JPWO2019244267A1 - Refrigeration cycle equipment - Google Patents

Abstract

The refrigeration cycle device (10) includes a refrigerant circuit (RC) and a strainer. The strainer is connected to at least one of a pipe (80) connecting the compressor (20) and the condenser and a pipe (80) connecting the expansion valve (40) and the evaporator. When the strainer is connected to the pipe (80) connecting the compressor (20) and the condenser, the length of the pipe (80) connecting the strainer and the condenser is the same as that of the compressor (20). It is shorter than the length of the pipe (80) connecting to the strainer. When the strainer is connected to the pipe (80) connecting the expansion valve (40) and the evaporator, the length of the pipe (80) connecting the strainer and the evaporator is the same as that of the expansion valve (40). It is shorter than the length of the pipe (80) connecting to the strainer.

Description

The present invention relates to a refrigeration cycle device.

Conventionally, it is known that sludge containing wear powder of a compressor, deteriorated product of refrigerating machine oil, and the like is generated in a pipe in a refrigerating cycle device. The sludge generated in the pipe flows into the heat transfer tube of the heat exchanger together with the refrigerant and adheres to the inner wall of the heat transfer tube. Adhesion of sludge to the inner wall of the heat transfer tube reduces the amount of refrigerant flowing in the heat transfer tube. Therefore, the heat transfer performance of the heat exchanger is lowered.

Therefore, a refrigeration cycle device provided with a strainer for capturing sludge flowing into the heat transfer tube of the heat exchanger has been proposed. A refrigeration cycle apparatus provided with this strainer is described in, for example, Japanese Patent Application Laid-Open No. 2006-207959 (Patent Document 1). In the refrigeration cycle apparatus described in this publication, two strainers are installed near the connection portion between the extension pipe and the heat source side unit.

Japanese Unexamined Patent Publication No. 2006-207959

In the refrigeration cycle apparatus described in the above publication, since the extension pipe is arranged between one strainer and the heat exchanger (condenser), it is between one strainer and the heat exchanger (condenser). The length of the piping becomes longer. Further, since the other strainer is arranged between the heat exchanger (condenser) and the expansion valve, the length of the pipe between the other strainer and the heat exchanger (evaporator) becomes long. Therefore, sludge is likely to be generated in the piping between the strainer and the heat exchanger, and the sludge flows into the heat exchanger, so that the heat transfer performance of the heat exchanger is likely to deteriorate.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a refrigeration cycle apparatus capable of suppressing a decrease in heat transfer performance of a heat exchanger due to sludge flowing into the heat exchanger. Is.

The refrigeration cycle apparatus of the present invention includes a refrigerant circuit and a strainer. The refrigerant circuit is connected by piping so that the refrigerant flows in the order of the compressor, the condenser, the expansion valve, and the evaporator. The strainer is connected to the refrigerant circuit and captures foreign matter mixed in the refrigerant. The strainer is connected to at least one of the pipes connecting the compressor and the condenser and the pipe connecting the expansion valve and the evaporator. When the strainer is connected to the pipe connecting the compressor and the condenser, the length of the pipe connecting the strainer and the condenser is shorter than the length of the pipe connecting the compressor and the strainer. When the strainer is connected to the pipe connecting the expansion valve and the evaporator, the length of the pipe connecting the strainer and the evaporator is shorter than the length of the pipe connecting the expansion valve and the strainer.

According to the refrigeration cycle apparatus of the present invention, when the strainer is connected to the pipe connecting the compressor and the condenser, the length of the pipe connecting the strainer and the condenser is the length of the pipe connecting the compressor and the strainer. Shorter than the length of the pipe connecting the. When the strainer is connected to the pipe connecting the expansion valve and the evaporator, the length of the pipe connecting the strainer and the evaporator is shorter than the length of the pipe connecting the expansion valve and the strainer. Therefore, by shortening the length of the pipe connecting the strainer and the condenser, it is possible to suppress the generation of sludge in the pipe. Further, by shortening the length of the pipe connecting the strainer and the evaporator, it is possible to suppress the generation of sludge in the pipe. Therefore, it is possible to suppress deterioration of the heat transfer performance of the heat exchanger due to sludge flowing into the heat exchanger.

It is a block diagram which shows the structure at the time of cooling operation of the refrigeration cycle apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure at the time of heating operation of the refrigeration cycle apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure at the time of a cooling operation of the refrigerating cycle apparatus of the modification 1 which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure at the time of a heating operation of the refrigerating cycle apparatus of the modification 1 which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure at the time of a cooling operation of the refrigerating cycle apparatus of the modification 2 which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure at the time of a heating operation of the refrigerating cycle apparatus of the modification 2 which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure at the time of a cooling operation of the refrigerating cycle apparatus of the modification 3 which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure at the time of a heating operation of the refrigerating cycle apparatus of the modification 3 which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure at the time of cooling operation of the refrigeration cycle apparatus which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure at the time of heating operation of the refrigeration cycle apparatus which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure at the time of the cooling operation of the refrigerating cycle apparatus of the modification 1 which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure at the time of a heating operation of the refrigerating cycle apparatus of the modification 1 which concerns on Embodiment 2 of this invention. It is a block diagram which shows the structure at the time of cooling operation of the refrigeration cycle apparatus which concerns on Embodiment 3 of this invention. It is a block diagram which shows the structure at the time of heating operation of the refrigeration cycle apparatus which concerns on Embodiment 3 of this invention. It is a block diagram which shows the structure at the time of a cooling operation of the refrigerating cycle apparatus of the modification 1 which concerns on Embodiment 3 of this invention. It is a block diagram which shows the structure at the time of a heating operation of the refrigerating cycle apparatus of the modification 1 which concerns on Embodiment 3 of this invention. It is a partial cross-sectional perspective view which shows the structure of the heat exchanger of the refrigeration cycle apparatus which concerns on Embodiment 4 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following, the items with the same reference numerals are the same or equivalent thereto, and this shall be common to the entire text of the specification. The form of the component represented in the entire specification is merely an example, and the present embodiment is not limited to the form described in the specification.

Embodiment 1.
The refrigeration cycle apparatus 10 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows the flow of the refrigerant during the cooling operation of the refrigeration cycle device 10 according to the first embodiment of the present invention. FIG. 2 shows the flow of the refrigerant during the heating operation of the refrigeration cycle device 10 according to the first embodiment of the present invention. In FIGS. 1 and 2, the flow of the refrigerant is indicated by the broken line arrow.

As shown in FIG. 1, the refrigeration cycle device 10 according to the present embodiment includes a compressor 20, an outdoor heat exchanger 30, an expansion valve 40, an indoor heat exchanger 50, a four-way valve 60, and a strainer. It includes a 71 and a strainer 72.

Further, the refrigeration cycle device 10 includes an outdoor unit 101 and an indoor unit 102. The outdoor unit 101 includes a compressor 20, an outdoor heat exchanger 30, an expansion valve 40, and a four-way valve 60. The indoor unit 102 houses the indoor heat exchanger 50, the strainer 71, and the strainer 72.

The compressor 20, the outdoor heat exchanger 30, the expansion valve 40, the indoor heat exchanger 50, and the four-way valve 60 constitute a refrigerant circuit RC. In the refrigerant circuit RC, the refrigerant flows in the order of the compressor 20, the condenser (outdoor heat exchanger 30 or indoor heat exchanger 50), the expansion valve 40, and the evaporator (indoor heat exchanger 50 or outdoor heat exchanger 30). Is connected to the pipe (refrigerant pipe) 80.

The compressor 20 is configured to compress and discharge the sucked refrigerant. The outdoor heat exchanger 30 is for exchanging heat between the refrigerant and the outdoor air. The expansion valve 40 is a throttle device that reduces the pressure of the refrigerant. The expansion valve 40 is, for example, a capillary tube, an electronic expansion valve, or the like. The indoor heat exchanger 50 is for exchanging heat between the refrigerant and the indoor air. Each of the outdoor heat exchanger 30 and the indoor heat exchanger 50 includes, for example, a pipe (heat transfer tube) through which the refrigerant flows inside, and fins attached to the outside of the pipe. Further, each of the outdoor heat exchanger 30 and the indoor heat exchanger 50 may include a header (distributor).

In this embodiment, the refrigerant circuit RC has a four-way valve 60. The four-way valve 60 is connected to the compressor 20, the outdoor heat exchanger 30, and the indoor heat exchanger 50 by a pipe 80. The four-way valve 60 is configured to switch the flow of the refrigerant from the compressor 20 to the outdoor heat exchanger 30 or the indoor heat exchanger 50 depending on the cooling operation and the heating operation. The refrigeration cycle device 10 is configured so that the refrigerant flow path can be changed by switching the valve of the four-way valve 60.

As shown in FIG. 1, during the cooling operation, the refrigerant circulates in the refrigerant circuit RC in the order of the compressor 20, the four-way valve 60, the outdoor heat exchanger 30, the expansion valve 40, the indoor heat exchanger 50, and the four-way valve 60. .. During the cooling operation, the outdoor heat exchanger 30 functions as a condenser, and the indoor heat exchanger 50 functions as an evaporator.

As shown in FIG. 2, during the heating operation, the valve of the four-way valve 60 is switched from the cooling operation. During the heating operation, the refrigerant circulates in the refrigerant circuit RC in the order of the compressor 20, the four-way valve 60, the indoor heat exchanger 50, the expansion valve 40, and the outdoor heat exchanger 30. During the heating operation, the outdoor heat exchanger 30 functions as an evaporator, and the indoor heat exchanger 50 functions as a condenser. That is, the outdoor heat exchanger 30 functions as either a condenser or an evaporator. Also, the indoor heat exchanger 50 functions as either a condenser or an evaporator.

The strainer is connected to the refrigerant circuit RC. The strainer is configured to capture foreign matter mixed in the refrigerant. The strainer has, for example, a net capable of catching foreign matter mixed in the refrigerant. The strainer is arranged on the inlet side of the heat exchanger in the refrigerant flow. In the present embodiment, the refrigeration cycle device 10 has a strainer 71 and a strainer 72 that function as strainers. Each of the strainer 71 and the strainer 72 may have a similar structure.

In the present embodiment, the strainer 71 is arranged between the pipe 80 connecting the compressor 20 and the indoor heat exchanger 50, and the strainer 71 is arranged between the pipe 80 connecting the indoor heat exchanger 50 and the expansion valve 40. 72 are arranged. More specifically, the strainer 71 is arranged between the four-way valve 60 and the pipe 80 connecting the indoor heat exchanger 50. In the present embodiment, the strainer 71 and the strainer 72 are connected to the refrigerant circuit RC before and after the indoor heat exchanger 50.

As shown in FIG. 1, during the cooling operation, the strainer 72 corresponds to the strainer and the first strainer described in the claims. During the cooling operation, the strainer 72 corresponding to the first strainer functions as a strainer. The strainer 72 is connected to a pipe 80 that connects the expansion valve 40 and the indoor heat exchanger 50 that is an evaporator. The length of the pipe 80 connecting the strainer 72 and the indoor heat exchanger 50 which is an evaporator is shorter than the length of the pipe 80 connecting the expansion valve 40 and the strainer 72.

Further, during the cooling operation, the strainer 71 corresponds to the second strainer described in the claims. The strainer 71 is connected to a pipe 80 that connects the indoor heat exchanger 50, which is an evaporator, and the compressor 20. The length of the pipe 80 connecting the strainer 71 and the indoor heat exchanger 50 which is an evaporator is shorter than the length of the pipe 80 connecting the compressor 20 and the strainer 71. Further, the length of the pipe 80 connecting the strainer 71 and the indoor heat exchanger 50 which is an evaporator is shorter than the length of the pipe 80 connecting the four-way valve 60 and the strainer 71.

As shown in FIG. 2, during the heating operation, the strainer 71 corresponds to the strainer and the second strainer described in the claims. During the heating operation, the strainer 71 corresponding to the second strainer functions as a strainer. The strainer 71 is connected to a pipe 80 that connects the compressor 20 and the indoor heat exchanger 50 which is a condenser. The length of the pipe 80 connecting the strainer 71 and the indoor heat exchanger 50 which is a condenser is shorter than the length of the pipe 80 connecting the compressor 20 and the strainer 71. Further, the length of the pipe 80 connecting the strainer 71 and the indoor heat exchanger 50 which is a condenser is shorter than the length of the pipe 80 connecting the four-way valve 60 and the strainer 71.

Further, during the heating operation, the strainer 72 corresponds to the first strainer described in the claims. The strainer 72 is connected to a pipe 80 that connects the indoor heat exchanger 50, which is a condenser, and the expansion valve 40. The length of the pipe 80 connecting the strainer 72 and the indoor heat exchanger 50 which is a condenser is shorter than the length of the pipe connecting the expansion valve 40 and the strainer 72.

Specifically, the pipe 80 includes a refrigerant pipe 81, a refrigerant pipe 82, a refrigerant pipe 83, and a refrigerant pipe 84. The four-way valve 60 and the strainer 71 are connected by a refrigerant pipe 81, and the strainer 71 and the indoor heat exchanger 50 are connected by a refrigerant pipe 82. The strainer 71 is arranged at a position closer to the indoor heat exchanger 50 than the four-way valve 60 in the refrigerant circuit RC. That is, the length of the refrigerant pipe 82 is shorter than the length of the refrigerant pipe 81.

Further, the indoor heat exchanger 50 and the strainer 72 are connected by a refrigerant pipe 83, and the strainer 72 and the expansion valve 40 are connected by a refrigerant pipe 84. The strainer 72 is arranged at a position closer to the indoor heat exchanger 50 than the expansion valve 40 in the refrigerant circuit RC. That is, the length of the refrigerant pipe 83 is shorter than the length of the refrigerant pipe 84.

As shown in FIG. 1, in the refrigerating cycle apparatus 10, during the cooling operation, the refrigerants are the compressor 20, the four-way valve 60, the outdoor heat exchanger 30, the expansion valve 40, the refrigerant pipe 84, the strainer 72, the refrigerant pipe 83, and the like. The indoor heat exchanger 50, the refrigerant pipe 82, the strainer 71, the refrigerant pipe 81, and the four-way valve 60 flow in this order. Since the refrigerant passes through the strainer 72 in front of the indoor heat exchanger 50, sludge is captured by the strainer 72. Therefore, during the cooling operation, the strainer 72 suppresses the intrusion of sludge into the indoor heat exchanger 50. This sludge is generated in the pipe 80, and contains abrasion powder of the compressor 20, deteriorated product of refrigerating machine oil, and the like.

When the refrigeration cycle device 10 is operated for cooling, the length of the refrigerant pipe 83 in front of the indoor heat exchanger 50 is shortened, and the distance between the strainer 72 and the indoor heat exchanger 50 is shortened to reduce the indoor heat. It is possible to reduce the possibility that sludge generated in the refrigerant pipe 83 will enter the exchanger 50.

As shown in FIG. 2, in the refrigerating cycle device 10, during the heating operation, the refrigerants are the compressor 20, the four-way valve 60, the refrigerant pipe 81, the strainer 71, the refrigerant pipe 82, the indoor heat exchanger 50, the refrigerant pipe 83, and the like. The flow flows in the order of the strainer 72, the refrigerant pipe 84, the expansion valve 40, the outdoor heat exchanger 30, and the four-way valve 60. Since the refrigerant passes through the strainer 71 in front of the indoor heat exchanger 50, sludge is captured by the strainer 71. Therefore, during the heating operation, the strainer 71 suppresses the intrusion of sludge into the indoor heat exchanger 50.

When the refrigeration cycle device 10 is heated, the length of the refrigerant pipe 82 in front of the indoor heat exchanger 50 is shortened, and the distance between the strainer 71 and the indoor heat exchanger 50 is shortened to reduce the indoor heat. It is possible to reduce the possibility that sludge generated in the refrigerant pipe 82 will enter the exchanger 50.

1 and 2 show a configuration in which strainers are connected to the refrigerant circuit RC before and after the indoor heat exchanger 50 as an example of the refrigeration cycle device 10 according to the present embodiment. However, the configuration of the refrigeration cycle device 10 according to the present embodiment is not limited to this, and a strainer may be connected to the refrigerant circuit RC before and after the outdoor heat exchanger 30.

With reference to FIGS. 3 and 4, in the refrigeration cycle device 10 of the first modification according to the present embodiment, strainers are connected to the refrigerant circuit RC before and after the outdoor heat exchanger 30. FIG. 3 shows the flow of the refrigerant during the cooling operation of the refrigeration cycle device 10 of the modification 1 according to the present embodiment. FIG. 4 shows the flow of the refrigerant during the heating operation of the refrigeration cycle device 10 of the first modification according to the present embodiment. In FIGS. 3 and 4, the flow of the refrigerant is indicated by the broken line arrow.

As shown in FIGS. 3 and 4, the refrigeration cycle device 10 of the first modification according to the present embodiment has a strainer 73 and a strainer 74 connected to the refrigerant circuit RC. Each of the strainer 73 and the strainer 74 may have the same structure as the strainer 71 and the strainer 72 described above.

In the first modification according to the present embodiment, the strainer 73 is arranged between the pipe 80 connecting the compressor 20 and the outdoor heat exchanger 30, and connects the outdoor heat exchanger 30 and the expansion valve 40. A strainer 74 is arranged between the pipes 80. More specifically, the strainer 73 is arranged between the four-way valve 60 and the pipe 80 connecting the outdoor heat exchanger 30. In the first modification according to the present embodiment, the strainer 73 and the strainer 74 are connected to the refrigerant circuit RC before and after the outdoor heat exchanger 30.

As shown in FIG. 3, during the cooling operation, the strainer 73 corresponds to the strainer and the first strainer described in the claims. During the cooling operation, the strainer 73 corresponding to the first strainer functions as a strainer. The strainer 73 is connected to a pipe 80 that connects the compressor 20 and the outdoor heat exchanger 30 that is a condenser. The length of the pipe 80 connecting the strainer 73 and the outdoor heat exchanger 30 which is a condenser is shorter than the length of the pipe 80 connecting the compressor 20 and the strainer 73. Further, the length of the pipe 80 connecting the strainer 73 and the outdoor heat exchanger 30 which is a condenser is shorter than the length of the pipe 80 connecting the four-way valve 60 and the strainer 73.

Further, during the cooling operation, the strainer 74 corresponds to the second strainer described in the claims. The strainer 74 is connected to a pipe 80 that connects the outdoor heat exchanger 30 which is a condenser and the expansion valve 40. The length of the pipe 80 connecting the strainer 74 and the outdoor heat exchanger 30 which is a condenser is shorter than the length of the pipe connecting the expansion valve 40 and the strainer 74.

As shown in FIG. 4, during the heating operation, the strainer 74 corresponds to the strainer and the second strainer described in the claims. During the heating operation, the strainer 74 corresponding to the second strainer functions as a strainer. The strainer 74 is connected to a pipe 80 that connects the expansion valve 40 and the outdoor heat exchanger 30 that is an evaporator. The length of the pipe 80 connecting the strainer 74 and the outdoor heat exchanger 30 which is an evaporator is shorter than the length of the pipe 80 connecting the expansion valve 40 and the strainer 74.

Further, during the heating operation, the strainer 73 corresponds to the first strainer described in the claims. The strainer 73 is connected to a pipe 80 that connects the outdoor heat exchanger 30 which is an evaporator and the compressor 20. The length of the pipe 80 connecting the strainer 73 and the outdoor heat exchanger 30 which is an evaporator is shorter than the length of the pipe 80 connecting the compressor 20 and the strainer 73. Further, the length of the pipe 80 connecting the strainer 73 and the outdoor heat exchanger 30 which is an evaporator is shorter than the length of the pipe 80 connecting the four-way valve 60 and the strainer 73.

As shown in FIG. 3, in the refrigeration cycle device 10, during the cooling operation, the refrigerant is the compressor 20, the four-way valve 60, the strainer 73, the outdoor heat exchanger 30, the strainer 74, the expansion valve 40, and the indoor heat exchanger 50. , Four-way valve 60 flows in this order. Since the refrigerant passes through the strainer 73 in front of the outdoor heat exchanger 30, sludge is captured by the strainer 73. Therefore, during the cooling operation, the strainer 73 suppresses the intrusion of sludge into the outdoor heat exchanger 30.

When the refrigeration cycle device 10 is cooled, the length of the pipe 80 connecting the strainer 73 and the outdoor heat exchanger 30 is shortened so that the strainer 73 and the outdoor heat exchanger 30 are connected to the indoor heat exchanger 50. It is possible to reduce the possibility of sludge generated in the connecting pipe 80 invading.

As shown in FIG. 4, in the refrigeration cycle apparatus 10, during the heating operation, the refrigerants are the compressor 20, the four-way valve 60, the indoor heat exchanger 50, the expansion valve 40, the strainer 74, the outdoor heat exchanger 30, and the strainer 73. , Four-way valve 60 flows in this order. Since the refrigerant passes through the strainer 74 in front of the outdoor heat exchanger 30, sludge is captured by the strainer 74. Therefore, during the heating operation, the strainer 74 suppresses the intrusion of sludge into the outdoor heat exchanger 30.

When the refrigeration cycle device 10 is heated, the length of the pipe 80 connecting the strainer 74 and the outdoor heat exchanger 30 is shortened so that the strainer 74 and the outdoor heat exchanger 30 are connected to the outdoor heat exchanger 30. It is possible to reduce the possibility of sludge generated in the connecting pipe 80 invading.

Further, the configuration of the refrigeration cycle device 10 according to the present embodiment may be such that strainers are connected to the refrigerant circuit RC before and after both the outdoor heat exchanger 30 and the indoor heat exchanger 50.

With reference to FIGS. 5 and 6, in the refrigeration cycle device 10 of the second modification according to the present embodiment, the outdoor heat exchanger 30 and the strainers are arranged in front of and behind the room in the refrigerant circuit RC. FIG. 5 shows the flow of the refrigerant during the cooling operation of the refrigeration cycle device 10 of the second modification according to the present embodiment. FIG. 6 shows the flow of the refrigerant during the heating operation of the refrigeration cycle device 10 of the second modification according to the present embodiment. In FIGS. 5 and 6, the flow of the refrigerant is indicated by the broken line arrow.

As shown in FIGS. 5 and 6, the refrigerating cycle apparatus 10 of the second modification according to the present embodiment has a strainer 71, a strainer 72, a strainer 73, and a strainer 74.

As shown in FIG. 5, during the cooling operation, the strainer 72 and the strainer 73 correspond to the strainer and the first strainer described in the claims. Further, the strainer 71 and the strainer 74 correspond to the second strainer described in the claims.

As shown in FIG. 6, during the heating operation, the strainer 71 and the strainer 74 correspond to the strainer and the first strainer described in the claims. Further, the strainer 72 and the strainer 73 correspond to the second strainer described in the claims.

Further, in FIGS. 1 to 6, at least one of the indoor heat exchanger 50 and the outdoor heat exchanger 30 in the refrigerant circuit RC as an example of the refrigerating cycle device 10 according to the present embodiment and the modified example according to the present embodiment. The configuration in which the strainer is connected before and after the is shown. However, the configuration of the refrigeration cycle device 10 according to the present embodiment is not limited to these, and the strainer is connected only in front of the indoor heat exchanger 50 or the outdoor heat exchanger 30 to the refrigerant circuit RC. You may.

With reference to FIG. 7, in the refrigeration cycle device 10 of the third modification according to the present embodiment, the strainer is connected to the refrigerant circuit RC only in front of the indoor heat exchanger 50. FIG. 7 shows the flow of the refrigerant during the cooling operation of the refrigeration cycle device 10 of the modification 3 according to the present embodiment. In FIG. 7, the flow of the refrigerant is indicated by the broken line arrow.

As shown in FIG. 7, the refrigeration cycle device 10 of the second modification according to the present embodiment does not have the above-mentioned four-way valve 60. During the cooling operation, the refrigerant circulates in the refrigerant circuit RC in the order of the compressor 20, the outdoor heat exchanger 30, the expansion valve 40, the strainer 70, and the indoor heat exchanger 50. During the cooling operation, the outdoor heat exchanger 30 functions as a condenser, and the indoor heat exchanger 50 functions as an evaporator.

The strainer 70 corresponds to the strainer described in the claims. The strainer 70 is connected to a pipe 80 that connects the expansion valve 40 and the indoor heat exchanger 50 that is an evaporator. The length of the pipe 80 connecting the strainer 70 and the indoor heat exchanger 50 which is an evaporator is shorter than the length of the pipe 80 connecting the expansion valve 40 and the strainer 70.

With reference to FIG. 8, in the refrigeration cycle apparatus of the fourth modification according to the present embodiment, the strainer is connected to the refrigerant circuit RC only in front of the outdoor heat exchanger 30. FIG. 8 shows the flow of the refrigerant during the cooling operation of the refrigeration cycle device 10 of the modification 4 according to the present embodiment. In FIG. 8, the flow of the refrigerant is indicated by the broken line arrow.

As shown in FIG. 8, the refrigeration cycle device 10 of the modified example 4 according to the present embodiment does not have the above-mentioned four-way valve 60. During the cooling operation, the refrigerant circulates in the refrigerant circuit RC in the order of the compressor 20, the strainer 70, the outdoor heat exchanger 30, the expansion valve 40, and the indoor heat exchanger 50. During the cooling operation, the outdoor heat exchanger 30 functions as a condenser, and the indoor heat exchanger 50 functions as an evaporator.

The strainer 70 corresponds to the strainer described in the claims. The strainer 70 is connected to a pipe 80 that connects the compressor 20 and the outdoor heat exchanger 30 that is a condenser. The length of the pipe 80 connecting the strainer 70 and the outdoor heat exchanger 30 which is a condenser is shorter than the length of the pipe 80 connecting the compressor 20 and the strainer 73.

Next, the action and effect of the present embodiment will be described.
In the refrigeration cycle apparatus 10 according to the present embodiment, when the strainer is connected to the pipe 80 connecting the compressor 20 and the condenser, the length of the pipe 80 connecting the strainer and the condenser is set. It is shorter than the length of the pipe 80 connecting the compressor 20 and the strainer. When the strainer is connected to the pipe 80 connecting the expansion valve 40 and the evaporator, the length of the pipe 80 connecting the strainer and the evaporator is the length of the pipe 80 connecting the expansion valve 40 and the trainer. Shorter than the length. Therefore, by shortening the length of the pipe 80 connecting the strainer and the condenser, it is possible to suppress the generation of sludge in the pipe 80. Further, by shortening the length of the pipe 80 connecting the strainer and the evaporator, it is possible to suppress the generation of sludge in the pipe 80. Therefore, it is possible to suppress deterioration of the heat transfer performance of the heat exchanger (condenser or evaporator) due to the sludge flowing into the heat exchanger (condenser or evaporator).

Further, in the refrigeration cycle device 10 according to the present embodiment, the four-way valve 60 and the first strainer and the second strainer connected to the refrigerant circuit RC at least at least one of the outdoor heat exchanger 30 and the indoor heat exchanger 50 are front and rear. Equipped with a strainer. During the cooling operation, the first strainer functions as a strainer, and during the heating operation, the second strainer functions as a strainer. Therefore, the heat exchanger (condenser or evaporator) due to sludge flowing into at least one of the outdoor heat exchanger 30 and the indoor heat exchanger 50 in both the cooling operation and the heating operation by the first strainer and the second strainer. ) Can suppress the deterioration of heat transfer performance.

Further, according to the refrigeration cycle device 10 according to the present embodiment, the indoor unit 102 houses the first strainer and the second strainer. Therefore, the length of each of the pipes 80 connecting the indoor heat exchanger 50 housed in the indoor unit 102 and the first strainer and the second strainer can be shortened. As a result, the generation of sludge in the pipe 80 can be suppressed. Therefore, it is possible to suppress the deterioration of the heat transfer performance of the indoor heat exchanger 50 due to the sludge flowing into the indoor heat exchanger 50.

Embodiment 2.
The refrigeration cycle apparatus 10 according to the second embodiment of the present invention will be described with reference to FIGS. 9 and 10. FIG. 9 shows the flow of the refrigerant during the cooling operation of the refrigeration cycle device 10 according to the second embodiment of the present invention. FIG. 10 shows the flow of the refrigerant during the heating operation of the refrigeration cycle device 10 according to the second embodiment of the present invention. In FIGS. 9 and 10, the flow of the refrigerant is indicated by the broken line arrow.

As shown in FIGS. 9 and 10, the refrigeration cycle device 10 according to the present embodiment includes a strainer 71, a strainer 72, a bypass pipe 90, and a two-way valve 100. In the present embodiment, the strainer 71 and the strainer 72 are connected to the refrigerant circuit RC before and after the indoor heat exchanger 50. The refrigerant circuit RC has a bypass pipe 90 and a two-way valve 100.

As shown in FIG. 9, during the cooling operation, the strainer 72 corresponds to the strainer and the first strainer described in the claims, and the strainer 71 corresponds to the second strainer. The bypass pipe 90 is connected to a pipe 80 that connects the indoor heat exchanger 50 and the strainer 71, and a pipe 80 that connects the four-way valve 60 and the strainer 71. The bypass pipe 90 is configured to bypass the strainer 71. In the present embodiment, the bypass pipe 90 is connected to the refrigerant pipe 81 and the refrigerant pipe 82.

The two-way valve 100 is connected to a pipe 80 and a bypass pipe 90 that connect the indoor heat exchanger 50 and the strainer 71. The two-way valve 100 is arranged at a branch portion between the refrigerant pipe 82 and the bypass pipe 90. The refrigeration cycle device 10 is configured so that the refrigerant flow path can be changed to either the path to the strainer 71 or the path to the bypass pipe 90 by switching the valve of the two-way valve 100.

As shown in FIG. 9, the two-way valve 100 is configured to allow the refrigerant to flow from the indoor heat exchanger 50 to the bypass pipe 90 during the cooling operation. Further, as shown in FIG. 10, the two-way valve 100 is configured to allow the refrigerant to flow from the strainer 71 to the indoor heat exchanger 50 during the heating operation.

As shown in FIG. 9, when the refrigerating cycle device 10 performs the cooling operation, the two-way valve 100 is set so that the refrigerant flows through the path to the bypass pipe 90 and does not flow through the path to the strainer 71. That is, during the cooling operation, the refrigerant is the compressor 20, the four-way valve 60, the outdoor heat exchanger 30, the expansion valve 40, the refrigerant pipe 84, the strainer 72, the refrigerant pipe 83, the indoor heat exchanger 50, the refrigerant pipe 82, and the two sides. The flow flows in the order of valve 100, bypass pipe 90, refrigerant pipe 81, and four-way valve 60.

When the refrigerating cycle device 10 performs the cooling operation, when the refrigerant flowing out of the indoor heat exchanger 50 passes through the strainer 71, the pressure loss of the refrigerant increases and the pressure of the refrigerant sucked into the compressor 20 may decrease. There is sex. When the pressure of the refrigerant sucked into the compressor 20 decreases, the input of the compressor 20 increases, so that the power consumption of the refrigeration cycle device 10 increases.

Therefore, when the refrigerating cycle device 10 performs the cooling operation as in the present embodiment, the refrigerating cycle device 10 is set by setting the two-way valve 100 so that the refrigerant does not pass through the bypass pipe 90 and the strainer 71. It is possible to suppress an increase in power consumption.

Further, as shown in FIG. 10, when the refrigerating cycle device 10 performs the heating operation, the two-way valve 100 is set so that the refrigerant flows through the path to the strainer 71 and does not flow through the path to the bypass pipe 90. To. That is, during the heating operation, the refrigerants are the compressor 20, the four-way valve 60, the refrigerant pipe 81, the strainer 71, the refrigerant pipe 82, the two-way valve 100, the refrigerant pipe 82, the indoor heat exchanger 50, the refrigerant pipe 83, and the strainer 72. The refrigerant pipe 84, the expansion valve 40, the outdoor heat exchanger 30, and the four-way valve 60 flow in this order.

When the refrigerating cycle device 10 performs the heating operation, sludge is trapped in the strainer 71 because it passes through the strainer 71 before the refrigerant flows into the indoor heat exchanger 50. This makes it possible to suppress the intrusion of sludge into the indoor heat exchanger 50.

In FIGS. 9 and 10, as an example of the refrigeration cycle device 10 according to the second embodiment of the present invention, the bypass pipe 90 and the bypass pipe 90 have a configuration in which strainers are connected to the refrigerant circuit RC before and after the indoor heat exchanger 50. The configuration in which the two-way valve 100 is arranged is shown. However, the configuration of the refrigeration cycle device 10 according to the present embodiment is not limited to this, and is a configuration in which strainers are connected to the refrigerant circuit RC before and after the outdoor heat exchanger 30, and the bypass pipe 90 and the two sides. The configuration may be such that the valve 100 is arranged.

With reference to FIGS. 11 and 12, in the refrigeration cycle device 10 of the first modification according to the present embodiment, strainers are connected to the refrigerant circuit RC before and after the outdoor heat exchanger 30. FIG. 11 shows the flow of the refrigerant during the cooling operation of the refrigeration cycle device 10 of the first modification according to the present embodiment. FIG. 12 shows the flow of the refrigerant during the heating operation of the refrigeration cycle device 10 of the first modification according to the present embodiment. In FIGS. 11 and 12, the flow of the refrigerant is indicated by the broken line arrow.

As shown in FIGS. 11 and 12, the refrigeration cycle device 10 of the first modification according to the present embodiment includes a strainer 73, a strainer 74, a bypass pipe 90, and a two-way valve 100. The strainer 73 and the strainer 74 are arranged before and after the outdoor heat exchanger 30 in the refrigerant circuit RC. In the present embodiment, the strainer 73 and the strainer 74 are connected to the refrigerant circuit RC before and after the outdoor heat exchanger 30.

As shown in FIG. 11, during the cooling operation, the strainer 73 corresponds to the strainer and the first strainer described in the claims, and the strainer 74 corresponds to the second strainer. The bypass pipe 90 is connected to a pipe 80 that connects the outdoor heat exchanger 30 and the strainer 73, and a pipe 80 that connects the four-way valve 60 and the strainer 73. The bypass pipe 90 is configured to bypass the strainer 73.

The two-way valve 100 is connected to a pipe 80 connecting the outdoor heat exchanger 30 and the strainer 73 and a bypass pipe 90. The two-way valve 100 is arranged at a branch portion between the path to the strainer 73 and the path to the bypass pipe 90 in the refrigerant flow path. The refrigeration cycle device 10 is configured so that the refrigerant flow path can be changed to either the path to the strainer 73 or the path to the bypass pipe 90 by switching the valve of the two-way valve 100.

As shown in FIG. 11, the two-way valve 100 is configured to allow the refrigerant to flow from the strainer 73 to the outdoor heat exchanger 30 during the cooling operation. Further, as shown in FIG. 12, the two-way valve 100 is configured to allow the refrigerant to flow from the outdoor heat exchanger 30 to the bypass pipe 90 during the heating operation.

As shown in FIG. 11, when the refrigeration cycle device 10 performs the cooling operation, the two-way valve 100 is set so that the refrigerant flows through the path to the strainer 73 and does not flow through the path to the bypass pipe 90. That is, during the cooling operation, the refrigerant flows in the order of the compressor 20, the four-way valve 60, the strainer 73, the two-way valve 100, the outdoor heat exchanger 30, the strainer 74, the expansion valve 40, the indoor heat exchanger 50, and the four-way valve 60. ..

When the refrigerating cycle device 10 performs the cooling operation, sludge is trapped in the strainer 73 because it passes through the strainer 73 before the refrigerant flows into the outdoor heat exchanger 30. This makes it possible to suppress the intrusion of sludge into the outdoor heat exchanger 30.

Further, as shown in FIG. 12, when the refrigerating cycle device 10 performs the heating operation, the two-way valve 100 is set so that the refrigerant flows through the path to the bypass pipe 90 and does not flow through the path to the strainer 73. To. That is, during the heating operation, the refrigerant is in the order of the compressor 20, the four-way valve 60, the indoor heat exchanger 50, the expansion valve 40, the strainer 74, the outdoor heat exchanger 30, the two-way valve 100, the bypass pipe 90, and the four-way valve 60. It flows.

When the refrigeration cycle device 10 performs a heating operation, when the refrigerant flowing out of the outdoor heat exchanger 30 passes through the strainer 73, the pressure loss of the refrigerant increases and the pressure of the refrigerant sucked into the compressor 20 may decrease. There is sex. When the pressure of the refrigerant sucked into the compressor 20 decreases, the input of the compressor 20 increases, so that the power consumption of the refrigeration cycle device 10 increases.

Therefore, when the refrigerating cycle device 10 performs the heating operation as in the first modification according to the present embodiment, the two-way valve 100 is set so that the refrigerant does not pass through the bypass pipe 90 and the strainer 73. , It is possible to suppress an increase in the power consumption of the refrigeration cycle device 10.

Next, the action and effect of the present embodiment will be described.
In the refrigeration cycle device 10 according to the present embodiment, as shown in FIG. 9, the bypass pipe 90 has a pipe 80 connecting the indoor heat exchanger 50 and the second strainer, and a four-way valve 60 and the second strainer. It is connected to the pipe 80 to be connected. The two-way valve 100 is configured to allow the refrigerant to flow from the indoor heat exchanger 50 to the bypass pipe 90 during the cooling operation. Therefore, the refrigerant can flow to the bypass pipe 90 by the two-way valve 100. Then, during the cooling operation, the refrigerant passes through the bypass pipe 90, so that the pressure loss of the refrigerant due to the refrigerant passing through the second strainer can be avoided. Therefore, it is possible to avoid a decrease in the pressure of the refrigerant absorbed by the compressor 20 due to an increase in the pressure loss of the refrigerant. Therefore, since it is possible to avoid an increase in the input of the compressor 20 due to a decrease in the pressure of the refrigerant, it is possible to avoid an increase in the power consumption of the refrigeration cycle device 10.

Further, in the refrigeration cycle device 10 according to the present embodiment, as shown in FIG. 12, the bypass pipe 90 includes the pipe 80 connecting the outdoor heat exchanger 30 and the first strainer, the four-way valve 60, and the first strainer. It is connected to a pipe 80 that connects to a strainer. The two-way valve 100 is configured to allow the refrigerant to flow from the outdoor heat exchanger 30 to the bypass pipe 90 during the heating operation. Therefore, the refrigerant can flow to the bypass pipe 90 by the two-way valve 100. Then, during the heating operation, the refrigerant passes through the bypass pipe 90, so that the pressure loss of the refrigerant due to the refrigerant passing through the first strainer can be avoided. Therefore, it is possible to avoid a decrease in the pressure of the refrigerant absorbed by the compressor 20 due to an increase in the pressure loss of the refrigerant. Therefore, since it is possible to avoid an increase in the input of the compressor 20 due to a decrease in the pressure of the refrigerant, it is possible to avoid an increase in the power consumption of the refrigeration cycle device 10.

The bypass pipe 90 is more effective with a refrigerant having a large pressure loss. Therefore, the refrigerant in the present embodiment may be a low GWP (Global Warming Potential) refrigerant having a larger pressure loss than R32. Specifically, the refrigerant may be a mixed refrigerant containing R290 or R290. Further, the refrigerant may be a mixed refrigerant containing R1234yf or R1234ze.

Embodiment 3.
The refrigeration cycle apparatus 10 according to the third embodiment of the present invention will be described with reference to FIGS. 13 and 14. FIG. 13 shows the flow of the refrigerant during the cooling operation of the refrigeration cycle device 10 according to the third embodiment of the present invention. FIG. 14 shows the flow of the refrigerant during the heating operation of the refrigeration cycle device 10 according to the second embodiment of the present invention. In FIGS. 13 and 14, the flow of the refrigerant is indicated by the dashed arrow.

As shown in FIGS. 13 and 14, the refrigerating cycle apparatus 10 according to the present embodiment includes a strainer 71, a strainer 72, a bypass pipe 90, a first check valve 111, and a second check valve 112. And have. In the present embodiment, the strainer 71 and the strainer 72 are connected to the refrigerant circuit RC before and after the indoor heat exchanger 50. The refrigerant circuit RC includes a bypass pipe 90, a first check valve 111, and a second check valve 112.

As shown in FIG. 13, during the cooling operation, the strainer 72 corresponds to the strainer and the first strainer described in the claims, and the strainer 71 corresponds to the second strainer. The first check valve 111 is connected to the pipe 80 connecting the indoor heat exchanger 50 and the strainer 71 between the strainer 71 and the bypass pipe 90. Specifically, the first check valve 111 is arranged between the branch portion between the refrigerant pipe 82 and the bypass pipe 90 and the strainer 71. The second check valve 112 is connected to the bypass pipe 90. Each of the first check valve 111 and the second check valve 112 allows the refrigerant to flow in only one direction, and can block the flow of the refrigerant flowing from the opposite direction.

As shown in FIG. 13, the first check valve 111 is configured to allow the refrigerant to flow from the strainer 71 to the indoor heat exchanger 50 and prevent the refrigerant from flowing from the indoor heat exchanger 50 to the strainer 71. There is. The first check valve 111 is arranged so as to allow the refrigerant to flow from the four-way valve 60 toward the indoor heat exchanger 50 and to block the flow of the refrigerant from the indoor heat exchanger 50 toward the four-way valve 60.

As shown in FIG. 14, the second check valve 112 is configured to prevent the refrigerant from flowing from the four-way valve 60 to the indoor heat exchanger 50, from the indoor heat exchanger 50 to the four-way valve 60. It is configured to allow the refrigerant to flow. The second check valve 112 is arranged so as to allow the refrigerant to flow from the indoor heat exchanger 50 toward the four-way valve 60 and to block the flow of the refrigerant from the four-way valve 60 toward the indoor heat exchanger 50.

As shown in FIG. 13, when the refrigerating cycle device 10 performs the cooling operation, the refrigerants are the compressor 20, the four-way valve 60, the outdoor heat exchanger 30, the expansion valve 40, the refrigerant pipe 84, the strainer 72, and the refrigerant pipe 83. , Indoor heat exchanger 50, refrigerant pipe 82, bypass pipe 90, second check valve 112, bypass pipe 90, refrigerant pipe 81, and four-way valve 60 in this order.

When the refrigerating cycle device 10 performs the cooling operation, the refrigerant flows into the indoor heat exchanger 50 after passing through the strainer 72, so that sludge is captured by the strainer 72. This makes it possible to suppress the intrusion of sludge into the indoor heat exchanger 50. Further, it is possible to prevent the refrigerant flow path of the indoor heat exchanger 50 from being blocked by sludge. Further, since the refrigerant that has passed through the indoor heat exchanger 50 flows through the bypass pipe 90, it is possible to suppress a decrease in the pressure of the refrigerant sucked into the compressor 20.

As shown in FIG. 14, when the refrigerating cycle device 10 performs the heating operation, the refrigerants are the compressor 20, the four-way valve 60, the refrigerant pipe 81, the strainer 71, the first check valve 111, the refrigerant pipe 82, and the room heat. The flow flows in the order of the exchanger 50, the refrigerant pipe 83, the strainer 72, the refrigerant pipe 84, the expansion valve 40, the outdoor heat exchanger 30, and the four-way valve 60.

When the refrigeration cycle device 10 performs the heating operation, the refrigerant flows into the indoor heat exchanger 50 after passing through the strainer 71, so that sludge is captured by the strainer 71. This makes it possible to suppress the intrusion of sludge into the indoor heat exchanger 50. Further, it is possible to prevent the refrigerant flow path of the indoor heat exchanger 50 from being blocked by sludge.

In FIGS. 13 and 14, as an example of the refrigeration cycle device 10 according to the third embodiment of the present invention, the bypass pipe 90 and the bypass pipe 90 have a configuration in which strainers are connected to the refrigerant circuit RC before and after the indoor heat exchanger 50. A configuration is shown in which the first check valve 111 and the second check valve 112 are arranged. However, the configuration of the refrigeration cycle device 10 according to the present embodiment is not limited to this, and is a configuration in which strainers are connected to the refrigerant circuit RC before and after the outdoor heat exchanger 30, the bypass pipe 90 and the first. The check valve 111 and the second check valve 112 may be arranged.

With reference to FIGS. 15 and 16, in the refrigeration cycle device 10 of the first modification according to the present embodiment, strainers are arranged before and after the outdoor heat exchanger 30 in the refrigerant circuit RC. FIG. 15 shows the flow of the refrigerant during the cooling operation of the refrigeration cycle device 10 of the first modification according to the present embodiment. FIG. 16 shows the flow of the refrigerant during the heating operation of the refrigeration cycle device 10 of the first modification according to the present embodiment. In FIGS. 15 and 16, the flow of the refrigerant is indicated by the dashed arrow.

As shown in FIGS. 15 and 16, the refrigerating cycle apparatus 10 according to the present embodiment includes a strainer 73, a strainer 74, a bypass pipe 90, a first check valve 111, and a second check valve 112. And have. In the present embodiment, the strainer 73 and the strainer 74 are connected to the refrigerant circuit RC before and after the outdoor heat exchanger 30.

As shown in FIG. 15, during the cooling operation, the strainer 73 corresponds to the strainer and the first strainer described in the claims, and the strainer 74 corresponds to the second strainer. The first check valve 111 is connected to the pipe 80 connecting the outdoor heat exchanger 30 and the strainer 73 between the strainer 73 and the bypass pipe 90. Specifically, the first check valve 111 is arranged between the strainer 73 and the branch portion between the pipe connecting the strainer 73 and the outdoor heat exchanger 30 and the bypass pipe 90. The second check valve 112 is connected to the bypass pipe 90.

As shown in FIG. 15, the first check valve 111 is configured to allow the refrigerant to flow from the strainer 73 to the outdoor heat exchanger 30 and prevent the refrigerant from flowing from the outdoor heat exchanger 30 to the strainer 73. There is. The first check valve 111 is arranged so as to allow the refrigerant to flow from the four-way valve 60 toward the outdoor heat exchanger 30 and to block the flow of the refrigerant from the outdoor heat exchanger 30 toward the four-way valve 60.

As shown in FIG. 16, the second check valve 112 is configured to prevent the refrigerant from flowing from the four-way valve 60 to the outdoor heat exchanger 30, and from the outdoor heat exchanger 30 to the four-way valve 60. It is configured to allow the refrigerant to flow. The second check valve 112 is arranged so as to allow the refrigerant to flow from the outdoor heat exchanger 30 toward the four-way valve 60 and to block the flow of the refrigerant from the four-way valve 60 toward the outdoor heat exchanger 30.

As shown in FIG. 15, when the refrigeration cycle device 10 performs the cooling operation, the refrigerants are the compressor 20, the four-way valve 60, the strainer 73, the first check valve 111, the outdoor heat exchanger 30, the strainer 74, and the expansion. The flow flows in the order of the valve 40, the indoor heat exchanger 50, and the four-way valve 60.

When the refrigerating cycle device 10 performs the cooling operation, the refrigerant flows into the outdoor heat exchanger 30 after passing through the strainer 73, so that the sludge is captured by the strainer 73. This makes it possible to suppress the intrusion of sludge into the outdoor heat exchanger 30. Further, it is possible to prevent the refrigerant flow path of the outdoor heat exchanger 30 from being blocked by sludge.

As shown in FIG. 16, when the refrigerating cycle device 10 performs the heating operation, the refrigerants are the compressor 20, the four-way valve 60, the indoor heat exchanger 50, the expansion valve 40, the strainer 74, the outdoor heat exchanger 30, and the bypass. The flow flows in the order of the pipe 90, the second check valve 112, the bypass pipe 90, and the four-way valve 60.

When the refrigerating cycle device 10 performs the heating operation, the refrigerant flows into the outdoor heat exchanger 30 after passing through the strainer 74, so that sludge is captured by the strainer 74. This makes it possible to suppress the intrusion of sludge into the outdoor heat exchanger 30. Further, it is possible to prevent the refrigerant flow path of the outdoor heat exchanger 30 from being blocked by sludge. Further, since the refrigerant that has passed through the outdoor heat exchanger 30 flows through the bypass pipe 90, it is possible to suppress a decrease in the pressure of the refrigerant sucked into the compressor 20.

Next, the action and effect of the present embodiment will be described.
In the refrigeration cycle device 10 according to the present embodiment, as shown in FIG. 15, the bypass pipe 90 includes the pipe 80 connecting the indoor heat exchanger 50 and the second strainer, the four-way valve 60, and the second strainer. It is connected to the pipe 80 that connects the above. The first check valve 111 is configured to allow the refrigerant to flow from the second strainer to the indoor heat exchanger 50 and prevent the refrigerant from flowing from the indoor heat exchanger 50 to the second strainer. The second check valve 112 is configured to prevent the refrigerant from flowing from the four-way valve 60 to the indoor heat exchanger 50, and is configured to allow the refrigerant to flow from the indoor heat exchanger 50 to the four-way valve 60. There is. The first check valve 111 and the second check valve 112 allow the refrigerant to flow into the bypass pipe 90. Therefore, during the cooling operation, the refrigerant passes through the bypass pipe 90, so that the pressure loss of the refrigerant due to the refrigerant passing through the second strainer can be avoided. Therefore, it is possible to avoid a decrease in the pressure of the refrigerant absorbed by the compressor 20 due to an increase in the pressure loss of the refrigerant. Therefore, since it is possible to avoid an increase in the input of the compressor 20 due to a decrease in the pressure of the refrigerant, it is possible to avoid an increase in the power consumption of the refrigeration cycle device 10.

In the refrigeration cycle device 10 according to the present embodiment, as shown in FIG. 16, the bypass pipe 90 includes the pipe 80 connecting the outdoor heat exchanger 30 and the first strainer, the four-way valve 60, and the first strainer. It is connected to the pipe 80 that connects the above. The first check valve 111 is configured to allow the refrigerant to flow from the first strainer to the outdoor heat exchanger 30 and prevent the refrigerant from flowing from the outdoor heat exchanger 30 to the first strainer. The second check valve 112 is configured to prevent the refrigerant from flowing from the four-way valve 60 to the outdoor heat exchanger 30, and is configured to allow the refrigerant to flow from the outdoor heat exchanger 30 to the four-way valve. .. The first check valve 111 and the second check valve 112 allow the refrigerant to flow into the bypass pipe 90. Then, during the cooling operation, the refrigerant passes through the bypass pipe 90, so that the pressure loss of the refrigerant due to the refrigerant passing through the first strainer can be avoided. Therefore, it is possible to avoid a decrease in the pressure of the refrigerant absorbed by the compressor 20 due to an increase in the pressure loss of the refrigerant. Therefore, since it is possible to avoid an increase in the input of the compressor 20 due to a decrease in the pressure of the refrigerant, it is possible to avoid an increase in the power consumption of the refrigeration cycle device 10.

Embodiment 4.
The refrigeration cycle apparatus 10 according to the fourth embodiment of the present invention will be described with reference to FIG. FIG. 17 is a configuration diagram schematically showing a configuration of a heat transfer tube of the heat exchanger of the refrigeration cycle apparatus 10 according to the fourth embodiment of the present invention.

As shown in FIG. 17, at least one of the outdoor heat exchanger 30 and the indoor heat exchanger 50 has a heat transfer tube. The heat transfer tube is composed of a flat multi-hole tube 120. At least one of the outdoor heat exchanger 30 and the indoor heat exchanger 50 has a plurality of flat multi-hole pipes 120 and a header tank 130. A plurality of flat multi-hole tubes 120 are laminated. Each of the plurality of flat multi-hole pipes 120 has a plurality of refrigerant flow paths 122. The plurality of flat multi-hole tubes 120 are inserted into the header tank 130.

As shown by the arrow in FIG. 17, when the refrigerant flows from the header tank 130 into the flat multi-hole pipe 120, the refrigerant collides with the inner wall 121 on the inflow port tip side of the flat multi-hole pipe 120. When the refrigerant collides with the inner wall 121 of the flat multi-hole pipe 120, sludge mixed in the refrigerant adheres to the inner wall 121 of the flat multi-hole pipe 120. Therefore, when the operation of the refrigeration cycle device 10 is continued, sludge gradually accumulates on the inner wall 121 of the flat multi-hole pipe 120. Then, the accumulated sludge may block the refrigerant flow path 122 of the flat multi-hole pipe 120.

According to the present embodiment, at least one of the heat transfer tubes of the outdoor heat exchanger 30 and the indoor heat exchanger 50 is composed of a flat multi-hole tube 120. Therefore, by connecting a strainer in front of or in front of or behind the heat exchanger having the flat multi-hole pipe 120 in the refrigerant circuit RC, it is possible to prevent the refrigerant flow path 122 of the flat multi-hole pipe 120 from being blocked by sludge. Can be done.

Each of the above embodiments can be combined as appropriate.
It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the claims rather than the above description, and it is intended to include all modifications within the meaning and scope of the claims.

10 Refrigeration cycle equipment, 20 compressor, 30 outdoor heat exchanger, 40 expansion valve, 50 indoor heat exchanger, 60 four-way valve, 70, 71, 72, 73, 74 strainer, 80 piping, 90 bypass piping, 100 two-way Valve, 101 outdoor unit, 102 indoor unit, 111 first check valve, 112 second check valve, 120 flat multi-hole pipe, RC refrigerant circuit.

Claims (8)

A refrigerant circuit connected by piping so that the refrigerant flows in the order of compressor, condenser, expansion valve, and evaporator,
A strainer that is connected to the refrigerant circuit and captures foreign matter mixed in the refrigerant is provided.
The strainer is connected to at least one of the pipe connecting the compressor and the condenser and the pipe connecting the expansion valve and the evaporator.
When the strainer is connected to the pipe connecting the compressor and the condenser, the length of the pipe connecting the strainer and the condenser is the length of the pipe connecting the compressor and the strainer. Shorter than the length of the pipe to be connected,
When the strainer is connected to the pipe connecting the expansion valve and the evaporator, the length of the pipe connecting the strainer and the evaporator is the length of the expansion valve and the strainer. A refrigeration cycle device that is shorter than the length of the pipe to be connected. With more indoor units
The refrigeration cycle apparatus according to claim 1, wherein the strainer is housed in the indoor unit. The strainer is connected to the refrigerant circuit at least before and after at least one of an outdoor heat exchanger that functions as one of the condenser or the evaporator and an indoor heat exchanger that functions as the condenser or the other of the evaporator. It has a first strainer and a second strainer,
The refrigerant circuit further has a four-way valve.
The four-way valve is configured to switch the flow of the refrigerant from the compressor to the outdoor heat exchanger or the indoor heat exchanger depending on the cooling operation and the heating operation.
When the first strainer and the second strainer are connected to the refrigerant circuit before and after the indoor heat exchanger, the first strainer is the pipe connecting the expansion valve and the indoor heat exchanger. The second strainer is connected to the pipe connecting the indoor heat exchanger and the four-way valve, and the length of the pipe connecting the first strainer and the indoor heat exchanger. The length of the pipe connecting the expansion valve and the first strainer is shorter than the length of the pipe connecting the second strainer and the indoor heat exchanger, and the length of the pipe connecting the second strainer and the indoor heat exchanger is shorter than the length of the four-way valve and the first strainer. 2 Shorter than the length of the pipe connecting the strainer,
When the first strainer and the second strainer are arranged in front of and behind the outdoor heat exchanger in the refrigerant circuit, the first strainer is the pipe connecting the four-way valve and the outdoor heat exchanger. The second strainer is connected to the pipe connecting the outdoor heat exchanger and the expansion valve, and the length of the pipe connecting the first strainer and the outdoor heat exchanger. The length of the pipe connecting the four-way valve and the first strainer is shorter than the length of the pipe connecting the second strainer and the outdoor heat exchanger, and the length of the pipe connecting the second strainer and the outdoor heat exchanger is shorter than the length of the expansion valve and the first strainer. 2. The refrigeration cycle apparatus according to claim 1 or 2, which is shorter than the length of the pipe connecting the strainer. The refrigerant circuit further includes a bypass pipe and a two-way valve.
When the first strainer and the second strainer are connected to the refrigerant circuit before and after the indoor heat exchanger, the bypass pipe connects the indoor heat exchanger and the second strainer. It is connected to the pipe and the pipe connecting the four-way valve and the second strainer.
The two-way valve is connected to the pipe connecting the indoor heat exchanger and the second strainer and the bypass pipe.
The two-way valve is configured to allow the refrigerant to flow from the second strainer to the indoor heat exchanger during the heating operation, and to flow the refrigerant from the indoor heat exchanger to the bypass pipe during the cooling operation. , The refrigeration cycle apparatus according to claim 3. The refrigerant circuit further includes a bypass pipe and a two-way valve.
When the first strainer and the second strainer are connected to the refrigerant circuit before and after the outdoor heat exchanger, the bypass pipe connects the outdoor heat exchanger and the first strainer. It is connected to the pipe and the pipe connecting the four-way valve and the first strainer.
The two-way valve is connected to the pipe connecting the outdoor heat exchanger and the first strainer and the bypass pipe.
The two-way valve is configured to allow the refrigerant to flow from the first strainer to the outdoor heat exchanger during the cooling operation, and to flow the refrigerant from the outdoor heat exchanger to the bypass pipe during the heating operation. , The refrigeration cycle apparatus according to claim 3. The refrigerant circuit further includes a bypass pipe, a first check valve, and a second check valve.
When the first strainer and the second strainer are connected to the refrigerant circuit before and after the indoor heat exchanger, the bypass pipe connects the indoor heat exchanger and the second strainer. It is connected to the pipe and the pipe connecting the four-way valve and the second strainer.
The first check valve is connected to the pipe connecting the indoor heat exchanger and the second strainer between the second strainer and the bypass pipe, and is connected to the indoor from the second strainer. It is configured to allow the refrigerant to flow through the heat exchanger and prevent the refrigerant from flowing from the indoor heat exchanger to the second strainer.
The second check valve is connected to the bypass pipe and is configured to prevent the refrigerant from flowing from the four-way valve to the indoor heat exchanger, and is configured to prevent the refrigerant from flowing from the indoor heat exchanger to the indoor heat exchanger. The refrigeration cycle apparatus according to claim 3, wherein the refrigerant is configured to flow through a four-way valve. The refrigerant circuit further includes a bypass pipe, a first check valve, and a second check valve.
When the first strainer and the second strainer are connected to the refrigerant circuit before and after the outdoor heat exchanger, the bypass pipe connects the outdoor heat exchanger and the first strainer. It is connected to the pipe and the pipe connecting the four-way valve and the first strainer.
The first check valve is connected between the first strainer and the bypass pipe to the pipe connecting the outdoor heat exchanger and the first strainer, and is connected to the outdoor from the first strainer. It is configured to allow the refrigerant to flow through the heat exchanger and prevent the refrigerant from flowing from the outdoor heat exchanger to the first strainer.
The second check valve is connected to the bypass pipe and is configured to prevent the refrigerant from flowing from the four-way valve to the outdoor heat exchanger, and is configured to prevent the refrigerant from flowing from the outdoor heat exchanger to the outdoor heat exchanger. The refrigeration cycle apparatus according to claim 3, wherein the refrigerant is configured to flow through a four-way valve. At least one of the condenser and the evaporator has a heat transfer tube and
The refrigeration cycle apparatus according to any one of claims 1 to 7, wherein the heat transfer tube is composed of a flat multi-hole tube.

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