Ball valve

Abstract

The utility model discloses a ball valve which comprises a valve body, a valve rod installed on the valve body and a packing gland arranged outside the valve rod in a sleeved mode, and packing is pressed in a packing bin of the valve body through a disc spring arranged on the packing gland. A thrust part is further arranged in the valve body, and the valve body abuts against the valve rod through the thrust part so as to prevent the valve rod from moving upwards. The middle of the thrust piece is arranged on the valve rod in a sleeving mode, a first thrust face is further arranged on the thrust piece, and the thrust piece is attached to a second thrust face arranged on the valve rod through the first thrust face. And the first thrust surface and the second thrust surface are inclined surfaces. Due to the fact that the first anti-thrust face is arranged on the anti-thrust piece, the second anti-thrust face is arranged on the valve rod, and the first anti-thrust face and the second anti-thrust face are both inclined faces, after the two anti-thrust faces are matched with each other, the contact area of the anti-thrust piece and the valve rod can be increased, and the anti-thrust capacity of the anti-thrust piece to the valve rod can be improved. And the method is worthy of popularization and application.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a ball valve. Background Technology

[0002] For ease of assembly, existing ball valves are typically configured with two valve bodies, as illustrated in the prior art (CN107654692A). The general design is as follows: A thrust washer, an O-ring, packing, a packing ring, and a fastening nut are sequentially fitted onto the valve stem, moving away from the ball. These components are located within the cavity of the valve neck and mounting platform. The thrust washer is held between the first and second bosses, the O-ring is located in a groove, and the fastening nut is threaded to the valve stem. It can be seen that the thrust washer is similar to a flat washer. Because the thrust washer and valve stem have direct planar contact, the contact area between the thrust surface and the valve stem is limited, thus affecting the thrust resistance of the thrust washer. Utility Model Content

[0003] The purpose of this invention is to provide a ball valve to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a ball valve, comprising a valve body, a valve stem mounted on the valve body, and a packing gland sleeved on the valve stem, wherein a disc spring is provided by the packing gland to press the packing into the packing chamber of the valve body; the valve body is also provided with a thrust member, which abuts against the valve stem to prevent the valve stem from moving upward; the middle part of the thrust member is sleeved on the valve stem, and the thrust member is also provided with a first thrust surface, which is attached to a second thrust surface provided on the valve stem; both the first thrust surface and the second thrust surface are inclined surfaces.

[0005] As a preferred technical solution of this utility model: the inclination angle between the first thrust surface and the second thrust surface is 45 degrees.

[0006] As a preferred technical solution of this utility model, the valve stem is also provided with an annular groove for installing an O-ring seal.

[0007] As a preferred technical solution of this utility model: the packing gland includes an outer ring portion, and support portions are symmetrically arranged on both sides of the outer ring portion, and the support portions are also provided with through holes.

[0008] As a preferred technical solution of this utility model: the side of the support portion facing the disc spring is provided with a support surface, and the outer side of the support surface is also provided with a clearance surface.

[0009] As a preferred technical solution of this utility model: an angle α is formed between the avoidance surface and the support surface, and the angle α is between 1 and 9 degrees.

[0010] As a preferred technical solution of this utility model: the side of the support part away from the disc spring is also provided with a limiting groove, and the cross-section of the limiting groove is rhomboid.

[0011] The beneficial effects of this utility model by adopting the above technical solution are: 1. Since the thrust member is provided with a first thrust surface and the valve stem is provided with a second thrust surface, and both the first thrust surface and the second thrust surface are inclined surfaces, when the two thrust surfaces cooperate with each other, not only can the contact area between the thrust member and the valve stem be increased, but also the thrust member's thrust resistance to the valve stem can be improved.

[0012] 2. Because the two thrust surfaces are fitted with an inclined surface, debris falling onto the second thrust surface can slide off quickly, reducing the amount of debris remaining between the two thrust surfaces and thus reducing the gap between them, which would affect the thrusting capacity of the thrust component.

[0013] 3. By utilizing the mutual contact of the inclined surfaces, the thrust member can simultaneously resist the thrust of the valve stem in all directions, thus further ensuring that the ball can rotate stably and reliably at the predetermined position. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main structure of this utility model;

[0015] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0016] Figure 3 This is a schematic diagram of the main structure of the valve stem of this utility model;

[0017] Figure 4 This is a cross-sectional structural diagram of the thrust member of this utility model;

[0018] Figure 5 This is a top view of the structure of the packing gland of this utility model;

[0019] Figure 6 This is a schematic cross-sectional view of the packing gland structure of this utility model.

[0020] In the diagram: 1. Valve body; 2. Disc spring; 3. Valve stem; 4. Thrust member; 5. Packing gland; 6. Support surface; 7. Clearance surface; 8. Through hole; 9. Annular groove; 10. First thrust surface; 11. Second thrust surface; 12. Support part; 13. Outer ring part; 14. Limiting groove. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "upper surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model.

[0022] Please see Figure 1-6 This utility model provides an embodiment of a ball valve, comprising a valve body 1, a valve stem 3 mounted on the valve body 1, and a packing gland 5 sleeved on the valve stem 3. The packing gland 5 uses a disc spring 2 to press the packing into the packing chamber of the valve body 1. The valve body 1 also has a thrust member 4, which abuts against the valve stem 3 to prevent the valve stem 3 from moving upward. The middle part of the thrust member 4 is sleeved on the valve stem 3, and the thrust member 4 also has a first thrust surface 10, which is attached to a second thrust surface 11 on the valve stem 3. Both the first thrust surface 10 and the second thrust surface 11 are inclined surfaces.

[0023] In summary, since the thrust member 4 is provided with a first thrust surface 10 and the valve stem 3 is provided with a second thrust surface 11, and both the first thrust surface 10 and the second thrust surface 11 are inclined surfaces, when the two thrust surfaces cooperate with each other, not only can the contact area between the thrust member 4 and the valve stem 3 be increased, but also the thrust resistance of the thrust member 4 to the valve stem 3 can be improved.

[0024] At the same time, since the two thrust surfaces are fitted with an inclined surface, the debris falling onto the second thrust surface 11 can slide off quickly, reducing the amount of debris remaining between the two thrust surfaces and thus reducing the gap between the thrust surfaces, which would affect the thrusting ability of the thrust component.

[0025] In addition, by utilizing the mutual contact of the inclined surfaces, the thrust member 4 can simultaneously resist the thrust of the valve stem 3 in all directions, thus further ensuring that the ball can rotate stably and reliably at the predetermined position.

[0026] Specifically, the first thrust surface 10 and the second thrust surface 11 have an inclination angle of 45 degrees. Based on this, the incline of this angle increases the contact area of ​​the two thrust surfaces while ensuring a tight fit, thus preventing gaps between their opposing surfaces and further improving the sealing performance between the valve stem 3 and the thrust member 4. In particular, since both the first thrust surface 10 and the second thrust surface 11 are at 45 degrees, the valve stem 3 and the thrust member 4 can be formed on a lathe using only a chamfering process, simplifying the machining process of the two thrust surfaces.

[0027] To ensure the sealing between the valve stem 3 and the packing chamber, the valve stem 3 is also provided with an annular groove 9 for installing an O-ring seal.

[0028] Based on the above solution, since the packing gland 5 includes an outer ring portion 13 and symmetrically arranged support portions 12 on both sides of the outer ring portion 13, and the support portion 12 is also provided with through holes 8, the packing gland 5 can be fixed to the valve body 1 by bolts passing through the through holes 8. At the same time, the arrangement of the support portion 12 can expand the contact area between the packing gland 5 and the valve body 1, thereby enabling the packing gland 5 to be stably and reliably connected to the valve body 1 while also pressing the disc spring 2. Therefore, compared with the prior art, it is not necessary to use a fastening nut to connect with the valve stem to complete the disc spring pressing and there is no need to process threads on the valve stem, thus simplifying the processing technology of the valve stem 3.

[0029] Furthermore, since the side of the support part 12 facing the disc spring 2 is provided with a support surface 6, and the outer side of the support surface 6 is also provided with a relief surface 7, the support surface 6 can be used to press on the disc spring 2, and the relief surface 7 can be used to provide adaptive space on both sides of the disc spring 2, thereby reducing the interference of the support part 12 with the deformation of the disc spring 2.

[0030] Specifically, an angle α is formed between the clearance surface 7 and the supporting surface 6, and the angle α is between 1 and 9 degrees, wherein the angle α is preferably 5 degrees. Within this angle range, it is not only convenient to process the clearance surface 7, but also does not affect the operation of the disc spring 2.

[0031] In addition, the side of the support 12 away from the disc spring 2 is provided with a limiting groove 14, and the cross-section of the limiting groove 14 is rhomboid. Therefore, after the bolt passes through the through hole 8, the packing gland 5 can be positioned by using the rhomboid pressure plate installed in the rhomboid limiting groove 14, so as to ensure the reliable operation of the ball valve.

[0032] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A ball valve, characterized in that: It includes a valve body (1), a valve stem (3) mounted on the valve body (1), and a packing gland (5) sleeved on the valve stem (3). The packing gland (5) presses the packing into the packing chamber of the valve body (1) through the disc spring (2). The valve body (1) is also provided with a thrust member (4), which abuts against the valve stem (3) to prevent the valve stem (3) from moving upward. The middle part of the thrust member (4) is sleeved on the valve stem (3), and the thrust member (4) is also provided with a first thrust surface (10), and the first thrust surface (10) is attached to the second thrust surface (11) provided on the valve stem (3), and both the first thrust surface (10) and the second thrust surface (11) are inclined surfaces.

2. A ball valve according to claim 1, characterized in that: The first thrust surface (10) and the second thrust surface (11) have an inclination angle of 45 degrees.

3. A ball valve according to claim 2, characterized in that: The valve stem (3) is also provided with an annular groove (9) for installing an O-ring seal.

4. A ball valve according to claim 1, 2, or 3, characterized in that: The packing gland (5) includes an outer ring (13) and symmetrically arranged support portions (12) on both sides of the outer ring (13), and the support portions (12) are also provided with through holes (8).

5. A ball valve according to claim 4, characterized in that: The support part (12) has a support surface (6) on the side facing the disc spring (2), and a clearance surface (7) is provided on the outer side of the support surface (6).

6. A ball valve according to claim 5, characterized in that: An angle α is formed between the avoidance surface (7) and the support surface (6), and the angle α is between 1 and 9 degrees.

7. A ball valve according to claim 6, characterized in that: The support part (12) is provided with a limiting groove (14) on the side away from the disc spring (2), and the cross-section of the limiting groove (14) is rhomboid.

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