Ball core of wear-resistant eccentric semi-ball valve

Abstract

One end of the ball core is provided with a spline hole, the other end of the ball core is provided with a semi-spherical surface, the ball center of the semi-spherical surface deviates from the axial lead of the spline hole, the ball core is composed of a ball core body and a ball crown, the spline hole is located at the inner end of the ball core body, and the spherical crown is located at the outer end of the ball core body. The inner side face of the spherical crown is fixedly connected with the spherical core body at the outer end of the spherical core body, the outer side face of the spherical crown is the semi-spherical face, and the spherical crown is made of hard alloy materials. The eccentric semi-ball valve has the advantages that the wear resistance of the whole ball core, especially the semi-spherical surface, can be met, and the service life of the eccentric semi-ball valve is remarkably prolonged; the material hardness of the ball core body is easy to manufacture and process; and the application of high-hardness materials with relatively high prices can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a ball core of wear -resisting eccentric core half -ball valve belongs to valve technical field. BACKGROUND

[0002] A kind of ball valve, for extremely harsh environment, such as for the switching control of water flow containing a large amount of mortar.This water flow containing a large amount of mortar is long time strong scouring to the surface of valve core component when flowing through ball valve, can cause wear to surface in very short time, cause valve to close not tightly.

[0003] The ball core of eccentric half -ball valve has spline hole for sleeving rotating shaft at one end, and has hemispherical surface at the other end, the spherical center of hemispherical surface is not on the axis of spline hole, and the water outlet hole or water inlet hole of ball valve is blocked by hemispherical surface.

[0004] In order to enhance the surface wear resistance of hemispherical surface and the whole ball core, the prior art is to spray welding on the surface of ball core made of ordinary steel parts, and then polishing.But in actual application, the wear resistance of this surface treatment is still not ideal, and the service life is short, and it is very time-consuming and laborious to replace. INVENTION CONTENTS

[0005] The technical problem to be solved by the utility model is: how to further enhance the wear resistance of the whole ball core, especially the hemispherical surface.

[0006] In view of the above problems, the technical solution provided by the utility model is:

[0007] A ball core of wear -resisting eccentric core half -ball valve, one end has spline hole, the other end has hemispherical surface, the spherical center of hemispherical surface deviates from the axis of inner spline hole, the ball core is composed of ball core body and ball crown, the spline hole is located at the inner end of ball core body, the inner side of ball crown is fixedly connected with ball core body at the outer end of ball core body, the outer side of ball crown is the hemispherical surface, and the hardness of ball crown material is greater than the hardness of ball core body.

[0008] The ball crown is made of hard alloy material.

[0009] The center of the ball crown has a counterbore bolt hole arranged in the radial direction, the outer end of the ball core body is provided with a threaded hole, and the ball crown and the ball core body are fastened and connected by means of a counterbore bolt hole arranged on the ball crown and a threaded hole arranged on the ball core body.

[0010] A positioning hole one is arranged on the ball core body and is perpendicular to the threaded hole, a positioning hole two is arranged on the bolt and can communicate with the positioning hole one, and the bolt located in the threaded hole is fixed by a pin inserted into the positioning hole one and the positioning hole two, to prevent it from rotating by itself.

[0011] The outer end of the ball core body is cylindrical, the inner side of the spherical cap has a recessed cylindrical cavity, and the outer end of the ball core body is inserted into the cylindrical cavity of the spherical cap in a close-fitting manner.

[0012] The head of the bolt is located in the countersunk bolt hole, and the countersunk bolt hole is filled with a wear-resistant welded body at the hole mouth.

[0013] Except for the surfaces at both ends of the spline hole and the surface covered by the spherical cap, the outer periphery of the ball core body has a wear-resistant spray welding layer. Advantages

[0014] 1. The wear resistance of the entire ball core, especially the hemispherical surface, can be improved, and the service life of the eccentric core hemispherical valve can be significantly improved.

[0015] 2. The hardness of the ball core body material is easy to process.

[0016] 3. The application of high-hardness materials with relatively high prices can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A three-dimensional schematic view of the ball core according to Embodiment 1 is shown.

[0018] Figure 2 A split cross-sectional view of the ball core according to Embodiment 1 is shown.

[0019] Figure 3 An assembled cross-sectional view of the ball core according to Embodiment 1 is shown.

[0020] Figure 4 A split cross-sectional view of the ball core according to Embodiment 2 is shown.

[0021] In the figure: 1, ball core body; 101, spline hole; 102, threaded hole; 103, positioning hole one; 2, spherical cap; 201, hemispherical surface; 202, countersunk bolt hole; 203, cylindrical cavity; 204, wear-resistant welded body; 3, bolt; 301, positioning hole two; 4, pin; 5, spray welding layer. DETAILED DESCRIPTION

[0022] The utility model will be further described below in combination with the drawings: Embodiment 1

[0023] As Figure 1As shown in Figure 3, a wear-resistant eccentric hemispherical valve has a ball core with a spline hole 101 at one end and a hemispherical surface 201 at the other end. The center of the hemispherical surface 201 is offset from the axis of the inner spline hole 101. The improvement lies in that the ball core is composed of a ball core body 1 and a ball crown 2. The spline hole 101 is located at the inner end of the ball core body 1. The inner surface of the ball crown 2 is fixedly connected to the ball core body 1 at the outer end of the ball core body 1. The outer surface of the ball crown 2 is the hemispherical surface 201. The hardness of the material of the ball crown 2 is greater than that of the ball core body 1. In this way, by dividing the ball core into a ball core body 1 and a ball crown 2, the ball core body 1 can be made of an easy-to-process common metal material such as steel, while the ball crown 2 can be made of a material that meets the hardness requirements. This improves the service life of the hemispherical surface 201, which is most susceptible to frictional wear. Thus, while satisfying the wear resistance performance, the ball core component is easy to manufacture, and the use of relatively expensive high-hardness materials can be reduced.

[0024] Preferably, the spherical crown 2 is made of hard alloy material.

[0025] The center of the spherical crown 2 has a countersunk bolt hole 202 arranged radially, and the outer end of the spherical core body 1 has a threaded hole 102. The spherical crown 2 and the spherical core body 1 are fastened together by bolts 3 through the countersunk bolt hole 202 on the spherical crown 2 and the threaded hole 102 on the spherical core body 1.

[0026] The bolt head of bolt 3 is located inside the countersunk bolt hole 202, and the opening of the countersunk bolt hole 202 is filled with wear-resistant welded body 204 to ensure the hardness of the opening area of ​​the countersunk bolt hole 202.

[0027] Furthermore, the ball core body 1 is provided with a positioning hole 103 that is perpendicular to the threaded hole 102, and the bolt 3 is provided with a positioning hole 301 that can communicate with the positioning hole 103. The bolt 3 located in the threaded hole 102 is fixed by a pin 4 inserted into the positioning hole 103 and the positioning hole 301 to prevent the bolt 3 from rotating on its own.

[0028] Furthermore, the outer end of the ball core body 1 is cylindrical, and the inner surface of the ball crown 2 has a recessed cylindrical cavity 203. The outer end of the ball core body 1 is inserted into the cylindrical cavity 203 of the ball crown 2 in a tight fit to ensure the stability of the connection between the ball core body 1 and the ball crown 2. Example 2

[0029] like Figure 4 As shown, it is a further improvement of the above embodiment. In addition to the surfaces where the spline holes 101 are located at both ends and the surfaces covered by the spherical crown, the outer periphery of the ball core body 1 has a wear-resistant sprayed welding layer 5, thereby improving the wear resistance of the entire ball core body 1.

[0030] The above embodiments are only used for more clearly describing the utility model, and cannot be regarded as limiting the protection scope of the utility model, and any equivalent modification should be regarded as falling into the protection scope of the utility model.

Claims

1. A ball core of a wear-resistant eccentric ball core half-ball valve, one end of which is provided with a spline hole (101), and the other end is provided with a spherical surface (201), the spherical center of the spherical surface (201) is eccentric to the axis of the inner spline hole (101), characterized in that: The ball core is composed of a ball core body (1) and a spherical crown (2), the spline hole (101) is located at the inner end of the ball core body (1), the inner side of the spherical crown (2) is fixedly connected with the outer end of the ball core body (1), the outer side of the spherical crown (2) is the spherical surface (201), the hardness of the spherical crown (2) is greater than that of the ball core body (1).

2. The wear resistant, off-centered, semi-spherical valve ball core of claim 1, wherein: The spherical crown (2) is made of hard alloy material.

3. The wear resistant, off-centered, semi-spherical valve ball core of claim 1, wherein: The spherical crown (2) has a counter-sunk bolt hole (202) radially arranged at the center, the outer end of the ball core body (1) is provided with a threaded hole (102), the spherical crown (2) and the ball core body (1) are fastened and connected by the bolt (3) through the counter-sunk bolt hole (202) arranged on the spherical crown (2) and the threaded hole (102) arranged on the ball core body (1).

4. The wear resistant, off-centered, semi-spherical valve ball core of claim 3, wherein: The ball core body (1) is provided with a positioning hole one (103) which is perpendicular to the threaded hole (102), the bolt (3) is fixed by the pin (4) inserted into the positioning hole one (103) and the positioning hole two (301) to prevent it from rotating by itself.

5. The wear resistant, off-centered, semi-spherical valve ball core of claim 3, wherein: The outer end of the ball core body (1) is cylindrical, the inner side of the spherical crown (2) has a recessed cylindrical cavity (203), and the outer end of the ball core body (1) is inserted into the cylindrical cavity (203) of the spherical crown (2) in a close-fitting manner.

6. The wear resistant, off-centered, semi-spherical valve ball core of claim 3, wherein: The head of the bolt (3) is located in the counter-sunk bolt hole (202), and the mouth of the counter-sunk bolt hole (202) is filled with a wear-resistant welded body (204).

7. A wear resistant, off-centre, semi-spherical valve ball core according to any one of claims 3 to 6, characterised in that: Except for the surface where the spline hole (101) is located and the surface covered by the spherical crown, the outer periphery of the ball core body (1) has a wear-resistant spray welding layer (5).

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