JP2014062722A - Coolant circuit unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coolant circuit unit facilitating maintenance of an electromagnetic coil mounted in a cylinder section of an electronic valve.SOLUTION: A coolant circuit unit includes: a connection pipe unit including an electronic valve switching the connection between a high pressure gas connection pipe and a low pressure gas connection pipe connected to outdoor equipment and a gas connection pipe connected to indoor equipment; a heat insulating material case storing the connection pipe unit; and a body case surrounding the heat insulating case. The electronic valve includes an electromagnetic coil, a cylinder section and an electronic valve body. A body section includes a storage section storing the electromagnetic coil on a front surface, an opening section drawing the cylinder section from the inside of the body in the storage section, an electronic valve mounting plate into which the cylinder section is inserted and which closes the opening section, the body case surrounding surfaces except a front surface of the heat insulating material case, and an electronic valve lid covering a front surface of the body case. The electromagnetic coil is disposed outside the heat insulating case, and the electromagnetic coil is closed by the electronic valve lid, thereby facilitating maintenance since the electromagnetic coil appears by only removing the electronic valve lid.

Description

  The present invention relates to the structure of a refrigerant circuit unit.

  In the refrigerant circuit unit 100 of the air conditioner, as shown in FIG. 10, refrigerant is supplied from the refrigerant pipe 110 on the outdoor unit side, the branch refrigerant pipes 111 on the plurality of indoor units side, and the refrigerant pipe 110 to the branch refrigerant pipe 111. A connecting pipe unit 140 comprising a branch pipe 112 that branches and a branch section 130 having an electronic valve 120 that adjusts the amount of refrigerant is sandwiched between the upper sealing case 151 and the lower sealing case 152 made of resin, and is brought into close contact therewith. The upper heat insulating case 161 and the lower heat insulating material case 162 are attached to the upper airtight case 151 and the lower airtight case 152, and the outer case of the upper heat insulating material case 161 and the lower heat insulating material case 162 is attached to the upper case 171 made of sheet metal. And the lower case 172 so that the periphery of the branch portion 130 is hermetically sealed and the connecting pipe unit 140 is Is that to prevent the occurrence of condensation due to the refrigerant. (For example, see Patent Document 1)

JP 2012-13275 A

The refrigerant circuit unit 100 described above is a refrigerant branch unit that branches the refrigerant from one or a plurality of outdoor units to a plurality of indoor units, but today's refrigerant circuit unit is a plurality of indoor units from one or a plurality of outdoor units. Some of them also serve as a switching unit for simultaneous cooling and heating operation for branching the refrigerant to the unit and switching the operation of each indoor unit to the cooling operation or the heating operation.
In order to support simultaneous cooling and heating operation, the gas refrigerant piping on the outdoor unit side, which was one in the previous example, is drawn into the low-pressure gas pipe and the high-pressure gas pipe separately from the outdoor unit side, and this is requested on the indoor unit side. Accordingly, an electronic valve for selecting either the low pressure gas pipe or the high pressure gas pipe is required. The electronic valve is composed of an electronic valve main body, a cylinder part, and an electromagnetic coil for operating the cylinder part. Among them, the electromagnetic coil is likely to fail due to seizure and may require replacement or repair maintenance.

  However, in the case of the prior art, the electronic valve 120 is disposed in the branch part 130 and sealed with the sealed cases 151 and 152, the heat insulating material cases 161 and 162, and the upper case 171 and the lower part 172. Therefore, it is very difficult to maintain the electromagnetic coil of the electronic valve 120.

  In order to seal the branch portion 130, it is covered with the sealing cases 151 and 152. However, since the sealing cases 151 and 152 are made of resin, material costs and mold costs are increased, leading to an increase in cost.

  In view of the above problems, an object of the present invention is to provide a refrigerant circuit unit in which maintenance of an electromagnetic coil for operating a cylinder portion of an electronic valve is easy and the refrigerant circuit unit can be disassembled. is there.

  In order to achieve the above object, the present invention provides a high-pressure gas connection pipe and a low-pressure gas connection pipe provided between an outdoor unit and an indoor unit, and connected to the outdoor unit, and a gas connection pipe connected to the indoor unit. A refrigerant circuit unit comprising a connecting pipe unit having an electronic valve for switching the connection between the high-pressure gas connecting pipe or the low-pressure gas connecting pipe and the gas connecting pipe, and a main body housing the connecting pipe unit. The electronic valve is composed of an electromagnetic coil, a shaft-like cylinder portion on which the electromagnetic coil acts, and an electronic valve main body that operates by the action of the cylinder portion, and the connecting pipe unit includes the high-pressure gas connecting pipe And the low-pressure gas connection pipe is disposed at the lower part of the front surface, the gas connection pipe is disposed at the upper part of the rear surface, the cylinder part is directed forward, and the electronic valve body is disposed at the high-pressure gas connection pipe and the low-pressure gas connection pipe. On the top of The main body is provided with a housing portion for housing the electromagnetic coil on a front surface, and a heat insulating material case for housing the connecting pipe unit with the housing portion having an opening for pulling out the cylinder portion from the body. An electronic valve mounting plate that is moved from the front surface in the axial direction of the cylinder portion to pass through the cylinder portion and closes the opening, a main body case surrounding a surface other than the front surface of the heat insulating material case, and It consists of an electronic valve lid that covers the front.

  The present invention is provided between an outdoor unit and an indoor unit, and is connected to the outdoor unit, a high pressure gas connection pipe and a low pressure gas connection pipe, a gas connection pipe connected to the indoor unit, a high pressure gas connection pipe or a low pressure A connecting pipe unit having an electronic valve for switching the connection between the gas connecting pipe and the gas connecting pipe, a heat insulating material case for housing the connecting pipe unit, and a main body case surrounding the heat insulating material case. Refrigerant circuit in which the electromagnetic coil acting on the part is arranged outside the heat insulating material case, and the electromagnetic coil is closed by the electronic valve lid, so that the electromagnetic coil appears just by removing the electronic valve lid and maintenance is easy Become a unit.

It is a schematic block diagram of the multi-chamber air conditioner of this invention. It is an external view of the refrigerant | coolant switching unit of this invention. It is an external view of the connecting pipe unit of the present invention. It is a refrigerant circuit diagram of the refrigerant switching unit of the present invention. It is an exploded view of the refrigerant | coolant switching unit of this invention. It is a side view of the heat insulating material case of this invention. It is the external view which looked at the upper heat insulating material case of this invention from the downward direction. It is an assembly drawing of the heat insulating material case of the present invention. It is an assembly drawing of the electronic valve partition plate of this invention. It is sectional drawing of the refrigerant circuit unit of a prior art example.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out the invention will be described in detail below as an embodiment based on the accompanying drawings.

  As a refrigerant circuit unit, one or a plurality of outdoor units and a plurality of indoor units are connected, and a refrigerant switching unit used in a multi-room air conditioner capable of performing a so-called cooling / heating simultaneous operation in which a cooling operation and a heating operation are switched for each indoor unit. Will be described as an example. The refrigerant switching unit is provided between the outdoor unit and the indoor unit, and selects one of the two refrigerant pipes connected to the outdoor unit and passes the refrigerant through the refrigerant pipe of the indoor unit. Is switched to a cooling operation or a heating operation.

<Multi-room air conditioner>
As shown in FIG. 1, the multi-room air conditioner 1 includes outdoor units 11 and 12 and a plurality of indoor units 13, 14, and 15.
In this embodiment, there are two outdoor units, but one or a plurality of outdoor units may be used, and there are three indoor units, but two or three or more can be connected.
The outdoor units 11 and 12 include an outdoor heat exchanger, a part of a refrigerant circuit such as a compressor and a four-way valve, and a blower fan that allows air to flow between the refrigerant in the outdoor heat exchanger and the outside air. And a fan motor for driving the blower fan and a control circuit (both not shown) for controlling them.
Each of the indoor units 13, 14, and 15 includes a part of a refrigerant circuit such as an indoor heat exchanger, and a blower fan that causes air to flow to exchange heat between the refrigerant in the indoor heat exchanger and the indoor air, A fan motor for driving the blower fan and a control circuit (none of which is shown) for controlling these components are incorporated.

The refrigerant circuits in the outdoor units 11 and 12 are connected to an outdoor unit side refrigerant pipe 20 including a high pressure gas pipe 200, a low pressure gas pipe 201, and a liquid pipe 202, respectively. The high-pressure gas pipe 200, the low-pressure gas pipe 201, and the liquid pipe 202 of each of the outdoor units 11 and 12 are connected together via the branch pipe 16 and connected to the indoor unit side.
An indoor unit side refrigerant pipe 21 including a gas pipe 210 and a liquid pipe 212 is connected to the refrigerant circuit in each of the indoor units 13, 14, and 15.
The refrigerant switching unit 3 is arranged for each indoor unit between the outdoor unit side refrigerant pipe 20 and the indoor unit side refrigerant pipe 21, and is divided into a high pressure gas pipe 200 and a low pressure gas pipe 201 branched by the branch pipe 16 for each indoor unit. The gas pipe 210 is connected and switched to one of the high pressure gas pipe 200 and the low pressure gas pipe 201.
The liquid pipe 202 and the liquid pipe 212 are separated from the refrigerant switching unit 3 and are independently connected to each indoor unit between the outdoor unit and the indoor unit. However, like the refrigerant switching unit 3a, the refrigerant switching unit 3a It may be arranged inside and connected.

<Refrigerant switching unit>
As shown in FIG. 2, the refrigerant switching unit 3 includes a high-pressure gas connection pipe 400 connected to the high-pressure gas pipe 200 by welding or pipe joint, and a low-pressure gas connection pipe connected to the low-pressure gas pipe 201 by welding or pipe fitting. 401, a connecting pipe unit 40 including a gas connecting pipe 410 connected to the gas pipe 210 by welding or a pipe joint, a main body 30 that houses the connecting pipe unit 40, and electrical components of the connecting pipe unit 40 are controlled. It is comprised with the electrical component box 31 provided with the control part.
The refrigerant switching unit 3 is fixed by being suspended from the ceiling in a horizontal manner on an indoor ceiling or the like by a ceiling hanging bracket 32. And, in order to cope with the environment of the back of the ceiling which is likely to be hot and humid, the inside of the main body 30 has a heat insulating property so as not to be affected by the temperature change and a structure sealed so as not to be affected by the humidity. It has become.

  In the following description, in the refrigerant switching unit 3 shown in FIG. 2, the surface on which the high-pressure gas connection pipe 400 and the low-pressure gas connection pipe 401 on the outdoor unit side are arranged is the front surface, and the gas connection pipe 410 on the indoor unit side is The surface on which the electrical component box 31 is disposed will be described as the left surface, the surface facing the right surface, the surface to which the ceiling bracket 32 is attached as the top surface, and the surface as the bottom surface.

<Connection pipe unit>
As shown in FIG. 3, the connecting pipe unit 40 includes a high pressure gas connecting pipe 400, a low pressure gas connecting pipe 401, a gas connecting pipe 410, an upper on-off valve group V1, a lower on-off valve group V2, and the like.
The high-pressure gas connection pipe 400 and the low-pressure gas connection pipe 401 extend in parallel to the outdoor unit side at the lower part of the front surface of the connection pipe unit 40, and the gas connection pipe 410 is connected to the indoor unit side at the upper part of the rear surface of the connection pipe unit 40. Arranged to stretch.
The gas connection pipe 410 is connected to the high-pressure gas connection pipe 400 and the low-pressure gas connection pipe 401 via the upper on-off valve group V1 and the lower on-off valve group V2.
The upper on-off valve group V1 includes electronic valve on-off valves 50, 51, and 52 arranged in parallel on the upper side of the connecting pipe unit 40, and the lower on-off valve group V2 is lower than the upper on-off valve group V1. The high-pressure gas connection pipe 400 and the low-pressure gas connection pipe 401 are composed of on-off valves 53 and 54 arranged in parallel above the low-pressure gas connection pipe 401.

<Open / close valve>
The on-off valve 50 of the upper on-off valve group V1 includes an electronic valve main body 500, a cylinder portion 501, and an electromagnetic coil 502. The on-off valve 51 is also composed of an electronic valve body 510, a cylinder part 511, and an electromagnetic coil 512, and the on-off valve 52 is also composed of an electronic valve body 520, a cylinder part 521, and an electromagnetic coil 522.
The on-off valve 53 of the lower on-off valve group V2 is composed of an electronic valve main body 530, a cylinder portion 531 and an electromagnetic coil 532, and the on-off valve 54 is also composed of an electronic valve main body 540, a cylinder portion 541 and an electromagnetic coil 542.
The cylinder portions 501, 511, 521, 531 and 541 are axial and extend toward the front surface on which the low-pressure gas connection pipe 401 is installed. The cylinders of the respective electromagnetic coils 502, 512, 522, 532 and 542 The respective electromagnetic coils 502, 512, 522, 532, and 542 are attached by being inserted into the mounting holes 502a, 512a, 522a, 532a, and 542a provided on the side surfaces of the parts. Accordingly, the respective electromagnetic coils 502, 512, 522, 532, and 542 are arranged in parallel toward the front surface.
And each electromagnetic coil 502 * 512 * 522 * 532 * 542 act | operates each cylinder part 501,511 * 521 * 531, * 541, and the electronic valve main body 500 * 510 * 520 * 530 * 540 act | operates. Then, either one of the high-pressure gas connection pipe 400 and the low-pressure gas connection pipe 401 is connected to the gas connection pipe 410 to switch between cooling and heating.
As the on-off valves 50, 51, and 52, electromagnetic valves such as electronic expansion valves may be used depending on the type and application of the connected indoor unit.

<Refrigerant circuit in connecting pipe unit>
As shown in FIG. 4, the open / close valve 50 of the upper open / close valve group V <b> 1 is connected between the gas connection pipe 410 and the high-pressure gas connection pipe 400. Further, the on-off valves 51 and 52 of the upper on-off valve group V1 are connected between the gas connection pipe 410 and the low-pressure gas connection pipe 401. The on-off valve 51 is connected to a branch pipe 420 between the gas connection pipe 410 and the low-pressure gas connection pipe 401, and the refrigerant pressure is reduced by dividing the flow rate of the refrigerant flowing from the gas connection pipe 410 by the branch pipe 420. This can reduce the noise of the refrigerant during the cooling operation of the indoor unit.

The on-off valve 53 of the lower on-off valve group V2 is connected to the high-pressure gas connection pipe 400. The on-off valve 54 is connected to the low pressure gas connection pipe 401.
When the operation of the indoor unit is switched, a capillary tube 55 that reduces the amount of refrigerant flowing between the high-pressure gas connection pipe 400 and the low-pressure gas connection pipe 401 and gradually adjusts the pressure is connected to the on-off valve 53 in parallel. Yes. A connection point between the on-off valve 53 and the on-off valve 54 is a capillary that reduces the amount of refrigerant flowing between the high-pressure gas connection pipe 400 and the low-pressure gas connection pipe 401 and gradually adjusts the pressure when switching the operation of the indoor unit. A tube 56 is connected, and the capillary tube 56 is connected to the gas connection pipe 410. The on-off valves 53 and 54 operate as auxiliary electromagnetic valves for the purpose of equalizing the refrigerant pressure during the operation of the indoor unit.

In FIG. 1, the indoor unit 14 is in a heating operation. In this case, the on-off valve 50 is opened and the on-off valves 51, 52 are closed. The refrigerant flows from the high-pressure gas connection pipe 400 to the gas connection pipe 410, passes through the gas pipe 210, exchanges heat with indoor air in the heat exchanger in the indoor unit 14, performs a heating operation, and returns to the liquid pipe 212.
The indoor units 13 and 15 are in the cooling operation. In this case, the on-off valve 50 is closed and the on-off valves 51 and 52 are opened. The refrigerant passes through the liquid pipe 212, exchanges heat with indoor air in the heat exchanger in the indoor unit 14, performs a cooling operation, flows into the gas pipe 210, and returns to the low-pressure gas connection pipe 401.

<Main body>
As shown in FIGS. 2 and 5 to 9, the main body portion 30 includes a storage portion 612 that houses electromagnetic coils 502, 512, 522, 532, and 542 on the front surface, and a cylinder portion 501 in the storage portion 612 from within the main body. The connecting pipe unit 40 is housed in the heat insulating material case 6 provided with the opening 615 for drawing out 511, 521, 531 and 541, and pulled out from the opening 615 into the cylinder drawing hole 730 of the electronic valve mounting plate 73. The cylinder parts 501, 511, 521, 531 and 541 are inserted, and the electronic valve mounting plate 73 is moved from the front in the axial direction of the cylinder parts 501, 511, 521, 531 and 541 to close the opening 615, and the cylinder Electromagnetic coils 502, 512, 522, 532, and 542 are fixed to the tips of the parts 501, 511, 521, 531, and 541, respectively. 512, 522, 532, and 542 are housed in the housing portion, and the surface other than the front surface of the heat insulating material case 6 is surrounded by the main body case 7 and the front surface of the main body case 7 is covered by the electronic valve lid 74 and the pipe fixing plates 75 and 76. It is a configuration.

<Insulation case>
As shown in FIGS. 5 to 8, the heat insulating material case 6 is a box shape matched to the main body case 7, and is formed of a foamed polystyrene having excellent heat insulating properties. Have.
The heat insulating material case 6 includes an upper heat insulating material case 61 having a storage portion 612 and an opening 615, and a lower heat insulating material case 62. The upper heat insulating material case 61 and the lower heat insulating material case 62 are upper surfaces that are mating surfaces of each other. The case mating surface 64 and the lower case mating surface 65 abut.
As shown in FIG. 6, the upper case mating surface 64 and the lower case mating surface 65 are connected to the first horizontal plane 66 at the center of the diameter of the high pressure gas connection pipe 400 and the low pressure gas connection pipe 401 on the front side, and to the gas connection on the back side. The tube 410 is formed by a second horizontal surface 67 at the center of the tube diameter, and a surface 68 connecting the end portions of the first horizontal surface and the second horizontal surface.

<Upper insulation case>
As shown in FIGS. 5 and 7, the connecting pipe mounting portion 610 including the connecting pipe mounting surface 640 and the connecting pipe mounting surface 640 corresponding to the first horizontal surface of the upper heat insulating material case 61 includes the high pressure gas connecting pipe 400 and the low pressure. A notch is formed in a semicircular shape along the outer periphery of the gas connection tube 401, and a connection tube attachment portion 611 including a connection tube attachment surface 641 and a connection tube attachment surface 641 corresponding to the second horizontal surface of the upper heat insulating material case 61 is provided in the connection tube attachment portion 611. A cutout is formed in a semicircular shape along the outer periphery of the gas connection pipe 410.
The upper part of the connecting pipe attaching part 610 of the upper heat insulating material case 61 is largely cut off to form a storage chamber 612 in which the aforementioned electromagnetic coil is stored. A vertical surface facing the storage chamber 612 is an electromagnetic coil mounting surface 613. The electromagnetic coil mounting surface 613 is formed with an opening 615 that opens on the left and right side surfaces, leaving a wall that reinforces the casing.
After housing the connecting pipe unit 40 in the heat insulating material case 6, as shown in FIG. 8, the opening / closing valves 50, 51, 52, 53, 54 appear from the opening 615, and the cylinder parts 501, 511, 521. -531 and 541 are pulled out to the storage chamber 612. In the storage chamber 612, electromagnetic coils 502, 512, 522, 532, and 542 attached to the cylinder portions 501, 511, 521, 531, and 541 are stored in parallel.

  An insert-molded mounting bracket 81 is fixed to the top of the top surface 614 and the electromagnetic coil mounting surface 613 surrounding the opening 615. A seal member 91 is affixed on the mounting bracket 81. Further, an insert-molded mounting bracket 82 is also fixed at the boundary between the upper portion of the connecting pipe mounting portion 610 and the electromagnetic coil mounting surface 613.

The upper case mating surface 64 of the upper heat insulating material case 61 is connected to the connecting pipe mounting surface 640 corresponding to the first horizontal plane, the connecting pipe mounting surface 641 corresponding to the second horizontal plane, and the end of the connecting pipe mounting surface 640. The right inclined surface 642 and the left inclined surface 643 configured on the surface connecting the ends of the tube attachment surface 641, the right central attachment surface 644 and the left central formed horizontally at the center of the right inclined surface 642 and the left inclined surface 643. And mounting surface 645.
The connecting tube mounting surface 640, the connecting tube mounting surface 641, the right center mounting surface 644, and the left center mounting surface 645 each have a protruding portion 646 protruding from the left and right side surfaces, and the connecting tube mounting surface 640, the connecting tube mounting surface 641, and the right side. Six insert fittings 83 are fixed near the protrusions 646 of the central mounting surface 644 and the left central mounting surface 645.

<Lower insulation case>
As shown in FIG. 5, a high pressure gas connection pipe 400 and a low pressure gas connection pipe are provided in a connection pipe attachment portion 620 including a connection pipe attachment surface 650 and a connection pipe attachment surface 650 corresponding to the first horizontal plane of the lower heat insulating material case 62. A gas connection is made to the connecting pipe mounting portion 621 which is formed in a semicircular shape along the outer periphery of 401 and includes the connecting pipe mounting surface 651 and the connecting pipe mounting surface 651 corresponding to the second horizontal surface of the lower heat insulating material case 62. A notch is formed in a semicircular shape along the outer periphery of the tube 410.

The lower case mating surface 65 of the lower heat insulating material case 62 is connected to the connecting pipe mounting surface 650 corresponding to the first horizontal plane, the connecting pipe mounting surface 651 corresponding to the second horizontal plane, and the end of the connecting pipe mounting surface 650. The right inclined surface 652 and the left inclined surface 653 configured on the surface connecting the ends of the tube attachment surface 651, the right central attachment surface 654 formed horizontally at the center of the right inclined surface 652 and the left inclined surface 653, and the left center. And mounting surface 655.
The connecting tube mounting surface 650, the connecting tube mounting surface 651, the right center mounting surface 654, and the left center mounting surface 655 each have a protruding portion 656 that forms a groove 657 in the center toward the left and right side surfaces, and the connecting tube mounting surface 650 Six insert fittings 84 are fixed near the protruding portion 656 of the connecting pipe mounting surface 651, the right center mounting surface 654, and the left center mounting surface 655.

<Body case>
As shown in FIG. 5, the main body case 7 includes an upper main body case 71 that forms a top surface and left and right side surfaces formed by bending a steel plate, a bottom surface formed by bending the steel plate, and a lower portion of the gas connection pipe 410. And a lower main body case 72 which forms the back surface for supporting the.
The upper body case 71 is provided with a cable lead hole 710 on the left side surface.

<Electronic valve mounting plate>
The electronic valve mounting plate 73 is formed by bending a steel plate and includes a cylinder drawing hole 730. A heat insulating material 731 is provided on the back side to reinforce the sealing and heat insulating properties of the cylinder drawing hole 730 and the opening 615. Are attached to the left and right side surfaces of the upper main body case 71 and the mounting brackets 81 and 82 of the upper heat insulating material case 61 with screws.

<Electronic valve lid>
The electronic valve lid 74 is a flat steel plate having a plurality of ventilation holes 741 and is screwed to the upper body case 71.

<Piping fixing plate>
The pipe fixing plate 75 fixes the upper parts of the high-pressure gas connection pipe 400 and the low-pressure gas connection pipe 401 on the front side of the connection pipe mounting portion 610 of the high-pressure gas connection pipe 400 and the low-pressure gas connection pipe 401. Screwed.
The pipe fixing plate 76 fixes the lower portions of the high pressure gas connecting pipe 400 and the low pressure gas connecting pipe 401 on the front side of the connecting pipe mounting portion 620 of the high pressure gas connecting pipe 400 and the low pressure gas connecting pipe 401, and It is locked by the locking claw 761 and screwed to the upper body case 71.
The pipe fixing plate 77 fixes the upper part of the gas connection pipe 410 on the back surface of the connection pipe attachment part 611 of the gas connection pipe 410 and is screwed to the upper body case 71.

<Assembly method>
The refrigerant switching unit 3 is assembled by reversing the top and bottom from the installation state suspended from the ceiling.
First, the connecting pipe unit 40 is mounted with the top surface 614 of the upper heat insulating material case 61 facing down. Specifically, the cylinder parts 501, 511, 521, 531, 541 of the on-off valves 50, 51, 52, 53, 54 are pulled out to the opening part 615, and the front-side connection pipe attachment part 610 and the rear-side connection pipe attachment are attached. The high pressure gas connection pipe 400, the low pressure gas connection pipe 401 and the gas connection pipe 410 are attached to the part 611.
Next, the seal member 93 is sandwiched along the upper case mating surface 64 of the upper heat insulating material case 61, and the lower case mating surface 65 of the lower heat insulating material case 62 is brought into contact with the upper case mating surface 64 of the upper heat insulating material case 61. Put on. Thereafter, a screwdriver is inserted into the six groove portions 657 of the lower heat insulating material case 62, and the attachment fitting 83 of the upper heat insulation material case 61 and the attachment fitting 84 of the lower heat insulation material case 62 are screwed together with screws. Then, the top surface 614 is raised so that it faces upward. This state is as shown in FIG.

  Next, the electronic valve mounting plate 73 is moved in the axial direction of the cylinder portions 501, 511, 521, 531, and 541 so that the cylinder portions 501, 511, 521, 531, and 541 are inserted into the cylinder drawing holes 730. Then, the opening 615 is closed by the electronic valve mounting plate 73 and screwed to the mounting brackets 81 and 82 of the upper heat insulating material case 61. The electromagnetic coils 502, 512, 522, 532, and 542 are attached to the cylinder portions 501, 511, 521, 531, and 541 inserted through the electronic valve mounting plate 73. The electromagnetic coils 502, 512, 522, 532, and 542 are accommodated in the storage chamber 612. As shown in FIG. 9, cables 90 are connected to the electromagnetic coils 502, 512, 522, 532, and 542, respectively, and the cables 90 are bundled together by a clamper 91.

Then, the lower heat insulating material case 62 is put on the lower main body case 72 together. The upper main body case 71 is covered from above, and the upper main body case 71 and the lower main body case 72 are screwed together.
In order to further reinforce the electronic valve mounting plate 73 housed in the upper main body case 71, the left and right side surfaces of the upper main body case 71 and the left and right side surfaces of the electronic valve mounting plate 73 are screwed together with screws.
The cables 90 bundled together by the clamper 91 are drawn out from the cable drawing hole 710 of the upper body case 71.
Further, the front surface of the upper main body case 71 is covered with the electronic valve lid 74 and screwed with screws, and the pipe fixing plates 75, 76 and 77 are screwed into the upper main body case 71, respectively.
Finally, the electrical component box 31 and the cable 90 are connected, and the electrical component box 31 is assembled to the left side surface of the upper body case 71.

With the above configuration and assembly, the electromagnetic coils 502, 512, 522, 532, and 542 attached to the cylinder portion of the electronic valve that causes the most failure in the refrigerant switching unit 3 are placed outside the heat insulating material case 6. It will be arrange | positioned and will be obstruct | occluded only by the main body case 7 and the electronic valve lid 74. FIG. Therefore, the electromagnetic coils 502, 512, 522, 532, and 542 arranged in parallel appear only by removing the electronic valve lid 74, and replacement and repair maintenance can be easily performed.
In addition, since the heat generated by the electromagnetic coils 502, 512, 522, 532, and 542 is radiated to the outside from the vent hole 741 of the electronic valve lid 74, the heat does not flow into the storage chamber 612 and the cause of failure is reduced. it can.

Furthermore, the upper body case 71 and the lower body case 72 are only screwed and fixed to the main body 3, and the upper heat insulating material case 61 is insert-molded with the mounting bracket 83, and the lower heat insulating material case 62 is insert-molded with the mounting hardware 84. The mounting bracket 83 and the mounting bracket 84 are only screwed and fixed, and the other electronic valve mounting plate 73, electronic valve lid 74, and pipe fixing plates 75, 76, and 77 are also fixed to the main body case 7 with screws. Therefore, it can be disassembled simply by removing each screw, and parts other than the electromagnetic coil of the connecting pipe unit 4 housed in the main body 3, such as the electronic valve main body 500, 510, 520, 530, 640 can also be repaired and replaced.
And since a sealed case is not used like a prior art example, a manufacturing cost is also reduced.

1: Multi-chamber air conditioner 3: Refrigerant switching unit 30: Main body 40: Connection pipe unit 400: High pressure gas connection pipe 401: Low pressure gas connection pipe 410: Gas connection pipe 50, 51, 52, 53, 54, 55 : Open / close valve (electronic valve)
500, 510, 520, 530, 540, 550: electronic valve main body 501, 511, 521, 531, 541, 551: cylinder part 502, 512, 522, 532, 542, 552: electromagnetic coil 6: heat insulating material case 61: Upper heat insulating material case 612: Storage chamber 615: Opening 62: Lower heat insulating material case 7: Main body case 71: Upper main body case 72: Lower main body case 73: Electronic valve mounting plate 74: Electronic valve lid 81-84: Mounting bracket

Claims (3)

A high-pressure gas connection pipe and a low-pressure gas connection pipe provided between the outdoor unit and the indoor unit and connected to the outdoor unit, a gas connection pipe connected to the indoor unit, and the high-pressure gas connection pipe or the low-pressure gas connection A refrigerant circuit unit comprising a connection pipe unit provided with an electronic valve for switching connection between the pipe and the gas connection pipe, and a main body portion that houses the connection pipe unit,
The electronic valve is composed of an electromagnetic coil, a shaft-shaped cylinder portion on which the electromagnetic coil acts, and an electronic valve body that operates by the action of the cylinder portion,
In the connecting pipe unit, the high-pressure gas connecting pipe and the low-pressure gas connecting pipe are arranged in the lower part of the front surface, the gas connecting pipe is arranged in the upper part of the rear surface, and the electronic valve body is arranged with the cylinder part facing forward. Arranged above the high-pressure gas connection pipe and the low-pressure gas connection pipe,
The main body includes a housing portion that houses the electromagnetic coil on a front surface, a heat insulating material case that houses the connecting pipe unit with an opening for pulling out the cylinder portion from the main body in the housing portion,
An electronic valve mounting plate that moves from the front surface in the axial direction of the cylinder portion to pass through the cylinder portion and closes the opening;
A body case surrounding a surface other than the front surface of the heat insulating material case;
A refrigerant circuit unit comprising an electronic valve lid that covers a front surface of the main body case.   The heat insulating material case includes an upper heat insulating material case having the opening and a lower heat insulating material case, and the upper heat insulating material case and the lower heat insulating material case are in contact with each other at a mating surface, The first horizontal plane in the center of the pipe diameter of the outdoor unit side connection pipe on the outdoor side surface, the second horizontal plane in the center of the pipe diameter of the indoor unit side connection pipe on the indoor side face, the first horizontal plane and the second horizontal plane. The refrigerant circuit unit according to claim 1, wherein the refrigerant circuit unit is formed by a surface connecting the ends of the refrigerant circuit unit.   The refrigerant according to claim 1, further comprising mounting brackets that are inserted in advance on a periphery and a mating surface of the opening of the upper heat insulating material case and a mating surface of the lower heat insulating material case. Circuit unit.

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