JP2010252958A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a user from receiving electric shock when the user disconnects a power plug and touches its blades during operation of a thermo protector in a vacuum cleaner. <P>SOLUTION: The vacuum cleaner includes: an electric blower 1 which is serially connected with the thermo protector (an overtemperature prevention device) 5 adapted to cut off a current when a stator reaches an abnormal temperature, at the outside of one field winding (a stator winding) 3 and has an intermediate terminal 19 between the one field winding 3 and the thermo protector 5; a noise prevention capacitor 6 for reducing electrical noise generated by the blower 1; and a mechanical switch 7 provided at a power supply side with respect to the noise prevention capacitor 6, for turning on/off the power to the electric blower 1. One end of the noise prevention capacitor 6 is connected to the intermediate terminal 19, and the other end is connected to the other end of the electric blower 1 at the other side with respect to an armature (a rotor) 2. This constitution can prevent the user from receiving the electric shock during the operation of the thermo protector 5 even if touching the blades of the power plug. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a thermo protector used for an electric blower and an electric vacuum cleaner provided with a noise prevention capacitor for reducing electric noise of the electric blower.

  The configuration of the electric blower used in the conventional technology and the electric vacuum cleaner will be described with reference to FIGS. 4 is an external view of a conventional vacuum cleaner, FIG. 5 is a cross-sectional view of the main body of the vacuum cleaner, and FIG. 6 is a circuit diagram of the vacuum cleaner. There is a dust collection chamber 17 in the front of the vacuum cleaner body 15 and a motor chamber 18 in the rear. The motor chamber 18 is provided with the electric blower 1 that generates suction force. Is provided with a dust bag 9. A hose 11, an extension pipe 12, and a nozzle 13 are provided on the outer front side of the electric vacuum cleaner main body 15. In addition to this, the vacuum cleaner main body 15 has a mechanical switch 7, a cord 10, a cord reel 20 that winds the cord, and the electric blower 1 is prevented from being burned due to heat generation when the dust collection is full. For this purpose, a pressure on / off valve 14 is provided.

  In FIG. 6, the electric blower 1 includes an armature 2, a field winding 3, a carbon brush 4 that supplies power from the field winding 3 to the armature 2, and a field winding 3 on one side. On the outside, a thermo protector (overheat prevention device) 5 is formed, and terminals 8 are formed at both ends thereof. A noise prevention capacitor 6 is provided in parallel with the electric blower 1, and a mechanical switch 7 is connected in series to the outside thereof. After that, it is connected to a commercial power source via a cord 10 (not shown) and a power plug 16 (not shown).

  The operation of the vacuum cleaner configured as described above will be described. When the power plug 16 is inserted into a commercial power source (outlet) and the mechanical switch 7 is turned on, a current flows through the electric blower 1 and the noise preventing capacitor 6, and the armature 2 rotates. Thereby, a suction force is generated, and dust is guided to the vacuum cleaner body 15 through the nozzle 13, the extension pipe 12 and the hose 11 together with the air flow. The dust reaching the vacuum cleaner body 15 is rubbed by the dust bag 9 and only the air flow is guided to the electric blower 1. Thereafter, the air flow cools the armature 2, the field winding 3, the carbon brush 4, and the like inside the electric blower 1, and is discharged from the rear part of the vacuum cleaner main body 15. The noise preventing capacitor 6 has an effect of suppressing electric noise generated from the electric blower 1 during operation of the vacuum cleaner.

  Furthermore, when dust is continuously sucked in and the dust bag 9 is full, the vacuum pressure in the dust collection chamber 17 is increased, the pressure on / off valve 14 is activated, and the outside air enters the dust collection chamber 17. Thereby, since the cooling air enters the electric blower 1, the electric blower 1 is cooled. If the state continues further, the temperature of the electric blower 1 rises, and this time, the thermo protector 5 operates, the power supply to the electric blower 1 is forcibly cut off, and the safety of the electric vacuum cleaner is maintained. Designed. However, when the thermo-protector is operated, if the user unplugs the power plug 16 of the vacuum cleaner and touches both plug blades of the plug 16 unexpectedly, the user receives an electric shock due to the electric charge stored in the noise preventing capacitor 6. There was a possibility (see, for example, Patent Document 1).

JP-A-4-317617

  In view of the above-described problems of the conventional example, the present invention provides a vacuum cleaner having an electric blower equipped with a thermo protector. An object is to provide a user-friendly vacuum cleaner that is not shocked.

  In order to solve the above-described conventional problems, the vacuum cleaner of the present invention has a fan, a rotor, and a stator, and when the stator reaches an abnormal temperature outside one stator winding, An electric blower that includes an intermediate terminal between the stator winding and the overheat prevention device, and an electric blower that is integrally configured by connecting an overtemperature prevention device that interrupts current to the stator in series. A noise prevention capacitor for reducing electrical noise, and a mechanical switch for turning on and off the electric power to the electric blower on the power source side from the noise prevention capacitor, one end of the noise prevention capacitor being connected to the intermediate Since the other end is connected to the other terminal of the electric blower with the rotor in between, the potential at both ends of the noise prevention capacitor is connected to the power supply during the operation of the thermo protector. It never appears in the plug blade grayed, can provide a vacuum cleaner which can be used the user with peace of mind.

  ADVANTAGE OF THE INVENTION According to this invention, the safer vacuum cleaner which prevents a user's electric shock in the limited conditions during operation of the overheat prevention device can be provided.

External view of the vacuum cleaner which shows the 1st Embodiment of this invention Cross section of the vacuum cleaner body Circuit diagram of the vacuum cleaner External view of conventional vacuum cleaner Cross-sectional view of a conventional vacuum cleaner Circuit diagram of conventional vacuum cleaner

  A first invention has a fan, a rotor, and a stator, and an overtemperature prevention device that cuts off current to the rotor or stator when the stator reaches an abnormal temperature outside one stator winding. Are connected in series to form an integral unit, and an electric blower having an intermediate terminal between the stator winding and the overtemperature prevention device, and a noise prevention capacitor for reducing electrical noise generated by the electric blower A mechanical switch for turning on and off the power to the electric blower on the power supply side of the noise prevention capacitor, one end of the noise prevention capacitor is connected to the intermediate terminal, and the other end sandwiches the rotor Since it is connected to the other terminal of the electric blower, the potential of both ends of the noise prevention capacitor does not appear on the plug blade of the power plug during operation of the thermo protector, and the user is safe. It is possible to provide a vacuum cleaner that can be used in.

  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. The same components as those in the conventional example are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 1 is an external view of a vacuum cleaner according to the first embodiment of the present invention, FIG. 2 is a sectional view of the main body of the vacuum cleaner, and FIG. 3 is a circuit diagram of the vacuum cleaner.

  In FIG. 3, a commutator motor generally used in a vacuum cleaner will be described as an example. The electric blower 1 includes an armature (rotor) 2, a field winding (stator winding) 3, and a field magnet. The carbon brush 4 that supplies power from the winding 3 to the armature 2 and the outside of the field winding 3 on one side are composed of a thermo protector (overheat prevention device), and terminals 8A and 8B are formed at both ends thereof. Has been. Further, an intermediate terminal 19 is provided between one field winding 3 and the thermo protector 5, and one end of a noise preventing capacitor 6 is connected thereto. The other end of the noise preventing capacitor 6 is connected to a portion having the same polarity as that of 8A across the armature 2. A mechanical switch 7 is connected in series to the outside (power supply side). After that, it is connected to a commercial power source via a cord 10 (not shown) and a power plug 16 (not shown).

  The operation of the vacuum cleaner configured as described above will be described. When the power plug 16 is inserted into a commercial power source (outlet) and the mechanical switch 7 is turned on, a current flows through the electric blower 1 and the noise preventing capacitor 6, and the armature 2 rotates. Thereby, a suction force is generated, and dust is guided to the vacuum cleaner body 15 through the nozzle 13, the extension pipe 12 and the hose 11 together with the air flow. The dust reaching the vacuum cleaner body 15 is rubbed by the dust bag 9 and only the air flow is guided to the electric blower 1. Thereafter, the air flow cools the armature 2, the field winding 3, the carbon brush 4, and the like inside the electric blower 1, and is discharged from the rear part of the vacuum cleaner main body 15. The noise preventing capacitor 6 has an effect of suppressing electric noise generated from the electric blower 1 during operation of the vacuum cleaner.

  Furthermore, when dust is continuously sucked in and the dust bag 9 is full, the vacuum pressure in the dust collection chamber 17 is increased, the pressure on / off valve 14 is activated, and the outside air enters the dust collection chamber 17. Thereby, since the cooling air enters the electric blower 1, the electric blower 1 is cooled. If the state continues further, the temperature of the electric blower 1 rises, and this time, the thermo protector 5 operates, the power supply to the electric blower 1 is forcibly cut off, and the safety of the electric vacuum cleaner is maintained. Designed. Even if the user unplugs the power plug 16 of the vacuum cleaner and touches both the blades of the plug 16 unexpectedly when the thermo protector is in operation, the potential stored in the noise prevention capacitor 6 is not applied to the thermo protector 5. At that time, it does not appear on the plug blade of the power plug 16 and does not receive an electric shock.

  In addition, although such a circuit structure can be implement | achieved even if it isolate | separates the thermo protector 5 from the inside of the electric blower 1, and it attaches outside the electric blower 1 independently, the thermo protector 5 is a heat source of the electric blower 1. There is an advantage that the thermal responsiveness can be improved by attaching it as close to the winding part as possible. Therefore, this invention provides the vacuum cleaner which also has the safety | security with respect to an electric shock with respect to what equipped the thermo protector 5 in the inside of the electric blower.

  In addition, the present invention can provide greater safety performance for a vacuum cleaner for a region having a high power supply voltage (200V system).

  As described above, according to this embodiment, it is possible to provide a user-friendly electric vacuum cleaner that can prevent an electric shock of the user when the thermoprotector is operated.

  As described above, since the vacuum cleaner according to the present invention can improve safety during operation of the safety device, it can be widely applied to household appliances, industrial equipment, and the like using an electric blower.

1 Electric blower 2 Armature (rotor)
3 Field winding (stator winding)
4 Carbon brush 5 Thermo protector (overheat prevention device)
6 Capacitor for Noise Prevention 7 Mechanical Switch 8A Terminal 8B Terminal 9 Dust Collection Bag 10 Cord 11 Hose 12 Extension Pipe 13 Nozzle 14 Pressure On / Off Valve 15 Vacuum Cleaner Body 16 Power Plug 17 Dust Collection Chamber 18 Motor Chamber 19 Intermediate Terminal 20 Cord reel

Claims (1)

A fan, a rotor, and a stator are provided, and an overtemperature prevention device that interrupts current to the rotor or the stator when the stator reaches an abnormal temperature is connected in series outside the stator winding. An electric blower configured integrally and having an intermediate terminal between the stator winding and the overtemperature prevention device, a noise prevention capacitor for reducing electrical noise generated by the electric blower, and the noise prevention capacitor A mechanical switch for turning on and off the electric power to the electric blower on the power source side, one end of the noise prevention capacitor connected to the intermediate terminal, and the other end of the electric blower sandwiching the rotor A vacuum cleaner connected to the terminal.

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