WO2021046670A1 - 卡压式连接管件、卡压式复合管件及制造方法 - Google Patents

卡压式连接管件、卡压式复合管件及制造方法 Download PDF

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Publication number
WO2021046670A1
WO2021046670A1 PCT/CN2019/104862 CN2019104862W WO2021046670A1 WO 2021046670 A1 WO2021046670 A1 WO 2021046670A1 CN 2019104862 W CN2019104862 W CN 2019104862W WO 2021046670 A1 WO2021046670 A1 WO 2021046670A1
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WO
WIPO (PCT)
Prior art keywords
pipe
compression
pipe fitting
wall
clamping
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PCT/CN2019/104862
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English (en)
French (fr)
Inventor
金淼龙
朱张泉
蒋利荣
柴桥杨
马为民
吴家文
Original Assignee
浙江海亮股份有限公司
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Application filed by 浙江海亮股份有限公司 filed Critical 浙江海亮股份有限公司
Priority to PCT/CN2019/104862 priority Critical patent/WO2021046670A1/zh
Priority to CN201921771628.6U priority patent/CN211623890U/zh
Priority to CN201911003238.9A priority patent/CN110864034A/zh
Publication of WO2021046670A1 publication Critical patent/WO2021046670A1/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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
    • F16B7/04—Clamping or clipping connections
    • F16B7/0406—Clamping or clipping connections for rods or tubes being coaxial
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • 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
    • F16J15/061—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with positioning means
    • 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
    • F16J15/062—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces characterised by the geometry of the seat

Definitions

  • the invention relates to a compression type connecting pipe fitting, a compression type composite pipe fitting and a manufacturing method, and belongs to the field of pipe production.
  • the two metal pipes are connected by a compression connection pipe fitting, and the ends of the two metal pipes are respectively inserted into the middle of the compression connection pipe fitting, and then the pipe and the compression connection are realized by squeezing the compression connection pipe fitting Fixing between pipe fittings.
  • the compression-type connecting pipe In order to be able to achieve the fixation of the pipe and the compression-type connecting pipe, it is necessary to make the compression-type connecting pipe have a thicker thickness, so that the compression-type connecting pipe can form a sufficient holding force with the pipe after deformation. Invisibly increases the production cost of the press-fit connection pipe fittings.
  • the technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a compression connecting pipe fitting, a compression composite pipe fitting and a manufacturing method with lower production cost.
  • the present invention adopts the following technical solutions:
  • a compression-type connection pipe fitting comprising: a pipe fitting body for compression connection with a metal pipe; and, an annular sealing groove provided on the inner wall of the pipe fitting body, the annular sealing groove being used for installing a sealing ring; and, A compression rib formed by the protrusion of the pipe body material, the compression rib forms a compression groove on the inner wall of the pipe body, and the compression groove provides a compression connection between the compression connection pipe fitting and the metal pipe Material fitting space.
  • the sealing ring is installed in the annular sealing groove, and at the same time, relying on the restriction of the metal pipe, the sealing ring fills and seals the annular sealing groove.
  • the existing standard conventional round pipe is used as the metal pipe, and the end of the metal pipe is installed inside the pipe fitting body, so that the outer wall of the metal pipe is aligned with the clamping groove in the radial direction, and the clamping rib is pressed from the outside to the inside, and the outer wall of the metal pipe is automatically Deformed into the clamping groove to form a clamping block, through the cooperation of the clamping groove and the clamping block, the holding force between the pipe fitting body and the metal pipe is increased, and the anti-pull performance of the pipe fitting body is enhanced, thereby reducing the pressing of the pipe fitting body
  • the wall thickness of the pipe fitting body can also be reduced to a certain extent, which reduces the demand for the wall thickness of the pipe fitting body and reduces the production cost of the press-fit connection pipe fitting.
  • the pressing pressure of the pipe fitting body is correspondingly reduced.
  • the pipe fitting body and metal pipe after production can also meet actual needs.
  • the pipe fitting body and the metal pipe can be connected on-site only with simple tools, and the metal pipe does not need to be processed in advance, so the assembly process is simple and the assembly cost is lower.
  • the number of the clamping ribs of the present invention is at least two, and the clamping ribs are distributed on both sides of the annular sealing groove located in the axial direction of the pipe body.
  • the wall thickness of the pipe fitting body of the present invention is 0.6-1.8mm.
  • the inner wall of the pipe fitting body of the present invention is provided with a limiting step for limiting the end of the metal pipe.
  • a compression type composite pipe fitting includes a sealing ring, a compression connection pipe fitting and a metal pipe sleeved in the middle of the compression connection pipe fitting.
  • the outer wall of the metal pipe presses the sealing ring in the annular sealing groove, and the sealing ring seals the annular seal Groove, the outer wall of the metal pipe protrudes to form a clamping block, and the clamping block is clamped in the clamping groove.
  • Step 1 Squeeze the inner wall of the pipe fitting body, so that the compression ribs formed by the outer protrusion of the pipe fitting body material, and at the same time, the compression ribs form a compression groove on the inner wall of the pipe fitting body, and the sealing ring is locked into the annular sealing groove , And then insert the round tubular metal pipe into the middle of the pipe fitting body until the outer wall of the pipe fitting body moves to the annular sealing groove and the clamping groove;
  • Step 2 Simultaneously squeeze the outer wall of the pipe fitting body at the annular sealing groove and the clamping rib from the outside of the pipe fitting body, so as to deform the sealing ring and seal the annular sealing groove, and at the same time deform the outer wall of the metal pipe at the clamping groove to form a clamping block Then it snaps into the clamping groove.
  • step 1 of the present invention the shape of the clamping rib is annular, and after step 2 is completed, the outer contour of the clamping rib is polygonal.
  • the height of the compression ribs protruding outward from the outer wall of the pipe fitting body is not less than 0.2 mm.
  • step 2 of the present invention the pressure of the clamping rib is 10-30 MPa.
  • Fig. 1 is a schematic diagram of a cross-sectional structure of a compression-type connecting pipe (straight pipe) in an embodiment of the invention
  • FIG. 2 is a schematic diagram of a cross-sectional structure of a compression-type connecting pipe (elbow) in an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a cross-sectional structure of a compression-type connecting pipe fitting (a special-shaped pipe) in an embodiment of the present invention
  • FIG. 4 is a schematic cross-sectional structure diagram of the compression-type composite pipe before compression in the embodiment of the present invention
  • FIG. 5 is a schematic diagram of the three-dimensional structure of the compression-type composite pipe before compression in the embodiment of the present invention.
  • FIG. 6 is a schematic diagram of the cross-sectional structure of the compression-type composite pipe after compression in the embodiment of the present invention.
  • Fig. 7 is a schematic diagram of an enlarged structure at A in Fig. 6;
  • FIG. 8 is a schematic diagram of the three-dimensional structure of the compression-type composite pipe after compression in the embodiment of the present invention.
  • Figure 9 is a schematic diagram of a three-dimensional structure of a mold for clamping a clamping composite pipe in an embodiment of the present invention.
  • this embodiment provides a compression-type composite pipe fitting, including a sealing ring 1, a compression-type connecting pipe fitting, and a metal pipe 3 in the middle of the compression-type connecting pipe fitting.
  • the compression-type connecting pipe fitting includes a pipe fitting body 2, an annular sealing groove 5 provided on the inner wall of the pipe fitting body 2, and a compression rib 7 formed by the protrusion of the pipe fitting body 2 material.
  • the compression rib 7 forms a clip on the inner wall of the pipe fitting body 2. ⁇ 8 ⁇ Pressure groove 8.
  • the outer wall of the pipe fitting body 2 protrudes at the annular sealing groove 5, so that the pipe fitting body 2 partially forms a sealing rib 6 at the annular sealing groove 5.
  • the clamping groove 8 provides a material fitting space for the clamping connection of the clamping connection pipe fitting and the metal pipe 3.
  • the pipe fitting body 2 can be a straight pipe, a bent pipe, a three-way pipe, or other pipe fittings of any shape.
  • the metal pipe 3 extends from one end of the pipe fitting body 2 into the pipe fitting body 2 and then squeezes the outer wall of the pipe fitting body 2 to realize the fixation between the pipe fitting body 2 and the metal pipe 3.
  • a limit step 4 is provided at the midpoint of the inner wall of the pipe fitting body 2, a metal pipe 3 is inserted into the left and right ends of the pipe fitting body 2, and the end of the metal pipe 3 and the limit step 4 Impact to limit the position of the end of the metal pipe 3 inside the pipe body 2.
  • the left half and the right half of the pipe body 2 are symmetrical with the limiting step 4 as the center.
  • the right half of the pipe body 2 is used for description.
  • a total of two clamping ribs 7 are provided on the right half of the pipe body 2. In the axial direction of the pipe body 2, the two clamping ribs 7 are respectively located on both sides of the annular sealing groove 5. The more the clamping ribs 7 are, the higher the connection strength between the pipe fitting body 2 and the metal pipe 3 is. In other embodiments, the number of clamping ribs 7 may also be only one.
  • the inner wall of the pipe fitting body 2 in the prior art can be punched so that the side walls of the pipe fitting body 2 simultaneously form the clamping ribs. 7 and the clamping groove 8 so that the wall thickness of the clamping rib 7 is the same as or similar to the wall thickness of other parts of the pipe fitting body 2.
  • the stamping process transfers pressure to the inner wall of the pipe fitting body 2 through oil, water or other media, and the inner wall of the pipe fitting body 2 receives a relatively uniform force in the circumferential direction of the pipe fitting body 2, so the formed clamping rib 7 is annular in shape.
  • the clamping ribs 7 can also be arranged in other shapes.
  • the metal pipe 3 in this embodiment is a standard round pipe, and no additional processing is required, which reduces the production cost of the pipe connection structure.
  • the sealing ring 1 is clamped into the annular sealing groove 5 on the right half of the pipe fitting body 2, and then the left end of the metal pipe 3 is removed from the pipe fitting body.
  • the right end of 2 moves into the pipe fitting body 2, and the left end of the metal pipe 3 passes through the clamping groove 8, the annular sealing groove 5 and the clamping groove 8 in sequence, and is finally squeezed on the limit step 4.
  • the outer wall of the metal pipe 3 seals the annular sealing groove 5 and the clamping groove 8 at the same time, and the sealing ring 1 is clamped in the annular sealing groove 5 by the outer wall of the metal pipe 3. in.
  • the fixing between the pipe fitting body 2 and the metal pipe 3 needs to be realized by clamping the pipe fitting body 2.
  • the clamping and pressing opening positions of the clamping tool are the convex rib clamping and pressing opening 10, the sealing ring clamping and pressing opening 9 and the convex rib clamping and pressing opening 10 in sequence along a straight line.
  • the edge contour shape of the rib clamping and pressing port 10 is hexagonal, and the edge contour shape of the sealing ring clamping and pressing port 9 is circular.
  • the sealing rib 6 is gradually deformed under the condition of being squeezed by the sealing ring clamping port 9, and the sealing ring 1 in the annular sealing groove 5 is deformed at the same time until the entire annular sealing groove 5 is filled to achieve the sealing effect.
  • the metal pipe 3 will be gradually deformed, thereby clamping and fixing the pipe body 2 and the metal pipe 3.
  • the clamping rib 7 is gradually deformed in the clamping groove 8 during the deformation process, and the inner wall of the pipe fitting body 2 acts on the outer wall of the metal pipe 3, and the outer wall of the metal pipe 3 at the clamping groove 8 gradually bulges to form a smaller clamping block 11.
  • the clamping block 11 is gradually clamped into the clamping groove 8.
  • the cooperation of the clamping block 11 and the clamping groove 8 greatly increases the connection strength between the pipe fitting body 2 and the metal pipe 3, and strengthens the pull-out resistance between the metal pipe 3 and the pipe fitting body 2.
  • the wall thickness of the corresponding pipe fitting body 2 before clamping can also be reduced correspondingly, and the pressure applied during the clamping of the pipe fitting body 2 can also be reduced. reduce. Since the clamping block 11 and the clamping groove 8 cooperate to improve the pull-out resistance, the wall thickness of the corresponding pipe fitting body 2 before clamping can also be reduced correspondingly, and the pressure applied during the clamping of the pipe fitting body 2 can also be reduced. reduce.
  • the wall thickness of the pipe fitting body 2 needs to be set at about 1.3 mm, and in this embodiment, the wall thickness of the pipe fitting body 2 before being clamped only needs to be 0.8 mm.
  • the molding pressure of the pipe fitting body 2 of the three-way pipe fitting blank with an inner diameter of 16mm needs about 80Mpa. In this embodiment, due to the thinning of the pipe fitting body 2, the pressure applied to the pipe fitting body 2 only needs 20Mpa, which is extremely Greatly reduce the requirements for compression equipment.
  • the unit weight of the pipe fitting body 2 of the same specification with an inner diameter of 16 mm is reduced by about 32%, which reduces the production cost of the pipe fitting body 2.
  • the pipe fitting body 2 with a small elbow with an inner diameter of 25 mm or less can be produced using coiled tubing, and the yield rate is increased by more than 10%.
  • part of the annealing process can be omitted, the production bumps can be reduced, and the finished product can be easily cleaned.
  • the outer diameter of the end of the pipe fitting body 2 before being squeezed in this embodiment is 18.9 mm
  • the clamping rib 7 The outer diameter of is set at 19.5 mm, so that the difference between the outer diameter of the clamping rib 7 and the outer diameter of the end of the pipe body 2 is 0.6 mm.
  • the actual production requirement can be met when the difference between the outer diameter of the clamping rib 7 and the outer diameter of the end of the pipe fitting body 2 is not less than 0.2 mm.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Geometry (AREA)
  • Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

一种卡压式连接管件、卡压式复合管件及制造方法，包括：管件本体（2）；以及，设于所述管件本体内壁上的环形密封槽（5），所述环形密封槽用于安装密封圈（1）；以及，由所述管件本体材料外凸形成的卡压筋（7），所述卡压筋在所述管件本体内壁上形成卡压槽（8），所述卡压槽为所述卡压式连接管件和金属管材（3）的卡压连接提供材料嵌合空间。降低了对管件本体壁厚的需求，降低了卡压式连接管件的生产成本，管件本体的按压压力也相应有所减小，此外生产完成后的管件本体和金属管材也能够满足实际使用需求，管件本体和金属管材可以仅依靠简单的工具进行现场连接，不需要事先对金属管材进行加工，因此装配工艺简单，装配成本更低。

Description

卡压式连接管件、卡压式复合管件及制造方法 【技术领域】
本发明涉及一种卡压式连接管件、卡压式复合管件及制造方法，属于管材生产领域。
【背景技术】
两个金属管材之间通过卡压式连接管件进行连接，其中两个金属管材的端部分别插入至卡压式连接管件的中间，然后通过挤压卡压式连接管件实现管材和卡压式连接管件之间的固定。为了能够实现管材和卡压式连接管件之前的固定，就必须使得卡压式连接管件具有较厚的厚度，使得卡压式连接管件形变之后能够与管材之间形成充分的抱紧力，这就无形增加了卡压式连接管件的生产成本。
【发明内容】
本发明所要解决的技术问题在于克服现有技术的不足而提供一种生产成本更低的卡压式连接管件、卡压式复合管件及制造方法。
解决上述技术问题，本发明采用如下技术方案：
一种卡压式连接管件，包括：用于与金属管材卡压连接的管件本体；以及，设于所述管件本体内壁上的环形密封槽，所述环形密封槽用于安装密封圈；以及，由所述管件本体材料外凸形成的卡压筋，所述卡压筋在所述管件本体内壁上形成卡压槽，所述卡压槽为卡压式连接管件和金属管材的卡压连接提供材料嵌合空间。
本发明的有益效果为：
密封圈安装至环形密封槽内，同时依靠金属管材的限制，使得密封圈对环形密封槽进行填充密封。首先采用现有标准的常规圆管作为金属管材，将金属管材的端部安装至管件本体内部，使得金属管材外壁在径向上对准卡压槽，从外向内按压卡压筋，金属管材外壁自动向卡压槽内形变形成卡块，通过卡压槽和卡块的配合增加了管件本体和金属管材之间的抱紧力，增强了管件本体的抗拉拔性能，从而降低了管件本体的按压需求，同时管件本体的壁厚也可以进行一定程度的减薄，降低了对管件本体壁厚的需求，降低了卡压式连接管件的生产成本。管件本体的按压压力也相应有所减小。此外生产完成后的管件本体和 金属管材也能够满足实际使用需求。管件本体和金属管材可以仅依靠简单的工具进行现场连接，不需要事先对金属管材进行加工，因此装配工艺简单，装配成本更低。
本发明所述卡压筋数量至少为两个，卡压筋分布在环形密封槽位于管件本体轴向上的两侧。
本发明所述管件本体的壁厚为0.6-1.8mm。
本发明所述管件本体的内壁设置有对金属管材端部进行限位的限位台阶。
本发明所述卡压筋与管件本体的端部之间留有间距。
一种卡压式复合管件，包括密封圈、卡压式连接管件以及套在卡压式连接管件中间的金属管材，金属管材的外壁将密封圈压紧在环形密封槽内，密封圈密封环形密封槽，金属管材的外壁外凸形成卡块，卡块卡在卡压槽中。
一种卡压式复合管件的制造方法，其特征在于：包括如下步骤：
步骤①：对管件本体的内壁进行挤压，从而使管件本体材料外凸形成的卡压筋，同时卡压筋在所述管件本体内壁上形成卡压槽，将密封圈卡入环形密封槽中，然后将圆管状的金属管材插入至管件本体的中间，直至管件本体的外壁移动至环形密封槽和卡压槽处；
步骤②：从管件本体外侧同时挤压管件本体位于环形密封槽处的外壁以及卡压筋，以使得密封圈形变进而密封环形密封槽，同时使得金属管材在卡压槽处的外壁形变形成卡块进而卡入卡压槽中。
本发明步骤①中，卡压筋的形状为圆环状，步骤②完成后，卡压筋的外轮廓为多边形。
本发明步骤①中，卡压筋从管件本体外壁向外凸出的高度不小于0.2mm。
本发明步骤②中，卡压筋所受压强为10-30MPa。
本发明的其他特点和优点将会在下面的具体实施方式、附图中详细的揭露。
【附图说明】
下面结合附图对本发明做进一步的说明：
图1为本发明实施例中卡压式连接管件(直管)剖面结构示意图；
图2为本发明实施例中卡压式连接管件(弯管)剖面结构示意图；
图3为本发明实施例中卡压式连接管件(异形管)剖面结构示意图；
图4为本发明实施例中卡压式复合管件在卡压前的剖面结构示意图；
图5为本发明实施例中卡压式复合管件在卡压前的立体结构示意图；
图6为本发明实施例中卡压式复合管件在卡压后的剖面结构示意图；
图7为图6中A处放大结构示意图；
图8为本发明实施例中卡压式复合管件在卡压后的立体结构示意图；
图9为本发明实施例中对卡压式复合管件进行卡压的模具立体结构示意图；。
【具体实施方式】
下面结合本发明实施例的附图对本发明实施例的技术方案进行解释和说明，但下述实施例仅为本发明的优选实施例，并非全部。基于实施方式中的实施例，本领域技术人员在没有做出创造性劳动的前提下所获得其他实施例，都属于本发明的保护范围。
在下文描述中，出现诸如术语“内”、“外”、“上”、“下”、“左”、“右”等指示方位或者位置关系仅是为了方便描述实施例和简化描述，而不是指示或暗示所指的装置或者元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
实施例：
参见图1-9，本实施例提供的是一种卡压式复合管件，包括密封圈1、卡压式连接管件以及卡压式连接管件中间的金属管材3。
卡压式连接管件包括管件本体2、设于管件本体2内壁上的环形密封槽5，和由管件本体2材料外凸形成的卡压筋7，卡压筋7在管件本体2内壁上形成卡压槽8。此外管件本体2外壁在环形密封槽5处外凸，使得管件本体2在环形密封槽5处部分形成密封凸筋6。卡压槽8为卡压式连接管件和金属管材3的卡压连接提供材料嵌合空间。
管件本体2可以为直管、弯管、三通管、或者其他任意形状的管件。金属管材3从管件本体2的其中一端伸入管件本体2内，然后挤压管件本体2外壁，实现管件本体2和金属管材3之间的固定。
以直管状的管件本体2为例，管件本体2内壁的中点位置设置有限位台阶4， 管件本体2的左端和右端各插入一根金属管材3，金属管材3的端部与限位台阶4撞击，以限制金属管材3端部在管件本体2内部的位置。
管件本体2的左半部分和右半部分以限位台阶4为中心对称。本实施例以管件本体2的右半部分进行说明。
其中管件本体2的右半部分上共设置有两个卡压筋7，在管件本体2轴向上，两个卡压筋7分别位于环形密封槽5的两侧。卡压筋7数量越多，管件本体2与金属管材3的连接强度越高。在其他实施例中，卡压筋7的数量也可以只有一个。
本实施例中管件本体2与现有技术中的管件本体2区别在于卡压筋7，可以通过对现有技术中的管件本体2内壁进行冲压，从而使管件本体2侧壁同时形成卡压筋7和卡压槽8，以使得卡压筋7壁厚和管件本体2其他部分壁厚相同或者相近。冲压过程是通过油、水或者其他介质对管件本体2内壁传递压力，管件本体2内壁在自身周向上受力较为均匀，因此形成的卡压筋7形状为圆环状。当然在其他实施例中若采用其他方式制作卡压筋7，卡压筋7也可以设置成其他形状。
其中位于右侧的卡压筋7和管件本体2的右端之间留有间距，以增强管件本体2的强度。
此外本实施例中的金属管材3为标准的圆管，不需要额外进行加工，降低管材连接结构的生产成本。
管件本体2右半部分上的卡压筋7和卡压槽8制作完成后，首先将密封圈1卡入管件本体2右半部分的环形密封槽5中，然后金属管材3的左端由管件本体2的右端移向管件本体2内，金属管材3的左端依次经过卡压槽8、环形密封槽5和卡压槽8，最终挤压在限位台阶4上。其中金属管材3的左端挤压至限位台阶4后，金属管材3的外壁将环形密封槽5以及卡压槽8同时封闭，密封圈1则通过金属管材3的外壁卡紧在环形密封槽5中。
管件本体2和金属管材3之间的固定需要通过对管件本体2进行卡压实现。为此需要使用一种卡压工具，该卡压工具的卡压口位置沿一直线依次为凸筋卡压口10、密封圈卡压口9和凸筋卡压口10。凸筋卡压口10的边缘轮廓形状为六角形，密封圈卡压口9的边缘轮廓形状为圆形。
金属管材3插入管件本体2右半部分内后，将管件本体2右半部分上两个圆 环状的卡压筋7分别对准两个凸筋卡压口10，密封圈卡压口9对准密封凸筋6。然后卡压工具进行合模，以使得凸筋卡压口10对卡压筋7进行挤压，同时密封圈卡压口9对密封凸筋6进行挤压，最终使得卡压筋7的形状匹配于凸筋卡压口10，密封凸筋6的形状匹配于密封圈卡压口9。凸筋卡压口10和密封圈卡压口9同时卡压的方式，避免了卡压筋7和密封凸筋6先后受到挤压的情况下在后受压的部分对在先受压部分卡压后的结构产生不必要的影响。
密封凸筋6在受到密封圈卡压口9挤压的情况下逐渐形变，环形密封槽5内的密封圈1一并产生形变，直至将整个环形密封槽5填充满，达到密封的效果。而卡压筋7在逐渐形变的过程中，会使得金属管材3一并逐渐形变，从而对管件本体2和金属管材3进行卡压固定。卡压筋7在形变过程中卡压槽8逐渐形变，同时管件本体2的内壁作用在金属管材3的外壁上，金属管材3在卡压槽8处的外壁逐渐隆起形成一个较小的卡块11，该卡块11逐渐卡入卡压槽8。卡块11和卡压槽8配合极大增加了管件本体2和金属管材3之间的连接强度，强化了金属管材3和管件本体2之间的抗拉拔性能。卡压筋7在受到凸筋卡压口10卡压前后产生的形变越大，相应产生的卡块11体积越大，卡压后的管件本体2和金属管材3之间的抗拉拔性能提升效果越好。
由于卡块11和卡压槽8配合提升了抗拉拔性能，相应管件本体2在卡压前的壁厚也能得到相应的降低，同时对管件本体2卡压时施加的压力也能够有所降低。由于卡块11和卡压槽8配合提升了抗拉拔性能，相应管件本体2在卡压前的壁厚也能得到相应的降低，同时对管件本体2卡压时施加的压力也能够有所降低。以内径为16mm的管件本体2为例，现有技术中在没有设置卡压筋7和卡压槽8的情况下，为了使管件本体2和金属管材3之间达到足够的抗拉拔系数，管件本体2的壁厚需要设置在1.3mm左右，而在本实施例中，管件本体2在卡压之前的壁厚仅需要在0.8mm。对内径为16mm的三通类管件毛坯的管件本体2成型压力需要80Mpa左右，而在本实施例中，由于管件本体2的薄壁化，对管件本体2施加的压力仅需要20Mpa即可，极大降低卡压设备要求。由于管件本体2的薄壁化，内径为16mm的同一规格管件本体2单重下降32％左右，降低了管件本体2的生产成本。由于管件本体2的薄壁化，内径25mm以下小弯头的管件本体2可以使用盘管生产，成材率提升10％以上。此外可以省去部分退火工序，减少生产磕碰伤，便于成品清洗。
对应不同内径的管件本体2，卡块11和卡压槽8配合情况下管件本体2壁厚数据以及相对现有技术管件本体2同样内径情况下的壁厚减薄效果如表1所 示。
表1
Figure PCTCN2019104862-appb-000001
Figure PCTCN2019104862-appb-000002
此外为了保证卡压筋7的形变量，以保证管件本体2和金属管材3之间的连接强度，本实施中管件本体2在受到挤压之前其端部外径为18.9mm，卡压筋7的外径设置在19.5mm，以使得卡压筋7外径和管件本体2端部外径的差值为0.6mm。一般而言，卡压筋7外径和管件本体2端部外径的差值不小于0.2mm的情况下便能满足实际生产需求。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，熟悉该本领域的技术人员应该明白本发明包括但不限于附图和上面具体实施方式中描述的内容。任何不偏离本发明的功能和结构原理的修改都将包括在权利要求书的范围中。

Claims (9)

  1. 一种卡压式连接管件，其特征在于：包括：
    用于与金属管材卡压连接的管件本体；以及，
    设于所述管件本体内壁上的环形密封槽，所述环形密封槽用于安装密封圈；以及，
    由所述管件本体材料外凸形成的卡压筋，所述卡压筋在所述管件本体内壁上形成卡压槽，所述卡压槽为卡压式连接管件和金属管材的卡压连接提供材料嵌合空间。
  2. 根据权利要求1所述的卡压式连接管件，其特征在于：所述卡压筋数量至少为两个，卡压筋分布在环形密封槽位于管件本体轴向上的两侧。
  3. 根据权利要求1所述的卡压式连接管件，其特征在于：所述管件本体的壁厚为0.6-1.8mm。
  4. 根据权利要求1所述的卡压式连接管件，其特征在于：所述管件本体的内壁设置有对金属管材端部进行限位的限位台阶。
  5. 根据权利要求1所述的卡压式连接管件，其特征在于：所述卡压筋与管件本体的端部之间留有间距。
  6. 一种卡压式复合管件，其特征在于：包括密封圈、如权利要求1-5任一权利要求所述的卡压式连接管件以及套在卡压式连接管件中间的金属管材，金属管材的外壁将密封圈压紧在环形密封槽内，密封圈密封环形密封槽，金属管材的外壁外凸形成卡块，卡块卡在卡压槽中。
  7. 一种如权利要求6所述的卡压式复合管件的制造方法，其特征在于：包括如下步骤：
    步骤①：对管件本体的内壁进行挤压，从而使管件本体材料外凸形成的卡压筋，同时卡压筋在所述管件本体内壁上形成卡压槽，将密封圈卡入环形密封槽中， 然后将圆管状的金属管材插入至管件本体的中间，直至管件本体的外壁移动至环形密封槽和卡压槽处；
    步骤②：从管件本体外侧同时挤压管件本体位于环形密封槽处的外壁以及卡压筋，以使得密封圈形变进而密封环形密封槽，同时使得金属管材在卡压槽处的外壁形变形成卡块进而卡入卡压槽中。
  8. 根据权利要求7所述的卡压式复合管件的制造方法，其特征在于：步骤①中，卡压筋的形状为圆环状，步骤②完成后，卡压筋的外轮廓为多边形。
  9. 根据权利要求8所述的卡压式复合管件的制造方法，其特征在于：步骤①中，卡压筋从管件本体外壁向外凸出的高度不小于0.2mm。
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