Air brake pipe device for railway wagon

Abstract

The utility model discloses an air brake pipe device for a railway wagon, which relates to accessories of railway locomotives and comprises a middle pipe body, an air inlet end and an air outlet end of the middle pipe body are respectively provided with an upper joint and a lower joint, the upper joint is used for being in butt joint with equipment capable of outputting an air source or the air outlet end of the pipe body, and the lower joint is used for being in butt joint with the air outlet end of the pipe body. The lower connector is used for being in butt joint with an air inlet of air braking equipment. According to the air brake pipe device for the railway wagon, the lower connector comprises the sealing sleeve and the combined sealing ring, and it is guaranteed that the sealing state can be kept for a long time.

Description

Technical Field

[0001] This utility model relates to railway locomotive and rolling stock parts, specifically to an air brake pipe device for railway freight cars. Background Technology

[0002] The brake pipes of the air brake system are important components of railway freight cars. During the release, operation, and braking processes of railway freight cars, the brake pipe systems of each car in the train need to be kept sealed. If the brake pipe system of a car in the train leaks air, it will cause the train to stop or even lead to an accident.

[0003] Currently, the brake pipes of air braking systems for railway freight cars are generally steel pipes with connectors welded to both ends. Each connector is joined by a two-hole flange and a sealing ring, and then the two flanges are tightened with bolts. This allows one end of the brake pipe to be sealed to the air compressor or pipe body of the air supply through a flange, and the other end to be sealed to the air inlet of the air braking device through a flange. In this way, the air supply can be input into the air braking device through the brake pipe to exert the braking effect.

[0004] Current brake pipe connection methods are prone to gas leakage. The main reasons for gas leakage in the air brake systems of railway freight cars are: 1. Cracks easily appear in the welds at the brake pipe joints, causing leakage. 2. The brake pipe joint plane is not parallel or aligned with the flange plane of the equipment, causing the seal to fail and leak. 3. The two-piece flange of the brake pipe has insufficient rigidity in the middle, failing to tighten the joint and causing the seal to fail and leak. These phenomena frequently affect the normal operation of trains and require time-consuming inspection and repair.

[0005] The reason for this is that there is currently a lack of air brake pipe devices that have no brake pipe welds and can maintain a sealed state for a long time, in order to reduce the failure rate of brake pipes in current railway freight cars and ensure the normal operation of trains. Utility Model Content

[0006] To address the aforementioned problems, the purpose of this utility model is to provide an air brake pipe device for railway freight cars, which solves the current lack of air brake pipe devices without weld seams and capable of maintaining a sealed state for a long time.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This utility model discloses an air brake pipe device for railway freight cars, including an intermediate pipe body. The air inlet end and the air outlet end of the intermediate pipe body are respectively provided with an upper connector and a lower connector. The upper connector is used to connect with the air outlet end of a device that can output air source or a pipe body, and the lower connector is used to connect with the air inlet of the air brake device.

[0009] Preferably, both the upper and lower connectors include a frustum-shaped tube, a fixing ring, a mating flange, and a sealing sleeve. The fixing rings of the upper and lower connectors are respectively disposed at both ends of the intermediate tube body, and the outer diameter of the fixing ring is larger than the outer diameter of the intermediate tube body. The frustum-shaped tube has a larger outer diameter at one end and a smaller outer diameter at the other end, forming a frustum shape. The fixing rings of the upper and lower connectors are respectively connected to the intermediate tube body through their respective frustum-shaped tubes. The mating flange of the upper connector is sleeved on the outer wall of the corresponding frustum-shaped tube, and the mating flange of the upper connector is sealed to the fixing ring by the sealing sleeve. The mating flange of the lower connector is sleeved on the outer wall of the corresponding frustum-shaped tube, and the mating flange of the lower connector is sealed to the fixing ring by the sealing sleeve. The air brake device is equipped with an external mating flange, and the mating flange of the lower connector is mated to the external mating flange of the air brake device. The device or pipe body capable of outputting an air source is equipped with an external mating flange, and the mating flange of the upper connector is mated to the external mating flange of the air compressor or pipe body capable of outputting an air source.

[0010] Preferably, the frustum-shaped tube of the upper connector and the frustum-shaped tube of the lower connector have the same inner diameter as the intermediate tube body, and the fixing ring of the upper connector, the frustum-shaped tube, the intermediate tube body, and the frustum-shaped tube and fixing ring of the lower connector are integrally formed.

[0011] Preferably, the sealing sleeve is a spherical arc-shaped splicing sleeve, including a left hemispherical arc-shaped part and a right hemispherical arc-shaped part, which are spliced ​​together to form a complete ring to form the sealing sleeve; wherein, the inner wall of the left hemispherical arc-shaped part and the inner wall of the right hemispherical arc-shaped part together form a complete annular inner arc surface, and the edge of the inner arc surface protrudes inward to form an annular flange; the mating flanges of the upper connector and the lower connector are provided with spherical arc-shaped holes, and the shape of the hole wall of the spherical arc-shaped holes is a spherical arc surface; the fixing ring of the upper connector and the lower connector includes a fixing ring outer end face, a fixing ring outer wall face, and a fixing ring inner end face, the fixing ring outer wall face is located on the outer side of the fixing ring, and the fixing ring outer end face and the fixing ring inner end face are respectively located at both ends of the fixing ring, and The inner end face of the fixing ring is the end face of the fixing ring near the frustum-shaped tube; the outer wall faces of the fixing rings of the upper and lower connectors protrude outward to form the inner end faces of the fixing rings of the upper and lower connectors, and a step is formed between the inner end face of the fixing ring and the outer wall of the frustum-shaped tube; when the mating flanges of the upper and lower connectors are sealed with their respective fixing rings by sealing sleeves, the inner annular arc surface of the sealing sleeve is fitted onto the outer wall face of the fixing ring of the upper or lower connector, and the annular flange of the sealing sleeve is precisely engaged on the step formed between the inner end face of the fixing ring of the upper or lower connector and the outer wall of the frustum-shaped tube; the hole wall of the spherical arc-shaped hole of the mating flange of the upper or lower connector is fitted onto the outer wall of the sealing sleeve.

[0012] Preferably, bolt holes are provided at both ends of the mating flanges of the upper connector and the lower connector, and the two bolt holes are located on both sides of the spherical arc hole; the two bolt holes are respectively used to insert bolts to connect with the external mating flange.

[0013] Preferably, the lower connector is further equipped with a torsion fine-tuning mechanism, which includes an arc-shaped spherical surface and a ball-and-socket surface. The lower connector also includes a combined sealing ring, which is disposed at the connection between the external flange of the air brake device and the flange of the lower connector. The combined sealing ring includes a copper skeleton ring, and the arc-shaped spherical surface is disposed at the end of the outer wall of the copper skeleton ring of the combined sealing ring of the lower connector. The connection between the outer end face of the fixing ring of the lower connector and the inner wall of the frustum-shaped tube is configured as a spherical arc surface to form the ball-and-socket surface, and the arc-shaped spherical surface is adapted to the ball-and-socket surface of the fixing ring of the lower connector. When the flange of the lower connector is torsion relative to the external flange of the air brake device, the ball-and-socket surface of the fixing ring of the lower connector can slide on the arc-shaped spherical surface at the end of the outer wall of the copper skeleton ring of the combined sealing ring.

[0014] Preferably, the combined sealing ring of the lower connector further includes a rubber sleeve. The outer wall of the copper skeleton ring of the combined sealing ring of the lower connector includes a cylindrical side surface of the copper ring outer wall and an arc-shaped spherical surface. The end face of the copper skeleton ring protrudes outward and is configured as the arc-shaped spherical surface, and the arc-shaped spherical surface is adapted to the ball-and-socket surface of the fixing ring of the lower connector. The rubber sleeve is fitted on the cylindrical side surface of the copper ring outer wall of the copper skeleton ring. The rubber sleeve of the combined sealing ring of the lower connector includes an inner end face, an outer end face, and an outer wall surface. The inner end face and the outer end face are located at the two ends of the rubber sleeve, respectively, and the outer wall surface is located on the outer side surface of the rubber sleeve.

[0015] When the mating flange of the lower connector is mated with the external mating flange of the air brake device, the arc-shaped spherical surface of the copper skeleton ring of the lower connector's combined sealing ring is precisely embedded in the spherical socket surface of the lower connector's fixing ring, matching the inner wall of the spherical socket surface. The inner end face of the rubber sleeve of the lower connector's combined sealing ring is tightly against the outer end face of the fixing ring of the lower connector, and the inner arc surface of the sealing sleeve covers the outer wall surface of the rubber sleeve of the lower connector's rubber sleeve. The inner wall of the external mating flange of the air brake device is tightly against the outer wall surface of the rubber sleeve of the copper skeleton ring of the lower connector's combined sealing ring.

[0016] Preferably, the rubber sleeve of the combined sealing ring of the lower connector has an inner ring groove and an outer ring groove respectively provided on the inner end face and the outer end face of the rubber sleeve.

[0017] Preferably, the connection between the outer end face of the fixing ring of the upper connector and the inner wall of the frustum-shaped tube is set at a right angle; and the outer end face of the fixing ring of the upper connector is flush with the end faces of the left and right hemispherical arc surfaces of the sealing sleeve of the upper connector and the end face of the mating flange of the upper connector, so that the outer end face of the upper connector forms a plane.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] (I) This utility model discloses an air brake pipe device for railway freight cars, comprising an intermediate pipe body. The air inlet and outlet ends of the intermediate pipe body are respectively provided with an upper connector and a lower connector. Each of the upper and lower connectors includes a frustum-shaped tube, a fixing ring, a connecting flange, and a sealing sleeve. The fixing rings of the upper and lower connectors are respectively located at both ends of the intermediate pipe body, and the outer diameter of the fixing ring is larger than the outer diameter of the intermediate pipe body. The frustum-shaped tube has a larger outer diameter at one end and a smaller outer diameter at the other end, forming a frustum shape. The fixing rings of the upper and lower connectors are connected to the intermediate pipe body via their respective frustum-shaped tubes. Connection; the upper connector's mating flange is sleeved on the outer wall of the corresponding frustum-shaped tube, and the mating flange of the upper connector is sealed to the fixing ring by a sealing sleeve; the lower connector's mating flange is sleeved on the outer wall of the corresponding frustum-shaped tube, and the mating flange of the lower connector is sealed to the fixing ring by a sealing sleeve; wherein, the air brake device is equipped with an external mating flange, and the mating flange of the lower connector is mated to the external mating flange of the air brake device; the device or pipe body capable of outputting an air source is equipped with an external mating flange, and the mating flange of the upper connector is mated to the external mating flange of the air compressor or pipe body capable of outputting an air source.

[0020] (II) This utility model discloses an air brake pipe device for railway freight cars. The frustum-shaped tubes of the upper and lower connectors have the same inner diameter as the intermediate pipe body, and the fixing ring, frustum-shaped tube, and intermediate pipe body of the upper connector, as well as the frustum-shaped tube and fixing ring of the lower connector, are integrally formed. Therefore, the air brake pipe device for railway freight cars disclosed in this utility model does not require welding of the connectors and pipe bodies. It adopts a spherical fit between the combined sealing ring and the connector, and the spherical arc splicing ferrule and the flange, which can improve the problem of sealing ring failure caused by non-parallelism between flange connectors. It has the advantage of improving the reliability and service life of the brake pipe. Since the connector and flange structure dimensions of the integrated brake pipe of this utility model are comparable to the structure dimensions of the existing brake pipe system, it can be completely interchanged with the existing brake pipe.

[0021] (III) This utility model discloses an air brake pipe device for railway freight cars. The lower connector is also equipped with a torsion fine-tuning mechanism, which includes an arc-shaped spherical surface and a ball-and-socket surface. The lower connector also includes a combined sealing ring, which is disposed at the connection between the external flange of the air brake device and the flange of the lower connector. The combined sealing ring includes a copper skeleton ring. The arc-shaped spherical surface is disposed at the end of the outer wall of the copper skeleton ring of the combined sealing ring of the lower connector. The connection between the outer end face of the fixing ring of the lower connector and the inner wall of the frustum-shaped tube is set as a spherical arc surface to form the ball-and-socket surface, and the arc-shaped spherical surface is adapted to the ball-and-socket surface of the fixing ring of the lower connector. When the flange of the lower connector is torsion relative to the external flange of the air brake device, the ball-and-socket surface of the fixing ring of the lower connector can slide on the arc-shaped spherical surface at the end of the outer wall of the copper skeleton ring of the combined sealing ring. The torsion fine-tuning mechanism configured in the lower connector can meet the requirement that the lower connector can be torsion within a small angle range after being connected to the external flange of the air brake equipment. After being connected to the air inlet of the air brake equipment, the middle tube near the lower connector can be torsion at a relatively small angle as needed during use.

[0022] (iv) This utility model discloses an air brake pipe device for railway freight cars, the lower connector of which includes a sealing sleeve and a combined sealing ring to ensure that the sealing state can be maintained for a long time. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the air brake pipe device for railway freight cars provided in Embodiment 1 of this utility model;

[0024] Figure 2 This is a side view of the lower connector and the external mating flange provided in Embodiment 1 of this utility model.

[0025] Figure 3 This is an isometric view of the lower connector and the external mating flange provided in Embodiment 1 of this utility model.

[0026] Figure 4 yes Figure 3 Axonometric view of the lower joint after removing the external mating flange;

[0027] Figure 5 yes Figure 3 Front view;

[0028] Figure 6 yes Figure 5 A sectional view along the MM direction in the middle;

[0029] Figure 7 yes Figure 4 Front view;

[0030] Figure 8 yes Figure 7 A cross-sectional view along the NN direction in the middle;

[0031] Figure 9 yes Figure 3 Exploded view.

[0032] Explanation of reference numerals in the attached diagram: A - upper connector, B - lower connector;

[0033] 100 - External flange; 101 - Bolt; 102 - Nut; 200 - Vent hole;

[0034] 1-Intermediate tube body, 11-Frustum-shaped tube, 12-Fixing ring, 13-Outer end face of fixing ring, 14-Outer wall surface of fixing ring, 15-Inner end face of fixing ring, 16-Spherical socket surface;

[0035] 2-Butt flange, 20-Spherical arc-shaped hole, 21-Bolt hole;

[0036] 3-Sealing sleeve, 31-Left hemispherical arc surface, 32-Right hemispherical arc surface, 33-Inner annular arc surface, 34-Annular flange;

[0037] 4-Combined sealing ring, 41-Copper skeleton ring, 412-Cylindrical part of outer wall of copper ring, 411-Arched spherical part; 42-Rubber sleeve, 421-Inner end face of rubber sleeve, 422-Outer end face of rubber sleeve, 423-Outer wall surface of rubber sleeve, 424-Inner ring groove, 425-Outer ring groove. Detailed Implementation

[0038] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0039] To address the current lack of air brake pipe devices without welded joints and capable of maintaining a long-term sealed state, the frustum-shaped tubes of the upper and lower connectors have the same inner diameter as the intermediate pipe body. Furthermore, the fixing ring of the upper connector, the frustum-shaped tube, and the intermediate pipe body, as well as the frustum-shaped tube and fixing ring of the lower connector, are integrally formed. Therefore, the air brake pipe device for railway freight cars disclosed in this utility model eliminates the need for welding between the connectors and the pipe body. In addition, the lower connector includes a sealing sleeve and a combined sealing ring, ensuring a long-term sealed state.

[0040] Example 1: An air brake pipe device for railway freight cars

[0041] Embodiment 1 of this utility model provides an air brake pipe device for railway freight cars, and its structure will be described in detail below with reference to the accompanying drawings.

[0042] refer to Figure 1 The air brake pipe device for railway freight cars includes an intermediate pipe body 1. The air inlet end and the air outlet end of the intermediate pipe body 1 are respectively provided with an upper connector A and a lower connector B. The upper connector A is used to connect with the air outlet end of the equipment or pipe body that can output air source, and the lower connector B is used to connect with the air inlet of the air brake equipment.

[0043] Specifically, both the upper connector A and the lower connector B include a frustum-shaped tube 11, a retaining ring 12, a mating flange 2, and a sealing sleeve 3.

[0044] refer to Figures 2 to 9 and combined Figure 1 The fixing rings 12 of the upper connector A and the lower connector B are respectively disposed at both ends of the intermediate tube 1, and the outer diameter of the fixing ring 12 is larger than the outer diameter of the intermediate tube 1. The outer diameter of the frustum-shaped tube 11 is larger at one end and smaller at the other end, forming a frustum shape. The fixing rings 12 of the upper connector A and the lower connector B are respectively connected to the intermediate tube 1 through their respective frustum-shaped tubes 11, so that the outer diameter of the intermediate tube 1 and the outer diameter of the fixing ring 12 form a transition from small to large through the outer diameter of the frustum-shaped tube 11.

[0045] Continue to refer to Figures 2 to 9 The upper connector A's mating flange 2 is fitted onto the outer wall of the corresponding frustum-shaped tube 11, and the mating flange 2 of the upper connector A is sealed to the fixing ring 12 by a sealing sleeve 3; the lower connector B's mating flange 2 is fitted onto the outer wall of the corresponding frustum-shaped tube 11, and the mating flange 2 of the lower connector B is sealed to the fixing ring 12 by a sealing sleeve 3. Specifically, both the upper connector A's mating flange 2 and the lower connector B's mating flange 2 are provided with spherical arc-shaped holes 20. When the upper connector A's mating flange 2 is sealed to the fixing ring 12 by a sealing sleeve 3 and the lower connector B's mating flange 2 is sealed to the fixing ring 12 by a sealing sleeve 3, the spherical arc-shaped holes 20 of the upper connector A's mating flange 2 and the lower connector B's mating flange 2 are respectively connected to the intermediate tube body 1.

[0046] The air brake device is equipped with an external docking flange 100, and the external docking flange 100 is provided with a vent hole 200. The docking flange 2 of the lower connector B docks with the external docking flange 100 of the air brake device, and the vent hole 200 of the external docking flange 100 of the air brake device is connected to the intermediate pipe body 1.

[0047] The device or pipe that can output air source is equipped with an external docking flange 100, and the external docking flange 100 is provided with a vent hole 200. The docking flange 2 of the upper connector A is docked with the external docking flange 100 of the device or pipe that can output air source, and the vent hole 200 of the external docking flange 100 of the air compressor or pipe that can output air source is connected to the intermediate pipe 1.

[0048] Continue to refer to Figures 2 to 9 The frustum-shaped tube 11 of the upper connector A and the frustum-shaped tube 11 of the lower connector B have the same inner diameter as the intermediate tube body 1, and the fixing ring 12 of the upper connector A, the frustum-shaped tube 11, the intermediate tube body 1, and the frustum-shaped tube 11 and fixing ring 12 of the lower connector B are integrally formed.

[0049] Specifically, the fixing ring 12, frustum-shaped tube 11, and intermediate tube 1 of the upper connector A, as well as the frustum-shaped tube 11 and fixing ring 12 of the lower connector B, are made of seamless steel pipe or stainless steel pipe, wherein the steel pipe is cut to the designed length.

[0050] More specifically, the fixing ring 12, frustum-shaped tube 11 and intermediate tube 1 of the upper connector A, as well as the frustum-shaped tube 11 and fixing ring 12 of the lower connector B, are manufactured simultaneously during hot pressing to achieve integral molding.

[0051] Since the fixing ring 12 of the upper connector A and the fixing ring 12 of the lower connector B are manufactured simultaneously with the frustum-shaped tube 11 during hot pressing, and since their outer diameter decreases while their inner diameter remains the same, their wall thickness gradually decreases. This results in a gradual change in the cross-section between the fixing ring 12 of the upper connector A, the fixing ring 12 of the lower connector B, and the intermediate tube 1, which can greatly reduce fatigue stress at the cross-section change and prevent the intermediate tube 1 from breaking due to alternating stress.

[0052] Since the fixing ring 12 of the upper connector A, the fixing ring 12 of the lower connector B, the frustum-shaped tube 11, and the intermediate tube body 1 are manufactured as a single unit with the same raw material properties, and there is no welding interface between the fixing ring 12 of the upper connector A, the fixing ring 12 of the lower connector B and the intermediate tube body 1, the air brake pipe device for railway freight cars can be guaranteed to have reliable sealing performance and the ability to prevent fatigue damage.

[0053] Because the brake pipe is made by welding the joint body, which was originally made by casting and machining, to the steel pipe instead of by using die forging, extrusion deformation or spinning process, the manufacturing process is simple and the production cost is reduced.

[0054] refer to Figure 6 , Figure 8 and Figure 9As a specific implementation of the sealing sleeve 3 between the mating flange 2 of the upper connector A and the fixing ring 12 of the lower connector B, the sealing sleeve 3 is a spherical arc splicing sleeve, including a left hemispherical arc part 31 and a right hemispherical arc part 32, which are spliced ​​together to form a complete ring to form the sealing sleeve 3.

[0055] The inner walls of the left hemispherical arc surface 31 and the right hemispherical arc surface 32 together form a complete annular inner arc surface 33, and the edge of the inner arc surface 33 protrudes inward to form an annular flange 34. The sealing sleeve 3 is configured in pairs for use as a set, the purpose of which is to simplify the manufacturing process by eliminating the need to first assemble the sealing sleeve 3 and the mating flange 2 during the manufacturing of the integrated brake pipe.

[0056] Specifically, the left hemispherical arc-shaped part 31 and the right hemispherical arc-shaped part 32 are integrally made of high-strength alloy steel or stainless steel through machining, and then cut into two symmetrical pieces from the center line of the sealing sleeve 3 for use.

[0057] The mating flanges 2 of the upper connector A and the lower connector B are provided with spherical arc-shaped holes 20, and the shape of the hole wall of the spherical arc-shaped holes 20 is a spherical arc surface;

[0058] The fixing ring 12 of the upper connector A and the lower connector B includes an outer end face 13, an outer wall face 14, and an inner end face 15. The outer wall face 14 is located on the outer side of the fixing ring 12. The outer end face 13 and the inner end face 15 are located at the two ends of the fixing ring 12, respectively. The inner end face 15 is the end face of the fixing ring 12 that is closer to the frustum-shaped tube 11.

[0059] The outer wall surface 14 of the fixing ring of the upper connector A and the lower connector B protrudes outward, that is, the thickness of the fixing ring 12 is higher than the outer wall of the frustum-shaped tube 11 connected to it, so as to form the inner end face 15 of the fixing ring 12 of the upper connector A and the lower connector B, and a step is formed between the inner end face 15 of the fixing ring and the outer wall of the frustum-shaped tube 11.

[0060] When the mating flanges 2 of the upper connector A and the lower connector B are sealed with their respective fixing rings 12 by the sealing sleeves 3, the inner annular arc surface 33 of the sealing sleeve 3 is fitted on the outer wall surface 14 of the fixing ring 12 of the upper connector A or the lower connector B, and the annular flange 34 of the sealing sleeve 3 is precisely engaged on the step formed between the inner end face 15 of the fixing ring of the upper connector A or the lower connector B and the outer wall of the frustum-shaped tube 11.

[0061] The spherical arc-shaped hole 20 of the mating flange 2 of the upper connector A or the lower connector B is fitted onto the outer wall of the sealing sleeve 3.

[0062] The outer wall surface 14 of the fixing ring 12 of the upper connector A and the lower connector B is used to mate with the inner annular arc surface 33 of the sealing sleeve 3. The inner end face 15 of the fixing ring of the upper connector A and the lower connector B mates with the annular flange 34 of the sealing sleeve 3, used to position and constrain the sealing sleeve 3. The annular flange 34 on the inner annular arc surface 33 is used to engage with the inner end face 15 of the fixing ring 12 of the upper connector A and the lower connector B, so that the fixing ring 12 of the upper connector A and the lower connector B can be engaged inside the sealing sleeve 3 and cannot be withdrawn backward.

[0063] As a specific implementation method for connecting the mating flange 2 with the external mating flange 100, bolt holes 21 are respectively provided at both ends of the mating flange 2 of the upper connector A and the lower connector B, and the two bolt holes 21 are located on both sides of the spherical arc hole 20; the two bolt holes 21 are respectively used to pass bolts through and connect with the external mating flange 100.

[0064] Specifically, when the two bolt holes 21 of the external mating flange 100 are aligned with the bolt holes 21 at both ends of the mating flange 2 of the upper connector A and the lower connector B, the bolts 101 pass through the two aligned bolt holes 21 respectively and are tightened with nuts 102.

[0065] Because the intermediate tube 1 near the lower connector B often needs to be twisted at a relatively small angle during use after docking with the air inlet of the air brake device, the lower connector B is also equipped with a torsion fine-tuning mechanism to meet the requirement that the lower connector B can be twisted within a small angle range after docking with the external flange 100 of the air brake device.

[0066] refer to Figure 6 , Figure 8 and Figure 9 The torsional fine-tuning mechanism includes an arc-shaped spherical surface 411 and a ball-and-socket surface 16.

[0067] The lower connector B also includes a combined sealing ring 4, which is disposed at the connection between the external docking flange 100 of the air brake device and the docking flange 2 of the lower connector B.

[0068] The combined sealing ring 4 includes a copper skeleton ring 41. The arc-shaped spherical part 411 is disposed at the end of the outer wall of the copper skeleton ring 41 of the combined sealing ring 4 of the lower connector B. The connection between the outer end face 13 of the fixing ring 12 of the lower connector B and the inner wall of the frustum-shaped tube 11 is set as a spherical arc surface to form the ball-and-socket surface 16, and the arc-shaped spherical part 411 is adapted to the ball-and-socket surface 16 of the fixing ring 12 of the lower connector B.

[0069] When the mating flange 2 of the lower connector B is twisted relative to the external mating flange 100 of the air brake device, the ball-and-socket surface 16 of the retaining ring 12 of the lower connector B can slide on the arc-shaped spherical surface 411 at the end of the outer wall of the copper skeleton ring 41 of the combined sealing ring 4.

[0070] To ensure a sealing effect, as a specific implementation of the torsion fine-tuning mechanism, the combined sealing ring 4 of the lower connector B further includes a rubber sleeve 42. The outer wall of the copper skeleton ring 41 of the combined sealing ring 4 of the lower connector B includes a cylindrical side surface 412 and an arc-shaped spherical surface 411. The end face of the copper skeleton ring 41 protrudes outward and is set as the arc-shaped spherical surface 411. The rubber sleeve 42 is fitted on the cylindrical side surface 412 of the copper skeleton ring 41.

[0071] The rubber sleeve 42 of the combined sealing ring 4 of the lower connector B includes an inner end face 421, an outer end face 422, and an outer wall surface 423. The inner end face 421 and the outer end face 422 are located at the two ends of the rubber sleeve 42, and the outer wall surface 423 is located on the outer side of the rubber sleeve 42.

[0072] When the mating flange 2 of the lower connector B is mated with the external mating flange 100 of the air brake device, the arc-shaped spherical surface 411 of the copper skeleton ring 41 of the combined sealing ring 4 of the lower connector B is precisely embedded in the ball socket surface 16 of the fixing ring 12 of the lower connector B and matches the inner wall of the ball socket surface 16. The inner end face 421 of the rubber sleeve 42 of the combined sealing ring 4 of the lower connector B is tightly attached to the outer end face 13 of the fixing ring 12 of the lower connector B, and the inner ring arc surface 33 of the sealing sleeve 3 covers the outer wall surface 423 of the rubber sleeve of the rubber sleeve 42 of the lower connector B. The inner wall of the external mating flange 100 of the air brake device is tightly attached to the outer wall surface 423 of the rubber sleeve of the copper skeleton ring 41 of the combined sealing ring 4 of the lower connector B.

[0073] To further improve the sealing effect of the rubber sleeve 42, an inner ring groove 424 and an outer ring groove 425 are respectively provided on the inner end face 421 and the outer end face 422 of the rubber sleeve 42 of the combined sealing ring 4 of the lower connector B.

[0074] The outer end face of the upper connector A is a plane. Specifically, the connection between the outer end face 13 of the fixing ring 12 of the upper connector A and the inner wall of the frustum-shaped tube 11 is set at a right angle, that is, the outer end face 13 of the fixing ring 12 of the upper connector A is perpendicular to the inner wall of the frustum-shaped tube 11; and the outer end face 13 of the fixing ring 12 of the upper connector A is flush with the end faces of the left hemispherical arcuate part 31 and the right hemispherical arcuate part 32 of the sealing sleeve 3 of the upper connector A and the end face of the mating flange 2 of the upper connector A, so that the outer end face of the upper connector A forms a plane.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An air brake pipe device for railway freight cars, characterized in that, It includes an intermediate pipe (1), and the air inlet and outlet of the intermediate pipe (1) are respectively provided with an upper connector (A) and a lower connector (B). The upper connector (A) is used to connect with the air outlet of a device or pipe that can output air source, and the lower connector (B) is used to connect with the air inlet of an air braking device.

2. The air brake pipe device for railway freight cars according to claim 1, characterized in that, Both the upper connector (A) and the lower connector (B) include a frustum-shaped tube (11), a retaining ring (12), a mating flange (2), and a sealing sleeve (3). The fixing rings (12) of the upper connector (A) and the lower connector (B) are respectively disposed at both ends of the intermediate tube (1), and the outer diameter of the fixing ring (12) is larger than the outer diameter of the intermediate tube (1). The outer diameter of the frustum tube (11) is larger at one end and smaller at the other end, forming a frustum shape. The fixing rings (12) of the upper connector (A) and the lower connector (B) are respectively connected to the intermediate tube (1) through their respective frustum tubes (11). The mating flange (2) of the upper connector (A) is fitted on the outer wall of the corresponding frustum-shaped tube (11), and the mating flange (2) of the upper connector (A) is sealed to the fixing ring (12) by a sealing sleeve (3); the mating flange (2) of the lower connector (B) is fitted on the outer wall of the corresponding frustum-shaped tube (11), and the mating flange (2) of the lower connector (B) is sealed to the fixing ring (12) by a sealing sleeve (3); The air brake device is equipped with an external docking flange (100), and the docking flange (2) of the lower connector (B) is docked with the external docking flange (100) of the air brake device; the device or pipe that can output air source is equipped with an external docking flange (100), and the docking flange (2) of the upper connector (A) is docked with the external docking flange (100) of the device or pipe that can output air source.

3. The air brake pipe device for railway freight cars according to claim 2, characterized in that, The frustum-shaped tube (11) of the upper connector (A) and the frustum-shaped tube (11) of the lower connector (B) have the same inner diameter as the intermediate tube (1), and the fixing ring (12) of the upper connector (A), the frustum-shaped tube (11), the intermediate tube (1), and the frustum-shaped tube (11) and the fixing ring (12) of the lower connector (B) are integrally formed.

4. The air brake pipe device for railway freight cars according to claim 3, characterized in that, The sealing sleeve (3) is a spherical arc splicing sleeve, including a left hemispherical arc part (31) and a right hemispherical arc part (32). The left hemispherical arc part (31) and the right hemispherical arc part (32) are spliced ​​together to form a complete ring to form the sealing sleeve (3). The inner wall of the left hemispherical arc surface (31) and the inner wall of the right hemispherical arc surface (32) together form a complete annular inner arc surface (33), and the edge of the inner arc surface (33) protrudes inward to form an annular flange (34). The mating flanges (2) of the upper connector (A) and the lower connector (B) are provided with spherical arc-shaped holes (20), and the shape of the hole wall of the spherical arc-shaped holes (20) is a spherical arc surface; The fixing ring (12) of the upper connector (A) and the lower connector (B) includes an outer end face (13), an outer wall face (14), and an inner end face (15). The outer wall face (14) is located on the outer side of the fixing ring (12). The outer end face (13) and the inner end face (15) are located at the two ends of the fixing ring (12), and the inner end face (15) is the end face of the fixing ring (12) that is close to the frustum-shaped tube (11). The outer wall surface (14) of the fixing ring of the upper connector (A) and the lower connector (B) protrudes outward to form the inner end face (15) of the fixing ring (12) of the upper connector (A) and the lower connector (B), and a step is formed between the inner end face (15) of the fixing ring and the outer wall of the frustum-shaped tube (11). When the mating flanges (2) of the upper connector (A) and the lower connector (B) are sealed with their respective fixing rings (12) by the sealing sleeve (3), the inner annular arc surface (33) of the sealing sleeve (3) is fitted on the outer wall surface (14) of the fixing ring (12) of the upper connector (A) or the lower connector (B), and the annular flange (34) of the sealing sleeve (3) is precisely engaged on the step formed between the inner end face (15) of the fixing ring of the upper connector (A) or the lower connector (B) and the outer wall of the frustum-shaped tube (11); The spherical arc-shaped hole (20) of the mating flange (2) of the upper connector (A) or the lower connector (B) is fitted onto the outer wall of the sealing sleeve (3).

5. The air brake pipe device for railway freight cars according to claim 4, characterized in that, Bolt holes (21) are provided at both ends of the mating flanges (2) of the upper connector (A) and the lower connector (B). The two bolt holes (21) are located on both sides of the spherical arc hole (20). The two bolt holes (21) are used to insert bolts to connect with the external mating flange (100).

6. The air brake pipe device for railway freight cars according to claim 4, characterized in that, The lower connector (B) is also equipped with a torsion fine-tuning mechanism, which includes an arc-shaped spherical surface (411) and a ball-and-socket surface (16). The lower connector (B) also includes a combined sealing ring (4), which is disposed at the connection between the external docking flange (100) of the air brake device and the docking flange (2) of the lower connector (B). The combined sealing ring (4) includes a copper skeleton ring (41), and the arc-shaped spherical surface (411) is located at the end of the outer wall of the copper skeleton ring (41) of the combined sealing ring (4) of the lower connector (B). The connection between the outer end face (13) of the fixing ring (12) of the lower connector (B) and the inner wall of the frustum-shaped tube (11) is set as a spherical arc surface to form the ball-and-socket surface (16), and the arc-shaped spherical surface (411) is adapted to the ball-and-socket surface (16) of the fixing ring (12) of the lower connector (B). When the mating flange (2) of the lower connector (B) is twisted relative to the external mating flange (100) of the air brake device, the ball-and-socket surface (16) of the retaining ring (12) of the lower connector (B) can slide on the arc-shaped spherical surface (411) at the end of the outer wall of the copper skeleton ring (41) of the combined sealing ring (4).

7. The air brake pipe device for railway freight cars according to claim 6, characterized in that, The combined sealing ring (4) of the lower connector (B) also includes a rubber sleeve (42). The outer wall of the copper skeleton ring (41) of the combined sealing ring (4) of the lower connector (B) includes a cylindrical side surface (412) and an arc-shaped spherical surface (411) of the outer wall of the copper ring. The end face of the copper skeleton ring (41) protrudes outward and is set as the arc-shaped spherical surface (411). The arc-shaped spherical surface (411) is adapted to the ball socket surface (16) of the fixing ring (12) of the lower connector (B). The rubber sleeve (42) is sleeved on the cylindrical side surface (412) of the outer wall of the copper ring of the copper skeleton ring (41). The rubber sleeve (42) of the combined sealing ring (4) of the lower connector (B) includes an inner end face (421), an outer end face (422), and an outer wall face (423). The inner end face (421) and the outer end face (422) are located at the two ends of the rubber sleeve (42), and the outer wall face (423) is located on the outer side of the rubber sleeve (42).

8. The air brake pipe device for railway freight cars according to claim 7, characterized in that, When the mating flange (2) of the lower connector (B) is mated with the external mating flange (100) of the air brake device, the arc-shaped spherical part (411) of the copper skeleton ring (41) of the combined sealing ring (4) of the lower connector (B) is precisely embedded in the ball socket surface (16) of the fixing ring (12) of the lower connector (B) and matches the inner wall of the ball socket surface (16). The rubber sleeve (42) of the combined sealing ring (4) of the lower connector (B) is inside the rubber sleeve. The end face (421) is in close contact with the outer end face (13) of the fixing ring (12) of the lower connector (B), and the inner ring arc surface (33) of the sealing sleeve (3) covers the outer wall surface (423) of the rubber sleeve (42) of the lower connector (B); the inner wall of the external docking flange (100) of the air brake device is in close contact with the outer wall surface (423) of the rubber sleeve of the copper skeleton ring (41) of the combined sealing ring (4) of the lower connector (B).

9. The air brake pipe device for railway freight cars according to claim 8, characterized in that, The rubber sleeve (42) of the combined sealing ring (4) of the lower connector (B) has an inner ring groove (424) and an outer ring groove (425) respectively provided on the inner end face (421) and outer end face (422) of the rubber sleeve (42).

10. The air brake pipe device for railway freight cars according to claim 4, characterized in that, The connection between the outer end face (13) of the fixing ring (12) of the upper connector (A) and the inner wall of the frustum-shaped tube (11) is set at a right angle; and the outer end face (13) of the fixing ring (12) of the upper connector (A) is flush with the end faces of the left hemispherical arc surface (31) and the right hemispherical arc surface (32) of the sealing sleeve (3) of the upper connector (A) and the end face of the mating flange (2) of the upper connector (A), so that the outer end face of the upper connector (A) forms a plane.

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