JP4301745B2 - Air valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air valve and relates to a technique for discharging air in a sewage pipe.
[0002]
[Prior art]
As this type of air valve, there is one shown in FIGS. This air valve has a flange portion 1 for connection to the sewage pipe A at the lower part, a valve seat 4 for forming an exhaust hole 3 is provided in the upper cover 2, and the upper cover 2 is fixed to the valve box 5. . The valve body 6 that opens and closes the exhaust hole 3 has an upper end portion of the valve shaft portion 6a passing through the diaphragm 7. The diaphragm 7 has a cover member 8 having a pressure release hole 8a to the atmosphere and a spring box having an air release hole 9a. 9, a pressure chamber 11 is formed so as to communicate with the inside of the valve box 5 through a small diameter air hole 10 penetrating the valve shaft portion 6 a.
[0003]
A diaphragm pressing plate 12 is disposed below the diaphragm 7, and a spring 13 that presses the diaphragm pressing plate 12 toward the diaphragm 7 is disposed inside the spring box 9. The valve shaft portion 6a is provided with a pair of nuts 15 that fasten and fix the diaphragm pressing plate 12 to the valve shaft portion 6a via a metal collar.
[0004]
A float 16 that moves up and down according to the fluctuation of the liquid level and presses the valve element 6 in the closing direction by buoyancy is disposed inside the valve box 5. A shaft 17 that supports the float 16 engages with a snap pin 19 of the valve body 6 in a long hole 18, and is provided so as to be movable relative to the valve body 6 within a certain range in the vertical direction. The small diameter air hole 10 is opened and closed by abutting and separating 17a from the air hole valve seat 10a.
[0005]
A splash shield 20 is disposed below the upper cover 2. A splash hole 20 is formed in the splash shield 20, and a strainer 21 is attached above the vent hole 20 a. A predetermined opening (not shown) is formed in the protective cover 22 arranged to cover the upper part of the exhaust hole 3.
[0006]
The operation of the air valve having the above configuration will be described. When the pipe A is filled with water, the float 16 and the valve body 6 move downward, and the exhaust hole 3 is opened. Therefore, a large amount of air in the pipe A is exhausted to the outside through the exhaust hole 3 of the valve box 5.
[0007]
When the water filling progresses and the water level inside the valve box 5 rises, as shown in FIG. 3, buoyancy is applied to the float 16 and the float 16 moves up, and the shaft 17 moves to the air hole valve seat 10a at the upper end surface 17a. To close the small diameter air hole 10 and push up the valve body 6, and the valve body 6 closes the exhaust hole 3.
[0008]
When the water in the liquid flowing through the pipe A flows into the valve box 5 and accumulates inside after the completion of the filling, the liquid level is lowered, and the float 16 is moved down by the liquid level being lowered. Along with this, as shown in FIG. 4, the shaft 17 also moves down together, and its upper end surface 17a is separated from the air hole valve seat 10a to open the small diameter air hole 10. By opening the small-diameter air hole 10, the internal pressure of the valve box 5 acts on the pressure chamber 11 through the small-diameter air hole 10, and a downward force acts on the valve body 6 through the diaphragm 7.
[0009]
For this reason, a downward force acting via the diaphragm 7 and an upward force acting due to the internal pressure of the valve box 5 act on the valve body 6, and as shown in FIG. 6 and the weight of the float 16 push down the valve body 6, and a large amount of air accumulated in the valve box 5 is discharged through the exhaust hole 3.
[0010]
As the air is discharged, the water level inside the valve box 5 rises, and when the float 16 moves upward, the shaft 17 closes the small-diameter air hole 10 at the upper end surface 17a and pushes up the valve body 6. The valve body 6 closes the exhaust hole 3 by closing and pushes up the diaphragm 7, and the air accumulated in the pressure chamber 11 is discharged through the pressure release hole 8a.
[0011]
[Problems to be solved by the invention]
By the way, when assembling, when the diaphragm pressing plate 12 is fastened to the valve shaft portion 6a with the nut 15 through the metal collar 14, or when the nut 15 is removed during maintenance, the valve body 6 and the valve shaft portion 6a are connected to the nut 15. At the same time, it takes time to disassemble and assemble, and when the nut 15 is not sufficiently tightened, the nut 15 is loosened during use.
[0012]
The present invention solves the above-described problems, and an object of the present invention is to provide an air valve that can easily disassemble and assemble the air valve and prevent the nut from loosening.
[0013]
[Means for Solving the Problems]
In order to solve the above-described problem, an air valve of the present invention according to claim 1 includes a valve box, a valve body that opens and closes an exhaust hole of the valve box, a diaphragm that forms a pressure chamber, and a lower side of the diaphragm. a diaphragm presser plate located, the valve shaft portion disposed through a spring presses the diaphragm holding plate to the diaphragm, and a diaphragm presser plate and the diaphragm there below the diaphragm pressing plate, the elastic in the valve shaft portion It has an elastic contraction force that can be temporarily fixed to the diaphragm pressing plate against the pressing force of the spring during assembly by mounting it with a contraction force. a collar made of wood, the color was attached to the valve shaft portion, the diaphragm pressing plate presses the collar is screwed attached to the valve shaft portion in the axial direction to the valve shaft portion Those having a constant nut.
[0014]
With the above configuration, the collar is made of an elastic material and is fixed to the valve stem portion by its elastic contraction force. Therefore, when assembling, the diaphragm presser plate can be resisted against the pressing force of the spring by simply attaching the collar to the valve stem portion. It can be temporarily fixed, and the mounting operation can be easily performed by mounting the nut to the valve shaft portion in this state.
[0015]
By gripping the collar when tightening the nut, it is possible to prevent the valve shaft part and the valve body from rotating by the frictional force of the collar. Can be tightened to the valve stem.
[0016]
When the nut is tightened, the collar compresses and deforms, and the elastic restoring force increases the frictional force between the collar and the nut, preventing the nut from loosening. The collar absorbs by its spring effect and can prevent the nut from loosening.
[0017]
The air valve of the present invention according to claim 2 is provided with a second collar made of an elastic material at the tip of the valve stem portion so that the collar is mounted at the time of assembly, and then the nut is mounted, and the nut is sandwiched between the collar and the top and bottom. The nut is mounted with elastic contraction force and the nut is loosened with a second collar.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Since the basic configuration of the air valve in the present embodiment is the same as that shown in FIGS. 2 to 5, members that perform the same action are denoted by the same reference numerals and description thereof is omitted.
[0019]
In FIG. 1, a diaphragm pressing plate 12 is disposed below the diaphragm 7 interposed between the spring box 9 and the lid member 8, and 13 disposed in the spring box 9 connects the diaphragm pressing plate 12 to the diaphragm 7. Pressing toward.
[0020]
The valve shaft portion 6 a is disposed through the diaphragm pressing plate 12 and the diaphragm 7. A rubber collar 31 is attached to the valve shaft portion 6 a by its elastic contraction force, and the diaphragm pressing plate 12 is attached by the collar 31. Locked in the axial direction.
[0021]
A nut 32 is arranged on the upper portion of the collar 31 so as to be screwed to the valve shaft portion 6a. The nut 32 presses the collar 31 in the axial direction to fix the diaphragm pressing plate 12 to the valve shaft portion 6a. A rubber second collar 33 is attached to the tip of the valve shaft portion 6a with elastic contraction force. The collar 31 and the second collar 33 are formed to have a smaller diameter than the valve shaft portion 6a.
[0022]
Hereinafter, the operation of the above-described configuration will be described. Since the rubber collar 31 can be fixed to the valve shaft portion 6a by its elastic contraction force, the diaphragm pressing plate 12 resists the pressing force of the spring 13 only by mounting the collar 31 on the valve shaft portion 6a during assembly. Can be temporarily fixed. Therefore, by attaching the nut 32 to the valve shaft portion 6a in this state, the attaching operation can be easily performed.
[0023]
When the nut 32 is tightened, the valve shaft portion 6a and the valve body 6 can be prevented from rotating by the frictional force of the collar 32 by grasping the collar 31. In this state, the valve shaft portion 6a and the valve body 6 rotate together. The nut 32 can be sufficiently tightened to the valve shaft portion 6a while preventing the above-described problem.
[0024]
When the nut 32 is tightened, the collar 31 is compressed and deformed in the axial direction, and the elastic restoring force increases the frictional force at the contact surface between the collar 31 and the nut 32. Therefore, the nut 31 can be prevented from loosening with this frictional force. it can. Further, even if the valve shaft portion 6a vibrates during operation of the valve body 6, the collar 31 absorbs the vibration by the spring effect, so that the nut 32 can be prevented from loosening. Furthermore, the nut 32 can be reliably prevented from loosening by the second collar 33.
[0025]
【The invention's effect】
As described above, according to the present invention, the collar made of an elastic material is fixed to the valve shaft portion by its elastic contraction force, and the diaphragm pressing plate is temporarily fixed against the pressing force of the spring by the collar during assembly. The nut can be easily attached to the valve stem, and the collar can be grasped when tightening the nut, and the nut can be fully tightened to the valve stem while preventing the valve stem and valve body from rotating by the friction force. By tightening the nut, the collar is compressed and deformed, and the elastic restoring force increases the frictional force between the collar and the nut to prevent the nut from loosening, and the vibration during operation is absorbed by the spring effect of the collar to loosen the nut. Can be prevented. The nut can be reliably prevented from rotating with the second collar attached to the tip of the valve shaft portion.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a main part of an air valve in an embodiment of the present invention.
FIG. 2 is an overall longitudinal sectional view of a conventional air valve.
FIG. 3 is an enlarged vertical sectional view showing a main part of the operation of a conventional air valve.
FIG. 4 is an enlarged longitudinal sectional view showing a main part of the operation of a conventional air valve.
FIG. 5 is an enlarged longitudinal sectional view showing a main part of the operation of a conventional air valve.
[Explanation of symbols]
A Sewage piping 1 Connecting flange 2 Upper cover 3 Exhaust hole 4 Valve seat 5 Valve box 6 Valve body 6a Valve shaft portion 7 Diaphragm 8 Lid member 8a Pressure release hole 9 Spring box 9a Air release hole 10 Small diameter air hole 10a Air Hole valve seat 11 Pressure chamber 12 Diaphragm holding plate 13 Spring 16 Float 17 Shaft 17a Upper end surface 18 Long hole 19 Snap pin 20 Splash repellent 20a Vent 21 Strainer 22 Protective cover 31 Collar 32 Nut 33 Second collar

Claims (2)

A valve box, a valve body that opens and closes an exhaust hole of the valve box, a diaphragm that forms a pressure chamber, a diaphragm pressing plate that is disposed below the diaphragm, and a diaphragm pressing plate that is below the diaphragm pressing plate to the diaphragm A spring that presses toward the valve, a valve shaft part that passes through the diaphragm pressing plate and the diaphragm, and an elastic contraction force attached to the valve shaft part to temporarily hold the diaphragm pressing plate against the pressing force of the spring during assembly A collar made of an elastic material that has an elastic contraction force that can be retained and that prevents the valve stem portion from rotating by friction when grabbed during assembly, and after the collar is mounted on the valve stem portion, An air valve characterized by comprising a nut for mounting and fixing a diaphragm pressing plate to a valve shaft portion by pressing a collar in an axial direction. Attach the collar at the time of assembly, then attach the nut, and then attach the second collar made of elastic material to the tip of the valve shaft part with elastic contraction force so that the nut is sandwiched between the collar and the upper and lower. The air valve according to claim 1, wherein the nut is loosened.

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