Steam seal pressure adjusting device of steam turbine

Abstract

The utility model relates to the technical field of pressure regulation, in particular to a steam turbine steam seal pressure regulating device which comprises a device body, a controller is arranged on the front portion of the device body, a pressure transmitter is fixedly arranged in the device body, and a temperature sensor is arranged at the bottom of the pressure transmitter. A valve body frame is arranged on the outer side of the steam inlet adjusting valve and the outer side of the steam outlet adjusting valve, a valve rod is arranged in the valve body frame, a butterfly valve is arranged at the bottom of the valve rod, a limiting frame is arranged at the top of the valve rod, the limiting frame is arranged in the valve body frame, a valve block is arranged at the position, located at the top of the valve rod, in the limiting frame, and a rotating shaft is arranged at the top of the valve block. According to the utility model, the controller, the pressure transmitter, the temperature sensor and the digital-to-analog converter are arranged, and the pressure transmitter senses the pressure value constantly, so that the internal pressure of the steam turbine is effectively controlled within a certain range, the accuracy of pressure control is improved, and the labor force is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure regulation, in particular to a steam turbine steam seal pressure regulating device. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. High-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated airflow and is then sprayed onto the blades, causing the rotor equipped with the blade rows to rotate and perform work externally. To ensure the stability of the internal flow frame chamber vacuum system of the condensing steam turbine, it is necessary to control the steam seal pressure in the steam turbine so that the inside of the steam turbine is relatively isolated from the outside world.

[0003] When the steam seal pressure is too high, part of the steam will escape from the bearing seal, which not only wastes energy but also affects the appearance. When the steam seal pressure is too low, the vacuum degree will decrease, reducing the efficiency of the turbine operation. Therefore, it is particularly important to accurately control the steam seal pressure.

[0004] A Chinese patent discloses a turbine connecting pipe pressure regulating butterfly valve (authorization announcement number CN 208417554 U). The patented technology can ensure the long-term normal operation of the flow regulation of the pipeline system, and the valve has a compact structure, is easy to maintain, and has a small flow resistance. However, in the existing turbine control system, the control of the steam seal pressure of the flow frame chamber inside the turbine has always been completed manually, and the steam seal pressure is completely controlled by the operator manually adjusting the steam seal steam inlet regulating valve. Since the steam seal pressure changes with the change of the turbine load, the manual control of the steam seal pressure has low accuracy and is difficult to achieve satisfactory results; and the operator needs to adjust in real time, which is a large workload. The valve stem in the regulating butterfly valve is often exposed to the outside, and the valve stem is easily affected by external factors, resulting in rotation, which reduces the stability of the butterfly valve when in use. When the valve stem adjusts the valve plate in the valve body to the maximum opening or closing, the fixing operation of the valve stem is relatively troublesome and takes a lot of time.

[0005] Therefore, those skilled in the art provide a steam turbine steam seal pressure regulating device to solve the problems raised in the above background technology. Utility Model Content

[0006] To solve the above technical problems, the present utility model provides a steam turbine gland pressure regulating device, which includes a device main body, an inlet steam regulating valve and an outlet steam regulating valve. A controller is provided at the front part of the device main body. A pressure transmitter is fixedly arranged inside the device main body. A temperature sensor is provided at the bottom of the pressure transmitter. The outside of the inlet steam regulating valve and the outlet steam regulating valve is provided with a valve body frame. A valve rod is arranged inside the valve body frame. A butterfly valve is provided at the bottom of the valve rod. A limiting frame is provided at the top of the valve rod. The limiting frame is arranged inside the valve body frame. A valve block is provided at the top of the valve rod inside the limiting frame. A rotating shaft is provided at the top of the valve block. A motor is provided at the top of the rotating shaft.

[0007] Preferably: A digital-to-analog converter is provided on the right side of the controller. An inlet steam pipe body is provided at the left side part of the device main body. The inlet steam regulating valve is arranged on the inlet steam pipe body. An outlet steam pipe body is provided at the right end of the device main body. The outlet steam regulating valve is arranged on the outlet steam pipe body. A connecting wire one is connected between the pressure transmitter and the controller.

[0008] Preferably: The temperature sensor is used to control the internal temperature of the device main body. A connecting wire two is connected between the temperature sensor and the controller. An inner cavity is provided inside the device main body. The top of the motor is fixed on the top wall of the limiting frame. Considering the control requirements of the steam turbine gland pressure, the controller can adopt a programmable logic controller.

[0009] The technical effects and advantages of the present utility model:

[0010] 1. Through the settings of the controller, the pressure transmitter, the temperature sensor and the digital-to-analog converter in the present utility model, since the pressure transmitter constantly senses the magnitude of the pressure value, the internal pressure of the steam turbine is effectively controlled within a certain range, which is beneficial to improving the accuracy of pressure control and saving labor at the same time.

[0011] 2. Through the settings of the motor, the rotating shaft, the limiting frame, the butterfly valve, the valve rod and the valve block in the present utility model, when the valve rod and the valve block are in the open or closed state, the controller can limit the rotation of the valve rod by rotating the rotating shaft and the valve block, so as to quickly control and accurately know whether the butterfly valve is accurately closed or opened, and can increase the friction force used when the valve rod rotates, avoid the valve rod from loosening, and improve the stability of the valve plate connected to the lower end of the valve rod. Brief Description of the Drawings

[0012] Figure 1 is a structural schematic diagram of a steam turbine gland pressure regulating device provided by an embodiment of the present application Figure 1 ;

[0013] Figure 2 is a structural schematic diagram of a steam turbine gland pressure regulating device provided by an embodiment of the present application Figure 2 ;

[0014] Figure 3 It is a schematic structure diagram of a steam turbine gland pressure regulating device provided by an embodiment of the present application Figure 3 ;

[0015] Figure 4 It is a schematic structure diagram of a valve body frame, a valve rod, a butterfly valve, a limit frame and a valve block in a steam turbine gland pressure regulating device provided by an embodiment of the present application;

[0016] Figure 5 It is a schematic structure diagram of a steam turbine gland pressure regulating device provided by an embodiment of the present application Figure 4 ;

[0017] Figure 6 It is a steam turbine gland pressure regulating device provided by an embodiment of the present application Figure 4 and is a schematic structure diagram at position A in the device.

[0018] In the figure: 1, device main body; 2, controller; 3, digital-to-analog converter; 4, steam inlet pipe body; 5, steam inlet regulating valve; 6, steam outlet pipe body; 7, steam outlet regulating valve; 8, pressure transmitter; 9, connecting wire one; 10, temperature sensor; 11, connecting wire two; 12, inner cavity body; 13, valve body frame; 14, valve rod; 15, butterfly valve; 16, limit frame; 17, valve block; 18, motor; 19, rotating shaft. Specific embodiments

[0019] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present utility model are given for the purpose of illustration and description, and are not exhaustive or limit the present utility model to the disclosed form. Many modifications and variations will be obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present utility model, and to enable those of ordinary skill in the art to understand the present utility model and thus design various embodiments with various modifications suitable for specific purposes. Embodiment

[0020] Please refer to Figures 1 to 6, in this embodiment, a steam turbine gland pressure regulating device is provided, which includes a device main body 1, an inlet steam regulating valve 5 and an outlet steam regulating valve 7. A controller 2 is arranged at the front part of the device main body 1, and a digital-to-analog converter 3 is arranged on the right side of the controller 2. An inlet steam pipe body 4 is arranged at the left side part of the device main body 1, and the inlet steam regulating valve 5 is arranged on the inlet steam pipe body 4. An outlet steam pipe body 6 is arranged at the right end of the device main body 1, and the outlet steam regulating valve 7 is arranged on the outlet steam pipe body 6. A pressure transmitter 8 is fixedly arranged inside the device main body 1. A connecting wire one 9 is connected between the pressure transmitter 8 and the controller 2. A temperature sensor 10 is arranged at the bottom of the pressure transmitter 8. The temperature sensor 10 is used to control the temperature inside the device main body by the controller 2, and a connecting wire two 11 is connected between the temperature sensor 10 and the controller 2. An inner cavity 12 is opened inside the device main body. A valve body frame 13 is arranged outside the inlet steam regulating valve 5 and the outlet steam regulating valve 7. A valve rod 14 is arranged inside the valve body frame 13. A butterfly valve 15 is arranged at the bottom of the valve rod 14. A limit frame 16 is arranged at the top of the valve rod 14. The limit frame 16 is arranged inside the valve body frame 13. A valve block 17 is arranged at the top of the valve rod 14 inside the limit frame 16. A rotating shaft 19 is arranged at the top of the valve block 17, and a motor 18 is arranged at the top of the rotating shaft 19. The top of the motor 18 is fixed on the top wall of the limit frame 16; during use, the control ends of the inlet steam regulating valve 5 and the outlet steam regulating valve 7 are both connected to the controller 2 through a digital-to-analog conversion module. The controller 2 controls the opening and closing of the regulating valve according to the magnitude of the internal pressure value of the steam turbine transmitted by the pressure transmitter 8. The temperature sensor 10 is used to display the temperature inside the device body 1 to determine the opening and closing of the outlet steam pipe body 6 and the inlet steam pipe body 4;

[0021] Considering the control requirements of the steam turbine gland pressure, the controller 2 can adopt a programmable logic controller 2. For example, an Omron CJ1 series PLC and a PROFACE human-machine interface are used as the core of the whole process control. A data and analog-to-digital conversion module is integrated inside it. The output current range of its analog output pin is 4 - 20 mA. Its corresponding analog signal input terminal of the regulating valve is connected, so that the opening value of the regulating valve corresponds to the change of the current value from 4 mA to 20 mA from 0% to 100%, that is, the opening values of the inlet steam regulating valve 5 and the outlet steam regulating valve 7 are proportional to the output current intensity of the controller 2;

[0022] Since the pressure transmitter 8 constantly senses the magnitude of the pressure value, the internal pressure of the steam turbine is effectively controlled within a certain range, which is beneficial to improving the accuracy of pressure control while saving labor;

[0023] The utility model is provided with a motor 18, a rotating shaft 19, a limiting frame 16, a butterfly valve 15, a valve rod 14 and a valve block 17. When the valve rod 14 and the valve block 17 are in the open or closed state, the controller 2 can limit the rotation of the valve rod 14 by rotating the rotating shaft 19 and the valve block 17, so as to quickly control and know whether the butterfly valve 15 is accurately closed or opened, and can increase the friction force used when the valve rod 14 rotates, avoid the loosening of the valve rod 14, and improve the stability of the valve plate connected to the lower end of the valve rod 14.

[0024] Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art and related fields without creative work shall fall within the protection scope of the present utility model. The structures, devices and operation methods not specifically described and explained in the present utility model, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A steam turbine gland pressure regulating device, comprising a device main body (1), an inlet steam regulating valve (5) and an outlet steam regulating valve (7), characterized in that, The front part of the device main body (1) is provided with a controller (2). Inside the device main body (1), a pressure transmitter (8) is fixedly arranged. At the bottom of the pressure transmitter (8), a temperature sensor (10) is provided. Outside the steam inlet regulating valve (5) and the steam outlet regulating valve (7), a valve body frame (13) is provided. Inside the valve body frame (13), a valve rod (14) is provided. At the bottom of the valve rod (14), a butterfly valve (15) is provided. At the top of the valve rod (14), a limit frame (16) is provided. The limit frame (16) is arranged inside the valve body frame (13). Inside the limit frame (16) and at the top of the valve rod (14), a valve block (17) is provided. At the top of the valve block (17), a rotating shaft (19) is provided. At the top of the rotating shaft (19), a motor (18) is provided.

2. The steam seal pressure regulating device of a steam turbine according to claim 1, characterized in that, On the right side of the controller (2), a digital-to-analog converter (3) is provided. On the left side of the device main body (1), a steam inlet pipe body (4) is provided.

3. The steam seal pressure regulating device according to claim 2, characterized in that, On the steam inlet pipe body (4), a steam inlet regulating valve (5) is provided. At the right end of the device main body (1), a steam outlet pipe body (6) is provided.

4. A steam turbine gland pressure regulating device according to claim 3, characterized in that, On the steam outlet pipe body (6), a steam outlet regulating valve (7) is provided. A connecting wire one (9) is connected between the pressure transmitter (8) and the controller (2).

5. A steam turbine gland pressure regulating device according to claim 4, characterized in that, The temperature sensor (10) is used to control the temperature inside the device main body (1) by the controller (2). A connecting wire two (11) is connected between the temperature sensor (10) and the controller (2). Inside the device main body (1), an inner cavity (12) is provided.

6. The steam seal pressure regulating device of a steam turbine according to claim 1, characterized in that, The top of the motor (18) is fixed on the top wall of the limit frame (16). The controller (2) adopts a programmable logic controller (2).

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