WO2020034355A1 - 保压筒下端密封结构 - Google Patents

保压筒下端密封结构 Download PDF

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Publication number
WO2020034355A1
WO2020034355A1 PCT/CN2018/108976 CN2018108976W WO2020034355A1 WO 2020034355 A1 WO2020034355 A1 WO 2020034355A1 CN 2018108976 W CN2018108976 W CN 2018108976W WO 2020034355 A1 WO2020034355 A1 WO 2020034355A1
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WO
WIPO (PCT)
Prior art keywords
valve
sealing
groove
seal
valve seat
Prior art date
Application number
PCT/CN2018/108976
Other languages
English (en)
French (fr)
Inventor
高明忠
谢和平
陈领
张志龙
张泽天
张茹
鲁义强
李聪
何志强
华夏
明传剑
彭高友
陆彤
Original Assignee
四川大学
深圳大学
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Application filed by 四川大学, 深圳大学 filed Critical 四川大学
Publication of WO2020034355A1 publication Critical patent/WO2020034355A1/zh

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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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/226—Shaping or arrangements of the sealing
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F16K1/226—Shaping or arrangements of the sealing
    • F16K1/2263—Shaping or arrangements of the sealing the sealing being arranged on the valve seat
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/42—Valve seats
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/46—Attachment of sealing rings

Definitions

  • the invention relates to the technical field of valves, and in particular to a sealing structure at the lower end of a pressure-holding cylinder.
  • the upper end of the pressure maintaining cylinder is generally sealed with a piston, and the lower end of the pressure maintaining cylinder is usually sealed with a ball valve or a flap valve.
  • the ball valve has a complicated structure and takes up a lot of space, which limits the diameter of the core to be drilled.
  • the ball valve requires high processing technology, and when the pressure is high, the liquid in the pressure retaining tube will seep from the gap between the ball valve and the core tube. High pressure cannot be maintained.
  • the existing flap valve has a simple structure and can maintain a high pressure, its flap is a fixed shape, cannot be deformed, and the cooperation success rate is low.
  • the invention aims to provide a sealing structure at the lower end of a pressure-holding cylinder.
  • the flapper valve is used to realize the lower end sealing.
  • the flapper of the flapper valve has a deformation ability, a high cooperation success rate and a reliable sealing performance.
  • the sealing structure at the lower end of the pressure-maintaining cylinder includes a core cylinder, a rig outer cylinder, and a chain-type flap valve.
  • the chain-type flap valve includes a valve seat and a chain valve disc.
  • the valve seat is coaxially mounted on the drilling rig.
  • On the inner wall of the outer cylinder, one end of the valve disc is movably connected to the outer side wall of the upper end of the valve seat, and the top of the valve seat has a valve port sealing surface matching the valve disc;
  • the valve flap includes an elastic sealing ring, an elastic connecting bar, a sealing member and a plurality of locking bars arranged in parallel in sequence; the elastic connecting bar connects all the locking bars in series and the elastic sealing ring ties all the locking bars together to form an integrated structure.
  • valve flap When the core barrel is located in the valve seat, the valve flap opens 90 ° and is located between the core barrel and the drill rig's outer barrel; when the core barrel is lifted up to a certain height, the valve flap returns to the top surface of the valve seat and the valve port
  • the sealing surfaces are in sealing contact, and two adjacent locking bars are in sealing contact.
  • the lock bar is parallel to the axis of the valve seat.
  • valve disc when the valve disc is in sealing contact with the valve seat, the valve disc has a circular flat plate structure.
  • one side of the other lock bars has a wedge-shaped through groove, and the opposite side has a convex portion adapted to the wedge-shaped through groove;
  • One of the two lock bars at the head and the tail is provided with a wedge-shaped through groove, and the other lock bar is provided with a convex portion;
  • the convex part of one of the two adjacent lock bars is wedgedly matched with the wedge-shaped through groove of the other lock bar, and the seal is provided between the groove wall and the convex portion of the wedge-shaped through groove.
  • the elastic seal ring is located in the middle of the valve disc, the seal is located above the elastic seal ring, and the elastic connection bar is located above the seal.
  • one of the groove walls of the wedge-shaped through groove is provided with a limiting step surface one, and the convex portion of the corresponding other lock bar has a limiting step surface two adapted to the limiting step surface;
  • the limiting step surface 1 is in conflict with the limiting step surface 2 and the limiting step surface 1 is located outside the limiting step surface 2; the limiting step surface 1 and the limiting step surface 2 are elastic Under the seal.
  • the wedge-shaped through groove is V-shaped, U-shaped or trapezoidal.
  • the seal is installed on the groove wall of the wedge-shaped through groove.
  • the seal includes a sealing strip for providing a soft seal and a metal seal for providing a hard seal.
  • the sealing member further includes graphite, the sealing strip is located between the graphite and the metal sealing member, and the graphite is located inside the sealing strip.
  • valve flap is movably connected to the valve seat through a spring leaf.
  • the spring leaf includes a rotating shaft and an elastic spring piece.
  • the outer side wall of the top of the valve seat has a rotating shaft receiving groove adapted to the rotating shaft.
  • the rotating shaft is installed in the rotating shaft receiving groove.
  • the outer surface of the valve flap is provided with a shrapnel accommodating groove for accommodating the shrapnel, and the shrapnel is installed in the shrapnel accommodating groove.
  • a seal ring is provided between the outer wall of the valve seat and the inner wall of the outer barrel of the drilling rig.
  • the present invention has the following beneficial effects:
  • the invention adopts a chain-lock flap valve to realize the lower end sealing.
  • the chain-lock flap is deformed and hidden between the core barrel and the outer barrel of the drill, which saves space and eliminates the core diameter when drilling.
  • the chain-shaped valve disc automatically closes.
  • the valve disc has a strong deformation ability, and can automatically adjust the sealing fit position.
  • the cooperation success rate is high, the sealing performance is reliable, and the valve
  • the valve has a reverse self-locking characteristic when it is under pressure.
  • FIG. 1 is a schematic structural diagram of the present invention when a valve flap is opened
  • FIG. 2 is a partially enlarged view at A in FIG. 1; FIG.
  • FIG. 3 is a three-dimensional perspective view of the chain-lock flap valve when the core barrel is located in the valve seat;
  • Figure 4 is a top view of the valve flap in Figure 3;
  • FIG. 5 is a partially enlarged view at A in FIG. 4;
  • FIG. 6 is a partially enlarged view at A in FIG. 5; FIG.
  • FIG. 7 is a three-dimensional perspective view of a valve flap in a natural state
  • FIG. 8 is a partial schematic view of the present invention when the valve flap is closed
  • FIG. 9 is a three-dimensional perspective view of the chain mail flap valve when the valve flap is closed.
  • valve flap 10 is a three-dimensional perspective view of the valve flap under pressure sealing
  • Figure 11 is a front view of the valve flap under pressure sealing
  • the sealing structure at the lower end of the pressure-holding cylinder disclosed in the present invention includes a core cylinder 5, an outer cylinder 6 of a drilling rig, and a chain locker flap valve.
  • the chain locker flap valve includes a valve seat 1 and The valve disc 2 of the chain type, the valve seat 1 is coaxially installed on the inner wall of the outer cylinder 6 of the drilling rig, one end of the valve disc 2 is movably connected with the outer wall of the upper end of the valve seat 1, and the valve seat 1 has a valve port matching the valve disc 2
  • the sealing surface 11 and the valve port sealing surface 11 are tapered surfaces.
  • the valve flap 2 includes an elastic sealing ring 24, an elastic connecting bar 22, a sealing member 23, and a plurality of locking bars 21 arranged in parallel in sequence. There are at least three lock bars 21, and the number of lock bars 21 is determined according to the size of the sealing surface of the valve port.
  • the elastic connecting strip 22 connects all the locking strips 21 in series, and all the locking strips 21 are hooped together by the elastic sealing ring 24 to form an integrated structure.
  • the locking strip 21 has a card slot adapted to the elastic sealing ring 24. In the card slot, a seal 23 is provided between two adjacent lock bars 21. Since the plurality of lock bars 21 arranged in parallel are connected in series by the elastic connecting bar 22, they are fastened by the elastic sealing ring 24.
  • valve flap 2 or the lock strip 21 When the valve flap 2 or the lock strip 21 is subjected to external force, the lock strip 21 and the elastic seal ring 24 can be elastically deformed, and then two adjacent lock strips 21 can be relatively displaced and rotated. Therefore, the valve flap 2 can occur under external force. deformation.
  • valve flap 2 when the core barrel 5 is lifted up to a certain height, the valve flap 2 returns to the top surface of the valve seat 1 and comes into contact with the sealing surface 11 of the valve port, and two adjacent locking bars 21 are in sealing contact. Thereby blocking the medium.
  • the outer wall of the valve seat 1 is provided with an annular groove 12 for installing a seal ring, and a seal ring 7 is installed in the annular groove 12 to realize the sealing cooperation between the valve seat 1 and the outer cylinder 6 of the drill.
  • the other lock bar 21 has a wedge-shaped through groove 211 on one side and a convex portion 212 adapted to the wedge-shaped through groove 211 on the opposite side.
  • One of the two locking bars 21 is provided with a wedge-shaped through groove 211, and the other locking bar 21 is provided with a convex portion 212; the convex portion of one of the two adjacent locking bars 21 212 is trapped in the wedge-shaped through groove 211 of the other lock bar 21.
  • the wedge-shaped through groove 211 is V-shaped or trapezoidal, and the seal 23 is mounted on the groove wall of the wedge-shaped through groove 211.
  • the seal 23 includes a seal 231 for providing a soft seal, a metal seal 232 for providing a hard seal, and two auxiliary seals 234.
  • the sealing strip 231 is installed between two auxiliary sealing members 234, and the auxiliary sealing member 234 fixes the position of the sealing strip 231 and protects the sealing strip 231 at the same time.
  • the seal 23 further includes graphite 233.
  • the seal 231 is located between the graphite 233 and the metal seal 232.
  • the graphite 233 is located inside the seal 231.
  • the graphite material can reduce the sliding resistance between the lock bars 21. Because the groove wall of the wedge-shaped through groove 211 has a certain inclination, as shown in Figs. 8, 9, and 10, when closed, the rear locking bar 21 first contacts the graphite 233 portion of the front locking bar 21, and the graphite reduces friction, which is beneficial to the closing movement.
  • the first to play a sealing role is the sealing strip 231, the softer sealing strip 231 first meets the initial sealing conditions, the sealing strip 231 is long, the cross-section is circular, and its length is the same as the two adjacent locking strips 21 Contact length is consistent. As the pressure increases, the outer metal seal 233 also seals.
  • valve flap 2 When the valve flap 2 is in sealing contact with the valve port sealing surface 11, the elastic seal ring 24 is located in the middle of the valve flap 2, the seal 23 is located above the elastic seal ring 24, and the elastic connection bar 22 is located above the seal 23. Due to the pressure of the elastic connecting strip 22 and the elastic sealing ring 24, the valve disc 2 tends to become a flat structure in the natural state, but due to the blocking effect of the seal 23, the valve disc 2 is a micro-arc plate in the natural state. Structure, as shown in Figure 7. However, when the valve disc 2 is in pressure contact with the valve seat 1 under pressure, as shown in FIG. 8-11, two adjacent locking bars 21 press the seal 23 to achieve sealing contact, and the valve disc 2 is deformed into a circular flat plate structure.
  • the sealing member 23 is installed on one of the groove walls of the wedge-shaped through groove 211, and the other groove wall of the wedge-shaped through groove 211 has a limited step surface 213, and the corresponding convex portion of the other lock bar 21 212 has a limiting step surface 214 adapted to the limiting step surface 213.
  • the limiting step surface 213 and the limiting step surface 214 are located below the elastic sealing ring 24, the limiting step surface 213 is in contact with the limiting step surface 214 and the position is limited.
  • the step surface 213 is located outside the limiting step surface 214 to prevent the convex portion 212 from exiting from the wedge-shaped through groove 211 when the valve flap 2 is under pressure, so that it can reversely lock itself under pressure.
  • the valve flap 2 is movably connected to the valve seat 1 through a spring leaf 3.
  • the spring leaf 3 includes a rotating shaft 31 and an elastic spring piece 32.
  • the outer wall of the top end of the valve seat 1 is adapted to the rotating shaft 31.
  • the rotating shaft 31 is installed in the rotating shaft accommodating groove.
  • the outer surface of the valve flap 2 is provided with an elastic plate accommodating groove 25 for accommodating the elastic piece 32.
  • the elastic piece 32 is a curved steel piece, and the curved steel piece is clamped at the elastic piece receiving groove 25.
  • the curved steel piece can be straightened under the external force, and the curved surface can be flat and completely conform to the elastic piece receiving groove 25 on the outer surface of the valve disc 2. fit.
  • valve flap 2 is hinged to the outer wall of the upper end of the valve seat 1 through a pin shaft and a torsion spring.
  • a core catcher 9 is provided on the inner wall of the lower end of the core barrel 5
  • a piston 10 is mounted on the upper portion of the core barrel 5
  • a drill bit 8 is connected to the lower end of the outer barrel 6 of the drilling rig.
  • the lower end of the core barrel 5 passes through the valve seat 1 and extends to the bottom of the outer barrel 6 of the rig. Due to the force of the core barrel 5, the valve flap 2 is opened 90 degrees, and the in-situ water environment can invade the core barrel 5; For the drilling of the drill bit 8, the core enters the core barrel 5 from the lower end of the core barrel 5 and is grasped by the core catcher 9.
  • the core barrel 5 is pulled upward, and the core catcher 9 and the core rise together with the core barrel 5.
  • the core cylinder 5 is lifted up to a certain height, and the bottom of the core cylinder 5 passes over the valve disc 2, the elastic piece 32 sandwiched between the outer cylinder 6 of the drilling rig and the valve disc 2 releases the elastic force, and the elastic force of the valve disc 2 on the elastic piece 32 is elastic. It reverses with its own gravity, realizes sealing cooperation with valve seat 1 and closes the valve, so as to seal the lower end of core barrel 5 and prevent fluid loss in core barrel 5; valve disc 2 and valve seat 1 under internal liquid pressure The tighter the contact, the greater the internal pressure and the better the sealing effect.
  • the invention adopts a chain-lock flap valve to realize the lower end sealing.
  • the chain-lock flap is deformed and hidden between the core barrel and the outer barrel of the drill, which saves space and eliminates the core diameter when drilling.
  • the chain-shaped valve disc automatically closes.
  • the valve disc has a strong deformation ability and can automatically adjust the sealing fit position.
  • the cooperation success rate is high, the sealing performance is reliable, and the valve
  • the valve has a reverse self-locking characteristic when it is under pressure.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)
  • Check Valves (AREA)

Abstract

一种保压筒下端密封结构，包括岩芯筒（5）、钻机外筒（6）和锁子甲式的翻板阀，翻板阀包括阀座（1）和锁子甲式的阀瓣（2），阀座（1）安装在钻机外筒（6）内壁上，阀瓣（2）与阀座（1）上端活动连接，阀瓣（2）包括弹性密封圈（24）、弹性连接条（22）、密封件（23）和多个依次排列的锁条（21）；弹性连接条（22）将所有锁条（21）串连并由弹性密封圈（24）将所有锁条（21）箍在一起形成整体结构，相邻两个锁条（21）间设有密封件（23）。

Description

保压筒下端密封结构 技术领域
本发明涉及阀门技术领域，尤其涉及保压筒下端密封结构。
背景技术
目前，在保压取芯领域，保压筒上端一般采用活塞密封，保压筒下端通常采用球阀密封或者翻板阀密封。球阀结构比较复杂，空间占据大，限制了钻取岩芯的直径，球阀加工工艺要求高，且当压力较大时，保压筒里面的液体会从球阀与岩心筒之间的缝隙渗出，不能维持较高的压力；现有的翻板阀，虽然结构简单，能够维持较高的压力，但其阀瓣为固定形状，不能变形，配合成功率低。
发明内容
本发明旨在提供保压筒下端密封结构，采用翻板阀实现下端密封，其翻板阀的阀瓣具有形变能力，配合成功率高，密封性能可靠。
为达到上述目的，本发明采用的技术方案如下：
保压筒下端密封结构，包括岩芯筒、钻机外筒和锁子甲式翻板阀,锁子甲式翻板阀包括阀座和锁子甲式的阀瓣，阀座同轴安装在钻机外筒内壁上，阀瓣一端与阀座上端外侧壁活动连接，阀座顶部有与阀瓣匹配的阀口密封面；
阀瓣包括弹性密封圈、弹性连接条、密封件和多个依次平行排列的锁条；弹性连接条将所有锁条串连并由弹性密封圈将所有锁条箍在一起形成整体结构，锁条上有与弹性密封圈适配的卡槽，弹性密封圈装在卡槽中，相邻两个锁条间设有密封件；
当岩芯筒位于阀座中时，阀瓣开启90°且位于岩芯筒与钻机外筒之间；当将岩芯筒向上提升至一定高度时，阀瓣回到阀座顶面与阀口密封面密封接触，相邻两个锁条密封接触。
其中，当阀瓣开启90°时，锁条与阀座的轴线平行。
进一步的，当阀瓣与阀座密封接触时，阀瓣为圆形平板结构。
其中，除首尾两个锁条外，其余锁条的一面有楔形通槽，相对的另一面有与楔形通槽适配的凸部；
首尾两个锁条中的其中一个锁条上设有楔形通槽，另一个锁条上设有凸部；
相邻两个锁条中的其中一个锁条的凸部与另一个锁条的楔形通槽楔形配合，密封件设于楔形通槽的槽壁与凸部之间。
进一步的，当阀瓣与阀口密封面密封接触时，弹性密封圈位于阀瓣中部，密封件位于弹性密封圈上方，弹性连接条位于密封件上方。
进一步的，楔形通槽其中一个槽壁上有限位台阶面一，对应的另一个锁条的凸部上有与限位台阶一面适配的限位台阶面二；
当阀瓣与阀座密封接触时，限位台阶面一与限位台阶面二相抵触且限位台阶面一位于限位台阶面二外侧，限位台阶面一和限位台阶面二位于弹性密封圈下方。
进一步的，楔形通槽为V形、U形或梯形。
其中，密封件安装在楔形通槽的槽壁上。
进一步的，密封件包括用于提供软密封的密封条和用于提供硬密封的金属密封件。
优选地，密封件还包括石墨,密封条位于石墨与金属密封件之间，石墨位于密封条内侧。
进一步的，阀瓣通过弹簧片活动连接在阀座上，弹簧片包括转轴和具有弹性的弹片，阀座顶端外侧壁有与转轴相适配的转轴容置槽，转轴装在转轴容置槽中，阀瓣外表面有容纳弹片的弹片容置槽，弹片装在弹片容置槽中。
进一步的，阀座的外壁与钻机外筒的内壁间设有密封圈。
与现有技术相比，本发明具有以下有益效果：
本发明采用锁子甲式翻板阀实现下端密封，阀门开启时，锁子甲式阀瓣发生形变并隐藏于岩芯筒与钻机外筒之间，节约空间，可消除对钻取岩芯直径的限制；当将岩芯筒向上提升至一定高度时，锁子甲式的阀瓣自动关闭,该阀瓣形变能力强，可自动调整密封配合位置，配合成功率高，密封性能可靠，且阀瓣保压受力时具有反向自锁特性。
附图说明
图1是阀瓣开启时本发明的结构示意图；
图2是图1中A处的局部放大图；
图3是岩芯筒位于阀座中时锁子甲式翻板阀的三维立体图；
图4是图3中阀瓣的俯视图；
图5是图4中A处的局部放大图；；
图6是图5中A处的局部放大图；
图7是自然状态下阀瓣的三维立体图；
图8是阀瓣关闭时本发明的局部示意图；
图9是阀瓣关闭时锁子甲式翻板阀的三维立体图；
图10是阀瓣受压密封时的三维立体图；
图11是阀瓣受压密封时的主视图；
图中：1-阀座、2-阀瓣、3-弹簧片、5-岩芯筒、6-钻机外筒、7-密封圈、8-钻头、9-捕芯器、10-活塞、11-阀口密封面、12-环形槽、21-锁条、22-弹性连接条、23-密封件、24-弹性密封圈、25-弹片容置槽、31-转轴、32-弹片、211-楔形通槽、212-凸部、213-限位台阶面一、214-限位台阶面二、231-密封条、232-金属密封件、233-石墨、234-辅助密封件。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图，对本发明进行进一步详细说明。
如图1-11所示，本发明公开的保压筒下端密封结构，包括岩芯筒5、钻机外筒6和锁子甲式翻板阀,锁子甲式翻板阀包括阀座1和锁子甲式的阀瓣2，阀座1同轴安装在钻机外筒6内壁上，阀瓣2一端与阀座1上端外侧壁活动连接，阀座1顶部有与阀瓣2匹配的阀口密封面11，阀口密封面11为锥面。
阀瓣2包括弹性密封圈24、弹性连接条22、密封件23和多个依次平行排列的锁条21。锁条21至少有3个，锁条21的数量根据阀口密封面的大小确定。弹性连接条22将所有锁条21串连并由弹性密封圈24将所有锁条21箍在一起形成整体结构，锁条21上有与弹性密封圈24适配的卡槽，弹性密封圈24装在卡槽中，相邻两个锁条21间设有密封件23。由于并行排列的多个锁条21由弹性连接条22串联，由弹性密封圈24紧箍。当阀瓣2或锁条21受外力时可使锁条21和弹性密封圈24发生弹性形变，继而相邻两个锁条21可发生相对位移及转动，因而阀瓣2在受外力时可发生形变。
如图1、2、3所示，当岩芯筒5位于阀座1中时，由于岩心筒5的作用力，使阀瓣2开启90度，由于岩心筒5与钻机外筒6的双面作用力使相邻两个锁条21被撑开，阀瓣2发生形变最终隐藏在岩心 筒5与钻机外筒6之间，且阀瓣2的内表面与岩心筒5的外侧壁完全贴合，节约空间，可消除对钻取岩芯直径的限制。如图3、4所示，此时，锁条21与阀座1的轴线平行。
如图8、9所示，当将岩芯筒5向上提升至一定高度时，阀瓣2回到阀座1顶面与阀口密封面11密封接触，相邻两个锁条21密封接触，从而阻断介质。阀座1外壁有用于安装密封圈的环形槽12，环形槽12中装有密封圈7实现阀座1与钻机外筒6之间的密封配合。
如图4、5、6所示，除首尾两个锁条21外，其余锁条21的一面有楔形通槽211，相对的另一面有与楔形通槽211适配的凸部212。首尾两个锁条21中的其中一个锁条21上设有楔形通槽211，另一个锁条21上设有凸部212；相邻两个锁条21中的其中一个锁条21的凸部212陷于另一个锁条21的楔形通槽211中。
楔形通槽211为V形或梯形等，密封件23安装在楔形通槽211的槽壁上。密封件23包括用于提供软密封的密封条231、用于提供硬密封的金属密封件232以及两个辅助密封件234。密封条231安装两个辅助密封件234之间，辅助密封件234对密封条231进行位置固定，同时对密封条231进行保护。
密封件23还包括石墨233,密封条231位于石墨233与金属密封件232之间，石墨233位于密封条231内侧，石墨材料可减小锁条21间的滑动阻力。由于楔形通槽211的槽壁具有一定倾斜度，如图8、9、10所示，闭合时，后边的锁条21首先接触前边锁条21的石墨233部分，石墨减小摩擦，利于闭合运动；然后首先起到密封作用的是密封条231，较软的密封条231首先满足初始密封条件，密封条231是长条的，横截面为圆形，其长度与相邻两个锁条21的接触长度一致。随着压力增大时，外侧的金属密封件233也实现密封。
当阀瓣2与阀口密封面11密封接触时，弹性密封圈24位于阀瓣2中部，密封件23位于弹性密封圈24上方，弹性连接条22位于密封件23上方。由于弹性连接条22以及弹性密封圈24的压力，自然状态下，阀瓣2有变为平板结构的趋势，但是由于密封件23的阻挡作用，使阀瓣2在自然状态下为微弧形板结构，如图7所示。但当阀瓣2受压与阀座1密封接触时，如图8-11所示，相邻两个锁条21挤压密封件23实现密封接触，阀瓣2变形为圆形平板结构。
如图5、6所示，密封件23安装在楔形通槽211的其中一个槽壁上，楔形通槽211另一个槽壁上有限位台阶面一213，对应的另一个 锁条21的凸部212上有与限位台阶一面213适配的限位台阶面二214。当阀瓣2与阀座1密封接触时，限位台阶面一213和限位台阶面二214位于弹性密封圈24下方，限位台阶面一213与限位台阶面二214相抵触且限位台阶面一213位于限位台阶面二214外侧，以防止阀瓣2受压时凸部212从楔形通槽211中退出，使其在保压受力时能够反向自锁。
如图3、9所示，阀瓣2通过弹簧片3活动连接在阀座1上，弹簧片3包括转轴31和具有弹性的弹片32，阀座1顶端外侧壁有与转轴31相适配的转轴容置槽，转轴31装在转轴容置槽中，阀瓣2外表面有容纳弹片32的弹片容置槽25，弹片32装在弹片容置槽25中。弹片32为曲线型钢片，曲线型钢片卡在弹片容置槽25处，在外力作用下曲线型钢片能够伸直，其曲面可以变为平面并与阀瓣2外表面的弹片容置槽25完全贴合。
在另一个实施方式中，阀瓣2通过销轴和扭力弹簧与阀座1上端外侧壁铰接。
如图1所示，岩芯筒5下端内壁设有捕芯器9，岩芯筒5上部装有活塞10，钻机外筒6下端连接钻头8，如图1所示，岩心钻取阶段，岩芯筒5下端穿过阀座1并延伸到钻机外筒6底部，由于岩心筒5的作用力，使阀瓣2开启90度，此时原位水环境可以侵入岩芯筒5内；随着钻头8的钻进，岩芯从岩芯筒5下端进入岩芯筒5内并由捕芯器9抓紧。
钻取结束后，向上提拉岩芯筒5，捕芯器9和岩芯随岩芯筒5一起上升。如图8所示，当将岩心筒5向上提升到一定高度，其底部越过阀瓣2时，夹在钻机外筒6与阀瓣2之间的弹片32释放弹力，阀瓣2在弹片32弹力和自身重力作用下反转，与阀座1实现密封配合，阀门关闭，从而实现岩芯筒5下端的密封，防止岩芯筒5内液体流失；阀瓣2在内部液体压力下与阀座1接触的越来越紧密，内部压力越大密封效果越好。
本发明采用锁子甲式翻板阀实现下端密封，阀门开启时，锁子甲式阀瓣发生形变并隐藏于岩芯筒与钻机外筒之间，节约空间，可消除对钻取岩芯直径的限制；当将岩芯筒向上提升至一定高度时，锁子甲式的阀瓣自动关闭,该阀瓣形变能力强，可自动调整密封配合位置，配合成功率高，密封性能可靠，且阀瓣保压受力时具有反向自锁特性。
当然，本发明还可有其它多种实施方式，在不背离本发明精神及 其实质的情况下，熟悉本领域的技术人员可根据本发明作出各种相应的改变和变形，但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。

Claims (10)

  1. 保压筒下端密封结构，其特征在于:包括岩芯筒(5)、钻机外筒(6)和锁子甲式翻板阀,锁子甲式翻板阀包括阀座(1)和锁子甲式的阀瓣(2)，阀座(1)同轴安装在钻机外筒(6)内壁上，阀瓣(2)一端与阀座(1)上端外侧壁活动连接，阀座(1)顶部有与阀瓣(2)匹配的阀口密封面(11)；
    阀瓣(2)包括弹性密封圈(24)、弹性连接条(22)、密封件(23)和多个依次平行排列的锁条(21)；弹性连接条(22)将所有锁条(21)串连并由弹性密封圈(24)将所有锁条(21)箍在一起形成整体结构，锁条(21)上有与弹性密封圈(24)适配的卡槽，弹性密封圈(24)装在卡槽中，相邻两个锁条(21)间设有密封件(23)；
    当岩芯筒(1)位于阀座(31)中时，阀瓣(2)开启90°且位于岩芯筒(5)与钻机外筒(6)之间；当将岩芯筒(5)向上提升至一定高度时，阀瓣(2)回到阀座(1)顶面与阀口密封面(11)密封接触，相邻两个锁条(21)密封接触。
  2. 根据权利要求1所述的保压筒下端密封结构，其特征在于：当阀瓣(2)开启90°时，锁条(21)与阀座(1)的轴线平行。
  3. 根据权利要求1或2所述的保压筒下端密封结构，其特征在于：当阀瓣(2)与阀座(1)密封接触时，阀瓣(2)为圆形平板结构。
  4. 根据权利要求1所述的保压筒下端密封结构，其特征在于：除首尾两个锁条(21)外，其余锁条(21)的一面有楔形通槽(211)，相对的另一面有与楔形通槽(211)适配的凸部(212)；
    首尾两个锁条(21)中的其中一个锁条(21)上设有楔形通槽(211)，另一个锁条(21)上设有凸部(212)；
    相邻两个锁条(21)中的其中一个锁条(21)的凸部(212)与另一个锁条(21)的楔形通槽(211)楔形配合，密封件(23)设于楔形通槽(211)的槽壁与凸部(212)之间。
  5. 根据权利要求4所述的保压筒下端密封结构，其特征在于：当阀瓣(2)与阀口密封面(11)密封接触时，弹性密封圈(24)位于阀瓣(2)中部，密封件(23)位于弹性密封圈(24)上方，弹性连接条(22)位于密封件(23)上方。
  6. 根据权利要求5所述的保压筒下端密封结构，其特征在于：楔形通槽(211)其中一个槽壁上有限位台阶面一(213)，对应的另一个锁条(21)的凸部(212)上有与限位台阶面一(213)适配的限位 台阶面二(214)；
    当阀瓣(2)与阀座(1)密封接触时，限位台阶面一(213)和限位台阶面二(214)位于弹性密封圈(24)下方,限位台阶面一(213)与限位台阶面二(214)相抵触且限位台阶面一(213)位于限位台阶面二(214)外侧。
  7. 根据权利要求4、5或6所述的保压筒下端密封结构，其特征在于：密封件(23)安装在楔形通槽(211)的槽壁上。
  8. 根据权利要求1、2、4、5或6所述的保压筒下端密封结构，其特征在于：密封件(23)包括用于提供软密封的密封条(231)和用于提供硬密封的金属密封件(232)。
  9. 根据权利要求1或2所述的保压筒下端密封结构，其特征在于：阀瓣(2)通过弹簧片(3)活动连接在阀座(1)上，弹簧片(3)包括转轴(31)和具有弹性的弹片(32)，阀座(1)顶端外侧壁有与转轴(31)相适配的转轴容置槽，转轴(31)装在转轴容置槽中，阀瓣(2)外表面有容纳弹片(32)的弹片容置槽(25)，弹片(32)装在弹片容置槽(25)中。
  10. 根据权利要求1所述的保压筒下端密封结构，其特征在于：阀座(1)的外壁与钻机外筒(6)的内壁间设有密封圈(7)。
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