JP2001255045A - Refrigerant circulation heat transfer unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant circulation heat transfer unit in which a strainer provided in a refrigerant circuit can be replaced easily in a short time and loss of refrigerant can be reduced at the time of replacing operation. SOLUTION: A strainer 74 (78) for removing foreign matters contained in a refrigerant circuit can be set removably in the refrigerant circuit while being clamped by two valves 73, 75 (77, 79).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant circulation type heat transfer device configured to circulate refrigerant discharged from a compressor to a predetermined refrigerant circuit.

[0002]

2. Description of the Related Art Conventionally, as a refrigerant circulating heat transfer device as described above, for example, an indoor heat exchanger and an outdoor heat exchanger functioning as a condenser or an evaporator have been provided, and a compressor, an indoor heat exchanger and Heating and cooling are performed by circulating the refrigerant in the refrigerant circuit including the outdoor heat exchanger, and the refrigerant circuit is provided with a four-way valve for switching the circulation direction of the refrigerant with respect to the indoor heat exchanger and the outdoor heat exchanger. An air conditioner (air conditioner) configured to be able to switch between heating and cooling by the above operation is generally known.

This air conditioner is composed of an outdoor unit having an outdoor heat exchanger and a plurality of indoor units having an indoor heat exchanger. When this air conditioner is actually installed, first, an outdoor unit and a plurality of indoor units are installed at predetermined positions, piped, brazed, and connected. Next, the refrigerant is charged while the air in the refrigerant circuit is released. After the filling of the refrigerant is completed, test operation of cooling and heating is performed, and dust such as oxide scale generated during brazing remaining in the piping of the refrigerant circuit is captured in a high-performance strainer element provided in the refrigerant circuit. Also, make sure that no malfunction occurs in the compressor and the like. Since the strainer that has captured the garbage increases the pressure loss and lowers the cooling / heating capacity, the refrigerant once filled in the refrigerant circuit is removed after the test operation and replaced with another simple strainer. Then, the refrigerant circuit is charged while the air in the refrigerant circuit is evacuated again, thereby completing the installation of the air conditioner.

[0004]

In the refrigerant circulation type heat transfer apparatus described above, for example, when the strainer is replaced after the test operation, the refrigerant filled in the refrigerant circuit is once removed, replaced with another strainer, and the air in the refrigerant circuit is released again. Therefore, there is a problem that the refrigerant is lost during the replacement work, and the replacement work is troublesome and the work time is lengthened.

The present invention has been made to solve the above-mentioned problems of the prior art, and can easily replace a strainer provided in a refrigerant circuit in a short time without removing the refrigerant.
It is an object of the present invention to provide a refrigerant circulation type heat transfer device that can reduce the loss of the refrigerant during the replacement operation.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a refrigerant circulation type heat transfer device configured to circulate a refrigerant discharged from a compressor to a predetermined refrigerant circuit. The strainer for removing the water is detachably provided in the refrigerant circuit between the two valves (claim 1).

According to this configuration, when replacing the strainer, a series of steps of closing the two valves sandwiching the strainer of the refrigerant circuit, removing the strainer, replacing the strainer with another strainer, and then opening both valves. By performing the work, the strainer can be replaced without removing the refrigerant charged in the refrigerant circuit. For this reason,
As in the related art, when the strainer is replaced, there is no need to remove the refrigerant filled in the refrigerant circuit once, replace the refrigerant with another strainer, and perform the air filling of the refrigerant circuit again while filling the refrigerant circuit. Therefore, the operation is simple, the operation time can be reduced, and the loss of the refrigerant during the replacement operation can be reduced.

Further, the present invention includes an outdoor heat exchanger and an indoor heat exchanger functioning as a condenser or an evaporator, and includes an outdoor unit-side refrigerant circuit including a compressor and an outdoor heat exchanger, and an indoor heat exchanger. A refrigerant circuit is formed by connecting the indoor unit-side refrigerant circuit to form a refrigerant circuit, and circulating the refrigerant through the refrigerant circuit to form an air conditioner configured to perform at least one of heating and cooling. In the device, in the outdoor unit-side refrigerant circuit, a strainer for removing foreign substances contained in the refrigerant circuit is provided by two valves in the middle of a refrigerant pipe leading to a connection portion to the indoor unit-side refrigerant circuit. It is provided so as to be detachable with being sandwiched (claim 2).

[0009] The refrigerant circulation heat transfer device constituting the air conditioner also has the same functions and effects as described above. More specifically, for example, when this apparatus is actually installed, an outdoor unit including a compressor and an outdoor heat exchanger and a plurality of indoor units including an indoor heat exchanger are installed at predetermined positions and piped. Brazing is performed and connected to form a refrigerant circuit. For this reason, there is a possibility that dust such as oxide scale generated during brazing may remain in the piping of the refrigerant circuit,
In the outdoor unit-side refrigerant circuit, a foreign substance contained in the refrigerant circuit is reliably removed by a strainer provided in the middle of a refrigerant pipe leading to a connection portion to the indoor unit-side refrigerant circuit. Etc. can be prevented from occurring. The strainer that has captured the trash can be replaced with another simple strainer after test operation because the pressure loss increases and the cooling and heating capacity decreases, but the strainer can be replaced without removing the refrigerant charged in the refrigerant circuit Therefore, the operation is simple, the operation time can be shortened, and the loss of the refrigerant during the replacement operation can be reduced.

[0010]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an air conditioner as an example of a refrigerant circulation type heat transfer device to which the present invention is applied. This air conditioner comprises an outdoor unit 1a and a plurality of indoor units 1b.
It is composed of The air conditioner includes a water-cooled gas engine 2 (hereinafter abbreviated as engine) and an engine 2
A refrigerant circuit 30 having a compressor 20 driven by
A cooling water circuit 90 for cooling the engine 2 is provided, and the refrigerant circuit 30 is disposed over the outdoor unit 1a and each indoor unit 1b.
The compressor 20, the engine 2, the cooling water circuit 90 and the like in the refrigerant circuit 30 are arranged in the outdoor unit 1a.

An intake pipe 3 is connected to the engine 2.
The intake pipe 3 is provided with an air cleaner 4, a mixer 5, a control valve 6, and the like. A fuel supply pipe 7 for guiding fuel from a fuel gas supply source (not shown) is connected to the mixer 5, and a flow control valve 8, a governor 9, and an electromagnetic valve 10 are interposed in the fuel supply pipe 7. . Then, the fuel gas and the air are mixed by the mixer 5, and the air-fuel mixture is supplied to the engine 2 while the amount of the air-fuel mixture is adjusted by the control valve 6 and the like.

An exhaust pipe 11 is led out of the engine 2 and is provided with a catalyst 12 for purifying exhaust gas, an exhaust gas heat exchanger 13, a silencer 14, a drain separator 15, and the like. A drain filter 16 is connected to the drain separator 15 and the silencer 14. An oil tank 18 is connected to an oil pan below the engine 2 via an oil supply pipe 17, and the oil supply pipe 17 is provided with a solenoid valve 19 for adjusting an oil supply amount. .

The refrigerant circuit 30 passes the refrigerant discharged from the compressor 20 through a condenser, a throttle, and an evaporator.
To form a closed circuit for circulating so as to return to. In the present embodiment, a four-way valve 40 for switching the refrigerant circulation path according to the time of cooling and the time of heating is provided, and the outdoor heat exchanger 31 configuring one of the condenser and the evaporator and the other is configured. And an electronic expansion valve 33 that constitutes a restrictor, and further includes a main accumulator 34, a sub accumulator 35, and the like.

The outdoor unit 1a in the refrigerant circuit 30
Is the discharge port of the compressor 20 and the first port 40 of the four-way valve 40.
a, a heat-exiting heat exchange between the discharge-side conduit 41 connecting the second port 40a, the second port 40b of the four-way valve 40 and the suction port of the compressor 20, and a third port 40c of the four-way valve 40. A pipe 43 between the outdoor heat exchanger 31 and the first joint 46, a fourth port 40d of the four-way valve 40, and a second joint 47. And a pipe line 45 disposed between them. In addition, the indoor heat exchanger 32 and the electronic expansion valve 33 are provided in the indoor unit 1b, and a pipe 48 connected to the electronic expansion valve 33 is connected to the first joint 46, and the indoor heat exchanger 32
Is connected to the second joint 47.

More specifically, the refrigerant circuit 30 will be described. An oil separator 50 for separating oil from high-pressure refrigerant is provided in the discharge-side pipe 41, and the separated oil passes through a strainer 51 and a capillary tube 52. Suction side pipeline 4
2 to the downstream part.

The upstream side (close to the four-way valve) of the suction side pipe 42 exchanges heat between the engine cooling water guided from the cooling water circuit 90 and the refrigerant passing through the suction side pipe 42. A heat accumulator 53 is provided, and a main accumulator 34 is provided downstream of the heat exchanger 53. A sub accumulator 35 is provided for the main accumulator 34, and pipes 54a, 5
4b.

The suction-side pipe 42 includes an upstream pipe 42a between the four-way valve 40 and the main accumulator 34, a pipe 42b connected to the gaseous refrigerant outlet of the main accumulator 34, and a pipe 42b. And a downstream pipe 42c connected via a U-shaped pipe 42e in parallel with the capillary 42d. The downstream pipe 42c is connected to the suction port of the compressor 20. In addition, the oil in the compressor 20 is transferred to the compressor 2 again through a pipe 42 c outside the compressor 20.
An oil circulation passage 55 for returning the oil from the suction port 0 to lubricate the compressor 20 is connected to the conduit 42c from the compressor 20 via a strainer 56, an on-off valve 57 and a capillary tube (throttle) 58. The on-off valve 57 is opened during operation of the compressor 20 and closed during stoppage.

The accumulators 34 and 35 separate the gas-phase refrigerant and the liquid-phase refrigerant in the suction-side pipe 42 and separate the gas-phase refrigerant into the capillary 42 d and the downstream pipe 4.
The refrigerant is sucked into the compressor 20 via 2c.
In addition, the accumulators 34 and 3 may be operated when the operation is stopped.
5 so that the lubricating oil in the accumulator 3 can be derived.
The lower ends of the pipes 4 and 35 are connected to the U-shaped pipe 42e via a passage having a strainer 59 and a control valve 60.

A predetermined high level position and a predetermined low level position (for example, the lowest position) of the main accumulator 34 are connected to a U-shaped conduit 42e through liquid level detecting passages 61 and 62, and the respective passages 61 and 62. Are provided with strainers 63 and 64 and capillaries 65 and 66, respectively, and heaters 67 and 68 and temperature sensors 69 and 70 are provided for the passages 61 and 62, respectively. And passage 6
The liquid surface level in the accumulator, that is, the storage amount of the liquid-phase refrigerant, is detected by detecting the temperature change in the passage when the liquid-phase refrigerant is led out to 1, 62.

The outdoor heat exchanger 31 and the first joint 46
A heat exchanger 71, a filter dryer 72, a valve 73, a strainer 74, a valve 75, and the like are interposed in the pipeline 44 between them. Further, a bypass passage 76 connecting the pipe 44 and the pipe 45 is formed so as to pass through the heat exchanger 71,
Heat exchange is performed between the refrigerant flowing through the bypass passage 76 and the refrigerant flowing through the pipe line 44. The flow rate in the bypass passage 76 is adjusted by a control valve 76a. Also, the four-way valve 40 and the second joint 47
The valve 45, the strainer 78, the valve 7
9 etc. are interposed.

The refrigerant circuit 30 includes refrigerant temperature sensors 80 and 81 for detecting the temperature of the refrigerant in the suction pipe 42 and a refrigerant temperature sensor 8 for detecting the temperature of the refrigerant in the discharge pipe 41.
2. Compressor temperature sensor 83, high pressure side pressure sensor 84, low pressure side pressure sensor 85, refrigerant temperature sensors 86 and 87 on the upstream and downstream sides of the electronic expansion valve 33, indoor temperature sensor 88,
An outside temperature sensor 89 and the like are provided.

The cooling water circuit 90 includes a main water pump 92, an exhaust gas heat exchanger 13, an engine-side water pump 93, an engine water jacket 94, a thermostat 95, a linear three-way valve 96, a radiator 97, and the like. A main cooling water passage 91 is provided, and a passage 98 for guiding engine waste heat to the heat exchanger 53 is provided. The cooling water circulating in the main cooling water passage 91 is supplied from the engine water jacket 94 to the radiator 9 through the passage 98.
On the way to 7, the main cooling water passage 91 branches off from the main cooling water passage 91 via a linear three-way valve 96, passes through the heat exchanger 53, and joins the main cooling water passage 91. Further, a fan 99 is provided for promoting heat exchange between the cooling water and the outside air in the radiator 97 and heat exchange between the refrigerant and the outside air in the outdoor heat exchanger 31.

The linear three-way valve 96 is connected to the main cooling water passage 9.
The rate at which the cooling water is diverted from 1 to the passage 98 can be changed linearly. The cooling water that has received the engine waste heat is guided to the linear three-way valve 96, and is moved to the operating position of the linear three-way valve 96. By being guided to the heat exchanger 53 via the passage 98 by a corresponding amount, the heat exchanger 53
Thus, the engine waste heat is supplied to the low-pressure refrigerant in the suction-side pipe line 42 of the refrigerant circuit 30.

The specific structure of the compressor 20 applied to the refrigerant circuit 30 is not particularly limited in the present invention.
A multi-type compressor having a plurality of compressor bodies 122 is connected to the output shaft 22 of the engine 2 via the electromagnetic clutch 21.

In the air conditioner having such a configuration, during the cooling operation, the four-way valve 40 is controlled to a state shown by a solid line in FIG. When the compressor 20 is driven by the engine 2 in this state, the high-pressure gaseous refrigerant discharged from the compressor 20 passes through the discharge-side pipe 41, the four-way valve 40, and the pipe 43 to exchange outdoor heat. The refrigerant is sent to the heat exchanger 31 and the outdoor heat exchanger 31 functions as a condenser. Here, the refrigerant is cooled and liquefied by the outside air, and the refrigerant liquid is cooled by the heat exchanger 71 and the pipe 4.
After passing through 4, 48, it is expanded and decompressed by an electronic expansion valve 33 constituting a throttle, and then sent to the indoor heat exchanger 32. Then, the indoor heat exchanger 32 functions as an evaporator, where the refrigerant takes heat from the room and evaporates, thereby performing cooling. The evaporated refrigerant is supplied to the pipe 49, the pipe 45, the four-way valve 4
0, passing through the suction-side refrigerant pipe 42 and passing through the accumulator 34,
It is returned to the compressor 20 via 35.

On the other hand, during the heating operation, the four-way valve 40
Is controlled to the state shown by the broken line. In this state, the compressor 20
Is driven by the engine 2 so that the compressor 2
0 is discharged from the refrigerant pipe 41 on the discharge side, the four-way valve 4
0, the pipe 45 and the pipe 49 are sent to the indoor heat exchanger 32, and the indoor heat exchanger 32 functions as a condenser, where the refrigerant releases heat into the room and liquefies, thereby heating the room. Is performed. The liquefied refrigerant is expanded and decompressed by the electronic expansion valve 33, and then the pipe 48, the pipe 44, the heat exchanger 7
1 to the outdoor heat exchanger 31 and the outdoor heat exchanger 3
1 functions as an evaporator, in which the refrigerant takes heat of the outside air and evaporates, and the evaporated refrigerant passes through a pipe 43, a four-way valve 40, a suction-side refrigerant pipe 42, accumulators 34 and 35, and a compressor. Returned to 20.

Next, an outline of a specific structure of the outdoor air conditioning unit 1a will be described with reference to FIG. The outdoor air-conditioning unit 1a comprises a lower engine room 102 and an upper outdoor heat exchange chamber 10
1 and 1. The engine room 102 includes the refrigerant circuit 30
The accumulators 34 and 35, the oil separator 50, and the like are arranged on the floor 105, and the front side is covered with a pair of left and right front plates 103a and 103b. In the outdoor heat exchange chamber 101, a fan 99 is disposed above, and the front and rear sides are opened so that outside air can be introduced, and a wire mesh 104 functioning as a filter is disposed in the front and rear open portions. With such a structure, when the fan 99 is driven during the operation during cooling or heating, air is forcibly sent out from the outdoor heat exchange chamber 101 to the outside and the outside air is accordingly discharged from the front and rear wire meshes 104 to the outside. After flowing into the heat exchange chamber 101, heat exchange in the outdoor heat exchanger 31 and the radiator 97 is promoted by such a flow of air.

By the way, the refrigerant circulation type heat transfer device constituting the above-described air conditioner is composed of an outdoor unit 1a and a plurality of indoor units 1b. Indoor unit 1b
Is installed in a predetermined position, connected to a pipe and brazed. Next, the refrigerant circuit 30 is filled with refrigerant while bleeding air. After the completion of the charging of the refrigerant, a cooling and heating test operation is performed, and dust such as oxide scale generated during brazing remaining in the piping of the refrigerant circuit 30 is removed by a high-performance strainer 7.
It is captured in the 4 ', 78' elements so that no trouble occurs in the compressor 20 or the like. The strainers 74 ′ and 78 ′ that have captured the refuse increase the pressure loss and decrease the cooling and heating capacity.
Replace with 78. In the present invention, a mounting structure is provided in which the strainer can be attached and detached without removing the refrigerant in the refrigerant circuit 30 when replacing the strainer.

More specifically, the strainers 74, 78
As shown in FIG. 3, are arranged side by side vertically to an accumulator 34 provided in the engine room 102. As shown in FIG. 4A, the mounting portion of the strainer 78
Valves 77 and 79 are provided above and below the strainer 78, and similarly, the mounting portion of the strainer 74 is provided with valves 73 and 75 above and below the strainer 74 as shown in FIG.
Is provided.

More specifically, as shown in FIG. 4A and FIG. 5A, one connecting portion 78a of the strainer 78 is connected to a pipe 111 via a gasket to form a flange 112,
The connection portion 78b is connected to the pipe 118 by tightening the flanges 115 and 116 with bolts 117 via a gasket.

On the other hand, one connecting portion 74 of the strainer 74
a is a pipe 1 as shown in FIGS. 4 (B) and 5 (B).
21 is connected via a flare nut 122, and the other connecting portion 74 b is connected to a pipe 124 via a flare nut 123.
Connected through.

Therefore, when replacing the strainer 74 (78), after closing these valves 73, 75 (77, 79), the strainer 74 (78) is removed and replaced with another strainer. Valve 73, 75
By performing a series of operations of opening (77, 79), the strainer can be attached and detached without removing the refrigerant in the refrigerant circuit 30.

That is, when replacing the strainer 78, after closing these valves 77 and 79, the bolt 1
14 (117) to loosen the flanges 112, 113 (11
5, 116), the strainer 78 is removed, and another strainer is attached in the reverse procedure, and the valves 77 and 79 are opened to complete the replacement.

When replacing the strainer 74,
After closing these valves 73 and 75, the connection portion 74a
Flare nut 122 screwed and fastened to (74b)
(123) is loosened, the strainer 74 is removed, and then another strainer is attached in the reverse procedure. Then, the valves 73 and 75 are opened.
The exchange is completed.

The arrows in FIG. 5 (A) indicate the flow of fluid in the strainer 78 during the heating operation, whereby dust is captured in the element 78c. Similarly, the arrow in the figure in FIG.
The drawing shows the flow of the fluid in the strainer 74 during the cooling operation, whereby dust is captured in the element 74c.

After the heating operation, the element 78c in the strainer 78 is replaced. After the cooling operation, the element 74c in the strainer 74 is replaced.
After replacing the element 74c in the strainer 74 and subsequently performing the heating operation, the element 78c in the strainer 78 is replaced.
Exchange.

In any case, in the heating operation, the dust on the indoor unit 1b side and in the pipes 48 and 49 is trapped outside the element 74c, and in the cooling operation, the dust is collected on the indoor unit 1b side and the pipe line. Since the refuse 48 and 49 are captured outside the element 78c, the strainer 74 and the inner element 74c are washed when the element 78c is replaced after the heating operation, and when the element 74c is replaced after the cooling operation, the strainer 78 is removed. It is preferable to perform cleaning of the internal element 78c.

Furthermore, the cooling operation element 74c
Of the outdoor unit 1a is stopped.
The dirt not only on the side but also on the indoor unit 1b side and the pipes 48 and 49 is trapped outside the element 78c, and during the heating operation, the attachment of the element 78c into the strainer 78 is stopped, and the dirt is trapped outside the element 74c. You may do it. After the test operation, clean elements 74c and 78c are mounted in the strainers 74 and 78, respectively.

As described above, the refrigerant circulation type heat transfer device of the present invention
It is needless to say that the present invention is not limited to the specific configuration of the above-described embodiment, but may be modified, added or deleted as needed.

For example, in the above description, an example is shown in which the strainer is detachably provided so as to be sandwiched between two valves in the refrigerant circuit on the outdoor unit side of the refrigerant circulation type heat transfer device constituting the air conditioner. However, the present invention is not limited to this, and a strainer may be detachably provided in the refrigerant circuit on the indoor unit side between two valves. Further, the strainer may not be built in the outdoor unit or the indoor unit, and the strainer may be provided in a piping route between the two units.

[0042]

As described above, in the refrigerant circulation type heat transfer device of the present invention, since the strainer is detachably provided in the refrigerant circuit with the two valves interposed therebetween, when the strainer is replaced, After closing the two valves sandwiching the strainer of the refrigerant circuit, remove the strainer, replace it with another strainer, and then perform a series of operations of opening both valves, so that the refrigerant filled in the refrigerant circuit is not removed. You can replace the strainer. Therefore, the work is simple and the work time can be shortened.
It is also possible to reduce the loss of the refrigerant during the replacement operation.

[0043] Further, an outdoor unit-side refrigerant circuit including an outdoor heat exchanger and an indoor heat exchanger functioning as a condenser or an evaporator, and including an compressor and an outdoor heat exchanger, and an indoor unit-side refrigerant including an indoor heat exchanger The refrigerant circuit is connected to the refrigerant circuit to perform at least one of heating and cooling by circulating the refrigerant in the refrigerant circuit. In the outdoor unit-side refrigerant circuit, the indoor unit side A refrigerant forming an air conditioner in which a strainer for removing foreign substances contained in the refrigerant circuit is detachably provided between two valves in a refrigerant pipe leading to a connection portion to the refrigerant circuit. The circulating heat transfer device also has the same function and effect as described above.

More specifically, for example, when this apparatus is actually installed, an outdoor unit including a compressor and an outdoor heat exchanger and a plurality of indoor units including an indoor heat exchanger are installed at predetermined positions. Since the refrigerant circuit is formed by connecting the pipes and brazing and connecting them, there is a possibility that dust such as oxide scale generated at the time of brazing may remain in the pipes of the refrigerant circuit. In the circuit, a foreign substance contained in the refrigerant circuit is reliably removed by a strainer provided in the middle of the refrigerant pipe leading to a connection portion to the indoor unit side refrigerant circuit, which causes a problem in the compressor or the like. Can not be. The strainer that has captured the garbage increases the pressure loss and decreases the cooling and heating capacity,
After the test run, the strainer is replaced with another simple strainer.However, the strainer can be replaced without removing the refrigerant charged in the refrigerant circuit. Can also reduce the loss of the refrigerant in.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an example of a refrigerant circulation type heat transfer device of the present invention.

FIG. 2 is a front view showing a configuration example of an outdoor unit of the refrigerant circulation type heat transfer device of the present invention.

FIG. 3 is a perspective view showing a configuration example of a peripheral portion of a strainer in an engine room in the refrigerant circulation type heat transfer device of the present invention.

FIG. 4 is a front view showing a configuration example of a strainer mounting portion in the refrigerant circulation type heat transfer device of the present invention, wherein (A) shows a strainer mounting portion provided on a discharge side conduit at the time of heating;
(B) shows a mounting portion of a strainer provided in the discharge side pipeline at the time of cooling.

FIG. 5A is a sectional view taken along the line P-P in FIG.
Represents a QQ cross-sectional view of FIG.

[Explanation of symbols]

 1a Outdoor unit 1b Indoor unit 20 Compressor 30 Refrigerant circuit 31 Outdoor heat exchanger 32 Indoor heat exchanger 74, 78 Strainer 73, 75, 77, 79 Valve

Claims (2)

[Claims] 1. A refrigerant circulation type heat transfer device configured to circulate a refrigerant discharged from a compressor to a predetermined refrigerant circuit, wherein a strainer for removing foreign matter contained in the refrigerant circuit is: A refrigerant circulation type heat transfer device, which is provided in a refrigerant circuit so as to be detachable with two valves interposed therebetween. 2. An outdoor unit-side refrigerant circuit including an outdoor heat exchanger and an indoor heat exchanger functioning as a condenser or an evaporator, including an compressor and an outdoor heat exchanger, and an indoor unit-side refrigerant including an indoor heat exchanger. A refrigerant circuit is configured by connecting the refrigerant circuit to the circuit, and the refrigerant is circulated through the refrigerant circuit to heat the refrigerant.
In a refrigerant circulation type heat transfer device that forms an air conditioner configured to perform at least one of cooling, in the outdoor unit-side refrigerant circuit, in the middle of a refrigerant pipe reaching a connection portion to the indoor unit-side refrigerant circuit. , A strainer for removing foreign substances contained in the refrigerant circuit,
A refrigerant circulation type heat transfer device, which is provided so as to be detachably sandwiched between two valves.