JP3532779B2 - Fan motor device and recirculating vacuum cleaner - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a fan motor device for a vacuum cleaner and a recirculation vacuum cleaner.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional fan motor device for an electric vacuum cleaner. This conventional fan motor device is called a direct type, and has a motor case 101 including a rotor 102 and a stator 103 that form a motor.
The device case 100 is configured by integrally forming a fan case 104 that covers the power fan 105 fixed to the rotary shaft 102a of the rotor 102.

The rotor 10 is energized by the motor.
When the power fan 105 rotates by the rotation of 2, the external air Q ₀ is sucked into the fan case 104 through the suction port 106 and is accelerated and pressurized by the rotation and centrifugal force of the power fan 105 in the fan case 104. It Then, after being accelerated and pressurized, the rotor 102 and the stator 1 generate cooling air flow q ₀ from the outer peripheral portion of the power fan 105.
It is pressure-fed to the passage 107 between 03. Then, this cooling air flow q ₀ is discharged to the outside of the motor case 101 through the air outlet 108 opened in the motor case 101 (Q ₂ ).

The fan motor device for an electric vacuum cleaner disclosed in Japanese Patent Application Laid-Open No. 9-98913 is called a bypass type fan motor device and is shown in FIG. A motor case 111 having a rotor 112 and a stator 113 that constitute a motor is integrally formed with a fan case 114 to form an apparatus case 110, and a cold air intake port 115 is opened at an end of the motor case 111. In addition, a motor discharge port 116 is provided on the side wall of the root of the fan case 114, while a suction port 117 is provided at the end of the fan case 114 and a blower port 118 is provided at the outer peripheral portion.

A partition plate 119 partitions the space between the cases 111 and 114, and a cooling fan 120 is fixed to the rotary shaft 112a in the motor case 111 in the vicinity of the partition plate 119. In the fan case 114, the power fan 121 is fixedly provided to the rotating shaft 112a.

[0006] Then, the rotor 11 by energizing the motor
When the power fan 121 rotates by two rotations, the external air Q ₀ is sucked into the fan case 114 through the suction port 117 and is accelerated and pressurized by the rotation and centrifugal force of the power fan 121 in the fan case 114. From the outer peripheral portion of the power fan 121, the air outlet 118 is provided as the work flow Q _2.
Released more.

On the other hand, by the rotation of the cooling fan 120, the external air Q ₁ is supplied from the cool air intake port 115 to the motor case 111.
The passage 1 between the rotor 112 and the stator 113 that is sucked into
22 passes while cooling the motor as the cooling flow is discharged from the motor outlet 116 to the outside motor case 111 through the cooling fan 120 while being cut off from the work flow Q ₂ (Q _3).

[0008]

In the above conventional direct type fan motor device, the temperature of the exhaust gas discharged from the air outlet 108 becomes high because the air is sucked in to cool the motor. The higher the temperature, the higher it will be. For this reason, when used in a recirculation type vacuum cleaner that recirculates exhaust gas, there is a problem that the temperature of the motor easily rises, the performance of the motor deteriorates, and eventually a failure occurs.

Further, in the bypass type fan motor device, since the work flow and the cooling flow are completely cut off, the temperature rise of the cooling flow can be prevented. However, in the fan motor device, the power fan 121 is large and the cooling fan 120 is small in order to obtain a small dust collecting force. For this reason, the cooling air volume is small, and the motor cooling effect is smaller than that of the direct type fan motor device. Therefore, similarly, there is a problem that the temperature of the motor rises and the performance of the motor and the life of the motor are reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fan motor device and a recirculation electric vacuum cleaner which can increase the cooling effect of the motor and reduce the failure of the motor with a simple structure.

[0011]

[0012]

[0013]

[0014]

[0015]

[0016]

A recirculation type vacuum cleaner according to the present invention has a motor case which has a cool air intake port and a motor exhaust port and covers a motor and a cooling fan rotated by the driving of the motor, and a suction port. A fan case that has a blower opening and covers a power fan that is rotated by the drive of the motor is integrated via a partition plate, and the suction airflow from the suction port causes the power fan to rotate by the rotation of the power fan. through a first air flow path is exhausted from the blower opening to, the suction airflow from the cold air suction port by rotation of the cooling fan wherein
For the rectifying frame plate that is closed between the inner wall of the motor case
The cooling that is sucked and provided on the straightening frame plate
A second air flow path that is exhausted from the motor exhaust port through the cooling fan from a ventilation hole that is slightly smaller in diameter than the outer diameter of the fan, and a communication port through which a part of the suction airflow from the suction port is provided in the partition plate. A fan motor device having a third air flow passage that merges with the second air flow passage through the main body, a main body having a fan motor chamber that houses the fan motor device, and a dust collection chamber that communicates with the fan motor chamber; It is characterized in that it has a nozzle body attached to the main body and a lower part and having a dust suction port on the lower surface, and a return passage for guiding the exhaust gas of the first air flow passage to the dust suction port and blowing it to the floor surface.

According to this structure, the motor is driven and the power fan rotates, so that the intake air is taken in through the dust suction port and reaches the fan motor chamber through the suction side flow path and the dust collection chamber. First taken into the motor unit
It is exhausted from the blower port through the air flow path, is guided to the dust suction port through the ring flow path, and is blown onto the floor surface. Simultaneously with the rotation of the cooling fan, the intake air is taken into the fan motor device from the cool air intake port and exhausted from the motor exhaust port through the second air flow path. Then, a part of the air in the first air flow path enters the motor case through the communication port, this flows in the motor case together with the air flow in the second air flow path, and while passing through while cooling the motor, from the motor exhaust port. It is released to the outside.

Further, the communication port is characterized in that provided at the farthest position with respect to the cold air inlet.

[0019] and is characterized by comprising a plurality of said communication port.

[0020]

[0021]

[0022]

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a fan motor device according to the present invention will be described in detail below with reference to the drawings. 1 and 2 are a sectional view and an exploded perspective view showing an embodiment of a fan motor device according to the present invention. In these drawings, reference numeral 1 denotes a device case of a fan motor device, which is composed of a motor case 2 and a fan case 3.

The motor case 2 is formed by molding a metal material by die-molding, punching, drawing, etc., and connects the main body 2a having a bottomed cylindrical shape and the open end of the main body 2a in the radial direction. And a portion 2b. A pipe-shaped cold air intake port 2c is provided at one location on the outer peripheral edge of the connection part 2b, and the cold air intake port 2c at the closed end of the main body part 2a is provided.
A motor exhaust port 2d is provided at a position opposite to the position.

Inside the motor case 2, a rotary shaft 4 rotatably penetrating the center of the closed end of the motor case 2 and having a rotor 5 and a cooling fan 7 fixedly mounted on the shaft is provided laterally. Together with the rotor 5, a constant gap, that is, the passage 8
The stator 6 is fixedly provided on the inner wall of the main body 2a so as to maintain the above.

The cooling fan 7 includes a circular plate 7a and a circular plate 7
a, a plurality of blade pieces 7c arranged at equal intervals along the circumferential direction on the outer peripheral portion of the plate surface on the opening side of the motor case 2.
.. and consist of The circular plate 7a has a through hole 7b at its center for inserting and fixing the circular plate 7a.

The fan case 3 is formed of a metal material into a dish shape by die molding, punching and drawing, and the outer diameter of the connecting portion 3a is substantially the same as the end surface of the connecting portion 2b of the motor case 2. The diameter is the same and a suction port 3b is opened at the center of the bottom. The blower pipe 3c (blast port) is provided at one location on the outer peripheral edge of the connecting portion 3a, and the connecting portion 3a is press-fitted to the connecting portion 2b of the motor case 2, whereby the motor case 2 and the fan case 3 are integrated. It is adapted to form the device case 1.

Inside the fan case 3, a power fan 9 fixed to the tip of a rotary shaft 4 with a nut 10 is rotatably provided. The power fan 9 includes a circular plate 9a having an insertion hole 9b through which the rotary shaft 4 penetrates, and the circular plate 9a.
a. A plurality of blades 9c radially arranged at equal intervals in the circumferential direction on the surface of the motor casing 3 on the side of a.
And a dish-shaped cover 9 that covers the outer edges of these blades 9c
and d. As shown in FIG. 1, the cross section is generally formed in an umbrella shape. An opening 9e having substantially the same diameter as that of the suction port 3b is provided at the center of the cover 9d, and the air taken in through the opening 9e is guided to the outer periphery through the flow passage 9f between the cover 9d and each blade 9c. .

The motor case 2 and the fan case 3 are formed as described above, but in the present invention, in addition to the above structure, a partition plate 11 for partitioning the two is provided at the boundary between the connecting portions of both cases. . As shown in FIG. 3, the partition plate 11 is made of a circular plate material and has an insertion hole 11a through which the rotary shaft 4 penetrates at the center of the plate surface.

The outer peripheral portion of the motor case 2 opposite to the side having the cool air intake port 2c, that is, the farthest position from the cool air intake port 2c, is located 3 along the outer peripheral direction of the partition plate 11.
The individual communication ports 11b, 11c and 11d are provided at equal intervals. In the present embodiment, as shown in the figure, the central communication port 11b among these communication ports is the other communication ports 11c and 11d.
Although the diameter is larger than that of the above, the number of the communication ports and the size of the diameter can be appropriately changed depending on the performance of the motor and the like.

Further, a rectifying frame plate 11e is fixed to the partition plate 11 at the center of the plate surface on the motor case 2 side. The rectifying frame plate 11e is, for example, a metal plate formed into a circular dish-shaped body, and a mounting flange 11f is provided on the outer periphery of one end face to fix the rectifying frame plate 11e to the partition plate 11 and the other end face. A ventilation hole 11g having a diameter slightly smaller than the outer diameter of the cooling fan 7 is provided at the center of the. Cold air intake port 2 on the outer peripheral side wall of the flow regulating frame plate 11e
At a position closest to c, a cold air intake port 11h is provided on a substantially collinear line facing the cold air intake port 2c.

The rectifying frame plate 11e and the motor case 2
The inner wall is closed with a closing portion 2f. Therefore,
The intake air from the cool air intake port 2c is introduced into the motor case 2 through the inside of the rectifying frame plate 11e.

In the fan motor device configured as described above, when the motor portion comprising the rotor 5 and the stator 6 is energized to rotate the rotor 5, the cooling fan 7 and the power fan 9 are accordingly driven. Rotate. The rotation of the power fan 9 generates a suction force in the fan case 3,
External air Q ₀ is sucked into the fan case 3 through the suction port 3b, is accelerated and pressurized by the power fan 9 in the fan case 3, and is again discharged to the outside of the fan case 3 from the blower pipe 3c (this air flow). The first air flow path X
That).

On the other hand, since the suction force is generated in the motor case 2 by the rotation of the cooling fan 7, the external air Q1 is sucked into the straightening frame plate 11e from the cold air intake port 2c through the cold air intake port 11h, and at the same time, the straightening frame plate is also drawn. It is sent into the motor case 2 from the ventilation hole 11g of 11e, and then,
After swirling the cooling fan 7, while cooling the motor, it passes through the passage 8 between the rotor 5 and the stator 6 and is discharged from the motor exhaust port 2d to the outside of the motor case 2 (this air passage is 2 air flow path Y).

A part of the air sucked into the fan case 3 as the power fan 9 rotates is accelerated and pressurized as described above, and then the communication ports 11b and 11 of the partition plate 11 are connected.
It is sent into the motor case 2 through c and 11d,
After that, it passes through the inside of the connecting portion 2b of the motor case 2 and the passage 8 together with the second air flow path Y, and the motor exhaust port 2d
Is discharged to the outside of the motor case 2 (this air passage is
Air flow path Z). The air flow in the third air flow path Z is also used as the cooling air for the motor. However, the air flow in the second air flow path Y can be supplemented with the insufficient cooling air flow, and both air flows can be co-flowed to enhance the cooling effect of the motor. it can.

Next, an embodiment of a reflux type electric vacuum cleaner equipped with the above fan motor device will be described in detail with reference to the drawings. FIG. 4 is a perspective view of a reflux type electric vacuum cleaner according to the present invention,
FIG. 5 is a side sectional view of the vacuum cleaner, and FIG. 6 is a front sectional view of a main part of the vacuum cleaner. In these drawings, the reflux type vacuum cleaner has a main body 12 including a hollow body having a substantially quadrilateral cross section and having a cross-sectional area gradually decreasing from a lower portion to an upper portion, and a main body 12 of the body 12. The nozzle body 13 is provided in the lower portion, and the handle body 14 is provided in the upper portion of the main body 12 and is formed by the user so as to be gradually tapered from the lower portion to the upper portion.

The main body 12 has a partition wall 1 inside.
It is divided into upper and lower parts by 2a, and is divided into a fan motor chamber 12b which can be opened and closed by a cover body 12d and a dust collection chamber 12c which can be opened and closed by a lid body 12e. The lower fan motor chamber 12b is approximately 1/100 of the whole from the right inner wall in the lateral direction.
3 A partition wall 12f and a support rib 1 extending vertically at a position closer to the center and a position further closer to the left inner wall about 1/3
2 g is formed (see FIG. 6).

The partition wall 12f is inserted and supported in the support hole 12h through a vibration isolation ring 25 so that the substantially central portion of the motor case 2 of the fan motor device is inserted without air leakage. The upper and lower support ribs 12g, 12g support the fan case 3 via the vibration isolation members 26, 26 so as to prevent air leakage.
As a result, the fan motor device is housed in the fan motor chamber 12b such that the rotary shaft 4 is parallel to the partition wall 12a and can absorb vibration. Then, the fan motor chamber 12 is formed by the partition wall 12f, the supporting ribs 12g, and the like.
The inside of b is divided into a work flow chamber 12w, a cooling flow chamber 12u, and an exhaust flow chamber 12v.

Further, the fan motor chamber 12b is provided with bosses 12k, 12 on both outer wall surfaces of the fan motor device in the direction of the rotating shaft 4 direction.
k is provided, and the end of the rotary shaft 4 is projected from the one boss 12k to the outside of the fan motor chamber 12b. On the bottom surface of the fan motor chamber 12b, a cool air inlet 12j facing the cool air intake port 2c of the fan motor device and a blower pipe 3c.
And an insertion opening 12m through which the exhaust gas is exhausted from the motor exhaust opening 2d of the fan motor device (second and third).
An exhaust port 12n for discharging the air flow paths Y, Z) from the fan motor chamber 12b is opened.

Reference numeral 27 is a vibration damping member for supporting the end portion of the motor case 2 on the inner wall of the fan motor chamber 12b in a vibration-proof manner. The support member 12s formed in a circular shape on the inner wall of the fan motor chamber 12b. It is fitted. The vibration-proof ring 25 and the vibration-proof member 26 are made of a vibration-proof material having elasticity and airtightness such as rubber and sponge.

The support portion 12s has the same center point as the boss 12k on the inner wall surface of the fan motor chamber 12b facing the closed end portion side of the motor case 2 and the boss 12k.
It is formed in the shape of an annular rib having a diameter slightly larger than k. Then, the rotation shaft 4 of the motor is passed through the center of the support portion 12s.
Has an end portion thereof exposed to the outside through an insertion opening 12t opened in the boss 12k, and a tip portion thereof is desired in an arm portion 13a of a nozzle body 13 described later.

On the other hand, in the dust collecting chamber 12c, the dust collecting bag 15 is detachably connected to the dust collecting port 12q provided on the back wall through the mounting port 15a. Further, the dust collection chamber 12c is provided with the partition wall 12
It communicates with the work flow chamber 12w through the communication port 12i provided in a.

In FIG. 4, the nozzle body 13 is formed of a plastic material in a substantially concave box body as viewed from above, and the bosses 12k, 12k of the main body 12 are provided with arm portions 13a, 13b located on both sides of the rear portion. It is rotatably attached to. As shown in FIG. 5, the nozzle body 13 is divided into a front and rear by a partition wall 13c to form a dust suction port portion 13d in the front, and a horizontally wide dust suction port 13e is opened on the lower surface of the dust suction port portion 13d. There is. And this dust suction part 1
A rotating brush 16 is rotatably arranged in the 3d so as to project from the dust suction port 13e.

Both ends of the rotary brush 16 are dust suction ports 13d.
Is attached to a rotary shaft 13f pivotally supported on the inner surfaces of both side walls of the fan, and through a belt 18 suspended between a pulley 17 fixed to the end of the arm 13a and the rotary shaft 4 of the fan motor device. The rotation of the rotating shaft 4 of the fan motor is received and the rotor rotates while contacting the floor surface.

Reference numeral 13g denotes a connection port opened in the partition wall 13c in the arm portion 13b. The connection port 13g and the dust collecting chamber 12
By connecting the dust collecting port 12q of c through the suction side hose 19 (suction side flow path), the air containing the dust sucked through the dust collecting port 13e is passed through the dust collecting bag 15 to accommodate the dust. .

Reference numeral 20 denotes a return passage body formed by molding a synthetic resin such as plastic into a front fan-shaped frame body extending vertically along the outer shape of the central portion of the upper surface of the nozzle body 13 in the left-right direction. By being fixed to the central portion of the upper surface of the nozzle body 13, a return passage 20c is formed between the nozzle body 13 and the upper surface (see FIG. 5). Further, the return passage body 20 has a pipe portion 20a at the upper end thereof connected to the blower pipe 3c of the fan motor device via a return hose 21, and a bent portion 20b formed at the lower end of the return passage body 20 at the front of the dust suction port 13c. Is covered below the front edge of the nozzle body 13. 2
Reference numeral 2 denotes a wheel rotatably attached to the rear portion of the lower end of the main body 12.

The reflux type electric vacuum cleaner of the present invention is constructed as described above, and its operation will be described below. When a power switch (not shown) is turned on, the rotor 5 or the stator 6 of the motor unit of the fan motor device is energized to start the rotation of the rotor 5, and the cooling fan 7 and the power fan 9 are rotationally driven accordingly. To do.

Since the rotation of the power fan 9 produces a suction force in the fan case 3, the air Q _{0 of the} outside, that is, the work flow chamber 12w is sucked into the fan case 3 through the suction port 3b and the fan case 3 is generated. It is accelerated and pressurized by the power fan 9 inside, and is again discharged from the fan case 3 through the blower pipe 3c (first air flow path X).

Due to the generation of this air flow, a suction force acts from the suction port 3b, and the work flow chamber 12w, the communication port 12i, the dust collection chamber 12c, the dust bag 15, the suction side hose 19 and the nozzle body 1 are provided.
The dust suction port 13 of the dust suction port portion 13d through the connection port 13g of No. 3
The dust and dirt on the floor will be sucked in from e.

At this time, the rotation of the rotating shaft 4 of the fan motor device causes the rotation of the belt 18 and the pulley 17.
Is transmitted to the rotating brush 16 via. As a result, the rotating brush 16 rotates to wind up dust on the floor surface, and the dust sucked from the dust suction port 13e contains the dust and dust and sends the dust to the dust bag 15 via the suction side hose 19. As a result, dust and dirt contained in the air stream are collected in the dust bag 1.
On the other hand, the air flow passing through the dust collection bag 15 becomes the air Q ₀ through the communication port 12i and is sucked into the fan case 3 through the suction port 3b.

The air flow discharged from the blower pipe 3c, that is, the air in the first air flow path X, advances to the recirculation path 20c via the recirculation side hose 21, and the dust suction port 13 via this recirculation path 20c.
e to the bent portion 20b leading to e, where the dust on the floor is blown up to be wound up and mixed with the air sucked from the dust suction port 13e to form a large amount of suction air flow. Together with this, dust and dirt on the floor surface are efficiently sent to the suction side hose 19.

On the other hand, since the suction force is generated in the motor case 2 by the rotation of the cooling fan 7, the outside air Q1 is taken into the cooling airflow 12u as the cooling airflow from the cold air outlet 12j of the main body 12. Cold air intake 1 through cold air intake 2c
1h fed from the vent hole 11g of rectifying frame plate 11e in the motor casing 2 to together when sucked into the rectifying frame plate 11e through (see FIG. 2).

After that, the cooling flow, after swirling around the cooling fan 7 portion, passes through the passage 8 between the rotor 5 and the stator 6 to cool the motor, and from the motor exhaust port 2d to the outside of the motor case 2, That is, it is discharged to the exhaust flow chamber v (second air flow path Y) and further discharged to the outside of the main body 12 through the exhaust port 12n.

As described above, the first air flow path X for executing the dust suction operation from the dust suction port 13e and the second air flow path Y for executing the cooling of the motor are generated in association with the driving of the motor when the power switch is turned on. Then you can perform the specified cleaning operation,
In the vacuum cleaner of the present invention, in addition to these air passages, an air passage as the next cooling air is obtained, and the cooling effect of the motor is enhanced.

That is, a part of the air sucked into the fan case 3 as the power fan 9 rotates is accelerated and pressurized as described above, and then the communication ports 11b, 11 of the partition plate 11 are connected.
It is sent into the motor case 2 through c and 11d,
After that, it passes through the inside of the connecting portion 2b of the motor case 2 and the passage 8 together with the second air flow path Y to pass through the motor exhaust port 2
It is discharged to the outside of the motor case 2 from d (third air flow path Z).

[0056]

[0057]

[0058]

[0059]

[0060]

[0061]

[0062]

According to the present invention , the cooling of the motor is performed by the two air flows, so that the temperature rise of the motor can be suppressed, the performance of the motor can be improved, and at the same time, the motor can be shortened due to the rare short circuit. Failures can be reduced.

[0063] In addition, the first to the hard-to-reach location of cold air that enters the motor case than cold air-intake port from the fan case side
Since the cool air in the air flow path enters through the communication port, it becomes easy to mix the air and the cooling effect of the motor increases.

[0064] and may, cold wind speed from cold air inlet, by adjusting the number and size of the communication port in accordance with the air volume,
It is possible to secure the flow rate of the third air flow path without reducing the strength of the partition plate.

[0065]

[0066]

[0067]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a fan motor device according to the present invention.

FIG. 2 is an exploded perspective view of the fan motor device.

FIG. 3 is a plan view of a partition plate in the fan motor device.

FIG. 4 is a perspective view showing an embodiment of a reflux type vacuum cleaner according to the present invention.

FIG. 5 is a side sectional view of the reflux type electric vacuum cleaner.

FIG. 6 is a front sectional view in which a part of the main body of the reflux electric vacuum cleaner is removed.

FIG. 7 is a cross-sectional view showing a conventional fan motor device.

FIG. 8 is a sectional view showing another conventional fan motor device.

[Explanation of symbols]

1 device case 2 motor case 2c Cold air intake 2d motor exhaust port 3 fan case 3b Suction port 3c Blower pipe (blower port) 4 rotation axes 5 rotor 6 stator 7 Cooling fan 8 cold air passages 9 power fan 11 partition boards 11b, 11c, 11d Communication port 12 body 12b Fan motor room 12c dust collection chamber 13 nozzle body 13e Dust suction port 14 Handle body 15 dust bag 16 rotating brush 17 pulley 19 Suction side hose (suction side flow path) 20 ring channel body 21 Return-side hose 22 wheels X First air flow path Y second air flow path Z Third air flow path

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) A47L 5/14 A47L 9/00 H02K 9/06

Claims (3)

(57) [Claims] 1. A motor case having a cool air intake port and a motor exhaust port for covering a motor and a cooling fan rotated by the drive of the motor, and a power having an intake port and a blower port and rotated by the drive of the motor. A fan case that covers the fan is integrated via a partition plate, and a first air flow path through which the suction airflow from the suction port is exhausted from the blower port through the power fan by rotation of the power fan. ,
Due to the rotation of the cooling fan, the suction airflow from the cold air intake port is blocked from the inner wall of the motor case.
It was sucked into the flow frame plate and provided on the flow frame plate.
Secondly, the air is exhausted from the motor exhaust port through the cooling fan from a ventilation hole having a diameter slightly smaller than the outer diameter of the cooling fan.
A fan motor device having an air flow passage and a third air flow passage where a part of the suction air flow from the suction inlet merges with the second air flow passage through a communication opening provided in the partition plate; A main body having a fan motor chamber for accommodating and a dust collection chamber communicating with the fan motor chamber, a nozzle body attached to the main body and a lower portion and having a dust suction port on the lower surface, and exhaust gas of the first air flow path to the dust suction chamber A reflux type electric vacuum cleaner, comprising: a return path that is guided to the mouth and blows onto the floor. 2. The reflux electric vacuum cleaner according to claim 1 , wherein the communication port is provided at a position farthest from the cold air intake port. 3. A reflux vacuum cleaner according to claim 1 or claim 2, characterized in that provided a plurality of said communication port.