JP3080848B2 - Air valve seat mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust port, a valve seat provided at an opening edge of the exhaust port, and a valve body which opens and closes the exhaust port in contact with or separated from the valve seat. And a valve seat mounting structure for an air valve having:

[0002]

2. Description of the Related Art A conventional valve seat mounting structure for an air valve is disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 64-25581. That is, a vent is formed in the valve box, a first enlarged step is formed at the opening edge of the vent, and a second enlarged step is formed at the opening edge of the first enlarged step. Is formed. A valve seat is fitted into the second enlarged diameter step, and a pressing member is fitted into the first enlarged diameter step by interference fit. Each of the valve seat and the holding member is formed with an engaging portion that locks in the direction in which the valve seat comes out.

[0003] According to this, the valve seat engages with the pressing member which is fitted to the first enlarged-diameter step portion through the engaging portion.
It is securely retained.

[0004]

However, in the above-mentioned conventional type, the first enlarged diameter step portion and the second enlarged diameter step portion are formed by machining, but the first enlarged diameter step portion at the time of machining is formed. And the second
It was necessary to finish the dimensions with the enlarged diameter step with high precision. Therefore, processing is troublesome, and the cost is increased.
In particular, when the valve box and the holding member are made of cast iron, it is necessary to apply the coating to the first enlarged step and the second enlarged step. Therefore, the first enlarged step and the second enlarged step are required. It was difficult to ensure dimensional accuracy with the part. Further, since a holding member is required for mounting the valve seat, the number of parts is increased, and the mounting is troublesome.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems and to provide an air valve seat mounting structure which can be easily mounted and can be mounted even if the dimensional accuracy of the enlarged diameter step portion is coarse. is there.

[0006]

According to a first aspect of the present invention, there is provided a valve seat mounting structure for an air valve, comprising: an exhaust hole formed in a valve box; and an annular hole provided at an opening edge of the exhaust hole. And a valve body that opens and closes an exhaust hole by contacting and separating from the valve seat, and an annular enlarged step portion for fitting the valve seat to an opening edge of the exhaust hole. The above-mentioned valve seat is formed so as to be press-fittable into the enlarged diameter step portion, and the above-mentioned valve seat is annular.
Elastic body, and inserted into the elastic body in the circumferential direction
The outer diameter of the enlarged diameter step portion is determined by the valve seat
Is formed smaller than the outer diameter of the valve seat as long as
Is what it is.

In the valve seat mounting structure for an air valve according to the second aspect of the present invention , a rubber member is used as an elastic body, and a core material is made of metal.
There is something.

[0008]

According to the configuration of the first aspect of the present invention, the valve seat is moved to the step of increasing the diameter.
The elastic body of the valve seat is compressed in the radial direction when
With this, the valve seat is securely held in the enlarged diameter step
You. Therefore, the outside diameter of the enlarged diameter step is within the range in which the valve seat can be pressed.
In this case, the diameter should be smaller than the outer diameter of the valve seat.
The dimensional accuracy of the step may be coarse, making it easy to process the enlarged diameter step
When installing the valve seat even when painting on the enlarged diameter step.
There is no title. Furthermore, by pressing the valve seat into the enlarged diameter step,
Because the elastic body of the valve seat is pressed against the step of increasing diameter,
Sufficient sealing performance with the enlarged diameter step is ensured. Also,
No special parts such as holding members are required for mounting the valve seat.
Therefore, the number of parts is reduced and the valve seat can be easily mounted.
I can.

[0009]

[0010]

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 2, a float chamber 2 is formed inside the valve box 1, and an exhaust hole 3 communicating with the float chamber 2 and the outside is formed at an upper part of the valve box 1, and at a lower part of the valve box 1. Is
An inflow hole 4 communicating with the float chamber 2 and the outside is formed. The float chamber 2 guides the vertically movable floating valve body 5 that opens and closes the exhaust hole 3, the float 6 that urges the floating valve body 5 in the closing direction by buoyancy, and the lifting and lowering of the float 6. A guide tube 7 for receiving the float 6 at the lowest position is also provided.

A bottom flow port 8 is formed at the bottom of the guide tube 7, and an upper flow port 9 is formed at the top of the guide tube 7. The floating valve body 5 has a small air hole 10 that is closed by contact with the float 6.

As shown in FIG. 1, an annular enlarged step 13 for fitting the valve seat 12 is formed at the opening edge of the exhaust hole 3. The enlarged diameter step 13 has an outer peripheral surface 13a and an upper surface 13a.
b. As shown in FIGS. 1 and 3, the valve seat 12 includes an annular rubber member 15 which is an example of an elastic body, and a metal core member 16 which is inserted into the rubber member 15 in a circumferential direction. And are formed in an annular shape.
The cross section of the valve seat 12 has a square shape, and the cross section of the core member 16 is also formed in a square shape. The outer diameter d of the enlarged diameter step 13 is smaller than the outer diameter D of the valve seat 12 within a range in which the valve seat 12 can be press-fitted.

The operation of the above configuration will be described below.
As shown in FIG. 1, the rubber member 15 of the valve seat 12 is radially compressed by press-fitting the valve seat 12 into the enlarged diameter step portion 13, thereby expanding the valve seat 12 as shown in FIG. The stepped portion 13 is securely held by being stuck. Therefore, the outer diameter d of the expanded step 13
It is sufficient that the outer diameter D of the valve seat 12 is smaller than the outer diameter D of the valve seat 12 within a range where the valve seat 12 can be press-fitted. And the step of expanding diameter 13
There is no problem in mounting the valve seat 12 even if it is painted. Further, by press-fitting the valve seat 12 into the enlarged diameter step portion 13, the outer peripheral surface 15a of the rubber member 15 is pressed against the outer peripheral surface 13a of the enlarged diameter step portion 13 and the upper surface 15b of the rubber member 15 is Top of part 13
It is pressed against 13b. For this reason, the sealing performance between the valve seat 12 and the enlarged diameter step 13 is sufficiently ensured. In addition, since special components such as a holding member are not required for mounting the valve seat 12, the number of components is reduced, and the mounting of the valve seat 12 can be easily performed.

Thereafter, when a fluid such as sewage flows into the float chamber 2 from the inflow hole 4, the float 6 rises as the liquid level in the float chamber 2 rises, and as shown in FIG. The body 5 moves up and comes into contact with the lower surface of the valve seat 12, and the exhaust hole 3 is closed. Thereby, it is possible to prevent the fluid such as sewage from flowing out of the exhaust hole 3 to the outside.

When air flows into the float chamber 2 through the inflow hole 4 together with a fluid such as sewage, the float 6 descends as the liquid level in the float chamber 2 decreases. On this occasion,
Since the float 6 is separated from the floating valve body 5 downward, the small vent 10 is opened, and the pressure inside the float chamber 2 is released from the small vent 10 to the outside. Accordingly, the floating valve element 5 is also lowered, the exhaust hole 3 is opened as shown in FIG. 2, and the air in the float chamber 2 is exhausted through the upper circulation port 9 of the guide cylinder 7 as shown by the arrow A in FIG. Air is exhausted from the hole 3 to the outside.

In the above embodiment, as shown in FIG. 1, the rubber member 15 is used as an example of the elastic body of the valve seat 12. However, the elastic body is not limited to rubber but may be made of another material. Also,
The metal core 16 is inserted through the rubber member 15, but the core 16 is not limited to metal, and may be a resin having appropriate strength. Further, by using an elastic body having appropriate strength such as hard rubber, the core 16 may not be required. Further, although the cross section of the valve seat 12 is formed in a quadrangular shape, other shapes such as a polygonal shape and a circular shape may be used.

[0017]

As described above, according to the first aspect of the present invention, the valve seat is provided.
The elastic body of the valve seat is compressed in the radial direction when the
As a result, the valve seat can be securely inserted into the enlarged diameter step
Will be retained. Therefore, the outside diameter of the enlarged diameter step can press-fit the valve seat.
It is necessary only to be formed smaller than the outer diameter of the valve seat within the operable range.
For this reason, the dimensional accuracy of the enlarged diameter step may be coarse.
The valve seat can be removed even when painting on the enlarged diameter step.
There is no problem with the date. This reduces processing time and
It is possible to reduce costs. In addition, the valve seat
The elastic body of the valve seat is press-fitted into the step
Seal between the valve seat and the enlarged diameter step
Is sufficiently secured. Also, a holding member is used for mounting the valve seat.
No special parts such as
Reduction valve seat can be easily installed.

[0018]

[Brief description of the drawings]

FIG. 1 is a sectional view of a valve seat and an enlarged diameter step portion of an air valve according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing an open state of an air valve.

FIG. 3 is a plan view of a valve seat.

FIG. 4 is a cross-sectional view of a valve seat attached to a step of increasing diameter.

FIG. 5 is a sectional view showing a closed state of an air valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve box 3 Exhaust hole 5 Floating valve element 12 Valve seat 13 Expanding step 15 Rubber member (elastic body) 16 Core material d Outer diameter of expanding step D Outer diameter of valve seat

Claims (2)

(57) [Claims] An air having an exhaust hole in a valve box, an annular valve seat provided at an opening edge of the exhaust hole, and a valve body which comes into contact with and separates from the valve seat to open and close the exhaust hole. in the valve, the opening edge of the exhaust hole, to form a diameter step portion of the annular for Komu fitting the valve seat, pressed capable forming the valve seat diameter stepped portion, said valve seat, annular Elastic body and the inside of this elastic body
Formed by the core material inserted over
The outside diameter of the part is within the range where the valve seat can be pressed in.
A valve seat mounting structure for an air valve, characterized in that it is also formed small . 2. The valve seat mounting structure for an air valve according to claim 1 , wherein a rubber member is used as the elastic body, and the core material is made of metal .