JP2005040251A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure capable of efficiently cooling a power device such as a switching element for driving a motor-driven blower mounted on a vacuum cleaner. <P>SOLUTION: For the vacuum cleaner, the power device 51 is arranged on the outer surface of the motor-driven blower 10 not covered with a support body 32 on a suction side from a motor part 22, for instance a flange part 46 which is a flat part formed by the level difference between a motor case 27 and a fan cover 23. Since an air stream inside a flow path 58 is not disturbed by the power device 51, air path loss is not increased and the attaching structure is positioned on the upstream side from the motor part 22 in air flow by a centrifugal fan 21 as well, the power device 51 is efficiently cooled without being affected by the heat of the motor part 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vacuum cleaner that blows air by rotating an electric blower.
[0002]
[Prior art]
In the electric blower of FIG. 1 in Patent Document 1, an example is shown in which a switching element is provided in close contact with the outer periphery of the motor casing in a space formed by a step between the outer peripheral portion of the motor casing and the outer peripheral portion of the fan casing. Yes.
[0003]
[Patent Document 1]
JP-A-6-26494 (FIG. 1)
[0004]
[Problems to be solved by the invention]
In the electric blower shown in FIG. 1 of Patent Document 1, a switching element is provided on the outer periphery of the motor casing. However, since it is attached to the outer periphery of the motor casing close to the stator, it is easily affected by the heat generated from the stator, so the cooling effect of the switching element is low. In addition, the outer periphery of the motor casing is usually subjected to various types of processing for various purposes, and since the outer peripheral surface shape is a curved surface, the degree of freedom of arrangement of the switching element is small, and the switching element And the motor casing are difficult to adhere to each other. Such a defect also causes an increase in cost due to an increase in processing steps and the like. In particular, in a vacuum cleaner provided with a plurality of power devices such as switching elements to be cooled, these problems become significant.
[0005]
Then, the objective of this invention is providing the structure which can cool efficiently power devices like the switching element which drives the electric blower mounted in the vacuum cleaner.
[0006]
[Means for Solving the Problems]
The electric vacuum cleaner of the present invention includes an electric blower having a motor unit and a centrifugal fan attached to the rotating shaft of the motor unit, an electric blower chamber that houses the electric blower, and a drive for driving the electric blower. A vacuum cleaner comprising: a circuit; and a support attached to the suction side outer peripheral portion of the electric blower, wherein the support is brought into contact with a wall of the electric blower chamber, and power in the drive circuit By disposing the device on the suction side of the motor unit and on the outer surface of the electric blower that is not covered by the support, it is possible to efficiently cool a power device such as a switching element that drives the electric blower. did.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of a vacuum cleaner according to the present invention will be described with reference to FIGS. FIG. 1 is a longitudinal side view showing the electric vacuum cleaner of the present embodiment, FIG. 2 is a side view showing a part of the configuration of the electric blower, and FIG. 3 is a plan view showing a part of the internal configuration, FIG. 4 is a plan view and a bottom view showing a configuration example of the diffuser, and FIG. 5 is a schematic circuit diagram showing a drive circuit of the electric blower.
[0008]
First, the configuration of the vacuum cleaner will be described with reference to a longitudinal side view of the vacuum cleaner shown in FIG. The vacuum cleaner main body 1 of the vacuum cleaner of the present embodiment closes the lower case 2a formed of, for example, acrylonitrile-butadiene-styrene (ABS) whose upper surface is opened, and the rear upper surface of the lower case 2a. An upper case 2b made of the same material has a main body case 2 as a case body that is joined by sandwiching a bumper (not shown) around the periphery including the front surface and opening the front upper surface portion. The main body case 2 is formed by rotatably supporting a lid 3 that closes an opening of a front upper surface portion so as to be freely opened and closed.
[0009]
The main body case 2 is provided with a swivel ring 4 that is turnable on the front lower surface in the traveling direction, and a large-diameter driven wheel 5 that is rotatably provided on the rear side surface of the main body case 2. 4 and the driven wheel 5 can travel on a floor surface (not shown). A handle 6 that is slidable in the vertical direction is provided on the upper portion of the main body case 2.
[0010]
On the other hand, in the cleaner main body 1, a dust collection chamber 9 whose upper side is opened by a partition wall 8 having a grid-like communication hole 7 is partitioned and formed on the front side in the traveling direction of the cleaner main body 1. An electric blower chamber 11 in which the electric blower 10 is housed is defined behind the dust collection chamber 9. A dust collection bag 13 is detachably mounted in the dust collection chamber 9 by a holder 12 formed in the dust collection chamber 9.
[0011]
Further, an auxiliary dust collection filter 14 covering the communication hole 7 is detachably mounted on the front surface of the partition wall 8. The auxiliary dust collection filter 14 includes a frame body 15 and an auxiliary filter 16 that is inserted into the frame body 15.
[0012]
The dust collection bag 13 and the auxiliary dust collection filter 14 are attached and detached through the upper surface opening of the dust collection chamber 9. The lid 3 has a rear end pivotally attached to the upper case 2a, and is formed so as to cover the dust collection chamber 9 from above to be freely opened and closed.
[0013]
On the other hand, an electric blower 10 is disposed in the electric blower chamber 11. The electric blower 10 includes a motor unit 22 that rotationally drives the centrifugal fan 21 and a fan cover 23 that covers the centrifugal fan 21. The motor unit 22 mainly includes a stator 24 and a rotor 25. A suction opening 26 is formed in the center of the front surface of the fan cover 23, and an electric blower exhaust port 28 is formed in the motor case 27 of the motor unit 22. The fan cover 23 and the motor case 27 constitute a case. In addition, a bearing housing portion 31b in which a bearing 30b for supporting a rotor shaft 29 for rotating the centrifugal fan 21 is provided in a substantially central portion of the rear end surface of the motor portion 22 so as to protrude rearward.
[0014]
Furthermore, a natural rubber or synthetic rubber support 32 is fitted on the outer peripheral edge of the front end of the electric blower 10, for example. On the other hand, on the lower surface of the upper case 2b and the upper surface of the lower case 2a, an upper rib front portion 33 and a lower rib front portion 34 that form a part of the wall of the electric blower chamber 11 are formed to project. The support 32 is brought into contact with the upper rib front portion 33 and the lower rib front portion 34, and the electric blower 10 is positioned and fixed.
[0015]
The support 32 is crushed by the negative pressure generated by driving the electric blower 10, and the suction opening 26 of the electric blower 10 communicates with the dust collection chamber 9 on the front end side of the electric blower 10 by the support 32. 7 to communicate in an airtight manner.
[0016]
The support 32 has an annular shape with a substantially L-shaped cross section, and is disposed between the electric blower 10 and the wall of the electric blower chamber 11. As described above, the material of the support 32 is a vibration absorbing member such as natural rubber or synthetic rubber. In the present embodiment, the power device such as the switching element 51 that drives the electric blower 10 is directly attached to the outer surface of the electric blower 10, so that when the electric vacuum cleaner is moved, The received vibration of the main body case 2 is transmitted to the power device 51 almost as it is. However, since the support 32 is formed of a vibration absorbing member, the transmission of vibration from the main body case 2 can be kept low, and the reliability of the power device 51 is improved.
[0017]
Here, the electric blower 10 will be described in more detail with reference to FIGS. 2 and 3. The electric blower 10 has a motor case 27, and the motor unit 22 is accommodated inside the motor case 27. The motor shown in FIGS. 1 and 2 is a brush motor. A longitudinal plate-like bracket 35 is attached to the front end of the motor case 27 with screws 37 so as to bridge the radial direction of the motor case 27 and cover a part of the frame opening 36. Near the center of the bracket 35 is provided a bearing housing portion 31a that protrudes forward in a substantially cylindrical shape, houses the bearing 30a on the inner peripheral side, and opens a through hole 38 in the substantially center. The frame opening 36 of the motor case 27 that is not covered with the bracket 35 serves as a ventilation hole.
[0018]
A diffuser 39 is fixed to the front side of the bracket 35. Further, the centrifugal fan 21 is disposed in front of the diffuser 39. A fan cover 23 is fitted to the outer periphery of the motor case 27, and the centrifugal fan 21 is covered with the fan cover 23. The fan cover 23 is formed in a substantially cylindrical shape by forming a suction opening 26 facing the ventilation opening of the centrifugal fan 21 at the center of the front surface and forming a rear opening (not shown) on the entire rear surface. Is formed.
[0019]
As shown in FIG. 4, the diffuser 39 includes a substantially disc-shaped disc portion 41, a through hole 42 formed at a substantially center of the disc portion 41 and through which the rotor shaft 29 passes, and a bracket 35 with screws. Screw holes 43a and 43b for fixing, a plurality of arcuate blades 44 erected near the outer peripheral edge of the diffuser 39 so as to be positioned on the outer peripheral part of the centrifugal fan 21, and the other surface side of the disk part 41 And a plurality of arcuate blades 45 erected in a spiral shape on the back surface. Such a diffuser 39 is inserted and opposed to the flange portion 46 of the electric blower 10 and is fixed to the bracket 35 with a screw.
[0020]
In such a configuration, when the rotor shaft 29 rotates, the centrifugal fan 21 rotates integrally with the rotation, and the suction air is blown out from the centrifugal fan discharge port 47 through the centrifugal fan 21 by this rotation. Is done. The air flows so as to spread in the axial direction between the arcuate blades 44 along the inner peripheral surface of the fan cover 23. Next, the air flows spirally between the arcuate blades 45 toward the center of the diffuser 39 on the back surface side of the disc portion 41. In this way, the diffuser 39 uniformly rectifies the air blown from the centrifugal fan discharge port 47 and guides it to the motor unit 22.
[0021]
On the other hand, the motor unit 22 includes a stator 24 fixed to a motor case 27 and a rotor 25 disposed inside the stator 24. The rotor 25 is disposed substantially coaxially in the motor case 27 with both end portions of a rotor shaft 29 serving as an axis of rotation about the shaft being rotatably supported by bearings 30a and 30b. Further, an electric blower exhaust port 28 serving as an exhaust port is formed in the peripheral surface near the rear portion of the motor case 27 so as to be positioned substantially in the radial direction.
[0022]
In such a configuration, when the rotor shaft 29 rotates, the centrifugal fan 21 rotates integrally with the rotation, and the suction fan 26 is rotated by the rotation from the suction opening 26 formed on the suction side of the fan cover 23. , The centrifugal fan discharge port 47, the diffuser 39, the motor unit 22, and the electric blower exhaust port 28.
[0023]
Next, the configuration of the drive circuit of the electric blower 10 will be described with reference to the circuit diagram shown in FIG. The electric blower 10 is connected to a commercial AC power supply 52 via a switching element 51 that is a power device for power control. A vacuum cleaner control unit 54 composed of a microcomputer 53 or the like is connected to the control terminal of the switching element 51. The switching element 51 and the vacuum cleaner controller 54 are mounted on the circuit board 55. Further, a hand operating unit 56 is connected to the vacuum cleaner control unit 54. The hand operation unit 56 also serves as a power switch of the electric blower 10 and is configured to be able to select a plurality of types of operation modes that make the electric blower 10 in different driving states. Specifically, a stop operation button 56a that sets the operation mode to the stop state, a weak operation button 56b that sets the operation mode to the weak operation state, and a strong operation button 56c that sets the operation mode to the strong operation state are sequentially arranged in a line. It is arranged. With such a configuration, for example, in a strong operation state, the electric blower 10 rotates at a high speed of 30,000 rpm and sucks dust.
[0024]
In such a configuration, in the present embodiment, the power device such as the switching element 51 included in such a drive circuit is connected to the electric blower 10 that is not covered by the support 32 on the suction side from the motor unit 22. The outer surface, specifically, the fan cover 23 is formed with a different diameter so that the diameter of the fan cover 23 is larger than that of the motor case 27, and a plane formed by a step between the motor case 27 and the fan cover 23. It is arranged on the flange portion 46 which is a portion and is fixed by, for example, a screw 57.
[0025]
According to such a mounting structure of the switching element 51 (power device), the switching element 51 is not disposed in the air passage in the electric blower 10, and the outer surface of the electric blower 10 (the motor case 27 and the fan cover 23). Therefore, the air flow in the flow path inside the electric blower 10 is not disturbed. Therefore, the heat of the switching element 51 can be released to the motor case 27 and the fan cover 23 without increasing the flow path loss of the electric blower 10 by the switching element 51. In addition, since the portion where the switching element 51 is disposed is at a position farther upstream than the motor unit 22 in the cooling airflow by the centrifugal fan 21, the influence of heat generated by the motor unit 22 is small and the cooling effect is high. It is also a part, and the switching element 51 can be efficiently cooled. That is, during the operation of the electric blower 10, the temperature of the air flowing inside the flange portion 46 where the switching element 51 is disposed is upstream of the motor portion 22, so that the temperature of the air downstream of the motor portion 22 is higher. Low and high cooling effect. Further, such a flange portion 46 is a step portion using the difference in diameter between the fan cover 23 and the motor case 27, and can be easily formed as a flat portion structurally. Since 51 should just be attached, compared with the case where it attaches to the outer peripheral surface of the motor case 27, it becomes a thing with the high attachment freedom degree of the said switching element 51.
[0026]
In addition, in the present embodiment, the switching element 51 is disposed at a position facing the diffuser 39 in the flange portion 46 formed in such a stepped portion. As a result, a result that the cooling effect is greater than that when the flange portion 46 is not opposed to the diffuser 39 is obtained.
[0027]
The mounting position of the switching element 51 is such that the discharge port 47 portion of the large centrifugal fan 21 and the small diameter motor case in the entire flow path through which the cooling airflow flows when the electric blower 10 is structurally viewed. 27 is a part of the flow path 58 that connects the motor part 22 side part accommodated in the part 27, and is a part having a large pressure gradient. The cooling airflow flowing through the flow path 58 of this part has a high flow velocity, and the cooling effect of the flange part 46 Therefore, it is considered that the switching element 51 disposed on the flange portion 46 can be effectively cooled. In particular, in the present embodiment, such a flange portion 46 is also a portion facing the diffuser 39 that rectifies the airflow from the discharge port 47 of the centrifugal fan 21 toward the motor portion 22. It is considered that the cooling effect of the flange portion 46 by the cooling airflow flowing through the channel 58 of the facing portion is extremely large, and the switching element 51 arranged in the flange portion 46 can be effectively cooled.
[0028]
In the present embodiment, since the switching element 51 and the support body 32 are close to each other, the support body 32 is affected by the heat of the switching element 51 when the electric blower 10 is driven. Therefore, the reliability of the vacuum cleaner is improved by using a heat-resistant material such as silicone rubber or ethylene propylene rubber as the material of the support 32.
[0029]
Similarly, the support 32 is formed of a heat insulating member so that the wall of the electric blower chamber 11, that is, the main body case 2 is not deformed by the heat generated by the switching element 51 when the electric blower 10 is driven. There is a need to. As the heat insulating member, a foam of natural rubber or synthetic rubber is used. Even in the case of foams of the same material, the heat insulating property varies depending on the density. Therefore, adjustment is necessary according to the heat generated by the switching element 51.
[0030]
6 and 7 show a modification. FIG. 6 is a side view in which a part of an electric blower showing a modification is cut away, and FIG. 7 is a plan view showing a part of the internal configuration. In the present embodiment described above, the switching element 51 is arranged on the flat surface portion (flange portion 46) formed by the step in consideration of the mounting property, the cooling efficiency, etc., but the influence of the heat generated from the stator 24. If it pays attention to the point which can be cooled efficiently without receiving, as an outer surface of electric blower 10 which is not covered with support body 32 on the suction side from motor part 22, for example, in FIG. As shown, the fan cover 23 may be disposed on the outer peripheral surface having a large diameter.
[0031]
A second embodiment of the present invention will be described with reference to FIGS. The same parts as those shown in the first embodiment are denoted by the same reference numerals, and the description thereof is also omitted (the same applies to the embodiments described later).
[0032]
FIG. 8 is a side view showing a part of the configuration of the electric blower of the present embodiment, and FIG. 9 is a plan view showing an example of a part of the internal configuration.
[0033]
The present embodiment basically conforms to the first embodiment described above, but in this embodiment, a motor case 61 is used instead of the motor case 27. Here, the motor case 61 of the present embodiment is configured such that the fan cover 23 side opens as an opening 62 and the main motor case 63 that houses the motor unit 22 and the opening 62 side of the main motor case 63 are closed. The main motor case 63 is connected to the fan cover 23 by a screw 64 or the like and is connected to the fan cover 23. The sub motor case 65 includes the fan cover 23 in the main motor case 63. A plurality of ventilation holes 66 for communicating with each other are formed in a sector shape as shown in FIG. 8, for example. In addition, a bearing housing portion 31a that protrudes in a substantially cylindrical shape toward the front, houses the bearing 30a on the inner peripheral side thereof, and has a through hole 38 for the rotor shaft 29 is formed at a substantial center of the sub motor case 65. Is provided.
[0034]
In such a configuration, in the present embodiment, the outer peripheral portion 67 of the sub motor case 65 having a diameter larger than that of the main motor case 63 passes through the flow path 58 between the discharge port 47 of the centrifugal fan 21 and the motor portion 22. To form. And the switching element 51 as a power device is arrange | positioned and fixed to the outer surface of the outer peripheral part 67 which is not covered with the support body 32 with the screw 57. FIG.
[0035]
Therefore, also in the case of the present embodiment using the outer peripheral portion 67 of the sub motor case 65, the same operation and effect as in the case of the first embodiment using the flange portion 46 can be achieved.
[0036]
A third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a side view showing the configuration of the electric blower used in the present embodiment with a part cut away, FIG. 11 is a plan view showing a part of the internal configuration, and FIG. 12 shows a driving circuit of the vacuum cleaner. It is a schematic circuit diagram.
[0037]
This embodiment is basically the same as the first embodiment, but in this embodiment, an application example in which a brushless motor 70 is used instead of the brushed motor 22 is shown.
[0038]
First, a configuration example of a drive control system including a drive circuit when the brushless motor 70 is used will be described with reference to FIG. In the present embodiment, the electric blower 73 composed of the brushless motor 70 is rotationally driven by an alternating current generated from an inverter drive circuit 72 that is driven using the direct current power source 71 as a drive source. The vacuum cleaner control unit 74 that controls the driving of the electric blower 73 and the drive circuits 75a to 75f are connected to perform switching control of the switching elements 76a to 76f that are power devices such as power MOSFETs that constitute the inverter drive circuit 72. Details of each part will be described below.
[0039]
The DC power supply unit 71 is a battery pack obtained by combining a plurality of secondary batteries such as a nickel cadmium (NiCd) battery, a nickel hydride battery, or a lithium ion battery, or a rectified and smoothed commercial AC power supply. This DC voltage is supplied to the inverter drive circuit 72.
[0040]
The inverter drive circuit 72 has a configuration in which six switching elements 76a to 76f are connected in a three-phase bridge. These switching elements 76a to 76f are driven by the high voltage side drive circuits 75a to 75c and the low voltage side drive circuits 75d to 75f based on the pulse signal output from the vacuum cleaner control unit 74 mainly composed of the microcomputer 77. Then, the alternating current is supplied to the Y-connection windings 78 a to 78 c of the electric blower 73.
[0041]
Further, the vacuum cleaner control unit 74 includes a hand operating unit 79 for selecting start, stop or electric power of the electric blower 73, current detection means 80 for detecting a current flowing through the inverter drive circuit 72, and an input voltage. An input voltage detecting means 81 for detecting is connected.
[0042]
Further, the vacuum cleaner control unit 74 is connected to a position detection means 84 for detecting the permanent magnet position of the rotor 83 surrounded by the stator 82. As such a position detection means 84, three magnetic sensors installed at an electrical angle interval of 120 ° are used. Examples of the magnetic sensor include a hall sensor and a hall IC. As other permanent magnet position detection methods, a method using an optical pulse encoder (not shown), a method of detecting voltages induced in the windings 78a to 78c by a voltage phase detection means, and the like can be used. is there.
[0043]
In such a configuration, the plurality of switching elements 76a to 76f, which are power devices, are mounted on the circuit board 85, and are not covered with the support body 32 on the suction side from the motor unit 22 by screws 86 or the like. As an outer surface position of the electric blower 73, it is disposed and fixed on the outer surface of the flange portion 46 of the motor case 27. In this case, unlike a single switching element 51, a plurality of switching elements 76a to 76f are targeted. However, as shown in FIG. 11, these switching elements 76a to 76f are provided with a rotor shaft 29 of a brushless motor 70. They are arranged radially at equal intervals so as to be located on substantially the same circumference (not strictly on the same circumference) at the center.
[0044]
By adopting such a mounting arrangement structure of the switching elements 76a to 76f, the switching elements 76a to 76f can be made without increasing the air path loss of the electric blower 73, as in the case of the first embodiment. It can be cooled effectively. In particular, when the brushless motor 70 as in the present embodiment is driven, a plurality of switching elements are required, and the plurality of switching elements 76a to 76f can be used without increasing the flow path loss of the electric blower 73. The present embodiment that can be effectively cooled is particularly effective. Further, since the plurality of switching elements 76a to 76f are arranged radially on the rotor shaft 29 around the same circumference, the variation in cooling of the switching elements 76a to 76f is reduced. Therefore, it is effective in cooling evenly, and the operation of the switching elements 76a to 76f, and hence the circuit operation can be stabilized.
[0045]
Although the present embodiment has been described as an application example to the first embodiment, the second embodiment using the sub motor case 65 can be similarly applied.
[0046]
In these embodiments, the switching devices 51 and 76a to 76f such as triacs and power MOSFETs have been described as examples of power devices. However, the present invention is not limited to these devices, and those that generate heat when driven, for example, IGBT ( Switching elements such as Insulated Gate Bipolar Transistors are also applicable, or are not limited to these elements alone, but are also applicable to those packaged or deviceized on a single chip, and also applicable to resistance elements Can be.
[0047]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the electric vacuum cleaner of the structure which can cool efficiently power devices, such as a switching element, can be provided, without increasing the air path loss of an electric blower.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing an internal configuration of a vacuum cleaner according to a first embodiment of the present invention.
FIG. 2 is a side view showing a part of the configuration of the electric blower.
FIG. 3 is a plan view showing an example of a part of the internal configuration.
FIGS. 4A and 4B are a plan view and a bottom view showing a configuration example of a diffuser. FIGS.
FIG. 5 is a schematic circuit diagram showing a drive circuit of the electric blower.
FIG. 6 is a side view showing a modified electric blower with a part cut away.
FIG. 7 is a plan view showing an example of a part of the internal configuration.
FIG. 8 is a side view showing a partially cutaway configuration of an electric blower according to a second embodiment of the present invention.
FIG. 9 is a plan view showing an example of a part of the internal configuration.
FIG. 10 is a side view showing a part of the configuration of an electric blower according to a third embodiment of the present invention.
FIG. 11 is a plan view showing an example of a part of the internal configuration.
FIG. 12 is a schematic circuit diagram showing a configuration example of a control system of the electric vacuum cleaner.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Electric blower 11 Electric blower chamber 21 Centrifugal fan 22 Motor part 23 Fan cover 27 Motor case 32 Support body 39 Diffuser 46 Plane part 51 Power device 61 Motor case 76 Power device

Claims (6)

An electric blower having a motor unit and a centrifugal fan attached to the rotating shaft of the motor unit, an electric blower chamber for housing the electric blower, a drive circuit for driving the electric blower, and suction of the electric blower A vacuum cleaner provided with a support body mounted on the outer peripheral side,
The support is brought into contact with the wall of the electric blower chamber, and the power device in the drive circuit is arranged on the suction side of the motor unit on the outer surface of the electric blower that is not covered by the support. A vacuum cleaner characterized by that. A motor case of the motor unit, and a case having a fan cover that is larger in diameter than the motor case and covers the centrifugal fan;
2. The electric vacuum cleaner according to claim 1, wherein the power device is disposed on a flat surface formed by a step between the motor case and the fan cover having a large diameter. A diffuser that rectifies the airflow from the outlet of the centrifugal fan toward the motor unit;
The vacuum cleaner according to claim 2, wherein the power device is disposed at a portion facing the diffuser. 2. The vacuum cleaner according to claim 1, wherein the support is formed of a vibration absorbing member. The vacuum cleaner according to claim 1, wherein the support is formed of a heat insulating member. The vacuum cleaner according to claim 1, wherein the support is formed of a heat resistant member.

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