JP2000316768A - Electric vacuum cleaner - Google Patents

Abstract

(57) [Summary] [Object] To provide an electric vacuum cleaner in which the life of a nozzle motor is less reduced. SOLUTION: The operation of the overheat prevention means 2 is determined by detecting the value of a current flowing through the electric blower 4 by a current detection means 8, and the current to the electric blower 4 is reduced when the overheat prevention means 2 is operated. When the electric blower 4 is shut down and stopped, the current supply to the nozzle motor 6 is stopped to stop the nozzle motor 6. The nozzle motor 6 does not continue to rotate without cooling air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner using an electric blower with built-in overheating prevention means.

[0002]

2. Description of the Related Art (Conventional Example 1) A configuration of a control circuit of a vacuum cleaner according to a first conventional example will be described with reference to FIGS.

The electric blower 4 provided in the cleaner body 12
A temperature control device for controlling the electric blower 4; a floor nozzle on the primary side of the temperature control device 2. 13 is provided with the electric motor 4
Are connected in parallel with each other, and an operation switch 9 provided on a hand operation unit 14 is connected to the control device 3.
By operating the operation switch 9, the electric blower 4
In addition, the operation mode is switched by supplying power to the nozzle motor 6, shutting off the current, and adjusting the current. The overheating prevention means 2 and the control device 3 are built in the main body 12, and are electrically connected to the nozzle motor 6 and the operation switch 9 via a hose 15 and an extension pipe 16.

(Conventional Example 2) A control circuit of a vacuum cleaner according to a second conventional example will be described with reference to FIGS. 2 and 5. FIG.
Note that the same components as those in Conventional Example 1 are denoted by the same reference numerals, and description thereof will be omitted.

The electric blower 4 provided in the cleaner body 12
An excessive temperature rise prevention means 2 which is built in the electric blower 4 and shuts off energization of the electric blower 4 when the temperature rises excessively, and a control device 3 which controls the electric blower 4. And the floor nozzle 1 in parallel with the electric blower 4.
3 is connected to a nozzle motor 6, and the control device 3 further includes an operation switch 9 provided on a hand operation unit 14.
Was connected.

[0006]

In the vacuum cleaner according to the prior art 1, since the electric blower and the means for preventing overheating are separate parts, the means for preventing overheating are provided outside the outer shell of the electric blower. Because the temperature of the coil of the electric blower cannot be measured accurately, depending on the ambient conditions, the overheating prevention means operates when the temperature of the coil is low, or the temperature is aimed at. Even if it becomes the above, the overheating prevention means does not work, and there is a possibility that the life of the electric blower is shortened or the performance is deteriorated. Furthermore, assembly is complicated due to the large number of parts.

In the conventional vacuum cleaner, the temperature of the coil of the electric blower can be accurately measured by providing the over-temperature preventing means in the electric blower. The current to the electric blower is cut off when the over-elevation prevention means operates, but the current to the nozzle motor is still supplied, so that the nozzle motor is in a state where there is no cooling air generated by driving the electric blower. , The rotation of the nozzle motor may be continued, and as a result, the life of the nozzle motor may be shortened or the performance may be deteriorated.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a highly reliable vacuum cleaner in the operation of the means for preventing excessive temperature rise.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an electric blower, a nozzle motor provided on a floor nozzle, and means for preventing overheating of the electric blower when the temperature rises. A current detecting means for detecting a current flowing through the electric blower; and a control device for controlling the electric blower and the nozzle motor in accordance with an output of the current detecting means, wherein the control device outputs the current of the current detecting means. In response to the above, the current to the nozzle motor is stopped, and when the overheat prevention means operates, the current to the electric blower is cut off and the electric blower is stopped. In order to stop the current supply and stop the nozzle motor, even if the excessive temperature rise prevention means is built in the electric blower, the nozzle motor is in a state where there is no cooling air. Since the rotation does not continue, it is possible to accurately measure the temperature of the coil of the electric blower, to prevent a reduction in the life and performance of the electric blower due to operation at a high temperature, and at the same time to simplify the assembly by reducing the number of parts, In addition, it is possible to prevent a reduction in the life of the nozzle motor and a deterioration in performance due to operation at a high temperature.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION
An electric blower, a nozzle motor provided on a floor nozzle, an excessive temperature rise prevention means for cutting off the energization of the electric blower when the temperature rises excessively, a current detection means for detecting a current flowing through the electric blower, and the current detection means A control device that controls the electric blower and the nozzle motor according to the output of
The control device is configured to stop energization of the nozzle motor in accordance with an output of the current detection unit. When the excessive temperature rise prevention unit operates, the current to the electric blower is interrupted, and When the blower stops, the current supply to the nozzle motor is stopped to stop the nozzle motor, so that even if the overheating prevention means is incorporated in the electric blower, the nozzle motor is in a state where there is no cooling air. Since the rotation is not continued, the temperature of the coil of the electric blower is accurately measured, and it is possible to prevent a reduction in the life and performance of the electric blower due to operation at a high temperature, and at the same time to simplify the assembly by reducing the number of parts, In addition, it is possible to prevent a reduction in the life of the nozzle motor and a deterioration in performance due to operation at a high temperature.

According to a second aspect of the present invention, there is provided an electric blower, a nozzle motor provided on a floor nozzle, an excessive temperature rise prevention means for shutting off energization of the electric blower when the temperature rises excessively,
A current detector that detects a current flowing through the electric blower; and a controller that controls the electric blower and the nozzle motor in accordance with an output of the current detector, wherein the controller is configured to respond to an output of the current detector. Thus, the vacuum cleaner reduces the rotation speed of the nozzle motor. The vacuum cleaner can notify the user of the occurrence of an abnormality due to the reduction in the rotation speed of the nozzle motor, and can prompt an appropriate response.

According to a third aspect of the present invention, there is provided an electric blower drive circuit for controlling the energization of the electric blower in accordance with a control signal from the control device, and the control device has an overheating prevention means operating. 3. The electric vacuum cleaner according to claim 1, wherein the control signal to the electric blower drive circuit is stopped when the control unit determines that the temperature is too high. By
Wasteful power consumption can be suppressed.

According to a fourth aspect of the present invention, there is provided an electric blower driving circuit for controlling energization of an electric blower in accordance with a control signal from a control device, and controlling energization of a nozzle motor in accordance with a control signal from the control device. 2. A nozzle motor driving circuit, wherein the control device stops a control signal to the electric blower driving circuit and a control signal to the nozzle motor driving circuit when the control device determines that the over-temperature preventing means is operating. The electric vacuum cleaner according to any one of the preceding claims, wherein a control signal to the electric blower driving circuit and the nozzle motor driving circuit is stopped during the operation of the overheating prevention means, so that useless power consumption can be suppressed.

According to a fifth aspect of the present invention, there is provided an operation switch for driving the nozzle motor, and the control device causes the nozzle motor to operate normally when the overheat prevention means is restored and the operation switch is operated. The motor is driven at a rotation speed.
Or the vacuum cleaner according to 2, wherein the nozzle motor is rotated after confirming the return of the excessive temperature rise prevention means,
When the operation is performed during the operation of the excessive temperature rise prevention means,
It is intended to prevent the user from feeling uncomfortable by driving only the nozzle motor.

According to a sixth aspect of the present invention, there is provided the electric vacuum cleaner according to any one of the first to fifth aspects, wherein an alarm is issued by an alarm means when the excessive temperature rise prevention means operates. By notifying that the ascending prevention means is being operated, the user can correctly recognize the state of the vacuum cleaner, and the coping method can be clarified using the mediation means such as a manual.

[0016]

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIGS. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

An electric blower 4 with built-in over-temperature prevention means 2 for interrupting the current when a predetermined temperature is reached, an electric blower driving circuit 5, and a current detecting means 8 for detecting the current flowing through the electric blower 4 are connected in series. And the nozzle motor 6
And the nozzle motor drive circuit 7 connected in series are connected in parallel to the commercial power supply 1, and further send control signals to the electric blower drive circuit 5 and the nozzle motor drive circuit 7,
It has a signal processing unit 11 for supplying and shutting off the electric current to the electric blower 4 and the nozzle motor 6, and the signal processing unit 11 further includes the operation, stop, and operation modes of the current detection unit 8 and the cleaner. The operation switch 9 for performing the changeover and the notification means 10 for notifying the operation of the excessive temperature rise prevention means 2 are connected. The electric blower 4, the electric blower drive circuit 5, the nozzle motor drive circuit 7, the current detection means 8, the notification means 10, and the signal processing unit 11 are all built in the main body 12, and the floor nozzle 13
Is connected to the nozzle motor 6 and the operation switch 9 built in the hand operation unit 14 via a hose 15 and an extension pipe 16.

The operation in the above configuration will be described with reference to FIG.

If the current flowing through the electric blower 4 detected by the current detecting means 8 in step 1 is 0.5 V or less, it is determined that the overheat prevention means 2 has operated and the electric blower driving circuit 5 is operated. And stopping the control signal sent to the nozzle motor drive circuit 7 to stop the current supply to the electric blower 4 and the nozzle motor 6, stop the electric blower 4 and the nozzle motor 6, and notify the notifying means. Notification is performed by 10. Next, in step 2, it is determined whether or not the operation switch 9 has been pressed.
If any switch is pressed, step 3 determines what the pressed switch was, and if it is a "Carpet" switch, sets a flag. Here, the “Carpet” switch is a switch for driving both the electric blower 4 and the nozzle motor 6.

Next, in step 4, a control signal is sent to the electric blower driving circuit 5 for 0.5 second, and the current flowing through the electric blower 4 becomes 0.5 V or more in step 5 while the control signal is being sent. It is determined whether or not the temperature reaches 0.5 V or more. If it is 0.5 V or more, it is determined that the excessive temperature rise prevention means 2 has returned. After the overheat prevention means 2 is judged to be returning, if the flag is set, the control signal is sent to the nozzle motor drive circuit 7 to drive the nozzle motor and then the notification means 10 The notification is ended, and if the flag is not set, the notification by the notification means 10 is ended as it is. In the present invention, it is determined that the excessive temperature rise prevention means 2 is operated in step 1 and the control signal sent to the nozzle motor drive circuit 7 is not stopped, and the number of revolutions of the nozzle motor 6 is reduced. Corresponds to the embodiment of claim 2.

The operation of the above configuration is as follows.

Even if the excessive temperature rise prevention means 2 is incorporated in the electric blower 4, the nozzle motor 6 does not continue to rotate without cooling air.
The temperature of the coil can be accurately measured to prevent a reduction in the life and performance of the electric blower 4 due to operation at a high temperature, at the same time as simplifying the assembly by reducing the number of parts, and to improve the operation of the nozzle motor 6 at a high temperature. Can be prevented from shortening the service life and deteriorating performance. Further, when the excessive temperature rise prevention means 2 operates, the control signal to the electric blower drive circuit 5 is also stopped, so that wasteful power consumption can be suppressed.

Further, only when the operation switch 9 is pressed, a control signal is sent to the electric blower driving circuit 5 to check whether or not the overheat prevention means 2 has been restored. The normal operation is performed after the return of the excessive temperature rise prevention means 2 while suppressing the temperature. Further, when the operation switch 9 for driving the nozzle motor 6 is pressed, the nozzle motor 6 is rotated after confirming the return of the overheating prevention means 2.
During the return confirmation, only the nozzle motor 6 is driven to prevent the user from feeling uncomfortable. Further, during the period from the time when the overheating prevention means 2 operates to the time when the overheating prevention means 2 is confirmed to be restored, the user is notified of the fact so that the user can correctly recognize the state of the vacuum cleaner, The coping method can be clarified using an intermediary means such as.

[0024]

According to the first aspect of the present invention,
When the overheating prevention means operates, the nozzle motor is stopped, so that even if the overheating prevention means is incorporated in the electric blower, the nozzle motor does not continue to rotate in the absence of cooling air. The temperature of the coil of the electric blower can be accurately measured to prevent the life and performance of the electric blower from being shortened due to operation at a high temperature. At the same time, the number of parts can be reduced to simplify the assembly, and the nozzle motor can be operated at high temperature. Can be prevented from shortening the service life and deteriorating performance.

According to the second aspect of the present invention, when the excessive temperature rise prevention means operates, the number of rotations of the nozzle motor is reduced to notify the user of the occurrence of an abnormality and to take appropriate action. You can encourage response.

According to the third aspect of the present invention, unnecessary power consumption can be suppressed by stopping the control signal to the electric blower drive circuit when the excessive temperature rise prevention means operates.

According to the fourth aspect of the present invention, not only the electric blower driving circuit but also the control signal to the nozzle motor driving circuit are stopped during the operation of the excessive temperature rise prevention means, thereby wasting electric power. Consumption can be reduced.

According to the fifth aspect of the present invention, the nozzle motor is rotated after confirming the return of the overheating prevention means. Therefore, when the operation is performed during the operation of the overheating prevention means, It is intended to prevent the user from feeling uncomfortable by driving only the nozzle motor.

According to the invention of claim 6 of the present invention, a notification is given to the user from the time when the overheat prevention means operates to the time when the return of the overheat prevention means is confirmed. The state of the vacuum cleaner can be correctly recognized, and the coping method can be clarified using an intermediary means such as a manual.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a vacuum cleaner showing an embodiment of the present invention.

FIG. 2 is an overall view of the vacuum cleaner.

FIG. 3 is a flowchart of a main part of the vacuum cleaner.

FIG. 4 is a block circuit diagram of a vacuum cleaner showing a first conventional example.

FIG. 5 is a block circuit diagram of a vacuum cleaner showing a second conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Commercial power supply 2 Temperature rise prevention means 3 Controller 4 Electric blower 5 Electric blower drive circuit 6 Nozzle motor 7 Nozzle motor drive circuit 8 Current detection means 9 Operation switch 10 Notification means 11 Signal processing part 12 Main body 13 Floor nozzle 14 Hand operation Part 15 Hose 16 Extension tube

Claims (6)

[Claims] 1. An electric blower, a nozzle motor provided on a floor nozzle, an excessive temperature rise preventing means for cutting off the current supply to the electric blower when the temperature rises excessively, and a current detecting means for detecting a current flowing through the electric blower. A controller for controlling the electric blower and the nozzle motor in accordance with an output of the current detecting means, wherein the controller stops power supply to the nozzle motor in accordance with an output of the current detecting means. Machine. 2. An electric blower, a nozzle motor provided on a floor nozzle, an excessive temperature rise prevention means for cutting off the energization of the electric blower when the temperature rises excessively, and a current detecting means for detecting a current flowing through the electric blower. A control device for controlling the electric blower and the nozzle motor according to the output of the current detection means, wherein the control device reduces the rotation speed of the nozzle motor according to the output of the current detection means. Machine. 3. An electric blower driving circuit for controlling energization of the electric blower in response to a control signal from a control device, wherein the control device determines that the overheating prevention means is operating, and the electric blower driving circuit The vacuum cleaner according to claim 1 or 2, wherein a control signal to the vacuum cleaner is stopped. 4. An electric blower drive circuit for controlling energization of an electric blower in accordance with a control signal from a control device, and a nozzle motor drive circuit for controlling energization of a nozzle motor in accordance with a control signal from the control device, 2. The electric vacuum cleaner according to claim 1, wherein the device stops the control signals to the electric blower driving circuit and the nozzle motor driving circuit when the device judges that the excessive temperature rise prevention means is operating. 5. The control device according to claim 1, further comprising an operation switch for driving the nozzle motor, wherein the control device drives the nozzle motor at a normal rotation speed when the overheat prevention means is restored and the operation switch is operated. 2. The vacuum cleaner according to 2. 6. The electric vacuum cleaner according to claim 1, wherein when the excessive temperature rise prevention unit operates, the notification unit issues a notification.