JPH0233851Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention provides a strainer for reliably filtering impurities by passing a fluid containing impurities to be removed through a plurality of filter bodies. The present invention relates to a multi-stage strainer that prevents clogging and allows filtering of impurities over a long period of time without maintenance such as cleaning of the filter body.

(Prior Art and its Problems) In order to remove impurities from a fluid, a strainer using a plurality of filter bodies with different meshes has been proposed (Japanese Utility Model Publication No. 13664/1983).
Although the strainer is relatively effective in terms of removing impurities, as it is used, the mesh of the filter body becomes clogged, and in order to remove the clogged impurities, the device must be disassembled and each filter body replaced. This has the disadvantage that the replacement greatly reduces work efficiency.

(Purpose of the invention) The present invention is an apparatus for removing impurities from a fluid using a plurality of filter bodies, and the present invention removes impurities clogged in the mesh of the filter bodies while performing a filtration operation without taking any special measures. The purpose of the present invention is to provide a multi-stage strainer that can be used for a long period of time without removing or disassembling the device.

(Means for Solving the Problems) The present invention has a plurality of cylindrical filter bodies concentrically arranged on a bottom plate, and the upper ends of the filter bodies are connected to each other by a top plate having a hole in the center. The process fluid is housed in a cylindrical strainer body and is supplied at a constant speed from a fluid supply port attached to the strainer body so as to face tangentially to form a spiral or spiral fluid. The fluid contacts the innermost filter body of the plurality of filter bodies at an angle other than a right angle, and after passing through the plurality of filter bodies sequentially, the fluid contacts the innermost filter body of the plurality of filter bodies, and then passes through the plurality of filter bodies sequentially. This is a multi-stage strainer that allows treated fluid to be taken out laterally.

The present invention will be explained in detail below.

In the present invention, by supplying the processing fluid to the strainer body from the tangential direction, the processing fluid swirls in the space above the top plate to form a spiral or spiral flow, and as it flows, multiple It is characterized by being made to pass through a filter. Therefore, the processing fluid passing through the filter does not come into contact with the filter at a right angle, but passes through it at a certain angle and at a relatively high speed. It is possible to clear the blockage by peeling it off.

A technique for supplying processing fluid from the tangential direction has been known (Japanese Utility Model Publication No. 49-62264), but in this technique, fluid is supplied to the outermost part of a cylindrical body divided into a plurality of parts, and the fluid is supplied to the innermost part The structure is clearly different from the structure of the present invention because the structure is such that the fluid comes into contact with the surface that is not clogged.

When the processing fluid is supplied tangentially to the strainer according to the present invention, the supplied fluid swirls on the top plate of the strainer to form a spiral flow, and the flow flows from the hole in the center of the top plate to the innermost It moves into the filter body, contacts the filter body in a spiral shape, strips off the impurities that clog the mesh of the filter body, deposits them on the bottom plate, passes through the filter body, and then sequentially removes impurities from the mesh of the filter body and deposits them on the bottom plate. The mesh is cleaned of impurities and passed through the outermost filter to remove the treated fluid to the side of the strainer body.

In this case, it is preferable to make the mesh of the plurality of filter bodies finer toward the outside, since impurities are removed in order from the largest diameter.

Furthermore, if the viscosity of the processing fluid is high, it becomes difficult for the fluid to pass through the filter, prolonging the processing time, and causing clogging of the filter. Therefore, in the present invention, a heating fluid flow path may be formed around the strainer body to heat the strainer body and reduce the viscosity of the processing fluid.

A preferred embodiment of the strainer according to the present invention will be described below with reference to the accompanying drawings, but the present invention is not limited to this embodiment.

(Example) FIG. 1 is a longitudinal cross-sectional view showing an example of a strainer according to the present invention, and FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1.

Reference numeral 1 denotes a strainer main body with an open top surface and a side surface connected with a fluid supply port 2 containing impurities in the tangential direction.The lower part of the main body 1 is gently inclined toward the center and bent downward at the center A fluid outlet 3 is formed. Reference numeral 4 denotes an outer wall formed on the side and below the main body 1, and between the outer wall 4 and the main body 1, a flow path 5 for heating fluid is formed. Reference numeral 6 indicates a leg body fixed to the lower side of the outer wall 4 and supports the strainer main body 1.

7 are four notch grooves 8, 8', which are circular in plan view;
It is a disc-shaped bottom plate with grooves 8, 8', 8'', 8 cut out in the bottom plate 7, and four cylindrical filter bodies 9, 9' with different diameters are installed in each notch groove 8, 8', 8'', 8 of the bottom plate 7. , 9'', 9 are fitted at the lower ends of each filter body 9, 9', 9'', 9.
For example, it is composed of a net-like body having a filtering function, a lattice-like reinforcing body closely attached to the inside of the net-like body, and a protective body consisting of a plate having circular holes closely attached to the outside of the net-like body. It may be a complex etc.
The mesh of each filtration body follows the fluid flow, in this embodiment, as it goes in the circumferential direction.
It is preferable to make it fine. The upper end of each filter body has a circular hole 10 bored in the center, and is fitted into notch grooves 12, 12', 12'', and 12 cut in the lower surface of the top plate 11 that slopes toward the center. The peripheral edge of the top plate 11 is placed and fixed on the inward flange 13 of the main body 1.14
1 is an upper cover provided on the upper end of the main body 1 via a packing 15, and the upper cover 14 is fixed to the main body 1 with tightening bolts 16.

In this embodiment, when a fluid containing impurities is supplied from the supply port 2 to the main body 1 in a tangential direction, the fluid flows along the inclined surface of the top plate 11 while swirling.
It flows from the circular hole 10 between the top plate 11 and the bottom plate 7.
In this case, since the fluid is swirling at a relatively high speed, it collides with the surface of the filter body 9 at a certain angle,
Impurities stuck in the mesh on the surface of the filter are peeled off and deposited on the bottom plate. Also, the innermost filter body 9
The mesh is rougher than that of other filters, so relatively large impurities are removed. In each successive filter element 9', 9'', 9, impurities of a size suitable for each mesh are removed.In this way, since impurities are removed by a total of four filter elements, the filtration efficiency is maximized. In addition, clogging of the filter body is minimized, and impurities clogging the mesh are removed from the filter surface by the fluid swirling in a spiral direction. It becomes possible to use it for filtration operations without causing clogging.

Furthermore, when the heated fluid is flowed through the flow path 5, the viscosity of the fluid containing impurities is reduced, so that the filtration efficiency is increased and clogging is more reliably prevented. The fluid from which impurities have been removed in this way is taken out from the outlet 3 to the outside.

(Effect of the invention) In the present invention, a plurality of filter bodies are arranged concentrically and housed in a strainer body, and a processing fluid is supplied to the strainer body from a tangential direction to cause the fluid to flow in a spiral shape. , which is brought into contact with the plurality of filter bodies at a certain angle and allowed to pass through.

Therefore, impurities clogging the mesh of the filter are removed by the fluid that comes into contact with the mesh at a certain angle and passes through it.In other words, the filtration operation and the removal of impurities from the surface of the filter can be performed simultaneously. This eliminates the need to perform the removal operation alone.
Furthermore, the conventional method eliminates the complicated operation of dismantling the strainer itself and replacing the filter every time it becomes clogged.

Furthermore, in the present invention, a heated fluid flow path may be provided around the strainer body, thereby reducing the viscosity of the processing fluid, increasing the filtration efficiency, and more effectively suppressing clogging of the filter body. becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of a strainer according to the present invention, and FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1... Strainer body, 2... Supply port, 3...
Exhaust port, 4... Outer wall, 5... Channel, 6... Leg body,
7... Bottom plate, 8... Notch groove, 9... Filter body, 10
...Round hole, 11 ... Top plate, 12 ... Notch groove, 13
...flange, 14...top cover, 15...packing, 16...bolt.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A plurality of cylindrical filter bodies are installed concentrically on a bottom plate, and the upper ends of the filter bodies are connected to each other by a top plate having a hole in the center to form a cylindrical filter body. The processing fluid is supplied at a constant speed from a fluid supply port housed in the strainer body and attached so as to face tangentially to the strainer body to form a spiral or spiral fluid, and the fluid flows through the plurality of The strainer comes into contact with the innermost filter body at an angle other than a right angle, passes through the plurality of filter bodies sequentially, and is then processed from the outermost filter body to the side of the strainer main body. A multi-stage strainer that allows fluid to be extracted. (2) The multi-stage strainer according to claim 1, wherein a flow path for the heated fluid is formed in the outer wall of the strainer body.