CN113669497A

CN113669497A - Straight stroke transmission device for valve actuator

Info

Publication number: CN113669497A
Application number: CN202110804981.5A
Authority: CN
Inventors: 顾荣玉; 梁军
Original assignee: Jiangsu Haibo Fluid Control Co ltd
Current assignee: Jiangsu Haibo Fluid Control Co ltd
Priority date: 2021-07-16
Filing date: 2021-07-16
Publication date: 2021-11-19
Anticipated expiration: 2041-07-16
Also published as: CN113669497B

Abstract

The invention discloses a straight stroke transmission device for a valve actuator, and belongs to the technical field of valve actuators. Mainly including the hinge bar, sliding sleeve and connecting piece, the one end that the hinge bar corresponds the connecting piece is provided with first arc surface, the position that is located first arc surface on the hinge bar is provided with the coupler body, the opening has been seted up on the coupler body, at lock state, hinge bar and screw rod collineation, and the hinge bar is fixed for the screw rod, the one end that the connecting piece corresponds the hinge bar is equipped with the key seat, fixed mounting has the round pin on the key seat, the tip of key seat is equipped with the second arc surface, the round pin is used for making connecting piece and hinge bar switch to connection status, at connection status, hinge bar and connecting piece collineation, the opening lock is on the round pin on the coupler body, and first arc surface offsets with the second arc surface and holds. The invention relates to a straight stroke transmission device for a valve actuator, which can be used for connecting the valve actuator and a valve and simplifying the process of disassembly and assembly.

Description

Straight stroke transmission device for valve actuator

Technical Field

The invention relates to the technical field of straight stroke transmission devices for valve actuators, in particular to a straight stroke transmission device for a valve actuator.

Background

A linear actuator for a valve actuator is used in conjunction with a rotary valve actuator to convert circular motion of the rotary valve actuator into linear motion and thereby control a linear valve (e.g., a gate valve). The existing straight stroke transmission device for the valve actuator comprises a base body, a screw nut connected to the base body in a rotating mode and a screw rod installed in the screw nut in a matching mode, the straight stroke transmission device for the valve actuator is fixedly installed between the valve actuator and a valve during use, the screw rod is connected with a valve rod of the valve through a coupling matching bolt, and therefore when the valve or the valve actuator is required to be detached and maintained, the connecting structure of the base body is not only detached, and complex detaching work is carried out on the screw rod and the valve rod.

It is therefore desirable to provide a new linear actuator for a valve actuator that addresses the above-mentioned problems.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the straight stroke transmission device for the valve actuator is used for connecting the valve actuator and a valve, and the process of assembling and disassembling can be simplified.

The technical scheme adopted by the invention for solving the technical problems is as follows: a straight stroke transmission device for a valve actuator comprises a seat body, a screw nut and a screw; the straight stroke transmission device for the valve actuator further comprises a hinged rod hinged on the screw rod, a sliding sleeve used for switching the hinged rod to a locking state, and a connecting piece used for being installed on a valve rod of the valve, wherein one end of the hinged rod, corresponding to the connecting piece, is provided with a first arc surface, a hook body is arranged on the hinged rod and positioned on the first arc surface, a notch is formed in the hook body, in the locking state, the hinged rod and the screw rod are collinear, the hinged rod is fixed relative to the screw rod, one end, corresponding to the hinged rod, of the connecting piece is provided with a pin seat, a pin is fixedly installed on the pin seat, the end part of the pin seat is provided with a second arc surface, the pin is used for switching the connecting piece and the hinged rod to a connecting state, and in the connecting state, the hinged rod and the connecting piece are collinear, the notch on the hook body is buckled on the pin, and the first arc surface is propped against the second arc surface.

Furthermore, the circle center of the first arc surface is located on the pivot of the hinge rod, and the radius of the second arc surface is equal to that of the first arc surface.

Further, have the last straight wall and the lower straight wall that are parallel to each other in the opening, and go up straight wall with the straight wall all is mutually perpendicular with the axial lead of articulated mast down, still have the semicircle wall in the opening, the semicircle wall is tangent with last straight wall and lower straight wall.

Further, in the connection state, the pin is accommodated in the hook body and abuts against the semicircular wall.

Furthermore, the screw nut is rotatably mounted on the base body, the screw is mounted on the screw nut in a matching manner, and the screw is circumferentially limited on the base body.

Furthermore, at least one guide rod is fixedly arranged on the seat body along the axial direction of the seat body.

Furthermore, the straight stroke transmission device for the valve actuator further comprises a shaft, the shaft is used for hinging the hinged rod on the screw rod, a sliding block is fixedly arranged at the end part of the shaft corresponding to the guide rod, and the sliding block is connected to the guide rod in a sliding mode.

Furthermore, a step is arranged on the cylindrical surface of the screw rod, and a limiting flange is arranged on the cylindrical surface of the hinged rod.

Furthermore, the sliding sleeve is located between the step of the screw rod and the limiting flange of the hinge rod, and the inner wall of the sliding sleeve slides and abuts against the outer wall of the screw rod, or the outer wall of the screw rod and the outer wall of the hinge rod.

Further, the linear motion transmission device for the valve actuator further comprises an elastic member for providing an elastic force to move the sliding sleeve towards the hinge rod.

The invention has the beneficial effects that: when the straight stroke transmission device for the valve actuator is used, the valve actuator can be quickly connected with a valve in a transmission way by rotating the hinge rod and the connecting piece, when the valve actuator needs to be disassembled, the locking state of the hinge rod is released through the sliding sleeve, the connecting state of the connecting piece and the hinge rod can be released by rotating the hinge rod, the transmission connection relation of the valve actuator and the valve is quickly disconnected, and then the connection relation of the seat body and the valve actuator or the connection relation of the seat body and the valve is selectively disassembled according to actual requirements, so that the disassembling and assembling processes of the valve actuator and the valve are simplified by utilizing the device.

Drawings

The invention is further illustrated by the following figures and examples.

In the figure: FIG. 1 is a perspective view of a linear actuator for a valve actuator according to the present invention;

FIG. 2 is a cross-sectional view of the linear actuator for the valve actuator shown in FIG. 1;

FIG. 3 is an exploded view of the linear actuator of the present invention with the seat omitted;

FIG. 4 is a schematic view of the construction of the hinge rod of the linear actuator for a valve actuator according to the present invention;

FIG. 5 is a schematic structural view of the linear actuator for a valve actuator of the present invention, with one of the guide rods omitted;

fig. 6 is a schematic view of the linear actuator for a valve actuator of the present invention shown in fig. 5, and showing the hinge rod disconnected from the connecting rod.

100. A base body; 110. a guide bar; 200. a screw nut; 300. a screw; 310. a step; 320. a first hinge lug; 400. a hinged lever; 410. a second hinge lug; 420. a first arc surface; 430. a hook body; 431. opening the gap; 4311. an upper flat wall; 4312. a lower flat wall; 4313. a semicircular wall; 440. a limiting flange; 500. a sliding sleeve; 510. avoiding the mouth; 600. a connecting member; 610. a pin boss; 611. a second arc surface; 620. a pin; 700. a shaft; 710. a slider; 800. an elastic member.

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.

As shown in fig. 1, the present invention provides a linear motion transmission device for a valve actuator, which includes a base 100, a screw nut 200 rotatably installed on the base 100, and a screw 300 cooperatively installed on the screw nut 200, wherein the screw 300 is circumferentially limited on the base 100, when in use, the linear motion transmission device for the valve actuator is installed between the valve actuator and a valve, the screw nut 200 is used for being connected with an output end of the valve actuator, so as to drive the screw nut 200 to rotate, the screw 300 is connected with a valve stem of the valve, and the rotating screw nut 200 generates a thrust force through being in threaded fit with the screw 300, so as to drive the screw 300 to linearly move, thereby realizing control of the valve stem of the valve.

Further, the seat body 100 is substantially in a truncated cone-shaped structure, a cavity is formed in the center of the seat body 100 along the axial direction of the seat body 100, and a bearing for matching the screw nut 200 to rotate on the seat body 100 is installed in the cavity; at least one guide rod 110 is further installed on the seat body 100 along the axial direction of the seat body 100, the guide rod 110 is used for circumferentially limiting the screw 300 on the seat body 100 on one hand, and on the other hand, one end of the guide rod 110 far away from the seat body 100 is used for being connected with a valve body of a valve so as to stably connect the seat body 100 to the valve.

In the present embodiment, there are two guide rods 110, and the two guide rods 110 are symmetrically disposed on the seat body 100 along the axial line of the seat body 100. It will be appreciated that the guide bars 110 may also be arranged three, four, etc. parallel to each other.

Referring to fig. 2, the screw nut 200 is installed in a bearing in a cavity of the housing 100 so that the screw nut 200 is rotatably coupled to the housing 100.

In addition, in this embodiment, the end of the screw nut 200 is provided with a clutch claw structure corresponding to the output end of the valve actuator, and the clutch claw structure is used for being connected with the output end of the valve actuator in a matching manner so as to realize circumferential limit.

To facilitate disassembly, in one embodiment, the linear actuator for a valve actuator of the present invention further comprises a hinge rod 400, a sliding sleeve 500, and a connecting member 600.

Referring to fig. 3, the end of the screw 300, which is far away from the end of the threaded portion of the screw 300, is provided with a first hinge lug 310, the first hinge lug 310 has a first axial hole (not marked) along the radial direction of the screw 300, and a step 320 is provided on the cylindrical surface of the screw 300 and at a position close to the first hinge lug 310.

The hinge rod 400 is used for connecting the screw 300 with the connecting member 600, one end of the hinge rod 400 is hinged with one end of the screw 300, and more specifically, the end of the hinge rod 400 corresponding to one end of the screw 300 is provided with a second hinge lug 410, a second shaft hole (not marked in the figure) is formed in the second hinge lug 410 along the radial direction of the hinge rod 400, and the second hinge lug 410 is hinged with the first hinge lug 310 on the screw 300, in a specific embodiment, the straight stroke transmission device for the valve actuator of the present invention further comprises a shaft 700, the shaft 700 is used for hinging the hinge rod 400 to the screw 300, and the shaft 700 simultaneously passes through the first shaft hole in the first hinge lug 310 and the second shaft hole in the second hinge lug 410, so that the hinge rod 4001 is hinged to the screw 300.

In addition, the end of the shaft 700 is fixedly provided with a slider 710 corresponding to the guide rod 110, and the slider 710 is slidably connected to the guide rod 110, so that on one hand, circumferential limit of the screw 300 relative to the seat body 100 can be realized, and the screw 300 is limited to rotate relative to the seat body 100, so that when the screw nut 200 rotates, the screw 300 can be driven to do linear motion along the axial direction of the guide rod 110, and on the other hand, the movement of the screw 300 can be guided.

Referring also to fig. 4, an end of the hinge lever 400 at an end away from the second hinge lug 410 is provided with a first arc surface 420, and a center of the first arc surface 420 is located on a rotation fulcrum of the hinge lever 400.

As shown in fig. 4, in addition, the hinge rod 400 is provided with a hook 430 protruding from the first arc surface 420, more precisely, the hook 430 is located at a central position on the first arc surface 420, the hook 430 is provided with a gap 431 along the radial direction of the hinge rod 400, the gap 431 is provided with an upper straight wall 4311 and a lower straight wall 4312 which are parallel to each other, the upper straight wall 4311 and the lower straight wall 4312 are both perpendicular to the axial line of the hinge rod 400, the gap 431 is further provided with a semicircular wall 4313, and the semicircular wall 4313 is tangent to the upper straight wall 4311 and the lower straight wall 4312.

In addition, a limit flange 440 is provided on the cylindrical surface of the hinge lever 400.

The sliding sleeve 500 is located between the step 320 of the screw 300 and the stop flange 440 of the hinge lever 400, and the inner wall of the sliding sleeve 500 slides against the outer wall of the screw 300, or the screw 300 and the outer wall of the hinge lever 400, as shown in fig. 2, the sliding sleeve 500 serves to shift the hinge lever 400 to the locking state, in the locked state, the hinge rod 400 is in line with the screw 300, the sliding sleeve 500 abuts against the limit flange 440 of the hinge rod 400, and the hinge rod 400 is fixed with respect to the screw 300, more precisely, when the sliding sleeve 500 moves and disengages from the hinge lever 400, the hinge lever 400 can swing about the shaft 700 with respect to the screw 300 because it is not restricted by the sliding sleeve 500, when the hinge rod 400 is rotated to be collinear with the screw rod 300, the sliding sleeve 500 is simultaneously sleeved on the screw rod 300 and the hinge rod 400 by moving the sliding sleeve 500, so that the hinge lever 400 cannot swing with respect to the screw 300 and the hinge lever 400 is in a locked state.

And a avoidance opening 510 is formed on the sliding sleeve 500 corresponding to the shaft 700 to prevent the sliding sleeve 500 from being obstructed by the shaft 700 when moving on the screw 300.

In order to facilitate the movement of the sliding sleeve 500, in a specific embodiment, the linear stroke transmission device for a valve actuator of the present invention further includes an elastic member 800, wherein the elastic member 800 is used for providing an elastic force to move the sliding sleeve 500 towards the hinge rod 400, in this embodiment, the elastic member 800 is a spiral compression spring, the elastic member 800 is sleeved on the screw rod 300 in a compressed state, and two ends of the elastic member 800 respectively abut against the step 320 and the sliding sleeve 500, so that when the hinge rod 400 is collinear with the screw rod 300, the sliding sleeve 500 can automatically slide towards the hinge rod 400 due to the elastic thrust of the elastic member 800, so that the hinge rod 400 is switched to a locked state, and when the lock of the hinge rod 400 needs to be released, a force is applied to the sliding sleeve 500 to move the sliding sleeve 500 along the axial direction of the screw rod 300 and disengage from the hinge rod 400.

The connecting member 600 is used to be mounted on a valve rod of a valve, in this embodiment, a mounting hole is provided at one end of the connecting member 600 corresponding to the valve rod, and a threaded hole penetrating through the mounting hole is provided at a side surface of the connecting member 600, so that the connecting member 600 can be sleeved on the valve rod of the valve through the mounting hole, and the connecting member 600 is fixedly mounted on the valve rod by screwing a screw into the threaded hole on the connecting member 600.

The end of the connecting member 600 corresponding to one end of the hinge rod 400 is integrally provided with a pin seat 610, a pin 620 is fixedly mounted on the pin seat 610 along the radial direction of the connecting member 600, the end of the pin seat 610 is provided with a second arc surface 611, as shown in fig. 5, and the radius of the second arc surface 611 is equal to that of the first arc surface 420; the pin 620 is used for switching the connecting piece 600 and the hinge rod 400 to a connecting state, in the connecting state, the hinge rod 400 and the connecting piece 600 are collinear, the pin 620 is accommodated in the hook body 430 and abuts against the semicircular wall 4313, the first arc surface 420 of the hinge rod 400 abuts against the second arc surface 611 of the connecting piece 600, so that the connecting piece 600 is axially limited on the hinge rod 400, and when the screw rod 300 linearly moves along the axial output of the screw rod 300, the hinge rod 400 and the connecting piece 600 are driven to linearly reciprocate.

The operation of a linear actuator for a valve actuator according to the present invention is described below with reference to the accompanying drawings:

when the valve seat is used, the seat body 100 is fixedly connected with the corresponding valve actuator and the corresponding valve, the screw nut 200 is connected with the output end of the valve actuator, the connecting piece 600 is fixedly installed on the valve rod of the valve, the sliding sleeve 500 is moved to release the locking state of the hinge rod 400, the valve rod of the valve or the output end of the valve actuator is moved to enable the hinge rod 400 and the connecting piece 600 to be close to each other until the notch 431 on the hinge rod 400 is buckled into the pin 620 on the connecting piece 600, the hinge rod 400 is rotated to enable the notch 431 on the hinge rod 400 to be buckled onto the pin 620 until the connecting piece 600 and the hinge rod 400 enter the connecting state, at the moment, the sliding sleeve 500 enables the hinge rod 400 to enter the locking state under the elastic force of the elastic piece 800, and on one hand, the first arc surface 420 of the hinge rod 400 is abutted against the second arc surface 611 of the connecting piece 600, so as to play a role of radial limit on the connecting piece 600, on the other hand, when the valve rod of the straight stroke valve (such as a gate valve) is extended, the resistance is small, and the existence of the pressure of fluid medium in the valve is more beneficial to the extension of the valve, so that when the valve rod is extended, the pulling force of the hook body 430 on the pin 620 on the connecting piece 600 is not enough to cause the pin 620 or the hook body 430 to be overloaded and damage the pin 620 or the hook body 430, when the valve rod of the valve is retracted, the valve rod needs to resist the larger pressure in the valve, for the straight stroke transmission device for the valve actuator of the present invention, when the valve rod is moved, the main stress is concentrated between the first arc surface 420 of the hinged rod 400 and the second arc surface 611 of the connecting piece 600, the load of the pin 620 and the hook body 430 is small, so that the structural design of the present invention is reasonable, has reliable service life.

When the valve actuator and the valve need to be disassembled, referring to fig. 6, only the sliding sleeve 500 needs to be moved to release the locking state of the hinge rod 400, and then the hinge rod 400 is rotated to separate the hook 430 from the pin 620 on the connecting member 600, and finally, the connection relationship between the seat body 100 and the valve actuator or the connection relationship between the seat body 100 and the valve can be selectively disassembled as required.

Therefore, the straight stroke transmission device for the valve actuator has at least the following beneficial effects:

when the straight stroke transmission device for the valve actuator is used, the valve actuator can be quickly connected with a valve in a transmission way by rotating the hinge rod 400 to be connected with the connecting piece 600, when the straight stroke transmission device needs to be disassembled, the locking state of the hinge rod 400 is released through the sliding sleeve 500, the connecting state of the connecting piece 600 and the hinge rod 400 can be released through rotating the hinge rod 400, the transmission connection relation between the valve actuator and the valve is quickly disconnected, and then the connection relation between the seat body 100 and the valve actuator or the connection relation between the seat body 100 and the valve is selectively disassembled according to actual requirements, so that the disassembling and assembling processes of the valve actuator and the valve are simplified by utilizing the device.

In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides a straight stroke transmission for valve actuator, includes pedestal, screw nut and screw rod, its characterized in that: the straight stroke transmission device for the valve actuator further comprises a hinged rod hinged on the screw rod, a sliding sleeve used for switching the hinged rod to a locking state, and a connecting piece used for being installed on a valve rod of the valve, wherein one end of the hinged rod, corresponding to the connecting piece, is provided with a first arc surface, a hook body is arranged on the hinged rod and positioned on the first arc surface, a notch is formed in the hook body, in the locking state, the hinged rod and the screw rod are collinear, the hinged rod is fixed relative to the screw rod, one end, corresponding to the hinged rod, of the connecting piece is provided with a pin seat, a pin is fixedly installed on the pin seat, the end part of the pin seat is provided with a second arc surface, the pin is used for switching the connecting piece and the hinged rod to a connecting state, and in the connecting state, the hinged rod and the connecting piece are collinear, the notch on the hook body is buckled on the pin, and the first arc surface is propped against the second arc surface.

2. A linear actuator for a valve actuator as defined in claim 1, wherein: the circle center of the first arc surface is located on the rotating fulcrum of the hinge rod, and the radius of the second arc surface is equal to that of the first arc surface.

3. A linear actuator for a valve actuator as defined in claim 1, wherein: have the last straight wall and the lower straight wall that are parallel to each other in the opening, and go up straight wall with down straight wall all with the axial lead of hinge bar is mutually perpendicular, still have the semicircle wall in the opening, the semicircle wall is tangent with last straight wall and lower straight wall.

4. A linear actuator for a valve actuator as defined in claim 3, wherein: in the connected state, the pin is accommodated in the hook body and abuts against the semicircular wall.

5. A linear actuator for a valve actuator as defined in claim 1, wherein: the screw nut is rotatably installed on the seat body, the screw is installed on the screw nut in a matched mode, and the screw is limited on the seat body in the circumferential direction.

6. A linear actuator for a valve actuator as defined in claim 5, wherein: at least one guide rod is fixedly arranged on the seat body along the axial direction of the seat body.

7. A linear actuator for a valve actuator as defined in claim 6, wherein: the straight stroke transmission device for the valve actuator further comprises a shaft, the shaft is used for hinging the hinged rod to the screw rod, a sliding block is fixedly arranged at the end part of the shaft corresponding to the guide rod, and the sliding block is connected to the guide rod in a sliding mode.

8. A linear actuator for a valve actuator as defined in claim 1, wherein: the cylindrical surface of the screw rod is provided with a step, and the cylindrical surface of the hinged rod is provided with a limiting flange.

9. A linear actuator for a valve actuator as defined in claim 8, wherein: the sliding sleeve is located between the ladder of screw rod and the limit flange of articulated mast, and the inner wall of sliding sleeve slides and supports and hold on the outer wall of screw rod, or the screw rod with on the outer wall of articulated mast.

10. A linear actuator for a valve actuator as defined in claim 9, wherein: the linear actuator for a valve actuator further includes a resilient member for providing a resilient force to move the sliding sleeve toward the hinge rod.