WO2019080894A1 - 金属管道卡环式连接结构 - Google Patents

金属管道卡环式连接结构

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Publication number
WO2019080894A1
WO2019080894A1 PCT/CN2018/111851 CN2018111851W WO2019080894A1 WO 2019080894 A1 WO2019080894 A1 WO 2019080894A1 CN 2018111851 W CN2018111851 W CN 2018111851W WO 2019080894 A1 WO2019080894 A1 WO 2019080894A1
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WO
WIPO (PCT)
Prior art keywords
ring
snap ring
groove
metal
sealing
Prior art date
Application number
PCT/CN2018/111851
Other languages
English (en)
French (fr)
Inventor
周庆念
余张法
Original Assignee
周庆念
余张法
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 周庆念, 余张法 filed Critical 周庆念
Publication of WO2019080894A1 publication Critical patent/WO2019080894A1/zh

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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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • F16L21/03—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings placed in the socket before connection
    • 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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • F16L21/08—Joints with sleeve or socket with additional locking means

Definitions

  • the invention relates to a metal pipe connection structure, in particular to a metal pipe snap ring connection structure.
  • Fluid delivery pipes are often used in the construction and industrial sectors.
  • Conventional fluid delivery pipes are connected by pipe fittings, which are usually threaded to form various piping systems.
  • pipe fittings which are usually threaded to form various piping systems.
  • the installation efficiency of the threaded connection is not high, and there are certain requirements for the working space, and a series of problems such as preventing leakage at the joint are also solved.
  • connection structure of the snap-in metal pipe fittings has been gradually developed.
  • the thin-walled metal tube design uses a special tool to crimp and deform the thin wall, so that the pipe connection is completed instantaneously.
  • the crimping tool simultaneously presses the two portions of the socket section M and the sealing groove N, and the sealing groove portion is compressed, forcing the O-ring seal in the groove to closely adhere to the steel pipe.
  • the function of sealing and stopping water is that the socket section M is pressed by the hexagon, and the steel pipe and the pipe fitting are pressed and deformed, and the rigidity of the metal material itself is utilized to resist the drawing.
  • the structure is simple in construction, short in operation time, no threaded connection of the joint, no complicated threading operation, no high temperature open flame, no pre-treatment during welding, no oil pollution or welding slag pollution during construction cutting or joining.
  • the key can be made of various metal materials, such as stainless steel, copper, carbon steel pipe, and the like.
  • stainless steel or copper fittings can be used, but this also leads to an increase in material costs. Therefore, in the current card-type connecting pipeline, more carbon steel galvanized thin-walled tubes are still used, and the connection method is still stuck-type, so that the cost performance is higher than that of the stainless steel tube and the copper tube.
  • Fig. 1B shows an enlarged view of a portion B of the snap-in metal pipe connecting structure of Fig. 1A.
  • the socket portion M of the snap-in tubular member 91 is subjected to hexagonal pressing, the galvanized carbon steel pipe 92 and the pipe member are frictionally deformed, resulting in the outer wall of the galvanized carbon steel pipe 92 and the inner wall of the pressed tubular member 91.
  • the galvanized layer is destroyed, and the water flow F in the pipe flows from the gap of the cannula to the hex extrusion deformation portion, and the galvanized layer of the inner wall of the galvanized carbon steel pipe 92 and the pressed pipe member 91 has been destroyed.
  • Carbon steel pipes and snap-in pipe fittings are eroded and oxidized under the action of water flow, thereby making the service life of the pipe greatly reduced.
  • the insertion end easily causes damage or displacement of the rubber sealing ring, resulting in a tight seal.
  • the present invention provides a metal pipe snap ring type connecting structure, comprising: a snap ring type pipe member having at least a sealing groove and a snap ring groove on an inner circumferential surface of the socket end, wherein the snap ring groove is located in the sealing groove An axially outer side; a sealing ring disposed in the sealing groove; a guiding ring disposed in the snap ring groove and located axially outside the sealing ring, the inner diameter of the guiding ring being smaller than the inner diameter of the sealing ring and larger than the metal tube An outer diameter; and a metal snap ring having a notched annular shape disposed in the snap ring groove and located axially outward of the guide ring, wherein the pressure is utilized when the metal tube is inserted into the socket of the snap ring tube
  • the connecting tool presses the sealing groove of the snap ring type pipe fitting and the snap ring groove to deform, so that the metal pipe is deformed correspondingly by the tightening deformation of the snap ring, thereby achieving the
  • a guide ring disposed in the snap ring groove and located between the seal ring and the snap ring may be further included, the inner diameter of the guide ring being smaller than the inner diameter of the seal ring and larger than the metal The outer diameter of the tube.
  • the guide ring is made of polyethylene.
  • the anti-seepage ring disposed on the axially outer side of the snap ring is further included, so that the snap ring type pipe and the metal pipe are realized from the axially outer side when the snap ring type pipe member is pressed.
  • the anti-seepage ring is made of engineering plastic.
  • the metal pipe is a galvanized pipe.
  • the inner side of the metal snap ring has a toothed structure.
  • the inner circumferential surface of the metal snap ring has a tapered surface.
  • the width of the cross section of the seal ring is greater than the height. Further preferably, the elliptical cross section of the cross section of the sealing ring.
  • the invention also provides a metal pipe snap ring type connecting structure, comprising: a snap ring type pipe member, the bearing end is provided with a sealing groove and a snap ring groove; a sealing ring is disposed in the sealing groove; the snap ring, It has a ring-shaped annular shape so as to be disposed in the snap ring groove and facilitates compression deformation; and a guide ring disposed in the snap ring groove, the inner diameter of the guide ring being smaller than the inner diameter of the seal ring and larger than the outer diameter of the metal pipe
  • the invention also provides a metal pipe snap ring connection structure, comprising: a snap ring type pipe member, the bearing end is provided with a sealing groove and a snap ring groove; a sealing ring is disposed in the sealing groove; the metal snap ring , which has an annular shape with a notch so as to be disposed in the snap ring groove and facilitate compression deformation; and an anti-seepage ring which is disposed at the outermost axial direction in the socket of the snap ring type pipe, the diameter of the anti-seepage ring is smaller than The diameter of the seal ring is slightly larger than the diameter of the metal tube, so that the seal between the snap ring tube and the metal tube is realized from the axially outer side when the snap ring tube is pressed.
  • the present invention can be blocked by the sealing ring before the fluid penetrating between the snap ring type pipe member and the inserted metal pipe reaches the damaged portion of the galvanized layer, thereby preventing corrosion of the metal pipe, thereby improving the entire The life of the connection structure.
  • the present invention can prevent damage to the seal ring during the insertion of the metal pipe member into the joint structure.
  • 1A is a schematic view showing a connection structure of a snap-in metal pipe fitting in the prior art.
  • Fig. 1B shows an enlarged view of a portion B of the snap-in metal pipe connecting structure of Fig. 1A.
  • FIG. 2 is a half cross-sectional view showing the structure of a snap ring type pipe fitting of the metal pipe snap ring type connection structure of the present invention.
  • FIG. 3 is a half cross-sectional view showing the metal pipe snap ring connection structure of the present invention, in which the inside of the snap ring pipe member has been mounted with a seal ring, a guide ring, a snap ring, and an anti-seepage ring, but has not been assembled with the metal pipe.
  • FIG. 4 is a cross-sectional view showing the metal pipe snap ring connection structure of the present invention, in which the inside of the snap ring pipe member has been installed with a seal ring, a guide ring, a snap ring, an anti-seepage ring, and a metal pipe is inserted and carried out. Crimp assembly.
  • Fig. 5 is an enlarged view showing a portion A of the metal pipe clasp type connection structure of Fig. 4.
  • Fig. 6 shows a toroidal snap ring of the present invention, wherein the right side view is a cross-sectional view of the left side view.
  • Figure 7 shows a ring gear type snap ring of the present invention.
  • the snap ring type pipe fitting 1 of the metal pipe snap ring type connecting structure of the present invention has a socket at one end for inserting a desired metal pipe.
  • the socket of the snap ring type pipe fitting 1 is provided with a seal groove 2 and a snap ring groove 3 in this order from the inside to the outside.
  • the inner diameter of the seal groove 2 and the snap ring groove 3 is larger than the inner diameter of the other portions of the snap ring type pipe member 1 to accommodate the rubber seal ring and the snap ring.
  • the snap ring type pipe fitting 1 shown in the drawing is integrally formed.
  • FIG. 3 is a half cross-sectional view showing the metal pipe snap ring connection structure of the present invention.
  • the seal ring 4, the guide ring 5, the snap ring 6 and the anti-seepage ring 8 have been mounted in the seal groove 2 and the snap ring groove 3 of the snap ring type pipe member 1, but have not been assembled with the metal pipe.
  • the guide ring 5 is not necessary.
  • the guide ring 5 has a circular shape whose inner diameter is smaller than the inner diameter of the seal ring 4 and larger than the outer diameter of the metal pipe 7 to be inserted.
  • Fig. 4 is a cross-sectional view showing the metal pipe clasp type connection structure of the present invention.
  • Fig. 5 is an enlarged view showing a portion A of the snap ring type metal pipe connecting structure of Fig. 4.
  • the sealing ring 4, the guiding ring 5, the snap ring 6 and the anti-seepage ring 8 are sequentially installed in the sealing groove 2 and the snap ring groove 3 of the snap ring type pipe fitting 1, and the metal is inserted.
  • Tube 7 was crimped and assembled.
  • the guide ring 5 has a metal tube 7 which helps to guide the insertion, avoiding damage or moving the sealing ring 4, thereby better ensuring the sealing effect.
  • the inner diameter of the guide ring 5 is smaller than the inner diameter of the sealing ring 4 and larger than the outer diameter of the metal tube 7, thereby achieving a guiding effect on the insertion of the metal tube 7.
  • the guide ring 5 can be made of any suitable material as long as it meets the requirements of strength toughness and corrosion resistance, and produces sufficient deformation under pressure without being damaged. It is preferred to use an engineering plastic such as polyethylene or the like.
  • the anti-seepage ring 8 is not required.
  • the anti-seepage ring 8 has a circular shape and is disposed at the axially outermost side in the socket of the snap ring type pipe member 1. When the snap ring type pipe member 1 is pressed, the anti-seepage ring 8 and the metal pipe 7 are brought into close contact, and the seal is realized from the axially outer side, so that external moisture can be prevented from infiltrating into the snap ring type pipe member 1 to cause corrosion.
  • the diameter of the anti-seepage ring 8 can be set smaller than the diameter of the seal ring 4 and larger than the diameter of the metal pipe 7. At this time, the anti-seepage ring 8 can function as a guide ring (centering the inserted metal pipe 7 to avoid damage or moving the seal ring 4), whereby the guide ring 5 can be omitted.
  • the anti-seepage ring 8 can be made of any suitable material as long as it can satisfy the strength toughness and corrosion resistance requirements, and produces sufficient deformation under pressure without being damaged. It is preferred to use an engineering plastic such as polyethylene or the like.
  • the arrangement order of the seal ring 4, the guide ring 5, the snap ring 6 and the anti-seepage ring 8 shown in the drawing is only a preferred fact.
  • the basic function of the guide ring 5 is to guide the metal tube 7 to be inserted in the center to avoid damage or to move the sealing ring 4.
  • the basic function of the anti-seepage ring 8 is to prevent external moisture from infiltrating into the snap ring tube 1 and causing corrosion.
  • Other arrangements are also possible on request.
  • the guide ring 5 is placed in the axial direction of the seal ring 4 in the socket of the snap ring type pipe member 1.
  • the seepage prevention ring 8 is disposed in the axially outermost side in the socket of the snap ring type tubular member 1.
  • the sealing ring 4 preferably adopts a relatively flat structure, that is, a cross section having a width larger than the height to increase the contact area with the sealed tubular member, thereby improving the sealing effect.
  • a relatively flat structure that is, a cross section having a width larger than the height to increase the contact area with the sealed tubular member, thereby improving the sealing effect.
  • the snap ring 6 has an annular shape with a notch to reduce the inner diameter when subjected to radial compression.
  • the snap ring 6 can take various forms. As an example, Figure 6 shows a toroidal snap ring.
  • the right side view of Fig. 6 is a cross-sectional view of the left side view.
  • the right side view of Fig. 6 shows that the inner circumferential surface of the snap ring 6 has a tapered surface.
  • this is only an exemplary cross section, which may also take the form of a rectangular cross section as shown in FIG.
  • Fig. 7 shows a ring-shaped snap ring having a tooth-like structure distributed in the circumferential direction inside. This toothed structure helps to be inserted into the metal tube when subjected to radial compression to increase the tensile strength. Similarly, the inner peripheral surface structure of the tapered surface of the snap ring 6 shown in Fig. 7 can also be applied to the annular snap ring shown in Fig. 6.
  • the metal pipe snap ring connection structure shown in Fig. 4 is assembled as such. First, the metal pipe 7 is inserted into the socket of the snap ring pipe 1 in which the seal ring 4, the guide ring 5, the snap ring 6 and the anti-seepage ring 8 have been mounted as shown in Fig. 3, and then the retaining tool is used to the snap ring. The seal groove 2 and the snap ring groove 3 on the tubular member 1 are simultaneously compressed to a predetermined size. At this time, the circumferential compression of the sealing groove 2 forces the inner sealing ring 4 to abut against the metal pipe 8 to form a one-side seal, which prevents fluid leakage in the pipe and satisfies the sealing requirements.
  • the snap ring groove 3 is circumferentially compressed, forcing the inner snap ring 6 to be tightly inserted into the metal tube 7 to form a compression groove embedded in the metal tube, which satisfies the pipe pull-out performance.
  • the guide ring 5 is also simultaneously compressed inwardly on the circumference so as to abut against the outer surface of the metal tube 7 and the inner surface of the snap ring tube 1 to form a further seal.
  • the anti-seepage ring 8 is provided, the anti-seepage ring 8 is also simultaneously compressed inwardly on the circumference so as to be in close contact with the outer surface of the metal pipe 7 and the inner surface of the snap-in tubular member 1 to form a further seal.
  • the test data shows that the pull-out force of the snap ring connection of the same specification is 2.2 times or more of the pull-out force of the snap-fit connection.
  • the modified pull-up force of the snap-on connection is the same specification. More than 4 times the pull resistance.
  • the metal pipe snap ring connection structure is only subjected to compression deformation of the seal groove 2 and the snap ring groove 3 (in the same region) on the snap ring type pipe member 1, and the other portions are not deformed.
  • FIG. 5 shows that although the snap ring 6 is tightly embedded in the metal tube 7 to cause the galvanized layer of the outer wall of the galvanized steel pipe to be broken, the water flow infiltrated between the snap ring type pipe member 1 and the inserted metal pipe 7 is reached. The damaged portion of the galvanized layer is blocked by the sealing ring 4, so that the metal tube 7 is not corroded.
  • Figure 5 also shows that although the snap ring 6 is tightly embedded in the metal tube 7 to cause the galvanized layer of the outer wall of the galvanized steel pipe to be broken, the anti-seepage ring 8 forms a seal on the axially outermost side in the socket of the snap ring type pipe member 1.
  • the structure of the present invention allows the connected galvanized steel pipe to not deteriorate in service life due to destruction of the galvanized layer.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

一种金属管道卡环式连接结构，其包括：卡环式管件(1)，其承口端内周面上至少设有密封槽(2)和卡环槽(3)，卡环槽(3)位于密封槽(2)的轴向外侧；密封圈(4)，其设置在密封槽(2)中；导向圈(5)，设置在卡环槽(3)中并位于密封圈(4)的轴向外侧，导向圈(5)的内径小于密封圈(4)的内径且大于金属管(7)的外径；以及金属卡环(6)，其呈具有缺口的环状，从而设置在卡环槽(3)中并位于导向圈(5)的轴向外侧，其中当金属管(7)***卡环式管件(1)的承口到位时，利用压接工具压紧卡环式管件(1)的密封槽(2)和卡环槽(3)使之变形，从而通过卡环的收紧变形使金属管相应变形，由此通过密封圈实现金属管卡环式管件之间的密封连接。

Description

金属管道卡环式连接结构 技术领域
本发明涉及金属管道连接结构，尤其涉及金属管道卡环式连接结构。
背景技术
在建筑领域以及工业领域，经常用到流体输送管道。传统的流体输送管道由管件连接而成，管件之间通常采用螺纹连接，以形成各种管道***。作为一种成熟的管道管件连接方式，螺纹连接的安装效率不高，且对作业空间有一定的要求，还要解决防止连接处泄漏等一系列问题。
为此，近年来逐渐发展起卡压式金属管件连接结构。其采用薄壁金属管设计，利用专用工具压接使薄壁变形，从而使管件连接瞬间完成。如图1A所示，卡压式连接剖视图中，压接工具针对承口段M和密封槽N两处同时进行压接，密封槽部位受到压缩，迫使槽内的O型密封圈紧贴钢管，起到密封止水的作用，承口段M受到六角卡压，钢管和管件挤压变形，利用金属材料本身的刚性，起到抗拉拔作用。
这种结构施工简单，操作时间短，接头无螺纹连接，无复杂的套丝作业，无高温明火，无焊接时的前后处理，无施工切削或衔接时的油污染或焊渣污染。
在卡压式金属管件连接结构中，其关键可以由各种金属材料制成，例如，不锈钢、铜、碳素钢管等。在对抗腐蚀性有一定要求的管道***(例如，在建筑物的消防喷淋管道***)中，可以采用较为不锈钢管件或铜制管件，但这也导致了材料成本的提高。因此，在目前的卡压式连接管道中，更多的还是沿用了碳钢材质镀锌薄壁管，连接方式仍然采用卡压式，以获得比采用不锈钢管与铜管上更高的性价比。
然而，在卡压式金属管件连接结构中采用镀锌碳钢管存在很大的缺陷。图1B示出了图1A的卡压式金属管件连接结构的部位B的放大图。如图1B所示，由于卡压式管件91的承口段M受到六角卡压，镀 锌碳钢管92和管件摩擦挤压变形，造成镀锌碳钢管92的外壁和卡压式管件91的内壁的镀锌层被破坏，而管道内的水流F由插管间隙中流入，直达六角挤压变形部位，此时镀锌碳钢管92和卡压式管件91的内壁的镀锌层已经被破坏，碳钢管和卡压式管件在水流的作用下被侵蚀氧化，由此使得管道的使用寿命将大打折扣。
此外，在将金属管***卡压式金属管件的过程中，***端容易导致橡胶密封圈的损坏或移位，造成密封不严。
公开于本发明背景部分的信息仅仅旨在增加对本发明的总体背景的理解，而不应当被视为承认或以任何形式暗示该信息构成已为本领域一般技术人员所公知的现有技术。
发明内容
本发明的目的是提供一种金属管道卡环式连接结构，其能够解决现有的镀锌碳钢管连接结构中抗腐蚀性降低的缺陷。
本发明的又一个目的是提供一种金属管道卡环式连接结构，其能够防止在金属管件***连接结构的过程中对于密封圈的损坏。
本发明提供一种金属管道卡环式连接结构，其包括：卡环式管件，其承口端内周面上至少设有密封槽和卡环槽，所述卡环槽位于所述密封槽的轴向外侧；密封圈，其设置在所述密封槽中；导向圈，其设置在卡环槽中并位于密封圈的轴向外侧，所述导向圈的内径小于密封圈的内径且大于金属管的外径；以及金属卡环，其呈具有缺口的环状，从而设置在卡环槽中并位于导向圈的轴向外侧，其中当金属管***卡环式管件的承口到位时，利用压接工具压紧卡环式管件的密封槽和卡环槽使之变形，从而通过卡环的收紧变形使金属管相应变形，由此通过密封圈实现金属管卡环式管件之间的密封连接。
在上述金属管道卡环式连接结构中，优选地，还可以包括设置在卡环槽中并位于密封圈和卡环之间的导向圈，所述导向圈的内径小于密封圈的内径且大于金属管的外径。进一步优选地，所述导向圈由聚乙烯制成。
在上述金属管道卡环式连接结构中，优选地，还包括设置在卡环轴向外侧的防渗环，从而在卡环式管件被压紧时从轴向外侧实现卡环 式管件与金属管之间的密封。进一步优选地，所述防渗环由工程塑料制成。
在上述金属管道卡环式连接结构中，优选地，所述金属管为镀锌管。
在上述金属管道卡环式连接结构中，优选地，所述金属卡环的内侧带有齿状结构。
在上述金属管道卡环式连接结构中，优选地，所述金属卡环的内周表面呈锥形面。
在上述金属管道卡环式连接结构中，优选地，所述密封圈的横截面的宽度大于高度。进一步优选地，所述密封圈的横截面的椭圆横截面。
本发明还提供一种金属管道卡环式连接结构，其包括：卡环式管件，其承口端设有密封槽和卡环槽；密封圈，其设置在所述密封槽中；卡环，其呈具有缺口的环状，从而设置在卡环槽中并便于压缩变形；以及导向圈，其设置在卡环槽中，所述导向圈的内径小于密封圈的内径且大于金属管的外径，其中当金属管***卡环式管件的承口到位时，利用压接工具压紧卡环式管件的密封槽和卡环槽使之变形，从而实现金属管卡环式管件之间的密封连接。
本发明还提供一种金属管道卡环式连接结构，其包括：卡环式管件，其承口端设有密封槽和卡环槽；密封圈，其设置在所述密封槽中；金属卡环，其呈具有缺口的环状，从而设置在卡环槽中并便于压缩变形；以及防渗环，其在卡环式管件的承口内设置在轴向最外侧，所述防渗环的直径小于密封圈的直径且略大于金属管的直径，从而在卡环式管件被压紧时从轴向外侧实现卡环式管件与金属管之间的密封。
通过上述结构，本发明能够在渗入到卡环式管件和***的金属管之间的流体到达镀锌层受损处之前就被密封圈所阻挡，因而不会对金属管造成腐蚀，从而提高整个连接结构的寿命。
另外，通过导向圈的设置，本发明能够防止在金属管件***连接结构的过程中对于密封圈的损坏。
本发明的方法和装置具有其他的特性和优点，这些特性和优点从并入本文中的附图和随后的具体实施方式中将是显而易见的，或者将 在并入本文中的附图和随后的具体实施方式中进行详细陈述，这些附图和具体实施方式共同用于解释本发明的特定原理。
附图说明
图1A为现有技术中卡压式金属管件连接结构的示意图。
图1B示出了图1A的卡压式金属管件连接结构的部位B的放大图。
图2是本发明的金属管道卡环式连接结构的卡环式管件构造半剖示意图。
图3是本发明的金属管道卡环式连接结构的半剖示意图，其中卡环式管件的内部已经安装了密封圈、导向圈、卡环、防渗环，但还没有与金属管进行装配。
图4是本发明的金属管道卡环式连接结构的剖示图，其中卡环式管件的内部已经安装了密封圈、导向圈、卡环、防渗环，且***了金属管，并进行了压接装配。
图5示出了图4的金属管件卡环式连接结构的部位A的放大图。
图6示出了本发明的圆环式卡环，其中右侧图为左侧图的剖视图。
图7示出了本发明的齿环式卡环。
应当了解，附图并不必须是按比例绘制的，其示出了某种程度上经过简化了的本发明的基本原理的各个特征。在此所公开的本发明的特定的设计特征，包括例如特定的尺寸、定向、定位和外形，将部分地由特定目的的应用和使用环境所确定。
在本发明的附图中，在贯穿附图的多幅图形中，附图标记指代本发明的相同或等效的部分。
具体实施方式
现在将具体参考本发明的各个实施例，在附图中和以下的描述中示出了这些实施例的实例。虽然本发明与示例性实施例相结合进行描述，但是应当了解，本说明书并非旨在将本发明限制为那些示例性实施例。相反，本发明旨在不但覆盖这些示例性实施例，而且覆盖可以被包括在由所附权利要求所限定的本发明的精神和范围之内的各种替换、修改、等效形式以及其它实施例。
如图2所示，本发明的金属管道卡环式连接结构的卡环式管件1的一端具有承口，用以***所要金属管。卡环式管件1的承口由内向外依次设有密封槽2和卡环槽3。密封槽2和卡环槽3的内径大于卡环式管件1其他部分的内径，以便容纳橡胶密封圈和卡环。图中所示的卡环式管件1为一体成型。
图3是本发明的金属管道卡环式连接结构的半剖示意图。如图3所示，卡环式管件1的密封槽2和卡环槽3内已经安装了密封圈4、导向圈5、卡环6和防渗环8，但还没有与金属管进行装配。
在此，导向圈5不是必须的。导向圈5呈圆环形，其的内径小于密封圈4的内径且大于待***的金属管7的外径。
图4是本发明的金属管道卡环式连接结构的剖示图。图5示出了图4的卡环式金属管件连接结构的部位A的放大图。如图4、图5所示，卡环式管件1的的密封槽2和卡环槽3内已经依次安装了密封圈4、导向圈5、卡环6和防渗环8，且***了金属管7，并进行了压接装配。
在此，导向圈5存在有助于引导***的金属管7对中，避免损伤或移动密封圈4，从而更好地保证密封的效果。为此，导向圈5的内径小于密封圈4的内径而大于金属管7的外径，由此实现对于金属管7***的引导作用。
导向圈5可以由任何合适的材料制成，只要能够满足强度韧性和耐腐蚀要求，且在受压时产生足够的变形而不被破坏即可。优选采用工程塑料，例如聚乙烯等。
防渗环8不是必须的。防渗环8呈圆环形，设置在卡环式管件1的承口中的轴向最外侧。在卡环式管件1被压紧时，防渗环8与金属管7之间实现紧密接合，从轴向外侧实现密封，因而可以防止外部的水分渗入到卡环式管件1中而造成腐蚀。
可以将防渗环8直径设置为小于密封圈4的直径，且大于金属管7的直径。此时，防渗环8可以起到导向圈的作用(引导***的金属管7对中，避免损伤或移动密封圈4)，由此可以省略导向圈5。
防渗环8可以由任何合适的材料制成，只要能够满足强度韧性和耐腐蚀要求，且在受压时产生足够的变形而不被破坏即可。优选采用工程塑料，例如聚乙烯等。
而且需要说明的是，图中所示的密封圈4、导向圈5、卡环6和防渗环8的排列顺序仅是一种优选的事实方案。导向圈5的基本作用在于引导金属管7对中***避免损伤或移动密封圈4，防渗环8的基本作用在于防止外部的水分渗入到卡环式管件1中而造成腐蚀，在满足密封这些要求的前提下，其他的排列方式也是可能的。例如，不论其他相关部件的设置顺序如何，使导向圈5在卡环式管件1的承口内紧贴密封圈4的轴向外侧设置。又例如，不论其他相关部件的设置顺序如何，使防渗环8在卡环式管件1的承口内设置在轴向最外侧。
密封圈4优选采用较扁平的结构，即，宽度大于高度的横截面，以增大与所密封管件之间的接触面积，从而提高密封效果。例如，矩形横截面或椭圆形横截面截面，或其他适合形状的横截面。
卡环6呈具有缺口的环状，以便在受到径向压缩时内径减小。卡环6可以采用各种形式。作为示例，图6示出了一种圆环式卡环。
图6的右侧图为左侧图的剖视图。图6的右侧图显示，卡环6的内周表面呈锥形面。当然，这仅是一种示例的横截面，其也可以采用如图6所示的矩形横截面。当受到径向压紧时，这种锥面结构与受压变形的金属管的配合会提供轴向压力，从而进一步压紧橡胶密封圈，由此提供了更好的密封效果。
图7示出了一种齿环式卡环，其内部具有沿周向分布的齿状结构。这种齿状结构有助于在受到径向压紧时嵌入到***到金属管中，以提高抗拉拔强度。同样，图7所示卡环6的锥形面的内周表面结构同样可以用于图6所示的圆环式卡环。
图4所示的金属管道卡环式连接结构是这样装配的。首先将金属管7***到图3所示的已经安装了密封圈4、导向圈5、卡环6以及防渗环8的卡环式管件1承口中就位，然后使用压紧工具对卡环式管件1上的密封槽2和卡环槽3进行同时压缩至规定尺寸。此时，密封槽2受到圆周压缩迫使内部的密封圈4紧贴金属管8形成一道面密封，阻止管道内的流体泄漏，满足密封要求。同时卡环槽3受到圆周压缩迫使内部的卡环6紧紧嵌入金属管7形成一圈嵌入金属管的压缩槽，满足管道抗拉拔性能。当设有导向圈5时，导向圈5也同时在圆周上受到向内压缩，从而紧贴金属管7的外表面与卡环式管件1的内表面， 形成进一步的密封。当设有防渗环8时，防渗环8也同时在圆周上受到向内压缩，从而紧贴金属管7的外表面与卡环式管件1的内表面，形成进一步的密封。
试验数据显示，同等规格的卡环式连接的抗拉拔力是卡压式连接抗拉拔力的2.2倍以上，经改良加强后的卡环式连接抗拉拔力是同等规格卡压式连接抗拉拔力的4倍以上。
由图4中可以看出，金属管道卡环式连接结构仅在卡环式管件1上的密封槽2和卡环槽3(在同一区域)受到压紧变形，其他部位不会变形。
由图5中可以看出，尽管卡环6紧紧嵌入金属管7造成镀锌钢管外壁的镀锌层被破坏，但是渗入到卡环式管件1和***的金属管7之间的水流在到达镀锌层受损处之前就被密封圈4所阻挡，因而不会对金属管7造成腐蚀。图5中还显示，尽管卡环6紧紧嵌入金属管7造成镀锌钢管外壁的镀锌层被破坏，但由于防渗环8在卡环式管件1的承口内的轴向最外侧形成密封，外部的水分不会渗入到卡环式管件1的内部，因而也不会对金属管7造成腐蚀。换言之，本发明的结构使得所连接的镀锌钢管不会因镀锌层的破坏而导致使用寿命降低。
前述对本发明的具体示例性实施方案的描述是为了说明和例证的目的。这些描述并非想穷尽本发明，或者将本发明限定为所公开的精确形式，并且很显然，根据上述教导，可以进行很多改变和变化。对示例性实施例进行选择和描述的目的在于解释本发明的特定原理及其实际应用，从而使得本领域的其它技术人员能够实现并利用本发明的各种不同的示例性实施方案以及各种不同的选择和改变。本发明的范围意在由所附的权利要求书及其等同形式所限定。

Claims (10)

  1. 一种金属管道卡环式连接结构，其特征在于，包括：
    卡环式管件(1)，其承口端内周面上至少设有密封槽(2)和卡环槽(3)，所述卡环槽(3)位于所述密封槽(2)的轴向外侧；
    密封圈(4)，其设置在所述密封槽(2)中；
    导向圈(5)，其设置在卡环槽(3)中并位于密封圈(4)的轴向外侧，所述导向圈的内径小于密封圈的内径且大于金属管(7)的外径；以及
    金属卡环(6)，其呈具有缺口的环状，从而设置在卡环槽(3)中并位于导向圈(5)的轴向外侧，
    其中当金属管(7)***卡环式管件的承口到位时，利用压接工具压紧卡环式管件(1)的密封槽(2)和卡环槽(3)使之变形，从而通过卡环的收紧变形使金属管(7)相应变形，由此通过密封圈(4)实现金属管(7)卡环式管件(1)之间的密封连接。
  2. 根据权利要求1所述的金属管道卡环式连接结构，其特征在于，所述导向圈由工程塑料制成。
  3. 根据权利要求1所述的金属管道卡环式连接结构，其特征在于，还包括设置在金属卡环(6)轴向外侧的防渗环(8)，从而在卡环式管件(1)被压紧时从轴向外侧实现卡环式管件(1)与金属管(7)之间的密封。
  4. 根据权利要求3所述的金属管道卡环式连接结构，其特征在于，所述防渗环(8)由工程塑料制成。
  5. 根据权利要求1所述的金属管道卡环式连接结构，其特征在于，所述金属管(7)为镀锌管。
  6. 根据权利要求1所述的金属管道卡环式连接结构，其特征在于，所述金属卡环(6)的内周表面具有齿状结构。
  7. 根据权利要求1所述的金属管道卡环式连接结构，其特征在于，所述金属卡环(6)的内周表面呈锥形面。
  8. 根据权利要求1所述的金属管道卡环式连接结构，其特征在于，所述密封圈(4)的横截面的宽度大于高度。
  9. 一种金属管道卡环式连接结构，其特征在于，包括：
    卡环式管件(1)，其承口端设有密封槽(2)和卡环槽(3)；
    密封圈(4)，其设置在所述密封槽(2)中；
    金属卡环(6)，其呈具有缺口的环状，从而设置在卡环槽(3)中并便于压缩变形；以及
    导向圈(5)，其在卡环式管件(1)的承口内紧贴密封圈(4)的轴向外侧设置，所述导向圈的内径小于密封圈的内径且大于金属管(7)的外径，其中当金属管(7)***卡环式管件的承口到位时，利用压接工具压紧卡环式管件(1)的密封槽(2)和卡环槽(3)使之变形，从而实现金属管(7)卡环式管件(1)之间的密封连接。
  10. 一种金属管道卡环式连接结构，其特征在于，包括：
    卡环式管件(1)，其承口端设有密封槽(2)和卡环槽(3)；
    密封圈(4)，其设置在所述密封槽(2)中；
    金属卡环(6)，其呈具有缺口的环状，从而设置在卡环槽(3)中并便于压缩变形；以及
    防渗环(8)，其在卡环式管件(1)的承口内设置在轴向最外侧，所述防渗环(8)的直径小于密封圈(4)的直径且略大于金属管(7)的直径，从而在卡环式管件(1)被压紧时从轴向外侧实现卡环式管件(1)与金属管(7)之间的密封。
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