Multi-stage variable lubricating oil pump of gas turbine

Abstract

The utility model relates to a multistage variable lubricating oil pump of a gas turbine and belongs to the technical field of gas turbines. Comprising a shell used for being connected with a gas turbine, a pressurizing stage assembly used for sucking lubricating oil from an oil tank and pressurizing the lubricating oil and an oil return stage assembly used for pumping the lubricating oil flowing through all transmission parts of the gas turbine back to the oil tank are integrally arranged in the shell, and the pressurizing stage assembly and the oil return stage assembly are in transmission connection with a gas turbine accessory gearbox through a transmission shaft; the oil pumping supercharging device is simple in structure, achieves the oil pumping supercharging effect, and saves energy.

Description

Technical Field

[0001] The utility model relates to a multi-stage variable lubricating oil pump for a gas turbine, belonging to the technical field of gas turbines. Background Art

[0002] When the gas turbine is running, its transmission components and bearing cavities need to be lubricated and cooled with lubricating oil and sealed with air. The bearing cavity needs to be lubricated with high-pressure clean lubricating oil. At the same time, the lubricated lubricating oil needs to be pumped back to the oil tank for cooling and filtration.

[0003] A Chinese patent (CN106246351 B) discloses a lubricating oil pump for a gas turbine, and proposes a lubricating oil pump with a boosting stage and an oil return stage. However, the oil return stage mainly returns oil by pressure difference, has no oil pumping and boosting effect, and has a relatively complex structure. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a multi-stage variable lubricating oil pump for a gas turbine, which has a simple structure, realizes the oil pumping and pressurizing effect, and saves energy.

[0005] The utility model discloses a multi-stage variable lubricating oil pump for a gas turbine, comprising a housing for connecting to the gas turbine, a pressurizing stage assembly for sucking and pressurizing lubricating oil from an oil tank, and an oil return stage assembly for pumping the lubricating oil after passing through various transmission components of the gas turbine back to the oil tank, the pressurizing stage assembly and the oil return stage assembly are connected to the accessory gear box of the gas turbine through a transmission shaft;

[0006] The inlet of the boost stage assembly and the outlet of the oil return stage assembly are both connected to the oil tank via pipelines. A boost stage inlet and a boost stage outlet are provided on the shell corresponding to the boost stage assembly. A plurality of oil return pipelines connected to the inlet of the oil return stage assembly are also provided on the shell. The boost stage assembly includes a boost pump, and the oil return stage assembly includes several oil return pumps. Both the boost pump and the oil return pump are circular arc cycloid gear pumps.

[0007] The booster pump pumps the lubricating oil from the oil tank and pressurizes it before delivering it to the various lubrication chambers of the engine. The return oil pumps are connected to the corresponding bearing chambers of the engine and pump the lubricating oil in the bearing chambers back to the oil tank, achieving the oil pumping and pressurizing effect. By connecting to the engine accessory gearbox, the engine rotates to drive the booster pump and the return oil pump to rotate and pressurize, without the need for an additional power source, saving energy.

[0008] The circular arc pan-cycloid gear pump includes an inner rotor, a rotor shaft, an outer rotor and an eccentric housing. The inner rotor is mounted on the rotor shaft and meshes with the outer rotor. An eccentric housing is arranged outside the outer rotor. The outer rotor can rotate in the eccentric housing. The inner rotor and the outer rotor mesh to form an oil suction chamber and an oil discharge chamber.

[0009] When the inner rotor is driven by the driving device to rotate around the center, the outer rotor is driven to rotate in the same direction around another center. When the volume of the sealed working chamber gradually increases, the working chamber is connected to the inlet, a local negative oil pressure area is generated in the chamber, and the oil is sucked in through the inlet. The rotor continues to rotate, and when the seal working pressure changes from large to small, the working pressure is connected to the outlet, and the internal working fluid is pressed out through the outlet, thereby realizing the process of pump oil suction and pressurization.

[0010] The number of teeth of the outer rotor is greater than the number of teeth of the inner rotor.

[0011] A temperature sensor is installed in the oil return pipeline. The temperature sensor is used to detect the oil return temperature of the lubricating oil to prevent the lubricating oil temperature from being too high.

[0012] The booster pump and the oil return pump are both provided with safety valves. When the pressure increases due to pipeline blockage or the like, the pressure overflows through the safety valves without causing damage to the booster pump and the oil return pump.

[0013] A filter screen and an oil supply pressure limiting valve are arranged at the inlet of the oil return pump.

[0014] A magnetic chip detector is arranged below the filter screen and is connected to a control system for detecting the content of metal chips in the lubricating oil and alarming when the metal chips accumulate to a certain amount.

[0015] The outer peripheries of the transmission shaft, the rotor shaft and the two ends of the engine accessory gearbox are all provided with splines, and the transmission reliability is improved through the spline connection.

[0016] An oil-gas separator pump is also arranged in the housing, and the oil-gas separator pump is connected to the outlet of the oil return pump. The recovered oil is separated into oil and gas by the oil-gas separator pump and then recovered to the oil tank.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] (1) The utility model provides a booster pump to pump out lubricating oil from the oil tank and pressurize it before delivering it to each lubrication chamber of the engine. The utility model also provides an oil return pump to connect to the corresponding bearing chambers of the engine to pump the lubricating oil in the bearing chamber back to the oil tank, thereby achieving the oil pumping and pressurization effect. By connecting to the engine accessory gearbox, the engine rotates to drive the booster pump and the oil return pump to rotate and pressurize, without the need for an additional power source, thus saving energy.

[0019] (2) The circular arc pan-cycloid gear pump includes an inner rotor, a rotor shaft, an outer rotor and an eccentric housing. The inner rotor is mounted on the rotor shaft and meshes with the outer rotor. An eccentric housing is arranged outside the outer rotor. The outer rotor can rotate in the eccentric housing. The inner rotor and the outer rotor mesh to form an oil suction chamber and an oil discharge chamber.

[0020] When the inner rotor is driven by the driving device to rotate around the center, the outer rotor is driven to rotate in the same direction around another center. When the volume of the sealed working chamber gradually increases, the working chamber is connected to the inlet, a local negative oil pressure area is generated in the chamber, and the oil is sucked in through the inlet. The rotor continues to rotate, and when the seal working pressure changes from large to small, the working pressure is connected to the outlet, and the internal working fluid is pressed out through the outlet, thereby realizing the process of pump oil suction and pressurization.

[0021] (3) A magnetic chip detector is installed under the filter. The magnetic chip detector is connected to the control system and is used to detect the metal chip content in the lubricating oil. When the metal chips accumulate to a certain amount, an alarm is triggered. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of embodiment 1 of the utility model;

[0023] Figure 2 This is a schematic diagram of the working principle of Embodiment 1 of the utility model;

[0024] Figure 3 It is a schematic diagram of the working principle of circular arc pan-cycloid gear.

[0025] In the figure: 1. oil return pipeline; 2. boost stage outlet; 3. housing; 4. transmission shaft; 5. filter; 6. accessory gearbox oil return line; 7. safety valve; 8. boost stage inlet; 9. oil-gas separator pump oil return line; 10. oil return pump; 11. gas turbine accessory gearbox oil return pump; 12. boost pump; 13. oil-gas separator pump; 14. oil outlet chamber; 15. oil suction chamber; 16. eccentric housing; 17. inner rotor; 18. outer rotor; 19. rotor shaft. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with embodiments:

[0027] Example 1

[0028] like Figure 1 to Figure 3 As shown, a multi-stage variable lubricating oil pump for a gas turbine described in the utility model comprises a housing 3 for connecting to the gas turbine, a pressurizing stage assembly for sucking out the lubricating oil from the oil tank and pressurizing the lubricating oil, and an oil return stage assembly for pumping the lubricating oil after passing through various transmission components of the gas turbine back to the oil tank are integrated in the housing 3, the pressurizing stage assembly and the oil return stage assembly are transmission-connected to the accessory gearbox of the gas turbine through a transmission shaft 4, a fuel engine accessory gearbox oil return pump 11 is also arranged in the housing 3, and an accessory gearbox oil return path 6 is arranged on the housing 3 corresponding to the fuel engine accessory gearbox oil return pump 11;

[0029] The inlet of the boost stage assembly and the outlet of the oil return stage assembly are both connected to the oil tank via pipelines. A boost stage inlet 8 and a boost stage outlet 2 are provided on the shell 3 corresponding to the boost stage assembly. A plurality of oil return pipelines 1 connected to the inlet of the oil return stage assembly are also provided on the shell 3. The boost stage assembly includes a boost pump 12, and the oil return stage assembly includes four oil return pumps 10. The inlet of the oil return pump 10 is connected to the corresponding bearing cavity of the engine through a pipeline, and the outlet of the oil return pump 10 is connected to the oil tank through a pipeline. Both the boost pump 12 and the oil return pump 10 are circular arc cycloid gear pumps. The boost pump 12 pumps the lubricating oil out of the oil tank and pressurizes it before transporting it to the various lubrication cavities of the engine. The oil return pumps 10 are respectively connected to the corresponding bearing cavities of the engine to pump the lubricating oil in the bearing cavity back to the oil tank, thereby achieving the oil pumping and pressurizing effect. The flow direction of the lubricating oil is as follows: Figure 2 Indicated by the arrow.

[0030] The circular arc cycloidal gear pump includes an inner rotor 17, a rotor shaft 19, an outer rotor 18 and an eccentric housing 16. The inner rotor 17 is mounted on the rotor shaft 19 and meshes with the outer rotor 18. An eccentric housing 16 is arranged outside the outer rotor 18. The outer rotor 18 can rotate in the eccentric housing 16. The inner rotor 17 and the outer rotor 18 mesh to form an oil suction chamber 15 and an oil discharge chamber 14. When the inner rotor 17 is driven by the driving device to rotate around the center, the outer rotor 18 is driven to rotate in the same direction around another center. When the volume of the sealed working chamber gradually increases, the working chamber is connected to the inlet, and a local negative oil pressure area is generated in the chamber, and the oil is sucked in through the inlet. The rotor continues to rotate, and when the sealing work changes from large to small, the work is connected to the outlet, and the internal working fluid is pressed out through the outlet, thereby realizing the process of pumping oil and pressing oil. The rotation direction of the circular arc cycloidal gear pump is as follows: Figure 3 Indicated by the arrow.

[0031] The number of teeth of the outer rotor 18 is greater than that of the inner rotor 17, and the difference in the number of teeth is 1.

[0032] A temperature sensor is installed in the oil return line 1.

[0033] The boost pump 12 and the oil return pump 10 are both provided with a safety valve 7 .

[0034] A filter screen 5 and an oil supply pressure limiting valve are provided at the inlet of the return oil pump 10.

[0035] A magnetic chip detector is arranged below the filter screen 5 .

[0036] The outer peripheries of the transmission shaft 4, the rotor shaft 19 and both ends of the engine accessory gearbox are provided with splines. The transmission shaft 4 is the main part for transmitting power, and both ends are machined with external splines. The spline at the left end of the transmission shaft 4 is connected to the inner spline of the transmission gear, and the spline on the right end is connected to the spline of the external engine accessory gearbox.

[0037] An oil-gas separator pump 13 is also arranged in the housing 3 , and the oil-gas separator pump oil return passage 9 is connected to the outlet of the oil return pump 10 .

[0038] At present, the product has been applied to TG30 gas turbines and has been running with the gas turbine for more than 2,000 hours. The return oil temperature of each bearing cavity is normal, and the bearing lubrication is normal. According to the different flow and boost requirements of different oil return stages and boost stages, the number and specifications of the selected pan-cycloid pumps are also different.

[0039] The specific flow parameters of the booster pump 12, the oil return pump 10, the accessory gearbox and the oil-gas separator pump 13 meet the requirements of the following table:

[0040]

[0041] The description of the direction and relative position relationship of the structure in the present invention, such as the description of front, back, left, right, up, and down, does not constitute a limitation of the present invention, but is only for the convenience of description.

Claims

1. A multi-stage variable lubricating oil pump for a gas turbine, characterized in that: It comprises a casing (3) for connecting to a gas turbine, wherein a pressure-increasing stage assembly for sucking out lubricating oil from an oil tank and pressurizing the lubricating oil, and an oil return stage assembly for pumping the lubricating oil after passing through various transmission components of the gas turbine back to the oil tank are integrated in the casing (3), and the pressure-increasing stage assembly and the oil return stage assembly are transmission-connected to a gearbox for accessories of the gas turbine via a transmission shaft (4); The inlet of the booster stage assembly and the outlet of the oil return stage assembly are both connected to the oil tank via pipelines; a booster stage inlet (8) and a booster stage outlet (2) are provided on the housing (3) corresponding to the booster stage assembly; a plurality of oil return pipelines (1) connected to the inlet of the oil return stage assembly are also provided on the housing (3); the booster stage assembly comprises a booster pump (12); the oil return stage assembly comprises a plurality of oil return pumps (10); and both the booster pump (12) and the oil return pump (10) are circular arc cycloidal gear pumps.

2. The multi-stage variable lubricating oil pump for a gas turbine according to claim 1, characterized in that: The circular arc pan-cycloid gear pump comprises an inner rotor (17), a rotor shaft (19), an outer rotor (18) and an eccentric housing (16). The inner rotor (17) is mounted on the rotor shaft (19) and meshes with the outer rotor (18). An eccentric housing (16) is arranged outside the outer rotor (18). The outer rotor (18) can rotate in the eccentric housing (16). The inner rotor (17) and the outer rotor (18) mesh to form an oil suction chamber (15) and an oil discharge chamber (14).

3. The multi-stage variable lubricating oil pump for a gas turbine according to claim 2, characterized in that: The number of teeth of the outer rotor (18) is greater than the number of teeth of the inner rotor (17).

4. The multi-stage variable lubricating oil pump for a gas turbine according to claim 3, characterized in that: A temperature sensor is installed in the oil return line (1).

5. The multi-stage variable lubricating oil pump for a gas turbine according to claim 4, characterized in that: The booster pump (12) and the oil return pump (10) are both provided with a safety valve (7).

6. The multi-stage variable lubricating oil pump for a gas turbine according to claim 5, characterized in that: A filter screen (5) and an oil supply pressure limiting valve are arranged at the inlet of the oil return pump (10).

7. The multi-stage variable lubricating oil pump for a gas turbine according to claim 6, characterized in that: A magnetic chip detector is arranged below the filter screen (5).

8. The multi-stage variable lubricating oil pump for a gas turbine according to claim 7, characterized in that: The outer circumferences of the transmission shaft (4), the rotor shaft (19) and both ends of the combustion engine accessory gearbox shaft are all connected via splines.

9. The gas turbine multi-stage variable lubricating oil pump according to any one of claims 1 to 8, characterized in that: An oil-gas separator pump (13) is also arranged in the housing (3), and the oil-gas separator pump (13) is connected to the outlet of the oil return pump (10).

Images