JPH0552210B2 - - 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 Incidentally, in a once-through type turbine, the working airflow hits the turbine blade pieces on each of the inflow side and the outflow side, so a high rotational speed can be obtained, and accordingly, a high rotational speed can be obtained in the same rotational region. The torque is also high. However, the once-through type turbine has poor start-up characteristics because the airflow passes through it. 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.

To prevent this, reducing the distance between the vent facing the turbine and the turbine improves torque, but there is a problem in that the space between the vent and the turbine is clogged with sucked-in dust.

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 that communicates with the suction side of the vacuum cleaner, and a rotating brush connected to the air turbine, the air turbine having a plurality of tapered points on one side of the side plate portion. The turbine 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 to form a conical flow-through type turbine, and a large number of turbine blades are arranged radially around the outer circumference of the body. and a recirculating type turbine in which air flows back through the compartment space between adjacent turbine blades on the outer periphery of the shell, in combination with a once-through type turbine such that the open side of the turbine blades is located in the direction of the connection port. In addition, the air turbine is arranged with play in the thrust direction.

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, since the once-through turbine is conical and the air turbine itself has some play in the thrust direction, if large debris hits the tapered part of the once-through turbine, the force in the thrust direction will be increased. The air turbine escapes by the amount of play in the thrust direction. As a result, the passage becomes larger, allowing large particles to be sucked in smoothly without clogging, and improving dust suction performance.

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 protruding 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 which is attached to the inner surface of the turbine chamber 6 so as to be freely rotatable in the upward 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 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 denotes an air turbine provided on one side of the turbine chamber 6, and from that side there is a shaft body 2 that penetrates the hollow shaft 17 of the suction joint 14 and projects to the outside of the turbine chamber.
2 is out. 23 is a bearing of the shaft 22 provided on the floor nozzle main body 1, and 24 is a power transmission device stretched 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. It is 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, but directly facing the air turbine 21. suction joint 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 from the suction port→
Suction chamber 5 → Vent port 27 → Turbine chamber 6 → Connection port 1
5→connection pipe 18→extension pipe 20→hose and flow,
This is what is sucked into the vacuum cleaner. The air reaching the turbine chamber 6 from the air 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, 17 holes are formed in the shutter 29, and as the shutter 29 moves, these holes are made to face or not face the air turbine 21. is also possible.

Now, the above air turbine 21 includes a recirculating flow type (Pelton type) turbine 33 having a cylindrical outer shape in which a large number of turbine blade pieces 32 are arranged radially on a body 31 having a substantially concave curved surface, and one side of a side plate part 34. Each end of a large number of turbine blades 35 is combined in the axial direction with once-through turbines 36 arranged conically at equal intervals. The tips of the turbine blades 35 of the once-through type turbine 36 are each open, in other words, a cantilevered support 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 the side plate portion 34 of the once-through 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 formed integrally with the body member 37 and has a shaft hole 39, and 40 is a plurality of recesses formed in a portion facing the side plate portion 34. The recirculating turbine has a cylindrical outer shape and is set parallel to the partition wall 7.

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. The once-through turbine has an approximately conical outer shape, and the distance from the partition wall 7 to the outer end of the turbine blade 35 increases as the airflow moves toward the center.

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. When press-fitting, the uneven parts 40, 4 of both turbines 33, 36
3 are engaged to exert an unifying action 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 shaft body 22 of the air turbine 21 is provided with play in the thrust direction, and is set so that the side plate portion 34 comes to approximately the center of the vent 27 when approaching the center of the suction passage. It is set so that the airflow flows.

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

First, the air turbine 2
1 is pulled toward the center of the suction passage, and the shaft body 22 moves toward the center due to the backlash in the thrust direction. Then, as shown by the solid line in Figure 3, the vent 2
The side plate portion 34 of the air turbine 21 is located approximately in the center of the air turbine 7.
is located.

In the recirculating turbine 33, the airflow from the vent 27 collides with the turbine blades 32, and
It flows to the opposite side along the substantially concave curved surface of the body 31, and as shown by the arrow a.
It takes the form of return flow like this. The turbine blade piece 32
Rotational torque is generated in the recirculating turbine 33 due to the collision of the airflow with the airflow. As is well known, this torque increases at low speeds, and decreases as the rotation speed increases because the relative collision force becomes weaker.

In addition, in the once-through type turbine 36, the vent 27
The airflow from the turbine blade 35 acts twice on the turbine blade 35 when it crosses it, and takes on a through-flow form as shown by the arrow b. In the once-through type turbine 36, as air flows through the turbine 36 and its rotational speed increases to a certain value, its 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.

Further, when large dirt is sucked in through the vent 27, the large dirt cannot flow between the wing pieces 35 and moves in the direction shown by arrow c. Since the turbine blade piece 35 is conical and the distance from the partition wall 7 increases in the direction in which the air flow advances,
Large debris flows smoothly due to air currents. In addition, even if a large piece of dust gets caught between the air turbine 36 and the floor nozzle, the air turbine 21 will escape in the thrust direction as shown by the broken line in Figure 3, and the dust will flow through without clogging, resulting in improved dust suction performance. will be greatly improved.

Effects of the Invention As described above, in the present invention, by configuring an air turbine by combining a substantially conical double-flow turbine and a substantially cylindrical once-through turbine, the start-up characteristics at startup are significantly improved, and the steady-state It is possible to maintain high torque during rotation, and by providing the air turbine with play in the thrust direction, it is also possible to improve the dust absorption characteristics of large particles.

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

[Brief explanation of drawings]

Fig. 1 is a top view of a floor nozzle showing an embodiment of the present invention with the upper main body member removed;
The figure is a perspective view, and Figure 3 is a cross-sectional view of the air turbine.
FIG. 4 is an exploded sectional view, FIG. 5 is a perspective view of a recirculating turbine, and FIG. 6 is a perspective view of a once-through turbine. 8... Rotating brush, 21... Air turbine,
33... Double-flow turbine, 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 plurality of tapered turbine blades arranged in a circular manner on one side of the side plate portion, through which air flows in the radial direction, and a rotary brush connected to the air turbine. A conical once-through turbine with open tips and a large number of turbine blades arranged radially around the outer circumference of the shell, with air flowing back through the 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 reciprocating flow turbine with a once-through flow turbine such that the open side of the turbine blade of the once-through turbine is positioned in the direction of the connection port, and the air turbine is arranged with play in the thrust direction. .