Electric valve actuator

Abstract

The utility model discloses an electric valve actuator, which adopts a gear set as a transmission mechanism, a first positioning part and a second positioning part are arranged on a rotating shaft at intervals in the circumferential direction, and a first blocking piece matched with the first positioning part and a second blocking piece matched with the second positioning part are arranged on a shell. When the rotating shaft rotates to the full-open position of the corresponding switch type valve in the first hour hand direction, the first positioning part abuts against the first blocking piece. When the rotating shaft rotates to the full-closed position of the corresponding switch type valve in the second hour hand direction, the second positioning part abuts against the second blocking piece, and the switch type valve is kept in the closed state. According to the electric valve actuator, the requirement for full-opening and full-closing control of a switch type valve can be met, meanwhile, a worm gear and a worm which are high in manufacturing cost are omitted, the manufacturing cost is reduced, in addition, due to the transmission mode of the gear set, transmission resistance and abrasion are small, and the overall service life of the electric valve actuator can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valve control, in particular to an electric valve actuator. Background Art

[0002] An electric valve actuator is a control mechanism that uses electrical energy as its main energy source and is used to drive the valve to open and close. Existing electric valve actuators mainly include a housing and an actuator disposed in the housing. The actuator generally includes a base, a motor mounted on the base, a transmission mechanism, a control circuit board, and a rotating shaft. The motor forms a transmission connection with the rotating shaft through the transmission mechanism, so that the motor drives the rotating shaft to rotate through the transmission mechanism so that the rotating shaft drives the pivot shaft of the valve to drive the valve core to rotate, thereby controlling the opening and closing of the valve.

[0003] In order to prevent the rotating shaft from malfunctioning, the transmission mechanism of the existing electric valve actuator adopts a two-stage transmission mechanism of a gear set combined with a worm gear, wherein the gear set transmits the power of the motor to the worm gear, and the worm gear then transmits the power to the worm wheel arranged on the rotating shaft, so that the worm wheel drives the rotating shaft to rotate, and due to the self-locking characteristics of the worm gear, the pivot shaft of the valve can be prevented from malfunctioning under the pressure of the fluid to drive the rotating shaft, so that the valve can be kept at a predetermined opening position. For regulating valves, the two-stage transmission mechanism of a gear set combined with a worm gear is necessary and has good performance. However, for switch valves, it only has two working states: fully open (referred to as fully open) and fully closed (referred to as fully closed), and does not need to control different opening and closing degrees. Therefore, the use of a two-stage transmission mechanism of a gear set combined with a worm gear will result in a high cost of the electric valve actuator, and the worm gear also has the disadvantages of large transmission resistance and easy wear, and a short service life. Utility Model Content

[0004] The main purpose of the utility model is to provide an electric valve actuator, aiming to increase the service life and reduce the manufacturing cost.

[0005] To achieve the above-mentioned purpose, the utility model proposes an electric valve actuator, including a shell and an actuator installed inside the shell, the actuator including a base and a motor, a gear set and a rotating shaft arranged on the base, the gear set is used to transmit the power of the motor to the rotating shaft, a first positioning portion and a second positioning portion are circumferentially spaced on the rotating shaft, the shell is provided with a first stopper matched with the first positioning portion and a second stopper matched with the second positioning portion, when the rotating shaft rotates along the first clockwise direction to the fully open position of the corresponding valve, the first positioning portion is against the first stopper; when the rotating shaft rotates along the second clockwise direction to the fully closed position of the corresponding valve, the second positioning portion and the second stopper are against each other.

[0006] The technical solution of the utility model adopts a gear set as a transmission mechanism, and a first positioning part and a second positioning part are provided circumferentially on the rotating shaft, and a first stopper matched with the first positioning part and a second stopper matched with the second positioning part are provided on the housing. When the rotating shaft rotates along the first clockwise direction to the fully open position of the corresponding switch type valve, the first positioning part and the first stopper abut against each other, so that the direction of the valve core of the switch type valve and the fluid flowing through the switch type valve remain basically parallel; when the rotating shaft rotates along the second clockwise direction to the fully closed position of the corresponding switch type valve, the second positioning part and the second stopper abut against each other, preventing the fluid from pushing the valve core to swing along the second clockwise direction to the open position, so that the switch type valve remains in a closed state. The utility model electric valve actuator can omit the relatively expensive worm gear while meeting the full opening and full closing control requirements of the switch type valve, thereby reducing the manufacturing cost. In addition, due to the transmission mode of the gear set, its transmission resistance and wear are small, which can increase the overall service life of the electric valve actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a three-dimensional schematic diagram of the first angle of the utility model;

[0008] Figure 2 It is a three-dimensional schematic diagram of the utility model from a second angle;

[0009] Figure 3 A three-dimensional schematic diagram of the utility model from the third angle

[0010] Figure 4 It is an exploded schematic diagram of the utility model from one angle;

[0011] Figure 5 It is a schematic diagram of an exploded view of the utility model from another angle. DETAILED DESCRIPTION

[0012] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0013] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0014] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the utility model, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0015] The utility model provides an electric valve actuator.

[0016] In the embodiment of the utility model, Figures 1 to 5 As shown, the electric valve actuator includes a shell 1 and an actuator installed inside the shell, the actuator includes a base 2 and a motor 3, a gear set 5 and a rotating shaft 4 arranged on the base, the gear set 5 is used to transmit the power of the motor 3 to the rotating shaft 4, the rotating shaft 4 is circumferentially provided with a first positioning portion 4A and a second positioning portion 4B, the shell 1 is provided with a first stopper 1A matched with the first positioning portion 4A and a second stopper 1B matched with the second positioning portion 4B, when the rotating shaft 4 is rotated along a first clockwise direction (such as clockwise or counterclockwise) to the fully open position of the corresponding valve, the first positioning portion 4A is abutted against the first stopper 1A, so that the direction of the valve core of the switch type valve remains basically parallel to the fluid flowing through the switch type valve, thereby keeping the switch type valve in a fully open state. When the rotating shaft 4 rotates to the fully closed position of the corresponding valve along the second clockwise direction (such as counterclockwise or clockwise), the second positioning portion 4B and the second stopper 1B abut against each other to prevent the fluid from pushing the valve core to swing to the open position along the second clockwise direction, so that the switch type valve remains in a closed state. The electric valve actuator of the utility model can omit the relatively expensive worm gear while meeting the full opening and full closing control requirements of the switch type valve, thereby reducing the manufacturing cost. In addition, due to the transmission mode of the gear set, its transmission resistance and wear are small, which can increase the overall service life of the electric valve actuator.

[0017] Specifically, the rotating shaft 4 can be pivotally mounted on the base 2, and the end of the rotating shaft 4 is exposed on the bottom surface of the housing 1 to facilitate connection with the pivot shaft of the valve (not shown). When the output shaft of the motor 3 rotates, the rotating shaft 4 can be driven by the gear set 5 to drive the pivot shaft of the valve to rotate, thereby controlling the opening and closing of the valve.

[0018] In the embodiment of the utility model, the bottom surface of the shell 1 is provided with a step 10 which encloses the lower end of the rotating shaft 4, and the first positioning portion 4A and the second positioning portion 4B extend from the lower end of the rotating shaft 4 and are enclosed in the step, and the first stopper 1A and the second stopper 1B extend into the step 10 and respectively cooperate with the corresponding first positioning portion 4A and the second positioning portion 4B.

[0019] Specifically, a ring body 4C is sleeved and fixed on the lower end of the rotating shaft 4, and the first positioning portion 4A and the second positioning portion 4B extend from the peripheral wall of the ring body 4C. Specifically, the ring body 4C can be fixed to the rotating shaft 4 by a snap-fit ​​structure or a pin.

[0020] Generally speaking, the angle at which the rotating shaft 4 rotates from the fully open position of the corresponding valve to the fully closed position is 90 degrees. Therefore, the angle between the first positioning portion 4A and the second positioning portion 4B generally needs to be set to be greater than 90 degrees. In a preferred embodiment of the utility model, the angle between the first positioning portion 4A and the second positioning portion 4B is 180 degrees, and the first stopper 1A and the second stopper 1B are located between the first positioning portion 4A and the second positioning portion 4B. The size of the first stopper 1A and the second stopper 1B and the interval between them are based on the ability to limit the rotating shaft 4 from swinging between the fully open and fully closed positions of the corresponding valve.

[0021] In the embodiment of the utility model, the side of the shell 1 is provided with a first mounting hole 101 and a second mounting hole 102 connected to the step 10, and the first stopper 1A is installed in the first mounting hole 101 and partially extends into the step 10. The second stopper 1B is installed in the second mounting hole 102 and partially extends into the step 10. Specifically, the first stopper 1A and the second stopper 1B are respectively embedded in the corresponding first mounting hole 101 and the second mounting hole 102 by interference fit, or are respectively screwed into the corresponding first mounting hole 101 and the second mounting hole 102 by thread fit. Specifically, the first stopper 1A and the second stopper 1B are respectively formed with external threads, and the first mounting hole 101 and the second mounting hole 102 are respectively formed with internal threads that match the external threads. The thread fit method is adopted to facilitate the adjustment of the depth of the first stopper 1A and the second stopper 1B extending into the step, so as to ensure that the rotating shaft 4 can rotate between the fully open and fully closed positions of the corresponding valve.

[0022] It can be understood that the structure of the base 2 has many embodiments, such as a frame-like or plate-like structure. In one embodiment of the present utility model, Figure 4 , Figure 5 As shown, the base 2 is plate-shaped, and a support platform 121 is formed inside the housing 1. The base 2 is placed on the support platform 121 and is fixedly connected to the support platform 121, specifically, it can be detachably connected by a snap-fit ​​structure or screws. The base 2 can be made of high-strength aluminum alloy, stainless steel and other materials.

[0023] It can be understood that the gear set 5 includes a plurality of gears 50 meshing with each other, the bottom surface of the base 2 is formed with a plurality of first pivot grooves (not shown) for pivoting one end of the axle of the gear 50, and the inner wall of the housing 1 is formed with a plurality of second pivot grooves 122 for pivoting the other end of the axle of the gear 50, so that each gear 50 can rotate under the drive of the output shaft. Further, in order to ensure smooth rotation of the gear and reduce the wear of the axle of the gear 50, bearings (not shown) can be installed at both ends of the axle of the gear, and each bearing is installed in the corresponding first pivot groove and second pivot groove 122.

[0024] The housing 1 is provided with a through hole 15 above one of the gears of the gear set 5. The axle 51 of the gear 50 passes upward through the base 2 and extends to approach or extend out of the through hole 15. The top of the axle 51 is provided with a control part 52. The control part can be a non-circular countersunk hole (such as a square countersunk hole or a hexagonal countersunk hole, etc.) provided on the top surface of the axle 51, or a handle provided on the top of the axle 51 (not shown when the pivot shaft extends out of the housing), so that the user can drive the axle 51 to rotate the gear by tools (such as a hexagonal wrench or a square wrench, etc., not shown) or by hand, so that the rotating shaft 4 can be manually driven to rotate in the case of power failure or motor 3 failure to control the opening and closing of the valve. It can be understood that a sealing structure is provided between the axle 51 and the through hole 15 to prevent water or dust from entering the interior of the housing.

[0025] In the embodiment of the utility model, the top surface of the base 2 is installed with upper and lower micro switches 61 and 62, the rotating shaft 4 has an extension portion 41 extending upward from the base 2, and the extension portion 41 is provided with two upper cams 71 and lower cams 72 respectively matched with the upper and lower micro switches 61 and 62. When the valve needs to be opened, the control system (such as the control circuit) drives the motor 3 to rotate according to the instruction, and when the motor 3 drives the rotating shaft 4 to rotate to the position of opening the valve, the upper cam 71 rotates with the rotating shaft 4 to the position of triggering the upper micro switch 61. At this time, the control system controls the motor to stop rotating according to the signal fed back by the upper micro switch 61 to realize the opening operation of the valve, and at the same time, the first positioning portion 4A is against the first stopper 1A. When the valve needs to be closed, the control system (such as the control circuit) drives the motor 3 to rotate according to the instruction. When the motor 3 drives the rotating shaft 4 to rotate to the position of closing the valve, the lower cam 72 rotates with the rotating shaft 4 to the position of triggering the lower micro switch 62. At this time, the control system controls the motor to stop rotating according to the signal fed back by the lower micro switch 62, thereby realizing the closing operation of the valve. At the same time, the second positioning portion 4B is against the second stopper 1B.

[0026] In the embodiment of the utility model, the upper cam 71 and the lower cam 72 can be an integral structure formed in one piece, or can be two independent split structures, and the upper cam 71 and the lower cam 72 are fixed to the extension portion 41. The split structure is preferred.

[0027] Specifically, the free end of the swing arm of the upper micro switch 61 can be pivotally provided with a first roller 63, and the free end of the swing arm of the lower micro switch 62 can be pivotally provided with a second roller 64. When the upper cam 71 or the lower cam 72 swings with the rotation of the extension part 41, the end of the upper cam 71 or the lower cam 72 away from the extension part 41 can achieve rolling cooperation with the wheel surface of the first roller 63 or the second roller 64 to force the swing arm to press the button of the upper micro switch 61 or the lower micro switch 62.

[0028] Specifically, the two micro switches 61 and 62 are stacked and arranged on the top surface of the substrate.

[0029] Specifically, the housing 11 includes an upper shell 11 and a lower shell 12, which are butt-jointed and connected by fastening screws (not shown) or a snap-fit ​​structure (not shown) to enclose a space for accommodating the actuator.

[0030] Specifically, a cap body 42 with an open mark and a closed mark is fixedly provided on the upper end of the extension portion 41, and the cap body 42 can rotate with the extension portion 41. The shell 1 is provided with a transparent or partially transparent cover body 13 at a position corresponding to the cap body 42. The working status of the electric valve actuator can be obtained by observing the marked position of the cap body 42 through the transparent area of ​​the cover body 13.

[0031] Furthermore, a sealing structure (not shown) is provided at the joint of the rotating shaft 4 and the housing 11 to prevent dust or liquid from entering the housing 1. Specifically, the sealing structure is a sealing ring (not shown), and a groove is provided on the peripheral wall of the rotating shaft 4 and the sealing ring (not shown) is installed.

[0032] It can be understood that the utility model electric valve actuator can also include components such as a control circuit (not shown) and a wiring terminal 8 arranged on the base 2. The control circuit is used to connect the external circuit and the motor 3 and the upper and lower micro switches 61, 62 inside the housing 1. The wiring terminal 8 is used to transfer the conductive wire. As for how to connect, it belongs to the existing technology and will not be repeated here. Of course, the control circuit can also be arranged in an external control system.

[0033] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. An electric valve actuator, comprising a housing and an actuator installed inside the housing, wherein the actuator comprises a base and a motor, a gear set and a rotating shaft arranged on the base, characterized in that: The gear set is used to transmit the power of the motor to the rotating shaft. A first positioning portion and a second positioning portion are circumferentially spaced apart on the rotating shaft. The shell is provided with a first stopper that cooperates with the first positioning portion and a second stopper that cooperates with the second positioning portion. When the rotating shaft rotates along the first clockwise direction to the fully open position of the corresponding valve, the first positioning portion abuts against the first stopper; when the rotating shaft rotates along the second clockwise direction to the fully closed position of the corresponding valve, the second positioning portion and the second stopper abut against each other.

2. The electric valve actuator according to claim 1, characterized in that: The bottom surface of the shell is provided with a step enclosing the lower end of the rotating shaft, the first positioning portion and the second positioning portion extend from the lower end of the rotating shaft and are enclosed in the step, and the first stopper and the second stopper extend into the step.

3. The electric valve actuator according to claim 2, characterized in that: A ring body is sleeved and fixed on the lower end of the rotating shaft, and the first positioning portion and the second positioning portion extend from the peripheral wall of the ring body.

4. The electric valve actuator according to claim 1, characterized in that: A first mounting hole and a second mounting hole communicating with the step are provided on the side of the shell, the first stopper is installed in the first mounting hole and partially extends into the step, and the second stopper is installed in the second mounting hole and partially extends into the step.

5. The electric valve actuator according to claim 4, characterized in that: The first stopper and the second stopper are respectively screwed into the corresponding first mounting hole and the second mounting hole through threaded cooperation.

6. The electric valve actuator according to claim 1, characterized in that: The base is in the shape of a plate, a support platform is formed inside the shell, the base is placed on the support platform, and is fixedly connected to the support platform.

7. The electric valve actuator according to claim 1, characterized in that: The gear set includes a plurality of gears meshing with each other. The bottom surface of the base is formed with a plurality of first pivot grooves for pivotally connecting one end of the gear axle. The inner wall of the shell is formed with a plurality of second pivot grooves for pivotally connecting the other end of the gear axle. Bearings are respectively installed at both ends of the gear axle.

8. The electric valve actuator according to claim 1, characterized in that: The shell is provided with a through hole above one of the gears in the gear set. The axle of the gear passes upward through the base and extends to approach or extend out of the through hole. A control part is provided on the top of the axle. The control part is a non-circular countersunk hole provided on the top surface of the axle, or a handle provided on the top of the axle.

9. The electric valve actuator according to claim 1, characterized in that: The top surface of the base is provided with upper and lower micro switches, the rotating shaft has an extension portion extending upward from the base, and the extension portion is provided with an upper cam and a lower cam respectively matched with the upper and lower micro switches.

10. The electric valve actuator according to claim 9, characterized in that: The free end of the swing arm of the upper micro switch can be pivotally provided with a first roller, and the free end of the swing arm of the lower micro switch can be pivotally provided with a second roller. When the upper cam or the lower cam swings with the rotation of the extension part, the end of the upper cam or the lower cam away from the extension part can achieve rolling cooperation with the wheel surface of the first roller or the second roller to force the swing arm to press the button of the upper micro switch or the lower micro switch.

Images