JP2021067372A - Cooling/heating switching device - Google Patents

Abstract

To downsize a control part.SOLUTION: A cooling/heating switching device comprises: a pipe part comprising a plurality of refrigerant pipes connected to a plurality of indoor units and at least one outdoor unit, and a plurality of opening/closing valves provided in the plurality of refrigerant pipes; a driving part comprising a plurality of opening/closing mechanisms for opening/closing the plurality of opening/closing valves respectively; a control part for controlling the plurality of opening/closing mechanisms; and a case in which the pipe part, the driving part, and the control part are housed. The control part comprises: a plurality of control circuit boards for controlling the plurality of opening/closing mechanisms; a plurality of power circuit boards for supplying power to the plurality of opening/closing mechanisms; and a board housing space provided in the case, and in which the plurality of control circuit boards and the plurality of power circuit boards are housed. In the board housing space, the plurality of control circuit boards are arranged along one direction, and the plurality of power circuit boards are stacked on the plurality of control circuit boards, and arranged along the one direction.SELECTED DRAWING: Figure 7

Description

The present invention relates to a cooling / heating switching device.

In an air conditioner (refrigeration cycle device) including a plurality of indoor units and outdoor units, a collective cooling / heating switching device for switching the operating states of cooling and heating of the plurality of indoor units is known. This type of cooling / heating switching device includes a piping unit having a plurality of refrigerant pipes connected to a plurality of indoor units and outdoor units, a plurality of on-off valves provided in the plurality of refrigerant pipes, and a plurality of on-off valves. Some include a drive unit having a plurality of opening / closing mechanisms for opening / closing each of the above, a control unit for controlling the plurality of opening / closing mechanisms, and a housing for accommodating the piping unit, the drive unit, and the control unit. The control unit has a plurality of circuit boards for controlling the plurality of opening / closing mechanisms and supplying electric power to the plurality of opening / closing mechanisms, and a substrate accommodating space for accommodating the plurality of circuit boards.

Japanese Unexamined Patent Publication No. 2014-163657

By the way, the control unit of the above-mentioned cooling / heating switching device includes one circuit board for each refrigerant circulation circuit having two refrigerant pipes connected to one indoor unit. Therefore, there is a problem that the substrate accommodating space occupied in the housing is large and the entire device and the housing become large. This problem becomes more remarkable as the number of indoor units connected to the cooling / heating switching device increases.

The disclosed technique has been made in view of the above, and an object of the present invention is to provide a cooling / heating switching device capable of miniaturizing a control unit.

One aspect of the cooling / heating switching device disclosed in the present application is a piping unit having a plurality of indoor units and a plurality of refrigerant pipes connected to at least one outdoor unit, and a plurality of on-off valves provided in the plurality of refrigerant pipes. A drive unit having a plurality of opening / closing mechanisms for opening / closing a plurality of on-off valves, a control unit for controlling the plurality of on-off mechanisms, and a housing for accommodating a piping unit, a drive unit, and a control unit. The control unit includes a plurality of control circuit boards that control a plurality of opening / closing mechanisms, a plurality of power supply circuit boards for supplying electric power to the plurality of opening / closing mechanisms, a plurality of control circuit boards provided in the housing, and a plurality of control circuit boards. It has a substrate accommodating space for accommodating a power supply circuit board, and a plurality of control circuit boards are arranged along one direction in the substrate accommodating space, and a plurality of power supply circuit boards are laminated on a plurality of control circuit boards. And arranged along one direction.

According to one aspect of the cooling / heating switching device disclosed in the present application, the control unit can be miniaturized.

FIG. 1 is a schematic view showing an air conditioner including the cooling / heating switching device of the embodiment. FIG. 2 is a perspective view showing a cooling / heating switching device of an embodiment. FIG. 3 is a perspective view showing the cooling / heating switching device of the embodiment from the lower side. FIG. 4 is a perspective view showing the inside of the housing in the cooling / heating switching device of the embodiment. FIG. 5 is a perspective view showing the inside of the housing in the cooling / heating switching device of the embodiment. FIG. 6 is a refrigerant circuit diagram showing a cooling / heating switching device of an embodiment. FIG. 7 is a front view showing a control unit of the cooling / heating switching device of the embodiment. FIG. 8 is a perspective view showing a state in which the power supply circuit board is rotated in the control unit of the cooling / heating switching device of the embodiment. FIG. 9 is a front view showing the support base of the control unit and the first substrate holder in the embodiment. FIG. 10 is a perspective view showing a first substrate holder of the control unit in the embodiment. FIG. 11 is a perspective view for explaining a main part of the first substrate holder in the embodiment. FIG. 12 is an enlarged perspective view showing a main part of the first substrate holder in the embodiment. FIG. 13 is an enlarged perspective view showing a main part of the support base in the embodiment.

Hereinafter, examples of the cooling / heating switching device disclosed in the present application will be described in detail with reference to the drawings. The cooling / heating switching device disclosed in the present application is not limited by the following examples.

(Configuration of air conditioner)
FIG. 1 is a schematic view showing an air conditioner including the cooling / heating switching device of the embodiment. As shown in FIG. 1, the cooling / heating switching device 1 of the embodiment is provided in the air conditioner 2. FIG. 1 is a schematic view showing an air conditioner 2 provided with the cooling / heating switching device 1 of the embodiment. The air conditioner 2 includes a cooling / heating switching device 1, a plurality of outdoor units 3-1 to 2-3, a plurality of indoor units 5-1 to 5-4, a low pressure gas pipe 6, a high pressure gas pipe 7, and the like. A liquid tube 8 is provided. Of the plurality of outdoor units 3-1 to 2-3, the outdoor unit 3-1 is connected to the cooling / heating switching device 1 via the low pressure gas pipe 6, the high pressure gas pipe 7, and the liquid pipe 8.

The outdoor unit 3-1 includes a compressor (not shown), an outdoor heat exchanger, and a four-way valve. One end of the compressor is connected to the low pressure gas pipe 6, and the other end of the compressor is connected to the high pressure gas pipe 7. The compressor generates a high-pressure gas-phase refrigerant by compressing the low-pressure gas-phase refrigerant supplied to the outdoor unit 3-1 via the low-pressure gas pipe 6, and discharges the high-pressure gas-phase refrigerant into the high-pressure gas pipe 7. One end of the outdoor heat exchanger is connected to the liquid pipe 8, and the other end of the outdoor heat exchanger is connected to the four-way valve. The four-way valve is connected to the high pressure gas pipe 7 and the low pressure gas pipe 6. The four-way valve is switched between a first mode and a second mode. When the four-way valve is switched to the first mode, the high pressure gas pipe 7 is connected to the indoor heat exchanger without connecting the low pressure gas pipe 6 to the high pressure gas pipe 7 and the indoor heat exchanger. When the four-way valve is switched to the second mode, the low pressure gas pipe 6 is connected to the indoor heat exchanger without connecting the high pressure gas pipe 7 to the low pressure gas pipe 6 and the indoor heat exchanger. Of the plurality of outdoor units 3-1 to 2-3, the outdoor unit 3-2, which is different from the outdoor unit 3-1 is also formed in the same manner as the outdoor unit 3-1. And is connected to the cooling / heating switching device 1 via the liquid pipe 8.

Further, the air conditioner 2 includes a plurality of indoor unit liquid pipes 11-1 to 11-4 and a plurality of indoor unit side gas pipes 12-1 to 12-4. The plurality of indoor unit liquid pipes 11-1 to 11-4 correspond to a plurality of indoor units 5-1 to 5-4. Of the plurality of indoor units 5-1 to 5-4, the indoor unit 5-1 is an indoor unit liquid pipe 11 corresponding to the indoor unit 5-1 of the plurality of indoor unit liquid pipes 11-1 to 11-4. It is connected to the cooling / heating switching device 1 via -1. The plurality of indoor unit side gas pipes 12-1 to 12-4 correspond to a plurality of indoor units 5-1 to 5-4. The indoor unit 5-1 is connected to the cooling / heating switching device 1 via the indoor unit side gas pipe 12-1 corresponding to the indoor unit 5-1 of the plurality of indoor unit side gas pipes 12-1 to 12-4. ing.

The indoor unit 5-1 includes an expansion valve and an indoor heat exchanger (not shown). One side of the expansion valve in the flow direction of the refrigerant is connected to the indoor unit liquid pipe 11-1, and the other side of the expansion valve is connected to one end of the indoor heat exchanger. The other end of the indoor heat exchanger is connected to the gas pipe 12-1 on the indoor unit side. The other indoor unit among the plurality of indoor units 5-1 to 5-4 is also formed in the same manner as the indoor unit 5-1 and is one of the plurality of indoor unit liquid pipes 11-1 to 11-4. It is connected to the cooling / heating switching device 1 via one of a plurality of indoor unit side gas pipes 12-1 to 12-4.

Further, when the air conditioner 2 is provided with 13 or more indoor units, the air conditioner 2 further includes another cooling / heating switching device 14, a low pressure gas pipe 15, a high pressure gas pipe 16, and a liquid pipe 17. Like the cooling / heating switching device 1, the cooling / heating switching device 14 is connected to the 13th and subsequent indoor units, and is connected to the cooling / heating switching device 1 via the low-pressure gas pipe 15, the high-pressure gas pipe 16, and the liquid pipe 17. There is. When 12 or less indoor units are used, the air conditioner 2 does not need to include the cooling / heating switching device 14, and the cooling / heating switching device 14, the low-pressure gas pipe 15, the high-pressure gas pipe 16, and the liquid pipe 17 may be omitted. ..

(Configuration of cooling / heating switching device)
FIG. 2 is a perspective view showing the cooling / heating switching device 1 of the embodiment. FIG. 3 is a perspective view showing the cooling / heating switching device 1 of the embodiment from below. 4 and 5 are perspective views showing the inside of the housing in the cooling / heating switching device 1 of the embodiment.

As shown in FIGS. 2 to 5, the cooling / heating switching device 1 includes a plurality of indoor units 5-1 to 5-4 (hereinafter, also referred to as indoor units 5) and two outdoor units as at least one outdoor unit. A plurality of refrigerant pipes 30 (see FIGS. 5 and 6) connected to 3-1 and 3-2 (hereinafter, also referred to as an outdoor unit 3) and a plurality of on-off valves 31 to provided in the plurality of refrigerant pipes 30. A piping unit 51 having 34 and 34 is provided. Further, the cooling / heating switching device 1 includes a drive unit 52 having a plurality of opening / closing mechanisms 53 (see FIG. 4) for opening / closing the plurality of opening / closing valves 31 to 34, and a control unit 54 (FIG. 2) for controlling the plurality of opening / closing mechanisms 53. 3), and a housing 55 in which the piping unit 51, the drive unit 52, and the control unit 13 are housed. The drive unit 52 refers to the entire plurality of opening / closing mechanisms 53 housed in the mechanism accommodating space 56B described later in the housing 55.

As shown in FIGS. 4 and 5, the piping section 51 has a plurality of piping groups 24-1 to 24-12 corresponding to each of the 12 indoor units 5. Of the plurality of pipe groups 24-1 to 24-12, the pipe group 24-1 includes a plurality of refrigerant pipes 30, a plurality of on-off valves 31 to 34, and a plurality of capillary tubes 35 to 36 (FIG. 6). 6). Further, the same applies to the plurality of pipe groups 24-2 to 24-12 as in the pipe group 24-1. In the piping section 51, two refrigerant pipes 30 are connected to each indoor unit 5, and the two refrigerant pipes 30 (see the broken lines in FIGS. 4 and 5) are connected to one outdoor unit 3. It is connected to the connected outdoor unit side low pressure gas pipe 21 and the outdoor unit side high pressure gas pipe 22. The outdoor unit side liquid pipe 23 is arranged so as to pass through the piping portion 51. In the two refrigerant pipes 30 connected to one indoor unit 5, a total of four on-off valves 31 to 34 are discharged valves for adjusting the flow and pressure of the refrigerant in one refrigerant circulation circuit (refrigerant cycle). , As a suction valve, a pressure valve, and a pressure reducing valve. The on-off valves 31 to 34 are so-called solenoid valves, and are opened and closed by the electromagnetic coil 53b of the on-off mechanism 53.

The drive unit 52 has four opening / closing mechanisms 53 (see FIG. 4) for each indoor unit 5, and has a total of 48 opening / closing mechanisms 53. As shown in FIG. 4, each opening / closing mechanism 53 has a drive shaft 53a for operating the on-off valves 31 to 34 and an electromagnetic coil 53b, and is electrically connected to the control unit 54 via the electromagnetic coil 53b. There is.

In the housing 55, the piping accommodating space 56A in which the refrigerant pipe 30 and the on-off valves 31 to 34 are accommodated, the mechanism accommodating space 56B in which the on-off mechanism 53 is accommodated, and the substrate accommodating space 56C described later are independent of each other. It is partitioned and provided. As shown in FIGS. 2 and 3, the housing 55 has one side surface portion 55a which is a partition wall that separates the substrate accommodating space 56C and the mechanism accommodating space 56B. Further, the housing 55 has a lid 57 (see FIGS. 2 and 3) that can open and close the substrate accommodating space 56C. The lid 57 is detachably provided with respect to the housing 55, and is fixed to the housing 55 by a fastening member (not shown) such as a screw.

FIG. 6 is a refrigerant circuit diagram showing a cooling / heating switching device of an embodiment. As shown in FIG. 6, the cooling / heating switching device 1 includes an outdoor unit side low pressure gas pipe 21, an outdoor unit side high pressure gas pipe 22, an outdoor unit side liquid pipe 23, and a plurality of pipe groups 24-1 to 24-12. , A plurality of indoor unit side gas pipes 25-1 to 25-12, and a plurality of indoor unit side liquid pipes 26-1 to 26-12. The low pressure gas pipe 21 on the outdoor unit side is connected to the low pressure gas pipe 6. The outdoor unit side high pressure gas pipe 22 is connected to the high pressure gas pipe 7. The outdoor unit side liquid pipe 23 is connected to the liquid pipe 8. The plurality of indoor unit side gas pipes 25-1 to 25-12 correspond to a plurality of pipe groups 24-1 to 24-12. The plurality of indoor unit side liquid pipes 26-1 to 26-12 correspond to a plurality of pipe groups 24-1 to 24-12.

Of the plurality of pipe groups 24-1 to 24-12, in the pipe group 24-1, the plurality of on-off valves 31 to 34 and the plurality of capillary tubes 35 to 36 are connected to each other via the plurality of refrigerant pipes 30. There is. That is, of the plurality of on-off valves 31 to 34, one side of the first on-off valve 31 in the flow direction of the refrigerant is connected to the low-pressure gas pipe 21 on the outdoor unit side, and the other side of the first on-off valve 31 is plural. It is connected to the indoor unit side gas pipe 25-1 corresponding to the pipe group 24-1 of the indoor unit side gas pipes 25-1 to 25-12. Of the plurality of on-off valves 31 to 34, one side of the second on-off valve 32 in the flow direction of the refrigerant is connected to the high-pressure gas pipe 22 on the outdoor unit side, and the other side of the second on-off valve 32 is on the indoor unit side. It is connected to the gas pipe 25-1. Of the plurality of on-off valves 31 to 34, one side of the third on-off valve 33 in the flow direction of the refrigerant is connected to the low-pressure gas pipe 21 on the outdoor unit side, and the other side of the third on-off valve 33 is the first capillary. It is connected to one end of the tube 35. Of the plurality of on-off valves 31 to 34, one side of the fourth on-off valve 34 in the flow direction of the refrigerant is connected to the outdoor unit side high-pressure gas pipe 22, and the other side of the fourth on-off valve 34 is the first capillary. It is connected to one end of the tube 35. The other end of the first capillary tube 35 is connected to the gas pipe 25-1 on the indoor unit side. One end of the second capillary tube 36 is connected to one side of the first on-off valve 31 in the flow direction of the refrigerant, and the other end of the second capillary tube 36 is connected to the other side of the first on-off valve 31. There is.

Other pipe groups 24-2 to 24 to 12, which are different from the pipe group 24-1 among the plurality of pipe groups 24-1 to 24-12, are also formed in the same manner as the pipe group 24-1. For example, the pipe group 24-12 of the plurality of pipe groups 24-1 to 24-12 includes a plurality of on-off valves 31 to 34 and a plurality of capillary tubes 35 to 36. The pipe group 24-12 is connected to the indoor unit side gas pipe 25-12 corresponding to the pipe group 24-12 among the plurality of indoor unit side gas pipes 25-1 to 25-12.

The plurality of indoor unit side gas pipes 25-1 to 25-12 correspond to the plurality of indoor units 5-1 to 5-4. For example, the indoor unit side gas pipe 25-1 corresponding to the indoor unit 5-1 of the plurality of indoor unit side gas pipes 25-1 to 25-12 is connected to the indoor unit side gas pipe 12-1. , Is connected to the indoor unit 5-1 via the gas pipe 12-1 on the indoor unit side. The indoor unit side gas pipe 25-2 corresponding to the indoor unit 5-2 of the plurality of indoor unit side gas pipes 25-1 to 25-12 is connected to the indoor unit side gas pipe 12-2 and is indoors. It is connected to the indoor unit 5-2 via the gas pipe 12-2 on the machine side. The indoor unit side gas pipe 25-3 corresponding to the indoor unit 5-3 among the plurality of indoor unit side gas pipes 25-1 to 25-12 is connected to the indoor unit side gas pipe 12-3 and is indoors. It is connected to the indoor unit 5-3 via the machine side gas pipe 12-3. Of the plurality of indoor unit side gas pipes 25-1 to 25-12, the indoor unit side gas pipe 25-4 corresponding to the indoor unit 5-4 is connected to the indoor unit side gas pipe 12-4 and is indoors. It is connected to the indoor unit 5-4 via the machine side gas pipe 12-4.

Each of the plurality of indoor unit side liquid pipes 26-1 to 26-12 is connected to the outdoor unit side liquid pipe 23. The plurality of indoor unit side liquid pipes 26-1 to 26-12 correspond to the plurality of indoor units 5-1 to 5-4. For example, the indoor unit side liquid pipe 26-1 corresponding to the indoor unit 5-1 of the plurality of indoor unit side liquid pipes 26-1 to 26-12 is connected to the indoor unit liquid pipe 11-1. It is connected to the indoor unit 5-1 via the indoor unit liquid pipe 11-1. The indoor unit side liquid pipe 26-2 corresponding to the indoor unit 5-2 of the plurality of indoor unit side liquid pipes 26-1 to 26-12 is connected to the indoor unit liquid pipe 11-2 and is connected to the indoor unit liquid pipe 11-2. It is connected to the indoor unit 5-2 via the liquid pipe 11-2. The indoor unit side liquid pipe 26-3 corresponding to the indoor unit 5-3 among the plurality of indoor unit side liquid pipes 26-1 to 26-12 is connected to the indoor unit liquid pipe 11-3 and is connected to the indoor unit liquid pipe 11-3. It is connected to the indoor unit 5-3 via the liquid pipe 11-3. Of the plurality of indoor unit side liquid pipes 26-1 to 26-12, the indoor unit side liquid pipe 26-4 corresponding to the indoor unit 5-4 is connected to the indoor unit liquid pipe 11-4, and is connected to the indoor unit liquid pipe 11-4. It is connected to the indoor unit 5-4 via the liquid pipe 11-4.

The low-pressure gas pipe 21 on the outdoor unit side of the cooling / heating switching device 1 is connected to the low-pressure gas pipe 15 when the air conditioner 2 includes another cooling / heating switching device, and the cooling / heating switching device 14 is connected via the low-pressure gas pipe 15. It is connected to the low pressure gas pipe 21 on the outdoor unit side of the above. At this time, the outdoor unit side high pressure gas pipe 22 of the cooling / heating switching device 1 is connected to the high pressure gas pipe 16 and is connected to the outdoor unit side high pressure gas pipe 22 of the cooling / heating switching device 14 via the high pressure gas pipe 16. There is. The outdoor unit side liquid pipe 23 of the cooling / heating switching device 1 is connected to the liquid pipe 17, and is connected to the outdoor unit side liquid pipe 23 of the cooling / heating switching device 14 via the liquid pipe 17. That is, the outdoor unit side low pressure gas pipe 21, the outdoor unit side high pressure gas pipe 22, and the outdoor unit side liquid pipe 23 of the cooling / heating switching device 14 are connected to the low pressure gas pipe 6, the high pressure gas pipe 7, and the liquid via the cooling / heating switching device 1. Each is connected to a tube 8. Further, the cooling / heating switching device 14 is provided via the plurality of indoor unit side gas pipes 25-1 to 25-12 and the plurality of indoor unit side liquid pipes 26-1 to 26-12, similarly to the cooling / heating switching device 1. , It is connected to the 13th and subsequent indoor units.

(Structure of control unit)
Hereinafter, the configuration of the control unit 54, which is the main unit in this embodiment, will be described. FIG. 7 is a front view showing the control unit 54 of the cooling / heating switching device 1 of the embodiment. FIG. 8 is a perspective view showing a state in which the power supply circuit board is rotated in the control unit 54 of the cooling / heating switching device 1 of the embodiment.

As shown in FIGS. 7 and 8, the control unit 54 includes a plurality of control circuit boards 61 for controlling the plurality of opening / closing mechanisms 53, and a plurality of power supply circuit boards 62 for supplying electric power to the plurality of opening / closing mechanisms 53. It has a substrate accommodating space 56C provided in the housing 55 and accommodating a plurality of control circuit boards 61 and a plurality of power supply circuit boards 62. A part of the housing 55 is formed as a so-called electrical component box for accommodating the control circuit board 61 and the power supply circuit board 62, and a substrate accommodating space 56C is provided inside the electrical component box.

As shown in FIG. 7, in the board accommodation space 56C, six control circuit boards 61 are arranged side by side along one direction A, and three power supply circuit boards 62 are laminated on the six control circuit boards 61. The control circuit boards 61 are arranged side by side along the arrangement direction. As shown in FIG. 7, in the substrate accommodating space 56C, three power supply circuit boards 62 are laminated on the six control circuit boards 61 and arranged along one direction A. In this embodiment, the control circuit board 61 and the power supply circuit board 62 are formed in a rectangular shape, and the control circuit boards 61 are arranged along the short side direction. The power supply circuit boards 62 are arranged along the long side direction.

Further, in the above-mentioned one direction A, one power supply circuit board 62 is stacked and arranged so as to straddle the two control circuit boards 61. In other words, when viewed from the thickness direction of the control circuit board 61, one power supply circuit board 62 is arranged so as to overlap at least a part of the two control circuit boards 61, and the control unit 54 has a so-called two-stage support structure. Have. Here, "lamination" refers to a structure in which the power supply circuit board 62 is arranged via a support structure (for example, a support base 65 described later) so as to leave a space above the control circuit board 61, but the control circuit. A simple laminated structure in which the power supply circuit board 62 is directly stacked on the board 61 is also included. In one direction A, one power supply circuit board 62 may be laminated across three or more control circuit boards 61.

In this embodiment, for example, one control circuit board 61 controls each on-off mechanism 53 of each on-off valve 31 to 34 corresponding to the two indoor units 5. The opening / closing mechanism 53 of each on-off valve 31 to 34 corresponding to the two indoor units 5 refers to a total of eight opening / closing mechanisms 53 in the four refrigerant pipes 30 connected to each of the two indoor units 5. One control circuit board 61 is configured to be able to control eight opening / closing mechanisms 53. One power supply circuit board 62 supplies electric power to each on-off mechanism 53 of each on-off valve 31 to 34 corresponding to the four indoor units 5. The opening / closing mechanism 53 of each on-off valve 31 to 34 corresponding to the four indoor units 5 refers to a total of 16 opening / closing mechanisms 53 in the eight refrigerant pipes 30 connected to each of the four indoor units 5. One power supply circuit board 62 is configured to be able to supply electric power to a total of 16 opening / closing mechanisms 53. The number of opening / closing mechanisms 53 controlled by the control circuit board 61 and the number of opening / closing mechanisms 53 to which the power supply circuit board 62 supplies electric power are not limited to the above-mentioned numbers, and are, for example, the number of indoor units 5 and the control circuit. It may be arbitrarily changed according to the arrangement of the board 61 and the power supply circuit board 62 and the like.

As described above, in the control unit 54, the circuit board for controlling the drive unit 52 is divided into a control circuit board 61 and a power supply circuit board 62, and the control circuit board 61 and the power supply circuit board 62 have a two-stage structure. By being supported by, the substrate accommodating space 56C is effectively used, and the control unit 54 is downsized. Further, the control unit 54 can reduce the number of power supply circuit boards 62 by arranging one power supply circuit board 62 straddling the two control circuit boards 61.

FIG. 9 is a front view showing the support base of the control unit 54 and the first substrate holder in the embodiment. FIG. 10 is a perspective view showing a first substrate holder of the control unit 54 in the embodiment. As shown in FIGS. 8, 9 and 10, the control unit 54 includes a plurality of first board holders 63 that support each of the plurality of control circuit boards 61, and a plurality of control units 54 that support each of the plurality of power supply circuit boards 62. Second board holder 64 and a support base 65 that supports a plurality of second board holders 64, that is, supports a plurality of power supply circuit boards 62. The "board holder" included in the features of the present disclosure refers to the "first board holder 63" that supports the control circuit board 61.

FIG. 11 is a perspective view for explaining a main part of the first substrate holder 63 in the embodiment. As shown in FIGS. 10 and 11, the first substrate holder 63 is a first engaging portion that engages with a recess 71 that supports the entire control circuit board 61 and one side surface portion 55a of the housing 55. It has an engaging claw 72 and a fixing portion 73 fixed to one side surface portion 55a of the housing 55 by a fastening member such as a screw.

A plurality of holding claws 71a for holding the outer peripheral portion of the control circuit board 61 are formed on the inner wall of the recess 71. On the bottom surface of the recess 71, a plurality of columnar support protrusions 71b that support the back surface of the control circuit board 61 are formed at predetermined intervals.

FIG. 12 is an enlarged perspective view showing a main part of the first substrate holder 63 in the embodiment. As shown in FIGS. 11 and 12, the first engaging claw 72 is provided at one end 63a of the first substrate holder 63, and is formed so as to project from one end 63a in a direction along the bottom surface of the recess 71. .. Two first engaging claws 72 are provided at one end 63a of the first substrate holder 63 at intervals. The first engaging claw 72 is formed in a rectangular plate shape, and projects from one end 63a along the short side direction of the rectangle.

The fixing portion 73 is provided at one end 63a of the first substrate holder 63 with the control circuit board 61 supported by the first substrate holder 63 sandwiched between the one end 63a and the other end 63b on the opposite side of the one end 63a. The fixing portion 73 is formed so as to project from the other end 63b of the first substrate holder 63 in a direction along the bottom surface of the recess 71, and has a fixing hole 73a through which a fastening member such as a screw is passed. The fixing portion 73 is located between the two first engaging claws 72 in the direction along the other end 63b of the first substrate holder 63. As a result, the first substrate holder 63 is stably fixed on the one side surface portion 55a by the two first engaging claws 72 and the fixing portion 73.

Therefore, by engaging the first engaging claw 72 with the first opening 76 of the one side surface portion 55a and fixing the fixing portion 73 to the one side surface portion 55a with one screw or the like, the first substrate holder 63 becomes one. It is easily and stably fixed to the side surface portion 55a. In this way, the number of fixing portions 73 fixed to the first board holder 63 with screws or the like is reduced, and the work for fixing the first board holder 63 is simplified.

Further, the fixing portion 73 is arranged outside the power supply circuit board 62 laminated on the control circuit board 61 when viewed from the thickness direction of the control circuit board 61. That is, the fixing portion 73 is not hidden by the power supply circuit board 62, and the screw or the like for fixing the fixing portion 73 is operated while the support base 65 supporting the power supply circuit board 62 is fixed to the one side surface portion 55a. It is possible to do. The first board holder 63 can be removed from the one side surface portion 55a by removing screws or the like from the fixing portion 73 without removing the support base 65 that supports the power supply circuit board 62 from the one side surface portion 55a. .. Further, in this embodiment, since the power supply circuit board 62 is laminated on the control circuit board 61 by being supported by the support base 65, the fixed portion 73 is viewed from the thickness direction of the control circuit board 61. It protrudes from the support base 65, and the fixing portion 73 is arranged outside the support base 65. As a result, since the fixed portion 73 is not hidden by the support base 65, it is possible to secure the operability of the screws and the like of the fixed portion 73 when maintaining the control unit 54, and the workability for maintaining the control unit 54 is improved. improves.

Like the first board holder 63, the second board holder 64 has a recess for supporting the power supply circuit board 62 (not shown), and is fixed on a support base 65, which will be described later, by a fastening member such as a screw. To. A plurality of holding claws for holding the outer peripheral portion of the power supply circuit board 62 are formed on the inner wall of the recess. On the bottom surface of the recess, a plurality of columnar support protrusions that support the back surface of the power supply circuit board 62 are formed at predetermined intervals. Further, the first substrate holder 63 and the second substrate holder 64 are formed of, for example, a resin material such as ABS resin.

One side surface portion 55a of the housing 55 has a first opening 76 with which the first engaging claw 72 of the first substrate holder 63 is engaged, and two first engaging claws 72 of the first substrate holder 63. Two first openings 76 are formed corresponding to. The first opening 76 is formed as a square hole into which the first engaging claw 72 can be inserted. The first substrate holder 63 in which the first engaging claw 72 is engaged with the first opening 76 is fixed along one side surface portion 55a of the housing 55.

The first substrate holder 63 has one side surface of the housing 55 like a so-called hinge structure, with the contact point between the first engaging claw 72 engaged with the first opening 76 and the first opening 76 as the center of rotation. The first substrate holder 63 can be rotated with respect to the portion 55a. Here, the direction in which the first substrate holder 63 rotates refers to the direction in which the other end 63b of the first substrate holder 63 comes into contact with or separates from the one side surface portion 55a. By inserting the rectangular plate-shaped first engaging claw 72 into the first opening 76 which is a square hole, the other end 63b of the first substrate holder 63 is on one side surface with the first engaging claw 72 as the center of rotation. It is easy to rotate in the direction of contacting and separating from the portion 55a. On the other hand, in the in-plane direction along the one side surface portion 55a (on the one side surface portion 55a), the swing of the first substrate holder 63 with the first engaging claw 72 as the center of rotation is suppressed. Further, in the first substrate holder 63, the two first engaging claws 72 are engaged with the two first openings 76, so that the first engaging claw 72 is in the in-plane direction along the one side surface portion 55a. The swing of the first substrate holder 63 around the center of rotation to both sides is regulated.

FIG. 13 is an enlarged perspective view showing a main part of the support base 65 in the embodiment. As shown in FIGS. 7, 8 and 9, the support base 65 is provided on both sides of the support portion 65a for supporting the plurality of power supply circuit boards 62 and the support portion 65a on one side surface portion 55a of the housing 55. It has a pair of supported legs 65b. The support portion 65a is arranged so as to be laminated on the plurality of control circuit boards 61 so as to straddle the plurality of control circuit boards 61. The support base 65 is formed of, for example, a metal material, and the support portion 65a is formed in a flat plate shape. As shown in FIGS. 7, 9 and 13, each leg portion 65b has a second engaging claw 77 as a second engaging portion that engages with one side surface portion 55a of the housing 55. The second engaging claw 77 is formed in a rectangular plate shape, and protrudes from the leg portion 65b along the short side direction of the rectangle. In the support base 65, each leg portion 65b is fixed to one side surface portion 55a by a fastening member such as a screw in a state where the second engaging claw 77 is engaged with the second opening 78 described later.

As shown in FIG. 13, one side surface portion 55a of the housing 55 has a second opening 78 to which the second engaging claw 77 of the leg portion 65b engages, and two second engagements of the support base 65. Two second openings 78 are formed so as to correspond to the joint claw 77. The second opening 78 is formed as a square hole into which the second engaging claw 77 can be inserted. The support base 65 has one side surface portion 55a of the housing 55 like a so-called hinge structure with the contact point between the second engaging claw 77 engaged with the second opening 78 and the second opening 78 as the center of rotation. It is possible to rotate the support base 65 with respect to the support base 65. Here, the direction in which the support base 65 rotates refers to the direction in which each leg portion 65b comes into contact with or separates from the one side surface portion 55a. By inserting the rectangular plate-shaped second engaging claw 77 into the second opening 78 which is a square hole, each leg portion 65b of the support base 65 has one side surface portion with the second engaging claw 77 as the center of rotation. It is easy to rotate in the direction of contacting and separating from 55a. On the other hand, in the in-plane direction along the one side surface portion 55a (on the one side surface portion 55a), the swing of the leg portion 65b centered on the second engaging claw 77 to both sides is suppressed. Further, the support base 65 has a second engagement in the in-plane direction along the one side surface portion 55a by engaging the two second engaging claws 77 of each leg portion 65b with the two second openings 78. The swing of the support base 65 centered on the joint claw 77 to both sides is regulated.

Further, in one side surface portion 55a of the housing 55, the second opening 78 is arranged on the one end 63a side in the direction extending from one end 63a of the first substrate holder 63 to the other end 63b. That is, the second engaging claw 77 of the support base 65 is located on the same side as the first engaging claw 72 of the first substrate holder 63 and the one side surface portion 55a. As a result, the support base 65 of the power supply circuit board 62 that rotates around the second engaging claw 77 and the first board holder 63 of the control circuit board 61 that rotates around the first engaging claw 72 are in the same direction. It becomes possible to rotate the control unit 54, and the workability for maintaining the control unit 54 is improved.

(Maintenance of control circuit board and power supply circuit board)
The disassembly operation for maintaining the control circuit board 61 and the power supply circuit board 62 will be described with respect to the control unit 54 configured as described above. First, the substrate accommodating space 56C is opened by removing the lid 57 from the housing 55. By opening the board accommodating space 56C, it becomes possible to maintain the plurality of power supply circuit boards 62. For example, when the power supply circuit board 62 is replaced, the power supply circuit board 62 is removed from the second board holder 64 fixed on the support base 65 and replaced.

Next, when the control circuit board 61 is maintained, the screws and the like for fixing the legs 65b of the support base 65 are removed so that the legs 65b can be separated from the one side surface portion 55a. Subsequently, in a state where the second engaging claw 77 of the leg portion 65b is engaged with the second opening 78, the entire support base 65 is separated from the one side surface portion 55a as shown in FIG. Is rotated with respect to one side surface portion 55a, so that the control circuit board 61 hidden below the support base 65 appears. This makes it possible to maintain the plurality of control circuit boards 61 fixed to the one side surface portion 55a without removing the support bases 65 that support the plurality of power supply circuit boards 62 from the housing 55.

Further, for example, when the control circuit board 61 is replaced, the control circuit board 61 is removed from the first board holder 63 fixed to the one side surface portion 55a and replaced. Alternatively, a screw or the like is removed from the fixing portion 73 of the first substrate holder 63, and the first substrate holder 63 is separated from the one side surface portion 55a with the first engaging claw 72 engaged with the first opening 76 as the center of rotation. The first substrate holder 63 can be easily removed from the one side surface portion 55a by rotating and pulling out the first engaging claw 72 from the first opening 76.

In order to remove the first board holder 63 in this way, the fixed portion 73 of the first board holder 63 can be visually recognized from the outside of the support base 65 fixed to the one side surface portion 55a, and the support base 65 is on one side surface. The operation of attaching / detaching a screw or the like to / from the fixing portion 73 while being fixed to the portion 55a can be easily performed. Then, the support base 65 is fixed to the one side surface portion 55a so that the first substrate holder 63 can be appropriately rotated in order to remove the first substrate holder 63 from the one side surface portion 55a. A predetermined gap is secured above the substrate holder 63 and is fixed to the one side surface portion 55a.

Further, when the first substrate holder 63 is fixed to the one side surface portion 55a, the direction in which the first engaging claw 72 protrudes when the first engaging claw 72 is hooked on the first opening 76 is directed to the one side surface portion 55a. The first engaging claw 72 is inserted into the first opening 76 in a posture inclined so as to form an acute angle. As a result, the first substrate holder 63 is temporarily fixed to the one side surface portion 55a, and then the fixing portion 73 is fixed to the one side surface portion 55a by being fixed with screws or the like.

In this embodiment, the first substrate holder 63 is provided with the first engaging claw 72, and the one side surface portion 55a of the housing 55 is provided with the first opening 76. However, contrary to this structure, A first opening may be provided in the first substrate holder 63, and a first engaging claw may be provided in one side surface portion 55a of the housing 55. Similarly, in the present embodiment, the leg portion 65b of the support base 65 is provided with the second engaging claw 77, and the one side surface portion 55a of the housing 55 is provided with the second opening 78. On the contrary, the leg portion 65b of the support base 65 may be provided with the second opening, and the one side surface portion 55a of the housing 55 may be provided with the second engaging claw.

(Operation of air conditioner 2)
When the indoor unit 5-1 is allowed to perform the cooling operation, the cooling / heating switching device 1 opens the first on-off valve 31 of the pipe group 24-1 corresponding to the indoor unit 5-1 and opens and closes the second on-off valve 31 of the pipe group 24-1-1. By closing the valve 32, the low pressure gas pipe 6 is connected to the indoor unit side gas pipe 12-1. At this time, the high-pressure liquid-phase refrigerant flowing through the liquid pipe 8 is supplied to the indoor unit 5-1 via the indoor unit liquid pipe 11-1, and is supplied from the indoor unit 5-1 to the indoor unit side gas pipe 12-1. The low-pressure gas phase refrigerant that flows out is supplied to the low-pressure gas pipe 6. When the indoor unit 5-1 is allowed to perform the heating operation, the cooling / heating switching device 1 closes the first on-off valve 31 of the pipe group 24-1 and opens the second on-off valve 32 of the pipe group 24-1-1. The high pressure gas pipe 7 is connected to the gas pipe 12-1 on the indoor unit side. At this time, the high-pressure gas phase refrigerant flowing through the high-pressure gas pipe 7 is supplied to the indoor unit 5-1 via the indoor unit side gas pipe 12-1, and the indoor unit 5-1 connects the indoor unit liquid pipe 11-1. The low-pressure two-phase refrigerant flowing out through the liquid pipe 8 is supplied to the liquid pipe 8.

In the third on-off valve 33 and the fourth on-off valve 34 of the piping group 24-1, the pressure of the refrigerant flowing through the piping group 24-1 is equalized when the first on-off valve 31 and the second on-off valve 32 open and close. That is, the first on-off valve 31 and the second on-off valve 32 are opened and closed appropriately. The cooling / heating switching device 1 also causes the other indoor units 15-2 to 15-4, which are different from the indoor units 5-1 of the plurality of indoor units 5-1 to 5-4, to perform the cooling operation or the heating operation. Similar to the pipe group 24-1, a plurality of pipe groups 24-1 to 24-12 are operated.

The indoor unit 5-1 is cooled by supplying a high-pressure liquid-phase refrigerant from the cooling / heating switching device 1 via the indoor unit liquid pipe 11-1. At this time, the expansion valve of the indoor unit 5-1 expands the high-pressure liquid-phase refrigerant supplied through the indoor unit liquid pipe 11-1 to generate a liquid-rich low-pressure two-phase refrigerant from the high-pressure liquid-phase refrigerant. To do. The indoor heat exchanger of the indoor unit 5-1 functions as a condenser. That is, the indoor heat exchanger cools the indoor air by exchanging heat between the low-pressure two-phase refrigerant and the indoor air, and raises the dryness of the low-pressure two-phase refrigerant while keeping the pressure of the low-pressure two-phase refrigerant constant. , A low-pressure gas-phase refrigerant in an overheated state is generated from the low-pressure two-phase refrigerant.

The indoor unit 5-1 is heated by supplying a high-pressure gas phase refrigerant from the cooling / heating switching device 1 via the gas pipe 12-1 on the indoor unit side. At this time, the indoor heat exchanger of the indoor unit 5-1 functions as a condenser. That is, the indoor heat exchanger heats the indoor air by exchanging heat between the high-pressure vapor phase refrigerant and the indoor air, cools the high-pressure vapor phase refrigerant while keeping the pressure of the high-pressure vapor phase refrigerant constant, and performs high pressure. It lowers the dryness of the gas phase refrigerant and produces a high pressure liquid phase refrigerant. The expansion valve of the indoor unit 5-1 expands the high-pressure liquid-phase refrigerant to generate a liquid-rich low-pressure two-phase refrigerant from the high-pressure liquid-phase refrigerant.

Of the plurality of indoor units 5-1 to 5-4, other indoor units different from the indoor unit 5-1 are also subjected to cooling operation and heating operation in the same manner as the indoor unit 5-1. ..

Further, in the four-way valve of the outdoor unit 3-1 of the plurality of outdoor units 3-1 to 2-3, the amount of the refrigerant used in the indoor unit in which the cooling operation is performed is the amount of the refrigerant used in the indoor unit in which the heating operation is performed. When the amount of refrigerant used is greater than the amount of refrigerant used, the mode is switched to the first mode. At this time, the low-pressure gas-phase refrigerant flowing through the low-pressure gas pipe 6 is supplied to the compressor, and the high-pressure gas-phase refrigerant compressed by the compressor of the outdoor unit 3-1 is supplied to the high-pressure gas pipe 7 and is a four-way valve. It is supplied to the outdoor heat exchanger via. The outdoor heat exchanger of the outdoor unit 3-1 operates as a condenser. That is, the outdoor heat exchanger exchanges heat between the high-pressure gas phase refrigerant supplied from the compressor of the outdoor unit 3-1 via the four-way valve and the outside air, so that the pressure of the high-pressure gas phase refrigerant remains constant and high pressure. It cools the gas phase refrigerant, lowers the dryness of the high pressure vapor phase refrigerant, and produces a high pressure liquid phase refrigerant. The high-pressure liquid-phase refrigerant is supplied to the liquid pipe 8. The compressor compresses the low-pressure gas-phase refrigerant flowing through the low-pressure gas pipe 6 and generates an overheated high-pressure gas-phase refrigerant from the low-pressure gas-phase refrigerant.

Further, in the four-way valve of one of the two outdoor units 3-1 to 3-2, the amount of the refrigerant used in the indoor unit in which the heating operation is performed is the amount of the refrigerant used in the indoor unit in which the cooling operation is performed. When the amount of refrigerant used in the machine is larger than the amount of refrigerant used, the mode is switched to the second mode. At this time, the low-pressure gas-phase refrigerant flowing through the low-pressure gas pipe 6 and the low-pressure gas-phase refrigerant generated by the outdoor heat exchanger are supplied to the compressor, and the high-pressure gas phase compressed by the compressor of the outdoor unit 3-1. The refrigerant is supplied to the outdoor heat exchanger via the four-way valve. The outdoor heat exchanger of the outdoor unit 3-1 operates as an evaporator. That is, the outdoor heat exchanger increases the dryness of the low-pressure two-phase refrigerant while keeping the pressure of the low-pressure two-phase refrigerant constant by exchanging heat between the low-pressure two-phase refrigerant flowing through the liquid pipe 8 and the indoor air, thereby increasing the dryness of the low-pressure two-phase refrigerant. A superheated low-pressure gas phase refrigerant is generated from the phase refrigerant. The compressor compresses the low-pressure gas-phase refrigerant supplied from the four-way valve and the low-pressure gas-phase refrigerant flowing through the low-pressure gas pipe 6 to generate an overheated high-pressure gas-phase refrigerant from the low-pressure gas-phase refrigerant, and produces a superheated high-pressure vapor refrigerant. Is supplied to the high-pressure gas pipe 7.

The other outdoor unit 3-2 of the plurality of outdoor units 3-1 to 3-2 also operates in the same manner as the outdoor unit 3-1.

(Effect of Examples)
As described above, the control unit 54 of the cooling / heating switching device 1 of the embodiment includes a plurality of control circuit boards 61 for controlling the plurality of opening / closing mechanisms 53, and a plurality of power supply circuit boards for supplying electric power to the plurality of opening / closing mechanisms 53. It has 62 and a substrate accommodating space 56C provided in the housing 55 and accommodating a plurality of control circuit boards 61 and a plurality of power supply circuit boards 62. In the board accommodation space 56C, a plurality of control circuit boards 61 are arranged along one direction A, and a plurality of power supply circuit boards 62 are laminated on the plurality of control circuit boards 61 and arranged along one direction A. Will be done. As a result, the control circuit board 61 and the power supply circuit board 62 for switching the on-off valves 31 to 34 of the refrigerant pipes 30 of the plurality of indoor units 5 can be aligned and efficiently arranged in the board accommodation space 56C. It will be possible. As a result, the aligned control circuit board 61 and the power supply circuit board 62 can be densely housed in the board accommodating space 56C and can be compactly accommodated. Can be achieved. Further, since the control circuit board 61 group can be arranged together as a control system and the power supply circuit board 62 group can be arranged together as a power supply system, it becomes easy to find a place to be maintained, and the maintainability of the control unit 54 becomes easy. Can be improved.

Further, in the cooling / heating switching device 1 of the embodiment, one control circuit board 61 controls a plurality of on-off valves 31 to 34 corresponding to at least two indoor units 5, and one power supply circuit board 62 has at least four. Power is supplied to a plurality of opening / closing mechanisms 53 that open / close a plurality of on-off valves 31 to 34 corresponding to the indoor unit 5, and one power supply circuit board 62 straddles at least two control circuit boards 61 in one direction A. Stacked. This makes it possible to reduce the number of control circuit boards 61 in the control unit 54 and further reduce the number of power supply circuit boards 62, reduce the size of the control unit 54, and reduce the size of the entire cooling / heating switching device 1. Can be done.

Further, the first substrate holder 63 of the control unit 54 of the cooling / heating switching device 1 of the embodiment is provided at one end 63a of the first substrate holder 63 and engages with one side surface portion 55a of the housing 55. The control circuit board 61 supported by the first board holder 63 is sandwiched between the 72 and the other end 63b on the opposite side of one end 63a, and is fixed to one side surface 55a of the housing 55 by a screw or the like. It has a part 73 and. One side surface portion 55a of the housing 55 has a first opening 76 to which the first engaging claw 72 of the first substrate holder 63 engages, and the first substrate holder 63 is fixed along the one side surface portion 55a. To. As a result, the first board holder 63 can be easily attached to and detached from one side surface portion 55a of the housing 55 simply by operating the screws or the like of the fixing portion 73, and the workability for maintaining the control portion 54 can be improved. it can.

Further, the first substrate holder 63 of the control unit 54 of the cooling / heating switching device 1 of the embodiment is arranged outside the power supply circuit board 62 when the fixing portion 73 is viewed from the thickness direction of the control circuit board 61. As a result, since the fixed portion 73 is not hidden by the power supply circuit board 62, it is possible to secure the operability of the screws and the like of the fixed portion 73 when maintaining the control unit 54, and the workability of maintaining the control unit 54 becomes possible. Can be further improved.

Further, the support base 65 of the control unit 54 of the cooling / heating switching device 1 of the embodiment is provided on both sides of the support portion 65a for supporting the plurality of power supply circuit boards 62 and the support portion 65a, and one side surface portion 55a of the housing 55. It has a leg portion 65b supported by the above. The leg portion 65b has a second engaging claw 77 that engages with one side surface portion 55a of the housing 55. One side surface portion 55a of the housing 55 has a second opening 78 to which the second engaging claw 77 of the leg portion 65b engages. As a result, the power supply circuit board 62 supported by the support base 65 can be rotated around the second engaging claw 77, and the control circuit board 61 can be rotated without removing the power supply circuit board 62 from the control unit 54. Since the maintenance work of the above can be performed, the workability of maintaining the control unit 54 can be further improved.

Further, the first substrate holder 63 of the control unit 54 of the cooling / heating switching device 1 of the embodiment is arranged outside the support base 65 when the fixing portion 73 is viewed from the thickness direction of the control circuit board 61. As a result, since the fixed portion 73 is not hidden by the support base 65, it is possible to secure the operability of the screws and the like of the fixed portion 73 when maintaining the control unit 54, and the workability for maintaining the control unit 54 is improved. It can be further improved.

Further, in the one side surface portion 55a of the housing 55 of the cooling / heating switching device 1 of the embodiment, the second opening 78 is arranged on the one end 63a side in the direction extending from one end 63a to the other end 63b of the first substrate holder 63. .. That is, the second engaging claw 77 of the support base 65 is located on the same side as the first engaging claw 72 of the first substrate holder 63 and the one side surface portion 55a. As a result, the support base 65 of the power supply circuit board 62 that rotates around the second engaging claw 77 and the first board holder 63 of the control circuit board 61 that rotates around the first engaging claw 72 are in the same direction. Since it is possible to rotate the control unit 54, the workability for maintaining the control unit 54 can be further improved.

1 Cooling / heating switching device 3 Outdoor unit 5 Indoor unit 30 Refrigerant piping 31 to 34 On / off valve 51 Piping part 52 Drive part 53 Opening / closing mechanism 54 Control part 55 Housing 55a One side surface 56C Board accommodation space 61 Control circuit board 62 Power supply circuit board 63 1st board holder (board holder)
63a One end 63b The other end 64 Second board holder 65 Support base 65a Support part 65b Leg part 72 First engagement claw (first engagement part)
73 Fixed part 76 1st opening 77 2nd engaging claw (2nd engaging part)
78 Second opening A One direction

Claims (7)

A piping unit having a plurality of refrigerant pipes connected to a plurality of indoor units and at least one outdoor unit, a plurality of on-off valves provided in the plurality of refrigerant pipes, and the plurality of on-off valves are opened and closed, respectively. A drive unit having a plurality of opening / closing mechanisms, a control unit for controlling the plurality of opening / closing mechanisms, and a housing in which the piping unit, the drive unit, and the control unit are housed are provided.
The control unit includes a plurality of control circuit boards for controlling the plurality of opening / closing mechanisms, a plurality of power supply circuit boards for supplying electric power to the plurality of opening / closing mechanisms, and the plurality of controls provided in the housing. It has a circuit board and a board accommodating space for accommodating the plurality of power supply circuit boards.
In the substrate accommodation space, the plurality of control circuit boards are arranged along one direction, and the plurality of power supply circuit boards are laminated on the plurality of control circuit boards and arranged along the one direction. Cooling / heating switching device. One control circuit board controls a plurality of on-off valves corresponding to at least two indoor units.
One power supply circuit board supplies electric power to the plurality of on-off mechanisms that open and close the plurality of on-off valves corresponding to at least four indoor units.
The cooling / heating switching device according to claim 1, wherein in the one direction, one power supply circuit board is laminated so as to straddle at least two control circuit boards. The control unit has a plurality of board holders that support each of the plurality of control circuit boards.
The substrate holder is provided at one end of the substrate holder and engages with one side surface portion of the housing, and the control circuit board supported by the substrate holder is sandwiched between the first engaging portion and the one end. It has a fixing portion provided at the other end on the opposite side of the housing and fixed to the one side surface portion of the housing by a fastening member.
The one side surface portion of the housing has a first opening in which the first engaging portion of the substrate holder engages, and the substrate holder is fixed along the one side surface portion of the housing. ,
The cooling / heating switching device according to claim 1 or 2. The fixing portion is arranged outside the power supply circuit board when viewed from the thickness direction of the control circuit board.
The cooling / heating switching device according to claim 3. The control unit has a support base that supports the plurality of power supply circuit boards.
The support base has a support portion that supports the plurality of power supply circuit boards, and legs that are provided on both sides of the support portion and are supported by the one side surface portion of the housing. Is stacked and arranged on the plurality of control circuit boards so as to straddle the plurality of control circuit boards.
The leg portion has a second engaging portion that engages with the one side surface portion of the housing.
The one side surface portion of the housing has a second opening in which the second engaging portion of the leg portion engages.
The cooling / heating switching device according to claim 3 or 4. The fixing portion is arranged outside the support base when viewed from the thickness direction of the control circuit board.
The cooling / heating switching device according to claim 5. In the one side surface portion of the housing, the second opening is arranged on the one end side in the direction extending from one end to the other end of the substrate holder.
The cooling / heating switching device according to claim 5 or 6.

Images