JP4997960B2 - Electric blower and vacuum cleaner - Google Patents

Description

  The present invention relates to an electric blower and a vacuum cleaner used for a vacuum cleaner and the like.

  The configuration of this type of conventional electric blower will be described with reference to FIG.

In FIG. 5, 2 is a stator formed by applying field winding (omitted) to the field core 3, 5 is provided with armature winding (schematic) 8 on an armature core 15 passed through the shaft 6, The commutator 9 is a rotor that is coaxially disposed and rotatably supported by bearings 10 provided at both ends of the shaft 6. The stator 2 and the rotor 5 are fixed to a load side bracket 11 and an anti-load side bracket 12, and a pair of carbon brushes 13 are inserted into the anti-load side bracket 12 via deformed tubes 14. Reference numeral 19 denotes an exhaust port.

  Further, the shaft 6 of the output shaft is provided with an impeller 16, and an air guide 17 that forms an air passage on the outer periphery of the impeller 16 is disposed. The air guide 17 includes a diffuser portion 20 having a plurality of diffuser passages constituted by adjacent stationary vanes 26 on the surface, a flow changing portion 21 for guiding the flow to the back surface of the air guide 17, and an air flow at the central portion. It is constituted by a return passage 22 for guiding it.

  A resin sealing member 25 has a third air inlet 24 in the center and is welded to the fan case 18. The fan case 18 is attached so as to cover the impeller 16 and the air guide 17. A blower 1 is configured.

  The operation of the conventional electric blower 1 configured as described above is as follows.

  When electric power is supplied, the current conducted through the field winding is transmitted to the commutator 9 through the carbon brush 13, and a force is generated between the magnetic flux generated in the field core 3 and the current passing through the armature winding 8. Occurs and the rotor 5 rotates.

Next, as the rotor 5 rotates, the impeller 16 fixed to the shaft 6 of the rotor 5 rotates, and the air in the impeller 16 is accelerated. Most of the increased air is supplied to the air guide 17. It passes through the diffuser part 20 and is decelerated and enters the flow changing part 21, the direction is changed by 180 degrees, and it is guided through the return passage 22 into the electric blower 1 (for example, Patent Document 1). reference).
JP-A-5-76153

  However, in the configuration of the conventional electric blower described in Patent Document 1, since the front surface of the third intake port 24 has a negative pressure, a small part of the air discharged from the impeller 16 is directed to the diffuser unit 20. Instead of flowing in, a reverse flow is generated between the fan case 18 and the impeller 16 so as to be sucked from the inlet portion 16a of the impeller 16 again. In order to prevent this, the seal member 25 is present, but the effect is not perfect.

  The present invention solves the above-mentioned conventional problems, prevents the air discharged from the impeller from flowing back from between the impeller and the fan case, and returning to the inlet of the impeller again, thereby reducing the loss at the same portion. An object of the present invention is to provide an electric blower having high air performance and a vacuum cleaner using the same.

In order to solve the above-described conventional problems, an electric blower of the present invention includes an impeller that is fixed to a shaft of a rotatable rotor and has a first air inlet in the center, and an air provided on an outer peripheral portion of the impeller. A resin having a guide, a second air inlet in the center and a fan case covering the impeller and the air guide, and a third air inlet arranged in the center between the inner wall of the fan case and the impeller A substantially circular seal member, and the air guide is provided on the outer peripheral portion of the impeller, and includes a diffuser portion composed of a plurality of stationary blades, a flow changing portion provided on the outer peripheral portion for returning the air flow, and a central air flow A return passage that leads to the portion, and the inner peripheral portion of the seal member and the inner peripheral portion of the impeller, and the outer peripheral portion of the seal member and the outer peripheral portion of the impeller are close to each other or in sliding contact with each other. In the outer peripheral portion of the seal member, the side surface is in contact with the outer peripheral end portion of the impeller and a rib formed in a circumferential shape is formed, and an accelerated air flow is discharged. Air leakage from the outlet portion of the impeller to the inlet portion can be prevented, air loss is reduced, and an electric blower having high air performance can be obtained.

  Moreover, the vacuum cleaner of this invention is provided with the electric blower of any one of Claims 1-5, and can provide the vacuum cleaner which has high suction performance.

  The electric blower of the present invention has low air loss and high suction performance.

  According to a first aspect of the present invention, there is provided an impeller which is fixed to a shaft of a rotatable rotor and has a first intake port in the center, an air guide provided in an outer peripheral portion of the impeller, and a second intake port in the center. And a fan case that covers the impeller and the air guide, and a substantially circular sealing member made of resin having a third air inlet in the center that is disposed between the inner wall of the fan case and the impeller. The guide is provided on the outer peripheral portion of the impeller, and includes a diffuser portion including a plurality of stationary blades, a flow changing portion provided on the outer peripheral portion for returning the airflow, and a return passage for guiding the airflow to the central portion, and the seal The inner peripheral part of the member and the inner peripheral part of the impeller, and the outer peripheral part of the seal member and the outer peripheral part of the impeller are brought close to or in sliding contact with each other. Air leaks from the impeller outlet to the inlet, where the surface is in contact with the outer peripheral edge of the impeller and is formed with a circumferentially formed rib. Can be prevented, air loss is reduced, and an electric blower having high air performance can be obtained.

In addition, it is possible to reduce the friction loss on the outer periphery of the impeller having a high peripheral speed, improve the air performance and reduce the mechanical loss, and provide a highly efficient electric blower .

2nd invention is provided with the electric blower of Claim 1 , and can provide the vacuum cleaner which has high suction performance.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a partial cross-sectional view of the electric blower according to the first embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the same component as the said conventional electric blower, and the description is abbreviate | omitted.

  In FIG. 1, 16 c is a first air inlet formed in the impeller 16, 18 a is a second air inlet formed in the fan case 18, and 24 is a third air inlet formed in the seal member 25. Thus, the second intake port 16c and the third intake port 24 communicate with each other.

  In the present embodiment, a resin seal member 25 is disposed between the impeller 16 and the inner wall of the fan case 18 so as to be welded to the fan case 18. The tip on the mouth 24 side is bent so as to cover the inlet portion 16a of the impeller 16, and is brought into contact with the inlet portion 16a. In addition, ribs 27A and ribs 27B are suspended from the end of the outlet side of the impeller 16, the tips of the ribs 27A are close to the top of the impeller 16, and the side surfaces of the ribs 27B are in contact with the outer periphery of the impeller 16 in the radial direction. Yes.

  The operation of the electric blower 1 in the present embodiment configured as described above is as follows.

  When electric power is supplied to the electric blower 1, the airflow generated in the impeller 16 by rotating the rotor 5 passes through the diffuser portion 20 of the air guide 17 and enters the flow changing portion 21 as in the conventional example, The direction is changed by 180 degrees, passes through the return passage 22, and is guided into the electric blower 1. However, a small part of the airflow discharged from the impeller 16 does not flow into the diffuser portion 20 because the front surface of the third intake port 24 has a negative pressure, and flows backward between the fan case 18 and the impeller 16. Although it is going to be sucked in again from the inlet part of the impeller 16, the ribs 27A and the ribs 27B provided on the resin seal member 25 serve as a protective wall, and it is difficult for recirculation to occur.

  Furthermore, the flow of air is also prevented by the sealing effect between the inlet portion 16a of the impeller 16 and the sealing member 25, and no recirculation occurs.

  As described above, according to the present embodiment, the resin seal member 25 prevents the circulation by both the role of the guide that guides the intake air smoothly to the impeller 16 and the inlet portion 16a and the outlet portion 16b of the impeller 16. It plays the role of a seal, reduces air loss in the same part, and can realize an electric blower with high air performance.

( Reference form 1 )
Figure 2 is a partial cross-sectional view of an electric blower in the first reference embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the same component as the electric blower in the said conventional electric blower and the said 1st Embodiment, and the description is abbreviate | omitted.

Electric blower in this reference embodiment, as shown in FIG. 2, the impeller 16, the sealing member 25 made of resin between the inner wall of the fan case 18, is arranged in such a way is welded to the fan case 18 The tip of the seal member 25 on the third inlet 24 side is bent so as to cover the inlet portion 16a of the impeller 16, and is in contact with the inlet portion 16a. Further, a rib 28 having a thin thread shape and a tip contacting the upper outer periphery of the impeller 16 is formed on the end of the impeller 16 on the outlet 16b side.

Operation of the electric blower 1 in the configured present reference embodiment as described above is as follows.

  When electric power is supplied to the electric blower 1, the airflow generated in the impeller 16 by rotating the rotor 5 passes through the diffuser portion 20 of the air guide 17 and enters the flow changing portion 21 as in the conventional example, The direction is changed by 180 degrees, passes through the return passage 22, and is guided into the electric blower 1. However, a small part of the airflow discharged from the impeller 16 does not flow into the diffuser portion 20 because the front surface of the third intake port 24 has a negative pressure, and flows backward between the fan case 18 and the impeller 16. The rib 28 provided on the resin seal member 25 is in contact with the outer peripheral upper portion of the impeller 16, and the impeller 16 rotates in this state. Therefore, it becomes a defense wall against air leakage, and it is difficult for recirculation to occur.

  Further, since the tips of the ribs 28 are thin, the contact resistance is very small with respect to the rotation of the impeller 16, and the loss due to sliding is small. Furthermore, the flow of air is also prevented by the sealing effect between the inlet portion 16a of the impeller 16 and the sealing member 25, and no recirculation occurs.

Thus, according to this reference embodiment, the sealing member 25 made of resin, the role of the guide which leads to smooth the impeller 16 an intake, at both the inlet portion 16a and outlet portion 16b of the impeller 16, as much as possible sliding It plays the role of a seal that prevents air circulation in a form that reduces the loss due to movement, reducing the air loss at the same part, and realizing an electric blower with high air performance. A plurality of ribs 28 may be provided. Moreover, a thin thread-like rib can be substituted for a burr.

( Reference form 2 )
Figure 3 is a partial cross-sectional view of an electric blower according to the second reference embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the same component as the said conventional electric blower and the electric blower in the said embodiment, and the description is abbreviate | omitted.

Electric blower in this reference embodiment, as shown in FIG. 3, the impeller 16, while the fan case 18, in a manner sealing member 25 made of a resin is welded to the fan case 18, it is arranged, sealed The tip of the member 25 on the third air inlet 24 side is bent so as to cover the inlet portion 16a of the impeller 16, and is in contact with the inlet portion 16a. A rib 27 </ b> A whose tip is close to the top of the impeller 16 is formed at the end of the impeller 16 on the outlet 16 b side. Further, the outer peripheral tip of the impeller 16 and the end face of the seal member 25 are close to or in contact with each other. Further, the seal member 25 extends to the upper surface of the diffuser portion 20, seals the upper surface of the diffuser portion 20, and the diffuser passage. The airtightness is raised.

Operation of the electric blower 1 in the configured present reference embodiment as described above is as follows.

  When electric power is supplied to the electric blower 1, the airflow generated in the impeller 16 by rotating the rotor 5 passes through the diffuser portion 20 of the air guide 17 and enters the flow changing portion 21 as in the conventional example, The direction is changed by 180 degrees, passes through the return passage 22, and is guided into the electric blower 1. However, a small part of the airflow discharged from the impeller 16 does not flow into the diffuser portion 20 because the front surface of the third intake port 24 has a negative pressure, and flows backward between the fan case 18 and the impeller 16. The rib 27A provided on the resin seal member 25 is close to the impeller 16 and tends to be a protective wall, so that it is difficult to generate recirculation. .

  Further, since the seal member 25 is close to or in contact with the outer peripheral tip of the impeller 16, the contact resistance is very small with respect to the rotation of the impeller 16, and the loss due to sliding is small, so that a high sealing effect is obtained. No loss due to reflux occurs.

  Further, since the seal member 25 is extended from the outer peripheral tip of the impeller 16 so as to cover the upper surface of the diffuser part 20, an air flow is generated by a straight path from the outlet part 16 b of the impeller 16 to the inlet part of the diffuser part 20. Can be efficiently and linearly guided to the diffuser portion 20, and the airflow can flow in a highly airtight closed space formed by the diffuser portion 20 and the seal member 25, whereby high pressure recovery performance can be obtained.

Thus, according to this reference embodiment, the sealing member 25 made of resin, the role of the guide which leads to smooth the impeller 16 an intake, at both the inlet portion 16a and outlet portion 16b of the impeller 16, as much as possible sliding The role of a seal that prevents air circulation in a manner that reduces loss due to movement, smooth inflow due to passage formation from the outlet portion 16b of the impeller 16 to the diffuser portion 20, and high airtightness in the diffuser portion 20 The pressure recovery performance is improved by the property, and the air loss in the same part is reduced, and an electric blower with high air performance can be realized.

( Reference form 3 )
Figure 4 is a partial cross-sectional view of an electric blower in the third reference embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the same component as the said conventional electric blower and the electric blower in the said embodiment, and the description is abbreviate | omitted.

Electric blower in this reference embodiment, as shown in FIG. 4, the impeller 16, between the inner wall of the fan case 18, the sealing member 25 made of resin is arranged in such a way is welded to the fan case 18 The tip of the seal member 25 on the third inlet 24 side is bent so as to cover the inlet portion 16a of the impeller 16, and is in contact with the inlet portion 16a.

  Further, a rib 27 </ b> A whose tip is close to the upper surface of the impeller 16 is suspended from the end of the seal member 25 on the outlet 16 b side of the impeller 16.

  Further, the outer peripheral tip of the impeller 16 and the end face of the sealing member 25 are close to or in sliding contact with each other, and the sealing member 25 extends to the upper surface of the diffuser portion 20 and further to the flow changing portion 21, and the upper surface of the diffuser portion 20. And the side is sealed to increase the airtightness of the diffuser passage.

Operation of the electric blower 1 in the configured present reference embodiment as described above is as follows.

  When electric power is supplied to the electric blower 1, the rotor 5 rotates and the air flow generated by the impeller 16 passes through the diffuser portion 20 of the air guide 17 and is decelerated and enters the flow changing portion 21 to change the direction by 180 degrees. Then, it passes through the return passage 22 and is guided into the electric blower 1. However, a small part of the airflow discharged from the impeller 16 does not flow into the diffuser portion 20 because the front surface of the third intake port 24 has a negative pressure, and flows backward between the fan case 18 and the impeller 16. The rib 27A provided on the resin seal member 25 is close to the upper surface of the impeller 16 and becomes a protective wall, so that it is difficult for the circulation to occur. Yes.

  Further, since the seal member 25 is close to or slidably contacted with the outer peripheral tip of the impeller 16, the contact resistance is very small with respect to the rotation of the impeller 16, and the loss due to sliding is small, so that a high sealing effect is obtained. No loss due to reflux occurs.

  Furthermore, since the seal member 25 extends from the outer peripheral tip portion of the impeller 16 so as to cover the upper surface of the diffuser portion 20 and further the flow changing portion 21, the seal member 25 extends from the outlet portion 16 b of the impeller 16 to the inlet portion of the diffuser portion 20. With the straight path to the airflow, the airflow is efficiently and linearly guided to the diffuser part 20, and further, the airflow flows through the highly airtight closed space formed by the diffuser part 20, the flow changing part 21 and the seal member 25. High pressure recovery performance can be obtained.

Thus, according to this reference embodiment, the sealing member 25 made of resin, the role of the guide which leads to smooth the impeller 16 an intake, at both the inlet portion 16a and outlet portion 16b of the impeller 16, as much as possible sliding The role of a seal that prevents air circulation in a form that reduces loss due to movement, smooth inflow due to passage formation from the outlet portion 16b of the impeller 16 to the diffuser portion 20, and further, from the diffuser portion 20 to the flow changing portion 21 has improved the pressure recovery performance by maintaining high airtightness over a long passage, reducing air loss in the same part, and realizing an electric blower with high air performance.

Further, the electric blower 1 according to the first above you facilities, by adopting the vacuum cleaner, it is possible to provide a vacuum cleaner with a high suction performance.

  As described above, since the electric blower and the vacuum cleaner according to the present invention can improve the suction work rate due to the high suction performance, the electric blower and the vacuum cleaner can be widely applied to applications such as household electric appliances and industrial equipment using the electric blower.

The fragmentary sectional view of the electric blower in the 1st Embodiment of this invention The fragmentary sectional view of the electric blower in the 1st reference form of the present invention Partial sectional drawing of the electric blower in the 2nd reference form of this invention Partial sectional drawing of the electric blower in the 3rd reference form of this invention Partial sectional view showing a conventional electric blower

DESCRIPTION OF SYMBOLS 1 Electric blower 2 Stator 5 Rotor 11 Load side bracket 12 Anti-load side bracket 13 Carbon brush 15 Armature core 16 Impeller 17 Air guide 18 Fan case 19 Exhaust port 20 Diffuser part 21 Flow change part 22 Return path 24 3rd inlet port 25 Seal member 26 Stator blade 27 Rib A, B
28 Ribs

Claims (2)

An impeller fixed to the shaft of the rotatable rotor and having a first intake port at the center, an air guide provided at the outer periphery of the impeller, a second intake port at the center and the impeller and the A fan case that covers the air guide; and a substantially circular sealing member made of resin having a third air inlet in the center that is disposed between the inner wall of the fan case and the impeller. A diffuser portion provided on the outer peripheral portion and including a plurality of stationary blades; a flow changing portion provided on the outer peripheral portion for returning the airflow; and a return passage for guiding the airflow to the central portion; and an inner peripheral portion of the seal member; The inner peripheral portion of the impeller, and the outer peripheral portion of the seal member and the outer peripheral portion of the impeller are close to or in sliding contact with each other, and the side surface of the outer peripheral portion of the seal member Contact with the outer peripheral edge of La, and the electric blower, wherein a rib formed in a circumferential shape is formed. A vacuum cleaner comprising the electric blower according to claim 1 .

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