A steam turbine high-pressure tripping device with online monitoring and maintenance functions

Abstract

The invention discloses a steam turbine high-pressure shutoff device with online monitoring and maintenance functions, including a safety oil passage, a pressure oil passage, a return oil passage, an intermediate oil passage, an intelligent pressure switch transmitter, a safety oil hydraulic damper, an online verification hydraulic damper, a normally open electromagnetic stop valve and four shutoff valve groups. The pressure oil passage is connected to the safety oil passage in sequence through the normally open electromagnetic stop valve and the safety oil hydraulic damper, and the safety oil passage is connected to the return oil passage through the intermediate oil passage; the four shutoff valve groups are connected in parallel in pairs and then in series on the intermediate oil passage; the online verification hydraulic dampers are respectively arranged at the rear ends of the two pairs of shutoff valve groups; the intelligent pressure switch transmitter is respectively arranged on the safety oil passage and the intermediate oil passage. The invention not only has the functions of online monitoring and maintenance, but also improves the safety margin of the entire steam turbine unit on the basis of comprehensively improving reliability and response speed.

Description

Technical Field

[0001] The invention belongs to the technical field of steam turbines, and in particular relates to a steam turbine high-pressure tripping device with online monitoring and maintenance functions. Background Art

[0002] The steam turbine high-pressure shutoff device is a very important safety protection device in the steam turbine system. With the development of technology and the technical needs of intelligent power plant construction, the working status of the steam turbine high-pressure shutoff device and its components in long-term operation needs to be monitored online in real time and meet the online maintenance function. At the same time, in order to comprehensively reduce the unplanned shutdown rate of the steam turbine unit, the reliability and rapidity of the steam turbine high-pressure shutoff device are required to be higher, and it is required to have automatic feedback and online maintenance functions when the solenoid valve fails. However, the steam turbine high-pressure shutoff devices currently in operation do not have real online monitoring and maintenance functions. Therefore, in order to promote the development of intelligent steam turbine control systems, it is necessary to develop steam turbine high-pressure shutoff devices with real online monitoring and maintenance functions. Summary of the invention

[0003] The present invention aims to solve the technical problems that the current high-pressure shutoff device of a steam turbine cannot effectively realize the online monitoring and maintenance functions, and when the unit is not shut down, the control oil temperature is too high and the energy consumption is too high when the control oil pump is started, and the whole device has a slow operation speed and a high failure rate under various turbine tripping conditions. The present invention provides a steam turbine high-pressure shutoff device with online monitoring and maintenance functions. The device not only has the online monitoring and maintenance functions, but also improves the safety margin of the entire steam turbine unit on the basis of comprehensively improving reliability and response speed.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A steam turbine high-pressure shutoff device with online monitoring and maintenance functions, characterized in that it includes a safety oil passage, a pressure oil passage, an oil return passage, an intermediate oil passage, an intelligent pressure switch transmitter, a safety oil hydraulic damper, an online verification hydraulic damper, a normally open electromagnetic stop valve and four shutoff valve groups, wherein the pressure oil passage is connected to the safety oil passage in sequence through the normally open electromagnetic stop valve and the safety oil hydraulic damper, and the safety oil passage is connected to the oil return passage through the intermediate oil passage; the shutoff valve group includes a threaded plug-in shutoff valve, a long The electromagnetic reversing valve with power function and the unloading valve with valve position monitoring and control function, the threaded plug-in stop valve are all connected to the pressure oil channel, the electromagnetic reversing valve is connected to the return oil channel, the four isolation valve groups are connected in parallel in pairs and then connected in series to the middle oil channel through the unloading valve; the online verification hydraulic dampers are respectively set at the rear ends of the two pairs of isolation valve groups; the intelligent pressure switch transmitter is respectively set on the safety oil channel and the middle oil channel between the two pairs of isolation valve groups, which is used to monitor the safety oil pressure on the safety oil channel and the middle oil pressure on the middle oil channel in real time;

[0006] When any solenoid reversing valve in the first pair of shut-off valve groups loses power, the pilot chamber pressure of the unloading valve connected in series with the solenoid reversing valve is released, and the valve core of the unloading valve opens under the action of the safety oil pressure. At this time, the intermediate oil pressure rises to the same value as the safety oil pressure.

[0007] When any solenoid reversing valve in the latter pair of shut-off valve groups loses power, the pilot chamber pressure of the unloading valve connected in series with the solenoid reversing valve is released, and the spool of the unloading valve opens under the action of the intermediate oil pressure. At this time, the intermediate oil pressure drops to the same value as the return oil pressure.

[0008] There are four intelligent pressure switch transmitters, one of which is connected between the previous online verification hydraulic damper and the latter pair of shut-off valve groups, and the remaining intelligent pressure switch transmitters are separately connected to the safety oil channel.

[0009] The steam turbine high-pressure shutoff device also includes a hydraulic integrated block with an internal oil passage, and the threaded plug-in stop valve, electromagnetic reversing valve and unloading valve in the shutoff valve group are all connected to the internal oil passage of the hydraulic integrated block.

[0010] The shut-off valve groups are respectively arranged on hydraulic integrated blocks in a mirror-symmetrical manner.

[0011] The threaded plug-in stop valve includes a valve seat, a valve housing, an adjusting screw-type stop valve core, a locking nut and a sealing member. A floating sealing connection structure is formed between the valve seat and the valve housing through a sealing member. The valve seat is installed in the hydraulic integrated block through the valve housing. Oil holes that are respectively connected to the internal oil channel and the inner cavity of the valve seat are evenly arranged on the valve seat. The valve seat and the hydraulic integrated block and the valve housing and the hydraulic integrated block are sealed by sealing members. The adjusting screw-type stop valve core includes a rod body, a valve core end and an adjusting end. The valve core end and the adjusting end are respectively located at two ends of the rod body. The adjusting end is located outside the valve housing and fixedly connected to the locking nut. The valve core end passes through the valve housing and is arranged in the valve seat. The rod body and the valve seat are sealed by a sealing member.

[0012] The sealing member comprises a sealing ring and at least one anti-extrusion ring, and the sealing ring cooperates with the anti-extrusion ring to seal.

[0013] The unloading valve includes a manual valve position control screw, a limit nut, a travel switch, a spring, a valve body, a solenoid valve mounting block, a transfer block and a unloading valve core. The solenoid valve mounting block is sealed and fixedly connected to the solenoid reversing valve and the transfer block respectively. The valve body is fixed in the hydraulic integrated block through the transfer block. The unloading valve core is arranged in the valve body. A mounting groove is arranged on the unloading valve core. One end of the manual valve position control screw is fixedly connected to the limit nut, and the other end passes through the solenoid valve mounting block and the transfer block in turn and then extends into the mounting groove. The spring is sleeved on the manual valve position control screw and is located between the mounting groove and the transfer block. The travel switch is fixed on the transfer block for detecting the travel of the manual valve position control screw.

[0014] A protective cover is fixed on the transfer block, and the travel switch is located inside the protective cover.

[0015] By adopting the above technical solution, the beneficial technical effects of the present invention are:

[0016] 1. The present invention adopts a steam turbine high-pressure shutoff device composed of a safety oil channel, a pressure oil channel, a return oil channel, an intermediate oil channel, an intelligent pressure switch transmitter, a safety oil hydraulic damper, an online verification hydraulic damper, a normally open electromagnetic stop valve and four shutoff valve groups. It not only has online monitoring and maintenance functions, but also improves the safety margin of the entire steam turbine unit on the basis of comprehensively improving reliability and response speed. It effectively solves the technical problems that the current steam turbine high-pressure shutoff device cannot effectively realize online monitoring and maintenance functions, and when the unit is not locked, the control oil temperature is too high and the energy consumption is too high when the control oil pump is started, and the entire device has a slow action speed and a high failure rate under various turbine trip conditions.

[0017] 2. The present invention can respectively monitor the safety oil pressure and the intermediate oil pressure in real time through four intelligent pressure switch transmitters, which is conducive to online and rapid judgment of the valve position change of the electromagnetic reversing valve.

[0018] 3. The threaded plug-in stop valve of the present invention has a specific structure, so that the device can infinitely adjust the flow rate between full closure and the maximum throttle diameter without pressure compensation, thus having the advantages of flexible and convenient operation and accurate control.

[0019] 4. The present invention uses a specifically structured unloading valve to enable the entire device to have the functions of manually controlling the valve position and electrically monitoring the valve position. On the one hand, the electromagnetic reversing valve can be completely isolated hydraulically when necessary to facilitate the inspection and replacement of the electromagnetic reversing valve. On the other hand, the position switch of the valve position can be used to detect whether the valve core is in place to ensure the safety of control.

[0020] 5. The present invention uses a normally open electromagnetic stop valve, which can energize the normally open electromagnetic stop valve and quickly cut off the pressure oil entering the safety oil channel when the electromagnetic reversing valve loses power after the control system receives the brake command. It actively accelerates the disappearance speed of the safety oil pressure of the entire turbine regulation system from the source; completely eliminates the problems of excessive control oil temperature and excessive energy consumption when starting the control oil pump when the unit is not locked, and ultimately greatly improves the rapidity and safety of the system's brake response. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the hydraulic principle diagram of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the present invention;

[0023] Figure 3 It is a structural schematic diagram of a threaded cartridge stop valve;

[0024] Figure 4 It is the structural diagram of the unloading valve.

[0025] Marked in the figure: 1. Safety oil channel, 2. Pressure oil channel, 3. Return oil channel, 4. Intermediate oil channel, 5. Intelligent pressure switch transmitter, 6. Safety oil hydraulic damper, 7. Online verification hydraulic damper, 8. Normally open solenoid stop valve, 9. Threaded plug-in stop valve, 10. Solenoid reversing valve, 11. Unloading valve, 12. Hydraulic integrated block, 13. Internal oil channel, 14. Valve seat, 15. Valve housing, 16. Adjusting screw type stop valve core, 17. Locking nut, 18. Seal, 19. Oil hole, 20. Manual valve position control screw, 21. Limit nut, 22. Travel switch, 23. Spring, 24. Valve body, 25. Solenoid valve mounting block, 26. Adapter block, 27. Unloading valve core, 28. Protective cover. DETAILED DESCRIPTION

[0026] Example 1

[0027] This embodiment provides a steam turbine high-pressure tripping device with online monitoring and maintenance functions, such as Figure 1 , 2 As shown, it includes a safety oil channel 1, a pressure oil channel 2, a return oil channel 3, an intermediate oil channel 4, an intelligent pressure switch transmitter 5, a safety oil hydraulic damper 6, an online verification hydraulic damper 7, a normally open electromagnetic stop valve 8 and four isolation valve groups. The structure, position and connection relationship of each component are as follows:

[0028] The pressure oil passage 2 is divided into two paths, one of which is connected to the four shut-off valve groups respectively to provide pressure oil for the four shut-off valve groups, and the other is connected to the safety oil passage 1 through the normally open electromagnetic stop valve 8 and the safety oil hydraulic damper 6 in sequence to convert the pressure oil into safety oil and enter the safety oil passage 1. In addition, the safety oil passage 1 is connected to the return oil passage 3 through the intermediate oil passage 4, and the number of the online verification hydraulic dampers 7 is preferably two, which are respectively arranged on the intermediate oil passage to convert the safety oil into return oil and enter the return oil passage 3.

[0029] The shut-off valve group includes a threaded plug-in stop valve 9, a solenoid reversing valve 10 with a long-term energizing function, and a relief valve 11 with a valve position monitoring and control function, which are connected in series in sequence. The threaded plug-in stop valve 9 is communicated with the pressure oil passage 2, and the solenoid reversing valve 10 is communicated with the return oil passage 3. The four shut-off valve groups are connected in parallel in pairs and then connected in series to the intermediate oil passage 4 through the relief valve 11, and two online verification hydraulic dampers 7 are respectively arranged at the rear ends of the two pairs of shut-off valve groups; specifically, the first pair of shut-off valve groups, the first online verification hydraulic damper 7, the second pair of shut-off valve groups and an online verification hydraulic damper 7 are connected in series to the intermediate oil passage 4 in sequence. When the coils of the solenoid reversing valves 10 in the four shut-off valve groups are energized, one of the pressure oil in the pressure oil passage 2 enters the pilot chamber of the relief valve 11 through the solenoid reversing valve 10, so that the relief valves 11 are all in a closed state. The other pressure oil enters the hydraulic damper through the normally open electromagnetic stop valve 8, is converted into safety oil, and then enters the safety oil channel 1, and then passes through the online verification hydraulic damper 7 in turn, and finally is converted into return oil and enters the return oil channel 3.

[0030] Furthermore, in order to facilitate the connection of each valve in the shut-off valve group, the present embodiment also designs a hydraulic integrated block 12. The hydraulic integrated block 12 is an existing conventional component and is a hydraulic connector specially designed according to the hydraulic principle diagram and the actual interface type of each component. It is provided with a number of internal oil passages 13 corresponding to each component, and the threaded plug-in stop valve 9, the solenoid reversing valve 10 and the unloading valve 11 are all connected to the internal oil passage 13 of the hydraulic integrated block 12.

[0031] The intelligent pressure switch transmitter 5 is respectively arranged on the safety oil passage 1 and the intermediate oil passage 4 between the two pairs of shut-off valve groups, and is used to monitor the safety oil pressure on the safety oil passage 1 and the intermediate oil pressure on the intermediate oil passage 4 in real time. The number of the intelligent pressure switch transmitters 5 is preferably four, one of which is connected between the previous online verification hydraulic damper 7 and the next pair of shut-off valve groups, and the remaining three intelligent pressure switch transmitters 5 are separately connected to the safety oil passage 1.

[0032] Furthermore, the intelligent pressure switch transmitter 5 can not only output analog and switch signals at the same time, but also be equipped with an intelligent bus communication interface. The sampling points of the three intelligent pressure switch transmitters 5 used for real-time monitoring of the safety oil pressure are independent of each other. The three independent analog signals and switch signals output by the three intelligent pressure switch transmitters 5 are sent to the control system for "three out of two" logical judgment, in which the analog signal is used for real-time monitoring of the safety oil pressure; the switch signal is a "single-point normally closed contact" for emergency shutdown of the ETS system. The analog signal output by the intelligent pressure switch transmitter 5 for real-time monitoring of the intermediate oil pressure is used for real-time monitoring of the intermediate oil pressure, and the switch signal output is a "window mode, normally open contact" for online judgment of the valve position change of the electromagnetic reversing valve 10 with a long-term energized function.

[0033] The device described in this embodiment has the function of online replacement of the electromagnetic reversing valve 10. The specific operation method is to manually control the valve cores of the four unloading valves 11 to close, and then manually close the four threaded plug-in stop valves 9 to cut off the pressure oil entering the unloading valve 11 through the four electromagnetic reversing valves 10, thereby completely isolating the electromagnetic reversing valve 10 hydraulically, and the electromagnetic reversing valve 10 can be inspected and replaced.

[0034] The device described in this embodiment satisfies the specific online activity test function of the electromagnetic reversing valve 10 and the unloading valve 11. When any electromagnetic reversing valve 10 in the current pair of shut-off valve groups loses power, the pilot chamber pressure of the unloading valve 11 connected in series with the electromagnetic reversing valve 10 is released, and the valve core of the unloading valve 11 is quickly opened under the action of the safety oil pressure. At this time, the intermediate oil pressure quickly rises to the same value as the safety oil pressure.

[0035] When any solenoid reversing valve 10 in the latter pair of shut-off valve groups loses power, the pilot chamber pressure of the unloading valve 11 connected in series with the solenoid reversing valve 10 is released, and the valve core of the unloading valve 11 opens rapidly under the action of the intermediate oil pressure. At this time, the intermediate oil pressure drops rapidly to the same value as the return oil pressure.

[0036] The oil pressure value displayed by the intelligent pressure switch transmitter 5 that monitors the intermediate oil pressure and the output switch quantity can be used to determine whether the online test of the four solenoid reversing valves 10 and the four unloading valves 11 is successful or not. The signal changes of the monitoring valve core position switches on the four solenoid reversing valves 10 and the four unloading valves 11 can be used to make an online intelligent diagnosis of which component is faulty.

[0037] The normally open electromagnetic stop valve 8 in the device described in this embodiment is arranged in front of the hydraulic damper forming the safety oil. After the control system receives the brake command, the four electromagnetic reversing valves 10 are simultaneously de-energized while the normally open electromagnetic stop valve 8 is also energized to quickly cut off the pressure oil entering the safety oil channel 1. The disappearance speed of the safety oil pressure of the entire steam turbine regulating system is actively accelerated from the source; the problems of excessive control oil temperature and excessive energy consumption when starting the control oil pump when the unit is not locked are completely eliminated, and finally the rapidity and safety of the system brake response are greatly improved.

[0038] Example 2

[0039] This embodiment provides a steam turbine high-pressure tripping device with online monitoring and maintenance functions, such as Figure 1 , 2 As shown, it includes a safety oil passage 1, a pressure oil passage 2, a return oil passage 3, an intermediate oil passage 4, an intelligent pressure switch transmitter 5, a safety oil hydraulic damper 6, an online verification hydraulic damper 7, a normally open electromagnetic stop valve 8 and four shut-off valve groups. Among them, the pressure oil passage 2 is connected to the safety oil passage 1 through the normally open electromagnetic stop valve 8 and the safety oil hydraulic damper 6 in sequence, and the safety oil passage 1 is connected to the return oil passage 3 through the intermediate oil passage 4; the shut-off valve group includes a threaded plug-in shut-off valve 9, an electromagnetic reversing valve 10 with a long-term energized function and an unloading valve 11 with valve position monitoring and control functions, which are connected in series in sequence. The threaded plug-in shut-off valves 9 are all connected to the pressure oil passage 2, and the electromagnetic reversing valves 10 are all connected to the return oil passage 3. The four shut-off valve groups are connected in parallel in pairs and then connected in series to the intermediate oil passage 4 through the unloading valve 11. It should be noted that, in order to ensure the simplicity and beauty of the structure of the device, and to facilitate the needs of online operation and maintenance by personnel to the greatest extent, the present embodiment preferably has four shut-off valve groups respectively arranged in mirror symmetry on the hydraulic integrated block 12. Furthermore, the online verification hydraulic dampers 7 are respectively arranged at the rear ends of the two pairs of shut-off valve groups; the intelligent pressure switch transmitters 5 are respectively arranged on the safety oil passage 1 and the intermediate oil passage 4 between the two pairs of shut-off valve groups, and are used to monitor the safety oil pressure on the safety oil passage 1 and the intermediate oil pressure on the intermediate oil passage 4 in real time. When any solenoid reversing valve 10 in the front pair of shut-off valve groups loses power, the pilot chamber pressure of the unloading valve 11 connected in series with the solenoid reversing valve 10 is released, and the valve core of the unloading valve 11 opens under the action of the safety oil pressure. At this time, the intermediate oil pressure rises to the same value as the safety oil pressure; when any solenoid reversing valve 10 in the rear pair of shut-off valve groups loses power, the pilot chamber pressure of the unloading valve 11 connected in series with the solenoid reversing valve 10 is released, and the valve core of the unloading valve 11 opens under the action of the intermediate oil pressure. At this time, the intermediate oil pressure drops to the same value as the return oil pressure.

[0040] Example 3

[0041] This embodiment provides a steam turbine high-pressure shutoff device with online monitoring and maintenance functions. Based on Embodiment 1, this embodiment further defines the structure of the threaded plug-in stop valve 9, such as Figure 3 As shown, the threaded plug-in stop valve 9 includes a valve seat 14, a valve housing 15, an adjusting screw type stop valve core 16, a locking nut 17 and a sealing member 18. The structure, position and connection relationship of each component are as follows:

[0042] The outer diameter of the valve housing 15 is connected to the preset inner hole on the hydraulic integrated block 12 through a thread, and the valve seat 14 is evenly provided with oil holes 19 that are respectively connected to the internal oil channel 13 and the inner cavity of the valve seat 14. The valve seat 14 is installed in the preset inner hole on the hydraulic integrated block 12 through the valve housing 15. The valve seat 14 and the valve housing 15, the valve seat 14 and the hydraulic integrated block 12, and the valve housing 15 and the hydraulic integrated block 12 are all sealed by a seal 18, and preferably, the valve seat 14 and the valve housing 15 form a floating sealing connection structure through the seal 18. It should be noted that designing the valve housing 15 and the valve seat 14 as a floating sealing connection structure can minimize the interference caused by excessive installation torque and hole processing errors. Several evenly distributed oil holes 19 are designed on the entire cylindrical surface of the valve seat 14 to minimize the influence of viscosity on flow changes.

[0043] The adjusting screw-type stop valve core 16 includes a rod body, a valve core end and an adjusting end, and the valve core end and the adjusting end are respectively located at both ends of the rod body, that is, the rod body, the valve core end and the adjusting end are an integrated structure. The adjusting end is designed with a hexagonal hole and 5 turns of adjusting threads, which is located outside the valve housing 15 and fixedly connected to a locking nut 17. The valve core end passes through the valve housing 15 and is threadedly connected to the valve seat 14. The rod body and the valve seat 14 are sealed by a seal 18. The position of the valve core end in the valve seat 14 can be controlled by turning the knob to adjust the end, thereby controlling the flow and on-off of the threaded plug-in stop valve 9.

[0044] It should be noted that the seal 18 includes a sealing ring and at least one anti-extrusion ring, and the sealing ring cooperates with the anti-extrusion ring to seal. Preferably, in order to achieve a better sealing effect, the sealing 18 between the valve housing 15 and the hydraulic integrated block 12, the sealing 18 between the rod body and the valve seat 14, and the sealing 18 between the valve seat 14 and the valve housing 15 all adopt a sealing structure in which an anti-extrusion ring cooperates with a sealing ring, while the sealing 18 between the valve seat 14 and the hydraulic integrated block 12 adopts a sealing structure in which two anti-extrusion rings clamp a sealing ring. The anti-extrusion ring is made of a filling material whose main body is polytetrafluoroethylene, and the sealing ring is made of a corrosion-resistant fluororubber material. The anti-extrusion ring can close the matching gap of the metal parts after being deformed by pressure, thereby preventing the sealing ring from being squeezed into the gap by the liquid pressure, and when a combined seal 18 with double anti-extrusion rings clamping the sealing ring is adopted, anti-extrusion rings are installed on both sides of the sealing ring, which ensures reliable sealing when the liquid flows in the internal oil channel 13 of the threaded plug-in stop valve 9 in both directions.

[0045] This embodiment can realize the infinite adjustment of the threaded plug-in stop valve 9 between full closure and the maximum throttle diameter, and can be used as a flow control valve or a stop valve. The adjusting screw type stop valve core 16 has a valve core structure with front and rear pressure balance in structure, which can ensure that it can be easily adjusted even in a high-pressure fluid environment. First, loosen the locking nut 17 before rotating the adjusting screw type stop valve core 16. After the adjusting screw type stop valve core 16 is rotated into place, the locking nut 17 must also be tightened in time.

[0046] Example 4

[0047] This embodiment provides a steam turbine high pressure shutoff device with online monitoring and maintenance functions. Based on any one of the embodiments 1-3, this embodiment further defines the structure of the unloading valve 11, such as Figure 4 As shown, the unloading valve 11 includes a manual valve position control screw 20, a limit nut 21, a travel switch 22, a spring 23, a valve body 24, a solenoid valve mounting block 25, a transfer block 26 and an unloading valve core 27. The structure, position and connection relationship of each component are as follows:

[0048] The solenoid valve mounting block 25 and the adapter block 26 are sealed and fixedly connected by screws and seals 18, and the corresponding oil passages are processed inside the solenoid valve mounting block 25 and the adapter block 26 according to the designed hydraulic principle diagram, and an interface for installing the solenoid reversing valve 10 is designed on the side of the solenoid valve mounting block 25, so that the solenoid reversing valve 10 can be installed on the solenoid valve mounting block 25 through the side, thereby realizing the fixed connection between the solenoid reversing valve 10 and the unloading valve 11. The side of the adapter block 26 is designed with an interface for installing the travel switch 22. At the same time, in order to prevent the travel switch 22 from being contaminated and damaged by oil during maintenance, a protective cover 28 is specially designed on the side of the adapter block 26 to protect the travel switch 22. The valve body 24 is fixedly installed in the inner hole of the hydraulic integrated block 12 through the adapter block 26, and the outer diameter of the valve body 24 and the matching surface of the inner hole of the hydraulic integrated block 12 are reliably sealed by the sealing component. The unloading valve core 27 is arranged in the valve body 24, and the unloading valve core 27 is provided with a mounting groove. The valve body 24 and the unloading valve core 27 are sealed by the conical surface at the bottom, and the area difference between the pilot chamber and the working chamber of the unloading valve core 27 is used to control the operation of the entire unloading valve 11.

[0049] One end of the manual valve position control screw 20 is fixedly connected to the limit nut 21, and the other end passes through the solenoid valve mounting block 25 and the adapter block 26 in sequence and then extends into the mounting groove of the unloading valve core 27. The manual valve position control screw 20 and the solenoid valve mounting block 25 are threadedly connected, and the matching surface between the outer diameter of the manual valve position control screw 20 and the inner diameter of the solenoid valve mounting block 25 is sealed by a sealing component. The spring 23 is sleeved on the manual valve position control screw 20 and is located between the mounting groove and the adapter block 26. In actual application, the limit stroke of the unloading valve core 27 can be manually controlled by screwing the manual valve position control screw 20 in and out. Before operation, the limit nut 21 must be loosened first before the manual valve position control screw 20 can be rotated. After the manual valve position control screw 20 is rotated into place, the limit nut 21 must also be tightened in time.

[0050] The unloading valve 11 of this embodiment has both manual and hydraulic valve position control functions. In addition to the conventional unloading valve 11 functions, the valve position can also be controlled by rotating the manual valve position control screw 20. When the unloading valve 11 needs to be manually closed, the manual valve position control screw 20 needs to be screwed in to the bottom. If the manual control needs to be completely exited, the manual valve position control screw 20 needs to be screwed out to the top. The two states of screwing in the manual valve position control screw 20 to the bottom or screwing out the manual valve position control screw 20 to the top are remotely monitored by the travel switch 22 installed on the side of the adapter block 26.

[0051] The above description is only a specific implementation mode of the present invention. Any feature disclosed in this specification, unless otherwise stated, can be replaced by other alternative features that are equivalent or have similar purposes; all the disclosed features, or all the steps in the methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

Claims

1. A steam turbine high-pressure tripping device with online monitoring and maintenance functions, characterized in that: The invention comprises a safety oil passage (1), a pressure oil passage (2), an oil return passage (3), an intermediate oil passage (4), an intelligent pressure switch transmitter (5), a safety oil hydraulic damper (6), an online verification hydraulic damper (7), a normally open electromagnetic stop valve (8) and four shut-off valve groups, wherein the pressure oil passage (2) is connected to the safety oil passage (1) through the normally open electromagnetic stop valve (8) and the safety oil hydraulic damper (6) in sequence, and the safety oil passage (1) is connected to the oil return passage (3) through the intermediate oil passage (4); the shut-off valve group comprises a threaded plug-in stop valve (9), an electromagnetic reversing valve with a long-term energization function (10) which are connected in series in sequence. ) and a relief valve (11) with valve position monitoring and control functions, the threaded plug-in stop valve (9) is communicated with the pressure oil channel (2), the electromagnetic reversing valve (10) is communicated with the return oil channel (3), the four isolation valve groups are connected in pairs in parallel and then connected in series to the intermediate oil channel (4) through the relief valve (11); the online verification hydraulic damper (7) is respectively arranged at the rear end of the two pairs of isolation valve groups; the intelligent pressure switch transmitter (5) is respectively arranged on the safety oil channel (1) and the intermediate oil channel (4) between the two pairs of isolation valve groups, and is used for real-time monitoring of the safety oil pressure on the safety oil channel (1) and the intermediate oil pressure on the intermediate oil channel (4); When any electromagnetic reversing valve (10) in the first pair of shutoff valve groups loses power, the pilot chamber pressure of the unloading valve (11) connected in series with the electromagnetic reversing valve (10) is released, and the valve core of the unloading valve (11) is opened under the action of the safety oil pressure. At this time, the intermediate oil pressure rises to the same value as the safety oil pressure; When any solenoid reversing valve (10) in the latter pair of shutoff valve groups loses power, the pilot chamber pressure of the unloading valve (11) connected in series with the solenoid reversing valve (10) is released, and the valve core of the unloading valve (11) opens under the action of the intermediate oil pressure. At this time, the intermediate oil pressure drops to the same value as the return oil pressure. The number of the intelligent pressure switch transmitters (5) is four, one of which is connected between the preceding online verification hydraulic damper (7) and the following pair of shutoff valve groups, and the remaining intelligent pressure switch transmitters (5) are separately connected to the safety oil passage (1); It also includes a hydraulic integrated block (12) having an internal oil passage (13), wherein the threaded plug-in stop valve (9), the electromagnetic reversing valve (10) and the unloading valve (11) are all in communication with the internal oil passage (13) of the hydraulic integrated block (12); The threaded plug-in stop valve (9) comprises a valve seat (14), a valve housing (15), an adjusting screw stop valve core (16), a locking nut (17) and a sealing member (18); a floating sealing connection structure is formed between the valve seat (14) and the valve housing (15) via the sealing member (18); the valve seat (14) is installed in a hydraulic integrated block (12) via the valve housing (15); the valve seat (14) is evenly provided with oil holes (19) which are respectively communicated with the internal oil passage (13) and the inner cavity of the valve seat (14); The valve seat (14) and the hydraulic integrated block (12) and the valve housing (15) and the hydraulic integrated block (12) are sealed by means of a sealing member (18); the regulating screw type stop valve core (16) comprises a rod body, a valve core end and an adjusting end, the valve core end and the adjusting end are respectively located at two ends of the rod body, the adjusting end is located outside the valve housing (15) and is fixedly connected to a locking nut (17), the valve core end passes through the valve housing (15) and is arranged in the valve seat (14), and the rod body and the valve seat (14) are sealed by means of a sealing member (18).

2. A steam turbine high-pressure tripping device with online monitoring and maintenance functions according to claim 1, characterized in that: The shut-off valve groups are respectively arranged on hydraulic integrated blocks (12) which are mirror-symmetrically arranged.

3. The steam turbine high-pressure tripping device with online monitoring and maintenance functions according to claim 1 is characterized in that: The sealing element (18) comprises a sealing ring and at least one anti-extrusion ring, and the sealing ring cooperates with the anti-extrusion ring to seal.

4. A steam turbine high-pressure tripping device with online monitoring and maintenance functions according to any one of claims 1 to 3, characterized in that: The unloading valve (11) comprises a manual valve position control screw (20), a limit nut (21), a travel switch (22), a spring (23), a valve body (24), a solenoid valve mounting block (25), a transfer block (26) and an unloading valve core (27). The solenoid valve mounting block (25) is sealed and fixedly connected to the solenoid reversing valve (10) and the transfer block (26), respectively. The valve body (24) is fixed in the hydraulic integrated block (12) through the transfer block (26). The unloading valve core (27) is arranged in the valve body. A mounting groove is provided on the unloading valve core (27) in the body (24); one end of the manual valve position control screw (20) is fixedly connected to the limit nut (21); the other end of the manual valve position control screw (20) passes through the solenoid valve mounting block (25) and the adapter block (26) in sequence and then extends into the mounting groove; the spring (23) is sleeved on the manual valve position control screw (20) and is located between the mounting groove and the adapter block (26); and the travel switch (22) is fixed on the adapter block (26) for detecting the travel of the manual valve position control screw (20).

5. The steam turbine high-pressure tripping device with online monitoring and maintenance functions according to claim 4 is characterized in that: A protective cover (28) is fixed on the transfer block (26), and the travel switch (22) is located inside the protective cover (28).

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