JPH0321312A - Air cleaner - Google Patents

Abstract

PURPOSE:To reduce noises by providing a plurality of blades on both surfaces of a shroud having an opening on an impeller and arranging the positions of the blades on both surfaces alternately. CONSTITUTION:A dust collecting filter 24 is disposed on the air suction side and an impeller 28 rotated and driven through a motor 25 is disposed on the rear of the filter 24. A plurality of blades 30 and 31 are provided on both surfaces of a shroud 29 having an opening 24 of the impeller 28, and the positions of the blades on both surfaces are arranged alternately. That is, the phases of flow between the coarse and dense flows between the plate on one surface of the shroud and the coarse and dense flows of the blade on the other surface of the shroud and deviated to relax the coarse and dense flows coming out of the impeller and rectify the flows, which reduces noises generated by the turbulence.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air cleaner having an impeller.

Conventional technology A conventional air purifier of this type is shown in Fig. 7. It is constructed as shown in FIG. A dust collection filter 1 is disposed on the intake side, and an impeller 3 is rotatably driven by an electric motor 2 behind it.
is installed.

When the electric motor 2 is put into operation, the impeller 3 rotates, and the air intake grid 5. *
Dust filter 1. Intake port 8. Impeller 3. Air flows through the main body 4 in the order of the exhaust grid 7 attached to the upper surface of the main body 4, and dirty air is purified by the dust filter 1.

The invention tries to solve the problem! However, in the above-mentioned collection, the dirty air flowing into the main body 4 passes through the dust collection filter 1. Therefore,
A thin air flow is generated on the inner circumferential side of the impeller 3, which improves efficiency (airflow does not enter between the blades 8). Moreover, since the impeller 3 rotates at high speed, the flow between the blades 8 is denser on the upper side and rougher on the lower side with respect to the rotation direction of the impeller 3. It was a turbulent flow with a slight bias.

Therefore, these reduce the amount of air sucked into the impeller 3 and cause noise.

Therefore, the present invention is intended to solve such problems, and its primary purpose is to reduce noise.

The first, second, seventh, and third purposes are to improve the fluid efficiency of the impeller and increase the suction air volume.

Means for Solving the Problems The technical means of the present invention for overcoming the above-mentioned first object is to provide a plurality of plates on both sides of the shroud, and the positions of the plates on both sides are arranged alternately. This is achieved by using an impeller with a

The technical means of the present invention for overcoming the second object of the present invention is to gradually extend the support between the openings of the shroud of the impeller from the upper side to the lower side with respect to the rotation direction of the impeller. The cross-sectional shape is such that the height is high.

Furthermore, the technical means of the present invention for achieving the third objective is to adjust the blade length to a short blade located on the outer circumference side of the opening on one side of the shroud, and a short plate located on the inner circumference of the opening on the other side. The method is to use impellers each having long blades that extend to the sides.

action The effects of the first means described above are as follows.

By providing a plurality of blades on both sides of the shroud and alternating the positions of the blades on both sides, the phase of the flow density between the blades on one side of the shroud and the flow density between the blades on the other side of the shroud can be adjusted. Because the
When the impeller flows out, the coarse flow is relaxed,
The flow will be rectified and the noise generated by the turbulence will be reduced.

The effect of the second means is achieved by forming the supporting part between the openings of the shroud of the impeller into a cross-sectional shape that gradually becomes higher from the upper side to the lower side with respect to the rotation direction of the impeller. The thin flow that occurs on the inner circumferential side of the impeller due to flow turbulence flows along the cross-sectional shape of the support part as the impeller rotates, so that the thin flow can be effectively passed between the blades. Become. Therefore, the amount of air sucked into the impeller can be increased.

Furthermore, the effect of the third means is to change the blade length of the impeller to a short blade located on the outer circumference side of the opening on one side of the shroud, and a long blade extending to the inner circumference side of the opening on the other side. By doing so, the thin air generated on the inner circumferential side of the impeller can flow between the casing and the blades, thereby increasing the amount of air sucked into the impeller.

Example Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.

In FIGS. 1 and 2, lT of the main body 21 of the air purifier
An intake grid 22 is formed on the il side, and an exhaust grid 23 is formed on the top surface, and inside thereof there is a substantially circular intake port 26 holding a dust collection filter 24 on the intake side and an electric motor 25 at a position behind it. There is a support plate 27 with a support plate 27, and an impeller 28 rotatably driven by an electric motor 26 is located behind the intake port 26.

This impeller 28 has a plurality of blades 30, 31 on both sides of the shroud 29, and the positions of the blades 31 on one side are alternately shaped to be between the positions of the blades 30 on the other side.

The flow of fluid is caused by the rotation of an impeller 28 by an electric motor 26, and as the impeller 28 rotates, dirty air flows in from the intake grid 22 of the main body 21, fine dust etc. are removed by the dust collection filter 24, and the air becomes clean and flows into the intake port. 26 into the impeller 28, and is discharged toward the outer circumference of the impeller 28, and is discharged from the exhaust grate 23.
Exit through <.

Since this impeller 28 rotates at high speed, the blades 30.
In the conventional example, the flow between the plates 30.
31, so when it flows out of the impeller 28, the coarse flow is relaxed and the flow is rectified, reducing the noise generated by the turbulence. It is.

1. Figure 3. FIG. 4 shows a second embodiment.

In addition to the first embodiment, the cross-sectional shape of the support portion 36 between the openings 34 of the shroud 33 of the impeller 32 is made gradually higher from the upper side to the lower side with respect to the rotation direction of the impeller 32. As a result, the thin flow generated on the inner circumferential side of the impeller 32 due to the turbulence of the flow can be effectively flowed along the cross-sectional shape of the support portion 35 as the impeller 32 rotates. Play the thin stream well with 36
．． You will be able to stream it in 37 days. Therefore, the fluid efficiency of the impeller 32 is improved and the suction air volume is increased.

Furthermore, Fig. 6. FIG. 6 shows the third embodiment.

In addition to the first embodiment, if the blade length of the impeller 3B is set at one side of the shroud 39, the opening 4 of the shroud 39 is
By making the short blades 41 extending toward the outer circumferential side of the impeller 38 and the long blades 42 extending toward the inner circumferential side on the other side, the thin flow generated on the inner circumferential side of the impeller 38 can be avoided. Long. It becomes possible to flow between the short blades 42 and 41.

Therefore, the fluid efficiency of the impeller 38 is improved, and similarly to the second embodiment, the suction air volume can be increased in this embodiment as well. Note that if all the blades on both sides of the shroud 39 are extended to the inner peripheral side of the opening 40 of the shroud 39, the air flow will become a flow on the lower surface of the shroud 39, and the intake air volume will be reduced.

Effects of the Invention As explained above, the present invention provides blades on both sides of the shroud of the impeller, and alternately shapes the blades on one side so that they are between the positions of the blades on the other side. This is intended to reduce the noise generated by the turbulence of the flow.

By making the cross-sectional shape of the supporting part between the openings of the impeller shrakudo gradually become higher from the upper side to the lower side with respect to the rotation direction of the impeller, or by increasing the blade length of the impeller. On one side of the shroud, the outer periphery of the opening of the shroud is made into a short blade shaped like {1111}, and on the other side, the blade is made into a long blade that extends toward the inner circumference, thereby increasing the suction air volume of the impeller. .

Furthermore, by increasing the amount of suction air, the cleaning ability is increased, making it possible to provide a high-performance air cleaner.

Furthermore, when obtaining the same air force as in case 1, the air cleaner can be made smaller, thinner, and less noisy than conventional air cleaners due to the increased suction air force.

[Brief explanation of drawings]

Fig. fS1 is a sectional view of the air purifier according to the first embodiment of the present invention, Fig. 2 is a front view of the impeller, and Fig. 3 is the 4th sectional view of the air purifier according to the first embodiment of the present invention.
A front view of the impeller in the S2 embodiment, FIG. 4 shows the impeller j
A detailed explanatory diagram of the support part of p, and FIG. 6 is a sectional view of the air purifier in the third embodiment of Masaaki Moto! Figure 86 is a front view of the impeller, Figure tJS7 is a cross-sectional view of the conventional air purifier,
FIG. 8 is a front view of the impeller. 21...Body, 24...Dust filter, 26...Intake port, 2B, 32. 38...
...impeller, 29,33.39...shroud. 30, 31, 36. 37...
Plaid, 34. 40...opening, 36...
...Support part, 41...Short blade, 42...
...Long plaid.

Claims (3)

[Claims] (1) Equipped with a dust collection filter placed on the intake side and an impeller located behind the dust collection filter and rotated by an electric motor, and this impeller has multiple blades on both sides of a shroud having an opening The air purifier has an air purifier in which the blades on both sides of the shroud are arranged alternately. (2) The air cleaner according to claim 1, wherein the support portion between the openings of the shroud of the impeller has a cross-sectional shape that gradually becomes higher from the upper side to the lower side with respect to the rotation direction of the impeller. (3) The air purifier according to claim 1 or 2, wherein one side of the shroud is provided with a short blade located on the outer circumferential side of the opening, and the other side is provided with a long blade extending to the inner circumferential side of the opening. .