JP5926710B2 - Pipeline cleaning method for air conditioning system and pipe cleaning apparatus used therefor - Google Patents

Description

  [Technical Field] The present invention relates to an air conditioning system for business use mainly installed in buildings, factories, etc., a method for cleaning pipes for home air conditioning systems installed in buildings such as private houses and condominiums, and pipes used therefor In particular, after replacing a damaged compressor with a new compressor, the foreign substances in the refrigerant circulating in the refrigerant circuit and the foreign substances contained in the lubricating oil of the compressor are replaced by a new compressor. It can be removed to clean the refrigerant and lubricating oil, preventing damage to the replaced new compressor, reducing the amount of lubricating oil replenished to the compressor and reducing costs. The present invention relates to a pipe cleaning method for an air conditioning system that can be easily and easily connected to an air conditioning system, and a pipe cleaning instrument used therefor.

In general, an air conditioning system that performs indoor air conditioning is an indoor unit including an indoor heat exchanger (condenser or evaporator) and an indoor fan, a compressor, a four-way switching valve, an outdoor heat exchanger (condenser or evaporator). ), An outdoor unit equipped with an outdoor fan and an expansion mechanism (an expansion valve or a capillary tube), etc., is connected by a liquid side pipe and a gas side pipe to form a closed refrigerant circuit, and the refrigerant is supplied in the refrigerant circuit. Indoor air conditioning is performed by circulating and evaporating or condensing.
Further, as the compressor, a gas driven compressor or an electrically driven compressor is used, and lubricating oil is enclosed in these compressors for preventing wear.

  By the way, in the air conditioning system, the lubricating oil of the compressor runs out, the sliding powder of the compressor wears out, foreign matters such as deteriorated lubricating oil, oxide scale, etc., or the refrigerant and lubricating oil. If the refrigerant does not circulate in the refrigerant circuit, the compressor is damaged and the compressor needs to be replaced.

When the compressor of the air conditioning system is broken, foreign matters such as metal powder and fine fragments are scattered in the compressor and the pipe line forming the refrigerant circuit, so that the refrigerant and the lubricating oil are contaminated.
Also, when replacing a damaged compressor, foreign matter such as metal powder may enter the pipe and contaminate the refrigerant and lubricating oil.
If the air conditioning system is operated in this state, even if it is replaced with a new compressor, the foreign matter in the refrigerant or the foreign matter in the lubricating oil will cause damage immediately.

In the air conditioning system, a filter for removing foreign substances in the refrigerant is usually installed in the refrigerant circuit. However, the specifications of this filter are not designed to completely collect the foreign substances.
This is because if the filter specifications are changed so that fine foreign substances can be completely collected, the filter hole diameter becomes smaller and clogging is likely to occur, and the circulation rate of the refrigerant decreases, resulting in reduced cooling and heating capabilities. It is because it falls.

  Therefore, in the conventional cooling and heating system, when the compressor is damaged, the damaged compressor is replaced with a new compressor, and the lubricant and refrigerant remaining in the pipeline are completely removed, and then a new one is added in the pipeline. The refrigerant was filled, and a new lubricating oil was sealed in the compressor.

However, in this case, since the compressor is replaced, there is a problem that the cost is high and the amount of refrigerant and lubricating oil to be used increases, and the cost of the refrigerant and lubricating oil becomes considerably high.
For example, a compressor used in a commercial air-conditioning system costs about 200,000 yen per unit, and lubricating oil costs around 10,000 yen per liter, and the entire system requires several tens of liters. This will lead to cost increases.
In particular, in the air conditioning system provided with the several compressor, the said problem will appear more notably.

  On the other hand, the present applicant has previously developed a cleaning device for an air conditioning system, and disclosed this as Japanese Patent Application Laid-Open No. 2004-177028 (Patent Document 1).

  That is, the cleaning device is not shown in the drawing, but an oil / refrigerant separation / recovery device that extracts dirty lubricating oil in the compressor and separates and recovers the lubricating oil and the refrigerant contained in the lubricating oil, and a new lubrication device. Included in the refrigerant is an oil / refrigerant supply device that supplies oil to the pipe line on the outdoor unit side and returns a part of the refrigerant separated and recovered by the oil / refrigerant separation / recovery unit to the pipe line on the outdoor unit side It consists of a filter device that removes foreign matter, etc., and can separate and collect lubricating oil and refrigerant, supply new lubricating oil, and remove foreign matter contained in the refrigerant while operating the air conditioning system Yes.

  However, since the cleaning device has a large number of parts and a very complicated structure, the cost of the cleaning device itself is high, and it takes time and effort to assemble the cleaning device itself and connect it to the air conditioning system. However, there was a problem that it was extremely bad.

JP 2004-177028 A

  The present invention has been made in view of such problems, and its purpose is to replace a damaged compressor with a new compressor and then circulate in the refrigerant circuit while operating the cooling / heating system. The foreign material contained in the compressor and the foreign material contained in the compressor lubricant can be removed to clean the refrigerant and lubricant, preventing damage to the replaced new compressor, and reducing the amount of lubricant replenished to the compressor. It is possible to provide a method for cleaning a pipe of an air conditioning system and a pipe cleaning instrument used therefor, which can be reduced in cost and can be assembled easily and easily connected to an air conditioning system. is there.

In order to achieve the above object, the invention of claim 1 of the present invention includes an outdoor circuit comprising one or more compressors, an oil separator, a four-way switching valve, an outdoor heat exchanger, an expansion mechanism, and outdoor piping. An outdoor unit, an indoor unit having an indoor circuit composed of an indoor heat exchanger and an indoor pipe, a liquid side pipe that forms a closed refrigerant circuit by connecting the outdoor circuit of the outdoor unit and the indoor circuit of the indoor unit, and And a gas side pipe, and used in an air conditioning system that circulates the refrigerant in the refrigerant circuit and returns the lubricating oil separated from the refrigerant by the oil separator to the compressor through the lubricating oil return pipe. A method for cleaning a pipe line of an air conditioning system after replacing a compressor with a new compressor, wherein the damaged compressor is replaced with a new compressor and foreign substances in the refrigerant liquefied in the liquid side pipe are removed. 1 wash And also, the second cleaner to remove foreign matter in the lubricating oil in the lubricating oil return piping interposed respectively accommodated as the first cleaning tool, the inlet and the tubular casing forming an outlet, in a casing A cylindrical body having one end connected to the upstream pipe and the other end closed and having a large number of through holes in the peripheral wall, and a pair of disk-like permanent magnets fitted to the outer peripheral surfaces of both ends of the cylindrical body And a first magnet filter made of a plurality of disc-shaped filter members disposed between the pair of permanent magnets and fitted on the outer peripheral surface of the cylindrical body, and connected in series to the first magnet filter, with an inlet and an outlet A first filter in which a filter material is housed in a formed casing, and a first magnet filter and a first filter arranged in parallel to be branched into an upstream pipe of the first magnet filter and a downstream pipe of the first filter. A first branch filter in which a filter material is housed in a casing formed with an inlet and an outlet, and an upstream pipe of the first magnet filter and at a position downstream of the connection point of the first branch filter. And a check valve that allows flow to the first magnet filter side, and a branch pipe of the first branch filter connected to the downstream pipe of the first filter, to the first branch filter side. A first cleaning tool composed of a check valve that allows flow is used, and as the second cleaning tool, a cylindrical casing having an inlet and an outlet, which is housed in a casing, one end of which is an upstream pipe A cylindrical body having a large number of through holes in the peripheral wall with the other end closed, a pair of disk-like permanent magnets fitted on the outer peripheral surfaces of both ends of the cylindrical body, and a pair of permanent magnets The outer peripheral surface of the cylinder A second magnet filter made of a plurality of disc-shaped filter materials fitted in the second filter, and a second filter connected in series to the second magnet filter and containing the filter material in a casing having an inlet and an outlet The air conditioning system is normally operated for a certain period of time using the second cleaning tool, and the foreign matter in the refrigerant and lubricating oil in the refrigerant circuit is removed by the first cleaning tool and the second cleaning tool, and then the first cleaning tool and The second cleaning tool is characterized by being removed from the liquid side pipe 3 and the lubricant return pipe, respectively.

The invention according to claim 2 of the present invention includes an outdoor unit including an outdoor circuit including one or a plurality of compressors, an oil separator, a four-way switching valve, an outdoor heat exchanger, an expansion mechanism, and an outdoor pipe, and an indoor heat exchange. An indoor unit having an indoor circuit composed of a vessel and an indoor pipe, and a liquid side pipe and a gas side pipe that form a closed refrigerant circuit by connecting the outdoor circuit of the outdoor unit and the indoor circuit of the indoor unit, A pipe cleaning device for use in a pipe cleaning method for an air conditioning system in which the refrigerant is circulated in the refrigerant circuit and the lubricating oil separated from the refrigerant by an oil separator is returned to the compressor by a lubricating oil return pipe. The pipe cleaning device is provided in the liquid side pipe and removes the foreign matter in the liquefied refrigerant, and the second cleaning tool is provided in the lubricating oil return pipe and removes the foreign matter in the lubricating oil. A first cleaning device comprising: a cleaning tool; The tool is a cylindrical casing having an inlet and an outlet, and is housed in the casing, one end of which is connected to the upstream pipe, the other end is closed, and the peripheral wall has a large number of through holes, A first magnet comprising a pair of disk-like permanent magnets fitted to the outer peripheral surfaces of both ends of the cylindrical body, and a plurality of disk-shaped filter members disposed between the pair of permanent magnets and fitted to the outer peripheral surface of the cylindrical body A filter, a first filter connected in series to the first magnet filter, and containing a filter material in a casing having an inlet and an outlet, and a first filter disposed in parallel with the first magnet filter and the first filter. A first branch filter which is connected to the upstream pipe of the magnet filter and the downstream pipe of the first filter via a branch pipe, and in which a filter material is housed in a casing having an inlet and an outlet; A check valve that is located upstream of the Gnett filter and downstream of the connection point of the first branch filter, and allows a flow toward the first magnet filter, and a downstream pipe of the first filter A check valve interposed in the branch pipe of the connected first branch filter and allowing flow to the first branch filter side, and the second cleaning tool is a cylinder in which an inlet and an outlet are formed. A cylindrical casing, a cylindrical body having one end connected to the upstream pipe, the other end closed and a large number of through holes in the peripheral wall, and fitted to the outer peripheral surfaces of both ends of the cylindrical body. A second magnet filter comprising a plurality of felt disk-shaped filter members disposed between a pair of disc-shaped permanent magnets and a pair of permanent magnets, and fitted on the outer peripheral surface of the cylindrical body; Connected in series Is, there is a particular feature and a second filter housing the filter material in a casing to form an inlet and an outlet.

  The method for cleaning a pipe of an air conditioning system according to the present invention replaces a damaged compressor with a new compressor, and removes a foreign substance in the refrigerant liquefied in the liquid side pipe of the air conditioning system. A second cleaning tool for removing foreign matters in the lubricating oil is provided in the lubricating oil return pipe of the system, and in this state, the air conditioning system is normally operated for a certain period of time, so that the foreign matters in the refrigerant in the refrigerant circuit and the lubricating oil Since foreign substances are removed by the first cleaning tool and the second cleaning tool, respectively, since the refrigerant and the lubricating oil are cleaned during operation, it is possible to prevent the newly replaced compressor from being damaged.

In addition, the pipe cleaning method for an air conditioning system according to the present invention is a new method because the refrigerant and lubricating oil remaining in the pipe are cleaned by the first cleaning tool and the second cleaning tool after replacing the compressor. The amount of refrigerant and lubricating oil to be replenished can be reduced, and the cost can be reduced.
For example, when the pipe cleaning method for an air conditioning system of the present invention is used, in an air conditioning system that requires 30 liters of lubricating oil, only about 6 liters of lubricating oil (about 1/6) need be replenished.

  Furthermore, the pipe cleaning method for an air conditioning system according to the present invention uses a first cleaning tool and a second cleaning tool having a relatively simple structure, the first cleaning tool is used as a liquid side pipe, and the second cleaning tool is used. Since the inside of the pipe line can be cleaned simply by interposing each of the oil return pipes, the cost can be reduced as compared with the conventional cleaning apparatus, and the pipe cleaning equipment itself can be assembled and used in an air conditioning system. Connections can be made easily and easily, and work efficiency can be improved.

  In addition, the pipe cleaning method for an air conditioning system according to the present invention includes, as a first cleaning tool, a first magnet filter, a first filter connected in series to the first magnet filter, a first magnet filter, and a first magnet filter. A first branch filter arranged in parallel with the filter and connected to the upstream pipe of the first magnet filter and the downstream pipe of the first filter via a connection pipe; the upstream pipe of the first magnet filter; A check valve that is interposed downstream of the connection point of the one-branch filter and allows the flow to the first magnet filter side, and a connection of the first branch filter connected to the downstream pipe of the first filter Since the first cleaning tool that is interposed in the pipe and includes a check valve that allows the flow to the first branch filter side is used, even if the air conditioning system is in a cooling operation or a heating operation, The phased refrigerant while washing the first cleaner also can flow in any of the indoor unit side or the outdoor unit side, can be removed reliably and favorably foreign matter in the refrigerant.

  The pipe cleaning instrument of the present invention can suitably carry out the pipe cleaning method of the air conditioning system described above.

  In the pipe cleaning instrument of the present invention, the first cleaning tool connects the first magnet filter and the first filter in series, and the second cleaning tool connects the second magnet filter and the second filter in series. Since they are connected, foreign matters in the liquefied refrigerant and foreign matters in the lubricating oil can be reliably and satisfactorily removed.

  Further, in the pipe cleaning instrument of the present invention, the first cleaning tool arranges the first branch filter in parallel with the first magnet filter and the first filter connected in series, and both ends of the first branch filter. Are connected to the upstream piping of the first magnet filter and the downstream piping of the first filter through the connecting piping, respectively, and the check valve is connected to the upstream piping of the first magnet filter and the upstream connecting piping of the first branch filter. Therefore, even if the air conditioning system is in the cooling operation or the heating operation, the liquefied refrigerant can be flowed to either the indoor unit side or the outdoor unit side while washing with the first cleaning tool, Foreign matter in the refrigerant can be removed reliably and satisfactorily.

It is a schematic system diagram at the time of the air_conditionaing | cooling operation | movement of the conventionally well-known air conditioning system incorporating the pipe line washing instrument which concerns on embodiment of this invention. The pipe line washing | cleaning instrument which concerns on embodiment of this invention is shown, (A) is the schematic of a 1st cleaning tool, (B) is the schematic of a 2nd cleaning tool. It is a schematic sectional drawing of the 1st magnet filter and 2nd magnet filter which are used for the 1st cleaning tool and the 2nd cleaning tool. It is a schematic system diagram at the time of the heating operation of the conventionally well-known air conditioning system incorporating the pipe line washing instrument which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a schematic system diagram during cooling operation of an air conditioning system incorporating a pipe cleaning device according to an embodiment of the present invention. The air conditioning system includes an outdoor circuit of an outdoor unit 1 and an indoor unit 2. An indoor circuit is connected by a liquid side pipe 3 and a gas side pipe 4 to form a closed refrigerant circuit, and a refrigerant R (for example, an HFC type refrigerant R) is enclosed in the refrigerant circuit, and the refrigerant R is used as a refrigerant. The room is circulated in the circuit to evaporate or condense, thereby cooling and heating the room.

Specifically, as shown in FIG. 1, the outdoor circuit of the outdoor unit 1 includes two compressors 5 arranged in parallel, an oil separator 6, a four-way switching valve 7, and an outdoor heat exchanger arranged in parallel. 8, the receiver tank 9 and the expansion mechanism 10 (in this embodiment, an electronic expansion valve) and the like are sequentially connected by an outdoor pipe 11.
The outdoor unit 1 includes a lubricating oil return pipe 12 that returns the lubricating oil O separated from the refrigerant R by the oil separator 6 to the compressor 5, an outdoor fan 13 that sends outdoor air to the outdoor heat exchanger 8, and a liquid side A liquid-side shut-off valve 14 to which one end of the pipe 3 is connected, a gas-side shut-off valve 15 to which one end of the gas-side pipe 4 is connected, a pipe 16 that forms a liquid injection circuit, and the like are provided.

On the other hand, the indoor circuit of the indoor unit 2 is configured by connecting an indoor heat exchanger 17 and an indoor electronic expansion valve 18 through an indoor pipe 19 as shown in FIG.
The indoor unit 2 includes an indoor fan 20 that sends room air to the indoor heat exchanger 17, a liquid side end 21 to which the other end of the liquid side pipe 3 is connected, and the other end of the gas side pipe 4. A gas side end portion 22 and the like to be connected are provided.

  And the liquid side closing valve 14 of the outdoor unit 1 and the liquid side end 21 of the indoor unit 2 are connected by the liquid side pipe 3, and the gas side closing valve 15 of the outdoor unit 1 and the gas side of the indoor unit 2 A closed refrigerant circuit is formed by connecting the end 22 with the gas side pipe 4.

In the cooling / heating system, the four-way switching valve 7 is switched to allow the refrigerant R discharged from the compressor 5 to flow from the outdoor heat exchanger 8 (condenser) to the indoor heat exchanger 17 (evaporator). (Refer to FIG. 1), and the refrigerant R discharged from the compressor 5 is caused to flow from the indoor heat exchanger 17 (condenser) to the outdoor heat exchanger 8 (evaporator) by switching the four-way switching valve 7. Thus, the heating operation (see FIG. 4) is performed.

That is, when the four-way switching valve 7 is switched to the cooling operation, the refrigerant R discharged from the compressor 5 of the outdoor unit 1 passes through the oil separator 6 and the four-way switching valve 7 as shown in FIG. In this case, it is condensed and liquefied by exchanging heat with outdoor air, and flows into the indoor unit 2 through the receiver tank 9, the expansion mechanism 10, the liquid side shut-off valve 14, and the liquid side pipe 3, and After being depressurized, it flows into the indoor heat exchanger 17, where it exchanges heat with room air and evaporates to cool the room.
The refrigerant R flowing out from the indoor heat exchanger 17 of the indoor unit 2 is returned to the compressor 5 of the outdoor unit 1 through the gas side pipe 4, the gas side closing valve 15, and the four-way switching valve 7.

On the other hand, when the four-way switching valve 7 is switched to the heating operation, as shown in FIG. 4, the refrigerant R discharged from the compressor 5 of the outdoor unit 1 is sent to the oil separator 6, the four-way switching valve 7, the gas side closing valve 15, The gas reaches the indoor heat exchanger 17 of the indoor unit 2 through the gas side pipe 4, where heat is exchanged with indoor air to condense and heat the room.
The refrigerant R condensed in the indoor heat exchanger 17 flows into the outdoor unit 1 through the indoor electronic expansion valve 18, the liquid side pipe 3, and the liquid side shut-off valve 14, and then passes through the receiver tank 9 and the expansion mechanism 10 to the outdoor heat. After flowing into the exchanger 8 and evaporating by exchanging heat with outdoor air, it is returned to the compressor 5 of the outdoor unit 1 through the four-way switching valve 7.

  In addition, when the cooling / heating system is in a cooling operation or a heating operation, the refrigerant R discharged from the compressor 5 passes through the oil separator 6 as described above. The contained lubricating oil O is separated and returned to the compressor 5 by the lubricating oil return pipe 12.

  In FIGS. 1 and 4, 23 is a check valve, 24 is an outdoor electronic expansion valve, 25 is a waste heat recovery device, and 26 is a solenoid valve.

  And the pipe line washing instrument which concerns on embodiment of this invention is used when wash | cleaning the pipe line (refrigerant circuit) of an air conditioning system, when the damaged compressor 5 is replaced | exchanged for the new compressor 5. FIG. The first cleaning tool 27 that is disposed in the liquid side pipe 3 and removes the foreign matter in the liquefied refrigerant R, and the lubricating oil return pipe 12 in the vicinity of the two compressors 5 arranged in parallel, are respectively disposed. And two second cleaning tools 28 for removing foreign substances in the lubricating oil O.

  That is, as shown in FIG. 2A, the first cleaning tool 27 connects the first magnet filter 29, the first filter 30, the first branch filter 31, and the two check valves 32 to the upstream pipe 33. The pipe 34, the downstream pipe 35 and the branch pipe 36 are connected in series and in parallel to form a unit. During the cooling operation of the air conditioning system, the liquefied refrigerant R is changed from the first magnet filter 29 to the first filter 30. The foreign matter in the refrigerant R is removed by the first magnet filter 29 and the first filter 30, and the liquefied refrigerant R passes through the first branch filter 31 during the heating operation of the air conditioning system. The foreign matter is configured to be removed by the first branch filter 31.

Specifically, as shown in FIG. 3, the first magnet filter 29 is accommodated in a cylindrical casing 29a having an inlet and an outlet, and the casing 29a, and one end thereof is inserted into the casing 29a in an airtight manner. A cylindrical body 29b which is connected to the upstream pipe 33 and whose other end is closed and has a large number of through-holes 29b 'in the peripheral wall, and a pair of disk-shaped permanent members fitted respectively to the outer peripheral surfaces of both ends of the cylindrical body 29b. A plurality of felt disk-shaped filter materials 29d disposed between the magnet 29c and the pair of permanent magnets 29c and fitted on the outer peripheral surface of the cylinder 29b, and bolts 29e on the other end face of the cylinder 29b. The refrigerated refrigerant R flows into the cylinder 29b from the upstream side pipe 33 and is formed through the through holes 29b of the cylinder 29b. And after having flowed into the space between the casing 29a and the permanent magnets 29c and the filter material 29d via the filter member 29d, and then flows out from the outlet of the casing 29a.
In the first magnet filter 29, when the refrigerant R passes through the filter material 29d, the foreign material in the refrigerant R is removed by the filter material 29d, and the foreign material having magnetism that has not been removed by the filter material 29d is a permanent magnet. 29c to remove.

Further, as shown in FIG. 2, the first filter 30 is configured such that a filter material 30 b is accommodated in a cylindrical casing 30 a in which an inlet and an outlet are formed, and the inlet of the casing 30 a is a casing 29 a of the first magnet filter 29. And a downstream pipe 35 is connected to the outlet of the casing 30a.
As the filter material 30b of the first filter 30, a filter material 30b capable of removing minute foreign matters having a level of 2 μm to 5 μm is used. In this embodiment, a high-purity metal filter (trade name: stainless steel pleated compact cartridge filter) obtained by sintering high-purity stainless steel fibers and pleating them is used as the filter material 30b.

Further, as shown in FIG. 2, the first branch filter 31 is one in which a filter material 31 b is accommodated in a cylindrical casing 31 a in which an inlet and an outlet are formed, and the inlet of the casing 31 a is upstream via a branch pipe 36. While being connected to the side pipe 33, the outlet of the casing 31 a is connected to the downstream side pipe 35 via the branch pipe 36.
As the filter material 31b of the first branch filter 31, a filter material 31b capable of removing fine foreign matters of 2 μm to 5 μm level is used. In this embodiment, a metal filter (trade name: stainless steel pleated compact cartridge filter) having a high filtration area obtained by sintering and pleating high purity stainless steel fibers is used for the filter material 31b.

Of the two check valves 32, one check valve 32 is interposed on the upstream pipe 33 of the first magnet filter 29 and at a position downstream of the connection location of the first branch filter 31. The flow from the upstream side pipe 33 to the first magnet filter 29 side is allowed, and the flow in the opposite direction is prevented.
The other check valve 32 is interposed in the branch pipe 36 of the first branch filter 31 connected to the downstream pipe 35 of the first filter 30, and the first branch filter 31 side from the downstream pipe 35. Is allowed to flow in the opposite direction and is prevented from flowing in the opposite direction.

  As shown in FIG. 2 (B), the two second cleaning tools 28 are obtained by connecting a second magnet filter 37 and a second filter 38 in series by a connecting pipe 34 to form a unit. In the cooling operation and the heating operation, the lubricating oil O flows from the second magnet filter 37 to the second filter 38, and foreign matters in the lubricating oil O are removed by the second magnet filter 37 and the second filter 38. Has been.

The second magnet filter 37 has the same shape and the same structure as the first magnet filter 29, and the second filter 38 has the same shape and the same structure as the first filter 30. Detailed description is omitted.
An upstream pipe 33 is connected to the inlet of the casing 37 a of the second magnet filter 37, and a downstream pipe 35 is connected to the outlet of the casing 38 a of the second filter 38.

In FIG. 2, reference numeral 39 denotes a pressure gauge provided in each of the upstream side pipe 33 and the downstream side pipe 35.
3, 37 is a second magnet filter, 37a is a casing, 37b is a cylinder, 37b 'is a through hole, 37c is a permanent magnet, 37d is a filter material, 37e is a bolt, 37f is a retaining disc, 38 is a second filter, 38a is a casing, and 38b is a filter material.

  Next, after replacing the damaged compressor 5 of the cooling / heating system using the above-described pipe cleaning device, cleaning of the refrigerant R remaining in the refrigerant circuit of the cooling / heating system and cleaning of the lubricating oil O will be described. To do.

  First, the damaged compressor 5 of the cooling / heating system is replaced with a new compressor 5, and the first cleaning tool 27 is interposed in the liquid side piping 3 of the cooling / heating system, and the upstream piping 33 and the downstream of the first cleaning tool 27. The side pipes 35 are connected to the liquid side pipes 3 by flange joints (not shown) or the like, and the second cleaning tools 28 are respectively provided in the lubricating oil return pipes 12 located upstream of the two compressors 5. Then, the upstream piping 33 and the downstream piping 35 of each second cleaning tool 28 are connected to the lubricating oil return piping 12 by flange joints (not shown) or the like.

  Next, in this state, the air conditioning system is normally operated for a certain period of time (about 1 to 2 days), the foreign matter in the refrigerant R is removed by the first cleaning tool 27, and the foreign matter in the lubricating oil O is removed by the second cleaning tool 28. To remove each.

  For example, in the case of an air conditioning system that is in a cooling operation, the refrigerant R that has become a high-temperature and high-pressure gas by the compressor 5 is separated from the lubricating oil O contained in the refrigerant R via the oil separator 6. Then, it flows into the outdoor heat exchanger 8 through the four-way switching valve 7, where it becomes a high-temperature / high-pressure liquid, and flows into the first cleaning tool 27 through the receiver tank 9 as a low-temperature / low-pressure liquid by the expansion mechanism 10. Go.

  The liquefied refrigerant R that has flowed into the first cleaning tool 27 passes through the first magnet filter 29 and the first filter 30, and during that time the foreign matter contained in the refrigerant R (the abrasion powder of the sliding material of the compressor 5). , Metal powder, fine debris, deteriorated lubricant O, oxide scale, etc.) are sequentially removed.

  The refrigerant R that has passed through the first cleaning tool 27 enters the indoor heat exchanger 17 through the indoor electronic expansion valve 18, becomes low-temperature / low-pressure gas, and then enters the compressor 5 through the four-way switching valve 7. The above-described steps are repeated.

The lubricating oil O separated by the oil separator 6 flows into the second cleaning tool 28 through the lubricating oil return pipe 12, passes through the second magnet filter 37 and the second filter 38, and in the meantime, into the lubricating oil O. The contained foreign matter (abrasion powder of the sliding material of the compressor 5, metal powder, fine debris, deteriorated lubricant O, oxide scale, etc.) is removed in sequence, and then returned to the compressor 5.
The new refrigerant R and lubricating oil O are replenished during the operation of the air conditioning system.

  On the other hand, in the case of a heating / cooling system that is in a heating operation, the refrigerant R that has become a high-temperature and high-pressure gas by the compressor 5 is separated from the lubricating oil O contained in the refrigerant R through the oil separator 6. After that, it flows into the indoor heat exchanger 17 through the four-way switching valve 7, where it becomes a high-temperature / high-pressure liquid, and becomes a low-temperature / low-pressure liquid by the indoor electronic expansion valve 18 and flows into the first cleaning tool 27. go.

  The liquefied refrigerant R that has flowed into the first cleaning tool 27 passes through the first branch filter 31, and in the meantime, foreign substances contained in the refrigerant R (abrasion powder, metal powder, fine powder of sliding material of the compressor 5). Such as debris, deteriorated lubricant O, and oxide scale).

The refrigerant R that has passed through the first cleaning tool 27 enters the outdoor heat exchanger 8 through the receiver tank 9 and the expansion mechanism 10, becomes a low-temperature / low-pressure gas here, and then passes through the four-way switching valve 7 to the compressor 5. And the process described above is repeated.

The lubricating oil O separated by the oil separator 6 flows into the second cleaning tool 28 through the lubricating oil return pipe 12, passes through the second magnet filter 37 and the second filter 38, and in the meantime, into the lubricating oil O. The contained foreign matter (abrasion powder of the sliding material of the compressor 5, metal powder, fine debris, deteriorated lubricant O, oxide scale, etc.) is removed in sequence, and then returned to the compressor 5.
The new refrigerant R and lubricating oil O are replenished during the operation of the air conditioning system.

  After the cooling operation or heating operation of the air conditioning system is performed for a certain period of time to remove foreign matters in the refrigerant R and the lubricating oil O, the first cleaning tool 27 and the second cleaning tool 28 are connected to the liquid side pipe 3 and the lubricating oil return pipe. Remove from 12 respectively.

  Thus, the above-described pipe cleaning method for an air conditioning system using the pipe cleaning apparatus normally operates the air conditioning system for a certain period of time to remove foreign matters in the refrigerant R in the refrigerant circuit by the first cleaning tool 27, and Since the foreign matters in the lubricating oil O are respectively removed by the second cleaning tool 28, the zero-fold R and the lubricating oil O are cleaned, and damage to the newly replaced compressor 5 can be prevented.

Further, in the pipe line cleaning method of this air conditioning system, after the compressor 5 is replaced, the refrigerant R and the lubricating oil O remaining in the pipe line are cleaned by the first cleaning tool 27 and the second cleaning tool 28. Therefore, the amount of refrigerant R and lubricating oil O to be newly replenished can be reduced, and the cost can be reduced.
For example, when the pipe cleaning method for an air conditioning system according to the present invention is used, in an air conditioning system that requires 30 liters of lubricating oil O, only about 6 liters (about 1/6) of lubricating oil O need be replenished. .

In the above embodiment, two compressors 5 of the outdoor unit 1 are used. However, in another embodiment, one compressor 5 may be used.
In the above embodiment, one indoor unit 2 is used. However, in other embodiments, a plurality of indoor units 2 may be used.

  1 is an outdoor unit, 2 is an indoor unit, 3 is a liquid side pipe, 4 is a gas side pipe, 5 is a compressor, 6 is an oil separator, 7 is a four-way selector valve, 8 is an outdoor heat exchanger, 9 is a receiver tank, 10 is an expansion mechanism, 11 is an outdoor pipe, 12 is a lubricating oil return pipe, 13 is an outdoor fan, 14 is a liquid side shutoff valve, 15 is a gas side shutoff valve, 16 is a pipe constituting a liquid injection circuit, and 17 is room heat. Exchanger, 18 indoor electronic expansion valve, 19 indoor piping, 20 indoor fan, 21 liquid side end, 22 gas side end, 23 check valve, 24 outdoor electronic expansion valve, 25 waste Heat recovery device, 26 is a solenoid valve, 27 is a first cleaning tool, 28 is a second cleaning tool, 29 is a first magnet filter, 29a is a casing, 29b is a cylinder, 29b 'is a through hole, 29c is a permanent magnet, 29d is filter material, 29e is bolt, 29f is retaining Disc, 30 is first filter, 30a is casing, 30b is filter material, 31 is first branch filter, 31a is casing, 31b is filter material, 32 is a check valve, 33 is upstream piping, and 34 is connection piping , 35 is a downstream pipe, 36 is a branch pipe, 37 is a second magnet filter, 37a is a casing, 37b is a cylinder, 37b 'through hole, 37c is a permanent magnet, 37d is a filter material, 37e is a bolt, and 37f is pulled out A stop disk, 38 is a second filter, 38a is a casing, 38b is a filter material, and 39 is a pressure gauge.

Claims (2)

An outdoor circuit comprising one or a plurality of compressors (5), an oil separator (6), a four-way switching valve (7), an outdoor heat exchanger (8), an expansion mechanism (10) and an outdoor pipe (11) is provided. An outdoor unit (1), an indoor unit (2) having an indoor circuit composed of an indoor heat exchanger (17) and an indoor pipe (19), an outdoor circuit of the outdoor unit (1), and an indoor unit (2) It has a liquid side pipe (3) and a gas side pipe (4) that form a closed refrigerant circuit by connecting an indoor circuit, and circulates the refrigerant (R) in the refrigerant circuit and an oil separator (6 ) Is used in an air conditioning system in which the lubricating oil (O) separated from the refrigerant (R) is returned to the compressor (5) by the lubricating oil return pipe (12), and the damaged compressor (5) is newly compressed. This is a method of cleaning a pipe of an air conditioning system after replacing the machine (5). The first cleaning tool (27) for replacing the compressor (5) with a new compressor (5) and removing foreign matter in the liquefied refrigerant (R) in the liquid side pipe (3) is also provided in the lubrication. The oil return pipe (12) is provided with a second cleaning tool (28) for removing foreign substances in the lubricating oil (O), and the first cleaning tool (27) has a cylindrical shape having an inlet and an outlet. Casing (29a), cylindrical body housed in casing (29a) and having one end connected to upstream pipe (33) and the other end closed and a large number of through holes (29b ') in the peripheral wall (29b), an outer peripheral surface of the cylindrical body (29b) disposed between a pair of disk-shaped permanent magnets (29c) and a pair of permanent magnets (29c) respectively fitted to the outer peripheral surfaces of both ends of the cylindrical body (29b) A first magnet plate comprising a plurality of disc-shaped filter materials (29d) fitted in A first filter (30) which is connected in series to a filter (29) and a first magnet filter (29), and in which a filter material (30b) is housed in a casing (30a) having an inlet and an outlet; A branch pipe arranged in parallel with the magnet filter (29) and the first filter (30) and connected to the upstream pipe (33) of the first magnet filter (29) and the downstream pipe (35) of the first filter (30). A first branch filter (31) in which a filter material (31b) is housed in a casing (31a) connected via (36) and forming an inlet and an outlet, and an upstream pipe ( 33) and a check valve (32) interposed at a position downstream of the connection point of the first branch filter (31) and allowing flow to the first magnet filter (29) side, A check valve interposed in the branch pipe (36) of the first branch filter (31) connected to the downstream pipe (35) of the filter (30) and allowing a flow toward the first branch filter (31). (32) is used, and a cylindrical casing (37a) in which an inlet and an outlet are formed is housed in the casing (37a) as the second cleaning tool (28). The cylinder (37b) having one end connected to the upstream pipe (33) and the other end closed and having a large number of through holes (37b ') on the peripheral wall, both ends of the cylinder (37b) A plurality of disc-shaped filter materials (fitted between a pair of disk-shaped permanent magnets (37c) and a pair of permanent magnets (37c) fitted on the outer peripheral surface and fitted on the outer peripheral surface of the cylindrical body (37b) ( 37d), a second magnet filter (37) and a second A second cleaning tool (28) comprising a second filter (38) which is connected in series to the Gnett filter (37) and houses a filter material (38b) in a casing (38a) having an inlet and an outlet. After using the air conditioner system for a certain period of time and removing foreign substances in the refrigerant (R) and the lubricating oil (O) in the refrigerant circuit by the first cleaning tool (27) and the second cleaning tool (28), A pipe cleaning method for an air conditioning system, wherein the first cleaning tool (27) and the second cleaning tool (28) are removed from the liquid side pipe 3 and the lubricant return pipe (12), respectively. An outdoor circuit comprising one or a plurality of compressors (5), an oil separator (6), a four-way switching valve (7), an outdoor heat exchanger (8), an expansion mechanism (10) and an outdoor pipe (11) is provided. An outdoor unit (1), an indoor unit (2) having an indoor circuit composed of an indoor heat exchanger (17) and an indoor pipe (19), an outdoor circuit of the outdoor unit (1), and an indoor unit (2) It has a liquid side pipe (3) and a gas side pipe (4) that form a closed refrigerant circuit by connecting an indoor circuit, and circulates the refrigerant (R) in the refrigerant circuit and an oil separator (6 The pipe cleaning device used in the pipe cleaning method of the cooling and heating system in which the lubricating oil (O) separated from the refrigerant (R) is returned to the compressor (5) by the lubricating oil return pipe (12). The pipe cleaning device is interposed in the liquid side pipe (3), and is in the liquefied refrigerant (R). First cleaner for removing an object (27), is interposed in a lubricating oil return pipe (12) is constructed from a second cleaner for removing foreign matter in the lubricating oil (O) and (28), said first 1 cleaning tool (27) is accommodated in a cylindrical casing (29a) and casing (29a) having an inlet and an outlet, one end is connected to the upstream pipe (33) and the other end is A cylinder (29b) that is closed and has a large number of through holes (29b ') on the peripheral wall, a pair of disk-like permanent magnets (29c) and a pair of permanent magnets respectively fitted to the outer peripheral surfaces of both ends of the cylinder (29b) A first magnet filter (29) composed of a plurality of disc-shaped filter materials (29d) disposed between (29c) and fitted on the outer peripheral surface of the cylindrical body (29b); and a first magnet filter (29) Caseins connected in series to form inlet and outlet The first filter (30) in which the filter material (30b) is housed in (30a), the first magnet filter (29), and the first filter (30) arranged in parallel to each other, The filter material (31b) is connected to the upstream pipe (33) and the downstream pipe (35) of the first filter (30) via the branch pipe (36), and the casing (31a) is formed with an inlet and an outlet. The first branch filter (31) housed and the upstream pipe (33) of the first magnet filter (29) are interposed at a position downstream of the connection point of the first branch filter (31). A check valve (32) allowing flow to the magnet filter (29) side, and a branch pipe (36) of the first branch filter (31) connected to the downstream pipe (35) of the first filter (30). Intervened in And a check valve (32) that allows flow to the first branch filter (31) side, and the second cleaning tool (28) is a cylindrical casing (inlet and outlet formed) 37a), a cylindrical body (37b) housed in a casing (37a), one end of which is connected to the upstream pipe (33) and the other end is closed to have a large number of through holes (37b ') in the peripheral wall. ) And a pair of disk-like permanent magnets (37c) and a pair of permanent magnets (37c) respectively fitted to the outer peripheral surfaces of both ends of the cylindrical body (37b), and are fitted to the outer peripheral surface of the cylindrical body (37b). A second magnetic filter (37) made of a plurality of felt disc-shaped filter materials (37d) and a casing (38a) connected in series to the second magnet filter (37) and forming an inlet and an outlet Filter material (38b) inside Conduit cleaning implement, characterized in that it is constituted from a second filter which is housed (38).

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