JPS60129026A - Floor nozzle of electric 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 vacuum cleaner floor nozzle with rotating brushes.

Structure of a conventional example and its problems Figure 1 shows a conventional example of this type of vacuum cleaner floor nozzle.A rotating brush 2 is installed in the floor nozzle body 1 connected to the suction side of the vacuum cleaner. A suction chamber 3 is provided, and a turbine chamber 5 is formed with an air turbine 4 installed therein.
Moreover, these two chambers 3.degree. 5 communicate with each other through a vent hole 6.

When you run a vacuum cleaner, its suction power moves from suction chamber 3 to ventilation chamber 6.
→ Air is drawn into the turbine chamber 6, and the air turbine 4 rotates. This rotation is then transmitted to the rotating brush 2 via a power transmission means such as a belt.

By the way, in the case of such a floor nozzle, the rotational force of the rotating brush 2 is caused by the suction of the air that flows into the air turbine.When the amount of air flowing in decreases, the flow velocity of the air hitting the air turbine 4 decreases, and the output of the rotating brush 2 decreases. decreases. Conversely, when the amount of inflow increases, the output of the rotating brush 2 increases.

In this way, the output of the rotating brush 2 changes depending on the amount of inflow of suction air, but this means that the dust collection performance of the floor nozzle 1 tends to change depending on the amount of suction air.
If the surface to be cleaned is easily attracted to suction, the amount of suction air will be reduced due to suction, and the performance will be degraded.If the surface to be cleaned is less adsorbed, the amount of suction air will increase and the output will increase.
This caused the durability of the bearing portion of the rotating brush 2 to deteriorate.

Purpose of the Invention The present invention eliminates these conventional drawbacks, and provides a floor nozzle for a vacuum cleaner that reduces fluctuations in the output of the rotating brushes, improves the durability of bearings, etc., and has stable dust collection performance. It provides:

Structure of the Invention In the floor nozzle of the vacuum cleaner of the present invention, the opening area of the vent between the suction chamber containing the rotating brush and the turbine chamber containing the air turbine is variable in accordance with the amount of suction air, thereby stabilizing the flow velocity. In addition, when the amount of suction air is large, an opening is provided in the air turbine to allow airflow to flow in the opposite direction to the rotating direction, thereby stabilizing the output of the rotating brush and preventing abnormal increases in rotation speed. This provides dust collection performance and improves the durability of the rotating part.

Description of examples An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 2 and 3, reference numeral 7 denotes a floor nozzle body, in front of which a suction chamber 12- containing a rotating brush 11 is formed, and behind it a turbine chamber 14 containing an air turbine 13. Reference numeral 15 denotes a substantially semi-cylindrical connection case forming the rear portion of the turbine chamber 14, to which the floor nozzle main body 7 is connected so as to be able to rise and fall. 16 is connection case 1
A connection pipe rotatably connected to the opening of 5 is connected to the suction side of the vacuum cleaner. 17 is a vent provided in a partition wall 18 between the suction chamber 12 and the turbine chamber 14.

At the upper end of the vent 17, there is a wind pressure plate 2O whose upper part is rotatably supported by a fulcrum shaft 19.
It is formed so as to block the upper part of 7. 21 is an opening provided above the fulcrum shaft 19 at the upper end of the vent 17;
The opening 21 is formed to be connected to a communication port 22 with the outside. A shielding plate 23 is formed integrally with the wind pressure plate 20 in this opening 21, and when the wind pressure plate 20 blocks the ventilation port 17 to the maximum, the opening 21 is closed and the ventilation port 17 is opened to the maximum. The opening 21 is formed so as to be fully open at the time. In addition, the opening 21 faces the upper part of the air turbine 13. In the above configuration, when the vacuum cleaner is operated, the suction air flows from the suction chamber 12 to the vent 1/7'' turn chamber 14, The air turbine 13 in the turbine 14 is rotated.The rotation is transmitted to the rotating brush 11 by the belt 24, and the rotation of the rotating brush 11 scrapes up dust from the surface to be cleaned, such as a carpet, and collects the dust.

By the way, a wind pressure plate 2o is attached to the vent 17, and as shown in FIG. 4, when the volume of suction air a decreases due to factors such as adsorption, the wind pressure plate 2o Due to the bias, the opening area of the vent 17 is reduced, and since the opening 21 is closed by the shielding plate 23, the suction air a is squeezed by the vent 17, increasing the flow velocity, and thereby the air turbine 13 The number of rotations is not affected by a decrease in the amount of suction air d and does not decrease.

Further, as shown in FIG. 6, when the amount of suction air 6 increases due to reasons such as lifting the floor nozzle body 7 into the air, the opening area of the vent 17 increases and the opening 21 is also opened. As a result, the flow rate of the suction air is reduced, and the bypassed suction air C is introduced from the outside through the opening 21 and the communication port 22. Although the flow rate of the suction air from the vent 17 is large, the flow velocity is not so fast, so the increase in the rotational speed of the air turbine is suppressed, and the suction air C introduced from the opening 21 hits the upper part of the air turbine 13, and further Suppress rotation. Due to these actions, the rotational speed of the air turbine 13 is maintained at a constant rotational speed regardless of the amount of air sucked into it.

Effects of the Invention As described above, according to the present invention, the air turbine always maintains a nearly constant rotation speed regardless of changes in the amount of suction air, and in particular prevents abnormal single rotation and low rotation, resulting in stable dust collection performance and rotation. This can improve the durability of parts, etc.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a floor nozzle of a conventional vacuum cleaner, Fig. 2 is a sectional view of a floor nozzle of a vacuum cleaner according to an embodiment of the present invention, and Fig. 3 is a perspective view of the vent portion of the floor nozzle. Figure 4 is a cross-sectional view of the vent part of the same-floor nozzle when the amount of suction air decreases,
FIG. 5 is a sectional view of the vent portion of the same-floor nozzle when the amount of suction air increases. 11... Rotating brush, 12... Suction chamber, 13... Air turbine, 14...
Turbine room, 17...Vent, 2o...
- Wind pressure plate, 21... Opening, 22... Communication port, 23... Shielding plate. Name of agent: Patent attorney Toshio Nakao and one other name
1 Figure 3 View

Claims (1)

[Claims] (1) A turbine chamber containing an air turbine, a suction chamber containing a rotating brush, a main vent provided in a partition between the suction chamber and the turbine chamber facing the air turbine, and the main ventilation A floor nozzle for a vacuum cleaner, comprising a valve body that changes the opening area of the mouth according to wind pressure, and a shielding plate that opens and closes a sub-vent for taking in outside air and is integrated with the valve body.