JPS61263434A - Floor nozzle for vacuum cleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a floor nozzle for a vacuum cleaner equipped with a rotating brush driven by an air turbine.

Conventional technology Conventionally, in this type of floor nozzle for vacuum cleaners, the air turbine that serves as the driving source for the rotating brush has a large number of turbine blades each having an arcuate cross section arranged at equal intervals on a disc-shaped side plate, and having a circular shape. A so-called once-through turbine was used.

The rotational force of the air turbine driven by the airflow sucked into the vacuum cleaner is transmitted to the rotating brush via an intermediate transmission means such as a belt.

Problems to be Solved by the Invention Incidentally, in a once-through type turbine, the working airflow swirls with the turbine blades on the inflow side and the outflow side, so a high rotational speed can be obtained, and accordingly, the same rotational region The torque is also high. However, since the airflow flows through the once-through type turbine, it has poor start-up characteristics. For example, if the floor nozzle is started with the floor nozzle in contact with a surface to be cleaned such as a carpet, the turbine may not rotate or There was a problem in which it took a long time to reach the specified rotation range.To prevent this, reducing the distance between the vent facing the turbine and the turbine will improve torque, but the inhaled dust will cause problems between the vent and the turbine. There have been problems with the turbine blades getting stuck between the vents and the high-speed air flowing through the vents passing through the turbine blades, causing a high-pitched sound.

The present invention solves these conventional problems and provides a floor nozzle for a vacuum cleaner that is easy to use, has excellent dust suction performance, and has low noise.

Means for Solving the Problems In order to solve these conventional problems, the present invention comprises an air turbine that serves as a driving source for the rotating brushes by combining a once-through type turbine and a reciprocating type turbine. The recirculating turbine is cylindrical, the once-through turbine is conical, and the conical once-through turbine is arranged in the flow direction of the suction airflow, and the number of blades of the once-through turbine and the number of blades of the recirculating turbine are are chosen to have values that do not have the greatest common divisor of each other, to improve torque and disperse sound, and to increase the distance between the intake port and the turbine.

In a recirculating type turbine, the airflow that collides with the blades does not escape in the radial direction like in a once-through type turbine, so while the torque at startup is extremely high, as the rotational speed increases, this torque decreases. It's coming. On the other hand, once-through turbines have the opposite characteristics as described above.

Therefore, when these two turbines are combined to form one air turbine, the rising characteristics can be supplemented by the backflow type turbine, and the characteristics during steady rotation can be ensured by the once-through type turbine.

Furthermore, since the number of blades of the once-through type turbine and the recirculating type turbine are different, the rotational torque generated when the airflow from the vent collides with the blades is generated with a difference. In other words, since the torque is generated in a temporally staggered and distributed manner, there is little torque fluctuation during rotation, and stable rotation can be obtained.

For this reason, even if the distance between the turbine and the intake port is large,
Torque is stable and rotational performance is kept high, and the distance from the vent to the blade is large, so noise can be kept low. In addition, since the number of blades of the once-through type turbine and the double-flow type turbine are selected to be different numbers that do not have the greatest common divisor, the generation of sound is also dispersed, resulting in even lower noise. I can do it.

Furthermore, because the once-through turbine is conical and has a large distance from the vent, and the distance increases further as it advances in the flow direction, dust does not get stuck between it and the vent, improving dust suction performance. .

Example Examples thereof will be described below with reference to the accompanying drawings.

In Figures 1 to 6, the floor nozzle body 1 is the bumper 2.
It is constructed by connecting upper and lower body members 3 and 4 via a . be. The turbine chamber 6 is separated from the suction chamber 6 by a partition wall 7, and has a generally cylindrical shape as a whole. Reference numeral 8 denotes a rotating brush that is provided in parallel to the suction chamber 6, with a part of the brush body 1o implanted in the rotor 9 protruding to the outside through the suction port; 11 is a rotating brush on both sides of the suction chamber 6; A bearing 13 is provided on the chamber wall and supports a shaft 12 protruding from the rotating brush 8 to both sides. It is a set of wheels.

Reference numeral 14 denotes a substantially semi-cylindrical suction joint rotatably attached to the inner surface of the turbine chamber 6 in the vertical direction, and a cylindrical connection port 15 is formed in a part of the peripheral wall of the suction joint.

The suction joint 14 has a shaft 16 projecting outward from its side wall.
A hollow shaft 17 is pivotally supported on both side walls of the turbine chamber 6. Reference numeral 18 denotes a connecting tube rotatably attached to the connecting port 15 via a ring 19, to which an extension tube 20 communicating with the suction side of the vacuum cleaner via a hose is detachably connected. be.

Reference numeral 21 designates an air turbine provided on one side of the turbine chamber 6, and a shaft body 22 extends from the negative side of the air turbine, passing through the hollow shaft 17 of the suction joint 14 and projecting to the outside of the turbine chamber. 23
24 is a bearing of the shaft 22 provided on the floor nozzle body 1, and 24 is a power transmission suspended between a small pulley portion 25 formed at the tip of the shaft 22 and a large pulley 26 provided on the rotating brush 8. This is a belt for. That is, the rotation of the air turbine 21 is transmitted to the rotating brush 8 at a reduced speed.

Reference numerals 27 and 28 designate two vent holes formed in the partition wall 7, one vent 27 facing the air turbine 21 and the other vent 28 not facing the air turbine 21 but directly facing the air turbine 21. It is centrally opposed to the connection port 15 of the suction joint 14. 29 is a shutter that opens and closes the vent 28;
30 is its operator.

The operation of the floor nozzle of this embodiment will now be explained.

When the vacuum cleaner is operated with the vent 28 closed by the shutter 29, dust-laden air flows through the suction chamber → suction chamber 5 → ventilation chamber 27 → turbine chamber e → connection port 15 → connection tube 18 → extension pipe 20 → hose The liquid flows and is sucked into the vacuum cleaner. The air reaching the turbine chamber 6 from the vent 27 acts on the air turbine 21 to rotate it.

The rotation of the air turbine 21 is transmitted to the rotating brush 8 via the belt 24.

Therefore, the dust on the surface to be cleaned, such as a carpet, is scraped up by the brush body 1o of the rotating brush 8 and carried by the suction airflow to the vacuum cleaner.

Next, when the shutter 29 is operated to open the vent 28, air flows through the flow system from the vent 28 to the connection port 15, which has low resistance. That is, the flow takes a form that substantially bypasses the air turbine 21, thereby stopping the rotation of the air turbine 21 and the rotating brush 80.

In the above embodiment, the air turbine 21 is controlled to start and stop, but in some cases, this function may be eliminated and the air turbine 21 may be constantly driven.

In addition, even in the case where the start/stop is controlled, the vents 27 and 28 are combined into one large opening, and one hole is formed in the shutter 29, and as the shutter 29 moves, this hole is used to release air. It is also conceivable to have it face the turbine 21 or not face it.

Now, the air turbine 21 described above has a body 31 having a substantially concave curved surface.
A recirculating flow type (Pelton type) turbine 33 having a cylindrical outer shape and having a large number of turbine blades 32 arranged radially in the
A once-through turbine 36 in which one end of a large number of turbine blades 35 are arranged on one side of the side plate part 34 at equal intervals and in a conical shape.
and are combined in the axial direction. The tips of the turbine blades 35 of the once-through turbine 36 are each open 9, in other words, a cantilevered support configuration is adopted.

Furthermore, the configurations of both turbines 33 and 36 will be explained in detail.

First, one of the recirculating type turbines 33 has a body 31 formed of a body member 37 having integrally formed turbine blades 32 and a side plate portion 34 of a once-through type turbine 36 . The turbine blade pieces 32 are composed of 13 pieces. The side plate portion 34 on the return flow turbine 33 side is tapered to form a continuous substantially concave curved surface together with the body member 37. 38 is a boss portion formed integrally with the body member 37 and has a shaft hole 39, and 4o is a plurality of recesses formed in a portion facing the side plate portion 34. The outer shape of a recirculating turbine is cylindrical.

Further, in the once-through type turbine 36, a shaft hole 4a with a small diameter tip is formed in the center of the side plate part 34.
3 has an annular groove 42 on one side opposite to the groove 4 .
A plurality of convex portions corresponding to 0 are formed respectively. The turbine blades 36 are composed of ten pieces, each having a conical outer shape, and the distance from the partition wall 7 to the outer end of the turbine blades 36 increases as the airflow moves toward the center.

The recirculating turbine 33 and the once-through turbine 36 are press-fitted into the shaft body 22 through their shaft holes 39,41.

Of course, the tip of the shaft body 22 has a step corresponding to the small diameter portion of the shaft hole 41. When press-fitting, both turbines 33.
The 36 concave and convex portions 40 and 43 engage with each other to exert an unifying effect in the rotational direction. Turbine blades 32 and 3
5 are engaged so as not to be in the same position. 44 is a washer for preventing removal.

Further, the outer diameter of the side plate portion 34 is the same as that of both turbine blade pieces 32.
The diameter is smaller than the diameter connecting the outer ends of 35.

Further, the vent hole 27 is set to face the side plate portion 34 so that airflow flows to each turbine 33, 36.

In the above configuration, the operation of the air turbine 21 will be explained below.

First, in the recirculating turbine 33, the airflow from the vent 27 collides with the turbine blade piece 32 as shown in FIG. It takes the form of return flow like this.

Rotational torque is generated in the recirculating turbine 33 due to the collision of the airflow with the turbine blade pieces 32 . As is well known, this torque is large at low speeds, and decreases as the rotation speed increases because the relative collision force becomes weaker.

Furthermore, in the once-through type turbine 36, the airflow from the vent 27 acts on the turbine blade piece 36 twice when it crosses it, so that the airflow forms a once-through flow as shown by the arrows.

In the once-through type turbine 36, the airflow flows through the turbine in the direction of the arrow, and the so-called airflow passage characteristics are good, so as the rotational speed increases to a certain value, the rotational torque also increases. There are 13 turbine blades 32 and 10 blades 36, and they are set at different positions, so the air flowing in through the vent 27 collides with the turbine blades 32, and the turbine blades 36
6, and then collides and flows out to the turbine blade piece 36. Because the torque is dispersed over time and collides with each turbine blade piece 32, 35, the generated torque is also dispersed, averaged, and stabilized. become

Therefore, in the air turbine 21 in this embodiment, a rotational torque of a certain value or more can be obtained from the time of startup. Therefore, even if the distance A between the vent 27 and the air turbine 21 is made large, good rotational torque can be obtained.

Furthermore, as described above, the airflow flowing in from the vent 27 collides with the turbine blades 32 and 35 in a time-distributed manner, and since the distance is greater than the vent 27, the air is cut by the turbine blade. This reduces the noise generated.

Further, when large dirt is sucked in through the vent 27, this large dirt cannot flow through between the wing pieces 35 and moves in the direction shown by arrow C. Since the distance between the outer end of the blade 36 and the partition wall 7 increases in the direction in which the airflow advances, large particles flow smoothly with the airflow, improving dust suction performance.

According to experiments, when the outer diameter B of the air turbine 21 was set to φ36 mist and the distance A between the vent 27 and the air turbine was changed, the characteristics were measured as shown in FIG. 7.

If we take the ratio of A and B on the horizontal axis and the high-frequency sound of a sharp sound on the vertical axis, then A/B=o, 1, that is, B=36 A=3.6
If the trmO sound is taken as the reference odB, then the sound will be louder if the distance A is made smaller than it, and the sound will be quieter if it is made larger. Even if I set A/B to 0.26 or higher, it did not become much smaller. Regarding the rotational torque, the smaller A is, the higher the torque is, and the larger A is, the lower the torque, but there was no problem in actual use until A/B was 0.25. When looking at both sound and performance, a value of about 0.2 to 0.26 was the best.

In this embodiment, the number of turbine blade pieces 32 is 13, but
About 11, 13, and 15 blades are good in terms of torque stability and moldability when molded with resin, and the turbine blades 35 have 8 blades.
About 9 or 10 pieces is good.

(When the number of turbine blades 32 is 16, it is better not to select 9 or 10 of the turbine blades 36 because they have the greatest common divisor.) In addition, the turbine blades 35 allow air to flow through them, Since torque is generated in both the flow and the outflow, it is better to set it smaller than the turbine blade 32.

Effects of the Invention As described above, the present invention configures an air turbine with a substantially cylindrical double-flow turbine and a substantially conical once-through turbine, and increases the distance between the vent and the air turbine (A/B >0
．． 2) By doing so, the start-up characteristics at startup are significantly improved, and the torque during steady rotation can also be maintained at a high level, and the dust suction performance for large particles can be improved with low noise.

Therefore, cleaning can be started quickly and reliably, and its usability can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway top view of a floor nozzle showing an embodiment of the present invention with the upper main body member removed; Fig. 2 is a perspective view; Fig. 3 is a sectional view of the air turbine; The figure is an exploded cross-sectional view.
FIG. 5 is a perspective view of a recirculating type turbine, FIG. 6 is a perspective view of a once-through type turbine, and FIG. 7 is a noise characteristic diagram. 8...Rotating brush, 21...Air turbine, 27...Vent, 32.35...
... Turbine blade piece, 33 ... Double-flow turbine,
36... Once-through turbine O Name of agent Patent attorney Toshio Nakao and 1 other person No. 2
Figure 4 Figure 6 Figure 7 0 0/ 0.2 03A7゜

Claims (1)

[Claims] The air turbine includes an air turbine rotated by air drawn into the vacuum cleaner, and a rotating brush linked to the air turbine, and the air turbine includes a substantially cylindrical double-flow turbine and a substantially conical once-through turbine. In addition, the number of turbine blades of each turbine is set to different values that do not have the greatest common divisor, and the positions of these turbine blades are shifted from each other. A floor nozzle for a vacuum cleaner in which a vent is provided opposite the joining part of the return flow type and once-through type, and the distance between the vent and the air turbine is set to 0.2 or more of the maximum outer diameter of the air turbine. .