Electric actuator for valve

Abstract

The utility model discloses an electric actuator for a valve, which belongs to the technical field of actuators and comprises an outer shell, a secondary speed reducer, a connecting component and a torque limiting component, the connecting component and the torque limiting component are arranged between the output end of the secondary speed reducer and the connecting end of the valve, and a clamping groove is arranged at the bottom of a torque limiting disc. The torsion limiting disc is matched with a clamping strip fixedly installed at the top of the connecting sleeve, the torsion limiting disc can abut against the connecting sleeve through downward thrust of the annular elastic piece on the torsion limiting assembly, at the moment, when the valve is normally opened and closed, the torsion limiting disc can drive the connecting sleeve to rotate through friction force, and power transmission is achieved; when the impact force generated by the water hammer effect is larger than the friction force between the torsion limiting disc and the connecting sleeve, the connecting sleeve can rotate along with the valve plate relative to the torsion limiting disc at the moment, so that an output bearing of the actuator can be prevented from being damaged due to overlarge alternating torque, and the service life of the actuator is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to actuator technical field more specifically, relate to a valve electric actuator. BACKGROUND

[0002] The valve electric actuator is a kind of automation device for driving valve opening, closing or adjusting, replaces manual operation by electric drive, is widely used in industrial pipeline system, provides power by motor (usually alternating current / direct current motor or step motor), then reduces speed by speed reduction mechanism, increases output torque, adapts to valve demand, by electric actuator, the remote automation control of valve can be realized, and the safety and efficiency of process industry are improved.

[0003] Chinese patent authorized announcement No.: CN221075421U provides a kind of valve actuator of being convenient for installation, the scheme is when hand-held valve actuator main body and pipe body contact alignment, pipe body is clamped into snap ring, while, positioning block is clamped into positioning slot, the connection between valve actuator main body and pipe body is positioned and guided, by being positioned and spliced simultaneously, push block is driven to move limit block to splicing block, spring is accompanied by compression shortening, when splicing block is connected with splicing slot, after force disappears, spring pushes limit block reverse movement, limit block is clamped into socket, the connection between valve actuator main body and pipe body is limited, avoid offset, provide convenience for subsequent reinforcing installation step.

[0004] When butterfly valve is quickly closed, the liquid flowing in pipeline is suddenly blocked due to inertia, its kinetic energy is forced to be converted into pressure energy, which causes the local pressure to rise sharply and forms water hammer effect, the water hammer force will directly impact the valve plate, the valve plate is instantaneously blocked or rebounds, so that the output shaft of the actuator bears alternating torque, which easily leads to gear tooth collapse or bearing damage, reducing the service life of the actuator.

[0005] Therefore, a valve electric actuator is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0006] 1. Technical problem to be solved

[0007] The utility model provides a kind of valve electric actuator, can improve the problems existing in relevant technologies: water hammer force will directly impact the valve plate, the valve plate is instantaneously blocked or rebounds, so that the output shaft of the actuator bears alternating torque, which easily leads to gear tooth collapse or bearing damage, reducing the service life of the actuator.

[0008] 2. Technical scheme

[0009] To solve the above problems, the utility model adopts the following technical scheme.

[0010] The embodiment of the application provides a valve electric actuator, which comprises an outer shell, a secondary speed reducer, a connecting assembly and a torque limiting assembly, a primary speed reducer is arranged on the top of the outer shell, the secondary speed reducer is arranged in the outer shell, the connecting assembly comprises a connecting sleeve, an abutting surface is arranged on the top of the connecting sleeve, a plurality of clamping strips are fixedly arranged on the surface of the abutting surface in a ring shape and at equal intervals, the torque limiting assembly comprises a torque limiting disc, a plurality of clamping grooves are arranged on the bottom of the torque limiting disc in a ring shape and at equal intervals, the clamping grooves are matched with the clamping strips, a ring-shaped elastic piece is arranged on the top of the torque limiting disc, and the clamping grooves are abutted with the clamping strips through the force of the ring-shaped elastic piece.

[0011] The technical scheme has at least the following technical effects:

[0012] The connecting assembly and the torque limiting assembly are arranged between the output end of the secondary speed reducer and the connecting end of the valve, the clamping grooves arranged on the bottom of the torque limiting disc are matched with the clamping strips fixedly arranged on the top of the connecting sleeve, the torque limiting disc and the connecting sleeve are abutted through the downward thrust of the ring-shaped elastic piece on the torque limiting assembly, at this time, the torque limiting disc can drive the connecting sleeve to rotate through the friction force when the valve is normally opened and closed, power transmission is realized, when the impact force generated by the water hammer effect is greater than the friction force between the torque limiting disc and the connecting sleeve, the connecting sleeve will rotate relative to the torque limiting disc at this time, so that the output shaft of the actuator can be prevented from being damaged by excessive alternating torque, and the service life of the actuator is improved.

[0013] In some embodiments, the input end of the primary speed reducer is connected with a motor, and the output end of the primary speed reducer is connected with the secondary speed reducer.

[0014] In some embodiments, an installation groove is arranged in the connecting sleeve, an installation assembly is arranged on the inner side of the installation groove, a connecting end head is fixedly connected to the bottom end of the connecting sleeve, and the connecting end head is used for being connected with the valve.

[0015] In some embodiments, the installation assembly comprises an installation column, a connecting head is fixedly connected to the bottom end of the installation column, the installation column is rotationally connected with the installation groove through the connecting head, a fixed end head is fixedly connected to the top end of the installation column, the fixed end head is fixedly connected with the output end of the secondary speed reducer, and the ring-shaped elastic piece is sleeved on the outer end of the installation column.

[0016] In some embodiments, an outer thread is arranged on the outer end of the installation column, a second pressure disc is threadedly connected to the installation column through the outer thread, a first pressure disc is sleeved on the outer end of the installation column, and a plurality of sliding grooves are arranged on the outer end of the installation column in a ring shape and at equal intervals.

[0017] In some embodiments, the top of the torsion limiting disk is provided with an abutment groove, the annular spring is installed inside the abutment groove, and an annularly distributed slider is fixedly installed inside the torsion limiting disk, the slider being slidably connected to the groove.

[0018] In some embodiments, the first pressure plate is located between the second pressure plate and the annular spring, the annular spring is located between the first pressure plate and the torsion limiting plate, the inner edge of the annular spring protrudes upward and abuts against the bottom of the first pressure plate, and the second pressure plate is threadedly connected to the mounting post so that the first pressure plate squeezes the annular spring. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the deceleration device structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the connection component structure of this utility model;

[0022] Figure 4 This is a schematic diagram of the assembly cross-sectional structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the torsion limiting component structure of this utility model;

[0024] Figure 6 This is a schematic diagram of the installation component structure of this utility model.

[0025] Explanation of the labels in the diagram:

[0026] 1. Outer shell;

[0027] 2. Single-stage reduction gear;

[0028] 3. Electric motor;

[0029] 4. Two-stage speed reduction device;

[0030] 5. Connecting component; 51. Connecting sleeve; 52. Abutting surface; 53. Retaining strip; 54. Mounting slot; 55. Connecting end;

[0031] 6. Mounting components; 61. Mounting post; 62. Slide groove; 63. External thread; 64. Fixed end; 65. Connector;

[0032] 7. Torque limiting component; 71. Torque limiting disc; 72. Slot; 73. Slider; 74. Abutment groove;

[0033] 8. Ring-shaped spring;

[0034] 9. Press plate one;

[0035] 10. Pressing plate two. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0037] Please see Figure 1 - Figure 6 An electric valve actuator includes: a housing 1, a secondary reduction gear 4, a connecting assembly 5, and a torque limiting assembly 7. The primary reduction gear 2 is installed on the top of the housing 1, and the secondary reduction gear 4 is disposed inside the housing 1. The connecting assembly 5 includes a connecting sleeve 51, and the top of the connecting sleeve 51 is provided with an abutment surface 52. An annularly distributed retaining strips 53 are fixedly installed on the surface of the abutment surface 52. The torque limiting assembly 7 includes a torque limiting disc 71, and the bottom end of the torque limiting disc 71 is provided with an annularly distributed retaining groove 72, which matches the retaining strips 53. An annular spring 8 is provided on the top of the torque limiting disc 71. The torque limiting disc 71 causes the retaining grooves 72 to abut against the retaining strips 53 through the force of the annular spring 8. The torque limiting disc 71 drives the connecting sleeve 51 to rotate through friction.

[0038] The input end of the first-stage speed reducer 2 is connected to the motor 3, and the output end of the first-stage speed reducer 2 is connected to the second-stage speed reducer 4.

[0039] The actuator in this design is primarily used to drive the butterfly valve to open and close. Compared to traditional electric actuators, the actuator in this design can limit torque. In case of overload, it will disconnect the power transmission between the butterfly valve and the actuator to prevent damage to the actuator. The housing 1 houses a two-stage reduction gear 4, which primarily reduces the power output from the motor 3. A first-stage reduction gear 2 connects the motor 3 and the second-stage reduction gear 4. Both the first-stage and second-stage reduction gears reduce the speed of the motor 3. However, the first-stage reduction gear 2 is mainly composed of a worm gear, providing both reduction and self-locking capabilities. The second-stage reduction gear 4, on the other hand, is mainly composed of a planetary gear set. The reduction ratio of the second-stage reduction gear 4 is greater than that of the first-stage reduction gear 2; therefore, their combination allows for a larger reduction ratio.

[0040] At the output end of the secondary reduction device 4, the mounting component 6 is connected. At the bottom of the mounting component 6, the connecting component 5 is set, and at the outer end, the torque limiting component 7 is set. The connecting component 5 is mainly used to connect with the valve to realize power transmission. The groove 72 at the bottom of the torque limiting disc 71 is adapted to the retaining strip 53 fixedly installed at the top of the connecting sleeve 51. By the downward pushing force of the annular spring 8 on the torque limiting component 7, the torque limiting disc 71 and the connecting sleeve 51 can be made to abut against each other. At this time, when the valve is opened and closed normally, the torque limiting disc 71 can drive the connecting sleeve 51 to rotate through friction, thus realizing power transmission. When the impact force generated by the water hammer effect is greater than the friction force between the torque limiting disc 71 and the connecting sleeve 51, the connecting sleeve 51 will rotate with the valve plate relative to the torque limiting disc 71. This can prevent the actuator output bearing from being damaged by excessive alternating torque and improve the service life of the actuator.

[0041] Please see Figure 3 and Figure 4 The connecting sleeve 51 has an installation groove 54 inside, and an installation component 6 is provided inside the installation groove 54. A connecting end 55 is fixedly connected to the bottom end of the connecting sleeve 51, and the connecting end 55 is used to connect to the valve.

[0042] In this design, the connecting component 5 is a valve connector. A connecting end 55 is fixed to the bottom of the connecting sleeve 51. The connecting end 55 has a groove inside, which is adapted to the valve stem on the valve and can be directly fitted onto the valve stem to complete the connection. An installation groove 54 is provided inside the connecting sleeve 51. The installation groove 54 is mainly used for connecting with the installation component 6. An abutment surface 52 is provided at the top of the connecting sleeve 51. Multiple ring-shaped and equidistant retaining strips 53 are fixed on the surface of the abutment surface 52. The retaining strips 53 protrude from the abutment surface 52 so that they can abut against the torque limiting component 7.

[0043] Please see Figure 6 The mounting component 6 includes a mounting post 61, with a connector 65 fixedly connected to the bottom end of the mounting post 61. The mounting post 61 is rotatably connected to the mounting groove 54 through the connector 65. A fixed end 64 is fixedly connected to the top end of the mounting post 61. The fixed end 64 is fixedly connected to the output end of the secondary reduction device 4. An annular spring 8 is sleeved on the outer end of the mounting post 61.

[0044] The outer end of the mounting post 61 is engraved with an external thread 63. The mounting post 61 is threadedly connected to a pressure plate 10 through the external thread 63. The outer end of the mounting post 61 is fitted with a pressure plate 9, and the outer end of the mounting post 61 is provided with annularly distributed sliding grooves 62.

[0045] The mounting component 6 in this design is mainly used to connect with the secondary reduction gear 4. A fixed end 64 is fixed to the top of the mounting column 61, and the fixed end 64 is fixedly connected to the output end of the secondary reduction gear 4, allowing the secondary reduction gear 4 to drive the mounting column 61 to rotate. A connector 65 is fixed to the bottom of the mounting column 61, and the connector 65 is rotatably connected to the mounting groove 54. The mounting column 61 can be rotatably mounted on the connecting sleeve 51 through the cooperation of the connector 65 and the mounting groove 54. An external thread 63 is engraved on the outer side of the mounting column 61, and the pressure plate 10 is threadedly connected to the external thread 63. The pressure plate 10 can be mounted on the outer end of the mounting column 61 through the external thread 63, and its position can be adjusted. Multiple annularly spaced sliding grooves 62 are also provided on the outer end of the mounting column 61. The sliding grooves 62 are mainly used to install the torque limiting component 7.

[0046] Please see Figure 5 The top of the limiting torsion plate 71 is provided with an abutment groove 74, and an annular spring piece 8 is installed inside the abutment groove 74. An annularly distributed slider 73 is fixedly installed inside the limiting torsion plate 71, and the slider 73 is slidably connected to the slide groove 62.

[0047] The torsion limiting component 7 in this scheme is mainly used to abut against the connecting component 5 to form a power transmission. A downwardly recessed abutment groove 74 is opened on the top of the torsion limiting disk 71, and an annular spring 8 is installed on the inner side of the abutment groove 74. Since the torsion limiting disk 71 is sleeved on the outer surface of the mounting post 61, the annular spring 8 is also sleeved on the outer end of the mounting post 61. At the bottom of the torsion limiting disk 71, multiple annularly distributed slots 72 are opened. The slots 72 match the retaining strips 53 on the connecting sleeve 51. When the bottom of the torsion limiting disk 71 abuts against the abutment surface 52, the retaining strips 53 will be inserted into the slots 72. Through the friction generated by the bottom of the torsion limiting disk 71 abutting against the abutment surface 52 and the retaining strips 53 being inserted into the slots 72, the torsion limiting disk 71 can drive the connecting sleeve 51 to rotate, thereby realizing the power transmission.

[0048] Multiple annularly distributed sliders 73 are fixed on the inner side of the torsion limiting disk 71. When the torsion limiting disk 71 is sleeved on the outer end of the mounting post 61, the sliders 73 will slide and connect with the slide groove 62. Therefore, the torsion limiting disk 71 can only slide up and down on the mounting post 61 and cannot rotate, so that the power of the secondary reduction device 4 can be transmitted to the torsion limiting disk 71 through the mounting post 61.

[0049] Please see Figure 3 - Figure 6The pressure plate 19 is located between the pressure plate 20 and the annular spring 8. The annular spring 8 is located between the pressure plate 19 and the torsion limiting plate 71. The inner edge of the annular spring 8 protrudes upward and abuts against the bottom of the pressure plate 19. The pressure plate 20 is threadedly connected to the mounting post 61, causing the pressure plate 19 to squeeze the annular spring 8.

[0050] In this design, the torsion limiting disc 71, the annular spring 8, the pressure plate 1 9, and the pressure plate 2 10 are sequentially fitted onto the outer end of the mounting post 61. The pressure plate 2 10 is located at the top and is threadedly connected to the mounting post 61. The annular spring 8 is located between the abutment groove 74 on the torsion limiting disc 71 and the pressure plate 1 9. The pressure plate 1 9 is located below the pressure plate 2 10. At the same time, the bottom of the pressure plate 1 9 has an annular groove, which is mainly used to allow the annular spring 8 to be embedded inside.

[0051] It is worth mentioning that the cross-section of the annular spring 8 is set as an isosceles trapezoid. That is to say, the edge of the central through hole of the annular spring 8 protrudes upward, making the edge of the central through hole higher than the outer edge of the annular spring 8. This allows the upward protruding part to bend downward when compressed, giving it a spring-like elasticity, but with a volume much smaller than a spring.

[0052] By moving the pressure plate 210 downward through the threaded connection between its outer end and the mounting column 61, the pressure plate 210 can drive the pressure plate 19 downward to press the inner edge of the annular spring 8. At this time, since the annular spring 8 is installed in the abutment groove 74 on the top of the torsion limiting plate 71, it will drive the torsion limiting plate 71 to slide downward, so that the torsion limiting plate 71 abuts against the abutment surface 52 of the connecting sleeve 51. Through the cooperation of the retaining strip 53 and the retaining groove 72, power can be transmitted through friction. When the butterfly valve is closed and encounters water hammer effect, the valve plate on the butterfly valve will be driven by the valve stem. As the connecting sleeve 51 rotates, if the generated torque is greater than the friction between the connecting sleeve 51 and the torque limiting disc 71, the retaining strip 53 will slide out of the retaining groove 72. Then, the annular spring 8 will be deformed by the pressure of the torque limiting component 7. Subsequently, it can be reset by the elastic force of the annular spring 8, and continue to push the torque limiting disc 71 towards the connecting sleeve 51, so that it can automatically reconnect through friction. This can prevent the actuator output bearing from being damaged by excessive alternating torque, thus playing a protective role and improving the service life of the actuator.

[0053] Working principle: When power transmission is performed, the slot 72 matches the retaining strip 53 on the connecting sleeve 51. When the bottom of the torque limiting disc 71 abuts against the contact surface 52, the retaining strip 53 will be inserted into the slot 72. Through the friction generated by the bottom of the torque limiting disc 71 abutting against the contact surface 52 and the retaining strip 53 being inserted into the slot 72, the torque limiting disc 71 can drive the connecting sleeve 51 to rotate, thereby realizing power transmission. When the butterfly valve is closed and encounters water hammer effect, if the generated torque is greater than the friction between the connecting sleeve 51 and the torque limiting disc 71, the retaining strip 53 will slide out of the slot 72. Then, through the elastic force of the annular spring 8, the torque limiting disc 71 can continue to be pushed back to the connecting sleeve 51 to reset, preventing the actuator output bearing from being damaged by excessive alternating torque.

Claims

1. A valve electric actuator, characterized in that, include: The outer casing (1) has a first-stage reduction gear (2) installed on its top. A two-stage reduction gear (4) is disposed inside the outer casing (1); The connecting component (5) includes a connecting sleeve (51), the top of the connecting sleeve (51) is provided with an abutting surface (52), and the surface of the abutting surface (52) is fixedly installed with ring-shaped and equally spaced clips (53); Torque limiting component (7), the torque limiting component (7) includes a torque limiting disk (71), the bottom end of the torque limiting disk (71) is provided with annularly distributed slots (72), the slots (72) are matched with the slot strip (53); The top of the torsion limiting disc (71) is provided with an annular spring (8). The torsion limiting disc (71) causes the slot (72) to abut against the strip (53) through the force of the annular spring (8). The torsion limiting disc (71) drives the connecting sleeve (51) to rotate through friction.

2. The valve electric actuator according to claim 1, characterized in that: The input end of the first-stage reduction device (2) is connected to a motor (3), and the output end of the first-stage reduction device (2) is connected to the second-stage reduction device (4).

3. The valve electric actuator according to claim 1, characterized in that: The connecting sleeve (51) has an installation groove (54) inside, and an installation component (6) is provided inside the installation groove (54). A connecting end (55) is fixedly connected to the bottom end of the connecting sleeve (51), and the connecting end (55) is used to connect to the valve.

4. A valve electric actuator according to claim 3, characterized in that: The mounting assembly (6) includes a mounting post (61), a connector (65) is fixedly connected to the bottom end of the mounting post (61), the mounting post (61) is rotatably connected to the mounting groove (54) through the connector (65), a fixed end (64) is fixedly connected to the top end of the mounting post (61), the fixed end (64) is fixedly connected to the output end of the secondary reduction device (4), and the annular spring (8) is sleeved on the outer end of the mounting post (61).

5. A valve electric actuator according to claim 4, characterized in that: The mounting post (61) has an external thread (63) engraved on its outer end. The mounting post (61) is threaded to a pressure plate (10) through the external thread (63). The mounting post (61) has a pressure plate (9) sleeved on its outer end. The mounting post (61) also has an annular groove (62) evenly distributed on its outer end.

6. A valve electric actuator according to claim 5, characterized in that: The top of the torsion limiting disk (71) is provided with an abutment groove (74), the annular spring piece (8) is installed inside the abutment groove (74), and annularly distributed sliders (73) are fixedly installed inside the torsion limiting disk (71), and the sliders (73) are slidably connected to the slide groove (62).

7. A valve electric actuator according to claim 6, characterized in that: The pressure plate one (9) is located between the pressure plate two (10) and the annular spring (8). The annular spring (8) is located between the pressure plate one (9) and the torsion limiting plate (71). The inner edge of the annular spring (8) protrudes upward and abuts against the bottom of the pressure plate one (9). The pressure plate two (10) is threadedly connected to the mounting post (61) so that the pressure plate one (9) squeezes the annular spring (8).

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