JPS5824674B2 - air valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve, that is, an air valve, which is installed in the middle of a fluid pipeline such as a water main and used for the purpose of removing air mixed in the pipeline. Accidents caused by air collision and resistance against the float valve during exhaust operation of the air valve, or abnormal floating of the float valve due to fluid collision, etc., when pouring fluid into the fluid pipe to make it full. Regarding air valves for preventing.

In addition to the above-mentioned purposes, the air valve has the following functions: to discharge air from the pipe when the pipe is filled with water, and to block the discharge of water; and to draw air into the pipe when draining the water from the pipe. installed in the pipeline for the purpose of

At that time, a general air valve, that is, JIS ~ B2063-1
The 977 water supply air valve has a structure with a spherical float valve built into the valve box, so during the exhaust operation of this type of air valve, gusts of air flow and pulsating air flow push the float valve to the surface. or ■ When air passes through the valve chamber formed by the valve box or float valve guide and passes through the gap formed by the float valve box or float valve guide, if the air passing through is fast, the float valve Due to the contact resistance with the air on the surface and the vortex formation resistance caused by the air flow, the float valve floats up and is pushed up.
In addition, (1) abnormal floating of the float valve occurs, such as when water collides with the float valve and is pushed up due to the injection of water when water is introduced into the valve box before the end of the exhaust operation.

Due to the abnormal floating of the float valve, the float valve may block the exhaust hole that communicates with the outside air at the top of the air valve, blocking the exhaust and causing a malfunction of the exhaust, or because the blocking operation is sudden. An instantaneous pressure rise (air hammer) occurs inside the valve box, which not only damages the internal parts of the valve box, but also causes damage to attached equipment due to this pressure rise.

Furthermore, due to a malfunction of the exhaust, the air in the pipe cannot be exhausted and the air occupies the cross section of the pipe, which wastes the time required to fill the pipe or makes it impossible for water to flow. This will cause a lot of trouble.

Below, we will discuss the behavior of the float valve in air flow in a little more detail.

FIG. 1 schematically shows the air flow of a spherical float valve built into a conventional air valve.

Air flow 4 impinging on the front part of this spherical float valve 1
The direction of the flow is changed significantly, causing flow separation as it flows along the surface of the spherical float valve 1, creating a vortex region (vortex region) 6 behind the spherical float valve 1.

In this vortex region 6, the pressure decreases, and the spherical float valve 1 receives a force (vortex formation resistance) in the direction of the air flow and floats.

The vortex region 6 of the spherical float valve 1 is large, which makes it easier to float.

FIG. 2 schematically shows the flow of air through an oval float valve 2 having a streamlined protrusion 7 formed in the front.

The air flow 4 impinging on the ellipsoidal float valve 2 has a small change in direction due to the effect of the streamlined protrusion 7, and flows smoothly along the surface of the float valve 2.

Therefore, although the flow separation does not disappear, the position of separation moves further to the rear of the float valve 2, and the vortex region 6 also becomes smaller.

Therefore, the vortex formation resistance of the ellipsoidal float valve 2 is smaller than that of the spherical float valve 1.

FIG. 3 schematically shows the air flow of the ellipsoidal perforated float valve 3 newly proposed in the present invention.

This float valve 3 has a streamlined protrusion 7 formed in the front to form an ellipsoidal shape as a whole, and the streamlined protrusion 7 is provided inside the float valve 3.
A ventilation hole 29 is formed to penetrate upward from the ventilation hole 29.
It has a structure in which the ejection port 9 of the outlet is opened at a surface position where separation of the air flow occurs.

The air flow 4 that comes to the front center of this ellipsoidal-shaped perforated float valve 3 flows directly into the vent hole 29 of the float valve 3, and the air flow 4 that leaves the center flows along the ellipsoid-shaped surface as described above. The flow is smoother than in the case of the ellipsoidal float valve 2.

The in-hole air flow 5 flowing in the vent hole 29 flows out from the jet port 9, but at this time, it merges with the vortex region of the air flowing along the surface of the float valve 3, so that separation of the flow does not occur.

Therefore, in this ellipsoidal-shaped float valve 3, there is no floating of the float valve due to the vortex-forming resistance.

However, the three float valves 1, 2, and 3 on the diagonal are all subjected to upward force due to the direct collision of the air flow 4 and resistance according to the cross-sectional area of the float valve, and the upward force As the force increases, the float valve easily floats up.

The technical object of the present invention is to obtain an air valve in which the float valve does not float at all due to the air flow, based on the knowledge regarding the characteristics of an inclined float valve with respect to air flow.

The air valve of the present invention adopts the following configuration (technical means) in order to achieve the above technical problem.

■ Consisting of a float valve and a float valve receiver that removably accommodates the float valve in a recess on its upper surface and is arranged in a valve box with an air supply passage having a required gap at the valve chamber entrance; ■The float valve forms a ventilation hole that penetrates from the bottom to the top, and the jet opening of the ventilation hole opens into the vortex region of air, and a stabilizer is disposed at the bottom inside the float valve, and ■the float Valve; characterized in that a through hole is formed in the center of the bottom of the receiver, penetrating vertically and communicating with the air hole of the float valve.

This air valve has the following effect on the air flow.

The air flow introduced from the valve chamber inlet is divided by the float valve receiver into the air flow into the air passage and the flow into the through hole.

The air flowing through the airway flows along the outer surface of the float valve receiver without directly impinging on the float valve, and a portion of it reaches the vortex region on the upper surface of the float valve.

The air that enters the through hole of the float valve receiver then flows through the float valve through the float valve vent and flows out of the spout, creating a vortex region of air flowing along the upper surface of the float valve. This prevents flow separation and the generation of eddy resistance.

The air valve of the present invention has the following unique effects.

■ The float valve is protected against the upward force caused by the collision of the floating blade and air due to vortex-forming resistance, and abnormal floating caused by air flow is prevented.

■ Specially modified float valve shape (e.g. ellipsoidal shape)
It is easy to process because it can be made into a spherical shape without any bending.

■ The float valve always maintains a constant posture using a stabilizer.
The function of this air valve can always be maintained in a normal state.

The air valve of the present invention adopts the following embodiments.

That is, a streamlined protrusion is formed on the lower surface of the float valve receiver facing the valve chamber inlet.

According to this aspect, the air flow introduced from the valve chamber inlet becomes smoother, reducing the vortex region of the air flow reaching the upper surface of the float valve, and enhancing the effect of preventing the float valve from floating.

Embodiments of the present invention will be described below based on the drawings.

4 and 5 show an embodiment of the pneumatic valve of the present invention.

A float valve receiver 12 is fixed with a holding portion 13 to the valve chamber inlet 19 side inside the valve box 16 of the air valve.

The float valve receiver 12 has a streamlined protrusion 7 formed on its valve chamber inlet 19 side, and a through hole 8 is formed in the protrusion T vertically upward.

Further, a recess 30 is formed on the upper surface of the float valve receiver 12, that is, on the side of the valve chamber 21, in which the float valve 14 can be accommodated.

The spherical float valve 14 has a vent hole 29 penetrating upward from the center of its lower part.

The vent hole 29 once extends directly above the vent hole port 10, branches in the middle, and opens its outlet jet port 9 at a surface position of the float valve 14 where air flow separation occurs.

Further, a stabilizer 15 made of a heavy material is provided on the inner lower side of the float valve 14, so that the float valve 14 is always in a fixed position, that is, the vent hole population 10 is always at the lower side, and the vent hole population 10 is always at the lower side. In other words, the float valve 14 has a function of not swinging so that the spherical axis passing through the spherical center and the spherical center of the float valve is always in a vertical position.

Then, the float valve 14 is connected to the four parts 3 of the float valve receiver 12.
0, the vent hole 29 of the float valve 14 and the through hole 8 of the float valve receiver 12 are in communication.

In order to facilitate this communication, the diameter of the vent hole 10 of the float valve 14 is expanded downward, and an insertion hole protruding into the recess 30 of the float valve receiver 12 is provided above the through hole 8 of the float valve receiver 12. A nozzle 11 is formed, the insertion nozzle 11
is inserted into the vent hole 10.

An air passage 20 is formed between the float valve receiver 12 and the inner wall of the valve box 16 by the holding portion 13 of the float valve receiver 12 so that air flowing from the valve chamber inlet 19 flows without resistance.

Further, a lid 17 is placed on the upper part of the valve box 16, and a lid 17 is placed on the top of the valve box 16.
and the flange 24 of the lid 17 with the bolts 26.
Both are tightened and fixed by fixing means consisting of a nut 27 and a nut 27.

An exhaust hole 22 is formed in the center of the lid 17, and a valve seat 18 made of a ring-shaped sealing material is arranged on the lower surface of the lid 17 facing the exhaust hole 22.

Reference numeral 25 denotes an O-ring for watertightly sealing the abutting surfaces of the valve box 16 and the lid 17.

Further, 28 is a threaded joint formed on the valve chamber inlet 19 side of the valve box 16, and connects the valve box 16 and a conduit (not shown).

The operation of this embodiment will be explained.

When air passes through the valve chamber inlet 19, passes through the valve chamber 21, and is discharged to the outside from the exhaust hole 22, the air that has passed through the valve chamber inlet 19 flows through the streamline protrusion 7 of the float valve receiver 12.
The air is divided into those that flow into the air passageway 20 and those that flow into the through-holes 8.

The air flowing through the air passage 20 flows into the valve chamber 21 along the outer surface of the float valve receiver 12 without directly impinging on the float valve 14, and a portion of the air flows along the upper part of the float valve surface. flows.

At this time, since the float valve 14 and the float valve guide 12 form an ellipsoidal shape with low air resistance, the air resistance that the float valve 14 receives is small.

On the other hand, the air flow that has flowed into the through hole 8 of the float valve receiver 12 flows through the air hole 29 of the float valve 14, which communicates with the through hole 8.
flows into.

This air flow passes through the float valve 14 through the vent hole 29 and exits from the spout 9, but at this time, it merges with the vortex region of the air flowing along the upper surface of the float valve 14, causing a flow on the float valve surface. Prevents peeling.

As a result, no vortex-forming resistance is generated on the upper surface of the float valve 14, and together with the blocking effect of the float valve receiver 14, floating of the float valve is prevented.

The air that has flowed into the valve chamber 21 is then exhausted to the outside through the valve seat 18 and the exhaust hole 22.

Next, when the exhaust is finished and water is introduced into the valve chamber 21 of the valve box 16, the water that has passed through the valve chamber inlet 19 flows into the air passage 20 at the streamline protrusion 7 of the float valve receiver 12. and the water flowing into the through hole 8, both of which gradually rise while keeping the ice surface at the same height.

When the ice surface exceeds the submerged position of the float valve where the weight and buoyancy of the float valve 14 are well balanced, the float valve separates from the recess 30 of the float valve receiver 12 due to the buoyancy and valves together with the ice surface. Ascend chamber 21.

The float valve 14 is located at the lower valve seat 18 of the exhaust hole 22 of the lid 17.
When the water comes into close contact with the float valve 14 and the valve seat 18, the water is sealed and blocked from draining to the outside.

In addition, in the process where the float valve 14 moves up the valve chamber 21 together with the ice surface and comes into contact with the valve seat 18, the float valve 14
Due to the effect of the stabilizer 15, the float rises without being swayed by the water flow and comes into contact with the valve seat 18 such that the jet hole 9 of the float valve is located outside the ring formed by the valve seat 18.

Therefore, the water in the valve chamber 21 is not discharged to the outside through the air hole 29 of the float valve.

Furthermore, the case of draining the pipe connected via the threaded joint 28 of the valve box will be described.

As the water drains in the pipe, the pressure in the pipe goes down, and then the pressure in the valve chamber 21 also goes down.

When the pressure in the valve chamber 21 falls below the external pressure, the float valve 14 is separated from the valve seat 18 due to the external pressure and the weight of the float valve itself, and outside air is introduced into the valve chamber 21.

Therefore, the water in the valve chamber 21 flows into the pipe through the valve chamber inlet 19, and the float valve 14 also descends through the valve chamber 21 as the ice surface descends, and finally reaches the recess 3 of the float valve receiver 12.
It is accommodated in 0.

Then, while introducing outside air into the pipe line, the float valve 14
By being fitted and accommodated in the recess 30 of the float valve receiver 12, the float valve receiver 12 is housed stationary without being swayed by the air flow.

In addition, in the process of the float valve 14 being lowered and accommodated in the recess 30 of the float valve receiver 12, the float valve 14 is lowered without swinging due to the effect of the stabilizer 15.

Moreover, when stored in the recess 30 of the float valve receiver 12,
The insertion nozzle 11 of the float valve receiver is inserted and connected to the vent hole 10 of the float valve, and the through hole 8 of the float valve receiver and the vent hole 29 of the float valve are communicated with each other.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the air flow of a conventional spherical float valve, Fig. 2 is a schematic diagram showing the air flow of an ellipsoidal float valve, and Fig. 3 is a schematic diagram showing the air flow of an ellipsoidal float valve with holes. 4 and 5 show an embodiment of the air valve of the present invention, FIG. 4 is a longitudinal cross-sectional view of the air valve during exhaust operation, and FIG. 5 is a longitudinal cross-sectional view after exhaustion is completed. It is. 8...Through hole, 9...Spout port, 12.
... Float valve receiver, 14 ... Float valve, 15 ... Stabilizer, 16 ... Valve box,
19... Valve chamber inlet, 20... Air supply path,
29...Vent hole, 30...Recess.

Claims (1)

[Scope of Claims] 1. A float valve 14, which is removably housed in four parts 30 on the upper surface thereof, and an air passage 20 with a required gap is provided at the valve chamber entrance 19 so as to be connected to the inside of the valve box 16. The float valve 14 has a ventilation hole 2 penetrating from the bottom to the top.
9, the outlet 9 of the vent hole 29 is opened into the vortex region of air, and a stabilizer 15 is disposed at the lower part of the inside of the float valve 14. An air valve characterized by forming a through hole 8 that passes through the top and bottom and communicates with a ventilation hole 29 of the float valve. 2. A streamlined protrusion 7 is formed on the lower surface of the float valve receiver 12 facing the valve chamber inlet 19.
Air valves as described in Section.