JPH0552208B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 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, for this type of floor nozzle for vacuum cleaners,
The air turbine that serves as the drive source for the rotating brushes is a so-called once-through turbine, in which a large number of turbine blades each having an arcuate cross section are arranged at regular intervals in a circular shape on a disc-shaped side plate. The rotational force of the air turbine driven by the suction airflow to 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 By the way, in a once-through type turbine, the working airflow hits the turbine blades on each of the inflow side and the outflow side, so a high rotational speed can be obtained, and accordingly, the rotational speed in the same rotational region is low. Torque is also high. However, since the airflow flows through the above-mentioned once-through type turbine, the start-up characteristics are poor. 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 may not rotate properly. There was a problem that it took a long time to reach the rotation area.

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

Means for Solving the Problems In order to solve these conventional problems, the present invention provides an air turbine that is rotated by the air sucked into the vacuum cleaner, and an air turbine that is internally installed on one side. , a turbine chamber having a connection port formed on the other side communicating with the suction side of the vacuum cleaner, and a rotating brush linked to the air turbine, the air turbine having a plurality of turbines on one side of the side plate portion. There are once-through type turbines in which the blades are arranged in a circular pattern so that air flows through them in the radial direction, and the tip of each turbine blade is open. A recirculating type turbine in which air flows back through a partitioned space between adjacent turbine blades on the outer periphery is combined with a once-through type turbine such that the open side of the turbine blades of the once-through type turbine is located in the direction of the connection port, and the above-mentioned The side plate portion of the once-through type turbine is formed to partition the side plate from the backflow type turbine side, and has a tapered surface facing the backflow type turbine side.

Function In a recirculating type turbine, the airflow that collides with the blade pieces does not escape in the radial direction like in a once-through type turbine, so the torque at startup is very high.
As the rotation speed increases, the torque decreases. 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 start-up characteristics can be supplemented by the recirculating type turbine, and the characteristics during steady rotation can be ensured by the once-through type turbine.

Furthermore, the side plate portions ensure air flow to both turbines without interfering with each other, thereby maximizing the performance of each turbine.

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

1 to 6, a floor nozzle main body 1 is constructed by connecting upper and lower main body members 3 and 4 via a bumper 2, and has a suction chamber with a lower open part as a suction port in the front interior thereof. 5, and a turbine chamber 6 is formed in the rear interior. The turbine chamber 6
is separated from the suction chamber 5 by a partition wall 7, and has a generally cylindrical shape as a whole. 8 is suction chamber 5
Rotating brushes 11 are provided on both side walls of the suction chamber 5, with a part of the brush body 10 embedded in the rotor 9 projecting to the outside through the suction port. , a bearing supporting a shaft 12 protruding from the rotating brush 8 to both sides; 13 is a wheel provided at the front and back of the bottom of the floor nozzle body 1 in order to position the suction port of the suction chamber 5 at a constant distance from the surface to be cleaned; .

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 its peripheral wall.
In the suction joint 14, a shaft 16 and a hollow shaft 17, which project outward from the side wall thereof, are supported by the walls of both sides of the turbine chamber 6. Reference numeral 18 indicates 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 eliminator via a hose is detachably connected. It is.

Reference numeral 21 denotes an air turbine provided on one side of the turbine chamber 6, from which a shaft body 22 extends through the hollow shaft 17 of the suction joint 14 and projects to the outside of the turbine chamber. 23 is a bearing of the shaft 22 provided on the floor nozzle body 1, and 24 is a power transmission bearing stretched between a small pulley 25 formed at the tip of the shaft 22 and a large pulley 26 provided on the rotating brush 8. It's a belt. That is, the rotation of the air turbine 21 is transmitted to the rotating brush 8 at a reduced speed.

27 and 28 are 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 and directly facing the air turbine 21. Suction fitting 1
It faces the connection port 15 of No. 4. 29
is a shutter that opens and closes the vent 28, and 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, the dust-containing air flows through the suction port → suction chamber 5 → vent 27 → turbine chamber 6 → connection port 15 → connection tube 18 → extension pipe 20 → It flows through the hose 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, dust on the surface to be cleaned, such as a carpet, is scraped up by the brush body 10 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 a 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 8.

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 driven at all times.

Also, even if the vent 2 is used for on/off control,
7 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 made to face or not face the air turbine 21. is also possible.

Now, the above-mentioned air turbine 21 includes a recurrent (Pelton type) turbine 33 in which a large number of turbine blades 32 are arranged radially on a body 31 having a substantially concave curved surface, and a large number of turbine blades 32 on one side of a side plate portion 34 that is a side plate. Each end of each turbine blade piece 35 is combined in the axial direction with a once-through type turbine 36 arranged at equal intervals and in a circular shape. Turbine blade 3 of once-through turbine 36
The tips of 5 are open, in other words, a cantilevered structure is adopted.

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

First, one of the recirculating turbines 33 has its shell 3
1 is a body member 37 in which a turbine blade piece 32 is integrally formed.
and a side plate portion 34 which also serves as a side plate of the once-through type turbine 36. 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 integrally formed with the body member 37 and has a shaft hole 39; 40 is a side plate portion 3;
These are a plurality of recessed portions formed in the portion facing 4.

Furthermore, in the once-through type turbine 36, a shaft hole 41 with a small diameter tip is provided at the center of the side plate portion 34, and an annular groove 42 is formed on one side facing the recirculation type turbine 33, which corresponds to the recessed portion 40. Multiple convex parts 4
3 are formed respectively.

These recirculating flow type turbine 33 and once-through type turbine 3
6 is press-fitted into the shaft body 22 through its shaft holes 39 and 41. Of course, the tip of the shaft body 22 has a step corresponding to the small diameter portion of the shaft hole 41. Also, at this time, the uneven portions 40 of both turbines 33 and 36,
43 are engaged to exert an unifying effect in the rotational direction. 44 is a washer for preventing it from coming off.

Furthermore, the outer diameter of the side plate portion 34 is smaller than the diameter connecting the outer ends of both turbine blade pieces 32, 35.

The vent hole 27 faces the side plate portion 34 and is set so that airflow flows to each of the turbines 33 and 36.

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

First, in the recirculating turbine 33, the vent 2
As shown in Figure 3, the airflow from 7 passes through the turbine blade 3.
2 and flows toward the opposite side along the substantially concave curved surface of the shell 31, forming a return flow as shown by arrow a. 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, the torque is greater at low speeds,
The higher the rotational speed, the weaker the relative collision force becomes, so it becomes smaller.

In addition, in the once-through type turbine 36, the vent 27
When the airflow crosses it, it acts twice on the turbine blade 35 and takes on a flow-through form as shown by arrow b.

In the once-through type turbine 36, the airflow flows through as shown by the arrow b, and the so-called airflow passage characteristics are good.
In the process of increasing the rotational speed to a certain value, the rotational torque also increases.

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.

By the way, in the configuration of the air turbine 21, in particular, the double-flow turbine 33 has a body 3 having a substantially concave curved surface.
1, but it is divided into a body member 37 and a partition wall portion 34 which also serves as a side plate of a once-through turbine 36. Therefore, each turbine 3
Nos. 3 and 36 can be easily molded from synthetic resin using a two-piece mold, making them highly suitable for mass production.

Further, the groove 42 formed in the side plate portion 34 can be used for balancing the air turbine 21.

That is, by inserting a balance weight into the groove 42, it is possible to balance the once-through type turbine 36 and the double-flow type turbine 33 at the same time, or in other words, balance the entire combined air turbine 21. Furthermore, the groove 42 prevents sink marks from forming on the thick side plate portion 34.

This sink prevention has a positive impact on turbine performance.

That is, if the concave groove 42 were not present, a sink mark would occur on a part of the substantially concave curved surface of the body 31 or on the surface on the turbine blade 35 side.

The sink mark generates a factor that disturbs the airflow, such as a vortex, and reduces the force acting on the air turbine 21.

However, according to this embodiment, the balancing groove 42 prevents the occurrence of sink marks, and the air turbine 21
This improves the effect of airflow on the air.

Furthermore, the partition wall portion 34 generates the return flow form a and the through flow form b independently without interfering with each other,
It goes without saying that this is useful in maximizing the capabilities of the individual turbines 33, 36.

Effects of the Invention As described above, the present invention has an air turbine constructed by combining a recirculation type turbine and a once-through type turbine, thereby significantly improving the start-up characteristics at startup and maintaining high torque during steady rotation. It is.

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

In addition, since both turbines are separated by a side plate, the airflow can act on each turbine independently without interfering with each other, and the side plate has a tapered surface that faces the recirculating turbine. The tapered shape of the turbine smoothes the flow of air to the recirculating turbine, thereby further improving the performance of these turbines.

[Brief explanation of the drawing]

Fig. 1 is a partially cut-out top view of a floor nozzle showing an embodiment of the present invention with the upper body member removed, Fig. 2 is a perspective view, Fig. 3 is a sectional view of the air turbine, and Fig. 4. 5 is an exploded sectional view, FIG. 5 is a perspective view of a double-flow turbine, and FIG. 6 is a perspective view of a once-through turbine. 8... Rotating brush, 21... Air turbine,
33... Double flow turbine, 34... Side plate part, 36
...Once-through turbine.

Claims (1)

[Claims] 1. An air turbine rotated by air drawn into a vacuum cleaner, and a turbine chamber in which the air turbine is installed on one side and a connection port communicating with the suction side of the vacuum cleaner is formed on the other side. and a rotating brush linked to the air turbine, the air turbine having a large number of turbine blades arranged in a circle on one side of the side plate portion, through which air flows in the radial direction, and a rotating brush of each turbine blade. There are once-through type turbines with open tips, and return-flow type turbines in which a large number of turbine blades are arranged radially around the outer circumference of the shell, and air flows back through the space between adjacent turbine blades on the outer periphery of the shell. and a once-through type turbine in such a manner that the open side of the turbine blades is located in the direction of the connection port, and a side plate portion of the once-through type turbine is formed so as to partition it from the backflow type turbine side. , a floor nozzle for a vacuum cleaner in which the surface facing the recirculating turbine side is tapered.