CN114439995A

CN114439995A - Valve booster

Info

Publication number: CN114439995A
Application number: CN202210092247.5A
Authority: CN
Inventors: 梁的; 高文霄; 李健; 黄远程; 孙鹏远; 高勇
Original assignee: China Nuclear Industry Maintenance Co Ltd
Current assignee: China Nuclear Industry Maintenance Co Ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-05-06
Anticipated expiration: 2042-01-26
Also published as: CN114439995B

Abstract

The application provides a valve power assisting device, which comprises a shell, a driving assembly and a torque output piece. The housing is for a user to hold. The drive assembly is arranged in the inner cavity of the shell and comprises a motor and a drive shaft in transmission connection with an output shaft of the motor. The torque output piece is in transmission connection with the driving shaft and is provided with a connecting part for connecting a valve rod of the valve to be opened and closed, so that the valve can be opened and closed by driving the valve rod to rotate through the connecting part. According to the valve power assisting device, the motor is used as a power source to replace manual work to output torque to the valve rod, so that the labor intensity of operating personnel is reduced, and the working efficiency is improved; because the work efficiency is promoted, the stay time of the operating personnel on the spot is obviously reduced, the contact time of dangerous goods is further reduced, and the health and the safety of the operating personnel are ensured.

Description

Valve booster

Technical Field

The application relates to the technical field of valves, in particular to a valve power assisting device.

Background

In the maintenance industry of chemical equipment, power plant equipment and the like, the number of valve equipment is large, and the workload of valve maintenance is large. Wherein like the large-scale manual valve of types such as some butterfly valves, blast gate and manual gate valve among the important liquid conveying system, single switch need rotate the hand wheel of valve more than hundred circles, it is long for tens of minutes, and need switch valve many times in maintenance, experimentation, not only consuming time hard to there is great potential safety hazard still, the concrete performance is: the valve is rotated for a long time, the attention of operators is completely focused on the action of operating the valve, and dangerous and unexpected conditions of the field environment are easily ignored; the long-term operation of the valves exposes the operating personnel to an excessive amount of dangerous objects, such as, in particular, radiation in the nuclear island building; in addition, the risk of injury of hands of people is increased.

In conclusion, in the process of testing and overhauling the large manual valve, the hand wheel is completely driven by manpower to complete the operation of the valve, and the large manual valve has the defects of low working efficiency, high labor intensity, potential safety hazard and the like.

Disclosure of Invention

The application provides a valve booster unit, through setting up drive assembly and torque output spare, can assist the operation personnel to carry out rotary switch to manual valve to work efficiency that has when solving among the prior art manual to manual valve operate is low, intensity of labour is big, there is the technical problem of potential safety hazard.

The application provides a valve booster unit, including casing, drive assembly and torque output spare.

The housing is for a user to hold.

The drive assembly is arranged in the inner cavity of the shell and comprises a motor and a drive shaft in transmission connection with an output shaft of the motor.

The torque output piece is in transmission connection with the driving shaft and is provided with a connecting part for connecting a valve rod of the valve to be opened and closed, so that the valve can be opened and closed by driving the valve rod to rotate through the connecting part.

The valve booster device in this application need demolish the hand wheel of valve before the operation, after connecting portion and valve rod are directly or indirectly connected, the starter motor drives drive axle, torque output spare, connecting portion rotatory, and it is rotatory to drive the valve rod by connecting portion again to manual drive hand wheel and the rotatory operation of valve rod have been replaced. According to the valve power assisting device provided by the embodiment of the application, the motor is used as a power source to replace manual work to output torque to the valve rod, so that the labor intensity of operating personnel is reduced, and the working efficiency is improved; the working efficiency is improved, so that the stay time of the operating personnel on the spot is obviously reduced, the contact time of dangerous articles is further reduced, and the health and the safety of the operating personnel are ensured; and when the valve is opened and closed, the hands of the operator do not directly contact the valve, so that the risk that the hands are squeezed by the valve is reduced, attention can be transferred to the field environment, the dangerous condition of the field environment is more sensitive, and the safety during operation is further improved.

In one possible embodiment, the drive assembly further comprises a transmission mechanism drivingly connected between the motor and the drive shaft, and the torques of the drive shaft and the torque output element are changeable by a shift operation of the transmission mechanism.

In a possible design mode, a main rotating gear set and a driven rotating gear are respectively sleeved on an output shaft of the motor and the driving shaft, and the main rotating gear set comprises a large main rotating gear, a middle main rotating gear and a small main rotating gear which are used for matching the number of gear revolutions;

the speed change mechanism comprises an output gear meshed with the driven gear, and a large transmission gear, a middle transmission gear and a small transmission gear which are used for matching the number of gear revolutions, the output gear, the large transmission gear, the middle transmission gear and the small transmission gear are all fixedly sleeved on a movable shaft, and two ends of the movable shaft extend to the outside of the shell for being pushed by a user;

the pushed movable shaft can move axially and drive the large transmission gear, the middle transmission gear and the small transmission gear to move so as to engage with the corresponding small main rotating gear, the middle main rotating gear and the large main rotating gear, and therefore the torque of the driving shaft and the torque output piece can be changed by carrying out conversion operation on the speed change mechanism.

In a possible design mode, the inner cavity of the shell is provided with a first shaft mounting seat and a second shaft mounting seat which are arranged oppositely, the output shaft and the movable shaft are connected between the first shaft mounting seat and the second shaft mounting seat in a rotating mode, the movable shaft can axially move on the first shaft mounting seat and the second shaft mounting seat, and the outer side of the second shaft mounting seat is connected with the driving shaft in a rotating mode.

In one possible embodiment, the valve power assist device further includes:

and the overload protection mechanism is used for connecting or separating the driving shaft and the torque output piece so as to disconnect the driving shaft from the transmission of the torque output piece when the valve rod rotates to the position.

In a possible design, overload protection mechanism includes elastic component and guide way, drive epaxial being close to the position of torque output spare slide set up in the guide way, drive the pivot can swing in the guide way so that drive the pivot with torque output spare connects or separates, the elastic component connect in the casing with between the drive pivot, can be for drive the pivot and provide the effort of restoring to the throne when the swing.

In one possible embodiment, the rotational axes of the drive shaft and the torque output element are perpendicular to one another.

In one possible embodiment, the drive shaft and the torque output element are each fitted with a first bevel gear and a second bevel gear, which are in meshing engagement with one another.

In one possible design, the ratio of the length of the driving shaft to the overall length of the valve servo unit is 4-6: 10.

in one possible embodiment, the motor is a pneumatic motor or a hydraulic motor.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic view of an example of a valve booster according to an embodiment of the present disclosure;

FIG. 2 is a schematic view from another perspective of FIG. 1;

fig. 3 is a schematic view of an example of a transmission mechanism according to an embodiment of the present application;

FIG. 4 is a schematic view of FIG. 3 in another state;

FIG. 5 is a schematic view of FIG. 3 in still another state;

fig. 6 is a schematic diagram of an example of an overload protection mechanism provided in an embodiment of the present application;

fig. 7 is a schematic view of fig. 6 in another state.

Reference numerals: 10. a housing; 11. a first shaft mounting seat; 12. a second shaft mounting seat; 20. a drive assembly; 21. a motor; 211. an output shaft; 212. a main rotating gear set; 212a, a large main rotating gear; 212b, a middle main rotating gear; 212c, a small main rotating gear; 22. a driving shaft; 221. a driven gear; 222. a first bevel gear; 23. a speed change mechanism; 231. an output gear; 232. a large transmission gear; 233. a middle transmission gear; 234. a small drive gear; 235. a movable shaft; 30. a torque output member; 31. a connecting portion; 32. a second bevel gear; 41. an elastic member; 42. a guide groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise. In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description of the present application, it is to be understood that the terms "inner," "outer," "upper," "bottom," "front," "back," and the like, when used in the orientation or positional relationship indicated in FIG. 1, are used solely for the purpose of facilitating a description of the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

It should be noted that the same reference numerals are used to denote the same components or parts in the embodiments of the present application, and for the same parts in the embodiments of the present application, only one of the parts or parts may be given the reference numeral, and it should be understood that the reference numerals are also applicable to the other same parts or parts.

For example, in the nuclear power maintenance industry, for example, in the large manual valves such as a part of butterfly valves (DN 1000 or more), EBA (containment ventilation system) air valves and manual gate valves (DN 500 or more) in important plant water systems, a hand wheel needs to be rotated for more than 600 circles for a single switch, and the time is about 20 minutes. At present, this kind of valve is in experimental, maintenance in-process, all relies on the manpower drive hand wheel to accomplish completely to need double cooperation, the operation process is wasted time and energy, and causes crowded wound of personnel's hand easily, and in addition, these large-scale manual valves distribute in each production factory building of nuclear power station, and the surrounding environment is complicated, still need consider operation environment dose rate problem in the especially nuclear island factory building. Therefore, a portable, safe and reliable device is urgently needed in the field to assist in completing valve maintenance work.

In order to solve the technical problem, the application provides a valve power assisting device, through setting up drive assembly and torque output spare, can assist the operation personnel to carry out rotary switch to manual valve to solve the technical problem that work efficiency that has among the prior art when the manual valve is operated to the manual valve is low, intensity of labour is big, there is the potential safety hazard.

As shown in fig. 1 and 2, the valve power assisting device according to the embodiment of the present invention includes a housing 10, a driving assembly 20, and a torque output member 30.

The housing 10 is held by a user. The housing 10 is shaped to be held by a user's hand, such as a cylindrical structure. The housing 10 has a cavity therein for accommodating the motor 21, the driving shaft 22, the bearing, the mounting seat, and the fixing frame.

The driving assembly 20 is disposed in the inner cavity of the housing 10, and the driving assembly 20 includes a motor 21 and a driving shaft 22 in transmission connection with an output shaft 211 of the motor 21.

The torque output member 30 is in transmission connection with the driving shaft 22, the torque output member 30 is provided with a connecting portion 31 for connecting a valve rod of the valve to be opened and closed, and after the torque output by the motor 21 is sequentially transmitted to the driving shaft 22, the torque output member 30 and the connecting portion 31, the valve rod of the valve is driven to rotate through the connecting portion 31.

The valve power assisting device provided by the embodiment of the application needs to dismantle the hand wheel of the valve before operation, directly or indirectly connects the connecting part 31 with the valve rod, then the starting motor 21 drives the driving shaft 22, the torque output part 30 and the connecting part 31 to rotate, and the connecting part 31 drives the valve rod to rotate, so that the manual driving hand wheel and the valve rod rotating operation are replaced. According to the valve power assisting device provided by the embodiment of the application, the motor 21 is used as a power source to replace manual work to output torque to the valve rod, so that the labor intensity of operators is reduced, and the working efficiency is improved; the working efficiency is improved, so that the stay time of the operating personnel on the spot is obviously reduced, the contact time of dangerous articles is further reduced, and the health and the safety of the operating personnel are ensured; and when the valve is opened and closed, the hands of the operator do not directly contact the valve, so that the risk that the hands are squeezed by the valve is reduced, attention can be transferred to the field environment, the dangerous condition of the field environment is more sensitive, and the safety during operation is further improved.

Alternatively, the connection 31 of the torque output member 30 and the valve stem may be directly connected.

Specifically, the connecting portion 31 may be shaped as a special shaft and inserted into a shaft groove of the corresponding valve stem, so that the connecting portion 31 and the valve stem are circumferentially fixed and can rotate synchronously.

Specifically, the connecting portion 31 may be shaped as a sleeve that is sleeved outside the valve stem, and is circumferentially fixed to the valve stem so as to be capable of rotating synchronously.

Alternatively, the connection 31 of the torque output element 30 and the valve rod may also be connected indirectly.

Specifically, an engagement member, such as a sleeve or a coupling, is detachably disposed between the connection portion 31 and the valve stem, so that the connection portion 31 and the valve stem are circumferentially fixed and can rotate synchronously.

Alternatively, the motor 21 may be a servo motor stepping motor capable of controlling the rotation speed, and may be a general pneumatic motor, hydraulic motor, or electric motor.

Specifically, in order to reduce the equipment cost, the ordinary motor 21 is selected as the power source.

As shown in fig. 3-5, in one embodiment, the drive assembly 20 further includes a speed change mechanism 23 drivingly connected between the motor 21 and the drive shaft 22, and the torque of the drive shaft 22 and the torque output member 30 is changeable by a shifting operation of the speed change mechanism 23.

In this embodiment, the torque and speed of the valve servo unit can be adjusted to accommodate valves of different resistances. For this purpose, a speed change mechanism 23 is additionally provided between the motor 21 and the drive shaft 22, and the torque and the rotation speed of the drive shaft 22 and the torque output member 30 can be changed by performing a change operation on the speed change mechanism 23.

In operation, the device can be opened to open and close the valve by selecting a proper gear of the transmission mechanism 23 according to the valve condition on site.

Alternatively, the shift mechanism 23 may be a continuously variable shift mechanism. Specifically, the shift mechanism 23 is a belt type continuously variable shift mechanism.

In order to save the manufacturing cost and the running cost, a speed change gear group is adopted as the speed change mechanism 23. As shown in fig. 3 to 5, in one embodiment, a driving gear set 212 and a driven gear 221 are respectively fixed to the output shaft 211 of the motor 21 and the driving shaft 22, and the driving gear set 212 includes a large driving gear 212a, a medium driving gear 212b, and a small driving gear 212c for matching the number of gear revolutions.

The speed change mechanism 23 includes an output gear 231 engaged with the driven gear 221, and a large transmission gear 232, a middle transmission gear 233 and a small transmission gear 234 for matching the number of gear revolutions, wherein the output gear 231, the large transmission gear 232, the middle transmission gear 233 and the small transmission gear 234 are all fixedly sleeved on a movable shaft 235, and two ends of the movable shaft 235 extend to the outside of the housing 10 for being pushed by a user.

The pushed movable shaft 235 can move axially and drive the large transmission gear 232, the middle transmission gear 233 and the small transmission gear 234 to move so as to engage with the corresponding small main rotating gear 212c, the middle main rotating gear 212b and the large main rotating gear 212a, thereby realizing the purpose of changing the torque of the driving shaft 22 and the torque output member 30 by performing a change operation on the speed change mechanism 23.

The layout of the large main rotation gear 212a, the medium main rotation gear 212b, and the small main rotation gear 212c on the output shaft 211 of the motor 21 is such that the medium main rotation gear 212b, the small main rotation gear 212c, and the large main rotation gear 212a are arranged in this order from left to right.

The output gear 231, the large transmission gear 232, the middle transmission gear 233, and the small transmission gear 234 are arranged on the movable shaft 235 such that the middle transmission gear 233, the large transmission gear 232, the small transmission gear 234, and the output gear 231 are arranged in this order from left to right.

The power is equal to the product of the torque and the rotation speed, i.e. the output power of the motor 21 is rated, the larger the rotation speed, the smaller the torque. The speed change mechanism 23 in the present embodiment provides three torque adjustment schemes for the driving shaft 22 and the torque output member 30, and the specific adjustment procedures are as follows:

first, the valve is a large rotating speed and a small torque, as shown in fig. 3, the user pushes the movable shaft 235 to the rightmost end, so that the large driving gear 212a is meshed with the small transmission gear 234, the torque of the motor 21 is transmitted through the output shaft 211, the large driving gear 212a, the small transmission gear 234, the movable shaft 235, the output gear 231, the driven gear 221, the driving shaft 22 and the torque output member 30 in sequence, at this time, the rotating speed of the driving shaft 22 and the torque output member 30 is the maximum, the torque is the minimum, and the valve can correspondingly rotate with small resistance.

Secondly, the valve has a small rotating speed and a large torque, as shown in fig. 4, a user pushes the movable shaft 235 to the left on the basis of the state one, so that the small main rotating gear 212c is meshed with the large transmission gear 232, the torque of the motor 21 is transmitted through the output shaft 211, the small main rotating gear 212c, the large transmission gear 232, the movable shaft 235, the output gear 231, the secondary rotating gear 221, the driving shaft 22 and the torque output member 30 in sequence, and at this time, the rotating speed of the driving shaft 22 and the torque output member 30 is the minimum, the torque is the maximum, and the valve can correspondingly rotate with large resistance.

Third, the middle rotating speed and the middle torque, as shown in fig. 5, the user pushes the movable shaft 235 to the left on the basis of the state two, so that the middle main rotating gear 212b is meshed with the middle transmission gear 233, the torque of the motor 21 is transmitted sequentially through the output shaft 211, the middle main rotating gear 212b, the middle transmission gear 233, the movable shaft 235, the output gear 231, the slave rotating gear 221, the driving shaft 22 and the torque output member 30, and at this time, the rotating speeds of the driving shaft 22 and the torque output member 30 are moderate, the torques are moderate, and the valves with relatively low rotating resistance can be corresponded.

When the speed change gear set is changed, the output gear 231 is always meshed with the driven gear 221 and is kept in transmission connection.

Alternatively, the output shaft 211, the driving shaft 22 and the movable shaft 235 are mounted and supported on the housing 10 by correspondingly disposed bearings.

As shown in fig. 3-5, in an embodiment, the inner cavity of the housing 10 is provided with a first shaft mounting seat 11 and a second shaft mounting seat 12 which are oppositely arranged, the output shaft 211 and the movable shaft 235 are rotatably connected between the first shaft mounting seat 11 and the second shaft mounting seat 12, the movable shaft 235 is further axially movable on the first shaft mounting seat 11 and the second shaft mounting seat 12, and the driving shaft 22 is rotatably connected to the outer side of the second shaft mounting seat 12.

The present embodiment further defines the mounting manner of the output shaft 211 and the movable shaft 235 on the housing 10. Through set up axle mount pad one 11 and axle mount pad two 12 in the inner chamber of casing 10, the both ends of output shaft 211 rotate respectively and connect on axle mount pad one 11 and axle mount pad two 12, loose axle 235 also rotates and connects on axle mount pad one 11 and axle mount pad two 12 to loose axle 235 still can be at axle mount pad one 11 and axle mount pad two 12 axial activity, promptly, the user can promote the loose axle 235 and move about, so that drive gear meshes with the main commentaries on classics gear that corresponds.

In addition, the present embodiment further defines the mounting manner of the driving shaft 22 on the housing 10. One end of the driving shaft 22 may be rotatably connected to the outer side of the second shaft mounting seat 12, and the other end of the driving shaft 22 may be installed in the housing 10 through a bearing.

Optionally, the first shaft mounting seat 11 and the second shaft mounting seat 12 may be provided with shaft holes, and the output shaft 211, the driving shaft 22 and the movable shaft 235 may be directly inserted into the shaft holes for rotational connection.

Optionally, bearings may be further added in the shaft holes to further reduce the rotational resistance of the output shaft 211, the driving shaft 22, and the movable shaft 235 with the first shaft mounting seat 11 and the second shaft mounting seat 12.

Specifically, the inner ring of the bearing is connected to the output shaft 211, the driving shaft 22 and the movable shaft 235, and the outer ring is fixed to the hole wall of the shaft hole.

In one embodiment, the valve assist device further comprises:

and an overload protection mechanism for connecting or disconnecting the driving shaft 22 and the torque output member 30 so as to disconnect the driving shaft 22 from the torque output member 30 when the valve rod is rotated to the position.

To better protect the valve servo unit and the components of the valve to be opened and closed from damage, such as the drive gear, valve stem threads, etc., an overload protection mechanism can decouple the drive shaft 22 from the torque output member 30 when the valve stem is rotated into position.

Alternatively, the overload protection mechanism may be an automatic mechanism, such as a sensor and a controller, after the valve rod is rotated to the position, the resistance of the driving shaft may become large rapidly, at this moment, the resistance value applied to the driving shaft is monitored by the sensor and sent to the controller, and the controller immediately controls the motor 21 to stop after receiving the information.

As shown in fig. 6 and 7, in an embodiment, the overload protection mechanism includes an elastic member 41 and a guide groove 42, a portion of the driving shaft 22 close to the torque output member 30 is slidably disposed in the guide groove 42, the driving shaft 22 can swing in the guide groove 42 to connect or disconnect the driving shaft 22 and the torque output member 30, and the elastic member 41 is connected between the housing 10 and the driving shaft 22 and can provide a restoring force for the driving shaft 22 during swinging.

The present embodiment specifically defines the design of the overload protection mechanism. The overload protection mechanism mainly comprises an elastic piece 41 and a guide groove 42, when the overload protection mechanism is in normal use, as shown in fig. 6, the elastic piece 41 pulls the driving shaft 22 upwards to enable the driving shaft 22 to be in transmission connection with the torque output piece 30, when the valve rod rotates to a position, the torque output piece 30 stops rotating, at the moment, the driving shaft 22 is also subjected to the torque action of the motor 21, the driving shaft 22 can move in the radial direction under the condition that the circumferential direction is limited, and under the guide action of the guide groove 42, as shown in fig. 7, the driving shaft 22 swings downwards and is disconnected from the transmission of the torque output piece 30.

Alternatively, the guide slot 42 may be formed by a circular pie located within the housing 10.

Alternatively, in order to reduce the rotational friction resistance of the driving shaft 22 in the guide groove 42, a bearing may be sleeved on the driving shaft 22 and then placed in the guide groove 42 through the bearing, and the outer ring of the bearing is slidably connected with the groove wall of the guide groove 42.

Alternatively, the elastic member 41 may be a spring, a tension spring, a rubber sheet, or the like.

In one embodiment, the drive shaft 22 and the torque output member 30 have axes of rotation that are perpendicular to each other.

For convenience of use, the drive shaft 22 is prevented from standing above the valve stem to allow the user to operate the valve stem on the side of the valve, and therefore in this embodiment, the drive shaft 22 and the torque output member 30 have their axes of rotation perpendicular to each other.

Alternatively, a worm may be provided on the drive shaft 22 and a worm gear provided on the bottom of the torque output member 30, thereby achieving that the drive shaft 22 and the rotation axis of the torque output member 30 are perpendicular to each other.

As shown in fig. 6 and 7, in one embodiment, the drive shaft 22 and the torque output member 30 are sleeved with a first bevel gear 222 and a second bevel gear 32, respectively, that are inherently meshed.

As mentioned above, the rotation axes of the driving shaft 22 and the torque output member 30 are perpendicular to each other, and in this embodiment, they can be implemented by bevel gears. Bevel gears, also known as bevel gears, are used for transmission between intersecting shafts, and the direction of transmission can be changed.

Specifically, a first bevel gear 222 is fixedly sleeved at the tail end of the driving shaft 22, a second bevel gear 32 is fixedly sleeved at the bottom of the torque output member 30, and the first bevel gear 222 and the second bevel gear 32 are meshed, so that the driving shaft 22 is in transmission connection with the torque output member 30, and the rotation axes of the driving shaft 22 and the torque output member 30 are perpendicular to each other.

In one embodiment, the ratio of the length of the driving shaft 22 to the overall length of the valve servo unit is 4-6: 10.

for better protection user, make user's hand relatively far away from torque output spare 30, drive pivot 22 still has certain length simultaneously so that the end can have certain elasticity, makes drive pivot 22 can realize the luffing motion and separate with torque output spare 30, consequently in this embodiment, the length of drive pivot 22 and the overall length of valve booster unit's ratio is 4 ~ 6: 10.

in one embodiment, the motor 21 is a pneumatic motor or a hydraulic motor.

In some usage environments, the motor 21 cannot be electrically powered in view of explosion-proof requirements, and is normally in a power-off state during maintenance.

In view of the above, it is preferable to use a pneumatic motor or a hydraulic motor.

A pneumatic motor is also called a pneumatic motor, and means a device for converting pressure energy of compressed air into mechanical energy for rotation. The pneumatic motors are classified by structure: vane pneumatic motors, piston pneumatic motors, compact vane pneumatic motors, compact piston pneumatic motors.

The hydraulic motor is an actuator of the hydraulic system, which converts the hydraulic pressure energy provided by the hydraulic pump into mechanical energy (torque and rotational speed) of its output shaft 211. Liquids are media that transmit forces and motions.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A valve assist device, comprising:

a housing (10) for holding by a user;

the driving assembly (20) is arranged in the inner cavity of the shell (10), and the driving assembly (20) comprises a motor (21) and a driving shaft (22) in transmission connection with an output shaft (211) of the motor (21);

the torque output piece (30) is in transmission connection with the driving shaft (22), and the torque output piece (30) is provided with a connecting part (31) used for connecting a valve rod of the valve to be opened and closed so as to drive the valve rod to rotate through the connecting part (31) to open and close the valve.

2. Valve assistance device according to claim 1, wherein the drive assembly (20) further comprises a gear shift mechanism (23) drivingly connected between the motor (21) and the drive shaft (22), the torque of the drive shaft (22) and the torque output member (30) being changeable by a shifting operation of the gear shift mechanism (23).

3. The valve power-assisted device according to claim 2, characterized in that a main rotating gear set (212) and a driven rotating gear (221) are respectively sleeved on the output shaft (211) of the motor (21) and the driving shaft (22), and the main rotating gear set (212) comprises a large main rotating gear (212a), a middle main rotating gear (212b) and a small main rotating gear (212c) which are used for matching the number of gear revolutions;

the speed change mechanism (23) comprises an output gear (231) meshed with the driven gear (221), and a large transmission gear (232), a middle transmission gear (233) and a small transmission gear (234) which are used for matching the number of gear revolutions, wherein the output gear (231), the large transmission gear (232), the middle transmission gear (233) and the small transmission gear (234) are fixedly sleeved on a movable shaft (235), and two ends of the movable shaft (235) extend to the outside of the shell (10) for being pushed by a user;

the pushed movable shaft (235) can move axially and drive the large transmission gear (232), the middle transmission gear (233) and the small transmission gear (234) to move so as to engage the corresponding small main rotating gear (212c), the middle main rotating gear (212b) and the large main rotating gear (212a), and therefore the torque of the driving shaft (22) and the torque output part (30) can be changed by carrying out conversion operation on the speed change mechanism (23).

4. The valve power assisting device according to claim 3, wherein the inner cavity of the housing (10) is provided with a first shaft mounting seat (11) and a second shaft mounting seat (12) which are oppositely arranged, the output shaft (211) and the movable shaft (235) are rotatably connected between the first shaft mounting seat (11) and the second shaft mounting seat (12), the movable shaft (235) can also axially move on the first shaft mounting seat (11) and the second shaft mounting seat (12), and the driving shaft (22) is rotatably connected to the outer side of the second shaft mounting seat (12).

5. The valve gate booster of any one of claims 1-4, further comprising:

and the overload protection mechanism is used for connecting or separating the driving shaft (22) and the torque output piece (30) so as to disconnect the driving shaft (22) from the transmission of the torque output piece (30) when the valve rod is rotated to the position.

6. The valve power assisting device according to claim 5, wherein the overload protection mechanism comprises an elastic member (41) and a guide groove (42), a portion of the driving shaft (22) close to the torque output member (30) is slidably disposed in the guide groove (42), the driving shaft (22) can swing in the guide groove (42) to connect or separate the driving shaft (22) and the torque output member (30), and the elastic member (41) is connected between the housing (10) and the driving shaft (22) to provide a reset acting force for the driving shaft (22) when swinging.

7. Valve boosting device according to claim 1, wherein the drive shaft (22) and the rotational axis of the torque output member (30) are perpendicular to each other.

8. Valve assist device according to claim 7, characterized in that the drive shaft (22) and the torque output member (30) are fitted with a first bevel gear (222) and a second bevel gear (32), respectively, which are inherently meshed.

9. Valve servo unit according to any of claims 1-4, 6-8, wherein the ratio of the length of the driving shaft (22) to the overall length of the valve servo unit is 4-6: 10.

10. valve boosting device according to any one of claims 1-4, 6-8, wherein the motor (21) is a pneumatic motor or a hydraulic motor.