JP3202905B2 - Ceiling ventilation fan - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling fan with improved safety in using electric components.

[0002]

2. Description of the Related Art Conventionally, in a ceiling fan, FIG.
As shown in FIG.
Electrical components such as a capacitor 5 and quick-connecting terminals (which are chucked and connected and held by simply inserting lead wires, also referred to as SL terminals) 6 are mounted on the mounting plate 2 with screws 7 and 8.

[0003]

Among the above-mentioned electric components, the capacitor 5 has a possibility of burning, though rare, when it is overheated. When the electric components burn in this manner, the influence may be exerted on the main body frame 1.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and therefore has as its object to eliminate the influence on the body frame when an electric component is burned even if it is burned. It is an object of the present invention to provide a highly safe ceiling ventilation fan which can be used without fear of electric shock.

[0005]

In order to achieve the above object, a ceiling ventilation fan according to the present invention comprises a plastic body frame, and a metal case having an open lower surface inside the body frame. It is mounted so as to be electrically connected to the motor of the blower, and in this case, a plastic box containing necessary electric parts is stored, and a ground wire is connected.

According to the above means, the electric component is covered by the metal case, and the influence on the body frame when the electric component is burned is cut off by the metal case.
Also, even if you say that you want to store electrical components in a metal case,
It is through a plastic box and the electrical leakage from the electrical components to the metal case is cut off by the plastic box. Furthermore, the metal case is electrically connected to the motor of the blower, and the ground wire is connected to the metal case, so that the motor can be grounded through the metal case, further reducing the risk of electric shock. obtain.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below.
This will be described with reference to FIGS. First, FIG. 1 shows an overall configuration of a ceiling ventilation fan, in which a wooden frame 12 attached to a ceiling 11 of a house, a main body frame 13 and a plurality of screws 14.
(Only one is shown). This body frame 1
Numeral 3 is made of plastic, and integrally has a casing 15 therein and a motor housing 16 at the top similarly. The motor housing 16 has a motor 18 of a blower 17.
In this state, the motor 18 is
A plurality of screws 20 (only one is shown) are mounted on a metal mounting plate 19 disposed on the upper surface of the main body frame 13 with the upper wall interposed therebetween. In addition, the blower 1 is
7 are housed, and the fan 21
8 (not shown).

FIG. 2 shows the casing 1 at the corner of the main body frame 13.
5 shows a space 22 formed between the outer peripheral surface of the main frame 5 and a code bushing 23 mounted on an upper portion of the main body frame 13 and formed with a boss portion 24 shown in FIG. are doing. Also, the rib 25 and the rib 26 shown in FIG.
And a boss 28 having a rib 27 is formed. On the other hand, a rib 29 is formed on the casing 15. These ribs 25 to 27, 29
4 are arranged at four points corresponding to the respective corners of a vertically long rectangle in FIG.

In the space 22, the rectangular box-shaped metal case 30 is accommodated by being guided by the above-mentioned ribs 25 to 27, 29. Therefore, the ribs 25 to 27, 29 accommodate the case 30. It functions as a storage unit. In addition, a mounting hole 31 shown in FIG.
The case 30 is mounted on the mounting plate 19 by inserting a screw 32 through the mounting hole 31 through the wave washer 33 and further inserting the inserted screw 32 through the boss portion 24 into the mounting plate 19. 30 to wave washer 33
The motor 18 is electrically connected to the motor 18 via the screw 32 and the mounting plate 19.

Here, FIG. 3 shows a blank shape of the case 30, which has a substantially bell shape. This case 3
The blank 30 is bent into a mountain fold from a fold line 34 indicated by a two-dot chain line, and the case 30 is formed into a rectangular box shape shown in FIG. . The upper and lower edges of the right side portion 30a of the blank of the case 30 have a width A from the fold 34, and the left side portion 30b
The upper and lower edges have the fold 34 outside the fold 34 of the right side portion 30a by the thickness t, the width from the fold 34 is B, and the total dimension of both widths A and B (A + B) The both sides 30
The width of the central portion 30c between the a and 30b (the upper portion in the bent state) 30c is set to be larger than the width C, so that in the bent state, one end of the case 30 and the other side facing the end of the case 30 have the ends of the blank. The edges (upper and lower edges of the right portion 30a and upper and lower edges of the left portion 30b) overlap each other by a dimension D.

In addition, an elastic piece 36 is formed in the case 30 by two cut portions 35 at the tip of the left side portion 30b from the time of blanking, and the elastic piece 36 has a hole 37 functioning as a concave portion. Has formed. Furthermore, case 30
A ground terminal connecting piece 38 is integrally extended at the tip of the left side portion 30b, and is bent substantially horizontally. A cutout 39 for lead-out is provided in the right side 30a of the case 30.
Is formed. With respect to the case 30 thus formed, the ribs 25 to 27, 2
The storage section 9 controls the opening of the overlapping portion of the case 30.

FIG. 5 shows a box 40 housed in the case 30. The box 40 is made of plastic and includes a main body portion 40a having a rectangular box shape slightly smaller than the case 30 and a lid portion 40b formed integrally with one side portion of the open lower surface portion by a self-hinge portion 41. A claw portion 42 corresponding to the hole 37 of the case 30 and a cutout portion 43 for leading out a lead wire are formed below the main body portion 40a, and a projection 44 located in the main body portion 40a is formed on the lid portion 40b. And the projections 44
A non-combustible plate 45 such as mica is mounted around the periphery, and a fixing hole 47 is formed at the tip of the extension portion 46.

In this configuration, the box 40 has a main body 40
The capacitor 48 and the quick connection terminal 49, which are the electrical components shown in FIG. 1, are housed in the opening a on the lower surface, and the lid 40b is closed. Then, the body 40 a of the box 40 is
0, the elastic piece 36 is pushed back and opened by the claw 42, and the claw 42 is engaged with the recess of the hole 37 to restore the elastic piece 36.
The main unit 40a of the box 40 is fixed to the box 0.
Thereafter, a screw 50 shown in FIG. 2 is passed through a fixing hole 47 at the tip of the extension portion 46 of the lid portion 40b, and the screw 50 is screwed into the boss portion 28 in the main body frame 13 to be fixed.

A connection terminal 52 of a ground wire 51 is attached to the ground terminal connection piece 38 of the case 30 with a screw 52, and the ground wire 51 is connected to the case 30. The ground wire 51 and the notch 43 of the box 40
And the lead wire 5 led out from the notch 39 of the case 30
3 is inserted through the protective tube 54 and led out from the cord bushing 23 to the outside of the main body frame 13.

In the case of such a structure, the capacitor 48 and the quick connection terminal 49, which are electrical components, are covered by the metal case 30, and the body frame 13 when the capacitor 48 and the quick connection terminal 49 should be burned. (For example, the spread of fire) is cut off by the metal case 30, and the effect is sufficient to prevent the influence.

The capacitor 48 and the quick connection terminal 4
9 is stored in the metal case 30 via the plastic box 40, and the leakage from the capacitor 48 and the quick connection terminal 49 to the metal case 30 is cut off by the plastic box 40. There is no danger of electric shock even if the case 30 is touched.

Further, the case 30 is electrically connected to the motor 18 of the blower 17 and the earth wire 51 is connected to the case 30, so that the motor 18 can be grounded through the case 30 to further reduce the risk of electric shock. Can be lost. Further, in this case, the ground of the motor 18 and the case 3
Since the ground of 0 can be made by using the common ground wire 51, the cost can be reduced. In addition, since the connection of the ground wire 51 can be made inside the main body frame 13 instead of outside the main body frame 13, the workability of the connection can be improved.

In addition, in particular, in the case of the above configuration, the box 40 is fixed to the case 30 by engaging the claw portion 42 provided in the box 40 with the hole 37 provided in the case 30. By simply inserting the box 40 into the case 30, the box 40 can be fixed and the workability of assembly can be improved. Also, if the claw portion 42 is pulled out of the box 30 from the case 30 while opening the elastic piece 36,
Since the engagement with the hole 37 can be released, the inspection and replacement of the capacitor 48 and the quick connection terminal 49 can be conveniently performed.

In this case, the claw portion 42 and the hole 37 may be provided in the case 30 and the hole 37 may be provided in the box 40, contrary to the above. Further, the hole 37 is essentially a concave portion, and therefore, may be formed simply by being recessed in the case 30 or the box 40.

Also, since the blank shape of the case 30 is approximately dumbbell-shaped, this is bent, and the edge is overlapped on one side of the case 30 and the other side facing the same.
The material removal is good and the number of processing steps can be reduced.
Further, the storage items (the capacitor 48, the quick connection terminal 49, and the box 40) can be reliably covered.
In addition, it is possible to more reliably prevent the influence on the main body frame 13 when the quick connection terminal 49 burns.

Moreover, the case 30 having the edge portions overlapped is stored in the storage portion of the main body frame 13 by the ribs 25 to 27 and 29, so that the opening of the overlapped portion of the case 30 is controlled. This eliminates the necessity of welding the overlapped portion and the like, thereby reducing the number of assembling steps and reducing the cost.

In this case, as the storage portion, the rib 2
For example, it may be formed by a wall surface surrounding all or most of the case 30 other than 5 to 27, 29, and the wall surface may be the inner surface of the main body frame 13 or the outer surface of the casing 15 itself. Further, the opening of the overlapping portion of the case 30 is not limited so as not to be opened at all, but may be controlled so as not to be opened more than a predetermined dimension.

In addition, in particular, in the above configuration, the wave washer 3 is attached to the screw 32 for attaching the case 30 to the main body frame 13.
3, the screw 32 is not loosened by the elastic force of the wave washer 33 even if the boss portion 24 serving as the mounting portion is deformed with time by the tightening force of the screw 32.
3 through the motor 18, the case 3
The electrical continuity to 0 can also be maintained satisfactorily. The wave washer 33 may be replaced with a spring washer.

Further, since the ground terminal connection piece 38 for connecting the connection terminal 52 of the ground wire 51 to the case 30 is formed integrally with the case 30, no separate parts are required and the cost can be further reduced. The case 30 is attached to the body frame 13 (the boss 2).
4) only comes into contact with the peripheral portion of the mounting hole 31 and the other portions are separated from the main body frame 13. Therefore, when the capacitor 48 and the quick connection terminal 49 are burned, the case 30
The heat transmitted to the main body frame 13 can be further minimized.

[0025]

The present invention is as described above.
The following effects are obtained. According to the ceiling ventilation fan of the first aspect, the influence on the main body frame when the electric component is burned can be eliminated by the metal case, and the safety can be improved. Also, the risk of electric shock from electrical parts,
This eliminates the need for a plastic box and a ground structure that passes through a metal case from the motor of the blower, thereby further improving safety. Moreover, in this case, the grounding of the motor and the grounding of the case can be performed using a common grounding wire, so that the cost can be reduced and the grounding wire can be connected not inside the mainframe but inside the mainframe. Workability can also be improved.

According to the ceiling ventilation fan of the second aspect, the box can be fixed by simply inserting the box into the case, and the workability of assembly can be improved. Further, since the fixing can be released, it is convenient for checking and replacing the electric parts.

According to the third aspect of the present invention, the material for the blank of the case can be easily removed, and the number of steps can be easily reduced. In addition, it is possible to reliably cover the storage components such as the electric component and the box, and it is possible to more reliably prevent the influence on the main body frame when the electric component is burned. In addition, no special member is required to suppress the opening of the case from the overlapping portion, so that the number of assembling steps can be further reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main portion showing an embodiment of the present invention.

FIG. 2 is a bottom view of a main part.

FIG. 3 is a plan view showing a blank shape of a case.

FIG. 4 is a perspective view of a case alone.

FIG. 5 is an exploded perspective view of a case and a box.

FIG. 6 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

13 is a body frame, 17 is a blower, 18 is a motor, 19 is a mounting plate, 25 to 27 and 29 are ribs (storage portions), 30 is a case, 34 is a fold, D is an overlapping dimension, and 37 is a hole (recess). ,
Reference numeral 40 denotes a box, 42 denotes a claw portion, 48 denotes a capacitor (electric component), 49 denotes a quick connection terminal (electric component), and 51 denotes a ground wire.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24F 7/10 101 H02H 7/00

Claims (3)

(57) [Claims] 1. A main body frame made of plastic, and a metal case having an open lower surface is mounted inside the main body frame so as to be electrically connected to a motor of a blower. A ventilation fan for ceilings, which houses a plastic box that houses a box and a ground wire. 2. The ceiling ventilation fan according to claim 1, wherein the box is fixed to the case by engagement of a claw provided on one side thereof with a recess provided on the other side. 3. A blank shape of a case is a dumbbell shape,
The main body frame is bent so that the edge is overlapped on one side of the case and the other side facing the case, and the case is stored so as to limit the expansion of the overlapped portion. The ceiling ventilation fan according to claim 1, wherein: