JP7020464B2 - Electrical components module - Google Patents

Description

The present invention relates to an electrical component module attached to a machine room at the back of a service panel in front of an outdoor unit of an air conditioner.

As shown in FIG. 12, a general air conditioner includes an outdoor unit 10 installed outdoors and an indoor unit 20 installed indoors. The outdoor unit 10 and the indoor unit 20 are connected by a refrigerant pipe 30 to form a steam compression type refrigeration cycle.

The outdoor unit 10 is supplied with lubricating oil from a mixed fluid of lubricating oil and refrigerant discharged from an outdoor heat exchanger 11, a blower fan 11F, a compressor 12 for compressing the refrigerant, and a compressor 12 for heat exchange between the outdoor air and the refrigerant. An oil separator 13 for separating, an expansion valve 14 for expanding the inflowing refrigerant to reduce the pressure to a predetermined pressure, an accumulator 15 for separating the inflowing refrigerant into gas and liquid, a four-way valve 16 for switching between heating operation and cooling operation, and the like are provided. There is. Further, the indoor unit 20 is provided with an indoor heat exchanger 21 for exchanging heat between indoor air and a refrigerant, a blower fan 21F, and the like. The refrigerant pipe 30 connects the outdoor heat exchanger 11, the compressor 12, the oil separator 13, the expansion valve 14, the accumulator 15, the four-way valve 16, and the indoor heat exchanger 21. The refrigerant pipe 30 includes a liquid-side refrigerant pipe 30L and a gas-side refrigerant pipe 30G.

As shown in FIG. 13, the outdoor unit 10 is divided into a heat exchanger room 10A and a machine room 10B in the left-right direction by a partition plate 171, and the heat exchanger room 10A has the above-mentioned outdoor heat. The exchanger 11 and the blower fan 11F are arranged. The above-mentioned compressor 12, oil separator 13, expansion valve 14, accumulator 15, four-way valve 16 and the like are housed in the machine room 10B, and these are service panels (not shown) on the front surface of the housing 17 as shown in FIG. By removing the, it becomes visible from the outside.

Further, in the machine room 10B, an electrical component module 40 is arranged at a substantially intermediate position in the vertical direction thereof. The electrical component module 40 includes a control circuit that controls the overall operation of the air conditioner, a setting circuit for making various settings of the air conditioner, a display circuit that displays the state of the air conditioner, and an AC supplied from the outside. It is a module equipped with a converter circuit that converts power into DC power and outputs it, an inverter circuit that converts DC power output from the converter circuit into AC power and outputs it, and other circuits. It is equipped with multiple electronic components to realize the circuit. The printed circuit board 41 is composed of one printed circuit board so as to secure a piping space on the back side of the machine room 10B.

FIG. 14 shows the front surface of the electrical component module 40. The printed circuit board 41 is mounted in the machine room 10B in an upright posture. The printed circuit board 41 is divided into a light electric region 41A and a high electric region 41B in the vertical direction.

In the light electric region 41A, electronic parts such as a microcomputer that constitutes a part of the control circuit described above, electronic parts for operating the switch 41A1 that constitutes the setting circuit, the low power connector 41A2 for inserting and removing the plug, and the display circuit The electronic components of the light electric system such as the LED 41A3 constituting the above are mounted. Further, in the high power region 41B, a plurality of electronic components of the high power system for performing power conversion constituting the rest of the control circuit described above, for example, a power device 41B1 such as an IC of a converter circuit and an IC of an inverter circuit, for smoothing. Parts such as a large-capacity electrolytic capacitor 41B2 and a high-power connector 41B3 are mounted.

Further, in the high electric region 41B, a cooler 50 for cooling the heat generated by the power device 41B1 is arranged. The cooler 50 includes a heat sink (not shown) having a shape that can be attached to the liquid side refrigerant pipe 30L of the refrigerant pipe 30. The heat sink is arranged on the front side of the printed circuit board 41, which is thermally coupled so as to transfer the heat generated by the power device 41B1, toward the service panel side (not shown). The refrigerant condensed by the outdoor heat exchanger 11 flows through the liquid side refrigerant pipe 30L during the cooling operation, and the refrigerant condensed by the indoor heat exchanger 21 and depressurized by the expansion valve 14 flows during the heating operation. The heat exchanger 50 is cooled, and the temperature of the power device 41B1 is kept below a predetermined value. The air conditioner described above is described in Patent Document 1.

Japanese Patent No. 5472364

However, in the above-mentioned outdoor unit 10, the weak electric electronic components are arranged in the light electric region 41A and the strong electric electronic components are arranged in the high electric region 41B, that is, they must be mounted side by side in the vertical direction on the same front surface of the printed circuit board 41. Therefore, there is a problem that the size of the printed circuit board 41 in the vertical direction becomes large, and the printed circuit board 41 cannot be applied to the outdoor unit 10 having a small margin in the vertical space of the machine room 10B. Therefore, it is conceivable to divide the printed circuit board 41 into two and mount and mount the two printed circuit boards separately on the front surface and the back surface of the fixing plate. However, if the vertical size of each is different, the printed circuit board 41 may be mounted. The advantage of using two sheets is lost. Further, since the cooler 50 is arranged on the front side of the electrical component module 40, a special device is required for attaching and detaching the electrical component module 40.

An object of the present invention is an electrical component that can be effectively applied to an outdoor unit having a housing having a small space in the vertical direction, can be easily attached to and detached from the machine room, and can be reduced in size in the vertical direction. To provide a module.

In order to achieve the above object, the electrical component module according to one aspect of the present disclosure is the electrical component module attached to the machine room behind the service panel in front of the outdoor unit of the air conditioner having the refrigerant pipe. The main board on which the electronic components that form part of the control circuit that controls the air conditioner are mounted on the front, and the electronic components that include the plurality of power devices that make up the rest of the control circuit are mounted on the front. The main board and the fixing plate on which the power board is mounted are provided so that the back surface of the main board faces the front surface and the back surface of the power board faces the back surface, and the main board is provided in the machine room. An electrical component module to which the fixing plate is attached so that the front surface of the substrate faces the service panel, and a long upper frame for attaching the upper portion of the fixing plate to the machine room, and the fixing plate. The outdoor unit is provided with a cooler attached to a part of the refrigerant pipe so that the lower part is provided with a long lower frame attached to the machine room, and the cooler straddles the upper frame and the lower frame. The plurality of power devices are vertically arranged in front of the power board and thermally coupled to the cooler, and the cooler abuts on the plurality of power devices among the coolers. The portion to be used is arranged so as to face the direction of the service panel, and the vertical size of the main board is set to the same size as the vertical size of the power board.

According to the present invention, the main board is mounted on the front surface of the fixed plate and the power board is mounted on the back surface of the fixed plate, and the vertical size of the power board corresponds to the vertical size of the vertical arrangement of a plurality of power devices. Since the vertical size of the main board is set corresponding to the vertical size of the power board, the vertical size can be significantly reduced compared to the case where one printed circuit board is used. Therefore, it can be effectively applied to an outdoor unit having a housing having a small space above and below the machine room. Further, the plurality of vertically arranged power devices mounted on the power board are thermally coupled to the cooler, so that they are effectively cooled. Further, since the cooler faces the service panel, the cooler does not interfere with the attachment / detachment of the electrical component module from the front of the machine room.

It is a perspective view of the outdoor unit of the Example of this invention. It is a perspective view of the outdoor unit with the service panel removed. It is a perspective view of the outdoor unit of the same outdoor unit with the electrical component module removed from the machine room. It is a developed perspective view of an electrical component module and a cooler. It is an installation explanatory view which attaches an upper frame and a lower frame to a partition plate. It is a vertical sectional view of an electrical component module. FIG. 6 is a cross-sectional view taken along the line AA of FIG. It is a top view which removed the top panel of an outdoor unit. It is the right side view which removed the right side panel of an outdoor unit. It is a front view of the main board. It is a front view of a power board. It is a circuit diagram of the refrigerant circuit of an air conditioner. It is a front view which removed the service panel of a conventional outdoor unit. It is a front view of the conventional electrical component module.

1 to 3, 8 and 9 show the outdoor unit 100 according to the embodiment of the present invention. The housing 110 of the outdoor unit 100 includes a front panel 111, a service panel 112 on the right side of the front panel 111, a right side panel 113, a left side panel 114, a top panel 115, a back panel 116, and a bottom panel 117. A stand 118 is attached to the bottom panel 117. The housing 110 is partitioned in the left-right direction by a partition plate 119 so that the back side of the front panel 111 becomes the heat exchanger room 110A and the back side of the service panel 112 becomes the machine room 110B. The partition plate 119 constitutes a part of the wall surface of the machine room 110B. The outdoor heat exchanger 11 and the blower fan 11F described above are arranged in the heat exchanger room 110A. Further, the above-mentioned refrigerant pipe 30, compressor 12, expansion valve 14, accumulator 15, sub-accumulator 15A, four-way valve 16 and the like are housed in the machine room 110B. The machine room 110B can be visually recognized from the front side of the outdoor unit 100 by removing the service panel 112.

Reference numeral 200 denotes an electrical component module, and as shown in FIGS. 4 to 9, a fixing plate 210 arranged in the machine room 110B so that the front surface faces the back surface of the service panel 112, and a length to which the upper portion of the fixing plate 210 is attached. A length-shaped upper frame 220, a long-shaped lower frame 230 to which the lower part of the fixing plate 210 is attached, a mounting bracket 240 for attaching the upper frame 220 to the partition plate 119, and a mounting bracket for attaching the lower frame 230 to the partition plate 119. The 250, the main board 260 on which the electronic components and other electronic components that form part of the control circuit are mounted, the electronic components and other electronic components that make up the rest of the control circuit, and a plurality of power devices described later. A power board 270 on which the 274 is mounted is provided.

In this way, the printed circuit board of the electrical component module 200 is divided into a main board 260 and a power board 270, and the main board 260 has a fixing plate 210 such that the back surface 260b described later faces the front surface 211a described later. The power board 270 is mounted on the fixing plate 210 so that the back surface 270b described later faces the back surface 211b described later on the fixing plate 210.

Reference numeral 300 denotes a cooler, which is attached to the upper frame 220 and the lower frame 230 so as to straddle the upper frame 220 and the lower frame 230 with the U-shaped bent portion 31 of the liquid side refrigerant pipe 30L attached as described later. It is attached.

The fixing plate 210 has a main body portion 211 in which the main board 260 is mounted on the front surface 211a and the power board 270 is mounted on the back surface 211b, and the fixing plate 210 is bent 90 degrees from the upper end of the main body portion 211 toward the back surface 211b for reinforcement. It includes an upper horizontal piece 212 and an upper vertical piece 213 for mounting that is bent 90 degrees upward from the rear end of the upper horizontal piece 212. Further, a reinforcing lower horizontal piece 214 bent 90 degrees from the lower end of the main body 211 toward the front surface 211a, and a lower vertical piece 215 bent 90 degrees downward from the front end of the lower horizontal piece 214. Be prepared. Mounting portions 215a projecting downward are formed at both ends of the lower vertical piece 215.

The upper frame 220 includes a vertical piece 221 screwed to the upper vertical piece 213 of the fixing plate 210, a reinforcing horizontal piece 222 bent 90 degrees rearward from the upper end of the vertical piece 221 and a vertical piece 221. It is provided with a mounting piece 223 bent at 45 degrees from the left end to the front. 224 is the end to which the cooler 300 is attached.

The lower frame 230 includes a lower vertical piece 231 screwed to the lower vertical piece 215 of the fixing plate 210, an upper horizontal piece 232 bent 90 degrees rearward from the upper end of the lower vertical piece 231, and an upper horizontal piece 232. It includes a reinforcing upper vertical piece 233 bent upward by 90 degrees from the back end, and a mounting piece 234 bent 45 degrees from the left end of the lower vertical piece 231 toward the front. A terminal board 400 is attached to the front side of the lower vertical piece 231. Reference numeral 235 is an end to which the cooler 300 is attached.

The cooler 300 includes an aluminum heat sink 310 thermally coupled to a plurality of power devices 274 mounted on the front surface 270a of the power substrate 270, which will be described later, and a semicircular cross section formed on the heat sink 310. It is composed of a U-shaped bent portion 31 of a liquid-side refrigerant pipe 30L fitted in the grooves 311 and a sheet metal cover 320 for fixing the U-shaped bent portion 31 to the heat sink 310. In addition to the groove 311 the heat sink 310 has a plate portion 312 to which the power device 274 is pressed and thermally coupled, and cover mounting portions 313 and 314 formed on both sides of the plate portion 312. The cover 320 has a central presser portion 321 that presses the U-shaped bent portion 31 of the liquid-side refrigerant pipe 30L, a hook portion 322 bent from one end of the presser portion 321 and a hook portion from the other end of the presser portion 321. It is provided with a holding portion 323 bent so as to face the 322.

As described above, electronic components and other electronic components that form a part of the control circuit are mounted on the front surface 260a of the main board 260. That is, as shown in FIG. 10, an AC input current detection / temperature detection circuit 261, an actuator drive circuit 262 for driving the expansion valve 14 and the four-way valve 16, an LED lamp 263a as a display, a dip switch 263b as an operation unit, and the like. Display setting circuit 263 including button switch 263c, main control IC 264 for microcomputers, EMC (ElectroMagnetic Compatibillity) filter circuit 265 including common mode choke coil 254a and capacitor 265b, and EMC (ElectroMagnetic Compatibillity) filter circuit 265, switching transformer 266a. , A switching power supply circuit 266 having a switching IC 266b, an inrush current control circuit 267, a plurality of connectors 268 arranged in a peripheral portion, and the like are mounted. 260b is the back surface of the main substrate 260. 260c is the upper end, 260d is the lower end, 260e is the left end, and 260f is the right end. The main board 260 is mounted on the front surface 211a so that the back surface 260b faces the front surface 211a of the main body portion 211 of the fixing plate 210.

On the front surface 270a of the power board 270, an electronic component including a plurality of power devices 274, which will be described later, constituting the remaining part of the control circuit as described above is mounted. That is, as shown in FIG. 11, a diode bridge circuit 271a for rectification, two IGBT (Insulated Gate Bipolar Transistor) elements 271b in which MOSFETs are incorporated in the gate portion of a bipolar transistor to reduce operating resistance, and two for high-speed operation. FRD (Fast Recovery Diode) element 271c, two PFC (Power Factor Correction) coils 271d for power factor improvement, two aluminum electrolytic capacitors 271e for high power smoothing, etc. are mounted. These diode bridge circuits 271a, IGBT elements 271b, FRD elements 271c, PFC coils 271d, aluminum electrolytic capacitors 271e and the like constitute a converter circuit 271 that converts and outputs AC power supplied from the outside. In addition, an IPM (Intelligent Power Module) element 272 and an inverter control IC 273 that form an inverter circuit that converts DC power supplied from the converter circuit 271 into AC power and outputs it by incorporating a drive circuit and self-protection function are also installed. There is. Reference numeral 270b is the back surface of the power substrate 270. 270c is the upper end, 270d is the lower end, 270e is the left end, and 270f is the right end. The diode bridge circuit 271a, IGBT element 271b, FRD element 271c, IPM element 272, etc. are power devices 274 that generate a large amount of heat, and are mounted in a vertical arrangement in the vicinity of the left end 270e so that they can be easily cooled by the cooler 300. ing. The power board 270 is mounted on the back surface 211b so that the back surface 270b faces the back surface 211b of the main body 211 of the fixing plate 210. The cooler 300 faces and abuts a portion of the plurality of power devices 274.

The vertical size of the power board 270 is set according to the size of the vertical arrangement of the plurality of power devices 274, and the PFC coil 271d, the aluminum electrolytic capacitor 271e, the inverter control IC 273, etc. are included in the size. Is placed. In this way, the vertical size of the power board 270 is set to a slightly larger size corresponding to the vertical size of the vertical arrangement of the plurality of power devices 274. The main board 260 is set to the same vertical size corresponding to the vertical size of the power board 270, and the AC input current detection / temperature detection circuit 261 and the actuator drive circuit 262 are displayed so as to be within the size. A setting circuit 263, a main control IC 264, an EMC filter circuit 265, a switching power supply circuit 266, an inrush current control circuit 267, a connector 268, and the like are mounted. The IGBT element 271b may be replaced with a MOSFET.

The electronic components mounted on the main board 260 and the power board 270 described above are merely examples, and can be changed without departing from the spirit of the present invention. Further, the electronic components mounted on the main board 260 are low-voltage electronic components that operate at a low voltage, and the electronic components mounted on the power board 270 are high-voltage electronic components that operate at a high voltage. High-power electronic components generate more heat than weak-power electronic components, and generate a large amount of noise.

In order to arrange the electrical component module 200 in the machine room 110B of the outdoor unit 100, first, a mounting bracket 240 having a slope 241 and a mounting bracket 250 having a slope 251 are previously mounted on the partition plate 119. Then, as shown in FIG. 5, the mounting piece 223 of the upper frame 220 is screwed to the slope 241 of the mounting bracket 240, and the mounting piece 234 of the lower frame 230 is screwed to the slope 251 of the mounting bracket 250. As a result, the upper frame 220 and the lower frame 230 are attached to the partition plate 119 in a cantilevered posture in a lateral position.

Next, as shown in FIG. 6, the heat sink 310 of the cooler 300 is screwed B1 so as to straddle between the end 224 of the vertical piece 221 of the upper frame 220 and the end 235 of the upper vertical piece 233 of the lower frame 230. , B2 to attach. Further, as shown in FIG. 7, after the U-shaped bent portion 31 of the liquid side refrigerant pipe 30L is pressed against the groove 311 of the heat sink 310, the hook portion 322 of the cover 320 is attached to one cover mounting portion 313 of the heat sink 310. The holding portion 323 is pressed against the other cover mounting portion 314 of the heat sink 310, and the holding portion 323 is fixed to the cover mounting portion 314 with screws B3 and B4. This work is performed with the back panel 116 of the outdoor unit 100 removed. As described above, the cooler 300 is attached so as to straddle between the end portion 224 of the upper frame 220 and the end portion 235 of the lower frame 230, and so that the plate portion 312 of the heat sink 310 faces the service panel 112. ..

Further, the main board 260 is mounted on the front 211a of the main body 211 of the fixed plate 210, and the power board 270 is mounted on the back 211b. Then, the fixing plate 210 on which the main board 260 and the power board 270 are mounted is fitted with the upper vertical piece 213 on the vertical piece 221 of the upper frame 220 and the lower vertical piece 215 on the lower vertical piece 231 of the lower frame 230. As shown, it is attached by screws B5 and B6. At this time, the mounting piece 223 of the upper frame 220 is attached to the partition plate 119 by the mounting bracket 240, and the mounting piece 234 of the lower frame 230 is attached to the partition plate 119 by the mounting bracket 250, respectively, and the end portion 224 and the lower frame of the upper frame 220 are attached. Since the end portion 235 of the 230 is fixed to the U-shaped bent portion 31 of the liquid side refrigerant pipe 30L by the cooler 300, the fixing plate 210 is firmly fixed. Further, the plurality of power devices 274 of the power substrate 270 are pressed against the thick plate portion 312 of the heat sink 310 of the cooler 300 so as to be thermally coupled there. Therefore, when the operation of the air conditioner is started, the heat generated in the power device 274 is cooled by the cooler 300. If a heat-dissipating grease having high thermal conductivity is applied to the thick plate portion 312 of the heat sink 310, the thermal coupling becomes better. After the electrical component module 200 is attached to the machine room 110B as described above, a plug to which the required wiring is connected is connected to the connector 268 of the main board 260 of the electrical component module 200, and the terminal board 400 is required. Another wire is connected.

As described above, in this embodiment, the main board 260 and the power board 270 are mounted on the fixed plate 210 with the fixed plates 210 attached to the machine chamber 110B interposed therebetween so that the main boards 260 and the power board 270 are mounted on the fixed plates 210 with their backs aligned. Compared to the vertical size of the printed circuit board when the main board 260 and the power board 270 are arranged one above the other, the vertical size of the printed circuit board can be significantly reduced, and there is little room for vertical space. It can be effectively applied to the outdoor unit having the above.

At this time, the vertical size of the power board 270 is set to a size corresponding to the vertical arrangement size of the plurality of power devices 274, and the main board 260 is also set to be the same as or substantially the same as the vertical size, and then a plurality. By distributing and mounting electronic components other than the power device 274 on the main board 260 and the power board 270, the vertical size of the main board 260 and the power board 270 can be reduced.

Further, the lower vertical piece 231 of the lower frame 230 projects toward the front side from the fixing plate 210 by the upper horizontal piece 232, and the terminal plate 400 is attached to the front surface 231a of the lower vertical piece 231 so that the terminal plate 400 protrudes forward. Since the space SP is wide on the back surface 231b of the lower vertical piece 231, the lower frame 230 does not interfere with the piping or the like arranged in the space SP.

Further, the plurality of power devices 274 mounted on the power board 270 are thermally coupled to the cooler 300 on the back surface 211b side of the fixing plate 210, but are only pressed against the cooler 300, so that the screws are used. If B5 and B6 are loosened, the fixing plate 210, the main board 260, and the power board 270 can be integrated and removed from the front of the machine room 110B without being disturbed by the cooler 300, and the main board 260 and the main board 260 can be removed. Maintenance of the power board 270 becomes easy.

Further, since the main board 260 is equipped with a display setting circuit 263 including an LED lamp 261a, a DIP switch 261b, a button switch 261c, and a plurality of connectors 268 on the front surface 260a, the outdoor unit 100 to the service panel 112 Just by removing, you can check the operation contents of the air conditioner by the display contents of the LED lamp 261a, change the setting contents by operating the DIP switch 261b, the button switch 261c, etc., or plug the connector to the connector 268. It becomes easy to switch the circuit connection by inserting and removing.

30L: Liquid side refrigerant piping, 31: U-shaped bent part 100: Outdoor unit, 110: Housing, 110A: Heat exchanger room, 110B: Machine room, 111: Front panel, 112: Service panel, 113: Right side Panel, 114: Left side panel, 115: Top panel, 116: Back panel, 117: Bottom panel, 118: Stand, 119: Partition plate 200: Electrical equipment module 210: Fixed plate, 211: Main body, 211a: Front , 211b: Back surface, 212: Upper horizontal piece, 213: Upper vertical piece, 214: Lower horizontal piece, 215: Lower vertical piece 220: Upper frame, 221: Vertical piece, 222: Horizontal piece, 223: Mounting piece 230: Lower Frame, 231: Lower vertical piece, 232: Upper horizontal piece, 233: Upper vertical piece, 234: Mounting piece 240: Mounting bracket 250: Mounting bracket 260: Main board, 260a: Front, 260b: Back side 270: Power board, 270a : Front, 270b: Back, 274: Power device 300: Cooler, 310: Heat sink, 320: Cover 400: Terminal plate

Claims (4)

In the electrical equipment module installed in the machine room at the back of the service panel in front of the outdoor unit of the air conditioner having the refrigerant piping.
The main board on which the electronic components that form part of the control circuit that controls the air conditioner are mounted on the front, and the electronic components that include the plurality of power devices that make up the rest of the control circuit are mounted on the front. The main board and the fixing plate on which the power board is mounted are provided so that the back surface of the main board faces the front surface and the back surface of the power board faces the back surface. An electrical component module to which the fixing plate is attached so that the front surface of the main board faces the service panel.
A long-shaped upper frame for attaching the upper part of the fixing plate to the machine room and a long-shaped lower frame for attaching the lower part of the fixing plate to the machine room are provided.
The outdoor unit includes a cooler attached to a part of the refrigerant pipe.
The cooler is mounted so as to straddle the upper frame and the lower frame.
The plurality of power devices are vertically arranged in front of the power board and thermally coupled to the cooler.
The cooler is arranged so that the portion of the cooler that comes into contact with the plurality of power devices faces the service panel.
An electrical component module characterized in that the vertical size of the main board is set to a size similar to the vertical size of the power board. In the electrical component module according to claim 1 ,
A partition plate that separates the heat exchanger room and the machine room is attached to the outdoor unit.
An electrical component module characterized in that one end of the upper frame and one end of the lower frame are attached to the partition plate, and the other end of the upper frame and the other end of the lower frame are attached to the cooler. In the electrical component module according to claim 2 ,
An electrical component module characterized in that the plurality of power devices are located between the other end of the upper frame and the other end of the lower frame. In the electrical component module according to claim 1, 2 or 3 .
The cooler is an electrical component module comprising a heat sink thermally coupled to the plurality of power devices and a cover for attaching the heat sink to a part of the refrigerant pipe.

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