JPH04179900A - Air cleaner - Google Patents

Abstract

PURPOSE:To increase the volume of suction air and reduce noise by constituting an impeller of a front shroud, a rear shroud, plural number of blades between both shrouds and plural number of straightening plates inclined toward the inner peripheral side from the outer peripheral side on the inner surface of the front shroud on the impeller. CONSTITUTION:An impeller 18 is formed of a front shroud 19, a rear shroud 20, plural number of blades 21 arranged between both shrouds 19 and 20 and plural number of straightening plates which are arranged protrusively on the inside surface of the front shroud 19 and incline toward the inner peripheral side from the outer periphery of the impeller 18. When air is sent out to a vortical chamber 23 by means of the blades 21 of the rotating impeller 18, air flow is produced so as to leak out in the upward direction of the blades 21 from the space between the blades 21. With regard to this air flow, since the upper edges of the blades 21 are shielded by means of the rear shroud 20, air on the inside surface of the impeller 18 can be flowed out from the space between the blades 21 without disturbing the air flow. Furthermore, vortical flow produced on the inside surface of the impeller 18 can be flowed naturally in the centrifugal direction along the inclined surfaces of the straightening plates 22 together with rotation of the impeller 18.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an air cleaner that purifies air by circulating air with an impeller.

BACKGROUND OF THE INVENTION Conventional air cleaners of this type generally have a configuration as shown in FIGS. 7 and 8.

The configuration will be described below with reference to the drawings.

As shown in the figure, a dust collecting filter 1 is disposed on the intake side, and an impeller 3 rotationally driven by an electric motor 2 is disposed behind it.

When the electric motor 2 is put into operation, the impeller 3 rotates, and the air intake grid 5 attached to the front of the air purifier body 4, the dust collection filter 1, the intake port 6, the impeller 3, and the upper surface of the body 4 are attached. Air flows inside the main body 4 along the route of the exhaust grate 7. As a result, dirt in the air is captured by the dust filter 1, and purified air is exhausted from the exhaust grid 7.

Problems to be Solved by the Invention In such a conventional configuration, the dirty air flowing into the main body 4 is purified by passing through the dust collection filter, but at the same time, the air becomes turbulent and flows through the intake port 6. and flows into the impeller 3. For this reason, vortices are generated on the inner surface of the impeller 3 and between the plurality of blades 8, reducing the fluid efficiency of the impeller 3, resulting in a reduction in the amount of air sucked in.

Furthermore, the dust filter 2 also acts to block the flow of air and reduce the flow rate. According to experiments, in order to achieve the same flow rate, the rotational speed of the impeller 4 had to be approximately doubled compared to when the dust filter 2 was not used.

Therefore, the cleaning ability inevitably decreases, and in order to prevent the flow rate from decreasing, it is necessary to rotate the impeller 4 at high speed. However, in the conventional configuration, there were the following problems when the impeller 4 was rotated at high speed.

Between the plurality of blades 8 constituting the impeller 4, there is a biased coarse and dense flow in which the flow on the downstream side is dense and the flow on the upstream side is coarse with respect to the rotation direction of the impeller 4. When the airflow sent out from the impeller 4 flows into the swirl chamber 9, the dense and dense airflow alternately collides with the tongue portion 10 that constitutes the swirl chamber 9, which causes pressure fluctuations in the flow. was causing noise. The frequency of this noise is proportional to the product of the rotation speed N of the impeller 4 and the number Z of the 80 blades, and is generally called NZ sound.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an air cleaner that improves the fluid efficiency of the impeller, increases the suction air volume, and reduces noise.

Means for Solving the Problems In order to achieve the above object, the present invention has a first means that includes a main body, a dust collecting filter disposed on the intake side inside the main body, and a dust collecting filter disposed at the rear of the dust collecting filter. The impeller is provided with an impeller that is rotationally driven by an electric motor, and a swirl chamber that guides the air flow sent out from the impeller to an exhaust port, and the impeller is arranged between a front shroud, a rear shroud, and both shrouds. The impeller includes a plurality of blades disposed on the front shroud, and a plurality of rectifying plates erected on the inner surface of the front shroud and inclined from the outer circumferential side to the inner circumferential side of the impeller.

A second means includes an impeller that includes a front shroud, a rear shroud, a plurality of blades disposed between the two shrouds, and a plurality of blades disposed between the blades, from an outer circumferential side to an inner circumferential side of the impeller. It consists of a rectifying plate that slopes high toward the side.

A third means includes an impeller including a front shroud, a rear shroud, and a plurality of blades arranged between the shrouds and tilted in the direction of rotation.

Operation The present invention has the above-described configuration, and in the first means, the impeller is provided with a front shroud, a rear shroud, a plurality of blades disposed between both the shrouds, and an inner surface of the front shroud, and the impeller is installed vertically on the inner surface of the front shroud. By constructing a plurality of rectifying plates that slope from the outer circumferential side to the inner circumferential side of the wheel, the air flow that leaks from between the blades to the upper part of the blades and flows in the circumferential direction of the impeller is diverted to the rear surface. The shroud blocks the vortices generated on the inner surface of the impeller and flows in a centrifugal direction along the slope of the current plate as the impeller rotates, allowing the vortices on the inner surface of the impeller to flow smoothly between the blades. be able to. Thereby, the amount of air sucked into the impeller can be increased.

In the second method, the impeller is arranged between a front shroud, a rear shroud, a plurality of blades disposed between both the shrouds, and a plurality of blades disposed between the blades and arranged in a direction from the outer circumferential side of the impeller toward the inner circumferential side. In addition to the effect of the first means, by constructing the rectifying plate with a high slope, it is possible to block the circulation of the vortex generated between the blades, and also to rectify the flow between the blades and send it to the vortex chamber. This improves the fluid efficiency of the impeller and further increases the suction air volume.

In the third method, the impeller is configured with a front shroud, a rear shroud, and a plurality of blades arranged between both shrouds at an angle in the direction of rotation. Since the coarse flow in between can be made into a uniform flow, it is possible to reduce the NZ sound caused by the collision of the coarse flow with the tongue portion of the swirl chamber. This makes it possible to reduce noise.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 6.

1 and 2 show an embodiment of the first means, in which an intake grid 12 is formed on the front surface of the main body of the air purifier, and an exhaust grid 13 is formed on the upper surface, and inside the air purifier body there is formed an air intake grid 12 on the front surface and an exhaust grid 13 on the intake side. A dust collection filter 14 and an electric motor 15 are attached to the rear thereof, and
A support plate 17 having an air intake port 16 is further provided with an impeller 18 rotatably driven by an electric motor 15 behind the air intake port 16 .

The impeller 18 includes a front shroud 19, a rear shroud 20, a plurality of plates 21 disposed between both shrouds 19, 20, and an inner surface of the front shroud 19, and extends from the outer circumference to the inner circumference of the impeller 18. It is formed of a plurality of rectifying plates 22 that are inclined toward the side.

Note that the distal end portion 22a of the baffle plate 22 extends near the inner peripheral portion 16a of the suction port 16, and is shaped so as to guide the airflow from the suction port 16 between the blades 21.

In the above configuration, when the impeller 18 is rotated by the electric motor 15, indoor dirty air flows in from the intake grid 12 of the main body 1]. This air has fine dust captured and removed by the dust collecting filter 14, becomes clean air, and flows into the impeller 18 through the intake port 16. The clean air is then discharged toward the outer circumference of the impeller 18 and sent into the room through the exhaust grid 13.

Here, the function of the rear shroud 20 will be explained.

Air is sent out to the swirl chamber 23 by the blades 21 of the rotating impeller 18, and when this air is sent out, an air flow is generated that leaks from between the blades 21 to above the blades 21. This airflow is undesirable because it disturbs the airflow entering the swirl chamber 23 through the blades 21, but in this embodiment, the upper end of the blades 21 is shielded by the rear shroud 20, so that no leakage occurs above the blades 21. This allows the air on the inner surface of the impeller 18 to flow away from between the blades 21 without disturbing the airflow.

Next, the function of the current plate 22 will be explained.

The airflow turbulent by passing through the integrated filter 14 flows into the impeller 18 and is sucked into the blades as it is, forming a vortex between the blades 21. This vortex causes a decrease in air blowing efficiency, but in this embodiment, since the baffle plate 22 is provided upright on the front shroud 19, the impeller 1
The vortex generated on the inner surface of the impeller 18 can naturally flow in the centrifugal direction along the inclined surface of the baffle plate 22 as the impeller 18 rotates, and the vortex on the inner surface of the impeller 18 can smoothly flow between the blades 21. It is possible to flow it to

In this way, according to the embodiment of the first means of the present invention, the amount of air sucked into the impeller 18 can be increased.

Next, FIGS. 31 and 4 show an embodiment of the second means, in which the impeller 24 has a front shroud 25, a rear shroud 26, and a plurality of blades 27 disposed between the front shroud 25 and the rear shroud 26. and a rectifying plate 28 which is disposed between each blade 27 and slopes high from the outer circumferential side to the inner circumferential side of the impeller 24.

In this embodiment, as shown in FIG. 4, the current plate 28 is disposed on the inner surface of the curved blade 27, or may be disposed on the inner surface of the back side area if necessary. be.

In the above configuration, when the impeller 24 rotates, the impeller 2
The air on the inner surface of the blade 4 is sent to the swirl chamber 23 by the blades 27, or a vortex is generated between the blades 27, and the vortex circulates through the blades 27 and deteriorates the air blowing efficiency of the impeller 24. In this embodiment, a rectifying plate 28 is disposed between the blades 27 to deal with this circulating eddy current, so the rectifying plate 28 rectifies the flow between the blades 27,
As the airflow rotates, a vortex flow is caused to flow in a centrifugal direction along the slope of the baffle plate 28, and the airflow can be smoothly sent to the vortex chamber 23.

As described above, according to the embodiment of the second means of the present invention, the rectification efficiency of the impeller 24 is improved, and the suction air volume can be further increased.

Next, FIGS. 5 and 6 show an embodiment of the third means, in which an impeller 29 is arranged between a front air shroud 30, a rear shroud 31, and a plurality of impellers arranged at an angle in the rotational direction A between both shrouds. It is formed with a blade 32.

In the above configuration, by arranging the blades 32 at an angle to the rotational direction of the impeller 29, the flow between the blades 32 on the lower side with respect to the rotational direction of the impeller 29 is dense, and the flow on the upper side is coarse. As the impeller 29 rotates, a circumferential flow from a dense part to a coarse part occurs along the inclination of the blades 32, and the flow between the blades 32 becomes less dense and becomes a uniform flow. can do. This makes it possible to reduce the NZ sound caused by the collision of the coarse flow with the tongue portion 34 of the swirl chamber 33.

In this way, according to the embodiment of the third means of the present invention, it is possible to reduce the noise caused by the density of the flow between the blades 32.

1st as above. Second. By using the embodiment of the third means or a configuration in which these are combined, it is possible to increase the suction air volume with an impeller of the same size as compared to a conventional impeller. On the other hand, if the same suction air volume as a conventional impeller is sufficient, it is possible to reduce the outer diameter of the impeller, reduce the thickness of the impeller, or even reduce the rotation speed of the impeller. This makes it possible to realize an air purifier that is smaller, thinner, and quieter.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, by the first means, the impeller is connected to the front shroud, the rear shroud, and the plurality of blades disposed between the shrouds. , consists of a plurality of rectifier plates that are installed upright on the inner surface of the front shroud and are inclined from the outer circumferential side to the inner circumferential side of the impeller, so that the vortex flow on the inner surface of the impeller can flow smoothly between the blades. Therefore, it is possible to provide an air cleaner with a large intake air volume of the impeller.

Further, by the second means, the impeller is arranged between a front shroud, a rear shroud, a plurality of blades disposed between both shrouds, and a plurality of blades disposed between each blade, from an outer circumferential side to an inner circumferential side of the impeller. By constructing a rectifying plate that is tilted towards the blade, it is possible to block the circulation of the vortex generated between the blades, and also rectify the flow between the blades and send it to the vortex chamber. Improved efficiency,
An air cleaner with a larger suction air volume can be provided.

Furthermore, according to the third means, the impeller is configured with a front side shroud, a rear side shroud, and a plurality of blades arranged between the two shrouds at an angle in the direction of rotation of the impeller. Since the coarse flow can be made into a uniform flow, it is possible to reduce the NZ sound caused by the collision of the coarse flow with the tongs of the swirl chamber, thereby creating a quiet air purifier with low noise. Can be provided.

In addition, by using these means alone or in combination, it is possible to provide an air purifier with increased suction air volume.
It is also possible to provide an air purifier that is smaller, thinner, and quieter.

4.1 General Tatami %.

FIG. 1 is a side sectional view of an air cleaner according to an embodiment of the first means of the present invention, FIG. 2 is a front view of the same impeller, and FIG. 3 is an air cleaner according to an embodiment of the second means of the present invention. 4 is a front view of the same impeller, FIG. 5 is a partially cutaway view of the swirl chamber of the air purifier according to the embodiment of the third means, and FIG. 6 is the same impeller. FIG. 7 is a side sectional view of a conventional air cleaner, and FIG. 8 is a partially cutaway side view of the same swirl chamber.

11... Body, 14... Dust collection filter, 15... Electric motor, 18, 24.29...
... Impeller, 19°25.30 ... Front shroud, 20, 26.31 ... Rear shroud, 21, 27.32 ... Blade, 22.28
・・・・・・Rectifying plate, 23.33・・・・Vortex chamber Agent’s name Patent attorney Haruaki Koebi and 2 others rt Real salary 2θztl (I 箆2fig24°゛”) Section 2S 畦Side Shrak F 26-J side Reyurakto 4 Figure 21゜!η 01i IIr+'-L -r'＞ ;> L side!1ljl@-M' = IH Cao'＾晦太郎trap齬齿Fig. 7

Claims (3)

[Claims] (1) A main body, a dust collecting filter placed on the intake side inside the main body, an impeller installed behind the dust collecting filter and rotated by an electric motor, and exhausting the air flow sent out from the impeller. The impeller includes a front shroud, a rear shroud, a plurality of blades disposed between the two shrouds, and an inner surface of the front shroud, and the impeller includes a An air purifier consisting of multiple rectifier plates that slope from the outer circumferential side to the inner circumferential side. (2) The impeller includes a front shroud, a rear shroud, a plurality of blades disposed between the two shrouds, and a plurality of blades disposed between the blades, extending from the outer circumferential side of the impeller toward the inner circumferential side. 2. The air cleaner according to claim 1, further comprising a rectifying plate that is tilted high. (3) Claims 1 and 2, wherein the impeller comprises a front shroud, a rear shroud, and a plurality of blades arranged between the shrouds and inclined in the rotation direction of the impeller.
Any of the air purifiers listed.