Turbine two-out-of-three shutdown structure for online detection

Abstract

The utility model relates to a steam turbine two-out-of-three shutdown structure for on-line detection, which belongs to the technical field of steam turbines and comprises a quick-closing valve, one end of the quick-closing valve is provided with an oil inlet pipe communicated with the quick-closing valve, and the other end of the quick-closing valve is provided with an oil return pipe communicated with the quick-closing valve. An unloading valve I communicated with the quick-closing valve through a pipeline is arranged between the oil inlet pipe and the oil return pipe, and a hydraulic control assembly communicated with the unloading valve I through a pipeline is arranged between the oil inlet pipe and the oil return pipe. The hydraulic control assembly comprises an electromagnetic valve I which is communicated with the oil inlet pipe and the oil return pipe through pipelines. The device has the characteristics of simple structure, good operation reliability and high operation safety. The problem that a steam turbine is shut down due to misoperation and electromagnetic valve faults is solved. Reliability and safety of steam turbine operation are ensured, and economic benefits are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a three-out-of-two shutdown structure of a steam turbine for online detection. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam-powered device. High-temperature, high-pressure steam passes through a fixed nozzle, accelerating into an airflow and then spraying onto blades. This causes the rotor, equipped with rows of blades, to rotate, simultaneously producing work. Steam turbines are a staple of modern thermal power plants and are also used in the metallurgical and chemical industries, as well as in ship propulsion systems.

[0003] The Chinese patent "A Redundant Remote Control Shutdown Control Circuit for Quick-Closing Valve of a Steam Turbine Main Steam Circuit", application number CN201520120303.7, discloses a branch hydraulic circuit including three remote controls and redundant configurations of identical components. The branch hydraulic circuit consists of a solenoid reversing valve and a hydraulic reversing valve. The first oil drain port of the solenoid reversing valve is connected to the hydraulic reversing valve, and the second oil drain port of the solenoid reversing valve is respectively connected to the return oil pipeline. The oil drain ports of the hydraulic reversing valve are respectively connected to the two-way cartridge valves. The first oil drain port of the two-way cartridge valve is connected to the return oil pipeline, and the second oil drain port of the two-way cartridge valve is connected to the quick-closing valve control oil circuit.

[0004] Compared with the existing technology, the structure is simplified while ensuring operational stability, and by reducing the number of hydraulic reversing valves, the failure points and corresponding oil leakage points are reduced. Summary of the Invention

[0005] This utility model primarily addresses the shortcomings of the prior art by providing a steam turbine two-out-of-three shutdown mechanism for online testing. The mechanism features a simple structure, high operational reliability, and enhanced operational safety. It solves the problem of turbine shutdowns caused by malfunctions and solenoid valve failures, ensuring reliable and safe operation of the turbine and improving economic efficiency.

[0006] The above technical problems of the present invention are mainly solved by the following technical solutions:

[0007] A three-out-of-two shutdown structure for a steam turbine for online detection includes a quick-closing valve, one end of the quick-closing valve is provided with an oil inlet pipe connected to the quick-closing valve, the other end of the quick-closing valve is provided with an oil return pipe connected to the quick-closing valve, an unloading valve I is provided between the oil inlet pipe and the oil return pipe and is connected to the quick-closing valve via a pipeline, and a hydraulic control component is provided between the oil inlet pipe and the oil return pipe and is connected to the unloading valve I via a pipeline; the hydraulic control component includes a solenoid valve I connected to the oil inlet pipe and the oil return pipe.

[0008] Preferably, a side of the unloading valve I is provided with an unloading valve II which is in parallel with the unloading valve I and is connected to the hydraulic control component, the oil inlet pipe, the oil return pipe and the quick-closing valve through pipelines.

[0009] Preferably, the hydraulic control component further includes a solenoid valve II and a solenoid valve III, wherein the solenoid valve II is connected to the solenoid valve I, the solenoid valve III and the unloading valve I through a pipeline, and the solenoid valve III is connected to the solenoid valve I, the solenoid valve II and the unloading valve I through a pipeline.

[0010] Preferably, each of the solenoid valves I, II, and III is provided with a travel switch, which enables online detection of the operating status of the solenoid valves I, II, and III.

[0011] The utility model can achieve the following effects:

[0012] This utility model provides a three-out-of-two shutdown mechanism for steam turbines used for online testing. Compared with existing technologies, it features a simple structure, good operational reliability, and enhanced operational safety. It solves the problem of steam turbine shutdowns caused by malfunctions and solenoid valve failures, ensuring reliable and safe operation of the steam turbine and improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the normal operating state of the utility model.

[0014] Figure 2 It is a schematic diagram of the shutdown state of the utility model.

[0015] Figure 3 It is a schematic diagram of the fault state of the solenoid valve I of the present invention.

[0016] Figure 4 It is a schematic diagram of the fault state of the solenoid valve II of the present utility model.

[0017] Figure 5 It is a schematic diagram of the fault state of the solenoid valve III of the present utility model.

[0018] In the figure: oil inlet pipe 1, solenoid valve I 2, solenoid valve II 3, solenoid valve III 4, travel switch 5, unloading valve II 6, oil return pipe 7, unloading valve I 8, quick-closing valve 9. DETAILED DESCRIPTION

[0019] The technical solution of the present invention will be further specifically described below with reference to embodiments and in conjunction with the accompanying drawings.

[0020] Example: Figure 1-5As shown, a three-out-of-two steam turbine shutdown structure for online testing includes a quick-closing valve 9. An oil inlet pipe 1 is provided at one end of the quick-closing valve 9, and an oil return pipe 7 is provided at the other end of the quick-closing valve 9. An unloading valve I8 is provided between the oil inlet pipe 1 and the oil return pipe 7, and is connected to the quick-closing valve 9. A hydraulic control assembly is provided between the oil inlet pipe 1 and the oil return pipe 7, and is connected to the unloading valve I8. An unloading valve II6 is provided on the side of the unloading valve I8, and is connected in parallel with the unloading valve I8 and is connected to the hydraulic control assembly, the oil inlet pipe 1, the oil return pipe 7, and the quick-closing valve 9. The hydraulic control assembly includes a solenoid valve I2, which is connected to the oil inlet pipe 1 and the oil return pipe 7. The hydraulic control assembly also includes solenoid valve II3 and solenoid valve III4. Solenoid valve II3 is connected to solenoid valve I2, solenoid valve III4, and unloading valve I by 8-phase piping. Solenoid valve III4 is connected to solenoid valve I2, solenoid valve II3, and unloading valve I by 8-phase piping. Solenoid valve I2, solenoid valve II3, and solenoid valve III4 are all equipped with travel switches 5.

[0021] When any two or three of solenoid valves I2, II3 and III4 receive the shutdown signal and act, the pressure oil in unloading valve I8 and unloading valve II6 can be quickly unloaded, so that the A / B ports in unloading valve I8 and unloading valve II6 are connected, and the quick-closing valve 9 is closed to realize the shutdown of the turbine.

[0022] When any one of the solenoid valves Ⅰ2, Ⅱ3 and Ⅲ4 stops working, the pressure oil in the unloading valve Ⅰ8 and Ⅱ6 will not be unloaded, the pressure will remain constant, the quick-closing valve 9 will open normally and the turbine will not stop working.

[0023] In summary, this steam turbine two-out-of-three shutdown mechanism for online testing features a simple structure, high operational reliability, and strong safety. It solves the problem of turbine shutdown caused by malfunction and solenoid valve failure, ensuring reliable and safe operation of the turbine and improving economic benefits.

[0024] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0025] In summary, the above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the scope of the present invention are included in the patent scope of the present invention.

Claims

1. A steam turbine two-out-of-three shutdown structure for online testing, characterized by: It comprises a quick-closing valve (9), one end of the quick-closing valve (9) is provided with an oil inlet pipe (1) connected to the quick-closing valve (9), the other end of the quick-closing valve (9) is provided with an oil return pipe (7) connected to the quick-closing valve (9), an unloading valve I (8) connected to the quick-closing valve (9) is provided between the oil inlet pipe (1) and the oil return pipe (7), and a hydraulic control component connected to the unloading valve I (8) is provided between the oil inlet pipe (1) and the oil return pipe (7); the hydraulic control component comprises a solenoid valve I (2) connected to the oil inlet pipe (1) and the oil return pipe (7).

2. The steam turbine two-out-of-three shutdown structure for online detection according to claim 1, characterized in that: The unloading valve I (8) is provided on the side thereof with an unloading valve II (6) which is in parallel with the unloading valve I (8) and is connected to the hydraulic control component, the oil inlet pipe (1), the oil return pipe (7), and the quick-closing valve (9).

3. The steam turbine two-out-of-three shutdown structure for online detection according to claim 1, characterized in that: The hydraulic control assembly further comprises a solenoid valve II (3) and a solenoid valve III (4). The solenoid valve II (3) is connected to the solenoid valve I (2), the solenoid valve III (4), and the unloading valve I (8) through a pipeline. The solenoid valve III (4) is connected to the solenoid valve I (2), the solenoid valve II (3), and the unloading valve I (8) through a pipeline.

4. The steam turbine two-out-of-three shutdown structure for online detection according to claim 3 is characterized in that: The solenoid valve I (2), the solenoid valve II (3), and the solenoid valve III (4) are all provided with a travel switch (5).

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