JP2807642B2 - Mounting structure of diaphragm with base cloth - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for a diaphragm containing a base cloth in which a base cloth for reinforcement is insert-molded, and more particularly, to prevent leakage of a fluid generated through the base cloth. Mounting structure for a vehicle.

[0002]

2. Description of the Related Art Conventionally, a diaphragm having a reinforcing base fabric inserted therein has been used. Diaphragms with a base cloth are widely used when the strength of a diaphragm made of ordinary rubber alone is not sufficient. A diaphragm containing a base cloth is manufactured by mounting a base cloth woven of resin fibers or the like on a rubber molding machine and forming rubber around the base cloth by insert molding. FIG. 6 shows a conventional mounting structure when a diaphragm containing a base cloth is used for a fluid supply valve. Diaphragm 12 with a base cloth in which base cloth 11 is insert-molded
The pressing portion 12a formed on the outer periphery of the main body is housed in a housing groove 14a formed in the main body lower member 14. The main body upper member 13 is fastened to the main body lower member 14 by a bolt (not shown).

The base cloth-containing diaphragm 12 housed in the housing groove 14a is pressed from above by the main body upper member 13, and is elastically deformed by being sandwiched between the main body upper member 13 and the main body lower member 14. The main body upper member 13 is in contact with the main body lower member 14 through the contact surface 15. Fluid flowing inside the main body lower member 14 is blocked from leaking by a pressing surface between the base cloth-containing diaphragm 12 and the main body lower member 14. Also,
The fluid flowing inside the main body upper member 13 is blocked from leaking by the pressing surface of the base cloth-containing diaphragm 12 and the main body upper member 13. On the other hand, a small hole called a bleed orifice hole 12b is formed in the movable portion of the diaphragm valve. This is to drive the diaphragm valve with a pilot solenoid valve by connecting both sides of the diaphragm with bleed orifice holes.

[0004]

However, the conventional structure for mounting the diaphragm 12 with the base cloth has the following problems. That is, the bleed orifice hole is
Diaphragm 1 containing base cloth by insert molding base cloth 11
Drilled after molding 2. Therefore, the cut surface of the base cloth 11 appears on the surface of the bleed orifice hole. Further, since the outer periphery of the base cloth-containing diaphragm 12 is also manufactured by punching, the base cloth 11 appears on the outer peripheral end face of the base cloth-containing diaphragm 12. Therefore, the fluid flowing inside flows out from the bleed orifice hole to the outer peripheral end surface of the diaphragm 12 with the base cloth along the resin fibers constituting the base cloth 11, and the contact surface 15 between the main body upper member 13 and the main body lower member 14. From the outside.

[0005] The problem is that the gasket supply valve used in a gas station or the like has a problem in that the diaphragm 12 containing a base cloth is used.
This was a particular problem when using. That is, in order to have durability against gasoline, the base material-containing diaphragm 12 is often made of fluororubber. However, since fluororubber has poor adhesiveness to the base fabric 11, the base fabric 11 and the fluororubber are used. This is because a gap may be generated between them, and gasoline may leak through the gap around the base cloth 11. And, of course, at gas stations, a small amount of gasoline leakage is a problem for safety.

An object of the present invention is to provide a diaphragm 1 with a base cloth.
An object of the present invention is to provide a mounting structure for the base cloth-containing diaphragm 12 for realizing a supply valve that does not cause leakage even when the second valve 2 is used.

[0007]

In order to achieve this object, a mounting structure of a base cloth-containing diaphragm according to the present invention comprises an outer peripheral portion of a base cloth-containing diaphragm in which a reinforcing base cloth is insert-molded. A mounting structure for a base cloth-containing diaphragm fixed to a valve body, comprising a pair of valve body members that sandwich the outer peripheral portion of the diaphragm and press from above and below, and a storage groove formed in the valve main body member to house the outer peripheral portion of the diaphragm. And a gasket that is attached around the outer end surface of the outer peripheral portion of the diaphragm of the storage groove and that is sealed by being pressed by the pair of main body members. Further, in the mounting structure for a diaphragm with a base cloth according to the present invention, in the above-mentioned mounting structure, the gasket wraps around an outer peripheral end surface of the diaphragm, an upper surface and a lower surface continuous with the end surface.

Next, the operation of the base cloth-containing diaphragm having the above configuration will be described. The pair of valve body members of the mounting structure of the base cloth-containing diaphragm according to the present invention having the above-described configuration presses the outer peripheral portion of the diaphragm from above and below. Further, the storage groove formed in the valve body member stores the outer peripheral portion of the diaphragm. In addition, the gasket attached around the outer end surface of the outer peripheral portion of the diaphragm of the storage groove,
Sealing is performed by being pressed by the pair of body members. As a result, even if the fluid inside the valve leaks through the base cloth 11 that has appeared on the bleed orifice hole and the outer peripheral end face of the base cloth-containing diaphragm 12, the gasket is pressed against the main body upper member 13 and the main body lower member 14 to be in close contact As a result, fluid does not leak outside from the gasket.

Further, since the gasket encloses the outer peripheral end face of the diaphragm, the upper surface and the lower surface continuous with the end surface, the inner surface of the gasket and the upper surface and the lower surface of the diaphragm come into contact with each other to press and interrupt the first stage. Then, since the outer surface of the gasket and the valve body member are pressed against each other to perform the second stage of blocking, the seal is doubled, and the leakage of the fluid can be completely blocked. In addition, the gasket can be built into the diaphragm before it is built into the valve,
The gasket and the diaphragm can be integrally attached to the valve, and the production efficiency can be increased.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a mounting structure of a base cloth-containing diaphragm according to an embodiment of the present invention. First, the structure of the gasoline supply valve will be described with reference to FIGS. FIG. 3 is a plan view of the gasoline supply valve, FIG. 4 is a sectional view taken along line BB of FIG. 3, and FIG. 5 is a partial sectional view taken along line AA of FIG. The gasoline supply valve is largely divided into a diaphragm valve section 20 and a pilot solenoid valve section 30. As shown in FIG. 4, the outer peripheral portion of the base cloth-containing diaphragm 12 is fixed between the main body lower member 14 and the main body upper member 13 constituting the valve main body. The central portion of the base fabric-containing diaphragm 12 is sandwiched between an upper bracket 21 and a lower bracket 22 and is integrally caulked and fixed by a bracket stopper 23.

The lower surface of the base cloth-containing diaphragm 12 comes into contact with or separates from the valve seat 24. The upper bracket 21 reinforces the back side of the portion where the base cloth-containing diaphragm 12 contacts the valve seat 24. As the base cloth 11 of the present embodiment,
A fiber woven from resin fibers such as aramid fiber and polyester fiber having a diameter of about 0.2 mm is used. The base cloth-containing diaphragm 12 is formed of fluoro rubber with the base cloth 11 inserted therein. This is to ensure durability against gasoline. A cylindrical portion is formed on the lower side of the lower bracket 22, and the cylindrical portion is fitted to the inner surface of the valve seat 24 so that the central portion of the diaphragm 12 with the base cloth slides up and down. Plays the role of guide. A return spring 25 is provided between the upper bracket 21 and the main body upper member 13 to urge the base cloth-containing diaphragm 12 in a direction in which the diaphragm 12 comes into contact with the valve seat 24. A diaphragm chamber 27 is formed above the base cloth-containing diaphragm 12.

The outside of the lower surface of the diaphragm 12 containing the base cloth is
It communicates with the input port 26. The inside of the valve seat 24 communicates with the output port 38. Diaphragm 1 with base cloth
2 is in contact with the valve seat 24, the input port 26 and the output port 38 are shut off, and the diaphragm 1
2 is separated from the valve seat 24 so that the input port 26
And the output port 38. A bleed orifice hole 12b having a diameter of 1 mm is formed in the diaphragm 12 containing the base cloth.
Are formed. The bleed orifice hole 12b keeps the diaphragm chamber 27 and the input port 26 in communication at all times.

As shown in FIG. 5, the diaphragm chamber 27
Is connected to an output port 38 through a communication passage 28, a pilot valve input port 39, and a pilot valve output port 36. A pilot valve seat 35 is formed between the pilot valve input port 39 and the pilot valve output port 36. A pilot valve body 34 made of rubber is in contact with the pilot valve seat 35. The pilot valve body 34 is fixed to the plunger 33. The plunger 33 is slidably fitted in the hollow portion of the coil 31, as shown in FIG. A fixed iron core 32 is fixedly provided above the hollow portion of the coil 31. Further, the plunger 33 is configured such that the pilot valve body 34 is
5 is urged in the direction in which it abuts.

Next, the mounting structure of the base cloth-containing diaphragm 12, which is a main part of the present invention, will be described with reference to FIG. FIG. 1 is an enlarged cross-sectional view of a mounting portion of the base cloth-containing diaphragm 12. The base cloth 11 is insert-molded inside the base cloth-containing diaphragm 12. Diaphragm 12 with base cloth
The pressing portion 1 having a bulge on the lower side over the entire circumference
2a is formed. The pressing portion 12a is attached to the lower body member 1.
4 is housed in a housing groove 14 a formed in the housing 4. A gasket 17 is attached so as to wrap the outer end surface of the pressing portion 12a, the upper surface and the lower surface continuous with the end surface. The gasket 17 has a U-shaped cross section. The inner portion 17a is in contact with the upper and lower surfaces of the pressing portion 12a, and the outer portion 17b is on the lower surface of the main body upper member 13 and the inner surface of the storage groove 14a of the main body lower member 14. Abut. In addition, on the lower surface of the main body upper member 13,
A convex portion 13a is formed and is in direct contact with the base cloth-containing diaphragm 12.

Next, the operation of the gasoline supply valve having the above configuration will be briefly described. First, a state in which the coil 31 is not energized will be described. Bleed orifice hole 1
2b, the fluid pressure on the input port 26 side is transmitted to the diaphragm chamber 27, the fluid pressure on the output port 38 is low, and the force for pushing up the diaphragm 12 containing the fabric is weaker than the force for pushing the diaphragm 12 containing the fabric downward. And is urged by the return spring 25,
The base cloth-containing diaphragm 12 is in contact with the valve seat 24. The pilot valve body 34 is in contact with the pilot valve seat 35, and the diaphragm chamber 27 and the output port 38 are shut off.

Next, by energizing the coil 31,
The plunger 33 is sucked toward the fixed iron core 32, and the pilot valve body 34 is separated from the pilot valve seat 35. Then, the diaphragm chamber 27 and the output port 38 communicate with each other. As a result, the fluid in the diaphragm chamber 27 flows to the output port 38, but the bleed orifice hole 12b is small and the flow rate flowing through the bleed orifice hole 12b is small.
It drops sharply compared to the pressure of 6. Therefore, the diaphragm 12 with the base cloth is moved upward by the pressure of the input port 26, the diaphragm 12 with the base cloth is separated from the valve seat 24, and the input port 26 and the output port 38 communicate with each other.

Next, when the energization of the coil 31 is stopped,
The plunger 33 is slid downward by the return spring 37, and the pilot valve body 34 contacts the pilot valve seat 35. Then, the communication between the diaphragm chamber 27 and the output port 38 is cut off. As a result, the fluid pressure in the diaphragm chamber 27 increases through the bleed orifice hole 12b, the diaphragm 12 with the base cloth moves downward, the diaphragm 12 with the base cloth abuts on the valve seat 24, and the input port 26 and the output port Communication with the port 38 is cut off.

Next, the operation of the structure for mounting the base cloth-containing diaphragm will be described. As mentioned, gasoline is always
It contacts the side wall of the bleed orifice hole 12b. Therefore, it penetrates from the end face of the base cloth 11 exposed on the side wall of the bleed orifice hole 12b, and gradually leaks to the end face of the base cloth 11 exposed on the end face of the pressing portion 12a through the base cloth. This is because the adhesiveness between the base fabric 11 made of resin fibers and the fluororubber is poor. However, according to the mounting structure of the base cloth-containing diaphragm of the present embodiment, the gasket 17 is attached to the base cloth-containing diaphragm 1 by the inner portion 17a.
The gasoline leaked from the base cloth 11 exposed on the end face of the pressing portion 12a because it is in contact with the upper and lower surfaces of the pressing portion 12a and is pressed by the upper body member 13 and the lower body member 14. Can be.

Further, the outer portion 17b of the gasket 17 abuts against the lower surface of the upper body member 13 and the upper surface of the storage groove 14a of the lower body member 14, and the upper body member 13 and the lower body member 1
4, even if leakage occurs from the pressing surface of the inner portion 17 a and the pressing portion 12 a, the leakage can be completely blocked by the pressing surface. That is, the blocking means of the present embodiment includes the inner portion 17a and the pressing portion 12a.
The first step is interrupted on the pressing surface with
The second stage interruption is performed on the contact pressing surface of the main body 7b and the main body upper member 13 and the main body lower member 14. As described above, since the leakage is blocked twice, the leakage of gasoline can be completely blocked. Further, since the gasket 17 surrounds the pressing portion 12a, the gasket 17 can be incorporated in the base fabric-containing diaphragm 12 in advance, and the workability of attaching the base fabric-containing diaphragm 12 and the gasket 17 to the valve body can be improved. it can.

Next, another embodiment of the present invention will be described. Since the configuration of the gasoline supply valve is the same as that of the above-described embodiment, only the mounting structure of the base cloth-containing diaphragm will be described. FIG. 2 is an enlarged cross-sectional view showing the mounting structure of the base cloth-containing diaphragm. In the present embodiment, a commercially available O-ring 16 is used as the gasket 17. That is, the pressing portion 1
An O-ring 16 is attached to the outer side of the outer peripheral end surface of 2a, and the upper surface of the O-ring 16 is brought into contact with the lower surface of the upper body member 13, and
The lower surface of the ring 16 is in contact with the upper surface of the storage groove 14a of the main body lower member 14. Then, the O-ring 16 is pressed by the main body upper member 13 and the main body lower member 14, and gasoline leaking from the base cloth 11 exposed on the end face of the pressing portion 12 a is blocked by the pressing surface. According to the present embodiment, a commercially available O-ring 1 can be used without using the special gasket 17.
6 can be used, and the sealing performance is slightly deteriorated because the seal is one layer as compared with the case where the gasket 17 is used, but the cost can be reduced.

As described above in detail, according to the mounting structure of the base cloth-containing diaphragm of the present embodiment, the pressing portion 12a of the base cloth-containing diaphragm 12 in which the reinforcing base cloth 11 is insert-molded is formed. A mounting structure of a base cloth-containing diaphragm fixed to the valve body, comprising a pair of a main body upper member 13, a main body lower member 14, and a main body lower member 14 that sandwich the pressing portion 12 a of the base cloth-containing diaphragm 12 and press from above and below. And a storage groove 14a for storing the pressing portion 12a
And a pair of upper body member 13 and lower body member 14, which are attached to storage groove 14 a around the outer end surface of pressing portion 12 a.
Gasket 17 that seals by being pressed by the bleed orifice hole and the base cloth 11 that appears on the outer peripheral end face of the base cloth-containing diaphragm 12 to leak gasoline inside the valve. Since the gasket is pressed and adhered to the main body upper member 13 and the main body lower member 14, gasoline does not leak outside from the gasket.

Particularly, in the mounting structure of the diaphragm with the base cloth of the present embodiment, since the gasket 17 wraps the end face of the pressing portion 12a, the upper surface and the lower surface continuous with the end surface, the inner portion 17a of the gasket 17 The upper surface and the lower surface of the pressing portion 12a abut against each other to perform a first-stage interruption, and the outer portion 17b of the gasket 17 abuts against the main body upper member 13 and the main body lower member 14 to perform the second stage interruption. So do
The seal is doubled, and leakage of fluid can be completely shut off. Before assembling into the valve, gasket 1
7 can be incorporated into the diaphragm 12 with the base cloth,
The gasket 17 and the base cloth-containing diaphragm 12 can be integrally attached to the valve, and the production efficiency can be increased.

Although the gasoline supply device of the present invention has been described in detail based on the embodiment, the present invention is not limited to the above embodiment, and various modifications are possible. In the present embodiment, the storage groove is formed on the main body lower member 14 side.
The same applies to the case where it is formed on both sides of the main body lower member 14 and the main body upper member 13.

[0024]

As is apparent from the above description, according to the mounting structure of the base cloth-containing diaphragm of the present invention, the outer periphery of the base cloth-containing diaphragm in which the reinforcing base cloth is insert-molded is formed. A mounting structure for a base cloth-containing diaphragm fixed to the valve body, comprising a pair of main body members that sandwich the outer peripheral part of the base cloth-containing diaphragm and press from above and below, and a storage groove formed in the main body member to store the outer peripheral part. And a gasket that is mounted around the outer end surface of the pressing portion in the storage groove and seals by being pressed by the pair of main body members, so that the bleed orifice hole and the outer peripheral end surface of the base cloth-containing diaphragm are provided. Even if the fluid inside the valve leaks through the base fabric that appeared, the gasket is pressed against the body member and adheres tightly, so the fluid does not leak outside from the gasket. There.

In particular, in the mounting structure of the base cloth-containing diaphragm according to the present invention, since the gasket encloses the end face of the outer peripheral portion of the base cloth-containing diaphragm, the upper surface and the lower surface continuous with the end surface, the inner part of the gasket and the diaphragm. The upper surface and the lower surface of the outer peripheral portion abut against each other to perform the first-stage interruption, and the outer portion of the gasket and the main body member abut against each other to perform the second-stage interruption. Leakage can be completely blocked. Further, before the assembly into the valve, the gasket can be incorporated into the diaphragm with the base fabric, and the gasket and the diaphragm with the base fabric can be integrally attached to the valve, so that the production efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a mounting structure of a diaphragm with a base cloth according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a mounting structure of a diaphragm with a base cloth according to another embodiment of the present invention.

FIG. 3 is a plan view of a gasoline supply valve in which a structure for mounting a diaphragm containing a base cloth is implemented.

FIG. 4 is a sectional view taken along the line BB of FIG. 3;

FIG. 5 is a partial sectional view taken along the line AA of FIG. 3;

FIG. 6 is an enlarged sectional view showing a conventional structure for mounting a diaphragm containing a base cloth.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Base cloth 12 Diaphragm containing base cloth 12a Pressing part 12b Bleed orifice hole 13 Upper member of main body 14 Lower member of main body 14a Storage groove 16 O-ring 17 Gasket 17a Inner part 17b Outer part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16J 3/00-3/06 F16J 15/52

Claims (2)

(57) [Claims] 1. A mounting structure of a base cloth-containing diaphragm for fixing an outer peripheral part of a base cloth-containing diaphragm in which a reinforcing base cloth is insert-molded to a valve body, wherein the outer peripheral part of the diaphragm is sandwiched from above and below. A pair of valve body members for pressing; a storage groove formed in the valve body member for storing an outer peripheral portion of the diaphragm; and a pair of the storage grooves being attached around an outer end surface of an outer peripheral portion of the diaphragm in the outer peripheral portion of the diaphragm. Seals by being pressed by the valve body member of the diaphragm,
Is a mounting structure for a diaphragm with a base cloth, comprising a separate gasket. 2. The mounting structure according to claim 1, wherein the gasket encloses an outer peripheral end surface of the diaphragm, and an upper surface and a lower surface continuous with the end surface. .