JP2011161429A - Bag type air filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bag type filter which prevents a glass fiber from being stripped by air flow and prolongs the product life of a filter medium by preventing the glass fiber sheet as a base material of the filter medium from directly contacting with the air flow. <P>SOLUTION: The bag type air filter is prepared by sticking each of reinforcing sheets 3, 3' on both sides of the upstream side and downstream side respectively to the air flow of the filter medium sheet made from the glass fiber and sticking the bag type filter medium 1, which is made to a bag by piling up the two sheets, inserting other side edges into a covering cloth except one side edge and further sewing up them with yarn over the covering cloth, on an outer peripheral frame 11 with an adhesive or double-sided tape 12 so as to be fixed and held. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bag-type air filter used as a pre-filter or a medium-high performance filter for factory air-conditioning, building air-conditioning or gas turbine intake.

  Conventional bag-type air filters are used in a fixed type in which a plurality of bag-like filter media are attached to an attachment frame with an adhesive, and in a removable type in which a bag-like filter media is detachably attached to an attachment frame.

  Conventionally, two glass fiber filter media sheets with a reinforcing sheet bonded to one side are overlapped, and the other side edge except for one side edge is sandwiched with a covering cloth and sewn with a thread from above the covering cloth. A bag-shaped air filter is formed by fixing the bag-shaped filter medium in the form of a bag to the mounting frame with an adhesive, or detachably mounted without using an adhesive.

  Therefore, since the glass fiber of the bag-shaped filter medium that holds dust is exposed on the upstream side of the airflow, especially in the vicinity of the opening of the frame mounting portion that functions as a gas inlet, drift, turbulence, etc. The glass fibers are peeled off by the air flow, and only the reinforcing sheet on the downstream side of the bag-like filter medium is formed, and the bag-like filter medium that plays a role in holding dust can no longer play a role.

  For this reason, the collection efficiency is remarkably deteriorated, the performance of the bag-type air filter is lowered, and the life is shortened, resulting in an increase in cost.

Problems to be solved by the invention

  The present invention is intended to solve the above-described problems. First, the object of the present invention is to prevent the glass fiber filter material sheet, which is the base material of the bag-shaped filter media, from being exposed to the airflow. It is.

  Next, an object of the present invention is to prevent the glass fibers from being peeled off by an air flow such as a drift current or a turbulent flow and being carried downstream.

  Moreover, the objective of this invention is attached so that the lifetime of the bag-shaped filter medium which bears dust holding | maintenance may become a long lifetime.

Means for solving the problem

  According to a first aspect of the present invention, a bag-type air filter is composed of a bag-shaped filter medium, a lattice-shaped inner frame that supports and fixes the bag-shaped filter medium, and a lattice-shaped outer frame that fits into the lattice-shaped inner frame. It is characterized by.

  The second solving means of the present invention is characterized in that the frame attachment portion of the bag-shaped filter medium is applied and fixedly held on the outer peripheral frame of the lattice-shaped inner frame.

  The third solving means of the present invention is characterized in that the frame attachment portion of the bag-like filter medium is detachably attached to the outer peripheral frame of the lattice-like inner frame.

  The fourth solution of the present invention is characterized in that the bag-shaped filter medium is composed of two glass fiber filter sheets, a reinforcing sheet, a covering cloth, and a reinforcing cloth.

  The fifth solution of the present invention is that the reinforcing sheets are bonded to both the upstream side and the downstream side with respect to the airflow of the glass fiber filter material sheet, and the two sheets are overlapped to remove one side edge and to the other. The side edge portion is sandwiched between covering cloths and further stitched with a thread from the covering cloth to form a bag.

  The sixth solving means of the present invention is characterized in that the opening edge of the frame mounting portion of the bag-shaped filter media is sewn together with a reinforcing cloth with a thread, and a plurality of bag-shaped filter media are connected and sewn. is there.

  Here, the bag-shaped filter medium used in the present invention includes, for example, a glass mat, a synthetic fiber nonwoven fabric, a laminate of ultrafine fibers and a glass mat by a melt blow method, a blended product, or a laminate of ultrafine fibers and a synthetic fiber nonwoven fabric. , Blended products can be used.

In addition, the density of the filter medium is not particularly limited and can be used as it is as a bag-shaped filter medium. Generally, it is 50-370 g / m < ² >, and 60-200 g / m < ² > is still better among them.
The thickness of the filter medium is not particularly limited as long as it has been used as a conventional bag-shaped filter medium. Generally, it is 5-20 mm, and 5-10 mm is still better among them.

  And the width | variety of a covering cloth is preferable so that the side edge part of a filter medium may not be loosened, and may become the obstacle to the flow of airflow. Furthermore, when a synthetic fiber nonwoven fabric is used for the bag-shaped filter medium, it is possible to perform heat welding instead of sewing.

  Next, the grid-like inner frame is composed of a grid bar and an outer peripheral frame, which is one less than the number of bag-shaped filter media, and both the grid bar and the outer peripheral frame are convex, U-shaped or rectangular frames. Yes. Then, when the adhesive is applied to the entire circumference of the side surface of the outer peripheral frame, and the lattice-shaped inner frame is fitted into the bag-shaped filter medium from the downstream side of the airflow, the upper surface of the lattice-shaped inner frame is the bag-shaped filter medium. The frame attachment portion and the reinforcing cloth are sandwiched and held firmly.

    In addition, when double-sided tape is attached to the entire circumference of the side surface of the outer peripheral frame and the lattice-shaped inner frame is fitted into the bag-shaped filter medium, the upper surface of the lattice-shaped inner frame is attached to the frame attachment portion and the reinforcing cloth of the bag-shaped filter medium. It is designed to be detachably fixed.

  Here, the shape of the lattice-shaped inner frame is a convex portion, a U-shape or a rectangular shape. However, the shape of the lattice-shaped inner frame is not limited to this. As long as it is formed so as to contact the frame mounting portion of the filter medium and the reinforcing cloth, the gist of the present invention is not changed at all even if various changes are made. Further, the bag-shaped filter medium may be fixedly held with an adhesive on an integral mounting frame having a plurality of openings.

  The effect | action by the said problem-solving means is as follows. That is, the reinforcing sheets are bonded to both the upstream and downstream sides of the air flow of the two glass fiber filter sheet sheets, and the sheets are overlapped to cover one side edge and the other side edge part with a cloth. Next, sew with a thread from the top of the covering cloth to form a bag, and then hold the reinforcing cloth on the frame attachment part of the bag-like filter media firmly to the outer peripheral frame of the lattice-shaped inner frame with an adhesive, Since the structure is made by folding and reinforcing the double-sided tape on the side surface of the outer peripheral frame of the frame, the glass fiber filter medium sheet of the bag-shaped filter medium will not be exposed to the airflow, so upstream It is possible to prevent the glass fibers from being peeled off by an air current such as strong drift or turbulent flow from the side and being carried downstream by the air current.

  In addition, the bag-shaped filter medium is swelled by the airflow that flows into the opening of the bag-shaped filter medium. In addition to being prevented, the effective filtration area during ventilation can be prevented from being reduced.

  Further, the frame attachment portion of the filter medium is not detached due to an external force due to a strong air flow pressure fluctuation, vibration or turbulence from the upstream side.

The invention's effect

As described above, the bag-type air filter of the present invention has the following effects.
(1) Since it has the structure of a bag-like filter medium in which reinforcing sheets are bonded to both the upstream side and the downstream side with respect to the air flow of two glass fiber filter medium sheets, the glass fiber filter medium sheet becomes an air stream. On the other hand, the glass fiber is not exposed, and the glass fiber is peeled off by an air current such as a strong drift or turbulent flow from the upstream side and can be prevented from being carried downstream by the air current.
(2) Since the bag-shaped filter medium swells uniformly when the airflow is ventilated and the filtration surface can be used effectively, maximum dust retention is possible.
(3) Since the dust holding performance of the bag-shaped filter medium is improved, the life is extended, and as a result, the cost is reduced.

It is the whole figure which assembled the bag type air filter. It is a perspective view of a bag-shaped filter medium. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. It is a disassembled perspective view of the bag type air filter of the present invention. It is a figure which shows the state which affixed and fixed the frame attachment part and reinforcement cloth of the bag-shaped filter media to the lattice-shaped inner frame with the adhesive agent or the double-sided tape.

Hereinafter, a bag type air filter concerning an embodiment of the present invention is explained based on an accompanying drawing.
(First embodiment)
1st Embodiment demonstrates the fixed type which attached the bag-shaped filter medium to the attachment frame with the adhesive agent.

  1 is a bag-like filter medium made of glass fibers, and two rectangular glass fiber filter medium sheets 2 and 2 'are bonded to reinforcing sheets 3 and 3', respectively. Sheets 2 and 2 'are overlapped, and one side edge is removed, the other side edge is sandwiched between covering cloths 4, and the covering cloth 4 is sewn with a thread to form a bag.

  Further, one side edge is a frame attachment portion 5 in which an opening having a function of a gas inlet is formed, and a reinforcing cloth 6 is sewn to the frame attachment portion 5. Further, the adjacent frame attaching portions 5 are sewn together with a reinforcing cloth 6 with a thread, and a plurality of bag-shaped filter media 1 are connected and sewn. Further, the bag-shaped filter medium 1 is provided with a long suture line 7 and a short suture line 8.

  Next, reference numeral 9 denotes a lattice-shaped inner frame comprising a lattice bar 10 and an outer peripheral frame 11. The grid bars 10 and the outer peripheral frame 11 are convex, U-shaped or rectangular. Further, an adhesive 12 is affixed to the entire circumference of the side surface of the outer peripheral frame 11. The frame attaching portion 5 and the reinforcing cloth 6 are held by being folded back in the lateral direction of the outer peripheral frame 11 of the lattice-like inner frame 9 and being attached to the adhesive 12 with the frame attaching portion 5 and the reinforcing cloth 6.

  Next, the lattice-shaped outer frame 13 includes a lattice beam 14 and an outer peripheral frame 15 formed at positions corresponding to the lattice beam 10 and the outer peripheral frame 11 of the lattice-shaped inner frame 9. The grid bar 14 and the outer peripheral frame 15 are recessed.

Further, two claws 16 are integrally formed on both side surfaces of the outer peripheral frame 15 of the lattice-shaped outer frame 13. Then, the claws 16 of the grid-like outer frame 13 are pressed against the outer surface of the grid-like inner frame 9 with the grid-like outer frame 13 fitted to the grid-like inner frame 9. Thereby, the lattice-shaped inner frame 9 and the lattice-shaped outer frame 13 are securely adhered and fixed to form a bag-type air filter.

(Second Embodiment)
In the second embodiment, instead of the adhesive applied to the attachment frame, a double-sided tape is attached to make the frame attachment portion 5 of the bag-shaped filter medium detachable. Since it is almost the same as the first embodiment, a detailed description thereof will be omitted.

  In the above-described embodiment, only one example is described, and the gist of the present invention is not changed at all by various changes. For example, the claw 16 of the grid-like outer frame 13 is formed integrally with the grid-like outer frame 13, but it is also possible to attach a claw 16 of another part to the grid-like outer frame 13. Further, the double-sided tape or adhesive may be any one having a function of holding the bag-shaped filter medium 1 on the lattice-shaped inner frame 9. Further, the bag-shaped filter medium may be fixedly held by an adhesive on an integral mounting frame having a plurality of openings.

    The present invention is a bag-type air filter for air cleaning used for outside air intake and air conditioning in factories, buildings, gas turbine plants, etc., and only sticks reinforcing sheets to both sides of two glass fiber filter media sheets. Since the frame attachment part of the bag-shaped filter media can be securely attached by a simple method, it is extremely practical to prevent the glass fibers from being peeled off and damaged by air flow such as drift or turbulent flow. It is.

DESCRIPTION OF SYMBOLS 1 ... Bag-shaped filter media 2, 2 '... Glass fiber filter media sheet 3, 3' ... Reinforcement sheet 4 ... Cover cloth 5 ... Frame attachment part 6 ... Reinforcement cloth 9. ..Lattice-like inner frame 10 ... Lattice crosspiece 11 ... Outer peripheral frame 12 ... Adhesive or double-sided tape 13 ... Lattice-like outer frame 14 ... Lattice crosspiece 15 ... Outer peripheral frame

Claims (3)

  A bag-like filter medium comprising two glass fiber filter sheets, a reinforcing sheet, a covering cloth and a reinforcing cloth is fixedly held to the outer peripheral frame of the grid inner frame with an adhesive, or the outer peripheral frame of the grid inner frame A bag-type air filter characterized by being attached so as to be detachably attached to the bag.   A bag-shaped filter media is made by stacking two glass fiber filter media sheets each bonded with a reinforcing sheet on both sides, and covering the other side edge with a covering cloth except for one side edge. The bag-type air filter according to claim 1, wherein the bag-type air filter is stitched into a bag shape.   2. The bag-type air filter according to claim 1, wherein one side edge of the bag-shaped filter medium is integrated by stitching a reinforcing cloth on a glass fiber filter sheet having a reinforcing sheet bonded to each side. .

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