CN117588585A - Trip mechanism of cut-off valve - Google Patents
Trip mechanism of cut-off valve Download PDFInfo
- Publication number
- CN117588585A CN117588585A CN202410081050.0A CN202410081050A CN117588585A CN 117588585 A CN117588585 A CN 117588585A CN 202410081050 A CN202410081050 A CN 202410081050A CN 117588585 A CN117588585 A CN 117588585A
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- rotation stopping
- rotation
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- ball
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- 230000007246 mechanism Effects 0.000 title claims abstract description 28
- 238000004891 communication Methods 0.000 claims abstract description 33
- 230000000670 limiting effect Effects 0.000 claims abstract description 28
- 230000000149 penetrating effect Effects 0.000 claims abstract description 8
- 230000007704 transition Effects 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 2
- 230000009471 action Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000013011 mating Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000009955 peripheral mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Taps Or Cocks (AREA)
Abstract
The invention provides a trip mechanism of a shut-off valve, which comprises a shell, a rotation stopping shaft, a rotation stopping ball and a rotation stopping spring. The shell is provided with a valve core through hole penetrating through the valve core shaft and a rotation stopping through hole penetrating through the rotation stopping shaft. A communication hole for communicating the valve core through hole and the rotation stopping through hole is arranged between the valve core through hole and the rotation stopping through hole. The rotation stopping ball is arranged on the communication hole. The outer wall of the valve core shaft is provided with a limiting pit in cooperation with the communication hole. The surface of the rotation stopping shaft is provided with a rotation stopping protrusion in a protruding way by matching with the rotation stopping ball. The rotation stopping spring is matched with the rotation stopping shaft. The anti-rotation protrusion is matched with the anti-rotation ball and is provided with a contact surface, so that when the anti-rotation ball is matched with the contact surface, the anti-rotation ball is pushed into the limiting pit. The contact surface is parallel to the cylindrical surface of the outer wall of the stop shaft. The matching part of the rotation stopping bulge and the rotation stopping ball is in a plane shape. The contact surface has a wider width along the length of the stopper shaft. During assembly, the rotation stopping shaft does not need to be accurately adjusted along the axial direction, and the assembly difficulty is greatly reduced as long as the rotation stopping ball is guaranteed to be abutted to the contact surface.
Description
Technical Field
The invention relates to the technical field of shut-off valves, in particular to a trip mechanism of a shut-off valve.
Background
The cut-off valve is used for automatically closing the valve when the rear end of the cut-off valve is overpressurized, so that the pipeline is cut off, and the damage caused by the high pressure at the rear end is avoided. And the tripping mechanism is an important component of the self-operated shut-off valve. And when the pressure exceeds the preset pressure, the cutting mechanism acts to cut off the cutting valve. A prior art shut-off valve structure is shown in fig. 1. Based on the direction of the illustration, when the rear end of the valve is overpressured, the electric or mechanical actuating mechanism pushes the right end of the stopping shaft leftwards, so that the stopping shaft leftwards moves. And then the rotation stopping protrusion of the rotation stopping shaft moves leftwards and leaves the rotation stopping ball, and then the rotation stopping ball can move downwards and separate from the limiting pit of the valve core shaft. The valve core shaft can freely rotate without the limit of the rotation stopping ball. Because the valve core shaft is preset with torque, the valve core shaft can rotate and cut off the valve once the limit of the anti-rotation ball is lost.
This structure has the following disadvantages: because the surface of the rotation stopping protrusion is an arc surface, the rotation stopping protrusion and the rotation stopping ball can push the rotation stopping ball to be tightly fixed in the limit pit only under the matching condition shown in fig. 1. If the anti-rotation protrusion is slightly left or right, the anti-rotation ball is slightly downward, so that the amount of the anti-rotation ball positioned in the limiting pit is relatively small, and the limiting effect on the valve core shaft is reduced. Therefore, the position relationship between the limiting protrusion and the limiting ball is required to be ensured during assembly, and the assembly difficulty is high. In addition, the anti-rotation ball or the anti-rotation protrusion forms a pit due to the long-time cooperation of the anti-rotation ball and the anti-rotation protrusion. The optimal matching point of the rotation stopping ball and the rotation stopping bulge is only one point, and once the pit is formed, the effect is affected, and the rotation stopping shaft needs to be replaced.
Disclosure of Invention
The invention aims to provide a trip mechanism of a cut-off valve, which can solve the technical problems of unstable effect caused by high assembly difficulty and easy pit formation of the trip mechanism in the prior art.
The embodiment of the invention is realized by the following technical scheme:
a trip mechanism of a cut-off valve comprises a shell, a rotation stopping shaft, a rotation stopping ball and a rotation stopping spring; the shell is provided with a valve core through hole penetrating through the valve core shaft and a rotation stopping through hole penetrating through the rotation stopping shaft; a communication hole for communicating the valve core through hole and the rotation stopping through hole is arranged between the valve core through hole and the rotation stopping through hole; the rotation stopping ball is arranged on the communication hole; the outer wall of the valve core shaft is provided with a limiting pit in cooperation with the communication hole, so that the anti-rotation ball can enter the limiting pit through the communication hole; the surface of the rotation stopping shaft is provided with a rotation stopping protrusion in a protruding mode by matching with the rotation stopping ball, so that the rotation stopping ball is pushed to the limiting pit when the rotation stopping protrusion is positioned in the communication hole; the rotation stopping spring is matched with the rotation stopping shaft, so that the rotation stopping spring can push the rotation stopping protrusion to move to the communication hole; the anti-rotation protrusion is matched with the anti-rotation ball to be provided with a contact surface, so that when the anti-rotation ball is matched with the contact surface, the anti-rotation ball is pushed into the limit pit; the contact surface is parallel to the cylindrical surface of the outer wall of the stop shaft.
Further, the rotation stopping protrusion is arranged in a cylindrical shape around the rotation stopping shaft, so that the contact surface is a cylindrical surface; one side of the rotation stopping bulge is provided with a truncated cone-shaped transition section; the outer diameter of the large-diameter end of the transition section is the same as that of the rotation stopping protrusion; the outer diameter of the small-diameter end of the transition section is the same as the outer diameter of the stop shaft.
Further, the outer wall of the stop shaft is provided with a guide protrusion; the inner wall of the rotation stopping through hole is provided with a guide groove along the circumferential direction of the rotation stopping through hole, which is matched with the guide protrusion; the guide groove comprises an inclined section, a parallel section and a guide section; the parallel section is parallel to the length direction of the rotation stopping through hole; the inclined section is inclined to the length direction of the rotation stopping through hole; the inclined section and the parallel section are provided with a plurality of sections; the inclined sections and the parallel sections are alternately distributed along the circumferential direction of the inner wall of the rotation stopping through hole, and the inclined sections and the parallel sections are connected end to end in sequence to form a closed ring groove; the inclined section and the parallel section are connected through the guide section; the guide section is obliquely arranged so that the guide protrusions move in the same direction in the annular groove.
Further, a guide pipe is arranged in the rotation stopping through hole; the guide groove is arranged on the inner wall of the guide tube.
Further, the outer wall of the guide tube is provided with a screw hole; the hole wall of the rotation stopping through hole is provided with a strip-shaped through hole in cooperation with the screw hole of the guide pipe; the strip-shaped through holes are arranged along the circumferential direction of the rotation stopping through holes; the screw hole is provided with a locking screw in a matched mode; the locking screw is connected with the screw hole of the guide tube through the strip-shaped through hole.
Further, an annular groove is formed in the side face of one side, away from the transition section, of the rotation stopping protrusion; the axis of the rotation stopping shaft passes through the center of the annular groove; a rotating ring is arranged in the annular groove; the anti-rotation spring is tightly propped against the rotating ring.
Further, the guide tube comprises a guide part and a limit part which are connected with each other; the aperture of the limiting part is smaller than that of the guiding part.
Further, sealing caps and the guide pipes are respectively arranged at two ends of the rotation stopping through holes; the sealing cap is in threaded connection with the tail end of the rotation stopping through hole; the anti-rotation spring is tightly propped between the sealing cap and the rotating ring.
Further, the stop shaft is perpendicular to the spool shaft.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:
when the trip mechanism of the cut-off valve is used, if the rear end of the cut-off valve is overpressured, the electric or mechanical actuating mechanism pushes the rotation stopping shaft, so that the rotation stopping protrusion arranged on the rotation stopping shaft moves along with the rotation stopping shaft to leave the rotation stopping ball. After the rotation stopping ball loses the blocking of the rotation stopping protrusion, the rotation stopping ball can move freely along the communication hole. This also causes the torsion force of the spool shaft to push the detent ball free to move along the communication hole away from the detent pit. The valve core shaft can freely rotate after losing the limit of the rotation stopping ball, so that the valve core shaft rotates under the action of torsion to cut off the valve. Thereby avoiding the damage to equipment at the back of the cut-off valve caused by the continuous communication of the front and the back of the cut-off valve. When the valve is reset, an external force is applied to enable the valve core shaft to rotate, and then the limiting pit is aligned with the communication hole. The rotation stopping shaft can be reset under the action of the rotation stopping spring, and the rotation stopping protrusion is moved to the position where the communication hole is located. The rotation stopping protrusion can push the rotation stopping ball into the limiting pit, so as to limit the valve core shaft.
The anti-rotation protrusion is matched with the anti-rotation ball and is provided with a contact surface which is parallel to the cylindrical surface of the outer wall of the anti-rotation shaft. This makes the mating part of the rotation stopping protrusion and the rotation stopping ball planar. The contact surface has a wider width along the length of the stopper shaft. During assembly, the rotation stopping shaft does not need to be accurately adjusted along the axial direction, and the assembly difficulty is greatly reduced as long as the rotation stopping ball is guaranteed to be abutted to the contact surface. In addition, as the contact surface between the contact surface and the anti-rotation ball increases, the stress surface increases, and the contact surface is difficult to form pits. And then guarantee to stop the protruding limit pit that can effectually push into with the ball that stops to rotate, and then guaranteed to stop the cooperation compactness in ball and limit pit, guarantee to stop the restriction effect of ball to the case axle.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a trip mechanism of a trip valve provided in the prior art;
fig. 2 is a schematic structural view of a trip mechanism of a trip valve provided by the present invention;
FIG. 3 is a schematic view of a guide slot;
FIG. 4 is a schematic view of a set screw and a bar channel;
FIG. 5 is a schematic structural view of a turning protrusion;
FIG. 6 is a schematic diagram showing the cooperation between the rotating shaft and the peripheral mechanism.
Icon: the sealing cap comprises a 1-shell, a 2-rotation stopping shaft, a 3-rotation stopping ball, a 4-rotation stopping spring, a 5-communication hole, a 6-valve core shaft, a 7-limiting pit, an 8-rotation stopping bulge, a 9-contact surface, a 10-transition section, an 11-guiding bulge, a 12-inclined section, a 13-parallel section, a 14-guiding section, a 15-guiding pipe, a 16-strip-shaped through hole, a 17-locking screw, a 18-rotating ring, a 19-guiding part, a 20-limiting part and a 21-sealing cap.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Examples:
as shown in fig. 2-6, the invention provides a trip mechanism of a cut-off valve, which comprises a shell 1, a rotation stopping shaft 2, a rotation stopping ball 3 and a rotation stopping spring 4. The tripping mechanism is matched with the valve body of the cut-off valve for use. The valve body is controlled to be switched on and off by the rotation of the valve core. The rotating shaft of the valve core is named as a valve core shaft 6. The shell 1 is provided with a valve core through hole penetrating through the valve core shaft 6 and a rotation stopping through hole penetrating through the rotation stopping shaft 2. The valve core shaft 6 can freely rotate in the valve core through hole; the rotation stopping shaft 2 can slide along the rotation stopping through hole. The valve core through hole and the rotation stopping through hole are mutually perpendicular, so that the rotation stopping shaft 2 is perpendicular to the valve core shaft 6. A communication hole 5 for communicating the valve core through hole and the rotation stopping through hole is arranged between the valve core through hole and the rotation stopping through hole.
The rotation stopping ball 3 is provided to the communication hole 5 such that the rotation stopping ball 3 can move along the communication hole 5. The outer wall of the valve core shaft 6 is provided with a limiting pit 7 in cooperation with the communication hole 5 so that the rotation stopping ball 3 can enter the limiting pit 7 through the communication hole 5. The surface of the rotation stopping shaft 2 is provided with a rotation stopping protrusion 8 in a protruding mode by matching with the rotation stopping ball 3, so that the rotation stopping protrusion 8 pushes the rotation stopping ball 3 to the limiting pit 7 when being positioned in the communication hole 5. One end of the rotation stopping spring 4 is connected to one end of the rotation stopping through hole, and the other end of the rotation stopping spring abuts against the rotation stopping protrusion 8. The elastic force of the rotation stopping spring 4 is used for pushing the rotation stopping shaft 2 to move, and further pushing the rotation stopping protrusion 8 to move to the communication hole 5.
The anti-rotation protrusion 8 is provided with a contact surface 9 in cooperation with the anti-rotation ball 3, so that the anti-rotation ball 3 is pushed into the limiting pit 7 when the anti-rotation ball 3 is in cooperation with the contact surface 9. The contact surface 9 is parallel to the cylindrical surface of the outer wall of the rotation stopping shaft 2.
When the trip mechanism of the cut-off valve is used, one end of the rotation stopping through hole is connected with the executing mechanism. The actuator may be electric or driven by other means. So long as it can push the rotation stopping shaft 2 to move when the rear end of the cut-off valve is overpressurized.
If the rear end of the cut-off valve is overpressured, the actuating mechanism pushes the rotation stopping shaft 2, so that the rotation stopping protrusion 8 arranged on the rotation stopping shaft 2 moves along with the rotation stopping ball 3. After the rotation stopping balls 3 lose the blocking of the rotation stopping protrusions 8, the rotation stopping balls 3 can freely move along the communication holes 5. This also causes the torsion force of the spool shaft 6 to push the detent ball 3 to move freely along the communication hole 5 away from the restricting pit 7. The valve core shaft 6 can freely rotate after losing the limit of the rotation stopping ball 3, so that the valve core shaft 6 rotates under the torsion effect to cut off the valve. Thereby avoiding the damage to equipment at the back of the cut-off valve caused by the continuous communication of the front and the back of the cut-off valve. When the valve is reset, an external force is applied to enable the valve core shaft 6 to rotate, and then the limiting pit 7 is aligned with the communication hole 5. The rotation stopping shaft 2 can be reset under the action of the rotation stopping spring 4, and the rotation stopping protrusion 8 is moved to the position of the communication hole 5. The rotation stopping protrusion 8 can push the rotation stopping ball 3 into the limiting pit 7, so as to limit the valve core shaft 6.
Since the rotation stopping protrusion 8 is provided with the contact surface 9 in cooperation with the rotation stopping ball 3, the contact surface 9 is parallel to the cylindrical surface of the outer wall of the rotation stopping shaft 2. This makes the mating portion of the rotation stopping protrusion 8 and the rotation stopping ball 3 planar. The contact surface 9 is wider along the length of the stopper shaft 2. During assembly, the rotation stopping shaft 2 does not need to be accurately adjusted along the axial direction, and the assembly difficulty is greatly reduced as long as the rotation stopping ball 3 is enabled to be abutted to the contact surface 9. In addition, since the contact surface 9 increases with the contact surface 9 of the anti-rotation ball 3, the force receiving surface increases, and the contact surface 9 is hard to form a pit. Further, the rotation stopping protrusion 8 can effectively push the rotation stopping ball 3 into the limiting pit 7, the matching tightness of the rotation stopping ball 3 and the limiting pit 7 is further guaranteed, and the limiting effect of the rotation stopping ball 3 on the valve core shaft 6 is guaranteed.
In the present embodiment, the rotation stopping protrusion 8 is provided cylindrically around the rotation stopping shaft 2 such that the contact surface 9 is a cylindrical surface. One side of the rotation stopping protrusion 8 is provided with a truncated cone-shaped transition section 10. The outer diameter of the large diameter end of the transition section 10 is the same as the outer diameter of the rotation stopping protrusion 8. The outer diameter of the small diameter end of the transition section 10 is the same as the outer diameter of the stop shaft 2. This results in a transition between the contact surface 9 and the surface of the rotation stop shaft 2 by means of a bevel. When the rotation stopping spring 4 pushes the rotation stopping shaft 2 to move, the rotation stopping ball 3 can move along the inclined plane and further move to be matched with the contact surface 9. So that the movement of the rotation stopping shaft 2 is more convenient.
In this embodiment, the outer wall of the stopper shaft 2 is provided with a guide projection 11. The guide protrusion 11 may be a protrusion protruding from the surface of the rotation stopping shaft 2. The inner wall of the rotation stopping through hole is provided with a guide groove along the circumferential direction of the rotation stopping through hole, which is matched with the guide protrusion 11. The guide projection 11 is limited to the guide groove and can move along the guide groove. The guide groove comprises an inclined section 12, a parallel section 13 and a guide section 14. The parallel section 13 is parallel to the length direction of the rotation-stopping through hole. The inclined section 12 is inclined to the longitudinal direction of the rotation-stopping through hole. The inclined section 12 and the parallel section 13 are each provided with several. The inclined sections 12 and the parallel sections 13 are alternately distributed along the circumferential direction of the inner wall of the rotation stopping through hole, and the inclined sections 12 and the parallel sections 13 are connected end to end in sequence to form a closed annular groove. A schematic view of the spreading of the guide grooves in a plane is shown in fig. 3, and the guide grooves are distributed in an S shape. The inclined section 12 and the parallel section 13 are connected by a guide section 14. The guide section 14 is inclined so that the guide protrusions 11 move in the same direction in the ring groove.
Taking the example in fig. 3, when the rotation stopping shaft 2 moves rightward, the guide projection 11 moves rightward along the parallel section 13. When the guide projection 11 moves rightward and enters the guide section 14, the guide projection 11 moves to face the inclined section 12 under the guide of the guide section 14. When the actuator pushes the rotation stop shaft 2 to move leftwards, the guide projection 11 enters the inclined section 12 and moves along the inclined section 12. As a result of the inclination of the inclined section 12, the rotation shaft 2 will rotate under the influence of the guide groove. In the same way, after the rotation stopping shaft 2 moves to the left end, the guide projection 11 moves to face the next parallel segment 13. The next time the rotation stop shaft 2 is moved to the right, it will only translate and not rotate.
This causes the actuator to push the rotation shaft 2 to rotate a certain angle every time it acts. The contact surface 9 will engage the detent ball 3 in different positions after each reset of the detent shaft 2. Thereby avoiding the formation of pits in the fixed point of the contact surface 9 caused by long-term matching of the rotation stopping ball 3. Meanwhile, the rotation stopping protrusion 8 can drive the rotation stopping ball 3 to rotate in the process of translation and rotation. Since the rotation stopping protrusion 8 is a combined movement of translation and rotation, the rotation of the rotation stopping ball 3 is also a combined rotation in two directions. Which in turn makes it possible for every position of the surface of the anti-rotation ball 3 to cooperate with the contact surface 9. And after each action the contact surface 9 and the anti-rotation ball 3 are replaced by a contact point. So that the service lives of the rotation stopping ball 3 and the rotation stopping shaft 2 are greatly prolonged. The reliability is effectively ensured.
In addition, the rotation angle of the rotation stopping shaft 2 can be adjusted each time by setting the inclination angle of the inclination section 12 according to the need. The smaller the angle, the denser the mating point of the surface of the contact surface 9 and the anti-rotation ball 3.
In this embodiment, a guide tube 15 is provided in the rotation stopping through hole. The guide grooves are provided on the inner wall of the guide tube 15. The guide tube 15 is screwed inside the rotation stopping through hole. Thereby allowing the guide tube 15 to be replaced as desired. The guide groove is arranged on the inner wall of the guide tube 15, so that the processing of the guide groove is the processing of the inner wall of the guide tube 15. Because the guide pipe 15 is an independent part, the guide pipe can be conveniently machined on the inner wall of the guide pipe after being detached from the inside of the rotation stopping through hole, and then the guide groove is conveniently machined.
In this embodiment, the outer wall of the guide tube 15 is provided with screw holes. The hole wall of the rotation stopping through hole is provided with a strip-shaped through hole 16 matched with the screw hole of the guide pipe 15. The bar-shaped through hole 16 is provided along the circumferential direction of the rotation stopping through hole. The screw holes are provided with locking screws 17 in a matching way. The locking screw 17 is connected to the screw hole of the guide tube 15 through the bar-shaped through hole 16. After the guide tube 15 is fitted into the rotation-stopping through hole, the lock screw 17 is passed through the bar-shaped through hole 16 and connected to the screw hole of the guide tube 15. The guide tube 15 can be locked inside the rotation-stopping through hole by locking the locking screw 17.
Since the angle of each rotation of the rotation stop shaft 2 is fixed. When it makes one revolution, the contact point of the contact surface 9 with the anti-rotation ball 3 returns to the original point. That is, the portion between the adjacent two points cannot be in contact with the anti-rotation ball 3. After the guide tube 15 is added, the guide tube 15 can be rotated by a certain angle according to the requirement and locked with the anti-rotation through hole again through the locking screw, so that different positions of the contact surface 9 contact the anti-rotation ball 3. This also allows the rotation stop shaft 2 to contact the rotation stop ball 3 at a new point after each rotation. This enables every point of contact surface 9 to be engaged by the anti-rotation ball 3. Further increasing the service life. By this arrangement, the inclination angle of the inclined section 12 can be increased, and the arrangement density of the inclined section 12 can be reduced, thereby reducing the processing difficulty of the guide tube 15.
In this embodiment, the side of the rotation-stopping projection 8 remote from the transition section 10 is provided with an annular groove. The axis of the rotation stopping shaft 2 passes through the center of the annular groove. A rotating ring 18 is disposed within the annular groove. The rotating ring 18 may be a bearing structure, or may be a metal ring directly, and grease may be applied to the metal ring. So long as it is ensured that the swivel ring 18 can swivel easily relative to the rotation stop projection 8. The rotation stop spring 4 is pressed against the rotation ring 18.
When the rotation stopping shaft 2 rotates, the rotation stopping spring 4 cannot rotate along due to the action of the rotating ring 18, so that the situation that the guide protrusion 11 rotates to leave a preset position under the torsion action of the rotation stopping spring 4 after passing through the guide section 14 due to torsion generated by the rotation stopping spring 4 is avoided. Thereby effectively ensuring that the guide projection 11 can enter the predetermined parallel section 13 or the inclined section 12 each time. The stability of the device is ensured.
In this embodiment, the guide tube 15 includes a guide portion 19 and a stopper portion 20 connected to each other. The aperture of the limiting portion 20 is smaller than the aperture of the guiding portion 19. So that the stop shaft 2 cannot move further to the limit part 20 when moving rightward. Thereby achieving the limiting effect.
In this embodiment, the two ends of the rotation stopping through hole are respectively provided with a sealing cap 21 and a guide tube 15. The cap 21 is screwed to the end of the rotation-stopping through hole. The rotation stop spring 4 is pressed against between the closure cap 21 and the rotary ring 18. The end of the rotation-stopping through hole is closed by a sealing cap 21. The sealing cap 21 can be conveniently disassembled and assembled, so that the inside maintenance is convenient.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A trip mechanism of a cut-off valve comprises a shell (1), a rotation stopping shaft (2), a rotation stopping ball (3) and a rotation stopping spring (4); the shell (1) is provided with a valve core through hole penetrating through the valve core shaft (6) and a rotation stopping through hole penetrating through the rotation stopping shaft (2); a communication hole (5) for communicating the valve core through hole and the rotation stopping through hole is arranged between the valve core through hole and the rotation stopping through hole; the anti-rotation ball (3) is arranged on the communication hole (5); the outer wall of the valve core shaft (6) is provided with a limiting pit (7) in cooperation with the communication hole (5) so that the anti-rotation ball (3) can enter the limiting pit (7) through the communication hole (5); the surface of the rotation stopping shaft (2) is provided with a rotation stopping protrusion (8) in a protruding mode in cooperation with the rotation stopping ball (3), so that the rotation stopping protrusion (8) pushes the rotation stopping ball (3) to the limit pit (7) when being positioned in the communication hole (5); the rotation stopping spring (4) is matched with the rotation stopping shaft (2) to enable the rotation stopping spring (4) to push the rotation stopping protrusion (8) to move to the communication hole (5); the method is characterized in that: the anti-rotation protrusion (8) is provided with a contact surface (9) matched with the anti-rotation ball (3), so that when the anti-rotation ball (3) is matched with the contact surface (9), the anti-rotation ball (3) is pushed into the limit pit (7); the contact surface (9) is parallel to the cylindrical surface of the outer wall of the stop shaft (2).
2. The trip valve trip mechanism of claim 1, wherein: the rotation stopping protrusion (8) is arranged in a cylindrical shape around the rotation stopping shaft (2) so that the contact surface (9) is a cylindrical surface; one side of the rotation stopping bulge (8) is provided with a truncated cone-shaped transition section (10); the outer diameter of the large-diameter end of the transition section (10) is the same as the outer diameter of the rotation stopping protrusion (8); the outer diameter of the small-diameter end of the transition section (10) is the same as the outer diameter of the stop shaft (2).
3. The trip valve trip mechanism of claim 2, wherein: the outer wall of the stop shaft (2) is provided with a guide protrusion (11); the inner wall of the rotation stopping through hole is provided with a guide groove along the circumferential direction of the rotation stopping through hole, which is matched with the guide protrusion (11); the guide groove comprises an inclined section (12), a parallel section (13) and a guide section (14); the parallel section (13) is parallel to the length direction of the rotation stopping through hole; the inclined section (12) is inclined to the length direction of the rotation stopping through hole; the inclined section (12) and the parallel section (13) are provided with a plurality of sections; the inclined sections (12) and the parallel sections (13) are alternately distributed along the circumferential direction of the inner wall of the rotation-stopping through hole, and the inclined sections (12) and the parallel sections (13) are connected end to end in sequence to form a closed annular groove; the inclined section (12) and the parallel section (13) are connected through the guide section (14); the guide section (14) is arranged obliquely so that the guide projections (11) move in the same direction in the ring groove.
4. The trip valve trip mechanism of claim 3, wherein: a guide pipe (15) is arranged in the rotation stopping through hole; the guide groove is arranged on the inner wall of the guide pipe (15).
5. The trip valve trip mechanism of claim 4, wherein: the outer wall of the guide pipe (15) is provided with a screw hole; the hole wall of the rotation stopping through hole is matched with the screw hole of the guide pipe (15) and provided with a strip-shaped through hole (16); the strip-shaped through holes (16) are arranged along the circumferential direction of the rotation stopping through holes; the screw hole is provided with a locking screw (17) in a matched mode; the locking screw (17) is connected to the screw hole of the guide tube (15) through the strip-shaped through hole (16).
6. The trip valve trip mechanism of claim 5, wherein: an annular groove is formed in the side face of one side, far away from the transition section (10), of the rotation stopping protrusion (8); the axis of the stop shaft (2) passes through the center of the annular groove; a rotary ring (18) is arranged in the annular groove; the anti-rotation spring (4) is tightly propped against the rotary ring (18).
7. The trip valve trip mechanism of claim 6, wherein: the guide pipe (15) comprises a guide part (19) and a limit part which are connected with each other; the aperture of the limiting part is smaller than the aperture of the guiding part (19).
8. The trip valve trip mechanism of claim 7, wherein: sealing caps (21) and the guide pipes (15) are respectively arranged at two ends of the rotation stopping through holes; the sealing cap (21) is connected to the tail end of the rotation stopping through hole in a threaded manner; the anti-rotation spring (4) is tightly propped between the sealing cap (21) and the rotary ring (18).
9. The trip valve trip mechanism of claim 8, wherein: the stop shaft (2) is perpendicular to the valve core shaft (6).
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| CN117588585B (en) | 2024-05-14 |
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