KR100633431B1 - Impeler and motor assembly having the same - Google Patents

Abstract

 The present invention relates to a vacuum cleaner impeller, a motor assembly and a vacuum cleaner having the same that can reduce the peak (peak) noise of the frequency range of 8 ~ 10KHz. The vacuum cleaner impeller according to the present invention is installed in a disk-shaped lower plate and spaced apart from the lower plate by a predetermined distance and has the same diameter as the lower plate and is radially interposed between the upper plate and the upper plate and the lower plate having an air inlet formed in the center, and both sides of the outer end. The edges include a plurality of air guide members chamfered.

Impeller, chamfer, tops, noise, frequency, motor assembly,

Description

 Impeller for vacuum cleaner and motor assembly with same {Impeler and motor assembly having the same}

 1 is a cross-sectional view schematically showing a motor assembly according to the prior art,

Figure 2 is a perspective view of the impeller for the vacuum cleaner used in the motor assembly of Figure 1,

3 is a plan view showing the impeller rotating inside the diffuser,

4 is a view showing the noise source of the impeller found through the flow analysis of the computer simulation,

5 is a perspective view showing a first embodiment of an impeller for a vacuum cleaner according to the present invention;

6 is a front view of the impeller for the vacuum cleaner according to the first embodiment of FIG.

7 is a view for explaining the chamfer of the air guide member of the impeller for vacuum cleaner according to the first embodiment of FIG.

8 is a view showing a motor assembly having an impeller according to a first embodiment of the present invention;

9 is a view showing the air guide member of the first experimental impeller used in the noise comparison experiment,

10 is a graph showing the results of the noise comparison test by the air guide member and the air guide member according to an embodiment of the present invention of FIG.

11 is a view showing the air guide member of the second test impeller used in the noise comparison experiment,

12 is a graph showing the results of the noise comparison experiment by the air guide member of Figure 11 and the air guide member according to an embodiment of the present invention,

13 is a perspective view showing a second embodiment of the impeller for a vacuum cleaner according to the present invention;

14 is a partial front view of the impeller for the vacuum cleaner according to the second embodiment of FIG.

15 is a view showing a motor assembly having an impeller according to a second embodiment of the present invention;

16 is a graph showing the noise comparison test results of the impeller according to the second embodiment of the present invention and the prior art,

17 is a view showing an embodiment of a vacuum cleaner having a motor assembly according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

100,100 '; Motor assembly 101; motor

102; Motor shaft 110,110 '; Impeller

111; Bottom 112,112 '; Tops

113; Air guide member 115; Air intake

120; Diffuser 200; Vacuum cleaner

210; Suction brush 220; Extension

230; Body 231; Motor room

 The present invention relates to a vacuum cleaner, and more particularly, to an impeller used in a motor assembly for a vacuum cleaner.

In general, a vacuum cleaner generates a partial vacuum and uses the same to collect dirt and the like. Thus, the vacuum cleaner has a motor assembly for generating a partial vacuum. Partial vacuum is generated by the intake of air by an impeller rotating by a motor.

1 is a schematic cross-sectional view of a motor assembly according to the prior art, and FIG. 2 is a perspective view of the impeller of FIG. 1.

1 and 2, the motor assembly 1 according to the related art includes a motor 10, an impeller 20 rotating by the motor 10, and air sucked by the impeller 20. A diffuser 30 leading to

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 disc shape and is provided on the motor shaft 11 of the motor 10. The upper plate 22 is shaped to have a disk shape corresponding to the lower plate 21 to have a diameter substantially the same as that of the lower plate 21. In the center of the upper plate 22 is provided an air suction port 25 through which air is sucked. The plurality of air guide members 23 are interposed at regular intervals radially between the upper plate 22 and the lower plate 21. Each air guide member 23 is usually formed into a curved band having a constant curvature. At this time, one end 23a of the air guide member 23 positioned on the outer circumferential side of the lower plate 21 and the upper plate 22 is formed at right angles. In addition, the length of the air guide member 23 is one end (23a) of the air guide member 23 is located inside the outer periphery of the upper plate 22 and the lower plate 21, the other end of the air inlet ( The length is located outside of 25).

The diffuser 30 is installed at the upper end of the motor 10 concentrically with the impeller 20 at regular intervals so that the impeller 20 can rotate on the outside of the impeller 20. The diffuser 30 is provided with a plurality of guide members for guiding the air sucked into the impeller 20 and discharged toward the motor 10.

The operation of the conventional motor assembly having the above configuration will be described with reference to FIGS. 1 and 2.

When the motor 10 of the motor assembly 1 rotates, the impeller 20 is rotated by the lower plate 21 of the impeller 20 provided on the motor shaft 11. When the impeller 20 rotates, air, including dust or dirt, is sucked through the dirt suction port of the suction brush (not shown) in communication with the air suction port 25 of the impeller upper plate 22. The dirt contained in the air is removed by passing through the dirt collection unit of the dust chamber, not shown, and only clean air is introduced into the air intake 25 of the impeller 20. The air drawn into the air suction port 25 is discharged toward the diffuser 30 along the plurality of air guide members 23. The air discharged to the diffuser 30 cools the motor 10 and is discharged to the outside of the vacuum cleaner through the discharge port of the main body, not shown.

By the way, there is a problem that the vacuum cleaner for collecting the dirt by using the air suction input of the motor assembly 1 generates a considerably loud noise due to the motor 10 rotating at a high speed. In order to reduce such noise, various methods such as changing the flow path of air discharged through the motor assembly or installing a sound absorbing member have been invented and used, but have not completely reduced the noise. In particular, in order to relieve the discomfort of the consumer during cleaning, it is necessary to reduce the peak value noise of the frequency range 8 ~ 10KHz among the noise generated when the impeller 20 of the motor assembly 1 rotates.

 The present invention has been made in view of the above problems, it provides a vacuum cleaner impeller that can reduce the peak (peak) noise and overall noise of the frequency range of 8 ~ 10KHz among the noise generated during the rotation of the impeller. There is a purpose.

Another object of the present invention is to provide a motor assembly having an impeller for a vacuum cleaner as described above so as to reduce noise.

 An object of the present invention as described above, the disk-shaped lower plate; An upper plate installed at a predetermined distance from the lower plate, the upper plate having the same diameter as the lower plate and having an air inlet at the center thereof; And a plurality of air guide members radially interposed between the upper plate and the lower plate, the both side edges of the outer ends of which are chamfered.

을 만족하도록 하는 것이 바람직하다. 여기서, B는 공기안내부재의 폭 방향의 모따기 길이이고, C는 공기안내부재의 폭이다.In this case, the chamfer

It is desirable to satisfy. Here, B is the chamfer length in the width direction of the air guide member, C is the width of the air guide member.

In addition, the plurality of air guide members are cogging (cogging) bonded to the upper plate and the lower plate.

The chamfer is preferably processed such that the length of the chamfer in the longitudinal direction of the air guide member is smaller than the position of the outermost cogging portion of the cogging junction. Alternatively, the chamfer length in the longitudinal direction is preferably 1.5 to 3 mm.

 In another aspect of the present invention, an object of the present invention as described above, the disk-shaped lower plate; A plurality of air guide members installed radially on the lower plate and having both edges of the outer end chamfered; And an upper plate installed above the plurality of air guide members and having a diameter corresponding to the starting point of the chamfering processing of the plurality of air guide members and having an air inlet formed in the center thereof. have.

 In another aspect of the present invention, an object of the present invention as described above, a motor; The lower plate is installed in the motor shaft of the motor and the lower plate is installed spaced apart from the lower plate, the upper plate having the same diameter as the lower plate and the air inlet is formed in the center, and radially interposed between the upper plate and the lower plate, An impeller including a plurality of air guide members whose both edges of the outer end are chamfered; And a diffuser installed at an upper end of the motor and directing air sucked from the impeller toward the motor.

를 만족하도록 형성하는 것이 바람직하다. 여기서, B는 공기안내부재의 폭방향의 모따기 길이이고, C는 공기안내부재의 폭이다.In this case, the chamfer

It is preferable to form so as to satisfy. Here, B is the chamfer length in the width direction of the air guide member, and C is the width of the air guide member.

In addition, the plurality of air guide member is cogging (cogging) bonded to the upper plate and the lower plate, in this case, the chamfer is processed so that the length of the chamfer in the longitudinal direction of the air guide member is smaller than the position of the outermost cogging portion of the cogging joint do. Alternatively, the length of the chamfer in the longitudinal direction is processed to 1.5 ~ 3mm.

 In another aspect of the present invention, an object of the present invention as described above, a motor; The lower plate of the disc shape, and a plurality of air guide members radially installed on the upper side of the lower plate and the outer edges of both ends are chamfered and the air guide member is installed at the starting point of the chamfer of the plurality of air guide members An impeller having a corresponding diameter and including an upper plate having an air inlet formed therein; And a diffuser installed at an upper end of the motor and configured to direct air sucked from the impeller to the motor.

In this case, the chamfer is preferably processed such that the length of the chamfer in the longitudinal direction of the air guide member is less than the distance to the cogging portion located at the outermost of the cogging portion of the lower plate and the plurality of air guide member cogging.

 In another aspect of the present invention, an object of the present invention as described above, the suction brush, a dirt collection unit in communication with the suction brush and collecting the dirt and a motor assembly in communication with the dirt collection unit to generate a suction force; A vacuum cleaner comprising: the motor assembly comprises a motor; The lower plate of the disk is installed on the motor shaft of the motor, is installed spaced apart from the lower plate a predetermined distance, the upper plate having the same diameter as the lower plate and the air inlet is formed in the center, and radially interposed between the upper plate and the lower plate Impeller including a plurality of air guide member chamfered on both sides of the outer end; And a diffuser installed at an upper end of the motor and directing air sucked from the impeller toward the motor.

 Hereinafter, in order to reduce the noise generated when the impeller rotates, in particular, the peak value of the frequency range of 8 to 10 kHz, an experiment was first conducted to find out where the noise source is, and the results are shown in FIGS. 3 and 4. Will be explained.

As shown in FIG. 3, flow simulation was performed by rotating the impeller 20 in the interior of the diffuser through computer simulation. The result is shown in FIG. Referring to FIG. 4, it can be seen that a triangular tail 23b hangs on the outer end 23a of the plurality of air guide members 23. This triangular tail 23b represents the force applied to the outer end 23a of the plurality of air guide members 23. From this, it can be seen that the noise generated when the impeller 20 rotates is generated at the outer ends 23a of the plurality of air guide members 23 of the impeller 20. This is because when the impeller 20 rotates inside the diffuser 30 as shown in FIG. 3, the outer end 23a of the air guide member 23 of the impeller 20 and the guide member of the diffuser 30 ( It can be interpreted that it is caused by the interaction of That is, when the impeller 20 rotates, the noise source may be determined as the outer end 23a of the plurality of air guide members 23.

Therefore, in order to reduce noise during rotation of the impeller 20, in particular, peak value noise in the frequency range of 8 to 10 KHz, the shape of the outer end 23a of the air guide member 23 and the diameter of the impeller upper plate are changed. The present invention has been made.

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

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

5 and 6, the impeller 110 for a vacuum cleaner 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 is in the shape of a disc, the center of which is installed on the motor shaft of the motor not shown. The upper plate 112 has a disk shape corresponding to the lower plate 111 and has a diameter substantially the same as that of the lower plate 111. In the center of the upper plate 112 is provided an air suction port 115 through which air is sucked. In addition, the air inlet 115 is preferably formed to protrude a predetermined height from the top plate (112). At this time, the air inlet 115 and the connecting portion 114 of the upper plate 112 is formed in a curve of a predetermined curvature so that the air sucked smoothly. The plurality of air guide members 113 are interposed at regular intervals radially between the upper plate 112 and the lower plate 111. Each air inner 113 is typically shaped into a curved strip having a constant curvature. And, each air guide member 113 is coupled to the upper plate 112 and the lower plate 111 by a variety of coupling members. In the present embodiment, each air guide member 113 is coupled to the upper plate 112 and the lower plate 111 by a cogging (115) cogging (115). At this time, both edges 113c of the air guide member 113 positioned on the outer circumferential side of the lower plate 111 and the upper plate 112 are chamfered. It is preferable that this chamfering process is performed within the following range.

7 is a view for explaining the chamfering process of the air guide member. Referring to FIG. 7, the length A in the longitudinal direction of the air guide member 113 of the chamfer 113c (hereinafter, referred to as the “length in the longitudinal direction of the chamfer”) may be at the upper and lower plates 112 and 111. It is preferable to form so as to be shorter than the distance from the outermost joint portion (116a, 116b) of the cogging joint 116 for coupling the air guide member 113 to one end (113a) of the air guide member 113. Alternatively, the longitudinal length A of the chamfer 113c is preferably within the range of 1.5 to 3 mm from the original edge 113d. In addition, the length B in the width direction of the air guide member 113 of the chamfer 113c (hereinafter, referred to as the “width direction length of the chamfer”) is preferably determined to satisfy the following equation.

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

In addition, the length of the air guide member 113 is one end 113a of the air guide member 113 is located inside the outer periphery of the upper plate 112 and the lower plate 111, the other end of the air inlet ( 115) to the outside of the length.

The operation of the vacuum cleaner impeller 110 configured as described above will be described together when explaining the operation of the vacuum cleaner motor assembly to be described later.

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

Referring to FIG. 8, the motor assembly 100 for a vacuum cleaner having an impeller according to the first embodiment of the present invention includes a motor 101, an impeller 110 rotating by the motor 101, and an impeller 110. It includes a diffuser 120 to guide the air sucked by the toward the motor (101).

Motor 101 is generally a motor having a rotational speed of 3,000 ~ 3,600rpm used in a vacuum cleaner can be used in a variety of types, but in the present embodiment used a universal motor of 3,000rpm. Here, the motor used in this embodiment does not limit the scope of the present patent.

The impeller 110 includes a lower plate 111, an upper plate 112, and a plurality of air guide members 113. 5 and 8, the lower plate 111 has a disc shape, the center of which is provided on the motor shaft 102 of the motor 101. The upper plate 112 has a disk shape corresponding to the lower plate 111 and has a diameter substantially the same as that of the lower plate 111. In the center of the upper plate 112 is provided an air suction port 115 through which air is sucked. In addition, the air inlet 115 is formed so as to protrude a predetermined height from the top plate 112, the air inlet 115 and the connecting portion 114 of the top plate 112 is formed in a curve of a predetermined curvature so that the air sucked smoothly. do. The plurality of air guide members 113 are interposed at regular intervals radially between the upper plate 112 and the lower plate 111. Each air guide member 113 is usually shaped into a curved strip having a constant curvature. In the present embodiment, nine air guide members 113 are coupled to the upper plate 112 and the lower plate 111 by cogging (116). At this time, both edges 113c of the air guide member 113 positioned on the outer circumferential side of the lower plate 111 and the upper plate 112 are chamfered. It is preferable that a chamfering process is performed within the range mentioned above. In the present embodiment, the widthwise length B of the chamfer 113c is B = C / 2 = 3.5mm when the width C = 7mm of the air guide member 113, and the lengthwise length of the chamfer 113c. (A) was 3 mm. At this time, the outermost cogging portions 116a and 116b of the cogging joint 116 are separated by at least 3 mm from the outer end 113a of the air guide member 113 (see FIG. 7).

The diffuser 120 is installed on the top of the motor 101 concentrically with the impeller 110 at regular intervals so that the impeller 120 can rotate on the outside of the impeller 110. The diffuser 120 is provided with a plurality of guide members for guiding the air sucked into the impeller 110 toward the motor 101. The diffuser 120 shown in FIGS. 3 and 8 is only one embodiment of the diffuser 120 that can be used in the vacuum cleaner motor assembly 100 according to the present invention, and various types of diffusers may be used.

The operation of one 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 installed on the motor shaft 102 also rotates, thereby rotating the impeller 110. When the impeller 110 rotates, air, including dust or dirt, is sucked through the dirt suction port of the suction brush (not shown) in communication with the air suction port 115 of the impeller upper plate 112. The dirt contained in the air is removed through the dust chamber not shown, and only clean air is introduced into the air inlet 115 of the impeller 110. The air introduced into the air inlet 115 is dispersed and introduced into the inner ends of the plurality of air guide members 113, and the air drawn into the inner ends is diffused along the outer ends 113a of the air guide members 113. )

At this time, the peak noise of the frequency range of 8 ~ 10KHz of the impeller 110 is reduced as shown in Table 1 and FIGS. 10 and 12 compared to the air guide member of the conventional air guide member or other shapes do. That is, the noise of about 9 dB is reduced compared to the air guide member 23 of the first test impeller, and the noise of about 7.3 dB is reduced compared to the air guide member 23 'of the second test impeller. In FIGS. 10 and 12, the graphs (①, ③) shown by thick lines represent the noise of the impeller according to the first embodiment of the present invention, and the graphs (②, ④) indicated by the thin lines are first and second, respectively. Indicates the noise of the test impeller.

Shape of impeller air guide member Power Consumption (W) Noise (dB) Air guide member of the impeller according to the first embodiment of the present invention 875 75.3 Air guide member of the first test impeller 896 86.3 Air guide member of the second test impeller 878 82.6

 Here, the air guide member 113 of the impeller 110 according to the first embodiment of the present invention is a chamfering process of both edges 113c of the outer end 113a, the chamfering processing dimension is A as described above = 3 mm and B = 3.5 mm (see FIG. 7). In addition, as shown in FIG. 9, the air guide member 23 of the first test impeller has a right angle at both corners 23d of the air guide member 23, and the air guide member 23 ′ of the second test impeller. 11 is formed into a groove 23'a having a predetermined radius from the outer end of the air guide member 23 'to the inner side. In the case of the impeller 120 and the first and second test impellers according to the first embodiment of the present invention, all eight or nine air guide members are configured. In addition, the motor used the universal motor of rotation speed 3,000 and 3,600 rmp. In addition, the noise represents peak value noise in the frequency range of 8 to 10 KHz as shown in FIGS. 10 and 12. Typically, the frequency range of 8 to 10 kHz represents the range of the second order BPF (Blade Passage Frequency) of the impeller. Here, BPF is the number of wings passing per second, the unit of which is expressed in Hz. For example, when the number of revolutions of the motor is 3,000 rpm and the number of air guide members of the impeller is 9, as in the embodiment of the present invention, the BPF becomes 4,500 Hz, which is referred to as primary BPF. In addition, the secondary BPF means that the primary BPF is doubled, and in this embodiment, 9,000 Hz.

The air discharged to the diffuser 120 cools the motor 101 and is discharged to the outside of the vacuum cleaner through the discharge port of the main body, not shown.

13 and 14, the vacuum 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 is in the shape of a disc, the center of which is installed on the motor shaft of the 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 chamfer of the plurality of air guide members 113. At this time, the top plate 112 ′ determines the diameter so that the outer circumferential end 112 ′ of the top plate 112 ′ corresponds to the chamfering start point 113 s where the chamfering processing of the plurality of air guide members 113 starts in the longitudinal direction. It is preferable. In the center of the upper plate 112 ′, an air intake port 115 through which air is sucked is provided. In addition, the air suction port 115 is preferably formed to protrude a predetermined height from the top plate (112 '). At this time, the connection portion 114 ′ of the air suction port 115 and the upper plate 112 ′ is formed in a curve of a predetermined curvature so that the air sucked smoothly.

The plurality of air guide members 113 are interposed at regular intervals radially between the upper plate 112 ′ and the lower plate 111. Each air guide member 113 is usually shaped into a curved strip having a constant 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 this embodiment, each air guide member 113 is coupled to the upper plate 112 'and the lower plate 111 by a cogging (115) cogging (115). At this time, both edges 113c of the air guide member 113 positioned on the outer circumferential side of the lower plate 111 and the upper plate 112 'are chamfered. Since the chamfering process is the same as the chamfering process of the air guide member in the impeller 110 of the above-described first embodiment, a detailed description thereof will be omitted.

Referring to FIG. 14, the length A in the longitudinal direction of the chamfer 113c is the outermost junction of the cogging junction 116 that couples the upper plate 112 'and the lower plate 111 and the air guide member 113 to the maximum. It is preferable to form shorter than the distance from the (116a, 116b) to the one end (113a) of the air guide member 113. Alternatively, the longitudinal length A of the chamfer 113c is preferably within a range of 1.5 to 3 mm from the original edge 113d of the air guide member 113.

In addition, the length of the air guide member 113 is one end (113a) of the air guide member 113 is located on the inner side than the outer periphery of the lower plate 111, the other end of the air inlet 115 of the upper plate 112 '. It is determined by the length on the side.

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

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

Referring to FIG. 15, a vacuum cleaner motor assembly 100 ′ having an impeller 110 ′ according to a second embodiment of the present invention is an impeller 110 ′ that is rotated by a motor 101 and a motor 101. ), A diffuser 120 for directing the air sucked by the impeller 110 'toward the motor 101.

Motor 101 is generally a motor having a rotational speed of 3,000 ~ 3,600rpm used in a vacuum cleaner can be used in a variety of types, but in the present embodiment used a universal motor of 3,000rpm. Here, the motor used in this embodiment does not limit the scope of the present patent.

The impeller 110 ′ includes a lower plate 111, an upper plate 112 ′, and a plurality of air guide members 113. Referring to FIGS. 13 and 14, the lower plate 111 has a disc shape, the center of which is provided on the motor shaft 102 of the motor 101. The upper plate 112 ′ has a disk shape corresponding to the lower plate 111 and has a diameter corresponding to the position of the chamfering start point 113s of the plurality of air guide members 113. In the center of the upper plate 112 ′, an air intake port 115 through which air is sucked is provided. In addition, the air inlet 115 is formed to protrude a predetermined height from the top plate 112 ', the connection portion 114' of the air inlet 115 and the top plate 112 'is of a certain curvature so that the air sucked smoothly flows. It is formed into a curve. The plurality of air guide members 113 are interposed at regular intervals radially between the upper plate 112 ′ and the lower plate 111. Each air guide member 113 is usually shaped into a curved strip having a constant curvature. In the present embodiment, nine air guide members 113 are coupled to the upper plate 112 'and the lower plate 111 by cogging (116). At this time, both edges 113c of the air guide member 113 positioned on the outer circumferential side of the lower plate 111 and the upper plate 112 'are chamfered. It is preferable that a chamfering process is performed within the range mentioned above. In the present embodiment, the widthwise length B of the chamfer 113c is B = C / 2 = 3.5mm when the width C = 7mm of the air guide member 113, and the lengthwise length of the chamfer 113c. (A) was 3 mm. At this time, the outermost cogging portions 116a and 116b of the cogging joint 116 are separated by at least 3 mm from the outer end 113a of the air guide member 113 (see FIG. 14).

The diffuser 120 is installed at the upper end of the motor 101 concentrically with the impeller 110 'at regular intervals to allow the impeller 120' to rotate outside the impeller 110 '. The diffuser 120 is provided with a plurality of guide members for guiding the air sucked into the impeller 110 ′ toward the motor 101. The diffuser 120 shown in FIG. 15 is only one embodiment of the diffuser 120 that may be used in the vacuum cleaner motor assembly 100 'according to the present invention, and various types of diffusers may be used.

The operation of the vacuum cleaner motor assembly 100 ′ having the impeller 110 ′ according to the second embodiment of the present invention is for the vacuum cleaner having the impeller 110 according to the first embodiment described above. Since the same as the motor assembly 100, detailed description thereof will be omitted.

At this time, the motor assembly 100 ′ having the impeller 110 ′ according to the second embodiment of the present invention having the structure described above has a peak value noise of 8 to 10 KHz in the frequency range of the impeller 110 ′. Compared to this impeller 20 (see FIG. 2) according to the prior art, it is reduced as shown in Table 2 and FIG. That is, compared with the conventional impeller 20, the noise of about 6.5 dB is reduced. In Fig. 16, the graph? Shown by the thick line represents the noise of the impeller 110 'according to the second embodiment of the present invention, and the graph? Represented by the thin line represents the noise of the impeller 20 according to the prior art. In addition, the total noise averaged over the entire frequency range is reduced by 1.6 dBA.

division Overall noise (dBA) 8 ~ 10KHz peak noise (dB) Impeller according to the second embodiment of the present invention 93.4 75.3 Impeller according to the prior art 94.9 86.3

Here, the air guide member 113 of the impeller 110 ′ according to the second embodiment of the present invention is chamfered at both edges 113c of the outer end 113a, and the chamfering processing dimensions are as described above. A = 3mm and B = 3.5mm. And the diameter of the upper plate 112 'of the impeller 110' corresponds to the longitudinal processing start point 113s of a chamfer (refer FIG. 14). In addition, the impeller 20 according to the related art has an air guide member having both corners 23d at right angles as shown in FIG. 9. In the case of the impeller 110 ′ according to the second embodiment of the present invention and the impeller 20 according to the prior art, all eight or nine air guide members are configured. In addition, the motor used the universal motor of rotation speed 3,000 and 3,600 rmp. The total noise represents the average value of the noise in the entire frequency range, and the 8-10KHz peak value noise represents the noise having a peak value in the frequency range 8-10KHz. Typically, the frequency range of 8 to 10 kHz represents the range of the second order BPF (Blade Passage Frequency) of the impeller. Here, BPF is the number of wings passing per second, the unit of which is expressed in Hz. For example, when the number of revolutions of the motor is 3,000 rpm and the number of air guide members of the impeller is 9, as in the embodiment of the present invention, the BPF becomes 4,500 Hz, which is referred to as primary BPF. In addition, the secondary BPF means that the primary BPF is doubled, and in this embodiment, 9,000 Hz.

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

Referring to FIG. 17, the vacuum cleaner 200 according to the present invention includes an suction brush 210 for sucking dust or dirt, an extension tube 220 for communicating the suction brush 210 and the main body 230, and a dust collecting chamber. The main body 230 divided into the motor chamber 231 is included.

Suction brush 210 has a dirt suction port (not shown) for sucking dust or dirt on the bottom surface. The dust collecting chamber (not shown) is provided with a dirt collecting unit for separating and collecting dirt and the like from the air containing dirt and the like sucked through the suction brush 210. The dirt collecting unit may be used in any of a general dust bag or cyclone dust collecting unit. The motor assembly 231 is installed in the motor chamber 231 to generate a suction force for sucking dust or dirt from the suction brush 210. The motor assembly 100 includes a motor 101, an impeller 110 rotating by the motor 101 (see FIG. 8), and a diffuser 120 for directing air sucked by the impeller 110 toward the motor 101. Include. The impeller 110 includes a plurality of air guide members 113, and both edges 113c of the outer end 113a of the air guide member 113 are chamfered. Since the motor assembly 100 is the same as described above and other components are the same as a general vacuum cleaner, a detailed description thereof will be omitted.

When cleaning with the vacuum cleaner 200 according to the present invention as described above, when the power is turned on (ON), the motor 101 of the motor chamber 231 is rotated. When the motor 101 rotates, the impeller 110 provided at the tip of the motor shaft 102 rotates. When the impeller 110 rotates, air containing dust or dirt is sucked through the dirt suction port of the suction brush 210. The air containing the sucked dirt is passed through the dirt collecting unit of the dust collecting chamber and the dirt is removed to be clean. The air from which dirt is removed is introduced into the air intake port 115 of the impeller 110 and is introduced into the diffuser 120 through the outer ends 113a of the plurality of air guide members 113 (see FIGS. 7 and 8). ). At this time, since both edges 113c of the outer end 113a of the plurality of air guide members 113 are chamfered, peak noise of a frequency range of 8 to 10 KHz is reduced. Air introduced into the diffuser 120 is discharged to the outside of the main body 230 through the motor 101 through the outlet 233.

In the above, the vacuum cleaner including the motor assembly 100 having the impeller 110 according to the first embodiment has been described, but the motor assembly 100 'having the impeller 110' according to the second embodiment is provided. The construction and operation of the vacuum cleaner are also similar to those described above, and thus the detailed description thereof will be omitted.

As described above, according to the vacuum cleaner impeller according to the present invention, it is possible to reduce the peak value noise of the frequency range 8-10KHz and the noise in the overall frequency range at the time of impeller rotation than the conventional impeller.

In addition, according to the motor assembly for a vacuum cleaner having an impeller according to the present invention, it is possible to reduce the peak value noise of the frequency range 8 ~ 10KHz and the noise in the overall frequency range when the motor rotates compared to the conventional motor assembly. have.

In particular, according to the vacuum cleaner having a motor assembly according to the present invention, since the peak value noise of the frequency range 8 ~ 10KHz and the noise in the entire frequency range is reduced than the conventional vacuum cleaner can perform cleaning in a quiet state have.

The present invention is not limited to the specific embodiments described above, but can be performed by a person skilled in the art to which the present invention pertains without departing from the spirit of the present invention described in the claims below. Substitutions, additions, deletions, and alterations fall within the scope of the claims.

Claims (12)

 Disc-shaped lower plate; An upper plate installed at a predetermined distance from the lower plate, the upper plate having the same diameter as the lower plate and having an air inlet at the center thereof; And A radially interposed between the upper plate and the lower plate, a plurality of air guide member chamfered on both sides of the outer end; Impeller for a vacuum cleaner comprising a.  The method of claim 1, The chamfer is an impeller for a vacuum cleaner, characterized in that formed to satisfy the following conditions:

Here, B is the length of the width direction of the air guide member of a chamfer, C is the width of the air guide member.  The method of claim 2, Length (A) in the longitudinal direction of the air guide member of the chamfer is an impeller for a vacuum cleaner, characterized in that 1.5 ~ 3mm. Disc-shaped lower plate; A plurality of air guide members installed radially on the lower plate and having both edges of the outer end chamfered; And It is installed on the plurality of air guide member, the upper plate having a diameter corresponding to the start point of the chamfering processing of the plurality of air guide member and the air inlet is formed in the center; Impeller for a vacuum cleaner comprising a. The method of claim 4, wherein The chamfer is an impeller for a vacuum cleaner, characterized in that formed to satisfy the following conditions:

Here, B is the length of the width direction of the air guide member of a chamfer, C is the width of the air guide member. The method of claim 5, The length of the longitudinal direction of the air guide member of the chamfer is an impeller for a vacuum cleaner, characterized in that 1.5 ~ 3mm. motor; A disk-shaped lower plate installed on the motor shaft of the motor, An upper plate installed at a predetermined distance from the lower plate, the upper plate having the same diameter as the lower plate, and having an air inlet formed therein; An impeller radially interposed between the upper plate and the lower plate, the impeller including a plurality of air guide members chamfered at both edges of the outer end; And And a diffuser installed at an upper end of the motor and configured to direct air sucked from the impeller toward the motor. The method of claim 7, wherein The chamfer is a motor assembly for a vacuum cleaner, characterized in that formed to satisfy the following conditions:

Here, B is the length of the width direction of the air guide member of a chamfer, C is the width of the air guide member.  The method of claim 8,  The length of the longitudinal direction of the air guide member of the chamfer is a vacuum assembly motor assembly, characterized in that 1.5 ~ 3mm. motor; The lower plate of the disk shape, A plurality of air guide members radially installed on the lower plate and having chamfered edges at both ends of the outer end; An impeller installed on the plurality of air guide members, the impeller including a top plate having a diameter corresponding to a start point of the chamfers of the plurality of air guide members, and having an air inlet formed therein; And And a diffuser installed at an upper end of the motor to direct air sucked from the impeller toward the motor. The method of claim 10, The chamfer is a motor assembly for a vacuum cleaner, characterized in that formed to satisfy the following conditions:

Here, B is the length of the width direction of the air guide member of a chamfer, C is the width of the air guide member. The method of claim 11, The length of the longitudinal direction of the air guide member of the chamfer is a motor assembly for a vacuum cleaner, characterized in that 1.5 ~ 3mm.

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