A type of anti-loosening pipe fitting and connecting pipe assembly

Abstract

This utility model discloses an anti-loosening connecting pipe and connecting pipe assembly, including a connecting pipe body, an anti-loosening joint, a mating joint, and an anti-loosening element sleeved outside the anti-loosening joint. The connecting pipe body of the anti-loosening joint has first and second anti-rotation limiting portions spaced axially, and the anti-loosening element has first and second anti-rotation mating portions that mate with it. An elastic reset element is provided between the connecting pipe body and the anti-loosening element. By axially moving the anti-loosening element relative to the connecting pipe body, three positions can be switched: in the normal first position, the anti-loosening element is circumferentially limited with the anti-loosening joint and locked with the mating joint; in the second position, the anti-loosening element can rotate relative to the anti-loosening joint to adjust the circumferential phase, facilitating alignment with the mating joint; in the third position, the anti-loosening element is mated and limited by the second anti-rotation limiting portion. This utility model solves the problem of difficult assembly alignment caused by the fixed phase in traditional anti-loosening structures, significantly improving assembly convenience and efficiency while maintaining reliable anti-loosening performance.

Description

Technical Field

[0001] This utility model relates to the field of pipeline installation technology, and in particular to an anti-loosening type connecting pipe and connecting pipe assembly. Background Technology

[0002] In the field of mechanical connections, threaded connections are widely used due to their simple structure and convenient assembly and disassembly. However, their inherent drawback is that they are prone to loosening under vibration, impact, or variable loads, leading to connection failure. Therefore, various thread anti-loosening structures have been developed, among which a type based on the ratchet principle has gradually become widely adopted.

[0003] This type of structure typically includes an externally threaded locking connector, an internally threaded mating connector, and a locking element mounted on the locking connector. The locking element is circumferentially fixed to the locking connector via a keyway, toothed ring, or polygonal fit, while the end faces of the locking element and the mating connector are equipped with matching one-way ratchet surfaces. During assembly, after the mating connector contacts the ratchet surface of the locking element during tightening, it can continue to rotate in the tightening direction to achieve engagement and locking, but cannot be loosened in the opposite direction, thus achieving the purpose of preventing loosening.

[0004] However, this type of existing anti-loosening structure has a significant limitation: because the anti-loosening component and the anti-loosening connector are always in a circumferentially fixed state, the circumferential phase of the ratchet surface on the anti-loosening component cannot be adjusted. Therefore, during assembly, the mating connector must be continuously rotated until the tooth groove of its end face ratchet is completely aligned with the tooth tip of the anti-loosening component's ratchet to achieve final locking. In practice, assemblers often find it difficult to tighten the mating connector to the preset phase in one go, often needing to overtighten and then slightly back out to find the engagement point, or failing to fully lock due to inaccurate alignment. This assembly method has poor fault tolerance, heavily relies on operational experience, and is particularly difficult to implement in space-constrained scenarios, significantly reducing assembly efficiency and user experience.

[0005] Furthermore, in practical applications, the mating fittings required for equipment connection—including mating pipe bodies and mating joints—often cannot be installed to the intended position due to the limited length of the mating pipe body (such as faucets and interfaces). Therefore, it is necessary to provide a non-loosening reinforcement pipe structure. This structure should include a non-loosening joint and a connected reinforcement pipe body, extending to the target installation position while ensuring that the non-loosening performance is not weakened by the structural extension. Currently, there is a lack of threaded connection solutions that can guarantee the non-loosening function while also offering adjustable length and convenient assembly. Utility Model Content

[0006] The purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and to provide an anti-loosening type pipe fitting and connecting pipe assembly.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a non-loosening connecting pipe, comprising a connecting pipe body, wherein at least one end of the connecting pipe body is provided with a non-loosening connector that can be threadedly connected to a mating connector, and a non-loosening element is sleeved on the non-loosening connector; the non-loosening connector includes a connector body, wherein the connector body is provided with a first anti-rotation limiting portion and a second anti-rotation limiting portion spaced apart along the axial direction; the non-loosening element is provided with a first anti-rotation mating portion and a second anti-rotation mating portion respectively adapted to the first anti-rotation limiting portion and the second anti-rotation limiting portion; and further comprising an elastic reset element disposed between the outer wall of the connector body and the inner wall of the non-loosening element, wherein the non-loosening element has at least three axial positions relative to the connector body. The first position is the normal position, where the elastic reset element is in a naturally extended state, the first anti-rotation fitting part is circumferentially limited to the first anti-rotation limiting part, and the anti-loosening member can be circumferentially connected and locked to the mating joint; the second position is the adjustment position during the axial compression stroke, where the first anti-rotation fitting part is separated from the first anti-rotation limiting part, and the second anti-rotation fitting part has not reached the position of the second anti-rotation limiting part. At this time, the anti-loosening member can rotate circumferentially relative to the anti-loosening joint; the third position is where the first anti-rotation fitting part is separated from the first anti-rotation limiting part, while the second anti-rotation fitting part and the second anti-rotation limiting part maintain a circumferentially limited fit.

[0008] As a preferred embodiment of this utility model, a limiting step is provided on the outer wall of the connector body, and a compression spring is fitted onto the outer wall of the connector body as the elastic reset element, with the two ends of the compression spring respectively axially abutting against the end face of the limiting step and the end face of the first anti-rotation mating part of the anti-loosening member.

[0009] As a preferred embodiment of this utility model, a gasket is also provided on the outer periphery of the connector body. The gasket abuts axially against the end face of the limiting step, and its outer diameter is larger than the outer diameter of the limiting step. A blocking part is provided on the inner wall of the connector body near the second anti-rotation mating part. When sliding axially, the blocking part can abut against the gasket to achieve axial limiting.

[0010] As a preferred embodiment of the present invention, the first anti-rotation limiting part and / or the second anti-rotation limiting part are external toothed rings formed on the outer wall of the connector body, and the first anti-rotation mating part and / or the second anti-rotation mating part are internal toothed ring holes provided on the inner wall of the anti-loosening member and matching the external toothed ring.

[0011] As a preferred embodiment of this utility model, the first anti-rotation limiting part is an outer toothed ring formed on the outer wall of the connector body, and the first anti-rotation mating part is an inner toothed ring hole provided on the inner wall of the anti-loosening member and matching the outer toothed ring; the second anti-rotation limiting part is at least one limiting protrusion distributed circumferentially along the outer wall of the connector body, and the second anti-rotation mating part is a limiting groove provided on the inner wall of the anti-loosening member and adapted to the shape of the limiting protrusion.

[0012] As a preferred embodiment of the present invention, the cross-section of the first anti-rotation limiting part and / or the second anti-rotation limiting part is polygonal, forming a polygonal column; the first anti-rotation fitting part and / or the second anti-rotation fitting part is a polygonal hole with a cross-sectional shape matching it.

[0013] As a preferred embodiment of the present invention, the first anti-rotation limiting part and / or the second anti-rotation limiting part are radial protruding keys fixedly disposed on the outer wall of the connector body; the first anti-rotation mating part and / or the second anti-rotation mating part are axial keyways formed on the inner wall of the anti-loosening member and slidingly mating with the radial protruding key.

[0014] A connecting pipe assembly includes an anti-loosening connecting pipe and a mating fitting. The mating fitting includes a mating connector and a mating pipe body. The mating connector has a connector portion with an internal threaded hole. One end of the connector body connected to the mating connector is provided with an external threaded post. The anti-loosening component has a mounting groove at one end facing the connector portion, and the mounting groove can be circumferentially connected and fixed with the connector portion.

[0015] As a preferred embodiment of this utility model, the mounting groove is a polygonal cavity and the connector is a polygonal column.

[0016] As a preferred embodiment of this utility model, the anti-loosening component is provided with at least one protruding rib at one end facing the joint; the corresponding position of the joint is provided with a groove matching the protruding rib, and the protruding rib can be inserted into the groove to restrict the circumferential rotation of the mating joint.

[0017] Compared with existing technologies, the advantages of this invention are as follows: This invention utilizes axially spaced first and second anti-rotation limiting parts and their corresponding anti-loosening components, along with an elastic reset element to allow the anti-loosening component to switch between three axial positions. This allows the anti-loosening component to lock in place with the mating joint in the first position (i.e., achieving the connection between the anti-loosening connector and the mating fitting), and to rotate circumferentially in the second position to flexibly adjust the phase. This greatly improves the ease of assembly alignment and effectively avoids the operational difficulties of repeated tightening or retraction for alignment required in traditional structures. Simultaneously, a second set of limiting structures maintains temporary positioning in the third position, improving operational stability and reliability. Addressing the problems of vibration and limitation by the length of mating fittings in existing pipe threaded connections, the structure proposed in this paper significantly improves assembly efficiency and adaptability to operating conditions while maintaining excellent anti-loosening performance. Furthermore, it can be implemented through various specific mating methods, demonstrating strong versatility. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention; Figure 2 This is a cross-sectional view of Embodiment 1 of this utility model; Figure 3 This is a structural schematic diagram of Embodiment 1 of the present invention; Figure 4 This is an exploded view of the anti-loosening joint in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the structure of Embodiment 2 of this utility model; Figure 6 This is a schematic diagram of the bottom structure of the anti-loosening joint in Embodiment 2 of this utility model; Figure 7 This is an exploded view of the anti-loosening joint in Embodiment 3 of this utility model; Figure 8 This is a structural schematic diagram of Embodiment 4 of this utility model; Figure 9 This is a structural schematic diagram of Embodiment 5 of this utility model.

[0019] Reference numerals: 1. Anti-loosening connector; 2. Mating connector; 3. External threaded post; 4. Internal threaded hole; 5. Anti-loosening element; 6. Connector body; 7. First anti-rotation limiting part; 8. Second anti-rotation limiting part; 9. First anti-rotation mating part; 10. Second anti-rotation mating part; 11. Elastic reset element; 12. Mounting groove; 13. Connector part; 14. Rib; 15. Groove; 16. Limiting step; 17. External gear ring; 18. Internal gear ring hole; 19. Limiting protrusion; 20. Limiting groove; 21. Blocking part; 22. Gasket; 23. Connecting pipe body; 24. Mating fitting; 25. Mating pipe body. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0022] like Figure 1-4 The illustrated anti-loosening type connecting pipe and connecting pipe assembly includes a connecting pipe body 23, at least one end of which is provided with an anti-loosening connector 1 that can be threadedly connected to a mating connector 2. An anti-loosening element 5 is sleeved on the anti-loosening connector 1. The anti-loosening connector 1 has an external threaded post 3. The mating connector 2 has an internal threaded hole 4 that mates with the external threaded post 3. The anti-loosening connector 1 is also sleeved on the anti-loosening element 5. The assembly also includes a mating pipe fitting 24, which includes a mating connector 2 and a mating pipe body 25. The mating connector 2 has a connector portion 13. The anti-loosening connector 1 includes a connector body 6 located above the external threaded post 3. The connector body 6 is provided with a first anti-rotation limiting portion 7 and a second anti-rotation limiting portion 8 spaced apart axially. The anti-loosening element 5 is provided with portions respectively adapted to the first anti-rotation limiting portion 7 and the second anti-rotation limiting portion 8. The device includes a first anti-rotation fitting part 9 and a second anti-rotation fitting part 10; it also includes an elastic reset element 11 disposed between the outer wall of the connector body 6 and the inner wall of the anti-loosening member 5. The anti-loosening member 5 has at least three axial positions relative to the connector body 6: First position: the normal position, where the elastic reset element 11 is in a naturally extended state, the first anti-rotation fitting part 9 is circumferentially limited by the first anti-rotation limiting part 7, and the anti-loosening member 5 can be circumferentially connected and locked with the mating connector 2; Second position: the adjustment position during the axial compression stroke, where the first anti-rotation fitting part 9 is separated from the first anti-rotation limiting part 7, and the second anti-rotation fitting part 10 has not reached the position of the second anti-rotation limiting part 8. At this time, the anti-loosening member 5 can rotate circumferentially relative to the anti-loosening connector 1, and is aligned with the mating connector 2 to achieve circumferential connection and fixation; Figure 2As shown, in the third position, the first anti-rotation fitting part 9 is separated from the first anti-rotation limiting part 7, while the second anti-rotation fitting part 10 maintains a circumferential limiting fit with the second anti-rotation limiting part 8. If the third position is not provided, the joint body 6 will rotate synchronously when the mating joint 2 is turned, affecting the assembly. It should also be noted that the anti-loosening joint 1 and the mating joint 2 are relative terms. In this application, it is mentioned that the anti-loosening joint 1 is provided with an external threaded post 3 and the mating joint 2 is provided with an internal threaded hole 4. Similarly, it can also be that the anti-loosening joint 1 is provided with an internal threaded hole 4 and the mating joint 2 is provided with an external threaded post 3. When the anti-loosening component 5 is in the first position, the anti-loosening connector 1 of the connecting pipe body 23 is circumferentially connected and fixed with the mating connector 2. At this time, the anti-loosening connector 1, the mating connector 2, and the anti-loosening component 5 form a fixed component to prevent the threads from loosening. When the anti-loosening component 5 is in the second position, the anti-loosening component 5 can be rotated to align its position with the mating connector 2, and then the anti-loosening component can be pushed back from the second position to the first position to be connected and fixed with the mating connector 2. When the anti-loosening component 5 is in the third position, the mating connector 2 rotates relative to the anti-loosening connector 1 to achieve thread engagement. Since the user holds the anti-loosening component 5, the anti-loosening connector and the connecting pipe body 23 will not rotate with the mating connector 2, which facilitates assembly.

[0023] This invention utilizes axially spaced first and second anti-rotation limiting parts 8 and their corresponding anti-loosening parts 5, and employs an elastic reset element 11 to switch the anti-loosening parts 5 between three axial positions. This allows the anti-loosening parts 5 to be locked in place with the mating joint 2 in the first position, and to rotate circumferentially in the second position to flexibly adjust the phase (preventing the anti-loosening parts 5 from failing to align with the mating joint 2). This significantly improves assembly alignment convenience and effectively avoids the operational difficulties of repeated tightening or retraction for alignment required in traditional structures. Simultaneously, a second set of limiting structures maintains temporary positioning in the third position, improving operational stability and reliability. This structure, while ensuring excellent anti-loosening performance, significantly improves assembly efficiency and adaptability to different working conditions, and can be implemented through various specific mating methods, demonstrating strong versatility.

[0024] The anti-loosening structure of this application is applicable to threaded joint scenarios, especially for pipeline systems subject to vibration or pulse pressure, including but not limited to the following applications: civil pipelines: faucet valve core - faucet body, valve - water supply pipe, water supply pipe for fabric processing or washing equipment (washing machine inlet pipe), shower hose connector; industrial pipelines: hydraulic pipe - pump body interface, air compressor quick connector - flange, cooling pipe - equipment port; special connections: fire hydrant - water hose interface, gas meter - gas transmission pipe, cooling pipeline for new energy vehicle batteries. In this application, the anti-loosening component 5 and the two connectors can be made of metal or injection-molded engineering plastics. Here is an example of a usage scenario (any scenario with threaded connection is acceptable, not limited to the following scenario): one end of the fitting pipe 24 is connected to the washing machine, and the other end is provided with a fitting connector 2. The fitting connector 2 can be directly connected to the faucet, or it can be connected to the anti-loosening connector 1 and then fixed to the faucet. Considering that the existing washing machine fitting pipe 24 has a limited length, the placement position of the washing machine needs to be considered when connecting to the water source. However, washing machines are usually placed in a preset position, so the existence of the extension pipe is very important. It can extend the length of the fitting pipe 24 while preventing the connection of the extension pipe body 23 from loosening due to vibration.

[0025] The anti-loosening component 5 has an installation groove 12 at one end facing the mating joint 2. The mating joint 2 has a connector part 13 that can extend into the installation groove 12. The connector part 13 has the internal threaded hole 4. When the connector part 13 is inserted into the installation groove 12, the anti-loosening component 5 is circumferentially connected and fixed to the mating joint 2.

[0026] like Figure 1 , 3 As shown, the mounting groove 12 is a polygonal (trilateral, quadrilateral, hexagonal, etc.) cavity, and the connector 13 is a polygonal column.

[0027] like Figure 2 As shown, a limiting step 16 is fixed or integrally provided on the outer wall of the connector body 6. A compression spring, as an elastic reset element 11, is fitted onto the outer wall of the connector body 6, and the two ends of the compression spring axially abut against the end face of the limiting step 16 and the end face of the first anti-rotation mating part 9 of the anti-loosening member 5, respectively. Figure 2 This is a schematic diagram of the upright position. If the compression spring is not installed in this application, the anti-loosening part 5 will slide towards the blocking part 21 when it is inverted. In the normal state of the compression spring (i.e., not subjected to external force), the first anti-rotation fitting part 9 and the first anti-rotation limiting part 7 maintain circumferential limiting fit.

[0028] A gasket 22 is also fitted around the outer periphery of the connector body 6. The gasket 22 abuts axially against the end face of the limiting step 16, and its outer diameter is larger than the outer diameter of the limiting step 16. A blocking part 21 is provided on the inner wall of the connector body 6 near the second anti-rotation mating part 10. When sliding axially, the blocking part can abut against the gasket to achieve axial limiting.

[0029] like Figure 4 As shown, the first anti-rotation limiting part 7 and / or the second anti-rotation limiting part 8 are external toothed rings 17 formed on the outer wall of the connector body 6, and the first anti-rotation mating part 9 and / or the second anti-rotation mating part 10 are internal toothed ring holes 18 provided on the inner wall of the anti-loosening member 5 and matching the external toothed ring 17. Example

[0030] The difference between this embodiment 2 and embodiment 1 is that the circumferential limiting structure connects the mating joint 2 and the anti-loosening joint 1.

[0031] like Figure 5 , 6 As shown, the anti-loosening component 5 has at least one protruding rib 14 at one end facing the joint portion 13; the corresponding position of the joint portion 13 has a groove 15 that matches the protruding rib 14, and the protruding rib 14 can be inserted into the groove 15 to restrict the circumferential rotation of the mating joint 2. In this embodiment, at least one protruding rib 14 is provided, preferably four are arranged in an array on the anti-loosening component 5, or other quantities (selected according to the actual situation). Example

[0032] The difference between this embodiment three and embodiments one and two is the structure of the first anti-rotation limiting part 7, the second anti-rotation limiting part 8, the first anti-rotation fitting part 9, and the second anti-rotation fitting part 10.

[0033] like Figure 7 As shown, the first anti-rotation limiting part 7 is an external toothed ring 17 formed on the outer wall of the connector body 6, and the first anti-rotation mating part 9 is an internal toothed ring hole 18 provided on the inner wall of the anti-loosening member 5 and matching the external toothed ring 17; the second anti-rotation limiting part 8 is at least one limiting protrusion 19 distributed circumferentially along the outer wall of the connector body 6, and the second anti-rotation mating part 10 is a limiting groove 20 provided on the inner wall of the anti-loosening member 5 and adapted to the shape of the limiting protrusion 19. Example

[0034] The difference between this embodiment four and embodiments one, two, and three is the structure of the first anti-rotation limiting part 7, the second anti-rotation limiting part 8, the first anti-rotation mating part 9, and the second anti-rotation mating part 10.

[0035] like Figure 8 As shown, the cross-section of the first anti-rotation limiting part 7 and / or the second anti-rotation limiting part 8 is polygonal, forming a polygonal column; the first anti-rotation fitting part 9 and / or the second anti-rotation fitting part 10 are polygonal holes with matching cross-sectional shapes. Example

[0036] The difference between this fifth embodiment and embodiments one, two, three, and four is the structure of the first anti-rotation limiting part 7, the second anti-rotation limiting part 8, the first anti-rotation mating part 9, and the second anti-rotation mating part 10.

[0037] like Figure 9 As shown, the first anti-rotation limiting part 7 and / or the second anti-rotation limiting part 8 are radial protruding keys fixedly provided on the outer wall of the connector body 6; the first anti-rotation mating part 9 and / or the second anti-rotation mating part 10 are axial keyways opened on the inner wall of the anti-loosening part 5 and slidingly mating with the radial protruding key. In addition to the above scheme, other structures that can achieve the same circumferential constraint function are also applicable.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples of this utility model and are not intended to limit it. Various changes and modifications can be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A type of anti-loosening connecting pipe, comprising a connecting pipe body (23), wherein at least one end of the connecting pipe body (23) is provided with an anti-loosening connector (1) that can be threadedly connected to a mating connector (2), and an anti-loosening element (5) is sleeved on the anti-loosening connector (1); characterized in that: The anti-loosening connector (1) includes a connector body (6), which has a first anti-rotation limiting part (7) and a second anti-rotation limiting part (8) spaced apart along the axial direction; the anti-loosening member (5) has a first anti-rotation fitting part (9) and a second anti-rotation fitting part (10) respectively adapted to the first anti-rotation limiting part (7) and the second anti-rotation limiting part (8); it also includes an elastic reset element (11) disposed between the outer wall of the connector body (6) and the inner wall of the anti-loosening member (5), and the anti-loosening member (5) has at least three axial positions relative to the connector body (6): the first position: is the normal position, the elastic reset element (11) is in a naturally extended state, the first anti-rotation fitting part (9) is in a naturally extended state, the first anti-rotation fitting part (10 ...9) is in a naturally extended state, the first anti-rotation fitting part (9) is in a naturally extended state, the first anti-rotation fitting part (9) is in a naturally extended state, the first anti-rotation fitting part (9) is in a naturally extended state, the first anti-rotation fitting part (9) is in a naturally extended state, the first anti-rotation fitting part (9) is in a naturally extended state, The first position is a circumferentially limited engagement of the first anti-rotation limiting part (7) with the second anti-loosening part (5) and the second anti-loosening part (5) can be circumferentially connected and locked with the mating joint (2); the second position is an adjustment position in the axial compression stroke, in which the first anti-rotation mating part (9) is separated from the first anti-rotation limiting part (7), and the second anti-rotation mating part (10) does not reach the position of the second anti-rotation limiting part (8). At this time, the anti-loosening part (5) can rotate circumferentially relative to the anti-loosening joint (1); the third position is that the first anti-rotation mating part (9) is separated from the first anti-rotation limiting part (7), while the second anti-rotation mating part (10) and the second anti-rotation limiting part (8) maintain a circumferentially limited engagement.

2. The anti-loosening type connecting pipe according to claim 1, characterized in that: The outer wall of the connector body (6) is provided with a limiting step (16), and a compression spring is fitted on the outer wall of the connector body (6) as the elastic reset element (11). The two ends of the compression spring are respectively axially abutted against the end face of the limiting step (16) and the end face of the first anti-rotation mating part (9) of the anti-loosening member (5).

3. The anti-loosening type connecting pipe according to claim 2, characterized in that: A gasket (22) is also fitted around the outer periphery of the connector body (6). The gasket (22) abuts axially against the end face of the limiting step (16), and its outer diameter is larger than the outer diameter of the limiting step (16). A blocking part (21) is provided on the inner wall of the connector body (6) near the second anti-rotation fitting part (10). When sliding axially, the blocking part (21) can abut against the gasket (22) to achieve axial limiting.

4. The anti-loosening type connecting pipe according to any one of claims 1-3, characterized in that: The first anti-rotation limiting part (7) and / or the second anti-rotation limiting part (8) are external toothed rings (17) formed on the outer wall of the connector body (6), and the first anti-rotation fitting part (9) and / or the second anti-rotation fitting part (10) are internal toothed ring holes (18) provided on the inner wall of the anti-loosening member (5) and matching the external toothed ring (17).

5. The anti-loosening type connecting pipe according to any one of claims 1-3, characterized in that: The first anti-rotation limiting part (7) is an outer toothed ring (17) formed on the outer wall of the connector body (6), and the first anti-rotation fitting part (9) is an inner toothed ring hole (18) provided on the inner wall of the anti-loosening member (5) and matching the outer toothed ring (17); the second anti-rotation limiting part (8) is at least one limiting protrusion (19) distributed circumferentially along the outer wall of the connector body (6), and the second anti-rotation fitting part (10) is a limiting groove (20) provided on the inner wall of the anti-loosening member (5) and adapted to the shape of the limiting protrusion (19).

6. The anti-loosening type connecting pipe according to any one of claims 1-3, characterized in that: The first anti-rotation limiting part (7) and / or the second anti-rotation limiting part (8) have a polygonal cross-section, forming a polygonal column; the first anti-rotation fitting part (9) and / or the second anti-rotation fitting part (10) are polygonal holes with a cross-sectional shape matching it.

7. The anti-loosening type connecting pipe according to any one of claims 1-3, characterized in that: The first anti-rotation limiting part (7) and / or the second anti-rotation limiting part (8) are radial protruding keys fixedly provided on the outer wall of the connector body (6); the first anti-rotation fitting part (9) and / or the second anti-rotation fitting part (10) are axial keyways opened on the inner wall of the anti-loosening member (5) and slidingly fitting with the radial protruding key.

8. A connecting pipe assembly, comprising the anti-loosening connecting pipe according to any one of claims 1-7, characterized in that: It also includes a fitting (24) for connection with the anti-loosening type connecting pipe. The fitting (24) includes a fitting joint (2) and a fitting pipe body (25). The fitting joint (2) has a joint portion (13) with an internal threaded hole (4). The end of the joint body (6) connected to the fitting joint (2) is provided with an external threaded post (3). The anti-loosening component (5) has an installation groove (12) at one end facing the joint portion (13). The installation groove (12) can be circumferentially connected and fixed with the joint portion (13).

9. The connecting pipe assembly according to claim 8, characterized in that: The mounting groove (12) is a polygonal cavity, and the connector (13) is a polygonal column.

10. The connecting pipe assembly according to claim 8, characterized in that: The anti-loosening component (5) has at least one protruding rib (14) at one end facing the joint (13); the corresponding position of the joint (13) has a groove (15) matching the protruding rib (14), and the protruding rib (14) can be inserted into the groove (15) to restrict the circumferential rotation of the mating joint (2).

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