Corrugated diaphragm plate for wagon control valve

Abstract

A corrugated diaphragm plate for a control valve of a railway wagon comprises a middle corrugated part (1), an upper sealing rib (2) and a lower sealing rib (3), the middle corrugated part (1) is connected with the upper sealing rib (2) and the lower sealing rib (3), the upper sealing rib (2) and the lower sealing rib (3) are round, the round top end of the upper sealing rib (2) is tangent to the largest outer edge of one end of the middle corrugated part (1), and the round top end of the lower sealing rib (3) is tangent to the largest outer edge of the other end of the middle corrugated part (1). The upper sealing rib (2) is in smooth transition connection with the upper end of the middle corrugated part (1); the circular top end of the lower sealing rib (3) is tangent to the smallest inner edge of the other end of the middle corrugated part (1), and the lower sealing rib (3) is in smooth transition connection with the lower end of the middle corrugated part (1). The utility model aims to provide the corrugated diaphragm plate for the wagon control valve with the long fatigue life, which has the advantages of simple structure, low cost, safety, reliability, strong deformability, long service life and the like.

Description

Technical Field

[0001] This utility model relates to the field of rubber sealing technology, and specifically to a corrugated diaphragm plate for a railway freight car control valve. Background Technology

[0002] my country's railway locomotives and rolling stock all use air brakes, which control the train's operation by varying the pressure of compressed air within the brake pipes. The Type 120 control valve relies on the pressure difference between the upper and lower surfaces of its diaphragm to create vertical movement, thus controlling the brakes to achieve vehicle braking. my country's railway freight cars operate in environments with significant temperature differences between north and south, requiring trains to function normally in temperatures ranging from -50℃ to 70℃. Some lines also face thawing conditions during winter, needing to withstand 110℃ temperatures for 3 hours frequently. Existing control valve diaphragms are primarily made of natural rubber, which presents certain problems in practical applications. These problems include: poor oil resistance and aging resistance, making them prone to cracking and perforation; and weak tensile and tear strength, leading to fatigue perforation. All of these factors can cause brake failure and compromise train safety.

[0003] The function of the 120-type air control valve / release valve is to manually release the pressurized air from the brake cylinder, thus releasing the brake. The release valve and diaphragm are as follows: Figure 1 As shown, the diaphragm has an inverted V-shape. When the release handle is pulled, air is inflated below the diaphragm, and the diaphragm drives the release piston rod to compress the release valve spring, thus producing a release action. At this time, the release valve diaphragm is subjected to a large tensile force in the radial direction. Therefore, stress concentration is prone to occur at the contact point between the diaphragm and the release piston, eventually leading to diaphragm perforation and rupture in this area, causing the release valve to fail. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention proposes a corrugated diaphragm plate for railway freight car control valve.

[0005] A corrugated diaphragm for a railway freight car control valve includes a central corrugated portion, an upper sealing rib, and a lower sealing rib. The central corrugated portion connects the upper and lower sealing ribs, which are circular. The circular top of the upper sealing rib is tangent to the maximum outer edge of one end of the central corrugated portion, and the upper sealing rib smoothly transitions to the upper end of the central corrugated portion. The circular top of the lower sealing rib is tangent to the minimum inner edge of the other end of the central corrugated portion, and the lower sealing rib smoothly transitions to the lower end of the central corrugated portion.

[0006] In the middle corrugated section, the first arc is tangent to the tangent of the top circle of the upper sealing rib, the second arc corresponds to the first arc, the third arc smoothly transitions to the first arc, the fourth arc corresponds to the third arc, the rear arcs of the third and fourth arcs smoothly transition to the third and fourth arcs respectively and connect to the fifth arc, the fifth arc is tangent to the tangent of the top circle of the lower sealing rib, and the sixth arc corresponds to the fifth arc.

[0007] Optionally, the diameter of the upper and lower sealing ribs of the corrugated diaphragm is 3mm to 6mm.

[0008] Optionally, the diameter of the arc in the intermediate corrugated portion is 0.1 mm to 10 mm.

[0009] Optionally, the corrugation center angle of the intermediate corrugated portion is 45° to 135°.

[0010] Optionally, the corrugated structure of the intermediate corrugated portion has the same radius of curvature.

[0011] Optionally, the corrugated structure of the intermediate corrugated portion has different radii of curvature.

[0012] The materials of the middle corrugated portion, the upper sealing rib, and the lower sealing rib are one or more of nitrile rubber, hydrogenated nitrile rubber, chloroprene rubber, and natural rubber.

[0013] The purpose of this invention is to provide a corrugated diaphragm for railway freight car control valves that can improve the reliability of the manual release function of existing Type 120 air control valves and their derivatives, and extend the service life of the diaphragm.

[0014] This utility model provides a corrugated diaphragm for a railway freight car control valve, comprising a middle corrugated section, an upper sealing rib, and a lower sealing rib. The corrugated structure of the middle corrugated section can effectively reduce the radial tensile force of the diaphragm, change the structure of the contact surface between the diaphragm and the upper piston, improve the stress concentration at the contact position between the diaphragm and the upper piston, extend the service life of the relief valve diaphragm, and improve the reliability of the manual relief function of the 120-type air control valve. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a corrugated diaphragm plate structure for a railway freight car control valve.

[0016] Figure 2 This is an assembly drawing of an existing piston diaphragm plate. Detailed Implementation

[0017] The following is a detailed description of a corrugated diaphragm plate for a railway freight car control valve provided by this utility model, with reference to the accompanying drawings and specific embodiments.

[0018] Appendix Figure 1 As shown, a corrugated diaphragm for a railway freight car control valve includes a central corrugated portion 1, an upper sealing rib 2, and a lower sealing rib 3. The central corrugated portion 1 connects the upper sealing rib 2 and the lower sealing rib 3. The upper sealing rib 2 and the lower sealing rib 3 are circular. The circular top end of the upper sealing rib 2 is tangent to the maximum outer edge of one end of the central corrugated portion 1, and the upper sealing rib 2 is smoothly connected to the upper end of the central corrugated portion 1. The circular top end of the lower sealing rib 3 is tangent to the minimum inner edge of the other end of the central corrugated portion 1, and the lower sealing rib 3 is smoothly connected to the lower end of the central corrugated portion 1.

[0019] In the intermediate corrugated portion 1, the first arc 11 is tangent to the tangent of the top circle of the upper sealing rib 2, the second arc 12 corresponds to the first arc 11, the third arc 13 smoothly transitions to the first arc 11, the fourth arc 14 corresponds to the third arc 13, the rear arcs of the third arc 13 and the fourth arc 14 smoothly transition to the third arc 13 and the fourth arc 14 in sequence and connect to the fifth arc 15, the fifth arc 15 is tangent to the tangent of the top circle of the lower sealing rib 3, and the sixth arc 16 corresponds to the fifth arc 15.

[0020] The diameters of the upper sealing rib 2 and the lower sealing rib 3 of the corrugated membrane plate are 3mm to 6mm.

[0021] The diameter of the arc in the intermediate corrugated portion 1 is 0.1mm to 10mm.

[0022] The corrugated center angle of the intermediate corrugated portion 1 is 45° to 135°.

[0023] The corrugated structure of the intermediate corrugated portion 1 has the same radius of curvature.

[0024] The corrugated structure of the intermediate corrugated portion 1 has different radii of curvature.

[0025] The materials of the intermediate corrugated portion 1, the upper sealing rib 2, and the lower sealing rib 3 are one or more of nitrile rubber, hydrogenated nitrile rubber, chloroprene rubber, and natural rubber.

[0026] Compared to Figure 2 The existing brake valve diaphragm shown in this invention features a corrugated diaphragm structure. This includes an S-shaped folded corrugated structure formed entirely between the upper and lower sealing ribs of the diaphragm. The corrugated portion in the middle of the diaphragm smoothly transitions and connects to the upper and lower sealing ribs. This effectively enhances the diaphragm's resistance to flexural fatigue, improves its deformation resistance, and ensures the reliability of manual release and the safety of train operation. The purpose of this invention is to provide a high-fatigue-life corrugated diaphragm for railway freight car control valves, which has advantages such as simple structure, low cost, safety and reliability, strong deformation capacity, and long service life.

[0027] The diaphragm plate designed according to the structure of this invention constitutes a simple, low-cost, safe, reliable, highly deformable, and long-service-life control valve corrugated diaphragm plate. This rubber corrugated diaphragm plate is made of neoprene rubber. Compared to existing control valve rubber diaphragms, this invention, by adopting a structure including a central corrugated section, upper sealing ribs, and lower sealing ribs, not only effectively reduces the radial tensile force of the diaphragm plate but also changes the structure of the contact surface between the diaphragm plate and the upper piston, improving stress concentration at the contact point and extending the service life of the relief valve diaphragm plate. Simultaneously, by using a diaphragm plate made of neoprene rubber, this invention effectively enhances oil resistance, aging resistance, and flexural fatigue resistance, improves tensile and tear strength and deformation capacity, ensuring the reliability of manual relief and driving safety.

[0028] The results of the cyclic test and practical application of the rubber diaphragm plate show that the corrugated diaphragm plate for railway freight car control valve of this invention has the following beneficial effects: by adopting a structure including a middle corrugated part, an upper sealing rib and a lower sealing rib, the stability and deformation capacity of the diaphragm plate structure are enhanced, solving the problem that existing diaphragms are easily damaged during tensile deformation; by using neoprene rubber to make the rubber diaphragm plate, the problems of existing diaphragms being not oil-resistant, not aging-resistant, and not resistant to flexural fatigue are solved, and the strength and resistance to flexural cracking are improved.

[0029] Finally, it should be noted that the above embodiments are only used to describe the technical solutions of the present invention and not to limit the technical methods. The present invention can be extended to other modifications, variations, applications and embodiments, and therefore all such modifications, variations, applications and embodiments are considered to be within the spirit and teachings of the present invention.

Claims

1. A corrugated diaphragm plate for a railway freight car control valve, comprising a central corrugated portion (1), an upper sealing rib (2), and a lower sealing rib (3), wherein the central corrugated portion (1) connects the upper sealing rib (2) and the lower sealing rib (3), characterized in that, The upper sealing rib (2) and the lower sealing rib (3) are circular. The top of the circular upper sealing rib (2) is tangent to the outermost edge of one end of the middle corrugated part (1), and the upper sealing rib (2) is smoothly connected to the upper end of the middle corrugated part (1). The top of the circular lower sealing rib (3) is tangent to the innermost edge of the other end of the middle corrugated part (1), and the lower sealing rib (3) is smoothly connected to the lower end of the middle corrugated part (1).

2. The corrugated diaphragm plate for a railway freight car control valve according to claim 1, characterized in that, In the middle corrugated part (1), the first arc (11) is tangent to the tangent of the top circle of the upper sealing rib (2), the second arc (12) corresponds to the first arc (11), the third arc (13) is smoothly connected to the first arc (11), the fourth arc (14) corresponds to the third arc (13), the rear arcs of the third arc (13) and the fourth arc (14) are smoothly connected to the third arc (13) and the fourth arc (14) and connected to the fifth arc (15), the fifth arc (15) is tangent to the tangent of the top circle of the lower sealing rib (3), and the sixth arc (16) corresponds to the fifth arc (15).

3. The corrugated diaphragm plate for a railway freight car control valve according to claim 1, characterized in that, The diameter of the upper sealing rib (2) and lower sealing rib (3) of the corrugated diaphragm is 3mm to 6mm.

4. A corrugated diaphragm plate for a railway freight car control valve according to claim 2, characterized in that, The corrugated diaphragm plate for railway freight car control valve according to claim 2 in the intermediate corrugated part (1) has a corrugated diameter of 0.1 mm to 10 mm.

5. A corrugated diaphragm plate for a railway freight car control valve according to claim 2, characterized in that, The corrugated center angle of the intermediate corrugated portion (1) is 45° to 135°.

6. A corrugated diaphragm plate for a railway freight car control valve according to claim 2, characterized in that, The corrugated structure of the intermediate corrugated portion (1) has the same radius of curvature.

7. A corrugated diaphragm plate for a railway freight car control valve according to claim 2, characterized in that, The corrugated structure of the intermediate corrugated part (1) has different radii of curvature.

8. A corrugated diaphragm plate for a railway freight car control valve according to claim 1, characterized in that, The materials of the middle corrugated part (1), the upper sealing rib (2) and the lower sealing rib (3) are one or more of nitrile rubber, hydrogenated nitrile rubber, chloroprene rubber and natural rubber.

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