JPS6316944Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air valve for discharging mixed air that is attached to a part of a liquid transport pipe such as a water supply pipe or a hot water transport pipe.

This type of air valve is well known as it is described in the specification and drawings of Japanese Patent Application No. 1983-65315 (Japanese Patent Application Laid-Open No. 54-1433) filed by the same applicant. In this known air valve, an inverted truncated cone-shaped float valve is housed in the valve box, and it closes the exhaust port provided at an eccentric position, and when the water level and internal pressure drop (below atmospheric pressure). ) The exhaust port side is in a suction state, but the other side falls downward due to its own weight, and the float valve becomes tilted, so the exhaust port gradually opens from one side, and the float valve completely closes. When the valve body falls onto the water surface, the air remaining inside the valve body is discharged to the outside.

[Problems to be solved by the invention] In the conventional air valve, the exhaust port opens when the float valve tilts, but the water level in the valve box must fall below a certain level for the float valve to tilt. Otherwise, it will not fall under its own weight, making it difficult to exhaust the air inside the valve box. Even if a small amount of air is discharged due to a slight inclination, the water level will drop by the amount of air discharged, and the discharge port will be immediately blocked by the float valve, and there will still be a considerable amount of air inside the valve box. However, it still has the problem of poor exhaust efficiency.

[Means for Solving the Problems] As a specific means for solving the above-mentioned problems, the present invention provides a valve seat and an exhaust port at an eccentric position of the upper cover, and an inlet hole at the center of the bottom. In an air valve with an inverted truncated conical float valve housed in the valve box,
The float valve is arranged so as to be guided by a pair of guide rods installed downward near the exhaust port, and an auxiliary exhaust port is formed in the upper lid above the exhaust port, and the auxiliary exhaust port A cylindrical auxiliary valve box is installed facing the auxiliary valve box, a float ball capable of blocking the auxiliary exhaust port is housed in the auxiliary valve box, and a plurality of communication holes are provided in the auxiliary valve box, and the auxiliary valve box is The present invention provides an air valve characterized in that the float valve is located higher than the position where the exhaust port is closed, and the provision of the auxiliary exhaust port and the auxiliary valve box makes it possible to close the main float valve. Even in the closed state, the air bubbles introduced into the valve box continue to be sequentially discharged to the outside from the auxiliary exhaust port, and even a small amount of bubbles can be efficiently and sequentially exhausted.

[Embodiment] Next, the present invention will be explained in more detail with reference to the illustrated embodiment. 1 is a valve box, and the upper part of the valve box is a lid 2.
The valve box is closed with a lid, and an inverted truncated conical float valve 3 is housed inside the valve box. A valve seat 5 having an exhaust port 4 in the center is attached to the upper lid 2 at an eccentric position via a screw piece 6, and a valve seat support 7 having an exhaust passage 7a connected to the exhaust port 4 is attached to the valve seat 5. The valve seat support is covered by a cover 8 so that it cannot be operated from the outside. The lid 2 itself is provided with a stepped portion 2a so that the float valve 3 is positioned approximately horizontally.

A pair of guide rods 9 are installed vertically downward in the vicinity of the exhaust port 4 and outside of the exhaust port 4 with an appropriate interval, and a pair of holes 10 are fitted into which the guide rods are slidably and loosely fitted. A groove 11 is formed near the end of the float valve 3 and on the side surface thereof.
In addition, 12 is a protrusion provided on the bottom of the valve box, 13 is an inlet, and 14 is a connecting thread.

The upper lid 2 is further provided with another auxiliary discharge port 15, and a cylindrical auxiliary valve box 16 is attached in communication with the auxiliary discharge port 15. This cylindrical auxiliary valve box 16
A float ball 17 capable of closing the auxiliary discharge port 15 is housed inside the auxiliary valve box, and a plurality of communication holes 18 and 19 are provided on the bottom and side surfaces of the auxiliary valve box. In particular, the auxiliary valve box 16 is located higher than the submerged position of the float valve 3. Liquid flows through the communication hole 18 on the bottom surface, and gas flows through the communication hole 19 on the side surface.

[Description of operation] The air valve of the present invention having the above configuration has an inlet port 13.
Therefore, gas flows into the valve box 1 along with the liquid, and when there is little liquid, the gas continues to be discharged to the outside from the exhaust port 4 and the auxiliary exhaust port 15 through both sides of the float valve 3. If more liquid than gas flows in, the float valve 3 will first gradually float up and block the exhaust port 4, causing exhaust only to be exhausted from the auxiliary exhaust port 15 (see Figure 2), but exhaust will still continue. , the float valve 3 will eventually be submerged in water. However, the small amount of gas remaining inside continues to be exhausted from the auxiliary exhaust port, and after most of the gas in the valve box 1 and auxiliary valve box 16 has been exhausted, the float ball 17 blocks the auxiliary exhaust port 15. The exhaust action will stop (see Figure 3). Therefore, since the residual gas in the valve box 1 is almost gone, the amount of gas taken in from the piping increases accordingly.

After a predetermined amount of gas has been introduced into the valve body 1, the evacuation action can be performed again from the position where the evacuation action has stopped. That is, a small amount of gas is sequentially introduced, gradually lowering the water level in the valve box 1, and the float valve 3 becomes floating on the water surface. However, since the pressure inside the valve box 1 is higher than atmospheric pressure, the float ball 17 remains adsorbed to the auxiliary exhaust port 15 and is not exhausted. Further gas is introduced, and the bottom of the main float valve 3 becomes separated from the water surface, and the water level gradually decreases to the extent that it tilts due to the float valve's own weight, and finally the float valve 3 tilts and falls. Therefore, when the gas is exhausted from the exhaust port 4, the internal pressure inside the valve box 1 decreases, so the float ball 17 that was adsorbed to the auxiliary exhaust port 15 falls, and the gas is also exhausted from the auxiliary exhaust port 15. This means that the air can be exhausted efficiently in a short period of time. In this case, since the float valve 3 is guided by the pair of guide rods 9, the opening/closing operation of the float valve 3 is accurate in the operation of closing the exhaust port 4 by tilting and falling, and furthermore, by resurfacing due to a rise in the water level. It is carried out in Since a large amount of gas passes through the pipe, there is little gas remaining inside the valve box 1.
Therefore, more gas can be introduced and a large amount of gas can be exhausted at once.

[Effects of the invention] As explained above, the air valve according to the invention has the following effects:
An air valve in which an inverted truncated cone-shaped float valve is housed in a valve box with a valve seat and an exhaust port located eccentrically on the top cover and an inflow hole in the center of the bottom, with the float valve facing downward near the exhaust port. A auxiliary exhaust port is formed in the upper cover above the exhaust port, and a cylindrical auxiliary valve is provided facing the auxiliary exhaust port. Install the box,
A float ball capable of closing the auxiliary exhaust port is housed in the auxiliary valve box, and a plurality of communication holes are provided in the auxiliary valve box, and the auxiliary valve box is located at a position where the float valve closes the exhaust port. By locating the structure further up, even after the float valve closes off the main exhaust port, the auxiliary exhaust port allows for continued evacuation, and subsequent small amounts of gas are removed. Even if the gas is introduced, the exhaust can be performed smoothly and quickly, and there is almost no residual gas in the valve box, which increases the amount of gas that can be taken into the valve box, significantly improving the exhaust efficiency of the gas passing through the piping. It has the excellent effect of increasing the

In addition, since the float valve is guided by a pair of guide rods, it is accurately guided from tilting and falling of the float valve to floating as the water level rises, and the opening and closing operations of the float valve are performed reliably. It is also effective.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of the air valve according to the present invention, Figure 2 is a longitudinal sectional view of the air valve according to the present invention;
The figure is a longitudinal cross-sectional view showing a state in which the main exhaust port of the air valve is closed, and FIG. 3 is a vertical cross-sectional view showing a state in which the auxiliary exhaust port of the air valve is closed. 1...Valve box, 2...Top lid, 3...Float valve, 4...Exhaust port, 5...Valve seat, 6...Screw piece, 7...Valve seat holder, 8...Cover, 9 ... Guide rod, 10 ... Hole, 11 ... Groove, 12 ... Protrusion, 1
3...Inflow port, 14...Connection thread, 15...
Auxiliary exhaust port, 16... Auxiliary valve box, 17... Float ball, 18, 19... Communication hole.

Claims (1)

[Scope of utility model registration request] An air valve in which an inverted truncated cone-shaped float valve is housed in a valve box with a valve seat and an exhaust port located eccentrically on the top cover and an inflow hole in the center of the bottom, with the float valve facing downward near the exhaust port. an auxiliary exhaust port is formed in the upper lid above the exhaust port;
A cylindrical auxiliary valve box is mounted facing the auxiliary exhaust port, a float ball capable of blocking the auxiliary exhaust port is housed in the auxiliary valve box, and a plurality of communication holes are provided in the auxiliary valve box, and the auxiliary valve box is provided with a plurality of communication holes. An air valve characterized in that an auxiliary valve box is located higher than a position where the float valve closes the exhaust port.