CN116480830A

CN116480830A - Pneumatic actuator

Info

Publication number: CN116480830A
Application number: CN202310521939.1A
Authority: CN
Inventors: 俞杰锋; 孙小锋; 邹红飞; 陶存位; 何林军
Original assignee: Hangzhou Tangneng Valve Industry Co ltd
Current assignee: Hangzhou Tangneng Valve Industry Co ltd
Priority date: 2023-05-10
Filing date: 2023-05-10
Publication date: 2023-07-25

Abstract

The invention relates to the field of actuators, and discloses a pneumatic actuator, which comprises a cylinder body, an output gear shaft and two groups of pneumatic transmission components, wherein: the cylinder body is provided with an air inlet and an air outlet which are communicated with the inside of the cylinder body; the output gear shaft is rotatably arranged in the middle of the cylinder body, a driving gear is arranged on the output gear shaft, and one end of the output gear shaft extends out of the cylinder body and is used for connecting a valve; the two groups of pneumatic transmission components are arranged in the cylinder body and are symmetrically arranged around the axis center of the output gear shaft, the pneumatic transmission components comprise a piston, a reset spring, a transmission rack and a torque-increasing gear, and the piston is slidably arranged in the cylinder body. The invention can improve the torque provided for the output gear shaft, make the opening process of the valve more stable, reduce the whole volume of the pneumatic actuator and reduce the installation space of the pneumatic actuator.

Description

Pneumatic actuator

Technical Field

The invention relates to the technical field of actuators, in particular to a pneumatic actuator.

Background

The pneumatic actuator is an actuator for opening and closing or adjusting a valve by using air pressure, and is also called a pneumatic actuator or a pneumatic device, but is commonly called a pneumatic head. The existing pneumatic actuator is mainly divided into a film type, a piston type, a shifting fork type, a gear rack type and other structures. Among them, the rack and pinion type pneumatic actuator is most widely used.

The utility model provides a pneumatic actuator of arbitrary adjustable of air-tight aperture of china patent (application number 201920125911.5), includes the cylinder body and sets up the end cover at the cylinder body both ends, is equipped with a plurality of gas ports on the cylinder body, is equipped with two pistons about in the cylinder body, the piston includes piston plectane and the piston arm of being connected with one side periphery one body of piston plectane, is equipped with the rack on the piston arm near one side of cylinder body axle center, and its tooth face of rack on two pistons is relative and all meshes with output tooth axle about, be equipped with resilient means between the end cover of piston and homonymy, the piston plectane is fixed with the one end of pull rod, and the other end of pull rod passes the end cover, is equipped with aperture adjusting nut between its tip and the end cover. The pneumatic actuator in the patent can very conveniently and randomly adjust the opening of the valve within the full stroke range of 0-95 degrees.

The above patent uses a rack and pinion type pneumatic actuator, although the opening of the valve can be arbitrarily adjusted in the full stroke range of 0 ° to 95 °. However, the pneumatic actuator adopting the gear-rack transmission structure generally provides smaller torque for the output gear shaft, so that the opening process of the valve is not stable enough.

Disclosure of Invention

Accordingly, the present invention is directed to a pneumatic actuator for solving the problem of the conventional rack and pinion type pneumatic actuator that the torque provided to the output gear is generally small.

The invention solves the technical problems by the following technical means:

a pneumatic actuator comprising a cylinder block, an output gear shaft, and two sets of pneumatic drive assemblies, wherein:

the cylinder body is provided with an air inlet and an air outlet which are communicated with the inside of the cylinder body;

the output gear shaft is rotatably arranged in the middle of the cylinder body, a driving gear is arranged on the output gear shaft, and one end of the output gear shaft extends out of the cylinder body and is used for connecting a valve;

the pneumatic transmission assembly comprises a piston, a reset spring, a transmission rack and a torque increasing gear, wherein the piston is slidably installed in the cylinder body, the reset spring is installed between the piston and one end, close to the piston, in the cylinder body, one end of the transmission rack is fixed on one side, deviating from the reset spring, of the piston, the torque increasing gear is rotatably installed in the cylinder body, and the torque increasing gear is meshed with the transmission rack and the driving gear, and the number of teeth of the torque increasing gear is smaller than that of teeth of the driving gear.

Further, the transmission rack is meshed with one side, close to the driving gear, of the torque increasing gear.

Further, the thickness of the torque increasing gear is larger than that of the driving gear, the driving gear is meshed with the middle side of the torque increasing gear, the number of the transmission racks in the pneumatic transmission assembly is two, and the two transmission racks of the pneumatic transmission assembly are respectively meshed with the upper side and the lower side of the torque increasing gear.

Further, a range extending groove is formed in one side, facing the driving gear, of the piston, and the end portion of the transmission rack of one pneumatic transmission assembly can be inserted into the range extending groove of the piston of the other pneumatic transmission assembly.

Further, end covers are mounted at two ends of the cylinder body.

Further, a positioning rod matched with the piston is fixed on the end cover, a through hole matched with the positioning rod is formed in the middle of the piston, and the positioning rod penetrates through the through hole of the piston and can move along the axis of the positioning rod.

Further, an outer sealing ring is installed on the outer side wall of the piston, the outer sealing ring is in contact with the inner side wall of the cylinder body, an inner sealing ring is installed in the through hole of the piston, and the inner sealing ring is in contact with the circumferential side wall of the positioning rod.

Further, the number of the springs in the pneumatic transmission assembly is multiple, one end of each spring is abutted against the end cover, and the other end of each spring is abutted against the piston; the end cover is provided with a first spring limit column, the piston is provided with a second spring limit column, one end of the return spring is sleeved on the first spring limit column, and the other end of the return spring is sleeved on the second spring limit column.

Further, a connecting key hole for connecting the valve is arranged at the lower end of the output gear shaft.

Further, a limit cam is arranged on the output gear shaft, the limit cam is provided with a full-open position limit lug and a full-closed position limit lug, and the pneumatic actuator is connected with a full-open position adjusting bolt matched with the full-open position limit lug and a full-closed position adjusting bolt matched with the Quan Guan-position limit lug in a threaded manner.

The invention has the beneficial effects that:

1. through the technical scheme of this application, when the valve is opened to needs, at first adopt outside compressed air source to input compressed gas to the cylinder in through the inlet port, then promote the piston of both sides through compressed gas and remove towards the direction that keeps away from each other respectively to drive the transmission rack and remove, the transmission rack rethread increases turns round the gear and drives the driving gear and rotate, thereby drives output tooth axle rotation, with this purpose that reaches control valve aperture. In the application, the torque increasing gear is additionally arranged between the transmission rack and the driving gear, the number of teeth of the torque increasing gear is smaller than that of teeth of the driving gear, and through the arrangement, the torque provided for the output gear shaft can be greatly improved, so that the rotation process of the output gear shaft is smoother, and the opening process of the valve is smoother.

2. Through the technical scheme of this application, can enough improve the moment of torsion that provides for output gear axle, can reduce pneumatic actuator's whole volume again to this installation space that reduces pneumatic actuator.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of the configuration of a pneumatic actuator in an embodiment of the present application;

FIG. 2 is a cross-sectional view of a first pneumatic actuator in an embodiment of the present application;

FIG. 3 is a second cross-sectional view of the pneumatic actuator of the present embodiment;

FIG. 4 is a schematic diagram of a pneumatic transmission assembly and output gear shaft according to an embodiment of the present application;

FIG. 5 is a cross-sectional view showing a limit cam in an embodiment of the present application;

100, a cylinder block; 110. an air inlet hole; 120. an air outlet hole; 130. an end cap; 131. a positioning rod; 132. a first spring limit post; 140. a rotating shaft; 150. a full-open position adjusting bolt; 160. a full closing position adjusting bolt; 200. an output gear shaft; 210. a drive gear; 220. connecting the key holes; 230. a limit cam; 231. full open position limit bump; 232. full closing limit convex blocks; 310. a piston; 311. a range expansion groove; 312. an outer seal ring; 313. an inner seal ring; 314. the second spring limit column; 320. a return spring; 330. a drive rack; 340. torque increasing gear.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1-5, embodiments of the present application provide a pneumatic actuator that basically includes a cylinder block 100, an output gear shaft 200 and two sets of pneumatic drive assemblies. The cylinder block 100 is provided with a cavity for installing the output gear shaft 200 and the pneumatic transmission assembly, the cylinder block 100 is provided with an air inlet 110 and an air outlet 120 which are communicated with the interior of the cylinder block 100, the air inlet 110 is connected with a compressed air source and is used for controlling air inlet, and the air outlet 120 is mainly used for controlling air loss. In addition, both ends of the cylinder block 100 are mounted with end caps 130 by bolts, facilitating assembly of components inside the cylinder block 100.

The output gear shaft 200 is rotatably installed at the middle portion within the cylinder block 100, and a driving gear 210 is installed on the output gear shaft 200; the lower end of the output gear shaft 200 extends to the outside of the cylinder block 100 and is used for connecting a valve rod of a valve, specifically, the lower end of the output gear shaft 200 is provided with a connecting key hole 220 for connecting the valve rod of the valve, and when the valve rod of the valve is inserted into the connecting key hole 220, the output gear shaft 200 can drive the valve rod of the valve to rotate, so that the opening degree of the valve is controlled.

Both sets of pneumatic drive assemblies are disposed within the cylinder block 100 and are centrally symmetrically disposed about the axis of the output gear shaft 200. Specifically, the pneumatic drive assembly includes a piston 310, a return spring 320, a drive rack 330, and a torque up gear 340. The pistons 310 are slidably mounted on one side of the cylinder block 100 along the length direction of the cylinder block 100, and the pistons 310 of the two sets of pneumatic transmission assemblies are respectively arranged on the left side and the right side of the cylinder block 100, so that a closed cavity is formed in the space between the two pistons 310 in the cylinder block 100, and the air inlet holes 110 and the air outlet holes 120 are uniformly communicated with the closed cavity; a return spring 320 is installed between the piston 310 and one end of the cylinder block 100 near the piston 310 for assisting the return of the piston 310; one end of the drive rack 330 is fixed to the side of the piston 310 facing away from the return spring 320; the cylinder block 100 is rotatably installed with the rotation shaft 140 engaged with the torque increasing gear 340, and the torque increasing gear 340 is rotatably installed in the cylinder block 100 through the rotation shaft 140, and the torque increasing gear 340 is engaged with both the driving rack 330 and the driving gear 210, and in addition, the number of teeth of the torque increasing gear 340 is smaller than that of the driving gear 210.

Through the above technical scheme, when the valve needs to be opened, firstly, an external compressed air source is adopted to input compressed air into the cylinder body 100 through the air inlet 110, then the pistons 310 at two sides are pushed to move in the directions away from each other respectively through the compressed air, so as to drive the transmission rack 330 to move, and the transmission rack 330 drives the driving gear 210 to rotate through the torque increasing gear 340, so that the output gear shaft 200 is driven to rotate, and the purpose of controlling the opening of the valve is achieved. In this embodiment, a torque increasing gear 340 is additionally installed between the driving rack 330 and the driving gear 210, and the number of teeth of the torque increasing gear 340 is smaller than that of the driving gear 210, so that the torque provided to the output gear shaft 200 can be greatly increased, the rotation process of the output gear shaft 200 is smoother, and the opening process of the valve is smoother.

In this embodiment, the drive rack 330 is meshed on a side of the torque up gear 340 that is adjacent to the drive gear 210. Through such setting, can enough increase moment of torsion, can not make the too much installation space of drive rack 330 occupation cylinder block 100 again, can reduce the width of cylinder block 100 to reduce the volume of whole pneumatic actuator, make pneumatic actuator can not occupy too much installation space.

In the present embodiment, the thickness of the torque increasing gear 340 is greater than that of the driving gear 210, and the driving gear 210 is mainly engaged with the middle side of the torque increasing gear 340. The number of the transmission racks 330 in the pneumatic transmission assembly is two, and the two transmission racks 330 of the pneumatic transmission assembly are respectively meshed with the upper side and the lower side of the torque increasing gear 340, and the driving gear 210 is positioned at the middle position of the two transmission racks 330. By this arrangement, the transmission engagement process of the transmission rack 330, the torque increasing gear 340 and the driving gear 210 is more stable.

In this embodiment, the side of the piston 310 facing the driving gear 210 is provided with a spread groove 311, and the end of the driving rack 330 of one pneumatic driving assembly can be inserted into the spread groove 311 of the piston 310 of the other pneumatic driving assembly. By this arrangement, the length of the drive rack 330 can be increased without increasing the length of the cylinder block 100, thereby ensuring the stroke of the piston 310 and thus ensuring that the output gear shaft 200 can achieve an ideal rotation range. And the stroke of the piston 310 can be further increased according to actual requirements, so that the rotatable angle range of the output gear shaft 200 is enlarged.

In this embodiment, the end cap 130 is fixed with a positioning rod 131 that is matched with the piston 310, the middle part of the piston 310 is provided with a through hole that is matched with the positioning rod 131, the positioning rod 131 penetrates through the through hole of the piston 310, and the positioning rod 131 can move along the axis of the positioning rod 131. By the arrangement, the positioning rod 131 can linearly position the piston 310 on the movement track, so that the movement process of the piston 310 is more stable; in addition, compared with the prior art that the positioning rod 131 is fixed on the piston 310, the positioning rod 131 is fixed on the end cover 130, so that the space on two sides of the air outlet cylinder body 100 can be saved, the length of the air outlet cylinder body 100 is reduced, the whole volume of the pneumatic actuator can be further reduced, and the installation space of the pneumatic actuator is reduced.

In the present embodiment, an outer sealing ring 312 is installed on the outer sidewall of the piston 310, and the outer sealing ring 312 contacts with the inner sidewall of the cylinder block 100 to realize sealing between the piston 310 and the cylinder block 100; the piston 310 is provided with an inner sealing ring 313 in the through hole, and the inner sealing ring 313 is contacted with the circumferential side wall of the positioning rod 131, so that the sealing between the piston 310 and the positioning rod 131 is realized.

In this embodiment, the number of springs in the pneumatic transmission assembly is plural, in this embodiment, two springs are specifically provided, one end of each spring abuts against the end cover 130, the other end abuts against the piston 310, and after the cylinder block 100 loses air, the pneumatic transmission assembly is reset by the reset spring 320. In addition, be equipped with first spring spacing post 132 on the end cover 130, be equipped with second spring spacing post 314 on the piston 310, reset spring 320's one end cover is established on first spring spacing post 132, and the other end cover is established on second spring spacing post 314, carries out spacingly to reset spring 320 through first spring spacing post 132 and second spring spacing post 314, the installation of the reset spring 320 of being convenient for.

In this embodiment, the output gear shaft 200 is mounted with a limit cam 230, and the limit cam 230 can rotate synchronously with the output gear shaft 200. The limit cam 230 is provided with a full-open position limit bump 231 and a full-closed position limit bump 232, and the pneumatic actuator is in threaded connection with a full-open position adjusting bolt 150 matched with the full-open position limit bump 231 and a full-closed position adjusting bolt 160 matched with the full-closed position limit bump 232.

The pneumatic actuator provided by the invention is described in detail above. The description of the specific embodiments is only intended to aid in understanding the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

It should be noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. The pneumatic actuator is characterized by comprising a cylinder block (100), an output gear shaft (200) and two groups of pneumatic transmission assemblies, wherein:

an air inlet hole (110) and an air outlet hole (120) which are communicated with the interior of the cylinder body (100) are formed in the cylinder body (100);

the output gear shaft (200) is rotatably arranged in the middle of the cylinder body (100), a driving gear (210) is arranged on the output gear shaft (200), and one end of the output gear shaft (200) extends out of the cylinder body (100) and is used for connecting a valve;

the two sets of pneumatic transmission assemblies are arranged in the cylinder block (100) and are arranged symmetrically about the axis center of the output gear shaft (200), each pneumatic transmission assembly comprises a piston (310), a return spring (320), a transmission rack (330) and a torque increasing gear (340), each piston (310) is slidably mounted in the cylinder block (100), each return spring (320) is mounted between each piston (310) and one end, close to each piston (310), in the cylinder block (100), one end of each transmission rack (330) is fixed on one side, away from each return spring (320), of each piston (310), each torque increasing gear (340) is rotatably mounted in the cylinder block (100), each torque increasing gear (340) is meshed with each transmission rack (330) and each driving gear (210), and the number of teeth of each torque increasing gear (340) is smaller than that of each driving gear (210).

2. The pneumatic actuator of claim 1, wherein the drive rack (330) is meshed on a side of the torque up gear (340) proximate the drive gear (210).

3. The pneumatic actuator according to claim 2, wherein the thickness of the torque increasing gear (340) is larger than that of the driving gear (210), the driving gear (210) is meshed with the middle side of the torque increasing gear (340), the number of the transmission racks (330) in the pneumatic transmission assembly is two, and the two transmission racks (330) of the pneumatic transmission assembly are meshed with the upper side and the lower side of the torque increasing gear (340) respectively.

4. A pneumatic actuator according to claim 3, wherein the side of the piston (310) facing the driving gear (210) is provided with a spreading groove (311), wherein the end of the driving rack (330) of one of the pneumatic drive assemblies can be inserted into the spreading groove (311) of the piston (310) of the other pneumatic drive assembly.

5. The pneumatic actuator of claim 1, wherein end caps (130) are mounted to both ends of the cylinder block (100).

6. The pneumatic actuator according to claim 5, wherein a positioning rod (131) which is matched with the piston (310) is fixed on the end cover (130), a through hole which is matched with the positioning rod (131) is formed in the middle of the piston (310), the positioning rod (131) penetrates through the through hole of the piston (310), and the positioning rod (131) can move along the axis of the positioning rod (131).

7. The pneumatic actuator according to claim 6, wherein an outer sealing ring (312) is mounted on an outer sidewall of the piston (310), the outer sealing ring (312) being in contact with an inner sidewall of the cylinder block (100), the piston (310) being mounted with an inner sealing ring (313) in the through hole, the inner sealing ring (313) being in contact with a circumferential sidewall of the positioning rod (131).

8. The pneumatic actuator of claim 5, wherein the number of springs in the pneumatic drive assembly is a plurality, and one end of the springs is abutted against the end cap (130) and the other end is abutted against the piston (310); be equipped with first spring spacing post (132) on end cover (130), be equipped with second spring spacing post (314) on piston (310), reset spring (320) one end cover is established on first spring spacing post (132), the other end cover is established on second spring spacing post (314).

9. The pneumatic actuator according to claim 1, wherein a connecting key hole (220) for connecting a valve is provided at a lower end of the output gear shaft (200).

10. The pneumatic actuator according to claim 1, wherein the output gear shaft (200) is provided with a limit cam (230), the limit cam (230) is provided with a full-open limit bump (231) and a full-close limit bump (232), and the pneumatic actuator is connected with a full-open adjusting bolt (150) matched with the full-open limit bump (231) and a full-close adjusting bolt (160) matched with the Quan Guan limit bump (232) in a threaded manner.