High-performance ball valve rod and ball body fixing structure

Abstract

The utility model relates to a high-performance ball valve rod and ball body fixing structure which comprises a valve rod and a ball body, a connecting groove is formed in the ball body, a connector matched with the connecting groove for use is arranged on the end portion of the valve rod, the connecting groove comprises a round groove, and the connector comprises a round connector. According to the fixing structure of the ball body and the valve rod, compared with a square structure and a flat type fixing structure of the valve rod and the ball body in an existing fixed ball valve, a concentric circle is additionally added for cooperation, the ball body does not have large displacement even after being used for a long time, and therefore the valve rod can better control rotation of the ball body; and the sealing performance and the service life of the valve are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of ball valve especially is a kind of high-performance ball valve stem and ball body fixing structure. BACKGROUND

[0002] Fixed ball valve is widely used in petrochemical industry, and its structural feature is that ball body is fixed, valve seat is pressed to ball body under the medium pressure, to realize sealing, so the more accurate and stable ball body fixed position of fixed ball valve is, the better the sealing effect of ball valve is.

[0003] Ball body needs to be driven by valve stem to realize normal opening and closing work, the connection between stem and ball of existing fixed ball valve is roughly divided into square structure, flat structure and stem and ball integrated structure.

[0004] Among them, square structure and flat structure are similar, ball and valve stem are matched through plane gap when valve is closed, ball will have displacement after long-time use due to wear, so that ball deviates from theoretical center, which may cause torque increase or affect sealing performance during opening and closing process.

[0005] Stem and ball integrated structure has good fixing effect, but since it is integrated, the size of raw material needs to be according to the maximum size of ball, so that raw material cost is high, processing cost is also increased accordingly, stem and ball as separate parts cost 2-3 times, and stem and ball integrated valve can only be applied to top-mounted ball valve, and side-mounted ball valve cannot be assembled. INVENTION CONTENTS

[0006] The utility model discloses a kind of high-performance ball valve stem and ball body fixing structure, greatly reduce manufacturing cost, and greatly improve the service life of both.

[0007] To achieve the above object, the utility model provides a kind of high-performance ball valve stem and ball body fixing structure, including valve stem and ball body, wherein, the ball body is set with connecting groove, the end of the valve stem is provided with the connecting head of cooperation with connecting groove, the connecting groove includes the groove of cylinder, and the connecting head includes the connecting head of cylinder.

[0008] Further, the connecting head is integrally arranged with the valve stem.

[0009] Further, the connecting groove includes lower groove and upper groove communicated with lower groove, wherein, the lower groove is cuboid, the upper groove is cylinder, the connecting head includes lower connecting head and upper connecting head integrally connected and cooperated with lower groove and upper groove respectively, the lower connecting head is cuboid, and the upper connecting head is cylinder.

[0010] Further, the four corners of the lower groove are set as round corners, and the four corners of the lower connecting head are also set as round corners.

[0011] Further, the side edges of the lower groove are adhered with anti-skid rubber pads.

[0012] The high-performance ball valve stem and ball body fixing structure has the advantages that:

[0013] The ball body and the valve stem fixing structure of the application, compared with the square structure and the flat fixing structure of the valve stem and the ball body in the existing fixed ball valve, additionally has a concentric circle cooperation, so that the ball body will not have a large displacement even after long time use, thereby enabling the valve stem to better control the rotation of the ball body and improving the sealing performance and service life of the valve. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to make the content of the utility model more easily understood clearly, the utility model is further described in detail below according to the specific embodiments of the utility model and in combination with the drawings.

[0015] Fig. 1 is the structure diagram of the valve stem and the ball body fixing structure of the utility model.

[0016] Fig. 2 is the exploded view of the valve stem and the ball body fixing structure of the utility model.

[0017] Fig. 3 is the sectional view of the valve stem and the ball body fixing structure of the utility model.

[0018] In the drawing: 1, valve stem, 2, ball body, 3, upper groove, 4, lower groove, 5, lower connecting head, 6, upper connecting head. DETAILED DESCRIPTION

[0019] The utility model is further described below in combination with the drawings and specific embodiments, so that the skilled in the art can better understand the utility model and can be implemented, but the embodiments are not as the limitation of the utility model.

[0020] In combination Figs. 1-3 , the application provides a kind of high-performance ball valve stem and ball body fixing structure, including the valve stem 1 and ball body 2 capable of being combined with each other, wherein, the ball body 2 is set with connecting groove, the end of the valve stem 1 is provided with the connecting head for use with connecting groove, the combination of ball body 2 and valve stem 1 is formed by connecting head into connecting groove, the rotation of valve stem 1 can drive the rotation of ball body 2 by the combination of the two.

[0021] Specifically, the connecting groove includes lower groove 4 and upper groove 3 in communication with lower groove 4, the projection of lower groove 4 is rectangular, in this embodiment, it is square, the projection of upper groove 3 is circular, and the projection area of lower groove 4 is less than the projection area of upper groove 3,

[0022] In order to cooperate with the connecting groove, the connecting head comprises an integrally formed lower connecting head 5 and an upper connecting head 6, the projection of the lower connecting head 5 is a square capable of being inserted into the lower groove 4, the projection of the upper connecting head 6 is a circle capable of being inserted into the upper groove 3, and the projection area of the upper connecting head 6 is larger than that of the lower connecting head 5.

[0023] The diameter of the upper groove 3 is slightly larger than that of the upper connecting head 6, and in this embodiment, the diameter of the upper groove 3 is 0.2 mm larger than that of the upper connecting head 6, thereby facilitating the coating of the coating layer.

[0024] Similarly, the side length of the square of the lower groove 4 is also slightly larger than that of the square of the lower connecting head 5, and in this embodiment, it is also 0.2 mm larger.

[0025] Since the contact in the rectangular form is a line contact, wear will occur after long-term use, resulting in displacement. Therefore, in this application, a circular structure is further provided on the basis of the rectangular contact, and the gap between the circles is small, which is equivalent to point contact. Therefore, after long-term use of the valve stem 1 and the ball 2, no obvious displacement will occur, so that the valve stem 1 can better control the rotation of the ball 2, and the service life of the two is improved.

[0026] In this embodiment, the connecting head is integrally provided with the valve stem 1.

[0027] In addition, the four corners of the lower groove 4 are provided with rounded corners, and the four corners of the lower connecting head 5 are also provided with rounded corners.

[0028] Since the ball 2 and the valve stem 1 are both made of metal material, and the surfaces of the two are also coated with a layer of PTFE coating, the entire ball 2 and valve stem 1 are not easy to be immersed in the liquid and rust, and the PTFE coating also has good protective effect on the ball 2 and the valve stem 1, so that they cannot directly contact any fluid, but can first contact through the PTFE coating. Only when the PTFE coating is scraped off, the ball 2 and the valve stem 1 can contact the fluid, which greatly improves the service life of the entire ball valve.

[0029] In order to increase the friction between the valve stem 1 and the ball 2, the side edges of the lower groove 4 are adhered with anti-skid rubber pads, so that the friction between the lower groove 4 and the lower connecting head 5 is increased, and the valve stem 1 can better drive the rotation of the ball 2.

[0030] In the description of the embodiments of the utility model, still need to explain, unless another explicit provision and limitation, if appear the term "arrangement", "connection" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0031] Obviously, the above embodiments are only examples for clearly illustrating, and not limited to the embodiments. For ordinary skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the utility model creation.

Claims

1. A high performance ball valve stem and ball fixation structure, characterized by: The utility model relates to a valve stem and ball, wherein the ball is provided with a connecting groove, the end of the valve stem is provided with a connecting head matched with the connecting groove, the connecting groove comprises a lower groove and an upper groove communicated with the lower groove, the lower groove is a cuboid, the upper groove is a cylinder, the connecting head comprises a lower connecting head and an upper connecting head connected integrally, the lower connecting head is a cuboid, and the upper connecting head is a cylinder.

2. A high performance ball valve stem and ball fixation structure according to claim 1, characterized in that: The connecting head is integrally arranged with the valve stem.

3. The high performance ball valve stem and ball fixation structure of claim 1, wherein: The four corners of the lower groove are provided with rounded corners, and the four corners of the lower connecting head are also provided with rounded corners.

4. The high performance ball valve stem and ball fixation structure of claim 1, wherein: The side of the lower groove is adhered with a non-slip rubber pad.

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