Rotary actuator

Abstract

The utility model relates to the field of valve actuators, in particular to a rotary actuator which comprises a box body, an output motor, an output shaft, an output piece and an overload protection assembly, the output shaft and the output piece are sequentially arranged in the box body, the output piece is elastically connected with the output shaft through the overload protection assembly, the output piece and the output shaft are coaxially arranged, and an abutting groove is formed in the output shaft. The overload protection assembly comprises a mounting frame, an abutting block arranged on the mounting frame in a telescopic mode and a telescopic spring arranged on the mounting frame, the abutting block is arranged in the abutting groove in a sliding mode through the telescopic spring, and the abutting block abuts against the inner wall of the output piece. The abutting block can move towards the center shaft of the output shaft through the telescopic spring, and then the output piece is separated from the output shaft, so that when overload occurs, torque transmission between the rotary valve actuator and a valve is rapidly relieved, the output piece is not prone to continuously driving the valve to rotate due to inertia, and overload protection is better achieved.

Description

Technical Field

[0001] The utility model relates to the field of valve actuators, in particular to a rotary actuator. Background Art

[0002] The rotary valve actuator is used to output circular motion to drive the rotary valve to open or close. The rotary valve actuator usually includes a motor and an output part, and the output part is connected to the valve. When the rotary valve actuator is running, the motor drives the output part to rotate and outputs torque to the valve through the output part. When the rotary valve actuator is overloaded, that is, the torque value output by the valve actuator exceeds the rated torque, it is easy to cause the valve stem to bend and the valve body to be damaged. Therefore, it is necessary to set overload protection for the rotary valve actuator.

[0003] The existing rotary valve actuator relies on the overload protection circuit of the motor to achieve the overload protection function of the rotary valve actuator. The overload protection of the motor is achieved by generating heat through the current in the motor running circuit. When the motor is overloaded, the power increases, the heat generated by the current exceeds the rated value, and the hot metal sheet in the thermal relay heats up and deforms, thereby causing the normally closed contacts of the thermal relay to cut off the control circuit. However, the overload protection of the motor is relied upon to cut off the operation of the motor to achieve the overload protection of the rotary valve actuator. After the motor stops running, due to inertia, the output member located at the output end of the rotary valve actuator cannot immediately respond and stop outputting torque, and will continue to rotate, thereby continuing to drive the valve fixed relatively to the output member to rotate, which will still damage the valve. Utility Model Content

[0004] Based on the technical problems existing in the above-mentioned prior art, the utility model provides a rotary actuator, which can quickly release the torque transmission between the rotary valve actuator and the valve, so as to better achieve overload protection.

[0005] The technical solution adopted by the utility model to solve its technical problems is: to provide a rotary actuator, comprising a housing, an output motor arranged on the housing, an output shaft and an output member arranged in sequence in the housing, and an overload protection component arranged in the housing, wherein the output motor is used to drive the output shaft to rotate, the output member is elastically connected to the output shaft through the overload protection component, and the output member and the output shaft are coaxially arranged, a supporting groove is provided on the output shaft, the overload protection component comprises a mounting frame arranged on the inner wall of the output shaft, a supporting block telescopically arranged on the mounting frame, and a telescopic spring arranged on the mounting frame, the supporting block is slidably arranged in the supporting groove through the telescopic spring, and the supporting block is supported by the inner wall of the output member, and when the torque on the output shaft is overloaded, the supporting block can be moved toward the central axis of the output shaft through the telescopic spring, thereby causing the output member to be separated from the output shaft.

[0006] Furthermore, the mounting frame is provided with a sliding groove, the sliding groove is matched with the supporting block, one end of the telescopic spring is connected to the sliding groove, and the other end of the telescopic spring is connected to the supporting block.

[0007] Furthermore, the supporting block is provided with a limiting block, the sliding groove is provided with a limiting groove matched with the limiting block, and the limiting block is slidably arranged in the limiting groove.

[0008] Furthermore, the abutment block is arranged along the radial direction of the output shaft.

[0009] Furthermore, the abutting groove is arranged along the circumference of the inner wall of the output shaft.

[0010] Furthermore, a supporting protrusion is convexly provided on the outer wall of the output member, and a supporting groove matched with the supporting protrusion is formed on the box body, and the supporting protrusion and the groove wall of the supporting groove are mutually supported.

[0011] Furthermore, the inner wall of the output member is provided with a mounting protrusion matched with the abutting block, and the abutting block and the mounting protrusion abut against each other.

[0012] Furthermore, the mounting protrusion is a circular ring structure.

[0013] The beneficial effects of the utility model are as follows: a rotary actuator is provided, comprising a housing, an output motor arranged on the housing, an output shaft and an output member arranged in sequence in the housing, and an overload protection assembly arranged in the housing, wherein the output motor is used to drive the output shaft to rotate, the output member is elastically connected to the output shaft through the overload protection assembly, and the output member and the output shaft are coaxially arranged, a supporting groove is provided on the output shaft, the overload protection assembly comprises a mounting frame arranged on the inner wall of the output shaft, a supporting block telescopically arranged on the mounting frame, and a telescopic spring arranged on the mounting frame, the supporting block is slidably arranged in the supporting groove through the telescopic spring, and the supporting block is supported by the inner wall of the output member, when the torque on the output shaft is overloaded, the supporting block can move toward the central axis of the output shaft through the telescopic spring, thereby causing the output member to be separated from the output shaft, thereby realizing rapid release of the torque transmission between the rotary valve actuator and the driven member when overloaded, so that the output member is not easy to continue to drive the valve to rotate due to inertia, thereby better realizing overload protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] In the figure: Figure 1An overall structural diagram of a rotary actuator provided by the utility model;

[0016] Figure 2 for Figure 1 A partial structural diagram of a rotary actuator shown in ;

[0017] Figure 3 for Figure 2 Exploded diagram of

[0018] Figure 4 for Figure 2 A three-dimensional cross-sectional view of

[0019] Figure 5 for Figure 2 A cross-sectional view of a rotary actuator is shown;

[0020] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0021] Explanation of the reference numerals in the accompanying drawings: 100, rotary actuator; 10, housing; 11, supporting groove; 20, output motor; 30, output shaft; 31, supporting groove; 40, output member; 41, supporting protrusion; 42, mounting protrusion; 50, overload protection assembly; 51, mounting frame; 511, sliding groove; 5111, limiting groove; 52, supporting block; 521, limiting block; 53, telescopic spring; 60, base; 61, seal one; 62, seal two; 63, supporting member one; 64, supporting member two. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the utility model clearer, the utility model is now described in detail in conjunction with the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basics of the utility model in a schematic manner, so it only shows the structure related to the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] Please refer to Figure 1-6A rotary actuator 100 includes a housing 10, an output motor 20 disposed on the housing 10, an output shaft 30 and an output member 40 sequentially disposed in the housing 10, an overload protection assembly 50 disposed in the housing 10, and a base 60 abutting against the housing 10. The output motor 20 is used to drive the output shaft 30 to rotate. The output member 40 is elastically connected to the output shaft 30 through the overload protection assembly 50, and the output member 40 and the output shaft 30 are coaxially disposed. Specifically, the output motor 20 and the output shaft 30 are connected through a worm gear structure, which is not shown in the specific structure diagram. The output member 40 is a cylindrical structure, and the output member 40 is used to connect with a driven member (in this embodiment, the driven member is a valve) to drive the driven member to rotate by output torque.

[0024] The inner wall of the box body 10 is formed with a supporting groove 11 .

[0025] The output shaft 30 is provided with a plurality of abutment grooves 31 arranged about the circumference of the output shaft 30, and the abutment grooves 31 penetrate the side wall of the output shaft 30. Specifically, in this embodiment, two abutment grooves 31 are symmetrically arranged about the central axis of the output shaft 30, and the two abutment grooves 31 are arranged along the radial direction of the output shaft 30.

[0026] The outer wall of the output member 40 is provided with a supporting protrusion 41, which is matched with the supporting groove 11 on the box body 10. The supporting protrusion 41 is clamped in the supporting groove 11 and is mutually supported with the groove wall of the supporting groove 11, so as to prevent the output member 40 from being separated from the box body. The inner wall of the output member 40 is provided with a mounting protrusion 42. Specifically, the mounting protrusion 42 is a circular ring structure, and the mounting protrusion 42 and the inner wall of the output member 40 are integrally formed.

[0027] The overload protection assembly 50 includes a mounting frame 51 disposed on the inner wall of the output shaft 30 , a resisting block 52 telescopically disposed on the mounting frame 51 , and a telescopic spring 53 disposed on the mounting frame 51 .

[0028] Specifically, the mounting frame 51 is a cross structure, and the central axis of the mounting frame 51 coincides with the central axis of the output shaft 30 to ensure the coaxiality of the abutment block 52 and the output shaft 30. In some embodiments, the mounting frame 51 can be used for winding wiring.

[0029] The mounting frame 51 is provided with a sliding groove 511, which is matched with the abutting block 52. The groove wall of the sliding groove 511 is provided with a limiting groove 5111. One end of the abutting block 52 away from the center of the mounting frame 51 is slidably set in the abutting groove 31 on the output shaft 30. A limiting block 521 is provided on the side wall of the abutting block 52. The limiting block 521 is matched with the limiting groove 5111, and the limiting block 521 is slidably set in the limiting groove 5111. The abutting block 52 is slidably set in the abutting groove 31 through the telescopic spring 53, and one end of the abutting block 52 abuts against the mounting protrusion 42 on the inner wall of the output member 40. When the torque on the output shaft 30 is overloaded, the abutting block 52 can move toward the central axis of the output shaft 30 through the telescopic spring 53. Specifically, the abutting block 52 is set along the radial direction of the output shaft 30.

[0030] One end of the telescopic spring 53 is connected to the sliding groove 511 , and the other end of the telescopic spring 53 is connected to the abutting block 52 .

[0031] The base 60 is equipped with a seal 61, a seal 62, a support 63 and a support 64, wherein the seal 61, the seal 62 and the support 63 are all circular ring structures, and the support 64 is composed of two circular rings of different diameters. During assembly, the seal 61 and the side wall of the output shaft 30 and the inner wall of the base 60 are in contact with each other, the seal 62 and the side wall of the output member 40 and the inner wall of the base 60 are in contact with each other, the support 63 is located below the seal 62, the support 63 and the inner wall of the base 60 and the side wall of the output member 40 are in contact, and the support 64 is located below the output shaft 30.

[0032] When the torque on the output shaft 30 is normal, the end of the abutment block 52 away from the central axis of the output shaft 30 is maintained in a state of abutment against the inner wall of the output member 40 by the elastic force of the telescopic spring 53, so that the output member 40 and the output shaft 30 are coaxially fixed, so that the output shaft 30 can drive the output member 40 to rotate together.

[0033] When the torque on the output shaft 30 is overloaded, the circumferential force of the output shaft 30 is too large, so that the state of mutual abutment between the abutment block 52 and the inner wall of the output member 40 is released, and the output member 40 is separated from the output shaft 30. Therefore, when overloaded, the torque transmission between the rotary valve actuator and the valve can be quickly released, making it difficult for the output member 40 to continue to drive the valve to rotate due to inertia, thereby better realizing overload protection.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] It should be understood that the terms "length", "width", "up", "down", "front and back", "left and right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply 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 understood as a limitation on the present invention.

[0036] The above is based on the ideal embodiment of the utility model. Through the above description, relevant staff can make various changes and modifications without departing from the scope of the utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A rotary actuator, characterized in that: The invention comprises a housing (10), an output motor (20) arranged on the housing (10), an output shaft (30) and an output member (40) arranged in sequence in the housing (10), and an overload protection assembly (50) arranged in the housing (10), wherein the output motor (20) is used to drive the output shaft (30) to rotate, the output member (40) is elastically connected to the output shaft (30) through the overload protection assembly (50), and the output member (40) and the output shaft (30) are coaxially arranged, the output shaft (30) is provided with a supporting groove (31), and the overload protection assembly (50) comprises an arrangement A mounting frame (51) is provided on the inner wall of the output shaft (30), a supporting block (52) telescopically arranged on the mounting frame (51), and a telescopic spring (53) arranged on the mounting frame (51); the supporting block (52) is slidably arranged in the supporting groove (31) through the telescopic spring (53), and the supporting block (52) is supported against the inner wall of the output member (40); when the torque on the output shaft (30) is overloaded, the supporting block (52) can move toward the central axis of the output shaft (30) through the telescopic spring (53), thereby causing the output member (40) to separate from the output shaft (30).

2. The rotary actuator according to claim 1, characterized in that: The mounting frame (51) is provided with a sliding groove (511), the sliding groove (511) is adapted to the abutting block (52), one end of the telescopic spring (53) is connected to the sliding groove (511), and the other end of the telescopic spring (53) is connected to the abutting block (52).

3. The rotary actuator according to claim 2, characterized in that: The supporting block (52) is provided with a limiting block (521), the sliding groove (511) is provided with a limiting groove (5111) matched with the limiting block (521), and the limiting block (521) is slidably arranged in the limiting groove (5111).

4. The rotary actuator according to claim 1, characterized in that: The abutting block (52) is arranged along the radial direction of the output shaft (30).

5. The rotary actuator according to claim 1, characterized in that: The abutting groove (31) is arranged along the circumference of the inner wall of the output shaft (30).

6. The rotary actuator according to claim 1, characterized in that: The outer wall of the output member (40) is provided with a supporting protrusion (41), and the box body (10) is formed with a supporting groove (11) matched with the supporting protrusion (41), and the supporting protrusion (41) and the groove wall of the supporting groove (11) are mutually supported.

7. The rotary actuator according to claim 1, characterized in that: The inner wall of the output member (40) is provided with a mounting protrusion (42) matched with the abutting block (52), and the abutting block (52) and the mounting protrusion (42) abut against each other.

8. The rotary actuator according to claim 7, characterized in that: The mounting protrusion (42) is a circular ring structure.

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