JP3222922U - Cleaning device for air conditioning system - Google Patents

Abstract

The present invention provides a cleaning device for an air conditioning system that prevents separation and separation of sludge and metal powder that have been captured in the same refrigerant flow during air conditioning operation, and that can reduce costs and improve work efficiency. A cleaning apparatus A is provided in a liquid side pipe 3 and permits an indoor unit side check valve 19 that allows a refrigerant R to flow from an outdoor unit 1 side to an indoor unit 2 side. An outdoor unit side check valve 20 that allows the refrigerant to flow to the unit side, a filter device 21 that removes sludge and metal powder contained in the refrigerant, and a liquid on the outdoor unit side relative to the position of the outdoor unit side check valve An inlet side pipe 22 connecting the side pipe and the inlet of the filter device, an inlet side check valve 23, a liquid side pipe between the indoor unit side check valve and the outdoor unit side check valve, and an outlet of the filter device A branch pipe that connects the outlet side pipe 24 that connects to the inlet side pipe on the filter device side relative to the position of the inlet side check valve and the liquid side pipe on the indoor unit side relative to the position of the indoor unit side check valve. 25 and a branch-side check valve 26. [Selection] Figure 1

Description

  The present invention is used in a commercial air conditioning system installed in an office building or factory, or a home air conditioning system installed in a building such as a private house or apartment, and operates while operating the air conditioning system. Related to a cleaning device of an air conditioning system that removes sludge and metal powder contained in the air to purify the refrigerant, and in particular, the flow of the refrigerant flowing in the cleaning device is the same during the cooling operation and the heating operation. The present invention relates to a cleaning device for an air conditioning system.

  In general, in a commercial air conditioning system or a domestic air conditioning system, if the refrigerant is operated for a long time, the refrigerant flowing in the refrigerant circuit and the lubricating oil in the compressor are contaminated by sludge, metal powder, and the like.

  Further, in the air conditioning system, when replacing an outdoor unit or an indoor unit with a new one, the existing liquid side pipe and gas side pipe that connected the old outdoor unit and the indoor unit are reused. However, metal powder generated by wear of a compressor mounted on an old outdoor unit remains in the existing liquid side pipe and gas side pipe.

  In this way, if there is sludge, metal powder, etc. in the refrigerant circuit of the air conditioning system, the compressor will fail, or the expansion valve or capillary tube will become clogged, resulting in the reliability of the air conditioning system. Will be seriously damaged.

  Therefore, in an air conditioning system, a filter, a strainer, or the like is provided on the liquid side pipe or the gas side pipe to remove sludge or metal powder contained in the refrigerant in the refrigerant circuit.

  However, in the cooling and heating system, the direction of the refrigerant circulating in the refrigerant circuit is reversed between the cooling operation and the heating operation. Therefore, when the operation of the cooling and heating system is switched, the refrigerant or the like is trapped by the reverse flowing refrigerant. Sludge and metal powder may peel and separate from the filter and enter the compressor and expansion valve.

  As an air conditioning system that solves this problem, for example, an air conditioner (air conditioning system) described in Japanese Patent Application Laid-Open No. 2008-032247 is known (see Patent Document 1).

  That is, as shown in FIG. 4, the air conditioner includes an outdoor unit 34 including a compressor 30, a four-way valve 31, an outdoor heat exchanger 32, an outdoor expansion valve 33, and the like, an indoor heat exchanger 35, and an indoor expansion valve. An indoor unit 37 having 36 and the like is connected by a liquid refrigerant pipe 38 and a gas refrigerant pipe 39 to form a refrigerant circuit, and a connection port between the outdoor unit 34 and the liquid refrigerant pipe 38 and an outdoor unit 34 and a gas refrigerant pipe. The strainers 40 and 41 for capturing solid foreign matters circulating in the refrigerant circuit together with the refrigerant are respectively provided at the connection ports with 39.

  In FIG. 4, 42 is a receiver, 43 is a liquid blocking valve, and 44 is a gas blocking valve.

  Thus, according to the air conditioner, since the strainers 40 and 41 for capturing the solid foreign substances are provided on both the liquid refrigerant pipe 38 side and the gas refrigerant pipe 39 side, the solid foreign substances are provided during the cooling operation. Is captured by the strainer 41 on the gas refrigerant pipe 39 side, and solid foreign matter is captured by the strainer 40 on the liquid refrigerant pipe 38 side during the heating operation.

  As a result, the air conditioner can prevent solid foreign matter from entering the outdoor unit 34 even if the direction in which the refrigerant circulates is switched during the cooling operation or the heating operation. Further, since the strainers 40 and 41 are respectively provided at the connection port between the outdoor unit 34 and the liquid refrigerant pipe 38 and the connection port between the outdoor unit 34 and the gas refrigerant pipe 39, the liquid refrigerant pipe 38 and the gas refrigerant pipe 39 are provided. The solid foreign matters remaining in the gas are reliably captured by the strainers 40 and 41, and there is no possibility of entering the compressor 30.

JP 2008-032247 A

  However, in the air conditioner, when the refrigerant inflow direction is switched at the time of switching between cooling and heating operations, the solid foreign matter once captured by one strainer 40 (or 41) is peeled and separated from the strainer 40 (or 41). Then, it flows through the indoor unit 37 and is captured by the other strainer 41 (or 40). Every time the operation is switched, a large amount of solid foreign matter returns to the indoor unit 37, and the indoor expansion valve There is a problem that solid foreign matter bites into 36 and the like.

  In addition, since the air conditioner must be provided with strainers 40 and 41 on both the liquid refrigerant pipe 38 side and the gas refrigerant pipe 39 side, a plurality of strainers 40 and 41 must be prepared, and the cost is reduced. At the same time, there is a problem that the installation in the air conditioner takes time and the work efficiency is poor.

  The present invention has been made in order to solve the above-described problems, and prevents the sludge and metal powder captured by the same refrigerant flow during cooling operation and heating operation from being separated or separated. The main object of the present invention is to provide a cleaning device for an air conditioning system that can reduce costs and improve work efficiency.

  In order to achieve the above object, a cleaning device for an air conditioning system according to the present invention is a cleaning device used in an air conditioning system in which an outdoor unit and an indoor unit are connected by a liquid side pipe and a gas side pipe. An indoor unit side check valve that allows refrigerant to flow from the outdoor unit side to the indoor unit side, and a liquid side pipe on the outdoor unit side relative to the position of the indoor unit side check valve. Outdoor unit side check valve that allows the flow of refrigerant from the side to the outdoor unit side, a filter device that has an inlet and an outlet for the refrigerant, and removes sludge and metal powder contained in the refrigerant, and an outdoor unit side check An inlet-side pipe connecting the liquid-side pipe on the outdoor unit side and the inlet of the filter device with respect to the valve position, and an inlet-side check valve interposed in the inlet-side pipe and allowing the refrigerant to flow to the filter device side And the liquid side piping and filter device between the indoor unit side check valve and the outdoor unit side check valve An outlet side pipe that connects the outlet, and a branch pipe that connects the inlet side pipe on the filter device side with respect to the position of the inlet side check valve and the liquid side pipe on the indoor unit side with respect to the position of the indoor unit side check valve And a branch-side check valve that is interposed in the branch pipe and allows the refrigerant to flow to the inlet-side pipe.

  The filter device includes a casing having an inlet and an outlet for a refrigerant, a permanent magnet that is housed in the casing and removes magnetic metal powder contained in the refrigerant, and a sludge contained in the refrigerant that is contained in the casing. And a metal mesh filter that removes sludge that is contained in the casing and cannot be removed by the filter material.

  The filter material is preferably a compressed felt filter material, and the metal mesh filter is preferably a 4000 mesh stainless steel mesh filter.

  The cleaning device for an air conditioning system according to the present invention is provided in the liquid side pipe so that the flow of the refrigerant is the same during the cooling operation and the heating operation. Therefore, sludge and metal powder captured by the cleaning device are used. However, sludge and metal powder can be prevented from entering the outdoor unit or the indoor unit. As a result, the air conditioning system can be operated without impairing the reliability of the air conditioning system.

  In addition, since the cleaning device for an air conditioning system according to the present invention is provided only in the liquid side pipe, it is compared with the conventional air conditioner shown in FIG. 4 in which strainers are provided in both the liquid refrigerant pipe and the gas refrigerant pipe. Thus, the cost can be reduced, and the work efficiency can be improved because the installation in the air conditioning system does not require much work.

It is a schematic system diagram at the time of air conditioning operation of an air conditioning system incorporating a cleaning device concerning one embodiment of the present invention. It is a schematic sectional drawing of the filter apparatus used for a washing | cleaning apparatus. It is a schematic system diagram at the time of heating operation of an air conditioning system incorporating a cleaning device concerning one embodiment of the present invention. It is a schematic system diagram of the conventional air conditioner.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an example of an air conditioning system incorporating a cleaning device A according to an embodiment of the present invention. The air conditioning system connects an outdoor circuit of an outdoor unit 1 and an indoor circuit of an indoor unit 2 with a liquid side pipe 3 and a gas. A closed refrigerant circuit is formed by being connected by the side pipe 4, and a refrigerant R (for example, an HFC-type refrigerant) is enclosed in the refrigerant circuit, and the refrigerant R is circulated in the refrigerant circuit to be evaporated or condensed. The cooling or heating of the room is performed, and the sludge and the metal powder contained in the refrigerant R are removed during the operation of the cooling and heating system by the cleaning device A incorporated in the liquid side pipe 3.

  1 shows a state during cooling operation, and the refrigerant R flows in the order of the outdoor circuit of the outdoor unit 1, the liquid side piping 3, the indoor circuit of the indoor unit 2, and the gas side piping 4. ing.

  Specifically, the outdoor unit 1 includes a compressor 5, a four-way switching valve 6, an outdoor heat exchanger 7, an outdoor fan 8, an outdoor expansion mechanism 9 (an expansion valve or a capillary tube), a liquid side closing valve 10, and The gas side closing valve 11 and the like are provided, and the gas side closing valve 11, the compressor 5, the four-way switching valve 6, the outdoor heat exchanger 7, the outdoor expansion mechanism 9, and the liquid side closing valve 10 are connected by an outdoor pipe 12. An outdoor circuit is formed by sequential connection.

  The indoor unit 2 includes an indoor heat exchanger 13, an indoor fan 14, an indoor expansion mechanism 15 (expansion valve or capillary tube), a liquid side joint 16, a gas side joint 17, and the like. 16, an indoor circuit is formed by sequentially connecting the indoor side expansion mechanism 15, the indoor side heat exchanger 13 and the gas side joint 17 through the indoor side pipe 18.

  Further, the liquid side closing valve 10 of the outdoor unit 1 and the liquid side joint 16 of the indoor unit 2 are connected by the liquid side pipe 3, and the gas side closing valve 11 of the outdoor unit 1 and the gas side joint of the indoor unit 2 are connected. The refrigerant circuit of the air conditioning system is formed by connecting 17 to the gas side pipe 4.

  As shown in FIG. 1, the cleaning device A is interposed in the liquid side pipe 3 and has an indoor unit side check valve 19 that allows the flow of the refrigerant R from the outdoor unit 1 side to the indoor unit 2 side. An outdoor unit side check valve 20 that is interposed in the liquid side pipe 3 on the outdoor unit 1 side from the position of the indoor unit side check valve 19 and allows the flow of the refrigerant R from the indoor unit 2 side to the outdoor unit 1 side. A filter device 21 that has an inlet 21a ′ and an outlet 21a ″ for the refrigerant R, removes sludge and metal powder contained in the refrigerant R, and the liquid on the outdoor unit 1 side relative to the position of the outdoor unit side check valve 20 An inlet-side pipe 22 that connects the side pipe 3 and the inlet 21a 'of the filter device 21, and an inlet-side check valve 23 that is interposed in the inlet-side pipe 22 and allows the refrigerant R to flow to the filter device 21 side. The liquid side pipe 3 between the indoor unit side check valve 19 and the outdoor unit side check valve 20 and the outlet 2 of the filter device 21 The outlet side piping 24 for connecting a ″, the inlet side piping 22 on the filter device 21 side relative to the position of the inlet side check valve 23, and the liquid side on the indoor unit 2 side relative to the position of the indoor unit side check valve 19. A branch pipe 25 that connects the pipe 3 and a branch-side check valve 26 that is interposed in the branch pipe 25 and that allows the refrigerant R to flow to the inlet-side pipe 22 side are provided.

  Further, the filter device 21 used in the cleaning device A removes sludge and metal powder contained in the liquid refrigerant R. As shown in FIG. 2, a metal having an inlet 21a ′ and an outlet 21a ″ for the refrigerant R. A cylindrical casing 21a made of metal and housed in the casing 21a, one end of which is connected to the inlet 21a 'of the casing 21a, the other end is closed, and the peripheral wall has a large number of through holes 21b'. Cylindrical body 21b, a pair of disk-like permanent magnets 21c fitted to the outer peripheral surfaces of both ends of the cylindrical body 21b, and a plurality of sheets disposed between the pair of permanent magnets 21c and fitted to the outer peripheral surface of the cylindrical body 21b Disc-shaped filter material 21d, a retaining disc 21f that is fixed to the end surface of the other end of the cylindrical body 21b by a bolt 21e, and prevents the permanent magnet 21c and the filter material 21d from coming off, And a metal mesh filter 21g which is disposed between the outlet 21a "and retaining a disc f of 21a.

  In the present embodiment, a compressed disc-shaped felt filter material 21 is used for the filter material 21d, and a 4000 mesh stainless steel mesh filter is used for the metal mesh filter 21g. Yes.

  According to the filter device 21, the liquid refrigerant R flows into the casing 21a from the inlet 21a ', passes through the through hole 21b' of the cylindrical body 21b and the filter material 21d, and is a space between the casing 21a and the permanent magnet 21c. And after flowing into the space between the casing 21a and the filter material 21d, it flows out from the outlet 21a "through the metal mesh filter 21g.

  In the filter device 21, sludge contained in the refrigerant R is removed by the filter material 21d when the liquid refrigerant R passes through the filter material 21d, and the metal powder having magnetism contained in the refrigerant R is removed from the permanent magnet 21c. Further, fine sludge that has not been removed by the filter material 21d is removed by the metal mesh filter 21g.

  Next, using the cleaning device A described above, the refrigerant R in the refrigerant circuit of the air conditioning system that has been operating for a long time, or the refrigerant circuit of the air conditioning system in which the outdoor unit 1 and the indoor unit 2 are replaced with new ones. A case where the refrigerant R is washed will be described.

  First, the cleaning device A is installed in the liquid side pipe 3 of the air conditioning system that has been operating for a long time or the liquid side pipe 3 of the air conditioning system in which the outdoor unit 1 or the like is replaced, and the air conditioning system is normally operated for about one week in this state. To do.

  For example, as shown in FIG. 1, when the cleaning device A is incorporated in the liquid side pipe 3 of the cooling / heating system that is in the cooling operation state and the cooling / heating system is in the cooling operation, the refrigerant that has become high-temperature / high-pressure gas by the compressor 5. R flows into the outdoor heat exchanger 7 via the four-way switching valve 6, where it is condensed and liquefied by exchanging heat with outdoor air from the outdoor fan 8, and then converted into a low-pressure liquid by the indoor expansion mechanism 9. It flows into the liquid side pipe 3 through the side closing valve 10.

  The liquid refrigerant R flowing into the liquid side pipe 3 from the outdoor unit 1 is provided with an outdoor unit side check valve 20 for blocking the flow of the refrigerant R from the outdoor unit 1 side to the indoor unit 2 side in the liquid side pipe 3. Therefore, an inlet-side check valve 23 that flows from the liquid-side pipe 3 into the inlet-side pipe 22 connected to the liquid-side pipe 3 in a branched manner and allows the refrigerant R to flow to the filter device 21 side is provided. Then, it flows into the filter device 21.

  A branch pipe 25 is connected to the inlet side pipe 22 closer to the filter device 21 than the position of the inlet side check valve 23, but the branch pipe 25 is connected to the liquid from the inlet side pipe 22 side. Since the branch side check valve 26 that blocks the flow of the refrigerant R to the side pipe 3 side is interposed, the refrigerant R that has flowed into the inlet side pipe 22 flows to the filter device 21 side.

  The liquid refrigerant R flowing into the filter device 21 is free of sludge and metal powder contained in the refrigerant R in the filter device 21.

  That is, in the filter device 21, when the refrigerant R passes through the filter material 21d, the sludge contained in the refrigerant R is removed by the filter material 21d, and the magnetic metal powder contained in the refrigerant is removed by the permanent magnet 21c. Further, fine sludge that could not be removed by the filter material 21d is removed by the metal mesh filter 21g.

  The liquid refrigerant R from which the sludge and metal powder have been removed by the filter device 21 flows into the liquid side pipe 3 between the indoor unit side check valve 19 and the outdoor unit side check valve 20 through the outlet side pipe 24. To do.

  The liquid refrigerant R flowing into the liquid side pipe 3 is allowed to flow from the outdoor unit 1 side to the indoor unit 2 side by the indoor unit side check valve 19 provided in the liquid side pipe 3. Then, it flows into the indoor unit 2 from the liquid side pipe 3, is decompressed by the indoor side expansion mechanism 15 and then flows into the indoor side heat exchanger 13, where it evaporates by exchanging heat with the indoor air from the indoor fan 14, The room is cooled by heat of evaporation.

  The refrigerant R flowing into the liquid side pipe 3 between the indoor unit side check valve 19 and the outdoor unit side check valve 20 allows the refrigerant R to flow from the indoor unit 2 side to the outdoor unit 1 side. Although it tries to flow to the outdoor unit 1 side through the outdoor unit side check valve 20, the pressure in the liquid side piping 3 between the outdoor unit side check valve 20 and the outdoor unit 1 is the outdoor unit side check. Since the pressure in the liquid side pipe 3 between the valve 20 and the indoor unit 2 is higher, the refrigerant R does not flow through the outdoor unit side check valve 20 to the outdoor unit 1 side. It flows to the indoor unit 2 side through the unit check valve 19.

  The refrigerant R that has passed through the indoor unit side check valve 19 tends to flow to the branch pipe 25 side, but the pressure in the branch pipe 25 between the branch side check valve 26 and the inlet side pipe 22 is Since the pressure in the branch pipe 25 between the branch side check valve 26 and the liquid side pipe 3 is higher, the refrigerant R does not flow to the branch pipe 25 side but flows to the indoor unit 2 side.

  The refrigerant R evaporated by the indoor side heat exchanger 13 of the indoor unit 2 is returned to the compressor 5 through the gas side pipe 4, the gas side closing valve 11, and the four-way switching valve 6.

  Hereinafter, the above-described steps are repeated. In this way, by cooling the air conditioning system, the cleaning device A incorporated in the liquid side pipe 3 cleans the refrigerant R in the refrigerant circuit of the air conditioning system.

  On the other hand, as shown in FIG. 3, when the cleaning device A is incorporated in the liquid side pipe 3 of the heating / cooling system that is in the heating operation state and the heating / cooling system is heated, the refrigerant that has become high-temperature / high-pressure gas by the compressor 5. R flows into the gas side pipe 4 from the gas side closing valve 11 through the four-way switching valve 6.

  The gaseous refrigerant R that has flowed into the gas side pipe 4 flows into the indoor side heat exchanger 13 of the indoor unit 2 from the gas side pipe 4, where it is condensed by exchanging heat with the indoor air from the indoor fan 14. The room is heated by condensation heat.

  The refrigerant R that has been condensed and liquefied by the indoor heat exchanger 13 is decompressed by the indoor expansion mechanism 15 and then flows into the liquid pipe 3.

  The liquid refrigerant R flowing into the liquid side pipe 3 is provided with an indoor unit side check valve 19 for blocking the flow of the refrigerant R from the indoor unit 2 side to the outdoor unit 1 side in the liquid side pipe 3. Then, it flows into the branch pipe 25 connected to the liquid side pipe 3 in a branched manner.

  The liquid refrigerant R flowing into the branch pipe 25 flows into the inlet side pipe 22 through the branch side check valve 26 that allows the flow to the inlet side pipe 22, and flows into the filter device 21 from the inlet side pipe 22. .

  In addition, the flow of the refrigerant R to the liquid side pipe 3 side is connected to the connection part of the branch pipe 25 and the inlet side pipe 22 and the inlet side pipe 22 between the connection side of the liquid side pipe 3 and the inlet side pipe 22. Since the inlet-side check valve 23 to be blocked is interposed, the refrigerant R that has flowed into the inlet-side pipe 22 from the branch pipe 25 flows to the filter device 21 side.

  In the liquid refrigerant R flowing into the filter device 21, sludge and metal powder contained in the refrigerant R are removed by the filter material 21d, the permanent magnet 21c, and the metal mesh filter 21g.

  The liquid refrigerant R from which the sludge and metal powder have been removed by the filter device 21 flows into the liquid side pipe 3 between the indoor unit side check valve 19 and the outdoor unit side check valve 20 through the outlet side pipe 24. To do.

  The liquid refrigerant R flowing into the liquid side pipe 3 is allowed to flow from the indoor unit 2 side to the outdoor unit 1 side by the outdoor unit side check valve 20 provided in the liquid side pipe 3. Then, it flows into the outdoor unit 1 from the liquid side pipe 3, is decompressed by the outdoor expansion mechanism 9, and then flows into the outdoor heat exchanger 7, where it evaporates by exchanging heat with outdoor air from the outdoor fan 8.

  The refrigerant R flowing into the liquid side pipe 3 between the indoor unit side check valve 19 and the outdoor unit side check valve 20 allows the refrigerant R to flow from the outdoor unit 1 side to the indoor unit 2 side. Although it tries to flow to the indoor unit 2 side through the indoor unit side check valve 19, the pressure in the liquid side pipe 3 between the indoor unit side check valve 19 and the outdoor unit 1 is Since the pressure in the liquid side pipe 3 between the valve 19 and the outdoor unit 1 is higher, the refrigerant R does not flow through the indoor unit check valve 19 to the indoor unit 2 side, It flows to the indoor unit 2 side through the unit-side check valve 20.

  In addition, the refrigerant R that has passed through the indoor unit side check valve 20 tends to flow to the inlet side pipe 22, but the pressure in the inlet side pipe 22 between the inlet side check valve 23 and the filter device 21 is Since the pressure in the inlet side pipe 22 between the inlet side check valve 23 and the liquid side pipe 3 is higher, the refrigerant R does not flow into the inlet side pipe 22 but flows into the outdoor unit 1 side. .

  The refrigerant R evaporated by the outdoor heat exchanger 7 of the outdoor unit 1 is returned to the compressor 5 through the four-way switching valve 6.

  Hereinafter, the above-described steps are repeated. In this manner, by performing the heating operation of the air conditioning system, the cleaning of the refrigerant R in the refrigerant circuit of the air conditioning system is performed by the cleaning device A incorporated in the liquid side pipe 3.

  Thus, in the air conditioning system incorporating the cleaning device A, the flow of the refrigerant R flowing through the filter device 21 of the cleaning device A is the same during the cooling operation and during the heating operation. In addition, the metal powder is not separated or separated by the flow of the refrigerant R, and sludge or metal powder can be prevented from entering the outdoor unit 1 or the indoor unit 2. As a result, the air conditioning system can be operated without impairing the reliability of the air conditioning system.

  Further, in the air conditioning system incorporating the cleaning device A, since the cleaning device A is provided only in the liquid side pipe 3, the strainers 40 and 41 are provided in both the liquid refrigerant pipe 38 and the gas refrigerant pipe 39 as shown in FIG. The cost can be reduced as compared with the conventional air conditioner, and the installation in the air conditioning system does not take time, and the work efficiency can be improved.

  In the above embodiment, the filter device 21 is configured such that the permanent magnet 21c, the filter material 21d, and the metal mesh filter 21g are accommodated in the casing 21a. However, the configuration of the filter device 21 is the same as that of the above embodiment. Of course, any configuration may be used as long as sludge, metal powder, and the like in the refrigerant R can be removed reliably and satisfactorily.

A is cleaning device R is refrigerant 1 is outdoor unit 2 is indoor unit 3 is liquid side piping 4 is gas side piping 19 is indoor unit side check valve 20 is outdoor unit side check valve 21 is filter device 21a is casing 21a ' Is a casing inlet 21a ″ is a casing outlet 21c is a permanent magnet 21d is a filter material 21g is a metal mesh filter 22 is an inlet side pipe 23 is an inlet side check valve 24 is an outlet side pipe 25 is a branch pipe 26 is a branch side reverse Stop valve

Claims (3)

  A cleaning device used in an air conditioning system in which an outdoor unit and an indoor unit are connected by a liquid side pipe and a gas side pipe. The cleaning unit is interposed in the liquid side pipe and allows the refrigerant to flow from the outdoor unit side to the indoor unit side. An indoor unit check valve and an outdoor unit check that is interposed in the liquid side pipe on the outdoor unit side of the indoor unit check valve and allows the refrigerant to flow from the indoor unit side to the outdoor unit side. A valve, a filter device having a refrigerant inlet and outlet, and removing sludge and metal powder contained in the refrigerant; a liquid side pipe on the outdoor unit side relative to the position of the outdoor unit check valve; and a filter device inlet Between the inlet side pipe connecting the inlet side pipe, the inlet side check valve interposed in the inlet side pipe and allowing the refrigerant to flow to the filter device side, and between the indoor unit side check valve and the outdoor unit side check valve The outlet side pipe connecting the liquid side pipe of the filter and the outlet of the filter device Branch pipe connecting the inlet side pipe on the side and the liquid side pipe on the indoor unit side relative to the position of the check valve on the indoor unit, and the branch pipe, allowing refrigerant flow to the inlet side pipe side A cleaning device for an air conditioning system comprising a branch-side check valve.   The filter device includes a casing having an inlet and an outlet for a refrigerant, a permanent magnet that is housed in the casing and removes magnetic metal powder contained in the refrigerant, and a sludge contained in the refrigerant that is contained in the casing. The washing | cleaning apparatus of the air conditioning system of Claim 1 provided with the filter material to perform and the metal mesh filter which removes the sludge which was accommodated in the casing and was not able to be removed with the filter material.   The cleaning device for an air conditioning system according to claim 2, wherein the filter material is a compressed felt filter material, and the metal mesh filter is a 4000 mesh stainless steel mesh filter.

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