CN116989026A - Actuating mechanism - Google Patents

Abstract

The application provides an actuating mechanism, which comprises an upper cylinder body and a lower cylinder body, wherein the upper cylinder body and the lower cylinder body form a movable space, a piston is arranged in the movable space, the piston can slide along the inner wall of the upper cylinder body, a push rod is arranged on the piston, one end of the push rod extends out of the lower cylinder body and is provided with a connecting seat, a mounting hole for a valve rod of the push rod and a valve to extend in is formed in the connecting seat, the mounting hole comprises a first hole section, a second hole section and a third hole section which are sequentially arranged along the same axis, the diameters of the first hole section and the third hole section are the same, the diameters of the second hole section are larger than those of the first hole section, a connector matched with the first hole section and the second hole section in shape is arranged on the push rod, the connector is in clearance fit with the inner wall of the mounting hole, and the valve rod is detachably arranged in the third hole section. This scheme can effectually improve the axiality of push rod and valve rod, guarantees sealing performance.

Description

Actuating mechanism

Technical Field

The application belongs to the technical field of valve control, and particularly relates to an actuating mechanism.

Background

At present, an actuating mechanism for controlling valve action comprises a cylinder body, a piston, a push rod and the like, wherein the piston is arranged in the cylinder body, one end of the push rod is fixed with the piston, the other end of the push rod penetrates out of the cylinder body and then is connected with a valve rod of the valve, and the piston action drives the push rod to act so as to drive the valve to execute opening and closing actions. However, when the push rod is connected with the valve rod, if the push rod is not coaxial with the valve rod in the processing or assembling process, the force generated by the different axes can be fed back to the piston and the cylinder body of the actuating mechanism after the connection, so that the stress on a certain position in the circumferential direction of the O-shaped ring on the piston is larger, and the sealing performance is poor after the O-shaped ring is severely worn.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present application is to provide an actuator for solving the problems of the prior art and the like.

To achieve the above object and other related objects, the present application provides an actuator, including an upper cylinder and a lower cylinder, where the upper cylinder and the lower cylinder form a movable space, a piston is disposed in the movable space, the piston can slide along an inner wall of the upper cylinder, a push rod is mounted on the piston, one end of the push rod extends out of the lower cylinder and is provided with a connecting seat, the connecting seat is provided with a mounting hole into which a valve rod of the push rod and the valve extends, the mounting hole includes a first hole section, a second hole section and a third hole section which are sequentially disposed along the same axis, the diameters of the first hole section and the third hole Duan Zhijing are the same, the diameters of the second hole section are larger than those of the first hole section, a connector with a shape matched with those of the first hole section and the second hole section is disposed on the push rod, the connector is in clearance fit with an inner wall of the mounting hole, and the valve rod is detachably mounted in the third hole section.

Optionally, the connecting seat comprises a first seat body and a second seat body, half holes are formed in the first seat body and the second seat body, and the half holes are formed in the first seat body and the second seat body after the first seat body and the second seat body are assembled.

Optionally, be provided with on the push rod and be used for carrying out spacing ladder and the spacing subassembly that is used for carrying out spacing to the first side of piston to the second side of piston, the first side of piston with the second side is the opposite both sides of piston, the piston is installed spacing ladder with spacing subassembly is between.

Optionally, the push rod includes a body and a mating section at one end of the body, and the connector is located at one end of the body away from the mating section; the diameter of the matching section is smaller than that of the body, so that the connecting part of the matching section and the body forms the limit step.

Optionally, from the direction of the first side to the second side of the piston, a first ring groove and a second ring groove are sequentially formed in the matching section, the limiting assembly comprises a clamping ring, a pressing ring and a limiting ring, the limiting ring is installed in the second ring groove, and the limiting ring is used for pressing the first side of the piston; the pressing ring is arranged between the limiting ring and the clamping ring, and the pressing ring presses the limiting ring; the clamping ring is arranged in the first annular groove and used for limiting the pressing ring.

Optionally, a third annular groove is further formed in the matching section, a first sealing ring is installed in the third annular groove, and the first sealing ring is located between the push rod and the piston.

Optionally, an oil-free lubrication bearing and at least two second sealing rings are arranged between the lower cylinder body and the push rod, and lubricating grease is arranged between two adjacent second sealing rings.

Optionally, a dust cover is arranged between one side of the lower cylinder body, which is far away from the second side of the piston, and the push rod.

Optionally, at least two third sealing rings are arranged between the piston and the upper cylinder body, a guide belt is arranged between two adjacent third sealing rings, and lubricating grease is arranged between two adjacent sealing rings.

Optionally, a return spring for piston return is arranged between the first side of the piston and the inner wall of the lower cylinder body.

As described above, the actuator of the application has the following beneficial effects:

in this scheme, the connector of push rod and the mounting hole clearance fit of connecting seat to solve the valve rod that causes in assembly or the course of working and the not coaxial problem of push rod, thereby guarantee the sealing washer between push rod and the piston can automatic centering, and the atress is even, and then guarantees the sealing performance of sealing washer. Because the upper cylinder body and the lower cylinder body form the movable space, compared with the movable space formed by the cylinder cover, the upper cylinder body and the lower cylinder body in the prior art, the application is equivalent to integrally forming the cylinder cover and the upper cylinder body in the prior art, and ensures that the coaxiality of the upper cylinder body, the lower cylinder body, the piston, the push rod and the valve rod is easier to ensure by processing the working step surface of the movable space at one time and the like, and the processing requirement is low.

Drawings

FIG. 1 is a schematic view, partially in section, of an actuator in accordance with an embodiment of the present application.

FIG. 2 is a schematic cross-sectional view of an actuator in accordance with an embodiment of the present application.

Fig. 3 is an enlarged view at a in fig. 2.

Fig. 4 is an enlarged view at B in fig. 2.

Fig. 5 is an enlarged view at C in fig. 2.

Fig. 6 is a schematic structural diagram of a connection seat according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a first base according to an embodiment of the application.

Fig. 8 is a schematic structural diagram of a push rod according to an embodiment of the present application.

Detailed Description

Reference numerals in the drawings of the specification include: the upper cylinder body 1, the first channel 101, the lower cylinder body 2, the second channel 201, the piston 3, the push rod 4, the body 401, the connector 402, the matching section 403, the first ring groove 4031, the second ring groove 4032, the third ring groove 4033, the limit step 4034, the connecting seat 5, the first seat 510, the second seat 520, the mounting hole 530, the first hole section 5301, the second hole section 5302, the third hole section 5303, the stroke pointer 6, the stroke scale plate 7, the return spring 8, the bolt 9, the fourth seal ring 10, the limit assembly 11, the collar 111, the pressing ring 112, the limit ring 113, the first seal ring 12, the bearing 13, the second seal ring 14, the grease 15, the dust cover 16, the third seal ring 17, and the guide belt 18.

Further advantages and effects of the present application will become apparent to those skilled in the art from the disclosure of the present application, which is described by the following specific examples.

In an exemplary embodiment of the present application, an actuator is provided, with particular reference to fig. 1-8.

As shown in fig. 1 to 8, in an exemplary embodiment of the present application, the actuating mechanism includes an upper cylinder 1 and a lower cylinder 2, the upper cylinder 1 and the lower cylinder 2 form a movable space, a piston 3 is disposed in the movable space, the piston 3 can slide along an inner wall of the upper cylinder 1, a push rod 4 is mounted on the piston 3, one end of the push rod 4 extends out of the lower cylinder 2 and is provided with a connecting seat 5, a mounting hole 530 into which a valve rod of the push rod 4 and the valve extend is formed in the connecting seat 5, the mounting hole 530 includes a first hole section 5301, a second hole section 5302 and a third hole section 5303 which are sequentially disposed along the same axis, the diameters of the first hole section 5301 and the third hole section 5303 are the same, the diameter of the second hole section 5302 is larger than the diameter of the first hole section 5301, a connector 402 having a shape matched with the first hole section 5301 and the second hole section 5302 is disposed on the push rod 4, the connector 402 is in clearance fit with an inner wall of the mounting hole 530, and the valve rod is detachably mounted in the third hole section 5303.

In this embodiment, the connector 402 of the push rod 4 is in clearance fit with the mounting hole 530 of the connecting seat 5, so as to solve the problem that the valve rod and the push rod 4 are not coaxial in the assembly or processing process, thereby ensuring that the sealing ring between the push rod 4 and the piston 3 can be automatically centered, and the stress is even, and further ensuring the sealing performance of the sealing ring. Because the upper cylinder body 1 and the lower cylinder body 2 form a movable space, compared with the movable space formed by the cylinder cover, the upper cylinder body 1 and the lower cylinder body 2 in the prior art, the application is equivalent to integrally forming the cylinder cover and the upper cylinder body 1 in the prior art, and the coaxiality of the upper cylinder body 1, the lower cylinder body 2, the piston 3, the push rod 4 and the valve rod is easier to ensure by processing the working step surface of the movable space at one time, and the like, and the processing requirement is low.

Illustratively, the valve stem is threadably engaged with the third bore segment 5303.

In an exemplary embodiment, the connection seat 5 includes a first seat body 510 and a second seat body 520, and half holes are formed in the first seat body 510 and the second seat body 520, and the half holes form the mounting hole 530 after the first seat body 510 and the second seat body 520 are assembled.

It should be noted that, in order to facilitate the disassembly and assembly of the push rod 4 on the connection seat 5, the first seat 510 and the second seat 520 are provided, and when the first seat 510 and the second seat 520 are separated, the push rod 4 may be put into the half hole or taken out from the half hole.

Illustratively, the first and second housings 510 and 520 are fixed by screws.

For example, the first seat 510 or the second seat 520 may further be provided with an adjusting hole, the adjusting hole is perpendicular to the mounting hole 530, an adjusting member is disposed in the adjusting hole, the adjusting member is in threaded connection with the adjusting hole, and the adjusting member is rotated to abut against the connector 402, so as to adjust the position of the connector 402 in the mounting hole 530.

Illustratively, the first seat 510 or the second seat 520 is provided with a travel pointer 6, the lower cylinder 2 is provided with a travel scale 7, and the tip of the travel pointer 6 points to the travel scale 7, so as to read the travel of the push rod 4.

In an exemplary embodiment, the push rod 4 is provided with a limiting step 4034 for limiting the second side of the piston 3 and a limiting assembly 11 for limiting the first side of the piston 3, the first side and the second side of the piston 3 being opposite sides of the piston 3, the piston 3 being mounted between the limiting step 4034 and the limiting assembly 11.

In this embodiment, the piston 3 is limited by the limiting step 4034 and the limiting assembly 11, so as to prevent the piston 3 from moving axially along the push rod 4.

In an exemplary embodiment, the push rod 4 includes a body 401 and a mating section 403 at one end of the body 401, and the connector 402 is located at an end of the body 401 remote from the mating section 403; the diameter of the mating section 403 is smaller than the diameter of the body 401, so that the connection part of the mating section 403 and the body 401 forms a limit step 4034.

In this embodiment, the diameter of the mating section 403 is set smaller than the diameter of the body 401, so that the connection part between the two forms a limit step 4034, so as to limit the piston 3.

In an exemplary embodiment, from the first side to the second side of the piston 3, the matching section 403 is sequentially provided with a first ring groove 4031 and a second ring groove 4032, the limit assembly 11 includes a collar 111, a pressing ring 112 and a limit ring 113, the limit ring 113 is installed in the second ring groove 4032, and the limit ring 113 is used for pressing the first side of the piston 3; the pressing ring 112 is arranged between the limiting ring 113 and the clamping ring 111, and the pressing ring 112 presses the limiting ring 113; the collar 111 is disposed in the first ring groove 4031, and the collar 111 is used for limiting the pressing ring 112.

In this embodiment, the first ring groove 4031 and the second ring groove 4032 are formed on the push rod 4, so as to realize the embedded installation of the collar 111 and the stop ring 113, and prevent the collar 111 and the stop ring 113 from moving along the axial direction of the push rod 4. And the retainer ring 111, the pressing ring 112 and the limiting ring 113 limit the piston 3, compared with the prior art in which the nut is limited by the nut, the problem that the nut is easy to fall off from the valve rod is solved.

Illustratively, the stop collar 113 is a split ring.

In an exemplary embodiment, the matching section 403 is further provided with a third ring groove 4033, and the first sealing ring 12 is installed in the third ring groove 4033, and the first sealing ring 12 is located between the push rod 4 and the piston 3.

It is worth noting that the first sealing ring 12 is provided to seal between the push rod 4 and the piston 3.

In an exemplary embodiment, an oil-free bearing 13 and at least two second sealing rings 14 are arranged between the lower cylinder 2 and the push rod 4, and a grease 15 is arranged between two adjacent second sealing rings 14.

In this embodiment, the second sealing ring 14 is arranged to realize sealing between the lower cylinder 2 and the push rod 4, and the grease 15 is arranged to lubricate the second sealing ring 14, so as to reduce abrasion of the sealing ring and prolong the service life of the second sealing ring 14.

Illustratively, to meet the operational environment of the valve, a high temperature grease 15 is employed. The bearing 13 is an oil-free lubrication bearing 13.

In an exemplary embodiment, a dust boot 16 is provided between the side of the lower cylinder 2 remote from the second side of the piston 3 and the push rod 4.

It should be noted that the dust cover 16 is provided to prevent dust, sand and other foreign matters from entering the installation place of the second sealing ring 14 to cause sealing failure.

Illustratively, a mounting protrusion is provided on the lower cylinder 2 toward the direction of the connecting seat 5, a first annular mounting groove for mounting the dust cover 16 is provided on the mounting protrusion, and one end of the dust cover 16 connected with the lower cylinder 2 is sleeved in the first annular mounting groove.

Illustratively, the body 401 is provided with a second annular mounting groove for limiting the dust cover 16, and one end of the dust cover 16 connected with the push rod 4 is mounted in the second annular mounting groove.

Illustratively, the dust boot 16 is of resilient material to accommodate the movement of the push rod 4.

In an exemplary embodiment, at least two third sealing rings 17 are arranged between the piston 3 and the upper cylinder 1, a guiding belt 18 is arranged between two adjacent third sealing rings 17, and grease 15 is arranged between two adjacent sealing rings.

In this embodiment, grease 15 provides lubrication for third seal ring 17 and guide belt 18 to increase service life. The guiding belt 18 is arranged to guide the movement of the piston 3.

Illustratively, the piston 3 is provided with a first mounting groove for mounting the third sealing ring 17 and the guiding belt 18, and a second mounting groove for lubricating grease 15 is provided between the guiding belt 18 and the third sealing ring 17, and lubrication of the guiding belt 18 and the third sealing ring 17 is realized by providing the lubricating grease 15.

Illustratively, to accommodate the valve environment of use, a high temperature grease 15 is employed.

In an exemplary embodiment, a return spring 8 for return of the piston 3 is arranged between the first side of the piston 3 and the inner wall of the lower cylinder 2.

It is worth to say that, setting up of reset spring 8 guarantees that when on-the-spot outage, can guarantee that the valve is in the closed condition through reset spring 8's elastic force, and then guarantees on-the-spot safety.

In an exemplary embodiment, the piston 3 divides the movable space into a first chamber and a second chamber, the second chamber being located at the lower cylinder 2 side. The upper cylinder 1 is provided with a first channel 101 for gas inlet and outlet of the first cavity, and the lower cylinder 2 is provided with a second channel 201 for gas inlet and outlet of the second cavity. The upper cylinder body 1 and the lower cylinder body 2 are connected through the bolt 9, and the length design of the bolt 9 is enough to ensure that the elastic force of the return spring 8 is discharged, so that the return spring 8 is prevented from being popped up and accidentally injured.

Illustratively, in order to achieve sealing between the upper cylinder 1 and the lower cylinder 2, the lower cylinder 2 is provided with a protrusion extending into the upper cylinder 1, and a fourth sealing ring 10 is provided between the protrusion and the upper cylinder 1.

Illustratively, the first seal ring 12, the second seal ring 14, the third seal ring 17, and the fourth seal ring 10 are O-rings.

The above embodiments are merely illustrative of the principles of the present application and its effectiveness, and are not intended to limit the application. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the application. Accordingly, it is intended that all equivalent modifications and variations of the application be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. The utility model provides an actuating mechanism, its characterized in that includes cylinder body and lower cylinder body, go up the cylinder body with lower cylinder body constitutes the activity space, be provided with the piston in the activity space, the piston can be followed go up the cylinder body inner wall slip, install the push rod on the piston, the one end of push rod stretches out be provided with the connecting seat behind the lower cylinder body, set up on the connecting seat and supply the mounting hole that the valve rod of push rod and valve stretches into, the mounting hole includes first hole section, second hole section and the third hole section that set gradually along same axis, first hole section is the same with third hole Duan Zhijing, second hole section diameter is greater than first hole section diameter, be provided with the shape on the push rod with the connector that first hole section and second hole section match, the connector with clearance fit between the inner wall of mounting hole, valve rod detachably installs in the third hole section.

2. The actuator of claim 1, wherein the connector comprises a first housing and a second housing, wherein the first housing and the second housing are each provided with a half hole, and the half holes form the mounting holes after the first housing and the second housing are assembled.

3. The actuator of claim 1, wherein the push rod is provided with a limiting step for limiting a second side of the piston and a limiting assembly for limiting a first side of the piston, the first side and the second side of the piston being opposite sides of the piston, the piston being mounted between the limiting step and the limiting assembly.

4. The actuator of claim 3 wherein the pushrod comprises a body and a mating segment at an end of the body, the connector being at an end of the body remote from the mating segment; the diameter of the matching section is smaller than that of the body, so that the connecting part of the matching section and the body forms the limit step.

5. The actuator of claim 4, wherein a first ring groove and a second ring groove are sequentially formed in the matching section from the first side to the second side of the piston, the limiting assembly comprises a clamping ring, a pressing ring and a limiting ring, the limiting ring is installed in the second ring groove, and the limiting ring is used for pressing the first side of the piston; the pressing ring is arranged between the limiting ring and the clamping ring, and the pressing ring presses the limiting ring; the clamping ring is arranged in the first annular groove and used for limiting the pressing ring.

6. The actuator of claim 5, wherein the mating segment further defines a third ring groove, and wherein a first seal ring is disposed in the third ring groove, the first seal ring being disposed between the pushrod and the piston.

7. The actuator of claim 1, wherein an oil-free bearing and at least two second seal rings are disposed between the lower cylinder and the pushrod, and grease is disposed between two adjacent second seal rings.

8. The actuator of claim 1, wherein a dust boot is disposed between the pushrod and a side of the lower cylinder remote from the second side of the piston.

9. The actuator of claim 1, wherein at least two third sealing rings are provided between the piston and the upper cylinder, a guide belt is provided between two adjacent third sealing rings, and grease is provided between two adjacent sealing rings.

10. The actuator of claim 1, wherein a return spring for piston return is disposed between the first side of the piston and the inner wall of the lower cylinder.