JPH0580107U - Intake device for closed switchboard - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain sufficient ventilation without reducing the air intake area and increasing the fan rating. [Structure] An exhaust fan provided in a box body 2 of a closed switchboard, an intake port 5 transparently provided in a plate body 7 of the box body 2, and a dustproof air filter 8 having an area sufficiently larger than the area of the intake port 5. A frame 9 to which the peripheral edge of the filter 8 is fixed; With.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a switchgear intake device having a high intake efficiency as compared with the area of an intake port.

[0002]

[Prior Art]

 The conventional intake device for a closed switchboard has a configuration shown in FIG. In the figure, 1 is a channel base, 2 is a box body, 3 is a door that opens and closes the front opening of the box body 2, 4 is a flat handle of the door 3, 5 is an intake port that is transparently provided under the door 3, 6 Is a dust-proof air filter closely attached to the back surface of the door 3 so as to cover the intake port 5. The effective area of the filter 6 is the same as that of the intake port 5, and an exhaust fan is provided at the ceiling of the box body 2 By this, the outside air is sucked in and discharged from the intake port 5, and the heat of various electric devices generated inside the box body 2 is released.

[0003]

[Problems to be solved by the device]

 In the conventional device described above, when the amount of heat generated inside the box body 2 is large and the ventilation amount is increased, if the wind speed of the fan is increased, the pressure loss in the filter 5 becomes large and a sufficient ventilation amount cannot be obtained. In addition, in order to obtain a sufficient ventilation without increasing the fan rating, the area of the air inlet must be increased, and the air inlet occupies most of the lower area of the door 3, so that the box There is a problem that the aesthetics of the body 2, especially the door 3 is impaired.

The present invention has been made in consideration of the above points, and an object thereof is to provide an intake device of a closed switchboard with a small intake port area and a high intake efficiency that can obtain a sufficient ventilation amount without increasing the fan rating. And

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, an air intake device for a closed switchboard according to the present invention is provided with an exhaust fan provided in a switchgear box body, an intake port penetrating the plate body of the box body, and an area of the intake port. A dust-proof air filter with a sufficiently larger area, a frame to which the peripheral edge of the filter was fixed, and at least a part of the frame separated from the back of the plate, and the frame was attached to the plate at the periphery of the intake port. And a support.

[0006]

[Action]

 In the air intake device for the closed switchboard of the present invention constructed as described above, the area of the dustproof air filter is sufficiently larger than the area of the air inlet, and at least a part of the frame body fixed to the periphery of the filter is the support member. Since it is installed away from the back surface of the plate of the intake port, even if the wind speed of the outside air passing through the intake port increases, the pressure loss of the filter is small, and the ventilation rate is sufficient without increasing the fan rating. The intake area is relatively small, the appearance is not impaired, and the intake efficiency is good.

[0007]

【Example】

 One embodiment will be described with reference to FIGS. 1 and 2. In these figures, the same symbols as those in FIG. 3 indicate the same or corresponding ones. Reference numeral 7 is a plate body which is a door on the front of the box body 2, 8 is a dust-proof air filter having a sufficiently larger area than an intake port provided at the bottom of the plate body 7, and 9 is a frame to which the peripheral portion of the filter 8 is fixed. The body 10 is a support body, and at least a part of the frame body 9 is separated from the back surface of the plate body 7, and the frame body 9 is attached to the plate body 7 at the peripheral portion of the intake port 5. Reference numeral 11 denotes a rectangular bottom plate that constitutes the support 10, and is connected to the lower edge of the frame 9 by bending. Reference numeral 12 denotes two triangular side plates constituting the support body 10, which are connected to the side edges of the frame body 9 by bending. Reference numeral 13 denotes two mounting plates connected to the edges of both side plates 12 by bending. The mounting plate 1 is provided so that the filter 8, the frame body 9, and the support body 10 cover the intake port 5 of the frame body 7. 3 is attached to the back surface of the plate body 7.

In this case, the area of the filter 8 is about twice the area of the intake port 5, and since the filter 8 is arranged obliquely upward, the air passing through the intake port 5 has about twice the area. The pressure loss of the filter 8 is extremely small as it flows into the center of the box body 2 through the filter 8. The shape of the support 10 is not limited to that shown in the figure, but the same shape as the bottom plate 11 may be used as an upper plate, a rectangular side plate may be used, and the filter 8 may be arranged in parallel with the plate 7.

[0009]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects. In the intake device of the closed switchboard of the present invention, the area of the dustproof air filter 8 is sufficiently larger than the area of the intake port 5, and at least a part of the frame body 9 to which the periphery of the filter 8 is fixed is supported by the support body 10. Since it is mounted away from the back surface of the plate body 7, even if the wind speed of the outside air passing through the intake port 5 increases, the pressure loss of the filter 8 can be reduced, and the fan rating can be increased without increasing. Ventilation amount can be obtained, the area of the intake port 5 can be reduced, and the appearance can be prevented from being impaired, so that the intake efficiency can be improved.

[Brief description of drawings]

1A and 1B are a front view and a cut side view of an embodiment of the present invention.

FIG. 2 is a perspective view of a part of FIG. 1 viewed from the back.

3A and 3B are a front view and a cut side view of a conventional example.

[Explanation of symbols]

 2 Box 5 Air intake 7 Plate 8 Dust-proof air filter 9 Frame 10 Support

Claims (1)

[Scope of utility model registration request] 1. An exhaust fan provided in a box body of a closed switchboard, an intake port provided through a plate body of the box body, and a dustproof air filter having an area sufficiently larger than the area of the intake port. A frame body to which a peripheral portion of the filter is fixed; and a support body in which at least a part of the frame body is separated from the back surface of the plate body and the frame body is attached to the plate body at the peripheral portion of the intake port. Intake device for closed switchboard.