Valve actuator

Abstract

A valve actuator comprises a supporting body (10), an operating piece (20), an output shaft (30), a first transmission unit (40) and an indicating piece (50). The operating member and the output shaft are both rotatably connected to the support body about a first axis (L1). The first transmission unit is drivably connected to the operating member and the output shaft. The indicating piece is arranged on the operating piece in a penetrating mode in the first direction (D1) and can rotate around the first axis relative to the operating piece. The end, penetrating out of the operating piece in the first direction, of the indicating piece is connected with the output shaft so as to coaxially rotate at the same angle with the output shaft. The end, penetrating out of the operating piece in the direction opposite to the first direction, of the indicating piece is provided with an indicating part (51). The indicating part is used for being observed to determine the rotation position of the indicating piece relative to the supporting body. The valve actuator is more compact in structure and beneficial to saving space.

Description

Technical Field

[0001] The invention relates to an actuator, in particular to a valve actuator. Background Art

[0002] A valve actuator is a machine used to drive a valve. A valve actuator generally has a power device, a manual mechanism, and a position indicating mechanism. The power device is connected to the output shaft for automatic driving. The power device is, for example, a pneumatic device, a hydraulic device, or an electric device. The manual mechanism is used to manually drive the output shaft. The position indicating mechanism is used to display the actual rotation position of the output shaft. The manual mechanism and position indicating mechanism of the existing valve actuator occupy a large space, which is not conducive to the miniaturization of the valve actuator. Summary of the invention

[0003] The object of the present invention is to provide a valve actuator with a more compact structure, which is conducive to saving space.

[0004] The present invention provides a valve actuator, which includes a supporting body, an operating member, an output shaft, a first transmission unit and an indicator. The operating member is rotatably connected to the supporting body around a first axis. The output shaft is rotatably connected to the supporting body around the first axis. The first transmission unit is rotatably connected to the operating member and the output shaft. The indicator is inserted into the operating member along a first direction parallel to the first axis and is configured to be able to rotate relative to the operating member around the first axis. One end of the indicator that passes through the operating member along the first direction is connected to the output shaft so as to be able to rotate coaxially and at the same angle as the output shaft. One end of the indicator that passes through the operating member in the opposite direction of the first direction has an indicator. The indicator is used to be observed to determine the rotational position of the indicator relative to the supporting body.

[0005] The valve actuator makes the structure more compact and helps save space by setting the relative positions and connection relationship of the operating member, the indicating member and the output shaft.

[0006] In another schematic embodiment of the valve actuator, the operating member includes an operating shaft axially parallel to the first direction. The operating shaft has a clamping portion. The clamping portion is in the shape of a rotating body with the first axis as the axis. The support body includes a plurality of clamping members. The plurality of clamping members are distributed around the operating shaft in a circumferential direction perpendicular to the first axis. Each clamping member forms a snap connection with the clamping portion to limit the movement of the operating member relative to the support body in the first direction and the opposite direction of the first direction. The plurality of clamping members can limit the rotation of the operating member relative to the support body around the first axis. This facilitates assembly.

[0007] In another exemplary embodiment of the valve actuator, the clamping portion has an annular clamping groove. The support body has a main body. One end of each clamping member along the first direction is fixedly connected to the main body, and the other end is freely arranged and has a clamping block. The clamping block is inserted into the clamping groove to form a buckle connection. The structure has good stability.

[0008] In another exemplary embodiment of the valve actuator, the operating member includes an operating shaft axially parallel to the first direction and a knob. The operating shaft is rotatably connected to the support body around the first axis. The knob is located on one side of the operating shaft along the first direction and is fixedly connected to the operating shaft. The indicator member has a rotating shaft portion axially parallel to the first direction. The rotating shaft portion is rotatably connected around the first axis and penetrates the knob and the operating shaft. The indicator portion is fixedly connected to one end of the rotating shaft portion that passes through the knob. This helps to improve stability during movement.

[0009] In another exemplary embodiment of the valve actuator, the operating shaft has a limiting portion arranged around the rotating shaft portion. The limiting portion can abut against the rotating shaft portion in the opposite direction of the first direction. The valve actuator also includes a cover body. The cover body is connected to the knob and forms a receiving cavity for receiving the indicating portion with the knob. The cover body is provided with a pointed portion protruding along the first direction. The tip of the pointed portion can abut against a portion of the indicating portion coinciding with the first axis in the first direction. The structure is simple and can limit the position of the indicating member relative to the operating member in the first direction.

[0010] In another exemplary embodiment of the valve actuator, the transparency of the cover is set so that the indicator can be observed through the cover, thereby facilitating observation.

[0011] In another exemplary embodiment of the valve actuator, the first transmission unit includes a first transmission gear, a duplex gear and a second transmission gear. The first transmission gear is configured to be able to rotate relative to the support body around a first axis. The operating member is key-connected to the first transmission gear. The duplex gear is configured to be able to rotate relative to the support body around a second axis parallel to the first axis. The duplex gear has a first gear ring and a second gear ring. The first gear ring meshes with the first transmission gear. The second transmission gear is configured to be able to rotate relative to the support body around the first axis and mesh with the second gear ring. The second transmission gear is key-connected to the output shaft. The structure is simple and has good stability.

[0012] In another exemplary embodiment of the valve actuator, the first transmission gear has an assembly hole extending in a first direction. The operating member is inserted into one end of the assembly hole in the first direction to be key-connected with the first transmission gear. The output shaft is rotatably inserted into the other end of the assembly hole in the first direction around the first axis. One end of the indicator member passing through the operating member in the first direction extends into the assembly hole and is inserted into the output shaft to be key-connected with the output shaft. This structure is conducive to improving stability during operation.

[0013] In another exemplary embodiment of the valve actuator, the transmission ratio of the first transmission gear and the first ring gear is greater than 1, and the transmission ratio of the second ring gear and the second transmission gear is greater than 1. By setting the transmission ratio, the operating torque can be effectively reduced, so that the operator can operate easily.

[0014] In another exemplary embodiment of the valve actuator, the indicator is configured to point to a pointer perpendicular to the first axis. The support body is provided with a dial to cooperate with the pointer to determine the rotational position of the indicator relative to the support body. This facilitates determining the actual rotational position of the output shaft.

[0015] In another exemplary embodiment of the valve actuator, the valve actuator further includes a motor and a second transmission unit. The second transmission unit is transmission-connected to the motor and the first transmission unit, so that the motor can drive the output shaft to rotate through the second transmission unit and the first transmission unit, thereby achieving automatic drive.

[0016] In another exemplary embodiment of the valve actuator, the second transmission unit is a fixed-axis gear train. The fixed-axis gear train includes a fifth transmission gear. The fifth transmission gear is rotatably connected to the support body around an axis parallel to the first direction. The fifth transmission gear can move relative to the support body in the first direction and the opposite direction of the first direction to disconnect and connect the transmission route of the fixed-axis gear train. The valve actuator also includes a first elastic member, a separation member and a second elastic member. The first elastic member can apply elastic force to the fifth transmission gear so that the fifth transmission gear is maintained at a position connecting the transmission route of the fixed-axis gear train. The separation member is movably connected to the support body in the first direction and the opposite direction of the first direction. The separation member can move in the first direction to abut against the fifth transmission gear to move the fifth transmission gear to a position disconnecting the transmission route of the fixed-axis gear train. The second elastic member can apply elastic force to the separation member so that the separation member moves in the opposite direction of the first direction. By controlling the separation member, the resistance when the operating member is rotated can be reduced, which can facilitate manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following drawings are only used to schematically illustrate and explain the present invention, and do not limit the scope of the present invention.

[0018] Figure 1 A schematic structural diagram of a schematic implementation of a valve actuator.

[0019] Figure 2 for Figure 1 A cross-sectional view of a portion of the structure of a valve actuator is shown.

[0020] Figure 3 Shows Figure 2 Partial structure of the structure shown.

[0021] Figure 4 for Figure 3 Exploded schematic diagram of the structure shown.

[0022] Figure 5 For illustration Figure 1 The clamping parts of the valve actuator are shown.

[0023] Figure 6 For illustration Figure 1 The second transmission unit of the valve actuator is shown.

[0024] Figure 7 for Figure 1 A perspective sectional view of a portion of the structure of a valve actuator is shown.

[0025] Description of symbols

[0026] 10 Support the main body

[0027] 11 Main body

[0028] 13 Card connector

[0029] 131 card blocks

[0030] 14 dial

[0031] 20 operating parts

[0032] 21 Operating axis

[0033] 211 card connection

[0034] 212 card slots

[0035] 213 limiter

[0036] 22 Knobs

[0037] 24 Accommodation chamber

[0038] 30 Output shaft

[0039] 40 First transmission unit

[0040] 41 First transmission gear

[0041] 411 mounting hole

[0042] 42 double gear

[0043] 421 first gear ring

[0044] 422 Second gear ring

[0045] 43 Second transmission gear

[0046] 50 indicator pieces

[0047] 51 Instruction Department

[0048] 52 shaft

[0049] 60 motor

[0050] 70 Second transmission unit

[0051] 71 Third transmission gear

[0052] 72 Fourth transmission gear

[0053] 73 Fifth transmission gear

[0054] 74 Sixth transmission gear

[0055] 81 first elastic member

[0056] 82 Separation Parts

[0057] 83 second elastic member

[0058] 84 cover

[0059] 841 apex

[0060] 90 valve stem

[0061] L1 first axis

[0062] L2 Second axis

[0063] D1 first direction DETAILED DESCRIPTION

[0064] In order to have a clearer understanding of the technical features, purposes and effects of the invention, the specific embodiments of the present invention are now described with reference to the accompanying drawings. The same reference numerals in the drawings represent components with the same structure or similar structures but the same functions.

[0065] In this document, “exemplary” means “serving as an example, instance or illustration”, and any diagram or implementation described in this document as “exemplary” should not be interpreted as a more preferred or more advantageous technical solution.

[0066] In this article, "first", "second", etc. do not indicate their importance or order, but are only used to indicate the difference between each other for the convenience of document description.

[0067] In order to simplify the drawings, each figure only schematically shows the parts related to the present invention, which do not represent the actual structure of the product.

[0068] Figure 1 A schematic structural diagram of a schematic implementation of a valve actuator. Figure 2 for Figure 1 The cross-sectional view of the partial structure of the valve actuator is shown in FIG. Figure 1 and Figure 2 As shown, the valve actuator includes a supporting body 10, an operating member 20, an output shaft 30, a first transmission unit 40 and an indicator 50. For clarity, Figure 2 Part of the structure supporting the main body 10 is omitted.

[0069] like Figure 2 As shown, the operating member 20 is rotatably connected to the support body 10 around a first axis L1. The operating member 20 is used for manual operation by a user. The output shaft 30 is rotatably connected to the support body 10 around the first axis L1. The output shaft 30 is used to connect to the valve stem 90 of the valve to drive the valve stem 90 to rotate. Figure 2 As shown, in this exemplary embodiment, the operating member 20 is located on the upper side of the output shaft 30. The first transmission unit 40 is transmission-connected to the operating member 20 and the output shaft 30, whereby the output shaft 30 can be driven to rotate by rotating the operating member 20.

[0070] Figure 3 Shows Figure 2 Part of the structure shown, Figure 4 Shows Figure 3 The decomposition structure of the structure shown. Figure 3 and Figure 4 As shown, the indicator 50 is disposed in the operating member 20 along a first direction D1 parallel to the first axis L1 and is configured to be rotatable around the first axis L1 relative to the operating member 20. One end of the indicator 50 (i.e., Figure 3 and Figure 4 The indicator 50 is connected to the output shaft 30 so as to be able to rotate coaxially and at the same angle as the output shaft 30. In the exemplary embodiment, the indicator 50 and the output shaft 30 are plugged into each other to form a key fit, thereby achieving coaxial and angular rotation, but it is not limited thereto. In other exemplary embodiments, the indicator 50 can also be connected to the output shaft 30 by, for example, welding, snap connection, etc. One end of the indicator 50 (i.e., the end of the indicator 50 that passes through the operating member 20 in the opposite direction of the first direction D1) is Figure 3 and Figure 4 The upper end of the indicator 50 has an indicator portion 51. The indicator portion 51 is used to be observed to determine the rotation position of the indicator 50 relative to the support body 10. Figure 1 As shown, the indicator 51 is, for example, provided as a pointer pointing perpendicularly to the first axis L1.

[0071] In the valve actuator of the exemplary embodiment, the operating member 20 can drive the output shaft 30 to rotate through the first transmission unit 40, and the rotating output shaft 30 drives the indicator 50 to rotate coaxially and at the same angle, thereby displaying the actual rotation position of the output shaft 30 through the indicator 50. The valve actuator makes the structure more compact and helps save space by setting the relative positions and connection relationships of the operating member, the indicator and the output shaft.

[0072] like Figure 2 As shown, in the exemplary embodiment, the operating member 20 includes an operating shaft 21 whose axial direction is parallel to the first direction D1. The operating shaft 21 is rotatably connected to the support body 10 around the first axis L1. Specifically, the operating shaft 21 has a clamping portion 211. The clamping portion 211 is in the shape of a rotating body with the first axis L1 as the axis. Figure 2 and Figure 5 As shown, the support body 10 includes a plurality of clips 13, the number of which can be set as needed, for example, six or eight, but not limited thereto. The plurality of clips 13 are evenly distributed around the operating shaft 21 in a circumferential direction perpendicular to the first axis L1. Figure 2 As shown, each clamping member 13 forms a snap connection with the clamping portion 211 to limit the movement of the operating member 20 relative to the support body 10 along the first direction D1 and the opposite direction of the first direction D1. Several clamping members 13 can also limit the rotation of the operating member 20 relative to the support body 10 around the first axis L1. During assembly, the operating shaft 21 of the operating member 20 is inserted into the space surrounded by several clamping members 13 along the first direction D1, and the snap connection between the clamping portion 211 and several clamping members 13 is completed, that is, the installation of the operating member 20 is realized. This is conducive to improving the installation efficiency.

[0073] Specifically, in an exemplary embodiment, Figure 2 and Figure 3 As shown, the clamping portion 211 has an annular clamping groove 212. Figure 2 As shown, the support body 10 has a main body portion 11. Each clamping member 13 is disposed along one end of the first direction D1 (i.e. Figure 2 The upper end of the body 11 is fixedly connected to the main body 11, and the other end (i.e. Figure 2 The lower end of the clamping member 13 is freely arranged and has a clamping block 131. The clamping block 131 is inserted into the clamping slot 212 to form a snap connection. The structure has good stability. The snap connection is a connection method that forms a specific constraint on the part through the joint action of a positioning function part and a locking function part that are integrated on the part or separated, wherein the locking function part is deformed during the assembly process and then returns to its original position to form a lock and provide a holding force. In this exemplary embodiment, the clamping member 13 is equivalent to the locking function part, and the clamping portion 211 is equivalent to the positioning function part.

[0074] like Figure 2 and Figure 3 As shown, in the exemplary embodiment, the operating member 20 further includes a knob 22. The knob 22 is located on one side of the operating shaft 21 along the first direction D1 (i.e. Figure 2 and Figure 3 The indicator 50 is provided with a rotating shaft portion 52 axially parallel to the first direction D1. The rotating shaft portion 52 is rotatably connected around the first axis L1 and is provided through the rotating knob 22 and the operating shaft 21. The indicator portion 51 is fixedly connected to one end of the rotating shaft portion 52 extending from the rotating knob 22. This helps to improve the stability during the movement.

[0075] like Figure 2 and Figure 3 As shown, in the exemplary embodiment, the operating shaft 21 has a limit portion 213 arranged around the rotating shaft portion 52. The limit portion 213 is, for example, in a step shape, but is not limited thereto. The limit portion 213 can abut against the rotating shaft portion 52 in the opposite direction of the first direction D1. The valve actuator also includes a cover body 84. The cover body 84 is connected to the knob 22 and forms a receiving cavity 24 with the knob 22 to accommodate the indicating portion 51. The cover body 84 is provided with a pointed portion 841 protruding along the first direction D1. The tip of the pointed portion 841 (i.e. Figure 2 and Figure 3 The lower end of the cover 84 can abut against the portion of the indicator 51 that coincides with the first axis L1 along the first direction D1. This structure is simple and can limit the position of the indicator 50 relative to the operating member 20 along the first direction D1. In addition, the provision of the cover 84 is also conducive to preventing contaminants (liquid or dust) from entering. The transparency of the cover 84 is, for example, set so that the indicator 51 can be observed through the cover 84.

[0076] like Figure 3 and Figure 4As shown, in the exemplary embodiment, the first transmission unit 40 includes a first transmission gear 41, a double gear 42 and a second transmission gear 43. The first transmission gear 41 is configured to be able to rotate relative to the support body 10 around the first axis L1. The operating member 20 is keyed to the first transmission gear 41. The double gear 42 is configured to be able to rotate relative to the support body 10 around a second axis L2 parallel to the first axis L1. The double gear 42 has a first gear ring 421 and a second gear ring 422. The first gear ring 421 meshes with the first transmission gear 41. The second transmission gear 43 is configured to be able to rotate relative to the support body 10 around the first axis L1 and meshes with the second gear ring 422. The second transmission gear 43 is keyed to the output shaft 30. The second transmission gear 43 is, for example, sleeved on the output shaft 30 to save space, but is not limited thereto. Thereby, the rotating operating member 20 drives the output shaft 30 to rotate through the first transmission gear 41, the double gear 42, and the second transmission gear 43 in sequence. In the exemplary embodiment, the transmission ratio of the first transmission gear 41 and the first gear ring 421 is greater than 1, and the transmission ratio of the second gear ring 422 and the second transmission gear 43 is greater than 1. By setting the transmission ratio, the operating torque can be effectively reduced, so that the operator can operate easily. The second transmission gear 43 is, for example, a sector gear, which is conducive to saving space, but is not limited thereto.

[0077] Further, in an exemplary embodiment, as Figure 3 and Figure 4 As shown, the first transmission gear 41 has an assembly hole 411 extending in the first direction D1. The operating member 20 is inserted into one end of the assembly hole 411 in the first direction D1 (i.e. Figure 3 and Figure 4 The output shaft 30 is rotatably inserted into the other end of the assembly hole 411 along the first direction D1 (i.e., the upper end in the middle) to be key-connected with the first transmission gear 41. Figure 3 and Figure 4 The end of the indicator 50 that passes through the operating member 20 along the first direction D1 (i.e. Figure 3 and Figure 4 The lower end of the output shaft 30 is inserted into the assembly hole 411 and inserted into the output shaft 30 to be key-connected with the output shaft 30. This structure is conducive to improving the stability during operation. One end of the output shaft 30 inserted into the assembly hole 411 is, for example, connected by a bearing ( Figure 3 and Figure 4 The midpoint-filled structure) is rotatably connected to the first transmission gear 41, but is not limited thereto.

[0078] like Figure 1As shown, in the exemplary embodiment, the indicator 51 is configured to point to a pointer perpendicular to the first axis L1. The support body 10 is provided with a dial 14 to cooperate with the pointer to determine the rotation position of the indicator 50 relative to the support body 10. This facilitates determining the actual rotation position of the output shaft.

[0079] like Figure 2 As shown, in the exemplary embodiment, the valve actuator further includes a motor 60 and a second transmission unit 70. The second transmission unit 70 is transmission-connected to the motor 60 and the first transmission unit 40, so that the motor 60 can drive the output shaft 30 to rotate through the second transmission unit 70 and the first transmission unit 40. Thereby, automatic driving is achieved. In other exemplary embodiments, the motor can also be replaced by a pneumatic device or a hydraulic device.

[0080] Specifically, Figure 6 As shown, the second transmission unit 70 is a fixed-axis gear train, which includes a third transmission gear 71, a fourth transmission gear 72, a fifth transmission gear 73 and a sixth transmission gear 74 that are meshed in sequence. The third transmission gear 71 is fixedly connected to the output shaft of the motor 60. The sixth transmission gear 74 is meshed with the double gear 42. The fourth transmission gear 72, the fifth transmission gear 73 and the sixth transmission gear 74 are, for example, double gears to facilitate torque adjustment.

[0081] See also Figure 6 In the exemplary embodiment, the fifth transmission gear 73 can also move relative to the support body 10 along the first direction D1 and the opposite direction of the first direction D1 to be in a position meshed with the sixth transmission gear 74 (i.e. Figure 6 The position shown in FIG. 1 and the position disengaged from the sixth transmission gear 74 (i.e., Figure 6 The sixth transmission gear 74 is disengaged from the sixth transmission gear 74. Figure 7 As shown, the valve actuator further includes a first elastic member 81, a separator 82 and a second elastic member 83. The first elastic member 81 can apply elastic force to the fifth transmission gear 73 so that the fifth transmission gear 73 is maintained at a position connected to the transmission route of the fixed axis gear system (i.e., a position meshed with the sixth transmission gear 74). The separator 82 is movably connected to the support body 10 along the first direction D1 and the opposite direction of the first direction D1. The separator 82 can move along the first direction D1 to abut against the fifth transmission gear 73 to move the fifth transmission gear 73 to a position disconnecting the transmission route of the fixed axis gear system (i.e., a position disengaged from the sixth transmission gear 74). The second elastic member 83 can apply elastic force to the separator 82 so that the separator 82 moves in the opposite direction of the first direction D1. The first elastic member 81 and the second elastic member 83 are, for example, compression springs, but are not limited thereto.

[0082] When in use, the separating member 82 is manually pressed along the first direction D1 to push the fifth transmission gear 73 to move to a position disengaged from the sixth transmission gear 74. At this time, the rotating operating member 20 to adjust the angle of the output shaft 30 will not be subject to resistance from the motor 60, which is convenient for manual operation. When the separating member 82 is released, the separating member 82 moves in the opposite direction of the first direction D1 under the action of the second elastic member 83. Since the separating member 82 is no longer abutted, the fifth transmission gear 73 moves in the opposite direction of the first direction D1 under the action of the first elastic member 81 to a position meshing with the sixth transmission gear 74.

[0083] In the exemplary embodiment, the support body 10 is provided with a cavity, in which the first transmission unit 40, the motor 60, and the second transmission unit 70 are arranged. The support body 10 is composed of a plurality of components for easy assembly. A sealing ring is provided between the operating member 20 and the support body 10 and between the output shaft 30 and the support body 10 to prevent contaminants such as liquid from entering the cavity, so as to protect the structure in the cavity.

[0084] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0085] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation scheme or changes that do not deviate from the technical spirit of the present invention, such as combination, division or repetition of features, should be included in the scope of protection of the present invention.

Claims

1. A valve actuator, characterized in that: include: a supporting body (10); an operating member (20) rotatably connected to the supporting body (10) around a first axis (L1); an output shaft (30) rotatably connected to the support body (10) about the first axis (L1); a first transmission unit (40) which can transmission-connect the operating member (20) and the output shaft (30); and An indicator (50) is provided on the operating member (20) along a first direction (D1) parallel to the first axis (L1) and is configured to be rotatable relative to the operating member (20) around the first axis (L1); one end of the indicator (50) that passes through the operating member (20) along the first direction (D1) is connected to the output shaft (30) so as to be rotatable coaxially and at the same angle as the output shaft (30); one end of the indicator (50) that passes through the operating member (20) in the opposite direction of the first direction (D1) has an indicator portion (51); the indicator portion (51) is used to be observed to determine the rotation position of the indicator (50) relative to the support body (10).

2. The valve actuator according to claim 1, characterized in that: The operating member (20) comprises an operating shaft (21) whose axial direction is parallel to the first direction (D1), and the operating shaft (21) has a clamping portion (211), and the clamping portion (211) is in the shape of a rotating body with the first axis (L1) as the axis. The supporting body (10) comprises a plurality of clamping members (13), and the plurality of clamping members (13) are distributed around the operating shaft (21) along a circumferential direction perpendicular to the first axis (L1), and each of the clamping members (13) forms a snap connection with the clamping portion (211) to limit the movement of the operating member (20) relative to the supporting body (10) along the first direction (D1) and the opposite direction of the first direction (D1), and the plurality of clamping members (13) can limit the rotation of the operating member (20) relative to the supporting body (10) around the first axis (L1).

3. The valve actuator according to claim 2, characterized in that: The clamping portion (211) has an annular clamping groove (212), the supporting body (10) has a main body (11), one end of each clamping member (13) along the first direction (D1) is fixedly connected to the main body (11), and the other end is freely arranged and has a clamping block (131), and the clamping block (131) is inserted into the clamping groove (212) to form a buckle connection.

4. The valve actuator according to claim 1, characterized in that: The operating member (20) comprises an operating shaft (21) axially parallel to the first direction (D1) and a knob (22); the operating shaft (21) is rotatably connected to the supporting body (10) around the first axis (L1); the knob (22) is located on one side of the operating shaft (21) along the first direction (D1) and is fixedly connected to the operating shaft (21); the indicating member (50) comprises a rotating shaft portion (52) axially parallel to the first direction (D1); the rotating shaft portion (52) is rotatably connected around the first axis (L1) and is passed through the knob (22) and the operating shaft (21); the indicating portion (51) is fixedly connected to one end of the rotating shaft portion (52) passing through the knob (22).

5. The valve actuator according to claim 4, characterized in that: The operating shaft (21) has a limiting portion (213) arranged around the rotating shaft portion (52), and the limiting portion (213) can abut against the rotating shaft portion (52) in the opposite direction of the first direction (D1). The valve actuator also includes a cover body (84), and the cover body (84) is connected to the knob (22) and forms a accommodating cavity (24) with the knob (22) for accommodating the indicating portion (51). The cover body (84) is provided with a pointed portion (841) protruding along the first direction (D1), and the tip of the pointed portion (841) can abut against a portion of the indicating portion (51) that coincides with the first axis (L1) along the first direction (D1).

6. The valve actuator according to claim 5, characterized in that: The transparency of the cover (84) is set so that the indicator (51) can be observed through the cover (84).

7. The valve actuator according to claim 1, characterized in that: The first transmission unit (40) comprises: a first transmission gear (41) configured to be rotatable relative to the support body (10) about the first axis (L1), the operating member (20) being key-connected to the first transmission gear (41); a double gear (42) configured to be rotatable relative to the support body (10) about a second axis (L2) parallel to the first axis (L1), the double gear (42) having a first gear ring (421) and a second gear ring (422), the first gear ring (421) being meshed with the first transmission gear (41); and A second transmission gear (43) is arranged to be rotatable relative to the supporting body (10) around the first axis (L1) and meshed with the second gear ring (422), and the second transmission gear (43) is key-connected to the output shaft (30).

8. The valve actuator according to claim 7, characterized in that: The first transmission gear (41) has an assembly hole (411) extending along the first direction (D1); the operating member (20) is inserted into one end of the assembly hole (411) along the first direction (D1) to be key-connected with the first transmission gear (41); the output shaft (30) is rotatably inserted into the other end of the assembly hole (411) along the first direction (D1) around the first axis (L1); and one end of the indicator (50) passing through the operating member (20) along the first direction (D1) extends into the assembly hole (411) and is inserted into the output shaft (30) to be key-connected with the output shaft (30).

9. The valve actuator according to claim 7, characterized in that: The transmission ratio between the first transmission gear (41) and the first ring gear (421) is greater than 1, and the transmission ratio between the second ring gear (422) and the second transmission gear (43) is greater than 1.

10. The valve actuator according to claim 1, characterized in that: The indicating portion (51) is configured to be a pointer pointing perpendicular to the first axis (L1), and the supporting body (10) is provided with a dial (14) to cooperate with the pointer to determine the rotational position of the indicating member (50) relative to the supporting body (10).

11. The valve actuator according to claim 1, characterized in that: The valve actuator further comprises a motor (60) and a second transmission unit (70), wherein the second transmission unit (70) is transmissionably connected to the motor (60) and the first transmission unit (40), so that the motor (60) can drive the output shaft (30) to rotate via the second transmission unit (70) and the first transmission unit (40).

12. The valve actuator according to claim 11, characterized in that The second transmission unit (70) is a fixed-axis gear train, the fixed-axis gear train includes a fifth transmission gear (73), the fifth transmission gear (73) is rotatably connected to the support body (10) around an axis parallel to the first direction (D1), and the fifth transmission gear (73) can move relative to the support body (10) along the first direction (D1) and the opposite direction of the first direction (D1) to disconnect and connect the transmission route of the fixed-axis gear train. The valve actuator also includes: a first elastic member (81) capable of applying elastic force to the fifth transmission gear (73) so as to maintain the fifth transmission gear (73) in a position connected to the transmission route of the fixed-axis gear train; a separating member (82) movably connected to the supporting body (10) along the first direction (D1) and the opposite direction of the first direction (D1), the separating member (82) being capable of moving along the first direction (D1) to abut against the fifth transmission gear (73) to move the fifth transmission gear (73) to a position where the transmission route of the fixed axis gear train is disconnected; and A second elastic member (83) is capable of applying elastic force to the separation member (82) to enable the separation member (82) to move in a direction opposite to the first direction (D1).

Images