JP5963654B2 - Cleaning device for plate heat exchanger of air conditioner - Google Patents

Description

  The present invention relates to an air conditioner that performs heat exchange between a refrigerant flowing through a refrigerant circulation circuit on the heat source side and water flowing through a water circulation circuit on the load side via a plate heat exchanger. The present invention relates to a cleaning device that can facilitate cleaning of a vessel.

Conventionally, an air conditioner that performs air exchange in a building by exchanging heat between the refrigerant flowing through the refrigerant circulation circuit on the heat source side and the water flowing through the water circulation circuit on the load side via the plate heat exchanger Is known (see, for example, Patent Document 1).
By the way, in a water circulation circuit using a plate heat exchanger, scale and dirt adhere to the plate heat exchanger depending on the period of use. If this is left unattended, pipe clogging will occur, so it is necessary to periodically clean the plate heat exchanger. Cleaning in the plate heat exchanger is performed by flowing cleaning water through the water circulation circuit. However, since the scale is hard and difficult to peel off, the cleaning water is used in the same direction as the water flow during water circulation circuit operation. It is necessary to carry out backwashing in the opposite direction as well as washing in the reverse direction. In the past, this was done by manually switching off the water flow in the water circulation circuit with a valve and connecting the washing water tank and the washing water pump to the plate heat exchanger side. The plate heat exchanger was cleaned. When backwashing, the wash water tank and wash water pump are manually connected to the plate heat exchanger side to form a wash water reverse circulation circuit, and the plate heat exchanger is backwashed. Had gone.

Japanese Patent No. 3858354 (FIG. 8, paragraphs [0021] to [0034])

  As described above, conventionally, the construction of the washing water circulation circuit and the washing water reverse circulation circuit for washing the plate heat exchanger has been manually performed. Further, when the backwashing is completed, it is necessary to remove the washing water tank and the washing water pump from the water circulation circuit and restore the water circulation circuit during normal operation of the air conditioner, and there is a problem that these series of operations are troublesome.

  The present invention has been made to solve the above-described problems, and an object thereof is to facilitate cleaning of a plate heat exchanger of an air conditioner.

  The plate type heat exchanger cleaning device for an air conditioner according to the present invention includes a refrigerant flowing through a refrigerant circuit on the heat source side via a heat source side heat exchange unit and a load side heat exchange unit of the plate type heat exchanger. In an air conditioner that performs heat exchange with water flowing through a water circulation circuit on the load side and performs air conditioning in the building, the water circulation circuit includes a load side heat exchange unit and an indoor heat exchanger, The heat exchanger and the load-side heat exchange unit are connected by a unitized cleaning device, water is driven by a water pump, and the load-side heat exchange unit and the indoor heat exchanger are annularly connected via the cleaning device. The unitized cleaning device includes at least a first pipe connecting the one end side of the indoor heat exchanger and the load side heat exchange unit, the other end side of the load side heat exchange unit, and the room. A second pipe connecting the other end of the heat exchanger, and a first pipe A bypass pipe connected between the two pipes, a first motor-operated valve provided between the water pump and the bypass pipe in the first pipe, and an indoor heat exchanger in the second pipe And a wash water tank and wash water pump provided between the third and fourth motor-operated valves in the bypass pipe, and a wash in the bypass pipe A third motor-operated valve provided between the water pump and the connection portion of the first pipe, and a fourth motor-operated valve provided between the cleaning water tank in the bypass pipe and the connection portion of the second pipe And a control system for controlling the flow direction of the washing water discharged from the washing water pump, and a control means for controlling the first to fourth motor operated valves, the washing water pump, and the washing water flow direction switching means. And the control device includes first and second electric devices. By closing the valve and opening the third and fourth motor-operated valves, the water tank, the washing water pump, and the load-side heat exchange unit are connected by the first pipe, the second pipe, and the bypass pipe. Form a connected wash water circulation circuit, drive the wash water pump to wash the plate heat exchanger, and switch the wash water flow direction switching means to pass through the load side heat exchange section The plate-type heat exchanger is backwashed with the direction of the flow of washing water being reversed.

  According to the plate-type heat exchanger cleaning device for an air conditioner of the present invention, a unitized cleaning device is disposed between the indoor heat exchanger and the pump and the load-side heat exchanger of the plate-type heat exchanger. Since the cleaning device can form not only the water circulation circuit but also the cleaning water circulation circuit, the plate heat exchanger of the air conditioner can be easily cleaned.

It is a figure which shows the washing water circulation circuit of the washing | cleaning apparatus of the plate type heat exchanger of the air conditioner which concerns on Embodiment 1. FIG. It is a figure which shows the washing water circulation circuit of the washing | cleaning apparatus of the plate type heat exchanger of the air conditioner which concerns on Embodiment 2. FIG. It is a figure which shows the washing water circulation circuit of the washing | cleaning apparatus of the plate type heat exchanger of the air conditioner which concerns on Embodiment 3. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1. FIG.
FIG. 1 is a diagram illustrating a cleaning water circulation circuit of a cleaning device for a plate heat exchanger of an air conditioner according to a first embodiment.
As shown in FIG. 1, the air conditioner of Embodiment 1 flows through the refrigerant circulation circuit 20 on the heat source side via the heat source side heat exchange unit 1a and the load side heat exchange unit 1b of the plate heat exchanger 1. Heat exchange is performed between the refrigerant and the water flowing through the water circulation circuit 10 on the load side, thereby air-conditioning the building.

  The water circulation circuit 10 has a drain pipe 15 provided with an on-off valve 14 for draining water in the pipe when the plate heat exchanger 1 is washed, and is restored to the water circulation circuit 10 after washing the plate heat exchanger 1. A faucet 13 is provided for this purpose. Moreover, the water circulation circuit 10 has the water pump 11, the load side heat exchange part 1b, and the indoor heat exchanger 4, and unites between the indoor heat exchanger 4, the water pump 11, and the load side heat exchange part 1b. The water pump 11, the load-side heat exchanging portion 1 b, and the indoor heat exchanger 4 are connected in a ring shape through the cleaning device 31 (a portion surrounded by a broken line). The unitized cleaning device 31 includes at least a first pipe 41 that connects the water pump 11 and the load-side heat exchange unit 1b, and a first pipe 41 that connects the load-side heat exchange unit 1b and the indoor heat exchanger 4. 2 pipe 42 and a bypass pipe 43 connected between the first pipe 41 and the second pipe 42.

  Further, the cleaning device 31 is provided with a first motor-operated valve A between the water pump 11 and the connection portion of the bypass pipe 43 in the first pipe 41. Further, the cleaning device 31 is provided with a second motor-operated valve B between the indoor heat exchanger 4 and the connection portion of the bypass pipe 43 in the second pipe 42. The cleaning device 31 is provided with a cleaning water tank 2 and a cleaning water pump 3 in the middle of the bypass pipe 43. Further, the cleaning device 31 is provided with a third motor-operated valve C between the cleaning water pump 3 and the connection portion of the first piping 41 in the bypass piping 43. The washing water tank 2 is arranged at the lowest position.

  Further, the cleaning device 31 is provided with a fourth motor operated valve D between the cleaning water tank 2 and the connection portion of the second piping 42 in the bypass piping 43. Further, the cleaning device 31 includes a cleaning water flow direction switching means for controlling the flow direction of the cleaning water discharged from the cleaning water pump 3, that is, a bridge circuit 35, and first to fourth electric valves A to D. A control device 21 for controlling the washing water pump 3 is provided.

  The control device 21 closes the first and second motor-operated valves A and B and opens the second and third motor-operated valves C and D, so that the cleaning water tank 2, the cleaning water pump 3, and the load side The heat exchange unit 1 b forms a wash water circulation circuit 51 connected by the first pipe 41, the second pipe 42, and the bypass pipe 43. Further, the control device 21 drives the cleaning water pump 3 to clean the plate heat exchanger 1. Further, the control device 21 switches the bridge circuit 35 so that the plate heat exchanger 1 is backwashed with the direction of the flow of the washing water passing through the load-side heat exchange unit 1b being reversed.

  The bridge circuit 35 includes a fifth motor-operated valve E provided between the connection portion of the bypass piping 43 in the first piping 41 and the load-side heat exchange portion 1b, and the connection of the bypass piping 43 in the second piping 42. And a sixth motor-operated valve F provided between the load-side heat exchange unit 1b. In addition, one end of the bridge circuit 35 is connected between the connection portion of the bypass pipe 43 in the first pipe 41 and the fifth electric valve E, and the sixth electric valve F in the second pipe 42. And a first bypass pipe 44 for a bridge, the other end of which is connected to the load side heat exchange section 1b. One end of the bridge circuit 35 is connected between the connection portion of the bypass pipe 43 in the second pipe 42 and the sixth motor-operated valve F, and the fifth motor-operated valve E in the first pipe 41 is connected. A bridge second bypass pipe 45 having the other end connected between the load and the load side heat exchanging portion 1b is provided. A seventh electric valve G is provided in the middle of the bridge first bypass pipe 44, and an eighth electric valve H is provided in the middle of the bridge second bypass pipe 45.

  Next, operation | movement of the washing | cleaning apparatus of the plate type heat exchanger of the air conditioner which concerns on Embodiment 1 is demonstrated based on FIG. In FIG. 1, black arrows a1 to a7 indicate the flow direction of the wash water (the same direction as the water flow direction during normal operation of the water circulation circuit), and the white arrows b1 to b9 indicate the wash water at the time of backwashing. Shows the flow direction.

  As described above, the water circulation circuit 10 is connected by the cleaning device 31 in which the indoor heat exchanger 4 and the water pump 11 and the load-side heat exchange unit 1b are unitized (portion surrounded by a broken line), The water pump 11, the load-side heat exchange unit 1 b, and the indoor heat exchanger 4 are connected in a ring shape via the cleaning device 31. The cleaning device 31 can form not only the water circulation circuit 10 but also the cleaning water circulation circuit 51. Transition to the cleaning mode of the plate heat exchanger 1 is automatically performed by the control device 21. It is assumed that water in the water circulation circuit 10 is discharged from the on-off valve 14 and the drain pipe 15 and removed prior to cleaning the plate heat exchanger 1.

  The transition to the washing mode in which washing water flows through the plate heat exchanger 1 is performed by first controlling the first and second motor-operated valves A and B and the third and fourth motor-operated valves C and D to be opened. The flow of the washing water to the indoor heat exchanger 4 is shut off. Next, the cleaning water pump 3 is operated to supply the cleaning water from the cleaning water tank 2 to the load side heat exchanging portion 1 b of the plate heat exchanger 1. Then, in the plate heat exchanger 1, the fifth and sixth motor-operated valves E are used when washing water is supplied in the same direction (forward direction) as the water flow direction during normal operation of the water circulation circuit 10. , F are opened, and the seventh and eighth motor-operated valves G, H are controlled to be closed so that the cleaning water flows in the piping in the order of the black arrows a1 to a7. That is, at the time of washing the plate heat exchanger 1, the load-side heat exchange unit 1b is configured so that the wash water flows in the same direction as the water flow direction during normal operation of the water circulation circuit 10. The vessel 1 is cleaned.

  When the plate heat exchanger 1 performs backwashing in which wash water flows in the direction opposite to the direction of water flow during normal operation of the water circulation circuit 10, the first and second motorized valves A and B are used. Is closed, the fifth and sixth motor-operated valves E and F are closed, and the seventh and eighth motor-operated valves G and H are opened while the third and fourth motor-operated valves C and D are open. . Then, the washing water pump 3 is operated so that the washing water flows in the piping in the order of the white arrows b1 to b9. In other words, when the plate heat exchanger 1 is backwashed, the washing water flows in the direction opposite to the flow direction of water during normal operation of the water circulation circuit 10 in the load side heat exchange section 1b of the plate heat exchanger 1. The plate heat exchanger 1 is cleaned so as to flow.

  When the cleaning of the plate heat exchanger 1 is completed, the other third to eighth motor-operated valves C to H are opened while the first and second motor-operated valves A and B are closed, and the cleaning water circulation circuit The cleaning water in 51 is collected in the cleaning water tank 2.

  Thereafter, the third and fourth motor-operated valves C and D are closed, the first and second motor-operated valves A and B are opened, the faucet 13 is opened, the water pump 11 is driven, and the water circulation circuit 10 is opened. When the water is filled, the faucet 13 is closed to restore the original closed circuit water circulation circuit 10. The bridge circuit 35 used to control the flow direction of the cleaning water in the cleaning water circulation circuit 51 can also be used to control the direction of the water flow in the water circulation circuit 10.

  If an air inlet pipe with an on-off valve is provided in the first pipe 41, it becomes easier to drain water from the water circulation circuit 10 and to collect wash water from the wash water circulation circuit 51 to the wash water tank 2.

  Thus, according to the plate type heat exchanger cleaning device for an air conditioner of the present invention, the indoor heat exchanger 4 and the water pump 11 and the load side heat exchange part 1b of the plate type heat exchanger 1 are interposed. The unitized cleaning device 31 is arranged so that not only the water circulation circuit 10 but also the cleaning water circulation circuit 51 can be formed by the cleaning device 31, so that the plate heat exchanger of the air conditioner can be easily cleaned. It can be carried out.

Embodiment 2. FIG.
FIG. 2 is a diagram showing a cleaning water circulation circuit of a cleaning device for a plate heat exchanger of an air conditioner according to a second embodiment, and the same reference numerals are given to the portions corresponding to the first embodiment.
As shown in FIG. 2, the air conditioner of Embodiment 2 is disposed on the discharge side of the washing water pump 3 as washing water flow direction switching means, and the first and second motorized valves are connected to the first electric valve. A four-way valve 5 for switching the discharge flow path of the washing water pump 3 between the pipe 41 and the second pipe 42 is used.

  In the air conditioner of the second embodiment, the forward / reverse circulation pump 12 is used as the water pump of the water circulation circuit 10. The forward / reverse circulation pump 12 has a function as a washing water flow direction switching means. Further, a cleaning water recovery pipe 49 including an on-off valve 48 is provided between the second pipe 42 of the cleaning device 32 that is unitized and the cleaning water tank 2. The cleaning device 32 includes a control device 22 that controls the four-way valve 5, the first to fourth electric valves A to D, the cleaning water pump 3, and the opening / closing valve 48 of the cleaning water recovery pipe 49. It has been. Other configurations are the same as those of the first embodiment.

  Next, operation | movement of the washing | cleaning apparatus of the plate type heat exchanger of the air conditioner which concerns on Embodiment 2 is demonstrated based on FIG. In FIG. 2, black arrows a1 to a10 indicate the flow direction of the wash water (the same direction as the water flow direction during normal operation of the water circulation circuit), and the white arrows b1 to b10 indicate the wash water during backwashing. Shows the flow direction.

  Also in this case, the water circulation circuit 10 is connected to the indoor heat exchanger 4 and the forward / reverse circulation pump 12 and the load side heat exchanging portion 1b by a washing device 32 (part surrounded by a broken line) for washing. The forward / reverse circulation pump 12, the load side heat exchange unit 1 b, and the indoor heat exchanger 4 are connected in a ring shape via the device 32. The cleaning device 32 can form not only the water circulation circuit 10 but also the cleaning water circulation circuit 52. Transition to the cleaning mode of the plate heat exchanger 1 is automatically performed by the control device 22. It is assumed that water in the water circulation circuit 10 is discharged from the on-off valve 14 and the drain pipe 15 and removed prior to cleaning the plate heat exchanger 1.

  The transition to the washing mode in which washing water flows through the plate heat exchanger 1 is performed by first controlling the first and second motor-operated valves A and B and the third and fourth motor-operated valves C and D to be opened. The flow of the washing water to the indoor heat exchanger 4 is shut off. Next, the cleaning water pump 3 is operated to supply the cleaning water from the cleaning water tank 2 to the load side heat exchanging portion 1 b of the plate heat exchanger 1. In addition, in the plate heat exchanger 1, when washing water flows in the same direction (forward direction) as the water flow direction during normal operation of the water circulation circuit 10, the washing water flows through the four-way valve 5. It controls so that it may become the direction of a continuous line, and it is made for washing water to flow through the inside of piping in the order of the black painting arrows a1-a10. That is, at the time of washing the plate heat exchanger 1, the load-side heat exchange unit 1b is configured so that the wash water flows in the same direction as the water flow direction during normal operation of the water circulation circuit 10. The vessel 1 is cleaned.

  When the plate heat exchanger 1 performs backwashing in which wash water flows in the direction opposite to the direction of water flow during normal operation of the water circulation circuit 10, the first and second motorized valves A and B are used. The four-way valve 5 is controlled so that the flow of the washing water is in the direction of the broken line while the third and fourth motorized valves C and D are opened, and the washing water is in the order of the white arrows b1 to b10. To flow through the pipe. In other words, when the plate heat exchanger 1 is backwashed, the washing water flows in the direction opposite to the flow direction of water during normal operation of the water circulation circuit 10 in the load side heat exchange section 1b of the plate heat exchanger 1. The plate heat exchanger 1 is cleaned so as to flow.

  When cleaning of the plate heat exchanger 1 is completed, the first and second motorized valves A and B are closed and the third and fourth motorized valves C and D are opened, and the cleaning water recovery pipe 49 is further opened. The on-off valve 48 is opened, and the wash water in the wash water circulation circuit 52 is collected in the wash water tank 2.

  Thereafter, the third and fourth motor-operated valves C and D and the on-off valve 48 of the washing water recovery pipe 49 are closed, the first and second motor-operated valves A and B are opened, the faucet 13 is opened, and forward and reverse circulation The pump 12 is driven and rotated forward to flow water in the forward direction. When the water circulation circuit 10 is filled with water, the faucet 13 is closed to restore the original closed circuit water circulation circuit 10. When the direction of the water flow in the water circulation circuit 10 is reversed, the forward / reverse circulation pump 12 is rotated in the reverse direction so that the washing water flows in the reverse direction.

  In this case as well, if the first pipe 41 is provided with an air introduction pipe with an opening / closing valve, it becomes easier to drain the water from the water circulation circuit 10 and to collect the washing water from the washing water circulation circuit 52 to the washing water tank 2. .

  Thus, according to the plate type heat exchanger cleaning device for an air conditioner of the present invention, the indoor heat exchanger 4 and the forward / reverse circulation pump 12 and the load side heat exchanger 1b of the plate type heat exchanger 1 are connected. Since the unitized cleaning device 32 is arranged between them, not only the water circulation circuit 10 but also the cleaning water circulation circuit 52 can be formed by the cleaning device 32, so that the plate heat exchanger of the air conditioner can be cleaned. It can be done easily.

Embodiment 3. FIG.
FIG. 3 is a view showing a cleaning water circulation circuit of the cleaning device for the plate heat exchanger of the air conditioner according to the third embodiment, and parts corresponding to the above-described first and second embodiments are denoted by the same reference numerals. It is.
The air conditioner of Embodiment 3 has shown the modification of the bridge circuit used as a washing water flow direction switching means of the washing | cleaning apparatus 33, as shown in FIG.

  The bridge circuit 36 includes a ninth motor-operated valve I provided between the washing water pump 3 and the third motor-operated valve C in the bypass pipe 43, and a connection portion and a load of the bypass pipe 43 in the second pipe 42. And a tenth motor-operated valve J provided between the side heat exchanger 1b. The bridge circuit 36 has one end connected between the third motor-operated valve C and the ninth motor-operated valve I in the bypass pipe 43, and the second motor-operated valve B and the tenth engine in the second pipe 42. A third bypass pipe for bridge 46 having the other end connected to the motor-operated valve J is provided. The bridge circuit 36 has one end connected between the washing water pump 3 and the ninth motor-operated valve I in the bypass pipe 43, and exchanges heat with the tenth motor-operated valve J in the second pipe 42. A bridge fourth bypass pipe 47 having the other end connected to the portion 1b is provided. An eleventh electric valve K is provided in the middle of the bridge third bypass pipe 46, and a twelfth electric valve L is provided in the middle of the bridge fourth bypass pipe 47. Other configurations are the same as those in the first and second embodiments.

Next, operation | movement of the washing | cleaning apparatus of the plate type heat exchanger of the air conditioner which concerns on Embodiment 3 is demonstrated based on FIG. In FIG. 3, black arrows a1 to a10 indicate the flow direction of the wash water (the same direction as the water flow direction during normal operation of the water circulation circuit), and the white arrows b1 to b10 indicate the wash water during backwashing. Shows the flow direction.
Also in this case, the water circulation circuit 10 is connected to the indoor heat exchanger 4 and the forward / reverse circulation pump 12 and the load side heat exchanging portion 1b by a cleaning device 33 (part surrounded by a broken line) for The forward / reverse circulation pump 12, the load-side heat exchange unit 1 b, and the indoor heat exchanger 4 are connected in a ring shape via the device 33. The cleaning device 33 can form not only the water circulation circuit 10 but also the cleaning water circulation circuit 53. Transition to the cleaning mode of the plate heat exchanger 1 is automatically performed by the control device 23. It is assumed that water in the water circulation circuit 10 is discharged from the on-off valve 14 and the drain pipe 15 and removed prior to cleaning the plate heat exchanger 1.

  The transition to the washing mode in which washing water flows through the plate heat exchanger 1 is performed by first controlling the first and second motor-operated valves A and B and the third and fourth motor-operated valves C and D to be opened. The flow of the washing water to the indoor heat exchanger 4 is shut off. Next, the cleaning water pump 3 is operated to supply the cleaning water from the cleaning water tank 2 to the load side heat exchanging portion 1 b of the plate heat exchanger 1. In addition, in the plate heat exchanger 1, the eleventh and twelfth motor-operated valves K are used when washing water is supplied in the same direction (forward direction) as the water flow direction during normal operation of the water circulation circuit 10. , L are closed, and the ninth and tenth motor-operated valves I, J are controlled to open so that the cleaning water flows in the pipes in the order of the black arrows a1 to a10. That is, at the time of washing the plate heat exchanger 1, the load-side heat exchange unit 1b is configured so that the wash water flows in the same direction as the water flow direction during normal operation of the water circulation circuit 10. The vessel 1 is cleaned.

  When the plate heat exchanger 1 performs backwashing in which wash water flows in the direction opposite to the direction of water flow during normal operation of the water circulation circuit 10, the first and second motorized valves A and B are used. Is closed, the ninth and tenth motor-operated valves I and J are closed, and the eleventh and twelfth motor-operated valves K and L are opened while the third and fourth motor-operated valves C and D are open. . Then, the washing water pump 3 is operated so that the washing water flows in the piping in the order of the white arrows b1 to b10. In other words, when the plate heat exchanger 1 is backwashed, the washing water flows in the direction opposite to the flow direction of water during normal operation of the water circulation circuit 10 in the load side heat exchange section 1b of the plate heat exchanger 1. The plate heat exchanger 1 is cleaned so as to flow.

  When cleaning of the plate heat exchanger 1 is completed, the first and second motor-operated valves A and B are closed, and the third, fourth, and ninth to twelfth motor-operated valves C, D, I, J, and K , L are opened, and the opening / closing valve 48 of the cleaning water recovery pipe 49 is opened to recover the cleaning water in the cleaning water circulation circuit 53 to the cleaning water tank 2.

  Thereafter, the third, fourth, ninth, eleventh, and twelfth motor-operated valves C, D, I, K, and L and the on-off valve 48 of the cleaning water recovery pipe 49 are closed, and the first, second, and tenth valves are closed. The motor-operated valves A, B, and J are opened, the faucet 13 is opened, the forward / reverse circulation pump 12 is driven to rotate forward to flow water in the forward direction, and when the water circulation circuit 10 is filled with water, the faucet 13 Is restored to the water closed circuit 10 of the original closed circuit. And when making the direction of the flow of water into the reverse direction, the forward / reverse circulation pump 12 is rotated in the reverse direction so that the wash water flows in the reverse direction.

  In this case as well, if the first pipe 41 is provided with an air introduction pipe with an on-off valve, it becomes easier to drain the water from the water circulation circuit 10 and to collect the washing water from the washing water circulation circuit 53 to the washing water tank 2. .

  Thus, according to the plate type heat exchanger cleaning device for an air conditioner of the present invention, the indoor heat exchanger 4 and the forward / reverse circulation pump 12 and the load side heat exchanger 1b of the plate type heat exchanger 1 are connected. Since the cleaning device 33 unitized between them is arranged so that not only the water circulation circuit 10 but also the washing water circulation circuit 53 can be formed by the cleaning device 33, the plate heat exchanger of the air conditioner can be cleaned. It can be done easily.

  DESCRIPTION OF SYMBOLS 1 Plate type heat exchanger, 1a Heat source side heat exchange part, 1b Load side heat exchange part, 2 washing water tank, 3 washing water pump, 4 indoor heat exchanger, 5 four way valve (washing water flow direction switching means), 10 Water circulation circuit, 11 Water pump, 12 Forward / reverse circulation pump (washing water flow direction switching means), 13 Water faucet, 14 On-off valve, 15 Drain pipe, 20 Refrigerant circulation circuit, 21, 22, 23 Controller, 31, 32, 33 cleaning device, 35, 36 bridge circuit (washing water flow direction switching means), 41 first piping, 42 second piping, 43 bypass piping, 44 first bypass piping for bridge, 45 second bypass piping for bridge, 46 third bypass pipe for bridge, 47 fourth bypass pipe for bridge, 48 on-off valve, 49 wash water recovery pipe, 51, 52, 53 wash water circulation circuit.

Claims (4)

Heat exchange is performed between the refrigerant flowing through the refrigerant circulation circuit on the heat source side and the water flowing through the water circulation circuit on the load side via the heat source side heat exchange unit and the load side heat exchange unit of the plate heat exchanger. In an air conditioner that performs air conditioning in buildings,
The water circulation circuit includes the load-side heat exchange section and an indoor heat exchanger, and the indoor heat exchanger and the load-side heat exchange section are connected by a unitized cleaning device, Water is driven, and the load side heat exchange unit and the indoor heat exchanger are connected in an annular shape through the cleaning device,
The unitized cleaning apparatus is at least
A first pipe connecting one end side of the indoor heat exchanger and one end side of the load side heat exchange unit;
A second pipe connecting the other end side of the load side heat exchange unit and the other end side of the indoor heat exchanger;
A bypass pipe connected between the first pipe and the second pipe;
A first motor-operated valve provided between the water pump in the first pipe and a connection portion of the bypass pipe;
A second motor-operated valve provided between the indoor heat exchanger in the second pipe and a connection part of the bypass pipe;
A washing water tank and a washing water pump provided in the middle of the bypass pipe;
A third motor operated valve provided between the washing water pump in the bypass pipe and a connection portion of the first pipe;
A fourth motor operated valve provided between the wash water tank in the bypass pipe and a connection portion of the second pipe;
Wash water flow direction switching means for controlling the flow direction of the wash water discharged from the wash water pump,
A controller for controlling the first to fourth electric valves, the washing water pump, and the washing water flow direction switching means,
The control device closes the first and second motor-operated valves and opens the third and fourth motor-operated valves, so that the cleaning water tank, the cleaning water pump, and the load-side heat exchange unit Forming a wash water circulation circuit connected by the first pipe, the second pipe, and the bypass pipe, and driving the wash water pump to wash the plate heat exchanger, Further, the plate type heat exchanger is backwashed by switching the washing water flow direction switching means so that the flow direction of the washing water passing through the load-side heat exchange unit is reversed. Cleaning device for air conditioner plate heat exchanger. The washing water flow direction switching means is formed by a bridge circuit,
The bridge circuit is
A fifth motor-operated valve provided between a connection part of the bypass pipe in the first pipe and the load side heat exchange part;
A sixth motor-operated valve provided between a connection part of the bypass pipe in the second pipe and the load-side heat exchange part;
One end is connected between the connection part of the bypass pipe in the first pipe and the fifth motor operated valve, and the sixth motor operated valve in the second pipe and the load side heat exchange part A first bypass pipe for bridge with the other end connected in between,
One end is connected between the connection part of the bypass pipe in the second pipe and the sixth motor-operated valve, and the fifth motor-operated valve in the first pipe and the load side heat exchange part A second bypass pipe for bridge with the other end connected in between;
A seventh motor-operated valve provided in the middle of the bridge first bypass pipe;
An eighth motor operated valve provided in the middle of the second bypass pipe for bridge,
The third, fourth, fifth, and sixth motor-operated valves are opened, and the first, second, seventh, and eighth motor-operated valves are closed to pass through the load-side heat exchange unit. The direction of the flow of the washing water is positive, the first, second, fifth and sixth motor-operated valves are closed, and the third, fourth, seventh and eighth motor-operated valves are opened. The plate type heat exchanger cleaning apparatus for an air conditioner according to claim 1, wherein the flow direction of the cleaning water passing through the load side heat exchange section is reversed.   The washing water flow direction switching means is a four-way valve that is arranged on the discharge side of the washing water pump and switches the discharge flow path of the washing water pump between the first pipe and the second pipe. The plate type heat exchanger cleaning device for an air conditioner according to claim 1, wherein the cleaning device is formed. The washing water flow direction switching means is formed by a bridge circuit,
The bridge circuit is
A ninth motor valve provided between the washing water pump and the third motor valve in the bypass pipe;
A tenth motor-operated valve provided between a connection portion of the bypass pipe in the second pipe and the load side heat exchange section;
One end is connected between the third motor-operated valve and the ninth motor-operated valve in the bypass pipe, and between the second motor-operated valve and the tenth motor-operated valve in the second pipe. A third bypass pipe for bridge with the other end connected to
One end is connected between the washing water pump and the ninth motor-operated valve in the bypass pipe, and the other is connected between the tenth motor-operated valve and the load-side heat exchange unit in the second pipe. A fourth bypass pipe for the bridge to which the end is connected;
An eleventh motor operated valve provided in the middle of the bridge third bypass pipe;
A twelfth motor-operated valve provided in the middle of the bridge fourth bypass pipe,
The third, fourth, ninth, and tenth motor-operated valves are opened, and the first, second, eleventh, and twelfth motor-operated valves are closed to pass through the load-side heat exchange unit. The direction of the flow of washing water is positive, the first, second, ninth, and tenth motor-operated valves are closed, and the third, fourth, eleventh, and twelfth motor-operated valves are opened. The plate type heat exchanger cleaning apparatus for an air conditioner according to claim 1, wherein the flow direction of the cleaning water passing through the load side heat exchange section is reversed.

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