CN221003129U - Oil-free screw vacuum pump system - Google Patents

Abstract

The utility model provides an oilless screw vacuum pump system, including pump unit spare, cooling unit spare and air inlet unit spare, pump unit spare includes the host computer, the host computer includes the host computer casing, and set up a pair of screw rod rotor in the rotor inner chamber of host computer casing, cooling unit spare includes coolant tank, first delivery port and first water return mouth, the host computer casing is equipped with the cooling water intermediate layer, first water inlet and second delivery port, the host computer casing still is equipped with first air inlet and first gas outlet, coolant tank's first delivery port is linked together with host computer casing's first water inlet, host computer casing's second delivery port is linked together with coolant tank's first return water mouth, air inlet unit includes the intake pipe, the intake pipe is linked together with host computer casing's first air inlet, the one end and the first cooling inlet tube of host computer spray pipe are linked together, and the other end is linked together with the intake pipe. The oil-free screw vacuum pump system can improve the vacuum degree of the system without changing the structure of a host.

Description

Oil-free screw vacuum pump system

Technical Field

The utility model relates to the technical field of vacuum pumps, in particular to an oil-free screw vacuum pump system.

Background

Existing oil-free screw vacuum pump systems generally include a pump assembly, a gas filter assembly, an air intake assembly, a cooling assembly, and a muffler assembly. The pump assembly comprises a main machine and a motor, wherein the main machine comprises a main machine shell and a pair of screw rotors arranged in a rotor inner cavity of the main machine shell; the main engine is cooled by adopting a water cooling mode generally because the inner cavity of the rotor does not contain lubricating cooling oil, but the existing water cooling mode generally only cools the main engine shell, but cannot cool the screw rotor inside the main engine shell better, so that the temperature difference between the main engine shell and the screw rotor inside the main engine shell is larger. The temperature of the main machine shell is lower, the expansion of the materials is less, the temperature of the screw rotor is higher, the expansion of the materials is larger, the temperature of the main machine is also increased along with the increase of the vacuum degree, and when the expansion and the deformation of the materials are to a certain extent, the gap between the screw rotor and the main machine shell is reduced, so that the main machine is damaged due to the scratch between parts, the increase of the vacuum degree of the system is further limited, and the industries requiring complete vacuumizing or higher vacuum degree requirements cannot be met.

Aiming at the technical problems, the Chinese patent application with the application publication number of CN109458331A discloses an oilless screw vacuum pump system, the structure of which is shown in fig. 1-2, the oilless screw vacuum pump system comprises a main machine 1a and a motor 2a, the motor 2a is connected with the main machine 1a through a coupler 3a, the main machine 1a comprises a main machine shell and a pair of screw rotors 4a arranged in the inner cavities of the rotors of the main machine shell, the main machine shell is provided with a cooling water interlayer, a cooling water inlet 7a and a cooling water outlet 8a which are communicated with the cooling water interlayer are arranged on the main machine shell and used for cooling the main machine shell, a straight-shaft cooling water channel 5A is arranged in the center of a central shaft of the screw rotors 4a, and a helical tooth cooling water channel 6a is arranged in the center of a helical tooth of the screw rotors 4a and used for cooling the screw rotors 4 a. The oil-free screw vacuum pump system can not only cool the host shell, but also cool the screw rotor 4a, so that the host shell and the screw rotor 4a can be guaranteed to work at lower temperature, the cooling expansion conditions of the host shell and the screw rotor 4a are close, and therefore scraping can not occur, and the vacuum degree of the system is improved.

Although the existing oil-free screw vacuum pump system realizes double cooling of the main machine housing and the screw rotor 4a, the following technical problems still exist: the main machine structure needs to be changed, the cooling water channel is processed on the middle shaft and the spiral teeth of the screw rotor 4a, the design and processing difficulty is high, and the strength of the screw rotor 4a is reduced.

Disclosure of utility model

The utility model aims to solve the technical problems that: an oil-free screw vacuum pump system is provided, which can improve the vacuum degree of the system without changing the structure of a host.

The technical scheme of the utility model is as follows: the utility model provides an oilless screw vacuum pump system, includes pump unit spare, cooling unit spare and air inlet unit spare, the pump unit spare includes the host computer, the host computer includes the host computer casing and sets up a pair of screw rod rotor in the rotor inner chamber of host computer casing, the cooling unit spare includes coolant tank, and sets up first delivery port and first return port on coolant tank, the host computer casing is equipped with the cooling water intermediate layer and the first water inlet and the second delivery port that are linked together with the cooling water intermediate layer, the host computer casing still is equipped with first air inlet and the first gas outlet that are linked together with the rotor inner chamber, first delivery port of coolant tank is linked together with the first water inlet of host computer casing through first cooling inlet tube, the second delivery port of host computer casing is linked together with the first return port of coolant tank through first cooling return tube, the air inlet unit spare includes the intake pipe, the intake pipe is linked together with the first air inlet of host computer casing, the one end of host computer spray pipe is linked together with first cooling inlet tube, and the other end and intake pipe are linked together for to the atomized cooling water of intake pipe spraying.

The working principle of the oil-free screw vacuum pump system is as follows:

The cooling water output by the cooling water tank is divided into two paths through the first cooling water inlet pipe, one path of cooling water enters the cooling water interlayer of the main machine shell to cool the main machine shell, the other path of cooling water is atomized into water mist through the main machine spray pipe to enter the air inlet pipe, and the water mist enters the inner cavity of the rotor along with the air in the air inlet pipe to cool the screw rotor.

After the structure is adopted, the utility model has the following advantages:

The oil-free screw vacuum pump system still adopts a traditional cooling water interlayer cooling mode aiming at the cooling of a main machine shell, and a main machine spray pipe is additionally arranged between a first cooling water inlet pipe and an air inlet pipe aiming at the cooling of a screw rotor, and the cooling water is atomized into water mist and then is combined with air in the air inlet pipe to enter a rotor cavity, so that the screw rotor in the rotor cavity is cooled; the cooling of the main machine shell and the cooling of the screw rotor are not needed to change the main machine structure, so that the design and processing difficulty is reduced, and the strength of the screw rotor is not affected; therefore, the system realizes double cooling of the main machine shell and the screw rotor on the basis of not changing the main machine structure, so that the main machine shell and the screw rotor both work at lower temperature, the cooling expansion conditions of the main machine shell and the screw rotor are close, and therefore, scraping can not occur, and the vacuum degree of the system is improved.

Preferably, the air conditioner further comprises a silencing assembly, the silencing assembly comprises a first silencer and a gas-liquid separation device arranged in the first silencer, a second air inlet and a second air outlet are formed in the first silencer, the first air outlet of the main machine shell is communicated with the second air inlet of the first silencer, and the second air outlet of the first silencer is used for discharging dry gas separated by the gas-liquid separation device. The setting of the silencing component can reduce exhaust noise, and the setting of the gas-liquid separation device in the first silencer can reduce the water content of exhaust gas and enable the exhaust gas to be drier.

Preferably, the gas-liquid separation device comprises a front gas-liquid separation device and a rear gas-liquid separation device, an air channel which is communicated with a second air inlet and a second air outlet is arranged in the first silencer, the middle of the air channel is provided with the silencing device, the front gas-liquid separation device and the rear gas-liquid separation device are respectively arranged on the two sides of the air channel, the gas-liquid separation device further comprises a third water outlet and a fourth water outlet which are arranged on the first silencer, and a second water return port which is arranged on the cooling water tank, the third water outlet is communicated with the front gas-liquid separation device and is used for discharging cooling water separated by the front gas-liquid separation device, the fourth water outlet is communicated with the rear gas-liquid separation device and is used for discharging cooling water separated by the rear gas-liquid separation device, and the third water outlet and the fourth water outlet are connected and are communicated with the second water return port of the cooling water tank through a second cooling water return pipe. The two-stage gas-liquid separation device is arranged, so that liquid and gas can be better separated, the discharged gas is drier, and the loss of cooling water is smaller.

Preferably, the second air inlet is arranged at the top of the first silencer, the second air outlet is arranged at one side of the first silencer, the air channel comprises a vertical air channel communicated with the second air inlet and a horizontal air channel communicated between one side of the vertical air channel and the second air outlet, the front gas-liquid separation device is arranged in the vertical air channel, and the silencing device and the rear gas-liquid separation device are arranged in the horizontal air channel. The arrangement layout is reasonable and the structure is compact.

Preferably, the front gas-liquid separation device comprises a first coarse separation baffle, a second coarse separation baffle and a first wire mesh foam remover, the rear gas-liquid separation device comprises a second wire mesh foam remover, the first wire mesh foam remover and the second wire mesh foam remover are respectively arranged at the head end and the tail end of the horizontal air duct, and the first coarse separation baffle and the second coarse separation baffle are respectively enclosed at the upper side and the lower side of the first wire mesh foam remover and are used for performing coarse separation on gas entering the second air inlet and guiding the separated gas to enter the first wire mesh foam remover. This setting makes gas-liquid separation device simple structure, and separation effect is good.

Preferably, the air supply device further comprises an air supply pipe, a controller and a first temperature sensor, wherein one end of the air supply pipe is communicated with the atmosphere, the other end of the air supply pipe is communicated with the air inlet pipe, the air supply pipe is provided with an air supply valve, the first temperature sensor is arranged on a first air outlet of the host shell or a second air inlet of the first silencer, and the air supply valve and the first temperature sensor are electrically connected with the controller. The setting can be when host computer exhaust temperature rises along with the system vacuum gradually to surpass the setting value, automatic opening the air make-up valve, supplementary outside air reduces the system vacuum, and then reduces host computer temperature, reaches the purpose of protecting the host computer at last.

Preferably, the device further comprises a second silencer, and one end of the air supplementing pipe is communicated with the atmosphere through the second silencer. Because the vacuum degree in the system is lower, the noise of the gas entering is larger when the air compensating valve is opened, and the noise can be reduced by installing the second silencer.

Preferably, the air inlet pipe is further provided with a first one-way valve, and the first one-way valve is closer to the first air inlet of the main machine shell than the joint of the air supplementing pipe and the air inlet pipe. This arrangement can be used at system shut down without causing unstable sensor operation due to airflow backlash.

Preferably, the air conditioner further comprises a box frame and a gas filtering assembly, wherein the pump assembly, the cooling assembly, the air inlet assembly and the silencing assembly are all arranged in the box frame, and the gas filtering assembly is arranged outside the box frame and communicated with the air inlet assembly. The gas filtering component is arranged externally, and different gas filtering systems can be selected according to different working conditions, so that the whole system can be used for more working conditions.

Preferably, the water cooling device further comprises a water cooler, an overflow valve and a water filter which are sequentially communicated with the first cooling water inlet pipe along the water flow direction, a third water return port is further formed in the cooling water tank, the water inlet end of the water cooler is communicated with the first water outlet of the cooling water tank, the water outlet end of the water cooler is communicated with the water inlet end of the overflow valve, the first water outlet end of the overflow valve is communicated with the water inlet end of the water filter, the second water outlet end of the overflow valve is communicated with the third water return port of the cooling water tank through an overflow pipe, and the water outlet end of the water filter is respectively communicated with the host spray pipe and the first water inlet of the host shell. This setting can utilize the water cooler to cool off the cooling water, utilizes the water filter to filter the cooling water, and when the water filter blocks up, can utilize the overflow valve directly to draw back the cooling water in the cooling water tank moreover, avoids pipeline leakage scheduling problem.

Description of the drawings:

FIG. 1 is a schematic diagram of a prior oil-free screw vacuum pump system;

FIG. 2 is a schematic view of the structure of a screw rotor of a conventional oil-free screw vacuum pump system;

FIG. 3 is a functional schematic of an oil-free screw vacuum pump system of the present utility model;

FIG. 4 is a schematic cut-away view of a first muffler of the oil-free screw vacuum pump system of the present utility model;

FIG. 5 is a schematic cross-sectional view of a first and second roughing baffle of an oil-free screw vacuum pump system of the present utility model;

In the prior art diagram: 1 a-main machine, 2 a-motor, 3 a-coupling, 4 a-screw rotor, 5 a-straight shaft cooling water channel and 6 a-helical tooth cooling water channel;

In the drawings of the utility model: 1-pump assembly, 2-air inlet assembly, 3-host, 4-host shell, 5-cooling water tank, 6-first water outlet, 7-first water return, 8-first water inlet, 9-second water outlet, 10-first air inlet, 11-first air outlet, 12-first cooling water inlet pipe, 13-first cooling water return pipe, 14-air inlet pipe, 15-host spray pipe, 16-air supplementing pipe, 17-first temperature sensor, 18-air supplementing valve, 19-second silencer, 20-first check valve, 21-first silencer, 22-second air inlet, 23-second air outlet, 24-front gas-liquid separation device, 25-rear gas-liquid separation device, 26-silencer, 27-third water outlet, 28-fourth water outlet, 29-second water return, 30-second cooling return pipe, 31-vertical air duct, 32-horizontal air duct, 33-first coarse separation baffle, 34-second coarse separation baffle, 35-first wire-mesh demister, 36-second wire-mesh demister, 37-gas filtering component, 38-water cooler, 39-overflow valve, 40-water filter, 41-third water return, 42-motor, 43-center bracket, 44-coupling, 45-pressure sensor, 46-water pump, 47-fifth water outlet, 48-ball valve, 49-condenser, 50-fan, 51-second temperature sensor, 52-silencing component, 53-overflow pipe, 54-second one-way valve.

Detailed Description

The utility model will be further described with reference to the accompanying drawings, in conjunction with examples.

Examples:

As shown in fig. 3-5, an oil-free screw vacuum pump system comprises a pump assembly 1, a cooling assembly and an air inlet assembly 2, wherein the pump assembly 1 comprises a host 3, the host 3 comprises a host shell 4 and a pair of screw rotors arranged in a rotor inner cavity of the host shell 4, the cooling assembly comprises a cooling water tank 5, a first water outlet 6 and a first water return port 7 which are arranged on the cooling water tank 5, the host shell 4 is provided with a cooling water interlayer, a first water inlet 8 and a second water outlet 9 which are communicated with the cooling water interlayer, the host shell 4 is further provided with a first air inlet 10 and a first air outlet 11 which are communicated with the rotor inner cavity, the first water outlet 6 of the cooling water tank 5 is communicated with the first water inlet 8 of the host shell 4 through a first cooling water inlet pipe 12, the second water outlet 9 of the host shell 4 is communicated with the first water return port 7 of the cooling water tank 5 through a first cooling water return pipe 13, the air inlet assembly 2 comprises an air inlet pipe 14, the air inlet pipe 14 is communicated with the first air inlet 10 of the host shell 4, the air inlet pipe 15 is further comprises a first air inlet pipe 15 communicated with the first air inlet pipe 14 and the air inlet pipe 14 is communicated with one end of an atomizing pipe 14, which is communicated with the first air inlet pipe 14 and is used for spraying water.

Still include the amortization subassembly 52, amortization subassembly 52 includes first muffler 21 and sets up the gas-liquid separation device in first muffler 21, be equipped with second air inlet 22 and second gas outlet 23 on the first muffler 21, the first gas outlet 11 of host computer casing 4 is linked together with the second air inlet 22 of first muffler 21, the second gas outlet 23 of first muffler 21 is used for discharging the dry gas of gas-liquid separation device separation.

The gas-liquid separation device comprises a front gas-liquid separation device 24 and a rear gas-liquid separation device 25, an air flue which is communicated with a second air inlet 22 and a second air outlet 23 is arranged in the first silencer 21, a silencing device 26 is arranged in the middle of the air flue, the front gas-liquid separation device 24 and the rear gas-liquid separation device 25 are respectively arranged at two sides of the air flue, the gas-liquid separation device further comprises a third water outlet 27 and a fourth water outlet 28 which are arranged on the first silencer 21, and a second water return port 29 which is arranged on the cooling water tank 5, the third water outlet 27 is communicated with the front gas-liquid separation device 24 and is used for discharging cooling water separated by the front gas-liquid separation device 24, the fourth water outlet 28 is communicated with the rear gas-liquid separation device 25 and is used for discharging cooling water separated by the rear gas-liquid separation device 25, and the third water outlet 27 and the fourth water outlet 28 are connected and are communicated with the second water return port 29 of the cooling water tank 5 through a second cooling water return pipe 30; the second cooling return pipe 30 is provided with a second check valve 54.

The second air inlet 22 is arranged at the top of the first silencer 21, the second air outlet 23 is arranged at one side of the first silencer 21, the air duct comprises a vertical air duct 31 communicated with the second air inlet 22 and a horizontal air duct 32 communicated between one side of the vertical air duct 31 and the second air outlet 23, the front gas-liquid separation device 24 is arranged in the vertical air duct 31, and the silencing device 26 and the rear gas-liquid separation device 25 are arranged in the horizontal air duct 32.

The front gas-liquid separation device 24 comprises a first coarse separation baffle 33, a second coarse separation baffle 34 and a first wire mesh foam remover 35, the rear gas-liquid separation device 25 comprises a second wire mesh foam remover 36, the first wire mesh foam remover 35 and the second wire mesh foam remover 36 are respectively arranged at the head end and the tail end of the horizontal air duct 32, and the first coarse separation baffle 33 and the second coarse separation baffle 34 are respectively enclosed at the upper side and the lower side of the first wire mesh foam remover 35 and are used for performing coarse separation on gas entering the second air inlet 22 and guiding the separated gas to enter the first wire mesh foam remover 35.

The intelligent air supply system comprises a main body shell 4, and is characterized by further comprising an air supply pipe 16, a controller and a first temperature sensor 17, wherein one end of the air supply pipe 16 is communicated with the atmosphere, the other end of the air supply pipe is communicated with an air inlet pipe 14, an air supply valve 18 is arranged on the air supply pipe 16, the first temperature sensor 17 is arranged on a first air outlet 11 of the main body shell 4 or a second air inlet 22 of a first silencer 21, the air supply valve 18 and the first temperature sensor 17 are electrically connected with the controller, a core element of the controller is a single chip microcomputer or a Digital Signal Processor (DSP) and is used for controlling the operation of a valve, a fan, a motor and the like according to state information detected by related sensors, and a hardware circuit and software design of the controller adopt the prior art, so that no schematic illustration is given in the figure; also comprises a second muffler 19, and one end of the air supplementing pipe 16 is communicated with the atmosphere through the second muffler 19.

The air inlet pipe 14 is also provided with a first one-way valve 20, and the first one-way valve 20 is closer to the first air inlet 10 of the main machine shell 4 than the joint of the air supplementing pipe 16 and the air inlet pipe 14; the pump assembly 1 further comprises a motor 42 for driving the host 3, the motor 42 is connected with the host 3 through a center bracket 43 and a coupler 44, the air inlet pipe 14 is further provided with a pressure sensor 45, the pressure sensor 45 is closer to the first air inlet 10 of the host shell 4 than the joint of the air supplementing pipe 16 and the air inlet pipe 14, and the pressure sensor 45 and the motor 42 are electrically connected with a controller and are used for controlling the operation of the motor 42 according to the system vacuum degree detected by the pressure sensor 45.

Still include box frame and gas filtration subassembly 37, pump assembly 1, cooling module, subassembly 2 and the amortization subassembly 52 of admitting air all set up in the box frame, gas filtration subassembly 37 sets up outside the box frame and is linked together with subassembly 2 that admits air, and the box frame adopts prior art can, no longer gives the illustration in the figure.

The water cooling device further comprises a water cooler 38, an overflow valve 39 and a water filter 40 which are sequentially communicated with the first cooling water inlet pipe 12 along the water flow direction, wherein the cooling water tank 5 is further provided with a third water return port 41, the water inlet end of the water cooler 38 is communicated with the first water outlet 6 of the cooling water tank 5, the water outlet end of the water cooler 38 is communicated with the water inlet end of the overflow valve 39, the first water outlet end of the overflow valve 39 is communicated with the water inlet end of the water filter 40, the second water outlet end of the overflow valve 39 is communicated with the third water return port 41 of the cooling water tank 5 through an overflow pipe 53, and the water outlet end of the water filter 40 is respectively communicated with the main machine spray pipe 15 and the first water inlet 8 of the main machine shell 4; a water pump 46 is further arranged between the first water outlet 6 of the cooling water tank 5 and the water cooler 38, the water pump 46 is electrically connected with the controller, and the water pump 46 continuously operates to enable the inside of the cooling water tank 5 to be negative pressure, so that the cooling water in the cooling water interlayer and the first silencer 21 can be recycled into the cooling water tank 5 through the negative pressure; a fifth water outlet 47 is further arranged on the cooling water tank 5, and a ball valve 48 is arranged at the fifth water outlet 47 and used for opening the ball valve 48 when cooling water needs to be replaced; the water cooler 38 comprises a condenser 49 and a fan 50, a wind port of the fan 50 is opposite to a radiating surface of the condenser 49, a second temperature sensor 51 is further arranged on the cooling water tank 5, and the second temperature sensor 51 and the fan 50 are electrically connected with the controller and are used for starting the fan 50 when the second temperature sensor 51 detects that the temperature of cooling water is higher than a set value.

The working principle of the oil-free screw vacuum pump system is as follows:

Cooling water flow path: the water in the cooling water tank 5 is conveyed to the water cooler 38 through the first water outlet 6, and the water cooler 38 controls the operation of the fan 50 according to the temperature of the cooling water detected by the second temperature sensor 51; the cooling water cooled by the water cooler 38 is delivered to the overflow valve 39, normally through the first water outlet end of the overflow valve 39 to the water filter 40, and abnormally through the second water outlet end of the overflow valve 39 to the third water return port 41 of the cooling water tank 5; the cooling water filtered by the water filter 40 is divided into two paths, one path enters a cooling water interlayer through the first water inlet 8 of the main machine shell 4 to cool the main machine shell 4, the other path enters the air inlet pipe 14 after being atomized into water mist through the main machine spray pipe 15, and enters the inner cavity of the rotor along with the air in the air inlet pipe 14 to cool the screw rotor in the inner cavity of the rotor, so that double cooling of the main machine shell 4 and the screw rotor is realized; the cooling water passing through the cooling water interlayer is communicated with the first water return port 7 of the cooling water tank 5 through the second water outlet 9 and the first cooling water return pipe 13, so that the cooling water is recovered into the cooling water tank 5 again to form a cooling water circulation; the cooling water atomized into water mist by the main machine spray pipe 15 is discharged into the first muffler 21 through the first air outlet 11 after passing through the main machine 3, and the gas and the liquid are separated by the gas-liquid separation device in the first muffler 21.

Main gas flow path: the gas is filtered by an external gas filtering component 37; the filtered clean gas enters an air inlet pipe 14 of the air inlet assembly 2; the gas in the gas inlet pipe 14 enters the rotor cavity of the host machine 3 through the first gas inlet 10 on the host machine shell 4, is compressed by the screw rotor and is discharged from the first gas outlet 11 of the host machine shell 4; compressed gas discharged from the main unit 3 enters the first muffler 21 through the second inlet 22 on the first muffler 21; when the gas entering the first silencer 21 sequentially passes through the front gas-liquid separation device 24, the silencing device 26 and the rear gas-liquid separation device 25 of the air duct, and passes through the front gas-liquid separation device 24 in the vertical air duct 31, the gas is firstly subjected to coarse separation through the first coarse separation baffle 33 and the second coarse separation baffle 34, and enters the first wire mesh foam remover 35 for primary fine separation under the guidance of the first coarse separation baffle 33 and the second coarse separation baffle 34, and the cooling water separated by the front gas-liquid separation device 24 is discharged through the third water outlet 27; the gas separated by the first wire mesh demister 35 is subjected to noise reduction treatment by the silencer 26 in the horizontal air duct 32; the gas after noise reduction treatment is subjected to secondary fine separation by a second wire mesh demister 36 of the rear gas-liquid separation device 25, cooling water separated by the rear gas-liquid separation device 25 is discharged through a fourth water outlet 28, and dry gas is discharged through a second air outlet 23; the cooling water discharged from the third water outlet 27 and the fourth water outlet 28 is finally recovered into the cooling water tank 5 through the second cooling return pipe 30.

Gas-assisted flow path: when the first temperature sensor 17 on the first silencer 21 detects that the exhaust temperature exceeds a set value, the air compensating valve 18 is controlled to be opened, external air enters the air inlet pipe 14 through the air compensating valve 18 after being reduced in noise by the second silencer 19, the external air is supplemented to reduce the vacuum degree of the system, the exhaust temperature is reduced along with the reduction, and the effect of protecting the host computer 3 is finally achieved.

Claims (10)

1. An oil-free screw vacuum pump system comprises a pump assembly (1), a cooling assembly and an air inlet assembly (2), the pump assembly (1) comprises a main machine (3), the main machine (3) comprises a main machine shell (4) and a pair of screw rotors arranged in a rotor inner cavity of the main machine shell (4), the cooling component comprises a cooling water tank (5), a first water outlet (6) and a first water return port (7) which are arranged on the cooling water tank (5), the main machine shell (4) is provided with a cooling water interlayer, a first water inlet (8) and a second water outlet (9) which are communicated with the cooling water interlayer, the main machine shell (4) is also provided with a first air inlet (10) and a first air outlet (11) which are communicated with the inner cavity of the rotor, the first water outlet (6) of the cooling water tank (5) is communicated with the first water inlet (8) of the main machine shell (4) through a first cooling water inlet pipe (12), the second water outlet (9) of the main machine shell (4) is communicated with the first water return opening (7) of the cooling water tank (5) through a first cooling water return pipe (13), the air inlet assembly (2) comprises an air inlet pipe (14), and the air inlet pipe (14) is communicated with a first air inlet (10) of the main machine shell (4), and is characterized in that: the cooling system further comprises a main machine spray pipe (15), wherein one end of the main machine spray pipe (15) is communicated with the first cooling water inlet pipe (12), and the other end of the main machine spray pipe is communicated with the air inlet pipe (14) and is used for spraying atomized cooling water to the air inlet pipe (14).

2. An oil-free screw vacuum pump system as claimed in claim 1, wherein: still include noise abatement assembly (52), noise abatement assembly (52) include first muffler (21) and set up the gas-liquid separation device in first muffler (21), be equipped with second air inlet (22) and second gas outlet (23) on first muffler (21), first gas outlet (11) of host computer casing (4) are linked together with second air inlet (22) of first muffler (21), second gas outlet (23) of first muffler (21) are used for discharging the dry gas of gas-liquid separation device separation.

3. An oil-free screw vacuum pump system as claimed in claim 2, wherein: the gas-liquid separation device comprises a front gas-liquid separation device (24) and a rear gas-liquid separation device (25), an air channel which is communicated with a second air inlet (22) and a second air outlet (23) is arranged in the first silencer (21), a silencing device (26) is arranged in the middle of the air channel, the front gas-liquid separation device (24) and the rear gas-liquid separation device (25) are respectively arranged on two sides of the air channel, the gas-liquid separation device further comprises a third water outlet (27) and a fourth water outlet (28) which are arranged on the first silencer (21) and a second water return port (29) which is arranged on the cooling water tank (5), the third water outlet (27) is communicated with the front gas-liquid separation device (24) and is used for discharging cooling water separated by the front gas-liquid separation device (24), the fourth water outlet (28) is communicated with the rear gas-liquid separation device (25) and is used for discharging cooling water separated by the rear gas-liquid separation device (25), and the third water outlet (27) and the fourth water outlet (28) are connected with the second water return port (29) and are communicated with the second water return port (29) through the second cooling water return pipe (30).

4. An oil-free screw vacuum pump system according to claim 3, wherein: the second air inlet (22) is arranged at the top of the first silencer (21), the second air outlet (23) is arranged on one side of the first silencer (21), the air channel comprises a vertical air channel (31) communicated with the second air inlet (22) and a horizontal air channel (32) communicated between one side of the vertical air channel (31) and the second air outlet (23), the front gas-liquid separation device (24) is arranged in the vertical air channel (31), and the silencing device (26) and the rear gas-liquid separation device (25) are arranged in the horizontal air channel (32).

5. An oil-free screw vacuum pump system as set forth in claim 4 wherein: the front-mounted gas-liquid separation device (24) comprises a first coarse separation baffle (33), a second coarse separation baffle (34) and a first wire mesh foam remover (35), the rear-mounted gas-liquid separation device (25) comprises a second wire mesh foam remover (36), the first wire mesh foam remover (35) and the second wire mesh foam remover (36) are respectively arranged at the head end and the tail end of the horizontal air duct (32), and the first coarse separation baffle (33) and the second coarse separation baffle (34) are respectively arranged on the upper side and the lower side of the first wire mesh foam remover (35) in a surrounding mode and are used for coarse separation of gas entering the second air inlet (22) and guiding the separated gas to enter the first wire mesh foam remover (35).

6. An oil-free screw vacuum pump system according to claim 1 or 2, characterized in that: still include air supplementing pipe (16), controller and first temperature sensor (17), the one end and the atmosphere of air supplementing pipe (16) are linked together, and the other end is linked together with intake pipe (14), be equipped with air supplementing valve (18) on air supplementing pipe (16), first temperature sensor (17) set up on first gas outlet (11) of host computer casing (4) or second air inlet (22) of first muffler (21), air supplementing valve (18) and first temperature sensor (17) are all connected with the controller electricity.

7. An oil-free screw vacuum pump system as set forth in claim 6 wherein: the device also comprises a second silencer (19), and one end of the air supplementing pipe (16) is communicated with the atmosphere through the second silencer (19).

8. An oil-free screw vacuum pump system as set forth in claim 6 wherein: the air inlet pipe (14) is further provided with a first one-way valve (20), and the joint of the air supplementing pipe (16) and the air inlet pipe (14) is closer to the first air inlet (10) of the host shell (4) than the joint of the first one-way valve (20).

9. An oil-free screw vacuum pump system as claimed in claim 2, wherein: still include box frame and gas filtration subassembly (37), pump unit spare (1), cooling module, air inlet module (2) and amortization subassembly (52) all set up in the box frame, gas filtration subassembly (37) set up outside the box frame and are linked together with air inlet module (2).

10. An oil-free screw vacuum pump system as claimed in claim 1, wherein: still including water cooler (38), overflow valve (39) and water filter (40) on first cooling inlet tube (12) of water flow direction intercommunication in proper order, still be equipped with third return mouth (41) on coolant tank (5), the water inlet of water cooler (38) is linked together with first delivery port (6) of coolant tank (5), the water outlet of water cooler (38) is linked together with the water inlet of overflow valve (39), the first water outlet of overflow valve (39) is linked together with the water inlet of water filter (40), the second water outlet of overflow valve (39) is linked together with third return mouth (41) of coolant tank (5) through overflow pipe (53), the water outlet of water filter (40) is linked together with first water inlet (8) of host computer spray pipe (15) and host computer casing (4) respectively.