JP2000201871A - Electric vacuum cleaner - Google Patents

Abstract

(57) [Problem] To provide a vacuum cleaner capable of easily avoiding sticking and sucking and reliably preventing overheating of an electric blower. SOLUTION: An electric blower room accommodating the electric blower 11 in a main body case and a dust collection chamber are formed in a compartment. Electric blower 11
And an air flow detecting means 13 for detecting a suction air flow generated by driving the electric blower 11 at an intake side of the air blower. During cleaning, the suction air volume is reduced due to abnormal conditions such as paper sticking or sticking to a suction port connected to the main body case via a hose and an extension pipe. The timer 14 counts the time when it recognizes that the air volume is smaller than the predetermined suction air volume. If it is determined that the state of the small air volume is continued even after the lapse of the predetermined time, it is determined that the dust is not clogged or sucked to avoid when the input of the electric blower 11 is once reduced and the dust is clogged, and the electric blower 11 is stopped. It is possible to reliably prevent the electric blower 11 from being overheated by driving with a reduced input in a dust-clogged state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner for controlling the operation of an electric blower based on the amount of air to be sucked.

[0002]

2. Description of the Related Art Conventionally, as a vacuum cleaner of this type, for example, a structure described in Japanese Patent Application Laid-Open No. 4-197326 is known.

[0003] The electric vacuum cleaner described in Japanese Patent Application Laid-Open No. 4-197326 drives an electric blower disposed in a main body case during cleaning, and sucks air together with dust from a hose connected to the main body case to thereby generate electric power. Dust is captured in a dust collection chamber defined on the negative pressure side of the blower. At the time of this cleaning, the amount of air to be sucked by the electric blower is detected to be less than a predetermined value by detecting the amount of air sucked by the electric blower by the detecting means, and by sticking paper or the like to the hose or sticking the hose to the cleaning surface. If the low airflow condition continues for a predetermined time or more, the input of the electric blower is reduced to a predetermined input value to prevent damage due to overheating of the electric blower, and it is easy to stick and suck To be released.

[0004]

However, in the vacuum cleaner described in Japanese Patent Laid-Open No. 4-197326,
Since only the input of the electric blower is reduced when the air volume to be sucked is reduced to a small air volume state, distinction is made between avoiding sticking and suction and preventing the electric blower from overheating, and according to each state. Not properly controlled. That is, for example, sticking and sucking can be avoided by reducing the input of the electric blower, but the input of the electric blower is reduced even in a state where the amount of air to be sucked is extremely small due to a full dust collection state where the amount of collected dust is full. Since only the electric blower is driven in a state where the input is reduced, overheating of the electric blower may not be reliably prevented.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a vacuum cleaner capable of easily avoiding sticking and sucking and reliably preventing overheating of an electric blower. .

[0006]

The vacuum cleaner of the present invention comprises:
A main body accommodating the electric blower, an air flow detecting means for detecting an air flow sucked by the electric blower, and a small air flow state in which a ratio of the air flow detected by the air flow detecting means to the input of the electric blower is equal to or less than a predetermined value. Control means for reducing the input of the electric blower at the same time, and stopping the drive of the electric blower by recognizing that the small air volume state has continued for a predetermined time or more.

The control means reduces the input of the electric blower when the ratio of the input to the electric blower detected by the air flow detection means to the input is less than a predetermined value, and reduces the input of the electric blower for a predetermined time. If the air blower continues, the drive of the electric blower will be stopped.For example, if the air volume becomes low, the air blower will stick or suck, and it will be recognized as a dust clogging state, and the input of the electric blower will be reduced once, and the air blower will stick or suck. In this state, these states are avoided, the state is not a small air volume state, and cleaning can be continued. On the other hand, if the low air volume state continues for a predetermined time or longer even if the input of the electric blower is reduced, the state is recognized as a dust clogging state, etc. Overheating of the electric blower due to continuation is reliably prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a vacuum cleaner according to the present invention will be described with reference to the drawings.

In FIG. 2, reference numeral 1 denotes a cleaner main body. The cleaner main body 1 has an electric blower (not shown) disposed in a rear portion thereof, and an auxiliary dust collecting filter provided on a negative pressure side which is an intake side of the electric blower. A main body case 2 as a main body is formed at a front part of a dust collection chamber in which a dust collection bag (not shown) communicating with the dust collection bag is detachably mounted. Further, an air flow detecting means for detecting a suction air flow generated by driving the electric blower is provided between the suction side of the electric blower and the negative pressure side, for example, between the suction side of the electric blower and the auxiliary dust collecting filter. In addition, the air volume detecting means includes, for example, a pressure sensor that detects a negative pressure on the intake side of the electric blower and detects the air volume with the negative pressure, a rotating body that rotates with the intake air and detects the air volume with the rotation speed, and the like.
Either configuration may be used. On the front side of the cleaner main body 1, a substantially cylindrical insertion opening 3 that opens toward the dust collection chamber is formed.

A connection pipe 5 provided at one end of a hose 4 is detachably connected to the insertion port 3 of the cleaner body 1. At the other end of the hose 4, for example, a switch 6a for strong use and a switch 6 for weak use for setting driving of the electric blower are provided.
b, a grip portion 7 provided with an operation means 6 including an automatic switch 6c and a stop switch 6d is provided. Further, a suction port 9 is detachably connected to the grip 7 via an extension tube 8. Then, from the suction opening formed on the lower surface of the suction opening body 9, through the extension pipe 8, the hose 4, the dust collecting bag in the dust collecting chamber in the cleaner main body 1, and the electric blower to the rear part of the cleaner main body 1. An open air passage is formed to communicate with an open exhaust port (not shown).

Next, the internal configuration of the above embodiment will be described with reference to FIG.

An electric blower 11 provided in the cleaner body 1
Are connected to a commercial AC power supply E via a power control triac Tr.

[0013] The gate of the triac Tr is connected to control means 12 provided in the cleaner body 1.

Further, the control means 12 is connected to an operation means 6 disposed on the grip 7 of the hose 4.
By operating the strong switch 6a, the weak switch 6b, the automatic switch 6c, and the stop switch 6d, a predetermined current value is output to the control means 12, and based on this current value, the control means 12 Controls the drive of the electric blower 11.

An air flow detecting means 13 is connected to the control means 12, and recognizes a suction air flow generated by driving the electric blower 11 based on a signal output from the air flow detecting means 13.

Further, the control means 12 includes a timer 14 as time measuring means.

Next, the operation of the above embodiment will be described with reference to the flow chart shown in FIG. 3 and a graph showing the relationship between the negative pressure on the negative pressure side of the electric blower 11 and the suction air volume of the electric blower 11 shown in FIG. .

First, at the time of cleaning, a hose 4 is inserted into the outlet 3.
And the extension pipe 8 and the suction port body 9 are appropriately connected. Then, electric power is supplied through a power cord (not shown), the gripping portion 7 of the hose 4 is gripped, the operating means 6 is appropriately set and operated, and the electric blower 11 is driven as appropriate to perform cleaning.
Here, a case will be described in which the setting operation by the operation means 6 operates the automatic switch 6c.

On the other hand, the control means 12 supplies
It is determined whether a setting operation has been performed on the operation means 6 (step 1). Then, when the control means 12 detects a predetermined current value from the operation means 6 and recognizes a setting operation of driving the electric blower 11 in a predetermined drive state by the operation means 6, the electric blower 11 is operated by the setting operation of the operation means 6. (Step 2). Thereafter, the air flow detecting means 13 detects the intake air flow of the electric blower 11, and determines whether or not a preset air flow, that is, a point A shown in FIG. 4 has been reached (step 3). On the other hand, if the setting operation of the operating means 6 is not recognized in step 1, it is determined whether or not the electric blower 11 is being driven (step 4). It is determined that the setting has been performed, and the process proceeds to step 3. If not, the operation means 6 determines that the setting operation for driving the electric blower 11 has not been performed yet, and returns to step 1.

When the electric blower 11 is driven, for example, the amount of dust that has been sucked in and captured is increased, and the amount of sucked air is gradually reduced, as shown in FIG.
12 gradually increases the input of the electric blower 11. That is, the dust is hardly accumulated and the electric blower 11
When the intake air volume of the air blower is large, the input of the electric
When the amount of dust increases and the amount of suction air decreases, the input of the electric blower 11 is controlled as shown in the range c in FIG.
The control is made higher as shown in the range of a in FIG. Then, in step 3, when the control means 12 determines that the intake air volume detected by the air volume detection means 13 has not reached the set air volume in the small air volume state at point A shown in FIG. 4, the process returns to step 1. When the control means 12 determines in step 3 that the suction air volume has reached the set air volume, the dust volume is almost full, or the suction port is clinged to paper or curtains during cleaning. 4 in which the input of the electric blower 11 is set in advance, the state is determined as an abnormal state such as a sticky state in which the air blower is closed or a suction state in which a futon or a cushion is attached to the cleaning surface. It is determined whether or not it has been reduced to the range (step 5).

If it is determined in step 5 that the input of the electric blower 11 has not been reduced to the predetermined range of b in the figure, the control means 12 sets the input of the electric blower 11 in advance. 4 (step 6) to prevent the electric blower 11 from being overheated due to a failure to obtain a predetermined suction air amount which also serves as a cooling air for the electric blower 11. In addition, when the drive sound of the electric blower 11 is lowered due to a decrease in the drive sound, the cleaning worker is notified that the abnormality is in an abnormal state and the abnormal state is to be avoided.

Thereafter, the timer 14 of the control means 12 is reset (step 7), and the timer 14 is started to measure time (step 8).

Further, the control means 12 determines whether or not the timer 14 has reached a preset time T, for example, whether or not three seconds have elapsed (step 9).

On the other hand, if it is determined in step 5 that the input of the electric blower 11 has been reduced to the set input value which has already been set in the range b in the figure, the process proceeds to step 9.

Then, in step 9, the control means 12
If it is determined that the time t measured by the timer 14 has not reached the set time T, an abnormal state such as a clinging state or a sucking state in which dust or a curtain is closed is released and a normal cleaning state is performed. And electric blower 11
Then, it is determined whether or not the suction air amount has reached point D which is the return air amount in FIG. 4 (step 10). If it is determined in step 10 that the abnormal state has been released and the suction air volume has reached point D in FIG. 4 which is the return air volume, the control means 12 sets the input of the electric blower 11 to a low state. 4 is set to the range of c (step 11), and the process returns to step 1. If it is determined in step 10 that the intake air volume has not reached the return air volume at point D in FIG. 4, the process returns to step 1.

On the other hand, if the control means 12 recognizes in step 9 that the time t measured by the timer 14 has reached the set time T, the control means 12 determines that the abnormal state is not released even if a predetermined time has elapsed. That is, it is determined that the dust is in a clogged state in which the amount of sucked dust is full, and the drive of the electric blower 11 is stopped (step 12), and the process returns to step 1.

As described above, according to the above-described embodiment, in a state where the suction airflow of the electric blower 11 detected by the airflow detection means 13 becomes a small airflow state that is equal to or less than a predetermined value, for example, stagnation, suction, and suction are performed. Judgment of abnormal conditions such as blockage of dust, increase in the amount of trapped dust, and clogging of the dust collection bag, reduce the input of the electric blower 11 once. The electric blower 11 is driven by judging that it is an abnormal state such as a full dust or clogged dust collection bag, etc. Is stopped, and overheating of the electric blower 11 due to driving with the input of the electric blower 11 reduced can be reliably prevented, and each part such as the electric blower 11 and the main body case 2 due to overheating of the electric blower 11 is damaged. This Can be reliably prevented.

Further, when an abnormal condition occurs, the electric blower 11 is not stopped immediately but stopped after a predetermined period of time, for example, about 3 seconds. The electric blower 11 stops every time suction occurs, and there is no need to perform the setting operation to drive the electric blower 11 again after canceling the abnormal state,
The cleaning work can be prevented from being complicated, the cleaning workability can be improved, and damage to each part due to the fact that the drive of the electric blower 11 is not reduced for a long time can be prevented.

Further, since the air volume detecting means 13 is arranged between the intake side of the electric blower 11 and the dust collecting chamber, that is, between the electric blower 11 and the auxiliary dust collecting filter, for example, It is possible to recognize an abnormal state such as a reduction in the amount of suction air due to clogging of the auxiliary dust collection filter and a state in which the hose 4 and the insertion port 3 are blocked by the sucked dust.

In the above embodiment, a canister type structure in which the hose 4 is connected to the cleaner body 1 has been described. For example, an upright type in which a suction port is opened in the cleaner body 1, a self-propelled type, a handy type A similar effect can be obtained with any structure such as a mold.

The air flow detecting means 13 may be provided at any position where the air flow of the electric blower 11 can be detected, that is, at any position in the air path from the suction port to the exhaust port.

Furthermore, the electric blower 11 is stopped when the state where the intake air amount is equal to or less than the predetermined intake air amount continues for three seconds, but the present invention is not limited to this time. As described above, it is preferable to set the time so that the operation is not complicated and each part is not damaged by overheating of the electric blower 11.

[0033]

According to the vacuum cleaner of the present invention, the ratio of the air volume to the input of the electric blower detected by the air volume detecting device is longer than a predetermined time in a small air volume state equal to or less than a predetermined value. In order to stop the drive of the electric blower at the time, if the small air volume state continues for a predetermined time, when the input of the electric blower is once reduced, for example, sticking or sucking, obstruction of the sucked dust is not avoided, Judgment of dust clogging, such as an increase in the amount of captured dust and clogging of the dust collection bag, has been made, and overheating of the electric blower due to continued cleaning with the input of the electric blower reduced is reliably prevented. it can.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of the electric vacuum cleaner.

FIG. 3 is a flowchart showing an operation of controlling the drive of the electric blower based on the intake air amount.

FIG. 4 is a graph showing the relationship between the negative pressure on the negative pressure side of the electric blower and the amount of air drawn by driving the electric blower.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 2 Main body case 11 Electric blower 12 Control means 13 Air volume detection means 14 Timer as timekeeping means

Claims (1)

[Claims] A main body accommodating an electric blower, an air flow detecting means for detecting an air flow sucked by the electric blower, and a ratio of an air flow detected by the air flow detecting means to an input of the electric blower is equal to or less than a predetermined value. While reducing the input of the electric blower when the small air volume state,
A controller for stopping the driving of the electric blower by recognizing that the low air volume state has continued for a predetermined time or more.