A valve connection mechanism, a valve driving device and an automatic control valve

Abstract

The present invention relates to the technical field of valve control, and specifically to a valve connection mechanism, a valve drive device and an automatic control valve. The valve connection mechanism is used for connecting an actuator to a valve, and includes a shell connection structure and a valve stem transmission structure; the shell connection structure is used for fixing the flange of the actuator to the valve cover of the valve, and is adapted to valve covers of different outer diameters, and is fixedly connected to the valve cover through an adjustable lock block clamping mechanism; the valve stem transmission structure, the valve stem transmission structure is located inside the shell connection structure, and includes an automatic clamping assembly that is adapted to the outer hexagon of valve stem nuts of different sizes and a valve stem transmission input end connected to the output end of the actuator. The inventive connection mechanism of the present application realizes automatic adaptation and transmission connection with valve stem nuts of different specifications, and realizes connection with shells of different specifications, thereby improving the scope of application of the connection mechanism, and there is no need to configure a connection mechanism separately for each type of manual valve.

Description

Technical Field

[0001] The present invention relates to the technical field of valve control, and in particular to a valve connecting mechanism, a valve driving device and an automatic control valve. Background Art

[0002] Valves are divided into several types according to the driving mode, such as manual, electric, hydraulic and pneumatic. Manual valves are the most widely used. With the increasing difficulty of energy extraction, simplicity of on-site management, control drive accuracy, personnel safety and other requirements, the advantages of electric drive are becoming more and more obvious. A large number of manual valves in use at the well site and stored in the warehouse urgently need to improve the level of electric drive automation. Valves are standardized products, especially gate valves and throttle valves used in large quantities on site. The structures of valves of different specifications and types are similar. The valve cover and valve bonnet are the main pressure-bearing parts, and the connection between the two is in the form of flange. The valve bonnet is generally a circular flange shape. Most of the transmission of the valve is realized through the trapezoidal thread between the valve stem nut and the valve stem, and the valve stem nut is provided with a rotary drive external hexagon. However, due to the many series of nominal sizes and pressure levels of valves, the valve bonnet sizes of valves are different, the sizes of valve stem nuts are different, and the lengths of valve stems are not the same. It is costly and difficult to equip them with their own dedicated electric drive devices. Summary of the invention

[0003] The present invention is to solve the problems in the prior art and provides a valve connecting mechanism, a valve driving device and an automatic control valve.

[0004] The technical solution is as follows:

[0005] A valve connection mechanism, used 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 for fixedly connecting the flange of the actuator to the valve cover of the valve, and is adapted to valve covers of different outer diameters, and is fixedly connected to the valve cover through an adjustable locking block clamping mechanism;

[0007] The valve stem transmission structure is located inside the shell connection structure, and includes an automatic clamping component that is adapted to be connected to the outer hexagon of valve stem nuts of different sizes and a valve stem transmission input end connected to the output end of the actuator.

[0008] The working principle and beneficial effects of the present invention are as follows: the inventive connection mechanism of the present application realizes automatic adaptation transmission connection with valve stem nuts of different specifications and connection of housings of different specifications through the housing connection structure adapted to valve covers of different outer diameters and the automatic clamping assembly adapted to the outer hexagon of valve stem nuts of different sizes, thereby improving the application scope of the connection mechanism and eliminating the need to configure a connection mechanism separately for each type of manual valve. At the same time, the reliability of the housing connection is ensured by the adjustable lock block clamping mechanism fixedly connected to the valve cover, thereby avoiding damage to the valve cover.

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

[0010] Furthermore, the shell 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, and the valve cover connection end locks the shell connection structure on the valve cover through the adjustable locking block clamping mechanism.

[0011] The beneficial effect of adopting the above further solution is that the adjustable locking block clamping mechanism at the valve cover connecting end is used to adapt to and lock valve covers of different sizes.

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

[0013] Furthermore, the adjustable locking block clamping mechanism includes a threaded hole, a bolt, a limiting groove and a locking block, the limiting groove is arranged on the circumference of the inner surface of the valve cover connecting end, the threaded hole is connected to the limiting groove in the radial direction of the valve cover connecting end, the bolt is screwed into the threaded hole, and the locking block is connected to the bolt and slides in the limiting groove.

[0014] The beneficial effect of adopting the above further solution is that the locking block is restricted in the limiting groove and can only slide radially but cannot rotate, thereby ensuring that the locking block will not damage the surface of the valve cover during the clamping process.

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

[0016] Furthermore, there are multiple bolts, and scales are provided on the multiple bolts.

[0017] The beneficial effect of adopting the above further solution is that: scales are provided on the multiple bolts, and during installation, the scales on each bolt are located at the same position, ensuring that the axis of the shell connection structure is consistent with the axis of the valve stem.

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

[0019] Further, the automatic clamping assembly comprises an inner sleeve, a tapered sleeve and an outer sleeve;

[0020] The inner sleeve has a hexagonal connecting section and an outer sleeve connecting section. The inner diameter of the hexagonal connecting section is larger than the outer diameter of the hexagonal section, and a plurality of through holes corresponding to the hexagonal section are provided in the radial direction thereof. An elastically sliding locking pin is provided in each of the through holes, and the locking pin can abut against the plane of the hexagonal section.

[0021] The cone sleeve has a cone surface section and an inner sleeve connecting section, the inner sleeve connecting section is axially slidably sleeved on the hexagonal connecting end, the cone surface section has an inner cone surface, the small end of the inner cone surface is close to the inner sleeve connecting section, and the inner cone surface abuts against the locking pin;

[0022] The outer sleeve comprises a cone sleeve connecting section and the valve stem transmission input end, the cone sleeve connecting section is axially slidably sleeved on the outer sleeve connecting section, the cone sleeve connecting section and the inner sleeve connecting section have a spacing and are elastically connected through a first elastic component; the end face of the outer sleeve connecting section has a spacing with the outer sleeve and is elastically connected through a second elastic component.

[0023] The beneficial effect of adopting the above further scheme is: by setting the above mutually nested structure, combined with the effect of the elastic component, the automatic clamping assembly can achieve the clamping effect on the hexagonal nut; at the same time, due to the elastic connection, it can adapt to valve stems of different lengths. When the cone sleeve is pushed to move, the cone sleeve pushes the locking pin to move toward 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 inclined wedge clamping structure, which has a simple structure and a force-increasing effect. It can have a self-locking characteristic under the premise of limiting a certain cone angle, that is, after the thrust is removed, when the pin is subjected to the reverse force, it 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 achieve elastic sliding of the locking pin in the through hole, and the elastic coefficient of the first elastic component is greater than the elastic coefficient of the third elastic component.

[0025] The beneficial effect of adopting the above further scheme is: when the elastic coefficient of the first elastic component is greater than the elastic coefficient of the third elastic component, after a thrust is applied 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 also be improved as follows.

[0027] Furthermore, a valve stem sleeve matching the outer diameter of the valve stem is detachably provided in the inner sleeve, and a transition chamfer is provided on the valve stem sleeve near the inner diameter of the valve stem nut.

[0028] The beneficial effect of adopting the above further scheme is: during installation, after the valve stem sleeve abuts against the valve stem nut, it is ensured that the positions of the locking pin and the hexagon correspond to each other, thereby 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 movement.

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

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

[0031] The beneficial effect of adopting the above-mentioned further scheme is that the outer surface of the inner sleeve with a non-cylindrical structure ensures that the matching tapered sleeve and outer sleeve can slide in their axial direction and are well limited to rotation perpendicular to the axial direction, thereby improving reliability; at the same time, an axial guide mechanism is provided with a guide groove or a guide pin, and the matching tapered sleeve and outer sleeve are provided with a guide pin or a guide groove, which can also achieve reliable axial sliding while limiting radial rotation.

[0032] The present invention also provides a valve driving device, comprising an actuator and a valve connecting mechanism, wherein the valve connecting mechanism is the above-mentioned valve connecting mechanism, the actuator has an output end and a flange, the output end is transmission-connected to the valve stem transmission input end, and the flange is fixedly connected to the shell connection structure.

[0033] The beneficial effect of the valve driving device of the present invention is that by providing the above-mentioned valve connecting mechanism, driving of valves of different specifications through the actuator is achieved.

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

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

[0036] The beneficial effect of adopting the above further solution is: different actuators are selected according to different application conditions.

[0037] The present invention also provides an automatic control valve, comprising a valve and a valve driving device, wherein the valve driving device is the above-mentioned valve driving 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 the automatic control valve of the present invention is that the effect of automatic control valve is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a cross-sectional view of a first embodiment of the valve connection mechanism of the present invention;

[0041] Figure 2 is a cross-sectional view of the valve stem transmission structure in the first embodiment;

[0042] Figure 3 is a cross-sectional view of a first embodiment of a valve driving device of the present invention;

[0043] Figure 4 This is an overall appearance view of the first embodiment of the valve driving device;

[0044] Figure 5 It is a schematic diagram of the split structure of the first embodiment of the automatic control valve of the present invention;

[0045] Figure 6 is a cross-sectional view of a first embodiment of the automatic control valve of the present invention;

[0046] Figure 7 This is a first state diagram of the assembly process of the first embodiment of the automatic control valve of the present invention;

[0047] Figure 8 This is a second state diagram of the assembly process of the first embodiment of the automatic control valve of the present invention;

[0048] Fig. 9 This is a third state diagram of the assembly process of the first embodiment of the automatic control valve of the present invention;

[0049] Fig.10 is a schematic diagram of the three-dimensional structure of the first direction of the locking block embodiment;

[0050] Fig.11 is a schematic diagram of the three-dimensional structure of the locking block embodiment 1 in the second direction;

[0051] Fig.12 It is a schematic diagram of the three-dimensional structure of the second embodiment of the locking block in the first direction.

[0052] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0053] 1. Shell connection structure, 11. Valve cover connection end, 12. Actuator connection end, 13. Bolt, 14. Threaded hole, 15. Limiting groove, 16. Locking block, 17. Tooth pattern, 2. Valve stem transmission structure, 21. Valve stem transmission input end, 22. Automatic clamping assembly, 3. Inner sleeve, 31. Hexagonal connection section, 32. Outer sleeve connection section, 33. Through hole, 34. Locking pin, 35. Third elastic component, 36. Retaining ring, 4. Cone sleeve , 41. Conical surface section, 42. Inner sleeve connecting section, 43. Inner cone, 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 DESCRIPTION

[0054] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0055] See the structural diagram of the valve connection mechanism embodiment 1 of the present invention. Figure 1 to Figure 2 .

[0056] The valve connection mechanism is used for connecting the actuator 7 with the valve 8, and comprises a housing connection structure 1 and a valve stem transmission structure 2.

[0057] The housing connection structure 1 is used for fixedly connecting the flange 73 of the actuator 7 with the valve cover 81 of the valve 8 and is adapted to valve covers 81 with different outer diameters.

[0058] The valve stem transmission structure 2 is located inside the shell connection structure 1, and includes an automatic clamping assembly 22 adapted to be connected to the outer hexagonal adapter of valve stem nuts 82 of different sizes and a valve stem transmission input end 21 connected to the output end 72 of the actuator 7.

[0059] Specifically, the shell 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 an adjustable locking block clamping mechanism for locking the shell connection structure 1 on the valve cover 81.

[0060] The adjustable locking block clamping mechanism includes a threaded hole 14, a bolt 13, a limiting groove 15 and a locking block 16. The limiting groove 15 is arranged on the circumference of the inner surface of the valve cover connecting end 11. The threaded hole 14 is connected with the limiting groove 15 in the radial direction of the valve cover connecting end 11. The bolt 13 is screwed and connected with the threaded hole 14. The locking block 16 is connected with the bolt 13 and slides in the limiting groove 15, that is, a circle of grooves is provided at one end of the bolt 13, and the locking block 16 is provided with a movable clamping structure matching therewith to ensure that the bolt 13 can rotate freely, thereby driving the locking block 16 to slide in the limiting groove 15; scales are provided on multiple bolts 13.

[0061] For the connection between the shell connection structure 1 and the valve cover 81, the valve cover connection end 11 is put on the valve cover 81 of the valve 8, and multiple bolts 13 are rotated and adjusted to make the scale on each bolt 13 consistent. Because the size and specification of the bolts 13 are consistent, and the size and specification of the locking block 16 are also consistent, when the length of each bolt 13 is consistent, the spacing between the valve cover connection end 11 and the valve cover 81 at each position is also consistent, ensuring that the axis of the shell connection structure 1 is consistent with the axis of the valve stem 83. In this embodiment, the contact surface between the locking block 16 and the valve cover 81 is set to a concave and convex tooth pattern 17 to ensure the reliability of the clamping, and the overall shape of the contact surface between the locking block 16 and the valve cover 81 is consistent with the surface shape of the valve cover 81 to achieve overall surface contact. Specifically, in this embodiment, four bolts 13 are provided, and four locking blocks 16 corresponding to the four bolts 13 are provided. The directions of the tooth patterns 17 on two adjacent locking blocks 16 are perpendicular to each other. The mutually perpendicular tooth patterns can ensure the reliability of the installation of the shell connection structure 1; Figure 1 The direction of the teeth 17 on the upper and lower locking blocks 16 is perpendicular to the axis of the shell connection structure 1, and the axial movement of the shell connection structure 1 is limited after clamping. The direction of the teeth 17 on the middle locking block 16 is parallel to the axis of the shell connection structure 1, and the circumferential rotation of the shell connection structure 1 is limited after clamping.

[0062] The specific structure of the locking block 16 in this embodiment is shown in FIG. Figures 10 to 12 , Fig.10 In the embodiment, the locking block 16 is provided with a movable clamping structure for matching and connecting with the bolt 13; Fig.11 and Fig.12 The directions of the teeth 17 on the two locking blocks 16 are perpendicular to each other.

[0063] The inner hole 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, thereby improving the compatibility of the product. Among them, the actuator connection end 12 can also be set to different sizes according to actuators 7 of different specifications and types.

[0064] like Figure 2As shown, the automatic clamping assembly 22 includes an inner sleeve 3, a tapered sleeve 4 and an outer sleeve 5.

[0065] The inner sleeve 3 has a hexagonal connecting section 31 and an outer sleeve connecting section 32. The inner diameter of the hexagonal connecting section 31 is larger than the outer diameter of the hexagonal connecting section, and a plurality of through holes 33 corresponding to the hexagonal connecting section are provided in the radial direction thereof. An elastically sliding locking pin 34 is provided in each through hole 33, and the locking pin 34 can abut against the plane of the hexagonal connecting section. A retaining ring 36 is provided inside the inner sleeve 3 where the locking pin 34 is located. In this embodiment, the third elastic component 35 provides the elastic sliding function for the locking pin 34. 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.

[0066] The tapered sleeve 4 has a tapered surface section 41 and an inner sleeve connecting section 42. The inner sleeve connecting section 42 is axially slidably sleeved on the hexagonal connecting section 31. The tapered surface 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. A plurality of tapered sleeve locking screws 44 are provided on the inner sleeve connecting section 42 for locking the tapered sleeve 4 on the inner sleeve 3.

[0067] The outer sleeve 5 has a tapered sleeve connecting section 51 and a valve stem transmission input end 21, the tapered sleeve connecting section 51 is axially slidably sleeved on the outer sleeve connecting section 32, the tapered sleeve connecting section 51 and the inner sleeve connecting section 42 have a spacing and are elastically connected through a first elastic component 52, wherein a first pin 53 is fixedly arranged on the inner sleeve connecting section 42, the tapered sleeve connecting section 51 is provided with a countersunk hole for accommodating the first elastic component 52, the first elastic component 52 is sleeved on the first pin 53, and its two ends are respectively abutted against the inner sleeve connecting section 42 and the tapered sleeve connecting section 51; the end face of the outer sleeve connecting section 32 has a spacing with the outer sleeve 5 and is elastically connected through a second elastic component 54, wherein a second pin 55 is fixedly arranged on the valve stem transmission input end 21, the outer sleeve connecting section 32 is provided with a countersunk hole for accommodating the second elastic component 54, the second elastic component 54 is sleeved on the second pin 55, and its two ends are respectively abutted against the outer sleeve connecting section 32 and the outer sleeve 5. In this embodiment, the valve stem transmission input end 21 is configured as a hexagonal structure, which is adapted for transmission connection with the inner hexagonal structure of the output end 72 of the actuator 7 .

[0068] In this embodiment, the inner sleeve 3 is detachably provided with a valve stem sleeve 6 matching the outer diameter of the valve stem 83, and the valve stem sleeve 6 is provided with a transition chamfer near the inner diameter of the valve stem nut 82. That is, the valve stem sleeve 6 is screwed and locked with the through hole 33 in the inner sleeve 3 through the external thread. Figure 2The left end of the valve stem sleeve 6 is provided with a transition chamfer, so that when the valve stem sleeve 6 is sleeved on the valve stem 83 and moves, it is ensured that the valve stem sleeve 6 can move smoothly on the valve stem 83, and the valve stem sleeve 6 will not be stuck by the thread on the valve stem 83. The length of the valve stem sleeve 6 is selected according to the actual application of the mechanism, ensuring that when the valve stem sleeve 6 is installed, after the valve stem nut 82 is abutted, the locking pin 34 corresponds to the position of the hexagon, so that the locking pin 34 and the hexagon are positioned.

[0069] In this embodiment, the outer surface of the inner sleeve 3 is an outer hexagonal structure, and at the same time, the inner surface of the tapered sleeve 4 and the inner surface of the outer sleeve 5 are also provided with an inner hexagonal hole structure matching therewith, so as to ensure that the tapered sleeve 4 and the outer sleeve 5 matching therewith can slide in their axial direction and well limit the rotation perpendicular to the axial direction, and have high reliability. For the structure that realizes axial sliding and limits the rotation perpendicular to the axial direction, other methods can also be adopted, such as providing guide pins on the outer surface of the inner sleeve 3, and providing guide groove structures matching therewith on the inner surface of the tapered sleeve 4 and the inner surface of the outer sleeve 5; or providing guide grooves on the outer surface of the inner sleeve 3, and providing guide pin structures matching therewith on the inner surface of the tapered sleeve 4 and the inner surface of the outer sleeve 5.

[0070] The installation process of the valve stem transmission structure 2 is as follows: select a suitable valve stem sleeve 6, install it in the inner sleeve 3, sleeve the valve stem sleeve 6 on the valve stem 83, push the outer sleeve 5 to move the entire valve stem transmission structure 2 to the hexagonal position of the valve stem nut 82, and when 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 position of the valve stem nut 82. If it is not aligned, adjust the position of the valve stem sleeve 6 in the inner sleeve 3 according to the relative position until the position of the locking pin 34 is aligned with the outer hexagonal position of the valve stem nut 82, and the position of the locking pin 34 and the hexagonal position is positioned, and finally tighten the cone sleeve locking screw 44 to lock the cone sleeve 4 on the inner sleeve 3. In the installation process of this embodiment, in order to prevent the locking pin 34 from moving to the hexagonal position in advance, the cone sleeve locking screw 44 can be tightened before pushing the outer sleeve 5 to move, and the cone sleeve locking screw 44 can be loosened after the positioning is completed, so that the locking pin 34 abuts against the outer hexagonal position of the valve stem nut 82.

[0071] In this embodiment, the elastic coefficient of the first elastic component 52 is greater than the elastic coefficient of the third elastic component 35. After the thrust is applied 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.

[0072] The structural diagram of the valve driving device of the present invention is shown in FIG. Figure 3 to Figure 4, including an actuator 7 and a valve connecting mechanism, the valve connecting mechanism is the above-mentioned valve connecting mechanism, the actuator 7 has an output end 72 and a flange 73, the output end 72 is transmission-connected to the valve stem transmission input end 21, and the flange 73 is fixedly connected to the shell connection structure 1.

[0073] like Figure 3 As shown, the valve stem transmission input end 21 is set as a hexagonal structure, which is adapted to the inner hexagonal structure of the output end 72 of the actuator 7 for transmission connection; the actuator connection end 12 is fixedly connected with the flange 73 by screws (not shown in the figure), and the output end 72 of the actuator 7 rotates to drive the outer sleeve 5 to rotate. Since the outer sleeve 5 and the inner sleeve 3 will not move relative to each other in the radial direction, the inner sleeve 3 is further driven to rotate, and similarly, the inner sleeve 3 drives the cone sleeve 4 to rotate. In other words, the actuator 7 drives the entire valve stem transmission structure 2 to rotate, and then transmits the torque to the valve stem nut 82 of the valve 8, so that the actuator 7 drives the valve 8.

[0074] In this embodiment, the actuator 7 is an electric actuator 7, the main component of which is a motor 71. A manual drive mechanism handwheel 74 is also provided. When the electric drive fails, the actuator 7 can be driven normally by the handwheel 74.

[0075] In a specific embodiment, different types of actuators 7 are selected according to different application conditions. For example, in an application scenario requiring a larger torque, a hydraulic actuator 7 may be selected.

[0076] The structural diagram of the first embodiment of the automatic control valve of the present invention is shown in FIG. Figures 5 and 6 , including a valve 8 and a valve driving device, the valve driving device is the above-mentioned valve driving device, the valve 8 has a valve cover 81 and a valve stem nut 82; the shell 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 component 22.

[0077] like Figure 5 As shown, the valve 8 has a valve cover 81, a valve stem 83 is provided with a valve stem nut 82, and the valve cover connection end 11 is provided with four bolts 13 for locking the housing connection structure 1 on 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 with 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 with the inner sleeve 3.

[0078] The installation process of the automatic control valve of this embodiment 1 is described in Figures 7 to 9 ,like Figure 7As shown, select a suitable valve stem sleeve 6, install it in the inner sleeve 3, sleeve the valve stem sleeve 6 on the valve stem 83, push the outer sleeve 5 to move the entire valve stem transmission structure 2 to the hexagonal part of the valve stem nut 82, and when 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 in 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, and the locking pin 34 and the hexagonal position are positioned, and finally tighten the cone sleeve locking screw 44 to lock the cone sleeve 4 on the inner sleeve 3. It should be noted that, in addition to the hexagonal structure, the valve stem nut 82 in this embodiment also has other outer cylindrical structures at both ends of the hexagonal part. The abutment position of the valve stem sleeve 6 and the valve stem nut 82 in this embodiment is located at the end face of the outer cylinder of the valve stem nut 82.

[0079] like Figure 8 As shown, the housing connection structure 1 is fixedly connected to the valve cover 81, and the housing connection structure 1 is locked on the valve cover 81 of the valve 8 by four bolts 13. Fig. 9 As shown, the output end 72 of the actuator 7 is connected to the valve stem transmission input end 21 of the valve stem transmission structure 2 .

[0080] After matching and connecting, push the actuator 7, the actuator will move with the outer sleeve 5, compress the first elastic component 52, until the actuator connection end 12 abuts against the flange 73, install the connecting bolts between the actuator connection end 12 and the flange 73 and tighten them, then loosen the cone sleeve locking screw 44, the first elastic component 52 will push the cone sleeve 4 to move, the inner cone surface 43 squeezes the locking pin 34 and abuts against the hexagon, finally lock the cone sleeve locking screw 44, and the locking installation is completed. Figure 6 The structure shown.

[0081] In this embodiment, when the cone sleeve 4 is pushed to move, the cone sleeve 4 pushes the locking pin 34 to move toward the center through the cone surface section 41. The principle is to use the inclined surface to convert the thrust on the cone sleeve 4 into the thrust of the locking pin 34. The structure belongs to the inclined wedge clamping structure, which has a simple structure and a force-enhancing effect. It can have a self-locking characteristic under the premise of limiting a certain cone angle, that is, after the thrust is removed, when the pin is subjected to the reverse force, it will not push the cone sleeve 4 to move and cause the locking pin 34 to loosen the clamping of the hexagonal nut.

[0082] In this embodiment, since the outer sleeve 5 and the cone sleeve 4 are connected by elasticity, they have a longer adjustable range; at the same time, the outer sleeve 5 and the inner sleeve 3 are also connected by elasticity, and they also have a longer adjustable range. Figure 6 As shown, after the installation and assembly is completed, the valve stem 83 is still at a large distance from the valve stem transmission input end 21. At the same time, the two elastic components also have an adjustable distance, thereby achieving a good match for valve stems 83 of different lengths.

[0083] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve connection mechanism, used for connecting an actuator to a valve, characterized in that it comprises a housing connection structure and a valve stem transmission structure; The housing connection structure is used for fixing the flange of the actuator to the valve cover of the valve, is adapted to valve covers of different outer diameters, and is fixedly connected to the valve cover through an adjustable locking block clamping mechanism; The valve stem transmission structure is located inside the housing connection structure and includes an automatic clamping assembly adapted to be connected to the outer hexagon of valve stem nuts of different sizes and a valve stem transmission input end connected to the output end of the actuator; The automatic clamping assembly comprises an inner sleeve, a tapered sleeve and an outer sleeve; The inner sleeve has a hexagonal connecting section and an outer sleeve connecting section. The inner diameter of the hexagonal connecting section is larger than the outer diameter of the hexagonal section, and a plurality of through holes corresponding to the hexagonal section are provided in the radial direction thereof. An elastically sliding locking pin is provided in each of the through holes, and the locking pin can abut against the plane of the hexagonal section. The cone sleeve has a cone surface section and an inner sleeve connecting section, the inner sleeve connecting section is axially slidably sleeved on the hexagonal connecting end, the cone surface section has an inner cone surface, the small end of the inner cone surface is close to the inner sleeve connecting section, and the inner cone surface abuts against the locking pin; The outer sleeve comprises a cone sleeve connecting section and the valve stem transmission input end, the cone sleeve connecting section is axially slidably sleeved on the outer sleeve connecting section, the cone sleeve connecting section and the inner sleeve connecting section have a spacing and are elastically connected through a first elastic component; the end face of the outer sleeve connecting section has a spacing with the outer sleeve and is elastically connected through a second elastic component.

2. A valve connection mechanism according to claim 1, characterized in that: The shell 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, and the valve cover connection end locks the shell connection structure on the valve cover through the adjustable locking block clamping mechanism.

3. A valve connection mechanism according to claim 2, characterized in that: The adjustable locking block clamping mechanism includes a threaded hole, a bolt, a limiting groove and a locking block. The limiting groove is arranged on the circumference of the inner surface of the valve cover connecting end. The threaded hole penetrates the limiting groove in the radial direction of the valve cover connecting end. The bolt is screwed into the threaded hole, and the locking block is connected to the bolt and slides in the limiting groove.

4. A valve connection mechanism according to claim 3, characterized in that: There are multiple bolts, and scales are arranged on the multiple bolts.

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 in the through hole, and the elastic coefficient of the first elastic component is greater than the elastic coefficient of the third elastic component.

6. A valve connection mechanism according to claim 1, characterized in that: A valve stem sleeve matching the outer diameter of the valve stem is detachably arranged in the inner sleeve, and a transition chamfer is arranged at the inner diameter of the valve stem sleeve near the valve stem nut.

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

8. A valve driving device, comprising an actuator and a valve connecting 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 transmission-connected to the valve stem transmission input end, and the flange is fixedly connected to the shell connection structure.

9. A valve drive 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 driving device, characterized in that The valve driving device is the valve driving device according to claim 8 or 9, wherein 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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