JP2563619B2 - Ventilation fan for duct - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a duct ventilation fan in which an outer box made of a colored steel plate is used.

(Prior Art) Generally, a ventilation fan for a duct has a structure in which an air blower is arranged in an outer box made of steel plate, and a drive motor of the air blower is attached to the upper plate of the outer box. For this reason, when the duct ventilation fan is attached to the ceiling of the building, the upper plate is grounded by screwing and connecting the ground wire, which is previously wired on the back of the ceiling, to the outer box. In this case, the ground wire is set to an appropriate length so as to hang down slightly below the mounting opening formed in the ceiling for mounting the duct ventilation fan. If you try to screw it to the upper plate directly from the outside, it will be necessary for another worker to screw the duct ventilation fan in the vicinity of the mounting port with the worker supporting it with your hand. There is a possibility that the fixing work will become difficult and that the screw cannot be surely fixed and that the earth will be incomplete. For this reason, usually, a hole is formed in the upper plate of the outer box, the ground wire is drawn into the outer box through this hole, and then the duct ventilation fan is fitted into the ceiling mounting port from below. The lead wire is then screwed to the side plate of the outer box. In this case, since the upper plate and the side plate are electrically connected to each other in the outer case made of a steel plate, the upper plate can be grounded.

By the way, recently, an outer box has been manufactured from a color steel plate because of advantages such as rust prevention. This conventional example is shown in FIGS. 6 to 10. That is, the outer box 1 is composed of a side frame 2 and an upper plate 3 made of color steel plates, respectively, and a flange portion 2a and a flange portion 2a formed on the peripheral portion of the upper surface opening of the side frame 2 and the peripheral portion of the upper plate 3, respectively. 3a is fitted and the fitted portion is joined by caulking. An air blower 4 in the outer box 1
And a drive motor 5 of the blower 4 is attached to the upper plate 3. Further, a ground wire 6 which is pre-wired on the back of the ceiling penetrates the upper plate 3 of the outer box 1 and is drawn into the outer box 1. In this case, since the side frame 2 and the upper plate 3 of the outer box 1 are made of colored steel plates, as shown in FIG. 8, coating films 2b and 3b are applied to the respective surfaces, and therefore, The caulked portions of both flange portions 2a and 3a are electrically insulated by these coating films 2b and 3b, and even if the ground wire 6 is screwed and connected to the side frame 2, the upper plate 3
Will not be grounded. Therefore, conventionally, the configuration is as follows. That is, most of the inside of the outer box 1 is occupied by the blower 4, but the four corners are so-called dead spaces to form surplus spaces. A steel plate earth mounting plate 7 is attached to one corner of the outer box 1, and an engaging protrusion 7a is formed on the upper end thereof.
On the other hand, an engaging hole 3c is formed in the upper plate 3, and the engaging protrusion 7a is inserted and engaged with the engaging hole 3c. The ground wire 6 is connected and fixed to the lower plate portion of the ground mounting plate 7 with a screw 8. Therefore, as shown in FIG. 10, the side end portion of the engaging projection 7a of the earth mounting plate 7 is electrically connected to the side edge of the engaging hole 3c of the upper plate 3, and thus the upper plate 3 Will be grounded.

(Problems to be Solved by the Invention) In the conventional configuration, since the ground mounting plate 7 is required,
As a result, the number of parts increases, the mounting work becomes troublesome, which causes a cost increase, and it is necessary to additionally form the engaging hole 3c in the upper plate 3 of the outer box 1. Airtightness is impaired.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a duct ventilation fan that does not need to be provided with a ground mounting plate even if the outer box made of a colored steel plate is used.

[Structure of the Invention] (Means for Solving the Problems) A duct ventilation fan according to the present invention is composed of a side frame and an upper plate made of color steel plates, respectively, and is formed at a peripheral portion of an upper opening of the side frame. An outer box formed by fitting a flange portion and a flange portion formed on the peripheral portion of the upper plate, and connecting the fitted portion by caulking, and the upper plate disposed in the outer box. A blower having a supported drive motor, wherein the ground wire penetrates the upper plate and is drawn into the outer box and then screwed to the side frame, and the flange portion of the side frame is provided. Also, at least one of the flange portions of the upper plate is provided with a claw portion for peeling the coating film of the crimped portion at the time of crimping the both flange portions.

(Operation) According to the duct ventilation fan of the present invention, the claw portion is formed on at least one of the flange portions of the side frame and the upper plate of the outer casing made of the color steel plate, and when the both flange portions are caulked, the claw portion is formed. Since the coating film of the caulked portion is peeled off by the part, both flange parts, that is, the side frame and the upper plate are in an electrically conductive state, and therefore the ground wire is screwed and connected to the side frame. The upper plate can be grounded through the frame, which eliminates the need for a conventional ground mounting plate.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

First, the overall configuration will be described with reference to FIG. Ten
Is an outer box, which is composed of a side frame 11 and an upper plate 12 made of colored steel plates, respectively. The side frame 11 has a rectangular shape with upper and lower surfaces opened, a flange portion 13 projecting outward is formed in the lower surface opening portion, a flange portion 14 is formed in the peripheral portion of the upper surface opening portion, and the peripheral wall is formed. The exhaust port 15 is formed.
The upper plate 12 has a rectangular shape, a flange portion 16 is formed on the peripheral portion thereof, and a hole portion 17 (see FIG. 5) is formed at one of the four corner portions. Then, the side frame 11 and the upper plate 12 are joined by fitting both flange portions 14 and 16 and caulking the fitted portions, as described later. Reference numeral 18 denotes a blower disposed in the outer case 10, which includes a casing 19 having an intake port 19a on a lower surface thereof and a drive motor 2 in which a mounting leg 20a is mounted and supported on an upper plate 12 of the outer case 10.
0, and a fan 21 attached to the rotary shaft 20b of the drive motor 20 so as to face the intake port 19a of the casing 19. The outer box 10 having the blower 18 built therein is provided with a mounting opening 23 formed in the ceiling of the building, that is, the ceiling plate 22.
It is adapted to be inserted into the ceiling space 24 from below via, and the flange portion 13 thereof is screwed and fixed to the field edge 25.
Numeral 26 is a ground wire which is pre-wired on the ceiling 24, and as shown in FIG. 5, it penetrates the bushing 27 attached to the hole 17 of the upper plate 12 of the outer box 10 in an airtight manner. It is retracted inside the outer box 11. A crimp terminal 26a is attached to the core wire at the tip of the ground wire 26.
Is attached by a screw 29 to a ground attachment portion 28 formed by bulging inward at the lower portion of the peripheral wall of the side frame 11 in the outer box 10. Incidentally, 30 is an exhaust port body attached to the peripheral wall of the side frame 11 of the outer box 10 corresponding to the exhaust port 15, 31 is an exhaust duct fitted in the exhaust port body 30, and 32 is the lower surface of the outer box 10. It is a makeup cover arranged so as to cover the opening.

Now, according to FIGS. 1 to 3, side frames in the outer box 10
The connection structure between 11 and the upper plate 12 will be described. That is, the side frame 11
Is made of a color steel plate formed by coating the surface of a steel plate 33 with a coating film 34, and the flange portion 14 thereof is oriented substantially horizontally inward and then in a substantially V-shape oriented obliquely upward outward. Has been formed. Further, the upper plate 12 is made of a color steel plate formed by applying a coating film 36 to the surface of the steel plate 35, and the flange portion 16 thereof is directed inward and obliquely downward.
One or a plurality of triangular claw portions 37 are formed on the flange portion 16 by cutting and raising downward (see FIG. 3).

Thus, the flange portion 14 of the side frame 11 and the flange portion of the upper plate 12
In the case of connecting with the flange 16, first, as shown in FIG. 1 (a), the flange portion 16 of the upper plate 12 is placed in the flange portion 14 of the side frame 11.
Is inserted from the outside and fitted, and the fitting portions of both flange portions 14 and 16 are caulked from above and below. Thereby, the first
As shown in FIG. 3B, the sharpened tip portion 37 a of the claw portion 37 contacts the horizontal portion of the flange portion 14. In this state, when the caulking process of the fitting portions of the flange portions 14 and 16 is further advanced, as shown in FIG. 1C, the tip portion 37a of the claw portion 37 is formed.
Peels off the coating film 34 on the upper surface of the horizontal portion of the flange portion 14 by scraping it off.
The coating film 36 on the lower surface of 37a is also peeled off. After that, when the caulking process of the fitting portions of the both flange portions 14 and 16 is completed, the both flange portions 14 and 16 are joined so as to sandwich and press each other, as shown in FIG. 1 (d). When the caulking of both flanges 14 and 16 is completed in this way, a film exfoliation part 14a is formed in the caulking part where the paint film 34 is exfoliated on the flange 14 as shown in FIG. At the same time, the coating film peeling portion 37b in which the coating film 36 is peeled off is formed on the claw portion 37, and the tip portion 37a of the claw portion 37 comes to bite into the film peeling portion 14a, whereby the side frame 11 The steel plate 33 and the steel plate 35 of the upper plate 12 are electrically connected. This allows
As shown in FIG. 5, attach the crimp terminal 26a of the ground wire 26 to the side frame 1
When it is attached and fixed to the ground attachment part 28 of 1 with the screw 29,
Since the screw 29 is electrically connected to the steel plate 33 of the side frame 11, the ground wire 26 and the steel plate 33 of the side frame 11 are electrically connected, and as described above, the steel plate 33 of the side frame 11 is made. Upper plate 12
Since the flanges 14 and 16 are electrically connected to the steel plate 35, the upper plate 12 can be grounded.

According to this embodiment, the following effects can be obtained. That is, when the fitting portion between the flange portion 14 of the side frame 11 and the flange portion 16 of the upper plate 12 is caulked, the film peeling portion 14a is formed on the flange portion 14 by the claw portion 37 formed on the flange portion 16. With the nail portion 37, the film peeling portion 37b
Is formed, and the tip portion 37a of the claw portion 37 is made to bite into the film peeling portion 14a. As a result, the steel plates 33 and 35 of the side frame 11 and the upper plate 12 made of color steel plates can be electrically connected. Therefore, the crimp terminal 26a of the ground wire 26 is screwed to the ground attachment portion 28 of the side frame 11 with the screw 29.
The grounding of the upper plate 12 can be reliably achieved by simply connecting and fixing with, and it is not necessary to use the grounding mounting plate 7 as in the conventional case, and the number of parts can be reduced accordingly, and the mounting work of the grounding mounting plate 7 can be performed. Also becomes unnecessary and the cost can be reduced. Moreover, since it is only necessary to pull the ground wire 26 into the outer box 10 through the bushing 27 attached to the hole 17 of the upper plate 12, the locking hole 3c is formed in the upper plate 3 as in the conventional case.
Therefore, the airtightness inside the outer box 10 can be sufficiently ensured.

In the above embodiment, the claw portion 37 is formed on the flange portion 16 of the upper plate 12, but conversely, the claw portion similar to the claw portion 17 is formed on the flange portion 14 of the side frame 11. Or, the claws may be formed on both the flanges 14 and 16, and the point is that the claws may be formed on at least one of the flanges 14 and 16.

Besides, the present invention is not limited to the embodiments described above and shown in the drawings, and it is needless to say that the present invention can be appropriately modified and implemented without departing from the scope of the invention.

[Advantages of the Invention] As described above, the duct ventilation fan of the present invention is formed on at least one of both flange portions when caulking both flange portions of a side frame and an upper plate made of a color steel plate forming an outer box. Since the coating film of the caulked portion is peeled off by the claws that have been formed, the upper plate can be grounded by simply screwing the ground wire drawn into the outer box to the side frame. It is not necessary to use such a ground mounting plate, the number of parts is reduced accordingly, the mounting work is simplified, the cost can be reduced, and an extra engaging hole is formed in the upper plate. No need to
It has an excellent effect that the airtightness of the outer box can be maintained.

[Brief description of drawings]

FIGS. 1 to 5 show an embodiment of the present invention, and FIGS. 1 (a) to (d) show a main part for explaining a connecting process of both flange portions of a side frame and an upper plate. Sectional view, Figure 2 shows first
FIG. 3D is an enlarged cross-sectional view of the main part in FIG. 3D, FIG. 3 is a partially enlarged perspective view of the flange portion of the upper plate, and FIG.
FIG. 5 is a sectional view of a corner portion of the outer box, and FIGS. 6 to 10 show a conventional example, FIG. 6 is a bottom view, and FIG. 7 is along line VII-VII of FIG. Sectional view, FIG. 8 is an enlarged sectional view of the caulking portion of the side frame and both flanges of the upper plate, FIG. 9 is a perspective view of the ground mounting plate, and FIG. 10 is engagement between the upper plate and the ground mounting plate. It is sectional drawing which shows a state. In the drawings, 10 is an outer box, 11 is a side frame, 12 is an upper plate, 14 and 16 are flanges, 18 is a blower, 17 is a hole, 19 is a casing,
20 is a drive motor, 21 is a fan, 26 is a ground wire, 27 is a bushing, 28 is a ground attachment part, 29 is a screw, 31 is an exhaust duct, 33 and 35 are steel plates, 34 and 36 are paint films, 37 is a claw part Indicates.

Claims (1)

(57) [Claims] 1. A flange portion formed on a peripheral portion of an upper surface opening of a side frame and a flange portion formed on a peripheral portion of an upper plate, each of which is composed of a side frame and an upper plate made of color steel plates. An outer box formed by combining the fitting parts by caulking the fitting part and a blower having a drive motor arranged in the outer box and supported by the upper plate; It is penetrated through the upper plate and drawn into the outer box and then screwed to the side frame, and at least one of the flange part of the side frame and the flange part of the upper plate is caulked on both flange parts. A ventilation fan for ducts, characterized in that a claw portion for peeling off the coating film of the caulked portion is formed at times.