CN110259979B

CN110259979B - Ball valve

Info

Publication number: CN110259979B
Application number: CN201910456428.XA
Authority: CN
Inventors: 童增耀
Original assignee: Ningbo Lianda Plastic Pipe Co Ltd
Current assignee: Ningbo Lianda Plastic Pipe Co Ltd
Priority date: 2019-05-29
Filing date: 2019-05-29
Publication date: 2021-02-09
Anticipated expiration: 2039-05-29
Also published as: CN110259979A

Abstract

The invention discloses a ball valve, which comprises a valve body, a valve body and a ball valve, wherein the valve body is provided with an inlet flow path, an outlet flow path and an internal space connecting the flow paths; a ball provided in the internal space and configured to open and close the flow path by rotating around a reference axis; an operating mechanism for rotating the ball about the reference axis; a valve stem for connecting the operating mechanism and the ball; the bottom of the inner space of the valve body is provided with a shaft seat, the shaft seat is provided with a rotating shaft which is coaxial with the valve rod, the rotating shaft is used for rotatably supporting the ball body, and a gap is reserved between the axial direction of the shaft seat and the valve body. The invention makes the valve rod and the rotating shaft at two ends of the sphere form a stress fulcrum when the sphere is stressed on one side, thus preventing the problem that the valve rod is easy to bend when stressed on one side for a long time.

Description

Ball valve

Technical Field

The invention relates to the technical field of valves, in particular to a ball valve.

Background

With the development of urban pipe networks, a PE pipe valve is gradually replacing a metal pipe valve as a carrier for gas delivery, and a PE ball valve also plays a role in opening and closing during the process of pipeline gas delivery. The PE ball valve has the advantages of corrosion resistance, maintenance-free property, small opening and closing moment, light weight and the like. During installation and construction, the device has the advantages of convenience in carrying, simplicity in welding and the like.

But because the PE ball valve often need bear great pressure, the spheroid is direct to be connected with the valve rod that is used for formulating the spheroid in traditional PE ball valve, when the spheroid is when the unilateral atress, valve rod unilateral forms the atress fulcrum, and it takes place the problem of buckling very easily when using for a long time, and this results in spheroid offset, influences the sealing performance of spheroid and valve body internal seal spare then.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides the ball valve.

The invention is realized by the following technical scheme: a ball valve, comprising:

a valve body having an inlet flow path, an outlet flow path, and an internal space connecting these flow paths;

a ball provided in the internal space and configured to open and close the flow path by rotating around a reference axis;

an operating mechanism that rotates the sphere about a reference axis;

a valve stem for coupling the operating mechanism and the ball;

it is characterized in that the preparation method is characterized in that,

the bottom of the inner space of the valve body is provided with a shaft seat, the shaft seat is provided with a rotating shaft which is coaxial with the valve rod, the rotating shaft is used for rotatably supporting the ball body, and a first gap is formed between the axial direction of the shaft seat and the valve body.

In the above technical scheme, an inlet pipeline and an outlet pipeline are respectively inserted at two ends of the valve body, and the inlet flow path and the outlet flow path are located in the inlet pipeline and the outlet pipeline.

In the above technical solution, a bushing is disposed at a fitting portion between the ball and the inlet flow path and the outlet flow path, and a seal ring is disposed between the bushing and the ball.

In the technical scheme, a circle of convex rings are arranged on the inner wall of the valve body, and the inlet pipeline and the outlet pipeline are respectively abutted against different sides of the convex rings.

In the above technical scheme, the lower end of the valve rod is provided with a square key part, the ball body is provided with a key groove, the square key part is arranged in the key groove, a second gap is formed in the axial direction of the key groove by the square key part, and the square key part is fixed in the width direction of the key groove.

The invention has the following beneficial effects: the invention makes the valve rod and the rotating shaft at two ends of the sphere form a stress fulcrum when the sphere is stressed on one side, thus preventing the problem that the valve rod is easy to bend when stressed on one side for a long time.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic perspective view of the present invention.

Fig. 3 is a cross-sectional view taken along a-a of fig. 1.

Fig. 4 is a schematic perspective view of the valve stem.

Fig. 5 is a partially enlarged schematic view at a in fig. 3.

Detailed Description

The invention is described in further detail below with reference to the following detailed description and accompanying drawings: referring to fig. 1 to 2, a ball valve includes a valve body 1 having an inlet flow path 10, an outlet flow path 11, and an inner space 12 connecting between the flow paths; a ball 2 is provided in an internal space 12 of the valve body 1, and the ball 2 opens and closes the flow path by rotating about a reference axis; the sphere 2 and the operation mechanism 3 are connected by a valve rod 4, and the operation mechanism 3 controls the sphere 2 to rotate around the reference axis, and the operation mechanism 3 may be a manual operation mechanism or an electric operation mechanism, and the type of the operation mechanism 3 is not limited in this application.

An axle seat 5 is arranged at the bottom of the inner space 12 of the valve body 1, a rotating shaft 6 coaxial with the valve rod 4 is arranged on the axle seat 5, the rotating shaft 6 is used for rotatably supporting the ball 2, and a first gap 100 is arranged between the axial direction of the axle seat 5 (the axial direction is defined as the horizontal direction in fig. 2) and the valve body 1. Above-mentioned structure makes when the spheroid is when the unilateral atress, forms the atress fulcrum by the valve rod and the pivot that are located the spheroid both ends, has consequently prevented the problem that the valve rod is buckled easily when long-term unilateral atress, in addition, because has certain clearance between axle bed axial and the valve body, when this makes the axiality machining precision have certain error between pivot and the valve rod, it still can provide stable rotation support for the spheroid.

An inlet pipeline 200 and an outlet pipeline 201 are respectively inserted into two ends of the valve body, and the inlet flow path and the outlet flow path are positioned in the inlet pipeline and the outlet pipeline. A ring of raised rings 13 is arranged on the inner wall of the valve body 1, and the inlet pipe 200 and the outlet pipe 201 respectively abut against different sides of the raised rings, i.e. when the inlet pipe 200 and the outlet pipe 201 are inserted to the abutting position of the raised rings 13, the installation is completed. A bush 8 is provided at the fitting of the inlet flow path 10 and the outlet flow path 11 to the ball, and a seal ring 7 is provided between the bush 8 and the ball 2.

Referring to fig. 3 to 4, the lower end of the valve rod 4 is provided with a square key portion 40, the ball is provided with a key groove 20, the square key portion 40 is arranged in the key groove 20, and the square key portion 40 forms a second gap 101 in the axial direction of the key groove 20 (the horizontal direction in fig. 2 is defined as the axial direction), and the square key portion 40 is fixed in the width direction of the key groove 20 (i.e. the square key portion 40 cannot move along the width direction of the key groove 20); the above structure enables the valve rod 4 to be operated by the operation structure under normal conditions and drives the ball 2 to rotate around the reference axis; when the ball body is stressed on one side, the ball body is radially displaced due to unilateral thrust, and the displacement is controllable under the action of the valve rod and the fixed seat; specifically, when a force is applied to one side of the ball, the upper end of the ball is displaced to abut against one side of the square key part 40 and the key groove 20, and the lower end of the ball is displaced to abut against the shaft seat and the valve body; in addition, in the structure, when the ball body is stressed on one side (namely the ball valve works), the ball body displaces to press the sealing ring, so that the sealing performance between the sealing ring and the ball body is greatly improved; when the ball body is not stressed (namely the ball valve is not in work), the pressure between the sealing ring and the ball body is small, so that the service life of the sealing ring is greatly prolonged.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be appreciated by persons skilled in the art that the present invention is not limited by the embodiments described above. The foregoing embodiments and description of the invention have been provided for the purposes of illustrating the principles of the invention and is subject to various changes and modifications without departing from the spirit and scope of the invention. Such variations and modifications are intended to be within the scope of the claimed invention.

Claims

1. A ball valve includes a valve body having an inlet flow path, an outlet flow path, and an internal space connecting the flow paths; a ball provided in the internal space and configured to open and close the flow path by rotating around a reference axis; an operating mechanism that rotates the sphere about a reference axis; a valve stem for coupling the operating mechanism and the ball; the ball valve is characterized in that a shaft seat is arranged at the bottom of the inner space of the valve body, a rotating shaft which is coaxial with the valve rod is arranged on the shaft seat and used for rotatably supporting the ball body, a first gap is formed between the axial direction of the shaft seat and the valve body, a square key part is arranged at the lower end of the valve rod, a key groove is formed in the ball body, the square key part is arranged in the key groove, a second gap is formed in the axial direction of the key groove by the square key part, and the square key part is fixed in the width direction of the key groove.

2. The ball valve of claim 1, wherein: an inlet pipeline and an outlet pipeline are respectively inserted into two ends of the valve body, and the inlet flow path and the outlet flow path are positioned in the inlet pipeline and the outlet pipeline.

3. A ball valve according to claim 1 or 2, wherein bushings are provided at the engagement of the inlet and outlet flow paths with the ball, and sealing rings are provided between the bushings and the ball.

4. A ball valve as claimed in claim 2, wherein: the inner wall of the valve body is provided with a circle of convex rings, and the inlet pipeline and the outlet pipeline are respectively abutted against different sides of the convex rings.