Layered speed regulation structure of water feed pump turbine

Abstract

The utility model relates to a layered speed regulation structure of a water feed pump turbine, which belongs to the technical field of turbines and comprises a turbine, a water feed pump connected with the turbine in a rotating shaft mode at one end of the turbine, an oil supply pipe communicated with the turbine through a pipeline is arranged at the other end of the turbine, and a shutdown electromagnetic valve is arranged between the oil supply pipe and the turbine. An oil pressure regulation and control assembly is arranged between the shutdown electromagnetic valve and the steam turbine, a pressure oil pipe and a signal oil pipe are arranged between the oil pressure regulation and control assembly and the shutdown electromagnetic valve, and a feedback oil pipe is arranged between the oil pressure regulation and control assembly and the steam turbine. And the oil pressure regulation and control assembly comprises a regulation valve I. The device has the characteristics of simple structure, good operation stability and high safety and reliability. By controlling the pressure of the signal oil, the opening degree of the oil pressure regulation and control assembly is determined according to the pressure of the signal oil, and therefore closed-loop control over the rotating speed of the steam turbine is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a layered speed regulation structure of a feedwater pump steam turbine. Background Art

[0002] In large-capacity, high-parameter steam turbine power plants, steam-driven feedwater pumps are usually deployed. The steam turbine drives the feedwater pumps, increasing the pressure of the feedwater to supply the subsequent process systems.

[0003] According to the change of unit load, the output of the feedwater pump needs to change accordingly, which is usually met by the corresponding change of the feedwater pump speed, and the feedwater pump speed is determined by the speed of the coaxially connected steam turbine. Summary of the Invention

[0004] This utility model primarily addresses the shortcomings of the prior art by providing a feedwater pump turbine stratified speed regulation structure that features a simple structure, excellent operational stability, and high safety and reliability. By controlling the pressure of the signal oil, the opening of the oil pressure control assembly is determined by the pressure of the signal oil, thereby achieving closed-loop control of the turbine speed.

[0005] The above technical problems of the present invention are mainly solved by the following technical solutions:

[0006] A feedwater pump steam turbine layered speed regulation structure includes a steam turbine, a feedwater pump connected to the turbine by a rotating shaft at one end, an oil supply pipe connected to the turbine by a pipeline at the other end, a shutdown solenoid valve between the oil supply pipe and the steam turbine, an oil pressure control assembly between the shutdown solenoid valve and the steam turbine, a pressure oil pipe and a signal oil pipe between the oil pressure control assembly and the shutdown solenoid valve, and a feedback oil pipe between the oil pressure control assembly and the steam turbine. The oil pressure control assembly includes a regulating valve I.

[0007] Preferably, the oil pressure control assembly further includes control valves II and III, which are connected in parallel with control valve I. The addition of control valves II and III increases the oil pressure control capacity. Feedback oil pipes connect the oil circuits between control valve I and the steam turbine, between control valve II and the steam turbine, and between control valve III and the steam turbine.

[0008] Preferably, a pressure relief valve I is provided between the signal oil pipe and the steam turbine, an actuator is provided between the pressure relief valve I and the steam turbine, and a mechanical lever controller is provided between the actuator and the pressure relief valve I.

[0009] Preferably, an electronic speed regulator is provided between the actuator and the steam turbine and is connected to the actuator in a parallel circuit.

[0010] Preferably, a pressure relief valve II is provided between the pressure relief valve I and the shutdown solenoid valve, one end of the pressure relief valve being connected to the signal oil pipe.

[0011] Preferably, the other end of the pressure relief valve I and the other end of the pressure relief valve II are both provided with return oil pipes connected to the pressure relief valve I and the pressure relief valve II respectively.

[0012] Preferably, a coupling is provided between the steam turbine and the feed water pump.

[0013] The utility model can achieve the following effects:

[0014] This utility model provides a feedwater pump steam turbine layered speed control structure that, compared with existing technologies, features a simple structure, good operational stability, and high safety and reliability. By controlling the pressure of the signal oil, the opening of the regulating valve is determined by the pressure of the signal oil, thereby achieving closed-loop control of the steam turbine speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] Figure 2 It is a structural diagram of the oil pressure control component in the utility model.

[0017] In the figure: oil supply pipe 1, shutdown solenoid valve 2, pressure oil pipe 3, signal oil pipe 4, oil pressure control assembly 5, supply pipe 6, actuator 7, steam turbine 8, feed water pump 9, coupling 10, electronic speed governor 11, mechanical lever controller 12, oil return pipe 13, pressure relief valve I 14, pressure relief valve II 15, regulating valve I 16, regulating valve II 17, regulating valve III 18. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be further specifically described below with reference to embodiments and in conjunction with the accompanying drawings.

[0019] Example: Figure 1 and Figure 2 As shown, a feedwater pump steam turbine layered speed regulation structure includes a steam turbine 8, a feedwater pump 9 rotatably connected to the turbine 8 at one end, and a coupling 10 disposed between the turbine 8 and the feedwater pump 9. An oil supply pipe 1 is disposed at the other end of the steam turbine 8, communicating with the turbine 8 via a pipeline. A shutdown solenoid valve 2 is disposed between the oil supply pipe 1 and the steam turbine 8. An oil pressure control assembly 5 is disposed between the shutdown solenoid valve 2 and the steam turbine 8. A pressure oil pipe 3 and a signal oil pipe 4 are disposed between the oil pressure control assembly 5 and the shutdown solenoid valve 2. A feedback oil pipe 6 is disposed between the oil pressure control assembly 5 and the steam turbine 8. The oil pressure control assembly 5 includes a regulating valve I 16. The oil pressure control assembly 5 also includes regulating valves II 17 and III 18, which are connected in parallel with the regulating valve I 16.

[0020] A pressure relief valve I 14 is installed between the signal oil pipe 4 and the steam turbine 8. An actuator 7 is installed between the pressure relief valve I 14 and the steam turbine 8. A mechanical lever controller 12 is installed between the actuator 7 and the pressure relief valve I 14. An electronic speed governor 11 is installed between the actuator 7 and the steam turbine 8, connected in parallel with the actuator 7. A pressure relief valve II 15, one end of which is connected to the signal oil pipe 4, is installed between the pressure relief valve I 14 and the shutdown solenoid valve 2. The other ends of the pressure relief valves I 14 and II 15 are each connected to the return oil pipe 13, connected to the pressure relief valves I 14 and II 15, respectively.

[0021] Working principle: Before the steam turbine 8 is started, the actuator 7 controls the pressure relief valve I 14 to be fully opened, and the motor controls the pressure relief valve II 15 to be fully opened; when the steam turbine 8 is started manually, the actuator 7 controls the pressure relief valve I 14 to be fully closed; when the steam turbine 8 is started, the electronic speed governor 11 is also switched to the running state. At this time, the pressure relief valve I 14 is always kept fully closed and the pressure relief valve II 15 is fully opened. The given speed of the electronic speed governor 11 is set at the speed required by the user. Therefore, before the speed of the steam turbine 8 reaches this given speed, the electronic speed governor 11 always outputs the maximum signal to ensure that the actuator 7 remains in the maximum position, that is, the pressure relief valve I 14 is fully closed. The adjustment of the steam turbine 8 speed from 0 to the given value is controlled by the pressure relief valve II 15. When the speed reaches the given speed, the electronic speed governor 11 always outputs the maximum signal to ensure that the actuator 7 remains in the maximum position, that is, the pressure relief valve I 14 is fully closed. When the speed reaches the given value and stabilizes, the pressure relief valve II 15 continues to close downward. If the pressure relief valve I 14 is still in the fully closed state, the speed will increase. At this time, in order to stabilize the speed of the turbine 8 at the given value, the electronic speed governor 11 sends a signal to the actuator 7 to gradually open the pressure relief valve I 14 until the pressure relief valve II 15 is fully closed, thereby switching the turbine speed to be controlled by the pressure relief valve I 14; when the speed of the turbine 8 is greater than the given value, the control is achieved through the operation panel of the electronic speed governor 11 and the remote speed setting.

[0022] When the remote speed setting signal loses power, the turbine speed remains at the current speed; when the power supply of the electronic speed governor 11, the actuator 7 or the communication signal between the two is lost, for equipment safety considerations, the actuator 7 controls the pressure relief valve I 14 to the fully open position and the speed decreases.

[0023] In summary, this feedwater pump turbine tiered speed control structure features a simple structure, good operational stability, and high safety and reliability. By controlling the pressure of the signal oil, the opening of the regulating valve is determined by the pressure of the signal oil, thereby achieving closed-loop control of the turbine speed.

[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 feedwater pump steam turbine layered speed regulation structure, characterized by: The invention comprises a steam turbine (8), a water feed pump (9) having one end connected to the steam turbine (8) in a rotating shaft manner, an oil supply pipe (1) connected to the steam turbine (8) in a pipeline manner is provided at the other end of the steam turbine (8), a shutdown solenoid valve (2) is provided between the oil supply pipe (1) and the steam turbine (8), an oil pressure regulating assembly (5) is provided between the shutdown solenoid valve (2) and the steam turbine (8), a pressure oil pipe (3) and a signal oil pipe (4) are provided between the oil pressure regulating assembly (5) and the shutdown solenoid valve (2), and a feedback oil pipe (6) is provided between the oil pressure regulating assembly (5) and the steam turbine (8); the oil pressure regulating assembly (5) comprises a regulating valve I (16).

2. The feedwater pump steam turbine layered speed regulation structure according to claim 1, characterized in that: The oil pressure regulating assembly (5) further comprises a regulating valve II (17) and a regulating valve III (18) which are in a parallel linkage structure with the regulating valve I (16).

3. The feedwater pump steam turbine layered speed regulation structure according to claim 1, characterized in that: A pressure relief valve I (14) is provided between the signal oil pipe (4) and the steam turbine (8), an actuator (7) is provided between the pressure relief valve I (14) and the steam turbine (8), and a mechanical lever controller (12) is provided between the actuator (7) and the pressure relief valve I (14).

4. The feedwater pump steam turbine layered speed regulation structure according to claim 3, characterized in that: An electronic speed regulator (11) is provided between the actuator (7) and the steam turbine (8) and is connected to the actuator (7) in a parallel circuit.

5. The feedwater pump steam turbine layered speed regulation structure according to claim 3, characterized in that: A pressure relief valve II (15) is provided between the pressure relief valve I (14) and the shutdown solenoid valve (2), one end of which is connected to the signal oil pipe (4).

6. The feedwater pump steam turbine layered speed regulation structure according to claim 5, characterized in that: The other end of the pressure relief valve I (14) and the other end of the pressure relief valve II (15) are both provided with an oil return pipe (13) which is in communication with the pressure relief valve I (14) and the pressure relief valve II (15) respectively.

7. The feedwater pump steam turbine layered speed regulation structure according to claim 1, characterized in that: A coupling (10) is provided between the steam turbine (8) and the feed water pump (9).

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