Patent Publication Number: US-2022233042-A1

Title: Dust collector

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of priority to Japanese Patent Application No. 2021-008966, filed on Jan. 22, 2021, the entire contents of which are hereby incorporated by reference. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a dust collector. 
     2. Description of the Background 
     A known electric vacuum cleaner in the field of dust collectors includes an electric motor (motor), as described in Japanese Unexamined Patent Application Publication No. 52-006573. 
     BRIEF SUMMARY 
     Motors generate heat and are to be cooled. 
     One or more aspects of the present disclosure are directed to cooling a motor. 
     A first aspect of the present disclosure provides a dust collector, including: 
     a body housing; 
     a motor located inside the body housing; 
     a cooling fan rotatable by the motor to feed a gas to around the motor and to discharge the gas from around the motor; and 
     a support including a channel through which the gas is flown by the cooling fan, the support supporting the motor. 
     The structure according to the above aspect of the present disclosure allows the motor to be cooled. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view of a dust collector according to an embodiment. 
         FIG. 2  is a rear view of the dust collector according to the embodiment. 
         FIG. 3  is a left side view of the dust collector according to the embodiment. 
         FIG. 4  is a right side view of the dust collector according to the embodiment. 
         FIG. 5  is a rear view of the dust collector according to the embodiment without a rear housing and a dust box cover. 
         FIG. 6  is a perspective view of the dust collector according to the embodiment without the rear housing and the dust box cover as viewed from the left rear. 
         FIG. 7  is a perspective view of the dust collector according to the embodiment without the rear housing and the dust box cover as viewed from the right rear. 
         FIG. 8  is a cross-sectional view of the dust collector according to the embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Although one or more embodiments of the present disclosure will now be described with reference to the drawings, the present disclosure is not limited to the present embodiments. The components in the embodiments described below may be combined as appropriate. One or more components may be eliminated. 
     In the embodiments, the positional relationships between the components will be described using the directional terms such as front and rear (or frontward and rearward), up and down (or vertical), and right and left (or lateral). The terms indicate relative positions or directions with respect to the center of a dust collector  1 . 
     Dust Collector 
       FIG. 1  is a perspective view of the dust collector  1  according to an embodiment. The dust collector  1  according to the embodiment is a back-pack dust collector wearable by a user on his or her back for use. The dust collector  1  includes a body housing  2  and a battery mount  3 . 
     The dust collector  1  is wearable on the user&#39;s back. A harness belt  4  is connected to the dust collector  1 . The harness belt  4  is connected to the body housing  2 . The dust collector  1  is wearable on the user&#39;s back with the harness belt  4 . The harness belt  4  includes a shoulder belt  4 A and a waist belt  4 B. The shoulder belt  4 A is put over the user&#39;s shoulder. The waist belt  4 B is put over the user&#39;s waist. 
     The battery mount  3  is located in a lower portion of the body housing  2 . A battery pack  5  is attachable to or detachable from the battery mount  3 . The battery pack  5  serves as a power supply for the dust collector  1 . When mounted on the battery mount  3 , the battery pack  5  powers an electronic device incorporated in the dust collector  1 . The battery pack  5  is a general-purpose battery usable as a power supply for various electrical instruments. The battery pack  5  is usable for powering a power tool. The battery pack  5  is also usable for powering electrical instruments other than power tools. The battery pack  5  is usable for powering dust collectors other than the dust collector  1  according to the embodiment. The battery pack  5  includes a lithium-ion battery. The battery pack  5  includes a rechargeable battery. The battery mount  3  has the same structure as a battery mount included in a power tool. 
       FIG. 2  is a rear view of the dust collector  1  according to the embodiment.  FIG. 3  is a left side view of the dust collector  1  according to the embodiment.  FIG. 4  is a right side view of the dust collector  1  according to the embodiment. 
     The body housing  2  includes a front surface  2 A, a rear surface  2 B, an upper surface  2 C, a lower surface  2 D, a left side surface  2 E, and a right side surface  2 F. The front surface  2 A faces frontward. The rear surface  2 B faces rearward. The upper surface  2 C faces upward. The lower surface  2 D faces downward. The left side surface  2 E faces leftward. The right side surface  2 F faces rightward. When the dust collector  1  is worn on the user&#39;s back, the front surface  2 A faces the user&#39;s back. 
     The body housing  2  has an internal space. The internal space of the body housing  2  accommodates a drive unit  30  including a motor  31 . The body housing  2  in the embodiment is dividable into halves. The body housing  2  includes a front housing  21 , a rear housing  22 , and a dust box cover  23 . The front housing  21  is located frontward from the rear housing  22 . The front housing  21  includes the front surface  2 A, a part of the upper surface  2 C, a part of the lower surface  2 D, a part of the left side surface  2 E, and a part of the right side surface  2 F. The rear housing  22  includes the rear surface  2 B, a part of the upper surface  2 C, a part of the lower surface  2 D, a part of the left side surface  2 E, and a part of the right side surface  2 F. The rear end of the front housing  21  and the front end of the rear housing  22  are joined to each other, defining the internal space of the body housing  2 . The front housing  21  and the rear housing  22  are fastened together with multiple screws. 
     The rear housing  22  has a body opening  24  in its upper portion. The body opening  24  communicates with the internal space of the body housing  2 . The dust box cover  23  covers the body opening  24 . The dust box cover  23  has its lower end coupled to the rear housing  22  in a pivotable manner. The lower end of the dust box cover  23  is hinged to the rear housing  22 . The hinge has its hinge axis extending laterally. The upper end of the dust box cover  23  rotates vertically. The dust box cover  23  pivots to cover and uncover the body opening  24 . 
     A latch  25  is located at the upper end of the rear housing  22 . The latch  25  may be coupled to the upper end of the dust box cover  23 . The latch  25  fastens the dust box cover  23  to the rear housing  22 . The body housing  2  includes the front housing  21  and the rear housing  22  joined to each other, and the dust box cover  23  attached to the rear housing  22 . 
     The battery mount  3  is located in a battery compartment  26 . The battery compartment  26  is located in the lower portion of the body housing  2 . The battery compartment  26  has a recess located in the lower portion of the body housing  2 . The battery compartment  26  is recessed upward from the lower surface  2 D of the body housing  2 . The battery mount  3  is inside the battery compartment  26 . The battery pack  5  mounted on the battery mount  3  is accommodated in the battery compartment  26 . 
     The body housing  2  includes a suction port  6 , outlets  7 , body inlets  8 , and a body outlet  9 . 
     The suction port  6  sucks dust together with gas (air). The suction port  6  is located in the upper surface  2 C of the body housing  2 . The body housing  2  has one suction port  6 . The suction port  6  connects the inside and the outside of the body housing  2 . The suction port  6  is connected to a dust collection hose (not shown). 
     The outlets  7  discharge at least part of the gas sucked through the suction port  6 . The outlets  7  are located in lower portions of the left side surface  2 E and the right side surface  2 F of the body housing  2 . The outlets  7  connect the inside and the outside of the body housing  2 . 
     The body inlets  8  allow gas (air) to be sucked in for cooling the motor  31 . The body inlets  8  are located in the front surface  2 A of the body housing  2 . The body housing  2  has two body inlets  8 . The two body inlets  8  align with each other in the lateral direction. The body inlets  8  connect the inside and the outside of the body housing  2 . 
     The body outlet  9  allows at least part of the gas sucked through the body inlets  8  to be discharged. The body outlet  9  is located in the lower surface  2 D of the body housing  2 . The body outlet  9  connects the inside and the outside of the body housing  2 . 
       FIG. 5  is a rear view of the dust collector  1  according to the embodiment without the rear housing  22  and the dust box cover  23 .  FIG. 6  is a perspective view of the dust collector  1  according to the embodiment without the rear housing  22  and the dust box cover  23  as viewed from the left rear.  FIG. 7  is a perspective view of the dust collector  1  according to the embodiment without the rear housing  22  and the dust box cover  23  as viewed from the right rear.  FIG. 8  is a cross-sectional view of the dust collector  1  according to the embodiment. 
     The body housing  2  includes a dust collection compartment  10 , a motor compartment  11 , and exhaust channels  12  in the internal space. The dust collection compartment  10  is located upward in the internal space of the body housing  2 . The motor compartment  11  is located downward from the dust collection compartment  10  in the internal space of the body housing  2 . The exhaust channels  12  are located rightward and leftward from the motor compartment  11  in the internal space of the body housing  2 . 
     The suction port  6  is connected to the dust collection compartment  10 . The suction port  6  is located in an upper portion of the dust collection compartment  10 . The body opening  24  is connected to the dust collection compartment  10 . The body opening  24  is located in a rear portion of the dust collection compartment  10 . The dust box cover  23  is operable to cover and uncover the dust collection compartment  10 . 
     The outlets  7  are connected to the exhaust channels  12 . The outlets  7  are located below the exhaust channels  12 . The outlets  7  receive sound absorbers  13 . The sound absorbers  13  may be formed from, for example, a porous synthetic resin. 
     The body inlets  8  are connected to the motor compartment  11 . The body inlets  8  are located in the front of the motor compartment  11 . The two body inlets  8  align with each other in the lateral direction in an upper portion of the motor compartment  11 . 
     The body outlet  9  is connected to the motor compartment  11 . The body outlet  9  is located in a lower portion of the motor compartment  11 . The body outlet  9  is adjacent to a lower portion of the battery compartment  26 . 
     The body housing  2  includes partition walls  27 . The partition walls  27  are on the inner surface of the body housing  2 . The partition walls  27  located inside the body housing  2  define at least a part of the dust collection compartment  10 . The dust collection compartment  10  accommodates a dust collection bag  14  as shown in  FIG. 5 . The dust collection bag  14  is connected to the suction port  6 . The dust collection bag  14  may be, for example, a paper bag. The dust collection bag  14  collects dust sucked through the suction port  6 . The user can open the dust box cover  23  and replace the dust collection bag  14  through the body opening  24 . 
     The body housing  2  includes partition walls  28 . The partition walls  28  are on the inner surface of the body housing  2 . The partition walls  28  located inside the body housing  2  define at least a part of the motor compartment  11 . The partition walls  28  separate the motor compartment  11  and the exhaust channels  12  from each other. The motor compartment  11  accommodates the drive unit  30  including the motor  31 , supports  50 , and a controller  15 . 
     The body housing  2  has a partition wall  29 . The partition wall  29  is on the inner surface of the body housing  2 . The dust collection compartment  10  and the motor compartment  11  are separated from each other by the partition wall  29  and a filter  16 . The filter  16  may be, for example, a high-efficiency particulate air (HEPA) filter. The filter  16  is located above the partition wall  29 . The filter  16  is supported on the partition wall  29 . The filter  16  faces the dust collection compartment  10 . 
     The partition wall  29  has an opening  29 M. The opening  29 M connects the dust collection compartment  10  and the motor compartment  11  to each other. The filter  16  covers the opening  29 M. Gas in the dust collection compartment  10  flows into the motor compartment  11  through the opening  29 M. 
     The drive unit  30  includes the motor  31 , a blowing fan  32 , a cooling fan  33 , a motor housing  34 , a fan base  35 , a fan cover  36 , a mesh cover  37 , and a support ring  38 . 
     The motor  31  is accommodated in the body housing  2 . The motor  31  is accommodated in the motor housing  34  inside the motor compartment  11 . The motor  31  is a brushless inner-rotor motor. The motor  31  generates power for rotating the blowing fan  32  and the cooling fan  33 . The motor  31  includes a stator  39 , a rotor  40 , and a rotor shaft  41 . The rotor  40  is located inside the stator  39 . The rotor shaft  41  is fixed to the rotor  40 . The rotor shaft  41  extends vertically. The rotor shaft  41  is rotatably supported by bearings  42  and  43 . The bearing  42  rotatably supports an upper portion of the rotor shaft  41 . The bearing  43  rotatably supports a lower portion of the rotor shaft  41 . The rotor shaft  41  has its rotation axis extending vertically. 
     The blowing fan  32  is rotated by the motor  31 . The blowing fan  32  is fixed to the upper portion of the rotor shaft  41 . The blowing fan  32  faces the opening  29 M. The blowing fan  32  is located upward from the bearing  42 . As the rotor shaft  41  rotates, the blowing fan  32  rotates. The blowing fan  32  generates a suction force at the suction port  6 . The blowing fan  32  is rotated by the motor  31  to generate a suction force at the suction port  6 . 
     The cooling fan  33  is rotated by the motor  31 . The cooling fan  33  is fixed to the lower portion of the rotor shaft  41 . The cooling fan  33  is located upward from the bearing  43 . The cooling fan  33  is located downward from the stator  39 . As the rotor shaft  41  rotates, the cooling fan  33  rotates. The cooling fan  33  generates a gas flow for cooling the motor  31 . The cooling fan  33  rotates to flow gas around the motor  31 . The cooling fan  33  is rotated by the motor  31  to feed gas to around the motor  31  and to discharge gas from around the motor  31 . 
     The cooling fan  33  generates a suction force at the body inlets  8 . The cooling fan  33  is rotated by the motor  31  to generate a suction force at the body inlets  8 . 
     The blowing fan  32  and the cooling fan  33  are centrifugal fans. The blowing fan  32  has a larger outer diameter than the cooling fan  33 . The blowing fan  32  is located outside and upward from the motor housing  34 . The cooling fan  33  is accommodated in the motor housing  34  inside the motor compartment  11 . 
     The motor housing  34  accommodates the motor  31  and the cooling fan  33  inside the body housing  2 . The motor  31  and the cooling fan  33  are located in the internal space of the motor housing  34 . The motor housing  34  supports the motor  31 . The motor housing  34  supports both the bearings  42  and  43 . The motor housing  34  is at least partially cylindrical. 
     The motor housing  34  has motor inlets  44  and motor outlets  45 . The motor inlets  44  connect the inside and the outside of the motor housing  34 . The motor outlets  45  connect the inside and the outside of the motor housing  34 . The motor inlets  44  are located upward from the motor outlets  45 . The motor inlets  44  are located in upper portions of the side surfaces of the motor housing  34 . The motor outlets  45  are located in lower portions of the side surfaces of the motor housing  34 . The motor housing  34  has the motor inlets  44  in each of its right and left side surfaces. The motor housing  34  has the motor outlets  45  in each of its right and left side surfaces. 
     Gas outside the motor housing  34  flows into the motor housing  34  through the motor inlets  44 . Gas to be fed to around the motor  31  flows through the motor inlets  44 . 
     Gas inside the motor housing  34  flows out of the motor housing  34  through the motor outlets  45 . Gas discharged from around the motor  31  flows through the motor outlets  45 . 
     The fan base  35  supports the motor housing  34 . The fan base  35  at least partially surrounds the side surface of the motor housing  34 . The fan base  35  at least partially faces the upper surface of the motor housing  34 . The fan base  35  and the motor housing  34  are fastened together with a screw  46 . The fan base  35  has openings  47  in each of its right and left side surfaces. The motor inlets  44  and the motor outlets  45  are located inside the opening  47 . 
     The fan cover  36  at least partially covers the blowing fan  32 . The fan cover  36  at least partially surrounds the fan base  35 . The fan cover  36  is at least partially located upward from the fan base  35 . The fan cover  36  is supported by the fan base  35 . The fan cover  36  at least partially surrounds the blowing fan  32 . The fan cover  36  is at least partially located upward from the blowing fan  32 . The fan cover  36  has a fan inlet  48 . The fan inlet  48  is located in an upper portion of the fan cover  36 . The fan inlet  48  faces upward. The fan inlet  48  is located inside the opening  29 M. The fan inlet  48  faces the filter  16 . The fan cover  36  has its upper end facing the filter  16 . 
     The mesh cover  37  is received in the fan inlet  48 . 
     The support ring  38  is supported on the upper surface of the fan cover  36 . The support ring  38  is annular and formed from synthetic rubber, such as nitrile rubber (NBR) or silicone rubber. The support ring  38  is at least partially located between the upper surface of the fan cover  36  and the lower surface of the partition wall  29 . The support ring  38  is at least partially located inside the opening  29 M. The support ring  38  is in tight contact with both the fan cover  36  and the partition wall  29 . The support ring  38  seals the boundary between the fan cover  36  and the partition wall  29 . 
     The supports  50  support the motor  31 . The supports  50  in the embodiment support the motor housing  34 . The supports  50  support the motor  31  with the motor housing  34 . 
     The supports  50  support the sides of the motor housing  34 . The supports  50  also support a lower portion of the motor housing  34 . The supports  50  in the embodiment include a support  51  and a support  52 . The support  51  is located on the left of the motor housing  34 . The support  52  is located on the right of the motor housing  34 . The support  51  at least partially supports a left portion of the motor housing  34 . The support  51  at least partially supports the lower portion of the motor housing  34 . The support  52  at least partially supports a right portion of the motor housing  34 . The support  52  at least partially supports the lower portion of the motor housing  34 . 
     The supports  50  are supported by the body housing  2 . The partition walls  28  include ribs  20 . The ribs  20  protrude from the partition walls  28 . The supports  50  are supported by the ribs  20 . 
     The supports  50  include channels, and gas flown by the cooling fan  33  flows through the channels. The channels are located inside the supports  50 . 
     The channels include intake channels  53  and exhaust channels  54 . Gas to be fed to around the motor  31  flows through the intake channels  53 . Gas discharged from around the motor  31  flows through the exhaust channels  54 . The intake channels  53  and the exhaust channels  54  are both located inside the supports  50 . 
     The intake channels  53  are located upward from the exhaust channels  54 . The intake channels  53  have their inlets adjacent to the body inlets  8 . The supports  50  include partitions  55  for separating the intake channels  53  and the exhaust channels  54  from each other. The partitions  55  are located between the intake channels  53  and the exhaust channels  54 . 
     The supports  50  are at least partially located inside the opening  47  of the fan base  35 . The supports  50  are in contact with at least a part of the motor housing  34 . 
     The intake channels  53  are connected to the motor inlets  44 . Gas to be fed to around the motor  31  flows through the intake channels  53  and the motor inlets  44  and then into the motor housing  34 . 
     The exhaust channels  54  are connected to the motor outlets  45 . Gas discharged from around the motor  31  flows through the motor outlets  45  and the exhaust channels  54  and then flows out of the motor housing  34 . 
     The supports  50  are elastic members. The elastic members are, for example, synthetic rubber. The synthetic rubber is, for example, NBR or silicone rubber. The supports  50  serve as dampers (vibration damping members). The supports  50  reduce transmission of vibrations from the motor  31  to the body housing  2 . 
     The controller  15  includes a computer system. The controller  15  outputs control signals for controlling an electronic device incorporated in the dust collector  1 . The electronic device includes the motor  31 . The controller  15  outputs control signals for controlling the motor  31 . The controller  15  includes a control board on which multiple electronic components are mounted. Examples of the electronic components mounted on the control board include a processor such as a central processing unit (CPU), a nonvolatile memory such as a read-only memory (ROM) or a storage device, a volatile memory such as a random-access memory (RAM), a transistor, a capacitor, and a resistor. 
     The motor  31  runs on power supplied from the battery pack  5 . The controller  15  operates on power supplied from the battery pack  5 . 
     The motor  31  runs to rotate both the blowing fan  32  and the cooling fan  33 . 
     When the blowing fan  32  rotates, a suction force is generated at the suction port  6 . This sucks gas from the suction port  6  to the dust collection compartment  10 . The suction port  6  is connected to the dust collection bag  14 . The dust collection bag  14  collects dust contained in the gas. The gas flows through the dust collection bag  14  and then through the filter  16 . The filter  16  collects fine dust that the dust collection bag  14  has failed to collect. After flowing through the filter  16 , the gas flows through the opening  29 M and the inside of the support ring  38  and then enters the blowing fan  32  through the fan inlet  48 . The mesh cover  37  is received in the fan inlet  48  to reduce foreign matter entering the fan cover  36 . After flowing through the blowing fan  32 , the gas flows through the exhaust channels  12  and is then discharged out of the body housing  2  through the outlets  7 . 
     When the cooling fan  33  rotates, a suction force is generated at the body inlets  8 . The suction force generated at the body inlets  8  sucks gas from the body inlets  8  to the motor compartment  11 , as indicated by arrows Fb in  FIG. 8 . After sucked into the motor compartment  11 , the gas flows through the intake channels  53  and the motor inlets  44  into the motor housing  34  to cool the motor  31 . After cooling the motor  31 , the gas flows through the motor outlets  45  and the exhaust channels  54  and then flows out of the motor housing  34 . The gas is then discharged out of the body housing  2  through the body outlet  9 . 
     In the present embodiment, the supports  50  supporting the motor  31  include channels. The dust collector  1  can thus avoid being upsized. The channels include the intake channels  53 , through which gas to be fed to around the motor  31  flows, and the exhaust channels  54 , through which gas discharged from around the motor  31  flows. When the cooling fan  33  rotates, gas is fed to around the motor  31  through the intake channels  53 . Thus, the motor  31  is cooled effectively. After cooling the motor  31 , the gas is discharged from around the motor  31  through the exhaust channels  54 . 
     The supports  50  are supported by the body housing  2 . In other words, the motor  31  is supported by the body housing  2  with the supports  50 . 
     The dust collector  1  according to the embodiment separately includes the blowing fan  32  for generating a suction force at the suction port  6  and the cooling fan  33  for generating a gas flow for cooling the motor  31 . This allows the blowing fan  32  to generate a strong suction force at the suction port  6 . The cooling fan  33  effectively cools the motor  31 . In addition, for example, when a dust collection hose (not shown) connected to the suction port  6  or the filter  16  is clogged and the blowing fan  32  is unable to generate a gas flow, the motor  31  may still be cooled by the rotation of the cooling fan  33  separate from the blowing fan  32 . 
     The body housing  2  has the body inlets  8 . The cooling fan  33  generates a suction force at the body inlets  8 . Gas sucked from outside the body housing  2  effectively cools the motor  31 . 
     The supports  50  include partitions  55  for separating the intake channels  53  and the exhaust channels  54  from each other. In this structure, gas fed to around the motor  31  and gas discharged from around the motor  31  are less likely to mix with each other. 
     In the embodiment, the motor  31  is supported by the motor housing  34 . The supports  50  support the motor housing  34 . In other words, the supports  50  support the motor  31  with the motor housing  34 . 
     The supports  50  support the sides of the motor housing  34 . The driving motor  31  may vibrate the motor housing  34 . In this case, the sides of the motor housing  34  may vibrate more than a central portion. The supports  50 , which support the sides of the motor housing  34 , reduce the vibration of the motor housing  34 . 
     The supports  50  in the embodiment include the support  51  supporting the left portion of the motor housing  34  and the support  52  supporting the right portion of the motor housing  34 . This effectively reduces the vibration of the motor housing  34 . 
     The supports  50  support the lower portion of the motor housing  34 . In other words, the motor housing  34  is stably supported by the supports  50 . 
     The motor housing  34  has the motor inlets  44  connected to the intake channels  53 . More specifically, gas for cooling the motor  31  flows through the intake channels  53  and the motor inlets  44  and is then fed to around the motor  31 . 
     The motor housing  34  has the motor outlets  45  connected to the exhaust channels  54 . More specifically, after cooling the motor  31 , the gas flows through the motor outlets  45  and the exhaust channels  54  and is then discharged from around the motor  31 . 
     The supports  50  are elastic members. The supports  50  serve as dampers (vibration damping members). The supports  50  reduce transmission of vibrations from the motor  31  to the body housing  2 . When the body housing  2  is in contact with the user&#39;s back, the supports  50  reduce the vibration from the motor  31  transmitted to the user&#39;s back. 
     OTHER EMBODIMENTS 
     In the above embodiment, the supports  50  include both the intake channels  53  and the exhaust channels  54 . In the supports  50 , the intake channels  53  may be included and the exhaust channels  54  may be eliminated. In the supports  50 , the exhaust channels  54  may be included and the intake channels  53  may be eliminated. 
     In the above embodiment, the intake channels  53  are located in the supports  50 . The intake channels  53  may be located, for example, between the supports  50  and at least a part of the body housing  2 . In the same manner, the exhaust channels  54  may be formed, for example, between the supports  50  and at least a part of the body housing  2 . 
     REFERENCE SIGNS LIST 
     
         
           1  dust collector 
           2  body housing 
           2 A front surface 
           2 B rear surface 
           2 C upper surface 
           2 D lower surface 
           2 E left side surface 
           2 F right side surface 
           3  battery mount 
           4  harness belt 
           4 A shoulder belt 
           4 B waist belt 
           5  battery pack 
           6  suction port 
           7  outlet 
           8  body inlet 
           9  body outlet 
           10  dust collection compartment 
           11  motor compartment 
           12  exhaust channel 
           13  sound absorber 
           14  dust collection bag 
           15  controller 
           16  filter 
           20  rib 
           21  front housing 
           22  rear housing 
           23  dust box cover 
           24  body opening 
           25  latch 
           26  battery compartment 
           27  partition wall 
           28  partition wall 
           29  partition wall 
           29 M opening 
           30  drive unit 
           31  motor 
           32  blowing fan 
           33  cooling fan 
           34  motor housing 
           35  fan base 
           36  fan cover 
           37  mesh cover 
           38  support ring 
           39  stator 
           40  rotor 
           41  rotor shaft 
           42  bearing 
           43  bearing 
           44  motor inlet 
           45  motor outlet 
           46  screw 
           47  opening 
           48  fan inlet 
           50  support 
           51  support 
           52  support 
           53  intake channel 
           54  exhaust channel 
           55  partition