CN213574777U

CN213574777U - Main shaft structure of fan

Info

Publication number: CN213574777U
Application number: CN202022763656.2U
Authority: CN
Inventors: 熊嫦升
Original assignee: Guangzhou Xinfeng Fan Co ltd
Current assignee: Guangzhou Xinfeng Fan Co ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-06-29
Anticipated expiration: 2030-11-24

Abstract

The invention discloses a main shaft structure of a fan, comprising: a main shaft and a bearing seat; the bearing seat is an integrated bearing seat; the main shaft comprises a middle section and a first stage, a second stage and a third stage which are sequentially reduced in diameter from the middle section to two ends and are connected, so that the main shaft is in a step shape, the main shaft penetrates through the bearing seat, and part of the middle section, the first step section and the second stage is positioned in the bearing seat; the part of the second step section, which is positioned in the bearing seat, is sleeved with a first sealing structure for sealing between the main shaft of the fan and the bearing seat, and the smooth finish of the outer surface, which is in contact with the first sealing structure in the second step section, is mirror finish. The integral bearing seat increases the structural strength and stability of the bearing and the main shaft during operation, and reduces the vibration value of the fan during use; the first sealing structure realizes sealing between the main shaft and the bearing seat and prevents the leakage of the bearing seat.

Description

Main shaft structure of fan

Technical Field

The invention relates to a main shaft structure of a fan.

Background

The main shaft of the fan is an indispensable transmission component for the running of the fan and plays a vital role in the running process of the fan. The existing fan usually adopts a split type bearing seat, when the fan operates, large vibration can be generated, the working operation vibration value is larger than 4.0MM/S, in addition, oil in the bearing seat can often leak outwards along a main shaft of the fan, so that waste is caused, the increased operation cost is reduced, and the potential safety hazard is also increased.

Disclosure of Invention

According to an aspect of the present invention, there is provided a main shaft structure of a wind turbine, including: a main shaft and a bearing seat; the bearing seat is an integrated bearing seat; the main shaft comprises a middle section and a first stage, a second stage and a third stage which are sequentially reduced in diameter from the middle section to two ends and are connected, so that the main shaft is in a step shape, the main shaft penetrates through the bearing seat, and part of the middle section, the first step section and the second stage is positioned in the bearing seat; the part of the second step section, which is positioned in the bearing seat, is sleeved with a first sealing structure for sealing between the main shaft of the fan and the bearing seat, and the smooth finish of the outer surface, which is in contact with the first sealing structure in the second step section, is mirror finish. The integral bearing seat increases the structural strength and stability of the bearing and the main shaft during operation, and reduces the vibration value of the fan during use; the first sealing structure realizes sealing between the main shaft and the bearing seat and prevents the leakage of the bearing seat.

In some embodiments, two bearings are axially spaced apart in the bearing seat, and end caps are provided at both ends of the bearing seat.

In some embodiments, the third stage of the first end of the spindle is coupled to the impeller of the fan and the third stage of the second end of the spindle is coupled to the drive assembly of the fan.

In some embodiments, the bearing is sleeved outside the first step section, and the axial width of the first step section is matched with the axial width of the bearing.

In some embodiments, a portion of the second stepped section located within the bearing housing is provided with an oil slinger which is in contact with the first stepped section for preventing outflow of cooling oil within the bearing housing. Further prevent the cooling oil leakage in the bearing frame, practice thrift the cost.

In some embodiments, the material of the slinger is an oil resistant rubber.

In some embodiments, the first seal structure comprises a first oil seal and a second oil seal, the first oil seal and the second oil seal being spaced apart between the oil slinger and the end cap; the first oil seal and the second oil seal comprise polytetrafluoroethylene sealing bodies and frameworks. The polytetrafluoroethylene material is high temperature resistant, corrosion resistant, and good in sealing performance and chemical stability.

In some embodiments, a second sealing structure for sealing between the main shaft of the fan and the mounting base of the fan is sleeved at the joint of the second stage and the mounting vertical plate of the mounting base of the fan, so that gas leakage is blocked.

In some embodiments, the bearing housing is an oil-cooled integrated bearing housing or a water-cooled integrated bearing housing. The temperature of the main shaft and the bearing is reduced when the fan runs, and the service life is prolonged.

Drawings

FIG. 1 is a front view of a plug-in centrifugal fan according to some embodiments of the present invention;

FIG. 2 is a side view of a plug-in centrifugal fan according to some embodiments of the present invention;

FIG. 3 is a view of the internal structure of a bearing housing of a plug-in centrifugal fan according to some embodiments of the present invention;

FIG. 4 is an enlarged view of the point A in FIG. 3;

FIG. 5 is a side view of a bearing housing of a plug-in centrifugal fan according to some embodiments of the present invention;

FIG. 6 is a schematic view of a spindle configuration for a plug-in centrifugal fan according to some embodiments of the present invention;

fig. 7 is a schematic structural view of a second sealing structure of a plug-in centrifugal fan according to some embodiments of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings, and for convenience of description, the left end in fig. 1 is defined as the front end of the plug-in centrifugal fan, and the right end in fig. 1 is defined as the rear end of the plug-in centrifugal fan.

Fig. 1-7 schematically illustrate a plug-in centrifugal fan according to an embodiment of the invention, comprising: the method comprises the following steps of installing a machine base 100, a driving motor 200, a main shaft 300, a bearing seat 400, a protective cover 500, a transmission assembly, a volute 600, an impeller 700, a heat insulation layer 800 and a sealing assembly;

as shown in fig. 1 and 2, the mounting base 100 is provided with a mounting vertical plate 110 and a motor mounting bracket 120, the mounting vertical plate 110 is arranged at the front end of the mounting base 100, the motor mounting bracket 120 is arranged at the top of the mounting base 100, and the motor mounting bracket 120 is fixed at the top of the mounting base 100 through bolts.

As shown in fig. 1 and 2, the protective cover 500 is disposed at the rear end of the mounting base 100, a transmission assembly is disposed in the protective cover 500, and the protective cover 500 is made of a transparent material, so that the operation condition of the transmission assembly disposed in the protective cover 500 can be observed conveniently.

As shown in fig. 1, the transmission assembly is disposed inside the protective cover 500, and includes a driving wheel 510, a driven wheel 520 and a transmission belt 530, the driving wheel 510 is disposed on an output shaft of the driving motor 200, the driven wheel 520 is disposed at a second end of the main shaft 300, and the transmission belt 530 is sleeved on the driving wheel 510 and the driven wheel 520, so that the driving wheel 510 drives the driven wheel 520 to rotate through the transmission belt 530.

As shown in fig. 1 and 2, the volute 600 is disposed at the front end of the installation base 100, the side surface of the volute 600 is parallel to the installation vertical plate 110, the volute 600 is provided with an inlet air and an outlet 620, and the volute 600 is internally provided with an impeller 700; the air inlet 610 is disposed at a middle portion of a side of the scroll 600 far from the mounting base 100, and the air inlet 610 is a venturi-shaped air inlet 610, thereby reducing pressure loss of the incoming air.

As shown in fig. 1, 2, 3, 4, bearing seat 400 is fixedly installed in the middle of installation base 100 through bolts, end covers 420 are arranged at two ends of bearing seat 400, a plurality of fixing holes are uniformly distributed on end covers 420, thereby fixing end covers 420 at two ends of bearing seat 400 through bolts passing through the fixing holes and the screw holes formed in bearing seat 400, bearing seat 400 is an integrated oil-cooled bearing seat 400, two bearings 410 are arranged in bearing seat 400 at intervals along the axial direction, bearings 410 are sleeved outside main shaft 300, a certain amount of cooling oil is filled in bearing seat 400, the temperature of bearings 410 and main shaft 300 is reduced when oil-cooled bearing seat 400 is operated, the service life of bearings 410 is prolonged, and screw-in oil pointer 440 is arranged on the side surface of bearing seat. Integral type bearing frame 400 has increased structural strength and stability when bearing 410 and main shaft 300 move, and vibration numerical value when having reduced the use of fan adopts integral type bearing frame 400 to strengthen main shaft 300 and bearing 410's fit clearance, changes the critical rotational speed structural strength of main shaft 300. In some other embodiments, the integrated oil-cooled bearing housing 400 can be replaced with an integrated water-cooled bearing housing 400, with the cooling medium within the bearing housing 400 being cooling water.

As shown in fig. 1, 3, 5, 6, and 7, the main shaft 300 penetrates through the bearing seat 400 and the mounting base 100, the main shaft 300 is a stepped shaft, and includes an intermediate section 340, and a first stage 310, a second stage 320, and a third stage 330, which are sequentially reduced in diameter from the intermediate section 340 to both ends and are connected to each other, a portion of the intermediate section 340, the first stage 310, and the second stage 320 is located in the bearing seat 400, the third stage 330 at the first end of the main shaft 300 extends into the volute 600 to be connected to the impeller 700, and the third stage 330 at the second end of the main shaft 300 extends into the shield 500 to be connected to the driven wheel 520, so that the main shaft 300 rotates along with the driven wheel 520. The bearing 410 is sleeved outside the first stage 310, and the axial width of the first stage 310 is matched with the axial width of the bearing 410. The oil slinger 430 is sleeved on a portion of the second stage 320 located in the bearing housing 400, the oil slinger 430 is in contact with the first stage 310 for preventing cooling oil from flowing out, and the oil slinger 430 is made of oil-resistant rubber. The second stage 320 is provided with a first sealing structure 910 on a portion inside the bearing housing 400, the first sealing structure 910 is used for sealing between the bearing housing 400 and the main shaft 300 to prevent leakage of cooling oil inside the bearing housing 400, and the finish of the outer surface of the second stage contacting with the first sealing structure is a mirror finish. The second sealing structure 900 is sleeved at the joint of the second stage 320 and the mounting vertical plate 110, and the second sealing structure 900 is used for sealing between the mounting base 100 and the spindle 300 to prevent gas in the volute 600 from leaking.

And a sealing assembly including a first sealing structure 910 and a second sealing structure 900, the first sealing structure 910 being used for sealing between the main shaft 300 and the bearing housing 400 to prevent leakage of cooling oil in the bearing housing 400, and the second sealing structure 900 being used for sealing between the main shaft 300 and the mounting base 100 to block leakage of gas in the scroll 600.

As shown in fig. 3 and 4, a first sealing structure 910 is sleeved on a portion of the second stage 320 located in the bearing housing 400, the first sealing structure includes a first oil seal and a second oil seal, the first oil seal and the second oil seal are arranged at intervals between the oil retainer ring and the end cover, and the first oil seal and the second oil seal include a polytetrafluoroethylene sealing main body and a polytetrafluoroethylene framework. The first oil seal and the second oil seal are made of polytetrafluoroethylene, high temperature resistance, corrosion resistance, good sealing performance and chemical stability are achieved, the framework plays a role in strengthening, and the sealing main body can keep the shape and the tension. The first sealing structure 910 is matched with the second stage 320 of the spindle 300 in a gapless self-locking adjustment loss compensation manner, so that liquid leakage of cooling oil under limited space pressure is effectively prevented, the cooling oil in the bearing seat 400 is prevented from leaking along the spindle 300, and the cost is saved.

As shown in fig. 1 and 7, the second sealing structure 900 is sleeved outside the second stage 320 and fixed inside the mounting vertical plate 110. The second sealing structure 900 includes a sealing film 901, a first limiting plate, a first pressing plate 903, a second limiting plate 904 and a second pressing plate 905 sequentially attached from the volute 600 to the direction of the mounting base 100, a first groove is formed in the inner side of the first limiting plate 902, a first sealing ring 906 is arranged in the first groove, a second groove is formed in the inner side of the second limiting plate 904, and a second sealing ring 907 is arranged in the second groove. First sealing washer 906 is the skeleton sealing washer, and first sealing washer 906 includes that the material is polytetrafluoroethylene's sealed main part and skeleton, and polytetrafluoroethylene's sealed main part is high temperature resistant, and is corrosion-resistant, and leakproofness, chemical stability are good, and the skeleton plays the additional strengthening, makes first sealing washer 906 can keep shape and tension. The second sealing ring 907 is a carbon fiber sealing ring, and the carbon fiber material has good thermal conductivity, wear resistance and chemical stability, and is high in mechanical strength and long in service life. The axial width of first limiting plate 902 and the axial width looks adaptation of first sealing washer 906 compress tightly first sealing washer 906 and make first sealing washer 906 and main shaft 300 interference fit, radially exert pressure to first sealing washer 906, improve first sealing washer 906's sealing capacity. The axial width of the second limiting plate 904 is matched with the axial width of the second sealing ring 907, the second sealing ring 907 is pressed tightly, so that the second sealing ring 907 is in interference fit with the spindle 300, pressure is applied to the second sealing ring 907 in the radial direction, and the sealing capacity of the second sealing ring 907 is improved. The outer side surfaces of the sealing rubber sheet 901, the first limiting plate 902, the first pressing plate 903, the second limiting plate 904 and the second pressing plate 905 are flush. The sealing rubber sheet 901, the first limiting plate 902, the first pressing plate 903, the second limiting plate 904 and the second pressing plate 905 are provided with at least one coaxial through hole 908, the axis of the coaxial through hole 908 is parallel to the axis of the spindle 300, and a bolt passes through the coaxial through hole 908 and a screw hole formed in the end cover 420 or the mounting vertical plate 110 so as to force and fix the sealing rubber sheet 901, the first limiting plate 902, the first pressing plate 903, the second limiting plate 904 and the second pressing plate 905 on the inner side of the end cover 420 or the inner side of the mounting vertical plate 110. The five-layer sealing structure is forced and fixed through the bolts, and the five-layer sealing structure is forced and fixed axially, so that the sealing performance is improved; in addition, after the second sealing structure 900 is sealed for a period of time, the situation that the sealing performance is reduced may occur, at this time, the bolts may be adjusted to further tighten the five-layer sealing structure, so that the sealing performance of the five-layer sealing structure is increased under a larger pressure, the service life of the second sealing structure 900 is prolonged, the replacement is reduced, and the cost is saved. The sealing film 901 is made of polytetrafluoroethylene, is high temperature resistant, corrosion resistant, and has good sealing property and chemical stability, and the service life of the second sealing structure 900 in a specific chemical environment is prolonged. The sealing structures which are mutually prevented from gas leakage and have the five-layer mosaic structure of the second sealing structure 900 respectively and independently prevent gas leakage in different forms, and the seamless gapless wear-resistant second sealing structure 900 blocks 99.5 percent of gas leakage.

As shown in fig. 1 and 2, the driving motor 200 is mounted on the motor mounting bracket 120 on the mounting base 100 and fixed to the motor mounting bracket 120 by bolts, and the driving motor 200 is configured to drive the main shaft 300 to rotate by the transmission assembly, so as to drive the impeller 700 to rotate.

As shown in fig. 1, a heat insulation layer 800 wrapped on the outer side of the spindle 300 is disposed between the mounting vertical plate 110 and the volute 600, and is used for preventing heat from being transferred outward, so that the heat is prevented from being transferred to the driving motor 200, and the service life of the driving motor 200 is prevented from being affected.

The foregoing are only some embodiments of the invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims

1. The main shaft structure of the fan is characterized by comprising a main shaft and a bearing seat;

the bearing seat is an integrated bearing seat;

the main shaft comprises a middle section and a first stage, a second stage and a third stage which are sequentially reduced in diameter from the middle section to two ends and are connected, so that the main shaft is in a step shape, the main shaft penetrates through the bearing seat, and part of the middle section, the first step section and the second stage are positioned in the bearing seat; the second step section is positioned on one part in the bearing seat and sleeved with a first sealing structure for sealing between the main shaft of the fan and the bearing seat, and the smooth finish of the outer surface of the second step section, which is in contact with the first sealing structure, is mirror finish.

2. The main shaft structure of the blower according to claim 1, wherein two bearings are axially arranged in the bearing seat at intervals, and end caps are arranged at two ends of the bearing seat.

3. The fan spindle structure of claim 2, wherein the third stage of the first end of the spindle is connected to an impeller of the fan, and the third stage of the second end of the spindle is connected to a transmission assembly of the fan.

4. The main shaft structure of the blower according to claim 3, wherein the bearing is sleeved outside the first step section, and the axial width of the first step section is adapted to the axial width of the bearing.

5. The main shaft structure of a blower according to claim 4, wherein a portion of the second step section located in the bearing housing is provided with an oil slinger which is in contact with the first step section for preventing outflow of cooling oil in the bearing housing.

6. The main shaft structure of the fan as claimed in claim 5, wherein the oil slinger is made of oil-resistant rubber.

7. The main shaft structure of a blower according to claim 6, wherein the first sealing structure includes a first oil seal and a second oil seal, the first oil seal and the second oil seal being disposed at a distance between the oil slinger and the end cover; the first oil seal and the second oil seal comprise polytetrafluoroethylene sealing bodies and frameworks.

8. The main shaft structure of the blower according to claim 7, wherein a second sealing structure for sealing between the main shaft of the blower and the mounting base of the blower is sleeved at a joint of the second stage and the mounting vertical plate of the mounting base of the blower.

9. The main shaft structure of the blower according to claim 8, wherein the bearing housing is an oil-cooled integrated bearing housing or a water-cooled integrated bearing housing.