The mating structure between the valve stem and the valve plate

Abstract

A valve stem and valve plate mating structure includes a valve stem and a valve plate. The valve stem has an assembly head at its front end, and the valve plate has an assembly groove corresponding to the assembly head. The assembly head and assembly groove mate to fix the valve stem and valve plate. After the assembly head is inserted into the assembly groove, it rotates at a fixed angle to secure the valve stem and valve plate. The beneficial effects of this invention are: by replacing traditional threaded fasteners with a tenon-and-mortise fixing structure, the assembly difficulty is significantly reduced, avoiding the cumbersome operation of tightening with tools in narrow pipes, thereby reducing the risk of insecure fastening or thread damage and lowering the possibility of leakage; at the same time, this structure simplifies the alignment process, eliminating the need for repeated adjustments, shortening installation time, and reducing human error.

Description

Technical Field

[0001] This utility model relates to an assembly structure, and more particularly to a mating structure between a valve stem and a valve plate. Background Technology

[0002] In valve manufacturing, the assembly of valve stems and valve plates typically employs threaded connections or keyway fastening. Specifically, one end of the valve stem is machined with external threads, while the valve plate has matching internal threaded holes. The assembly process involves precisely inserting the valve stem into the mounting holes on the valve plate, then applying torque using a wrench or special tool to tighten the threads to ensure a secure connection. In some designs, pins or flanges may be used for auxiliary positioning to prevent rotational misalignment. The entire process requires workers to meticulously align the components and perform calibration after tightening to verify that the valve plate's opening and closing angles meet standards, preventing fluid leakage or performance deviations. This assembly method is widely used in industrial valves, such as ball valves or gate valves, and usually requires manual operation in a workshop or field environment, taking approximately 5-10 minutes, and its quality depends heavily on the operator's skill level.

[0003] However, the assembly structure of existing technologies is relatively complex, and problems are particularly prominent in installation scenarios. For example, in confined pipe spaces or high-altitude work environments, workers have difficulty using tools to tighten threads, which can easily lead to insecure fastening or thread damage, increasing the risk of leakage. At the same time, the alignment process is cumbersome, requiring repeated adjustments, which prolongs installation time and may introduce human error. Disassembly and maintenance are equally inconvenient, requiring additional tools and space, which not only reduces efficiency and increases costs but may also delay operations during emergency repairs. Overall, this deficiency limits the applicability of valves in compact or harsh conditions and urgently requires improvement to simplify the process. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a valve stem and valve plate mating structure that solves the problem of complex valve assembly and operation in narrow spaces.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a valve stem and valve plate mating structure, comprising a valve stem and a valve plate, wherein the valve stem has an assembly head at its front end, and the valve plate has an assembly groove corresponding to the assembly head, the assembly head and the assembly groove mating to fix the valve stem and the valve plate, and the assembly head being inserted into the assembly groove and then rotated at a fixed angle to fix the valve stem and the valve plate.

[0006] The beneficial effects of this utility model are as follows: By replacing traditional threaded fasteners with mortise and tenon joints, the assembly difficulty is significantly reduced, avoiding the tedious operation of tightening with tools in narrow pipes, thereby reducing the risk of loose fasteners or thread damage and lowering the possibility of leakage. Simultaneously, this structure simplifies the alignment process, eliminating the need for repeated adjustments, shortening installation time and reducing human error. During disassembly and maintenance, loosening is achieved simply by rotating in the opposite direction, requiring no additional tools or large space, improving efficiency and reducing the risk of delays in emergency repairs. Overall, this design enhances the applicability of valves in compact or harsh conditions and strengthens overall reliability. As a preferred embodiment, the assembly head can be designed with a structure featuring a protruding locking block, while the assembly slot has a matching grooved slide rail. When the assembly head is inserted into the assembly slot, the user manually rotates it to a fixed angle (e.g., 90 degrees), causing the protruding locking block to slide along the slide rail and eventually engage with the end of the groove, achieving fixation through mechanical interlocking. No external tools are required; the working principle is based on the mortise and tenon interlocking principle, ensuring automatic alignment and locking during rotation. As another preferred method, a guide ramp can be integrated into the assembly slot. When the assembly head is inserted, the ramp guides it to be accurately positioned. When rotated, the ramp transforms into a limiting surface to prevent accidental dislodgement. The working principle utilizes the mechanical guidance of the ramp to reduce assembly resistance and improve the success rate on the first attempt.

[0007] It should be noted that the valve stem in this application moves up and down without rotating. Therefore, keyways and protrusions are respectively provided at corresponding positions on the valve stem and valve body (or bracket) to prevent the valve stem from rotating during the lifting process. Combined with the mortise and tenon assembly method between the valve stem and valve plate, this further enhances the connection effect between the valve stem and valve plate.

[0008] Furthermore, the assembly head is provided with a support platform, a connecting rod, a fixing platform, and an insert rod in sequence from the end away from the assembly slot toward the assembly slot. The assembly slot is provided with a limit slot, a through slot, a fixing slot, and a through slot respectively corresponding to the support platform, the connecting rod, the fixing platform, and the insert rod. The insert rod has the smallest outer diameter in the assembly head.

[0009] This structure provides phased assembly guidance. The abutment and limiting groove cooperate to ensure initial positioning accuracy, the connecting rod passes through the through slot to provide axial support, and the fixing platform and fixing groove lock after rotation. The minimum outer diameter of the insert rod facilitates easy insertion in narrow spaces, reducing assembly resistance. This reduces the installation error rate and improves sealing and durability. At the same time, the corresponding components are designed with optimized force distribution to avoid local stress concentration and extend service life. As a preferred option, the insert rod can be designed with a tapered front end, and the through slot is matched with a tapered inlet. During insertion, the tapered front end guides the assembly head to automatically center, reducing manual adjustment. The working principle utilizes the self-centering effect of the tapered surface to ensure that the insert rod enters the through slot smoothly. As another preferred option, the connecting rod adopts a cylindrical structure, and the through slot is a circular channel. During assembly, the cylinder slides in the channel to provide stable guidance. After rotation, the fixing platform and fixing groove engage. The working principle uses the sliding of the cylinder to reduce friction and ensure a smooth transition to the locked state.

[0010] Furthermore, symmetrical limiting ears are provided on both sides of the radial direction of the through groove. The two limiting ears cooperate to form a through groove at the center of the through groove. The shape of the through groove is adapted to the fixed platform. After the fixed platform is rotated at a fixed angle, the two limiting ears cooperate with the two ends of the fixed platform to prevent the assembly head from coming out of the assembly groove.

[0011] This design enhances the reliability of the mounting. The slot allows the mounting platform to pass through unobstructed during insertion. After rotation, the two ends of the mounting platform engage with the limiting ears to form a mechanical barrier, effectively preventing the assembly head from dislodging and improving stability under vibration or high pressure environments. Simultaneously, the symmetrical limiting ears simplify the manufacturing process and ensure uniform force distribution, reducing the risk of wear. As a preferred option, the limiting ears can be designed as concave arc-shaped bosses, with the slot having a rectangular opening. When the mounting platform is inserted, the rectangular opening aligns and passes through. After rotating 90 degrees, the two ends of the mounting platform engage with the concave part of the arc-shaped boss. The working principle is based on the boss locking mechanism, using rotational motion to lock the mounting platform below the ear. As another preferred option, a chamfered bevel is provided at the edge of the slot, with the mounting platform corresponding to a block with rounded corners. During assembly, the chamfered bevel assists the mounting platform in sliding in, and after rotation, the rounded corners smoothly contact the ear. The working principle uses the beveled guide to reduce jamming and ensure a smooth locking process.

[0012] Furthermore, the cross-sectional shape of the limiting ear is arc-shaped.

[0013] The arc-shaped cross-section optimizes the contact area and stress distribution. The arc-shaped surface provides uniform bearing capacity, reduces local stress concentration, and prevents ear breakage or deformation. Simultaneously, the arc design facilitates sliding contact during assembly head rotation, reducing frictional noise and wear, and extending component life. This enhances the overall structural durability and maintenance convenience. As a preferred option, the arc-shaped cross-section can be designed as a continuous curved protrusion, fixed to the inner wall of the assembly slot. When the fixing platform rotates, the curved protrusion forms surface contact with the edge of the fixing platform. The working principle utilizes the arc surface to distribute the load, preventing fatigue failure caused by point contact. As another preferred option, the arc-shaped ear integrates reinforcing ribs to increase structural rigidity. During assembly, the ribs guide the rotation trajectory, ensuring precise locking. The working principle enhances the ear's bending resistance through the ribs, adapting to high-pressure conditions.

[0014] Furthermore, the fixed angle is 90 degrees.

[0015] The 90-degree fixed angle design simplifies the operation process; users only need to rotate a quarter turn once to lock, making it intuitive and easy to control, reducing training requirements. Simultaneously, the 90-degree angle ensures a clear locking position, preventing loosening caused by over-rotation or under-rotation, improving assembly consistency and reliability. In emergency disassembly, a reverse 90-degree rotation allows for quick release, improving maintenance efficiency. As a preferred method, the fixed angle is achieved by aligning the marking line on the assembly head with the indicator groove of the assembly slot; the rotation automatically stops when the marking line aligns with the indicator groove, utilizing visual alignment for precise positioning. As another preferred method, a mechanical stop is installed within the assembly slot; the fixed table rotates 90 degrees and touches the stop to lock. During assembly, the stop provides a physical stop point, ensuring accurate angle through stop limiting, eliminating the need for additional measurements. Attached Figure Description

[0016] Figure 1 This is an overall structural diagram of the valve stem and valve plate after they are fitted together according to an embodiment of this utility model;

[0017] Figure 2 This is a schematic diagram of the assembly head in an embodiment of the present invention;

[0018] Figure 3 This is a front view of the assembly slot in an embodiment of the present invention;

[0019] Figure 4 This is a cross-sectional view of the valve stem and valve plate after they are fitted together in an embodiment of this utility model. Detailed Implementation

[0020] An embodiment of this utility model provides a valve stem and valve plate mating structure as follows: Figure 1-4As shown: The valve includes a valve stem 1 and a valve plate 2. The valve stem 1 has an assembly head 11 at its front end, which is used to fix it to the valve plate 2. From the end furthest from the assembly groove 21 towards the assembly groove 21, the assembly head 11 has, in sequence, a stop platform 111, a connecting rod 112, a fixing platform 113, and an insertion rod 114, where the insertion rod 114 has the smallest outer diameter for easy insertion during the assembly process. The valve plate 2 has an assembly groove 21 corresponding to the assembly head 11. The assembly groove 21 includes a limiting groove 211, a through groove 212, a fixing groove 213, and a through groove 214, which respectively cooperate with the stop platform 111, connecting rod 112, fixing platform 113, and insertion rod 114 of the assembly head 11. Symmetrical limiting ears 2121 are provided on both radial sides of the through groove 212. The two limiting ears 2121 cooperate to form a through groove 2122. The shape of the through groove 2122 is adapted to the fixing platform 113. The cross-sectional shape of the limiting ears 2121 is arc-shaped to enhance structural strength. The fixing angle is set to 90 degrees to ensure stable fixation after assembly. In this structure, the original fastener fixing method has been improved to a mortise and tenon-like structure, which simplifies the assembly process and reduces manufacturing difficulty.

[0021] During assembly, the insertion rod 114 of the assembly head 11 is first inserted into the through slot 214 of the assembly groove 21, pushing the valve stem 1 so that the fixed platform 113 passes through the through slot 2122. Then, the valve stem 1 is rotated at a fixed angle of 90 degrees, causing the fixed platform 113 to rotate to a position that mates with the limiting ear 2121. At this point, both ends of the fixed platform 113 are held in place by the limiting ear 2121, preventing the assembly head 11 from coming out. Simultaneously, the platform 111 contacts the limiting slot 211 to provide support, and the connecting rod 112 is positioned within the through slot 212 to ensure alignment. Finally, the valve stem 1 and the valve plate 2 are securely fixed. This working principle avoids the complex operations associated with traditional fasteners and improves assembly efficiency.

[0022] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A valve stem and valve plate mating structure, comprising a valve stem and a valve plate, wherein the valve stem has an assembly head at its front end, and the valve plate has an assembly groove corresponding to the assembly head, the assembly head and the assembly groove mating to fix the valve stem and the valve plate, characterized in that: After the assembly head is inserted into the assembly slot, it rotates at a fixed angle to fix the valve stem and the valve plate. The assembly head is provided with a support platform, a connecting rod, a fixing platform and an insert rod in sequence from the end away from the assembly slot toward the assembly slot. The assembly slot is provided with a limit groove, a through groove, a fixing groove and a through groove respectively corresponding to the support platform, the connecting rod, the fixing platform and the insert rod. The insert rod is the smallest in outer diameter among the assembly heads.

2. The valve stem and valve plate interface of claim 1, wherein: The through slot is symmetrically provided with limiting ears on both sides of the radial direction. The two limiting ears cooperate to form a through slot at the center of the through slot. The shape of the through slot is adapted to the fixed platform. After the fixed platform is rotated at a fixed angle, the two limiting ears cooperate with the two ends of the fixed platform to prevent the assembly head from coming out of the assembly slot.

3. The valve stem and valve plate interface of claim 2, wherein: The cross-sectional shape of the limiting ear is bow-shaped.

4. The valve stem and valve plate interface of claim 1, wherein: The fixed angle is 90 degrees.

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