JPH0231122Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in a gas-liquid separation device for separating air mixed in a liquid flowing in a flow path pipe from the liquid.

BACKGROUND ART When measuring a liquid using a flowmeter, if a gas is mixed into the liquid to be measured, no matter how accurate the flowmeter is, accurate measurement cannot be performed. In such cases, by using an air separator, the gas in the liquid can be removed, and after the gas has been removed, the liquid can be measured by passing it through a flowmeter to accurately measure the fluid. That's what I do.

FIG. 5 is a sectional view for explaining an example of a conventional gas-liquid separation device. In the figure, 1 has a liquid inlet 2 and an outlet 3 at the bottom, and an air reservoir 4 at the top. In the liquid separation tank, the liquid containing air bubbles that flows into the tank 1 from the inlet 2 is separated from the air bubbles in the tank 1 and then flows out through the outlet 3.
The gas separated in the tank 1 accumulates in the air reservoir 4, and the liquid level gradually decreases. A float 5 is floating on the liquid level, and a valve mechanism 6 is provided above the float 5. When the float lowers as described above and reaches a predetermined position, the valve mechanism 6 opens. , the air in the air reservoir 4 is discharged from the exhaust port 31.
released to the outside. When the air in the air reservoir 4 is released to the outside, the pressure in the air reservoir 4 decreases, the liquid level rises, the float rises, and the valve mechanism 6 closes.

FIG. 6 is a cross-sectional view taken along the line A-A in FIG.
An outer cylinder 20 is provided on the outside of the inner cylinder 10 and moves up and down in sliding contact with the inner cylinder 10, and an opening 11 is provided in the side wall of the inner cylinder 10. The outer cylinder 20 is connected to the float 5 via a pin 30, and while the air in the air reservoir 4 is low, the float 5 is in the state shown in the figure, and therefore the opening 11 of the inner cylinder 10 is connected to the outer cylinder 20. The air inside the air reservoir 4 is discharged to the outside in small amounts through the minute gap 32. After the air is completely exhausted, the liquid tries to be expelled, but since its viscosity is much higher than that of gas, the leakage is extremely small. However, when the air mixed in the liquid is separated from the liquid as described above and the amount of air in the air reservoir 4 increases, the air volume in the air reservoir increases and the liquid level decreases. Then, the float 5 lowers and finally the outer cylinder 2
0 falls below the opening 11 of the inner cylinder 10, the air reservoir 4 and the outside communicate through the opening 11, and the air in the air reservoir 4 is discharged to the outside.
When the air in the air reservoir 4 is released to the outside, the liquid level in the tank 1 rises again, causing the outer cylinder 20 to rise to the inner cylinder 10.
The opening 11 is closed, and the same operation is repeated.

Therefore, in the above-mentioned conventional gas-liquid separator,
Due to the pressure difference between the pressure inside the tank 1 and the pressure outside the tank 1, that is, the pressure in the inner cylinder 10, the outer cylinder 20 is attracted to the side surface of the inner cylinder 10 even when the communication port 11 is in a symmetrical position. For example, as shown in Fig. 6, the outer cylinder is eccentric and comes into contact with the inner cylinder, and due to frictional force, a large force is required to raise the outer cylinder. Therefore, a float with large buoyancy must be used. In addition, a large force is required when descending, which necessitates the use of a heavy float, which requires contradictory performance from the float. This leads to an increase in manufacturing costs due to the increase in size, and in the case of low specific gravity liquids such as LPG, buoyancy cannot be obtained, which poses a big problem.

Problems to be Solved The present invention was made in order to solve the above-mentioned drawbacks of the prior art, and in particular, it was made with the aim of making it possible to move the float up and down smoothly and with a low load. It is something that

Means for Solving the Problems Figure 1 is a cross-sectional view of essential parts for explaining one embodiment of the present invention, in which 5 is a float, 10 is an inner cylinder, 20 is an outer cylinder, and 30 is a connection. With pins, these are
It operates as described with respect to FIGS. 5 and 6. Therefore, in the present invention, a groove 21 is provided on the inner circumferential surface of the outer cylinder 20 so as to cover the opening 11, so that the pressure balance between the inner cylinder 10 and the outer cylinder 20 is completely maintained. It is maintained substantially uniform over the circumference, and the frictional force at the contact surface between the inner cylinder 10 and the outer cylinder 20 can be reduced without receiving differential pressure when the outer cylinder 20 is eccentric with respect to the inner cylinder 10. The float 5 can move up and down smoothly.

Embodiment FIG. 2 is a sectional view of the inner cylinder, FIG. 3 is a sectional view of the outer cylinder, and FIG. 4 is a cross-sectional view of the outer cylinder taken along line B-B in FIG.
In a side view seen from the line direction, the opening 11 is provided in the side of the inner cylinder 10, and the pin hole 12 is provided in the lower end. Further, the pressure balance groove 21 is provided above the outer cylinder 20, and the pin hole 22 for inserting the pin 30 is provided at the lower end.
A vertically long pin through hole 23 is provided in the side portion, into which the pin 12a passing through the pin hole 12 of the inner cylinder 10 is inserted. Therefore, the float 5 moves up and down with a stroke corresponding to the length L of the pin through hole 23, and during that time, the air reservoir 4 is moved as described above.
Release the air trapped inside to the outside.

Effects As is clear from the above explanation, according to the present invention, the frictional force between the inner cylinder and the outer cylinder is significantly reduced, so the outer cylinder, that is, the float, can move up and down smoothly, making it compact and highly accurate. A good gas-liquid separation device can be provided.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of main parts for explaining an embodiment of a valve mechanism used in a gas-liquid separation device according to the present invention, Fig. 2 is a sectional view showing an embodiment of an inner cylinder, and Fig. 3 is a cross-sectional view of the outer cylinder, and FIG. 4 is a cross-sectional view of the outer cylinder, and FIG.
FIG. 5 is a cross-sectional view for explaining an example of a conventional gas-liquid separation device, and FIG. 6 is a view as seen from the direction of line B.
6 is a cross-sectional view taken along the line A-A in FIG. 5. FIG. 1... Gas-liquid separation tank, 2... Liquid inlet, 3
...Liquid outlet, 4...Hole air reservoir, 5...Float, 6...Valve mechanism, 10...Inner cylinder, 11...Communication port, 20...Outer cylinder, 21...Pressure balance groove.

Claims (1)

[Scope of utility model registration request] A gas-liquid separation tank having a liquid inlet and an outlet at a lower part and an air reservoir section at an upper part for storing air separated from the liquid; It has a float that moves to follow the surface, and a valve mechanism that opens when the float descends by a predetermined amount, and the valve mechanism has an opening on the side and the inside communicates with outside pressure. It has an inner cylinder and an outer cylinder that moves up and down along the inner cylinder on the outside of the inner cylinder, and when the outer cylinder moves up and down following the float and the outer cylinder descends by a predetermined amount, the In the gas-liquid separator, the inside of the inner cylinder communicates with an air reservoir in the tank through the opening, and the air in the air reservoir is discharged to the outside through the opening. A gas-liquid separation device comprising a pressure balance groove covering an opening of the inner cylinder.