JPH02119905A - Tubular filter - Google Patents

Abstract

PURPOSE:To easily remove the microsolids contained in the fluid to be filtered by providing peripheral flow passages consisting of plural slit grooves and a central flow passage constituted of the front ends of plural projecting lines constituting the slit grooves to the inside of a tubular body. CONSTITUTION:The plural projecting lines 3 the front ends of which extend in the axial direction are formed apart prescribed intervals along the axial line direction to the inner peripheral wall of the tubular body 2, by which the plural peripheral flow passages 5 consisting of the slit grooves are formed to the inner peripheral wall side of the tubular body 2. Further, the central flow passage 4 enclosed by the projecting lines 3 is formed to the central part of the tubular body 2 and the fluid in the central flow passage 4 or the periph eral flow passages 5 is discharged to the peripheral flow passages 5 of the central flow passage 4, by which the microsolids, etc., contained in the fluid re removed or captured. Since the tubular filter has the tubular outside shell part, the filter can be simply and easily built into a flow passage and is usable without using special fixing jigs.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tubular filter that can be effectively used for removing or collecting minute solids contained in fluids, particularly liquids.

[Conventional technology]

Filter materials for removing and capturing minute solids and impurities contained in fluids can be made of fiber materials,
There are porous materials and mesh materials, and there are a wide variety of shapes of filtration devices that use such filtration media. It needs to pass well.

Therefore, while holding the filter member.

A device is essential to secure fluid introduction and discharge channels and to prevent fluid leakage.

For example, in artificial dialysis, in a method of filtering impurities contained in blood, a filtration device is provided with various fixtures in the middle of a circulation flow path through which blood is circulated.

[Problem to be solved by the invention]

However, when installing a filtration device in a fluid flow path when removing or capturing impurities contained in a fluid, the fixture for fixing the filtration device occupies a large amount of the flow path to be filtered. The flow conduit necessarily needs to be large.

For this reason, there are many restrictions on the design of the flow path, which makes it look unsightly, and there are many practical problems such as the need for fixtures to fix the filtration device when used outside the flow path. ing.

In view of the current situation, it is an object of the present invention to provide a tubular filter for fluids that does not require any special fixtures, is inexpensive, and is easy to handle.

[Means to solve the problem]

In order to achieve the above object, the tubular filter of the present invention has a plurality of protrusions formed at predetermined intervals along the axial direction on the inner circumferential wall of the tubular body, the tips of which extend in the axial direction. By doing so, a plurality of peripheral channels made of slit grooves are formed on the inner circumferential wall side of the tubular body, and a central channel surrounded by protrusions is formed in the center of the tubular body, and the central channel or the peripheral flow path is formed at the center of the tubular body. The fluid in the channel is drained into the peripheral channel or the central channel to remove or capture minute solids contained in the fluid.

There are no particular restrictions on the material of the tubular body constituting the tubular filter, but by using a thermoplastic synthetic resin material that can be extruded.

It can be obtained cheaply and in large quantities.

The plurality of protrusions provided on the inner circumferential wall of the tubular body have their distal ends oriented in the axial direction, and are formed along the axial direction at predetermined intervals.

There is no limit to the cross section of the protrusions, but by changing the width of the opening end of the slit groove formed between the protrusions,
The limits of fine solids, etc. to be removed or captured can be easily changed.

Further, the filtration life can be simply and easily adjusted by the number of slit grooves formed by the protrusions provided on the inner circumferential wall of the tubular body, the length of the tubular body, and the cross-sectional shape of the slit grooves.

[For production]

Since the tubular filter of the present invention has an outer shell formed of a tubular molded body, it can be simply and easily incorporated into a fluid flow path.

Moreover, this tubular filter has a peripheral flow path consisting of a plurality of slit grooves inside the tubular body, and a central flow path constituted by the tips of a plurality of protrusions forming the slit grooves. When fluid flows through the peripheral flow path, when the fluid passes through the tip of each adjacent protrusion at a predetermined interval and flows out into the peripheral flow path or the central flow path, the width of the slit contained in the fluid is greater than or equal to the width of the slit contained in the fluid. solids, etc. can be removed or captured.

In addition, when removing or capturing microscopic solids contained in a fluid with this tubular filter, specifically, one end of the tubular body is brought into contact with the fluid to be filtered, and the other end is depressurized to force the fluid to be filtered into the tubular body. and a method of introducing the fluid to be filtered into the tubular body by utilizing suction due to capillary force of the fluid to be filtered into a slit groove formed on the inner peripheral wall side of the tubular body.

There are methods such as allowing the fluid to be filtered to flow into a tubular body under pressure, but which method to use depends on the type of fluid to be filtered and the type and size of the microscopic solids that are to be removed or captured. The selection should be made as appropriate.

〔Example〕

Hereinafter, various aspects of the tubular filter of the present invention will be specifically explained based on the accompanying drawings.

The tubular filter 1 shown in FIG. 1 consists entirely of a tubular body 2 made of synthetic resin and having an appropriate length.

On the inner circumferential wall of the tubular body 2, a plurality of protrusions 3, 3, . It is formed along the axial direction.

Thus, the protrusions 3, 3... form a central flow path 4 through which fluid can flow around the axis of the pipe portion of the tubular body 2, and at a predetermined interval. Slit grooves 5, 5... are formed between the protrusions 3, 3, . . . adjacent to each other, and these slit grooves 5, 5... Peripheral flow path 5.5 on the peripheral wall side...
(For convenience, slits 5.5... are shown with the same reference numerals).

The tubular filter 21 shown in FIG. 2 has six flat protrusions 23, 23... integrally provided at a predetermined interval on the inner circumferential wall so that they can be mutually connected. By forming slit grooves between adjacent protrusions and retracting the slit grooves inward, six peripheral channels 25.
25 . 25・
... communicate with each other at the opening of the slot.

A tubular filter 31 shown in FIG. 3 is attached to the inner peripheral wall of a tubular body 32 made of a thermoplastic synthetic resin material.

By arranging 15 protrusions 33, 33, . . . formed by reducing the diameters of three bulges in the distal direction and gradually tapering them at predetermined intervals.

A plurality of peripheral passages 35 consisting of slit grooves are formed between each protrusion 33, 33, and a central passage 34 is formed in the center of the tubular body by the tip of each protrusion 33. The central channel 34 and each peripheral channel 35 communicate with each other at the tip of the slit groove.

In this way, in the tubular filter of the present invention, the peripheral flow path and the central flow path formed by the protrusions integrally provided on the inner circumferential wall of the tubular body can be freely changed by changing the cross-sectional shape of the protrusions. Things that can be changed are the type and flow rate of the fluid to be filtered.

Furthermore, the cross-sectional shape of the protrusions constituting the slit grooves and the opening width at the tip of each slit groove can be appropriately selected depending on the particle size of the solids contained in the fluid to be filtered, the filtration method, the processing time required for filtration, etc. good.

Next, we will discuss the specific method of using the tubular filter of the present invention. Either one is closed and used.

For example, if the usage example of the tubular filter 1 shown in FIG. 1 is explained with reference to FIG. Obstruction.

When the fluid to be filtered flows into the opening of the central flow path 4 located at the other end of the tubular body 2, the fluid to be filtered that has flowed into the tubular body 2 is Because it is closed by member 6.

After flowing out into each peripheral flow path 5 communicating with the central flow path 4,
It is discharged from one opening of each peripheral flow path 5.

Therefore, solids, etc. contained in the fluid to be filtered are removed or captured when flowing out from the central channel 4 to each peripheral channel 5, and the removed or captured solids, etc. are blocked by the plug member 6. It is sequentially deposited in the central channel 4.

The usage example shown in FIG. 5 has a stopper 8 in the center that closes the open end of the central flow path 4, and forms a cap 7 that can open only the open end of each peripheral flow path 5. This cap 7 is placed on one end of the tubular body 2, and its function is the same as that shown in FIG. 4.

The tubular filter 1 shown in FIG. 6 has a peripheral flow path 5 located on one side (fluid inlet side) of the tubular body 2 whose opening is closed by a ring-shaped plug member 10, and a central flow path located on the same side. Although the opening end of the tubular body 2 is left open, if the diameter of the tubular body 2 is small, the opening on the inlet side of the peripheral flow path 5 can be heated and melted without using a special plug member 10. It may be occluded by doing so.

The tubular filter 1 shown in FIG. 7 opens only the opening of the central channel 4 located on one side (fluid inlet side) of the tubular body 2, and opens the entire opening of the peripheral channel 5 located around it. A cap 11 having a stopper 12 that can be covered is used.

The tubular filter 1 shown in FIG. 8 closes the peripheral flow path 5 on the fluid inlet side of the tubular body 2 with a plug member 10 to open the central flow path 4, and also closes the central flow path 4 on the fluid outlet side. Only the outlet side of one peripheral flow path 5 is opened by closing it with the plug member 6, and the fluid to be filtered flowing in from the central flow path 4 on the inlet side is passed through the peripheral flow path 5.
The fluid to be filtered is as shown by the arrow.

The microsolids flow in from the central channel 4, are dammed at the openings of the slit grooves 5, and are discharged from the peripheral channel 5, thereby efficiently removing or trapping the microsolids.

Note that the plug members that close the central flow path and the peripheral flow paths do not necessarily need to be placed at the entrance and exit of the tubular body, and may be placed at different positions in the axial direction.

The tubular filter 1 shown in FIG. 9 has an attached outlet pipe 14 bent in an inverted shape attached to the fluid outlet side of the tubular body 2, and an attached outlet pipe 14 that passes through the attached outlet pipe 14 and is inscribed in the central flow path 4. A wet piston 13 is provided.

This piston 13 is inserted into the central passage 4 to close the central passage 4 of the tubular filter 1. By inserting the piston 13 into the central passage 4, the central passage 4 is closed during filtration. The purpose is to remove minute solids deposited on the filter from the inlet of the fluid to be filtered.

The tubular filter 41 shown in FIG. 10 includes a tubular filter 41a with a large diameter and a tubular filter 41 with a small diameter.
A small-diameter tubular filter 41
b is inserted into the large-diameter tubular filter 41a, and maintains the spacing by bringing a plurality of fin-like spacers 46 integrally formed on the wall of the tubular filter 41b into contact with the protrusions 43a of the tubular filter 412. be.

The tubular filter 41 having this structure is
The fluid to be filtered is caused to flow through the central flow path 44a of the filter a and the central flow path 44b of the tubular filter 41b, and the peripheral flow paths 45a,
45b, and by arranging not only such a double pipe but also a large number of tubular filters concentrically, the throughput of the fluid to be filtered can be increased. By using particles with different numbers and shapes, it is possible to easily and reliably separate fine solids with a wide particle size distribution.

Note that 423 and 42b in Figure 1 are tubular filters 41a and 4.
1b, and 43b indicates a protrusion of the tubular filter 41b.

Although not shown, it is also possible to bundle a number of single tubular filters so that the fluid to be filtered flows through each central channel and the filtrate is discharged through the peripheral channels.

Next, data will be shown when a liquid containing glass beads as the filtered object was treated under the following conditions using a thermoplastic synthetic resin tubular filter having the cross-sectional shape shown in FIG.

(11 Tubular filter material: Polyacecool copolymer Dimensions: Outer diameter 1.50mφ Inner diameter
0.45mφ Slit 0.45~0.49φ Number of slits 15 Slit size 27μmm Configuration Two-person side The inlet side of the peripheral flow path is melt-sealed.

Open the entrance part of the central flow path state.

Outlet side: Open the outlet side of the peripheral flow path.

Blocking the exit part of the central flow path state.

(2) Test liquid Glass pea dispersion (1 g of glass peas in 100 mJ of water)
) was used.

The particle size distribution of glass peas is shown in FIG.

(3) Test method: Attach a syringe to the outlet side of the tubular filter, immerse the inlet side in the well-stirred test liquid, suck it up, and measure the particle size of the glass beads flowing out from the outlet side of the tubular filter using an optical measuring device. The particle size distribution of unfiltered glass peas was investigated.

The particle size distribution according to the test results was as shown in FIG.

Comparing the results shown in FIG. 12 with the particle size distribution shown in FIG. 11 before glass bead filtration, it can be seen that glass beads of large particle size are separated very efficiently.

〔Effect of the invention〕

The tubular filter of the present invention has a plurality of protrusions extending in the axial direction at predetermined intervals on the inner circumferential wall of the tubular body. In addition to providing a plurality of peripheral channels consisting of slit grooves,
Since the central flow path surrounded by the tips of the plurality of protrusions is formed in the center of the tubular body, if the fluid to be filtered containing minute solids etc. is passed through the tubular body, the central flow path is formed. In the peripheral flow path, minute solid matters contained in the fluid to be filtered can be simply and easily removed or captured.

A tubular filter is the type of fluid to be filtered.

By appropriately selecting the shape of the tube length, tube diameter, central flow path 2 peripheral flow path, etc., depending on the amount of fine solids contained, etc.
It is possible to efficiently remove or collect minute solids in the fluid to be filtered.

Moreover, since this tubular filter has a tubular outer shell, it can be easily and easily incorporated into the flow path, and can be used without special fixing devices, so it can be used easily when opening an injection ampoule. It can be advantageously used to remove glass fragments that fall into liquids, certain types of fine particles contained in blood, and to remove or collect fine dust or mist-like droplets contained in gas. can.

[Brief explanation of the drawing]

FIG. 1 shows an example of a tubular filter of the present invention,
(a) is a partially cutaway side view, and (b) is a longitudinal sectional view thereof. FIGS. 2 and 3 are longitudinal sectional views showing other embodiments of the tubular filter of the present invention. FIG. 4 shows how the tubular filter of FIG. 1 is used,
(a) is a partial side view with a portion cut away, and (b) is a longitudinal sectional view. FIGS. 5 to 7 show other ways of using the tubular filter, and in each figure (a) is a partial side view with the negative portion cut away, and (b) is a longitudinal sectional view. FIGS. 8 and 9 are partially cutaway side views showing an example of the use of the tubular filter of the present invention. FIG. 10 shows another structural example of the tubular filter of the present invention, (a) is a partially cut away side view, (b)
is a vertical sectional view. FIG. 11 shows the particle size distribution of glass peas in the fluid before filtration in the example, and FIG. 12 shows the particle size distribution of glass peas that passed through the tubular filter during filtration.

Claims (2)

[Claims] (1) A slit is formed on the inner circumferential wall of the tubular body by forming a plurality of protrusions whose tips extend in the axial direction at predetermined intervals along the axial direction. In addition to forming a plurality of peripheral channels consisting of grooves, a central channel surrounded by protrusions is formed in the center of the tubular body, and the fluid in the central channel or the peripheral channel is transferred to the peripheral channel or the central channel. A tubular filter characterized in that it is configured to remove or capture microscopic solids contained in a fluid by causing it to flow out. (2) The tubular filter according to claim 1, characterized in that the tubular filter is configured to close either the central flow path or each peripheral flow path. (3) The tubular filter according to claim 1, wherein A tubular filter characterized in that it is configured to close both a flow path and each peripheral flow path at different positions.