JP5306766B2 - Air conditioner - Google Patents

Abstract

The utility model discloses an air conditioner. A cooling circulation is formed in the air conditioner, a gas-liquid separator is communicated with a compressor by using a bypass loop comprising a bypass open and close valve and capillaries, and the gas-liquid separator is adjoined with a connecting pipeline group PG formed by a connecting pipeline PA, a connecting pipeline PB, a connecting pipeline PC, a connecting pipeline PD and a connecting pipeline PE, and is arranged in an upper portion space separated from a machine chamber bottom board of an outdoor unit. The connecting pipeline PA connects an outlet component of an outdoor heat exchanger with an inlet component b of an electric expansion valve. The connecting pipeline PB connects an outlet component c of the electric expansion valve with an inlet component d of the gas-liquid separator. The connecting pipeline PC connects a lateral outlet component e of the gas-liquid separator with a liner valve 7b. The connecting pipeline PD connects a lateral outlet component f of the gas-liquid separator with an inlet component g of the bypass open and close valve of the bypass loop. The connecting pipeline PE connects an outlet component h of the bypass open and close valve with a refrigerant pipeline P of the i side of a suction component of the compressor.

Description

  The present invention relates to an air conditioner including an outdoor unit with an improved support structure for a gas-liquid separator.

  [Patent Document 1] discloses a refrigeration unit equipped with a first gas-liquid separator that separates refrigerant sucked from a compressor and a second gas-liquid separator that gas-liquid separates an intermediate pressure refrigerant. . The first gas-liquid separator is disposed on the side of the compressor and adjacent to the compressor, and the second gas-liquid separator is disposed in a gap formed between the compressor and the first gas-liquid separator. It is characterized by that.

Specifically, the outlet pipe extends upward from the upper end of the first gas-liquid separator and is connected to the low-pressure refrigerant suction port at the lower part of the compressor, and the first gas-liquid separator is supported by the compressor by the outlet pipe. The outlet pipe constituting the injection passage of the second gas-liquid separator also extends upward from this upper end and is connected to the injection port of the compressor, and the second gas-liquid separator is also supported by the compressor by the outlet pipe.
JP-A-10-160201

  However, when each gas-liquid separator is supported by a compressor via a pipe as in [Patent Document 1], vibration due to the operation of the compressor is directly applied to each gas-liquid separator, and the gas-liquid separator vibrates. This adversely affects the storage of the separated liquid refrigerant. Therefore, the height of the gas-liquid separator is made equal to that of the compressor, and the liquid refrigerant and the gas refrigerant are completely separated vertically in the gas-liquid separator.

  In such a configuration, a gas-liquid separator, which is a relatively large container, exists on the side of the compressor. Therefore, it is necessary to increase the arrangement space of the machine room that accommodates the compressor and the gas-liquid separator, and an additional connection space with other piping is required, which increases the size of the entire outdoor unit.

  Also, a special fixing bracket is prepared so that the vibration of the compressor is not transmitted to the gas-liquid separator, and the gas-liquid separator is mounted and fixed on the bottom plate of the machine room via the fixing bracket. . In this case, a space for mounting the fixing bracket on the machine room bottom plate and a work space necessary for the mounting work must be secured, and an increase in the size of the outdoor unit is inevitable.

  The present invention has been made based on the above circumstances, and its object is to install a gas-liquid separator without being affected by vibrations caused by the operation of the compressor and without requiring a dedicated fixture. Therefore, it is an object of the present invention to provide an air conditioner that can improve the reliability of the gas-liquid separator and suppress the enlargement of the outdoor unit.

In order to satisfy the above-described object, the present invention sequentially includes a compressor accommodated in an outdoor unit, an outdoor heat exchanger, an electric expansion valve (PMV), and an indoor heat exchanger accommodated in the indoor unit via refrigerant piping. The gas-liquid separator provided in the refrigerant pipe connecting the electric expansion valve and the indoor heat exchanger to the outdoor unit is accommodated in the refrigeration cycle and connected to the outdoor unit, and the gas and liquid separated by this gas-liquid separator Refrigerant is returned to the compressor through the bypass circuit, and in the air conditioner equipped with the bypass opening and closing valve and the capillary tube in the bypass circuit,
Connection pipe PA for connecting the outdoor heat exchanger outlet and the electric expansion valve inlet, connection pipe PB for connecting the electric expansion valve outlet and the gas-liquid separator inlet, and the liquid-side outlet of the gas-liquid separator Connecting pipe PC that connects the part and the packed valve connected to the indoor unit, connecting pipe PD that connects the gas side outlet of the gas-liquid separator and the bypass opening and closing valve inlet in the bypass circuit, and bypass in the bypass circuit A connecting pipe PE that connects the on-off valve outlet part and the refrigerant pipe on the compressor suction part side via a capillary tube, and the gas-liquid separator is an upper space separated from the machine room bottom plate of the outdoor unit housing the compressor Are arranged adjacent to the connection piping group consisting of the connection piping PA to PE.
And the temperature sensor which detects the refrigerant | coolant temperature for controlling the opening degree of an electric expansion valve was attached to the upstream of the connection site | part of the connection piping PE in the refrigerant | coolant piping by the side of a compressor suction part.

  According to the present invention, an improvement in the reliability of the gas-liquid separator can be obtained, and the effect of suppressing the increase in the size of the outdoor unit can be achieved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of a refrigeration cycle of an air conditioner.
The air conditioner includes an outdoor unit 1A and an indoor unit 1B. The outdoor unit 1A contains a compressor 2, a four-way switching valve 3, an outdoor heat exchanger 4, and an electric expansion valve (PMV) 5, and the indoor unit 1B contains an indoor heat exchanger 6. Although not shown, an outdoor fan is disposed facing the outdoor heat exchanger 4, and an indoor fan is disposed facing the indoor heat exchanger 6.

  The compressor 2, the four-way switching valve 3, the outdoor heat exchanger 4, the electric expansion valve 5, and the indoor heat exchanger 6 are sequentially connected via the refrigerant pipe P, and these constitute a heat pump refrigeration cycle. The The two refrigerant pipes P connected to the indoor heat exchanger 6 of the indoor unit 1B are connected to packed valves 7a and 7b provided in the outdoor unit 1A.

  One packed valve 7 a is connected to a refrigerant pipe P extending from the four-way switching valve 3. The other packed valve 7 b is connected to a refrigerant pipe P extending from the electric expansion valve 5. A gas / liquid separator 8 described later is provided in the refrigerant pipe P connecting the packed valve 7b and the electric expansion valve 5, and the gas / liquid separator 8 is accommodated in the outdoor unit 1A.

  A bypass circuit 10 is connected to the gas-liquid separator 8. The bypass circuit 10 is provided with a bypass on-off valve 11 that is an electromagnetic two-way valve and a capillary tube 12. The bypass circuit 10 is connected to a refrigerant pipe P on the suction side of the compressor 2 as will be described later.

  For convenience of explanation, the refrigerant pipe that connects the outlet part a of the outdoor heat exchanger 4 and the inlet part b of the electric expansion valve 5 on the basis of the refrigeration cycle during the cooling operation is referred to as “connection pipe PA”. The refrigerant pipe that connects the outlet part c of the electric expansion valve 5 and the inlet part d of the gas-liquid separator 8 is referred to as “connection pipe PB”.

  A refrigerant pipe connecting the liquid side outlet e of the gas-liquid separator 8 and one packed valve 7b connected to the indoor unit 1B is referred to as a “connection pipe PC”. A refrigerant pipe connecting the gas side outlet f of the gas-liquid separator 8 and the inlet g of the bypass on-off valve 11 in the bypass circuit 10 is referred to as “connection pipe PD”.

  A refrigerant pipe connecting the outlet h of the bypass on-off valve 11 in the bypass circuit 10 and the refrigerant pipe P on the suction part i side of the compressor 2 via the capillary tube 12 is referred to as “connection pipe PE”. The connection pipe group PG composed of these connection pipes PA to PE and the gas-liquid separator 8 are accommodated in the machine room of the outdoor unit 1A as described later.

As the gas-liquid separator 8, a surface tension type gas-liquid separator disclosed in, for example, PCT application WO2007 / 055386A1 as shown in FIG. 2 is used.
The schematic configuration of the gas-liquid separator 8 will be described. A container main body (outer body) 9, an inlet part d capable of introducing a gas-liquid two-phase into the container main body 9, and fluid communication with the inlet part d. A gas-liquid separation chamber that is connected and separates the gas-liquid two phases into a gas phase and a liquid phase is provided inside the container body 9.

  Furthermore, a gas side outlet portion f through which the separated gas phase is guided and connected to the gas-liquid separation chamber so as to be in fluid communication and a liquid side outlet portion e through which the liquid phase is guided are provided. The gas-liquid separation chamber has a narrow space for introducing a gas-liquid two-phase flow from the inlet portion d, and a rapidly expanding portion and a grooved portion communicating with the narrow space. The grooved portion is a grooved body having a grooved surface separate from the container body 9.

And the inlet part d is provided in the upper end part of the container main body 9 which turned the axial direction to perpendicular | vertical, and the connection piping PB connected with the outlet part c of the electric expansion valve 5 is connected here. A liquid-side outlet portion e is provided at the lower peripheral surface of the container body 9, and a connection pipe PC that connects one packed valve 7b connected to the indoor unit 1B is connected thereto.
Further, a gas side outlet portion f is provided at the lower end portion of the container main body 9, and a connection pipe PD that connects the inlet portion g of the bypass on-off valve 11 provided in the bypass circuit 10 is connected.

  As shown in FIG. 1 again, the temperature sensor 13 for detecting the refrigerant temperature for controlling the opening degree of the electric expansion valve 5 connects the suction part i of the compressor 2 and the four-way switching valve 3 to the refrigerant pipe P. Installed on. If it demonstrates, it will be attached to the upstream rather than the connection site | part of the connection piping PE connected to the refrigerant | coolant piping P which connects the suction part i of the compressor 2, and the four-way switching valve 3. FIG.

Next, an actual piping configuration in the outdoor unit 1A will be described.
FIG. 3 is a perspective view showing the internal structure of the outdoor unit 1 </ b> A, in which each surface portion of the casing excluding the bottom plate 15 constituting the casing and the outdoor blower arranged on the bottom plate 15 are omitted. Moreover, the partition plate 16 is shown with the dashed-two dotted line.

  The bottom plate 15 is formed in a rectangular shape in plan view, and has an outdoor heat exchanger 4 that is formed in a substantially L shape in plan view along one side in the longitudinal direction and the short direction. . Along the other side in the longitudinal direction surrounded by the outdoor heat exchanger 4, there is provided a recess 15a for positioning and mounting a gantry that supports the outdoor fan.

  The partition plate 16 is provided from the end of the outdoor heat exchanger 4 that is bent in the longitudinal direction along the side surface of the recess 15a for mounting the outdoor fan. A space space partitioned from the partition plate 16 to the outdoor heat exchanger 4 and the recessed portion 15a side is referred to as a heat exchange chamber Ra, and a space space partitioned to the opposite side of the heat exchange chamber Ra is referred to as a machine room Rb.

  The machine room Rb accommodates the compressor 2, the gas-liquid separator 8, the packed valves 7a and 7b, and a connection pipe group PG described later. The connection piping group PG includes the four-way switching valve 3, the muffler 17, and the electric expansion valve 5, and all the refrigerants that connect the components in the outdoor unit 1A described in the refrigeration cycle configuration of FIG. It consists of piping P.

  The outdoor heat exchanger 4 is provided with end plates t on both sides, and a plurality of fins F are arranged side by side with a predetermined interval between the end plates t. A heat exchange pipe N is provided therethrough. The end portion of the partition plate 16 is attached in a state where it is overlapped with the one end plate t. Therefore, a part of the heat exchange pipe N protrudes from the end plate t and the partition plate 16.

FIG. 4 is an enlarged perspective view showing the main part of the connection pipe group PG.
Here, two heat exchange pipes constituting the outdoor heat exchanger 4 are extended in a horizontal direction from a portion where the end plate t of the outdoor heat exchanger 4 and the end of the partition plate 16 are not shown. Refrigerant pipes P are connected to the respective heat exchange pipes, bent upward at predetermined locations, one of which is bent horizontally and then bent downward and connected to the capillary tube 18.

  A shunt 19 is connected to the capillary tube 18 in the vertical direction. The other refrigerant pipe P is bent in the same manner as the one refrigerant pipe and then directly connected to the flow divider 19. Therefore, the two refrigerant pipes P join at the flow divider 19.

  The refrigerant pipe P extending from the lower end of the flow divider 19 is bent in a substantially U shape, extended upward so as not to come into contact with other refrigerant pipes and components, and electrically driven with the axial direction oriented vertically. Connected to the lower end of the expansion valve 5. That is, the connection pipe PA connects the outlet part a of the outdoor heat exchanger 4 and the inlet part b of the electric expansion valve 5 described above with reference to FIG.

  The refrigerant pipe P extending from the side portion of the electric expansion valve 5 is bent downward and connected to the upper end portion of the muffler 17 whose axial direction is directed vertically. Further, the refrigerant pipe P extending from the lower end of the muffler 17 is bent in a substantially U shape at a predetermined portion and extends upward.

  Then, it is bent in a substantially U-shape in the vicinity of the electric expansion valve 5 and is directed in the vertical direction to be connected to the upper end portion of the gas-liquid separator 8. That is, it is a connecting pipe PB that connects the outlet c of the electric expansion valve 5 described above with reference to FIG. 1 and the inlet d of the gas-liquid separator 8.

As described with reference to FIG. 2, the gas-liquid separator 8 is also oriented in the vertical direction, and the refrigerant pipe P extending from the side portion is once oriented in the horizontal direction and bent downward at a predetermined portion. . Furthermore, it is bent in the horizontal direction at a predetermined site, and is connected to the packed valve 7b via a bent portion in the middle.
That is, it is a connection pipe PC that connects the liquid side outlet e of the gas-liquid separator 8 described above with reference to FIG. 1 and the packed valve 7b connected to the indoor unit 1B.

  The refrigerant pipe P extending from the lower end of the gas-liquid separator 8 is bent into a substantially U shape at a predetermined portion and extends upward. The refrigerant pipe P is bent obliquely so as not to come into contact with other refrigerant pipes and components, and is bent in the horizontal direction at an upper portion of the gas-liquid separator 8.

  A bypass opening / closing valve 11 is directed vertically above the gas-liquid separator 8, and the refrigerant pipe P is connected to this side portion. That is, the connection pipe PD connects the gas side outlet f of the gas-liquid separator 8 described above with reference to FIG. 1 and the inlet g of the bypass on-off valve 11 in the bypass circuit 10.

  A refrigerant pipe P extending from the lower end of the bypass on-off valve 11 extends downward and is connected to one end of a capillary tube 12 provided on the side of the gas-liquid separator 8. The capillary tube 12 is bent in a circular coil shape, and the other end is directed upward.

The refrigerant pipe P connected to the other end of the capillary tube 12 is once bent in the horizontal direction, then bent upward, and further bent downward. Here, the suction pipe i of the compressor 2 (not shown) It connects with the middle part of the refrigerant | coolant piping P which connects.
That is, the connection pipe PE connects the outlet h of the bypass on-off valve 11 in the bypass circuit 10 described above with reference to FIG. 1 and the refrigerant pipe P on the suction part i side of the compressor 2 via the capillary tube 12. .

In this way, the gas-liquid separator 8, the muffler 17, the electric expansion valve 5 and the bypass on-off valve 11 are all oriented in the axial direction, and the connecting pipe group PG connected to these components is also mainly in the vertical direction. It is in a directed state.
In particular, the gas-liquid separator 8 is located in an intermediate portion between the other component parts and the connection pipe group PG, and on a space at a position spaced upward from the bottom plate 15 with the peripheral surface adjacent to the connection pipe group PG. Has been placed.

  Furthermore, the outer peripheral surface of the container main body 9 constituting the gas-liquid separator 8 and the connection pipe PB are integrally bound by a binding band (tie wrap) 20a which is a band-shaped member, and the gas-liquid separator 8 and the connection pipe PB. Are fixed to each other.

  At the lower end of the gas-liquid separator 8, the connection pipe PD and the connection pipe PC near the packed valve 7b are bound by a binding band 20b, and the connection pipes PD and PC are fixed to each other. At the upper end of the gas-liquid separator 8, the middle part of the connection pipe PB and the connection pipe PE is bound by a binding band 20c, and the connection pipes PB and PE are fixed to each other.

  In particular, both sides of the capillary tube 12 are fixed in the connection pipe PE. At the side of the gas-liquid separator 8, the connection pipe PC and the capillary tube 12 of the connection pipe PE are bound by a binding band 20d, and the connection pipes PC and PE are fixed to each other.

  Eventually, the container main body 9 itself in the gas-liquid separator 8, the connection pipe PD connected to the inlet part d, the connection pipe PC connected to the liquid side outlet part e, and the connection pipe PD connected to the gas side outlet part f. The four places are bound and fixed by binding bands (tie wraps) 20a to 20d which are mutually or adjacent connecting pipes and band-like members.

Next, the cooling operation will be described.
The compressor 2 is driven, and a high-pressure and high-temperature gas refrigerant that is a gas-liquid two-phase flow including the liquid phase is discharged to the refrigerant pipe P. In FIG. 1, as indicated by a thick broken line arrow, it is led to the outdoor heat exchanger 4 via the four-way switching valve 3 to be condensed and liquefied. However, in a gas-liquid two-phase flow state in which the liquid phase component is also included in the liquid refrigerant, the liquid refrigerant is led out to the connection pipe PA and led to the electric expansion valve 5 to be adiabatically expanded.

  The electric expansion valve 5 leads to the connection pipe PB and is introduced into the container body 9 from the inlet portion d of the gas-liquid separator 8 configured as described above. The refrigerant flows into the narrow space in the state of the gas-liquid two-phase flow, and further, the flow path area is expanded at the rapidly expanding portion in the gas-liquid separation chamber. After that, it is guided along the groove of the grooved body, where the liquid phase component is held in the groove by the action of surface tension.

  The gas phase component is separated from the liquid phase component, goes out of the groove, and is led to the gas side outlet portion f. The liquid phase component is collected at the inner bottom of the container body 9 and then led out from the liquid side outlet e. That is, the liquid refrigerant separated from the gas-liquid separator 8 to the connection pipe PC is led out and led to the indoor heat exchanger 6 of the indoor unit 1B through the packed valve 7b as indicated by the solid line arrow in the figure.

  The liquid refrigerant evaporates in the indoor heat exchanger 6, takes away the latent heat of evaporation from the indoor air flowing there, and changes it into cold air. The cold air is blown out into the room and has a cooling effect. The evaporated refrigerant leaves the indoor unit 1B and is guided to the packed valve 7a.

  The evaporated refrigerant is led again from the packed valve 7a to the refrigerant pipe P of the outdoor unit 1A, and is sucked into the suction portion i of the compressor 2 through the four-way switching valve 3, as indicated by a thin broken arrow. The refrigerant temperature is detected by the temperature sensor 13 during the period from the four-way switching valve 3 to the compressor suction part i. The refrigerant sucked into the compressor 2 is compressed again, and the above cycle is repeated.

  On the other hand, the gas refrigerant, which is the gas phase separated by the gas-liquid separator 8, is bypassed as indicated by a thin broken line arrow only when a predetermined condition described later is met and the bypass on-off valve 11 is opened. Guided to circuit 10. This gas refrigerant is led from the gas-liquid separator 8 to the connection pipe PD, flows through the bypass opening / closing valve 11, and is further led to the connection pipe PE.

  In the connection pipe PE, the flow rate is reduced by the capillary tube 12 and then sucked into the compressor 2 through the refrigerant pipe P communicating with the suction portion i of the compressor 2 from the connection pipe PE. The compressor 2 receives the evaporative refrigerant guided through the four-way switching valve 3 and the refrigerant pipe P and the gas refrigerant guided through the bypass circuit 10 from the gas-liquid separator 8, thereby increasing the compression capacity.

When the air conditioner ensures a certain capacity during the cooling operation without the gas-liquid separator 8, the bypass on-off valve 11 of the bypass circuit 10 is kept closed.
For example, if the bypass on-off valve 11 is always opened during the cooling operation, and the gas refrigerant separated from the gas-liquid separator 8 through the bypass circuit 10 is guided to the compressor 2, the compressor 2 operates at a low speed. When driven at a frequency, the liquid return amount increases, leading to deterioration of reliability. By controlling as described above, it is possible to improve the reliability of the compressor.

  When the compressor 2 requiring high cooling capacity is driven at a high operating frequency, the bypass on-off valve 11 is opened and the gas refrigerant separated by the gas-liquid separator 8 is guided to the compressor 2. Control as follows.

  On the other hand, vibration is generated as the compressor 2 is driven. If no measures are taken, the vibration of the compressor 2 propagates and expands to components such as the gas-liquid separator 8 disposed around the compressor 2 and the refrigerant pipe P connected to the compressor 2. If it is left as it is, there is a risk that components such as the compressor 2 and the gas-liquid separator 8 and the connection part of the refrigerant pipe P will be damaged and eventually damaged.

  Here, in the outdoor unit 1A, the refrigerant pipe P including the connection pipe groups PA to PE is basically provided in the vertical direction, and the components such as the gas-liquid separator 8 connected to the refrigerant pipe P are arranged in the vertical direction. It is arranged toward. Therefore, the influence of vibration transmitted directly and indirectly from the compressor 2 to the refrigerant pipe P and the components can be reduced.

  Furthermore, the gas-liquid separator 8 was disposed above the bottom plate 15 in the machine room Rb and in the gaps between the connection pipe groups PA to PE while connecting the outdoor heat exchanger 4 and the compressor 2. Therefore, a space necessary for attaching the gas-liquid separator 8 using a dedicated fixing tool is not required, and the storage space of the machine room Rb is made compact, which contributes to downsizing of the outdoor unit 1A.

  A bypass circuit 10 for guiding the gas refrigerant separated by the gas-liquid separator 8 is connected to the refrigerant pipe P communicating with the suction part i of the compressor 2, and the refrigerant temperature for controlling the opening degree of the electric expansion valve 5 is set. The temperature sensor 13 to be detected is disposed upstream of the connection portion between the refrigerant pipe P communicating with the suction portion i of the compressor 2 and the gas-liquid separator 8 and the bypass circuit 10.

  Therefore, the opening degree of the electric expansion valve 5 is controlled by the temperature state of the refrigerant guided to the refrigerant pipe P communicating with the compressor suction part i, and the refrigerant circulation amount is controlled to the optimum state. By specifying the mounting position of the temperature sensor 13, even if there is a temperature variation of the gas refrigerant guided through the bypass circuit 10, the temperature detected by the temperature sensor 13 is not affected, and the electric expansion valve 5 is always optimal. It works.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above-described embodiments.

The refrigeration cycle block diagram of the air conditioner based on one embodiment in this invention. The external appearance perspective view of the gas-liquid separator based on the embodiment. The internal perspective view of the outdoor unit based on the embodiment. The perspective view explaining the piping structure of the gas-liquid separator and connection piping group based on the embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1A ... Outdoor unit, 2 ... Compressor, 4 ... Outdoor heat exchanger, 5 ... Electric expansion valve, 1B ... Indoor unit, 6 ... Indoor heat exchanger, P ... Refrigerant piping, 8 ... Gas-liquid separator, 10 ... Bypass Circuit 11, bypass valve, 12 capillary tube, Rb machine room, 15 bottom plate, a outdoor heat exchanger outlet, b electric expansion valve inlet, c electric expansion valve outlet, d gas Liquid separator inlet, e ... Gas-liquid separator liquid side outlet, 7b ... Packed valve, f ... Gas-liquid separator gas side outlet, g ... Bypass on / off valve inlet, h ... Bypass on / off valve outlet, i ... Compressor suction part, PG ... Connection piping group, 13 ... Temperature sensor, 20a-20d ... Bundling band (band-like member).

Claims (1)

A compressor, an outdoor heat exchanger, an electric expansion valve (PMV) accommodated in the outdoor unit, and an indoor heat exchanger accommodated in the indoor unit are sequentially connected via a refrigerant pipe to constitute a refrigeration cycle, A gas-liquid separator provided in a refrigerant pipe connecting the electric expansion valve and the indoor heat exchanger is accommodated in the outdoor unit, and the gas refrigerant separated by the gas-liquid separator is supplied to the compressor. In the air conditioner provided with a return bypass circuit and provided with a bypass opening and closing valve and a capillary tube in the bypass circuit,
A connection pipe PA connecting the outlet portion of the outdoor heat exchanger and the inlet portion of the electric expansion valve;
A connection pipe PB that connects the electric expansion valve outlet and the gas-liquid separator inlet;
A connection pipe PC for connecting the liquid side outlet of the gas-liquid separator and a packed valve connected to the indoor unit;
A connection pipe PD for connecting a gas side outlet of the gas-liquid separator and a bypass on-off valve inlet in the bypass circuit;
A bypass pipe on the bypass circuit, and a connection pipe PE that connects the refrigerant pipe on the compressor suction part side through the capillary tube,
The gas-liquid separator is disposed adjacent to a connection pipe group composed of the connection pipes PA to PE in an upper space separated from a machine room bottom plate of the outdoor unit that houses the compressor .
A temperature sensor for detecting a refrigerant temperature for controlling the opening degree of the electric expansion valve is attached upstream of the connection site of the connection pipe PE in the refrigerant pipe on the compressor suction portion side. An air conditioner characterized by that.

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