A high-precision electric valve actuator

Abstract

The present invention discloses a high-precision electric valve actuator, which comprises a shell composed of a bottom shell and an upper cover and a motor arranged in the shell, wherein a valve connecting part is arranged on the shell, including a valve connecting head arranged on the bottom shell and an output shaft arranged in the valve connecting head, wherein the output shaft is cooperatively connected with the motor shaft of the motor; a circuit board is detachably mounted on the bottom shell; a switch swing arm is sleeved on the output shaft, including a sleeve and an extension arm arranged on the outer side surface of the sleeve; a micro switch is mounted on the circuit board and is respectively arranged on both sides of the switch swing arm; a switch button is arranged on the side of the micro switch, and the extension arm swings between the two micro switches with the rotation of the sleeve, and touches the switch button with the swing. In the present invention, the switch button on the micro switch is touched by the extension arm with the rotation of the sleeve, thereby realizing precise control of the electric valve, with high control sensitivity, and the precision requirements on the processing and installation process of each component of the actuator are greatly reduced by the extension arm.

Description

Technical Field

[0001] The present invention relates to the technical field of electric valve actuators, and particularly relates to a high-precision electric valve actuator. Background Art

[0002] The operating torque of an electric valve is larger than that of an ordinary valve. The opening and closing speeds of an electric valve can be adjusted. It has a simple structure and is easy to maintain, and can achieve precise control of the flow of various types of fluids such as air, water, and steam. With the rapid development of China's economy, as a type of automation instrument, the demand for electric valves has increased sharply in recent years. An electric valve consists of an electric actuator in the upper part and a valve in the lower part, and mainly drives the valve to open and close through the electric actuator to achieve automatic control of the valve.

[0003] For existing electric valve actuators, the control switch is often toggled by the protrusions on the switch parts. Generally, the control switches are arranged up and down. When the switch is toggled by the protrusion, due to the inability to guarantee the accuracy during the installation process, there are easily situations where the switch fails or the switch parts get stuck in rotation. Therefore, the switch of this kind of electric valve actuator is inconvenient to touch, and has too high requirements for installation accuracy, which is not conducive to use in production.

[0004] For this reason, Chinese Utility Model Patent CN210034593U provides an electric valve actuator, which includes a housing and two control switches and a rotatable switch part arranged in the housing. The two control switches are symmetrically arranged and at the same height, and the switch part has a fan-shaped structure that can touch these two control switches. This solution improves the stability of switch touch to a certain extent.

[0005] However, the above solution has the following disadvantages:

[0006] The start and stop of the control switch are realized by the rotation of the fan-shaped structure. The circular touch structure is not very sensitive when contacting the micro switch, and sometimes it is prone to failure, resulting in a short circuit in the circuit and safety issues; and the above solution has certain requirements for the processing accuracy of the housing and the installation accuracy of each component.

[0007] In view of this, it is urgent to improve the structure of the existing electric valve actuator to improve the sensitivity and touch safety of the electric valve actuator, and reduce the accuracy requirements for the installation process and processing process. Summary of the Invention

[0008] The technical problem to be solved by the present invention is the problems of low sensitivity, low control accuracy, easy to cause safety accidents, and high accuracy requirements for production processes and installation processes of existing electric valve actuators.

[0009] To solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0010] A high-precision electric valve actuator, comprising a housing composed of a bottom shell and an upper cover, and a motor disposed within the housing. The housing is provided with:

[0011] A valve connection portion, including a valve connection head disposed on the bottom shell and an output shaft disposed within the valve connection head. The output shaft is cooperatively connected to the motor shaft of the motor;

[0012] A circuit board, detachably mounted on the bottom shell;

[0013] A switch swing arm, sleeved on the output shaft, including a swing arm sleeve and an extension arm disposed on the outer side of the swing arm sleeve;

[0014] A micro switch, mounted on the circuit board, and respectively disposed on both sides of the switch swing arm; a switch button is provided on the side surface of the micro switch. The extension arm swings between the two micro switches as the swing arm sleeve rotates, and touches the switch button as it swings.

[0015] In the above solution, anti-over-swing limit posts are provided on the top surface of the bottom shell, disposed on both sides of the swing arm sleeve, and the anti-over-swing limit posts are disposed outside the swinging path of the extension arm.

[0016] In the above solution, preferably, multiple groups of limiting portions are provided on the bottom shell. Each group of limiting portions includes a motor fixing post and a circuit board limiting post. A threaded hole is provided on the top surface of the motor fixing post; the height of the circuit board limiting post is higher than the height of the motor fixing post. A limiting rib is provided on the side surface of the motor fixing post along its axial direction, and the height of the limiting rib is less than the height of the circuit board limiting post;

[0017] Fixing ears are provided on the motor, and screw holes and positioning holes adapted to the motor fixing post and the circuit board limiting post are provided on the fixing ears;

[0018] Limiting holes adapted to the motor fixing post and the circuit board limiting post are provided on the circuit board.

[0019] In the above solution, preferably, the circuit board limiting post is disposed on one side of the motor fixing post, and the circuit board limiting post and the motor fixing post are fixed by the limiting rib.

[0020] In the above solution, preferably, a switch fixing post is further provided on the bottom shell. Switch positioning holes are provided on the micro switch and the circuit board, and the switch fixing post penetrates through the switch positioning holes.

[0021] In the above solution, preferably, the valve connection head includes:

[0022] A valve sleeve, the upper end of the valve sleeve is fixed to the bottom surface of the bottom case by screws; the output shaft is rotatably arranged inside the valve sleeve;

[0023] A locking part, sleeved on the outer circumferential surface of the valve sleeve, for fastening the valve to the valve sleeve.

[0024] In the above solution, preferably, the housing further includes:

[0025] A lower cover plate, the lower cover plate is detachably installed on the bottom surface of the bottom case; a valve sleeve hole adapted to the valve sleeve is provided on the lower cover plate.

[0026] In the above solution, preferably, the upper cover, the bottom case and the lower cover plate are detachably connected by a snap structure, and the snap structure includes:

[0027] A first snap, arranged on the inner side surface of the upper cover; a slope is provided on the first snap and is inclined outward from top to bottom;

[0028] A first snap groove, arranged on the side surface of the bottom case, and is adapted to the first snap;

[0029] A second snap, arranged on the side surface of the lower cover plate; a slope is provided on the second snap and is inclined inward from bottom to top;

[0030] A second snap groove, adapted to the second snap, is arranged inside the first snap groove;

[0031] A third limiting rib, arranged below the first snap on the inner side surface of the upper cover;

[0032] A third slot, arranged below the second snap, and the third limiting rib is inserted into the third slot.

[0033] In the above solution, preferably, a fourth limiting rib is provided above the first snap, a fourth slot is provided on the bottom case, and the fourth limiting rib is adapted to the fourth slot and is inserted into the fourth slot.

[0034] In the above solution, preferably, a wire routing sleeve is provided on the bottom surface of the bottom case, and the wire routing sleeve is provided with a wire routing channel; a cable cap is provided at the lower end of the wire routing sleeve, and the cable cap is detachably installed on the wire routing sleeve by threads;

[0035] A wire routing sleeve hole adapted to the outer side surface size and shape of the wire routing sleeve is provided on the lower cover plate.

[0036] Compared with the prior art, the high-precision electric valve actuator provided by the present invention adopts the method of using an extension arm to touch the switch button, which greatly improves the sensitivity when the switch touch structure contacts the micro switch, and improves the reliability and safety of the operation of the electric valve actuator; by adopting the extension arm, the precision requirements for the installation process and the processing process are greatly reduced, the production and installation costs are reduced, and the installation efficiency is improved. Description of the Drawings

[0037] Figure 1 It is a perspective view of the high-precision electric valve actuator in the present invention;

[0038] Figure 2 It is an assembly schematic diagram of the high-precision electric valve actuator in the present invention;

[0039] Figure 3 It is a structural schematic diagram of the high-precision electric valve actuator in the present invention;

[0040] Figure 4 It is a structural schematic diagram of the lower cover plate in the present invention;

[0041] Figure 5 It is a structural schematic diagram of the upper cover in the present invention;

[0042] Figure 6 It is a structural schematic diagram of the bottom shell in the present invention.

[0043] Figure 7 It is an assembly schematic diagram of the circuit board and the micro switch in the present invention.

[0044] Among them, Figures 1 to 7 The corresponding relationship between the names of the components and the reference numerals in the drawings is as follows:

[0045] Motor 2, circuit board 4, switch swing arm 5, micro switch 6, upper cover 11, bottom shell 12, lower cover plate 13, first buckle 141, first buckle groove 142, second buckle 143, second buckle groove 144, third limiting rib 145, third slot 146, fourth limiting rib 147, fourth slot 148, motor fixing column 121, circuit board limiting column 122, threaded hole 123, limiting rib 1220, fixing ear 21, screw hole 211, positioning hole 212, limiting hole 41, valve connector 31, output shaft 32, valve sleeve 311, locking part 312, swing arm sleeve 51, extension arm 52, switch button 61, switch fixing column 124, switch positioning hole 62, switch pin 63, anti-over-swing limiting column 125, wire sleeve 126, cable cap 127, wire sleeve hole 131. Detailed Embodiments

[0046] The present invention provides a high-precision electric valve actuator. By means of a lengthening arm that touches a microswitch as it rotates with a sleeve, the reliability of the on-off control of the electric valve actuator is improved, the precision requirements for the machining and installation of internal parts of the actuator are reduced, and the production cost is lowered. A detailed description of the present invention will be given below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0047] As Figure 1 , Figure 2 and Figure 3 shown, the high-precision electric valve actuator provided by the present invention includes a housing and a motor 2, a valve connection part, a circuit board 4, a switch swing arm 5, and a microswitch 6 provided on the housing.

[0048] As Figure 4 , Figure 5 and Figure 6 shown, the housing includes an upper cover 11, a bottom shell 12, and a lower cover plate 13 provided on the bottom shell 11. The upper cover 11, the bottom shell 12, and the lower cover plate 13 are detachably connected by a snap structure. The snap structure includes a first snap 141, a first snap groove 142, a second snap 143, a second snap groove 144, a third limiting rib 145, and a third slot 146.

[0049] The first snap 141 and the third limiting rib 145 are provided on the inner side surface of the upper cover 11. The third limiting rib is provided below the first snap 141. The first snap 141 is provided with a slope that inclines outward from top to bottom. Both the first snap groove 143 and the second snap groove 144 are provided on the side surface of the bottom shell 12. The second snap groove 144 is provided at the lower end of the first snap groove 143. Both the second snap 143 and the third slot 146 are provided on the lower cover plate 13. The third slot 146 is provided below the second snap 143.

[0050] The first snap 141 cooperates with the first snap groove 142 to install the upper cover 11 on the bottom shell 12; the second snap 143 cooperates with the second snap groove 144 to install the lower cover plate 13 on the bottom shell 12; the third limiting rib 145 is inserted into the third slot 146 below the second snap 143. While connecting the upper cover 11 and the lower cover plate 13 together, the connection strength between the second snap 143 and the second snap groove 144 is improved, thereby improving the connection strength between the lower cover plate 13 and the bottom shell 12.

[0051] Above the first snap 141, there is a fourth limiting rib 147. On the bottom shell 12, there is a fourth slot 148. The fourth limiting rib 147 is adapted to the fourth slot 148 and is inserted into the fourth slot 148.

[0052] On the top surface of the bottom case 12, there are multiple groups of limiting parts for fixing the motor 2 and the circuit board 4. Each group of limiting parts includes a motor fixing post 121 and a circuit board limiting post 122. On the top surface of the motor fixing post 121, there is a threaded hole 123. The height of the circuit board limiting post 122 is higher than that of the motor fixing post 121. On the side surface of the circuit board limiting post 122, there is a limiting rib 1220 arranged along its axial direction, and the height of the limiting rib 1220 is less than that of the circuit board limiting post 122. The motor fixing post 121 is arranged on one side of the circuit board limiting post 122, and the circuit board limiting post 122 and the motor fixing post 121 are fixed by the limiting rib 210.

[0053] On the motor 2, there is a fixing ear 21. On the fixing ear 21, there are a screw hole 211 and a positioning hole 212 adapted to the motor fixing post 121 and the circuit board limiting post 122. The fixing ear 21 is sleeved on the circuit board limiting post 122 through the positioning hole 212, and is fixed to the motor fixing post 121 by a screw passing through the screw hole 211.

[0054] As Figure 7 shown, on the circuit board 4, there are limiting holes 41 adapted to the motor fixing post 121 and the circuit board limiting post 122 for restricting the circuit board 4 on the bottom case 12. The circuit board 4 is detachably installed on the bottom case 12 through the motor fixing post 121, the circuit board limiting post 12 and the limiting holes 41.

[0055] The valve connection part includes a valve connector 31 arranged on the bottom surface of the bottom case 12 and an output shaft 32 arranged inside the valve connector 31. The valve connector 31 includes a valve sleeve 311 and a locking part 312. The upper end of the valve sleeve 311 is fixed to the bottom surface of the bottom case 12 by a screw. The locking part 312 is sleeved on the outer circumferential surface of the valve sleeve 311 for fastening the valve to the valve sleeve 311. The output shaft 32 is rotatably arranged inside the valve sleeve 311. Its upper end is in mating connection with the motor shaft of the motor 2, and its lower end is connected to the valve stem of the valve, driving the valve to rotate through the valve stem.

[0056] The switch swing arm 5 includes a swing arm sleeve 51 sleeved on the output shaft 32 and an extension arm 52 arranged on the outer side surface of the swing arm sleeve 51. The micro switch 6 is installed on the circuit board 4 and is respectively arranged on both sides of the switch swing arm 5. On the side surface of the micro switch 6, there is a switch button 61. The extension arm 52 swings between the two micro switches 6 as the swing arm sleeve 51 rotates and touches the switch button 61 as it swings.

[0057] On the top surface of the bottom shell 12, there are switch fixing posts 124. On the micro switch 6 and the circuit board 4, there are switch positioning holes 62. The switch fixing posts 124 are inserted into the switch positioning holes 62 to limit the micro switch 6 on the bottom shell 12. The micro switch 6 is also provided with switch pins 63, and the circuit board 4 is provided with pin slots. The switch pins 63 are inserted into the pin slots to mount the micro switch 6 on the circuit board 4.

[0058] On the top surface of the bottom shell 12, there are anti-over-swing limit posts 125. The anti-over-swing limit posts 125 are arranged on both sides of the swing arm sleeve 51 and on the outer side of the swing path of the extension arm 52 to prevent the extension arm 52 from over-positioning and damaging the switch button 61.

[0059] On the bottom surface of the bottom shell 12, there is a wire routing sleeve 126 which is provided with a wire routing channel; at the lower end of the wire routing sleeve 126, there is a cable cap 127 which is detachably installed on the wire routing sleeve 126 by threads. On the lower cover 13, there is a wire routing sleeve hole 131 which is adapted to the size and shape of the outer side surface of the wire routing sleeve 126. The cable passes through the wire routing and is connected to the circuit board 4, and the wire routing sleeve 126 is sealed by the cable wire board 126.

[0060] The working process of the present invention is as follows:

[0061] Install the motor 2, the valve connecting part, the circuit board 4, the switch swing arm 5 and the micro switch 6 on the bottom shell 12, and assemble the upper cover 11, the bottom shell 12 and the lower cover 13 through a snap structure. Install the assembled high-precision electric valve actuator on the valve stem, supply power to the circuit board through the cable, drive the output shaft 32 to rotate through the motor 2, the output shaft 32 drives the valve stem to rotate, the switch swing arm 5 rotates with the output shaft 32, and the extension arm 52 touches the switch button 61 on the micro switch 6 to realize the automatic control of the electric valve.

[0062] The anti-over-swing limit posts 125 are arranged on the outer side of the swing path of the extension arm 52, which can prevent the motor 2 from rotating too much, resulting in the over-swing and over-positioning of the extension arm 52, damaging the switch button 61, causing the control switch to malfunction or even causing safety problems such as a short circuit in the circuit.

[0063] Compared with the circular or sector-shaped touch structures adopted in the prior art, the high-precision electric valve actuator provided by the present invention has the following advantages:

[0064] (1) The open valve switch and the close valve switch are respectively arranged on both sides of the extension swing arm. The extension swing arm can contact the open valve switch and the close valve switch to perform the opening and closing valve operations, improving the stability of the switch and the accuracy of the opening valve operation and the closing valve operation, reducing the accuracy requirements for the processing technology and installation technology of the electric valve actuator, and reducing the production and installation costs;

[0065] (2) A limit post is provided between the switch and the extended swing arm to prevent the extended swing arm from swinging excessively, continuing to rotate after contacting the switch, and damaging the microswitch, thereby avoiding circuit accidents.

[0066] (3) Adopting a modular design, the upper cover, bottom shell, and lower cover plate are detachably connected through a special snap structure, greatly improving the connection firmness between the components of the shell; the circuit board limit posts on the bottom shell penetrate through the circuit board and are snap-fitted on the bottom shell. The bottom shell and the upper cover are snap-fitted through the snap structure, eliminating the need to use components such as screws for fixation, achieving rapid assembly of the electric actuator, and greatly improving the assembly efficiency and maintenance efficiency of the high-precision electric valve actuator.

[0067] (4) By extending the swing arm, a lever effect is formed, and precise control can be achieved by increasing the distance of the extended swing arm and the stroke of the touch point on the extended swing arm. Moreover, as the length of the swing arm increases, the control accuracy becomes higher and higher.

[0068] The present invention is not limited to the above-mentioned best implementation mode. Anyone should know that structural changes made under the inspiration of the present invention, as long as they have the same or similar technical solutions as the present invention, fall within the protection scope of the present invention.

Claims

1. A high-precision electric valve actuator, comprising a housing composed of a bottom shell and an upper cover and a motor arranged in the housing, characterized in that: The housing is provided with: A valve connection part, comprising a valve connection head arranged on the bottom shell and an output shaft arranged in the valve connection head, wherein the output shaft is cooperatively connected with the motor shaft of the motor; A circuit board is detachably mounted on the bottom shell; A switch swing arm, sleeved on the output shaft, comprises a swing arm sleeve and an extension arm arranged on the outer side of the swing arm sleeve; A micro switch is mounted on the circuit board and is respectively arranged on both sides of the switch swing arm; a switch button is arranged on the side of the micro switch, and the extension arm swings between the two micro switches as the swing arm sleeve rotates, and touches the switch button as it swings; An over-swing prevention limit column is provided on the top surface of the bottom shell, which is arranged on both sides of the swing arm sleeve, and the over-swing prevention limit column is arranged outside the swing path of the extension arm; The valve connector comprises: A valve sleeve, the upper end of which is fixed to the bottom surface of the bottom shell by screws; the output shaft is rotatably arranged in the valve sleeve; A locking portion, sleeved on the outer circumferential surface of the valve sleeve, for fastening the valve to the valve sleeve; The housing further comprises: A lower cover plate, the lower cover plate is detachably mounted on the bottom surface of the bottom shell; the lower cover plate is provided with a valve sleeve hole adapted to the valve sleeve; The upper cover, the bottom shell and the lower cover plate are detachably connected via a buckle structure, and the buckle structure includes: A first buckle is arranged on the inner side of the upper cover; the first buckle is provided with a slope inclined downward from the top to the outside; A first buckle groove, arranged on the side of the bottom shell, adapted to fit the first buckle; A second buckle is arranged on the side of the lower cover plate; the second buckle is provided with a slope inclined upward and inward; A second buckle slot, adapted to the second buckle, and disposed in the first buckle slot; A third limiting ridge is arranged below the first buckle on the inner side surface of the upper cover; The third slot is arranged below the second buckle, and the third limiting ridge is inserted into the third slot.

2. The high-precision electric valve actuator according to claim 1, characterized in that: The bottom shell is provided with a plurality of groups of limiting parts, each group of the limiting parts includes a motor fixing column and a circuit board limiting column, and a threaded hole is provided on the top surface of the motor fixing column; the height of the circuit board limiting column is higher than the height of the motor fixing column, and the side surface of the motor fixing column is provided with a limiting edge arranged along the axial direction thereof, and the height of the limiting edge is less than the height of the circuit board limiting column; The motor is provided with a fixing ear, and the fixing ear is provided with a screw hole and a positioning hole adapted to the motor fixing column and the circuit board limiting column; The circuit board is provided with a limiting hole matched with the motor fixing column and the circuit board limiting column.

3. The high-precision electric valve actuator according to claim 2, characterized in that: The circuit board limiting column is arranged on one side of the motor fixing column, and the circuit board limiting column and the motor fixing column are fixed by the limiting edge.

4. The high-precision electric valve actuator according to claim 1, characterized in that: The bottom shell is also provided with a switch fixing column, the micro switch and the circuit board are provided with a switch positioning hole, and the switch fixing column is arranged through the switch positioning hole.

5. The high-precision electric valve actuator according to claim 1, characterized in that: A fourth limiting ridge is disposed above the first buckle, a fourth slot is disposed on the bottom shell, and the fourth limiting ridge is matched with the fourth slot and inserted into the fourth slot.

6. The high-precision electric valve actuator according to claim 1, characterized in that: A wiring sleeve is provided on the bottom surface of the bottom shell, and the wiring sleeve is provided with a wiring channel; a cable cap is provided at the lower end of the wiring sleeve, and the cable cap is detachably mounted on the wiring sleeve through threads; The lower cover plate is provided with a wiring sleeve hole which is matched with the size and shape of the outer side surface of the wiring sleeve.

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