JP2006161803A - Impeller for vacuum cleaner and motor assembly body having it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an impeller for a vacuum cleaner capable of reducing noise at a peak value in a scope of frequency of 8 to 10 KHz and to provide a motor assembly body having it. <P>SOLUTION: This impeller for the vacuum cleaner includes a disc-like lower plate, an upper plate arranged at predetermined distance from the lower plate, having the same diameter as that of the lower plate, and forming an air suction port at the center, and a plurality of air guide members arranged radially between the upper plate and the lower plate and having chamfered both corner parts at an outer side end. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an impeller for a vacuum cleaner and a motor assembly having the same.

  Generally, a vacuum cleaner is a device that generates partial vacuum and collects dust and the like by this. Accordingly, the vacuum cleaner includes a motor assembly for generating a partial vacuum. Partial evacuation occurs when air is sucked in by an impeller that rotates as the motor rotates.

  FIG. 1 attached herewith is a schematic sectional view of a motor assembly according to the prior art, and FIG. 2 is a perspective view showing an impeller in FIG.

  As shown in FIGS. 1 and 2, the motor assembly 1 according to the related art includes a motor 10, an impeller 20 that rotates as the motor 10 rotates, and a diffuser that guides air sucked by the impeller 20 to the motor 10 side. 30.

  The impeller 20 includes a lower plate 21, an upper plate 22, and a plurality of air guide members 23. The lower plate 21 has a disk shape and is supported by the motor shaft 11 of the motor 10. The upper plate 22 has a disk shape corresponding to the lower plate 21 and is shaped to have substantially the same diameter as the lower plate 21. In the center of the upper plate 22, an air suction port 25 through which air is sucked is provided. The plurality of air guide members 23 are radially arranged at equal intervals between the upper plate 22 and the lower plate 21. Each air guide member 23 is usually formed in a curved strip shape having a predetermined curvature. At this time, one end 23a of the air guide member 23 positioned on the outer peripheral side of the lower plate 21 and the upper plate 22 has both corners formed at right angles. Further, the length of the air guide member 23 is such that one end 23 a of the air guide member 23 is located on the back side from the outer periphery of the upper plate 22 and the lower plate 21, and the other end is located outside the air suction port 25 of the upper plate 22. It only needs to have a length to be positioned.

  The diffuser 30 is disposed on the upper end of the motor 10 concentrically with the impeller 20 at a predetermined interval so that the impeller 20 can rotate outside the impeller 20. The diffuser 30 is provided with a plurality of guide members that guide the air sucked into and discharged from the impeller 20 to the motor 10 side.

  The operation of the conventional motor assembly having the above configuration will be described with reference to FIGS.

  When the motor 10 of the motor assembly 1 rotates, the impeller 20 rotates in conjunction with the rotation of the lower plate 21 of the impeller 20 that is supported by the motor shaft 11 and rotates as the motor shaft 11 rotates. . When the impeller 20 rotates, air containing dust or dust is sucked from a dust suction port of a suction brush (not shown) communicating with the air suction port 25 of the upper plate 22 of the impeller. The dust contained in the air is removed while passing through a dust collection unit in a dust collection chamber (not shown), and only clean air is drawn from the air inlet 25 of the impeller 20. The air drawn from the air suction port 25 flows along the plurality of air guide members 23 and is discharged to the diffuser 30 side. The air discharged to the diffuser 30 side cools the motor 10 and is discharged from the discharge port of the main body (not shown) to the outside of the cleaner.

  However, a vacuum cleaner that collects dust and the like by using the air suction force of this type of motor assembly 1 has a problem that a considerably large noise is generated by the motor 10 that rotates at high speed. In order to reduce such noise, various methods have been devised and used, such as changing the flow path of air exhausted from the motor assembly and attaching a sound absorbing member. It has not yet been reduced. In particular, in order to eliminate the user's discomfort during cleaning, it is necessary to reduce noise having a peak value in the frequency range of 8 to 10 KHz among noises generated when the impeller 20 of the motor assembly 1 rotates.

  The present invention has been made to solve the above-described problems, and its object is to reduce the noise in the frequency range of 8 to 10 KHz from the noise generated during the rotation of the impeller and the overall noise. The object is to provide an impeller for a vacuum cleaner that can reduce noise.

  Another object of the present invention is to provide a motor assembly having a cleaner impeller as described above so that the noise of the cleaner can be reduced.

  An object of the present invention as described above is a disc-shaped lower plate and a predetermined distance from the lower plate, and has the same diameter as the lower plate, and an air inlet is formed in the center. It is achieved by providing an impeller for a vacuum cleaner that includes an upper plate, and a plurality of air guide members that are radially disposed between the upper plate and the lower plate and chamfered at both corners of the outer end. The

  At this time, it is preferable that the chamfering satisfies the following formula.

  Here, B represents the length of the chamfered air guide member in the width direction, and C represents the width of the air guide member.

  The plurality of air guide members are caulked and joined to the upper plate and the lower plate.

  The chamfering is preferably processed in a range in which the chamfering length in the longitudinal direction of the air guide member is smaller than the position of the caulking portion of the outermost contour of the caulking joint. Alternatively, the chamfer length in the longitudinal direction is preferably 1.5 to 3 mm.

  As another aspect of the present invention, the object of the present invention as described above is to provide a plurality of disc-shaped lower plates and a plurality of chamfered outer corners disposed radially on the lower plate. An air guide member, and an upper plate disposed on the upper side of the plurality of air guide members, having a diameter corresponding to a chamfering start point of the plurality of air guide members, and having an air suction port formed in the center thereof; This can be achieved by providing a vacuum cleaner impeller including:

  As another aspect of the present invention, the above-described object of the present invention is to provide a motor, a disk-shaped lower plate that is pivotally supported by the motor shaft of the motor, and a predetermined distance from the lower plate. The upper plate, which has the same diameter as the lower plate and has an air suction port formed in the center, is arranged radially between the upper plate and the lower plate, and both corners of the outer end are chamfered. This is achieved by providing a motor assembly for a vacuum cleaner including an impeller including a plurality of air guide members and a diffuser disposed at an upper end of the motor and guiding air sucked from the impeller to the motor side. Is done.

  At this time, it is preferable that the chamfering satisfies the following formula.

  Here, B represents the length of the air guide member in the width direction, and C represents the width of the air guide member.

  Further, the plurality of air guide members are caulked and joined to the upper plate and the lower plate, and in this case, the chamfering has a chamfer length in the longitudinal direction of the air guiding member of an outermost caulking portion of the caulking joint. It is processed in a range smaller than the position. Alternatively, the chamfer length in the longitudinal direction is processed in the range of 1.5 to 3 mm.

  As a further aspect of the present invention, the object of the present invention as described above is to provide a motor, a disk-shaped lower plate, and a radial upper side of the lower plate, and both corners of the outer end are chamfered. A plurality of air guide members and an air suction port formed at the center and having a diameter corresponding to a start point of chamfering of the plurality of air guide members. This is achieved by providing a motor assembly for a vacuum cleaner including an impeller including a plate, and a diffuser disposed at an upper end of the motor and guiding air sucked from the impeller to the motor side.

  At this time, the chamfering has a chamfering length in the longitudinal direction of the air guide member from a distance to a caulking part located at the outermost contour among the caulking parts where the lower plate and the plurality of air guiding members are caulked and joined. It is preferable to process in a small range.

  As a still further aspect of the present invention, the above-described object of the present invention is to provide a suction brush, a dust collection unit that communicates with the suction brush and collects dust, and a motor that communicates with the dust collection unit and generates a suction force. In the vacuum cleaner including the assembly, the motor assembly is disposed at a predetermined distance from the motor, a disk-shaped lower plate that is pivotally supported by the motor shaft of the motor, and the lower plate. A plurality of upper plates having the same diameter as the lower plate and having an air suction port formed in the center, and radially disposed between the upper plate and the lower plate, and both corners of the outer end being chamfered. This is achieved by providing a vacuum cleaner including an impeller including an air guide member, and a diffuser disposed at an upper end of the motor and guiding air sucked from the impeller to the motor side.

  As described above, according to the impeller for a vacuum cleaner according to the present invention, the noise of the peak value in the frequency range of 8 to 10 KHz and the noise in the entire frequency range during the rotation of the impeller are reduced as compared with that of the conventional impeller. can do.

  In addition, according to the motor assembly for a vacuum cleaner having an impeller according to the present invention, the noise in the peak value in the frequency range of 8 to 10 KHz and the noise in the entire frequency range during the rotation of the motor It can reduce compared with it.

  In particular, according to the vacuum cleaner provided with the motor assembly according to the present invention, the noise in the peak value in the frequency range of 8 to 10 KHz and the noise in the entire frequency range are reduced compared to that of the conventional vacuum cleaner, so that Can be cleaned in a safe state.

  First, an experiment was conducted to find out where the noise source is in order to reduce the noise generated during the rotation of the impeller, particularly the noise in the peak value in the frequency range of 8 to 10 KHz. The result will be described with reference to FIG. 3 and FIG.

  Through the computer simulation, the flow analysis was performed while rotating the impeller 20 inside the diffuser 30 as shown in FIG. The result is shown in FIG. Referring to FIG. 4, it can be seen that the outer ends 23 a of the plurality of air guide members 23 have a triangular tail 23 b. The triangular tail 23 b represents a force applied to the outer ends 23 a of the plurality of air guide members 23. Thus, it can be seen that noise generated when the impeller 20 rotates is generated from the outer ends 23 a of the plurality of air guide members 23 of the impeller 20. This can be interpreted as occurring due to the interaction between the outer end 23a of the air guide member 23 of the impeller 20 and the guide member 31 of the diffuser 30 when the impeller 20 rotates inside the diffuser 30 as shown in FIG. it can. That is, it can be determined that the noise source when the impeller 20 rotates is the outer ends 23 a of the plurality of air guide members 23.

  Accordingly, the present invention changes the shape of the outer end 23a of the air guide member 23 and the diameter of the upper plate of the impeller in order to reduce noise during rotation of the impeller 20, particularly noise having a peak value in the frequency range of 8 to 10 KHz. I came to find it.

  Hereinafter, embodiments of the impeller for a vacuum cleaner according to the present invention will be described with reference to the accompanying drawings.

  FIG. 5 is a perspective view of a first embodiment of a vacuum cleaner impeller according to the present invention, and FIG. 6 is a side view of the vacuum cleaner impeller of FIG.

  Referring to FIGS. 5 and 6, the cleaner impeller 110 according to the first embodiment of the present invention includes a lower plate 111, an upper plate 112, and a plurality of air guide members 113.

  The lower plate 111 has a disk shape, and is supported by a motor shaft of a motor (not shown) penetrating the center. The upper plate 112 has a disk shape corresponding to the lower plate 111 and has substantially the same diameter as the lower plate 111. In the center of the upper plate 112, an air suction port 115 through which air is sucked is provided. The air suction port 115 is preferably provided at a predetermined height from the upper plate 112. At this time, the connecting portion 114 between the air suction port 115 and the upper plate 112 is formed in a curved shape having a predetermined curvature so that the sucked air flows smoothly. The plurality of air guide members 113 are radially arranged at equal intervals between the upper plate 112 and the lower plate 111. Each air guide member 113 is usually formed into a curved strip having a predetermined curvature. Each air guide member 113 is coupled to the upper plate 112 and the lower plate 111 by various coupling members. In the case of the present embodiment, each air guide member 113 is coupled to the upper plate 112 and the lower plate 111 by caulking joint 116. At this time, both corners 113c of the one end 113a of the air guide member 113 located on the outer peripheral side of the lower plate 111 and the upper plate 112 are chamfered. This chamfering process is preferably performed within the following range.

  FIG. 7 is a view for explaining chamfering of the air guide member. As shown in FIG. 7, the length A of the chamfer 113c in the longitudinal direction of the air guide member 113 (hereinafter referred to as “the length of the chamfer in the longitudinal direction”) is the maximum, and the upper plate 112, the lower plate 111, and the air It is preferable to have a range shorter than the distance from the outermost joints 116 a and 116 b of the caulking joint 116 that joins the guide member 113 to the one end 113 a of the air guide member 113. Alternatively, the length A in the longitudinal direction of the chamfer 113c is preferably within a range of 1.5 to 3 mm from the corner 113d before chamfering. The length B of the chamfer 113c in the width direction of the air guide member 113 (hereinafter referred to as “the length of the chamfer in the width direction”) preferably satisfies the following formula.

  Here, B represents the length of the chamfer 113c in the width direction, and C represents the width of the air guide member 113.

  Further, the length of the air guide member 113 is such that one end 113a of the air guide member 113 is located on the back side from the outer periphery of the upper plate 112 and the lower plate 111, and the other end is located outside the air suction port 115 of the upper plate 112. It only needs to have a length to be positioned.

  The action of the cleaner impeller 110 configured as described above will be described together with the action of the cleaner motor assembly described later.

  FIG. 8 is a cross-sectional view showing an embodiment of a motor assembly for a vacuum cleaner having an impeller according to the first embodiment of the present invention.

  As shown in FIG. 8, the vacuum cleaner motor assembly 100 having the impeller according to the first embodiment of the present invention is sucked by the motor 101, the impeller 110 that rotates as the motor 101 rotates, and the impeller 110. And a diffuser 120 that guides the air to the motor 101 side.

  The motor 101 may be of any type as long as it is a motor having a rotational speed of 3,000 to 3,600 rpm that is generally used in a vacuum cleaner. In this embodiment, the motor 101 is a universal motor having a speed of 3,000 rpm. A motor was used. Here, the motor used in the present embodiment does not limit the scope of rights of the present invention.

  The impeller 110 includes a lower plate 111, an upper plate 112, and a plurality of air guide members 113. As shown in FIGS. 5 and 8, the lower plate 111 has a disk shape, and is supported by the motor shaft 102 of the motor 101 passing through the center thereof. The upper plate 112 has a disk shape corresponding to the lower plate 111 and has substantially the same diameter as the lower plate 111. In the center of the upper plate 112, an air suction port 115 through which air is sucked is provided. The air inlet 115 protrudes from the upper plate 112 at a predetermined height, and the connecting portion 114 between the air inlet 115 and the upper plate 112 has a predetermined curvature so that the sucked air flows smoothly. It is formed into a curved shape having. The plurality of air guide members 113 are radially arranged at equal intervals between the upper plate 112 and the lower plate 111. Each air guide member 113 is usually formed into a curved strip having a predetermined curvature. In the case of the present embodiment, nine air guide members 113 are coupled to the upper plate 112 and the lower plate 111 by caulking joint 116. At this time, both corners 113c of the one end 113a of the air guide member 113 located on the outer peripheral side of the lower plate 111 and the upper plate 112 are chamfered. The chamfering process is preferably performed within the above-described range. In the case of the present embodiment, the length B in the width direction of the chamfer 113c is B = C / 2 = 3.5 mm when the width C of the air guide member 113 is 7 mm, and the length in the longitudinal direction of the chamfer 113c. A was 3 mm. At this time, the outermost caulking portions 116a and 116b of the caulking joint 116 are separated from the outer end 113a of the air guide member 113 by 3 mm or more (see FIG. 7).

  The diffuser 120 is disposed on the upper end of the motor 101 concentrically with the impeller 110 at a predetermined interval so that the impeller 110 can rotate outside the impeller 110. The diffuser 120 is provided with a plurality of guide members that guide the air sucked into and discharged from the impeller 110 to the motor 101 side. The diffuser 120 shown in FIGS. 3 and 8 is only one example of the diffuser 120 that can be used in the motor assembly 100 for a vacuum cleaner according to the present invention, and various other types of diffusers may be used.

  The operation of the embodiment of the motor assembly for a vacuum cleaner according to the present invention configured as described above will be described.

  When the motor shaft 102 of the motor assembly 100 rotates, the lower plate 111 of the impeller 110 supported by the motor shaft 102 also rotates, and the impeller 110 rotates. When the impeller 110 rotates, air containing dust, dust, or the like is sucked from a dust suction port of a suction brush (not shown) communicating with the air suction port 115 of the upper plate 112 of the impeller. The dust contained in the air is removed while passing through a dust collection chamber (not shown), and only clean air is drawn from the air inlet 115 of the impeller 110. The air drawn from the air inlet 115 is dispersed, drawn from the inner ends of the plurality of air guide members 113, flows toward the outer end 113 a of the air guide members 113, and is discharged to the diffuser 120 side.

  At this time, the noise of the peak value in the frequency range of 8 to 10 KHz of the impeller 110 is reduced as shown in Table 1 and FIGS. 10 and 12 as compared with the air guide member having the shape of the conventional air guide member or other shapes. To do. That is, a noise of about 9 dB is reduced compared to the air guide member 23 of the first tested impeller, and a noise of about 7.3 dB is reduced compared to the air guide member 23 ′ of the second tested impeller. . Graphs ((1), (3)) indicated by thick lines in FIGS. 10 and 12 represent the noise of the impeller according to the first embodiment of the present invention, and are graphs ((2), (4) indicated by thin lines. ) Represent the noise of the first and second tested impellers, respectively.

  Here, the air guide member 113 of the impeller 110 according to the first embodiment of the present invention is obtained by chamfering both corners 113c of the outer end 113a, and the chamfering dimension is A = 3 mm and B = 3.5 mm (see FIG. 7). Further, as shown in FIG. 9, the air guide member 23 of the first experimental impeller has both corners 23d formed at right angles, and the air guide member 23 ′ of the second experimental impeller is As shown in FIG. 11, a recess 23a ′ having a predetermined radius is provided from the outer end to the back side. The impeller 120 and the first and second tested impellers according to the first embodiment of the present invention are each composed of eight or nine air guide members. The motor used was a universal motor with rotational speeds of 3,000 and 3,600 rpm. Further, the noise represents noise having a peak value in the frequency range of 8 to 10 KHz as shown in FIGS. 10 and 12. Usually, the frequency range of 8 to 10 KHz represents the range of the impeller secondary BPF (Blade Passage Frequency). Here, BPF is the number of blades passing per second, and its unit is expressed in Hz. For example, when the motor rotation speed is 3,000 rpm and the number of the air guide members of the impeller is nine as in the embodiment of the present invention, the BPF is 4,500 Hz, which is referred to as the primary BPF. Further, the secondary BPF means that which is twice the primary BPF, and in the case of this embodiment, it is 9,000 Hz.

  The air discharged to the diffuser 120 side cools the motor 101 and is discharged from the discharge port of the main body (not shown) to the outside of the cleaner.

  Referring to FIGS. 13 and 14, the cleaner impeller 110 ′ according to the second embodiment of the present invention includes a lower plate 111, an upper plate 112 ′, and a plurality of air guide members 113.

  The lower plate 111 has a disk shape, and its center is supported by a motor shaft of a motor (not shown).

  The upper plate 112 ′ has a disk shape corresponding to the lower plate 111, and has a smaller diameter than the lower plate 111, unlike the impeller 110 according to the first embodiment. The diameter of the upper plate 112 ′ is determined corresponding to the chamfering of the plurality of air guide members 113. At this time, it is preferable that the outer peripheral end 112a 'of the upper plate 112' has a diameter corresponding to a chamfer start point 113s where chamfering in the longitudinal direction of the plurality of air guide members 113 starts. In the center of the upper plate 112 ′, an air suction port 115 through which air is sucked is provided. The air inlet 115 is preferably provided at a predetermined height from the upper plate 112 '. At this time, the connection portion 114 ′ between the air suction port 115 and the upper plate 112 ′ is formed in a curved shape having a predetermined curvature so that the sucked air flows smoothly.

  The plurality of air guide members 113 are radially arranged at equal intervals between the upper plate 112 ′ and the lower plate 111. Each air guide member 113 is usually formed into a curved strip having a predetermined curvature. Each air guide member 113 is coupled to the upper plate 112 ′ and the lower plate 111 by various coupling members. In the case of the present embodiment, each air guide member 113 is coupled to the upper plate 112 ′ and the lower plate 111 by caulking joint 116. At this time, both corners 113c of the one end 113a of the air guide member 113 located on the outer peripheral side of the lower plate 111 and the upper plate 112 'are chamfered. Since this chamfering process is the same as the chamfering process of the air guide member in the impeller 110 according to the first embodiment described above, a detailed description thereof will be omitted.

  As shown in FIG. 14, the length A in the longitudinal direction of the chamfer 113c is, as a maximum, the outermost joint portions 116a and 116b of the caulking joint 116 that joins the upper plate 112 ′ and the lower plate 111 and the air guide member 113. It is preferable to have a range shorter than the distance from the one end 113a of the air guide member 113. Alternatively, the length A in the longitudinal direction of the chamfer 113c is preferably within a range of 1.5 to 3 mm from the corner 113d before the air guide member 113 is chamfered.

  The length of the air guide member 113 is such that one end 113a of the air guide member 113 is located on the back side from the outer periphery of the lower plate 111, and the other end is located outside the air suction port 115 of the upper plate 112 ′. It only has to be.

  The operation of the cleaner impeller 110 ′ configured as described above will be described together with the operation of the cleaner motor assembly described later.

  FIG. 15 is a cross-sectional view showing a vacuum cleaner motor assembly having an impeller 110 'according to a second embodiment of the present invention.

  As shown in FIG. 15, the vacuum cleaner motor assembly 100 ′ having the impeller 110 ′ according to the second embodiment of the present invention includes a motor 101, an impeller 110 ′ that rotates with the rotation of the motor 101, and an impeller. And a diffuser 120 that guides air sucked by 110 ′ to the motor 101 side.

  The motor 101 may be of any type as long as it is a motor having a rotational speed of 3,000 to 3,600 rpm that is generally used in a vacuum cleaner. In this embodiment, the motor 101 is a universal motor having a speed of 3,000 rpm. A motor was used. Here, the motor used in the present embodiment does not limit the scope of rights of the present invention.

  The impeller 110 ′ includes a lower plate 111, an upper plate 112 ′, and a plurality of air guide members 113. As shown in FIGS. 13 and 14, the lower plate 111 has a disk shape and is supported by the motor shaft 102 of the motor 101 that passes through the center thereof. The upper plate 112 ′ has a disk shape corresponding to the lower plate 111, and has a diameter corresponding to the position of the chamfer start point 113 s of the plurality of air guide members 113. In the center of the upper plate 112 ′, an air suction port 115 through which air is sucked is provided. The air suction port 115 protrudes from the upper plate 112 ′ at a predetermined height, and the connecting portion 114 ′ between the air suction port 115 and the upper plate 112 ′ has a predetermined value so that the sucked air flows smoothly. It is formed in a curved shape having a curvature of. The plurality of air guide members 113 are radially arranged at equal intervals between the upper plate 112 ′ and the lower plate 111. Each air guide member 113 is usually formed into a curved strip having a predetermined curvature. In the case of the present embodiment, nine air guide members 113 are coupled to the upper plate 112 ′ and the lower plate 111 by caulking joint 116. At this time, both corners 113c of the one end 113a of the air guide member 113 located on the outer peripheral side of the lower plate 111 and the upper plate 112 'are chamfered. The chamfering process is preferably performed within the above-described range. In the case of the present embodiment, the length B in the width direction of the chamfer 113c is B = C / 2 = 3.5 mm when the width C of the air guide member 113 is 7 mm, and the length in the longitudinal direction of the chamfer 113c. A was 3 mm. At this time, the outermost caulking portions 116a and 116b of the caulking joint 116 are separated from the outer end 113a of the air guide member 113 by 3 mm or more (see FIG. 14).

  The diffuser 120 is disposed on the upper end of the motor 101 concentrically with the impeller 110 ′ at a predetermined interval so that the impeller 110 ′ can rotate outside the impeller 110 ′. The diffuser 120 is provided with a plurality of guide members that guide the air sucked into and discharged from the impeller 110 ′ to the motor 101 side. The diffuser 120 shown in FIG. 15 is only one example of the diffuser 120 that can be used in the cleaner motor assembly 100 ′ according to the present invention, and various other types of diffusers may be used.

  The operation of the cleaner motor assembly 100 ′ having the impeller 110 ′ according to the second embodiment of the present invention configured as described above is the same as that of the cleaner motor having the impeller 110 according to the first embodiment. Since it is the same as the assembly 100, the detailed description is abbreviate | omitted.

  At this time, in the motor assembly 100 ′ having the impeller 110 ′ according to the second embodiment of the present invention having the above-described structure, the noise of the peak value in the frequency range of 8 to 10 KHz of the impeller 110 ′ is in the prior art. Compared to the impeller 20 (see FIG. 2), the reduction is as shown in Table 2 and FIG. That is, noise of about 6.5 dB is reduced compared to the conventional impeller 20. A graph (5) indicated by a thick line in FIG. 16 represents the noise of the impeller 110 ′ according to the second embodiment of the present invention, and a graph (6) indicated by a thin line represents the noise of the impeller 20 according to the related art. . In addition, the overall noise that averaged the noise in the entire frequency range was reduced by about 1.6 dB.

  Here, the air guide member 113 of the impeller 110 ′ according to the second embodiment of the present invention is obtained by chamfering both corners 113c of the outer end 113a, and the chamfering dimension is A as described above. = 3 mm, B = 3.5 mm. Note that the diameter of the upper plate 112 ′ of the impeller 110 ′ corresponds to the start point 113 s of the chamfering process in the longitudinal direction (see FIG. 14). Further, the impeller 20 according to the prior art has an air guide member in which both corners 23d form a right angle as shown in FIG. Both the impeller 110 'according to the second embodiment of the present invention and the impeller 20 according to the prior art are composed of eight or nine air guide members. The motor used was a universal motor with rotational speeds of 3,000 and 3,600 rpm. Overall noise represents a value obtained by averaging noise in the entire frequency range, and noise having a peak value of 8 to 10 KHz represents noise having a peak value in the frequency range of 8 to 10 KHz. Usually, the frequency range of 8 to 10 KHz represents the range of the impeller secondary BPF (Blade Passage Frequency). Here, BPF is the number of blades passing per second, and its unit is expressed in Hz. For example, when the motor rotation speed is 3,000 rpm and the number of the air guide members of the impeller is nine as in the embodiment of the present invention, the BPF is 4,500 Hz, which is referred to as the primary BPF. Further, the secondary BPF means that which is twice the primary BPF, and in the case of this embodiment, it is 9,000 Hz.

  FIG. 17 is a diagram schematically showing an embodiment of a cleaner provided with a motor assembly 100 having an impeller 110 according to the first embodiment of the present invention.

  As shown in FIG. 17, the vacuum cleaner 200 according to the present invention includes a suction brush 210 that sucks dust and dirt, an extension pipe 220 that communicates the suction brush 210 and the main body 230, a dust collection chamber, and a motor chamber 231. And a main body 230 defined.

  The suction brush 210 has a dust suction port (not shown) for sucking dust and dirt from the floor surface. A dust collection unit (not shown) is provided with a dust collection unit that separates / collects dust from the air containing dust sucked from the suction brush 210. As the dust collection unit, either a general dust collection bag or a cyclone dust collection unit may be used. The motor chamber 231 is provided with a motor assembly 100 that generates a suction force for sucking dust and dirt from the suction brush 210. The motor assembly 100 includes a motor 101, an impeller 110 (see FIG. 8) that rotates as the motor 101 rotates, and a diffuser 120 that guides air sucked by the impeller 110 to the motor 101 side. The impeller 110 includes a plurality of air guide members 113, and both corners 113c of the outer end 113a of the air guide member 113 are chamfered. The details of the motor assembly 100 are as described above, and the other components are the same as those of a general vacuum cleaner, and thus detailed description thereof is omitted.

  When cleaning is performed with the vacuum cleaner 200 according to the present invention as described above, the motor 101 in the motor chamber 231 starts to rotate when the power is turned on. When the motor 101 rotates, the impeller 110 pivotally supported at the tip of the motor shaft 102 starts to rotate in conjunction with this. If the impeller 110 rotates, air containing dust or dust is sucked from the dust suction port of the suction brush 210. The air containing the dust and the like that is sucked in is cleaned by removing the dust while passing through the dust collection unit in the dust collection chamber. The air from which dust or the like has been removed is drawn from the air suction port 115 of the impeller 110, flows to the outer ends 113a of the plurality of air guide members 113, and is drawn to the diffuser 120 side (see FIGS. 7 and 8). . At this time, since both corners 113c of the outer ends 113a of the plurality of air guide members 113 are chamfered, noise having a peak value in the frequency range of 8 to 10 KHz is reduced. The air drawn into the diffuser 120 side flows through the motor 101 and is discharged from the discharge port 233 to the outside of the main body 230.

  The vacuum cleaner including the motor assembly 100 including the impeller 110 according to the first embodiment has been described above. However, the vacuum cleaner including the motor assembly 100 ′ including the impeller 110 ′ according to the second embodiment is described. Since the configuration and operation are similar to those described above, detailed description thereof is omitted.

  The present invention is not limited to the specific embodiments described above, and is performed by a person having ordinary knowledge in the technical field to which the invention pertains without departing from the gist of the present invention claimed in the claims. It is obvious that the simple replacement of components, addition, deletion, and change that are obtained belong to the scope of the claims of the present invention.

  The present invention can be used in all industrial fields in which a vacuum cleaner is produced, sold, used, or the like.

It is sectional drawing which shows schematically the motor assembly which concerns on a prior art. It is a perspective view which shows the impeller for vacuum cleaners used for the motor assembly in FIG. It is a top view which shows the state which an impeller rotates inside a diffuser. It is a figure which shows the noise source of the impeller discovered by the flow analysis of computer simulation. It is a perspective view showing the 1st example of the impeller for vacuum cleaners concerning the present invention. It is a front view of the impeller for vacuum cleaners concerning the 1st Example in FIG. It is a figure for demonstrating the chamfering of the air guide member of the impeller for vacuum cleaners concerning the 1st Example in FIG. It is a figure which shows the motor assembly which has the impeller which concerns on 1st Example of this invention. It is a figure which shows the air guide member of the 1st to-be-tested impeller used for the noise comparison experiment. It is a graph which shows the result by the noise comparison experiment of the air guide member in FIG. 9, and the air guide member which concerns on one Example of this invention. It is a figure which shows the air guide member of the 2nd to-be-tested impeller used for the noise comparison experiment. It is a graph which shows the result by the noise comparison experiment of the air guide member in FIG. 11, and the air guide member which concerns on one Example of this invention. It is a perspective view which shows the 2nd Example of the impeller for vacuum cleaners which concerns on this invention. It is a partial front view of the impeller for vacuum cleaners concerning the 2nd Example in FIG. It is a figure which shows the motor assembly which has the impeller which concerns on 2nd Example of this invention. It is a graph which shows the result by the noise comparison experiment of the impeller which concerns on a prior art, and the impeller which concerns on the 2nd Example of this invention. It is a figure which shows one Example of the cleaner provided with the motor assembly which concerns on one Example of this invention.

Explanation of symbols

100, 100 'Motor assembly 101 Motor 102 Motor shaft 110, 110' Impeller 111 Lower plate 112, 112 'Upper plate 113 Air guide member 115 Air inlet 120 Diffuser 200 Vacuum cleaner 210 Suction brush 220 Extension tube 230 Main body 231 Motor chamber

Claims (12)

A disk-shaped lower plate,
An upper plate disposed at a predetermined distance from the lower plate, having the same diameter as the lower plate and having an air suction port formed in the center, and radially disposed between the upper plate and the lower plate A plurality of air guide members whose outer corners are chamfered;
Impeller for vacuum cleaner characterized by including. The impeller for a vacuum cleaner according to claim 1, wherein the chamfering satisfies the following formula.

(In the above formula, B represents the length in the width direction of the chamfered air guide member, and C represents the width of the air guide member)   The impeller for a vacuum cleaner according to claim 2, wherein a length A in the longitudinal direction of the chamfered air guide member is 1.5 to 3 mm. A disk-shaped lower plate,
A plurality of air guide members radially arranged on the upper side of the lower plate and chamfered at both corners of the outer end; and a chamfer of the plurality of air guide members arranged on the upper side of the plurality of air guide members. An upper plate having a diameter corresponding to the starting point of processing and having an air suction port formed in the center;
Impeller for vacuum cleaner characterized by including. The impeller for a vacuum cleaner according to claim 4, wherein the chamfering satisfies the following expression.

(In the above formula, B represents the length in the width direction of the chamfered air guide member, and C represents the width of the air guide member)   The impeller for a vacuum cleaner according to claim 5, wherein a length of the chamfered air guide member in a longitudinal direction is 1.5 to 3 mm. A motor,
A disk-shaped lower plate provided on the motor shaft of the motor;
An upper plate disposed at a predetermined distance from the lower plate, having the same diameter as the lower plate, and having an air suction port formed in the center;
An impeller including a plurality of air guide members radially disposed between the upper plate and the lower plate and chamfered at both corners of the outer end, and disposed at an upper end of the motor and sucked from the impeller A diffuser for guiding air to the motor side;
A motor assembly for a vacuum cleaner, comprising: The motor assembly for a vacuum cleaner according to claim 7, wherein the chamfering satisfies the following formula.

(In the above formula, B represents the length in the width direction of the chamfered air guide member, and C represents the width of the air guide member)   9. The motor assembly for a vacuum cleaner according to claim 8, wherein the chamfered air guide member has a length in the longitudinal direction of 1.5 to 3 mm. A motor,
A disk-shaped lower plate,
A plurality of air guide members radially disposed on the lower plate and chamfered at both corners of the outer end; and
An impeller including an upper plate disposed on an upper side of the plurality of air guide members and having a diameter corresponding to a start point of chamfering of the plurality of air guide members and having an air suction port formed in the center; and the motor A diffuser that is disposed at an upper end of the impeller and guides air sucked from the impeller to the motor side;
A motor assembly for a vacuum cleaner, comprising: The motor assembly for a vacuum cleaner according to claim 10, wherein the chamfering satisfies the following formula.

(In the above formula, B represents the length in the width direction of the chamfered air guide member, and C represents the width of the air guide member)   The motor assembly for a vacuum cleaner according to claim 11, wherein the chamfered air guide member has a longitudinal length of 1.5 to 3 mm.

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