JP3079091U - Dust filter for air conditioning - Google Patents

Abstract

(57) [Problem] To provide an inexpensive replaceable dust filter. SOLUTION: The outer frame 6 has a width W of 20 mm so that it can be easily replaced with a cleaning / regeneration type dust panel type filter. Using a filter cloth 4 in which a wire mesh 5 made of aluminum is adhered to one surface of the filter cloth 4, the radius of curvature R of the folding is determined so as to provide a minimum distance L at which the filter cloths do not come into contact with each other.
Is folded to 15 mm or less and adhered to the inner periphery of the outer frame to maximize the filtration area and extend the life.

Description

[Detailed description of the invention] [Technical field to which the invention belongs]

 The present invention relates to extending the replacement cycle of filters for air conditioning in buildings and general industries.

[0001]

[Prior art]

 In building and general industrial air-conditioning filter systems, a main filter is installed after the coarse dust filter for the dirty air, and the purified air after filtration is transported by a blower. For simple filtration such as taking in outside air, the main filter may not be provided. Generally, the dust filter is a washing / regenerating panel type filter that is filtered on a flat surface, a replaceable filter cloth type folding filter, a roll-up type roll filter, etc. Many types of panel-type filters are used.

A generally used panel filter has a size of 610 mm □, a thickness of 20 mm or less, and a filter cloth having a processing air volume of about 50 m ³ / min. Polyester fibers of about 80% are often used. When the pressure drop reaches about 5 to 15 mmAq, it is replaced, washed and regenerated, and its cycle varies depending on the place of use, but it is a short cycle within 1 to 3 months. As a long life filter to extend the replacement cycle of the dust filter, an exchangeable foldable filter with an increased filtration area is commercially available, but a filter cloth with a fold pitch of 20 mm or more is used. The filtration area of the washing and regeneration type is 610 mm. The plane area of the size is 0.36 m ^2, whereas the filtration area of the filter of 25 mm width is 0. The filter area is 83 m ^2, and the filtration area is about twice as large as the one-month cleaning and regeneration cycle, and the replacement cycle is every 3 to 4 months. In order to further increase the filtration area of the exchangeable folding filter, a wide filter must be used, and the wide remodeling has resulted in higher costs. In addition, since the roll filter handles a roll-shaped filter cloth, a large installation space is required, and it is difficult to replace the roll.

[0003] The main filter installed after the coarse dust filter is a medium-performance or high-performance filter using a finer filter cloth, or an electric dust filter or a deodorizing filter. It is extended as the collection efficiency of the previous dust filter is higher. Since the collection efficiency of a panel filter of a generally used dust filter is as low as about 60 to 80% by the gravimetric method, the main filter can be replaced or cleaned and regenerated in about 6 months to 2 years. It has been done.

[0004]

[Problems to be solved by the invention]

 The present invention contributes to a reduction in maintenance costs by providing an exchange filter cloth type coarse dust filter that eliminates washing and regeneration work by extending the filter replacement cycle. Large buildings use more than 300-1000 cleaning and regeneration type dust filters, which require a large number of replacements and monthly washing and cleaning operations each month, and purify the polluted wastewater after washing and washing. It is often drained without being drained.

[0005] The coarse dust filter of the present invention provides an inexpensive and replaceable foldable filter that can be easily replaced with a cleaning and regeneration type panel filter. Generally, in order to reduce the cost of the replaceable folding filter, a method of saving material by increasing the folding pitch of the filter cloth is used.However, the filtering area is reduced, the replacement cycle is shortened, and the cost is high. It is a disadvantage that it is difficult to be done. Conversely, the present invention maximizes the filtration area and extends the replacement life, thereby eliminating the need for cleaning and regenerating work by supplying replacement filters that are less expensive than the repetitive cleaning work for cleaning and regenerating panel-type filters. It is intended to prevent wastewater pollution without reducing maintenance costs and investing a great deal of equipment in wastewater purification treatment.

Further, the collection efficiency of the washing / regenerating type dust filter is high because the dust which is not collected is sent to the subsequent main filter because it is composed of a low filter cloth of about 60 to 80% by weight. Since the replacement cycle is short because the load on the main filter of the price is increased, the coarse dust filter of the present invention uses a filter cloth with a high collection efficiency of about 80 to 95% by weight to capture the coarse dust filter. By increasing the collection efficiency, the load on the downstream main filter is reduced and the replacement cycle is extended to further reduce costs.

[0007]

[Means for Solving the Problems]

The present invention has the following configuration to achieve the above object. Many filtration plane area taken within the size of the coarse dust filters generally on the application that have various sizes are used size by is has a thickness in the 610 mm □ 20 mm is the exchange of short period be 03 6 m ² Cleaning work has been performed. To extend the replacement cycle of such a dust filter can be achieved by enlarging the filtration area.However, a roll filter or a conventional long life filter can fit within the narrow range of 20 mm in thickness of a panel type filter. A large space is needed.

[0008] The coarse dust filter of the present invention uses a filter cloth type replaceable foldable filter having almost the same specifications as the conventional coarse dust panel type filter, and folds the filter cloth to the maximum within a thickness of 20 mm to increase the filtration area. Then, the filtration area was set to 1.6 m ² , thereby increasing the filtration area of the conventional panel type filter 0.36 m ² to 4.4 times. Therefore, the cycle of the conventional exchange cleaning and regeneration can be extended to 4.4 times every about 1 to 3 months. The cost increase by folding the filter cloth to the maximum can be supplied at a lower price by extending the replacement cycle than the cost required for the number of times of the conventional replacement cleaning and regeneration, so that the replacement cleaning and regeneration type is not used.

In addition, the filter cloth of the folding filter according to the present invention is composed of a filter cloth having a collection efficiency of about 80 to 95% by weight using a mixed cotton, and about 200 g of a filter of 20 mm and 610 mm square. The collection efficiency of the conventional panel type dust filter is about 60-80% because of its collection efficiency, so the collection efficiency is increased, so the load on the downstream main filter is reduced and the replacement cycle is extended. So that you can contribute to

[0010]

[Embodiment of the invention]

 The replaceable foldable filter of the present invention provides a long-life replaceable foldable filter according to the size of the panel type filter so that it can be easily replaced with the conventional washing and regeneration type panel type filter. It is. Generally, the thickness of a panel-type filter is 20 mm and the size is 610 mm square. To expand the filtration area within this range, use a thin filter cloth and reduce the folding pitch to respond. Although the filter cloth can be made thinner, the efficiency of collecting dust becomes worse, and if the folding pitch is shortened, the filter cloths come into contact with each other to reduce the processing air volume.

[0011] The replaceable folding filter of the present invention reinforces the filter cloth surface by bonding a thin aluminum mesh to the single side of the filter cloth of 1.0 mm or less with an adhesive so as to prevent rust corrosion. Using a 610 mm wide filter cloth provided with a fold length = width of 20 mm, a fold radius of curvature is provided so that the wire of the wire mesh is not bent at an acute angle so as not to break, and the gap between the filter cloths is The structure is such that the filtration area is expanded to the maximum so that the processing air volume does not decrease due to contact. The folded filter cloth is fixed to the inside of the outer frame of high water-resistant paperboard using recycled paper of 20 mm width and 610 mm square. The front and rear sides are reinforced by crossing the paperboard that connects the outer frame to the filter cloth so that the opening of the filter cloth is minimized. The back surface of the crossboard is glued to the projections of the filter cloth with an adhesive so that the filter cloths do not come into contact with each other to form a lattice support structure.

In addition, the filter cloth is a non-woven cloth made of a mixture of cotton and synthetic fibers and has a collection efficiency of about 80 to 95% and is capable of removing particles of 1 μm or more. Make it higher to reduce the load on the main filter and extend the replacement cycle. A dust filter that can be easily replaced with a conventional panel filter using the above-mentioned dust filter, does not require inexpensive cleaning, and can extend the replacement cycle of the main filter to contribute to cost reduction. To provide.

[0013]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram showing a partial cross section of the filter of the present invention. In the air conditioning filter system for buildings and general industries, the dirty air 1 is purified after passing through the coarse dust filter 2 of the present invention and filtered to obtain the air 3. After that, a membrane filter will be installed at the later stage for further purification. Generally, the dust filter is a panel-type filter with 60-80% of water-recycling type, such as polyester fiber, which has a collection efficiency of about 100g when the size is 610mm □ and the width W is 20mm. They are often used and the replacement cycle is as short as about 1 to 3 months. The dust filter 2 according to the present invention provides a replaceable folding filter which can be easily replaced with the above-mentioned panel type filter and is not washed.

FIG. 2 is an enlarged view showing a cross section of the filter of the present invention. The size of the dust filter 2 of the present invention is the same as the size of the conventional panel type filter, and the filter cloth 4 is a nonwoven fabric of a mixture of cotton and synthetic fibers, the collection efficiency is about 80 to 95%, and the thickness t1 is 1.0 mm. To prevent rust corrosion on the back surface of the filter cloth 4 using the following filter cloth, a diamond-shaped wire mesh 5 made of aluminum having a width of 1.0 mm, a thickness t2 of 0.3 mm, and a side length of 30 mm and 18 mm was roller-rolled. Then, the surface of the filter cloth was reinforced with an adhesive to give a tension. There is also a method of welding the wire after assembling it in a grid shape, but the filter cloth swells between the grids and cannot be made flatter than the surface of the filter cloth 4 to which the diamond-shaped wire mesh 5 has been previously attached. In addition, the rhombus-shaped wire mesh 5 has higher rigidity than the lattice-like wire mesh.

Using a filter cloth 4 having a wire mesh 5 stretched on the back surface, a folding radius of curvature R3 mm with a folding length = width W of 20 mm is provided so that the wire of the wire mesh 5 is alternately folded so as not to be broken. The pitch P was 11 mm. In the method of folding at an acute angle without providing the folding radius of curvature R3 mm, the wire of the wire mesh 5 is broken. Therefore, the radius of curvature R is set to 6 times or more the thickness of the wire used. By setting the radius of curvature R to 3 mm, the distance L between the filter cloths 4 at the folded portion can be set to 0.5 to 1.0 mm. It is not preferable to fold the filter cloth 4 at an acute angle without providing the radius of curvature R because the distance L between the filter cloths 4 at the fold is not large and the dust collecting effect is greatly reduced. Also, in the method of assembling and welding wires in a grid, the surface of the filter cloth 4 is not flat, and if the radius of curvature R is 3 mm, the distance between the filter cloths 4 is small due to contact between the filter cloths 4 and the pitch P cannot be shortened.

The folded filter cloth 4 is fixed around the inside of a highly water-resistant paperboard outer frame 6 made of recycled paper having a width W of 20 mm, 610 mm and a thickness of 0.6 mm using an adhesive. On the front and rear surfaces, paperboards 7, 7 'connecting the outer frame 6 on the outer periphery are crossed to reinforce the opening of the filter cloth 4 at a minimum so as to be reinforced. The back surfaces of the crossing paperboards 7 and 7 'have a lattice support structure so that the projections 8 of the filter cloth are adhered by an adhesive, so that the distance between the filter cloths 4 does not change and the folding pitch P does not change. When the peak pitch P is 11 mm, the maximum filtration area of 1.6 m ² is obtained when the peak pitch P is 11 mm, which is 4.4 times larger than that of the conventional washing and regeneration type 0.36 m ² . Therefore, the replacement cycle can be extended. By providing the above-mentioned coarse dust filter 2, the conventional washing and regeneration type panel filter can be replaced without any need for improvement. In addition, the conventional foldable long life type filter has many drawbacks in addition to having a small filtration area, and its actual size is smaller than the nominal size. Can be eliminated. In addition, there is no need for remodeling work or space for installing a wide filter to extend the life.

[0017]

[Effect of the invention]

 The use of the dust filter of the present invention extends the washing and regeneration cycle of the conventional washing and regenerating type, so the cost required for expanding the filter area of the filter cloth is lower than the cost required for the number of replacement washings, and the waste is incinerated without washing. This method has the advantage of eliminating the need for monthly cleaning work, preventing the wastewater from becoming polluted, and eliminating the need to install new purification equipment, thereby reducing capital investment. Furthermore, the collection efficiency of the coarse dust filter of the present invention is 80 to 95% by the weight method, and the high efficiency filter cloth is used. Therefore, the load on the expensive main filter after the coarse dust filter can be reduced, and the replacement cycle can be reduced. Cost can be reduced because it can be extended. Also, the width of the coarse dust filter can be applied to 20 mm or less, 25, 50, and 100 mm, and the replacement cycle can be extended by increasing the filtration area. Furthermore, a filter having a small width and a high filtration area can be applied to an indoor circulation type package air conditioner or a vehicle, and can contribute to obtaining cleaner air.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing a partial cross section of a filter of the present invention.

FIG. 2 is an enlarged view showing a cross section of the filter of the present invention.

[Explanation of symbols]

1 dirty air, 2 dust filter, 3 purified air, 4 filter cloth 5 wire mesh, 6 outer frame, 7 paperboard
, 8 Protrusion 7 'paperboard, t1 thickness, t2 thickness
, P pitch W width, R radius, L distance

Claims (1)

[Utility model registration claims] 1. An outer frame having a high water resistance of 0.8 mm as a coarse dust filter of a filter stem for purifying dirty air.
A rust-proof wire mesh having a width and thickness of 1.0 mm or less and a side length of 30 mm or less in a rectangular outer frame using recycled paperboard having a thickness of less than 80 to 95% by a gravimetric method in terms of collection efficiency. Using a filter cloth bonded and adhered to one side of a filter cloth with a thickness of 1 mm or less, alternately fold a radius of curvature of 5 mm or less, and provide a gap of 0.5 mm or more where the filter cloths do not contact with each other, and set a peak pitch of the folding. After storing the filter cloth which has been folded to 15 mm or less and having an increased filtration area in the outer frame and adhesively attaching the periphery of the filter cloth to the inner surface of the outer frame, the outer periphery of the outer periphery is formed in such a manner that the opening of the filter cloth is minimized on the front and rear surfaces. The width is characterized by being reinforced by gluing the back surface of the paperboard cross-connecting the outer frame and the projection of the folded mountain pitch so that the mountain pitch does not change.
Replaceable foldable coarse dust filter with 0 mm or less.