JP7146835B2 - filter - Google Patents

Description

The present invention relates to filters.

In the fields of environment, water supply and sewage, ultrapure water, food, hygiene, biotechnology, medicine, and clinical fields, dissolution tests that involve the preparation of sample liquids (test liquids) are sometimes performed during sample testing. A filter is often used to prepare a test solution.

For example, in the soil or waste elution test method based on the Soil Contamination Countermeasures Law, a test solution preparation method is stipulated. This dissolution test method is generally carried out by drying, classifying, weighing, extracting with a solvent, centrifuging, filtering the supernatant, and analyzing the resulting filtrate (test solution).

Filtration of the supernatant is carried out using a suction filter, and operations such as injecting the supernatant, recovering the filtrate, exchanging filter papers, and cleaning the filter are performed manually. For this reason, there is a demand for a filter that is easy to handle and work, and that is easy to assemble and disassemble. Further, there is a need for a low cost filter with a low component count.

As such a filter, the following are conventionally known. Patent Literature 1 describes a filter used for bacteriological examination. In this filter, the filter table is covered with the recessed bottom portion of the holder for storing the sample, and the holder and the filter table are held in close contact with each other by the annular protrusion on the outer periphery of the filter table. However, when the holder and the filter stand are held in close contact, a gap may occur between the holder and the peripheral edge of the membrane filter M on the filter stand. Filtration leakage may occur. Furthermore, since the filter has a large number of parts, it takes time and effort to assemble and disassemble the filter, and the filter becomes expensive.

Patent Literature 2 describes a simple extraction filter used for soil testing. In this filter, a cylindrical filter main body and a pair of bottomed cylindrical containers connected to the filter main body and having degassing holes at the bottom thereof are liquid-tightly connected. A filter paper support plate through which the filtrate drop portion penetrates and a filter paper are arranged on the filter paper support plate in the middle part of the filter body. However, since the peripheral edge portion of the filter paper is not fixed, there is a risk that the peripheral edge portion of the filter paper may float during vacuum filtration, resulting in filtration leakage.

Patent Literature 3 describes an experimental filter. In this filter, a filter paper and a filter plate are clamped between a glass funnel in which a sample is stored and a glass base connected to a suction bottle containing a filtrate. However, the stability of the filter is poor, and there are problems with handling and workability. In addition, the pinched portion of the clamp may move, creating a gap between the glass funnel and the filter paper. Furthermore, since the number of parts of the filter is large, assembly and disassembly of the filter are time-consuming and expensive. Since it is made of glass, there are also problems such as fragility.

Patent Document 4 describes a simple filter for filtering impurities in liquid such as tempura oil. This filter has a receiver, a support cylinder, and a filter container, and the outer edge of the element housed in the support cylinder is formed by the liquid-permeable bottom of the support cylinder and the annular flange of the filter container. Compressed. However, this filter has a complicated structure of the filter container, takes time and effort to manufacture, and is expensive.

Patent Literature 5 describes a filtering device for filtering a suspended solution or the like. This filtering device has a first filtering device and a second filtering device, and has a complicated structure and a large number of parts.

JP-A-8-257318 Japanese Utility Model Publication No. 4-41922 Japanese Utility Model Laid-Open No. 62-13505 Japanese Utility Model Publication No. 60-26765 Japanese Utility Model Laid-Open No. 55-167408

SUMMARY OF THE INVENTION It is an object of the present invention to provide a filter that has a small number of parts, is easy to assemble and disassemble, can be manufactured at low cost, and has good workability. do.

In order to solve the above problems, the present invention includes, in order from the top, a sample storage portion, a filter portion, and a filtrate storage portion, the sample storage portion having a filter peripheral pressing portion, and the filter portion and a filter holder, wherein the filter is sandwiched between the filter peripheral pressing portion and the filter holder (Invention 1).

According to this invention (Invention 1), it is possible to provide a filter that has a small number of parts, is easy to assemble and disassemble, can be manufactured at low cost, and has good workability.

In the above invention (invention 1), it is preferable that the filter section has an exhaust port (invention 2). Moreover, in the above inventions (inventions 1 and 2), it is preferable that the filter section has a filtrate guide section that guides the filtrate (invention 3).

According to such inventions (inventions 2 and 3), by sucking from the exhaust port, it is possible to efficiently filter, and furthermore, by having the filtrate guide section, the suction of the filtrate to the exhaust port can be prevented. can be prevented.

In the above inventions (inventions 1 to 3), it is preferable that a cushioning member is arranged between the filter peripheral pressing portion and the filter (invention 4).

According to this invention (invention 4), the cushioning member mitigates the pressure force of the filter peripheral edge pressing portion from being propagated to the filter, so that the filter can be prevented from being distorted or the like.

In the above inventions (inventions 1 to 4), the filtrate storage section is made of a member separate from the sample storage section and the filter section, and a detachable lid member covering the opening of the filtrate storage section is provided. It is preferable to have (Invention 5). In particular, in the above invention (invention 5), it is preferable that the lid member has a lid body, an opening formed in the lid body, and an opening/closing part capable of opening and closing the opening (invention 6).

According to such inventions (inventions 5 and 6), once the filtrate is stored in the filtrate storage part, the lid member is attached to the filtrate storage part, whereby the filtrate can be easily carried or stored. can. In particular, by forming an opening in the lid member and opening and closing the opening with the opening/closing portion, the filtrate can be taken out while the lid member of the filtrate container is attached.

According to the present invention, it is possible to obtain a filter that has a small number of parts, is easy to assemble and disassemble, can be manufactured at low cost, and has good workability.

1 is a front view of a filter according to a first embodiment of the invention; FIG. It is sectional drawing of the filter which concerns on said 1st embodiment. FIG. 3 is an enlarged view of a main part in FIG. 2; It is a top view of the filter which concerns on said 1st one embodiment. FIG. 10 is a plan view showing a cushioning member of the filter according to the second embodiment of the present invention; It is a top view which shows the filter periphery press part of the filter which concerns on said 2nd embodiment. It is the schematic which shows the laminated structure of the filter of the filter which concerns on said 2nd embodiment, a buffer member, and a filter peripheral pressing part. It is a longitudinal cross-sectional view which shows the lamination state of the filter of the filter device which concerns on said 2nd embodiment, a buffer member, and a filter peripheral-edge pressing part. FIG. 10 is a perspective view showing a state in which a lid member is attached to the filtrate container in the filter according to the third embodiment of the present invention. FIG. 11 is a plan view showing another example of the cover member of the filter according to the third embodiment; FIG. 11 is a right side view showing another example of the cover member of the filter according to the third embodiment;

[First embodiment]
A more detailed description will be given below with reference to the drawings. 1-4 show a filter according to a first embodiment of the invention. As shown in FIG. 1 , the filter 1 includes at least a sample reservoir 2 , a filter 3 , and a filtrate reservoir 4 . Moreover, as shown in FIGS. 2 to 4, the sample storage section 2 has at least a filter peripheral pressing section 21, and the filter section 3 has at least a filter holder 31. As shown in FIGS.

<Sample storage section>
The sample storage part 2 stores a sample to be filtered, and has at least a filter peripheral pressing part 21 .

As shown in FIGS. 2 and 3, the sample reservoir 2 has an upper opening 22 for receiving the sample, a lower opening 23 connected to the filter, a peripheral wall 24 formed between the upper and lower openings, and an upper opening. One or more of a storage portion 25 defined by the opening 22 , the lower opening 23 and the peripheral wall 24 and a connecting portion 26 may be provided.

The shape of the sample storage part 2 is not particularly limited, and is, for example, cylindrical, preferably cylindrical. The sample stored in the sample storage unit 2 is, for example, a sample solution for preparing a test solution in a soil elution test method.

The filter peripheral edge pressing portion 21 presses the filter peripheral edge, and is provided, for example, in the vicinity of the lower opening 23 so as to face the filter portion 3 . The filter peripheral pressing portion 21 may function as a sealing member for liquid-tightly connecting the sample storage portion 2 and the filter portion 3 when the connecting portion 26 and the upper connecting portion 35 are connected. Thereby, the number of parts can be reduced.

The filter peripheral edge pressing portion 21 prevents the peripheral edge portion of the filter F from being turned up and filtering leakage from occurring when filtering is performed. In particular, it is effective when performing suction filtration in which the peripheral portion of the filter F is often turned up.

The filter peripheral pressing portion 21 is compressed and presses the filter F when the sample storage portion 2 and the filter portion 3 are connected by the connecting portion 26 and the upper connecting portion 35 . Thereby, the filter peripheral edge pressing part 21 can fix the peripheral edge part of the filter F. As shown in FIG.

Such a filter peripheral pressing portion 21 is made of an elastic material such as rubber or elastomer. For example, it is composed of materials such as silicone rubber, natural rubber, synthetic rubber, urethane rubber, and polyolefin elastomer.

The shape of the filter peripheral pressing portion 21 is adapted to the shape of the filter. For example, when pressing the peripheral edge of a circular filter F such as filter paper, it may be shaped like a ring.

The sample storage part 2 and the filter peripheral pressing part 21 may be detachably or non-detachably fixed by known means such as fitting, adhesion, and integral molding.

The peripheral wall 24 may be provided with a handle (not shown) for improving workability. In addition, the peripheral wall 24 can be provided with a scale indicating the amount of sample stored.

The capacity of the reservoir 25 is not particularly limited, and may be, for example, 500-2000 ml.

The connecting part 26 can be provided in the lower part of the sample storage part. For example, it can be provided on the outer peripheral surface or the inner peripheral surface of the peripheral wall 24 . In one embodiment shown in FIG. 2, the connecting portion 26 is provided as a female threaded portion extending from the lower end of the peripheral wall 24 and screwed with the male threaded portion that is the upper connecting portion 35 .

<Filter section>
The filter section 3 filters the sample in the sample storage section using the filter F, and has at least a filter holder 31 . The filter part 3 may have an exhaust port 32, a filtrate guiding part 33, a peripheral wall 34, an upper connecting part 35, and a lower connecting part 36, as shown in FIGS. Moreover, the holder support part 37 may be provided.

Filter F is supported by filter holder 31 and filters the sample received in sample reservoir 2 . The filter F is made of a filter material such as paper, non-woven fabric, glass filter, or the like. Examples include filter paper. The filter F may be in the form of a sheet with a pore size of 0.1 to 1 μm and a diameter of 50 to 200 mm, for example.

The shape of such a filter F is not particularly limited, and may be any shape such as a sheet shape such as a disk shape, or a three-dimensional shape such as a cone shape. During filtration, the filter F is appropriately exchanged for use.

The filter holder 31 has one or more holes that communicate between the sample reservoir and the filtrate reservoir. For example, the entire surface or part thereof is formed of a net, a perforated plate, a porous body, or the like. The filter holder 31 supports the entire surface or part of the filter F, and is sandwiched together with the filter F between the sample storage section 2 and the filtrate storage section 4 .

When the filter holder 31 supports the entire surface of the filter F, the filter peripheral edge pressing part 21 can reliably press the filter peripheral edge even if the filter F is not self-sustaining, such as a thin filter paper. For this reason, vacuum filtration can be performed without causing displacement or lifting of the peripheral portion.

The shape of the filter holder 31 is not particularly limited, and has a shape that allows the filter peripheral edge pressing portion 21 of the sample storage part 2 to press the peripheral edge of the filter F while supporting the filter F. As shown in FIG. For example, there is a plate-like shape that supports the filter F in a planar shape.

Such a filter holder 31 can be, for example, a disc having a thickness of 0.5-10 mm, a diameter of 50-120 mm, and a porosity of 10-60%. In FIG. 3, the filter holder 31 is made larger than the shape of the filter F, but it can be made smaller than the shape of the filter F as well. The filter holder 31 can be provided with concave portions, convex portions, notches, indications, etc. in order to prevent displacement of the filter F, etc., in the portion that supports the filter F. As shown in FIG.

The filter holder 31 may be supported by the peripheral wall 34 . For example, it may be mounted on the upper end of the peripheral wall 34, or may be detachably or non-detachably fixed to the peripheral wall 34 by known means such as fitting, adhesion, and integral molding. In this case, it is not necessary to provide the holder support portion 37 . Moreover, the filter holder 31 may be separated from the filtrate guiding portion 33 or may be in contact with the filtrate guiding portion 33 .

Moreover, the filter holder 31 may be supported by the holder support portion 37 . For example, it may be placed on the holder support portion 37, or may be detachably or non-detachably fixed to the holder support portion 37 by known means such as fitting, adhesion, and integral molding. In this case, the holder support portion 37 may be integrated with the filtrate guide portion 33 , may not be integrated with the filtrate guide portion 33 , or may be integrated with the peripheral wall 34 .

The exhaust port 32 is connected to suction means such as a vacuum pump by a hose or the like to create a negative pressure inside the filter. One or more exhaust ports 32 can be provided at any location. The exhaust port 32 is preferably provided so that the suction force acts on the filter F evenly.

The filtrate guide section 33 guides the filtrate that has passed through the filter F and the filter holder 31 to the filtrate storage section 4 . For example, it can be funnel-shaped or cylindrical. The filtrate guide portion 33 may be integrated with one or more of the filter holder 31 , the peripheral wall 34 and the holder support portion 37 .

For example, the funnel-shaped lower end portion of the filtrate guiding portion 33 may communicate with the opening portion 41 of the filtrate accommodating portion 4 . Further, the inner surface of the filtrate guiding portion 33 may have a convex portion 38 that supports the filter holder 31 .

The filtrate guiding part 33 can be formed between the filter holder 31 and the exhaust port 32 . This can prevent the filtrate from being sucked into the exhaust port 32 .

The upper connecting part 35 connects with the connecting part 26 of the sample storage part 2 to integrate the sample storage part 2 and the filter part 3 . The upper connection part 35 can be provided above the exhaust port 32, for example. In one embodiment shown in FIG. 2 , the upper connecting portion 35 is provided as a male threaded portion on the outer peripheral surface of the peripheral wall 34 and screwed with the female threaded portion of the connecting portion 26 of the sample storage portion 2 .

The lower connecting portion 36 connects with the connecting portion 43 of the filtrate containing portion 4 to integrate the filter portion 3 and the filtrate containing portion 4 . The lower connecting part 36 can be provided below the exhaust port 32, for example. In one embodiment shown in FIG. 2 , the lower connecting portion 36 is provided as a female screw portion extending from the lower end of the peripheral wall 34 and screwed with the male screw portion of the connecting portion 43 of the filtrate storage portion 4 .

The holder support portion 37 supports the filter holder 31 . In one embodiment shown in FIG. 3, the holder support portion 37 has a shape protruding from the inner peripheral surface of the peripheral wall 34 and supports the filter holder 31 on its upper surface. The holder support portion 37 may be integrated with the filtrate guiding portion 33 and/or the peripheral wall 34 .

A portion of the holder supporting portion 37 that supports the filter holder 31 may be provided with a concave portion, a convex portion, a notch, a display, or the like in order to prevent the filter holder 31 from being dislocated.

<Filtrate container>
The filtrate storage part 4 stores the filtrate filtered by the filter. As shown in FIG. 2, the filtrate container 4 has at least an opening 41 for receiving the filtrate, a container 42 for containing the filtrate, and a connecting portion 43 . The shape of the filtrate storage unit 4 is not particularly limited, and may be, for example, a cup-shaped container having an opening 41 at the top, a flask-shaped container, or the like, preferably a bottomed cylindrical container. . At least one handle 44 may be provided on the side surface of the filtrate container 4 in order to improve workability. In addition, a scale indicating the amount of filtrate stored in the storage portion 42 can be provided on the side surface of the filtrate storage portion 4 .

The capacity of the container 42 is not particularly limited, and is set to 500 to 2000 ml, for example. Also, the connecting portion 43 is connected to the lower connecting portion 36 of the filter portion 3 .

<Constituent material of the filter>
Filter 1 is made of any material such as plastic, glass, or metal. Examples of plastics include polyolefin resins such as polypropylene and polyethylene, polyester resins such as PET, heat-resistant resins such as polysulfone and polyimide, fluorine resins, acrylic resins, and the like. Examples of metals include stainless steel and aluminum.

When the filter 1 is made of plastic, it can be manufactured at a low cost, is light in weight, and is easy to handle because it is less likely to be damaged, and can prevent metallic contamination of the filtrate. The filter 1 may be made of a material (such as a transparent material) that allows confirmation of the content and amount, or may be made of a material that does not allow confirmation of the content and amount. In order to enable heat sterilization, it may be made of a heat-resistant resin.

<Connecting Means of Connecting Portion>
Each connecting portion in the filter of the present invention has connecting means or the like manually operated by an operator or using a tool or the like. Examples of connecting means include a screw mechanism, an engaging mechanism (having the same structure as a buckle-type fastener combining a male insertion member and a female insertion member, etc.), a bayonet lock mechanism, a tightening mechanism using bolts, and the like. Means using one or more mechanisms of Alternatively, means such as adhesion or integral molding may be used. Considering maintenance such as cleaning, the filter 1 can be assembled detachably.

<Assembly/disassembly of filter>
The method of assembling/disassembling the filter 1 of the present invention is not particularly limited. For example, the filter 1 shown in FIGS. 1-4 can be assembled by the following methods (1)-(5).
(1) The filter peripheral pressing portion 21 is integrated with the sample storage portion 2 .
(2) The holder support portion 37 of the filter portion 3 and the filtrate storage portion 4 are integrated by the lower connecting portion 36 and the connecting portion 43 .
(3) The filter holder 31 is supported by the holder support portion 37 .
(4) Support the filter F with the filter holder 31 .
(5) The sample storage part 2 and the filter part 3 are integrated by the connecting part 26 and the upper connecting part 35 .

After assembling the filter 1, the exhaust port 32 and an exhaust device (such as a vacuum pump) are connected with a hose or the like. After that, the sample is introduced from the upper opening 22 of the sample reservoir 2, and suction filtration can be performed by driving the exhaust device. In addition, when disassembling the filter 1, for example, the order of assembly may be reversed.

[Second embodiment]
Next, a filter according to a second embodiment of the invention will be described. Since the filter of this embodiment basically has the same configuration as the filter 1 of the first embodiment described above, detailed description of the same configuration will be omitted. In this embodiment, as shown in FIGS. 5 to 8, a structure in which a flat ring-shaped cushioning member 27 and a flat ring-shaped filter peripheral pressing portion 21 are stacked on a filter F supported by a filter holder 31 is provided. have. As a result, the structure is such that the buffer member 27 is interposed between the filter F and the filter peripheral edge pressing portion 21 .

The cushioning member 27 is made of a sheet of a material having pressure absorption and slidability, such as an expandable resin sheet. For example, it is made of a material such as expanded styrene or expanded polyethylene.

By adopting such a configuration, it is possible to suitably prevent the sample liquid from leaking from the filter F to the storage section 42 . This is for the following reasons. That is, in the first embodiment, after the filter F is supported by the filter holder 31, the sample storage part 2 and the filter part 3 are screwed together by the connecting part 26 and the upper connecting part 35, so that the peripheral edge of the filter is The pressing portion 21 is fixed to the peripheral portion of the filter F. At this time, the filter F is in close contact with the filter peripheral pressing portion 21 made of silicone rubber or the like. The sample liquid may leak from the filter F into the storage section 42 due to stress generated in the direction of rotation of the filter F, which causes wrinkles, sagging, and the like in the filter F. On the other hand, in the present embodiment, since the buffer member 27 is interposed between the filter F and the filter peripheral pressing portion 21, the filter peripheral pressing portion when the sample storage portion 2 is screwed to the filter portion 3 is removed. The cushioning member 27 exerts pressure absorption and rotational stress dissipating properties to reduce the pressure and rotational pressure transmitted from 21 to the filter F, thereby preventing the filter F from wrinkling and sagging. Because you can.

[Third embodiment]
Furthermore, a filter according to a third embodiment of the present invention will be described. Since the filter of this embodiment basically has the same configuration as the filter 1 of the first embodiment described above, detailed description of the same configuration will be omitted. In this embodiment, as shown in FIG. 9, a lid member 5 is provided that can be screwed with the male screw portion of the connection portion 43 of the storage portion 42 that stores the filtrate.

Thus, once the filtrate is stored in the storage portion 42, by attaching the lid member 5 to the storage portion 42, the filtrate can be easily carried or stored.

10 and 11, as the lid member 5A, an opening/closing portion having a lid body 51, an opening 52 formed in the lid body 51, and an opening receiving portion 54 capable of opening and closing the opening 52 is provided. 53 may be used. By using such a lid member 5A, once the lid member 5A is attached to the storage portion 42, the opening portion 52 is opened and closed by the opening/closing portion 53, and the filtrate is taken out while the lid member 5 is attached to the storage portion 42. be able to.

<Other embodiments (modifications)>
As described above, the filter of the present invention has been described based on the above embodiments, but the present invention is not limited to the above embodiments, and various modifications can be made. For example, the sample storage part 2, the filter part 3, and the filtrate storage part 4 may be separate members as in the above-described embodiments, but may be integrated by adhesion, integral molding, etc. Specifically, the filter portion 3 and the filtrate storage portion 4 may be integrated. In the filter portion 3, the filter holder 31 and the holder support portion 37 are integrated by adhesion, integral molding, or the like. good too. Furthermore, by integrating the filter portion 3 in advance and using it in the form of a filter cartridge, it is possible to simplify the filter replacement work. Furthermore, the sample storage part 2, the filter part 3, and the filtrate storage part 4 do not have to be joined by screwing, and may be joined by fitting. Alternatively, flange portions are formed at the joint portions of the sample storage portion 2, the filter portion 3, and the filtrate storage portion 4, respectively, and are brought into contact with each other. good too. In this case, since the filter of the filter of the present invention is made of resin and is lightweight, it is preferable to select a clamping member that is as small as possible.

1 filter 2 sample storage part 21 filter peripheral pressing part 22 upper opening 23 lower opening 24 peripheral wall 25 storage part 26 connecting part 27 buffer member 3 filter part F filter 31 filter holder 32 exhaust port 33 filtrate guiding part 34 peripheral wall 35 Upper connection portion 36 Lower connection portion 37 Holder support portion 38 Convex portion 4 Filtrate storage portion 41 Opening 42 Storage portion 43 Connection portion 44 Handle 5 Lid member 5A Lid member 51 Lid body 52 Opening 53 Opening/closing portion 54 Opening receiving portion

Claims (6)

A sample storage unit, a filter unit, and a filtrate storage unit are provided in order from the top,
The sample storage part has a connecting part provided at its lower part, a flat ring-shaped filter peripheral pressing part, and a flat ring-shaped cushioning member ,
The filter part has an upper connection part provided on its upper part and a filter holder,
A filter is sandwiched between the filter peripheral pressing portion and the filter holder ,
The buffer member is arranged between the filter peripheral pressing portion and the filter,
The filter peripheral edge pressing portion is fixed to the peripheral edge portion of the filter by screwing the sample storage portion and the filter portion together with the connecting portion and the upper connecting portion.
filter. 2. The filter according to claim 1, wherein said flat ring-shaped cushioning member comprises a sheet of material having pressure absorption and sliding properties. 3. The filter according to claim 1, wherein said filter section has an exhaust port. The filter according to any one of claims 1 to 3, wherein the filter section has a filtrate guide section that guides the filtrate. 5. Any one of claims 1 to 4, wherein the filtrate storage section is formed of a member separate from the sample storage section and the filter section, and has a detachable lid member that covers the opening of the filtrate storage section. 3. Filter according to paragraph. 6. The filter according to claim 5, wherein the lid member has a lid body, an opening formed in the lid body, and an opening/closing part capable of opening and closing the opening.

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