A valve for a thermal power plant

Abstract

The embodiment of the present application provides a valve for thermal power plant, which is characterized by comprising a handle, a base, a frame body for connecting and fixing the handle and the base as a center column, a valve rod and a spline type locking structure; the handle is fixed to the threaded top end of the frame body through a nut arranged at the top of the handle; the base is located below the handle; the spline type locking structure is arranged between the top of the valve rod and the base, so as to realize detachable connection of the valve rod and the base, and then the valve rod and the base are fixed through nuts covering the top of the valve rod and the bottom of the base. The provided valve handle is not limited by space, and is easy to operate, has sufficient torque, low damage risk and high safety under high-temperature and high-pressure working conditions.

Description

Technical Field

[0001] This invention relates to the field of steam turbine valve operation technology, and more particularly to a valve for thermal power plants. Background Technology

[0002] In thermal power plant systems such as steam turbines and steam-water pipelines, numerous high-temperature and high-pressure valves perform core functions of medium flow control and flow regulation, making them crucial equipment for the safe and stable operation of the unit. Traditional valve operating handles are mostly fixed circular handwheels, which present several drawbacks in practical applications. Firstly, they are poorly adaptable to confined space operations: Valves are installed in confined areas such as maintenance platforms, pipe racks, and foundation pits. Traditional fixed handwheels are often obstructed by surrounding scaffolding, pipelines, guardrails, and other obstacles, resulting in insufficient operating space. Furthermore, the operating angle and lever arm length cannot be adjusted according to site conditions, requiring maintenance personnel to maintain awkward postures, leading to high labor intensity and even making it difficult to grip and apply force properly. Improper operation can easily cause internal leakage, jamming, and other defects, significantly increasing operational risks and extending project timelines.

[0003] Secondly, the safety of operation in high-temperature environments is insufficient: the main steam and reheat steam pipeline valves in thermal power plants are in high-temperature conditions for a long time. The traditional handle is rigidly connected to the valve stem, which easily conducts the temperature rise of the valve body, resulting in excessively high surface temperature of the handle. Maintenance personnel are prone to burns when operating it, and there is no heat insulation protection structure, which does not meet the requirements for safe operation.

[0004] Thirdly, the torque transmission and operating efficiency are insufficient: the traditional handwheel has a fixed lever arm. For large-diameter high-pressure valves, the torque required to open or close is large. Operators need to use auxiliary tools such as levers, which can easily cause deformation and damage to the valve stem and handwheel. Moreover, the operating efficiency is low and cannot meet the emergency needs of rapid opening and closing.

[0005] In summary, traditional valve handles in thermal power plants suffer from several problems, including being difficult to operate due to space constraints, the risk of valve damage due to improper operation, inconvenience in operation under high-temperature conditions, poor safety, and insufficient torque. Summary of the Invention

[0006] In view of this, and considering the problems of traditional valve handles in existing thermal power plants, such as difficulty in operation due to space constraints, risk of valve damage due to improper operation, inconvenience in operation under high-temperature conditions, poor safety, and insufficient torque, this invention provides a valve for thermal power plants, comprising: Handle, base, frame that serves as a central column to connect and fix the handle and base, valve stem, and spline-type locking structure; The handle is fixed to the threaded end of the frame by a nut located on its top; The base is located below the handle; The spline-type locking structure is installed between the top of the valve stem and the base, enabling a detachable connection between the valve stem and the base, which is then secured by nuts covering the top of the valve stem and the bottom of the base.

[0007] In one possible embodiment, the handle is a circular control panel with multiple support rods; The handle's circular inner hub, the top of the base, and the frame are rigidly connected.

[0008] In one possible embodiment, the spline locking structure includes: an inner spline tooth on the inner wall of the base, and an outer spline tooth on the outer wall of the top end of the valve stem; the inner spline tooth and the outer spline tooth can be seamlessly engaged and locked.

[0009] In one possible embodiment, the valve further includes: a plurality of lever arms connecting the handle and the base; One end of the lever arm is connected to the bottom of the outer plate of the circular operating disc of the handle, and the other end of the lever arm is fixed to the base by screws.

[0010] In one possible embodiment, a force-applying rod, a matching force-applying hole, and a heat-insulated operating head are inserted near the connection between the base and the lever arm. The force-applying hole and the force-applying rod are connected by an anti-disengagement lock. The heat-insulating operating head is located at the end of the force-applying rod and is fixed to the base.

[0011] In one possible embodiment, a positioning pin is provided on the side of the base to achieve circumferential positioning of the handle and valve stem.

[0012] In one possible embodiment, a torque scale marking is provided at the connection between the handle and the lever arm, and an anti-slip corrugated structure is provided on the surface of the handle and at both ends of the lever arm.

[0013] In one possible embodiment, a high-temperature resistant sealing gasket is provided at the bottom of the base.

[0014] In one possible embodiment, an air gap insulation layer is provided at the location where the base connects to the valve stem and at a location on the frame near the base to isolate the heat generated by the valve stem.

[0015] In one possible embodiment, the lever arm is provided with a removable heat-insulating sleeve.

[0016] This invention provides a valve for a thermal power plant, characterized by comprising: a handle, a base, a frame that serves as a central column connecting and fixing the handle and the base, a valve stem, and a spline-type locking structure; the handle is fixed to the threaded top of the frame by a nut located at its top; the base is located below the handle; the spline-type locking structure is disposed between the top of the valve stem and the base, achieving a detachable connection between the valve stem and the base, and is further fixed by nuts covering the top of the valve stem and the bottom of the base. The provided valve handle is not limited by space, and is easy to operate under high temperature and high pressure conditions, provides sufficient torque, has a low risk of damage, and is highly safe. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the structure of a valve for a thermal power plant provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of another thermal power plant valve provided in an embodiment of the present invention; Figure 3 This is an application scenario diagram of a valve in a thermal power plant provided by an embodiment of the present invention. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0019] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0020] See Figure 1 This is a structural schematic diagram of a power plant valve provided in an embodiment of the present invention, as shown below. Figure 1 As shown, it may include: a handle 1, a base 2, a frame 3 that serves as a central column connecting and fixing the handle 1 and the base 2, a valve stem 4, and a spline-type locking structure 7. This structure is compatible with various high-temperature and high-pressure valves in thermal power plants, such as gate valves, globe valves, and regulating valves. It meets the needs of daily operation and maintenance, as well as unit overhaul and emergency operation, and has strong versatility.

[0021] The handle 1 can be a rod-shaped structure or a circular operating panel with multiple support rods. In practice, the rod-shaped handle 1 is limited by space, inconvenient to operate, and poses a greater risk of danger. Therefore, the handle 1 in this application will only be described as a circular operating panel with multiple support rods. The support rods can be understood as lateral lever arms.

[0022] See Figure 3 This is an application scenario diagram of a valve in a thermal power plant provided by an embodiment of the present invention, such as... Figure 3 As shown, the circular control panel can be adjusted to change the operating angle according to the on-site working conditions. There is no need to worry about insufficient lever arm length. Operators can apply force at any angle without adjusting their body posture, reducing labor intensity. Moreover, it can rotate 360° and is not limited by surrounding spatial obstacles such as scaffolding, pipes, railings, etc., which greatly improves maintenance efficiency and reduces operational risks.

[0023] In one possible embodiment, the handle 1 is secured to the threaded end of the frame 3 by a nut fitted onto its top. Figure 1 As shown, a hexagonal nut, which fits onto the threaded part of the top of the frame 3 above the handle 1, can also be other shaped nuts, such as round nuts. It is mainly used to hold the handle 1 hub in place. A brake washer can be placed between the nut and the handle 1 to enhance the fixing effect.

[0024] Afterwards, a set screw or cotter pin can be installed on the side of the hub of handle 1 for further reinforcement, which is not limited here.

[0025] A positioning pin 8 can also be installed on the side of the base 2 to achieve circumferential positioning of the handle 1 and the valve stem 4.

[0026] The base 2 is located below the handle 1 and is fixed by covering the top of the valve stem 4 and the bottom of the base 2 with a nut at its bottom. The base 2 can be forged from high-strength alloy steel, which is resistant to high temperature and fatigue, has a long service life, and can fully cope with the high temperature and high pressure conditions in the thermal systems such as steam turbines and steam-water pipelines in thermal power plants.

[0027] The base 2 can be fitted with a high-temperature resistant sealing gasket 9 at its bottom to adapt to the working conditions of high-temperature pipeline valves and prevent the temperature rise of the valve body from being directly conducted to the handle body.

[0028] Considering that the valve stem 4 can directly conduct high temperature to the handle 1, base 2, etc. through the frame 3, an air gap insulation layer 10 can be installed at the connection between the base 2 and the valve stem 4, and on the frame 3 near the base 2, to isolate the heat generated by the valve stem 4. This air gap insulation layer 10 can be lined with high-temperature resistant ceramic insulation cotton to enhance the insulation effect, blocking heat conduction from the valve stem to the handle, ensuring that the surface temperature of the handle's operating end remains below 40℃, and preventing burns from high temperatures.

[0029] The spline-type locking structure 7 is disposed between the top of the valve stem 4 and the base 2, enabling a detachable connection between the valve stem 4 and the base 2. Specifically, the locking structure 7 can be configured such that internal splines are formed on the inner wall of the base 2, and external splines are formed on the outer wall of the top of the valve stem 4, allowing the internal and external splines to seamlessly engage and lock. This is then reinforced by the aforementioned bottom nut. The spline-type locking structure 7... Figure 1 The nut is located inside the bottom nut of base 2 and is not shown in the figure. This structure facilitates disassembly, maintenance, and replacement, and can be installed without specialized tools, making it suitable for the on-site operation and maintenance conditions of thermal power plants. It prevents loosening during use and can withstand the high temperatures of the thermal system, preventing jamming during operation.

[0030] However, simply fixing the handle 1 and base 2 to the frame 3 with nuts is not secure. Therefore, the circular inner hub of the handle 1, the base 2 connected to the top of the frame 3, and the frame 3 can be rigidly connected. In practice, the three can be welded together to ensure that the torque can be transmitted in a 1:1 ratio.

[0031] Even after the operator rotates handle 1, there is still a possibility that improper operation could cause handle 1 to become unstable if the maintenance personnel cannot hold it properly or apply force.

[0032] See Figure 2 This is a schematic diagram of another thermal power plant valve provided in an embodiment of the present invention, as shown below. Figure 2 As shown, multiple lever arms 5 connecting the handle 1 and the base 2 can be added to this structure. The lever arms 5 are equipped with detachable heat-insulating sleeves 11 to adapt to different ambient temperature conditions, and can be quickly disassembled for inspection during maintenance.

[0033] Specifically, such as Figure 2 As shown, one end of the lever arm 5 is connected to the bottom of the outer plate of the circular operating disc of the handle 1, and the other end of the lever arm 5 is fixed to the base 2 by screws.

[0034] In addition, such as Figure 1 , Figure 2 As shown, if the torque is insufficient when operating the valve using handle 1, a force-applying hole can be provided near the connection between base 2 and lever arm 5, and a force-applying rod 6 can be inserted into this hole. The size of this force-applying rod can be determined according to the actual application. It can also be an extendable or telescopic force-applying rod 6. Specifically, the length of the force-applying rod can be controlled according to actual needs to amplify the operating torque, meeting the opening and closing requirements of large-diameter, high-pressure valves. The ergonomic operating head reduces labor intensity, and the operating efficiency can be increased by more than 50% compared to traditional handles, while also preventing damage to the valve from excessive torque operation.

[0035] Here, the extension rod 6 can be made of lightweight aluminum alloy for easy carrying. An anti-detachment lock can also be installed between the extension hole and the extension rod 6 to prevent it from falling off during application of force and causing safety accidents. Furthermore, to address the high temperature conducted from the valve stem 4, a heat-insulating operating head can be installed at the end of the extension rod 6, fixed to the base 2, to ensure safety during emergency operations. A removable heat-insulating sleeve 11 can also be installed on the extension rod for further heat insulation.

[0036] In this way, by combining heat insulation with heat insulation pads, heat insulation operating heads, air gap heat insulation layers, ceramic heat insulation cotton and detachable protective sleeves, the conduction of valve body temperature rise is effectively blocked, the operating end temperature is controllable, and the problem of burns from operating high-temperature valves is completely solved, which complies with the safety operation specifications of thermal power plants.

[0037] Although the valve structure takes into account torque and operating efficiency by incorporating a lever arm 5 and a lever 6, and a circular control panel handle 1 to account for space limitations, and also incorporates heat insulation pads and insulation layers for safety during operation, operators may still apply varying degrees of force, resulting in asymmetrical torque delivery and affecting the valve's lifespan.

[0038] Therefore, a torque scale mark can be set at the connection between the handle 1 and the lever arm 5 for the operator's reference. The operating torque can be displayed intuitively, avoiding damage to the valve stem 4 due to excessive torque operation.

[0039] Anti-slip corrugated structures can also be set on the surface of handle 1 and both ends of lever arm 5 to increase grip friction and further improve the operator's operating efficiency.

[0040] This invention provides a valve for a thermal power plant, characterized by comprising: a handle, a base, a frame that serves as a central column connecting and fixing the handle and the base, a valve stem, and a spline-type locking structure; the handle is fixed to the threaded top of the frame by a nut located at its top; the base is located below the handle; the spline-type locking structure is disposed between the top of the valve stem and the base, achieving a detachable connection between the valve stem and the base, and is further fixed by nuts covering the top of the valve stem and the bottom of the base. The provided valve handle is not limited by space, and is easy to operate under high temperature and high pressure conditions, provides sufficient torque, has a low risk of damage, and is highly safe.

[0041] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or equivalent to the scope of this invention are included in this invention.

[0042] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0043] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0044] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0045] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A valve for a thermal power plant, characterized in that, include: Handle (1), base (2), frame (3) that connects and fixes the handle (1) and base (2) as a central column, valve stem (4), and spline locking structure (7). The handle (1) is fixed to the threaded end of the frame (3) by a nut sleeve on its top; The base (2) is located below the handle (1); The spline locking structure (7) is set between the top of the valve stem (4) and the base (2) to realize the detachable connection between the valve stem (4) and the base (2), and then fixed by the nuts covering the top of the valve stem (4) and the bottom of the base (2).

2. The valve according to claim 1, characterized in that, The handle (1) is a circular operating disc with multiple support rods; The handle (1) is rigidly connected to the inner circular hub, the top of the base (2), and the frame (3).

3. The valve according to claim 1, characterized in that, The spline locking structure (7) includes: an inner spline tooth on the inner wall of the base (2) and an outer spline tooth on the top outer wall of the valve stem (4); the inner spline tooth and the outer spline tooth can be seamlessly engaged and locked.

4. The valve according to claim 2, characterized in that, Also includes: Multiple lever arms (5) connecting the handle (1) and the base (2); One end of the lever (5) is connected to the bottom of the outer plate of the circular operating disc of the handle (1), and the other end of the lever (5) is fixed to the base (2) by screws.

5. The valve according to claim 4, characterized in that, Near the connection point between the base (2) and the lever arm (5), a force-adding rod (6), a matching force-adding hole, and a heat-insulating operating head are inserted; The force-applying hole and the force-applying rod are connected by an anti-disengagement lock. The heat-insulating operating head is located at the end of the force-adding rod (6) and fixed to the base (2).

6. The valve according to claim 1, characterized in that, The base (2) is provided with a positioning pin (8) on its side to achieve circumferential positioning of the handle (1) and the valve stem (4).

7. The valve according to claim 4, characterized in that, Torque scale markings are provided at the connection between the handle (1) and the lever arm (5), and anti-slip corrugated structures are provided on the surface of the handle (1) and at both ends of the lever arm (5).

8. The valve according to claim 1, characterized in that, The base (2) is provided with a high-temperature resistant sealing gasket (9) at the bottom.

9. The valve according to claim 1, characterized in that, An air gap insulation layer (10) is provided at the connection between the base (2) and the valve stem (4) and at the position on the frame (3) near the base (2) to isolate the heat generated by the valve stem (4).

10. The valve according to claim 1, characterized in that, The lever arm (5) is provided with a detachable heat insulation sleeve (11).

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