JP3016417B2 - Filter element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter element used for a filter for filtering a fluid such as a gas or a liquid, and more particularly, to a filter element in a filter element which can be easily manufactured. The present invention relates to a prefabricated filter element that can easily perform replacement and disposal.

[0002]

2. Description of the Related Art In a filter element for filtering a fluid such as a gas or a liquid, a filter medium in which a combustible material such as filter paper or nonwoven fabric is formed into a cylindrical shape is used, and the fluid is circulated from the outside to the inside of the filter medium. Some are configured to be filtered.

[0003] The filter element configured as described above has a rigidity capable of maintaining the cylindrical shape on which the filter medium is formed when the fluid passes through the filter medium, and has a flowability through which the fluid can pass. Core material
It is provided along the inside of the filter medium (the side where the swelling of the filter medium due to the pressure of the flowing fluid can be suppressed). Further, in order to prevent deformation of the filter medium, upper and lower end plates are provided at both ends in the vertical direction of the filter medium.

Here, since the core material is disposed so as to contact the inner peripheral surface of the cylindrical filter material, it is not always necessary to adhere the core material to the filter material. However, the upper and lower end plates allow the fluid to pass through the filter material. In this case, the filter medium needs to have a rigidity capable of maintaining the cylindrical shape on which the filter medium is formed. Therefore, the filter medium is often fixed to and integrated with the filter paper by an adhesive.

[0005]

In the fluid filter provided with the filter element formed as described above,
If the filtration efficiency drops, the filter element needs to be replaced. It is desirable that the replaced filter element be incinerated, but in the filter element configured as described above, the filter medium is formed of a flammable material, but the core material and the upper and lower end plates are made of metal or the like. In some cases, the filter element is formed of a non-combustible material, and if the filter element is adhered to the filter medium, there is a problem that the entire used filter element cannot be burned.

Further, in order to bond the core material and the upper and lower end plates to the filter material, a machine for applying an adhesive and a mechanical facility such as a drying furnace for heating and curing the applied adhesive are required. Becomes Further, when heating is performed to cure the adhesive, gas may be generated, and the working environment is deteriorated by the use of the adhesive. Therefore, it is preferable to reduce the bonding work as much as possible in the manufacturing stage of the filter element. Furthermore, when the upper and lower end plates are used and these materials are bonded to form a filter element, there is a problem that the filter element, which is a replacement part, becomes expensive.

[0007] The present invention has been made in view of such a problem, and it is possible to easily replace only the filter medium and discard it, and it is easy to manufacture, and to suppress the deterioration of the working environment in the manufacturing process. It is another object of the present invention to provide a filter element which can be manufactured at a low cost.

[0008]

In order to achieve the above object, a filter element according to the present invention comprises a long strip-shaped filter paper which is bent into a bellows shape with a substantially constant bending width to form a chrysanthemum-shaped cross section. A filter medium formed into a cylindrical shape extending in the vertical direction having
An inner tube formed along the inner peripheral surface of the filter medium and inserted into the inner periphery of the filter medium, and is detachably disposed in a filter case including a lid member and a case body. The fluid is circulated from the outside to the inside to filter the fluid. The inner tube is formed with a flow hole having a flowability for allowing a fluid to pass therethrough. At the upper end and the lower end of the filter medium, opposing outer surfaces of the filter paper formed in a chrysanthemum flower form a first resin member (of the embodiment). Hot melts 33a and 33b are joined together, and a ring-shaped second resin member (corresponding to the molten resin seal member of the embodiment) connected to the first resin member is provided on the outer periphery of the chrysanthemum-shaped cylindrical portion. The seal member is constituted by the second resin member. When the filter element is disposed in the filter case, the seal members located at the upper and lower ends are respectively press-fitted into the lid member and the seal member holding portion in the case body, and the inner side of the filter medium near the upper and lower ends of the filter medium. And the outside.

[0009]

According to the filter element configured as described above, the inner tube can maintain the cylindrical shape of the filter medium even when the fluid passes from the outside to the inside of the filter medium, and the inside and outside of the filter medium can be maintained by the seal member. Is sealed, so that the fluid flowing from the outside does not flow out of the case without passing through the filter medium. Then, if the lid member and the case body are detached, the filter element can be easily removed from the filter case, so that the filter element with reduced filtration ability can be easily replaced.

Preferably, the first resin member is formed using a hard resin, and the second resin member is formed using a soft resin. In this case, the filter paper can be held in a chrysanthemum shape by the first resin member, and a good seal member made of a seal can be obtained by the second resin member. further,
It is preferable to provide a tapered insertion guide serving as a guide when the seal member is press-fitted in the portion where the seal member is press-fitted in the lid member and the case main body, thereby holding the filter medium by the upper and lower holding members. Is performed, the seal member can be smoothly pressed into the seal member holding portion without damaging the seal member.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. First, an air filter 1 using a filter element 2 according to the present invention will be described with reference to FIG. This air filter 1 has a filter case 10
The filter element 2 is disposed inside the filter case, and the air that has flowed into the filter case 10 is filtered by the filter element 2 and then discharged.

The filter case 10 comprises a case body 11 formed in a bottomed cylindrical shape, and a lid member 12 fitted to the case body 11. A ring-shaped case seal member 18 is provided at a fitting portion between the case body 11 and the lid member 12.
The case body 11 and the cover member 12 are leaked by locking a plurality of locking members 17 (only one is shown in FIG. 1) on the outer periphery of the cover member 12. Make sure there is no contact.

An air inlet 1 is provided on the side of the case body 11.
3 is formed to protrude outward, and the case body 1
An exhaust hole 14 through which air that has passed through the filter element 2 is discharged is formed on the bottom surface of the filter 1 so as to project outward. In addition, since the inflow hole 13 is formed eccentrically from the center of the case main body (the front side in FIG. 1), it is represented by a chain line in FIG. The exhaust hole 14 is also formed to protrude inside the case body 11 so as to be connected to an inner peripheral space of the filter element 2 described in detail later.

An upper seal member holding portion 12a is formed to extend downward inside the upper surface of the lid member 12. The inner peripheral surface 12b of the upper seal member holding portion 12a has an arc or taper (opened downward) such that the diameter is smaller on the upper side (upper side of the lid member 12) than on the lower end side. Arc shape). A lower seal member holding portion 11a is also formed on the bottom surface 11c of the case body 11 so as to extend upward.
The inner peripheral surface 11b of a is also formed in an arc shape that opens upward.

The side of the case body 11 where the air inlet 13 is provided (left side in FIG. 1).
Since there is a distance between the inner peripheral surface 11d and the outer peripheral surface of the filter element 2, the lower seal member holding portion 11a is independently formed so as to protrude from the bottom surface 11c of the case body 11, but other portions ( 1 (the right side in FIG. 1), the inner peripheral surface 11e and the outer peripheral surface of the filter element 2 are close to each other, so that the lower seal member holding portion 11a is formed integrally with the inner peripheral surface 11e.

Next, the filter element 2 will be described with reference to FIG. The filter element 2 includes an inner tube 20 and a filter medium 30. The inner tube 20 includes a tube body 21 having a plurality of flow holes 23 formed therein for discharging air passing through the filter medium 30 to the exhaust holes 14, and a tube body 21.
And a filter medium holding portion 22 formed to extend radially from the outer periphery of the filter medium.

The inner tube 20 is formed of a metal material or a flammable resin material, and the outer peripheral surface 21a of the tube main body 21 is formed with an outer diameter along the inner peripheral surface of the filter medium 30 described in detail later. The length is formed substantially the same as the length of the filter medium 30 (the dimension in the vertical direction).

The filter medium 30 held by the inner tube 20 configured as described above will be described with reference to FIGS. The filter medium 30 is a so-called chrysanthemum-shaped filter medium in which the filter paper 31 formed in a long strip shape is bent into a bellows shape with a substantially constant bending width and formed into a cylindrical shape. The bent ridgeline 31c near the upper and lower ends of the front side (outer peripheral side) 31a of the filter paper 31 is fixed by molten resin adhesives 33 and 34 called hot melt.

The vicinity of the upper end of the opposite surface on the front side 31a of the filter paper 31 is fixed by a hot melt 33b between filter papers connected to the hot melt 33a on the outer peripheral side. Thereby, while maintaining the chrysanthemum form of the filter medium 30, the air flowing in from the front side 31a of the filter paper 31 passes through the upper and lower ends without passing through the filter paper 31, and the back side (inner peripheral side) 31b of the filter paper 31 Does not flow into The hot melts 33a, 33b fixed on the outer peripheral side and between the filter papers are provided.
Is a so-called hard hot melt that undergoes little deformation when an external force is applied.

Further, a molten resin seal member 38 extending to the outer peripheral portion of the upper end surface 31e of the filter paper 31 is welded to the outer periphery of the hot melt 33a on the outer peripheral side. The molten resin seal member 38 is a so-called soft hot melt, and has a larger deformation when an external force is applied than the hard hot melt described above. In the vicinity of the lower end of the filter paper 31, the outer peripheral side and the space between the filter media are fixed by the hard hot melt 34 in the same manner as described above, and the soft hot melt 39 is also welded to the outer periphery of the hard hot melt 34.

As shown in FIG. 4, the filter paper 31 has horizontally long embossed portions 32a and 32b protruding alternately on a front side 31a and a back side 31b. The embossed portion 32a protruding on the front side 31a is formed so as to be in contact with the embossed portion 32a formed on the opposing surface (front side), and is formed so as to come into contact with the embossed portion 32b formed on the back side 31b. Also embossed part 32b
They are formed so that they come into contact with each other.

As described above, when the width W1 of the ridge 31c on the outer peripheral side of the filter paper 31 is slightly larger than the width W2 of the ridge 31d on the inner peripheral side, and the filter paper 31 is formed into a chrysanthemum by connecting with a hot melt. Emboss 3 on adjacent folds
2a and 32b are formed, so that the front side space 36a and the back side space 36b are respectively formed, and even when receiving the pressure of the air to be filtered, the adjacent folds are in close contact, and the effective filtration area is reduced. It is prevented from lowering.

Therefore, even if the filter papers 31 are densely arranged, the folds are maintained and they do not adhere to each other. In the case of the filter element 2 of this embodiment, the bellows-folded filter medium 30 is considerably densely arranged. It can be arranged as a filter element which is compact and has a large filtration area. In addition, when the filter paper 31 is formed into a chrysanthemum-like shape, since it is performed by a hard hot melt, it is not necessary to use a general adhesive such as a so-called bond for bonding the filter paper 31, and the working environment is deteriorated. There is no.

When the filter medium 30 constructed as described above is to be held in the inner tube 20, as shown in FIG.
b so as to protrude into the inner peripheral space 37 of the filter medium 31. As a result, the filter medium 3 with the outer peripheral surface 21a of the tube body 21 positioned along the inner peripheral surface formed by the bent ridgeline 31d on the inner peripheral side of the filter paper 31.
0 is retained. In addition, the filter medium 30 does not rotate with respect to the inner tube 20 due to the function of the filter medium holding section 22, and the filter medium holding section 22 is sandwiched between the back surfaces 31 b of the filter papers 31. Occurs.

When the inner tube 20 is formed of a metal material, the inner tube 20 cannot be bonded to the filter medium 30. However, when the inner tube 20 is formed of a flammable resin material, the inner tube 20 is bonded to the filter medium 30. Is also good. In this case, since the bonding area can be increased by the filter medium holding portion 22, the bonding can be performed more firmly.

A procedure for mounting the filter element 2 thus configured in the filter case 10 will be described with reference to FIG. The filter element 2 has an exhaust hole 14
Is placed on the bottom surface 11c of the case main body 11 so as to project below the inner peripheral space 25. And the lid member 1
2 so that the fitting protrusion 12a formed to protrude downward inside the inner space 2 is positioned above the inner peripheral space 25.
Is placed on the upper part of the case body 11 (the upper part of the filter element 2). Then, the cover member 12 is fixed to the locking fitting 17.
When the filter element 2 is pressed down so as to be locked with the case body 11, the filter element 2 is pressed down from above and below.

In the filter element 2, FIG.
As shown in (A), a soft hot melt 39 is formed on the lower end face 31e and the outer peripheral side of the filter paper 31 so as to protrude by t1 and t2, respectively. Then, the inner peripheral surfaces 11b, 12b of the lower and upper seal member holding portions 11a, 12a.
Is formed in an arc shape that opens downward and upward as described above, so that when the filter element 2 is depressed, the filter element 2 is deformed along the arc of the inner peripheral surface 11b as shown in FIG.

When the filter element 2 is further pushed in (the lid member 12 is locked with the case body 11 by the locking metal member 17), the inner peripheral surface 11b of the soft hot melt 39 becomes thin as shown in FIG. It is press-fitted so as to bite into the part, and closely adheres to the inner peripheral surface 11b and the like. Therefore, there is no gap between the case body 11 and the cover member 12 and the outer periphery of the filter medium 30, and the air is not circulated between the upper and lower end surfaces of the filter paper 31. It is securely held in the filter case 10.

In the present embodiment, the protruding amount t1 of the hot melt before mounting the filter element 2 shown in (A) is 3 mm, and t2 is 6 mm. Then, the protruding amount t1 'of the hot melt after mounting the filter element 2 shown in (C) is 2 mm, and t2'
Is 4 mm. In FIG. 5, the vicinity of the lower end of the filter element 2 is shown, but the vicinity of the upper end is also in the same state, and the soft hot melt 38 similarly has a circular arc on the inner peripheral surface 12b of the upper seal member holding portion 12a. Transform along.

With the filter element 2 held as described above, the air flowing from the inflow hole 13 as shown by the arrow IN is filtered through the filter paper 31 from the outer peripheral space 19 as shown by the arrow R. Thereafter, the air flows into the inner peripheral space 25 through the circulation hole 23 and is discharged from the air filter 1 through the exhaust hole 14 as shown by an arrow OUT. At this time, the upper and lower ends of the filter paper 31 are hard hot melts 33 and 3 respectively.
Since the air is sealed by the filter 4, the inflowing air is not exhausted to the outside of the case 10 without passing through the filter paper 31.

In the air filter 1 configured as described above, the upper seal member holding portion 12a and the lower seal member holding portion 11a are formed integrally with the lid member 12 and the case body 11, respectively. . For this reason, the outer peripheral space 19 and the inner peripheral space 25 communicate with each other via the filter element 2, and a separate sealing member (for example, the outer peripheral of the exhaust hole 14 and the tube) is provided between the outer peripheral space 19 and the inner peripheral space 25. There is no need to provide a seal member that seals the gap between the main body 21 and the inner periphery.

In the air filter 1 configured as described above, if the filtration efficiency of the filter element 2 is reduced due to dust or the like adhering to the filter paper 31 due to long-term use, the filter medium 30 in the filter element 2 is not used.
Exchange.

In order to replace the filter medium 30, first, the locking member 17 is removed, the cover member 12 is removed from the case body 11, and the filter element 2 is removed from the case body 11 and the cover member 12. Here, when the inner tube 20 is made of a metal material (made of a noncombustible material), the inner tube 20 is pulled out of the filter medium 30. (Note that
When the inner tube 20 is formed of a flammable resin (a flammable material), it may be left as it is. As a result, the filter element 2 is made of only a flammable material, so that the replaced filter medium 30 can be incinerated, and the used filter medium 30 can be easily processed.

Further, according to the air filter 1 configured as described above, since the filter element 2 has no end plate, a new filter element 2 as a replacement part can be manufactured at low cost. If the inner tube 20 is removed and used repeatedly, the filter medium 30 can be used.
Since only the replacement is required, replacement parts can be manufactured at lower cost. Further, since a seal member for sealing between the outer peripheral space 19 and the inner peripheral space 25 is provided in the filter medium 30 to be replaced, the seal member becomes new each time the filter member is replaced, and there is no possibility of air leakage due to settling of the seal member.

In each of the embodiments described above, the case where the filter element according to the present invention is used for the air filter in which the fluid to be filtered is air has been described. However, the present invention is not limited to this, and the present invention is not limited thereto. Of course, it can also be used for a filter element for filtering other fluids. Therefore, the filter medium to be used is not limited to the filter paper, and in consideration of the characteristics of the fluid to be filtered and the material to be removed,
Of course, other materials such as nonwoven fabric and glass wool may be used. Even when filter paper is used, it is not always necessary to form an emboss.

In order to seal the inner and outer peripheral sides of the filter medium, it is not always necessary to use a hot melt.
You may comprise so that it may seal using an adhesive agent. Further, as a sealing member in place of each of the soft hot melts 38 and 39, a material such as an airtight sponge or an elastic rubber may be used.

[0037]

As described above, according to the present invention,
The inner tube can maintain the cylindrical shape of the filter medium even when the fluid passes from the outside to the inside of the filter medium, and since the inside and outside of the filter medium are sealed by the sealing member, the fluid flowing in from the outside can be used as the filter medium. Does not flow out of the case without passing through. Then, if the lid member and the case body are detached, the filter element can be easily removed from the filter case, so that the filter element with reduced filtration ability can be easily replaced.

It is preferable that the first resin member is formed using a hard resin, and the second resin member is formed using a soft resin. In this case, the filter paper can be held in a chrysanthemum shape by the first resin member, and a good seal member made of a seal can be obtained by the second resin member. further,
It is preferable to provide a tapered insertion guide serving as a guide when the seal member is press-fitted in the portion where the seal member is press-fitted in the lid member and the case main body, thereby holding the filter medium by the upper and lower holding members. Is performed, the seal member can be smoothly pressed into the seal member holding portion without damaging the seal member.

[Brief description of the drawings]

FIG. 1 is a sectional view of an air filter provided with a filter element according to the present invention.

FIG. 2 is a perspective view of the filter element.

FIG. 3 shows the filter element III in FIG. 2;
It is a III sectional view.

FIG. 4 shows the filter element IV- in FIG.
It is IV sectional drawing.

FIG. 5 is a partial sectional view of the filter element;
(A) shows a state before the filter medium is attached, (B) shows a state in the middle of attachment, and (C) shows a state after the filter medium is attached.

FIG. 6 shows the filter element VI- in FIG.
It is VI sectional drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air filter 2 Filter element 10 Filter case 20 Inner tube 30 Filter material

Claims (2)

(57) [Claims] 1. A filter material formed by bending a long band-shaped filter paper into a bellows shape having a substantially constant bending width and having a chrysanthemum-shaped cross section and extending in a vertical direction. An inner tube that is formed along the peripheral surface and is inserted and disposed on the inner periphery of the filter medium.The inner tube is detachably disposed in a filter case including a lid member and a case body. A filter element for filtering a fluid by flowing a fluid inside, wherein a flow hole having a flowability for passing the fluid is formed in the inner tube, and an inner surface of the lid member and an inner surface of the case body are respectively provided. A cylindrical seal member holding portion is formed, and at the upper end and the lower end portion of the filter medium, opposing outer surfaces of the filter paper formed in a chrysanthemum shape are joined by a first resin member, and a chrysanthemum shape cylindrical portion is formed. A ring-shaped second resin member connected to the first resin member is provided around the periphery, and a seal member is formed by the second resin member. When the second resin member is disposed in the filter case, it is located at upper and lower ends. A filter element, wherein the seal member is press-fitted into the cover member and the seal member holding portion of the case body to seal the inside and outside of the filter medium near upper and lower ends of the filter medium. 2. The method according to claim 1, wherein the first resin member is formed using a hard resin, the second resin member is formed using a soft resin, and the lid member and the seal member in the case body are formed. The filter element according to claim 1, wherein a tapered insertion guide serving as a guide when the seal member is press-fitted is provided at a portion where the seal member is press-fitted.