Flushing system for steam turbine control oil pipeline

Abstract

The invention provides a flushing system for a steam turbine control oil pipeline, and relates to the technical field of steam turbine overhaul, the flushing system comprises a machine shell, an oil supply assembly is arranged in the machine shell, the inlet end of the oil supply assembly is connected with the outlet end of a pressure relief and slow release assembly, and the inlet end of the pressure relief and slow release assembly is connected with the outlet end of a filter assembly; the outlet end of the oil supply assembly and the inlet end of the filtering assembly are connected with communicating pipes, and the communicating pipes are connected with a hydraulic servo-motor inlet pipeline and a hydraulic servo-motor outlet pipeline through connecting assemblies respectively. And the filter monitoring assembly is used for monitoring the cleanliness of a filter screen of the filter assembly. The invention solves the technical problems that the hydraulic servo-motor is easily blocked and the flushing oil liquid is not reused when the steam turbine control oil pipeline is flushed.

Description

Technical Field

[0001] The invention belongs to the field of steam turbine maintenance, and in particular relates to a flushing system for a steam turbine control oil pipeline. Background Art

[0002] The steam turbine control oil system plays a vital role in the steam turbine. It is responsible for accurately controlling the opening and closing and adjustment of the high, medium and low pressure main steam valves, main steam valves, regulating valves and medium and low pressure bypass valves of the steam turbine to ensure the safe and efficient operation of the steam turbine. The steam turbine control oil system is a high-precision adjustment system with very high requirements on oil quality. The failures of the servo valve, solenoid valve and throttling orifice plate in the system are also mostly related to the oil quality. Therefore, the control of oil quality is very important for the safe and reliable operation of the unit. Therefore, when the steam turbine control oil system has been overhauled and there is welding work in the system, the system is easily contaminated and must be circulated and flushed to remove the welding slag that may be generated in the pipeline and the dust and oxide scale on the inner wall of the pipeline.

[0003] The existing steam turbine control oil pipeline flushing system generally adopts a circulation method with an oil motor for flushing during operation. However, there is a significant problem in this process: the oil often carries some foreign matter when circulating. These foreign matter may enter the interior of the oil motor as the oil flows. Since the internal pipelines of the oil motor are designed to be relatively small and complex, these foreign matter can easily get stuck in them and cannot be discharged smoothly. Once the foreign matter gets stuck in the oil motor, it will seriously affect the normal operation of the oil motor and even cause the paralysis of the entire steam turbine control oil system, thereby affecting the overall performance and safety of the steam turbine. At the same time, the oil in the steam turbine control oil pipeline flushing system is discarded after flushing and is no longer reused, resulting in a certain amount of waste of oil. Summary of the invention

[0004] The present invention provides a flushing system for a steam turbine control oil pipeline, which is used to solve at least one technical problem raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention discloses a flushing system for a steam turbine control oil pipeline, comprising: a casing, an oil supply assembly is arranged in the casing, the inlet end of the oil supply assembly is connected to the outlet end of the pressure relief slow release assembly, the inlet end of the pressure relief slow release assembly is connected to the outlet end of the filter assembly, the outlet end of the oil supply assembly and the inlet end of the filter assembly are both connected to a connecting pipe, and the connecting pipe is respectively connected to the oil motor inlet pipe and the oil motor outlet pipe through the connecting assembly;

[0006] Also included is a filtration monitoring component for monitoring the cleanliness of the filter screen of the filtration component.

[0007] Preferably, the oil supply assembly includes an oil pump, which is installed in the casing. The input end of the oil pump is connected to the oil storage structure through an oil inlet pipe, and the output end of the oil pump is connected to the oil outlet pipe. A filter valve is provided on the oil outlet pipe. The other end of the oil outlet pipe is connected to the input end of the voltage stabilizing structure, and the output end of the voltage stabilizing structure is connected to a connecting pipe, on which an inlet valve and an outlet valve are respectively provided.

[0008] Preferably, the oil storage structure includes an oil storage tank, the oil outlet and the oil return port respectively pass through and are connected on both sides of the oil storage tank, the oil outlet is connected to the oil inlet pipe flange, the oil return port is connected to the pressure relief slow release assembly, a refueling port is provided on the top of the oil storage tank, the refueling port passes through and is connected to the casing, a cylindrical filter is provided in the refueling port, an oil cap is threadedly connected to the refueling port, three groups of L-shaped support seats are arranged in a ring below the oil storage tank, a hydraulic support is connected below the L-shaped support seat, and the hydraulic support bolts are installed in the casing.

[0009] Preferably, the pressure stabilizing structure includes a pressure stabilizing three-way valve, the input end of the pressure stabilizing three-way valve is connected to the oil outlet pipe flange through a one-way valve, the output end of the pressure stabilizing three-way valve is connected to the connecting pipe flange, an opening and closing valve is threadedly connected to the top of the pressure stabilizing three-way valve, the opening and closing valve is installed at the bottom of the pressure tank, the pressure tank is fixed in the casing, an air bag is provided in the pressure tank, an inflation valve is penetrated through and installed on the top of the pressure tank, and the inflation valve is connected to the air bag.

[0010] Preferably, the connecting assembly includes a connecting head, two connecting heads are flange-connected symmetrically on the left and right, both connecting heads are threadedly connected with connecting sockets, and the connecting sockets are respectively nested and connected to the connecting pipe, the oil motor inlet pipe, and the oil motor outlet pipe.

[0011] Preferably, the filter assembly includes a horizontal filter cartridge, an inlet pipe and an outlet pipe are provided at the bottom of the horizontal filter cartridge, the inlet pipe and the connecting pipe are flange-connected, the outlet pipe is connected to the pressure relief slow release assembly, an open end cover is flange-connected on one side of the horizontal filter cartridge, a slag discharge structure is flange-connected on the other side of the horizontal filter cartridge, a hollow partition is provided in the horizontal filter cartridge, a primary cylindrical filter screen is installed on the hollow partition, a secondary cylindrical filter screen is installed on the other side of the hollow partition, and a filter screen plate is connected to the other end of the secondary cylindrical filter screen.

[0012] Preferably, the slag discharge structure includes a rotating shaft, which passes through and is rotatably connected to the filter disc, and a plurality of scrapers are staggeredly installed on the rotating shaft. The scrapers are slidably connected to the secondary cylindrical filter screen, and an extrusion disc is installed on the side of the rotating shaft away from the filter disc. One end of the rotating shaft is connected to an electric lead screw, which is threaded in a threaded sleeve, and the threaded sleeve is fixedly connected to the slag discharge end cover. A slag discharge pipe is provided at the bottom of the slag discharge end cover, and a pressure valve is installed on the slag discharge pipe.

[0013] Preferably, the pressure relief slow-release assembly includes a valve body, which is provided with a horizontal inlet and a vertical outlet, the horizontal inlet is flange-connected to the outlet pipe, the vertical outlet is flange-connected to the oil return port, a top plug is provided in the valve body, the top plug is slidably connected in the sleeve, a compression elastic member is provided between the top plug and the sleeve, the top plug cooperates with the horizontal inlet, the sleeve is mounted on the overflow baffle, and the overflow baffle is fixed to the valve body.

[0014] Preferably, the filtering monitoring component includes a control module, a data processing module, a detection module and an execution module, and the detection module includes:

[0015] Flow rate sensor 1: used to detect the flow rate of the oil flowing into the inlet pipe in the filter assembly, and is arranged in the inlet pipe (62);

[0016] Flow rate sensor 2: used to detect the flow rate of the oil flowing out of the outlet pipe in the filter assembly, and is arranged in the outlet pipe;

[0017] Pressure sensor 1: used to detect the pressure of the oil flowing into the inlet pipe of the filter assembly, and is arranged in the inlet pipe;

[0018] Pressure sensor 2: used to detect the pressure of the oil flowing out of the outlet pipe of the filter assembly, and is arranged in the outlet pipe;

[0019] Timing sensor: used to detect the slag discharge interval of the filter assembly, which is set on the slag discharge end cover;

[0020] The detection module is electrically connected to the data processing module, the control module is electrically connected to the data processing module and the execution module, and the control module controls the execution module to work based on the data results of the data processing module.

[0021] Preferably, the control module controls the execution module based on the data result of the data processing module, including the following steps:

[0022] Step 1: Calculate the filter cleaning factor F in the flushing system based on the detection values ​​of flow sensor 1, flow sensor 2, pressure sensor 1, pressure sensor 2 and timing sensor c :

[0023]

[0024] Among them: F c is the filter cleaning coefficient, t is the detection value of the timing sensor, E1 is the compensation coefficient of the primary cylindrical filter, P1 is the detection value of the pressure sensor 1, V1 is the detection value of the speed sensor 1, ε1 is the void ratio of the primary cylindrical filter, D1 is the hole diameter of the primary cylindrical filter, E2 is the compensation coefficient of the secondary cylindrical filter, P2 is the detection value of the pressure sensor 2, V2 is the detection value of the speed sensor 2, ε2 is the void ratio of the secondary cylindrical filter, and D2 is the hole diameter of the secondary cylindrical filter;

[0025] Step 2: Data processing module comparison F c and F c0 :

[0026] When F c ≥F c0 When based on F c Calculate the cleaning reciprocating times T of the filter assembly c :

[0027] where F c0 is the filter cleaning coefficient reference value, T c The cleaning reciprocating times of the filter assembly;

[0028] Step 3: The control module controls the execution module to start the filtering component based on T c Clean the secondary cylindrical filter reciprocatingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0031] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0032] Figure 3 It is a structural schematic diagram of the oil storage structure of the present invention;

[0033] Figure 4 It is a structural schematic diagram of the connection assembly of the present invention;

[0034] Figure 5 It is a schematic diagram of the structure of the filter assembly of the present invention.

[0035] In the figure: 1. Casing; 11. Connecting pipe; 12. Oil motor inlet pipe; 13. Oil motor outlet pipe; 2. Oil supply assembly; 21. Oil pump; 22. Oil inlet pipe; 23. Oil outlet pipe; 24. Filter valve; 25. Inlet valve; 26. Outlet valve; 3. Oil storage structure; 31. Oil storage tank; 32. Oil outlet; 33. Oil return port; 34. Refueling port; 35. Cylindrical filter; 36. Oil cap; 37. L-shaped support seat; 38. Hydraulic support; 4. Pressure stabilizing structure; 41. Pressure stabilizing three-way valve; 42. One-way valve; 43. Opening and closing valve; 44. Pressure tank; 45. Air bag; 46. Inflating valve; 5. Connecting assembly; 51. Connector; 52. Connecting socket; 6. Filter assembly; 61. Horizontal filter cartridge; 62. Inlet pipe; 63. Outlet pipe; 64. Open end cover; 65. Hollow partition; 66. Primary cylindrical filter screen; 67. Secondary cylindrical filter screen; 68. Filter screen plate; 7. Slag discharge structure; 71. Rotating shaft; 72. Scraper head; 73. Extrusion plate; 74. Electric lead screw; 75. Threaded sleeve; 76. Slag discharge end cover; 77. Slag discharge pipe; 78. Pressure valve; 8. Pressure relief slow release assembly; 81. Valve body; 82. Horizontal inlet; 83. Vertical outlet; 84. Top plug; 85. Sleeve; 86. Compression elastic member; 87. Overflow baffle. DETAILED DESCRIPTION

[0036] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0037] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] The present invention provides the following embodiments

[0039] Example 1

[0040] The embodiment of the present invention provides a flushing system for a steam turbine control oil pipeline, such as Figure 1-5As shown, it comprises: a casing 1, an oil supply assembly 2 is arranged in the casing 1, the inlet end of the oil supply assembly 2 is connected to the outlet end of the pressure relief slow release assembly 8, the inlet end of the pressure relief slow release assembly 8 is connected to the outlet end of the filter assembly 6, the outlet end of the oil supply assembly 2 and the inlet end of the filter assembly 6 are both connected to a connecting pipe 11, and the connecting pipe 11 is respectively connected to the oil motor inlet pipe 12 and the oil motor outlet pipe 13 through the connecting assembly 5;

[0041] It also includes a filter monitoring component for monitoring the cleanliness of the filter screen of the filter component 6.

[0042] The working principle and beneficial effects of the above technical solution are as follows: when the steam turbine control oil pipeline needs to be flushed, the connecting pipe 11 is connected to the oil motor inlet pipe 12 and the oil motor outlet pipe 13 through the connecting component 5, and the valves at the oil motor inlet and outlet are closed, and then the oil supply component 2 is started to pressurize the oil supply to the steam turbine control oil pipeline. When the flushing oil flows out of the steam turbine control oil pipeline, it enters the filter component 6 to filter the foreign matter in the flushing oil. The flushing oil after filtering is depressurized by the pressure relief slow release component 8 and then flows back into the oil supply component 2, so as to realize a cycle of flushing of the steam turbine control oil pipeline;

[0043] The present invention utilizes the connecting component 5 to directly connect the connecting pipe 11 with the oil motor inlet pipe 12 and the oil motor outlet pipe 13. This design can discharge the oil motor out of the circulation of the flushing system, avoid the flushing oil carrying foreign matter into the oil motor and causing the oil motor failure, and ensure the safety of key components of the steam turbine control oil pipeline. At the same time, the filter component 6 cooperates with the oil supply component 2 to re-purify the flushed oil and return it for storage. This design can avoid the waste of flushing oil, improve the utilization rate of flushing oil, and reduce the flushing cost. At the same time, the pressure relief slow release component 8 will release the pressure of the flushing oil and then return it. This design can effectively reduce the impact force of the flushing oil on the oil supply component 2 and avoid damage to the oil supply component 2.

[0044] Example 2

[0045] On the basis of Example 1, the oil supply assembly 2 includes an oil pump 21, which is installed in the casing 1. The input end of the oil pump 21 is connected to the oil storage structure 3 through the oil inlet pipe 22, and the output end of the oil pump 21 is connected to the oil outlet pipe 23. The oil outlet pipe 23 is provided with a filter valve 24. The other end of the oil outlet pipe 23 is connected to the input end of the voltage stabilizing structure 4, and the output end of the voltage stabilizing structure 4 is connected to the connecting pipe 11. The connecting pipe 11 is respectively provided with an inlet valve 25 and an outlet valve 26.

[0046] The oil storage structure 3 includes an oil storage tank 31, an oil outlet 32 ​​and an oil return port 33 respectively penetrate and are connected to both sides of the oil storage tank 31, the oil outlet 32 ​​is flange-connected to the oil inlet pipe 22, the oil return port 33 is connected to the pressure relief slow release component 8, a refueling port 34 is provided on the top of the oil storage tank 31, the refueling port 34 penetrates and is connected to the casing 1, a cylindrical filter screen 35 is provided in the refueling port 34, an oil cap 36 is threadedly connected to the refueling port 34, three groups of L-shaped support seats 37 are arranged in a ring below the oil storage tank 31, a hydraulic support 38 is connected below the L-shaped support seat 37, and the hydraulic support 38 is bolted installed in the casing 1.

[0047] The pressure stabilizing structure 4 includes a pressure stabilizing three-way valve 41, the input end of the pressure stabilizing three-way valve 41 is flange-connected to the oil outlet pipe 23 through a one-way valve 42, the output end of the pressure stabilizing three-way valve 41 is flange-connected to the connecting pipe 11, an opening and closing valve 43 is threadedly connected to the top of the pressure stabilizing three-way valve 41, the opening and closing valve 43 is installed at the bottom of a pressure tank 44, the pressure tank 44 is fixed in the casing 1, an air bag 45 is arranged in the pressure tank 44, an inflation valve 46 is passed through and installed on the top of the pressure tank 44, and the inflation valve 46 is connected to the air bag 45.

[0048] The working principle and beneficial effects of the above technical solution are as follows: when the steam turbine control oil pipeline is flushed, the oil pump 21 is started, and the oil pump 21 draws the flushing oil from the oil storage tank 31 through the oil inlet pipe 22 and then pressurizes it into the oil outlet pipe 23. After the filter valve 24 on the oil outlet pipe 23 filters the flushing oil, the flushing oil flows through the pressure-stabilizing three-way valve 41, and then the flushing oil enters the steam turbine control oil pipeline through the connecting pipe 11. When the output of the oil pump 21 fluctuates and the output pressure exceeds the set pressure, the flushing oil opens the opening and closing valve 43, and part of the flushing oil flows into the pressure tank 44, and compresses the air in the airbag 45 under the action of pressure, so that the gas pressure in the airbag 45 increases, and the gas pressure and the flushing oil pressure are balanced. To achieve the absorption of excess pressure of the flushing oil, when the output of the oil pump 21 fluctuates and the output pressure is less than the set pressure, the airbag 45 expands under the pressure, the gas pressure and the flushing oil pressure are balanced, and the flushing oil in the pressure tank 44 is discharged into the pressure-stabilizing three-way valve 41 to compensate for the missing pressure of the flushing hydraulic oil. The inflation valve 46 on the top of the pressure tank 44 is used to fill the gas in the airbag 45, the L-shaped support seat 37 at the bottom of the oil storage tank 31 stabilizes the oil storage tank 31, the hydraulic support 38 is used to weigh the oil storage tank 31, the oil storage tank 31 is refueled through the top refueling port 34, the cylindrical filter 35 filters the added flushing oil, and the oil cap 36 protects the flushing oil in the oil storage tank 31;

[0049] The present invention realizes the pressurized output of flushing oil through the oil pump 21. This design can ensure the flushing force of the flushing oil on the steam turbine control oil pipeline, and uses the oil storage tank 31 to store the flushing oil, and cooperates with the hydraulic support 38 to weigh the oil storage tank 31. This design can dynamically sense the changes of the oil in the oil storage tank 31 at all times, and is convenient for timely filling of oil into the oil storage tank 31 to ensure sufficient supply of flushing oil. At the same time, the pressure stabilizing structure 4 uses the pressure tank 44 and the air bag 45 to absorb and compensate for the pressure fluctuations of the oil pump 21. This design can avoid the influence of the pressure fluctuations of the oil pump 21 on the flushing of the steam turbine control oil pipeline and ensure the constant pressure of the flushing oil.

[0050] Example 3

[0051] Based on Example 1, the connecting component 5 includes a connecting head 51, and the two connecting heads 51 are symmetrically flange-connected. The two connecting heads 51 are both threadedly connected with connecting sockets 52, and the connecting sockets 52 are respectively nested and connected to the connecting pipe 11, the oil motor inlet pipe 12, and the oil motor outlet pipe 13.

[0052] The beneficial effects of the above technical solution are: after the connecting socket 52 is inserted into the connecting pipe 11, the oil motor inlet pipe 12, and the oil motor outlet pipe 13, the connecting socket 52 is threadedly connected to the connecting head 51, thereby realizing the mutual connection between the connecting pipe 11, the oil motor inlet pipe 12, and the oil motor outlet pipe 13. The connection method of the present invention is a bolt connection, and there is no need to change the oil pipeline. There is a threaded hard seal between the connecting head 51 and the connecting socket 52. This sealing method is simple and reliable. Because there is no sealing component, the sealing failure will not be caused by aging of the sealing component.

[0053] Example 4

[0054] On the basis of Example 1, the filter assembly 6 includes a horizontal filter cartridge 61, an inlet pipe 62 and an outlet pipe 63 are provided at the bottom of the horizontal filter cartridge 61, the inlet pipe 62 and the connecting pipe 11 are flange-connected, the outlet pipe 63 is connected to the pressure relief slow release assembly 8, an open end cover 64 is flange-connected on one side of the horizontal filter cartridge 61, and a slag discharge structure 7 is flange-connected on the other side of the horizontal filter cartridge 61. A hollow partition 65 is provided in the horizontal filter cartridge 61, a primary cylindrical filter screen 66 is installed on the hollow partition 65, a secondary cylindrical filter screen 67 is installed on the other side of the hollow partition 65, and a filter screen plate 68 is connected to the other end of the secondary cylindrical filter screen 67.

[0055] The slag discharge structure 7 includes a rotating shaft 71, which passes through and is rotatably connected to the filter plate 68. A plurality of scrapers 72 are staggeredly installed on the rotating shaft 71. The scrapers 72 are slidably connected to the secondary cylindrical filter 67. An extrusion plate 73 is installed on the side of the rotating shaft 71 away from the filter plate 68. One end of the rotating shaft 71 is connected to an electric lead screw 74, and the electric lead screw 74 is threadedly connected in a threaded sleeve 75. The threaded sleeve 75 is fixedly connected to the slag discharge end cover 76. A slag discharge pipe 77 is provided at the bottom of the slag discharge end cover 76, and a pressure valve 78 is installed on the slag discharge pipe 77.

[0056] The beneficial effects of the above technical solution are as follows: after the flushing oil enters the horizontal filter cartridge 61 from the inlet pipe 62, the flushing oil is collected from the outside of the primary cylindrical filter screen 66 to the center to achieve primary filtration, and then the flushing oil passes through the hollow partition 65 and enters the secondary cylindrical filter screen 67, and the flushing oil diffuses from the center of the secondary cylindrical filter screen 67 to the outside to achieve secondary filtration, and finally the flushing oil flows out from the outlet pipe 63. When a lot of foreign matter is accumulated outside the primary cylindrical filter screen 66, the end cover 64 is opened to clean the primary cylindrical filter screen 66. When a lot of foreign matter is accumulated inside the secondary cylindrical filter screen 67, the electric screw 7 is started. 4. The electric lead screw 74 rotates around the threaded sleeve 75 and drives the rotating shaft 71 to rotate. The scraper head 72 on the rotating shaft 71 spirally advances around the secondary cylindrical filter 67 synchronously. The scraper head 72 scrapes off the foreign matter attached to the secondary cylindrical filter 67, and when the extrusion plate 73 moves, it squeezes the flushing oil so that part of it is collected at the slag discharge end cover 76. When the flushing oil is collected, the foreign matter is collected synchronously. The pressure at the slag discharge end cover 76 increases, and then the pressure valve 78 is opened under the action of pressure, and the flushing oil mixed with foreign matter is discharged from the slag discharge pipe 77. When the pressure drops, the pressure valve 78 is closed again;

[0057] The present invention utilizes a primary cylindrical filter 66 and a secondary cylindrical filter 67 to achieve graded filtration. This design can perform graded processing according to the size of foreign matter, thereby significantly improving the purity of the flushing oil and achieving deep purification of the flushing oil. The design of the scraper head 72 can automatically clean the secondary cylindrical filter 67, reducing the difficulty of maintenance of the secondary cylindrical filter 67. At the same time, the design of the slag discharge pipe 77 can prevent foreign matter from accumulating in the horizontal filter cartridge 61 and causing damage to the filter assembly 6.

[0058] Example 5

[0059] On the basis of Example 1, the pressure relief slow release assembly 8 includes a valve body 81, which is provided with a horizontal inlet 82 and a vertical outlet 83. The horizontal inlet 82 is flange-connected to the outlet pipe 63, and the vertical outlet 83 is flange-connected to the oil return port 33. A top plug 84 is provided in the valve body 81, and the top plug 84 is slidably connected in the sleeve 85. A compression elastic member 86 is provided between the top plug 84 and the sleeve 85. The top plug 84 cooperates with the horizontal inlet 82, and the sleeve 85 is installed on the overflow baffle 87, and the overflow baffle 87 is fixed on the valve body 81.

[0060] The beneficial effects of the above technical solution are as follows: when the flushing oil enters the horizontal inlet 82, the flushing oil squeezes the compression elastic member 86 under the action of pressure to push the top plug 84 open, and the flushing oil achieves a pressure drop, and then the flushing oil flows into the valve body 81 and gradually accumulates until it overflows from above the overflow baffle 87, and then the flushing oil falls back from the vertical outlet 83 into the oil storage tank 31;

[0061] The present invention utilizes the design of a compression elastic member 86 and an overflow baffle 87 to achieve pressure relief for the flushing oil. The design can reduce the pressure of the washing oil by elastic force, and then reduce the pressure again by gravity, ensuring that the pressure of the flushing oil drops to a minimum, thereby reducing the impact force when the flushing oil flows back to the oil storage tank 31, thereby avoiding damage to the oil storage tank 31.

[0062] Example 6

[0063] Based on Example 1, the filtering monitoring component includes a control module, a data processing module, a detection module and an execution module, and the detection module includes:

[0064] Flow rate sensor 1: used to detect the flow rate of the oil flowing into the inlet pipe 62 in the filter assembly 6, and is arranged in the inlet pipe 62;

[0065] Flow rate sensor 2: used to detect the flow rate of the oil flowing out of the outlet pipe 63 in the filter assembly 6, and is arranged in the outlet pipe 63;

[0066] Pressure sensor 1: used to detect the pressure of the oil flowing into the inlet pipe 62 in the filter assembly 6, and is arranged in the inlet pipe 62;

[0067] Pressure sensor 2: used to detect the pressure of the oil flowing out of the outlet pipe 63 in the filter assembly 6, and is arranged in the outlet pipe 63;

[0068] Timing sensor: used to detect the slag discharge interval of the filter assembly 6, which is arranged on the slag discharge end cover 76;

[0069] The detection module is electrically connected to the data processing module, the control module is electrically connected to the data processing module and the execution module, and the control module controls the execution module to work based on the data results of the data processing module.

[0070] The control module controls the execution module based on the data results of the data processing module, including the following steps:

[0071] Step 1: Calculate the filter cleaning factor F in the flushing system based on the detection values ​​of flow sensor 1, flow sensor 2, pressure sensor 1, pressure sensor 2 and timing sensor c :

[0072]

[0073] Among them: F c is the filter cleaning coefficient, t is the detection value of the timing sensor, E1 is the compensation coefficient of the primary cylindrical filter 66, P1 is the detection value of the pressure sensor 1, V1 is the detection value of the speed sensor 1, ε1 is the void ratio of the primary cylindrical filter 66, D1 is the hole diameter of the primary cylindrical filter 66, E2 is the compensation coefficient of the secondary cylindrical filter 67, P2 is the detection value of the pressure sensor 2, V2 is the detection value of the speed sensor 2, ε2 is the void ratio of the secondary cylindrical filter 67, and D2 is the hole diameter of the secondary cylindrical filter 67;

[0074] Step 2: Data processing module comparison F c and F c0 :

[0075] When F c ≥F c0 When based on F c Calculate the cleaning reciprocating times T of the filter assembly 6 c :

[0076] where F c0 is the filter cleaning coefficient reference value, T c is the cleaning reciprocating number of the filter assembly 6 (when T c When the calculated value is a decimal, T c Round up);

[0077] Step 3: The control module controls the execution module to start the filtering component 6 based on T c The secondary cylindrical filter screen 67 is cleaned reciprocatingly.

[0078] The beneficial effects of the above technical solution are as follows: when the secondary cylindrical filter 67 in the filter assembly filters the flushing oil, the filtering capacity of the secondary cylindrical filter 67 gradually decreases due to the gradual accumulation and clogging of foreign matter. However, due to the obstruction of the horizontal filter cartridge 61, people cannot intuitively understand the clogging condition of the secondary cylindrical filter 67, and cannot judge whether the secondary cylindrical filter 67 needs to be cleaned. However, when foreign matter accumulates on the secondary cylindrical filter 67, the flow rate and pressure of the flushing oil flowing into and out of the filter assembly 6 change. By monitoring the flow rate and pressure changes of the filter assembly 6, the clogging condition of the secondary cylindrical filter 67 can be judged, and then whether to clean and the number of cleaning times can be judged according to the clogging condition.

[0079] The present invention utilizes a control module, a data processing module, a detection module and an execution module to monitor the blockage of the secondary cylindrical filter. This design can ensure that the secondary cylindrical filter 67 can effectively filter the flushing oil, thereby avoiding blockage of the secondary cylindrical filter 67 due to accumulation of foreign matter, thereby affecting the reflux of the flushing oil.

[0080] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A flushing system for a steam turbine control oil pipeline, characterized in that: include: A casing (1) is provided with an oil supply assembly (2) in the casing (1); an inlet end of the oil supply assembly (2) is connected to an outlet end of a pressure relief slow-release assembly (8); an inlet end of the pressure relief slow-release assembly (8) is connected to an outlet end of a filter assembly (6); the outlet end of the oil supply assembly (2) and the inlet end of the filter assembly (6) are both connected to a connecting pipe (11); the connecting pipe (11) is respectively connected to an oil motor inlet pipe (12) and an oil motor outlet pipe (13) through a connecting assembly (5); It also includes a filtration monitoring component for monitoring the cleanliness of the filter screen of the filtration component (6).

2. A flushing system for a steam turbine control oil pipeline according to claim 1, characterized in that: The oil supply assembly (2) comprises an oil pump (21), which is installed in the casing (1). The input end of the oil pump (21) is connected to the oil storage structure (3) through an oil inlet pipe (22), and the output end of the oil pump (21) is connected to an oil outlet pipe (23). The oil outlet pipe (23) is provided with a filter valve (24). The other end of the oil outlet pipe (23) is connected to the input end of the pressure stabilizing structure (4). The output end of the pressure stabilizing structure (4) is connected to a connecting pipe (11), and the connecting pipe (11) is respectively provided with an inlet valve (25) and an outlet valve (26).

3. A flushing system for a steam turbine control oil pipeline according to claim 2, characterized in that: The oil storage structure (3) comprises an oil storage tank (31), an oil outlet (32) and an oil return port (33) respectively passing through and connected to both sides of the oil storage tank (31), the oil outlet (32) being flange-connected to the oil inlet pipe (22), the oil return port (33) being connected to the pressure relief slow release assembly (8), a refueling port (34) being provided at the top of the oil storage tank (31), the refueling port (34) passing through and connected to the casing (1), a cylindrical filter screen (35) being provided in the refueling port (34), an oil cap (36) being threadedly connected to the refueling port (34), three groups of L-shaped support seats (37) being arranged in a ring shape below the oil storage tank (31), a hydraulic support (38) being connected below the L-shaped support seat (37), and the hydraulic support (38) being bolted and installed in the casing (1).

4. A flushing system for a steam turbine control oil pipeline according to claim 2, characterized in that: The pressure stabilizing structure (4) comprises a pressure stabilizing three-way valve (41), the input end of the pressure stabilizing three-way valve (41) is connected to the flange of the oil outlet pipe (23) through a one-way valve (42), the output end of the pressure stabilizing three-way valve (41) is connected to the flange of the connecting pipe (11), the top of the pressure stabilizing three-way valve (41) is threadedly connected with an on-off valve (43), the on-off valve (43) is installed at the bottom of a pressure tank (44), the pressure tank (44) is fixed in the casing (1), an air bag (45) is arranged in the pressure tank (44), and an inflation valve (46) is penetrated and installed at the top of the pressure tank (44), and the inflation valve (46) is connected to the air bag (45).

5. A flushing system for a steam turbine control oil pipeline according to claim 1, characterized in that: The connection assembly (5) comprises a connection head (51), the two connection heads (51) are flange-connected symmetrically on the left and right, the two connection heads (51) are threadedly connected with a connection socket (52), and the connection socket (52) is respectively nested and connected to the ports of the connecting pipe (11), the oil motor inlet pipe (12) and the oil motor outlet pipe (13).

6. A flushing system for a steam turbine control oil pipeline according to claim 1, characterized in that: The filter assembly (6) comprises a horizontal filter cartridge (61). An inlet pipe (62) and an outlet pipe (63) are provided at the bottom of the horizontal filter cartridge (61). The inlet pipe (62) and the connecting pipe (11) are flange-connected. The outlet pipe (63) is connected to a pressure relief slow-release assembly (8). An open end cover (64) is flange-connected to one side of the horizontal filter cartridge (61). A slag discharge structure (7) is flange-connected to the other side of the horizontal filter cartridge (61). A hollow partition (65) is provided inside the horizontal filter cartridge (61). A primary cylindrical filter screen (66) is installed on the hollow partition (65). A secondary cylindrical filter screen (67) is installed on the other side of the hollow partition (65). A filter screen plate (68) is connected to the other end of the secondary cylindrical filter screen (67).

7. A flushing system for a steam turbine control oil pipeline according to claim 6, characterized in that: The slag discharge structure (7) comprises a rotating shaft (71), which penetrates through and is rotatably connected to the filter screen plate (68). A plurality of scrapers (72) are staggeredly mounted on the rotating shaft (71), and the scrapers (72) are slidably connected to the secondary cylindrical filter screen (67). A squeezing plate (73) is mounted on the side of the rotating shaft (71) away from the filter screen plate (68). One end of the rotating shaft (71) is connected to an electric lead screw (74), which is threadedly connected to a threaded sleeve (75). The threaded sleeve (75) is fixedly connected to a slag discharge end cover (76). A slag discharge pipe (77) is provided at the bottom of the slag discharge end cover (76), and a pressure valve (78) is mounted on the slag discharge pipe (77).

8. A flushing system for a steam turbine control oil pipeline according to claim 1, characterized in that: The pressure relief slow-release assembly (8) comprises a valve body (81), the valve body (81) is provided with a horizontal inlet (82) and a vertical outlet (83), the horizontal inlet (82) is flange-connected to the outlet pipe (63), the vertical outlet (83) is flange-connected to the oil return port (33), a top plug (84) is provided in the valve body (81), the top plug (84) is slidably connected in a sleeve (85), a compression elastic member (86) is provided between the top plug (84) and the sleeve (85), the top plug (84) and the horizontal inlet (82) cooperate with each other, the sleeve (85) is mounted on an overflow baffle (87), and the overflow baffle (87) is fixed on the valve body (81).

9. A flushing system for a steam turbine control oil pipeline according to claim 1, characterized in that: The filtering monitoring component includes a control module, a data processing module, a detection module and an execution module. The detection module includes: Flow rate sensor 1: used for detecting the flow rate of the oil flowing into the inlet pipe (62) from the filter assembly (6), and arranged in the inlet pipe (62); Flow rate sensor 2: used for detecting the flow rate of the oil flowing out of the outlet pipe (63) in the filter assembly (6), and arranged in the outlet pipe (63); Pressure sensor 1: used for detecting the pressure of the oil flowing into the inlet pipe (62) in the filter assembly (6), and arranged in the inlet pipe (62); Pressure sensor 2: used for detecting the pressure of the oil flowing out of the outlet pipe (63) in the filter assembly (6), and arranged in the outlet pipe (63); A timing sensor: used to detect the slag discharge interval of the filter assembly (6), and is arranged on the slag discharge end cover (76); The detection module is electrically connected to the data processing module, the control module is electrically connected to the data processing module and the execution module, and the control module controls the execution module to work based on the data results of the data processing module.

10. A flushing system for a steam turbine control oil pipeline according to claim 9, characterized in that: The control module controls the execution module based on the data results of the data processing module, including the following steps: Step 1: Calculate the filter cleaning factor F in the flushing system based on the detection values ​​of flow sensor 1, flow sensor 2, pressure sensor 1, pressure sensor 2 and timing sensor c : Among them: F c is the filter screen cleaning coefficient, t is the detection value of the timing sensor, E1 is the compensation coefficient of the primary cylindrical filter screen (66), P1 is the detection value of the pressure sensor 1, V1 is the detection value of the speed sensor 1, ε1 is the void ratio of the primary cylindrical filter screen (66), D1 is the hole diameter of the primary cylindrical filter screen (66), E2 is the compensation coefficient of the secondary cylindrical filter screen (67), P2 is the detection value of the pressure sensor 2, V2 is the detection value of the speed sensor 2, ε2 is the void ratio of the secondary cylindrical filter screen (67), and D2 is the hole diameter of the secondary cylindrical filter screen (67); Step 2: Data processing module comparison F c and F c0 : When F c ≥F c0 When based on F c Calculate the cleaning reciprocating times T of the filter assembly (6) c : where F c0 is the filter cleaning coefficient reference value, T c is the number of cleaning reciprocating times of the filter assembly (6); Step 3: The control module controls the execution module to start the filtering component (6) based on T c Clean the filter back and forth.

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