Valve connecting mechanism, valve driving device and automatic control valve

Abstract

The utility model relates to the technical field of valve control, in particular to a valve connecting mechanism, a valve driving device and an automatic control valve. The valve connecting mechanism is used for connecting an actuator and a valve and comprises a shell connecting structure and a valve rod transmission structure. The shell connecting structure is used for fixedly connecting the flange of the actuator with the valve cover of the valve and is adaptive to the valve covers with different outer diameters; the valve rod transmission structure is located in the shell connecting structure and comprises an automatic clamping assembly connected with the outer hexagons of the valve rod nuts of different sizes in a matched mode and a valve rod transmission input end connected with the output end of the actuator. According to the connecting mechanism, automatic adaptive transmission connection with valve rod nuts of different specifications is achieved, connection of shells of different specifications is achieved, the application range of the connecting mechanism is widened, and each type of manual valve does not need to be independently provided with one connecting mechanism.

Description

Technical Field

[0001] This utility model relates to the technical field of valve control, specifically to a valve connection mechanism, a valve drive device, and an automatic control valve. Background Technology

[0002] Valves are classified into several types according to their actuation method, including manual, electric, hydraulic, and pneumatic, with manual valves being the most widely used. As energy extraction becomes increasingly challenging, and the requirements for ease of on-site management, control precision, and personnel safety become more stringent, the advantages of electric actuation are becoming increasingly apparent. There is a pressing need to upgrade the level of electric automation for the large number of manual valves in use at well sites and stored in warehouses. Valves are standardized products, especially gate valves and throttle valves widely used in the field; different specifications and types of valves have similar structures. The valve stem and bonnet are the main pressure-bearing components, connected by flanges, with the bonnet typically being a circular flange. The majority of valve actuation is achieved through the trapezoidal thread between the valve stem nut and the valve stem, with a hexagonal drive mechanism on the valve stem nut. However, due to the numerous series of nominal valve sizes and pressure ratings, variations in valve bonnet size, valve stem nut size, and valve stem length, equipping each valve with a dedicated electric drive unit is costly and difficult to implement. Utility Model Content

[0003] This utility model addresses one of the problems in the prior art by providing a valve connection mechanism, a valve drive device, and an automatic control valve.

[0004] The technical solution is as follows:

[0005] A valve connection mechanism for connecting an actuator to a valve, comprising a housing connection structure and a valve stem transmission structure;

[0006] The housing connection structure is used to fix the flange of the actuator to the valve cover, and is adapted to valve covers with different outer diameters;

[0007] The valve stem drive structure, located inside the housing connection structure, includes an automatic clamping assembly that is hexagonally adapted to valve stem nuts of different sizes and a valve stem drive input end connected to the output end of the actuator.

[0008] The working principle and beneficial effects of this utility model are as follows: The connection mechanism of this application realizes automatic adaptation and transmission connection with valve stem nuts of different specifications by means of a housing connection structure that adapts to valve covers of different outer diameters and an automatic clamping component that adapts to the hexagonal fit of valve stem nuts of different sizes, as well as the connection of housings of different specifications. This improves the applicability of the connection mechanism and eliminates the need to configure a separate connection mechanism for each type of manual valve.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the housing connection structure includes a valve cover connection end and an actuator connection end. The actuator connection end is fixedly connected to the flange. The inner hole of the valve cover connection end is larger than the outer diameter of the valve cover. The valve cover connection end is provided with a valve cover locking mechanism for locking the housing connection structure onto the valve cover.

[0011] The beneficial effect of adopting the above-mentioned further solution is that the valve cover locking mechanism at the valve cover connection end can adapt to and lock valve covers of different sizes.

[0012] Based on the above technical solution, the present invention can be further improved as follows.

[0013] Furthermore, the valve cover locking mechanism includes a threaded hole and a bolt. The threaded hole is located radially on the valve cover connection end, and the bolt is screwed into the threaded hole.

[0014] The advantages of adopting the above-mentioned further solution are: the connection method using threaded locking is simple and reliable.

[0015] Based on the above technical solution, the present invention can be further improved as follows.

[0016] Furthermore, there are multiple bolts, and each bolt has a scale.

[0017] The beneficial effect of adopting the above-mentioned further solution is that multiple bolts are marked with graduations, and during installation, the graduations on each bolt are located in the same position, ensuring that the axis of the housing connection structure is consistent with the axis of the valve stem.

[0018] Based on the above technical solution, the present invention can be further improved as follows.

[0019] Furthermore, the automatic clamping assembly includes an inner sleeve, a conical sleeve, and an outer sleeve;

[0020] The inner sleeve has a hexagonal connecting section and an outer connecting section. The inner diameter of the hexagonal connecting section is larger than the outer diameter of the hexagon, and it has multiple through holes in its radial direction corresponding to the hexagon. Each through hole has a locking pin that slides elastically, and the locking pin can abut against the plane of the hexagon.

[0021] The tapered sleeve has a tapered section and an inner sleeve connecting section. The inner sleeve connecting section is axially slidably fitted onto the hexagonal connecting section. The tapered section has an inner tapered surface. The small end of the inner tapered surface is close to the inner sleeve connecting section, and the inner tapered surface abuts against the locking pin.

[0022] The outer sleeve has a tapered connecting section and the valve stem drive input end. The tapered connecting section is axially slidably fitted onto the outer sleeve connecting section. The tapered connecting section and the inner sleeve connecting section are spaced apart and elastically connected by a first elastic component. The end face of the outer sleeve connecting section is spaced apart from the outer sleeve and elastically connected by a second elastic component.

[0023] The beneficial effects of adopting the above-mentioned further solution are as follows: by setting the above-mentioned nested structure and combining it with the function of the elastic component, the automatic clamping assembly achieves the hexagonal clamping effect; at the same time, since the elastic connection is set, it can be adapted to valve stems of different lengths. When the cone sleeve is pushed to move, the cone sleeve pushes the locking pin to move towards the center through the cone surface section. The principle is to use the inclined surface to convert the thrust on the cone sleeve into the thrust of the pin. Its structure belongs to the wedge clamping structure, which is simple in structure, has a force-increasing effect, and can have a self-locking characteristic under the premise of a certain cone angle. That is, when the thrust is removed, the pin is subjected to the reverse force, which will not push the cone sleeve to move and cause the locking pin to loosen the clamping of the hexagonal nut.

[0024] Furthermore, it also includes a third elastic component, which is sleeved on the locking pin to enable the locking pin to slide elastically within the through hole. The elastic coefficient of the first elastic component is greater than that of the third elastic component.

[0025] The beneficial effect of adopting the above-mentioned further solution is that when the elastic coefficient of the first elastic component is greater than that of the third elastic component, after applying a thrust to the outer sleeve, the thrust generated by the first elastic component can push the third elastic component through the inner conical surface of the conical sleeve, ensuring that the locking pin effectively abuts against the hexagonal plane.

[0026] Based on the above technical solution, the present invention can be further improved as follows.

[0027] Furthermore, the inner sleeve is detachably provided with a valve stem sleeve that matches the outer diameter of the valve stem, and the valve stem sleeve has a transition chamfer at the inner diameter near the valve stem nut.

[0028] The beneficial effects of adopting the above-mentioned further solution are: during installation, after the valve stem sleeve abuts against the valve stem nut, it ensures that the locking pin and the hexagon are in the same position, thus achieving the positioning of the locking pin and the hexagon; at the same time, a transition chamfer is set to reduce the friction between the valve stem sleeve and the valve stem during the movement.

[0029] Based on the above technical solution, the present invention can be further improved as follows.

[0030] Furthermore, the outer surface of the inner sleeve is a non-cylindrical surface structure or is provided with an axial guide structure.

[0031] The beneficial effects of adopting the above-mentioned further solution are: the outer surface of the non-cylindrical inner sleeve ensures that the matching tapered sleeve and outer sleeve can slide in its axial direction and is well limited to rotation perpendicular to the axial direction, thus improving reliability; at the same time, the axial guide mechanism can be provided with guide grooves or guide pins, and the matching tapered sleeve and outer sleeve can also achieve reliable axial sliding by providing guide pins or guide grooves, while limiting radial rotation.

[0032] This utility model also provides a valve driving device, including an actuator and a valve connection mechanism. The valve connection mechanism is the valve connection mechanism described above. The actuator has an output end and a flange. The output end is connected to the valve stem drive input end. The flange is fixedly connected to the housing connection structure.

[0033] The beneficial effect of this valve drive device is that by setting the above-mentioned valve connection mechanism, the drive of valves of different specifications can be realized through the actuator.

[0034] Based on the above technical solution, the present invention can be further improved as follows.

[0035] Furthermore, the actuator is a hydraulic actuator, a pneumatic actuator, or an electric actuator.

[0036] The advantage of adopting the above-mentioned further solution is that different actuators can be selected according to different application conditions.

[0037] This utility model also provides an automatic control valve, including a valve and a valve drive device, wherein the valve drive device is the aforementioned valve drive device, and the valve has a valve cover and a valve stem nut.

[0038] The housing connection structure is fixedly connected to the valve cover, and the outer hexagon of the valve stem nut is connected to the automatic clamping assembly.

[0039] The beneficial effect of this utility model of automatic control valve is that it achieves the effect of automatic valve control. Attached Figure Description

[0040] Figure 1 This is a sectional view of Embodiment 1 of the valve connection mechanism of this utility model;

[0041] Figure 2 This is a cross-sectional view of the valve stem transmission structure in Embodiment 1;

[0042] Figure 3 This is a cross-sectional view of Embodiment 1 of the valve drive device of this utility model;

[0043] Figure 4 This is an overall appearance view of Embodiment 1 of the valve drive device;

[0044] Figure 5 This is a schematic diagram of the split structure of the automatic control valve of this utility model, Embodiment 1;

[0045] Figure 6 This is a cross-sectional view of an embodiment of the automatic control valve of this utility model;

[0046] Figure 7 This is a first-state diagram of the assembly process of the automatic control valve embodiment of this utility model;

[0047] Figure 8 This is a second state diagram of the assembly process of Embodiment 1 of the automatic control valve of this utility model;

[0048] Figure 9 This is the third state diagram of the assembly process of Embodiment 1 of the automatic control valve of this utility model.

[0049] The attached diagram lists the components represented by each number as follows:

[0050] 1. Housing connection structure; 11. Valve cover connection end; 12. Actuator connection end; 13. Bolt; 14. Threaded hole; 2. Valve stem transmission structure; 21. Valve stem transmission input end; 22. Automatic clamping assembly; 3. Inner sleeve; 31. Hexagonal connecting section; 32. Outer sleeve connecting section; 33. Through hole; 34. Locking pin; 35. Third elastic component; 36. Retaining ring; 4. Conical sleeve; 41. Conical surface section; 42. Inner sleeve connecting section; 43. Inner conical surface; 44. Conical sleeve locking screw; 5. Outer sleeve; 51. Conical sleeve connecting section; 52. First elastic component; 53. First pin; 54. Second elastic component; 55. Second pin; 6. Valve stem sleeve; 7. Actuator; 71. Motor; 72. Output end; 73. Flange; 74. Handwheel; 8. Valve; 81. Valve cover; 82. Valve stem nut; 83. Valve stem. Detailed Implementation

[0051] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0052] See the structural schematic diagram of Embodiment 1 of the valve connection mechanism of this utility model. Figures 1 to 2 .

[0053] A valve connection mechanism for connecting actuator 7 and valve 8 includes a housing connection structure 1 and a valve stem drive structure 2.

[0054] The housing connection structure 1 is used to fix the flange 73 of the actuator 7 to the valve cover 81 of the valve 8, and is adapted to valve covers 81 with different outer diameters.

[0055] The valve stem drive structure 2 is located inside the housing connection structure 1. It includes an automatic clamping assembly 22 that is adapted to the hexagonal fit of valve stem nuts 82 of different sizes and a valve stem drive input end 21 that is connected to the output end 72 of the actuator 7.

[0056] Specifically, the housing connection structure 1 includes a valve cover connection end 11 and an actuator connection end 12. The actuator connection end 12 is fixedly connected to the flange 73. The inner hole of the valve cover connection end 11 is larger than the outer diameter of the valve cover 81. The valve cover connection end 11 is provided with a valve cover locking mechanism for locking the housing connection structure 1 onto the valve cover 81.

[0057] The valve cover locking mechanism includes a threaded hole 14 and a bolt 13. The threaded hole 14 is located radially on the valve cover connecting end 11, and the bolt 13 is screwed into the threaded hole 14. The bolts 13 are provided with graduations.

[0058] For the connection between the housing connection structure 1 and the valve cover 81, the valve cover connection end 11 is fitted onto the valve cover 81 of the valve 8, and multiple bolts 13 are rotated and adjusted to ensure that the scale on each bolt 13 is consistent. Because the size and specifications of the bolts 13 are consistent, the screw length of each bolt 13 is also consistent, and the distance between the valve cover connection end 11 and the valve cover 81 is also consistent at all positions, ensuring that the axis of the housing connection structure 1 is consistent with the axis of the valve stem 83.

[0059] The inner diameter of the valve cover connection end 11 is larger than the outer diameter of the valve cover 81, ensuring that the valve cover connection end 11 can be adapted to valve covers 81 of different specifications and sizes, thus improving product compatibility. The actuator connection end 12 can also be configured with different sizes to accommodate actuators 7 of different specifications and types.

[0060] like Figure 2 As shown, the automatic clamping assembly 22 includes an inner sleeve 3, a conical sleeve 4, and an outer sleeve 5.

[0061] The inner sleeve 3 has a hexagonal connecting section 31 and an outer connecting section 32. The inner diameter of the hexagonal connecting section 31 is larger than the outer diameter of the hexagon, and it has multiple through holes 33 corresponding to the hexagon in its radial direction. Each through hole 33 has a locking pin 34 that can slide elastically. The locking pin 34 can abut against the plane of the hexagon. A retaining ring 36 is provided inside the inner sleeve 3 where the locking pin 34 is located. In this embodiment, the locking pin 34 is provided with a third elastic component 35. One end of the third elastic component 35 abuts against the outer side of the hexagonal connecting section 31, and the other end abuts against the flange of the locking pin 34.

[0062] The tapered sleeve 4 has a tapered section 41 and an inner sleeve connecting section 42. The inner sleeve connecting section 42 is axially slidably fitted onto the hexagonal connecting section 31. The tapered section 41 has an inner tapered surface 43. The small end of the inner tapered surface 43 is close to the inner sleeve connecting section 42, and the inner tapered surface 43 abuts against the locking pin 34. The inner sleeve connecting section 42 is provided with a plurality of tapered sleeve locking screws 44 for locking the tapered sleeve 4 onto the inner sleeve 3.

[0063] The outer sleeve 5 has a tapered connecting section 51 and a valve stem drive input end 21. The tapered connecting section 51 is axially slidably fitted onto the outer sleeve connecting section 32. The tapered connecting section 51 and the inner sleeve connecting section 42 are spaced apart and elastically connected by a first elastic member 52. A first pin 53 is fixedly installed on the inner sleeve connecting section 42. The tapered connecting section 51 has a countersunk hole to accommodate the first elastic member 52. The first elastic member 52 is fitted onto the first pin 53, and its two ends abut against the inner sleeve connecting section 42 and the tapered connecting section 51, respectively. The end face of the outer sleeve connecting section 32 is spaced apart from the outer sleeve 5 and elastically connected by a second elastic member 54. A second pin 55 is fixedly installed on the valve stem drive input end 21. The outer sleeve connecting section 32 has a countersunk hole to accommodate the second elastic member 54. The second elastic member 54 is fitted onto the second pin 55, and its two ends abut against the outer sleeve connecting section 32 and the outer sleeve 5, respectively. In this embodiment, the valve stem drive input end 21 is configured as a hexagonal structure, which is used to adapt and drive the connection with the hexagonal structure inside the output end 72 of the actuator 7.

[0064] In this embodiment, a valve stem sleeve 6, matching the outer diameter of the valve stem 83, is detachably provided inside the inner sleeve 3. The valve stem sleeve 6 has a transition chamfer near the inner diameter of the valve stem nut 82. That is, the valve stem sleeve 6 is screwed and locked into the through hole 33 inside the inner sleeve 3 via an external thread. Figure 2 The valve stem sleeve 6 shown has a chamfered transition at its left end. This ensures that when the valve stem sleeve 6 is fitted onto the valve stem 83 and moves, it can move smoothly on the valve stem 83 without being jammed by the threads on the valve stem 83. The length of the valve stem sleeve 6 is selected according to the actual application of the mechanism. During installation, it is ensured that after the valve stem sleeve 6 abuts against the valve stem nut 82, the locking pin 34 aligns with the hexagonal position, thus achieving locking pin 34 and hexagonal positioning.

[0065] In this embodiment, the outer surface of the inner sleeve 3 is a hexagonal structure, while the inner surfaces of the tapered sleeve 4 and the outer sleeve 5 are also configured with matching hexagonal holes. This ensures that the matching tapered sleeve 4 and outer sleeve 5 can slide axially and are well limited to rotation perpendicular to the axial direction, resulting in high reliability. Other methods can also be used to achieve axial sliding while limiting rotation perpendicular to the axial direction. For example, a guide pin can be provided on the outer surface of the inner sleeve 3, and matching guide groove structures can be provided on the inner surfaces of the tapered sleeve 4 and the outer sleeve 5; or, a guide groove can be provided on the outer surface of the inner sleeve 3, and matching guide pin structures can be provided on the inner surfaces of the tapered sleeve 4 and the outer sleeve 5.

[0066] The installation process of the valve stem transmission structure 2 is as follows: Select a suitable valve stem sleeve 6 and install it inside the inner sleeve 3. Place the valve stem sleeve 6 on the valve stem 83. Push the outer sleeve 5 to move the entire valve stem transmission structure 2 towards the hexagonal part of the valve stem nut 82. After the valve stem sleeve 6 abuts against the valve stem nut 82, observe whether the position of the locking pin 34 is aligned with the outer hexagonal part of the valve stem nut 82. If it is not aligned, adjust the position of the valve stem sleeve 6 inside the inner sleeve 3 according to the relative position until the position of the locking pin 34 is aligned with the outer hexagonal part of the valve stem nut 82. The locking pin 34 and the hexagonal part are now positioned. Finally, tighten the tapered sleeve locking screw 44 to lock the tapered sleeve 4 onto the inner sleeve 3. In the installation process of this embodiment, in order to prevent the locking pin 34 from moving towards the hexagonal part prematurely, the tapered sleeve locking screw 44 can be tightened before pushing the outer sleeve 5 to move. After positioning, loosen the tapered sleeve locking screw 44 so that the locking pin 34 abuts against the outer hexagonal part of the valve stem nut 82.

[0067] In this embodiment, the elastic coefficient of the first elastic component 52 is greater than that of the third elastic component 35. After applying a thrust to the outer sleeve 5, the thrust generated by the first elastic component 52 can push the third elastic component 35 through the inner conical surface 43 of the conical sleeve 4, ensuring that the locking pin 34 effectively abuts against the hexagonal plane.

[0068] See the structural schematic diagram of Embodiment 1 of the valve actuation device of this utility model. Figures 3 to 4 It includes an actuator 7 and a valve connection mechanism. The valve connection mechanism is the valve connection mechanism described above. The actuator 7 has an output end 72 and a flange 73. The output end 72 is connected to the valve stem drive input end 21 for transmission, and the flange 73 is fixedly connected to the housing connection structure 1.

[0069] like Figure 3As shown, the valve stem drive input end 21 is configured with a hexagonal structure, which is adapted to the hexagonal structure inside the output end 72 of the actuator 7 for transmission connection; the actuator connection end 12 is fixedly connected to the flange 73 by screws (not shown in the figure). The rotation of the output end 72 of the actuator 7 drives the outer sleeve 5 to rotate. Since the outer sleeve 5 and the inner sleeve 3 do not move relative to each other in the radial direction, the inner sleeve 3 is further driven to rotate. Similarly, the inner sleeve 3 drives the cone sleeve 4 to rotate. That is to say, the actuator 7 drives the entire valve stem drive structure 2 to rotate, thereby transmitting torque to the valve stem nut 82 of the valve 8, realizing the actuator 7's drive of the valve 8.

[0070] In this embodiment, the actuator 7 is an electric actuator 7, the main component of which is a motor 71. It is also equipped with a manual drive mechanism handwheel 74, which can drive the actuator 7 normally when the electric drive fails.

[0071] In specific embodiments, different types of actuators 7 are selected according to different application conditions. For example, in application scenarios that require larger torque, hydraulic actuators 7 can be selected.

[0072] See the structural diagram of Embodiment 1 of the automatic control valve of this utility model. Figures 5 to 6 It includes a valve 8 and a valve drive device. The valve drive device is the valve drive device described above. The valve 8 has a valve cover 81 and a valve stem nut 82. The housing connection structure 1 is fixedly connected to the valve cover 81, and the outer hexagon of the valve stem nut 82 is connected to the automatic clamping assembly 22.

[0073] like Figure 5 As shown, valve 8 has a valve cover 81, a valve stem nut 82 on the valve stem 83, and four bolts 13 on the valve cover connecting end 11 for locking the housing connecting structure 1 to the valve cover 81. Figure 6 As shown, after the automatic clamping assembly 22 of the valve stem transmission structure 2 is locked and connected to the valve stem nut 82, the locking pin 34 abuts against the hexagon of the valve stem nut 82, and the inner conical surface 43 of the tapered sleeve 4 abuts against the locking pin 34; at the same time, the tapered sleeve locking screw 44 is also locked to the inner sleeve 3.

[0074] The installation process of the automatic control valve in this embodiment is described in the following instructions. Figures 7 to 9 ,like Figure 7As shown, select a suitable valve stem sleeve 6 and install it inside the inner sleeve 3. Place the valve stem sleeve 6 onto the valve stem 83. Push the outer sleeve 5 to move the entire valve stem transmission structure 2 towards the hexagonal part of the valve stem nut 82. After the valve stem sleeve 6 abuts against the valve stem nut 82, observe whether the position of the locking pin 34 is aligned with the outer hexagonal part of the valve stem nut 82. If not aligned, adjust the position of the valve stem sleeve 6 within the inner sleeve 3 according to the relative position until the locking pin 34 is aligned with the outer hexagonal part of the valve stem nut 82. The locking pin 34 and the hexagonal part are now positioned. Finally, tighten the tapered sleeve locking screw 44 to lock the tapered sleeve 4 onto the inner sleeve 3. It should be noted that, in this embodiment, the valve stem nut 82, in addition to its hexagonal structure, also has other outer cylindrical structures at both ends of the hexagon. In this embodiment, the abutment position of the valve stem sleeve 6 and the valve stem nut 82 is located at the end face of the outer cylinder of the valve stem nut 82.

[0075] like Figure 8 As shown, the housing connection structure 1 is fixedly connected to the valve cover 81 by four bolts 13, which lock the housing connection structure 1 onto the valve cover 81 of the valve 8. Figure 9 As shown, the output end 72 of the actuator 7 is connected to the valve stem drive input end 21 of the valve stem drive structure 2.

[0076] After matching and connecting, push actuator 7. The actuator will move along with outer sleeve 5, compressing the first elastic component 52 until actuator connection end 12 abuts against flange 73. Install and tighten the connecting bolts between actuator connection end 12 and flange 73. Then, loosen tapered sleeve locking screw 44. The first elastic component 52 will push tapered sleeve 4 to move, and inner tapered surface 43 will press locking pin 34 against hexagonal surface. Finally, tighten tapered sleeve locking screw 44. After locking and installation are complete, Figure 6 The structure shown.

[0077] In this embodiment, when the cone sleeve 4 is pushed to move, the cone sleeve 4 pushes the locking pin 34 to move towards the center through the cone surface section 41. The principle is to use the inclined surface to convert the pushing force on the cone sleeve 4 into the pushing force on the locking pin 34. Its structure belongs to the inclined wedge clamping structure, which is simple in structure, has the function of force amplification, and can have self-locking characteristics under the premise of limiting a certain cone angle. That is, when the pushing force is removed, the pin is subjected to the reverse force, and will not push the cone sleeve 4 to move, causing the locking pin 34 to loosen the clamping of the hexagonal nut.

[0078] In this embodiment, since the outer sleeve 5 and the conical sleeve 4 are elastically connected, they have a relatively long adjustable range; similarly, the outer sleeve 5 and the inner sleeve 3 are also elastically connected, and thus also have a relatively long adjustable range. Figure 6 As shown, after installation and assembly, the valve stem 83 is still a considerable distance from the valve stem drive input end 21. At the same time, the two elastic components also have an adjustable distance, achieving good matching for valve stems 83 of different lengths.

[0079] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A valve connection mechanism for connecting an actuator to a valve, characterized in that, This includes the housing connection structure and the valve stem drive structure; The housing connection structure is used to fix the flange of the actuator to the valve cover, and is adapted to valve covers with different outer diameters; The valve stem drive structure is located inside the housing connection structure and includes an automatic clamping assembly that is adapted to connect with the hexagonal valve stem nuts of different sizes and a valve stem drive input end connected to the output end of the actuator. The automatic clamping assembly includes an inner sleeve, a conical sleeve, and an outer sleeve; The inner sleeve has a hexagonal connecting section and an outer connecting section. The inner diameter of the hexagonal connecting section is larger than the outer diameter of the hexagon, and it has multiple through holes in its radial direction corresponding to the hexagon. Each through hole has a locking pin that slides elastically, and the locking pin can abut against the plane of the hexagon. The tapered sleeve has a tapered section and an inner sleeve connecting section. The inner sleeve connecting section is axially slidably fitted onto the hexagonal connecting section. The tapered section has an inner tapered surface. The small end of the inner tapered surface is close to the inner sleeve connecting section, and the inner tapered surface abuts against the locking pin. The outer sleeve has a tapered connecting section and the valve stem drive input end. The tapered connecting section is axially slidably fitted onto the outer sleeve connecting section. The tapered connecting section and the inner sleeve connecting section are spaced apart and elastically connected by a first elastic component. The end face of the outer sleeve connecting section is spaced apart from the outer sleeve and elastically connected by a second elastic component.

2. The valve connection mechanism according to claim 1, characterized in that, The housing connection structure includes a valve cover connection end and an actuator connection end. The actuator connection end is fixedly connected to the flange. The inner hole of the valve cover connection end is larger than the outer diameter of the valve cover. The valve cover connection end is provided with a valve cover locking mechanism for locking the housing connection structure onto the valve cover.

3. The valve connection mechanism according to claim 2, characterized in that, The valve cover locking mechanism includes a threaded hole and a bolt. The threaded hole is located radially on the valve cover connection end, and the bolt is screwed into the threaded hole.

4. A valve connection mechanism according to claim 3, characterized in that, There are multiple bolts, and each bolt has a scale.

5. A valve connection mechanism according to claim 1, characterized in that, It also includes a third elastic component, which is sleeved on the locking pin to enable the locking pin to slide elastically within the through hole. The elastic coefficient of the first elastic component is greater than that of the third elastic component.

6. A valve connection mechanism according to claim 1, characterized in that, The inner sleeve is detachably provided with a valve stem sleeve that matches the outer diameter of the valve stem, and the valve stem sleeve has a transition chamfer at the inner diameter near the valve stem nut.

7. A valve connection mechanism according to any one of claims 1-6, characterized in that, The outer surface of the inner sleeve is a non-cylindrical surface structure or has an axial guide structure.

8. A valve driving device, comprising an actuator and a valve connection mechanism, characterized in that, The valve connection mechanism is the valve connection mechanism according to any one of claims 1 to 7, the actuator has an output end and a flange, the output end is connected to the valve stem drive input end, and the flange is fixedly connected to the housing connection structure.

9. A valve driving device according to claim 8, characterized in that, The actuator is a hydraulic actuator, a pneumatic actuator, or an electric actuator.

10. An automatic control valve, comprising a valve and a valve actuation device, characterized in that... The valve actuation device is the valve actuation device according to claim 8 or 9, and the valve has a valve cover and a valve stem nut. The housing connection structure is fixedly connected to the valve cover, and the outer hexagon of the valve stem nut is connected to the automatic clamping assembly.

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