CN111457121A

CN111457121A - Injection molding ball valve and manufacturing method thereof

Info

Publication number: CN111457121A
Application number: CN201910054906.4A
Authority: CN
Inventors: 包利江
Original assignee: Jiangyin Bauer Plastic Co ltd
Current assignee: Jiangyin Bauer Plastic Co ltd
Priority date: 2019-01-21
Filing date: 2019-01-21
Publication date: 2020-07-28

Abstract

The injection molding ball valve is characterized by further comprising an inner valve liner, wherein the inner valve liner is located between the valve ball and the valve body, the inner wall of the inner valve liner is matched with the outer wall of the valve ball, and the outer wall of the inner valve liner is matched with the inner wall of the valve body. When the ball valve is manufactured, the valve ball is arranged in the inner valve liner, and then the valve body is formed on the outer side of the inner valve liner in an injection molding mode. The invention has the advantages that: the problem of be difficult to twist the handle of control valve ball in the ball valve of moulding plastics is solved.

Description

Injection molding ball valve and manufacturing method thereof

Technical Field

The invention belongs to the technical field of valves, and particularly relates to a structure of an injection molding ball valve and a manufacturing method thereof.

Background

Since the injection molded ball valve appeared in the market in about 2005, the injection molded ball valve is popular due to low cost and convenient production. In the prior art, ball valves are classified into two types according to the manufacturing method of the valve body. The valve body is spliced, the valve body is divided into a left part and a right part, and the valve ball is installed in the spliced valve body. The other valve body is formed by injection molding, and the valve body is usually formed by one-time injection molding on the outer side of a manufactured valve ball, so that the valve body has the advantages of stable structure and difficulty in leakage. However, in the production mode, the gap between the valve ball and the valve body is difficult to control, the valve ball cannot be used if the gap is too large, and if the gap is controlled to be small, the valve ball and the valve body are often clamped due to expansion caused by heat and contraction caused by cold in the injection molding process, so that the valve ball is difficult to screw and rotate during use, and great force is often required. This leads to the problem that the produced ball valve needs larger force to control and also leads to the problem that the rejection rate of the ball valve in the production process is high.

If the advantages of stable structure and difficult leakage can be maintained during the production of the injection molding ball valve, the problems of large force requirement for control and high rejection rate can be solved, and the positive significance can be generated.

The invention content is as follows:

the invention aims to solve the problems that great force is required for screwing and the rejection rate is high while keeping the advantages of stable structure and difficult leakage of the ball valve.

The purpose of the invention is realized by the following technical means:

the utility model provides a ball valve moulds plastics, includes valve ball, valve rod, valve body, the valve ball install in the valve body, the valve ball is connected with the valve rod, still includes the inner valve courage, the inner valve courage be located between valve ball and the valve body, the inner wall and the valve ball outer wall of inner valve courage match, the outer wall of inner valve courage matches with the inner wall of valve body.

As a further improvement, the inner valve liner is formed by splicing two separated parts, and the two separated parts both comprise a part of the inner wall of the inner valve liner.

As a further improvement, the valve ball can rotate relative to the inner valve liner; the positions of the inner valve liner and the valve body are relatively fixed.

As a further improvement, the inner valve liner is provided with a liquid flow hole which is communicated with the interface of the valve body.

The invention has the advantages that: the problem of be difficult to twist the handle of control valve ball in the ball valve of moulding plastics is solved.

Description of the drawings:

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a front view of the inner valve bladder of the present invention;

FIG. 3 is a top view of the inner valve bladder of the present invention;

FIG. 4 is an overall view of the invention after completion of injection molding.

The reference numerals for the figures are as follows:

1. a valve body; 2. a valve stem; 3. a valve ball; 4. an inner valve liner; 5. a valve stem port; 6. a handle.

The specific implementation mode is as follows:

as shown in fig. 4, the structure of the injection molded ball valve is an integral structure, the valve body 1 is an integral structure after the injection molding, the valve body 1 is provided with a connector for connecting a pipeline, the left and right sides of the connector in fig. 4 are only used for illustration, and the invention can be applied to ball valves with other types of connectors. The valve rod 2 exposed at the top of the valve body 1 in fig. 4 is used for connecting a handle 6, and the connecting mode of the handle 6 belongs to the conventional technology in the field and is omitted. An inner valve liner 4 is arranged in the middle of the valve body 1, and a valve ball 3 is arranged in the inner valve liner 4. The on-off of the ball valve is realized by controlling the valve rod 2 to rotate the valve ball 3, so that the hole on the valve ball 3 is communicated with and closed off from a pipeline connected with the valve body 1.

As shown in fig. 1, which is a cross-sectional view of an injection molded ball valve, unlike the prior art, an inner valve liner 4 is installed between a valve body 1 and a valve ball 3. The inner wall of the inner valve liner 4 is matched with the outer wall of the valve ball 3, and the outer wall of the inner valve liner 4 is matched with the inner wall of the valve body 1, so that the inner valve liner 4 has a shape and a size which can stably contain the valve ball 3, and has a shape and a size which can stably contain the valve body 1, and a liquid flow hole can enable the joints of the valve body 1 to be communicated with each other through the liquid flow hole and the hole of the valve ball 3 in the rotation of the valve ball 3.

As shown in fig. 2 and 3, the inner valve body 4 may have a structure in which the inner valve body 4 is divided into two sides by using the valve stem 2 as a center line, so as to accommodate the valve ball 3 therein, and the top semicircular valve stem opening 5 is circular after the inner valve body 4 is completely assembled, so that the valve stem 2 can pass therethrough and rotate. The above-described structure is merely illustrative, and the object of installing the valve ball 3 between the two portions of the inner valve casings 4 can be solved only by including a portion of the inner wall of the inner valve casing 4 in the two portions separated from each other. For example, the valve ball 3 can be divided into an upper half and a lower half, and a left half and a right half, or can be divided into a larger part and a smaller part, the larger part is provided with a notch for placing the valve ball 3 at any position, and after the valve ball 3 is placed, the notch is filled in the smaller part.

As a further improvement, the structure is that the valve ball 3 can rotate relative to the inner valve liner 4, and the positions of the inner valve liner 4 and the valve body 1 are relatively fixed. When the valve rod 2 rotates to control the valve ball 3 to rotate, the inner valve liner 4 cannot rotate along with the valve ball 3. The technical purpose can be achieved by adjusting the shapes of the inner wall and the outer wall of the inner valve liner 4, and the detailed description is omitted.

And if the position between the inner valve liner 4 and the valve body 1 can enable the liquid flow hole of the inner valve liner 4 and the interface of the valve body 1 to be in a normally open state, the purpose that the ball valve is not influenced by the structure of the inner valve liner 4 when the valve ball 3 rotates to control the on-off of the ball valve can be achieved.

When the injection molding ball valve is produced, the valve body 1 is directly injected outside the valve ball 3 in the prior art, and the problem that the valve ball 3 is difficult to rotate is easily caused by the shape change generated by thermal expansion and cold contraction. When the injection molding ball valve is produced, the valve ball 3 needs to be installed in the inner valve container 4 before the injection molding ball valve, and the shape and the size of the inner wall of the inner valve in a splicing mode can ensure that the valve ball 3 can smoothly rotate in the inner valve. When the valve body 1 is injection-molded, due to the protection of the inner valve liner 4, the smooth degree of rotation between the molded inner valve liner 4 and the valve ball 3 can not be caused by the temperature change in the injection molding process. Therefore, the ball valve of the structure can greatly reduce the problem that the handle 6 of the control valve ball 3 is difficult to screw in the injection molding ball valve. Meanwhile, the valve body 1 is integrally molded, so that the advantages of an integrally molded ball valve in the prior art are retained, the structure is stable, leakage is not easy to occur, and the service life is long. Compared with the prior art, the invention can obviously reduce the reject ratio of products and improve the smoothness of the rotation of the valve ball 3 only by adding little process cost.

The embodiments described herein are merely illustrative of the spirit of the invention and embodiments thereof may be modified or supplemented by, or substituted in a similar manner without departing from the spirit of the invention or exceeding the scope as defined in the appended claims.

Claims

1. The injection molding ball valve is characterized by further comprising an inner valve liner, wherein the inner valve liner is located between the valve ball and the valve body, the inner wall of the inner valve liner is matched with the outer wall of the valve ball, and the outer wall of the inner valve liner is matched with the inner wall of the valve body.

2. An injection molded ball valve as claimed in claim 1, wherein: the inner valve liner is formed by splicing two separated parts, and the two separated parts both comprise a part of inner wall of the inner valve liner.

3. An injection molded ball valve as claimed in claim 1, wherein: the valve ball can rotate relative to the inner valve liner; the positions of the inner valve liner and the valve body are relatively fixed.

4. An injection molded ball valve as claimed in claim 1, wherein: the inner valve liner is provided with a liquid flow hole which is communicated with the interface of the valve body.

5. A method of manufacturing an injection molded ball valve according to claims 1 to 4, wherein: the method comprises the following steps: and installing the valve ball in the inner valve liner, and then performing injection molding on the valve body outside the inner valve liner.