WO2017202151A1 - 一种强制密封球阀 - Google Patents

一种强制密封球阀 Download PDF

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Publication number
WO2017202151A1
WO2017202151A1 PCT/CN2017/080179 CN2017080179W WO2017202151A1 WO 2017202151 A1 WO2017202151 A1 WO 2017202151A1 CN 2017080179 W CN2017080179 W CN 2017080179W WO 2017202151 A1 WO2017202151 A1 WO 2017202151A1
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WO
WIPO (PCT)
Prior art keywords
valve
ball
forced
seal
sealing
Prior art date
Application number
PCT/CN2017/080179
Other languages
English (en)
French (fr)
Inventor
刘晓琦
Original Assignee
刘晓琦
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 刘晓琦 filed Critical 刘晓琦
Priority to CA2984745A priority Critical patent/CA2984745C/en
Priority to EP17801997.2A priority patent/EP3467357A4/en
Priority to US15/678,507 priority patent/US9903483B2/en
Publication of WO2017202151A1 publication Critical patent/WO2017202151A1/zh
Priority to US15/872,000 priority patent/US10415711B2/en
Priority to US16/516,331 priority patent/US10859169B2/en
Priority to US16/599,834 priority patent/US10920893B2/en

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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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F16K5/0605—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor with particular plug arrangements, e.g. particular shape or built-in means
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • 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
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/08—Details
    • F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
    • F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
    • F16K5/204—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces with the plugs or parts of the plugs mechanically pressing the seals against the housing

Definitions

  • the invention belongs to a ball valve, and more particularly to a forced sealing ball valve.
  • the traditional lifting rod type forced sealing ball valve adopts the lifting stem rail guiding design, although the valve can be made to have no contact with the valve seat for most of the time of the switch, no friction, but still exists in the final cohesion phase of the valve ball and the valve seat sealing surface. Relative sliding friction, there is no real frictionless rotation; the forced engagement between the valve ball and the valve seat can be completed by the wedge surface of the valve stem and the cooperation of the lower shaft of the valve ball.
  • This design discloses a ball valve, and more particularly to a forced seal ball valve including a valve body, a sub valve body, a ball body, a valve seat, and a sub valve body fluid pipe, the pair
  • the outer ring of the valve body fluid pipe has a stud nut driven forced sealing device, wherein the worm wheel and the active stud have a flat key connection, and when the active stud rotates, the axis of the driven nut that can be screwed together can be
  • the axial movement of the sliding keyway along the guide key on the fluid line of the auxiliary valve body can generate the required sealing pressure between the valve seat and the ball body in the valve chamber through the pressure transmission system through the pressure generated by the external pressure.
  • the design uses two sets of operating mechanisms, one set of operating valve ball 90 degrees rotation, the other set of operating mechanism is called the part of the valve body, the driving valve seat and the valve ball to complete the cohesion.
  • This design valve has many potential leaks, complicated structure, and the valve is bloated, not Must meet the standard valve face to face size.
  • the design includes a valve body, a valve cover, a valve stem, a wedge-shaped vertebral body and a valve flap, characterized in that the top of the valve body is connected to the valve cover, and the top of the valve cover is at the center
  • the valve stem is vertically fixed by the bracket, and the bottom of the valve stem is fixed to the wedge-shaped vertebral body in the valve body cavity through the through-hole pin in the center of the valve cover, and is interlocked with the wedge-shaped vertebral body, that is, the lifting rotation is performed along the axial direction of the fixed shaft.
  • a fixed shaft is vertically disposed at a center of a bottom portion of the valve body cavity, and the fixed shaft is matched with a groove at a center of a bottom portion of the wedge cone, and the two ends of the valve body cavity are fixed by a T-shaped groove.
  • a flap limiting device is respectively disposed on the top of the valve flap and the inner wall on both sides of the valve body cavity, and the flap limiting devices on the two sides are closely connected with the two side walls of the wedge cone.
  • the design is actually a forced-sealing plug valve (also known as DBB plug valve in the industry). Although the valve can achieve a forced seal in the closed position, due to the sliding flap assembly, the valve flap will be turbulent when the valve is open. The impact of the flow. Currently, this design is only suitable for applications in low pressure liquid applications.
  • the design includes a ball, a valve seat and a movable sealing ring seat mounted between the ball and the valve seat, and also includes a forced sealing ring along the axial direction of the sealing ring seat.
  • a hydraulic device of the seat the hydraulic device being mounted between the valve seat and the seal ring seat.
  • the design uses a hydraulic system to apply pressure to the seal ring between the seat and the ball to achieve a forced seal. The hydraulic leakage of the valve and the complex mechanism can affect the seal reliability and life of the valve.
  • the design of the opening and closing member has two eccentric spherical structures.
  • This eccentric structure allows the two eccentric spherical surfaces to be generated when the valve stem drives the opening and closing member to rotate.
  • the movement of the downstream seat and the upstream seat in the axial direction produces the effect of pressing or loosening the seat, thereby achieving a forced seal of the opening and closing member and the downstream and upstream seats at a particular valve position.
  • the design valve will be affected by turbulence during the opening position, and the two eccentric spherical structures may be affected by turbulent vibration damage and affect valve reliability and life.
  • This design relates to a modular design of the angular stroke operation of the forced sealing valve, the main components of which include the valve body, the opening and closing member, the valve cover, the valve stem, the valve seat, the guide tube, the valve Seat support plate, guide tube support plate, operating mechanism and drain valve.
  • the opening and closing member is disposed between the valve seat and the draft tube, and the convex surface and the concave surface are mutually eccentric spherical structures.
  • the thickness of the opening and closing member can be adjusted by adjusting the relative positions of the convex spherical surface and the concave spherical surface and their radii.
  • this design is not a mandatory seal ball valve in the complete sense.
  • the object of the present invention is to propose a technical solution for forcibly sealing a ball valve, improving the operation performance and sealing effect of the ball valve.
  • a forced sealing ball valve including a valve seat, a valve ball and a valve a lever, the valve ball including a valve ball body and a sealing cover, the valve stem driving the valve ball to reciprocally rotate between an open position and a closed position; the sealing cover is rotated when the valve ball body is rotated to a closed position The valve body extends out to entangle with the valve seat.
  • valve ball body is provided with a screw driving wheel that is screwed with the sealing cover, and the screw driving wheel is used to jack up and retract the sealing cover when the screw is rotated.
  • valve stem drives the screw drive wheel to rotate.
  • spiral drive wheel is provided with a toothed disc that drives the spiral drive wheel to rotate by a seal drive gear.
  • an intermediate transmission gear is disposed between the spiral driving wheel and the sealed driving gear.
  • valve ball body stops rotating when it is rotated from the open position to the closed position, and the valve stem continues to rotate in the closing direction to drive the sealing cover to engage with the valve seat.
  • valve ball body has a rotation stroke of 90°.
  • the lower shaft of the valve ball body is provided with a 90-degree fan-shaped projection, and the lower shaft cavity of the valve body is provided with a 180-degree limiting groove.
  • valve stem drives the valve body to rotate by an elastic member.
  • the elastic member is a torsion spring.
  • valve stem is provided with a torsion spring
  • the torsion spring is sleeved on the torsion spring shaft
  • valve stem and the valve ball body are respectively provided with torsion spring foot holes
  • the torsion spring of the torsion spring The feet are respectively embedded in the stem of the valve stem and the ball spring body.
  • the elastic member applies a pre-driving force to the valve ball body to rotate the valve ball body toward the closed position.
  • sealing cover is retracted to the valve ball body and is in contact with the valve ball body during the opening of the forced sealing ball valve.
  • the utility model has the advantages that the valve has compact structure, realizes frictionless opening and closing, and the forced sealing cohesion force is uniform and reliable, and the valve ball is contracted and locked in the opening position to avoid turbulent flow damage, the ball valve operating torque is small, the switching action is rapid, the valve The rod seal is simple and reliable.
  • Figure 1 is a structural view of the present invention
  • Figure 2 is an exploded view of the structure of the present invention
  • Figure 3 is an exploded perspective view of the present invention, which is an A-direction view of Figure 2;
  • Figure 4 is a structural view of the valve ball, the valve seat and the valve stem of the present invention.
  • a forced seal ball valve includes a valve seat 10, a valve ball and a valve stem 20, the valve ball including a valve ball body 30 and a sealing cover 40, the valve stem driving the valve ball to open Reciprocatingly rotating between the position and the closed position; the sealing cover projects from the valve ball body to engage with the valve seat when the valve ball body is rotated to the closed position.
  • the valve ball body is provided with a screw driving wheel 60 which is screwed with the sealing cover, and the screw driving wheel is used to jack up and retract the sealing cover by rotating.
  • the valve stem drives the spiral drive wheel to rotate.
  • the helical drive wheel is provided with a toothed disc 62 that drives the helical drive wheel to rotate by a seal drive gear 70.
  • An intermediate transmission gear 80 is disposed between the spiral drive wheel and the sealed drive gear.
  • a linear motion fit is used between the sealing cover and the valve ball body.
  • valve ball body stops rotating when it is rotated from the open position to the closed position, and the valve stem continues to rotate in the closing direction to drive the sealing cover to engage with the valve seat.
  • the valve ball body has a rotational stroke of 90° between the open position and the closed position.
  • the lower rotating shaft of the valve ball body is provided with a 90° fan-shaped projection 33, and the lower shaft cavity of the valve body is provided with a 180° limiting groove 13.
  • the valve stem drives the valve body to rotate by a resilient member 50.
  • the elastic element is a torsion spring.
  • a bottom end of the valve stem is provided with a torsion spring shaft 21, the torsion spring is sleeved on the torsion spring shaft, and the valve stem and the valve ball body are respectively provided with torsion spring foot holes (22, 34), The two torsion spring legs of the torsion spring are respectively embedded in the valve stem and the torsion spring foot hole of the valve ball body.
  • the elastic member When the valve ball is in the open position, the elastic member applies a pre-driving force to the valve ball body to rotate the valve ball body toward the closed position.
  • the sealing cap retracts to the valve ball body and contacts the valve ball body during opening of the forced sealing ball valve.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • a forced seal ball valve includes a valve seat 10, a valve ball and a valve stem 20, the valve ball including a valve ball body 30 and a sealing cover 40.
  • valve ball is installed in the valve body 11, and the valve body is provided with an upper cover 14, and the valve stem is installed in the upper cover.
  • the outer surface of the valve ball body is a spherical surface, and the valve ball body is provided with a valve ball through hole 35.
  • the axis of the valve ball through hole is perpendicular to the rotation axis of the valve ball (ie, the rotation axis of the valve stem), and the valve ball is in the open position.
  • the ball through hole communicates with the valve seat to circulate the medium through the ball valve.
  • the valve ball body is provided with a top pressure guiding hole 31.
  • the top pressure guiding hole is a regular hexagonal hole; the axis X of the top pressure guiding hole is perpendicular to the rotation axis Y of the valve ball, and passes through the spherical center of the valve ball, and the top The axis of the pressure guiding hole is also perpendicular to the axis of the valve ball through hole.
  • a lower shaft 32 is disposed at a lower end of the valve body, the lower shaft is coaxial with the rotation axis of the valve ball, and the end of the lower shaft is provided with a 90-degree fan-shaped projection 33.
  • An upper shaft 36 is provided at an upper end of the valve body, and a torsion spring hole 34 is provided at a top end of the upper shaft.
  • An intermediate transmission shaft 37 is provided between the upper shaft and the top pressure guide hole.
  • the valve ball body is provided with a spherical defect surface 38 on a side of the top pressure guiding hole, and the spherical surface is perpendicular to the axis of the top pressure guiding hole.
  • the outer shape of the sealing cover 40 is the same spherical shape as the ball body of the valve body, and includes a spherical surface 43 and a spherical surface 44.
  • the sealing cover is provided with a pressing screw hole 42 at the center of the side of the spherical surface.
  • a linear motion fit is adopted between the sealing cover and the valve ball body, and a guide shaft 41 is arranged in the pressing screw hole, and the guide shaft is a hexagonal shaft, which is slidably engaged with the top pressure guiding hole 31 of the valve ball body, so that the sealing cover is along the top
  • the axis of the pressure guiding hole reciprocates.
  • the hexagonal shaft prevents the sealing cover from rotating relative to the valve body so that the helical drive wheel drives the sealing cover by threads.
  • a spiral driving wheel 60 is mounted on the valve ball body, and the spiral driving wheel is provided with a top pressing stud 61 that cooperates with a pressing screw hole of the sealing cover.
  • the spiral drive wheel is provided with a toothed disc 62 coaxial with the top pressure stud, and the toothed disc 62 is a tapered tooth.
  • the spiral drive wheel is mounted on a stud shaft 39 of the valve ball body via a pressure ring 63.
  • a seal drive gear 70 is mounted on the valve stem, the seal drive gear is a bevel gear, and a multi-rib hole 71 is provided in the center of the seal drive gear.
  • An intermediate transmission gear 80 is disposed between the spiral driving wheel and the sealed driving gear, and the intermediate transmission gear is mounted on the intermediate transmission shaft 37 of the valve ball body.
  • the intermediate transmission gear is also a bevel gear, and the intermediate transmission gear is respectively combined with the sealing driving gear and the spiral driving wheel.
  • the toothed disc is engaged, so that the valve stem drives the spiral driving wheel to rotate through the sealed driving gear.
  • the sealing cover reciprocates toward the valve seat by the pressing screw hole of the sealing cover.
  • valve ball is installed in the valve body 11, the valve body is provided with a lower shaft chamber 12 corresponding to the lower shaft of the valve ball body, and the lower shaft chamber is provided with a fan-shaped protrusion 33 corresponding to the end of the lower shaft of the valve ball body, 180 Limiting groove 13 of degree. Limit the rotational travel of the ball body to 90°.
  • the bottom end portion of the valve stem has a polygonal shape 23, and the sealed driving gear forms a driving fit with the bottom end of the valve stem through the polygonal hole 71, so that the valve stem drives the sealed driving gear to rotate synchronously.
  • valve stem drives the valve body to rotate by a torsion spring 50.
  • the connecting end of the valve stem is provided with a torsion spring shaft 21 extending into the valve stem, the torsion spring is sleeved on the torsion spring shaft, the valve stem is provided with a torsion spring foot hole 22, and the two torsion spring legs of the torsion spring are respectively embedded in the valve stem.
  • the torsion spring needs to always apply a force to the valve ball body to rotate the valve ball body in the closing direction. Therefore, when the valve ball is in the open position, the torsion spring applies a force to the valve body.
  • the pre-driving force of the ball body rotating in the direction of the closed position is matched by the driving between the valve stem and the sealed driving gear, and the helical driving gear drives the sealing cover to be tightened with the valve ball body under the transmission of the intermediate gear, and is balanced.
  • the valve seat is provided with a seal 15 that cooperates with the spherical surface of the sealing cover.
  • a rotation gap is formed between the sealing of the valve seat and the valve ball body.
  • the valve stem drives the ball to reciprocate between an open position and a closed position.
  • the valve stem drives the valve body to rotate by the torsion spring 50.
  • the valve ball body rotates from the open position to the closed position, due to the pre-driving force of the torsion spring on the valve ball body, in the initial stage, the valve ball body rotates synchronously with the valve stem, and there is no relative rotation between the sealed drive gear and the ball valve body, and the seal is sealed.
  • the cover does not protrude from the valve body.
  • valve stem When the valve ball body rotates to the closed position, the valve stem continues to rotate in the closing direction due to the limit action of the scallops 33, and the valve cover continues to extend from the valve ball body, presses the valve seat and mate with the valve seat, and seals The spherical contact of the cover is in sealing contact with the valve seat, achieving a forced seal closure.
  • valve stem rotates in the opening direction and drives the sealing drive gear to rotate synchronously. Due to the force of the torsion spring, the valve ball body does not rotate, and the seal drive gear drives the sealing cover to retract toward the valve ball body, and the spherical defect plane 44 of the sealing cover contacts the ball missing surface 38 of the valve ball body.
  • the valve stem continues to rotate in the opening direction. Since the sealing cover has been in contact with the valve ball body, the sealing drive gear no longer rotates relative to the valve ball body, and the valve stem drives the valve ball body and the sealing cover to rotate together to the open position.
  • the outer contour of the sealing cover should not exceed the overall spherical outer contour of the valve ball body.
  • the outer contour of the sealing cover and the outer contour of the valve ball body Form an integral spherical outer contour.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • a forced sealing ball valve this embodiment is a structural extension of the forced sealing ball valve of the first embodiment.
  • the forced sealing ball valve of this embodiment is provided with two sealing covers on the valve ball body, and at the same time is engaged with the upstream valve seat and the downstream valve seat.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • a forced sealing ball valve which is a structural replacement of the forced sealing ball valve according to the first embodiment.
  • the valve ball body is provided with a screw driving wheel which is screwed to the sealing cover, and the screw driving wheel drives the sealing cover to protrude from the valve ball body when the spiral driving wheel rotates.
  • the spiral driving wheel is provided with a screw hole
  • the sealing cover is provided with a stud matched with the screw hole of the spiral driving wheel; when the spiral driving wheel rotates, the sealing cover is driven to reciprocate toward the valve seat through the screw hole.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • a forced sealing ball valve which is a structural replacement of the forced sealing ball valve according to the first embodiment.
  • the sealing cover is provided with a guiding hole, the guiding hole is a rib hole; the valve ball body is provided with a guiding shaft, and the guiding shaft is slidable with the sealing hole of the sealing cover The axis of the dynamic fit.
  • Embodiment 5 is a diagrammatic representation of Embodiment 5:
  • a forced sealing ball valve this embodiment is a structural replacement of the forced sealing ball valve according to the first embodiment or the fourth embodiment.
  • valve ball body and the sealing cover are connected by a key shaft to reciprocate the sealing cover toward the valve seat.
  • a forced sealing ball valve this embodiment is a structural replacement of the forced sealing ball valve according to the first embodiment or the fourth embodiment.
  • valve ball body and the sealing cover are connected by a spline shaft to reciprocate the sealing cover toward the valve seat.
  • a forced sealing ball valve which is a structural replacement of the forced sealing ball valve according to the first embodiment.
  • the bottom end portion of the valve stem is a spline
  • the seal drive gear is provided with a spline hole that cooperates with the connecting end of the valve stem.
  • the sealed driving gear forms a driving cooperation with the bottom end of the valve stem through the spline hole, so that the valve stem drives the sealed driving gear to rotate synchronously.
  • Embodiment 8 A forced sealing ball valve, this embodiment is a structural replacement of the forced sealing ball valve of the first embodiment.
  • the valve body adopts a side-mounted structure.
  • Embodiment 9 A forced sealing ball valve, which is a structural replacement of the forced sealing ball valve of the first embodiment.
  • valve body adopts an all-welded structure.
  • the invention starts from the realization of the basic structure of the seal, and satisfactorily solves the shortcomings of various forced sealing ball valves.
  • the relative sliding friction at the final stage of the sealing stroke, the valve seat normal sealing component is insufficient, the structure and volume are large, some designs need to use the hydraulic system, and some designs exist when the valve is open, the valve ball assembly is affected by turbulence, etc. problem.
  • the invention adopts a rotary shaft ball and a fixed valve seat design.
  • a part of the valve ball assembly by a screw jacking mechanism if the invention is applied to a plug valve, it may also be part of the plug assembly, that is, a technique in which the sealing cap is jacked up against the valve seat and pressed to achieve a forced seal .
  • the movement range of the valve ball body of the valve is limited by the fine limit position of the lower shaft cavity of the valve body, and is accurately stopped at the switch position of 90 degrees; by the action of the torsion spring, the sealing cover is in the position other than the sealing position of the valve
  • the ball body shrinks and locks together; thus, the ball valve 90 degree switch and the seat sealing surface are frictionlessly rotated.
  • the sealing cover Due to the spiral rotary jacking principle, the sealing cover is stable and reliable, and the matching precision of the sealing cover and the sealing surface of the valve seat is easily realized.
  • the valve is compact enough to meet standard face-to-face sizes and can even be shorter.
  • the valve stem part only needs to consider the angular stroke seal, the structure is simple, the seal is reliable, and the valve switch stroke time is short.
  • the innovations of the present invention mainly have the following aspects:
  • valve ball body The axial sequential positional relationship of the valve ball body, the spiral drive wheel, the seal cover and the valve seat.
  • the screw pressing action produces a coercive pressure that is perpendicular to the valve seat sealing surface, so that no angular motion is superimposed, and sliding friction occurs, and the sealing is uniform and reliable.
  • valve seat and the sealing cover are simultaneously disengaged at the time of valve opening and have uniform self-cleaning property: the valve opening action starts from the reverse rotation of the screw driving wheel under the joint action of the torsion spring and the valve opening torque, and the sealing cover is also subjected to the same
  • the limitation of the hexagonal column can not be rotated with the screw drive wheel, and it can be disengaged from the valve seat under the guidance of the spiral rotation, and finally locked with the valve ball body under the joint action of the torsion spring and the valve opening torque, then the valve ball The assembly will only rotate until the valve is fully open.
  • the torque of the operating valve switch acts directly on the sealed drive gear through the valve stem.
  • the gear set Before the sealing cover is aligned with the valve seat, the gear set remains locked and does not rotate.
  • the valve stem rotates torque.
  • the seal drive gear will be driven first to rotate, and the torque is transmitted to the spiral drive wheel through the intermediate drive gear to directly rotate the screw jacking mechanism to achieve a forced seal.
  • the transmission of torque from the intermediate transmission gear can greatly reduce the volume of the valve ball assembly, thereby greatly reducing the volume of the entire valve.
  • Torsion spring locking device and follow-up control between the ball body and the sealed drive gear a simple and reliable torsion spring is installed between the valve stem and the ball body, and the lower part of the valve stem and the sealed drive gear
  • the rib engagement forms a drive fit (may also be splined), and the torque mechanism between the valve body and the valve stem and the seal drive gear is applied to the gear set mechanism while the seal cap and the valve ball body are fully tightened.
  • Proper locking torque so that the sealing cover and the ball body are locked during the switching process, so that the valve ball assembly is frictionlessly rotated without contact with the valve seat.
  • the torsion spring When the valve is opened, the torsion spring will apply a torsion force to keep the valve body in the closed position, so that the gear mechanism transmits torque to drive the sealing cover and the ball body to tighten first, and the torsion spring will also superimpose the torque to seal the cover and the ball body. Tightening the lock.
  • the valve stem continues to rotate in the valve opening direction and the ball assembly will rotate together until the valve is fully open.
  • the torsion spring and the valve stem, the ball body and the sealed drive gear form a simple follow-up control, and the valve ball assembly is in a contracted and locked state except for the full closing position, on the one hand, the valve seat and the valve ball total
  • the friction is rotated by 90 degrees, and on the other hand, when the valve is fully open, the sealing cover avoids the vibration damage caused by the turbulence of the medium.
  • the mechanical limit mechanism of the lower shaft of the valve helps to realize the separation of the valve body and the sealed drive gear:
  • the lower shaft of the valve ball body is different from the ordinary shaft ball valve, but is processed with a 90-degree fan-shaped projection.
  • the lower shaft cavity of the valve body is provided with a 180-degree limiting groove corresponding to the lower shaft of the valve body.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Taps Or Cocks (AREA)
  • Mechanically-Actuated Valves (AREA)

Abstract

公开了一种强制密封球阀，包括阀座（10）、阀球和阀杆（20），阀球包括阀球本体（30）和密封盖（40），阀杆（20）驱动阀球在开启位置和关闭位置之间往复转动；密封盖（40）在阀球本体（30）转动到关闭位置时从阀球本体（30）伸出顶压阀座（10）并与阀座（10）抱合；阀门结构紧凑，实现无摩擦开启和关闭，强制密封抱合力均匀可靠，开启位置阀球收缩并锁紧，免受紊流破坏，球阀操作力矩小，开关动作迅速，阀杆密封简单可靠。

Description

一种强制密封球阀 技术领域
本发明属于球阀，尤其涉及一种强制密封球阀。
背景技术
在流体控制领域，如油气生产流程切换、管道关断、计量、调压、分子筛切换、压缩机进出口、炼油工艺中的氢气工况，合成氨装置的空分等操作频繁并对流体开关控制和关闭严密性要求苛刻的领域，要求阀门能够在直通的状态下尽可能小的产生压降，并且能够提供不受管线介质压力影响的强制扭矩密封。强制密封球阀被公认为理想的解决方案。
然而传统提升杆式强制密封球阀，采用提升阀杆轨道引导设计，尽管可以实现阀门在开关全程大部分时间与阀座无接触，无摩擦，但在阀球与阀座密封面最后抱合阶段仍存在相对滑动摩擦，没有真正做到无摩擦旋转；其阀球和阀座间的强制抱合通过阀杆的楔式面下压并配合阀球下转轴的共同作用才能完成。其动作过程不够平稳，容易受到阀座与转轴相对位置精度的影响；阀杆部分及其总成结构复杂，开关过程中需要叠加直行程和角行程运动；加工精度要求高；容易发生阀杆泄露；同时开关操作时间过长；通过国家知识产权局专利查询共找到如下6种强制密封球阀阀型：
申请公布号：CN104295764A，申请号：2014105008955：该设计采用偏心设置同步转动的阀杆和球体来启闭阀门。该设计本质上是偏心蝶阀的一种变形设计，在阀球与阀座密封面最后抱合阶段存在很大的角行程运动矢量从而产生相对滑动摩擦，没有真正做到无摩擦旋转；并且由于关闭的动作为角行程，阀球与阀座间的抱合法向分力不高，密封可靠性和实际使用寿命会受到影响。
申请公布号：CN103727260A，申请号：2014100163761：该设计公开了一种球阀，尤其涉及一种强制密封球阀，它包括阀体、副阀体、球体、阀座、副阀体流体管道，所述副阀体流体管道外圆上具有螺柱螺母驱动式强制密封装置，其中蜗轮和主动螺柱之间具有平键相联，主动螺柱旋转运动时，可使与其相旋合的从动螺母的轴向滑动键槽沿副阀体流体管道上的导向键作轴向直线运动，可把体外所产生的压力通过压力传递系统使阀腔内的阀座和球体之间产生所需的密封比压，实现低扭矩开、关和强制密封，通过自动化控制系统来完成螺柱螺母驱动式强制密封装置和电动执行器在开、关和密封过程中相关联的动作程序。该设计采用了两套操作机构，一套操作阀球90度旋转，另一套操作机构操作被称之为付阀体的部分，驱动阀座配合阀球完成抱合。这种设计阀门潜在漏点多，结构复杂，阀门体积臃肿，不 一定能够满足标准的阀门面对面尺寸。
申请公布号：CN103527809A，申请号：2013105342621：该设计包括阀体、阀盖、阀杆、楔式椎体及阀瓣，其特征在于所述阀体顶部与阀盖相连，所述阀盖顶部中央通过支架竖直固定阀杆，所述阀杆底部通过阀盖中央的通孔销接固定阀体内腔中的楔式椎体，与楔式椎体实现联动，即沿固定轴轴向做提升旋转运动；所述阀体内腔底部中央竖直设有固定轴，所述固定轴与楔式锥体底部中央的凹槽相适配，所述阀体内腔底部两端通过T型槽固定阀瓣，所述阀瓣的顶部、阀体内腔两侧的内壁上分别设有阀瓣限位装置，所述两侧的阀瓣限位装置与楔式锥体的两侧壁密合连接。该设计实际是一种强制密封旋塞阀(行业内也称DBB旋塞阀)，虽然阀门在关位能够实现强制密封，但由于采用滑动式阀瓣组件，阀门在开位时阀瓣将会受到紊流的影响。目前，这种设计仅适用于低压力液体工况的应用。
申请公布号：CN102979929A，申请号：2012105315085：该设计包括球体、阀座和活动的安装在球体与阀座之间起密封作用的密封环座，还包括可以沿密封环座轴向强制推动密封环座的液压装置，所述液压装置安装在阀座与密封环座之间。该设计采用一套液压系统向阀座和阀球间的密封环施压来实现强制密封，阀门的液压泄露和复杂的机构会影响阀门的密封可靠性和寿命。
申请公布号：CN105370909A申请号：2014104406033：该设计的启闭件具有两个偏心的球面结构，这种偏心结构使得当阀杆带动启闭件作旋转运动时，两个偏心的球面均会产生沿着下游阀座和上游阀座轴线方向的运动，从而产生压紧或放松阀座的效果，进而实现特定阀位下启闭件和下游阀座和上游阀座的强制密封。该设计阀门在开位时将会受到紊流的影响，两个偏心的球面结构可能因紊流震动受损而影响阀门可靠性和寿命。
申请公布号：CN104132157A申请号：2013101575904该设计涉及一种模块化设计角行程操作的强制密封阀，其主要部件包括阀体、启闭件、阀盖、阀杆、阀座、导流筒、阀座支撑板、导流筒支撑板、操作机构和排污阀等。启闭件布置在阀座和导流筒之间，其凸面和凹面为相互偏心球面结构，通过调节凸球面与凹球面球心的相对位置以及它们的半径，可以调节启闭件各处的厚度以调节阀门处于不同阀位时启闭件与阀座之间的密封比压，这使得阀门在某些阀位时可以实现强制密封。因此，该设计并不是完整意义上的强制密封球阀。
发明内容
本发明的目的是提出一种强制密封球阀的技术方案，提高球阀的操作性能和密封效果。
为了实现上述目的，本发明的技术方案是：一种强制密封球阀,包括阀座、阀球和阀 杆，所述阀球包括阀球本体和密封盖，所述阀杆驱动所述阀球在开启位置和关闭位置之间往复转动；所述密封盖在所述阀球本体转动到关闭位置时从阀球本体伸出与阀座抱合。
更进一步，所述阀球本体上设有与所述密封盖通过螺纹连接的螺旋驱动轮，所述螺旋驱动轮旋转时通过螺纹顶起和收回所述密封盖。
更进一步，所述阀杆驱动所述螺旋驱动轮旋转。
更进一步，所述螺旋驱动轮设有齿盘，所述阀杆通过密封驱动齿轮驱动所述螺旋驱动轮旋转。
更进一步，所述螺旋驱动轮与所述密封驱动齿轮之间设有中间传动齿轮。
更进一步，所述密封盖与所述阀球本体之间采用直线运动配合。
更进一步，所述阀球本体从开启位置转动到关闭位置时停止转动，所述阀杆继续向关闭方向转动，驱动所述密封盖与所述阀座抱合。
更进一步，所述阀球本体的转动行程为90°。
更进一步，阀球本体的下转轴设有90°的扇形凸起，所述阀体下部转轴腔设有180°的限位凹槽。
更进一步，所述阀杆通过一个弹性元件驱动所述阀球本体转动。
更进一步，所述弹性元件是扭转弹簧。
更进一步，所述阀杆的底端设有扭簧轴，所述扭转弹簧套在扭簧轴上，所述阀杆和阀球本体分别设有扭簧脚孔，所述扭簧的扭簧脚分别嵌入阀杆和阀球本体的扭簧脚孔中。
更进一步，所述弹性元件对所述阀球本体施加使阀球本体向关闭位置方向转动的预驱动力。
更进一步，所述密封盖在所述强制密封球阀的开启过程中向所述阀球本体缩回并与阀球本体接触。
本发明的有益效果是：阀门结构紧凑，实现无摩擦开启和关闭，强制密封抱合力均匀可靠，开启位置阀球收缩并锁紧，免受紊流破坏，球阀操作力矩小，开关动作迅速，阀杆密封简单可靠。
下面结合附图和实施例对本发明作一详细描述。
附图说明
图1是本发明结构图；
图2是本发明结构分解图；
图3是本发明结构分解图，是图2的A向视图；
图4是本发明阀球、阀座和阀杆的结构图。
具体实施方式
如图1至图4，一种强制密封球阀,包括阀座10、阀球和阀杆20，所述阀球包括阀球本体30和密封盖40，所述阀杆驱动所述阀球在开启位置和关闭位置之间往复转动；所述密封盖在所述阀球本体转动到关闭位置时从阀球本体伸出与阀座抱合。
所述阀球本体上设有与所述密封盖通过螺纹连接的螺旋驱动轮60，所述螺旋驱动轮旋转时通过螺纹顶起和收回所述密封盖。
所述阀杆驱动所述螺旋驱动轮旋转。
所述螺旋驱动轮设有齿盘62，所述阀杆通过密封驱动齿轮70驱动所述螺旋驱动轮旋转。
所述螺旋驱动轮与所述密封驱动齿轮之间设有中间传动齿轮80。
所述密封盖与所述阀球本体之间采用直线运动配合。
所述阀球本体从开启位置转动到关闭位置时停止转动，所述阀杆继续向关闭方向转动，驱动所述密封盖与所述阀座抱合。
所述阀球本体在开启位置和关闭位置之间的转动行程为90°。
阀球本体的下转轴设有90°的扇形凸起33，所述阀体下部转轴腔设有180°的限位凹槽13。
所述阀杆通过一个弹性元件50驱动所述阀球本体转动。
所述弹性元件是扭转弹簧。
所述阀杆的底端设有扭簧轴21，所述扭转弹簧套在所述扭簧轴上，所述阀杆和阀球本体分别设有扭簧脚孔(22，34)，所述扭簧的两个扭簧脚分别嵌入阀杆和阀球本体的扭簧脚孔中。
所述阀球在开启位置时，所述弹性元件对所述阀球本体施加使阀球本体向关闭位置方向转动的预驱动力。
所述密封盖在所述强制密封球阀的开启过程中向所述阀球本体缩回并与阀球本体接触。
实施例一：
如图1至图4，一种强制密封球阀,包括阀座10、阀球和阀杆20，所述阀球包括阀球本体30和密封盖40。
阀球安装在阀体11内，阀体设有上盖14，阀杆安装在上盖中。
阀球本体的外表面是一个球面，阀球本体设有阀球通孔35，阀球通孔的轴线垂直于阀球的转动轴线(即阀杆的转动轴线)，阀球在开启位置时阀球通孔与阀座连通，使介质经球阀流通。阀球本体设有顶压导孔31，本实施例中，顶压导孔是正六棱孔；顶压导孔的轴线X垂直于阀球的转动轴线Y、并通过阀球的球面中心，顶压导孔的轴线也垂直于阀球通孔的轴线。在阀球本体的下端设有下转轴32，下转轴与阀球的转动轴线同轴，下转轴的端头设有90°的扇形凸起33。在阀球本体的上端设有上转轴36，在上转轴的顶端设有扭簧脚孔34。在上转轴和顶压导孔之间设有中间传动轴37。阀球本体在设有顶压导孔的一面设有球缺面38，球缺面垂直于顶压导孔的轴线。
密封盖40的外形是直径与阀球本体相同的球缺形，包括球面43和球缺平面44，密封盖在球缺平面一侧的中心设有顶压螺孔42。密封盖与阀球本体之间采用直线运动配合，在顶压螺孔中设有导轴41，导轴是六棱轴，与阀球本体的顶压导孔31滑动配合、使密封盖沿顶压导孔的轴线往复移动。六棱轴使密封盖不能相对于阀球本体转动，以便螺旋驱动轮通过螺纹驱动密封盖。
阀球本体上安装有螺旋驱动轮60，螺旋驱动轮设有与密封盖的顶压螺孔配合的顶压螺柱61。螺旋驱动轮设有与顶压螺柱同轴的齿盘62，齿盘62是锥形齿。螺旋驱动轮通过一个压环63安装在阀球本体的一个螺柱轴39上。在阀杆上安装有一个密封驱动齿轮70，密封驱动齿轮是圆锥齿轮，密封驱动齿轮的中心设有多棱孔71。螺旋驱动轮与密封驱动齿轮之间设有中间传动齿轮80，中间传动齿轮安装在阀球本体的中间传动轴37上，中间传动齿轮也是圆锥齿轮，中间传动齿轮分别与密封驱动齿轮和螺旋驱动轮的齿盘啮合，使阀杆通过密封驱动齿轮驱动螺旋驱动轮旋转，螺旋驱动轮旋转时通过密封盖的顶压螺孔约束密封盖朝向阀座方向往复移动。
阀球安装在阀体11内，阀体设有与阀球本体的下转轴对应的下转轴腔12，下转轴腔设有与阀球本体下转轴的端头的扇形凸起33对应的，180度的限位凹槽13。使阀球本体的转动行程限制在90°。
阀杆的底端部分为多棱形23，密封驱动齿轮通过多棱孔71与阀杆底端形成驱动配合，使阀杆带动密封驱动齿轮同步旋转。
关阀时，阀杆通过一个扭转弹簧50驱动阀球本体转动。阀杆的连接端设有伸入阀杆内的扭簧轴21，扭转弹簧套在扭簧轴上，阀杆设有扭簧脚孔22，扭簧的两个扭簧脚分别嵌入阀杆的扭簧脚孔22和阀球本体的扭簧脚孔34中。扭转弹簧需要始终对阀球本体施加使阀球本体向关闭方向转动的作用力。因此阀球在开启位置时，扭转弹簧对阀球本体施加一个使 阀球本体向关闭位置方向转动的预驱动力。该预驱动力通过阀杆与密封驱动齿轮间的驱动配合，在中间齿轮的传动下使螺旋驱动齿轮驱动密封盖使之与阀球本体收紧，并形成平衡。
阀座设有与密封盖的球面配合的密封15，阀球在开启位置时，阀座的密封与阀球本体之间设有转动间隙。阀杆驱动阀球在开启位置和关闭位置之间往复转动。关阀时，阀杆通过扭转弹簧50驱动阀球本体转动。阀球本体从开启位置向关闭位置转动时，由于扭转弹簧对阀球本体的预驱动力，在开始阶段，阀球本体随阀杆同步转动，密封驱动齿轮与球阀本体之间没有相对转动，密封盖不会从阀球本体伸出。阀球本体转动到关闭位置时，由于扇形凸起33的限位作用停止转动，阀杆继续向关闭方向转动，驱动密封盖从阀球本体伸出，顶压阀座并与阀座抱合，密封盖的球面与阀座的密封接触，实现了强制密封关闭。
强制密封球阀在开启过程中，阀杆向开启方向转动、并带动密封驱动齿轮同步转动。由于扭转弹簧的作用力，阀球本体不会转动，密封驱动齿轮驱动密封盖向阀球本体缩回，密封盖的球缺平面44与阀球本体的球缺面38接触。阀杆继续向开启方向转动，由于密封盖已经与阀球本体接触，密封驱动齿轮不再继续相对于阀球本体转动，阀杆带动阀球本体和密封盖一同转动到开启位置。
为了不妨碍阀球的启闭操作，密封盖缩回后，密封盖的外轮廓不应超出阀球本体的整体球形外轮廓，本实施例中，密封盖的外轮廓与阀球本体的外轮廓形成一个整体球形外轮廓。
实施例二：
一种强制密封球阀，本实施例是实施例一所述的强制密封球阀的一种结构扩展。
本实施例的强制密封球阀在阀球本体上设有两个密封盖，同时与上游阀座和下游阀座抱合。
实施例三：
一种强制密封球阀，本实施例是实施例一所述的强制密封球阀的一种结构替换。
阀球本体上设有与密封盖通过螺纹连接的螺旋驱动轮，螺旋驱动轮转动时驱动所述密封盖从阀球本体伸出。
螺旋驱动轮设有螺孔，密封盖设有与螺旋驱动轮的螺孔配套的螺柱；螺旋驱动轮旋转时通过螺孔驱动密封盖朝向阀座往复移动。
实施例四：
一种强制密封球阀，本实施例是实施例一所述的强制密封球阀的一种结构替换。
密封盖设有导孔，导孔是棱孔；阀球本体设有导轴，导轴是与所述密封盖的棱孔滑 动配合的棱轴。
实施例五：
一种强制密封球阀，本实施例是实施例一或实施例四所述的强制密封球阀的一种结构替换。
本实施例中，阀球本体与密封盖通过键轴连接、使所述密封盖朝向阀座往复运动。
实施例六：
一种强制密封球阀，本实施例是实施例一或实施例四所述的强制密封球阀的一种结构替换。
本实施例中，阀球本体与密封盖通过花键轴连接、使所述密封盖朝向阀座往复运动。
实施例七：
一种强制密封球阀，本实施例是实施例一所述的强制密封球阀的一种结构替换。
阀杆的底端部分为花键，密封驱动齿轮设有与所述阀杆连接端配合的花键孔。密封驱动齿轮通过花键孔与阀杆底端形成驱动配合，使阀杆带动密封驱动齿轮同步旋转。
实施实例八：一种强制密封球阀，本实施例是实施例一的强制密封球阀的一种结构替换。
本实施例中，阀体采用侧装结构。
实施实例九：一种强制密封球阀，本实施例是实施例一的强制密封球阀的一种结构替换。
本实施例中，阀体采用全焊接结构。
本发明从实现密封的基本结构入手，均圆满地解决了目前各种强制密封球阀存在不足。如：在密封行程最后阶段的相对滑动摩擦，阀座法向密封分力不足，结构和体积庞大，部分设计需要使用液压系统，及部分设计存在的阀门开位时阀球组件受紊流影响等问题。
本发明采用转轴式阀球和固定式阀座设计。通过螺旋顶压机构将阀球总成的一部分(如果本发明应用于旋塞阀，也可以是旋塞总成的一部分)，也就是密封盖向阀座方向顶起并压紧来实现强制密封的技术。阀门的阀球本体的运动范围受阀体下转轴腔处精限位的限制，准确地停止于90度的开关位置；通过扭转弹簧的作用，密封盖在阀门除密封位置外的其他位置均与阀球本体收缩并锁紧在一起；从而实现球阀90度开关与阀座密封面无摩擦旋转。同时解决了一些当前设计存在的阀体组件受管道紊流损坏的弊端。阀球本体在对准关闭位置后，将受阀体下转轴腔精限位约束而停止转动，此时阀门操作的转动将通过集成在阀球本体上的一组齿轮机构传动来旋转螺旋驱动轮，从而平稳地顶压密封盖，使其与阀座同时抱合并压紧，实现强制的扭矩关阀。这种抱合过程是沿阀座密封面正垂直方向的同时抱合，因 此密封面间不会发生任何相对的转/滑动摩擦，避免了传统强制密封球阀关闭行程最后阶段密封面间的相对滑动摩擦。由于采用螺旋式旋转顶起原理，密封盖动作平稳可靠，容易实现密封盖和阀座密封面的配合精度。阀门结构紧凑能够符合标准的面到面大小，甚至可以更短。阀杆部分仅需要考虑角行程密封，结构简单，密封可靠；同时阀门开关行程时间短。
本发明的创新之处主要有以下几个方面：
平顺的密封盖螺旋顶压机构：
阀球本体、螺旋驱动轮、密封盖和阀座的轴向顺序位置关系。
阀门关闭动作在阀球本体和密封盖正对阀座时，螺旋驱动轮才会在关阀力矩的作用下旋转，由于密封盖受到棱轴的限制，不能随螺旋驱动轮转动，在螺旋驱动轮的引导下被均匀顶起，最终与阀座密封抱合而实现强制密封。
在这个过程中，螺旋顶压动作产生抱合压力正垂直于阀座密封面，因此不会叠加任何角行程运动，而发生滑动摩擦，密封抱合均匀可靠。
阀座和密封盖在开阀时同时脱开而具有均匀的自清洁性：开阀动作在扭转弹簧和开阀力矩的共同作用下，从螺旋驱动轮反向旋转开始，此时密封盖同样受到限旋六方柱的限制，不能随螺旋驱动轮转动，在螺旋旋转的引导下脱离与阀座的抱合，最终在扭转弹簧和开阀扭矩的共同作用下与阀球本体锁紧，这时阀球总成才会旋转直至阀门全开。
在这个过程中，密封盖与阀座的脱开是同时发生的，不叠加任何角行程运动，此时如果阀座周围沉积任何杂质，将会被介质均匀吹走，不留任何死角，从而起到自清洁的效果。
操作阀门开关的扭矩通过阀杆直接作用于密封驱动齿轮，在密封盖与阀座对准之前，齿轮组保持在锁定状态，不发生旋转，当密封盖与阀座对准后，阀杆旋转扭矩将首先驱动密封驱动齿轮旋转，通过中间传动齿轮将力矩传递给螺旋驱动轮使之直接旋转螺旋顶压机构实现强制密封。采用中间传动齿轮从中传递扭矩，可以大大减小阀球总成的体积，进而大大减小了整个阀门的体积。
扭转弹簧锁紧装置和阀球本体与密封驱动齿轮间的随动控制：结构简单可靠的扭转弹簧被安装在阀杆与阀球本体之间，阀杆下部多棱形与密封驱动齿轮内的多棱孔啮合形成驱动配合(也可以采用花键配合)，在齿轮组机构将密封盖与阀球本体完全收紧的同时，让阀球本体和阀杆及密封驱动齿轮间的扭力弹簧为它们施加恰当的锁紧扭矩，这样阀门在开关过程中密封盖与阀球本体即被锁紧，从而与阀座不接触实现阀球总成无摩擦旋转。关闭阀门时密封盖与阀座对准后，阀球本体的旋转将被限位阻止，阀杆继续传递关阀力矩将克服扭转弹 簧力矩使密封驱动齿轮相对阀球本体发生旋转，通过齿轮组机构将扭矩传递给密封盖，实现强制密封。
开阀时，扭转弹簧将施加扭力使阀球本体保持在关闭位置，而使得齿轮组机构传递力矩驱动密封盖与阀球本体先行收紧，扭转弹簧也将叠加扭矩将密封盖与阀球本体的收紧锁定。阀杆继续向开阀方向旋转，阀球总成将一起旋转直到阀门全开位置。扭转弹簧与阀杆、阀球本体和密封驱动齿轮间构成结构简单的随动控制，并使阀球总成在除全关位外处于收缩并锁紧状态，一方面使阀座与阀球总成无摩擦90度旋转，另一方面使阀门在全开位时，密封盖避免发生受介质紊流而产生的震动破坏。
阀门下转轴机械限位机构帮助实现阀球本体与密封驱动齿轮随动的分离：
阀球本体下转轴不同于普通转轴球阀，而是加工有90°的扇形凸起，阀体下转轴腔设有与阀球本体下转轴对应的180度的限位凹槽。阀门装配后，阀球本体的运动范围将被严格限定在90度的开关旋转范围。在阀球本体被限位在关闭位置时，阀杆关阀的力矩会克服扭转弹簧的力矩通过齿轮组旋转螺纹顶压机构实现强制密封。

Claims (14)

  1. 一种强制密封球阀，包括阀座、阀球和阀杆，其特征在于，所述阀球包括阀球本体和密封盖，所述阀杆驱动所述阀球在开启位置和关闭位置之间往复转动；所述密封盖在所述阀球本体转动到关闭位置时从阀球本体伸出与阀座抱合。
  2. 根据权利要求1所述的一种强制密封球阀，其特征在于，所述阀球本体上设有与所述密封盖通过螺纹连接的螺旋驱动轮，所述螺旋驱动轮旋转时通过螺纹顶起和收回所述密封盖。
  3. 根据权利要求2所述的一种强制密封球阀，其特征在于，所述阀杆驱动所述螺旋驱动轮旋转。
  4. 根据权利要求3所述的一种强制密封球阀，其特征在于，所述螺旋驱动轮设有齿盘，所述阀杆通过密封驱动齿轮驱动所述螺旋驱动轮旋转。
  5. 根据权利要求4所述的一种强制密封球阀，其特征在于，所述螺旋驱动轮与所述密封驱动齿轮之间设有中间传动齿轮。
  6. 根据权利要求1所述的一种强制密封球阀，其特征在于，所述密封盖与所述阀球本体之间采用直线运动配合。
  7. 根据权利要求1所述的一种强制密封球阀，其特征在于，所述阀球本体从开启位置转动到关闭位置时停止转动，所述阀杆继续向关闭方向转动，驱动所述密封盖与所述阀座抱合。
  8. 根据权利要求7所述的一种强制密封球阀，其特征在于，所述阀球本体的转动行程为90°。
  9. 根据权利要求8所述的一种强制密封球阀，其特征在于，阀球本体的下转轴设有90°的扇形凸起，所述阀体下部转轴腔设有180°的限位凹槽。
  10. 根据权利要求7所述的一种强制密封球阀，其特征在于，所述阀杆通过一个弹性元件驱动所述阀球本体转动。
  11. 根据权利要求10所述的一种强制密封球阀，其特征在于，所述弹性元件是扭转弹簧。
  12. 根据权利要求11所述的一种强制密封球阀，其特征在于，所述阀杆的底端设有扭簧轴，所述扭转弹簧套在扭簧轴上，所述阀杆和阀球本体分别设有扭簧脚孔，所述扭簧的扭簧脚分别嵌入阀杆和阀球本体的扭簧脚孔中。
  13. 根据权利要求10所述的一种强制密封球阀，其特征在于，所述弹性元件对所述阀球本体施加使阀球本体向关闭位置方向转动的预驱动力。
  14. 根据权利要求1所述的一种强制密封球阀，其特征在于，所述密封盖在所述强制密封球阀的开启过程中向所述阀球本体缩回并与阀球本体接触。
PCT/CN2017/080179 2016-05-26 2017-04-12 一种强制密封球阀 WO2017202151A1 (zh)

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