JP2023006720A - Relief valve for fluid filter and fluid filter including the same - Google Patents

Abstract

To provide a relief valve for a fluid filter which can achieve simplification of its structure by significant reduction of the number of components.SOLUTION: A relief valve 4 includes: a valve part 23 which is formed in an umbrella-shape having a center hole 23a and makes pressure contact with a shaft end surface of a housing 2; passage parts 24 each of which is disposed at the outer side of the valve part and allows a fluid to circulate along an outer periphery surface of the valve part; protruding parts 25 each of which is disposed at the outer side of the valve part and makes pressure contact with the shaft end surface of the housing; and an annular element pressing part 26 which is disposed at the outer side of the valve part and makes pressure contact with a shaft end surface of a filter element 3 by pressing force of the protruding parts. The valve part, the passage parts, the protruding parts, and the element pressing part are integrally formed by an elastic material.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a relief valve for a fluid filter and a fluid filter including the same, and more particularly, it is arranged between the axial end side of a cylindrical housing and the axial end side of a filtering element housed in the housing. The present invention relates to a relief valve for a fluid filter and a fluid filter including the same.

As a conventional relief valve, for example, as shown in FIG. A relief valve 104 for an oil filter is generally known (see Patent Document 1, for example). The relief valve 104 includes a metal support spring 135 that presses against the axial end surface of the housing 102 and the axial end surface of the filter element 103 to support the filter element 103, and a resin valve that can open and close the central hole 135a of the support spring 135. 136, a metal lock plate 137 attached to the upper end of the resin valve 136, and a metal coil spring 138 disposed between the lock plate 137 and the support spring 135 to bias the resin valve 136 in the closing direction. and have. The relief valve 104 isolates the inside of the housing 102 into the upstream space S1 and the downstream space S2 of the filter element 103, and when the pressure difference between the upstream space S1 and the downstream space S2 reaches or exceeds a predetermined value, , the upstream space S1 and the downstream space S2 are communicated by displacing the resin valve 136 against the biasing force of the coil spring 138 .

JP 2003-117316 A Japanese Patent Application Laid-Open No. 2001-29712 Japanese Utility Model Laid-Open No. 61-135514

However, since the conventional relief valve 104 is composed of four parts, that is, a metal lock plate 137, a metal support spring 135, a metal coil spring 138, and a resin valve 136, the number of parts is increased. It requires a lot of man-hours for assembly and processing for each part. In addition, there are three metal parts, and the weight is heavy. Furthermore, it takes a lot of sorting man-hours for disposal.

Here, Patent Literatures 2 and 3 disclose relief valves that aim to reduce the number of parts. However, these employ a leaf spring as the valve body, and furthermore have an auxiliary part separate from the valve body.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a relief valve for a fluid filter that can greatly reduce the number of parts and simplify the structure, and a fluid filter having the same. and

In order to solve the above problems, the invention according to claim 1 provides a fluid filter disposed between the axial end side of a cylindrical housing and the axial end side of a cylindrical filter element accommodated in the housing. A relief valve for a filter, comprising: a valve portion formed in an umbrella shape having a central hole and pressed against an axial end surface of the housing; a passage portion for circulating the filter element, a convex portion arranged outside the valve portion and pressed against the axial end surface of the housing, and an axial end surface of the filtration element arranged outside the valve portion by the pressing force of the convex portion The valve portion, the passage portion, the convex portion, and the element pressing portion are integrally formed of an elastic material, and the relief valve moves the inside of the housing through the The upstream space and the downstream space of the filtration element are separated from each other, and when the pressure difference between the upstream space and the downstream space reaches a predetermined value or more, the valve portion collapses inward to separate the upstream space. and the downstream space are communicated with each other.
The gist of the invention according to claim 2 is that in the invention according to claim 1, a recess is provided in which the tip end side of the support tube that constitutes the filter element is fitted.
The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the valve part has a gradually changing part whose wall thickness gradually decreases toward the axial end surface of the housing. .
The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein a plurality of the convex parts are provided at predetermined intervals around the axis of the valve part, and the passage part is constituted by notches between the adjacent protrusions.
In order to solve the above problem, the invention according to claim 5 is a fluid filter comprising the relief valve for a fluid filter according to any one of claims 1 to 4.

According to the relief valve for a fluid filter of the present invention, the valve portion is formed in an umbrella shape having a central hole and press-contacts with the axial end surface of the housing, and the valve portion is arranged outside the valve portion so that the fluid flows along the outer peripheral surface of the valve portion. a passage portion for circulating the fluid, a convex portion arranged outside the valve portion and pressed against the axial end surface of the housing, and an annular ring arranged outside the valve portion and pressed against the axial end surface of the filter element by the pressing force of the convex portion. and an element pressing portion, wherein the valve portion, the passage portion, the convex portion, and the element pressing portion are integrally formed of an elastic material. The relief valve isolates the interior of the housing into an upstream space and a downstream space of the filter element, and the valve portion collapses inward when the pressure difference between the upstream space and the downstream space exceeds a predetermined value. This allows the upstream space and the downstream space to communicate with each other. As a result, the number of parts of the relief valve can be greatly reduced, and the structure can be simplified. As a result, it is possible to reduce the man-hours for assembling the relief valve, the man-hours for processing, and the man-hours for sorting disposal, and also reduce the weight of the relief valve.
In addition, when the tip end side of the support tube that constitutes the filter element is provided with a recessed portion to be fitted, it is possible to prevent the relief valve from coming off the filter element. Furthermore, the filter element and the relief valve can be handled as an integrated unit by fitting the tip side of the support cylinder into the recess, and the assembly of the fluid filter is excellent.
Further, when the valve portion has a gradually changing portion whose wall thickness gradually decreases toward the axial end surface of the housing, the sealing performance and elastic deformability of the valve portion are enhanced.
Further, when a plurality of the convex portions are provided around the axis of the valve portion at predetermined intervals, and the passage portion is formed by notches between the adjacent convex portions, the passage portion and the Protrusions can be easily formed.
According to the fluid filter of the present invention, since the relief valve for the fluid filter is provided, the number of parts of the relief valve can be greatly reduced and the structure can be simplified. As a result, it is possible to reduce the man-hours for assembling the relief valve, the man-hours for processing, and the man-hours for sorting disposal, and also reduce the weight of the relief valve.

The present invention will be further described in the following detailed description by way of non-limiting examples of exemplary embodiments according to the invention and with reference to the mentioned drawings, wherein like reference numerals indicate Similar parts are shown throughout the several figures.
BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing for demonstrating the oil filter which concerns on an Example, and shows the side view which made the cross section one side from the center line of an oil filter. It is a principal part enlarged view of FIG. 1, (a) shows the isolated state of the upstream side and downstream side space by a relief valve, (b) shows the communication state of the upstream side and downstream side space by a relief valve. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing for demonstrating the relief valve which concerns on an Example, (a) shows a top view, (b) shows sectional drawing on the bb line, (c) shows a perspective view. FIG. 10 is a cross-sectional view of a main part of a relief valve according to another embodiment; FIG. 11 is a cross-sectional view of a main part of a relief valve according to still another embodiment; It is explanatory drawing for demonstrating the conventional oil filter, (a) shows a general view, (b) shows a principal part enlarged view.

The material presented herein is intended to be illustrative and illustrative of the embodiments of the invention and is believed to be the most effective and readily understood description of the principles and conceptual features of the invention. It is stated for the purpose of providing what it seems. In this regard, no attempt is made to show structural details of the invention beyond those necessary for a fundamental understanding of the invention, and the description in conjunction with the drawings will illustrate some aspects of the invention. It will be clear to those skilled in the art how it is actually implemented.

<Relief valve for fluid filter>
For example, as shown in FIGS. A relief valve 4 for a fluid filter disposed between the shaft end side and the valve portion 23 formed in an umbrella shape having a central hole 23a and pressed against the shaft end surface of the housing 2, and the outside of the valve portion 23. a passage portion 24 arranged in the outer peripheral surface of the valve portion 23 for circulating fluid along the outer peripheral surface of the valve portion 23; and an annular element presser portion 26 that is arranged and pressed against the axial end surface of the filter element 3 by the pressing force of the projection 25. The valve portion 23, the passage portion 24, the projection 25, and the element presser portion 26 are made of an elastic material. integrally formed. The relief valve 4 isolates the inside of the housing 2 into the upstream space S1 and the downstream space S2 of the filter element 3, and when the pressure difference between the upstream space S1 and the downstream space S2 reaches or exceeds a predetermined value, , the upstream space S1 and the downstream space S2 are communicated with each other by tilting the valve portion 23 inward.

The shape, size, location, etc. of the valve portion 23 are not particularly limited. The valve portion 23 may be formed with a constant thickness, for example, but from the viewpoint of sealing performance, elastic deformation, etc., the gradually changing portion 31 whose thickness gradually decreases toward the shaft end surface of the housing 2 is used. (see FIG. 2).

The shape, size, location, etc. of the passage portion 24 are not particularly limited. The passage portion 24 may be configured by, for example, a through hole, but is preferably configured by a notch from the viewpoint of workability (see FIG. 3). Further, a plurality of passage portions 24 can be provided at predetermined intervals around the axis of the valve portion 23, for example.

The shape, size, location, etc. of the convex portion 25 are not particularly limited. For example, a plurality of protrusions 25 can be arranged around the axis of the valve portion 23 at predetermined intervals (see FIG. 3). In this case, for example, the passage portion 24 can be configured by a notch between adjacent convex portions 25 .

The shape, size, location, etc. of the element holding portion 26 are not particularly limited. The element pressing portion 26 can be brought into pressure contact with, for example, an annular seal portion 21 provided on the axial end surface of the filter medium 18 constituting the filter element 3 (see FIG. 2). Further, the element holding portion 26 can be arranged directly below the plurality of convex portions 25, for example. Thereby, the sealing property between the element holding portion 26 and the axial end surface of the filter element 3 is enhanced.

The relief valve 4 can have, for example, a concave portion 27 into which the distal end side of the support tube 4 constituting the filter element 3 is fitted (see FIG. 2). The recessed portion 27 is normally formed integrally with the valve portion 23, the passage portion 24, the projecting portion 25, and the element pressing portion 26 from an elastic material. Furthermore, the recessed portion 27 can be arranged, for example, between the valve portion 23 and the element pressing portion 26 .

The shape, size, material, etc. of the housing 2 are not particularly limited. The housing 2 normally includes a fluid inlet 11 communicating with the upstream space S1 and a fluid outlet 12 communicating with the downstream space S2.

The shape, size, material, etc. of the filtering element 3 are not particularly limited. The filter element 3 can include, for example, a tubular filter medium 18 and a tubular protector 19 that supports the inner peripheral side of the filter medium 18 and has a plurality of communication holes 19a formed therein.

Various synthetic rubbers such as nitrile rubber (NBR), silicone rubber (VMQ), fluororubber (FKM), and acrylic rubber (ACM) can be used as the elastic material forming the relief valve 4 .

<Fluid filter>
The fluid filter according to this embodiment includes the relief valve 4 for a fluid filter according to the above embodiment.
Examples of the fluid filter include an oil filter, a fuel filter, an air filter, and the like. Among these, it is suitably used as an oil filter for filtering oil used in engines of passenger cars, railroad vehicles, industrial vehicles, aircraft, agricultural machinery, construction machinery, and the like.

It should be noted that the reference numerals for each configuration described in the above embodiment indicate the corresponding relationship with the specific configuration described in the following examples.

Hereinafter, the present invention will be specifically described by way of examples with reference to the drawings. In addition, in this embodiment, a spin-on type oil filter that is assembled to an engine as a replacement part is exemplified as a "fluid filter" according to the present invention.

As shown in FIG. 1, the oil filter 1 according to the present embodiment includes a cylindrical housing 2, a cylindrical filter element 3 housed in the housing 2, and an axial end side of the housing 2 and the filter element 3. and a relief valve 4 arranged between the shaft end side.

The housing 2 includes a cylindrical metal case 6 with one shaft end open, and a metal reinforcement plate 7 provided to close the opening of the case 6 . The reinforcement plate 7 is provided with a cylindrical projection 7a at its central portion. A threaded portion 9 that can be fastened (screwed) with a union bolt 8a of the engine 8 is formed on the inner peripheral side of the protrusion 7a. Further, the inner side of the projection 7a constitutes an oil outlet 12 connected to a downstream space S2, which will be described later. A plurality of oil inlets 11 connected to an upstream space S1, which will be described later, are formed circumferentially at predetermined intervals on the outer peripheral side of the oil outlet 12 of the reinforcement plate 7 . Further, a check valve 13 for regulating the flow of oil from the upstream space S1 toward the oil inlet 11 is mounted on the outer peripheral side of the projection 7a.

A metal closure plate 15 is fixed to the bottom surface of the reinforcement plate 7 so as to surround the oil outlet 12 and the oil inlet 11 . The closure plate 15 is seamed around the periphery of the open end of the case 6 and welded to the reinforcement plate 7 . A gasket 16 for sealing between the closure plate 15 and the seat surface of the engine 1 is attached.

The filter element 3 includes a pleated tubular filter medium 18 and a tubular protector (support tube) 19 that supports the inner peripheral side of the filter medium 18 and has a plurality of flow holes 19a formed therein. An annular seal portion 21 is provided on the inner side of the axial end surface of the filter medium 18, with which an element pressing portion 26 of the relief valve 4, which will be described later, is pressed. Furthermore, the protector 19 has one axial end fitted into a recess 27 of the relief valve 4 (to be described later) and the other axial end fitted into a recess 13 a of the check valve 13 , so that the relief valve 4 and the check valve 19 are fitted. It is sandwiched between the valve 13 and the valve 13 .
As the filter material 18, nonwoven fabric, woven fabric, paper, or the like can be used. Furthermore, a filter medium 18 formed of a foam or a molded body may be employed instead of the pleated cylindrical shape.

The relief valve 4 according to this embodiment includes a valve portion 23, a passage portion 24, a convex portion 25, an element holding portion 26 and a concave portion 27, as shown in FIGS. These parts 23 to 27 are integrally formed (specifically integrally molded using a mold) from an elastic material (eg, nitrile rubber).

The relief valve 4 separates the interior of the housing 2 into an upstream space S1 and a downstream space S2 of the filter element 3 (see FIG. 2(a)), and also closes the upstream space S1 when the filter element 3 is clogged. and the downstream space S2 becomes equal to or greater than a predetermined value, the valve portion 23 collapses inward to allow communication between the upstream space S1 and the downstream space S2 (see FIG. 2(b)).

The valve portion 23 is formed in an umbrella shape (in other words, a cylindrical shape whose diameter is reduced toward the axial end surface of the housing 2) having a central hole 23a. The valve portion 23 is pressed against the shaft end surface of the housing 2 (specifically, the inner surface of the ceiling portion of the housing 2 ) to seal the housing 2 . Further, the valve portion 23 has a gradually changing portion 31 whose thickness gradually decreases toward the axial end surface of the housing 2 (that is, the tip side of the valve portion 23). Furthermore, the tip side of the valve portion 23 is formed in an R shape.
As the central hole 23a, for example, one having a hole diameter of 5 to 10 mm can be adopted.

The passage portion 24 is arranged outside the valve portion 23 and allows oil to flow along the outer peripheral surface of the valve portion 23 . A plurality of passage portions 24 are provided around the axis of the valve portion 23 at predetermined intervals.

The convex portion 25 is arranged outside the valve portion 23 and presses against the shaft end surface of the housing 2 . This projection 25 protrudes toward the axial end surface of the housing. A plurality of protrusions 25 are arranged around the axis of the valve portion 23 at predetermined intervals. The passage portion 24 is formed by a notch between adjacent convex portions 25 .

The element holding portion 26 is arranged outside the valve portion 23 and presses against the axial end surface of the filter element 3 (specifically, the seal portion 21 of the filter medium 18) by the pressing force of the convex portion 25 to seal the filter element 3. to seal. This element pressing portion 26 is formed in an annular shape. Furthermore, the element pressing portion 26 is arranged directly below the plurality of protrusions 25 . In other words, the element pressing portion 26 and the plurality of projections 25 are arranged so as to overlap each other in the axial direction of the valve portion 23 .
As the element holding portion 26, for example, one having an outer diameter of 30 to 40 mm can be adopted.

The tip side of the protector 19 is fitted into the concave portion 27 . This concave portion 27 is formed in an annular shape. Also, the bottom side of the concave portion 27 is formed in an R shape. Furthermore, the recess 27 is arranged between the valve portion 23 and the element pressing portion 26 .
The oil filter 1 is assembled by fitting the front end of the protector 19 into the recess 27 to integrate the filter element 3 and the relief valve 4, and inserting the integrated body into the case 6. .

Next, the effects of the oil filter 1 and the relief valve 4 configured as described above will be described. The dashed arrows in the figure indicate the flow of oil.
As shown in FIG. 1, when the engine is in operation, oil on the engine side pushes up the check valve 13 from the oil inlet 11 and flows into the upstream space S1. The inflowing oil passes through the filter media 18 to filter out foreign matter such as dust, passes through the circulation holes 19a of the protector 19, reaches the downstream space S2, and passes through the oil outlet 12 to the lubricating path on the engine side. returned.

When the pressure difference between the upstream space S1 and the downstream space S2 in the housing 2 is less than a predetermined value, the valve portion 23 is pressed against the axial end surface of the housing 2 and the element pressing portion 26 is pressed against the axial end surface of the filter element 3. By doing so, the upstream space S1 and the downstream space S2 are separated (see FIG. 2(a)). In this state, the oil in the upstream space S1 passes through the filter element 3 and reaches the downstream space S2, where the oil is filtered.

On the other hand, when the pressure difference between the upstream space S1 and the downstream space S2 in the housing 2 exceeds a predetermined value, the pressure of the oil flowing through the passage 24 causes the valve portion 23 to be elastically deformed so as to collapse inward. The side space S1 and the downstream space S2 are communicated (see FIG. 2(b)). In this state, the oil in the upstream space S1 reaches the downstream space S2 without passing through the filter element 3, and an overpressure condition inside the housing 2 is prevented.

As described above, according to the oil filter relief valve 4 of the present embodiment, the valve portion 23 is formed in an umbrella shape having a central hole 23a and press-contacts with the shaft end surface of the housing 2, and the valve portion 23 is arranged outside the valve portion 23. A passage portion 24 for circulating oil along the outer peripheral surface of the valve portion 23, a convex portion 25 arranged outside the valve portion 23 and pressed against the axial end surface of the housing 2, and a convex portion arranged outside the valve portion 23. and an annular element presser portion 26 that presses against the axial end surface of the filter element 3 by the pressing force of the portion 25. The valve portion 23, the passage portion 24, the convex portion 25, and the element presser portion 26 are integrally formed of an elastic material. ing. The relief valve 4 separates the interior of the housing 2 into the upstream space S1 and the downstream space S2 of the filter element 3, and when the pressure difference between the upstream space S1 and the downstream space S2 reaches or exceeds a predetermined value, , the upstream space S1 and the downstream space S2 are communicated with each other by tilting the valve portion 23 inward. As a result, the component of the relief valve 4 is one point made of an elastic material, and compared to the conventional relief valve 104 (see FIG. 6) having four components, the number of parts is greatly reduced. can be simplified. As a result, it is possible to reduce the man-hours for assembling the relief valve 4, the man-hours for processing, and the man-hours for sorting disposal, and also reduce the weight.

Moreover, in the present embodiment, a recess 27 is provided in which the tip side of the protector 19 constituting the filter element 3 is fitted. This can prevent the relief valve 4 from falling off the filter element 3 . Furthermore, the filter element 3 and the relief valve 4 can be handled as an integrated unit by fitting the tip side of the protector 19 into the recess 27, so that the oil filter 1 can be easily assembled.

Further, in this embodiment, the valve portion 23 has a gradually changing portion 31 whose wall thickness gradually decreases toward the axial end surface of the housing 2 . Thereby, the sealing performance and elastic deformability of the valve portion 23 are enhanced.

Furthermore, in this embodiment, a plurality of projections 25 are provided around the axis of the valve portion 23 at predetermined intervals, and the passage portion 24 is formed by notches between adjacent projections 25 . Thereby, the passage portion 24 and the convex portion 25 can be easily formed.

It should be noted that the present invention is not limited to the above-described examples, and may be variously modified examples within the scope of the present invention according to the purpose and application. That is, in the above-described embodiment, the tip side of the protector 19 is fitted into the recess 27 to prevent the relief valve 4 from coming off. Instead of or in addition to the concave portion 27, the relief valve 4 may be prevented from coming off by engaging the convex portion 25 with a projection 32 provided on the axial end surface of the housing 2. FIG.

Furthermore, in the relief valve 4 of the above-described embodiment, for example, as shown in FIG. Further, for example, minute protrusions may be provided on the sealing surfaces of the valve portion 23, the convex portion 25, the element pressing portion 26, and the like to improve the sealing performance.

The foregoing examples are for illustrative purposes only and are not to be construed as limiting the invention. While the present invention has been described by way of examples of exemplary embodiments, it is understood that the words used in describing and illustrating the invention are words of description and illustration, rather than words of limitation. Changes may be made within the scope of the appended claims without departing from the scope or spirit of the invention in its form, as detailed herein. Although reference has been made herein to specific structures, materials and embodiments in describing the invention, it is not intended that the invention be limited to the disclosure herein, but rather the invention as set forth in the appended claims. It covers all functionally equivalent structures, methods and uses within its scope.

The present invention is not limited to the embodiments detailed above, and various modifications and changes are possible within the scope of the claims of the present invention.

INDUSTRIAL APPLICABILITY The present invention finds wide application as a technique for preventing overpressure conditions within the housing of a fluid filter.

1; oil filter, 2; housing, 3; filtering element, 4; relief valve, 19; protector (support cylinder), 23; valve portion, 23a; central hole, 24; pressing portion 27; concave portion 31; gradually changing portion S1; upstream space S2; downstream space.

Claims (5)

A relief valve for a fluid filter disposed between an axial end side of a tubular housing and an axial end side of a tubular filtering element housed in the housing,
a valve portion formed in an umbrella shape having a central hole and pressed against the axial end surface of the housing;
a passage portion disposed outside the valve portion and allowing a fluid to flow along the outer peripheral surface of the valve portion;
a convex portion arranged outside the valve portion and in pressure contact with the shaft end surface of the housing;
an annular element presser portion disposed outside the valve portion and pressed against the axial end surface of the filter element by the pressing force of the convex portion;
the valve portion, the passage portion, the convex portion and the element holding portion are integrally formed of an elastic material,
The relief valve isolates the inside of the housing into an upstream space and a downstream space of the filter element, and when a pressure difference between the upstream space and the downstream space reaches a predetermined value or more, the valve portion A relief valve for a fluid filter, characterized in that the upstream space and the downstream space are communicated by falling inward. 2. The relief valve for a fluid filter according to claim 1, comprising a concave portion into which a tip end side of a support cylinder constituting said filtering element is fitted. 3. The relief valve for a fluid filter according to claim 1, wherein the valve portion has a gradually changing portion whose wall thickness gradually decreases toward the axial end surface of the housing. A plurality of the convex portions are provided at predetermined intervals around the axis of the valve portion,
4. The relief valve for a fluid filter according to any one of claims 1 to 3, wherein the passage portion is formed by a notch between the adjacent projections. A fluid filter comprising a relief valve for a fluid filter according to any one of claims 1 to 4.

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