Novel special oil pump structure for steam turbine

Abstract

The utility model relates to the technical field of oil pumps, in particular to a novel special oil pump structure for a steam turbine, which comprises a motor and a mounting plate, the motor is mounted above the mounting plate, a supporting column is mounted on the lower surface of the mounting plate, a pump cover is mounted on the lower surface of the supporting column, and a shell is mounted on the lower surface of the pump cover. A filter screen is installed on the lower surface of the shell, a first bent pipe is fixedly connected to the surface of the supporting column, a ball valve is fixedly connected to one end of the first bent pipe, a second bent pipe is fixedly connected to one side of the shell, a straight pipe is fixedly connected to the inner wall of the mounting plate, and a check valve is fixedly connected between the second bent pipe and the straight pipe. According to the scheme, the adaptability of the oil pump can be improved, the probability that the oil pump is abnormal in the working process is reduced, the oil pump can independently supply lubricating oil, the use cost of equipment is reduced, popularization and use are convenient, the scheme can be applied to a steam turbine, and meanwhile the oil pump can replace an inlet.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pumps, in particular to a novel special oil pump structure for steam turbines. 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 with the blade rows to rotate and perform work externally. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship power plants. With the development of society, steam turbines often require oil pumps to supply lubricating oil during use.

[0003] The inventor found in daily work that most existing oil pumps have negative pressure at the inlet. Once air leaks in, the oil pump will malfunction. Therefore, a special oiler must be used to supply oil to the oil pump to ensure the reliability and stability of the oil pump, which increases the cost of equipment use. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that most oil pump inlets in the prior art are negative pressure, and once air leaks in, the oil pump will malfunction. Therefore, a special oil injector must be used to supply oil to the oil pump to ensure the reliability and stability of the oil pump, which increases the cost of equipment use. A new type of steam turbine special oil pump structure is proposed to solve the problem that the oil pump inlet is negative pressure, and once air leaks in, the oil pump will malfunction. Therefore, a special oil injector must be used to supply oil to the oil pump to ensure the reliability and stability of the oil pump, which increases the cost of equipment use.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a new type of special oil pump structure for steam turbine, including a motor and a mounting plate, the motor is installed above the mounting plate, a supporting column is installed on the lower surface of the mounting plate, a pump cover is installed on the lower surface of the supporting column, a shell is installed on the lower surface of the pump cover, a filter is installed on the lower surface of the shell, a first elbow is fixedly connected to the surface of the supporting column, and a ball valve is fixedly connected to one end of the first elbow. This scheme can improve the adaptability of the oil pump, reduce the probability of malfunction of the oil pump during operation, so that the oil pump can perform lubricating oil supply operation alone, reduce the use cost of the equipment, and facilitate popular use.

[0006] Preferably, a second curved pipe is fixedly connected to one side of the shell, a straight pipe is fixedly connected to the inner wall of the mounting plate, and a check valve is fixedly connected between the second curved pipe and the straight pipe.

[0007] Preferably, an air pipe is fixedly connected to the surface of the second elbow, a pressure gauge joint is fixedly connected to the inner wall of the mounting plate, and one end of the air pipe is connected to the pressure gauge joint to facilitate detection of the internal pressure of the second elbow.

[0008] Preferably, the inner wall of the support column is fixedly connected to a bearing seat, the inner wall of the bearing seat is installed with a double-row bearing, a round nut is threadedly connected to the double-row bearing, the inside of the double-row bearing is rotatably connected to a transmission shaft, a sleeve is installed inside the bearing seat, and a bearing end cover is installed on the bearing seat.

[0009] Preferably, a coupling is installed at the driving end of the motor, and one end of the transmission shaft is installed inside the coupling, so that the power of the motor is effectively transmitted to the transmission shaft through the coupling.

[0010] Preferably, an axis-connected sliding shaft is installed inside the pump cover, one end of the transmission shaft passes through the axis-connected sliding shaft, an impeller is installed on the transmission shaft, a spherical gasket is sleeved on the transmission shaft, and a cap nut is threadedly connected on the transmission shaft. When the impeller of the pump rotates, the lubricating oil is sucked into the pump. At this time, a low-pressure area is formed at the inlet of the pump, and the lubricating oil will automatically flow into this low-pressure area.

[0011] Preferably, a sliding bearing is installed inside the housing, and one end of the impeller is inserted into the sliding bearing to facilitate the rotation of the impeller.

[0012] Compared with the prior art, the advantages and positive effects of the utility model are:

[0013] 1. In the utility model, the working principle of the steam turbine oil pump is to use the centrifugal force generated by the rotation of the pump impeller to suck the lubricating oil into the pump, and then send the lubricating oil to various parts of the steam turbine through the pump outlet. When the pump impeller rotates, the lubricating oil is sucked into the pump. At this time, a low-pressure area is formed at the inlet of the pump, and the lubricating oil will automatically flow into this low-pressure area. After the lubricating oil is sucked into the pump, the pump impeller will push the lubricating oil to the outlet of the pump. At this time, the lubricating oil is compressed and forms a high-pressure area, so that it can flow smoothly to various parts of the steam turbine. After the lubricating oil flows to various parts of the steam turbine, a low-pressure area will be formed at the outlet of the pump, so that the lubricating oil can automatically flow back to the inlet of the pump, thereby forming a cycle. This scheme can improve the adaptability of the oil pump, reduce the probability of malfunction of the oil pump during operation, so that the oil pump can perform lubricating oil supply operation alone, reduce the use cost of the equipment, and facilitate popularization. This scheme can be applied to steam turbines, and the oil pump can replace imports. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A three-dimensional structural diagram of a novel special oil pump structure for steam turbine is proposed for the utility model;

[0015] Figure 2 The utility model provides a cross-sectional structural schematic diagram of a novel special oil pump structure for steam turbine;

[0016] Figure 3This utility model proposes a new type of steam turbine special oil pump structure Figure 2 A schematic diagram of the structure at A;

[0017] Figure 4 This utility model proposes a new type of steam turbine special oil pump structure Figure 2 Schematic diagram of the structure at point B.

[0018] Legend:

[0019] 1. Motor; 2. Ball valve; 3. First elbow; 4. Filter; 5. Support column; 6. Mounting plate; 7. Second elbow; 8. Check valve; 9. Straight pipe; 10. Air pipe; 11. Pressure gauge joint; 12. Coupling; 13. Drive shaft; 14. Pump cover; 15. Impeller; 16. Housing; 17. Sliding bearing; 18. Cap nut; 19. Spherical gasket; 20. Shaft connecting sliding shaft; 21. Bearing end cover; 22. Sleeve; 23. Double row bearing; 24. Bearing seat; 25. Round nut. DETAILED DESCRIPTION

[0020] See also Figure 1-4 The utility model provides a technical solution: a new type of special oil pump structure for steam turbine, including a motor 1 and a mounting plate 6, the motor 1 is installed above the mounting plate 6, a supporting column 5 is installed on the lower surface of the mounting plate 6, a pump cover 14 is installed on the lower surface of the supporting column 5, a shell 16 is installed on the lower surface of the pump cover 14, a filter screen 4 is installed on the lower surface of the shell 16, a first elbow 3 is fixedly connected to the surface of the supporting column 5, and a ball valve 2 is fixedly connected to one end of the first elbow 3. This solution can improve the adaptability of the oil pump, reduce the probability of malfunction of the oil pump during operation, so that the oil pump can perform lubricating oil supply operation alone, reduce the use cost of the equipment, and facilitate popularization.

[0021] Specifically, a second curved pipe 7 is fixedly connected to one side of the housing 16 , a straight pipe 9 is fixedly connected to the inner wall of the mounting plate 6 , and a check valve 8 is fixedly connected between the second curved pipe 7 and the straight pipe 9 .

[0022] In this embodiment: an air pipe 10 is fixedly connected to the surface of the second curved pipe 7, a pressure gauge connector 11 is fixedly connected to the inner wall of the mounting plate 6, and one end of the air pipe 10 is connected to the pressure gauge connector 11, so as to detect the internal pressure of the second curved pipe 7.

[0023] Specifically, the inner wall of the support column 5 is fixedly connected to a bearing seat 24, the inner wall of the bearing seat 24 is installed with a double-row bearing 23, the double-row bearing 23 is threadedly connected with a round nut 25, the inside of the double-row bearing 23 is rotatably connected to the transmission shaft 13, the inside of the bearing seat 24 is installed with a sleeve 22, and the bearing end cover 21 is installed on the bearing seat 24.

[0024] Specifically, a coupling 12 is installed at the driving end of the motor 1 , and one end of the transmission shaft 13 is installed inside the coupling 12 , so that the power of the motor 1 is effectively transmitted to the transmission shaft 13 through the coupling 12 .

[0025] In this embodiment: an axially connected sliding shaft 20 is installed inside the pump cover 14, one end of the transmission shaft 13 passes through the axially connected sliding shaft 20, an impeller 15 is installed on the transmission shaft 13, a spherical gasket 19 is sleeved on the transmission shaft 13, and a cap nut 18 is threadedly connected to the transmission shaft 13. When the impeller 15 of the pump rotates, the lubricating oil is sucked into the pump. At this time, a low-pressure area is formed at the inlet of the pump, and the lubricating oil will automatically flow into this low-pressure area.

[0026] Specifically, a sliding bearing 17 is installed inside the housing 16 , and one end of the impeller 15 is inserted into the sliding bearing 17 to facilitate the rotation of the impeller 15 .

[0027] Working principle: The working principle of the turbine oil pump is to use the centrifugal force generated by the rotation of the pump impeller 15 to suck the lubricating oil into the pump, and then send the lubricating oil to various parts of the turbine through the pump outlet. When the pump impeller 15 rotates, the lubricating oil is sucked into the pump. At this time, a low-pressure area is formed at the inlet of the pump, and the lubricating oil will automatically flow into this low-pressure area. After the lubricating oil is sucked into the pump, the pump impeller 15 will push the lubricating oil to the outlet of the pump. At this time, the lubricating oil is compressed and forms a high-pressure area, so that it can flow smoothly to various parts of the turbine. After the lubricating oil flows to various parts of the turbine, a low-pressure area will be formed at the outlet of the pump, so that the lubricating oil can automatically flow back to the inlet of the pump, thereby forming a cycle. This scheme can improve the adaptability of the oil pump, reduce the probability of malfunction of the oil pump during operation, and enable the oil pump to perform lubricating oil supply operations alone, reduce the use cost of the equipment, and facilitate popularization.

Claims

1. A novel special oil pump structure for steam turbine, comprising a motor (1) and a mounting plate (6), characterized in that: The motor (1) is mounted above a mounting plate (6); a support column (5) is mounted on the lower surface of the mounting plate (6); a pump cover (14) is mounted on the lower surface of the support column (5); a housing (16) is mounted on the lower surface of the pump cover (14); a filter screen (4) is mounted on the lower surface of the housing (16); a first elbow (3) is fixedly connected to the surface of the support column (5); a ball valve (2) is fixedly connected to one end of the first elbow (3); and a filter screen (4) is mounted on the lower surface of the housing (16). A second curved pipe (7) is fixedly connected to one side, a straight pipe (9) is fixedly connected to the inner wall of the mounting plate (6), a check valve (8) is fixedly connected between the second curved pipe (7) and the straight pipe (9), an air pipe (10) is fixedly connected to the surface of the second curved pipe (7), a pressure gauge connector (11) is fixedly connected to the inner wall of the mounting plate (6), one end of the air pipe (10) is connected to the pressure gauge connector (11), and a bearing seat (24) is fixedly connected to the inner wall of the support column (5). A double-row bearing (23) is installed on the inner wall of the bearing seat (24), a round nut (25) is threadedly connected to the double-row bearing (23), a transmission shaft (13) is rotatably connected inside the double-row bearing (23), a sleeve (22) is installed inside the bearing seat (24), a bearing end cover (21) is installed on the bearing seat (24), a coupling (12) is installed at the driving end of the motor (1), and one end of the transmission shaft (13) is installed inside the coupling (12). The pump cover (14) is provided with an axially connected sliding shaft (20) installed inside, one end of the transmission shaft (13) passes through the axially connected sliding shaft (20), an impeller (15) is installed on the transmission shaft (13), a spherical gasket (19) is sleeved on the transmission shaft (13), a cap nut (18) is threadedly connected to the transmission shaft (13), a sliding bearing (17) is installed inside the housing (16), and one end of the impeller (15) is inserted into the sliding bearing (17).

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