JPS644770B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a suction port body for a vacuum cleaner 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 this type of suction port body for a 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 in the interior, and the turbine 5 is rotated by the suction airflow from the suction port, and the rotation of the turbine 5 rotationally drives the rotary brush 2. A structure is known in which dust is scraped out from the surface to be cleaned by a vacuum cleaner, and the dust is sucked in through a suction port. In addition, the first
In the example shown in FIG.
It is designed to open and close with. Also, turbine 5
The belt 1 is connected to a pulley 9 provided at one end of the shaft and a pulley 10 provided at one end of the rotating brush 2.
1 is wound so that the rotation of the turbine 5 is transmitted to the rotating brush 2.

Further, the turbine 5 has a structure including a pair of disc-shaped end plates 12, 12, and a plurality of blades 13 located between these end plates 12, 12 and provided radially on the side to receive wind. ing. Conventionally, these blades 13 were provided 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 described above, the suction air flowing into the turbine chamber 4 from the suction port hits the blades 13 of the turbine 5 at once, so as shown in FIG. 11, the noise generated at that time, especially the There was a problem with the high frequency sound being louder.

Therefore, in order to reduce the noise associated with the rotation of the turbine, the turbine is divided symmetrically into a right turbine and a left turbine. A structure in which they are joined in a shifted position in the middle is known (Japanese Patent Publication No. 46-23195).

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 torque of the turbine, which in turn reduces the rotational speed of the rotating brush, reducing cleaning efficiency. There was a problem with it becoming lower.

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 torque of the turbine and therefore does not reduce cleaning efficiency. The purpose is to obtain a suction port body for use.

[Means for solving problems]

A suction port body for a vacuum cleaner according to the present invention includes a suction port main body having a suction port opened on the lower surface, a connecting pipe provided at the rear part, and a turbine chamber communicating with the suction port and the connecting pipe formed therein; A rotary brush rotatably provided facing the turbine chamber, and a turbine rotatably provided in the turbine chamber and rotated by the suction airflow from the suction port and rotationally driving the rotary brush. The blades receiving the suction airflow are spirally inclined with respect to the axial direction of the rotating shaft of the turbine.

[Effect]

In the suction port body for a vacuum cleaner of the present invention, the suction airflow flowing in from the suction port of the suction port body hits the blades of a turbine and rotates the turbine, and the rotation is driven by the rotation of the turbine. The brush scrapes dust from the surface to be cleaned and suctions the dust from the suction port, and the blades are tilted with respect to the axial direction of the rotation axis of the turbine, so that when the turbine rotates, each of the blades is By shifting the timing of the impact of the suction airflow on the blade, noise, especially high-frequency sound, generated when the suction airflow hits the blade is reduced.

〔Example〕

The structure of an embodiment of the suction port body for a vacuum cleaner according to the present invention will be described with reference to FIGS. 1 to 7. 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 26 via a bumper 25. The lid body 24 also 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 slidably provided on the other side. By engaging with the bodies 30, they are detachably attached to the upper case 23.

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 on its front surface, and has a notch 42 opened on its rear surface.

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. The rotating brush 49 has bearings 51, 51 rotatably fitted to shafts (not shown) protruding from both end faces thereof.
By fitting these bearings 51, 51 into fitting parts 52, 52 formed opposite to each other at both ends of the rotating brush chamber 32, the suction port 40 on the lower surface of the rotating brush chamber 32 is inserted into the rotating brush chamber 32. It is held so that it can rotate freely. In addition, this rotating brush 50
A gear-like pulley 53 is fixed to one end of the belt, and this pulley 53 is located within the belt chamber 39 .

Reference numeral 54 denotes a turbine rotatably installed in the turbine chamber 35, which includes a disk-shaped end plate 56 successively penetrated into one side of the rod-shaped shaft 55, a turbine body 57, and a disk-shaped end plate 58. It is configured. Both side surfaces of the turbine main body 57 are closed by both end face plates 56 and 58, and are biased by a push nut 59 attached to the end of the shaft 55, so that both end face plates 56 and 58 are closed.
6 and 58 are in close contact with both side surfaces of the turbine body 57. Further, a bearing 60 is rotatably inserted through the other side of the shaft 55, and a gear-like pulley 61 is fixedly provided at the end.

Since the bearing 60 is supported by the partition walls 33 and 38 on both sides of the turbine holding chamber 36, 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 plate 58 of the turbine 54 and the partition wall 34 forms an air passage 62 from the communication port 41 to the connecting pipe 43.

The turbine main body 57 has a cylindrical tube portion 63.
and a plurality of blades 64 that protrude radially from the side surface from this cylindrical portion 63 and receive the suction airflow,
Each blade 64 is curved toward the tip in a direction opposite to the rotational direction c of the turbine 54. moreover,
These blades 64 are twisted spirally and are inclined in the rotation direction c of the turbine 54 toward the air passage 62 side with respect to the rotation axis b of the turbine 54.

Further, 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 50, and as the turbine 54 is rotated by the suction airflow, The rotary brush 50 is rotatably driven via this belt 65.

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 rear surface of the sliding plate 69 is slidably abutted to the front surface of the partition wall 31. Then, 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 rotates the turbine 54. The opening area of the communication port 41 is changed so that the rotation speed can be changed from no rotation to rotation speed.

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 62 of the turbine chamber 35, so the turbine 54 is not rotated, and therefore the rotating brush 50 is also rotated. do not. And like this, the rotating brush 50
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 50 also rotates accordingly. The rotating brush 50 thus rotated scrapes out dust from the carpet, etc., and this dust is sucked in through the suction port 40.

When the turbine 54 is rotated by the suction airflow hitting the blades 64 of the turbine 54 in this way, the blades 64 are moved around the rotating shaft b of the turbine 54.
Since the blade 64 is tilted with respect to the axial direction, the timing at which the airflow flowing in from the communication port 41 collides with each position of the blade 64 is shifted, and the noise generated when the airflow hits the blade 64, especially the harshness, is avoided. High frequency sounds are reduced.

In other words, as shown in Fig. 11, in a conventional turbine in which the blades are arranged parallel to the rotational axis of the turbine, the noise generated by the first
As shown in FIG. 2, in the turbine 54 of this example, the level has decreased to 72 phon, and the level has particularly decreased significantly near 1000 Hz.

Also, it is energized by the bush nut 59,
Since the end plates 56 and 58 are brought into close contact with the turbine body 57, even when the turbine body 57 and the end plates 56 and 58 are molded separately in this way, the turbine body 57 and the end plates 56 and 58 are Therefore, the rotational torque of the turbine 54 does not decrease due to leakage of the suction airflow from the joints or the like.

Next, another embodiment of the present invention will be described with reference to FIGS. 8 and 9.

In this embodiment, the diameter of the end plate 58 on the air passage 62 side of the turbine 54 is made smaller than the diameter of the turbine body 57, and the side surface of the turbine 54 on the air passage 62 side is opened.

By doing this, when the suction airflow that has collided with the blades 64 of the turbine 54 flows into the air passage 62, most of the suction airflow does not hit the end plate 58, so that when the turbine 54 rotates, Noise is further reduced.

That is, as shown in FIG. 13, the noise has been reduced to 71 phons, which is an even greater reduction than in the previous example, especially around 1000 Hz.

Furthermore, in order to reduce the height of the suction port body 21 as much as possible, the gap between the upper and lower surfaces of the turbine chamber 35 and the turbine 54 is made small, so that most of the airflow that hits the turbine 54 is bent laterally. The air then flows into the connecting pipe 43 via the air passage 62. On the other hand, since the blades 64 are inclined in the rotational direction c of the turbine 54 toward the air path 62 side, the suction airflow colliding with the turbine 54 sequentially hits the blades 64 and is directed toward the air path 62 side. The noise level is reduced at each frequency because the flow is smoothly bent and no vortices are generated.

〔Effect of the invention〕

According to the present invention, the blades that receive the airflow of the turbine that is rotated by the suction airflow from the suction port of the suction port body and that rotationally drives the rotating brush are inclined with respect to the axial direction of the rotating shaft of the turbine. As a result, the timing at which the suction airflow impinges on each position of this blade is shifted, and therefore the noise generated when the suction airflow hits this blade,
In particular, it can reduce harsh high-frequency sounds,
In addition, unlike when the blades are divided into left and right and the left and right blades are shifted, the intake airflow does not leak from the gap between the left and right blades, so the rotational torque of the turbine hardly decreases. Therefore, the cleaning efficiency does not decrease.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view of a suction port body for 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. 4 is the same as the above. A front view, FIG. 5 is a perspective view from above of the same suction port body, FIG. 6 is a perspective view from above and below,
FIG. 7 is a partially cutaway plan view of the same as above, FIG. 8 is a perspective view of a suction port body for a vacuum cleaner showing another embodiment of the present invention with the upper case removed, and FIG. 9 is a view of the same as the above turbine. A perspective view, FIG. 10 is an exploded perspective view showing an example of a conventional vacuum cleaner suction port body, FIG. 11 is a graph showing a frequency analysis result of the same noise, and FIG. 12 is a first embodiment of the present invention. FIG. 13 is a graph showing the results of noise frequency analysis according to the second embodiment of the present invention. 21... Suction port body, 35... Turbine chamber, 4
0... Suction port, 43... Connecting pipe, 49... Rotating brush, 54... Turbine, 62... Air path, 64...
…blade.

Claims (1)

[Scope of Claims] 1. A suction port body having a suction port opened on the lower surface, a connecting pipe provided at the rear, and a turbine chamber communicating with the suction port and the connecting pipe formed inside, and a suction port body that is rotatable facing the suction port. and a turbine that is rotatably provided in the turbine chamber and is rotated by the suction airflow from the suction port and rotationally drives the rotary brush, and receives the suction airflow of the turbine. A suction port body for a vacuum cleaner, characterized in that the blades are spirally inclined with respect to the axial direction of the rotating shaft of the turbine. 2. 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 electric cleaner according to claim 1, characterized in that an air passage is formed on the other side, and the blades of the turbine chamber are inclined toward the air passage side in the rotational direction of the turbine. Air intake body. 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 turbine chamber is separated by a gap between one side surface of the turbine and the side surface of the turbine chamber opposite to this surface. 3. The suction port body for a vacuum cleaner according to claim 1, wherein an air passage is formed on the other side, and a side surface of the turbine on the air passage side is opened.