Oil-free screw air compressor

Abstract

The invention is suitable for the technical field of air compressors, and provides an oil-free screw air compressor which comprises a base and an oil-free screw air compressor body, the oil-free screw air compressor body is installed on the base through screws, and an interlayer cooling cavity is formed in a machine shell of the oil-free screw air compressor body and used for injecting cooling liquid to cool the oil-free screw air compressor body; the supporting frame is fixed to the top of the base and used for installing the liquid conveying mechanism, and the liquid conveying mechanism is fixed to the top of the supporting frame and used for conveying cooling liquid to the interlayer cooling cavity of the machine shell. Compared with a traditional mode that the screw is directly cooled through cold water, the oil-free screw air compressor provided by the scheme has the advantages that compressed air does not make contact with cooling liquid, follow-up gas-liquid separation is not needed, complex gas-liquid separation equipment is not needed, the complexity during operation of the air compressor is greatly reduced, the manufacturing cost of the equipment is also reduced, and the oil-free screw air compressor is suitable for popularization and application. The probability of equipment failure is reduced, and the reliability of equipment operation is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of air compressors, and particularly relates to an oil-free screw air compressor. Background Art

[0002] In the existing oil-free screw air compressor technology, since there is no oil to cool the screw of the compressed air, the cleanliness of the compressed air is greatly increased. In the existing technology, generally, the screw of the compressed air is directly cooled by a water-cooling method, and then gas-liquid separation is carried out. This method has some drawbacks. Among them, the gas-liquid separation process is complex, which not only increases the manufacturing cost of the equipment, but also has a higher probability of failure of the complex gas-liquid separation equipment during operation and requires more maintenance work. Summary of the Invention

[0003] To solve the technical problems of complex gas-liquid separation process and high equipment cost in the direct water-cooling of the oil-free screw air compressor in the prior art, the present invention provides an oil-free screw air compressor.

[0004] The present invention is realized as follows. An oil-free screw air compressor includes: a base and an oil-free screw air compressor body. The oil-free screw air compressor body is installed on the base by screws. The casing of the oil-free screw air compressor body is provided with an interlayer cooling cavity for injecting a coolant to cool the oil-free screw air compressor body; a support frame fixed on the top of the base for installing an infusion mechanism. The infusion mechanism is fixed on the top of the support frame and is used for conveying the coolant to the interlayer cooling cavity of the casing.

[0005] Preferably, the oil-free screw air compressor body further includes a female screw and a male screw assembled in the inner chamber of the casing. The female screw and the male screw are meshed to compress air when rotating. Both ends of the female screw and the male screw are provided with integrally formed central shafts. Two meshed spur gears are fixedly sleeved on the two central shafts at the same end of the female screw and the male screw.

[0006] Preferably, the front end of the casing is open and is provided with a front end cover. The central shafts at both ends of the female screw and the male screw are respectively rotatably connected to the casing and the front end cover through sealed bearings. A rear end cover and a front end cover are respectively installed at the rear end of the casing and the front end of the front end cover. A gear chamber for accommodating two spur gears is formed between the rear end cover and the casing.

[0007] Preferably, a cooling tank for storing the coolant is fixedly installed on the support frame. The top opening of the cooling tank is provided with a top cover. A liquid adding hopper is arranged on the top cover. A hopper cover provided with a vent hole is threadedly installed on the liquid adding hopper.

[0008] Preferably, a motor is fixedly installed on the base. The output shaft of the motor is connected to one end of any central shaft through a coupling for providing power for the operation of the oil-free screw air compressor body.

[0009] Preferably, a plurality of partition plates for increasing the strength of the casing are installed in the interlayer cooling cavity of the casing, and the interlayer cooling cavity is partitioned into a plurality of sub-chambers. A plurality of communication holes for communicating adjacent sub-chambers are formed in the partition plates.

[0010] Preferably, the liquid infusion mechanism includes: a pump casing fixedly installed on the top of the support frame, an impeller is assembled in the pump casing; a first round shaft rotatably installed in the pump casing through a sealed bearing, the impeller is fixedly sleeved on the first round shaft, and one end of the first round shaft extends outside the pump casing; a liquid inlet pipe connected to the liquid inlet of the pump casing, and one end of the liquid inlet pipe extends into the cooling tank; a liquid outlet pipe fixedly installed on the liquid outlet of the pump casing, and one end of the liquid outlet pipe is connected with a liquid inlet cross pipe; wherein, a plurality of branch pipes respectively communicating with each sub-chamber are installed at the bottom and top of the casing, and a plurality of branch pipes at the bottom of the casing are all connected and communicated with the liquid inlet cross pipe; a liquid return cross pipe installed at the top ends of a plurality of branch pipes on the top of the casing, one end of the liquid return cross pipe is connected with a spraying pipe, and diversion holes are formed at the bottom of a section of the spraying pipe extending into the cooling tank.

[0011] Preferably, heat dissipation fins are installed on the liquid return cross pipe for dissipating heat from the heated coolant in the liquid return cross pipe during the return process.

[0012] Preferably, two fixed heat dissipation components for cooling the coolant flowing back into the cooling tank after heating are installed on the top cover. The fixed heat dissipation component includes a mounting plate fixed on the top cover. Lower fins and upper fins are respectively arranged at the top and bottom of the mounting plate. The lower fins extend into the coolant in the cooling tank, conduct heat and absorb heat from the heated coolant flowing back, and conduct the heat to the upper fins to transfer the heat to the external environment.

[0013] Preferably, an air cooling mechanism is further installed on the support frame for blowing air on the upper fins to accelerate heat dissipation. The air cooling mechanism includes: a fan casing fixedly installed on the top of the support frame, an air inlet is arranged at one end of the fan casing, and a second round shaft is rotatably installed in the fan casing through a sealed bearing; a wind wheel fixedly sleeved on the second round shaft; an air outlet pipe fixedly installed on the air outlet of the fan casing; a wind dispersing plate fixedly installed on the top cover and located between the two fixed heat dissipation components. The wind dispersing plate is provided with an inner cavity and a communication port connected to the air outlet pipe, and a plurality of air outlet holes are formed on both sides of the wind dispersing plate for blowing air towards the upper fins on the two mounting plates.

[0014] Preferably, a transmission assembly for providing driving force for the infusion mechanism and the air cooling mechanism by using the power of the motor is further installed on the support frame. The transmission assembly includes: a fixed block fixedly installed between two support legs of the support frame, and a horizontally arranged mounting shaft is rotatably installed on the fixed block through a bearing; a transmission rubber roller fixedly sleeved on the mounting shaft and a driving rubber roller fixedly sleeved on the output shaft of the motor, and the transmission rubber roller is in close contact with the driving rubber roller; a connecting shaft fixedly connected to the first wheel shaft and the second wheel shaft respectively through two couplings; two belt pulleys fixedly sleeved on the connecting shaft and the mounting shaft, and the two belt pulleys are driven by a belt.

[0015] Preferably, heat dissipation fins are arranged on the machine shell for dissipating the heat generated when the male screw and the female screw compress air to the external environment.

[0016] Compared with the related art, the oil-free screw air compressor provided by the present invention has the following beneficial effects:

[0017] In the oil-free screw air compressor body of the present invention, a sandwich cooling cavity is provided on the machine shell, and a coolant is injected into the sandwich cooling cavity through the infusion mechanism to cool the oil-free screw air compressor body. Compared with the traditional method of directly cooling the screw with cold water, the compressed air does not contact the coolant, so there is no need for subsequent gas-liquid separation, and no complex gas-liquid separation equipment is required. This greatly reduces the complexity of the air compressor during operation, also reduces the manufacturing cost of the equipment, reduces the probability of equipment failure, and improves the reliability of equipment operation;

[0018] At the same time, the fixed heat dissipation assembly on the top of the cooling box can cool the coolant that rises and flows back into the cooling box, and the air cooling mechanism can blow air on the upper fins to accelerate heat dissipation. These heat dissipation measures cooperate with each other to improve the overall heat dissipation performance of the oil-free screw air compressor from multiple aspects, which helps to extend the service life of the equipment;

[0019] The transmission assembly installed on the support frame can use the power of the motor to provide driving force for the infusion mechanism and the air cooling mechanism. This design realizes the efficient utilization of power, eliminates the need to set up separate power sources for the infusion mechanism and the air cooling mechanism, further simplifies the equipment structure, and reduces the energy consumption and cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic side view structure diagram of an oil-free screw air compressor provided by the present invention;

[0021] Figure 2 It is a schematic side sectional view structure diagram of an oil-free screw air compressor provided by the present invention;

[0022] Figure 3 is Figure 2Schematic enlarged structure diagram of part A shown therein;

[0023] Figure 4 is Figure 2 Schematic enlarged structure diagram of part B shown therein;

[0024] Figure 5 is Figure 2 Schematic enlarged structure diagram of part C shown therein;

[0025] Figure 6 is Figure 2 Schematic enlarged structure diagram of part D shown therein;

[0026] Figure 7 is Figure 2 Schematic enlarged structure diagram of part E shown therein;

[0027] Figure 8 Front view structure diagram of the oil-free screw air compressor body in the present invention;

[0028] Figure 9 Top view structure diagram of the top cover in the present invention;

[0029] Figure 10 3D structure diagram of the heat dissipation plate in the present invention;

[0030] Figure 11 3D structure diagram of the mounting plate, upper fins and lower fins in the present invention;

[0031] Figure 12 3D structure diagram of the base in the present invention;

[0032] Figure 13 Front view structure diagram of the fixing block, mounting shaft and support frame in the present invention.

[0033] Reference numerals: 1. Base; 2. Housing; 3. Female screw; 4. Male screw; 5. Central shaft; 6. Straight gear; 7. Motor; 8. Partition plate; 9. Interlayer cooling cavity; 10. Support frame; 11. Cooling box; 12. Top cover; 13. Liquid filling hopper; 14. Pump housing; 15. Impeller; 16. First round shaft; 17. Liquid inlet pipe; 18. Liquid outlet pipe; 19. Liquid inlet cross pipe; 20. Branch pipe; 21. Liquid return cross pipe; 22. Spray pipe; 23. Heat dissipation fins; 24. Mounting plate; 25. Lower fins; 26. Upper fins; 27. Fan housing; 28. Second round shaft; 29. Wind wheel; 30. Air outlet pipe; 31. Air diffusing plate; 32. Air outlet holes; 33. Fixing block; 34. Mounting shaft; 35. Driving rubber roller; 36. Driving rubber roller; 37. Connecting shaft; 38. Pulley; 39. Belt; 201. Inner chamber of the shell; 202. Gear chamber; 203. Rear cover; 204. Front end cover; 205. Front cover; 206. Heat dissipation fins. Detailed implementation manners

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and the above drawings of this application are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and the above drawings of this application are used to distinguish different objects and not to describe a specific order.

[0035] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0036] An embodiment of the present invention provides an oil-free screw air compressor, as Figures 1-13 shown, the oil-free screw air compressor includes: a base 1 and an oil-free screw air compressor body. The oil-free screw air compressor body is installed on the base 1 by screws. The casing 2 of the oil-free screw air compressor body is provided with an interlayer cooling cavity 9 for injecting coolant to cool the oil-free screw air compressor body; a support frame 10 fixed on the top of the base 1 for installing an infusion mechanism. The infusion mechanism is fixed on the top of the support frame 10 and is used to convey coolant to the interlayer cooling cavity 9 of the casing 2.

[0037] In this embodiment, the base 1 provides a stable support foundation for the entire oil-free screw air compressor. The oil-free screw air compressor body is the core component, and the interlayer cooling cavity 9 of the casing 2 plays an important cooling function. By injecting coolant, the oil-free screw air compressor body is cooled. The support frame 10 is used to install the infusion mechanism, and the infusion mechanism can accurately convey the coolant to the interlayer cooling cavity 9 to ensure the continuous progress of the cooling process. This structural design brings many beneficial effects. First, the design of the interlayer cooling cavity 9 makes the cooling more uniform, avoiding local overheating and helping to improve the overall working stability of the oil-free screw air compressor. Second, compared with traditional oil-free screw air compressors, this integrated cooling structure does not allow compressed air to come into contact with the coolant, eliminating the need for subsequent gas-liquid separation and complex gas-liquid separation equipment. This greatly reduces the complexity of the air compressor during operation, as well as the manufacturing cost of the equipment, reduces the probability of equipment failure, and improves the reliability of equipment operation.

[0038] In a further preferred embodiment of the present invention, the oil-free screw air compressor body further includes a female screw 3 and a male screw 4 assembled in the inner chamber 201 of the housing 2. The female screw 3 and the male screw 4 are meshed with each other for compressing air when rotating. Both ends of the female screw 3 and the male screw 4 are provided with integrally formed central shafts 5. On the two central shafts 5 at the same end of the female screw 3 and the male screw 4, two meshed spur gears 6 are fixedly sleeved.

[0039] In this embodiment, the housing 2 provides a receiving space, i.e., the inner chamber 201, for the female screw 3 and the male screw 4. The female screw 3 and the male screw 4 rotate by meshing with each other to achieve the function of compressing air. The integrally formed central shafts 5 at both ends of the female screw 3 and the male screw 4 provide a basis for their rotation and power transmission. The two meshed spur gears 6 fixedly sleeved on the two central shafts 5 at the same end of the female screw 3 and the male screw 4 play a role in transmission and coordinated operation. When power is transmitted to one of the central shafts 5, the other central shaft 5 is driven to rotate through the meshing of the spur gears 6, thereby ensuring the synchronous and stable rotation of the female screw 3 and the male screw 4 for air compression work.

[0040] The meshing structure of the female screw 3 and the male screw 4 makes the process of compressing air efficient and stable, ensuring the normal operation of the air compressor. The setting of the spur gears 6 ensures the synchronism of the rotation of the female screw 3 and the male screw 4, reduces the vibration and noise caused by non-synchronization, improves the smoothness of the equipment operation, and also helps to maintain the stability of the air compression process.

[0041] In a further preferred embodiment of the present invention, the front end of the housing 2 is open and is installed with a front end cover 204. The central shafts 5 at both ends of the female screw 3 and the male screw 4 are respectively rotationally connected to the housing 2 and the front end cover 204 through sealed bearings. A rear end cover 203 and a front end cover 205 are respectively installed at the rear end of the housing 2 and the front end of the front end cover 204. A gear chamber 202 for accommodating the two spur gears 6 is formed between the rear end cover 203 and the housing 2.

[0042] In this embodiment, the front end of the housing 2 is open and installed with a front end cover 204. The central shafts 5 at both ends of the female screw 3 and the male screw 4 are rotationally connected to the housing 2 and the front end cover 204 through sealed bearings. This sealed bearing connection method not only ensures the smooth rotation of the central shaft 5 but also prevents air or coolant leakage. The rear end cover 203 at the rear end of the housing 2 and the front end cover 205 at the front end of the front end cover 204 play a sealing role. The gear chamber 202 formed between the rear end cover 203 and the housing 2 is used to accommodate the two spur gears 6, providing a stable working space for the spur gears 6.

[0043] The use of the sealed bearing ensures the sealing of the equipment, maintains a stable working environment inside the equipment, and helps improve the working efficiency of the oil-free screw air compressor and the quality of the compressed air. The settings of the rear cover 203 and the front cover 205 enhance the overall enclosure of the equipment, reduce the interference of external factors on the internal components, and reduce the possibility of failures. The presence of the gear chamber 202 enables the spur gear 6 to work in a suitable space, ensuring the accuracy and stability of the transmission between the female screw 3 and the male screw 4, thereby improving the reliability and stability of the operation of the entire oil-free screw air compressor and reducing the vibration and noise during equipment operation. An oil injection hole (not marked in the figure) is also provided on the outer wall of the gear chamber 202 for injecting lubricating oil, and a sealing cover is installed.

[0044] In a further preferred embodiment of the present invention, a cooling tank 11 for storing coolant is fixedly installed on the support frame 10. A top cover 12 is installed at the top opening of the cooling tank 11. A liquid addition hopper 13 is provided on the top cover 12, and a hopper cover provided with a vent hole is threadedly installed on the liquid addition hopper 13.

[0045] In this embodiment, the setting of the cooling tank 11 ensures a stable storage space for the coolant, guaranteeing the continuous cooling of the oil-free screw air compressor. The designs of the top cover 12 and the liquid addition hopper 13 make it convenient and quick to add coolant, and the coolant can be replenished without complex operations. The designs of the hopper cover and the vent hole not only protect the coolant from external contamination but also ensure that the air pressure in the upper part of the coolant in the cooling tank 11 will not be too high due to temperature rise, improving the convenience of maintaining the entire oil-free screw air compressor and reducing the possibility of equipment failures caused by coolant problems, which helps the stable operation of the equipment.

[0046] In a further preferred embodiment of the present invention, a motor 7 is fixedly installed on the base 1, and its output shaft is connected to one end of any one of the middle shafts 5 through a coupling, for providing power for the operation of the oil-free screw air compressor body.

[0047] In this embodiment, the motor 7 is installed on the base 1 with a stable structure, providing a reliable power source for the operation of the entire device. The connection method between the motor 7 and the middle shaft 5 is simple and direct, which can effectively transmit power to the female screw 3 and the male screw 4, ensuring the normal operation of the oil-free screw air compressor, improving the operation efficiency of the equipment, reducing the possible failures caused by unstable power transmission, and ensuring the stability and reliability of the equipment operation.

[0048] In a further preferred embodiment of the present invention, a plurality of partition plates 8 for increasing the strength of the housing 2 are installed in the sandwich cooling cavity 9 of the housing 2, and the sandwich cooling cavity 9 is divided into a plurality of sub-chambers. A plurality of communication holes for communicating adjacent sub-chambers are provided on the partition plate 2.

[0049] In this embodiment, the partition plate 8 is provided to increase the strength of the housing 2, making the housing 2 less likely to be damaged during the operation of the device, and improving the overall structural stability of the device. The design of multiple sub-chambers and communication holes makes the flow path of the coolant in the sandwich cooling chamber 9 more complex, which helps the coolant to be more evenly distributed in the chamber, thereby improving the cooling effect, ensuring that the temperature of the oil-free screw air compressor remains within a suitable range during operation, reducing the possibility of failures caused by local overheating, and further improving the reliability and service life of the device.

[0050] In a further preferred embodiment of the present invention, the liquid delivery mechanism includes: a pump housing 14 fixedly installed on the top of the support frame 10, an impeller 15 is assembled in the pump housing 14; a first round shaft 16 rotatably installed in the pump housing 14 through a sealed bearing, the impeller 15 is fixedly sleeved on the first round shaft 16, and one end of the first round shaft 16 extends outside the pump housing 14; a liquid inlet pipe 17 connected to the liquid inlet of the pump housing 14, and one end of the liquid inlet pipe 17 extends into the cooling tank 11; a liquid outlet pipe 18 fixedly installed on the liquid outlet of the pump housing 14, and one end of the liquid outlet pipe 18 is connected to a liquid inlet cross pipe 19; wherein, a plurality of branch pipes 20 respectively communicating with each sub-chamber are installed at the bottom and top of the housing 2, and a plurality of branch pipes 20 at the bottom of the housing 2 are all connected to and communicate with the liquid inlet cross pipe 19; a liquid return cross pipe 21 at the top ends of a plurality of branch pipes 20 installed on the top of the housing 2, one end of the liquid return cross pipe 21 is connected to a spray pipe 22, and diversion holes are opened at the bottom of a section of the spray pipe 22 extending into the cooling tank 11.

[0051] In this embodiment, the liquid delivery mechanism can realize the circulation of the coolant. The rotation of the impeller 15 in the pump housing 14 can suck the coolant in the cooling tank 11 through the liquid inlet pipe 17 and transport it to the sub-chambers of the sandwich cooling chamber 9 of the housing 2 through the liquid outlet pipe 18, the liquid inlet cross pipe 19, and the branch pipes 20. The cooled coolant returns to the cooling tank 11 through the top branch pipes 20, the liquid return cross pipe 21, the spray pipe 22, and the diversion holes. The sealed bearing ensures smooth rotation and good sealing of the first round shaft 16. The connection of a plurality of branch pipes 20 to the sub-chambers ensures that the coolant is widely and evenly distributed in the sandwich cooling chamber 9, improves the cooling efficiency, ensures the stable operation of the oil-free screw air compressor, reduces the overheating risk, and at the same time, the recycling of the coolant also improves the resource utilization rate.

[0052] In a further preferred embodiment of the present invention, heat dissipation fins 23 are installed on the liquid return cross pipe 21 for dissipating heat and cooling the heated coolant in the liquid return cross pipe 21 during the return process.

[0053] In this embodiment, the heat dissipation fins 23 installed on the liquid return horizontal pipe 21 can effectively reduce the temperature of the reflux coolant. During the operation of the oil-free screw air compressor, after the coolant absorbs heat and rises in temperature, when it refluxes through the liquid return horizontal pipe 21, the heat dissipation fins 23 accelerate the heat dissipation speed of the coolant by increasing the heat dissipation area, so that the temperature of the coolant decreases when it returns to the cooling tank 11. This can improve the cooling efficiency of the coolant, ensure that the coolant can continuously and effectively cool the oil-free screw air compressor, reduce the possibility of equipment failure due to too high coolant temperature, and help maintain the stable operation of the equipment.

[0054] In a further preferred embodiment of the present invention, two fixed heat dissipation components for cooling the coolant that rises in temperature and refluxes into the cooling tank 11 are installed on the top cover 12. The fixed heat dissipation component includes a mounting plate 24 fixed on the top cover 12. Lower fins 25 and upper fins 26 are respectively arranged at the top and bottom of the mounting plate 24. The lower fins 25 extend into the coolant in the cooling tank 11 to conduct heat and absorb heat from the rising and refluxing coolant, and conduct the heat to the upper fins 26 to transfer the heat to the external environment.

[0055] In this embodiment, the fixed heat dissipation component can effectively reduce the temperature of the reflux coolant in the cooling tank 11. The lower fins 25 penetrate into the coolant to directly absorb heat, and then transfer the heat to the upper fins 26 to be dissipated to the external environment. In this way, the coolant can be cooled faster, so that it can be more efficiently put into the cooling work of the oil-free screw air compressor again, which helps maintain the normal operating temperature of the equipment, reduces the risk of equipment failure caused by too high coolant temperature, and ensures the stable operation of the equipment.

[0056] In another embodiment of the present invention, an air cooling mechanism is further installed on the support frame 10 for blowing air on the upper fins 26 to accelerate heat dissipation. The air cooling mechanism includes: a fan housing 27 fixedly installed on the top of the support frame 10. One end of the fan housing 27 is provided with an air inlet, and a second round shaft 28 is rotatably installed in the fan housing 27 through a sealed bearing; a wind wheel 29 fixedly sleeved on the second round shaft 28; an air outlet pipe 30 fixedly installed on the air outlet of the fan housing 27; a wind dispersing plate 31 fixedly installed on the top cover 12 and located between the two fixed heat dissipation components. The wind dispersing plate 31 is provided with an inner cavity and is provided with a communication port connected to the air outlet pipe 30, and a plurality of air outlet holes 32 are opened on both sides of the wind dispersing plate 31 for blowing air towards the upper fins 26 on the two mounting plates 24.

[0057] In this embodiment, the air-cooling mechanism installed on the support frame 10 blows air on the upper fins 26 of the fixed heat dissipation component to accelerate heat dissipation, which can significantly improve the heat dissipation efficiency. The air wheel 29 rotates in the fan housing 27. After the outside air enters the fan housing 27 from the air inlet, it enters the inner cavity through the communication ports of the air outlet pipe 30 and the air-diffusing plate 31, and then blows out from the air outlet holes 32, directly blowing on the upper fins 26. This accelerates the heat exchange between the upper fins 26 and the external environment. Combining with the heat conduction and heat absorption of the lower fins 25 for the coolant, the coolant can be cooled faster in the cooling tank 11, thereby improving the cooling effect of the entire cooling system, ensuring the stable operation of the oil-free screw air compressor at an appropriate temperature, and reducing the possibility of failures caused by overheating.

[0058] In another embodiment of the present invention, a transmission component for providing driving forces for the liquid infusion mechanism and the air-cooling mechanism by using the power of the motor 7 is further installed on the support frame 10. The transmission component includes: a fixed block 33 fixedly installed between the two support legs of the support frame 10, and a horizontally arranged mounting shaft 34 is rotatably installed on the fixed block 33 through a bearing; a transmission rubber roller 35 fixedly sleeved on the mounting shaft 34 and a driving rubber roller 36 fixedly sleeved on the output shaft of the motor 7, and the transmission rubber roller 35 is in close contact with the driving rubber roller 36; a connecting shaft 37 fixedly connected to the first wheel shaft 16 and the second wheel shaft 28 respectively through two couplings; two belt pulleys 38 fixedly sleeved on the connecting shaft 37 and the mounting shaft 34, and the two belt pulleys 38 are driven by a belt 39.

[0059] In this embodiment, the transmission component on the support frame 10 uses the power of the motor 7 to provide driving forces for the liquid infusion mechanism and the air-cooling mechanism, realizing the effective transmission of power. After the motor 7 is started, the driving rubber roller 36 rotates, drives the transmission rubber roller 35 to rotate through the close contact with the transmission rubber roller 35, and then drives the belt pulley 38 on the mounting shaft 34 to rotate, and then drives the belt pulley 38 on the connecting shaft 37 to rotate through the belt 39, so that the first wheel shaft 16 and the second wheel shaft 28 rotate. In this way, while using one motor 7 to provide power for the oil-free screw air compressor body, it can provide power for the rotation of the impeller 15 of the liquid infusion mechanism and the rotation of the air wheel 29 of the air-cooling mechanism, reducing the number of power sources required for the equipment, lowering the cost, simplifying the equipment structure, and improving the overall operation efficiency and reliability of the equipment.

[0060] In a further preferred embodiment of the present invention, heat dissipation fins 206 are provided on the machine shell 2 for dissipating the heat generated when the male screw 3 and the female screw 4 compress air to the external environment.

[0061] In this embodiment, the heat dissipation fins 206 on the casing 2 dissipate the heat generated when the female screw 3 and the male screw 4 compress air to the external environment, effectively improving the heat dissipation effect. Heat is generated during the process of the female screw 3 and the male screw 4 compressing air. The heat dissipation fins 206 increase the contact area between the casing 2 and the external environment, enabling the heat to be dissipated to the external environment more quickly, thereby preventing the heat from accumulating inside the device and causing the device temperature to be too high, helping to maintain the normal operating temperature of the device, ensuring that the female screw 3 and the male screw 4 can continuously and stably compress air, reducing the risk of device failures caused by overheating, and extending the service life of the device.

[0062] It should be noted that those related to circuits, electronic components, and modules in the present invention are all prior arts, which can be fully realized by those skilled in the art without further elaboration. The content protected by the present invention does not involve improvements to software and methods either.

[0063] An electric control cabinet is also provided in this solution. The electric control cabinet is arranged on the device. When in use, each electrical device can be started to operate separately through the electric control cabinet. The power connection method of each electrical device is a mature prior art and is well-known to those skilled in the art, so no redundant description will be given here.

[0064] In summary, compared with the related art, the oil-free screw air compressor of the present invention has an interlayer cooling cavity 9 provided in the casing of the oil-free screw air compressor body, and the oil-free screw air compressor body is cooled by injecting coolant into the interlayer cooling cavity 9. This cooling method is more uniform than the traditional method of directly cooling the screw with cold water. Because the interlayer cooling cavity 9 can surround the key components of the oil-free screw air compressor body, such as the female screw and the male screw, etc., enabling the heat to be more comprehensively absorbed and carried away by the coolant, avoiding local overheating, and thus improving the working stability of the oil-free screw air compressor.

[0065] The multiple partition plates in the interlayer cooling cavity 9 divide it into multiple sub-chambers. This structural design can make the coolant form a specific flow path in the chamber, increasing the contact time and area between the coolant and the chamber wall, and further improving the cooling effect.

[0066] Since the present invention adopts the cooling method of the interlayer cooling cavity 9, there is no need for the complex gas-liquid separation equipment after the traditional direct cooling of the screw with cold water. This not only simplifies the overall structure of the oil-free screw air compressor, reduces the number of components of the device, but also reduces the manufacturing cost of the device. At the same time, it reduces the risk of failures caused by the complexity of the gas-liquid separation equipment and improves the reliability of the device operation.

[0067] The liquid infusion mechanism can transport the coolant in the cooling box to each sub-chamber of the sandwich cooling chamber 9, realizing the recycling of the coolant. During the liquid return process, heat dissipation fins are installed on the liquid return horizontal pipe, which can dissipate heat from the heated coolant during the return process, improving the cooling efficiency of the coolant, so that the coolant can continuously and effectively cool the oil-free screw air compressor body.

[0068] In addition to the cooling effect of the sandwich cooling chamber 9, heat dissipation fins are also provided on the housing, which can dissipate the heat generated when the male screw and the female screw compress air to the external environment. At the same time, the fixed heat dissipation component at the top of the cooling box can cool the coolant that has returned to the cooling box after heating up, and the air cooling mechanism can blow air on the upper fins to accelerate heat dissipation. These heat dissipation measures cooperate with each other to improve the overall heat dissipation performance of the oil-free screw air compressor from multiple aspects, which helps to extend the service life of the equipment.

[0069] The transmission component installed on the support frame can use the power of the motor to provide driving force for the liquid infusion mechanism and the air cooling mechanism. This design realizes the efficient utilization of power, eliminates the need to separately set power sources for the liquid infusion mechanism and the air cooling mechanism, further simplifies the equipment structure, and reduces the energy consumption and cost of the equipment.

[0070] In several embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still, without conflict, make combinations, additions, deletions, or other adjustments to the features in the embodiments of the present invention according to the situation without creative efforts, so as to obtain different technical solutions that essentially do not deviate from the concept of the present invention, and these technical solutions also fall within the scope of protection of the present invention.

Claims

1. An oil-free screw air compressor, characterized in that: include: The base and the oil-free screw air compressor body are installed on the base by screws. The casing of the oil-free screw air compressor body is provided with a sandwich cooling cavity for injecting coolant to cool the oil-free screw air compressor body. A support frame fixed on the top of the base is used to install an infusion mechanism, and the infusion mechanism is fixed on the top of the support frame and is used to transport cooling liquid to the interlayer cooling cavity of the casing.

2. The oil-free screw air compressor according to claim 1, characterized in that: The oil-free screw air compressor body also includes a female screw and a male screw assembled in the inner chamber of the casing. The female screw and the male screw are meshed with each other to compress air when rotated. Both ends of the female screw and the male screw are provided with an integrally formed central axis. Two meshing spur gears are fixedly sleeved on the two central axes at the same end of the female screw and the male screw.

3. The oil-free screw air compressor according to claim 2, characterized in that: The front end of the casing is open and is equipped with a front end cover. The central axes at both ends of the female screw and the male screw are rotatably connected to the casing and the front end cover respectively through sealed bearings. The rear end of the casing and the front end of the front end cover are respectively equipped with a rear cover and a front cover. A gear chamber for accommodating two spur gears is formed between the rear cover and the casing.

4. The oil-free screw air compressor according to claim 3, characterized in that: A cooling box for storing coolant is fixedly mounted on the support frame, a top cover is mounted on the top opening of the cooling box, a liquid adding hopper is arranged on the top cover, and a hopper cover with air vents is threadedly mounted on the liquid adding hopper.

5. The oil-free screw air compressor according to claim 4, characterized in that: A motor is fixedly mounted on the base, and an output shaft of the motor is connected to one end of any central shaft through a coupling, so as to provide power for the operation of the oil-free screw air compressor body.

6. The oil-free screw air compressor according to claim 5, characterized in that: A plurality of partition plates for increasing the strength of the casing are installed in the interlayer cooling cavity of the casing, and the interlayer cooling cavity is divided into a plurality of sub-chambers. A plurality of connecting holes for connecting adjacent sub-chambers are opened on the partition plates.

7. The oil-free screw air compressor according to claim 6, characterized in that: The infusion mechanism comprises: A pump casing fixedly mounted on the top of the support frame, wherein an impeller is mounted in the pump casing; A first wheel shaft rotatably mounted in the pump housing through a sealed bearing, the impeller is fixedly sleeved on the first wheel shaft, and one end of the first wheel shaft extends outside the pump housing; A liquid inlet pipe connected to the liquid inlet of the pump housing, one end of the liquid inlet pipe extending into the cooling box; A liquid outlet pipe fixedly mounted on the liquid outlet of the pump housing, one end of the liquid outlet pipe being connected to a liquid inlet transverse pipe; Wherein, the bottom and top of the housing are both equipped with a plurality of branch pipes respectively connected to the respective sub-chambers, and the plurality of branch pipes at the bottom of the housing are all connected and connected to the liquid inlet transverse pipe; A liquid return transverse pipe is installed at the top of a plurality of branch pipes on the top of the casing. One end of the liquid return transverse pipe is connected to a spray pipe. The bottom of a section of the spray pipe extending to the cooling box is provided with a diversion hole.

8. The oil-free screw air compressor according to claim 7, characterized in that: The liquid return transverse pipe is provided with heat dissipation fins for dissipating heat and cooling the cooling liquid heated in the liquid return transverse pipe during the reflux process.

9. The oil-free screw air compressor according to claim 4, characterized in that: Two fixed heat dissipation components are installed on the top cover for cooling the coolant that has heated up and refluxed into the cooling box. The fixed heat dissipation components include a mounting plate fixed on the top cover, and the top and bottom of the mounting plate are respectively provided with lower fins and upper fins. The lower fins extend into the coolant in the cooling box, conduct heat and absorb heat from the heated and refluxed coolant, and conduct the heat to the upper fins to transfer the heat to the external environment.

10. The oil-free screw air compressor according to claim 2, characterized in that: The housing is provided with heat dissipation fins for dissipating the heat generated by the female screw and the male screw when compressing air to the external environment.

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