JP5989316B2 - Electric blower and vacuum cleaner - Google Patents

Description

  Embodiments according to the present invention relate to an electric blower and a vacuum cleaner.

  2. Description of the Related Art There is known an electric vacuum cleaner including a turbo fan that has a multistage flow path in the direction of a rotation center line by passing an intermediate plate between moving blades.

JP 2008-309057 A

  With the need for miniaturization of electric vacuum cleaners, which are the main uses of electric blowers, there is an increasing demand for miniaturization of electric blowers.

  By the way, the electric blower mainly includes a turbo fan and an electric motor that drives the turbo fan. In the case of a conventional electric blower, the electric motor has a generally cylindrical appearance, and the turbofan has a disk-shaped appearance that is larger in diameter and flat than the electric motor.

  Therefore, in order to meet the demand for miniaturization of the electric blower, it is extremely important to reduce the size of the turbo fan (particularly, the size in the radial direction) that has a larger diameter than the electric motor. By reducing the radial dimension of the turbofan, the radial dimension of the electric blower is dramatically reduced.

  On the other hand, in order to maintain performance while reducing the size of the turbofan, it is necessary to increase the rotational speed of the turbofan and increase the flow path width.

  However, if the flow path width is increased, that is, if the height of the moving blade (the distance corresponding to the separation distance between the front shroud and the rear ruloud) is increased too much, the strength and rigidity of the turbofan will decrease and the number of rotations will increase. Together with this, the durability is reduced, and noise and vibration are generated.

  Further, when the height of the moving blade is increased, there is a high possibility that the noise of the turbofan increases. Therefore, it is conceivable to reduce the noise by dividing the multistage flow path in the direction of the rotation center line by passing an intermediate plate between the rotor blades as in a conventional electric blower. However, if the number of intermediate plates is simply increased according to the height of the moving blade, the assemblability of the turbofan deteriorates and the cost burden increases, which is not preferable.

  Therefore, the present invention proposes an electric blower and a vacuum cleaner that can cope with an increase in rotation accompanying a reduction in size. In addition, the present invention proposes an electric blower and a vacuum cleaner that have an impeller with good assemblability while having an intermediate plate.

In order to solve the above problems, an electric blower according to an embodiment of the present invention includes an electric motor having a rotor shaft, and an upstream impeller that sucks air from the outside by being integrally joined to one end portion of the rotor shaft. A downstream impeller that integrally rotates with the other end of the rotor shaft and sucks in air discharged from the upstream impeller, a flow path in the upstream impeller, and a flow in the downstream impeller A center plate that divides at least one of the paths into a plurality of rotor shaft rotation center line directions, the center plate being a rotor shaft rotation center in a flow path in the upstream impeller or a flow path in the downstream impeller Located at the suction port side of the center in the height in the linear direction, at least one blade of the upstream impeller and the downstream impeller and the intermediate plate have a slit that meshes with each other with the thickness of each other interposed therebetween. And the feather Side of the slit, open at the inner peripheral side of the blade than the inner diameter of the insertion plate, characterized that you have extended to a position close to the center of rotation of the impeller.

  Moreover, the vacuum cleaner concerning the embodiment of the present invention is provided with the above-mentioned electric blower.

The perspective view which shows the vacuum cleaner which concerns on embodiment of this invention. The longitudinal section showing the electric blower concerning the embodiment of the present invention. The perspective view which shows the upstream impeller of the electric blower which concerns on this invention. The disassembled perspective view which shows the upstream impeller of the electric blower which concerns on this invention. The isobaric diagram which shows an example of the analysis result of the electric blower which concerns on embodiment of this invention. The figure which shows the pressure distribution in an example of the analysis result of the electric blower which concerns on embodiment of this invention. The sound pressure level figure which shows an example of the analysis result of the electric blower which concerns on embodiment of this invention. The isobaric diagram which shows an example of the analysis result of the electric blower which concerns on embodiment of this invention. The figure which shows the pressure distribution in an example of the analysis result of the electric blower which concerns on embodiment of this invention. The isobaric diagram which shows an example of the analysis result of the electric blower which concerns on embodiment of this invention. The figure which shows the pressure distribution in an example of the analysis result of the electric blower which concerns on embodiment of this invention. The isobaric diagram which shows an example of the analysis result of the electric blower which concerns on embodiment of this invention. The figure which shows the pressure distribution in an example of the analysis result of the electric blower which concerns on embodiment of this invention.

  Embodiments of an electric blower and a vacuum cleaner according to the present invention will be described with reference to FIGS.

  FIG. 1 is a perspective view showing a vacuum cleaner according to an embodiment of the present invention.

  As shown in FIG. 1, the vacuum cleaner 1 according to the present embodiment is a so-called canister-type vacuum cleaner. The vacuum cleaner 1 includes a vacuum cleaner body 2 that can run on a surface to be cleaned, and a pipe portion 3 that can be detachably connected to the cleaner body 2.

  The vacuum cleaner main body 2 includes a main body case 5, a pair of wheels 6 positioned on both sides of the main body case 5, a detachable dust separating and collecting portion 7 positioned in the front half of the main body case 5, and the main body case 5. The electric blower 8 located in the latter half of the main body, a main body control unit 9 that mainly controls the operation of the electric blower 8, and a power cord 11 that guides electric power to the electric blower 8.

  The main body case 5 has a main body connection port 12 that can be connected to the dust separating and collecting part 7. The main body connection port 12 is a fluid inlet of the cleaner body 2.

  The wheel 6 is a large-diameter traveling wheel.

  The dust separating and collecting unit 7 separates air containing dust (hereinafter referred to as “dust-containing air”) sucked into the cleaner body 2 by the negative pressure generated by the operation of the electric blower 8 into air and dust. And collect and accumulate.

  The electric blower 8 sucks air and generates a negative pressure for sucking the dust into the dust separating and collecting part 7. The electric blower 8 is in the main body case 5 and is fluidly connected to the dust separating and collecting part 7, the main body connection port 12 and the pipe part 3.

  The main body control unit 9 has a plurality of operation modes set in advance. Further, the main body control unit 9 reads the operation signal from the pipe unit 3, selectively selects an arbitrary operation mode corresponding to the operation signal from a plurality of preset operation modes, and performs electric operation according to the selected operation mode. The blower 8 is operated. Each of the plurality of preset operation modes has different input values (input values of the electric blower 8) in association with the operation signal read from the pipe section 3.

  The power cord 11 includes a power plug 14 at the free end.

  The pipe portion 3 sucks dust-containing air from the surface to be cleaned and guides it to the cleaner body 2 by the negative pressure acting from the cleaner body 2 as the electric blower 8 is operated. The pipe portion 3 includes a connection pipe 19 as a joint that can be detachably connected to the cleaner body 2, a dust collection hose 21 that is fluidly connected to the connection pipe 19, and a hand that is fluidly connected to the dust collection hose 21. The operation tube 22, the grip portion 23 protruding from the hand operation tube 22, the operation portion 24 positioned on the grip portion 23, the extension tube 25 detachably connectable to the hand operation tube 22, and the attachment tube 25 can be attached and detached. And a suction port body 26 that can be connected.

  The connecting pipe 19 is fluidly connected to the dust separating and collecting part 7 through the main body connection port 12.

  The dust collection hose 21 is a long and flexible substantially cylindrical hose. One end of the dust collection hose 21 (here, the rear end) is connected to the connecting pipe 19. The dust collecting hose 21 is fluidly connected to the dust separating and collecting part 7 through the connecting pipe 19.

  The hand operation tube 22 is interposed between the dust collection hose 21 and the extension tube 25. One end portion (here, the rear end portion) of the hand operation tube 22 is connected to the other end portion (here, the front end portion) of the dust collecting hose 21. The hand operating tube 22 is fluidly connected to the dust separating and collecting unit 7 through the dust collecting hose 21 and the connecting tube 19.

  The grip portion 23 is a portion that the user grips with his / her hand to operate the vacuum cleaner 1. The grip portion 23 has an appropriate shape that can be easily gripped by a user with a hand and protrudes from the hand operation tube 22.

  The operation unit 24 includes a switch corresponding to each operation mode. Specifically, the operation unit 24 includes a stop switch 24 a that receives an input of an operation stop operation of the electric blower 8 and an activation switch 24 b that receives an input of an operation start operation of the electric blower 8. A user of the vacuum cleaner 1 operates the operation unit 24 to selectively select an operation mode of the electric blower 8. After the electric blower starts operation, the start switch 24b also functions as an operation mode selection switch. In this case, every time the operation signal is received from the start switch 24b, the main body control unit 9 switches the operation mode as strong → medium → weak → strong →. The operation unit 24 may separately include a weak operation switch (not shown), a medium operation switch (not shown), and a strong operation switch (not shown) instead of the start switch 24b.

  The extension tube 25 is an elongated substantially cylindrical tube that can be expanded and contracted. The extension tube 25 has a telescopic structure in which a plurality of cylindrical bodies are overlapped. One end portion (here, the rear end portion) of the extension tube 25 is detachably connected to the other end portion (here, the front end portion) of the hand operation tube 22. The extension pipe 25 is fluidly connected to the dust separating and collecting part 7 via the hand operation pipe 22, the dust collecting hose 21 and the connecting pipe 19.

  The suction port body 26 is detachably connected to the other end portion (here, the front end portion) of the extension pipe 25. The suction port body 26 has a structure capable of running or sliding on a surface to be cleaned such as a wooden floor or a carpet, and has a suction port 28 on the bottom surface facing the surface to be cleaned in the running state or the sliding state. Further, the suction port body 26 includes a rotary cleaning body 29 that is located at the suction port 28 and is rotatable, and an electric motor 31 that can rotationally drive the rotary cleaning body 29. The suction port body 26 is fluidly connected to the dust separating and collecting part 7 through the extension pipe 25, the hand operating pipe 22, the dust collecting hose 21 and the connecting pipe 19.

  When the start switch 24b receives the operation start operation, the electric vacuum cleaner 1 starts the operation of the electric blower 8 and generates a negative pressure (suction negative pressure) inside the cleaner main body 2. For example, when the electric blower 8 receives an operation start operation input from the start switch 24b while the electric blower 8 is stopped, the electric vacuum blower 1 first operates the electric blower 8 in the strong operation mode, and then inputs an operation start operation input to the start switch 24b. When the electric blower 8 is received, the electric blower 8 is operated in the middle operation mode, and when the start switch 24b receives an input of the operation start operation, the electric blower 8 is operated in the weak operation mode, and the following is repeated. The strong operation mode, the medium operation mode, and the weak operation mode are a plurality of operation modes set in advance. The input value decreases in the order of strong operation mode, medium operation mode, and weak operation mode.

  The negative pressure generated inside the vacuum cleaner body 2 acts on the suction port 28 of the suction port body 26 from the main body connection port 12 through the dust collection hose 21, the hand operation tube 22 and the extension tube 25. Due to the negative pressure acting on the suction port 28, the vacuum cleaner 1 sucks dust collected on the surface to be cleaned together with air from the suction port 28 to clean the surface to be cleaned. In the vacuum cleaner 1, the dust-containing air sucked into the suction port 28 is separated into air and dust by the dust separating and collecting unit 7. The vacuum cleaner 1 collects and separates dust separated from the dust-containing air in the dust separation and collection unit 7. On the other hand, the vacuum cleaner 1 sucks the air separated from the dust-containing air from the dust separating and collecting part 7 into the electric blower 8 and then exhausts it from the cleaner body 2.

  FIG. 2 is a longitudinal sectional view showing the electric blower according to the embodiment of the present invention.

  As shown in FIG. 2, the electric blower 8 according to this embodiment is integrally joined to the electric blower case 35, a motor portion 37 as an electric motor having a rotor shaft 36, and one end portion of the rotor shaft 36. The upstream impeller 38 that sucks air from outside the machine (the outside of the electric blower 8), the upstream diffuser 39 that decelerates the air discharged from the upstream impeller 38 and leads it to the motor unit 37, and the other of the rotor shaft 36 A downstream impeller 41 that sucks air discharged from the upstream impeller 38 and is integrally joined to the end of the lower end, and a downstream diffuser 42 that decelerates the air discharged from the downstream impeller 41 and guides it out of the machine. .

  The electric blower case 35 is a cylindrical outer shell that houses the motor unit 37, the upstream impeller 38, the upstream diffuser 39, the downstream impeller 41, and the downstream diffuser 42. The electric blower case 35 has a second suction port 43 positioned substantially concentric with the rotation center line C of the rotor shaft 36, and covers an upstream fan cover 45 that covers the upstream impeller 38 and the upstream diffuser 39, and an upstream diffuser. In addition to an upstream diffuser support ring 47 that supports 39, a motor case 48 that covers the motor unit 37, a discharge port 49 that is positioned substantially concentrically with the rotation center line C of the rotor shaft 36, and in cooperation with the motor case 48. A downstream fan cover 51 that covers the downstream impeller 41 and the downstream diffuser 42.

  In order to facilitate the description, the front and rear directions of the electric blower 8 will be described below with the second suction port 43 side of the rotation center line C as the front. In FIG. 1, the solid arrow X is directed from the rear to the front of the electric blower 8.

  The electric blower case 35 is combined in the order of the upstream fan cover 45, the upstream diffuser support ring 47, the electric motor case 48, and the downstream fan cover 51 from the front side with the electric motor case 48 sandwiched in the center.

  The upstream fan cover 45 is a bottomed cylindrical outer shell having an opening 52 that opens the bottom on the rear side. The upstream fan cover 45 has a second suction port 43 at the approximate center of the bottom wall on the front side. The second suction port 43 is an opening that guides air from the outside to the upstream impeller 38 and is a circular opening that is substantially concentric with the rotation center line C.

  The upstream diffuser support ring 47 is a flat ring-shaped outer shell that fits into the opening 52 of the upstream fan cover 45. The upstream diffuser support ring 47 projects into the upstream fan cover 45 to support the upstream diffuser 39 in the upstream fan cover 45 and bridges across the rotation center line C of the rotor shaft 36. A unit 53 is provided. The upstream diffuser support bridge portion 53 is provided in front of the motor portion 37 and includes a cylindrical bearing housing 55 that protrudes forward around the rotation center line C of the rotor shaft 36. The bearing housing 55 holds the bearing 56 on the inner peripheral surface. The bearing housing 55 has a through-hole 57 through which the rotor shaft 36 passes.

  The upstream diffuser support ring 47 includes a flange 58 that fixes the electric motor case 48.

  The motor case 48 is a cylindrical outer shell that has an opening 59 that opens the bottom on the front side and an opening 61 that opens the bottom on the rear side, and is connected to the upstream diffuser support ring 47. The motor case 48 includes a cylindrical bearing housing 62 that supports the rotor shaft 36 in cooperation with the bearing housing 55, a hemispherical partition wall 66 that guides air passing through the motor case 48 to the downstream impeller 41, and downstream And a flange 67 for fixing the side fan cover 51.

  The bearing housing 62 is located behind the motor unit 37 and protrudes rearward about the rotation center line C of the rotor shaft 36. The bearing housing 62 holds the bearing 68 on the inner peripheral surface. The bearing housing 62 has a through hole 69 through which the rotor shaft 36 passes. The bearing housing 62 is supported by bearing housing support beams 71 extending radially or in a cross shape toward the inner surface of the motor case 48.

  The partition wall 66 has an opening 72 for guiding air from the electric motor case 48 to the downstream impeller 41. The opening 72 has a circular shape substantially concentric with the rotation center line C.

  The downstream fan cover 51 has a cylindrical outer cylinder 51a connected to the motor case 48, an inner cylinder 51b inscribed in the outer cylinder 51a, and a rotation center line C of the rotor shaft 36 for supporting the downstream diffuser 42. And a downstream diffuser support bridge portion 73 that crosses and bridges.

  The inner cylinder 51 b has a shape substantially similar to that of the upstream fan cover 45 and covers the downstream impeller 41 and the downstream diffuser 42. Further, the inner cylinder 51b has a fourth suction port 74 at the approximate center of the bottom wall on the front side, and a discharge port 49 at the bottom on the rear side. The fourth suction port 74 is an opening that guides air from the motor unit 37 to the downstream impeller 41, and is a circular opening that is substantially concentric with the rotation center line C.

  The motor unit 37 includes a rotor shaft 36 that extends in the front-rear direction in the electric blower case 35, a rotor 75 that is integrally rotated with the rotor shaft 36, and a stator 76 that is fixed to the motor case 48 and surrounds the rotor 75. And a pair of brush mechanisms 77 that sandwich the rotor shaft 36 through the side wall of the motor case 48.

  The rotor shaft 36 is rotatably supported by bearings 56 and 68.

  The pair of brush mechanisms 77 are opposed to each other with the commutator 78 of the rotor 75 on the rotor shaft 36 interposed therebetween. Each brush mechanism 77 includes a carbon brush 79 that is in contact with the commutator 78 and a brush holder 81 that holds the carbon brush 79 in a retractable manner. The brush holder 81 presses the carbon brush 79 against the commutator 78 and obtains mutual conduction.

  The upstream impeller 38 includes a disk-shaped first plate 85, an annular second plate 87 having a first suction port 86 in the approximate center and spaced from the first plate 85, a first plate 85 and a first plate 85. A plurality of blades 88 extending between the two plates 87 and a middle plate 89 that divides the flow path in the upstream impeller 38 into a plurality of portions in the direction of the rotation center line C of the rotor shaft 36 are provided. The upstream impeller 38 is a turbo fan in which the exit angle of the blade 88 is backward.

  The first plate 85 is a so-called rear shroud, and has a fitting insertion hole 91 for fixing the entire upstream impeller 38 to the rotor shaft 36 at substantially the center.

  The second plate 87 is a so-called front shroud, and is an annular plate having the first suction port 86 as an inner periphery and an outer diameter substantially equal to that of the first plate 85. The second plate 87 has a trumpet shape in which an inner peripheral edge 87a, which is an opening edge of the first suction port 86, is located near the second suction port 43 of the upstream fan cover 45 and is gradually expanded toward the outer periphery and rearward. It is a curved plate. The first suction port 86 is a circular opening that is opposed to the second suction port 43 of the upstream fan cover 45 and is substantially concentric with the rotation center line C of the rotor shaft 36, and is slightly more than the second suction port 43. large.

  The blades 88 are located in an annular region from the opening edge of the first suction port 86 (that is, the inner peripheral edge 87a of the second plate 87) to the outer periphery of the first plate 85 and the second plate 87. It extends radially in the radial direction (orthogonal direction) of the rotation center line C passing through the approximate center of the two plates 87. The blades 88 are spirally viewed from the direction of the rotation center line C, and are spaced apart from each other at substantially equal intervals. The flow path surrounded and partitioned by the first plate 85, the second plate 87, and the blade 88 is referred to as an inter-blade flow path 92, and the flow path from the first suction port 86 to the inter-blade flow path 92 is referred to as an inlet flow path 93. Call.

  The middle plate 89 is located at the center of the height in the direction of the rotation center line C of the rotor shaft 36 in the flow path in the upstream impeller 38 (that is, the inter-blade flow path 92). Note that the intermediate plate 89 has a first suction port 86 in other words than the center of the height in the direction of the rotation center line C of the rotor shaft 36 in the flow path in the upstream impeller 38 (that is, the inter-blade flow path 92). For example, the first plate 85 and the second plate 87 may be biased.

  The upstream impeller 38 rotates in the direction opposite to the vortex wound by the blade 88.

  The upstream diffuser 39 is a so-called vane diffuser, and is located between the upstream impeller 38 and the upstream diffuser support bridge 53, and the air discharged from the upstream impeller 38 is upstream of the upstream diffuser support ring 47 and eventually. It smoothly guides into the motor case 48.

  The upstream diffuser 39 includes a substantially disc-shaped back plate 95, a plurality of guide vanes 96 as stationary blades extending on a surface (front surface) of the back plate 95 on the upstream impeller 38 side, and a motor portion of the back plate 95. A plurality of return guide vanes 97 extending on the surface (rear surface) on the 37 side. The upstream diffuser 39 has a diameter that is slightly smaller than the inner diameter of the upstream fan cover 45, and separates a gap between the upstream diffuser 39 and the upstream fan cover 45. This gap guides the air discharged from the outer periphery of the guide vane 96 to the return guide vane 97.

  The back plate 95 has a diameter larger than the diameter of the upstream impeller 38. The back plate 95 has a substantially circular through hole 98 into which the bearing housing 55 of the upstream side diffuser support ring 47 is fitted.

  The guide vane 96 surrounds the periphery of the upstream impeller 38 slightly away from the outer periphery of the upstream impeller 38 and faces the blade 88 or the inter-blade channel 92. Each guide vane 96 projects substantially vertically from the back plate 95 toward the front of the electric blower 8. The guide vanes 96 are spirally viewed from the direction of the rotation center line C of the rotor shaft 36 and extend side by side at substantially equal intervals.

  The space between the guide vanes 96 is a guide air passage 99 that becomes gradually wider. The air is discharged from the upstream impeller 38 to the outer peripheral side of the upstream diffuser 39 and is decelerated to recover the pressure. The direction of the vortex wound by the guide vane 96 faces the opposite direction of the vortex wound by the blade 88.

  The return guide vane 97 is located on the outer peripheral side of the back plate 95. Each return guide vane 97 projects substantially vertically from the back plate 95 toward the rear of the electric blower 8. Each return guide vane 97 is spirally viewed from the direction of the rotation center line C, and extends away from each other at substantially equal intervals.

  The space sandwiched between the return guide vanes 97 is the airflow passage 101 that guides air from the gap between the upstream diffuser 39 and the upstream fan cover 45 to the upstream diffuser support ring 47 and eventually to the motor case 48. The direction of the vortex wound by the return guide vane 97 is opposite to the direction of the vortex wound by the guide vane 96.

  The downstream impeller 41 has substantially the same structure as the upstream impeller 38. That is, the downstream impeller 41 includes a disk-shaped first plate 105, an annular second plate 107 having a third suction port 106 at a substantially central position and spaced from the first plate 105, and the first plate 105. And a second plate 107, and a middle plate 109 that divides the flow path in the downstream impeller 41 in the direction of the rotation center line C of the rotor shaft 36. The downstream-side impeller 41 is a turbo fan in which the exit angle of the blade 108 is rearward.

  The first plate 105 is a so-called rear shroud, and has a fitting insertion hole 111 that fixes the entire downstream impeller 41 to the rotor shaft 36 at substantially the center.

  The second plate 107 is a so-called front shroud, and is an annular plate having the third suction port 106 as an inner periphery and an outer diameter substantially equal to that of the first plate 105. The second plate 107 is a trumpet-shaped curved plate in which the inner peripheral edge 107a, which is the opening edge of the third suction port 106, is located near the opening 72 of the partition wall 66, and gradually expands outward and rearward. The third suction port 106 is a circular opening facing the opening 72 of the partition wall 66 and substantially concentric with the rotation center line C of the rotor shaft 36, and is slightly larger than the opening 72. The rotor shaft 36 reaches the fitting insertion hole 111 through the third suction port 106.

  The blades 108 are located in an annular region from the opening edge of the third suction port 106 (that is, the inner peripheral edge 107a of the second plate 107) to the outer periphery of the first plate 105 and the second plate 107. It extends radially in the radial direction (orthogonal direction) of the rotation center line C passing through the approximate center of the two plates 107. The blades 108 are spirally viewed from the direction of the rotation center line C, and are separated from each other at substantially equal intervals. The flow path surrounded by and partitioned by the first plate 105, the second plate 107, and the blades 108 is referred to as an inter-blade flow path 112, and the flow path from the third suction port 106 to the inter-blade flow path 112 is referred to as an inlet flow path 113. Call.

  The intermediate plate 109 is positioned at the center of the height in the direction of the rotation center line C of the rotor shaft 36 in the flow path (that is, the inter-blade flow path 112) in the downstream impeller 41. The intermediate plate 109 is located on the third suction port 106 side from the center of the height in the direction of the rotation center line C of the rotor shaft 36 in the flow path in the downstream impeller 41 (that is, the inter-blade flow path 112). In this case, the second plate 107 may be biased from the first plate 105.

  The downstream diffuser 42 includes a substantially disc-shaped back plate 115 and a plurality of guide vanes 116 as stationary blades extending on a surface (front surface) of the back plate 115 on the downstream impeller 41 side. The downstream diffuser 42 has a diameter that is slightly smaller than the inner diameter of the downstream fan cover 51, and separates a gap between the downstream diffuser 42 and the downstream fan cover 51. This gap guides the air discharged from the outer periphery of the guide vane 116 to the discharge port 49.

  The back plate 115 has a diameter larger than the diameter of the downstream impeller 41.

  The guide vane 116 is slightly separated from the outer periphery of the downstream impeller 41 and surrounds the periphery of the downstream impeller 41 and faces the blades 108 or the inter-blade channel 112. Each guide vane 116 projects substantially vertically from the back plate 115 toward the front of the electric blower 8. The guide vanes 116 are spirally viewed from the direction of the rotation center line C of the rotor shaft 36 and extend side by side at substantially equal intervals.

  The space sandwiched by the guide vanes 116 is a guide air passage 119 that gradually becomes wider. The air is discharged from the downstream impeller 41 to the outer peripheral side of the downstream diffuser 42 and decelerates to recover the pressure. The direction of the vortex wound by the guide vane 116 is opposite to the direction of the vortex wound by the blade 108.

  The electric blower 8 only needs to include at least one of the intermediate plate 89 on the upstream impeller 38 side and the intermediate plate 109 on the downstream impeller 41 side. Further, the intermediate plates 89 and 109 may be smaller in diameter than the first plates 85 and 105 and the second plates 87 and 107, respectively. In other words, the intermediate plates 89 and 109 divide the upstream half (inlet half and inner diameter half) of the inter-blade passages 92 and 112 into a plurality in the direction of the rotation center line C of the rotor shaft 36. I just need it.

  FIG. 3 is a perspective view showing an upstream impeller of the electric blower according to the present invention.

  FIG. 4 is an exploded perspective view showing the upstream impeller of the electric blower according to the present invention.

  As shown in FIG. 3 or FIG. 4, the blade 88 and the middle plate 89 of the upstream impeller 38 are provided with slits 121 and 122 that sandwich and engage each other.

  The downstream impeller 41 has the same structure as that of the upstream impeller 38, but the description is omitted because it is redundant.

  First, each blade 88 of the upstream impeller 38 is a strip-like long and thin metal plate, and has a slit 121 that engages the middle plate 89 with the thickness of the middle plate 89 interposed therebetween. The slit 121 is appropriately positioned according to the height position of the intermediate plate 89 between the first plate 85 and the second plate 87 (the height position of the rotor shaft 36 in the direction of the rotation center line C) and the blades 88. It opens toward the inner peripheral edge and extends toward the downstream side of the inter-blade channel 92.

  The blade 88 includes a plurality of connecting protrusions 123 protruding from both long sides.

  The intermediate plate 89 has a slit 122 that engages with the blade 88 while sandwiching the thickness of the blade 88. The slit 122 opens on the outer peripheral edge side of the intermediate plate 89 and extends in a spiral shape corresponding to the shape of the inter-blade channel 92.

  The first plate 85 and the second plate 87 have a plurality of slits 125 into which the connecting projection 123 of the blade 88 can be inserted and corresponding to the shape of the inter-blade channel 92.

  The upstream impeller 38 first engages the slits 121 and 122 so as to sandwich the thickness of each other to connect the middle plate 89 and the plurality of blades 88, and then connects the connection projection 123 of the blade 88 to the first plate 85. And after inserting into the slit 125 of the 2nd board 87, it fixes and assembles so that the connection protrusion 123 may be crimped and it may not come out of the slit 125. FIG. 3 shows the connecting protrusion 123 before caulking.

  Next, the pressure distribution and flow velocity distribution of air in the electric blower 8 will be described.

  In the following description, the height of the middle plates 89 and 109 is based on the first plates 85 and 105. That is, the central position of the flow path in the upstream impeller 38 and the flow path in the downstream impeller 41 in the direction of the rotation axis C of the rotor shaft 36 is referred to as “about half the height”. In addition, among the flow path in the upstream impeller 38 and the flow path in the downstream impeller 41, the height in the direction of the rotation axis C of the rotor shaft 36 is divided into three. The side near the second plates 87 and 107 is called “about two thirds”.

  FIG. 5 is an isobaric diagram showing an example of the analysis result of the electric blower according to the embodiment of the present invention.

  FIG. 6 is a diagram illustrating a pressure distribution in an example of an analysis result of the electric blower according to the embodiment of the present invention.

  5 (a) and 6 (a) show the analysis results of the electric blower 8 without the intermediate plates 89 and 109, and FIGS. 5 (b) and 6 (b) show a height of about half. It is an analysis result of the electric blower 8 provided with the middle plates 89 and 109.

  From the comparison of the analysis results shown in FIGS. 5 and 6, the electric blower 8 has a different suction work rate depending on the presence or absence of the middle plates 89 and 109, and the suction work rate is improved by about 1% when the middle plates 89 and 109 are provided. I understood.

  FIG. 7 is a sound pressure level diagram showing an example of an analysis result of the electric blower according to the embodiment of the present invention.

  In the analysis result shown in FIG. 7, the sound pressure level (broken line) of the electric blower 8 without the intermediate plates 89 and 109 is about 137 dBA in overall value, and the electric plate equipped with the intermediate plates 89 and 109 having a height of about one half. The sound pressure level (solid line) of the blower 8 is an overall value of about 134 dBA. From the comparison of both analysis results, the electric blower 8 provided with the middle plates 89 and 109 effectively suppresses noise at a portion where the sound pressure level is high that appears at about 3000 Hz.

  FIG. 8 is an isobaric diagram showing an example of the analysis result of the electric blower according to the embodiment of the present invention.

  FIG. 9 is a diagram illustrating a pressure distribution in an example of an analysis result of the electric blower according to the embodiment of the present invention.

  8 (a) and 9 (a) are analysis results of the electric blower 8 including the middle plates 89 and 109 having a height of about one half, and FIG. 8 (b) and FIG. 9 (b) are the heights. FIG. 8 (c) and FIG. 9 (c) show the results of analysis of the electric blower 8 provided with about one-third middle plates 89 and 109. FIGS. It is an analysis result of the blower 8.

  From the comparison of the analysis results shown in FIGS. 8 and 9, the electric blower 8 has a different suction work rate depending on the height position of the middle plates 89 and 109, and the height is about 2 compared with the electric blower 8 without the middle plates 89 and 109. The electric blower 8 provided with the one-half middle plates 89 and 109 improves the suction work rate by about 1%, and the electric blower 8 provided with the third middle plates 89 and 109 has the suction work rate of about 1 It was found that the electric blower 8 provided with the middle plates 89 and 109 having a height of about 2/3 is improved by about 2%.

  FIG. 10 is an isobaric diagram showing an example of the analysis result of the electric blower according to the embodiment of the present invention.

  FIG. 11 is a diagram illustrating a pressure distribution in an example of an analysis result of the electric blower according to the embodiment of the present invention.

  FIG. 10A and FIG. 11A show the analysis results of the electric blower 8 provided with the intermediate plate 89 having a height of about one half only in the upstream impeller 38. FIG. 10B and FIG. b) is an analysis result of the electric blower 8 including only the downstream impeller 41 and the intermediate plate 109 having a height of about one half.

  From the comparison of the analysis results shown in FIGS. 10 and 11, the electric blower provided with the intermediate plates 89 and 109 in either the upstream impeller 38 or the downstream impeller 41 compared to the electric blower 8 without the intermediate plates 89 and 109. No. 8 was found to improve the suction work rate by about 1%.

  FIG. 12 is an isobaric diagram showing an example of the analysis result of the electric blower according to the embodiment of the present invention.

  FIG. 13 is a diagram illustrating a pressure distribution in an example of an analysis result of the electric blower according to the embodiment of the present invention.

  12 (a) and 13 (a) are analysis results of the electric blower 8 without the intermediate plates 89 and 109, and FIGS. 12 (b) and 13 (b) are upstream sides of the inter-blade channels 92 and 112. FIG. It is an analysis result of the electric blower 8 provided with half plates 89 and 109 having a height of about one half in the half.

  From the comparison of the analysis results shown in FIG. 12 and FIG. 13, the intermediate plate 89 having a height of about one half in the upstream half of the inter-blade flow paths 92 and 112 compared to the electric blower 8 without the intermediate plates 89 and 109. , 109 is found to improve the suction power by about 3%.

  In the electric blower 8 and the vacuum cleaner 1 of this embodiment, the upstream-side impeller 38 and the downstream-side impeller 41 are disposed so as to sandwich the front and rear of the motor unit 37, so that the total passage of the inter-blade passages 92 and 112 is arranged. Increasing the height of the blades 88 and 108 of the individual impellers 38 and 41 while expanding the width of the conventional electric blower and reducing the radial dimensions of the upstream and downstream impellers 38 and 41. Can be suppressed. This suppresses an increase in rotational speed and a decrease in durability while preventing a decrease in strength and rigidity of the upstream impeller 38 and the downstream impeller 41. In addition, the upstream fan cover 45 and the downstream fan cover 51 can be reduced in size, and the electric blower case 35 can be slimmed into a substantially uniform cylindrical shape to reduce the size of the electric blower 8 and thus the vacuum cleaner 1. Can do.

  Moreover, the electric blower 8 and the vacuum cleaner 1 of this embodiment flow into the inter-blade channel 92 from the first suction port 86 by dividing the inter-blade channels 92 and 112 into multistages by the intermediate plates 89 and 109. Air and air flowing into the inter-blade channel 112 from the third suction port 106 are rectified to suppress pressure fluctuations to suppress noise generation, improve the suction work rate, and suppress noise and vibration generation.

  Further, in the electric blower 8 and the vacuum cleaner 1 according to the present embodiment, the middle plate 89 is arranged at the first suction port 86 side of the center of the height in the direction of the rotation axis C of the rotor shaft 36 in the inter-blade channel 92 or from the center. Alternatively, the suction power is further improved by disposing the intermediate plate 109 closer to the third suction port 106 side than the center of the height in the direction of the rotation axis C of the rotor shaft 36 in the inter-blade channel 112.

  Furthermore, in the electric blower 8 and the vacuum cleaner 1 of the present embodiment, the intermediate plate 89 is disposed in the upstream half of the inter-blade channel 92 or the intermediate plate 109 is disposed in the upstream half of the inter-blade channel 112. By arranging in, the suction power is further improved.

  Moreover, the electric blower 8 and the vacuum cleaner 1 of this embodiment have a favorable assembly property because the middle plate 89 and the blade 88 or the middle plate 109 and the blade 108 are combined by the slits 121 and 122 meshing with each other.

  Therefore, according to the electric blower 8 and the electric vacuum cleaner 1 according to the present embodiment, it is possible to cope with the high rotation accompanying the downsizing. Moreover, according to the electric blower 8 and the vacuum cleaner 1 which concern on this embodiment, this invention can be equipped with the impellers 38 and 41 with favorable assembly property, providing the intermediate plates 89 and 109. FIG.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Vacuum cleaner 2 Vacuum cleaner main body 3 Pipe part 5 Main body case 6 Wheel 7 Dust separation dust collection part 8 Electric blower 9 Main body control part 11 Power cord 12 Main body connection port 14 Power plug 19 Connection pipe 21 Dust collection hose 22 Hand control pipe 23 Grasp part 24 Operation part 24a Stop switch 24b Start switch 25 Extension pipe 26 Suction port body 28 Suction port 29 Rotational cleaning body 31 Electric motor 35 Electric blower case 36 Rotor shaft 37 Motor part 38 Upstream impeller 39 Upstream diffuser 41 Downstream side Impeller 42 Downstream diffuser 43 Second suction port 45 Upstream fan cover 47 Upstream diffuser support ring 48 Motor case 49 Discharge port 51 Downstream fan cover 51a Outer cylinder 51b Inner cylinder 52 Opening 53 Upstream diffuser support bridge 55 Bearing Housing 56 Bearing 57 Through-hole 58 Flange 59, 61 Open 62 Bearing housing 66 Bulkhead 67 Flange 68 Bearing 69 Through port 71 Bearing housing support beam 72 Opening 73 Downstream diffuser support bridge 74 Fourth suction port 75 Rotor 76 Stator 77 Brush mechanism 78 Commutator 79 Carbon brush 81 Brush cage 85 First plate 86 First suction port 87 Second plate 87a Inner peripheral edge 88 Blade 89 Middle plate 91 Insertion hole 92 Inter-blade channel 93 Inlet channel 95 Back plate 96 Guide vane 97 Return guide vane 98 Through hole 99 Guide air Route 101 Overflow passage 105 First plate 106 Third suction port 107 Second plate 107a Inner peripheral edge 108 Blade 109 Middle plate 111 Insertion hole 112 Inter-blade passage 113 Inlet passage 115 Back plate 116 Guide vane 119 Guide air passage 121, 122, 125 Slit 123 Connecting projection

Claims (2)

An electric motor having a rotor shaft;
An upstream impeller that rotates integrally with one end of the rotor shaft and sucks air from outside the machine;
A downstream impeller that rotates integrally with the other end of the rotor shaft and sucks in air discharged from the upstream impeller; and
A middle plate that divides at least one of the flow path in the upstream impeller and the flow path in the downstream impeller into a plurality in the direction of the rotor shaft rotation centerline,
The intermediate plate is located closer to the suction port than the center of the height in the rotor shaft rotation center line direction in the flow path in the upstream impeller or the flow path in the downstream impeller ,
At least one blade of the upstream impeller and the downstream impeller and the intermediate plate have slits that engage and combine each other with a plate thickness interposed therebetween,
The vane side of the slit, the electric blower, characterized that you have extended to a position close to the center of rotation of the impeller than the inner diameter of the insertion plate open on the inner peripheral side of the vane. An electric vacuum cleaner comprising the electric blower according to claim 1 .

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