JP2001234899A - Air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaner reduced in noise and improved in the collecting efficiency of a filter. SOLUTION: This air cleaner is constituted by providing an air duct at a body case, forming a nearly spiral air channel part 4 near a discharge port 3 of the main duct, providing a multiblade fan 5 in the air channel part 4, and providing the filter on the way of the air duct leading to the multiblade fan 5. A projecting stop part 7 for shutting out back-flow flowing in from the outside is formed on the side wall opening edge inner side of the discharge port 3, and a back-flow space 8 for rolling back the air blown out of the multiblade fan 5, to the outside to create back-flow inside, is provided between the projecting step part 7 and the end part outer periphery of the multiblade fan 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifier for purifying air by collecting dust and odor contained in the air.

[0002]

2. Description of the Related Art Conventionally, an air purifier that collects dust, odor and the like contained in air and purifies the air has been known. This type of air washer is configured, for example, as shown in FIG. That is, the wind tunnel 4 is formed near the discharge port 3 formed in the main body case 1, and the sirocco fan 5 is provided in the wind tunnel 4. The sirocco fan 5 is provided on a shaft 20 rotatably supported by a bearing 21, and is rotated by being driven and rotated by a motor (not shown). In this case, a filter (not shown) for collecting dust, odor and the like is provided in the middle of the air path up to the wind tunnel section 4 in the main body case 1.

Therefore, in this case, the sirocco fan 5
Is rotated, external air is sucked into the main body case 1, and the sucked air is discharged from the discharge port 3 through the air passage and the wind tunnel 4. At this time, dust, odor, and the like are collected from the air flowing in the middle of the air passage by the filter, and the air is purified, and the purified air is discharged from the discharge port 3. Therefore, by installing and operating this air purifier in a room, it is possible to purify while circulating the air in the room.

[0004]

However, in the above-mentioned prior art, if the pressure loss of the filter is large, the amount of air supplied to the sirocco fan 5 in the wind tunnel portion 4 becomes insufficient. To compensate, air is sucked in from the side end of the discharge port 3 near the end of the sirocco fan 5, and a backflow b along the side wall occurs in the discharge port 3. For this reason, there has been a problem that noise is increased due to the contact between the main flow a discharged from the discharge port 3 by the sirocco fan 5 and the backflow b. Moreover,
The external air sucked in as the backflow b is discharged as it is from the discharge port 3 by the sirocco fan 5 without being cleaned by the filter, so that there has been a problem that the collection efficiency by the filter is reduced.

SUMMARY OF THE INVENTION The present invention has been made in order to solve all of the problems in the prior art described above, and an object of the present invention is to provide an air purifier in which noise is reduced and collection efficiency by a filter is improved. It is.

[0006]

According to a first aspect of the present invention, there is provided an air purifier having a main body case having a suction port and a discharge port, and an air passage extending from the suction port to the discharge port. A substantially spiral wind tunnel portion is formed near the discharge port of the air passage, a sirocco fan is provided in the wind tunnel portion, and a filter is provided in the middle of the air passage leading to the sirocco fan. A convex step for blocking reverse inflow from the outside is formed inside the side wall edge of the discharge port, and blowing air from the sirocco fan to the outside is provided between the convex step and the outer periphery of the end of the sirocco fan. A backflow space is provided to rewind and generate a backflow inside.

Therefore, in this case, the air flow from the sirocco fan is wrapped outward between the convex portion formed inside the side wall edge of the discharge port and the outer periphery of the end of the sirocco fan, thereby generating a backflow inside. Since the reverse flow space is provided, reverse flow of external air is prevented by the convex step. That is, in order to increase the trapping capacity of the filter, the pressure loss of the filter is inevitably increased. In such a case, even if the amount of air supplied to the sirocco fan is insufficient, the shortage is caused by the backflow. Because of the supplement, the backflow of external air is prevented.

[0008] Further, since the backflow is generated when the air blown from the sirocco fan is rewinded outward, there is almost no contact between the main flow discharged from the discharge port by the sirocco fan and the same backflow. Not
Noise is reduced. Further, the backflow is generated inside, and the backflow air has been already cleaned by the filter, and the uncleaned air is hardly discharged from the discharge port, and the filter is hardly discharged. The collection efficiency is improved. In addition, here, since the backflow of the external air is prevented, the flow of the air is large and smooth, and the dust and the odor contained in the air are effectively collected by the filter.

The air purifier according to a second aspect of the present invention is the air purifier according to the first aspect, characterized in that a partitioning piece for forming a backflow space is formed at the inner end of the protruding step. I have.

Therefore, in this case, in particular, since the backflow space is defined by the partitioning piece protruding from the inner end of the convex step, the main flow discharged from the discharge port by the sirocco fan is formed in the backflow space. The backflow is reliably generated without being affected, and the backflow is easily circulated to the sirocco fan, the air flow becomes smoother, and the collection efficiency by the filter is further improved. In addition, since the main flow and the backflow are separated by the partition pieces, contact between the two is reliably prevented, and noise is further reduced.

The air purifier according to a third aspect of the present invention is the air purifier according to the first aspect, wherein a protruding step is formed in a plate-like shape projecting obliquely inward from the discharge port toward the sirocco fan. Then, the outer space of the projecting step is opened to the outside of the discharge port so that air is blown and exhausted from the opening,
A backflow space is formed outside the blast exhaust flow between the outlet and the side wall of the discharge port.

Therefore, in this case, particularly, a projecting step is formed in a plate-like shape projecting inward from the discharge port toward the sirocco fan and inclined inward, and the outer space of the projecting step is open to the outside of the discharge port. Therefore, the purified air is blown and exhausted from the opening as the main stream. Therefore, the flow of air becomes larger, and the collection efficiency of the filter is further improved. In addition, since a backflow space is formed outside the main flow of the blown exhaust flow between the side wall of the discharge port and the backflow space, a backflow is generated in the backflow space while being suppressed by the main flow. Is reliably prevented from flowing back.

[0013]

1 to 4 show an embodiment corresponding to claim 1 of the present invention. An air cleaner according to this embodiment has a suction port 2 and a discharge port 3 in a main body case 1. And an air passage extending from the suction port 2 to the discharge port 3 is provided in the main body case 1, and a substantially spiral wind tunnel portion 4 is formed near the discharge port 3 in the air path. A sirocco fan 5 is provided in the section 4, and a filter 6 (a pre-filter 6 a and a main filter 6 b) is provided in the same air path to the sirocco fan 5. A protruding step 7 for blocking backflow from the outside is formed, and between the protruding step 7 and the outer periphery of the end of the sirocco fan 5, the blast from the sirocco fan 5 is wrapped to the outside so that the backflow b Is provided.

As shown in FIGS. 2 and 3, the main body case 1 has a box shape, and is formed by integrally connecting a front case 13 and a back case 14 to each other. The main body case 1 is opened at the lower front part of the front case 13, and the opening serves as the suction port 2, and the suction port 2 is also provided at the bottom of the back case 14. In the lower part of the body case 1, a pre-filter
6a, a discharge electrode block 15, and a main filter 6b for mechanically collecting dust are accommodated and installed in this order from the bottom.

In this case, the pre-filter 6a, the discharge electrode block 15, and the main filter 6b can be put in and taken out of the opening serving as the suction port 2, and a front cover for closing the opening is provided.
16 is attached so as to cover the front surface of the front case 13 of the main body case 1. Here, a ventilation louver portion 17 communicating with the opening serving as the suction port 2 is formed below the front lid cover 16. Similarly, the suction port 2 provided on the bottom portion of the back case 14 has a ventilation louver shape.

As shown in FIG. 4, wind tunnels 4 are disposed on both sides in the main body case 1, and a sirocco fan 5 is disposed in each of the wind tunnels 4. In this case, a drive motor 18 and a shaft 20 coupled and fixed to a rotating shaft of the drive motor 18 by a coupling 19 are provided as a blower for sending indoor air to the front case 13. An end of the coupling 20 opposite to the coupling 19 is rotatably supported and fixed by a bearing 21.

On the shaft 20, two sirocco fans 5 are provided, and a wind tunnel portion 4 is formed so as to surround each of the two sirocco fans 5. Here, the wind tunnel portion 4 has a substantially spiral shape, and a shape obtained by dividing the substantially spiral shape into front and rear portions is formed on the front case 13 and the rear case 14. The wind tunnel 4 is formed. 1 and 2, a discharge port 3 is formed on the upper surface of the back case 14 at a position parallel to the axis 20.
In this case, the discharge ports 3 are provided so as to correspond to both the sirocco fans 5.

Each of the discharge ports 3 is formed in the shape of a ventilation louver, and as shown in FIG. It is formed. The convex step 7 has a substantially rectangular cross section, is formed integrally with the back case 14 in which the discharge port 3 is formed, and is located so as to correspond to each of both ends of the sirocco fans 5. The lower surface of the stepped portion 7 is substantially parallel to the shaft 20, and between the lower surface and the outer periphery of the end of the sirocco fan 5 is sufficient to recirculate the blast from the sirocco fan 5 to the outside. A backflow space 8 having an appropriate interval is provided.

As shown in FIG. 2, the air flow in the air purifier of this embodiment is such that the external air flowing from the suction port 2 is supplied to the pre-filter 6a, the discharge electrode block 15, and the main filter.
After passing through 6b, the dust is removed and deodorized, and then passes through the wind tunnel 4 in which the sirocco fan 5 serving as a blower is accommodated, and is discharged from the discharge port 3. At this time, as shown in FIG. 1, the flow of the air flowing out of the discharge port 3 becomes the main flow a, and the back flow b is generated in the back flow space 8 on both sides of the main flow a.

Therefore, by installing and operating the air purifier of this embodiment in a room, it is possible to purify the air while circulating the air in the room. In this case, as shown in FIG. 1, the air from the sirocco fan 5 is blown outward between the convex step 7 formed on the inside of the rim of each side wall of the discharge port 3 and the outer periphery of both ends of the sirocco fan 5. Since the backflow space 8 for rewinding and generating the backflow b inside is provided,
The reverse inflow of external air is reliably prevented by the biconvex steps 7. That is, if the filter 6 (the pre-filter 6a and the main filter 6b) is attempted to increase the trapping ability, the pressure loss of the filter 6 is inevitably increased, and in such a case, the amount of air supplied to the sirocco fan 5 is reduced. Even if there is a shortage, the shortage is compensated by the backflow b, so that the backflow of the external air is prevented.

Further, since the backflow b is generated when the air blown from the sirocco fan 5 is returned to both outer sides, the backflow b is generated between the main flow a discharged from the discharge port 3 by the sirocco fan 5 and the same backflow b. However, they hardly come into contact with each other apart from each other, so that noise is reduced. The backflow b is generated inside the main body case 1, and the air that is the backflow b has already been cleaned by the filter 6, Air containing odor is hardly discharged, and the collection efficiency of the filter 6 is improved. In addition, here, since the backflow of the external air is prevented, the flow of the air is large and smooth, and the dust and odor contained in the air are effectively collected and removed by the filter 6. Is done.

FIG. 5 shows another embodiment corresponding to claims 1 and 2 of the present invention. In the air purifier of this embodiment, a backflow space 8 is defined at the inner end of the convex step 7. Partitioning pieces 9 are projected. In this case, the partition pieces 9 are provided on the projecting steps 7 on both sides, and extend in a thin plate shape from the inside edges along the inside edges of the steps 7. The projecting-side leading edge of the partition piece 9 is formed in a substantially arc shape along the outer periphery of the end of the sirocco fan 5 and is close to the outer periphery of the end.

Therefore, in the air purifier of the present embodiment, the backflow space 8 is defined by the partitioning pieces 9 protruding from the inner end of the protruding step portion 7. The backflow b is reliably generated without being affected by the main flow a discharged from the discharge port 3 by the fan 5. Therefore, the backflow b is a sirocco fan 5
And the air flow becomes smoother, and the collection efficiency by the filter 6 is further improved. In addition, since the main flow a and the backflow b are partitioned by the partition pieces 9, contact between the two is reliably prevented, and noise is further reduced. Except for this, the configuration is the same as that of the embodiment shown in FIGS. 1 to 4, and the same operation and effect as in the above-described embodiment are exerted.

FIG. 6 shows still another embodiment corresponding to claims 1 and 3 of the present invention. In the air purifier of this embodiment, the air purifier is inclined inward from the discharge port 3 toward the sirocco fan 5. A projecting step 7 is formed in the shape of a protruding plate, and an outer space 10 of the projecting step 7 is opened to the outside of the discharge port 3 so as to be blown and exhausted from the opening 11. Stream 12
A backflow space 8 is formed outside of the discharge port 3 with the side wall of the discharge port 3. In this case, the protruding steps 7 which are thin and inclined are provided on both sides of the discharge port 3, and the leading edge of the protruding side of each of the protruding steps 7 is formed in a substantially arc shape along the outer periphery of the end of the sirocco fan 5. And is located near the outer periphery of the end portion.
Therefore, the air blown from the vicinity of the end of the sirocco fan 5 is forcibly discharged as a part of the main flow a from the openings 11 on both side ends of the discharge port 3, and the reverse flow of the external air from the discharge port 3 is performed. Is reliably prevented.

Therefore, in the air purifier of the present embodiment, the protruding step 7 is formed in a plate-like shape projecting obliquely inward from the discharge port 3 toward the sirocco fan 5, and outside the protruding step 7. Since the space 10 is opened to the outside of the discharge port 3, the purified air is blown and exhausted from the opening 11 as a part of the main stream a. Therefore, the flow of air becomes larger, and the collection efficiency of the filter 6 is further improved. In addition, the blast exhaust flow 12 which is a part of the main flow a
A backflow space 8 is formed between the side wall of the discharge port 3 and the outside, so that in the backflow space 8, a backflow b is generated by being surely rewound while being suppressed by the main flow a, and thereby, Backflow of the external air is reliably prevented. Except for this, the configuration is the same as that of the embodiment shown in FIGS. 1 to 4, and the same operation and effect as in the above-described embodiment are exerted.

[0026]

As described above, in the air purifier according to the first aspect of the present invention, the reverse inflow of external air is prevented by the convex portion, and the reverse flow wrapped outward and the sirocco fan cause the air to flow out of the discharge port. There is almost no contact with the discharged main stream, noise is reduced, and the air that is generated inside and flows backward has already been cleaned by a filter, and uncleaned air is discharged from the discharge port. Is almost eliminated, and the collection efficiency by the filter is improved.

[0027] In the air purifier according to the second aspect of the present invention, in particular, in the backflow space defined by the partition pieces, the backflow is not affected by the main flow discharged from the discharge port by the sirocco fan. It is reliably generated, the air flow becomes smoother, the collection efficiency by the filter is further improved, and the contact between the main flow and the backflow is reliably prevented, and the noise is further reduced.

In the air purifier according to the third aspect of the present invention, in particular, the air that is guided by the inclined plate-shaped convex step portion and the purified air is blown and exhausted from the outer space as the main flow. In addition, the flow of air becomes larger, the collection efficiency by the filter is further improved, and in the backflow space, backflow is generated while being suppressed by the same main flow, and the backflow of external air is reliably prevented. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part of an air purifier according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing the entire air purifier in different directions.

FIG. 3 is an exploded perspective view showing the entire air purifier.

FIG. 4 is a cross-sectional view showing the entire air purifier.

FIG. 5 is a longitudinal sectional view showing a main part of an air cleaner according to another embodiment.

FIG. 6 is a longitudinal sectional view showing a main part of an air cleaner according to still another embodiment.

FIG. 7 is a longitudinal sectional view showing a main part of an air purifier as a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body case 2 Suction port 3 Discharge port 4 Air tunnel 5 Sirocco fan 6 Filter 6a Pre-filter 6b Main filter 7 Convex step 8 Backflow space 9 Partition piece 10 Outer space 11 Opening 12 Ventilation exhaust flow

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B116 AA47 AB53 BB21 BB87 3H034 AA02 AA18 BB06 BB19 CC03 CC05 CC07 DD12 EE06 EE08 EE18 3H035 DD04 4D058 QA01 QA05 QA11 QA17 QA21 QA27 SA01 UA18 UA25

Claims (3)

[Claims] An air inlet and a discharge outlet are formed in a main body case, and an air passage extending from the air inlet to the discharge outlet is provided in the main body case. An air purifier in which a wind tunnel is formed, a sirocco fan is provided in the wind tunnel, and a filter is provided in the middle of the air passage to the sirocco fan. Air having a convex portion for blocking air flow, and providing a backflow space between the convex portion and the outer periphery of the end of the sirocco fan for returning the air from the sirocco fan to the outside and generating a backflow inside the sirocco fan. Purifier. 2. The air purifier according to claim 1, wherein a partitioning piece for forming a backflow space is protruded from an inner end of the convex step. 3. A projecting portion is formed in a plate-like shape projecting obliquely inward from the discharge port toward the sirocco fan, and an outer space of the projecting step portion is opened to the outside of the discharge port, and from the opening. 2. The air purifier according to claim 1, wherein the air is exhausted and a backflow space is formed outside the airflow and between the side wall of the discharge port.