JP5459512B2 - Power conversion device and electrical equipment - Google Patents

Description

  The present invention relates to a power conversion device and an electric device.

Patent Document 1 describes a backup fan switching structure in which two cooling fans are installed in a device, and one fan is driven when one fan fails.
In this backup fan switching structure, two cooling fans are arranged next to each other in a V shape, and a V-shaped closing plate having an angle smaller than the V-shaped angle is provided between the cooling fans. In addition, the cooling fan is disposed so as to be rotatable about a fulcrum.
Therefore, the backup fan switching structure is configured such that when one of the closing plates opens the exhaust hole of the cooling fan that has started operation, the other closing plate closes the exhaust hole of the failed fan.
This backup fan switching structure protrudes upward from the upper part of the device.

JP 2004-112899 A

Here, in general, there is a case where an electric device is limited in the vertical dimension before installation, for example, from the viewpoint of transportation.
An object of this invention is to provide the power converter device and electric equipment which can suppress the increase in the dimension of the up-down direction before installation.

The electrical device according to the first invention that meets the above-described object includes a housing having first and second exhaust holes formed in an upper portion thereof,
An exhaust device provided in the first exhaust hole;
A preliminary exhaust device provided in the second exhaust hole and substituting for the exhaust device;
The exhaust device and the preliminary exhaust device, respectively, an exhaust fan that exhausts air inside the housing to the outside from the first and second exhaust holes;
An elastic member fixed to the housing;
A plate-like member having one end fixed to the elastic member and covering the first and second exhaust holes ;
A stopper that restricts the degree of opening of the plate-like member that is opened by receiving the pressure of the air discharged by the exhaust fan .

  In the electrical device according to the first aspect of the invention, the stopper is provided on the elastic member.

An electrical device according to a second invention that meets the above-described object includes a housing having first and second exhaust holes formed in an upper portion thereof,
An exhaust device provided in the first exhaust hole;
A preliminary exhaust device provided in the second exhaust hole and replacing the exhaust device;
A control device that operates the exhaust fan of the preliminary exhaust device after determining that an abnormality has occurred in the exhaust fan of the exhaust device, and
The exhaust device and the preliminary exhaust device, respectively, an exhaust fan that exhausts air inside the housing to the outside from the first and second exhaust holes;
An elastic member made of chloroprene and fixed to the housing;
One end portion is fixed to the elastic member, and has a plate-like member that covers the first and second exhaust holes.

In the electric device according to the second aspect of the present invention, only one plate member is provided.

An electrical device according to a third aspect of the present invention that meets the above-described object includes a housing having first and second exhaust holes formed in an upper portion thereof,
An exhaust device provided in the first exhaust hole;
A preliminary exhaust device provided in the second exhaust hole and substituting for the exhaust device;
The exhaust device and the preliminary exhaust device, respectively, an exhaust fan that exhausts air inside the housing to the outside from the first and second exhaust holes;
An elastic member fixed to the housing across the first and second exhaust holes in plan view;
One end portion is fixed to the elastic member, and has a plurality of plate-like members that cover the first and second exhaust holes.
An electrical device according to a fourth aspect of the present invention that meets the above-described object includes a housing having first and second exhaust holes formed in an upper portion thereof,
An exhaust device provided in the first exhaust hole;
A preliminary exhaust device provided in the second exhaust hole and substituting for the exhaust device;
The exhaust device and the preliminary exhaust device, respectively, an exhaust fan that exhausts air inside the housing to the outside from the first and second exhaust holes;
A plate material fixed to the housing and made of an elastic body;
One end portion is fixed to the plate member, and has a plate-like member that covers the first and second exhaust holes.

A power conversion device according to a fifth aspect of the present invention that meets the above-described object includes an input transformer unit having an input transformer connected to a commercial power source,
A power converter having a unit power converter for power converting the output of the input transformer,
The input transformer unit and the power conversion unit, respectively, a housing having first and second exhaust holes formed in the upper part,
An exhaust device provided in the first exhaust hole;
A preliminary exhaust device that is provided in the second exhaust hole and replaces the exhaust device;
The exhaust device and the preliminary exhaust device, respectively, an exhaust fan that exhausts air inside the housing to the outside from the first and second exhaust holes;
An elastic member fixed to the housing across the first and second exhaust holes in plan view;
One end side is fixed to the elastic member, and has a plurality of plate-like members covering the first and second exhaust holes.

  In the power conversion device and the electric apparatus according to the present invention, it is possible to suppress an increase in the dimension in the vertical direction before installation, compared to the case where the configuration of the present invention is not provided.

It is a front view of the inverter which concerns on the 1st Embodiment of this invention. It is a layout view of each exhaust device and each preliminary exhaust device that the inverter has. It is a sectional side view of the inverter. It is an internal block diagram of the inverter. It is a perspective view of the lid which each exhaust device and each preliminary exhaust device of the inverter have. It is a side view of the lid which each exhaust device and each preliminary exhaust device of the inverter has. It is a top view of the cover which each exhaust apparatus and each preliminary exhaust apparatus of the inverter have. It is a side view of each exhaust apparatus and each preliminary exhaust apparatus of the inverter. It is a front view of each exhaust apparatus and each preliminary exhaust apparatus of the inverter. It is explanatory drawing which shows operation | movement of each preliminary exhaust apparatus of the inverter. It is a perspective view of the cover which each exhaust apparatus and each preliminary exhaust apparatus of an inverter concerning a 2nd embodiment of the present invention have. It is a side view of the lid which each exhaust device and each preliminary exhaust device of the inverter has. It is a top view of the cover which each exhaust apparatus and each preliminary exhaust apparatus of the inverter have. It is explanatory drawing which shows operation | movement of each preliminary exhaust apparatus of the inverter.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. In each drawing, portions not related to the description may be omitted.

A serial multiple inverter (an example of a power converter, hereinafter simply referred to as “inverter”) 10 according to the first embodiment of the present invention shown in FIG. 1 includes an input transformer unit 11, a power converter unit 12, and a control unit. 13. Note that the power conversion device can also be regarded as an example of an electrical device.
The casing 21 of the inverter 10 is configured by connecting first to third casing portions 15a to 15c.

An input transformer unit 11 shown in FIG. 1 includes a first housing portion 15a located on the left side when the inverter 10 is viewed from the front, and an input transformer 14 provided inside the first housing portion 15a (see FIG. 4). )have.
The input transformer 14 is provided with a primary winding 22 on the primary side. A commercial power supply (three-phase AC power supply) 24 is connected to the primary winding 22. For example, first to ninth secondary windings 26 that are insulated from the primary side are provided on the secondary side of the input transformer 14.
A first front door 27a for maintaining the internal input transformer 14 is provided on the right side of the front surface of the first casing 15a of the input transformer unit 11.

The power converter 12 shown in FIGS. 1 and 3 is provided in a second housing 15b located on the right side of the input transformer 11 when the inverter 10 is viewed from the front, and in the second housing 15b. And a power converter 16 (see FIG. 4).
The power converter 16 can supply, for example, a three-phase high-voltage power supply with a line voltage of 3.3 kV or 6.6 kV to an AC load 28 such as an induction motor. For example, three power converters 16 are provided for each output phase, and each has a cell inverter (an example of a unit power converter) 19 for converting each output of the input transformer 14 (see FIG. 3). .
A second front door 27b for maintaining the internal power converter 16 is provided on the right side of the front surface of the second casing 15b of the power converter 12.

The control unit 13 shown in FIG. 1 includes a third housing portion 15c located on the right side when the inverter 10 is viewed from the front, and a control device 18 provided inside the third housing portion 15c (see FIG. 4). have.
The control device 18 is connected to the cell inverter 19 of the power converter 16 by a plurality of optical communication lines 17. The control device 18 can cause the power converter 16 to perform a power conversion operation by transmitting a necessary signal to each cell inverter 19 via optical communication.
Moreover, the control apparatus 18 can monitor the voltage, electric current, temperature, etc. of the predetermined location inside each cell inverter 19 with a predetermined period via optical communication.
A third front door 27c for maintaining the internal control device 18 is provided on the front surface of the third casing 15c of the control unit 13.

As shown in FIG. 1, the inverter 10 has, for example, three first dustproof filter devices 20 a on the front surface of the first housing portion 15 a. Further, the inverter 10 includes, for example, three second dustproof filter devices 20b in the second front door 27b of the second housing portion 5b.
The inverter 10 includes, for example, three first exhaust devices 30a and a first preliminary exhaust device 32a in the ceiling portion of the first housing portion 15a (see FIG. 2). The first preliminary exhaust device 32a is a preliminary exhaust device that operates when any one of the three first exhaust devices 30a fails. Only one first preliminary exhaust device 32a is provided.
Further, the inverter 10 includes, for example, two second exhaust devices 30b and a second preliminary exhaust device 32b in the ceiling portion of the second housing portion 15b. The second preliminary exhaust device 32b is a preliminary exhaust device that operates when any one of the second exhaust devices 30b fails. Only one second preliminary exhaust device 32b is provided.

  The air sucked from the first filter device 20a (see FIG. 1) mainly cools the input transformer 14 (see FIG. 4) inside the first housing portion 15a, and the first exhaust device 30a makes the first 1 is discharged from the casing 15a. Further, the air sucked from the second filter device 20b mainly cools the cell inverter 19 inside the second housing portion 15b, for example, as shown by the arrow in FIG. 3, and the second exhaust device 30b. Is discharged from the second casing portion 15b.

Next, the first exhaust device 30a, the first preliminary exhaust device 32a, the second exhaust device 30b, and the second preliminary exhaust device 32b will be described in detail.
The first exhaust device 30a, the first preliminary exhaust device 32a, the second exhaust device 30b, and the second preliminary exhaust device 32b are respectively connected to an exhaust fan 36, as shown in FIGS. And an elastic member 50 and a plate-like member 52.

  As shown in FIGS. 8 and 9, each exhaust fan 36 is connected to the first and second housing portions via an exhaust fan fixing member 44 attached to a ceiling plate 42 that forms the ceiling portion of the housing 21. It is attached to the lower side of the ceiling plate 42 of 15a, 15b. The exhaust fan 36 can exhaust the air inside the casing 21 upward from an exhaust hole 46 (see FIG. 2) formed in the ceiling plate 42 of the casing 21. The exhaust hole 46 provided with the first and second exhaust devices 30a and 30b is an example of the first exhaust hole. The exhaust hole 46 provided with the first and second preliminary exhaust devices 32a and 32b is an example of a second exhaust hole.

  The exhaust fan 36 has a rotation sensor (not shown) that outputs a pulse signal according to the number of rotations. This rotation sensor is connected to the control device 18. Therefore, when the pulse signal from the rotation sensor is not received, or when the interval for receiving the pulse signal deviates from a predetermined range, the control device 18 determines that the exhaust fan 36 has failed. be able to.

As shown in FIGS. 5 and 7, the elastic member 50 is a plate material made of an elastic body and extending in one direction. When viewed in plan, the elastic member 50 crosses the upper side of the central portion of the exhaust hole 46 and is fixed to the ceiling plate 42 via the frame 53. The material of the elastic member 50 is, for example, chloroprene.
At both ends of the elastic member 50, for example, four holes (not shown) into which the hexagon bolts 54 are inserted are formed along the longitudinal direction.

The plate-like members 52 are fixed to both sides of the elastic member 50, respectively. Holes (not shown) corresponding to the four holes of the elastic member 50 are formed on one end side of the plate-like member 52.
One end of the plate-like member 52 is fixed to the upper surface of the end of the elastic member 50 in the width direction. With the elastic member 50 as a boundary, one side (the right side in FIG. 7) and the other side (the left side in FIG. 7) of the exhaust hole 46 can be closed.
Specifically, the plate-like member 52 is fixed to the elastic member 50 as follows. The elastic member 50 is sandwiched between one end side of the plate-like member 52 and the pressing plate 55 (see FIG. 6). The four hexagon bolts 54 pass through the holes of the elastic member 50 and the holes of the plate-like member 52, respectively, and are fastened to the burring tap formed on the holding plate 55, so that the plate-like member 52 is fixed to the elastic member 50. Is done.
Thus, each plate member 52 is fixed to the elastic member 50 at one end thereof. Therefore, when the pressure of the air exhausted by the exhaust fan 36 is received, the elastic member 50 bends and the other end side of each plate-like member 52 is lifted and opened (see FIGS. 5 and 6).

The first exhaust device 30a, the first preliminary exhaust device 32a, the second exhaust device 30b, and the second preliminary exhaust device 32b are respectively plate-shaped members that open by receiving the pressure of the air exhausted by the exhaust fans 36. It further has a stopper 56 for limiting the opening degree of 52.
As shown in FIG. 7, the stopper 56 has two pressing portions 56 b that come into contact with the fixed portion 56 a and the opened plate-like member 52.
The fixing portion 56a is a portion for fixing the stopper 56 to the elastic member 50 with a hexagon bolt 57 (see FIGS. 6 and 7).
Each pressing portion 56b extends obliquely upward from both ends of the fixing portion 56a in a side view (see FIG. 8). As shown in FIG. 7, the pressing portion 56 b is formed so that an intermediate portion in the longitudinal direction protrudes in a direction perpendicular to the longitudinal direction when viewed in plan. An escape hole 58 for avoiding interference with the head of the hexagon bolt 54 is formed in the intermediate portion.
Note that the pressing portion 56b does not necessarily have to be formed so that an intermediate portion in the longitudinal direction protrudes in a direction perpendicular to the longitudinal direction in plan view.

  Next, the operations of the first exhaust device 30a, the first preliminary exhaust device 32a, the second exhaust device 30b, and the second preliminary exhaust device 32b, particularly the first and second exhaust devices 30a, 30b are abnormal. The operation in the case of occurrence of this will be described. However, since the second exhaust device 30b and the second auxiliary exhaust device 32b operate in the same manner as the first exhaust device 30a and the first auxiliary exhaust device 32a, the first exhaust device 30a and the first auxiliary exhaust device 32b are operated. Only the exhaust device 32a will be described.

First, when the inverter 10 is not operating, none of the exhaust fans 36 operates, and the plate-like members 52 of the first exhaust device 30a and the first preliminary exhaust device 32a are shown in the upper diagram of FIG. In this way, the exhaust holes 46 are respectively closed.
Next, when all the exhaust fans 36 of the first exhaust device 30a are operating (when no abnormality occurs in any of the exhaust fans 36), the exhaust fans of the first preliminary exhaust device 32a. 36 has stopped operation. The plate-like member 52 of the first preliminary exhaust device 32a closes the exhaust hole 46 as shown in the upper diagram of FIG. In the first exhaust device 30a, since the exhaust fan 36 is operating, the plate-like members 52 are opened by receiving the wind pressure of the air discharged by the exhaust fan 36.

  Here, for example, when the rotation of one of the exhaust fans 36 in the first exhaust device 30a stops, for example, the control device 18 cannot receive the pulse signal output from the rotation sensor. It is determined that an abnormality has occurred in the exhaust fan 36. Thereafter, the control device 18 stops the operation of the exhaust fan 36 that is determined to be abnormal. Specifically, the control device 18 prevents the drive current of the exhaust fan 36 from flowing. The plate-like member 52 of the first exhaust device 30a that has been determined to have an abnormality does not receive air pressure when the operation of the exhaust fan 36 is stopped. As a result, the other end side of the plate-like member 52 moves downward (the plate-like member 52 is closed) and closes the exhaust hole 46.

  Thereafter, the control device 18 starts the operation of the exhaust fan 36 of the first preliminary exhaust device 32a. When the exhaust fan 36 of the first preliminary exhaust device 32a starts operation, the plate-like member 52 is gradually opened by receiving the wind pressure of the air discharged by the exhaust fan 36 as shown in the middle diagram of FIG. While the exhaust fan 36 is operating at a predetermined rotational speed, the plate-like member 52 is in contact with the stopper 56 as shown in the lower diagram of FIG. Therefore, the plate-like member 52 does not flutter and fatigue of the elastic member 50 is suppressed.

As shown in the present embodiment, since the plate-like member 52 of the exhaust device that is determined to have an abnormality blocks the exhaust hole 46, the inflow of air from the exhaust hole 46 is suppressed. That is, a decrease in the sealing property of the casing 21 is suppressed, and a decrease in the cooling efficiency of the inverter 10 is suppressed.
Further, before the inverter 10 is installed, the plate-like member 52 is not opened, so that an increase in the vertical dimension is suppressed.

Subsequently, an inverter according to a second embodiment of the present invention will be described. The same components as those of the inverter 10 according to the first embodiment are denoted by the same reference numerals and detailed description thereof is omitted.
As shown in FIGS. 11 to 13, the inverter according to this embodiment is different from the inverter 10 according to the first embodiment in that only one plate-like member of each exhaust device and each preliminary exhaust device is provided. Is different.

As shown in FIGS. 11 and 13, the elastic member 150 to which the plate member is fixed is a plate material made of an elastic body and extending in one direction. The elastic member 150 is disposed along the end of the exhaust hole 46 (see FIG. 2) via the frame 53 when viewed in plan. The material of the elastic member 150 is, for example, chloroprene.
At the end of the elastic member 150 on the exhaust hole 46 side, for example, four holes (not shown) into which the hexagon bolts 54 are inserted are formed along the longitudinal direction.

Only one plate member 152 is fixed to the upper surface of the end portion of the elastic member 150 on the exhaust hole 46 side, and the exhaust hole 46 can be closed. Holes (not shown) corresponding to the four holes of the elastic member 150 are formed on one end side of the plate-like member 152.
Specifically, the plate-like member 152 is fixed to the elastic member 150 as follows. The elastic member 150 is sandwiched between one end side of the plate-like member 152 and the pressing plate 55 (see FIG. 12). The four hexagon bolts 54 pass through the hole of the elastic member 150 and the hole of the plate-like member 152, respectively, and are fastened to the burring tap formed on the holding plate 55, whereby the plate-like member 152 is fixed to the elastic member 150. Is done.
As described above, one end of the plate-like member 152 is fixed to the elastic member 150. Therefore, when the pressure of the air exhausted by the exhaust fan 36 is received, the elastic member 150 bends and the other end side of the plate-like member 152 is lifted and opened (see FIGS. 11 and 12).

The first exhaust device, the first preliminary exhaust device, the second exhaust device, and the second preliminary exhaust device respectively open the plate-like member 152 that opens by receiving the pressure of the air exhausted by each exhaust fan 36. It further has a stopper 156 for limiting the above.
As shown in FIG. 13, the stopper 156 has a pressing portion 156 b that contacts the fixed portion 156 a and the opened plate-like member 152.
The fixing portion 156a is a portion for fixing the stopper 156 to the elastic member 150 with a hexagon bolt 57 (see FIGS. 12 and 13).
The pressing portion 156b extends obliquely upward from the exhaust hole 46 side of the fixing portion 156a when viewed from the side (see FIG. 12). As shown in FIG. 13, the pressing portion 156 b is formed so that an intermediate portion in the longitudinal direction protrudes in a direction orthogonal to the longitudinal direction when viewed in plan. An escape hole 58 for avoiding interference with the head of the hexagon bolt 54 is formed in the intermediate portion.
Note that the pressing portion 156b does not necessarily have to be formed so that the intermediate portion in the longitudinal direction protrudes in a direction orthogonal to the longitudinal direction in plan view.

  Next, the operations of the first exhaust device, the first preliminary exhaust device, the second exhaust device, and the second preliminary exhaust device, particularly the operation when an abnormality occurs in the first and second exhaust devices. explain. However, since the second exhaust device and the second preliminary exhaust device operate in the same manner as the first exhaust device and the first preliminary exhaust device, only the first exhaust device and the first preliminary exhaust device will be described. To do.

First, when the inverter 10 is not operating, none of the exhaust fans 36 operates, and the plate-like member 152 of the first exhaust device and the first preliminary exhaust device is as shown in the upper diagram of FIG. The exhaust holes 46 are respectively closed.
Next, when all the exhaust fans 36 of the first exhaust device are operating (when no abnormality occurs in any of the exhaust fans 36), the exhaust fans 36 of the first preliminary exhaust device are Operation is stopped. The plate member 152 of the first preliminary exhaust device closes the exhaust hole 46 as shown in the upper diagram of FIG. In the first exhaust device, since the exhaust fan 36 is operating, the plate member 152 is opened by receiving the wind pressure of the air discharged by the exhaust fan 36.

  Here, if the rotation of one of the exhaust fans 36 of the first exhaust device stops due to some cause, for example, the control device 18 (see FIG. 4) cannot receive the pulse signal output from the rotation sensor, and the control The device 18 determines that an abnormality has occurred in the exhaust fan 36. Thereafter, the control device 18 stops the operation of the exhaust fan 36 that is determined to be abnormal. Specifically, the control device 18 prevents the drive current of the exhaust fan 36 from flowing. The plate-like member 152 of the first exhaust device that is determined to have an abnormality does not receive air pressure when the operation of the exhaust fan 36 is stopped. As a result, the other end side of the plate-like member 152 moves downward (the plate-like member 152 is closed) and closes the exhaust hole 46.

  Thereafter, the control device 18 starts the operation of the exhaust fan 36 of the first preliminary exhaust device. When the exhaust fan 36 of the first preliminary exhaust device starts operation, the plate-like member 152 is gradually opened by receiving the wind pressure of the air discharged by the exhaust fan 36 as shown in the middle diagram of FIG. While the exhaust fan 36 is operating at a predetermined rotational speed, the plate member 152 is in contact with the stopper 156 as shown in the lower diagram of FIG. Therefore, the plate-like member 152 does not flutter and fatigue of the elastic member 150 is suppressed.

As shown in the present embodiment, since the plate-like member 152 of the exhaust device that is determined to have an abnormality blocks the exhaust hole 46, the inflow of air from the exhaust hole 46 is suppressed. That is, a decrease in the sealing property of the casing 21 is suppressed, and a decrease in the cooling efficiency of the inverter is suppressed.
Further, before the inverter 10 is installed, the plate-like member 152 is not opened, so that an increase in the vertical dimension is suppressed.

  In addition, this invention is not limited to the above-mentioned embodiment, The change in the range which does not change the summary of this invention is possible. For example, a case where the invention is configured by combining some or all of the above-described embodiments and modifications is also included in the technical scope of the present invention.

In each of the above-described embodiments, the first exhaust device, the first preliminary exhaust device, the second exhaust device, and the second preliminary exhaust are applied to the first and second casing portions 15a and 15b, respectively. Although the apparatus was provided, it is not limited to this. Arrangement | positioning of a housing | casing part and an exhaust apparatus may be arbitrary.
Furthermore, the first to third casing portions 15a to 15c are not limited to being connected to form one casing.

Other examples of the electric equipment include a robot control device, a pump control device, a machine tool control device, a plant control device, a disaster prevention monitoring system control device, and a switchboard.
As still another example of the electric equipment, an electronic computer housed in a server rack can be cited.

  Note that the inverter 10 described in the above-described embodiment may be conventionally called an “inverter control panel”.

10: inverter, 11: input transformer section, 12: power conversion section, 13: control section, 14: input transformer, 15a: first casing section, 15b: second casing section, 15c: third casing Body part, 16: power converter, 17: optical communication line, 18: control device, 19: cell inverter, 20a: first filter device, 20b: second filter device, 21: housing, 22: primary Winding, 24: commercial power supply, 26: secondary winding, 27a: first front door, 27b: second front door, 27c: third front door, 28: AC load, 30a: first exhaust Device 30b: second exhaust device 32a: first preliminary exhaust device 32b: second preliminary exhaust device 36: exhaust fan 42: ceiling plate 44: exhaust fan fixing member 46: exhaust hole 50: elastic member, 52: plate-like member, 53: frame, 54: hexagon bolt, 55: Even plate, 56: stopper, 56a: fixing part, 56b: pressing part, 57: hexagon bolt, 58: escape hole, 150: elastic member, 152: plate member, 156: stopper, 156a: fixing part, 156b: pressing Part

Claims (7)

A housing having first and second exhaust holes formed at the top;
An exhaust device provided in the first exhaust hole;
A preliminary exhaust device provided in the second exhaust hole and substituting for the exhaust device;
The exhaust device and the preliminary exhaust device, respectively, an exhaust fan that exhausts air inside the housing to the outside from the first and second exhaust holes;
An elastic member fixed to the housing;
A plate-like member having one end fixed to the elastic member and covering the first and second exhaust holes ;
An electric device comprising: a stopper that restricts the degree of opening of the plate-like member that is opened by receiving the pressure of air discharged from the exhaust fan . The electric device according to claim 1 , wherein the stopper is provided on the elastic member. A housing having first and second exhaust holes formed at the top;
An exhaust device provided in the first exhaust hole;
A preliminary exhaust device provided in the second exhaust hole and replacing the exhaust device ;
A control device that operates the exhaust fan of the preliminary exhaust device after determining that an abnormality has occurred in the exhaust fan of the exhaust device , and
The exhaust device and the preliminary exhaust device, respectively, an exhaust fan that exhausts air inside the housing to the outside from the first and second exhaust holes;
An elastic member made of chloroprene and fixed to the housing;
An electric device having a plate-like member having one end fixed to the elastic member and covering the first and second exhaust holes. 4. The electric device according to claim 3 , wherein only one plate member is provided. A housing having first and second exhaust holes formed at the top;
An exhaust device provided in the first exhaust hole;
A preliminary exhaust device provided in the second exhaust hole and substituting for the exhaust device;
The exhaust device and the preliminary exhaust device, respectively, an exhaust fan that exhausts air inside the housing to the outside from the first and second exhaust holes;
An elastic member fixed to the housing across the first and second exhaust holes in plan view;
An electric device having a plurality of plate-like members having one end portions fixed to the elastic member and covering the first and second exhaust holes. A housing having first and second exhaust holes formed at the top;
An exhaust device provided in the first exhaust hole;
A preliminary exhaust device provided in the second exhaust hole and substituting for the exhaust device;
The exhaust device and the preliminary exhaust device, respectively, an exhaust fan that exhausts air inside the housing to the outside from the first and second exhaust holes;
A plate material fixed to the housing and made of an elastic body;
An electric device having a plate-like member having one end fixed to the plate and covering the first and second exhaust holes. An input transformer unit having an input transformer connected to a commercial power source;
A power converter having a unit power converter for power converting the output of the input transformer,
The input transformer unit and the power conversion unit, respectively, a housing having first and second exhaust holes formed in the upper part,
An exhaust device provided in the first exhaust hole;
A preliminary exhaust device that is provided in the second exhaust hole and replaces the exhaust device;
The exhaust device and the preliminary exhaust device, respectively, an exhaust fan that exhausts air inside the housing to the outside from the first and second exhaust holes;
An elastic member fixed to the housing across the first and second exhaust holes in plan view;
A power conversion device having a plurality of plate-like members having one end side fixed to the elastic member and covering the first and second exhaust holes.

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