Flushing structure for flushing EH oil system of steam turbine

Abstract

The utility model relates to the technical field of EH oil system flushing, in particular to a flushing structure used for flushing an EH oil system of a steam turbine, the EH oil system comprises an oil supply system and a hydraulic servo-motor, the oil supply system comprises an oil supply tank and an oil supply pump, the oil supply tank is communicated with the pumping end of the oil supply pump, and the hydraulic servo-motor comprises an oil cylinder and an integrated module. An oil inlet cavity channel, an oil return cavity channel and a communication cavity channel are formed in the integrated module, the oil inlet end of the oil inlet cavity channel is communicated with the pumping-out end of the oil supply pump, one end of the communication cavity channel is communicated with the interior of the oil cylinder, a manual electromagnetic valve is installed on the integrated module of the hydraulic servo-motor, and an oil inlet channel and an oil return channel are formed in the manual electromagnetic valve. The oil inlet cavity channel, the oil inlet channel and the communicating cavity channel are sequentially communicated, the interior of the oil cylinder is communicated with the oil inlet end of the oil return channel through a pipeline, the oil outlet end of the oil return channel is communicated with the oil inlet end of the oil return cavity channel, and the oil outlet end of the oil return cavity channel is communicated with the oil supply tank. According to the hydraulic servo-motor, the interior of the oil cylinder of the hydraulic servo-motor can be effectively flushed with low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of EH oil system flushing, in particular to a flushing structure used for flushing an EH oil system of a steam turbine. Background Art

[0002] The EH system is the actuator of the controlled object, including the oil motor that controls the valve and the EH oil supply system that provides high-pressure fire-resistant oil to the oil motor. The oil motor includes an oil cylinder, and the extension and retraction of the oil cylinder is used to control the opening of the valve. In addition, it also includes emergency shut-off control blocks (solenoid valves) and diaphragm valves that control the emergency shutdown of the oil motor. The function of the EH system is to accept the output instructions of the DEH control system, control the opening of the turbine steam inlet valve, change the steam flow entering the turbine, and meet the requirements of turbine speed and load regulation.

[0003] For NCJK330-17.3 / 1.3 / 540 / 540 subcritical, single intermediate reheat, single shaft, three cylinders, single extraction (industrial extraction), indirect air cooling, double exhaust condensing steam turbine, the turbine EH oil system needs to be flushed once during the shutdown and maintenance of the turbine unit. The running solenoid valve cannot usually be used during the flushing, because the running solenoid valve is an automatic solenoid valve with a relatively precise internal structure. When impurities enter the running solenoid valve, it is easy to cause the internal channel of the running solenoid valve to be blocked, which in turn causes the running solenoid valve to fail to work normally. The price of the running solenoid valve is relatively high. If the running solenoid valve is used to flush the inside of the oil cylinder once , the damage rate of the running solenoid valve is high and the cost is high; therefore, during a flushing, the running solenoid valve on the integrated module is usually removed first, and then a flushing plate is installed on the integrated module. The flushing plate is not connected to the oil inlet cavity of the oil cylinder on the steam inlet valve. During flushing, the hydraulic oil can only flush the integrated module and its external pipeline, while the inside of the oil cylinder on the steam inlet valve cannot be effectively flushed, making it impossible for the EH oil inside the oil cylinder to be filtered through a single flushing. The EH oil accumulated in the oil cylinder for a long time will have problems such as impurities and particulate matter, which poses a certain safety hazard to the operation of the valve, and during the operation of the valve, the main regulating valve is prone to problems such as the electromagnetic servo valve getting stuck. Utility Model Content

[0004] The utility model aims to provide a flushing structure for flushing an EH oil system of a steam turbine, so as to solve the problem that it is inconvenient to effectively flush the inside of an oil cylinder of a main regulating valve of the EH oil system at low cost.

[0005] The utility model is realized by the following technical solutions:

[0006] A flushing structure for flushing the EH oil system of a steam turbine. The EH oil system includes an oil supply system and an oil actuator. The oil supply system includes an oil supply tank and an oil supply pump. The oil supply tank is communicated with the pump inlet end of the oil supply pump. The oil actuator includes an oil cylinder and an integrated module. An oil inlet channel, an oil return channel and a communication channel are arranged inside the integrated module. The oil inlet end of the oil inlet channel is communicated with the pump outlet end of the oil supply pump. One end of the communication channel is communicated with the inside of the oil cylinder. A manual solenoid valve is installed on the integrated module of the oil actuator. An oil inlet channel and an oil return channel are arranged inside the manual solenoid valve. The oil inlet channel, the oil inlet channel and the communication channel are communicated in sequence. The inside of the oil cylinder is communicated with the oil inlet end of the oil return channel through a pipeline. The oil outlet end of the oil return channel is communicated with the oil inlet end of the oil return chamber. The oil outlet end of the oil return chamber is communicated with the oil supply tank.

[0007] Further, a return oil pipe is communicated between the oil outlet end of the oil return chamber and the oil supply tank. A return oil valve is arranged on the return oil pipe. A bypass pipe is communicated with a pipe section of the return oil pipe close to the oil inlet end of the return oil valve. A bypass valve is arranged on the bypass pipe. One end of the bypass pipe far away from the return oil pipe is communicated with a waste oil tank. A magnetic adsorption device is arranged inside the waste oil tank. The magnetic adsorption device is used for adsorbing iron particles in the hydraulic oil entering the waste oil tank.

[0008] Further, the magnetic adsorption device includes a receiving oil tank. The receiving oil tank is located above the inside of the waste oil tank. The receiving oil tank is open at the top. The oil outlet end of the bypass pipe is communicated with the top opening of the receiving oil tank. A plurality of magnetic bars are horizontally arranged inside the receiving oil tank. A gap is left between adjacent two magnetic bars. A leakage hole is opened on the bottom wall of the receiving oil tank.

[0009] Further, a suction pipe is communicated between the top wall of the waste oil tank and the oil supply tank. One end of the suction pipe extends into the waste oil tank after passing through the top wall of the waste oil tank. And a space for precipitating impurities is left between the oil inlet end of the suction pipe and the bottom wall of the waste oil tank. A suction oil pump is arranged on the suction pipe.

[0010] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0011] In the present utility model, when regularly flushing the EH oil system of a steam turbine, the operating solenoid valve on the integrated module can be disassembled, and then the manual solenoid valve is installed on the integrated module. The oil motor is closed, the manual solenoid valve is opened, and the oil supply pump is started. The oil supply pump pumps the hydraulic oil inside the oil supply tank into the oil cylinder at a relatively high flow rate and large flow, so as to perform a circulating flush on the inside of the oil cylinder. By replacing and cleaning the EH oil in the oil cylinder, the safe and stable operation of the speed regulation and safety protection system of the steam turbine is ensured. Moreover, in this solution, the manual solenoid valve is used to conduct the integrated module and the inside of the oil cylinder. Since the manual solenoid valve itself has a relatively low price, and the internal structure of the manual solenoid valve has a lower precision compared to the operating solenoid valve and requires a lower cleanliness of the fluid, the manual solenoid valve can be used multiple times. Even if the manual solenoid valve becomes blocked due to being used for flushing, the cost of replacing the manual solenoid valve is also relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, form a part of this application, and do not limit the embodiments of the present utility model.

[0013] In the drawings:

[0014] Figure 1 is a schematic structural diagram of the present utility model;

[0015] Figure 2 of the present utility model Figure 1 is an enlarged view of part A.

[0016] The reference numerals and corresponding component names in the drawings:

[0017] 1. Oil supply tank; 2. Oil supply pump; 3. Oil cylinder; 4. Integrated module; 5. Oil inlet chamber; 6. Oil return chamber; 7. Communication chamber; 8. Manual solenoid valve; 9. Oil inlet passage; 10. Oil return passage; 11. Oil return pipe; 12. Oil return valve; 13. Bypass pipe; 14. Bypass valve; 15. Waste oil tank; 16. Connection tank; 17. Magnetic bar; 18. Oil leakage hole; 19. Suction pipe; 20. Suction pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions, and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in combination with the embodiments and the drawings. The illustrative embodiments and descriptions thereof of the present utility model are only used to explain the present utility model and do not limit the present utility model. It should be noted that the present utility model has been in the actual R & D and use stage.

[0019] Embodiment 1

[0020] A flushing structure for flushing the EH oil system of a steam turbine, referring to Figure 1, the EH oil system includes an oil supply system and an oil actuator. The oil supply system includes an oil supply tank 1 and an oil supply pump 2. The oil supply tank 1 is connected to the pump inlet end of the oil supply pump 2. The oil actuator includes an oil cylinder 3 and an integrated module 4. Inside the integrated module 4, there are an oil inlet channel 5, an oil return channel 6, and a communication channel 7. The oil inlet end of the oil inlet channel 5 is connected to the pump outlet end of the oil supply pump 2. One end of the communication channel 7 is connected to the inside of the oil cylinder 3. A manual solenoid valve 8 is installed on the integrated module 4 of the oil actuator. Inside the manual solenoid valve 8, there are an oil inlet channel 9 and an oil return channel 10. The oil inlet channel 5, the oil inlet channel 9, and the communication channel 7 are connected in sequence. The inside of the oil cylinder 3 is connected to the oil inlet end of the oil return channel 10 through a pipeline. The oil outlet end of the oil return channel 10 is connected to the oil inlet end of the oil return channel 6. The oil outlet end of the oil return channel 6 is connected to the oil supply tank 1.

[0021] In this solution, when the EH oil system of the steam turbine is flushed regularly, the operating solenoid valve on the integrated module 4 can be disassembled, and then the manual solenoid valve 8 is installed on the integrated module 4. The oil actuator is closed, the manual solenoid valve 8 is opened, and the oil supply pump 2 is started. The oil supply pump 2 pumps the hydraulic oil inside the oil supply tank 1 into the oil cylinder 3 at a relatively high flow rate and large flow volume, and then the inside of the oil cylinder 3 can be circulated and flushed. By replacing and cleaning the EH oil inside the oil cylinder 3, the safe and stable operation of the speed regulation and safety protection system of the steam turbine is ensured. Moreover, in this solution, the manual solenoid valve 8 is used to conduct between the integrated module 4 and the inside of the oil cylinder 3. Since the manual solenoid valve 8 itself has a relatively low price, and the internal structure of the manual solenoid valve 8 has a lower precision compared to the operating solenoid valve and has a lower requirement for the cleanliness of the fluid, the manual solenoid valve 8 can be used multiple times. Even if the manual solenoid valve 8 becomes blocked due to being used for flushing, the cost of replacing the manual solenoid valve 8 is also relatively low.

[0022] Embodiment 2

[0023] Based on Embodiment 1, in this embodiment, referring to Figure 1 , Figure 2 , a return oil pipe 11 is connected between the oil outlet end of the oil return channel 6 and the oil supply tank 1. A return oil valve 12 is provided on the return oil pipe 11. A bypass pipe 13 is connected to the pipe section of the return oil pipe 11 near the oil inlet end of the return oil valve 12. A bypass valve 14 is provided on the bypass pipe 13. One end of the bypass pipe 13 away from the return oil pipe 11 is connected to a waste oil tank 15. A magnetic adsorption device is provided inside the waste oil tank 15. The magnetic adsorption device is used to adsorb iron particles in the hydraulic oil entering the waste oil tank 15.

[0024] In this solution, after the manual solenoid valve 8 is installed, initially, the oil return valve 12 is closed, the bypass valve 14 is opened, the oil motor is closed, the manual solenoid valve 8 is opened, and then the oil supply pump 2 is started. After the hydraulic oil flushes the oil cylinder 3, the impurities in the oil cylinder 3 are transported to the waste oil tank 15 through the oil return pipe 11 and the bypass pipe 13 along with the hydraulic oil. Then, the magnetic adsorption device in the waste oil tank 15 adsorbs and filters the iron particles in the waste oil, and the remaining waste oil enters the waste oil tank 15 for sedimentation for a period of time. Other impurities in the waste oil settle to the bottom of the waste oil tank 15, facilitating the reuse of the relatively clean hydraulic oil in the upper layer inside the waste oil tank 15. Preliminary filtration of the waste oil by the magnetic adsorption method and the sedimentation method can reduce the burden on the filter element used by the oil supply pump 2 to filter impurities, which is beneficial to extending the service life of its filter element.

[0025] Embodiment 3

[0026] On the basis of Embodiment 2, in this embodiment, referring to Figure 1 、 Figure 2 , the magnetic adsorption device includes a receiving oil tank 16. The receiving oil tank 16 is located above the inner side wall of the waste oil tank 15. The receiving oil tank 16 is provided with an opening at the top. The oil outlet end of the bypass pipe 13 is communicated with the opening at the top of the receiving oil tank 16. A plurality of magnetic bars 17 are horizontally arranged inside the receiving oil tank 16, and there is a gap between adjacent two magnetic bars 17. A leakage hole 18 is opened on the bottom wall of the receiving oil tank 16.

[0027] In this solution, the bypass pipe 13 transports the hydraulic oil containing more impurities to the inside of the receiving oil tank 16. When the iron particles in the waste oil come into contact with the magnetic bars 17, they are adsorbed by the magnetic bars 17, and the remaining waste oil enters the waste oil tank 15 through the leakage hole 18 below the receiving oil tank 16 for sedimentation treatment.

[0028] Embodiment 4

[0029] On the basis of Embodiment 3, in this embodiment, referring to Figure 1 、 Figure 2 , a suction pipe 19 is connected and arranged between the top wall of the waste oil tank 15 and the oil supply tank 1. One end of the suction pipe 19 passes through the top wall of the waste oil tank 15 and extends into the waste oil tank 15, and there is a space for sedimenting impurities between the oil inlet end of the suction pipe 19 and the bottom wall of the waste oil tank 15. A suction pump 20 is arranged on the suction pipe 19.

[0030] In this solution, when there is more hydraulic oil temporarily stored in the waste oil tank 15, the suction pump 20 is started. The suction pump 20 can extract the relatively clean hydraulic oil in the upper layer of the waste oil tank 15 and send it to the oil supply tank 1 for recycling.

[0031] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present utility model. It should be understood that the above description is only for the specific embodiments of the present utility model and is not used to limit the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A flushing structure for flushing the EH oil system of a steam turbine. The EH oil system includes an oil supply system and an oil actuator. The oil supply system includes an oil supply tank (1) and an oil supply pump (2). The oil supply tank (1) is communicated with the pump inlet end of the oil supply pump (2). The oil actuator includes an oil cylinder (3) and an integration module (4). An oil inlet channel (5), an oil return channel (6) and a communication channel (7) are arranged inside the integration module (4). The oil inlet end of the oil inlet channel (5) is communicated with the pump outlet end of the oil supply pump (2). One end of the communication channel (7) is communicated with the inside of the oil cylinder (3). It is characterized in that: A manual solenoid valve (8) is installed on the integrated module (4) of the servomotor. An oil inlet passage (9) and an oil return passage (10) are arranged inside the manual solenoid valve (8). The oil inlet cavity (5), the oil inlet passage (9) and the communication cavity (7) are communicated in sequence. The inside of the oil cylinder (3) is communicated with the oil inlet end of the oil return passage (10) through a pipeline. The oil outlet end of the oil return passage (10) is communicated with the oil inlet end of the oil return cavity (6). The oil outlet end of the oil return cavity (6) is communicated with the oil supply tank (1).

2. The flushing structure for flushing the EH oil system of a steam turbine according to claim 1, wherein: A return oil pipe (11) is communicated between the oil outlet end of the oil return cavity (6) and the oil supply tank (1). A return oil valve (12) is arranged on the return oil pipe (11). A bypass pipe (13) is communicated with a pipe section of the return oil pipe (11) close to the oil inlet end of the return oil valve (12). A bypass valve (14) is arranged on the bypass pipe (13). One end of the bypass pipe (13) far from the return oil pipe (11) is communicated with a dirt oil tank (15). A magnetic adsorption device is arranged inside the dirt oil tank (15). The magnetic adsorption device is used for adsorbing iron particles in the hydraulic oil entering the dirt oil tank (15).

3. The flushing structure for flushing the EH oil system of a steam turbine according to claim 2, characterized in that: The magnetic adsorption device includes an oil receiving tank (16). The oil receiving tank (16) is located above the inside of the dirt oil tank (15). The oil receiving tank (16) is provided with an opening at the upper part. The oil outlet end of the bypass pipe (13) is communicated with the opening at the upper part of the oil receiving tank (16). A plurality of magnetic bars (17) are horizontally arranged inside the oil receiving tank (16). A gap is left between two adjacent magnetic bars (17). An oil leakage hole (18) is formed in the bottom wall of the oil receiving tank (16).

4. A flushing structure for flushing the EH oil system of a steam turbine according to claim 3, characterized in that: A suction pipe (19) is communicated between the top wall of the dirt oil tank (15) and the oil supply tank (1). One end of the suction pipe (19) extends into the dirt oil tank (15) after passing through the top wall of the dirt oil tank (15). And a space for precipitating impurities is left between the oil inlet end of the suction pipe (19) and the bottom wall of the dirt oil tank (15). A suction pump (20) is arranged on the suction pipe (19).

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