A valve stem mounting structure for a hard-seated gate valve

Abstract

The utility model relates to a valve rod mounting structure for a hard seal gate valve with a concealed rod, comprising a valve body, a mounting cylinder, a cover plate, a valve rod, a valve plate, a sliding plate, a pressing plate, a threaded rod and other components; the sliding plate cooperates with the recessed ring of the valve rod to reliably limit the axial position of the valve rod; the sliding plate remains in an outward moving state under the spring force of the spring, facilitating the insertion of the valve rod; the threaded rod drives the moving cross bar, the extruding rod and the pressing plate to work together, causing the sliding plate to synchronously move inward and be clamped into the recessed ring, thus completing the locking and fixing of the valve rod; the rotating structure of the pressing plate cooperates with the supporting protrusion to ensure the stable movement of the sliding plate; the top is provided with a sealing cover and a bearing to realize the rotary support of the valve rod; this structure can quickly complete the installation and disassembly of the valve rod, improve the assembly efficiency and sealing accuracy, and is suitable for the concealed rod gate valve under various working conditions.

Description

Technical Field

[0001] This utility model belongs to the field of gate valve technology, specifically relating to a valve stem mounting structure for a hard-seal gate valve with a concealed stem. Background Technology

[0002] Non-sunken stem hard-seal gate valves are widely used in water supply and drainage, HVAC, gas, chemical and other industrial fields. Their structural feature is that the valve stem does not move up and down with the valve's opening and closing; instead, the valve plate is raised and lowered by the rotation of the valve stem, thus controlling the flow of fluid. In this type of valve, the valve stem is the core transmission component, and the accuracy of its installation and positioning directly affects the reliability of the gate valve's opening and closing, its sealing performance, and its service life.

[0003] In existing technologies, valve stem installation is mostly achieved through manual alignment followed by axial fixing using pins, locating pins, or fasteners. This method is not only cumbersome and involves numerous steps, but it also easily leads to problems such as axial loosening and misalignment of the valve stem during actual use. This results in the valve plate and valve seat not fitting precisely, thus affecting the sealing effect. Furthermore, when repairing or replacing the valve stem, multiple fasteners need to be removed, resulting in low disassembly and assembly efficiency. This is especially true in confined spaces or under high temperature and pressure conditions, where the operation is difficult and seriously affects the equipment's maintenance efficiency.

[0004] In addition, although some structures use elastic elements for auxiliary fixation, they can often only provide preliminary limit for the valve stem and cannot achieve precise locking of its axial position. Furthermore, in actual operation, there are problems such as slippage or uneven force, which further affect the assembly accuracy and long-term stability. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a valve stem mounting structure for a non-rotating hard-seal gate valve. This structure can achieve precise matching between the valve stem and the valve plate, and effectively limit its axial movement while maintaining free rotation, so as to meet the requirements of non-rotating hard-seal gate valves for high-precision transmission and high-reliability sealing.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a valve stem mounting structure for a concealed stem hard seal gate valve, comprising a valve body, the two ends of which are connected to a pipeline via flanges, an mounting cylinder is provided on the upper surface of the valve body, and a cover plate is bolted to the top of the mounting cylinder;

[0007] A valve plate is vertically slidably installed inside the valve body and the mounting cylinder, and a valve stem is vertically rotatably installed at the center of the inner side of the cover plate, with the bottom of the valve stem screwed onto the inner side of the valve plate;

[0008] The cover plate has symmetrical mounting holes on both sides. A sliding plate is horizontally slidably installed inside the mounting holes. A concave ring is provided on the surface of the valve stem. An arc-shaped groove is provided on the side of the two sliding plates that are close to each other. The arc-shaped groove is adapted to the inner circular surface of the concave ring.

[0009] Furthermore, the thickness of the slide plate is the same as the width of the concave ring, the slide plate is provided with a fixing rod, the fixing rod penetrates the outer surface of the cover plate, and an extrusion head is provided at the end of the fixing rod opposite to the slide plate.

[0010] Furthermore, a spring is sleeved on the surface of the fixing rod, and the spring is placed between the outer side of the cover plate and the extrusion head, and the spring applies an outward thrust to the extrusion head.

[0011] Furthermore, mounting blocks are fixed on both sides of the cover plate, and pressure plates are rotatably mounted on the surface of the mounting blocks. The pressure plates are inclined, and the inner side of the pressure plates is in contact with the end of the extrusion head.

[0012] Furthermore, a threaded rod is horizontally rotatably mounted on one side surface of the cover plate, and a movable crossbar is screwed onto the surface of the threaded rod. Both ends of the movable crossbar are symmetrically provided with pressing rods, and the ends of the pressing rods are in contact with the outer surface of the pressure plate.

[0013] Furthermore, support protrusions are provided on both sides of the cover plate, and the extrusion rod passes through the support protrusions.

[0014] Furthermore, a sealing cover is installed on the top of the cover plate, and a bearing adapted to the valve stem is provided on the inner side of the sealing cover. A control handwheel is provided on the top of the valve stem.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] By setting an installation cylinder on the valve body and fixing a cover plate to the top of the installation cylinder with bolts, the valve stem can be inserted into the cover plate from top to bottom and screwed into the middle position of the valve plate. At the same time, by using a sliding plate to cooperate with the valve stem concave ring, the axial position of the valve stem can be reliably limited while allowing the valve stem to rotate freely. This solves the problems of complex valve stem installation structure and unreliable axial positioning in the prior art, and effectively improves the valve assembly accuracy and sealing performance stability.

[0017] By incorporating a sliding locking structure, including a sliding plate, an arc-shaped groove, a concave ring, a fixing rod, and a spring, the sliding plate remains outward when not under force, ensuring uninterrupted valve stem insertion and solving the problem of sliding components easily interfering with valve stem insertion in the initial stages of installation, as is common in traditional structures. Furthermore, the threaded rod drives the moving crossbar, which in turn acts on the pressure plate, causing the pressure plate to rotate and simultaneously engage the sliding plate with the concave ring. This achieves rapid fixing and maintains a locked state through self-locking, effectively improving installation efficiency and ease of operation.

[0018] By setting up a linkage structure of pressure plate, extrusion rod and support protrusion, pressure plate can push slide plate synchronously through extrusion, and extrusion rod can move parallel in the groove of support protrusion to prevent tilting and deviation, thereby ensuring that slide plate applies force evenly and consistently to valve stem concave ring, solving the problem of jamming failure caused by uneven force or assembly deviation in existing structures, and ensuring the transmission accuracy between valve stem and valve plate.

[0019] By installing a sealing cover on the top of the cover plate and integrating a bearing assembly, the valve stem can still achieve low-friction rotation while being axially limited. Combined with the top control handwheel structure, this achieves efficient control of the valve plate's opening and closing actions, while facilitating subsequent disassembly and maintenance. This solves the problems of cumbersome assembly and disassembly and inconvenient operation and maintenance in traditional structures, and improves the overall system's service life and practicality. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 3 This is a schematic diagram of the cover plate and valve stem installation structure of this utility model;

[0023] Figure 4 This is a schematic diagram of the valve stem limiting structure of this utility model;

[0024] Figure 5 This is a schematic diagram of the cover plate structure of this utility model.

[0025] The components represented by each number in the attached diagram are listed below: 1. Valve body; 11. Mounting cylinder; 2. Cover plate; 21. Sealing cover; 22. Mounting hole; 23. Mounting block; 24. Support protrusion; 3. Valve plate; 4. Valve stem; 41. Concave ring; 5. Slide plate; 51. Arc-shaped groove; 52. Fixing rod; 52. Extrusion head; 6. Spring; 7. Pressure plate; 8. Threaded rod; 9. Moving crossbar; 91. Extrusion rod. Detailed Implementation

[0026] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0027] refer to Figures 1-5As shown, a valve stem mounting structure for a concealed stem hard-seal gate valve includes a valve body 1. Both ends of the valve body 1 are connected to pipelines via flanges. The flanges are sealed together by bolts and gaskets. An mounting cylinder 11 is provided on the upper surface of the valve body 1. The mounting cylinder 11 is hollow and has a guide groove inside for guiding the valve plate 3 to move up and down. The top of the mounting cylinder 11 is fixedly connected to a cover plate 2 by multiple bolts. Gaskets are used to seal between the bolts to prevent leakage. The cover plate 2 is a horizontal plate. The cover plate 2 and the mounting cylinder 11 are installed together by positioning holes to ensure coaxiality accuracy. The overall structure enables quick insertion and installation of the valve stem and has a reset function, solving the problems of inconvenient valve stem mounting structure and inaccurate positioning in the prior art.

[0028] A valve plate 3 is vertically slidably installed inside the valve body 1 and the mounting cylinder 11. The valve plate 3 moves up and down to control the flow of fluid. Sealing surfaces are provided on both sides of the valve plate 3 to seal with the valve seat. A valve stem 4 is vertically rotatably installed at the center of the inner side of the cover plate 2. The valve stem 4 is a cylindrical structure with external threads machined on its outer surface. The bottom of the valve stem 4 is screwed into the threaded hole at the center of the inner side of the valve plate 3. After screwing, the valve stem can drive the valve plate to rise and fall. Mounting holes 22 are symmetrically opened on both sides of the cover plate 2. The mounting holes 22 are rectangular through holes for installing sliding locking mechanisms. A sliding plate 5 is horizontally slidably installed inside the mounting holes 22. The sliding plate 5 has a rectangular cross section and is located at a position corresponding to the concave ring 41 of the valve stem 4. The surface of the valve stem 4 is machined with a concave ring 41, which is a circular annular groove. An arc-shaped groove 51 is provided on the side of the two sliding plates 5 that are close to each other. The inner arc surface of the arc-shaped groove 51 is adapted to the inner circular surface of the concave ring 41 to form a limiting fit, which realizes the reliable fixation of the valve stem in the axial direction.

[0029] refer to Figure 2 and Figure 4 As shown, the thickness of the slide plate 5 is the same as the width of the concave ring 41 to ensure that the two slide plates 5 can completely cover the concave ring wall and achieve stable locking after being inserted into the concave ring 41; a fixing rod 52 is fixedly connected to the rear end of the slide plate 5. The fixing rod 52 extends horizontally and penetrates the outer surface of the cover plate 2. A pressing head 53 is provided at the outer end of the fixing rod 52. The pressing head 53 is cylindrical in shape and the end face is arc-shaped to adapt to the inclined pressing of the pressure plate 7. The whole constitutes a sliding positioning unit, which improves the valve stem installation accuracy and the stability of repeated assembly.

[0030] refer to Figure 2 and Figure 4As shown, a spring 6 is sleeved on the surface of the fixing rod 52. The spring 6 is a helical compression spring. The spring 6 is placed in the limiting cavity between the outer side of the cover plate 2 and the extrusion head 53. When the spring 6 is not under force, it applies a stable outward pushing force to the extrusion head 53, thereby keeping the slide plate 5 in an outward state and not interfering with it before the valve stem 4 is inserted. This solves the problem of the sliding part interfering with the insertion of the valve stem in the early stage of assembly in the traditional structure, and improves the smoothness and reliability of the installation operation.

[0031] refer to Figure 3 and Figure 5 As shown, mounting blocks 23 are fixed on both sides of the cover plate 2. The mounting blocks 23 are square blocks and are connected to the cover plate 2 by welding. The upper surface of the mounting blocks 23 is provided with a rotating mounting hole. A round shaft is provided in the mounting hole to support the rotation of the pressure plate 7. The pressure plate 7 is a fan-shaped plate structure. The pressure plate 7 is inclined and its inner side faces the extrusion head 53 and contacts the end of the extrusion head 53. When the pressure plate 7 rotates around the axis under the action of external force, it can squeeze the extrusion head 53 inward, causing the slide plate 5 to produce horizontal displacement. A power transmission path is formed between the pressure plate 7 and the extrusion head 53, which improves the sensitivity and response speed of the slide plate control during assembly.

[0032] refer to Figure 3 and Figure 5 As shown, a threaded rod 8 is horizontally rotatably mounted on one side surface of the cover plate 2. The threaded rod 8 is a cylindrical long rod with a through external thread. A drive knob is provided at one end of the threaded rod 8 for manual position adjustment. A movable crossbar 9 is screwed onto the surface of the threaded rod 8. The movable crossbar 9 is a nut assembly. During the rotation of the threaded rod 8, the movable crossbar 9 moves axially. Both ends of the movable crossbar 9 are symmetrically provided with pressing rods 91. One end of the pressing rod 91 is a flat head that contacts the outer surface of the pressure plate 7. The whole structure forms a multi-point pressing structure, which solves the problem of easy jamming of the slide plate due to single-point force in the traditional structure and improves the stability and reliability of the pressing action.

[0033] refer to Figure 5 As shown, support protrusions 24 are provided on both sides of the cover plate 2. The support protrusions 24 are rectangular protrusions and are vertically installed on the cover plate 2. The support protrusions 24 have grooves for the extrusion rod 91 to pass through. The grooves are slidably engaged with the extrusion rod 91, so that the extrusion rod 91 maintains a parallel movement state during the force process, preventing it from tilting. This achieves stable pressure on the pressure plate 7, enhances the synchronous sliding ability of the slide plate 5, and effectively improves the balance of valve stem axial locking and the consistency of structural response.

[0034] refer to Figure 1 and Figure 2As shown, a sealing cover 21 is installed on the top of the cover plate 2. The sealing cover 21 is a circular cover plate and is fixed to the top of the cover plate 2 with screws. A bearing adapted to the valve stem 4 is provided on the inner side of the sealing cover 21. The bearing is used to provide rotational support for the valve stem and reduce rotational friction resistance. A control handwheel 42 is provided on the top of the valve stem 4. The control handwheel 42 has a multi-spoke structure and is connected to the top end of the valve stem 4. By rotating the handwheel, the valve stem can drive the valve plate to move up and down, thereby completing the opening and closing operation of the non-stalk gate valve. This structural design solves the problem of valve opening and closing failure caused by inaccurate axial positioning and difficult assembly in traditional non-stalk valves, and improves the convenience of maintenance and replacement.

[0035] The working principle of this utility model is as follows: The valve plate 3 is placed in the groove inside the mounting cylinder 11. Then, the cover plate 2 is sealed to the top of the mounting cylinder 11 by bolts. When no force is applied, the spring 6 exerts an outward elastic force on the extrusion head 53, causing the two sliding plates 5 to move outward as a whole. At this time, the two sliding plates 5 will not cause resistance to the installation of the valve stem 4. The valve stem 4 is inserted into the cover plate 2 from top to bottom and gradually rotated into the valve plate 3. When the valve stem 4 is installed in place, the position of the concave ring 41 coincides with the sliding plate 5. At this time, the threaded rod 8 is rotated to control the movement of the moving crossbar 9, causing the moving crossbar 9 to move closer to the cover plate 2. Then, the extrusion rod 91 extrudes the pressure plate 7. The extrusion rod 91 is subjected to... The support of the support protrusion 24 can only slide horizontally to ensure its smooth movement. When the pressure plate 7 is squeezed, it will rotate to squeeze the extrusion head 53, causing the two slide plates 5 to move inward at the same time. At this time, the slide plates 5 will enter the inner side of the concave ring 41 until the arc-shaped groove 51 contacts the inner circle surface of the concave ring 41 to fix the valve stem 4. The self-locking property of the threaded rod 8 is used to keep it fixed. At this time, the axial direction of the valve stem 4 is limited, but the rotation of the valve stem 4 is not affected. This structure can quickly realize the installation and disassembly of the valve stem 4, improve the convenience of assembly and maintenance. At the same time, the axial position of the valve stem 4 is completely fixed after installation to ensure the accuracy of its fit with the valve plate 3.

[0036] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A stem mounting structure for a hard-seated gate valve with a stem, comprising a valve body (1), characterized in that: The valve body (1) is connected to the pipeline through flanges at both ends. An installation cylinder (11) is provided on the upper surface of the valve body (1). A cover plate (2) is installed on the top of the installation cylinder (11) by bolts. A valve plate (3) is vertically slidably installed inside the valve body (1) and the mounting cylinder (11), and a valve stem (4) is vertically rotated and installed at the center of the inner side of the cover plate (2), with the bottom of the valve stem (4) screwed into the inner side of the valve plate (3); The cover plate (2) has symmetrical mounting holes (22) on both sides. A sliding plate (5) is horizontally slidably installed inside the mounting hole (22). A concave ring (41) is provided on the surface of the valve stem (4). An arc-shaped groove (51) is provided on the side of the two sliding plates (5) that are close to each other. The arc-shaped groove (51) is adapted to the inner circular surface of the concave ring (41).

2. A hard-seated gate valve stem mounting structure according to claim 1, characterized in that: The thickness of the slide plate (5) is the same as the width of the concave ring (41). The slide plate (5) is provided with a fixing rod (52). The fixing rod (52) penetrates the outer surface of the cover plate (2). The end of the fixing rod (52) away from the slide plate (5) is provided with an extrusion head (53).

3. The stem mounting structure for a hard-seal gate valve with a concealed stem as described in claim 2, characterized in that: A spring (6) is fitted on the surface of the fixing rod (52). The spring (6) is placed between the outer side of the cover plate (2) and the extrusion head (53). The spring (6) applies an outward thrust to the extrusion head (53).

4. The stem mounting structure for a hard-seal gate valve with a concealed stem according to claim 3, characterized in that: Mounting blocks (23) are fixed on both sides of the cover plate (2). A pressure plate (7) is rotatably mounted on the surface of the mounting block (23). The pressure plate (7) is inclined and the inner side of the pressure plate (7) is in contact with the end of the extrusion head (53).

5. The stem mounting structure for a hard-seal gate valve with a concealed stem according to claim 4, characterized in that: A threaded rod (8) is horizontally and rotatably mounted on one side surface of the cover plate (2). A movable crossbar (9) is screwed onto the surface of the threaded rod (8). A pressing rod (91) is symmetrically arranged at both ends of the movable crossbar (9). The end of the pressing rod (91) is in contact with the outer surface of the pressure plate (7).

6. The stem mounting structure for a hard-seal gate valve with a concealed stem according to claim 5, characterized in that: The cover plate (2) is provided with support protrusions (24) on both sides, and the extrusion rod (91) passes through the support protrusions (24).

7. The stem mounting structure for a hard-seal gate valve with a concealed stem according to claim 1, characterized in that: The top of the cover plate (2) is equipped with a sealing cover (21), and the inner side of the sealing cover (21) is provided with a bearing that is compatible with the valve stem (4). The top of the valve stem (4) is provided with a control handwheel (42).

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