JP3299405B2 - Electric vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner having an electric blower.

[0002]

2. Description of the Related Art In a vacuum cleaner equipped with an electric blower, a configuration has been considered in which electric power supplied to the electric blower is automatically changed in order to maintain a high power.
For example, as shown in the graph of the air volume (Q) -power (Pw) characteristic in FIG. 6, when operating at high output (high power)
In addition, if the amount of dust increases or clogging occurs, the degree of vacuum in the dust collection chamber increases, the load applied to the electric blower decreases, and the supplied power, that is, the current input to the electric blower decreases. . Therefore, for example, a graph of the air volume (Q) -input power (Pin) characteristic of FIG. 6 and FIG.
As shown in the graph of the air volume (Q) -input current (Pin) characteristic, a state where the current value input to the electric blower has dropped to a predetermined threshold value is detected, and the electric power supplied to the electric blower is automatically adjusted. When the degree of vacuum in the dust collection chamber is reduced due to a decrease in dirt while the load is applied to the electric blower, the current value input to the electric blower is increased to a predetermined threshold. It has been considered to maintain the power at a high value by detecting the state of rising to the maximum and automatically lowering the power supplied to the electric blower in a stepwise manner.

[0003] However, as described above, when the threshold value a for automatically stepping up and down the power supplied to the electric blower is set, for example, the current value input to the electric blower becomes a predetermined threshold value a. When it falls over, the power supplied to the electric blower automatically rises, but at this point,
Since the current value rises above the predetermined threshold value a, it is erroneously determined that dust has decreased, and there is a problem that malfunctions such as the power supplied to the electric blower falling again are caused. I have.

As shown in FIG. 8, when the current detected value fluctuates near a predetermined threshold value a, for example, when the current input to the electric blower has ripples, the electric blower There is a problem that the supplied power fluctuates unstablely.

[0005]

As described above, when a threshold value for automatically stepping up and down the power supplied to the electric blower is set, when the current value exceeds the threshold value, the current value fluctuates. There is a problem that an electric power supplied to the electric blower is erroneously moved up and down, and it is difficult to keep the power at a high value. Further, when the current detected value fluctuates near a predetermined threshold value, such as when a ripple is generated in the current input to the electric blower, the power supplied to the electric blower fluctuates unstablely. It has problems such as getting lost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vacuum cleaner capable of appropriately and automatically changing electric power supplied to an electric blower and maintaining a high power. And

[0007]

According to a first aspect of the present invention, there is provided an electric vacuum cleaner comprising: an electric blower; and control means for controlling the electric blower, wherein the control means determines whether a current value inputted to the electric blower is sufficient. detects whether a rising or falling
Together with different rising thresholds and falling thresholds
Threshold setting means for setting the threshold value, and current detection means for measuring whether the current value is above or below the threshold value, and when the current value falls below the threshold value for when falling ,
The current value is above the temperature of the power supplies before <br/> Symbol electric blower so as not to exceed the threshold value for the time the rise, when the current value rises above the threshold value for the time the rise, The current value
There are those that the power supplied to the electric blower so as not to fall below the threshold value for when the descent and a power control unit that causes descent.

[0008]

In the vacuum cleaner according to the first aspect, the load on the electric blower is reduced due to an increase in the amount of dust or clogging, and the current value input to the electric blower is reduced. When the threshold value for falling is set, and the current value falls below the threshold value for falling ,
Threshold so that the current value does not exceed, Ru increases the power supplied to the electric blower. In addition, the amount of dust is reduced, or the clogging is eliminated, and the load on the electric blower is increased, and in a state where the current value input to the electric blower is rising, the threshold is different from the threshold for descent. A threshold value for rising is set, and in a state where the current value exceeds the threshold value for rising , the current value does not fall below the threshold value for falling.
To, Ru lowers the power supplied to the electric blower.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vacuum cleaner according to an embodiment of the present invention.

In FIG. 5, reference numeral 1 denotes a vacuum cleaner main body, and a base end of a hose 2 is detachably connected to the vacuum cleaner main body 1, and a distal end of the hose 2 is branched backward. A hand operation unit 3 having a bent shape is provided. A suction port body 5 is attached to the distal end of the hand operation unit 3 via a telescopic extension tube 4.

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

First, the electric vacuum cleaner main body 1 is provided with an electric blower 11 facing the dust collection chamber, and a control means 12 for controlling the electric blower 11 is provided. The electric blower 11 has a commercial AC power supply E of 100 volts, a triac 14 as a power control means constituting the control means 12, and a current detection means 15 constituting the control means 12.
Are connected in series.

The control means 12 comprises a so-called microcomputer having a CPU and the like.
From the power transformer 17 and the rectifier circuit 18 to supply a current of a predetermined waveform to the gate of the triac 14, which is a bidirectional power control element, to change the power supplied to the electric blower 11. Has become.

Further, the current detecting means 15 includes an electric blower
The current flowing through the electric blower 11 is measured, and a state where the current flowing through the electric blower 11 is falling and a state where this current value is rising are provided with threshold setting means for setting a plurality of different thresholds respectively. In addition, the current detection means 15 detects whether the current detection value output as a voltage in proportion to the current flowing through the electric blower 11 is above or below each threshold.

As described above, the threshold value for changing the electric power supplied to the electric blower 11 is a falling threshold value (lower threshold value) applied for increasing the electric power in a state where the current detection value of the current detecting means 15 is decreasing. Ua, Ub, Uc) and rising thresholds (Da, Db, Dc) applied to lower the power in a state where the current detection value is increasing are set separately. A table summarizing these thresholds is shown below.

[0016]

[Table 1]

The control means 12 measures whether the current value input to the electric blower 11 is above or below a predetermined threshold value at a predetermined interval for a predetermined number of times, and these measurement results are all the same. Only in this case, it is detected that there has been a change exceeding the threshold, and the power supplied to the electric blower 11 is changed.

Next, the operation of the above embodiment will be described with reference to the flowchart shown in FIG.

First, when a current input to the electric blower 11 is input to the current detecting means 15 while the electric blower 11 is operating (step 1), the current detecting means 15
The current value is read continuously at a predetermined interval a predetermined number of times, and a measurement result is output (step 2). Then, based on the measurement result, it is determined whether the current value input to the electric blower 11 has changed, that is, whether the measurement results match and change in the same direction (step 3). If the measured results do not match and change in the same direction, it is determined that there has been no change in the input that requires a change in the power supplied to the electric blower 11, and the process returns to step 1. On the other hand, if the measurement results match and change in the same direction, it is determined that the input has changed,
Determine if input value is falling or rising
(Step 4).

For example, when the electric blower 11 is operating at a high output (high power) and the load on the electric blower 11 is increased due to an increase in the amount of dust or clogging, etc., as shown in FIG. As shown in section 1 of the graph of the characteristic of the airflow-current detection value, the airflow is narrowed, the degree of vacuum in the dust collection chamber increases, and the supplied power, that is, the current value input to the electric blower 11 decreases. . In this state, if it is determined that the input value is falling, the falling threshold value (Ua, Ub, U
c) is set, and the current value is read a predetermined number of times in a predetermined time (step 5). When the measured current detection values are all smaller than a predetermined threshold value Ua for shifting from the first stage to the second stage, the current value is set to the threshold value Ua.
The control mode of the control means 12 is changed from the input command for the first stage to the input command for the second stage (step 7). That is, the waveform supplied to the gate of the triac 14 is changed, the power supplied to the electric blower 11 is increased, and the process returns to step 1. As a result, as shown in section 2a of the graph, the air volume and the detected current value are increased, and the power is controlled to be maximized. In step 6, when at least one of the measured current detection values is larger than the threshold value Ua, the current value is not determined to be smaller than the threshold value Ua, and the power supplied to the electric blower 11 is not determined. Without change
(Step 8) Return to step 1.

Further, even if the power supplied to the electric blower 11 is changed from the first stage to the second stage, the clogging is not eliminated,
Alternatively, when the amount of dust is large, as shown in the section 2b of the graph, the airflow further decreases, and the current detection value of the current detecting means 15 further decreases. In this case, the above steps 1 to 7 are repeated, and the predetermined threshold value Ub at which the current detection value shifts from the second stage to the third stage
If it becomes smaller, the control means 12 changes the waveform supplied to the gate of the triac 14, and increases the power supplied to the electric blower 11. As a result, as shown in section 3a of the graph, the air volume and the detected current value are increased, and the power is controlled to be maximized. Furthermore, even in this state,
If the clogging is not eliminated or the amount of dust is large, the airflow further decreases and the current detection value of the current detection means 15 further decreases as shown in section 3b of the graph. Then, when the current detection value becomes smaller than the predetermined threshold Uc at which the current value shifts from the third stage to the fourth stage, the control unit 12 changes the waveform supplied to the gate of the triac 14 to reduce the power supplied to the electric blower 11. increase. As a result, as shown in the section 4a of the graph, the airflow and the current detection value are increased and the power is controlled so as to become the maximum.

In this state, if the clogging is not eliminated or the amount of dust is large, the air volume is further reduced as shown in section 4b of the graph. The power is not increased.

On the other hand, when the amount of dust applied to the electric blower 11 decreases due to the reduction of dust or the clogging of the electric blower 11 in a state where the air flow of the electric blower 11 is reduced, the air flow-current of FIG. Section 4b of the graph of the characteristic of the detected value
As shown in (2), the air volume increases, and the supplied power, that is, the current input to the electric blower 11 increases. In this state, in step 4, it is determined that the input value is increasing, the thresholds (Da, Db, Dc) for rising are set, and the current value is read a predetermined number of times in a predetermined time ( Step 9). Then, a predetermined threshold value D for all the measured current detection values to shift from the fourth stage to the third stage
If it is larger than a, it is determined that the current value has become larger than the threshold value Da (step 10), and the control means 12
The control mode changes from the fourth-stage input command to the third-stage input command (step 11) and returns to step 1. In this state, the control means 12 changes the waveform supplied to the gate of the triac 14 to reduce the power supplied to the electric blower 11. As a result, as shown in section 4a of the graph, control is performed so that the air volume and the detected current value decrease and the power becomes maximum. In step 10, when at least one of the measured current detection values is smaller than the threshold value Da, the current value is not determined to be larger than the threshold value Da, and the power supplied to the electric blower 11 is not determined. Does not change (step 8), and returns to step 1.

If the air volume further increases from this state, the current detection value of the current detection means 15 further increases as shown in section 3b of the graph. When the current detection value becomes larger than the predetermined threshold value Db at which the current value shifts from the third stage to the second stage, Steps 1-4 and Steps 9-1 are performed.
1 is repeated, and the control means 12 changes the waveform supplied to the gate of the triac 14 to further reduce the power supplied to the electric blower 11. As a result, section 3a of the graph
As shown in (2), control is performed so that the air flow and the current detection value decrease and the power is maximized. In this state, when the air volume further increases due to a decrease in dust or the like, the current detection value of the current detection means 15 further increases as shown in a section 2b of the graph. Then, when the current detection value becomes larger than the predetermined threshold value Dc at which the current value shifts from the second stage to the first stage, the control means 12 changes the waveform supplied to the gate of the triac 14 to reduce the power supplied to the electric blower 11. Further lower. As a result, as shown in the section 2a of the graph, the air volume and the detected current value are reduced, and the power is controlled so as to become the maximum.

When the air volume further increases from this state, as shown in section 1 of the graph, the electric blower
The power supplied to 11 is not reduced.

As shown in FIG. 3, the control means 12
Sections 2a, 3a, in which the power supplied to the electric blower 11 is increased
The maximum values of the predetermined current detection values of 4a are 2p, 3p, and 4p, respectively.
Then, for example, when the maximum value 2p of the current detection value when the current value rises from the first stage to the second stage exceeds the threshold value Dc at the time of falling to the lower stage, it is determined that the threshold value Dc at the time of the lower stage has been exceeded. Since the control unit 12 may reduce the power supplied to the electric blower 11 to the first stage again, these maximum values 2p, 3p, 4p are respectively 2p <Dc, 3p <Db, 4p < D
The condition is a.

As described above, according to the vacuum cleaner of the present embodiment, the amount of dust increases or decreases, or
When the load of the electric blower 11 fluctuates and the current input to the electric blower 11 increases or decreases, the increase or decrease of the current is detected by the current detecting means 15.
Is detected, and based on the detection result, the triac 14 can change the electric power supplied to the electric blower 11 in a stepwise manner and can operate the electric blower 11 in a state where the power is at a maximum value.

The control means 12 sets a plurality of different thresholds in a state where the current value input to the electric blower 11 increases and in a state where the current value decreases, so that the electric blower 11 In both the case where the supplied electric power is increased stepwise and the case where the supplied electric power is decreased, it is also possible to approximate the locus of the graph of the characteristic of the airflow-current detection value, and in a predetermined operation mode. In addition, it is possible to change the power supplied to the electric blower 11 in an appropriate state, and to suppress a decrease in power.

The current detecting means 15 measures whether the current value input to the electric blower 11 is above or below a predetermined threshold value at a predetermined interval for a predetermined number of times, and when the measurement results are the same, Only when it is confirmed that there is a change exceeding the threshold value, the power supplied to the electric blower 11 is changed. Therefore, noise and the like instantaneously enter the detected current value that is output almost in proportion to the input of the electric blower 11,
The microcomputer of the control means 12 determines that there is a change exceeding the threshold value, and it is possible to suppress a malfunction in which the power supplied to the electric blower 11 fluctuates unstablely.

Further, for example, when the power supplied to the electric blower 11 is varied based on one measurement result of the current detecting means 15, as shown in FIG. 7, in the section 2a which rises from the first stage to the second stage, , X section between threshold a and threshold b is 2
The power is increased by erroneously determining the section 3a that rises from the third step to the third step, and then increasing the power by erroneously determining that the section is rising from the third step to the fourth step. Although there is a possibility that it will rise instantaneously to the fourth step from
The time required for the section 2a ascending from the first step to the second step is
By setting the measurement time at a predetermined interval within a predetermined number of times, it is possible to prevent such an excessive fluctuation and to stably raise the level from the first step to the second step. Further, in the state where the current detection value is stably changing, even if a slight fluctuation such as a ripple occurs near any of the threshold values, the electric blower 11
It is possible to suppress the power supplied to the power supply from fluctuating in an unstable manner, and to operate the electric blower 11 stably.

Further, by detecting the value of the current supplied to the electric blower 11 and measuring the load applied to the electric blower 11, the structure can be simplified as compared with a structure in which a pressure sensor or the like is provided in the dust collection chamber. In addition, the manufacturing cost of the vacuum cleaner can be reduced.

[0032]

According to the first aspect of the present invention, the load on the electric blower is reduced due to an increase in the amount of dust or clogging, and the current value input to the electric blower is reduced. while you are, sets the threshold value for the time descent, with the current value is lowered beyond the threshold for when this descends, the upper
Both the current value of the threshold value for a time temperature is you increase the power supplied to the electric blower so as not to exceed the amount of waste is reduced,
Or, such as eliminating the clogging, the load of the electric blower is increased, and in a state where the current value input to the electric blower is increasing, a rising threshold different from the descending threshold is set, When the current value has risen beyond the rising threshold, the falling threshold must not fall below the current value.
Sea urchin, that Kudasu under the power supplied to the electric blower. Thus, the state where the current value input to the electric blower increases,
In a state where the current value is lowered, for at different elevations from one another
By setting the threshold value and the threshold value for descent, the power supplied to the electric blower is changed in an appropriate state when the power supplied to the electric blower is increased and when the power is decreased. Power can be maintained at a high value, so that the electric blower can operate stably.
You .

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a vacuum cleaner of the present invention.

FIG. 2 is a flowchart showing an operation of the electric vacuum cleaner.

FIG. 3 is a graph showing a relationship between an airflow and a current detection value in a state where the airflow decreases.

FIG. 4 is a graph showing a relationship between an air flow and a detected current value in a state where the air flow increases.

FIG. 5 is a perspective view of the electric vacuum cleaner.

FIG. 6 is a graph showing the relationship between the air volume and the power, and the relationship between the air volume and the input current.

FIG. 7 is a graph showing a relationship between an air flow and a current detection value.

FIG. 8 is a graph showing a relationship between an air flow and a current detection value.

[Explanation of symbols]

 11 Electric blower 12 Control means 14 Triac as power control means 15 Current detection means

Claims (1)

(57) [Claims] And 1. A electric blower, and control means for controlling the electric blower, wherein the control means is configured to detect whether the current value input to the electric blower is rising or falling, together At different ascents
Threshold setting means for setting a threshold for use and a threshold for falling, current detecting means for measuring whether the current value is above or below the threshold, and the current value exceeds the threshold for falling. When falling , the current value does not exceed the rising threshold value.
The power supplied to the electric blower is above the temperature, when the current value rises above the threshold value for when the rise in the collector
Current values vacuum cleaner, characterized in that the power supplied to the electric blower so as not to fall below the threshold value for when the descent and a power control unit that causes descent.