JPH09152052A - Safety valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with a coil spring and a stopper holding the coil spring placed on a valve body in a valve receiving part in the compressed condition, so as to reduce the number of parts, by directly fixing the outer circumferential part of a belleville spring to the valve receiving part. SOLUTION: A subassembled valve body 3 and a belleville spring 4 are received in the valve receiving part 21 of a base part 2. Then, the lower end of the outer circumferential part 8 of the belleville spring 4 is placed on the placing face 213 of the valve receiving part 21, and the seal face 31 of the valve body 3 is seated on a valve seat 211. Hereafter, the top end 220 of a head part 22 as the upper end of the valve receiving part 21 is simultaneously caulked at four positions spaced at equal intervals (about 90 deg.) in the circumferential direction S so as to form a caulked part 25, and the outer circumferential part 8 is fixed. Hereby, the belleville spring 4 is fixed and held to the valve receiving part 21. Further, the valve body 3 is energized by the energization force of the three elastic pieces 7 of the belleville spring 4, a hole 20 is closed, and the valve body is held under the condition in which communication of the hole 20 and the valve receiving part 21 is intercepted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety valve which is used by being connected to a pipe for flowing a pressurized fluid and which prevents the pipe from being damaged by an abnormally high pressure inside.

[0002]

2. Description of the Related Art A conventional safety valve 1B shown in FIG.
A base portion 2b having a hole 20b forming a pressure fluid passage and a valve accommodating portion 21b in which the hole 20b is open; a valve body 3b accommodated in the valve accommodating portion 21b of the base portion 2b to open and close the hole 20b;
-A coil spring 4b whose end side is placed on the valve body 3b and biases the valve body 3b in the closing direction, and a stopper which abuts against the other end side of the coil spring 4b and is caulked and fixed to the end portion of the valve accommodating portion 21b. And 5b.

The safety valve 1B is held in a state where the hole 20b is closed by a valve body 3b biased by a coil spring 4b, and is used as a pipe for flowing a pressure fluid, for example, in a refrigerant circulation circuit 9 of a car cooler shown in FIG. A high-pressure side passage 91 (see FIG. 13) in the built-in compressor 90, a high-pressure side pipe 92 for sending out high-pressure refrigerant compressed by the compressor 90 to a condenser (condenser) 93, and superheated steam supply of a boiler (not shown) Used by connecting to piping for

Further, when the safety valve 1B is used by being connected to the high pressure side passage 91 in the compressor 90, for example, the pressure of the high pressure refrigerant in the high pressure side passage 91 is regulated (set).
When the pressure becomes higher than the value, this pressure causes the valve element 3b to move in a direction against the biasing force of the coil spring 4b, thereby opening the hole 20b. Then, the negative part of the high-pressure refrigerant in the high-pressure side passage 91 is released into the atmosphere from the hole 20b through the valve accommodating portion 21b, and the increased pressure in the high-pressure side passage 91 is released.

Therefore, the pressure in the high-pressure passage 91 does not become abnormally high, and damage to the refrigerant circulation circuit 9 due to abnormal pressure can be prevented. When the abnormal pressure in the high pressure side passage 91 returns to the normal pressure, the hole 20b is held in the closed state by the valve body 3b biased by the coil spring 4b again.

[0006]

The above-mentioned conventional safety valve 1B.
The component parts of 4 are composed of a base portion 2b, a valve body 3b, a coil spring 4b, and a stopper 5b. Further, since the coil spring 4b is installed between the stopper 5b and the valve body 3b in the valve accommodating portion 21b, it is necessary to form a long space L3 along the axis P direction, and the total length of the base portion 2b. Since L4 is as long as about 35 mm, there is room for downsizing and cost reduction.

It is an object of the present invention to provide a safety valve which can achieve further compactness and cost reduction.

[0008]

A safety valve according to a first aspect of the present invention comprises a base portion having a hole for forming a pressure fluid passage and a valve accommodating portion in which the hole is opened, and an outer peripheral portion fixed to the valve accommodating portion. A disc-shaped spring consisting of a plurality of elastic pieces extending from the outer peripheral portion in the central direction or the circumferential direction and divided by slits, and a valve sandwiched between the opening of the hole and the elastic piece of the disc-shaped spring. Characterized by consisting of a body.

A disc-shaped spring according to a second aspect of the present invention has a central portion which connects central ends of the elastic pieces in the safety valve according to the first aspect. The disc-shaped spring according to claim 3 further comprises a ring-shaped outer peripheral portion and a central portion of the safety valve according to the first aspect, and a plurality of elastic pieces that connect the outer peripheral portion and the central portion and are divided into slits. Become.

The valve body according to claim 4 is held at the center of the disc-shaped spring in the safety valve according to claim 1.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A plurality of elastic pieces of a disc-shaped spring used in a safety valve of the present invention are formed between a central region and an outer peripheral region and have a shape capable of elastically deforming in the thickness direction of the disc-shaped spring. Is. In order to form the plurality of elastic pieces, a plate made of spring steel is plastically worked into a desired three-dimensional shape in the thickness direction and then quenched to give a spring function.

The shape and size of the elastic piece, the thickness, the height (the dimension from the reference position to the plastically processed position), the number, and the area ratio of the elastic piece and the slit in the plastic working are described. Various settings can be made according to the purpose. As the three-dimensional shape of the elastic piece, for example, a region that is divided into each slit by forming a plurality of slits at equal intervals in the circumferential direction when viewed from a plane and that connects the ring-shaped outer peripheral portion and the central portion. The cross-sectional shape of the convex shape protruding from the horizontal position,
An uneven shape, a corrugated shape, or the like can be used.

Further, in this case, it is possible to set various shapes of the respective slits as seen from a plane. The shape of each slit can be an isosceles triangle, a rectangle, an S-shape, a spiral shape, etc., whose top is on the side facing the center. As a means for fixing the disc-shaped spring to the valve accommodating portion of the base portion, it is preferable in terms of cost to crimp the peripheral edge of the upper end of the valve accommodating portion to the inner peripheral side.

When caulking the peripheral edge of the upper end of the valve accommodating portion, the caulking position is the entire area of the peripheral edge, or two points, three points, and more partial areas that are equally spaced within the entire area. Areas can be applied.

[0015]

【Example】

(Embodiment 1) Embodiment 1 of the present invention and a safety valve will be described with reference to FIGS. As shown in FIGS. 1 and 2, the safety valve 1 according to the first embodiment includes a base portion 2, a valve body 3, and a disc-shaped spring 4.

The base portion 2 is a forged product finished by machining, and has a hole 2 penetrating the central portion and forming a pressure fluid passage.
0, a valve accommodating portion 21 in which the hole 20 is open, and a hexagonal bolt-shaped head portion 22, a circular collar portion 23 having a predetermined thickness formed on the lower end side of the head portion 22, and a circular collar portion 23. And a lower neck portion 24 that hangs down from the lower end side of the same with a predetermined length.

The hole 20 has an inner diameter of 2 mm and a length of 13 mm. The valve accommodating portion 21 has a concave recessed shape formed on the head portion 22 and has a depth of 4 m from the top end 220 of the head portion 22.
m and inner diameter 9 mm. In this valve accommodating portion 21,
It is formed around the opening of the hole 20 and is 0.5 from the inner bottom surface 210.
The disc seat 211 protruding to a height of mm and the disc-shaped spring 4 at a horizontal position on the inner peripheral wall 212 having a height of 2 mm from the inner bottom surface 210.
A spring mounting surface 213 for mounting the is formed.

A male screw portion 24 is provided on the outer circumference of the lower neck portion 24.
0 is formed. The valve body 3 is made of synthetic rubber, and is a circular plate-shaped valve portion 30 having a sealing surface 31 that is seated on the valve seat 211 of the valve housing portion 21 on the end side thereof or that is separated from the valve seat 211 to open and close the hole 20. And an umbrella-shaped protrusion 32 formed at the other end on the side opposite to the sealing surface 31 and having an enlarged tip.

The disc spring 4 is made of spring steel and has a thickness of 0.2.
A plate having a diameter of 10 mm, which has been processed, is fixed to the valve holding portion 5 of the base 2 and the valve holding portion 5 which is formed on the negative side of the central region and has a downward section. The outer peripheral portion 8 and the three slits 6 formed between the valve holding portion 5 and the outer peripheral portion 8 and extending in the radial direction or the circumferential direction S.
And three elastic pieces 7 divided by each slit 6.

The valve holding portion 5 has a circular top portion 51 having a valve mounting hole 50 in the center and a peripheral wall 52 hanging substantially vertically from the periphery of the top portion 51, and has a circular recess having an inner diameter of 4.5 mm and a depth of 1 mm. 53 is formed. Each of the slits 6 is formed at an inner circumferential side arcuate space 60 extending in the circumferential direction S by about 90 °, and at a position separated from the inner circumferential side arcuate space 60 by 1.5 mm in the radius R direction and at about 85 ° in the circumferential direction S. It consists of an outer peripheral side arcuate space 62 that extends and a connecting space 61 that connects the end a of the inner peripheral arcuate space 60 and the other end b of the outer peripheral arcuate space 62.

The inner circumferential arcuate spaces 60 and the outer circumferential arcuate spaces 61 of the slits 6 are provided at equal intervals in the circumferential direction at concentric circular positions with a predetermined interval. Each inner circumferential side arcuate space 60 has a first side wall 601 having a radius of curvature of 2.8 mm and a second side wall 602 having a radius of curvature of 3.3 mm.
The cutout width w1 between and is set to 0.5 mm.

Each arcuate space 62 on the outer peripheral side has a radius of curvature of 4 m.
m side wall 621 and the fourth side wall 6 having a curvature radius of 4.5 mm.
The cutout width w2 between 22 and 22 is set to 0.5 mm. As shown in FIG. 3, each elastic piece 7 extends about 60 ° in the circumferential direction S, and as shown in FIG. 4, the end 71 and the other end 72 are peculiar to the valve holding portion 5 and the outer peripheral portion 8, respectively. Connect with different shapes.

That is, the end 71 of the elastic piece 7 is on the line S1 (see FIG. 3) obtained by extending the first side wall 601 of the arcuate space 60 on the inner circumferential side of the slit 6 in the circumferential direction S (see FIG. 3). It is connected to the lower end 520 (see FIG. 4) of the peripheral wall 52. The cross-section of the minus end 71 has an arc shape with an inner diameter of 0.5 mm. The other end 72 of the elastic piece 7 extends obliquely upward from the minus end 71 in the circumferential direction S and the radial direction R, respectively, and extends in the circumferential direction S along the third side wall 621 of the outer circumferential arcuate space 62 of the slit 6. It connects with the outer peripheral part 8 on the line S2 (refer FIG. 3) extended to. The inclination angle between the other end 72 and the end 71 is set to about 20 ° in the circumferential direction S (see FIG. 6) and about 20 ° in the radial direction R (see FIG. 4).

The valve element 3 and the disc spring 4 described above are assembled together in advance and prepared as a sub-assembly. That is, as shown in FIG. 4, the valve body 3 has its protrusion 32 inserted into the valve mounting hole 50 from the recess 53 side of the valve holding portion 5 of the disc spring 4 (see the arrow) and protruded to the upper surface 54 side. By engaging with the upper surface 54,
0 in the recess 53 of the valve holder 5 (see FIG. 5)
Can be assembled to.

Hereinafter, the valve body 3 in a sub-assembly form
A case where the safety valve 1 is configured by incorporating the disc-shaped spring 4 and the disc-shaped spring 4 into the base portion 2 will be described. First, as shown in FIG. 7, the valve housing portion 21 of the base portion 2 houses the subassembly-shaped valve body 3 and the disc-shaped spring 4. Then, the lower end 80 of the outer peripheral portion 8 of the disc-shaped spring 4 is mounted on the mounting surface 213 of the valve housing portion 21, and the sealing surface 31 of the valve body 3 is seated on the valve seat 211. After this, the top end 220 of the head 22, which is the upper end of the valve accommodating portion 21,
As shown in FIG. 1, the caulking portion 25 is simultaneously formed by caulking at four positions at equal intervals (about 90 °) in the circumferential direction S, and the outer peripheral portion 8 is fixed.

As a result, the disc-shaped spring 4 is attached to the valve accommodating portion 2
It is fixed and held at 1. Further, the valve body 3 is held in a state in which the hole 20 is closed by being biased by the biasing force of the three elastic pieces 7 of the disc-shaped spring 4 and the communication between the hole 20 and the valve accommodating portion 21 is blocked. At this time, the height h1 (see FIG. 4) from the bottom surface e of the elastic piece 7 to the lower end 80 of the outer peripheral portion 8 is 0.5 mm.
It is.

The disc-shaped spring 4 is elastically deformed upward with the lower end 80 of the outer peripheral portion 8 as a fulcrum, depending on the balance with the fluid pressure received by the valve body 3 from the hole 20 of the base 2.
You can return to the original position. The safety valve 1 of the first embodiment configured as described above is for mounting formed in the high pressure side passage 91 (see FIG. 2) in the compressor 90 incorporated in the refrigerant circulation circuit 9 of the car cooler shown in FIG. 7. The female screw hole 910 is provided with a neck lower portion 24 on the lower end side of the circular collar portion 23 of the base portion 2.
It is mounted by screwing the male screw portion 240 with the O-ring O fitted in.

When the car cooler is used, the refrigerant circulates in the refrigerant circulation circuit 9 and the pressure in the high pressure side passage 91 is maintained at a regular set pressure. In this case, the hole 20 of the base 2 of the safety valve 1 communicating with the high pressure side passage 91 is also connected to the high pressure side passage 91.
The set pressure is the same as the inside, and the valve body 3 is the disc spring 4
The hole 20 is held in a closed state by the urging force of each elastic piece 7.

Here, the safety valve 1 is, for example,
When the pressure of the high-pressure refrigerant in the high-pressure side passage 91 in the compressor 90 exceeds a prescribed (set) value and becomes high, the pressure causes the valve body 3 to resist the biasing force of the three elastic pieces 7 of the disc-shaped spring 4. To open the hole 20. Then, the minus portion of the high pressure refrigerant in the high pressure side passage 91 moves from the hole 20 to the valve accommodating portion 21.
Also, the pressure in the high-pressure side passage 91, which has been released into the atmosphere through the slit 6 and has increased, is released.

Therefore, the pressure in the high-pressure passage 91 does not become abnormally high, and damage to the refrigerant circulation circuit 9 due to abnormal pressure can be prevented. Further, when the abnormal pressure in the high-pressure side passage 91 returns to the normal pressure, the hole 20 is formed in the disc-shaped spring 4 again.
It is closed by the valve body 3 biased by the three elastic pieces 7. In the case of the safety valve 1 of the first embodiment, the outer peripheral portion 8 of the disc-shaped spring 4 is directly fixed to the valve accommodating portion 21 of the base portion 2, and the height from the lower end to the upper end, which has been conventionally required, is increased. Coil spring 4b with h2 (compressed length) (see FIG. 13)
Thus, the coil spring 4b placed on the valve body 3b can be omitted without using the stopper 5b that is held in the valve housing portion 21b in a compressed state, and the number of parts can be reduced and the manufacturing cost can be reduced.

Since the valve accommodating portion 21 of the safety valve 1 can utilize the slit 6 of the disc-shaped spring 4 as an open flow path for releasing the abnormal pressure to the outside, an extra space for forming the open flow path is secured. The internal volume can be reduced by this amount. Further, the valve accommodating portion 21 of the base portion 2 may have any axial length L1 (see FIG. 2) capable of accommodating the disc-shaped spring 4 and the valve element 3 in the sub-assembly state instead of the conventional coil spring 4b. Conventional valve housing 2 shown
It can be shortened to about 1/6 of the axial length L3 of 1b.

Therefore, the axial length L of the base 2 is the same as that of the conventional base 2.
The shaft length L4 of b can be reduced to about 1/2, and the safety valve 1 can be made compact, so that it can be installed in a small installation space. (Embodiment 2) Embodiment 2 of the present invention, a safety valve, is shown in FIGS.
It will be described based on.

The safety valve 1A of the second embodiment shown in FIGS. 9 and 10 comprises a base portion 2A, a valve body 3A and a disc-shaped spring 4A. This safety valve 1A is applied with a valve body 3A and a disc-shaped spring 4A having different configurations from the valve body 3 and the disc-shaped spring 4 used in the safety valve 1 of the first embodiment. The base 2A is
It is almost the same as the base portion 2 of the first embodiment except that the inner bottom surface 210 of the valve housing portion 21a is used as it is as a valve seat. Therefore, the description of the same configuration is omitted.

The head 22 has a depth of 4 m from the upper end side.
A valve accommodating portion 21a having an inner diameter of 9 mm and an inner diameter of 9 mm is formed. A hole 2 having a length of 12 mm and an inner diameter of 4 mm is formed in the lower neck 24 as a pressure fluid passage communicating from the lower end side to the valve accommodating portion 21a.
0a is formed. 3 A of valve bodies are the guide members 30.
And a seal member 33 formed of an O-ring held by the guide member 30.

The guide member 30 is composed of a guide shaft portion 31 which is movable by using the hole 20a as a guide, and a thick plate-shaped locking portion 32 which is formed on the upper end side of the guide shaft portion 31 and has an outer diameter larger than that of the hole 20a. . A communication passage 310 communicating with the hole 20a is formed in the guide shaft portion 31. Seal member 3
3 is held on the lower end side of the locking portion 32 of the guide member 30, is seated on the inner bottom surface 210 forming the boundary between the valve housing portion 21a and the hole 20a, and blocks the communication between the valve housing portion 21a and the hole 20a. To act.

The disc-shaped spring 4A has a central hole 5a (see FIG. 11) formed in the central portion, an outer peripheral portion 8a fixed to the valve accommodating portion 21a, and a central hole 5a extending from the outer peripheral portion 8a toward the center. It is composed of eight slits 6a which are connected to the holes 5a and arranged at equal intervals in the circumferential S direction, and eight elastic pieces 7a which are divided into the respective slits 6a. Central hole 5a
Is surrounded by the ends 70a of the elastic pieces 7a facing each other with a diameter of 1 mm.

The slits 6a have a width w4 of 0.5 mm, a length of 3 mm from the outer peripheral portion 8a to the central hole 5a, and are formed at equal intervals of about 45 ° in the circumferential direction. 8 elastic pieces 7a
Includes an outer peripheral portion 8a which is connected to the other end 70a and is fixed to the valve accommodating portion 21a of the base portion 2A. Each elastic piece 7a is a substantially isosceles triangle and serves as the top thereof, and the central hole 5
end 70a facing a, the other end 71a connected to the outer peripheral portion 8a, and the side end 72 forming both side walls of the slit 6a.
a and 73a. Side end 72a and end 70
The angle formed by a and the side end 73a is set to about 45 °.

A safety valve 1A as an assembly is constructed by incorporating the above-mentioned components. That is, first, the subassembly-shaped valve body 3A including the guide member 30 and the seal member 33 is housed in the valve housing portion 21a of the base 2A. At this time, the guide shaft portion 31 and the locking portion 32 of the guide member 30 have the hole 20 and the valve accommodating portion 21 respectively.
a. Along with this, the seal member 33 is seated on the inner bottom surface 210, and blocks the communication between the valve housing portion 21a and the hole 20a.

In this state, the lower end 80 of the outer peripheral portion 8a of the disc spring 4A is mounted on the mounting portion 213 of the valve accommodating portion 21a of the base portion 2A.
a is placed, the negative end 70a of each elastic piece 7a is brought into contact with the valve body 3A (the locking portion 32 of the guide member 30),
In addition, the upper end of the valve accommodating portion 21a is simultaneously crimped at four positions at equal intervals (about 90 °) in the circumferential direction S to form the crimped portion 25 (see FIG. 9), and the outer peripheral portion 8a is fixed.

As a result, the disc-shaped spring 4A is fixed and held in the valve accommodating portion 21a. The seal member 33 of the valve body 3A is urged by the urging force of the eight elastic pieces 7a of the disc-shaped spring 4A to close the hole 20 and keeps the communication between the hole 20a and the valve accommodating portion 21a blocked. To be done. At this time, from the bottom surface e1 of the elastic piece 7a to the lower end 80a of the outer peripheral portion 8a.
The height h1 up to (see FIG. 12) is 0.5 mm.

The disc-shaped spring 4A has a hole 20a in the base 2A.
From the balance with the fluid pressure received by the valve body 3A from
With the lower end 80a of the outer peripheral portion 8a as a fulcrum, it can be elastically deformed upward or returned to its original position. The safety valve 1B of the second embodiment configured as described above is the compressor 9 incorporated in the refrigerant circulation circuit 9 of the car cooler shown in FIG.
In the state in which the O-ring O is fitted to the lower neck portion 24 on the lower end side of the circular collar portion 23 of the base portion 2A, the male screw portion is fitted in the female screw hole for attachment 910 formed in the high pressure side passage 91 (see FIG. 10) in the 0. It is attached by screwing 240 together.

In the safety valve 1A, for example, when the pressure of the high-pressure refrigerant in the high-pressure side passage 91 in the compressor 90 exceeds a specified value and becomes high, the valve body 3 is caused by this pressure.
A moves in a direction against the biasing force of the eight elastic pieces 7a of the disc-shaped spring 4A to open the hole 20a. Then, the minus part of the high pressure refrigerant in the high pressure side passage 91 moves from the hole 20a to the valve accommodating portion 21a.
Also, the pressure in the high-pressure side passage 91, which has been released into the atmosphere through the slit 6a and has increased, is released.

Therefore, the pressure in the high pressure side passage 91 does not become abnormally high, and damage to the refrigerant circulation circuit 9 due to abnormal pressure can be prevented. Further, when the abnormal pressure in the high pressure side passage 91 returns to the normal pressure, the hole 20a is closed again by the valve body 3A biased by the eight elastic pieces 7a of the disc spring 4A. In the case of the safety valve 1A of the second embodiment, the outer peripheral portion 8a of the disc-shaped spring 4A is directly fixed to the valve accommodating portion 21a of the base portion 2A, and the coil spring 4b that has been conventionally required (see FIG. 13). And the coil spring 4b placed on the valve body 3b does not need to use the stopper 5b which holds the coil spring 4b in the valve housing portion 21b in a compressed state, and the number of parts can be reduced.
And the manufacturing cost can be reduced.

Since the valve accommodating portion 21a of the safety valve 1A can utilize the slit 6a of the disc-shaped spring 4A as an open flow path for releasing abnormal pressure to the outside, an extra space for forming the open flow path is secured. The internal volume can be reduced by this amount. In addition, the valve housing 21 of the base 2A
a may be a disc-shaped spring 4A instead of the coil spring 4b, and an axial length L1 (see FIG. 10) capable of accommodating the locking portion 32 and the seal member 33 of the valve body 3A, and the conventional valve shown in FIG. It can be shortened to approximately 1/6 of the axial length L3 of the housing portion 21b.

Therefore, the axial length L of the base portion 2A can be reduced to about 1/2 of the axial length L4 of the conventional base portion 2b, and the safety valve 1A can be made compact and can be installed in a small installation space. The values of the materials and the lengths, the angles, the heights, the diameters, the widths, the thicknesses, and the like of the constituent parts of the safety valves 1 and 1A shown in the first and second embodiments are as follows. The present invention is not limited to the above description, and various settings can be made according to the purpose. For example, safety valve 1, 1A
Is operated at an abnormal pressure higher than the normal pressure range of the fluid, that is, the safety valve 1, which varies depending on the purpose of use,
It can correspond to a fluid pressure value that activates 1A. As a result, the applications of the safety valves 1 and 1A can be widened.

[0046]

According to the safety valve of the present invention, the outer peripheral portion of the disc-shaped spring is directly fixed to the valve accommodating portion and extends from the outer peripheral portion of the disc-shaped spring in the central direction or the circumferential direction and is divided by slits. A plurality of elastic pieces and a valve element sandwiched between an opening of the hole forming the pressure fluid passage and opening to the valve accommodating portion.

For this reason, it is possible to reduce the number of parts and to eliminate the need for a coil spring and a stopper for holding the coil spring mounted on the valve body in a compressed state in the valve accommodating portion, which has been conventionally required, and to reduce the number of parts. Can be reduced. Moreover, since the coil housing and the stopper, which have been conventionally required for the safety valve, are not housed in the valve housing portion, the axial length of the valve housing portion and the base portion can be shortened, and the safety valve as a whole can be made compact.

[Brief description of the drawings]

FIG. 1 is a plan view showing a plane of a safety valve according to a first embodiment.

FIG. 2 is a sectional arrow view showing a usage example state in a portion taken along the line AA in FIG.

FIG. 3 is an enlarged plan view showing only the disc-shaped spring in FIG.

FIG. 4 is an enlarged cross-sectional arrow view showing a state where the disc-shaped spring and the valve body are attached to each other in a portion taken along the line AA in FIG.

5 is an enlarged cross-sectional view of the disc-shaped spring and the valve element taken along the line BB in FIG.

6 is an enlarged cross-sectional arrow view showing an elastic piece in a section taken along line CC in FIG.

7 is a cross-sectional arrow view showing a state before caulking in which a disc-shaped spring and a valve body are housed in a housing portion of a base portion in a portion taken along the line AA in FIG.

FIG. 8 is a schematic piping diagram showing piping of a car cooler using the safety valves of Examples 1 and 2.

FIG. 9 is a plan view showing a plane of a safety valve according to a second embodiment.

FIG. 10 is a cross-sectional arrow view showing a usage example state in a portion taken along the line A1-A1 in FIG.

FIG. 11 is a plan view showing only the disc-shaped spring in FIG. 9 in an enlarged manner.

12 is an enlarged cross-sectional arrow view showing only the disc-shaped spring in a portion taken along the line A1-A1 in FIG.

FIG. 13 is a cross-sectional view showing a cross section of a conventional safety valve.

[Explanation of symbols]

1, 1A ... Safety valve 2, 2A ... Base part 3, 3A ... Valve body
4, 4A ... Disc spring

Claims (4)

[Claims] 1. A base having a hole for forming a pressure fluid passage and a valve accommodating portion in which the hole is opened, an outer peripheral portion fixed to the valve accommodating portion, and a center or circumferential direction extending from the outer peripheral portion. A safety valve comprising a disc-shaped spring composed of a plurality of elastic pieces divided by slits, and a valve element sandwiched between the opening of the hole and the elastic piece of the disc-shaped spring. . 2. The safety valve according to claim 1, wherein the disc-shaped spring has a central portion connecting the ends of the elastic pieces in the central direction. 3. The disc-shaped spring comprises a ring-shaped outer peripheral portion and a central portion, and a plurality of elastic pieces that connect the outer peripheral portion and the central portion and are divided into slits. Safety valve. 4. The safety valve according to claim 1, wherein the valve body is held at the center of the disc-shaped spring.