JP3718996B2 - Electric blower - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric blower used for a vacuum cleaner or the like.
[0002]
[Prior art]
In recent years, vacuum cleaners are required to have a high output, and have a tendency to be smaller and lighter.
[0003]
Hereinafter, a conventional electric blower will be described with reference to FIGS.
[0004]
FIG. 7 is a partially cutaway sectional view of the impeller, fan case, and motor. In FIG. 7, 1 is an impeller. 2 is a resin rear shroud, 3 is a resin front shroud facing the resin shroud, 4 is a plurality of resin blades provided in the pair of shrouds, and is molded integrally with the rear shroud 2. Further, it is fixed to the front shroud 3 by welding. Reference numeral 5 denotes a motor for driving the impeller 1, and reference numeral 6 denotes an air guide. Reference numeral 7 denotes a fan case including the impeller 1 and the air guide 6 and having an air inlet 8 in the center portion which is airtightly attached to the outer periphery of the motor 5.
[0005]
The operation in the above configuration will be described. The impeller 1 rotates at high speed, and an air flow is sucked from the intake port 8 of the impeller 1 and discharged from the outer periphery of the impeller 1. Further, the air flow passes through the air guide 6 and is discharged into the motor 5.
[0006]
Here, the shape of the conventional impeller 1 is generally such that the rear shroud 2 integrated with the blade 4 is a flat plate, while the front shroud 3 facing it has an umbrella shape.
[0007]
[Problems to be solved by the invention]
However, the importance of the strength of the resin impeller 1 itself and the welding strength of the blade 4 and the shroud is increasing in the recent reduction in size and weight of the electric blower, that is, speeding up. In the conventional umbrella shape, when the impeller 1 is rotated at a high speed, as shown by a broken line in FIG. 8, the outer peripheral portion tends to bend toward the side opposite to the motor 5 side, that is, the intake port 8 side by centrifugal force. Therefore, depending on the material of the resin or molding conditions, the strength of each part of the impeller 1 is not strong and there is a risk of causing breakage. In the case of the resin impeller 1, the blade 4 and the front shroud 3 are joined by ultrasonic welding or the like. The joining force is inferior to the caulking force of the metal impeller, and the impeller 1 may be decomposed. It was.
[0008]
An object of the present invention is to provide an electric blower including a highly reliable resin impeller that can withstand high-speed rotation by eliminating breakage due to the above-described deformation of the resin impeller 1.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises a rear shroud fixed to a rotating shaft of a motor, a front shroud opposed to the rear shroud, and a plurality of blades provided between the shrouds. The shape of the meridional surface of both shrouds excluding the air inlet portion of the shroud is configured so that the opposing shrouds are symmetrical with each other, and the centrifugal force applied to both the front and rear shrouds is approximately equally symmetrical with both shrouds. Electric blower equipped with a resin impeller with a structure that is subjected to a load , prevents deformation due to centrifugal force of the impeller during rotation, is resistant to breakage, etc., and is equipped with a highly reliable resin impeller Is to provide.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention includes a rear shroud fixed to a rotating shaft of a motor, a front shroud facing the rear shroud, and a plurality of blades provided between the shrouds. The shape of the meridional surfaces of both shrouds excluding the air inlet of the shroud is configured so that the opposing shrouds are symmetrical with each other, and the centrifugal force applied to both the front and rear shrouds is approximately equally symmetrical with both shrouds. to have as an electric blower having a resin impeller and load such a configuration, to prevent deformation due to centrifugal force during rotation of the impeller, resistant to destruction, with reliable resin impeller electric A blower is provided.
[0011]
The invention according to claim 2 of the present invention is such that the shape of the meridian surfaces of both shrouds is such that the centrifugal force applied to both shrouds is a parallel shape in which a load is applied almost equally and symmetrically to both shrouds. Therefore , both shrouds are not deformed in the axial direction of the motor, and an electric blower including a high-strength impeller is obtained.
[0012]
The invention according to claim 3 of the present invention includes a rear shroud fixed to a rotating shaft of a motor, a front shroud facing the rear shroud, and a plurality of blades provided between the shrouds. The meridian shape of both shrouds excluding the air inlet of the shroud is provided with a resin impeller configured such that the opening gradually decreases toward the outer periphery of the impeller and the opposing shrouds are symmetrical with each other. As an electric blower.
[0013]
The invention according to claim 4 of the present invention is such that the shape of the meridian surface of both shrouds excluding the air inlet portion of the front shroud is gradually increased toward the outer peripheral portion of the impeller , and the opposed shroud Since they are symmetrical with each other, both shrouds tend to be deformed toward the blade side by centrifugal force, so that an electric blower equipped with an impeller that is strong against disassembly can be obtained.
[0014]
The invention according to claim 5 of the present invention includes a rear shroud fixed to a rotating shaft of a motor, a front shroud opposed to the rear shroud, and a plurality of blades provided between the shrouds. Since the weight is attached to the outer periphery of the shroud to suppress the deformation of the impeller during rotation, only the center of gravity of the impeller can be moved to the rear shroud side with approximately the conventional shape, and the intake of the outer periphery It is possible to provide an electric blower equipped with a highly reliable resin impeller that suppresses deformation to the mouth side, is strong against breakage, and the like.
[0015]
In the invention according to claim 6 of the present invention, since the thick portion is provided on the outer peripheral portion of the rear shroud, the electric blower provided with the impeller that can move the center of gravity to the rear shroud side and is less deformed by centrifugal force can be provided. Is.
[0016]
In the invention according to claim 7 of the present invention, since a plurality of blades provided between both shrouds are provided with thick portions, both the shrouds have the same shape as before and only the center of gravity moves to the rear shroud side. It is possible to obtain an electric blower including an impeller that is less deformed by centrifugal force.
[0017]
【Example】
(Example 1)
A first embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a cross-sectional view showing the shape of a meridian plane obtained by cutting a resin impeller along a plane including a rotating shaft 108 of a motor. In FIG. 1, 101 is a resin impeller, 102 is a resin rear shroud, 103 is a resin front shroud facing it, and the opposing shrouds are configured symmetrically with each other. Reference numeral 104 denotes a resin blade provided in the pair of shrouds and formed integrally with the rear shroud 102, and each blade and the front shroud 103 are joined by ultrasonic welding.
[0018]
The operation in the above configuration will be described. The impeller 101 rotates at a high speed and sucks an air flow from the intake port 105 of the impeller 101. This air flow passes through an internal passage surrounded by the rear shroud 102, the front shroud 103, and the blade 104. Then, the impeller 101 is discharged from the outer periphery. At this time, centrifugal force proportional to the square of the peripheral speed is applied to the impeller 101. However, since the shape of the meridian surface of the impeller 101 is configured symmetrically, both shrouds are almost equally symmetrically loaded. The forces cancel each other, and the deformation of the impeller 101 is suppressed.
[0019]
As described above, according to the impeller for the electric blower of the present embodiment, since the shapes of the front and rear shrouds 102 and 103 are symmetric, the centrifugal force applied to the impeller 101 is also symmetric with both shrouds, and distortion of the impeller 101 is suppressed. Thus, an electric blower including a resin impeller having excellent strength that is strong against breakage and decomposition can be obtained.
[0020]
The blade 104 can be integrally formed with the front shroud 103 and welded to the rear shroud 102 to obtain the same effect.
[0021]
(Example 2)
Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. FIG. 2 is a cross-sectional view showing the shape of the meridian surface of the resin impeller. Reference numeral 102 denotes a resin rear shroud, and reference numeral 103 denotes a resin front shroud facing the resin shroud. The opposing shrouds are arranged symmetrically and in parallel with each other.
[0022]
In the above configuration, when the impeller 101 rotates at a high speed, centrifugal force proportional to the square of the circumferential speed is applied to the impeller 101. However, since the meridian shape of the impeller 101 is configured symmetrically and in parallel, both shrouds Both 102 and 103 are not easily deformed in the direction of the rotation axis (not shown) of the motor, and the spreading direction of the surfaces of both shrouds 102 and 103 coincides with the direction of centrifugal force. The welding of the blade 104 is difficult to peel off.
[0023]
As described above, according to the impeller for the electric blower of the present embodiment, by arranging the shrouds 102 and 103 in parallel with each other, deformation of the resin impeller due to centrifugal force can be suppressed, and the strength of the welded portion can be increased. Is.
[0024]
(Example 3)
Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. FIG. 3 is a cross-sectional view showing the shape of the meridian surface of the resin impeller. 102 is a rear shroud made of resin, and 103 is a front shroud made of resin facing the resin. The meridian shape of both shrouds 102 and 103 is configured such that the opening gradually increases toward the outer peripheral portion of the impeller 101. Has been.
[0025]
In the above configuration, when the impeller 101 rotates at a high speed, a centrifugal force proportional to the square of the peripheral speed is applied to the impeller 101. However, since the meridian shape of the impeller 101 is configured symmetrically, both shrouds are deformed. It is hard to receive. Further, each shroud tends to deform in the direction in which the blade exists, that is, in the direction in which the bonding to the blade is strengthened against the centrifugal force, and the impeller is prevented from being decomposed from the welded portion.
[0026]
As described above, according to the impeller for an electric blower of the present embodiment, the meridian shape of both shrouds 102 and 103 is configured so that the opening gradually increases toward the outer peripheral portion of the impeller 101. It is possible to suppress the deformation of the impeller due to the above and the decomposition of the resin impeller from the welded portion.
[0027]
(Example 4)
Next, a fourth embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. FIG. 4 is a cross-sectional view showing the shape of the meridian surface of the resin impeller. Reference numeral 102 denotes a resin flat plate rear surface shroud, and 103 denotes an umbrella-shaped resin front shroud facing the resin. A weight 106 having an appropriate weight is attached to the outer periphery of the rear shroud 102.
[0028]
In the above configuration, when the impeller 101 rotates at a high speed, a centrifugal force proportional to the square of the circumferential speed is applied to the impeller 101, but a weight 106 with an appropriate load is attached to the outer peripheral portion of the rear shroud 102. The center of gravity of the impeller 101 moves to the rear surface shroud 102 side, and deformation of the outer peripheral portion toward the intake port 105 side can be suppressed.
[0029]
As described above, according to the electric blower impeller of the present embodiment, the weight 106 for controlling the center of gravity of the impeller 101 is attached to the outer peripheral portion of the rear shroud 102, whereby the center of gravity of the entire impeller 101 is moved to the rear shroud 102 side. And since the deformation | transformation of the impeller 101 whole can be suppressed, the electric blower with a resin impeller strong against destruction etc. can be provided. Further, since the shape of the impeller 101 is almost the same as that of the conventional umbrella shape, it is advantageous that the conventional design guideline can be used as it is when the impeller 101 is designed.
[0030]
(Example 5)
Next, a fifth embodiment of the present invention will be described with reference to FIG. The same components as those in the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted. FIG. 5 is a cross-sectional view showing the shape of the meridian surface of the resin impeller. 102 is a resin rear shroud, and 103 is an umbrella-shaped resin front shroud facing the resin. A thick portion 107 is provided on the outer periphery of the rear shroud 102 by integral molding.
[0031]
In the above configuration, when the impeller 101 rotates at a high speed, a centrifugal force proportional to the square of the peripheral speed is applied to the impeller 101. However, since the thick portion 107 is provided on the outer peripheral portion of the rear shroud 102, the impeller 101 The center of gravity of the impeller 101 moves toward the rear shroud 102, and deformation of the outer peripheral portion of the impeller 101 toward the intake port 105 is suppressed.
[0032]
As described above, according to the impeller for an electric blower of the present embodiment, the thick portion 107 is formed by integral molding on the outer peripheral portion of the rear shroud 102, thereby moving the center of gravity of the entire impeller 101 toward the rear shroud 102. The electric blower having a resin impeller that can suppress deformation of the impeller 101 and is strong against breakage or the like can be provided. Further, since the thick portion is formed integrally with the impeller 101, the entire impeller 101 can be easily balanced, and the number of parts and man-hours can be reduced.
[0033]
(Example 6)
Next, a sixth embodiment of the present invention will be described with reference to FIG. The same components as those in the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted. FIG. 6A is a cross-sectional view showing the shape of the meridian surface of the resin impeller. 102 is a resin rear shroud, and 103 is an umbrella-shaped resin front shroud facing the resin. Reference numeral 104 denotes a resin blade provided in the pair of shrouds and molded integrally with the rear shroud 102. (B) shows a cross section of the blade, and a thick portion 107 is formed on the rear shroud 102 side.
[0034]
In the above configuration, when the impeller 101 rotates at a high speed, a centrifugal force proportional to the square of the peripheral speed is applied to the impeller 101. However, since the thick portion 107 is formed on the rear surface shroud 102 side of the blade 104, the impeller The center of gravity of 101 is further moved toward the rear shroud 102, and deformation of the outer peripheral portion toward the inlet 105 is suppressed.
[0035]
As described above, according to the impeller for an electric blower of the present embodiment, by providing the thick portion 107 on the blade 104, the center of gravity of the entire impeller 101 can be moved toward the rear shroud 102, and deformation of the impeller 101 can be suppressed. Impellers that are strong against breakage and the like are obtained. Further, since the front and rear shrouds 102 and 103 are exactly the same as the conventional shape, it is not necessary to consider interference with an air guide (not shown).
[0036]
【The invention's effect】
According to the first aspect of the present invention, the centrifugal force applied to the front and rear shrouds with the shape of both the front and rear shrouds of the impeller of the electric blower being symmetrical is almost equally symmetrically loaded. With this configuration, the centrifugal force applied to the impeller is also symmetric with both shrouds, and the forces cancel each other out, so the deformation of the impeller during high-speed rotation is suppressed, and the resin has excellent strength strong against breakage and decomposition An electric blower equipped with an impeller can be obtained.
[0037]
The invention according to claim 2 of the present invention is such that the arrangement of the front and rear shrouds is parallel to each other, and the centrifugal force applied to both shrouds has a parallel shape in which both the shrouds are symmetrically and symmetrically loaded. Further, it is possible to eliminate the deformation of both shrouds in the motor axial direction due to the centrifugal force, and to thereby obtain an impeller that is unlikely to be decomposed from the welded portion.
[0038]
The invention according to claim 3 of the present invention is such that the shape of the meridional surface of both shrouds excluding the air inlet portion of the front shroud is gradually reduced toward the outer periphery of the impeller, and the shrouds facing each other. By adopting a configuration that is symmetrical to each other, it is possible to obtain an electric blower including a resin impeller having excellent strength that is strong against breakage and decomposition.
[0039]
According to a fourth aspect of the present invention, the meridian shape of both the front and rear shrouds is configured such that the opening gradually increases toward the outer periphery of the impeller, thereby suppressing the deformation of the impeller due to centrifugal force. In addition to being able to do so, both shrouds try to deform in the direction in which the blades exist due to centrifugal force, and the joint force during rotation is further increased, providing a strong impeller against breakage and disassembly.
[0040]
In the invention according to claim 5 of the present invention, by attaching a weight for controlling the center of gravity of the impeller to the outer peripheral portion of the rear shroud, the center of gravity of the entire impeller is moved to the rear shroud side, thereby suppressing the deformation of the impeller. It is possible to provide an electric blower having an impeller that is strong against breakage and the like.
[0041]
In the invention according to claim 6 of the present invention, the center of gravity of the entire impeller is moved to the rear shroud side by molding the thick portion on the outer peripheral portion of the rear shroud, so that the deformation of the impeller can be suppressed, broken, etc. As a result, the balance is easy to adjust and the number of parts is reduced.
[0042]
In the invention according to claim 7 of the present invention, by forming the thick portion on the rear shroud side of the blade, the center of gravity of the entire impeller is moved to the rear shroud side, the deformation of the entire impeller is suppressed, and destruction, decomposition, etc. A strong impeller can be obtained. In addition, since the shape of the front and rear shrouds is not different from the conventional one, the basic design of the air guide can be performed as usual.
[0043]
In addition, as an effect common to claims 1 to 7 of the present invention, by suppressing deformation of the impeller during rotation, most of the air flow discharged from the impeller is guided to the air guide without leaking. There is no concern that the front shroud hits the fan case, and the efficiency of the motor shaft output to the air output of the electric blower can be increased, and the reliability as the electric blower is improved.
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view showing a fan portion of an electric blower showing a first embodiment of the present invention. FIG. 2 is a sectional view of an impeller for an electric blower showing a second embodiment of the present invention. 3 is a sectional view of an impeller for an electric blower showing a third embodiment of the present invention. FIG. 4 is a sectional view of an impeller for an electric blower showing a fourth embodiment of the present invention. Cross-sectional view of an impeller for an electric blower showing an embodiment FIG. 6 (a) Cross-sectional view of an impeller for an electric blower showing a sixth embodiment of the present invention (b) Cross-sectional view taken along line AA in FIG. FIG. 7 is a partially omitted side view of a conventional electric blower. FIG. 8 is a partially omitted side view showing a fan portion of a conventional electric blower.
101 Impeller 102 Rear shroud 103 Front shroud 104 Blade 105 Motor 106 Air inlet

Claims (7)

A rear shroud fixed to the rotating shaft of the motor; a front shroud opposed to the rear shroud; and a plurality of blades provided between the shrouds; and the meridians of the shrouds excluding the air inlet of the front shroud. The surface shape of the resin impeller is configured such that the opposing shrouds are symmetrical with each other, and the centrifugal force applied to both the front and rear shrouds is applied to the shrouds almost equally and symmetrically. Electric blower provided. The electric blower according to claim 1, further comprising a resin impeller having a parallel shape in which the meridional surfaces of both shrouds are subjected to centrifugal force applied to the shrouds so that the loads are applied to the shrouds almost equally and symmetrically . A rear shroud fixed to the rotating shaft of the motor; a front shroud opposed to the rear shroud; and a plurality of blades provided between the shrouds; and the meridians of the shrouds excluding the air inlet of the front shroud. An electric blower provided with a resin impeller having a configuration in which the opening gradually becomes smaller toward the outer periphery of the impeller and the shrouds are opposed to each other . A rear shroud fixed to the rotating shaft of the motor; a front shroud opposed to the rear shroud; and a plurality of blades provided between the shrouds; and the meridians of the shrouds excluding the air inlet of the front shroud. An electric blower provided with a resin impeller having a configuration in which the opening gradually increases in size toward the outer periphery of the impeller and is symmetric between opposing shrouds .   A rear shroud fixed to the rotating shaft of the motor, a front shroud opposed to the rear shroud, and a plurality of blades provided between the shrouds, and an outer periphery of the rear shroud An electric blower provided with a resin impeller with a weight attached so as to suppress deformation. The electric blower according to claim 5, further comprising a resin impeller provided with a thick wall portion on an outer peripheral portion of the rear shroud. The electric blower according to claim 5 , wherein a plurality of blades provided between the shrouds are provided with a resin impeller provided with a thick portion.

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