WO2013060271A1 - 长度可调节防拆卸表用管螺纹活接头连接结构 - Google Patents

长度可调节防拆卸表用管螺纹活接头连接结构 Download PDF

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Publication number
WO2013060271A1
WO2013060271A1 PCT/CN2012/083426 CN2012083426W WO2013060271A1 WO 2013060271 A1 WO2013060271 A1 WO 2013060271A1 CN 2012083426 W CN2012083426 W CN 2012083426W WO 2013060271 A1 WO2013060271 A1 WO 2013060271A1
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WO
WIPO (PCT)
Prior art keywords
thread
nut
cylindrical
external
pipe
Prior art date
Application number
PCT/CN2012/083426
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English (en)
French (fr)
Inventor
周俊
Original Assignee
上海泛华紧固系统有限公司
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Filing date
Publication date
Application filed by 上海泛华紧固系统有限公司 filed Critical 上海泛华紧固系统有限公司
Publication of WO2013060271A1 publication Critical patent/WO2013060271A1/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
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
    • F16L15/02—Screw-threaded joints; Forms of screw-threads for such joints allowing substantial longitudinal adjustment by use of a long screw-threaded part
    • 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
    • F16L19/005—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 comprising locking means for the threaded 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
    • 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
    • F16L19/028—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 the collars or flanges being obtained by deformation of the pipe wall
    • F16L19/0286—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 the collars or flanges being obtained by deformation of the pipe wall and being formed as a flange

Definitions

  • the present invention relates to a pipe thread union connection structure for pipe connection. Background technique
  • the prior art watch joint is composed of a single-headed pipe male member 1, a nut 2 and a sealing gasket 3, which are flanged at one end.
  • the threaded end 11 of the male external threaded piece is connected to other internally threaded elements (such as internally threaded valves or pipe ferrules) in the pipe, and the other end is a flange face 12 pipe joint structure connected to the nut head 21, flange
  • the surface nozzle 13 is inserted into the surface of the watch to limit the position of the external threaded member of the single-headed pipe at the surface of the watch.
  • the female threaded end 22 of the nut is connected to the external thread 42 of the watchhead, and the flange end of the other end 21 and the externally threaded member of the single-headed pipe 12 connected.
  • the mechanical connection is made by the continuous tightening of the internal thread 22 of the nut and the external thread 42 of the surface of the mouth, and the end face 12 of the externally threaded part of the single-headed tube presses the sealing ring 3 to the external end surface 41 of the surface of the surface to achieve the axial end face sealing effect. .
  • This type of table joint is inferior in that the seal is obtained by axially pressing the seal ring 3 between the flange end face 12 of the outer-threaded member and the outer end face 41 of the facepiece by the nut 2, without any Retractable margin, otherwise the seal cannot be guaranteed. Therefore, the axial spacing of the watch installation is very high, and the allowable error range is small, which brings great inconvenience to the installation and maintenance.
  • the existing method and the method for preventing the disassembly of the watch joint have the disadvantages of complicated structure, high cost and easy disassembly, and are not easy to be popularized. Summary of the invention
  • the length adjustable detachable table pipe thread joint connection structure provided for the foregoing problems, the column/column thread pair is matched with the adjustable axial length, and has good joint strength, sealing performance and detachment prevention effect.
  • the outer threaded part, the reducing nut, the positioning sealing nut, the external thread of the gauge, the lock nut and the set screw has a cylindrical external thread
  • the reducing nut has a first cylindrical internal thread and a second
  • the internal thread of the cylinder the positioning sealing nut is matched with the reducing nut by the cylindrical external thread and the reducing nut at the reducing diameter
  • the positioning sealing nut is matched with the external thread end surface of the surface
  • the external cylindrical thread meshes with the first cylindrical internal thread to form a mechanical connection.
  • the first connecting thread pair, the external thread of the surface and the second cylindrical internal thread are screwed into a second connecting thread pair for mechanical connection, and at the same time, the internal thread of the positioning sealing nut is engaged with the external thread of the cylinder to form a sealed connection.
  • the function of the modified sealing thread pair, the positioning sealing nut and the external thread end surface of the surface mouth form an axial end face positioning and an end face sealing
  • the locking nut is meshed by the external cylindrical thread to the outer diameter of the first internal thread of the reducing nut and the reducing nut produces a double nut mutual Lock function, which constitutes the anti-disassembly lock nut pair under the action of the set screw
  • the positioning seal nut is on the external thread of the cylinder
  • the precession position determining the length adjustment.
  • the length adjustable detachable table pipe thread joint connection structure is further characterized in that the pipe outer screw member, the reducer nut, the lock nut is a pipe member or a casting or a forging.
  • the length adjustable detachable table pipe thread joint connection structure is further characterized in that the pipe outer screw member has a cylindrical external thread, or one end has an external thread structure matched with the pipe element, and the other end has Cylindrical external thread.
  • the length adjustable detachable table pipe thread joint connection structure is further characterized in that the positioning sealing nut has a rod portion, and the height of the rod portion is at least larger than a pitch of the cylindrical external thread of the external threaded piece of the pipe, and the diameter is reduced.
  • the variable diameter of the nut has a transition hole, and the rod portion extends into the transition hole to form a shaft hole fit.
  • the shaft hole fits in a conical/cylindrical surface fit or a conical/conical surface fit or a cylindrical surface/ Cylindrical fit, cylindrical or conical surface is a smooth plane or thread or other mechanical pattern.
  • the length adjustable detachable table pipe thread joint connection structure further characterized in that the positioning sealing nut has an internal thread and a positioning end face, and the positioning sealing nut is screwed
  • the cylindrical external thread between the first connecting thread pair and the external thread of the surface has the function of adjusting the length of the joint.
  • the length can adjust the pipe joint connection structure of the anti-disassembly table, and the further feature is that the positioning seal nut is made of a material having a softer hardness than the reducer nut and the pipe outer screw.
  • the length adjustable detachable table pipe thread joint connection structure is further characterized in that the cylindrical outer thread is a roll formed pipe thread.
  • the length adjustable detachable table pipe thread joint connection structure is further characterized in that the second cylindrical internal thread of the reducer nut is a cylindrical internal thread or a tapered internal thread matched with the external thread of the surface.
  • the length adjustable detachable table pipe thread joint connection structure further characterized by: a lock nut and a set screw, the lock nut and the reducer nut form a double nut interlock, the lock nut
  • the external force surface has an internal thread hole perpendicular to the external thread of the cylinder, and the set screw in the internal thread hole is locked and mechanically contacts the external thread of the cylindrical thread to generate a screwing resistance, and the lock nut and the reducer nut constitute a disassembly prevention Lock nut pair.
  • a pipe thread joint connection structure for length adjustable detachment prevention table which further includes an outer pipe threaded member, a reducer nut, a positioning sealing washer, a surface external thread, a lock nut, and
  • the set screw has a cylindrical external thread
  • the reducer nut has a first cylindrical internal thread and a second cylindrical internal thread
  • the positioning sealing washer generates a third cylindrical internal thread when the cylindrical external thread is screwed into the external threaded part of the pipe.
  • the positioning sealing washer is matched with the reducing nut by the cylindrical external thread and the reducing nut at the reducing diameter
  • the positioning sealing gasket is matched with the external thread end surface of the surface
  • the external cylindrical thread meshes with the first cylindrical internal thread to form a mechanical connection.
  • Connecting thread pair, external thread of the mouth and internal thread of the second cylinder The meshing is tightened into a second connecting thread pair that acts as a mechanical connection, and at the same time, the third cylindrical internal thread engages with the external cylindrical thread to form a variable sealing thread pair for sealing connection, and the positioning sealing gasket and the external end surface of the surface of the surface are formed.
  • the axial end face is positioned and the end face is sealed, and the lock nut and the external thread of the cylinder are engaged to the outer end of the first internal thread of the reducer nut and the reducer nut has a double nut interlock function, and the anti-disassembly lock nut pair is formed under the action of the set screw
  • the position of the positioning sealing washer on the external thread of the cylinder determines the adjustment length, and the thickness of the positioning sealing gasket is at least larger than a pitch of the external cylindrical thread of the external threaded part of the pipe.
  • the above-mentioned length adjustable detachable table pipe thread joint connection structure retains one end of the external thread of the external threaded pipe of the conventional table joint pipe, and retains the internal thread of the nut and the end face of the seal ring which mechanically connect with the external thread of the watch mouth
  • the sealing feature consciously fits the fixed sealing joint between the flange face port, the nut head and the sealing gasket integrally manufactured with the externally threaded piece, and is respectively transformed into the cylindrical external thread and the reducing nut of the externally threaded part of the pipe.
  • An adjustable length of the column/column threaded connection between the first cylindrical internal thread and the positioning sealing nut, the sealing gasket of the end sealing only is modified to have both an internal thread variation seal and an end face seal, and at the same time
  • the positioning sealing nut is similar to the positioning of the end face of the flange surface, thus forming a pipe joint connection structure for the adjustable length of the pipe.
  • the internal thread of the lock nut and the starting point of the first internal thread of the reducer nut are different from each other to generate a mutual locking principle, thereby achieving the purpose of locking the reducer nut.
  • An internal threaded hole perpendicular to the external thread of the cylinder is formed on the external force surface of the lock nut, and screwing the set screw into the internally threaded hole mechanically contacts the external thread of the cylindrical thread to generate a screwing resistance similar to that of the positioning pin,
  • the lock nut itself has an anti-disassembly function, and constitutes a detachable lock nut pair of the reducer nut and the lock nut.
  • the method for positioning the end face of the sealing nut and the end face sealing, the internal thread variation sealing and the locking function of the locking nut are firstly screwing into the locking nut, the reducing nut and the positioning sealing from the cylindrical external thread end of the external threaded part of the pipe, respectively.
  • the nut is followed by the external torque to tighten the reducer nut to the external thread of the watchhead.
  • the outer circular surface and the end surface of the positioning seal nut are respectively squeezed by the inner taper surface of the reducer nut and the outer end surface of the surface of the reducer.
  • the component force and the radial component force cause the internal thread of the positioning sealing nut to deform relative to the external thread of the cylinder, so that the internal and external threads of the inner and outer thread sealing fitting section generate at least one of the crest, the bottom and the flank.
  • the threads are completely tight and form a reliable seal. Due to the variation of the thread profile angle of the sealing mating section, the threaded pair of the sealing mating section has a certain self-locking function, and does not require any filler to ensure good sealing during use.
  • the positioning seal nut of the seal fitting section should be made of a material with a softer hardness than the variable diameter nut and the externally threaded part of the rolled pipe, or a metal composite material and a non-metal material. Such as PE materials.
  • a suitable sealing medium such as a sealing gasket, between the first cylindrical internal thread and the positioning sealing nut.
  • the height of the positioning seal nut stem is at least greater than a pitch of the cylindrical outer thread of the outer threaded member.
  • the inner circular surface of the reducing nut and the outer circular surface of the positioning sealing nut can have various matching forms such as: conical surface / cylindrical surface matching or conical surface / conical surface matching or cylindrical surface and cylindrical surface matching
  • the inner and outer surfaces of the cylinder or the inner and outer surfaces of the cone may be smooth flat surfaces, or may be threads or other mechanical patterns.
  • the cylindrical external thread of the piece is deformed to fill the crest, the bottom and the flank of at least one external thread, thereby functioning as a seal.
  • the thickness of the positioning sealing gasket is at least one pitch larger than the external cylindrical thread of the external threaded piece of the pipe, but the positioning effect is not as good as the positioning sealing nut of the same thickness as described above.
  • the method for causing the lock nut to generate the locking function is to apply torque to the external force surface of the lock nut, and screw the lock nut to the outer end surface of the first internal thread of the reducer nut, and the lock nut is fitted with the reducer nut.
  • a new combination nut with different thread spiral starting points is formed, and the combination nut pair has a self-locking function.
  • Cylindrical outer snail with lock nut, reducer nut and positioning seal nut post/column The length of the grain depends on the demand of the product, but the minimum length is not less than the sum of the length of the first cylindrical internal thread of the reducer nut, the thickness of the positioning seal nut and the thickness of the lock nut, and the length adjustment margin is left, taking into account the outside of the watch mouth.
  • the inner bore of the thread effectively adjusts the depth, and the length of the polished rod portion of the outer threaded member depends on the product requirements.
  • the foregoing technical solution fully utilizes the advantages of the column/column pipe thread matching mechanical connection strength, the pipe connection length can be adjusted, and the like, and the technical characteristics of the internal sealing nut sealing seal, the end face sealing and the end face positioning of the positioning sealing nut are generated, thereby allowing two connections to be required.
  • the pipe components have the advantage of large expansion allowance, which is convenient for installation and maintenance.
  • the technical features of double nut mutual locking and set screw positioning and locking are utilized, so that the technical solution has the function of self-locking and anti-disassembly; The convenience, functionality and safety of the pipe network connection are much better than the current table joints.
  • FIG. 1 is a schematic view showing the structure of a joint for use in the prior art.
  • Fig. 2 is a schematic view showing the structure of a pipe thread joint of a watch according to an embodiment of the present invention.
  • Figure 3 is a schematic view showing the structure of the externally threaded member of Figure 2;
  • Figure 4 is a schematic view of the reducer nut structure of Figure 2.
  • Figure 5 is a schematic view of the structure of the positioning seal nut of Figure 2.
  • Figure 6 is a schematic view of the external thread structure of the surface of Figure 2.
  • Figure 7 is a schematic view of the structure of the lock nut of Figure 2.
  • Figure 8 is a schematic view of the locking screw structure of Figure 2.
  • Figure 9 is a schematic view of the structure of the pipe thread joint of Figure 2 after mechanical connection, sealing and locking.
  • Figure 10 shows the internal thread of the positioning seal nut and the positioning end face which are threaded and mutated separately from the external thread of the cylinder under the double axial compression of the reducer nut and the external end face of the bevel.
  • the sealing and the external thread end face of the watch mouth produce a comparison diagram before and after the end face positioning seal.
  • Figure 1 1 is a front view of the lock nut and the reducer nut before and after the double nut interlocking function.
  • Figure 12 is a comparison diagram of the tightening function of the set screw to prevent the lock nut from being detached.
  • Figure 13 is a schematic view showing the structure of a pipe thread joint of a table according to still another embodiment of the present invention.
  • Figure 14 is a schematic view showing the structure of a pipe thread joint of a table according to still another embodiment of the present invention.
  • Figure 15 is a schematic illustration of a domestic gas meter prior to installation in accordance with an embodiment of the method of the present invention.
  • Fig. 16 is a schematic view showing the length adjustment of 5 mm in the pipe thread joint of Fig. 15 after installation.
  • Figure 17 is a schematic view of the pipe thread joint positioning sealing nut of Figure 15 after horizontal positioning.
  • Fig. 18 is a schematic view of the pipe thread joint of Fig. 15 and the gas meter mounting positioning double nut being locked.
  • Fig. 19 is a schematic view of the pipe thread joint of Fig. 15 and the gas meter mounted and locked to prevent disassembly. detailed description
  • the pipe thread joint connection structure includes a pipe outer screw member 1, a reducer nut 2, a positioning seal nut 3, a gauge outer thread 4, a lock nut 5, and Set screw 6.
  • one end of the outer threaded member 1 is a conical outer thread 1-1, the other end is a cylindrical outer thread 13, and the middle is an incomplete pipe thread or the pipe body itself 12.
  • 1 1 Matches the connection with other internally threaded components (such as internally threaded valves or hose clamps) in the pipeline. As shown in FIG.
  • the reducing nut 2 has a first cylindrical internal thread 21 and a second cylindrical internal thread 23, and the variable diameter 22 of 21 and 23 is a conical surface, and the external force surface of the reducing nut can be designed as a hexagon or an octagonal Or other forms of external force acting on the outer side of the reducer nut by a wrench or the like.
  • the positioning sealing nut 3 has an outer tapered surface 31, an internal thread 32, and a positioning flat end surface 33.
  • the external thread 4 of the crown has a flat end surface 41 and an external thread 42.
  • the lock nut 5 has an internal thread 51 and an internally threaded hole 52 on the external force surface perpendicular to the external cylindrical thread.
  • the inner angle setting screw has a length smaller than the wall thickness of the lock nut 5, and can be screwed in or out by a special inner pentagon wrench tool.
  • the lower end of the external threaded member 1 is a cylindrical external thread 13, which corresponds to a screw, a first cylindrical internal thread 21 of the reducing nut 2, an internal thread 32 of the positioning sealing nut 3, and a locking mechanism.
  • the internal thread 51 of the nut 5 is the same internal thread, or both can be meshed with the same external thread, such as the cylindrical external thread 13, which is only used as a column/column thread before the reducing nut is tightened. The role of the connection.
  • the inner tapered surface 22 and the outer tapered surface 31 are a pair of mating faces, and the minimum outer diameter of the inner tapered surface 22 is smaller than the smallest outer diameter of the outer tapered surface 31. Therefore, when the rod portion of the positioning sealing nut 3 enters the reducing portion of the reducing nut 2, the inner tapered surface 22 and the outer tapered surface 31 are matched in a line contact manner, that is, one turn and outer tapered surface 31 of the inner tapered surface 22.
  • the end edge contact under the axial force of the external thread end face 41 of the watch mouth, a certain pressing force is generated at the contact portion to make the internal thread mutate. As shown in FIG.
  • the lock nut 5, the reducer nut 2, and the positioning seal nut 3 are sequentially screwed onto the external cylindrical thread 13, respectively, and the position of the seal nut 3 is determined by the length adjustment distance.
  • the positioning sealing nut 3 is screwed and fixed to the position required for the external cylindrical thread 13, and then the second cylindrical internal thread 23 of the reducing nut is aligned with the external thread 42 of the surface of the table, and the external force surface of the reducing nut 2 is A torque is applied to move the first cylindrical internal thread 21 of the reducing nut on the cylindrical external thread 13 while the second cylindrical internal thread 23 is locked in the direction of the external thread 42 of the watch. As shown in FIG.
  • the thread pair obtains a reliable column/column threaded fit seal, and at the same time, the positioning seal nut end face 33 is pressed against the external thread end face 41 to obtain a reliable end face positioning and sealing.
  • the externally threaded cylindrical external thread 13 and the externally threaded surface 42 are respectively engaged with the first cylindrical internal thread 21 and the second cylindrical internal thread 23 to form a cylindrical tube threaded coupling pair for mechanical connection, and the cylindrical external thread 13 and positioning
  • the meshing between the internal threads 32 of the sealing nut forms a variegated cylindrical pipe thread sealing pair mainly for the screwing of the column/column pipe, and the positioning sealing nut end face 33 and the external end surface 41 of the surface of the bead are pressed tightly to form a main end face fit.
  • End face positioning seal pair with positioning and sealing action As shown in FIG. 11, the lock nut 5 moves on the cylindrical external thread 13, and when the lock nut 5 is attached to the outer end surface of the first internal thread 21 of the reducer nut, the lock nut 5 and the reducer nut 2 are combined into a new one.
  • a nut pair with interlocking function As shown in FIG. 12, in the internally threaded hole 52 in which the external force surface of the lock nut 5 is perpendicular to the external cylindrical thread, the mechanical contact between the set screw 6 to the internally threaded hole 52 and the external thread of the cylindrical external thread 13 is similar.
  • the positioning seal nut in the threaded pair of the cylindrical cylinder of the sealing compound is made of a material having a softer hardness than the variable diameter nut and the externally threaded part of the rolled tube, and may also be a metal composite material and Non-metallic materials, such as PE materials.
  • the fitting of the outer tapered surface 31 of the rod portion may also have various alternative fitting forms, such as: a conical surface/cylindrical surface fitting or a cylindrical surface matching the cylindrical surface, and the inner and outer surfaces of the cylinder or the inner and outer surfaces of the cylinder may be Smooth flat, can also be thread or other mechanical pattern.
  • a domestic gas meter installation project with full rolling pipe thread connection. the way.
  • the valve A and the pipe clamp B used to connect the gas meter inlet and outlet in the pipeline project have been installed in place, and it is necessary to install and connect the gas meter. Since the valve A and the pipe clamp B have different length dimensions, the height difference is 5 ⁇ , and the gas meter cannot be directly installed.
  • FIG. 16 shows the C and D sets of such length adjustable detachable table pipe thread union assemblies, including the rolled pipe male screws C1 and Dl, the reducing nuts C2 and D2, the positioning seal nuts C3 and D3 , and lock nuts C5 and D5.
  • the threaded engagement between the external threaded part 1 and the valve A and the tube B in the two sets of products C and D is the usual threaded screw tight sealing connection; the two sets of lock nuts C5 and D5, The reducing nut C2 and D2, and the positioning sealing nut C3 and D3 respectively mesh with the cylindrical external thread of the screwed externally threaded piece to form a column/column pipe threaded connection pair, and the positioning sealing nut C3, D3 and the outer cylinder
  • the fit between the threads is a standard column/column thread fit, and the level of the two sets of joints is adjusted through the C3 and D3 and the externally threaded cylindrical external thread.
  • FIG. 17 shows that after the adjustment of the two sets of unions, the positioning seal nuts C3 and D3 are at the same level.
  • the two variable diameter nuts C2 and D2 are respectively rotated by the left and right sides.
  • the installation level of the gas meter is not bad.
  • connection of D2 to the external thread of the watch head is a non-seal connection of the column/column fit.
  • the tightening nuts C2 and D2 are tightened, and the internal threads of the positioning seal nuts C3 and D3 are gradually squeezed by the tapered inner surface of the reducer nut and the outer end of the outer diameter of the surface of the reducer nut C2 and D2.
  • the internal thread gradually mutates during the screwing process and gradually conforms to the crest, tooth surface and bottom of the external thread of the rolling cylinder, reaching at least one The sealing effect of the thread; at the same time, the positioning end faces of C3 and D3 are pressed against the end faces of the external threads of the surface to produce the end face positioning and sealing effect.
  • the tightening nuts C5 and D5 are tightened to fit the outer end faces of the first internal threads of the reducer nut to form a double nut to lock each other.
  • the set screws C6 and D6 are finally screwed into the internal threaded holes of the lock nut to the cylindrical external thread to make mechanical contact positioning, forming a locking prevention Remove the nut pair.
  • the external thread of the surface may be a cylindrical external thread structure, or as shown in FIG. 13, which is a conical external thread structure, and the second cylindrical internal thread of the reducing nut is a conical internal thread matching the external thread of the surface or Internal thread of the cylinder.
  • the threaded structure of the outer threaded piece and the pipe element is a taper external thread, or as shown in Fig. 14, it is a cylindrical outer thread or a conical internal thread or a cylindrical internal thread.
  • the various external threads described above may be roll forming, extrusion molding or cutting forming; the internal thread of the reducing nut may be cut or formed by extrusion.
  • the lock nut is positioned by the set screw or the anti-loose principle or the thrust washer between the lock nut and the reducer internal thread. It can also be a conventional positioning and locking method for other bolts and nuts.
  • the internal screw hole of the fixed screw is made on the external force surface of the reducer nut, and the set screw is vertically meshed with the external thread of the watch mouth to lock the reducer nut.
  • the configurations of the foregoing embodiments may also be combined with each other.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Joints With Pressure Members (AREA)

Abstract

长度可调节防拆卸表用管螺纹活接头连接结构所要解决的技术问题是当今表接头长度不可调节和防拆卸结构复杂，属于管道连接技术。其特征是，包括具有圆柱外螺纹的管外螺纹件、具有第一和第二内螺纹的变径螺母、定位密封螺母、表口外螺纹、锁紧螺母以及紧定螺钉。圆柱外螺纹与第一内螺纹、定位密封螺母以及锁紧螺母啮合成柱/柱连接螺纹副，表口外螺纹与第二内螺纹啮合成机械连接螺纹副，定位密封螺母在变径螺母变径处锥面和表口外螺纹端面双重轴向挤压下，与圆柱外螺纹啮合变异成密封螺纹副，与表口外螺纹端面形成端面定位和密封，锁紧螺母与变径螺母组成双螺母互锁，紧定螺钉锁紧后组成防拆卸螺母副，定位密封螺母旋进位置决定调节长度。

Description

说 明 书 长度可调节防拆卸表用管螺纹活接头连接结构 技术领域
本发明涉及一种用于管道连接的管螺纹活接头连接结构。 背景技术
如附图说明中图 1所示， 现有技术的表用活接头是由一个一端带 法兰面的单头管外螺纹件 1， 一个螺帽 2和一个密封垫圈 3组成。 单头 管外螺纹件的螺纹端 11与管路中其它内螺纹元件 （如内螺纹阀门或管 箍） 连接， 另一端为与螺帽头部 21相连的法兰面 12管口结构， 法兰 面管口 13插入表口中起到限制单头管外螺纹件在表口的位置， 螺帽的 内螺纹端 22与表口外螺纹 42连接， 另一端 21与单头管外螺纹件的法 兰面 12相连。 安装时， 通过螺帽内螺纹 22与表口外螺纹 42的不断拧 紧产生机械连接， 同时单头管外螺纹件法兰端面 12压紧密封圈 3到表 口外螺纹端面 41， 达到轴向端面密封效果。 这种表用活接头不足之处 在于， 由于密封是依靠螺帽 2轴向压紧单头管外螺纹件法兰端面 12和 表口外螺纹端面 41之间的密封圈 3而获得的， 无任何可伸缩余量， 否 则密封无法保证。 因而对表具安装的轴向间距要求很高， 允许误差范 围很小， 给安装施工与维护带来很大的不便。 另外， 现有的表接头防 拆卸方法与技术都存在结构复杂、 成本较高以及易被拆卸等缺点， 不 易推广。 发明内容
针对前述问题而提供的长度可调节防拆卸表用管螺纹活接头连接 结构， 其柱 /柱螺纹副配合可调节轴向长度， 并具有很好的连接强度、 密封性能以及防拆卸效果。 针对前述的长度可调节防拆卸表用管螺纹活接头连接结构， 其特 点是， 包括管外螺纹件、 变径螺母、 定位密封螺母、 表口外螺纹、 锁 紧螺母以及紧定螺钉， 管外螺纹件具有圆柱外螺纹， 变径螺母具有第 一圆柱内螺纹和第二圆柱内螺纹， 定位密封螺母通过圆柱外螺纹与变 径螺母在变径处轴孔配合， 同时定位密封螺母与表口外螺纹端面配合， 圆柱外螺纹与第一圆柱内螺纹啮合成起到机械连接作用的第一连接螺 纹副， 表口外螺纹与第二圆柱内螺纹啮合旋紧成起到机械连接作用的 第二连接螺纹副， 与此同时定位密封螺母内螺纹与圆柱外螺纹啮合成 起到密封连接作用的变异密封螺纹副,定位密封螺母与表口外螺纹端面 形成轴向端面定位和端面密封， 锁紧螺母通过圆柱外螺纹啮合至变径 螺母第一内螺纹外端面与变径螺母产生双螺母互锁功能， 在紧定螺钉 作用下组成防拆卸锁紧螺母副， 定位密封螺母在圆柱外螺纹上的旋进 位置决定调节长度。 所述的长度可调节防拆卸表用管螺纹活接头连接结构， 其进一步 的特点是， 管外螺纹件、 变径螺母、 锁紧螺母为管件或者是铸件或者 是锻件。 所述的长度可调节防拆卸表用管螺纹活接头连接结构， 其进一步 的特点是， 管外螺纹件具有圆柱外螺纹， 或者是一端具有与管路元件 相匹配的外螺纹结构， 另一端具有圆柱外螺纹。 所述的长度可调节防拆卸表用管螺纹活接头连接结构， 其进一步 的特点是， 定位密封螺母具有杆部， 其杆部的高度至少大于管外螺纹 件圆柱外螺纹的一个螺距， 变径螺母的变径处具有过渡孔， 该杆部伸 入到过渡孔中， 形成轴孔配合， 所述轴孔配合形式为圆锥面 /圆柱面配 合或者是圆锥面 /圆锥面配合或者是圆柱面 /圆柱面配合， 圆柱面或圆锥 面是光滑平面或者是螺纹或其它机械花纹。 所述的长度可调节防拆卸表用管螺纹活接头连接结构， 其进一步 的特点是， 定位密封螺母具有内螺纹和定位端面， 定位密封螺母旋合 在第一连接螺纹副和表口外螺纹之间的圆柱外螺纹上， 具有调节活接 头长度的作用， 在变径螺母被拧紧至表口外螺纹过程中， 内螺纹与管 外螺纹件的圆柱外螺纹啮合成变形的起到密封连接作用的变异密封螺 纹副， 同时定位端面与表口外螺纹端面形成端面定位密封副。 所述的长度可调节防拆卸表用管螺纹活接头连接结构， 其进一步 的特点是， 定位密封螺母选用硬度较变径螺母和管外螺纹件软的材料 制造。 所述的长度可调节防拆卸表用管螺纹活接头连接结构， 其进一步 的特点是， 圆柱外螺纹为滚压成形的管螺纹。 所述的长度可调节防拆卸表用管螺纹活接头连接结构， 其进一步 的特点是， 变径螺母的第二圆柱内螺纹是与表口外螺纹相匹配的圆柱 内螺纹或者是圆锥内螺纹。 所述的长度可调节防拆卸表用管螺纹活接头连接结构， 其进一步 的特点是， 还包括锁紧螺母和紧定螺钉， 锁紧螺母与变径螺母组成双 螺母互锁， 锁紧螺母的外力面具有与圆柱外螺纹相垂直的内螺纹孔， 内螺纹孔中的紧定螺钉被锁紧后与圆柱外螺纹的牙底机械接触产生旋 合阻力， 锁紧螺母与变径螺母组成防拆卸锁紧螺母副。 针对前述问题， 还提供一种长度可调节防拆卸表用管螺纹活接头 连接结构， 其进一步的特点是， 包括管外螺纹件、 变径螺母、 定位密 封垫圈、 表口外螺纹、 锁紧螺母以及紧定螺钉， 管外螺纹件具有圆柱 外螺纹， 变径螺母具有第一圆柱内螺纹和第二圆柱内螺纹， 定位密封 垫圈与管外螺纹件圆柱外螺纹旋进配合时产生第三圆柱内螺纹， 定位 密封垫圈通过圆柱外螺纹与变径螺母在变径处轴孔配合， 同时定位密 封垫圈与表口外螺纹端面配合， 圆柱外螺纹与第一圆柱内螺纹啮合成 起到机械连接作用的第一连接螺纹副， 表口外螺纹与第二圆柱内螺纹 啮合旋紧成起到机械连接作用的第二连接螺纹副， 与此同时第三圆柱 内螺纹与圆柱外螺纹啮合成起到密封连接作用的变异密封螺纹副,定位 密封垫圈与表口外螺纹端面形成轴向端面定位和端面密封， 锁紧螺母 与圆柱外螺纹啮合至变径螺母第一内螺纹外端面与变径螺母产生双螺 母互锁功能， 在紧定螺钉作用下组成防拆卸锁紧螺母副， 定位密封垫 圈在圆柱外螺纹上的旋进位置决定调节长度， 定位密封垫圈的厚度至 少大于管外螺纹件圆柱外螺纹的一个螺距。 前述的长度可调节防拆卸表用管螺纹活接头连接结构保留了传统 表用活接头管外螺纹件的管外螺纹一端， 保留了与表口外螺纹产生机 械连接的螺帽内螺纹和密封圈端面密封的特点， 有意识地将与管外螺 纹件整体制造的法兰面端口、 螺帽头部和密封垫圈之间的固定紧密密 封配合， 分别改造成管外螺纹件的圆柱外螺纹、 变径螺母第一圆柱内 螺纹和定位密封螺母之间的柱 /柱管螺纹连接的具有长度可以调节的配 合， 将仅仅靠端面密封的密封垫圈改造成既有内螺纹变异密封又有端 面密封， 同时可以起到类似于法兰面端面定位作用的定位密封螺母,这 样组成了长度可以调节的表用管螺纹活接头连接结构。 另外， 通过在 圆柱外螺纹上增加锁紧螺母,利用锁紧螺母内螺纹与变径螺母第一内螺 纹螺旋线起始点不尽相同产生相互锁紧的原理， 达到锁紧变径螺母的 目的。 在锁紧螺母的外力面制造与圆柱外螺纹相垂直的内螺纹孔， 旋 入紧定螺钉至内螺纹孔中与圆柱外螺纹的牙底机械接触产生类似于定 位销作用的旋合阻力， 在锁紧螺母与变径螺母产生双螺母相互锁紧功 能之后， 锁紧螺母本身具有了防拆卸功能， 组成了变径螺母与锁紧螺 母的防拆卸锁紧螺母副。 使定位密封螺母端面定位与端面密封、 内螺纹变异密封以及使锁 紧螺母产生锁紧功能的方法是首先分别依次从管外螺纹件圆柱外螺纹 端旋进锁紧螺母、 变径螺母和定位密封螺母； 其次是外加扭矩旋紧变 径螺母至表口外螺纹， 期间定位密封螺母杆部外圆面和端面分别受到 变径螺母变径处内锥面和表口外螺纹端面的双重挤压产生一定的轴向 分力与径向分力,使定位密封螺母的内螺纹本身与圆柱外螺纹产生相对 的一定的材料变形， 从而使内外螺纹密封配合段的内外螺纹在牙顶、 牙底和牙侧产生至少一道螺纹完全密合， 形成可靠的密封。 由于密封 配合段内螺纹牙型角产生一定的变异， 密封配合段螺纹副具有一定的 自锁功能， 在使用过程中无需任何填料能保证良好的密封性。 为了保 证密封的可靠性与实际使用方便性， 密封配合段的定位密封螺母应选 用硬度较变径螺母和滚压后管外螺纹件软的材料制造， 也可以是金属 复合材料和非金属材料， 如 PE材料。为了保证密封的可靠性,也允许在 第一圆柱内螺纹与定位密封螺母之间添加合适的密封介质， 如密封垫 圈。 在定位密封螺母内螺纹变异密封的过程中， 定位密封螺母端面与 表口外螺纹端面压紧贴合形成端面定位与密封。 定位密封螺母杆部的 高度至少大于管外螺纹件圆柱外螺纹的一个螺距。 变径螺母的变径处 内圆面与定位密封螺母的杆部外圆面可以有多种配合形式如： 圆锥面 / 圆柱面配合或者是圆锥面 /圆锥面配合或者是圆柱面与圆柱面配合， 圆 柱内外表面或圆锥内外表面可以是光滑平面， 也可以是螺纹或其它机 械花纹。 当定位密封螺母采用具有较软材料制造的密封垫圈替代时， 密封垫圈在第一连接螺纹副和表口外螺纹中间的圆柱外螺纹上， 在轴 向力的挤压作用下密封垫圈和管外螺纹件的圆柱外螺纹啮合变形填满 至少一道外螺纹的牙顶、 牙底和牙侧， 从而起到密封作用。 定位密封 垫圈的厚度至少大于管外螺纹件圆柱外螺纹的一个螺距， 但定位效果 不如前述的相同厚度的定位密封螺母。 使锁紧螺母产生锁紧功能的方法是外加扭矩在锁紧螺母外力面， 将锁紧螺母旋紧贴合至变径螺母第一内螺纹的外端面上， 锁紧螺母与 变径螺母贴合组成了具有不同螺纹螺旋线起始点的新的组合螺母， 组 合螺母副具有自锁功能。 在锁紧螺母外力面与圆柱外螺纹相垂直的内 螺纹孔中， 旋入紧定螺钉至内螺纹孔中与圆柱外螺纹的牙底机械接触 产生类似于定位销的旋合阻力， 在锁紧螺母与变径螺母产生双螺母相 互锁紧功能之后， 变径螺母和锁紧螺母的组合螺母副具有了防拆卸锁 紧功能。 与锁紧螺母、 变径螺母和定位密封螺母柱 /柱配合的园柱外螺 纹的长度根据产品需求情况而定， 但最短不得小于变径螺母第一圆柱 内螺纹长度、 定位密封螺母厚度以及锁紧螺母厚度三者之和并且留有 长度调节余量，同时考虑到表口外螺纹的内孔有效调节深度， 管外螺纹 件的光杆部分的长度根据产品需求情况而定。 前述技术方案充分利用柱 /柱管螺纹配合机械连接强度高、 管道连 接长度可以调整等优点， 结合定位密封螺母内螺纹变异密封、 端面密 封和端面定位等技术特性， 产生了允许两个需要连接的管道元件之间 有较大伸缩余量的优势， 方便安装与维护， 同时利用了双螺母相互锁 紧和紧定螺钉定位锁紧等技术特性， 使本技术方案又具有自锁防拆卸 功能； 使用便捷性、 功能性和管网连接安全性大大优于目前表用活接 头， 开拓了表用管螺纹活接头的概念， 拓宽了表用管螺纹活接头连接 的应用范围,市场前景不可估量。 下面将结合附图说明和具体实施方式对本发明的前述目的、 技术 方案和有益效果进行详细的描述。 附图说明
图 1是现有技术表用活接头结构的示意图。
图 2是本发明一实施例的表用管螺纹活接头结构的示意图。
图 3是图 2中管外螺纹件结构的示意图。
图 4是图 2中变径螺母结构的示意图。
图 5是图 2中定位密封螺母结构的示意图。
图 6是图 2表口外螺纹结构的示意图。
图 7是图 2锁紧螺母结构的示意图。
图 8是图 2紧定螺钉结构的示意图。
图 9是图 2中表用管螺纹活接头完成机械连接、 密封和锁紧状态 后结构的示意图。
图 10 是定位密封螺母内螺纹以及定位端面在变径螺母变径处和 表口外螺纹端面的双重轴向挤压下分别与圆柱外螺纹产生螺纹变异密 封和表口外螺纹端面产生端面定位密封前后的对照图。
图 1 1 是锁紧螺母与变径螺母产生双螺母相互锁紧功能前后的对 照图。
图 12是紧定螺钉使锁紧螺母产生防拆卸功能前后的对照图。
图 13是本发明又三项实施例的表用管螺纹活接头结构的示意图。 图 14是本发明又三项实施例的表用管螺纹活接头结构的示意图。 图 15是根据本发明方法的一实施例家用燃气表安装前的示意图。 图 16是图 15管螺纹活接头安装后准备长度调节 5亳米的示意图。 图 17是图 15管螺纹活接头定位密封螺母水平定位后的示意图。 图 18是图 15管螺纹活接头与燃气表安装定位双螺母锁紧后的示 意图。
图 19是图 15管螺纹活接头与燃气表安装定位锁紧防拆卸后的示 意图。 具体实施方式
如图 2所示， 在本发明的一实施例中， 表用管螺纹活接头连接结 构包括管外螺纹件 1、 变径螺母 2、 定位密封螺母 3、 表口外螺纹 4、 锁紧螺母 5以及紧定螺钉 6。 如图 3所示， 管外螺纹件 1的一段为圆锥外螺纹 1 1， 另一端为园 柱外螺纹 13， 中间为不完整管螺纹或者是管体本身 12。 1 1与管路中其 他内螺纹元件 （如内螺纹阀门或管箍） 匹配连接。 如图 4所示，变径螺母 2具有第一圆柱内螺纹 21和第二圆柱内螺 纹 23， 21和 23的变径处 22为圆锥面， 变径螺母的外力面可设计为六 角或者是八角或者是其他形式的外力作用面， 通过扳手等在变径螺母 外侧面施加力矩。 如图 5所示， 定位密封螺母 3具有外锥面 31、 内螺纹 32和定位 平端面 33。 如图 6所示， 表口外螺纹 4具有平端面 41和外螺纹 42。 如图 7所示，锁紧螺母 5具有内螺纹 51和与圆柱外螺纹相垂直的 外力面上的内螺纹孔 52。 如图 8所示， 内角紧定螺钉长度小于锁紧螺母 5的壁厚， 通过特 殊的内五角工扳手工具可以旋进或者是旋出。 如图 2至图 8所示， 管外螺纹件 1的下端为圆柱外螺纹 13， 其相 当于螺杆， 变径螺母 2的第一圆柱内螺纹 21、 定位密封螺母 3的内螺 纹 32和锁紧螺母 5的内螺纹 51是为相同的内螺纹， 或者说都可以与 相同的外螺纹例如圆柱外螺纹 13啮合， 在变径螺母未被拧紧前， 这种 连接仅仅成起到柱 /柱管螺纹连接的作用。 内锥面 22和外锥面 31为一 对配合面， 内锥面 22的最小外径是小于外锥面 31 的最小外径。 因此 当定位密封螺母 3的杆部进入到变径螺母 2的变径处后， 内锥面 22和 外锥面 31会以线接触方式配合， 即内锥面 22的一圈与外锥面 31的末 端边缘接触， 在表口外螺纹端面 41的轴向力作用下， 接触处产生一定 的挤压力， 使内螺纹变异。 如图 2所示， 锁紧螺母 5、 变径螺母 2以及定位密封螺母 3分别 依次旋合在圆柱外螺纹 13上， 定位密封螺母 3的位置决定了长度调节 的距离。 安装时首先将定位密封螺母 3旋合固定在圆柱外螺纹 13所需 要的位置上， 然后将变径螺母第二圆柱内螺纹 23与表口外螺纹 42对 齐上螺纹， 在变径螺母 2 外力面上施加力矩， 使变径螺母第一圆柱内 螺纹 21在圆柱外螺纹 13上移动， 同时使第二圆柱内螺纹 23在表口外 螺纹 42方向锁紧移动。 如图 9所示， 当定位密封螺母 31 的末端接触 到内锥面 22的同时， 定位密封螺母定位平端面 33接触到表口外螺纹 端面 41， 定位密封螺母 3被产生力 F1和 F2, 力 F1分解为轴向分力 Fv和径向分力 FH， 轴向分力 Fv和 F2使定位密封螺母 3的内螺纹 32 本身与管外螺纹件圆柱外螺纹 13产生相对的一定的材料变形，如图 10 所示， 从而使内、 外螺纹在牙顶、 牙底和牙侧产生至少一道螺纹完全 密合， 形成变异密封螺纹副， 获得可靠的柱 /柱管螺纹配合密封,同时使 定位密封螺母端面 33与表口外螺纹端面 41 压紧贴合获得可靠的端面 定位和密封。 这样管外螺纹件圆柱外螺纹 13和表口外螺纹 42分别与 第一圆柱内螺纹 21 和第二圆柱内螺纹 23 啮合形成起到机械连接作用 的圆柱管螺纹连接副， 而圆柱外螺纹 13和定位密封螺母内螺纹 32之 间的啮合形成主要起到柱 /柱管螺纹配合的变异圆柱管螺纹密封副， 同 时定位密封螺母端面 33与表口外螺纹端面 41 压紧贴合形成主要起到 端面配合的具有定位和密封作用的端面定位密封副。 如图 11所示， 锁 紧螺母 5在圆柱外螺纹 13上移动， 当锁紧螺母 5贴合到变径螺母第一 内螺纹 21外端面时， 锁紧螺母 5与变径螺母 2组合成新的具有互锁功 能的螺母副。 如图 12所示， 在锁紧螺母 5外力面与圆柱外螺纹相垂直 的内螺纹孔 52中， 旋入紧定螺钉 6至内螺纹孔 52中与圆柱外螺纹 13 的牙底机械接触产生类似于定位销作用的旋合阻力， 在锁紧螺母 5 与 变径螺母 2产生双螺母相互锁紧功能之后， 在紧定螺钉 6 的作用下锁 紧螺母 5与变径螺母组成了具有锁紧防拆卸功能的螺母副。 为了保证密封的可靠性与实际使用方便性， 密封配合变异圆柱管 螺纹副中的定位密封螺母选用硬度较变径螺母和滚压后管外螺纹件软 的材料制造， 也可以是金属复合材料和非金属材料， 如 PE材料。 为了 保证密封的可靠性,也可以在第一和第二机械连接圆柱管螺纹副之间添 加合适的密封介质， 如密封垫圈。 在图 2所示的实施例中，变径螺母 2的内锥面 22与定位密封螺母
3的杆部外锥面 31的配合还可以有多种替换的配合形式， 如： 圆锥面 / 圆柱面配合或者是圆柱面与圆柱面配合， 圆柱内、 外表面或圆锥内、 外表面可以是光滑平面， 也可以是螺纹或其它机械花纹。 如图 15所示， 有一家用燃气表安装项目， 采用全滚压管螺纹连接 方式。 管道工程中用于连接燃气表进出口的阀门 A和管箍 B已安装到 位， 现需要将燃气表安装连通。 由于阀门 A与管箍 B有长度尺寸差异， 造成高度相差 5 亳米， 无法直接将燃气表安装平整。 目前方法之一是 将管箍 B卸下， 重新加工外螺纹管件 N， 使管箍内螺纹的高度与阀门 A 内螺纹的高度一致， 但实际上加工误差总是存在，造成燃气表进出口 管路不水平安装， 或者是通过减少外螺纹与管路元件内螺纹啮合道数 来调整燃气表水平高度， 产生安全隐患。 图 16表示出了 C和 D二组这 样的长度可调节防拆卸表用管螺纹活接头组件， 其中包括滚压管外螺 纹件 C1和 Dl、 变径螺母 C2和 D2、 定位密封螺母 C3和 D3 , 以及锁 紧螺母 C5和 D5。 如图 16所示， C、 D二组产品中管外螺纹件 1与阀 门 A和管箍 B之间的螺纹啮合为通常的管螺纹旋紧密封连接； 将二组 锁紧螺母 C5和 D5、 变径螺母 C2和 D2, 以及定位密封螺母 C3和 D3 分别与已旋紧安装的管外螺纹件圆柱外螺纹啮合成柱 /柱管螺纹配合的 连接副， 在定位密封螺母 C3、 D3与圆柱外螺纹 Cl、 D1之间未产生内 外螺纹挤压变异时， 各螺纹间的配合为标准的柱 /柱管螺纹配合， 二组 活接头的水平高度调整通过 C3 和 D3 与管外螺纹件圆柱外螺纹的柱 / 柱管螺纹配合加以实现， 图 17所示是二组活接头调整完毕后， 定位密 封螺母 C3和 D3水平高度是一致的。 当变径螺母第二圆柱内螺纹与燃 气表口外螺纹对中后， 分别手旋左右二个变径螺母 C2和 D2, 如图 18 所示， 燃气表的安装水平高度分亳不差， 此时左右二端变径螺母 C2和
D2与表口外螺纹的连接为柱 /柱配合的非密封连接方式。为了达到密封 目的， 机紧变径螺母 C2和 D2, 定位密封螺母 C3和 D3的内螺纹在变 径螺母 C2和 D2被旋进过程中逐渐受到变径螺母内锥面和表口外螺纹 端面双向挤压， 产生 FH和 FV二个分力， 如图 10所示， 内螺纹在旋 进过程中逐步变异并且与滚压圆柱外螺纹的牙顶、 牙面、 牙底渐渐贴 合密实， 达到至少一道螺纹的密封效果； 与此同时， C3和 D3 的定位 端面与表口外螺纹端面挤压贴合产生端面定位和密封效果。 如图 18所 示， 机紧锁紧螺母 C5和 D5使其与变径螺母第一内螺纹外端面贴合形 成双螺母相互锁紧。如图 19所示， 最后将紧定螺钉 C6和 D6拧入锁紧 螺母的内螺纹孔中至圆柱外螺纹牙底产生机械接触定位， 组成锁紧防 拆卸螺母副。 虽然本发明已以较佳实施例揭露如上， 然而其并非用以限定本发 明， 任何熟悉本领域的一般技术人员， 在不脱离本发明的精神和范围 内， 可做出种种等效的变化或替换， 例如， 表口外螺纹可以是圆柱外 螺纹结构， 也可以如图 13所示， 是圆锥外螺纹结构， 变径螺母的第二 圆柱内螺纹是与表口外螺纹相匹配的圆锥内螺纹或者是圆柱内螺纹。 管外螺纹件与管路元件相匹配的螺纹结构是圆锥外螺纹， 也可以如图 14 所示是圆柱外螺纹或者是圆锥内螺纹或者是圆柱内螺纹。 上述各种 外螺纹可以是滚压成形， 也可以是挤压成形或者是切削成形； 变径螺 母的内螺纹是切削成形， 也可以是挤压成形内螺纹。 锁紧螺母是用紧 定螺钉定位或者是防松原理定位或者是锁紧螺母与变径内螺纹之间的 止推垫圈定位， 也可以是其他螺栓与螺母常规定位锁紧方法， 也可以 将紧定螺钉内螺纹孔制造在变径螺母的外力面上， 将紧定螺钉与表口 外螺纹垂直啮合起到锁紧变径螺母防拆卸作用。 前述各实施例的构造还可以彼此进行组合。

Claims

权 利 要 求 书
1. 长度可调节防拆卸表用管螺纹活接头连接结构具有柱 /柱螺纹 副的连接特性， 并且具有密封和防拆卸效果， 其特征在于， 包括管外 螺纹件、 变径螺母、 定位密封螺母、 表口外螺纹、 锁紧螺母以及紧定 螺钉， 管外螺纹件具有圆柱外螺纹， 变径螺母具有第一圆柱内螺纹和 第二圆柱内螺纹， 定位密封螺母通过圆柱外螺纹与变径螺母在变径处 轴孔配合， 同时定位密封螺母与表口外螺纹端面配合， 圆柱外螺纹与 第一圆柱内螺纹啮合成起到机械连接作用的第一连接螺纹副， 表口外 螺纹与第二圆柱内螺纹啮合旋紧成起到机械连接作用的第二连接螺纹 副， 与此同时定位密封螺母内螺纹与圆柱外螺纹啮合成起到密封连接 作用的变异密封螺纹副,定位密封螺母与表口外螺纹端面形成轴向端面 定位和端面密封， 锁紧螺母通过圆柱外螺纹啮合至变径螺母第一内螺 纹外端面与变径螺母产生双螺母互锁功能， 在紧定螺钉作用下组成防 拆卸锁紧螺母副， 定位密封螺母在圆柱外螺纹上的旋进位置决定调节 长度。
2. 如权利要求 1所述的长度可调节防拆卸表用管螺纹活接头连接 结构， 其特征在于， 管外螺纹件、 变径螺母、 锁紧螺母为管件或者是 铸件或者是锻件。
3. 如权利要求 1所述的长度可调节防拆卸表用管螺纹活接头连接 结构， 其特征在于， 管外螺纹件具有圆柱外螺纹,或者是一端具有与管 路元件相匹配的外螺纹结构， 另一端具有圆柱外螺纹。
4. 如权利要求 1所述的长度可调节防拆卸表用管螺纹活接头连接 结构， 其特征在于， 定位密封螺母具有杆部， 其杆部的高度至少大于 管外螺纹件圆柱外螺纹的一个螺距， 变径螺母的变径处具有过渡孔， 该杆部伸入到过渡孔中， 形成轴孔配合， 所述轴孔配合形式为圆锥面 / 圆柱面配合或者是圆锥面 /圆锥面配合或者是圆柱面 /圆柱面配合， 圆柱 面或圆锥面是光滑平面或者是螺纹或其它机械花纹。
5. 如权利要求 1所述的长度可调节防拆卸表用管螺纹活接头连接 结构， 其特征在于， 定位密封螺母具有内螺纹和定位端面， 定位密封 螺母旋合在第一连接螺纹副和表口外螺纹之间的圆柱外螺纹上， 具有 调节活接头长度的作用， 在变径螺母被拧紧至表口外螺纹过程中， 内 螺纹与管外螺纹件的圆柱外螺纹啮合成变形的起到密封连接作用的变 异密封螺纹副， 同时定位端面与表口外螺纹端面形成端面定位密封副。
6. 如权利要求 1所述的长度可调节防拆卸表用管螺纹活接头连接 结构， 其特征在于， 定位密封螺母选用硬度较变径螺母和管外螺纹件 软的材料制造。
7. 如权利要求 1所述的长度可调节防拆卸表用管螺纹活接头连接 结构， 其特征在于， 管外螺纹件的圆柱外螺纹为滚压成形的管螺纹。
8. 如权利要求 1所述的长度可调节防拆卸表用管螺纹活接头连接 结构， 其特征在于， 变径螺母的第二圆柱内螺纹是与表口外螺纹相匹 配的圆柱内螺纹或者是圆锥内螺纹。
9.如权利要求 1 所述的长度可调节防拆卸表用管螺纹活接头连接 结构， 其特征在于， 还包括锁紧螺母和紧定螺钉， 锁紧螺母与变径螺 母组成双螺母互锁， 锁紧螺母的外力面具有与圆柱外螺纹相垂直的内 螺纹孔， 内螺纹孔中的紧定螺钉被锁紧后与圆柱外螺纹的牙底机械接 触产生旋合阻力， 锁紧螺母与变径螺母组成防拆卸锁紧螺母副。
10. 长度可调节防拆卸表用管螺纹活接头连接结构具有柱 /柱螺纹 副的连接特性， 并且具有密封和防拆卸效果， 其特征在于， 包括管外 螺纹件、 变径螺母、 定位密封垫圈、 表口外螺纹、 锁紧螺母以及紧定 螺钉， 管外螺纹件具有圆柱外螺纹， 变径螺母具有第一圆柱内螺纹和 第二圆柱内螺纹， 定位密封垫圈与管外螺纹件圆柱外螺纹旋进配合时 产生第三圆柱内螺纹， 定位密封垫圈通过圆柱外螺纹与变径螺母在变 径处轴孔配合， 同时定位密封垫圈与表口外螺纹端面配合， 圆柱外螺 纹与第一圆柱内螺纹啮合成起到机械连接作用的第一连接螺纹副， 表 口外螺纹与第二圆柱内螺纹啮合旋紧成起到机械连接作用的第二连接 螺纹副， 与此同时第三圆柱内螺纹与圆柱外螺纹啮合成起到密封连接 作用的变异密封螺纹副,定位密封垫圈与表口外螺纹端面形成轴向端面 定位和端面密封， 锁紧螺母与圆柱外螺纹啮合至第一内螺纹外端面与 变径螺母产生双螺母互锁功能， 在紧定螺钉作用下组成防拆卸锁紧螺 母副， 定位密封垫圈在圆柱外螺纹上的旋进位置决定调节长度， 定位 密封垫圈的厚度至少大于管外螺纹件圆柱外螺纹的一个螺距。
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