JPH0346825Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a porous filter mesh made from a plurality of members of the same shape.

BACKGROUND OF THE INVENTION Many filter devices, particularly those used in industry, include a conduit or housing and a rigid or semi-rigid filter element housed within the conduit or housing. As an example, many of these filter elements have a generally cylindrical shape and include an inlet end;
Fluid flows into it. A filtration effect occurs as the fluid passes through the radial surface of the filter element. It will be appreciated that the limiting action of the filter element creates a pressure differential across it, which the filter element must withstand. Moreover, this differential pressure takes a particularly large value in a high flow rate environment or a high fluid pressure environment.

Many filter elements include a structural filter mesh to directly collect particulate matter contained in the fluid or to support porous filter materials such as crossbags. . The cloth bag may be formed from a variety of cloths, often using polyethylene fibers, for example, and is generally constructed with a special weave pattern and filtering capabilities. Other special problems arise when structural filter meshes are used to support such cross filter materials. Because of the differential pressure acting on the cloth, the cloth twists and enters the orifice of the filter mesh, blocking the mesh and thereby preventing or disabling effective operation of the filter device. Additionally, these problems become significant in high flow or high fluid pressure environments.

A number of filter mesh structures have been developed which minimize such blockage problems when used in combination with flexible filters under special conditions. These meshes are typically woven from wire and formed into the desired shape by cutting or welding as necessary. Thus, woven filter meshes have the disadvantage that they generally do not have sufficient structural strength necessary for use in many applications unless supported by auxiliary mechanisms. Also, the material required to form a mesh of a given size or porosity may not be a material suitable for forming a mesh of the desired structural properties.

Accordingly, the present invention consists of a plurality of similar components that are formed to constitute a filter mesh of a desired shape, such that such mesh has a generally rigid structure over a wide range of mesh patterns and mesh grades. To provide a filter mesh that can configure a filter mesh.

(Means for Solving the Problems) The filter mesh of the present invention has a plurality of mesh rings arranged and held in a stacked manner in the axial direction,
Each mesh ring includes a generally flat ring-shaped main body portion and a plurality of ribs protruding from the top, bottom and inner surfaces of the main body, each rib having an arcuate surface toward the inside of the ring-shaped main body. None, the ribs are configured to be symmetrically spaced along arcuate segments of the ring-shaped body member.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

The filter device 10 shown in FIG.
2, the housing 12 is preferably generally cylindrical and constructed of a relatively rigid material capable of withstanding the pressures and other conditions of the intended environment. The housing 12 has an inlet 14
and an outlet 16 through which fluid enters and exits the filter device 10, respectively. Housing 1
2 is closed at the first end 18 by an end cap 20 having a wedge-shaped annular seal. 1st end seal 2
0 includes a ring body 22 and a flexible annular seal 24
and a wedge block 26. Wedge block 26 is secured in place to housing 12 by a plurality of pins (not shown) extending between these members. A plurality of bolts 27 extend through ring block 24 and into wedge block 26 to facilitate drawing these two members together into increasingly closer relationship. A flange 28 extending downwardly along the outer periphery of the ring body 22 fits into a groove 30 disposed along the outer periphery of the wedge block 26, within which the annular seal 24 is disposed. The lower surfaces of each of the groove 30 and the annular seal 24 have complimentary, interengaging tapered surfaces so that the groove 30 and the annular seal 24 have complementary, interengaging tapered surfaces so that the groove 30 and the annular seal 24 are rotated as the bolt 27 is rotated to pull the ring body 22 and the wedge block 26 toward each other. The tapered surface of 24 is configured to push the annular seal 24 radially outwardly into sealing engagement with the inner surface 32 of the housing 12.

A second end seal 34 is secured to the second end 36 of the housing 12 in a manner similar to that described for the first end seal 20. As discussed in more detail below, the wedge block 38 of the second end seal defines a recess 40 therein. Also, as discussed further below, it is often desirable for the recess 40 to be connected to the exterior of the filter device 10 by a sealable hole 42.

Referring now to FIGS. 1 and 2, filter element 44, shown in perspective view in FIG. an inlet opening 50 including threads or other suitable means;
A hole 52 extends to the top surface 54 of the mounting block 46. Preferably, the hole 52 extends along the outer periphery of the mounting block 46 along an arc that is less than a semicircular arc. Mounting block 46 also includes an outlet passageway 56 consisting of an outlet hole 58 containing threads or other means for connecting to a conduit, and a hole 60 extending to the lower side 62 of mounting block 46.
Hole 60 preferably extends along the outer circumference of mounting block 46 along an arc of less than a semicircular arc. The partially arcuate holes 52 and 60 maintain the cross-sectional area of the liquid flowing into and out of the filter device 10. By forming the holes 52 and 60 in the shape of an arc of less than a semicircular arc, these holes can be arranged along an arc of the same length of the mounting block. Mounting block 46 also includes upper and lower vertical circumferential grooves 64 and 66, respectively. The central portions of these grooves 64 and 66 are connected to the upper wedge block 2.
6 and a tapered surface similar to the groove of the lower wedge block 38. Disposed within each groove 64 and 66 is a flexible annular seal 68 and 70, respectively. These seals are arranged to cooperate with the tapered surfaces of grooves 64 and 66, respectively. Upper and lower ring bodies 72 and 74 are bolted to the mounting block 46, respectively. Mounting block 46
There is no need to provide a pin to hold it in place.
This is because, unlike the end seals 20 and 34,
This is because the mounting block 46 is supported by hydraulic pressure from both sides thereof. Any offset during hydraulic pressure will be applied to the inside of the mounting block 46 and the filter element 4
4 toward the fixed position.

A plurality of rods 76 are screwed into the lower surface 62 of the mounting block 46, and the rods 76 are equally spaced along a predetermined arc around the outer circumference of the mounting block 46. A plurality of mesh rings 78 are threaded over these rods 76 in a stacked manner. These mesh rings are described in further detail with respect to FIGS. 3 and 7. Attached to the rod 76 at the lower end of the stack of mesh rings 78 is a bottom cap 80 which preferably has a solid upper surface 82 for the mesh ring stack and which preferably has a cylindrical shape. A block 84 extends below it. As discussed in more detail below, it is often desirable for block 84 to have a downwardly opening recess 86 in its center and a plurality of holes 88 extending from recess 86 to the exterior of block 84.

In the particular application of filter element 44, a porous filter element, such as a filter bag 89, is placed within the stack of mesh rings 78 in a manner known in the art. The bag 89 is held in place by a wire ring 101 that is fixed to or integral with the bag. This wiring ring 101 rests on the shoulder 103 inside the hole 63 of the mounting block 46.

Referring now to FIG. 3, a top view of a single mesh ring 78 is shown. The mesh ring 78 as a whole preferably includes an outwardly directed ledge 88 surrounding a hole 90 through which the rod (76 in FIGS. 1 and 2) is inserted. Preferably, a plurality of ribs 92 extend above and below the body 94 of mesh ring 78 . In one preferred embodiment, these ribs are equally spaced along each semi-circular arc portion of mesh ring 78, but in other embodiments, ribs 92 are spaced evenly along each semi-circular segment of mesh ring 78, as will be apparent from the description below. Other spacings may be preferred. When mesh ring 78 is viewed along diameter A-B,
A plate 95 including orientation recesses 96 and tabs (98 in FIG. 5) is positioned radially adjacent ledges A and B. Also, the first rib 92 when viewed counterclockwise from A on a business trip is the plate 9.
5 is located at a distance X from the adjacent edge of 5. Turning further counterclockwise, the remaining rib 92 is moved a distance 3X from the nearest edge of the leading rib 92 in this embodiment.
It is located in If we now start from ledge B and move counterclockwise, the nearest rib 92 will be located a distance 3X from the nearest edge of the plate 95. The remaining ribs 92 in this second semicircular arc of mesh ring 78 are likewise a distance 3X from the nearest adjacent edge of each preceding rib 92.

It will be appreciated that each rib 92 preferably exhibits a generally rectangular shape when viewed from a position above or below the mesh ring 78 proximate the ring axis. Within the scope of the present invention,
Of course, other shapes of ribs 92 can be used effectively. For example, the ribs 92 can be formed to have an overall trapezoidal shape when viewed from above or below. In that case, the wider of the two parallel sides of the trapezoidal ribs can be placed outside the mesh ring 78 to define a rectangular flow path between adjacent ribs 92, or, for example, the larger side of the trapezoidal rib can be placed outside the mesh ring 78. Located inside the 78,
Filter channel geometries can be made that are associated with filter materials commonly referred to in the art as wedge wire.

Referring now to FIG. 4, this is a cross-sectional view taken along line 4--4 of FIG. 3 showing the outline of the preferred rib 92 shape. In this preferred embodiment, the inner ends 100 of the ribs 92 are arcuate to provide an arcuate or rounded shoulder on the inside of the mesh ring 78. Note that the ribs 92 preferably extend an equal distance above and below this portion of the mesh ring 78.

Referring now to FIG. 5, this is a cross-sectional view of mesh ring 78 taken along line 5--5 of FIG. 3, showing plate B. Directly below the orientation recess 96 is an orientation tab 98 . The height 102 of plate B is approximately equal to the height of each rib 92.

Referring now to FIGS. 4 and 6, FIG. 6 shows the configuration of a portion of a stacked assembly of three mesh rings 78. For clarity of illustration each ring 7
At 8 only a few ribs 92 are shown. A rib 92 of the center mesh ring 78B is interposed between the vertically aligned ribs 92 of the upper and lower mesh rings 78A and 78C. Such interposition or offset in the mesh ring assembly is achieved by having vertically adjacent rings 180 degrees out of phase with respect to each other. That is, it is carried out by placing plate B on top of plate A of the rings to be stacked, and placing plate A on top of that. Rib interposition occurs due to the asymmetric spacing of the ribs between the two halves of mesh ring 78 as described above.

FIG. 7 is an enlarged view of the mesh structure of the filter according to the present invention shown in FIG. Ignoring the depth of the ribs 92, one can see the effective mesh structure for fluid flow inside this filter.

As will be apparent to those skilled in the art, mesh ring 7
Many materials can be used for the construction of 8. For most applications, a moldable material such as plastic, optionally filled with fibers, is suitable for the mesh ring 78;
It would also be the most suitable material in terms of price.

It will be appreciated that the shape of the mesh ring 78 shown in this preferred embodiment may be varied in many ways without departing from the spirit of the invention. Additionally, while the illustrated mesh pattern is a particularly preferred embodiment, other mesh patterns known to those skilled in the art may be used by making appropriate changes in the construction of the mesh ring, particularly in the shape or size or arrangement of the ribs 92 on its body 94. It is clear that it can also be constructed mechanically.

Referring again to FIG. 1, filter element 4
When 4 is fully assembled, mesh ring 7
8 and a bottom plate 80 are secured to the rods 76 by nuts, forming a rigid unit as a whole. Filter element 44 is slid into housing 12, excluding first end cap 20. Block 8 of bottom cap 80
4 into the recess 40 of the lower wedge block 38, and the filter element 44 can be inserted into the housing 12 until the block 84 is securely seated within the recess 40. Inlet hole 48 then aligns hole 14 and outlet hole 58 aligns hole 16.
Filter element 44 is rotated within housing 12 until it is aligned with . When filter element 44 is properly positioned, bolts 79 passing through upper and lower mounting rings 72, 74 and mounting block 46, respectively, are tightened and bolts 79 pass through upper and lower mounting rings 72, 74 and mounting block 46, respectively. bolt 79 is tightened to bring sealing rings 68 and 70 (FIG. 2) into sealing engagement with inner surface 36 of housing 12 by pulling upper and lower mounting rings 72 and 74 toward center block 46. let Filter element 44 inside housing 12
The location of is limited only by the alignment of holes 48, 58 in the mounting block and holes 14, 16 in housing 12. By forming the holes 14 and 16 in the housing 12 in a longitudinal oval shape, a wide adjustment range is easily obtained.

During operation of filter device 10, fluid flow is directed through inlet passageway 48, as seen by the arrows indicating fluid flow.
the fluid enters and flows to the upper end of the mounting block 46 and then downwardly through the hole 63 to a position near the deposit of the mesh ring 78 where the fluid passes through the filter bag 89 and the mesh ring 78 and surrounds the filter element 46. It flows into the flow path 105.
Fluid then enters hole 60 and exits filter device 10 through outlet hole 56.

In many applications, it is desirable to provide a means for cleaning or blowing down the filter device. In the illustrated embodiment, this is hole 4
This is easily accomplished by removing plug 107 in block 84 to allow fluid to pass through hole 88 and recess 86 in block 84 and to drain accumulated sludge or granular material from filter device 10.

Now referring to FIG. 8, the filter device 1
Fifty other embodiments are shown. Since the essential functions of each element are the same as those described in the previous embodiments, only relevant differences will be described. An introduction fitting 160 is seen secured to the exterior of the housing 162. Similarly, an outlet hole 164 is located within the second end wedge block 166. Therefore the mounting block 16
8 has only a longitudinal central hole 170 without the introduction and exit holes of the previous embodiments. moreover,
Because of this difference in input/exhaust structure, mounting block 166 does not require the two upper and lower annular seals of the previous embodiment. Therefore the mounting block 16
6 has only one groove 167 and cooperates with only one ring 168. The mesh ring 78 is deposited on the ring body 1 rather than on the mounting block 166.
It can be seen that it is connected to 68. The annular seal surrounding the mounting block 166 is similar to the first end cap (20 in FIG. 1) of the previously described embodiment.
It is tightened in the same manner as described above. The bottom plate is longer than in previous embodiments, and the extended struts 1 provide minimal restriction to fluid flow toward the outlet holes 164.
74 is preferred. Also, since there are no constraints on the alignment of the holes within the housing, the filter element 175 can be placed at any desired longitudinal location within the housing 162. It will also be appreciated that by increasing or decreasing mesh ring 78 as desired in this manner, adjustment of the length of the filter element may be easily effected. Therefore,
The filter element can be adjusted in response to different external conditions or environments without changing the filter housing.

FIG. 9 is a plan view of the filter device of FIG. 8, showing its overall shape, and also shows the upper end seal 1.
Tightening bolt 1 fixing 74 to housing 162
72 is shown. Also shown is a pin 175 extending between the housing 162 and the upper end seal wedge block 179.

The operation of this modified embodiment is similar to that described for the previous embodiment. Fluid enters filter device 150 through inlet fitting 160;
It enters the hole 170 inside the mounting block 166, enters the passageway 176 through the mesh ring 78, and exits the filter device 150 through the outlet hole 164.

The present invention is not limited to the above description, and may be modified or implemented as desired within the scope of the spirit thereof.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a filter device incorporating the filter mesh of the present invention, and FIG. 2 is a perspective view showing the assembly of filter elements of the filter device of FIG.
3 is a plan view of a single mesh ring of the filter element of FIG. 2; FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3; and FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 6 is an inside perspective view of an assembly of three mesh rings, FIG. 7 is an enlarged view of the mesh of the ring assembly of FIG. 6, and FIG. 8 is an illustration of another embodiment of the present invention. The sectional view, FIG. 9, is a plan view of the filter device of FIG. 8. 78... Metsushu ring, 88... Business trip, 9
0...hole, 92...rib, 94...ring body,
95...Orientation plate, 96...Orientation recess, 9
8...Tab, 100...Inner end.

Claims (1)

[Scope of utility model registration request] It has a plurality of mesh rings arranged and held in an axial stack, each mesh ring having a generally flat ring-shaped main body portion and a plurality of ribs protruding from the upper surface, lower surface and inner surface of the main body portion. , wherein each rib has an arcuate surface toward the inside of the ring-shaped body portion, and the ribs are symmetrically spaced along arcuate segments of the ring-shaped body portion.