JPS644771B2 - - 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. 3, the suction port body 1 is composed of a lower case 6 and an upper case 7, and the brush cleaning opening formed in the upper case 7 is connected to the lid 8.
It is designed to open and close with. Also, turbine 5
A belt 11 is wound around a pulley 9 provided at one end of the shaft 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. .

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 are connected to the turbine 5.
It was provided parallel to the axial direction of the rotation axis a.

[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, and as shown in FIG. 14, 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.

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 rotary brush is rotatably provided in the suction port main body and rotated by the suction airflow from the suction port, and the rotary brush is rotationally driven. This turbine has a turbine body integrally molded with blades that receive the intake airflow, and the blades are spirally inclined with respect to the axial direction of the rotating shaft of the turbine, and This blade inclination is characterized by being set so that a straight line parallel to the rotational axis of the turbine does not pass through two or more blades at the same time.

[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 suction airflow's impact on the blades, noise, especially high-frequency noise, generated when the suction airflow hits the blades is reduced.Furthermore, the inclination of the blades in the turbine body has two straight lines parallel to the turbine's rotation axis. By setting the above blades so that they do not pass through at the same time, the turbine body can be molded using a simple mold structure that has two molding molds that are moved toward and away from each other in the axial direction of the turbine body. It is something.

〔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 8.

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.

A rotating brush 49 is rotatably provided in the rotating brush chamber 32, and brush bristles 50 are spirally arranged on the circumferential surface of the rotating brush. The rotating brush 49 has bearings 51, 51 rotatably fitted to shafts (not shown) protruding from both end faces thereof, and these bearings 51, 51 are formed opposite to each other at both ends of the rotating brush chamber 32. By being fitted into the fitting portions 52, 52, respectively, it is rotatably held within the rotating 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.

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 at an angle β ₁ 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.
That is, a straight line passing through one end of the outer periphery of the blade 64 and parallel to the rotational axis b of the turbine 54 and this blade 64
It is inclined at an angle β ₁ with a straight line passing through one end of the outer periphery and the other end of the outer periphery.

The twist angle α of each blade 64 in the turbine body 57, that is, the straight line connecting one end of the outer circumference of the blade 64 and the rotation axis b when viewed from the direction of the rotation axis b of the turbine 54, and the other end of the outer circumference of this blade 64 and the rotation axis Angle α with the straight line connecting b
is less than 360°/number of blades. By doing so, a straight line parallel to the rotation axis b will not pass through two or more blades 64 at the same time. In other words, when viewed from the direction of the rotation axis b, 2
Since two or more blades 64 do not overlap, when the turbine body 57 is made of plastic resin such as ABS resin, two molding molds are moved toward and away from each other in the direction of the axis b of the turbine body 57, as shown in FIG. This turbine body 57 can be easily molded using a simple mold structure having A and B.

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. 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 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 rotated in this manner scrapes out dust from the carpet, etc., and this dust is sucked 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 suction airflow flowing in from the communication port 41 collides with each position of the blade 64 is shifted, and therefore, the noise generated when the suction airflow hits the blade 64, especially the harshness to the ears, is High frequency sounds are reduced.

In other words, as shown in Fig. 14, 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. 5, in the turbine 54 of this example, the level has decreased to 72 phon, and the level has particularly decreased significantly near 1000 Hz.

Next, another embodiment of the present invention will be described with reference to FIGS. 9 to 11.

In this embodiment, the turbine 54 is constructed by stacking two turbine bodies 57, 57 having the same number of blades in the direction of the rotation axis b of the turbine 54. Further, a recess 70 and a protrusion 71 as positioning parts are respectively formed at both ends of the cylindrical parts 63, 63 of the turbine main bodies 57, 57, and the turbine main body engages these recesses 70 and protrusion 71. When joined in this way, the side edges of the corresponding blades 64, 64 of the pair of turbine bodies 57, 57 are joined as shown in FIG. ，
At a position where 64 forms one continuous shape,
The recess 70 and the projection 71 are formed.

Furthermore, a convex portion 72 and a concave portion 73 that are engaged with the concave portion 70 and convex portion 71 of the turbine bodies 57, 57 are formed on both end plates 56, 58, respectively.
6, 58 is locked.

By the way, when considering the entire turbine 54, if the diameter r and the number of blades of the turbine 54 are fixed and a constant inclination angle β of the blades 64 is to be ensured, the longer the width l of the turbine 54, the more the blades 64 will be. The twist angle α must be large. Therefore, depending on the width l of the turbine 54, the twist angle α of the blades 64 must be greater than 360°/number of blades.

On the other hand, as mentioned above, the two turbine bodies 57,
57 to form the turbine 54, when the twist angle of the blades 64 in each turbine body 57, 57 is α, the twist angle of the blades in the entire turbine 54 will be 2α. Also, the 12th
As shown in the figure, three turbine bodies 57,5
7 and 57, the twist angle of the blades in the entire turbine 54 becomes 3α. Therefore, even if the twist angle α of the blades 64 in each turbine main body 57 is limited to 360°/number of blades, as shown in FIG. two turbine bodies 57 having
By overlapping the blades, the blade inclination angle β ₂ at this time is made smaller than the blade inclination angle β ₁ when the turbine 54 is configured with a single turbine body 57, as shown in FIG. It can also be made larger.
In other words, the width of each turbine body 57 is approximately 1/2,
In other words, since it can be made shorter, even if the twist angle α of the blade 64 is limited to 360°/number of blades,
This allows the blade inclination angle β ₂ to be increased.

Therefore, it is sufficient to configure the turbine 54 with a single turbine body 57 with the twist angle α of the blades 64 set to 360°/number of blades or less depending on conditions such as the diameter of the turbine 54 and the suction air volume of the vacuum cleaner. Even when the noise does not decrease, the inclination angle β of the blades 64 can be increased by configuring the turbine 54 by stacking a plurality of turbine bodies 57 as described above, and a sufficient noise reduction effect can be obtained. I can do it. That is, it is possible to select the inclination angle β of the blades 64 that meets each of the conditions described above, and it is possible to freely provide an efficient turbine 54.

Further, the plurality of turbine bodies 57 are joined by engaging the concave portions 70 and convex portions 71 formed at both ends of the turbine bodies 57, and these concave portions 70 and convex portions 71 are adjacent to each other in this way. Since the side edges of the corresponding blades 64 are formed at the positions where they are joined when the turbine bodies 57 are joined, the assembly work of the turbines 54 is facilitated, and the blades 64 of the adjacent turbine bodies 57 are not misaligned. Since no gaps are created between these blades 64, it is possible to provide a turbine 54 with stable quality.

In addition, in these embodiments, the end plates 56, 58 are brought into close contact with the turbine body 57 by being biased by the push nut 59, so that the turbine body 57 and the end plates 56, 58 can be separated into Even when the turbine body 57 and the end plate 5 are formed into a
6, 58 and the adjacent turbine body 57
Therefore, the rotational torque of the turbine 54 does not decrease due to leakage of the suction airflow from the joint.

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 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. The cleaning effect will not decrease due to
Furthermore, the inclination of the blades in the turbine body was set so that a straight line parallel to the rotational axis of the turbine would not pass through two or more blades at the same time. The turbine body can be easily molded by the mold structure, and the turbine can be constructed by, for example, joining a plurality of turbine bodies in the axial direction so that the side edges of their corresponding blades are joined. In particular, it is possible to increase the angle of inclination of the blades of the entire turbine.
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.

[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. A front view, FIG. 5 is a front view showing a method of molding the turbine body, FIG. 6 is a perspective view of the suction port body from above, FIG. 7 is a perspective view of the same from above, and FIG. 8 is a perspective view of the same from above. Plan view with part cut away, No. 9
The figure is an exploded perspective view of a turbine of a suction port body for a vacuum cleaner showing another embodiment of the present invention, FIG. 10 is a partially cutaway perspective view of the same turbine body, and FIG. 11 is a front view of the same turbine. 12 is a front view of a turbine showing still another embodiment of the present invention, and FIG.
The figure is an exploded perspective view showing an example of a conventional suction port body for a vacuum cleaner, FIG. 14 is a graph showing the results of frequency analysis of the same noise, and FIG. 15 is the result of frequency analysis of noise according to the embodiment of the present invention. It is a graph. 21...Suction port body, 40...Suction port, 43...
... Connecting pipe, 49 ... Rotating brush, 54 ... Turbine, 57 ... Turbine body, 64 ... Blade,
70... Concavity as a positioning part, 71... Convex part as a positioning part.

Claims (1)

[Scope of Claims] 1. A suction port body with a suction port opened at the bottom and a connecting pipe provided at the rear, a rotary brush rotatably provided in the main body facing the suction port, and the suction port main body. a turbine that is rotatably installed inside the turbine and is rotated by the suction airflow from the suction port and rotationally drives the rotating brush, and the turbine includes a turbine body integrally formed with blades that receive the suction airflow. The blades are spirally inclined with respect to the axial direction of the rotation axis of the turbine, and the inclination of the blades in the turbine body is such that a straight line parallel to the rotation axis of the turbine does not pass through two or more blades at the same time. A suction port body for a vacuum cleaner, characterized in that it is set as follows. 2. The turbine has a plurality of turbine bodies having an equal number of blades joined in the direction of its rotational axis, and positioning portions are formed on the joint surfaces of these turbine bodies, respectively, and adjacent turbine bodies have corresponding positioning portions. The claim is characterized in that the positioning parts are provided at positions where the side edges of the corresponding blades of the adjacent turbine bodies are joined when the adjacent turbine bodies are joined. The suction port body for a vacuum cleaner according to item 1.