Axial inlet axial flow compressor and its sealing system and sealing method

Abstract

The present invention relates to an axial flow compressor, specifically to an axially inlet axial flow compressor and its sealing system and sealing method. To solve the problem in the prior art that the oil filling pressure of the oil seal and the negative pressure of oil return do not match, resulting in the leakage of lubricating oil into the process air of the compressor and affecting the process operation. A first oil seal body and a gas seal body are sleeved on the main shaft of the axially inlet axial flow compressor of the present invention. The first oil seal body and the gas seal body are arranged in the inlet end bearing box and used for shaft end sealing of the lubricating oil. A first air inlet channel and a second air inlet channel are respectively arranged in the first oil seal body and the gas seal body. An intermediate exhaust channel is arranged between the first oil seal body and the gas seal body. Both the first oil seal body and the gas seal body are connected to the sealing system. The sealing system includes an air inlet system and a condensate drainage system. The condensate drainage system is used to drain the lubricating oil leaked into the first oil seal body and the gas seal body to prevent it from entering the compressor.

Description

Technical Field

[0001] The present invention relates to an axial-flow compressor, and particularly to an axial-inlet axial-flow compressor, its sealing system, and sealing method. Background Art

[0002] An axial-flow compressor is a device for compressing a large amount of air. According to different usage scenarios, axial-flow compressors are divided into radial-inlet and axial-inlet structures. The structural characteristics of an axial-inlet axial-flow compressor determine that it can reduce pipeline layout, resulting in less inlet pressure loss and higher efficiency. The air inlet of the axial-inlet axial-flow compressor surrounds the bearing box on the air inlet side in the middle part. The bearing box as a whole serves as part of the air inlet flow path. By optimizing the outer shape structure of the bearing box to make it part of the air inlet flow path, the air inlet loss can be reduced. This structure determines that the bearing box must adopt a special structure to prevent the lubricating oil inside the bearing box from overflowing into the compressed air. Existing axial-inlet axial-flow compressors simultaneously set up oil seal inflation and gas seal inflation on the inner side of the bearing box to isolate the lubricating oil from the external air. Generally, instrument air or nitrogen is used as the isolation gas. Usually, it can play a role in isolating the lubricating oil. However, it is difficult to adjust the pressures of the air inlet system and the condensate drainage system, and there will be a situation where the oil seal inflation pressure and the oil return negative pressure do not match, causing the lubricating oil to leak into the process air of the compressor and affecting the process operation. Summary of the Invention

[0003] The object of the present invention is to solve the deficiencies in the prior art that it is difficult to adjust the pressures of the air inlet system and the condensate drainage system, resulting in the mismatch between the oil seal inflation pressure and the oil return negative pressure, causing the lubricating oil to leak into the process air of the compressor and affecting the process operation, and to provide an axial-inlet axial-flow compressor, its sealing system, and sealing method.

[0004] To achieve the above object, the technical solution provided by the present invention is as follows:

[0005] An axial intake axial flow compressor includes a casing, an air inlet and an air outlet provided on the casing, a main shaft with both ends respectively installed in the casing through an inlet bearing and an outlet bearing, and a rotor sleeved on the main shaft; the inlet bearing and the outlet bearing are respectively installed in an inlet bearing housing and an outlet bearing housing, the inlet bearing housing is arranged in the air inlet of the casing, and the outlet bearing housing is located outside the casing; lubricating oil inlet and return systems are connected to both the inlet bearing and the outlet bearing; a second oil seal body is arranged in the outlet bearing housing; the special feature is that it further includes a first oil seal body and an air seal body that are sleeved on the main shaft and arranged in the inlet bearing housing, the first oil seal body and the air seal body are located between the inlet bearing and the rotor, the first oil seal body is arranged close to the side of the inlet bearing, a venting channel is formed between the first oil seal body and the inlet bearing, and an intermediate exhaust channel is formed between the first oil seal body and the air seal body; gaps are left between the first oil seal body, the air seal body and the second oil seal body and the side of the main shaft, denoted as a first gap, a second gap and a third gap in sequence; a first air inlet channel is arranged in the first oil seal body, the inner end of the first air inlet channel is communicated with the first gap, and the outer end is communicated with the air inlet system; a second air inlet channel is arranged in the air seal body, the inner end of the second air inlet channel is communicated with the second gap, and the outer end is communicated with the air inlet system; the inner ends of the venting channel, the intermediate exhaust channel, the first gap and the second gap are communicated, the outer end of the venting channel is communicated with the lubricating oil inlet and return system, and the outer end of the intermediate exhaust channel is communicated with the external environment.

[0006] Further, an oil seal condensate drain channel is also arranged on the first oil seal body, and an air seal condensate drain channel is also arranged on the air seal body. The inner ends of the oil seal condensate drain channel, the first gap, the inner end of the air seal condensate drain channel and the second gap are communicated, and the outer ends of the oil seal condensate drain channel and the air seal condensate drain channel are both communicated with the condensate drain system.

[0007] Further, an intermediate condensate drain channel arranged between the first oil seal body and the air seal body is also included. The inner end of the intermediate condensate drain channel is communicated with the first gap and the second gap, and the outer end is communicated with the condensate drain system.

[0008] Further, a second vent pipe is arranged at a position of the casing close to the air outlet, and the second vent pipe is used to communicate the inside of the compressor with the external environment;

[0009] A third air inlet channel is arranged in the second oil seal body, the inner end of the third air inlet channel is communicated with the third gap, and the outer end is communicated with the air inlet system.

[0010] Meanwhile, a sealing system for the above-mentioned axial inlet axial flow compressor is also provided, which is characterized in that: it includes an air inlet system connecting the first air inlet passage, the second air inlet passage and the second oil seal body, and a condensate drainage system connecting the first oil seal body corresponding to the first gap and the air seal body corresponding to the second gap; the air inlet system is used to convey sealing gas to the first oil seal body, the air seal body and the second oil seal body, and the condensate drainage system is used to drain the lubricating oil leaked into the first oil seal body and the air seal body; the outer end of the intermediate exhaust passage is connected with an intermediate exhaust pipe.

[0011] Further, the air inlet system includes an air inlet main pipe connected to the air source, and a first oil seal inlet pipe, an air seal inlet pipe, and a second oil seal inlet pipe with one end connected to the air inlet main pipe. The other end of the first oil seal inlet pipe is connected to the outer end of the first air inlet passage, the other end of the air seal inlet pipe is connected to the outer end of the second air inlet passage, and the other end of the second oil seal inlet pipe is connected to the outer end of the third air inlet passage;

[0012] Regulating valves and pressure gauges are arranged on the first oil seal inlet pipe, the air seal inlet pipe and the second oil seal inlet pipe.

[0013] Further, the condensate drainage system includes a condensate drainage main pipe, and an oil seal condensate drainage pipe, an intermediate condensate drainage pipe and an air seal condensate drainage pipe with one end connected to the condensate drainage main pipe. The other ends of the oil seal condensate drainage pipe, the intermediate condensate drainage pipe and the air seal condensate drainage pipe are respectively connected to the outer ends of the oil seal condensate drainage passage, the intermediate condensate drainage passage and the air seal condensate drainage passage;

[0014] Regulating valves are arranged on the oil seal condensate drainage pipe, the intermediate condensate drainage pipe and the air seal condensate drainage pipe.

[0015] Further, the first oil seal inlet pipe and the oil seal condensate drainage pipe are arranged radially along the air inlet of the axial flow compressor, located on the same cross-section, and the included angle between the first oil seal inlet pipe and the oil seal condensate drainage pipe is 60°;

[0016] The air seal inlet pipe and the intermediate exhaust pipe are arranged corresponding to the first oil seal inlet pipe radially along the air inlet of the axial flow compressor, and are located on the same side of the inlet end bearing box;

[0017] The intermediate condensate drainage pipe and the air seal condensate drainage pipe are arranged corresponding to the oil seal condensate drainage pipe radially along the air inlet of the axial flow compressor, and are located on the same side of the inlet end bearing box;

[0018] An air filter, a self-operated valve, a shut-off valve and a check valve are arranged in sequence along the air flow direction at one end of the air inlet main pipe close to the external air source;

[0019] Pressure gauges are arranged in both the first air inlet passage and the second air inlet passage;

[0020] One end of the first oil-sealed intake pipe, the gas-sealed intake pipe and the second oil-sealed intake pipe are connected to the intake manifold in sequence, and a pressure changer is provided between the positions where the intake manifold connects to the gas-sealed intake pipe and the second oil-sealed intake pipe;

[0021] The outer end of the vent channel is provided with a first vent pipe connected to the external environment, and a throttle valve is provided on the first vent pipe.

[0022] At the same time, a sealing method for an axial-inlet axial-flow compressor is also provided. The sealing method for the axial-inlet axial-flow compressor is based on the above-mentioned sealing system, and the method is special in that the method comprises the following steps:

[0023] Step 1, controlling the air intake system to introduce sealing air into the first oil seal body, the air seal body and the second oil seal body, and controlling the lubricating oil inlet and oil return systems to work normally;

[0024] Step 2, observing whether there is lubricating oil leakage from the first oil seal body and the gas seal body through the condensate removal system, and determining the leakage position;

[0025] Step 3: Take action based on the observations from step 2

[0026] If there is leakage, the leaked lubricating oil is discharged through the condensate discharge system, and the sealing gas pressure of the air intake system is adjusted according to the leakage position so that the sealing gas blocks the leakage of the lubricating oil; if there is no leakage, normal operation is continued.

[0027] Further, in step 2, whether there is lubricating oil leakage is observed through the intermediate condensate drain pipe;

[0028] In step 2, the leakage position is determined by opening the regulating valves on the oil seal condensate drain pipe and the gas seal condensate drain pipe one by one to determine the specific lubricating oil leakage position;

[0029] In step 3, the leaked lubricating oil is discharged through the condensate discharge system, and the sealing gas pressure of the air intake system is adjusted according to the leakage position so that the sealing gas blocks the leakage of the lubricating oil, specifically:

[0030] According to the leakage location, adjust the regulating valve of the oil seal condensate drain pipe and / or the air seal condensate drain pipe to discharge the leaked lubricating oil. At the same time, adjust the regulating valve of the first oil seal inlet pipe and / or the air seal inlet pipe and the throttle valve to adjust the sealing gas pressure so that the sealing gas can block the leakage of lubricating oil.

[0031] Further, the air source pressure connected to the air intake system is 0.3-0.6MPaG;

[0032] The pressures of the first oil-sealed air intake pipe, the air-sealed air intake pipe, the second oil-sealed air intake pipe, the first air intake passage, and the second air intake passage are all 20-40 kPaG; wherein the pressure of the first oil-sealed air intake pipe is greater than the pressure of the first air intake passage, and the pressure of the air-sealed air intake pipe is greater than the pressure of the second air intake passage;

[0033] The pressure of the intake manifold between the air-sealed intake pipe and the second oil-sealed intake pipe is 30-50 kPaG, and is greater than the pressure of the second oil-sealed intake pipe.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention is respectively provided with a first air inlet channel and a second air inlet channel in the first oil seal body and the air seal body, and is also provided with a venting channel and an intermediate exhaust channel, so as to improve the process of sealing gas. The sealing gas enters the first oil seal body and the air seal body respectively through the first air inlet channel and the second air inlet channel, and enters the first gap and the second gap respectively from the inner end of the first air inlet channel and the inner end of the second air inlet channel, and the leaked lubricating oil flows from the air inlet end bearing to the second gap. Therefore, between the first oil seal body and the air inlet end bearing, and between the air seal body and the first oil seal body, the lubricating oil and the sealing gas flow in opposite directions, and the sealing gas forms a barrier to the leaked lubricating oil. At the same time, the excess sealing gas is vented through the venting channel, the intermediate exhaust channel and the side of the air seal body away from the first oil seal body, so as to improve the venting process of the sealing gas, which is conducive to quickly adjusting the sealing gas pressure in the first oil seal body and the air seal body, effectively solving the problem of mismatch between the air inlet pressure and the oil return negative pressure in the axial air intake axial flow compressor, and completely avoiding the situation where the lubricating oil leaks into the process air of the axial flow compressor.

[0036] 2. The present invention is also provided with an oil seal condensate discharge channel, an air seal condensate discharge channel and an intermediate condensate discharge channel, which are used to discharge the leaked lubricating oil in time to avoid excessive lubricating oil accumulation in the intake end bearing box and enter the air inlet of the compressor; during the sealing process, the lubricating oil in the oil seal condensate discharge channel, the air seal condensate discharge channel and the intermediate condensate discharge channel is discharged through the condensate discharge system, and the lubricating oil leakage position can be determined by opening the regulating valves on the oil seal condensate discharge pipe and the air seal condensate discharge pipe in the sealing system one by one, and the regulating valves of the first oil seal intake pipe, the air seal intake pipe and the throttle valve can be adjusted in a targeted manner.

[0037] 3. The present invention realizes the control of the sealing gas through the intake system. The sealing gas seals the lubricating oil at the shaft end through the first oil seal body and the gas seal body. At the same time, the condensate drainage system is in a communicating state with both the first oil seal body and the gas seal body. Therefore, by adjusting the regulating valves provided on the oil seal condensate drainage pipe, the intermediate condensate drainage pipe, and the gas seal condensate drainage pipe in the condensate drainage system, the pressure in the first intake channel of the first oil seal body and the second intake channel of the gas seal body can be adjusted through the intermediate condensate drainage pipe, making the adjustment method of the sealing gas more flexible and convenient. At the same time, it can be used to observe whether there is lubricating oil leakage.

[0038] 4. In the sealing system of the present invention, the first oil seal intake pipe and the oil seal condensate drainage pipe are arranged radially along the intake port of the axial flow compressor and are located on the same cross-section. And the included angle between the first oil seal intake pipe and the oil seal condensate drainage pipe is 60°. The gas seal intake pipe and the intermediate exhaust pipe are correspondingly arranged with the first oil seal intake pipe, and the intermediate condensate drainage pipe and the gas seal condensate drainage pipe are correspondingly arranged with the oil seal condensate drainage pipe, so as to minimize the resistance of the intake port pipeline to the intake of the compressor. Description of the Drawings

[0039] Figure 1 It is a system schematic diagram of an embodiment of the sealing system of the axial intake axial flow compressor of the present invention;

[0040] Figure 2 It is a structural schematic diagram of the intake end bearing box in the embodiment of the present invention;

[0041] Description of the Reference Numerals in the Drawings

[0042] 100 - housing, 110 - intake port, 120 - exhaust port, 130 - second vent pipe, 200 - main shaft, 210 - rotor;

[0043] 300 - intake end bearing box, 310 - intake end bearing, 320 - first oil seal body, 321 - first gap, 322 - first intake channel, 323 - oil seal condensate drainage channel, 330 - gas seal body, 331 - second intake channel, 332 - second gap, 333 - gas seal condensate drainage channel, 340 - vent channel, 350 - intermediate exhaust channel, 360 - intermediate condensate drainage channel;

[0044] 400 - exhaust end bearing box, 410 - exhaust end bearing, 420 - second oil seal body, 421 - third intake channel, 422 - third gap;

[0045] 500 - intake main pipe, 501 - air filter, 502 - self - acting valve, 503 - shut - off valve, 504 - check valve, 510 - first oil seal intake pipe, 511 - regulating valve, 520 - gas seal intake pipe, 530 - second oil seal intake pipe, 540 - pressure gauge, 541 - pressure transducer, 550 - first vent pipe, 551 - throttle valve, 560 - intermediate exhaust pipe;

[0046] 600- condensate drain main pipe, 610- oil seal condensate drain pipe, 620- middle condensate drain pipe, 630- gas seal condensate drain pipe. DETAILED DESCRIPTION

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] In the following description, specific directional terms, such as "upper", "lower", etc., are used with reference to the corresponding drawings and are not to be considered as limitations of the present invention. When the defined direction of the drawings changes, the directions indicated by these words should be interpreted as corresponding different directions.

[0049] The axial inlet axial flow compressor and sealing system of the present invention are as follows: Figure 1 As shown, it includes a casing 100, an air inlet 110 and an air outlet 120 arranged on the casing 100, a main shaft 200 arranged along the axis of the casing 100, a rotor 210 arranged on the main shaft 200, an air inlet end bearing 310 and an air inlet end bearing box 300 arranged at one end of the main shaft 200 close to the air inlet 110, an exhaust end bearing 410 and an exhaust end bearing box 400 arranged at the other end of the main shaft 200, an air intake system connecting the air inlet end bearing box 300 and the exhaust end bearing box 400, and a condensate removal system connected to the air inlet end bearing box 300.

[0050] The intake end bearing 310 and the exhaust end bearing 410 are both connected to the lubricating oil inlet and return systems. The intake end bearing box 300 is arranged in the air inlet 110 of the casing 100, and the exhaust end bearing box 400 is arranged outside the compressor casing 100. A second oil seal body 420 is arranged in the exhaust end bearing box 400. A third gap 422 is left between the inner wall of the second oil seal body 420 and the side of the main shaft 200. A third air intake channel 421 is arranged in the second oil seal body 420. The inner end of the third air intake channel 421 is connected to the third gap 422. The second oil seal body 420 is used to prevent the lubricating oil leakage of the exhaust end bearing 410. The lubricating oil leaked from the exhaust end bearing 410 directly leaks into the exhaust end bearing box 400 and is cleaned regularly without affecting the compressor process. A second vent pipe 130 is arranged near the exhaust port 120 of the casing 100. The second vent pipe 130 is used to connect the inside of the compressor with the external environment.

[0051] A first oil seal body 320 and a gas seal body 330 are arranged in the intake end bearing housing 300. The first oil seal body 320 and the gas seal body 330 are sleeved on the main shaft 200 and are located between the intake end bearing 310 and the rotor 210. The first oil seal body 320 is arranged on the side close to the intake end bearing 310. The first oil seal body 320 and the gas seal body 330 are used to seal the lubricating oil in the intake end bearing housing 300. There are gaps between the inner walls of the first oil seal body 320 and the gas seal body 330 and the side surface of the main shaft 200, which are denoted as a first gap 321 and a second gap 332 in sequence.

[0052] As Figure 2 shown, a first intake channel 322 and an oil seal drain channel 323 are arranged in the first oil seal body 320, a second intake channel 331 and a gas seal drain channel 333 are arranged in the gas seal body 330. The inner ends of the first intake channel 322, the oil seal drain channel 323, the first gap 321, the inner end of the second intake channel 331, the inner end of the gas seal drain channel 333 and the second gap 332 are connected and communicated. Pressure gauges 540 are arranged in both the first intake channel 322 and the second intake channel 331, which are used to monitor the intake pressure of the first oil seal body 320 and the gas seal body 330; the outer ends of the first intake channel 322, the second intake channel 331 and the outer end of the third intake channel 421 are respectively provided with a first oil seal inlet pipe 510, a gas seal inlet pipe 520 and a second oil seal inlet pipe 530. Control valves 511 and pressure gauges 540 are arranged on the first oil seal inlet pipe 510, the gas seal inlet pipe 520 and the second oil seal inlet pipe 530, which are used for sequential pressure monitoring. The ends of the first oil seal inlet pipe 510, the gas seal inlet pipe 520 and the second oil seal inlet pipe 530 far from the compressor are connected to an intake main pipe 500, and the external air source is communicated through the intake main pipe 500. Along the air flow direction, an air filter 501, a control valve 511, a shut-off valve 503 and a check valve 504 are sequentially arranged at the end of the intake main pipe 500 close to the external air source. One ends of the first oil seal inlet pipe 510, the gas seal inlet pipe 520 and the second oil seal inlet pipe 530 are sequentially communicated with the intake main pipe 500, and a pressure changer 541 is arranged between the positions where the intake main pipe 500 is connected to the gas seal inlet pipe 520 and the second oil seal inlet pipe 530. An intermediate exhaust channel 350 and an intermediate drain channel 360 are also arranged between the first oil seal body 320 and the gas seal body 330. The inner ends of the intermediate exhaust channel 350 and the intermediate drain channel 360 are both connected and communicated with the first gap 321 and the second gap 332 at the same time, and the outer end of the intermediate exhaust channel 350 is communicated with the external environment through an intermediate exhaust pipe 560.

[0053] At the outer ends of the oil seal drain passage 323, the gas seal drain passage 333, and the intermediate drain passage 360, an oil seal drain pipe 610, an intermediate drain pipe 620, and a gas seal drain pipe 630 are respectively provided. The ends of the oil seal drain pipe 610, the intermediate drain pipe 620, and the gas seal drain pipe 630 away from the compressor are connected to a main drain pipe 600, and draining is carried out through the main drain pipe 600.

[0054] The first oil seal inlet pipe 510 and the oil seal drain pipe 610 are both arranged radially along the inlet of the axial flow compressor 110, located in the same cross-section, and the included angle between the first oil seal inlet pipe 510 and the oil seal drain pipe 610 is 180°; the gas seal inlet pipe 520 and the intermediate exhaust pipe 560 are arranged corresponding to the first oil seal inlet pipe 510 radially along the inlet of the axial flow compressor 110, and are located on the same side of the inlet end bearing box 300; the intermediate drain pipe 620 and the gas seal drain pipe 630 are arranged corresponding to the oil seal drain pipe 610 radially along the inlet of the axial flow compressor 110, and are located on the same side of the inlet end bearing box 300. In the present invention, the wiring of the pressure gauge 540 of the first intake passage 322 can be arranged along the first oil seal inlet pipe 510, or can be arranged separately. When arranged separately, the wiring of the pressure gauge 540 of the first intake passage 322 is located in the same cross-section as the first oil seal inlet pipe 510 and the oil seal drain pipe 610, is arranged radially along the inlet of the axial flow compressor 110, and the included angle between the wiring, the first oil seal inlet pipe 510, and the oil seal drain pipe 610 is 60°; the wiring of the pressure gauge 540 in the second intake passage 331 is arranged in the same way as the wiring of the pressure gauge 540 in the first intake passage 322.

[0055] A vent passage 340 with an inner end communicating with a first gap 321 is provided between the first oil seal body 320 and the inlet end bearing 310. The outer end of the vent passage 340 is connected to the external environment through a first vent pipe 550. A throttle valve 551 is provided on the first vent pipe 550. The first vent pipe 550 is adjusted through the throttle valve 551 to vent the sealing gas, so as to adjust the bearing cavity pressure in the inlet end bearing box 300 and the negative pressure of the lubricating oil system; the outer end of the first vent pipe 550, the outer end of the intermediate exhaust pipe 560, and the outer end away from the second vent pipe 130 are all arranged at high-point safety positions.

[0056] In this embodiment, the first oil seal body 320 includes two annular structures with a first installation gap left in the middle. This gap serves as both the first air intake passage 322 and the oil seal condensate drainage passage 323. The first installation gap is located above and below the main shaft 200 and is respectively connected to the first oil seal air inlet pipe 510 and the oil seal condensate drainage pipe 610. The air seal body 330 has the same structure as the first oil seal body 320, with a second installation gap that serves as both the second air intake passage 331 and the air seal condensate drainage passage 333. The second installation gap is located above and below the main shaft 200 and is respectively connected to the air seal air inlet pipe 520 and the air seal condensate drainage pipe 630. A third installation gap is provided between the adjacent annular structures of the first oil seal body 320 and the air seal body 330, which serves as both the intermediate exhaust passage 350 and the intermediate condensate drainage passage 360. The third installation gap is located above and below the main shaft 200 and is respectively connected to the intermediate exhaust pipe 560 and the intermediate condensate drainage pipe 620.

[0057] In other embodiments of the present invention, the first oil seal body 320 can also be a single annular structure. A first gap 321 is left between the inner side surface of the annular structure and the side surface of the main shaft 200. The side surface of the annular structure is provided with a radial first air intake passage 322 and an oil seal condensate drainage passage 323. The inner ends of both the first air intake passage 322 and the oil seal condensate drainage passage 323 are connected to the first gap 321, and the first air intake passage 322 is located above the main shaft 200 while the oil seal condensate drainage passage 323 is located below the main shaft 200. The air seal body 330 has the same structure as the first oil seal body 320, with a second gap 332 left between the air seal body 330 and the side surface of the main shaft 200, and corresponding second air intake passage 331 and air seal condensate drainage passage 333 are provided. An intermediate exhaust passage 350 and an intermediate condensate drainage passage 360 are left between the first oil seal body 320 and the air seal body 330.

[0058] The working method of the axial intake axial flow compressor includes the following steps:

[0059] Step 1, control the start of the seal gas intake system;

[0060] Step 2, control the operation of the lubricating oil inlet and return oil systems;

[0061] Step 3, start the compressor, and check the sealing performance of the intake end bearing housing 300 through the sealing system during the operation of the compressor.

[0062] Before injecting lubricating oil, the first oil seal body 320 and the second oil seal body 420 must be connected to intake air. Before starting the compressor, the air seal body must be connected to intake air.

[0063] The present invention realizes the sealing of the compressor lubricating oil through the sealing system and the connected first oil seal body 320, air seal body 330, and second oil seal body 420. The sealing method includes the following steps:

[0064] Step 1: Control the intake system to introduce sealing gas into the first oil seal body 320, the gas seal body 330, and the second oil seal body 420, and at the same time control the normal operation of the lubricating oil inlet and return systems.

[0065] Step 2: Observe whether there is lubricating oil leakage in the first oil seal body 320 and the gas seal body 330 through the intermediate drain pipe 620. Open the regulating valves 511 on the oil seal drain pipe 610 and the gas seal drain pipe 630 one by one to determine the specific location of the lubricating oil leakage.

[0066] Step 3: Take measures according to the observation results in Step 2.

[0067] If there is leakage, drain the leaked lubricating oil through the drain system, and at the same time adjust the sealing gas pressure of the intake system so that the sealing gas blocks the leakage of lubricating oil.

[0068] If there is no leakage, continue normal operation.

[0069] Drain the leaked lubricating oil through the drain system, and the specific adjustment of the sealing gas pressure is as follows:

[0070] The usage method of the sealing system of the axial intake axial flow compressor of the present invention specifically includes the following steps:

[0071] S1. Open the shut-off valve 503 on the intake main pipe 500, and adjust the regulating valves 511 on the intake main pipe 500 and the first oil seal inlet pipe 510 so that the pressure value of the pressure changer 541 on the intake main pipe 500 is greater than the pressure value of the pressure gauge 540 on the first oil seal inlet pipe 510; adjust the throttle valve 551 of the first vent pipe 550 so that the pressure value of the pressure gauge 540 on the first oil seal inlet pipe 510 is 10 kPa higher than the pressure value of the pressure gauge 540 on the first intake passage 322. During the debugging process, pay attention to the pressure of the lubricating oil inlet and return systems to ensure normal oil return and the normal operation of the oil mist blower in the lubricating oil inlet and return systems.

[0072] S2. Adjust the regulating valves 511 on the intake main pipe 500 and the gas seal inlet pipe 520 so that the pressure value of the pressure changer 541 on the intake main pipe 500 is greater than the pressure value of the pressure gauge 540 on the gas seal inlet pipe 520 and the pressure value of the pressure gauge 540 on the gas seal inlet pipe 520 is 10 kPa higher than the pressure value of the pressure gauge 540 on the second intake passage 331.

[0073] S3. Adjust the regulating valves 511 on the intake main pipe 500 and the second oil seal inlet pipe 530 so that the pressure value of the pressure changer 541 on the intake main pipe 500 is greater than the pressure value of the pressure gauge 540 on the second oil seal inlet pipe 530.

[0074] S4. By fully opening or adjusting the regulating valve 511 of the intermediate drain pipe 620, the pressure difference between the first air inlet passage 322 and the second air inlet passage 331 is made not to exceed 5 kPa.

[0075] After the lubricating oil inlet and return oil system works, observe the outlet of the drain main pipe 600. Under normal circumstances, there is no liquid such as lubricating oil at the outlet of the drain main pipe 600; when there is liquid at the outlet of the drain main pipe 600, open the regulating valves 511 on the oil seal drain pipe 610 and the gas seal drain pipe 630 one by one to determine the specific source of lubricating oil leakage. After confirming the source, adjust the sealing gas pressure by adjusting the regulating valves 511 of the first oil seal inlet pipe 510, the gas seal inlet pipe 520 and the throttle valve 551, and appropriately increase the sealing gas pressure in the first oil seal inlet pipe 510 and the gas seal inlet pipe 520 to make the sealing gas block the lubricating oil leakage. At the same time, adjust the regulating valves 511 of the oil seal drain pipe 610 and the gas seal drain pipe 630 to discharge the leaked lubricating oil.

[0076] Among them, the air source pressure connected to the intake system is 0.3 - 0.6 MpaG; the pressures of the first oil seal inlet pipe 510, the gas seal inlet pipe 520, the second oil seal inlet pipe 530, the first air inlet passage 322 and the second air inlet passage 331 are all 20 - 40 kPaG; among them, the pressure of the first oil seal inlet pipe 510 is greater than the pressure of the first air inlet passage 322, and the pressure of the gas seal inlet pipe 520 is greater than the pressure of the second air inlet passage 331; the pressure of the intake main pipe 500 between the gas seal inlet pipe 520 and the second oil seal inlet pipe 530 is 30 - 50 kPaG and is greater than the pressure of the second oil seal inlet pipe 530.

Claims

1. An axial intake axial flow compressor, comprising a casing (100), an air inlet (110) and an air outlet (120) provided on the casing (100), a main shaft (200) whose two ends are respectively installed in the casing (100) through an intake end bearing (310) and an exhaust end bearing (410), and a rotor (210) sleeved on the main shaft (200); the intake end bearing (310) and the exhaust end bearing (410) are respectively installed in an intake end bearing housing (300) and an exhaust end bearing housing (400), the intake end bearing housing (300) is arranged in the air inlet (110) of the casing (100), and the exhaust end bearing housing (400) is located outside the casing (100); lubricating oil inlet and return systems are connected to both the intake end bearing (310) and the exhaust end bearing (410); a second oil seal body (420) is provided in the exhaust end bearing housing (400); It is characterized in that: It further includes a first oil seal body (320) and an air seal body (330) which are sleeved on the main shaft (200) and arranged in the intake end bearing housing (300). The first oil seal body (320) and the air seal body (330) are located between the intake end bearing (310) and the rotor (210). The first oil seal body (320) is arranged on the side close to the intake end bearing (310). A venting channel (340) is formed between the first oil seal body (320) and the intake end bearing (310). An intermediate exhaust channel (350) is formed between the first oil seal body (320) and the air seal body (330); Gaps are left between the first oil seal body (320), the air seal body (330) and the side surface of the main shaft (200), which are denoted as a first gap (321), a second gap (332) and a third gap (422) in sequence; A first air intake channel (322) is provided in the first oil seal body (320). The inner end of the first air intake channel (322) is communicated with the first gap (321), and the outer end is communicated with the air intake system; A second air intake channel (331) is provided in the air seal body (330). The inner end of the second air intake channel (331) is communicated with the second gap (332), and the outer end is communicated with the air intake system; The inner end of the venting channel (340), the inner end of the intermediate exhaust channel (350), the first gap (321) and the second gap (332) are communicated with each other. The outer end of the venting channel (340) is communicated with the lubricating oil inlet and return system, and the outer end of the intermediate exhaust channel (350) is communicated with the external environment.

2. The axial intake axial flow compressor according to claim 1, characterized in that: An oil seal condensate drainage channel (323) is further provided on the first oil seal body (320), and a gas seal condensate drainage channel (333) is further provided on the gas seal body (330). The inner end of the oil seal condensate drainage channel (323), the first gap (321), the inner end of the gas seal condensate drainage channel (333) and the second gap (332) are communicated with each other. The outer ends of the oil seal condensate drainage channel (323) and the gas seal condensate drainage channel (333) are both communicated with the condensate drainage system.

3. The axial intake axial flow compressor according to claim 2, characterized in that: It further includes an intermediate drain channel (360) disposed between the first oil seal body (320) and the gas seal body (330). The inner end of the intermediate drain channel (360) is in communication with the first gap (321) and the second gap (332), and the outer end is in communication with the drain system.

4. The axial intake axial flow compressor according to any one of claims 1-3, characterized in that: A second vent pipe (130) is provided at a position of the casing (100) close to the exhaust port (120). The second vent pipe (130) is used to communicate the inside of the compressor with the external environment; A third intake channel (421) is provided in the second oil seal body (420). The inner end of the third intake channel (421) is in communication with the third gap (422), and the outer end is in communication with the intake system.

5. A sealing system for the axial intake axial flow compressor according to any one of claims 1-4, characterized in that: It includes an intake system communicating with the first intake channel (322), the second intake channel (331) and the second oil seal body (420), and a drain system communicating with the first oil seal body (320) corresponding to the first gap (321) and the gas seal body (330) corresponding to the second gap (332); the intake system is used to supply sealing gas to the first oil seal body (320), the gas seal body (330) and the second oil seal body (420), and the drain system is used to discharge the lubricating oil leaked into the first oil seal body (320) and the gas seal body (330); The outer end of the intermediate exhaust channel (350) is in communication with an intermediate exhaust pipe (560).

6. The sealing system for the axial intake axial flow compressor according to claim 5, characterized in that: The intake system includes an intake main pipe (500) connected to a gas source, and a first oil seal intake pipe (510), a gas seal intake pipe (520), and a second oil seal intake pipe (530) with one end communicating with the intake main pipe (500). The other end of the first oil seal intake pipe (510) communicates with the outer end of the first intake channel (322), the other end of the gas seal intake pipe (520) communicates with the outer end of the second intake channel (331), and the other end of the second oil seal intake pipe (530) communicates with the outer end of the third intake channel (421); Regulating valves (511) and pressure gauges (540) are provided on the first oil seal intake pipe (510), the gas seal intake pipe (520) and the second oil seal intake pipe (530).

7. The sealing system for the axial intake axial flow compressor according to claim 6, characterized in that: The drain system includes a drain main pipe (600), and an oil seal drain pipe (610), an intermediate drain pipe (620) and a gas seal drain pipe (630) with one end communicating with the drain main pipe (600). The other end of the oil seal drain pipe (610), the other end of the intermediate drain pipe (620), and the other end of the gas seal drain pipe (630) respectively communicate with the outer end of the oil seal drain channel (323), the outer end of the intermediate drain channel (360), and the outer end of the gas seal drain channel (333); Regulating valves (511) are provided on the oil seal drain pipe (610), the intermediate drain pipe (620) and the gas seal drain pipe (630).

8. The sealing system of the axial inlet axial flow compressor according to claim 7, characterized in that: The first oil seal inlet pipe (510) and the oil seal drain pipe (610) are both arranged radially along the inlet (110) of the axial flow compressor, located on the same cross-section, and the included angle between the first oil seal inlet pipe (510) and the oil seal drain pipe (610) is 60°; The air seal inlet pipe (520) and the intermediate exhaust pipe (560) are arranged corresponding to the first oil seal inlet pipe (510) radially along the inlet (110) of the axial flow compressor, and are located on the same side of the inlet bearing housing (300); The intermediate drain pipe (620) and the air seal drain pipe (630) are arranged corresponding to the oil seal drain pipe (610) radially along the inlet (110) of the axial flow compressor, and are located on the same side of the inlet bearing housing (300); One end of the intake main pipe (500) close to the external air source is sequentially provided with an air filter (501), a self-acting valve (502), a shut-off valve (503) and a check valve (504) along the air flow direction; Pressure gauges (540) are arranged in both the first intake passage (322) and the second intake passage (331); One ends of the first oil seal inlet pipe (510), the air seal inlet pipe (520) and the second oil seal inlet pipe (530) are sequentially communicated with the intake main pipe (500), and a pressure changer (541) is arranged between the positions where the intake main pipe (500) is connected to the air seal inlet pipe (520) and the second oil seal inlet pipe (530); The outer end of the vent passage (340) is provided with a first vent pipe (550) communicating with the external environment, and a throttle valve (551) is arranged on the first vent pipe (550).

9. A sealing method for an axial inlet axial flow compressor, based on the sealing system of the axial inlet axial flow compressor according to claim 8, characterized in that, Including the following steps: Step 1, controlling the intake system to introduce sealing gas into the first oil seal body (320), the air seal body (330) and the second oil seal body (420), and at the same time controlling the normal operation of the lubricating oil inlet and return oil systems; Step 2, observing whether there is lubricating oil leakage in the first oil seal body (320) and the air seal body (330) through the drain system, and determining the leakage position; Step 3, disposing according to the observation result of Step 2; If there is leakage, discharging the leaked lubricating oil through the drain system, and at the same time adjusting the sealing gas pressure of the intake system according to the leakage position so that the sealing gas blocks the leakage of lubricating oil; If there is no leakage, continue to operate normally.

10. The sealing method of the axial inlet axial flow compressor according to claim 9, characterized in that: In Step 2, observing whether there is lubricating oil leakage through the intermediate drain pipe (620); In Step 2, the determination of the leakage position is specifically: opening the regulating valves (511) on the oil seal drain pipe (610) and the air seal drain pipe (630) one by one to determine the specific lubricating oil leakage position; In Step 3, the discharging of the leaked lubricating oil through the drain system and at the same time adjusting the sealing gas pressure of the intake system according to the leakage position so that the sealing gas blocks the leakage of lubricating oil is specifically: According to the leakage location, adjust the regulating valve (511) of the oil seal drain pipe (610) and / or the gas seal drain pipe (630) to drain the leaked lubricating oil. At the same time, adjust the regulating valve (511) of the first oil seal inlet pipe (510) and / or the gas seal inlet pipe (520) and the throttle valve (551) to adjust the seal gas pressure so that the seal gas blocks the leakage of lubricating oil.

11. The sealing method of the axial inlet axial flow compressor according to claim 10, characterized in that: The air source pressure connected to the intake system is 0.3 - 0.6 MPaG; The pressures of the first oil seal inlet pipe (510), the gas seal inlet pipe (520), the second oil seal inlet pipe (530), the first intake passage (322) and the second intake passage (331) are all 20 - 40 kPaG; among them, the pressure of the first oil seal inlet pipe (510) is greater than the pressure of the first intake passage (322), and the pressure of the gas seal inlet pipe (520) is greater than the pressure of the second intake passage (331); The pressure of the intake main pipe (500) between the gas seal inlet pipe (520) and the second oil seal inlet pipe (530) is 30 - 50 kPaG and is greater than the pressure of the second oil seal inlet pipe (530).

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