JP2934560B2 - Automatic air vent valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIG. 4 is a longitudinal sectional view showing a state in which an automatic air vent valve according to the prior art employed in a CIP device is in a communicating state. The configuration and operation will be described with reference to FIG. A valve body 10 communicating the inside and outside of the pressure vessel is attached to the upper lid 1 of the CIP device by screws or the like as shown in FIG. 4, and a valve chamber 9 is formed inside the valve body, and a valve chamber is formed in the valve chamber. An exhaust port 11 composed of fine holes is provided. Valve stem 3
Is mounted in the valve chamber 9 so as to be slidable in the axial direction via a spring 8. Along with the injection of the liquid pressure medium into the pressure vessel, the air is discharged from the air holes 2 through the fine holes 4 and from the exhaust port 11 as indicated by arrows due to the density difference with the liquid pressure medium. When the liquid pressure medium flows into the valve chamber 9 through the fine holes 4, the pressure on the upper surface of the valve rod 3 decreases from the inlet of the fine holes 4 due to energy loss when passing through the fine holes 4. A differential pressure occurs above and below 3. Due to this differential pressure, the spring 8
And the valve stem 3 is slid toward the exhaust port side to open and close the valve between the sealing surface 6 of the valve stem 3 and the sealing surface 7 of the valve body 10.

[0003]

However, the automatic air bleeding valve according to the prior art has the following problems. That is, in order to operate the valve stem 3, the pores 4 are necessary. When the air is discharged by the pores, the pores 4 are clogged, and a malfunction such as air remaining in the pressure vessel occurs. It was easy. In addition, the pressure reduction in the pressure vessel depends on the discharge of the liquid pressure medium through the thin tube, but since the diameter of the pipe is small, the resistance to the flow is large. It took a considerable amount of time.

An object of the present invention is to solve the above-mentioned problems and to provide an automatic air bleeding valve in a liquid pressure vessel or the like that reliably and quickly bleeds air from the inside of the vessel without malfunction.

[0005]

According to a first aspect of the present invention, there is provided an automatic air bleeding valve provided in a lid of a container to which liquid is supplied, for bleeding air from the inside of the container. A valve retainer 15 provided so as to be able to be provided, a conical float chamber 20 formed inside the valve retainer, a float 14 disposed in the float chamber and forming an orifice, and supported by an upper portion of the valve retainer. And a spherical valve 16. The automatic air release valve according to the second invention is an air release valve provided on a lid of a container to which liquid is supplied and for extracting air from the inside of the container, wherein a valve presser 15 slidably provided in an 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 restrictor having a fluid passage fitted into a hole above the valve retainer. And a spherical valve 16 whose head is exposed from the part.

[0006]

According to the first aspect of the present invention, since the above-described structure is employed, the following operation is performed. When air exists in the pressure vessel, the air in the vessel enters the float chamber 20 through the filter 19 through the air hole 2 and is discharged from the exhaust port 11 together with the injection of the liquid pressure medium into the vessel. You. During the discharge of air, 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 and the like does not occur. When the discharge of the air is completed and the liquid pressure medium flows into the float chamber 20, the float 14 rises due to buoyancy and comes into contact with the surface of the float 14 and the valve retainer 15. Only the fine grooves 21 (see FIG. 3) cut in the contact surface are provided. For this reason, due to the flow of the liquid pressure medium, the pressure decreases at the outlet side of the fine groove due to energy loss, and a pressure difference is generated between the inlet side and the lower side. The valve presser 15, which has been pressed in the direction opposite to the valve seat 17 by the force of the spring 8, works together with the float 14 on the valve seat 17.
When the spherical valve 16 is pushed up in the direction and tightly seals the valve seat 17, 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 in a sealed state, the flow of the liquid pressure medium is also stopped, so that no differential pressure is generated due to the energy loss of the fine groove 21 of the float 14.
5 is pushed down by the force of the spring 8, and the float 14 remains in close contact with the valve retainer 15. The spherical valve 16 is kept pressed against the valve seat 17 by the pressure difference between the liquid pressure medium and the atmospheric pressure even if the pressing by the valve presser 15 is stopped, and does not come off by its own weight. When the pressure in the pressure vessel is reduced 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, and the valve 16 falls by its own weight,
When the air flows in from the exhaust port 11 side and enters the lower surface of the float 14, the float 14 drops, and the inside of the pressure vessel is completely opened to the atmosphere.

In the second aspect of the invention, the above-described structure operates as follows. Liquid pressure container 22 (see FIG. 5A)
With the injection of the liquid pressure medium into the air, the air enters the float chamber 20 through the filter 19 through the air hole 2 and is discharged through the exhaust port 11. The discharge of air from inside the pressure vessel 22 proceeds,
When the liquid pressure medium flows into the float chamber 20, the float 1
4 comes into contact with the raised valve retainer 15, and an upward force acts on the lower surfaces of the valve retainer 15 and the float 14. For this reason, the valve presser 15 is pushed up in the direction of the valve seat 17 together with the float 14, and the spherical valve 16 seals the valve seat 17 and the hydraulic pressure in the container increases.

When the pressure in the pressure vessel 22 is reduced by the discharge of the liquid pressure medium and the pressure in the vessel decreases to near atmospheric pressure, the differential pressure acting on the spherical valve 16 decreases. Then valve retainer 1
Numeral 5 is lowered by the force of the spring 8 with the spherical valve 16 and automatically discharges a small amount of the liquid pressure medium to reduce the pressure inside the pressure vessel 22 to the atmospheric pressure. When the internal pressure of the pressure vessel 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 outside air flows in from the exhaust port 11 to completely open the inside of the pressure vessel 22 to the atmosphere.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the automatic air venting valve according to the first invention is mounted on the upper lid of a pressure vessel in a CIP device,
A description will be given with reference to FIG. 1 showing a vertical cross section when the automatic air vent valve is in a communicating state, FIG. 2 showing a vertical cross section when it 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 chamber 9 is formed by a valve seat 17 and a valve seat retainer 13 which are coaxial with the air through hole 2. A valve presser 15 is accommodated in the valve chamber 9 in a state where it can slide in the axial direction via a spring 8, and a filter 19 is provided at an inlet from the pressure vessel to the valve chamber 9. I have. A float chamber 20 is formed below the valve retainer 15 in the form of a funnel-shaped space, and the 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 for the spherical valve 16. The above-mentioned float chamber 20
Inside has a surface shape associated with the inclined surface inside the float chamber, and a fine groove 2 as shown in FIG.
A frusto-conical float 14 with 1 is provided.

Next, the operation of the first embodiment will be described. FIG. 1 shows a state in which air is present in the pressure vessel. With the injection of the liquid pressure medium into the vessel, the air in the vessel enters the float chamber 20 through the filter 19 through the air hole 2 as indicated 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 flow easily. Absent. When the discharge of the air is completed and the liquid pressure medium flows into the float chamber 20, the float 14 is lifted by buoyancy according to the liquid level, and the side surface of the float 14 is inside the inner surface of the valve retainer 15. Be in touch.

FIG. 3 shows that the side surface of the float 14 is
FIG. 3 is an enlarged explanatory view of a state in which the inner surface of the float is inscribed. In such a state, the passage of the liquid pressure medium becomes only the fine groove 21 cut in the contact surface of the float 14 so as to have an orifice mechanism. Become. As a result, a pressure difference is generated between the inlet side and the outlet side of the groove 21 due to the energy loss caused by the flow of the liquid pressure medium, and pressure acts on the lower surface of the valve retainer 15 and the lower surface of the float 14. The valve presser 15 that has been pressed in the 17 directions (downward in the figure)
4 is pushed up in the direction of the valve seat 17 (upward in the figure), and when the spherical valve 16 is in contact with the valve seat 17 and sealed, the pressure of the liquid pressure medium acts on the lower surface of the valve 16 and is completely sealed. .

FIG. 2 shows a closed state. Spherical valve 1
When the valve seat 17 is sealed at 6, the flow of the liquid pressure medium stops, and no pressure difference occurs due to the energy loss of the fine groove 21 of the float 14. The float 14 is pushed down in the direction (downward in the figure), and the float 14 remains in close contact with the valve retainer 15. Spherical valve 1
6 retains the state of being pressed against the valve seat 17 by the difference between the pressure of the liquid pressure medium and the atmospheric pressure even if the holding by the valve holding member 15 is lost, and does not come off by its own weight. When the pressure in the pressure vessel is reduced by the discharge of the liquid pressure medium and the pressure becomes close to the atmospheric pressure, the differential pressure acting on the spherical valve 16 disappears, so that the valve 16 drops by its own weight, and air flows in from the exhaust port 11 side. When the float 14 enters the lower surface of the float 14, the float 14 falls and the inside of the pressure vessel is completely opened to the atmosphere, and returns to the communication state before the pressure increase. The above operation will be described in more detail.
The contact surface between the valve 16 and the valve retainer 15 is almost in line with the structure.
However, since this contact surface does not require sealing,
The seating surface on the side 15 is not machined with high precision. Or
In the valve 16 and the valve presser 15 in the state of the car seat,
When the upper lid 1 is opened upward after the pressure, the inside of the container becomes a negative pressure.
At this time, the valve 16 falls due to its own weight, and air is exhausted from the exhaust port 1.
After flowing in from the 1 side, the valve 16 falls and falls on the valve retainer 15.
The valve presser 15 is pierced by being supported by the
Hole that is in communication with the float chamber 20
However, as described above, the contact surface between the valve 16 and the
The air flow through the relevant surface is easy.
The air passes through the gap between the contact surfaces and the float chamber 2
0 and pushes down the float 14. This allows
The inside of the pressure vessel is completely open to the atmosphere.

Further, the valve seat cover 12 is fixed to the upper cover 1 with screws or the like.
The components such as the float 14 and the valve retainer 15 can be easily replaced, inspected, and adjusted by removing the valve chamber lid 12. Seals 5 are provided on the outer peripheral surfaces of the valve seat retainer 13 and the valve retainer 15, respectively, to prevent air or liquid pressure medium from leaking.

Next, the automatic air bleed valve according to the second aspect of the present invention
FIG. 5B shows a vertical cross section when the automatic air vent valve is in a communicating state, FIG. 6 shows a vertical cross section when it is in a closed state, and FIG. FIG. 3 is an enlarged view of the float portion in FIG.
This will be described with reference to FIG. As shown in FIG. 5B, an air communication hole 2 communicating from the upper surface to the lower surface of the upper lid 1 is provided, and a valve chamber 9 is formed by a valve seat 17 and a valve seat retainer 13 which are coaxial with the air communication hole. A spherical valve 16 is slidable in the axial direction (downward in the figure) via a spring 8 inside the valve chamber 9, and a part of the head is exposed and fitted in an upper part thereof. Valve retainer 15 having a flow path for a fluid serving as a portion and having a throttle formed on an upper portion thereof
Is stored. A filter 8 is provided at the inlet from the pressure vessel 22 to the valve chamber 9. The valve retainer 15
Is located below the float chamber 20 in a space with a funnel-shaped shape.
Is formed on the upper valve seat 17 side, and a concave portion having an upper portion provided with a throttle is provided with a valve holder 15 and a spherical valve 16 for opening and closing a fluid discharge hole formed in the valve seat 17. ing. The inside of the float chamber 20 has a surface shape compatible with the inclined surface inside the float chamber, and has a contact surface shown in FIG.
A frusto-conical float 14 having fine grooves 21 as shown in FIG.

Next, the operation of the second embodiment will be described. FIG. 5B shows a state where air is present in the pressure vessel 22 and the liquid pressure medium is injected into the pressure vessel 22, and the air flows from the air passage 2 to the filter 19 through the filter 19 as indicated by the arrow. And is discharged from the exhaust port 11. When the air in the pressure vessel 22 is discharged and the liquid pressure medium flows into the float chamber 20, the float 14 rises by buoyancy according to the liquid level and comes into close contact with the inner surface of the valve presser 15.

FIG. 3 is an enlarged explanatory view showing a state where the float 14 is in close contact with the inner surface of the valve presser 15. In such a state, a pressure difference occurs before and after the orifice due to the orifice mechanism formed by the fine grooves 21 cut on the contact surface of the float 14, and the force of the spring 8 causes the direction of the counter-valve seat 17 (downward in the figure).
The valve retainer 15 and the spherical valve 16, which have been pressed against the valve seat, are pushed up together with the float 14 in the valve seat direction (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 is reduced. 16 acts on the lower surface and is completely sealed.

FIG. 6 shows a closed state. The valve 16 is kept pressed against the valve seat 17 by the pressure difference between the liquid pressure medium and the atmosphere. With the use of the liquid medium pressure vessel 22 becomes close to the atmospheric pressure that is reduced, since the differential pressure acting on the valve 16 decreases, the valve 16 and Ben'osae 15
Drops simultaneously by the force of the spring 8, and the inside of the container is reduced to atmospheric pressure with a small amount of drainage. Here, the valve 16 and the valve presser 1
The bearing surface of No. 5 has rough surface accuracy as shown in the first embodiment.
Air is allowed to flow, so that the air
And flows into the float chamber. And the air flows
When the float 14 enters the lower surface of the plate 14 , the float 14 falls to the upper surface of the filter 19 by its own weight, and the inside of the pressure vessel returns to a state of communication with the atmospheric pressure before the pressure increase.

The valve chamber lid 12 has a structure to be fixed to the upper lid 1 by screws or the like. Parts replacement, inspection, adjustment and the like of the float 14, the valve retainer 15 and the like can be easily performed by removing the valve chamber lid 12. it can. Seals 5 are provided on the outer peripheral surfaces of the valve seat retainer 13 and the valve retainer 15, respectively, 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. The valve 16 is driven to close the valve hole, and a sufficient flow passage area for the air is ensured, so that reliable and quick automatic air bleeding without erroneous operation such as residual air becomes possible. In the second invention, in addition to the effects of the first invention, the liquid pressure container can be automatically and rapidly depressurized by interlocking the valve holder 15 and the spherical valve 16.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a communication state of an automatic air vent valve according to a first embodiment of the first invention.

FIG. 2 is a longitudinal sectional view of a closed state in FIG.

FIG. 3 is an enlarged explanatory view of a float unit in FIG. 2;

FIG. 4 is a longitudinal sectional view of a conventional automatic air vent valve in a communicating state.

FIG. 5 is a schematic longitudinal sectional view of a liquid pressure vessel utilizing the present invention, and a longitudinal sectional view of a communicating state of an automatic air vent valve according to a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a closed state in FIG. 5;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Top cover, 2 ... Air hole, 8 ... Spring, 9 ... Valve room, 11 ...
Exhaust port, 12: Valve chamber cover, 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)

(57) [Claims] An air release valve provided on a lid of a container to which liquid is supplied and for extracting air from the inside of the container, a valve presser (15) 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 on the upper part of the valve retainer. (16) An automatic air bleeding valve comprising: 2. An air release valve provided on a lid of a container to which a liquid is supplied and for extracting air from the inside of the container, a valve presser (15) 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 fluid flow fitted into a hole above the valve retainer. A spherical valve (16) having a passage and a head exposed from an upper throttle portion.