A spline valve stem

Abstract

This invention provides a splined valve stem, comprising a shaft, a valve shaft head, a connecting spline structure, and a valve shaft drive unit. The shaft includes a main shaft and an adjusting shaft. A height adjustment groove is formed at the lower end of the main shaft, and the upper part of the adjusting shaft is inserted into the height adjustment groove. Fixing devices are symmetrically arranged at the lower outer side of the main shaft. The connecting spline structure is sleeved on the outer side of the adjusting shaft. Adjusting holes are formed on the adjusting shaft, with multiple holes evenly distributed from top to bottom. The adjusting shaft and the main shaft are fixedly connected by the fixing devices. The valve shaft drive unit is fixedly located at the upper end of the main shaft, and the valve shaft head is located at the lower end of the adjusting shaft. The valve shaft head is fixedly connected to the adjusting shaft by fixing bolts. This invention allows for flexible length adjustment via the adjusting shaft; simultaneously, the detachable spline structure allows for individual spline replacement, reducing maintenance costs and improving the valve stem's adaptability and service life.

Description

Technical Field

[0001] This utility model relates to the field of valve stem technology, and in particular to a splined valve stem. Background Technology

[0002] As the core transmission component of a valve, the valve stem plays a crucial role in transmitting opening and closing torque and controlling the lifting or rotation of the valve core. Its structural design directly affects the valve's operating accuracy, load-bearing capacity, and service life.

[0003] The prior art discloses a splined valve stem with application number 201220743453.X, belonging to the field of valve technology. It includes a valve stem head, a valve stem middle section, a valve stem root, and a connecting actuator end. The valve stem head and valve stem middle section are sequentially arranged at the front end of the valve stem root, and the actuator end is fixedly connected at the rear end of the valve stem root. A spline is arranged on the outer side of the valve stem middle section. The advantages of this invention are: the rolled spline can be directly connected to the valve plate, eliminating the trouble of making pin holes and installing flat keys, and improving assembly efficiency. However, the prior art still has the problem that the spline and valve stem body are integrally molded. If the spline teeth are worn, deformed, or corroded, the entire valve stem needs to be replaced, and the spline component cannot be replaced separately. At the same time, the splined valve stem is an integrated structure with a fixed length after leaving the factory. When the valve installation scenario changes (such as adjusting the pipeline depth or needing to compensate for height after valve core wear), the entire valve stem needs to be replaced to adapt. Therefore, we propose a splined valve stem to solve the above problems. Utility Model Content

[0004] To address the shortcomings mentioned above, this utility model provides a splined valve stem whose length can be flexibly adjusted by adjusting the shaft; at the same time, it adopts a detachable spline structure, which allows for individual spline replacement, reduces maintenance costs, and improves the adaptability and service life of the valve stem.

[0005] To solve the above problems, the technical solution provided by this utility model is as follows:

[0006] A splined valve stem includes a shaft, a valve shaft head, a connecting spline structure, and a valve shaft drive unit. The shaft includes a main shaft and an adjusting shaft. The lower end of the main shaft has a height adjustment groove, and the upper part of the adjusting shaft is inserted into the height adjustment groove. Fixing devices are symmetrically arranged on the lower outer side of the main shaft. The connecting spline structure is sleeved on the outer side of the adjusting shaft. The adjusting shaft has adjusting holes, which are located at the upper end of the connecting spline structure. Multiple adjusting holes are evenly distributed from top to bottom. The adjusting shaft and the main shaft are fixedly connected by the fixing devices. The valve shaft drive unit is fixedly located at the upper end of the main shaft, and the valve shaft head is located at the lower end of the adjusting shaft. The valve shaft head is fixedly connected to the adjusting shaft by fixing bolts.

[0007] Furthermore, the fixing device includes an outer frame, a fixing block, an adjusting block, a connecting rod, a spring, and a sliding plate. The connecting rod movably passes through the outer frame. One end of the connecting rod is fixedly connected to the adjusting block, and the other end of the connecting rod is fixedly connected to the fixing block. The fixing block matches the adjusting hole. The outer frame is fixedly connected to the outer wall of the main shaft. The spring and the sliding plate are disposed inside the outer frame. The spring is sleeved on the outside of the connecting rod. One end of the spring is fixedly connected to the inner wall of the outer frame, and the other end of the spring is fixedly connected to the sliding plate. The sliding plate is slidably connected to the inner wall of the outer frame.

[0008] Furthermore, the connecting spline structure includes a spline sleeve, a spline connecting rod, and a spline connecting block. The inner wall of the spline sleeve is connected to the outer side of the adjusting shaft. The adjusting shaft has a spline connecting rod mounting groove that matches the spline connecting rod, and a spline connecting block mounting groove that matches the spline connecting block.

[0009] Furthermore, a bolt hole is provided at the lower end of the adjusting shaft.

[0010] Furthermore, a polytetrafluoroethylene guide bushing is fitted to the inner wall of the height adjustment groove of the main shaft.

[0011] Furthermore, the outer side of the adjusting block of the fixing device is provided with anti-slip texture.

[0012] Furthermore, the surface of the spline sleeve is coated with a 0.15-0.25mm thick tungsten carbide wear-resistant coating, and the coating surface is mirror polished.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. Adjustable length and high adaptability: The valve stem length can be flexibly adjusted through the "main spindle + adjusting spindle" and multiple sets of adjusting holes and fixing devices to adapt to different installation scenarios without the need to replace the entire rod.

[0015] 2. Splines can be replaced individually, resulting in low maintenance costs: The spline connection structure is detachable, so when a spline component is damaged, there is no need to replace the entire valve stem; only the corresponding component needs to be replaced, reducing operation and maintenance expenses.

[0016] 3. Stable adjustment, smooth transmission, and high reliability: PTFE bushings reduce friction and aid adjustment, spring fixing prevents deviation, and tungsten carbide coated spline sleeves are wear-resistant, ensuring precise and stable operation.

[0017] In summary, this type of splined valve stem has wide applicability, addressing the issues raised in the background section regarding the existing technology where the spline and valve stem body are integrally molded. If the spline teeth show wear, deformation, or corrosion, the entire valve stem must be replaced, making it impossible to replace the spline component separately. Furthermore, the splined valve stem is an integrated structure with a fixed length after factory manufacture. When the valve installation scenario changes (such as adjusting pipeline depth or needing height compensation after valve core wear), the entire valve stem must be replaced to adapt. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a bottom view schematic diagram of the adjusting shaft of this utility model;

[0020] Figure 3 This is a bottom view of the spline connection structure of this utility model;

[0021] Figure 4 This is a structural schematic diagram of the fixing device of this utility model.

[0022] Explanation of key component symbols:

[0023] 1-Main spindle bar, 101-Height adjustment groove, 2-Adjusting shaft bar, 201-Adjusting insertion hole, 202-Spline connecting rod mounting groove, 203-Spline connecting block mounting groove, 204-Bolt hole, 3-Valve shaft head, 4-Connecting spline structure, 401-Spline sleeve, 402-Spline connecting rod, 403-Spline connecting block, 5-Valve shaft drive unit, 6-Fixing device, 601-Outer frame, 602-Fixing insertion block, 603-Adjusting block, 604-Connecting rod, 605-Spring, 606-Slide plate, 7-Fixing bolt. Detailed Implementation

[0024] To make the objectives, technical solutions and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and examples, but the examples given are not intended to limit the present utility model.

[0025] like Figures 1-4 As shown, the embodiment of this utility model includes a shaft, a valve shaft head 3, a connecting spline structure 4, and a valve shaft drive part 5.

[0026] The valve stem adopts a segmented design, consisting of a main shaft 1 and an adjusting shaft 2. This segmented structure provides a flexible basis for subsequent height adjustment. The lower end of the main shaft 1 has a height adjustment groove 101, and the upper part of the adjusting shaft 2 can be inserted into the height adjustment groove 101. By changing the insertion depth, the overall height of the valve stem can be adjusted. To improve the smoothness and wear resistance during adjustment, a polytetrafluoroethylene (PTFE) guide bushing is fitted to the inner wall of the height adjustment groove 101 of the main shaft 1. PTFE not only has an extremely low coefficient of friction, reducing frictional wear between the adjusting shaft 2 and the inner wall of the height adjustment groove 101 and extending the service life of the components, but also has excellent corrosion resistance, adapting to various complex media environments and preventing adjustment jamming due to media corrosion.

[0027] A fixing device 6 is symmetrically arranged on the lower outer side of the main spindle 1 to fix the relative position of the main spindle 1 and the adjusting spindle 2 after the height adjustment is completed. The adjusting spindle 2 has an adjusting socket 201, which is located at the upper end of the connecting spline structure 4. Multiple adjusting sockets 201 are evenly distributed from top to bottom, providing multiple options for fixing at different heights to meet the height requirements under different working conditions. In addition, a bolt hole 204 is provided at the lower end of the adjusting spindle 2 for connecting to the valve shaft head 3. The adjusting spindle 2 also has a spline connecting rod mounting groove 202 and a spline connecting block mounting groove 203, which match the spline connecting rod 402 and spline connecting block 403 of the connecting spline structure 4, respectively, to ensure the stable assembly of the connecting spline structure 4 and the adjusting spindle 2.

[0028] The fixing device 6 is a key component for fixing the height of the main spindle 1 and the adjusting spindle 2. Its structure includes an outer frame 601, a fixing block 602, an adjusting block 603, a connecting rod 604, a spring 605, and a sliding plate 606. The outer frame 601 is fixedly connected to the outer wall of the main spindle 1, providing installation support for the entire fixing device. The connecting rod 604 moves through the outer frame 601, with one end fixedly connected to the adjusting block 603 and the other end fixedly connected to the fixing block 602. The fixing block 602 matches the adjusting socket 201, and the two are fixed by inserting it into the adjusting socket 201. To facilitate manual adjustment by the operator, the adjusting block 603 of the fixing device 6 has anti-slip textures on its outer side, increasing the friction between the hand and the adjusting block 603, preventing slippage during adjustment, and improving operational convenience.

[0029] The outer frame 601 contains a spring 605 and a sliding plate 606. The spring 605 is sleeved on the outside of the connecting rod 604, with one end fixedly connected to the inner wall of the outer frame 601 and the other end fixedly connected to the sliding plate 606. The sliding plate 606 is slidably connected to the inner wall of the outer frame 601. The elasticity of the spring 605 provides a continuous preload to the fixing block 602, ensuring that the fixing block 602 is not easily loosened after being inserted into the adjusting socket 201, thus improving the stability of the fixation. At the same time, when the height needs to be adjusted, simply pull the adjusting block 603, which will cause the sliding plate 606 to compress the spring 605 through the connecting rod 604, thereby pulling the fixing block 602 out of the adjusting socket 201. The operation is simple and efficient, without the need for complicated tools.

[0030] The spline structure 4, which transmits power between the valve stem and external transmission components, consists of a spline sleeve 401, a spline connecting rod 402, and a spline connecting block 403. The spline sleeve 401 is fitted onto the outside of the adjusting shaft 2. The inner wall of the spline sleeve 401 is connected to the spline connecting rod mounting groove 202 and the spline connecting block mounting groove 203 of the adjusting shaft 2 through the spline connecting rod 402 and the spline connecting block 403. This spline connection method enables efficient power transmission, avoids slippage during transmission, and ensures precise synchronization of valve opening and closing actions.

[0031] To improve the wear resistance and service life of spline sleeve 401, the surface of spline sleeve 401 is coated with a 0.15-0.25mm thick tungsten carbide wear-resistant coating. Tungsten carbide has extremely high hardness and wear resistance, which can effectively resist wear during transmission. At the same time, the coating surface is mirror polished, which can further reduce the surface friction coefficient, reduce transmission resistance, and improve power transmission efficiency. On the other hand, it can reduce the adhesion of impurities, reduce maintenance frequency, and adapt to the requirements of long-term continuous operation.

[0032] The valve shaft drive unit 5 is fixedly installed at the upper end of the main shaft 1, serving as an interface for external power input. It can be connected to drive devices such as motors and handles to realize the active rotation of the valve stem. The valve shaft head 3 is installed at the lower end of the adjusting shaft 2 and is fixedly connected to the lower end bolt hole of the adjusting shaft 2 by fixing bolts 7. The valve shaft head 3 directly contacts the valve core and other components of the valve to realize the transmission of valve stem movement to the valve core, thereby controlling the opening and closing of the valve and the flow regulation.

[0033] All electrical components mentioned in the text are electrically connected to an external controller and power supply, and the controller can be a conventional known device such as a computer that provides control.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A splined valve stem, comprising a shaft, a valve shaft head (3), a connecting spline structure (4), and a valve shaft drive part (5), characterized in that, The shaft includes a main shaft (1) and an adjusting shaft (2). The lower end of the main shaft (1) is provided with a height adjustment groove (101). The upper part of the adjusting shaft (2) is inserted into the height adjustment groove (101). A fixing device (6) is symmetrically arranged on the lower outer side of the main shaft (1). The connecting spline structure (4) is sleeved on the outer side of the adjusting shaft (2). An adjusting insertion hole (201) is provided on the adjusting shaft (2). The adjusting insertion hole (201) is located at the upper end of the connecting spline structure (4). Multiple adjusting insertion holes (201) are evenly distributed from top to bottom. The adjusting shaft (2) and the main shaft (1) are fixedly connected by the fixing device (6). The valve shaft drive part (5) is fixedly arranged at the upper end of the main shaft (1). The valve shaft head (3) is located at the lower end of the adjusting shaft (2). The valve shaft head (3) is fixedly connected to the adjusting shaft (2) by a fixing bolt (7).

2. A splined valve stem as described in claim 1, characterized in that, The fixing device (6) includes an outer frame (601), a fixing block (602), an adjusting block (603), a connecting rod (604), a spring (605), and a sliding plate (606). The connecting rod (604) moves through the outer frame (601). One end of the connecting rod (604) is fixedly connected to the adjusting block (603), and the other end of the connecting rod (604) is fixedly connected to the fixing block (602). The fixing block (602) matches the adjusting socket (201). The outer frame (601) is fixedly connected to the outer wall of the main shaft (1). The spring (605) and the slide plate (606) are disposed inside the outer frame (601). The spring (605) is sleeved on the outside of the connecting rod (604). One end of the spring (605) is fixedly connected to the inner wall of the outer frame (601), and the other end of the spring (605) is fixedly connected to the slide plate (606). The slide plate (606) is slidably connected to the inner wall of the outer frame (601).

3. A splined valve stem as described in claim 2, characterized in that, The connecting spline structure (4) includes a spline sleeve (401), a spline connecting rod (402), and a spline connecting block (403). The inner wall of the spline sleeve (401) is connected to the spline connecting rod (402) and the spline connecting block (403). The spline sleeve (401) is sleeved on the outer side of the adjusting shaft (2). The adjusting shaft (2) has a spline connecting rod mounting groove (202) matching the spline connecting rod (402) and a spline connecting block mounting groove (203) matching the spline connecting block (403).

4. A splined valve stem as described in claim 3, characterized in that, The lower end of the adjusting shaft (2) is provided with a bolt hole (204).

5. A splined valve stem as described in claim 4, characterized in that, The inner wall of the height adjustment groove (101) of the main shaft (1) is fitted with a polytetrafluoroethylene guide bushing.

6. A splined valve stem as described in claim 5, characterized in that, The adjusting block (603) of the fixing device (6) has anti-slip texture on its outer side.

7. A splined valve stem as described in claim 6, characterized in that, The surface of the spline sleeve (401) is coated with a 0.15-0.25mm thick tungsten carbide wear-resistant coating, and the surface of the coating is mirror polished.

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