JP3300199B2 - Flat filter for dust collector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat filter structure suitable for use in various kinds of dust collectors.

[0002]

2. Description of the Related Art A plate-shaped filter having a large number of folds formed continuously in a horizontal direction is provided with a fold 10a having a cross-sectional shape as shown in FIG. 8 or as shown in FIG. Are formed continuously with circular folds 13... In particular, in the case of a fold type fold 10a, if the ratio of the y-dimension to the x-dimension shown in FIG. Has a feature that a larger filter area can be mounted in a dust collector than a conventional filter formed in a cylindrical shape. Further, in the case of folds 13 having a circular cross section, x
It has the feature that the dimension and the y dimension are the same and the strength is stable.

In FIG. 8, (a) and (b) show a front view and a side view of a conventional flat filter 10 in which folds 10a... In these drawings, reference numerals 11 and 12 designate reinforcing resin plates fixed to both ends of the flat filter 10.

[0004]

However, in the case of the above-mentioned flat filter 10 in which the folds 10a are continuously formed, an external pressure is applied to each fold 10a of the filter 10 at the time of filtration as shown by an arrow in FIG. When the pulse jet is removed, the inner pressure is applied in the opposite direction and the fold 10a is deformed. Therefore, when the x-dimension and the y-dimension shown in FIG. The pressure receiving area differs between the y-direction surface and the y-direction surface, causing a load difference. As shown in FIG. 10 (a), the burrow-shaped fold 10a is crushed by the external pressure, and conversely, as shown in FIG. 10 (b). As a result, the folds 10a are expanded by the internal pressure, and as a result,
As shown in FIG. 8B, there is a problem that the entire filter 10 is curved.

Conventionally, resin plates 11 and 12 made relatively thick as shown in FIG. 8 are fixed to both ends of the filter 10 to reinforce the filter 10 so that the entire filter 10 is not curved. As shown in FIG.
The fixing of the filters 1 and 12 has the problem of increasing the manufacturing cost of the filter 10 and the problem of reducing the surface area of the filter 10 by the amount by which the resin plates 11 and 12 are fixed.

Although the difference in load applied between the x-direction surface and the y-direction surface depends on the dimensional ratio of x: y, FIG. 11 shows that the external pressure applied to a filter of a general dust collector is 100 mmH ₂ O.
(100 kg / m ² ), filter length 1 m
The table shows the difference in load with respect to the ratio of y / x received per hit. From this table, it is clear that the difference in load is zero when y / x = 1, and it is strong against any force. found.

When the folds 13 of the filter are circular as shown in FIG. 12, the x-dimension and the y-dimension are the same and the strength is the most stable. On the other hand, dust adheres to the outer surface of the filter. Considering the necessary clearance at the time of removing the pulse jet, there is a problem that the filter mounting surface area per unit space is reduced.

Accordingly, a technical problem of the present invention is that each fold of the flat filter has sufficient strength against external pressure and internal pressure without fixing resin plates for reinforcement to both ends of the flat filter. To prevent deformation.

[0009]

Means taken by the present invention to solve the above-mentioned technical problems are as follows.

(1) Two folds which are continuous in the lateral direction are each formed into a regular hexagonal cross section by joining two filter molding materials in which a convex portion having a substantially mountain-shaped cross section is repeatedly formed in the longitudinal direction.

(2) Two folds which are continuous in the lateral direction are each formed into a regular octagonal cross section by joining two filter molding materials having a convex portion having a substantially umbrella-shaped cross section repeatedly in the longitudinal direction.

(3) By joining two filter moldings having a convex section having a substantially mountain-shaped or umbrella-shaped cross section in the longitudinal direction, the fold ratio between the longitudinal and lateral folds can be reduced. Is in the range of 0.7 to 1.2, a hexagonal cross section,
Or, be configured in an octagonal cross section.

(4) A synthetic fiber such as polyester or a material based on a synthetic fiber is used as a filter material, and the filter material is heated and formed by pressing.
Two filter molding materials are joined by hot press, adhesive or hot melt.

(5) A venturi for injecting a pulse jet is integrally fixed to the mouth portion of each fold continuous in the lateral direction using a synthetic resin.

[0015]

The respective means described in the above (1) to (5) operate as follows.

According to the means described in the above (1), since the folds of the filter formed continuously in the horizontal direction are each formed in a regular hexagonal cross section and the length of each side is equal, the filtering time (at the time of suction)
Because both sides receive the same surface pressure for both the external pressure and the internal pressure when removing the pulse jet, it is structurally strong and there is no need to fix the reinforcing resin plate. The manufacturing cost can be reduced, and the surface area of the filter can be increased by the amount of no resin plate.

According to the means described in the above (2), since the folds of the filter formed continuously in the horizontal direction are each formed in a regular octagonal cross section and the lengths of the sides are equal, the filtering time (at the time of suction)
Because both sides receive the same surface pressure for both the external pressure and the internal pressure when removing the pulse jet, it is structurally strong and there is no need to fix the reinforcing resin plate. The manufacturing cost can be reduced, and the surface area of the filter can be increased by the amount of no resin plate.

According to the means described in the above (3), even if the shape of each fold of the filter is not formed into a regular hexagonal cross section or a regular octagonal cross section, the dimensional ratio in the vertical and horizontal directions can be strengthened. Forming a hexagonal cross section or octagonal cross section set within the range of 7 to 1.2 can provide a filter having excellent strength in combination with the special cross sectional shape of each fold. As in the above cases (1) and (2), the use of a reinforcing resin plate is omitted, so that a filter having a low manufacturing cost and a large filter area can be provided.

According to the means described in the above (4), by using a synthetic fiber such as polyester as a filter material, heat molding and joining can be facilitated and the production cost can be reduced, so that a filter suitable for mass-produced products can be obtained. To provide

According to the means described in (5) above, it is possible to provide a low-cost filter with a simple structure in which the venturi is integrally fixed to each fold of the filter, and the venturi is made of synthetic resin. By being integrally fixed, the same reinforcing effect as that of the conventional product in which the resin plate is fixed to the mouth of the filter is exhibited, and it is possible to provide a flat filter that is strong against both external pressure and internal pressure.

As described above, the technical problems described above can be solved by the above-described means, and the problems of the conventional technology can be solved.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the above-mentioned flat filter for a dust collector according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view in which a part of a flat filter for a dust collector according to the present invention is omitted, FIG. 2 (A) is a front view thereof, and FIG. 1 (B) is a sectional view taken along line AA of FIG. Sectional view along FIG. 3
1 is an enlarged sectional view taken along the line BB in FIG. 2A. In these drawings, reference numeral 1 denotes a flat filter according to the present invention, and 1F... A large number of folds are formed continuously in the horizontal direction, 2 is a surface plate of the venturi 3 attached to the mouth portion of the filter 1, 3H is a suction hole of the venturi 3, and clean air filtered by the filter 1 is used for filtration when filtering. 3H, the air is sucked into the clean room (not shown), and when the pulse jet is blown off, compressed air is blown into each of the folds 1F through the suction holes 3H to remove dust adhering to the surface of each of the folds 1F. It is a mechanism to pay off.

The venturi 3 has side plates 3 which are bent inward on both sides as shown in an enlarged sectional view shown in FIG.
a, 3a are continuously provided, and inside the side plates 3a, 3a, the leading edge 1F of each fold 1F constituting the filter 1 is provided.
a, and the front edge 1Fa of the fold 1F is integrally joined to the venturi 3 side by molding by pouring the synthetic resin 4 into the inside of the both side plates 3a, 3a. It is configured to fix the venturi 3.

Each fold 1F of the above-mentioned flat filter 1
Is formed in a regular hexagon 1F as shown in FIG. 2 (b) and FIG. 5 (a), or a regular octagon as shown by reference numeral 1F ′ in FIG. 5 (b). However, the vertical to horizontal dimension ratio y / x of each fold 1F or 1F '(see FIG. 5)
Is formed in a hexagonal or octagonal cross-section set within the range of 0.7 to 1.2, the same strength as when the cross-section is formed in a regular hexagonal or regular octagonal shape can be obtained.

FIG. 4 shows a fold 1 having a regular hexagonal cross section according to the present invention.
The process for manufacturing the flat filter 1 having the F is described. As the filter material FT, for example, a synthetic fiber such as polyester or a material based on these chemical fibers is used. The FT is heated by heaters 5 and 5 as shown in FIG. 4A, and then the heated filter material FT is pressed by presses 6 and 6 as shown in FIG. As shown in FIG. 5A, a filter molding material FX in which a convex portion having a substantially mountain-shaped cross section is repeatedly formed in the longitudinal direction is formed, and the two filter molding materials FX formed in this manner are formed as shown in FIG. By joining with a hot press, an adhesive, or a hot melt, a fold 1 having a regular hexagonal cross section as shown in FIG.
The flat filter 1 in which a large number of F ... are continuously formed in the lateral direction can be manufactured.

When polyester is used as the filter material FT, a regular fiber of polyester (melting point of about 240 ° C.) and a low-melting fiber (melting point of about 160 ° C.) of about 40 to 50 mm in length are used. Each of these fibers is mixed, and a plate-shaped filter material FT having a thickness of about 6 mm is formed by a needle punch using the filter material FT in the procedure shown in FIG. 4 using the filter material FT. Is molded.

In order to form the fold 1F 'having a regular octagonal cross section shown in FIG. 5B, a filter material FY having a convex portion having a substantially umbrella cross section in the longitudinal direction formed repeatedly by the above-described method is used. The regular hexagonal or regular octagonal folds 1F, 1F 'formed in this manner have uniform lengths on each side and can be deformed to both external pressure and internal pressure. Excellent strength can be exhibited.

FIG. 6 shows (a), (b), (c),
(D) and (e) are tables showing the relationship between the surface area and the pressure resistance (strength) of each of the folds of the flat type, the fillet type, the cylindrical type, the regular hexagonal form, and the regular octagonal form shown in (e), respectively. As is clear from FIG. 1, the regular hexagonal and regular octagonal folds 1F, 1F '
Has a large surface area (filter area) and strong strength.

The flat filter for a dust collector according to the present invention is configured as described above, and each fold 1F... Or 1F ′... Of the flat filter 1 is formed in a regular hexagonal or regular octagonal cross section, respectively. Is formed in a hexagonal or octagonal cross-section in which the vertical and horizontal dimensional ratios of these folds 1F and 1F 'are set within the range of y / x = 0.7 to 1.2. Since the external pressure and the internal pressure applied to each of the folds 1F and 1F 'when the pulse jet is removed are applied to each side (each surface) in the same or almost the same state, each of the folds 1F and 1F is applied.
F 'is not deformed by the external pressure and the internal pressure. Therefore, the problem that the flat filter 1 is bent by the external pressure and the internal pressure can be solved.

[0031]

According to the flat filter for a dust collector according to the present invention, it is not necessary to fix a resin plate for preventing bending to the flat filter. Therefore, the manufacturing cost can be reduced by that much, and It can exhibit the advantage of increasing the dust collection efficiency by increasing the filter area, and by using chemical fibers as the filter material, heat molding and joining are facilitated to further reduce the manufacturing cost, and Combined with the fact that the venturi is integrally fixed to the mouth of each fold and the structure has been simplified and the cost has been reduced, it is extremely useful and revolutionary as a flat filter suitable for mass production. is there.

[Brief description of the drawings]

FIG. 1 is a side view in which a part of a flat filter for a dust collector according to the present invention is omitted.

FIG. 2A is a front view of the filter shown in FIG. 1,
(B) is a sectional view taken along the line AA in FIG. 1.

FIG. 3 is an enlarged cross-sectional view taken along line BB in FIG.

FIGS. 4 (a), 4 (b), and 4 (c) are process diagrams sequentially explaining a procedure for forming a filter material.

FIGS. 5 (a) and 5 (b) are enlarged views of the shape of each fold of the flat filter for a dust collector according to the present invention.

FIG. 6 is a table showing a relationship between each shape of a fold of a flat filter and a withstand voltage.

7 (a), (b), (c), (d), and (e) are configuration diagrams specifically illustrating each shape of the folds of the filter shown in the table of FIG.

FIG. 8A is a front view of a conventional flat filter.
(B) is a side view thereof.

FIG. 9 is a configuration diagram illustrating a state of an external pressure applied to a fold having a cross section of a conventional flat filter.

10A is a configuration diagram illustrating a deformed state of a fold due to an external pressure, and FIG. 10B is a configuration diagram illustrating a deformed state of a fold due to an internal pressure.

FIG. 11 is a diagram showing a difference between loads received by a filter of a general dust collector.

FIG. 12 is a configuration diagram illustrating the shape of a fold of a conventional flat filter having a circular cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Plate-shaped filter 1F, 1F 'fold 3 Venturi 4 Synthetic resin 5 Heater 6 Press FT Filter material FX, FY Filter molding material y Vertical dimension of fold x Horizontal dimension of fold

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-8-33823 (JP, A) JP-A-5-277321 (JP, A) JP-A-1-245819 (JP, A) JP-A-58-1983 196820 (JP, A) JP-A-61-192320 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 46/00-46/54

Claims (5)

(57) [Claims] 1. A method according to claim 1, wherein each of the transversely extending folds is formed to have a regular hexagonal cross section by joining two filter molding materials in which a convex portion having a substantially mountain-shaped cross section is repeatedly formed in a longitudinal direction. Flat filter for dust collector. 2. A method according to claim 1, wherein two folds formed in a transverse direction are each formed into a regular octagon by joining two filter molding materials having a convex portion having a substantially umbrella-shaped cross section in a longitudinal direction. Filter for dust collectors. 3. A fold ratio between longitudinal and lateral folds, which is obtained by joining two filter molding materials having a convex portion having a substantially mountain-shaped or substantially umbrella-shaped cross section in the longitudinal direction. Characterized in that it has a hexagonal cross section or an octagonal cross section within a range of 0.7 to 1.2. 4. Using a synthetic fiber such as polyester or a material based on such a synthetic fiber as a filter material, heating the filter material and forming it with a press, and then hot-pressing the two filter forming materials. Press or adhesive,
The flat filter for a dust collector according to claim 1, 2 or 3, wherein the flat filter is formed by joining with a hot melt or the like. 5. The mouth portion of each fold continuous in the lateral direction,
4. A pulse jet injection venturi is integrally fixed using a synthetic resin.
A flat filter for a dust collector according to the above.