JPS6312280Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a valve device, particularly an air vent, and uses the opening force of a valve body that is opened and closed by an output mechanism (a float weight transmission mechanism) provided in a fluid circuit. This is to reduce the amount of noise and improve the sensitivity of air vent operation.

A conventional air vent has the configuration shown in Figure 1, and a lift valve is used to open and close the fluid circuit, with a connection port to the fluid circuit at the bottom and an air outlet at the top. A float 3 is placed inside the cylindrical main body 1.
is accommodated in a free state, and the lift valve 4, which is interlocked with the float by a link mechanism, is configured to face a valve seat formed at the upstream end of the air outlet.

In this conventional device, in a normal state, the float 3 is lifted upward by the buoyancy of water stored in the main body 1, and on the other hand, the lift valve 4
Since the valve closing biasing force of the spring 5 acts on ,
This lift valve 4 is maintained in a closed state.

When the amount of air in the fluid circuit increases and the amount of air in the main body 1 increases, the water level in the main body 1 falls and the buoyant force acting on the float 3 decreases, causing the float 3 to drop.
The weight of the body is transmitted to the lift valve 4 via the link mechanism, the lift valve 4 opens, the air inside the body 1 is discharged to the outside, and when the water level inside the body 1 returns to a constant water level, it acts on the float 3. The lift valve 4 is closed by the buoyant force.

However, in this conventional device, a large force is required to open the lift valve 4, and there is a problem that the lift valve 4 does not operate smoothly if a small amount of dirt gets stuck in the link mechanism or the like.

This is because the fluid circuit internal pressure, that is, the internal pressure of the main body 1 directly acts on the lift valve 4 in the closing direction.

In the present invention, a float 3 is provided in a free state in a hollow cylindrical body 1 connected to a fluid circuit, and the upstream side of an air outlet provided at the top of the body 1 is biased in a normally closed direction. The main body 1 is closed by the valve body
In an air vent in which the valve body is opened by the force of gravity acting on the float 3 when the water level inside the air vent falls, the sensitivity of the valve opening operation is improved and the operation is made smooth. In order to do this, the technical problem is to make the pressure within the main body 1 act as a valve opening force for the valve body.

The technical means of the present invention taken to solve the above-mentioned technical problems are as follows: The valve body that closes the air outlet of the main body 1 is compressed by an elastic tube 9 made of rubber, plastic, etc. to block the flow path. As the model pinch valve,
One of the clamping means is a fixed clamping member 14 provided on the upper wall of the main body 1, and a movable clamping member 15 facing this is connected to the upper end of the support shaft of the float 3, so that the support shaft is The elastic tube 9 is supported in the main body 1 so as to be movable up and down, and the upstream side of the clamping portion of the elastic tube 9 is opened into the main body 1.

The above technical means of the present invention operates as follows.

When the amount of air stored in the main body 1 is below a certain level, the water level in the main body 1 is high, and the pinch valve is maintained in the closed state by the biasing force acting in the normally closed direction. When the amount of air stored in the main body 1 increases,
As the water level in the main body 1 falls, the gravitational force acting on the float 3 increases, and the support shaft of the float 3 descends together with the float 3, causing the clamping member 15 to move downward in a direction away from the fixed clamping member 14. . This results in
The pinching portion of the elastic tube 9 is opened, the pinch valve is opened, and the stored air is discharged from the air discharge port. Here, in the closed state of the pinch valve, the upstream side of the pinching part is open into the main body 1, so the inside and outside of the tube wall on the upstream side of the pinching part in the elastic tube 9 are under the same pressure condition. The valve is placed in a state where the valve closing force is canceled out by the fluid pressure.

As described above, when the water level in the main body 1 returns to the predetermined water level after the pinch valve is opened, the acting force of the float 3 is also reduced, and the pinch valve is closed by the biasing force in the normally closed direction.

Thereafter, the pinch valve repeats opening and closing according to changes in the amount of air stored in the main body 1, that is, the water level in the main body 1, and the amount of air stored in the main body 1 is always kept constant.

Since the present invention has the above configuration, it has the following unique effects.

Since the pinch valve is closed while the inside and outside of the pipe wall on the upstream side of the pinching part of the elastic tube 9 are placed under the same pressure condition, the opening force of the valve, that is, the opening force of the air outlet is reduced accordingly. As a result, the sensitivity of the air vent is improved compared to the conventional ones mentioned above, and the operation becomes smooth.

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

The first embodiment shown in FIG. 2 is an air vent using a pinch valve, and like the conventional one described above, a cavity 7 is provided in the main body 1, and a float 3 can be freely raised and lowered in the cavity. The pinch valve is opened and closed by lifting and lowering a shaft portion 8 inserted into the float.

The float is a solid body made of synthetic resin, and its specific gravity is less than or equal to 1 and close to this value. For example, a synthetic resin with a specific gravity of about 0.95 is used.

Reference numeral 9 denotes an elastic tube, which is an open-end tube with flanges 10 protruding from both ends, and is attached to a valve chamber 11 provided at the upper part of the main body 1, and is attached to the base of the opening provided at both ends of the valve chamber. The flange portions are located at the end steps, and the flange portions 10, 10 are compressed by a threaded cylinder 12 and a blind screw 13 that are screwed into the openings.

In the middle of the elastic tube, a pair of clamping members 14,
15 are facing each other, one clamping member 15 is slidably embedded in a fixed wall 16 at the upper part of the main body 1, and an adjustment screw 17 rotatably connected to the clamping member is screwed into the fixed wall. In addition, the tip thereof protrudes outward. Further, the lower part of the adjustment screw is a threadless part, and an O-ring 1 is inserted between it and the hole in the fixed wall 16.
8 is interposed to ensure airtightness of the sliding part.

The upper part of the elastic tube is entirely covered by the fixed wall 16, but the lower part of the elastic tube is exposed to the cavity 7 side up to the lower clamping member 15 and its vicinity, and is blinded. A through hole 19 is bored in the exposed portion of the tube wall on the plug 13 side.

The above-mentioned shaft portion 8 is connected to the clamping member 15, and the shaft portion passes through the support plate 20 fixed at the upper part of the cavity 7 so as to cross the cavity, and extends downward. It is inserted into the float 3 provided below the plate 20, and the float 3 is attached to the shaft portion 8 by a stopper 21 provided at the lower end of the shaft portion.
is supported by

A spring 5 is fitted onto the upper part of the shaft portion 8 and is interposed between the clamping member 15 and the support plate 20, and the biasing force of the spring is set appropriately to apply a suitable clamping force to the clamping member 15. I've let it happen.

Furthermore, at the lower end of the main body 1 there is an inlet 2 that communicates with the empty chamber 7.
2 is provided, and an outlet hole 2 is provided in the cylindrical screw 12.
3, and a flow path from the inlet 22 → the cavity 7 → the through hole 19 → the inside of the elastic tube 9 → the outlet hole 23 is formed.

The air vent of the embodiment described above is installed, for example, at the highest water level of a hot water circuit of a water heater or the like, so that the inside of the main body 1 communicates with the inside of the hot water circuit through the inlet 22.

To explain in more detail the effect of this usage state, in the state shown in the figure, the chamber 7 is almost full of water and the float 3 is at the highest position. Therefore, the shaft portion 8
The gravity of the float 3 does not act on the valve, or this gravity is extremely small, and the pressing member 15 presses the middle of the elastic tube 9 by the biasing force of the spring 5, so that the valve is closed. In this valve-closed state, the upstream side of the clamping member 24 in the elastic tube 9 communicates with the cavity 7 side via the through hole 19, so the force acting on the valve-closing side is absorbed by the clamping member 15. Only the clamping force and the force acting on the downstream pipe wall 25 are used.

Next, when the air contained in the hot water circuit accumulates in the empty chamber 7 and the amount of stored air increases, the empty chamber 7
The water level inside will drop. When the water level reaches the working water level 2, a descending force corresponding to the difference between the weight of the float 3 and the buoyancy of the submerged part acts on the shaft part 8, and the shaft part, that is,
The pinching member 15 is pulled down against the spring 5.

When the pinching member 15 is pulled down, the pinching part 24
is opened by the elastic return force of the tube wall of the elastic tube 9,
Air is removed. At the same time as this air removal, the water level in the empty chamber 7 rises and reaches the predetermined water level 6, the float 3 rises, the descending force of the shaft part 8 disappears, and the pinching part 15 is moved by the biasing force of the spring 5. 24 to block the flow path.

Next, as shown in FIG. 4, in the embodiment shown in FIG.
9, the through hole 19 is placed upward, and a fixed pressure surface 27 is provided on the periphery of the through hole,
A disk-shaped clamping member 15 is placed on the opposite side of the through hole 19.

Further, the empty chamber 7 is connected to the through hole 1 through a passage 28 extending from the central outer circumference of the elastic tube to above the through hole 19.
9 and the inside of the elastic tube 9, and other parts are constructed in the same manner as in the first embodiment.

Even in this case, at the highest position of the float 3,
The pinching member 15 presses one wall of the elastic tube 9 against the opposing wall, and the annular rib 26 is pinched between these two walls. Since the entire outer periphery of the annular rib is continuous with the inner surface of the elastic tube, the inside and outside of the annular rib 26 are blocked by the close contact between the annular rib and the tube wall. That is, the upstream side of the through hole 19 of the elastic tube 9 and the open end of the elastic tube 9 are cut off.

Next, when the water level in the chamber 7 falls and a predetermined gravity is generated on the float 3, the clamping member 15 descends and releases the clamping pressure on the elastic tube 9, creating a gap between the annular rib 26 and the tube wall. As a result, the empty chamber 7 and the open end of the elastic tube 9 communicate with each other, and air is removed.

In this way, this second embodiment also functions as an air vent like the first embodiment.

In the second embodiment, the through hole 19 is provided in the tube wall in the area where the annular rib 26 is attached, so the area where the annular rib 26 is attached to the tube wall that the clamping member 15 is in contact with is inside and outside. The pressure is the same, and the force acting on the pipe wall in the valve closing direction is smaller than in the first embodiment. Therefore, the force required to open the valve is reduced, resulting in a valve that can be opened and closed with light force. In particular, in the case of the second embodiment, since the annular rib 26 is compressed between the pipe walls facing each other, airtightness can be ensured compared to a pinch valve that blocks the flow path by pressing the pipe walls against each other. The amount of money spent on crushing increases,
Improves valve closing performance.

In the case of the embodiment shown in FIG. 2, even if the cavity 7 and the upstream side of the clamping portion 24 are communicated through the communication passage 29, the same effect as in the first embodiment is obtained. In this case, the through hole 19 is not necessary.

Furthermore, in the embodiment shown in FIG. 2, since the height of the clamping member 14 on the fixed side can be adjusted, the clamping force with the other clamping member 15 can be easily finely adjusted, and the operating pressure can be adjusted accurately. Can be set.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is a sectional view of the first embodiment of the present invention, Fig. 3 is a sectional view of the second embodiment, and Fig. 4 is a sectional perspective view of an elastic tube used therein. In the figure, 9... elastic tube, 15... pinching member, 19... through hole.

Claims (1)

[Scope of utility model registration request] A float 3 is provided in a free state in a hollow cylindrical main body 1 connected to a fluid circuit, and the upstream side of an air exhaust port provided at the top of the main body 1 is closed by a valve body biased in a normally closed direction. In the air vent in which the valve body is opened by gravity acting on the float 3 when the water level in the body 1 falls, the body 1
The valve body that closes the air outlet of the main body 1 is a pinch valve that pinches an elastic tube 9 made of rubber, plastic, etc. to block the flow path, and one of the pinching means is fixed to the upper wall of the main body 1. A movable clamping member 15 facing the clamping member 14 is connected to the upper end of the support shaft of the float 3, and the support shaft is supported in the main body 1 so as to be movable up and down, and the clamping member 15 of the elastic tube 9 is An air vent whose upstream side is open into the main body 1.