JP2006340825A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable and highly efficient motor-driven blower and a vacuum cleaner. <P>SOLUTION: The vacuum cleaner comprises: a self-cooling type motor-driven blower 5 for generating suction force and cooling an electric motor by an obtained air amount; a motor-driven blower chamber 4 for housing the motor-driven blower 5; a dust collecting chamber 3 for catching dust; a heat receiving part 10 for absorbing heat generated by the motor-driven blower 5; a heat radiation part 14 for radiating the heat stored in the heat receiving part 10; piping 15 for connecting the heat receiving part 10 and the heat radiation part 14; a pump 11 for circulating liquid inside the piping 15; and a tank 12 for storing the liquid. The motor-driven blower 5 is constituted so as to be cooled by liquid cooling by the circulated liquid in addition to air cooling by the suction force. Thus, the cooling efficiency of the motor-driven blower 5 is improved and the highly reliable motor-driven blower 5 with high blowing efficiency and the vacuum cleaner are provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric blower used for a vacuum cleaner or the like.

Generally, the cooling of electric blowers for vacuum cleaners is configured to cool the electric motor by using the exhaust of the fan that generates suction force, and the pressure loss increases due to the complexity of the airflow passage However, there was a problem that the ventilation efficiency was lowered. For example, Patent Document 1 below is a solution to this problem.
Japanese Patent Laid-Open No. 5-84169

  However, in the configuration of the above document, in a state where the intake air volume is reduced, for example, in a state where dust is collected to some extent in the dust collection chamber, the electric blower cannot be sufficiently cooled, and in this state When used continuously, the temperature of the electric blower is high, which causes abnormal sparks, reduced brush life, and the like. In the end, the motor is cooled by airflow, and some pressure loss is avoided, but the effect is insufficient.

  An object of the present invention is to solve the above-mentioned problems, suppress heat generation of an electric blower, provide a more reliable electric blower or vacuum cleaner, and provide an electric blower and a vacuum cleaner with high blowing efficiency. It is what.

  In order to solve the above-described conventional problems, a vacuum cleaner according to the present invention generates a suction force and cools the electric motor with the obtained air volume, and an electric blower chamber that houses the electric blower. A dust collecting chamber for collecting dust, a heat receiving part for absorbing heat generated by the electric blower, a heat radiating part for radiating heat stored in the heat receiving part, and a heat receiving part and a heat radiating part. It comprises a pipe to be connected, a pump for circulating the liquid in the pipe, and a tank for storing the liquid, and the electric blower is cooled by liquid cooling by the circulating liquid in addition to air cooling by suction force. To do.

  Thereby, since the electric blower is efficiently cooled, the reliability of the electric blower can be improved even in a state where the air volume is reduced.

  The vacuum cleaner of the present invention efficiently cools the electric blower, improves reliability, and realizes an electric blower and vacuum cleaner with high blowing efficiency.

  The first invention includes a self-cooling type electric blower that generates suction force and cools the electric motor with the obtained air volume, an electric blower chamber that houses the electric blower, and a dust collection chamber that collects dust. A heat receiving part for absorbing the heat generated by the electric blower, a heat radiating part for radiating heat stored in the heat receiving part, a pipe connecting the heat receiving part and the heat radiating part, and circulating a liquid in the pipe Equipped with a pump and a tank for storing liquid, the electric blower is cooled not only by air cooling by suction force but also by liquid cooling by circulating liquid, so that cooling of the electric blower is very efficient Since it is often performed, the reliability is high, and the efficiency of the electric motor is improved, the electric blower has a high blowing efficiency. Moreover, the suction performance as a vacuum cleaner improves by ventilation efficiency improvement.

  The second invention is characterized in that when the air flow generated by the electric blower is large, cooling is performed by air cooling, and when the air flow is reduced, cooling by liquid cooling is started, thereby obtaining a sufficient air flow. When cooling with air cooling as before, the liquid circulation pump is driven and liquid cooled only when the air flow is reduced, so that the power consumption of the pump can be suppressed as much as possible. Optimization can be achieved.

  In the third aspect of the invention, the heat receiving portion is disposed on the outer periphery of the bracket of the electric blower, so that the heat of the electric motor portion of the electric blower can be efficiently exchanged.

  4th invention can cool efficiently the brush part which temperature rises most in an electric motor and has the greatest influence on a brush life by arrange | positioning a heat receiving part in the brush part of an electric blower.

  In the fifth aspect of the present invention, the heat receiving portion is disposed in the space between the bracket of the electric blower and the field core, so that the heat of the electric motor can be directly absorbed from the core, and the heat exchange efficiency can be further improved. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of the vacuum cleaner of the present embodiment. The vacuum cleaner main body 1 (hereinafter referred to as the main body) has a dust collection bag 2 for collecting dust in the front, and a self-cooling electric blower 5 in the rear electric blower chamber 4. Has been. Above that, a cord reel 7 for winding a power cord 6 for supplying power from a household power source and a control board 37 for controlling the rotation of the electric blower 5 are provided. A hose connection portion 8 connected to a suction tool (not shown) is inserted in front of the main body 1. The outer periphery of the anti-load side bracket 9 of the electric blower 5 is covered with a heat receiving portion 10 that absorbs heat generated by the electric blower 5. Reference numeral 16 denotes an exhaust port. A pump 11 and a tank 12 are arranged below the electric blower chamber 4. A heat radiating portion 14 provided with a plurality of cooling fins 13 is disposed below the dust collection chamber 3. The heat receiving unit 10, the pump 11, the tank 12, and the heat radiating unit 14 are connected by a pipe 15, the inside of which is filled with a liquid, and the liquid circulates inside each component. FIG. 2 shows the relationship between the air volume and the input (power consumption) of the vacuum cleaner.

  Next, the operation and action of the above configuration will be described.

  When the vacuum cleaner is driven, electric power is supplied from the power cord 6, and the electric blower 5 is driven to rotate through the cord reel 7. At this time, the electric blower 5 is driven under the control of the control board 37. When the electric blower 5 is driven, a suction force is generated, the inside of the dust collecting chamber 3 becomes a negative pressure with respect to the outside air, and a suction tool (not shown) flows in along with the dust. Dust is collected in the dust bag 2, but the airflow flows through the electric blower 5 and is discharged from the exhaust port 16 of the main body 1. At this time, the electric blower 5 converts some of the supplied power into suction energy, but surplus energy is mainly released as heat as loss. Conventionally, the heat generated by the electric blower 5 is cooled by the intake air generated by the electric blower 5 itself, and the temperature rise of the electric blower 5 is suppressed. Further, in FIG. 2, when the air volume is reduced from Q2, the temperature of the electric blower 5 rises and adversely affects the reliability. . Originally, even if dust is collected in the dust collection bag 2 and the air volume is reduced, it is desirable that the input can be maintained for as long as possible and the cleaning can be continued if the dust collection volume is sufficient.

  In the present invention, when the air volume is large, that is, between Q0 to Q1 and Q2 in FIG. 2, the electric blower 5 cools by the airflow generated by itself as usual. Conversely, the cooling limit of the electric blower 5 is Q2. When the air volume is reduced from Q2, the temperature rise of the electric blower 5 increases too much only by air cooling, so the pump 11 is driven and the electric blower is cooled by liquid cooling. That is, the heat generated in the electric blower 5 is taken away by the heat receiving unit 10 disposed on the outer periphery thereof, and is heat exchanged with the liquid circulating in the heat receiving unit 10. The liquid moves in the pipe 15 by the action of the pump 11 and reaches the heat radiating portion 14 disposed in the dust collecting chamber 3. However, the heat radiating portion 14 is exposed to the intake air, and the plurality of cooling fins 13. It also cools to the same temperature as the intake air, helping the heat dissipation effect. The cooled liquid passes through the tank 12, passes through the pump 11, reaches the heat receiving unit 10 again, and absorbs the heat of the electric blower 5. By this cooling action, the reliability of the electric blower 5 is maintained even with a low air volume. Therefore, the point at which the input is drastically dropped to maintain the reliability of the electric blower 5 can be expanded from Q2 to Q3, the air volume range that can be cleaned by the user is increased, and the usability is improved.

  Thus, the electric blower 5 is sufficiently cooled by the heat exchange of the liquid, which has higher cooling efficiency than the conventional air cooling, and the temperature thereof is reduced. Further, in the conventional air cooling system, the air volume is narrowed down, that is, when the dust bag 2 is filled with dust and sufficient air volume does not flow, or when the dust bag 2 is clogged, or the main body 1 In the case where the filters (not shown) are clogged, there is a situation in which the air flow sufficient to cool the electric blower 5 is not obtained and the temperature of the electric blower 5 is likely to rise. In the invention, even when the intake air volume is reduced, the temperature rise of the electric blower 5 can be suppressed by the amount of high cooling efficiency.

  Further, for example, the power receiving cord 10 can be cooled not only in the electric blower 5 but also in the vicinity of the power cord 6 and piping.

  Further, the anti-load side bracket 9 of the electric blower 5 is often made of iron, but if it is made of a material having a higher thermal conductivity than iron, the transmission efficiency to the heat receiving part 10 is increased and the cooling efficiency is further increased. .

  In addition, although this Embodiment took the dust bag type vacuum cleaner as an example, even if it is arrange | positioned in the position of the temperature equivalent to external air also in the cyclone type vacuum cleaner, the same effect will be obtained. Is obtained.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to FIG. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. FIG. 3 is a cross-sectional view of the vacuum cleaner body 1, and the side wall of the dust collection chamber 3 has a double structure. The heat radiating portion 14 is housed between the double side walls, and only the tips of the cooling fins 13 protrude into the dust collecting chamber 3.

  The operation and action of the above configuration will be described.

  When the vacuum cleaner is driven, electric power is supplied from the power cord 6, and the electric blower 5 is driven to rotate through the cord reel 7. When the electric blower 5 is driven, a suction force is generated, the inside of the dust collecting chamber 3 becomes a negative pressure with respect to the outside air, and a suction tool (not shown) flows in along with the dust. Dust is collected in the dust bag 2, but the airflow flows through the electric blower 5 and is discharged from the exhaust port 16 of the main body 1. At this time, the electric blower 5 converts some of the supplied power into suction energy, but surplus energy is mainly released as heat as loss. Conventionally, the heat generated by the electric blower 5 is cooled by the intake air generated by the electric blower 5 itself, and the temperature rise of the electric blower 5 is suppressed. In the present invention, the heat generated in the electric blower 5 is taken away by the heat receiving unit 10 disposed on the outer periphery thereof, and is heat exchanged with the liquid circulating in the heat receiving unit 10. The liquid moves in the pipe 15 by the action of the pump 11 and reaches the heat radiating portion 14 disposed between the side walls of the dust collection chamber, but the tips of the cooling fins 13 of the heat radiating portion 14 are exposed to the intake air. It is cooled to the same temperature as the intake air. The cooled liquid passes through the tank 12, passes through the pump 11, reaches the heat receiving unit 10 again, and absorbs the heat of the electric blower 5.

  Thus, the electric blower 5 is sufficiently cooled by the heat exchange of the liquid, which has higher cooling efficiency than the conventional air cooling, and the temperature thereof is reduced. Further, since the heat radiating portion 14 is arranged in the dead space between the dust collection chamber side walls, the space can be used effectively, and the dust collection chamber 3 has only minimal unevenness. When the bag 2 is full, it is possible to prevent the bag from being broken as much as possible.

  In addition, even when the heat radiating portion 14 is arranged at the bottom of the dust collecting chamber 3 as in the first embodiment, it is needless to say that the same effect can be obtained even if the bottom wall is configured in a double structure. Absent.

(Embodiment 3)
Next, a third embodiment of the present invention will be described with reference to FIG. Note that the same reference numerals are given to the same components as those in the above embodiment, and the description thereof is omitted. FIG. 4 is a cross-sectional view of the vacuum cleaner body 1, 17 is a dust collection chamber lid, 18 is a reinforcing rib on the back of the lid, and the heat radiating portion 14 is accommodated within the height of the rib 18.

  The operation and action of the above configuration will be described.

  When the vacuum cleaner is driven, electric power is supplied from the power cord 6, and the electric blower 5 is driven to rotate through the cord reel 7. When the electric blower 5 is driven, a suction force is generated, the inside of the dust collecting chamber 3 becomes a negative pressure with respect to the outside air, and a suction tool (not shown) flows in along with the dust. Dust is collected in the dust bag 2, but the airflow flows through the electric blower 5 and is discharged from the exhaust port 16 of the main body 1. At this time, the electric blower 5 converts some of the supplied power into suction energy, but surplus energy is mainly released as heat as loss. Conventionally, the heat generated by the electric blower 5 is cooled by the intake air generated by the electric blower 5 itself, and the temperature rise of the electric blower 5 is suppressed. In the present invention, the heat generated in the electric blower 5 is taken away by the heat receiving unit 10 disposed on the outer periphery thereof, and is heat exchanged with the liquid circulating in the heat receiving unit 10. The liquid moves in the pipe 15 by the action of the pump 11 and reaches the heat radiating portion 14 disposed in the dust collecting chamber lid 17. However, the heat radiating portion 14 is exposed to the intake air, and a plurality of cooling fins are provided. The heat radiation effect of 13 is also helped, and it is cooled to the temperature equivalent to intake air. The cooled liquid passes through the tank 12, passes through the pump 11, reaches the heat receiving unit 10 again, and absorbs the heat of the electric blower 5.

  Thus, the electric blower 5 is sufficiently cooled by the heat exchange of the liquid, which has higher cooling efficiency than the conventional air cooling, and the temperature thereof is reduced. Further, since the heat radiating portion 14 is disposed within the height of the reinforcing rib 18 of the dust collection chamber lid 17, it is in the dead space that originally existed, and does not affect the volume of the dust collection chamber 3, and thus the dust collection chamber 3 is not affected. The dust collection volume of the dust bag 2 can be ensured.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described with reference to FIG. Note that the same reference numerals are given to the same components as those in the above embodiment, and the description thereof is omitted. FIG. 5 is a partial cross-sectional view of the vacuum cleaner body 1, 19 is a communication hole that separates the dust collection chamber 3 and the electric blower chamber 4, and the heat receiving portion 10 is also attached around the brush holder 20. Further, the heat radiating part 14 having the cooling fins 13 is arranged in a space between the communication hole 19 and the electric blower 5.

  The operation and action of the above configuration will be described.

  When the electric vacuum cleaner is driven, the electric blower 5 is rotationally driven. When the electric blower 5 is driven, a suction force is generated, the inside of the dust collecting chamber 3 becomes a negative pressure with respect to the outside air, and a suction tool (not shown) flows in along with the dust. The airflow flows through the electric blower 5 and is discharged from the exhaust port 16 of the main body 1. At this time, the electric blower 5 converts some of the supplied power into suction energy, but surplus energy is mainly released as heat as loss. Conventionally, the heat generated by the electric blower 5 is cooled by the intake air generated by the electric blower 5 itself, and the temperature rise of the electric blower 5 is suppressed. In the present invention, the heat generated in the electric blower 5 is taken away by the heat receiving portion 10 disposed around the outer periphery and the brush holder, and is heat-exchanged with the liquid circulating in the heat receiving portion 10. The liquid moves in the pipe 15 by the action of the pump 11 and reaches the heat radiating portion 14. However, the heat radiating portion 14 and the cooling fin 13 are exposed to the intake air and cooled to a temperature equivalent to that of the intake air. The cooled liquid passes through the tank 12, passes through the pump 11, reaches the heat receiving unit 10 again, and absorbs the heat of the electric blower 5.

  Thus, the electric blower 5 is sufficiently cooled by the heat exchange of the liquid, which has higher cooling efficiency than the conventional air cooling, and the temperature thereof is reduced. In addition, since the heat radiating portion 14 is disposed in the dead space between the communication hole 19 and the electric blower 5, the space can be effectively used, and this position is immediately before the intake air flows into the electric blower 5. Since the flow rate of the gas gradually increases, the heat dissipation action is performed more actively, so that the cooling efficiency is particularly good.

(Embodiment 5)
Next, a fifth embodiment of the present invention will be described with reference to FIG. Note that the same reference numerals are given to the same components as those in the above embodiment, and the description thereof is omitted. FIG. 6 is a partial cross-sectional view of the electric vacuum cleaner main body 1, 19 is a communication hole that separates the dust collecting chamber 3 and the electric blower chamber 4, and the heat receiving portion 10 is also attached around the brush holder 20. Further, the communication hole 19 is hollow inside, and the communication hole 19 itself becomes the heat radiating portion 14 and is stretched around in a lattice shape.

  The operation and action of the above configuration will be described.

  When the electric vacuum cleaner is driven, the electric blower 5 is rotationally driven. When the electric blower 5 is driven, a suction force is generated, the inside of the dust collecting chamber 3 becomes a negative pressure with respect to the outside air, and a suction tool (not shown) flows in along with the dust. The airflow flows through the electric blower 5 and is discharged from the exhaust port 16 of the main body 1. At this time, the electric blower 5 converts some of the supplied power into suction energy, but surplus energy is mainly released as heat as loss. Conventionally, the heat generated by the electric blower 5 is cooled by the intake air generated by the electric blower 5 itself, and the temperature rise of the electric blower 5 is suppressed. In the present invention, the heat generated in the electric blower 5 is taken away by the heat receiving portion 10 disposed around the outer periphery and the brush holder, and is heat-exchanged with the liquid circulating in the heat receiving portion 10. The liquid moves in the pipe 15 by the action of the pump 11 and reaches the heat radiating portion 14, but the communication hole 19 itself is the heat radiating portion 14 and is always exposed to the intake air, and has the same temperature as the intake air. Until cooled. The cooled liquid passes through the tank 12, passes through the pump 11, reaches the heat receiving unit 10 again, and absorbs the heat of the electric blower 5.

  Thus, the electric blower 5 is sufficiently cooled by the heat exchange of the liquid, which has higher cooling efficiency than the conventional air cooling, and the temperature thereof is reduced. In addition, since the communication hole 19 itself is configured by the heat radiating portion 14, the space can be effectively used, and this position is immediately before the intake air flows into the electric blower 5, and the flow velocity of the intake air gradually increases. Since the heat dissipating action is performed more actively, the cooling efficiency is particularly good.

  If the communication hole 19 is made of a metal having good heat dissipation, the heat dissipation effect is further improved.

(Embodiment 6)
Next, a sixth embodiment of the present invention will be described with reference to FIGS. Note that the same reference numerals are given to the same components as those in the above embodiment, and the description thereof is omitted. FIG. 7 is a partial cross-sectional view of the electric blower 5, and FIG. 8 is an arrow view seen from the load side with the fan portion of the electric blower 5 removed and the load side bracket removed.

  Reference numeral 21 denotes a stator formed by applying field windings (omitted) to the field core 22, and 23 denotes armature windings (schematically) to an armature core 25 passed through the shaft 24, so that the commutator 26 is coaxially arranged. The rotor is disposed and fixed rotatably by bearings 27 provided at both ends of the shaft 24. The stator 21 and the rotor 23 are fixed to the load-side bracket 28 and the anti-load-side bracket 9, and a pair of carbon brushes (not shown) are inserted into the anti-load-side bracket 9 via the brush holder 20 to make the electric motor 30. Forming. 31 is an exhaust port A and 32 is an exhaust port B. Further, the shaft 24 of the output shaft is provided with an impeller 33, and an air guide 34 that forms a ventilation path is disposed on the outer periphery of the impeller 33. And the casing 35 is attached so that these may be covered, and it becomes the electric blower 5. FIG. Reference numeral 36 denotes an intake port. The heat receiving unit 10 is attached to the four side surfaces of the field core 22 and connected to each other, and is connected to the heat radiating unit 14 and the pump 11 by the pipe 15.

  Moreover, this electric blower 5 is accommodated in the electric blower chamber 4 like the said embodiment.

  In the above configuration, when electric power is supplied, a current conducted through the field winding is transmitted to the commutator 26 through a carbon brush (not shown), and the magnetic flux generated in the field core 22 and the armature winding (see FIG. A force is generated between the current passing through (not shown) and the rotor 23 rotates. Next, when the rotor 23 rotates, the impeller 33 fixed to the shaft 24 of the rotor 23 rotates, and the air in the impeller 33 is accelerated. The increased air passes through the air guide 34 and partially passes through the air guide 34. The airflow is discharged from the exhaust port A31, and the remaining airflow is guided to the electric motor 30. While the rotor 23, the stator 21 and the carbon brush (not shown) are air-cooled, they are discharged from the exhaust port B32 of the non-load side bracket 9, but in this embodiment, the heat receiving part 10 is used as the field core. Since it is arranged on the side surface 22, as shown in the above embodiment, the heat receiving part 10 is more excellent in heat receiving than arranging the heat receiving part 10 on the outer periphery of the anti-load side bracket 9 and can cool the electric blower 5 efficiently. It is.

  In recent years, for the purpose of improving the blowing efficiency, many electric blowers 5 having an exhaust port A31 in the casing 35 have been seen. However, in this case, the air volume for air cooling is reduced and the cooling of the electric motor 30 is reduced. There was a tendency for efficiency to decrease. However, if this embodiment is used, a cooling performance equal to or higher than that of the conventional technology can be ensured. If all the intake air is discharged from the exhaust port A31 and the electric motor 30 is all cooled by liquid cooling, the electric blower 5 with higher blowing efficiency can be realized.

  As described above, since the electric vacuum cleaner according to the present invention can improve the reliability of the electric blower, improve the efficiency of the electric blower, and improve the suction performance of the electric vacuum cleaner, the household electric appliance using the electric blower It can be applied to a wide range of applications such as industrial equipment.

Sectional drawing of the vacuum cleaner which shows the 1st Embodiment of this invention Correlation diagram between air volume and input (power consumption) of the vacuum cleaner showing the first embodiment of the present invention Sectional drawing of the vacuum cleaner which shows the 2nd Embodiment of this invention Sectional drawing of the vacuum cleaner which shows the 3rd Embodiment of this invention Partial sectional drawing of the vacuum cleaner which shows the 4th Embodiment of this invention Partial sectional drawing of the vacuum cleaner which shows the 5th Embodiment of this invention Partial sectional drawing of the electric blower which shows the 6th Embodiment of this invention Arrow view of an electric blower showing a sixth embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 2 Dust collection bag 3 Dust collection chamber 4 Electric blower chamber 5 Electric blower 6 Power cord 7 Cord reel 8 Hose connection part 9 Anti-load side bracket 10 Heat receiving part 11 Pump 12 Tank 13 Cooling fin 14 Heat radiation part 15 Piping 16 Exhaust port 17 Dust collecting chamber lid 18 Reinforcing rib 19 Communication hole 20 Brush holder 21 Stator 22 Field core 23 Rotor 24 Shaft 25 Armature core 26 Commutator 27 Bearing 28 Load side bracket 30 Motor 31 Exhaust port A
32 Exhaust port B
33 Impeller 34 Air guide 35 Casing 36 Air inlet 37 Control board

Claims (5)

A self-cooling type electric blower that generates suction force and cools the electric motor with the obtained air volume, an electric blower chamber that houses the electric blower, and a dust collection chamber that collects dust, the electric blower comprising: A heat receiving part for absorbing generated heat, a heat radiating part for radiating heat stored in the heat receiving part, a pipe connecting the heat receiving part and the heat radiating part, a pump for circulating the liquid in the pipe, and storing the liquid A vacuum cleaner comprising a tank, wherein the electric blower is cooled not only by air cooling by a suction force but also by liquid cooling by a circulating liquid. 2. The electric vacuum cleaner according to claim 1, wherein when the air flow generated by the electric blower is large, cooling is performed by air cooling, and when the air flow is reduced, cooling by liquid cooling is started. The vacuum cleaner of Claim 1 or 2 which has arrange | positioned the heat receiving part in the outer periphery of the bracket of an electric blower. The vacuum cleaner of any one of Claims 1-3 which has arrange | positioned the heat receiving part in the brush part of the electric blower. The vacuum cleaner of any one of Claims 1-4 which has arrange | positioned the heat receiving part in the space between the bracket of an electric blower, and a field core.

Images