WO2021233076A1 - 截止阀 - Google Patents

截止阀 Download PDF

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Publication number
WO2021233076A1
WO2021233076A1 PCT/CN2021/089672 CN2021089672W WO2021233076A1 WO 2021233076 A1 WO2021233076 A1 WO 2021233076A1 CN 2021089672 W CN2021089672 W CN 2021089672W WO 2021233076 A1 WO2021233076 A1 WO 2021233076A1
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WO
WIPO (PCT)
Prior art keywords
valve
cavity
sealing
valve core
shut
Prior art date
Application number
PCT/CN2021/089672
Other languages
English (en)
French (fr)
Inventor
蒋光辉
Original Assignee
浙江盾安人工环境股份有限公司
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 浙江盾安人工环境股份有限公司 filed Critical 浙江盾安人工环境股份有限公司
Priority to JP2022565747A priority Critical patent/JP2023525672A/ja
Priority to KR1020227040731A priority patent/KR20230002946A/ko
Publication of WO2021233076A1 publication Critical patent/WO2021233076A1/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
    • 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
    • F16K1/36—Valve members
    • F16K1/38—Valve members of conical shape
    • 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
    • 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
    • F16K25/00—Details relating to contact between valve members and seat

Definitions

  • This application relates to the technical field of valves, and in particular to a shut-off valve.
  • the cut-off valve is also called the cut-off valve, which is one of the most widely used valves.
  • the reason why the globe valve is so popular is that the friction between the valve core and the valve cavity is small during the opening and closing process of the globe valve, which is relatively durable, has a small opening height, is easy to manufacture, and is convenient to maintain. It is not only suitable for medium and low pressure, but also for high pressure.
  • the stop valve is provided with a sealing step, and the edge of the sealing step is at a right angle, and the sealing step presses the sealing surface on the valve core of the stop valve to form a seal.
  • the sealing surface of the valve core is squeezed by the right-angle edge of the sealing step, and the sealing surface of the valve core produces a deep indentation.
  • the valve core is eccentric, it is easy to seal tightly, which will lead to cut-off. The valve is prone to leakage.
  • the present application provides a shut-off valve, including a valve seat and a valve core.
  • the valve seat is provided with a valve cavity
  • the valve cavity is provided with an inner conical surface and an inner cylindrical surface.
  • the end of the inner conical surface with a smaller diameter is connected with the inner cylindrical surface to form a ring of sealing edges.
  • the valve core has a sealing surface.
  • the valve core is movably arranged in the valve cavity to block or communicate with the valve cavity. When the valve core blocks the valve cavity, the sealing edge is pressed against the sealing surface to form a seal. And an included angle is formed between the sealing surface of the valve core and the inner tapered surface, the included angle is 1°-10°.
  • the shut-off valve mainly uses the sealing rib on the valve seat to compress the sealing surface on the valve core.
  • every point on the curved surface has a tangent plane, so every contact point between the sealing edge and the sealing surface has a corresponding tangent plane.
  • the force decomposition shows that the force of the sealing edge acting on the sealing surface can be decomposed into a force perpendicular to the tangent plane and a force parallel to the tangent plane.
  • the force parallel to the tangent plane will not cause the sealing surface to deform, and only the force perpendicular to the tangent plane will cause the sealing surface to deform.
  • the sealing surface is a conical surface or a spherical surface.
  • the sealing surface is a conical surface with a simple structure and easy processing. However, it is not limited to this, and the sealing surface may also be a spherical surface.
  • the included angle is 2°-5°.
  • the included angle between the sealing surface and the inner conical surface is 2°-5°, it is not easy to form indentations on the sealing surface, which ensures a good sealing performance between the valve core and the valve seat; and the processing of the stop valve is more difficult It is small, which is beneficial to reduce the processing cost of the shut-off valve.
  • the sealing rib divides the valve cavity into a first cavity and a second cavity.
  • the first cavity is located on the side of the valve cavity where the inner conical surface is provided
  • the second cavity is located on the side of the valve cavity where the inner cylindrical surface is provided.
  • the valve seat is provided with a first channel, a second channel and a third channel, and the first channel is in communication with the second cavity. Both the second channel and the third channel communicate with the first cavity. Since the valve core is movably arranged in the valve cavity to isolate or communicate with the valve cavity, and the sealing rib separates the valve cavity into the first cavity and the second cavity, the valve core can isolate or connect the first cavity and the second cavity. Two chambers.
  • valve seat is provided with a first channel
  • the first channel is connected with the second cavity
  • the valve seat is also provided with a second channel and a third channel
  • the second channel and the third channel are both connected with the first cavity. Therefore, by blocking the first cavity and the second cavity, the valve core can simultaneously block the communication between the second channel and the first channel, and block the communication between the third channel and the first channel.
  • the valve core communicates with the first cavity and the second cavity
  • the second channel and the third channel can communicate with the first channel at the same time.
  • the sealing surface is provided at one end of the valve core close to the sealing edge.
  • the sealing edge moves in the direction close to the sealing edge, the end of the valve core moves to the sealing edge to make the sealing surface close to the sealing edge, thereby forming a seal.
  • the sealing surface is arranged at the end of the valve core close to the sealing edge, the valve core does not need to be designed too long and the valve core does not need to move too long to form a seal, the sealing control is convenient, and materials are saved.
  • valve seat and the valve core are connected by threads, and the end of the valve core away from the sealing surface is provided with a screw hole.
  • the valve seat and the valve core are connected by a thread, and the connection is reliable and the stability is good, which is beneficial to the smooth movement of the valve core in the valve cavity to block or communicate with the valve cavity.
  • the end of the valve core away from the sealing surface is provided with a rotating hole, and the control tool can be inserted into the rotating hole to cooperate with the rotating hole, thereby rotating the valve core and moving the valve core.
  • the setting of the screw hole greatly facilitates the connection of the control tool, and the operation of controlling the movement of the spool through the control tool is also easier.
  • the screw hole is a hexagonal screw hole.
  • the hexagonal screw hole can be used with an Allen key. During the process of screwing the hexagonal screw hole with the Allen key, there are six contact surfaces between the hexagonal screw hole and the Allen key, so the hexagonal screw hole The force is balanced, so that the valve core is not easily damaged.
  • a sealing ring is provided between the valve core and the valve seat.
  • an annular groove is provided on the outer peripheral side of the valve core, and the sealing ring is provided in the groove.
  • An annular groove is provided on the outer peripheral side of the valve core, and the sealing ring is arranged in the groove.
  • the sealing ring can be directly installed in the groove, which is convenient to install; and when the valve core moves relative to the valve seat, the sealing ring will not be displaced due to friction, thus ensuring the good sealing performance of the sealing ring.
  • the sealing ring is a rubber piece. The rubber piece has strong elasticity and can form a good seal when being squeezed. At the same time, the rubber parts have a high degree of wear resistance, and the valve core is not easy to wear the sealing ring after multiple movements. In addition, the price of rubber parts is lower, which is beneficial to reduce the production cost of the shut-off valve.
  • Figure 1 is a cross-sectional view of a shut-off valve according to an embodiment of the application
  • Fig. 2 is an enlarged view of the structure of a part A of the shut-off valve according to an embodiment of the application.
  • Valve seat 11. Valve cavity; 111, first cavity; 112, second cavity; 113, inner conical surface; 114, inner cylindrical surface; 115, sealing edge; 12.
  • a component when referred to as being "installed on” another component, it can be directly installed on the other component or a centered component may also exist. When a component is considered to be “installed on” another component, it can be directly installed on another component or a centered component may exist at the same time. When a component is considered “fixed” to another component, it can be directly fixed to the other component or there may be a centered component at the same time.
  • FIG. 1 is a cross-sectional view of a shut-off valve according to an embodiment of the application
  • FIG. 2 is an enlarged view of a partial structure of the shut-off valve according to an embodiment of the application.
  • the shut-off valve includes a valve seat 1 and a valve core 2.
  • the valve seat 1 is provided with a valve cavity 11, and the valve cavity 11 is provided with an inner tapered surface 113 and an inner cylindrical surface 114.
  • the smaller diameter end of the inner tapered surface 113 is connected with the inner cylindrical surface 114 to form a ring of sealing rib 115 .
  • the valve core 2 has a sealing surface 21.
  • the valve core 2 is movably arranged in the valve cavity 11 to block or communicate with the valve cavity 11.
  • an included angle a is formed between the sealing surface 21 of the valve core 2 and the inner tapered surface 113, and the included angle a is 1°-10°.
  • the shut-off valve mainly uses the sealing rib 115 on the valve seat 1 to press the sealing surface 21 on the valve core 2.
  • each point on the curved surface has a tangent plane, so each contact point between the sealing rib 115 and the sealing surface 21 has a corresponding tangent plane.
  • the force decomposition that the force of the sealing edge 115 acting on the sealing surface 21 can be decomposed into a force perpendicular to the tangent plane and a force parallel to the tangent plane.
  • the force parallel to the tangent plane will not cause the sealing surface 21 to deform, and only the force perpendicular to the tangent plane will cause the sealing surface 21 to deform.
  • the contact area between the inner tapered surface 113 of the valve seat 1 and the sealing surface 21 of the valve core 2 will increase sharply, and the pressure on the sealing surface 21 will decrease sharply. It is small to prevent further deformation at the sealing surface 21 of the valve core 2. Therefore, the sealing rib 115 is not easy to produce a large indentation on the sealing surface 21, and the shut-off valve is not easy to leak.
  • the sealing rib 115 and the sealing surface 21 are line-sealed.
  • the sealing surface 21 is a conical surface or a spherical surface.
  • the sealing surface 21 is a tapered surface with a simple structure and easy processing. However, it is not limited to this, and the sealing surface 21 may also be a spherical surface.
  • the included angle a is 2°-5°.
  • indentation is not easily formed on the sealing surface 21, which ensures a good sealing performance between the valve core 2 and the valve seat 1; and, The processing of the shut-off valve is less difficult, which is beneficial to reduce the processing cost of the shut-off valve.
  • the sealing rib 115 divides the valve cavity 11 into a first cavity 111 and a second cavity 112.
  • the first cavity 111 is located on the side of the valve cavity 11 where the inner conical surface 113 is provided
  • the second cavity 112 is located on the side of the valve cavity 11 where the inner cylindrical surface 114 is provided.
  • the valve seat 1 is provided with a first passage 12, a second passage 13 and a third passage 14, and the first passage 12 is in communication with the second cavity 112. Both the second channel 13 and the third channel 14 communicate with the first cavity 111.
  • valve core 2 Since the valve core 2 is movably arranged in the valve cavity 11 to block or communicate with the valve cavity 11, and the sealing rib 115 separates the valve cavity 11 into the first cavity 111 and the second cavity 112, the valve core 2 can block Or connect the first cavity 111 and the second cavity 112. Because the valve seat 1 is provided with a first passage 12, the first passage 12 is in communication with the second cavity 112, and the valve seat 1 is also provided with a second passage 13 and a third passage 14, both of the second passage 13 and the third passage 14 It communicates with the first cavity 111. Therefore, the valve core 2 can block the communication between the second passage 13 and the first passage 12 and the communication between the third passage 14 and the first passage 12 by blocking the first cavity 111 and the second cavity 112 at the same time. When the valve core 2 communicates with the first cavity 111 and the second cavity 112, the second channel 13 and the third channel 14 can communicate with the first channel 12 at the same time.
  • the sealing surface 21 is provided at one end of the valve core 2 close to the sealing rib 115.
  • the sealing edge 115 When the valve core 2 moves toward the sealing edge 115, the end of the valve core 2 moves to the sealing edge 115 to make the sealing surface 21 close to the sealing edge 115, thereby forming a seal.
  • the sealing surface 21 is provided at one end of the valve core 2 close to the sealing rib 115, so the valve core 2 does not need to be designed too long and the valve core 2 does not need to move too long to form a seal, which is convenient for sealing control and saves materials.
  • valve seat 1 and the valve core 2 are connected by threads, and the end of the valve core 2 away from the sealing surface 21 is provided with a screw hole 22.
  • the valve seat 1 and the valve core 2 are connected by a thread, and the connection is reliable and the stability is good, which facilitates the smooth movement of the valve core 2 in the valve cavity 11 to block or communicate with the valve cavity 11.
  • the end of the valve core 2 away from the sealing surface 21 is provided with a rotating hole 22, and the control tool can be inserted into the rotating hole 22 to cooperate with the rotating hole 22 to rotate the valve core 2 to move the valve core 2.
  • the setting of the screw hole 22 greatly facilitates the connection of the control tool, and the operation of controlling the movement of the spool 2 through the control tool is also easier.
  • the screw hole 22 is a hexagonal screw hole 22.
  • the hexagonal screw hole 22 can be used with an Allen key. During the process of screwing the hexagonal screw hole 22 with the Allen key, there are six contact surfaces between the hexagonal screw hole 22 and the Allen key, so the six sides The force of the shaped screw hole 22 is balanced, so that the valve core 2 is not easily damaged.
  • a sealing ring 3 is provided between the valve core 2 and the valve seat 1.
  • the connection sealing performance of the valve core 2 and the valve seat 1 can be greatly enhanced, and it is ensured that when the valve core 2 moves, there will be no occurrence between the valve core 2 and the valve seat 1. Leakage, and can reduce the wear of the valve core 2 and the valve cavity 11, and improve the service life of the shut-off valve.
  • an annular groove 23 is provided on the outer peripheral side of the valve core 2, and the sealing ring 3 is provided in the groove 23.
  • An annular groove 23 is provided on the outer peripheral side of the valve core 2 and the sealing ring 3 is arranged in the groove 23.
  • valve seat 1 is provided with an internal thread
  • the outer circumference of the valve core 2 is provided with an external thread threadedly connected with the internal thread, and the external thread is located between the groove 23 and the sealing surface 21 of the valve core 2.
  • the sealing ring 3 is a rubber piece.
  • the rubber piece has strong elasticity and can form a good seal when being squeezed.
  • the rubber parts have a high degree of wear resistance, and the valve core 2 is not easy to wear the sealing ring 3 after multiple movements.
  • the price of rubber parts is lower, which is beneficial to reduce the production cost of the shut-off valve.

Abstract

一种截止阀，该截止阀包括阀座(1)和阀芯(2)。阀座(1)设有阀腔(11)，阀腔(11)设有内锥形面(113)和内柱形面(114)，内锥形面(113)直径较小的一端和内柱形面(114)相连并形成一圈密封棱(115)。阀芯(2)具有密封面(21)。阀芯(2)活动地设于阀腔(11)内以隔断或连通阀腔(11)。当阀芯(2)隔断阀腔(11)时，密封棱(115)压紧于密封面(21)以形成密封。且阀芯(2)的密封面(21)与内锥形面(113)之间形成一夹角a，夹角a为1°-10°。

Description

截止阀
相关申请
本申请要求2020年5月18日申请的，申请号为202020848411.7，发明名称为“截止阀”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及阀门技术领域，特别是涉及一种截止阀。
背景技术
截止阀也叫截门阀，是使用最广泛的一种阀门之一。截止阀之所以广受欢迎，是由于截止阀开闭过程中阀芯与阀腔之间摩擦力小，比较耐用，开启高度不大，制造容易，维修方便，不仅适用于中低压，而且适用于高压。
在现有技术中，截止阀设有密封台阶，且密封台阶的边缘呈直角，密封台阶压紧截止阀阀芯上的密封面形成密封。密封时，通过密封台阶的直角处棱边挤压阀芯的密封面，阀芯的密封面上产生较深的压痕，使用过程中，当阀芯发生偏心时容易密封不严，进而导致截止阀容易发生泄漏。
发明内容
有鉴于此，有必要提供一种截止阀，解决现有技术中密封台阶在密封面上留下很深的凹陷，阀芯偏心引起密封不严进而导致截止阀容易发生泄漏的问题。
本申请提供一种截止阀，包括阀座和阀芯。阀座设有阀腔，阀腔设有内 锥形面和内柱形面，内锥形面直径较小的一端和内柱形面相连并形成一圈密封棱。阀芯具有密封面。阀芯活动地设于阀腔内以隔断或连通阀腔。当阀芯隔断阀腔时，密封棱压紧于密封面以形成密封。且阀芯的密封面与内锥形面之间形成一夹角，夹角为1°-10°。
本申请提供的截止阀，主要是利用阀座上的密封棱压紧阀芯上的密封面。通常曲面上的每一个点处都具有一个切平面，因此密封棱与密封面的每一个接触点都具有相应的切平面。而由力的分解可知，密封棱作用于密封面上的力能够分解为垂直于切平面的力和平行于切平面的力。但是平行于切平面的力不会导致密封面产生形变，只有垂直于切平面的力才会导致密封面产生形变。
进一步地，由公式P＝F/S可知，其中P代表压强，F代表压力，S代表接触面积。在相同的压力作用下，接触面积越大，压强越小。当密封棱对密封面施加压力时，阀芯的密封面会产生微小的形变。但是距离密封面较近的内锥形面与密封面之间的夹角为1°-10°，内锥形面与密封面趋向于贴合。因此，在阀芯的密封面产生微小形变的瞬间，阀座的内锥形面与阀芯的密封面的接触面积会急剧增大，使密封面受到的压强急剧减小，阻止阀芯的密封面处进一步产生形变。因而密封棱不易在密封面上产生较大的压痕，阀芯产生偏心时不容易形成缝隙，截止阀也不易产生泄漏。
于本申请一实施例中，密封棱与密封面之间为线密封。
于本申请一实施例中，密封面为锥面或球面。密封面为锥面，结构简单，容易加工。然而不限于此，密封面也可以为球面。
于本申请一实施例中，夹角为2°-5°。密封面与内锥形面之间的夹角为2°-5°时，密封面上不易形成压痕，保证了阀芯与阀座之间的良好密封性能； 并且，截止阀的加工难度较小，有利于降低截止阀的加工成本。
于本申请一实施例中，密封棱将阀腔分隔成第一腔体和第二腔体。第一腔体位于阀腔设有内锥形面的一侧，第二腔体位于阀腔设有内柱形面的一侧。阀座设有第一通道、第二通道以及第三通道，第一通道与第二腔体连通。第二通道和第三通道均与第一腔体连通。由于阀芯活动地设于阀腔内以隔断或连通阀腔，并且，密封棱将阀腔分隔成第一腔体和第二腔体，因此，阀芯能够隔断或连通第一腔体和第二腔体。又因为阀座设有第一通道，第一通道与第二腔体连通，阀座还设有第二通道和第三通道，第二通道与第三通道均与第一腔体连通。因此，阀芯通过隔断第一腔体和第二腔体，能够同时隔断第二通道与第一通道的连通，以及隔断第三通道与第一通道的连通。阀芯连通第一腔体和第二腔体时，能够同时使第二通道和第三通道与第一通道的连通。
于本申请一实施例中，密封面设于阀芯靠近密封棱的一端。当阀芯朝靠近密封棱的方向移动时，阀芯的端部移动至密封棱处即可使得密封面靠近密封棱，进而形成密封。密封面设于阀芯靠近密封棱的一端，则阀芯不需要设计得太长且阀芯不需要移动太长的距离即可形成密封，密封控制方便，且节省材料。
于本申请一实施例中，阀座与阀芯之间通过螺纹连接，且阀芯远离密封面的一端设有旋孔。阀座与阀芯之间通过螺纹连接，连接可靠，稳定性好，有利于阀芯在阀腔内平稳移动，以隔断或连通阀腔。阀芯远离密封面的一端设有旋孔，则控制工具可以插入旋孔与旋孔配合，从而旋动阀芯，使阀芯移动。设置旋孔大大方便了控制工具的连接，且通过控制工具控制阀芯移动的操作也更为简便。
于本申请一实施例中，旋孔为六边形旋孔。六边形旋孔可配合内六角扳 手使用，在内六角扳手旋拧六边形旋孔的过程中，六边形旋孔与内六角扳手之间有六个接触面，因此六边形旋孔受力均衡，从而不易损坏阀芯。
于本申请一实施例中，阀芯与阀座之间设有密封圈。通过在阀芯和阀座之间设置密封圈，可极大地增强阀芯与阀座的连接密封性，保证阀芯移动时阀芯与阀座之间不会发生泄露，并且能够减小阀芯与阀腔的磨损，提高截止阀的使用寿命。
于本申请一实施例中，阀芯外周侧设有环形的凹槽，密封圈设于凹槽内。通过在阀芯外周侧设置环形的凹槽，且将密封圈设在凹槽内。安装时，可以直接将密封圈安装于凹槽内，安装方便；并且，阀芯相对阀座移动时，密封圈不会由于摩擦力的作用而发生位移，从而保证了密封圈的良好密封性能。进一步地，密封圈为橡胶件。橡胶件具有较强的弹性，被挤压时能形成良好的密封性。同时橡胶件的耐磨程度较高，阀芯多次移动也不易磨损密封圈。并且橡胶件的价格较低，有利于降低截止阀的生产成本。
附图说明
图1为本申请一实施例的截止阀的剖视图；
图2为本申请一实施例的截止阀的A处结构放大图。
主要元件标号说明：1、阀座；11、阀腔；111、第一腔体；112、第二腔体；113、内锥形面；114、内柱形面；115、密封棱；12、第一通道；13、第二通道；14、第三通道；2、阀芯；21、密封面；22、旋孔；23、凹槽；3、密封圈。
如下具体实施方式将结合上述附图进一步说明本申请。
具体实施方式
下面将结合本申请实施方式中的附图，对本申请实施方式中的技术方案进行清楚、完整地描述，显然，所描述的实施方式仅仅是本申请一部分实施方式，而不是全部的实施方式。基于本申请中的实施方式，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施方式，都属于本申请保护的范围。
需要说明的是，当组件被称为“装设于”另一个组件，它可以直接装设在另一个组件上或者也可以存在居中的组件。当一个组件被认为是“设置于”另一个组件，它可以是直接设置在另一个组件上或者可能同时存在居中组件。当一个组件被认为是“固定于”另一个组件，它可以是直接固定在另一个组件上或者可能同时存在居中组件。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。本文中在本申请的说明书中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本申请。本文所使用的术语“或/及”包括一个或多个相关的所列项目的任意的和所有的组合。
请参阅图1和图2，图1为本申请一实施例的截止阀的剖视图，图2为本申请一实施例的截止阀的局部结构放大图。该截止阀包括阀座1和阀芯2。阀座1设有阀腔11，阀腔11设有内锥形面113和内柱形面114，内锥形面113直径较小的一端和内柱形面114相连并形成一圈密封棱115。阀芯2具有密封面21。阀芯2活动地设于阀腔11内以隔断或连通阀腔11。当阀芯2隔断阀腔11时，密封棱115压紧于密封面21以形成密封。且阀芯2的密封面21与内锥形面113之间形成一夹角a，夹角a为1°-10°。
在本实施例中，如图1和图2所示，该截止阀主要是利用阀座1上的密封棱115压紧阀芯2上的密封面21。通常曲面上的每一个点处都具有一个切平面，因此密封棱115与密封面21的每一个接触点都具有相应的切平面。而由力的分解可知，密封棱115作用于密封面21上的力能够分解为垂直于切平面的力和平行于切平面的力。但是平行于切平面的力不会导致密封面21产生形变，只有垂直于切平面的力才会导致密封面21产生形变。
进一步地，由公式P＝F/S可知，其中P代表压强，F代表压力，S代表接触面积。在相同的压力作用下，接触面积越大，压强越小。当密封棱115对密封面21施加压力时，阀芯2的密封面21会产生微小的形变。但是距离密封面21较近的内锥形面113与密封面21之间的夹角a为1°-10°，内锥形面113与密封面21趋向于贴合。因此，在阀芯2的密封面21产生微小形变的瞬间，阀座1的内锥形面113与阀芯2的密封面21的接触面积会急剧增大，使密封面21受到的压强急剧减小，阻止阀芯2的密封面21处进一步产生形变。因而密封棱115不易在密封面21上产生较大的压痕，截止阀也不易产生泄漏。
在一实施例中，密封棱115与密封面21之间为线密封。
在一实施例中，密封面21为锥面或球面。密封面21为锥面，结构简单，容易加工。然而不限于此，密封面21也可以为球面。
在一实施例中，夹角a为2°-5°。密封面21与内锥形面113之间的夹角a为2°-5°时，密封面21上不易形成压痕，保证了阀芯2与阀座1之间的良好密封性能；并且，截止阀的加工难度较小，有利于降低截止阀的加工成本。
在一实施例中，如图1所示，密封棱115将阀腔11分隔成第一腔体111 和第二腔体112。第一腔体111位于阀腔11设有内锥形面113的一侧，第二腔体112位于阀腔11设有内柱形面114的一侧。阀座1设有第一通道12、第二通道13以及第三通道14，第一通道12与第二腔体112连通。第二通道13和第三通道14均与第一腔体111连通。由于阀芯2活动地设于阀腔11内以隔断或连通阀腔11，并且，密封棱115将阀腔11分隔成第一腔体111和第二腔体112，因此，阀芯2能够隔断或连通第一腔体111和第二腔体112。又因为阀座1设有第一通道12，第一通道12与第二腔体112连通，阀座1还设有第二通道13和第三通道14，第二通道13与第三通道14均与第一腔体111连通。因此，阀芯2通过隔断第一腔体111和第二腔体112，能够同时隔断第二通道13与第一通道12的连通，以及隔断第三通道14与第一通道12的连通。阀芯2连通第一腔体111和第二腔体112时，能够同时使第二通道13和第三通道14与第一通道12的连通。
在一实施例中，如图1所示，密封面21设于阀芯2靠近密封棱115的一端。当阀芯2朝靠近密封棱115的方向移动时，阀芯2的端部移动至密封棱115处即可使得密封面21靠近密封棱115，进而形成密封。密封面21设于阀芯2靠近密封棱115的一端，则阀芯2不需要设计得太长且阀芯2不需要移动太长的距离即可形成密封，密封控制方便，且节省材料。
在一实施例中，如图1所示，阀座1与阀芯2之间通过螺纹连接，且阀芯2远离密封面21的一端设有旋孔22。阀座1与阀芯2之间通过螺纹连接，连接可靠，稳定性好，有利于阀芯2在阀腔11内平稳移动，以隔断或连通阀腔11。阀芯2远离密封面21的一端设有旋孔22，则控制工具可以插入旋孔22与旋孔22配合，从而旋动阀芯2，使阀芯2移动。设置旋孔22大大方便了控制工具的连接，且通过控制工具控制阀芯2移动的操作也更为简便。
在一实施例中，如图1所示，旋孔22为六边形旋孔22。六边形旋孔22可配合内六角扳手使用，在内六角扳手旋拧六边形旋孔22的过程中，六边形旋孔22与内六角扳手之间有六个接触面，因此六边形旋孔22受力均衡，从而不易损坏阀芯2。
在一实施例中，如图1所示，阀芯2与阀座1之间设有密封圈3。通过在阀芯2和阀座1之间设置密封圈3，可极大地增强阀芯2与阀座1的连接密封性，保证阀芯2移动时阀芯2与阀座1之间不会发生泄露，并且能够减小阀芯2与阀腔11的磨损，提高截止阀的使用寿命。
在一实施例中，如图1所示，阀芯2外周侧设有环形的凹槽23，密封圈3设于凹槽23内。通过在阀芯2外周侧设置环形的凹槽23，且将密封圈3设在凹槽23内。安装时，可以直接将密封圈3安装于凹槽23内，安装方便；并且，阀芯2相对阀座1移动时，密封圈3不会由于摩擦力的作用而发生位移，从而保证了密封圈3的良好密封性能。
具体地，阀座1上设有内螺纹，阀芯2外周设有与该内螺纹螺纹连接的外螺纹，该外螺纹位于在凹槽23与阀芯2的密封面21之间。
进一步地，密封圈3为橡胶件。橡胶件具有较强的弹性，被挤压时能形成良好的密封性。同时橡胶件的耐磨程度较高，阀芯2多次移动也不易磨损密封圈3。并且橡胶件的价格较低，有利于降低截止阀的生产成本。
以上所述实施方式的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施方式中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
本技术领域的普通技术人员应当认识到，以上的实施方式仅是用来说明本申请，而并非用作为对本申请的限定，只要在本申请的实质精神范围内， 对以上实施方式所作的适当改变和变化都落在本申请要求保护的范围内。

Claims (10)

  1. 一种截止阀，其特征在于，包括：
    阀座，设有阀腔，所述阀腔设有内锥形面和内柱形面，所述内锥形面直径较小的一端和所述内柱形面相连并形成一圈密封棱；以及
    阀芯，具有密封面；
    所述阀芯活动地设于所述阀腔内以隔断或连通所述阀腔，当所述阀芯隔断所述阀腔时，所述密封棱压紧于所述密封面以形成密封，且所述阀芯的密封面与所述内锥形面之间形成一夹角a，所述夹角a为1°-10°。
  2. 根据权利要求1所述的截止阀，其中，所述密封棱与所述密封面之间为线密封。
  3. 根据权利要求1所述的截止阀，其中，所述密封面为锥面或球面。
  4. 根据权利要求1所述的截止阀，其中，所述夹角a为2°-5°。
  5. 根据权利要求1所述的截止阀，其中，所述密封棱将所述阀腔分隔成第一腔体和第二腔体，所述第一腔体位于所述阀腔设有内锥形面的一侧，所述第二腔体位于所述阀腔设有内柱形面的一侧；
    所述阀座设有第一通道、第二通道以及第三通道，所述第一通道与所述第二腔体连通；所述第二通道和所述第三通道均与所述第一腔体连通。
  6. 根据权利要求1所述的截止阀，其中，所述密封面设于所述阀芯靠近所述密封棱的一端。
  7. 根据权利要求6所述的截止阀，其中，所述阀座与所述阀芯之间通过螺纹连接，且所述阀芯远离所述密封面的一端设有旋孔。
  8. 根据权利要求7所述的截止阀，其中，所述旋孔为六边形旋孔。
  9. 根据权利要求1所述的截止阀，其中，所述阀芯与所述阀座之间设有密 封圈。
  10. 根据权利要求9所述的截止阀，其中，所述阀芯外周侧设有环形的凹槽，所述密封圈设于所述凹槽内。
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