Interlockable manual-electric changeover mechanism for valve electric actuator

Abstract

The present invention provides an interlockable manual-electric switching mechanism for a valve electric device, which includes a housing, a motor, an electric worm, and a microswitch. The microswitch is fixed on the inner wall of the housing. The electric worm is connected to the output shaft of the valve through a worm gear. The mechanism further includes a state holding mechanism and a clutch mechanism, and the control state is changed by rotating a switching rod. This manual-electric switching mechanism for the valve electric device can achieve interlock in both manual and electric states, can visually observe the real-time state, prevent accidental touch, and has extremely high safety.

Description

Technical Field

[0001] The present invention belongs to the technical field of valve electric devices, and particularly relates to an improvement of the manual-electric switching mechanism in a valve electric device. Background Art

[0002] In a valve electric device, the manual-electric switching mechanism is an indispensable part, and its function is to enable the valve electric device to not only have the function of driving the valve to work electrically, but also have the function of manually operating the valve to work under certain circumstances.

[0003] The existing manual-electric switching mechanism of a valve electric device includes a motor, an output shaft, a worm gear, an electric worm, a clutch mechanism, and a handwheel. In the electric state, the clutch mechanism disengages the handwheel and the electric worm, and the motor drives the electric worm, which drives the output shaft through the worm gear to control the opening and closing of the valve. In the manual state, the clutch mechanism connects the handwheel and the electric worm, enabling the handwheel to control the rotation of the electric worm, and further controlling the opening and closing of the valve.

[0004] Such a structure has the following technical problems: Only by pulling the clutch mechanism between the electric worm and the handwheel to switch the manual-electric state, and the clutch mechanism is located inside the device, and it cannot intuitively display the current manual-electric state of the device, resulting in the possibility of the electric device being accidentally powered on during manual operation. Since the rotational speed of the electric worm is very high, it is easy to damage the switching mechanism or cause injury.

[0005] Therefore, it is urgently necessary to design a manual-electric switching mechanism for a valve electric device that can be intuitively displayed and has an interlocking function, which can effectively solve the above problems and improve the safety of manual operation. Summary of the Invention

[0006] In view of the above technical problems, the present invention provides a manually and electrically interlockable switching mechanism for a valve electric device. The manually and electrically interlockable switching mechanism for a valve electric device can achieve interlocking in the manual or electric state, can intuitively observe the real-time state, prevent accidental touch, and has extremely high safety.

[0007] The technical solution of the present invention is: A manually and electrically interlockable switching mechanism for a valve electric device, including a housing, a motor, an electric worm, and a microswitch. The microswitch is fixed on the inner wall of the housing. The electric worm is connected to the output shaft of the valve through a worm gear, and further includes a state holding mechanism and a clutch mechanism;

[0008] The state holding mechanism includes a cam, a transmission shaft, a shaft sleeve, a knob shaft, and a switching rod;

[0009] The knob shaft has a shaft handle and a shaft cylinder. The knob shaft is movably connected to the outer shell through the shaft handle. The shaft handle part of the knob shaft extends out of the outer shell, and a switching rod is fixedly connected to the extended part of the shaft handle. The shaft sleeve is cylindrical. The shaft cylinder of the knob shaft extends into the cylindrical opening of the shaft sleeve and is in a pivotally connected state. The shaft sleeve is fixedly connected to the inner wall of the outer shell.

[0010] A positioning structure is provided between the end face of the shaft cylinder of the knob shaft and the bottom of the shaft sleeve.

[0011] One end of the transmission shaft is fixedly connected to the bottom of the shaft cylinder of the knob shaft, and the other end penetrates through the shaft sleeve and extends out of the outer end of the shaft sleeve. The cam is fixedly connected to the shaft head of the transmission shaft extending out of the outer end of the shaft sleeve, and the position of the cam matches the position of the contact of the microswitch.

[0012] The clutch mechanism includes a transmission shaft sleeve, a handwheel shaft and a clutch compression spring. The transmission shaft sleeve is fixedly arranged in the outer shell. The electric worm extends into the outer shell and is connected to one end of the transmission shaft sleeve. The other end of the transmission shaft sleeve is provided with a clutch transmission structure one.

[0013] The handwheel shaft has a shaft handle section and a clutch disc. The shaft handle section penetrates through the outer shell and can rotate freely and move axially relative to the outer shell. The end face of the clutch disc facing the transmission shaft sleeve is provided with a clutch transmission structure two. The clutch compression spring is arranged between the back of the clutch disc and the outer shell. When the handwheel shaft is controlled to move axially, the combination and separation between the clutch transmission structure one and the clutch transmission structure two are realized.

[0014] The switching rod can be clamped with the handwheel shaft after being driven to rotate by the knob shaft.

[0015] Preferably, the positioning structure is as follows: an installation round hole is provided on the shaft cylinder, a compression spring is arranged in the installation round hole, a ball is arranged on the side of the compression spring close to the shaft sleeve, two grooves matching the ball are provided on the shaft sleeve, a boss is also provided on the shaft cylinder, and a waist-shaped groove corresponding to the rotation track of the boss is provided on the shaft sleeve.

[0016] Preferably, the electric worm is connected to the transmission shaft sleeve through a spline.

[0017] Preferably, the way of fixing the switching rod to the rotating shaft is as follows: a circle of installation grooves is provided on the rotating shaft, the switching rod is sleeved in the installation groove, and a shaft retaining ring is arranged in the installation groove for fastening the switching rod.

[0018] Preferably, the structure of the handwheel shaft clamped with the switching rod is as follows: a circle of clamping grooves is provided on the handwheel shaft, and a U-shaped notch matching the groove is provided on the switching rod.

[0019] Preferably, the cam includes a camshaft and a cam block, and the cam block is arranged on the side of the camshaft.

[0020] Preferably, the connection mode between the transmission shaft and the rotating shaft is as follows: a flat hole is provided at the bottom of the shaft cylinder, and a corresponding flat hole is provided on the rotating shaft.

[0021] Preferably, both the clutch transmission structure one and the clutch transmission structure two are two-claw structures.

[0022] The beneficial effects of the present invention are as follows: by rotating the switching rod, the switching rod drives the cam to rotate in the manual state, touching the microswitch to disconnect the power supply of the motor, ensuring that the electric device will not operate during manual operation; in the electric state, the switching rod is clamped with the handwheel shaft, the handwheel shaft is disengaged from the transmission shaft sleeve, and further the handwheel is disengaged from the electric worm, and the electric worm and the handwheel shaft can be completely disconnected from each other. Mutual locking in the manual and electric states is realized, and the safety of valve operation is ensured at the same time.

[0023] The mechanism of the present invention needs to rotate the switching rod and position it first to complete the switching between the hand - electric states, which has the function of preventing accidental touch. The change in the position of the switching rod can visually display the current hand - electric state of the device, playing an obvious prompting role. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of the present invention in the electric state,

[0025] Figure 2 is a schematic structural diagram of the present invention in the manual state,

[0026] Figure 3 is a perspective view of the state - holding mechanism in the present invention,

[0027] Figure 4 is a schematic structural diagram of the state - holding mechanism in the present invention,

[0028] Figure 5 is Figure 4 the view in the A direction in

[0029] Figure 6 is a perspective view of the microswitch in the present invention,

[0030] Figure 7 is a schematic diagram of the internal structure of the state - holding mechanism in the present invention,

[0031] Figure 8 is Figure 7 the sectional view taken along B - B in

[0032] Figure 9 is a perspective view of the cam in the present invention,

[0033] Figure 10It is a schematic structural view of the cam in the present invention,

[0034] Figure 11 It is a perspective view of the bushing in the present invention,

[0035] Figure 12 It is a schematic structural view of the bushing in the present invention,

[0036] Figure 13 It is a perspective view of the knob shaft in the present invention,

[0037] Figure 14 It is a perspective view of the knob shaft from another angle in the present invention,

[0038] Figure 15 It is a schematic structural view of the knob shaft in the present invention,

[0039] Figure 16 It is Figure 15 the left view of,

[0040] Figure 17 It is a perspective view of the transmission shaft bushing in the present invention,

[0041] Figure 18 It is a perspective view of the transmission shaft bushing from another angle in the present invention,

[0042] Figure 19 It is a schematic structural view of the transmission shaft bushing in the present invention,

[0043] Figure 20 It is a schematic structural view of the handwheel shaft in the present invention,

[0044] Figure 21 It is a schematic structural view of the valve driving part in the present invention;

[0045] In the figure, 1 is the outer shell, 2 is the microswitch, 21 is the contact, 3 is the switching lever, 4 is the knob shaft, 40 is the shaft cylinder, 41 is the mounting round hole, 42 is the boss, 43 is the shaft handle, 5 is the bushing, 51 is the groove, 52 is the waist-shaped groove, 6 is the compression spring, 7 is the ball, 8 is the transmission shaft, 9 is the cam, 91 is the cam shaft, 92 is the cam block, 10 is the protective cover, 11 is the shaft circlip, 12 is the socket head cap screw, 13 is the handwheel shaft, 131 is the clutch transmission structure II, 132 is the card slot, 133 is the shaft handle section, 134 is the clutch disc, 14 is the transmission shaft bushing, 141 is the clutch transmission structure I, 15 is the electric worm, 16 is the clutch compression spring, 17 is the handwheel, 18 is the turbine, 19 is the output shaft, 20 is the motor. Detailed implementation manners

[0046] The technical solution of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the invention without creative efforts shall fall within the scope of protection of the invention.

[0047] In the description of the invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "upright", "transverse", "inner", "outer", "front", "back", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0048] Figures 1 to 21 The middle is an interlockable manual and electric switching mechanism for a valve electric device, including a housing 1, a motor, an electric worm 15 and a microswitch 2. The microswitch 2 is arranged inside the housing 1. In this embodiment, a protective cover 10 is provided outside the microswitch 2 through a pan head screw 12. The microswitch 2 is fixed on the inner wall of the housing 1. The microswitch 2 is electrically connected to the motor 20. The motor 20 is connected to the electric worm 15, and the electric worm 15 is connected to the output shaft 19 of the valve through a worm gear 18 to control the opening and closing of the valve. The above components and the connection methods between the components are all conventional technologies and will not be elaborated here. It further includes a state holding mechanism and a clutch mechanism.

[0049] See Figures 3 to 15 , the state holding mechanism includes a cam 9, a transmission shaft 8, a bushing 5, a knob shaft 4 and a switching rod 3;

[0050] The knob shaft 4 has a shaft handle 43 and a shaft barrel 40. The knob shaft 4 is movably connected to the housing 1 through the shaft handle 43 of the knob shaft 4. The shaft handle 43 part of the knob shaft 4 extends out of the housing 1, and a switching rod 3 is fixedly connected to the extended part of the shaft handle 43; the bushing 5 is in a cylindrical shape, and the shaft barrel 40 of the knob shaft 4 extends into the cylindrical opening of the bushing 5 and is in a pivotally connected state; the bushing 5 is fixedly connected to the inner wall of the housing 1; a positioning structure is provided between the end face of the shaft barrel 40 of the knob shaft 4 and the bottom of the bushing 5;

[0051] One end of the transmission shaft 8 is fixedly connected to the bottom of the shaft barrel 40 of the knob shaft 4, and the other end penetrates through the bushing 5 and extends out of the outer end of the bushing 5. The cam 9 is fixedly connected to the shaft head of the transmission shaft 8 extending out of the outer end of the bushing 5. The position of the cam 9 matches the position of the contact 21 of the microswitch 2;

[0052] See Figure 1 , Figure 2 and Figures 16 to 20, the clutch mechanism includes a drive shaft sleeve 14, a handwheel shaft 13, and a clutch compression spring 16. The drive shaft sleeve 14 is fixedly arranged in the housing 1. The electric worm 15 extends into the housing 1 and is connected to one end of the drive shaft sleeve 14. A first clutch transmission structure 141 is provided at the other end of the drive shaft sleeve 14;

[0053] The handwheel shaft 13 has a shaft handle section 133 and a clutch disc 134. The shaft handle section 133 penetrates through the housing 1 of the shell and can rotate freely and move axially relative to the housing 1. A handwheel 17 is fixed to the outer end of the shaft handle section 133; A second clutch transmission structure 131 is provided on the end face of the clutch disc 134 facing the drive shaft sleeve 14; The clutch compression spring 16 is arranged between the back of the clutch disc 134 and the housing 1; When the handwheel shaft 13 is axially moved, the combination and separation between the first clutch transmission structure 131 and the second clutch transmission structure 141 are realized;

[0054] After the switching rod 3 is driven to rotate by the knob shaft 4, it can be clamped with the handwheel shaft 13. The rotation amplitude is controlled within 45 - 90°, which is determined by the radian of the kidney-shaped groove 52.

[0055] See Figures 12 to 15 , in this embodiment, the positioning structure is as follows: There is an installation round hole 41 on the shaft cylinder 40. A compression spring 6 is arranged in the installation round hole 41. A ball 7 is arranged on the side of the compression spring 6 close to the shaft sleeve 5. There are two grooves 51 on the shaft sleeve 5 that match the ball 7. In this embodiment, the groove 51 is a spherical groove. There is also a boss 42 on the shaft cylinder 40. There is a kidney-shaped groove 52 on the shaft sleeve 5 corresponding to the rotation track of the boss 42. Through the cooperation of the boss 42 and the kidney-shaped groove 52, the rotation angle of the knob shaft 4 rotating in the shaft sleeve 5 is restricted, ensuring that the ball 7 can rotate with the rotating shaft 4 into the two grooves 51.

[0056] See Figure 1 and Figure 17 , in this embodiment, the electric worm 15 is connected to the drive shaft sleeve 14 through a spline.

[0057] See Figure 7 , in this embodiment, the way the switching rod 3 is fixed to the rotating shaft 4 is as follows: There is a circle of installation grooves on the rotating shaft 4. The switching rod 3 is sleeved in the installation groove. A shaft retaining ring 11 is arranged in the installation groove for fastening the switching rod 3. The shaft retaining ring 11 is a conventional component, and the specific installation method will not be elaborated.

[0058] See Figure 1 , Figure 3 and Figure 4 , in this embodiment, the structure of the handwheel shaft 13 that is clamped with the switching rod 3 is as follows: There is a circle of card slots 132 on the handwheel shaft 13. The switching rod 3 is provided with a U-shaped notch that matches the card slots 132.

[0059] See Figure 9 and Figure 10, the cam 9 includes a camshaft 91 and a cam block 92, and the cam block 92 is provided on the side of the camshaft 91. It should be noted that 2 bumps are correspondingly arranged on the camshaft, and correspondingly, two microswitches 2 are also provided, which is safer and more reliable.

[0060] See Figure 1 and Figure 15 , in this embodiment, the connection method between the transmission shaft and the rotating shaft is: a flat hole is provided at the bottom of the shaft cylinder, and a corresponding flat hole is provided on the rotating shaft.

[0061] See Figures 17 to 20 , in this embodiment, both the clutch transmission structure one and the clutch transmission structure two are two-claw structures, and the sides of the two claws of the two are in contact with each other to achieve transmission.

[0062] The operation method of this embodiment: See Figure 1 , when it is necessary to maintain the electric state, pull the handwheel shaft 13 outwards, the handwheel shaft 13 is disengaged from the transmission shaft sleeve 14, use the motor to control the electric worm 15, and then control the valve. At the same time, rotate the switching rod 3 clockwise. At this time, the ball 7 just rotates into a groove 51 on the shaft sleeve, and the U-shaped notch of the switching rod 3 just catches into the card slot 131 of the handwheel shaft 13. The handwheel shaft 13 cannot be engaged with the transmission shaft sleeve 14, and the electric state can be effectively maintained. At this time, the valve electric device can safely perform electric operation.

[0063] See Figure 1 , 2 , when manual operation is required, rotate the switching rod 3 counterclockwise. The switching rod 3 disengages from the card slot 131. Under the action of the clutch compression spring 16, the end face of the handwheel shaft 13 is engaged with the end face of the transmission shaft 8 sleeve. Rotate the handwheel 17 to control the electric worm 15, and then control the valve. At the same time, the switching rod 3 drives the knob shaft 4 and the transmission shaft 8 to rotate synchronously. The transmission shaft 8 drives the cam 9 to rotate. When rotating to the manual state position, the ball just rotates into another groove 51 of the shaft sleeve and realizes the manual holding state through the compression spring 6. At this time, the cam 9 touches the contact 21 of the microswitch 2 synchronously, disconnects the microswitch 2, and cuts off the control circuit. The electric device cannot be powered on for electric operation, which improves the safety of manual operation.

[0064] The staff can switch the position of the switching rod 3 to determine whether the equipment is currently in the manual or electric state.

[0065] The present invention is not limited to the above embodiments. Based on the technical solutions disclosed in the invention, those skilled in the art can make some substitutions and deformations of some technical features without creative labor according to the disclosed technical content, and these substitutions and deformations are all within the protection scope of the invention.

Claims

1. Interlockable manual-electric switching mechanism for valve electric actuator, comprising a housing, a motor, an electric worm and a microswitch, the microswitch being fixed to the inner wall of the housing, the electric worm being connected to the output shaft of the valve through a worm gear, characterized in that, It further includes a state holding mechanism and a clutch mechanism; The state holding mechanism includes a cam, a transmission shaft, a shaft sleeve, a knob shaft and a switching lever; the knob shaft has a shaft handle and a shaft cylinder, the knob shaft is movably connected to the outer shell through the shaft handle, a part of the shaft handle of the knob shaft extends out of the outer shell, and the extended part of the shaft handle is fixedly connected with the switching lever; the shaft sleeve is cylindrical, the shaft cylinder of the knob shaft extends into the cylindrical opening of the shaft sleeve and is in a pivotally connected state; the shaft sleeve is fixedly connected to the inner wall of the outer shell; a positioning structure is provided between the end face of the shaft cylinder of the knob shaft and the bottom of the shaft sleeve; one end of the transmission shaft is fixedly connected to the bottom of the shaft cylinder of the knob shaft, the other end penetrates through the shaft sleeve and extends out of the outer end of the shaft sleeve, and the cam is fixedly connected to the shaft head of the transmission shaft extending out of the outer end of the shaft sleeve, and the position of the cam matches the position of the contact of the microswitch; The clutch mechanism includes a transmission shaft sleeve, a handwheel shaft and a clutch compression spring; the transmission shaft sleeve is fixedly arranged in the outer shell, the electric worm extends into the outer shell and is connected to one end of the transmission shaft sleeve, and a first clutch transmission structure is provided at the other end of the transmission shaft sleeve; the handwheel shaft has a shaft handle section and a clutch disc, the shaft handle section penetrates through the shell of the outer shell and can rotate freely and move axially relative to the outer shell; a second clutch transmission structure is provided on the end face of the clutch disc facing the transmission shaft sleeve; the clutch compression spring is arranged between the back of the clutch disc and the outer shell; so that when the handwheel shaft is manipulated to move axially, the combination and separation between the first clutch transmission structure and the second clutch transmission structure are realized; The switching lever can be clamped with the handwheel shaft after being driven to rotate by the knob shaft; The positioning structure is: an installation round hole is provided on the shaft cylinder, a compression spring is arranged in the installation round hole, a ball is arranged on the side of the compression spring close to the shaft sleeve, two grooves matching the ball are provided on the shaft sleeve, a boss is further provided on the shaft cylinder, and a kidney-shaped groove corresponding to the rotation track of the boss is provided on the shaft sleeve.

2. The interlockable valve electric device manual-electric switching mechanism according to claim 1, wherein The electric worm is connected to the transmission shaft sleeve through a spline.

3. The electric - manual switching mechanism of the interlockable valve electric device according to claim 1, characterized in that, The way of fixedly connecting the switching lever to the rotating shaft is: a circle of installation groove is provided on the rotating shaft, the switching lever is sleeved in the installation groove, and a shaft retaining ring is arranged in the installation groove for fastening the switching lever.

4. The interlockable electric valve device manual-electric changeover mechanism according to claim 1, characterized in that, The structure of the handwheel shaft clamped with the switching lever is: a circle of clamping groove is provided on the handwheel shaft, and a U-shaped notch matching the groove is provided on the switching lever.

5. The interlockable electric valve device manual-electric changeover mechanism according to claim 1, characterized in that, The cam includes a camshaft and a cam block, and the cam block is arranged on the side of the camshaft.

6. The interlockable valve electric device manual-electric changeover mechanism according to claim 1, characterized in that, The connection mode of the transmission shaft and the rotating shaft is: a flat hole is provided at the bottom of the shaft cylinder, and a corresponding flat hole is provided on the rotating shaft.

7. The interlockable valve electric device manual-electric changeover mechanism according to claim 1, characterized in that, Both the first clutch transmission structure and the second clutch transmission structure are two-claw structures.

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