A gas line quick connector

Abstract

The utility model discloses a kind of gas pipeline quick plug connectors, it belongs to gas pipeline connection technical field, including end sealing assembly, inner sealing ring, outer sealing ring, locking ring and joint seat;Joint seat is equipped with connecting hole, connecting hole includes the inner taper hole, pipe through-hole, first sealing hole and second sealing hole communicated in turn, outer sealing ring groove is equipped on the outside wall of joint seat;Inner sealing ring is arranged in first sealing hole;End sealing assembly is located in second sealing hole;Outer sealing ring is located in outer sealing ring groove;The ring body of locking ring is C-shaped, its axial cooperation end is inserted into inner taper hole, this end compaction driving surface is taper face, compaction driving surface is the taper face same as the hole wall of inner taper hole Inclination tendency;Ring body has the thinning portion of axial extension, the ring body of the circumferential two sides of thinning portion constitutes two clamping parts, and the wall thickness of thinning portion is less than the wall thickness of clamping part;Dustproof, sealing and reliable effect of shell connection of connecting pipe are realized.

Description

Technical Field

[0001] This utility model relates to the field of gas pipeline connection technology, specifically to a quick-connect gas pipeline connector. Background Technology

[0002] In the modern automotive industry, air suspension systems have seen continuous development due to their superior performance advantages, such as significantly improved ride comfort, excellent handling stability, and high adjustability. As a crucial component connecting various gas systems, the quick-connect fittings in air suspension systems have become a subject of research, particularly regarding their reliability and durability.

[0003] Traditional quick-connect couplings have revealed some problems in application, among which the sealing failure problem seriously restricts the performance improvement and efficient operation of air suspension systems. Against this technical background, the need for a safe and reliable quick-connect coupling is becoming increasingly urgent. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a quick-connect gas pipeline connector, which can avoid failure under high pressure when the quick-connect plug is connected to the client, and improve the risk of impurities generated by friction between the locking ring and the connecting pipe.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides a quick-connect fitting for gas pipelines, including an end sealing assembly, an inner sealing ring, an outer sealing ring, a locking ring, and a fitting seat;

[0007] The connector seat is provided with a connecting hole, which includes an inner conical hole, a through hole, a first sealing hole, and a second sealing hole that are connected in sequence. The large end of the inner conical hole is opened on the end face of the first end of the connector seat, and the second sealing hole is opened on the end face of the second end of the connector seat. An outer sealing ring groove is provided on the outer side wall of the connector seat.

[0008] The inner sealing ring is disposed in the first sealing hole; the end sealing assembly is located in the second sealing hole; the outer sealing ring is located in the outer sealing ring groove;

[0009] The locking ring has a C-shaped body, and the axial mating end of the ring body can extend into the inner conical hole. The outer surface of this end is a pressing drive surface, which is a conical surface with the same inclination trend as the hole wall of the inner conical hole. The ring body has an axially extending thinned portion, and the ring body on both sides of the thinned portion forms two clamping portions. The wall thickness of the thinned portion is less than the wall thickness of the clamping portion.

[0010] In the above-mentioned quick-connect gas pipeline connector, the inner diameter of the first sealing hole is smaller than the inner diameter of the second sealing hole; the second end face of the connector seat is provided with a limiting part, which extends radially upward toward the inner side of the second sealing hole; the end sealing assembly includes an inner ring and an inner ring sleeve, the inner ring sleeve is located in the second sealing hole, one end of the inner ring sleeve abuts against the bottom wall of the second sealing hole, and the other end is limited by the limiting part; the inner side of the inner ring sleeve is provided with a sealing groove, and the inner ring is located in the sealing groove.

[0011] In the above-mentioned quick-connect gas pipeline, a positioning support rod is also included. The positioning support rod includes an operating part, a sealing ring limiting part and a locking ring limiting part connected in sequence. The locking ring limiting part includes a plurality of claws spaced apart in the circumferential direction. Two limiting protrusions are spaced apart on the outer wall of the claws.

[0012] In use, the positioning support rod is inserted into the connecting hole, the operating part is located on the outside of the second end of the connector seat, the sealing ring limiting part limits the end sealing assembly and the inner sealing ring, the locking ring is sleeved on the outside of the locking ring limiting part and is located between the two limiting protrusions, and the operating part covers the opening of the second sealing hole on the second end face of the connector seat.

[0013] In the above-mentioned quick-connect gas pipeline connector, the cone angle θ of the inner conical hole is equal to the cone angle α of the clamping drive surface;

[0014] And / or, the cone angle θ of the inner cone hole and the cone angle α of the clamping drive surface are in the range of 30°±5°;

[0015] And / or, the operating end of the ring extends outward from the inner conical hole.

[0016] In the aforementioned quick-connect gas pipeline connector, a flange is provided on the outer side of the connector seat, and the flange is located on the side of the outer sealing ring groove opposite to the first end of the connector seat.

[0017] In the aforementioned quick-connect fitting for gas pipelines, the first end of the fitting seat is machined with external threads, and the second end of the fitting seat is a prism.

[0018] In the above-mentioned quick-connect gas pipeline connector, the flange is circular, and its diameter is 2-4 mm larger than the diameter of the circumcircle of the prism;

[0019] And / or, the cross-section of the prism is a regular hexagon.

[0020] In the above-mentioned quick-connect gas pipeline connector, the inner side of the ring body is provided with retaining teeth, which extend and are distributed throughout the entire circumference of the ring body.

[0021] In the above-mentioned quick-connect gas pipeline connector, the locking teeth have a contact surface, which is a cylindrical surface and coaxial with the connection hole; the two sides of the contact surface are respectively connected to the inner surface of the ring body through a first end face and a second end face; the first end face faces the operating end of the ring body, and the second end face is a conical surface facing the mating end of the ring body.

[0022] In the above-mentioned quick-connect gas pipeline connector, the included angle β between the first end face and the abutment surface is 90°-95°;

[0023] And / or, the width of the contact surface is 0.05-0.3 mm;

[0024] And / or, the number of the locking teeth is two;

[0025] And / or, the diameter of the contact surface is 0.3-0.5 mm smaller than the inner diameter of the through hole.

[0026] The beneficial effects of this utility model are as follows:

[0027] The quick-connect fitting for gas pipelines utilizes an integrated assembly consisting of an end sealing component, an inner sealing ring, an outer sealing ring, a locking ring, and a fitting seat to achieve dustproof, sealing, and reliable fixing of the connecting pipe, ensuring the sealing and stability of the connecting pipe and the housing.

[0028] The middle part of the locking ring is the connecting part, and the two sides of the connecting part are the clamping parts. Since the wall thickness of the connecting part is less than the wall thickness of the clamping part, the elastic deformation of the clamping part is increased, which not only increases the connection strength with the connecting pipe, but also makes it easier to disassemble the locking ring, thereby disassembling the connecting pipe.

[0029] The flange of the connector increases the contact area between the outer sealing ring and the connector when connected to the port of the housing, avoiding the design risk of the outer sealing ring being squeezed out from the outer side of the prism. Similarly, the flange of the connector can play a mechanical sealing role, improving the shock resistance of the product.

[0030] The cone angle of the inner conical hole is equal to the cone angle of the clamping drive surface. The same taper fit gives it a self-locking characteristic. The locking ring has good clamping characteristics, keeping the locking ring and the connecting pipe tight.

[0031] The locking ring has a contact surface with cylindrical surface and a width of 0.05-0.3mm. The contact surface with the connecting pipe is large, which avoids the risk of air leakage caused by impurities due to relative movement between the locking ring and the connecting pipe during transportation after assembly. It also avoids excessive damage caused by the sharp corner of the locking ring mating with the connecting pipe after the connecting pipe is engaged.

[0032] The positioning support rod can combine the end sealing assembly, inner sealing ring, locking ring sleeve and connector seat into a whole, which is convenient for storage, transfer and use; the operating part can cover the connection hole of the connector seat to avoid damage to the end sealing assembly during transfer and storage. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the quick-connect gas pipeline connector of this utility model;

[0034] Figure 2 A schematic diagram showing the structural configuration of a quick-connect gas pipeline connector in use.

[0035] Figure 3 This is a schematic diagram of the connector seat.

[0036] Figure 4 This is a schematic diagram of the locking ring structure;

[0037] Figure 5 for Figure 4 Sectional view of section DD;

[0038] Figure 6 for Figure 5 A magnified view of a portion of the card tooth area;

[0039] Figure 7 This is a structural schematic diagram of the positioning support rod;

[0040] Figure 8 for Figure 1 A sectional view of section AA in the middle.

[0041] In the picture:

[0042] 100 - Positioning support rod; 110 - Operating part; 120 - Sealing ring limiting part; 130 - Locking ring limiting part; 140 - Limiting protrusion;

[0043] 200 - Inner ring; 300 - Inner ring sleeve; 400 - Inner sealing ring; 500 - Outer sealing ring;

[0044] 600-Locking ring; 610-Ring body; 611-Operating surface; 612-Pressure driving surface; 620-Clamping tooth; 621-Second end face; 622-Abutting surface; 623-First end face; 630-Cut surface; 640-Opening;

[0045] 700-Connector seat; 710-External thread; 720-Internal tapered bore; 730-External sealing ring groove; 740-Flange; 750-Pyramid; 760-First sealing hole; 770-Second sealing hole; 780-Limiting part; 790-Through hole;

[0046] 800 - Connecting pipe; 900 - Housing. Detailed Implementation

[0047] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0048] Please refer to Figure 1-8 This invention provides an embodiment of a quick-connect gas pipeline connector, comprising a positioning support rod 100, an inner ring 200, an inner ring sleeve 300, an inner sealing ring 400, an outer sealing ring 500, a locking ring 600, and a connector seat 700. For example, a quick-connect gas line connector can be used to connect the port of housing 900 and connecting pipe 800, wherein connector seat 700 is connected to the port of housing 900; outer sealing ring 500 forms a seal between connector seat 700 and housing 900; inner ring 200, inner ring sleeve 300, inner sealing ring 400 and locking ring 600 are all located in the connecting hole inside connector seat 700, inner ring 200 and inner ring sleeve 300 form an end sealing assembly, the end sealing assembly, inner sealing ring 400 and locking ring 600 are arranged sequentially in the connecting hole, wherein the end sealing assembly and inner sealing ring 400 form two seals between connecting pipe 800 and connecting hole of connector seat 700, which can prevent foreign objects such as dust from entering the connecting hole, and locking ring 600 is used to hold and lock connecting pipe 800 to prevent connecting pipe 800 from slipping or loosening. When the connecting pipe 800 is not installed, the positioning support rod 100 is inserted into the connector seat 700 to fix the relative positions of the end sealing assembly, the inner sealing ring 400, the locking ring 600 and the connector seat 700.

[0049] The first end of the connector 700 is the connecting end, such as... Figure 3 As shown, the first end of the connector 700 is machined with an external thread 710, and the port of the housing 900 is correspondingly provided with an internal thread, and the connector 700 is threadedly connected to the port of the housing 900. The second end of the connector 700 is a free end. After the connector 700 and the housing 900 are assembled, the second end of the connector 700 is located outside the housing 900. Preferably, the second end of the connector 700 is a prism 750, which facilitates disassembly and assembly with existing tooling. For example, the cross-section of the prism 750 is a regular hexagon, and the edges of the prism 750 are rounded.

[0050] The outer wall of the connector 700 is provided with a flange 740 and an outer sealing ring groove 730. The flange 740 and the outer sealing ring groove 730 are located between the external thread 710 and the prism 750, and the outer sealing ring groove 730 is located on the side of the flange 740 facing the first end of the connector 700.

[0051] The outer sealing ring 500 is located within the outer sealing ring groove 730. When the connector seat 700 is connected to the port of the housing 900, the outer sealing ring 500 forms a seal between the port of the housing 900 and the connector seat 700. The flange 740 increases the contact area between the outer sealing ring 500 and the connector seat 700, for example... Figure 8 When the minimum distance W between the outer sealing ring 500 and the outer surface of the prism 750 is too small, the flange 740 can prevent the outer sealing ring 500 from being squeezed out of the gap between the outer surface of the housing 900 and the outer surface of the prism 750, thus avoiding damage and affecting the sealing effect. Furthermore, the flange 740 can also provide a certain mechanical seal between the joint seat 700 and the housing 900, improving seismic resistance. Moreover, the flange 740 is circular, and its diameter is 2-4 mm larger than the circumscribed circle diameter of the prism 750.

[0052] like Figure 3 As shown, the connecting hole of the connector 700 includes an inner conical hole 720, a through hole 790, a first sealing hole 760, and a second sealing hole 770 connected in sequence. The inner conical hole 720 is opened on the end face of the first end of the connector 700, and the second sealing hole 770 is opened on the end face of the second end of the connector 700. The inner diameter of the first sealing hole 760 is smaller than the inner diameter of the second sealing hole 770, forming a stepped hole. The inner sealing ring 400 is disposed in the first sealing hole 760 and can achieve a sealing effect with the connecting pipe 800.

[0053] The second end face of the connector seat 700 is provided with a limiting part 780, which is preferably annular and extends radially upward into the inner side of the second sealing hole 770. The inner ring sleeve 300 is located inside the second sealing hole 770, with one end of the inner ring sleeve 300 abutting against the bottom wall of the second sealing hole 770, and the other end being limited by the limiting part 780. The inner surface of the inner ring sleeve 300 is provided with an annular sealing groove, and the inner ring 200 is located in the sealing groove of the inner ring sleeve 300. In practical applications, the inner ring sleeve 300 can be installed in the second sealing hole 770 first, and then the second end of the connector seat 700 can be partially or entirely deformed through bending, extrusion, or other processes to form the limiting part 780, which blocks the outer side of the inner ring sleeve 300.

[0054] The locking ring 600 mates with the inner tapered hole 720 to clamp the connecting pipe 800. For example... Figure 4-6As shown, the locking ring 600 has a C-shaped ring body 610 with a circumferential opening 640 extending along the entire axial direction of the ring body 610. The two ends of the ring body 610 in the axial direction are a mating end and an operating end, respectively. The mating end can extend into the inner tapered hole 720, and the outer surface of this end of the ring body 610 is a pressing drive surface 612, which is a tapered surface. By utilizing the clamping drive surface 612 and the inner conical hole 720, combined with the setting of the opening 640, the two ends of the ring 610 at the opening 640 can move closer or further apart. When the locking ring 600 moves towards the second end of the connector seat 700, the two ends of the ring 610 move closer together, and the space enclosed inside the ring 610 is compressed and reduced, thereby clamping the connecting pipe 800. When disassembling, the locking ring 600 moves away from the second end of the connector seat 700, and the two ends of the ring 610 move further apart, and the space enclosed inside the ring 610 can be increased, separating from the connecting pipe 800 for easy disassembly.

[0055] The operating end of the ring body 610 extends outward into the inner conical hole 720. The outer surface of this end of the ring body 610 is the operating surface 611, which is preferably a cylindrical surface. The operating surface 611 is connected to the larger outer diameter end of the clamping drive surface 612. When the locking ring 600 is engaged with the inner conical hole 720, the operating surface 611 is located outside the inner conical hole 720, which facilitates handling, clamping and other operations during disassembly and assembly.

[0056] Furthermore, the ring 610 has an axially extending thinned portion, and the ring 610 on both sides of the thinned portion forms two clamping portions. The wall thickness of the thinned portion is smaller than the wall thickness of the clamping portion. For example, a cross-section 630 is provided in the circumferential center of the outer surface of the ring 610. The cross-section 630 extends axially, causing a locally weakened thinned portion to form at the position corresponding to the cross-section 630 on the ring 610. The two sides of the thinned portion are the clamping portions. The thinned portion and the clamping portion are an integral structure, but the wall thickness of the thinned portion is significantly smaller than the wall thickness of the clamping portion, thereby greatly increasing the radial deformation of the two clamping portions. The two circumferential ends of the ring 610 can be more easily brought together or separated. It is understood that the cross-section 630 can be as follows: Figure 4 The plane shown can also be a curved surface.

[0057] To prevent the connecting pipe 800 from moving out of the second end of the connector seat 700, the inner side of the ring body 610 is also provided with retaining teeth 620. The retaining teeth 620 protrude from the inner side of the ring body 610 and extend circumferentially, preferably distributed throughout the entire circumference of the ring body 610.

[0058] The retaining tooth 620 has an abutment surface 622 coaxial with the connecting hole. The two sides of the abutment surface 622 are connected to the inner surface of the ring body 610 through the first end face 623 and the second end face 621, respectively. The abutment surface 622 is cylindrical, which can increase the contact area with the connecting tube 800. The large contact area between the abutment surface 622 and the connecting tube 800 can evenly press the pressure on the connecting tube 800, avoiding excessive damage to the connecting tube 800 due to localized stress and action, and avoiding the risk of the connecting tube 800 breaking after repeated insertions. The first end face 623 faces the operating end of the ring body 610, and the second end face 621 is a conical surface facing the mating end of the ring body 610. The second end face 621 guides the connecting tube 800 into the locking ring 600. The first end face 623 mates with the abutment surface 622 to lock the connecting tube 800. Preferably, the included angle β between the first end face 623 and the abutment surface 622 is 90°-95°, and the width of the abutment surface 622 is 0.05-0.3mm. This avoids scratching the outer wall of the connecting tube 800 while also preventing the abutment surface 622 from being too wide, which would reduce the pressure on the connecting tube 800 and affect the connection effect. The number of locking teeth 620 is preferably two or more.

[0059] Preferably, the cone angle θ of the inner conical hole 720 is equal to the cone angle α of the pressing drive surface 612. This identical taper fit provides self-locking characteristics, and the locking ring 600 exhibits good pressing properties, maintaining the tightness between the locking ring 600 and the connecting pipe 800. The cone angle θ of the inner conical hole 720 and the cone angle α of the pressing drive surface 612 are preferably 30°±5°. When the cone angle θ of the inner conical hole 720 and the cone angle α of the pressing drive surface 612 are at the above values, and the locking ring 600 is not subjected to external force when it abuts against the connector seat 700, the diameter of the abutment surface 622 is 0.3-0.5 mm smaller than the inner diameter of the pipe through hole 790, ensuring a good connection effect.

[0060] The positioning support rod 100 includes an operating part 110, a sealing ring limiting part 120, and a locking ring limiting part 130 connected as one unit. The outer diameter of the sealing ring limiting part 120 is smaller than the inner diameter of the inner ring 200 and the inner diameter of the inner sealing ring 400, while the outer diameter of the operating part 110 is larger than the inner diameter of the limiting part 780. The locking ring limiting part 130 is composed of multiple claws, which are spaced apart circumferentially. Two limiting protrusions 140 are provided on the outer wall of the claws, which are also spaced apart. In use, the operating part 110 is located outside the second end of the connector seat 700 and can cover the opening of the second sealing hole 770 on the end face of the second end of the connector seat 700. The sealing ring limiting part 120 is located inside the inner ring 200, the inner ring sleeve 300, and the inner sealing ring 400. The locking ring 600 is sleeved outside the locking ring limiting part 130 and is located between the two limiting protrusions 140. When the connecting pipe 800 is not installed, the positioning support rod 100 passes through the central axis of the inner ring 200, the inner ring sleeve 300, the inner sealing ring 400, the connector seat 700 and the locking ring 600, so that the entire assembly is assembled together.

[0061] During assembly and disassembly, the connector 700 is installed onto the port of the housing 900 via the external thread 710. The positioning support rod 100 is then removed. During removal, the multiple claws of the locking ring limiting part 130 can deform radially inward, simplifying the disassembly process. The connecting pipe 800 passes through the central axis of the connector 700 and the locking ring 600. The locking ring 600 secures the connecting pipe 800, while the inner ring 200 and inner ring sleeve 300 provide dust protection. The inner sealing ring 400 provides a seal with the connecting pipe 800, maintaining stable pressure in the air suspension system. To disassemble the connecting pipe 800, the connector 700 is removed, causing the locking ring 600 to deform and separate from the connecting pipe 800, thus completing the disassembly process.

[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A quick-connect fitting for gas pipelines, characterized in that, Includes end sealing assembly, inner sealing ring (400), outer sealing ring (500), locking ring (600) and connector seat (700); The connector seat (700) is provided with a connecting hole, which includes an inner conical hole (720), a through hole (790), a first sealing hole (760), and a second sealing hole (770) connected in sequence. The large end of the inner conical hole (720) is opened on the end face of the first end of the connector seat (700), and the second sealing hole (770) is opened on the end face of the second end of the connector seat (700). An outer sealing ring groove (730) is provided on the outer side wall of the connector seat (700). The inner sealing ring (400) is disposed in the first sealing hole (760); the end sealing assembly is located in the second sealing hole (770); the outer sealing ring (500) is located in the outer sealing ring groove (730); The locking ring (600) has a C-shaped ring body (610). The axial mating end of the ring body (610) can extend into the inner conical hole (720). The outer surface of this end is a pressing drive surface (612). The pressing drive surface (612) is a conical surface with the same inclination trend as the hole wall of the inner conical hole (720). The ring body (610) has an axially extending thinned portion. The ring body (610) on both sides of the thinned portion forms two clamping portions. The wall thickness of the thinned portion is smaller than the wall thickness of the clamping portion.

2. The quick-connect fitting for gas pipelines according to claim 1, characterized in that, The inner diameter of the first sealing hole (760) is smaller than the inner diameter of the second sealing hole (770); the second end face of the connector seat (700) is provided with a limiting part (780), which extends radially upward toward the inside of the second sealing hole (770); The end sealing assembly includes an inner ring (200) and an inner ring sleeve (300). The inner ring sleeve (300) is located inside the second sealing hole (770). One end of the inner ring sleeve (300) abuts against the bottom wall of the second sealing hole (770), and the other end is limited by the limiting part (780). The inner side of the inner ring sleeve (300) is provided with a sealing groove, and the inner ring (200) is located in the sealing groove.

3. A quick-connect fitting for gas pipelines according to claim 1, characterized in that, It also includes a positioning support rod (100), which includes an operating part (110), a sealing ring limiting part (120) and a locking ring limiting part (130) connected in sequence. The locking ring limiting part (130) includes a plurality of circumferentially spaced claws, and two limiting protrusions (140) are spaced apart on the outer wall of the claws. In use, the positioning support rod (100) is inserted into the connecting hole, the operating part (110) is located outside the second end of the connector seat (700), the sealing ring limiting part (120) limits the end sealing assembly and the inner sealing ring (400), the locking ring (600) is sleeved outside the locking ring limiting part (130) and is located between the two limiting protrusions (140), and the operating part (110) covers the opening of the second sealing hole (770) on the second end face of the connector seat (700).

4. A quick-connect fitting for gas pipelines according to claim 1, characterized in that, The cone angle θ of the inner conical hole (720) is equal to the cone angle α of the pressing drive surface (612); And / or, the cone angle θ of the inner cone hole (720) and the cone angle α of the pressing drive surface (612) are in the range of 30°±5°; And / or, the operating end of the ring body (610) extends outward from the inner conical hole (720).

5. A quick-connect fitting for gas pipelines according to claim 1, characterized in that, The outer side of the connector seat (700) is provided with a flange (740), which is located on the side of the outer sealing ring groove (730) away from the first end of the connector seat (700).

6. A quick-connect fitting for gas pipelines according to claim 5, characterized in that, The first end of the connector (700) is machined with an external thread (710), and the second end of the connector (700) is a prism (750).

7. A quick-connect fitting for gas pipelines according to claim 6, characterized in that, The flange (740) is circular, and its diameter is 2-4 mm larger than the circumcircle diameter of the prism (750); And / or, the cross-section of the prism (750) is a regular hexagon.

8. A quick-connect fitting for gas pipelines according to claim 1, characterized in that, The inner surface of the ring (610) is provided with locking teeth (620), which extend and are distributed throughout the circumference of the ring (610).

9. A quick-connect fitting for gas pipelines according to claim 8, characterized in that, The locking tooth (620) has an abutment surface (622), which is a cylindrical surface and coaxial with the connecting hole. The two sides of the abutment surface (622) are connected to the inner surface of the ring body (610) through a first end face (623) and a second end face (621), respectively. The first end face (623) faces the operating end of the ring body (610), and the second end face (621) is a conical surface facing the mating end of the ring body (610).

10. A quick-connect fitting for gas pipelines according to claim 9, characterized in that, The angle β between the first end face (623) and the abutting surface (622) is 90°-95°; And / or, the width of the abutment surface (622) is 0.05-0.3 mm; And / or, the number of the locking teeth (620) is two; And / or, the diameter of the contact surface (622) is 0.3-0.5 mm smaller than the inner diameter of the through hole (790).

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