Brake cylinder protection assembly

Abstract

This invention relates to a brake cylinder protection assembly, comprising a safety valve and a vent valve, mounted on the outer shell of the brake cylinder body. The safety valve includes a valve core with a central hole, a through hole on the side wall of the valve core communicating with the central hole, a support ring mounting portion on the outer surface of the valve core between the through holes, a support ring and a dustproof ring fitted onto the support ring and placed inside a protective sleeve, the valve core extending out of the protective sleeve and fixed by a spacer ring, the openings of the protective sleeves being perpendicular to each other. The vent valve includes a vent valve body, the small end connected to the cylinder body shell, the large end housing a sealing valve core and a positioning ring, the positioning ring having a vent hole, and a rubber protective sleeve covering the vent valve body. This invention solves the problem of moisture entering the brake cylinder and causing seal leakage under extreme weather conditions, ensuring the normal operation of the train.

Description

Technical Field

[0001] This invention belongs to the field of rail transit technology, and in particular relates to a brake cylinder protection component. Background Technology

[0002] The unit brake cylinder is the core component of the basic braking device of rail locomotives and vehicles. It is usually composed of components such as piston sealing mechanism, clearance adjustment mechanism, release spring, piston rod, and cylinder body.

[0003] In the prior art, see Figure 1b The unit brake cylinder uses compressed air as its working medium. When compressed air enters its piston sealing chamber, the spring compression is relieved, and the piston and piston rod extend. When compressed air is discharged from the piston sealing chamber, the piston and piston rod retract under the force of the spring. During the process of compressed air entering or leaving the unit brake cylinder's piston sealing chamber, the volumes of both the piston sealing chamber 5 and the non-piston sealing chamber change accordingly. To maintain the balance between the non-sealed chamber 4 and the external atmospheric pressure, a bidirectional water-permeable and air-permeable labyrinth-type breather is installed at the bottom of the non-piston sealing chamber of the unit brake cylinder. The breather is equipped with a rubber protective cover.

[0004] However, in the process of implementing the inventive technical solution in the embodiments of this application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems:

[0005] All breathers are of a straight-through structure, allowing for bidirectional water and air permeability between the atmosphere and the non-piston-sealed cavity of the unit brake cylinder. In extremely rare, short-duration heavy freezing rain, blizzards, heavy snow, sleet, and other severe weather conditions, and the resulting snow, ice, and water accumulation along the track, the airflow field under the locomotive and rolling stock is complex during high-speed operation. Ice, snow, and water stirred up by the high-speed airflow cover and envelop the unit brake cylinder and breather surface on the bogie of the railcar, passively subjecting the breather to water, snow, and ice. When the unit brake cylinder is released, the non-piston-sealed cavity... The negative pressure in the piston sealing chamber can draw external moisture into the unit brake cylinder. A small amount of water may even fall onto the piston wall. When the ambient temperature drops below 0°C, the water inlet and outlet holes of the breather become blocked by ice due to water immersion. The moisture drawn into the unit brake cylinder cannot be discharged through the blocked holes and freezes into ice crystals at low temperatures, which adhere to the piston wall. The ice crystals may damage the sealing interface and cause leakage in the unit brake cylinder seal. Severe leakage in the unit brake cylinder seal may cause a drop in pressure in the auxiliary air cylinder or even the train pipe, affecting the normal operation of the train. Summary of the Invention

[0006] To address the shortcomings of existing technologies and solve the problem of seal leakage caused by moisture entering the brake cylinder under extreme weather conditions, this invention provides a brake cylinder protection component.

[0007] In one possible embodiment, a brake cylinder protection assembly is provided, comprising: a safety valve and a vent valve, mounted on the brake cylinder body housing; wherein the safety valve comprises: a safety valve core having a central hole extending through its length, and two through holes communicating with the central hole of the valve core on its side wall, with a raised support ring mounting portion on the outer surface of the safety valve core between the two through holes; a support ring, fitted onto the support ring mounting portion and positioned between the two through holes; two dust rings, fitted onto the safety valve core and positioned on both sides of the support ring; and a waterproof vent valve, one end of which is connected to the safety valve core, and the other end of which is provided with a filter membrane and a breathable layer; the mounting support ring of the safety valve core, the waterproof vent valve, and one end of the two dust rings are all placed inside a safety valve protective sleeve. A spacer ring is installed between the end of the safety valve core extending outside the safety valve protective sleeve and the safety valve protective sleeve; the opening of the safety valve protective sleeve at the end not connected to the spacer ring is perpendicular to the opening at the end connected to the spacer ring; the vent valve includes: a vent valve body, the small end of which is connected to the outer shell of the brake cylinder body; a sealing valve core, which is placed inside the large end of the vent valve body, the sealing valve core having a protruding lip, the lip being able to open unidirectionally under the action of airflow flowing from the small end to the large end of the vent valve body, and closing in the state of reverse airflow or no airflow; a positioning ring is placed inside the large end of the vent valve body to press against the sealing valve core, the positioning ring having a vent hole forming an air passage with the lip; the large end of the vent valve body is placed inside a rubber protective sleeve, the other end of which is connected to the atmosphere.

[0008] In one possible implementation, the safety valve's spacer ring is fastened to the outside of the safety valve's protective sleeve using nylon cable ties.

[0009] In one possible implementation, the spacer ring and the safety valve protective sleeve have mating grooves and protrusions.

[0010] In one possible implementation, the cross-section of the support ring is a polygon comprising a short side and an opposite long side, with the face containing the short side in contact with the support ring mounting portion.

[0011] In one possible implementation, a retaining ring for a hole is provided between the positioning ring and the inwardly protruding edge of the large end of the vent valve body, pressing against the outer periphery of the positioning ring.

[0012] In one possible implementation, the outer periphery of the connection between the large end of the vent valve body and the rubber protective sleeve is secured with cable ties.

[0013] In one possible implementation, the aperture of the end of the rubber protective sleeve that opens to the atmosphere is smaller than the aperture of the end that is fitted onto the body of the vent valve.

[0014] Based on the above technical solution, the brake cylinder protection assembly of the present invention features a vent valve whose sealing valve core lip automatically opens under positive pressure to discharge internal gas, and simultaneously closes tightly under negative pressure to prevent external moisture from entering; the safety valve's waterproof vent valve allows for bidirectional ventilation and isolates external moisture through a protective structure; under extreme weather conditions, it avoids sealing leakage caused by moisture entering and freezing, thereby significantly improving the reliability and service life of the brake cylinder and ensuring the safe operation of locomotives and rolling stock. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0016] Figure 1a This is a schematic diagram of the brake cylinder protection assembly and the brake cylinder installation position according to one embodiment of the present invention;

[0017] Figure 1b This is a cross-sectional view of the installation of the vent valve and brake cylinder according to another embodiment of the present invention;

[0018] Figure 1c This is a schematic diagram of a safety valve structure according to another embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the assembly structure of a brake cylinder protection component according to one embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the safety valve installation.

[0021] Figure 4 This is a schematic diagram of the vent valve structure;

[0022] Figure 5 Schematic diagram of the sealing valve core lip;

[0023] Figure 6 This is a schematic diagram of the vent hole for the positioning ring;

[0024] Figure 7 This is a schematic diagram of the vent valve installation.

[0025] Figure 8 This is the exhaust route for the vent valve during braking;

[0026] Figure 9 This is the exhaust route for the safety valve during braking;

[0027] Figure 10 To alleviate the air intake path of the process vent valve;

[0028] Figure 11 To alleviate the air intake path of the process safety valve.

[0029] In the picture:

[0030] 1. Brake cylinder; 2. Safety valve; 2.1 Safety valve core; 2.2 Spacer ring; 2.3 Safety valve protective sleeve; 2.4 Nylon cable tie; 2.5 Dustproof ring; 2.6 Support ring; 2.7 Waterproof vent valve; 2.8 Through hole; 2.9 Center hole; 2.10 Support ring mounting part; 2.11 Filter membrane; 2.12 Breathable layer; 3. Vent valve; 3.1 Vent valve body; 3.2 Sealing valve core; 3.21 Lip; 3.3 Positioning ring; 3.31 Vent hole; 3.4 Hole retaining ring; 3.5 Rubber protective sleeve; 3.6 Cable tie; 3.11 Edge; 4. Non-sealed cavity; 5. Sealed cavity. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] To address the problem of seal leakage caused by moisture entering the brake cylinder under extreme weather conditions in existing technologies, this invention provides a brake cylinder protection component.

[0036] See Figure 1a , Figure 1c , Figure 2 and Figure 3-7 In one possible implementation, a safety valve 2 and a vent valve 3 are mounted on the cylinder body housing of the brake cylinder 1. The safety valve 2 includes a safety valve core 2.1 with a central hole 2.9 extending along its length. Two through holes 2.8 communicating with the central hole 2.9 are provided on its side wall. A raised support ring mounting portion 2.10 is provided on the outer surface of the safety valve core 2.1 between the two through holes 2.8. A support ring 2.6 is fitted onto the support ring mounting portion 2.10 and positioned between the two through holes 2.8. Two dustproof rings 2.5 are respectively fitted onto the outside of the safety valve core 2.1 and positioned on both sides of the support ring 2.6. One end of a waterproof vent valve 2.7 is connected to the safety valve core 2.1, and the other end is provided with a filter membrane 2.11 and a breathable layer 2.12. The mounting support ring 2.6 of the safety valve core 2.1, the waterproof vent valve 2.7, and one end of the two dustproof rings 2.5 are all placed inside the safety valve protective sleeve 2.3. A spacer ring 2.2 is provided between the end of the safety valve core 2.1 extending outside the safety valve protective sleeve 2.3 and the safety valve protective sleeve 2.3. The opening of the non-connecting spacer ring 2.2 end of the safety valve protective sleeve 2.3 is perpendicular to the opening of the connecting spacer ring 2.2 end. The vent valve 3 includes a vent valve body 3.1, the small end of which is connected to the cylinder body shell of the brake cylinder 1. The sealing valve core 3.2 is placed inside the large end of the vent valve body 3.1. The sealing valve core 3.2 has a protruding lip 3.21. Under the action of airflow flowing from the small end to the large end of the vent valve body 3.1, the lip 3.21 can open in one direction and close in the case of reverse airflow or no airflow. The positioning ring 3.3 is placed inside the large end of the vent valve body 3.1 to press and seal the valve core 3.2 around its perimeter. The positioning ring 3.3 is provided with a vent hole 3.31, which forms an air passage with the lip 3.21. The large end of the vent valve body 3.1 is placed inside the rubber protective sleeve 3.5, and the other end of the rubber protective sleeve 3.5 is open to the atmosphere.

[0037] The aforementioned brake cylinder protection assembly protects brake cylinder 1 through the combination of safety valve 2 and vent valve 3. The central hole 2.9 on the safety valve core 2.1 and the waterproof vent valve 2.7 form a continuous air passage; the waterproof vent valve 2.7, through the filter membrane 2.11 and the breathable layer 2.12, ensures that moisture is prevented from entering without affecting the brake cylinder's permeability; the safety valve protective sleeve 2.3 isolates rain, snow, and other moisture from entering the safety valve core 2.1 under severe weather conditions; see also... Figure 5The vent valve 3, through the lip 3.21 of the sealing valve core 3.2, can open in one direction when airflow is needed to achieve the balance of air pressure inside and outside the brake cylinder. In the case of reverse airflow or no airflow, the lip 3.21 closes to prevent impurities in the outside air from entering.

[0038] This brake cylinder protection assembly effectively prevents the external environment from affecting the brake cylinder, extending its service life. The synergistic effect of safety valve 2 and vent valve 3 ensures the internal cleanliness and functional stability of the brake cylinder. In particular, the waterproof vent valve 2.7 and sealing valve core 3.2 ensure necessary ventilation while effectively preventing the ingress of moisture and dust. Furthermore, the assembly has a compact structure, is easy to install and maintain, further improving its practicality and reliability.

[0039] See Figure 1c and Figure 3 In one possible implementation, the spacer 2.2 of the safety valve 2 is fastened to the outside of the safety valve protective sleeve 2.3 by nylon cable ties 2.4.

[0040] In this embodiment, nylon cable ties 2.4 are used to securely connect the spacer ring 2.2 of the safety valve 2 to the safety valve protective sleeve 2.3. This fastening method not only simplifies the installation process but also improves the stability of the connection, ensuring that the safety valve protective sleeve 2.3 will not loosen or shift when subjected to external forces or vibrations, thereby effectively protecting the internal components of the safety valve 2 from environmental factors.

[0041] See Figure 1c In one possible implementation, the spacer ring 2.2 and the safety valve protective sleeve 2.3 have mating grooves and protrusions.

[0042] In this embodiment, the spacer ring 2.2 and the safety valve protective sleeve 2.3 are tightly connected through the interlocking of grooves and protrusions. The grooves and protrusions provide a good mechanical locking effect, ensuring a stable connection between the spacer ring 2.2 and the safety valve protective sleeve 2.3. This mating structure not only effectively prevents the components from loosening due to vibration or external force during use, but also improves the overall sealing performance of the protective components, further preventing the ingress of dust and moisture.

[0043] By providing matching grooves and protrusions between the spacer ring 2.2 and the safety valve protective sleeve 2.3, the strength and durability of the connection are greatly improved, the possibility of loosening between components is reduced, and the stability of the entire protection system is enhanced.

[0044] See Figure 1c In one possible implementation, the cross-section of the support ring 2.6 is a polygon including a short side and an opposite long side, and the face containing the short side is in contact with the support ring mounting portion 2.10.

[0045] In this embodiment, the cross-section of the support ring 2.6 is configured as a polygonal structure with one short side and one relatively long side. By allowing the short side to contact the support ring mounting portion 2.10, the through hole 2.8 of the safety valve core 2.1 can be sealed, while allowing airflow to pass between the support ring 2.6 and the dustproof ring 2.5.

[0046] See Figure 4 and Figure 7 In one possible implementation, a retaining ring 3.4 for holes is provided between the positioning ring 3.3 and the inwardly protruding edge 3.11 of the large end of the vent valve body 3.1 to press against the outer periphery of the positioning ring 3.3.

[0047] In this embodiment, the positioning ring 3.3 is tightly connected to the edge 3.11 of the large end of the vent valve body 3.1 via a retaining ring 3.4 with a hole. The retaining ring 3.4 is located on the outer periphery of the positioning ring 3.3 and engages with the inner edge 3.11 of the large end of the vent valve body 3.1, securing the positioning ring 3.3 within the vent valve body 3.1 through mechanical pressing. This ensures the stability of the sealing valve core 3.2 within the vent valve body 3.1, preventing the positioning ring 3.3 from shifting under the influence of airflow or vibration, thereby guaranteeing the normal operation of the vent valve 3.

[0048] By providing a retaining ring 3.4 for the hole between the positioning ring 3.3 and the edge 3.11 of the vent valve body 3.1, this embodiment effectively improves the installation stability and operational reliability of the vent valve assembly. The use of the retaining ring ensures the precise positioning of the positioning ring 3.3 within the valve body, reducing the risk of failure due to component loosening and extending the product's service life.

[0049] See Figure 4 and Figure 7 In one possible implementation, the outer periphery of the connection between the large end of the vent valve body 3.1 and the rubber protective sleeve 3.5 is fastened by a cable tie 3.6.

[0050] In this embodiment, the large end of the vent valve body 3.1 is fastened to the connection point of the rubber protective sleeve 3.5 using a cable tie 3.6. The cable tie 3.6 is wrapped around the outer periphery of the vent valve body 3.1 and the rubber protective sleeve 3.5, and the applied tightening force ensures a sealed connection between the two. This connection method not only prevents the rubber protective sleeve 3.5 from loosening due to vibration or external force during use, but also effectively prevents dust and impurities in the outside air from entering the vent valve through the connection point, ensuring the normal function of the vent valve.

[0051] In one possible implementation, the aperture of the end of the rubber protective sleeve 3.6 that opens to the atmosphere is smaller than the aperture of the end that is sleeved on the outside of the vent valve body 3.1.

[0052] In this embodiment, the rubber protective sleeve 3.6 has a smaller aperture at the end that opens to the atmosphere, while the larger aperture at the end that fits over the vent valve body 3.1. The smaller aperture effectively restricts external dust and impurities from entering the protective sleeve, while also helping to slow down airflow, thereby better protecting the internal structure and function of the vent valve body 3.1.

[0053] A brake cylinder protection assembly according to one embodiment of the present invention is described in detail below;

[0054] To address the current problem of poor sealing caused by water vapor ingress in unit brake cylinders, the present invention provides a novel ventilation, drainage, and dust prevention device for unit brake cylinders, which effectively improves the protective performance of unit brake cylinders and enhances their adaptability to extreme environments.

[0055] This application provides a unit brake cylinder protection assembly / ventilation, drainage, and dustproof device to solve the problem in the prior art where, due to extreme weather conditions, the unit brake cylinder breather is covered by ice, snow, or water and forced to inhale water vapor. This water vapor then freezes at low temperatures and adheres to the inner wall of the piston, further causing piston seal leakage. This ensures the smooth operation of locomotives and rolling stock.

[0056] 2.1 Product Structure

[0057] This application provides a ventilation, drainage, and dust prevention device for a unit brake cylinder. See also... Figure 1a It includes a unit brake cylinder 1, a safety valve 2, and a vent valve 3, wherein the safety valve 2 and the vent valve 3 are both installed on the unit brake cylinder 1.

[0058] See Figure 1c Safety valve 2 includes safety valve core 2.1, spacer ring 2.2, safety valve protective sleeve 2.3, nylon cable tie 2.4, dustproof ring 2.5, support ring 2.6 and waterproof and breathable valve 2.7.

[0059] Installation process of safety valve 2: One end of safety valve core 2.1 is threadedly connected to waterproof and breathable valve 2.7, and the other end is sequentially installed with dustproof ring 2.5, support ring 2.6 and dustproof ring 2.5, ensuring that the lip of dustproof ring 2.5 is pressed tightly against support ring 2.6. Finally, spacer ring 2.2, safety valve protective sleeve 2.3 and nylon cable tie 2.4 are installed, and the threaded end of safety valve core 2.1 is installed on unit brake cylinder.

[0060] The working principle of a safety valve: see [link / reference] Figure 9 and Figure 11When the unit brake cylinder brakes or releases, atmospheric air flows out or into the non-sealed cavity of the unit brake cylinder through the waterproof vent valve 2.7 and the safety valve core 2.1. The waterproof vent valve 2.7 can isolate moisture in the outside atmosphere. When the internal pressure of the unit brake cylinder needs to be released quickly, compressed air flows into the space between the dustproof ring 2.5 and the support ring 2.6 through the through hole 2.8 of the safety valve core 2.1, compressing the lip of the dustproof ring 2.5, so that the compressed air can flow into the atmosphere quickly.

[0061] The vent valve 3 includes a vent valve body 3.1, a sealing valve core 3.2, a positioning ring 3.3, a retaining ring for the hole 3.4, a rubber protective sleeve 3.5, and a cable tie 3.6.

[0062] Installation process of the vent valve: Place the sealing valve core 3.2 into the vent valve body 3.1, install the positioning ring 3.3 and the hole retaining ring 3.4 in sequence, then use cable ties 3.6 to fix the rubber protective sleeve 3.5 to the vent valve body 3.1, and finally fix the vent valve to the unit brake cylinder through threaded connection.

[0063] Working principle of vent valve 3: See Figure 6 , Figure 8 and Figure 10 When the unit brake cylinder is braking, the air in the non-sealed cavity of the unit brake cylinder is acted upon by the back pressure, and then through the breather valve body 3.1 and the lip of the sealing valve core 3.2 is opened, and then enters the atmosphere through the vent hole of the positioning ring 3.3. When the unit brake cylinder is released, the non-sealed cavity 4 of the unit brake cylinder forms a negative pressure, and the exhaust port of the sealing valve core 3.2 is in a closed state, so that external water vapor cannot flow into the unit brake cylinder.

[0064] 2.2 Work Process

[0065] Braking process: During braking, the air in the non-sealed chamber 4 is discharged through the lip of the sealing valve core 3.2 of the vent valve 3 and the waterproof vent valve 2.7 of the safety valve 2, maintaining the internal and external pressure balance;

[0066] Relief process: During relief, the sealing valve core 3.2 lip 3.21 of the vent valve 3 is closed, and the outside atmosphere slowly enters the non-sealed cavity 4 through the waterproof vent valve 2.7 of the safety valve 2, maintaining the internal and external pressure balance. The safety valve protective sleeve 2.3 of the safety valve 2 can prevent rainwater, snow, sand, foreign objects and other substances from entering.

[0067] Under extreme operating conditions, if only the vent valve is covered by ice and snow, during braking, air in the non-sealed chamber 4 is discharged through the safety valve core 2.1 of safety valve 2 and the waterproof vent valve 2.7 to maintain internal and external pressure balance. During release, outside air slowly enters the non-sealed chamber 4 through the waterproof vent valve 2.7 of safety valve 2, maintaining internal and external pressure balance. The safety valve protective sleeve 2.3 of safety valve 2 can prevent rainwater, snow, sand, foreign objects, etc., from entering the non-sealed chamber of the brake cylinder through the waterproof vent valve 2.7 of safety valve 2. If both the vent valve and the safety valve are covered by ice and snow, outside water cannot enter the non-piston sealed chamber of the unit brake cylinder during braking and release, without affecting the function and performance of the brake cylinder. After the covering ice and snow melt, the vent valve and the safety valve resume their function. This completely solves the sealing leakage problem caused by water being drawn into the unit brake cylinder and freezing at low temperatures under extreme weather conditions such as heavy snow, blizzards, or sleet and low-temperature operating conditions.

[0068] This invention proposes a vent valve with a sealing valve core. This valve core is mounted on the vent valve body via a positioning ring and a retaining ring. In the relaxed state, the lip of the sealing valve core is closed. When the non-sealed cavity is under negative pressure, the sealing lip closes even more tightly, further improving the protective capability. When the non-sealed cavity is under positive pressure, the closed sealing lip automatically opens under the positive pressure, and the unit braking cylinder discharges the internal air and water into the atmosphere.

[0069] The safety valve of this invention is equipped with a waterproof and breathable valve, which allows air to freely enter and exit from both sides of the non-sealed cavity while preventing the entry of external water.

[0070] The present invention employs a breathing structure combining a vent valve, a waterproof vent valve for the safety valve, and a protective sleeve for the safety valve. This structure retains the breathing function of the brake cylinder while effectively preventing the ingress of ice, snow, and rainwater. The vent valve effectively prevents water, rain, and snow from entering from the bottom of the brake cylinder and also has a drainage function. The use of the waterproof vent valve and the protective sleeve for the safety valve ensures the basic breathing function of the brake cylinder while adding a protective function.

[0071] The brake cylinder protection assembly of the present invention has the following beneficial effects:

[0072] This application relates to a brake cylinder protection component / unit brake cylinder venting and waterproofing device. The venting valve is located at the lowest point of the unit brake cylinder. This venting valve allows for one-way exhaust and drainage from the non-piston sealed cavity of the unit brake cylinder to the outside atmosphere, while also preventing external moisture, dust, and foreign matter from entering the non-piston sealed cavity. During braking, the air inside the non-sealed cavity is compressed, and the sealing lip of the venting valve is in the open state, balancing the pressure inside and outside the non-sealed cavity. Even if the venting valve is completely submerged in ice, snow, water, etc., moisture cannot enter the non-piston sealed cavity of the unit brake cylinder.

[0073] The safety valve is located in the middle of the unit brake cylinder. The vent and waterproof valve of the safety valve can realize bidirectional flow between the non-piston sealed cavity of the unit brake cylinder and the outside atmosphere, meet the air intake requirements of the non-sealed cavity of the unit brake cylinder, and at the same time prevent external water, sand and dust from entering the non-piston sealed cavity of the unit brake cylinder. Even if the vent valve is covered by ice, snow, water and other materials and is completely submerged, water and sand and dust cannot enter the non-piston sealed cavity of the unit brake cylinder. The safety valve can also discharge the high-pressure gas inside the unit brake cylinder in a timely manner.

[0074] The combined function of the safety valve and the vent valve allows for bidirectional gas flow between the non-piston sealed cavity of the unit brake cylinder and the outside atmosphere. The vent valve can discharge gas and water from the non-piston sealed cavity, while the safety valve can quickly discharge high-pressure gas. Simultaneously, it prevents external water, sand, and foreign matter from entering the non-piston sealed cavity. Even in extreme conditions where the safety valve and vent valve are completely covered by ice, snow, or water, external water cannot enter the non-piston sealed cavity. This completely solves the problem of sealing leakage caused by water accumulating in the unit brake cylinder and freezing at low temperatures during extreme weather conditions such as heavy rain, blizzards, snowstorms, or sleet.

[0075] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A brake cylinder protection assembly, characterized in that, include: Safety valve (2) and vent valve (3) are installed on the outer shell of brake cylinder (1); wherein, Safety valve (2) includes: The safety valve core (2.1) has a central hole (2.9) that runs through the length direction, and two through holes (2.8) that connect the central hole (2.9) of the valve core are provided on its side wall. The outer surface of the safety valve core (2.1) between the two through holes (2.8) is provided with a raised support ring mounting part (2.10). A support ring (2.6) is fitted onto the support ring mounting part (2.10) and positioned between two through holes (2.8); Two dustproof rings (2.5) are fitted over the safety valve core (2.1) and placed on both sides of the support ring (2.6); A waterproof and breathable valve (2.7) is provided with a safety valve core (2.1) at one end and a filter membrane (2.11) and a breathable layer (2.12) at the other end; The mounting support ring (2.6) of the safety valve core (2.1), the waterproof and breathable valve (2.7), and one end of the two dustproof rings (2.5) are all placed inside the safety valve protective sleeve (2.3). A spacer ring (2.2) is provided between the end of the safety valve core (2.1) that extends out of the safety valve protective sleeve (2.3) and the safety valve protective sleeve (2.3). The opening of the safety valve protective sleeve (2.3) at one end of the non-connecting spacer (2.2) is perpendicular to the opening at one end of the connecting spacer (2.2); The vent valve (3) includes: The vent valve body (3.1) has its small end connected to the cylinder shell of the brake cylinder (1); The sealing valve core (3.2) is placed inside the large end of the vent valve body (3.1). The sealing valve core (3.2) has a protruding lip (3.21). The lip (3.21) can be opened in one direction under the action of the airflow flowing from the small end to the large end of the vent valve body (3.1), and closed in the reverse airflow or no airflow state. The positioning ring (3.3) is placed around the sealing valve core (3.2) inside the large end of the vent valve body (3.1). The positioning ring (3.3) is provided with a vent hole (3.31) to form an air passage with the lip (3.21). The large end of the vent valve body (3.1) is placed inside the rubber protective sleeve (3.5), and the other end of the rubber protective sleeve (3.5) is connected to the atmosphere.

2. The brake cylinder protection assembly according to claim 1, characterized in that, The spacer ring (2.2) of the safety valve (2) is fastened to the outside of the safety valve protective sleeve (2.3) by nylon cable ties (2.4).

3. The brake cylinder protection assembly according to claim 2, characterized in that, The spacer (2.2) and the safety valve protective sleeve (2.3) have mating grooves and protrusions.

4. The brake cylinder protection assembly according to claim 3, characterized in that, The cross-section of the support ring (2.6) is a polygon including a short side and a long side opposite it, and the face containing the short side is in contact with the support ring mounting part (2.10).

5. The brake cylinder protection assembly according to claim 4, characterized in that, A retaining ring (3.4) with a hole is provided between the positioning ring (3.3) and the inwardly protruding edge (3.11) of the large end of the vent valve body (3.1) to press against the outer periphery of the positioning ring (3.3).

6. The brake cylinder protection assembly according to claim 5, characterized in that, The outer periphery of the connection between the large end of the vent valve body (3.1) and the rubber protective sleeve (3.5) is fastened by a cable tie (3.6).

7. The brake cylinder protection assembly according to claim 6, characterized in that, The diameter of the end of the rubber protective sleeve (3.5) that opens to the atmosphere is smaller than the diameter of the end that is sleeved on the outside of the vent valve body (3.1).

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