WO2015024468A1 - 自密封蝶阀 - Google Patents

自密封蝶阀 Download PDF

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Publication number
WO2015024468A1
WO2015024468A1 PCT/CN2014/084158 CN2014084158W WO2015024468A1 WO 2015024468 A1 WO2015024468 A1 WO 2015024468A1 CN 2014084158 W CN2014084158 W CN 2014084158W WO 2015024468 A1 WO2015024468 A1 WO 2015024468A1
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WO
WIPO (PCT)
Prior art keywords
ring
valve plate
valve
self
elastic sealing
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2014/084158
Other languages
English (en)
French (fr)
Inventor
张同虎
李元水
陈新国
陈波
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANDONG LEDE MACHINERY Co Ltd
Original Assignee
SHANDONG LEDE MACHINERY Co Ltd
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=49691930&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2015024468(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by SHANDONG LEDE MACHINERY Co Ltd filed Critical SHANDONG LEDE MACHINERY Co Ltd
Priority to PL14838495T priority Critical patent/PL3037696T3/pl
Priority to JP2016530342A priority patent/JP6216455B2/ja
Priority to KR1020167002455A priority patent/KR101814559B1/ko
Priority to US14/912,707 priority patent/US9995399B2/en
Priority to EP14838495.1A priority patent/EP3037696B1/en
Priority to ES14838495T priority patent/ES2770586T3/es
Publication of WO2015024468A1 publication Critical patent/WO2015024468A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F16K1/2261—Shaping or arrangements of the sealing the sealing being arranged on the valve member
    • 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
    • F16K1/222—Shaping of the valve member

Definitions

  • the invention relates to a self-sealing butterfly valve. Background technique
  • the existing midline butterfly valve comprises a valve body, the valve body is provided with a fluid passage, and the fluid passage is provided with a valve plate having an outer surface coated with an elastic sealing layer, and the upper part of the valve is connected with a driving shaft rotatably connected to the valve body, the valve The lower part of the plate is rotatably connected to a support shaft connected to the valve body. Opening and closing are performed by driving the shaft to drive the valve plate around the axis of the drive shaft and the support shaft, and the elastic sealing layer covering the outer peripheral surface of the valve plate is caused to be generated by the valve plate and the inner wall of the fluid passage. Elastic deformation to achieve a seal when closed.
  • the centerline butterfly valve of the above structure mainly has the following disadvantages: First, the rigidity of the valve body and the valve shaft is relatively high. If the rigidity of the valve body is insufficient, deformation occurs under the action of fluid pressure, causing the valve body to contact with the valve plate. If the valve shaft is not rigid enough, under the action of the fluid pressure, the valve plate will be displaced along the axial direction of the fluid passage, causing the valve to leak; in order to increase the rigidity of the valve body and the valve shaft, it is necessary to increase The amount of material used for the valve body and the valve shaft results in a large weight of the valve body and the valve shaft, resulting in high manufacturing costs.
  • One of the technical problems to be solved by the present invention is to provide a self-sealing method which has low rigidity requirements on the valve body and the valve shaft, can effectively reduce the weight of the valve body and the valve shaft, reduces the manufacturing cost, and has a good sealing effect.
  • Butterfly valve is a self-sealing method which has low rigidity requirements on the valve body and the valve shaft, can effectively reduce the weight of the valve body and the valve shaft, reduces the manufacturing cost, and has a good sealing effect.
  • the second technical problem to be solved by the present invention is to provide a self-sealing butterfly valve with a small opening and closing torque, which can further reduce the wear of the elastic sealing layer, long service life of the valve and suitable for opening and closing of the pipeline system. .
  • the self-sealing butterfly valve includes a valve body, the valve body is provided with a fluid passage, and the fluid passage is provided with a valve plate having an outer surface coated with an elastic sealing layer.
  • the upper part of the valve is connected to the drive shaft rotatably connected to the valve body, and the lower part of the valve plate is
  • the support shaft connected to the valve body is rotatably connected, and the structural feature is that the elastic sealing layers on the outer edges of the both end faces of the valve plate are axially convex, thereby forming two ring lips which can be engaged with the inner wall of the fluid passage;
  • the ring lip gradually thickens from the outside to the inside, so that the inner ring surface of the ring lip is an inclined surface.
  • the upper part of the valve is provided with an upper expansion portion for connection with the drive shaft
  • the lower part of the valve plate is provided for connection with the support shaft.
  • the lower portion of the upper inflated portion is disposed opposite to the upper surface of the lower inflated portion and the area of the lower surface of the upper inflated portion is larger than the area of the upper surface of the inflated portion.
  • the self-sealing butterfly valve includes a valve body, the valve body is provided with a fluid passage, the fluid passage is provided with a valve plate, and the upper portion of the valve is rotatably connected to the valve body
  • the upper drive shaft is rotatably connected, and the lower portion of the valve plate is rotatably connected with the support shaft connected to the valve body, and the valve plate is provided with a rim which can cover the outer peripheral surface of the valve plate and the outer edges of the valve plate.
  • the outer edges of the end faces of the elastic sealing ring are axially convex, thereby forming two ring lips which can be adhered to the inner wall of the fluid passage; the ring lip is gradually thickened from the outside to the inside, thereby The inner annulus of the ring lip is an inclined surface.
  • the upper part of the valve is provided with an upper expansion portion for connection with the drive shaft
  • the lower part of the valve plate is provided for connection with the support shaft
  • the lower portion of the upper inflated portion is disposed opposite to the upper surface of the lower inflated portion and the area of the lower surface of the upper inflated portion is larger than the area of the upper surface of the inflated portion.
  • the elastic sealing ring comprises a ring sleeve for covering the outer peripheral surface of the valve plate, and the opposite sides of the ring sleeve are respectively provided with a driving shaft mounting hole and a supporting shaft mounting hole, and the ring
  • Two flaps are arranged on the inner wall surface of the sleeve, and two flaps and a loop sleeve enclose a mounting ring groove for the valve plate set, and the outer sides of the two flaps form the two end faces of the elastic sealing ring.
  • the ring lip is disposed on an outer edge of the baffle, and each end of the elastic sealing ring is provided with a rib.
  • the elastic sealing ring is partially prevented from falling off or completely falling off when the valve plate is rotated, and a retaining ring is connected to both end faces of the valve plate, and the inner end faces of the two retaining rings are connected.
  • the outer peripheral surfaces of the two retaining rings are inclined surfaces that can abut against the inner ring surface, and the inner end surface of the retaining ring is provided with a positioning ring groove. The ribs can be inserted into the positioning ring groove.
  • the ring of the retaining ring is provided with a plurality of bolting holes and a plurality of threaded holes, and the retaining ring is penetrated
  • the bolt insertion hole is bolted to the valve plate, and the screw hole is screwed with a screw that abuts against the valve plate.
  • the retaining ring is a split structure composed of a plurality of unit sheets, and each unit piece body is provided with at least two bolt-forming holes and one threaded hole.
  • the retaining ring is prevented from affecting the effect of the ring lip on the inner wall of the fluid passage under fluid pressure, and the thickness of the retaining ring is smaller than the axial length of the ring lip.
  • the elastic sealing layer is a rubber layer or a polytetrafluoroethylene layer
  • the elastic sealing ring is a rubber sealing ring or a Teflon sealing ring.
  • the self-sealing butterfly valve of the above structure the valve plate with the outer surface coated with the elastic sealing layer or the valve plate with the elastic sealing ring on the outer edge and the fluid passage ⁇ with a slight interference fit can satisfy the low pressure sealing of the fluid, with the fluid passage
  • the pressure of the inner fluid is gradually increased, and the fluid squeezes the lip of the ring. Since the inner ring surface of the ring lip is an inclined surface, the ring lip is pressed by the fluid to generate a radial component force, so that the ring lip closely contacts the inner wall of the fluid passage, forming Self-sealing, the sealing effect of the present invention is good.
  • the ring lip can achieve self-sealing under the action of fluid pressure, even if the valve body and the valve shaft are slightly deformed, the ring lip will closely adhere to the inner wall of the fluid passage under the action of fluid pressure, and therefore, the valve is satisfied.
  • the rigidity requirement can be appropriately reduced, that is, the wall thickness of the valve body and the diameter of the valve shaft are appropriately reduced, so as to save materials and reduce production cost.
  • the pressure on the upper surface of the large portion of the lower expansion is larger than that of the fluid, that is, there is a pressure difference, which can effectively offset the self-weight of the valve plate, so that the valve plate can obtain the effect of floating toward the drive shaft, thereby not only reducing the
  • the wear of the elastic sealing layer caused by the weight of the valve plate prolongs the service life of the valve, and the opening and closing torque can be reduced, so that the opening of the valve is flexible.
  • the invention has the following advantages: 1.
  • the self-sealing and sealing effect can be achieved; 2.
  • the rigidity of the valve body and the valve shaft is not high, and the wall thickness of the valve body and the diameter of the valve shaft can be reduced.
  • the material is saved and the production cost is reduced; 3.
  • the opening and closing torque is small, the opening and closing is flexible, the wear is small, the valve has a long service life; 4.
  • the pipeline system can be used for opening and closing frequently.
  • Figure 1 is a schematic view showing the structure of a first self-sealing butterfly valve
  • Figure 2 is a schematic structural view of a valve plate
  • Figure 3 is a cross-sectional view taken along line AA of Figure 2;
  • Figure 4 is a cross-sectional view taken along line BB of Figure 2;
  • Figure 5 is a cross-sectional view taken along line C-C of Figure 2;
  • Figure 6 is a schematic view showing the structure of a second self-sealing butterfly valve
  • Figure 7 is a view taken in the direction of D in Figure 6;
  • Figure 8 is a schematic structural view of the valve plate shown in Figure 6;
  • Figure 9 is a cross-sectional view taken along line E-E of Figure 8.
  • Figure 10 is a cross-sectional view taken along line F-F of Figure 8.
  • Figure 11 is a schematic structural view of the elastic sealing ring shown in Figure 6;
  • Figure 12 is a cross-sectional view taken along line G-G of Figure 11;
  • Figure 13 is a cross-sectional view taken along line H-H of Figure 11;
  • Figure 14 is a schematic structural view of the retaining ring shown in Figure 6;
  • Figure 15 is a cross-sectional view taken along line I-I of Figure 14;
  • Figure 16 is a cross-sectional view taken along line J-J of Figure 14. detailed description
  • the self-sealing butterfly valve of the first configuration of the present invention comprises a valve body 1 having a fluid passage 2 therein, and a fluid passage 2 having a valve plate 4 having an outer surface covered with an elastic sealing layer 3
  • the elastic sealing layer 3 is a rubber layer or a polytetrafluoroethylene layer.
  • the upper portion of the valve plate 4 is dynamically connected to the drive shaft 5 rotatably coupled to the valve body 1.
  • the lower portion of the valve plate 4 is rotatably coupled to the support shaft 6 connected to the valve body.
  • the rotation of the drive shaft 5 drives the valve plate 4 to rotate to realize the valve. Opening and closing.
  • the drive shaft 5 and the support shaft 6 and the valve body 1 are uniformly assembled by a sealing means, which is known in the art.
  • the drive shaft 5 and the support shaft 6 can be fitted with a seal ring to realize the valve body 1 Sealed fit.
  • the elastic sealing layers 3 on the outer edges of the both end faces of the valve plate 4 are axially convex, thereby forming two ring lips 7 which can be attached to the inner wall of the fluid passage 2; the ring lips 7 are outwardly oriented.
  • the inner portion is gradually thickened so that the inner annular surface 8 of the ring lip 7 is an inclined surface.
  • the upper portion of the valve plate 4 is provided with an upper enlarged portion 9 for connection with the drive shaft 5, and the lower portion of the valve plate 4 is provided with a lower enlarged portion 10 for connection with the support shaft 6, and a lower surface and a lower enlarged portion 10 of the upper enlarged portion 9.
  • the upper surface is oppositely disposed and the area of the lower surface of the upper enlarged portion 9 is larger than the area of the upper surface of the lower expanded portion 10.
  • the outer surface of the valve plate is completely covered by the elastic sealing layer.
  • This structure is suitable for a small-sized midline butterfly valve, because the valve plate size is small and it is easy to be completely covered by the elastic sealing layer.
  • the size of the valve plate is large, it is difficult to completely cover the valve plate with the elastic sealing layer, that is, the self-sealing butterfly valve of the first structure described above is difficult Make a large size midline butterfly valve.
  • the self-sealing butterfly valve of the second structure comprises a valve body 1, a fluid passage 2 is disposed in the valve body, a valve plate 4 is disposed in the fluid passage 2, and an upper portion of the valve plate 4 and a driving device rotatably connected to the valve body 1 are provided.
  • the shaft 5 is dynamically connected, and the lower portion of the valve plate 4 is rotatably connected with the support shaft 6 connected to the valve body.
  • the rotation of the drive shaft 5 can drive the valve plate 4 to rotate to realize the opening and closing of the valve.
  • the drive shaft 5 and the support shaft 6 and the valve body 1 are uniformly assembled by a sealing means, which is known in the art.
  • the drive shaft 5 and the support shaft 6 can be fitted with a seal ring to realize the valve body 1 Sealed fit.
  • the valve plate 4 is provided with an elastic sealing ring 11 capable of sandwiching the outer peripheral surface of the valve plate 4 and the outer edges of the both end faces of the valve plate 4, and the end faces of the valve plate 4 are respectively connected by bolts.
  • the retaining ring 12 and the inner end faces of the two retaining rings 12 are respectively pressed against the both end faces of the elastic sealing ring 12.
  • the outer edges of the end faces of the elastic sealing ring 11 are all axially convex, thereby forming two ring lips 7 which can be engaged with the inner wall of the fluid channel 2; the ring lip 7 is gradually thickened from the outside to the inside, thereby making the ring lip
  • the inner annular surface 8 of 7 is an inclined surface.
  • the elastic sealing ring 11 includes a collar 11-1 for covering the outer peripheral surface of the valve plate 4, and opposite sides of the collar 11-1 are respectively provided for a drive shaft mounting hole 11-4 for driving the drive shaft 5 and a support shaft mounting hole 11-5 for supporting the shaft insertion.
  • the inner wall surface of the ring sleeve 11-1 is provided with two blocking pieces 11-2, two The sheet stopper 11-2 and the ring sleeve 11-1 enclose a ring groove 11-3, and the elastic sealing ring 11 is fitted on the outer edge of the valve plate 4 through the mounting ring groove 11-3, and the two flaps 11-2
  • the outer side surface constitutes the two end faces of the elastic sealing ring 11, and the outer edge portion of the outer side surface of the blocking piece 11-2 is axially convexly formed to form the ring lip 7, and the two ends of the elastic sealing ring 11 are two
  • a rib 14 is provided on each of the outer faces of the sheet stopper 11-2.
  • the retaining ring 12 is an annular disc, and the inner end surface of the disc is provided with a positioning ring groove 13, and the outer peripheral surface of the disc is an inclined surface, and the disc is surrounded by a ring.
  • the retaining ring 12 can be provided with a component body structure, that is, the retaining ring is composed of a plurality of unit pieces, and each unit piece body is provided with at least two bolt wearing holes 15 and one threaded hole. 17.
  • the two retaining rings 12 pass The bolts 16 passing through the bolt insertion holes 15 are respectively screwed on both end faces of the valve plate 4, and the rib 14 is inserted into the ring groove 13, and the rib 14 and the ring groove 13 are matched to be better.
  • the elastic sealing ring 11 is fixed to the valve plate 4.
  • the inner end surface of the first retaining ring 12 is pressed against the one end surface of the elastic sealing ring 11, the outer peripheral surface thereof abuts against the inner annular surface 8 of the ring lip 7, and the inner end surface of the other retaining ring 12 is pressed against the elastic sealing ring.
  • the self-sealing effect is not good, and the thickness of the retaining ring 12 is smaller than the thickness.
  • the upper portion of the valve plate 4 is provided with an upper enlarged portion 9 for connection with the drive shaft 5, and the lower portion of the valve plate 4 is provided with a lower enlarged portion 10 for connection with the support shaft 6, which is inflated.
  • the lower surface of the portion 9 is disposed opposite to the upper surface of the lower enlarged portion 10 and the area of the lower surface of the upper enlarged portion 9 is larger than the area of the upper surface of the enlarged portion 10.
  • There is a pressure difference between the pressure generated by the fluid on the upper expanded portion 9 and the lower expanded portion 10, and the pressure difference can effectively offset the self-weight of the valve plate, so that the valve plate can be lifted in the direction of the drive shaft, so that the valve is turned on and off.
  • the small moment is not only flexible, but also reduces the wear of the elastic seal.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lift Valve (AREA)
  • Sealing Devices (AREA)

Abstract

一种自密封中线蝶阀，包括阀体（1），阀体（1）内设有流体通道（2），流体通道（2）内设有外表面包覆有弹性密封层（3）的阀板（4），阀板（4）上部与转动连接在阀体（1）上的驱动轴（5）动力相连，阀板（4）下部与连接在阀体（1）上的支撑轴（6）转动连接，阀板（4）两端面外缘的弹性密封层（3）均轴向外凸，从而形成能与流体通道内壁贴合的两道环唇（7）；环唇（7）自外向内逐渐变厚，从而使环唇（7）的内环面为倾斜面。该结构的中线蝶阀密封效果好，启闭灵活，使用寿命长。

Description

自密封蝶阀 技术领域
本发明涉及一种自密封蝶阀。 背景技术
现有的中线蝶阀包括阀体， 阀体内设有流体通道， 流体通道内设有外表 面包覆有弹性密封层的阀板， 阀板上部与转动连接在阀体上的驱动轴动力相 连， 阀板下部与连接在阀体上的支撑轴转动连接。 通过驱动轴驱动阀板以驱 动轴和支撑轴的轴线为中心进行转动来完成开启和关闭，通过阀板和流体通 道内壁对包覆在阀板外周面上的弹性密封层的挤压使之发生弹性变形来实 现关闭时的密封。 上述结构的中线蝶阀， 主要存在以下缺点： 一是对阀体和 阀轴的刚性要求比较高， 若阀体的刚性不足， 则会在流体压力的作用下发生 变形， 导致阀体与阀板接触不严而造成泄漏， 若阀轴刚性不足， 在流体压力 的作用下， 阀板则会沿流体通道的轴向产生位移， 而造成阀门泄漏； 为了提 高阀体和阀轴刚性， 势必要加大阀体和阀轴的材料用量， 从而造成阀体和阀 轴的重量大， 导致制作成本高。 二是由于弹性密封层受压较大， 不但导致阀 门启闭扭矩大， 而且使得弹性密封层的磨损加重， 使得阀门的使用寿命短， 更不适合启闭频繁的管道系统， 另外由于阀板的自重， 也加剧了磨损和启闭 的困难程度。 发明内容
本发明要解决的技术问题之一是针对上述缺陷一， 提供一种对阀体和阀 轴刚性要求不高、 可有效减小阀体和阀轴重量、 降低制作成本且密封效果好 的自密封蝶阀。
本发明要解决的技术问题之二是针对上述缺陷二， 提供一种启闭扭矩 小、 能进一步减小弹性密封层的磨损、 阀门使用寿命长且适合启闭频繁的管 道系统使用的自密封蝶阀。
为了解决上述技术问题之一， 本发明提供的第一种技术方案是： 自密封 蝶阀包括阀体， 阀体内设有流体通道， 流体通道内设有外表面包覆有弹性密 封层的阀板， 阀板上部与转动连接在阀体上的驱动轴动力相连， 阀板下部与 连接在阀体上的支撑轴转动连接，其结构特点在于所述阀板两端面外缘的弹 性密封层均轴向外凸， 从而形成能与流体通道内壁贴合的两道环唇； 所述环 唇自外向内逐渐变厚， 从而使所述环唇的内环面为倾斜面。
为了解决上述技术问题之二， 在第一种技术方案的基础上， 做了如下改 进： 所述阀板上部设有用于与驱动轴连接的上膨大部， 阀板下部设有用于与 支撑轴连接的下膨大部， 上膨大部的下表面与下膨大部的上表面相对设置且 上膨大部下表面的面积大于下膨大部上表面的面积。
为了解决上述技术问题之一， 本发明提供的第二种技术方案是： 自密封 蝶阀包括阀体， 阀体内设有流体通道， 流体通道内设有阀板， 阀板上部与转 动连接在阀体上的驱动轴动力相连， 阀板下部与连接在阀体上的支撑轴转动 连接， 其特征在于所述阀板上套装有能将阀板的外周面和阀板的两端面的外 缘包夹在其内的弹性密封圈， 弹性密封圈两端面的外缘均轴向外凸， 从而形 成能与流体通道内壁贴合的两道环唇； 所述环唇自外向内逐渐变厚， 从而使 所述环唇的内环面为倾斜面。
为了解决上述技术问题之二， 在第二种技术方案的基础上， 做了如下改 进： 所述阀板上部设有用于与驱动轴连接的上膨大部， 阀板下部设有用于与 支撑轴连接的下膨大部， 上膨大部的下表面与下膨大部的上表面相对设置且 上膨大部下表面的面积大于下膨大部上表面的面积。
为了弹性密封圈与阀板的可靠连接， 所述弹性密封圈包括用于包覆阀板 的外周面的环套， 环套的相对两侧分别设有驱动轴安装孔和支撑轴安装孔， 环套的内壁面上间隔设有两片挡片， 两片挡片和环套围成用于与阀板套装的 安装环槽， 两片挡片的外侧面构成所述弹性密封圈的两端面， 所述环唇设在 所述挡片的外缘上， 所述弹性密封圈的两端面上各环设有凸筋。
为了使弹性密封圈与阀板连接的更加可靠， 防止阀板转动时造成弹性密 封圈局部脱落或全部脱落， 所述阀板的两端面上各连接有一个挡圈， 两个挡 圈的内端面分别贴压在弹性密封圈的两端面上， 两个挡圈的外周面均为可顶 靠在所述内环面上的倾斜面， 所述挡圈的内端面上设有定位环槽， 所述凸筋 可插入所述定位环槽内。
为了挡圈与阀板的连接简便和方便调整挡圈对弹性密封圈的挤压程度， 所述挡圈上环布有多个螺栓穿装孔和多个螺纹孔， 所述挡圈通过穿入所述螺 栓穿装孔内螺栓连接在阀板上， 所述螺纹孔内螺接有顶靠在阀板上的螺钉。 为了便于挡圈的加工成型和简化工艺， 所述挡圈为由多片单元片体构成 的分体结构， 每一单元片体上至少设有两个螺栓穿装孔和一个螺纹孔。
为了不影响环唇的自密封效果， 防止挡圈影响环唇在流体压力下与流体 通道内壁的贴合效果， 所述挡圈的厚度小于所述环唇的轴向长度。
为了材料的易得， 所述弹性密封层为橡胶层或聚四氟乙烯层， 所述弹性 密封圈为橡胶密封圈或聚四氟乙烯密封圈。
上述结构的自密封蝶阀， 外表面包覆有弹性密封层的阀板或外边缘套 装有弹性密封圈的阀板与流体通道釆用微量过盈配合，可以满足流体的低压 密封， 随着流体通道内流体压力的逐步增高， 流体挤压环唇， 由于环唇的内 环面为倾斜面， 环唇受流体挤压后产生径向分力， 从而使环唇与流体通道内 壁紧密贴合， 形成自密封， 因而本发明的密封效果好。 不但如此， 由于环唇 在流体压力的作用下可以实现自密封， 即使阀体和阀轴的轻微变形， 环唇在 流体压力的作用下也会与流体通道内壁紧密贴合， 因此， 在满足阀体和阀轴 强度的前提下，可适当降低刚度要求，即适当减小阀体的壁厚和阀轴的直径， 以达到节约材料、 降低生产成本之目的。
改进后的自密封蝶阀， 由于上膨大部的下表面与下膨大部的上表面相对 设置且上膨大部下表面的面积大于下膨大部上表面的面积， 流体作用于上膨 大部下表面上的压力要比流体作用于下膨大部上表面上压力大， 即存在压力 差，该压力差可有效抵减阀板的自重，使阀板获得向驱动轴方向浮起的效果， 因此， 不但可以减小由于阀板自重带来的弹性密封层的磨损， 从而延长了阀 门的使用寿命， 而且开可以减小启闭扭矩， 使得阀门的开启灵活。
综上所述， 本发明具有以下优点： 1、 可实现自密封、 密封效果好； 2、 对阀体和阀轴的刚度要求不高， 可减小阀体的壁厚和阀轴的直径， 节约了材 料和降低了生产成本； 3、 启闭转矩小， 启闭灵活， 磨损小， 阀门使用寿命 长； 4、 可用于启闭频繁的管道系统。 附图说明
下面结合附图对本发明的具体实施方式作进一步的详细说明：
图 1是第一种自密封蝶阀的结构示意图；
图 2是阀板的结构示意图；
图 3是沿图 2中 A-A线的剖视图； 图 4是沿图 2中 B-B线的剖视图；
图 5是沿图 2中 C-C线的剖视图；
图 6是第二种自密封蝶阀的结构示意图；
图 7是图 6的 D向视图；
图 8是图 6中所示阀板的结构示意图；
图 9是沿图 8中 E-E线的剖视图；
图 10是图 8中 F-F线的剖视图
图 11是图 6中所示的弹性密封圈的结构示意图；
图 12是沿图 11中 G-G线的剖视图；
图 13是沿图 11中 H-H线的剖视图；
图 14是图 6中所示的挡圈的结构示意图；
图 15是沿图 14中 I-I线的剖视图；
图 16是沿图 14中 J-J线的剖视图。 具体实施方式
参照图 1， 本发明所提供的第一种结构形式的自密封蝶阀包括阀体 1， 阀体内设有流体通道 2， 流体通道 2内设有外表面包覆有弹性密封层 3的阀 板 4， 所述弹性密封层 3为橡胶层或聚四氟乙烯层。 阀板 4上部与转动连接 在阀体 1上的驱动轴 5动力相连， 阀板 4下部与连接在阀体上的支撑轴 6转 动连接， 驱动轴 5的转动可驱使阀板 4转动以实现阀门的启闭。 驱动轴 5和 支撑轴 6与阀体 1均釆用密封措施进行装配， 该密封措施为公知技术， 例如 可以釆用在驱动轴 5和支撑轴 6套装密封圈的方式以实现其与阀体 1的密封 配合。
参照图 1-5， 所述阀板 4两端面外缘的弹性密封层 3均轴向外凸， 从而 形成能与流体通道 2内壁贴合的两道环唇 7;所述环唇 7自外向内逐渐变厚， 从而使所述环唇 7的内环面 8为倾斜面。 所述阀板 4上部设有用于与驱动轴 5连接的上膨大部 9， 阀板 4下部设有用于与支撑轴 6连接的下膨大部 10， 上膨大部 9的下表面与下膨大部 10的上表面相对设置且上膨大部 9下表面 的面积大于下膨大部 10上表面的面积。
上述自密封蝶阀， 其阀板的外表面被弹性密封层完全包覆， 这种结构形 式适合尺寸小的中线蝶阀， 因为其阀板尺寸小容易实现被弹性密封层完全包 覆； 然而， 对于大尺寸的中线蝶阀， 其阀板的尺寸较大， 则很难实现用弹性 密封层完全包覆阀板， 也就是说， 上述第一种结构形式的自密封蝶阀， 很难 做成大尺寸的中线蝶阀。
基于上述第一种结构形式的自密封蝶阀的密封原理，我们提供了第二种 结构形式的自密封蝶阀， 以适应于大尺寸自密封蝶阀的生产制造。参照图 6， 第二种结构形式的自密封蝶阀包括阀体 1， 阀体内设有流体通道 2， 流体通 道 2内设有阀板 4，阀板 4上部与转动连接在阀体 1上的驱动轴 5动力相连， 阀板 4下部与连接在阀体上的支撑轴 6转动连接，驱动轴 5的转动可驱使阀 板 4转动以实现阀门的启闭。驱动轴 5和支撑轴 6与阀体 1均釆用密封措施 进行装配， 该密封措施为公知技术， 例如可以釆用在驱动轴 5和支撑轴 6套 装密封圈的方式以实现其与阀体 1的密封配合。 所述阀板 4上套装有能将阀 板 4的外周面和阀板 4的两端面的外缘包夹在其内的弹性密封圈 11， 阀板 4 的两端面上各通过螺栓连接有一个挡圈 12， 两个挡圈 12的内端面分别贴压 在弹性密封圈 12的两端面上。 弹性密封圈 11两端面的外缘均轴向外凸， 从 而形成能与流体通道 2内壁贴合的两道环唇 7; 所述环唇 7自外向内逐渐变 厚， 从而使所述环唇 7的内环面 8为倾斜面。
参照图 6、 图 11、 图 12和图 13， 所述弹性密封圈 11包括用于包覆阀板 4的外周面的环套 11-1，环套 11-1的相对两侧分别设有用于驱动轴 5穿装的 驱动轴安装孔 11-4和用于支撑轴穿装的支撑轴安装孔 11-5， 环套 11-1的内 壁面上间隔设有两片挡片 11-2， 两片挡片 11-2 和环套 11-1 围成安装环槽 11-3 , 弹性密封圈 11通过安装环槽 11-3套装在阀板 4的外缘上， 两片挡片 11-2的外侧面构成所述弹性密封圈 11的两端面， 所述挡片 11-2外侧面的外 缘部位均轴向外凸形成所述环唇 7，所述弹性密封圈 11的两端面上即两片挡 片 11-2的外侧面上各环设有凸筋 14。
参照图 6、 图 14、 图 15和图 16， 所述挡圈 12为一环状圓盘， 圓盘内端 面上设有定位环槽 13， 圓盘外周面为倾斜面， 圓盘上环布有多个螺栓穿装孔 15和多个螺纹孔 17， 所述螺栓穿装孔 15和螺纹孔 17交错设置即相邻两个 螺栓穿装孔 15之间设有一个螺纹孔 17。 为了成型容易和简洁制作工序， 所 述挡圈 12可以设置成分体结构， 即挡圈由多片单元片体构成， 每一单元片 体上至少设有两个螺栓穿装孔 15和一个螺纹孔 17。
参照图 6和图 7， 弹性密封圈 11套装在阀板 4上后， 两个挡圈 12通过 穿过所述螺栓穿装孔 15的螺栓 16分别螺接在阀板 4的两端面上， 所述凸筋 14插入所述环槽 13内， 凸筋 14和环槽 13相配合可以更好的将弹性密封圈 11固定在阀板 4上。 一挡圈 12的内端面贴压在弹性密封圈 11的一端面上， 其外周面贴靠在一环唇 7的内环面 8上， 另一挡圈 12的内端面贴压在弹性 密封圈 11的另一端面上， 其外周面贴靠在另一环唇 7的内环面 8上。 所述 螺纹孔 17内螺接有顶靠在阀板 4上的螺钉 18。 通过调节螺栓 16和螺钉 18 的松紧， 可以改变挡圈 12对弹性密封圈 11的挤压程度使之发生合适的径向 变形， 以获得弹性密封圈 11与流体通道 2装配时所需的合适过盈量。 为了 防止挡圈 12干涉所述环唇 7在流体压力下的弹性变形， 影响环唇 7与流体 通道 2内壁的贴合而造成自密封效果不佳， 所述挡圈 12的厚度要小于所述 环唇 7的轴向长度。
参照图 8、 图 9和图 10， 所述阀板 4上部设有用于与驱动轴 5连接的上 膨大部 9， 阀板 4下部设有用于与支撑轴 6连接的下膨大部 10， 上膨大部 9 的下表面与下膨大部 10的上表面相对设置且上膨大部 9下表面的面积大于 下膨大部 10上表面的面积。 流体在上膨大部 9和下下膨大部 10上产生的压 力存在压力差， 该压力差可有效抵减阀板的自重， 使阀板获得向驱动轴方向 浮起的效果， 使得阀门启闭转矩小， 不但开启灵活， 而且可以减小弹性密封 圈的磨损。

Claims

权利要求
1. 一种自密封蝶阀， 包括阀体（1)， 阀体内设有流体通道（2)， 流体通 道（2) 内设有外表面包覆有弹性密封层 （3) 的阀板（4)， 阀板（4)上部 与转动连接在阀体（1 )上的驱动轴 （5)动力相连， 阀板（4) 下部与连接 在阀体上的支撑轴（6)转动连接， 其特征在于所述阀板（4) 两端面外缘的 弹性密封层（3)均轴向外凸， 从而形成能与流体通道（2) 内壁贴合的两道 环唇（7); 所述环唇（7) 自外向内逐渐变厚， 从而使所述环唇（7) 的内环 面 （8) 为倾斜面。
2. 如权利要求 1所述的自密封蝶阀， 其特征在于所述阀板（4)上部设 有用于与驱动轴（5)连接的上膨大部（9)， 阀板（4)下部设有用于与支撑 轴 （6)连接的下膨大部 （10)， 上膨大部 （9) 的下表面与下膨大部 （10) 的上表面相对设置且上膨大部 （9) 下表面的面积大于下膨大部 （10)上表 面的面积。
3. 如权利要求 1或 2所述的自密封蝶阀，其特征在于所述弹性密封层（ 3 ) 为橡胶层或聚四氟乙烯层。
4. 一种自密封蝶阀， 包括阀体（1)， 阀体内设有流体通道（2)， 流体通 道（2) 内设有阀板（4)， 阀板（4)上部与转动连接在阀体（1)上的驱动 轴（5)动力相连， 阀板（4)下部与连接在阀体上的支撑轴（6)转动连接， 其特征在于所述阀板（4)上套装有能将阀板（4) 的外周面和阀板（4) 的 两端面的外缘包夹在其内的弹性密封圈 （11)， 弹性密封圈 （11 ) 两端面的 外缘均轴向外凸， 从而形成能与流体通道（2) 内壁贴合的两道环唇（7); 所述环唇（7) 自外向内逐渐变厚， 从而使所述环唇（7) 的内环面 （8) 为 倾斜面。
5. 如权利要求 4所述的自密封蝶阀， 其特征在于所述阀板（ 4 )上部设 有用于与驱动轴（5)连接的上膨大部（9)， 阀板（4)下部设有用于与支撑 轴 （6)连接的下膨大部 （10)， 上膨大部 （9) 的下表面与下膨大部 （10) 的上表面相对设置且上膨大部 （9) 下表面的面积大于下膨大部 （10)上表 面的面积。
6. 如权利要求 4所述的自密封蝶阀， 其特征在于所述弹性密封圈 （11) 包括用于包覆阀板（4) 的外周面的环套（11-1)， 环套（11-1 ) 的相对两侧 分别设有驱动轴安装孔（ 11-4 )和支撑轴安装孔（ 11-5 )， 环套（ 11-1 ) 的内 壁面上间隔设有两片挡片 （11-2)， 两片挡片 （ 11-2)和环套（ 11-1 ) 围成用 于与阀板（4)套装的安装环槽 （11-3)， 两片挡片 （11-2) 的外侧面构成所 述弹性密封圈 （11)的两端面， 所述环唇（7)设在所述挡片 （11-2)的外缘 上， 所述弹性密封圈 （11) 的两端面上各环设有凸筋 （14)。
7. 如权利要求 4、 5或 6所述的自密封蝶阀， 其特征在于所述阀板（4) 的两端面上各连接有一个挡圈 （12)， 两个挡圈 （12) 的内端面分别贴压在 弹性密封圈 （12)的两端面上， 两个挡圈 （12)的外周面均为可顶靠在所述 内环面 （8)上的倾斜面， 所述挡圈 （12) 的内端面上设有定位环槽（13)， 所述凸筋 （14)可插入所述定位环槽（13) 内。
8. 如权利要求 7所述的自密封蝶阀， 其特征在于所述挡圈（ 12 )上环布 有多个螺栓穿装孔（15)和多个螺纹孔（17)， 所述挡圈 （12)通过穿入所 述螺栓穿装孔（ 15 ) 内螺栓（ 16 )连接在阀板（ 4 )上， 所述螺纹孔（ 17 ) 内螺接有顶靠在阀板（4)上的螺钉（18)。
9. 如权利要求 8所述的自密封蝶阀， 其特征在于所述挡圈（ 12 )为由多 片单元片体构成的分体结构，每一单元片体上至少设有两个螺栓穿装孔（ 15) 和一个螺纹孔（ 17 )。
10. 如权利要求 7所述的自密封蝶阀， 其特征在于所述挡圈 （12) 的厚 度小于所述环唇（7) 的轴向长度。
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