A steam turbine main steam valve assembly and steam turbine

Abstract

The present application discloses a steam turbine main steam valve assembly and a steam turbine, which relates to the field of steam turbines. The valve assembly includes a valve body, a valve core located in the valve body, and a driving component installed outside the valve body for driving the valve core to move, wherein the valve body is provided with an upper horizontal channel connected to the high-pressure steam end, a lower channel connected to the steam discharge pipe, and a vertical channel connecting the upper horizontal channel and the lower channel, and a working port is formed at the connection between the vertical channel and the upper channel. The automobile turbine main steam valve assembly adopts a valve core with an adaptive expansion area, and uses the pressure on the pressure side to achieve adaptive expansion, which enables the new technology to automatically adjust the expansion state of the valve core according to pressure changes during operation, thereby achieving a more ideal sealing effect under different working conditions. Since the valve core can achieve automatic expansion under high pressure, the sealing effect is enhanced.

Description

Technical Field

[0001] The present application relates to the field of steam turbines, and in particular to a steam turbine main steam valve assembly and a steam turbine. Background Art

[0002] At present, the main steam valve of steam turbine is mainly used in industry to adjust the steam flow and ensure the efficient operation of steam turbine. The common valve design adopts radial sealing structure, which controls opening and closing through the horizontal or vertical movement of valve core, and usually relies on multiple sealing rings, gaskets or high-precision machined sealing surfaces to prevent steam leakage. Although these designs meet the needs to a certain extent, the sealing effect is difficult to maintain for a long time under complex working conditions, and there are obvious shortcomings.

[0003] The main problem with existing radial sealing structures is that the sealing surface is exposed to high-temperature and high-pressure steam environments for a long time, which can easily lead to reduced sealing performance and even steam leakage due to thermal fatigue, deformation and wear. Traditional sealing methods rely on spring force or manual tightening, which cannot effectively cope with pressure fluctuations and temperature changes, resulting in accelerated wear of sealing elements during frequent opening and closing, requiring regular replacement of seals, increasing operation and maintenance costs and downtime.

[0004] In addition, the traditional structure requires extremely high manufacturing precision for the valve core and the sealing surface, and the processing is time-consuming and expensive. Even if high precision is achieved, it is still difficult to avoid leakage problems caused by small gaps or defects under high pressure. Under harsh working conditions, the seal may expand unevenly or deform thermally under the alternating effects of high temperature and high pressure, further reducing the sealing effect. These shortcomings limit the reliability and durability of existing valve technology.

[0005] In the case of frequent start-stop or high temperature and high pressure fluctuations, the defects of the traditional radial sealing structure are particularly prominent, which may cause instantaneous leakage and pressure imbalance, affecting the safety and efficiency of the equipment. Therefore, the development of an axially sealed steam turbine main steam valve assembly is of great significance to improving the sealing performance and equipment reliability. Summary of the invention

[0006] The purpose of the present application is to overcome at least one of the shortcomings of the prior art, and to provide a steam turbine main steam valve assembly and a steam turbine. The steam turbine main steam valve assembly adopts a valve core with an adaptive expansion area, and uses the pressure on the pressure side to achieve adaptive expansion. This enables the new technology to automatically adjust the expansion state of the valve core according to pressure changes during operation, thereby achieving a more ideal sealing effect under different working conditions. Since the valve core can automatically expand under high pressure, the sealing effect is enhanced. This design can be dynamically adjusted according to the real-time changes in steam pressure, so that the sealing surface is always kept in the optimal contact state, effectively reducing the possibility of steam leakage. At the same time, due to this adaptability, the wear of the valve core and the sealing surface is significantly reduced, the service life of the sealing element is extended, and the maintenance frequency of the equipment is reduced.

[0007] To achieve the above-mentioned purpose, in a first aspect, the present application discloses a main steam valve assembly of a steam turbine, the valve assembly comprising a valve body, a valve core located in the valve body, and a driving assembly installed outside the valve body for driving the valve core to move, wherein the valve body is provided with an upper horizontal channel connected to a high-pressure steam end, a lower channel connected to a steam discharge pipe, and a vertical channel connecting the upper horizontal channel and the lower channel, and a working port is formed at the connection between the vertical channel and the upper channel;

[0008] The valve body is located at the connection between the upper horizontal channel and the vertical channel, and seals the working port of the vertical channel under the drive of the drive assembly;

[0009] The driving assembly includes a controller, a motor controlled by the controller, and a telescopic shaft driven to extend and retract by the motor. The telescopic shaft is locked with one end of the optical axis, and a heat insulation pad is provided between the telescopic shaft and the optical axis.

[0010] The valve core comprises a frame and a rubber body sleeved outside the frame; the frame is connected to a driving assembly via an optical axis extending downward from the valve body, and the driving assembly drives the valve core to perform reciprocating linear motion;

[0011] The rubber body includes a first annular sealing slope, a second annular sealing slope and an annular adaptive sealing surface between the first and second slopes at the lower end, and the working port is provided with a first fixed sealing surface, a second fixed sealing surface matched with the first sealing slope, and an arc-shaped sealing groove between the first and second fixed sealing surfaces;

[0012] In contrast, an annular deformation chamber is provided in the cavity near the adaptive sealing surface, and the deformation chamber is connected to the steam inlet located on the side surface near the upper end of the rubber body through a channel, and is substantially connected to the upper horizontal channel through the steam inlet;

[0013] The channel is provided with a mounting groove with an opening facing downward at a position close to the steam inlet, and a pressure sensor connected to a controller is installed in the mounting groove. The controller adjusts the drive component based on feedback data from the steam pressure sensor to regulate the sealing pressure between the valve core and the air inlet.

[0014] Furthermore, the adaptive sealing surface is spaced 5-10 mm from the annular cavity to form a deformable wall.

[0015] Furthermore, the rubber body is a fluororubber part.

[0016] In a second aspect, the present application discloses a steam turbine, comprising a steam turbine body having a steam inlet pipe and a steam turbine main steam valve assembly, wherein the steam turbine main steam valve assembly is installed in the steam inlet pipe to realize opening and closing control of the steam inlet pipe.

[0017] Compared with the prior art, the present application has at least one beneficial effect:

[0018] 1. Automatically adjust the sealing effect: The valve core has an adaptive expansion area, which can automatically adjust the expansion state according to pressure changes, achieve a more ideal sealing effect under different working conditions, and effectively reduce the possibility of steam leakage.

[0019] 2. Reduce wear and extend service life: Since the valve core can automatically expand under high pressure and maintain the best contact state, the wear between the sealing surface and the valve core is reduced, the service life of the sealing element is significantly extended, and the maintenance frequency is reduced.

[0020] 3. Enhance the durability of sealing performance: Through the adaptive sealing surface design and the application of rubber body materials (such as fluororubber), it can still maintain good sealing performance under high temperature and high pressure environment, enhancing the long-term stability and durability of the equipment.

[0021] 4. Reduce manufacturing precision requirements: This technical solution reduces the high-precision manufacturing requirements between the valve core and the sealing surface, thereby reducing processing costs and complexity.

[0022] 5. Improve system safety and efficiency: In scenarios with frequent start-stop or high temperature and high pressure fluctuations, the valve assembly can dynamically respond to pressure changes, avoid instantaneous leakage, and maintain the safety and efficiency of system operation.

[0023] The above-listed beneficial effects are not exhaustive of all advantages. Other potential beneficial effects and detailed technical implementations will be further disclosed in the examples or other description parts of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] After reading the following detailed description in conjunction with the accompanying drawings, you will have a better understanding of various aspects of the present disclosure. The positions, sizes, and ranges of various structures shown in the accompanying drawings sometimes do not represent the actual positions, sizes, and ranges. In the accompanying drawings:

[0025] FIG1 is a schematic diagram of the overall structure of an embodiment disclosed in the present application.

[0026] FIG. 2 is a schematic diagram of the internal structure of an embodiment disclosed in the present application after removing the drive assembly.

[0027] FIG3 is a schematic structural diagram of a valve body and a steam inlet in an embodiment disclosed in the present application, in which the steam inlet is partially shown. DETAILED DESCRIPTION

[0028] The present disclosure will be described below with reference to the accompanying drawings, wherein the accompanying drawings illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in a variety of different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present disclosure more complete and fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.

[0029] It should be understood that the same reference numerals represent the same elements throughout the drawings. In the drawings, the dimensions of certain features may be distorted for clarity.

[0030] It should be understood that the words used in the specification are only used to describe specific embodiments and are not intended to limit the present disclosure. All terms (including technical terms and scientific terms) used in the specification have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of brevity and / or clarity, the techniques, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorized specification.

[0031] The singular forms "a", "said" and "the" used in the specification include plural forms unless clearly indicated. The words "include", "comprise" and "contain" used in the specification indicate the presence of the claimed features, but do not exclude the presence of one or more other features. The word "and / or" used in the specification includes any and all combinations of one or more of the relevant listed items.

[0032] Example:

[0033] As shown in FIGS. 1-3 , this embodiment discloses an exemplary structure of a main steam valve assembly of a steam turbine, which as a whole comprises a valve body 1 , a valve core 2 and a drive assembly 3 .

[0034] An upper horizontal channel 101, a lower channel 102 and a vertical channel 103 connecting the two are arranged inside the valve body 1. The upper horizontal channel 101 is connected to the high-pressure steam inlet, and the lower channel 102 is connected to the steam discharge pipe. The vertical channel 103 forms a working port at the intersection with the upper horizontal channel 101, which is used to control the introduction and discharge of steam. Under the action of the drive component 3, the valve core 2 seals the working port of the vertical channel 103, thereby realizing effective control of steam.

[0035] The drive assembly 3 is located outside the valve body 1, and includes a controller 301, a motor, a telescopic shaft, and a thermal insulation pad. The controller 301 drives the telescopic shaft to perform telescopic movement by controlling the motor. One end of the telescopic shaft is fixedly connected to the optical axis 208, and the other end of the optical axis 208 is connected to the frame of the valve core 2. The drive assembly 3 drives the valve core 2 to perform reciprocating linear motion inside the valve body 1 through the optical axis 208. The thermal insulation pad is used to reduce the heat transfer of high-temperature steam to the telescopic shaft and the motor, ensuring the stable operation of the equipment, and is particularly suitable for use in environments with large temperature fluctuations.

[0036] The design of the drive component 3 fully considers the thermal stability and control accuracy of the system, and the precise positioning of the valve core 2 is achieved through the precise coordination of the controller 301 and the motor. The control algorithm of the drive component 3, combined with the real-time feedback pressure information, can accurately adjust the position of the valve core 2, thereby controlling the steam flow, improving the operating efficiency of the equipment and extending the service life of the equipment. The overall design of the drive component 3 also pays special attention to fatigue resistance and durability to ensure that it can maintain a stable working state under long-term high-frequency operation conditions. Through the synergy with the motor, the controller 301 can not only finely control the movement of the valve core 2, but also adapt to dynamic changes under different load conditions, so as to better meet the actual application needs.

[0037] The valve core 2 is composed of a skeleton and a fluororubber body sleeved on the outside of the skeleton. The skeleton is connected to the drive assembly 3 through the optical axis 208. The telescopic movement of the drive assembly 3 causes the valve core 2 to move up and down, thereby controlling the flow of steam. The fluororubber body adopts an annular first sealing bevel 201, a second sealing bevel 202, and an annular adaptive sealing surface 203 located between the two. Through the cooperation of a multi-layer structure, the valve core 2 can achieve effective sealing at different positions. The excellent high temperature resistance and chemical corrosion resistance of fluororubber make it very suitable for high temperature and high pressure steam environments, and the skeleton provides the structural strength required by the valve core 2. The flexibility of fluororubber enables the valve core 2 to maintain a stable sealing effect when subjected to large pressure changes, and can effectively reduce material fatigue and aging problems during long-term use, thereby improving the service life and reliability of the entire valve.

[0038] Inside the valve body 1, the working port of the vertical channel 103 is provided with a first fixed sealing surface 104, a second fixed sealing surface 105 and an arc-shaped sealing groove 106, which match the first sealing inclined surface 201 and the second sealing inclined surface 202 of the valve core 2, ensuring that a stable sealing state is formed between the valve core 2 and the vertical channel 103 during operation, thereby effectively preventing steam leakage.

[0039] In order to meet the sealing requirements under different pressure conditions, an annular deformation cavity 204 is provided near the adaptive sealing surface 203 of the valve core 2 to enhance the sealing effect through deformation. The deformation cavity 204 is connected to the steam inlet 207 on the valve core 2 through the channel 206, and then connected to the upper horizontal channel 101. Such a design can effectively use the steam pressure to adjust the contact strength and area of ​​the sealing surface, thereby meeting the operating requirements under different working conditions.

[0040] The design of the annular deformation chamber 204 can respond to changes in steam pressure, ensuring that the rubber body adjusts its sealing state under different working conditions. When the system is under high pressure operation, the gas in the deformation chamber 204 is compressed, causing the adaptive sealing surface 203 to expand outward and come into close contact with the fixed sealing surface, further improving the reliability of the seal and effectively reducing the risk of leakage. This design can not only improve the sealing performance of the valve, but also effectively disperse the additional stress generated by the system under high pressure conditions, thereby extending the overall life of the valve.

[0041] The adaptive sealing surface 203 of the rubber body is spaced 5-10 mm from the annular deformation cavity 204 to form a deformation wall 205. When high-pressure steam passes through, the deformation wall 205 deforms under the action of the steam pressure, thereby improving the sealing performance and reducing steam leakage. This design is particularly suitable for the requirements for valve sealing performance when the steam turbine is running under different loads. Through the adaptive characteristics of the deformation wall 205, the valve core 2 can cope with subtle changes under high-pressure conditions and maintain a stable sealing effect. The elastic design of the deformation wall 205 ensures that it will not lose its sealing ability even in a long-term high-pressure environment, ensuring that the valve core 2 can work effectively for a long time.

[0042] The design of the deformable wall 205 not only improves the sealing performance of the system, but also reduces the loss of the sealing surface due to temperature and pressure fluctuations. This adaptive design achieves a longer maintenance cycle and reduces operating costs. When facing extreme pressure conditions, the deformable wall 205 can quickly adjust the sealing state to reduce the wear and material fatigue of the valve core 2. The deformable wall 205 also has a certain buffering function. When the system is subjected to external impact or sudden pressure changes, it can effectively alleviate the direct impact on the valve core 2, thereby protecting other key components of the valve.

[0043] At a position close to the steam inlet 207, the channel 206 is provided with a mounting groove with an opening facing downward, and a pressure sensor 209 is installed in the mounting groove. The pressure sensor 209 is connected to the controller 301 to detect the pressure in the valve body 1 in real time, and feed back the pressure signal to the controller 301 so as to adjust the drive component 3 accordingly to ensure that the downward distance of the valve core 2 is accurate. Through the feedback control system, the device can automatically adjust according to the change of steam pressure in actual application, thereby enhancing the safety and stability of the device. The feedback system can not only accurately control the steam flow, but also monitor various operating states of the system to ensure that the equipment can still maintain reliable operation under extreme working conditions.

[0044] The controller 301 includes a central processing unit, a signal processing module, a feedback control module and a power management module. The central processing unit is the brain of the entire controller, responsible for executing complex control algorithms and adjusting the action of the drive component 3 based on the pressure signal monitored in real time. The function of the signal processing module is to receive and pre-process the signals from the air pressure sensor 209, which contain real-time pressure data inside the system. The signal processing module amplifies, filters and performs analog-to-digital conversion on these signals to remove interference signals, improve the accuracy of the signals, and transmits the processed signals to the central processing unit. The feedback control module generates corresponding control signals according to the instructions of the central processing unit to drive the execution components in the system, such as motors, etc. The power management module provides a stable and efficient power supply for the controller 301 and its internal functional modules to ensure that the entire control system can work continuously and reliably.

[0045] In the signal processing module, the pressure signal is processed carefully, including primary amplification, to increase the signal strength and thus enhance the anti-interference ability. It is then filtered to remove high-frequency noise and unnecessary interference components in the system, and then converted into a digital signal through an analog-to-digital converter for subsequent digital processing and analysis by the central processing unit.

[0046] The central processing unit adopts a control algorithm based on the combination of PID (proportional-integral-differential) control and adaptive control to quickly process pressure signals and respond to the system to ensure the system's rapid adaptability and control accuracy to pressure changes. PID control is used to accurately adjust the position of valve core 2 and generate control signals based on the current deviation, while adaptive control continuously adjusts PID parameters to adapt to different operating conditions by monitoring pressure changes in real time. The combination of this algorithm can maintain efficient control performance under different operating conditions, allowing the system to quickly respond to pressure fluctuations and ensure the stability of steam flow.

[0047] The central processing unit calls the preset control strategy, analyzes the current pressure data and compares it with the target pressure range. When the pressure exceeds the safe range, it instructs the feedback control module to adjust the motor to ensure the safety and stability of the system.

[0048] For example, when the pressure inside the valve body 1 increases and exceeds the set safety threshold, the central processing unit will instruct the motor to slow down or reverse through the feedback control module, so that the valve core 2 moves downward and reduces the opening, thereby reducing the steam flow rate and reducing the pressure inside the system; when the pressure is detected to be lower, the central processing unit will accelerate the operation of the motor, push the valve core 2 upward, increase the opening, increase the steam flow rate, and increase the system pressure.

[0049] The feedback control module is one of the key links in the entire closed-loop control system. It is responsible for generating control signals corresponding to the calculation results of the central processing unit. It maintains real-time communication with the air pressure sensor 209, receives pressure data processed by the signal processing module, and accurately adjusts the working state of the motor and other actuators according to the instructions of the central processing unit to ensure that the position of the valve core 2 can be dynamically adjusted with the pressure change, thereby achieving accurate control of the steam flow. Through this closed-loop control mechanism, the system can quickly respond to fluctuations in internal and external pressures, and effectively adjust the position of the valve core 2 to the optimal state, avoiding the problem of unstable system operation caused by excessive or large pressure changes.

[0050] The power management module ensures the continuous power supply of the controller 301 and all internal modules. Through multiple power protection and voltage stabilization circuits, it prevents the controller from malfunctioning or failing due to power fluctuations or interruptions, thereby improving the reliability and safety of the entire system. The design of the entire control system ensures that the steam turbine system can maintain a stable operating state under various complex working conditions through the coordinated work of the central processing unit, signal processing module, feedback control module and power management module, and can quickly respond to pressure fluctuations, achieve efficient and stable steam flow control, and maintain the operating efficiency of the steam turbine.

[0051] A specific scenario of the above valve assembly in practical application is: when the steam turbine starts, the controller 301 controls the motor to drive the telescopic shaft to move the valve core 2 upward, open the valve, and allow high-pressure steam to enter the steam turbine; when the steam turbine is running stably, the controller 301 controls the drive component 3 through the signal of the air pressure sensor 209 to move the valve core 2 downward to close the working port and adjust the steam flow. The adaptive sealing surface 203 of the rubber body and the deformation cavity 204 enable the stable sealing effect to be maintained under the impact of high-pressure steam, improve the operating efficiency and safety of the steam turbine, reduce energy loss and extend the service life of the equipment. During operation, the controller 301 can continuously monitor the flow state of the steam to ensure that the valve can maintain the optimal opening and sealing state at any time, thereby greatly improving the stability of the system.

[0052] The controller 301 accurately adjusts the position of the valve core 2 according to the real-time changes in the steam pressure to adjust the steam flow. When the steam pressure is low, the controller 301 moves the valve core 2 upward to reduce the steam resistance and increase the output power of the steam turbine; when the steam pressure increases, the controller 301 adjusts the position of the valve core 2 downward to reduce the steam flow and ensure the safe operation of the steam turbine. Through dynamic adjustment, the system can achieve the best operating state under different load conditions, improve efficiency and reduce steam waste. This precise adjustment method enables the steam turbine to operate smoothly and efficiently under various load conditions, significantly reducing the energy loss caused by pressure fluctuations.

[0053] Through real-time monitoring and feedback from the air pressure sensor 209, the controller 301 effectively prevents the valve core 2 from being worn due to high-frequency start-stop, thereby extending the service life of the equipment. This valve assembly is particularly suitable for working conditions where the steam flow rate is frequently adjusted, such as the start-up, shutdown and load change process of the steam turbine. It can flexibly respond to different operating requirements and ensure stable operation of the system. This efficient and flexible design significantly improves the operating efficiency of the steam turbine and reduces maintenance and operating costs. The entire system can not only operate stably under dynamically changing load environments, but also reduce mechanical losses caused by frequent start-stops, thereby greatly extending the maintenance cycle of the equipment and further reducing operating costs and maintenance difficulties. In actual operation, this valve assembly has demonstrated extremely high reliability and flexibility, especially in complex and changeable operating environments, where its advantages are more significant, meeting the stringent requirements of modern steam turbines for efficient and stable operation.

[0054] Although the exemplary embodiments of the present disclosure have been described, it should be understood by those skilled in the art that various changes and modifications can be made to the exemplary embodiments of the present disclosure without departing from the spirit and scope of the present disclosure in essence. Therefore, all changes and modifications are included in the scope of protection of the present disclosure as defined by the claims. The present disclosure is defined by the appended claims, and the equivalents of these claims are also included.

Claims

1. A steam turbine main steam valve assembly, characterized in that: The valve assembly comprises: a valve body, a valve core located in the valve body, and a driving assembly installed outside the valve body for driving the valve core to move, wherein the valve body is provided with an upper horizontal channel connected to the high-pressure steam end, a lower channel connected to the steam discharge pipe, and a vertical channel connecting the upper horizontal channel and the lower channel, and a working port is formed at the connection between the vertical channel and the upper channel; The valve body is located at the connection between the upper horizontal channel and the vertical channel, and seals the working port of the vertical channel under the drive of the drive assembly; The driving assembly includes a controller, a motor controlled by the controller, and a telescopic shaft driven to extend and retract by the motor. The telescopic shaft is locked with one end of the optical axis, and a heat insulation pad is provided between the telescopic shaft and the optical axis. The valve core comprises a frame and a rubber body sleeved outside the frame; the frame is connected to a driving assembly via an optical axis extending downward from the valve body, and the driving assembly drives the valve core to perform reciprocating linear motion; The rubber body includes a first annular sealing slope, a second annular sealing slope and an annular adaptive sealing surface between the first and second slopes at the lower end, and the working port is provided with a first fixed sealing surface, a second fixed sealing surface matched with the first sealing slope, and an arc-shaped sealing groove between the first and second fixed sealing surfaces; In contrast, an annular deformation chamber is provided in the cavity near the adaptive sealing surface, and the deformation chamber is connected to the steam inlet located on the side surface near the upper end of the rubber body through a channel, and is substantially connected to the upper horizontal channel through the steam inlet; The channel is provided with a mounting groove with an opening facing downward at a position close to the steam inlet, and a pressure sensor connected to a controller is installed in the mounting groove. The controller adjusts the drive component based on feedback data from the steam pressure sensor to regulate the sealing pressure between the valve core and the air inlet.

2. A steam turbine main steam valve assembly as claimed in claim 1, characterized in that: The adaptive sealing surface is spaced 5-10 mm from the annular cavity to form a deformable wall.

3. A steam turbine main steam valve assembly as claimed in claim 1, characterized in that: The rubber body is a fluororubber part.

4. A steam turbine, characterized in that: The invention comprises a steam turbine body having a steam inlet pipe and a main steam valve assembly of the steam turbine as described in any one of claims 1 to 3, wherein the main steam valve assembly of the steam turbine is installed on the steam inlet pipe to realize the opening and closing control of the steam inlet pipe.

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