JP3143879B2 - Foldable filter unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable filter unit for collecting dust mainly on the surface of a filter.

[0002]

2. Description of the Related Art Conventionally, a dust collecting filter has a mechanism for collecting the filter surface and a mechanism for collecting the entire filter layer.

[0003] Generally, as a filter for air purification in practical use, a filter is fitted in a case having a limited volume, and its collection performance is related to the ventilation resistance and the area of the filter. It is required that one filter can collect as much dust as possible. Therefore, the filter medium is folded into a pleated shape to increase the filter surface area, reduce the airflow resistance, and increase the dust collection amount.

[0004] Dusts vary in size from large to small. Filtering particles of the order of submicron requires a filter composed of fibers of the order of 1 micron having high airflow resistance. Therefore, when a filter of 1 micron order is folded in a pleated shape to increase the filter surface area, and the pleated folded filter material is used in a case, the filter filter can withstand wind pressure due to airflow resistance, mechanical vibration and other factors. Shape strength is required.

Regarding the strength of a filter medium used for a foldable filter, the mechanical strength is generally weak. To solve this problem, techniques such as adding a strength reinforcing material and increasing the thickness of the filter medium have been used.

[0006] In order to obtain airtightness between the filter medium and the casing of the conventional folding filter, the filter is manufactured by a very complicated process due to the characteristics of the filter medium.

[0007]

The method of adding a strength reinforcing material and increasing the thickness of the filter medium used for the filter medium used in the above-mentioned conventional foldable filter, increases the strength but decreases the trapping performance and the airflow resistance. This leads to an increase in the size, the size of the shape, and the cost, and negative conditions increase. The present invention is intended to impart the strength of a filter to the shape of a casing without applying a method of increasing strength to a filter medium.

As described above, in the conventional folding filter, in order to obtain good airtightness, the joining between the filter medium and the casing is performed in a very complicated manner because the folds of the filter medium are very complicated. It is performed with an adhesive such as silicon or hot melt. The present invention is intended to eliminate this bonding step and to perform a simple and simple process.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a synthetic resin casing formed by fitting up and down, and having a comb-like projection formed thereon. Both ends of the ridge of the filter material are sandwiched, and the middle is partially or entirely supported by the bridge support from the apex of the protrusion, and the casing is provided with a protrusion for airtightness and a groove for mating with the protrusion. It is a foldable filter unit with its surroundings held at a required pressure.

[0010] An upper comb tooth-shaped projection is provided at a required interval on the connecting surface outside the filter hole of the upper casing, with the filter hole therebetween, facing each other, and opening to the connecting surface and the inner diameter surface of the filter hole. The lower comb-shaped projections, which are formed in a row and are opposed to each other with the filter holes interposed between the filter holes of the lower casing and open to the connection surfaces and the inner diameter surface of the filter holes, are required. Formed in rows at intervals, in one or both of the upper casing or lower casing,
An intermediate comb-like projection that crosses the filter hole is provided, and on the connecting surface of the upper casing and the lower casing, including the upper comb-like projection and the lower comb-like projection, the airtight projection and the airtight projection that mesh with each other are used. It may be a folding type filter unit formed with a groove.

[0011] An upper comb tooth-shaped projection is provided at a required interval on the connecting surface outside the filter hole of the upper casing, with the filter hole interposed therebetween and facing each other, and opening to the connecting surface and the inner diameter surface of the filter hole. The lower comb-shaped projections, which are formed in a row and are opposed to each other with the filter holes interposed between the filter holes of the lower casing and open to the connection surfaces and the inner diameter surface of the filter holes, are required. Formed in rows at intervals, in one or both of the upper casing or lower casing,
An airtight seal is formed by bridging a bridging support that crosses the filter hole over the lower comb tooth-shaped projection, and includes the upper comb tooth-shaped projection and the lower comb tooth-shaped projection on the connecting surface of the upper casing and the lower casing. It is good also as a folding type filter unit which forms the projection muscle for use and the groove for airtightness.

[0012] The bridge support may be formed as a cantilever bridge support on one or both of the upper comb-like projection and the lower comb-like protrusion.

The intermediate comb-shaped projection may be provided with a cantilever-type bridge support or a bridge-type bridge support.

The intermediate comb-like projections or the bridge support portions in the casing and the lower casing may correspond to the same position or may be mutually inconsistent.

[0015]

The folding filter unit according to the present invention comprises:
Since it is configured as described above, it supports the folded portion of the filter medium and acts as a spacer, so that the filter medium has a sufficient strength as a whole.

Further, the hermetic protrusion and the groove for mating with the hermetic seal make the air-tightness characteristic flat from the conventional point, thereby obtaining more reliable air-tightness.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a folding filter unit 1 of the present invention will be described with reference to FIGS. 1 and 2 showing a first embodiment. A casing 10 comprises an upper casing 11 and a lower casing 12 from the top of the drawing. On the connecting surface 13a outside the filter hole 13 of the upper casing 11,
The filter holes 13 are opposed to each other, and
a and upper comb-shaped projections 14, 14... opening on the inner surface of the filter hole 13 are formed in a row at a required interval, and a connecting surface 15a outside the filter hole 15 of the lower casing 12 is formed.
In the same manner, lower comb teeth-like projections 16, 16,... Which face each other and open to the connecting surface 15a and the inner diameter surface of the filter hole 15 are formed in a row at required intervals. Lower comb-shaped projections 16, 1 of casing 12
6, a bridging support portion 17 crossing the filter hole 15 is formed, and an airtight protruding muscle receiving groove 19 including the upper comb tooth-shaped protrusions 14, 14 is formed on the connecting surface 13 a of the upper casing 11. On the connecting surface 15a of the lower casing 12,
Airtight protruding muscle 1 including lower comb tooth-shaped protruding portions 16, 16
8 is formed.

The upper comb-shaped protrusion 14 of the upper casing 11 is composed of an upper comb-shaped protrusion 14a and an upper comb-shaped groove 14b, and the lower comb-shaped protrusion 16 of the lower casing 12 is similarly formed. It is composed of a lower comb-shaped projection 16a and a lower comb-shaped groove 16b. The upper comb-shaped projections 14 of the upper casing 11 and the lower comb-shaped projections 16 of the lower casing 12 mesh with each other to support the folded circular filter medium 20, and the connecting surface 13a of the upper casing 11 and the upper comb-shaped teeth. Projection 14
And the lower casing 1
The folded circular filter medium 20 is hermetically sandwiched between the second connecting surface 15a and the hermetic projections 18 of the lower comb tooth-shaped projection 16, and the gas passing through the filter holes 13, 15 is filtered.

Next, a second embodiment will be described with reference to FIGS. 3 to 9. The casing 21 is composed of an upper casing 22 and a lower casing 23 from the top of the drawing. 13a, the upper comb tooth-shaped protrusion 14, the filter hole 15 of the lower casing 23, the connecting surface 15a, and the lower comb tooth-shaped protrusion 16 are formed in the same manner as in the first embodiment. An airtight projection muscle receiving groove 19 is formed in the upper comb tooth-shaped projections 14, 14, and the connection surface 1 of the lower casing 23 is formed.
The same applies to the formation of the airtight projection streaks 18 in the lower comb-shaped projection 16 in 5a.

The upper comb-shaped protrusion 14 of the upper casing 22 is composed of an upper comb-shaped protrusion 14a and an upper comb-shaped groove 14b, as in the first embodiment. 16 also comprises a lower comb tooth-like projection 16a and a lower comb tooth-like groove 16b. The same applies to the case where the bridging support portion 17 traversing the filter hole 15 is formed so as to extend over the lower comb-like projections 16, 16 of the lower casing 23.

In FIGS. 3 to 9 of the second embodiment, in the upper casing 22 and the lower casing 23, the intermediate comb-like projection 2 traversing the filter holes 13 and 15 is shown.
4 is provided, which is composed of an intermediate comb tooth-like projection 24a and an intermediate comb tooth-like groove 24b. The lower casing 23 is integrally connected to the bridging support 17 at the upper end of the comb tooth-like projection 24a. Support.

The distinction between the upper casings 11, 22 and the lower casings 12, 23 is a division for explanation.
It does not specify the attachment position or the arrangement position.

The airtight projection 18 is provided on the lower casing 12,
23, the airtight protruding muscle receiving groove 19 is provided on the upper casing 1.
It is not intended to be limited to 1, 22.

As for the bridging support 17, the bridging support 17 may be provided on the upper comb-like projections 14 of the upper casings 11, 22. It is not necessary to provide the bridging support portions 17 on all of the upper comb-shaped projections 14 and the lower comb-shaped projections 16, but they may be provided every other or every other place.

As shown in FIG. 10, the bridging support portion 17 includes an upper comb-shaped protrusion 14 and a lower comb-shaped protrusion 16.
Even if the cantilevered bridge support portion 17a is formed on the middle, as shown in FIG.
7b may be formed, and as shown in FIG. 12, a bridging support 17c may be formed.

The upper casings 11, 22 and the lower casings 12, 23 may correspond to the same position or may be mutually inconsistent.

Since the embodiment of the present invention is constructed as described above, it is folded, for example, a folded circular filter medium which is drawn out in a circular shape is sandwiched between the upper casing and the lower casing. It is sandwiched between the upper comb tooth-shaped protrusion and the lower comb tooth-shaped protrusion of the lower casing.

The airtightness of the filter is determined by the airtight projections of the upper casing surrounding the upper comb teeth and the airtight projections of the lower casing surrounding the lower comb teeth of the lower casing. To obtain airtightness. Also, at this time, since the folded circular filter medium is reinforced by the bridging support portion connecting the left and right vertices of the lower comb-shaped protrusion, and the shape is maintained, the filter medium itself does not require strength.

[0029]

As described above, the present invention has the following major advantages. (1) The airtightness of the folding filter is easily and reliably obtained. (2) The shape of the foldable filter can be maintained without the filter having excessive strength.

[Brief description of the drawings]

FIG. 1 is a partially omitted assembly cross-sectional view showing a first embodiment of the folding filter unit of the present invention.

FIG. 2 is an exploded perspective view of the disassembled parts.

FIG. 3 is a partially omitted assembly cross-sectional view showing a second embodiment of the present invention.

FIG. 4 is a connection inner view of the upper casing of the second embodiment.

FIG. 5 is a cross-sectional end view taken along the line AA of FIG. 4;

FIG. 6 is a cross-sectional end view taken along the line BB of FIG. 4;

FIG. 7 is a connection inner view of the lower casing of the second embodiment.

FIG. 8 is a cross-sectional end view taken along line CC of FIG. 7;

9 is a cross-sectional end view taken along line DD of FIG. 7;

FIG. 10 is a partial side view showing another embodiment in which a cantilever-type bridging support portion is provided on an upper comb-like projection or a lower comb-like projection.

FIG. 11 is a partial side view showing another embodiment in which a cantilever-type bridging support is provided on an intermediate comb-like projection.

FIG. 12 is a partial side view showing another embodiment in which a bridge type bridging support portion is provided on an intermediate comb-like projection.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foldable filter unit 10 Casing 11 Upper casing 12 Lower casing 13 Filter hole 13a Connecting surface 14 Upper comb-shaped protrusion 14a Upper comb-shaped protrusion 14b Upper comb-shaped groove 15 Filter hole 15a Connecting surface 16 Lower comb-shaped protrusion Part 16a Lower comb tooth-like projection 16b Lower comb tooth-like groove 17 Bridge supporting part 18 Hermetic projection muscle 19 Airtight projection muscle receiving groove muscle 20 Folding circular filter medium 21 Casing 22 Upper casing 23 Lower casing 24 Intermediate comb tooth projection 24a Intermediate comb teeth 24b Intermediate comb teeth groove

Claims (6)

(57) [Claims] 1. A synthetic resin casing formed by fitting up and down, a comb-like projection adjacent to the inside of each side wall, and a part or the whole of one or both top and bottom apexes of the upper and lower projections are bridged. The structure is such that it meshes with the upper and lower casings, the filter is shaped by the bridge support and the comb tooth projections, and the filter is airtight. In the, a continuous airtight projection muscle is provided along the comb teeth,
A foldable filter unit in which the other casing is provided with a continuous groove along the comb teeth so as to mesh with the protrusion. 2. A synthetic resin casing formed by upper and lower fitting, comprising an upper casing and a lower casing. The casing is opposed to a connecting surface of the upper casing outside the filter hole with the filter hole therebetween. In addition, upper comb tooth-shaped projections that open to the connection surface and the inner diameter surface of the filter hole are formed in rows at a required interval, and the filter holes are interposed between the filter surface of the lower casing and the filter holes outside. Lower comb teeth protruding portions facing each other and opening to the connection surface and the inner diameter surface of the filter hole are formed in rows at a required interval, and intermediate comb teeth crossing the filter hole in one or both of the upper casing and the lower casing. Protrusions are provided, on the connecting surface of the upper casing and the lower casing,
A foldable filter unit including an airtight protrusion and an airtight groove that mesh with each other, including an upper comb-like protrusion and a lower comb-like protrusion. 3. The synthetic resin casing formed by the upper and lower fittings comprises an upper casing and a lower casing, and is opposed to each other on a connecting surface outside the filter hole of the upper casing with the filter hole interposed therebetween. In addition, upper comb tooth-shaped projections that open to the connection surface and the inner diameter surface of the filter hole are formed in rows at required intervals, and the filter hole is interposed between the connection surfaces outside the filter hole of the lower casing. The lower comb teeth-shaped protrusions facing the connecting surface and opening on the inner diameter surface of the filter hole are formed in rows at required intervals, and in one or both of the upper casing and the lower casing,
A bridging support that traverses the filter hole is formed across the lower comb-shaped protrusion, and the upper and lower casings are interlocked with each other, including the upper comb-shaped protrusion and the lower comb-shaped protrusion. A foldable filter unit formed with airtight protrusions and airtight grooves. 4. The cantilevered bridge supporting part is formed on one or both of the upper and lower comb-shaped protruding parts in a cantilevered bridging part. Foldable filter unit. 5. A foldable filter unit according to claim 1, wherein said intermediate comb tooth-shaped projection is provided with a cantilever-type bridge support or a bridge-type bridge support. 6. The method according to claim 1, wherein the intermediate comb-shaped projections or the bridging support portions in the upper casing and the lower casing correspond to the same position or are mutually inconsistent.
The foldable filter unit according to claim 3, 4 or 5.