CN117212532A

CN117212532A - Spring self-resetting electric actuating mechanism

Info

Publication number: CN117212532A
Application number: CN202311392141.8A
Authority: CN
Inventors: 周源; 林宇清; 罗伟涛; 邵杰; 顾春辉; 李建平; 叶剑云; 李虎; 刘进军; 张亮亮; 赵智颖; 张学东; 曹超
Original assignee: Changzhou Power Station Auxiliary Equipment Co ltd; Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Current assignee: Changzhou Power Station Auxiliary Equipment Co ltd; Shanghai Nuclear Engineering Research and Design Institute Co Ltd
Priority date: 2023-10-25
Filing date: 2023-10-25
Publication date: 2023-12-12

Abstract

The application provides a spring self-resetting electric actuating mechanism which comprises a shell, a motor and a gear assembly, wherein a matching shaft is arranged on the shell and penetrates through the shell, the end part of the matching shaft is used for installing a self-centering joint, and the self-centering joint is used for installing a valve rod; the motor is arranged on the shell and is provided with an output shaft; the gear assembly is arranged on the shell, one end of the gear assembly is meshed with the output shaft gear, the other end of the gear assembly is meshed with the matching shaft, and the motor is used for driving the gear assembly to drive the valve rod to rotate so as to switch the valve. The spring self-resetting electric actuating mechanism uses the motor as the locked rotor to brake the valve rod, does not need an electromagnetic brake, meets the installation requirements in the forward and reverse directions, enables the electric actuating mechanism to have the functions of resetting the valve opening and resetting the valve closing, adopts the self-centering joint, can accommodate valve rods with different sizes, and simultaneously keeps the valve rod concentric with the self-centering joint.

Description

Spring self-resetting electric actuating mechanism

Technical Field

The application relates to the technical field of valve control in an air conditioning system of a nuclear power plant, in particular to a spring self-resetting electric actuator.

Background

In the design of a ventilation air conditioning system of a nuclear power plant, a damper is generally used to realize the functions of adjusting the air quantity, isolating or preventing the air flow from flowing backwards. When a fire disaster occurs in a room, flames invade the air duct, the fireproof valve needs to be closed in time, the ventilation pipeline is cut off, the fire spreading is controlled, and the isolation of the fireproof subareas is realized. Thus, there is a need for an electric actuator that allows the valve to automatically reset under certain conditions, such as a loss of power.

The working principle of the current electric actuating mechanism is as follows: and after the power is turned on, the power supply of the motor is disconnected by utilizing a limit switch, and meanwhile, the electromagnetic brake is powered on to brake the output shaft, and after the power is lost, the electromagnetic brake is powered off, and the reset spring drives the output shaft to reset.

The existing electric actuating mechanism has the following defects:

1. the electric actuating mechanism needs to be provided with braking components such as an electromagnetic brake and a limit switch for transmitting control signals to the electromagnetic brake, so that the electric actuating mechanism is complex in structure, large in appearance and high in cost.

2. The mechanical and electrical structures of the electric actuating mechanism for resetting and developing are different from those of the electric actuating mechanism for resetting and closing the valve, namely, one electric actuating mechanism can only reset in one direction, for example, can only reset to open or reset to close, and cannot have the functions of resetting and opening the valve and resetting and closing the valve at the same time.

3. The electric actuating mechanism realizes the reset function by using the reset spring, so that the reset spring needs to be pre-tensioned, the reset spring with some structures is arranged on the output shaft, the output shaft and the transmission part with some structures are not detachable, the pre-tensioned of the reset spring is difficult, and special equipment can only be used for pre-tensioning the spring and then assembling the spring and the transmission part.

4. The structure for connecting the output shaft of the electric actuator and the valve rod of the valve is to adopt key connection or square head connection, which can keep the output shaft and the valve rod concentric, but the valve rods with different sizes need to customize the output shaft with corresponding sizes. Some are structures adopting hoop connection, which can accommodate valve rods of different sizes, but the concentricity of the output shaft and the valve rod is poor.

Based on the above, the present application provides a spring self-resetting electric actuator to solve the above technical problems.

Disclosure of Invention

The application aims to overcome the defects that an electric actuating mechanism in the prior art is complex in structure and difficult to implement single reset and reset functions, and provides a spring self-reset electric actuating mechanism.

The application solves the technical problems by the following technical proposal:

the application provides a spring self-resetting electric actuator, which is characterized by comprising:

the valve comprises a shell, a valve rod and a valve rod, wherein a matching shaft is arranged on the shell and penetrates through the shell, the end part of the matching shaft is used for installing a self-centering joint, and the self-centering joint is used for installing the valve rod;

the motor is arranged on the shell and is provided with an output shaft;

the gear assembly is arranged on the shell, one end of the gear assembly is meshed with the output shaft gear, the other end of the gear assembly is meshed with the matching shaft, and the motor is used for driving the gear assembly to drive the valve rod to rotate so as to switch the valve.

According to one embodiment of the application, the self-centering joint is detachably connected to the mating shaft;

the opposite ends of the matching shaft are the mounting ends of the valve rod.

According to one embodiment of the application, the self-centering joint comprises a bracket, a positioning ring, an inner claw and an outer claw, wherein the positioning ring is provided with at least one positioning pin, and the positioning ring is mounted on the matching shaft;

the inner claw and the outer claw are installed in the bracket through threaded connectors and are used for being close to each other to generate closed jaws in the bracket, the jaws and the positioning ring are coaxial, and the jaws are used for clamping the valve rod.

According to one embodiment of the application, the inner claw is provided with a first opening, the outer claw is provided with a second opening towards one side of the inner claw, and the first opening and the second opening are matched to form the jaw.

According to one embodiment of the application, the gear assembly comprises a first gear, a second gear and a third gear, wherein one end of the first gear is meshed with the output shaft, and the other end of the first gear is meshed with the second gear;

the gear assembly further comprises a reset mechanism, one end of the reset mechanism is meshed with the second gear, and the other end of the reset mechanism is meshed with the third gear;

the periphery of the matching shaft is provided with a sector gear, one end of the third gear is meshed with the sector gear, one side of the matching shaft is also provided with two adjusting screws arranged at intervals, one end of each adjusting screw faces towards two end faces of the sector gear, and the adjusting screws are used for limiting the rotating position of the sector gear.

According to one embodiment of the application, the reset mechanism comprises a manual shaft, a fourth gear is sleeved on the manual shaft, one end of the fourth gear is meshed with the second gear, and the other end of the fourth gear is meshed with the third gear.

According to one embodiment of the application, the reset mechanism further comprises a reset spring sleeved on the manual shaft and located above the fourth gear.

According to one embodiment of the application, the locking mechanism further comprises a locking shaft, a torsion spring sleeved on the locking shaft and a locking plate sleeved on the outer side of the torsion spring, wherein the locking plate has a first state and a second state under the rotation of the locking shaft;

in the first state, one end of the locking plate is clamped on the second gear to lock the position of the valve rod;

in the second state, the locking plate is disengaged from the second gear to be unlocked under rotation of the torsion spring.

According to one embodiment of the application, the end of the locking plate facing the second gear is tapered for insertion into the tooth gap between adjacent teeth of the second gear.

According to one embodiment of the application, a micro switch is further arranged in the shell, a travel cam is further sleeved outside the matching shaft, and the output end of the micro switch faces to the travel cam and is used for switching on and off the motor.

The application has the positive progress effects that:

the spring self-resetting electric actuating mechanism of the application has at least the following advantages:

1. the valve rod is braked by using the motor as the locked rotor performance, and an electromagnetic brake is not needed.

2. The electric actuator meets the mounting requirements in the forward and reverse directions, and has the functions of resetting and opening and resetting and closing the valve.

3. The reset spring adopts a detachable structure, is convenient to disassemble and assemble, and is simpler in pretension operation.

4. With the self-centering joint, valve stems of different sizes can be accommodated while maintaining concentricity of the valve stem with the self-centering joint.

Drawings

The above and other features, properties and advantages of the present application will become more apparent from the following description in conjunction with the accompanying drawings and embodiments, in which:

FIG. 1 is a schematic diagram of a spring self-resetting electric actuator of the present application;

FIG. 2 is a schematic view of the spring self-resetting electric actuator of FIG. 1 from another angle;

FIG. 3 is a schematic view of the internal structure of the spring self-resetting electric actuator of the present application;

FIG. 4 is a schematic illustration of the fit of the self-centering joint of the present application with a valve stem;

FIG. 5 is a schematic view of the explosive structure of the self-centering joint of the present application;

FIG. 6 is a schematic diagram of the mating transmission of the gear assembly and output shaft of the present application;

FIG. 7 is a schematic view of the angular mating structure of the gear assembly and locking mechanism of the present application;

FIG. 8 is a schematic view of another mating angle of the gear assembly and the locking mechanism of the present application.

10. A housing; 110. a self-centering joint; 111. a bracket; 112. a positioning ring; 113. an inner claw; 114. an outer claw; 115. a positioning pin; 116. a jaw; 117. a first opening; 118. a second opening; 119. a sector gear; 1190. an adjusting screw; 120. a valve stem; 130. a micro-switch; 140. a travel cam; 150. a mating shaft;

20. a motor; 210. an output shaft;

30. a gear assembly; 310. a first gear; 320. a second gear; 330. a third gear; 340. a reset mechanism; 341. a manual shaft; 342. a fourth gear; 343. a return spring;

40. a locking mechanism; 410. a locking shaft; 420. a torsion spring; 430. and a locking plate.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.

Embodiments of the present application will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to the preferred embodiments of the present application, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Furthermore, although terms used in the present application are selected from publicly known and commonly used terms, some terms mentioned in the present specification may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Furthermore, it is required that the present application is understood, not simply by the actual terms used but by the meaning of each term lying within.

Referring to fig. 1 to 8, the present application provides a spring self-resetting electric actuator, which includes a housing 10, a motor 20 and a gear assembly 30, wherein a mating shaft 150 is disposed on the housing 10, the mating shaft 150 is disposed through the housing 10, an end of the mating shaft 150 is used for mounting a self-centering joint 110, and the self-centering joint 110 is used for mounting a valve rod 120.

Specifically, the housing 10 has an interior cavity for receiving the motor 20 and gear assembly 30, and the housing 10 is provided with a mating shaft 150 for removably mounting the self-centering joint 110.

The motor 20 is provided on the housing 10 and has an output shaft 210. The motor 20 is disposed in the inner cavity of the housing 10, and is used for driving the valve rod 120 to rotate, thereby controlling the valve opening and closing.

The gear assembly 30 is disposed on the housing 10, and has one end geared with the output shaft 210 and the other end geared with the mating shaft 150, and the motor 20 is used to drive the gear assembly 30 to rotate the valve stem 120 to open and close the valve.

It should be noted that, the present application does not use a braking component such as an electromagnetic brake, and uses the motor 20 to realize valve opening and valve closing, which is beneficial to simplifying the electric actuator, meeting the design requirement of miniaturization of the electric actuator, and reducing the cost. Moreover, the motor 20 has higher motion stability relative to the electromagnetic brake, thereby leading to higher operation safety of the electric actuator of the application.

In one embodiment, self-centering joint 110 is removably connected to housing 10. The opposite ends of the mating shaft 150 are the mounting ends of the valve stem 120.

A plurality of clamping blocks are circumferentially arranged at two opposite ends of the matching shaft 150, clamping grooves are formed between adjacent clamping blocks, a positioning block matched with the clamping grooves in a clamping way is arranged at one end of the self-centering joint 110, and the self-centering joint 110 is clamped in the clamping grooves through the positioning block so as to be detachably mounted with the matching shaft 150.

Referring to fig. 1 to 4, the self-centering joint 110 may be installed at both ends of the mating shaft 150, so that when the self-centering joint 110 of the electric actuator is installed at the first surface of the housing 10, the electric actuator electrically opens the valve and resets the valve when the power is lost. When the self-centering joint 110 of the electric actuator is mounted on the second face of the housing 10, the electric actuator is electrically closed and the valve is reset and opened without power. The electric actuating mechanism provided by the application can be installed in the forward and backward directions, and simultaneously can realize the functions of resetting and opening and resetting and closing the valve, so that the application range is wider.

Referring to fig. 5, in one embodiment, the self-centering joint 110 includes a bracket 111, a positioning ring 112, an inner claw 113, and an outer claw 114, wherein the positioning ring 112 is provided with at least one positioning pin 115, and the positioning ring 112 is mounted on a mating shaft. The inner jaw 113 and the outer jaw 114 are mounted in the housing 111 by a threaded connection and are adapted to be brought close to each other in the housing 111 to create a closed jaw 116, the jaw 116 being coaxial with the positioning ring 112, the jaw 116 being adapted to engage the valve stem 120.

The bracket 111 has a chamber for accommodating the inner claw 113 and the outer claw 114, a mating hole is formed in the bottom of the bracket 111, the positioning block is arranged on the outer periphery of the mating hole, and the bracket 111 is arranged at the end of the mating shaft 150 through the mating hole and the positioning block to be connected with the mating shaft 150.

The inner jaw 113 and the outer jaw 114 are connected to the support 111 by means of two threaded connections, and when the inner jaw 113 and the outer jaw 114 are mounted opposite each other and are moved towards each other, a closed jaw 116 is created for receiving the valve stem 120. The inner and outer jaws 113, 114 are mounted on the collar 112 by pins that are spaced 180 degrees apart on the collar 112 so that the inner and outer jaws 113, 114 are capable of equal displacement in opposite directions about the geometric center of the collar 112 to form a closed jaw 116 concentric with the geometric center of the collar 112 for accommodating different envelope sizes of the valve stem 120. The positioning ring 112 is simultaneously installed on the bracket 111, and the valve rod 120 is limited by the combined action of the positioning ring 112, the inner claw 113 and the outer claw 114 when being installed, so that the valve rod 120 with different sizes can be automatically centered and can be accommodated.

Specifically, the inner jaw 113 is provided with a first opening 117, the outer jaw 114 is provided with a second opening 118 towards one side of the inner jaw 113, the first opening 117 and the second opening 118 cooperate to form a jaw 116, and the size of the jaw 116 is adjustable, so that valve rods 120 with different sizes can be accommodated.

Referring to fig. 6 to 8, in one embodiment, the gear assembly 30 includes a first gear 310, a second gear 320, and a third gear 330, wherein one end of the first gear 310 is meshed with the output shaft 210, and the other end is meshed with the second gear 320. The gear assembly 30 further includes a return mechanism 340, one end of the return mechanism 340 being engaged with the second gear 320 and the other end being engaged with the third gear 330.

It should be noted that, the first gear 310, the second gear 320 and the third gear 330 are respectively installed on a rotating shaft, the first gear 310, the second gear 320 and the third gear 330 respectively include two gears with different sizes along the axial direction of the rotating shaft, taking the first gear 310 as an example, the first gear 310 includes a large gear and a small gear which are disposed at intervals along the axial direction of the rotating shaft, the large gear and the small gear synchronously rotate, the large gear is meshed with the output shaft 210, and the small gear is meshed with the second gear 320. The second gear 320 and the third gear 330 are the same, and are not described herein, so that the arrangement space of the gear assembly 30 can be reduced.

The periphery of the matching shaft 150 is provided with a sector gear 119, one end of the third gear 330 is meshed with the sector gear 119, one side of the matching shaft 150 is also provided with two adjusting screws 1190 arranged at intervals, and one end of each adjusting screw 1190 faces towards two end faces of the sector gear 119 and is used for limiting the rotation position of the sector gear 119.

The sector gear 119 has two side end surfaces, one corresponding to each of the two adjustment screws 1190, and when the sector gear 119 rotates by rotation of the output shaft 210 of the motor 20, the side end surface of the sector gear 119 rotates toward the adjustment screw 1190 to abut against an end portion of the adjustment screw 1190, thereby realizing rotation stopping.

Further, the reset mechanism 340 includes a manual shaft 341, a fourth gear 342 is sleeved on the manual shaft 341, one end of the fourth gear 342 is meshed with the second gear 320, and the other end is meshed with the third gear 330.

That is, the valve rod 120 can be driven to rotate by the motor 20 or the manual shaft 341, and both modes can be adapted to different use situations.

Further, the reset mechanism 340 further includes a reset spring 343, and the reset spring 343 is sleeved on the manual shaft 341 and located above the fourth gear 342.

The return spring 343 is used for automatically driving the valve rod 120 to rotate to the initial position when the motor 20 is powered off.

Referring to fig. 6 and 7, in one embodiment, the locking mechanism 40 further includes a locking shaft 410, a torsion spring 420 sleeved on the locking shaft 410, and a locking plate 430 sleeved outside the torsion spring 420, wherein the locking plate 430 has a first state and a second state under the rotation of the locking shaft 410; in the first state, one end of the locking plate 430 is clamped on the second gear 320 to lock the position of the valve rod 120; in the second state, the locking plate 430 is disengaged from the second gear 320 under rotation of the torsion spring 420 to be unlocked.

The locking mechanism 40 is used for limiting the rotation position of the valve rod 120 and realizing the manual locking function.

Specifically, the locking plate 430 is tapered toward one end of the second gear 320 for insertion into a backlash between adjacent teeth of the second gear 320.

It should be noted that, during the manual operation, if the position of the electric actuator needs to be kept unchanged, the locking shaft 410 may be manually rotated clockwise, so that the locking plate 430 contacts with the backlash of the second gear 320, at this time, the manual handle is released, the second gear 320 rotates by a slight angle under the action of the return spring 343 to press the locking plate 430, so that the multiple top plates are limited by the bottom plate, the return spring 343 rotates to be braked, the manual locking function is realized, and when the electric actuator is again operated, the locking plate 430 is reset under the action of the torsion spring 420 and is separated from the second gear 320.

In one embodiment, the housing 10 is further provided with a micro switch 130, and the matching shaft 150 is further sleeved with a travel cam 140, and an output end of the micro switch 130 faces the travel cam 140 for switching the motor 20.

The electric actuating mechanism is also provided with a terminal board and a junction box cover for facilitating wiring, and the junction box cover is provided with a plurality of wire outlet holes, so that different requirements can be met. The electric actuating mechanism is also provided with a transformer, so that the requirements of different voltages can be met.

Taking the direction in fig. 6 as an example, the electric actuator can achieve the effects of electric valve opening, power failure valve closing, manual valve opening, manual locking and the like. The specific operation flow is as follows:

the electric valve opening process comprises the following steps: the motor 20 is powered on, the output shaft 210 drives the first gear 310, the second gear 320, the fourth gear 342, the third gear 330 and the sector gear 119 to rotate, and further drives the valve rod 120 to rotate to the valve opening position, and at this time, the valve rod 120 abuts against the end of the adjusting screw 1190. At the same time, the return spring 343 in the return mechanism 340 is in a sustained state of stored energy.

The power-off valve closing process comprises the following steps: the motor 20 is de-energized and the return spring 343 rotates the third gear 330 and the sector gear 119 such that the valve stem 120 automatically returns to the initial valve-closing position.

The manual valve opening process comprises the following steps: the handle rotates the manual shaft 341 and the fourth gear 342 rotates the third gear 330 and the sector gear 119, so that the valve stem 120 rotates to the valve-opening position.

The manual locking process includes: in the manual operation process, if the position of the valve rod 120 is required to be kept unchanged, the locking shaft 410 can be manually rotated, the locking shaft 410 drives the torsion spring 420 to rotate, so that the locking plate 430 rises and contacts with the tooth gap of the second gear 320, then the manual handle is loosened, the second gear 320 rotates by a small angle under the action of the return spring 343 to press the locking plate 430, meanwhile, the locking plate 430 is limited and kept still by the bottom plate, and the return spring 343 rotates to be braked, so that the manual locking function is realized. When the motor is again operated, the locking plate 430 is restored by the torsion spring 420 to be separated from the second gear 320.

The application uses specific words to describe embodiments of the application. Reference to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic is associated with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.

While the application has been described in terms of preferred embodiments, it is not intended to be limiting, but rather to the application, as will occur to those skilled in the art, without departing from the spirit and scope of the application. Therefore, any modification, equivalent variation and modification of the above embodiments according to the technical substance of the present application fall within the protection scope defined by the claims of the present application.

Claims

1. A spring self-resetting electric actuator comprising:

the motor is arranged on the shell and is provided with an output shaft;

2. The spring self-resetting electric actuator as recited in claim 1, wherein the self-centering joint is detachably connected to the mating shaft;

the opposite ends of the matching shaft are the mounting ends of the valve rod.

3. The spring self-resetting electric actuator as recited in claim 2, wherein the self-centering joint comprises a bracket, a positioning ring, an inner jaw and an outer jaw, wherein the positioning ring is provided with at least one positioning pin, and the positioning ring is mounted on the mating shaft;

4. The spring self-resetting electric actuator of claim 3, wherein the inner jaw is provided with a first opening, the outer jaw is provided with a second opening towards one side of the inner jaw, and the first opening and the second opening are matched to form the jaw.

5. The spring self-resetting electric actuator of claim 1, wherein the gear assembly comprises a first gear, a second gear, and a third gear, the first gear having one end engaged with the output shaft and the other end engaged with the second gear;

6. The spring self-resetting electric actuator as recited in claim 5, wherein the resetting mechanism comprises a manual shaft, a fourth gear is sleeved on the manual shaft, one end of the fourth gear is meshed with the second gear, and the other end of the fourth gear is meshed with the third gear.

7. The spring self-resetting electric actuator as recited in claim 6, further comprising a return spring that is nested on the manual shaft and over the fourth gear.

8. The spring self-resetting electric actuator of claim 5, further comprising a locking mechanism comprising a locking shaft, a torsion spring sleeved on the locking shaft, and a locking plate sleeved outside the torsion spring, wherein the locking plate has a first state and a second state under the rotation of the locking shaft;

9. The spring self-resetting electric actuator as recited in claim 8, wherein an end of the locking plate facing the second gear is tapered for insertion into a tooth gap between adjacent teeth of the second gear.

10. The spring self-resetting electric actuator of claim 1, wherein a micro switch is further arranged in the housing, a travel cam is further sleeved outside the matching shaft, and an output end of the micro switch faces to the travel cam for switching on and off the motor.