JPH078272B2 - Floor nozzle for vacuum cleaner - Google Patents

Description

BACKGROUND OF THE INVENTION 1. 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.

2. Description of the Related Art Conventionally, in this type of vacuum cleaner floor nozzle, an air turbine that is a drive source of a rotating brush has a circular disk-shaped side plate with a large number of turbine blade pieces having an arc-shaped cross section at equal intervals. The so-called once-through type turbine arranged in the above was adopted.
Then, the rotational force of the air turbine driven by the suction airflow to the vacuum cleaner is transmitted to the rotary brush via an intermediate transmission means such as a belt.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the once-through type turbine, since the working airflow hits the turbine blades on both the inflow side and the outflow side, a high rotational speed can be obtained, and accordingly, in the same rotational range. The torque is also high. However, since the above-mentioned once-through type turbine has a poor rising characteristic from the place where the airflow flows through, for example, when starting with the floor nozzle in contact with the surface to be cleaned such as a carpet, the turbine does not rotate or has a predetermined rotation range. There was a problem that it took time to reach.

The present invention solves the above-mentioned conventional problems, and provides a floor nozzle for a vacuum cleaner which is easy to use and has excellent dust absorption performance.

Means for Solving the Problems In order to achieve the above object, the present invention provides an air turbine rotated by suction air to a vacuum cleaner, and an air turbine installed in one side of the air turbine for suction of the vacuum cleaner. A turbine chamber having a connection port formed on the other side and a rotating brush linked to the air turbine, wherein the air turbine has a large number of turbine blades arranged in a circle on one side of the side plate portion. As a result, air flows through the turbine in the radial direction, and a once-through type turbine in which the tips of the turbine blades are open, and a large number of turbine blades are radially arranged on the outer circumference of the cylinder. It is configured by combining a return-flow turbine in which air returns to the partitioned space between the pieces so that the open side of the turbine blade piece of the once-through turbine is positioned in the direction of the connection port.

In the return-flow turbine, the airflow that collides with the blades does not escape in the radial direction like a once-through turbine, so the torque at the start-up is very high, but the torque decreases as the rotational speed increases. come. On the other hand, the once-through type turbine has the opposite characteristics as described above.

Therefore, when these two turbines are combined into one air turbine, the rising characteristics can be complemented by the return-flow turbine, and the characteristics during steady rotation can be secured by the once-through turbine.

Example An example will be described below with reference to the accompanying drawings.

1 to 6, a floor nozzle body 1 is a bumper 2
The upper and lower body members 3 and 4 are connected to each other through a suction chamber 5 having a lower opening as a suction port and a turbine chamber 6 formed in the rear. is there. The turbine chamber 6 is partitioned by the partition wall 7 into the suction chamber 5, and is set in a substantially cylindrical shape as a whole. Reference numeral 8 is a rotary brush provided in the suction chamber 5 in parallel therewith, so that a part of the brush body 10 planted in the rotor 9 is projected to the outside through the suction port, and 11 is both side chambers of the suction chamber 5. Installed on the wall,
A bearing for supporting the shaft 12 protruding from the rotating brush 8 to both sides,
Reference numeral 13 is a wheel provided at the front and rear of the bottom portion of the floor nozzle body 1 so that the suction port of the suction chamber 5 is located at a constant distance from the surface to be cleaned.

Reference numeral 14 is a suction joint of a substantially semi-cylindrical shape which is attached to the inner surface of the turbine chamber 6 so as to be rotatable in the elevation direction, and a cylindrical connection port 15 is formed in a part of its peripheral wall. The suction joint 14 has a shaft 16 and a hollow shaft 17 projecting outward from the side wall of the suction joint 14 and the turbine chamber 6
Is axially supported by the walls of both chambers. 18 is a ring at connection port 15
The connection tube is rotatably attached via 19 and an extension tube 20 communicating with a suction side of the vacuum cleaner via a hose is detachably connected.

Reference numeral 21 denotes an air turbine provided on one side in the turbine chamber 6, and a shaft body 22 penetrating the hollow shaft 17 of the suction joint 14 and protruding to the outside of the turbine chamber is projected from the one side. Reference numeral 23 denotes a bearing of the shaft body 22 provided on the floor nozzle body 1, and 24 denotes power transmission stretched between a small pulley portion 25 formed at the tip of the shaft body 22 and a large pulley 26 provided on the rotary brush 8. The belt. That is, the rotation of the air turbine 21 is decelerated and transmitted to the rotating brush 8.

27 and 28 are two vents formed in the partition wall 7, one vent 27 is facing the air turbine 21, and the other vent 28 is not facing the air turbine 21, Is opposed to the connection port 15 of the suction joint 14. Reference numeral 29 is a shutter for opening and closing the vent hole 28, and 30 is an operator thereof.

Now, the temporary operation of the floor nozzle of this embodiment will be described.

When the vacuum cleaner is operated with the shutter 29 closing the ventilation hole 28, the dust-containing air is sucked in → the suction chamber 5 → the ventilation hole 27.
→ Turbine chamber 6 → Connection port 15 → Connection tube 18 → Extension pipe 20 → Hose and flow to the vacuum cleaner.
Then, the air from the vent 27 to the turbine chamber 6 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 such as carpets on the surface to be cleaned is scraped up by the brush body 10 of the rotary brush 8 and carried by the suction airflow to reach the vacuum cleaner.

Next, when the shutter 29 is operated to open the ventilation port 28, the air flows through the fluid yarn from the ventilation port 28 having a low resistance to the connection port 15. That is, the air turbine 21 has a flow form that substantially bypasses the air turbine 21.
The rotation of the rotary brush 8 is stopped.

In the above embodiment, the start / stop control of the air turbine 21 is performed, but in some cases it may be possible to eliminate the function and always drive the air turbine 21.

In addition, even if the start / stop control is performed, the vent holes 27, 28 are combined into one large opening, and one hole is formed in the shutter 29, and this hole is aired as the shutter 29 moves. It is also conceivable to face the turbine 21 or not face it.

By the way, the air turbine 21 includes a reflow type (Pelton type) turbine 33 in which a large number of turbine blade pieces 32 are radially arranged on a body 31 having a substantially concave curved surface, and a large number of turbine blade pieces on one side of a side plate portion 34. Each one end of 35 is equidistantly arranged and is combined with a once-through type turbine 36 arranged in a circle in the axial direction. The tips of the turbine blades 35 of the once-through turbine 36 are open, in other words, cantilevered.

Further, the configurations of both turbines 33 and 36 will be described in detail.

First, in one of the reflow type turbines 33, the body 31 is formed by a body member 37 integrally formed with turbine blades 32 and a side plate portion 34 of a once-through type turbine 36. The side plate portion 34 has a taper shape on the side of the backward flow turbine 33 so as to form a continuous substantially uneven curved surface together with the body member 37. Reference numeral 38 denotes a boss portion integrally formed with the body member 37 and having a shaft hole 39, and reference numeral 40 denotes a plurality of recesses formed in a portion facing the side plate portion 34.

Further, in the once-through type turbine 36, a shaft hole 41 having a small tip at the center of the side plate portion 34 corresponds to the annular concave groove 42 on one side surface facing the backward flow turbine 33, and the concave portion 40. A plurality of convex portions 43 are formed respectively.

These return-flow turbine 33 and once-through turbine 36 have their axial holes.
It is press-fitted and attached to the shaft body 22 via 39 and 41. Of course, the tip end of the shaft body 22 has a step corresponding to the small diameter portion of the shaft hole 41. At this time, the concave and convex portions 40 and 43 of the turbines 33 and 36 are engaged with each other to exert an integrated action in the rotational direction. 44 is a washer for retaining.

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

Then, the vent hole 27 is opposed to the side plate portion 34, and
The air flow is set to flow in 33 and 36.

The operation of the air turbine 21 in the above configuration will be described below.

First, in the return-flow turbine 33, the air flow from the vent 27 collides with the turbine blade 32 as shown in FIG. 3, and flows to the opposite side along the substantially concave curved surface of the body 31, and the arrow a It takes the form of a return flow. Due to the collision of the air flow with the turbine blade 32, a rotational torque is generated in the return-flow turbine 33.
As is well known, the torque becomes larger at low speeds, and becomes smaller as the rotation speed becomes higher, because the relative collision force becomes weaker.

Further, in the once-through turbine 36, the air flow from the vent 27 acts twice on the turbine blade 35 when crossing it, and the air flow from the vent 27 is indicated by the arrow b.
It has a flow-through form as shown in.

In the once-through turbine 36, the air flow passes through as shown by the arrow b,
Since the so-called air flow passage characteristic is good, the rotational torque also increases as the number of rotations increases to a certain value.

Therefore, in the air turbine 21 of this embodiment, a rotational torque of a certain value or more can be obtained from the time of starting.

By the way, in the configuration of the air turbine 21, in particular, although the convection turbine 33 has a substantially concavely curved barrel 31, it is divided into a barrel member 37 and a side plate portion 34 of the once-through turbine 36. . Therefore, each turbine 33, 36 has 2
Since it can be easily molded with synthetic resin using a split mold, it has excellent mass productivity.

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

That is, if a balance weight is inserted in the concave groove 42, it is possible to balance the once-through type turbine 36 and the return-flow type turbine 33 at the same time, in other words, the balance of the composite type air turbine 21. Moreover, the concave groove 42 prevents sink marks from being generated in the thick side plate portion 34.

This sink protection has a positive effect on turbine performance.
That is, if the concave groove 42 is not provided, a sink mark is generated on a part of the substantially concave curved surface of the body 31 or the surface on the turbine blade 35 side.

The sink marks generate factors that disturb the flow of the air flow, such as vortices,
The action force on the air turbine 21 is reduced.

However, according to this embodiment, the concave groove 42 for balancing prevents the occurrence of sink marks and improves the action of the air flow on the air turbine 21.

Further, by making the outer diameter of the side plate portion 34 smaller than that of both turbine blades 32, 35, the flow of airflow to the turbine blades 32, 35 can be made more useful.

That is, when the outer diameter of the side plate portion 34 is larger than that of the turbine blade pieces 32, 35, the airflow is branched at the outer peripheral end of the side plate portion 34 and flows so as to spread to both sides to reach the turbine blade pieces 32, 35.
This means that the normal backflow mode a and the normal crossflow mode b are deviated, and the influence on the turbines 33 and 36 is reduced.

However, if the outer diameter of the side plate portion 34 is made small as in the present embodiment, the return flow mode a and the through flow mode b will not be disturbed, and the airflow will effectively act on the air turbine 21.

Of course, it goes without saying that the side plate portion 34 is effective in maximizing the capabilities of the individual turbines 33 and 36 by independently generating the return flow pattern a and the through flow pattern b without interfering with each other.

EFFECTS OF THE INVENTION As described above, according to the present invention, by constructing an air turbine by combining a return-flow turbine and a once-through turbine, it is possible to remarkably improve the start-up characteristic at the time of starting and to maintain a high torque during steady rotation. Is.

Therefore, cleaning can be started promptly and surely, and the usability thereof can be greatly enhanced.

[Brief description of drawings]

1 is a partially cutaway top view of a floor nozzle with an upper body member removed according to an embodiment of the present invention, FIG. 2 is a perspective view, FIG. 3 is a sectional view of an air turbine, and FIG. The figure is an exploded sectional view,
FIG. 5 is a perspective view of a return-flow turbine, and FIG. 6 is a perspective view of a once-through turbine. 8 …… Rotating brush, 21 …… Air turbine, 33 …… Backflow turbine, 36 …… Flow-through turbine.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Sadahiro Shimada 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) Reference JP-A-61-263427 (JP, A)

Claims (1)

[Claims] Claim: What is claimed is: 1. An air turbine rotated by suction air to a vacuum cleaner, and a turbine having the air turbine internally provided on one side and a connection port communicating with the suction side of the vacuum cleaner formed on the other side. The air turbine includes a chamber and a rotating brush linked to the air turbine. The air turbine has a large number of turbine blades arranged in a circle on one side of a side plate to allow air to flow through in a radial direction. A through-flow type turbine with the tip of the piece open, and a large number of turbine blades arranged radially on the outer circumference of the shell, and a return-flow type in which air returns to the partitioned space between adjacent turbine blades on the outer circumference of the shell. A floor nozzle for a vacuum cleaner, which is configured by combining a turbine and a turbine blade opening side of a once-through turbine so as to be positioned in the direction of the connection port.