JPH05256372A - Automatic air vent valve - Google Patents

Abstract

PURPOSE:To provide an automatic air vent valve used in a liquid pressure vessel, etc., which is capable of letting air out of the vessel surely and rapidly without malfunctioning. CONSTITUTION:An automatic air vent valve, installed in a lid of a vessel supplied with liquid pressure medium, comprises a valve guard is disposed slidably in axial direction in a valve seat guard 13 through a spring 8, a comical float chamber 20 formed within the valve guard, a float 14 fitted in the float chamber, forming an orifice, and a spherical valve 16 supported with the valve guard. The spherical valve 16 is fitted in a hole in the upper portion of the valve guard 15. It is thus held with its head portion being exposed from the upper throttle portion having a fluid path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic air vent valve in a liquid pressure container or the like.

[0002]

2. Description of the Related Art FIG. 4 is a longitudinal sectional view of a conventional automatic air bleeding valve used in a CIP device in a communicating state. The configuration and operation will be described with reference to FIG. The valve body 10 communicating between the inside and the outside of the pressure vessel is attached to the upper lid 1 of the CIP device by a screw or the like as shown in FIG. 4, and the valve chamber 9 is formed inside the valve body, and the valve chamber is formed in the valve chamber. An exhaust port 11 made of fine holes is provided. Valve rod 3
Is mounted in the valve chamber 9 via the spring 8 so as to be slidable in the axial direction. Along with the injection of the liquid pressure medium into the pressure vessel, the air is discharged from the air outlet 2 through the fine holes 4 through the exhaust port 11 as indicated by the arrow due to the difference in density with the liquid pressure medium. When the liquid pressure medium comes into the valve chamber 9 through the fine hole 4, the pressure on the upper surface of the valve rod 3 becomes lower than that at the inlet of the fine hole 4 due to energy loss when passing through the fine hole 4. A differential pressure is generated above and below 3. This differential pressure causes the spring 8
Was compressed and the valve rod 3 was slid toward the exhaust port side, and the valve was opened and closed between the sealing surface 6 of the valve rod 3 and the sealing surface 7 of the valve body 10.

[0003]

However, the above-mentioned conventional automatic air vent valve has the following problems. That is, the fine hole 4 is required to operate the valve rod 3, and the fine hole 4 is clogged when air is discharged by the fine hole, causing malfunction such as air remaining in the pressure vessel. It was easy. The decompression in the pressure vessel depends on the discharge of the liquid pressure medium through the thin tube, but since the tube diameter is small, the resistance to flow is large, so it is necessary to completely open the pressure vessel to the atmosphere during decompression. It took a considerable amount of time.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and provide an automatic air bleeding valve in a liquid pressure container or the like that reliably and quickly withdraws air from the inside of the container without causing malfunction.

[0005]

The automatic air bleeding valve of the first invention is an air bleeding valve which is provided in a lid portion of a container to which a liquid is supplied and bleeds air from the inside of the container, and slides in an axial direction via a spring. A valve retainer 15 that is provided so as to be possible, a conical float chamber 20 that is formed inside the valve retainer, a float 14 that is disposed in the float chamber and that forms an orifice, and that is supported above the valve retainer. It is characterized by having a spherical valve 16. The automatic air bleeding valve of the second invention is an air bleeding valve which is provided in a lid portion of a container to which liquid is supplied and which bleeds air from the inside of the container. The valve retainer 15 is slidable in the axial direction via a spring. A conical float chamber 20 formed inside the valve retainer, a float 14 arranged in the float chamber to form an orifice, and an upper throttle having a fluid passage fitted in a hole in the upper portion of the valve retainer. It is characterized by having a spherical valve 16 whose head is exposed from the portion.

[0006]

In the first aspect of the invention, since it has the above-mentioned structure, it operates as follows. When air is present in the pressure container, the liquid pressure medium is injected into the container, and the air in the container enters the float chamber 20 from the air passage 2 through the filter 19 and is discharged from the exhaust port 11. It While the air is being discharged, the float 14 and the valve retainer 15 are in contact with the filter 19, and there is a sufficient gap between the surface of the float 14 and the inner surface of the valve retainer 15, so that clogging of foreign matters does not occur. When the liquid pressure medium has flown into the float chamber 20 after the air has been discharged, the float 14 floats up due to the buoyancy and the surfaces of the float 14 and the valve retainer 15 come into contact with each other, and the flow path of the liquid pressure medium is Only the fine grooves 21 (see FIG. 3) cut on the contact surface are formed. Therefore, due to the flow of the liquid pressure medium, there is a pressure drop due to energy loss on the outlet side of the fine groove, and a pressure difference is generated between the minute pressure side and the inlet side, and the upward pressure is applied to the lower surface of the valve retainer 15 and the lower surface of the float 14. The valve retainer 15 that has been pressed in the direction opposite to the valve seat 17 by the force of the spring 8 moves together with the float 14 into the valve seat 17
When the spherical valve 16 is pushed up in the direction and comes into close contact with the valve seat 17 and seals, the pressure of the liquid pressure medium acts on the lower surface of the valve 16 and the valve 16 is completely sealed.

When the spherical valve 16 is hermetically sealed, the flow of the liquid pressure medium also disappears, so that the differential pressure due to the energy loss in the fine groove 21 of the float 14 is eliminated.
5 is pushed down by the force of the spring 8, and the float 14 remains in close contact with the valve retainer 15. Even if the valve retainer 15 is no longer pressed, the spherical valve 16 retains the state of being pressed against the valve seat 17 due to the pressure difference between the liquid pressure medium and the atmospheric pressure, and does not come off due to its own weight. When the pressure vessel is decompressed by the discharge of the liquid pressure medium and becomes close to the atmospheric pressure, the differential pressure acting on the spherical valve 16 disappears, so the valve 16 falls by its own weight,
When the air flows in from the exhaust port 11 side and reaches the bottom surface of the float 14, the float 14 drops and the inside of the pressure vessel is completely opened to the atmosphere.

According to the second aspect of the invention, the above-described structure operates as follows. Liquid pressure container 22 (see FIG. 5 (a))
Along with the injection of the liquid pressure medium into the inside, the air enters the float chamber 20 through the air passage hole 2 and the filter 19 and is discharged from the exhaust port 11. The discharge of air from the pressure vessel 22 progresses,
When the liquid pressure medium flows into the float chamber 20, the float 1
4 floats up and comes into contact with the valve retainer 15, and an upward force acts on the lower faces of the valve retainer 15 and the float 14. Therefore, the valve retainer 15 is pushed up in the direction of the valve seat 17 together with the float 14, the spherical valve 16 seals the valve seat 17, and the liquid pressure in the container increases.

When the pressure vessel 22 is depressurized by the discharge of the liquid pressure medium and the pressure inside the vessel is lowered to near atmospheric pressure, the differential pressure acting on the spherical valve 16 becomes small. Then the valve retainer 1
5 moves down by the force of the spring 8 together with the spherical valve 16, automatically discharges a small amount of liquid pressure medium, and reduces the pressure in the pressure container 22 to atmospheric pressure. When the internal pressure of the pressure container 22 drops to the same level as the atmospheric pressure, the float 14 falls on the upper surface of the filter 19 by its own weight, and the outside air flows in from the exhaust port 11 to completely open the inside of the pressure container 22 to the atmosphere.

[0010]

[First Embodiment] A first embodiment in which the automatic air vent valve according to the first invention is mounted on the upper lid of a pressure vessel in a CIP device,
The description will be made with reference to FIG. 1 showing a vertical section when the automatic air bleeding valve is in a communication state, FIG. 2 showing a vertical section when the automatic air bleeding valve is in a closed state, and FIG. 3 showing an enlarged float portion in FIG. As shown in FIG. 1, an air passage 2 communicating from the upper surface to the lower surface of the upper lid 1 is provided, and a valve seat 17 and a valve seat retainer 13 which are coaxial with the air passage hole 2 form a valve chamber 9. A valve retainer 15 is housed inside the valve chamber 9 in a state of being slidable in the axial direction via a spring 8, and a filter 19 is provided at an inlet portion from the pressure container side to the valve chamber 9. There is. A float chamber 20 is formed below the valve retainer 15 in the shape of a hollow funnel, and an upper valve seat 17 side opens and closes an air discharge hole formed in the valve retainer 15 and the valve seat 17. It serves as a support portion for the spherical valve 16 that operates. The float chamber 20 described above
Has a surface shape associated with the inclined surface inside the float chamber, and the contact surface has fine grooves 2 as shown in FIG.
A frustoconical float 14 having a number 1 is disposed.

Next, the operation of the above-described first embodiment will be described. FIG. 1 shows a state in which air is present in the pressure vessel, and when the liquid pressure medium is injected into the vessel, the air in the vessel enters the float chamber 20 through the air passage hole 2 and the filter 19 as shown by the arrow. It is discharged from the exhaust port 11. During the air discharge, the float 14 is in contact with the filter 19 together with the valve retainer 15, and there is a sufficient gap between the side surface of the float 14 and the inner surface of the valve retainer 15, so that the air can easily flow therethrough, causing clogging. Absent. When the discharge of air is completed and the liquid pressure medium begins to flow into the float chamber 20, the float 14 floats up due to the buoyancy according to the height of the liquid surface, and the side surface of the float 14 comes inside the inner surface of the valve retainer 15. Come into contact.

In FIG. 3, the side surface of the float 14 is a valve retainer 15.
FIG. 6 is an enlarged explanatory view of a state when inscribed on the inner surface of the liquid. In such a state, the passage of the liquid pressure medium is only the fine groove 21 cut on the contact surface of the float 14 and has the orifice mechanism. Become. Therefore, a pressure difference is generated between the inlet side and the outlet side of the groove 21 due to energy loss caused by the flow of the liquid pressure medium, pressure is applied to the lower surface of the valve retainer 15 and the lower surface of the float 14, and the force of the spring 8 causes the anti-valve seat. The valve retainer 15 pressed in the 17 direction (downward in the figure) is the float 1
4 is pushed up in the direction of the valve seat 17 (upward in the figure), and when the spherical valve 16 contacts the valve seat 17 and is sealed, the pressure of the liquid pressure medium acts on the lower surface of the valve 16 and is completely sealed. ..

FIG. 2 shows the closed state. Spherical valve 1
When the valve seat 17 is sealed at 6, the flow of the liquid pressure medium is stopped, and the pressure difference due to the energy loss in the fine groove 21 of the float 14 is also eliminated. The float 14 is pushed down in the direction (downward in the drawing), and the float 14 remains in close contact with the valve retainer 15. Spherical valve 1
Even when the valve retainer 15 is no longer retained by the valve retainer 6, the retainer retains the state in which it is pressed against the valve seat 17 due to the difference between the pressure of the liquid pressure medium and the atmospheric pressure, and does not come off due to its own weight. When the pressure inside the pressure vessel is reduced to near atmospheric pressure by discharging the liquid pressure medium, the differential pressure acting on the spherical valve 16 disappears, so the valve 16 falls by its own weight, and air flows in from the exhaust port 11 side. The float 14 drops when it reaches the bottom surface of the float 14, the inside of the pressure vessel is completely opened to the atmosphere, and the communication state before the pressurization is restored.

Further, the valve seat lid 12 has an upper lid 1 such as a screw.
Since the valve chamber lid 12 is removed, the parts such as the float 14 and the valve retainer 15 can be easily replaced and inspected and adjusted. Seals 5 are respectively provided on the outer peripheral surfaces of the valve seat retainer 13 and the valve retainer 15 to prevent air or liquid pressure medium from leaking.

Next, the automatic air bleeding valve according to the second invention is CIP
FIG. 5 (b) showing a vertical section when the automatic air vent valve is in the communicating state, and FIG. 6 showing a vertical section in the closed state regarding the second embodiment mounted on the upper lid 1 of the pressure vessel 22 in the apparatus. FIG. 3 is an enlarged view of the float portion in FIG.
Will be described. As shown in FIG. 5B, the upper lid 1 is provided with an air passage 2 communicating from the upper surface to the lower surface, and a valve seat 17 and a valve seat retainer 13 coaxial with the air passage 2 form a valve chamber 9. Holding of a spherical valve 16 that is slidable in the valve chamber 9 in the axial direction (downward in the figure) via a spring 8 and has a head exposed at an upper part thereof. Valve retainer 15 having a flow path for a fluid serving as a part and having a throttle formed on the upper portion thereof
Is stored. A filter 8 is provided at the inlet of the valve chamber 9 from the pressure container 22 side. The valve retainer 15
Below the bottom is a float chamber 20 with a funnel-shaped space.
And a spherical valve 16 that opens and closes a valve discharge hole formed in the valve retainer 15 and the valve seat 17 is held in a recessed portion formed on the upper valve seat 17 side. ing. The inside of the float chamber 20 has a surface shape that matches the inclined surface inside the float chamber, and the contact surface has a shape as shown in FIG.
A frustoconical float 14 having fine grooves 21 as shown in FIG.

Next, the operation of the second embodiment will be described. In FIG. 5 (b), when the liquid pressure medium is injected into the pressure vessel 22 in a state where air is present in the pressure vessel 22, the air flows from the air passage 2 to the filter 19 as shown by the arrow, and flows into the float chamber 20. Enters into and is discharged from the exhaust port 11. When the air inside the pressure vessel 22 is discharged and the liquid pressure medium flows into the float chamber 20, the float 14 floats up due to the buoyancy according to the height of the liquid surface and comes into close contact with the inner surface of the valve retainer 15.

FIG. 3 is an enlarged explanatory view of the state where the float 14 is in close contact with the inner surface of the valve retainer 15. In such a state, a pressure difference is generated across the orifice due to the orifice mechanism formed by the fine groove 21 cut on the contact surface of the float 14, and the force of the spring 8 causes the valve seat 17 to move in the direction opposite to the valve seat 17 (downward in the figure).
The valve retainer 15 and the spherical valve 16 pressed against the valve 14 are pushed up in the valve seat direction (upward in the figure) together with the float 14, and when the spherical valve 16 contacts the valve seat 17 and is sealed, the pressure of the liquid pressure medium is increased. It will act on the underside of 16 and will be completely sealed.

FIG. 6 shows the closed state. The valve 16 keeps being pressed against the valve seat 17 by the pressure difference between the liquid pressure medium and the atmosphere. When the pressure container 22 is depressurized to near atmospheric pressure by using the liquid pressure medium, the differential pressure acting on the valve 16 decreases, so that the valve 16 and the valve retainer 15 are simultaneously dropped by the force of the spring 8 and a small amount. The inside of the container is depressurized to atmospheric pressure with the drainage of. When the air flows in from the exhaust port 11 side and reaches the bottom surface of the float 14, the float 1
4 falls on the upper surface of the filter 19 due to its own weight, and the inside of the pressure vessel returns to the state of communication with the atmospheric pressure before pressurization.

Further, the valve chamber cover 12 is structured to be fixed to the upper cover 1 with screws or the like, and replacement, inspection and adjustment of parts such as the float 14 and the valve retainer 15 can be easily performed by removing the valve chamber cover 12. it can. Seals 5 are respectively provided on the outer peripheral surfaces of the valve seat retainer 13 and the valve retainer 15 to prevent air or liquid pressure medium from leaking.

[0020]

According to the first aspect of the present invention, the orifice mechanism formed by the float 14 causes a pressure difference between the inlet side and the outlet side of the liquid pressure medium passing through the orifice, and the pressure difference causes the valve retainer 15 and the spherical valve. Since the valve hole is closed by driving 16 and a sufficient flow passage area for air is secured, reliable and quick automatic air bleeding without malfunction such as residual air becomes possible. In addition to the effects of the first invention, the second invention makes it possible to automatically and rapidly depressurize the liquid pressure container by interlocking the valve retainer 15 and the spherical valve 16.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a communication state of an automatic air bleeding valve according to a first embodiment of the first invention.

FIG. 2 is a vertical cross-sectional view in a closed state in FIG.

FIG. 3 is an enlarged explanatory view of a float portion in FIG.

FIG. 4 is a vertical cross-sectional view of a communication state of a conventional automatic air vent valve.

FIG. 5 is a schematic vertical cross-sectional view of a liquid pressure container utilizing the present invention and a vertical cross-sectional view of a communicating state of an automatic air bleeding valve according to a second embodiment of the second invention.

6 is a vertical cross-sectional view of FIG. 5 in a closed state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Upper lid, 2 ... Air passage hole, 8 ... Spring, 9 ... Valve chamber, 11 ...
Exhaust port, 12 ... Valve chamber lid, 13 ... Valve seat retainer, 14 ... Float, 15 ... Valve retainer, 16 ... Valve, 17 ... Valve seat, 19 ... Filter, 20 ... Float chamber, 21 ... Groove, 22 ... Pressure vessel ..

Claims (2)

[Claims] 1. A valve retainer (15), which is provided in a lid portion of a container to which a liquid is supplied and which extracts air from the inside of the container, is provided slidably in an axial direction via a spring (8). A conical float chamber (20) formed inside the valve retainer, a float (14) fitted into the float chamber to form an orifice, and a spherical valve supported above the valve retainer. (16) An automatic air vent valve comprising: 2. A valve retainer (15) provided axially slidably via a spring (8) in an air vent valve provided in a lid portion of a container to which liquid is supplied to extract air from the inside of the container. A conical float chamber (20) formed inside the valve retainer, a float (14) fitted into the float chamber to form an orifice, and a fluid flow port fitted into a hole in the upper portion of the valve retainer. An automatic air bleeding valve having a spherical valve (16) having a passage and a head exposed from the upper throttle portion.