JPH09137708A - Relief valve device for fluid filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of part items and improve the seal function of a bypass hole in a using condition before a set pressure is applied, by separately forming a valve seat body and a valve element, and integrally arranging a spring to the valve element. SOLUTION: A valve seat body 12 for closing the hollow part of a filter element 3 and a valve element 13 by which a bypass hole 14 arranged on the valve seat body 12 is closed from a side opposite to a fluid flow direction, are arranged in a part close to one end of a main body case 2. The valve element 13 is formed by integrally connecting a valve part 13a for closing the bypass hole 14 and a spring part 13b for pushing the valve part 13a to the valve seat body 12 against fluid pressure to each other by an elastic material such as a plate spring. The spring part 13b is bent so as to be formed in a circular arc shape, an U-shape or a spiral shape so that the valve element 13 is mounted on the valve seat body 12 impossible to be slipped off against the elasticity of the valve element 13. Hereby, a function that the bypass hole 14 of the valve seat body 12 is closed by the valve element 13 in a condition before a set pressure is applied, can be remarkably improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid filter such as an oil filter used in an internal combustion engine for an automobile, in which the pressure of the fluid exceeds the set pressure due to clogging of the filter element or the like. sometimes,
The present invention relates to an improvement of a safety valve device that allows a fluid to directly escape without passing through a filter element.

[0002]

2. Description of the Related Art An oil filter for an internal combustion engine for an automobile is disclosed in, for example, Japanese Patent Publication No. 4-50497 and as shown in FIG. The filter element 51 is arranged concentrically, and a safety valve device 52 is provided at one end of the filter element 51. When the oil pressure is equal to or lower than a set pressure, the oil is placed outside the filter element 51. When the oil pressure exceeds a set pressure due to clogging of the filter element 51 or the like, the oil flows into the safety valve device 5 provided at one end of the filter element 51.
2 leaks into the hollow portion of the filter element 51.

The safety valve device 52 of Japanese Patent Publication No. 4-50497 discloses a valve seat body 54 made of a metal plate in which a bypass hole 53 is formed in one end surface of the filter element 51.
And a tubular spring receiver 54 protruding into the hollow portion of the filter element 51 is fixed to the filter element 51 by spot welding.
The coil spring 55 accommodated and supported in the bypass hole 5
A valve body (relief valve) 56 that closes 3 is pressed against the valve seat body 54.

The valve seat 54 is integrally provided with a spring piece 54a which abuts the inner surface of the main body case 50, and the spring piece 54a presses and fixes the filter element 51. Needless to say, filter element 5
When the pressure of the oil on the outer side of 1 exceeds the set pressure, the coil spring 55 contracts and deforms, and the oil leaks from the bypass hole 53 to the hollow portion of the filter element 51. In other words, the oil is allowed to escape from the bypass hole 53 by utilizing the fact that the coil spring 55 is contracted and deformed by a constant external force.

[0005]

[Problems to be Solved by the Invention]
Not only in Japanese Patent Publication No. 97, but most of the conventional filter safety valve devices require a valve element and a coil spring to close the bypass hole, and have a function of sealing the bypass hole in the state before the set pressure acts, and a fluid. Although there is no problem in terms of the function of leaking fluid when the pressure becomes higher than the set pressure, there is a problem in that the number of members is large and the manufacturing and assembling costs are high. In particular, the spring seat 54 is replaced by the valve seat body 54.
Those that are spot-welded and fixed to the above further increase the labor for assembling.

In this regard, in Japanese Utility Model Publication No. 3-46815, a cut is made in a leaf spring overlapping one end face of a filter element to form a bypass hole and a valve portion for closing the bypass hole in the leaf spring. When the oil pressure exceeds a certain level, the base portion of the valve portion is elastically deformed, and the valve portion flexes and moves in the thickness direction, so that the oil can be leaked to the hollow portion of the filter element. (In addition, as a device in which the valve body is made of a leaf spring and the number of members is reduced, a Japanese Utility Model Publication No. 62-27
No. 204, No. 3-53788, No. 6
No. 2-56109, etc.).

However, in the construction of Japanese Utility Model Publication No. 3-46815, it is troublesome to make a notch in the leaf spring so that oil does not leak, and moreover, even if the valve portion is slightly bent and deformed, the bypass hole becomes a filter element. Since it communicates with the inside and outside, there is a problem that there is doubt about the function of sealing the bypass hole in a normal use state. The present invention provides a safety valve device capable of improving the sealing function of a bypass hole in a use state before a set pressure is applied when the number of parts is reduced by integrally providing a spring portion on a valve body. The purpose is.

[0008]

In order to achieve this object, the present invention provides a concentric hollow cylindrical filter element through which a fluid permeates radially inward in a main body case having one end closed and the other end open. In a filter arranged in the shape of a filter, the filter element is arranged at a position near one end of the main body case so that the fluid leaks into the hollow portion of the filter element when the pressure of the fluid becomes excessive outside the filter element. A valve seat body that closes the hollow portion of the filter element at a position near one end of the main body case, and a valve body that closes a bypass hole provided in the valve seat body from the side opposite to the fluid flow direction. The valve body is made of an elastic material such as a leaf spring to close the bypass hole, and the valve portion is pressed against the valve seat body against the pressure of fluid. Is formed integrally with a spring portion for bending, and the spring portion is bent in an arc shape, a U shape, a spiral shape, or the like, and the valve body is seated against the elasticity of the valve body. It is attached to the body irremovably. "

[0009]

With this structure, since the valve seat body and the valve body are separate bodies, it is possible to process the valve seat body and the valve body without particularly high precision. The valve portion can close the bypass hole of the valve seat body. In addition to this, since the valve portion of the valve body is pressed against the valve seat body only from the direction opposite to the flow direction of the fluid, the valve body closes the bypass hole of the valve seat body in the state before the set pressure is applied. The function can be remarkably improved as compared with the above-mentioned Japanese Utility Model Publication No. 3-46815.

In other words, although the valve body is formed by integrally forming the valve portion and the spring portion, it has the function of sealing the bypass hole during normal use and the function of leaking the fluid when pressure is applied. It can continue to be used, and the reliability of the safety valve device can be greatly improved.
In addition, since the valve body integrally connected with the spring portion can be attached to the valve seat body by deforming against its elasticity, when the coil spring or the valve body is configured as the valve body as in the conventional case. Processing costs and assembly costs can be reduced compared to.

Further, according to the present invention, since the filter element can be pressed and fixed by the spring piece integrally provided on the valve seat body, the valve portion and the spring portion are integrally provided on the valve body. In addition to the effect of reducing the number of parts by
Further, the number of members can be reduced, and as a result, the manufacturing cost / assembly cost can be further reduced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which the present invention is applied to an oil filter for an internal combustion engine will be described with reference to the drawings (FIGS. 1 to 1).
This will be described based on 8). 1 to 4 show a first embodiment, of which FIG. 1 is a partially cutaway front view of the oil filter 1, and FIG. 2 is an enlarged view of a main part.

The oil filter 1 is provided with a main body case 2 made of a metal plate having one end 2a closed and the other end open, and a hollow cylindrical filter element 3 is concentrically provided in the main body case 2. Are arranged in a shape. The filter element 3 is mainly composed of a filter paper bent in a zigzag shape, and a large number of through holes 4 are formed in an inner peripheral wall 3a for holding the filter paper.

A ring-shaped cover plate 5 is fixed to the opening of the other end of the main body case 2 by winding, and an O-ring 6 for sealing is fitted on the outer surface of the cover plate 5. Inside the cover plate 6, a bottom plate 9 made of synthetic resin, which is provided with an outflow port 7 and an inflow port 8, is arranged. A valve disc 10 made of an elastic material such as synthetic resin or rubber is interposed between the bottom plate 9 and the filter element 3.

In a normal state, the oil flowing into the inflow port 7 of the bottom plate 9 permeates the filter element 3 inward as shown by a solid arrow in FIGS.
Emitted from. When the pressure of the oil becomes excessive on the outside of the filter element 3, the oil is provided at a portion of the filter element 3 near the one end portion 2a of the main body case 2 as shown by a dotted arrow in FIGS. All the valve devices 11 leak directly into the hollow portion 3b of the filter element 3.

Next, the safety valve device 11 will be described. The safety valve device 11 is composed of a valve seat body 12 and a ring-shaped valve body 13 which are superposed on one end surface of the filter element 3. The valve seat 12 is made of synthetic resin having excellent heat resistance and strength, and by integrally forming a spring piece 12a that elastically abuts the inner surface of the one end portion 2a of the main body case 2, it has a substantially H-shape in a plan view. Is forming. Further, a bottomed cylindrical portion 12b that is adapted to enter the hollow portion of the filter element 3 is provided so as to project downward, and bypass holes 14 are provided on both sides of the wall surface of the bottomed cylindrical portion 12b with the axis center therebetween. The hole 14 is closed by the valve body 13 fitted from the outside into the bottomed tubular portion 12b.

The valve body 13 is manufactured by bending a leaf spring into a ring shape, and has a bypass hole 14
A pair of valve portions 13a that abut the bottomed tubular portion 12b of the valve seat body 12 at the point of, and a curved spring portion 13b that connects both valve portions 12a.
And are formed in a substantially C shape. Further, a small-diameter hole 15 is bored in the spring portion 13b, while a projection 16 into which the hole 15 is fitted is integrally formed on the outer peripheral surface of the bottomed tubular portion 12b of the valve seat body 12, whereby the valve body 13 is formed. It is held so that it cannot rotate and cannot fall off.

As shown by the alternate long and short dash line in FIG. 4, the valve body 13 is pushed into the bottomed cylindrical portion 12b while widening the opening thereof, and the engaging hole 15 is fitted into the protrusion 16 so that the valve seat is seated. It can be attached to the bottomed tubular portion 12b of the body 12. Both ends of the valve body 13 are bent outwardly in a U shape in a plan view so that they can be expanded and deformed by using a snap ring expander. This is for guiding the fitting when the valve body 12 is mounted, and for the valve body 1 once mounted.
This is because the 3 can be easily removed.

In the above structure, when the pressure of the oil on the outside of the filter element 3 becomes equal to or higher than the set pressure, the valve body 13 expands and deforms, and the oil leaks from the bypass hole 14 to the hollow portion of the filter element 3. And
Since the spring portion 13b is integrally formed with the valve body 13, the number of members can be reduced and the processing cost can be reduced, and the valve body 13 utilizes its elastic deformation to allow the valve seat body 1 to operate.
Since it can be attached to the valve 2 with one touch, the assembly cost of the valve device 11 can be reduced.

When the filter element 3 is pressed and fixed by the spring piece 12a integrally formed with the valve seat body 12 as in this embodiment, the cost can be further reduced. FIG. 5 shows a second embodiment in which a seal ring 17 made of rubber or the like is interposed between the valve seat body 12 and the filter element 3, and when configured in this way, the valve seat body 12 is provided with the filter element. It is possible to reliably prevent oil from leaking inward from the overlapping surface with 3 (separate diagram (B) is BB of (A)
It is a fundus sectional view).

In this case, a plurality of radially outwardly extending pawls 18 are provided on the lower surface of the valve seat body 12 along the circumferential direction at appropriate intervals.
The claw 18 holds the seal ring 17 on the lower surface of the valve seat body 12. By doing so, the handling becomes easy, and it is possible to avoid increasing the labor for assembling the filter 1. The claw 18 may be formed to extend over the entire circumference.

FIG. 6 shows a third embodiment, which is a modification of the first embodiment (FIG. 6B is a sectional view taken along line BB in FIG. 6A).
It is a cross-sectional view). In this embodiment, the bottomed tubular portion 12b of the valve seat body 12 is formed in a rectangular cross section, and an outward tubular rib 19 is provided at the location of the bypass hole 14, and a ring-shaped seal made of rubber or the like is provided on the rib 19. The body 20 is fitted and the seal body 20
The valve portion 13a of the valve body 13 is applied to. This has the advantage that the sealing at the bypass hole 14 can be ensured. In this embodiment, the support piece 21 is provided on the lower end of the bottomed cylindrical portion 12b so as to project outward, and the valve piece 13 is supported by the support piece 21 so as not to fall off.

FIG. 7 shows a fourth embodiment which is a modification of the first embodiment. In this embodiment, a tubular rib 19 is provided outwardly at a location of the bypass hole 14 in the valve seat body 12, while the valve portion 13a of the valve body 13 is provided in the bypass hole 14
It is formed so as to bulge into a conical shape so that it fits in. With this configuration, it is not necessary to separately provide a rotation stopping means for the valve body 13.

In the above-mentioned first to fourth embodiments, the valve body 12 is expanded to leak oil.
8 and 9 show a fifth embodiment in which the valve element 13 made of a leaf spring is pressed and deformed to leak oil (FIG. 9 is a sectional view taken along line IX-IX in FIG. 8). ). That is, in this fifth embodiment, the valve body 13 is formed in a lateral U-shape, while a gutter-shaped (upper open U-shaped cross section) support portion 12c is integrally formed on the lower surface of the valve seat body 12 to form a valve seat. By providing the bypass hole 14 in the portion of the body 12 surrounded by the support portion 12c, and inserting the valve body 13 in the compressed state into the support portion 12c and then restoring it as shown by the alternate long and short dash line in FIG. The valve body 13 closes the bypass hole 14.

In this case, the through hole 2 is formed in the bottom plate of the supporting portion 12c.
2 is drilled. Further, a front locking piece 23 that engages with one end of the support portion 12c is formed by bending at the lower end of the valve body 13, and the lower base end of the valve body 13 engages with the other end of the support portion 12c. The rear locking piece 24 is cut and raised, and the valve element 13 is held by the front and rear locking pieces 23 and 24 so as not to fall off.

As described above, the construction in which the oil is leaked by the pressing and contracting action of the valve body 13 has an advantage that the settling phenomenon of the valve body 13 can be suppressed and the durability can be improved.
Further, since the valve body 13 is pressed against the support portion 12c by the oil pressure, even if the oil pressure momentarily acts on the valve body 13 to cause a dance phenomenon in the valve body 13,
There is also an advantage that it can be surely prevented from falling off.

As shown by the alternate long and short dash line 25 in FIG.
The valve body 13 may be bent in a loop shape, which is effective when the set pressure is high. Similarly, as indicated by the alternate long and short dash line 26 in FIG. 8, the valve body 13 may be formed so as to bulge so as to fit into the bypass hole 14. FIGS. 10 and 11 also show a sixth embodiment in which the valve body 13 is formed in a hairpin shape (FIG. 11 is a sectional view (A) of FIG. 10).
XIA-XIA sectional view, the partial view (B) is XIB-XIB of FIG.
It is a cross-sectional view).

That is, in this embodiment, the cylindrical portion 12d having the bypass hole 14 opened is integrally formed on the lower surface of the valve seat body 12, and the flange portion 12e is integrally formed on the lower end of the cylindrical portion 12d, while the valve body 13 is formed. Is formed into a hairpin shape (lateral U shape), and the groove portion 27 to be fitted into the cylindrical portion of the valve seat body 13 is cut open in the spring portion 13b, so that the valve body 13 has a flange of the valve seat body 12. The part 12e is sandwiched.

In this case, the flange portion 12e of the valve seat body 11
An engaging groove 28 is formed on the upper surface of the valve body 13, and a claw portion 29 formed by bending the tip of the spring portion 13b of the valve body 13 is fitted into the engaging groove 28 to hold the valve body 13 in a non-removable manner. ing. Also in this embodiment, since the claw portion 29 is pressed against the engagement groove 28 by the pressure of the oil, it is possible to reliably prevent an unexpected situation in which the valve body 13 falls off due to vibration or the like.

In the case of this embodiment, as shown in FIG. 11C, the bypass hole 14 is formed in the valve portion 13a of the valve body 13.
It is also possible to bulge and form the convex portion 13c that fits into the inside of the above, and to fit the ring-shaped seal body 20 to the convex portion 13c.
FIG. 12 shows the seventh embodiment. In this example,
A cylindrical portion 12d having a bypass hole 14 opened downward is integrally formed on the lower surface of the valve seat body 12, and an annular projection 12f is formed on the outer peripheral surface of the lower end portion of the cylindrical portion 12d. Further, a tubular rib 19 surrounding the bypass hole 14 is formed on the lower end surface of the tubular portion 12d.

On the other hand, the valve body 13 is made of a leaf spring cylinder, and is mounted on the holder portion 13d which fits tightly on the cylinder portion 12d of the valve seat body 12, and on the upper surface of the annular projection 12f of the valve seat body 13. The cut-and-raised claw 30 that engages with the stopper piece 31 that contacts the lower end surface of the annular projection 12f are integrally formed.
A curved spring portion 13b and a valve portion 13a are connected to the lower end of the holder portion 13d.

In this embodiment, the valve body 13 can be attached by simply fitting the holder portion 13d into the cylindrical portion 12d of the valve seat body 13 in the axial direction against the elasticity, so that the assembly is further simplified. FIG. 13 shows an eighth embodiment which is a modification of the fifth embodiment. In this embodiment, the fifth
A gutter-shaped support portion 12c is provided in the valve seat body 12 as in the embodiment, and the spring portion 13b of the valve body 13 is bent in a zigzag shape when the valve body 13 is fitted into the support portion 12c. . According to this structure, the length of the spring portion 13b becomes long and the elastic deformation amount per unit length becomes small, so that there is an advantage that the durability can be remarkably improved.

The front locking piece 23 is engaged with the through hole 22 of the supporting portion 12c. FIG. 14 shows a ninth embodiment. In this embodiment, the valve seat body 12 is integrally formed with a bottomed cylindrical portion 12b protruding to the outside of the filter element 3,
A pair of bypass holes 14 are formed in the peripheral wall of the bottomed tubular portion 12b, and the bypass holes 14 are closed from the inside by a valve body 13 fitted in the bottomed tubular portion 12b.

In this case, the valve portion 13a of the valve body 13 is bulged in a conical shape (or trapezoidal shape) so as to fit into the bypass hole 14, and the spring portion 13b is bent in a zigzag shape. There is. Further, in this embodiment, the main body case 2
Of the coil spring 32 between the inner surface of the portion 2a and the valve seat body 13.
Alternatively, the valve seat body 12 and the filter element 3 are fixed by interposing the leaf spring 33.

FIG. 15 shows the tenth embodiment. In this embodiment, the valve seat body 12 is formed of a metal plate in a bottomed cylindrical shape with a downward opening, and a bypass hole 14 is formed in the upper surface thereof. On the other hand, a receiving member 34 made of a metal plate is placed on one end surface of the filter element 1, and the receiving member 34 is provided with a tubular portion 34a which is inserted into the hollow portion of the filter element 3. The valve seat body 12 is fitted to the valve seat body 12 in an immovable manner, and the valve seat body 1
2, the valve body 13 disposed inside the cylinder 2 of the receiving member 34
It is supported by 4a.

As means for fitting the valve seat body 12 into the cylindrical portion 34a of the receiving member 34, an annular projection 35 formed on the outer peripheral surface of the valve seat body 12 is attached to the inner peripheral surface of the cylindrical portion 34a of the receiving member 34. The annular groove 36 formed is forcibly fitted. Further, the valve body 13 includes a conical valve portion 13a fitted in the bypass hole 14 and a spiral spring portion 13b. The lower surface of the tubular portion 34a of the receiving member 34 is open.

When constructed as in this embodiment, the spring portion 13
Since b has the same shape as a normal coil spring, durability can be improved. The valve body 13 according to the tenth embodiment is shown in FIG.
As shown in FIG. 16A, after punching the material plate into a shape in which the linear spring portion 13b extends to the valve portion 13a,
As shown in (B), the spring portion 13b can be easily manufactured by winding the spring portion 13b around the round bar 38, bending it into a spiral shape, and then quenching.

Alternatively, as shown in FIG. 16C, the material plate is punched into a shape in which the spring portion 13b extends in a spiral shape around the valve portion 13a, and then the base end and the tip end of the spring portion 13b are printed on the paper surface. It can be easily manufactured by a process of three-dimensionally processing by stretching in a direction orthogonal to and then quenching. FIG. 17 shows the eleventh embodiment. In this embodiment, a valve seat body 12 made of synthetic resin is formed by concentrically forming an upward bottomed cylinder portion 12b and a downward cylinder portion 12g, and a bypass hole 14 is formed on the top surface of the bottomed cylinder portion 12b. On the other hand, a plurality of engagement holes 39 are formed in the cylindrical portion 12g along the circumferential direction.

On the other hand, the valve body 13 is a trapezoidal valve portion 13a.
, A spiral spring portion 13b, and a ring portion 13d connected to the spring portion 13b. An inward hook-shaped locking claw 40 is projected upward on the outer peripheral edge of the ring portion 13d. The stop claw 40 is elastically fitted into the engagement hole 39 of the cylindrical portion 12g of the valve seat body 12. As shown in FIG. 17 (B), the valve body 13 of this embodiment has a material plate,
3a and the ring portion 13d are punched and formed in a form in which the elongated spring portion 13b is connected to each other, and then the spring portion 13b is helically bent by a means as shown in FIG. 16B, and then quenched. Can be easily manufactured.

FIG. 18 shows a twelfth embodiment. In this embodiment, as in the case of the eleventh embodiment, in the case where the valve seat body 12 is formed with an upward bottomed cylinder portion 12b and a downward cylinder portion 12g, a pair (one piece) is provided on the peripheral wall of the bottomed cylinder portion 12b. However, the valve body 13 is bent into a substantially heart shape, and the bypass hole 14 is closed from the inside by this valve body 13.

In this case, an engaging hole 39 is formed in the cylindrical portion 12g of the valve seat body 12, and an engaging claw 40 formed by cutting and raising the valve body 13 is fitted into the engaging hole 39, whereby the valve is closed. Body 1
Holds 3 incapable of falling off. Although the embodiments of the present invention have been described above, it goes without saying that the present invention can be embodied in other forms.

The material of the valve element is preferably a leaf spring in terms of reliability, but may be made of synthetic resin if the conditions permit.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of an oil filter equipped with a safety valve according to a first embodiment.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a plan view of a valve seat body.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a diagram showing a second embodiment.

FIG. 6 is a diagram showing a third embodiment.

FIG. 7 is a diagram showing a fourth embodiment.

FIG. 8 is a diagram showing a fifth embodiment.

FIG. 9 is a sectional view taken along line IX-IX of FIG.

FIG. 10 is a partially cutaway front view showing a sixth embodiment.

11A is a view taken along the line XIA-XIA of FIG. 10, FIG. 11B is a cross-sectional view taken along the line XIB-XIB of FIG. 10, and FIG.

FIG. 12 is a diagram showing a seventh embodiment.

FIG. 13 is a diagram showing an eighth embodiment.

FIG. 14 is a diagram showing a ninth embodiment.

FIG. 15 is a diagram showing a tenth embodiment.

16 is a view showing a processing means of the valve body in FIG.

17 (A) is a diagram showing an eleventh embodiment, and FIG. 17 (B) is a diagram showing a valve body processing means.

FIG. 18 is a sectional view showing a twelfth embodiment.

FIG. 19 is a diagram showing a conventional example.

[Explanation of symbols]

 1 oil filter 2 body case 3 filter element 11 valve device 12 valve seat body 13 valve body 13a valve portion 13b spring portion 14 bypass hole

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Kodaira 69 shares at 652 Takamiya, Neyagawa-shi, Osaka Prefecture BCE Manufacturing Co., Ltd. (72) Inventor Masaaki Kodaira 69 shares at 652 Takamiya, Neyagawa-shi, Osaka Prefecture Ceremony Company BCE Factory

Claims (2)

[Claims] 1. A filter comprising a hollow cylindrical filter element concentrically arranged to allow fluid to pass radially inwardly in a main body case having one end closed and the other end open. A safety valve device arranged at a portion of the filter element near one end of the main body case so that the fluid leaks into the hollow portion of the filter element when the pressure of the fluid becomes excessive. In which a valve seat body that closes the hollow portion of the filter element and a valve body that closes a bypass hole provided in the valve seat body from the side opposite to the fluid flow direction are provided, and the valve body is made of an elastic material such as a leaf spring. A valve part for closing the bypass hole and a spring part for pressing the valve part against the valve seat body against the pressure of the fluid are integrally formed, For a fluid, characterized in that the spring portion is bent and formed in an arc shape, a U shape, a spiral shape, etc., and the valve body is attached to the valve seat body so as not to fall off against the elasticity of the valve body. Filter safety valve device. 2. The valve seat body according to claim 1, wherein the valve seat body is made of synthetic resin or a metal plate, and is superposed on the outer surface of one end of the filter element. A safety valve device for a fluid filter, wherein a spring piece elastically abutting on the inner surface of the portion is integrally provided, and the filter element is pressed and fixed in the main body case by a tensioning action of the spring piece.