CN115450913A

CN115450913A - Screw air compressor

Info

Publication number: CN115450913A
Application number: CN202211307883.1A
Authority: CN
Inventors: 钱海军
Original assignee: Jiangsu Mankai Energy Saving Technology Co ltd
Current assignee: Jiangsu Mankai Energy Saving Technology Co ltd
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2022-12-09

Abstract

The invention relates to the technical field of air compressors, and discloses a screw air compressor, which solves the problems that the conventional screw air compressor cannot directly cool a screw, and the service life of the screw air compressor is influenced due to poor cooling effect caused by single cooling mode; can realize the direct cooling to the screw rod through this screw compressor to can collect forced air cooling, water-cooling and oil-cooling as an organic whole, effectively improve the cooling effect, and then improve screw compressor's life.

Description

Screw air compressor

Technical Field

The invention belongs to the technical field of air compressors, and particularly relates to a screw air compressor.

Background

The screw air compressor consistently provides high-quality compressed air for various industries due to the advantages of high efficiency, no maintenance, high reliability and the like. The screw air compressor adopts a pre-set configuration, only needs single power supply connection and compressed air connection, and is internally provided with a cooling system, so that the installation work is greatly simplified.

When present screw air compressor machine is using, the inside screw rod of screw air compressor machine can constantly extrude the air, and then makes the screw rod can produce high temperature after long-time operation, and if not timely the screw rod dispels the heat, the screw rod can take place to warp or produce the crackle after having saved a large amount of heats, and then leads to the screw rod to damage, and current cooling system can't directly cool down the screw rod, and the cooling mode is single, and then leads to cooling system's cooling effect to reduce by a wide margin, influences screw air compressor machine's life.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the screw air compressor, which effectively solves the problems that the conventional screw air compressor cannot directly cool the screw, and the service life of the screw air compressor is influenced due to poor cooling effect caused by single cooling mode.

In order to achieve the purpose, the invention provides the following technical scheme: a screw air compressor comprises a shell, wherein a motor, a transmission mechanism, a screw air compression mechanism and an oil-gas separation box are sequentially arranged at the bottom end inside the shell, an output shaft of the motor is connected with an input shaft of the transmission mechanism, an output shaft of the transmission mechanism is matched and connected with the screw air compression mechanism, the screw air compression mechanism and the oil-gas separation box are matched and connected through an oil-gas mixing pipe and a circulating oil return pipe, an oil return pump and an oil filter are arranged on the circulating oil return pipe, one end, close to the screw air compression mechanism, of the circulating oil return pipe is provided with an oil inlet branch pipe I and an oil inlet branch pipe II which are matched and connected with the screw air compression mechanism, an air inlet cover is arranged at the middle position, close to one end of the motor, of the shell, the air inlet cover is matched and connected with the screw air compression mechanism through an air inlet pipeline, one end of the bottom of the air inlet cover is provided with a plurality of micro fans, the bottom ends of the micro fans are fixedly provided with air-cooled radiating tubes which are inserted into the screw air compression mechanism, an oil inlet branch tube I is inserted into the air-cooled radiating tubes, the middle position of the top end of the oil-gas separation box is fixedly provided with a pressure maintaining valve, the top end of the pressure maintaining valve is provided with a compressed gas discharging tube which is inserted into the shell, the top end of the inside of the shell is fixedly provided with a water cooling box which is sleeved on the circulating oil return tube and the compressed gas discharging tube, one end of the top of the water cooling box is fixedly provided with a water inlet tube which is inserted into the shell, and the water cooling box is connected with the screw air compression mechanism through a water guide tube;

screw rod air-compression mechanism comprises cover shell, screw rod one and screw rod two, and screw rod one and screw rod two are connected respectively in the inside both sides of cover shell, and screw rod one meshes with screw rod two, and the annular water-cooling cavity with the aqueduct intercommunication is seted up to the inside of cover shell, and screw rod one and screw rod two comprise the body of rod and external screw thread, and external screw thread fixed connection is in the surface of the body of rod, and combined type cooling channel has been seted up to the inside of the body of rod, and oil feed branch pipe one and forced air cooling pipe all alternate in the inside one end of combined type cooling channel.

Preferably, the transmission mechanism is composed of a transmission case, a driving gear, a first driven gear and a second driven gear, the driving gear is located on one side inside the transmission case and is fixedly connected with an output shaft of the motor, and the first driven gear and the second driven gear are located on the other side inside the transmission case and are respectively fixedly connected with the first screw and the second screw.

Preferably, the two ends of the first screw and the second screw are respectively connected with the shell in a matching manner through the first bearing and the oil seal, the first screw and the second screw penetrate through the transmission box, and the first screw and the second screw are connected with the transmission box in a matching manner through the plurality of bearings.

Preferably, an oil inlet hole and an air inlet hole are formed in one end of the top of the casing, the oil inlet hole is fixedly connected with the oil inlet branch pipe II, the air inlet hole is fixedly connected with the air inlet pipeline, an water inlet hole is formed in the other end of the top of the casing, the water inlet hole is fixedly connected with the water guide pipe, and a drain pipe which is inserted into the casing and communicated with the annular water cooling cavity is fixedly arranged at one end of the bottom of the casing.

Preferably, a first flow regulating valve is arranged on the first oil inlet branch pipe, and a second flow regulating valve is arranged on the second oil inlet branch pipe.

Preferably, the inside of screw rod one and screw rod two all is provided with the water conservancy diversion line, and the water conservancy diversion line is spiral structure, and the one end that the motor was kept away from to screw rod one and screw rod two all is provided with the cover that looses, and the inside one side of cover that looses is flaring formula structure, and the internal surface of cover that looses is the tilting structure.

Preferably, one end of the first screw and one end of the second screw are provided with an oil gas collecting box which is sleeved on the first screw and the second screw, the oil gas collecting box is connected with the oil gas separating box in a matched mode through an oil gas discharging pipe, an oil pump is arranged on the oil gas discharging pipe, and the oil gas collecting box is connected with the pressure maintaining valve in a matched mode through an exhaust pipe.

Preferably, the oil gas collecting box's inboard side is fixed and is provided with the oil absorption foam layer, and the inside one side of oil gas collecting box is provided with the cotton layer of splashproof that matches with screw rod one and screw rod two phases, and the cotton layer of splashproof is porous structure.

Preferably, the inside of oil-gas separation case is provided with coarse filtration board and fine filtration board, and coarse filtration board and fine filtration board are detachable structure.

Preferably, the one end of air inlet hood is provided with the protection screen panel, and the inside one end of air inlet hood is fixed and is provided with the air inlet fan, and the inside other end of air inlet hood is provided with air filter, and air filter is L type structure.

Compared with the prior art, the invention has the beneficial effects that:

(1) In operation, through being provided with the motor, drive mechanism, screw rod air-compression mechanism, the oil-gas separation case, the circulation returns oil pipe, oil feed branch pipe one, oil feed branch pipe two, the cover that admits air, the pipeline that admits air, the miniature fan, the forced air cooling pipe, the water-cooling case, annular water-cooling cavity, combined type cooling channel can realize the oil cooling to screw rod one and screw rod two, forced air cooling and water-cooling combination formula heat dissipation, can dispel the heat simultaneously to the surface and the inner core of screw rod one and screw rod two, and can carry out the water-cooling heat dissipation to the inside of cover shell, thereby can effectively improve the radiating effect, avoid screw rod one and screw rod two to work and take place the condition of deformation or fracture in high temperature environment for a long time, and then can improve the life of air compressor machine, the filterable function of admitting air has simultaneously, effectively improve the cleanliness factor that admits air, avoid making the pit appear or corroded by the dust in screw rod one and screw rod two surfaces because of dust or small gravel in the air.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

In the drawings:

FIG. 1 is a schematic view of a screw air compressor according to the present invention;

FIG. 2 is a second schematic view of the screw air compressor according to the present invention;

FIG. 3 is a partial enlarged view of FIG. 2 in accordance with the present invention;

FIG. 4 is a second enlarged view of the portion of FIG. 2 according to the present invention;

FIG. 5 is a front cross-sectional view of the screw air compressing mechanism of the present invention;

FIG. 6 is a side view of the screw air compression mechanism of the present invention;

FIG. 7 is a top view of the interior of the screw air compressing mechanism of the present invention;

FIG. 8 is a top cross-sectional view of the screw air compressing mechanism of the present invention;

FIG. 9 is an enlarged view of a portion of FIG. 8 of the present invention;

in the figure: 1. a housing; 2. a motor; 3. a transmission mechanism; 4. a screw air compression mechanism; 5. an oil-gas separation tank; 6. an oil-gas mixing pipe; 7. a circulating oil return pipe; 8. an oil return pump; 9. oil filtration; 10. a first oil inlet branch pipe; 11. an oil inlet branch pipe II; 12. an air intake hood; 13. an air intake line; 14. a micro fan; 15. air-cooled radiating pipes; 16. a pressure maintenance valve; 17. a compressed gas discharge pipe; 18. a water cooling tank; 19. a water inlet pipe; 20. a water conduit; 21. a housing; 22. a first screw rod; 23. a second screw; 24. an annular water-cooled chamber; 25. a rod body; 26. an external thread; 27. a composite cooling channel; 28. a transmission case; 29. a drive gear; 30. a first driven gear; 31. a driven gear II; 32. a first bearing; 33. oil sealing; 34. an oil inlet hole; 35. an air inlet; 36. a water inlet hole; 37. a drain pipe; 38. a first flow regulating valve; 39. a flow regulating valve II; 40. flow guide lines; 41. a flow dispersing cover; 42. an oil gas collecting box; 43. an oil gas discharge pipe; 44. an oil pump; 45. an exhaust pipe; 46. an oil absorbing foam layer; 47. a splash-proof cotton layer; 48. a coarse filter plate; 49. a fine filter plate; 50. a protective mesh enclosure; 51. an air inlet fan; 52. an air screen.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

In the first embodiment, as shown in fig. 1 to 9, the screw air compressor of the present invention includes a casing 1, a motor 2, a transmission mechanism 3, a screw air compression mechanism 4 and an oil-gas separation tank 5 are sequentially disposed at the bottom end inside the casing 1, an output shaft of the motor 2 is connected to an input shaft of the transmission mechanism 3, an output shaft of the transmission mechanism 3 is connected to the screw air compression mechanism 4 in a matching manner, the screw air compression mechanism 4 and the oil-gas separation tank 5 are connected in a matching manner through an oil-gas mixing pipe 6 and a circulation oil return pipe 7, an oil return pump 8 and an oil filter 9 are disposed on the circulation oil return pipe 7, one end of the circulation oil return pipe 7 close to the screw air compression mechanism 4 is provided with an oil inlet branch pipe 1 and an oil inlet branch pipe 11 in a matching connection with the screw air compression mechanism 4, an air inlet cover 12 is disposed at the middle position of one end of the casing 1 close to one end of the motor 2, the air inlet cover 12 is connected to the screw air compression mechanism 4 in a matching manner through an air inlet pipeline 13, one end of the bottom of the air inlet cover 12 is provided with a plurality of micro fans 14, the bottom end of the micro fans 14 is fixedly provided with an air cooling heat dissipation pipe 15 inserted into the screw air compression mechanism 4, a water cooling pipe 17 inserted into the casing 1, a water cooling pipe 17 inserted into the water cooling pipe 17 fixed at the top end of the water cooling mechanism 1, and a water cooling pipe 17 inserted into the water cooling mechanism 1, and a water cooling pipe 17 fixed to maintain the water cooling pipe 17 inserted into the water cooling mechanism 1, and a water cooling pipe 17 inserted into the water cooling tank 1, and a water cooling pipe 17 inserted into the water cooling pipe 17 fixed to maintain the water cooling pipe 17 inserted into the water cooling pipe 1; the screw air compression mechanism 4 comprises a casing 21, a first screw 22 and a second screw 23, the first screw 22 and the second screw 23 are respectively connected to two sides inside the casing 21, the first screw 22 is meshed with the second screw 23, an annular water cooling chamber 24 communicated with the water guide pipe 20 is formed inside the casing 21, the first screw 22 and the second screw 23 are respectively formed by a rod body 25 and an external thread 26, the external thread 26 is fixedly connected to the outer surface of the rod body 25, a composite cooling channel 27 is formed inside the rod body 25, and the oil inlet branch pipe one 10 and the air cooling and heat dissipation pipe 15 are inserted into one end inside the composite cooling channel 27;

when the air compressor works, lubricating oil is in circulation work, the oil return pump 8 extracts the lubricating oil, the lubricating oil is filtered through the oil filter 9, the filtered lubricating oil is guided into the oil inlet branch pipe I10 and the oil inlet branch pipe II 11 through the circulation oil return pipe 7, part of the lubricating oil is guided into the screw rod I22 and the screw rod II 23 through the oil inlet branch pipe I10, oil cooling heat dissipation is conducted on inner cores of the screw rod I22 and the screw rod II 23, the other part of the lubricating oil is guided into the casing 21 through the oil inlet branch pipe II 11, external surface heat dissipation and lubrication are conducted on the screw rod I22 and the screw rod II 23 through the lubricating oil, meanwhile, the sealing effect is achieved, air backflow is avoided, the lubricating oil in the casing 21 is discharged into the oil-gas separation box 5 through the oil-gas mixing pipe 6 synchronously along with air after use, the lubricating oil falls into the bottom of the oil-gas separation box 5, compressed air is discharged through the pressure maintaining valve 16 and the compressed air discharge pipe 17, the lubricating oil in the screw rod I22 and the screw rod II 23 is discharged into the oil-gas collection box 42 after use, and then is discharged into the oil-gas separation box 5 through the oil pump 44; the air compressor is used for feeding air through the air inlet cover 12, the air enters the interior of the screw air compression mechanism 4 through the air inlet pipeline 13 to be compressed, part of the air is discharged into the composite cooling channel 27 of the first screw 22 and the second screw 23 through the micro fan 14 and the air-cooled radiating pipe 15, the air and lubricating oil simultaneously flow in the composite cooling channel 27, so that oil cooling and air cooling heat dissipation is carried out on the interior of the first screw 22 and the second screw 23, and then the air is discharged into the interior of the pressure maintaining valve 16 through the exhaust pipe 45 or directly discharged into the outside air; the cooling water enters the water cooling tank 18 through the water inlet pipe 19, the circulating oil return pipe 7 and the compressed gas discharge pipe 17 are cooled through the cooling water, and then the cooling water enters the annular water cooling chamber 24 through the water guide pipe 20, so that the jacket 21 is cooled, and the cooling effect is effectively improved.

In the second embodiment, as shown in fig. 1 to 9, the transmission mechanism 3 is composed of a transmission case 28, a driving gear 29, a first driven gear 30 and a second driven gear 31, the driving gear 29 is located on one side inside the transmission case 28 and is fixedly connected with the output shaft of the motor 2, the first driven gear 30 and the second driven gear 31 are located on the other side inside the transmission case 28 and are respectively fixedly connected with the first screw 22 and the second screw 23, two ends of the first screw 22 and the second screw 23 are respectively connected with the housing 1 through a first bearing 32 and an oil seal 33 in a matching manner, the first screw 22 and the second screw 23 both penetrate through the transmission case 28, and the first screw 22 and the second screw 23 are respectively connected with the transmission case 28 through a plurality of second bearings in a matching manner;

the motor 2 drives the driving gear 29 to rotate, the driving gear 29 drives the first driven gear 30 and the second driven gear 31 to rotate, the first screw rod 22 and the second screw rod 23 can be driven to rotate, air compression is achieved, mobility and connection tightness of the first screw rod 22 and the second screw rod 23 can be improved through the first bearing 32 and the oil seal 33, and oil leakage is avoided.

In the third embodiment, as shown in fig. 1 to 9, an oil inlet 34 and an air inlet 35 are formed at one end of the top of the casing 21, the oil inlet 34 is fixedly connected with the second oil inlet branch pipe 11, the air inlet 35 is fixedly connected with the air inlet pipeline 13, an water inlet 36 is formed at the other end of the top of the casing 21, the water inlet 36 is fixedly connected with the water conduit 20, a water outlet pipe 37 inserted into the casing 1 and communicated with the annular water cooling chamber 24 is fixedly arranged at one end of the bottom of the casing 1, a first flow regulating valve 38 is arranged on the first oil inlet branch pipe 10, a second flow regulating valve 39 is arranged on the second oil inlet branch pipe 11, flow guiding grains 40 are arranged inside the first screw 22 and the second screw 23, the flow guiding grains 40 are of a spiral structure, a flow dispersing cover 41 is arranged at one ends of the first screw 22 and the second screw 23 away from the motor 2, a flared structure is arranged at one side inside the flow dispersing cover 41, and an inner surface of the flow dispersing cover 41 is of an inclined structure;

the flow of lubricating oil in the first oil inlet branch pipe 10 and the flow of lubricating oil in the second oil inlet branch pipe 11 can be respectively adjusted through the first flow adjusting valve 38 and the second flow adjusting valve 39, the flow guide lines 40 can drive the lubricating oil to continuously move towards one end, the flow stabilizing effect can be improved, turbulence is avoided, the discharging effect of the lubricating oil can be improved through the flow scattering cover 41, and the lubricating oil is prevented from flowing backwards along the outer surfaces of the first screw rod 22 and the second screw rod 23.

In the fourth embodiment, as shown in fig. 1 to 9, an oil-gas collection box 42 sleeved on the first screw 22 and the second screw 23 is disposed at one end of the first screw 22 and the second screw 23, the oil-gas collection box 42 is connected with the oil-gas separation box 5 through an oil-gas discharge pipe 43 in a matching manner, an oil pump 44 is disposed on the oil-gas discharge pipe 43, the oil-gas collection box 42 is connected with the pressure maintenance valve 16 through an exhaust pipe 45 in a matching manner, an oil-absorbing foam layer 46 is fixedly disposed on an inner side of the oil-gas collection box 42, a splash-proof cotton layer 47 matched with the first screw 22 and the second screw 23 is disposed on one side of the inside of the oil-gas collection box 42, the splash-proof cotton layer 47 is a porous structure, a coarse filter plate 48 and a fine filter plate 49 are disposed inside the oil-gas separation box 5, the coarse filter plate 48 and the fine filter plate 49 are both of a detachable structure, a protective mesh enclosure 50 is disposed at one end of the air inlet hood 12, an inlet fan 51 is fixedly disposed at one end of the air inlet hood 12, an air screen 52 is disposed at the other end of the air inlet hood 12, and the air screen 52 is an L-shaped structure;

be convenient for discharge the inside lubricating oil of oil gas discharge pipe 43 into the inside of oil-gas separation case 5 through oil pump 44, can improve the oil absorption effect through oil absorption foam blanket 46 and splash proof cotton layer 47, avoid lubricating oil to take place to splash, avoid the air reflux simultaneously, can prefilter lubricating oil through coarse filtration board 48 and fine filtration board 49, improve the filter effect of lubricating oil, can improve the security of air inlet through protective screen panel 50, avoid impurity to get into simultaneously, can realize the purification to admitting air through air filter 52, avoid impurity to get into and influence the life-span of screw rod one 22 and screw rod two 23.

In operation, through being provided with the motor, drive mechanism, screw rod air compression mechanism, the oil-gas separation case, the circulation returns oil pipe, oil feed branch pipe one, oil feed branch pipe two, the cover that admits air, the air inlet pipeline, the micro-fan, the forced air cooling pipe, the water-cooling case, annular water-cooling cavity, combined type cooling channel can realize the oil cooling to screw rod one and screw rod two, air-cooling and water-cooling combination formula heat dissipation, can dispel the heat simultaneously to the surface and the inner core of screw rod one and screw rod two, and can carry out water-cooling heat dissipation to the inside of cover shell, thereby can effectively improve the radiating effect, avoid screw rod one and screw rod two to work for a long time and take place the condition of warping or fracture in high temperature environment, and then can improve the life of air compressor machine, the filterable function of admitting air has simultaneously, effectively improve the cleanliness factor of admitting air, avoid making screw rod one and screw rod two surfaces pit appear or corroded by the dust because of dust in the air or small gravel.

Claims

1. The utility model provides a screw compressor, includes casing (1), its characterized in that: the cooling device is characterized in that a motor (2), a transmission mechanism (3), a screw air pressing mechanism (4) and an oil-gas separation box (5) are sequentially arranged at the bottom end inside a shell (1), an output shaft of the motor (2) is connected with an input shaft of the transmission mechanism (3), an output shaft of the transmission mechanism (3) is connected with the screw air pressing mechanism (4) in a matched mode, the screw air pressing mechanism (4) and the oil-gas separation box (5) are connected in a matched mode through an oil-gas mixing pipe (6) and a circulating oil return pipe (7), an oil return pump (8) and an oil filter (9) are arranged on the circulating oil return pipe (7), one end, close to the screw air pressing mechanism (4), of the circulating oil return pipe (7) is provided with an oil inlet branch pipe I (10) and an oil inlet branch pipe II (11) which are connected with the screw air pressing mechanism (4) in a matched mode, the middle position of one end, close to the motor (2), of the shell (1) is provided with an air inlet cover (12), the air inlet cover (12) is arranged at the middle position, the air cover (12) is connected with the screw air pressing mechanism (4) in a cooling pipe (15) in a fixed mode, a cooling pipe (14) is arranged at the bottom end of the air cooling pipe (14), an air cooling pipe (15) inserted into the air pressing mechanism (5), and a cooling pipe (15) inserted into the air cooling pipe (15) and is arranged inside the air cooling pipe (5), and is arranged inside the air cooling pipe (15), and is arranged inside the air cooling pipe (5), and is arranged inside the air cooling pipe (15) and is arranged, and is fixed in the air cooling pipe (15) and is arranged inside the air cooling pipe (5), and the air cooling pipe (10) and is arranged inside the air cooling pipe (5), the air cooling mechanism (15) is arranged, and the air cooling pipe (5), and is arranged inside the air cooling pipe (4), the air cooling pipe (10) is arranged inside the air cooling pipe (5) ) A compressed gas discharge pipe (17) inserted in the shell (1) is arranged at the top end of the pressure maintaining valve (16), a water cooling tank (18) sleeved on the circulating oil return pipe (7) and the compressed gas discharge pipe (17) is fixedly arranged at the top end inside the shell (1), a water inlet pipe (19) inserted in the shell (1) is fixedly arranged at one end of the top of the water cooling tank (18), and the water cooling tank (18) is connected with the screw air compression mechanism (4) through a water guide pipe (20);

screw rod air-compressing mechanism (4) is by cover shell (21), screw rod (22) and screw rod two (23) constitute, screw rod (22) and screw rod two (23) are connected respectively in the inside both sides of cover shell (21), screw rod (22) and screw rod two (23) mesh mutually, annular water-cooling cavity (24) with aqueduct (20) intercommunication are seted up to the inside of cover shell (21), screw rod (22) and screw rod two (23) constitute by body of rod (25) and external screw thread (26), external screw thread (26) fixed connection is in the surface of body of rod (25), combined type cooling channel (27) have been seted up to the inside of body of rod (25), oil feed branch pipe (10) and air-cooled cooling pipe (15) all alternate in the inside one end of combined type cooling channel (27).

2. The screw air compressor of claim 1, wherein: the transmission mechanism (3) is composed of a transmission case (28), a driving gear (29), a first driven gear (30) and a second driven gear (31), the driving gear (29) is located on one side inside the transmission case (28) and fixedly connected with an output shaft of the motor (2), and the first driven gear (30) and the second driven gear (31) are located on the other side inside the transmission case (28) and fixedly connected with the first screw rod (22) and the second screw rod (23) respectively.

3. The screw air compressor of claim 2, wherein: the two ends of the first screw rod (22) and the second screw rod (23) are respectively matched and connected with the shell (1) through a first bearing (32) and an oil seal (33), the first screw rod (22) and the second screw rod (23) penetrate through the transmission case (28), and the first screw rod (22), the second screw rod (23) and the transmission case (28) are respectively matched and connected through a plurality of bearings.

4. The screw air compressor of claim 1, wherein: oil inlet hole (34) and inlet port (35) have been seted up to the one end at cover shell (21) top, oil inlet hole (34) and oil feed branch pipe two (11) fixed connection, inlet port (35) and air inlet pipeline (13) fixed connection, inlet opening (36) have been seted up to the other end at cover shell (21) top, inlet opening (36) and aqueduct (20) fixed connection, the one end of casing (1) bottom is fixed to be provided with and alternates in casing (1) and with drain pipe (37) of annular water-cooling cavity (24) intercommunication.

5. The screw air compressor of claim 1, wherein: and a first flow regulating valve (38) is arranged on the first oil inlet branch pipe (10), and a second flow regulating valve (39) is arranged on the second oil inlet branch pipe (11).

6. The screw air compressor of claim 1, wherein: the inside of screw rod (22) and screw rod two (23) all is provided with water conservancy diversion line (40), and water conservancy diversion line (40) are spiral structure, and the one end that motor (2) were kept away from in screw rod (22) and screw rod two (23) all is provided with scattered class cover (41), and one side of scattered class cover (41) inside is flaring formula structure, and the internal surface that scatters class cover (41) is the tilting structure.

7. The screw air compressor of claim 1, wherein: one end of the first screw rod (22) and one end of the second screw rod (23) are provided with oil gas collecting boxes (42) sleeved on the first screw rod (22) and the second screw rod (23), the oil gas collecting boxes (42) and the oil gas separation box (5) are connected in a matched mode through oil gas discharge pipes (43), oil pumps (44) are arranged on the oil gas discharge pipes (43), and the oil gas collecting boxes (42) and the pressure maintaining valve (16) are connected in a matched mode through exhaust pipes (45).

8. The screw air compressor of claim 7, wherein: an oil absorption foam layer (46) is fixedly arranged on the inner side edge of the oil and gas collecting box (42), an anti-splash cotton layer (47) matched with the first screw rod (22) and the second screw rod (23) is arranged on one side of the inner portion of the oil and gas collecting box (42), and the anti-splash cotton layer (47) is of a porous structure.

9. The screw air compressor of claim 1, wherein: the inside of oil-gas separation case (5) is provided with coarse filtration board (48) and fine filtration board (49), and coarse filtration board (48) and fine filtration board (49) are detachable structure.

10. The screw air compressor of claim 1, wherein: the air inlet hood is characterized in that a protective net cover (50) is arranged at one end of the air inlet hood (12), an air inlet fan (51) is fixedly arranged at one end of the interior of the air inlet hood (12), an air filter screen (52) is arranged at the other end of the interior of the air inlet hood (12), and the air filter screen (52) is of an L-shaped structure.