JPS644772B2 - - 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 eighth
As shown in the figure, a rotary brush 2 is rotatably provided facing a suction port (not shown) formed on the front side of the lower surface of the suction port main body 1, and a rotary brush 2 is rotatably provided between the suction port and the main body 1.
A turbine chamber 4 is defined in the main body 1 and communicates with a connecting pipe 3 provided vertically movably on the rear side, and a turbine 5 is rotatably provided in the turbine chamber 4. The turbine 5 is rotated by the suction airflow from the
The rotation of the rotating brush 2 is driven by the rotation of the rotating brush 2;
A structure is known in which dust is scraped out from the surface to be cleaned by the rotation of the rotating brush 2, and the dust is sucked in through a suction port. In the example shown in FIG. 8, the suction port main body 1 is composed of a lower case 6 and an upper case 7, and a brush cleaning opening formed in the upper case 7 is opened and closed by a lid 8. It's summery. 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 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 have been 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 airflow 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. 9, 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 caused by the rotation of the turbine, the turbine is divided symmetrically into a right turbine and a left turbine, each of which has blades having half the width of the turbine. A structure is known in which the side edges of one blade are offset and joined so that they are located midway between the side edges of adjacent blades on the other side (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, the side edge of one blade is shifted so as to be located midway between the side edges of the other adjacent blade, so 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.

It is an object of the present invention to reduce the noise generated when a turbine rotates, particularly harsh high-frequency sounds, and to prevent the rotational torque of the turbine from decreasing, thereby preventing the cleaning efficiency from decreasing. To obtain a suction port body for a vacuum cleaner whose turbine can be easily molded and which can realize sufficient noise reduction in accordance with conditions such as the diameter of the turbine and the suction air volume of the vacuum cleaner.

[Means for solving problems]

The suction port body for a vacuum cleaner of the present invention includes a suction port body having a suction port opened on the lower surface and a connecting pipe provided at the rear part;
A rotary brush is rotatably provided in the main body facing the suction port, and a turbine is rotatably provided in the suction port main body and is rotated by the suction airflow from the suction port and rotationally drives the rotary brush. The turbine has a plurality of turbine bodies joined in the axial direction of the rotating shaft of the turbine each having a blade for receiving the intake airflow, and the blades of the turbine bodies are connected in the axial direction of the rotating shaft of the turbine. The blades of the plurality of turbine bodies are alternately shifted so that one of the adjacent turbine bodies is tilted spirally with respect to the direction of rotation and has a width substantially equal to the width in the rotation axis direction of the turbine. The blades of the other turbine body are disposed between the blades of the other turbine body and joined together.

[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 The timing of the impingement of the suction airflow on the blades is staggered to reduce noise, particularly high-frequency sound, generated when the suction airflow impinges on the blades, and the turbine further includes blades each having a width substantially equal to the width of the turbine. By configuring the formed plurality of turbine bodies by alternately shifting the blades and arranging and joining them in the axial direction of the rotating shaft of the turbine, for example, the number of spirally inclined blades in each turbine body can be increased. This makes it easier to mold the turbine body by reducing the number of blades, while also ensuring a sufficient number of blades for the entire turbine.

〔Example〕

The structure of one embodiment of the suction port body for a vacuum cleaner of the present invention will be described 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 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 49
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 that is successively penetrated through one side of the rod-shaped shaft 55, and a pair of disk-shaped end plates 56 that are connected in the direction of the rotation axis b of the turbine 54. It is composed of turbine bodies 57a and 57b and a disk-shaped end plate 58. Both turbine bodies 5
The outer side surfaces of 7a and 57b are respectively end plates 5.
6, 58 and a push nut 59 attached to the end of the shaft 55.
, the end plates 56 and 58 are brought into close contact with the side surfaces of the respective turbine bodies 57a and 57b. Further, a bearing 6 is provided on the other side of the shaft 55.
0 is rotatably inserted therethrough, and a gear-shaped pulley 61 is fixedly installed 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. 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.

Each of the turbine bodies 57a, 57b consists of a cylindrical tube portion 63 and a plurality of blades 64 that protrude radially from the side surface of the tube portion 63 and receive the intake airflow. It is curved in a direction opposite to the rotational direction c of 54. Furthermore, these blades 64 are twisted spirally and are tilted at an angle β in the rotational direction c of the turbine 54 toward the wind path 62 side with respect to the rotational axis b of the turbine 54, that is, one end of the blade 64 passes through the turbine 54. The blade 64 is inclined at an angle β between a straight line parallel to the rotation axis b of the blade 54 and a straight line passing through one end and the other end of the blade 64. In addition, both turbine bodies 5
The cylindrical portions 63, 63 of 7a, 57b are each formed to have a width equal to the entire width of the turbine 54, that is, approximately half the length of the turbine 54 in the direction of the rotation axis b, and the blades 64 each have a width equal to the entire width of the turbine 54. The widths of both turbine bodies 5 are approximately equal to each other.
In 7a, 57b, each blade 64 has a lateral half thereof protruding from the cylindrical portion 63, 63 toward the joint surface with the other turbine main body 57b, 57a.

Both turbine bodies 57a, 57b
When joining, one turbine body 57
The cylindrical portion 63 of the other turbine main body 57b is fitted into the gap between the inner edges of the blades 64 of the first turbine main body 57a, so that the blades 64 of one turbine main body 57a are located between the adjacent blades 64 of the other turbine main body 57b. The blades 64 are alternately staggered and connected.

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.

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. By sliding the operating knob 66, the sliding plate 69 opens or partially closes the communication port 41, and the airflow sucked into the turbine chamber 35 from the communication port 41 does not rotate the turbine 54. The opening area of the communication port 41 is changed so as to change the 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 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 operation 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.

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. 9, in a conventional turbine in which the blades are arranged parallel to the rotational axis of the turbine, the noise level is 81 phon,
As shown in the figure, in the turbine 54 of this example, the level has decreased to 72 phon, and the level has particularly decreased significantly near 1000 Hz.

By the way, the twist angle α of each blade 64 in each turbine body 57a, 57b, that is, when viewed from the direction of the rotation axis b of the turbine 4, the straight line connecting one end of the blade 64 and the rotation axis b, the other end of this blade 64, and the rotation Angle α with the straight line connecting axis b
If it is less than 360°/number of blades, the rotation axis b
A straight line parallel to will not pass through two or more blades 64 at the same time. That is, since two or more blades 64 do not overlap when viewed from the direction of the rotation axis b, these turbine bodies 57a, 57b
When manufacturing the turbine body 57a from plastic resin such as ABS resin, as shown in FIG.
These turbine bodies 57a and 57b 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 turbine body 57b.

If the twist angle α of the blades is limited in this way, the angle of inclination β of the blades will also be limited to a certain value or less, so depending on conditions such as the diameter of the turbine and the suction air volume of the vacuum cleaner, If the turbine is configured with one turbine body, the noise may not be reduced sufficiently. However, as described above, the turbine 54 has a pair of turbine bodies 57a and 57b formed with blades 64 having a width substantially equal to the width of the turbine body 54, and these blades 64 are alternately shifted and joined together. , blades 6 in each turbine body 57a, 57b
4 can be reduced, and therefore, the upper limit of the twist angle α of the blade 64 (360°)/number of blades can be increased. That is, the turbine 54
Since the twist angle α of the blade 64 can be increased without reducing the total number of blades, the inclination angle β of the blade 64 can also be increased.

Furthermore, if the twist angle α and the inclination angle β of the blades 64 are fixed, the plurality of turbine bodies 57
By stacking a and 57b, the number of blades can be increased.

In this way, the plurality of turbine bodies 57a, 57
By configuring the turbine 54 by stacking the turbine bodies 57a and 57b, the inclination angle β of the blades 64 can be increased during molding of the turbine bodies 57a and 57b, or by changing the number of blades in each of the turbine bodies 57a and 57b, the entire turbine 54 can be Since the number of blades can be freely selected, the specifications of the turbine 54 can be arbitrarily designed in accordance with each of the conditions described above, the design range is expanded, and sufficient noise reduction can be achieved.

In addition, it is energized by the push nut 59,
End plates 56, 58 are provided on the turbine bodies 57a, 57b.
Since the turbine bodies 57a, 57b and the end plates 56, 58 are molded separately in this way, even when a plurality of turbine bodies 57a, 57b are provided, these turbine bodies 57a, 57b and the end plates The suction airflow does not leak from the joints with the turbine bodies 56 and 58 or the joints between the adjacent turbine bodies 57a and 57b, and therefore the rotational torque of the turbine 54 does not decrease due to leakage of the suction airflow from the joints. do not have.

Furthermore, if the gap between the upper and lower surfaces of the turbine chamber 35 and the turbine 54 is made smaller in order to reduce the height of the suction port body 21 as much as possible, most of the airflow that hits the turbine 54 will bend 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 blades and the left and right blades are shifted, the intake airflow does not leak from the gap between the left and right blades, each having half the width of the turbine, so the rotational torque of the turbine is hardly reduced, and therefore the cleaning efficiency is not reduced.Furthermore, the turbine includes a plurality of turbine bodies forming blades each having a width substantially equal to the width of the turbine, and the blades are alternately arranged. Since the blades are arranged and joined together in the axial direction, the number of blades in each turbine body can be reduced to facilitate the molding of this turbine body, and the inclination angle of the blades can be increased during molding. By combining multiple turbine bodies, the number of blades in the entire turbine can be increased, and therefore sufficient noise reduction can be achieved depending on conditions such as the diameter of the turbine and the suction air volume of the vacuum cleaner. It is something.

[Brief explanation of the drawing]

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. FIG. 5 is a perspective view from above of the suction port body; FIG. 6 is a partially cutaway plan view of the same; FIG. 7 is a front view showing a method of molding the turbine body; FIG. 8 is an exploded perspective view showing an example of a conventional vacuum cleaner suction port body, FIG. 9 is a graph showing the results of frequency analysis of the same noise, and FIG. 10 is the result of frequency analysis of noise according to the embodiment of the present invention. This is a graph showing. 21...Suction port body, 40...Suction port, 43...
... Connecting pipe, 49 ... Rotating brush, 54 ... Turbine, 57a, 57b ... Turbine body, 64 ...
blade.

Claims (1)

[Claims] 1. A suction port body with a suction port opened on the lower surface and a connecting pipe provided at the rear, a rotary brush rotatably provided in the main body facing the suction port, and a rotatably provided in the suction port main body. and a turbine that is rotated by the suction airflow from the suction port and rotationally drives the rotary brush, and the turbine is connected in the axial direction of the rotating shaft of the turbine, each of which has blades that receive the suction airflow. The blades of these turbine bodies are spirally inclined with respect to the axial direction of the rotation axis of the turbine and each has a width approximately equal to the width in the rotation axis direction of the turbine. A suction port body for a vacuum cleaner, characterized in that the blades of the turbine bodies are alternately shifted and the blades of the other turbine body are disposed and joined between the blades of one turbine body in adjacent turbine bodies. .