JPH01280432A - Turbine nozzle for vacuum cleaner - Google Patents

Abstract

PURPOSE:To reduce the noise of a turbine wheel even when the flow velocity of a suction airflow passing a route is increased by causing the turbine wheel to have a blade train to be rotatingly-energized in receiving the suction airflow and the blade train formed so as to suppress the rotation. CONSTITUTION:Since a dust is not accumulated in a vacuum cleaner main body after the dust is rejected, the suction airflow to pass a subroute 22 and to flow into a turbine casing 8 collides with a proceeding wing train 23 at a very high speed, and thereby, a turbine wheel 4 starts to be rotated at the very high speed. On the other hand, due to the rotation, a retreating wing train 25 receives an air resistance in the turbine casing 8, it suppresses the rotation of the turbine wheel 4, the over-rotation of the turbine wheel 4 is prevented, and the rotation is stabilized. When the suction airflow is made more high-speed, the rotation suppressing effect of the retreating wing train 25 is simultaneously increased, consequently, the rotating speed of the turbine wheel 4 is made approximately fixed, and a very high-speed rotation condition is not generated. As a result, the noise due to a high frequency sound generated when the blade of the proceeding wing train 23 interruptively cuts the suction airflow and an oscillation generated due to the rotation of the turbine wheel 4 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a turbine nozzle connected to a hose/extension pipe of a vacuum cleaner.

Conventional technology Conventionally, in this type of turbine nozzle, a turbine wheel placed in the turbine nozzle is rotated by the suction air flow of a vacuum cleaner, and the generated rotational torque drives a rotating brush to rotate, which removes the roots of fibers such as carpets. The device was designed to improve the dust absorption performance and clean the carpet by scraping up the dust and inhaling it.

However, as the suction performance of vacuum cleaners has improved in recent years, the amount of suction air required for the first use or after the dust has been disposed of has increased. In this case, the turbine wheel will be rotated at extremely high speeds, which may shorten the life of the bearing structure of the turbine wheel and rotating brush, and cause high-frequency noise generated when the blades of the turbine wheel cut the high-speed intake airflow intermittently and at high speed. A problem arises in that noise increases due to this.

As a means to solve this problem, an invention described in Japanese Patent Application Laid-Open No. 62-41628 was made. In other words, an elastic body is installed on the turbine shaft that spreads outward due to centrifugal force during rotation, and when the turbine rotates at high speed, the elastic body that spreads outward due to centrifugal force receives air resistance, slows down the rotation of the turbine wheel, and prevents over-rotation. It is something.

Problems to be Solved by the Invention However, with the above technology, the elastic body repeatedly spreads outward and returns to its original state as the turbine wheel rotates and stops, causing damage, and the dust that is thrown away when it collides with the turbine wheel. It hits this elastic body and damages it, creating an unbalanced state and causing vibrations in the turbine shaft, causing problems such as increased noise.

The present invention solves this problem, effectively prevents ultra-high speed rotation of the turbine wheel under conditions of large suction air volume, and maintains sufficient durability, stabilizes the rotational speed of the turbine wheel and rotating brushes, The aim is to provide a turbine nozzle that is highly usable by improving the durability of the bearing and reducing noise and vibration.

Means for Solving the Problems The technical means of the present invention for solving the above problems comprises a rotating brush chamber that accommodates a rotating brush, a turbine chamber that incorporates a turbine wheel that rotationally drives this rotating brush, and a wind speed switching plate that changes the flow velocity of the suction airflow by changing the passage area of the communicating helical passage and rotates the turbine wheel when the flow velocity is increased; the turbine wheel has blades that are urged to rotate by receiving the suction airflow; and a blade row that suppresses this rotation.

Effect This effect is as follows. That is, when there is a large amount of suction airflow, the suction airflow is sped up by the wind speed switching plate and collides with the turbine wheel at high speed, acting on the blade row that is urged to rotate, causing the turbine wheel to rotate at high speed. On the other hand, the blade row that suppresses rotation receives surrounding air resistance due to this rotation, causing a rotation suppressing effect, preventing the turbine car from rotating at extremely high speeds, and stabilizing the rotation speed of the turbine car in high air volume areas. This reduces noise and improves the durability of the bearing.

Example An embodiment of the present invention will be described below with reference to the drawings.

In Figures 1 to 4, 1 indicates a hose attached to the vacuum cleaner body.
A turbine nozzle connected via an extension pipe (not shown), with a rotating brush chamber 3 containing a rotating brush 2 in the front, a turbine wheel 4 built in in the rear, an upper main body 5, a lower main body 6, and a connecting pipe. It has a turbine chamber 8 composed of 7. Connection pipe 7
is held between an upper body 5 and a lower body 6 so as to be rotatable within a certain range. A connecting pipe 9 is rotatably connected to the connecting pipe 7 via a connecting ring 10, and is connected to the hose or extension pipe. A front body 11 is removably connected to the upper body 5 and the lower body 6 by means of a pair of buckles 12, and covers the rotating brush chamber 3 from above. Brush bristles 13 are spirally arranged around the outer periphery of the rotating brush 2. Reference numeral 14 indicates a bearing vibrator that rotatably and slidably holds the turbine shaft 15 holding the turbine wheel 4; 16 indicates the turbine wheel 4 of the turbine shaft 15;
The belt is stretched between the opposite end of the belt and a pulley 17 attached to the end of the rotating brush 2.

Reference numeral 18 indicates an operating knob 19 that protrudes upward from the upper body 5, and a main passage 20 that communicates the turbine chamber 8 and the rotating brush chamber 3.
This is a wind speed switching board that integrally has a shielding plate 21 that opens and closes, and when the knob 19 is located on the turbine chamber side as shown in FIG.
When located at the end of the turbine nozzle 1, the shielding plate 21 slides toward the end as the wind speed switching plate 18 slides to open the main passage 20. Reference numeral 22 denotes an auxiliary passage formed in front of the turbine wheel 4, which constantly communicates the turbine chamber 8 and the rotating brush chamber 3.

The turbine wheel 4 has a forward blade row 23 formed opposite to the sub-passage 22 and a backward blade row 25 formed on the turbine shaft 14 side with a partition wall 24 in between. The advancing blade row 23 has a blade having a substantially arcuate cross-sectional shape and is urged to rotate so as to receive the suction airflow flowing into the turbine chamber 8 at a higher speed than the sub passage 22 . The retreating blade row 25 is formed linearly in the radial direction from the center to suppress rotation by the forward blade row 23.

Next, the operation of the above configuration will be explained.

When cleaning a carpet, the knob 18 is positioned on the turbine chamber 8 side, the main passage 20 is closed by the shielding plate 21, and the suction air flow is allowed to flow into the turbine chamber 8 through the sub passage 22. The incoming airflow collides with the forward blade row 23 and rotates the turbine wheel 4. This rotation is transmitted by the belt 16 to rotate the rotating brush 2, which scrapes up dust from the roots of the carpet fibers, making it possible to clean the carpet efficiently and easily.

By the way, when this turbine nozzle 1 is connected to the main body of a vacuum cleaner with good suction performance and the dust is started to be used or after the dust is disposed of, the dust passes through the sub passage 22 because the dust has not accumulated inside the vacuum cleaner main body. The suction airflow flowing into the turbine chamber 8 collides with the advancing blade row 23 at an extremely high speed. Therefore, the turbine wheel 4 begins to rotate at an extremely high speed. On the other hand, due to this rotation, the swept blade row 25 receives air resistance within the turbine chamber 8, which suppresses the rotation of the turbine wheel 4, thereby preventing over-rotation of the turbine wheel 4 and stabilizing the rotation. When the suction airflow becomes faster, the swept blade row 2
The rotation suppressing effect of the turbine wheel 5 is also increased, and therefore the rotation speed of the turbine wheel 4 is almost constant, and an extremely high speed rotation state does not occur. As a result, the noise caused by the high frequency sound generated when the blades of the advancing blade row 23 intermittently cut the intake airflow and the vibration caused by the rotation of the turbine wheel 40 are reduced, and the bearing structure of the turbine shaft 15 and rotating brush 2 is reduced. This improves the durability of the parts.

By the way, this effect is the same not only when the turbine nozzle 1 is floating in the air, but also when it is actually used when it is grounded on a carpet. Even when used, the rotational speed of the turbine wheel 4 and rotating brush 2 can be kept constant to prevent the aforementioned increase in noise and decrease in durability, and there is also the effect that it can be used regardless of the type of carpet.

Further, since the swept blade row 25 can be formed strongly like the forward blade row 23, it will not be damaged during normal use.

Next, the second embodiment will be explained based on FIG.
The same parts as in the first embodiment are given the same reference numerals.)

The turbine wheel 4 has a forward row of blades 23 formed opposite to the auxiliary passage 22 and a rearward row of blades 25 formed on the turbine shaft 14 side with a partition wall 24 in between. The forward blade row 23 has a blade having a substantially arcuate cross-sectional shape so as to receive the suction airflow flowing into the turbine chamber 8 at a higher speed than the sub passage 22.
The swept blade row 25 is twisted in the opposite direction to the forward blade row 23 and has a substantially arcuate cross section.

The effect of the above configuration is similar to that of the first embodiment, but the effect of suppressing the rotation of the turbine wheel 4 is high.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, as described above, a rotating brush chamber that accommodates a rotating brush therein and has a suction port on the lower surface, a turbine chamber that incorporates a turbine wheel that rotationally drives the rotating brush, and a turbine chamber that includes a turbine wheel that rotatably drives the rotating brush; A passage communicating the chamber and the rotating brush chamber,
and a wind speed switching plate that changes the flow velocity of the passing suction airflow by changing the passage area and rotates the turbine wheel when the flow velocity is increased, and the turbine wheel is urged to rotate by receiving the suction airflow. By having a row of blades and a row of blades formed to suppress this rotation, even if the flow velocity of the suction air passing through the passage increases, the turbine car can be prevented from rotating at extremely high speeds, reducing noise and at the same time preventing the rotation of the bearing. This makes it possible to provide a turbine nozzle that has improved durability and is highly usable.

[Brief explanation of the drawing]

FIG. 1 is a horizontal sectional view of a turbine nozzle according to an embodiment of the present invention with the upper body and front body partially removed, FIG. 2 is a perspective view of the turbine nozzle, and FIG. 3 is a Z-Z sectional view in FIG. 1. FIG. 4 is a perspective view of a turbine wheel, and FIG. 5 is a perspective view of a turbine wheel showing a second embodiment. 1... Turbine nozzle, 2... Rotating brush, 3... Rotating brush chamber, 4... Turbine wheel, 8... Turbine chamber, 18
...Wind speed switching plate, 20...Main passage, 22...Sub-passage, 2
3... forward wing row, 25... retreating wing row. Name of agent: Patent attorney Toshio Nakao and one other person Figure 3

Claims (1)

[Claims] A rotating brush chamber that accommodates a rotating brush inside and has a suction port on the lower surface, a turbine chamber that includes a turbine wheel that rotationally drives the rotating brush, a passage that communicates the turbine chamber and the rotating brush chamber, and this passage. a wind speed switching plate that changes the flow velocity of the suction airflow passing through it by changing its area, and rotates the turbine wheel when the flow velocity is increased; the turbine wheel is driven to rotate by receiving the suction airflow; and a blade row formed to suppress this rotation.