CN213360422U

CN213360422U - High-efficiency energy-saving type two-stage screw air compressor system

Info

Publication number: CN213360422U
Application number: CN202021949065.8U
Authority: CN
Inventors: 林海杰; 罗迪; 徐培钰; 吴敏涛
Original assignee: Ellide Guangdong Intelligent Technology Co ltd
Current assignee: Ellide Guangdong Intelligent Technology Co ltd
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2021-06-04
Anticipated expiration: 2030-09-08

Abstract

The utility model discloses a high-efficiency energy-saving two-stage screw air compressor system, which comprises a two-stage screw air compressor, a gas-liquid separation device, a cooler, a temperature control valve and an air filter; an air filter is arranged at an air inlet on the two-stage screw air compressor, an oil-gas outlet is connected with an oil-gas inlet on the gas-liquid separation device, a lubricating oil outlet on the gas-liquid separation device is connected with a hot oil inlet on the temperature control valve, a compressed air outlet is connected with an air inlet on the cooler, a hot oil outlet on the temperature control valve is connected with an oil inlet on the cooler, an oil outlet on the cooler is connected with a cold oil inlet on the temperature control valve, and a cold oil outlet on the temperature control valve is connected with a lubricating oil inlet on the two-stage screw. The utility model discloses system structure is compact, and area is little, can form the integral structure and popularize and apply in present mill, and the environmental protection and energy saving effect of this system is better, and equipment cost is lower, has good market prospect.

Description

High-efficiency energy-saving type two-stage screw air compressor system

Technical Field

The utility model relates to an air compressor technical field, in particular to energy-efficient formula doublestage screw compressor machine system.

Background

Screw air compressor systems have become increasingly popular for use as one of the power gas supply devices in modern factories. At present, screw air compressors generally adopted in the industry mainly comprise a single-stage double-screw air compressor, a double-stage double-screw air compressor and the like, wherein the double-stage double-screw air compressor is greatly improved in an energy-saving effect in an industrial application process compared with the single-stage double-screw air compressor, but the following phenomena still exist:

(1) the screw and the driving motor are connected by adopting parts such as gears, couplings and the like, the power transmission efficiency is low, and simultaneously, as the gears are meshed, lubricating oil can enter the gear assembly, the phenomena of pitting corrosion and even tooth breakage are easily generated on the gears, and the integral service life and the normal operation of the equipment are influenced; in addition, due to the fact that the number of connecting parts is large, the air compressor is prone to blocking, oil leakage or gas leakage and the like, and the operation effect of the air compressor system is affected; meanwhile, the gear ratio is fixed, so that the point efficiency is emphasized, namely the specific power is optimal only under the fixed rotating speed and rated pressure, and when the variable-frequency variable-speed operation is required, the energy consumption of the air compressor cannot be synchronously reduced even if the rotating speed is reduced due to the fixed gear ratio, so that the energy consumption of the air compressor is very high. (2) The air inlet of air compressor machine generally sets up in the screw rod side, and the air inlet diameter is far less than screw rod length, therefore gaseous follow air inlet department get into the compressor after, unable fast dispersion in the screw rod periphery, also can cause certain influence to the compression efficiency of compressor and compressed gas's flow degree of consistency. (3) In the operation process of the air compressor, lubricating oil is easy to leak from the joints at the two ends of the screw rod, and the leaked lubricating oil easily affects other parts (such as gears, bearings and the like) in the air compressor, so that the air compressor is easy to break down. (4) In the operation process of the air compressor, the driving motor needs to be cooled in time so as to avoid shutdown or other influences caused by overheating, but the driving motor is cooled in real time mainly by the cooling system of the air compressor at present, the cooling effect is not ideal, the operation stability of the air compressor is easily influenced, and meanwhile, the energy consumption required by the cooling system is also large.

In addition, in the screw air compressor system commonly used at present, the gas-liquid separation device and the filter element are separated from each other to form two mutually independent separation spaces, so that the structure is huge, the installation is complex, and the use cost of the equipment is higher.

The lubricating oil used by the screw air compressor is generally recycled, and at present, two main modes are available: the first mode is to directly send back lubricating oil to doublestage screw air compressor service function, and under this condition, because the lubricating oil after retrieving still has higher temperature generally, if doublestage screw air compressor uses under this high temperature for a long time, not only causes equipment trouble (such as phenomenon such as sealing member ageing, lubricating oil gelation) itself easily, and the operating efficiency is low, threatens whole air compression system's safe and stable operation moreover easily. The second mode is that the lubricating oil obtained by separation is firstly and completely sent into a cooler to be cooled and then sent back to the double-stage screw air compressor to be used, although the temperature of the lubricating oil can be effectively reduced, the phenomenon of equipment failure caused by overhigh temperature is avoided, the cooling capacity of the lubricating oil is very large, a high-power cooler needs to be equipped, the energy consumption required by cooling is large, the purposes of environmental protection and energy conservation cannot be achieved, meanwhile, the equipment cost is also high, and the control of the production cost is not facilitated.

Based on the problems, the existing two-stage screw air compressor system needs to be further improved to adapt to the modern production requirements, and the purposes of environmental protection and energy saving are further achieved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the not enough of prior art, provide a simple, the better energy-efficient formula doublestage screw compressor machine system of energy-conserving effect of principle.

The technical scheme of the utility model is that: a high-efficiency energy-saving two-stage screw air compressor system comprises a two-stage screw air compressor, a gas-liquid separation device, a cooler, a temperature control valve and an air filter; the two-stage screw compressor is provided with an air inlet, a lubricating oil inlet and an oil-gas outlet, the gas-liquid separation device is provided with an oil-gas inlet, a lubricating oil outlet and a compressed air outlet, the temperature control valve is provided with a hot oil inlet and a hot oil outlet, the cooling oil inlet and the cooling oil outlet are arranged on the cooler, an oil inlet, an oil outlet, an air inlet end and an air outlet end are arranged on the cooler, an air filter is arranged at the air inlet on the double-stage screw air compressor, the oil-gas outlet is connected with the oil-gas inlet on the gas-liquid separation device, the lubricating oil outlet on the gas-liquid separation device is connected with the hot oil inlet on the temperature control valve, the compressed air outlet is connected with the air inlet end on the cooler, the hot oil outlet on the temperature control valve is connected with the oil inlet on the cooler, the oil outlet on the cooler is connected with the cooling oil inlet on the temperature control valve, and the cooling oil outlet on. The air filter filters outside air entering the two-stage screw air compressor, compressed air with lubricating oil is formed after the two-stage screw air compressor performs air compression, the compressed air is separated by the gas-liquid separation device, the compressed air obtained after separation is directly cooled by the cooler and sent out, the lubricating oil obtained after separation is the lubricating oil, the temperature of the lubricating oil is firstly detected by the temperature control valve, and then whether the lubricating oil needs to be cooled by the cooler and then recycled is determined, so that the cooling capacity of the lubricating oil is accurately controlled, meanwhile, the temperature of the recycled lubricating oil is appropriate, and the normal operation of the two-stage screw air compressor is ensured.

The temperature control valve is a four-way valve with an oil filter inside, and a temperature control element for detecting the oil temperature at the hot oil inlet in real time is arranged in the temperature control valve. The temperature control element is used for detecting the oil temperature at the hot oil inlet in real time, when the oil temperature does not exceed a set value, the lubricating oil does not need to be cooled, the hot oil outlet is closed, and the lubricating oil is directly conveyed to the two-stage screw air compressor from the cold oil outlet; and when the oil temperature reaches or exceeds a set value, a hot oil outlet is opened, and the lubricating oil is conveyed to a cooler from the hot oil outlet for cooling. Lubricating oil is filtered through the oil filter before being output from the cold oil outlet, so that impurities can be effectively prevented from entering the two-stage screw air compressor to influence the normal operation of the equipment.

The two-stage screw air compressor is a direct-connected air compressor without gear transmission loss and comprises a first driving motor, a second driving motor, a first double-screw component, a second double-screw component and a casing, wherein a first-stage cavity and a second-stage cavity are formed inside the casing, the first-stage cavity and the second-stage cavity are communicated through air pipes, the first double-screw component is arranged in the first-stage cavity, the second double-screw component is arranged in the second-stage cavity, a motor shaft of the first driving motor and a screw shaft in the first double-screw component are the same rotating shaft, and a motor shaft of the second driving motor and a screw shaft in the second double-screw component are the same rotating shaft. In the structure, under the power action of a first driving motor, a first double-screw assembly performs primary compression on air in a primary cavity, and under the power action of a second driving motor, a second double-screw assembly performs secondary compression on the air which has undergone the primary compression in a secondary cavity; the drive motor and the screw rod which are positioned at the same level are directly connected by adopting an embedded integral shaft, namely, the rotating shaft is used as a motor shaft of the drive motor and also used as a drive screw shaft of the double-screw assembly, power transmission assemblies such as gears, couplers and the like in the traditional double-screw compressor are eliminated, the adverse effects caused by the phenomena of pitting corrosion or tooth breakage of the gears, coupler faults and the like can be effectively avoided, and the power transmission efficiency can be effectively improved. The air pipe between the first-stage cavity and the second-stage cavity can be a connecting channel integrally formed by the casing, and a connecting pipeline externally arranged on the casing can also be adopted.

Still be equipped with the flow distribution plate in the doublestage screw rod air compressor, one side of one-level die cavity sets up air intlet, one side of second grade die cavity sets up the oil gas export, and the flow distribution plate is located the one-level die cavity between air intlet and the first pair screw rod subassembly, and the length of flow distribution plate is greater than the diameter of air intlet and is less than the length of first pair screw rod subassembly. The setting of air intlet department flow distribution plate can get up the water conservancy diversion effect after the air admission air intlet, disperses the air to the twin-screw subassembly periphery fast, can effectively improve gas compression's homogeneity, improves compression efficiency simultaneously, also avoids the air current to get into the first twin-screw subassembly of direct impact behind the one-level die cavity.

The first driving motor and the second driving motor are both permanent magnet motors; the permanent magnets are arranged in the motor rotors of the first driving motor and the second driving motor, the high-performance Ru-Fe-B permanent magnets existing in the market can be adopted, and the permanent magnets are guaranteed not to lose magnetism in the life cycle of the air compressor.

The first double-screw assembly and the second double-screw assembly are arranged up and down and are meshed with each other; the first double-screw assembly and the second double-screw assembly respectively comprise two screws, and the screws arranged above the first double-screw assembly and the second double-screw assembly are male screws; the screw shaft of the male screw in the first double-screw assembly extends to form an integral structure with the motor shaft of the first driving motor, and the screw shaft of the male screw in the second double-screw assembly extends to form an integral structure with the motor shaft of the second driving motor.

In the first double-screw assembly and the second double-screw assembly, the end part periphery of each screw is connected with the shell through a bearing assembly at one end opposite to the first driving motor and the second driving motor; the bearing assembly comprises an adjusting gasket, a first bearing, a middle gasket, a second bearing and a locking nut which are coaxially arranged in sequence. The bearing assembly is a sealing assembly of the double-screw assembly, so that the leakage of lubricating oil can be effectively prevented, and the fault of the air compressor caused by the leakage of the lubricating oil is avoided; meanwhile, the bearings of different types are matched, and the gaskets are arranged between the bearings, so that the impact resistance of the double-screw assembly and the bearing assembly can be effectively improved, and the service life of the air compressor is prolonged.

The first driving motor and the second driving motor have the same structure, and the peripheries of the motor stators of the first driving motor and the second driving motor are respectively provided with a heat dissipation shell; the heat dissipation shell is of an integrated structure and comprises a shell body and heat dissipation fins which are connected, and the heat dissipation fins are uniformly distributed on the periphery of the shell body. Under the action of a fan at the rear end of the driving motor, the heat dissipation shell can well dissipate heat of a stator and a rotor of the driving motor, and hot air generated after cooling is discharged from a through hole formed in the motor shell. The setting of this heat dissipation shell can carry out independent air-cooled cooling to driving motor, makes driving motor's cooling need not to rely on the cooling system of air compressor machine, can effectively improve the stability of air compressor machine operation, also reduces the energy consumption of air compressor machine simultaneously. In practical application, the cooling device can be used by combining with a cooling system of an air compressor, and a very good cooling effect can be achieved.

The cooler is an air-cooled cooler with double cooling channels, a lubricating oil cooling channel and a compressed air cooling channel which are mutually independent are arranged in the cooler, the two ends of the lubricating oil cooling channel are respectively provided with an oil inlet and an oil outlet, and the two ends of the compressed air cooling channel are respectively provided with an air inlet end and an air outlet end;

the lubricating oil cooling channel and the compressed air cooling channel are arranged in parallel, a fan assembly is arranged on the outer side of the lubricating oil cooling channel and/or the outer side of the compressed air cooling channel, and the air outlet direction of the fan assembly is perpendicular to the flowing direction of lubricating oil and compressed air.

Utilize the cooler of above-mentioned structure, can cool off lubricating oil and compressed air respectively simultaneously, its cooling efficiency is high, simultaneously, carries out lubricating oil and compressed air's cooling in same cooler, and reducible cooler's use simplifies whole air compression system's equipment structure, avoids a large amount of pipe usages and occupies a large amount of installation area, makes whole air compression system's structure compacter.

The gas-liquid separation device is a separation device with a built-in filter element and comprises an outer cylinder body, an inner cylinder, a filter element, an upper cover and a mounting and fixing ring, wherein the inner cylinder is arranged inside the outer cylinder body, the filter element is arranged in the inner cylinder, the upper end of the outer cylinder body and the upper end of the inner cylinder are respectively and fixedly connected with the bottom surface of the mounting and fixing ring, the top surface of the mounting and fixing ring is provided with an inwards-concave annular surface, the upper end of the filter element is provided with an installation part extending towards the periphery, the installation part is embedded on the annular surface, and the upper cover is; the lateral wall of outer barrel is equipped with oil gas import and lubricating oil export, and the upper cover is equipped with the compressed air export. Wherein, form the separation structure of first order between outer barrel and the inner tube, form the separation structure of second level between filter core and the inner tube, the lubricating oil that obtains after the separation subsides in the bottom of outer barrel, then stretch out and send out to the temperature-sensing valve by the pipeline of lubricating oil outlet to outer barrel bottom, and the compressed air that obtains after the separation is sent out to the cooler from the compressed air exit on the upper cover. The mounting fixing ring is mainly used for fixedly mounting the outer barrel and the inner barrel, and simultaneously provides a stable mounting platform for the filter element, so that the stability of the structure of the gas-liquid separation device is ensured.

The side wall of the inner cylinder is inclined. The inner cylinder is integrally in a micro-horn shape arranged from top to bottom, the inclined side wall of the inner cylinder has a good flow guiding effect on oil gas entering the gas-liquid separation device, and lubricating oil contained in the oil gas gradually flows along the side wall and then descends to the bottom of the outer cylinder body after attaching to the side wall of the inner cylinder.

In addition, the filter element can adopt an integrated structure, and the mounting part is a circular ring which is formed by directly extending the upper end of the filter element to the periphery; also can adopt split type structure, the filter core main part is cylindric structure, and the upper end of filter core main part is equipped with the hoop, and the hoop upper end extends to the periphery and forms the installation department, and the filter core passes through the hoop and presss from both sides tight fixed mounting.

The two-stage screw air compressor system also comprises an installation part, and the two-stage screw air compressor, the gas-liquid separation device, the cooler, the temperature control valve and the air filter are all arranged in the installation part and form a circulation loop;

the installation part can adopt a rack type structure or a chassis type structure, mainly plays a supporting role, and encapsulates the two-stage screw air compressor system to form an integral structure.

When the high-efficiency energy-saving type two-stage screw air compressor system is used, the principle is as follows: the external air is filtered by an air filter, enters a two-stage screw air compressor through an air inlet, is compressed by a first-stage cavity and a second-stage cavity in the two-stage screw air compressor in sequence, the compressed air with lubricating oil is sent out from an oil-gas outlet and enters a gas-liquid separation device through the oil-gas inlet for separation, the compressed air obtained after separation is sent out from the compressed air outlet, enters a cooler through an air inlet end of the cooler for cooling and is sent out to an external gas-using device after cooling, the lubricating oil obtained after separation firstly passes through a temperature control valve, the temperature control valve detects the oil temperature in real time, when the oil temperature does not exceed a set value, the lubricating oil does not need to be cooled, the hot oil outlet is closed at the moment, the lubricating oil is filtered by an oil filter in the temperature control valve and then is directly sent out from a cold oil outlet and, when the oil temperature reaches or exceeds a set value, the hot oil outlet is opened at the moment, the lubricating oil is conveyed to the cooler from the hot oil outlet for cooling, the cooled lubricating oil enters the temperature control valve from the cold oil inlet, is filtered by the oil filter in the temperature control valve and then is conveyed to the two-stage screw air compressor from the cold oil outlet, so that the lubricating oil is recycled, and a stable high-efficiency energy-saving two-stage screw air compressor system is formed.

Compared with the prior art, the utility model, following beneficial effect has:

this energy-efficient formula doublestage screw compressor machine system improves on traditional air compression system's basis, all carries out institutional advancement through each component to the component system, and great degree reaches energy-efficient purpose, and this system architecture is also compact simultaneously, and area is little, can form the integrated configuration and popularize and apply in present mill, and the environmental protection and energy saving effect of this system is better, and equipment cost is lower, has good market prospect.

In the high-efficiency energy-saving type two-stage screw air compressor system, the two-stage screw air compressor is directly connected with the driving motor and the screw assembly by adopting the embedded integral shaft, and the two-stage screw assembly is respectively driven by adopting two independent driving motors, power transmission assemblies such as gears, couplers and the like in the traditional double-screw compressor are cancelled, so that the adverse effects caused by the phenomena of pitting corrosion or tooth breakage of the gears, coupler faults and the like can be effectively avoided, the power transmission efficiency of the air compressor is improved, the air compressor is always in the optimal running state, and a better energy-saving effect can be obtained on the premise of stable running of the air compressor; simultaneously, the setting of air intake department flow distribution plate can be fast with air dispersion to the twin-screw subassembly periphery, improves gas compression's homogeneity, improves compression efficiency simultaneously, further improves the energy-conserving effect of air compressor machine, also avoids the air current to get into the normal operating that first twin-screw subassembly is influenced to the first twin-screw subassembly of direct impact after the one-level die cavity. In addition, the bearing assembly is arranged at the end part of each double-screw assembly, and the bearing assembly is a sealing assembly of the double-screw assembly, so that the leakage of lubricating oil can be effectively prevented, and the fault of the air compressor caused by the leakage of the lubricating oil is avoided; meanwhile, the bearings of different types are matched, and the gaskets are arranged between the bearings, so that the impact resistance of the double-screw assembly and the bearing assembly can be effectively improved, and the service life of the air compressor is prolonged. Through set up independent heat dissipation shell on each driving motor, combine the fan use of driving motor rear end, can carry out independent air-cooled cooling to driving motor, make driving motor's cooling need not to rely on the cooling system of air compressor machine, effectively improve the stability of air compressor machine operation, also reduce the energy consumption of air compressor machine simultaneously. In practical application, the cooling device can be used by combining with a cooling system of an air compressor, and a very good cooling effect can be achieved.

In this energy-efficient formula doublestage screw compressor machine system, adopt the built-in cross temperature-sensing valve that has oily filter, can balance the relation between the required energy consumption of lubricating oil temperature and cooling betterly, under the prerequisite that the lubricating oil temperature is suitable guaranteeing, the required energy consumption of great degree reduction cooling to reach environmental protection and energy saving's purpose, also can play fine guard action to the doublestage screw compressor machine simultaneously, provide the guarantee for entire system's normal operating. Meanwhile, the directly sent lubricating oil or the cooled lubricating oil can be filtered through the oil filter before being output from the cold oil outlet, so that the influence on the normal operation of the equipment caused by the impurities entering the double-stage screw air compressor can be effectively avoided.

In this energy-efficient formula doublestage screw compressor machine system, adopt the air-cooled cooler of two cooling channels, can cool off lubricating oil and compressed air respectively simultaneously, its cooling efficiency is high, simultaneously, carry out the cooling of lubricating oil and compressed air in same cooler, the use of reducible cooler simplifies the equipment structure of whole air compressor machine system, avoids a large amount of pipe-lines to use and occupies a large amount of installation areas, makes entire system's structure compacter, reduction equipment cost.

In the high-efficiency energy-saving two-stage screw air compressor system, the gas-liquid separation device with the built-in filter element is adopted, the filter element, the inner cylinder and the outer cylinder are sequentially and coaxially arranged from inside to outside, the structure of the gas-liquid separation device can be simplified, the height of the gas-liquid separation device is reduced, the installation structure of the filter element is stable and reliable, the service life is long, meanwhile, the inclined structure of the outer wall of the inner cylinder is utilized, a good flow guiding effect is realized on oil gas entering the gas-liquid separation device, the separation efficiency of the oil gas can be effectively improved, and a good foundation is provided for the stable.

Drawings

Fig. 1 is a schematic diagram of the high-efficiency energy-saving two-stage screw air compressor system.

Fig. 2 is a schematic structural diagram of a two-stage screw air compressor.

Fig. 3 is a cross-sectional view a-a of a single drive motor (i.e., either the first drive motor or the second drive motor) of fig. 2.

Fig. 4 is a schematic structural view of the gas-liquid separation device.

Fig. 5 is a plan view of the gas-liquid separation device.

In the above figures, the components indicated by the respective reference numerals are as follows: 1 is a two-stage screw air compressor, 1-1 is an oil-gas outlet, 1-2 is a lubricating oil inlet, 1-3 is an air inlet, 2 is a gas-liquid separation device, 2-1 is an oil-gas inlet, 2-2 is a lubricating oil outlet, 2-3 is a compressed air outlet, 3 is a cooler, 3-1 is an oil inlet, 3-2 is an oil outlet, 3-3 is an air inlet, 3-4 is an air outlet, 4 is a temperature control valve, 4-1 is a hot oil inlet, 4-2 is a hot oil outlet, 4-3 is a cold oil inlet, 4-4 is a cold oil outlet, 5 is an air filter, 6 is an installation part, and 7 is an oil filter;

8, 9, 10, 11, 12, 13, 14, 15, 16, a splitter plate, 17-1, an adjusting gasket, 17-2, 17-3, a middle gasket, 17-4, a second bearing, 17-5, a locking nut, 18, a heat dissipation shell, 19, a motor stator, 20, a motor shell and 21, wherein the first driving motor is a first driving motor, the second driving motor is a second driving motor, the first double-screw assembly is a second double-screw assembly, the second double-screw assembly is a shell, the second double-screw assembly is a second cavity, the wind pipe is a second cavity, the splitter plate is a flow distribution plate, the bearing assembly is a;

22 is a lubricating oil channel, 23 is a compressed air channel, and 24 is a fan component;

25 is an outer cylinder body, 26 is an inner cylinder body, 27 is a filter core, 28 is an upper cover, 29 is an installation fixing ring, 30 is an oil filling port, 31 is an oil observation mirror, 32 is a pressure gauge and 33 is a safety valve;

and 34 is an air pressure adjusting pipeline.

Detailed Description

The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.

Examples

The embodiment provides a high-efficient energy-saving double-stage screw air compressor system, as shown in fig. 1, including double-stage screw air compressor 1, gas-liquid separation device 2, cooler 3, temperature-sensing valve 4, air cleaner 5 and installation department 6, double-stage screw air compressor, gas-liquid separation device, cooler, temperature-sensing valve and air cleaner locate respectively in the installation department and interconnect forms circulation circuit, and this air compressor system forms integral type equipment.

As shown in figure 1, the double-stage screw compressor is provided with an air inlet 1-3, a lubricating oil inlet 1-2 and an oil-gas outlet 1-1, the gas-liquid separation device is provided with an oil-gas inlet 2-1, a lubricating oil outlet 2-2 and a compressed air outlet 2-3, the temperature control valve is provided with a hot oil inlet 4-1, a hot oil outlet 4-2, a cold oil inlet 4-3 and a cold oil outlet 4-4, the cooler is provided with an oil inlet 3-1, an oil outlet 3-2, an air inlet 3-3 and an air outlet 3-4, the air inlet on the double-stage screw compressor is provided with an air filter, the oil-gas outlet is connected with the oil-gas inlet on the gas-liquid separation device, the lubricating oil outlet on the gas-liquid separation device is connected with the hot oil inlet on the temperature, and a hot oil outlet on the temperature control valve is connected with an oil inlet on the cooler, an oil outlet on the cooler is connected with a cold oil inlet on the temperature control valve, and a cold oil outlet on the temperature control valve is connected with a lubricating oil inlet on the two-stage screw air compressor. The air filter filters outside air entering the two-stage screw air compressor, compressed air with lubricating oil is formed after the two-stage screw air compressor performs air compression, the compressed air is separated by the gas-liquid separation device, the compressed air obtained after separation is directly cooled by the cooler and sent out, the lubricating oil obtained after separation is the lubricating oil, the temperature of the lubricating oil is firstly detected by the temperature control valve, and then whether the lubricating oil needs to be cooled by the cooler and then recycled is determined, so that the cooling capacity of the lubricating oil is accurately controlled, meanwhile, the temperature of the recycled lubricating oil is appropriate, and the normal operation of the two-stage screw air compressor is ensured.

In the system, the two-stage screw air compressor, the gas-liquid separation device, the cooler, the temperature control valve and the air filter are connected through pipelines, and the concrete structure of each main component part is as follows:

(1) as shown in fig. 1, the temperature control valve is a four-way valve with an oil filter 7 built therein, and a temperature control element (not shown in the figure) for detecting the oil temperature at the hot oil inlet in real time is provided in the temperature control valve. The temperature control element is used for detecting the oil temperature at the hot oil inlet in real time, when the oil temperature does not exceed a set value, the lubricating oil does not need to be cooled, the hot oil outlet is closed, and the lubricating oil is directly conveyed to the two-stage screw air compressor from the cold oil outlet; and when the oil temperature reaches or exceeds a set value, a hot oil outlet is opened, and the lubricating oil is conveyed to a cooler from the hot oil outlet for cooling. Lubricating oil is filtered through the oil filter before being output from the cold oil outlet, so that impurities can be effectively prevented from entering the two-stage screw air compressor to influence the normal operation of the equipment. In this embodiment, the critical temperature of the temperature control element in the thermo-valve is 70 ℃. According to the actual requirement of the air compression host, the user can adjust and set the critical temperature.

(2) As shown in fig. 2, the two-stage screw air compressor adopts a direct-connected air compressor without gear transmission loss, including a first driving motor 8, a second driving motor 9, a first double-screw component 10, a second double-screw component 11 and a casing 12, a first-stage cavity 13 and a second-stage cavity 14 are formed inside the casing, the first-stage cavity and the second-stage cavity are communicated through an air pipe 15, the first double-screw component is arranged in the first-stage cavity, the second double-screw component is arranged in the second-stage cavity, a motor shaft of the first driving motor and a screw shaft in the first double-screw component are the same rotating shaft, and a motor shaft of the second driving motor and a screw shaft in the second double-screw component are the same rotating shaft. In the structure, under the power action of a first driving motor, a first double-screw assembly performs primary compression on air in a primary cavity, and under the power action of a second driving motor, a second double-screw assembly performs secondary compression on the air which has undergone the primary compression in a secondary cavity; the drive motor and the screw rod which are positioned at the same level are directly connected by adopting an embedded integral shaft, namely, the rotating shaft is used as a motor shaft of the drive motor and also used as a drive screw shaft of the double-screw assembly, power transmission assemblies such as gears, couplers and the like in the traditional double-screw compressor are eliminated, the adverse effects caused by the phenomena of pitting corrosion or tooth breakage of the gears, coupler faults and the like can be effectively avoided, and the power transmission efficiency can be effectively improved. The air pipe between the first-stage cavity and the second-stage cavity can be a connecting channel integrally formed by the casing, and a connecting pipeline externally arranged on the casing can also be adopted.

A flow distribution plate 16 is further arranged in the two-stage screw air compressor, an air inlet 1-3 is formed in one side of the first-stage cavity, an oil-gas outlet 1-1 is formed in one side of the second-stage cavity, the flow distribution plate is arranged in the first-stage cavity between the air inlet and the first double-screw assembly, and the length of the flow distribution plate is larger than the diameter of the air inlet and smaller than the length of the first double-screw assembly. The setting of air intlet department flow distribution plate can get up the water conservancy diversion effect after the air admission air intlet, disperses the air to the twin-screw subassembly periphery fast, can effectively improve gas compression's homogeneity, improves compression efficiency simultaneously, also avoids the air current to get into the first twin-screw subassembly of direct impact behind the one-level die cavity. In this embodiment, the splitter plate is spherical, the projection surface of the splitter plate is larger than that of the air inlet, and the projection surface of the splitter plate covers the projection surface of the air inlet, so that the splitter plate can split all air entering the air inlet; a gap is reserved between one side of the flow distribution plate and the inner side face of the first-stage cavity, and a gap is also reserved between the other side of the flow distribution plate and the surface of the first double-screw assembly. The flow distribution plate is suspended in a space between the inner side surface of the first-stage cavity and the first twin-screw assembly, gaps reserved on two sides allow airflow to pass through, and meanwhile, the normal operation of the first twin-screw assembly is prevented from being interfered by the arrangement of the flow distribution plate. When the splitter plate is installed, the splitter plate can be fixedly installed on the inner side of the primary cavity through a conventional fixing mode (such as a long bolt and the like). The flow distribution plate adopts a flexible plate, is convenient to install and replace and has better guidance quality.

The first driving motor and the second driving motor are both permanent magnet motors; the permanent magnets are arranged in the motor rotors of the first driving motor and the second driving motor, the high-performance Ru-Fe-B permanent magnets existing in the market can be adopted, and the permanent magnets are guaranteed not to lose magnetism in the life cycle of the air compressor. The first double-screw assembly and the second double-screw assembly are arranged up and down and are meshed with each other; the first double-screw assembly and the second double-screw assembly respectively comprise two screws, and the screws arranged above the first double-screw assembly and the second double-screw assembly are male screws; the screw shaft of the male screw in the first double-screw assembly extends to form an integral structure with the motor shaft of the first driving motor, and the screw shaft of the male screw in the second double-screw assembly extends to form an integral structure with the motor shaft of the second driving motor.

As shown in fig. 2, in the first and second double-screw assemblies, at the end opposite to the first and second driving motors, the outer circumference of the end of each screw is connected to the housing through a bearing assembly 17; the bearing assembly comprises an adjusting gasket 17-1, a first bearing 17-2, a middle gasket 17-3, a second bearing 17-4 and a locking nut 17-5 which are coaxially arranged in sequence. The bearing assembly is a sealing assembly of the double-screw assembly, so that the leakage of lubricating oil can be effectively prevented, and the fault of the air compressor caused by the leakage of the lubricating oil is avoided; meanwhile, the bearings of different types are matched, and the gaskets are arranged between the bearings, so that the impact resistance of the double-screw assembly and the bearing assembly can be effectively improved, and the service life of the air compressor is prolonged. The first bearing adopts a cylindrical roller bearing, and the second bearing adopts a tapered roller bearing.

As shown in fig. 2 or fig. 3, the first driving motor and the second driving motor have the same structure, and the peripheries of the motor stators of the first driving motor and the second driving motor are respectively provided with a heat dissipation shell 18; the heat dissipation shell is of an integral structure and comprises a shell body 18-1 and heat dissipation fins 18-2 which are connected, and the heat dissipation fins are uniformly distributed on the periphery of the shell body. The heat dissipating fins are inclined, parallel or wavy relative to the axis of the housing body, and are selectively arranged according to the width and requirement of the gap between the driving motor stator 19 and the motor housing 20. Under the action of the fan 21 at the rear end of the driving motor, the heat dissipation casing can better dissipate heat of the stator and the rotor of the driving motor, and hot air generated after cooling is discharged from a through hole formed in the motor casing (as shown by an arrow in fig. 2). The setting of this heat dissipation shell can carry out independent air-cooled cooling to driving motor, makes driving motor's cooling need not to rely on the cooling system of air compressor machine, can effectively improve the stability of air compressor machine operation, also reduces the energy consumption of air compressor machine simultaneously. In practical application, the cooling device can be used by combining with a cooling system of an air compressor, and a very good cooling effect can be achieved.

When the two-stage screw air compressor is used, the principle is as follows: in the traditional gear connection type air compressor, the gear ratio is fixed, so the point efficiency is emphasized, namely the specific power is optimal only under fixed rotating speed and rated pressure, when the variable-frequency variable-speed operation is required, the gear ratio is fixed, so the energy consumption cannot be synchronously reduced even if the rotating speed is reduced, therefore, the two-stage screw air compressor in the system adopts an embedded integral shaft to be directly connected with a driving motor and a screw assembly, and the two-stage screw assembly is respectively driven by two independent driving motors, so the air compressor can always operate at the optimal interstage pressure point under the conditions of different rotating speeds and different pressures by controlling the interstage pressure, the air compressor is always in the optimal operating state, and a better energy-saving effect can be obtained on the premise of stable operation of the air compressor; meanwhile, the splitter plate is arranged at the air inlet of the air compressor, so that airflow entering the air compressor can be dispersed and guided, the air can be rapidly and uniformly dispersed at the periphery of the double-screw assembly, higher compression efficiency and uniform compression flow can be achieved, and the energy-saving effect of the air compressor can be further improved; in addition, the end parts of the double-screw components are provided with bearing assemblies with sealing performance, so that lubricating oil leakage can be effectively prevented, and the shock resistance of the double-screw components and the bearing assemblies is improved and the service life of the air compressor is prolonged by adopting different types of bearings for matching and arranging gaskets between the bearings; each driving motor is used by combining the fan at the rear end of the driving motor through arranging an independent heat dissipation shell, independent air cooling can be carried out on the driving motor, the cooling of the driving motor is not required to depend on a cooling system of the air compressor, the running stability of the air compressor is effectively improved, and the energy consumption of the air compressor is further reduced.

(3) As shown in fig. 1, the cooler is an air-cooled cooler with double cooling channels, a lubricating oil cooling channel 22 and a compressed air cooling channel 23 which are independent of each other are arranged in the cooler, the two ends of the lubricating oil cooling channel are respectively an oil inlet and an oil outlet, and the two ends of the compressed air cooling channel are respectively an air inlet end and an air outlet end; the lubricating oil cooling channel and the compressed air cooling channel are arranged in parallel, a fan assembly 24 is arranged on the outer side of the lubricating oil cooling channel and/or the compressed air cooling channel, and the air outlet direction of the fan assembly is perpendicular to the flowing direction of lubricating oil and compressed air.

(4) As shown in fig. 4 or 5, the gas-liquid separation device adopts a separation device with a built-in filter element, and comprises an outer cylinder body 25, an inner cylinder 26, a filter element 27, an upper cover 28 and a mounting and fixing ring 29, wherein the inner cylinder is arranged inside the outer cylinder body, the filter element is arranged in the inner cylinder, the upper end of the outer cylinder body and the upper end of the inner cylinder are respectively and fixedly connected with the bottom surface of the mounting and fixing ring, the top surface of the mounting and fixing ring is provided with a concave annular surface, the upper end of the filter element is provided with a mounting part extending towards the periphery, the mounting part is embedded on the annular surface, and the upper cover; the lateral wall of outer barrel is equipped with oil gas import and lubricating oil export, and the upper cover is equipped with the compressed air export. Wherein, form the separation structure of first order between outer barrel and the inner tube, form the separation structure of second level between filter core and the inner tube, the lubricating oil that obtains after the separation subsides in the bottom of outer barrel, then stretch out and send out to the temperature-sensing valve by the pipeline of lubricating oil outlet to outer barrel bottom, and the compressed air that obtains after the separation is sent out to the cooler from the compressed air exit on the upper cover. The mounting fixing ring is mainly used for fixedly mounting the outer barrel and the inner barrel, and simultaneously provides a stable mounting platform for the filter element, so that the stability of the structure of the gas-liquid separation device is ensured.

Wherein, the lateral wall of inner tube is the slope form, and this embodiment is as an optimal scheme, and the inclination of inner tube lateral wall is 3 ~ 15. The inner cylinder is integrally in a micro-horn shape arranged from top to bottom, the inclined side wall of the inner cylinder has a good flow guiding effect on oil gas entering the gas-liquid separation device, and lubricating oil contained in the oil gas gradually flows along the side wall and then descends to the bottom of the outer cylinder body after attaching to the side wall of the inner cylinder. Meanwhile, the height of the inner cylinder in the embodiment is about 1/2 of the height of the outer cylinder; the oil gas inlet is arranged on the upper part of the side wall of the outer cylinder body, which is positioned at the outer side of the inner cylinder, and the hot oil outlet is arranged on the lower part of the side wall of the outer cylinder body, which is positioned at the lower part of the inner cylinder. A first oil-gas channel is reserved between the outer wall of the inner cylinder and the inner wall of the outer cylinder, and a second oil-gas channel is reserved between the outer wall of the filter element and the inner wall of the inner cylinder; the central line of the oil gas inlet is tangent to the inner wall of the outer cylinder (as shown in fig. 5), so that the oil gas can be uniformly distributed along the outer wall of the inner cylinder after entering the first oil gas channel.

The filter element can adopt an integrated structure, and the mounting part is a circular ring which is formed by directly extending the upper end of the filter element to the periphery; also can adopt split type structure, the filter core main part is cylindric structure, and the upper end of filter core main part is equipped with the hoop, and the hoop upper end extends to the periphery and forms the installation department, and the filter core passes through the hoop and presss from both sides tight fixed mounting. In this embodiment, the filter core adopts the integral type structure.

In addition, the side wall of the outer cylinder body is also respectively provided with an oil filling port 30 and installation through holes for installing devices such as an oil observation mirror 31, a pressure gauge 32, a safety valve 33 and the like (the structure mode is the same as that of the traditional gas-liquid separation device, and the installation through holes can be set according to the actual requirement of the device).

In the gas-liquid separation device, oil gas (namely compressed air with lubricating oil) enters the outer cylinder body from an oil gas inlet, is diffused to the periphery of the inner cylinder in the first oil gas channel and impacts the outer wall of the inner cylinder, and at the moment, part of the lubricating oil is separated out and attached to the outer wall of the inner cylinder and drips to the bottom of the outer cylinder body along the outer wall of the inner cylinder to realize first-stage separation; afterwards, under cooler and external pumping mechanism effect, oil gas rises in the inner tube, and the in-process part lubricating oil that rises subsides in outer barrel bottom, rises to filter core department, filters by the filter core, and lubricating oil is appeared completely and is collected in outer barrel bottom along the drippage of filter core outer wall, realizes the second grade separation, and the compressed air who obtains after filtering by the filter core is seen off by the compressed air exit of upper cover, and the lubricating oil that subsides in outer barrel bottom is seen off by the lubricating oil export.

(5) In this embodiment, the installation department adopts rack construction, according to the actual installation demand of air compressor machine system, and the installation department also can adopt quick-witted case structure. The installation part mainly plays a supporting role and encapsulates the two-stage screw air compressor system to form an integral structure. In addition, an air pressure adjusting pipeline 34 and a necessary electromagnetic valve (shown in fig. 1) are arranged among the air filter, the two-stage screw air compressor and the gas-liquid separation device, the adjusting mode is the same as that of the traditional air compressor system, and the specific installation position of the pipeline can be selected according to the actual condition of the system.

As described above, the present invention can be realized well, and the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; all equivalent changes and modifications made according to the present invention are intended to be covered by the scope of the claims of the present invention.

Claims

1. A high-efficiency energy-saving two-stage screw air compressor system is characterized by comprising a two-stage screw air compressor, a gas-liquid separation device, a cooler, a temperature control valve and an air filter; the two-stage screw compressor is provided with an air inlet, a lubricating oil inlet and an oil-gas outlet, the gas-liquid separation device is provided with an oil-gas inlet, a lubricating oil outlet and a compressed air outlet, the temperature control valve is provided with a hot oil inlet and a hot oil outlet, the cooling oil inlet and the cooling oil outlet are arranged on the cooler, an oil inlet, an oil outlet, an air inlet end and an air outlet end are arranged on the cooler, an air filter is arranged at the air inlet on the double-stage screw air compressor, the oil-gas outlet is connected with the oil-gas inlet on the gas-liquid separation device, the lubricating oil outlet on the gas-liquid separation device is connected with the hot oil inlet on the temperature control valve, the compressed air outlet is connected with the air inlet end on the cooler, the hot oil outlet on the temperature control valve is connected with the oil inlet on the cooler, the oil outlet on the cooler is connected with the cooling oil inlet on the temperature control valve, and the cooling oil outlet on.

2. The system of claim 1, wherein the thermostatic valve is a four-way valve with an oil filter, and a temperature control element is disposed in the thermostatic valve for real-time detection of oil temperature at the hot oil inlet.

3. The system of claim 1, wherein the two-stage screw air compressor is a direct-coupled air compressor without gear loss, and comprises a first driving motor, a second driving motor, a first double-screw assembly, a second double-screw assembly and a casing, wherein a first-stage cavity and a second-stage cavity are formed inside the casing, the first-stage cavity and the second-stage cavity are communicated with each other through an air duct, the first double-screw assembly is disposed in the first-stage cavity, the second double-screw assembly is disposed in the second-stage cavity, a motor shaft of the first driving motor and a screw shaft of the first double-screw assembly are the same rotating shaft, and a motor shaft of the second driving motor and a screw shaft of the second double-screw assembly are the same rotating shaft.

4. The system of claim 3, wherein a splitter plate is further disposed in the dual-stage screw air compressor, an air inlet is disposed on one side of the first-stage cavity, an oil-gas outlet is disposed on one side of the second-stage cavity, the splitter plate is disposed in the first-stage cavity between the air inlet and the first dual-screw assembly, and the length of the splitter plate is greater than the diameter of the air inlet and less than the length of the first dual-screw assembly.

5. The efficient energy-saving two-stage screw air compressor system according to claim 3, wherein the first and second driving motors are permanent magnet motors;

6. The system of claim 5, wherein the first and second twin-screw assemblies have ends opposite to the first and second drive motors, and the outer peripheries of the ends of the screws are connected to the casing through bearing assemblies, respectively; the bearing assembly comprises an adjusting gasket, a first bearing, a middle gasket, a second bearing and a locking nut which are coaxially arranged in sequence.

7. The high-efficiency energy-saving two-stage screw air compressor system according to claim 3, wherein the first and second driving motors have the same structure, and heat dissipation housings are respectively arranged on the peripheries of the motor stators of the first and second driving motors; the heat dissipation shell is of an integrated structure and comprises a shell body and heat dissipation fins which are connected, and the heat dissipation fins are uniformly distributed on the periphery of the shell body.

8. The high-efficiency energy-saving two-stage screw air compressor system according to claim 1, wherein the cooler is an air-cooled cooler with two cooling channels, a lubricating oil cooling channel and a compressed air cooling channel which are independent of each other are arranged in the cooler, an oil inlet and an oil outlet are respectively arranged at two ends of the lubricating oil cooling channel, and an air inlet and an air outlet are respectively arranged at two ends of the compressed air cooling channel;

9. The high-efficiency energy-saving two-stage screw air compressor system according to claim 1, wherein the gas-liquid separation device is a separation device with a built-in filter element, and comprises an outer cylinder, an inner cylinder, a filter element, an upper cover and a mounting and fixing ring, the inner cylinder is arranged inside the outer cylinder, the filter element is arranged in the inner cylinder, the upper end of the outer cylinder and the upper end of the inner cylinder are respectively and fixedly connected with the bottom surface of the mounting and fixing ring, the top surface of the mounting and fixing ring is provided with a concave circular ring surface, the upper end of the filter element is provided with a mounting part extending towards the periphery, the mounting part is embedded in the circular ring surface, and the upper cover is tightly pressed; the side wall of the outer cylinder body is provided with an oil gas inlet and a lubricating oil outlet, and the upper cover is provided with a compressed air outlet; the side wall of the inner cylinder is inclined.

10. The high-efficiency energy-saving two-stage screw air compressor system according to claim 1, further comprising an installation part, wherein the two-stage screw air compressor, the gas-liquid separation device, the cooler, the temperature control valve and the air filter are all arranged in the installation part and form a circulation loop;

the mounting part is of a rack type structure or a chassis type structure.