Vacuum-pumping system for sealing oil of generator

Abstract

The utility model discloses a generator sealing oil vacuumizing system which comprises a vacuum oil tank, an oil-gas separator, a vacuum pump and a first oil return pipeline, and the vacuum oil tank is communicated with a generator through a circulation loop; the oil-gas separator is communicated with an exhaust port of the vacuum oil tank through an exhaust pipeline; the vacuum pump is communicated with an exhaust hole of the oil-gas separator through an air suction pipe; one end of the first oil return pipeline is communicated with the bottom of the oil-gas separator, and the other end of the first oil return pipeline is communicated with the vacuum oil tank; and the oil-gas separator is higher than the vacuum oil tank. According to the sealing oil vacuumizing system of the generator, the stability of the vacuum degree in the vacuum oil tank is guaranteed, and the oil-gas separation efficiency in the vacuum oil tank is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of generators, in particular to a generator sealing oil vacuum pumping system. Background Art

[0002] Hydrogen has the advantages of good thermal conductivity, low specific gravity, and high cooling efficiency, and is widely used in the cooling system of generators in power generation companies. Hydrogen is the lightest known gas and is very easy to diffuse in the air. Using hydrogen as the cooling medium for generators can greatly reduce wind loss during the operation of the generator. It has a fast diffusion speed and higher heat transfer efficiency. Therefore, large generator sets generally choose hydrogen as the cooling medium for the unit.

[0003] In the system using hydrogen as the cooling medium of the generator, in order to prevent the hydrogen in the generator from leaking outward along the gap between the rotating shaft and the sealing shoe, the generator uses a sealing oil system. In order to prevent the leakage of hydrogen inside the generator, prevent air and moisture from entering the generator, and keep the generator winding dry, the lubricating oil in the sealing oil system is provided by the lubricating oil of the steam turbine. Since the lubricating oil is in contact with the air during operation, it is inevitable that the oil contains air and moisture. In order to prevent the air and moisture in the oil from contaminating the hydrogen in the generator, the sealing oil needs to be purified to remove the air and moisture in the oil. The sealing oil system provides lubricating oil to the generator sealing shoe for sealing, preventing the atmosphere and the gas in the sealing oil from contaminating the hydrogen in the generator.

[0004] Reference to the sealing oil vacuum system in the prior art Figure 1As shown, it includes a vacuum pump 03 and a vacuum oil tank 01 connected by a vacuum pipeline, and an oil-gas separation device 02 is installed on the vacuum pipeline. The oil-gas separation device 02 is used to drain the separated oil in the vacuum oil tank 01 to prevent excessive oil from entering the vacuum pump 03 and affecting the stable operation of the vacuum pump 03. A liquid level sensor 04 and an oil drain valve 05 are provided on the oil-gas separation device 02. When the liquid level sensor 04 detects that the liquid level in the oil-gas separation device 02 rises to a set value, the solenoid valve 06 provided on the pipeline connecting the oil-gas separation device 02 and the vacuum oil tank 01 is automatically closed, and the vacuum pump 03 stops working. The on-site operator opens the oil drain valve 05, and after the liquid in the oil-gas separation device 02 is discharged, the solenoid valve 06 automatically opens, and the vacuum pump 03 is started and the pump group is restored to operation. During the shutdown period of the vacuum pump 03, the vacuum pressure in the upstream vacuum oil tank 01 is affected, thereby affecting the oil-gas separation efficiency in the vacuum oil tank 01. When the liquid level in the oil-gas separation device 02 reaches the set value, the vacuum pump 03 needs to be stopped and the oil needs to be drained on site. Frequent shutdown of the vacuum pump 03 not only increases the workload of the operation and maintenance personnel, but also reduces the vacuum degree in the vacuum oil tank 01, thereby affecting the oil-gas separation efficiency of the sealing oil. The high gas content in the sealing oil further affects the purity of the hydrogen in the generator, which has a great impact on the safe operation of the generator. Utility Model Content

[0005] In view of this, the utility model provides a generator sealing oil vacuum pumping system, which ensures the stability of the vacuum degree in the vacuum oil tank and improves the oil-gas separation efficiency in the vacuum oil tank.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A generator sealing oil vacuum pumping system, comprising:

[0008] A vacuum oil tank connected to the generator through a circulation loop;

[0009] An oil-gas separator is connected to the exhaust port of the vacuum oil tank through an exhaust pipeline;

[0010] A vacuum pump connected to the exhaust hole of the oil-gas separator through an air suction pipe;

[0011] a first oil return pipeline, one end of which is connected to the bottom of the oil-gas separator, and the other end of which is connected to the vacuum oil tank;

[0012] The height of the oil-gas separator is higher than the height of the vacuum oil tank.

[0013] Optionally, a separation filter is provided in the oil-gas separator, and the separation filter separates the oil inlet and the exhaust hole of the oil-gas separator, thereby forming a first chamber close to the oil inlet of the oil-gas separator and a second chamber close to the exhaust hole of the oil-gas separator;

[0014] The first chamber is in communication with the first oil return pipeline through a first oil return branch, and the second chamber is in communication with the first oil return pipeline through a second oil return branch.

[0015] Optionally, a U-shaped pipe section is provided on the second oil return branch, and the U-shaped pipe section is arranged near the position where the second oil return branch connects to the first oil return pipeline, and the height of the U-shaped pipe section is lower than the height of the connecting port between the second oil return branch and the first oil return pipeline.

[0016] Optionally, one end of the first oil return pipeline is connected to the first oil return branch and the second oil return branch, and the other end is connected to a drain pipe, and the drain pipe is connected to the bottom of the vacuum oil tank. An oil drain isolation valve is provided at a position of the drain pipe away from the vacuum oil tank and the first oil return pipeline.

[0017] Optionally, an inclined pipe section is provided on the air extraction pipeline, the slope of the inclined pipe section is not less than 2%, and the height of the inclined pipe section gradually increases from an end close to the vacuum oil tank to an end away from the vacuum oil tank.

[0018] Optionally, the circulation loop includes an oil supply pipe and a second oil return pipe connected to the vacuum oil tank, the pipe outlet height of the second oil return pipe is higher than the oil level in the vacuum oil tank, and the pipe outlet of the second oil return pipe is provided with a first nozzle.

[0019] Optionally, an oil replenishing pipe and an oil draining pipe are provided on the vacuum oil tank, the outlet height of the oil replenishing pipe is higher than the oil level in the vacuum oil tank, and the outlet of the oil replenishing pipe is provided with a second nozzle.

[0020] Optionally, the height of the U-shaped pipe section is 300-600 mm.

[0021] Optionally, an oil return isolation valve is provided on the first oil return pipeline;

[0022] The suction pipe is provided with a vacuum pump isolation valve.

[0023] Optionally, the height of the oil inlet of the oil-gas separator is lower than the height of the exhaust hole of the oil-gas separator.

[0024] It can be seen from the above technical scheme that the generator sealing oil vacuum pumping system provided by the utility model connects the bottom of the oil-gas separator with the vacuum oil tank by setting a first oil return pipeline. At the same time, the setting height of the oil-gas separator is higher than the height of the vacuum oil tank, so that the oil in the oil-gas separator flows into the vacuum oil tank along the first oil return pipeline under the action of gravity, and the separated oil automatically flows back to the vacuum oil tank. During the operation of the system, there is no need to stop the vacuum pump to drain the oil, which avoids the change of vacuum pressure in the vacuum oil tank caused by the shutdown of the vacuum pump in the prior art, ensures the stability of the vacuum degree in the vacuum oil tank, thereby improving the oil-gas separation efficiency in the vacuum oil tank, thereby ensuring the normal discharge of oil and gas in the sealing oil in the vacuum oil tank, ensuring that the gas content in the circulating sealing oil is low, and ensuring the purity of the hydrogen in the generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of a sealing oil vacuum pumping system in the prior art;

[0027] Figure 2 A schematic diagram of the structure of a generator sealing oil vacuum pumping system provided by an embodiment of the utility model;

[0028] Figure 3 A simplified structural diagram of a generator sealing oil vacuum pumping system provided by an embodiment of the utility model;

[0029] Figure 4 A schematic diagram of the structure of an oil-gas separator provided in an embodiment of the utility model;

[0030] Figure 5 A schematic diagram of the connecting pipeline structure between the oil-gas separator and the vacuum oil tank provided in the embodiment of the utility model;

[0031] Figure 6 A schematic structural diagram of a vacuum oil tank provided in an embodiment of the utility model.

[0032] in:

[0033] 01. Vacuum oil tank, 02. Oil-gas separation device, 03. Vacuum pump, 04. Liquid level sensor, 05. Oil drain valve, 06. Solenoid valve,

[0034] 1. Vacuum oil tank, 2. Air extraction pipeline, 201. Inclined pipe section, 3. Oil-gas separator, 301. First chamber, 302. Second chamber, 4. Vacuum pump isolation valve, 5. First vacuum breaking valve, 6. Exhaust pipe, 7. Vacuum pump, 8. Return oil isolation valve, 9. First return oil pipeline, 10. Drain oil isolation valve, 11. Drain pipe, 12. Second return oil pipeline, 13. Oil supply pipe, 14. Oil replenishment pipe, 15. Drain oil pipe, 16. Second vacuum breaking valve, 17. Separation filter, 18. Liquid level sensor, 19. Second return oil branch, 1901. U-shaped pipe section, 20. First return oil branch, 21. Valve, 22. Second nozzle, 23. First nozzle, 24. Suction pipe. DETAILED DESCRIPTION

[0035] The utility model discloses a generator sealing oil vacuum pumping system, which ensures the stability of the vacuum degree in a vacuum oil tank and improves the oil-gas separation efficiency in the vacuum oil tank.

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] See also Figures 2 to 6 The utility model discloses a generator sealing oil vacuum pumping system, comprising a vacuum oil tank 1, an oil-gas separator 3, a vacuum pump 7 and a first oil return pipeline 9. The vacuum oil tank 1 is connected to the sealing structure of the generator through a circulation loop, thereby forming a sealing oil sealing loop. The oil-gas separator 3 is connected to the exhaust port of the vacuum oil tank 1 through an exhaust pipeline 2, and the exhaust pipeline 2 guides the oil and gas in the vacuum oil tank 1 into the oil-gas separator 3. The vacuum pump 7 is connected to the exhaust hole of the oil-gas separator 3 through an air suction pipe 24, and the vacuum pump 7 is used to discharge the gas separated by the oil-gas separator 3 through an exhaust pipe 6. One end of the first oil return pipeline 9 is connected to the bottom of the oil-gas separator 3, and the other end is connected to the vacuum oil tank 1. The height of the oil-gas separator 3 is higher than the height of the top of the vacuum oil tank 1, so that the oil in the oil-gas separator 3 can flow into the vacuum oil tank 1 along the first oil return pipeline 9 under the action of gravity, so as to realize the reuse of the oil separated in the oil-gas separator 3.

[0038] The oil-gas separator 3 and the vacuum pump 7 are arranged on the same foundation surface. The exhaust pipe 6 is arranged at the exhaust hole position of the vacuum pump 7 to discharge the gas in the vacuum pump 7. In order to facilitate monitoring of the oil height in the oil-gas separator 3, a liquid level sensor 18 is arranged in the oil-gas separator 3.

[0039] The generator sealing oil vacuum pumping system of the utility model is provided with a first oil return pipeline 9 to connect the bottom of the oil-gas separator 3 with the vacuum oil tank 1. At the same time, the setting height of the oil-gas separator 3 is higher than the height of the vacuum oil tank 1, so that the oil in the oil-gas separator 3 flows into the vacuum oil tank 1 along the first oil return pipeline 9 under the action of gravity, and the separated oil automatically flows back to the vacuum oil tank 1. During the operation of the system, there is no need to stop the vacuum pump 7 to drain the oil, which avoids the change of the vacuum pressure in the vacuum oil tank caused by the shutdown of the vacuum pump in the prior art, ensures the stability of the vacuum degree in the vacuum oil tank 1, thereby improving the oil-gas separation efficiency in the vacuum oil tank 1, thereby ensuring the normal discharge of the oil and gas of the sealing oil in the vacuum oil tank 1, and the gas content in the circulating sealing oil is low, which ensures the purity of the hydrogen in the generator.

[0040] In order to improve the separation efficiency of the oil-gas separator 3, a separation filter 17 is provided in the oil-gas separator 3. Figure 3 and Figure 4As shown, the separation filter 17 is vertically arranged in the inner cavity of the oil-gas separator 3, the top of the separation filter 17 is connected to the top of the inner cavity of the oil-gas separator 3, and the lower part of the separation filter 17 is connected to the bottom of the inner cavity of the oil-gas separator 3; the separation filter 17 separates the oil inlet and the exhaust hole of the oil-gas separator 3, so that the inner cavity of the oil-gas separator 3 forms two sub-chambers, that is, the inner cavity of the oil-gas separator 3 includes a first chamber 301 close to the oil inlet of the oil-gas separator 3 and a second chamber 302 close to the exhaust hole of the oil-gas separator 3. The first chamber 301 is connected to the second chamber 302 through the mesh on the separation filter 17. The first chamber 301 is connected to the first oil return pipeline 9 through the first oil return branch 20, and the second chamber 302 is connected to the first oil return pipeline 9 through the second oil return branch 19. The first oil return branch 20 and the second oil return branch 19 are arranged in parallel. By setting the separation filter 17, the oil droplets in the oil and gas passing through the separation filter 17 are further condensed on the filter and collected along the filter, thereby further improving the separation effect of oil and gas. The oil and gas enter the oil and gas separator 3 for expansion separation. The oil in the gas and oil mist begins to condense at the bottom of the oil and gas separator 3. The foam in the oil mist is further gathered and separated when passing through the separation filter 17. At the same time, a liquid level sensor 18 is set in the oil and gas separator 3. When the liquid level rises under special conditions of system equipment failure, an alarm is issued and the vacuum pump 7 is stopped. The liquid level sensor 18 and the vacuum pump 7 are both connected to the controller for communication. The utility model sets a separation filter 17 in the oil-gas separator 3, and the separation filter 17 separates the oil vapor and foam in the oil-gas separator 3. The separated foam and a small amount of separated oil accumulate in the oil-gas separator 3, which will cause the liquid level in the separator to rise. The utility model sets oil return branches before and after the filter of the oil-gas separator 3, which can ensure that the oil generated before and after the filter returns to the vacuum oil tank 1 in time, avoiding the shutdown of the vacuum pump 7 due to the increase of the liquid level caused by the accumulation of oil and foam, and at the same time the accumulated oil is recovered, which plays an energy-saving role.

[0041] Since the inner cavity of the oil-gas separator 3 is divided into the first chamber 301 and the second chamber 302 by setting the separation filter 17, there is a small pressure difference between the pressures in the first chamber 301 and the second chamber 302, and the pressure in the first chamber 301 is slightly greater than the pressure in the second chamber 302. In order to avoid the formation of a small loop due to the pressure difference between the first chamber 301 and the second chamber 302, the small loop here refers to the loop formed by the oil between the first chamber 301, the second chamber 302, the second oil return branch 19 and the first oil return branch 20, a U-shaped pipe section 1901 is provided on the second oil return branch 19, and the U-shaped pipe section 1901 is provided near the position where the second oil return branch 19 is connected to the first oil return pipeline 9, as shown in FIG. Figure 3 As shown, it can be understood that the height of the U-shaped pipe section 1901 is lower than the height of the connecting port between the second oil return branch 19 and the first oil return pipeline 9 .

[0042] The height H of the U-shaped tube section 1901 is 300-600 mm. The specific value of the height H of the U-shaped tube section 1901 is set by those skilled in the art according to the actual pressure difference between the first chamber 301 and the second chamber 302. When the pressure difference between the two is large, a larger height value is selected, and when the pressure difference is small, a smaller height value is selected. In one embodiment, the height H of the U-shaped tube section 1901 is set to 500 mm.

[0043] Furthermore, one end of the first oil return pipeline 9 is connected to the first oil return branch 20 and the second oil return branch 19, and the other end is connected to the drain pipe 11. Since the oil-gas separator 3 is arranged close to the vacuum pump 7, the pressure in the oil-gas separator 3 is slightly lower than the pressure in the vacuum oil tank 1. In order to facilitate the smooth reflux of the oil in the first oil return pipeline 9, the drain pipe 11 is connected to the bottom of the vacuum oil tank 1, and the drain pipe 11 and the first oil return pipeline 9 form a U-shaped pipeline, such as Figure 5 As shown, the height of the liquid level A in the first oil return pipeline 9 is slightly higher than the height of the liquid level B in the vacuum oil tank 1, so that the oil in the first oil return pipeline 9 can flow smoothly into the vacuum oil tank 1. An oil discharge isolation valve 10 is provided at a position of the drain pipe 11 away from the vacuum oil tank 1 and the first oil return pipeline 9. An oil return isolation valve 8 is provided on the first oil return pipeline 9. When draining oil, the oil discharge isolation valve 10 is opened and the oil return isolation valve 8 on the first oil return pipeline 9 is closed. When returning oil, the oil return isolation valve 8 is opened and the oil discharge isolation valve 10 is closed. By providing the first oil return pipeline 9, the oil in the oil-gas separator 3 is returned to the vacuum oil tank 1, oil loss is avoided, and the liquid level in the vacuum oil tank 1 is kept stable.

[0044] In order to facilitate oil and gas separation, an inclined pipe section 201 is provided on the air extraction pipeline 2. Figure 2 The slope of the inclined pipe section 201 is not less than 2%, and the height of the inclined pipe section 201 gradually increases from the end close to the vacuum oil tank 1 to the end away from the vacuum oil tank 1. The exhaust pipeline 2 is a vacuum pump exhaust pipeline. When the mixture of gas and oil gas separated in the vacuum oil tank 1 passes through the inclined pipe section 201, the oil gas in the gas will condense on the wall of the inclined pipe section 201. The inclined pipe section 201 is set with a certain slope, which is conducive to the oil flowing back to the vacuum oil tank 1 along the pipe wall under the action of gravity.

[0045] Specifically, the circulation loop includes an oil supply pipe 13 connected to the vacuum oil tank 1 and a second oil return pipe 12, and the pipeline connected to the oil supply pipe 13 and the second oil return pipe 12 is connected to the sealing structure of the generator. In order to improve the purity of the sealing oil, the outlet height of the second oil return pipe 12 is higher than the oil level in the vacuum oil tank 1, such as Figure 6As shown, the outlet of the second oil return pipeline 12 is provided with a first nozzle 23, and one or more first nozzles 23 may be provided. By providing the first nozzle 23, the oil entering the vacuum oil tank 1 is sprayed into mist through the nozzle, and under high vacuum conditions, the air and moisture in the oil are quickly separated and discharged in time by the vacuum pump 7. The oil inlet of the oil supply pipe 13 is provided at the bottom of the vacuum oil tank 1.

[0046] In order to facilitate the replenishment or discharge of oil from the vacuum oil tank 1 and adjust the total amount of oil in the vacuum oil tank 1, the vacuum oil tank 1 is provided with an oil replenishment pipe 14 and an oil discharge pipe 15. The oil inlet of the oil discharge pipe 15 is arranged at the bottom of the vacuum oil tank 1. The outlet of the oil replenishment pipe 14 is located in the inner cavity of the vacuum oil tank 1, and the outlet height of the oil replenishment pipe 14 is higher than the oil level in the vacuum oil tank 1. The outlet of the oil replenishment pipe 14 is provided with a second nozzle 22. By providing the second nozzle 22, the oil entering the vacuum oil tank 1 is sprayed into mist through the nozzle. Under high vacuum conditions, the air and moisture in the oil are quickly separated and discharged in time by the vacuum pump 7.

[0047] Among them, the suction pipe 24 is provided with a vacuum pump isolation valve 4 and a first vacuum breaking valve 5. By setting the first vacuum breaking valve 5 located on the suction pipe 24, the maintenance of the vacuum pump 7 or the oil-gas separator 3 is facilitated. When the vacuum pump 7 or the oil-gas separator 3 is overhauled, the first vacuum breaking valve 5 is opened, and air enters the suction pipe 24, so that the pressure in the pipeline and equipment reaches the atmospheric pressure as soon as possible, shortening the maintenance time. The second vacuum breaking valve 16 and the valve 21 are provided on the exhaust pipeline 2, and the second vacuum breaking valve 16 is provided close to the vacuum oil tank 1. When the vacuum oil tank 1 needs to be overhauled, the second vacuum breaking valve 16 is opened, so that air enters the vacuum oil tank 1, destroys the vacuum in the vacuum oil tank 1, and makes the vacuum oil tank 1 reach the atmospheric pressure as soon as possible, shortening the maintenance time. The valve 21 is provided at a position of the exhaust pipeline 2 close to the oil-gas separator 3, such as Figure 4 The second vacuum breaking valve 16 is arranged at a position of the exhaust pipe 2 close to the vacuum oil tank 1. Figure 2 As shown, Figure 2 The arrow direction is the fluid flow direction.

[0048] The height of the oil inlet of the oil-gas separator 3 is lower than the height of the exhaust hole of the oil-gas separator 3 . In order to facilitate the exhaust of gas in the oil-gas separator 3 , the exhaust hole of the oil-gas separator 3 is arranged close to the top of the oil-gas separator 3 .

[0049] The generator sealing oil is supplied through the vacuum oil tank 1. Under the vacuum environment in the vacuum oil tank 1, the gas, oil mist, etc. in the sealing oil are separated. The separated gas, oil mist and unseparated foam enter the oil-gas separator 3 under the suction of the vacuum pump 7. The oil mist and gas are further expanded and separated in the oil-gas separator 3. The oil in the gas and oil mist begins to condense at the bottom of the container. The foam in the oil mist is further gathered and separated when passing through the separation filter 17. The separated liquid gathers at the bottom of the oil-gas separator 3. A first oil return pipeline 9 is provided at the bottom of the oil-gas separator 3. Under the action of the dead weight of the oil, the oil returns to the vacuum oil tank 1 through the first oil return pipeline 9. The first oil return pipeline 9 is provided with an oil return isolation valve 8. When there is an abnormality on the first oil return pipeline 9, the oil return isolation valve 8 can be closed without stopping the vacuum pump 7 for maintenance. The separated gas without oil mist is discharged through the vacuum pump 7. A U-shaped pipe section 1901 is provided on the second oil return branch 19 behind the separation filter 17 in the oil-gas separator 3 to prevent the first chamber 301 and the second chamber 302 on both sides of the separation filter 17 from forming a closed loop under the action of the pressure difference. A liquid level sensor 18 is provided in the oil-gas separator 3. When the liquid level rises under the condition of a system equipment failure, the liquid level sensor 18 issues an alarm and stops the vacuum pump 7.

[0050] In the generator sealing oil vacuum pumping system of the utility model, the oil-gas separator 3 can realize automatic oil discharge when the vacuum pump 7 is in operation, without manual operation, thereby improving the reliability and automation of the equipment operation. The destruction of the vacuum pressure in the vacuum oil tank 1 caused by the shutdown of the vacuum pump 7 is avoided, the separation efficiency of the water and air in the sealing oil under vacuum conditions is improved, the quality of the sealing oil is improved, and thus the operating reliability of the generator is improved. The oil-gas separator 3 can completely recover the accumulated separated oil, avoiding the waste of oil.

[0051] In the description of this solution, it should be understood that the terms "upper", "lower", "vertical", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this solution.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this solution, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0054] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A generator sealing oil vacuum system, characterized in that: include: A vacuum oil tank connected to the generator through a circulation loop; An oil-gas separator is connected to the exhaust port of the vacuum oil tank through an exhaust pipeline; A vacuum pump connected to the exhaust hole of the oil-gas separator through an air suction pipe; a first oil return pipeline, one end of which is connected to the bottom of the oil-gas separator, and the other end of which is connected to the vacuum oil tank; The height of the oil-gas separator is higher than the height of the vacuum oil tank.

2. The generator sealing oil vacuum pumping system according to claim 1, characterized in that: A separation filter is provided in the oil-gas separator, and the separation filter separates the oil inlet and the exhaust hole of the oil-gas separator, thereby forming a first chamber close to the oil inlet of the oil-gas separator and a second chamber close to the exhaust hole of the oil-gas separator; The first chamber is in communication with the first oil return pipeline through a first oil return branch, and the second chamber is in communication with the first oil return pipeline through a second oil return branch.

3. The generator sealing oil vacuum pumping system according to claim 2, characterized in that: A U-shaped pipe section is provided on the second oil return branch, and the U-shaped pipe section is arranged near the position where the second oil return branch connects to the first oil return pipeline. The height of the U-shaped pipe section is lower than the height of the connecting port between the second oil return branch and the first oil return pipeline.

4. The generator sealing oil vacuum pumping system according to claim 2, characterized in that: One end of the first oil return pipeline is connected to the first oil return branch and the second oil return branch, and the other end is connected to a drain pipe, and the drain pipe is connected to the bottom of the vacuum oil tank. An oil drain isolation valve is provided at a position of the drain pipe away from the vacuum oil tank and the first oil return pipeline.

5. The generator sealing oil vacuum pumping system according to any one of claims 1 to 4, characterized in that: The air extraction pipeline is provided with an inclined pipe section, the slope of the inclined pipe section is not less than 2%, and the height of the inclined pipe section gradually increases from one end close to the vacuum oil tank to one end away from the vacuum oil tank.

6. The generator sealing oil vacuum system according to claim 1, characterized in that: The circulation loop includes an oil supply pipe connected to the vacuum oil tank and a second oil return pipe, the pipe outlet height of the second oil return pipe is higher than the oil level in the vacuum oil tank, and the pipe outlet of the second oil return pipe is provided with a first nozzle.

7. The generator sealing oil vacuum pumping system according to claim 1, characterized in that: The vacuum oil tank is provided with an oil replenishing pipe and an oil draining pipe. The outlet height of the oil replenishing pipe is higher than the oil level in the vacuum oil tank. The outlet of the oil replenishing pipe is provided with a second nozzle.

8. The generator sealing oil vacuum pumping system according to claim 3, characterized in that: The height of the U-shaped pipe section is 300-600 mm.

9. The generator sealing oil vacuum pumping system according to claim 1, characterized in that: An oil return isolation valve is provided on the first oil return pipeline; The suction pipe is provided with a vacuum pump isolation valve.

10. The generator sealing oil vacuum pumping system according to claim 1, characterized in that: The height of the oil inlet of the oil-gas separator is lower than the height of the exhaust hole of the oil-gas separator.

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