An air-cooled bearing box structure for a centrifugal fan and a transmission group of a centrifugal fan

Abstract

The present invention discloses a structure of an air-cooled bearing box for a centrifugal fan and a transmission group of a centrifugal fan. The present invention relates to the technical field of bearing boxes. By setting a lubrication execution component, it is possible to use the first oil slinger to sling out the lubricating oil with a lower temperature in the low-temperature oil cavity, and part of the slung-out lubricating oil can enter the bearing installation cavity for lubrication, achieving the purpose of automatic lubrication using the power of its own transmission shaft. By setting a lubricating oil preliminary cooling component, the lubricating oil that has been heated up and contains impurities can be slung into the arc-shaped heat dissipation channel by the second oil slinger, and heat exchange is carried out with the outer wall of the upper box and the external air, thereby achieving the purpose of preliminary cooling. By setting a multi-stage purification component in the lubricating oil treatment component, it is possible to filter and process metal impurities with different particle sizes in the lubricating oil when the lubricating oil passes through the first-stage filtration chamber, the second-stage filtration chamber, and the third-stage filtration chamber, and various precision purification treatments can be carried out on the lubricating oil while dissipating heat.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing boxes, and specifically to an air-cooled bearing box structure for a centrifugal fan and a transmission group of a centrifugal fan. Background Art

[0002] The air-cooled bearing box of a centrifugal fan is an important part of the centrifugal fan, mainly including a bearing box, bearings and a sealing device. The bearing box is the main component that supports and houses the bearings, providing a reliable support point for the rotating shaft, and also bearing the weight from the rotating shaft and the impeller, as well as the radial and axial forces generated during operation. The sealing device prevents the leakage of lubricating oil and the entry of external impurities.

[0003] For an air-cooled rolling bearing box of a centrifugal fan disclosed in the patent application with the publication number CN211343464U, through the structural form of arranging an oil slinger on a section of the ventilation fan rotating shaft inside the oil storage cavity and close to the axial flow cooling fan, its design is reasonable and the structure is compact. It can effectively cool the rolling bearings and the bearing housing in a high-temperature operating environment without cooling water, ensuring the safe and stable operation of the fan. It not only saves a large amount of water and electricity resources for the fan users, but also can effectively avoid environmental pollution;

[0004] The bearing box structure in the above-mentioned prior art has the following defects in actual use:

[0005] The existing bearing box only relies on the heat exchange between the box wall and the air to cool the lubricating oil. However, due to the relatively small volume of the bearing box body itself, the area available for heat exchange between the lubricating oil and the air is extremely limited, and the flow channel for lubricating oil heat dissipation is short. When the temperature of the lubricating oil has not dropped to an appropriate temperature, it is transported to the bearing position to participate in the lubrication work again, and with the accumulation of working time, the temperature of the lubricating oil rises rapidly, resulting in a decrease in the viscosity of the lubricating oil and affecting the lubrication effect;

[0006] Since the heat dissipation amount in the bearing box is the same under different environments, in a cold environment where excessive heat dissipation is not required, the bearing box is extremely likely to have an increased viscosity of the lubricating oil due to excessive heat dissipation, thus unable to fully lubricate the bearings and exacerbating the wear of the bearings;

[0007] Due to mechanical wear, metal debris is mixed in the lubricating oil. During the flow of the lubricating oil, the metal debris inside will enter the bearing again, causing wear to the operation of the bearings;

[0008] Therefore, the present invention proposes an air-cooled bearing box structure for a centrifugal fan and a transmission group of a centrifugal fan to solve the above problems. Summary of the Invention

[0009] Aiming at the deficiencies of the prior art, the present invention provides an air-cooled bearing box structure for a centrifugal ventilator and a transmission group of the centrifugal fan, which solves the problems that the area of the bearing box body that can provide heat exchange between lubricating oil and air is extremely limited, and the flow channel for lubricating oil heat dissipation is short, resulting in the lubricating oil being transported to the bearing position to participate in the lubrication work before the temperature drops to a suitable temperature, and the temperature of the lubricating oil rises rapidly with the accumulation of working time, causing the viscosity of the lubricating oil to decrease and affecting the lubrication effect. Moreover, the heat dissipation amount in the bearing box is the same under different environments, resulting in the lubricating oil viscosity increasing easily due to excessive heat dissipation in the bearing box in a severe cold environment when there is no need for excessive heat dissipation, thus unable to fully lubricate the bearing, and the metal friction debris mixed in the lubricating oil will enter the bearing interior again during the flow process, causing wear to the operation of the bearing.

[0010] To achieve the above objectives, the present invention is realized through the following technical solutions: An air-cooled bearing box structure for a centrifugal ventilator, comprising a lower box body and an upper box body arranged on top of it. A transmission shaft is rotatably arranged inside the lower box body and the upper box body through bearings. It further includes:

[0011] A lubrication execution component, which includes a buffer oil cavity and a bearing installation cavity commonly opened on both sides inside the lower box body and the upper box body. The buffer oil cavity and the bearing installation cavity are connected through an oil return channel. A pressure-bearing cover is fixedly arranged on the side wall of the bearing installation cavity. An oil inlet groove communicating with the inside of the bearing installation cavity is opened on the top of the pressure-bearing cover. A first oil slinger for slinging lubricating oil into the oil inlet groove is fixedly sleeved on the outer wall of the transmission shaft.

[0012] A primary lubricating oil cooling component, which includes a high-temperature oil cavity and a low-temperature oil cavity opened on both the left and right sides inside the lower box body. The high-temperature oil cavity and the low-temperature oil cavity are connected through an oil return hole. Return flow channels are opened on both outer sides of the high-temperature oil cavity. An arc-shaped heat dissipation oil channel is opened inside the upper box body. An oil slinging channel communicating with the arc-shaped heat dissipation oil channel is opened on the top of the buffer oil cavity. A second oil slinger is fixedly sleeved on the outer wall of the transmission shaft and located inside the buffer oil cavity. And oil guide grooves connecting the two ends of the arc-shaped heat dissipation oil channel are respectively opened on both sides of the top of the lower box body. The lubricating oil preliminarily cooled by the primary lubricating oil cooling component is then secondary cooled by two lubricating oil treatment mechanisms.

[0013] Furthermore, the air-cooled bearing box structure of the centrifugal ventilator further includes a spoiler fan fixedly sleeved on the outer wall of the transmission shaft for disturbing the air around the lubricating oil treatment mechanism to accelerate the heat exchange speed between the lubricating oil treatment mechanism and the air.

[0014] Two lubricating oil treatment mechanisms are respectively arranged on both sides of the outer wall of the lower box. The lubricating oil treatment mechanism is used to connect the two spaces of the oil guide groove and the low-temperature oil cavity on the same side, can adjust the heat dissipation amount per unit time according to the use environment, and while cooling the lubricating oil, perform multi-stage filtration on the lubricating oil to remove metal impurities with different particle sizes in the lubricating oil.

[0015] Further, the lubricating oil treatment mechanism includes an upper vertical plate and a lower vertical plate detachably arranged at the upper and lower relative positions on the same side of the outer wall of the lower box. A plurality of cross-shaped chutes I are uniformly arranged on the outer wall of the upper vertical plate. A drain through hole communicating with the oil guide groove is arranged at the middle position of each cross-shaped chute I. And a plurality of screws corresponding to the positions of the cross-shaped chutes I are uniformly arranged at the top of the upper vertical plate. Each screw threadedly penetrates through the upper vertical plate and extends to the outside.

[0016] Further, a plurality of cross-shaped chutes II corresponding to the positions of the cross-shaped chutes I are uniformly arranged on the outer wall of the lower vertical plate. An oil inlet through hole communicating with the return flow groove is arranged in each cross-shaped chute II. A lubricating oil treatment component is jointly arranged in the cross-shaped chute I and the cross-shaped chute II at the relative positions. The bottom end of the screw is rotatably arranged on the top of the lubricating oil treatment component at the corresponding position.

[0017] Further, the lubricating oil treatment component includes a heat exchange tube and a plurality of heat dissipation fins uniformly fixed on its outer wall. A pick-up opening is arranged on the outer wall of the heat exchange tube. And a multi-stage purification unit for filtering the lubricating oil is detachably arranged inside the heat exchange tube. The multi-stage purification unit can be detachably taken out of the heat exchange tube through the pick-up opening. And a first slider and a second slider are respectively fixedly sleeved at both ends of the heat exchange tube.

[0018] Further, the multi-stage purification unit includes a purification cylinder sealed and slidably arranged inside the heat exchange tube and a bearing column fixedly arranged at the center position of the inner cavity bottom of the purification cylinder. A lifting through groove is arranged inside the bearing column. And a partition plate is jointly fixedly arranged between the lifting through groove and the opposite side walls of the purification cylinder. A plurality of first limiting sliding sleeves are uniformly fixedly arranged on the inner wall of the purification cylinder. And a plurality of second limiting sliding sleeves corresponding to the positions of the first limiting sliding grooves are fixedly arranged on the outer wall of the bearing column. A primary filter plate, a secondary filter plate and a tertiary filter plate are respectively detachably arranged in a plurality of opposite-positioned first limiting sliding sleeves and second limiting sliding sleeves. And the inner diameters of the filter holes of the primary filter plate, the secondary filter plate and the tertiary filter plate decrease in sequence.

[0019] Furthermore, the primary filter plate, secondary filter plate, tertiary filter plate, and partition divide the internal space of the purification cylinder into four spaces: a primary filtration chamber, a secondary filtration chamber, a tertiary filtration chamber, and an output buffer chamber. A discharge port is provided at the bottom of the inner cavity of the purification cylinder and between the tertiary filter plate and the partition. A first drainage pipe is fixedly provided at the bottom of the purification cylinder, and a cleaning assembly for simultaneously scrubbing the outer walls of the primary filter plate, secondary filter plate, and tertiary filter plate is also provided inside the purification cylinder.

[0020] Furthermore, the cleaning assembly includes a main lifting rod that slidably penetrates through the lifting through groove. A bearing plate is fixedly provided at the bottom end of the main lifting rod and below the first drainage pipe. A plurality of horizontal support plates are also fixedly provided at the top end of the main lifting rod. A secondary lifting rod is fixedly provided at the bottom of each horizontal support plate. A plurality of scrubbing plates are evenly fixedly provided on the outer wall of the secondary lifting rod. A spring retaining ring is provided on the outer wall of the main lifting rod inside the lifting through groove. A spring is slidably sleeved on the outer wall of the main lifting rod below the spring retaining ring. A spring limiting block is also fixedly provided on the inner wall of the lifting through groove at the bottom of the spring.

[0021] Furthermore, a sealing cover plate is detachably provided at the top of the purification cylinder, and a filtering through hole is provided at the top of the sealing cover plate and opposite to the area of the primary filtration chamber. A sealing cover plate is fixedly provided inside the filtering through hole. A pull ring is fixedly provided at the top of the sealing cover plate through a pull rod.

[0022] In a second aspect, the present invention also discloses a centrifugal fan drive group, including a coupling for connecting the fan and the motor. The coupling completes the synchronous rotation between the motor and the fan rotor by transmitting torque, and also includes a centrifugal fan air-cooled bearing box structure.

[0023] The present invention provides a centrifugal fan air-cooled bearing box structure and a centrifugal fan drive group. Compared with the prior art, the following beneficial effects are achieved:

[0024] 1. A centrifugal fan air-cooled bearing box structure and a centrifugal fan drive group can, by setting a lubrication execution assembly, use the first oil slinger to sling out the lubricating oil with a lower temperature in the low-temperature oil chamber, and enable a part of the slung-out lubricating oil to enter the bearing installation chamber for lubrication, achieving the purpose of automatic lubrication using the power of its own transmission shaft.

[0025] By setting up the lubricating oil preliminary cooling component, the lubricating oil that has been heated up and contains impurities can be thrown into the arc-shaped heat dissipation channel by the second oil slinger, and heat exchange is carried out with the outer wall of the upper casing and the external air, so as to achieve the purpose of preliminary cooling. Since the heat dissipation channel is designed in an arc shape, it can increase the flow time of the lubricating oil, thereby prolonging the heat exchange time between the lubricating oil and the air and achieving the purpose of accelerating cooling. In the present invention, both the bearing lubrication process and the lubricating oil preliminary cooling process are realized by the power drive of the transmission shaft operation, and there is no need to separately set up a drive device for the bearing lubrication process and the lubricating oil preliminary cooling process, thus making the structure simpler and reducing the design and manufacturing difficulty.

[0026] 2. A centrifugal fan air-cooled bearing box structure and a centrifugal fan transmission group. By setting up a lubricating oil treatment mechanism, the lubricating oil in the arc-shaped heat dissipation channel can be diverted and introduced into a plurality of lubricating oil treatment components, and each lubricating oil treatment component is used as an independent heat dissipation unit to carry out heat exchange with the external air, so as to increase the heat exchange area between the lubricating oil and the air and achieve the secondary cooling of the lubricating oil.

[0027] Moreover, each lubricating oil treatment component can slide up and down on the outer walls of the upper vertical plate and the lower vertical plate to achieve the blocking or connection between the lubricating oil treatment component and the upper oil discharge through hole and the oil inlet through hole at the corresponding position, thereby controlling the number of lubricating oil treatment components participating in the lubricating oil cooling work. After the number of lubricating oil treatment components participating in the work increases, the heat dissipation amount of the lubricating oil per unit time can be increased, and vice versa, the heat dissipation amount of the lubricating oil per unit time can be reduced, so that the temperature of the lubricating oil can be appropriately adjusted under different working environment temperatures, avoiding the situation that the lubricating oil temperature is too high or too low to fully cool the bearing.

[0028] 3. A centrifugal fan air-cooled bearing box structure and a centrifugal fan transmission group. By setting up a multi-stage purification component in the lubricating oil treatment component, when the lubricating oil passes through the primary filtration chamber, the secondary filtration chamber and the tertiary filtration chamber, different particle size metal impurities in the lubricating oil can be filtered, and various precision purification treatments can be carried out on the lubricating oil while achieving heat dissipation.

[0029] By setting up a cleaning component, the impact force of the lubricating oil discharged through the first drainage pipe can be used to push the bearing plate to move. At the same time, by using the characteristic of the non-constant flow rate of the lubricating oil, when the lubricating oil with a large flow rate acts on the bearing plate, it can push the bearing plate to move down a large distance. When the flow rate of the lubricating oil acting on the bearing plate decreases, the bearing plate can reset under the action of the spring force and continue to move up due to the inertia of the upward movement, that is, the brush plate moves up and down reciprocally in a "jittering" manner, so that the brush plate can slide up and down along the surface of the primary filter plate or the secondary filter plate or the tertiary filter plate at the corresponding position, peeling off the metal debris on the surfaces of the primary filter plate, the secondary filter plate and the tertiary filter plate, and improving the filtration efficiency of the lubricating oil.

[0030] 4. A structure of an air-cooled bearing box of a centrifugal fan and a transmission group of a centrifugal fan. The multi-stage purification unit and the heat exchange pipe are designed in a split manner. By pulling the pull ring, it can be taken out from the heat exchange pipe, so as to facilitate the cleaning and replacement of the primary filter plate, the secondary filter plate or the tertiary filter plate. Moreover, when cleaning any one of the lubricating oil treatment components, it can be made to be independent from the lubricating oil filtration work first, even if the ends of the heat exchange pipe and the oil discharge through holes and oil inlet through holes at the corresponding positions are misaligned, blocking the flow of lubricating oil, so that when cleaning any one of the lubricating oil treatment components, it will not affect the lubricating oil treatment components at other positions, enabling the structure of the air-cooled bearing box of the centrifugal fan and the transmission group of the centrifugal fan to continue to work.

[0031] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0033] Figure 2 It is a schematic diagram of the second overall three-dimensional structure of the present invention;

[0034] Figure 3 It is a schematic diagram of the first sectional structure of the present invention;

[0035] Figure 4 It is a schematic diagram of the second sectional structure of the present invention;

[0036] Figure 5 It is a schematic diagram of the third sectional structure of the present invention;

[0037] Figure 6 It is for the present invention Figure 5 The enlarged schematic diagram of part A;

[0038] Figure 7 It is a schematic diagram of the first disassembled state structure of the present invention;

[0039] Figure 8 It is a schematic diagram of the second disassembled state structure of the present invention;

[0040] Figure 9 It is a schematic diagram of the third disassembled state structure of the present invention;

[0041] Figure 10 It is a schematic diagram of the first disassembled state structure of the lubricating oil treatment mechanism of the present invention;

[0042] Figure 11 It is a schematic structural diagram of the second disassembled state of the lubricating oil treatment mechanism of the present invention;

[0043] Figure 12 It is a schematic structural diagram of the disassembled state of the lubricating oil treatment component of the present invention;

[0044] Figure 13 It is a schematic cross-sectional structural diagram of the lubricating oil treatment component of the present invention;

[0045] Figure 14 It is a schematic structural diagram of the disassembled state of the multi-stage purification unit of the present invention;

[0046] Figure 15 It is a schematic structural diagram of the bottom state of the purification cylinder of the present invention;

[0047] Figure 16 It is a schematic internal structural diagram of the purification cylinder of the present invention;

[0048] Figure 17 It is a schematic structural diagram of the state of removing the cleaning component and the first-stage filter plate, second-stage filter plate, and third-stage filter plate inside the purification cylinder of the present invention;

[0049] Figure 18 It is a schematic structural diagram of the assembled state of the cleaning component and the first-stage filter plate, second-stage filter plate, and third-stage filter plate of the present invention;

[0050] Figure 19 For the present invention Figure 18 The enlarged structural diagram of part B in.

[0051] In the figure: 1. Lower box body; 2. Upper box body; 3. Bearing; 4. Transmission shaft; 5. Buffer oil cavity; 6. Bearing installation cavity; 7. Oil return through groove; 8. High-temperature oil cavity; 9. Low-temperature oil cavity; 10. Oil return hole; 11. Pressure-bearing cover; 12. Oil inlet groove; 13. First oil slinger; 14. Arc-shaped heat dissipation oil passage; 15. Oil slinging through groove; 16. Second oil slinger; 17. Oil guiding groove; 18. Lubricating oil treatment mechanism; 181. Upper vertical plate; 182. Lower vertical plate; 183. First cross-shaped sliding groove; 184. Oil discharge through hole; 185. Screw; 186. Second cross-shaped sliding groove; 187. Oil inlet through hole; 188. Lubricating oil treatment component; 1881. Heat exchange tube; 1882. Pick-up and placement port; 1883. Multi-stage purification unit; a1. Purification cylinder; a2. Bearing column; a3. Lifting through groove; a4. Partition board; a5. First-stage filter plate; a6. Second-stage filter plate; a7. Third-stage filter plate; a9. First-stage filtration cavity; a10. Second-stage filtration cavity; a11. Third-stage filtration cavity; a12. Output buffer cavity; a13. Discharge port; a14. First diversion tube; a15. Lifting main rod; a16. Bearing plate; a17. Horizontal support plate; a18. Lifting sub-rod; a19. Brush plate; a20. Spring retaining ring; a21. Spring; a22. Sealing cover plate; a23. Second diversion tube; a24. Pulling ring; 1884. First slider; 1885. Second slider; 19. Turbulence fan; 20. Return flow through groove. Specific embodiments

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0053] The present invention provides three technical solutions: a structure of an air-cooled bearing box for a centrifugal fan, specifically including the following embodiments:

[0054] As Figures 1 - 9 The first embodiment is shown: a structure of an air-cooled bearing box for a centrifugal fan, including a lower box body 1 and an upper box body 2 provided on its top. The lower box body 1 and the upper box body 2 are jointly provided with a transmission shaft 4 rotatably arranged through a bearing 3 inside. The lower box body 1 and the upper box body 2 are connected by bolts, and a gasket is also provided between the lower box body 1 and the upper box body 2 to prevent lubricating oil from leaking. It also includes:

[0055] Lubrication execution component, which includes a buffer oil cavity 5 and a bearing installation cavity 6 commonly opened on both sides inside the lower box body 1 and the upper box body 2. The buffer oil cavity 5 and the bearing installation cavity 6 are connected through an oil return groove 7. A pressure-bearing cover 11 is fixedly arranged on the side wall of the bearing installation cavity 6. An oil inlet groove 12 communicating with the inside of the bearing installation cavity 6 is opened at the top of the pressure-bearing cover 11. A first oil slinger 13 for slinging lubricating oil into the oil inlet groove 12 is fixedly sleeved on the outer wall of the transmission shaft 4. The first oil slinger 13 is located inside the low-temperature oil cavity 9, and the bottom of the first oil slinger 13 is immersed in the lubricating oil located inside the low-temperature oil cavity 9. The lubricating oil inside the oil inlet groove 12 enters the bearing installation cavity 6 to lubricate the bearing 3, and then enters the buffer oil cavity 5 through the oil return groove 7 and waits to be slung into the arc-shaped heat dissipation oil passage 14 by the second oil slinger 16 for preliminary cooling. It should be noted here that the design of the first oil slinger 13 can ensure that the slung lubricating oil moves towards the direction of the oil inlet groove 12;

[0056] Lubricating oil preliminary cooling component, which includes a high-temperature oil cavity 8 and a low-temperature oil cavity 9 opened on both the left and right sides inside the lower box body 1. The temperature range of the high-temperature oil cavity 8 is 55°C - 65°C, and the temperature range of the low-temperature oil cavity 9 is 35°C - 45°C. The high-temperature oil cavity 8 and the low-temperature oil cavity 9 are connected through an oil return hole 10. Oil return grooves 20 are opened on both sides of the outer wall of the high-temperature oil cavity 8, and an arc-shaped heat dissipation oil passage 14 is opened inside the upper box body 2. An oil slinging groove 15 communicating with the arc-shaped heat dissipation oil passage 14 is opened at the top of the buffer oil cavity 5. A second oil slinger 16 is fixedly sleeved on the outer wall of the transmission shaft 4 and located inside the buffer oil cavity 5. Oil guide grooves 17 connected to both ends of the arc-shaped heat dissipation oil passage 14 are respectively opened on both sides of the top of the lower box body 1. The lubricating oil preliminarily cooled by the lubricating oil preliminary cooling component is further cooled twice by two lubricating oil treatment mechanisms 18. When the second oil slinger 16 rotates, the lubricating oil located inside the buffer oil cavity 5 is slung into the arc-shaped heat dissipation oil passage 14 through the oil slinging groove 15, and preliminary heat dissipation is carried out through the heat exchange between the outer wall of the upper box body 2 and the air.

[0057] In this embodiment, two lubricating oil treatment mechanisms 18 are respectively arranged on both sides of the outer wall of the lower box body 1. The lubricating oil treatment mechanism 18 is used to connect the two spaces of the oil guide groove 17 and the low-temperature oil cavity 9 on the same side, can adjust the amount of heat dissipation per unit time according to the use environment, and can perform multi-stage filtration on the lubricating oil while cooling the lubricating oil to remove metal impurities with different particle sizes in the lubricating oil.

[0058] As Figures 10 - 13The second embodiment is shown. The lubricating oil treatment mechanism 18 includes an upper vertical plate 181 and a lower vertical plate 182 which are detachably arranged at the upper and lower relative positions on the same side of the outer wall of the lower box body 1. A plurality of cross-shaped chutes 183 are evenly formed on the outer wall of the upper vertical plate 181. Drain through holes 184 communicating with the oil guide groove 17 are formed at the middle positions of each of the cross-shaped chutes 183. And a plurality of screws 185 corresponding to the positions of the cross-shaped chutes 183 are evenly arranged at the top of the upper vertical plate 181. Each screw 185 threadedly penetrates through the upper vertical plate 181 and extends to the outside.

[0059] In this embodiment, a plurality of cross-shaped chutes 186 corresponding to the positions of the cross-shaped chutes 183 are evenly formed on the outer wall of the lower vertical plate 182. Oil inlet through holes 187 communicating with the return flow groove 20 are formed in each of the cross-shaped chutes 186. A lubricating oil treatment component 188 is jointly arranged in the cross-shaped chute 183 and the cross-shaped chute 186 at the relative positions. The bottom end of the screw 185 is rotatably arranged at the top of the lubricating oil treatment component 188 at the corresponding position.

[0060] In this embodiment, the lubricating oil treatment component 188 includes a heat exchange tube 1881 and a plurality of heat dissipation fins evenly fixed on its outer wall. A placement opening 1882 is formed on the outer wall of the heat exchange tube 1881. And a multi-stage purification unit 1883 for filtering lubricating oil is detachably arranged inside the heat exchange tube 1881. The multi-stage purification unit 1883 can be detachably taken out from the heat exchange tube 1881 through the placement opening 1882. And a first slider 1884 and a second slider 1885 are respectively fixedly sleeved at both ends of the heat exchange tube 1881. The first slider 1884 and the second slider 1885 are respectively slidably arranged in the cross-shaped chute 183 and the cross-shaped chute 186 at the corresponding positions. The initial position is when the bottom end of the second slider 1885 abuts against the outer wall of the lower box body 1. At this time, both ends of the heat exchange tube 1881 are communicated with the oil guide groove 17 and the return flow groove 20 respectively. When the top end of the first slider 1884 abuts against the outer wall of the upper vertical plate 181, it is in the upper limit position. At this time, both ends of the heat exchange tube 1881 are not connected to the oil guide groove 17 and the return flow groove 20 at the corresponding positions.

[0061] As Figures 14 - 19The third embodiment is shown. The multi-stage purification unit 1883 includes a purification cylinder a1 slidably and sealingly arranged inside the heat exchange tube 1881, and a bearing column a2 fixedly arranged at the center of the bottom of the inner cavity of the purification cylinder a1. An up-down through groove a3 is formed inside the bearing column a2, and a partition plate a4 is fixedly arranged on the opposite side walls of the up-down through groove a3 and the purification cylinder a1. A plurality of first limiting sliding sleeves are uniformly and fixedly arranged on the inner wall of the purification cylinder a1, and second limiting sliding sleeves corresponding to the positions of the plurality of first limiting sliding grooves are fixedly arranged on the outer wall of the bearing column a2. A primary filter plate a5, a secondary filter plate a6, and a tertiary filter plate a7 are detachably arranged in the first limiting sliding sleeves and the second limiting sliding sleeves at corresponding positions, and the inner diameters of the filter holes of the primary filter plate a5, the secondary filter plate a6, and the tertiary filter plate a7 decrease in sequence.

[0062] In this embodiment, the primary filter plate a5, the secondary filter plate a6, the tertiary filter plate a7, and the partition plate a4 divide the inner space of the purification cylinder a1 into four spaces: a primary filtration chamber a9, a secondary filtration chamber a10, a tertiary filtration chamber a11, and an output buffer chamber a12. A discharge port a13 is formed at the bottom of the inner cavity of the purification cylinder a1 and between the tertiary filter plate a7 and the partition plate a4. A first drainage pipe a14 is fixedly arranged at the bottom of the purification cylinder a1, and a cleaning assembly for simultaneously brushing the outer walls of the primary filter plate a5, the secondary filter plate a6, and the tertiary filter plate a7 is also arranged inside the purification cylinder a1.

[0063] In this embodiment, the cleaning assembly includes a lifting main rod a15 slidably penetrating through the up-down through groove a3. A bearing plate a16 is fixedly arranged at the bottom end of the lifting main rod a15 and below the first drainage pipe a14. A plurality of transverse support plates a17 are also fixedly arranged at the top end of the lifting main rod a15. A lifting secondary rod a18 is fixedly arranged at the bottom of each transverse support plate a17. A plurality of brush plates a19 are uniformly and fixedly arranged on the outer wall of the lifting secondary rod a18. A spring retaining ring a20 is arranged on the outer wall of the lifting main rod a15 and inside the up-down through groove a3. A spring a21 is slidably sleeved on the outer wall of the lifting main rod a15 and below the spring retaining ring a20. A spring limiting block is also fixedly arranged on the inner wall of the up-down through groove a3 and at the bottom of the spring a21. The top end of the spring a21 can be compressed by a relatively small external force. The bearing plate a16 is of a conical structure. A certain distance is reserved between the top end of the lifting main rod a15 and the bottom of the sealing cover plate a22 to meet the moving space when the lifting main rod a15 moves upward, and the amount of lubricating oil entering the purification cylinder a1 never exceeds the tops of the primary filter plate a5, the secondary filter plate a6, the tertiary filter plate a7, and the partition plate a4. The bristles on the side wall of the brush plate a19 are closely arranged against the primary filter plate a5 or the secondary filter plate a6 or the tertiary filter plate a7.

[0064] In this embodiment, a sealing cover plate a22 is detachably arranged at the top of the purification cylinder a1, and a filtering through hole is opened at the top of the sealing cover plate a22 and is opposite to the first-stage filtering cavity a9 area. A sealing cover plate a22 is fixedly arranged in the filtering through hole. A pull ring a24 is fixedly arranged at the top of the sealing cover plate a22 through a pull rod. The pull ring a24 and the access port 1882 are connected by bolts, and a sealing gasket is further arranged between the pull ring a24 and the access port 1882.

[0065] During use, the air-cooled bearing box is used for the transmission group of medium and large centrifugal fans. When the air-cooled bearing box is operating, the first oil slinger 13 rotates synchronously with the transmission shaft 4. Since the bottom of the first oil slinger 13 is immersed in the lubricating oil in the low-temperature oil cavity 9, when it rotates, under the action of centrifugal force, part of the lubricating oil is thrown out by the first oil slinger 13 and enters the bearing installation cavity 6 through the oil inlet groove 12 to lubricate the bearing 3. The lubricating oil takes away part of the heat in the bearing installation cavity 6 and the metal chips generated by friction. The high-temperature lubricating oil mixed with impurities enters the buffer oil cavity 5 through the oil return through groove 7 for temporary buffering.

[0066] Since the bottom of the second oil slinger 16 is immersed in the lubricating oil in the buffer oil cavity 5, when the second oil slinger 16 rotates synchronously with the transmission shaft 4, the lubricating oil attached to the outer wall of the second oil slinger 16 is thrown out under the action of centrifugal force. Part of the lubricating oil enters the arc-shaped heat dissipation oil passage 14 through the oil slinging through groove 15 and exchanges heat with the external air through the outer wall of the upper box body 2. At this time, the temperature of the lubricating oil is initially reduced. The cooled lubricating oil enters the oil guide grooves 17 connected to both ends of the arc-shaped heat dissipation oil passage 14 through both ends of the arc-shaped heat dissipation oil passage 14. The lubricating oil enters the heat exchange tube 1881 through the oil discharge through holes 184 in the plurality of lubricating oil treatment components 188 and exchanges heat with the external air again through the outer wall of the heat exchange tube 1881. At this time, the temperature of the lubricating oil is further reduced, and the turbulence fan 19 can disturb the surrounding air and accelerate the flow of the air near the lubricating oil treatment mechanism 18, thereby accelerating the cooling speed of the lubricating oil.

[0067] After the lubricating oil enters the heat exchange pipe 1881, it first enters the first-stage filtration chamber a9 area opposite to the bottom position of the drainage pipe two a23 through the drainage pipe two a23. Then, the lubricating oil sequentially passes through the first-stage filter plate a5, the second-stage filter plate a6, and the third-stage filter plate a7 and enters the output buffer chamber a12 area. At this time, large particles, smaller particles, and tiny particle metal debris in the lubricating oil are all filtered. The clean and cooled lubricating oil flushes the top of the bearing plate a16 through the discharge port a13 and the drainage pipe one a14. Since the amount of lubricating oil flowing down through the drainage pipe one a14 is not fixed, the impact force acting on the top of the bearing plate a16 is not fixed. Under the action of a larger impact force, the bearing plate a16 moves downward by a larger distance. At this time, the lifting main rod a15 synchronously pulls down multiple lifting auxiliary rods a18 to move. During the downward movement of the multiple brush plates a19, they brush the filter surfaces in a certain area of the first-stage filter plate a5, the second-stage filter plate a6, or the third-stage filter plate a7 at the corresponding positions. Similarly, when a smaller impact force is received on the top of the bearing plate a16, the lifting main rod a15 resets under the elastic force of the spring a21, that is, the multiple brush plates a19 move upward synchronously. Since there are multiple brush plates a19 and the distance between adjacent two brush plates a19 is set to be small, the entire filter surfaces of the first-stage filter plate a5, the second-stage filter plate a6, or the third-stage filter plate a7 can be covered during the up and down movement of the brush plates a19. The multiple brush plates a19 perform the brushing operation in a reciprocating and vibrating manner up and down;

[0068] The filtered lubricating oil enters the return flow groove 20 through the bottom end of the heat exchange pipe 1881 and then enters the high-temperature oil chamber 8 for calming. Subsequently, the lubricating oil enters the low-temperature oil chamber 9 through the oil return hole 10 and is again thrown out by the first oil slinger 13 into the oil inlet groove 12 for lubrication work;

[0069] When it is necessary to adjust the cooling capacity of the lubricating oil, the lubricating oil treatment component 188 at the corresponding position is pulled upward by rotating the screw rod 185. The second slider 1885 in the lubricating oil treatment component 188 at the corresponding position moves upward along the cross-shaped chute two 186, and the opening at the bottom end of the heat exchange pipe 1881 is also gradually misaligned from the position opposite to the oil inlet through hole 187 until the first slider 1884 moves upward along the cross-shaped chute one 183 and abuts against the outer wall of the upper vertical plate 181. At this time, the upper end opening of the heat exchange pipe 1881 moves away from the oil discharge through hole 184 and forms a sealed structure with the inner wall of the cross-shaped chute one 183, and the first slider 1884 blocks the oil discharge through hole 184. At the same time, the bottom end opening of the second slider 1885 moves upward and forms a sealed structure with the inner wall of the cross-shaped chute two 186, and the oil inlet through hole 187 is blocked by the second slider 1885. The lubricating oil cannot flow through the heat exchange pipe 1881 at this position. When the number of lubricating oil treatment components 188 participating in the lubricating oil cooling work is reduced, the lubricating oil can only be dissipated through a smaller number of lubricating oil treatment components 188, so as to achieve the purpose of reducing the heat dissipation. On the contrary, when the lubricating oil treatment component 188 is restored to its original position again, it can participate in the cooling work of the lubricating oil and increase the heat dissipation per unit time;

[0070] An embodiment of the present invention further provides a centrifugal fan drive group, including a coupling for connecting the fan and the motor. The coupling completes the synchronous rotation between the motor and the fan rotor by transmitting torque, and further includes a centrifugal fan air-cooled bearing box structure.

[0071] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0072] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A centrifugal fan air-cooled bearing box structure, comprising a lower box and an upper box arranged on the top thereof, wherein a transmission shaft is rotatably arranged inside the lower box and the upper box through a bearing, characterized in that: Also includes: A lubrication actuator assembly, comprising a buffer oil chamber and a bearing installation chamber which are jointly provided on both sides of the lower housing and the upper housing, the buffer oil chamber and the bearing installation chamber being connected via an oil return groove, a pressure cover being fixedly provided on the side wall of the bearing installation chamber, an oil inlet groove being connected to the inside of the bearing installation chamber being provided on the top of the pressure cover, and a No. 1 oil thrower plate for throwing lubricating oil into the oil inlet groove being fixedly provided on the outer wall of the transmission shaft; A lubricating oil preliminary cooling component, comprising a high-temperature oil chamber and a low-temperature oil chamber opened on the left and right sides of the lower box body, the high-temperature oil chamber and the low-temperature oil chamber are connected through an oil return hole, both sides of the outer wall of the high-temperature oil chamber are provided with return flow grooves, and the interior of the upper box body is provided with an arc-shaped heat dissipation oil channel, and the top of the buffer oil chamber is also provided with an oil-slinging groove connected to the arc-shaped heat dissipation oil channel, a second oil-slinging plate is provided on the outer wall of the transmission shaft and located in the internal fixed sleeve of the buffer oil chamber, and both sides of the top of the lower box body are respectively provided with oil guide grooves connected to the two ends of the arc-shaped heat dissipation oil channel, and the lubricating oil after preliminary cooling by the lubricating oil preliminary cooling component is then secondary cooled through two lubricating oil processing mechanisms; The centrifugal fan air-cooled bearing box structure also includes a turbulent fan, which is fixedly sleeved on the outer wall of the transmission shaft and is used to disturb the air around the lubricating oil processing mechanism to accelerate the heat exchange speed between the lubricating oil processing mechanism and the air; Two lubricating oil processing mechanisms are respectively arranged on both sides of the outer wall of the lower box body. The lubricating oil processing mechanisms are used to connect the oil guide groove and the low-temperature oil cavity on the same side. The heat dissipation per unit time can be adjusted according to the use environment, and the lubricating oil is filtered in multiple stages while cooling the lubricating oil to remove metal impurities of different particle sizes in the lubricating oil. The lubricating oil processing mechanism comprises an upper vertical plate and a lower vertical plate which are detachably arranged at upper and lower relative positions on the same side of the outer wall of the lower box body, a plurality of cross-shaped slide grooves 1 are evenly arranged on the outer wall of the upper vertical plate, an oil discharge through hole connected to the oil guide groove is arranged at the middle position of each cross-shaped slide groove 1, and a plurality of screw rods corresponding to the positions of the cross-shaped slide grooves 1 are evenly arranged on the top of the upper vertical plate, and each screw rod thread penetrates the upper vertical plate and extends to the outside; The outer wall of the lower vertical plate is evenly provided with cross-shaped slide grooves 2 corresponding to the positions of the multiple cross-shaped slide grooves 1. Each cross-shaped slide groove 2 is provided with an oil inlet hole connected to the reflux groove. The cross-shaped slide grooves 1 and 2 at relative positions are jointly provided with a lubricating oil processing component. The bottom end of the screw is rotatably arranged on the top of the lubricating oil processing component at the corresponding position.

2. The air-cooled bearing box structure of a centrifugal fan according to claim 1, characterized in that: The lubricating oil processing component includes a heat exchange tube and a plurality of heat dissipation fins uniformly and fixedly arranged on the outer wall thereof. The outer wall of the heat exchange tube is provided with a take-in and take-out port, and a multi-stage purification unit for filtering the lubricating oil is detachably arranged inside the heat exchange tube. The multi-stage purification unit can be removed from the heat exchange tube through the take-in and take-out port, and a first slider and a second slider are fixedly sleeved on both ends of the heat exchange tube respectively.

3. The air-cooled bearing box structure of a centrifugal fan according to claim 2, characterized in that: The multi-stage purification unit includes a purification cylinder sealed and slidably arranged inside the heat exchange tube and a supporting column fixedly arranged at the center position of the bottom of the inner cavity of the purification cylinder, a lifting groove is opened inside the supporting column, and a partition is fixedly arranged on the lifting groove and the opposite side walls of the purification cylinder, a plurality of No. 1 limiting sleeves are evenly fixedly arranged on the inner wall of the purification cylinder, and a No. 2 limiting sleeve corresponding to the positions of the plurality of No. 1 limiting sleeves is fixedly arranged on the outer wall of the supporting column, and a primary filter plate, a secondary filter plate and a tertiary filter plate are detachably arranged in the No. 1 limiting sleeves and the No. 2 limiting sleeves at the plurality of relative positions, respectively, and the inner diameters of the filter holes of the primary filter plate, the secondary filter plate and the tertiary filter plate decrease successively.

4. The air-cooled bearing box structure of a centrifugal fan according to claim 3, characterized in that: The primary filter plate, secondary filter plate, tertiary filter plate and partition respectively divide the internal space of the purification cylinder into four spaces, namely, a primary filter chamber, a secondary filter chamber, a tertiary filter chamber and an output buffer chamber. A discharge port is provided at the bottom of the inner cavity of the purification cylinder and between the tertiary filter plate and the partition. A drainage pipe 1 is fixedly provided at the bottom of the purification cylinder, and a cleaning component for simultaneously scrubbing the outer walls of the primary filter plate, the secondary filter plate and the tertiary filter plate is also provided inside the purification cylinder.

5. The air-cooled bearing box structure of a centrifugal fan according to claim 4, characterized in that: The cleaning component includes a lifting main rod that slides through the lifting slot, a pressure plate is fixedly arranged at the bottom end of the lifting main rod and below the drainage pipe, a plurality of transverse support plates are also fixedly arranged at the top of the lifting main rod, a lifting sub-rod is fixedly arranged at the bottom of each of the transverse support plates, a plurality of brush plates are evenly fixedly arranged on the outer wall of the lifting sub-rod, and a spring retaining ring is arranged on the outer wall of the lifting main rod and inside the lifting slot, a spring is slidably sleeved on the outer wall of the lifting main rod and below the spring retaining ring, and a spring limit block is fixedly arranged on the inner wall of the lifting slot and at the bottom of the spring.

6. The air-cooled bearing box structure of a centrifugal fan according to claim 5, characterized in that: The top of the purification cylinder is detachably provided with a sealing cover plate and a filtering through hole opened on the top of the sealing cover plate and opposite to the primary filtering cavity area. The sealing cover plate is fixedly provided in the filtering through hole, and a pull ring is fixedly provided on the top of the sealing cover plate through a pull rod.

7. A centrifugal fan transmission assembly, comprising a coupling for connecting a fan and a motor, the coupling completing synchronous rotation between the motor and the fan rotor by transmitting torque, characterized in that: It also includes the centrifugal fan air-cooled bearing box structure as described in any one of claims 1-6.

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