Pressure relief device mounted behind water control electromagnetic valve of steam turbine

Abstract

The utility model discloses a pressure relief device installed behind a water control electromagnetic valve of a steam turbine, which relates to the technical field of steam extraction systems of steam turbines of thermal power plants, and comprises a unit steam extraction check valve, and a first water supply pipeline and a second water supply pipeline are installed on one side of the unit steam extraction check valve. The first water supply pipeline and the second water supply pipeline are connected with the unit steam extraction check valve into a whole, the first water supply pipeline and the second water supply pipeline are arranged in parallel, the first water supply pipeline and the second water supply pipeline are each provided with a water control electromagnetic valve and a pressure relief structure, and the pressure relief structures are arranged behind the water control electromagnetic valves. According to the pressure relief device, when an operator executes a water control electromagnetic valve test, after the electromagnetic valve acts, the pressure relief device does not need to conduct pressure relief on a rear stop valve of the water control electromagnetic valve, the pressure relief device can be directly opened for pressure relief, the situation that when the rear stop valve is opened for pressure relief, the water control check valve is closed is prevented, and safe operation of system equipment is ensured.

Description

Technical Field

[0001] This utility model relates to the technical field of steam extraction systems for steam turbines in thermal power plants, specifically a pressure relief device installed after the water-controlled solenoid valve of a steam turbine. Background Technology

[0002] The steam turbine is equipped with primary and secondary pumping water control check valves. In abnormal situations, the water-controlled solenoid valves can quickly open, controlling the water flow to close the pumping steam check valves. The high-pressure heater water control solenoid valve is a key control component in the high-pressure heater (HPU) system, mainly used to control the on / off state and flow regulation of high-pressure feedwater, ensuring the safe and stable operation of the HPU system.

[0003] When operators perform tests on water-controlled solenoid valves, after the solenoid valve activates, the rear shut-off valve of the water-controlled solenoid valve needs to be opened to release pressure. When the rear shut-off valve is opened to release pressure, the pressure water flow can easily cause the water-controlled check valve to close, resulting in interruption of steam supply to the high-pressure heater and disconnection of the high-pressure heater, which cannot meet the usage requirements. Utility Model Content

[0004] The purpose of this utility model is to solve the problem mentioned in the background art that when operators perform water-controlled solenoid valve tests, after the solenoid valve is activated, the water-controlled solenoid valve needs to be opened to release pressure. When the pressure is released by opening the rear gate valve, the pressure water flow can easily cause the water-controlled check valve to close, resulting in the interruption of steam intake to the high-pressure heater and the disconnection of the high-pressure heater, which cannot meet the usage requirements.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pressure relief device installed after a water-controlled solenoid valve of a steam turbine, comprising a turbine extraction steam non-return valve, wherein a first water supply pipeline and a second water supply pipeline are installed on one side of the turbine extraction steam non-return valve, and the first water supply pipeline and the second water supply pipeline are integrated with the turbine extraction steam non-return valve; the first water supply pipeline and the second water supply pipeline are arranged in parallel; each of the first water supply pipeline and the second water supply pipeline is equipped with a water-controlled solenoid valve and a pressure relief structure, and the pressure relief structure is located behind the water-controlled solenoid valve, and the pressure relief structure is arranged in series with the water-controlled solenoid valve.

[0006] Preferably, the pressure relief structure includes a pressure relief seat, a cover plate, a piston, a connecting plate, a screw, a handwheel, and a compression spring. The cover plate is disposed above the pressure relief seat and is connected to the pressure relief seat by screws. The pressure relief seat has an internal cavity. The piston is disposed inside the cavity and is slidably connected to the pressure relief seat. A pressure relief hole is disposed on one side of the pressure relief seat and communicates with the cavity. The pressure relief hole is disposed on one side of the piston. The connecting plate is disposed inside the cover plate and is slidably connected to the cover plate. The compression spring is disposed between the connecting plate and the piston, and its two ends are fixedly connected to the piston and the connecting plate, respectively. The screw is disposed above the cover plate and is threadedly connected to the cover plate. The lower end of the screw is rotatably connected to the connecting plate. The handwheel is disposed above the screw and is connected to the screw by screws.

[0007] Preferably, a sealing ring is provided on the outside of the piston component, and the sealing ring is integrally connected with the piston component. The sealing ring is in contact with the inner wall of the cavity. A limiting block is provided inside the cavity, and the limiting block is fixedly connected to the pressure relief seat. The pressure relief seat is located below the piston component.

[0008] Preferably, the inner wall of the cover plate is provided with a sliding groove, there are two sliding grooves, and the two sliding grooves are located on both sides of the connecting plate. A slider is provided inside each of the two sliding grooves, and the slider is slidably connected to the cover plate. The slider is fixedly connected to the connecting plate. A ball is provided at one end of the slider. The ball contacts the inner wall of the sliding groove, and the ball is rotatably connected to the cover plate and the slider.

[0009] Preferably, a water storage tank is provided on one side of the pressure relief structure, and a connecting pipe is provided between the water storage tank and the pressure relief structure. One end of the connecting pipe is connected to the water storage tank, and the other end of the connecting pipe is correspondingly provided to the pressure relief hole. The connecting pipe is threadedly connected to the pressure relief seat.

[0010] Preferably, a pressure detection component is provided on both the first water supply pipeline and the second water supply pipeline, and the pressure detection component is integrated with the first water supply pipeline and the second water supply pipeline. The pressure detection component is located behind the pressure relief structure.

[0011] Preferably, an alarm light is provided above the water-controlled solenoid valve, and the alarm light is connected to the water-controlled solenoid valve by screws.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model device, through the setting of a pressure relief structure and a pressure detection component, allows the pressure in the pipeline to exert an upward thrust on the piston, while the compression spring exerts a downward thrust on the piston. When the upward thrust exceeds the downward thrust, the piston is lifted up. As the piston is lifted to a certain height, the pressure relief hole is exposed, and water is discharged from the pressure relief hole to relieve pressure. When the upward thrust is less than the downward thrust, the piston falls down and re-blocks the pressure relief hole. After the solenoid valve is activated, there is no need to open the water control solenoid valve back valve for pressure relief. The pressure relief device can perform pressure relief autonomously, preventing the water control check valve from closing when the back valve is opened for pressure relief, thus ensuring the safe operation of the system equipment. The pressure detection component measures the water pressure in the first and second water supply pipelines, and the pressure relief structure can be easily adjusted according to the water pressure, improving the practicality of the pressure relief device.

[0014] 2. This utility model device uses a screw and a handwheel. The handwheel drives the screw to rotate, and as the screw rotates, it causes the connecting plate to rise and fall. When the height of the connecting plate changes, the pressure applied by the compression spring to the piston also changes. When the connecting plate falls, the pressure applied to the piston increases, and a greater water pressure is required to lift the piston. When the connecting plate rises, the pressure applied to the piston decreases, and the water pressure required to lift the piston decreases, thus satisfying the pressure relief needs of different pressure requirements. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a cross-sectional view of the pressure relief structure of this utility model;

[0017] Figure 3 For the present utility model Figure 2 A magnified view of a portion of area A.

[0018] In the diagram: 1. Unit extraction steam non-return valve; 2. First water supply pipeline; 3. Second water supply pipeline; 4. Water-controlled solenoid valve; 5. Pressure relief structure; 6. Pressure detection assembly; 7. Water storage tank; 8. Connecting pipe; 9. Pressure relief seat; 10. Cavity; 11. Cover plate; 12. Pressure relief hole; 13. Piston; 14. Sealing ring; 15. Connecting plate; 16. Screw; 17. Handwheel; 18. Compression spring; 19. Limit block; 20. Slide groove; 21. Slider; 22. Ball bearing; 23. Alarm light. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Reference Figure 1-3As shown in the figure, an embodiment of the present invention provides a pressure relief device installed after a water-controlled solenoid valve of a steam turbine, including a turbine extraction steam non-return valve 1. A first water supply pipeline 2 and a second water supply pipeline 3 are installed on one side of the turbine extraction steam non-return valve 1, and the first water supply pipeline 2 and the second water supply pipeline 3 are connected to the turbine extraction steam non-return valve 1 as a whole. The first water supply pipeline 2 and the second water supply pipeline 3 are arranged in parallel. A water-controlled solenoid valve 4 and a pressure relief structure 5 are installed on both the first water supply pipeline 2 and the second water supply pipeline 3. The pressure relief structure 5 is located behind the water-controlled solenoid valve 4 and is arranged in series with the water-controlled solenoid valve 4. The pressure relief structure 5 includes a pressure relief seat 9, a cover plate 11, a piston 13, a connecting plate 15, and a screw. The pressure relief seat 9 is equipped with a lever 16, a handwheel 17, and a compression spring 18. A cover plate 11 is positioned above the pressure relief seat 9 and is connected to the pressure relief seat 9 by screws. The pressure relief seat 9 has a cavity 10 inside, and a piston 13 is positioned inside the cavity 10 and is slidably connected to the pressure relief seat 9. A pressure relief hole 12 is provided on one side of the pressure relief seat 9 and is connected to the cavity 10. The pressure relief hole 12 is positioned on one side of the piston 13. A connecting plate 15 is positioned inside the cover plate 11 and is slidably connected to the cover plate 11. A compression spring 18 is positioned between the connecting plate 15 and the piston 13, and both ends of the compression spring 18 are fixedly connected to the piston 13 and the connecting plate 15, respectively.

[0021] In use: When the unit malfunctions, the water-controlled solenoid valve 4 opens quickly, controlling the water to close the steam extraction check valve. When the pressure in the water supply line increases, the pressure applies an upward thrust to the piston 13, and the compression spring 18 applies a downward thrust to the piston 13. When the upward thrust exceeds the downward thrust, the piston 13 is lifted. As the piston 13 is lifted to a certain height, the pressure relief hole 12 is exposed, and water is discharged from the pressure relief hole 12 to relieve pressure. When the upward thrust is less than the downward thrust, the piston 13 falls down and re-blocks the pressure relief hole 12. It is not necessary to open the water-controlled solenoid valve 4 to relieve pressure, thus improving the operational stability of the system equipment.

[0022] Reference Figure 2 and Figure 3As shown, screw 16 is positioned above cover plate 11 and is threadedly connected to cover plate 11. The lower end of screw 16 is rotatably connected to connecting plate 15. Handwheel 17 is positioned above screw 16 and is connected to screw 16 by screws. A sealing ring 14 is provided on the outside of piston 13 and is integrally connected to piston 13. The sealing ring 14 fits against the inner wall of cavity 10. A limiting block 19 is provided inside cavity 10 and is fixedly connected to pressure relief seat 9. Pressure relief seat 9 is positioned below piston 13. A sliding groove 20 is provided on the inner wall of cover plate 11. There are two sliding grooves 20, and the two sliding grooves 20 are located on both sides of connecting plate 15. A slider 21 is provided inside each of the two sliding grooves 20, and the slider 21 is connected to cover plate 11. 1. Sliding connection: The slider 21 is fixedly connected to the connecting plate 15. One end of the slider 21 is provided with a ball bearing 22. The ball bearing 22 contacts the inner wall of the groove 20 and is in rolling connection with the cover plate 11 and the slider 21. The sealing ring 14 ensures the sealing of the connection between the piston 13 and the pressure relief seat 9. The screw 16 is rotated by the handwheel 17. As the screw 16 rotates, the connecting plate 15 is raised and lowered. When the height of the connecting plate 15 changes, the pressure applied to the piston 13 by the compression spring 18 also changes. When the connecting plate 15 descends, the pressure applied to the piston 13 increases. If the piston 13 is lifted, a greater water pressure is required. When the connecting plate 15 rises, the pressure applied to the piston 13 decreases. The water pressure required to lift the piston 13 decreases. This can meet the pressure relief requirements of different pressure needs.

[0023] Reference Figure 1 and Figure 2 As shown, a water storage tank 7 is provided on one side of the pressure relief structure 5. A connecting pipe 8 is provided between the water storage tank 7 and the pressure relief structure 5. One end of the connecting pipe 8 is connected to the water storage tank 7, and the other end of the connecting pipe 8 is correspondingly provided to the pressure relief hole 12. The connecting pipe 8 is threadedly connected to the pressure relief seat 9. Water flowing out of the pressure relief hole 12 flows into the water storage tank 7 through the connecting pipe 8 for centralized collection, so that the collected water can be reused.

[0024] Reference Figure 1 As shown, pressure detection components 6 are installed on both the first water supply pipeline 2 and the second water supply pipeline 3, and the pressure detection components 6 are connected to the first water supply pipeline 2 and the second water supply pipeline 3 as a whole. The pressure detection components 6 are located behind the pressure relief structure 5. An alarm light 23 is installed above the water control solenoid valve 4, and the alarm light 23 is connected to the water control solenoid valve 4 by screws. The pressure detection components 6 measure the water pressure in the first water supply pipeline 2 and the second water supply pipeline 3, and adjust the pressure relief structure according to the water pressure. When the water pressure is in a high-pressure state for a long time and does not drop, the alarm light 23 will be triggered to sound an alarm.

[0025] Working principle: When the unit malfunctions, the water-controlled solenoid valve 4 opens quickly, controlling the water to close the steam extraction check valve. When the pressure in the water supply line increases, the pressure exerts an upward thrust on the piston 13, and the compression spring 18 exerts a downward thrust on the piston 13. When the upward thrust exceeds the downward thrust, the piston 13 is lifted. As the piston 13 is lifted to a certain height, the pressure relief hole 12 is exposed, and water is discharged from the pressure relief hole 12 to relieve pressure. The connecting pipe 8 collects the water flowing from the pressure relief hole 12 into the water storage tank 7. When the upward thrust is less than the downward thrust, the piston 13 falls back down to re-block the pressure relief hole 12, eliminating the need to open the water-controlled solenoid valve 4 for pressure relief, thus improving the stability of the system equipment operation; pressure The detection component 6 measures the water pressure in the first water supply pipe 2 and the second water supply pipe 3. The pressure relief structure can be adjusted according to the water pressure. When the water pressure is high for a long time and does not drop, the alarm light 23 will be triggered to sound an alarm. The handwheel 17 drives the screw 16 to rotate. As the screw 16 rotates, the connecting plate 15 rises and falls. When the height of the connecting plate 15 changes, the pressure applied by the compression spring 18 to the piston 13 also changes. When the connecting plate 15 falls, the pressure applied to the piston 13 increases. If the piston 13 is lifted, a greater water pressure is required. When the connecting plate 15 rises, the pressure applied to the piston 13 decreases. The water pressure required to lift the piston 13 decreases. This can meet the pressure relief needs of different pressure requirements.

[0026] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure relief device installed after the water-controlled solenoid valve of a steam turbine, comprising a unit extraction steam non-return valve (1), characterized in that: The first water supply pipeline (2) and the second water supply pipeline (3) are installed on one side of the unit extraction steam non-return valve (1). The first water supply pipeline (2) and the second water supply pipeline (3) are connected to the unit extraction steam non-return valve (1) as a whole. The first water supply pipeline (2) and the second water supply pipeline (3) are connected in parallel. A water-controlled solenoid valve (4) and a pressure relief structure (5) are installed on the first water supply pipeline (2) and the second water supply pipeline (3). The pressure relief structure (5) is located behind the water-controlled solenoid valve (4). The pressure relief structure (5) is connected in series with the water-controlled solenoid valve (4).

2. The pressure relief device installed after the water control solenoid valve of a steam turbine according to claim 1, characterized in that: The pressure relief structure (5) includes a pressure relief seat (9), a cover plate (11), a piston (13), a connecting plate (15), a screw (16), a handwheel (17), and a compression spring (18). The cover plate (11) is located above the pressure relief seat (9), and the cover plate (11) is connected to the pressure relief seat (9) by screws. The pressure relief seat (9) has a cavity (10) inside. The piston (13) is located inside the cavity (10), and the piston (13) is slidably connected to the pressure relief seat (9). A pressure relief hole (12) is provided on one side of the pressure relief seat (9), and the pressure relief hole (12) is connected to the cavity (10). The pressure relief hole (12) is located on the piston. On one side of component (13), the connecting plate (15) is disposed inside the cover plate (11), and the connecting plate (15) is slidably connected to the cover plate (11). The compression spring (18) is disposed between the connecting plate (15) and the piston component (13), and the two ends of the compression spring (18) are fixedly connected to the piston component (13) and the connecting plate (15) respectively. The screw (16) is disposed above the cover plate (11), and the screw (16) is threadedly connected to the cover plate (11). The lower end of the screw (16) is rotatably connected to the connecting plate (15). The handwheel (17) is disposed above the screw (16), and the handwheel (17) is connected to the screw (16) by a screw.

3. A pressure relief device installed after the water control solenoid valve of a steam turbine according to claim 2, characterized in that: The piston (13) is provided with a sealing ring (14) on its outside, and the sealing ring (14) is connected to the piston (13) as a whole. The sealing ring (14) is in contact with the inner wall of the cavity (10). The cavity (10) is provided with a limiting block (19), and the limiting block (19) is fixedly connected to the pressure relief seat (9). The pressure relief seat (9) is located below the piston (13).

4. A pressure relief device installed after the water control solenoid valve of a steam turbine according to claim 2, characterized in that: The inner wall of the cover plate (11) is provided with a sliding groove (20). There are two sliding grooves (20), and the two sliding grooves (20) are located on both sides of the connecting plate (15). The interior of each of the two sliding grooves (20) is provided with a slider (21), and the slider (21) is slidably connected to the cover plate (11). The slider (21) is fixedly connected to the connecting plate (15). One end of the slider (21) is provided with a ball (22). The ball (22) contacts the inner wall of the sliding groove (20), and the ball (22) is tumbledly connected to the cover plate (11) and the slider (21).

5. A pressure relief device installed after the water control solenoid valve of a steam turbine according to claim 1, characterized in that: A water storage tank (7) is provided on one side of the pressure relief structure (5). A connecting pipe (8) is provided between the water storage tank (7) and the pressure relief structure (5). One end of the connecting pipe (8) is connected to the water storage tank (7), and the other end of the connecting pipe (8) is correspondingly provided to the pressure relief hole (12). The connecting pipe (8) is threadedly connected to the pressure relief seat (9).

6. A pressure relief device installed after the water control solenoid valve of a steam turbine according to claim 1, characterized in that: Pressure detection components (6) are provided on both the first water supply pipeline (2) and the second water supply pipeline (3), and the pressure detection components (6) are connected to the first water supply pipeline (2) and the second water supply pipeline (3) as a whole. The pressure detection components (6) are located behind the pressure relief structure (5).

7. A pressure relief device installed after the water control solenoid valve of a steam turbine according to claim 1, characterized in that: An alarm light (23) is provided above the water-controlled solenoid valve (4), and the alarm light (23) is connected to the water-controlled solenoid valve (4) by screws.

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