Railway vehicle air supply pipeline telescopic pipe anti-loose butt joint device

Abstract

The utility model discloses a railway vehicle air supply pipeline telescopic pipe anti-loose butt joint device which comprises a movable joint, an external thread joint and a locking nut, the side, provided with external threads, of the external thread joint abuts against the side, provided with a first boss, of the movable joint, and an internal thread joint is arranged on the other side of the external thread joint. A telescopic pipe is fixedly connected between the external thread connector and the internal thread connector, cambered surface grooves are symmetrically formed in the positions, at external threads, of the external thread connector, locking threads are arranged between the external thread connector and the movable connector, and thread shifting blocks matched with the external threads are arranged on the locking threads and correspond to the cambered surface grooves. And the end part of the locking nut buckles the first boss and is in threaded connection with the external thread joint. The utility model aims to provide the anti-loose butt joint device for the air supply pipeline, which is tight in connection and can avoid distortion and breakage caused by thermal deformation and buffer hard links.

Description

Technical Field

[0001] This utility model relates to the field of railway pipeline connection technology, and in particular to a device for preventing loosening of the expansion joint of the air supply pipeline of a rail vehicle. Background Technology

[0002] To address the safety issues of pipeline connections in railway passenger car braking systems, various technical solutions have been proposed within the industry. However, during train operation, issues such as loosening of threaded pipes and thermal deformation inevitably arise, affecting train safety. Conventional threaded pipes are prone to failure when subjected to thermal deformation and hard-connected buffers. Therefore, there is an urgent need for a tight-fitting anti-loosening connection device for air supply pipelines that can prevent twisting, deformation, and breakage caused by thermal deformation and hard-connected buffers. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and to provide a tight-fitting air supply pipeline anti-loosening connection device that can avoid thermal deformation and buffer hard links that cause twisting deformation and breakage.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A device for preventing loosening of a telescopic pipe in a rail vehicle's air supply pipeline includes a union, an external threaded joint, and a locking nut. The external threaded joint has an external thread side that abuts against the side of the union with a first boss. An internal threaded joint is provided on the other side of the external threaded joint. A telescopic pipe is fixedly connected between the external threaded joint and the internal threaded joint. The external threaded joint has symmetrically arranged arc-shaped grooves at its external thread. A locking thread is provided between the external threaded joint and the union. A threaded pawl matching the external thread is provided for each arc-shaped groove corresponding to the locking thread. The end of the locking nut engages with the first boss and is threadedly connected to the external threaded joint. The end of the external threaded joint has a second boss. The inner ring of the locking thread has an annular groove that allows the second boss to be inserted. Both the external threaded joint and the internal threaded joint have a shoulder at the end connected to the telescopic pipe.

[0006] Furthermore, the inner edge of the external threaded connector is provided with an annular recess, and a sealing ring is provided inside the annular recess.

[0007] Furthermore, the telescopic tube has at least four protruding convex circles in the middle, and both sides of the telescopic tube have concave recesses that fit and weld with the shoulder.

[0008] Furthermore, the edge of the locking nut is provided with an inner boss, which abuts against the first boss.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] This invention simultaneously solves problems such as loosening of threaded pipe fittings, thermal deformation, buffered hard connections, and fracture prevention during train operation. The connection method between the locking nut, union, and external threaded connector facilitates the engagement and disengagement of air supply pipes between carriages. Furthermore, the locking threads, compressed by the locking nut, deform the threaded block, preventing it from matching the external thread of the external threaded connector. This creates a self-locking structure between the locking nut and the external threaded connector, ensuring a tight and reliable connection and preventing loosening of the threaded pipe fittings. The telescopic tube connects the external threaded connector and the internal threaded connector. When the entire device undergoes thermal deformation due to the air supply pipe, the telescopic tube compensates for this deformation. Because the telescopic tube is welded onto the threaded connector and the internal threaded connector, it not only solves the problems of thermal expansion and contraction and torsional deformation but also prevents fracture due to vibration frequency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 for Figure 1 A sectional view;

[0013] Figure 3 This is an exploded view of the present invention;

[0014] Figure 4 This is a schematic diagram of the external threaded connector in this utility model;

[0015] Figure 5 This is a schematic diagram of the telescopic tube in this utility model;

[0016] Figure 6 This is a schematic diagram of the internal threaded connector in this utility model;

[0017] Figure 7 This is a schematic diagram of the locking thread structure in this utility model;

[0018] Figure 8 This is a schematic diagram of the structure of the live joint in this utility model;

[0019] Figure 9 This is a schematic diagram of the locking nut in this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-External threaded connector, 2-Expansion tube, 3-Internal threaded connector, 4-Locking thread, 5-Sealing ring, 6-Joint, 7-Locking nut, 9-Arc groove, 10-Second boss, 11-Annular recess, 12-Shoulder, 13-Raised circle, 14-Inner recess, 15-Threaded pry block, 16-Annular groove, 17-First boss, 18-Nut, 19-Inner boss. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] like Figures 1 to 9 As shown, a non-loosening connection device for the expansion joint of a rail vehicle air supply pipeline includes a union joint 6, an external threaded joint 1, and a locking nut 7. The side of the external threaded joint 1 with external threads abuts against the side of the union joint 6 with a first boss 17. An internal threaded joint 3 is provided on the other side of the external threaded joint 1. An expansion joint 2 is fixedly connected between the external threaded joint 1 and the internal threaded joint 3. The external threaded joint 1 has symmetrical arc-shaped grooves 9 at the external threads. A locking thread 4 is provided between the external threaded joint 1 and the union joint 6. The locking thread 4 is provided with threaded pry blocks 15 that match the external threads for each arc-shaped groove 9.

[0024] The external threaded connector 1 has a second boss 10 at its end, and the inner ring of the locking thread 4 has an annular groove 16 that allows the second boss 10 to be inserted. The annular groove 16 is used to fit the locking thread 4 to maintain the center positioning of the locking thread 4.

[0025] The inner edge of the external threaded connector 1 is provided with an annular recess 11, and a sealing ring 5 is provided in the annular recess 11 for sealing the mating surface of the external threaded connector 1 and the live connector 6.

[0026] The locking nut 7 has an inner boss 19 on its edge, which abuts against the first boss 17. After the locking nut 7 passes through the nut 18 of the union 6 and connects to the external threaded connector 1, the inner boss 19 pushes the first boss 17 forward. The locking thread 4 is squeezed by the first boss 17, causing the thread lever 15 to undergo further elastic deformation, making it impossible for the external thread of the external threaded connector 1 to match the thread lever 15. This prevents the locking nut 7 from loosening with the external threaded connector 1, thus achieving a self-locking effect. At the same time, the sealing ring 5 is also squeezed, sealing the mating surfaces of the external threaded connector 1 and the union 6, thereby simultaneously implementing self-locking to prevent the pipeline connection from becoming loose or leaking.

[0027] Both the external threaded connector 1 and the internal threaded connector 3 have a shoulder 12 at the end connected to the telescopic pipe 2. The telescopic pipe 2 has at least four protruding convex rings 13 in its middle section, and recesses 14 on both sides that fit and are welded to the shoulders 12. The telescopic pipe 2 connects the external threaded connector 1 and the internal threaded connector 3. When the entire device undergoes thermal deformation due to the air supply pipeline, the telescopic pipe 2 can compensate between the external threaded connector 1 and the internal threaded connector 3. Since the telescopic pipe 2 is fitted onto and welded to the external threaded connector 1 and the internal threaded connector 3, and because it has protruding rings 13, these rings can compensate for thermal expansion and contraction and torsional deformation, preventing vibration-induced breakage.

[0028] This docking device can buffer and offset the hard links between air supply pipelines and the vibrations generated during train operation. It solves the safety hazards of gas leakage caused by thermal deformation and torsional deformation or breakage, ensuring the safe performance of the braking system in controlling train operation. The device as a whole can simultaneously solve problems such as loose threaded pipe fittings, thermal deformation, buffering hard links, and breakage, so as to ensure a firm connection and sealing performance.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for preventing loosening of the expansion joint of a railway vehicle air supply pipeline, comprising a union joint (6), an external threaded joint (1), and a locking nut (7), characterized in that: The external threaded connector (1) abuts against the side of the live connector (6) with the first boss (17) on one side. An internal threaded connector (3) is provided on the other side of the external threaded connector (1). A telescopic tube (2) is fixedly connected between the external threaded connector (1) and the internal threaded connector (3). The external threaded connector (1) is symmetrically provided with arc-shaped grooves (9) at the external thread. A locking thread (4) is provided between the external threaded connector (1) and the live connector (6). The locking thread (4) corresponds to each arc-shaped groove. 9) A threaded block (15) matching the external thread is provided. The end of the locking nut (7) is engaged with the first boss (17) and threadedly connected to the external threaded connector (1). The end of the external threaded connector (1) is provided with a second boss (10). The inner ring of the locking thread (4) has an annular groove (16) that allows the second boss (10) to be inserted. Both the external threaded connector (1) and the internal threaded connector (3) are provided with a shoulder (12) at the end connected to the telescopic tube (2).

2. The anti-loosening connection device for the expansion joint of the air supply pipeline of a rail vehicle according to claim 1, characterized in that: The inner edge of the external threaded connector (1) is provided with an annular recess (11), and a sealing ring (5) is provided inside the annular recess (11).

3. The anti-loosening connection device for the expansion joint of the air supply pipeline of a rail vehicle according to claim 1, characterized in that: The telescopic tube (2) has at least four protruding convex circles (13) in the middle, and the telescopic tube (2) has concave recesses (14) on both sides that fit and weld with the shoulder (12).

4. The anti-loosening connection device for the expansion joint of the air supply pipeline of a rail vehicle according to claim 1, characterized in that: The locking nut (7) has an inner boss (19) on its edge, which abuts against the first boss (17).

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