JPH0713413U - Composite filter - Google Patents

Abstract

(57) [Abstract] [Purpose] It is intended to provide a filter capable of performing multi-stage filtration in one housing and easily replacing a filter element. [Structure] A plurality of filter elements having different filtration accuracies are housed in one filter case in the order of coarse to dense filtration accuracy from the upstream side to the downstream side, and the liquids to be filtered have respective filter elements. A filter characterized by being isolated through a partition wall so that they can pass sequentially.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a filter suitable for filtering water, liquid such as paint, and gas.

[0002]

[Prior art]

 As a filter element for filtering a fluid, there is a tubular filter body disclosed in JP-B-56-43139 or JP-B-56-49605. The standard size of the filter element is an outer diameter of 60 to 70 mm, an inner diameter of about 30 mm, and a length of 250 mm, and these are mounted one by one in the housing for use. The finer the filtration accuracy of these filters, the more easily they become clogged and the higher the unit price. As a means for reducing the clogging of filters with fine filtration accuracy, a multi-step filtration method has been adopted in which coarse to medium fine to fine accuracy filters are sequentially provided from the upstream side of the fluid to perform filtration. Since the multi-stage filtration method uses multiple filter elements with different filtration accuracy, it requires as many housings as there are filter element types, which is excellent for extending the filter life, but it requires a significantly large installation space. However, when replacing the filter element, it is necessary to open multiple housings before starting work.

Further, when the naked filter element is directly attached to the housing for use, there is a problem in that the collected and accumulated precipitates contaminate an operator or the inside of the housing when the filter element is replaced. . Japanese Utility Model Publication No. 1-37690 discloses that a filter cartridge is housed in a filter case, and a check valve urged by a spring is arranged in at least one of a liquid inlet and a liquid outlet formed in a filter case. An installed filtration device is disclosed. This device can solve the above-mentioned problem of contamination, but when performing multi-stage filtration, multiple filter housings must be installed in series, which again requires a large installation space. Remains.

[0004]

[Problems to be solved by the device]

 An object of the present invention is to provide a filter capable of performing multi-stage filtration in one housing and easily replacing the filter element.

[0005]

[Means for Solving the Problems]

 A plurality of filter elements with different filtration accuracy are housed in one filter case, and the filter elements are separated by a partition wall so that the liquid to be filtered passes through each filter element in sequence. Has achieved the intended purpose. Hereinafter, the composite filter of the present invention will be described in detail with reference to the drawings.

[0006]

[Figure 1]

FIG. 1 is a sectional view showing an embodiment of the filter of the present invention. The filter case (1) is composed of an upper lid (2), a body (3) and a lower lid (4). The upper pipe (2) has an introduction pipe (5) and the inner wall of the body (3) has a partition wall ( 7), but the lower lid (4) is provided with discharge pipes (6), respectively. The first filter element (8) mounted in the filter case (1) has a cap (9) fitted on the upper end thereof to allow fluid to flow directly into the inside (10) from the upper end surface of the filter element (8). In addition to preventing entry, the lower end is fitted to the upper surface of the partition wall (7) to prevent fluid from directly entering the interior (10) from the lower end surface of the filter element (8). The second filter element (11) mounted in the filter case (1) is fitted with a cap (12) at the upper end so that fluid flows directly into the inside (13) from the upper end surface of the filter element (11). In addition to preventing entry, the lower end is fitted to the upper surface of the lower lid (4) to prevent fluid from entering the inside (13) directly from the lower end surface of the filter element (11). Here, as the second filter element (11), one having a smaller filtration accuracy than the first filter element (8) is used.

Therefore, the fluid introduced from the introduction pipe is passed through the flow path (14) constituted by the gap between the body (3) of the filter case (1) and the first filter element (8) to the filter element (8). ), The coarse particles are removed to reach the inside (10) of the filter element (8), and the gap is formed between the barrel (3) of the filter case (1) and the second filter element (11). The flow path (15) passes through the filter element (11) to remove fine particles, reach the inside (13) of the filter element (11), and are discharged from the discharge pipe (6). Such a filter can be manufactured by the following procedure, but is not limited to this. Prepare a filter case divided into an upper lid (2), a body (3) and a lower lid (4). The filter element (8) having the upper end fitted with the cap (9) is fitted onto the upper surface of the partition wall (7) in the barrel (3). The filter element (11) having the cap (12) fitted to the upper end is fitted to the lower lid (4). Then, the upper lid (2), the body (3) and the lower lid (4) are joined.

There is no particular limitation on the material of the filter case and the material of the filter element, and a material suitable for the property of the liquid to be filtered may be appropriately selected. For example, a combination of a filter element made of a metal or ceramic sintered body and a metal filter case is preferable for a high temperature fluid, and a combination of a filter element made of a synthetic fiber and a plastic filter case is used for a normal temperature fluid. To be Special for joining the body (3) to the upper lid (2) and lower lid (4), and to joining the filter elements (8, 11) to the caps (9, 12) and partition walls (7). There is no particular limitation, and methods such as welding, adhesives, fitting, and screwing can be appropriately selected and used according to the respective materials.

Further, a check valve can be provided in the introduction pipe and / or the discharge pipe of the filter, and by doing so, contamination of the working environment at the time of replacement of the filter element can be prevented. In the above, an example in which two filter elements are attached to one filter case has been described, but three or more filter elements can be attached depending on the purpose.

[0011]

【Example】

The composite filter of the present invention will be described in more detail with reference to examples. The filtration performance test used in the examples was according to the following method. [Filtration accuracy] Circulate water from a 30-liter water tank at a flow rate of 30 liters per minute. 0.5 g of a cake (7 types of JIS Z8901 test dust: Kanto loam, average particle size 29 μm) is put into a water tank, and the filtrate after 1 minute is collected. Measure the particle size of the particles that have flowed into the filtrate with a particle size distribution analyzer, and use the maximum particle size as the filtration accuracy. [Filtration Life] Circulate water from a 30 liter water tank at a flow rate of 30 liters per minute. Add 0.5g of cake (7 types of JIS Z8901 test dust: Kanto loam, average particle size 29μm) into the water tank at a rate of 3kg / cm ² until the pressure difference between the inlet and outlet of the filter reaches 3kg / cm ^2. Let the filtration life.

Example 1 A composite fiber web having a sheath component of polyethylene and a core component of polypropylene and having a fiber diameter of 50 μm was wound on a winding core while being heated to about 140 ° C., an outer diameter of 65 mm, an inner diameter of 30 mm, and a length. A 240 mm cylindrical filter element (A) was obtained, and a polyethylene cap having a diameter of 65 mm and a thickness of 1 mm was welded to one end thereof. Filter with the above cap welded into a filter case cylinder having a diameter of 80 mm, a thickness of 2 mm, and a length of 248 mm, and a partition wall having a diameter of 30 mm and a partition wall having a diameter of 30 mm at the bottom. The element (A) was welded.

A composite fiber web having a sheath diameter of polyethylene and a core component of polypropylene and a fiber diameter of 20 μm is wound on a winding core while being heated to about 140 ° C., and is a cylinder having an outer diameter of 65 mm, an inner diameter of 30 mm, and a length of 240 mm. A filter element (B) in the shape of a circle was obtained, and a polyethylene cap having a diameter of 65 mm and a thickness of 1 mm was welded to one end thereof. Weld the above cap inside a filter case body with a polyethylene cylinder with a diameter of 80 mm, a thickness of 2 mm, and a length of 248 mm, and a polyethylene lid with a thickness of 2 mm with a discharge pipe with a diameter of 30 mm in the center. The prepared filter element (B) was welded. The filter case body containing the filter element (A) is welded onto the filter case body containing the above filter element (B), and a polyethylene upper lid having a thickness of 2 mm is welded onto the filter case body to obtain a total length of 520 mm ( A filter (F1) of the present invention corresponding to FIG. 1 (including the introduction tube) was obtained. This filter was attached to a housing capable of accommodating two standard size filter elements, and the filtration performance was measured. As a result, the filtration accuracy was 20 μm and the filtration life was 110 minutes. Moreover, the installation space of this housing was about 8.5 liters, the time required to replace the filter was about 1 minute, which was about 1/3 of the time required to replace the conventional filter.

Comparative Example 1 An outer diameter of 65 mm and an inner diameter of 30 mm obtained by winding a composite fiber web having a sheath component of polyethylene and a polypropylene component of 50 μm and a fiber diameter of 50 μm while being heated to about 140 ° C. A cylindrical filter element (M) having a length of 250 mm, and a composite fiber web having a fiber diameter of 20 μm and having polyethylene as a sheath component and polypropylene as a core component and being wound around a core while being heated to about 140 ° C. In addition, a cylindrical filter element (N) with an outer diameter of 65 mm, an inner diameter of 30 mm, and a length of 250 mm is attached to each standard size housing, and the filter (M) is connected by piping so that it is on the upstream side. As a result of measuring the filtration performance, the filtration accuracy was 21 μm and the filtration life was 111 minutes. The installation space of this housing was about 12 liters, which was 1.4 times that of Example 1. It took about 3 minutes to replace the filter.

Example 2 A composite fiber web having a sheath diameter of polyethylene and a core component of polypropylene and having a fiber diameter of 75 μm was wound on a winding core while being heated to about 140 ° C., and the outer diameter was 65 mm, the inner diameter was 30 mm, and the length was 30 mm. A 116 mm cylindrical filter element (C) was obtained, and a polyethylene cap having a diameter of 65 mm and a thickness of 1 mm was welded to one end thereof. A filter in which the cap is welded in a filter case cylinder in which a 2 mm-thick partition wall with a hole of 30 mm in the center is provided at the bottom of a polyethylene cylinder having a diameter of 80 mm, a thickness of 2 mm, and a length of 124 mm. The element (C) was welded. A composite fiber web having a sheath component of polyethylene and a core component of polypropylene and a fiber diameter of 50 μm is wound around a core while heating at about 140 ° C., and a cylindrical filter having an outer diameter of 65 mm, an inner diameter of 30 mm, and a length of 116 mm. An element (D) was obtained, and a polyethylene cap having a diameter of 65 mm and a thickness of 1 mm was welded to one end of the element (D). Weld the above cap into the filter case body, which has a polyethylene cylinder with a diameter of 80 mm, a thickness of 2 mm, and a length of 124 mm, and a polyethylene lower lid with a thickness of 2 mm and a discharge pipe with a diameter of 30 mm in the center. The prepared filter element (D) was welded. A filter case body containing the filter element (C) is welded onto the filter case body containing the filter element (D), and a polyethylene upper lid having a thickness of 2 mm is welded onto the filter case body having a total length of 250 mm. The filter (F2) of the present invention was obtained.

A composite fiber web having a sheath diameter of polyethylene and a core component of polypropylene and having a fiber diameter of 35 μm is wound on a winding core while being heated to about 140 ° C., and is a cylinder having an outer diameter of 65 mm, an inner diameter of 30 mm, and a length of 116 mm. A filter element (E) was obtained, and a polyethylene cap having a diameter of 65 mm and a thickness of 1 mm was welded to one end of the filter element (E). Filter in which the above cap is welded in a filter case cylinder in which a polyethylene cylinder having a diameter of 80 mm, a thickness of 2 mm and a length of 124 mm is provided with a partition wall having a diameter of 30 mm and a partition wall having a thickness of 2 mm at the center thereof. Element (E) was welded. A composite fiber web having a fiber diameter of 25 μm and containing polyethylene as a sheath component and polypropylene as a core component is wound on a winding core while being heated to about 140 ° C., and is a cylindrical filter having an outer diameter of 65 mm, an inner diameter of 30 mm, and a length of 116 mm. An element (F) was obtained, and a polyethylene cap having a diameter of 65 mm and a thickness of 1 mm was welded to one end of the element (F). Weld the above cap into the filter case body, which has a polyethylene cylinder with a diameter of 80 mm, a thickness of 2 mm, and a length of 124 mm, and a polyethylene lower lid with a thickness of 2 mm and a discharge pipe with a diameter of 30 mm in the center. The prepared filter element (F) was welded.

A filter case body containing the filter element (E) is welded onto the filter case body containing the filter element (F), and a polyethylene upper lid having a thickness of 2 mm is welded onto the filter case body. A filter (F3) of the present invention having a total length of 250 mm was obtained. Insert the filter (F3) inlet tube into the filter (F2) outlet tube and integrate it, and then install the filter (F3) in a housing that can store two standard size filter elements. The filtration life was 123 minutes, and the time required for filter replacement was about 1 minute.

[0018]

[Effect of device]

 Since the composite filter of the present invention contains a plurality of filter elements having different filtering accuracy in one filter case, it is possible to carry out multi-stage filtration within one housing, thus saving the installation space of the filter. The filter replacement work can be done easily and in a short time.

[0019]

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the filter of the present invention.

[Explanation of symbols]

 1: Filter case 2: Upper lid 3: Body 4: Lower lid 5: Inlet pipe 6: Discharge pipe 7: Partition wall 8: First filter element 9: Cap 10: Inside 11: Second filter element 12: Cap 13 : Inside 14, 15: Flow path

Claims (4)

[Scope of utility model registration request] 1. A plurality of filter elements having different filtration accuracies are housed in one filter case in the order of coarse to dense filtration accuracy in the direction from the upstream side to the downstream side, and the liquids to be filtered are respectively filtered. A filter characterized by being isolated through a partition wall so as to pass through the elements sequentially. 2. The filter according to claim 1, wherein the number of filter elements is two. 3. The filter according to claim 1, wherein the number of filter elements is three or more. 4. The filter according to claim 1, wherein a check valve is provided on the introduction pipe and / or the discharge pipe of the filter case.