Micro-oil double-screw medium-pressure nitrogen booster unit

Abstract

The invention provides a micro-oil double-screw medium-pressure nitrogen booster unit, and relates to the field of booster units. The medium-pressure nitrogen pressurizing device for crude oil extraction in the oil field comprises a device base, a device shell is fixedly connected to the top of the device base, a first heat dissipation hole is formed in the position, close to the left side edge, of the top of the device shell, and a nitrogen inlet is fixedly connected to the inner wall of the device shell; and a second heat dissipation hole is formed in the right surface of the device shell and close to the rear side of the nitrogen inlet. Through the use of the recycling mechanism and the cooling mechanism, lubricating oil can be separated from nitrogen after assisting nitrogen pressurization and entering the oil-gas separator, then the lubricating oil can enter the efficient double-screw main machine again through the recycling mechanism to provide assistance of increasing pressure for new nitrogen, and then the lubricating oil can be used for many times; and the nitrogen increasing cost is reduced, the lubricating oil adding frequency is reduced, and therefore the device is more practical.

Description

Technical Field

[0001] The invention relates to the technical field of booster units, in particular to a micro-oil twin-screw medium-pressure nitrogen booster unit. Background Art

[0002] Oil production engineering is the general term for various engineering and technical measures taken on oil reservoirs through production wells and injection wells according to development goals during oil field exploitation. As a comprehensive applied discipline, it studies the theory, engineering design methods and implementation technology of various engineering and technical measures that can be used economically and effectively on oil reservoirs to increase oil well production and crude oil recovery. The actual use of piston medium-pressure boosters has large vibrations, high noise, high energy consumption and long maintenance time.

[0003] When applying for the present invention, the applicant found through searching that a Chinese patent disclosed a "single-well and multi-well negative pressure drainage booster unit". The patent mainly adopts the design of a connecting device in the group, which can prevent water leakage when two pipes are connected, which can also increase the practicality of the device. The design of the connecting extension pipe and the extension sealing ring on the connecting device increases the sealing between the pipes when the device is draining water. However, the booster water pump is directly used during the use of the device, which makes the energy consumption of the device relatively large, and there is no mechanism for improving the boosting capacity, which is not conducive to application in the oil field exploitation process. Therefore, according to the invention of the applicant, a device is invented that can reduce the energy consumption of oil field exploitation and has better boosting capacity, which solves the problem of high energy consumption and poor boosting capacity during the use of the booster unit. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides a micro-oil twin-screw medium-pressure nitrogen booster unit, which solves the problems of high energy consumption and poor boosting capacity during the use of the booster unit.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the present invention is implemented through the following technical solutions: a micro-oil twin-screw medium-pressure nitrogen booster unit, including a device base, the top of the device base is fixedly connected to a device shell, the top of the device shell and near the left edge is provided with a first heat dissipation hole, the inner wall of the device shell is fixedly connected to a nitrogen inlet, the right surface of the device shell and near the rear side of the nitrogen inlet is provided with a second heat dissipation hole, the left end of the nitrogen inlet is fixedly connected to an air intake regulating valve, the air intake regulating valve is fixedly installed on the top of the device base, the side of the air intake regulating valve away from the nitrogen inlet is fixedly connected to a high-efficiency twin-screw main engine, the outer side of the high-efficiency twin-screw main engine A right-angle plate is fixedly installed on the wall, and the right-angle plate is fixedly installed on the top of the device base. A first motor is fixedly connected to the side of the high-efficiency twin-screw main engine away from the air intake regulating valve, and the first motor is fixedly installed on the top of the device base. An exhaust check valve is fixedly installed on the back of the high-efficiency twin-screw main engine, and an oil-gas separator is fixedly installed on the side of the exhaust check valve away from the high-efficiency twin-screw main engine. A minimum pressure valve is fixedly installed on the left side of the oil-gas separator, and a cooling mechanism is fixedly connected to the left side of the minimum pressure valve. The cooling mechanism is fixedly connected to the top of the device base, and a recycling mechanism is fixedly installed on the side of the oil-gas separator away from the cooling mechanism. The first motor is a permanent magnet variable frequency motor, and the motor speed can be adjusted by the frequency converter, and then the self-adjustment of the air intake volume can be achieved through the high-efficiency twin-screw main unit. The setting of the right-angle plate of the component closely connects the high-efficiency twin-screw main unit with the base of the device, thereby reducing the vibration generated by the high-efficiency twin-screw main unit during operation and increasing the stability of the device. The intake regulating valve controls the length of the intake manifold. When the engine is idling, the intake pipe is adjusted to increase the vortex, the intake is stable, and the idle speed is stable, thereby increasing the stability of the device. The cooling mechanism can cool the exhausted nitrogen to avoid the exhaust nitrogen from causing harm to the next process due to its high temperature. The recycling mechanism can reuse the lubricating oil, reducing the consumption of lubricating oil. The use of lubricating oil can reduce the noise of the device, reduce the wear of components, and improve the supercharging effect. Recycling can reduce processing costs.

[0008] Preferably, the recycling mechanism includes an oil cooling shell, a connecting plate, a second motor, fan blades, a first reinforcement ring, a second reinforcement ring, a second protective net, a first oil pipeline, an oil filter, a second oil pipeline, an oil cut-off valve and a third oil pipeline, wherein the oil cooling shell is fixedly connected to the upper surface of the device base and close to the right side of the oil-gas separator, the connecting plate is fixedly connected to the inner surface of the oil cooling shell, the second motor is fixedly connected to the side of the connecting plate away from the cooling mechanism, and the fan blades are fixedly connected to the output end of the second motor close to the cooling mechanism. The rotation of the fan blades cools the lubricating oil, thereby preventing the lubricating oil from carrying high temperature to contact with subsequent mechanisms, causing damage to components, and extending the service life of the device.

[0009] Preferably, the first oil pipeline is fixedly connected to the side of the oil-gas separator away from the cooling mechanism, the first reinforcement ring is fixedly connected to the side of the connecting plate close to the first oil pipeline, and the second reinforcement ring is fixedly connected to the outer surface of the first oil pipeline. The arrangement of the first reinforcement ring and the second reinforcement ring avoids the connection plate and the second protection net being directly connected to the first oil pipeline, thereby avoiding a large pressure on a part of the first oil pipeline, causing the first oil pipeline to rupture. The arrangement of the first reinforcement ring and the second reinforcement ring connects the first oil pipeline with the connecting plate and the second protection net, which strengthens the first oil pipeline and reduces the maintenance frequency of the device.

[0010] Preferably, the second protective net is fixedly connected to the outer surface of the second reinforcement ring, the second protective net is fixedly connected to the outer surface of the oil cooling shell, and the first reinforcement ring is fixedly connected to the outer surface of the first oil pipeline. The second protective net protects the internal structure of the oil cooling shell to prevent foreign objects from hitting the internal structure of the oil cooling shell, thereby causing damage to components, thereby increasing the service life of the device. At the same time, the holes in the second protective net allow the oil cooling shell to better exchange heat with the outside world, thereby improving the cooling efficiency of the mechanism.

[0011] Preferably, the oil filter is fixedly connected to one end of the first oil pipeline away from the oil-gas separator, the oil filter is fixedly installed on the upper surface of the device base, and the second oil pipeline is fixedly connected to the bottom of the oil filter. The oil filter can filter the larger particles that may be contained in the lubricating oil to prevent the lubricating oil from carrying larger solid particles and causing blockage between pipelines, which may even cause damage to components, thereby extending the life of the device.

[0012] Preferably, the oil cut-off valve is fixedly mounted at one end of the second oil pipe away from the oil filter, the third oil pipe is fixedly mounted at the lower end of the oil cut-off valve, and the third oil pipe is fixedly connected to the upper surface of the high-efficiency twin-screw main engine. The oil cut-off valve allows the lubricating oil pressure to be detected by the sensor set in the common rail, fed back to the control system, and the actual pressure value is always consistent with the pre-set pressure value adapted to the engine speed and load, thereby increasing the overall control of the device by the PLC controller, making the overall boost value of the device more controllable and accurate.

[0013] Preferably, the cooling mechanism comprises a mechanism shell, a third heat dissipation hole, a cooling pipe, a fixing block, a first protective net, a fan and a mechanism base, wherein the mechanism base is fixedly connected to the upper surface of the device base, the mechanism shell is fixedly connected to the upper surface of the mechanism base, and the third heat dissipation hole is provided at the upper end of the mechanism shell. The third heat dissipation hole facilitates the exchange of hot air inside the mechanism shell with the outside air, thereby improving the cooling effect of the device.

[0014] Preferably, the cooling pipe is fixedly connected to the side of the minimum pressure valve away from the oil-gas separator, the fixing block is fixedly connected to the outer surface of the cooling pipe, and the fixing block is fixedly connected to the left side of the inner wall of the mechanism shell. The winding shape of the cooling pipe allows the compressed nitrogen to have a longer cooling time, and the high-temperature nitrogen can be cooled to a suitable temperature. The fixing block allows the cooling pipe to be stably fixed to the inner wall of the mechanism shell, thereby reducing the noise and vibration generated by the nitrogen flowing through the cooling pipe, thereby increasing the stability of the device.

[0015] Preferably, the first protective net is fixedly connected to the upper surface of the mechanism base, the fan is fixedly connected to the inner wall of the mechanism base, the end of the cooling pipe close to the minimum pressure valve is fixedly connected to the inner wall of the mechanism shell, the outer wall of the end of the cooling pipe away from the minimum pressure valve is fixedly connected to the inner wall of the mechanism shell, and the end of the cooling pipe away from the minimum pressure valve is fixedly connected to the inner wall of the device shell. The first protective net protects the fan, prolongs the service life of the fan, reduces the maintenance frequency of the device, and thus increases the stability of the device.

[0016] Working principle: The nitrogen gas that needs to be pressurized enters the air intake regulating valve through the nitrogen inlet to produce a higher pressure oil-gas mixture under the compression of the high-efficiency twin-screw main engine. The oil-gas mixture enters the oil-gas separator through the exhaust check valve to separate the oil. As the oil-gas separation pressure increases, the nitrogen enters the cooling mechanism through the minimum pressure valve and enters the next process after cooling, and the pressurization is completed; after the oil-gas separation, the lubricating oil enters the first oil pipeline under the action of internal pressure and passes through the oil cooling shell for cooling, and then enters the oil filter to the oil cut-off valve to enter the high-efficiency twin-screw main engine and mixes with nitrogen for compression and pressurization. During the pressurization process, the PLC controller instructs each part of the unit to act according to the outlet pressure. When the pressure is lower than the set loading pressure, the PLC sends a command to open the air intake valve and close the pressure relief valve to load the unit for operation. When the outlet pressure reaches the frequency conversion setting value, the PLC controller sends a command to the frequency converter, and the first motor frequency conversion adjustment changes the speed of the high-efficiency twin-screw main engine to achieve stable pressure operation. When the gas consumption of the subsequent process continues to decrease, the frequency conversion reaches the minimum frequency, the outlet pressure rises to the unloading pressure, and the PLC controller sends a command to the air intake valve. After the air intake valve is closed, the machine runs in an unloaded state. The unit automatically adjusts the operating state according to the gas consumption of the subsequent process. When the unit is shut down, the PLC controller sends a command to close the air intake valve and open the pressure relief valve first, and the unit runs in an unloaded state. After the countdown, the PLC controller sends a shutdown command, and the oil shut-off valve is closed three to five seconds before the main engine stops rotating, and the unit enters the shutdown state.

[0017] (III) Beneficial effects

[0018] The present invention provides a micro-oil twin-screw medium-pressure nitrogen booster unit. It has the following beneficial effects:

[0019] 1. The device uses a PLC controller to perform the next operation according to the current state of the device, avoiding forced operation when the current state of the device is not suitable. This not only saves manpower consumption, but also avoids forced operation of the device, which may cause damage to the structure of the device components, prolongs the service life of the device, reduces the maintenance frequency of the device, and thus improves the processing efficiency of the device.

[0020] 2. Adding lubricating oil to the high-efficiency twin-screw main unit not only reduces the loss between the twin screws when the twin screws inside the high-efficiency twin-screw main unit are working, thereby extending the service life of the device, but also produces a higher pressure oil-gas mixture, thereby improving the nitrogen compression effect of the device.

[0021] 3. After helping to pressurize nitrogen, the lubricating oil will enter the oil-gas separator and be separated from the nitrogen. Then, it can enter the high-efficiency twin-screw main unit again through the recycling mechanism to provide pressure enhancement assistance for the new nitrogen, thereby realizing that the lubricating oil can be used multiple times, reducing the cost of nitrogen increase, and reducing the number of times the lubricating oil is added, making the device more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A three-dimensional diagram of the micro-oil twin-screw medium-pressure nitrogen booster unit proposed by the present invention;

[0023] Figure 2 This is a partial cross-sectional view of the micro-oil twin-screw medium-pressure nitrogen booster unit proposed by the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the micro-oil twin-screw medium-pressure nitrogen booster unit proposed in the present invention;

[0025] Figure 4 Another schematic diagram of the internal structure of the micro-oil twin-screw medium-pressure nitrogen booster unit proposed by the present invention;

[0026] Figure 5 This is a schematic diagram of the internal structure of the cooling mechanism of the micro-oil twin-screw medium-pressure nitrogen booster unit proposed in the present invention;

[0027] Figure 6 This is a schematic diagram of the internal structure of the oil cooling mechanism of the micro-oil twin-screw medium-pressure nitrogen booster unit proposed by the present invention;

[0028] Figure 7 The present invention is a structural diagram of an existing device for solving the technical problem mentioned in the background technology.

[0029] Among them, 1. device base; 2. device shell; 3. first heat dissipation hole; 4. second heat dissipation hole; 5. nitrogen inlet; 6. air intake regulating valve; 7. high-efficiency twin-screw main engine; 8. right-angle plate; 9. first motor; 10. exhaust check valve; 11. oil-gas separator; 12. cooling mechanism; 1201. mechanism shell; 1202. third heat dissipation hole; 1203. cooling pipe; 1204. fixing block; 1205. first protection net; 1206. wind machine; 1207, mechanism base; 13, recycling mechanism; 1301, oil cooling shell; 1302, connecting plate; 1303, second motor; 1304, fan blades; 1305, first reinforcement ring; 1306, second reinforcement ring; 1307, second protection net; 1308, first oil pipeline; 1309, oil filter; 1310, second oil pipeline; 1311, oil cut-off valve; 1312, third oil pipeline; 14, minimum pressure valve. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] like Figure 1-6 As shown, the embodiment of the present invention provides a micro-oil twin-screw medium-pressure nitrogen booster unit, and the recycling mechanism 13 includes an oil cooling shell 1301, a connecting plate 1302, a second motor 1303, a fan blade 1304, a first reinforcement ring 1305, a second reinforcement ring 1306, a second protective net 1307, a first oil pipeline 1308, an oil filter 1309, a second oil pipeline 1310, an oil cut-off valve 1311 and a third oil pipeline 1312. The oil cooling shell 1301 is fixedly connected to the upper surface of the device base 1 and close to the right side of the oil-gas separator 11, the connecting plate 1302 is fixedly connected to the inner surface of the oil cooling shell 1301, the second motor 1303 is fixedly connected to the side of the connecting plate 1302 away from the cooling mechanism 12, and the fan blade 1304 is fixedly connected to the output end of the second motor 1303 close to the cooling mechanism 12. A refrigeration plate can be added inside the oil cooling shell 1301 to further improve the refrigeration effect of the device to achieve the purpose of quickly reducing the oil temperature.

[0033] The first protection net 1205 is fixedly connected to the upper surface of the mechanism base 1207, the fan 1206 is fixedly connected to the inner wall of the mechanism base 1207, the end of the cooling pipe 1203 close to the minimum pressure valve 14 is fixedly connected to the inner wall of the mechanism housing 1201, the outer wall of the end of the cooling pipe 1203 away from the minimum pressure valve 14 is fixedly connected to the inner wall of the mechanism housing 1201, and the end of the cooling pipe 1203 away from the minimum pressure valve 14 is fixedly connected to the inner wall of the device housing 2. The side of the mechanism base 1207 may be provided with a door that can be opened and closed to facilitate the repair of the fan 1206 and the cleaning of the location where the fan 1206 is located.

[0034] The first oil delivery pipe 1308 is fixedly connected to the side of the oil-gas separator 11 away from the cooling mechanism 12, the first reinforcement ring 1305 is fixedly connected to the side of the connecting plate 1302 close to the first oil delivery pipe 1308, the second reinforcement ring 1306 is fixedly connected to the outer surface of the first oil delivery pipe 1308, the cooling pipe 1203 is fixedly connected to the side of the minimum pressure valve 14 away from the oil-gas separator 11, the fixing block 1204 is fixedly connected to the outer surface of the cooling pipe 1203, and the fixing block 1204 is fixedly connected to the left side of the inner wall of the mechanism housing 1201. A blocking gauze can be arranged below the third heat dissipation hole 1202 to reduce the entry of small particles into the interior of the mechanism housing 1201, thereby extending the service life of the device.

[0035] The second protection net 1307 is fixedly connected to the outer surface of the second reinforcement ring 1306, the second protection net 1307 is fixedly connected to the outer surface of the oil cooling shell 1301, the first reinforcement ring 1305 is fixedly connected to the outer surface of the first oil pipeline 1308, the cooling mechanism 12 includes a mechanism shell 1201, a third heat dissipation hole 1202, a cooling pipe 1203, a fixing block 1204, a first protection net 1205, a fan 1206 and a mechanism base 1207, the mechanism base 1207 is fixedly connected to the upper surface of the device base 1, the mechanism shell 1201 is fixedly connected to the upper surface of the mechanism base 1207, and the third heat dissipation hole 1202 is opened at the upper end of the mechanism shell 1201. The second protection net 1307 includes a plurality of rods, which can be connected by a ring for reinforcement, thereby extending the service life of the second protection net 1307.

[0036] The oil filter 1309 is fixedly connected to the end of the first oil pipeline 1308 away from the oil-gas separator 11, the oil filter 1309 is fixedly installed on the upper surface of the device base 1, the second oil pipeline 1310 is fixedly connected to the bottom of the oil filter 1309, the oil cut-off valve 1311 is fixedly installed at the end of the second oil pipeline 1310 away from the oil filter 1309, the third oil pipeline 1312 is fixedly installed at the lower end of the oil cut-off valve 1311, and the third oil pipeline 1312 is fixedly connected to the upper surface of the high-efficiency twin-screw main engine 7. The outer wall of the second oil pipeline 1310 can be added with a fixing component to fix it with the inner wall of the device housing 2 to avoid the second oil pipeline 1310 from being broken due to a loud tipping during the transportation of the device, thereby increasing the stability of the device.

[0037] The device comprises a device base 1, the top of which is fixedly connected with a device housing 2, a first heat dissipation hole 3 is provided at the top of the device housing 2 and near the left edge, a nitrogen inlet 5 is fixedly connected to the inner wall of the device housing 2, a second heat dissipation hole 4 is provided on the right surface of the device housing 2 and near the rear side of the nitrogen inlet 5, an air intake regulating valve 6 is fixedly connected to the left end of the nitrogen inlet 5, the air intake regulating valve 6 is fixedly installed on the top of the device base 1, a high-efficiency twin-screw main engine 7 is fixedly connected to the side of the air intake regulating valve 6 away from the nitrogen inlet 5, and a right-angle plate 8 is fixedly installed on the outer wall of the high-efficiency twin-screw main engine 7. A universal brake wheel can be installed at the bottom of the device base 1 to facilitate the transportation of the device, thereby improving the installation and fixing efficiency of the device.

[0038] The right angle plate 8 is fixedly mounted on the top of the device base 1, the side of the high-efficiency twin-screw main engine 7 away from the air intake regulating valve 6 is fixedly connected with the first motor 9, the first motor 9 is fixedly mounted on the top of the device base 1, the back of the high-efficiency twin-screw main engine 7 is fixedly mounted with an exhaust check valve 10, the side of the exhaust check valve 10 away from the high-efficiency twin-screw main engine 7 is fixedly mounted with an oil-gas separator 11, the left side of the oil-gas separator 11 is fixedly mounted with a minimum pressure valve 14, the left side of the minimum pressure valve 14 is fixedly connected with a cooling mechanism 12, the cooling mechanism 12 is fixedly connected to the top of the device base 1, and the side of the oil-gas separator 11 away from the cooling mechanism 12 is fixedly mounted with a recycling mechanism 13. The exhaust check valve 10 can be equipped with a support frame to reduce the pressure at the connection between the oil-gas separator 11 and the high-efficiency twin-screw main engine 7 and the exhaust check valve 10, reduce the wear at the two places, and thus extend the service life of the device.

[0039] Embodiment 2:

[0040] Reference Figure 7The existing patent embodiment is a single-well and multi-well negative pressure drainage booster unit, which includes a connecting device 4 in which the connecting extension pipe 42 on the first connecting block 41 is first placed into the second extension pipe 45, and then the extension sealing ring 43 on the second connecting block 45 is placed correspondingly into the groove on the first connecting block 41. At this time, the fastening ring 44 is first installed on the first connecting block 41, and the protruding block inside the fastening ring 44 is placed correspondingly with the groove on the surface of the first connecting block 41. Then, pliers or the like are used to reduce the distance between the first connecting block 41 and the second connecting block 45 until the protruding block on the fastening ring 44 is placed correspondingly with the groove on the second connecting block 45. At this time, after the fastening ring 44 is placed, the fastening ring 44 is retracted using the fastening screw 47.

[0041] Conclusion: In the first embodiment, a recycling mechanism is provided, so that after the lubricating oil helps the nitrogen to be pressurized, it can enter the oil-gas separator 11 and be separated from the nitrogen, and then it can enter the high-efficiency twin-screw main engine 7 again through the recycling mechanism 13 to provide pressure enhancement assistance for the new nitrogen, thereby achieving the effect that the lubricating oil can be used multiple times, reducing the cost of nitrogen increase, reducing the number of times the lubricating oil is added, and making the device more practical. In the second embodiment, a connecting device is provided, which solves the problem that when the booster unit is used for drainage, the distance between the water source and the drainage channel is generally achieved by connecting the pipes. The connection between the pipes often leaks when draining water, so when draining water, When water flows through the aisle interface, the water will be sprayed out. In this case, the sprayed water may accumulate together, which partially affects the road, etc., and the sprayed water also has a great impact on passers-by. Technical problems, but the mechanisms of embodiment 1 are firmly fixed, and there will be no oil leakage or air leakage. In addition, the lubricating oil used in embodiment 1 increases the pressurization effect of nitrogen. At the same time, the lubricating oil used to improve the pressurization effect can be reused, which saves processing costs and avoids the frequent addition of lubricating oil. At the same time, the PLC controller can appropriately make adjustments according to the current state of the device to reduce the damage between components caused by forced adjustments. There is no such setting in embodiment 2, and it is not suitable for promotion and use.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A micro-oil twin-screw medium-pressure nitrogen booster unit, comprising a device base (1), characterized in that: The top of the device base (1) is fixedly connected to a device housing (2), a first heat dissipation hole (3) is provided at the top of the device housing (2) and near the left edge, a nitrogen inlet (5) is fixedly connected to the inner wall of the device housing (2), a second heat dissipation hole (4) is provided on the right surface of the device housing (2) and near the rear side of the nitrogen inlet (5), an air intake regulating valve (6) is fixedly connected to the left end of the nitrogen inlet (5), the air intake regulating valve (6) is fixedly mounted on the top of the device base (1), a high-efficiency twin-screw main engine (7) is fixedly connected to the side of the air intake regulating valve (6) away from the nitrogen inlet (5), a right-angle plate (8) is fixedly mounted on the outer wall of the high-efficiency twin-screw main engine (7), and the right-angle plate (8) is fixedly mounted on the top of the device base (1). The high-efficiency twin-screw main engine (7) is fixedly connected to a first motor (9) on a side away from the air intake regulating valve (6), and the first motor (9) is fixedly mounted on the top of the device base (1); an exhaust check valve (10) is fixedly mounted on the back of the high-efficiency twin-screw main engine (7); an oil-gas separator (11) is fixedly mounted on a side of the exhaust check valve (10) away from the high-efficiency twin-screw main engine (7); a minimum pressure valve (14) is fixedly mounted on the left side of the oil-gas separator (11); a cooling mechanism (12) is fixedly connected to the left side of the minimum pressure valve (14); the cooling mechanism (12) is fixedly connected to the top of the device base (1); and a recycling mechanism (13) is fixedly mounted on a side of the oil-gas separator (11) away from the cooling mechanism (12).

2. The oil-free twin-screw medium-pressure nitrogen booster unit according to claim 1, characterized in that: The recycling mechanism (13) comprises an oil cooling shell (1301), a connecting plate (1302), a second motor (1303), a fan blade (1304), a first reinforcement ring (1305), a second reinforcement ring (1306), a second protection net (1307), a first oil pipeline (1308), an oil filter (1309), a second oil pipeline (1310), an oil cut-off valve (1311) and a third oil pipeline (1312); the oil cooling shell (1301) is fixedly connected to the upper surface of the device base (1) and close to the right side of the oil-gas separator (11); the connecting plate (1302) is fixedly connected to the inner surface of the oil cooling shell (1301); the second motor (1303) is fixedly connected to a side of the connecting plate (1302) away from the cooling mechanism (12); and the fan blade (1304) is fixedly connected to an output end of the second motor (1303) on a side close to the cooling mechanism (12).

3. The micro-oil twin-screw medium-pressure nitrogen booster unit according to claim 2, characterized in that: The first oil pipeline (1308) is fixedly connected to a side of the oil-gas separator (11) away from the cooling mechanism (12), the first reinforcement ring (1305) is fixedly connected to a side of the connecting plate (1302) close to the first oil pipeline (1308), and the second reinforcement ring (1306) is fixedly connected to the outer surface of the first oil pipeline (1308).

4. The oil-free twin-screw medium-pressure nitrogen booster unit according to claim 2, characterized in that: The second protection net (1307) is fixedly connected to the outer surface of the second reinforcement ring (1306), the second protection net (1307) is fixedly connected to the outer surface of the oil cooling shell (1301), and the first reinforcement ring (1305) is fixedly connected to the outer surface of the first oil pipeline (1308).

5. The micro-oil twin-screw medium-pressure nitrogen booster unit according to claim 2, characterized in that: The oil filter (1309) is fixedly connected to one end of the first oil pipeline (1308) away from the oil-gas separator (11), the oil filter (1309) is fixedly installed on the upper surface of the device base (1), and the second oil pipeline (1310) is fixedly connected to the bottom of the oil filter (1309).

6. The oil-free twin-screw medium-pressure nitrogen booster unit according to claim 2, characterized in that: The oil cut-off valve (1311) is fixedly mounted on an end of the second oil delivery pipe (1310) away from the oil filter (1309), the third oil delivery pipe (1312) is fixedly mounted on the lower end of the oil cut-off valve (1311), and the third oil delivery pipe (1312) is fixedly connected to the upper surface of the high-efficiency twin-screw main engine (7).

7. The oil-free twin-screw medium-pressure nitrogen booster unit according to claim 1, characterized in that: The cooling mechanism (12) comprises a mechanism housing (1201), a third heat dissipation hole (1202), a cooling pipe (1203), a fixing block (1204), a first protective net (1205), a fan (1206) and a mechanism base (1207); the mechanism base (1207) is fixedly connected to the upper surface of the device base (1); the mechanism housing (1201) is fixedly connected to the upper surface of the mechanism base (1207); and the third heat dissipation hole (1202) is provided at the upper end of the mechanism housing (1201).

8. The oil-free twin-screw medium-pressure nitrogen booster unit according to claim 7, characterized in that: The cooling pipe (1203) is fixedly connected to the side of the minimum pressure valve (14) away from the oil-gas separator (11), the fixing block (1204) is fixedly connected to the outer surface of the cooling pipe (1203), and the fixing block (1204) is fixedly connected to the left side of the inner wall of the mechanism housing (1201).

9. The oil-free twin-screw medium-pressure nitrogen booster unit according to claim 7, characterized in that: The first protective net (1205) is fixedly connected to the upper surface of the mechanism base (1207), the fan (1206) is fixedly connected to the inner wall of the mechanism base (1207), one end of the cooling pipe (1203) close to the minimum pressure valve (14) is fixedly connected to the inner wall of the mechanism housing (1201), the outer wall of one end of the cooling pipe (1203) away from the minimum pressure valve (14) is fixedly connected to the inner wall of the mechanism housing (1201), and one end of the cooling pipe (1203) away from the minimum pressure valve (14) is fixedly connected to the inner wall of the device housing (2).

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