JPS6034850Y2 - pressure regulating valve - Google Patents

Description

[Detailed explanation of the idea] The present application relates to a valve for regulating the pressure of gaseous fluid.

The pressure regulating valve according to the present application is applicable to a fuel tank 3 in a vaporized fuel release prevention system as shown in FIG. 1, for example.
3 interposed in a conduit 33 connecting 1 and the adsorption solution vessel 32
4 is a two-way valve used to control evaporated fuel.

The conventional pressure regulating valve has an inlet and an outlet pipe 3 as shown in Fig. 4.
It consists of a valve means 39 pressed against the casing wall surface by a spring 38 in a casing 37 provided with a diameter of 5.36, and a check valve 40 provided on the means.

A valve with such a structure has the following drawbacks.

That is, the valve operates to move the valve means 39 against the spring 38 to open the flow path to the outlet pipe 36 when vaporized fuel flows in from the inlet pipe 35 and reaches a predetermined vapor pressure or higher. However, in this case, as the steam pressure approaches the valve opening pressure, the steam pressure and the repulsive force of the spring 38 come close to being balanced, and with the addition of external influences such as vibrations, the predetermined valve opening pressure is reached. There is a risk that the valve means 39 may have been opened previously.

This drawback becomes particularly noticeable when the valve opening pressure is set to a minute value.

Furthermore, since the valve means 39 and the check valve 40 are provided separately, there is a risk that the valves may open incorrectly, which reduces reliability accordingly.

That is, if one valve (valve means 39 or check valve 40) becomes defective, the entire valve becomes defective.

In view of the above, the present application provides a pressure regulating valve that does not open at a fluid pressure lower than a predetermined valve opening pressure and has a structure in which a single valve body performs two valve functions. be.

To describe an embodiment, FIG. 2 shows a pressure regulating valve 10 of the present invention, which is composed of a cover 1, a body 2, a diaphragm means 3, a valve means 4, and a cap 5.

The cover 1 is dish-shaped and has a communicating vibro on the outside of its center, and has a stopper means 7 on the inside of its center.
has.

The stopper means 7 is arranged so that the plurality of structures 43 are spaced apart from each other and erected inside the center of the cover 1.

The body 2 has a substantially cylindrical shape with one end open and the other end provided in the center with an annular valve housing 13 that protrudes inward, and further below the housing is a communication pipe 8. is provided.

Also, the body 2 located above the valve housing 13
A communication path 11 extending along the inner wall of the body is formed in the body.

One end of the valve housing 13 is open, and the other end has an annular shoulder portion 41 and a guide member 12 connected to the annular shoulder portion 41.
and has.

The diaphragm means 3 has a central part of the diaphragm 18,
It has a spring retainer 20 provided with a lever 19.

A cover 1 is attached to the open end of the body 2 to form a chamber therebetween.

The formed chamber is divided into chamber A and chamber B by diaphragm means 3 held between body 2 and cover 1.

21 is Bush.

Retainer 20 of diaphragm 18 and valve housing 1
A spring 22 is compressed between the shoulder portion 41 of No. 3 and the shoulder portion 41 of No. 3.

The open end of the valve housing 13 is closed by a spring seat 16 provided with an opening 42 to form a chamber C therein.

A valve means 4 formed of a valve body 15 and a spring 14 is disposed in the chamber C, and a valve is formed between the valve body 15 and the shoulder portion 41 of the valve housing 13.

The lever 19 of the diaphragm means 3 is connected to the guide member 12
guided by.

A cap 5 is provided on the closed end side of the body 2 to form a communication path 17 between the cap 5 and the closed end, and the communication path communicates with the communication path 11 of the body 2.

In the state shown in Fig. 2, chamber A and chamber C are connected to the communication passage 11.17,
The chambers C and B communicate with each other through an opening 42, and are isolated from each other by a valve body 15.

The pressure receiving area ratio between the valve body 15 and the diaphragm 18 and the elastic force of the spring 14.22 are determined by design so that the valve body 15 opens and closes at a predetermined set pressure.

FIG. 3 shows another embodiment, in which a conduit 25 is disposed between the communication pipes 26 and 27 instead of the communication passage 11, 17 in FIG.

In FIG. 3, components similar to those in FIG. 2 are given the same reference numerals.

When the pressure regulating valve described above is used as a fuel vapor release prevention system as shown in FIG. 1, the communicating vibro is connected to the fuel tank, and the communicating pipe 8 is connected to the adsorption container.

In that case, in FIG. 2, the evaporated fuel from the fuel tank flows into the valve 10 from the communicating vibro, reaches the chamber C via the chamber A1 communicating passages 11 and 17, and moves the valve body 15 to the shoulder portion of the valve housing 13. 41 is pressed.

As a result, the valve body 15 and the shoulder portion 41 come into closer contact, and the sealing performance is strengthened.

When the vapor pressure of the evaporated fuel increases, the diaphragm 18
The diaphragm 18 moves to the left against the spring 22.
The tip of the lever 19 provided in the valve body 15 contacts the valve body 15 inside the valve housing 13, and further presses the valve body 15 to open the space between the valve body 15 and the shoulder portion 41, thereby communicating the chambers C and B. leading to.

Then, the vaporized fuel flows out from the chamber B through the communication pipe 8 and into the adsorption container.

When the inside of the fuel tank becomes negative pressure, the inside of the chamber A in the valve 10 and the chamber C communicating with it are sucked and a negative pressure state is formed. The valve is opened and air is sucked in from the adsorption container to compensate for the negative pressure inside the fuel tank.

In the above description, the pressure regulating valve has been described as being used as an evaporative fuel release prevention system, but it goes without saying that the valve can also be used as an exhaust gas recirculation system.

As described above, in the valve of the present invention, when the fluid pressure is below a predetermined valve opening pressure, the fluid acts in the direction of closing the valve, and when the pressure exceeds the predetermined pressure, the valve is opened by fluctuation of the diaphragm means. Therefore, there is no fear that the valve will open at a pressure lower than the set valve opening pressure, and accurate valve opening characteristics can be obtained.

Further, since the two-way valve opening is performed only by the valve body of the valve means, the reliability of the valve is improved.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of a vaporized fuel release prevention device equipped with a pressure regulating valve, FIG. 2 is a sectional view of the pressure regulating valve of the present invention, FIG. 3 is a sectional view showing another embodiment, and FIG. FIG. 4 shows a sectional view of a conventional valve. 1... Cover, 2... Body, 3... Diaphragm means, 4... Valve means.

Claims (1)

[Scope of utility model registration request] A chamber is formed by a cover provided with a communicating pipe and a body provided with a communicating pipe, and the chamber is divided into a chamber A and a chamber B by a diaphragm means comprising a retainer having a lever in the center of the diaphragm. The communication pipe of the cover is connected to chamber A, the communication pipe of the body is connected to chamber B, a valve housing having a shoulder portion is provided in chamber B, a chamber C is formed in the housing, and chamber C is connected to chamber C. A valve means consisting of a spring and a valve body is provided, the valve is formed between the valve body and a shoulder portion of the valve housing, and a spring is compressed between the shoulder portion of the valve housing and a retainer of the diaphragm means. , providing a communication path between chamber A and chamber C,
A pressure regulating valve comprising a lever of a diaphragm means facing a valve body of the valve means.