JPH0221086A - float valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a float valve, and particularly to a float valve used as a gas outflow control valve in a gas-liquid separation chamber provided on the discharge side of a pump.

[Prior Art] Regarding a gas-liquid separation chamber, the present applicant has previously disclosed Japanese Patent Application Laid-Open No. 118-1983.
This is proposed in Japanese Patent No. 568, and will be explained with reference to FIGS. 2 and 3.

FIG. 2 is a schematic diagram of a pump device incorporating the gas-liquid separation chamber 8, and FIG. 3 is a side sectional view of the gas-liquid separation chamber 8. The pump device comprises a casing C, which is provided with a liquid inlet I and an outlet 0. Inlet ■
A check valve 1 is provided at the inner end and opens into a strainer chamber 2 on the inflow side. An internal gear 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 that does not contain air bubbles flows into a strainer chamber 5 on the outflow side, and a control valve is provided between the strainer chamber 5 on the outflow side and the outlet O. 6 is provided.

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, the liquid containing air bubbles in the gas-liquid separator 4 flows through the liquid path 13.
It is designed to flow. This liquid path 13 communicates with a gas-liquid separation chamber 8, which will be described later.

The gas separated in this gas-liquid separation chamber 8 is released from the air vent 14, and the liquid from which the gas has been separated is released from the liquid path 15.
flows to This liquid path 15 communicates with the strainer chamber 2 on the inflow side. In the gas-liquid separation chamber 8, there is an air vent 1.
A gas outflow control valve 7 is provided to control the outflow of gas from the liquid H@15 to the atmosphere, and a gas outflow control valve 7 is provided to control the outflow of gas from the liquid H@15 to the atmosphere.
A liquid outflow control valve 10 is provided to control the liquid flowing into the tank.

Therefore, when the pump 3 is rotated by a suitable prime mover, the liquid flows from the inlet I 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 0 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 released from the air vent 14, and the liquid flows through the liquid path 1.
5 and is returned to the strainer chamber 2 on the inflow side.

At that time, the gas-liquid separation chamber 8 is provided with a gas outflow control valve 7, and even if the gas-liquid separation chamber 8 becomes full of liquid due to an unexpected situation, the gas outflow control valve 7 is closed and the liquid is released from the air vent. The liquid outflow control valve 1o is configured to allow liquid to flow into the liquid path 15 when a certain amount of liquid accumulates in the gas-liquid separation chamber 8.

As can be seen from FIG. 3, this gas-liquid separation chamber 8 is closed with a lid 16. The lid body 16 is detachably attached to the casing C with an appropriate number of bolts B.

The lid 16 is provided with a passage 14a that communicates with the air vent 14, and this passage 814a terminates inside the lid 16 at a downwardly directed opening 14b. In order to open and close this frontage 14b, a gas outflow control valve, generally designated by reference numeral 7, is used, in the illustrated example a float valve. This float valve 7 includes a float 21 that is attached to a lid 16 and is movable up and down along a guide rod 2o extending upward in the drawing, and a valve body 22 is attached to the upper end of the float 21. , the valve body 22 closes the opening 1 when the float 21 moves upward.
4b is closed.

The float 21 is made of a closed foam made of oil-resistant synthetic resin so as not to lose its buoyancy even if it is damaged, and the valve body 22 is made of an oil-resistant elastic material, such as rubber, and is formed into an inverted conical shape. It is designed to be closed from its outer periphery.

Next, a liquid outflow control valve 10, generally designated by the reference numeral 10, has a lid body 1.
A float rod 25 is pivotally connected to a placket 23 integrally formed with the float rod 6 with 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 pin 28 closer to the float 26 than the pivot pin 24 . The valve body 27 is adapted to open and close the opening 15a of the liquid path 15. This float 26 is made of oil-resistant synthetic T! 1lt
The float rod 25 is made of oil-resistant plastic that is light and easy to mold.

A gasket P is interposed at the joint surface between the lid body 16 and the casing C. Note that 30 in the figure is a drive shaft of the pump 3.

Therefore, when a liquid containing gas flows into the gas-liquid separation chamber 8 from the liquid path 13 in FIG. 2, the gas and liquid are separated in the gas-liquid separation chamber 8. Then, the gas flows through the upper opening 14b.
and is released into the atmosphere from the air vent 14. 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 through the opening 15a.
The liquid flows out into the liquid path 15 from there.

For example, if the liquid outflow control valve 10 fails and the opening 15a remains closed, the gas-liquid separation chamber 8 will be filled with liquid, which will flow out from the air vent 14.

To prevent this from happening, when the gas-liquid separation chamber 8 is filled with liquid, the float 21 moves upward to close the opening 14b and prevent the liquid from blowing out.

[Problems to be Solved by the Invention] Since the float 21 of the above float valve 7 is formed of a closed foam of oil-resistant synthetic resin, the resin swells and the specific gravity changes due to long-term use. There is a problem where the valve close position changes. In addition, foaming takes time, and the material is solid and requires a large amount of material, resulting in high costs.

On the other hand, a hollow float made of oil-resistant synthetic resin and having an air groove inside is known, but the liquid outflow control valve 10
After the opening 15a remains closed due to failure of the gas-liquid separation chamber 8 and the gas outflow control valve 7 is closed, there is no outlet for fluid from the gas-liquid separation chamber 8, only inflow from the liquid path 13, and the 8 is the set pressure of the bypass valve 12, for example 3 kg/
-, which causes the hollow float to burst. Furthermore, even if there is no failure, the internal pressure inside the hollow float changes due to yearly temperature changes, and after long-term use, the repeated internal pressure load acts on the float, causing cracks to occur. Furthermore, manufacturing costs are high.

Thus, closed foam bodies and hollow floats have low reliability and are expensive.

An object of the present invention is to provide a highly reliable and inexpensive float valve.

[Means for Solving the Problems] In the float valve according to the present invention, the float is formed in a hollow body with an open bottom surface.

It is preferable that the float is made of oil-resistant synthetic resin and provided with a cylindrical portion on the center line into which the guide rod is inserted, and that the valve body is made of oil-resistant rubber.

[Operation] In the float valve configured as described above, air is trapped in the float due to the rise in the liquid level, and the float moves upward due to the buoyancy of the air, closing the opening of the air vent with the valve body, and causing the liquid to rise. Prevent speech bubbles. When the liquid level drops, it moves downward and opens the opening, releasing the air inside the float. Therefore, the change in internal pressure is so small that it can be ignored.
Repeated loads due to internal pressure will not act on the float after long-term use.

[Example] The present invention will be described in detail below with reference to FIG. In addition,
Portions in FIG. 1 that correspond to those in FIG. 3 are given the same reference numerals and redundant explanation will be omitted.

In FIG. 1, the float valve, generally designated by the reference numeral 40, is
It consists of a float 41 and a valve body 44. The float 41 is made of oil-resistant synthetic resin and is formed into a hollow body with an open bottom, that is, an inverted top shape, and a guide rod 20 is placed on the center line.
A cylindrical portion 42 into which the cylindrical member is loosely inserted is formed. The valve body 44 is made of oil-resistant rubber and has an inverted conical shape.
The mounting portion 45 is fitted onto the top protrusion 43 of the float 41 .

Therefore, when the liquid level rises, air is trapped inside, and the buoyancy of the air causes the float 41 to move toward the guide rod 20.
, the valve body 44 closes the air vent opening 14b, and when the liquid level moves down, the float 41 moves down and closes the air vent opening 14b.
4b is opened to release air.

[Effects of the Invention] Since the present invention is configured as described above, even if the pressure inside the gas-liquid separation chamber becomes high, it will not be damaged unlike a hollow float. In addition, the change in internal pressure when the float moves up and down is negligibly small, and unlike hollow floats, the internal pressure of the float does not change due to temperature changes, so even if used for a long period of time, repeated loads due to internal pressure will not act. As a result, there is no damage to the float, no change in specific gravity, and reliability can be improved.

Further, since the float is simply formed into an inverted tip shape, it is easy to mold, requires only a small amount of material, and can be provided at low cost.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a schematic diagram of a pump device incorporating a gas-liquid separation chamber in which the present invention is implemented, and FIG. 3 is a diagram of the gas-liquid separation chamber. FIG. 8... Gas-liquid separation chamber 14... Air vent 40...
・Float valve 41... Float 44... Valve body diagram + 4a diagram

Claims (1)

[Claims] A float valve characterized in that the float is formed into a hollow body with an open bottom surface.