JPS6037726B2 - Vacuum cleaner air turbine nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air turbine nozzle for a vacuum cleaner in which a rotating brush is rotated by an air turbine.

Conventional technology Traditionally, air turbine nozzles have been put into practical use in vacuum cleaners, which use the air force of the suction to rotate an air turbine, and use that force to rotate a brush for cleaning dust. ing.

However, since the output of the air turbine is low, there are problems such as the rotation stopping when using jutan with long piles, or the air turbine making a lot of noise when used when the rotation speed is increased. The reality was that they were not getting it. The structure of a conventional air turbine will be explained below.

In FIG. 1, left and right blades 100, 101 are arranged in a straight line. In addition, FIGS. 2 and 3 show the left and right blades 102, 1.
03 are shifted instead of being aligned in a straight line.

Problems to be Solved by the Invention However, in the former turbine, when the high-speed injection (generally 70 to 100'sec) from the injection port collides with the blades 100 and 101, a very large impact is generated, resulting in high noise. happens.

This noise is thought to be due to the fact that the jet flow that was being injected into the blade chamber B switches to the blade chamber A at the next moment, and at this time a very large pressure wave is generated. However, in the case of this conventional example, if only the output of the air turbine is considered, the output is high because the blade chambers A and B completely receive the energy of the injection. For it,
In the latter turbine, the blades 102 and 103 are not aligned in a straight line, but are shifted so that the blade chambers A and B are connected with a gap C. In this case, the ejected airflow is simultaneously caused by the blades 102 and 1
It does not hit the tip of 03 in a concentrated manner, resulting in lower noise. However, the output of the air turbine is lower than in the system of FIG. 1 because the injection energy is dispersed through the gap C. As explained above, conventional turbines each have their own advantages and disadvantages, and have not been able to satisfy both noise problems and efficiency.

In view of the above points, the present invention provides an air turbine nozzle that satisfies both noise and efficiency.

Means for Solving the Problems In order to solve these problems, the present invention provides a turbine that rotates by receiving airflow, an injection port that guides the suction airflow to the turbine, and a rotational force of the turbine. The turbine has a cleaning rotating brush that is rotated by the transmission of power and scrapes up dust from the floor surface, and the turbine has a large number of blades formed along the axial direction, and the space between each blade is closed at one end. It has a left impeller and a right impeller that are open at the end of the pond, with the open sides of the left and right impellers facing each other, and a disc-shaped flow dividing plate interposed between them to connect the two impellers. At the same time, the blades of both impellers are not aligned in a straight line, but are shifted.
Moreover, the injection port is provided corresponding to this flow dividing plate.

Effect: According to this configuration, since the airflow does not collide with the left and right blades at the same time, noise generation can be suppressed.

In addition, the airflow effectively acts on the left and right blades to generate high output. EXAMPLE An example will be described below based on FIGS. 4 to 8.

In the figure, 1 is a main body, which is combined with a cover 2 to form a box.

A cover 3 is rotatably attached to the main body 1, and is prevented from detaching from the main body 1 by a stop mechanism 4.

The internal space surrounded by the main body 1 and the cover 2 is divided into an intake chamber 6 and an impeller chamber 7 by a partition plate 5 formed integrally with the cover 2. An injection port 8 is provided between the intake chamber 6 and the impeller chamber 7, and the injection port 8 has a closed cross-sectional shape close to a square.
It is configured to impinge on a turbine 9 located within. The rotational force of the turbine 9 is transmitted through a turbine shaft 10 to a rotating cleaning brush 11 by a belt (not shown). As shown in FIGS. 5 to 7, the turbine 9 has a structure including a right impeller 14, a left impeller 15, and both impellers 14.
, 15. As shown in FIG. 6, the impellers 14 and 15 are arranged so that the end lines of the blades 17 and 18 are not in a straight line, and are staggered from each other.
In the connected state, the blade chambers D and E are completely partitioned by the flow dividing plate 16 as shown in FIG.
, E so that there is no air flow between them. The injection port 8 is located in the center of the turbine 9, that is, in the flow dividing plate 1.
6, and the airflow exiting the injection port 8 is directed to the flow dividing plate 1.
6, and is arranged so that the flow is divided into blade chambers D and E. In the above-mentioned formation, first, the entire jet flow is divided into two by the flow dividing plate 16 into the impeller right 14 side and the impeller left 15 side. The left and right flows within the turbine 9 do not merge. Therefore, since the blade chambers ○ and E surrounded by the blades 17, 18, and the flow divider plate 16 are independent, the same effect as shown in FIG. 1 of the conventional example can be obtained in terms of efficiency. Furthermore, in the configuration shown in Figure 2, when the injection directed toward the center of the turbine enters the blade and is split into the left and right impellers, there is nothing to urge the flow, resulting in a very unstable flow. This was a factor that induced vibrations and noise in the turbine, but in the case of this example, the flow divider plate 16 was installed in the center of the jet stream, making it possible to create a stable flow to the left and right blades, thereby reducing the occurrence of vibrations, etc. decreases in the middle of the day. In addition, the output was improved by stabilizing this flow. Next, the effect of arranging the left and right blades 17, 18 in the middle will be explained.

When the blades shown in Figure 1 of the subordinate example are in a straight line, the jet impinges on the blade tips simultaneously on all blades,
For this reason, a severe impact occurs, but in the case of this embodiment, it does not hit the left and right blades at the same time, and as explained earlier, the flow within the blades can be stabilized. It has been confirmed through experiments that the noise generation is equal to or lower than that of the conventional configuration shown in FIG. 2. Next, the effect of the flow dividing plate 16 will be explained based on FIG. 8 based on an example of the results of repeated experiments.

As shown in Figure 7, the inner diameter of the turbine is D, and the outer diameter is D2.
Assuming that the outer diameter of the flow dividing plate 16 is D3, the inner/outer flanges ratio D, /D2 of the turbine is 0.5 to 0. We have conducted many experiments using neck-range turbines, and we will explain some of the most representative ones.
That is, the effect of the outer wall D3 of the flow dividing plate 16 was investigated for a turbine with an inner/outer wall ratio D, /D2 of 0.4. The characteristics are calculated using turbine efficiency, but the conditions are that the main body and accessories are all the same, and the suction power of the vacuum cleaner is also constant. To explain in more detail, the impeller outer diameter D2 = 68 ribs,
The suction power of the vacuum cleaner is 100W with 27 legs.
I did it with something. The results are shown in Figure 8, and D3/
When D2 is 0.4, there is no flow divider. What is clear from this result is that when D3/D2 is 0.7 or more, a considerable improvement in efficiency can be obtained. Although it is extremely difficult to completely analyze the flow inside the blade, experimental results show that D3/D2 is in the range of 0.7 to 1.0.
Satisfactory efficiency was obtained in the case of Effects of the Invention As is clear from the above description, the present invention can both improve turbine efficiency and solve the noise problem, and has extremely great industrial value.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a conventional turbine, Fig. 2 is a perspective view of another follower, Fig. 3 is a sectional view of the same, and Fig. 4 is a perspective view of an air turbine nozzle employing the present invention. 5 is an exploded perspective view of the turbine, FIG. 6 is an assembled perspective view of the turbine, FIG. 7 is a sectional view of the same, and FIG. 8 is a graph of turbine efficiency in the present invention.

8... Injection port, 9... Turbine, 14...
... Impeller right, 15... Impeller left, 16...
...Broadcast plate, 17,18...Blade.

Figure 1 Figure 2 Figure 3 Figure 6 Figure 4 Figure 5 Figure 7 Figure 8

Claims (1)

[Claims] 1. A turbine that rotates in response to airflow, an injection port that guides the suction airflow to the turbine, and a cleaning rotating brush that rotates by being transmitted with the rotational force of the turbine and scrapes up dust from the floor surface. The turbine has a large number of blades formed along the axial direction, and has a left impeller and a right impeller in which the space between each blade is closed at one end and open at the other end,
The open sides of the left and right impellers are made to face each other, and a disk-shaped flow divider plate is interposed between them to connect the two impellers, and the blades of the two impellers are not aligned in a straight line but shifted. An air turbine nozzle for a vacuum cleaner, characterized in that the injection port is provided corresponding to the flow dividing plate. 2 The inner diameter of the turbine is D_1, the outer diameter is D_2, the outer diameter of the flow divider plate is D_3, and D_1/D_2 is 0.2 to 0.5.
The air turbine nozzle for a vacuum cleaner according to claim 1, wherein the dimensional relationship is set to D_3/D_2≧0.7.