JPH08319988A - Ventilation fan - Google Patents

Abstract

PURPOSE: To improve the strength of a protection guard without increasing a cost. CONSTITUTION: A ventilation fan is formed in such a manner that an electric motor 3 rotating an impeller 4 is fixed on the central line of a duct part 2 by a plurality of mounting legs 5 disposed in such a manner to peripherally divide a duct part 2 formed at the central part of an outer frame 1 and the electric motor 3 side of the duct part 2 is covered by a cup-form protection guard 8 formed by using a wire rod attached to the mounting legs 5. A plurality of release parts 12 to escape the base sides of the respective mounting legs 5 are formed in the outer peripheral part of the protrusion guard 8. This constitution peripherally interconnects the release parts 12 by coupling members 14 positioned astride the respective base part sides of the mounting legs 5 entering the respective release parts 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relatively large exhaust fan having a protective guard.

[0002]

2. Description of the Related Art Most of the above-mentioned ventilation fans are for business use,
Basically, an impeller that is rotated by an electric motor that forms an air flow in the axial direction is incorporated in a duct portion formed in the center of an outer frame that is a mounting frame for a wall surface or the like. The electric motor for rotating the impeller has one end fixed to the outer frame, and the other end fixed on the center line of the duct portion by a plurality of mounting legs extending toward the duct portion. Some of these ventilation fans are provided with a protective guard 101 formed into a cup shape with a steel wire or a stainless wire as shown in FIG.

The protective guard 101 covers the duct side on the electric motor side and is attached to the mounting feet with screws or the like, but the outermost peripheral portion is mounted so as not to obstruct the overall compactness and mounting. Designed to be inside the base of the foot. Therefore, as shown in FIG. 9, the outermost peripheral portion of the protective guard 101 is provided with an opening portion 102 for avoiding interference with the base portion of each mounting foot. These open parts 102 form the outermost peripheral part of the outer peripheral ring 1.
03 and a part of the inner ring thereof are cut off, and the decrease in rigidity due to this is arranged radially on the inner side of each open portion 102 to connect the outer ring 103 and the inner ring. The vertical lines 104 are supplemented by connecting the reinforcing lines 105 by welding.

[0004]

In the conventional ventilation fan having the protection guard 101 as described above, since the protection guard 101 has the open portion 102, it is easily distorted and the shape of the protection guard 101 is easily deformed. In addition, it is often operated to obtain the ventilation air volume according to the place of use by driving with an inverter etc.
Depending on the driving condition, vibration noise or resonance noise is generated in the open portion 102 of the protective guard 101, which raises a problem that driving noise becomes high.

In order to overcome these problems, the wire diameter of the outer peripheral ring 103 forming the outermost periphery of the protective guard 101 is increased, or the outer peripheral ring 1 is made of a material having a rectangular cross section.
No. 03 has been made, or an attempt has been made to increase the overall diameter of the protective guard 101, but in any of these cases, a new material cost rise and a rise in cost due to changes in manufacturing equipment have occurred. It includes problems.

The present invention has been made in order to solve the above-mentioned conventional problems. The object of the present invention is to improve the strength of the protective guard without increasing the cost.
The purpose of the invention is to obtain a ventilation fan in which the protective guard hardly vibrates or makes noise, and the strength of the protective guard is improved as easily as possible.

[0007]

In order to achieve the above object, the invention of claim 1 is such that a plurality of mounting feet are arranged so as to circumferentially divide a duct portion formed at the center of an outer frame. An electric motor that rotates the impeller is fixed on the center line of the duct part by the, and the ventilation fan covered with a cup-shaped protective guard made of wire attached to the mounting foot on the electric side of the duct part is attached to the outer periphery of the protective guard. , Adopting a means to connect in the circumferential direction with a connecting member that straddles the base side of each mounting foot that allows these opening parts to enter each open portion To do.

In order to achieve the above object, the invention of claim 2 is characterized in that the connecting member of the protective guard in the means according to claim 1 has an outer periphery of the protective guard so as to straddle each open portion of the outer periphery of the protective guard from the outside. Adopt a means of fixing to the part.

In order to achieve the above-mentioned object, the invention of claim 3 is such that the connecting member of the protective guard in the means according to claim 1 straddles each open part of the outer peripheral part of the protective guard, and the outer peripheral part of the protective guard. Adopting a means that can be removably attached to the.

In order to achieve the above object, the invention of claim 4 urges the connecting member of the protective guard in the means according to claim 3 in a direction in which the opening portion of the protective guard is reduced in the circumferential direction in the mounted state. Means for providing elastic force are adopted.

[0011]

In the above means, the outer periphery of the protective guard is opened by the plurality of open portions, so that the interference with each mounting leg is avoided by the open portions. The opening increases the freedom of movement of the outer periphery of the protective guard in the radial direction, but each opening is connected in the circumferential direction by a connecting member that straddles the base side of each mounting foot that is inserted into each opening. Since the outer peripheral portion constitutes a ring, its radial displacement is restricted.

According to a second aspect of the present invention, there is provided the first aspect.
In addition to this action, the outer peripheral portion of the protective guard is integrated as a series of rings by a connecting member.

According to a third aspect of the present invention, there is provided the first aspect.
With this action, the connecting member can be mounted later so as to straddle each open portion of the outer peripheral portion of the protective guard.

According to a fourth aspect of the present invention, there is provided the third aspect of the present invention.
In addition to the above action, each open portion in the outer peripheral portion of the protective guard is urged by the elastic force of the connecting member in the direction of contracting in the circumferential direction.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. Example 1. FIG. 1 is a front view showing a ventilation fan according to an embodiment of the present invention, and FIG. 2 is a side view showing a part of the ventilation fan similarly cut away. This ventilation fan has an outer frame 1 with a square planar shape.
It is a relatively large type that is attached to a wall surface or the like by means of air supply or exhaust to ventilate the room. At the center of the outer frame 1 is integrally provided a duct part 2 forming an air passage formed in a bell mouth part whose one end is expanded into an arc.
An impeller 4 which is rotated by an electric motor 3 and forms an axial airflow in the duct portion 2 is incorporated in the duct portion 2.

A plurality of electric motors 3 for rotating the impeller 4 are fixed at one end with screws at positions corresponding to the corners on the front surface of the outer frame 1 and have other ends extending toward the center of the duct portion 2. It is supported by book mounting feet 5. The mounting foot 5 is
Four (sometimes three) are provided at equal intervals, the base side of which is screwed to the outer frame 1 projects forward along the duct part 2, and the side supporting the electric motor 3 faces the duct part 2. And extend radially (see FIG. 2). The ends of the mounting legs 5 on the duct portion 2 side are connected to each other by a connecting member, and the electric motor mounting plate 6 is fixed to the center of them. The electric motor 3 is fitted into a mounting hole formed in the center of the electric motor mounting plate 6, and is screwed to the electric motor mounting plate 6 and fixed on the center line of the duct portion 2.

The electric motor 3 side of the duct portion 2 is covered with a cup-shaped protective guard 8 which is detachably attached to each of the mounting feet 5 together with one side of the electric motor 3 by means of a mounting bracket 7. As shown in FIGS. 3 and 4, the protective guard 8 has a cage shape in which an outer peripheral ring 9 forming the outermost peripheral portion and several inner peripheral rings 10 are concentrically connected by a large number of radial vertical lines 11. The cup is made of wire material such as steel wire or stainless wire. Outer ring 9 and each inner ring 10 and each vertical line 1
The intersection with 1 is joined by welding or the like. The inner side of the innermost ring 10 at the innermost side corresponds to one side end of the electric motor 3 and a vertical line 1
1 is not provided and is open as it is.

On the outer peripheral portion of the protective guard 8, there are formed open portions 12 corresponding to the intervals and the number of the mounting feet 5 for avoiding interference with the base side of each mounting foot 5. Each of these open portions 12 is formed by cutting the outer peripheral ring 9 and the inner peripheral ring 10 closest to the outer peripheral ring 9 at intervals of vertical lines 11. Several reinforcing wires 13 (two in the drawing) are provided on the inner side of each open portion 12 along the vertical line 11 of the corresponding portion.
It is laid across and fixed. By providing the protective guard 8 with the opening 12 as described above, the diameter of the protective guard 8 can be reduced and the overall structure can be made compact, but the degree of freedom of movement of the outer peripheral portion of the protective guard 8 in the radial direction increases, The shape of the protective guard 8 is easily distorted, and depending on the operating state, the outer peripheral portion vibrates due to insufficient strength due to the open portion 12 of the protective guard 8, and vibrating noise or resonance noise is generated.

Therefore, in the ventilation fan according to the first embodiment, the outermost outer peripheral ring 9 is provided with the connecting member 14 that straddles the base side of each mounting foot 5 that enters each open portion 12 of the protective guard 8 from the outside.
The joints are connected in the circumferential direction by welding or the like so as to connect the open portions of the. As a result, the interference with each mounting foot 5 can be avoided by the open portion 12, the strength of the outer peripheral portion of the protective guard 8 is increased, and its radial distortion and deformation are restricted, so that almost no vibration noise or resonance noise is generated. Disappear. Further, it is not necessary to increase the wire diameter of the outer peripheral ring 9 forming the outermost periphery of the protective guard 8 or to form the outer peripheral ring 9 with a material having a rectangular cross-sectional shape, and simply connect the connecting members 14. Therefore, the material cost does not rise and the manufacturing equipment is not changed.

The protection guard 8 is attached in the same manner as the conventional one as shown in FIG. That is, hook the hook at the tip of the threaded rod 15 inserted through the mounting bracket 7 on the mounting foot 5,
It is performed by screwing a wing nut 16 onto the screw rod 15 from the outside and tightening. By tightening the wing nut 16, the protective guard 8 is fixed at the position where the reinforcing wire 13 provided in the open portion 12 hits each mounting foot 5.

Example 2. In the second embodiment, the connecting member 14 for the protection guard 8 of the ventilation fan of the above-described first embodiment is configured to be detachable, and the connecting member 14 has an elastic force. Other configurations except the connecting member 14 Is the same as that of the first embodiment. Therefore, regarding the configuration other than the connecting member 14, the description thereof will be referred to together with the drawings of the first embodiment, and the description thereof will be omitted.

The main body of the protective guard 8 of the second embodiment is the same as that of the conventional example shown in FIG. That is, Example 1
This is a configuration in which the connecting member 14 of the protective guard 8 of FIG.
The open portions 12 are connected to the protective guard 8 by hooking and attaching a loop-shaped connecting member 14 made of a spring material as shown in FIG. 5 to each open portion 12. .

The loop portion 17 of the connecting member 14 is constructed so that the mounting foot 5 can be inserted therethrough, and hooks 18 which are hooked from the outside to the vertical lines 11 on both sides of the open portion 12 are provided at the free ends of both ends of the loop portion 17. Are formed respectively. Each hook 1
In the free state, the interval of 8 is set to be smaller than the length of the cut portion of the outermost peripheral ring 9. By attaching the connecting member 14 to each of the open portions 12 of the main body of the protective guard 8 attached to the mounting foot 5 as shown in FIG. 6, the protective guard 8 shown in the first embodiment can be obtained. It will perform the same function.

That is, after the corresponding mounting foot 5 is inserted into the loop portion 17 of each connecting member 14 by utilizing elastic deformation, the opening portion 12 is opened while widening the interval of each hook 18 against the elastic force. Hooks 18 are hooked from the outside to the vertical lines 11 on both sides of. As a result, the open portion 12 is urged and connected in the circumferential direction in a direction in which it is contracted by the elastic force of the connecting member 14, and the low strength of the outer peripheral portion due to the open portion 12 of the protective guard 8 is eliminated. It is possible to perform the same function as the protection guard 8 of the first embodiment with a simple structure. In the second embodiment, the protection guard 8 of the related art can be easily constructed as the protection guard 8 which is stable in strength only by preparing the connecting member 14 having the elastic force. The other configurations and functions are the same as those of the first embodiment, and thus the description thereof will be omitted.

Even if the connecting member 14 can be engaged and disengaged and the elastic force for reducing the opening portion 12 is not particularly provided, the strength of the outer peripheral portion can be increased to some extent, but in the case where it is also removable, The effect is more remarkable when the elastic force as described above is given.

Example 3. In the third embodiment, the connecting member 14 of the second embodiment described above is formed in a V-shape or a U-shape without the loop portion 17 as shown in FIG. The other configuration is the same as that of the second embodiment. That is, it is not necessary to insert the attachment foot 5 into the loop portion 17, and the attachment foot 5 can be attached to the opening portion 12 by a simple operation of hooking the hooks 18 at both ends. The other configurations and functions are the same as those of the second embodiment, and thus the description thereof will be omitted.

Example 4. In this fourth embodiment, as shown in FIG.
It is composed of 9. If the hooks 18 formed at both ends of the coil spring 19 are hooked and attached to the open portion 12, the same effect as that of the second embodiment can be obtained. In this case, the coil spring 19 may be turned outside or inside the mounting foot 5.

[0028]

As is clear from the above description of the embodiments, according to the invention of claim 1, it is possible to improve the strength of the outer peripheral portion of the protective guard without increasing the cost, and the protective guard vibrates. It is possible to obtain a ventilation fan that causes almost no noise or noise.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, since the outer peripheral portion of the protective guard is integrated as a series of rings by the connecting member, the strength of the outer peripheral portion of the protective guard is further improved. be able to.

According to the invention of claim 3, in addition to the effect of the invention of claim 1, the connecting member can be mounted later so as to straddle each open portion of the outer peripheral portion of the protective guard, and the strength of the protective guard can be increased. Can be easily and easily achieved.

According to the invention of claim 4, in addition to the effect of the invention of claim 3, the strength of the outer peripheral portion of the protective guard can be improved by the elastic force of the connecting member, and the structure is simplified.

[Brief description of drawings]

FIG. 1 is a front view showing a ventilation fan as an embodiment of the present invention.

FIG. 2 is a side view showing a ventilation fan as an embodiment of the present invention with a part thereof cut away.

FIG. 3 is a front view showing a protection guard of the ventilation fan of the first embodiment.

FIG. 4 is a side view showing the protection guard of the ventilation fan of the first embodiment.

FIG. 5 is a plan view showing a connecting member according to a second embodiment.

FIG. 6 is an enlarged plan view of the main part of the protection guard of the ventilation fan of the second embodiment.

FIG. 7 is a plan view showing a connecting member according to a third embodiment.

FIG. 8 is a plan view showing a connecting member according to a fourth embodiment.

FIG. 9 is a front view showing a conventional guard of a ventilation fan.

[Explanation of symbols]

 1 Outer frame 2 Duct part 3 Electric motor 4 Impeller 5 Mounting foot 8 Protective guard 9 Outer ring 12 Open part 14 Connecting member 17 Loop part 18 Hook 19 Coil spring

Claims (4)

[Claims] 1. An outer frame has an impeller that rotates in a duct formed in the center of an outer frame and forms an axial air flow in the duct, and an electric motor that rotates the impeller is provided in the outer frame. One end is fixed, the other end extends toward the duct portion, and is fixed on the center line of the duct portion by a plurality of mounting feet arranged so as to divide the duct portion in the circumferential direction. A ventilation fan in which the electric motor side of the portion is covered by a cup-shaped protective guard made of a wire attached to the mounting foot, and a plurality of ventilating fans for escaping the base side of the mounting feet to the outer peripheral portion of the protective guard. The ventilating fan is characterized in that the opening parts are provided and are connected in the circumferential direction by a connecting member that straddles the base side of each mounting foot that allows the opening parts to enter the opening parts. 2. The ventilation fan according to claim 1, wherein the connecting member of the protective guard is fixed to the outer peripheral portion of the protective guard so as to straddle each open portion of the outer peripheral portion of the protective guard from the outside. Ventilation fan characterized by. 3. The ventilation fan according to claim 1, wherein the connecting member of the protective guard is detachably attached to the outer peripheral portion of the protective guard so as to straddle each open portion of the outer peripheral portion of the protective guard. A ventilation fan characterized by that. 4. The ventilation fan according to claim 3, wherein the connecting member has an elastic force for urging the opening portion of the protection guard in a circumferential direction to reduce the opening portion in a mounted state. Exhaust fan.