JP4100862B2 - Exhaust structure of air valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an exhaust structure of an air valve, and relates to a technology of an air valve provided in the middle of a sewer pipe.
[0002]
[Prior art]
Examples of this type of air valve include those shown in FIGS. 3 to 4, the valve box 1 has a float chamber 5 formed between a bottom lower opening 2 communicating with a pipe line and an upper opening 4 to which a valve box lid 3 is attached. A splash guard 6 is provided. The valve box lid 3 has an opening for forming the valve chamber 7 in the central portion, and is supported by the splash eliminator 6 on the lower surface and the strainer 8 is disposed, and the seat 9 is disposed on the upper surface so as to cover the opening, Large air holes 10 are formed in the sheet 9.
[0003]
A spring box 12 is provided above the valve box cover 3 via a support bolt 11, a cover 13 is disposed so as to cover the spring box 12, and a diaphragm 14 is interposed between the spring box 12 and the cover 13. Yes. The diaphragm 14 partitions a space formed by the spring box 12 and the lid 13 into an upper pressure chamber 15a and a spring chamber 15b. The spring box 12 is formed with a communication hole 16 for communicating the spring chamber 15b with the atmosphere, and the lid 13 is formed with a minute hole 17 for communicating the pressure chamber 14 with the atmosphere.
[0004]
A valve body 18 that opens and closes the large air hole 10 is disposed in the valve chamber 7, and the valve body 18 and the diaphragm 14 are connected by a valve rod 19. The diaphragm 14 is sandwiched between the upper pressing portion 14a and the lower pressing portion 14b, and is connected to the valve stem 19 by tightening the nut 14c. In the spring chamber 15b, a spring 15c for urging the valve body 18 in the closing direction via the diaphragm 14 and the valve rod 19 is disposed. The valve rod 19 has a small air hole 19 a penetrating in the axial direction. The small air hole 19 a communicates the pressure chamber 15 a and the valve chamber 7. The valve body 18 has a large air hole valve seat (not shown) on the upper surface that comes into airtight contact with the seat 9, and has a small air hole valve seat (not shown) arranged on the lower surface so as to cover the lower end opening of the small air hole. is doing.
[0005]
A shaft 20 is disposed at the lower end of the valve body 18. The shaft 20 has a small air hole valve body whose head is in contact with the small air hole valve seat to open and close the small air hole, and a long pin 21 formed on the upper end side is provided with a snap pin (not shown). ) Is suspended from the valve body 18 so as to be vertically movable over a position where both the small air hole valve body and the small air hole valve seat are in contact with each other and a position where both are separated from each other. A float 22 is attached to the lower side of the shaft 20, and a flapper 23 is provided at the lower end of the float 22.
[0006]
The operation of the above-described configuration will be described. The water flowing through the pipeline flows into the valve box 1 from the lower opening 2, and the float 22 rises as the water level in the float chamber 5 of the valve box 1 increases. As the float 22 rises, the shaft 20, the valve body 18 and the valve stem 19 rise integrally, and the small air hole valve body of the shaft 20 abuts against the small air hole valve seat of the valve body 18 to make the small air hole 19 a. The valve body 18 is brought into contact with the seat 9 at the large air hole valve seat to close the large air hole 10.
[0007]
The air entrained by the flowing water and flowing through the pipeline flows into the inside of the valve box 1 from the lower opening 2, and the water level in the float chamber 5 of the valve box 1 decreases as the air accumulates in the float chamber 5. When the water level in the float chamber 5 falls below the lower limit water level, the buoyancy acting on the float 22 decreases, and the float 22 descends when the float weight exceeds the buoyancy. At this time, the valve body 18 receives the air pressure inside the valve chamber 7 and maintains the closed state, and descends in the range of the long hole 21 where the float 22 and the shaft 20 engage with the snap pin.
[0008]
The small air hole 19a is opened by the lowering of the shaft 20, and the air pressure inside the valve chamber 7 flows into the pressure chamber 15a through the small air hole 19a. At this time, since the pressure chamber 15a is only in communication with the atmosphere through the micro holes 17, the diaphragm 14 expands due to a sudden inflow of air and urges the valve rod 19 and the valve body 18 in the opening direction. The valve body 18 is opened when the force and the weight of the valve rod 19, the valve body 18, the shaft 20, and the float 22 are superior to the force of the air pressure inside the valve chamber 7, and the valve chamber 7 and the float are opened through the large air hole 10. The air in the chamber 5 is exhausted to the atmosphere.
[0009]
By this exhaust, the water level inside the float chamber 5 rises, and the float 22, the shaft 20, the valve body 18, and the valve stem 19 rise together as a result of the buoyancy and the biasing force of the spring, and return to the closed state. At this time, the air in the pressure chamber 15 a is exhausted through the micro holes 16. The splash eliminator 6 of the float chamber 5 blocks the splashes scattered from the fluid surface, and the strainer 8 captures the dust scattered with the splashes.
[0010]
[Problems to be solved by the invention]
However, in the conventional configuration described above, when draining the fluid in the pipe, outside air is sucked into the valve box 1 through the large air hole 10 and air is taken into the pipe from the valve box 1. During this intake, the shaft 20 opens the small air hole 19a, and the valve body 18 is in a state where the large air hole 10 is opened.
[0011]
At this time, since the pressure chamber 15a is merely communicated with the atmosphere through the micro holes 17, when the air in the pressure chamber 15a is sucked into the valve box 1 through the small air holes 19a, the pressure chamber 15a becomes negative pressure, and the diaphragm 14 contracts. Due to the contraction of the diaphragm 14, the valve body 18 is urged in the closing direction, the opening of the large air hole 10 is narrowed, and smooth intake cannot be performed. Further, the diaphragm 14 is sandwiched between the upper pressing portion 14a and the lower pressing portion 14b, and is connected to the valve stem 19 by tightening the nut 14c. Therefore, the diaphragm 14 is elastically deformed when the nut 14c is tightened, and its restoration is performed. Due to the force acting on the valve stem 19, the valve element 18 is inclined and there is a problem that the water stoppage is lowered.
[0012]
The present invention solves the above-mentioned problems, eliminates the fastening of the diaphragm and the valve stem, prevents plugging of the valve body during intake, and holds the valve body in an appropriate posture to exhibit reliable sheet properties It aims at providing the exhaust structure of a valve.
[0013]
[Means for Solving the Problems]
In order to solve the above-described problems, an air valve exhaust structure according to the present invention has a pressure chamber in which a large air hole is formed in an upper portion of a valve box, a diaphragm is provided above the large air hole, and the air communicates with the atmosphere through the minute hole. A small air hole that connects the pressure chamber and the space in the valve box to the valve rod, which has a valve element that opens and closes the large air hole at the lower end side of the valve rod. In the air valve in which a shaft that opens and closes a small air hole is movably connected to the lower part of the valve body, and a float is provided on the shaft,
A through-hole through which the valve rod is inserted is formed in the diaphragm, and a diaphragm receiving portion that contacts and separates from the inner peripheral edge of the through-hole is provided on the valve rod so as to face the lower surface of the diaphragm.
[0014]
With the configuration described above, the valve body moves in the closing direction as the float rises. At this time, the valve rod moves upward while the shaft closes the small air hole, presses the diaphragm while the diaphragm receiving part closes the through hole, exhausts the air in the pressure chamber from the minute hole, and removes the diaphragm. Shrink.
[0015]
On the other hand, when exhausting under pressure, the shaft descends with the float to open the small air hole, and the air pressure in the valve box acts on the pressure chamber through the small air hole, so that the diaphragm receives the inner periphery of the through hole. It expands in a state where it is pressed against the part, and pushes down the valve stem and valve body in the direction of opening.
[0016]
At the time of intake to drain the fluid in the piping, the shaft descends together with the float to open the small air hole, and the large air hole is opened by the lowering of the valve body. In this state, outside air enters the valve box through the large air hole. Inhale.
[0017]
At this time, since the diaphragm and the valve stem are not mechanically fastened, when the air in the pressure chamber is sucked into the valve box through the small air hole, the inner peripheral edge of the through hole of the diaphragm is pushed by the external pressure. The air is separated from the diaphragm receiving portion, and outside air flows into the pressure chamber through the through hole. This prevents the pressure chamber from becoming negative pressure during intake and prevents the diaphragm operation from reaching the valve stem.
[0018]
Further, by not mechanically fastening between the diaphragm and the valve stem, the valve body can be held in an appropriate posture without being affected by the distortion of the diaphragm or the like even in a normal state.
[0019]
Embodiment
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Components that perform the same operations as those described in FIGS. 3 to 4 are given the same reference numerals and description thereof is omitted.
[0020]
1 and 2, the diaphragm 14 is fixedly mounted by sandwiching the outer peripheral edge side between a spring box 12 and a lid 13 and connecting them with support bolts 11, and a valve rod 19 is inserted in the center. A through-hole 14d is formed.
[0021]
The valve stem 19 has a small-diameter portion 19b on the head end side, and a diaphragm receiving portion 24 is disposed by being fitted to the small-diameter portion 19b. The diaphragm receiving portion 24 is connected to the valve rod 19 by a nut 14c via a sleeve 25. It is concluded to. The diaphragm receiving portion 24 faces the lower surface of the diaphragm 14 and is in contact with and separated from the inner peripheral edge 14e of the through hole 14d.
[0022]
Hereinafter, the operation of the above configuration will be described. The float 22 rises as the water level in the float chamber 5 increases. As the float 22 rises, the shaft 20 closes the small air hole 19a, and the shaft 20, the valve body 18, and the valve stem 19 rise integrally. The body 18 comes into contact with the seat 9 and closes the large air hole 10. At this time, the diaphragm receiver 24 presses the diaphragm 14 in a state in which the through hole 14 d is closed by the upward movement of the valve rod 19, and the air in the pressure chamber 15 a is exhausted from the minute hole 17 to contract the diaphragm 14.
[0023]
As the air flowing into the inside of the valve box 1 from the lower opening 2 accumulates in the float chamber 5, the water level of the float chamber 5 decreases, the buoyancy acting on the float 22 decreases, and the float weight is superior to the buoyancy. 22 and the shaft 20 descend in the range of the long hole 21 that engages with the snap pin, and the small air hole 19a is opened when the shaft 20 descends. At this time, the valve body 18 receives the air pressure inside the valve chamber 7 and maintains the closed state.
[0024]
As shown in FIG. 2, when the air pressure inside the valve chamber 7 acts on the pressure chamber 15a through the small air hole 19a, the diaphragm 14 expands with the inner peripheral edge 14e of the through hole 14d pressed against the diaphragm receiving portion 24. The valve rod 19 and the valve body 18 are urged in the opening direction. The urging force and the weight of the valve rod 19, the valve body 18, the shaft 20, and the float 22 are superior to the force of the air pressure inside the valve chamber 7, so that the valve body 18 is opened and the valve chamber 7 passes through the large air hole 10. The air in the float chamber 5 is exhausted to the atmosphere.
[0025]
At the time of intake for draining the fluid of the pipe, the shaft 20 descends together with the float 22 to open the small air hole 19a, and the large air hole 10 is opened by the lowering of the valve body 18, and in this state, the large air hole 10 is passed through. Outside air is sucked into the valve box 1.
[0026]
At this time, as shown in FIG. 1, since the diaphragm 14 and the valve stem 19 are not mechanically fastened, if the air in the pressure chamber 15a is sucked into the valve box 1 through the small air hole 19a, the communication is established. The inner peripheral edge 14e of the through hole 14d of the diaphragm 14 is separated from the diaphragm receiving portion 24 by being pushed by the atmospheric pressure acting on the spring chamber 15b through the hole 16, and the outside air flows into the pressure chamber 15a through the through hole 14d. This prevents the pressure chamber 15a from becoming negative pressure during intake, and prevents the operation of the diaphragm 14 from reaching the valve rod 19. Further, since mechanical fastening is not performed between the diaphragm 14 and the valve stem 19, the valve stem 18 is not affected by the distortion of the diaphragm 14 or the like in the normal state, so that the valve body 18 is in an appropriate posture. Can be retained, and the water stoppage is not impaired.
[0027]
【The invention's effect】
As described above, according to the present invention, since the diaphragm and the valve stem are not mechanically fastened, the air in the pressure chamber is sucked into the valve box through the small air holes when the pipe fluid is discharged. Then, the inner peripheral edge of the through hole of the diaphragm is pushed away by the external air pressure and separated from the diaphragm receiving portion, and the outside air flows into the pressure chamber through the through hole, so that the pressure chamber can be prevented from becoming negative pressure during intake. At the same time, the diaphragm operation can be prevented from reaching the valve stem. Further, even during normal times, the diaphragm is not affected by the distortion of the diaphragm, and the valve body can be maintained in an appropriate posture to maintain reliable water stoppage.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part showing an air valve in an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of the air valve.
FIG. 3 is a cross-sectional view showing an example of a conventional air valve.
FIG. 4 is a cross-sectional view of a main part of the air valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Valve box 10 Large air hole 11 Strut bolt 12 Spring box 13 Lid 14 Diaphragm 14c Nut 14d Through hole 14e Inner peripheral edge 15a Pressure chamber 15b Spring chamber 15c Spring 16 Communication hole 17 Micro hole 19 Valve rod 19a Small air hole 19b Small diameter part 24 Diaphragm receiving part 25 Sleeve

Claims (1)

A large air hole is formed in the upper part of the valve box, a diaphragm is provided above the large air hole, a pressure chamber communicating with the atmosphere through the minute hole is provided, and the valve rod is disposed through the large air hole. A valve body that opens and closes a large air hole is provided at the lower end of the valve body, a small air hole that connects the pressure chamber and the space inside the valve box is formed in the valve rod, and a shaft that opens and closes the small air hole is installed in the lower part of the valve body. In an air valve that is movably connected to the shaft and has a float on the shaft,
An exhaust structure for an air valve, characterized in that a through hole for inserting the valve rod is formed in the diaphragm, and a diaphragm receiving portion that is in contact with and separated from the inner peripheral edge of the through hole is provided on the valve rod so as to face the lower surface of the diaphragm. .

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