Energy-saving screw air compressor

Abstract

The invention discloses an energy-saving screw type air compressor, which relates to the technical field of compressors, comprises a machine body bottom plate, a machine body top cover, an auxiliary air suction structure, an auxiliary heat dissipation structure and a heat exchange structure, and is characterized in that the working state of a main motor is cooled and dissipated in multiple modes, the operating temperature of the main motor is reduced, and the operating stability of the main motor is improved; meanwhile, the heat energy utilization rate is increased through the heat exchange assembly, meanwhile, the temperature of air flow to be sucked is increased, the water content of air is reduced, and the situation that lubricating oil is emulsified due to water vapor and the operation stability of a screw and a main motor is affected by the too large temperature difference between the two ends in the compression main machine is avoided; and finally, through an adjustable electric heating assembly, under the low-temperature cold start working condition, it is guaranteed that the unit is rapidly started and recovered to the normal working state.

Description

Technical Field

[0001] The present invention relates to air compressor technology, and specifically to an energy-saving screw air compressor. Background Art

[0002] As is well known, a screw air compressor is a positive displacement compressor. Its core components are a pair of meshing male and female rotors. Under the power output of the main motor, air is compressed between the rotor tooth grooves through the rotation of the rotors, completing the three working processes of suction, compression, and exhaust. This type of compressor has characteristics such as high efficiency and compact structure, and is widely used in many fields.

[0003] The deficiencies of the prior art are as follows. Currently, during the use of a screw air compressor, the main motor providing power usually uses a natural cooling method for cooling. After long-term continuous use, the temperature of the main motor will increase, increasing its energy consumption and affecting its service life. There is still room for improvement in the cooling efficiency and cooling method of the main motor. At the same time, for existing screw air compressors, air is directly inhaled. When the compressor is used in cold, humid, or other environments, the water content in the air is relatively large. When directly discharged into the compression host and combined with the lubricating oil, it is easy to cause emulsification of the lubricating oil, increasing energy consumption and affecting the lubrication effect. Moreover, due to the relatively low temperature of the air at the suction end and the relatively high temperature of the air at the exhaust end, the temperature fluctuation range inside the compression host is relatively large, and the operating stability of the compression host and the main motor will also be affected, thereby increasing energy consumption. Summary of the Invention

[0004] The purpose of the present invention is to provide an energy-saving screw air compressor to solve the above deficiencies in the prior art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions: including a machine body bottom plate for carrying the core components of the screw air compressor and a machine body top cover cooperating with the machine body side enclosure to isolate the unit equipment. The main motor and the compression host are respectively installed on the top of the machine body bottom plate, and the power output end of the main motor is connected to the power input end of the active screw inside the compression host;

[0006] At the air intake end on the top of the compression host, there is an air supply pipe connected to the end of the screw inside the compression host to realize the input of the air source for the compression host to compress air. Inside the air supply pipe at the air intake end, there are various air intake methods to realize the pretreatment of the air source to be compressed;

[0007] An auxiliary air suction structure is provided at the top of the main motor and is connected to the air inlet end of the air supply pipe through the auxiliary air suction structure. The auxiliary air suction structure continuously sucks the air flow on the outer periphery of the main motor to prevent the formation of a range of hot spots on the outer periphery of the main motor due to long-term operation. An auxiliary heat dissipation mechanism is provided at the bottom of the main motor. The auxiliary heat dissipation mechanism uses the cooled lubricating oil to cool the bottom position of the main motor, and at the same time uses the heat conductivity of the main motor housing structure to reduce the overall operating temperature of the main motor, and at the same time returns the used lubricating oil to the lubricating oil cooling system.

[0008] As a further description of the above technical solution: An air filter cartridge for installing an air intake filter element is provided at the air inlet end of the air supply pipe. An air inlet pipe and a connecting pipe are provided at the air inlet end of the air filter cartridge. A communicating pipe is installed at the air outlet end of the air filter cartridge and is connected to the air inlet end of the air supply pipe through the communicating pipe. An air inlet valve is installed at the connection between the air supply pipe and the end of the communicating pipe to adjust the air intake system of the air compressor.

[0009] As a further description of the above technical solution: The auxiliary air suction structure installs the gas inlet pipe to the outer peripheral position of the top of the main motor through an arc-shaped cover fixed to the side of the end of the main motor. A gas recovery pipe communicating with the connecting pipe is provided at the air outlet end of the arc-shaped cover. A communicating flow cavity is provided inside the gas recovery pipe, the arc-shaped cover and the gas inlet pipe. The air flow near the outer periphery of the main motor is sucked through the flow cavity and the gas recovery pipe and transported into the air filter cartridge for filtration.

[0010] As a further description of the above technical solution: The auxiliary heat dissipation mechanism, a cooling oil tank is welded at the bottom position of the main motor, and motor fins are integrally formed on the outer periphery of the main motor housing. The motor fins at the bottom outer periphery of the main motor are inserted into the cooling oil tank. A cooling cavity for the flow of cooled lubricating oil is provided inside the cooling oil tank. The lubricating oil after cooling enters the cooling oil tank to cool the bottom of the main motor and then is discharged and returned to the lubricating oil cooling system.

[0011] As a further description of the above technical solution: An oil cylinder is installed vertically on one side of the top of the machine body bottom plate. When the compression main engine works, the oil-gas mixture discharged after compression by the internal screw structure is discharged into the oil cylinder. An oil-gas separator is installed in cooperation with the top of the oil cylinder. The oil-gas mixture entering the oil cylinder from the compression main engine is separated by the oil-gas separator to form pure gas and pure oil.

[0012] As a further description of the above technical solution: A heat exchange coil is installed inside the air inlet pipe, and an oil liquid inlet pipe connected to the oil cylinder is provided at the inlet end of the heat exchange coil. The high-temperature lubricating oil discharged from the oil cylinder is discharged into the heat exchange coil through the oil liquid inlet pipe. Heat dissipation fins are welded on the outer periphery of the heat exchange coil to improve the heat exchange effect of the heat exchange coil during operation.

[0013] As a further description of the above technical solution: A heat exchange plate is installed on one side of the bottom of the machine body top cover. An oil discharge pipe extending to the outside of the intake pipe is provided at the discharge end of the heat exchange coil. The liquid inlet end of the heat exchange plate is connected to the oil discharge pipe. The lubricating oil used inside the heat exchange coil is discharged into the heat exchange plate through the oil discharge pipe for cooling. A cooling fan is embedded at the top position of the heat exchange plate inside the machine body top cover. The cooling fan and the heat exchange plate are used together to cool and reduce the temperature of the high-temperature lubricating oil after use.

[0014] As a further description of the above technical solution: A circulation pump is installed on one side of the bottom of the machine body top cover. The discharge end of the oil discharge pipe is connected to the inlet end of the heat exchange plate through the circulation pump. A liquid supply pipe is installed at the discharge end of the heat exchange plate and is connected to the oil inlet end of the cooling oil tank through the liquid supply pipe. A shunt pipe connected to the oil inlet end of the compression main engine is provided on the surface of the liquid supply pipe. The lubricating oil cooled by the cooperation of the heat exchange plate and the cooling fan is input into the cooling oil tank through the liquid supply pipe to cool the bottom of the main motor, and then flows back to the lubricating oil cooling system.

[0015] As a further description of the above technical solution: Flow guide plates are stagger-welded on both sides of the inner wall of the cooling oil tank. An output pipe communicating with the oil discharge pipe is installed at the discharge end of the cooling oil tank. The flow guide plates are used to limit the intervals inside the cooling cavity, so that the lubricating oil entering the cooling oil tank flows according to the preset flow path of the flow guide plates, ensuring the cooling effect on the bottom of the main motor. Arc-shaped grooves are provided on both sides of the top of the cooling oil tank. The arc-shaped groove structure enables the cooling oil tank to better fit the bottom of the main motor during welding, achieving a perfect fit with the bottom of the main motor and ensuring the sealing performance of the connection.

[0016] As a further description of the above technical solution, intake end pipes are evenly installed at equal intervals on the surface of the gas inlet pipe facing the outer circumference of the main motor. The intake end pipes are all connected to the inside of the flow cavity. The air flow drawn in around the main motor enters the flow cavity through the intake end pipes and is discharged along the gas recovery pipe. Installation holes corresponding to the installation positions of the ends of the main motor are provided on both sides inside the arc-shaped cover. Pre-drilled holes are provided on the side of the main motor. When the arc-shaped cover fits the side of the end of the main motor, fasteners are screwed in between the installation holes to fix the position of the arc-shaped cover. An electric heating wire and a temperature monitoring sensor are installed inside the air supply pipe.

[0017] The present invention has the following advantages:

[0018] 1. Reduce the energy consumption of the main motor: Through the auxiliary air suction structure, it is possible to exhaust the air flow near the outer periphery of the main motor, avoiding the local temperature rise near the outer periphery of the main motor due to poor fluidity, long service time, etc., forming a regional hot spot. By exhausting the air near the outer periphery of the main motor, the working temperature of the main motor is reduced, thereby reducing its energy consumption. At the same time, the heat dissipated from the outer periphery of the motor can be utilized to assist in increasing the temperature of the inhaled air.

[0019] 2. Auxiliary heat dissipation structure: The screw air compressor is equipped with a lubricating oil cooling system. By discharging part of the cooled lubricating oil into the cooling oil tank, the temperature of the bottom position of the main motor can be further reduced. At the same time, using the excellent heat conductivity of the main motor housing structure, the overall working temperature of the main motor can be further reduced.

[0020] 3. Increase the intake air temperature: Through the heat exchange coil arranged inside the intake pipe, the used high-temperature lubricating oil first enters the heat exchange coil. The heat dissipation fins are used to improve the heat exchange efficiency with the inhaled air, increasing the thermal energy utilization rate while increasing the temperature of the air flow to be inhaled, reducing the water content, and avoiding the emulsification of the lubricating oil caused by water vapor and the influence of too large temperature difference at both ends inside the compression main unit on the operation stability of the screw and the main motor.

[0021] 4. Auxiliary heating system: An electric heating wire component is added to the intake air system. When needed, it can be turned on to significantly increase the temperature of the inhaled air. It is applied under the working condition of low-temperature cold start of the unit. On the one hand, it increases the temperature of the inhaled air, and on the other hand, it heats the lubricating oil that has just started to work through the inhaled air flow, reducing the viscosity of the lubricating oil and enhancing its fluidity. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is the overall structure schematic diagram provided by the embodiment of the present invention;

[0024] Figure 2 It is the internal structure schematic diagram of the air supply pipe and the intake pipe provided by the embodiment of the present invention;

[0025] Figure 3 It is the heat exchange coil structure schematic diagram provided by the embodiment of the present invention;

[0026] Figure 4 It is the arc-shaped cover and gas inlet pipe structure schematic diagram provided by the embodiment of the present invention;

[0027] Figure 5 Schematic diagram of the internal structure of the arc-shaped cover and the gas inlet pipe provided by the embodiment of the present invention;

[0028] Figure 6 Schematic diagram of the side view of the end face of the main motor provided by the embodiment of the present invention;

[0029] Figure 7 Schematic diagram of the internal structure of the cooling oil tank provided by the embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 1. Body bottom plate; 2. Body top cover; 3. Main motor; 301. Motor fin; 4. Compression main unit; 5. Air supply pipe; 501. Connecting pipe; 502. Intake valve; 6. Oil cylinder; 601. Oil-gas separator; 7. Heat exchange plate; 701. Cooling fan; 8. Filter cartridge; 801. Intake pipe; 802. Heat exchange coil; 803. Heat dissipation fin; 804. Oil liquid inlet pipe; 805. Oil liquid discharge pipe; 9. Circulation pump; 901. Liquid supply pipe; 902. Cooling oil tank; 903. Cooling cavity; 904. Deflector; 905. Arc-shaped groove; 906. Output pipe; 907. Shunt pipe; 10. Arc-shaped cover; 1001. Gas inlet pipe; 1002. Gas recovery pipe; 1003. Flow cavity; 1004. Intake end pipe; 1005. Mounting hole; 1006. Connecting pipe; 11. Electric heating wire; 1101. Temperature monitoring sensor. Detailed implementation manners

[0032] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further introduced in detail below with reference to the accompanying drawings.

[0033] Please refer to Figures 1-7 , the embodiment of the present invention provides a technical solution for an energy-saving screw air compressor: including: a body bottom plate 1 for carrying the core components of the screw air compressor and a body top cover 2 for cooperating with the body side wall to isolate the unit equipment. The main motor 3 and the compression main unit 4 are respectively installed on the top of the body bottom plate 1, and the power output end of the main motor 3 is connected to the power input end of the active screw inside the compression main unit 4;

[0034] An air supply pipe 5 communicating with the end of the screw inside the compression main unit 4 is arranged at the air intake end on the top of the compression main unit 4 to realize the input of the air source for the compression main unit 4 to compress air. There are various air intake methods at the air intake end inside the air supply pipe 5 to realize the pretreatment of the air source to be compressed;

[0035] An auxiliary air suction structure is provided at the top of the main motor 3 and is connected to the intake end of the air supply pipe 5 through the auxiliary air suction structure. The auxiliary air suction structure continuously sucks the air flow on the outer periphery of the main motor 3 to prevent the formation of a range of hot spots on the outer periphery of the main motor 3 due to long-term operation. An auxiliary heat dissipation mechanism is provided at the bottom of the main motor 3. The auxiliary heat dissipation mechanism uses the cooled lubricating oil to cool the bottom position of the main motor 3, and at the same time uses the heat conductivity of the main motor 3 housing structure to reduce the overall operating temperature of the main motor 3. At the same time, the used lubricating oil is returned to the lubricating oil cooling system;

[0036] It should be noted that the body bottom plate 1, the body top cover 2 and the side wall plates of the unit cooperate to form a complete frame structure. Inside this frame structure, the components of the screw air compressor are installed and carried, and the external environment is isolated to ensure the normal operation of each component.

[0037] In another embodiment provided by the present invention: an air filter cartridge 8 for installing an intake air filter element is provided at the intake end of the air supply pipe 5. An intake pipe 801 and a connecting pipe 1006 are provided at the intake end of the air filter cartridge 8. A connecting pipe 501 is installed at the exhaust end of the air filter cartridge 8 and is connected to the intake end of the air supply pipe 5 through the connecting pipe 501. An intake valve 502 is installed at the connection between the air supply pipe 5 and the end of the connecting pipe 501 to realize the adjustment of the air intake system of the air compressor.

[0038] It should be noted that the air filter element structure is installed inside the air filter cartridge 8. Through the air filter element structure, the gas to be inhaled by the compression main unit 4 is deeply filtered to remove impurities in the air and avoid abrasion of the screw components inside the compression main unit 4. The external air is drawn in by the intake pipe 801 and the connecting pipe 1006, filtered by the filter element inside the air filter cartridge 8, and then input into the compression main unit 1 through the connecting pipe 501, the intake valve 502 and the air supply pipe 5.

[0039] In another embodiment provided by the present invention: for the auxiliary air suction structure, the gas inlet pipe 1001 is installed at the outer peripheral position of the top of the main motor 3 through the arc-shaped cover 10 fixed to the side of the end of the main motor 3. A gas recovery pipe 1002 communicating with the connecting pipe 1006 is provided at the exhaust end of the arc-shaped cover 10. A communicating cavity 1003 is provided in the gas recovery pipe 1002, the arc-shaped cover 10 and the gas inlet pipe 1001. The air flow near the outer periphery of the main motor 3 is sucked in through the communicating cavity 1003 and the gas recovery pipe 1002 and transported to the inside of the air filter cartridge 8 for filtration.

[0040] It should be noted that through the cooperation of the arc-shaped cover 10 and the gas inlet pipe 1001, it is installed at the outer peripheral top position of the main motor 3, which does not affect the normal operation and heat dissipation of the main motor 3. At the same time, when the compression main unit 4 sucks air, the air flow located on the outer periphery of the compression main unit 4 can be sucked in to accelerate the gas circulation on the outer periphery of the main motor 3.

[0041] In another embodiment provided by the present invention: an auxiliary heat dissipation mechanism. A cooling oil tank 902 is welded at the bottom of the main motor 3, and motor fins 301 are integrally formed on the outer periphery of the housing of the main motor 3. The motor fins 301 at the bottom of the outer periphery of the main motor 3 are inserted into the inside of the cooling oil tank 902. A cooling cavity 903 for the circulation of cooled lubricating oil is provided inside the cooling oil tank 902. The lubricating oil after temperature reduction enters the inside of the cooling oil tank 902 to cool the bottom of the main motor 3 and then is discharged and returned to the lubricating oil cooling system.

[0042] It should be noted that the cooling oil tank 902 provided at the bottom of the main motor 3 is connected to the discharge end of the heat exchange plate 7, so that part of the cooled lubricating oil is discharged into the inside of the cooling oil tank 902 for circulation. During the flow process inside the cooling cavity 903, the low temperature of the lubricating oil can further cool the main motor 3, improve its heat dissipation effect, and reduce its working temperature.

[0043] In another embodiment provided by the present invention: an oil cylinder 6 is vertically installed on one side of the top of the body bottom plate 1. When the compression main engine 4 works, the oil-gas mixture discharged after the internal screw structure is compressed is discharged into the inside of the oil cylinder 6. An oil-gas separator 601 is installed in cooperation with the top of the oil cylinder 6. The oil-gas mixture entering the inside of the oil cylinder 6 from the compression main engine 4 is separated by the oil-gas separator 601 to form pure gas and pure oil.

[0044] It should be noted that the oil-gas mixture compressed by the compression main engine 4 is discharged into the inside of the oil cylinder 6 and separated by the oil-gas separator 601, so that the lubricating oil remains inside the oil cylinder 6, while the compressed pure gas is discharged.

[0045] In another embodiment provided by the present invention: a heat exchange coil 802 is installed inside the air inlet pipe 801, and an oil inlet pipe 804 connected to the oil cylinder 6 is provided at the inlet end of the heat exchange coil 802. The high-temperature lubricating oil discharged from the inside of the oil cylinder 6 is discharged into the inside of the heat exchange coil 802 through the oil inlet pipe 804. Heat dissipation fins 803 are welded on the outer periphery of the heat exchange coil 802, and the heat exchange effect during the operation of the heat exchange coil 802 is improved through the heat dissipation fins 803.

[0046] It should be noted that through the structure of the heat exchange coil 802 installed inside the air inlet pipe 801 and the heat dissipation fins 803, the heat exchange treatment can be carried out between the high-temperature lubricating oil discharged from the oil cylinder 6 and the low-temperature gas inhaled by the air inlet pipe 801. The high-temperature lubricating oil is used to preheat the low-temperature gas, reduce the temperature of the lubricating oil, reduce the subsequent cooling energy consumption, and at the same time preheat the gas to be compressed and reduce the water content.

[0047] In another embodiment provided by the present invention: A heat exchange plate 7 is installed on one side of the bottom of the body top cover 2. The discharge end of the heat exchange coil 802 is provided with an oil discharge pipe 805 extending to the outside of the intake pipe 801. The liquid inlet end of the heat exchange plate 7 is connected to the oil discharge pipe 805. The lubricating oil used inside the heat exchange coil 802 is discharged into the heat exchange plate 7 through the oil discharge pipe 805 for cooling. Inside the body top cover 2, a cooling fan 701 is embedded at the top position of the heat exchange plate 7. The cooling fan 701 and the heat exchange plate 7 are used together to cool down the high-temperature lubricating oil after use.

[0048] It should be noted that through the cooperation of the heat exchange plate 7 and the cooling fan 701, the high-temperature lubricating oil after use can be cooled, its temperature can be reduced, and it can be restored to the operating temperature and recycled again.

[0049] In another embodiment provided by the present invention: A circulation pump 9 is installed on one side of the bottom of the body top cover 2. The discharge end of the oil discharge pipe 805 is connected to the inlet end of the heat exchange plate 7 through the circulation pump 9. The discharge end of the heat exchange plate 7 is provided with a supply pipe 901, and the supply pipe 901 is connected to the oil inlet end of the cooling oil tank 902. A diversion pipe 907 connected to the oil inlet end of the compression main unit 4 is arranged on the surface of the supply pipe 901. The lubricating oil cooled by the cooperation of the heat exchange plate 7 and the cooling fan 701 is input into the cooling oil tank 902 through the supply pipe 901 to cool the bottom of the main motor 3, and then flows back into the lubricating oil cooling system.

[0050] It should be noted that the circulation pump 9 is installed at the bottom of the body top cover 2 to circulate and transport the lubricating oil, introduce the high-temperature lubricating oil into the heat exchange plate 7 for cooling, and at the same time, the lubricating oil discharged after cooling is discharged under the action of the circulation pump 9 for recycling.

[0051] In another embodiment provided by the present invention: Flow guide plates 904 are stagger-welded on both sides of the inner wall of the cooling oil tank 902. The discharge end of the cooling oil tank 902 is provided with an output pipe 906 communicated with the oil discharge pipe 805. The flow guide plates 904 are used to limit the intervals inside the cooling cavity 903, so that the lubricating oil entering the cooling oil tank 902 flows according to the preset flow path of the flow guide plates 904, ensuring the cooling effect on the bottom of the main motor 3. Arc-shaped grooves 905 are formed on both sides of the top of the cooling oil tank 902. Through the arc-shaped groove 905 structure, the cooling oil tank 902 can be better fitted to the bottom of the main motor 3 during welding, realizing a perfect fit with the bottom of the main motor 3 and ensuring the sealing performance of the connection.

[0052] It should be noted that through the deflector 904 located inside the cooling oil tank 902, the flow direction of the lubricating oil inside the cooling oil tank 902 is guided, improving its cooling effect on the bottom of the main motor 3. The radian of the arc-shaped groove 905 is the same as the radian of the bottom of the housing of the main motor 3, so that the cooling oil tank 902 can fit the bottom of the main motor 3 through the arc-shaped groove 905 during installation.

[0053] In another embodiment provided by the present invention, intake end pipes 1004 are evenly installed at equal distances on the surface of the gas inlet pipe 1001 facing the outer periphery of the main motor 3. The intake end pipes 1004 are all connected to the inside of the flow cavity 1003. The air flow located on the outer periphery of the main motor 3 that is drawn in enters the flow cavity 1003 through the intake end pipes 1004 and is discharged along the gas recovery pipe 1002. Installation holes 1005 corresponding to the installation positions of the ends of the main motor 3 are provided on both sides inside the arc-shaped cover 10. The main motor 3 is pre-opened on the side. When the arc-shaped cover 10 fits the side of the end of the main motor 3, fasteners are screwed in between the installation holes 1005 to fix the position of the arc-shaped cover 10. An electric heating wire 11 and a temperature monitoring sensor 1101 are installed inside the air supply pipe 5.

[0054] It should be noted that through the electric heating wire 11, under the working conditions of low-temperature cold start of the unit, the inhaled air can be quickly heated. On the one hand, the temperature of the inhaled air is increased. On the other hand, the just-started lubricating oil is heated by the inhaled air flow, reducing the viscosity of the lubricating oil and enhancing its fluidity.

[0055] During operation, the body bottom plate 1, the body top cover 2 and the side enclosing plates of the unit are combined to form a complete frame structure. Inside this frame structure, the components of the screw air compressor are installed and carried, and the external environment is isolated to ensure the normal operation of each component. Components such as the main motor 3, the compression main unit 4, and the oil barrel 6 are arranged on the top of the body bottom plate 1. Components such as the heat exchange plate 7, the cooling fan 701, and the circulation pump 9 are installed at the bottom end and inside of the body top cover 2. At the top air inlet end of the compression main unit 4, components such as the air inlet pipe 801 and the filter cartridge 8 are provided. During operation, the main motor 3 is energized and operates to drive the screw structure inside the compression main unit 4 to rotate. By using the mutually cooperating twin-screw structure, the processes of air intake, compression, and exhaust are realized. The oil-gas mixture compressed inside the compression main unit 4 will be discharged into the interior of the oil barrel 6. Inside the oil barrel 6, oil-gas separation treatment is carried out by the oil-gas separator 601. The circulation pump 9 conducts the circulation operation of the lubricating oil, extracts the high-temperature oil liquid inside the oil barrel 6, and enters the interior of the heat exchange plate 7 after passing through the heat exchange coil 802. During the operation of the compression main unit 4, the air inlet pipe 801 inhales low-temperature air. At the same time, after the high-temperature lubricating oil enters the interior of the heat exchange coil 802, heat exchange treatment is carried out with the low-temperature air by using the heat dissipation fins 803, so that the temperature of the air to be compressed rises, and the temperature of the lubricating oil decreases. When the lubricating oil with decreased temperature enters the subsequent cooling system for cooling, the energy consumption of the cooling system can be reduced. When the gas heated up through heat exchange treatment enters the interior of the compression main unit 4, the condensed water in the air can be reduced, avoiding the mixing of the condensed water with the lubricating oil inside the compression main unit 4, resulting in the emulsification of the lubricating oil, reducing the lubrication effect, and even causing problems such as corrosion and mechanical failures. By reducing the moisture content, the performance and service life of the lubricating oil are ensured. After heat exchange, the temperature of the air rises and the air density decreases. The work required by the compression main unit 4 during the compression process is reduced, thereby reducing the energy consumption of the main motor 3. At the same time, the preheated air flow can reduce the temperature difference at both ends inside the compression main unit 4, avoiding the problem that the excessive temperature difference fluctuation affects the operation stability of the compression main unit 4. The lubricating oil after heat exchange is discharged into the interior of the heat exchange plate 7 and is cooled under the action of the cooling fan 701 to reduce its temperature. After cooling, a part of the lubricating oil is directly discharged into the oil inlet end of the compression main unit 4, and the other part enters the cooling oil tank 902 arranged at the bottom of the main motor 3 through the supply pipe 901. The interval inside the cooling cavity 903 is restricted by the guide plate 904, so that the lubricating oil entering the interior of the cooling oil tank 902 flows according to the preset flow path of the guide plate 904, ensuring its cooling effect on the bottom of the main motor 3. The bottom of the main motor 3 is cooled by using the low-temperature lubricating oil, and at the same time, by using the heat conductivity of the housing structure of the main motor 3, the overall working temperature of the main motor 3 is reduced, avoiding the problem of increased energy consumption caused by too high temperature and prolonging the service life of the main motor 3. After the lubricating oil that has cooled the main motor 3 flows back to the lubricating oil cooling system for re-cooling treatment. During the operation of the main motor 3 and the compression main unit 4, the arc-shaped retaining cover 10 also plays a role in air intake.Through the gas inlet pipe 1001 and the intake end pipe 1004, the airflow located on the outer peripheral side of the main motor 3 can be sucked into the inside of the intake pipe 801. Through the set auxiliary intake structure, the gas flow at the outer peripheral position of the main motor 3 can be increased, avoiding the problem of regional temperature rise of the peripheral air caused by the long-term operation of the main motor 3, and improving the heat dissipation effect of the main motor 3 to a certain extent. Inside the supply pipe 5, there are an electric heating wire 11 and a temperature monitoring sensor 1101 assembly. The temperature monitoring sensor 1101 is connected to an external controller, and the control end of the electric heating wire 11 is also connected to the controller. Through the external controller, its opening and closing and temperature are controlled. Under the working condition of low-temperature cold start of the unit, the electric heating wire 11 assembly quickly heats the inhaled air. On the one hand, it raises the temperature of the inhaled air. On the other hand, the initially working low-temperature lubricating oil is heated by the inhaled air flow. After the lubricating oil is heated, its viscosity can be reduced and its fluidity can be enhanced, thereby reducing the wear of the mechanical components inside the compression host 4 and extending the service life of the equipment. Through the temperature monitoring sensor 1101, the intake temperature at the intake end of the compression host 4 can be monitored in real time, facilitating timely regulation.

[0056] Only some exemplary embodiments of the present invention have been described by way of illustration. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An energy-saving screw air compressor, comprising: The machine body bottom plate (1) that bears the core components of the screw air compressor and the machine body top cover (2) that cooperates with the machine body side enclosure plate to isolate the unit equipment. The main motor (3) and the compression main unit (4) are respectively installed on the top of the machine body bottom plate (1), and the power output end of the main motor (3) is connected to the power input end of the active screw inside the compression main unit (4). It is characterized in that; At the air inlet end at the top of the compression main unit (4), there is an air supply pipe (5) connected to the end of the screw inside the compression main unit (4) to realize the input of the air source for the compression main unit (4) to compress air. There are various air inlet modes at the air inlet end inside the air supply pipe (5) to realize the pretreatment of the air source to be compressed; At the top of the main motor (3), there is an auxiliary air suction structure and it is connected to the air inlet end of the air supply pipe (5) through the auxiliary air suction structure. The auxiliary air suction structure continuously sucks the air flow on the outer periphery of the main motor (3) to avoid the formation of a range of hot spots on the outer periphery of the main motor (3) due to long-term operation. At the bottom of the main motor (3), there is an auxiliary heat dissipation mechanism. The auxiliary heat dissipation mechanism uses the lubricating oil after cooling to cool the bottom position of the main motor (3), and at the same time uses the heat conductivity of the main motor (3) housing structure to reduce the overall operating temperature of the main motor (3), and at the same time returns the used lubricating oil to the lubricating oil cooling system.

2. The energy-saving screw air compressor according to claim 1, wherein At the air inlet end of the air supply pipe (5), there is a filter cartridge (8) installed with an air inlet filter element. At the air inlet end of the filter cartridge (8), there is an air inlet pipe (801) and a connecting pipe (1006). At the exhaust end of the filter cartridge (8), there is a connecting pipe (501) installed and it is connected to the air inlet end of the air supply pipe (5) through the connecting pipe (501). An air inlet valve (502) is installed at the connection between the air supply pipe (5) and the end of the connecting pipe (501) to realize the regulation of the air inlet system of the air compressor.

3. An energy-saving screw air compressor according to claim 1, characterized in that, The auxiliary air suction structure, through the arc-shaped clamping cover (10) fixed to the side of the end of the main motor (3), installs the gas inlet pipe (1001) to the outer peripheral position at the top of the main motor (3). At the exhaust end of the arc-shaped clamping cover (10), there is a gas recovery pipe (1002) connected to the connecting pipe (1006). A communicating cavity (1003) is opened in the gas recovery pipe (1002), the arc-shaped clamping cover (10) and the gas inlet pipe (1001). Through the communicating cavity (1003) and the gas recovery pipe (1002), the air flow near the outer periphery of the main motor (3) is sucked in and transported to the inside of the filter cartridge (8) for filtering.

4. An energy-saving screw air compressor according to claim 1, wherein, The auxiliary heat dissipation mechanism, a cooling oil tank (902) is welded at the bottom position of the main motor (3), and motor fins (301) are integrally formed on the outer peripheral position of the main motor (3) housing. The motor fins (301) at the bottom of the outer periphery of the main motor (3) are inserted into the inside of the cooling oil tank (902). A cooling cavity (903) for the flow of the lubricating oil after cooling is opened in the cooling oil tank (902). The lubricating oil after cooling enters the inside of the cooling oil tank (902) to cool the bottom of the main motor (3) and then is discharged and returned to the lubricating oil cooling system.

5. An energy-saving screw air compressor according to claim 1, characterized in that, On one side of the top of the body bottom plate (1) in the vertical direction, an oil cylinder (6) is installed. When the compression main machine (4) works, the oil-gas mixture discharged after the internal screw structure is compressed is discharged into the oil cylinder (6). A gas-liquid separator (601) is installed in cooperation with the top of the oil cylinder (6). The oil-gas mixture entering the oil cylinder (6) from the compression main machine (4) is separated by the gas-liquid separator (601) to form pure gas and pure oil.

6. The energy-saving screw air compressor according to claim 5, characterized in that, A heat exchange coil (802) is installed inside the intake pipe (801), and an oil inlet pipe (804) connected to the oil cylinder (6) is provided at the inlet end of the heat exchange coil (802). The high-temperature lubricating oil discharged from the inside of the oil cylinder (6) is discharged into the heat exchange coil (802) through the oil inlet pipe (804). Heat dissipation fins (803) are welded to the outer periphery of the heat exchange coil (802), and the heat exchange effect of the heat exchange coil (802) during operation is improved through the heat dissipation fins (803).

7. An energy-saving screw air compressor according to claim 6, characterized in that, A heat exchange plate (7) is installed on one side of the bottom of the body top cover (2). An oil discharge pipe (805) extending to the outside of the intake pipe (801) is provided at the discharge end of the heat exchange coil (802). The inlet end of the heat exchange plate (7) is connected to the oil discharge pipe (805). The lubricating oil used inside the heat exchange coil (802) is discharged into the heat exchange plate (7) through the oil discharge pipe (805) for cooling. A heat dissipation fan (701) is embedded at the top position of the heat exchange plate (7) inside the body top cover (2). The used high-temperature lubricating oil is cooled through the cooperation of the heat dissipation fan (701) and the heat exchange plate (7).

8. An energy-saving screw air compressor according to claim 7, wherein, A circulation pump (9) is installed on one side of the bottom of the body top cover (2). The discharge end of the oil discharge pipe (805) is connected to the inlet end of the heat exchange plate (7) through the circulation pump (9). A supply pipe (901) is installed at the discharge end of the heat exchange plate (7) and is connected to the oil inlet end of the cooling oil tank (902) through the supply pipe (901). A shunt pipe (907) connected to the oil inlet end of the compression main machine (4) is provided on the surface of the supply pipe (901). The lubricating oil cooled through the cooperation of the heat exchange plate (7) and the heat dissipation fan (701) is input into the cooling oil tank (902) through the supply pipe (901) to cool the bottom of the main motor (3), and then flows back to the lubricating oil cooling system.

9. The energy-saving screw air compressor according to claim 4, characterized in that Flow guide plates (904) are stagger-welded on both sides of the inner wall of the cooling oil tank (902). An output pipe (906) communicating with the oil discharge pipe (805) is installed at the discharge end of the cooling oil tank (902). The internal area of the cooling cavity (903) is restricted through the flow guide plates (904), so that the lubricating oil entering the cooling oil tank (902) flows according to the preset flow path of the flow guide plates (904), ensuring the cooling effect on the bottom of the main motor (3). Arc-shaped grooves (905) are provided on both sides of the top of the cooling oil tank (902). Through the arc-shaped groove (905) structure, the cooling oil tank (902) can be better attached to the bottom position of the main motor (3) during welding, achieving a perfect fit with the bottom of the main motor (3) and ensuring the sealing performance of the connection.

10. The energy-saving screw air compressor according to claim 5, characterized in that, Some intake end pipes (1004) are evenly and equidistantly installed on the surface of the gas inlet pipe (1001) facing the outer periphery of the main motor (3). The intake end pipes (1004) are all connected to the inside of the flow cavity (1003). The air flow located on the outer periphery of the main motor (3) that is drawn in enters the inside of the flow cavity (1003) through the intake end pipes (1004) and is discharged along the gas recovery pipe (1002). Installation holes (1005) corresponding to the installation positions of the ends of the main motor (3) are provided on both sides inside the arc-shaped cover (10). The side of the main motor (3) is pre-opened with holes. When the arc-shaped cover (10) fits the side of the end of the main motor (3), fasteners are screwed in between the installation holes (1005) to fix the position of the arc-shaped cover (10). An electric heating wire (11) and a temperature monitoring sensor (1101) are installed inside the air supply pipe (5).

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