Valve rod connecting unit and valve actuator

Abstract

The valve rod connecting unit comprises an inner sleeve (10), a clamping body (20) and an outer sleeve (30). The inner sleeve can be arranged on a connecting part (91) of the valve rod in a sleeving mode in the direction parallel to the axis (L) of the valve rod and stays at the assembling position. And a through hole (11) is formed in the sleeve wall of the inner sleeve. When the inner sleeve is located at the assembly position, the inner side opening of the through hole is opposite to the positioning groove (92) of the connecting part. The clamping body is movably arranged in the through hole so as to move between the embedding position where the clamping body is embedded into the positioning groove and the retreating position where the clamping body retreats from the positioning groove. The outer sleeve is movably arranged on the inner sleeve in a sleeving mode in the direction parallel to the axis of the valve rod and can move to the locking position from the releasing position. When the outer sleeve is located at the locking position, the outer sleeve can abut against the clamping body located at the embedding position inwards in the radial direction of the valve rod. The valve rod connecting unit is simple and convenient to operate and can be conveniently assembled with the valve rod. The invention further provides a valve actuator.

Description

Technical Field

[0001] This invention relates to the field of valves, and more particularly to valve stem connection units and valve actuators including the same. Background Technology

[0002] Valve actuators connect to the valve stem to achieve remote and precise control. Currently, in pressure-independent control valves, the connection between the valve actuator and the valve stem is mostly bolted, which is inconvenient for assembly. Summary of the Invention

[0003] The purpose of this invention is to provide a valve stem connection unit that facilitates assembly with a valve stem.

[0004] Another object of the present invention is to provide a valve actuator that is easy to assemble with a valve stem.

[0005] This invention provides a valve stem connection unit for a valve. The valve stem has a connecting portion. A positioning groove is recessed on the circumferential surface of the connecting portion. The valve stem connection unit includes an inner sleeve, a snap-fit ​​body, and an outer sleeve. The inner sleeve can be fitted onto the connecting portion in a direction parallel to the valve stem axis and can remain in an assembled position relative to the connecting portion. A through hole is provided in the wall of the inner sleeve. When the inner sleeve is in the assembled position, the inner opening of the through hole is opposite to the positioning groove in the radial direction of the valve stem. The snap-fit ​​body is movably disposed in the through hole to move between an engaged position and a disengaged position. The outer sleeve is movably fitted onto the inner sleeve in a locking direction parallel to the valve stem axis and in the opposite direction of the locking direction, and can move from a released position to a locked position in the locking direction. When the outer sleeve is in the locked position, it can abut against the snap-fit ​​body in the engaged position in the radial direction of the valve stem.

[0006] The valve stem connection unit is easy to operate and can be easily assembled with the valve stem.

[0007] In another illustrative embodiment of the valve stem connection unit, the outer sleeve and the inner sleeve are threadedly connected for at least a portion of the stroke, with the axis of the thread coinciding with the axis of the valve stem, and / or the outer sleeve and the inner sleeve are slidably connected for at least a portion of the stroke along the locking direction and the opposite direction of the locking direction. This facilitates operation.

[0008] In another illustrative embodiment of the valve stem connection unit, the snap-fit ​​body located in the withdrawn position partially extends outward from the outer opening of the through hole.

[0009] In another illustrative embodiment of the valve stem connection unit, the outer sleeve has a stop section, a push section, and a release section continuously arranged along the locking direction. When the outer sleeve is in the locked position, the inner circumferential surface of the stop section can abut against the locking body in the engaged position radially inward along the valve stem. The inner circumferential surface of the push section is a truncated cone lateral surface whose axis coincides with the axis of the valve stem, and the inner diameter of the truncated cone lateral surface gradually increases along the locking direction. When the outer sleeve is in the release position, the inner circumferential surface of the release section can abut against the locking body in the disengaged position radially inward along the valve stem. This allows the locking body to be pushed from the disengaged position to the engaged position while the outer sleeve is moved from the release position to the locked position, thereby simplifying the operation.

[0010] In another illustrative embodiment of the valve stem connection unit, the inner circumferential surface of the release section is provided with an internal thread. The outer circumferential surface of the inner sleeve is provided with an external thread that is threadedly connected to the internal thread. The release section abuts against the snap-fit ​​body located in the withdrawn position via the crest of the internal thread. This structure is compact and facilitates product miniaturization.

[0011] In another illustrative embodiment of the valve stem connecting unit, a first arc-shaped protrusion is provided on the outer circumferential surface of the inner sleeve. A second arc-shaped protrusion is provided on the inner circumferential surface of the outer sleeve. During the process of the outer sleeve being screwed from the release position to the locking position along the first helical direction, the second arc-shaped protrusion abuts against the first arc-shaped protrusion and passes over the first arc-shaped protrusion through the local elastic deformation of the inner sleeve and / or the outer sleeve. When the outer sleeve is in the locking position, the first arc-shaped protrusion abuts against the second arc-shaped protrusion to prevent the outer sleeve from being screwed out of the locking position in the opposite direction of the first helical direction. This helps to prevent loosening after the valve stem connecting unit and the valve stem are assembled.

[0012] In another illustrative embodiment of the valve stem connection unit, the snap-fit ​​body is a sphere. The through-hole is conical with its axis coinciding with the radial direction of the valve stem. The diameter of the through-hole gradually decreases from the outside to the inside, and the minimum diameter is smaller than the diameter of the snap-fit ​​body. This simplifies operation and prevents the snap-fit ​​body from disengaging from the inner opening of the through-hole.

[0013] In another illustrative embodiment of the valve stem connection unit, the inner sleeve is provided with several through holes. These through holes are evenly distributed along the circumference of the valve stem. The valve stem connection unit is provided with several snap-fit ​​bodies. Each snap-fit ​​body is located within one through hole. This facilitates improved stability.

[0014] In another illustrative embodiment of the valve stem connection unit, the circumferential wall of the inner sleeve is provided with a locking claw. During the process of the outer sleeve being fitted onto the inner sleeve in the locking direction, the outer sleeve can abut against the locking claw, causing the claw to elastically deform and retract inward. The retracted locking claw allows the outer sleeve to continue moving relative to the inner sleeve in the locking direction to the release position. When the outer sleeve moves to the release position, the locking claw resets under its own elastic restoring force and can lock the outer sleeve in the release position, preventing the outer sleeve in the release position from moving in the opposite direction of the locking direction. This prevents the outer sleeve from disengaging from the inner sleeve in the opposite direction of the locking direction during use and facilitates the assembly of the inner and outer sleeves.

[0015] In another illustrative embodiment of the valve stem connection unit, the outer peripheral surface of the inner sleeve has a contact surface facing the opposite direction to the locking direction. The contact surface can abut against the outer sleeve in the locked position in the opposite direction to the locking direction, thereby preventing the outer sleeve from continuing to move relative to the inner sleeve in the locking direction.

[0016] In another illustrative embodiment of the valve stem connection unit, the outer peripheral surface of the outer sleeve is recessed to accommodate fingertips and / or has anti-slip ridges. This facilitates manual operation.

[0017] The present invention also provides a valve actuator comprising the aforementioned valve stem connecting unit. The valve actuator is connected to the valve stem via the valve stem connecting unit. The valve stem connecting unit of this valve actuator is easy to operate and facilitates assembly with the valve stem. Attached Figure Description

[0018] The following figures are for illustrative purposes only and do not limit the scope of the invention.

[0019] Figure 1 This is a perspective view of one schematic embodiment of the valve stem connection unit.

[0020] Figure 2 Showing Figure 1 A partial sectional view of the valve stem connection unit shown.

[0021] Figure 3 for Figure 2 The diagram shows the changing states of the structure.

[0022] Figure 4 This is a sectional view of the outer sleeve.

[0023] Figure 5 for Figure 2 Another variation of the structure shown is illustrated.

[0024] Figure 6 A bottom view of the valve stem connection unit is shown.

[0025] Figure 7 for Figure 2 A partial enlarged view of the inner sleeve and the snap-fit ​​body shown.

[0026] Figures 8 to 10 This is used to illustrate the assembly process of the inner sleeve and the outer sleeve.

[0027] Figure 11 This is a schematic diagram illustrating one possible implementation of a valve stem.

[0028] Label Explanation

[0029] 10 Inner Sleeve

[0030] 11 Through Holes

[0031] 12 claws

[0032] 13. Supporting surface

[0033] 15 First arc-shaped protrusion

[0034] 20 card connectors

[0035] 30 Outerwear

[0036] 31. Resistance Section

[0037] 32. Pushing section

[0038] 33 Release Section

[0039] 35 Second arc-shaped protrusion

[0040] 36 grooves

[0041] 37 Anti-slip edges

[0042] 90 valve stem

[0043] 91 Connecting part

[0044] 92 Positioning slots

[0045] L - Valve stem axis

[0046] S Locking direction Detailed Implementation

[0047] To provide a clearer understanding of the technical features, objectives, and effects of the invention, specific embodiments of the invention are now described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate components with the same or similar structures but the same function.

[0048] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0049] In this document, terms such as "first" and "second" do not indicate their importance or order, but are only used to distinguish them to facilitate the description of the document.

[0050] To keep the drawings simple, each drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product.

[0051] This invention provides a valve stem connection unit, which, for example, is part of a valve actuator for connecting the valve stem of a valve. The valve actuator drives the valve stem movement via the valve stem connection unit. Alternatively, the valve stem connection unit can also be independent of the valve actuator, serving as a connecting device to connect the output end of the valve actuator and the valve stem. Figure 11 This illustration shows a schematic structure of a valve stem to which the valve stem connection unit of the present invention is applicable. For example... Figure 11 As shown, the valve stem 90 of the valve has, for example, a connecting portion 91. A positioning groove 92 is recessed in the circumferential surface of the connecting portion 91. The positioning groove 92 is, for example, annular around the circumference of the valve stem 90. In the following description, the structure of the valve stem connecting unit will be aided by the valve stem axis L, which can also be understood / equivalent to a reference axis of the valve stem connecting unit, which coincides with the valve stem axis after the valve stem connecting unit and the valve stem are assembled. The axial, radial, and circumferential directions of the valve stem are used similarly and can be understood / equivalent to the axial, radial, and circumferential directions corresponding to this reference axis.

[0052] Figure 1 This is a perspective view of one schematic embodiment of the valve stem connection unit. Figure 2 Showing Figure 1 A partial sectional view of the valve stem connection unit shown. Figure 3 for Figure 2 The diagram shows the changing states of the structure. Figure 2 and Figure 3 The valve stem 90 shown is a one-piece structure; however, in other illustrative embodiments, the valve stem 90 may also be assembled from multiple components. For example... Figures 1 to 3 As shown, the valve stem connection unit includes an inner sleeve 10 and four snap-fit ​​bodies 20. Figure 2 Only two snap-fit ​​bodies (20) and one outer sleeve (30) are visible in the middle.

[0053] like Figure 2 As shown, the inner sleeve 10 can be fitted downwards onto the connecting part 91 in a direction parallel to the valve stem axis L, and can remain in the assembly position relative to the connecting part 91. Figure 2 The inner sleeve 10 is positioned in the assembly position relative to the connecting part 91. For example... Figure 2 As shown, during the process of fitting the inner sleeve 10 into the connecting part 91, it may remain in the assembly position, for example, by being locked onto the flange at the bottom of the connecting part 91, but is not limited to this.

[0054] The inner sleeve 10 has four through holes 11 on its cylinder wall. Figure 2 Only two of the through holes 11 are visible in the middle. The four through holes 11 are evenly distributed along the circumference of the valve stem. Figure 2 As shown, when the inner sleeve 10 is in the assembled position, the inner opening of the through hole 11 is opposite to the positioning groove 92 along the radial position of the valve stem.

[0055] Each snap-fit ​​body 20 is movably disposed in a through hole 11, so as to be in the embedded position of the embedded positioning groove 92 (i.e. Figure 2 The position shown) and the exit position of the exit positioning slot 92 (i.e. Figure 3 Move between the positions shown. Figure 2 As shown, the snap-fit ​​body 20, located in the embedded position, can cooperate with the positioning groove 92 to fix the relative position of the inner sleeve 10 and the valve stem 90 along the axial direction of the valve stem. Figure 3 As shown, when the snap-fit ​​body 20 is in the withdrawn position, the inner sleeve 10 can be disengaged from the connecting part 91 of the valve stem 90 in a direction parallel to the axis L of the valve stem.

[0056] like Figure 1 and Figure 2 As shown, the outer sleeve 30 is movably fitted onto the inner sleeve 10 along the locking direction S parallel to the valve stem axis L and in the opposite direction of the locking direction S, and can move from the release position (i.e., along the locking direction S) to the release position. Figure 3 The position shown) moves to the locked position (i.e. Figure 2 (as shown in the image). Movement along the locking direction S can be interpreted here as spiraling forward along the locking direction S and / or moving along the locking direction S.

[0057] Specifically, in this illustrative embodiment, the travel of the outer sleeve 30 from the release position to the locked position is divided into a first half and a second half. During the first half of the travel from the release position to the locked position, the outer sleeve 30 and the inner sleeve 10 are slidably connected along the locking direction S and the opposite direction of the locking direction S. During the second half of the travel from the release position to the locked position, the outer sleeve 30 and the inner sleeve 10 are threadedly connected, and the axis of the thread coincides with the axis L of the valve stem, thereby facilitating operation. However, this is not the only possible embodiment. In other illustrative embodiments, the outer sleeve 30 and the inner sleeve 10 may be threadedly connected for at least a portion of the travel, and / or slidably connected for at least a portion of the travel.

[0058] like Figure 2 As shown, when the outer sleeve 30 is in the locked position, it can abut against the snap-fit ​​body 20 in the embedded position radially inward along the valve stem.

[0059] Before assembling the valve stem connecting unit with the valve stem, first adjust the valve stem connecting unit to... Figure 3As shown in the diagram, the valve stem connecting unit is then fitted onto the connecting part 91 of the valve stem 90, so that the inner sleeve 10 remains in the assembly position relative to the connecting part 91. Finally, the outer sleeve 30 is operated to reach the desired position. Figure 2 The locking position shown completes the assembly of the valve stem connection unit with the valve stem. This valve stem connection unit is easy to operate and facilitates assembly with the valve stem.

[0060] In this illustrative embodiment, the inner sleeve 10 is provided with four through holes 11. The four through holes 11 are evenly distributed along the circumference of the valve stem. The valve stem connecting unit is correspondingly provided with four snap-fit ​​bodies 20. Each snap-fit ​​body 20 is disposed in one through hole 11. However, this is not a limitation; in other illustrative embodiments, the number of through holes 11 and snap-fit ​​bodies 20 can be adjusted as needed.

[0061] Figure 4 This is a cross-sectional view of the outer sleeve. (For example...) Figure 4 As shown, in the illustrative embodiment, the outer sleeve 30 has a blocking section 31, a pushing section 32, and a releasing section 33 continuously arranged along the locking direction S. Figure 2 As shown, when the outer sleeve 30 is in the locked position, the inner circumferential surface of the abutment section 31 can abut against the snap-fit ​​body 20 located in the embedded position radially inward along the valve stem. Figure 4 As shown, the inner circumferential surface of the push section 32 is a truncated cone with its axis coinciding with the axis L of the valve stem, and the inner diameter of this truncated cone gradually increases along the locking direction S. Figure 3 As shown, the latching body 20 in the withdrawn position partially extends out of the outer opening of the through hole 11. When the outer sleeve 30 is in the released position, the inner circumferential surface of the release section 33 can abut against the latching body 20 in the withdrawn position radially inward along the valve stem to prevent the latching body 20 from disengaging from the outer opening of the through hole 11. In other illustrative embodiments, if the latching body 20 is restricted by the inner sleeve 10 and cannot disengage from the outer opening of the through hole 11 (e.g., the latching body 20 is slidably connected to the inner sleeve 10, and the stroke of the latching body 20 is limited by the length of the sliding groove), the release section 33 may not be provided.

[0062] Figure 5 for Figure 2 Another variation of the structure is shown in the diagram. During the movement of the outer sleeve 30 from the released position to the locked position along the locking direction S, the following sequential changes occur: Figure 3 , Figure 5 and Figure 2 The state shown. In Figure 3 In the middle, the outer sleeve 30 is in the release position, and it abuts against the locking body 20 in the retracted position along the radial direction of the valve stem via the inner circumferential surface of the release section 33, to prevent the locking body 20 from disengaging from the through hole 11. Figure 5In the middle, the outer sleeve 30 abuts against the locking body 20 through the inner circumferential surface of the pushing section 32. As the outer sleeve 30 moves along the locking direction S, the inner circumferential surface of the pushing section 32 can push the locking body 20, causing the locking body 20 to reach the embedded position. Figure 2 In the locked position, the outer sleeve 30 abuts against the locking body 20 in the engaged position radially inward along the valve stem via the inner circumferential surface of the abutment section 31, thereby holding the locking body 20 in the engaged position. This allows the locking body to be pushed from the disengaged position to the engaged position while the outer sleeve is moved from the released position to the locked position, thus simplifying operation.

[0063] like Figure 4 As shown, in the illustrative embodiment, the inner circumferential surface of the release section 33 is provided with an internal thread. For example... Figure 2 As shown, the outer circumferential surface of the inner sleeve 10 is provided with an external thread that connects to the internal thread. When the outer sleeve 30 is in the released position, the release section 33 abuts against the snap-fit ​​body 20 in the withdrawn position via the crest of the internal thread. This structure is compact and facilitates product miniaturization.

[0064] Figure 6 A bottom view of the valve stem connection unit is shown, with the outer sleeve 30 in the locked position relative to the inner sleeve 10. (See image below.) Figure 6 As shown in the enlarged portion of the schematic embodiment, the outer circumferential surface of the inner sleeve 10 is provided with a first arc-shaped protrusion 15. The inner circumferential surface of the outer sleeve 30 is provided with a second arc-shaped protrusion 35. During the process of the outer sleeve 30 being screwed from the release position to the locking position along a first helical direction (for example, a counterclockwise helical direction along the locking direction S), the second arc-shaped protrusion 35 abuts against the first arc-shaped protrusion 15 and passes over the first arc-shaped protrusion 15 through the local elastic deformation of the inner sleeve 10 and the outer sleeve 30. When the outer sleeve 30 is in the locked position, the first arc-shaped protrusion 15 can abut against the second arc-shaped protrusion 35 to prevent the outer sleeve 30 from being screwed out of the locked position in the opposite direction of the first helical direction. This helps to prevent loosening after the valve stem connecting unit and the valve stem are assembled.

[0065] In the illustrative embodiment, the snap-fit ​​body 20 is a sphere. Figure 7 for Figure 2 The enlarged view of the inner sleeve and the snap-fit ​​body shown indicates that... Figure 2 The snap-fit ​​body 20 on the left side and the through hole 11 therein. (Example) Figure 7 As shown, the through hole 11 is conical in shape, with its axis (dotted line in the figure) coinciding with the radial direction of the valve stem. The dashed line in the figure represents the extension line of the wall of the through hole 11. The diameter of the through hole 11 extends radially from the outside to the inside of the valve stem (i.e., from the radially outer side of the inner sleeve 10 to the radially inner side of the inner sleeve 10, that is... Figure 7The diameter gradually decreases from left to right. Thus, with the outer sleeve 30 in the released position, placing the valve stem connecting unit parallel to the direction of gravity in the locking direction S causes the snap-fit ​​body 20 to move radially outward along the valve stem under gravity until it abuts against the outer sleeve 30, simplifying operation. The minimum diameter of the through hole 11 (i.e., ...) Figure 7 The diameter of the hole at the right end of the through hole 11 is smaller than the diameter of the snap-fit ​​body 20, thereby preventing the snap-fit ​​body 20 from detaching from the through hole 11 through the inner opening.

[0066] like Figure 1 and Figure 2 As shown in the schematic embodiment, the inner sleeve 10 has two claws 12 on its circumferential wall. The two claws 12 are evenly distributed along the circumference of the valve stem. Figures 8 to 10 This illustrates the process of the outer sleeve 30 being fitted onto the inner sleeve 10 along the locking direction S. (Example) Figure 9 As shown, during the process of the outer sleeve 30 being fitted onto the inner sleeve 10 along the locking direction S, it can abut against the retaining claw 12, causing the retaining claw 12 to elastically deform and retract inward. The retracted retaining claw 12 allows the outer sleeve 30 to continue moving relative to the inner sleeve 10 along the locking direction S to the release position (i.e., Figure 10 (As shown in the image). Figure 10 As shown, when the outer sleeve 30 moves to the release position, the pawl 12 resets under its own elastic restoring force and locks the outer sleeve 30 in the release position, preventing the outer sleeve 30 in the release position from moving relative to the inner sleeve 10 in the opposite direction of the locking direction S. This prevents the outer sleeve 30 from disengaging from the inner sleeve 10 in the opposite direction of the locking direction S during use and facilitates the assembly of the inner sleeve 10 and the outer sleeve 30. In other illustrative embodiments, the number of pawls 12 can be adjusted as needed.

[0067] like Figure 2 and Figure 3 As shown in the schematic embodiment, the outer peripheral surface of the inner sleeve 10 has a contact surface 13 facing the opposite direction to the locking direction S. The contact surface 13 is, for example, an annular shape extending circumferentially along the valve stem. The contact surface 13 can abut against the outer sleeve 30 in the locked position in the opposite direction to the locking direction S to prevent the outer sleeve 30 from continuing to move relative to the inner sleeve 10 in the locking direction S.

[0068] like Figure 1 As shown in the schematic embodiment, the outer peripheral surface of the outer sleeve 30 is recessed with a groove 36 for accommodating fingertips and has anti-slip ridges 37. This facilitates manual operation.

[0069] The present invention also provides a valve actuator, in one illustrative embodiment of which includes the aforementioned valve stem connecting unit. The valve actuator's drive mechanism (e.g., a motor) is capable of driving the inner sleeve 10 relative to the valve actuator body via a transmission structure. The valve actuator is connected to the valve stem of the valve via the valve stem connecting unit and drives the valve stem movement via the valve stem connecting unit. The valve stem connecting unit of this valve actuator is easy to operate and facilitates assembly with the valve stem.

[0070] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0071] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent implementation schemes or modifications made without departing from the spirit of the present invention, such as combinations, divisions or repetitions of features, should be included within the scope of protection of the present invention.

Claims

1. A valve stem connecting unit for a valve, a valve stem (90) of the valve having a connecting portion (91), a circumferential surface of the connecting portion (91) being concavely provided with a positioning groove (92), characterized in that, The valve stem connecting unit comprises: an inner sleeve (10) which is fitted to the connecting portion (91) in a direction parallel to the axis (L) of the valve stem and can be stopped at an assembly position relative to the connecting portion (91), the sleeve wall of the inner sleeve (10) being provided with a through hole (11), the inner side opening of the through hole (11) being opposite the radial position of the positioning groove (92) of the valve stem when the inner sleeve (10) is at the assembly position; a clamping body (20) which is movably arranged in the through hole (11) to move between an embedded position embedded in the positioning groove (92) and an exit position out of the positioning groove (92); and an outer sleeve (30) which is movably fitted to the inner sleeve (10) in a locking direction (S) parallel to the axis (L) of the valve stem and the reverse direction of the locking direction (S) and can move from a release position to a locking position along the locking direction (S), the outer sleeve (30) being able to abut against the clamping body (20) at the embedded position in the radial direction of the valve stem when it is at the locking position.

2. The valve stem coupling unit of claim 1, wherein The outer sleeve (30) and the inner sleeve (10) are threadedly connected over at least part of the stroke, and the axis of the thread coincides with the axis (L) of the valve stem, and / or the outer sleeve (30) and the inner sleeve (10) are slidingly connected in the locking direction (S) and the reverse direction of the locking direction (S) over at least part of the stroke.

3. The valve stem coupling unit of claim 2, wherein The clamping body (20) at the exit position partially protrudes out of the outer side opening of the through hole (11).

4. The valve stem coupling unit of claim 3, wherein The outer sleeve (30) has a blocking section (31), a pushing section (32) and a release section (33) arranged in succession along the locking direction (S), the inner peripheral surface of the blocking section (31) being able to abut against the clamping body (20) at the embedded position in the radial direction of the valve stem when the outer sleeve (30) is at the locking position, the inner peripheral surface of the pushing section (32) being a conical frustum side surface with an axis coinciding with the axis (L) of the valve stem, and the inner diameter of the conical frustum side surface gradually increases along the locking direction (S), the inner peripheral surface of the release section (33) being able to abut against the clamping body (20) at the exit position in the radial direction of the valve stem when the outer sleeve (30) is at the release position.

5. The valve stem coupling unit of claim 4, wherein The inner peripheral surface of the release section (33) is provided with an internal thread, the outer peripheral surface of the inner sleeve (10) is provided with an external thread threadedly connected with the internal thread, and the release section (33) abuts against the clamping body (20) at the exit position by the tooth crest of the internal thread.

6. The valve stem coupling unit of claim 2, wherein The outer periphery of the inner sleeve (10) is provided with a first arc-shaped protrusion (15), and the inner periphery of the outer sleeve (30) is provided with a second arc-shaped protrusion (35). During the process that the outer sleeve (30) is screwed into the locking position from the release position along the first screwing direction, the second arc-shaped protrusion (35) abuts against the first arc-shaped protrusion (15) and overcomes the first arc-shaped protrusion (15) through the partial elastic deformation of the inner sleeve (10) and / or the outer sleeve (30). When the outer sleeve (30) is in the locking position, the first arc-shaped protrusion (15) can abut against the second arc-shaped protrusion (35) to prevent the outer sleeve (30) from being unscrewed in the reverse direction of the first screwing direction out of the locking position.

7. The valve stem coupling unit of claim 1, wherein The clamping body (20) is a sphere, the through hole (11) is conical, the axis of the through hole (11) is radially coincident with the valve stem, the diameter of the through hole (11) gradually decreases from outside to inside, and the minimum diameter is smaller than the diameter of the clamping body (20).

8. The valve stem coupling unit of claim 1, wherein The inner sleeve (10) is provided with a plurality of through holes (11), and the plurality of through holes (11) are uniformly distributed along the circumference of the valve stem. The valve stem connecting unit is provided with a plurality of clamping bodies (20), and each clamping body (20) is arranged in one through hole (11).

9. The valve stem coupling unit of claim 1, wherein The circumferential wall of the inner sleeve (10) is provided with a clamping jaw (12). During the process that the outer sleeve (30) is sleeved on the inner sleeve (10) along the locking direction (S), the outer sleeve (30) can abut against the clamping jaw (12) to elastically deform and retract the clamping jaw (12) inward. The retracted clamping jaw (12) allows the outer sleeve (30) to continue to move relative to the inner sleeve (10) along the locking direction (S) to the release position. When the outer sleeve (30) moves to the release position, the clamping jaw (12) resets under the action of its elastic restoring force and can clamp the outer sleeve (30) located in the release position, so as to prevent the outer sleeve (30) located in the release position from moving in the reverse direction of the locking direction (S).

10. The valve stem coupling unit of claim 1, wherein The outer periphery of the inner sleeve (10) has an abutting surface (13) facing the opposite direction of the locking direction (S), and the abutting surface (13) can abut against the outer sleeve (30) located in the locking position in the reverse direction of the locking direction (S).

11. The valve stem coupling unit of claim 1, wherein The outer periphery of the outer sleeve (30) is concavely provided with a groove (36) for accommodating the finger pulp and / or is formed with anti-skid edges (37).

12. A valve actuator, characterized by The valve stem connecting unit as claimed in any one of claims 1 to 11 is connected to a valve stem (90) by a valve actuator.

Images