JP2590141Y2 - Air 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 air valve, and more particularly, to an air valve which can be miniaturized and prevented from freezing.

[0002]

2. Description of the Related Art Conventionally, water or the like mixed in a fluid flowing in a pipeline has been discharged into a pipeline such as a water supply system.
An air valve is provided for sucking air into the pipeline when discharging the fluid in the pipeline. This air valve generally accommodates a float in a float chamber formed at a lower portion of a valve box so as to be able to move up and down, and activates a valve element provided at an upper portion of the valve box by the up and down movement of the float, thereby discharging air. It is configured to perform inhalation.

[0003] In addition, an air valve used in a cold region covers the air valve with a heat insulating material to prevent the fluid in the air valve from freezing and damaging the air valve. As in the air vent valve described in Japanese Patent Application Laid-Open No. 54-84625, a part of the fluid flowing through the pipeline is introduced into the valve box, and the fluid in the valve box is frozen by the thermal energy of the introduced fluid. I was trying to prevent it.

[0004]

However, the conventional air valve is usually provided with a sub-valve between the main line of the pipe through which the fluid flows, so that the height of the air valve increases, There were restrictions on where the valve could be installed. Further, when an air valve is directly connected to the main pipe without providing a sub-valve, it is necessary to take measures such as stopping fluid in the main pipe when performing maintenance of the valve body of the air valve.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air valve having a structure in which the height can be reduced while having a sub-valve, and the fluid in the valve box can be prevented from freezing.

[0006]

In order to achieve the above-mentioned object, the air valve of the present invention is provided at the upper part of the valve box by vertically moving a float housed in a float chamber below the valve box so as to be vertically movable. In an air valve for opening and closing a valve body to discharge air in a fluid flowing through a main pipe, a float chamber at a lower portion of the valve box is embedded in a main pipe flow path, and the float is provided on a body side wall of the float chamber. A sub-valve for opening and closing the room and the main pipe is provided.

[0007]

[Operation] According to the above configuration, since the float chamber is embedded in the main pipe, the height of a portion protruding from the main pipe can be reduced. Further, since the auxiliary valve is provided, maintenance of the valve body can be easily performed. Moreover, the float chamber at the lower part of the valve box in which the fluid is stored is embedded in the main pipe, and the outer peripheral surface thereof receives the thermal energy of the fluid flowing in the main pipe, so that the internal fluid does not freeze, The valve bottom at the top of the valve box does not freeze because it is always filled with air.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 is a sectional view of the air valve, FIG. 2 is an overall view, and FIG. 3 is a sectional view of the air valve in a normal operation state.

First, as shown in FIG. 1, an air valve 1 includes a valve box 3 having a float chamber 2 at a lower portion, a valve body 4 at an upper portion of the valve box 3, and a cap for covering the valve body 4. 5, a sub-valve 6 provided on the body side wall of the float chamber 2, a float 7 accommodated in the float chamber 2, and a link mechanism 8 for transmitting the vertical movement of the float 7 to the valve body 4. It consists of. A flange 9 for attaching the air valve 1 to the main pipe is provided on the outer periphery of the body of the valve box 3.
A handle 10 for opening and closing the valve body 6a is provided via a shaft 6b passing through the flange 9.

[0010] The valve element portion 4 includes a hat-shaped floating valve element 41.
And a small valve element 42 provided in the floating valve element 41. The floating valve element 41 is guided by a guide portion 5a formed in the cap 5 and is mounted on an upper portion of the valve box. 4
3 moves vertically between the receiving member 44 protruding from the inner peripheral wall, and the floating valve element 41 and the valve seat 43 come into contact with each other at the ascending position to be in a closed state. An air passage 45 is formed between the inner circumference of the box 3. In addition, small valve element 4
2 is a small valve seat 46 provided at the upper center of the floating valve body 41.
And is urged in the closing direction by a spring 47, and is connected to the float 7 via the link mechanism 8.

As shown in FIG. 2, the air valve 1 has an upper opening 12a of an air valve mounting pipe 12 interposed in a main pipe 11.
Then, the sub-valve 6 is attached to the float chamber 2 portion of the valve box 3 and the sub-valve 6 is embedded in the pipe 12 with the sub-valve 6 facing upstream. In addition, the upper edge of the sub-valve 6 is substantially flush with the inner peripheral upper surface of the air valve mounting pipe 12 so that the air in the air valve mounting pipe 12 can flow into the air valve 1. Is desirable.

As the air valve mounting pipe 12, a general cheese, T-shaped pipe, or the like can be used.
When it is necessary to prevent freezing of the air, the water flowing in the main pipe 11 always comes into contact with the valve box 3 of the air valve 1 and flows.
It is preferable to use a tube having a shape as shown in FIG. 2 in which the vicinity of the upper opening 12a bulges upward. In addition, it is possible to attach to a pipe of the same size as the main pipe 11, but since the flow path resistance increases, it is necessary to consider it.

As described above, the sub-valve 6 is provided on the body side wall of the float chamber 2 provided below the valve box 3 of the air valve 1, and the float chamber 2 and the sub-valve 6 are embedded in the air valve mounting pipe 12. By mounting the air valve 1, the height of the air valve 1 with respect to the main pipe 11 can be made significantly lower than in the past. As a result, it is possible to easily cope with a water main provided in a place having a height limit, for example, a water main provided along a bridge. By closing the sub-valve 6, the maintenance of the valve body 4 can be easily performed.

Further, the air valve 1 is mounted on the air valve mounting pipe 12 in the state shown in FIG.
When the water flows through the main pipe 11, the air in the main pipe 11 flows into the valve box 3 of the air valve 1 through the auxiliary valve 6, and the air passage 45 of the valve body 4 or the exhaust hole 46a of the small valve seat 46. , Guide part 5a
1 through the lower space of the cap 5 through the through hole 5b.

When water flows into the valve box 3 and the float 7 starts to float, first, the link mechanism 8 is moved with the rise of the float 7.
, The small valve element 42 of the valve element portion 4 moves upward, and the small valve element 42
Abuts on the small valve seat 46 to close the exhaust hole 46a of the small valve seat 46. Even in this state, the air flowing into the valve box 3 from the main pipe 11 remains in the air passage 45 between the floating valve element 41 and the valve box 3.
Is discharged from

When the discharge of the air in the main pipe 11 proceeds and the water level in the valve box 1 further rises, the upward movement of the float 7 causes the small valve body 4 to move upward.
2, the floating valve 41 moves upward together with the float 7, and finally the floating valve 41 comes into contact with the valve seat 43 as shown in FIG. 1 is in a closed state.

In the state shown in FIG. 3, the portion of the lower part of the valve box 3 where water accumulates, that is, the outer periphery of the float chamber 2 is in contact with the water flowing through the main pipe 11, so that the flowing water is retained. The water in the valve box 3 is heated by thermal energy to prevent freezing, and the air valve 1 due to the freezing of water in the valve box 3
Can be prevented from being damaged.

In the state shown in FIG. 3, when air entrained in the water flowing through the main pipe 11 flows into the valve box 3 through the sub-valve 6 and the water level in the float chamber 2 drops to some extent. , The weight of the float 7, the buoyancy acting on the float 7, the urging force of the spring 47 for urging the small valve element 42, and the valve box 3
The small valve body 42 descends in accordance with the balance of the internal pressure of the valve, opens the small valve seat 46, and allows air in the upper part of the valve box to pass through the exhaust hole 46a through the through hole 5.
Exhaust through b. In a normal operation state, the air valve 1 repeats the minute exhaust operation to discharge the air in the main pipe 11 to the outside.

On the other hand, when the water in the main pipe 11 is discharged,
As the pressure in the main pipe 11 decreases, the water level in the float chamber 2 of the air valve 1 decreases, and the weight of the float 7 and the floating valve body 41
The floating valve body 41 descends according to the balance between the weight of the valve body and the pressure difference between the inside and outside of the valve box, and a large amount of outside air is discharged from the air passage 45 to the main pipe 1.
It is sucked into 1.

As described above, the air valve 1 shown in this embodiment is
Air can be discharged and sucked in the same way as a conventional air valve, and the height of the valve can be made significantly lower than before, while having a sub-valve 6 required for maintenance of the valve body portion 4. In addition, freezing of water in the valve box 3 can be prevented.

In the air valve according to the present invention, the structure of the valve body and the relationship between the valve body and the float are not limited to the above-described embodiment, but are the same as those of conventional air valves having various structures. It is also possible to adopt the configuration of, for example, a type having no floating valve element or a type using the float itself as a valve element. In addition, the air valve of the present invention can be installed in sewers other than waterworks or in pipelines of various fluids.

[0022]

As described above, the air valve of the present invention embeds the float chamber below the valve box in the main pipe, and opens and closes the float chamber and the main pipe on the body side wall of the float chamber. Since the partitioning sub-valve is provided, the height of the air valve can be significantly reduced compared to the conventional air valve while maintaining the same operation as the conventional air valve. Furthermore, the portion of the valve box at the lower portion where water or the like accumulates is always exposed to the circulating fluid on its outer periphery and receives the thermal energy of the fluid, so that the water in the valve box does not freeze, Also, since the upper part of the valve box is an air layer, it does not freeze as well,
The air valve is not damaged by freezing even when used in cold regions, and has the performance as an antifreeze air valve.

[Brief description of the drawings]

FIG. 1 is a sectional view of an air valve according to an embodiment of the present invention.

FIG. 2 is an overall view showing a state of being attached to a water main.

FIG. 3 is a sectional view of the air valve in a normal operation state.

[Explanation of symbols]

1 ... air valve, 2 ... float chamber, 3 ... valve box, 4 ... valve body,
5 ... Cap, 6 ... Sub valve, 7 ... Float

Claims (1)

(57) [Scope of request for utility model registration] An up / down movement of a float housed in a float chamber at a lower portion of a valve box to open and close a valve body provided at an upper portion of the valve box to discharge air in a fluid flowing through a main pipe. In the air valve, the float chamber below the valve box is embedded in the main pipe flow path, and a sub-valve that opens and closes the float chamber and the main pipe in the body side wall of the float chamber is provided. Pneumatic valve.