JP3314252B2 - Antifreeze 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 antifreeze air valve,
More specifically, the present invention relates to an antifreeze type air valve having an antifreezing structure for use in a cold region.

[0002]

2. Description of the Related Art Conventionally, water or the like contained in a fluid flowing through a pipeline is 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 structure of the conventional antifreeze type air valve is complicated, and it is not only difficult to manufacture the valve but also to perform maintenance.

Accordingly, an object of the present invention is to provide an antifreeze type air valve which can prevent freezing with a simple structure.

[0006]

In order to achieve the above object, an antifreeze type air valve according to the present invention has a cylindrical shape provided in a valve box.
An air valve for discharging air in the fluid flowing through the pipe by opening and closing the valve body to the guide member by vertical movement of the vertically movable housed float, tubular in a portion surrounding said guide member in said valve body -Shaped partition wall is provided, and a space defined by the partition wall outer periphery and the valve box inner periphery is an air layer for heat insulation ,
The space is opened only below the valve box . Further, the partition wall may be formed of an elastic body .

[0007]

According to the work for the present invention, by a work that Yusuke heat insulating air layer, the fluid in the valve body, i.e. the freezing of the fluid in the float portion of the partition wall inner periphery can be prevented. In addition, it becomes an air layer for heat insulation.
Since the space defined by the outer periphery of the partition wall and the inner periphery of the valve box is open only downward, the air in the valve box is exhausted by the operation of the air valve, and the fluid flowing in the main pipe flows through the valve. Even if it rises into the box, no fluid enters the space, and the space is in a state where air is trapped.
As a result, an air layer having a heat insulating effect is formed in the space, and the fluid in the valve box can be further prevented from freezing.

Further, if the partition wall is formed of an elastic body, even if the fluid freezes in the valve box, the expansion due to the freezing can be absorbed by the elastic body. Can be prevented.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. First, FIGS. 1 and 2 show a first embodiment of the present invention. This air valve 1 has a floating valve body 4 that floats inside a cylindrical guide member 3 provided in a valve box 2. A valve body 5 is accommodated in a vertically movable manner, and a partition wall 6 is arranged between the outer periphery of the guide member 3 and the inner periphery of the valve box 2.
A flange 7 for attaching to the main pipe is provided on the outer periphery of the lower opening 2a of the valve box 2, and a valve seat member 8 having a valve port 8a at a central portion is provided on an upper portion of the valve box 2, and the valve seat member And a cover 9 covering the cover 8.

The partition wall 6 is formed of an elastic body, for example, synthetic rubber or the like, in a cylindrical shape surrounding the guide member 3. I have. The lower end has an opening 6a through which air and fluid from the main pipe pass, and the upper end has a valve box 2
And a valve seat member 8, a flange 6b is hermetically clamped. Also, on the inner peripheral portion of the flange 6b,
The upper flange of the guide member 3 is locked so that the valve seat member 8
A step 6c is formed to be sandwiched between.

The air valve 1 shown in this embodiment operates in the same manner as a conventional air valve of this type. When a fluid, for example, water flows through the main pipe in the state shown in FIG. As shown by the arrow in FIG.
a into the valve box 2, rises from the opening 6 a of the partition wall 6 to between the partition wall 6 and the guide member 3, and further moves from the opening 3 a above the guide member 3 to the opening 8 a of the valve seat member 8. Through the space between the valve seat member 8 and the cover 9, the gas is discharged to the outside.

When the air in the main pipe is exhausted, water flows into the valve box 2, but the space S between the valve box 2 and the partition wall 6 is opened only below the valve box. Since the upper part is closed and there is no escape route for the air filling the space S, the water flowing into the valve box 2 does not flow into the space S, but flows into the partition wall 6. And flows into the guide member 3 through a water passage hole 3b formed in the bottom of the guide member 3, and floats the float valve body 4.

When the float valve element 4 floats, the floating valve element 5 is pushed upward, and the upper surface of the outer periphery of the floating valve element 5 presses against the valve seat on the lower surface of the valve seat member 8 to close the valve port 8a. I do. Thereby, the discharge of the air from the air valve 1 is completed,
The normal operation state shown in FIG. 1 results.

In this state, when the air contained in the water flowing in the main pipe flows into the valve box 2 and the water level in the valve box 2 drops to some extent, the weight of the float valve body 4 and the float valve body 4
The float valve body 4 descends in accordance with the balance with the buoyancy acting on the valve body, and the small valve seat 5a provided at the center of the floating valve body 5 opens to discharge the air above the valve box to the outside. The air valve 1 is
In a normal operating state, the air in the main pipe is discharged to the outside by repeating this minute evacuation operation.

On the other hand, when the water in the main pipe is discharged, the water level in the valve box 2 of the air valve 1 decreases due to the decrease in the pressure in the main pipe, and the weight of the float valve body 4 and the floating valve body 5 The float valve body 4 and the floating valve body 5 descend 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 flows in the direction opposite to the arrow in FIG. 2 and is sucked into the main pipe.

The air valve 1 shown in the present embodiment is similar to the air valve 1 shown in FIG.
In the state at the time of normal operation shown in (1), air is confined in the space S between the valve box 2 and the partition wall 6, so that the air in the space S acts as a heat insulating layer, Water in the valve box 2, that is, in the partition wall 6, can be prevented from freezing.

In particular, by forming the partition wall 6 with a material having a low thermal conductivity such as synthetic rubber, not only the thermal conductivity can be reduced, but also the water inside may be frozen in the case of use in an extremely cold region. However, since the expansion of water (ice) due to freezing can be released to the space S via the partition wall 6, breakage of the valve box 2 and the like can be prevented.

FIG. 3 shows a second embodiment of the air valve according to the present invention, in which a valve box 12 of an air valve 11 and a partition wall 13 provided on the inner periphery of the valve box 12 are integrally formed. Things. The same components as those of the air valve of the first embodiment are the same.
The same reference numerals are given and the detailed description is omitted .

Even when the partition wall 13 is formed integrally with the valve box 12, the partition wall 13 and the valve box 12 are formed as in the first embodiment.
By opening only the space S between the lower part and the lower part, an air layer having a heat insulating effect can be formed in the space S, and the fluid in the valve box 12 is prevented from freezing. Can be.

In the air valve of the present invention, the valve body
The structure of the valve and the relationship between the valve body and the float
It is not limited, and the conventional air valve of various configurations
It is possible to adopt the same configuration as
Type where the funnel and the floating valve body are connected by appropriate connection means
Can also be applied .

[0021] Also, the air valve of the present invention can be installed in a conduit sewer or various fluids other than water supply.

[0022]

As described above, the antifreeze-type air valve of the present invention has a cylindrical partition wall surrounding the float in the valve box, and the air between the inner circumference of the valve box and the outer circumference of the partition wall. Is formed by opening only the lower portion of the valve box , the air confined in the space acts as a heat insulating layer, and the fluid in the valve box can be prevented from freezing. And air
The air in the valve box is discharged by the operation of the valve and flows through the main pipe.
Even if the fluid that rises into the valve box,
Air does not enter, and air is trapped inside the space.
State. This has a heat insulating effect in the space
Air layer is formed, further preventing the fluid in the valve box from freezing.
Wear. In addition, since it can be formed with a simple structure only by providing a partition wall in the valve box, manufacturing costs can be reduced,
Further, by forming the partition wall with an elastic body, even if the fluid freezes, the valve body can be prevented from being damaged.

[Brief description of the drawings]

FIG. 1, showing a first embodiment of the present invention, is a cross-sectional view of an air valve showing a state during normal operation.

FIG. 2 is a cross-sectional view of the air valve similarly showing a state at the time of exhaustion.

FIG. 3 is a sectional view of an air valve according to a second embodiment of the present invention.

[Explanation of symbols]

1,11: air valve, 2,12: valve box, 3: guide member,
4 Float valve element, 5 Floating valve element, 6, 13 Partition wall,
8: Valve seat member, 8a: Valve port, S: Space

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 24/00 E03B 7/10 F16K 51/00

Claims (2)

(57) [Claims] 1. An air valve for opening and closing a valve body by up and down movement of a float housed in a tubular guide member provided in a valve box so as to be able to move up and down, and discharging air in a fluid flowing through a main pipe. wherein the portion surrounding the guide member is provided a cylindrical partition wall, fractionated by a inner said partition Setsukabe periphery and the valve box in the valve body
The space portion is made as a heat insulating air layer, the valve body under the space portion
An antifreeze type air valve that is open only to one side . 2. A contractor wherein said partition wall is formed of an elastic body.
The antifreeze air valve according to claim 1.