JPS6317906Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] Connected to a liquid transport pipe or closed space for storage to discharge and remove mixed gas in the transport liquid, or to prevent damage to the transport pipe on the downstream side. In such cases, it is necessary to introduce outside air into the pipe to prevent new pipe damage from occurring. The present invention is used in this case, and a valve seat made of an elastic material and having a small gas vent hole communicating with the outside air is provided in the upper part of the valve chamber that communicates with a closed space for transporting or storing liquid. The present invention also relates to an intake/exhaust valve in which a float, which maintains a gap between the inner wall of the valve chamber and the inner wall of the valve chamber, can be brought into contact with and separated from a small hole in the valve seat to open and close the float according to changes in the liquid level within the valve chamber.

[Conventional technology]

As the conventional technology for this type of intake and exhaust valve,
Air vent valves described in Japanese Utility Model Publication No. 14220 and Japanese Utility Model Publication No. 48-29221 are known. In these conventional techniques, the valve seat is formed into a conical shape, and the valve seat is pressed from above against a mounting seat which is also conical in shape and expands upward, compressed and fixed, thereby sealing the periphery of the valve seat.

[Problem that the invention attempts to solve]

As mentioned earlier, the intake and exhaust valve opens the small gas vent hole to discharge and remove the mixed gas when the mixed gas in the transported liquid accumulates in the valve chamber and the liquid level drops. be. At this time, the conditions for the float to fall from the gas vent hole and open this hole are not only that the liquid level drops, but also that the difference between the gas pressure inside the valve chamber and the outside pressure is ΔP, and that the float is Assuming that the inlet diameter of the adjacent gas vent hole is d, the condition of float weight > π/4d ² ΔP must be satisfied. In other words, although it is advantageous to have a larger hole diameter d in consideration of exhaust capacity and foreign matter clogging, the hole diameter d must be made smaller in order to prevent the float from falling as long as the weight of the float does not change.

In this way, the size of the gas vent hole is important in this type of intake and exhaust valve, but the conventional technology, which does not pay much attention to this point, has the following problems. The inventor discovered this. One of these is that in the conventional technology, in which a conical elastic valve seat was pressed against the mounting seat with strong force in order to ensure a sealing effect, the pressure from the periphery caused the small gas vent hole to close before installation. The hole diameter after installation was deformed to be smaller than the diameter, and the expected performance was not obtained, and the hole diameter varied depending on the degree of pressing force. On the other hand, as a result of repeated research and consideration, the present inventor came to the conclusion that the contradictory requirements of exhaust capacity and float drop performance could be met by utilizing the deformation action of an elastic body. As mentioned above, in the technology, the valve seat was pressed and fixed to the mounting seat with strong force, so a large internal force was already generated on the mounted valve seat, and this internal force reduced its elasticity, making the structure difficult to deform. I was used to it. In other words, with conventional intake/exhaust valves, it is difficult to obtain the expected intake/exhaust performance, and the small diameter of the gas vent hole is too small, making it easy for foreign matter to get clogged, and conversely, if the hole diameter is large, the float may not fall out. It was hot.

[Means for solving problems]

In the present invention, the valve seat made of an elastic body is made of an elastic body that can be deformed by the pressure inside the valve chamber, and the valve seat is made into a flange shape with a flange at the upper end of the cylindrical part, and the valve seat is fixed. The mounting hole for the valve seat is a stepped hole consisting of a large diameter hole on the upper side and a small diameter hole on the lower side that is larger in diameter than the cylindrical part of the valve seat and smaller in diameter than the flange. The valve seat is fixed by press-fixing the flange portion with a stopper.The functions and effects thereof are as follows.

[Effect]

The flange of the valve seat made of an elastic material is press-fixed to the step of the stepped hole to perform a sealing action at the valve seat. When the sealed valve seat and the float are in contact and the small gas vent hole is closed, the pressure difference between the outside pressure and the pressure in the valve chamber is acting on the cylindrical portion of the valve seat. If the pressure inside the valve chamber is high, this differential pressure causes the diameter of the inlet of the cylindrical portion, which is normally not subjected to stress, to be reduced against the elastic restoring force. When the gas vent hole opens, the pressure caused by the differential pressure is released and the cylindrical portion regains its original shape.

[Effect of idea]

Therefore, according to the technical means of the present invention, the magnitude of the pressure contact force when sealing around the valve seat will not have a negative effect on the hole diameter of the gas vent hole, making it possible to avoid paying too much attention during assembly work. The desired performance can be reliably achieved with the planned hole diameter. Moreover, as explained in the above operation, the diameter of the small gas vent hole is automatically adjusted when the valve is closed and when the valve is open, so it does not cause clogging of foreign matter and has excellent exhaust performance. When the liquid level in the valve chamber drops, the float can be quickly dropped to open the gas vent hole without being affected by the gas pressure in the valve chamber.

In short, the diameter of the cylindrical portion of the valve seat decreases in response to the pressure difference, so a high-performance intake and exhaust valve that operates in response to changes in pressure difference is obtained, and when the valve opens, it is ensured by the planned hole diameter. This has the excellent effect of providing excellent intake and exhaust performance.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figure 1 shows a system that connects a liquid transport pipe 1 or a closed space for storage to discharge and remove mixed gas in the transport liquid, and also connects a new pipe when the transport pipe 1 is damaged on the downstream side. It shows an intake/exhaust valve for introducing outside air into the pipe to prevent damage from occurring. This is a flange 2 connected to the transport pipe 1.
In the valve chamber A of the inner wall 3 as a container body equipped with,
A bottomed cylindrical guide 4 is provided with its opening side engaged with the upper opening edge of the container body 3, and a valve body 5 and a float 6 are provided in the guide 4 so as to be able to move up and down. A lid 8 with a large diameter intake/exhaust hole 7 is attached to the upper part, and the gas in the transport pipe 1 is distributed between the guide 4 and the inner peripheral surface of the main body and near the opening side of the guide 4 at intervals in the circumferential direction. Drilled intake and exhaust holes 9
... and through the large-diameter intake/exhaust hole 7. On the other hand, as the liquid is being discharged, the liquid level rises due to the inflow of liquid from the small hole 10 drilled at the bottom of the guide 4, and the float 6 is floated. The valve body 5 is raised to close the large diameter intake/exhaust hole 7 with the valve body 5, and in this state, gas such as bubbles is discharged through the small diameter gas vent hole 11 formed in the valve body 5. It has been done.

A valve seat 14 is provided at the center of the valve body 5, which is made of an elastic material and has the small gas vent hole 11, which communicates with the outside air, inserted therethrough. The valve seat 14 has a flange shape with a flange 14b at the upper end of the cylindrical portion 14a, and has a stepped hole 13 formed in the center of the valve body 5, that is, a large upper portion having a threaded portion 12. The flange portion 14 has a diameter larger than that of the diameter hole 13b and the cylindrical portion 14a.
It is fitted into a stepped hole 13 composed of a lower diameter hole 13a smaller in diameter than b. Reference numeral 15 in FIG. 2 is a metal fitting with a T-shaped cross section that is vulcanized and bonded to the valve seat 14. When fixing the valve seat 14 to the valve body 5 in a sealed state, The flange 14b of the seat 14 is engaged with the step 16 of the stepped hole 13, the stopper 17 is screwed onto the threaded part 12, and the valve seat 1
4. Fix the metal fitting 15 and the screw member 17 to the valve body 5 in a state where the hole portions formed in each are connected to each other.

The valve seat 14 is configured such that the outer diameter becomes smaller toward the float 6, and when the gas vent hole 11 is closed by the float 6, liquid pressure acts on the outer circumference of the valve seat 14. Accordingly, from the state shown in Fig. 2B, the gas vent hole 1 is changed from the state shown in Fig. 2B to
The aperture of the inlet side portion of No. 1 is configured to be reduced in diameter against elastic restoring force.

In addition, when setting the outer peripheral diameter D of the protruding end side of the valve seat 14 and the inlet diameter d of the small gas vent hole 11, it is necessary to set each of them so as to cause a predetermined elastic deformation for diameter reduction, and to make the elastic deformation more than necessary. In order to prevent this from deteriorating the sealing performance in the closed state, it is preferable that the outer circumferential diameter D is 1.5 to 3 times the inlet diameter d.

[Another example]

In constructing the valve seat 14, the cylindrical portion 14a may be made into a cylindrical body having the same diameter in the longitudinal direction, or the third
As shown in the figure, the metal fitting 15 is vulcanized and bonded to the small-walled flange 14b integrally extending from the cylindrical part 14a, or as shown in FIG.
may be formed into a donut plate shape, and a small-thickness flange portion 14b integrally extended in the radial direction from the cylindrical portion 14a may be vulcanized and bonded to the metal fitting 15. Furthermore, as shown in FIG. 5, a flange 14c having approximately the same wall thickness as that of the cylindrical portion 14a is extended in the radial direction, and the flange 14c is engaged with the stepped portion 16 and bonded to the metal fitting 15. The shapes of the valve seat 14 and the fitting 15, as well as the mounting structure to the valve element 5, are fixed by pressing the valve seat 14 to the valve body 5 via the fitting 15 when the stopper 17 is tightened. Various modifications are possible.

[Brief explanation of drawings]

The drawings show an embodiment of the intake and exhaust valve according to the present invention,
FIG. 1 is a longitudinal cross-sectional view of the entire body, and FIG. 2 is an enlarged view of the main parts, in which A shows the diameter-reduced state and B shows the non-diameter-reduced state. FIGS. 3 to 5 are sectional views of main parts showing other embodiments, respectively. 3...Inner wall, 6...Float, 11...Gas vent small hole, 13...Stepped hole, 13a...Small diameter hole,
13b...Large diameter hole, 14...Valve seat, 14a...Cylinder part, 14b...Flame part, 17...Stopper, A...Valve chamber.

Claims (1)

[Scope of Claim for Utility Model Registration] A valve seat 14 in which a small gas vent hole 11 made of an elastic material and communicating with the outside air is provided in the upper part of a valve chamber A that communicates with a closed space for transporting or storing liquid.
In addition, a float 6 with a gap maintained between it and the inner wall 3 of the valve chamber A can be brought into contact with and separated from the small hole 11 of the valve seat 14 to open and close it by fluctuations in the liquid level within the valve chamber A. In the intake/exhaust valve provided as shown in FIG.
It has a flange shape with a flange part 14b at the upper end of the valve seat 14, and an attachment hole for fixing the valve seat 14 is formed between the large diameter hole 13b on the upper side and the cylindrical part 1 of the valve seat 14.
4a and a lower diameter hole 13a that is smaller than the flange 14b.
An intake/exhaust valve characterized in that the valve seat 14 is fixed by being pressed and fixed with a stopper 17. The intake/exhaust system according to claim 1, wherein the outer circumferential diameter of the cylindrical portion 14a of the valve seat 14 is set to 1.5 to 3 times the entrance diameter of the small gas vent hole 11. valve.