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 is provided with an installation groove, the output piece is provided with an installation through groove, the output piece is elastically connected with the output shaft through the overload protection assembly, and the output piece and the output shaft are coaxially arranged. The overload protection assembly comprises a mounting sleeve and a telescopic spring. When the torque output by the output shaft is normal, the installation sleeve abuts against the side wall of the installation through groove, and the output shaft and the output piece rotate synchronously. When the torque output by the output shaft is overloaded, the circumferential force of the output shaft is too large, so that the state that the mounting sleeve abuts against the groove wall of the mounting through groove is relieved, and the output piece is separated from the output shaft. Therefore, during overload, torque transmission between the rotary valve actuator and the valve can be quickly 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 driven part, so as to better achieve overload protection.

[0005] The utility model solves the technical problem by adopting the following technical solution: 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, a mounting groove is arranged on the peripheral side wall of the output shaft, the output member is provided with a mounting through groove, 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, the overload protection assembly comprises a mounting sleeve and a telescopic spring arranged in the mounting groove, the mounting sleeve is abutted against the groove wall of the mounting through groove, one end of the telescopic spring is connected to the bottom wall of the mounting groove, and the other end of the telescopic spring is connected to the inner wall of the mounting sleeve.

[0006] Furthermore, an abutting block abutting against the inner wall of the output member is provided at one axial end of the mounting sleeve.

[0007] Furthermore, the abutting block is a conical structure.

[0008] Furthermore, the telescopic spring includes a first spring and a second spring, the size of the first spring is larger than the size of the second spring, and the first spring is sleeved on the second spring.

[0009] Furthermore, the central axis of the mounting sleeve, the central axis of the telescopic spring, and the central axis of the output shaft are perpendicular to each other.

[0010] Furthermore, a groove wall of the installation groove is provided with a limiting groove, and a side wall of the installation sleeve is provided with a limiting block adapted to the limiting groove, and the limiting block is slidably arranged in the limiting groove.

[0011] Furthermore, the groove wall of the limiting groove is provided with a sliding groove, and the groove wall of the sliding groove is provided with a limiting clamping groove arranged along the radial direction of the output shaft, and the limiting block can slide along the sliding groove and the limiting clamping groove.

[0012] 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, a mounting groove is arranged on the peripheral side wall of the output shaft, the output member is provided with a mounting through groove, 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, the overload protection assembly comprises a mounting sleeve and a telescopic spring arranged in the mounting groove, the mounting sleeve is abutted against the groove wall of the mounting through groove, one end of the telescopic spring is connected to the bottom wall of the mounting groove, and the other end of the telescopic spring is connected to the inner wall of the mounting sleeve. When the torque output by the output shaft is normal, the mounting sleeve abuts against the side wall of the mounting slot, and the output shaft and the output member rotate synchronously; when the torque output by the output shaft is overloaded, the circumferential force of the output shaft is too large, so that the state of the mounting sleeve abutting against the slot wall of the mounting slot is released, so that the output member is separated from the output shaft. In this way, when overloaded, the torque transmission between the rotary valve actuator and the driven member can be quickly released, so that the output member is not likely to continue to drive the valve to rotate due to inertia, thereby better realizing overload protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0014] In the figure: Figure 1 An overall structural diagram of a rotary actuator provided by the utility model;

[0015] Figure 2 for Figure 1 A perspective view of a partial structure of a rotary actuator shown;

[0016] Figure 3 for Figure 2 An exploded view of a portion of the rotary actuator is shown;

[0017] Figure 4 for Figure 2 A partial structural sectional view of the rotary actuator shown;

[0018] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0019] Figure 6 for Figure 2 Stereoscopic cutaway view with some of the mechanisms hidden Figure 1 ;

[0020] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0021] Figure 8 for Figure 2 Stereoscopic cutaway view with some of the mechanisms hidden Figure 2 ;

[0022] Fig. 9 for Figure 8 Enlarged view of point C in the middle.

[0023] Explanation of the reference numerals in the accompanying drawings: 100, rotary actuator; 10, housing; 20, output motor; 30, output shaft; 31, mounting groove; 311, limit groove; 312, sliding groove; 313, limit slot; 40, output member; 41, mounting through groove; 50, overload protection assembly; 51, mounting sleeve; 511, support block; 512, limit block; 52, telescopic spring; 521, first spring; 522, second spring; 60, base; 61, seal one; 62, seal two; 63, support member one; 64, support member two. DETAILED DESCRIPTION

[0024] 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.

[0025] Please refer to Figure 1-9 A 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, and an overload protection assembly 50 disposed 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 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 to a driven member (in this embodiment, the driven member is a valve) to drive the driven member to rotate by output torque.

[0026] A mounting groove 31 is disposed on the peripheral side wall of the output shaft 30 . A limiting groove 311 is disposed on the groove wall of the mounting groove 31 . The limiting groove 311 is disposed along the radial direction of the output shaft 30 .

[0027] The output member 40 is provided with a mounting slot 41 . Specifically, the mounting slot 41 and the output member 40 are coaxially arranged.

[0028] The overload protection assembly 50 includes a mounting sleeve 51 and a telescopic spring 52 disposed in the mounting groove 31 . The mounting sleeve 51 abuts against the groove wall of the mounting through groove 41 . The central axis of the mounting sleeve 51 and the central axis of the telescopic spring 52 are perpendicular to the central axis of the output shaft 30 .

[0029] The groove wall of the limiting groove 311 is provided with an annular sliding groove 312 arranged along the peripheral side wall of the mounting sleeve 51, and the groove wall of the sliding groove 312 is provided with a limiting card groove 313. Specifically, the sliding groove 312 and the limiting groove 311 are perpendicular to each other, and the limiting card groove 313 is arranged along the radial direction of the output shaft 30.

[0030] An axial end of the mounting sleeve 51 is provided with a support block 511 that is supported against the inner wall of the output member 40. Specifically, the cross section of the support block 511 is a semicircular structure. The side wall of the mounting sleeve 51 is provided with a limit block 512 that is matched with the limit groove 311. The limit block 512 is slidably arranged in the limit slot 313. The limit block 512 and the limit groove 311, the sliding groove 312 and the limit slot 313 are all matched.

[0031] When the installation sleeve 51 is assembled, the limit block 512 enters the installation groove 31 along the limit groove 311, and slides along the circumferentially arranged sliding groove 312 to the position connected with the limit groove 313. When the output member 40 is sleeved on the outside of the output shaft 30, the installation sleeve 51 compresses the telescopic spring 52, and the limit block 512 slides inward along the limit groove 313, so that the output shaft 30 and the output member 40 are relatively fixed.

[0032] One end of the telescopic spring 52 abuts against the bottom wall of the mounting groove 31, and the other end of the telescopic spring 52 is connected to the inner wall of the mounting sleeve 51. Specifically, the telescopic spring 52 includes a first spring 521 and a second spring 522. The size of the first spring 521 is larger than that of the second spring 522. The first spring 521 is sleeved on the second spring 522, so that more telescopic springs 52 can be arranged in the same placement space, so as to bear more torque output by the output shaft 30.

[0033] 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.

[0034] When the torque output by the output shaft 30 is normal, the mounting sleeve 51 abuts against the side wall of the mounting slot 41, and the output shaft 30 and the output member 40 rotate synchronously; when the torque output by the output shaft 30 is overloaded, the circumferential force of the output shaft 30 is too large, so that the state of the mounting sleeve 51 abutting against the slot wall of the mounting slot 41 is released, so that the output member 40 is separated from the output shaft 30. In this way, when overloaded, the torque transmission between the rotary valve actuator and the valve can be quickly released, so that the output member 40 is not easy to continue to drive the valve to rotate due to inertia, thereby better realizing overload protection.

[0035] 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.

[0036] 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.

[0037] 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, a peripheral side wall of the output shaft (30) is provided with a mounting groove (31), the output member (40) is provided with a mounting through groove (41), and the output member (40) is connected to the housing (10) by the overload protection assembly ( The output member (40) is elastically connected to the output shaft (30), and the output member (40) and the output shaft (30) are coaxially arranged. The overload protection component (50) comprises a mounting sleeve (51) and a telescopic spring (52) arranged in the mounting groove (31). The mounting sleeve (51) abuts against the groove wall of the mounting through groove (41), one end of the telescopic spring (52) is connected to the bottom wall of the mounting groove (31), and the other end of the telescopic spring (52) is connected to the inner wall of the mounting sleeve (51).

2. The rotary actuator according to claim 1, characterized in that: An abutting block (511) abutting against the inner wall of the output member (40) is provided at one axial end of the installation sleeve (51).

3. The rotary actuator according to claim 1, characterized in that: The abutting block is a conical structure.

4. The rotary actuator according to claim 1, characterized in that: The telescopic spring (52) comprises a first spring (521) and a second spring (522); the size of the first spring (521) is larger than the size of the second spring (522); and the first spring (521) is sleeved on the second spring (522).

5. The rotary actuator according to claim 1, characterized in that: The central axis of the mounting sleeve (51), the central axis of the telescopic spring (52), and the central axis of the output shaft (30) are perpendicular to each other.

6. The rotary actuator according to claim 1, characterized in that: A groove wall of the installation groove (31) is provided with a limiting groove (311), and a side wall of the installation sleeve (51) is provided with a limiting block (512) adapted to the limiting groove (311), and the limiting block (512) is slidably arranged in the limiting groove (311).

7. The rotary actuator according to claim 6, characterized in that: The groove wall of the limiting groove (311) is provided with a sliding groove (312), the groove wall of the sliding groove (312) is provided with a limiting clamping groove (313) arranged radially along the output shaft (30), and the limiting block (512) can slide along the sliding groove (312) and the limiting clamping groove (313).

Images