Electric actuator for valves with adjustable opening

Abstract

The present invention discloses a valve electric actuator with adjustable preset opening, comprising a housing, a main shaft, a clutch mechanism, an adjustment mechanism and a switch mechanism, wherein a motor and a transmission gear set are arranged in the housing; the clutch mechanism connects the motor and the transmission gear set to control the clutch of the two; the adjustment mechanism comprises a rotatable adjustment part; the switch mechanism comprises a cam fixed on the main shaft, a swing frame rotatably sleeved outside the main shaft, a first micro switch fixed on the swing frame and a second micro switch installed in the housing, the motor, the first micro switch and the second micro switch are electrically connected and the cam, the first micro switch and the second micro switch cooperate to trigger the motor switch, and the angle of the swing frame is controlled by rotating the adjustment part. It has the following advantages: the clutch mechanism, the adjustment mechanism and the switch mechanism cooperate with each other to improve the adjustment reliability and safety, and avoid misoperation during the adjustment process.

Description

Technical Field

[0001] The invention relates to the technical field of valve actuators, and in particular to an electric valve actuator with adjustable preset opening. Background Art

[0002] The valve electric actuator drives the valve stem connected to the valve, and drives the valve stem to rotate to control the valve opening and closing. The rotation angle of the valve stem determines the valve opening. The traditional electric actuator drives the valve stem to rotate at a preset angle, and the user cannot perform adjustments. In response to the above shortcomings, some people have proposed an electronic control method to adjust the preset opening, but the electronic control method is costly and has low control accuracy. Summary of the invention

[0003] The present invention provides a valve electric actuator with adjustable preset opening, which overcomes the shortcomings of the valve electric actuator in the background technology.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a valve electric actuator with a preset adjustable opening, comprising a shell and a main shaft rotatably connected to the shell, wherein a motor and a transmission gear set connected to the main shaft are arranged in the shell; further comprising a clutch mechanism, an adjusting mechanism and a switch mechanism; the clutch mechanism connects the motor and the transmission gear set to control the clutch of the two; the adjusting mechanism comprises an adjusting part rotatable relative to the shell, and the adjusting part is provided with a first adjusting gear; the switch mechanism comprises a cam fixed on the main shaft, a swing frame rotatably sleeved outside the main shaft, a first micro switch fixed on the swing frame and a second micro switch installed in the shell, the motor, the first micro switch and the second micro switch are electrically connected and the cam, the first micro switch and the second micro switch cooperate to trigger the motor switch, the swing frame is provided with a second adjusting gear, the first adjusting gear of the adjusting part and the second adjusting gear of the swing frame are meshed to control the angle of the swing frame through the rotation of the adjusting part.

[0005] In one embodiment: the swing frame includes two first sets of plates and a first fixed frame, the first sets of plates can be rotatably sleeved outside the main shaft, the first sets of plates are protrudingly provided with a first lug, and the first fixed frame is fixedly connected between the first lugs of the two first sets of plates; the two first sets of plates are respectively in contact with the two end surfaces of the cam, and the first micro switch is fixedly installed on the first fixed frame; a second set of plates is also installed in the shell, the second set of plates can be rotatably sleeved outside the main shaft, the second set of plates are protrudingly provided with a second lug, the second lug is fixedly connected to the second fixed frame, and the second micro switch is fixedly installed on the second fixed frame.

[0006] In one embodiment, the second lug is provided with an arc groove arranged along the axis of the main shaft, the second plate and the second lug are placed in the housing, and a screw is provided to pass through the arc groove and be locked to the housing.

[0007] In one embodiment, the upper end of the adjusting portion can rotate through the shell, and a knob is fixedly provided on the upper end of the adjusting portion extending out of the shell.

[0008] In one embodiment: an opening indicator disk is fixedly disposed on the housing, and an indicator needle is fixedly disposed on the swing frame. The indicator needle is parallel to the main shaft axis and passes through the corresponding opening indicator disk of the housing.

[0009] In one embodiment: a driving gear is provided at the end of the motor; the clutch mechanism includes a clutch gear set, the clutch gear set includes a clutch tooth and a first transmission gear, and the clutch gear set can slide relative to the housing between a separation position and an engagement position, the clutch tooth in the separation position is separated from the driving gear, and the clutch tooth in the engagement position is engaged with the driving gear, and the first transmission gear is transmission-connected to the clutch tooth and the transmission gear set.

[0010] In one embodiment: the clutch gear set also includes a second transmission gear, a first gear shaft, a third transmission gear and a second gear shaft, the clutch gear and the third transmission gear are coaxially fixed to the first gear shaft, the first transmission gear and the second transmission gear are coaxially fixed to the second gear shaft, the third transmission gear and the second transmission gear are meshed, and the first gear shaft and the second gear shaft slide synchronously.

[0011] In one embodiment: the clutch gear assembly is arranged in the shell; the clutch mechanism also includes a sliding frame, the first gear shaft and the second gear shaft are arranged in parallel and are both rotatably connected to the sliding frame, the first transmission gear is a worm, the clutch gear, the second transmission gear and the third transmission gear are all located in the sliding frame, the first transmission gear can be rotated to extend out of the sliding frame, the sliding frame is provided with an extension rod extending out of the lower shell, and a handle is provided at the end of the extension rod.

[0012] In one embodiment: the lower end of the main shaft is concavely provided with a star-shaped transmission groove, the housing is provided with a through hole, and the lower end of the main shaft is correspondingly adapted to be located in the through hole.

[0013] In one embodiment: the shell includes an upper cover, a middle plate and a lower shell fixed in sequence from top to bottom, and the upper cover, the middle plate and the lower shell are all made of plastic; the transmission gear assembly is arranged in the lower shell, the adjustment mechanism and the switch mechanism are connected between the middle plate and the upper cover, and the main shaft passes through the middle plate and the upper cover; the upper cover is concavely provided with a groove, and is also equipped with a screw and a sealing plug, the screw is arranged in the groove and locks the upper cover and the middle plate, and the sealing plug seals the groove notch.

[0014] Compared with the background technology, this technical solution has the following advantages:

[0015] The valve electric actuator also includes a clutch mechanism, an adjusting mechanism and a switching mechanism. The adjusting part drives the swing frame to swing so as to change the angle of the swing frame and the first micro switch arranged on the swing frame, so as to change the central angle between the first micro switch and the second micro switch, that is, to change the preset opening of the valve; moreover, the clutch mechanism, the adjusting mechanism and the switching mechanism cooperate with each other to improve the reliability and safety of the adjustment and avoid misoperation during the adjustment process.

[0016] The clutch gear set can slide between a disengaged position and an engaged position relative to the housing, the clutch teeth in the disengaged position are separated from the drive gear, and the clutch teeth in the engaged position are engaged with the drive gear. The first transmission gear is transmission-connected between the clutch gear and the transmission gear set, and the release control is convenient, stable and reliable.

[0017] The clutch gear and the third transmission gear are coaxially fixed to the first gear shaft, the first transmission gear and the second transmission gear are coaxially fixed to the second gear shaft, the third transmission gear and the second transmission gear are meshed, and the first gear shaft and the second gear shaft slide synchronously, which can ensure stable and reliable clutch control, reduce speed, and have a compact structure.

[0018] The clutch gear, the second transmission gear and the third transmission gear are all located in the sliding frame. The first transmission gear can rotate and extend out of the sliding frame. The sliding frame is provided with an extension rod extending out of the lower shell. A handle is provided at the end of the extension rod. The structure is compact and easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Figure 1 It is one of the three-dimensional schematic diagrams of the valve electric actuator according to the specific implementation method.

[0021] Figure 2 This is the second three-dimensional schematic diagram of the valve electric actuator according to the specific implementation method.

[0022] Figure 3 It is a three-dimensional cutaway schematic diagram of a valve electric actuator according to a specific implementation method.

[0023] Figure 4 It is a three-dimensional exploded schematic diagram of a valve electric actuator according to a specific implementation method.

[0024] Figure 5 It is one of the three-dimensional cutaway schematic diagrams of a transmission gear set and a clutch mechanism, etc. of a specific implementation method.

[0025] Figure 6 This is the second three-dimensional cutaway schematic diagram of the transmission gear set and clutch mechanism of the specific implementation method.

[0026] Figure 7It is a specific application example of the valve electric actuator of the specific implementation method. DETAILED DESCRIPTION

[0027] Please refer to Figures 1 to 6 The electric valve actuator with a preset adjustable opening comprises a housing 1, a main shaft 2 rotatably connected to the housing 1, a clutch mechanism 3, a regulating mechanism 4 and a switch mechanism 5.

[0028] The housing 1 is provided with a motor 11 and a transmission gear set 12 which is connected to the main shaft 2; the clutch mechanism 3 connects the motor 11 and the transmission gear set 12 to control the clutch of the two; the adjustment mechanism 4 includes an adjustment part 41 which can rotate relative to the housing 1, and the adjustment part 41 is provided with a first adjustment gear 42; the switch mechanism 5 includes a cam 51 fixed to the main shaft 2, a swing frame which can be rotatably sleeved outside the main shaft 2, a first micro switch 53 fixed to the swing frame, and a second micro switch 54 installed in the housing 1. The first micro switch 53 and the second micro switch 54 are electrically connected and the cam 51, the first micro switch 53 and the second micro switch 54 cooperate to trigger the switch of the motor 11, so the cam 51 can touch the micro switch control switch to realize automatic switch control; the swing frame is provided with a second adjusting gear 55, and the first adjusting gear 42 of the adjusting part 41 and the second adjusting gear 54 of the swing frame are engaged to control the angle of the swing frame by rotating the adjusting part 41, so the central angle of the two micro switches can be controlled by rotating the adjusting part, and the valve opening can be controlled.

[0029] The housing 1 comprises an upper cover 13, a middle plate 14 and a lower shell 15 which are fixed in sequence from top to bottom. The upper cover 13, the middle plate 14 and the lower shell 15 are all made of plastic, which has good anti-corrosion effect and light weight. A first screw 141 is provided to lock the middle plate 14 and the lower shell 15 from top to bottom, and the screw head of the first screw 141 is exposed between the upper cover 13 and the middle plate 14. The upper cover 13 is concavely provided with a groove 131, and a second screw 132 and a sealing plug 133 are also provided. The second screw 132 is arranged in the groove 131 and locks the upper cover 13 and the middle plate 14. The sealing plug 133 seals the notch of the first groove 132 to prevent the second screw from being corroded. The sealing is realized by the above structure to prevent the screw from being corroded. The upper cover 13, the lower shell 15 and the sealing plug 133 are made of ABS material, and the middle plate 14 is made of 14PA6+30%GF material.

[0030] The swing frame includes two first sets of plates 521 and a first fixed frame 522. The first sets of plates 521 can be rotatably sleeved on the outside of the main shaft 2. The first sets of plates 521 are convexly provided with a first lug. The first fixed frame 522 is fixedly connected between the first lugs of the two first sets of plates 521. The two first sets of plates 521 are respectively in contact with the two end surfaces of the cam 51. The first micro switch 53 is fixedly arranged on the first fixed frame 522. The positioning and assembly are convenient, the structure is compact, stable and reliable, and the adjustment is convenient and accurate. The housing 1 is also equipped with a second set of plates. 161, the second set plate 161 can be rotatably sleeved on the outside of the main shaft 2, the second set plate 161 is convexly provided with a second lug, and the second lug is fixedly connected to a second fixing frame 162, the second micro switch 54 is fixedly arranged on the second fixing frame 162, the structure is compact, and the positioning and assembly are convenient; the second lug is provided with an arc groove 163 arranged along the axis of the main shaft, the second set plate and the second lug are placed in the middle plate 14, and a third screw is provided to pass through the arc groove and locked to the middle plate 14, so that the angle of the second micro switch can be adjusted.

[0031] The upper end of the adjusting part 41 can rotate through the upper cover 13, and the upper end of the adjusting part extending out of the upper cover 13 is fixed with a knob 411 for user adjustment. The upper cover 13 is fixed with an opening indicator plate 131, and the swing frame is fixed with an indicator needle 523, which is parallel to the main shaft axis and passes through the corresponding opening indicator plate of the housing, so that the user can visually observe the adjustment opening, such as the preset opening arrow points to 90 degrees, the output shaft is opened by 90 degrees, and the preset opening arrow points to 45 degrees, and the output shaft is opened by 45 degrees.

[0032] A driving gear 111 is provided at the end of the motor 11; the clutch mechanism 3 includes a clutch gear set, which includes a clutch tooth 31 and a first transmission gear 32. The clutch gear set can slide between a separation position and an engagement position relative to the housing 1. The clutch tooth 31 in the separation position is separated from the driving gear 111, and the clutch tooth 31 in the engagement position is engaged with the driving gear 111. The first transmission gear 32 is transmission-connected to the clutch gear 31 and the transmission gear set 12. The clutch gear set also includes a second transmission gear 33, a first gear shaft 34, a third transmission gear 35 and a second gear shaft 36, the clutch gear 31 and the third transmission gear 35 are coaxially fixed to the first gear shaft 34, the first transmission gear 32 and the second transmission gear 33 are coaxially fixed to the second gear shaft 36, the third transmission gear 35 and the second transmission gear 33 are meshed, and the first gear shaft 34 and the second gear shaft 35 slide synchronously; the clutch mechanism 3 also includes a sliding frame 37, the first gear shaft 35 and the second gear shaft 36 are arranged in parallel and are both rotatably connected to the sliding frame, the clutch gear 31, the second transmission gear 33 and the third transmission gear 35 are all located in the sliding frame, the first transmission gear 32 can be rotated and extended out of the sliding frame, and the first transmission gear 32 is a worm. With the above clutch structure, the clutch is stable and reliable, and the operation is convenient and simple.

[0033] The transmission gear set 12 and the clutch mechanism 3 are installed in the lower shell 15. The sliding frame 37 is provided with an extension rod extending out of the lower shell, and a handle 38 is provided at the end of the extension rod; the adjustment mechanism 4 and the switch mechanism 5 are connected between the middle plate and the upper cover, and the main shaft 2 passes through the middle plate and the upper cover.

[0034] The lower end of the main shaft 2 is concavely provided with a star-shaped transmission groove 21, and the lower shell 15 is provided with a through hole, and the lower end of the main shaft is correspondingly adapted to be located in the through hole. The star-shaped transmission groove 21 is a standard star-shaped hole, which can be directly inserted into the valve stem without the need for a bracket and a coupling, thus simplifying the structure, making the structure simple and compact, and assembling conveniently and quickly. Figure 7 The star-shaped transmission groove 21 of the main shaft of the electric actuator can be directly sleeved on the valve stem of the valve 6, which is easy to operate.

[0035] The above description is only a preferred embodiment of the present invention, and therefore cannot be used to limit the scope of the present invention. That is, equivalent changes and modifications made according to the patent scope of the present invention and the contents of the specification should still fall within the scope of the present invention.

Claims

1. An electric valve actuator with adjustable preset opening, comprising a housing and a main shaft rotatably connected to the housing, wherein a motor and a transmission gear set connected to the main shaft are arranged in the housing; the characteristics are: It also includes a clutch mechanism, an adjustment mechanism and a switch mechanism; the clutch mechanism connects the motor and the transmission gear set to control the clutch of the two; the adjustment mechanism includes an adjustment part that can rotate relative to the shell, and the adjustment part is provided with a first adjustment gear; the switch mechanism includes a cam fixed on the main shaft, a swing frame that can be rotatably sleeved outside the main shaft, a first micro switch fixed on the swing frame and a second micro switch installed in the shell, the motor, the first micro switch and the second micro switch are electrically connected and the cam, the first micro switch and the second micro switch cooperate to trigger the motor switch, the swing frame is provided with a second adjustment gear, the first adjustment gear of the adjustment part and the swing frame The second adjusting gear is meshed to control the angle of the swing frame through the rotation of the adjusting part; the swing frame includes two first sets of plates and a first fixed frame, the first sets of plates can be rotatably sleeved outside the main shaft, the first sets of plates are convexly provided with a first lug, and the first fixed frame is fixedly connected between the first lugs of the two first sets of plates; the two first sets of plates are respectively in contact with the two end surfaces of the cam, and the first micro switch is fixedly installed on the first fixed frame; a second set of plates is also installed in the housing, the second set of plates can be rotatably sleeved outside the main shaft, the second set of plates are convexly provided with a second lug, the second fixed frame is fixedly connected to the second lug, and the second micro switch is fixedly installed on the second fixed frame; the second lug is provided with a slot along the main shaft The arc groove is arranged in a line, the second set plate and the second lug are placed in the shell, and a screw is provided to pass through the arc groove and lock it to the shell; a driving gear is provided at the end of the motor; the clutch mechanism includes a clutch gear set, and the clutch gear set includes a clutch tooth and a first transmission gear, which can slide between a separation position and an engagement position relative to the shell through the clutch gear set, the clutch tooth in the separation position is separated from the driving gear, and the clutch tooth in the engagement position is engaged with the driving gear, and the first transmission gear is transmission-connected to the clutch tooth and the transmission gear set; the clutch gear set also includes a second transmission gear, a first gear shaft, a third transmission gear and a second gear shaft, the clutch tooth and The third transmission gear is coaxially fixed to the first gear shaft, the first transmission gear and the second transmission gear are coaxially fixed to the second gear shaft, the third transmission gear and the second transmission gear are meshed, and the first gear shaft and the second gear shaft slide synchronously; the clutch gear set is arranged in the shell; the clutch mechanism also includes a sliding frame, the first gear shaft and the second gear shaft are arranged in parallel and are both rotatably connected to the sliding frame, the first transmission gear is a worm gear, the clutch gear, the second transmission gear and the third transmission gear are all located in the sliding frame, the first transmission gear can be rotatably extended out of the sliding frame, the sliding frame is provided with an extension rod extending out of the lower shell, and a handle is provided at the end of the extension rod.

2. The electric valve actuator with adjustable preset opening according to claim 1, characterized in that: The upper end of the adjusting part can be rotated to pass through the shell, and a knob is fixedly arranged on the upper end of the adjusting part extending out of the shell.

3. The electric valve actuator with adjustable preset opening according to claim 1, characterized in that: An opening indicator disk is fixedly arranged on the housing, and an indicator needle is fixedly arranged on the swing frame. The indicator needle is parallel to the main shaft axis and passes through the corresponding opening indicator disk of the housing.

4. The electric valve actuator with adjustable preset opening according to claim 1, characterized in that: The lower end of the main shaft is concavely provided with a star-shaped transmission groove, the housing is provided with a through hole, and the lower end of the main shaft is correspondingly adapted to be located in the through hole.

5. The electric valve actuator with adjustable preset opening according to claim 1, characterized in that: The shell includes an upper cover, a middle plate and a lower shell fixed in sequence from top to bottom, and the upper cover, the middle plate and the lower shell are all made of plastic; the transmission gear assembly is arranged in the lower shell, the adjustment mechanism and the switch mechanism are connected between the middle plate and the upper cover, and the main shaft passes through the middle plate and the upper cover; the upper cover is concavely provided with a groove, and is also equipped with a screw and a sealing plug, the screw is arranged in the groove and locks the upper cover and the middle plate, and the sealing plug seals the groove notch.

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