Steam turbine valve device and fault detection assembly

Abstract

The invention relates to the technical field of steam turbines, and discloses a steam turbine valve device and a fault detection assembly.The steam turbine valve device comprises a steam turbine valve and a supporting assembly, the bottom of the steam turbine valve is connected with the supporting assembly, the supporting assembly is used for fixedly supporting the steam turbine valve, and the steam turbine valve comprises a main steam valve shell; through a double-electric-push-rod driving structure, valve opening hierarchical control, small-flow conduction during single-rod action and large-flow conduction during double-rod synchronization are achieved, the working condition requirements of small-flow starting and stopping and full-load large-flow starting and stopping of a steam turbine are precisely met, and a main steam valve shell is provided with a pressure detector for monitoring steam pressure in real time; a liquid level sensor is linked with a sealing drainage assembly, condensate water is drained in time, accumulated water is prevented from corroding a sealing face and parts, the sealing performance of the valve is effectively improved, the service life of the valve is effectively prolonged, and the problems that a traditional valve is single in adjustment, and leakage and structural damage are caused by accumulated condensate water are solved.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a steam turbine valve device and a fault detection component. Background Art

[0002] A steam turbine is a rotary power machine that converts the thermal energy of steam into mechanical energy. It originated in the late 19th century and has been continuously improved with the needs of industrial development. Its working principle is based on steam driving the impeller to rotate. It has the advantages of high efficiency, high power, and smooth operation. It is widely used in the fields of electricity, ships, industrial drives, etc. It is an indispensable and important power equipment in modern industry and has played a key role in promoting social and economic development.

[0003] Chinese patent CN202411845463.8 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 drive 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 exhaust 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.

[0004] According to the above-mentioned prior art, it is found that a single LVDT sensor is set for each steam inlet valve in the original steam turbine, and its working environment is high temperature and high vibration, which is prone to mechanical wear and equipment aging, resulting in output value fluctuations, causing the valve to vibrate at a certain position, affecting the stability of the unit load regulation. In addition, since there is only a single LVDT detection device, when one of the LVDT feedback outputs fails, the valve control loop cannot work normally, and during the operation of the main steam valve of the steam turbine, the temperature in the pipeline drops or changes, which will produce condensed water. After accumulation, it enters the valve with the steam, thereby causing the condensed water to accumulate inside the main steam valve of the steam turbine, which will accelerate the corrosion of the valve sealing surface, valve core, and valve seat, resulting in a decrease in sealing performance and leakage problems.

[0005] Therefore, it is necessary to solve the above problems through a steam turbine valve device and a fault detection component. Summary of the invention

[0006] The object of the present invention is to provide a steam turbine valve device and a fault detection component to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a steam turbine valve device, comprising a steam turbine valve and a support assembly, wherein the bottom of the steam turbine valve is connected to the support assembly, and the support assembly is used to fix and support the steam turbine valve, wherein the steam turbine valve comprises a main steam valve housing, a pressure detector is provided on the top of the main steam valve housing, an air inlet pipe and an air outlet pipe are respectively provided on the outer surface of the main steam valve housing, and the air inlet pipe and the air outlet pipe are both used to transport steam, and two symmetrically arranged bearing plates are provided on the surface of the main steam valve housing, a support rod is provided between the two bearing plates, and the support rod is used to support the two bearing plates; The supporting assembly includes a first baffle plate, a second valve cover is movably provided inside the first baffle plate, and a first valve cover is movably provided inside the second valve cover, the first valve cover and the second valve stem are used for sealing the air inlet pipe and the air outlet pipe, a first valve stem is provided at the bottom of the second valve cover, a plurality of conveying holes are provided on the outer surface of the end of the first valve stem close to the second valve cover, and the first valve stem conveys the steam in the air inlet pipe to the air outlet pipe through the conveying holes.

[0008] Preferably, a third return spring is provided inside the second valve stem, a baffle is provided at the other end of the third return spring, and a first valve stem is provided on the inner diameter of the baffle, the third return spring and the baffle are used to reset the first valve stem, and the end of the first valve stem close to the second valve cover is connected to the bottom of the first valve cover; A second sealing ring is provided on the outer surface of the second valve stem, and the second sealing ring is used to seal the top area of ​​the main air valve housing. A second sealing rod is movably provided inside the second sealing ring, and a second return spring is provided on the outer surface of the second sealing rod. The second return spring is used to reset the second sealing rod. When the second sealing rod slides out to the bottom of the second sealing ring, the second return spring is in a compressed state, and the second sealing ring is not in a sealed state.

[0009] Preferably, the support assembly further comprises a base shell, the bottom of the inner wall of the base shell is respectively provided with a first electric push rod and a second electric push rod, and the first electric push rod and the second electric push rod are symmetrically arranged at the bottom of the inner wall of the base shell, and two wedge-shaped limit blocks are symmetrically arranged on one side of the inner wall of the base shell close to the first electric push rod and the second electric push rod, and the left and right sides of the base shell are provided with discharge pipes; The output ends of the first electric push rod and the second electric push rod are both provided with a second hinged part, and the first electric push rod and the second electric push rod are both movably provided with a driving plate through the second joint, and rubber rings are provided on the edges around the driving plate, and the outer surface of the rubber ring is tightly fitted with the inner wall of the base shell around.

[0010] Preferably, a driving shell is provided on the surface of the driving plate, the interior of the driving shell is in contact with the bottom end of the second valve stem, and a transverse movable groove is provided on the side of the driving shell close to the second valve stem, the transverse movable groove forms a limit with the bottom of the second valve stem, and the transverse movable groove is used to provide movable space for the driving shell to deflect left and right.

[0011] Preferably, the surface of the driving plate is in contact with the bottom end of the first valve stem, and when the first electric push rod and the second electric push rod are in the first working state, the driving plate moves longitudinally along the interior of the base shell and applies a squeezing force to the bottom of the first valve stem, the first valve stem slides longitudinally along the interior of the second valve stem, the first valve cover is separated from the second valve stem, and the third return spring is in a compressed state, and the air inlet pipe is connected to the air outlet pipe; When the first electric push rod and the second electric push rod are in the second working state, the drive plate moves longitudinally along the interior of the base shell and applies extrusion force to the bottom of the first valve stem and the second valve stem respectively, the first valve stem and the second valve stem slide longitudinally, the first valve cover and the second valve cover are separated from the first baffle at the same time, and the third return spring is in a compressed state, and the air inlet pipe and the air outlet pipe are connected to each other.

[0012] Preferably, a first sealing ring is fixedly provided at the bottom of the main steam valve housing, and a first sealing rod is movably provided inside the first sealing ring, and a first return spring is provided on the outer surface of the first sealing rod, the first return spring is used to reset the first sealing rod, and the first sealing rod is used to seal the first sealing ring, when the first sealing rod slides out to the bottom of the first sealing ring, the first return spring is in a compressed state, and the first sealing ring is not in a sealed state, a trigger ring is provided on the inner wall of the main steam valve housing close to the second sealing ring, and a liquid level sensor is provided on the surface of the trigger ring, and the liquid level sensor is used to perform real-time detection of the water accumulation state in the area above the second sealing ring.

[0013] The present invention also provides a fault detection component, which is used to detect the turbine valve device described in any of the aforementioned technical solutions. The fault detection component is fixedly arranged inside the support component, and the fault detection component is used to detect the switching state of the turbine valve device in real time.

[0014] Preferably, the fault detection component includes a fixed rod, a first joint is fixedly provided at the end of the fixed rod, an LVDT body is movably provided at the end of the fixed rod through a first hinge, a protective shell is provided on the outer surface of the LVDT body, two secondary coils are symmetrically provided inside the LVDT body, a primary coil is provided between the two secondary coils, a connecting rod is movably provided inside the LVDT body, and an iron core is provided at the end of the connecting rod close to the primary coil.

[0015] Preferably, a stabilizing plate is provided on the outer surface of the protective shell, a power supply cable is provided inside the stabilizing plate, and one end of the power supply cable close to the protective shell is electrically connected to the LVDT body, and an insulating waterproof layer is provided on the outer side of the power supply cable.

[0016] Technical effects and advantages of the present invention: 1. The present invention realizes graded control of valve opening through a dual electric push rod driving structure. When a single rod is actuated, a small flow is conducted, and when the dual rods are synchronized, a large flow is conducted. It accurately adapts to the working conditions of small flow at start and stop of the steam turbine and large flow at full load. A pressure detector is set on the main steam valve casing to monitor the steam pressure in real time, and the load-bearing plate and support rod are used to enhance the structural stability. The liquid level sensor is linked to the sealing and drainage assembly to discharge condensed water in time to avoid corrosion of the sealing surface and components by accumulated water, effectively improving the sealing performance and service life of the valve, and solving the problems of leakage and structural damage caused by single adjustment of traditional valves and accumulation of condensed water.

[0017] 2. The fault detection component in the present invention adopts an LVDT body with symmetrically arranged double secondary coils, and senses the valve stem displacement in real time through the connecting rod and the iron core. Compared with the traditional single sensor, it has higher detection accuracy and stronger anti-interference ability, can accurately feedback the valve switch status, and reduce the signal fluctuation problem caused by equipment aging or vibration. The protective shell is equipped with an insulating waterproof layer to withstand high-temperature steam environment. The stabilizing plate and hinge design can also compensate for valve vibration and installation deviation to ensure stable operation of the detection component. This design realizes real-time monitoring of the valve status, can detect abnormal hidden dangers at an early stage and issue early warnings, effectively improve the reliability of the turbine valve control circuit, ensure the stability of the unit load regulation, and reduce the risk of potential failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention in an open state; Figure 3 It is a schematic diagram of the assembly state of the first sealing ring and the second sealing ring structure of the present invention; Figure 4 This is a schematic diagram of the fault detection component and related structures of the present invention; Figure 5 It is a schematic diagram of the assembly state of the secondary coil and the primary coil structure of the present invention; Figure 6 This is a schematic diagram of the installation positions of the first electric push rod and the second electric push rod structure of the present invention; Figure 7 This is a schematic diagram of the installation state of the rubber ring and the driving plate structure of the present invention; Figure 8 It is a schematic diagram of the installation state of the drive housing and the second valve stem structure of the present invention; Fig. 9 It is a schematic diagram of the assembly state of the first valve stem and the third return spring structure of the present invention.

[0019] In the figure: 1. turbine valve; 101. pressure detector; 102. air inlet pipe; 103. air outlet pipe; 104. load-bearing plate; 105. support rod; 106. main steam valve housing; 2. support assembly; 201. base housing; 202. discharge pipe; 203. fault detection assembly; 2031. fixing rod; 2032. first hinge; 2033. LVDT body; 2034. protective housing; 2035. stabilizing plate; 2036. power supply cable; 2037. connecting rod; 2038. secondary coil; 2039. primary coil; 204. drive Dynamic housing; 205, first valve stem; 206, first sealing ring; 2061, first blocking rod; 2062, first return spring; 207, second sealing ring; 2071, second blocking rod; 2072, second return spring; 208, first valve cover; 209, first baffle plate; 210, first electric push rod; 211, second electric push rod; 212, wedge-shaped limit block; 213, second valve stem; 2131, baffle plate; 2132, third return spring; 214, drive plate; 2141, rubber ring; 2142, second hinge; 215, second valve cover. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] First embodiment The present invention provides Figures 1 to 9A steam turbine valve device shown in the figure comprises a steam turbine valve 1 and a support assembly 2, the bottom of the steam turbine valve 1 is connected to the support assembly 2, the support assembly 2 is used to fix and support the steam turbine valve 1, the steam turbine valve 1 comprises a main steam valve housing 106, the top of the main steam valve housing 106 is provided with a pressure detector 101, the outer surface of the main steam valve housing 106 is respectively provided with an inlet pipe 102 and an outlet pipe 103, the inlet pipe 102 and the outlet pipe 103 are both used to transport steam, the surface of the main steam valve housing 106 is provided with two symmetrically arranged bearing plates 104, and a support plate 104 is provided between the two bearing plates 104. Rod 105, and the support rod 105 is used to support the two load-bearing plates 104, the support assembly 2 includes a first baffle plate 209, the interior of the first baffle plate 209 is movably provided with a second valve cover 215, and the interior of the second valve cover 215 is movably provided with a first valve cover 208, the first valve cover 208 and the second valve stem 213 are used to seal the air inlet pipe 102 and the air outlet pipe 103, the bottom of the second valve cover 215 is provided with a first valve stem 205, the outer surface of the end of the first valve stem 205 close to the second valve cover 215 is provided with a plurality of conveying holes, and the first valve stem 205 conveys the steam in the air inlet pipe 102 to the air outlet pipe 103 through the conveying holes.

[0022] Specifically, when steam enters the main steam valve housing 106 through the air inlet pipe 102, the pressure detector 101 on the top monitors the internal steam pressure in real time, the air inlet pipe 102 and the air outlet pipe 103 on the outside form a steam transmission path, and the load-bearing plates 104 on both sides of the main steam valve housing 106 support each other through the support rods 105 to form a stable triangular force-bearing structure, which evenly distributes the valve weight and steam impact force to the support assembly 2; in the first baffle 209 of the support assembly 2, the second valve cover 215 is nested with the first valve cover 208, and the first valve stem 205 runs through the second valve cover 215, and the delivery hole at its end connects or cuts off the air inlet pipe 102 and the air outlet pipe 103 when the valve stem moves. The pressure is monitored in real time by the pressure detector 101, the structural support of the load-bearing plate 104 and the support rod 105, and the sealing cooperation between the first valve cover 208, the second valve cover 215 and the first valve stem 205, so as to achieve the effects of real-time monitoring of steam pressure, stable support of valve structure and pipeline on-off control, and solve the problems of deformation and leakage of traditional valves due to weak supporting structure and untimely pressure monitoring.

[0023] A third return spring 2132 is provided inside the second valve stem 213, and a baffle 2131 is provided at the other end of the third return spring 2132, and the inner diameter of the baffle 2131 is provided with the first valve stem 205, the third return spring 2132 and the baffle 2131 are used to reset the first valve stem 205, the end of the first valve stem 205 close to the second valve cover 215 is connected to the bottom of the first valve cover 208, and a second sealing ring 207 is provided on the outer surface of the second valve stem 213, and the second sealing ring 207 is used to seal the top area of ​​the main air valve housing, and a second blocking rod 2071 is movably provided inside the second sealing ring 207, and a second return spring 2072 is provided on the outer surface of the second blocking rod 2071, and the second return spring 2072 is used to reset the second blocking rod 2071, and when the second blocking rod 2071 slides out to the bottom of the second sealing ring 207, the second return spring 2072 is in a compressed state, and the second sealing ring 207 is not in a sealed state.

[0024] Specifically, one end of the third return spring 2132 inside the second valve stem 213 is connected to the baffle 2131. When the first valve stem 205 slides upward due to external force, the baffle 2131 moves with the first valve stem 205 and compresses the third return spring 2132. After the external force is removed, the third return spring 2132 pushes the first valve stem 205 to reset through the baffle 2131; at the same time, the second sealing ring 207 on the outside of the second valve stem 213 seals the top area of ​​the main steam valve housing 106. Under the action of the second return spring 2072, the second sealing rod 2071 in the second sealing ring 207 presses against the sealing ring to maintain the seal in a normal state. When the second sealing rod 2071 slides to the bottom of the sealing ring due to external force, the second return spring 2072 is compressed, and the sealing ring loses its sealing function.

[0025] The support assembly 2 also includes a base shell 201, and the bottom of the inner wall of the base shell 201 is respectively provided with a first electric push rod 210 and a second electric push rod 211, and the first electric push rod 210 and the second electric push rod 211 are symmetrically arranged at the bottom of the inner wall of the base shell 201, and two wedge-shaped limit blocks 212 are symmetrically provided on one side of the inner wall of the base shell 201 close to the first electric push rod 210 and the second electric push rod 211, and the left and right sides of the base shell 201 are provided with discharge pipes 202, and the output ends of the first electric push rod 210 and the second electric push rod 211 are provided with second hinges 2142, and the first electric push rod 210 and the second electric push rod 211 are movably provided with a drive plate 214 through a second joint, and the edges of the drive plate 214 are provided with rubber rings 2141, and the outer surface of the rubber ring 2141 is tightly fitted around the inner wall of the base shell 201.

[0026] Specifically, in the base housing 201 of the support assembly 2, the symmetrically arranged first electric push rod 210 and the second electric push rod 211 control the longitudinal movement of the driving plate 214 through the second hinge 2142 at the output end, and the rubber ring 2141 at the edge of the driving plate 214 is tightly fitted with the inner wall of the base housing 201 to form a relatively sealed space (when the first electric push rod 210 and the second electric push rod 211 are controlled to apply pressure to the driving plate 214, the air will escape from the gap between the rubber ring 2141 and the inner wall of the base housing 201 after being compressed to a certain extent, and when the accumulated water reaches the driving plate 2 14, since the pressure does not exceed the ultimate bearing range of the rubber ring 2141, the accumulated water will not enter the bottom area of ​​the base shell 201). The wedge-shaped limit block 212 on the inner wall of the base shell 201 is used to guide the accumulated water to the discharge pipe 202 and discharge it to the outside. The discharge pipes 202 on the left and right sides are used to discharge impurities or accumulated liquid in the area above the drive plate 214. The first and second electric push rods 211 control the drive plate 214, the rubber ring 2141 seals and the wedge-shaped limit block 212 cooperate to achieve the effects of precise control of the travel of the drive plate 214, dust and water resistance of the drive mechanism and discharge of impurities.

[0027] A driving shell 204 is provided on the surface of the driving plate 214, and the interior of the driving shell 204 is in contact with the bottom end of the second valve stem 213. A transverse movable groove is provided on the side of the driving shell 204 close to the second valve stem 213, and the transverse movable groove forms a limit with the bottom of the second valve stem 213, and the transverse movable groove is used to provide movable space for the driving shell 204 to deflect left and right.

[0028] Specifically, the interior of the driving shell 204 on the surface of the driving plate 214 contacts the bottom end of the second valve stem 213, and the transverse movable groove on its side provides transverse movable space for the bottom of the second valve stem 213. When the driving plate 214 is slightly deflected due to the inconsistent telescopic lengths of the first and second electric push rods 211, the second valve stem 213 can move slightly in the transverse movable groove, and the groove structure forms a limit on the valve stem, so that the driving plate 214 can drive the driving shell 204 to deflect laterally (using the movable range provided by the transverse movable groove).

[0029] The surface of the driving plate 214 contacts the bottom end of the first valve stem 205. When the first electric push rod 210 and the second electric push rod 211 are in the first working state, the driving plate 214 moves longitudinally along the inside of the base shell 201 and applies a squeezing force to the bottom of the first valve stem 205. The first valve stem 205 slides longitudinally along the inside of the second valve stem 213. The first valve cover 208 is separated from the second valve stem 213, and the third return spring 2132 is in a compressed state. The air inlet pipe 102 and the air outlet pipe 103 are mutually closed. When the first electric push rod 210 and the second electric push rod 211 are in the second working state, the driving plate 214 moves longitudinally along the interior of the base shell 201 and applies extrusion force to the bottom of the first valve stem 205 and the second valve stem 213 respectively, and the first valve stem 205 and the second valve stem 213 slide longitudinally, the first valve cover 208 and the second valve cover 215 are disengaged from the first baffle 209 at the same time, and the third return spring 2132 is in a compressed state, and the air inlet pipe 102 and the air outlet pipe 103 are connected to each other.

[0030] Specifically, when the first electric push rod 210 and the second electric push rod 211 are in the first working state (such as single-rod action), the driving plate 214 moves longitudinally and pushes the bottom of the first valve stem 205, so that the first valve stem 205 slides along the inside of the second valve stem 213, the first valve cover 208 is separated from the second valve stem 213, the third return spring 2132 is compressed, and the air inlet pipe 102 and the air outlet pipe 103 are connected through the delivery hole of the first valve stem 205, so as to achieve small flow conduction; when in the second working state (double-rod synchronous action), the driving plate 214 pushes the first valve stem 205 and the second valve stem 213 at the same time, so that the first valve cover 208 and the second valve cover 215 are separated from the first baffle 209, and the third return spring 2132 is compressed, and the air inlet pipe 102 is fully connected with the air outlet pipe 103, so that a large flow is conducted. By using the different driving modes of the valve stem under the two working states of the electric push rod, the valve opening is controlled in stages to meet the flow requirements of the turbine under different working conditions, and the problem that the single opening of the traditional valve cannot take into account the regulation of small flow at start and stop and large flow at full load is solved.

[0031] A first sealing ring 206 is fixedly provided at the bottom of the main steam valve housing 106, and a first sealing rod 2061 is movably provided inside the first sealing ring 206, and a first return spring 2062 is provided on the outer surface of the first sealing rod 2061, the first return spring 2062 is used to reset the first sealing rod 2061, and the first sealing rod 2061 is used to seal the first sealing ring 206, when the first sealing rod 2061 slides out to the bottom of the first sealing ring 206, the first return spring 2062 is in a compressed state, and the first sealing ring 206 is not in a sealed state, a trigger ring is provided on the inner wall of the main steam valve housing 106 near the second sealing ring 207, and a liquid level sensor is provided on the surface of the trigger ring, and the liquid level sensor is used to perform real-time detection of the water accumulation state in the area above the second sealing ring 207.

[0032] Specifically, when the second sealing ring 207 is controlled to move toward the top of the main steam valve housing 106, the top of the second sealing rod 2071 is brought into contact with the bottom of the trigger ring, and the trigger ring is used to squeeze the top of the second sealing rod 2071, so that the second sealing rod 2071 slides downward in the second sealing ring 207. At this time, the accumulated water in the area above the second sealing ring 207 can be guided to the area between the first sealing ring 206 and the second sealing ring 207. Subsequently, the first electric push rod 210 and the second electric push rod 211 are gradually contracted, so that the bottom of the trigger ring does not produce a squeezing force on the top of the second sealing rod 2071, and the second return spring 2072 is contracted to automatically contract the second sealing rod 2071. Reset, at this time, the area between the second sealing ring 207 and the first sealing ring 206 becomes a sealing area, and then, the first sealing rod 2061 is movably set in the first sealing ring 206 at the bottom of the main steam valve housing 106, and the first reset spring 2062 on the outer side of the first sealing rod 2061 maintains its sealing to the sealing ring under normal conditions. When the second sealing ring 207 is controlled to move in the direction of the first sealing ring 206, the pressure in the area between the first sealing ring 206 and the second sealing ring 207 increases, so that the first sealing rod 2061 slides out to the bottom of the sealing ring, the first reset spring 2062 is compressed, and the sealing ring loses its sealing function. At this time, the accumulated water generated in the process of conveying steam can be guided to the surface of the driving plate 214.

[0033] The present invention also provides a fault detection component, the fault detection component 203 is used to detect the turbine valve device of any one of the above technical solutions, the fault detection component 203 is fixedly arranged inside the support component 2, and the fault detection component 203 is used to detect the switch state of the turbine valve device 1 in real time, the fault detection component 203 includes a fixed rod 2031, the end of the fixed rod 2031 is fixedly provided with a first intersection, the end of the fixed rod 2031 is movably provided with an LVDT body 2033 through a first hinge 2032, and the outer surface of the LVDT body 2033 is provided with a protective shell 2034, Two secondary coils 2038 are symmetrically arranged inside the LVDT body 2033, and a primary coil 2039 is arranged between the two secondary coils 2038. A connecting rod 2037 is movably arranged inside the LVDT body 2033, and an iron core is arranged at the end of the connecting rod 2037 close to the primary coil 2039. A stabilizing plate 2035 is arranged on the outer surface of the protective shell 2034, and a power supply cable 2036 is connected to the inside of the stabilizing plate 2035. One end of the power supply cable 2036 close to the protective shell 2034 is electrically connected to the LVDT body 2033, and an insulating waterproof layer is arranged on the outer side of the power supply cable 2036.

[0034] Specifically, the fault detection component 203 is fixed inside the support component 2, and is linked with the valve stem, drive mechanism, etc. of the steam turbine valve 1 device. By real-time monitoring of the position and state parameters of the drive plate 214 (drive plate 214 stroke), it is determined whether the switch state of the valve is normal. By integrating the detection component into the support component 2, the real-time monitoring of the valve operation state and the early detection of abnormal hidden dangers are achieved, which solves the problems of delayed traditional manual detection and untimely fault judgment.

[0035] Subsequently, the protective shell 2034 on the outside of the LVDT body is fixed by a stabilizing plate 2035, and the power supply cable 2036 in the stabilizing plate 2035 supplies power to the LVDT body and transmits signals. The insulating waterproof layer on the outside of the power supply cable 2036 prevents water vapor or corrosive gases in the steam environment from affecting the safety of the line. By fixing with the stabilizing plate 2035, connecting the power supply cable 2036 and protecting with the insulating waterproof layer, the detection component is stably installed, the signal transmission is stable and the environmental interference resistance is achieved, and the problem of easy damage of the detection equipment and easy distortion of the signal in a humid and high-temperature environment is solved.

[0036] The LVDT body is the core of the fault detection component 203. Its working principle is based on the electromagnetic induction differential principle. The specific process is as follows: after the primary coil 2039 is connected to high-frequency alternating current, an alternating magnetic field is generated. The iron core located in the center of the two symmetrical secondary coils 2038 is rigidly connected to the first valve stem 205 through the connecting rod 2037. It moves axially in the primary coil 2039 as the valve stem moves longitudinally. When the iron core is at the center of the primary coil 2039 (zero position), the induced electromotive force of the two anti-phase series-connected secondary coils 2038 is equal in magnitude and opposite in phase, and the differential output voltage is 0V, corresponding to the valve closed state; if the valve stem moves upward (the valve is opened), the iron core moves toward one end of the primary coil 2039, so that the magnetic flux of the upper secondary coil 2038 increases and the magnetic flux of the lower one decreases. The differential output of the two is a positive voltage proportional to the displacement, and vice versa. A negative voltage is output, thereby reflecting the direction and magnitude of the valve stem displacement through the amplitude and polarity of the voltage signal.

[0037] After the signal is generated, the LVDT body fixed to the support component 2 by the stabilizing plate 2035 transmits the differential voltage signal through the power supply cable 2036. The insulating waterproof layer on the outside of the cable isolates the water vapor and corrosive gas in the steam environment to ensure signal stability. The external signal conditioning circuit performs phase-sensitive detection and filtering on the voltage signal, and converts it into a DC voltage that is linearly related to the valve stem displacement (such as 0-5V corresponds to 0-10mm full stroke), and real-time feedback of the valve opening. The specially designed fixing rod 2031 is connected to the support component 2 through the first hinge 2032, allowing the LVDT body to be adaptively adjusted at a small angle, compensating for valve vibration or installation deviation, and avoiding stress damage to the connecting rod 2037; the stainless steel protective shell 2034 is filled with an insulating layer to withstand high-temperature steam (≤400℃) and electromagnetic interference. With the rigid fixation of the stabilizing plate 2035, the vibration impact is controlled within an amplitude of 0.05mm, ensuring that the core displacement is transmitted without lag (response time <1ms).

[0038] Secondly, after the signal is generated, the LVDT body fixed to the support component 2 by the stabilizing plate 2035 transmits the differential voltage signal through the power supply cable 2036. The insulating waterproof layer on the outside of the cable isolates the water vapor and corrosive gas in the steam environment to ensure signal stability. The external signal conditioning circuit performs phase-sensitive detection and filtering on the voltage signal, and converts it into a DC voltage that is linearly related to the valve stem displacement (such as 0-5V corresponds to 0-10mm full stroke), and real-time feedback of the valve opening. The specially designed fixing rod 2031 is connected to the support component 2 through the first hinge 2032, allowing the LVDT body to be adaptively adjusted at a small angle, compensating for valve vibration or installation deviation, and avoiding stress damage to the connecting rod 2037. The stainless steel protective shell 2034 is filled with an insulating layer to withstand high-temperature steam (≤400℃) and electromagnetic interference. With the rigid fixation of the stabilizing plate 2035, the vibration impact is controlled within an amplitude of 0.05mm, ensuring that the core displacement is transmitted without lag (response time <1ms).

[0039] Second embodiment According to the first embodiment, it is found that during the long-term steam transportation process, the temperature difference changes due to the environment of the main steam valve housing 106 or other external reasons (the temperature of a certain area of ​​the main steam valve housing 106 is lower than the preset value, which will cause part of the steam being transported to become water and accumulate above the second sealing ring 207 during the transportation process). When the accumulated water rises to the warning position, active drainage is required. If the accumulated water is not discharged to the outside in time, it will not only cause the accumulated water to accumulate inside the main steam valve housing for a long time, causing the parts structure inside the main steam valve housing to corrode and rust, reducing the service life of the main steam valve housing 106, but also cause the water to be transported to the inside of the steam turbine during the steam transportation process, which will cause damage to the parts in the steam turbine. Based on this, the present invention proposes a second embodiment, and the specific adjustment process is as follows: The liquid level sensor above the trigger ring is used to detect the accumulated water in the area above the second sealing ring 207 in real time. Since the trigger ring is located above the second sealing ring 207 and lower than the position of the air outlet pipe 103, the amount of accumulated water generated by the steam can be detected in real time.

[0040] If the liquid level sensor detects that the amount of accumulated water has exceeded or reached the warning position, the first electric push rod 210 and the second electric push rod 211 are controlled to drive the drive plate 214 to move upward, and then the drive plate 214 applies a squeezing force to the bottom ends of the first valve stem 205 and the second valve stem 213 respectively, so that the first valve stem 205 and the second valve stem 213 move longitudinally inside the main steam valve housing 106. During this process, since the second sealing ring 207 is fixedly connected to the outer surface of the second valve stem 213, the second valve stem 213 drives the second sealing ring 207 during the movement. The trigger ring 207 moves upward and causes the bottom of the trigger ring to press against the top of the second blocking rod 2071, causing the second blocking rod 2071 to slide out from the inside of the second sealing ring 207 toward the bottom. At this time, the second sealing ring 207 is no longer in a sealed state, and the accumulated water in the area above the second sealing ring 207 flows through the space between the second blocking rod 2071 and the second sealing ring 207 to the area between the first sealing ring 206 and the second sealing ring 207. Since the first sealing ring 206 is still in a sealed state, the accumulated water accumulates in the area above the first sealing ring 206. Then, the second sealing ring 207 is controlled to move toward the first sealing ring 206 through the first and second electric push rods 211, so that the pressure between the second sealing ring 207 and the first sealing ring 206 increases, forcing the first blocking rod 2061 on the first sealing ring 206 to slide downward inside the first sealing ring 206, and discharge the accumulated water to the top of the driving plate 214, and then the extension amounts of the first electric push rod 210 and the second electric push rod 211 are controlled to be in different states (the first electric push rod 210 is higher than the second electric push rod 211 or the second electric push rod 211 is higher than the first electric push rod 210). In this way, the second hinge 2142 is used to make the driving plate 214 deflect in any direction of the two symmetrically arranged discharge pipes 202 (at this time, the rubber ring 2141 located around the driving plate 214 will generate extrusion pressure with the inner wall of the base shell 201, so that the rubber ring 2141 will be in a state of compression and deformation, and the deflection angle of the driving plate 214 is within the bearing range of the rubber ring 2141), so as to utilize the inclination of the driving plate 214 to guide the accumulated water in the area above the driving plate 214 to the discharge pipe 202 and discharge it outward in cooperation with the wedge-shaped limit block 212.

[0041] It should be noted that: when the driving plate 214 is offset, if the first electric push rod 210 is higher than the second electric push rod 211 (the difference in elongation is preset in advance based on the rubber pad and the maximum angle at which the driving plate 214 can deflect in the space inside the base shell 201, and the deflection range of the driving plate 214 is not higher than 25°), the pressure on the side of the rubber ring 2141 close to the second electric push rod 211 will gradually increase, so that in the process of guiding the accumulated water to be discharged outward in cooperation with the discharge pipe 202, the accumulated water will not flow to the bottom area of ​​the base shell 201.

[0042] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steam turbine valve device, comprising a steam turbine valve (1) and a support assembly (2), wherein the bottom of the steam turbine valve (1) and the support assembly (2) are connected to each other, and the support assembly (2) is used to fix and support the steam turbine valve (1), characterized in that: The steam turbine valve (1) comprises a main steam valve housing (106), a pressure detector (101) is provided on the top of the main steam valve housing (106), an air inlet pipe (102) and an air outlet pipe (103) are provided on the outer surface of the main steam valve housing (106), the air inlet pipe (102) and the air outlet pipe (103) are both used to transport steam, and two symmetrically arranged bearing plates (104) are provided on the surface of the main steam valve housing (106), a support rod (105) is provided between the two bearing plates (104), and the support rod (105) is used to support the two bearing plates (104); The support assembly (2) comprises a first baffle (209), a second valve cover (215) is movably provided inside the first baffle (209), and a first valve cover (208) is movably provided inside the second valve cover (215), the first valve cover (208) and the second valve stem (213) are used to seal the air inlet pipe (102) and the air outlet pipe (103), a first valve stem (205) is provided at the bottom of the second valve cover (215), and a plurality of conveying holes are provided on the outer surface of the end of the first valve stem (205) close to the second valve cover (215), and the first valve stem (205) conveys the steam in the air inlet pipe (102) to the air outlet pipe (103) through the conveying holes.

2. The steam turbine valve device according to claim 1, characterized in that: A third return spring (2132) is provided inside the second valve stem (213), a baffle (2131) is provided at the other end of the third return spring (2132), and a first valve stem (205) is provided on the inner diameter of the baffle (2131), the third return spring (2132) and the baffle (2131) are used to return the first valve stem (205), and an end of the first valve stem (205) close to the second valve cover (215) is connected to the bottom of the first valve cover (208); A second sealing ring (207) is provided on the outer surface of the second valve stem (213), and the second sealing ring (207) is used to seal the top area of ​​the main air valve housing. A second blocking rod (2071) is movably provided inside the second sealing ring (207), and a second return spring (2072) is provided on the outer surface of the second blocking rod (2071). The second return spring (2072) is used to reset the second blocking rod (2071). When the second blocking rod (2071) slides out to the bottom of the second sealing ring (207), the second return spring (2072) is in a compressed state, and the second sealing ring (207) is not in a sealed state.

3. The steam turbine valve device according to claim 2, characterized in that: The support assembly (2) further comprises a base shell (201), wherein a first electric push rod (210) and a second electric push rod (211) are respectively provided at the bottom of the inner wall of the base shell (201), and the first electric push rod (210) and the second electric push rod (211) are symmetrically arranged at the bottom of the inner wall of the base shell (201), and two wedge-shaped limit blocks (212) are symmetrically provided on one side of the inner wall of the base shell (201) close to the first electric push rod (210) and the second electric push rod (211), and discharge pipes (202) are provided on both left and right sides of the base shell (201); The output ends of the first electric push rod (210) and the second electric push rod (211) are both provided with a second hinged member (2142); the first electric push rod (210) and the second electric push rod (211) are both movably provided with a drive plate (214) via a second joint; and the edges of the drive plate (214) are all provided with a rubber ring (2141); and the outer surface of the rubber ring (2141) is tightly fitted with the inner wall of the base shell (201) on all sides.

4. The steam turbine valve device according to claim 3, characterized in that: A driving shell (204) is provided on the surface of the driving plate (214), the interior of the driving shell (204) is in contact with the bottom end of the second valve stem (213), and a transverse movable groove is provided on a side of the driving shell (204) close to the second valve stem (213), the transverse movable groove and the bottom of the second valve stem (213) form a limit, and the transverse movable groove is used to provide movable space for the driving shell (204) to deflect left and right.

5. The steam turbine valve device according to claim 4, characterized in that: The surface of the drive plate (214) is in contact with the bottom end of the first valve stem (205). When the first electric push rod (210) and the second electric push rod (211) are in a first working state, the drive plate (214) moves longitudinally along the inside of the base shell (201) and applies a squeezing force to the bottom of the first valve stem (205). The first valve stem (205) slides longitudinally along the inside of the second valve stem (213). The first valve cover (208) is separated from the second valve stem (213). The third return spring (2132) is in a compressed state. The air inlet pipe (102) and the air outlet pipe (103) are connected to each other. When the first electric push rod (210) and the second electric push rod (211) are in the second working state, the drive plate (214) moves longitudinally along the interior of the base shell (201) and applies extrusion force to the bottom of the first valve stem (205) and the second valve stem (213), respectively, the first valve stem (205) and the second valve stem (213) slide longitudinally, the first valve cover (208) and the second valve cover (215) are detached from the first baffle (209), and the third return spring (2132) is in a compressed state, and the air inlet pipe (102) and the air outlet pipe (103) are connected to each other.

6. The steam turbine valve device according to claim 2, characterized in that: A first sealing ring (206) is fixedly provided at the bottom of the main steam valve housing (106), and a first blocking rod (2061) is movably provided inside the first sealing ring (206), and a first return spring (2062) is provided on the outer surface of the first blocking rod (2061), the first return spring (2062) is used to reset the first blocking rod (2061), and the first blocking rod (2061) is used to seal the first sealing ring (206), when the first blocking rod (2061) slides out to the bottom of the first sealing ring (206), the first return spring (2062) is in a compressed state, and the first sealing ring (206) is not in a sealed state, and a trigger ring is provided on the inner wall of the main steam valve housing (106) close to the second sealing ring (207), and a liquid level sensor is provided on the surface of the trigger ring, and the liquid level sensor is used to detect the water accumulation state in the area above the second sealing ring (207) in real time.

7. A fault detection component, used for detecting the steam turbine valve device according to any one of claims 1 to 6, characterized in that: The fault detection component (203) is fixedly arranged inside the support component (2), and the fault detection component (203) is used to detect the switch state of the turbine valve (1) device in real time.

8. The fault detection component according to claim 7, characterized in that: The fault detection component (203) comprises a fixed rod (2031), a first joint piece is fixedly provided at the end of the fixed rod (2031), an LVDT body (2033) is movably provided at the end of the fixed rod (2031) via a first hinge piece (2032), a protective shell (2034) is provided on the outer surface of the LVDT body (2033), two secondary coils (2038) are symmetrically provided inside the LVDT body (2033), a primary coil (2039) is provided between the two secondary coils (2038), a connecting rod (2037) is movably provided inside the LVDT body (2033), and an iron core is provided at the end of the connecting rod (2037) close to the primary coil (2039).

9. The fault detection component according to claim 8, characterized in that: A stabilizing plate (2035) is provided on the outer surface of the protective shell (2034), a power supply cable (2036) is provided inside the stabilizing plate (2035), and one end of the power supply cable (2036) close to the protective shell (2034) is electrically connected to the LVDT body (2033), and an insulating waterproof layer is provided on the outer side of the power supply cable (2036).

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