A valve stem with a sealing structure

Abstract

The utility model discloses a valve stem with sealing structure is provided with valve gate, relates to valve technical field. The valve stem with valve gate includes valve body, mounting seat, valve core, valve rod, cover, adjusting sleeve, rubber cover, movable ring and spring etc. component, and the valve rod is arranged in the mounting seat and is inserted with the valve core and is connected, and the rubber cover is covered in the valve rod lower extreme and is formed with the conical block cooperation expansion type sealing structure, and the movable ring is arranged in the rubber cover upper end, and the spring is pressed tightly movable ring to push the rubber cover and realizes the sealing, adjusting sleeve passes through the cover and is opposite with the spring, and realizes the sealing force adjustment through the screwing adjustment, this structure can realize the continuous compensation of sealing performance, and is convenient for maintenance and replacement. The compact structure of the device, the reliable sealing, solve the traditional valve rod sealing effect attenuation after the adjustment difficult, maintenance complex etc. problem.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a valve stem with a self-sealing structure. Background Technology

[0002] As a crucial transmission component of a valve, the valve stem primarily connects the valve actuator to the valve core. Its rotational or linear motion drives the valve core, enabling the opening, closing, or regulation of the fluid medium. Under most operating conditions, the valve stem must not only possess good mechanical strength and corrosion resistance but also ensure a tight seal with the valve body to prevent media leakage and guarantee the safety and stability of valve operation.

[0003] In existing technologies, valve sealing largely relies on auxiliary sealing components such as packing, sealing rings, or glands placed between the valve body and stem. These structures typically require high machining precision and are prone to wear or loosening of the seals after long-term operation, leading to a decline in sealing performance. Especially when seals age or their clamping force weakens, it often requires disassembling the entire top cover structure or packing assembly for replacement or adjustment, resulting in cumbersome operations, low maintenance efficiency, and unsatisfactory seal recovery. Furthermore, some sealing structures cannot achieve continuous and effective sealing compensation under pressure, and their sealing performance deteriorates significantly over time, increasing the risk of leakage.

[0004] In summary, the following technical problems still exist in the sealing structure of existing valve stems that urgently need to be solved: First, it is impossible to achieve automatic or continuous compensation of the sealing structure, resulting in the sealing effect decaying over time; second, when the sealing performance deteriorates, adjustment or maintenance is inconvenient, requiring the disassembly of multiple components, which increases the complexity of operation; third, once the sealing structure fails, the sealing performance cannot be restored without replacing all sealing components, resulting in high maintenance costs and low efficiency. 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 with a self-sealing structure. This valve stem has a simple structure, reliable sealing performance, and can achieve automatic compensation and convenient adjustment, thereby improving its sealing durability and maintenance convenience, and solving the problems existing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A valve stem with a self-sealing structure includes a valve body, a mounting base, and a valve stem. The mounting base is fixed to the upper end of the valve body, and a valve core is installed inside the valve body. The lower end of the valve stem passes through the mounting base and can be inserted and engaged with the valve core. The upper end of the valve stem is fixed with a rotating handle, and the valve stem can drive the valve core to rotate when it rotates.

[0008] A conical block is fixed near the lower end of the valve stem, and a rubber sleeve, a movable ring, and a spring are sequentially fitted on the upper side of the valve stem above the conical block. The lower end of the rubber sleeve is flared.

[0009] The upper end of the mounting base is fixed with a cover, and an adjustment sleeve for adjusting the tension of the spring is installed on the cover.

[0010] Furthermore, a baffle is fixed to the lower end of the valve stem, and a square plug is fixed to the center of the lower side of the baffle.

[0011] Furthermore, a square head that passes through the handle is fixed to the upper end of the valve stem, and a threaded head for tightening the nut is fixed to the upper end of the square head.

[0012] Furthermore, the upper end of the valve core is fixed with a frustum that is snapped into the mounting base, and the upper end of the frustum has a socket that mates with the square plug.

[0013] Furthermore, the valve body has a valve cavity for installing the valve core on its inner side, and an opening communicating with the valve cavity is provided at the upper end of the valve body, with a stepped groove at the opening.

[0014] Furthermore, a mounting plate is fixed to the outer side of the mounting base near the lower end, and a retaining plate that is locked in the stepped groove is fixed to the lower end of the mounting base. The mounting plate is fixed to the valve body with screws.

[0015] Furthermore, the inner side of the mounting base has a through mounting cavity, the inner diameter of which is the same as the diameter of the rubber sleeve, the movable ring, the baffle, and the frustum.

[0016] Furthermore, the adjusting sleeve extends vertically through the center of the cover, and external threads are provided on the outer side of the adjusting sleeve. An anti-slip ring is fixed on the outer side of the adjusting sleeve near the upper end.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This structure forms an active sealing assembly by combining a rubber sleeve, a movable ring, and a spring on the outside of the valve stem. The lower end of the flared end of the rubber sleeve is fitted with a conical block, which generates radial expansion under the long-term elastic action of the spring, achieving a reliable seal on the inner wall of the mounting cavity. This effectively solves the problem of the inability to continuously maintain the sealing force in traditional valve stem structures, and improves the sealing stability and reliability.

[0019] This device introduces an adjustment sleeve structure. By turning the external thread on the adjustment sleeve in conjunction with the screw hole of the cover, the clamping force of the spring on the movable ring can be controlled, thereby dynamically adjusting the sealing force. Even when the rubber sleeve is worn or the spring force decreases, the sealing effect can still be restored through external adjustment, overcoming the problems of non-adjustable sealing force and the need to disassemble and replace the machine when the seal fails in the existing technology.

[0020] This structure enables quick connection between the valve stem and valve core by using a baffle, a square plug, and a socket. This not only facilitates installation and positioning but also makes it easier to disassemble and replace the valve stem assembly later. It avoids the problem of complicated maintenance caused by the need for complete disassembly when replacing the seal, thus improving maintenance efficiency and convenience.

[0021] The mounting base has a through mounting cavity whose dimensions are strictly matched with the rubber sleeve, movable ring, baffle and truncated cone, ensuring that the sealing components slide in smoothly and fit tightly during assembly. At the same time, the stepped groove cooperates with the retaining plate to achieve precise positioning of the mounting base, improve the stability of the overall component and effectively solve the problem of loose seal caused by poor installation in traditional structures.

[0022] The anti-slip ring is located on the upper outer side of the adjusting sleeve and adopts an anti-slip structure design, which improves the convenience and safety of the adjustment operation. It enables precise adjustment even in environments with limited pipeline assembly space or oil contamination, further improving the controllability and practicality of maintenance operations. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the present invention;

[0024] Figure 2 This is a schematic diagram of the valve core of this utility model;

[0025] Figure 3 This is a schematic diagram of the adjusting sleeve of this utility model;

[0026] Figure 4 This is a schematic diagram of the valve core of this utility model;

[0027] Figure 5 This is a schematic diagram of the valve body of this utility model;

[0028] Figure 6 This is a schematic diagram of the mounting base of this utility model.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Valve body; 11. Valve cavity; 12. Step groove; 2. Mounting seat; 21. Mounting plate; 22. Clamping platform; 23. Mounting cavity; 3. Cover; 4. Rotary handle; 5. Valve stem; 51. Threaded head; 52. Square head; 53. Spring; 54. Moving ring; 55. Rubber sleeve; 56. Conical block; 57. Baffle; 58. Square plug; 6. Adjusting sleeve; 61. Anti-slip ring; 62. External thread; 7. Valve core; 71. Frustum; 72. Insertion hole. Detailed Implementation

[0031] 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.

[0032] like Figure 1 and Figure 2 As shown, a valve stem with a self-sealing structure includes a valve body 1, a mounting base 2, and a valve stem 5. The mounting base 2 is fixedly connected to the upper end of the valve body 1 and is firmly positioned with the valve body 1 by screws, enhancing the overall stability of the structure. A valve core 7 for controlling the opening and closing of fluid is installed on the inner side of the valve body 1. The valve core 7 can rotate around its axis to realize the opening and closing function of the valve. The lower end of the valve stem 5 passes through the mounting base 2 and can be inserted into the valve core 7. The insertion structure ensures transmission stability and positioning reliability. A handle 4 for manual driving is fixedly connected to the upper end of the valve stem 5. The rotation of the handle 4 drives the valve stem 5 to rotate around its axis, thereby realizing the synchronous rotation of the valve core 7 and completing the opening and closing operation of the valve. In this structure, the combination of rotating parts and sealing structure effectively improves the sealing performance and operational stability of the valve assembly.

[0033] A conical block 56 is fixed near the lower end of the valve stem 5. The outer periphery of the conical block 56 has an outwardly expanding conical structure, with the conical surface facing downwards, and it serves as a sealing and pushing component to compress the rubber sleeve 55, causing its outer diameter to expand. Above the conical block 56, the valve stem 5 is fitted with a rubber sleeve 55, a movable ring 54, and a spring 53 in sequence. The rubber sleeve 55 is made of wear-resistant rubber, with a hollow cylindrical outer wall and an inner cavity that fits snugly against the outer wall of the valve stem 5. The lower end of the rubber sleeve 55 has a flared outer edge, which, when pressed in conjunction with the conical block 56, allows for radial expansion. The expansion allows for efficient sealing against the inner wall of the mounting cavity 23. The movable ring 54 is a ring-shaped metal component, with its lower surface in contact with the upper end face of the rubber sleeve 55, and its upper surface elastically compressed by the spring 53. The spring 53 adopts a helical compression spring structure, is vertically arranged and placed between the movable ring 54 and the adjusting sleeve 6, and is used to achieve long-term elastic compression of the rubber sleeve 55, thereby completing the sealing force compensation. This sealing structure can maintain a sealing state even when the rubber sleeve 55 is deformed due to wear, and has excellent automatic compensation capability.

[0034] A cover 3 is fixed to the upper end of the mounting base 2. The cover 3 is a cylindrical cover plate structure, which is fitted onto the outside of the valve stem 5 and covers the top of the mounting base 2. The cover 3 has a central hole for the adjustment sleeve 6 to pass through and support it. After the bottom surface of the cover 3 contacts the mounting base 2, it is fixed by screws or buckles, thus forming a complete closed sealing cavity. An adjustment sleeve 6 for adjusting the tension of the spring 53 is installed on the cover 3. The adjustment sleeve 6 changes its downward position by rotating, thereby adjusting the spring 53 by pressing or loosening it. This structure controls the sealing force at the lower end by adjusting the upper end, which can effectively solve the problem of difficulty in maintenance and adjustment after the sealing performance deteriorates, as mentioned in the background art.

[0035] like Figure 2 As shown, a baffle 57 is fixed to the lower end of the valve stem 5. The baffle 57 has a disc-shaped structure and is used to block the axial displacement of sealing components such as the rubber sleeve 55, the movable ring 54, and the spring 53. At the same time, it provides a lower boundary for limiting and sealing force. A square plug 58 is fixed to the center of the lower side of the baffle 57. The square plug 58 is connected to the baffle 57 by an integral casting process and is used to be inserted into the socket 72 at the upper end of the valve core 7 to realize the transmission connection between the valve stem 5 and the valve core 7.

[0036] like Figure 2 As shown, a square head 52 passing through the handle 4 is fixed at the upper end of the valve stem 5. The square head 52 has a square cross-section and is used to tightly fit with the inner hole of the handle 4 to transmit torque. A threaded head 51 for tightening nuts is fixed at the upper end of the square head 52. The threaded head 51 has a standard thread on its outer circumference, which can be used to tighten the nuts and realize the connection and fixation with external actuators or drive components, further improving the structural stability.

[0037] like Figure 4 As shown, the upper end of the valve core 7 is fixed with a frustum 71 that is locked in the mounting base 2. The frustum 71 has an outer conical structure, and its outer diameter is tightly fitted with the lower inner wall of the mounting cavity 23 of the mounting base 2 to achieve axial positioning. The upper center of the frustum 71 has a socket 72 that mates with the square plug 58. The socket 72 is a square cavity with dimensions that match the square plug 58. It is used to achieve a stable plug-in connection between the valve stem 5 and the valve core 7, so that the valve core 7 can rotate synchronously when the valve stem 5 rotates.

[0038] like Figure 5 As shown, the valve body 1 has a valve cavity 11 for mounting the valve core 7 on its inner side. The valve cavity 11 is a cylindrical through cavity structure, and its size matches that of the valve core 7. It is used to accommodate and restrict the rotation space of the valve core 7. The upper end of the valve body 1 has an opening that communicates with the valve cavity 11. The opening has a stepped groove 12 for limiting the mounting seat 2. The stepped groove 12 is an annular stepped structure, which can achieve circumferential positioning and vertical limiting of the mounting seat 2's locking platform 22.

[0039] like Figure 6As shown, a mounting plate 21 is fixed to the outer side of the mounting base 2 near its lower end. The mounting plate 21 is a plate-shaped structure with through holes at both ends. It is rigidly connected to the valve body 1 by screws, which enhances the overall rigidity of the valve assembly in the pipeline connection. A retaining platform 22 is fixed to the lower end of the mounting base 2 and is inserted into the stepped groove 12. The retaining platform 22 is an annular boss structure that cooperates with the stepped groove 12 to limit and fix the mounting base 2 on the valve body 1. The dual fixing method of the mounting plate 21 and the retaining platform 22 effectively solves the problem of loosening of the seal due to vibration in the prior art.

[0040] like Figure 6 As shown, the mounting base 2 has a through mounting cavity 23 on its inner side. The inner wall of the mounting cavity 23 is a smooth cylindrical surface, and its inner diameter is consistent with the diameter of the rubber sleeve 55, the movable ring 54, the baffle 57 and the frustum 71, thereby ensuring that the above components can be smoothly installed in the cavity and achieve a sealed fit and rotational engagement. The mounting cavity 23 is a through structure, which makes the assembly and disassembly of the above components more convenient and facilitates later maintenance and replacement.

[0041] like Figure 3 As shown, the adjusting sleeve 6 vertically penetrates the center of the cover 3. The lower end of the adjusting sleeve 6 presses against the spring 53, and the upper end is driven by an external drive to achieve height adjustment. The outer side of the adjusting sleeve 6 is provided with an external thread 62 that mates with the thread on the inner wall of the cover 3. The external thread 62 is used to adjust the axial movement position of the adjusting sleeve 6 in the cover 3, thereby controlling the pressing force on the spring 53. An anti-slip ring 61 is fixed on the outer side of the adjusting sleeve 6 near the upper end. The anti-slip ring 61 is made of anti-slip textured rubber material, and has several protrusions on its outer edge to facilitate manual screwing without slipping, ensuring the stability and safety of the adjustment process.

[0042] The working principle of this utility model is as follows: When installing the valve stem 5, the rubber sleeve 55, the movable ring 54 and the spring 53 are sequentially fitted onto the valve stem 5, and then the valve stem 5 is installed into the inner side of the mounting cavity 23, so that the square plug 58 is inserted into the inner side of the socket 72, thereby completing the connection between the valve stem 5 and the valve core 7, which is also beneficial for the disassembly and replacement of the valve stem 5 in the later stage.

[0043] After the valve stem 5 is installed, the cover 3 and the adjusting sleeve 6 are put on the valve stem 5, and then the cover 3 is fixed to the upper end of the mounting base 2. At this time, the adjusting sleeve 6 presses the spring 53, and the spring 53 presses the movable ring 54 downward elastically. The elastically pressed movable ring 54 presses the rubber sleeve 55 downward. At this time, the rubber sleeve 55 expands outward by the sleeve fit of the flared mouth and the conical block 56 to achieve a sealing fit with the inner wall of the mounting cavity 23. When the rubber sleeve 55 wears, under the continuous elastic compression of the spring 53, the rubber sleeve 55 can continue to expand, thereby performing sealing compensation and effectively ensuring the sealing performance of the valve stem 5 installation.

[0044] When the spring 53 has insufficient elasticity or the sealing effect of the rubber sleeve 55 deteriorates, the adjusting sleeve 6 can be screwed on by the anti-slip ring 61 to tighten the spring 53, thereby increasing the elastic pressure of the spring 53 and further ensuring the continuous elastic compression of the rubber sleeve 55 and ensuring the sealing performance.

[0045] 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 valve stem with a self-sealing structure, comprising a valve body (1), a mounting base (2), and a valve stem (5), characterized in that: The mounting base (2) is fixed on the upper end of the valve body (1). A valve core (7) is installed on the inner side of the valve body (1). The lower end of the valve stem (5) passes through the mounting base (2) and can be inserted into the valve core (7). A handle (4) is fixed on the upper end of the valve stem (5). When the valve stem (5) rotates, it can drive the valve core (7) to rotate. The valve stem (5) is fixed with a conical block (56) near its lower end, and the valve stem (5) is fitted with a rubber sleeve (55), a movable ring (54) and a spring (53) in sequence on the upper side of the conical block (56). The lower end of the rubber sleeve (55) is flared. The upper end of the mounting base (2) is fixed with a cover (3), and an adjusting sleeve (6) for adjusting the tension of the spring (53) is installed on the cover (3).

2. The valve stem with a self-sealing structure according to claim 1, characterized in that: A baffle (57) is fixed to the lower end of the valve stem (5), and a square plug (58) is fixed to the lower center of the baffle (57).

3. The valve stem with a self-sealing structure according to claim 2, characterized in that: The upper end of the valve stem (5) is fixed with a square head (52) that passes through the handle (4), and the upper end of the square head (52) is fixed with a threaded head (51) for tightening the nut.

4. A valve stem with a self-sealing structure according to claim 2, characterized in that: The upper end of the valve core (7) is fixed with a frustum (71) that is locked in the mounting base (2), and the upper end of the frustum (71) is provided with a socket (72) that mates with the square plug (58).

5. A valve stem with a self-sealing structure according to claim 4, characterized in that: The valve body (1) has a valve cavity (11) for installing the valve core (7) on its inner side, and the upper end of the valve body (1) has an opening that communicates with the valve cavity (11), and a stepped groove (12) is provided at the opening.

6. A valve stem with a self-sealing structure according to claim 5, characterized in that: A mounting plate (21) is fixed on the outer side of the mounting base (2) near the lower end, and a locking platform (22) is fixed at the lower end of the mounting base (2) in the step groove (12). The mounting plate (21) is fixed to the valve body (1) with screws.

7. A valve stem with a self-sealing structure according to claim 6, characterized in that: The mounting base (2) has an upper and lower through mounting cavity (23) on its inner side. The inner diameter of the mounting cavity (23) is the same as the diameter of the rubber sleeve (55), the movable ring (54), the baffle (57) and the frustum (71).

8. A valve stem with a self-sealing structure according to claim 1, characterized in that: The adjusting sleeve (6) penetrates vertically through the center of the cover (3), and the outer side of the adjusting sleeve (6) is provided with an external thread (62). An anti-slip ring (61) is fixed on the outer side of the adjusting sleeve (6) near the upper end.

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