JP2001012394A - Electric fan and electric cleaner using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the air amount exhausted to the outside of a machine by a simple constitution while restraining the temperature increase of the air circulated without using a wet and dry motor. SOLUTION: A communication passage 19 for communicating with a circulation return passage 7 is formed on the bottom side of a main body case 11. A large diameter buffer is provided on the periphery end of a fan cover 29 and a small diameter buffer on the periphery end of the suction port 42 of the fan cover 29, respectively, and a circulation air take out room 40 communicating with the communication passage 19 is formed by contacting them to a support member 41. Further, an air introduction port 31 for circulation is formed on the part of the fan cover 29 contacting to the circulation air take out room 40 and one part of the air from a centrifugal fan 27 is discharged so as to be circulated through a suction tool 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower in which a part of intake air is returned to an intake destination of a suction portion so that the amount of air exhausted outside the apparatus can be reduced, and an electric blower using the same. About vacuum cleaner.

[0002]

2. Description of the Related Art Generally, a dust collector bag and an electric blower are provided inside a main body of a vacuum cleaner, and a hose or the like to which a floor suction tool is attached is inserted. Then, the suction force generated by the rotation of the electric blower sucks air through the floor suction tool, and at this time, dust under the floor suction tool is drawn into the air and sucked, thereby performing cleaning. It has become.

[0003] The air sucked in at this time is exhausted to the outside of the machine. At that time, the air is blown while cooling the electric blower.

[0004] However, if all the air taken in is exhausted, the momentum and the amount of the exhausted air are large, so that the exhausted wind causes the dust stagnating on the floor or carpet to fly up and spread throughout the room. Failure occurs.

[0005] Therefore, after cooling the electric blower, a part of the air exhausted to the outside of the air blower is returned to the floor suction device. There has been proposed a so-called exhaust gas recirculation type vacuum cleaner in which dust returned under the floor suction tool is agitated by the air returned to the floor suction tool to efficiently collect dust.

At this time, a hose or the like for connecting the floor suction tool and the main body case is formed in a double pipe structure, the inside of which forms an intake passage through which air accompanying dust is sucked, and the outside is the floor suction suction. There is a circulation return path in which air returning to the tool flows.

[0007]

However, as described above, in the structure in which part of the air used for cooling the electric blower is circulated to the floor suction device, at least a wind for guiding the air to the circulation return path is provided. The road must be formed around the electric blower, and there is a problem that the main body becomes large.

Further, if the air returning to the floor suction tool is air after cooling the electric blower, the temperature of the air gradually increases during repeated circulation, causing the following problem.

That is, since the hose and the like are parts that the user often touches, when the temperature of the circulating air becomes high, the hose or the like becomes hot, causing the user to feel uncomfortable or abnormal, However, there is a problem that the heat resistance performance is reduced and the life is shortened because the material is used as a material.

Further, the air returned to the floor suction tool is sucked again through the intake passage and used for cooling the electric blower, so that the temperature of the cooling air rises and the cooling efficiency of the electric blower decreases. There is a problem.

In this case, it is conceivable to cope with the situation by using a so-called WET & DRY motor. In the WET & DRY motor, fans are provided at both ends of the motor shaft, and one fan sucks dust-containing air (which may contain moisture) and the other fan sucks motor cooling air. Then, the motor is cooled.

Therefore, it is possible to circulate all the sucked air and prevent the air from being exhausted to the outside of the machine. However, in such a case, the structure of the motor becomes complicated and the size of the main body of the vacuum cleaner becomes large, resulting in cost reduction. There is a problem that leads to high.

Accordingly, the present invention provides an electric blower and a vacuum cleaner using the same, which can reduce the amount of air exhausted outside the machine while suppressing the temperature rise of circulating air with a simple configuration without using a WET & DRY motor. The purpose is to provide.

[0014]

According to a first aspect of the present invention, a fan cover is mounted on the windward side so as to cover a centrifugal fan mounted on a motor. In the electric blower provided with a diffuser that changes the air path so that the air discharged from the centrifugal fan flows to the motor side, a part of the air discharged from the centrifugal fan on the fan cover is located on the windward side. Wet & DR with circulating air outlet
It is characterized in that the amount of air exhausted outside the apparatus is reduced while suppressing the temperature rise of circulating air with a simple configuration without using a Y motor.

The invention according to claim 2 is characterized in that a plurality of circulating air ports are formed radially.

According to a third aspect of the present invention, a fan cover is provided with a buffer member for absorbing vibration of the electric blower, and a space surrounded by the fan cover and the buffer member is used as a circulating air extracting chamber, and communicates with the circulating air extracting chamber. And a circulating air port is provided.

According to a fourth aspect of the present invention, the cushioning member has a large-diameter cushioning member attached to a peripheral end of the fan cover and a suction port provided at the center of the fan cover and through which air to be sucked flows. It is characterized by being formed by a small-diameter cushioning material attached to the peripheral end.

According to a fifth aspect of the present invention, an electric blower is housed in a main body case, and an intake passage through which air containing dust passes through the main body case and a circulation return passage through which at least a portion of air from the electric blower passes. Attach the provided suction part,
Also, by forming a communication passage in the main body case that connects the circulating air extraction chamber and the circulating return passage, the amount of air exhausted outside the machine is reduced while suppressing the temperature rise of the circulating air with a simple configuration. It is characterized by.

The invention according to claim 6 is characterized in that the communication passage is formed on the windward side of the electric blower and on the bottom side of the main body case.

The invention according to claim 7 is characterized in that the circulating air extraction chamber and the communication passage are communicated at one location on the bottom side of the main body case.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of a vacuum cleaner applied to the description of the present embodiment, and FIG. 2 is an enlarged sectional view of a main body.

The main part of the vacuum cleaner is a main body 10 in which an electric blower 13 and a dust bag 12 are stored in a main body case 11, and a suction unit 2 detachably provided in the main body 10.

The suction section 2 is composed of a hose 3, a connecting pipe 4, a floor suction tool 5, and the like. These are formed in a double-pipe structure, and an inner passage is used to suck dust into the main body 10. An intake passage 6 serving as a flow passage is provided, and an outer passage serves as a circulation return passage 7 serving as a flow passage of air returned from the main body 10 to the floor suction tool 5.

As described above, the main body case 11 is provided with the motor room 14 in which the electric blower 13 is housed and the dust collecting room 15 in which the dust bag 12 is housed. Between the fine dust filter 16 and the support member 41.
Is provided.

The support member 41 is composed of a grid 42 and a support plate 43. The grid 42 regulates the fine dust filter 16 from being sucked into the electric blower 13 when air is sucked.

The support plate 43 is provided with a vent hole 34 at the center thereof, and the electric blower 34 rotates to rotate the electric blower 13 so that air sucked by the electric blower 13 always passes through the fine dust filter 16. It is in contact with a buffer member 35 provided on the head of the blower 13. The buffer member 35 will be described later.

A hose insertion port 17 to which the hose 3 is attached is provided at the front of the dust collecting chamber 15 (the side opposite to the motor chamber 14), and the rear side of the motor chamber 14 (the side opposite to the dust collecting chamber 15). Is provided with an exhaust port 18 for exhausting air out of the machine.

Further, a communication path 19 for returning a part of the air discharged from the electric blower 13 to the suction section 2 is formed below the dust collecting chamber 15.

FIG. 3 is a partially broken side view of the electric blower 13. As can be seen from this figure, the electric blower 13 has a motor 20, which is housed in a motor housing 21, which forms the exterior of the motor 20.

The motor housing 21 includes a substantially cylindrical bracket 22 having one end opened, and a frame 23 provided so as to close the opening of the bracket 22. Are inserted and the frame 23 is covered.

A ring-shaped flange 25 is formed at the end of the opening of the bracket 22 so as to expand in the radial direction, and the frame 23 is screwed to the flange 25.

A centrifugal fan 27 is mounted on the motor shaft 26. A diffuser 28 is provided between the centrifugal fan 27 and the frame 23 for guiding the air discharged from the centrifugal fan 27 to the motor 20 side. A fan cover 29 is provided so as to cover the centrifugal fan 27, and a buffer member 35 is attached to the fan cover 29.

A cooling exhaust air inlet 30 is formed in the frame 23 for guiding the air discharged from the centrifugal fan 27 and whose flow path is bent by the diffuser 28 to the inside of the peripheral wall of the bracket 22. Rotor 3
2 and the stator 24 are air-cooled,
The air flows out of the bracket 22 from a bracket exhaust port 33 provided on the peripheral wall of the bracket and is exhausted from the exhaust port 18 to the outside of the machine.

FIG. 4 is a view showing the structure of the fan cover 29, FIG. 4 (a) is a top view thereof, and FIG. 4 (b) is a sectional view.

As can be seen from FIG.
An intake port 42 through which air is sucked is provided at the center of 9.
A plurality of circulating air inlets 31 from which a part of the air from the centrifugal fan 27 is discharged are radially formed in the peripheral inclined portion.

As shown in FIG. 3 and the like, a large-diameter cushioning material 36 is inserted into the peripheral end of the fan cover 29, and a small-diameter cushioning material 37 is attached to the peripheral end of the intake port 42. The large-diameter cushioning material 36 and the small-diameter cushioning material 37 constitute a cushioning member 35.

The cushioning member 35 has a vibration absorbing function for preventing the vibration and the like of the electric blower 13 from being transmitted directly to the main body case 11, and its material and a method of mounting the small-diameter cushioning material 37 are known. However, these are not limited as long as they can be handled by the technology described above.

As shown in FIG. 2 and the like, the cushioning member 35 comes into contact with the support plate 43, whereby an annular space is formed by the fan cover 29, the cushioning member 35, and the support plate 43. , The space forms a circulating air extraction chamber 40.

The circulating air outlet chamber 40 communicates with the circulating air inlet 31 and the communication passage 19, so that the air discharged from each circulating air inlet 31 can be circulated with the circulating air. It gathers in the chamber 40 and circulates to the suction part 2 through the communication passage 19.

With such a configuration, when the electric blower 13 is driven, the centrifugal fan 27 rotates, and the air containing dust enters the dust collecting chamber 15 from the floor suction tool 5 through the intake passage 6, Breathable dust collection bag 1 provided in the dust collection chamber 15
Pass 2

The dust is collected by the dust collecting bag and the fine dust filter 1.
6 and flows into the fan cover 29 from the intake port 42.

The air that has flowed into the fan cover 29 is radially discharged by the centrifugal fan 27, a part of the air is changed in flow path to the motor 20 side by the diffuser 28, and the air is supplied from the cooling exhaust air inlet 30 to the bracket 30. It flows into 22. On the other hand, the remaining air flows out of the circulation air inlet 31 into the circulation air extraction chamber 40.

The air that has flowed into the bracket 22 cools the rotor 32 and the like of the motor 20, and then is discharged from the bracket exhaust port 33 to the outside of the electric blower 13.
The air is exhausted from the exhaust port 18 provided outside the apparatus.

On the other hand, the air flowing into the circulating air outlet chamber 40 from the circulating air inlet 31 is
From the suction pipe 5 through the communication pipe 19 and the circulation return path 7 for the connecting pipe 4 and the hose 3.

The air returned to the floor suction device 5 blows up the dust deposited on the floor, carpet and the like under the floor suction device 5 so that the dust can be efficiently sucked and the air is sucked together with the dust. The cycle described above is repeated via the flow path 6.

As described above, the fan cover 29 and the cushioning member 3
Since the space formed between the support 5 and the support plate 43 is used as the circulating air extracting chamber 40, the air can be easily circulated only by forming the circulating air inlet 31 in the fan cover 29. And the circulating air outlet chamber 40 is formed in a substantially annular shape.
1 can also be arranged in a ring shape, and can be easily connected to the communication passage 19, so that an efficient circulation air extraction structure can be easily formed.

Since the communication path 19 does not have to be provided around the electric blower 13, the position of the electric blower 13 can be lowered as compared with the case where the communication path 19 is provided around the electric blower 13. The center of gravity is lowered, the stability is increased, and the size of the main body 10 can be reduced.

The air circulating to the floor suction tool 5 through the circulation return path 7 is not used for cooling the motor 20.
The temperature of the hose 3, the connecting pipe 4, etc., which the user often touches, increases, so that the user does not feel uncomfortable or abnormal, and the resin members do not deteriorate due to heat.

Further, since the temperature of the air for cooling the electric blower 13 does not increase, the cooling efficiency of the electric blower 13 can be prevented from lowering.

In the above description, the circulation air inlet 3
Although 1 is formed on the peripheral inclined portion of the fan cover 29, the present invention is not limited to this, and may be formed at least on the support plate 43 side of the fan cover 29.

For example, in FIGS.
9 shows a configuration example in the case where a circulating air inlet 31 is formed in the vicinity of the end portion 9. FIG. 5 corresponds to FIG.
3 corresponds to FIG. 3, and FIG. 7 corresponds to FIG.

In this case, if the large-diameter cushioning material 36 is directly inserted into the fan cover 29, the circulation air introduction port 31 may be blocked, so the large-diameter cushioning material insertion pipe 38 is attached to the fan cover 29. The large-diameter cushioning material 36 is inserted into the large-diameter cushioning material insertion tube 38.

As a result, the circulating air outlet chamber 40 is formed by the fan cover 29, the buffer member 35, and the support plate 43, and the circulating air outlet chamber 40 communicates with the circulating air inlet 31 and the communication passage 19. It is possible to obtain the effect as described above.

In particular, in this configuration, the air discharged from the centrifugal fan 27 is less circulated than in the case where the circulating air inlet 31 is formed in the inclined portion of the fan cover 29 described above with reference to FIGS. Since the resistance when flowing to the circulating air extraction chamber 40 via the air inlet 31 can be reduced, it is possible to efficiently circulate the air.

That is, in the case of the configuration shown in FIGS.
Since the step portion 39 between the centrifugal fan 27 and the fan cover 29 is narrow (see FIG. 3), the air passing therethrough receives a large resistance. However, in the configurations shown in FIGS. Therefore, the resistance received by the air is reduced, and accordingly, the opening area of the circulation air inlet 31 can be reduced.

[0056]

As described above, according to the first aspect of the present invention, the circulating air port for discharging a part of the air discharged from the centrifugal fan to the windward side is provided in the fan cover.
The amount of air exhausted outside the apparatus can be reduced with a simple configuration while suppressing the temperature rise of the circulating air without using a WET & DRY motor.

According to the second aspect of the present invention, since a plurality of circulating air ports are formed radially, it is possible to efficiently reduce the amount of air exhausted outside the apparatus.

According to the third aspect of the present invention, the fan cover is provided with a cushioning member for absorbing vibration of the electric blower,
The space surrounded by the fan cover and the buffer member is a circulating air extraction chamber, and a circulating air port is provided so as to communicate with the circulating air extraction chamber. It is possible to reduce it.

According to the fourth aspect of the present invention, the cushioning member is provided with a large-diameter cushioning member attached to the peripheral end of the fan cover,
Since it is formed by the small-diameter cushioning material provided at the peripheral end of the air inlet provided at the center of the fan cover and through which the air to be sucked flows, the air extraction chamber can be easily formed, and a simple configuration Thus, it is possible to efficiently reduce the amount of air exhausted outside the apparatus.

According to the fifth aspect of the present invention, since the communication path for communicating the circulating air extraction chamber and the circulation return path is formed in the main body case, the WET & DR is small and has a simple configuration.
While suppressing the temperature rise of the circulating air without using a Y motor, the amount of air exhausted outside the machine can be reduced, the center of gravity of the main body is lowered, the stability is improved, and the main body is improved. Can be reduced in size.

According to the sixth aspect of the present invention, since the communication passage is formed on the windward side of the electric blower and on the bottom side of the main body case, the WET & DRY has a small and simple structure.
While suppressing the temperature rise of the circulating air without using a motor, the amount of air exhausted outside the machine can be reduced, and the center of gravity of the main body is lowered, stability is improved, and the The size can be reduced.

According to the seventh aspect of the present invention, the circulating air extraction chamber and the communication passage communicate with each other at one location on the bottom side of the main body case.
While suppressing the temperature rise of the circulating air without using a T & DRY motor, the amount of air exhausted outside the machine can be reduced, the center of gravity of the main body is lowered, the stability is improved, and the main body is improved. Can be reduced in size.

[Brief description of the drawings]

FIG. 1 is a sectional configuration view of a vacuum cleaner applied to the description of an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional configuration diagram of a main body.

FIG. 3 is a side view of a partial judgment of the electric blower.

FIG. 4 is a configuration diagram of a fan cover.

FIG. 5 is a partial judgment side view of an electric blower having another configuration in place of FIG. 3;

FIG. 6 is a partial judgment side view of an electric blower having another configuration in place of FIG. 4;

FIG. 7 is a configuration diagram of a fan cover replacing the configuration of FIG. 5 with another configuration.

[Explanation of symbols]

 2 Suction unit 5 Floor suction tool 6 Intake flow path 7 Circulation return path 10 Main unit 11 Main case 12 Dust collection bag 13 Electric blower 19 Communication passage 20 Motor 21 Motor housing 27 Centrifugal fan 29 Fan cover 30 Cooling / exhaust air inlet 31 Circulating air inlet 35 Buffer member 36 Large buffer material 37 Small buffer material 38 Large buffer material insertion tube 40 Circulating air extraction chamber 41 Support member 43 Support plate

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) A47L 9/28 A47L 9/28 Z F04D 29/58 F04D 29/58 S

Claims (7)

[Claims] A fan cover is mounted on the windward side to cover a centrifugal fan mounted on a motor, and air discharged from the centrifugal fan flows between the motor and the centrifugal fan toward the motor. Electric blower provided with a diffuser for changing the air path as described above, wherein the fan cover is provided with a circulating air port for discharging a part of the air discharged from the centrifugal fan to the windward side. . 2. The electric blower according to claim 1, wherein a plurality of the circulating air ports are formed radially. 3. The fan cover is provided with a cushioning member for absorbing vibration of the electric blower, and a space surrounded by the fan cover and the cushioning member is a circulating air extraction chamber, and communicates with the circulating air extraction chamber. The electric blower according to claim 1, wherein the circulating air port is provided in the air blower. 4. A large-diameter cushioning member attached to a peripheral end of the fan cover and a peripheral end of an intake port provided at the center of the fan cover and through which air to be sucked flows. The electric blower according to claim 3, wherein the blower is formed by a small-diameter buffer material attached. 5. A suction section for accommodating the electric blower in a main body case and having a suction passage through which air containing dust passes through the main body case and a circulation return path through which at least a part of air from the electric blower passes. And a communication passage for connecting the circulating air extraction chamber and the circulation return passage is formed in the main body case.
An electric vacuum cleaner using the electric blower according to any one of the preceding claims. 6. The vacuum cleaner according to claim 5, wherein the communication path is formed on the windward side of the electric blower and on a bottom side of the main body case. 7. The circulating air extraction chamber and the communication passage,
The vacuum cleaner according to claim 6, wherein the vacuum cleaner is communicated at one location on the bottom side of the main body case.