A valve ball and valve rod connecting structure and a ball valve

Abstract

The utility model belongs to fluid valve technical field provides a valve ball and valve rod connecting structure and ball valve, including valve ball and valve rod, the top of valve ball is provided with valve ball groove, the bottom fixed connection of valve rod has valve rod lower part flat, be provided with the deflection connecting pair for making the valve rod with the valve ball between the valve ball groove with valve rod lower part flat between the deflection of the valve rod with the valve ball. The utility model discloses valve rod and valve ball can find right -after assembling automatically to guarantee valve rod and valve ball centring coaxial, reduce the rotation torque of valve rod to improve the service life of ball valve indirectly.

Description

Technical Field

[0001] This utility model belongs to the field of fluid valve technology, and particularly relates to a valve ball and valve stem connection structure and a ball valve. Background Technology

[0002] As a key component in fluid control, the opening and closing performance of ball valves directly affects the reliability of pipeline systems. In traditional ball valve structures, after assembly, the core components such as the valve seat, valve plug, ball gasket, valve ball, and valve stem are difficult to perfectly align theoretically due to accumulated machining tolerances and inherent assembly errors. This coaxiality deviation causes asymmetric contact stress at the contact points when the valve stem drives the valve body to rotate, significantly increasing the opening and closing torque. The eccentric contact between the valve ball and valve stem causes localized stress concentration, accelerating the wear and failure of the sealing surface and reducing the valve's service life. Existing technologies mainly avoid this by improving the machining accuracy of the valve seat, valve plug, and ball gasket, as well as the assembly process, but this increases costs and cannot completely eliminate this asymmetric contact stress. Utility Model Content

[0003] The purpose of this invention is to provide a valve ball and valve stem connection structure and a ball valve to solve the above problems, so as to achieve automatic alignment of the valve stem and valve ball after assembly, ensuring that the valve stem and valve ball are aligned and coaxial.

[0004] To achieve the above objectives, this utility model provides the following solution: a valve ball and valve stem connection structure, including a valve ball and a valve stem, wherein a valve ball groove is provided on the top of the valve ball, and a valve stem lower flat plate is fixedly connected to the bottom of the valve stem, and a deflectable connecting pair is provided between the valve ball groove and the valve stem lower flat plate for deflecting the valve stem and the valve ball.

[0005] Preferably, the deflectable connecting pair includes a bottom arc block and two sets of arc blocks. The two arc blocks are respectively fixedly connected to the two opposite side walls of the lower flat part of the valve stem. The bottom arc block is fixedly connected to the bottom of the lower flat part of the valve stem. The arc surface of the bottom arc block smoothly transitions with the arc surfaces of the two arc blocks. The arc surfaces of the two arc blocks respectively abut against the two opposite side walls of the valve ball groove.

[0006] Preferably, the deflectable connecting pair includes a bottom arc block and two sets of arc blocks. The two arc blocks are respectively fixedly connected to the two opposite side walls of the lower flat part of the valve stem. The bottom arc block is fixedly connected to the bottom of the lower flat part of the valve stem. The arc surface of the bottom arc block smoothly transitions with the arc surface of the two arc blocks.

[0007] It also includes two sets of arc-shaped grooves, which are respectively opened on the two opposite side walls of the valve ball groove, and the arc surfaces of the two arc blocks abut against the arc-shaped grooves.

[0008] Preferably, the arc surface of the arc block is adapted to the arc surface of the arc groove.

[0009] Preferably, the deflectable connecting pair includes two sets of bosses, the two bosses are respectively fixedly connected to the two opposite side walls of the lower flat part of the valve stem, and a small plane is opened at the end of the boss away from the lower flat part of the valve stem, and the two small planes abut against the two opposite side walls of the valve ball groove.

[0010] A ball valve includes a valve seat, in which a valve stem nut and a ball washer are disposed, and the aforementioned valve ball and valve stem connection structure is disposed between the valve stem nut and the ball washer.

[0011] Compared with the prior art, the present invention has the following advantages and technical effects: Overall, the present invention, by setting a deflectable connecting pair at the connection between the valve stem and the valve ball, reduces the contact area between the valve stem and the valve ball, allowing a small angle of deflection between them. Without requiring excessively high machining precision, the valve stem can automatically align after assembly, ensuring that the valve stem and the valve ball are aligned and coaxial. This eliminates the asymmetric contact stress generated at the contact point between the valve stem and the ball valve seat, reduces rotational torque, and can also indirectly improve the sealing life and enhance the stability of the ball valve in use. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the deflectable connection pair according to Embodiment 1 of this utility model;

[0014] Figure 2 This is a schematic diagram of the deflectable connection pair according to Embodiment 2 of this utility model;

[0015] Figure 3 This is a schematic diagram of the deflectable connection pair according to Embodiment 3 of this utility model;

[0016] Figure 4 This utility model provides a ball valve comprising the deflectable connecting pair of Embodiment 1;

[0017] Among them, 1. Valve ball; 2. Valve stem; 3. Valve ball groove; 4. Lower flat part of valve stem; 5. Arc block; 6. Bottom arc block; 7. Arc groove; 8. Boss; 9. Small plane; 10. Valve seat; 11. Valve stem nut; 12. Ball gasket; 13. Valve stem gasket; 14. Valve plug; 15. Valve stem packing. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Reference Figures 1-3 This utility model provides a valve ball and valve stem connection structure, including a valve ball 1 and a valve stem 2. The top of the valve ball 1 is provided with a valve ball groove 3, and the bottom of the valve stem 2 is fixedly connected with a lower valve stem flat 4. A deflectable connection pair is provided between the valve ball groove 3 and the lower valve stem flat 4 for deflecting the valve stem 2 and the valve ball 1.

[0021] The main function of the deflectable connection pair is to reduce the contact area between the valve stem and the ball valve, so that the valve stem and the ball valve can be deflected at a small angle. After assembly, since the valve stem can be deflected relative to the ball valve, the valve stem can automatically align itself, ensuring that the valve stem and the ball valve are aligned and coaxial, thereby eliminating the asymmetric contact stress generated at the contact area between the valve stem and the ball valve seat and reducing the rotational torque.

[0022] Example 1:

[0023] The deflectable connecting pair includes a bottom arc block 6 and two sets of arc blocks 5. The two arc blocks 5 are fixedly connected to the two opposite side walls of the lower flat part 4 of the valve stem, and the bottom arc block 6 is fixedly connected to the bottom of the lower flat part 4 of the valve stem. The arc surface of the bottom arc block 6 smoothly transitions with the arc surface of the two arc blocks 5, and the arc surface of the two arc blocks 5 abuts against the two opposite side walls of the valve ball groove 3.

[0024] like Figure 1 As shown, the bottom arc block 6, arc block 5, lower flat part of valve stem 4, and valve stem 2 are integrally formed structures. Due to the setting of two sets of arc blocks 5, the arc surface of the arc block 5 can present a line contact with the vertical side wall of the valve ball groove 3. Compared with the conventional surface contact between the lower flat part of valve stem 4 and valve ball groove 3, the valve stem 2 can easily deflect in the valve ball groove 3. Thus, after assembly, the valve stem 2 deflects relative to the valve ball 1, which can achieve automatic alignment between the two, thereby reducing the torque of the valve stem 2.

[0025] Example 2:

[0026] The deflectable connecting pair includes a bottom arc block 6 and two sets of arc blocks 5. The two arc blocks 5 are fixedly connected to the two opposite side walls of the lower flat part 4 of the valve stem, and the bottom arc block 6 is fixedly connected to the bottom of the lower flat part 4 of the valve stem. The arc surface of the bottom arc block 6 and the arc surface of the two arc blocks 5 are smoothly connected.

[0027] It also includes two sets of arc grooves 7, which are respectively opened on the two opposite side walls of the valve ball groove 3, and the arc surfaces of the two arc blocks 5 abut against the arc grooves 7.

[0028] The design was further optimized so that the arc surface of the arc block 5 is adapted to the arc surface of the arc groove 7.

[0029] like Figure 2 As shown, the bottom arc block 6, the arc block 5, the lower flat part of the valve stem 4, and the valve stem 2 are integrally formed. The arc block 5 and the arc groove 7 have the same curvature and are in a compatible state, so that the arc surface of the arc block 5 and the arc surface of the arc groove 7 have a certain surface contact, but still ensure that the valve stem 2 deflects relative to the valve ball 1. Thus, after assembly, the valve stem 2 deflects relative to the valve ball 1, which can realize the automatic alignment of the two and reduce the torque of the valve stem 2.

[0030] The contact between the arc block 5 and the arc groove 7 can reduce contact stress and extend the service life of the valve stem 2 and the valve ball 1.

[0031] Example 3:

[0032] The scheme is further optimized. The deflectable connecting pair includes two sets of bosses 8. The two bosses 8 are fixedly connected to the two opposite side walls of the lower flat 4 of the valve stem. The end of the boss 8 away from the lower flat 4 of the valve stem has a small plane 9. The two small planes 9 abut against the two opposite side walls of the valve ball groove 3.

[0033] like Figure 3 As shown, the boss 8, the small plane 9, the lower flat part of the valve stem 4, and the valve stem 2 are integrally formed. The boss 8 has a trapezoidal structure, and the end away from the lower flat part of the valve stem 4 has a small plane 9. Through the contact between the small plane 9 and the side wall of the valve ball groove 3, the contact area can be reduced, making it easier for the valve stem 2 to deflect relative to the valve ball 1, thus achieving automatic alignment between the valve stem 2 and the valve ball 1.

[0034] Example 4:

[0035] A ball valve includes a valve seat 10, in which a valve stem nut 11 and a ball washer 12 are disposed, and the aforementioned valve ball and valve stem connection structure is disposed between the valve stem nut 11 and the ball washer 12.

[0036] like Figure 4 As shown, the deflectable connection between valve stem 2 and valve ball 1 adopts the form of Embodiment 1.

[0037] A ball pad 12 is provided inside the valve seat 10, and the valve ball 1 is rotatably connected between the ball pads 12. A valve stem nut 11 is threadedly connected to the top of the valve seat 10, and the valve stem 2 is rotatably connected inside the valve stem nut 11. The lower flat part 4 of the valve stem is inserted into the valve ball groove 3. A valve stem packing 15 is also fixedly connected inside the valve seat 10, and the valve stem packing 15 is sleeved on the valve stem 2. A valve stem gasket 13 abuts against the valve seat 10 at the end of the valve stem 2 near the valve ball 1. Valve plugs 14 are detachably connected to the inlet and outlet ends of the valve seat 10, and the valve ball 1 abuts against the two valve plugs 14 through the ball pads 12.

[0038] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0039] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A valve ball and valve stem connection structure, comprising a valve ball (1) and a valve stem (2), wherein the top of the valve ball (1) is provided with a valve ball groove (3), and the bottom of the valve stem (2) is fixedly connected with a valve stem lower flat section (4), characterized in that, A deflectable connecting pair is provided between the valve ball groove (3) and the lower flat part of the valve stem (4) for deflecting the valve stem (2) and the valve ball (1).

2. The valve ball and valve stem connection structure according to claim 1, characterized in that: The deflectable connecting pair includes a bottom arc block (6) and two sets of arc blocks (5). The two arc blocks (5) are respectively fixedly connected to the two opposite side walls of the lower flat part (4) of the valve stem. The bottom arc block (6) is fixedly connected to the bottom of the lower flat part (4) of the valve stem. The arc surface of the bottom arc block (6) smoothly transitions with the arc surface of the two arc blocks (5). The arc surface of the two arc blocks (5) abuts against the two opposite side walls of the valve ball groove (3).

3. The valve ball and valve stem connection structure according to claim 1, characterized in that: The deflectable connecting pair includes a bottom arc block (6) and two sets of arc blocks (5). The two arc blocks (5) are respectively fixedly connected to the two opposite side walls of the lower flat part (4) of the valve stem. The bottom arc block (6) is fixedly connected to the bottom of the lower flat part (4) of the valve stem. The arc surface of the bottom arc block (6) and the arc surface of the two arc blocks (5) are smoothly connected. It also includes two sets of arc grooves (7), the two arc grooves (7) are respectively opened on the two opposite side walls of the valve ball groove (3), and the arc surfaces of the two arc blocks (5) abut against the arc grooves (7).

4. The valve ball and valve stem connection structure according to claim 3, characterized in that: The arc surface of the arc block (5) is adapted to the arc surface of the arc groove (7).

5. The valve ball and valve stem connection structure according to claim 1, characterized in that: The deflectable connector includes two sets of bosses (8), which are fixedly connected to the two opposite side walls of the lower flat part (4) of the valve stem. A small plane (9) is provided at the end of the boss (8) away from the lower flat part (4) of the valve stem, and the two small planes (9) abut against the two opposite side walls of the valve ball groove (3).

6. A ball valve, characterized in that, include: A valve seat (10) is provided with a valve stem nut (11) and a ball washer (12) inside the valve seat (10), and the valve ball and valve stem connection structure according to any one of claims 1-5 is provided between the valve stem nut (11) and the ball washer (12).

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