A valve actuator

Abstract

The present invention discloses a valve actuator, which belongs to the technical field of valve actuators. It mainly includes a switching component and an actuator body. The actuator body includes an actuator housing, a spline shaft and a motor. One end of the spline shaft is provided with a first tooth. The switching component includes a cover shell, a hand-turned shaft movably arranged in the cover shell, a manual limit shaft slidably arranged on the cover shell, a manual switching rod rotatably arranged on the cover shell, and a travel switch. The hand-turned shaft is provided with a first limit ring groove and a second limit ring groove at intervals. A second tooth corresponding to the first tooth is provided at one end of the hand-turned shaft. A driven rack is provided at one end of the manual limit shaft. The manual switching rod includes a gripping portion and a spur tooth portion. The travel switch is arranged in the cover shell, and the switch baffle of the travel switch is arranged on the hand-turned shaft. The valve actuator of the present invention can realize the quick switching of the manual and electric modes, and is safe and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of valve actuators, and in particular to a valve actuator. Background Art

[0002] Electric valve actuators are machines that use electricity as the main energy source to drive valves. Valve actuators are generally equipped with a manual mode, which is used to switch the valve actuator to manual mode when the electric actuator is unavailable or in an emergency, so that the valve can be manually controlled; whether the switching between manual and electric modes is simple, fast and safe will directly affect the user experience and the influence of the product.

[0003] Therefore, it is necessary to provide a valve actuator to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a valve actuator, so as to realize quick switching between manual and electric modes, and to be safe and reliable.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a valve actuator; comprising a switching component and an actuator body, the actuator body comprising an actuator housing, a spline shaft rotatably arranged in the actuator housing, and a motor connected to the spline shaft, the spline shaft is provided with a first tooth at one end corresponding to the switching component, the switching component comprises a cover shell, a hand-turned shaft, a manual limit shaft, a manual switching rod and a travel switch, the cover shell is provided with an axial hole that is clearance-matched with the hand-turned shaft, the cover shell is also provided with a sliding hole for the manual limit shaft to slide, a second elastic member is provided in the sliding hole, the cover shell is provided with a bearing hole for the manual switching rod to rotate, the hand-turned shaft is provided with a first limit ring groove and a second limit ring groove at intervals, the hand-turned shaft is provided with a second tooth at one end corresponding to the first tooth, a first elastic member is provided between the first tooth and the second tooth, one end of the manual limit shaft is provided with a driven rack, the manual switching rod is provided with a spur tooth portion meshing with the driven rack, the travel switch is arranged in the cover shell, and the control circuit of the travel switch is connected to the motor.

[0006] Furthermore, the manual switching lever also includes a holding portion connected to the spur tooth portion.

[0007] Furthermore, a bearing and a skeleton oil seal sleeved on the hand-turned shaft are arranged in the shaft hole.

[0008] Furthermore, a switch baffle is provided on the contact of the travel switch, and the switch baffle is rotatably embedded on the hand-turned shaft.

[0009] Furthermore, the actuator body also includes a worm sleeve, a worm wheel and an output shaft arranged in the worm wheel, and the worm wheel is arranged on one side of the worm sleeve and meshes with the worm sleeve.

[0010] Furthermore, a keyway is provided on the inner side wall of the worm sleeve corresponding to the spline shaft.

[0011] Furthermore, a drive shaft is provided on the output end of the motor, and the motor is connected to the spline shaft via the drive shaft.

[0012] Furthermore, a plug is provided on the outer opening of the sliding hole.

[0013] Furthermore, a sealing member is sleeved on the cover shell at a position fixedly fitted with the actuator housing, and the sealing member is an O-ring.

[0014] Furthermore, a hand wheel is provided at one end of the hand-turned shaft extending outside the cover shell.

[0015] Compared with other methods, the present invention has the following beneficial technical effects: a valve actuator of the present invention comprises a switching component and an actuator body, the actuator body comprises a spline shaft and a motor, the switching component comprises a hand-turned shaft, a manual limit shaft, a manual switching rod and a travel switch, the end of the hand-turned shaft is provided with a second tooth embedded in correspondence with the first tooth embedded in the spline shaft, and the switch baffle in the travel switch is arranged on the hand-turned shaft, the hand-turned shaft is pushed to connect with the spline shaft through the second tooth embedded to realize torque transmission, after the hand-turned shaft is connected with the spline shaft, the manual limit shaft is moved by the action of the second elastic member and inserted into the second limit ring groove on the hand-turned shaft, thereby The axial limit of the hand shaft realizes the rapid switching of the manual mode. When the hand shaft moves, it drives the switch baffle to move, thereby closing the control circuit of the travel switch, ensuring that the motor will not start by mistake and cause danger. When switching to the electric mode, the manual switching lever is rotated to drive the manual limit shaft to disengage from the hand shaft. The hand shaft will automatically bounce open under the elastic force of the first elastic member. When the hand shaft bounces open, it drives the switch baffle to move to open the control circuit of the travel switch, and quickly switches the valve actuator to the electric mode, realizing the quick switching of the manual-electric mode. Since the motor can be energized only after the hand shaft is disengaged from the spline shaft, the safety of the mode switching is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] In the figure: Figure 1 It is a structural schematic diagram of a valve actuator of the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of the switching component in the valve actuator shown;

[0019] Figure 3 for Figure 2 A partial cross-sectional schematic diagram of the switching component shown in the top view;

[0020] In the figure:

[0021] Switching component; 11, cover shell; 111, shaft hole; 112, sliding hole; 113, bearing hole; 114, skeleton oil seal; 115, bearing; 116, plug; 117, copper sleeve; 118, sealing member; 12, hand shaft; 121, first limit ring groove; 122, second limit ring groove; 123, second tooth insert; 13, first elastic member; 14, manual limit shaft; 141, driven rack; 15, second elastic member; 16, manual switching lever; 161, spur tooth portion; 162, holding portion; 17, retaining ring; 18, travel switch; 181, switch bracket; 182, switch baffle.

[0022] 200, actuator body; 21, actuator housing; 22, spline shaft; 221, first tooth insert; 23, worm sleeve; 24, worm wheel; 25, output shaft; 26, motor; 261, drive shaft; 27, handwheel. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0024] like Figure 1 As shown, a valve actuator of the present invention includes an actuator body 200 installed on a valve to open, close and regulate the valve, and a switching component 100 installed on the actuator body 200 to manually control the actuator body 200.

[0025] Furthermore, in this embodiment, the actuator body 200 includes an actuator housing 21, a spline shaft 22 arranged in the actuator housing 21, a worm sleeve 23 sleeved on the spline shaft 22, a worm wheel 24 arranged in the actuator housing 21 and corresponding to the worm sleeve 23, an output shaft 25 inserted into the worm wheel 24, and a motor 26 fixedly mounted on the outside of the actuator housing 21.

[0026] The actuator housing 21 is a closed housing structure with a hollow interior. In other embodiments not shown, the actuator housing 21 may be a split structure to facilitate installation or removal of its internal components.

[0027] The spline shaft 22 is rotatably arranged in the inner cavity of the actuator housing 21, and its two ends are inserted into bearings (not marked in the figure) corresponding to the two ends of the spline shaft 22 in the actuator housing 21. The end position of the spline shaft 22 facing the switching component 100 is integrally provided with a first tooth embedment 221.

[0028] A keyway 231 corresponding to the spline on the spline shaft 22 is provided on the inner side wall of the worm sleeve 23 , thereby fixing the worm sleeve 23 circumferentially and transmitting the torque on the spline shaft 22 to the worm sleeve 23 .

[0029] The worm wheel 24 is rotatably disposed inside the actuator housing 21 and is disposed toward one side of the worm sleeve 23 and meshes with the worm sleeve 23 .

[0030] The output shaft 25 is inserted and fixed in the center of the worm gear 24, and is circumferentially fixed to the worm gear 24 by key connection or interference fit. When in use and installation, one end of the output shaft 25 extends to the outside of the actuator housing 21 and is fixedly connected to the actuated element (such as the rotating rod of the valve).

[0031] The motor 26 is fixedly mounted on the outer surface of the actuator housing 21. In this embodiment, the motor 26 is coaxially arranged with the spline shaft 22, and a drive shaft 261 is provided on the power output end of the motor 26. The other end of the drive shaft 261 is fixedly connected to the other end of the spline shaft 22 away from the first tooth embedment 221 through a coupling.

[0032] like Figure 1 The switching component 100 is mounted outside the actuator housing 21 and at a position corresponding to the first tooth 221 on the spline shaft 22. Figure 2 In this embodiment, the switching component 100 includes a cover shell 11, a hand-turned shaft 12 arranged in the cover shell 11, a manual limit shaft 14 slidably arranged on the cover shell 11, a manual switching rod 16 movably arranged on the cover shell 11, and a travel switch 18 arranged in the cover shell 11.

[0033] The center of the cover shell 11 is provided with an axial hole 111 penetrating through both ends of the cover shell 11. A skeleton oil seal 114 is fixed inside the cover shell 11 and at one end of the axial hole 111. A bearing 115 is fixed inside the cover shell 11 and at the other end of the axial hole 111. A copper sleeve 117 is fixedly arranged at a coaxial position between the bearing 115 and the skeleton oil seal 114. In this embodiment, the copper sleeve 117 is an oil-containing copper sleeve. The cover shell 11 is also provided with a sliding hole 112 perpendicular to the axial hole 111. The sliding hole 112 is facing outward. A plug 116 is fixed at the end, the sliding hole 112 is connected to the shaft hole 111, the plug 116 can be fixed to the inner hole of the sliding hole 112 by threaded cooperation, a bearing hole 113 intersecting the sliding hole 112 is provided on the cover shell 11, and a switch bracket 181 for installing the travel switch 18 is also fixedly provided inside the cover shell 11, and a sealing member 118 is sleeved at a position on the cover shell 11 fixedly fitted with the actuator housing 21 to improve the sealing of the connection. In this embodiment, the sealing member 118 is an O-ring.

[0034] The hand shaft 12 is arranged in the shaft hole 111, and the bearing 115, the copper sleeve 117 and the skeleton oil seal 114 are sequentially sleeved on the hand shaft 12. The skeleton oil seal 114 is used to isolate the outside of the shaft hole 111 to prevent dust and other debris from entering and damaging the internal components of the cover shell 11. The copper sleeve 117 is used to radially load the hand shaft 12, and can also lubricate the outer side of the hand shaft 12 to reduce the wear of the hand shaft 12 during use. The bearing 115 is used to improve the rotation flexibility of the hand shaft 12. A first limiting ring groove 121 and a second limiting ring groove 122 are arranged at intervals on the hand-turned shaft 12 at positions corresponding to the sliding hole 112. The hand-turned shaft 12 is integrally provided with a second tooth 123 at one end thereof facing the spline shaft 22. The second tooth 123 corresponds to the first tooth 221 at the end of the spline shaft 22. A first elastic member 13 is sleeved between the first tooth 221 and the second tooth 123. A hand wheel 27 is fixedly sleeved at the end position of the hand-turned shaft 12 extending out of the cover shell 11.

[0035] The manual limit shaft 14 is a cylindrical structure and is slidably disposed in the slide hole 112 . A driven rack 141 is integrally fixed to one end of the manual limit shaft 14 . A second elastic member 15 is disposed in the slide hole 112 and between the manual limit shaft 14 and the plug 116 .

[0036] refer to Figure 3In this embodiment, the manual switching lever 16 includes a gripping portion 162 and a spur gear portion 161 connected to one end of the gripping portion 162. In this embodiment, the gripping portion 162 and the spur gear portion 161 are vertically connected. The spur gear portion 161 is rotatably disposed in the bearing hole 113, and the spur gear portion on the spur gear portion 161 is correspondingly meshed with the driven rack 141 on the manual limit shaft 14, and a retaining ring 17 sleeved on the manual switching lever 16 is fixedly disposed on the inner side wall of the bearing hole 113 to prevent the manual switching lever 16 from being disengaged from the bearing hole 113.

[0037] The travel switch 18 is mounted on a switch bracket 181 inside the cover shell 11. A switch baffle 182 is provided on the contact of the travel switch 18, and the switch baffle 182 is rotatably embedded in the hand-turned shaft 12. The switch baffle 182 can move axially with the hand-turned shaft 12. The control circuit of the travel switch 18 is electrically connected to the motor 26 to control the circuit of the motor 26 to be on and off.

[0038] The working process of the valve actuator of the present invention is described below in conjunction with the accompanying drawings:

[0039] See also Figure 2 Under normal circumstances, the valve actuator of the present invention operates in the electric mode. At this time, the hand shaft 12 is at the rightmost position, the second tooth 123 on the hand shaft 12 is disengaged from the first tooth 221 on the spline shaft 22, and the manual limit shaft 14 is plugged into the first limit ring groove 121. At this time, the travel switch 18 is in the on state. The motor 26 drives the spline shaft 22 to rotate through the drive shaft 261. The spline shaft 22 transmits the torque to the worm sleeve 23 through the key connection. The worm sleeve 23 drives the worm wheel 24 to rotate through meshing, and finally drives the output shaft 25 fixed at the center of the worm wheel 24 to rotate. The output shaft 25 rotates to drive the actuator to move, that is, the actuator (valve) is electrically controlled.

[0040] When the electric mode cannot be used or the manual mode needs to be switched, refer to Figure 2As shown, first, the holding portion 162 on the manual switching lever 16 is toggled to rotate it counterclockwise, thereby driving the spur gear portion 161 to rotate counterclockwise. Since the spur gear portion 161 is meshed with the driven rack 141 on the manual limit shaft 14, the driven rack 141 is driven to move upward against the elastic force of the second elastic member 15, and finally the manual limit shaft 14 is disengaged from the first limit ring groove 121 on the hand shaft 12, thereby releasing the axial movement restriction of the hand shaft 12. Then, the hand wheel 27 is operated to push the hand wheel 27 in the direction of the actuator body 200, driving the hand shaft 12 to overcome the elastic force of the first elastic member 13 and move. Since the switch baffle 182 is sleeved on the hand shaft 12, when the hand shaft 12 moves to the left, it will drive the switch baffle 182 to move to the left at the same time, disconnecting the control circuit of the travel switch 18, and cutting off the power to the motor 26, ensuring the safety of the manual mode. As the hand shaft 12 continues to advance, the hand shaft 12 is finally The second tooth embedment 123 at the end is sleeved with the first tooth embedment 221 on the spline shaft 22, so that the hand-turned shaft 12 and the spline shaft 22 are circumferentially fixedly connected. When the first tooth embedment 221 is matched and connected with the second tooth embedment 123, the manual limit shaft 14 moves downward under the elastic restoring force of the second elastic member 15 and is inserted into the second limit groove 122, thereby limiting the axial deviation of the hand-turned shaft 12, ensuring that the hand-turned shaft 12 will not axially deviate and slide in the manual mode, thereby ensuring the operating reliability of the manual mode. At this time, the spline shaft 22 can be driven to rotate by rotating the hand wheel 27, and the torque is transmitted through the spline shaft 22 through the worm sleeve 23 thereon and the meshing worm wheel 24, thereby driving the output shaft 25 in the center of the worm wheel 24 to rotate, and driving the executed part (valve) at one end of the output shaft 25 to move, thereby realizing manual regulation of the valve, and the worm driving the worm wheel 24 is a labor-saving mechanism, so manual operation is more labor-saving.

[0041] When it is necessary to re-convert the electric mode, it is only necessary to toggle the manual switching lever 16 in the switching component 100 to drive the manual limit shaft 14 to move upward, and finally the manual limit shaft 14 disengages from the second limit ring groove 122 on the hand shaft 12. Since the hand shaft 12 loses the axial limit, the elastic restoring force of the first elastic member 13 pushes the hand shaft 12 to disengage from the spline shaft 22. When the hand shaft 12 moves to the rightmost end, the manual limit shaft 14 moves to the hand shaft 12 under the elastic force of the second elastic member 15. In the first limiting ring groove 121 on the hand shaft 12, the axial limit is automatically set on the hand shaft 12 to prevent the hand shaft 12 from shaking; the hand shaft 12 drives the switch baffle 182 to move to the right during the movement, thereby connecting the control circuit of the travel switch 19. At this time, the motor 26 is turned on, so that the circuit of the motor 26 can be connected only after the hand shaft 12 is disengaged from the spline shaft 22, so that the motor 26 will not be started by mistake and cause a threat to personal safety. In the electric mode, the torque transmission is mainly realized by the engagement of the worm sleeve 23 and the worm wheel 24, and the operation is reliable.

[0042] A valve actuator of the present invention comprises a switching component 100 and an actuator body 200, wherein the actuator body 200 comprises a spline shaft 22 and a motor 26, and the switching component 100 comprises a hand-turned shaft 12, a manual limit shaft 14, a manual switching rod 16 and a travel switch 18, wherein the end of the hand-turned shaft 12 is provided with a second tooth 123 corresponding to the first tooth 221 on the spline shaft 22, and a switch baffle 182 in the travel switch 18 is arranged on the hand-turned shaft 12, and the hand-turned shaft 12 is pushed to connect with the spline shaft 22 through the second tooth 123 to realize torque transmission, and after the hand-turned shaft 12 is connected with the spline shaft 22, the manual limit shaft 14 is moved by the action of the second elastic member 15 and inserted into the second limit ring groove 122 on the hand-turned shaft 12 , thereby limiting the axial position of the hand shaft 12, realizing rapid switching of the manual mode, and when the hand shaft 12 moves, it drives the switch baffle 182 to move, thereby closing the control circuit of the travel switch 18, ensuring that the motor 26 will not start by mistake and cause danger. When switching to the electric mode, the manual switching lever 16 is rotated to drive the manual limit shaft 14 to disengage from the hand shaft 12, and the hand shaft 12 will automatically bounce open under the elastic force of the first elastic member 13. When the hand shaft 12 bounces open, it drives the switch baffle 182 to move to open the control circuit of the travel switch 18, and quickly switches the valve actuator to the electric mode, realizing rapid switching of the manual-electric mode. Since the motor 26 can be energized only after the hand shaft 12 is disengaged from the spline shaft 22, the safety of the mode switching is further improved.

[0043] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the scope of the present invention through the above description. The technical scope of this invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A valve actuator, characterized in that: The invention comprises a switching component (100) and an actuator body (200), wherein the actuator body (200) comprises an actuator housing (21), a spline shaft (22) rotatably arranged in the actuator housing (21), and a motor (26) connected to the spline shaft (22), wherein a first tooth (221) is provided at one end of the spline shaft (22) corresponding to the switching component (100), and the switching component (100) comprises a cover shell (11), a hand-operated shaft (12), , a manual limit shaft (14), a manual switching rod (16) and a travel switch (18), the cover shell (11) is provided with an axial hole (111) which is clearance-matched with the manual rotation shaft (12), the cover shell (11) is also provided with a sliding hole (112) for the manual limit shaft (14) to slide, a second elastic member (15) is provided in the sliding hole (112), the cover shell (11) is provided with a bearing hole (113) for the manual switching rod (16) to rotate, the hand A first limiting ring groove (121) and a second limiting ring groove (122) are arranged at intervals on the rotating shaft (12); a second tooth (123) is arranged at one end of the manual rotating shaft (12) corresponding to the first tooth (221); a first elastic member (13) is arranged between the first tooth (221) and the second tooth (123); a driven rack (141) is arranged at one end of the manual limiting shaft (14); and a driven rack (141) is arranged on the manual switching lever (16) in contact with the driven rack. The rack (141) is meshed with a spur tooth portion (161), the manual switching lever (16) further comprising a gripping portion (162) connected to the spur tooth portion (161), the travel switch (18) being arranged in the cover shell (11), the control circuit of the travel switch (18) being connected to the motor (26), the contact of the travel switch (18) being provided with a switch baffle (182), and the switch baffle (182) being rotatably embedded in the hand-turned shaft (12).

2. The valve actuator according to claim 1, characterized in that: A bearing (115) sleeved on the hand-turned shaft (12) and a skeleton oil seal (114) are arranged in the shaft hole (111).

3. The valve actuator according to claim 1, characterized in that: The actuator body (200) further comprises a worm sleeve (23) arranged on the spline shaft (22), a worm wheel (24), and an output shaft (25) arranged in the worm wheel (24); the worm wheel (24) is arranged on one side of the worm sleeve (23) and meshes with the worm sleeve (23).

4. The valve actuator according to claim 3, characterized in that: A keyway (231) is provided on the inner side wall of the worm sleeve (23) corresponding to the spline shaft (22).

5. The valve actuator according to claim 1, characterized in that: A driving shaft (261) is provided on the output end of the motor (26), and the motor (26) is connected to the spline shaft (22) via the driving shaft (261).

6. The valve actuator according to claim 1, characterized in that: A plug (116) is provided on the outer opening of the sliding hole (112).

7. The valve actuator according to claim 1, characterized in that: A sealing member (118) is sleeved on the cover shell (11) at a position fixedly fitted with the actuator housing (21), and the sealing member (118) is an O-type sealing ring.

8. The valve actuator according to claim 1, characterized in that: A hand wheel (27) is provided at one end of the hand-operated shaft (12) extending outside the cover shell (11).

Images