JP7124499B2 - Board housing and ventilator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel housing for housing power equipment and a ventilator attached to the panel housing.

For example, power facilities such as power receiving and transforming facilities installed in buildings and factories are equipped with various power devices such as circuit breakers and transformers. See Patent Document 1).

JP-A-2003-219522

By the way, the power equipment as described above is also installed in a place subject to salt damage. Power equipment installed in such places is provided with a salt resistant filter. Since the salt resistant filter has a large pressure loss, the temperature inside the housing tends to rise. Therefore, it is required to suppress the internal temperature rise by increasing the exhaust area and the exhaust amount.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a board housing and a ventilator capable of suppressing an internal temperature rise.

A board housing for solving the above-mentioned problems is a board housing for housing electric power equipment, comprising a main body in which the electric power equipment is arranged, a door attached to the main body, and an exterior of the door. A louver member and a dust removal filter attached to the side surface via a frame-shaped ventilation box, and a salt-resistant filter attached to the inner surface of the door.

According to this configuration, the ventilation box prevents the louver member, the dust removal filter, and the salt-resistant filter from interfering with the constituent members inside the door body, so that a large louver member, dust-removing filter, and salt-resistant filter can be used. become. Therefore, the amount of ventilation increases, and the temperature rise in the board housing is suppressed.

In the board housing, the louver member preferably has at least an outer louver member and an inner louver member arranged closer to the door than the outer louver member.
According to this configuration, it is possible to suppress the intrusion of water into the inside of the board housing.

In the board housing described above, it is preferable that the outer louver member and the inner louver member are arranged so that their through holes do not overlap.
According to this configuration, intrusion of water is further suppressed.

In the board housing described above, it is preferable that the dust removal filter is arranged between the outer louver member and the inner louver member.
According to this configuration, the dust removal filter is sandwiched between the outer louver member and the inner louver member, so that a compact structure can be achieved.

In the panel housing described above, the ventilation box includes an attached portion to which the louver member and the dust removal filter are attached, and an outer frame body provided with a peripheral wall surrounding the peripheral edge of the attached portion. and an inner frame body having a mounting portion attached to the door body and a peripheral wall provided so as to surround the peripheral edge of the mounting portion, wherein the lower wall constituting the peripheral wall of the outer frame body is a lower wall forming the peripheral wall of the inner frame is inclined so that the tip is positioned lower than the base end; The outer frame and the inner frame are arranged so that the lower wall of the inner frame and the lower wall of the outer frame constitute a bent passage in which the lower wall of the inner frame enters the outer frame. preferably.

According to this configuration, the water that has entered the ventilation box flows down from the ventilation box to the outside through the bent passages (so-called labyrinthine passages) at the bottom of the ventilation box. In addition, the labyrinth structure prevents water from entering from the bottom of the ventilation box.

A ventilation device that solves the above problems is a ventilation device that is attached to a panel housing that houses power equipment, and includes a frame-shaped ventilation box and a mounting part provided on one side of the ventilation box in the thickness direction. A louver member and a dust removal filter attached thereto, and a salt resistant filter provided on the other side in the thickness direction of the ventilation wall are provided.

According to this configuration, the ventilation box prevents the louver member, the dust removal filter, and the salt-resistant filter from interfering with the constituent members of the door body, so that a large louver member, the dust removal filter, and the salt-resistant filter can be used. Become. Therefore, the amount of ventilation increases, and the temperature rise in the board housing is suppressed.

ADVANTAGE OF THE INVENTION According to this invention, the board housing|casing and ventilation apparatus which can suppress an internal temperature rise can be provided.

(a) is a schematic front view of a switchboard, (b) is a schematic cross-sectional side view of the switchboard, and (c) is a schematic rear view of the switchboard. A partially enlarged front view of the front door body. A partially enlarged rear view of the front door body. Partially enlarged side cross-sectional view of the front door body. Partially enlarged sectional side view of the ventilator. FIG. 2 is an exploded perspective view of the ventilator; FIG. 3 is a schematic cross-sectional side view of another ventilator;

An embodiment will be described below with reference to the accompanying drawings.
It should be noted that the attached drawings may show constituent elements on an enlarged scale for easy understanding. The dimensional proportions of components may differ from those in reality or in other drawings. Also, in cross-sectional views, hatching of some components may be omitted for easy understanding.

The switchboard 1 shown in FIGS. 1(a), 1(b), and 1(c) constitutes, for example, a power receiving and transforming facility installed outdoors such as a building or a factory. is. The distribution board 1 may be a power receiving board, a VCT board, a transformer secondary board, a bus connection board, or the like.

The switchboard 1 has a board housing 2 and a plurality of power devices 3 accommodated in the board housing 2 . The board housing 2 includes a main body 10 in which the power equipment 3 is arranged, a front door 11 as a door provided on the front side of the main body 10 (left side in FIG. 1(b)), and a main body 10 and a rear door body 12 as a door body. In this embodiment, the board housing 2 accommodates busbars (R, S, T) 4 and circuit breakers (VCB) 5a and 5b as power equipment. A control room 6 is provided between the circuit breakers 5a and 5b and the front door 11 .

As shown in FIG. 1A, the front door 11 can be opened and closed by operating an open/close lever 11a provided on the front door 11. As shown in FIG. An opening/closing door 11b for maintenance is provided in the central portion of the front door 11, and an indicator lamp 11c is provided in the upper part of the front door 11. As shown in FIG. A ventilation device 21 is attached to the lower portion of the front door 11 .

As shown in FIG. 1(c), the rear door 12 can be opened and closed by operating an open/close lever 12a provided on the rear door 12. As shown in FIG. Two ventilators 22 are attached to the back door 12 . The two ventilators 22 attached to the back door 12 have the same configuration as the ventilator 21 attached to the front door 11 . Therefore, the ventilation device 21 of the front door 11 will be described in detail, and detailed drawings and description of the ventilation device 22 of the rear door 12 will be omitted.

As shown in FIGS. 4 and 6, a ventilation opening 11d is formed in the front door 11, and a ventilation device 21 is attached to the ventilation opening 11d.
The ventilation device 21 includes louver members 30 and 50, a dust removal filter 40, a ventilation box 60, and a salt resistant filter . In this embodiment, the louver members 30 and 50 and the dust removal filter 40 are attached to the outside of the front door 11 via the ventilation box 60, and the salt resistant filter 70 is attached to the inside of the front door 11. there is

As shown in FIGS. 4 and 5, the ventilator 21 of this embodiment has a structure in which a dust removal filter 40 is arranged between two louver members 30 and 50 . In the following description, of the two louver members 30 and 50, the louver member 30 outside the dust removing filter 40 may be called the outer louver member, and the louver member 50 inside the dust removing filter 40 may be called the inner louver member. be.

As shown in FIGS. 2 and 6, the outer louver member 30 is square shaped. As shown in FIGS. 5 and 6 , the outer louver member 30 includes a body plate 31 and a frame-shaped mounting portion 32 integrally provided around the body plate 31 . As shown in FIG. 5, the body plate 31 is provided with a plurality of vents 33 . The plurality of vents 33 are arranged in rows adjacent to each other in the horizontal direction. Each ventilation part 33 is composed of a through hole 33a provided in the main body plate 31 and a blade plate 33b covering the through hole 33a. A through hole 33a of each vent 33 has a shape extending in the horizontal direction. The wing plate 33b protrudes outward from the body plate 31 and opens downward. The blade 33b has a curved shape along the shape of the through hole 33a. The outer louver member 30 of this embodiment is integrally formed from a metal material. The outer louver member 30 can be formed, for example, by stamping and bending a metal plate.

As shown in FIG. 6, the inner louver member 50 has a square shape. As shown in FIGS. 5 and 6 , the inner louver member 50 includes a body plate 51 and a frame-shaped mounting portion 52 integrally provided around the body plate 51 . As shown in FIG. 5, the body plate 51 is provided with a plurality of vents 53 . The plurality of vents 53 are arranged in rows adjacent to each other in the horizontal direction. Each ventilation part 53 is composed of a through hole 53a provided in the main body plate 51 and a blade plate 53b covering the through hole 53a. A through-hole 53a of each ventilation part 53 has a shape extending in the horizontal direction. The wing plate 53b protrudes inside the body plate 51 and opens upward. The blade plate 53b has a curved shape along the shape of the through hole 53a. The inner louver member 50 of this embodiment is integrally formed from a metal material. The inner louver member 50 can be formed, for example, by stamping and bending a metal plate.

As shown in FIG. 6, the dust removal filter 40 has a square shape. The dust removal filter 40 is attached to the ventilation box 60 together with the outer louver member 30 and the inner louver member 50 by fastening members 91 (bolts). In the present embodiment, the outer louver member 30 and the inner louver member 50 are arranged so that their through holes 33a and 53a overlap.

As shown in FIGS. 4 to 6, the ventilation box 60 is composed of an outer frame 61 and an inner frame 64. As shown in FIG.
As shown in FIG. 5 , the outer frame 61 includes a frame-shaped attached portion 62 and a peripheral wall 63 that surrounds the peripheral edge of the attached portion 62 . The attachment portion 32 of the outer louver member 30 , the dust removal filter 40 , and the attachment portion 52 of the inner louver member 50 are fastened and fixed to the attached portion 62 of the outer frame 61 by fastening members 91 . Therefore, the dust removal filter 40 is sandwiched between the outer louver member 30 and the inner louver member 50 .

The peripheral wall 63 of the outer frame 61 includes side walls 63a and 63b extending vertically along the mounting portion 62, an upper wall 63c provided at the upper end of the mounting portion 62 and extending in the horizontal direction, and a lower end of the mounting portion 62. and a lower wall 63d provided at the bottom wall 63d. The side walls 63 a and 63 b are formed to stand substantially perpendicularly from the attached portion 62 . As shown in FIG. 5, the upper wall 63c is formed to stand up from the attached portion 62 so that the angle between the upper wall 63c and the attached portion 62 is larger than a right angle. Similarly, the lower wall 63d is formed to stand up from the attached portion 62 so that the angle formed by the lower wall 63d and the attached portion 62 is larger than a right angle.

As shown in FIG. 5 , the inner frame 64 includes a frame-shaped attachment portion 65 and a peripheral wall 66 that surrounds the periphery of the attachment portion 65 .
A peripheral wall 66 of the inner frame 64 includes side walls 66a and 66b extending vertically along the mounting portion 62, an upper wall 66c provided at the upper end of the mounting portion 62 and extending in the horizontal direction, and a lower end of the mounting portion 62. and a lower wall 66d provided at the bottom wall 66d. The side walls 66 a and 66 b are formed to stand substantially perpendicularly from the attached portion 62 . As shown in FIG. 5, the upper wall 66c is formed to stand up from the attached portion 62 so that the angle between the upper wall 66c and the attached portion 62 is larger than a right angle. Similarly, the lower wall 66d is formed to stand up from the attached portion 62 so that the angle formed by the lower wall 66d and the attached portion 62 is larger than a right angle.

The inner frame 64 is formed so that the peripheral wall 66 of the inner frame 64 can be arranged inside the peripheral wall 63 of the outer frame 61 . The inner frame 64 and the outer frame 61 are arranged so that the outer surfaces of the side walls 66a and 66b of the inner frame 64 and the inner surfaces of the side walls 63a and 63b of the outer frame 61 overlap each other. Also, the inner frame 64 and the outer frame 61 are arranged so that the tip of the peripheral wall 66 of the inner frame 64 (the left end in FIG. 5) is separated from the outer frame 61 . The ventilation box 60 is formed by fastening and fixing side walls 66a and 66b of the inner frame 64 and side walls 63a and 63b of the outer frame 61 with fastening members 92 (bolts and nuts). In the peripheral wall 63 of the outer frame 61 , the length from the attached portion 62 to the tip of the peripheral wall 63 is set equal to or shorter than the thickness of the ventilation box 60 .

As shown in FIG. 5, the ventilation box 60 is arranged on the front surface of the front door 11 via the packing 69 with the inner frame 64 facing the front door 11, and is secured to the front door by fastening members 93 (bolts and nuts). It is fixed to the front surface of the body 11 . The packing 69 is formed in a frame shape and interposed between the entire mounting portion 65 of the inner frame 64 and the front door 11 .

A packing 68 is provided between the upper wall 66 c of the inner frame 64 and the upper wall 63 c of the outer frame 61 . The packing 68 prevents water droplets and the like from entering the inside of the ventilation box 60 from above.

The tip of the lower wall 66d of the inner frame 64 is separated from the outer frame 61 to form a gap. The lower wall 66d of the inner frame 64 is formed so that the angle formed by the lower wall 66d and the mounting portion 65 is larger than a right angle. Therefore, the bottom wall 66d of the inner frame 64 is inclined such that the tip is located below the base end (the end on the mounting portion 65 side). Similarly, the lower wall 63d of the outer frame 61 is formed so that the angle formed by the lower wall 63d and the attached portion 62 is larger than a right angle. Therefore, the lower wall 63d of the outer frame 61 is inclined such that the tip is located below the base end (the end on the side of the attached portion 62). The tip of the lower wall 63 d of the outer frame 61 is separated from the front door 11 . The outer frame 61 and the inner frame 64 arranged in this way form a bent passage (a so-called labyrinth structure) in which the lower wall 63d of the outer frame 61 and the lower wall 66d of the inner frame 64 overlap in the vertical direction. aisles). This passage has a structure in which the internal space of the ventilation box 60 and the outside of the ventilation box 60 do not communicate linearly. Therefore, water droplets inside the ventilation box 60 flow down to the outside of the ventilation box 60 through the lower wall 66d of the inner frame 64 and the lower wall 63d of the outer frame 61, as indicated by the dashed arrows. On the other hand, from below the ventilation box 60, water droplets are prevented from entering the inside of the ventilation box 60 by the bent passage.

As shown in FIGS. 3 to 5, a salt resistant filter 70 is provided on the inner surface of the front door 11. As shown in FIGS.
As shown in FIG. 6, the salt resistant filter 70 has a rectangular plate shape. The salt resistant filter 70 is arranged in contact with the inner surface of the front door 11 and fixed to the front door 11 by a mounting member 71 .

As shown in FIG. 3 , the mounting member 71 is composed of mounting members 72 and 73 arranged above and below the salt-resistant filter 70 and mounting members 74 and 75 arranged on the left and right sides of the salt-resistant filter 70 . The mounting members 74 and 75 are composed of support portions 74a and 75a formed to extend along the left and right sides of the salt resistant filter 70, and upper and lower mounting portions 74b and 75b of the support portions 74a and 75a. As shown in FIG. 5, each mounting member 72, 73, 74, 75 is formed by bending a thin plate such as a metal plate.

Mounting members 72 , 73 , 74 , and 75 fix salt-resistant filter 70 to front door 11 by manual fastening members 95 above and below salt-resistant filter 70 . Therefore, as shown in FIG. 3, the width of the salt-resistant filter 70 does not interfere with the door rod rod 11e, the door reinforcing member 11f, etc., which are the structural members attached to the front door body 11. FIG. In other words, the switchboard 1 is equipped with a large salt-resistant filter 70 that does not interfere with the constituent members of the front door 11 . Manual fastening member 95 is, for example, a wing nut. The manual fastening member 95 is screwed into the screw member 11 s provided on the front door member 11 . Therefore, by using such a manual fastening member 95, the installation and removal of the salt resistant filter 70 is facilitated without the need for tools such as a screwdriver and a wrench. Also, the work time required for exchanging the salt resistant filter 70 can be shortened.

(action)
Next, the operation of the ventilator 21 in the switchboard 1 will be described.
The ventilation device 21 has an outer louver member 30 , an inner louver member 50 , a dust removal filter 40 , a ventilation box 60 and a salt resistant filter 70 .

The outer louver member 30 and the inner louver member 50 prevent rainwater from blowing into the switchboard 1 from the outside. In addition, by providing the outer louver member 30 and the inner louver member 50 , it is possible to prevent water from falling into the ventilation box 60 and adhering to the salt resistant filter 70 . The ventilation box 60 has a bent passageway at the bottom through which the water in the ventilation box 60 flows down to the outside of the panel housing 2 . Therefore, the ventilation box 60 is prevented from overflowing water. Also, the bent passage of the ventilation box 60 prevents water from entering the ventilation box 60 from the outside.

The dust removal filter 40 collects dust, which is typified by many dust particles present in the atmosphere. The salt-resistant filter 70 collects fine particles containing salt contained in the atmosphere.
The salt-resistant filter 70 can prevent salt from entering the inside of the switchboard 1 . In addition, accidents such as short circuits and ground faults due to salt damage can be suppressed.

The outer louver member 30 , the inner louver member 50 and the dust removal filter 40 are attached to the front surface of the front door 11 of the switchboard 1 via the ventilation box 60 . The salt resistant filter 70 is arranged in contact with the inner surface of the front door 11 and fixed to the front door 11 by a mounting member 71 . With such a configuration, the ventilation area of the ventilation device 21 can be secured, and the temperature rise inside the switchboard 1 can be suppressed.

For example, as a switchboard of a comparative example, one in which the outer louver member 30, the inner louver member 50, and the dust removing filter 40 are directly attached to the front door 11 can be considered. However, in such a mounting method, the salt-resistant filter 70 is located further inside the switchboard 1 than the mounting position of the present embodiment, so there is a risk of interference with power equipment accommodated in the switchboard 1 . Therefore, louver members and salt-resistant filters with large areas cannot be used. The salt resistant filter has a larger pressure loss than the dust removing filter 40 . Therefore, since sufficient air cannot be introduced into the switchboard 1, the temperature inside the switchboard 1 rises.

In contrast, in the present embodiment, the outer louver member 30, the inner louver member 50, and the dust removal filter 40 are attached to the front surface of the front door 11 of the switchboard 1 via the ventilation box 60, as described above. there is The salt-resistant filter 70 is arranged in contact with the inner surface of the front door 11 and fixed to the front door 11 by a mounting member 71 . Such a ventilator 21 does not interfere with the constituent members of the switchboard 1 , and the large-area salt-resistant filter 70 , the outer louver member 30 , and the like can be attached to the front door 11 . Therefore, the amount of air that can be introduced into the switchboard 1 increases, that is, a sufficient amount of ventilation can be secured, and the temperature rise inside the switchboard 1 can be suppressed.

For example, in the energization test, the temperature rise at a predetermined position of the switchboard 1 shown in FIG. 1(b) was measured. The measurement points were, for example, the inside of the control room 6, the contacts of the circuit breakers (VCB) 5a and 5b, and the connecting portion of the bus 4. In addition, if the allowable temperature rise with respect to the temperature at the time of starting is used as the criterion, the criterion is 20 (K) for the control chamber 6, 65 (K) for the circuit breakers 5a and 5b, and the bus 4. K). As a result of measuring the switchboard 1 of this embodiment, the temperature rise value in the control room 6 was 10 (K). Also, the temperature rises at the contacts of the circuit breakers (VCB) 5a and 5b were 52 (K) and 59 (K), respectively. The temperature rise at the connecting portion of the bus 4 was 40 (K). All of the above measurement results were below the criterion.

Further, when the outer louver member 30 and the like are directly attached to the front door member 11 as in the above-described comparative example, water accumulates between the outer louver member 30 and the inner louver member 50, and when the water overflows, the salt resistance is reduced. Water may adhere to the filter 70 or may enter the inside of the switchboard 1 .

In the ventilation device 21 of this embodiment, the outer louver member 30 and the dust removing filter 40 are attached to the ventilation box 60 . The outer louver member 30 suppresses the intrusion of jet water from the outside. The dust removal filter 40 arranged inside the outer louver member 30 can suppress the intrusion of dust from the outside and the infiltration of water. Therefore, it is possible to further suppress water from entering the inside of the switchboard 1 from the outside.

Also, the outer louver member 30 , the dust removal filter 40 and the inner louver member 50 are attached to the ventilation box 60 . The salt-resistant filter 70 is attached to the front door 11 and separated from the inner louver member 50 . Therefore, adhesion of water to the salt resistant filter 70 can be reduced.

As described above, according to this embodiment, the following effects are obtained.
(1) A ventilator 21 is attached to the front door 11 of the board housing 2 . The ventilator 21 includes an outer louver member 30 attached to the front door 11 via a frame-shaped ventilation box 60, a dust removal filter 40, and an inner louver member 50. As shown in FIG. The ventilator 21 also has a salt resistant filter 70 attached to the inner surface of the front door 11 .

The dust removal filter 40 and the salt-resistant filter 70 collect dust and salt content, thereby suppressing accidents due to salt damage. Since the ventilation box 60 prevents the louver members 30 and 50, the dust removing filter 40, and the salt-resistant filter 70 from interfering with the constituent members inside the front door 11, the louver members 30 and 50 and the dust removing filter 40 are large. , the salt resistant filter 70 can be used. Therefore, the amount of ventilation increases, and the temperature rise in the board housing 2 can be suppressed.

(2) The ventilator 21 has an outer louver member 30 and an inner louver member 50 . Therefore, it is possible to suppress the intrusion of water into the inside of the board housing 2 .
(3) The dust removal filter 40 is arranged between the outer louver member 30 and the inner louver member 50 . Therefore, the dust removing filter 40 is sandwiched between the outer louver member 30 and the inner louver member 50, so that the ventilator 21 can have a compact structure.

(4) The ventilation box 60 includes an outer frame 61 and an inner frame 64 . The outer frame 61 includes an attached portion 62 to which the louver members 30 and 50 and the dust removal filter 40 are attached, and a peripheral wall 63 provided so as to surround the peripheral edge of the attached portion 62 . The inner frame 64 includes an attachment portion 65 attached to the front door 11 and a peripheral wall 66 surrounding the periphery of the attachment portion 65 . A lower wall 63d that constitutes the peripheral wall 63 of the outer frame 61 is slanted so that the tip is located below the base. A lower wall 66d that constitutes the peripheral wall 66 of the inner frame 64 is slanted so that the tip is located below the base. The outer frame 61 and the inner frame 64 are arranged so that the lower wall 66d of the inner frame 64 and the lower wall 63d of the outer frame 61 form a bent passage. Therefore, the water that has entered the ventilation box 60 flows down from the ventilation box 60 to the outside through the bent passage at the bottom of the ventilation box 60 . In addition, the bent passage makes it difficult for water to enter from the lower portion of the ventilation box 60 . Therefore, water can be prevented from entering the ventilation box 60 . Also, water can be prevented from overflowing in the ventilation box 60 .

Note that the above embodiment may be implemented in the following aspects.
- You may change the number of louver members suitably with respect to the said embodiment. For example, the inner louver member 50 may be omitted. Moreover, it is good also as a structure provided with three or more louver members.

- In contrast to the above embodiment, the outer louver member 30 and the inner louver member 50 may be arranged so that the through hole 33a of the outer louver member 30 and the through hole 53a of the inner louver member 50 do not overlap each other. . Since the through-holes 33a and 53a do not overlap each other, it is possible to further suppress the entry of water.

- In contrast to the above embodiment, as shown in FIG. You can wear it.

2 Panel housing 11 Front door 21, 22, 100 Ventilator 30 Outer louver member 40 Dust removal filter 50 Inner louver member 60 Ventilation box 70 Salt resistant filter.

Claims (6)

A board housing for housing power equipment,
a main body on which the power equipment is arranged;
a door attached to the main body;
A louver member and a dust removal filter attached to the outer surface of the door via a frame-shaped ventilation box;
a salt-resistant filter attached to the inner surface of the door;
with
The ventilation box includes an outer frame body having a mounting portion to which the louver member and the dust removal filter are mounted, a peripheral wall provided so as to surround the periphery of the mounting portion, and an attachment mounted to the door body. and an inner frame body provided with a peripheral wall surrounding the peripheral edge of the mounting portion . 2. The board housing according to claim 1, wherein said louver member has at least an outer louver member and an inner louver member arranged closer to said door body than said outer louver member. 3. The board housing according to claim 2, wherein the outer louver member and the inner louver member are arranged so that their through holes do not overlap. 4. The board housing according to claim 2, wherein said dust removing filter is arranged between said outer louver member and said inner louver member. a lower wall that constitutes the peripheral wall of the outer frame is inclined so that the tip is positioned lower than the base end,
A lower wall that constitutes the peripheral wall of the inner frame is inclined so that the tip is positioned lower than the base end,
The outer frame and the inner frame are arranged so as to form a bent passage with the lower wall of the inner frame and the lower wall of the outer frame,
The board housing according to any one of claims 1 to 4, characterized in that: A ventilation device attached to a panel housing containing power equipment,
a frame-shaped ventilation box;
a louver member and a dust removal filter attached to a mounting portion provided on one side in the thickness direction of the ventilation box;
a salt-resistant filter provided on the other side of the ventilation box in the thickness direction;
with
The ventilation box includes an outer frame body including the attached portion to which the louver member and the dust removal filter are attached, a peripheral wall provided so as to surround the peripheral edge of the attached portion, and the outside of the board housing. A ventilator comprising: an inner frame body having a mounting portion attached to a side surface; and a peripheral wall provided so as to surround a peripheral edge of the mounting portion .

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