Screw compressor

Abstract

A screw compressor comprises a driving source and a main machine, the main machine comprises a main machine shell, a main shaft, a male rotor and a female rotor, an air inlet and an air outlet are formed in the main machine shell, a compression cavity and an oil cavity are further formed in the main machine shell, the male rotor and the female rotor are installed in the compression cavity, one end of the main shaft is connected with the driving source, and the other end of the main shaft is connected with the male rotor or the female rotor. An oil pump is further arranged in the main machine shell and located on the main shaft, an oil cavity cooling air duct communicated with an air inlet of the main machine shell and an air inlet area of the compression cavity is arranged in the oil cavity, an exhaust opening of the main machine shell is communicated with an exhaust area of the compression cavity, an oil inlet of the oil pump is communicated with the oil cavity, and an oil outlet of the oil pump is communicated with an oil way distribution system in the main machine shell. And the lubricating oil supply system is used for supplying cooled lubricating oil to the oil-way distribution system. According to the screw compressor, external accessories of a main machine are reduced, the overall structure is simpler and more compact, the occupied space is small, and cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field, concretely relates to a screw compressor. BACKGROUND

[0002] The screw compressor comprises a driving source and a main machine, the driving source is generally a motor, and the main machine comprises a main machine shell, a main shaft, a male rotor and a female rotor. The male rotor and the female rotor are rotatably installed in the main machine shell through an air inlet end bearing assembly and an air outlet end bearing assembly. One end of the main shaft is connected with the driving source, and the other end is generally connected with the male rotor or the female rotor through a first gear assembly. For an oil-free screw compressor, since the male rotor and the female rotor have a certain gap therebetween, a second gear assembly for synchronously rotating the male rotor and the female rotor needs to be additionally arranged therebetween compared with an oil-injected screw compressor. The bearing assembly and the gear assembly need to be lubricated and cooled for both the oil-injected screw compressor and the oil-free screw compressor.

[0003] The Chinese utility model patent with the authorization announcement number CN219101582U discloses a screw compressor, which realizes the lubrication and cooling of the bearing assembly and the gear assembly through an external oil tank, an oil pump and a cooling system. During use, the oil pump pumps the lubricating oil in the oil tank into the cooling system, the lubricating oil cooled by the cooling system is delivered to the screw compressor, the bearing assembly and the gear assembly in the screw compressor are lubricated and cooled, and the lubricating oil after passing through the bearing assembly and the gear assembly is returned to the oil tank for recycling.

[0004] However, the existing screw compressor has the following technical problems: the external oil tank, the oil pump and the cooling system result in more external accessories of the main machine, the overall structure is not simple and compact, the occupied space is large, and the cost is high. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem that a screw compressor with fewer external accessories of the main machine, a simpler and more compact overall structure, a smaller occupied space and a lower cost is provided.

[0006] The technical solution of the utility model is as follows: a screw compressor comprises a driving source and a main machine, the main machine comprises a main machine shell, a main shaft, a male rotor and a female rotor, an air inlet and an air outlet are arranged on the main machine shell, a compression cavity and an oil cavity are further arranged in the main machine shell, the male rotor and the female rotor are installed in the compression cavity, one end of the main shaft is connected with the driving source and the other end is connected with the male rotor or the female rotor, an oil pump is further arranged in the main machine shell and located on the main shaft, an oil cavity cooling air duct for connecting an air inlet of the main machine shell and an air inlet area of the compression cavity is arranged in the oil cavity, an air outlet of the main machine shell is in communication with an air outlet area of the compression cavity, an oil inlet of the oil pump is in communication with the oil cavity, an oil outlet of the oil pump is in communication with an oil distribution system in the main machine shell, and the oil distribution system is provided with cooled lubricating oil.

[0007] With the above structure, the utility model has the following advantages:

[0008] The oil cavity and the oil pump are arranged in the main shell, the oil pump is directly driven by the main shaft, no additional driving device of the oil pump is needed, the cooling of the lubricating oil in the oil cavity directly uses the intake of the main machine, no additional cooling system of the lubricating oil is needed, and only the oil cavity cooling air duct needs to be arranged in the oil cavity, so that the above-mentioned setting greatly reduces the external accessories of the main machine, the overall structure is more simple and compact, the occupied space is small, and the cost is low.

[0009] As preferred, the cooling oil pipe arranged outside the main shell, the lubricating oil outlet and the lubricating oil inlet arranged on the main shell, the oil outlet of the oil pump is communicated with the lubricating oil outlet, the cooling oil pipe is arranged through the air inlet of the main shell and the two ends are communicated with the lubricating oil outlet and the lubricating oil inlet respectively, and the lubricating oil inlet is communicated with the oil distribution system. The setting first leads the lubricating oil pumped out by the oil pump to the outside of the main shell through the external cooling oil pipe, and then further cools the lubricating oil in the cooling oil pipe by using the low-temperature air at the air inlet of the main shell, and then transports the lubricating oil to the main shell to provide the lubricating oil for the components to be cooled by the oil distribution system. Since the lubricating oil is not only cooled in the oil cavity, but also further cooled after being pumped out by the oil pump, the cooling effect is better and more uniform.

[0010] As preferred, the oil filter arranged outside the main shell, the oil outlet of the oil pump is communicated with the lubricating oil outlet through the oil filter. The setting uses the oil filter to remove impurities from the lubricating oil, so that the lubricating oil can be recycled, and the oil filter is external, which is convenient for cleaning impurities.

[0011] As preferred, the cooling oil pipe includes a front cooling oil pipe and a rear cooling oil pipe, one end of the front cooling oil pipe is communicated with the lubricating oil outlet and the other end is inserted into the air inlet of the main shell, one end of the rear cooling oil pipe is communicated with the lubricating oil inlet and the other end is also inserted into the air inlet of the main shell, and the one end of the front cooling oil pipe and the rear cooling oil pipe inserted into the air inlet of the main shell is communicated through a spiral pipe structure. The spiral pipe structure can increase the heat dissipation area and prolong the residence time of the lubricating oil in the air inlet, and the lubricating oil has good heat dissipation and cooling effect.

[0012] As preferred, the spiral pipeline structure comprises a first spiral pipe and a second spiral pipe arranged coaxially inside and outside, one end of the first spiral pipe communicates with one end of the second spiral pipe, and the other end of the two respectively communicates with one end of the pre-cooling oil pipe and the post-cooling oil pipe extending into the air inlet of the main shell. The spiral pipeline structure is arranged in two circles inside and outside, further increases the heat dissipation area and prolongs the residence time of the lubricating oil in the air inlet, the lubricating oil has better heat dissipation and cooling effect, and the coaxial arrangement of the two spiral structures inside and outside occupies small space and has compact structure.

[0013] As preferred, the compression cavity is provided with an air inlet end bearing assembly on one side and an air outlet end bearing assembly on the other side, the male rotor and the female rotor are rotatably installed in the compression cavity through the air inlet end bearing assembly and the air outlet end bearing assembly, and the output of the oil distribution system communicates with the air inlet end bearing assembly and the air outlet end bearing assembly. The arrangement can lubricate and cool the air inlet end bearing assembly and the air outlet end bearing assembly.

[0014] As preferred, a first gear cavity is arranged in the main shell and located at the side of the compression cavity close to the air inlet end bearing assembly, the driving source is arranged on the side of the main shell close to the first gear cavity, a first gear assembly connecting the main shaft with the male rotor or the female rotor is arranged in the first gear cavity, and the output of the oil distribution system also communicates with the first gear assembly. The arrangement can lubricate and cool the first gear assembly.

[0015] As preferred, the oil cavity is arranged below the compression cavity, the bottom of the first gear cavity communicates with the oil cavity, so that the lubricating oil in the first gear cavity flows back to the oil cavity. The arrangement realizes recycling of the lubricating oil in the first gear cavity.

[0016] As preferred, a second gear cavity is arranged in the main shell and located at the side of the compression cavity close to the air outlet end bearing assembly, a second gear assembly connecting the male rotor and the female rotor to rotate synchronously is arranged in the second gear cavity, and the output of the oil distribution system also communicates with the second gear assembly. The arrangement is suitable for oil-free screw compressors, and can lubricate and cool the second gear assembly of the synchronous male rotor and the female rotor.

[0017] As preferred, the oil cavity is arranged below the compression cavity, the bottom of the second gear cavity communicates with the oil cavity, so that the lubricating oil in the second gear cavity flows back to the oil cavity. The arrangement realizes recycling of the lubricating oil in the second gear cavity. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic view of the screw compressor of the utility model;

[0019] Figure 2 It is a front view of the screw compressor of the utility model;

[0020] Figure 3 Figure 3 is a rear view of the screw compressor of the present application;

[0021] Figure 4 Figure 4 is a top view of the screw compressor of the present application;

[0022] Figure 5 Figure 5 is a sectional view along A-A' of the screw compressor of the present application; Figure 4

[0023] Figure 6 is a sectional view along B-B' of the screw compressor of the present application; Figure 6 Figure 4 Figure 7 is a sectional view along C-C' of the screw compressor of the present application (with the male rotor and the female rotor hidden);

[0024] Figure 7 Figure 8 is a front view of the screw compressor of the present application with the hidden hose;

[0025] Figure 8 Figure 7 Figure 9 is a local enlarged view of D of the screw compressor of the present application;

[0026] Figure 9 Figure 10 is a schematic view of the cooperation of the oil pipe before cooling, the oil pipe after cooling and the spiral duct structure of the present application;

[0027] Figure 10 Figure 11 is a schematic view of the cooperation of the oil pipe before cooling, the oil pipe after cooling and the spiral duct structure of the present application;

[0028] Figure 11 Figure 12 is a local enlarged view of D of the screw compressor of the present application; Figure 10

[0029] Figure 1: 1 - driving source, 2 - main machine, 3 - main machine shell, 4 - main shaft, 5 - male rotor, 6 - female rotor, 7 - air inlet of the main machine shell, 8 - air outlet of the main machine shell, 9 - compression cavity, 10 - oil cavity, 11 - oil pump, 12 - oil cavity cooling air duct, 13 - cooling oil pipe, 14 - lubricating oil outlet, 15 - lubricating oil inlet, 16 - oil filter, 17 - oil pipe before cooling, 18 - oil pipe after cooling, 19 - spiral duct structure, 20 - first spiral pipe, 21 - second spiral pipe, 22 - air inlet end bearing assembly, 23 - air outlet end bearing assembly, 24 - first gear cavity, 25 - first gear assembly, 26 - second gear cavity, 27 - second gear assembly, 28 - oil inlet of the oil pump, 29 - air filter, 30 - motor shell, 31 - stator, 32 - rotor, 33 - cover shell, 34 - motor cooling air duct, 35 - air outlet of the air filter, 36 - air inlet of the motor cooling air duct, 37 - air outlet of the motor cooling air duct, 38 - oil outlet of the oil pump, 39 - hose. DETAILED DESCRIPTION

[0030] The present application will be further described below in conjunction with the drawings and examples. ​​​

[0031] Example:

[0032] like Figures 1-11 As shown, a screw compressor includes a driving source 1 and a main unit 2, and the main unit 2 includes a main unit housing 3, a main shaft 4, a male rotor 5 and a female rotor 6. The main unit housing 3 is provided with an air inlet 7 and an exhaust port 8. The main unit housing 3 is also provided with a compression chamber 9 and an oil chamber 10. The male rotor 5 and the female rotor 6 are installed in the compression chamber 9. One end of the main shaft 4 is connected to the driving source 1 and the other end is connected to the male rotor 5 or the female rotor 6. An oil pump 11 is also provided in the main unit housing 3 and on the main shaft 4. An oil chamber cooling duct 12 is provided in the oil chamber 10, which connects the air inlet 7 of the main unit housing 3 and the air inlet area of ​​the compression chamber 9. The exhaust port 8 of the main unit housing 3 is connected to the exhaust area of ​​the compression chamber 9. The oil inlet 28 of the oil pump 11 is connected to the oil chamber 10, and the oil outlet 38 of the oil pump 11 is connected to the oil distribution system in the main unit housing 3, for providing cooled lubricating oil to the oil distribution system.

[0033] In the screw compressor of this embodiment, the oil chamber 10 and the oil pump 11 are built into the main unit housing 3. The oil pump 11 is directly driven by the main shaft 4, and there is no need to provide an additional drive device for the oil pump 11. The cooling of the lubricating oil in the oil chamber 10 directly utilizes the intake air of the main unit 2 itself, and there is no need to provide an additional lubricating oil cooling system. Instead, it is only necessary to arrange an oil chamber cooling duct 12 in the oil chamber 10. Therefore, the above arrangement greatly reduces the external accessories of the main unit 2, and the overall structure is simpler and more compact, occupies less space, and is low in cost.

[0034] The system also includes a cooling oil pipe 13 disposed outside the main housing 3, and a lubricating oil outlet 14 and a lubricating oil inlet 15 disposed on the main housing 3. The oil outlet 38 of the oil pump 11 is connected to the lubricating oil outlet 14. The cooling oil pipe 13 passes through the air inlet 7 of the main housing 3 and is connected to the lubricating oil outlet 14 and the lubricating oil inlet 15 at both ends. The lubricating oil inlet 15 is connected to the oil distribution system. This arrangement first leads the lubricating oil pumped out by the oil pump 11 to the outside of the main housing 3 through the external cooling oil pipe 13, and uses the low-temperature air at the air inlet 7 of the main housing 3 to further cool the lubricating oil in the cooling oil pipe 13. The lubricating oil is then transported to the main housing 3 through the oil distribution system to provide lubricating oil to the components to be cooled and lubricated. Since the lubricating oil is not only cooled in the oil chamber 10, but also further cooled after being pumped out by the oil pump 11, the cooling effect is better and more uniform.

[0035] The oil filter 16 is also provided outside the main body housing 3. The oil outlet 38 of the oil pump 11 is connected to the lubricating oil outlet 14 through the oil filter 16. This arrangement uses the oil filter 16 to remove impurities from the lubricating oil, thereby ensuring the purity of the lubricating oil so that it can be recycled. The external placement of the oil filter 16 facilitates the removal of impurities.

[0036] The cooling oil pipe 13 comprises a cooling front oil pipe 17 and a cooling rear oil pipe 18, one end of the cooling front oil pipe 17 is communicated with the lubricating oil outlet 14 and the other end extends into the air inlet 7 of the main engine casing 3, one end of the cooling rear oil pipe 18 is communicated with the lubricating oil inlet 15 and the other end also extends into the air inlet 7 of the main engine casing 3, and the cooling front oil pipe 17 and the cooling rear oil pipe 18 extending into the air inlet 7 of the main engine casing 3 are communicated through a spiral pipe structure 19. The spiral pipe structure 19 can increase the heat dissipation area and prolong the residence time of the lubricating oil in the air inlet 7, and the lubricating oil has good heat dissipation and cooling effect.

[0037] The spiral pipe structure 19 comprises a first spiral pipe 20 and a second spiral pipe 21 arranged coaxially inside and outside, one end of the first spiral pipe 20 is communicated with one end of the second spiral pipe 21, and the other ends of the two are communicated with the ends of the cooling front oil pipe 17 and the cooling rear oil pipe 18 extending into the air inlet 7 of the main engine casing 3. The spiral pipe structure 19 is arranged in two circles inside and outside, further increasing the heat dissipation area and prolonging the residence time of the lubricating oil in the air inlet, and the lubricating oil has better heat dissipation and cooling effect, and the coaxial arrangement of the two spiral structures inside and outside occupies small space and has compact structure.

[0038] The compression chamber 9 is provided with an air inlet end bearing assembly 22 on one side and an air outlet end bearing assembly 23 on the other side, the male rotor 5 and the female rotor 6 are rotatably installed in the compression chamber 9 through the air inlet end bearing assembly 22 and the air outlet end bearing assembly 23, and the output of the oil distribution system is communicated with the air inlet end bearing assembly 22 and the air outlet end bearing assembly 23; in this embodiment, the cooperation structure of the air inlet end bearing assembly 22 and the air outlet end bearing assembly 23 with the male rotor 5 and the female rotor 6 adopts the prior art. This arrangement can lubricate and cool the air inlet end bearing assembly 22 and the air outlet end bearing assembly 23.

[0039] A first gear cavity 24 is arranged in the main engine casing 3 and located on the side of the compression chamber 9 close to the air inlet end bearing assembly 22, one side of the air inlet end bearing assembly 22 is communicated with the first gear cavity 24, the driving source 1 is arranged on the side of the main engine casing 3 close to the first gear cavity 24, the first gear cavity 24 is provided with a first gear assembly 25 connecting the main shaft 4 with the male rotor 5 or the female rotor 6, and the output of the oil distribution system is also communicated with the first gear assembly 25, and the first gear assembly 25 adopts the prior art. This arrangement can lubricate and cool the first gear assembly 25.

[0040] The second gear cavity 26 is arranged in the main machine shell 3 and located at the side of the compression cavity 9 close to the exhaust end bearing assembly 23, the side of the exhaust end bearing assembly 23 is communicated with the second gear cavity 26, the second gear cavity 26 is provided with the second gear assembly 27 for connecting the male rotor 5 and the female rotor 6 to make them rotate synchronously, and the output of the oil distribution system is also communicated with the second gear assembly 27. The second gear assembly 27 can be realized by using the prior art. The setting is suitable for the oil-free screw compressor, and the second gear assembly 27 of the synchronous male rotor 5 and female rotor 6 can be lubricated and cooled.

[0041] The oil cavity 10 is arranged below the compression cavity 9, the bottom of the first gear cavity 24 is communicated with the oil cavity 10, and the lubricating oil in the first gear cavity 24 is returned to the oil cavity 10. Since the first gear assembly 25 is arranged in the first gear cavity 24 and the side of the intake end bearing assembly 22 is also communicated with the first gear cavity 24, the lubricating oil of the first gear assembly 25 and the intake end bearing assembly 22 is recycled in the first gear cavity 24. The setting realizes the recycling of the lubricating oil in the first gear cavity 24.

[0042] The bottom of the second gear cavity 26 is communicated with the oil cavity 10, and the lubricating oil in the second gear cavity 26 is returned to the oil cavity 10. Since the second gear assembly 27 is arranged in the second gear cavity 26 and the side of the exhaust end bearing assembly 23 is also communicated with the second gear cavity 26, the lubricating oil of the second gear assembly 27 and the exhaust end bearing assembly 23 is recycled in the second gear cavity 26. The setting realizes the recycling of the lubricating oil in the second gear cavity 26.

[0043] In the embodiment, the air filter 29 is further included, the driving source 1 includes the motor shell 30, the stator 31 fixedly arranged in the motor shell 30, and the rotor 32 rotatably arranged in the stator 31, the main shaft 4 is directly connected with the rotor 32, the cover shell 33 is further sleeved outside the motor shell 30, the motor cooling air duct 34 is arranged between the cover shell 33 and the motor shell 30, for cooling the motor, the exhaust port 35 of the air filter 29 is communicated with the air inlet 36 of the motor cooling air duct 34, and the exhaust port 37 of the motor cooling air duct 34 is communicated with the air inlet 7 of the main machine shell 3 through the hose 39.

[0044] The lubricating and cooling process of the screw compressor in the embodiment is as follows:

[0045] The driving source 1 drives the main shaft 4 to rotate. Assuming that the main shaft 4 is connected with the male rotor 5 through the first gear assembly 25, the male rotor 5 rotates, and the male rotor 5 rotates to drive the female rotor 6 to rotate through the second gear assembly 27. When the male rotor 5 and the female rotor 6 operate, strong negative pressure is generated, so that low-temperature air is sucked from the outside through the air filter 29. The sucked low-temperature air first cools the motor through the motor cooling air duct 34, and then cools the oil cavity 10 in the main shell 3 through the oil cavity cooling air duct 12, and then the intake enters the compression cavity 9 and is compressed by the male rotor 5 and the female rotor 6. Finally, the compressed gas is discharged from the exhaust port 8 of the main shell 3. At the same time, the rotation of the main shaft 4 also drives the oil pump 11 to work. The oil pump 11 sucks the lubricating oil in the oil cavity 10 through the oil suction channel 28, and then pumps out the lubricating oil through the oil outlet 38 of the oil pump 11. The lubricating oil pumped out by the oil pump 11 is first removed by the external oil filter 16, and then introduced to the air inlet 7 of the main shell 3 through the external cooling oil pipe 13. The low-temperature intake is used to further cool the lubricating oil in the cooling oil pipe 13, and finally delivered to the main shell 3 through the oil distribution system to lubricate and cool the air inlet bearing assembly 22, the exhaust end bearing assembly 23, the first gear assembly 25 and the second gear assembly 27. The first gear cavity 24 recovers the lubricating oil of the air inlet bearing assembly 22 and the first gear assembly 25 and returns to the oil cavity 10 through the bottom for reuse, and the second gear cavity 26 recovers the lubricating oil of the exhaust end bearing assembly 23 and the second gear assembly 27 and returns to the oil cavity 10 through the bottom for reuse.

Claims

1. A screw compressor comprising a driving source (1) and a main machine (2), the main machine (2) comprising a main machine housing (3), a main shaft (4), a male rotor (5) and a female rotor (6), the main machine housing (3) being provided with an air inlet (7) and an air outlet (8), characterized in that: The main shell (3) is further provided with a compression cavity (9) and an oil cavity (10), the male rotor (5) and the female rotor (6) are installed in the compression cavity (9), one end of the main shaft (4) is connected with the driving source (1) and the other end is connected with the male rotor (5) or the female rotor (6), the main shell (3) is further provided with an oil pump (11) on the main shaft (4), the oil cavity (10) is provided with an oil cavity cooling air duct (12) which is connected with the air inlet (7) of the main shell (3) and the air inlet area of the compression cavity (9), the air outlet (8) of the main shell (3) is connected with the air outlet area of the compression cavity (9), the oil inlet (28) of the oil pump (11) is connected with the oil cavity (10), and the oil outlet (38) of the oil pump (11) is connected with the oil distribution system in the main shell (3) to provide cooled lubricating oil to the oil distribution system.

2. Screw compressor according to claim 1, characterized in that The cooling oil pipe (13) is arranged outside the main shell (3), and the lubricating oil outlet (14) and the lubricating oil inlet (15) are arranged on the main shell (3), the oil outlet (38) of the oil pump (11) is connected with the lubricating oil outlet (14), the cooling oil pipe (13) passes through the air inlet (7) of the main shell (3) and is connected with the lubricating oil outlet (14) and the lubricating oil inlet (15) at both ends, and the lubricating oil inlet (15) is connected with the oil distribution system.

3. Screw compressor according to claim 2, characterized in that The oil filter (16) is arranged outside the main shell (3), and the oil outlet (38) of the oil pump (11) is connected with the lubricating oil outlet (14) through the oil filter (16).

4. A screw compressor according to claim 2, characterized in that: The cooling oil pipe (13) comprises a pre-cooling oil pipe (17) and a post-cooling oil pipe (18), one end of the pre-cooling oil pipe (17) is connected with the lubricating oil outlet (14) and the other end extends into the air inlet (7) of the main shell (3), one end of the post-cooling oil pipe (18) is connected with the lubricating oil inlet (15) and the other end also extends into the air inlet (7) of the main shell (3), and the pre-cooling oil pipe (17) and the post-cooling oil pipe (18) are connected through a spiral pipe structure (19) at the ends extending into the air inlet (7) of the main shell (3).

5. Screw compressor according to claim 4, characterized in that The spiral pipe structure (19) comprises a first spiral pipe (20) and a second spiral pipe (21) arranged coaxially inside and outside, one end of the first spiral pipe (20) is connected with one end of the second spiral pipe (21), and the other ends of the two are connected with the ends of the pre-cooling oil pipe (17) and the post-cooling oil pipe (18) extending into the air inlet (7) of the main shell (3).

6. A screw compressor as claimed in claim 1, characterized in that: The compression cavity (9) is provided with an air inlet end bearing assembly (22) on one side and an air outlet end bearing assembly (23) on the other side, the male rotor (5) and the female rotor (6) are rotatably installed in the compression cavity (9) through the air inlet end bearing assembly (22) and the air outlet end bearing assembly (23), and the output of the oil distribution system is connected with the air inlet end bearing assembly (22) and the air outlet end bearing assembly (23).

7. Screw compressor according to claim 6, characterized in that The first gear cavity (24) is arranged in the main housing (3) and located at the side of the compression cavity (9) close to the air inlet end bearing assembly (22), the driving source (1) is arranged at the side of the main housing (3) close to the first gear cavity (24), the first gear cavity (24) is provided with the first gear assembly (25) connecting the main shaft (4) and the male rotor (5) or the female rotor (6), and the output of the oil distribution system also communicates with the first gear assembly (25).

8. Screw compressor according to claim 7, characterized in that The oil cavity (10) is arranged below the compression cavity (9), the bottom of the first gear cavity (24) communicates with the oil cavity (10), and the lubricating oil in the first gear cavity (24) is returned to the oil cavity (10).

9. A screw compressor according to claim 6, characterized in that: The second gear cavity (26) is arranged in the main housing (3) and located at the side of the compression cavity (9) close to the air outlet end bearing assembly (23), the second gear cavity (26) is provided with the second gear assembly (27) connecting the male rotor (5) and the female rotor (6) to make them rotate synchronously, and the output of the oil distribution system also communicates with the second gear assembly (27).

10. Screw compressor according to claim 9, characterized in that The oil cavity (10) is arranged below the compression cavity (9), the bottom of the second gear cavity (26) communicates with the oil cavity (10), and the lubricating oil in the second gear cavity (26) is returned to the oil cavity (10).

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