JP2000035146A - Ball type check valve and manufacture of ball - Google Patents

Abstract

PROBLEM TO BE SOLVED: To previously prevent the occurrence of damage in a piping system by providing a main body part for holding and housing a core member and a cover part to be fixed to the main body part. SOLUTION: A ball 3 to be housed in a valve chamber 16 is formed of a spherical metal ball 12 as a core member and a cover rubber 11. Outer diameter of the metal ball 12 is formed smaller than the width of a ball guide 4, and outer diameter of the whole of the ball 3 including the cover rubber 11 is formed larger than the width of the ball guide 4. The cover rubber 11 is formed of a body part for covering an area larger than 1/2 of the whole surface area of the metal ball 12 and a cover part 22 to be fixed to the body part at a fixing surface 23. The fixing surface 23 is formed in parallel with the virtual center surface passing through the center of the metal ball 12, and positioned at a position separated from the center surface by the predetermined distance. The fixing surface 23 is formed into a surface displaced from the center surface, and it dose not pass through the center of the metal ball 12. The body part is formed into a shape for securely holding the metal ball 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball check valve and a method of manufacturing a ball provided in the ball check valve, and more particularly to a ball check valve suitable for an apparatus related to sewage treatment. About.

[0002]

2. Description of the Related Art Conventionally, a ball type check valve is often used as a check valve for preventing a backflow of a fluid. As shown in FIG. 7, the ball-type check valve includes a ball 100 movably accommodated in the valve box 1, and the ball 100 serves as a valve body to prevent the backflow of fluid. Specifically, when the fluid tries to flow in the forward direction (the direction A in the figure), the ball 100 receives the pressure of the fluid and the ball guide 4
To the opening position indicated by the solid line. As a result, the circulation port 8 is opened, and the fluid flows from the inflow port 6 to the outflow port 7. On the other hand, when the fluid tries to flow in the opposite direction (the direction B in the drawing), the ball 100 receives the pressure of the fluid and moves to the closed position indicated by the imaginary line along the ball guide 4.
As a result, the flow port 8 is closed, and the flow of the fluid is blocked.

In general, a ball serving as a valve body is formed of a metal ball. However, when the ball type check valve is used in a device related to sewage treatment, the surface of the metal ball may be corroded, so that the surface of the metal ball is often covered with corrosion-resistant rubber. That is, the ball 100 is often composed of a metal ball 101 serving as a core metal and a covering rubber 102 covering the metal ball 101.

As shown in FIG. 8, conventionally, a covering rubber 102 covering a metal ball 101 is formed by a half shell 103 of a spherical shell.
104 were adhered to each other. by the way,
Solid matter such as garbage may be mixed in the sewage. For this reason, the half bodies 103 and 104 may be separated from the bonding surface and separated by a collision between the solid material and the ball 100 or the like. At this time, the separated halves 103 and 104 are easily peeled off from the metal ball 101 because the halves 103 and 104 are adhered on a surface passing through the center of the metal ball 101. As a result, the metal ball 101 may jump out of the valve box 1 and damage the piping system.

Therefore, in order to prevent the metal ball 101 from jumping out of the valve box 1, see Japanese Utility Model Application Laid-Open No. 63-1586.
No. 56 discloses that the outer diameter of the metal ball 101 is made larger than the width of the ball guide 4,
It is proposed that the metal ball 101 itself does not protrude from the valve box 1 even if the metal ball 101 comes off the bonding surface.

[0006]

However, in the ball-type check valve disclosed in the above publication, the weight of the ball 100 is increased due to the larger outer diameter of the metal ball 101.
For this reason, it has been difficult for the ball 100 to move smoothly in the valve box 1. In particular, when the flow rate is small, the ball 100 is hard to move to the opening position, and the flow of the fluid in the forward direction may be hindered.

Therefore, there has been a demand for a ball check valve which prevents the metal ball 101 from jumping out of the valve box 1 without being restricted by the size of the metal ball 101.

[0008] The present invention has been made in view of such a point, and an object of the present invention is to provide a method for manufacturing a metal ball having an outer diameter smaller than the width of a ball guide. An object of the present invention is to provide a ball type check valve which does not fly out of a valve box and can prevent damage to a piping system.

[0009]

Means for Solving the Problems In order to achieve the above object, a first aspect of the present invention is to provide a valve housing a ball comprising a core member and an elastic body covering the core member. In the ball-type check valve, the elastic body includes a main body that accommodates and holds the core member so as to cover an area larger than １ ／ of a total surface area of the core member, and an opening of the main body. And a lid fixed to the main body.

According to the above, even if the lid is peeled off from the main body, the main body is 1/1 of the total surface area of the core member.
Since the core member covers an area larger than 2, the core member is securely received and held in the main body, and the main body does not come off from the core member. Therefore, the core member is prevented from jumping out of the valve box, and damage to the piping system is prevented.

According to a second aspect of the present invention, there is provided a ball check valve in which a ball formed of a core member and an elastic member covering the core member is accommodated in a valve box. That is what has been done.

According to the above, since the elastic body is integrally formed, there is no seam. Therefore, the elastic body is prevented from being separated by wear or vibration, and the elastic body is not peeled off from the core member. Therefore, the core member is prevented from jumping out of the valve box, and damage to the piping system is prevented.

According to a third aspect of the present invention, in the first or second aspect, the outer diameter of the core member is smaller than the width of the ball guide.

According to the above-mentioned matter, since the diameter of the core member is small, the weight of the ball is reduced. Therefore, the opening / closing operation of the ball type check valve is performed smoothly.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a ball provided on a ball type check valve, comprising a core member and an elastic body covering the core member. Forming a first elastic member accommodating the core member so as to cover an area larger than 1/2 of the core member, and a second elastic member covering the entire surface of the core member together with the first elastic member; The method includes a step of packing the core member in the first elastic member and a step of fixing the second elastic member to the first elastic member so as to cover the core member.

According to the above, the core member is packed in the first elastic member, and then the second elastic member is fixed to the first elastic member, so that the center of the core member and the center of the ball are easily aligned. That is, the ball is less likely to be eccentric. Therefore, it is possible to accurately manufacture a ball in which the elastic body is not easily separated from the core member.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a ball provided in a ball type check valve, comprising a core member and an elastic body covering the core member. The method includes a step of winding the body material and a step of subsequently vulcanizing the elastic body material.

According to the above, the elastic body can be integrally formed by a simple process of simply winding the elastic body material around the core member and vulcanizing it.

[0019]

Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description,
The same parts as those of the conventional ball type check valve are denoted by the same reference numerals.

First, the configuration of the ball check valve according to the present embodiment will be described.

As shown in FIGS. 1 and 2, a lower casing 13 is provided at a lower end of the valve box 1, and an upper casing 14 is provided at an upper end of the valve box 1. An inflow port 6 is formed in the center of the lower casing 13. The outlet 7 is formed in the center of the upper casing 14. The inflow port 6 and the outflow port 7 are communicated by a flow passage 15 extending in the vertical direction. A valve chamber 1 that movably accommodates a ball 3 as a valve body is provided at the center of the flow passage 15.
6 are formed. As shown in FIG. 1, the valve chamber 16 has an arcuate cross-sectional shape. Below the valve chamber 16,
A conical band-shaped valve seat 5 is provided, and a flow port 8 is provided inside the valve seat 5.
Are formed. Above the valve chamber 16 is a rear side (FIG. 1).
A pair of ball guides 4 is formed to be curved from the side wall (left side) to the upper wall (see FIG. 2). The front side (the right side shown in FIG. 1) of the valve box 1 is closed by a lid 2. The lid 2 is attached to the valve box 1 by bolts (not shown). An O-ring 9 for sealing the inside of the valve box 1 in a watertight manner is provided between the lid 2 and the valve box 1. This lid 2
Is configured to be opened and closed when the ball 3 is accommodated in the valve chamber 16 and maintenance is performed.

The ball 3 which is a feature of the present embodiment is accommodated in the valve chamber 16. The ball 3 includes a spherical metal ball 12 as a core member and a metal ball 1
2 and a covering rubber 11 as an elastic body covering the covering 2. As shown in FIG. 2, the outer diameter of the metal ball 12 is smaller than the width W of the ball guide 4, and the entire outer diameter of the ball 3 including the covering rubber 11 is larger than the width W of the ball guide 4.

As shown in FIG. 3, the covering rubber 11 is composed of a main body 21 covering an area larger than half of the total surface area of the metal ball 12, and a lid portion fixed to the main body 21 at the fixing surface 23. 22. The fixing surface 23
It is parallel to an imaginary center plane 24 passing through the center of the metal ball 12 and is located at a predetermined distance from the center plane 24. That is, the fixing surface 23 is shifted from the center surface 24 and does not pass through the center of the metal ball 12. As described above, the main body 21 is provided with the metal ball 12.
So that the metal ball 12 is housed and held so as to securely hold the metal ball 12.

Next, a method of manufacturing the ball 3 of the ball type check valve according to the present embodiment will be described with reference to the flowchart of FIG.

First, in step ST1, the main unit 2
1 and a mold for manufacturing the lid 22 are manufactured. Next, in step ST2, a rubber molded product of the main body 21 and the lid 22 is manufactured from the rubber raw material using the mold. In step ST3, the metal balls 12
To manufacture. After the rubber molded product of the main body 21 and the lid 22 and the metal ball 12 are manufactured, step S
Proceeding to T4, the metal balls 12 are packed inside the rubber molded product (first elastic member) of the main body 21. Thereafter, the process proceeds to step ST5, in which the rubber molded product (second elastic member) of the lid portion 22 is put on the rubber molded product of the main body portion 21 packed with the metal balls 12, and they are bonded. And step S
Proceeding to T6, the rubber molded product of the main body 21 and the lid 22 is vulcanized.

Next, the operation of the ball type check valve will be described.
When the fluid is supplied from the inflow port 6 in the forward direction (A direction shown in FIG. 1), the ball 3 is separated from the valve seat 5 by the pressure of the fluid. Then, the ball 3 is moved along the ball guide 4 into the lid 2.
Move to the side opening position. As a result, the circulation port 8 is opened, and the fluid flowing from the inflow port 6 flows out of the outflow port 7.

On the other hand, when the supply of the fluid is stopped, the ball 3 moves below the valve chamber 16 by its own weight and is positioned on the valve seat 5 so as to close the flow opening 8. Thereby, the backflow of the fluid is prevented. When the fluid is supplied from the outlet 7, the pressure of the fluid in addition to the weight of the ball 3 causes
The ball 3 moves downward, and the distribution port 8 is closed. As a result, backflow is prevented.

As described above, according to the ball type check valve of the present embodiment, the rubber cover 11 of the ball 3 has the main body 21 covering an area larger than １ ／ of the total surface area of the metal ball 12. And a lid portion 22 fixed to the main body portion 21. Since the fixing surfaces 23 thereof are displaced from a surface passing through the center of the metal ball 12, even if the main body portion 21 and the lid portion 22 are fixed to each other, Even if it is separated from 23, the metal ball 12 does not protrude from the main body 21. In other words, since the metal balls 12 are packed in the main body 21, they are firmly fixed to the main body 21, and
Is not peeled off from the metal ball 12. Therefore,
Even when used in an apparatus related to sewage treatment, the metal balls 12 do not flow out downstream, so that damage to the piping system can be prevented.

In the present embodiment, since the outer diameter of the metal ball 12 is smaller than the width of the ball guide 4, the metal ball 12 is relatively light. Therefore, since the ball 3 itself is also lightweight, even if the pressure of the fluid is small, the opening and closing of the circulation port 8 can be performed smoothly. Therefore, the performance of the check valve is higher than that of a conventional ball check valve in which the outer diameter of the metal ball 12 is larger than the width of the ball guide 4.

In this embodiment, after the rubber molded product of the main body 21 and the lid 22 is manufactured in advance, the metal ball 12 is packed in the rubber molded product of the main body 21. Of the ball 3 and the center of the ball 3 itself easily. Therefore, the center of the ball 3 can be easily matched with the center of gravity, and the ball 3 smoothly rotates. Therefore, the opening and closing of the valve is performed smoothly. Further, since the amount of eccentricity is small, wear of the ball 3 is reduced. Therefore, the service life of the check valve can be prolonged.

[0031]

Second Embodiment A ball type check valve according to a second embodiment is obtained by integrally molding a rubber cover 11 of a ball. Except for the ball, it is the same as the ball-type check valve of the first embodiment, and therefore, only the ball will be described here.

As shown in FIG. 5, the ball 25 according to the present embodiment comprises a metal ball 12 and a covering rubber 11 which covers the metal ball 12, but unlike the first embodiment, the ball 25 The covering rubber 11 has no adhesive surface. In other words, the covering rubber 11 has no joint and is integrally formed. The outer diameter of the metal ball 12 is the same as that of the ball 3 of the first embodiment.
And the outer diameter of the ball 25 itself is larger than the width of the ball guide 4.

With reference to FIG. 6, a method of manufacturing the ball 25 according to this embodiment will be described. First, step ST1
In 1, a band-shaped rubber material (elastic material) is formed. In step ST12, the metal ball 1
2 is manufactured. Next, the process proceeds to step ST13, in which a belt-like rubber material is wound around the metal ball 12. Then, in step ST14, the rubber material is vulcanized while being pressed. As a result, a seamless ball 25 is obtained on the coated rubber 11 as shown in FIG.

According to the ball type check valve of the present embodiment, since the covering rubber 11 is integrally formed, the covering rubber 11 does not separate. Therefore, the metal ball 12 does not peel off from the covering rubber 11 and jump out of the valve box 1. Therefore, even when used in an apparatus related to sewage treatment, it is possible to prevent damage to the piping system.

Further, the ball 25 can be easily manufactured by winding a belt-like rubber material around the metal ball 12 and vulcanizing the rubber material. Therefore, the ball check valve can be manufactured at low cost.

[0036]

As described above, according to the first aspect of the present invention, the elastic body is formed by the main body and the cover covering an area larger than 1/2 of the total surface area of the core member.
Even when the main body and the lid are separated,
The core member is firmly held by the main body, and can prevent the core member from jumping out of the valve box. Therefore,
Damage to the piping system can be prevented beforehand.

According to the second aspect, since the elastic body covering the core member is integrally formed, the elastic body has no fixing surface. Therefore, separation of the elastic body can be avoided, and the core member can be prevented from jumping out of the valve box. Accordingly, damage to the piping system can be prevented.

According to the third aspect, since the outer diameter of the core member is smaller than the width of the ball guide, the weight of the ball can be reduced. Therefore, the opening and closing operation of the check valve can be performed smoothly.

According to the fourth aspect, the core member is packed in the first elastic member, and then the second elastic member is fixed to the first elastic member. Therefore, the center of the ball and the center of gravity coincide with each other. It becomes easier. That is, the ball is less likely to be eccentric. Therefore, it is possible to accurately manufacture a ball in which the elastic body is not easily separated from the core member. As a result, the movement of the ball as the valve element is performed smoothly. Further, the ball is less likely to be worn, and the life of the ball type check valve can be extended.

According to the fifth aspect, the elastic material is wound around the entire surface of the core member, and then the elastic material is vulcanized. Therefore, the elastic material can be integrally formed by a simple method. it can.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a ball type check valve.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an exploded perspective view of the ball according to the first embodiment.

FIG. 4 is a flowchart showing a ball manufacturing process according to the first embodiment.

FIG. 5 is a front view of a ball according to a second embodiment.

FIG. 6 is a flowchart showing a ball manufacturing process according to the second embodiment.

FIG. 7 is a longitudinal sectional view of a conventional ball check valve.

FIG. 8 is a front view of a conventional ball.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 valve box 2 lid 3 ball 4 ball guide 5 valve seat 6 inflow port 7 outflow port 11 coated rubber (elastic body) 12 metal ball (core member) 21 main body (first elastic member) 22 lid (second elasticity) 23) Fixing surface

Continued on the front page. (72) Inventor ▲ Kiyoshi Hara 1-1-1, Shinmeiwa-cho, Takarazuka-shi, Hyogo F-term in Industrial Machinery Systems Division, Shinmeiwa Kogyo Co., Ltd. 3H058 AA04 BB24 BB32 BB33 CA20 CA23 CC07 CC08 EE01

Claims (5)

[Claims] 1. A ball type check valve in which a ball composed of a core member and an elastic body covering the core member is accommodated in a valve box, wherein the elastic body is １ ／ of a total surface area of the core member. A main body for housing and holding the core member so as to cover a larger area, and a lid fixed to the main body so as to close an opening of the main body. Check valve. 2. A ball check valve in which a ball composed of a core member and an elastic body covering the core member is accommodated in a valve box, wherein the elastic body is integrally formed. Ball type check valve. 3. The ball-type check valve according to claim 1, wherein an outer diameter of the core member is smaller than a width of the ball guide. 4. A method for manufacturing a ball, comprising a core member and an elastic body covering the core member, provided on a ball-type check valve, wherein the area is larger than 全 of the total surface area of the core member. A first elastic member accommodating the core member so as to cover the first member;
Forming a second elastic member covering the entire surface of the core member together with the elastic member; packing the core member in the first elastic member; and forming the first elastic member so as to cover the core member. The second
Fixing the elastic member. 5. A method of manufacturing a ball comprising a core member and an elastic body covering the core member and provided in a ball type check valve, comprising: a step of winding an elastic body material around the entire surface of the core member; And vulcanizing the elastic material.