Butt-joint self-locking anti-loosening union for air supply pipeline of railway vehicle

Abstract

The rail vehicle air supply pipeline butt joint self-locking anti-loosening union comprises a self-locking nut, an external thread connector and a movable connector, the side, provided with external threads, of the external thread connector abuts against the side, provided with a first boss, of the movable connector, and cambered surface grooves are symmetrically formed in the positions, at the external threads, of the external thread connector; a self-locking thread ring is arranged between the external thread connector and the movable connector, the self-locking thread ring is provided with thread shifting blocks matched with the external threads corresponding to the cambered surface grooves, and the end of the self-locking nut buckles the first boss and is in threaded connection with the external thread connector. The invention aims to provide the anti-loosening union for the telescopic pipe of the air supply pipeline, which is tight in connection and capable of avoiding distortion and breakage caused by thermal deformation and buffer hard links.

Description

Technical Field

[0001] The present invention relates to the technical field of railway pipeline docking, and in particular to a self-locking and anti-loosening oil joint for the air supply pipeline of rail vehicles. Background Art

[0002] In order to solve the problem of the safety of pipeline connections in the railway passenger car braking system, various technical solutions have been proposed in the same industry. However, during the operation of the train, there will inevitably be problems such as the loosening of threaded pipe fittings and thermal deformation, which affect the driving safety. Conventional threaded pipe fittings will malfunction when encountering thermal deformation and buffer hard connections. Therefore, there is an urgent need for a telescopic pipe anti-loosening oil joint for the air supply pipeline that has a tight connection and can avoid distortion and fracture caused by thermal deformation and buffer hard connections. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, and aims to provide a telescopic pipe anti-loosening oil joint for the air supply pipeline that has a tight connection and can avoid distortion and fracture caused by thermal deformation and buffer hard connections.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] A self-locking and anti-loosening oil joint for the air supply pipeline of rail vehicles includes a self-locking nut, an external thread joint, and a union joint. The side of the external thread joint with external threads abuts against the side of the union joint with a first boss. Arc-shaped grooves are symmetrically arranged at the external thread of the external thread joint. A self-locking thread ring is arranged between the external thread joint and the union joint. The self-locking thread ring is provided with thread sliders matching the external threads corresponding to each arc-shaped groove. The end of the self-locking nut buckles the first boss and is threadedly connected to the external thread joint.

[0006] Further, a second boss is arranged at the end of the external thread joint, and an annular groove for the second boss to be embedded is provided in the inner ring of the self-locking thread ring.

[0007] Further, an annular recess is arranged at the edge of the inner hole of the external thread joint, and a sealing ring is arranged in the annular recess.

[0008] Further, an inner boss is arranged at the edge of the self-locking nut, and the inner boss abuts against the first boss.

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

[0010] The present invention can simultaneously solve the problems of loosening, thermal deformation, and leakage of threaded pipe fittings during train operation. After the self-locking nut is connected to the external thread joint, under the screwing pressure of the self-locking nut and the union nut, the self-locking thread ring is extruded, causing the thread block to further elastically deform, restricting the loosening of the self-locking nut and the external thread joint, and playing a self-locking role. At the same time, the sealing ring is synchronously extruded to seal the docking surface of the external thread joint and the union nut, thereby synchronously implementing self-locking to prevent the loosening or leakage of the pipeline connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural view of the present invention;

[0012] Figure 2 is a sectional view of the present invention;

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

[0014] Figure 4 is a schematic structural view of the external thread joint in the present invention;

[0015] Figure 5 is a schematic structural view of the self-locking thread ring in the present invention;

[0016] Figure 6 is a schematic structural view of the union nut in the present invention;

[0017] Figure 7 is a schematic structural view of the self-locking nut in the present invention.

[0018] DESCRIPTION OF THE REFERENCE NUMERALS:

[0019] 1 - external thread joint, 2 - self-locking thread ring, 3 - sealing ring, 4 - union nut, 5 - self-locking nut, 6 - arc-shaped groove, 7 - first boss, 8 - annular recess, 9 - thread block, 10 - annular groove, 11 - second boss, 12 - inner boss. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The present invention will be described in detail below with reference to the drawings and in conjunction with embodiments.

[0021] As Figures 1 to 7 shown, a self-locking and anti-loosening oil joint for the air supply pipeline of a rail vehicle includes a self-locking nut 5, an external thread joint 1, and a union nut 4. The side of the external thread joint 1 with external threads abuts against the side of the union nut 4 with a first boss 7. Arc-shaped grooves 6 are symmetrically arranged at the external threads of the external thread joint 1. A self-locking thread ring 2 is arranged between the external thread joint 1 and the union nut 4. The self-locking thread ring 2 is provided with thread blocks 9 matching the external threads corresponding to the respective arc-shaped grooves 6. The end of the self-locking nut 5 buckles the first boss 7 and is threadedly connected to the external thread joint 1.

[0022] Among them, a second boss 11 is provided at the end of the external thread joint 1. An annular groove 10 capable of embedding the second boss 11 is provided in the inner ring of the self-locking thread ring 2. The annular groove 10 is used for sleeving the self-locking thread ring 2 to maintain central positioning.

[0023] Among them, an annular recess 8 is provided at the edge of the inner hole of the external thread joint 1. A sealing ring 3 is provided in the annular recess 8 for sealing the butt joint surface between the external thread joint 1 and the union joint 4.

[0024] Among them, an inner boss 12 is provided at the edge of the self-locking nut 5, and the inner boss 12 abuts against the first boss 7. After the self-locking nut 5 is connected to the external thread joint 1, the inner boss 12 pushes the first boss 7 forward. The self-locking thread ring 2 is squeezed by the first boss 7, causing the thread dial block 9 to further elastically deform, so that the external thread of the external thread joint 1 cannot match the thread dial block 9, restricting the loosening of the self-locking nut 5 and the external thread joint 1, and playing a self-locking role. At the same time, the sealing ring 3 is synchronously squeezed to seal the butt joint surface between the external thread joint 1 and the union joint 4, thereby synchronously implementing self-locking to prevent problems such as loosening or leakage of the pipeline connection.

[0025] The present invention can buffer and offset the hard connection between the air supply pipelines and the vibration generated during the running of the train, solve the safety hazards of leakage of the flowing medium in the pipeline caused by the influence or fracture of thermal deformation and torsional deformation, so as to ensure the safety performance of the braking system for controlling the running of the train.

[0026] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-locking and anti-loosening oil pipe coupling for an orbital vehicle air supply pipeline, comprising a self-locking nut (5), an external thread joint (1) and a union joint (4), characterized in that: The side of the external thread joint (1) with external threads abuts against the side of the union joint (4) with the first boss (7). Arc-shaped grooves (6) are symmetrically arranged at the external threads of the external thread joint (1). A self-locking thread ring (2) is arranged between the external thread joint (1) and the union joint (4). The self-locking thread ring (2) is provided with thread dialing blocks (9) matching the external threads corresponding to the respective arc-shaped grooves (6). The end of the self-locking nut (5) buckles the first boss (7) and is threadedly connected to the external thread joint (1).

2. The self-locking and anti-loosening oil-free coupling for the air supply pipeline of a rail vehicle according to claim 1, characterized in that: A second boss (11) is arranged at the end of the external thread joint (1). An annular groove (10) capable of allowing the second boss (11) to be embedded is provided in the inner ring of the self-locking thread ring (2).

3. The self-locking and anti-loosening oil pipe for the air supply pipeline of a rail vehicle according to claim 2, characterized in that: An annular recess (8) is arranged at the edge of the inner hole of the external thread joint (1). A sealing ring (3) is arranged in the annular recess (8).

4. A self-locking and anti-loosening oil-free coupling for the air supply pipeline of a rail vehicle according to claim 1, characterized in that: An inner boss (12) is arranged at the edge of the self-locking nut (5). The inner boss (12) abuts against the first boss (7).

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