Sealing ring for flange of railway wagon brake pipe system

Abstract

The sealing ring for the flange of the brake pipe system of railway freight cars in the present invention includes an annular base body. An upper and a lower sealing lip, which are annular and integrally formed with the inner side surface of the annular base body, are provided on the inner side surface of the annular base body. A metal skeleton integrally formed with the annular base body is arranged inside the annular base body. A plurality of positioning bosses integrally formed with the annular base body are further provided on the inner surface of the annular base body. The positioning bosses are located between the upper and lower sealing lips and are circumferentially spaced apart. The inner surfaces of the plurality of positioning bosses are all located on a virtual cylindrical surface, and the diameter of the virtual cylindrical surface is larger than the inner diameters of the upper and lower sealing lips. The sealing ring for the flange of the brake pipe system of railway freight cars in the present invention, through the metal skeleton and the positioning bosses, has better sealing performance, is anti-deformation and can be applicable to the severe cold environment of -60°C, solves the problems of sealing failure or gas leakage existing in the prior art, effectively guarantees the safe operation of the vehicle, and plays an important role in transportation guarantee for the stable operation of the national economy.

Description

Technical Field

[0001] The invention relates to a sealing ring, in particular to a sealing ring for a flange of a brake pipe system of a railway freight car. Background Art

[0002] The flanges and flange connections of the railway freight car brake system all use sealing rings to achieve gas sealing to ensure that the gas pressure drop meets the standard requirements when the vehicle uses gas pressure to brake. The sealing ring is a key product of the service brake system. It is used to prevent the compressed air of the brake pipe system from leaking from the joints of each pipe. It plays a vital role in the braking of railway freight cars. If there is a problem with the sealing ring, it will cause poor sealing of the pipe and serious air leakage at the least, or even cause brake failure, seriously affecting driving safety. At present, the flange sealing rings used in the railway freight car brake pipe system are mainly E-shaped sealing rings, such as Figure 4 As shown, the E-shaped sealing ring 9 includes: a sealing ring body 90, upper and lower sealing lips 91, 91', an air guide groove 93 and upper and lower air-filling sealing grooves 92, 92'. Figure 5 As shown, during installation, first, the E-shaped sealing ring 9 is put on the end face core shaft 810 of the lower flange core 81. Because the inner diameter of the E-shaped sealing ring is smaller than the outer diameter of the end face core shaft 810, the E-shaped sealing ring 9 and the end face core shaft 810 form a tight fit through the elastic effect of the rubber; then, the upper flange core 84 is matched with the end face of the lower flange core 81, and the upper flange 85 located on the outside of the upper flange core 84 and the lower flange 83 located on the outside of the lower flange core 81 are locked by bolts. At this time, the E-shaped sealing ring is pressed by the end faces of the upper flange core 84 and the lower flange core 84, so that the inner cavities of the upper and lower flange cores form a sealed space. During operation, in theory, after the inner cavities of the upper and lower flange cores are inflated, the gas should be able to enter the upper and lower inflation sealing grooves 92, 92' through the air guide groove 93 under the action of air pressure, and the upper and lower sealing lips 91, 91' are squeezed upward and downward respectively under the action of air pressure, thereby increasing the contact force between the upper and lower sealing lips 91 of the E-shaped sealing ring 9 and the end faces of the upper and lower flange cores, so as to further enhance the sealing effect.

[0003] However, in the actual use process, although the material and size of the E-shaped sealing ring meet the physical property indexes and drawing structure size requirements in the industry standards, leakage still occurs, especially in the severe cold regions of Northeast China in winter. During on-site maintenance, the following problems were found: The overall structure of the E-shaped sealing ring has undergone large distortion and deformation. The upper surface of the upper sealing lip 91 cannot be kept on the same horizontal plane, and the lower surface of the lower sealing lip 91' cannot be kept on the same horizontal plane either. This causes the upper and lower sealing lips 91, 91' not to be in close contact with the end face of the flange core to form a good seal; some of the upper and lower sealing lips 91, 91' are firmly adhered to the sealing ring body 90, completely closing the inflatable upper and lower sealing grooves 92, 92', and completely closing the air passage of the sealing ring. During operation, the upper and lower sealing lips 91, 91' cannot be respectively extruded upward and downward under the action of gas and cannot play a role in strengthening the seal.

[0004] The main reasons for the above problems are as follows: The E-shaped sealing ring is made of rubber material. After being used for a period of time, especially in the severe cold environment with a temperature of -50 °C, the ambient temperature is close to the glass transition temperature of the rubber, and the elastic deformation of the rubber after being extruded cannot be restored, resulting in permanent deformation, which causes the E-shaped ring not to be in close contact with the end face of the flange core and leads to leakage problems; in addition, during assembly, since the E-shaped sealing ring is tightly fitted on the end face core shaft 810 of the lower flange core 81, the air guide groove 93 is extruded and undergoes tensile deformation. Under the action of the persistent flange assembly pressure, the upper and lower sealing lips 91, 91' of the E-shaped sealing ring will be firmly adhered to the rubber body, preventing gas from entering the inflatable sealing groove 92 through the air guide groove 93 during operation and unable to play a further role in strengthening the seal.

[0005] In 2019, the number of freight cars in China's entire railway network has exceeded 800,000, playing an important role in ensuring transportation for the stable operation of the national economy. The E-shaped sealing ring is used very frequently, and the current number in use is huge, reaching up to 3 million. Therefore, optimizing and improving the currently used E-shaped sealing ring to overcome the above existing problems will play an important role in ensuring the safe operation of vehicles. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a sealing ring for the brake pipe system flange of railway freight cars with better sealing performance, anti-deformation and applicable to the severe cold environment of -60 °C.

[0007] The sealing ring for the flange of the brake pipe system of railway freight cars of the present invention includes an annular base body. An annular upper and lower sealing lips, which are integrally formed with the annular base body, are provided on the inner side surface of the annular base body. A metal skeleton integrally formed with the annular base body is provided inside the annular base body. A plurality of positioning bosses integrally formed with the annular base body are further provided on the inner surface of the annular base body. The positioning bosses are located between the upper and lower sealing lips and are circumferentially spaced apart. The inner surfaces of the plurality of positioning bosses are all located on a virtual cylindrical surface, and the diameter of the virtual cylindrical surface is larger than the inner diameters of the upper and lower sealing lips.

[0008] For the sealing ring for the flange of the brake pipe system of railway freight cars of the present invention, the upper sealing lip protrudes inward and upward from the inner surface of the annular base body, and the lower sealing lip protrudes inward and downward from the inner surface of the annular base body.

[0009] For the sealing ring for the flange of the brake pipe system of railway freight cars of the present invention, annular upper and lower auxiliary lips integrally formed therewith are respectively provided on the upper and lower end surfaces of the annular base body. The heights by which the upper and lower auxiliary lips protrude from the upper and lower end surfaces of the annular base body are respectively smaller than the heights by which the upper and lower sealing lips protrude from the upper and lower end surfaces of the annular base body.

[0010] For the sealing ring for the flange of the brake pipe system of railway freight cars of the present invention, the angles between the upper and lower sealing lips and the horizontal plane are both greater than or equal to 35° and less than or equal to 55°.

[0011] For the sealing ring for the flange of the brake pipe system of railway freight cars of the present invention, the thicknesses of the upper and lower sealing lips are both greater than or equal to 1.5 mm and less than or equal to 4.5 mm.

[0012] For the sealing ring for the flange of the brake pipe system of railway freight cars of the present invention, the angles between the upper and lower sealing lips and the horizontal plane are both 45°.

[0013] For the sealing ring for the flange of the brake pipe system of railway freight cars of the present invention, the thicknesses of the upper and lower sealing lips are both 3 mm.

[0014] For the sealing ring for the flange of the brake pipe system of railway freight cars of the present invention, the metal skeleton is an annular body.

[0015] For the sealing ring for the flange of the brake pipe system of railway freight cars of the present invention, there are four positioning bosses, which are equally spaced along the circumference.

[0016] The sealing ring for the flange of the brake pipe system of railway freight cars in the present invention has a metal skeleton integrally formed in the annular base body, which increases the overall strength of the sealing ring, enabling the sealing ring to have obvious anti-deformation and anti-destruction capabilities as a whole. The composite structure of elastic rubber and rigid metal skeleton, while ensuring that the elastic part plays a sealing performance, the rigid metal skeleton part effectively reduces the adverse impact of the compression permanent deformation of the overall sealing ring structure on the sealing effect, so that the sealing ring is not easily deformed during assembly and use. Especially in cold weather, it can prevent the sealing failure problem caused by large deformation of the sealing ring, increasing the service life of the sealing ring, and at the same time effectively reducing the requirements for the compression cold resistance performance of the material, which can effectively reduce production costs; through the positioning bosses distributed at intervals, it is ensured that when the sealing ring is installed at various angles, the effect of coaxial centering installation can be achieved, and at the same time it can ensure that there is an effective air inflation channel in the sealing ring, so that the gas in the pipeline can smoothly flow into the sealing ring channel. The upper and lower sealing lips are respectively extruded upward and downward under the action of the gas and closely cooperate with the upper and lower flange core end faces, thereby playing an active sealing role and further enhancing the sealing effect. The sealing ring for the flange of the brake pipe system of railway freight cars in the present invention has better sealing performance, anti-deformation and can be used in a severe cold environment of -60°C, solving the problems of sealing failure or gas leakage existing in the prior art, effectively ensuring the safe operation of the vehicle, and playing an important role in transportation guarantee for the stable operation of the national economy.

[0017] The following further describes the sealing ring for the flange of the brake pipe system of railway freight cars in the present invention with reference to the accompanying drawings. Description of the Drawings

[0018] Figure 1 is the top view of the sealing ring for the flange of the brake pipe system of railway freight cars in the present invention;

[0019] Figure 2 is Figure 1 the A-A cross-sectional view of

[0020] Figure 3 is the usage state diagram of the sealing ring for the flange of the brake pipe system of railway freight cars in the present invention;

[0021] Figure 4 is the front view of the existing E-shaped sealing ring;

[0022] Figure 5 is the usage state diagram of the existing E-shaped sealing ring. Detailed Embodiments

[0023] As Figure 1 and Figure 2As shown in the figure, the sealing ring for the flange of the railway freight car brake pipe system of the present invention includes an annular base body 1 and a metal skeleton 2. The metal skeleton 2 is located inside the annular base body 1 and is integrally vulcanized with the annular base body 1 through an adhesive. The metal skeleton 2 is an annular body, and its cross-section is rectangular. The metal skeleton 2 increases the overall strength of the sealing ring, making the sealing ring have obvious anti-deformation and anti-destruction capabilities as a whole; the composite structure of elastic rubber and rigid skeleton, while ensuring that the elastic part plays a sealing performance, the rigid skeleton part effectively reduces the adverse impact of the compression set of the overall sealing ring structure on the sealing effect. Therefore, by arranging the metal skeleton 2 inside the sealing ring, the sealing ring is not easily deformed during assembly and use. Especially in cold weather, it can prevent the problem of sealing failure caused by large deformation of the sealing ring, increasing the service life of the sealing ring. At the same time, it also effectively reduces the requirements for the compression cold resistance performance of the material, and can effectively reduce the production cost. The inner surface of the annular base body 1 is provided with an annular upper sealing lip 11 and a lower sealing lip 11'. The upper and lower sealing lips 11, 11' are respectively located at the upper and lower ends of the inner surface of the annular base body 1. The upper sealing lip 11 protrudes inward and upward from the inner surface of the annular base body 1, and the lower sealing lip 11' protrudes inward and downward from the inner surface of the annular base body 1. The included angle range between the upper and lower sealing lips 11, 11' and the horizontal plane is determined according to specific designs and on-site use environments, and its preferred range is: greater than or equal to 35° and less than or equal to 55°. In this embodiment, the included angles between the upper and lower sealing lips 11, 11' and the horizontal plane are both 45°. The thicknesses of the upper and lower sealing lips 11, 11' are also determined according to specific designs and on-site use environments, and its preferred range is: greater than or equal to 1.5 mm and less than or equal to 4.5 mm. In this embodiment, the thicknesses of the upper and lower sealing lips 11, 11' are both 3 mm. The structure of the thickened lip of the upper and lower sealing lips 11, 11' not only strengthens the pre-tightening force generated at the lip and the flange joint surface in the compressed state, enhancing the reliability of the sealing effect, but also is beneficial to maintaining the stability of the sealing structure of the lip during long-term use.

[0024] On the inner surface of the annular base body 1, four positioning bosses 12 protruding inward are provided. The positioning bosses 12 are located between the upper sealing lip 11 and the lower sealing lip 11'. The four positioning bosses 12 are evenly distributed along the circumferential direction at equal intervals. The inner surfaces of the four positioning bosses 12 are all located on a virtual cylindrical surface, and the diameter of this virtual cylindrical surface is smaller than the minimum inner diameter of the upper sealing lip 11 and the lower sealing lip 11'. As Figure 3 shown, this can ensure that when the sealing ring of the present invention is sleeved on the end face mandrel 210 of the flange core 21 (see Figure 3) The four positioning bosses 12 can be in close contact with the end face mandrel 210 to play an effective positioning and centering role. At the same time, neither the upper sealing lip 11 nor the lower sealing lip 11' contacts the end face mandrel 210. The number of the positioning bosses 12 can be adjusted accordingly according to the size of the sealing ring and the actual use environment. For example, it can be 3, 5, 6, etc. In addition, an upwardly protruding annular upper auxiliary lip 13 is provided on the upper end face of the annular base 1, and the height of the upper auxiliary lip 13 protruding from the upper end face of the annular base body 1 is less than the height of the upper sealing lip 11 protruding from the upper end face of the annular base body 1; a downwardly protruding annular lower auxiliary lip 13' is provided on the lower end face of the annular base 1, and the height of the lower auxiliary lip 13' protruding from the upper end face of the annular base body 1 is less than the height of the lower sealing lip 11' protruding from the lower end face of the annular base body 1. The annular base 1 is made of rubber material, and the upper and lower sealing lips 11, 11', the positioning bosses 12 and the upper and lower auxiliary lips 13, 13' are all made of rubber material and are integrally formed with the annular base 1.

[0025] When the sealing ring for the flange of the brake pipe system of the railway freight car of the present invention is in use, such as Figure 3As shown in the figure, first, the sealing ring is sleeved on the end face mandrel 210 of the lower flange core 21 of the lower flange 23. The inner surface of the positioning boss 12 forms an interference fit with the end face mandrel 210, so that the sealing ring is fixed on the end face mandrel 210, ensuring that the sealing ring can achieve the effect of coaxial centering installation at various installation angles. At this time, the upper and lower sealing lips 11, 11' do not contact the end face mandrel 210, which can effectively avoid damage such as pinching of the upper and lower sealing lips 11, 11' during assembly. At the same time, the positioning bosses 12 are distributed at intervals to ensure that there is an effective air inflation channel inside the sealing ring, so that the gas in the pipeline can smoothly flow into the sealing ring channel. Then, the upper flange 25 and the lower flange 23 are pre-tightened and connected by bolts. At this time, the end face of the upper flange core 24 presses on the end face of the lower flange core 21, the upper sealing lip 11 and the upper auxiliary lip 13 of the sealing ring. Under the action of the bolt pre-tightening force, the end face of the upper flange core 24 forms a tight fit with the upper sealing lip 11, and the end face of the lower flange core 21 forms a tight fit with the lower sealing lip 11', thus forming a closed sealing space. The upper and lower sealing lips 11, 11' can effectively compensate for and fill the rough and uneven parts of the flange contact surface through strong deformation, so as to achieve the sealing effect. During operation, gas enters the cavity formed by the upper and lower sealing lips 11, 11' of the sealing ring from the flange core cavity, so that the upper and lower sealing lips 11, 11' respectively press the end faces of the upper and lower flange cores 24, 21 upward and downward under the gas pressure, thereby playing an active sealing role and further enhancing the sealing effect. The design of the upper and lower sealing lips 11, 11' and the positioning boss 12 of the sealing ring of the present invention effectively ensures that the air duct inside the sealing ring remains unobstructed, and there will be no phenomenon that the upper and lower sealing lips are adhered to the annular matrix and block the air duct. The metal skeleton 2 inside the sealing ring effectively increases the strength of the sealing ring, makes its structural form more stable, and avoids phenomena such as torsion, overall or local deformation, and lip turning of the sealing ring during assembly or use, ensuring the stability of the sealing ring during use. Especially in cold weather, it can prevent the sealing failure problem caused by large deformation of the sealing ring, increasing the service life of the sealing ring; at the same time, it also effectively reduces the requirements for the compression and cold resistance performance of the material, and can effectively reduce the production cost; the metal skeleton 2 and the upper and lower sealing lips 11, 11' are integrally formed. After the sealing ring is installed in place, due to the supporting effect of the metal skeleton 2, the pre-tightening force of the upper and lower sealing lips 11, 11' in contact with the end faces of the upper and lower flange cores 24, 21 is greater than that of the existing E-shaped sealing ring, thereby further improving the sealing performance. The upper and lower auxiliary lips 13, 13' serve as the auxiliary sealing structure of the sealing ring, which can not only play a role in stabilizing the overall structure during the pre-pressing assembly of the sealing ring, but also play a sealing compensation role when the upper and lower sealing lips 11, 11' fail to seal.

[0026] The sealing ring for the flange of the brake pipe system of railway freight cars of the present invention was tested at the low-temperature test station of the Quality and Technical Supervision Institute of China Railway Harbin Bureau Group Co., Ltd. according to TB / T 2206-2018 "Rubber Parts for Railway Freight Car Brake Systems" and Q / CR 706-2019 "Type E Sealing Rings for Flanges of Railway Freight Car Brake Pipe Systems". The test items and test results are shown in the following figure:

[0027]

[0028] From the above experimental data, it can be seen that all technical performances of the sealing ring for the flange of the brake pipe system of railway freight cars of the present invention meet the requirements of industry standards.

[0029] The sealing ring for the flange of the brake pipe system of railway freight cars of the present invention reduces the production cost, has better sealing performance, is resistant to deformation and can be applied to the severe cold environment of -60°C. It solves the problems of seal failure or gas leakage existing in the prior art, effectively guarantees the safe operation of vehicles, and plays an important role in ensuring transportation for the stable operation of the national economy.

[0030] The above embodiments are only used to describe the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A sealing ring for a flange of a railway freight car brake pipe system, comprising an annular base body (1). An annular upper and lower sealing lip (11, 11') which is integrally formed with the annular base body (1) is arranged on the inner side surface of the annular base body (1). It is characterized in that: A metal skeleton (2) integrally formed with the annular base body (1) is provided inside the annular base body (1). The inner surface of the annular base body (1) is further provided with a plurality of positioning bosses (12) integrally formed therewith. The positioning bosses (12) are located between the upper and lower sealing lips (11, 11') and are circumferentially spaced apart. The inner surfaces of the plurality of positioning bosses (12) are all located on a virtual cylindrical surface, and the diameter of the virtual cylindrical surface is smaller than the inner diameters of the upper and lower sealing lips (11, 11') to prevent the upper and lower sealing lips (11, 11') from adhering to the annular base body (1). When the sealing ring is in use, first, the sealing ring is sleeved on the end face core shaft (210) of the lower flange core (21) of the lower flange (23). The inner surface of the positioning boss (12) forms an interference fit with the end face core shaft (210) so that the sealing ring is fixed on the end face core shaft (210), and the upper sealing lip (11) and the lower sealing lip (11') do not contact the end face core shaft (210). The upper sealing lip (11) protrudes inward and upward from the inner surface of the annular base body (1), and the lower sealing lip (11') protrudes inward and downward from the inner surface of the annular base body (1). The upper sealing lip (11) and the lower sealing lip (11') are of a structure with thickened lips. The thicknesses of the upper and lower sealing lips (11, 11') are both greater than or equal to 1.5 mm and less than or equal to 4.5 mm. The upper and lower sealing lips (11, 11') are arranged such that after the upper flange (25) and the lower flange (23) are pre-tightened and connected by bolts, the end face of the upper flange core (24) presses on the end face of the lower flange core (21) and the upper sealing lip (11) of the sealing ring. A closed sealing space is formed between the upper sealing lip (11) and the lower sealing lip (11'). At the same time, the upper and lower sealing lips (11, 11') undergo strong deformation to increase the pre-tightening force between them and the end faces of the upper flange core (24) and the lower flange core (21), and at the same time compensate for and fill the roughness of the end faces of the upper flange core (24) and the lower flange core (21), thereby achieving strong sealing.

2. The sealing ring for a flange of a railway freight car brake pipe system according to claim 1, characterized in that: Annular upper and lower auxiliary lips (13, 13') integrally formed with the annular base body (1) are respectively provided on the upper and lower end faces of the annular base body (1). The heights by which the upper and lower auxiliary lips (13, 13') protrude from the upper and lower end faces of the annular base body (1) are respectively smaller than the heights by which the upper and lower sealing lips (11, 11') protrude from the upper and lower end faces of the annular base body (1).

3. The sealing ring for a flange of a railway freight car brake pipe system according to any one of claims 1 - 2, characterized in that: The angles between the upper and lower sealing lips (11, 11') and the horizontal plane are both greater than or equal to 35° and less than or equal to 55°.

4. The sealing ring for a flange of a railway freight car brake pipe system according to claim 3, characterized in that: The angles between the upper and lower sealing lips (11, 11') and the horizontal plane are both 45°.

5. The sealing ring for a flange of a railway freight car brake pipe system according to claim 4, characterized in that: The thicknesses of the upper and lower sealing lips (11, 11') are both 3 mm.

6. The sealing ring for a flange of a railway freight car brake pipe system according to claim 5, characterized in that: The metal skeleton (2) is an annular body.

7. The sealing ring for a flange of a railway freight car brake pipe system according to claim 6, characterized in that: There are four positioning bosses (12), and they are equally spaced along the circumferential direction.

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