Turbo blower and high speed rotating body used in same

Abstract

The present invention relates to a turbo blower and a high speed rotation body used in the turbo blower. The turbo blower includes: i) a motor having a motor shaft; ii) a gear housing accommodating a bull gear fitted on the motor shaft and a pinion gear engaged with the bull gear; iii) a high speed rotation body that includes a rotary shaft having the pinion gear on the external circumferential surface, an impeller fitted on one end of the rotary shaft, and a rotation body housing accommodating the rotary shaft, the pinion gear, and at least one first composite bearing and partially cut off to expose the pinion gear, and is partially accommodated in the gear housing; and iv) a scroll portion covering the impeller and discharging compressed air.

1 . A turbo blower comprising:
 a motor having a motor shaft;   a gear housing accommodating a bull gear fitted on the motor shaft and a pinion gear engaged with the bull gear;   a high speed rotation body that includes a rotary shaft having the pinion gear on the external circumferential surface, an impeller fitted on one end of the rotary shaft, and a rotation body housing accommodating the rotary shaft, the pinion gear, and at least one first composite bearing and partially cut off to expose the pinion gear, and is partially accommodated in the gear housing; and   a scroll portion covering the impeller and discharging compressed air.   
     
     
         2 . The turbo blower of  claim 1 , wherein:
 the first composite bearing includes:   a composite bearing block integrally having a sliding bearing block and a ball bearing block;   a sliding bearing shaft formed on the external circumferential surface of the rotary shaft and accommodated in the sliding bearing block to form a sliding bearing together with the sliding bearing block; and   a ball bearing accommodated in the ball bearing block.   
     
     
         3 . The turbo blower of  claim 2 , wherein:
 the first composite bearing is positioned at both sides of the pinion gear and a predetermined gap of the sliding bearing is larger than a predetermined gap of the ball bearing.   
     
     
         4 . The turbo bearing of  claim 3 , wherein:
 the sliding bearing shaft has a plurality of oil grooves for forming an oil film on the surface and a plurality of taper grooves which are formed at an angle, and the sliding bearing block has a side pressure-absorbing groove at the portion facing the bull gear, in the inner surface and absorbs side pressure due to the bull gear.   
     
     
         5 . The turbo blower of  claim 4 , wherein:
 the high speed rotation body has a vent hole formed at the end of the rotation body housing which faces the impeller, the pinion gear is formed in a helical gear shape, and the direction of the helical gear is determined such that a force attracting the rotary shaft in opposite direction to the impeller when the rotary shaft rotates.   
     
     
         6 . The turbo blower of  claim 1 , wherein:
 the gear housing has an arc-shaped guide cover having a plurality of oil guide grooves on the inner surface while covering a portion of the bull gear, and an oil box connected with the end of the guide cover at the upper portion therein.   
     
     
         7 . The turbo blower of  claim 6 , wherein:
 the gear housing has an oil pipe therein to supply lubricant collecting in the oil box to the first composite bearing, one end of the oil pipe is connected with an oil outlet formed in the oil box, and the other end of the oil pipe is connected with an oil inlet formed in the first composite bearing.   
     
     
         8 . The turbo blower of  claim 7 , wherein:
 the rotation body housing has a vapor outlet for discharging oil vapor, the turbo blower further includes an oil vapor cooler connected with the vapor outlet and the oil box, and the oil vapor cooler supplies the oil vapor discharged to the vapor outlet to the oil box after condensing the oil vapor.   
     
     
         9 . The turbo blower of  claim 8 , wherein:
 the gear housing has an oil reservoir at the lower portion, the oil reservoir has a pair of holes at the upper and lower portion of the side wall, and the gear housing further includes a connection pipe connecting the pair of holes and a control valve disposed in the connecting pipe.   
     
     
         10 . The turbo blower of  claim 6 , wherein:
 the bull gear is directly fitted on the motor shaft, the gear housing has a combining surface with an opening larger than the diameter of the bull gear, at the side facing the motor, and the combining surface is combined with the motor.   
     
     
         11 . (canceled) 
     
     
         12 . A high speed rotation body comprising:
 a rotary shaft having a pinion gear engaged with a bull gear, on the external circumferential surface;   an impeller fitted on one end of the rotary shaft;   a pair of first composite bearings disposed at both sides of the pinion gear; and   a rotation body housing accommodating the rotary shaft, the pinion gear, and the pair of first composite bearings, and partially cut off to expose the pinion gear.   
     
     
         13 . The high speed rotation body of  claim 12 , wherein:
 each of the pair of first composite bearings includes:   a composite bearing block integrally having a sliding bearing block and a ball bearing block;   a sliding bearing shaft formed on the external circumferential surface of the rotary shaft and accommodated in the sliding bearing block to form a sliding bearing together with the sliding bearing block; and   a ball bearing accommodated in the ball bearing block.   
     
     
         14 . The high speed rotation body of  claim 13 , wherein:
 a predetermined gap of the sliding bearing is larger than a predetermined gap of the ball bearing, the sliding bearing shaft has a plurality of oil grooves for forming an oil film on the surface and a plurality of taper grooves which are formed at an angle, and the sliding bearing block has a side pressure-absorbing groove formed in the opposite direction to the direction of side pressure in order to absorb the side pressure due to the bull gear, on the inner surface.   
     
     
         15 . A turbo blower comprising:
 a motor having a motor shaft;   a bull gear detachably fitted on the motor shaft and having a hole for mounting a fixing shaft at the center;   a second composite bearing disposed between the fixing shaft and the bull gear and having a taper roller bearing and a ball bearing that are parallel with the motor shaft; and   a high speed rotation body having a rotary shaft with a pinion gear engaged with the bull gear, on the external circumferential surface, and an impeller fitted on one end of the rotary shaft.   
     
     
         16 . The turbo blower of  claim 15 , further comprising:
 a motor cover fastened to the motor and supporting the motor shaft; and   a gear housing accommodating the bull gear and the pinion gear and having an opening having a diameter larger than the diameter of the bull gear, at the side fastened to the motor cover.   
     
     
         17 . The turbo blower of  claim 16 , wherein:
 the motor shaft has a flange on the external circumferential surface of the end facing the bull gear, the bull gear is fastened to the motor shaft by a plurality of bolts passing through the bull gear and the flange, and the gear housing has an opening at the portion facing any one bolt in the plurality of bolts.   
     
     
         18 . The turbo blower of  claim 16 , wherein:
 the motor cover has a recess protruding toward the motor to accommodate a portion of the high speed rotation body in the recess.   
     
     
         19 . The turbo blower of  claim 16 , wherein:
 the high speed rotation body further includes:   a pair of first composite bearing disposed at both sides of the pinion gear; and   a rotation body housing accommodating the rotary shaft and the pair of first composite bearing, assembled with the gear housing, and partially cut off to expose the pinion gear in the gear housing.   
     
     
         20 . The turbo blower of  claim 19 , wherein:
 each of the first composite bearings includes:   a composite bearing block integrally having a sliding bearing block and a ball bearing block;   a sliding bearing shaft formed on the external circumferential surface of the rotary shaft and accommodated in the sliding bearing block to form a sliding bearing together with the sliding bearing block; and   a ball bearing accommodated in the ball bearing block.   
     
     
         21 . The turbo blower of  claim 20 , wherein:
 a predetermined gap of the sliding bearing is larger than a predetermined gap of the ball bearing and the sliding bearing shaft has a plurality of oil grooves for forming an oil film on the surface and a plurality of taper grooves which are formed at an angle.   
     
     
         22 . The turbo blower of  claim 19 , wherein:
 the gear housing has an arc-shaped guide cover covering a portion of the bull gear, on the inner surface, and a stepped protrusion positioned on the outer surface of the side of the bull gear, and the protrusion forms a temporary reservoir in an assembly of the gear housing and the motor cover.   
     
     
         23 . The turbo blower of  claim 22 , wherein:
 the guide cover has a plurality of oil guide grooves connected long in the rotation direction of the bull gear, on the inner surface.   
     
     
         24 . The turbo blower of  claim 22 , wherein:
 the gear housing further includes a first through-hole at the portion where the temporary reservoir is formed and a first oil pipe connecting the first through-bole with the fixing shaft at the outside of the gear housing.   
     
     
         25 . The turbo blower of  claim 24 , wherein:
 the fixing shaft is fastened to the gear housing, the fixing shaft has an oil holes therein, and an oil channel is formed between the fixing shaft and the motor shaft, such that lubricant supplied to the oil hole is guided to the second composite bearing.   
     
     
         26 . The turbo blower of  claim 22 , wherein:
 the protrusion has a second through-hole at the lower end, the gear housing has a third through-hole at the joint with the rotary shaft housing, and a second oil pipe connecting the first through-hole with the third through-hole in the gear housing is further included.   
     
     
         27 . The turbo blower of  claim 26 , wherein:
 the rotation body housing has an oil channel connecting the first composite bearing at the impeller in the pair of first composite bearing with the third through-hole, and further includes a third oil pipe connecting the first composite bearing at the opposite side of the impeller in the pair of first composite bearing with the oil channel at the outside thereof.   
     
     
         28 . The turbo blower of  claim 27 , wherein:
 the high speed rotation body further includes a support body disposed between the first composite bearing at the impeller and the impeller, the support body and the rotation body housing form an oil outlet, and the rotation body housing further includes a fourth oil pipe connecting the oil outlet with the gear housing at the outside to collect the lubricant.   
     
     
         29 . The turbo blower of  claim 25 , further comprising:
 a bearing and a sealing member that are disposed in parallel away from the bull gear, on the external circumferential surface of the motor shaft; and   a fifth oil pipe connecting the sealing member with the inside of the motor cover to collect lubricant reaching the sealing member.   
     
     
         30 . A turbo blower comprising:
 a motor having a motor shaft and assembled with a motor cover;   a bull gear detachably fitted on the motor shaft and having a hole for mounting a fixing shaft at the center;   a high speed rotation body including a rotary shaft having a pinion gear engaged with the bull gear, on the external circumferential surface, an impeller fitted on one end of the rotary shaft, at least one first composite bearing supporting the rotary shaft, and a rotation body housing accommodating the rotary shat and the first composite bearing and partially cut off to expose the pinion gear;   a second composite bearing disposed between the fixing shaft and the bull gear and having a taper roller bearing and a ball bearing that are parallel with the motor shaft;   a gear housing accommodating the bull gear and the pinion gear and having an opening having a diameter larger than the diameter of the bull gear, at the side fastened to the motor cover; and   a scroll portion covering the impeller and discharging compressed air.