JPS644774B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a vacuum cleaner suction port body equipped with a rotating brush that scrapes dust from a surface to be cleaned. This invention relates to the structure of a rotationally driven turbine.

[Conventional technology]

In the suction port body of this type of vacuum cleaner, the first
As shown in FIG.
A turbine chamber 4 is partitioned into the main body 1 and communicates with the suction port and a connecting pipe 3 provided on the rear side of the main body 1 so as to be freely movable up and down. A turbine 5 is rotatably provided inside the turbine chamber 4, and the turbine 5 is rotated by the suction airflow blown from the suction port to the turbine 5 through a communication port 4a formed on the front surface of the turbine chamber 4. The rotary brush 2 is rotationally driven by the rotation of the rotary brush 2.
Scrapes out dust from the surface to be cleaned by rotating the
A structure is known in which this dust is sucked in through a suction port. In the example shown in FIG. 10, the suction port main body 1 includes a lower case 6 and an upper case 7.
A brush cleaning opening formed in the upper case 7 is opened and closed by a lid 8. Further, a belt 11 is wound around a pulley 9 provided at one end of the shaft of the turbine 5 and a pulley 10 provided at one end of the rotating brush 2, so that the rotation of the turbine 5 is transmitted to the rotating brush 2. It's getting old.

Further, the turbine 5 has a structure including a pair of disc-shaped end walls 12, 12, and a plurality of blades 13 located between these end walls 12, 12 and provided radially on the side to receive wind. ing. Conventionally, these blades 13 have been provided entirely parallel to the axial direction of the rotation axis a of the turbine 5.

[Problem that the invention seeks to solve]

In the structure of the conventional turbine 5, the suction airflow flowing into the turbine chamber 4 from the suction port through the communication port 4a simultaneously hits the parallel blades 13 of the turbine 5 with respect to the communication port 4a. As shown in the figure, there was a problem in that the noise generated at that time, especially the harsh high-frequency sound, became louder.

Therefore, in order to reduce the noise caused by the rotation of the turbine, the turbine is divided symmetrically into a right turbine and a left turbine. A structure is known in which the joints are shifted so that they are located in the middle of the
Publication No.).

By adopting such a structure, the area of the blade that is hit by the suction airflow at one time can be halved, so that noise can be reduced to some extent.

However, in this structure, since one blade is shifted so as to be located between the other adjacent blades, a gap is created between the left and right blades. As a result, the suction airflow leaks through this gap, making it impossible to efficiently rotate the turbine with the suction airflow, reducing the rotational force of the turbine, which in turn reduces the rotational force of the rotating brush, resulting in low cleaning efficiency. A problem arose.

An object of the present invention is to provide a vacuum cleaner that can reduce noise generated when a turbine rotates, particularly harsh high-frequency sounds, and that does not reduce the rotational force of the turbine and therefore does not reduce cleaning efficiency. The purpose is to obtain a suction port body.

[Means for solving problems]

The suction port body of the vacuum cleaner of the present invention includes a suction port body in which a turbine chamber is formed inside which has a suction port opened at the bottom and a communication port communicating with the suction port, and the suction port inside the suction port body. a rotary brush that is rotatably provided facing the turbine chamber; and a turbine that is rotatably provided in the turbine chamber and is rotated by the suction airflow from the communication port and rotationally drives the rotary brush. The blades that receive the intake airflow include an inclined part that is spirally inclined with respect to the axial direction of the rotating shaft of the turbine, and a parallel part that is located continuously on the side of this inclined part and parallel to the axial direction of the rotating shaft of the turbine. The turbine blade is characterized in that the inclined portion of the blade is provided at a position facing the communication port.

[Effect]

In the suction port body of the vacuum cleaner of the present invention, the suction airflow that flows into the turbine chamber from the suction port of the suction port body through the communication port hits the blades of the turbine and rotates the turbine. A rotating brush that is rotationally driven by the rotation scrapes dust from the surface to be cleaned and sucks the dust from the suction port. By causing the suction airflow from the communication port to collide with the sloped part of the blade facing the mouth, the timing of the impact of the suction airflow on each position of the sloped part of the blade is shifted, and this occurs when the suction airflow hits the blade. In addition to reducing noise, especially high-frequency sounds, the airflow that is bent after colliding with the sloped part of this blade is efficiently received by the parallel part located continuously on the side of the sloped part of this blade, which increases the rotation of the turbine. It improves strength.

〔Example〕

The structure of an embodiment of the suction port body of a vacuum cleaner according to the present invention will be explained with reference to FIGS. 1 to 6. FIG.

Reference numeral 21 denotes a suction port body, which includes a box-shaped lower case 22 with an open top, and an upper case 23 attached to the lower case 22 so as to cover the top opening.
and a lid 24 that opens and closes a rotating brush cleaning opening formed on the front side of the upper case 23.

The upper case 23 is attached to the lower case 22 with screws through a bumper 25. Also,
The lid body 24 has engaging protrusions 27 and 28 formed on both sides thereof, an engaging hole 29 formed on one side of the upper case 23, and an opening/closing knob 30 slidably provided on the other side. are removably attached to the upper case 23 by being engaged with each other.

The inside of the suction port main body 21 is provided with a rotating brush chamber 3 on the front side by a partition wall 31 extending in the longitudinal direction.
2 is partitioned, and on the rear side of the partition wall 31 is a pair of partition walls 33 and 34 extending in the transverse direction.
It is divided into a turbine chamber 35 in the center, a turbine holding chamber 36 on one side, and an operation knob chamber 37 on the other side. is the partition wall 38
The belt chamber 39 is partitioned by.

A suction port 4 is provided on the lower surface of the brush chamber 32.
0 is open. Further, the turbine chamber 35
communicates with the brush chamber 32 through a communication port 41 opened at its front surface, and this communication port 41
The side edge on the partition wall 33 side is bent rearward approximately perpendicularly. Furthermore, a notch 42 is opened at the rear surface of the turbine chamber 35 .

Reference numeral 43 denotes a connecting pipe rotatably provided on the rear side of the suction port main body 21, which is composed of a pipe main body 44 and a rotating pipe 45 rotatably provided on the rear side of the pipe main body 44. ing. The front side of the pipe body 44 is formed into a semi-cylindrical part 47 having an opening 46 on the front surface, and the connecting pipe 43 has a shaft part 48 formed on both sides of this semi-cylindrical part 47 in the turbine chamber. 35
It is attached to the rear side of the suction port main body 21 so as to be vertically movable by being rotatably supported by partition walls 33 and 34 on both sides of the suction port body 21 . Note that the rotation tube 45 is deviated toward the partition wall 34 with respect to the semi-cylindrical portion 47.

Reference numeral 49 denotes a rotary brush that is rotatably provided in the rotary brush chamber 32, and has brush bristles 50 spirally planted on its peripheral surface. Bearings 51 are rotatably fitted into shafts (not shown) protruding from both end surfaces of the rotating brush 49, and these bearings 51 are fitted into fitting portions 52 formed opposite to both ends of the rotating brush chamber 32. By being fitted into the rotary brush chamber 32, the rotary brush chamber 32 is rotatably held in the rotary brush chamber 32 facing the suction port 40 on the lower surface thereof. Further, a gear-like pulley 53 is fixed to one end of the rotating brush 49, and this pulley 53 is located within the belt chamber 39.

A turbine 54 is rotatably provided in the turbine chamber 35, and includes a cylindrical tube portion 55 and disk-shaped end walls 56 formed at both ends of the tube portion 55.
a, 56b, and a plurality of blades 57 located between these end walls 56a, 56b and protruding radially from the side surface of the cylindrical portion 55. Further, one side of a rod-shaped shaft 58 is passed through the cylindrical portion 55 of the turbine 54, and the turbine 54 is connected to the shaft 58 by a push nut 60 that is attached to one end of the shaft 58 via a washer 59. Fixed. Further, a bearing 61 is rotatably inserted through the other side of the shaft 59, and a gear-shaped pulley 62 is fixedly provided at the end thereof.

The bearing 61 is supported by the partition walls 33 and 38 on both sides of the turbine holding chamber 36, so that the turbine 54 is rotatably held within the turbine chamber 35. At this time, the turbine 54
As shown in the figure, it is deviated in the axial direction of the rotating shaft b in the turbine chamber 35 and toward the partition wall 33, and therefore, at the opening 46 of the connecting pipe 43, it is deviated toward the partition wall 33. The gap between the end wall 56a of the turbine 54 and the partition wall 34 is the communication port 41.
An air passage 63 is formed from the connecting pipe 43 to the connecting pipe 43.

A belt 65 is stretched between a pulley 61 of the turbine 54 located in the belt chamber 39 and a pulley 53 of the rotating brush 49, and as the turbine 54 is rotated by the suction airflow, A rotary brush 49 is rotatably driven via this belt 65.

Each blade 57 of the turbine 54
are each curved toward the tip in a direction opposite to the rotational direction c of the turbine 54. Furthermore, each blade 57 has a continuous downstream parallel portion 57a and an inclined portion 57b, each having a width that is approximately one-third of the axial length of the rotating shaft b of the turbine 54.
and an upstream parallel portion 57c. Then, the downstream parallel portion 57a and the upstream parallel portion 57
c is the wind path 63 in the turbine 54, respectively.
It is located on the side opposite to this air passage 63 and parallel to the axial direction of the rotating shaft b of the turbine 54 . Further, the inclined portion 57b
is located in the center of the turbine 54, and the inclined portion 57b on the air passage 63 side has an inclination angle α in the direction leading in the rotation direction c of the turbine 54 with respect to the axial direction of the rotation axis b of the turbine 54. It is slanted at. Here, the inclination angle α is the angle between a straight line passing through one end of the outer circumference of the inclined part 57b and parallel to the rotating shaft b of the turbine 54, and a straight line passing through one end of the outer circumference and the other end of the outer circumference of the inclined part 57b. be. Further, the side of the inclined portion 57b that precedes the rotational direction c of the turbine 54 becomes the downstream side of each blade 57, and the opposite side becomes the upstream side, so the downstream parallel portion 57a and the upstream parallel portion 57c are respectively Each blade 57 is located on the downstream side and the upstream side.

The turbine 54 is divided at the boundary between the downstream parallel portion 57a and the inclined portion 57b, and the boundary between the inclined portion 57b and the upstream parallel portion 57c, and is integrally formed with the turbine on the air passage 63 side. The main body 54a and the central turbine main body 54
b and the turbine body 54c on the opposite side of the air passage 63 are joined in the direction of the rotation axis b of the turbine 54.

Reference numeral 66 designates an operating knob body slidably provided in the operating knob chamber 37, and has an operating portion 67 that projects upward. It protrudes from the moving hole 68. Further, a sliding plate 69 is fixed to the front side of the operating knob 66, and the side edge on the communication port 41 side is bent approximately vertically toward the rear.
The rear surface of the partition wall 31 is slidably abutted against the front surface of the partition wall 31. By sliding the operating knob 66, the sliding plate 69 opens or partially closes the communication port 41, and the intake airflow from the communication port 41 into the turbine chamber 35 flows into the turbine 54.
The opening area of the communication port 41 is changed so that the speed is changed from not rotating to rotating.

Furthermore, when the opening area of the communication port 41 is reduced, the positional relationship between the communication port 41 and the turbine 54 is set so that the communication port 41 faces the inclined portion 57b of the blade 57 of the turbine 54. has been done.

Next, the operation of this embodiment will be explained.

When cleaning tatami mats, floors, etc., use the operating knob 6.
6 to increase the opening area of the communication port 41. At this time, the speed of the suction airflow from the communication port 41 becomes small and most of it flows directly into the air passage 63 of the turbine chamber 35, so the turbine 54 is not rotated, and therefore the rotating brush 49 is also rotated. do not. And like this, the rotating brush 49
Dust from the floor etc. is sucked in through the suction port 40 without rotating.

On the other hand, when cleaning a carpet or the like, the operating knob 66 is slid to reduce the opening area of the communication port 41. At this time, the speed of the suction airflow from the communication port 41 increases, and the turbine 54
This turbine 54
is rotated, and the rotating brush 49 also rotates accordingly. The rotating brush 49 thus rotated scrapes out dust from the carpet, etc., and this dust is sucked in through the suction port 40.

Here, the blades 5 of the turbine 54 are
The situation when the turbine 54 rotates when the suction airflow hits the turbine 7 will be explained with reference to FIG. In this drawing, one blade 5 is receiving the suction airflow.
7 is shown, the other blades 57 are omitted, and the direction and length of the arrows represent the direction and speed of the suction airflow.

When the suction airflow passes through the communication port 41, its flow velocity V ₀ becomes the highest. After passing through the communication port 41,
The suction airflow diffuses, and its flow velocity V ₁ also gradually decreases (V ₁ <V ₀ ). Then, the suction airflow having the flow velocity V ₁ is applied to the rotating shaft b of the turbine 54 on the inclined portion 57b of the blade 57 facing the communication port 41.
Collision occurs from a direction substantially perpendicular to the axial direction. that time,
Since this inclined portion 57b is inclined with respect to the direction of the rotation axis b of the turbine 54, this inclined portion 57b
The timing at which the suction airflow collides with the blade 57 is shifted, so that the noise generated when the suction airflow hits the blade 57, particularly the harsh high-frequency sound, is reduced.

Here, the fact that the noise is reduced compared to the conventional turbine will be explained based on the noise frequency analysis results shown in FIGS. 11 and 12. In addition,
In these drawings, the graph on the left shows the sound pressure level (in dB) at each frequency, and the graph on the right shows the noise value (in phon).
The same applies to FIG.

That is, as shown in Fig. 11, in the conventional turbine in which the entire blade is arranged parallel to the rotational axis of the turbine, the noise value was 79.5 phon, but as shown in Fig. 12, the noise value in this example was 79.5 phon. For turbine 54, it has decreased to 75.5 phon. In addition, in conventional turbines, around 1500Hz and 3000Hz,
74dB peak d and 73dB peak e respectively
However, in the turbine 54 of this example, no peak near 1500 Hz is observed, and the peak f near 3000 Hz is also reduced to 69 dB.

Then, after colliding with the inclined portion 57b of the blade 57, the suction airflow is bent left and right and diffused, and the flow velocity V ₂ also becomes smaller. (V ₂ <V ₁ ). The airflow having the flow velocity V ₂ passes through both the parallel parts 57a, 57c of the blade 57, especially the downstream parallel part 57a, but in this case, both the parallel parts 57a, 57
c is parallel to the direction of the rotational axis b of the turbine 54, so the suction airflow passes through the blades 57 to their full width, and wind energy is efficiently converted into rotational energy of the turbine 54. The rotational force of the turbine 54 is maintained at a high level, and the rotational force of the rotating brush 49 driven by the turbine 54 does not decrease, so that the cleaning efficiency does not decrease.

Furthermore, if the gap between the upper and lower surfaces of the turbine chamber 35 and the turbine 54 is reduced in order to reduce the height of the suction port body 21 as much as possible, most of the airflow that hits the blades 57 will be curved laterally. The air then flows into the connecting pipe 43 via the air passage 63. On the other hand, the slope of the slope portion 57b of the blade 57 is
3 side is inclined in the rotational direction c of the turbine 54, so the suction airflow that collides with the inclined part 57b is smoothly bent and flows toward the air passage 63 side, and no vortices or the like are generated. Therefore, the overall noise level is reduced. In addition, since a parallel portion 57a is provided on the air path 63 side of the blade 57, that is, on the downstream side, most of the airflow passes through this downstream side parallel portion 57a, so that the rotational force of the turbine 54 is will be further improved.

In addition, in this way, the blades 57 of the turbine 54
The wind path 63 side of the inclined portion 57b is connected to the turbine 54.
Even when the turbine 54 is tilted in the opposite direction instead of leading in the rotational direction c, although the noise is slightly louder than the noise generated by the turbine 54 of the above embodiment shown in FIG. Compared to the noise caused by the turbine, the noise is greatly reduced as shown in FIG. 13. In other words, the noise value is
This has been reduced to 76 phons compared to 79.5 phons for conventional turbines. Also, the peak around 1500Hz is not observed, and the peak g around 3000Hz is also lower than that of the conventional turbine.
It has decreased from 73dB to 70dB.

Note that the twist angle β of the sloped portion 57b of each blade 57 in the turbine body 54b in which the sloped portion 57b of the blade 57 is integrally molded, that is, the twist angle β of the sloped portion 57b of the blade 57, when viewed from the direction of the rotation axis b of the turbine 54, is If the angle β between the straight line connecting the rotating shaft b and the straight line connecting the other end of the outer periphery of the inclined portion 57b and the rotating shaft b is 360°/number of blades, then there are two straight lines parallel to the rotating shaft b. The blades 57 will not pass through the inclined portions 57b of the blades 57 at the same time. That is, since the inclined portions 57b of two or more blades 57 do not overlap when viewed from the direction of the rotation axis b, when the turbine body 54a is made of plastic resin such as ABS resin, as shown in FIG. This turbine main body 54b can be easily molded by a simple mold structure having two molding molds A and B that are moved toward and away from each other in the direction of the axis b of the main body 54b.

Further, as shown in FIG. 9, the diameter of the end wall 56a on the side of the air passage 63 of the turbine 54 is made smaller than the diameter of the entire turbine 54, so that the air passage 63 of the turbine 54 is made smaller than the diameter of the entire turbine 54.
If the side surface on the third side is opened, when the suction airflow that collides with the blades 57 of the turbine 54 flows into the air passage 63, most of this suction airflow will not hit the end wall 56a, so that when the turbine 54 rotates, the suction airflow will not hit the end wall 56a. Noise is further reduced.

Further, in the above embodiment, the blade 57 of the turbine 54 has a structure in which the parallel parts 57a and 57c are provided on both sides of the inclined part 57b, but the parallel part is provided on one side of the inclined part, especially on the downstream side. may be provided only.

〔Effect of the invention〕

According to the present invention, the blades of the turbine that are rotated by the suction airflow flowing into the turbine chamber from the suction port of the suction port main body through the communication port and that receive the airflow of the turbine that rotationally drive the rotary brushes are It consists of an inclined part that is inclined with respect to the axial direction of the rotating shaft and a parallel part that is parallel to the axial direction of the rotating shaft of the turbine.The communicating port is placed opposite to the inclined part of the blade, so that the suction can be drawn from the communicating port into this inclined part. When the airflow is blown, the timing at which the suction airflow collides with each position of this slope is shifted, so that the noise generated when the suction airflow hits the blade, especially the harsh high-frequency sound, can be reduced, and the blade The airflow after colliding with the inclined part of the turbine can be efficiently received by the parallel part located on the side of the turbine, so the rotational force of the turbine does not decrease, thus reducing noise without reducing cleaning efficiency. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a suction port body of a vacuum cleaner showing an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same turbine, FIG. 3 is a perspective view of the same turbine, and FIG.
The figure is a perspective view from above of the same suction port body, Figure 5 is a perspective view of the same from above and below, Figure 6 is a partially cutaway plan view of the same, and Figure 7 is the same as above where the suction airflow hits the blades of the turbine. Action explanatory diagram showing the situation, No. 8
The figure is an explanatory diagram showing the method of molding the turbine body as above,
Fig. 9 is a perspective view of a turbine showing another embodiment of the present invention, Fig. 10 is an exploded perspective view showing an example of a suction port body of a conventional vacuum cleaner, and Fig. 11 is a frequency analysis of the noise of the same turbine. Graphs showing the results, FIG. 12 is a graph showing the frequency analysis results of the noise of the turbine shown in the first embodiment of the present invention, and FIG. 13 is a graph showing the results of the frequency analysis of the noise of the turbine shown in the first embodiment of the present invention. It is a graph which shows the frequency analysis result of the noise of the turbine whose inclination is reversed. 21... Suction port body, 35... Turbine chamber, 4
0... Suction port, 41... Communication port, 49... Rotating brush, 54... Turbine, 57... Blade, 5
7a, 57c...parallel part, 57b...slanted part, 6
3...Wind path.

Claims (1)

[Scope of Claims] 1. A suction port body with a suction port opened at the bottom and a turbine chamber formed therein having a communication port communicating with the suction port, and a suction port body that faces the suction port and is rotatable inside the suction port body. and a turbine that is rotatably provided in the turbine chamber and is rotated by the suction airflow from the communication port and rotationally drives the rotary brush, blades that receive the suction airflow of the turbine. consists of an inclined part that is spirally inclined with respect to the axial direction of the rotating shaft of this turbine, and a parallel part that is located continuously on the side of this inclined part and parallel to the axial direction of the rotating shaft of the turbine, and this A suction port body for a vacuum cleaner, characterized in that an inclined portion of a turbine blade is provided at a position facing the communication port. 2. Claim 1, characterized in that the parallel portion of the blade of the turbine is provided at least on the downstream side of the inclined portion of the blade, which is the side where the inclined portion precedes in the rotational direction of the turbine. The suction port body of the vacuum cleaner described in Section 1. 3. The turbine is provided within the turbine chamber so as to be offset to one side in the axial direction of the rotating shaft of the turbine, and the gap between one side surface of the turbine and the side surface of the turbine chamber opposite to this surface allows the turbine chamber to be An air passage is formed on the other side, and the slope of the inclined part of the blade of the turbine is such that the air passage side is inclined in the direction of rotation of the turbine, and the parallel part of the blade of the turbine is formed on the inclined part of the blade. The suction port body for a vacuum cleaner according to claim 2, characterized in that it is provided at least on the downstream side and on the air path side.