JP2005240697A - Fan filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fan filter facilitating removal and installation, shortening the time for the work thereof, allowing replacement of only the part where a filter material is damaged or dirty, and providing a high yield in cutting the filter material. <P>SOLUTION: Since the filter material 16 is divided into two parts, filter materials 16A, 16B, which are stretched over parted frames 17A, 17B respectively, the filter materials can be removed and installed easily, shortening the time for the work. Furthermore, if the filter material 16 is partially damaged or dirty, only the faulty partial filter material 16A or 16B can be replaced along with one of the parted frames 17A and 17B. Accordingly, the time for replacing the filter material 16 is shortened and the cost for replacement is reduced. In addition, since the filter material 16 is fan-shaped, the yield in cutting is increased. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric fan filter, and more particularly to an electric fan filter that is attached to and detached from a back surface portion of a blade guard that covers a rotating blade of an electric fan.

In recent years, by covering the back part of the blade guard that covers the rotating blades of the fan from the outside and using this fan while maintaining this state, fine dust and dust floating in the indoor air are filtered. Fan filters have been developed.
As a conventional fan filter, for example, a filter of Patent Document 1 is known.
The filter of patent document 1 has a donut shape in the unfolded state, and is a filter material capable of covering the back part of the blade guard fixed to the motor part of the electric fan, and a telescopically sewn to the outer edge part of the filter material A flat rubber string, and a planar fastener that locks both ends formed by cutting one slit from the center of curvature of the filter material toward the outside in the radial direction.

When using this filter, the back surface of the blade guard is first covered with a filter material. That is, the outer edge side of the filter material is aligned with the maximum diameter portion of the blade guard, that is, the connection portion between the front surface portion and the back surface portion of the blade guard, and the inner edge portion side of the filter material is connected to the motor portion of the blade guard. The filter material is wound around the blade guard along Then, this winding state is maintained by latching the both ends of a filter material with a planar fastener.
When the rotating blade is rotated by the motor unit, the indoor air is sucked into the inner space of the blade guard from the back surface portion of the blade guard and then blown out to the front of the electric fan through the front surface portion of the blade guard. At this time, fine dust and dust floating in the indoor air are filtered by the filter material.
JP-A-11-159499

However, the fan filter disclosed in Patent Document 1 has the following problems.
(1) The filter material had a substantially donut shape in the unfolded state. For this reason, when the back surface portion of the blade guard is covered with the filter material, it is necessary to collectively latch the filter material over the entire back surface portion. As a result, the attachment and detachment of the filter material was cumbersome and took a long time, and the attachment and detachment had to be repeated many times before getting used.
(2) Further, since the filter material is a single sheet, when a part of the filter material is damaged or soiled for some reason, it is necessary to replace the entire filter material with a new one.

(3) Furthermore, since the filter material was a single sheet having a substantially donut shape, a large filter cloth was required to cut the filter material. For this reason, the raw material cost increases and the cutting edge increases, and the yield of the filter material obtained from the filter cloth per unit area is reduced.
(4) The inner edge portion of the conventional filter material was simply cut at the time of cutting. For this reason, it is difficult to seal the connecting portion between the blade guard and the motor portion without gaps by the inner edge portion of the filter material. As a result, room air from which dust or dust has not been filtered has been sucked into the internal space of the blade guard from the gap between the inner edge of the filter material and the base of the blade guard.

Therefore, the present invention makes it easy to attach and detach the filter material, and can shorten the work time, and only a part of the filter material is removed in response to partial breakage or partial contamination of the filter material. Another object of the present invention is to provide a fan filter that can be replaced and that has a high yield when the filter material is cut.
Another object of the present invention is to provide a fan filter capable of hooking a partial frame to the back surface without any problem even if the actual size in the circumferential direction of the back surface is slightly different from the set size.
Furthermore, an object of the present invention is to provide a fan filter in which the engaged partial frames are separated from each other or dust or the like hardly enters the inner space of the blade guard from between the adjacent partial frames.
Still another object of the present invention is to provide a fan filter that can enhance the sealing performance of the connecting portion between the blade guard and the motor portion by the filter material and can enhance the dust collection effect.

  The invention according to claim 1 has an annular filter material capable of covering the rear part of the blade guard that guards the rotating blades of the fan from the outside, and an annular frame shape that holds the filter material in a stretched state. A filter for an electric fan comprising a frame and a locking member for locking the frame to the blade guard, wherein the filter material is divided into a plurality of partial filter materials in a circumferential direction. Is a fan filter divided into a plurality of partial frames in the circumferential direction.

According to the first aspect of the present invention, when the back surface portion of the fan blade guard of the electric fan is covered with the filter material, the partial filter materials are connected in series by sequentially locking the partial frames to the blade guard. The back surface portion can be covered with the filter material.
Since the filter material is divided by the plurality of partial filter materials individually expanded by the partial frames, the attachment / detachment work of the filter material is facilitated, and the work time can be shortened. In addition, the filter material can be partially replaced in response to partial breakage or partial contamination of the filter material. As a result, the replacement time of the filter material can be shortened and the replacement cost can be reduced.
Moreover, the shape of the filter material in the stretched state is not an annular shape as in the prior art, but is a fan shape obtained by dividing the filter material into a plurality of shapes or a band shape approximate to this. Therefore, the yield at the time of cutting the filter material can be increased.

Each size of the blade guard of the electric fan used, specifically, the diameter of the blade guard, the length along the radial direction from the inner periphery to the outer periphery of the blade guard, the diameter of the motor unit, and the like are not limited.
The location of the blade guard covered by the filter material is not limited to the back surface. Both the back surface portion and the front surface portion of the blade guard may be used.
The material of the filter material is not limited. For example, a nonwoven fabric or a net can be employed. The kind of nonwoven fabric is not limited. For example, in addition to dust in the air due to air pollution, a nonwoven fabric having a basis weight capable of efficiently collecting pollen and the like is preferable. As a nonwoven fabric, the nonwoven fabric made from natural fibers, such as cotton, hemp, and silk, for example, and the nonwoven fabric made from synthetic fibers, such as a propylene-type resin fiber, a polyester-type resin fiber, and a polyethylene-type resin fiber, may be sufficient. Further, a non-woven fabric hardened with a synthetic resin may be used.

An arbitrary pattern, an arbitrary figure, an arbitrary picture, or the like may be printed on the front surface and / or the back surface of the filter material, for example, by various printing methods.
Moreover, you may provide deodorizing property and / or antibacterial property to a filter material. Examples of the substance that imparts deodorizing properties include powdered activated carbon. Furthermore, examples of the substance imparting antibacterial properties include titanium oxide. These may be included in the fiber of the filter material in advance, or may be attached to the filter surface by a coating method or the like after the production of the filter material, or impregnated into each fiber from the filter surface.
The number of divisions of the filter material into partial filter materials is not limited. For example, it may be divided into two or more than three. The length of each partial filter material may be uniform or non-uniform.

The material of the frame is not limited. For example, various synthetic resins such as polyethylene, polypropylene, polyethylene terephthalate, and synthetic rubber can be employed. Moreover, various metals, such as iron, stainless steel, aluminum, tin, brass, and copper, can be employed. Furthermore, trees such as bamboo can be used. The frame may be bendable or may have high rigidity. The thickness of the frame is not limited. The frame is thin when it can be bent, and the frame with high rigidity is thick.
The number of divisions of the frame into partial frames and the length of the partial frame are not limited. This corresponds to the number of filter divisions and the length of the partial filter material.
The fixing method to the partial filter material to the partial frame is not limited. For example, injection molding, fusion with a hot press, adhesion with an adhesive, hooking with a surface fastener, fastening with a fastening string, or sewing with a sewing machine can be employed.

The kind of locking member is not limited. For example, a clip, hook, hook, string, planar fastener, adhesive tape, magnet, or the like may be used. Moreover, a simple fitting structure may be sufficient.
There are no limitations on the shape, size, number of used locking members, formation position on the partial frame, and the like.
The size and shape of the filter material and the partial filter material are not limited. In short, any size and shape that can cover the entire rear surface of the blade guard from the outside may be used. However, as for the size of a general household electric fan, the average diameter of the blade guard is about 40 cm, and the average diameter of the motor unit is about 12 cm. In that case, the dimension of the preferable width | variety (short side) of a filter material and a partial filter material is 20-24 cm. Incidentally, the diameter of a large rotating blade for home use is 35 cm, and the diameter of a small rotating blade for home use is 30 cm.

  In the invention according to claim 2, the back surface portion has a large number of wires covering the rotating blades from the outside, and an annular outer peripheral wire in which tips of each wire are connected at predetermined intervals in the circumferential direction. The locking member is provided on the outer peripheral frame of each partial frame, and has a plurality of hooking claws that are hooked to the outer peripheral wire from the outer peripheral direction of the blade guard, 2. Each of the outer peripheral frames of the corresponding partial frame, which is longer than the diameter of the outer peripheral wire, and is provided at a position that can be hooked to the outer peripheral wire of the back portion having the outer diameter of the maximum dimensional tolerance. There is a filter for electric fans.

  According to the second aspect of the present invention, when the partial filter material is attached to the back surface portion of the blade guard, the latching claws of the partial filter material are respectively hooked on the outer peripheral wire from the outer circumferential direction of the blade guard. Each latching claw is longer than the diameter of the outer peripheral wire, and protrudes from the outer peripheral frame portion of the partial frame at a position where it can be hooked to the outer peripheral wire on the back surface having the outer diameter of the maximum dimensional tolerance. . Therefore, even if the actual circumferential dimension of the back surface is slightly different from the set dimension, each latching claw is in the length direction in the latched state on the outer peripheral wire as long as the error is within the allowable dimensional tolerance range. By moving appropriately, it is possible to cover a part of the back portion without any trouble by the partial frame.

The material of each partial frame is not limited. For example, synthetic resin and metal. Each partial frame may be a rigid body or an elastic body. However, an elastic body is preferable.
The material, shape, size, and number of the hooking claws are not limited as long as they can be hooked on the outer peripheral wire from the outer peripheral direction of the blade guard.

  In the invention according to claim 3, between the side portions of the adjacent partial frames, a side locking structure that locks the adjacent partial frames and the movement of the partial frames in the frame circumferential direction can be allowed. It is a filter for electric fans of Claim 1 or Claim 2 with which the various overlap part was each provided.

  According to invention of Claim 3, between the side parts of an adjacent partial frame is latched by the side part latching structure in the state which overlapped the overlap part. As a result, even if an external force acts on the adjacent partial frames in a direction away from each other, the engaged partial frames are separated from each other due to the locking force by the side locking structure and the overlap by the overlap portion. Or gaps between adjacent partial frames are difficult to open. As a result, dust and the like can be prevented from entering the inner space of the blade guard from this gap.

The components of the side locking structure are not limited. For example, a male side latching part and a female side latching part which can be latched on this can be adopted. In addition, a clip, a hook, a hook, a string, a surface fastener, an adhesive tape, a magnet, or the like may be used. The material, shape, size, and the like of the side locking structure are not limited. The side locking structure may or may not allow movement of the partial frames in the locked state in the frame circumferential direction.
The length of the overlap portion in the frame circumferential direction is not limited.

  According to a fourth aspect of the present invention, the inner peripheral portion of each partial filter material is provided with a skirt portion that covers the gap between the inner peripheral frame of each partial frame and the motor portion of the electric fan from the outside. It is a filter for electric fans given in any 1 paragraph among Claims 1-3.

According to the fourth aspect of the present invention, the skirt portion that covers the gap between the inner peripheral frame of each partial frame and the motor portion from the outside is provided on the inner peripheral portion of each partial filter material. The airtightness of the connecting portion between the blade guard and the motor portion is enhanced, and the dust collection effect can be enhanced.
The material, shape, and size of the skirt are not limited. The skirt portion may be formed integrally with the partial filter material or may be formed separately.

  According to the first aspect of the present invention, since the filter material is divided into a plurality of partial filter materials individually stretched by each partial frame, the filter material can be easily attached and detached, and the work time can be shortened. Can do. Moreover, when the filter material is partially damaged or soiled, only the defective partial filter material needs to be replaced together with the corresponding partial frame. Thereby, the replacement time of the filter material can be shortened, and the replacement cost can be reduced. Further, since the filter material in the stretched state has a fan shape or a band shape similar to the fan shape, the yield at the time of cutting the filter material can be increased.

  In particular, according to the second aspect of the present invention, the latching pawls of the respective partial frames are longer than the diameter of the outer peripheral wire, and the rear portion having the outer diameter of the maximum dimensional tolerance among the outer peripheral frame portions of the partial frames. Since the actual circumferential dimension of the back surface part is slightly different from the set dimension, the error is within the allowable dimensional tolerance range. A partial frame can cover a part of the back surface without hindrance.

  According to the third aspect of the present invention, the side portions of the adjacent partial frames are locked by the side portion locking structure with the overlapping portions being overlapped, so that the engaged partial frames It is possible to prevent dust from entering the internal space of the vane guard from the gaps generated between the partial frames.

  Furthermore, according to the invention described in claim 4, since the skirt portion that covers the gap between the inner peripheral frame of each partial frame and the motor portion from the outside is provided on the inner peripheral portion of each partial filter material, the filter The sealing performance of the connecting portion between the blade guard and the motor portion is increased, and the dust collection effect can be enhanced.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 11, reference numeral 10 denotes an electric fan filter according to Embodiment 1 of the present invention. The electric fan filter 10 covers the rotary blade 13 fixed to the output shaft of the motor unit 12 of the electric fan 11 from the outside. In addition, an annular filter member 16 capable of covering the back surface 15A of the blade guard 15 having a large number of wires 14, an annular frame-shaped frame 17 that holds the filter member 16 in a stretched state, and the frame 17 as the blade guard. And a locking claw (locking member) 18 </ b> A that is locked to 15.

On the upper part of the back surface portion 15A of the blade guard 15, a handle 19 is provided which is formed by bending a steel wire into a gate shape.
The filter material 16 is divided into two upper and lower partial filter materials 16A and 16B in the circumferential direction (FIGS. 2 to 8). Both partial filter materials 16A and 16B are formed by sequentially cutting a band-shaped filter sheet derived from a filter roll into a fan shape at a predetermined pitch. The filter sheet is obtained by bonding polyester resin fibers having a fiber diameter of about 10 denier with a predetermined binder. The basis weight is 30 g / m ² , the apparent thickness is 1 to 3 mm, and the filter pressure loss is 0.20 mmH ₂ O. Skirt portions 16a that cover the gap between the inner peripheral frame 17a of both partial frames 16A and 16B and the motor portion 12 from the outside may be provided on the inner peripheral portions of both partial filter materials 16A and 16B (FIG. 3). .

  The frame 17 is divided into two upper and lower partial frames 17A and 17B in the circumferential direction (FIGS. 4 to 8). Both partial frames 17A and 17B are made of polypropylene and are fan-shaped thin frame members as viewed from the front. Therefore, both partial frames 17A and 17B are elastic bodies that can be bent even with a small force. Both partial frames 17A and 17B are mainly composed of a pair of intermediate frames 17a, 17b, and an intermediate frame 17a, an outer frame 17b, and both ends of the frame in the length direction. 17c, and a pair of side frames (side portions) 17d horizontally mounted between both ends of the outer peripheral frames 17a and 17b. The inner peripheral frame 17a, the outer peripheral frame 17b, the intermediate frame 17c, the side frame 17d, and a later-described bulging frame 17e are respectively curved so as to match the external shape of the back surface portion 15A to which the frame 17 is attached and detached.

A bulging frame 17e that is curved in a substantially semicircular shape upward is integrally formed at an intermediate portion of the inner peripheral frame 17a of the upper partial frame 17A. A slit frame 17f for defining the slit S through which the handle 19 is inserted is formed integrally with the upper portion of the bulging frame 17e. The lower partial frame 17B is integrally formed with a single horizontal frame 17g that is horizontally mounted between the substantially intermediate portions of the intermediate frames 17c. The inner peripheral frame 17a and the horizontal frame 17g of the lower partial frame 17B are configured so that the intermediate portions in the length direction of the inner frame 17a and the horizontal frame 17g are located inside the blade guard 15 in order to avoid contact with the motor unit 12. It curves toward the space.
Both partial filter materials 16A and 16B are respectively fused by injection molding over the entire surface of the corresponding partial frames 17A and 17B.

The two partial frames 17A and 17B have a total of five hooks that are hooked on the outer peripheral wire 14a of the back surface portion 15A from the outer peripheral direction of the blade guard 15 to the middle and both ends in the length direction of each outer peripheral frame 17b. The pawls 18A are integrally formed. The outer peripheral wire 14a is an annular member in which the tip end of each wire 14 is connected at predetermined intervals in the circumferential direction. Each latching claw 18A protrudes in an orthogonal state on the outer edge surface of the outer peripheral frame 17b. The length of each latching claw 18A has about 1.5 times the diameter of the outer peripheral wire 14a. Each latching claw 18A is disposed at a position where it can be latched on the outer peripheral wire 14a of the back surface portion 15A having the outer diameter of the maximum dimensional tolerance in the corresponding outer peripheral frame 17b. The specific position is near the outermost peripheral edge of the outer peripheral frame 17b (FIG. 11).
Side locking structures 18B are respectively provided between a pair of side frames 17d that face each other of the partial frames 17A and 17B.

Hereinafter, the side portion locking structure 18B will be described in detail.
In the upper partial frame 17A, a pair of parallel female latching protrusions 18a are provided at the end of the both side frames 17d on the inner peripheral frame 17a side with a spacing of, for example, about 1 cm in the length direction of the side frame 17d. Each of the side frames 17d protrudes in the thickness direction. Both the female latching protrusions 18a are bent at a substantially right angle in the direction in which the upper end portions are close to each other.
In the lower partial frame 17B, a pair of parallel male hooking projections 18b are provided at the end of the both side frames 17d on the inner frame 17a side with an interval of about 8 mm in the length direction of the side frame 17d. Projecting in the width direction of the frame 17d. Knob pieces 18c extending in the thickness direction of the inner frame 17a are integrally formed at the upper ends of the ends of the male latching protrusions 18b. Gradually tapered latching guides 18d are integrally formed on the outer sides of the base portions of the two knob pieces 18c. Both the tabs 18c are longer than the length of the female latching projections 18a so that both the tabs 18c can be gripped even when the projections 18a and 18b are latched.

When the both latching projections 18a and 18b are latched, the pair of male latching projections 18b are gradually pushed into the gap between the female latching projections 18a. As a result, first, the tip portions of the inclined outer surfaces of the both latching guides 18d come into contact with the inner surface of the female latching protrusion 18a. When the pushing is further continued, the tip portions of both male latching projections 18b are gradually pushed and bent in the direction of approaching each other against their own spring force, and are pushed into the gaps between both female latching projections 18a. Then, when both the latching guides 18d are pushed to the end of both the female latching projections 18a, both the male latching projections 18b are returned to the original parallel state by their own spring force. As a result, both latching guides 18d are latched on the corresponding female latching protrusions 18a.
When the latch is released, both the tabs 18c are picked in the direction close to each other against the spring force of both the male projections 18b, and in this state, the both male projections 18b are placed between the two female projections 18a. Just pull out from each.

  Further, between the side frames 17d of the adjacent partial frames 17A and 17B, there are respectively provided overlap portions 30 that allow the partial frames 17A and 17B to move in the frame circumferential direction. The two overlap portions 30 are formed on the back side of the long edge strips 31 formed on the outer edge surfaces of the side frames 17d of the partial frame 17A and the outer edge portions of the side frames 17d of the partial frame 17B. Each has a long groove 32 to be stored. Each protrusion 31 and each groove 32 are formed from the end on the outer peripheral frame 17b side of the corresponding side frame 17d to the vicinity of the end on the inner peripheral frame 17a side.

Next, a method for using the fan filter 10 according to the first embodiment will be described.
As shown in FIGS. 1 to 11, when the fan filter 10 is used, the upper half and the lower half of the back surface portion 15 </ b> A of the blade guard 15 of the fan 11 are respectively covered with the corresponding partial filter materials 16 </ b> A and 16 </ b> B. Specifically, the latching claws 18A of the partial filter materials 16A and 16B are respectively latched on the outer circumferential wire 14a from the outer circumferential direction of the blade guard 15 in the upper half or the lower half of the back surface portion 15A.

  Each latching claw 18A is longer than the diameter of the outer peripheral wire 14a by 1.5 times, and the outer peripheral wire 14a of the back portion 15A having the outer diameter of the maximum dimensional tolerance among the outer peripheral frame portions of the partial frames 17A and 17B. Each is projected at a position where it can be hooked. Therefore, even if the actual circumferential dimension of the back surface portion 15A is slightly different from the set size, if it is within the range of the dimensional tolerance, each latching claw 18A is connected to the back surface portion in the latched state on the outer peripheral wire 14a. A part of the back surface portion 15A can be covered with the partial frames 17A and 17B without hindrance by slightly curving toward the central portion side of 15A and appropriately moving in the length direction. FIG. 11A shows a mounting state on the back surface portion 15A having the outer diameter with the maximum dimensional tolerance. FIG. 11B shows a mounting state on the back surface portion 15 </ b> A having an outer diameter as set. FIG. 11C shows a mounting state on the back surface portion 15A having an outer diameter with a minimum dimensional tolerance.

At this time, the side frames 17d of the adjacent partial frames 17A and 17B are connected by latching (locking) of the side locking structure 18B in a state where the overlap portions 30 are overlapped. Specifically, by inserting each protrusion 31 into the corresponding groove 32, the pair of male hooking protrusions 18b are pushed into the gap between the corresponding pair of female hooking protrusions 18a. The protrusions 18b are hooked on the female hooking protrusions 18a. The outer peripheries of the partial frames 17A and 17B are connected by a latching structure that allows a dimensional tolerance of each latching claw 18A to the outer peripheral wire 14a, while the inner peripheries of the partial frames 17A and 17B are side portions. The engagement structure 18B is connected with a latching structure that does not generate a gap. In addition, both the partial frames 17A and 17B are made of a bendable thin polypropylene. Therefore, when the fan filter 10 is mounted on the back surface portion 15A having the outer diameter with the maximum dimensional tolerance, the end of the outer peripheral frame 17b from the end on the inner peripheral frame 17a side between the side frames 17d of both the partial frames 17A and 17B. A gap may be formed near the end. However, this gap is closed by the overlap portion 30. The overlap portion 30 can be designed to be effective even in the case of the back surface portion 15A having an outer diameter that exceeds the maximum value of the set dimensional tolerance.
Thereby, even if an external force is applied to the adjacent partial frames 17A and 17B in a direction away from each other, the adjacent partial frames 17A and 17B are caused by the presence of the side locking structures 18B and the overlap portion 30. It is difficult for 17B to separate from each other or to open a gap between adjacent partial frames 17A and 17B (including a part thereof). As a result, dust and the like can be prevented from entering the internal space of the blade guard 15 from this gap.

As described above, the filter material 16 is divided through the pair of upper and lower partial filter materials 16A and 16B individually extended by the partial frames 17A and 17B, so that the filter material 16 can be easily attached and detached. Work time can be shortened. Moreover, the partial filter materials 16A and 16B can be individually replaced in response to partial breakage and partial contamination of the filter material 16. As a result, the replacement time of the filter material 16 can be shortened, and the replacement cost can be reduced.
Moreover, the shape of the filter material 16 in the stretched state is not an annular shape as in the prior art, but a fan shape obtained by dividing the filter material 16 into two. Therefore, the yield at the time of cutting the filter material 16 can be increased.

  And when the skirt part 16a which covers the clearance gap between the inner peripheral frame 17a of each partial frame 17A, 17B and the motor part 12 from the outside is provided in the inner peripheral part of each partial filter material 16A, 16B (FIG. 3), respectively. Thus, the sealing performance of the connecting portion between the blade guard 15 and the motor unit 12 by the filter material 16 is enhanced, and the back surface portion 15A is almost completely sealed by the fan filter, so that the dust collecting effect can be enhanced.

It is a perspective view which shows the use condition of the filter for electric fans which concerns on Example 1 of this invention. It is a rear view which shows the assembly state of the filter for electric fans which concerns on Example 1 of this invention. It is a rear view which shows the assembly state of the filter for electric fans which concerns on the other form of this invention. It is a rear view which shows the partial frame of the upper side of the filter for electric fans which concerns on Example 1 of this invention. It is a bottom view which shows the partial frame of the upper side of the filter for electric fans which concerns on Example 1 of this invention. It is a side view which shows the partial frame of the upper side of the filter for electric fans which concerns on Example 1 of this invention. It is a rear view which shows the partial frame of the lower side of the filter for electric fans which concerns on Example 1 of this invention. It is a bottom view which shows the partial frame of the lower side of the filter for electric fans which concerns on Example 1 of this invention. It is a side view which shows the partial frame of the lower side of the filter for electric fans which concerns on Example 1 of this invention. It is a principal part expansion perspective view which shows the side part latching structure of the filter for electric fans which concerns on Example 1 of this invention. (A) The attachment state of the latching claw to the back part which has the outer diameter of the largest dimension tolerance in the filter for electric fans which concerns on Example 1 of this invention is shown. (B) The attachment state of the latching claw to the back part which has the outer diameter as the set dimension in the filter for electric fans which concerns on Example 1 of this invention is shown. (C) The attachment state of the latching claw to the back part which has the outer diameter of the minimum dimensional tolerance in the filter for electric fans which concerns on Example 1 of this invention is shown.

Explanation of symbols

10 Fan filter,
11 Fan,
12 Motor part,
13 rotating blades,
14 Wire rod,
14a outer peripheral wire,
15 Feather guard,
15A rear part,
16 Filter material,
16A, 16B Partial filter material,
16a Skirt part,
17 frames,
17A, 17B partial frame,
17d side frame (side),
18A latching claw (locking member),
18B side locking structure,
30 Overlap part.

Claims (4)

An annular filter material that can cover the back of the blade guard that guards the rotating blades of the fan from the outside,
A frame having an annular frame shape for holding the filter material in a stretched state;
A fan filter provided with a locking member for locking the frame to the blade guard,
The fan filter is divided into a plurality of partial filter materials in the circumferential direction, and the frame is divided into a plurality of partial frames in the circumferential direction. The back portion has a large number of wires covering the rotating blades from the outside, and an annular outer peripheral wire connected at predetermined intervals toward the circumferential direction at the tip of each wire,
The locking member is
Provided on the outer peripheral frame of each partial frame, having a plurality of hooking claws hooked to the outer peripheral wire from the outer peripheral direction of the blade guard,
Each latching claw is longer than the diameter of the outer peripheral wire, and is provided at a position where it can be hooked to the outer peripheral wire of the back portion having the outer diameter of the maximum dimensional tolerance among the outer peripheral frames of the corresponding partial frames. The fan filter according to claim 1. Between the sides of adjacent partial frames,
A side locking structure that locks adjacent partial frames; and
The fan filter according to claim 1 or 2, further comprising an overlap portion that allows movement of the partial frame in the frame circumferential direction.   Of the inner peripheral part of each partial filter material, the skirt part which covers the clearance gap between the inner peripheral frame of each partial frame and the motor part of the said fan from the outside is provided, respectively. The fan filter according to any one of the preceding claims.

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