JP2008144982A - Outdoor unit of air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily connect wiring to an electrical equipment unit disposed in a machine chamber of an air conditioner. <P>SOLUTION: The outdoor unit 20 comprises a heat exchanger chamber 24 and the machine chamber 30. The electrical equipment unit 40 is disposed and fixed to the machine chamber 30. The electrical equipment unit 40 is fixed in the machine chamber 30 in a state that connecting portions 42, 44 have inward-looking attitude to the machine chamber 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for providing an electrical unit in an outdoor unit of an air conditioner.

  A general outdoor unit of an air conditioner is partitioned into a heat exchanger room and a machine room by a partition wall.

  An outdoor heat exchanger or the like is accommodated in the heat exchanger chamber. The machine room houses an electrical unit with a built-in circuit for driving and controlling a blower, a compressor, etc., a compressor, an expansion valve, a four-way switching valve, etc. that constitute an external refrigerant flow path during cooling and heating. ing.

  In addition, there exist a thing of patent document 1 and 2 as a prior art which discloses the installation aspect of the electrical equipment unit in an outdoor unit, for example.

Japanese Utility Model Publication 62-19535 JP-A-3-75424

  However, it is necessary to connect a wiring for connecting to an electrical element outside the electrical unit, such as a blower or a compressor, to the electrical unit as described above. Therefore, it is required that wiring can be easily connected to the electrical unit.

  Therefore, an object of the present invention is to make it possible to easily connect the wiring to the electrical unit disposed in the machine housing portion of the air conditioner.

  In order to solve the above problems, an outdoor unit of this air conditioner includes an outdoor unit housing having a machine storage unit, an electrical unit housed in the machine storage unit and having an electrical connection unit for external wiring connection, A cooling member that can be cooled by a refrigerant flowing in the machine housing portion, and the electrical unit has an attitude in which the electrical connection portion faces inward of the machine housing portion or an opening that can be opened and closed of the machine housing portion. These are fixed in the machine storage unit.

  In this case, the electrical unit is attached to a position where the cooling member can be disposed between the electrical storage unit and the outer wall of the machine housing portion, and the electrical unit is disposed on a portion of the outer wall facing the electrical unit. The fixing work opening may be formed.

  In addition, a cooling member that can be cooled with a refrigerant flowing in the machine housing portion is further provided, and the cooling member is provided on an inward surface of the machine housing portion of the electrical unit or an opening that can be opened and closed of the machine housing portion. It may be attached to the facing surface.

  The apparatus further includes a cooling member through which a refrigerant flowing between an expansion valve disposed in the machine housing portion and an outdoor heat exchanger disposed in the heat exchanger chamber passes, wherein the expansion valve is housed in the machine. The electric unit may be provided in the vicinity of the outer wall within the section, and the electrical unit may be provided in the vicinity of the outer wall.

  According to the outdoor unit of the air conditioner, the electrical unit is fixed in the machine storage unit in a posture in which the electrical connection unit faces the inward or openable opening of the machine storage unit. Wiring can be easily connected to the electrical unit disposed in the machine storage section of the machine. Further, the electrical unit can be well cooled by the cooling member that can be cooled by the refrigerant flowing in the machine housing portion.

  In addition, the electrical unit is attached to a position where the cooling member can be disposed between the electrical storage unit and the outer wall of the machine housing portion, and the electrical unit is fixed to a portion of the outer wall facing the electrical unit. If the work opening is formed, the cooling member can be easily attached to the electrical unit via the fixed work opening.

  Furthermore, when the cooling member is attached to a surface of the electrical unit facing the inward side of the machine storage unit or a surface facing the openable and closable opening of the mechanical storage unit, a water cooling jacket is provided via the opening. It can be easily attached to the electrical unit.

  In addition, when the expansion valve is provided in the machine housing portion and in the vicinity of the outer wall, and the electrical unit is provided in the vicinity of the outer wall, the refrigerant piping between the expansion valve and the cooling member is routed. Becomes easy.

  Hereinafter, the outdoor unit of the air conditioner which concerns on embodiment is demonstrated. FIG. 1 is an explanatory view showing a state of an outdoor unit of an air conditioner as viewed from above, FIG. 2 is an explanatory view showing a state of the outdoor unit of the air conditioner as viewed from the front, and FIG. 3 is an air conditioner. It is a figure which shows the whole heat exchange system.

<1. Overall configuration of air conditioner and outdoor unit>
This air conditioner includes an indoor unit 10 and an outdoor unit 20, which are interconnected via a predetermined refrigerant pipe. Usually, the indoor unit 10 is installed at a position (for example, indoors) where air can be supplied to a room to be air-conditioned, and the outdoor unit 20 is installed at a position (for example, outdoor) where heat can be exchanged with the outside air.

  The indoor unit 10 includes an indoor heat exchanger 12.

  The outdoor unit 20 includes an outdoor unit housing 22 having a machine room 30 as a machine storage unit, and an electrical unit 40 housed in the machine room 30.

  The outdoor unit housing 22 is formed of a metal plate that has been punched and bent, or a combination of such a metal plate and a molded resin plate, and the overall shape is formed in a substantially bowl shape.

  The outdoor unit housing 22 is partitioned into two spaces by a partition wall 23. One of the spaces is configured in a heat exchanger chamber 24, and an outdoor heat exchanger 26, an outdoor heat exchanger fan 27, and a motor 27 a for driving the fan 27 are accommodated in the heat exchanger chamber 24. ing. Further, a vent hole (not shown) is formed in a portion of the outdoor unit housing 22 that constitutes the heat exchanger chamber 24, and the outside air is heated by the fan 27 for the outdoor heat exchanger fan 27 so that the outside air is heat exchanger chamber 24. After being introduced to the outdoor heat exchanger 26, the air is discharged to the outside through the periphery of the outdoor heat exchanger 26.

  The other of the two spaces partitioned in the outdoor unit housing 22 is configured in the machine room 30. In the machine room 30, in addition to the electrical unit 40, the compressor 32 that compresses the refrigerant, the accumulator 33 that separates the refrigerant liquid in the suction steam for the compressor 32, and the refrigerant pressure flowing in the outdoor unit 20 are adjusted. An expansion valve 34 (electronic expansion valve) that switches, a four-way switching valve 36 that switches the direction of refrigerant flow, a pipe 38 that connects these, and the like are housed. In addition, a pair of closing valves 39a and 39b are provided in the lower half of the outer wall 30a facing the partition wall 23 and facing the outside of the side wall surrounding the machine room 30. These shut-off valves 39a and 39b close a pair of connection ports for connecting a refrigerant pipe connecting the indoor unit 10 and the outdoor unit 20 to the pipe 38 so as to be freely opened and closed. Here, the description will be made on the assumption that the outdoor unit housing 22 includes the heat exchanger chamber 24 and the machine chamber 30. However, the entire outdoor unit housing 22 does not have the partition plate as described above, and has one storage chamber. The structure which forms may be sufficient. In this case, the outdoor heat exchanger 24 is accommodated in the one accommodation chamber. In addition, a part of the storage chamber is a machine storage unit that stores and fixes the electrical unit 40 and the like as a machine storage unit.

  One of the machine rooms 30 is formed in an opening 31 that can be opened and closed. Here, an opening 31 is provided in almost the entire front surface of the machine room 30. By attaching a plate-like lid member 31a (front panel) to the main opening 31 via screws or an engagement structure, the opening 31 is closed. Note that the entire front surface of the outdoor unit housing 22 may be open, and the opening may be closed by a single lid member (front panel).

  The electrical unit 40 is formed in a flat, substantially rectangular parallelepiped shape, and an inverter circuit that converts a power supply voltage into a desired AC voltage and supplies the AC voltage to the compressor 32 is incorporated therein. Various electrical circuits such as a control circuit for processing the operation of the air conditioner or the outdoor unit 20 in whole or in part may be incorporated in the electrical unit 40.

  The electrical unit 40 has a connector portion 42 as an electrical connection portion for connecting the inverter circuit to the compressor 32. In addition, the electrical unit 40 includes a connector portion 44 as another electrical connection portion for connecting an internal electrical circuit to another control target, an electrical circuit, or the like.

  These connector portions 42 and 44 are provided on one main surface 41 a that is the outer surface of the casing 41 that serves as the outer shell of the electrical unit 40. And the connector part 48a at the end of the wiring 48 extending from the compressor 32 is connected to the connector part 42, so that the inverter circuit inside the electrical unit 40 and the compressor 32 are electrically connected. . Further, the connector 49a at the end of the wiring 49 extended from another control object or electric circuit is connected to the connector part 44, so that the electric circuit inside the electrical unit 40 and the other control object or electric circuit, etc. And an electrical connection is made.

  Further, the electrical unit 40 includes a cooling member 50. The cooling member 50 is configured to be cooled with a refrigerant flowing through the machine chamber 30. More specifically, the cooling member 50 is formed by forming a pipe 52 through which the refrigerant passes in a metal member such as aluminum or copper or a heat conductive resin member. A refrigerant flowing between the expansion valve 34 disposed in the machine chamber 30 and the outdoor heat exchanger 26 disposed in the heat exchanger chamber 24 passes through the pipe 52. Yes. And with the said refrigerant | coolant, the electrical equipment unit 40 is cooled rather than ambient temperature. The cooling member 50 is screwed on the outer surface of the electric unit 40, more specifically, on the outer surface of the electric unit 40 and on the main surface 41b opposite to the main surface 41a on which the connector portions 42 and 44 are formed. It is fixed using the fixture 54, such as.

  The mounting position and mounting posture of the electrical unit 40 in the machine room 30 will be described in detail later.

  Here, with reference to FIG. 3, the refrigerant | coolant piping in this air conditioner and the refrigerant | coolant flow path at the time of cooling and heating are demonstrated. In FIG. 3, the solid line arrow and the solid line of the four-way switching valve 36 indicate the refrigerant flow path during cooling, and the broken line arrow and the broken line of the four-way switching valve 36 indicate the refrigerant flow path during heating.

  That is, one connection port of the indoor heat exchanger 12 is connected to the connection port of the four-way switching valve 36. One of the other three connection ports of the four-way switching valve 36 is connected to the suction port 32a of the compressor 32 via the accumulator 33, the other one is connected to the discharge port 32b of the compressor 32, and The other one is connected to one connection port of the outdoor heat exchanger 26. The four-way switching valve 36 switches the refrigerant flow path as follows during cooling and heating. That is, during cooling, the suction port 32a of the compressor 32 is connected to the indoor heat exchanger 12 via the accumulator 33, and the discharge port 32b of the compressor 32 is connected to the outdoor heat exchanger 26. . On the other hand, during heating, on the contrary, the suction port 32a of the compressor 32 is connected to the outdoor heat exchanger 26 via the accumulator 33, and the discharge port 32b of the compressor 32 is connected to the indoor heat exchanger 12. Like that. Thereby, switching between cooling and heating is possible. The other connection port of the outdoor heat exchanger 26 is connected to the other connection port of the indoor heat exchanger 12 via the cooling member 50 and the expansion valve 34.

  The expansion valve 34 is connected to one closing valve 39a attached to the lower half of the outer wall 30a via a pipe 38. For this reason, the main expansion valve 34 is disposed in the machine chamber 30 and in the vicinity of the outer wall 30a.

  During cooling, the refrigerant condensed in the outdoor heat exchanger 26 passes through the cooling member 50, is expanded by the expansion valve 34, and is supplied to the indoor heat exchanger 12. The refrigerant given to the indoor heat exchanger 12 evaporates and cools in the indoor heat exchanger 12, and is then sucked and compressed by the compressor 32 through the accumulator 33. The refrigerant compressed by the compressor 32 is condensed again by the outdoor heat exchanger 26 and circulates in the refrigerant pipe.

  During this cooling, the refrigerant flowing through the cooling member 50 is cooled and condensed by the outdoor heat exchanger 26, so that the temperature is sufficiently low to cool the electrical unit 40.

  On the other hand, during heating, the refrigerant condensed in the indoor heat exchanger 12 is expanded by the expansion valve 34 and then supplied to the outdoor heat exchanger 26 through the cooling member 50. The refrigerant given to the outdoor heat exchanger 26 evaporates and is then sucked and compressed by the compressor 32 via the accumulator 33. The refrigerant compressed by the compressor 32 is condensed again by the indoor heat exchanger 12 and circulates in the refrigerant pipe.

  During this heating, the refrigerant flowing through the cooling member 50 is cooled and condensed by the indoor heat exchanger 12 and further expanded by the expansion valve 34, so that the temperature is low enough to cool the electrical unit 40.

<2. Mounting orientation and configuration of electrical unit>
The electrical unit 40 is housed and fixed in the machine room 30 with the following posture and configuration.

  That is, the electrical unit 40 is fixed in the machine room 30 in a posture in which the connector portions 42 and 44 are inward of the machine room 30. Here, the posture in which the connector parts 42 and 44 are inward of the machine room 30 is, for example, the front end side of the connector parts 42 and 44 without the connector parts 42 and 44 being in contact with the wall part surrounding the machine room 30. In addition, it means an attitude in which at least a part of the space in the machine room 30 is widened. Here, the electrical unit 40 is attached to the outer wall 30a, and an upper space in the machine room 30 is interposed between the connector portions 42 and 44 and the partition wall 23.

  That is, a space is widened at the tip end side of the connector portions 42 and 44, and the connector portions 48a and 48b can be easily connected to the connector portions 42 and 44 using the space.

  The electrical unit 40 is mounted at a position where the cooling member 50 can be disposed between the electrical unit 40 and the outer wall of the machine room 30, and the cooling member 50 is located near the outer wall 30a, that is, the outer wall 30a. And the electrical unit 40.

  More specifically, an electrical unit fixing part 30 b is formed in the upper half of the outer wall 30 a of the machine room 30. The electrical unit fixing part 30 b is formed so as to protrude into the machine room 30. The main surface 41b portion of the electrical unit 40 is attached to the projecting end of the electrical unit fixing part 30b with screws or the like. In this attached state, the flat direction of the electrical unit 40 is in a posture along the surface direction of the outer wall 30a. Thereby, the electrical unit 40 is fixed in a state where there is a gap corresponding to the protruding dimension of the electrical unit fixing part 30b between the main surface 41b of the electrical unit 40 and the inner surface of the outer wall 30a. The cooling member 50 fixed at a position below the main surface 41b of the electrical unit 40 and fixed to the electrical unit fixing portion 30b is between the main surface 41b of the electrical unit 40 and the inner surface of the outer wall 30a. It is arranged.

  Further, a fixing work opening 30 h is formed in a portion of the outer wall 30 a of the machine room 30 that faces the electrical unit 40, more specifically, a portion that faces the cooling member 50. The fixing work opening 30 h has a size and a shape that allow the cooling member 50 to be attached to the electrical unit 40. When the cooling member 50 is attached to the main surface 41b of the electrical unit 40 using a fixture 54 such as a screw, the fixing work opening 30h is arranged in the vicinity of the cooling member 50, and the screw It has a size and shape that can be used for mounting work such as fastening work with a turning tool. The fixing work opening 30h may be opened and closed with a lid made of resin, metal plate, or the like.

  In manufacturing the outdoor unit 20 as described above, the compressor 32, the accumulator 33, the expansion valve 34, the four-way switching valve 36, the closing valves 39a and 39b, the piping 38 connecting these, etc. Is installed to form a refrigerant path, and then the electrical unit 40 is attached. Here, since the cooling member 50 is incorporated in the refrigerant path and it is difficult to freely handle it, it is difficult to attach the cooling member 50 to the electrical unit 40 in advance. Therefore, the electrical unit 40 is attached to the outer wall 30a while the electrical unit 40 is disposed between the electrical unit 40 and the outer wall 30a. The cooling member 50 can be attached to the electrical unit 40 using the fixing work opening 30h.

  According to the outdoor unit 20 of the air conditioner configured as described above, the electrical unit 40 is fixed in the machine room 30 in a posture in which the connector portions 42 and 44 are directed toward the machine room 30. For this reason, the space in the machine room 30 is widened on the tip side of the connector portions 42 and 44. Therefore, the connector portions 48 a and 49 a at the ends of the wirings 48 and 49 can be easily connected to the connector portions 42 and 44 of the electrical unit 40 using the space.

  In addition, the electrical unit 40 is mounted at a position where the cooling member 50 can be disposed between the electrical unit 40 and the outer wall 30a of the machine room 30, and the fixing work opening 30h is formed in a portion of the outer wall 30a facing the electrical unit 40. Therefore, the cooling member 50 can be easily attached to the electrical unit 40 through the fixing work opening 30h.

  In general, since the expansion valve 34 is connected to the closing valve 39a, the expansion valve 34 is provided in the vicinity of the closing valve 39a, that is, in the vicinity of the outer wall 30a in the machine chamber 30. Further, the coolant flowing in the vicinity of the expansion valve 34 flows through the cooling member 50. Therefore, by providing the electrical unit 40 in the vicinity of the outer wall 30a in the machine room 30, the distance between the cooling member 50 attached to the electrical unit 40 and the expansion valve 34 can be shortened, and the refrigerant pipe 38 therebetween. Can be easily handled. For example, in the example shown in FIG. 2, the pipe 38 extending from the expansion valve 34 is routed so as to rise upward, whereby the connection between the two can be performed, and the routing is easy.

  In addition, since the outdoor unit 20 uses the cooling member 50 that cools using a refrigerant, even if the electrical unit 40 is disposed at the above position, cooling can be performed without any problem.

<3. Modification>
Hereinafter, the outdoor unit of the air conditioner which concerns on a modification is demonstrated. In the following description, the same components as those described in the above embodiment are denoted by the same reference numerals, description thereof is omitted, and differences will be mainly described.

  FIG. 4 is an explanatory view showing a state of the outdoor unit of the air conditioner according to the first modification viewed from above, and FIG. 5 is an explanatory view showing a state of the outdoor unit of the air conditioner viewed from the front. . In FIG. 5, piping and the like are omitted.

  In the outdoor unit 120 according to the first modification, the flat direction of the electrical unit 140 corresponding to the electrical unit 40 is fixed to the outer wall 30a in a posture in which the flat direction is substantially perpendicular to the outer wall 30a and substantially vertical. And the cooling member 50 is being fixed to the main surface 141b facing the outer side wall 30a among the outer surfaces of the electrical equipment unit 140 by the structure and manufacturing process similar to the said embodiment.

  In addition, connector portions 142 and 144 corresponding to the connector portions 42 and 44 are provided on the main surface 141 a facing the opening 31 side of the outer surface of the electrical unit 140. In other words, the electrical unit 140 is fixed in a posture in which the connector parts 142 and 144 face the opening 31.

  For this reason, a space is widened through the opening 31 on the distal end side of the connector portions 142 and 144, and the connector portions 48a and 48b can be easily connected to the connector portions 142 and 144 using the space. ing.

  FIG. 6 is an explanatory view showing a state of the outdoor unit of the air conditioner according to the second modification as viewed from above, and FIG. 7 is an explanatory view showing a state of the outdoor unit of the air conditioner as viewed from the front. . In addition, piping etc. are abbreviate | omitted in FIG.

  In the outdoor unit 220 according to the second modified example, the connector surface 242 corresponding to the connector portions 42 and 44 is formed on the main surface 241a facing the opening 31 of the outer surface of the electrical unit 240 corresponding to the electrical unit 40. 244 is attached and attached to the cooling member 250 corresponding to the cooling member 50.

  In other words, the electrical unit 240 is fixed in a posture in which the connector portions 242 and 244 and the cooling member 250 face the opening 31.

  For this reason, a space is widened through the opening 31 on the front end side of the connector portions 242 and 244, and the connector portions 48a and 48b can be easily connected to the connector portions 242 and 244 using the space. ing.

  In addition, with the electrical unit 240 attached to the outer wall 30a, the space extends outside the main surface 241a through the opening 31. Therefore, the cooling member 250 can be easily attached using a fixing part such as a screw. It can be fixedly attached to the main surface 241a.

  Further, on the main surface 241a of the electrical unit 240, connector portions 242 and 244 are provided on the partition wall 23 side, and the cooling member 250 is attached on the outer wall 30a side. Therefore, the cooling member 250 is provided in the vicinity of the outer wall 30a, and the piping 38 from the expansion valve 34 provided in the vicinity of the outer wall 30a is easily routed and connected to the cooling member 250. be able to.

  In particular, in the second modified example, the connector portions 242, 244 and the cooling member 250 are provided on one main surface 241a of the electrical unit 240. Therefore, the connection work for the connector portions 242, 244 and the cooling member 250 are performed. Installation work can be performed from the same direction, and further contributes to improvement in assembly workability.

<4. Other variations>
In addition, in the said embodiment etc., although the electrical equipment units 40,140,240 are attached to the outer side wall 30a, the attachment object is not restricted to this example. For example, a configuration in which the electrical units 40, 140, 240 are fixed to the lid member 31 a that closes the opening 31, a configuration in which the electrical units 40, 140, 240 are fixed via an attachment plate fixed in the machine room 30 can be adopted. When fixing the electrical units 40, 140, 240 to the lid member 31 a that closes the opening 31, the mounting of the cooling member 250 and the connection to the connector parts 42, 44, 142, 144, 242, 244 are completed. Therefore, the electrical units 40, 140, 240 are preferably attached to the lid member 31a.

  Further, the mounting configuration of the electrical unit 240 and the mounting structure of the cooling member 250 are not limited to screws, and various mounting configurations such as a structure using a hook or the like can be adopted.

  In the above-described embodiment, etc., the electrical units 40, 140, 240 are disposed at the upper position of the machine room 30, but may be disposed at the lower position.

  Moreover, in each said embodiment, the surface of the electrical equipment unit 40,140,240 to which the connector part 42,44,142,144,242,244 is attached is either the widest surface, side surface, etc. of the electrical equipment 40,140,240. It may be a surface. Further, in the configuration in which the electrical units 40, 140, 240 do not have a casing and the substrate is exposed, the connector portions 42, 44, 142, 144, 242, 244 are fixed to one surface of the substrate, etc. It may be. That is, the connector portions 42, 44, 142, 144, 242, and 244 may be attached to the electrical units 40, 140, and 240 in the above-described direction regardless of the specific attachment portions.

It is explanatory drawing which shows the state which looked at the outdoor unit of the air conditioner which concerns on embodiment from upper direction. It is explanatory drawing which shows the state which looked at the outdoor unit of the air conditioner same as the above from the front. It is a figure which shows the heat exchange system of the whole air conditioner same as the above. It is explanatory drawing which shows the state which looked at the outdoor unit of the air conditioner which concerns on a 1st modification from upper direction. It is explanatory drawing which shows the state which looked at the outdoor unit of the air conditioner same as the above from the front. It is explanatory drawing which shows the state which looked at the outdoor unit of the air conditioner which concerns on a 2nd modification from upper direction. It is explanatory drawing which shows the state which looked at the outdoor unit of the air conditioner same as the above from the front.

Explanation of symbols

20, 120, 220 Outdoor unit 24 Heat exchanger room 30 Machine room 30a Outer wall 30h Fixed work opening 31 Opening 34 Expansion valve 40, 140, 240 Electrical unit 42, 44, 142, 144, 242, 244 Connector part 50,250 Cooling member 54 Attachment

Claims (4)

An outdoor unit housing (22) having a machine storage (30);
An electrical unit (40; 140; 240) housed in the housing part and having an electrical connection part for external wiring connection;
A cooling member (50) capable of being cooled by a refrigerant flowing in the machine room;
With
The electrical unit has a posture in which the electrical connection part (42, 44; 142, 144; 242, 244) faces the machine storage part inward or the opening (31) that can be opened and closed of the machine storage part. An air conditioner outdoor unit (20; 120; 220) fixed in the machine housing. An outdoor unit for an air conditioner according to claim 1,
The electrical unit (40, 140) is mounted at a position where the cooling member can be disposed between the electrical housing unit and the outer wall (30a) of the machine housing portion, and a portion of the outer wall facing the electrical unit is mounted. An outdoor unit for an air conditioner in which an opening (30h) for fixing work of the electrical unit is formed. An outdoor unit for an air conditioner according to claim 1,
A cooling member (250) that can be cooled by a refrigerant flowing in the machine housing portion;
The outdoor unit of an air conditioner, wherein the cooling member is attached to a surface of the electrical unit (240) facing the inward side of the machine storage unit or a surface facing the opening (31) that can be opened and closed of the machine storage unit. It is an outdoor unit of the air conditioner in any one of Claims 1-3,
A cooling member (50; 250) through which the refrigerant flowing between the expansion valve (34) disposed in the machine housing and the outdoor heat exchanger (26) disposed in the heat exchanger chamber passes. Prepared,
The expansion valve is provided in the machine housing and in the vicinity of the outer wall (30a);
The outdoor unit of an air conditioner, wherein the electrical unit (250) is provided in the vicinity of the outer wall.

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