JP2007239701A - Duct collecting filter for electric fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the clogging of a dust collecting filter for an electric fan due to trapped dust, and to reduce labor for maintenance such as washing while keeping the amount of air passing through the filter almost unchanged in long time use. <P>SOLUTION: The duct collecting filter comprises a bagged filter body 4 having an approximately cylindrical peripheral wall portion 2 and a bottom portion 3, and a plurality of lock members 6 provided along an opening edge 5 of the filter body 4. When starting the electric fan with the lock members 6 locked to the peripheral edge of a safety guard of the electric fan, the filter body 4 is swollen to the downwind side to trap dust inside thereof. The filter body 4 has at least a double structure with a first non-woven cloth 7 which is arranged inside thereof and formed to be thick by superposing fibers, and a second nonwoven cloth 8 which is arranged outside thereof to cover the first nonwoven cloth. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dust collecting filter for a fan that is attached to a safety guard of a fan and collects floating dust from air blown by a blowing action of the fan.

  2. Description of the Related Art Conventionally, a dust collection filter of a type that is attached to a safety guard of a household electric fan is known (Patent Document 1). This dust collecting filter collects floating dust from the air when the bag-like filter body bulges to the leeward side due to the air blowing action of the fan and air passes through the filter body. The filter is composed of a nonwoven fabric, and air is guided from the inside of the filter to the outside through the fine eyes of the nonwoven fabric, while the floating dust cannot be passed through the fine eyes and is captured.

JP 2004-144003 A

  However, the fan filter disclosed in Patent Document 1 has a filter body made of a single non-woven fabric. Therefore, when the filter is mounted on the fan and used for a long period of time, floating dust is clogged in the eyes of the filter, and air passage characteristics. Decreases. For this reason, the amount of air passing through the filter surface gradually decreases, and the air blown by the fan flows back to the peripheral edge of the safety guard of the fan, and the reverse flow may cause dust collected inside the filter to be scattered again in the room. There is. In order to prevent such a situation, the filter must be frequently replaced or cleaned, which is inconvenient.

  In addition, the fan filter disclosed in Patent Document 1 is provided with rubber at the periphery of the opening of the bag-shaped filter body, and is attached to the safety guard of the fan by the contraction action of the rubber. However, when the filter is attached to the safety guard by the contracting action of rubber, there is a problem that if the contraction force is weak, the filter comes off from the safety guard when the fan blows. If the contraction force is too strong and the safety guard on the rear side of the fan has a relatively steep slope, the opening of the filter cannot be secured to the peripheral edge of the safety guard and the rear end of the safety guard rotates. Since it falls to the vicinity of the shaft and the diameter of the opening is reduced, the amount of air flowing into the filter is reduced and the dust collection effect is reduced.

  Accordingly, the present invention has been made for the purpose of solving the above-mentioned conventional problems, and suppresses clogging of the filter due to collected dust, so that the amount of air passing through the filter is little even after being used for a long time. A dust collection filter for an electric fan in which maintenance work such as cleaning is reduced without change, and a dust collection filter capable of always holding the filter opening at the peripheral edge of the safety guard.

  In order to achieve the above object, the present inventor has intensively studied, and when a filter main body is composed of a single thin nonwoven fabric, a problem of clogging always occurs, but a large number of fibers are used. It has been found that clogging is less likely to occur and a large amount of dust can be collected when the filter body is formed using a thick non-woven fabric formed in a superimposed manner. However, when the filter main body is composed of a single thick nonwoven fabric, the outer surface of the filter main body gradually becomes fuzzy due to long-term use, frictional contact with the outside, and the like. If this is left as it is, the nonwoven fabric gradually deteriorates. As a result, dust and air may pass through the filter main body as they are, and there may be a situation in which the collection efficiency is significantly reduced. In order to suppress such a decrease in the collection efficiency, it is considered that a structure in which the outer surface of the thick nonwoven fabric is covered with another nonwoven fabric so as not to be in frictional contact with the outside is considered suitable.

  Therefore, the present invention employs as a solution means a bag-like filter body composed of a substantially cylindrical peripheral wall portion and a bottom portion, and a plurality of locking members provided along the opening edge of the filter body. A dust collecting filter for an electric fan attached to a front surface, wherein the filter main body is disposed on an inner side thereof, and a first nonwoven fabric formed by thickening a fiber to be overlapped thereon, and an outer surface of the first nonwoven fabric. It is the point made into the at least double structure which comprises the 2nd nonwoven fabric to cover.

  According to such a configuration, the first non-woven fabric formed thick on the inside of the filter body can collect a large amount of dust without causing clogging. And since the 2nd nonwoven fabric is arranged in the state which covers the 1st nonwoven fabric, it protects the 1st nonwoven fabric and prevents the 1st nonwoven fabric from deteriorating even when it is used for a long time etc. , Suppresses a decrease in collection efficiency. Moreover, even if dust passes through the first nonwoven fabric, the outer second nonwoven fabric eventually captures the dust.

  In the above configuration, the first and second non-woven fabrics are preferably configured using a tourmaline sheet. In this case, the filter body reliably adsorbs and captures dust in the air blown from the fan.

  Moreover, it is preferable that the surface of the first nonwoven fabric is raised. Since the first non-woven fabric is covered with the second non-woven fabric, the fluff does not gradually become severe even if it is used for a long time. There is an advantage that dust can be collected. The “raised state” here refers not only to the raising treatment (raising process) on the nonwoven fabric, but also the tip of the short fiber naturally fluffs from the surface of the nonwoven fabric formed by superimposing relatively long short fibers. Including cases.

  The locking member may include a pair of front and rear locking plates facing inward from the opening edge of the filter body, and a slit that engages a bone of the safety guard of the electric fan may be provided at the tip of each locking plate. preferable. With such a locking member, the opening of the filter body can always be held on the peripheral edge of the safety guard.

  According to the dust collecting filter for an electric fan according to the present invention, the filter body covers the first nonwoven fabric formed thick by overlapping the fibers disposed on the inside thereof, and the first nonwoven fabric disposed on the outside thereof. Since the first nonwoven fabric inside the filter body can collect a large amount of dust without clogging, and the amount of air that passes through the filter even when used for a long time The maintenance work such as cleaning can be reduced with almost no change.

  Moreover, dust can be adsorb | sucked reliably by comprising a 1st and 2nd nonwoven fabric with a tourmaline sheet.

  In addition, by setting the fibers on the surface of the first nonwoven fabric in a raised state, it becomes possible to collect more dust at the raised portion while suppressing clogging.

  Further, the locking member for attaching the filter main body to the front side of the electric fan has a pair of front and rear locking plates facing inward from the opening edge of the filter main body, and engages the bone of the safety guard of the electric fan at the tip of each locking plate. When the slit is provided, the pair of front and rear locking plates can be attached so as to engage the front and rear bones with the annular frame around the safety guard around the filter, regardless of the strength of the air blown by the fan. The opening of the main body can always be sufficiently opened and held at the peripheral edge of the safety guard.

  Hereinafter, preferred embodiments of a dust collection filter for an electric fan according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a fan dust collection filter 1, and FIG. 2 is a side sectional view showing a usage state of the fan dust collection filter 1. The fan dust collection filter 1 is a bag-like shape having a substantially cylindrical peripheral wall portion 2 and a bottom portion 3, and has a breathable filter body 4 and an opening edge 5 of the filter body 4 at substantially equal intervals. A plurality of locking members 6,..., 6 are provided. As shown in FIG. 2, the opening edge 5 of the filter body 4 is formed in a size suitable for the outer diameter of the safety guard 22 that covers the blower fan 21 of a general household fan 20, and has a diameter of about 40 cm, for example. Yes. And it forms as a cylindrical bag body with a substantially constant diameter from the opening edge 5 of the surrounding wall part 2 to the circular bottom part 3. In addition, the depth from the opening edge 5 to the bottom part 3 is about 30 cm to about 40 cm.

  The peripheral wall portion 2 and the bottom portion 3 of the filter body 4 are formed as at least a double structure in which non-woven fabrics 7 and 8 having different thicknesses are arranged on the inner side and the outer side, respectively, and are formed thickly by overlapping a large number of fibers. The non-woven fabric 7 is arranged on the inner side, and the second non-woven fabric 8 thinner than that is arranged on the outer side, and the thin non-woven fabric 8 is attached so as to cover the thick non-woven fabric 7. The nonwoven fabrics 7 and 8 are configured as so-called tourmaline sheets that have been subjected to electrification treatment and have produced permanent electrical polarization, whereby dust can be reliably adsorbed. The thin nonwoven fabric 8 disposed outside the filter body 4 is a nonwoven fabric with no surface fluffing and is embossed as necessary. Moreover, the thick nonwoven fabric 7 arrange | positioned at the inner surface of the filter main body 4 does not emboss, etc., but raises the fiber of the surface. The thick nonwoven fabric 7 and the thin nonwoven fabric 8 may be bonded to each other or may be separated from each other.

  As shown in FIG. 2, the filter body 4 is attached so that the opening edge 5 is positioned substantially at the same position as the annular frame 23 around the safety guard 22 of the electric fan 20 by the locking member 6. It is provided on the front side of the electric fan 20 so as to flow into the filter through the opening edge 5. Therefore, when the electric fan 20 is activated, the cylindrical bag shape of the filter body 4 swells to the front side of the safety guard 22, and the air inside the filter flows through both the peripheral wall portion 2 and the bottom portion 3 and flows out to the outside. The double-layered filter body 4 composed of the non-woven fabric 7 and the thin non-woven fabric 8 collects the floating dust contained in the air passing therethrough.

  At this time, since the dust collecting filter 1 for a fan has a thick nonwoven fabric 7 provided inside the filter body 4, each of the fibers on which the nonwoven fabric 7 is superimposed is sent in the air sent from the fan 20. Adsorbs and collects dust. That is, as shown in FIG. 3, the thick nonwoven fabric 7 has a structure in which a large number of fibers are superimposed, so that the dust 9 is not collected only by the inner surface of the filter body, but the surface portion or intermediate portion of the multiple structure, Furthermore, the dust 9 is efficiently collected at the back surface portion of the back. Generally, when the filter body is made of a single thin non-woven fabric and dust is collected only on the surface, clogging is likely to occur, air permeability decreases with long-term use, and dust collection efficiency decreases. However, by arranging the thick non-woven fabric 7 formed by superimposing a large number of fibers inside the filter main body 4 as in this embodiment, a filter configuration in which clogging hardly occurs is realized. Furthermore, since the thick nonwoven fabric 7 in which the fibers on the surface are raised can collect more dust at the raised portion, the air permeability is not deteriorated, and the clogging suppressing effect becomes higher.

  In this way, the filter main body 4 efficiently collects dust in the air blown from the electric fan 20 by the thick nonwoven fabric 7 provided on the inner side, so that the dust is conveyed to the thin nonwoven fabric 8 provided on the outer side. However, even if dust passes through the thick nonwoven fabric 7, the dust is finally captured by the thin nonwoven fabric 8 provided on the outside, so that it passes through the filter body 4. It is collected without. Further, since the dust guided to the thin nonwoven fabric 8 is small, the nonwoven fabric 8 is not easily clogged even when used for a long time.

  Therefore, by forming at least a double structure of the thick nonwoven fabric 7 in which the filter body 4 is disposed on the inside and the thin nonwoven fabric 8 disposed on the outside thereof, it is possible to effectively collect floating dust. Thus, a dust collecting filter that is less clogged and can be used for a longer time than the conventional product is realized. Moreover, since the thin nonwoven fabric 8 protects the thick nonwoven fabric 7, even if it uses for a long time, the thick nonwoven fabric 7 does not deteriorate, and it prevents that the dust collection efficiency falls.

  FIG. 4 is a view showing the locking member 6 provided on the opening edge 5 of the filter body 4 and a mode of attaching to the safety guard 22 of the electric fan 20. In FIG. 4, one locking member 6 is shown, but the same applies to the other locking members. The locking member 6 is formed of a single plate-like body made of resin, and a substantially central portion thereof is attached to the opening edge 5 of the filter body 4 and is bent so that both ends face inward from the opening edge 5. Thus, a pair of front and rear locking plates 6a and 6b are formed. A slit 6c that engages with a bone 24 extending in the front-rear direction from an annular frame 23 at the periphery of the safety guard 22 of the electric fan 20 is provided at the tip of each locking plate 6a, 6b. The width of the slit 6c is narrower than the diameter of the bone 24, and a locking hole 6d having substantially the same diameter as the bone 24 is provided at the back end of the slit 6c. Thus, when the filter body 4 is mounted on the safety guard 22 of the electric fan 20, the pair of front and rear locking plates 6a and 6b are fitted from the outside of the safety guard 22 with the annular frame 23 sandwiched therebetween, and the slits 6c and 6c are interposed. Thus, the locking holes 6d and 6d are engaged with the bones 24 and 24 extending in the front-rear direction of the annular frame 23 to prevent them from coming off. At this time, since the pair of locking plates 6a and 6b are engaged with the bones 24 and 24 with the annular frame 23 sandwiched therebetween, the movement of the locking member 6 in the front-rear direction is restricted, and the opening of the filter body 4 is always open. The edge 5 can be held at a position along the annular frame 23. Therefore, since the locking member 6 is attached to the safety guard 22 of the electric fan 20 with the opening edge 5 of the filter main body 4 always sufficiently open, the total air volume sent by the air blowing action of the electric fan 20 is efficiently reduced inside the filter main body 4. Can lead to. Combined with the double structure of the filter body 4 described above, an efficient dust collecting action can be maintained for a long time.

  As described above, the fan dust collection filter 1 of the present embodiment has at least a double structure in which different thick nonwoven fabrics 7 and 8 are arranged on the inner side and the outer side of the filter body 4, respectively, and is thick with a large number of fibers superimposed. Since the non-woven fabric 7 is arranged on the inner side and the thinner non-woven fabric 8 is arranged on the outer side, a large amount of dust can be collected without clogging the thick inner non-woven fabric 7 and used for a long time. However, the amount of air passing through the filter body 4 is hardly changed, and maintenance work such as cleaning can be reduced. The locking member 6 for attaching the filter main body 4 to the safety guard 23 of the electric fan 20 includes a pair of front and rear locking plates 6a and 6b facing inward from the opening edge 5 of the filter main body 4, and each locking plate 6a. , 6b is provided with a slit 6c that engages with the bone 24 of the safety guard 22 of the electric fan 20, so that the pair of front and rear locking plates 6a, 6b sandwich the annular frame 23 around the safety guard and It can be attached so as to engage with the front and rear bones 24, and the opening of the filter body 4 can always be fully opened and held at the periphery of the safety guard regardless of the intensity of the air blow by the electric fan 20. Therefore, it is possible to always ensure a sufficient amount of air flowing into the filter body 4.

  In the above embodiment, the case where the filter main body 4 has a double structure of the thick nonwoven fabric 7 and the thin nonwoven fabric 8 is shown as an example in the figure. You may do it.

  Moreover, although the case where the nonwoven fabric 8 which covers the thick nonwoven fabric 7 is thin was illustrated in the said embodiment, the thickness of the nonwoven fabric 8 arrange | positioned on the outer side of the filter main body 4 is not restricted to this, Even if it is a thick thing I do not care. However, even in that case, the outer nonwoven fabric 8 is preferably a nonwoven fabric with no fluff on the surface.

It is a perspective view which shows the dust collection filter for electric fans. It is side surface sectional drawing which shows the use condition of the dust collection filter for electric fans. It is an expanded sectional view which shows the dust collection effect | action of the filter main body of a double structure. It is a figure which shows the latching member provided in the opening edge of the filter main body, and shows the aspect attached to the safety guard of an electric fan.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dust collection filter for electric fans 2 Perimeter wall part 3 Bottom part 4 Filter body 5 Opening edge (opening part)
6 Locking member 6a, 6b Locking plate 6c Slit 7 Thick nonwoven fabric (first nonwoven fabric)
8 Thin nonwoven fabric (second nonwoven fabric)
9 Dust
20 Fan 22 Safety guard

Claims (4)

A fan-shaped filter main body comprising a substantially cylindrical peripheral wall portion and a bottom portion, a plurality of locking members provided along the opening edge of the filter main body, and attached to the front surface of the electric fan,
The filter main body is arranged on the inside thereof, and includes at least a double nonwoven fabric formed by thickening the fibers by superimposing fibers and a second nonwoven fabric arranged on the outside and covering the first nonwoven fabric. A dust collection filter for an electric fan characterized by a structure.   The dust collection filter for an electric fan according to claim 1, wherein the first and second nonwoven fabrics are composed of a tourmaline sheet.   The dust collecting filter for an electric fan according to claim 1 or 2, wherein the first nonwoven fabric has raised fibers on the surface.   The locking member includes a pair of front and rear locking plates facing inward from an opening edge of the filter body, and a slit that engages with a bone of a safety guard of an electric fan is provided at a tip of each locking plate. The dust collection filter for electric fans according to any one of 3 above.

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