Air duct connecting joint and locomotive tail air charging and exhausting device

Abstract

The application relates to a wind pipe connecting joint and a locomotive tail air charging and discharging device. The wind pipe connecting joint comprises a first connecting piece, a second connecting piece and a locking piece. The first connecting piece is provided with a first air duct, and the first connecting piece is used for being mounted on the air charging and discharging device. The first air duct is used for being connected with the joint of the air charging and discharging device. The second connecting piece is provided with a second air duct. The second connecting piece has a locking state and an unlocking state with the first connecting piece. In the locking state, the second air duct is in sealed connection with the first air duct. In the unlocking state, the second air duct is in non-sealed connection with the first air duct. The locking piece is in driving connection with the second connecting piece, and can drive the second connecting piece to switch between the locking state and the unlocking state. Through the above arrangement, the wind pipe connecting joint can guarantee the convenience, stability and sealing reliability of the connection.

Description

Technical Field

[0001] This application relates to the field of railway locomotive technology, and in particular to air duct connection joints and locomotive tail-end air filling and exhaust devices. Background Technology

[0002] In the railway freight sector, the rear ventilation system plays a crucial role in inputting and outputting high-pressure gas into and out of the train's rear air ducts, and in cutting off the rear air supply. Currently, locomotive air duct connection joints mainly include threaded joints, quick couplings, flange joints, and compression fittings.

[0003] In existing technologies, although threaded joints have a simple structure and a firm connection, they require the application of sealant or the wrapping of sealing tape, resulting in low installation efficiency and unsuitability for frequent disassembly scenarios; quick couplings, while enabling rapid connection, lack an effective limiting structure in large air circuits, making the connection prone to loosening due to vibrations during locomotive operation, leading to insufficient sealing reliability; flange joints, while having strong pressure resistance, suffer from cumbersome installation and disassembly due to their bolted connection method, failing to meet the needs of frequent operations; compression fittings are convenient to install in confined spaces, but their sealing relies on the radial contraction force of the compression fitting, posing a risk of sealing failure under high-pressure conditions.

[0004] In summary, when the tail-end air filling and exhaust device and the air duct need to be frequently disassembled and reconnected, it is difficult to simultaneously ensure the convenience, stability and sealing reliability of the connection. Especially in large and complex locomotive air duct systems, the existing joint structure design cannot effectively cope with vibration, high pressure and other working conditions, resulting in frequent failures such as gas leakage and loose connection, which seriously affects train operation safety and work efficiency. Utility Model Content

[0005] Based on this, a duct connection connector and a locomotive tail-end air filling and exhaust device are provided to solve the problem that it is difficult to simultaneously ensure the convenience, stability and sealing reliability of the connection when the tail-end air filling and exhaust device and the duct need to be frequently disassembled and connected.

[0006] An embodiment of the first aspect of this application provides a duct connection joint, comprising:

[0007] A first connector is provided with a first air duct. The first connector is used to be installed on the charging and discharging device. The first air duct is used to be connected to the connector of the charging and discharging device.

[0008] The second connector has a second air duct and is in a locked state and an unlocked state with the first connector. In the locked state, the second air duct is sealed to the first air duct. In the unlocked state, the second air duct is not sealed to the first air duct.

[0009] A locking member is driven to connect with the second connector and is capable of driving the second connector to switch between the locked state and the unlocked state.

[0010] In one embodiment, the first connector includes a flange connection structure, the first air duct is disposed on the flange connection structure, the flange connection structure is provided with a first sealing surface, the first sealing surface is used to be installed on the air filling and exhaust device, the first sealing surface is provided with a first sealing element, and the first sealing element is used to seal the connection between the first air duct and the air pipe.

[0011] In one embodiment, the first sealing surface is provided with an annular groove for embedding the first sealing element.

[0012] In one embodiment, the second connector includes a quick-connect structure, the second air duct is disposed on the quick-connect structure, the quick-connect structure is provided with a second seal, and the second seal is disposed between the flange connection structure and the quick-connect structure;

[0013] When the locking member drives the second connecting member in the locked state, the quick-connect structure presses the second sealing member onto the flange connection structure, and the second sealing member seals the connection between the first air duct and the second air duct.

[0014] In one embodiment, the second seal includes:

[0015] A sealing body is provided with a sealing connection channel, which is used to seal the connection between the first air duct and the second air duct.

[0016] A first connecting part is disposed on the sealing body, and the first connecting part is used to seal and connect with the quick connector structure under the drive of the locking member;

[0017] The second connecting part is disposed on the sealing body and is used for sealing connection with the flange connection structure.

[0018] In one embodiment, the quick connector structure is provided with a sealing disc, the sealing disc is provided with a second sealing surface, the second sealing surface is used for sealing connection with the first connecting part;

[0019] The flange connection structure is provided with a sealing groove, which is used to seal the connection with the second connection part.

[0020] In one embodiment, the locking element includes;

[0021] A locking body, which is rotatably connected to the quick-connect structure;

[0022] A limiting mechanism, which is fixedly connected to the flange connection structure;

[0023] In the locked state, the locking body rotates until it abuts against the limiting mechanism and can no longer rotate. The locking body presses the quick connector structure against the second seal, driving the second seal to press against the flange connection structure. The second seal seals the connection between the first air duct and the second air duct.

[0024] In one embodiment, the limiting mechanism includes:

[0025] The first limiting member is fixedly connected to the flange connection structure. The first limiting member is provided with a pin hole, and a pin is inserted into the pin hole.

[0026] The second limiting member is fixedly connected to the flange connection structure, and a limiting block is provided on the second limiting member;

[0027] In the locked state, one end of the locking body abuts against the pin, and the other end abuts against the limiting block.

[0028] In one embodiment, the locking element further includes:

[0029] The first locking block is fixedly connected to the locking body. The first locking block is provided with a first guide ramp, which is used to abut against the pin.

[0030] The second locking block is fixedly connected to the locking body. The second locking block is provided with a second guide ramp, which is used to abut against the second limiting member.

[0031] An embodiment of the second aspect of this application provides a locomotive tail-end air supply and exhaust device, including an air inlet connector, an air outlet connector, and at least two air duct connection connectors as described in any of the above embodiments, wherein one of the air duct connection connectors is connected to the air inlet connector, and the other air duct connection connector is connected to the air outlet connector.

[0032] According to the air duct connection joint and locomotive rear air filling and exhaust device of the embodiments of this application, the locking member and the second connecting member are driven to switch directly between the locked and unlocked states. This drive connection method does not require additional tools or complex operations; the state transition can be completed through the locking member, meeting the needs of frequent disassembly. The state switching logic between the second connecting member and the first connecting member is clear. The locking member, as a power transmission component, simplifies the operation process and shortens the operation time. When the second connecting member is in the locked state, it forms a fixed connection structure with the first connecting member. At this time, the positions of the second air duct and the first air duct are relatively fixed, avoiding loosening of the connection due to vibration during locomotive operation. The drive connection of the locking member allows the second connecting member and the first connecting member to fit tightly together, forming a mechanical lock, preventing displacement of both under gas pressure or external force, and ensuring the stability of the connection state. In the locked state, the second air duct and the first air duct are sealed together. The sealing connection depends on the driving force provided by the locking member in the locked state, which can ensure that the sealing structure can still maintain effective compression under high-pressure gas conditions, maintaining the reliability of the seal. The above settings ensure that the duct connection joints are convenient, stable, and have reliable sealing. Attached Figure Description

[0033] Figure 1 This is a cross-sectional view of the locked state of a duct connection joint according to an embodiment of this application.

[0034] Figure 2 This is a schematic diagram of the unlocked state of a duct connection joint according to an embodiment of this application.

[0035] Figure 3 This is an exploded view of a duct connection joint according to an embodiment of this application.

[0036] Figure 4 This is a partial cross-sectional view of a duct connection joint according to an embodiment of this application.

[0037] Figure 5 This is a schematic diagram of the structure of the first connector in a duct connection joint according to an embodiment of this application.

[0038] Figure 6 This is a schematic diagram of the locked state of a duct connection joint according to an embodiment of this application.

[0039] Figure 7 This is a schematic diagram of the structure of a duct connection joint installed in the air supply and exhaust device at the rear of a locomotive, according to an embodiment of this application.

[0040] Figure label:

[0041] 10000, Locomotive rear air charging and discharging device;

[0042] 1000. Duct connection joints;

[0043] 100. First connecting piece; 110. Flange connection structure; 111. First air duct; 112. First sealing surface; 113. Annular groove; 114. Sealing groove; 120. First sealing element;

[0044] 200. Second connector; 210. Quick connector structure; 211. Second air duct; 212. Sealing disc; 2121. Second sealing surface; 220. Second sealing element; 221. Sealing body; 2211. Sealing connection channel; 222. First connecting part; 223. Second connecting part;

[0045] 300. Locking component; 310. Locking body; 311. Rotating hole; 312. Handle; 320. Limiting mechanism; 321. First limiting component; 3211. Pin hole; 3212. Pin shaft; 322. Second limiting component; 3221. Limiting block; 330. First locking block; 331. First guide ramp; 340. Second locking block; 341. Second guide ramp;

[0046] 2000, Air inlet connector;

[0047] 3000, air outlet connector. Detailed Implementation

[0048] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0049] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0050] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0052] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0054] See Figure 1 and Figure 2At least one embodiment of this application provides a duct connector 1000, which includes a first connector 100, a second connector 200, and a locking member 300. The first connector 100 is provided with a first air duct 111 and is used to be installed on a charging / draining device. The first air duct 111 is used to connect to the connector of the charging / draining device. The second connector 200 is provided with a second air duct 211, and the second connector 200 and the first connector 100 have a locked state and an unlocked state. In the locked state, the second air duct 211 and the first air duct 111 are sealed together. In the unlocked state, the second air duct 211 and the first air duct 111 are not sealed together. The locking member 300 is driven to the second connector 200 and is capable of driving the second connector 200 to switch between the locked state and the unlocked state.

[0055] According to the duct connector 1000 of this application embodiment, the locking member 300 is driven to connect with the second connector 200, and can directly drive the second connector 200 to switch between a locked state and an unlocked state. This drive connection method does not require additional tools or complex operations; the state transition can be completed through the locking member 300, meeting the needs of frequent disassembly. The state switching logic between the second connector 200 and the first connector 100 is clear. The locking member 300, as a power transmission component, simplifies the operation process and shortens the operation time. When the second connector 200 is in the locked state, it forms a fixed connection structure with the first connector 100. At this time, the positions of the second air duct 211 and the first air duct 111 are relatively fixed, avoiding loosening of the connection due to vibration during locomotive operation. The drive connection of the locking member 300 allows the second connector 200 and the first connector 100 to fit tightly together, forming a mechanical lock, preventing displacement of both under gas pressure or external force, and ensuring the stability of the connection state. In the locked state, the second air duct 211 is sealed to the first air duct 111. The sealing connection relies on the driving force provided by the locking element 300 in the locked state, which ensures that the sealing structure can maintain effective compression and maintain sealing reliability under high-pressure gas conditions. Through the above settings, the air duct connection joint 1000 can guarantee the convenience, stability and sealing reliability of the connection.

[0056] See Figure 3 In some embodiments, the first connector 100 includes a flange connection structure 110, a first air duct 111 is disposed on the flange connection structure 110, the flange connection structure 110 is provided with a first sealing surface 112, the first sealing surface 112 is used to be installed on the air filling and exhaust device, the first sealing surface 112 is provided with a first sealing element 120, and the first sealing element 120 is used to seal the connection between the first air duct 111 and the air pipe.

[0057] Specifically, the flange connection structure 110 is installed on the air filling and exhaust device via bolts or other fixing methods, providing a stable foundation support for the entire duct connection joint 1000 and ensuring no displacement under operating conditions such as locomotive vibration. The first air duct 111 is set on the flange connection structure 110 and directly connects to the joint of the air filling and exhaust device, forming the main channel for gas input or output. The rigid fixing method of the flange connection structure 110 ensures a long-term stable connection between the first connector 100 and the air filling and exhaust device, avoiding the loosening problem caused by frequent disassembly of traditional quick connectors. This design is particularly suitable for the fixed end of the air filling and exhaust device, eliminating the need for frequent disassembly and ensuring the reliability of the basic connection. The sealing effect formed by mechanical compression can adapt to high-pressure gas conditions and maintain the tightness of the seal even in vibration environments, preventing leakage.

[0058] The sealing surface is machined to a flat surface to ensure a tight fit with the mounting surface of the air filling and exhaust device, reducing the possibility of gas leakage. When the flange connection structure 110 is fixed to the air filling and exhaust device, the first seal 120 is squeezed between the flange sealing surface and the air filling and exhaust device interface, filling the microscopic gaps between the two surfaces to form an airtight barrier and prevent high-pressure gas from leaking from the connection.

[0059] Through the above configuration, the fixed-end sealing and structural stability of the air filling and exhaust device are integrated into the first connector 100, providing a reliable foundation for the entire duct joint system. The rigid fixing of the flange connection structure 110 ensures connection stability, while the cooperation between the sealing surface and the first sealing element 120 achieves high airtightness. Simultaneously, the need for frequent disassembly is transferred to the second connector 200, thus comprehensively solving the problem of balancing convenience, stability, and sealing reliability during frequent disassembly.

[0060] See Figure 3 In some embodiments, the first sealing surface 112 is provided with an annular groove 113 for embedding the first sealing element 120. The annular groove 113 limits the position of the sealing element, preventing it from shifting during installation. The first sealing element 120, such as a sealing ring or gasket, is installed on the first sealing surface 112 and embedded in the annular groove 113, achieving a seal through mechanical compression. The sealing effect formed by mechanical compression can adapt to high-pressure gas conditions and maintains the compressed state of the sealing element even in vibration environments, preventing leakage.

[0061] See Figure 3 and Figure 4In some embodiments, the second connector 200 includes a quick-connect structure 210, a second air duct 211 disposed on the quick-connect structure 210, and a second seal 220 disposed between the flange connection structure 110 and the quick-connect structure 210. When the locking member 300 drives the second connector 200 into a locked state, the quick-connect structure 210 presses the second seal 220 against the flange connection structure 110, and the second seal 220 seals the connection between the first air duct 111 and the second air duct 211.

[0062] With the above configuration, the second connector 200 adopts a quick-connect structure 210 to achieve rapid connection and disconnection with the duct, adapting to frequent disassembly scenarios. Compared to traditional threaded or flange connections, the quick-connect structure 210, driven by the locking element 300, can complete the installation and removal of the duct in a short time, improving operational efficiency. The second air duct 211 is located inside the quick-connect structure 210 and connects with the first air duct 111 of the first connector 100 to form a complete gas flow channel. The inner diameter and shape of this air duct must match the duct to ensure minimal resistance during high-pressure gas flow and meet the gas path requirements of the charging and discharging device.

[0063] The second seal 220 is positioned between the flange connection structure 110 and the quick-connect structure 210, between their contact surfaces. This design makes the seal a critical barrier at the connection interface, directly affecting the sealing effect between the first air duct 111 and the second air duct 211. When the locking element 300 drives the second connector 200 to switch to the locked state, the quick-connect structure 210 moves or rotates towards the flange connection structure 110, generating a mechanical clamping force on the second seal 220. After being compressed, the second seal 220 undergoes elastic deformation, filling the microscopic gap between the flange connection structure 110 and the quick-connect structure 210, forming an airtight barrier to prevent high-pressure gas leakage from the connection. The cooperation between the quick-connect structure 210 and the locking element 300 allows the second connector 200 to switch states with simple movements, enabling tool-free installation and removal of the ductwork, solving the problem of cumbersome operation during frequent disassembly of traditional connectors. The mechanical compression seal relies on the continuous pressure provided by the locking element 300. Even under locomotive vibration or high-pressure gas impact, the second seal 220 remains compressed, preventing seal failure. The second seal 220 is positioned between the first connector 100 and the quick-connect structure 210, allowing it to contact both the flange connection structure 110 and the quick-connect structure 210 simultaneously, forming a double seal. In the locked state, the quick-connect structure 210 is fixed by the locking element 300, forming a rigid connection with the first connector 100, preventing displacement or loosening due to vibration. The compression of the second seal 220 also enhances the connection rigidity of both components, further improving system stability.

[0064] See Figure 3 and Figure 4 In some embodiments, the second seal 220 includes a sealing body 221, a first connecting portion 222, and a second connecting portion 223. The sealing body 221 is provided with a sealing connection channel 2211, which is used to seal and connect the first air duct 111 and the second air duct 211. The first connecting portion 222 is disposed on the sealing body 221 and is used to seal and connect with the quick connector structure 210 under the drive of the locking member 300. The second connecting portion 223 is disposed on the sealing body 221 and is used to seal and connect with the flange connection structure 110.

[0065] In some embodiments, the quick connector structure 210 is provided with a sealing disc 212, and the sealing disc 212 is provided with a second sealing surface 2121, which is used for sealing connection with the first connecting portion 222. The flange connection structure 110 is provided with a sealing groove 114, which is used for sealing connection with the second connecting portion 223.

[0066] Specifically, the second sealing surface 2121 is a plane, used for direct contact with the first connecting portion 222 of the second sealing element 220. The first connecting portion 222 contacts the second sealing surface 2121 of the sealing disc 212. When the quick-connect structure 210 is driven by the locking member 300, the first connecting portion 222 is pressed against the second sealing surface 2121, forming a first layer of sealing barrier. The second connecting portion 223 is embedded in the sealing groove 114 of the flange connection structure 110 and is squeezed by the side wall of the groove, forming a second layer of sealing barrier. When the locking member 300 drives the quick-connect structure 210 to move towards the flange connection structure 110, the quick-connect structure 210 pushes the second sealing element 220 to be squeezed, causing the first connecting portion 222 to be pressed against the second sealing surface 2121, resulting in a tight fit. Under the squeezing action, the second sealing element 220 blocks the gas leakage path between the first air duct 111 and the second air duct 211, achieving a high airtightness connection. The planar seal between the second sealing surface 2121 and the first connecting portion 222 effectively addresses the risk of large-area leakage; the interlocking seal between the sealing groove 114 and the second connecting portion 223 prevents leakage from local gaps. Together, they form a multi-layered sealing system, ensuring system airtightness even if one sealing surface fails. The planar seal between the second sealing surface 2121 and the first connecting portion 222 effectively addresses the risk of large-area leakage; the second sealing surface 2121 of the sealing disc 212 provides a rigid support surface for the second sealing element 220, preventing displacement under high-pressure gas. The limiting effect of the sealing groove 114 on the second connecting portion 223 ensures the relative position of the quick-connect structure 210 and the flange connection structure 110 is fixed, preventing loosening or misalignment of the seal due to vibration. The planar contact design between the second sealing surface 2121 and the first connecting portion 222 reduces the difficulty of alignment during installation, ensuring that the quick-connect structure 210 can accurately press the seal when locked, improving operational efficiency.

[0067] With the above settings, the rigid plane of the sealing disc 212 provides basic sealing support, and the geometric limit of the sealing groove 114 enhances the compression effect of the sealing element. Finally, double sealing is achieved in the locked state, which not only ensures the sealing reliability under high pressure gas conditions, but also meets the frequent disassembly requirements of the air duct and the air filling and exhaust device through the modular structure design, solving the problem of single sealing and easy leakage of traditional joints.

[0068] See Figure 3 and Figure 5In some embodiments, the locking member 300 includes a locking body 310 and a limiting mechanism 320. The locking body 310 is rotatably connected to the quick connector structure 210. The limiting mechanism 320 is fixedly connected to the flange connection structure 110. In the locked state, the locking body 310 rotates until it abuts against the limiting mechanism 320 and cannot continue to rotate. The locking body 310 presses the quick connector structure 210 against the second seal 220, driving the second seal 220 to press against the flange connection structure 110. The second seal 220 seals the connection between the first air duct 111 and the second air duct 211.

[0069] Specifically, the locking body 310 is the actuator that drives the second connector 200 to switch states. The locking body 310 is provided with a rotating hole 311, through which it is fitted onto the outer wall of the quick connector structure 210, directly forming a rotatable connection with it. A handle 312 is fixedly connected to the locking body 310. The operator rotates the handle 312 of the locking body 310 to transmit rotational kinetic energy to the quick connector structure 210, causing it to move towards the flange connection structure 110. When the locking body 310 rotates to abut against the limiting mechanism 320 (such as a pin 3212 or a limiting block 3221), it is blocked from further rotation by the limiting mechanism 320. At this point, the quick connector structure 210 reaches the locking position, forming a mechanically locked state, thus achieving the switching between the locked and unlocked states.

[0070] During the rotation of the locking body 310 to the limit position, it applies axial pressure to the quick-connect structure 210. The quick-connect structure 210 transmits this pressure to the second seal 220, pressing it against the second sealing surface 2121 of the flange connection structure 110. The second seal 220, after being compressed, elastically deforms, filling the gap between the flange connection structure 110 and the quick-connect structure 210, thus achieving a sealed connection between the first air duct 111 and the second air duct 211. The rotation drive of the locking body 310 requires no tools; switching between the locking and unlocking states can be completed simply by manual rotation, adapting to frequent disassembly scenarios and significantly reducing operation time compared to traditional bolt connections. The mechanical stop function of the limit mechanism 320 allows the operator to judge whether the locking position has been reached by feel, reducing operational difficulty. After the locking body 310 and the limit mechanism 320 abut against each other, a rigid lock is formed, preventing the quick-connect structure 210 from rotating or displacing due to vibration or gas pressure, ensuring long-term stable connection. The fixed connection between the limiting mechanism 320 and the flange connection structure 110 binds the support base of the entire locking system to the first connecting member 100, preventing the locking member 300 from loosening. The clamping force applied by the locking body 310 acts directly on the second sealing member 220, ensuring that it remains compressed under high-pressure gas conditions and preventing seal failure. The precise stop of the limiting mechanism 320 ensures that the locking body 310 rotates to the same position each time, guaranteeing the consistency of the clamping force on the second sealing member 220 and preventing leakage due to insufficient clamping.

[0071] See Figure 3 and Figure 5In some embodiments, the limiting mechanism 320 includes a first limiting member 321 and a second limiting member 322. The first limiting member 321 is fixedly connected to the flange connection structure 110 and has a pin hole 3211 with a pin 3212 inserted inside. The second limiting member 322 is fixedly connected to the flange connection structure 110 and has a limiting block 3221. In the locked state, one end of the locking body 310 abuts against the pin 3212, and the other end abuts against the limiting block 3221. The first limiting member 321 is fixedly connected to the flange connection structure 110, such as by welding, bolting, or integral molding, and has a pin hole 3211 with a pin 3212 inserted inside. The pin 3212 serves as the core component of the mechanical stop. The pin 3212 is used to limit the rotation range of the locking body 310, and its positional accuracy directly affects the accuracy of the locking state. The second limiting member 322 is also fixedly connected to the flange connection structure 110, and a limiting block 3221 is provided on it. The limiting block 3221 is a raised rigid structure, such as a block or column. When the operator rotates the locking body 310, the locking body 310 rotates synchronously with the quick coupling structure 210 or is pushed towards the flange connection structure 110. When the locking body 310 rotates to a specific angle, one end abuts against the pin 3212 of the first limiting member 321, and the other end abuts against the limiting block 3221 of the second limiting member 322. Since the pin 3212 and the limiting block 3221 are both fixed on the flange connection structure 110, the locking body 310 is blocked in both directions and cannot continue to rotate. At this time, the quick coupling structure 210 reaches the locking position and forms a rigid locking state. While the locking body 310 is in contact with the limit, it applies axial pressure to the quick connector structure 210, pushing it to press the second seal 220. The second seal 220 is pressed onto the second sealing surface 2121 of the flange connection structure 110, achieving a sealed connection between the first air duct 111 and the second air duct 211. At this time, the limiting mechanism 320 ensures the stability and consistency of the pressing force.

[0072] Furthermore, the bidirectional limiting design of the pin 3212 and the limiting block 3221 ensures that the locking body 310 stops at the same position each time it rotates, guaranteeing a constant clamping force on the second seal 220 and preventing leakage due to insufficient clamping or damage to the seal due to excessive clamping. The mechanical hard-limiting method is unaffected by vibration, temperature, or other factors, ensuring long-term accuracy of the locking position. The locking body 310 abuts against the pin 3212 and the limiting block 3221 at both ends, forming a two-point fixed rigid support that prevents rotation or displacement under locomotive vibration or gas pressure fluctuations, thus preventing the quick-connect structure 210 from loosening.

[0073] See Figure 5 and Figure 6In some embodiments, the locking member 300 further includes a first locking block 330 and a second locking block 340. The first locking block 330 is fixedly connected to the locking body 310 and is provided with a first guide ramp 331 for abutting against the pin 3212. The second locking block 340 is fixedly connected to the locking body 310 and is provided with a second guide ramp 341 for abutting against the second limiting member 322.

[0074] Specifically, the first locking block 330 is fixedly connected to the locking body 310 and rotates synchronously with the locking body 310. A first guide ramp 331 is provided on the first locking block 330. The first guide ramp 331 abuts against the pin 3212 of the first limiting member 321, guiding the components to precisely engage during the rotation of the locking body 310 and reducing operational resistance. This allows the quick-connect structure 210 to smoothly engage when approaching the flange connection structure 110, avoiding rigid collisions or inaccurate positioning. The inclination angle of the ramp surface of the first guide ramp 331, such as 45°, forms a guide trajectory. Even if there is a slight deviation in the operator's rotation angle, the ramp surface can automatically correct the position of the locking body 310 through thrust, ensuring its alignment with the pin 3212 and the limiting block 3221. The second locking block 340 is also fixedly connected to the locking body 310 and rotates synchronously with the locking body 310. The second locking block 340 is provided with a second guide ramp 341, which is used to abut against the limiting block 3221 of the second limiting member 322. Its geometry matches the contact surface of the limiting block 3221 to ensure stability during abutment.

[0075] When the operator rotates the locking body 310, the first guide ramp 331 of the first locking block 330 gradually approaches the pin 3212. After the ramp surface contacts the pin 3212, the inclined surface thrust guides the rotation direction of the locking body 310, reducing rotational resistance and making the locking operation smoother. At the same time, the second guide ramp 341 of the second locking block 340 contacts the limiting block 3221 of the second limiting member 322. The ramp surface pushes the limiting block 3221, further guiding the locking body 310 to rotate towards the locking position, avoiding jamming or incomplete locking due to deviation in the operating angle. When the locking body 310 rotates to the limit position, the first guide ramp 331 fully abuts against the pin 3212, and the second guide ramp 341 fully abuts against the limiting block 3221. At this time, the normal force of the ramp surface is converted into axial pressure, pushing the quick coupling structure 210 to press the second sealing member 220.

[0076] See Figure 7At least one embodiment of this application provides a locomotive tail-end air charging and discharging device 10000, which includes an air inlet connector 2000, an air outlet connector 3000, and at least two air duct connection connectors 1000 of any of the above embodiments. One air duct connection connector 1000 is connected to the air inlet connector 2000, and the other air duct connection connector 1000 is connected to the air outlet connector 3000.

[0077] According to an embodiment of this application, the locomotive rear-end air charging and discharging device 10000 includes an air inlet connector 2000 and an air outlet connector 3000, each connected to an air duct via a duct connection connector 1000. The locking member 300 of each duct connection connector 1000 can drive the second connecting member 200 to switch between a locked state and an unlocked state, allowing for quick connection and disconnection of the air duct without tools, ensuring convenient connection, stability, and reliable sealing, and adapting to the frequent loading and unloading needs in freight scenarios.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A duct connection connector, characterized in that, include: A first connector is provided with a first air duct. The first connector is used to be installed on the charging and discharging device. The first air duct is used to be connected to the connector of the charging and discharging device. The second connector has a second air duct and is in a locked state and an unlocked state with the first connector. In the locked state, the second air duct is sealed to the first air duct. In the unlocked state, the second air duct is not sealed to the first air duct. A locking member is driven to connect with the second connector and is capable of driving the second connector to switch between the locked state and the unlocked state.

2. The duct connection joint according to claim 1, characterized in that, The first connector includes a flange connection structure, the first air duct is disposed on the flange connection structure, the flange connection structure is provided with a first sealing surface, the first sealing surface is used to be installed on the air filling and exhaust device, the first sealing surface is provided with a first sealing element, and the first sealing element is used to seal and connect the first air duct and the air pipe.

3. The duct connection joint according to claim 2, characterized in that, The first sealing surface is provided with an annular groove, which is used to embed the first sealing element.

4. The duct connection joint according to claim 2, characterized in that, The second connector includes a quick-connect structure, the second air duct is disposed on the quick-connect structure, the quick-connect structure is provided with a second sealing element, and the second sealing element is disposed between the flange connection structure and the quick-connect structure; When the locking member drives the second connecting member in the locked state, the quick-connect structure presses the second sealing member onto the flange connection structure, and the second sealing member seals the connection between the first air duct and the second air duct.

5. The duct connection joint according to claim 4, characterized in that, The second seal includes: A sealing body is provided with a sealing connection channel, which is used to seal the connection between the first air duct and the second air duct. A first connecting part is disposed on the sealing body, and the first connecting part is used to seal and connect with the quick connector structure under the drive of the locking member; The second connecting part is disposed on the sealing body and is used for sealing connection with the flange connection structure.

6. The duct connection joint according to claim 5, characterized in that, The quick connector structure is provided with a sealing disc, and the sealing disc is provided with a second sealing surface, which is used to seal and connect with the first connecting part. The flange connection structure is provided with a sealing groove, which is used to seal the connection with the second connection part.

7. The duct connection joint according to claim 4, characterized in that, The locking element includes; A locking body, which is rotatably connected to the quick-connect structure; A limiting mechanism, which is fixedly connected to the flange connection structure; In the locked state, the locking body rotates until it abuts against the limiting mechanism and can no longer rotate. The locking body presses the quick connector structure against the second seal, driving the second seal to press against the flange connection structure. The second seal seals the connection between the first air duct and the second air duct.

8. The duct connection joint according to claim 7, characterized in that, The limiting mechanism includes: The first limiting member is fixedly connected to the flange connection structure. The first limiting member is provided with a pin hole, and a pin is inserted into the pin hole. The second limiting member is fixedly connected to the flange connection structure, and a limiting block is provided on the second limiting member; In the locked state, one end of the locking body abuts against the pin, and the other end abuts against the limiting block.

9. The duct connection joint according to claim 8, characterized in that, The locking component also includes: The first locking block is fixedly connected to the locking body. The first locking block is provided with a first guide ramp, which is used to abut against the pin. The second locking block is fixedly connected to the locking body. The second locking block is provided with a second guide ramp, which is used to abut against the second limiting member.

10. A locomotive rear-end air charging and discharging device, characterized in that, It includes an air inlet connector, an air outlet connector, and at least two duct connection connectors as described in any one of claims 1-9, wherein one of the duct connection connectors is connected to the air inlet connector, and the other of the duct connection connectors is connected to the air outlet connector.

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