JP2704973B2 - 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 for exhausting air from a pipe or the like into the atmosphere, and is particularly suitable for a pipe such as sewage that is not allowed to flow out.

[0002]

2. Description of the Related Art FIG. 3 is a cross-sectional view of a conventional air valve, and FIG. 4 is an enlarged cross-sectional view of a main part of the conventional air valve. As shown in FIG. 4, a float 2 and a floating valve 3 are provided in a valve box 1, and the valve box 1 is provided with a floating valve chamber 5, an exhaust chamber 6, and a pressure chamber 7 on a float chamber 4 in order. .

The float 2 of the float chamber 4 has a guide rod 9 extending upward from the center of the upper part of the float body 8, and this guide rod 9 is inserted into a central penetration hole 11 of a protective wall 10 provided at the upper part of the float chamber 4. A small hole valve seat 15 which penetrates up and down, has its tip end suspended in the lower part of the communication passage 13 so as to be able to move up and down via a pin 12, and has a small air hole 14 provided in the middle of the communication passage 13.
The valve is configured to open and close the valve in contact with or apart from the valve.

The floating valve 3 has a valve body 16 housed in the floating valve chamber 5 so as to be vertically movable, and opens an exhaust hole 17 provided at the bottom of the exhaust chamber 6 to release air in the float chamber 4 to the atmosphere. Is discharged inside. A valve stem 18 extends upward from the center of the valve body 16 of the floating valve 3, and a communication passage 13 penetrates through the center of the valve stem 18 to communicate between the floating valve chamber 5 and the pressure chamber 7. ing. This stem 18
Has a top end protruding into the pressure chamber 7, and a diaphragm 22 is sandwiched between two upper and lower washers 20, 21 fitted to the front end by a nut 19.

The pressure chamber 7 is partitioned by the diaphragm 22 and communicates with the atmosphere through a small exhaust hole 23.
An elastic body 24 made of a compression spring is provided below the diaphragm 22.
Are provided to urge the valve stem 18 upward.

Next, the operation of the above configuration will be described. When air flows into the float chamber 4 from the pipeline while the float chamber 4 is filled with water, the water level of the float chamber 4 decreases, and at the same time, the float 2 descends and a part of the air in the float chamber 4 is removed. It flows into the pressure chamber 7 via the communication passage 13 and acts on the diaphragm 22 to push down the valve stem 18 against the repulsive force of the elastic body 24. Therefore, the valve body 16 opens the exhaust hole 17, and the air in the float chamber 4 opens through the exhaust hole 17.
From 25 exhausted to the atmosphere.

When the water has flowed into the float chamber 4 after the exhaust is almost completed, the float 2 floats, and the guide rod 9 contacts the small hole valve seat 15 to close the small air hole 14. Therefore, air does not flow into the pressure chamber 7 and the internal pressure in the pressure chamber 7 becomes the atmospheric pressure, and the pushing force of the valve stem 18 acting on the diaphragm 22 is lost. Therefore, the valve body 16 rises due to the buoyancy of the float 2 and the restoring force of the elastic body 24 to close the exhaust hole 17. Thus, the sealing performance of the exhaust hole 17 is equal to that of the float 2
And the restoring force of the elastic body 24 are maintained. Even after the exhaust hole 17 is closed, the air in the float chamber 4 is compressed by the pressure in the pipeline and the liquid level rises (the liquid level L in FIG. 3). The protective wall 10 of the float chamber 4 blocks the splash scattered from the liquid surface of the fluid, and the strainers 27 provided in the plurality of air holes 26 of the protective wall 10 collect the dust scattered with the splash.

[0008]

In the conventional air valve, however, foreign matter is blocked by the protective wall 10 and the strainer 27, but this is not sufficient by itself, and foreign matter such as small dirt is removed from the small air hole 14. The air enters the pressure chamber 7 through the communication passage 13, and the small exhaust hole 23 of the pressure chamber 7 is clogged, thereby impairing the normal function of the air valve. That is, the small exhaust holes 23
If the air in the float chamber 4 remains trapped in the pressure chamber 7 due to the clogging, the diaphragm 22 continues to be pushed downward, and the floating valve 3 interlocked with the diaphragm 22 is opened to open the float chamber 4. There is a problem that water flows out of the opening 25 of the exhaust chamber 6.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide an air valve in which a small exhaust hole of a pressure chamber is not blocked by a foreign matter and a diaphragm functions normally. .

[0010]

According to the present invention, a floating valve chamber in which the valve element of a floating valve moves up and down is provided above a float chamber in which the float moves up and down, and the upper part of the floating valve chamber is communicated with an exhaust hole. In an air valve provided with an exhaust chamber to be opened and a pressure chamber partitioned by a diaphragm above the exhaust chamber, the floating valve is urged by an urging means to close the exhaust hole, and is opened by driving the diaphragm. Arranged to valve,
The float has a small air hole whose guide rod is loosely fitted in a communication passage formed through the floating valve, communicates the communication passage with the pressure chamber, and has a small air hole that is opened and closed by a tip of the float guide rod. A strainer is provided in a gap formed between the peripheral surface of the distal end portion of the guide rod and the inner peripheral wall of the communication passage of the floating valve in which the guide rod is loosely fitted.

[0011]

According to the present invention, foreign matter is prevented by disposing a strainer in a gap formed between the peripheral surface of the distal end portion of the guide rod of the float and the inner peripheral wall of the communication passage of the floating valve in which the guide rod is loosely fitted. It prevents entry into the pressure chamber through the communication passage, and prevents clogging of the small exhaust holes provided in the pressure chamber.

[0012]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged sectional view of an air valve according to one embodiment of the present invention. The air valve of this embodiment is provided with a float and a floating valve 32 in a valve box 31 similarly to the conventional air valve. A chamber 35 and an upper chamber 36 are provided.The upper chamber 36 is partitioned by a diaphragm 37, and a pressure chamber
Has 38.

The float chamber 33 has the same structure as that of the above-described conventional air valve, and has a fluid inlet hole at the bottom, and is arranged so that the float can be raised and lowered by inflow and outflow of water from the inlet hole. . The float has a guide rod 39 extending upward from the upper center of the float main body, and the guide rod 39 penetrates into a central penetration hole 41 of a protection wall 40 provided above the float chamber 33 so as to be able to ascend and descend. The distal end of 39 extends to the upper chamber 36.

An idle valve 32 is vertically movably arranged across three chambers, an idle valve chamber 34, an exhaust chamber 35, and an upper chamber 36. The valve body 43 of the floating valve 32 is vertically movably housed in the floating valve chamber 34, and the upper surface of the valve body 43 to which the packing 44 is attached abuts on the lower surface of the floating valve seat 45 and is located at the bottom of the exhaust chamber 35. The provided exhaust hole 46 is closed. And the valve element 43 is an idle valve seat.
Open the valve away from 45, and open the float chamber 33 from the opening 47 on the side wall.
The air inside is discharged to the atmosphere.

A valve stem 48 extends upward from the center of the valve element 43 of the floating valve 32, and a communication passage 49 which is sufficiently larger than the diameter of the guide rod 39 extends through the valve element 43 and the valve rod 48. The guide rod 39 is loosely fitted in the communication passage 49. A strainer 51 is disposed above a gap 50 between the guide rod 39 and the floating valve 32 to prevent foreign substances such as dust from entering the pressure chamber.

A diaphragm 37 is sandwiched between a flange 52 formed on the outer periphery of the upper part of the valve rod 48 of the floating valve 32 and a washer 53 fitted on the upper part of the valve rod 48, and a screw 54 is screwed on the upper part of the valve rod 48. The floating valve 32 is fixed to the diaphragm 37. This screw
A small hole valve seat 56 fitted with a rubber packing 55 is attached to the lower portion of the 53, and a small air hole 57 is formed through the small hole valve seat 56 and the screw 54 to communicate the communication passage 49 with the pressure chamber 38. doing. In addition, the tip of the guide rod 39 contacts the small hole valve seat 56 to close the small air hole 57, and the communication 49 between the communication passage 49 and the pressure chamber 38 is shut off.

A biasing means 58 composed of a compression spring is provided below the diaphragm 37, and biases the diaphragm 37 upward so that the valve element 43 of the floating valve 32 is lightly in contact with the floating valve seat 45.
The protective wall 40 of the float chamber 33 has a plurality of air holes 59,
A strainer 60 is provided in the air hole 59, and collects dust that is temporarily scattered with the splash.

Next, the operation of the above configuration will be described.
First, when the float chamber 33 is filled with water, the floating valve
The valve body 43 of 32 closes the exhaust hole 46, and the tip of the guide rod 39 of the float comes into contact with the small hole valve seat 56 to close the small air hole 57, so that the valve is closed. Then, when air flows into the float chamber 33, the water surface in the float chamber 33 goes down, and as the water surface goes down, the float also goes down. As a result, the tip of the float separates from the small-hole valve seat, and a small air hole 57 is opened.
4. The fluid flows into the pressure chamber 38 via the communication passage 49 and the small air hole 57. The air flowing into the pressure chamber 38 acts on the diaphragm 37 to push down the valve rod 48. Therefore, the valve body 43 is
35 exhaust holes 46 are opened, and the air in the float chamber 33 is
The air is exhausted at a stretch from the opening 47 via.

When the water is exhausted at once and the water surface in the float chamber 33 rises, the float floats up, the guide rod 39 comes into contact with the small hole valve seat 56, and the small air hole 57 is closed. At this time, the water level may rise vigorously and water may enter the pressure chamber 38 from the communication passage 49, but the small air hole 57 of the small hole valve seat 56 is
Since it is located higher, the rise of water is stopped at the communication passage 49 and is prevented from flowing into the pressure chamber 38. However, the water that has risen up the communication passage 49 without being prevented completely
To prevent foreign matter in the water from entering the pressure chamber 38.

When the small air hole 57 is closed and the air does not flow into the pressure chamber 38 and the pushing force of the valve rod 48 acting on the diaphragm 37 is lost, the valve body 43 causes the buoyancy of the float and the urging means. It rises by the restoring force of 58 and closes the exhaust hole 46.
The sealing performance of the exhaust hole 46 depends on the buoyancy of the float and the urging means 58.
The resilience of both is maintained.

Next, as the air in the pipeline flows into the float chamber 33 and the liquid level falls, the float descends, and the tip of the guide rod 39 separates from the small hole valve seat 56 and the small air hole 57. Is opened, and the air in the floating valve chamber 34 flows into the pressure chamber 38 through the communication passage 49. At this time, since the area of the diaphragm 37 is larger than the area of the upper surface of the valve body 43 surrounded by the packing 44, the pressure acting on the diaphragm 37 causes the air pressure to push the valve body 43 upward, and the urging means 58. Overcoming the repulsion force, depresses the valve stem 48 to open the exhaust hole. When the exhaust hole 46 is opened and the air in the floating valve chamber 34 is exhausted into the atmosphere, the pressure in the float chamber 33 decreases and the water level rises.

In the above embodiment, the strainer 51 is disposed without gap in the upper gap 50 between the guide rod 39 and the communication passage 49. However, as shown in FIG. A tapered strainer 62 may be provided. The tapered strainer 62 is formed in a thin plate shape as compared with the strainer 51 of the above embodiment, the upper end edge is fixed to the inner wall of the valve rod 48, and the lower end edge is provided with a sliding portion 63 to guide the guide rod. It is configured to be slidable with respect to the vertical movement of 39. By making the strainer 62 thin as described above, the resistance of the air passing through the communication passage 49 can be reduced, and the diaphragm
37 delays can be prevented.

[0023]

As described above, according to the present invention, the strainer is provided in the gap formed between the distal end peripheral surface of the float guide rod and the inner peripheral wall of the communication passage of the floating valve in which the guide rod is loosely fitted. This prevents foreign matter from entering the pressure chamber through the communication hole, prevents the small exhaust hole provided in the pressure chamber from being clogged, and allows the diaphragm to operate normally to prevent the air valve from opening. Prevent water from spilling.

[Brief description of the drawings]

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

FIG. 2 is a partial sectional view of an air valve according to another embodiment of the present invention.

FIG. 3 is a sectional view showing an example of a conventional air valve.

FIG. 4 is an enlarged sectional view showing a main part of a conventional air valve.

[Explanation of symbols]

 32 Floating valve 33 Float chamber 34 Floating valve chamber 35 Exhaust chamber 37 Diaphragm 38 Pressure chamber 39 Guide rod 43 Valve body 46 Exhaust hole 49 Communication passage 51 Strainer 57 Small air hole 58 Biasing means 62 Strainer

Claims (1)

(57) [Claims] A floating valve chamber in which a valve element of the floating valve moves up and down; an exhaust chamber communicating with an exhaust hole through an exhaust hole is provided above the floating valve chamber; In an air valve provided with a pressure chamber partitioned by a diaphragm at the upper part of the chamber, the floating valve is arranged to be urged by urging means to close an exhaust hole and to be opened by driving of the diaphragm, The float has a small air hole whose guide rod is loosely fitted in a communication passage formed through the floating valve, communicates the communication passage with the pressure chamber, and has a small air hole which is opened and closed by the tip of the float guide rod. An air valve, wherein a strainer is disposed in a gap formed between a peripheral surface of a tip end portion of a rod and an inner peripheral wall of a communication passage of a floating valve in which the guide rod is loosely fitted.