JPS61262282A - Valve mechanism - Google Patents

Abstract

PURPOSE:To improve the operation reliability by installing a valve body which is opening/closing-operated by a pressure into a pressure chamber R having an opened port, thus permitting the valve opening/closing operation free from the contact of the valve body with liquid and suppressing the influence of the liquid level. CONSTITUTION:A valve body 22 which is opening/closing-operated by a pressure is installed into a pressure chamber R having an opened port. When, with such constitution, a gas-liquid separating chamber 8 is filled with liquid, and the liquid level in the gas-liquid separating chamber 8 rises, the pressure in a pressure chamber R increases, and the valve body 22 is closed. Therefore, the valve body 22 is not given with the influence of the vibration of liquid, and biting of foreign material is suppressed, and the operation reliability of the valve mechanism can be improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a device for preventing liquid from flowing out from the gas outflow path by providing a gas outflow path of a gas-liquid separation chamber provided on the discharge side of a pump, for example. This invention relates to a valve mechanism suitable for.

[Prior art] For example, in a refueling system at a gas station, a refueling nozzle supplies oil pumped up by a pump into a car's fuel tank, but air is mixed in the oil, albeit in a small amount. Therefore, a gas-liquid separator is installed on the discharge side of the pump.
Oil containing a relatively large number of bubbles is separated into gas and oil in a gas-liquid separation chamber, the gas is released to the atmosphere, and the liquid is returned to the pump.

Therefore, the gas-liquid separation chamber is provided with a float valve that allows oil to flow out to the pump side when a certain amount of separated oil has accumulated, and a vent pipe that is a gas outflow path.

However, if for some reason a large amount of liquid flows into the gas-liquid separation chamber at once, the inflow becomes larger than the outflow from the float valve, causing oil to fill the gas-liquid separation chamber and flow out from the vent pipe. There is a danger. For this purpose, the vent pipe of the gas-liquid separation chamber is provided with a valve mechanism that closes when the gas-liquid separation chamber is filled with oil (for example,
(Refer to Publication No.-27483).

This conventional valve mechanism uses a float to sense the oil that fills the gas-liquid separation chamber, and is therefore prone to malfunction due to foreign objects being caught in it. There was a problem that it was easily influenced by

[Object of the Invention] Therefore, an object of the present invention is to provide a valve mechanism with improved operational reliability.

[Structure of the Invention J The valve mechanism according to the present invention includes a pressure chamber having an opening and a valve body that opens and closes the valve by pressure.

[Operations and Effects of the Invention] Therefore, when the gas-liquid separation chamber is filled with liquid and the ground level within the gas-liquid separation chamber rises, the pressure in the pressure chamber rises due to the rise in the liquid level. This pressure increase causes the valve to close. The inside of the pressure chamber is filled with gas (air), so
It is unaffected by vibrations and ripples in the liquid, and no foreign matter gets caught.

As a result, the operational reliability of the valve mechanism is improved.

[Preferred Embodiment] When carrying out the present invention, it is preferable that the valve body is mounted on a diaphragm that covers the upper part of the pressure chamber. Furthermore, when implementing the present invention, the diaphragm is made of an oil-resistant elastic material such as oil-resistant rubber, the convolution is widened to reduce operating resistance, and a long skirt is formed, and a disk is overlapped on a part of the convolution to make it effective. It is preferable to secure the area.

In this way, the valve body can be actuated by the slight pressure in the pressure chamber. Furthermore, when carrying out the present invention, it is preferable to provide a partition wall with pores formed below the diaphragm of the pressure chamber. In this way, it is possible to restrict the air passing through the pores and suppress sudden valve operation. Furthermore, when carrying out the present invention, the valve body has a thin, shallowly angled lip made of an oil-resistant elastic material, such as oil-resistant rubber,
It is preferable to use a small diameter neck or a tongue seal. In this way, the frontage can be sealed with slight pressure.

[Example] The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram of a pump device incorporating a gas-liquid separation chamber 8 having a valve ms according to the present invention, and FIG. 2 is a side view of the pump device. 1 and 2, the pump device includes a casing C, and the casing C is provided with an inlet I and an outlet O for liquid.

A check valve 1 is provided at the inner end of the inlet (2), and opens into a chamber 2 provided with a strainer 2a on the inlet side. A pump 3 is provided approximately in the center of the casing C.

This pump 3 has a suction port 3a and a discharge port 3b, and the discharge port 3b of the pump 3 communicates with a gas-liquid separation device 4. In this gas-liquid separator 4, a liquid path is configured such that the liquid without bubbles flows into a chamber 5 provided with a strainer 5a on the outflow side, and between the strainer chamber 5 on the outflow side and the outflow port O. is provided with a control valve 6.

A bypass valve 12 is provided in a liquid passage 11 of the gas-liquid separation device 4, and this liquid passage 11 communicates with the suction port 3a of the pump 3.

On the other hand, in the gas-liquid separator N4, the liquid containing bubbles flows through the liquid path 13.
It is designed to flow. This liquid path 13 is formed in the side cover of the casing.

This liquid path 13 communicates with a gas-liquid separation chamber 8, which will be described later. The gas separated in the gas-liquid separation chamber 8 is released into the atmosphere from the air vent 14, and the liquid from which the gas has been separated flows into the liquid path 15. This liquid path 15 has a check valve 9.
is provided, and this liquid path 15 communicates with the strainer v2 on the inflow side. In the gas-liquid separation chamber 8, there is provided a valve mechanism 7 of the present invention that controls the outflow of gas released into the atmosphere from the air vent 14, and a liquid outflow control valve that controls the liquid flowing into the strainer chamber 2 through the liquid path 15. 1
0 is set.

Therefore, when the pump 3 is rotated by a suitable prime mover, the liquid flows from the inlet port ■ to the check valve 1 and the strainer chamber 2 on the inflow side.
, pump 3, gas-liquid separator @ 4, strainer chamber 5 on the outflow side
, and is discharged from the outlet O through the control valve 6.

Also, part of the liquid from the gas-liquid separator 4 is transferred to the bypass valve 1.
2 and is bypassed to pump 3. On the other hand, in the gas-liquid separator 4, the liquid containing gas flows into the gas-liquid separation chamber 8, where the gas is discharged from the air vent 14, and the liquid is returned to the strainer chamber 2 on the inflow side via the check valve 9.

At that time, the gas-liquid separation chamber 8 is provided with a valve mechanism 7 for controlling gas outflow.
is provided, so that even if the gas-liquid separation chamber 8 becomes filled with liquid due to an unexpected situation, the valve of the valve mechanism 7 will close and the liquid will not be discharged from the air vent 14. Further, the liquid outflow control valve 10 is configured to cause the liquid to flow into the liquid path 15 when a certain amount of liquid has accumulated in the gas-liquid separation chamber 8.

Next, the present invention will be explained in detail with reference to FIGS. 3, 4, and 5. In the figure, the lid 16 is provided with a passage 14a that communicates with the air vent 14, and this passage 14a is connected to the lid 16.
6 and ends at a downwardly directed opening 14b. A valve mechanism, generally indicated by the reference numeral 7, is used to open and close this frontage 14b. This valve mechanism 7 is attached to the mounting portion 1 of the lid body 16.
A valve body 22 is attached to a diaphragm 21 that covers the upper end of the cylinder 20, and as shown in FIG. When it moves upward, the opening 14b
is set to be closed.

An opening 20a is formed in the lower part of the cylinder 20, and a pressure chamber R is formed by closing the opening 20a with liquid. A partition wall 20b having pores 20c is formed in the pressure chamber R to prevent sudden valve operation. Furthermore, a descending restriction piece 20d that restricts the descending of the valve body 22 is protruded from the upper surface of the partition wall 20b.

The diaphragm 21 is attached to the upper outer periphery of the cylinder 20 with its outer periphery sandwiched by a mounting ring 20e, and its center portion is sandwiched between an F-side disk 21a and an upper disk 21b. This diaphragm 21 is preferably made of an oil-resistant elastic material such as oil-resistant rubber, has a wide convolution to reduce operating resistance, and has a long skirt so that it can be deformed by the slight pressure of the pressure chamber R. .

The valve body 22 is fitted onto the upper outer periphery of the upper disk 21b and fixed by a presser spring 22c. The valve body 22 has a thin, shallowly angled lip 22a made of an oil-resistant elastic material such as oil-resistant rubber, and has a neck portion 22b.
It is preferable to use a lip seal with a small diameter to seal the opening 14b with a slight pressure.

Next, a liquid outflow control valve 10, generally designated by the reference numeral 10, has a lid body 1.
A float rod 25 is provided which is pivotally connected to a bracket 23 formed integrally with the float rod 6 by means of a pin 24, and a float 26 is attached to the float rod 25. A valve body 27 is pivotally connected to the float rod 25 via another bin 28 on the flow 26 side rather than the pivoting bin 24. The valve body 27 is adapted to open and close the opening 15a of the liquid path 15.

Therefore, the liquid containing gas flows from the liquid path 13 into the gas-liquid separation chamber 8.
When the gas and liquid flow into the gas-liquid separation chamber 8, the gas and liquid are separated. Then, the gas is discharged into the atmosphere from the air vent 14 through the upper opening 14b opened by the valve body 22, which is positioned with the lower disk 21a being engaged with the lowering restriction piece 20d. On the other hand, the liquid accumulates below the gas-liquid separation chamber 8.

As a result, the float 26 floats in the direction shown by the chain line 26a. Then, the valve body 27 opens, and the liquid accumulated in the gas-liquid separation chamber 8 flows out into the liquid path 15 through the opening 15a.

For example, if the liquid outflow control valve 10 fails and the opening 15a remains closed, liquid will flow into the gas-liquid separation chamber 8, causing the liquid level W1 to rise as shown in FIG. When the liquid comes into contact with the opening 20a, air is confined within the pressure chamber R. As the liquid continues to flow further, the liquid level W outside the cylinder 20
1 rises, but the liquid level W2 in the pressure chamber R cannot rise because it is filled with air, resulting in a liquid level difference (Wl - W2).

This liquid level difference increases the pressure of the air in the pressure chamber R, causing the diaphragm 21 to bulge upward. As a result, the valve body 22 moves upward to close the opening 14b and prevent the liquid from flowing out. Although the diaphragm 21 is used in this embodiment, it can be replaced with a piston that slides into the cylinder 20.

[Summary] As described above, according to the present invention, a valve body that opens and closes the valve by pressure is provided in a pressure chamber having an opening, so that the valve body does not come into contact with liquid and opens and closes the valve by the pressure of the pressure chamber. Not affected by liquid level.

As a result, the operational reliability of the valve mechanism is improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the overall flow of gas and liquid in a pump device embodying the present invention, FIG. 2 is a side view of a pump device embodying the present invention, and FIG. 4 and 5 are side sectional views of the gas-liquid separation chamber, showing the operating states of the present invention when the valve is opened and when the valve is closed. R...Pressure chamber 7...Valve mechanism 20...
Cylinder 21...Diaphragm 22...Valve body Fig. 2 Fig. 3 Fig. 4 Fig. 0a Fig. 5 0a

Claims (1)

[Claims] A valve mechanism characterized in that a pressure chamber having an opening is provided with a valve body that opens and closes the valve by pressure.