The oil separated by the plurality of oil separators 171 is discharged to the plurality of oil discharge pipes 173, respectively.

  The oil discharged to the plurality of oil discharge pipes 173 flows differently depending on the oil level inside the compressor 110 detected by the oil level sensor 113.

  The height of the oil inside the first compressor 110 (1) is less than the height of the first oil level sensor 113 (1), and the height of the oil inside the second compressor 110 (2) is the second oil. When the level sensor 113 (2) is higher than the height, the first oil recovery valve 176 (1) is opened and the second oil recovery valve 176 (2) is closed. In this case, all of the oil separated by the plurality of oil separators 171 is recovered by the first compressor 110 (1). That is, the oil separated by the first oil separator 171 (1) is first fed by the first oil pump 114 (1) through the first oil discharge pipe 173 (1) and the first oil recovery pipe 177 (1). It is recovered by the compressor 110 (1). The oil separated by the second oil separator 171 (2) is separated from the second oil discharge pipe 173 (2), the second oil merging pipe 174 (2), the resistor 175, and the first oil merging pipe 174 (1). ) And the first oil recovery pipe 177 (1) and is recovered by the first oil pump 114 (1) to the first compressor 110 (1).

  The height of the oil inside the first compressor 110 (1) is equal to or higher than the height of the first oil level sensor 113 (1), and the height of the oil inside the second compressor 110 (2) is the second oil. When the level sensor 113 (2) is less than the height, the first oil recovery valve 176 (1) is closed and the second oil recovery valve 176 (2) is opened. In this case, all the oil separated by the plurality of oil separators 171 is recovered by the second compressor 110 (2). That is, the oil separated by the second oil separator 171 (2) is secondly passed by the second oil pump 114 (2) through the second oil discharge pipe 173 (2) and the second oil recovery pipe 177 (2). It is recovered by the compressor 110 (2). The oil separated by the first oil separator 171 (1) is separated from the first oil discharge pipe 173 (1), the first oil merging pipe 174 (1), the resistor 175, and the second oil merging pipe 174 (2). ) And the second oil recovery pipe 177 (2), and is recovered by the second compressor 110 (2) by the second oil pump 114 (2).

  The height of the oil inside the first compressor 110 (1) is less than the height of the first oil level sensor 113 (1), and the height of the oil inside the second compressor 110 (2) is the second oil. When the level sensor 113 (2) is less than the height, the first oil recovery valve 176 (1) is opened and the second oil recovery valve 176 (2) is also opened. In this case, the resistor 175 prevents the oil recovered in each of the plurality of oil recovery pipes 177 from joining, so that the oil separated by the plurality of oil separators 171 is supplied to the corresponding compressors 110. Collected.

  The oil separated by the first oil separator 171 (1) can move to the first oil junction pipe 174 (1) through the first oil discharge pipe 173 (1), but the flow is limited by the resistor 175. Therefore, the first oil recovery valve 176 (1) is recovered to the first compressor 110 (1) by the first oil pump 114 (1) through the first oil recovery pipe 177 (1) opened. The oil separated by the second oil separator 171 (2) can move to the second oil junction pipe 174 (2) via the second oil discharge pipe 173 (2), but the flow is limited by the resistor 175. Accordingly, the second oil recovery valve 176 (2) is recovered to the second compressor 110 (2) by the second oil pump 114 (2) through the second oil recovery pipe 177 (2) opened.

FIG. 3 is a partial detailed configuration diagram of an air conditioner according to another embodiment of the present invention.
The plurality of oil recovery pipes 277 of the air conditioner according to another embodiment of the present invention are respectively connected to the refrigerant inflow ports 111 of the plurality of compressors 110. As the plurality of oil recovery pipes 277, the first oil recovery pipe 277 (1) connected to the first refrigerant inflow port 111 (1) of the first compressor 110 (1) and the second oil recovery pipe 277 (1) are connected. And a second oil recovery pipe 277 (2) connected to the two refrigerant inflow ports 111 (2).

  The refrigerant inflow port 111 is connected to the suction pipe 162 and the oil recovery pipe 277, passes through the accumulator 187, flows into the suction pipe 162, and is separated by the oil separator 171 and flows into the oil recovery pipe 277. Flows in.

  The compressor 110 in this case is a low-pressure compressor and does not require the oil pump 114 separately.

  In other embodiments, the plurality of oil recovery tubes 277 may be coupled to the accumulator 187.

  While the embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the present invention is not deviated from the gist of the present invention claimed in the scope of claims. It goes without saying that various modifications can be implemented by those having ordinary knowledge in the technical field to which the invention belongs, and such modifications can be individually understood from the technical idea and perspective of the present invention. must not.

Claims (15)

  1. A plurality of compressors for compressing the refrigerant;
    A plurality of oil separators, each connected to the plurality of compressors, for separating oil contained in the refrigerant compressed and discharged by the compressor;
    A plurality of oil recovery pipes in which the oil separated by the plurality of oil separators is recovered by the plurality of compressors;
    A plurality of oil recovery valves that are respectively installed in the plurality of oil recovery pipes and open and close each of the plurality of oil recovery pipes;
    A resistor connecting the plurality of oil recovery pipes to each other;
    An air conditioner comprising:
  2.   The air conditioner according to claim 1, wherein the compressor includes an oil level sensor that detects a height of an oil level inside.
  3.   The air conditioner according to claim 2, wherein the oil recovery valve is opened when a height of an oil level inside the connected compressor is less than a height of the oil level sensor.
  4.   The air conditioner according to claim 2, wherein the oil recovery valve is closed when a height of an oil level inside the connected compressor is equal to or higher than a height of the oil level sensor.
  5.   The air conditioner according to claim 1, further comprising a plurality of oil discharge pipes connected to the plurality of oil separators, respectively, through which oil separated by the plurality of oil separators is discharged.
  6.   The air conditioner according to claim 5, wherein the plurality of oil recovery pipes are respectively connected to the plurality of oil discharge pipes.
  7.   The air conditioner according to claim 5, further comprising a plurality of oil junction pipes connected to the plurality of oil discharge pipes and connected to the resistor.
  8.   The air conditioner according to claim 1, wherein the compressor includes an oil pump that is connected to the oil recovery pipe and causes oil to flow into the compressor.
  9.   The air conditioner according to claim 8, wherein the oil pump is provided inside the compressor.
  10. The compressor includes a refrigerant inflow port through which a refrigerant flows,
    The air conditioner according to claim 1, wherein the oil recovery pipe is connected to the refrigerant inflow port.
  11. The compressor includes a refrigerant discharge port through which compressed refrigerant is discharged,
    The air conditioner according to claim 1, further comprising a plurality of refrigerant discharge pipes respectively connected to the refrigerant discharge ports of the plurality of compressors.
  12.   The air conditioner according to claim 1, wherein the resistor is a capillary.
  13.   2. The air conditioner according to claim 1, wherein when the plurality of oil recovery valves are all opened, the resistor prevents the oil recovered in each of the plurality of oil recovery pipes from joining. 3.
  14.   In the resistor, when a part of the plurality of oil recovery valves is opened and the rest is closed, the oil separated by the oil separator connected to the closed oil recovery valve is removed. The air conditioner according to claim 1, wherein the air conditioner flows through the oil recovery pipe connected to the opened oil recovery valve.
  15.   2. The air conditioner according to claim 1, further comprising a plurality of discharge pipes connected to the plurality of oil separators, each of which discharges refrigerant from which oil has been separated by the plurality of oil separators.
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CN102788449A (en) 2012-11-21
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US20120291464A1 (en) 2012-11-22
JP5596745B2 (en) 2014-09-24
KR20120129111A (en) 2012-11-28
CN102788449B (en) 2016-01-27

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