JP5245995B2 - Electric blower and electric vacuum cleaner using the same - Google Patents

Description

  The present invention relates to an electric blower and a vacuum cleaner.

  In recent years, electric vacuum cleaners using electric blowers have a tendency to increase output in order to effectively perform carpet cleaning and the like.

  Hereinafter, a conventional electric blower will be described with reference to FIGS.

  7 is a half sectional view of a conventional electric blower, FIG. 8 is a perspective view of an impeller of the electric blower, and FIG. 9 is a side sectional view and a partially enlarged view (part A) of the impeller.

  7-9, 1 is the impeller main body of the conventional electric blower. Reference numeral 2 denotes a rear shroud made of sheet metal, and reference numeral 3 denotes a front shroud made of sheet metal that faces the rear shroud, and has an air inlet 3a in the center. 4 is a plurality of sheet metal blades provided in the pair of front and rear shrouds 3 and 2, and 5 is a resin-made three-dimensional curved surface located on the inlet side extension of the blade 4. It is an inducer and is integrally arranged on the base part 6. The front and rear shrouds 3 and 2 facing each blade 4 are joined by caulking. Reference numeral 8 denotes a motor for driving the impeller body 1, and 9 denotes an air guide. Reference numeral 10 denotes a fan case that includes the impeller body 1 and the air guide 9 and is airtightly attached to the outer periphery of the motor 8, and has a suction port 10a at the center.

  The operation of the conventional electric blower configured as described above will be described. The impeller body 1 rotates at a high speed, sucks an air flow from the intake port 3a of the front shroud 3, and the air flow is not greatly disturbed by the inducer 5. Then, it passes between the following blades 4 and is discharged from the outer periphery of the impeller body 1. Further, the air flow passes through the air guide 9 and is discharged into the motor 8. After the motor 8 is cooled, the air flow is discharged out of the motor 8.

In this conventional electric blower, when the impeller body 1 rotates, air is sucked from the suction port 10 a of the fan case 10. This air flow passes from the region surrounded by the inducer 5, the base 6 and the front shroud 3 to the region surrounded by the blade 4 and the front and rear shrouds 3, 2. At this time, it is necessary to consider that the boundary portion between the base portion 6 and the rear surface shroud 2 should be smooth so as to eliminate air loss, pressure fluctuation, or air leakage that occurs at the boundary portion. Therefore, as shown in FIG. 8B, the thin flat surface portion 7 is provided immediately before the base portion 6 is connected to the rear shroud 2 (see, for example, Patent Document 1).
JP 11-351192 A

  However, in the configuration of the conventional electric blower as described in Patent Document 1, even if the thin flat surface portion 7 is provided immediately before the base portion 6 is connected to the rear shroud 2, there is no step at the boundary portion. Therefore, it has been difficult to eliminate the above-described loss.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and reduces the air loss, pressure fluctuation disturbance, and air leakage that occur between the base portion of the inducer and the rear shroud, and the electric blower and the electric device with improved suction capability. The purpose is to provide a vacuum cleaner.

  In order to solve the above-described conventional problems, an electric blower of the present invention includes an impeller body, an air guide arranged on an outer periphery of the impeller body, for regulating an air flow discharged from the impeller body, and guiding the air flow downstream, and the impeller A fan case that includes a main body and the air guide and includes a suction port in the center, and an electric blower that includes a motor that rotationally drives the impeller body, wherein the impeller body includes a front shroud that includes a suction port in the center; A rear shroud opposed thereto, an inducer provided at a central portion of the rear shroud and having a plurality of blades on a substantially convex base portion, and a plurality of blades arranged on the outer periphery of the inducer And including the inducer and the blade between the front shroud and the rear shroud, However, it is substantially the same as the outer diameter of the rear shroud, and there is no step between the base portion and the rear shroud, thereby eliminating collision loss, disturbance of pressure fluctuations, or air leakage, and blowing efficiency. It is possible to provide an electric blower with an improved height.

  The electric blower and vacuum cleaner of the present invention have high air performance.

  The first invention includes an impeller body, an air guide arranged on an outer periphery of the impeller body, which regulates an airflow discharged from the impeller body, and guides the air flow downstream, and includes the impeller body and the air guide in the center. In the electric blower including a fan case having a suction port and a motor for rotationally driving the impeller body, the impeller body includes a front shroud having a suction port in the center, a rear shroud facing the shroud, and the rear shroud. An inducer having a plurality of blades on a substantially convex base portion, and a plurality of blades arranged on the outer periphery of the inducer, and a front shroud and a rear shroud. The outer diameter of the base portion is substantially the same as the outer diameter of the rear shroud. Shall in, there is no level difference between reaching the rear shroud from the base portion, the disturbance of the collision loss and the pressure fluctuation caused by it or air leakage is eliminated, it is possible to provide an electric blower with increased blowing efficiency.

  The second invention is one in which the vicinity of the outer periphery of the base part of the first invention is welded and fixed to the rear shroud, and high stability can be obtained during high-speed rotation, and air loss inside the impeller body can be suppressed. It is.

  The third invention is such that the outer periphery of the base portion of the first or second invention overlaps with the outer periphery of the rear shroud, so that high stability during high-speed rotation is obtained, and the outer periphery of the impeller body is Loss and air loss inside the impeller body can be suppressed.

  According to a fourth aspect of the present invention, a groove portion for inserting a plurality of blades is provided in the base portion of any one of the first to third aspects, and a caulking protrusion for the blade is inserted into the bottom surface of the groove portion. With a square hole, the base part can be fixed simultaneously when caulking, reducing man-hours, providing high stability during high-speed rotation, and suppressing air loss inside the impeller body. .

  In a fifth aspect of the present invention, an extremely fine convex rib is formed over the entire circumference of the base portion of any one of the first to fourth aspects of the invention, and the tip of the convex rib is brought close to the inner wall of the air guide. Thus, the loss generated in the gap between the impeller body and the air guide can be reduced, and the air loss inside the impeller body can also be suppressed.

The vacuum cleaner in the sixth invention includes the electric blower of any one of the first to fifth inventions, and can realize 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 side sectional view of an impeller body of an electric blower according to a first embodiment of the present invention. In addition, about the same component as the said conventional electric blower, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 1, 1 is an impeller body of the electric blower in the present embodiment. Reference numeral 2 denotes a rear shroud made of sheet metal, and reference numeral 3 denotes a front shroud made of sheet metal that faces the rear shroud. Reference numeral 4 denotes a plurality of sheet metal blades provided in the pair of rear and front shrouds 2 and 3, and reference numeral 5 denotes a resin made of resin having a three-dimensional curved surface located on the inlet side extension of the blade 4. It is an inducer, and is composed of a base part 6 and blades 5 a formed integrally with the base part 6.

  The rear and front shrouds 2 and 3 facing each blade 4 are joined by caulking. Here, the base portion 6 extends so that the outer diameter thereof coincides with the outer diameter of the rear shroud 2. In addition, although illustration is abbreviate | omitted, the impeller main body 1 of this Embodiment is attached to the axis | shaft of the motor 8 similarly to the conventional electric blower, and becomes an electric blower.

  The operation of the electric blower in the present embodiment configured as described above will be described. When the impeller body 1 rotates, air is sucked from the suction port 10a of the fan case 10. This air flow passes from the region surrounded by the inducer 5, the base portion 6 and the front shroud 3 to the region surrounded by the blade 4, the front shroud 3 and the base portion 6.

  Conventionally, since the air flow hits the blade 4 and simultaneously passes through the boundary portion between the base portion 6 and the rear shroud 2, the step of the base portion 6 causes air loss and turbulence in pressure fluctuation due to turbulence, However, in the impeller body 1 in the present embodiment, the base portion 6 is smooth to the outer periphery of the rear shroud 2. Therefore, there is no level difference and no conventional loss occurs.

  As described above, according to the present embodiment, since the outer diameter of the base portion 6 of the inducer 5 is substantially the same as that of the rear shroud 2, air loss in the impeller body 1 can be suppressed, and high air performance is achieved. It is possible to provide an electric blower having

(Embodiment 2)
FIG. 2 is a side sectional view of the impeller body of the electric blower according to the second 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 1st Embodiment, and the description is abbreviate | omitted.

  In FIG. 2, 1 is an impeller body of the electric blower in the present embodiment. 2 is a rear shroud made of sheet metal, and 3 is a front shroud made of sheet metal facing the shroud. Reference numeral 4 denotes a plurality of sheet metal blades provided in the pair of rear and front shrouds 2 and 3, and reference numeral 5 denotes a resin made of resin having a three-dimensional curved surface located on the inlet side extension of the blade 4. It is an inducer and is integrally arranged on the base part 6.

The rear and front shrouds 2 and 3 facing each blade 4 are joined by caulking. Here, the base portion 6 extends so that the outer diameter thereof coincides with the outer diameter of the rear shroud 2. Reference numeral 10 denotes a welded portion that is provided in the vicinity of the outer periphery of the base portion 6 and fixes the base portion 6 to the rear surface shroud 2, and a protrusion 6 a formed on the base portion 6 is formed as a through hole provided in the rear surface shroud 2. Both parts are fixed by passing through 2a and heat-welding the tips of the protrusions, for example.

  The operation of the electric blower in the present embodiment configured as described above will be described. When the impeller body 1 rotates, air is sucked from the suction port 10a of the fan case 10. This air flow passes from the region surrounded by the inducer 5, the base 6 and the front shroud 3 to the region surrounded by the blade 4, the front shroud 3 and the base 6.

  Conventionally, the air flow is applied to the blade 4 and at the same time passes through the boundary portion between the base portion 6 and the rear shroud 2, so that the step of the base portion 6 causes air loss and pressure fluctuation due to turbulence, In addition, in the electric blower in the present embodiment, the base 6 extends smoothly to the outer periphery of the rear shroud 2, although there was a considerable amount of air leakage between the rear shroud 2 and the base 6. Since there is no step, there is no loss as in the past.

  In addition, the umbrella-shaped base part 6 usually receives a strong centrifugal force during high-speed rotation, and because of its shape, a force is applied in the direction in which the bottom face of the base part 6 is separated from the rear shroud 2, but in this embodiment, Since the inducer 5 and the rear shroud 2 are fixed by heat welding or the like in the vicinity of the outer periphery, they do not leave even during high-speed rotation, and stable rotation is obtained and high performance is maintained. it can.

  Thus, according to the present embodiment, the outer diameter of the base portion 6 of the inducer 5 is substantially the same as that of the rear surface shroud 2, and the base portion 6 is welded and fixed to the rear surface shroud 2 near the outer periphery. High stability during rotation can be obtained, and air loss inside the impeller body 1 can be suppressed, and an electric blower having high air performance can be provided.

(Embodiment 3)
FIG. 3 is a side sectional view of an impeller body of an electric blower according to a third 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 embodiment, and the description is abbreviate | omitted.

  In FIG. 3, reference numeral 1 denotes an impeller body of the electric blower according to the present embodiment, 2 denotes a rear shroud made of sheet metal, and 3 denotes a front shroud made of sheet metal opposed thereto. Reference numeral 4 denotes a plurality of sheet metal blades provided in the pair of rear surfaces and the front shrouds 2 and 3, and 5 denotes a resin-made three-dimensional curved surface located on the inlet side extension of the blade 4. It is an inducer and is integrally arranged on the base part 6. The rear and front shrouds 2 and 3 facing each blade 4 are joined by caulking. Here, the base portion 6 is extended to a place where the outer diameter thereof coincides with the outer diameter of the rear surface shroud 2. Reference numeral 11 denotes an outer peripheral edge portion that is formed on the base portion 6 and overlaps the outer periphery of the rear surface shroud 2, and has a structure in which the outer periphery of the base portion 6 is not easily deformed during rotation.

The operation of the electric blower in the present embodiment configured as described above will be described. When the impeller body 1 rotates, air is sucked from the suction port 10a of the fan case 10. This air flow passes from the region surrounded by the inducer 5, the base 6 and the front shroud 3 to the region surrounded by the blade 4, the front shroud 3 and the base 6. Conventionally, the air flow is applied to the blade 4 and at the same time passes through the boundary portion between the base portion 6 and the rear shroud 2, so that the step of the base portion 6 causes air loss and pressure fluctuation due to turbulence, The air leakage from between the rear shroud 2 and the base portion 6 occurred to some extent and the loss was large. However, in the impeller body 1 according to the present embodiment, the base portion 6 smoothly reaches the outer periphery of the rear shroud 2. Since it is extended, there is no level difference and no conventional loss occurs.

  In addition, the umbrella-shaped base part 6 usually receives a strong centrifugal force during high-speed rotation, and because of its shape, a force is applied in the direction in which the bottom face of the base part 6 is separated from the rear shroud 2, but in this embodiment, Since the outer peripheral edge portion 11 that overlaps the rear surface shroud 2 is formed on the outer periphery of the base portion 6, the base portion 6 is hardly deformed and is not easily separated from the rear surface shroud 2 even during high-speed rotation. Even if it floats somewhat, there is no joint between the two at the outer peripheral end, so there is no gap and no extra air loss occurs, stable rotation is obtained, and high performance can be maintained.

  As described above, according to the present embodiment, the outer diameter of the base portion 6 of the inducer 5 is substantially the same as that of the rear shroud 2, and the base portion 6 is overlapped with the rear shroud 2. High stability in time can be obtained, air loss in the impeller body 1 can be suppressed, and an electric blower having high air performance can be provided.

(Embodiment 4)
FIG. 4 is a side sectional view of an impeller body of an electric blower according to a fourth embodiment of the present invention, and FIG. 5 is a top view of an inducer of the electric blower. In addition, the same code | symbol is attached | subjected about the same component as the electric blower in the said embodiment, and the description is abbreviate | omitted.

  4 and 5, reference numeral 1 denotes an impeller body of the electric blower according to the present embodiment, 2 denotes a rear shroud made of sheet metal, and 3 denotes a front shroud made of sheet metal opposed to the same. 4 is a plurality of sheet metal blades provided in the pair of rear surfaces, front shrouds 2 and 3, and 5 is a resin inducer having a three-dimensional curved surface located on the inlet side extension of the blade 4. Yes, it is integrally arranged on the base portion 6.

  The rear and front shrouds 2 and 3 facing each blade 4 are joined by caulking. Here, the base portion 6 is extended to a place where the outer diameter thereof coincides with the outer diameter of the rear surface shroud 2. Reference numeral 12 denotes a groove portion formed in the base portion 6 for mounting the blades 4. Square holes 13 through which the caulking protrusions 14 of the blade 4 pass are provided at several positions on the bottom surface of the groove portion 12. And the position of the square hole 2b provided in the rear shroud 2 coincides.

  A portion other than the caulking projection 14 on the bottom surface of the groove portion 12 is a thin portion 15. That is, the blade 4 is fitted into the groove portion 12 of the base portion 6 of the inducer 5, and the caulking protrusion 14 of the blade 4 passes through and is caulked together with the rear shroud 2.

  The operation of the electric blower in the present embodiment configured as described above will be described. When the impeller body 1 rotates, air is sucked from the suction port 10a of the fan case 10. This air flow passes from the region surrounded by the inducer 5, the base portion 6 and the front shroud 3 to the region surrounded by the blade 4, the front shroud 3 and the base portion 6.

  Conventionally, the air flow is applied to the blade 4 and at the same time passes through the boundary portion between the base portion 6 and the rear shroud 2, so that the step of the base portion 6 causes air loss and pressure fluctuation due to turbulence, In the impeller body 1 according to the present embodiment, the base 6 extends smoothly to the outer periphery of the rear shroud 2, although there is a considerable amount of air leakage between the rear shroud 2 and the base 6. Since there is no step, there is no loss as in the past.

  In addition, the umbrella-shaped base part 6 usually receives a strong centrifugal force during high-speed rotation, and because of its shape, a force is applied in the direction in which the bottom face of the base part 6 is separated from the rear shroud 2, but in this embodiment, Since the base portion 6 is sandwiched between the rear surface shroud 2 and crimped by the caulking protrusions 14 of the blade 4, the base portion 6 is not deformed even during high-speed rotation, and the rear surface shroud 2 is not deformed. Will not float from. Therefore, no gap is generated and no extra air loss occurs, so that stable rotation can be obtained and high performance can be maintained.

  As described above, according to the present embodiment, the outer diameter of the base portion 6 of the inducer 5 is made substantially the same as that of the rear surface shroud 2, and further, the base portion 6 is fixed to the rear surface shroud by using the caulking protrusion 14 of the blade 4. By being sandwiched between the two, high stability during high-speed rotation can be obtained, air loss inside the impeller can be suppressed, and an electric blower having high air performance can be provided.

(Embodiment 5)
FIG. 6 is a sectional side view of the fan portion of the electric blower according to the fifth 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 embodiment, and the description is abbreviate | omitted.

  In FIG. 6, 1 is an impeller body of the electric blower of the present invention. Reference numeral 2 denotes a rear shroud made of sheet metal, and reference numeral 3 denotes a front shroud made of sheet metal facing the shroud. Reference numeral 4 denotes a plurality of sheet metal blades provided in the pair of rear surfaces and the front shrouds 2 and 3, and 5 denotes a resin-made three-dimensional curved surface located on the inlet side extension of the blade 4. It is an inducer and is integrally arranged on the base part 6.

  The rear and front shrouds 2 and 3 facing each blade 4 are joined by caulking. Here, the base portion 6 extends so that the outer diameter thereof coincides with the outer diameter of the rear shroud 2.

  Reference numeral 11 denotes an outer peripheral edge portion for overlapping the outer periphery of the rear shroud 2 formed on the base portion 6, and has a structure in which the outer periphery of the base portion 6 is not easily deformed during rotation. Reference numeral 16 denotes an extremely fine convex rib integrally formed on the outermost periphery of the base portion 6, and the tip thereof is set to the last dimension that comes into contact with the air guide 9.

  The operation of the electric blower in the present embodiment configured as described above will be described.

  When the impeller body 1 rotates, air is sucked from the suction port 10 a of the fan case 10. This air flow passes from the region surrounded by the inducer 5, the base 6 and the front shroud 3 to the region surrounded by the blade 4, the front shroud 3 and the base 6.

  Conventionally, the air flow is applied to the blade 4 and at the same time passes through the boundary portion between the base portion 6 and the rear shroud 2, so that the step of the base portion 6 causes air loss and pressure fluctuation due to turbulence, The air leakage from between the rear shroud 2 and the base portion 6 occurred to some extent and the loss was large. However, in the impeller body 1 according to the present embodiment, the base portion 6 smoothly reaches the outer periphery of the rear shroud 2. Since it is extended, there is no level difference and no conventional loss occurs.

In addition, the umbrella-shaped base part 6 usually receives a strong centrifugal force during high-speed rotation, and due to its shape, the base part 6 bottom surface is subjected to a force in a direction away from the rear shroud 2, but in this embodiment, Since the outer peripheral edge portion 11 that overlaps the rear surface shroud 2 is formed on the outer periphery of the base portion 6, the base portion 6 is hardly deformed and is not easily separated from the rear surface shroud 2 even during high-speed rotation.

  Even if it floats somewhat, there is no joint between the two at the outer peripheral edge, and no gap is generated and no extra air loss occurs, so that stable rotation can be obtained and high performance can be maintained.

  Further, a convex rib 16 is formed on the outer periphery of the base portion 6 so as to close a gap between the air guide 9 and the base portion 6. The convex ribs 16 are as thin as burrs and do not overload the rotation even if they contact the air guide 9. Conventionally, when the airflow discharged from the impeller body 1 enters the air guide 9, a part of the leakage flow from the gap between the impeller body 1 and the air guide 9 to the lower portion of the impeller body 1 is generated, resulting in a loss. In the embodiment, the presence of the convex rib 16 causes less leakage, and almost all of the flow enters the air guide 9, so that the loss is reduced.

  As described above, according to the present embodiment, the outer diameter of the base portion 6 of the inducer 5 is substantially the same as that of the rear shroud 2, and the base portion 6 is overlapped with the rear shroud 2. It is possible to provide an electric blower with high air performance as well as high stability at the time, less leakage flow from the gap between the impeller 1 and the air guide 9, and suppressing air loss at the same part. is there.

  Needless to say, if the electric blower excellent in air performance described in the above embodiment is used in a vacuum cleaner, a vacuum cleaner having high suction performance can be provided.

  As described above, since the electric blower according to the present invention and the electric vacuum cleaner using the electric blower can improve the efficiency of the electric blower and the suction work rate of the electric vacuum cleaner, the household electric appliance using the electric blower It can be applied to a wide range of applications such as industrial equipment.

Side sectional view of the impeller body of the electric blower in the first embodiment of the present invention Side sectional view of the impeller body of the electric blower in the second embodiment of the present invention Side sectional view of the impeller body of the electric blower in the third embodiment of the present invention Side sectional view of the impeller body of the electric blower in the fourth embodiment of the present invention Top view of the inducer of the electric blower Sectional side view of the fan part of the electric blower in the 5th Embodiment of this invention Half sectional view of a conventional electric blower Perspective view of impeller of same electric blower Side sectional view of the impeller

DESCRIPTION OF SYMBOLS 1 Impeller main body 2 Rear surface shroud 3 Front shroud 3a Inlet 4 Blade 5 Inducer 5a Blade 6 Base part 7 Thin flat part 8 Motor 9 Air guide 10 Fan case 11 Outer peripheral edge part 12 Groove part 13 Square hole 14 Caulking protrusion 15 Thin part 16 Convex ribs

Claims (6)

An impeller body, an air guide arranged on the outer periphery of the impeller body to regulate an air flow discharged from the impeller body and guiding it downstream, a fan including the impeller body and the air guide and having a suction port in the center In the electric blower including a case and a motor that rotationally drives the impeller body, the impeller body is provided in a front shroud having an air inlet in the center, a rear shroud facing the front shroud, and a central portion of the rear shroud. An inducer comprising a plurality of blades on a substantially convex base portion, and a plurality of blades disposed on an outer periphery of the inducer, and the inducer between the front shroud and the rear shroud. And the blade is sandwiched, the outer diameter of the base portion is substantially the same as the outer diameter of the rear shroud Electric blower that. The electric blower according to claim 1, wherein the vicinity of the outer periphery of the base portion is welded and fixed to the rear shroud. The electric blower according to claim 1 or 2, wherein an outer periphery of the base portion overlaps with an outer peripheral portion of the rear shroud. The groove part for inserting a some braid | blade is provided in the base | substrate part, The square hole which inserts the protrusion for the crimping | compression-bonding of the said blade was provided in the bottom face of the said groove part. Electric blower. The electric motor according to any one of claims 1 to 4, wherein an extremely fine convex rib is formed on the outer periphery of the base portion over the entire circumference, and a tip of the convex rib is brought close to an inner wall of the air guide. Blower. The vacuum cleaner provided with the electric blower of any one of Claims 1-5.