JP7191230B2 - air conditioner - Google Patents

Description

The present invention relates to an air conditioner provided with a receiver.

2. Description of the Related Art Conventionally, an air conditioner provided with a receiver in which surplus refrigerant is stored is known. In such an air conditioner, the receiver is provided between the condenser and the evaporator, and stores the refrigerant that has flowed in from the condenser, thereby reducing the amount of refrigerant flowing through the evaporator according to the load fluctuation of the air conditioner. It is an adjustment. Some receivers of these air conditioners operate as a gas-liquid separation device by forming a swirling flow in the refrigerant that has flowed in from the condenser.

In Patent Document 1, inside a receiver that operates as a gas-liquid separation device by forming a swirl flow in the refrigerant, an opening of a pipe connected from the condenser is provided so as to be positioned in the liquid-phase refrigerant. An air conditioner is disclosed. In the air conditioner of Patent Document 1, the refrigerant flowing from the condenser is released into the liquid-phase refrigerant, thereby suppressing vaporization. The air conditioner of Patent Document 1 thereby sends more liquid-phase refrigerant to the evaporator, thereby improving the heat exchange efficiency.

JP 2017-20660 A

However, the receiver of the air conditioner disclosed in Patent Document 1 is provided with a heat exchange tube that flows the refrigerant sucked into the compressor and exchanges heat between the internal refrigerant and the refrigerant stored in the receiver. Not done. For this reason, even if the refrigerant inside the receiver swirls and flows, the medium-temperature, medium-pressure refrigerant flowing from the receiver to the evaporator side does not exchange heat with the low-temperature, low-pressure refrigerant flowing through the heat exchange tubes, and the dryness is high. Therefore, the air conditioner of Patent Document 1 cannot increase the amount of heat exchanged in the condenser, and cannot improve the efficiency of the refrigeration cycle.

The present invention has been made to solve the above problems, and provides an air conditioner that improves the efficiency of the refrigeration cycle by increasing the amount of heat exchanged in the condenser.

An air conditioner according to the present invention includes a refrigerant circuit in which a compressor, a condenser, an expansion section, a receiver, and an evaporator are connected by pipes and a refrigerant flows, the pipes are provided in the center of the receiver, and the compressor A heat exchange pipe for exchanging heat between the internal refrigerant and the refrigerant stored in the receiver, and a receiver pipe inserted inside the receiver, wherein the receiver pipe has an inflow pipe whose one end is connected to the condenser and the other end is inserted into the outer peripheral side of the heat exchange pipe inside the receiver and flows refrigerant into the receiver, and the other end of the inflow pipe is connected to the heat exchange Extending along the circumference centered on the pipe, the heat exchange pipe communicates the inside of the receiver with the suction pipe connected to the suction side of the compressor, and the refrigerant flows inside and the refrigerant is decompressed in the lower part. It is a bypass pipe provided with a decompression unit that

According to the present invention, the inflow pipe for inflowing the refrigerant into the receiver is inserted inside the receiver and extends along the circumference around the heat exchange pipe. Therefore, inside the receiver, the refrigerant flowing from the inflow pipe swirls around the central heat exchange tube. At this time, the refrigerant is separated into a gas phase and a liquid phase, and the liquid phase refrigerant forms a vortex with a concave center and a raised outer periphery. That is, the area of contact of the medium-temperature, medium-pressure vapor-phase refrigerant with the heat exchange tubes increases. This promotes heat exchange between the low-temperature, low-pressure refrigerant flowing inside the heat exchange tube and the medium-temperature, medium-pressure refrigerant stored in the receiver, and the dryness of the refrigerant flowing from the receiver to the evaporator side becomes low. . Therefore, the heat exchange amount in the condenser increases. Therefore, the efficiency of the refrigeration cycle can be improved.

1 is a circuit diagram showing air conditioner 100 according to Embodiment 1. FIG. 2 is a front view showing receiver 16 according to Embodiment 1. FIG. 2 is a top view showing receiver 16 according to Embodiment 1. FIG. 2 is a perspective view showing receiver 16 according to Embodiment 1. FIG. 2 is a front view showing receiver 16 according to Embodiment 1. FIG. FIG. 11 is a front view showing receiver 216 according to a comparative example of Embodiment 1; FIG. 11 is a top view showing receiver 216 according to a comparative example of Embodiment 1; FIG. 10 is a circuit diagram showing air conditioner 200 according to Embodiment 2. FIG. FIG. 11 is a front view showing receiver 116 according to Embodiment 2;

Embodiment 1.
Hereinafter, the air conditioner 100 according to Embodiment 1 will be described with reference to the drawings. FIG. 1 is a circuit diagram showing an air conditioner 100 according to Embodiment 1. FIG. As shown in FIG. 1, the air conditioner 100 has an outdoor unit 1, an indoor unit 2, and refrigerant pipes 3. Although one indoor unit 2 is illustrated in FIG. 1, the number of indoor units 2 may be two or more.

(Outdoor unit 1, indoor unit 2, refrigerant pipe 3)
The outdoor unit 1 has a compressor 11 , a channel switching device 12 , an outdoor heat exchanger 13 , an outdoor fan 14 , an expansion section 15 and a receiver 16 . The indoor unit 2 has an indoor heat exchanger 21 and an indoor fan 22 . The refrigerant pipe 3 connects the compressor 11, the flow switching device 12, the outdoor heat exchanger 13, the expansion section 15, the receiver 16, and the indoor heat exchanger 21, and the refrigerant flows therein to form the refrigerant circuit 4. It is something to do. The refrigerant pipe 3 has a heat exchange pipe 31 and a receiver pipe 32 .

(Compressor 11)
The compressor 11 sucks a low-temperature, low-pressure refrigerant, compresses the sucked refrigerant, converts it into a high-temperature, high-pressure refrigerant, and discharges it. The compressor 11 is, for example, an inverter compressor driven by a motor (not shown) whose frequency is controlled by an inverter (not shown).

(Channel switching device 12)
The flow switching device 12 switches the flow direction of the refrigerant in the refrigerant circuit 4, and is, for example, a four-way valve. The flow switching device 12 connects the discharge side of the compressor 11 and the outdoor heat exchanger 13 and connects the suction side of the compressor 11 and the indoor heat exchanger 21 during cooling operation. Further, the flow switching device 12 connects the discharge side of the compressor 11 and the indoor heat exchanger 21 and connects the suction side of the compressor 11 and the outdoor heat exchanger 13 during heating operation. . The channel switching device 12 may be a combination of a plurality of two-way valves, instead of a four-way valve, to have the same function as a four-way valve.

(Outdoor heat exchanger 13, outdoor fan 14)
The outdoor heat exchanger 13 exchanges heat between refrigerant and outdoor air, and is, for example, a fin-and-tube heat exchanger. The outdoor heat exchanger 13 acts as a condenser during cooling operation and acts as an evaporator during heating operation. The outdoor blower 14 is a device that sends outdoor air to the outdoor heat exchanger 13 .

(Inflatable portion 15)
The expansion unit 15 is a pressure reducing valve or an expansion valve that reduces the pressure of the refrigerant to expand it. In Embodiment 1, the inflatable portion 15 has a first inflatable portion 41 and a second inflatable portion 42 . One side of the first expansion section 41 is connected to the outdoor heat exchanger 13 and the other side is connected to the receiver 16 . One side of the second expansion section 42 is connected to the receiver 16 and the other side is connected to the indoor heat exchanger 21 .

(Receiver 16)
The receiver 16 has a substantially cylindrical shape and is composed of a bottom portion 51 , a side portion 52 and a top portion 53 . The bottom surface portion 51 is a substantially circular plate-like member that constitutes the bottom surface of the receiver 16 . The side surface portion 52 is a member that extends upward from the circumference of the bottom surface portion 51 and constitutes the side surface of the receiver 16 . The upper surface portion 53 is a substantially circular plate-like member that is connected to the upper end of the side surface portion 52 and covers the upper surface of the receiver 16 . The receiver 16 is a container that stores surplus refrigerant in the refrigerant circuit 4 that increases or decreases according to load fluctuations of the air conditioner 100 . The receiver 16 is provided between the first expansion section 41 and the second expansion section 42 as described above. Note that the receiver 16 may be provided in the indoor unit 2 instead of the outdoor unit 1, or may be provided in a device other than the outdoor unit 1 and the indoor unit 2.

(Indoor heat exchanger 21, indoor fan 22)
The indoor heat exchanger 21 exchanges heat between the indoor air and the refrigerant. The outdoor heat exchanger 13 acts as an evaporator during cooling operation, and acts as a condenser during heating operation. The indoor blower 22 is a device that sends indoor air to the indoor heat exchanger 21, and is, for example, a cross-flow fan.

(Heat exchange tube 31)
FIG. 2 is a front view showing the receiver 16 according to Embodiment 1. FIG. FIG. 3 is a top view showing the receiver 16 according to Embodiment 1. FIG. The heat exchange pipe 31 is a suction pipe having one end connected to the evaporator and the other end connected to the suction side of the compressor 11 and through which the refrigerant sucked into the compressor 11 flows. As shown in FIGS. 2 and 3 , the heat exchange tube 31 is drawn into the receiver 16 through the upper surface portion 53 of the receiver 16 such that a portion of the heat exchange tube 31 is positioned centrally within the receiver 16 . Refrigerant sucked into the compressor 11 flows inside the heat exchange tube 31 drawn into the receiver 16 , and heat is generated between the refrigerant flowing inside the heat exchange tube 31 and the refrigerant stored in the receiver 16 . make an exchange.

(cooling operation)
Here, the operation of the air conditioner 100 will be described. First, the cooling operation will be explained. In the cooling operation, the refrigerant sucked into the compressor 11 is compressed by the compressor 11 and discharged in a high-temperature and high-pressure gas state. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 11 passes through the flow path switching device 12 and flows into the outdoor heat exchanger 13 acting as a condenser. The refrigerant that has flowed into the outdoor heat exchanger 13 exchanges heat with the outdoor air sent by the outdoor fan 14, condenses, and liquefies. The liquid state refrigerant flows into the first expansion section 41, is decompressed and expanded, and becomes medium-temperature, medium-pressure gas-liquid two-phase refrigerant. Medium temperature and medium pressure refrigerant flows into the receiver 16 and is stored therein.

The stored refrigerant exchanges heat with the low-temperature refrigerant flowing through the heat exchange tubes 31 to become less dry and flows out from the receiver 16 . The refrigerant whose dryness has become low flows into the second expansion section 42 and is decompressed. The decompressed refrigerant flows into the indoor heat exchanger 21 acting as an evaporator. The refrigerant that has flowed into the indoor heat exchanger 21 exchanges heat with the indoor air sent by the indoor fan 22 to evaporate and gasify. At that time, the room air is cooled to cool the room. Thereafter, the vaporized low-temperature, low-pressure gaseous refrigerant passes through the channel switching device 12 and flows through the heat exchange tubes 31 . The low-temperature, low-pressure refrigerant flowing through the heat exchange tube 31 exchanges heat with the medium-temperature, medium-pressure refrigerant stored in the receiver 16, thereby increasing the degree of superheat. The refrigerant with an increased degree of superheat is sucked into the compressor 11 .

(heating operation)
Next, the heating operation will be explained. In the heating operation, the refrigerant sucked into the compressor 11 is compressed by the compressor 11 and discharged in a high-temperature and high-pressure gas state. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 11 passes through the flow path switching device 12 and flows into the indoor heat exchanger 21 acting as a condenser. The refrigerant that has flowed into the indoor heat exchanger 21 exchanges heat with indoor air sent by the indoor fan 22, condenses, and liquefies. At that time, the room air is warmed, and the room is heated. The liquid state refrigerant flows into the second expansion section 42, where it is decompressed and expanded to become medium-pressure, medium-temperature gas-liquid two-phase refrigerant. Medium-pressure, medium-temperature refrigerant flows into the receiver 16 and is stored therein.

The stored refrigerant exchanges heat with the low-temperature refrigerant flowing through the heat exchange tubes 31 inside the receiver 16 , so that the dryness of the refrigerant becomes low and flows out of the receiver 16 . The refrigerant whose dryness has become low flows into the first expansion section 41 and is decompressed. The decompressed refrigerant flows into the outdoor heat exchanger 13 which acts as an evaporator. The refrigerant that has flowed into the outdoor heat exchanger 13 exchanges heat with the outdoor air sent by the outdoor fan 14 to evaporate and gasify. Thereafter, the vaporized low-temperature, low-pressure gaseous refrigerant passes through the channel switching device 12 and flows through the heat exchange tubes 31 . The low-temperature, low-pressure refrigerant flowing through the heat exchange tube 31 exchanges heat with the medium-temperature, medium-pressure refrigerant stored in the receiver 16, thereby increasing the degree of superheat. The refrigerant with an increased degree of superheat is sucked into the compressor 11 .

(Receiver piping 32)
The receiver pipe 32 is a pipe connected to the receiver 16 and has an inflow pipe 43 and an outflow pipe 44 . The inflow pipe 43 is a pipe whose one end 43a is connected to the condenser and whose other end 43b is inserted into the receiver 16 through the upper surface portion 53 so that the refrigerant flows into the receiver 16 . The other end 43b of the inflow pipe 43 is located on the outer peripheral side of the heat exchange tube 31 and near the bottom surface portion 51, and is bent along the circumference C with the heat exchange tube 31 at the center. Therefore, the refrigerant flowing from the inflow pipe 43 flows in the direction of arrow D in FIG. The other end 43b of the inflow pipe 43 only needs to extend along the circumference C. For example, the other end 43b may be inserted from the side surface portion 52 and extended without bending.

FIG. 4 is a perspective view showing receiver 16 according to the first embodiment. As shown in FIG. 4, the other end 43b of the inflow pipe 43 is formed obliquely so that the side surface portion 52 side of the receiver 16 is longer. As long as the shape of the other end 43b of the inflow pipe 43 is formed so as to guide the refrigerant flowing in the direction in which the inflow pipe 43 extends, the side wall side of the receiver 16 does not have to be obliquely formed so as to be long. good. Furthermore, the other end 43b of the inflow pipe 43 does not have to be oblique. In this case, formability is improved in manufacturing the inflow pipe 43 .

One end 44 a of the outflow pipe 44 is inserted into the receiver 16 through the upper surface portion 53 of the receiver 16 , and the other end 44 b is connected to the evaporator to flow the refrigerant out of the receiver 16 . One end 44a of the outflow pipe 44 is located near the bottom of the heat exchange pipe 31 on the outer peripheral side, and extends in the same circumferential direction as the other end 44b of the inflow pipe 43 so as to follow the circumference C around the heat exchange pipe 31. bent. The other end 44b of the outflow pipe 44 may extend along the circumference C, for example, may be inserted from the side surface portion 52 and extended without bending.

Also, the one end 44a of the outflow pipe 44 may not be inserted so as to be positioned on the outer peripheral side of the heat exchange tube 31 inside the receiver 16. 16 may be inserted in the bottom surface. Furthermore, the other end 44b of the outflow pipe 44 may not extend in the same circumferential direction as the other end 43b of the inflow pipe 43, and may extend in the circumferential direction facing the inflow pipe 43, for example. In these cases, the refrigerant stored in the receiver 16 flows out more smoothly.

Further, as shown in FIG. 4, one end 44a of the outflow pipe 44 is obliquely formed. In addition, the shape of the one end 44a of the outflow pipe 44 does not have to be oblique. In this case, formability is improved in manufacturing the inflow pipe 43 . In the first embodiment, the inflow pipe 43 and the outflow pipe 44 are named based on the flow of refrigerant during cooling operation. It flows out from 43.

FIG. 5 is a front view showing the receiver 16 according to Embodiment 1. FIG. Here, movement of the refrigerant inside the receiver 16 will be described with reference to FIG. 5 . The refrigerant flowing in from the inflow pipe 43 swirls in the V direction around the heat exchange tube 31 provided in the center inside the receiver 16 . At this time, the refrigerant is separated into a vapor phase and a liquid phase, and the liquid phase refrigerant forms a vortex, for example, a parabolic P-shaped vortex with a depressed center and a raised outer periphery. That is, the inside of the receiver 16 presents an aspect in which the central portion O is occupied by the vapor-phase refrigerant, and the lower and outer peripheral side thereof is occupied by the liquid-phase refrigerant.

According to Embodiment 1, the inflow pipe 43 for flowing the refrigerant into the receiver 16 is inserted inside the receiver 16 and extends along the circumference C around the heat exchange tube 31 . Therefore, inside the receiver 16, the refrigerant flowing from the inflow pipe 43 swirls around the heat exchange tube 31 provided in the center. At this time, the refrigerant is separated into a gas phase and a liquid phase, and the liquid phase refrigerant forms a vortex with a concave center and a raised outer periphery. That is, the area of contact of the medium-temperature, medium-pressure vapor-phase refrigerant with the heat exchange tubes 31 increases. This promotes heat exchange between the low-temperature, low-pressure refrigerant flowing inside the heat exchange tube 31 and the medium-temperature, medium-pressure refrigerant stored in the receiver 16, and the refrigerant flowing from the receiver 16 to the evaporator side has a dryness becomes lower. Therefore, the heat exchange amount in the condenser increases. Therefore, the efficiency of the refrigeration cycle can be improved. At this time, the enthalpy lost by the refrigerant flowing from the receiver 16 to the evaporator side moves to the refrigerant flowing inside the heat exchange tube 31, so the heat quantity is maintained in the entire refrigeration cycle.

Furthermore, the liquid-phase coolant forms a vortex with a concave center and a raised outer periphery. That is, the height of the refrigerant inside the receiver 16 is higher on the side portion 52 side. Therefore, even when the amount of liquid-phase refrigerant stored inside the receiver 16 is small, the one end 44a of the outflow pipe 44 is positioned in the liquid-phase refrigerant. Therefore, the outflow pipe 44 can reliably cause the liquid-phase refrigerant to flow out from the receiver 16 .

In addition, according to the first embodiment, the one end 44a of the outflow pipe 44 is inserted inside the receiver 16 so as to be positioned on the outer peripheral side of the heat exchange pipe 31, and is circumferentially around the heat exchange pipe 31. It extends along C. Therefore, regardless of whether the outdoor heat exchanger 13 and the indoor heat exchanger 21 connected to the inflow pipe 43 and the outflow pipe 44 function as a condenser or an evaporator, the refrigerant flowing into the receiver 16 revolves around a heat exchange tube 31 provided in the center. Therefore, the receiver 16 can be used for both cooling operation and heating operation.

Further, according to the first embodiment, the other end 43b of the inflow pipe 43 is obliquely formed so that the side wall side of the receiver 16 is longer. As a result, the refrigerant flowing from the inflow pipe 43 swirls around the heat exchange pipe 31 inside the receiver 16 more vigorously. For this reason, the vortex formed by the liquid-phase refrigerant forms a larger vortex with a depressed center and a raised outer periphery. That is, the contact area of the medium-pressure vapor-phase refrigerant with the heat exchange tubes 31 further increases. As a result, heat exchange between the low-temperature, low-pressure refrigerant flowing inside the heat exchange tube 31 and the medium-temperature, medium-pressure refrigerant stored in the receiver 16 is further promoted, and the refrigerant flowing from the receiver 16 to the evaporator side is further less dry. Therefore, the amount of heat exchange in the condenser is further increased. Therefore, the efficiency of the refrigeration cycle can be further improved.

Furthermore, one end 44a of the outflow pipe 44 is obliquely formed. Therefore, the opening formed at the one end 44a of the outflow pipe 44 has a large cross-sectional area. Therefore, the liquid-phase refrigerant can easily flow into the one end 44 a of the outflow pipe 44 , and the outflow pipe 44 can reliably cause the liquid-phase refrigerant to flow out from the receiver 16 .

FIG. 6 is a front view showing receiver 216 according to a comparative example of the first embodiment. FIG. 7 is a top view showing receiver 216 according to a comparative example of the first embodiment. Here, the receiver 16 of the first embodiment will be described in comparison with the receiver 216 of the comparative example. As shown in FIGS. 6 and 7, the other end 243b of the inflow pipe 243 and the one end 244a of the outflow pipe 244 are inserted through the upper surface portion 53 of the receiver 216 and extend downward. That is, the other end 243b of the inflow pipe 43 and the one end 244a of the outflow pipe 44 do not extend along the circumference C around the heat exchange pipe 31 . Therefore, the coolant that has flowed in from the inflow pipe 243 flows in the direction of arrow E in FIG. At that time, since the refrigerant becomes a natural convection inside the receiver 216 , the liquid-phase refrigerant stays on the liquid surface L and does not swirl around the heat exchange tubes 31 . That is, the contact area of the medium-pressure vapor-phase refrigerant with the heat exchange tubes 31 does not increase. Therefore, heat exchange between the refrigerant flowing inside the heat exchange and the refrigerant stored in the receiver 216 is not promoted.

On the other hand, according to the first embodiment, the inflow pipe 43 for flowing the refrigerant into the receiver 16 is inserted inside the receiver 16 and extends along the circumference C around the heat exchange pipe 31. there is Therefore, inside the receiver 16, the refrigerant flowing from the inflow pipe 43 swirls around the heat exchange tube 31 provided in the center. At this time, the refrigerant is separated into a gas phase and a liquid phase, and the liquid phase refrigerant forms a vortex with a concave center and a raised outer periphery. That is, the area of contact of the intermediate-pressure vapor-phase refrigerant with the heat exchange tubes 31 increases. This promotes heat exchange between the low-temperature, low-pressure refrigerant flowing inside the heat exchange tube 31 and the medium-temperature, medium-pressure refrigerant stored in the receiver 16, and the refrigerant flowing from the receiver 16 to the evaporator side has a dryness becomes lower. Therefore, the heat exchange amount in the condenser increases. Therefore, the efficiency of the refrigeration cycle can be improved.

Embodiment 2.
FIG. 8 is a circuit diagram showing air conditioner 200 according to Embodiment 2. As shown in FIG. FIG. 9 is a front view showing receiver 116 according to the second embodiment. As shown in FIGS. 8 and 9, the second embodiment is different from the first embodiment in that the heat exchange pipe 131 is a bypass pipe that communicates the inside of the receiver 116 and the intake pipe 181 . In the second embodiment, the same reference numerals are assigned to the same parts as in the first embodiment, and the description thereof is omitted.

(Suction pipe 181, heat exchange pipe 131)
Unlike the first embodiment, suction pipe 181 is not pulled into receiver 116 . The heat exchange pipe 131 is a bypass pipe that allows the inside of the receiver 116 and the suction pipe 181 to communicate with each other, and through which the refrigerant flows. Refrigerant sucked into the compressor 11 flows inside the heat exchange tube 131 , and the heat exchange tube 131 exchanges heat between the refrigerant flowing inside and the refrigerant stored in the receiver 116 . A decompression section 182 for decompressing the refrigerant is provided below the heat exchange tube 131 . The decompression unit 182 is, for example, an orifice or a decompression valve.

(cooling operation, heating operation)
Here, the operation of the air conditioner 200 will be described, focusing on the differences from the first embodiment. During both the cooling operation and the heating operation, part of the liquid-phase refrigerant stored in the receiver 116 is decompressed through the decompression part 182 of the heat exchange tube 131, and is shown by the arrow F in FIG. directionally pumped. At this time, the low-temperature, low-pressure refrigerant flowing through the heat exchange tubes 131 exchanges heat with the medium-temperature, medium-pressure vapor-phase refrigerant outside the heat exchange tubes 131 inside the receiver 116 . The dryness of the liquid-phase refrigerant decreases, the flow rate of the refrigerant pumped up to the heat exchange tube 131 decreases, and the remaining refrigerant flows out from the receiver 116 . The refrigerant flowing through the heat exchange pipe 131 increases in degree of superheat and joins the suction pipe 181 . The refrigerant that joins the suction pipe 181 is sucked into the compressor 11 .

According to the second embodiment, inside the receiver 116, the refrigerant flowing from the inflow pipe 43 swirls around the bypass pipe functioning as the heat exchange pipe 131 provided in the center. This promotes heat exchange between the low-temperature, low-pressure refrigerant flowing inside the heat exchange tube 131 and the medium-temperature, medium-pressure refrigerant stored in the receiver 116, and the refrigerant flowing from the receiver 116 to the evaporator side has a dryness becomes lower. Therefore, the heat exchange amount in the condenser increases. Therefore, the efficiency of the refrigeration cycle can be improved. At this time, the enthalpy lost by the refrigerant flowing from the receiver 116 to the evaporator side is transferred to the refrigerant flowing inside the heat exchange tube 131, so the heat quantity is maintained in the entire refrigeration cycle. Furthermore, the refrigerant flowing from the receiver 116 to the evaporator side has a reduced flow rate. Therefore, the air conditioner 200 can increase the suction pressure of the compressor 11 and further improve the efficiency of the refrigeration cycle by reducing the pressure loss in the condenser.

1 outdoor unit 2 indoor unit 3 refrigerant pipe 4 refrigerant circuit 11 compressor 12 flow path switching device 13 outdoor heat exchanger 14 outdoor fan 15 expansion unit 16 receiver 21 indoor heat exchanger 22 Indoor blower, 31 heat exchange tube, 32 receiver pipe, 41 first expansion section, 42 second expansion section, 43 inflow pipe, 43a one end, 43b other end, 44 outflow pipe, 44a one end, 44b other end, 100 air Conditioner 116 Receiver 131 Heat exchange tube 181 Suction pipe 182 Pressure reducing unit 200 Air conditioner 216 Receiver 243 Inflow pipe 243a One end 243b Other end 244 Outflow pipe 244a One end 244b Other end.

Claims (3)

A refrigerant circuit in which a compressor, a condenser, an expansion section, a receiver and an evaporator are connected by piping and a refrigerant flows,
The piping is
a heat exchange tube provided in the center of the inside of the receiver, through which the refrigerant sucked into the compressor flows and exchanges heat between the internal refrigerant and the refrigerant stored in the receiver;
a receiver pipe inserted inside the receiver,
The receiver piping is
An inflow pipe having one end connected to the condenser and the other end inserted to the outer peripheral side of the heat exchange tube inside the receiver and flowing refrigerant into the receiver,
The other end of the inflow pipe is
Extending along the circumference centered on the heat exchange tube ,
The heat exchange tubes are
A bypass pipe that communicates the inside of the receiver with a suction pipe that is connected to the suction side of the compressor, in which a refrigerant flows and a decompression part that decompresses the refrigerant is provided at the bottom.
Air conditioner. The receiver piping is
An outflow pipe having one end inserted into the outer periphery of the heat exchange tube inside the receiver and having the other end connected to the evaporator for flowing out the refrigerant from the receiver,
One end of the outflow pipe is
The air conditioner according to claim 1, which extends along a circumference centering on the heat exchange tube. In the receiver pipe, the end inserted inside the receiver is
The air conditioner according to claim 1 or 2, which is obliquely formed.

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