JP2019203627A - Outdoor unit of air conditioner - Google Patents

Abstract

To provide an outdoor unit of an air conditioner which can prevent noise from being diffused via a cooler without connecting an earth cable between the cooler and a housing.SOLUTION: An electric component module 200 includes: a main substrate 260 on which electronic components including an EMC filter circuit are mounted; a power substrate 270 on which electronic components including a power device are mounted; a fixed plate 210 on which the main substrate 260 and the power substrate 270 are mounted; a conductive upper frame 220 and a conductive lower frame 230 which fix the fixed plate 210 to a partition plate; a conductive spacer 500; a conductive machine screw B7 which fixes the spacer 500 to an area between the fixed plate 210 and the main substrate 260; and a terminal board 400 including a ground terminal 401 connected to the lower frame 230 and mounted on the lower frame 230. The machine screw B7 is electrically connected to a ground pattern 260h of the EMC filter circuit in the main substrate 260, and the ground pattern 260h is electrically connected to the fixed plate 210 through the machine screw B7 and the spacer 500.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an outdoor unit of an air conditioner that cools a power device mounted on an electrical component module with a cooler.

  As shown in FIG. 13, a general air conditioner includes an outdoor unit 10 installed outside 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 vapor compression refrigeration cycle.

  The outdoor unit 10 receives lubricating oil from an outdoor heat exchanger 11 that exchanges heat between the outdoor air and the refrigerant, a blower fan 11F, a compressor 12 that compresses the refrigerant, and a mixed fluid of the lubricating oil and refrigerant discharged from the compressor 12. There are provided an oil separator 13 for separating, an expansion valve 14 for expanding the refrigerant flowing in to reduce the pressure to a predetermined pressure, an accumulator 15 for gas-liquid separation of the refrigerant flowing in, a four-way valve 16 for switching between heating operation and cooling operation, and the like. Yes. The indoor unit 20 is provided with an indoor heat exchanger 21 for exchanging heat between the indoor air and the 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. 14, in the outdoor unit 10, the inside of the housing 17 is partitioned into a heat exchanger chamber 10A and a machine chamber 10B in the left-right direction by a partition plate 171, and the outdoor heat described above is included in the heat exchanger chamber 10A. An exchanger 11 and a blower fan 11F are arranged. The machine room 10B accommodates the compressor 12, the oil separator 13, the expansion valve 14, the accumulator 15, the four-way valve 16 and the like described above. These are service panels (not shown) on the front surface of the housing 17 as shown in FIG. By removing, it is visible from the outside.

  In the machine room 10B, an electrical component module 40 is further arranged at a substantially intermediate position in the vertical direction. The electrical component module 40 includes a control circuit for controlling the overall operation of the air conditioner, a setting circuit for performing various settings of the air conditioner, a display circuit for displaying the state of the air conditioner, and an alternating current supplied from the outside. Converter circuit that converts electric power into DC power and outputs it, inverter circuit that converts DC power output from the converter circuit into AC power and outputs it, and noise generated inside electrical component module 40 is radiated to the outside And an EMC filter circuit for preventing noise coming from the outside from entering the interior of the electrical component module 40, and a plurality of components for realizing the circuits on the printed circuit board 41. Electronic components are mounted. The printed circuit board 41 is composed of a single sheet so that a piping space can be secured on the back side of the machine room 10B.

  FIG. 15 shows the front of the electrical component module 40. The printed circuit board 41 is attached in an upright posture in the machine room 10B. The printed circuit board 41 is divided into a low-power area 41A and a high-power area 41B in the vertical direction.

  In the upper light current area 41A, electronic parts such as a microcomputer constituting a part of the control circuit described above, electronic parts for operation such as a switch 41A1 constituting a setting circuit and a low power connector 41A2 for plugging / unplugging, A weak electric system electronic component such as the LED 41A3 constituting the display circuit, an electronic component constituting the EMC filter circuit 41A4, and the like are mounted. In the lower high-power area 41B, a plurality of high-power electronic components for performing the remaining power conversion of the control circuit, for example, a power device 41B1 such as an IC of a converter circuit, an IC of an inverter circuit, and the like The large-capacity electrolytic capacitor 41B2 and the high-power connector 41B3 are mounted.

  A cooler 50 for cooling the heat generated in the power device 41B1 is further arranged in the high-power area 41B. The cooler 50 includes a heat sink (not shown) shaped to be attached to the liquid side refrigerant pipe 30 </ b> L of the refrigerant pipe 30. The heat sink is thermally coupled to the power device 41B1 so that heat generated by the power device 41B1 is transmitted, and is disposed on the front side of the printed circuit board 41 toward the service panel (not shown). Since the refrigerant condensed in the outdoor heat exchanger 11 flows during the cooling operation and the refrigerant condensed in the indoor heat exchanger 21 and decompressed by the expansion valve 14 flows in the liquid side refrigerant pipe 30L. The heat sink of the cooler 50 is cooled by the refrigerant, 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

  By the way, the EMC filter circuit 41A4 for preventing noise generated inside the electrical component module 40 from being radiated to the outside and preventing incoming noise from entering the electrical component module 40 is as follows. Usually, the ground pattern of the printed circuit board 41 to which the ground terminal is connected is connected to the ground terminal of a terminal block (not shown) by a ground wire (not shown).

  However, when the distance between the printed circuit board 41 and the terminal block is long, there is a problem that noise is emitted in the middle of the ground wire or noise is picked up by the ground wire.

  An object of the present invention is to provide an air conditioner that solves the above-described problems caused by the routing of the ground wire so that the ground wire does not have to be routed between the filter circuit mounted on the printed circuit board and the ground terminal of the terminal block. It is to provide an outdoor unit.

In order to achieve the above object, an invention according to claim 1 is an outdoor unit of an air conditioner in which a casing is partitioned into a blower chamber and a machine room by a partition plate, and an electrical component module disposed in the machine room; A cooler fixed to the refrigerant pipe in a state of being thermally coupled to the refrigerant pipe of the machine room, and the electrical component module is mounted with electronic components including a noise countermeasure filter circuit, and A main board in which a ground pattern for the filter circuit is disposed in the vicinity of the filter circuit, a power board on which electronic components including a power device are mounted, and a back surface of the main board is mounted so as to face the front. A conductive fixing plate mounted so that the back surface of the power board faces the back surface, and the fixing plate is electrically connected to the fixing plate to fix the fixing plate to the partition plate. A conductive frame attached to the plate, a conductive spacer, and a conductive screw for fixing the spacer between the front surface of the fixing plate and the back surface of the main board, the cooler, The screw is mechanically fixed to the frame and thermally coupled to the power device, the screw is electrically connected to the ground pattern of the main board, and the ground pattern is connected to the ground via the screw and the spacer. It is electrically connected to the fixed plate.
The invention according to claim 2 is the outdoor unit for air conditioning according to claim 1, comprising a terminal block mounted on the frame and having a ground terminal connected to the frame, and the grounding of the frame and the terminal block. The terminals are connected by a ground wire.
According to a third aspect of the present invention, in the outdoor unit for air conditioning according to the first or second aspect, the frame includes an upper frame that fixes an upper portion of the fixed plate to the partition plate, and a lower portion of the fixed plate that is divided into the partition. And a lower frame fixed to the plate, wherein the terminal block is mounted on the lower frame.

  According to the present invention, the ground pattern of the filter circuit is electrically connected to the fixed plate by the screw and the spacer. This fixing plate is electrically connected to the frame. A terminal block having a ground terminal connected to the frame is mounted on the frame. Therefore, it is not necessary to connect the ground pattern of the filter circuit directly to the ground terminal of the terminal block with a ground wire.

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 in a state where an electrical component module is removed from the machine room. It is an expansion | deployment perspective view of an electrical component module and a cooler. It is attachment explanatory drawing which attaches an upper frame and a lower frame to a partition plate. It is a longitudinal cross-sectional view of an electrical component module. It is a cross-sectional view of the AA line of FIG. It is the top view which removed the top panel of the outdoor unit. It is the right view which removed the right side panel of the outdoor unit. It is a front view of a main board. It is a front view of a power board. It is a front view of the main board of another example. It is a circuit diagram of the refrigerant circuit of an air conditioner. It is the front view which removed the service panel of the conventional outdoor unit. It is a front view of the conventional electrical component module.

  1 to 3, 8, and 9 show an outdoor unit 100 according to an embodiment of the present invention. A casing 110 of the outdoor unit 100 is made of a steel plate, and 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, a bottom surface. A panel 117 is provided, and a stand 118 is attached to the bottom panel 117. The casing 110 is partitioned by a steel plate partition 119 in the left-right direction so that the back side of the front panel 111 becomes the heat exchanger chamber 110A and the back side of the service panel 112 becomes the machine room 110B. The partition plate 119 forms 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 chamber 110A. Further, the above-described refrigerant pipe 30, the compressor 12, the expansion valve 14, the accumulator 15, the sub-accumulator 15A, the four-way valve 16, and the like are accommodated in the machine chamber 110B. The machine room 110 </ b> B is visible from the front side of the outdoor unit 100 by removing the service panel 112.

  200 is an electrical component module, and as shown in FIGS. 4 to 9, a steel plate fixing plate 210 disposed in the machine room 110 </ b> B so that the front surface faces the back surface of the service panel 112, and an upper portion of the fixing plate 210. The upper frame 220 made of a long steel plate to which the upper plate 220 is attached, the lower frame 230 made of a long steel plate to which the lower portion of the fixing plate 210 is attached, and the steel plate mounting bracket 240 for attaching the upper frame 220 to the partition plate 119 And a steel plate mounting bracket 250 for attaching the lower frame 230 to the partition plate 119, a main board 260 and a power board 270 which are printed boards. On the main board 260, electronic parts constituting a part of the control circuit, filter circuits and other electronic parts are mounted. On the power board 270, electronic components constituting the remaining part of the control circuit, other electronic components, and a power device 274 described later are mounted. The upper frame 220 and the lower frame 230 are conductive frames according to claims.

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

  A cooler 300 is attached with a U-shaped bent portion 31 of the refrigerant pipe 30L as described later, and straddles the upper frame 220 and the lower frame 230 in a state of being thermally coupled to the U-shaped bent portion 31. As shown, the upper frame 220 and the lower frame 230 are attached.

  The fixing plate 210 includes a main body 211 on which a main board 260 is mounted on the front surface 211a and a power board 270 on the back surface 211b, and a reinforcing plate bent at 90 degrees from the upper end of the main body section 211 toward the back surface 211b. The upper horizontal piece 212 and the upper vertical piece 213 for attachment bent 90 degree | times upward from the rear end of the bending piece 212 are provided. Further, a reinforcing lower horizontal piece 214 bent at 90 degrees from the lower end of the main body 211 toward the front surface 211a, and a lower vertical piece 215 bent at 90 degrees downward from the front end of the lower horizontal piece 214 Prepare. At both ends of the lower vertical piece 215, mounting portions 215a that protrude downward are formed.

  The upper frame 220 includes a vertical piece 221 screwed to the upper vertical piece 213 of the fixing plate 210, a reinforcing upper horizontal piece 222 bent 90 degrees rearward from the upper end of the vertical piece 221, and a vertical piece 211. And a mounting piece 223 bent forward at 45 degrees from the left end thereof. Reference numeral 224 denotes an end portion 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 The upper vertical piece 233 for reinforcement bent 90 degree | times upward from the back end, and the attachment piece 234 bent by 45 degree | times toward the front from the left end of the lower vertical piece 231 are provided. A terminal block 400 is attached to the front side of the lower vertical piece 231. Reference numeral 235 denotes an end portion to which the cooler 300 is attached.

  The cooler 300 includes an aluminum heat sink 310 mounted on the front surface 270a of the power board 270 and thermally coupled to a power device 274, which will be described later, and two semicircular cross sections formed on the heat sink 310. A U-shaped bent portion 31 of the liquid side refrigerant pipe 30L fitted in the groove 311 and a steel plate cover 320 for fixing the U-shaped bent portion 31 to the heat sink 310 are configured. In addition to the groove 311, the heat sink 310 includes a thick plate portion 312 to which the power device 274 is pressed and thermally coupled, and cover attachment portions 313 and 314 formed on both sides of the thick plate portion 312. The cover 320 includes a center pressing portion 321 that presses the U-shaped bent portion 31 of the liquid side refrigerant pipe 30L, a hook portion 322 that is bent from one end of the pressing portion 321, and a hook portion that extends from the other end of the pressing portion 321. And a mounting portion 323 that is bent so as to face 322.

  On the front surface 260a of the main board 260, electronic components and other electronic components that constitute a part of the control circuit are mounted as described above. That is, as shown in FIG. 10, an LED lamp 261a as a display, a display setting circuit 261 including a dip switch 261b and a button switch 261c as an operation unit, and a control IC 262 such as a microcomputer constituting a part of the control circuit. A noise countermeasure EMC (ElectroMagnetic Compatibillity) filter circuit 264, expansion valve 14 and four-way valve 16 including a plurality of connectors 263, a capacitor 264a and a common mode choke coil 264b arranged in the peripheral portion are driven. A drive circuit 265, a temperature detection circuit 266 connected to a thermistor (not shown) for detecting the temperature of the pipe 30, and the like are mounted. Reference numeral 260 b denotes the back surface of the main board 260. 260c is an upper end, 260d is a lower end, 260e is a left end, and 260f is a right end. A screw insertion hole 260g is formed on the ground pattern 260h for the EMC filter circuit 264 and is electrically connected to the ground pattern 260h. The ground pattern 260h is disposed near the EMC filter circuit 264 on the front surface 260a. The main board 260 is mounted on the front surface 211 a so that the back surface 260 b faces the front surface 211 a of the main body 211 of the fixing plate 210.

  On the front surface 270a of the power board 270, as described above, electronic components including the power device 274, which will be described later, constituting the remaining part of the control circuit are mounted. That is, as shown in FIG. 11, a diode bridge 271a for rectification, an IGBT (Insulated Gate Bipolar Transistor) element 271b in which a MOSFET is incorporated in the gate portion of the bipolar transistor to reduce the operating resistance, and a fast recovery diode (FRD) for high-speed operation. An element 271c, a power factor correction (PFC) coil 271d, and a smoothing electrolytic capacitor 271e are mounted. These diode bridge 271a, IGBT element 271b, FRD element 271c, PFC coil 271d, electrolytic capacitor 271e, etc. constitute a converter circuit 271 that converts AC power supplied from the outside into DC power and outputs it. In addition, an IPM (Intelligent Power Module) element 272 that constitutes an inverter circuit that incorporates a drive circuit and a self-protection function and converts DC power supplied from the converter circuit 271 into AC power and outputs the AC power is also mounted. Furthermore, elements such as a switching transformer 273a and a switching IC 273b constituting the switching power supply circuit 273 are mounted. 270b is the back surface of the power board 270. 270c is an upper end, 270d is a lower end, 270e is a left end, and 270f is a right end. The diode bridge 271a, the IGBT element 271b, the FRD element 271c, the IPM element 272, etc. are power devices 274 that generate a large amount of heat, and are mounted vertically in the vicinity of the left end 270e. The power board 270 is mounted on the back surface 211 b so that the back surface 270 b faces the back surface 211 b of the main body 211 of the fixing plate 210. The cooler 300 is in contact with the power device 274. It should be noted that the power substrate 270 also includes a noise device (not shown) other than the power device 274 and the switching power supply circuit 273 that are noise sources.

  In order to arrange the electrical component module 200 in the machine room 110B of the outdoor unit 100, first, the mounting bracket 240 having the slope 241 and the mounting bracket 250 having the slope 251 are attached to the partition plate 119 in advance. 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. Accordingly, the upper frame 220 and the lower frame 230 are attached to the partition plate 119 in a sideways posture in the form of cantilever support.

  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. Further, as shown in FIG. 7, after the U-shaped bent portion 31 of the refrigerant pipe 30L is pressed against the groove 311 of the heat sink 310, the hook portion 322 of the cover 320 is engaged with one cover mounting portion 313 of the heat sink 310. The pressing portion 323 is pressed against the other cover mounting portion 314 of the heat sink 310, and the pressing portion 323 is fixed to the cover mounting portion 314 with screws B3 and B4. This operation is performed with the rear panel 116 of the outdoor unit 100 removed. As described above, the cooler 300 is attached so as to straddle between the end 224 of the upper frame 220 and the end 235 of the lower frame 230 and so that the thick plate portion 312 of the heat sink 310 faces the service panel 112. .

  The main board 260 is mounted on the front surface 211a of the main body 211 of the fixing plate 210, and the power board 270 is mounted on the back surface 211b. The main board 260 and the power board 270 are mounted on the fixing plate 210 using a board clamper (not shown).

  At this time, as shown in a portion surrounded by a dotted line in FIG. 4, when the main board 260 is mounted on the fixing plate 210, the conductive screw B7 inserted through the screw insertion hole 260g from the front side 260a of the main board 260 is removed. Then, the conductive substrate 500 is inserted between the main substrate 260 and the fixing plate 210, and the tip of the screw B7 is screwed to the fixing plate 210. As a result, the ground pattern 260h, the screw B7, the spacer 500, and the fixing plate 210 of the EMC filter circuit 264 are electrically connected.

  Then, the fixing plate 210 on which the main board 260 and the power board 270 are mounted has its upper vertical piece 213 aligned with the vertical piece 221 of the upper frame 220 and its lower vertical piece 215 aligned with the lower vertical piece 231 of the lower frame 230. In this way, the screws B5 and B6 are attached. As the screw B6 coupled to the lower vertical piece 215 and the lower vertical piece 231 of the lower frame 230, a conductive one is used to electrically connect the lower vertical piece 215 to the lower frame 230.

  At this time, the power device 274 of the power board 270 is pressed against the thick plate portion 312 of the heat sink 310 of the cooler 300 and is thermally coupled there. Therefore, when the operation of the air conditioner starts, the heat generated by the power device 274 is cooled by the cooler 300.

  Further, a ground wire 600 is connected between the ground terminal 401 of the terminal block 400 attached to the lower frame 230 and the lower frame 230.

  After the electrical component module 200 is attached to the machine room 110B as described above, a plug in which necessary wiring is connected to the connector 263 of the main board 260 of the electrical component module 200 is connected, and the terminal board 400 has the required Another wiring is connected.

  As described above, in this embodiment, the ground pattern 260h of the EMC filter circuit 264 of the main board 260 of the electrical component module 200, the screw B7, the spacer 500, and the fixing plate 210 are electrically connected. The fixing plate 210 is electrically connected to the lower frame 230 by being fixed to the lower frame 230 with screws B6. Therefore, the ground pattern 260 h of the EMC filter circuit 264 of the main board 260 is electrically connected to the lower frame 230. The lower frame 230 is connected to the ground terminal 401 of the terminal block 400 by a ground wire 600. Therefore, in order to ground the ground pattern 260h of the EMC filter circuit 264, an external noise that becomes a problem when the ground pattern 260h is connected to the ground terminal 401 of the terminal block 400 with an earth wire is picked up or spontaneous noise is radiated. Nothing will happen.

  In addition, since the main board 260 and the power board 270 are mounted on the fixing board 210 through the fixing board 210 attached to the machine room 110B, the vertical size of the main board 260 and the power board 270 is 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 size can be significantly reduced, and it is suitable for an outdoor unit having a casing with little room in the vertical space. It is.

  The power device 274 mounted on the power board 270 is thermally coupled to the cooler 300 on the back surface 211b side of the fixing plate 210, but is only pressed against the cooler 300. If B5 and B6 are loosened, the fixing plate 210, the main board 260, and the power board 270 can be integrally removed from the front of the machine room 110B without being disturbed by the cooler 300. Maintenance of the power board 270 is facilitated.

  Further, the main board 260 is equipped with a display setting circuit 261 including a LED lamp 261a, a dip switch 261b, a button switch 261c, and a plurality of connectors 263 on the front surface 260a. By simply removing the LED, the operating state of the air conditioner can be confirmed according to the display state of the LED lamp 261a, the setting contents can be changed by operating the dip switch 261b, the button switch 261c, etc., or the plug to the connector 263 can be connected. It becomes easy to change the circuit connection by inserting and removing.

  When the main board 260 is mounted on the fixing plate 210, as shown in FIG. 12, the four corners of the main board 260 may be fixed to the fixing plate 210 with screws B8 and a spacer (not shown). In such a case, if a spacer (not shown) fixed with the screw B8 is a spacer having the same length as the spacer 500 of the present embodiment, the back surface 260b of the main board 260 is highly accurate with respect to the front surface 211a of the fixing plate 210. Can be fixed in parallel. At this time, if the ground pattern 260h in the vicinity of the relatively heavy common coil 264b of the EMC filter circuit 264 is electrically connected and fixed to the fixing plate 210 with the spacer 500 and the screw B7, the common coil 264b It is possible to prevent the entire main substrate 260 from being bent. Further, the main board 260 can be strengthened against external impacts such as vibration during transportation and dropping. Therefore, the reliability as the main board 260 can be improved.

30L: Liquid side refrigerant pipe, 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 component 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, 224: End 230: Lower frame, 231: Lower vertical piece, 232: Upper horizontal piece, 233: Upper vertical piece, 234: Mounting piece, 235: End portion 240: Mounting bracket, 241: Slope 250: Mounting bracket, 25 : Slope 260: main board, 260a: front, 260b: back, 260g: screw insertion hole, 260h: ground pattern 270: power board, 270a: front, 270b: back, 274: power device 300: cooler, 310: heat sink 320: Cover 400: Terminal block 401: Ground terminal 500: Spacer 600: Ground wire

Claims (3)

In an outdoor unit of an air conditioner whose casing is partitioned into a blower chamber and a machine chamber by a partition plate,
An electrical component module disposed in the machine room, and a cooler fixed to the refrigerant pipe in a state of being thermally coupled to the refrigerant pipe of the machine room,
The electrical component module includes a main board on which electronic components including a filter circuit for noise suppression are mounted and a ground pattern for the filter circuit is disposed in the vicinity of the filter circuit on the front surface, and an electronic component including a power device. A power board to be mounted; a conductive fixing board mounted so that the back surface of the main board faces the front surface; and a back surface of the power board facing the back surface; and the fixing plate as the partition plate A conductive frame attached to the fixed plate to be electrically connected to the fixed plate for fixing to the fixed plate, a conductive spacer, and the spacer on the front surface of the fixed plate and the back surface of the main substrate. With conductive screws fixed between
The cooler is mechanically fixed to the frame and thermally coupled to the power device;
The outdoor unit of an air conditioner, wherein the screw is electrically connected to the ground pattern of the main board, and the ground pattern is electrically connected to the fixing plate through the screw and the spacer. Machine. In the outdoor unit of the air conditioning according to claim 1,
An air conditioner outdoor unit comprising a terminal block mounted on the frame and having a ground terminal connected to the frame, wherein the frame and the ground terminal of the terminal block are connected by a ground wire. . In the outdoor unit of the air conditioning according to claim 1 or 2,
The frame includes an upper frame that fixes an upper portion of the fixing plate to the partition plate, and a lower frame that fixes a lower portion of the fixing plate to the partition plate, and the terminal block is mounted on the lower frame. The indoor unit of the air conditioner characterized by having.

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