WO2016065648A1 - 一种管路连接管件 - Google Patents

一种管路连接管件 Download PDF

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Publication number
WO2016065648A1
WO2016065648A1 PCT/CN2014/090132 CN2014090132W WO2016065648A1 WO 2016065648 A1 WO2016065648 A1 WO 2016065648A1 CN 2014090132 W CN2014090132 W CN 2014090132W WO 2016065648 A1 WO2016065648 A1 WO 2016065648A1
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WO
WIPO (PCT)
Prior art keywords
ferrule
hole
sleeve
joint
nut
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PCT/CN2014/090132
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English (en)
French (fr)
Inventor
孙海潮
Original Assignee
孙海潮
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Publication date
Application filed by 孙海潮 filed Critical 孙海潮
Priority to PCT/CN2014/090132 priority Critical patent/WO2016065648A1/zh
Publication of WO2016065648A1 publication Critical patent/WO2016065648A1/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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/02—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member
    • F16L19/025—Pipe ends provided with collars or flanges, integral with the pipe or not, pressed together by a screwed member the pipe ends having integral collars or flanges
    • 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
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F16L19/06—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends
    • F16L19/07—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts in which radial clamping is obtained by wedging action on non-deformed pipe ends adapted for use in socket or sleeve connections

Definitions

  • the invention belongs to the industrial field and relates to a connecting pipe connecting pipes to pipes, in particular to a connecting pipe of a fluid conveying pipe.
  • connection between the pipe and the pipe, the pipe and other pipe connecting pipe parts such as welding connection, screw connection, flange connection, flare connection, and ferrule type pipe joint connection.
  • the flared port connection also called the flare connection, the flange connection, has the connection process requirement, the connection cost is low, the connection method is convenient, and the utility model can be used for the advantages of the low-hardness thin-wall metal pipe, but the sealing pressure is low.
  • the disadvantage of poor sealing reliability is usually only applicable to pipe connections with a sealing pressure of less than 8 MPa.
  • the flared connecting tube member includes a nut, a joint with an outer frustum, and sometimes a bushing.
  • the sealing principle of the flared port connection is to put the nut into the connecting pipe port, and then expand the port into the connecting pipe bell mouth, and connect the internal thread on the nut with the external thread on the joint, and the inner cone hole of the nut will connect the pipe bell mouth.
  • the extrusion forms a sealed connection on the outer frustum of the joint.
  • the disadvantage of the flared port connection is that the bell mouth is easily cracked, the bell mouth is rough and the pressure bearing capacity is weak, and when the joint of the bell mouth and the connecting pipe is subjected to corrosion and fatigue vibration, it is prone to looseness, cracking and leakage, and the prior art There is a bushing to protect the design, but the bushing only acts on the bell mouth.
  • the bushing and the connecting pipe are loosely matched, there is a gap, and the outside is in communication with the outside atmosphere, water vapor, sewage to the bell mouth and connection.
  • the erosion at the joint of the pipe is always present.
  • the joint between the bell mouth and the connecting pipe will leak due to corrosion and looseness, especially when the joint and the connecting pipe are dissimilar metals.
  • More serious electrochemical corrosion, corrosion damage is particularly obvious, such as in the connection between the copper joint and the aluminum connecting pipe, the copper joint and the aluminum connecting pipe flare directly contact to produce electrochemical corrosion between copper and aluminum, the bell mouth seal will Cracking leaks quickly, so the flare connection is not directly applicable to the connection of dissimilar metal materials.
  • the object of the present invention is to solve the problem of the above-mentioned flared port connection, and the pipe connecting pipe fitting specially provided without completely changing the structure of the outer frustum of the existing connecting joint completely solves the above-mentioned method of connecting the flared port.
  • the problem is that the connection sealing pressure is low, the sealing performance is poor, the corrosion resistance, the anti-vibration and the anti-loose performance are low, and it cannot be directly used for the connection of the dissimilar metal pipes.
  • a pipe connecting pipe member comprising a nut, a joint, a joint outer frustum and a connecting pipe bell mouth, wherein the nut is provided with an inner cone hole, and the inner sleeve hole of the nut is provided with a matching ferrule and a ferrule
  • the hollow ferrule sleeve hole is provided with an elastic groove at the bottom of the ferrule sleeve hole, and the inner sleeve cone hole is arranged in the ferrule sleeve hole, and the inner cone hole of the ferrule sleeve is composed of the inner cylindrical hole of the ferrule and the inner cone hole of the ferrule, the card
  • the set of hole wall and the outer cone of the ferrule form a ferrule bevel angle, and the outer cone of the joint outer frustum squeezes the inner cylindrical hole of the ferrule to achieve elastic sealing, and the joint outer frustum squeezes the ferrule in the inner cone hole of the connecting tube bell mouth
  • the depth of the elastic groove at the bottom of the ferrule hole is deeper than the hole depth of the cylindrical hole in the ferrule.
  • the elastic groove groove at the bottom of the sleeve hole is 0.2 to 0.8 mm.
  • the outer sleeve of the ferrule is provided with an elastic deformation groove.
  • the inner diameter of the cone hole of the ferrule is larger than the angle of the outer cone of the joint.
  • the diameter of the inner cylindrical hole of the ferrule is smaller than the outer diameter of the outer frustum of the joint, and the inner hole of the ferrule is less than 1.3 times the wall thickness of the connecting pipe.
  • the inner taper hole length and the ferrule length of the nut are both greater than 4 mm, and the inner taper hole length of the nut is smaller than the ferrule length.
  • the card sleeve is soft.
  • the invention realizes elastic sealing by pressing the inner cylindrical hole of the ferrule in the outer frustum of the joint, and the connecting pipe bell mouth in the inner cone of the ferrule in the outer frustum of the joint is realized to realize the horn slot seal and the inner cone hole extrusion ferrule of the nut Thereby squeezing the connecting pipe to realize the ferrule sealing composition.
  • the triple seal design of the elastic seal, the bell groove seal and the ferrule seal of the invention is a mutual sealing and mutual causal multiple seal structure.
  • the sleeve hole wall and the outer sleeve cone surface of the ferrule constitute the ferrule cone angle, which is the angle between the projection line of the ferrule sleeve wall and the projection line of the outer cone of the ferrule, therefore, the slant angle of the ferrule is the outer sleeve of the ferrule
  • the taper angle of the bevel when implemented, the ferrule bevel angle refers to the nip angle of the ferrule formed by the bevel angle of the ferrule used to seal the inner tapered hole between the nut and the connecting pipe.
  • the taper angle of the present invention is the angle between the center line of the corresponding tapered hole, the frustum, the ferrule, the bell mouth and the horn groove and the projection line of the cone slope.
  • connection torque is required to be stricter and the connection difficulty is increased.
  • the multiple sealing structure of the present invention does not have strict requirements on the connection torque, and the connection can be connected with a large torque when the torque is too large.
  • the seal is a failure for the bell groove seal, but the excessive torque will further improve the seal of the sleeve and the elastic seal, and the sealing performance will be further improved.
  • the inner ferrule hole of the nut is provided with a matching ferrule, which refers to the length of the taper hole in the nut, the taper angle of the cone inside the nut and the length of the ferrule, and the ferrule angle of the ferrule is matched to design, so that the ferrule is sealed and ideally obtained.
  • the taper angle of the ferrule is slightly smaller than the taper angle of the inner cone of the nut by 1 to 5 degrees, and the length of the taper hole of the nut is smaller than the length of the ferrule.
  • the matching use shows that both the inner cone hole and the ferrule of the nut play each other in the purpose of achieving the object of the invention, and are indispensable.
  • An elastic groove is arranged at the bottom of the ferrule hole.
  • the inner cylindrical hole will have an elastic deformation which is expanded in the radial direction, and the elastic seal is realized.
  • the sealing surface is Different quality metals produce different thermal expansion and contraction.
  • the elastic sealing will play a role of sealing compensation, ensuring the long-term reliability of the sealing in more demanding applications.
  • the outer wall of the inner hole of the ferrule is a cone-shaped surface, which is closely fitted with the inner cone hole of the nut, and will not be enlarged.
  • the elastic deformation of the metal is achieved by a hard extrusion seal of metal to metal.
  • the hard extrusion seal of metal to metal changes greatly in temperature; the sealing surface is different quality metal and produces different thermal expansion and contraction; when the sealing surface metal generates fatigue stress, the sealing performance may decrease or even leak.
  • the elastic groove at the bottom of the sleeve hole may be V-shaped, or may be a rectangular groove or other shape, as long as it can satisfy the elastic deformation of the inner cylindrical hole in the radial direction when the inner cylindrical hole is squeezed in the outer frustum of the joint.
  • the depth of the elastic groove at the bottom of the sleeve hole is smaller than the depth of the cylindrical hole in the sleeve, otherwise it will affect the sealing performance of the bell groove seal.
  • the width of the elastic groove at the bottom of the sleeve hole of the sleeve should not be too narrow, too narrow, and the elastic deformation is not enough, and the effect of elastic sealing cannot be achieved, nor can it be too wide and too wide, and the elastic deformation exceeds the elastic limit of the material and loses elasticity.
  • the purpose of the elastic sealing is preferably 0.2 to 0.8 mm in groove width.
  • the elastic groove at the bottom of the ferrule hole thus formed has the best sealing compensation effect when elastically sealed.
  • the inner cone hole of the ferrule is composed of a cylindrical hole in the ferrule and a horn groove in the ferrule inner cone.
  • the outer frustum of the joint can be squeezed into the inner cylindrical hole of the ferrule to realize elastic sealing.
  • the depth of the inner hole of the sleeve of the ferrule should ensure that the outer frustum of the joint firstly contacts the horn of the squeezing connecting pipe to perform the horn groove sealing, and then the elastic sealing is performed while squeezing the circular hole at the end of the cylindrical hole at the end of the ferrule sealing.
  • the depth of the cylindrical hole in the inner sleeve of the ferrule is less than 1.3 times the wall thickness of the connecting pipe to achieve the purpose.
  • the shape of the inner cylindrical hole of the ferrule can also be a tapered hole in the ferrule, and there is no substantial difference between the two, and the purpose of the elastic sealing can be achieved by the round hole of the inner circular cone of the outer frustum of the joint.
  • the inner cone hole of the ferrule is provided with a ferrule inner cone hole horn, and the connecting tube bell mouth is placed in the ferrule inner cone hole horn to generate a horn groove seal, and the sealing of the horn groove seal is more than the existing flared port. More sealed and more reliable.
  • the size of the bell mouth of the connecting pipe should be made according to the size of the inner ring hole of the ferrule.
  • the maximum radial diameter of the bell mouth is slightly smaller than the diameter of the inner cylindrical hole of the ferrule, and it is better to be completely placed in the horn of the ferrule. .
  • the outer sleeve surface of the sleeve is provided with an elastic deformation groove.
  • the inner cone hole of the nut is pressed against the outer cone surface of the sleeve, and the elastic deformation groove forms a gap.
  • the gap is The ferrule is bulged outwardly by the squeezing thrust, and elastic deformation occurs.
  • the elastic energy accumulated by the elastic deformation will effectively absorb the vibration of the connecting pipe, improve the vibration resistance of the seal, and seal against the heat rise and contraction caused by the temperature change.
  • the compensation function especially when the joint, the ferrule, the nut and the connecting pipe are used for the connection of metal of different materials, the compensation effect is greater, and the reliability of the sealing is ensured.
  • the design shape of the elastic deformation groove may be a triangle shape, an inner arc shape, or other shapes.
  • a ferrule cone is formed on the outer side of the ferrule at the joint of the cone hole groove and the ferrule sleeve wall in the ferrule.
  • the gap between the kneading surface and the inner cone hole of the nut can be used.
  • the maximum depth of the groove is 0.2 to 0.6 mm and the width is 2 to 4 mm.
  • the bevel angle of the inner cone hole of the ferrule is designed to be larger than the outer frustum of the joint. Cone angle, the bell groove seal, the sealing pressure will be concentrated at the joint of the bell mouth and the connecting pipe, the sealing surface width is narrowed, and the sealing performance is better. At the same time, the sealing pressure is concentrated at the joint of the bell mouth and the connecting pipe, and the elastic deformation groove on the outer taper surface of the corresponding ferrule obtains greater elastic energy, the vibration resistance of the seal, and the sealing compensation ability is stronger.
  • the cone angle of the inner cone hole of the ferrule is larger than the angle of the cone of the outer cone of the joint by 1 to 15 degrees.
  • the horn groove seal of the invention is squeezed and fixed between the outer frustum of the joint and the horn of the taper hole of the ferrule due to the bell mouth of the connecting pipe, and the connecting pipe does not appear loose and loose, the phenomenon of looseness, the outer taper of the joint
  • the pressing force of the table to the bell mouth of the connecting pipe is transmitted to the elastic deformation groove through the inner cone hole of the ferrule, so that the ferrule is elastically deformed, thereby bringing shock absorption, sealing compensation and the like, and the connecting tube is radially sealed when the ferrule is sealed.
  • the connecting pipe may be flattened to cause leakage, especially when connecting a low-hardness thin-walled metal connecting pipe, the connecting pipe is less rigid, the connecting pipe is more easily radially compressed and deformed, but the bell mouth is pressed and fixed. After that, the bell mouth and the ferrule sealing position are relatively close, and the connecting pipe wall of the ferrule sealing portion plays a certain supporting role, thereby eliminating the possibility that the connecting pipe is crushed and leaking, and the invention can be applied to low hardness.
  • the purpose of the thin-walled metal tube. Therefore, the bell groove seal not only serves as a sealing function, but also functions to hold the connecting tube, elastically deform the ferrule, and support the wall of the connecting tube.
  • the length of the inner taper hole of the nut is designed to be smaller than the length of the ferrule.
  • the sealing of the invention can obtain the best sealing performance
  • the length of the taper hole in the nut is designed to be smaller than the length of the ferrule, which means that the difference between the two cannot exceed the distance of the relative displacement of the screw and the joint of the joint when connecting; otherwise,
  • the ferrule is not completely squeezed into the inner tapered bore of the nut, preferably from one quarter to one half of the distance at which the nut is mechanically coupled to the joint.
  • the length of the inner taper hole of the nut is equal to or slightly larger than the length of the ferrule, and the invention can also be realized, but the length of the inner taper hole of the nut is designed to be smaller than the length of the ferrule, the elastic seal, the horn groove seal, and the distance between the ferrule seals are compact. The effect of sealing each other to compensate for the seal protection is good.
  • the inner taper hole length and the ferrule length of the nut are both greater than 4 mm, so as to ensure that the sealing surface length of the ferrule seal meets the sealing requirement when the inner cone hole of the nut is pressed against the outer cone surface of the ferrule.
  • the ferrule of the invention is completely squeezed in the inner cone hole of the nut, is elastically sealed, the horn groove is sealed, and the structural characteristics surrounded by the ferrule seal determine the ferrule Thought it is soft.
  • the soft state of the ferrule refers to the heat treatment state after the ferrule is formed and formed.
  • the metal ferrule is designed to be soft, and when it is connected with the low-hardness thin-walled metal pipe, the ferrule is more easily compressed and deformed when squeezed, so that each sealing surface is easy to obtain a reliable seal.
  • the accuracy of the ferrule, the accuracy of the nut, the accuracy of the connecting pipe, the requirements of the bell mouth process are reduced, the production cost is lowered, and the connection process requirements are facilitated.
  • the bell groove seal and the ferrule seal of the present invention are sealed, the center line of the connecting tube is subjected to an opposite direction of pressure, which protects the horn groove seal and the ferrule seal from each other, and functions as an elastic seal
  • the sealing technology requires that the center line of the bell mouth and the center line of the outer frustum of the joint overlap as much as possible, otherwise it will easily cause leakage, especially on the connection and sealing of the large-diameter connecting pipe, and the requirement for the center line coincidence is higher.
  • the ferrule sealing of the invention seals the connecting pipe and adjusts and corrects the center line of the connecting pipe and the center line of the joint, thereby achieving the adjustment and correction of the center line of the bell mouth and the center line of the outer frustum of the joint. Therefore, the ferrule seal of the present invention also functions to adjust the center line of the bell ring and the center line of the outer frustum of the joint to ensure the sealing performance of the horn seal.
  • the inner cone hole of the ferrule on the side of the ferrule at the joint of the bell mouth and the connecting tube is completely tightly pressed and attached to the bell mouth, and the ferrule serves as a lining protection function, thereby improving The pressure of the bell mouth and the connecting pipe is combined.
  • the gap between the cone hole, the ferrule and the connecting tube of the nut is closed by the slanted angle of the squeezing cone of the squeezing deformation, and the connection between the bell mouth and the connecting tube is isolated from the outside, and the corrosion is electrochemically corroded.
  • the necessary condition is that it is in the humid air, water, and the connection between the bell mouth and the connecting pipe is isolated from the outside, and the occurrence of electrochemical corrosion loses the necessary conditions, which completely eliminates the connection between the joint and the dissimilar metal connecting pipe. The problem of electrochemical corrosion is produced.
  • the nut is provided with an inner cone hole, that is, a ferrule seal, which is specially designed on the nut. It is not necessary to make structural changes to the outer frustum of the existing joint when sealing, so that the premise of not changing the existing joint structure can be implemented.
  • the object of the invention is to make the coupling nut of the invention completely interchangeable with the prior art coupling nut.
  • the taper taper angle of the outer taper taper is less than 90 degrees. If it is greater than 90 degrees, the joint becomes a joint with an inner taper hole. In this case, only one end of the taper hole in the joint is required to be sleeved.
  • the transition joint of the frustum allows the inner tapered bore joint to be transitioned to a joint having an outer frustum to practice the invention.
  • the nut of the present invention can be made into an outer hexagon shape for the tool to be attached by a torque connection.
  • a metal anaerobic adhesive can be applied between the joint surfaces of the joint and the nut, and between the sealing surfaces. Applying metal anaerobic adhesive can not only repair the sealing surface defects, but also lubricate the threaded connection and sealing surface, reduce the assembly torque, provide higher connection sealing performance, and provide high disassembly torque after connection. Reliable anti-connection loosening ability, metal anaerobic adhesive is applied, the added disassembly torque is more than several times that of the simple nut and joint thread connection, and it can not be disassembled under normal conditions, thus becoming suitable for applications where non-removable connecting pipe connections are required. may.
  • the invention can also put a heat shrinkable sleeve on the joint portion of the joint and the nut, the nut and the connecting pipe, which is beneficial to the long-term stability of the sealing performance.
  • the nut, the joint, the connecting pipe and the ferrule of the invention are made of stainless steel and alloy steel. , copper alloy, aluminum alloy and other metal materials.
  • the gap between the nut light wall hole and the connecting pipe can also be blocked by the metal anaerobic rubber seal to block the connection with the outside, and the metal anaerobic glue also provides the disassembly torque to the nut light wall hole.
  • the fluid in the present invention includes liquid and gas, and the present invention can be applied to all pipelines for conveying liquid or gas, including petroleum chemical, metallurgy, pharmaceutical, instrumentation, electric power, air conditioning, machinery, electronics, aviation, ship, In the industrial manufacturing of automobile manufacturing, hydraulic transmission, etc., all pipes and pipes, pipes and valves and pipes are connected with pipes at the interface of other equipment.
  • the present invention has the following main features:
  • the invention maintains the same connection process requirement as the connection of the flared port, the connection cost is low, the connection method is convenient, and the utility model can be used for the advantages of the low-hardness thin-wall metal pipe, and at the same time, the sealing connection with the pressure exceeding 20 MPa or more is realized. The sealing performance is increased several times.
  • the present invention is a multiple seal that maintains the desired sealing effect in the event of a failure of the horn seal. Therefore, the present invention can realize the screw connection of the maximum torque in the range of the tensile strength of the connecting pipe thread, so that the connection does not have to be overly tightened to cause the problem of the fracturing bell mouth, and the problem of the screwing does not exist naturally, and the connection installation becomes Simpler and more reliable.
  • the joint sealing portion of the present invention is completely isolated from the outside, and can be applied to the connection of the connecting pipe and the joint to the dissimilar metal without electrochemical corrosion, thereby making it possible to replace the high cost connecting pipe for the low cost connecting pipe.
  • the invention is a multiple sealed connection around the ferrule, and the ferrule is in a soft state, which is favorable for sealing the sealing surface, so that the precision of connecting the pipe fitting, the ferrule and the flared mouth is low, and the connection is simpler.
  • the connection cost is reduced, and the connection anti-vibration and anti-loose performance is better.
  • the invention has complete interchangeability with the existing connecting nut, and can replace the existing connecting nut without changing the existing joint structure and without changing the existing flare connecting process.
  • the invention has excellent elastic sealing compensation function, and the sealing performance is stable and reliable.
  • FIG. 1 is a schematic view of a connection structure of the present invention.
  • FIG. 2 is a schematic view of the structure of the nut of the present invention.
  • FIG. 3 is a schematic view of the structure of the ferrule of the present invention.
  • 1 is a joint
  • 2 is a threaded connection
  • 3 is a nut
  • 4 is a joint outer frustum bottom diameter
  • 5 is a joint outer frustum
  • 6 is an elastic seal
  • 7 is a connecting pipe flare
  • 8 is a ferrule
  • 10 is the inner cone hole of the nut
  • 11 is the taper angle of the inner cone of the nut
  • 12 is the light wall hole of the nut
  • 13 is the elastic groove of the bottom of the sleeve hole.
  • Fig. 1 is a schematic view of a connection structure of the present invention.
  • the connecting pipe member of the invention comprises a nut 3 and a ferrule 8.
  • the nut 3 and the ferrule 8 are firstly set on the connecting pipe 9, and the slant angle 18 of the ferrule is directed toward the cone angle 11 of the inner cone of the nut, and the connecting pipe 9
  • the pipe end expands the connecting pipe bell mouth 7, gently pulls the connecting pipe 9, pulls the ferrule 8 through the connecting pipe bell mouth 7 into the inner cone hole 10 of the nut, and rotates the nut 3 left and right several times until the hand feels to move, so that the connection
  • the tube bell mouth 7 and the inner sleeve hole speaker groove 15 of the ferrule, the outer wall of the sleeve hole wall 19 and the connecting tube 9, the outer cone slope 17 of the sleeve and the inner cone hole 10 of the nut are smoothly fitted to each other as much as possible, and then The nut 3 is connected to the joint 1 through the screw
  • the ferrule taper angle 18 is tapered between the inner cone hole 10 of the nut and the connecting tube 9 to realize the ferrule sealing, and is squeezed and fixed between the outer frustum 5 of the joint and the horn ferrule 15 of the ferrule.
  • the bell mouth 7 realizes the speaker slot sealing, and the round hole edge of the hole end of the cylindrical hole 14 of the ferrule and the outer frustum 5 of the joint realize the elastic sealing 6, and the connection is completed.
  • the outer diameter of the outer frustum of the joint is the maximum diameter of the bottom of the outer frustum of the joint 1.
  • the outer frustum of the joint 5 Advancing toward the inner cone hole speaker slot 15 of the ferrule, resisting and squeezing the connecting tube bell mouth 7 in the inner cone hole speaker groove 15 of the ferrule to realize the horn groove sealing, and the card is continuously squeezed with the horn groove seal
  • the sleeve elastic deformation groove 16 is elastically deformed by the thrust from the bell groove seal, and the outer flange table 5 of the joint continues to advance into the hole of the sleeve, and the round hole edge of the hole end of the cylindrical hole 14 in the sleeve is connected with the outer cone 5 of the joint.
  • the elastic sealing 6 is realized by contact extrusion, and at the same time, the inner cylindrical hole 14 of the ferrule expands outwardly to the groove formed by the elastic groove 13 at the bottom of the ferrule hole, and the sealing compensation effect is generated in the sealing.
  • the inner tapered bore 10 of the nut continuously increases the compression and compression of the connecting tube 9 by the ferrule 8 to achieve a more stable ferrule seal.

Abstract

一种管路连接管件，包括螺母（3），接头（1），接头外锥台（5）和连接管喇叭口（7），螺母（3）设有内锥孔（10），螺母内锥孔（10）内设有配套使用的卡套（8），卡套（8）为中空的卡套套孔，卡套套孔底部设有弹性槽（13），卡套套孔内设有卡套内锥孔，卡套内锥孔由卡套内圆柱孔（14）和卡套内锥孔喇叭槽（15）组成，卡套套孔壁（19）与卡套外锥斜面（17）组成卡套锥斜角（18），接头外锥台（5）挤压卡套内圆柱孔（14）实现锥面密封，接头外锥台（5）挤压卡套内锥孔喇叭槽（15）中的连接管喇叭口（7）实现喇叭槽密封，螺母内锥孔（10）挤压卡套（8）从而挤压连接管（9）实现卡套密封。该管路连接管件具有密封连接便捷，密封工艺要求低，密封性能高和可用于异种材质的低硬度薄壁金属管路的连接上，与现有技术的连接螺母完全互换性的特点。

Description

一种管路连接管件 技术领域
本发明属于工业领域，涉及一种将管子连接成管路的连接管件，特别是涉及一种流体传输管路的连接管件。
背景技术
管与管、管与其它管路连接管件之间的连接，有焊接连接，螺纹连接，法兰连接，扩喇叭口连接，卡套式管接头连接等方法。其中扩喇叭口连接,也称扩口连接，翻边连接，具有连接工艺要求、连接成本较低，连接方法便捷,可用于低硬度薄壁金属管路的优点，但存在着密封压力较低，密封可靠性较差的缺点，通常仅能应用在密封压力低于8MPa的管路连接上。扩喇叭口连接管件包括一个螺母，一个带外锥台的接头，有时还带有衬套。扩喇叭口连接的密封原理是将螺母套进连接管端口，然后将端口扩成连接管喇叭口，通过螺母上的内螺纹与接头上的外螺纹连接,由螺母内锥孔将连接管喇叭口挤压在接头外锥台上形成密封连接。扩喇叭口连接的缺点是喇叭口容易被扩裂，喇叭口较粗糙且承压能力较弱，喇叭口与连接管结合处受到腐蚀和疲劳振动时，易出现松动、破裂而泄漏，现有技术有采用衬套加以保护的设计，但衬套仅对喇叭口作用，衬套与连接管之间为松动配合，存在间隙，与外界是相通的，外界大气，水气，污水对喇叭口与连接管结合处的侵蚀，始终存在，天长日久，侵蚀到了一定程度时，喇叭口与连接管结合处就会因腐蚀产生破裂、松动而泄漏，特别在接头与连接管为异种金属的连接时，存在着更为严重的电化学腐蚀，腐蚀破坏尤为明显，如在铜接头与铝连接管的连接中，铜接头与铝连接管喇叭口直接接触而产生铜铝间的电化学腐蚀，喇叭口密封处将很快产生破裂泄漏，因此，扩喇叭口连接方式是不可直接应用于异种金属材料的连接上的。此外管子连接工作时往往处于一定的振动状态，振动带来的振动疲劳累积到一定程度时会松动连接，降低密封性能，直到彻底失去密封，扩喇叭口连接仅在喇叭口处产生密封，一旦喇叭口密封产生泄漏，就意味着连接管件失去密封。因此，寻找一种连接密封压力更高，密封性能更可靠，防腐蚀，防振，防松动性能优越，可直接用于异种金属间连接而无电化学腐蚀的连接管件,就成了人们一直渴望解决的技术难题了。
发明内容
本发明的目的正是针对上述扩喇叭口连接存在的问题，在不改变现有连接接头外锥台结构的前提下，而专门提供的管路连接管件，彻底解决了上述扩喇叭口连接方法存在的问题：连接密封压力较低，密封性能可靠性差，不能防腐蚀，防振、防松动性能低，不可直接用于异种金属间管路连接的问题。
本发明的目的是通过以下方式来实现的：
1，一种管路连接管件，包括螺母，接头，接头外锥台和连接管喇叭口，其特征是：螺母设有内锥孔，螺母内锥孔内设有配套使用的卡套，卡套为中空的卡套套孔，卡套套孔底部设有弹性槽，卡套套孔内设有卡套内锥孔，卡套内锥孔由卡套内圆柱孔和卡套内锥孔喇叭槽组成，卡套套孔壁与卡套外锥斜面组成卡套锥斜角，接头外锥台挤压卡套内圆柱孔实现弹性密封，接头外锥台挤压卡套内锥孔喇叭槽中的连接管喇叭口实现喇叭槽密封，螺母内锥孔挤压卡套从而挤压连接管实现卡套密封。
2，卡套套孔底部弹性槽槽深小于卡套内圆柱孔孔深。
3，卡套套孔底部弹性槽槽宽0.2到0.8mm。
4，卡套外锥钭面上设有弹性变形槽。
5，卡套内锥孔喇叭槽锥斜角大于接头外锥台锥斜角。
6，卡套内圆柱孔直径小于接头外锥台底径，卡套内圆柱孔孔深小于1.3倍连接管壁厚。
7，螺母内锥孔长度和卡套长度均大于4mm，螺母内锥孔长度小于卡套长度。
8，卡套为软态。
本发明由接头外锥台挤压卡套内圆柱孔实现弹性密封，接头外锥台挤压卡套内锥孔喇叭槽中的连接管喇叭口实现喇叭槽密封和螺母内锥孔挤压卡套从而挤压连接管实现卡套密封组成。本发明的弹性密封，喇叭槽密封和卡套密封的三重密封设计，是一个互为作用，互为因果的多重密封结构。卡套套孔壁与卡套外锥斜面组成卡套锥斜角是指卡套套孔壁的投影线与卡套外锥斜面投影线的夹角，因此，卡套锥斜角也就是卡套外锥斜面的锥斜角，在实施时卡套锥斜角是指用来锥进螺母内锥孔与连接管之间密封的卡套锥斜角所形成的卡套切入角。本发明的锥斜角均为相应的锥孔，锥台，卡套，喇叭口，喇叭槽的中心线与其锥斜面投影线的夹角，在连接密封时，卡套锥斜角被挤压位移的方向与螺母连接移动的方向相反，当卡套锥斜角被挤压在螺母内锥孔和连接管之间的卡套密封达到一定的密封压力时，卡套锥斜角会受到巨大的阻力而停止位移，此时，在接头外锥台的挤压作用下，实现弹性密封和喇叭槽密封，当弹性密封和喇叭槽密封达到一定的密封压力时，螺母通过连接接头继续向接头方向移动，对卡套外锥钭面继续施压，使得卡套锥钭角继续收缩而连续挤压连接管，进一步提高了卡套密封能力。原有的扩喇叭口连接，连接力矩过小，过大，过猛，喇叭口制作，喇叭口材料质量，壁厚等因素，都有可能造成喇叭口破裂而不能密封，因而扩喇叭口连接对连接力矩的大小要求较严格，增大了连接难度，但本发明的多重密封结构，对连接力矩没有严格的要求，连接时尽可用大力矩连接，当出现力矩过大使 得喇叭口破裂的极端情况时，对喇叭槽密封来讲，密封是失败了，但过大的力矩，却会起到进一步提高卡套密封，弹性密封的作用，密封性能反而会得到进一步提高。螺母内锥孔内设置有配套使用的卡套，是指螺母内锥孔长度，螺母内锥孔锥钭角与卡套长度，卡套锥钭角作匹配设计，以使卡套密封时获得理想的密封性能，本发明实施时，建议卡套锥钭角略小于螺母内锥孔锥钭角1到5度，螺母内锥孔长度小于卡套长度。配套使用表明，螺母内锥孔与卡套二者在实现本发明目的上互为作用，缺一不可。
在卡套套孔底部设有弹性槽，接头外锥台挤压卡套内圆柱孔时，内圆柱孔径向会产生扩大的弹性变形，实现的是弹性密封，当在温度变化较大，密封面为不同质金属而产生不同的热胀冷缩，密封面金属产生疲劳应力时，弹性密封就会起到密封补偿作用，确保了密封在更苛刻应用场合的长期可靠性。如果卡套套孔底部没有弹性槽，当接头外锥台挤压卡套内圆柱孔时，卡套内圆柱孔外壁为锥钭面，与螺母内锥孔是紧密贴合的，就不会产生扩大的弹性变形，实现的是金属对金属的硬挤压密封。而金属对金属的硬挤压密封在温度变化较大；密封面为不同质金属而产生不同的热胀冷缩；密封面金属产生疲劳应力时，密封性能会下降甚至发生泄漏。卡套套孔底部的弹性槽可以为V型，也可以为长方形槽或其他形状，只要能满足在接头外锥台挤压卡套内圆柱孔时，内圆柱孔径向产生扩大的弹性变形即可，但卡套套孔底部弹性槽槽深要小于卡套内圆柱孔孔深，否则，会影响到喇叭槽密封的密封性能。卡套套孔底部的弹性槽槽宽不能太窄，太窄，弹性变形不够，达不到弹性密封的效果，也不能太宽，太宽，弹性变形超过了材料的弹性极限失去弹性，达不到弹性密封的目的，以槽宽0.2到0.8mm为佳。这样形成的卡套套孔底部的弹性槽在弹性密封时产生的密封补偿作用最好。
卡套内锥孔由卡套内圆柱孔和卡套内锥孔喇叭槽组成。在卡套内圆柱孔直径小于接头外锥台底径时，接头外锥台就可挤压到卡套内圆柱孔，实现弹性密封。卡套内圆柱孔孔深要确保接头外锥台首先接触挤压连接管喇叭口实施喇叭槽密封，然后在继续喇叭槽密封的同时挤压卡套内圆柱孔孔端圆孔边实施弹性密封，通常取卡套内圆柱孔孔深小于1.3倍连接管壁厚即可达到目的。卡套内圆柱孔的形状也可为卡套内圆锥孔，二者没有实质区别，都可达到接头外锥台挤压卡套内圆孔的圆孔边实施弹性密封的目的。卡套内锥孔上设有卡套内锥孔喇叭槽，将连接管喇叭口置于卡套内锥孔喇叭槽内产生喇叭槽密封，喇叭槽密封的密封性比现有扩喇叭口连接的密封性更高，更可靠。连接时连接管喇叭口大小应根据卡套内锥孔喇叭槽的大小制作，以喇叭口最大径向直径略小于卡套内圆柱孔直径，被完全置于卡套内锥孔喇叭槽中为佳。
卡套外锥钭面上设有弹性变形槽，当螺母与接头连接时，螺母内锥孔与卡套外锥钭面挤压贴合，弹性变形槽形成空隙，在喇叭槽密封时，空隙处的卡套受到挤推力向外凸起，产生弹性变形，弹性变形蓄积的弹性能量将有效地吸收连接管的振动，提高密封的抗振性，对温度变化引起的热涨冷缩，起到密封补偿作用，特别是在接头，卡套，螺母，连接管为不同材料金属的连接应用场合时，补偿作用更大，确保了密封的可靠性。弹性变形槽的设计形状可以为三角形，内弧形，也可为其他形状，只要满足连接密封时，在卡套内锥孔喇叭槽与卡套套孔壁结合处的卡套外侧，形成卡套锥钭面与螺母内锥孔之间的空隙凹槽即可。实施时取凹槽的最大深度0.2到0.6mm，宽度2到4mm为佳。
连接管扩喇叭口时，喇叭口与连接管结合处受力变形硬化最少，较其他喇叭口位置难以出现变形缺陷，因此，将卡套内锥孔喇叭槽锥斜角设计为大于接头外锥台锥斜角,喇叭槽密封，密封压力就会集中在喇叭口与连接管结合处，密封面面宽变窄，密封性更好。与此同时，密封压力集中在喇叭口与连接管结合处，对应的卡套外锥钭面上的弹性变形槽获得的弹性能量更大，密封的抗振性，密封补偿能力更强。实施时建议卡套内锥孔喇叭槽锥斜角大于接头外锥台锥斜角1到15度。
本发明的喇叭槽密封，因连接管喇叭口被挤压固定在接头外锥台与卡套内锥孔喇叭槽之间，连接管才不会出现拉拔松动，松脱的现象，接头外锥台对连接管喇叭口的挤压力通过卡套内锥孔喇叭槽传递到弹性变形槽，使卡套产生弹性变形，从而带来吸震，密封补偿等功能，卡套密封时，连接管径向被挤压收缩，连接管有被压扁产生泄漏的可能，特别是在连接低硬度薄壁金属连接管时，连接管刚性较低，连接管更易径向压缩变形，但喇叭口被挤压固定后，喇叭口与卡套密封位置较近，对卡套密封处的连接管管壁起到一定的支撑作用，消除了连接管有被压扁产生泄漏的可能，达到本发明可应用在低硬度薄壁金属管上的目的。因此，喇叭槽密封不仅起到密封作用，还起到固持连接管，弹性变形卡套，支撑连接管管壁的作用。
将螺母内锥孔长度设计为小于卡套长度，在卡套锥钭角略小于螺母内锥孔锥钭角时，卡套就会被完全挤压在螺母内锥孔中，卡套才能被充分挤压密封，本发明的密封才能获得最佳的密封性能，螺母内锥孔长度设计为小于卡套长度，是指两者相差值不能超过连接时螺母与接头螺旋连接相对位移的距离，否则，卡套就不会被完全挤压在螺母内锥孔中，以取连接时螺母与接头螺旋连接相对位移的距离的四分之一到二分之一为佳。螺母内锥孔长度等于或略大于卡套长度，也可实现本发明，但不如将螺母内锥孔长度设计为小于卡套长度时，弹性密封，喇叭槽密封，卡套密封之间距离来得紧凑，互相密封补偿密封保护的效果好。螺母内锥孔长度和卡套长度均大于4mm，才能确保螺母内锥孔挤压卡套外锥钭面时卡套密封的密封面长度达到密封要求。
本发明的卡套被完全挤压在螺母内锥孔中，被弹性密封，喇叭槽密封，卡套密封包围的结构特点决定了卡套可 以为软态。卡套为软态是指卡套加工成形后的热处理状态。将金属卡套设计成软态，在与低硬度薄壁金属管路连接时，卡套受到挤压时更易压缩变形，便得各密封面易获得可靠的密封。与此同时，对卡套精度，螺母精度，连接管精度，喇叭口工艺要求降低，生产成本下降，连接工艺要求变得便捷。本发明的喇叭槽密封与卡套密封时，连接管中心线上会受到一个方向相反的压力，该压力对喇叭槽密封与卡套密封互为保护，起到弹性密封补偿的作用。
密封技术要求喇叭口中心线与接头外锥台中心线尽可能重合，否则容易引起泄漏，特别是在大口径连接管的连接密封上，对中心线重合的要求更高。本发明中的卡套密封，卡套将连接管密封的同时，对连接管中心线与接头中心线起到调整纠偏的作用，从而达到对喇叭口中心线与接头外锥台中心线的调整纠偏，因此，本发明中的卡套密封还起到调整纠偏喇叭口中心线与接头外锥台中心线的作用，确保喇叭槽密封的密封性能。
喇叭槽密封时，喇叭口与连接管结合处卡套一侧的卡套内锥孔喇叭槽是完全严密地挤压贴合着喇叭口的，此时卡套起到一个衬托保护作用，提高了喇叭口与连接管结合处承压能力。卡套密封时，螺母内锥孔，卡套，连接管三者之间的间隙被挤压变形的卡套锥斜角封闭，隔绝了喇叭口与连接管结合处与外界的相通，电化学腐蚀发生的必要条件是要处于湿空气，水之中，隔绝了喇叭口与连接管结合处与外界的相通，电化学腐蚀的发生失去必要条件，也就彻底消除了接头与异种金属连接管连接时产生电化学腐蚀的问题。
螺母设有内锥孔，即卡套密封，是专门设计在螺母上的，密封时无需对现有接头外锥台作结构上的改变，从而达到不改变现有接头结构的前提下，实施本发明的目的，使得本发明的连接螺母与现有技术的连接螺母具有了完全的互换性。
现有技术中的接头外锥台锥斜角小于90度，如果大于90度，接头就成了具有内锥孔的接头了，此时，仅需在接头内锥孔上套接一个两头为外锥台的过渡接头，就可将内锥孔接头过渡到具有外锥台的接头上来实施本发明。本发明的螺母可制作成外六角形，便于工具施加力矩连接安装。
本发明可在接头与螺母螺纹连接处，各密封面间，施涂金属厌氧胶。施涂金属厌氧胶，不但可以起到修补密封面的缺陷，润滑螺纹连接及密封面,减小装配力矩,提供更高的连接密封性能，连接后,还可提供高拆卸力矩，具有了更可靠的防连接松动能力，施涂金属厌氧胶，增加的拆卸力矩是单纯的螺母与接头螺纹连接的数倍以上，正常情况下不可拆卸，从而为应用在要求不可拆卸的连接管连接场合成为可能。本发明又可在接头与螺母，螺母与连接管的连接部位套上热缩套管，有利于密封性能的长期稳定性，本发明中的螺母，接头，连接管，卡套采用不锈钢，合金钢，铜合金，铝合金等金属材料制作。螺母光壁孔与连接管的间隙也可通过金属厌氧胶密封来封堵与外界的相通，同时，金属厌氧胶也会对螺母光壁孔提供拆卸力矩。
本发明中的流体包括液体和气体，本发明可用于所有输送液体或气体的管路连接上，包括石油子化工，治金，制药，仪器仪表，电力，空调，机械，电子，航空，船舶，汽车制造，液压传动等工业制造中所有管与管，管与阀及管与其他设备接口处的管路连接。
由于采用了上述技术方案，本发明具有如下主要特点：
1，本发明保持了与扩喇叭口连接的连接工艺要求相同,连接成本较低，连接方法便捷，可用于低硬度薄壁金属管路的优点的同时，实现承压超过20MPa以上的密封连接,密封性能获得数倍提高。
2，本发明为多重密封，可在喇叭槽密封失效的情况下，仍能保持理想的密封效果。因而，本发明可在连接管件螺纹抗拉强度范围，实施最大力矩的螺旋连接，使得连接不必顾忌过拧紧造成压裂喇叭口的问题，拧不紧的问题也就自然不存在，连接安装变得更简捷，更可靠。
3，本发明连接密封部分与外界彻底隔离，可应用在连接管与接头为异种金属的连接上而无电化学腐蚀，从而为低成本连接管取代高成本连接管的应用成为可能。
4，本发明为围绕卡套的多重密封连接，且卡套为软态，有利于挤压密封面的密封，因而对连接管件，卡套，扩喇叭口精度要求较低，连接时更为简便，连接成本下降，连接抗振防松动性能更优。
5，本发明与现有连接螺母有着完全的互换性，可在不改变现有接头结构，不改变现有扩喇叭口连接工艺的前提下，取代现有连接螺母。
6，本发明具有优良的弹性密封补偿功能，密封性能稳定可靠。
附图说明
说明书附图1是本发明的连接结构示意图。
说明书附图2是本发明的螺母结构示意图。
说明书附图3是本发明的卡套结构示意图。
具体实施方式
下面结合附图和实施例对本发明作进一步说明：
附图中1为接头，2为螺纹连接，3为螺母，4为接头外锥台底径，5为接头外锥台，6为弹性密封,7为连接管喇叭口，8为卡套,9为连接管，10为螺母内锥孔，11为螺母内锥孔锥斜角,12为螺母光壁孔，13为卡套套孔底部弹性槽 ，14卡套内圆柱孔，15卡套内锥孔喇叭槽，16为卡套弹性变形槽，17为卡套外锥钭面，18为卡套锥斜角，19为卡套套孔壁。
实施例：图1为本发明的连接结构示意图。本发明连接管件包括螺母3和卡套8，连接时，先将螺母3，卡套8依次套装在连接管9上，卡套锥斜角18朝向螺母内锥孔锥钭角11，连接管9管端扩连接管喇叭口7，轻拉连接管9，将卡套8通过连接管喇叭口7拉入螺母内锥孔10内，左右旋转螺母3数次，直到手感拉不动为止，使得连接管喇叭口7与卡套内锥孔喇叭槽15，卡套套孔壁19与连接管9的外壁，卡套外锥斜面17与螺母内锥孔10相互间尽可能地平滑贴合在一起，然后将螺母3通过螺纹连接2与接头1连接，直到手感拧不动为止，接着对螺母3施加力矩，当手感力矩突然加大时继续螺旋1到2圈为止。此时，卡套锥斜角18锥入螺母内锥孔10与连接管9之间实现卡套密封，被挤压固定在接头外锥台5和卡套内锥孔喇叭槽15之间的连接管喇叭口7实现喇叭槽密封，卡套内圆柱孔14的孔端圆孔边与接头外锥台5实现弹性密封6，连接完成。接头外锥台底径4为接头1的外锥台底部最大直径，当卡套内圆柱孔14直径小于接头外锥台底径4，卡套内圆柱孔14满足一定深度时，接头外锥台5朝着卡套内锥孔喇叭槽15方向推进，抵触并挤压卡套内锥孔喇叭槽15中的连接管喇叭口7，实现喇叭槽密封，随着喇叭槽密封的不断挤压，卡套弹性变形槽16受到来自喇叭槽密封的推力，发生弹性变形，接头外锥台5继续向卡套孔内推进，卡套内圆柱孔14的孔端圆孔边就会与接头外锥台5接触挤压，实现弹性密封6，与此同时，卡套内圆柱孔14向卡套套孔底部弹性槽13形成的槽隙外扩产生弹性，在密封中对密封产生密封补偿作用。随着螺母3与接头1的螺纹连接2的连续螺旋连接,螺母内锥孔10通过卡套8不断增大对连接管9的压缩挤压，实现更稳固的卡套密封。

Claims (8)

  1. 一种管路连接管件，包括螺母，接头，接头外锥台和连接管喇叭口，其特征是：螺母设有内锥孔，螺母内锥孔内设有配套使用的卡套，卡套为中空的卡套套孔，卡套套孔底部设有弹性槽，卡套套孔内设有卡套内锥孔，卡套内锥孔由卡套内圆柱孔和卡套内锥孔喇叭槽组成，卡套套孔壁与卡套外锥斜面组成卡套锥斜角，接头外锥台挤压卡套内圆柱孔实现弹性密封，接头外锥台挤压卡套内锥孔喇叭槽中的连接管喇叭口实现喇叭槽密封，螺母内锥孔挤压卡套从而挤压连接管实现卡套密封。
  2. 根据权利要求1所述的一种管路连接管件，其特征是：卡套套孔底部弹性槽槽深小于卡套内圆柱孔孔深。
  3. 根据权利要求1所述的一种管路连接管件，其特征是：卡套套孔底部弹性槽槽宽0.2到0.8mm。
  4. 根据权利要求1所述的一种管路连接管件，其特征是：卡套外锥钭面上设有弹性变形槽。
  5. 根据权利要求1所述的一种管路连接管件，其特征是：卡套内锥孔喇叭槽锥斜角大于接头外锥台锥斜角。
  6. 根据权利要求1所述的一种管路连接管件，其特征是：卡套内圆柱孔直径小于接头外锥台底径，卡套内圆柱孔孔深小于1.3倍连接管壁厚。
  7. 根据权利要求1所述的一种管路连接管件，其特征是：螺母内锥孔长度和卡套长度均大于4mm，螺母内锥孔长度小
    于卡套长度。
  8. 根据权利要求1所述的一种管路连接管件，其特征是：卡套为软态。
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GB1275348A (en) * 1969-07-07 1972-05-24 Hermes Werke Leopold Herrmann A screw socket fitting for pipe joints
CN202252456U (zh) * 2011-10-10 2012-05-30 上海奔泰水处理设备有限公司 管接头
CN103604012A (zh) * 2013-04-13 2014-02-26 孙海潮 一种专用于分体式空调制冷剂连接管路的连接螺母
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