Air-suspending oil-free centrifugal direct-driven air compressor

Abstract

The invention is used for the technical field of air compressors, and discloses an air-suspending oil-free centrifugal direct-drive air compressor which comprises a mounting base, an air compressor shell is fixedly arranged at the upper end of the mounting base, an air inlet pipe is fixedly arranged at one end of the air compressor shell, a direct-drive motor is mounted in one end of the mounting base, and an air outlet pipe is fixedly arranged at the other end of the mounting base. A backflow mechanism is arranged on the outer surface of the air compressor shell, and dust and heat in the air compressor can be taken away in the circulation process of the air by directionally guiding output air, so that the air compressor can work in a better environment. According to the air-suspending oil-free centrifugal direct-driven air compressor, the backflow mechanism is arranged, dust and heat in the air compressor can be effectively taken away in the circulation process of the air by directionally guiding the output air, the working environment of the air compressor is greatly improved, faults caused by high temperature and dust are reduced, and the service life of the air compressor is prolonged. Therefore, the service life of the equipment is obviously prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of air compressors, and in particular to an air-suspended oil-free centrifugal direct-drive air compressor. Background Art

[0002] In the modern industrial production system, air compressors, as indispensable key air source equipment, are widely used in many industries such as chemical industry, machinery manufacturing, electronics, food, etc. The quality of their performance has a profound impact on production efficiency, product quality and production cost. From the early simple reciprocating air compressors, to the later developing screw air compressors, to the current stage where various new technologies are constantly emerging, the development of air compressors has always revolved around the core goals of how to improve efficiency, reduce energy consumption, enhance stability and reduce maintenance costs. Looking back on the development and application of traditional air compressors, a series of problems that need to be solved in the operation process are exposed. Problem to be solved: Taking ordinary bearing air compressors as an example, due to the direct contact friction between mechanical parts, a large amount of energy will be consumed to overcome this friction resistance when the equipment is running. This not only leads to low energy utilization, making the energy consumption cost of the enterprise high, but also frequent friction will cause rapid wear of key parts such as bearings. In order to ensure the normal operation of the equipment, the worn bearings have to be maintained and replaced regularly. This process not only requires a lot of manpower and material costs, but also leads to a significant increase in equipment downtime, seriously affecting the company's continuous production operations, and further increasing the company's production costs and production risks;

[0003] In addition, the air compressor will inevitably generate a lot of heat during long-term operation. If this heat cannot be dissipated in a timely and effective manner, it will gradually accumulate inside the air compressor, causing the temperature inside the equipment to rise sharply. Excessive temperature will have an adverse effect on the various parts of the air compressor, such as reducing the performance of the lubricating oil, reducing its lubrication effect, and accelerating the wear of mechanical parts; at the same time, it will also affect the normal operation of electronic components, and then affect the overall stability and service life of the equipment. At the same time, the problem of dust accumulation inside the air compressor cannot be ignored. With the continuous compression and circulation of air, impurities and particulate matter carried in the air will gradually settle and accumulate inside the air compressor. These dusts will not only hinder the smooth flow of air and reduce the working efficiency of the equipment, but also may cause mechanical failures to a certain extent, further threatening the normal operation of the equipment;

[0004] It is worth noting that traditional air compressors have obvious defects in the design of air flow guidance. They are often unable to fully and reasonably utilize the energy and characteristics of the output air to effectively clean and dissipate heat inside the equipment. This makes it impossible for the equipment to optimize and maintain the internal environment through its own operating mechanism during operation, further limiting the improvement of air compressor performance and the extension of its service life. Summary of the invention

[0005] The object of the present invention is to provide an air-suspended oil-free centrifugal direct-drive air compressor to solve the problems of difficult maintenance and poor heat dissipation of traditional air compressors mentioned in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an air-suspended oil-free centrifugal direct-drive air compressor, comprising a mounting base, an air compressor housing is fixedly arranged on the upper end of the mounting base, and an air intake pipe is fixedly arranged on one end of the air compressor housing, a direct-drive motor is installed inside one end of the mounting base, and one end of the output shaft of the direct-drive motor is fixedly connected to a main shaft, an air suspension bearing is arranged on the inner surface of the air compressor housing, the main shaft is connected to the air compressor housing through the air suspension bearing, and one end of the main shaft is fixedly connected to an impeller, and the outer surface of the air compressor housing A frequency converter is fixedly installed on the surface, a flow guide is provided inside the side surface of the air compressor housing, and one end of the flow guide passes through the outer surface of the air compressor housing, and one end of the flow guide located outside the air compressor housing is fixedly connected to an exhaust port, a lifting ring is threadedly connected to the outer surface of the air compressor housing, an air inlet is provided at one end of the air inlet pipe, and a reflux mechanism is provided on the outer surface of the air compressor housing, through directional flow guidance of the output air, the air can remove dust and heat in the air compressor during the circulation process, so that the air compressor can work in a better environment;

[0007] The reflux mechanism comprises: a mounting frame, the mounting frame is fixedly arranged on the outer surface of the intake pipe, a rotating adjustment rod is installed on the upper end of the mounting frame, and a sliding sliding sealing plate is installed on the outer surface of the mounting frame, and a clearance hole is opened at the lower end of the sliding sealing plate;

[0008] The reflux mechanism further includes: a branch pipe, the branch pipe penetrates the outer surface of the intake pipe, and a first reflux seat is fixedly provided at the lower end of the branch pipe, a second reflux seat is fixedly installed at one end of the air compressor housing, and a reflux pipe is connected between the second reflux seat and the first reflux seat;

[0009] The reflux mechanism also includes: a first diverter seat, which is fixedly installed on the outer surface of one side of the air compressor casing, and one end of the first diverter seat passes through the inner surface of the air compressor casing, and one end of the diverter pipe is installed on the outer surface of the upper end of the exhaust port, and the other end of the diverter pipe is fixedly connected to the first diverter seat.

[0010] Preferably, a first ball valve is installed in series at one end of the diverter pipe connected to the exhaust port, a second ball valve is fixedly installed on the side surface of one end of the diverter pipe connected to the first diverter seat, and one end of the second ball valve passes through the inner surface of the diverter pipe.

[0011] By adopting the above technical solution, the operator can accurately and flexibly adjust the amount of air diverted from the exhaust port for circulation and the amount of detergent injected according to the actual working conditions, which effectively improves the targetedness and controllability of the air compressor in terms of heat dissipation and internal cleaning.

[0012] Preferably, the air compressor casing, main shaft and impeller are concentrically arranged, the flow guide channel is of spiral design, and one end of the flow guide channel facing the interior of the air compressor casing is arranged opposite to the outer surface of the impeller.

[0013] The adoption of the above technical solution ensures the stability and balance of equipment operation, reduces vibration and wear, and efficiently guides the airflow, greatly improving the air compression efficiency and exhaust efficiency, laying a solid foundation for the efficient operation of the entire air compressor system.

[0014] Preferably, the adjusting rod is rotationally connected to the air inlet pipe, and the adjusting rod is threadedly connected to the sliding sealing plate.

[0015] By adopting the above technical solution, the operator can easily and accurately adjust the position of the sliding sealing plate through a simple rotation operation, thereby efficiently and accurately controlling the opening of the air inlet and realizing flexible regulation of the air intake volume.

[0016] Preferably, the lower end of the sliding sealing plate passes through the outer surface of the air intake pipe, and the sliding sealing plate and the air intake pipe are connected by sliding friction.

[0017] The above technical solution ensures that the sliding sealing plate can slide up and down smoothly on the intake pipe, and while adjusting the intake volume, it effectively maintains the sealing between the intake pipe and the sliding sealing plate to prevent air leakage.

[0018] Preferably, the clearance hole passes through the outer surface of the sliding sealing plate, and the clearance hole and the air inlet are arranged in an up-down staggered manner.

[0019] The adoption of the above technical solution makes it possible to finely adjust the air intake volume. By changing the overlapping area of ​​the clearance hole and the air inlet, continuous and precise adjustment of the air intake volume can be achieved to meet the diverse needs for the air intake volume under different working conditions.

[0020] Preferably, both ends of the return pipe are fixedly mounted to the first return seat and the second return seat through flanges and bolts, and both ends of the return pipe are connected to the air intake pipe and one end of the air compressor casing, respectively.

[0021] The adoption of the above technical solution not only shows great convenience during equipment assembly and maintenance, significantly shortening the assembly time and downtime for maintenance, but also ensures that the return air can circulate smoothly and stably between the intake pipe and the air compressor casing, effectively guaranteeing the effective realization of the heat dissipation and cleaning functions.

[0022] Compared with the prior art, the beneficial effects of the present invention are: the gas-suspended oil-free centrifugal direct-drive air compressor:

[0023] 1. During the operation of traditional air compressors, a large amount of heat will be generated due to mechanical friction, and dust in the air will easily accumulate inside the equipment. Excessive temperature and excessive dust accumulation will accelerate the aging and wear of equipment parts and reduce the service life of the equipment. In this solution, a reflux mechanism is set up to guide the output air in a directional manner so that the air can effectively remove the dust and heat in the air compressor during the circulation process, which greatly improves the working environment of the air compressor, reduces failures caused by high temperature and dust, and thus significantly extends the service life of the equipment.

[0024] Furthermore, when the internal temperature of the air compressor is too high, the performance of the lubricating oil will be reduced, affecting the lubrication effect of the mechanical parts, and then causing problems such as increased equipment vibration and increased operating noise. The accumulation of dust may block the airway, affect air circulation, and reduce the compression efficiency of the air compressor. The heat and dust are taken away by the reflux mechanism, which can keep the internal temperature of the air compressor within a reasonable range, ensure that the airway is unobstructed, keep the air compressor in a stable operating state at all times, and provide a continuous and reliable air source for industrial production.

[0025] 2. The concentric arrangement of the compressor housing, main shaft and impeller can evenly distribute the centrifugal force on the impeller during rotation, avoiding unbalanced vibration caused by eccentricity. This stable operation not only reduces the wear between equipment parts and prolongs the service life of the equipment, but also reduces the noise generated during equipment operation, creating a relatively quiet working environment for operators. At the same time, stable operation helps to improve the working efficiency of the air compressor and ensure the stable and reliable quality of compressed air.

[0026] Furthermore, the guide channel adopts a spiral design to guide the air to gradually accelerate along the spiral path during the guide process. When the air is thrown out from the impeller at high speed, it can smoothly enter the spiral guide channel and continuously increase the flow rate therein. This acceleration process not only improves the exhaust efficiency, enabling the air compressor to deliver compressed air faster to meet the demand for air source flow in industrial production, but also better converts the kinetic energy generated by the impeller into the pressure energy of the air. By optimizing the airflow guidance and energy conversion, the compression performance of the air compressor is significantly improved, so that it can output compressed air with higher pressure while consuming the same energy.

[0027] 3. The adjustment rod and the sliding sealing plate work together to accurately control the air intake, so that the operator can easily achieve precise control of the air intake by simply turning the adjustment rod. When the air intake needs to be increased, turn the adjustment rod. Due to the effect of the threaded connection, the sliding sealing plate will slide upward along the outer surface of the intake pipe, thereby increasing the opening of the air inlet and allowing more air to enter the air compressor. Conversely, when the air intake needs to be reduced, turn the adjustment rod counterclockwise, the sliding sealing plate will slide downward, and the opening of the air inlet will be reduced. This flexible adjustment method can adjust the air intake of the air compressor in real time according to different industrial production needs, ensure that the air compressor always operates in the best working state, improve energy utilization efficiency, and avoid energy waste and equipment performance degradation caused by unreasonable air intake;

[0028] Furthermore, by driving the sliding sealing plate to close one end of the air inlet pipe through the adjusting rod, the air can circulate inside the air compressor casing, so that when a specific detergent is mixed in the air to clean the inside of the air compressor casing, the air mixed with the detergent will not be discharged immediately, thereby ensuring the cleaning effect of the inside of the air compressor casing.

[0029] 4. The two ends of the return pipe are fixedly installed with the first return seat and the second return seat by flanges and bolts respectively. This flange and bolt connection method is extremely convenient in the equipment assembly process. Compared with other complex connection methods, the operator can connect the return pipe with the first return seat and the second return seat more quickly and accurately, which greatly shortens the equipment assembly time. In terms of equipment maintenance, when the return pipe needs to be repaired or replaced, it only needs to loosen the bolts to easily disassemble the return pipe, which is convenient and fast, reduces equipment downtime, and improves production efficiency;

[0030] Furthermore, the two ends of the return pipe are respectively connected to the intake pipe and one end of the air compressor housing, and the sealing of the connection is ensured by flange and bolt connection. During the operation of the air compressor, the return air needs to circulate smoothly between the intake pipe and the air compressor housing to achieve the functions of heat dissipation and cleaning. Good sealing can ensure that the return air will not leak at the connection part, so that the air can circulate along the predetermined path;

[0031] Furthermore, the first ball valve is designed to flexibly adjust the amount of diverted air. By controlling the opening and closing degree of the first ball valve, the operator can flexibly adjust the amount of air diverted from the exhaust port for circulation according to actual working conditions. In the early stage of air compressor operation, the internal temperature of the equipment is low, and a large amount of air may not be required for circulating heat dissipation. At this time, the first ball valve can be properly closed to reduce the amount of air diverted. When the air compressor runs for a long time and the internal temperature rises, the first ball valve can be opened to increase the amount of diverted air and enhance the heat dissipation effect. At the same time, by adjusting the second ball valve, detergent can be added to the circulating air, thereby facilitating the cleaning of the inside of the air compressor casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0033] Figure 2 This is a schematic diagram of the three-dimensional structure of the installation base, the air compressor housing and the air intake pipe of the present invention;

[0034] Figure 3 It is a schematic diagram of the three-dimensional structure of the overall cutaway surface of the present invention;

[0035] Figure 4 It is a schematic diagram of the three-dimensional structure of the connection of the mounting frame, the adjusting rod and the sliding sealing plate of the present invention;

[0036] Figure 5 It is a three-dimensional structural schematic diagram of the connection section of the mounting frame, the adjusting rod and the sliding sealing plate of the present invention;

[0037] Figure 6 It is a three-dimensional structural schematic diagram of the air compressor housing, the second return seat and the return pipe connection section of the present invention;

[0038] Figure 7 It is a schematic diagram of the three-dimensional structure of the cross-section surface connecting the flow guide channel and the exhaust port of the present invention;

[0039] Figure 8 It is a three-dimensional structural schematic diagram of the cross-section surface connecting the return pipe and the first diverter seat of the present invention;

[0040] Fig. 9 It is a schematic diagram of the three-dimensional structure of the direct drive motor and the main shaft connected to the present invention;

[0041] Fig.10 It is a schematic diagram of the three-dimensional structure of the connection between the main shaft and the impeller of the present invention.

[0042] In the figure: 1. Mounting base; 2. Air compressor casing; 3. Intake pipe; 4. Direct drive motor; 5. Main shaft; 6. Air suspension bearing; 7. Impeller; 8. Frequency converter; 9. Guide channel; 10. Exhaust port; 11. Lifting ring; 12. Intake port; 13. Mounting frame; 14. Adjustment rod; 15. Sliding sealing plate; 16. Make way hole; 17. Branch pipe; 18. First reflux seat; 19. Second reflux seat; 20. Reflux pipe; 21. First diverter seat; 22. Diverter pipe; 23. First ball valve; 24. Second ball valve. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figure 1-Figure 10 The present invention provides a technical solution: an air-suspended oil-free centrifugal direct-drive air compressor.

[0045] Embodiment 1: This embodiment discloses a mounting base 1, an air compressor casing 2 is fixedly provided on the upper end of the mounting base 1, and an air intake pipe 3 is fixedly provided on one end of the air compressor casing 2, a direct drive motor 4 is installed inside one end of the mounting base 1, and a main shaft 5 is fixedly connected to one end of the output shaft of the direct drive motor 4, an air suspension bearing 6 is provided on the inner surface of the air compressor casing 2, the main shaft 5 is connected to the air compressor casing 2 through the air suspension bearing 6, and an impeller 7 is fixedly connected to one end of the main shaft 5, a frequency converter 8 is fixedly installed on the outer surface of the air compressor casing 2, a flow guide 9 is provided inside the side surface of the air compressor casing 2, and one end of the flow guide 9 passes through the outer surface of the air compressor casing 2, and an exhaust port 10 is fixedly connected to one end of the flow guide 9 located outside the air compressor casing 2, a lifting ring 11 is threadedly connected to the outer surface of the air compressor casing 2, and an air intake port 12 is provided at one end of the air intake pipe 3;

[0046] After the direct drive motor 4 inside one end of the mounting base 1 is powered on and started, the electrical energy is converted into mechanical energy, and the output shaft starts to rotate at a high speed. Since the output shaft of the direct drive motor 4 is fixedly connected to one end of the main shaft 5, this rigid connection enables the rotational power of the direct drive motor 4 to be efficiently and stably transmitted to the main shaft 5, driving the main shaft 5 to rotate synchronously at a high speed. The air suspension bearing 6 arranged on the inner surface of the air compressor housing 2 stably suspends the main shaft 5 by generating a high-pressure air film. When the main shaft 5 starts to rotate driven by the direct drive motor 4, the air in the air suspension bearing 6 forms a dynamic pressure field driven by the high-speed rotating main shaft 5, generating an upward buoyancy sufficient to support the weight of the main shaft 5, so that the main shaft 5 and the air compressor housing 2 are in a stable state. The main shaft 5 is in a non-contact state. This non-contact support method greatly reduces the friction force when the main shaft 5 rotates, reduces energy loss, and also reduces mechanical wear, prolongs the service life of the equipment, and improves the stability and reliability of the equipment operation. As the main shaft 5 rotates at a high speed, the impeller 7 fixed at one end of the main shaft 5 also rotates at a high speed. During the high-speed rotation of the impeller 7, a strong centrifugal force is generated on the air entering from the air inlet 12. The air inlet 12 is located at one end of the air inlet pipe 3. The outside air enters the air inlet pipe 3 from here, and then flows into the inside of the air compressor. Under the action of the high-speed rotation of the impeller 7, the air is quickly thrown to the edge of the impeller 7, so that the air forms a low-pressure area at the center of the impeller 7, thereby continuously New air is sucked in from the air inlet 12, and the air thrown to the edge of the impeller 7 gains higher kinetic energy, and the pressure also increases accordingly. The guide channel 9 opened inside the side surface of the air compressor housing 2 has one end facing the outer surface of the high-speed rotating impeller 7. When the high-pressure air compressed by the impeller 7 reaches the edge of the impeller 7, it will directly enter the guide channel 9. Since the guide channel 9 is designed in a spiral shape, the air flows along a spiral path in the guide channel 9. In this process, the flow rate of the air is further increased, and the kinetic energy is gradually converted into pressure energy. The other end of the guide channel 9 passes through the outer surface of the air compressor housing 2, and an exhaust port 10 is fixedly connected to one end outside the air compressor housing 2. After being accelerated and pressurized by the guide channel 9, the air The high-pressure air is finally discharged through the exhaust port 10, providing compressed air with a certain pressure and flow rate for industrial production. The frequency converter 8 fixedly installed on the outer surface of the air compressor housing 2 is used to control the operation of the direct-drive motor 4. The frequency converter 8 adjusts the speed of the direct-drive motor 4 by changing the power frequency and voltage input to the direct-drive motor 4. According to the changes in the demand for compressed air flow and pressure in the actual production process, the operator can adjust the speed of the direct-drive motor 4 through the frequency converter 8, thereby changing the rotation speed of the impeller 7, so that the air intake, compression degree, exhaust volume and exhaust pressure can be flexibly controlled to meet the demand for compressed air under different working conditions and realize efficient and energy-saving operation of the air compressor;

[0047] The lifting ring 11 threadedly connected to the outer surface of the air compressor casing 2 is mainly used to facilitate the use of lifting equipment to carry and hoist the air compressor during the transportation, installation and maintenance of the equipment. By connecting the lifting rope or hook to the lifting ring 11, it can ensure that the center of gravity of the air compressor is stable during the lifting process and the overall force on the equipment is uniform, thereby avoiding damage to the equipment due to uneven force during the transportation process, thereby ensuring the safety and convenience of equipment transportation.

[0048] Embodiment 2: Based on Embodiment 1, this embodiment discloses that a reflux mechanism is provided on the outer surface of the air compressor housing 2, and the air can remove dust and heat in the air compressor during the circulation process by directional guidance of the output air, so that the air compressor can work in a better environment;

[0049] The reflux mechanism comprises: a mounting frame 13, the mounting frame 13 is fixedly arranged on the outer surface of the intake pipe 3, and a rotating adjustment rod 14 is installed on the upper end of the mounting frame 13, and a sliding sliding sealing plate 15 is installed on the outer surface of the mounting frame 13, and a clearance hole 16 is opened at the lower end of the sliding sealing plate 15;

[0050] The reflux mechanism further includes: a branch pipe 17, the branch pipe 17 penetrates the outer surface of the intake pipe 3, and a first reflux seat 18 is fixedly provided at the lower end of the branch pipe 17, a second reflux seat 19 is fixedly installed at one end of the air compressor housing 2, and a reflux pipe 20 is connected between the second reflux seat 19 and the first reflux seat 18;

[0051] The reflux mechanism further includes: a first shunt seat 21, the first shunt seat 21 is fixedly mounted on one side outer surface of the air compressor housing 2, and one end of the first shunt seat 21 penetrates the inner surface of the air compressor housing 2, one end of a shunt pipe 22 is mounted on the outer surface of the upper end of the exhaust port 10, and the other end of the shunt pipe 22 is fixedly connected to the first shunt seat 21;

[0052] A first ball valve 23 is installed in series at one end of the shunt pipe 22 connected to the exhaust port 10, and a second ball valve 24 is fixedly installed on the side surface of one end of the shunt pipe 22 connected to the first shunt seat 21, and one end of the second ball valve 24 passes through the inner surface of the shunt pipe 22;

[0053] The air compressor housing 2, the main shaft 5 and the impeller 7 are arranged concentrically, the flow guide 9 is designed in a spiral shape, and the end of the flow guide 9 facing the inside of the air compressor housing 2 is arranged directly opposite to the outer surface of the impeller 7;

[0054] The adjusting rod 14 is rotatably connected to the air inlet pipe 3, and the adjusting rod 14 is threadably connected to the sliding sealing plate 15;

[0055] The lower end of the sliding sealing plate 15 penetrates the outer surface of the intake pipe 3, and the sliding sealing plate 15 and the intake pipe 3 are connected by sliding friction;

[0056] The clearance hole 16 penetrates the outer surface of the sliding sealing plate 15, and the clearance hole 16 and the air inlet 12 are arranged in an up-down staggered manner;

[0057] The two ends of the return pipe 20 are fixedly installed with the first return seat 18 and the second return seat 19 through flanges and bolts, and the two ends of the return pipe 20 are respectively connected with the intake pipe 3 and one end of the air compressor housing 2;

[0058] When the operator needs to adjust the air intake, the adjusting rod 14 on the mounting frame 13 is rotated. Based on the threaded transmission, the sliding sealing plate 15 will slide up and down along the outer surface of the intake pipe 3. Since the clearance hole 16 and the air inlet 12 are arranged in an up-and-down offset manner, as the sliding sealing plate 15 moves, the effective ventilation area of ​​the air inlet 12 changes, thereby achieving precise control of the air intake. The adjusting rod 14 is rotated, the sliding sealing plate 15 slides upward, the overlapping area of ​​the clearance hole 16 and the air inlet 12 increases, and the air intake increases. The reverse rotation The adjusting rod 14 is moved to reduce the air intake amount. In addition, when the adjusting rod 14 drives the sliding sealing plate 15 to close one end of the air intake pipe 3, the air can circulate inside the air compressor housing 2. When it is necessary to clean the inside of the air compressor housing 2, a specific cleaning agent is mixed into the air. Since the air cannot be normally discharged from the air intake pipe 3 at this time, the air mixed with the cleaning agent will fully circulate in the air compressor housing 2, thereby ensuring the cleaning effect of the inside of the air compressor housing 2 and effectively removing the dirt and impurities accumulated inside.

[0059] The two ends of the return pipe 20 are fixedly installed with the first return seat 18 and the second return seat 19 by flanges and bolts respectively. This connection method has significant advantages in the equipment assembly process. Compared with other complex connection methods, the operator can connect the return pipe 20 with the first return seat 18 and the second return seat 19 more quickly and accurately, which greatly shortens the equipment assembly time. During equipment maintenance, if the return pipe 20 needs to be repaired or replaced, it only needs to loosen the bolts to easily disassemble the return pipe 20. The operation is convenient and fast, which reduces the equipment downtime and improves the overall production efficiency. The air intake pipe 3 and one end of the air compressor housing 2 are connected separately, and the sealing of the connection is ensured by flange and bolt connection. When the air compressor is running, the return air needs to circulate smoothly between the air intake pipe 3 and the air compressor housing 2 to achieve heat dissipation and cleaning functions. Good sealing ensures that the return air will not leak at the connection part, so that the air can circulate strictly according to the predetermined path. During the heat dissipation process, the high-temperature air inside the air compressor is introduced into the vicinity of the air intake pipe 3 through the return pipe 20 at the lower end of the branch pipe 17, and heat is exchanged with the relatively low-temperature air in the air intake pipe 3, thereby reducing the internal temperature of the air compressor;

[0060] The first ball valve 23 is installed at the connection end of the shunt pipe 22 and the exhaust port 10. By controlling the opening and closing degree of the first ball valve 23, the operator can flexibly adjust the amount of air diverted from the exhaust port 10 for circulation according to actual working conditions. In the initial stage of the air compressor operation, the internal temperature of the equipment is low and a large amount of air is not required for circulating heat dissipation. At this time, the first ball valve 23 can be properly closed to reduce the amount of diverted air. When the air compressor runs for a long time and the internal temperature rises, the first ball valve 23 is opened to increase the amount of diverted air and enhance the heat dissipation effect. The second ball valve 24 is installed on the side surface of one end of the shunt pipe 22 connected to the first shunt seat 21, and one end thereof passes through the inner surface of the shunt pipe 22. By adjusting the second ball valve 24, detergent can be added to the circulating air. When it is necessary to clean the inside of the air compressor casing 2, the second ball valve 24 is opened to inject the detergent into the shunt pipe 22 so that it enters the inside of the air compressor casing 2 along with the circulating air, thereby facilitating comprehensive cleaning of the inside of the air compressor casing 2, effectively removing impurities such as dust and oil inside, and maintaining the good operating condition of the air compressor.

[0061] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. An air-suspended oil-free centrifugal direct-drive air compressor, comprising a mounting base (1), an air compressor housing (2) being fixedly arranged at the upper end of the mounting base (1), and an air intake pipe (3) being fixedly arranged at one end of the air compressor housing (2), a direct-drive motor (4) being installed inside one end of the mounting base (1), and a main shaft (5) being fixedly connected to one end of an output shaft of the direct-drive motor (4), characterized in that: The inner surface of the air compressor housing (2) is provided with an air suspension bearing (6), the main shaft (5) is connected to the air compressor housing (2) via the air suspension bearing (6), and one end of the main shaft (5) is fixedly connected to an impeller (7), the outer surface of the air compressor housing (2) is fixedly mounted with a frequency converter (8), the inner side surface of the air compressor housing (2) is provided with a flow guide (9), and one end of the flow guide (9) penetrates the outer side surface of the air compressor housing (2), and the end of the flow guide (9) located outside the air compressor housing (2) is fixedly connected to an exhaust port (10), the outer surface of the air compressor housing (2) is threadedly connected with a lifting ring (11), one end of the air intake pipe (3) is provided with an air intake port (12), and the outer surface of the air compressor housing (2) is provided with a reflux mechanism, which can remove dust and heat in the air compressor during the circulation process by directional flow guidance of the output air, so that the air compressor can work in a better environment.

2. The air-suspended oil-free centrifugal direct-drive air compressor according to claim 1, characterized in that: The reflux mechanism comprises: a mounting frame (13), the mounting frame (13) being fixedly arranged on the outer surface of the intake pipe (3), a rotating adjustment rod (14) being installed at the upper end of the mounting frame (13), and a sliding sliding sealing plate (15) being installed on the outer surface of the mounting frame (13), and a clearance hole (16) being opened at the lower end of the sliding sealing plate (15).

3. The air-suspended oil-free centrifugal direct-drive air compressor according to claim 2, characterized in that: The reflux mechanism further comprises: a branch pipe (17), the branch pipe (17) penetrates the outer surface of the intake pipe (3), and a first reflux seat (18) is fixedly provided at the lower end of the branch pipe (17), a second reflux seat (19) is fixedly installed at one end of the air compressor casing (2), and a reflux pipe (20) is connected between the second reflux seat (19) and the first reflux seat (18).

4. The air-suspended oil-free centrifugal direct-drive air compressor according to claim 3, characterized in that: The reflux mechanism further comprises: a first diverter seat (21), the first diverter seat (21) being fixedly mounted on an outer surface of one side of the air compressor housing (2), and one end of the first diverter seat (21) passing through the inner surface of the air compressor housing (2), one end of a diverter pipe (22) being mounted on the outer surface of the upper end of the exhaust port (10), and the other end of the diverter pipe (22) being fixedly connected to the first diverter seat (21).

5. The air-suspended oil-free centrifugal direct-drive air compressor according to claim 4, characterized in that: A first ball valve (23) is installed in series on one end of the diverter pipe (22) connected to the exhaust port (10), and a second ball valve (24) is fixedly installed on the side surface of one end of the diverter pipe (22) connected to the first diverter seat (21), and one end of the second ball valve (24) passes through the inner surface of the diverter pipe (22).

6. The air-suspended oil-free centrifugal direct-drive air compressor according to claim 1, characterized in that: The air compressor casing (2), the main shaft (5) and the impeller (7) are arranged concentrically, the flow guide channel (9) is designed in a spiral shape, and the end of the flow guide channel (9) facing the inside of the air compressor casing (2) is arranged to face the outer surface of the impeller (7).

7. The air-suspended oil-free centrifugal direct-drive air compressor according to claim 2, characterized in that: The adjusting rod (14) is rotationally connected to the air intake pipe (3), and the adjusting rod (14) is threadedly connected to the sliding sealing plate (15).

8. The air-suspended oil-free centrifugal direct-drive air compressor according to claim 2, characterized in that: The lower end of the sliding sealing plate (15) penetrates the outer surface of the air intake pipe (3), and the sliding sealing plate (15) and the air intake pipe (3) are connected by sliding friction.

9. The air-suspended oil-free centrifugal direct-drive air compressor according to claim 2, characterized in that: The clearance hole (16) penetrates the outer surface of the sliding sealing plate (15), and the clearance hole (16) and the air inlet (12) are arranged in an up-down staggered manner.

10. The air-suspended oil-free centrifugal direct-drive air compressor according to claim 3, characterized in that: The two ends of the return pipe (20) are fixedly mounted to the first return seat (18) and the second return seat (19) via flanges and bolts, respectively, and the two ends of the return pipe (20) are respectively connected to the air intake pipe (3) and one end of the air compressor casing (2).

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