JP2009017909A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce excessive electric power by changing stably and smoothly the electric power in accordance with the suction air volume and ensuring suction power by air volume-electric power characteristics in accordance with the state of a suction fixture. <P>SOLUTION: A microcomputer 15 as the determining means switches a preset first phase-current determining value characteristic, a second phase-current determining value characteristic, and a third phase-current determining value characteristic in accordance with the state of the suction fixture that is detected by a connection detecting section 18 and controls supplied electricity of an electric air blower 2 by a phase control. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to control of an electric blower in a general household or business use vacuum cleaner.

  FIG. 13 shows a schematic configuration diagram of a conventional vacuum cleaner.

  In FIG. 13, 1 is a main body of a vacuum cleaner, 2 is an electric blower that is built in the main body 1 and generates a suction force, 3 is a hose having operation means 4, 5 is an extension pipe, 6 is a suction tool that is in contact with the floor surface to be cleaned and serves as an air inlet for sucking dust existing on the floor surface, and rotates to rotate and collect the dust on the floor surface. A brush 7 and an electric motor 8 for driving the rotating brush 7 are incorporated.

  Reference numeral 9 denotes a dust collection chamber for storing sucked dust. The hose 3 and the dust collection chamber 9 are connected to each other through an air inlet 10 provided in the main body 1, and the dust collection chamber 9 and the hose 3 or the dust collection chamber 9 are collected. The intake passage is formed by a combination of the dust chamber 9 and the hose 3 and the extension pipe 5 or the dust collection chamber 9 and the hose 3, the extension pipe 5 and the suction tool 6. The hose 3, the extension pipe 5, and the suction tool 6 contain wiring (not shown) for supplying and transmitting electric power supplied from the air inlet 10 of the main body 1 to the electric motor 8.

  The main body has a power cord having a power plug, and power is supplied to the device by connecting the power plug to a commercial power source.

  When the electric blower 2 is activated by operating the operating means 4 with the power cord connected to the commercial power supply, a signal of the current value detected by the current detecting means (not shown) is supplied to the control means (not shown). The control means is controlled to trigger on the electric blower 2 at a phase set in advance according to the current value, and to have a desired power or current value by phase control.

  Further, when the operation means 4 is operated, at the same time, electric power is supplied to the electric motor 8 through the wiring built in the intake passage, and the rotating brush 7 also performs the rotating operation.

When cleaning the floor surface, the suction tool 6 is in contact with the floor surface, and it is assumed that the cleaning is not performed in a state where the suction tool 6 is not in contact with the floor surface. In order to obtain a certain suction force when pressed against the surface, the applied voltage to the electric blower 2 is increased, and when it is lifted from the floor, the applied voltage is decreased to reduce wasteful power consumption. Control is performed to suppress this.
JP 2001-157492 A

  However, in the configuration of Patent Document 1, the characteristics of the relationship of the supply voltage to the electric blower 2 with respect to the current flowing through the electric blower 2 are fixed regardless of the state of the suction tool 6. When cleaning is performed in the removed state, the air volume tends to shift to the open side as compared with when the suction tool 6 is attached for cleaning, and there is a possibility that sufficient suction force cannot be obtained. . Further, in recent years, vacuum cleaners have very high power consumption in order to obtain a high suction force, and there are limitations on circuit breakers for general households. When control for switching power is performed regardless of current or power, there is a problem that sufficient suction force cannot be obtained if priority is given to the upper limit.

  The present invention solves the above-described conventional problems, and has an air volume-power characteristic according to the state of the suction tool, and the power according to the state of the suction tool while stably and smoothly changing the power according to the suction air volume. It is another object of the present invention to provide a vacuum cleaner that can obtain the maximum suction force regardless of the state of the suction tool.

  In order to solve the above-described conventional problems, the vacuum cleaner of the present invention flows to the electric blower, the electric blower that generates suction air, the rotary brush and the suction tool having the electric motor for driving the rotary brush, and the electric blower. Current detection means for detecting current, and a plurality of phase angles and current judgment values for switching the phase angle with respect to the output of the current detection means corresponding to each of the phase angles on a one-to-one basis The phase angle and the current determination paired with the phase angle so as to have a phase-current determination value characteristic so that the output of the current detection means substantially matches the current value on the phase-current determination value characteristic. Control means for controlling the power supplied to the electric blower by switching values stepwise, and state determination means for detecting a load state such as a rotation state of the suction tool and a connection state are provided. . Thereby, the control means has a plurality of phase-current determination value characteristics according to the state of the suction tool in advance, and the determination of the state determination means according to the current detected by the current detection means. The electric power supplied to the electric blower is controlled with a phase on the phase-current determination value characteristic corresponding to the state of the suction tool.

  Moreover, the vacuum cleaner of this invention makes all the one ends of the one where the electric power supplied to an electric blower high of the some phase-current determination value characteristic become the same. Thereby, in the area where the suction force is required, the same maximum suction force can be supplied regardless of the state of the suction tool.

  Depending on the state of the suction tool and the state of dust suction into the dust collection chamber, the optimum power and maximum suction power can be achieved while smoothly changing the supplied power, and unnecessary power can be reduced. .

  In a first aspect of the present invention, the electric vacuum cleaner of the present invention detects an electric fan that generates suction air, a suction tool having a rotating brush and an electric motor for driving the rotating brush, and a current flowing through the electric fan. Phase-current determination comprising current detection means, and a plurality of phase angles and a current determination value for switching the phase angle with respect to the output of the current detection means corresponding to each of the phase angles on a one-to-one basis The phase angle and the current determination value paired with the phase angle are stepwise so that the output of the current detection means has a value characteristic and substantially matches the current value on the phase-current determination value characteristic. The control means for controlling the power supplied to the electric blower and the state determination means for detecting the load state such as the rotation state of the suction tool and the connection state are provided. Detected current Accordingly, the supply power of the electric blower is controlled with the phase on the phase-current determination value characteristic corresponding to the state of the suction tool determined by the state determination means, and the suction force is increased in the area where the suction force is required. Thus, in areas where suction force is not required, the power supply can be reduced and the operation can be performed with the optimum power supply according to the state of the suction tool and the amount of dust suction.

  In the second aspect of the invention, since one end of the plurality of phase-current determination value characteristics of the first aspect in which the power supplied to the electric blower is increased is made the same, it is almost the same regardless of the state of the suction tool. Maximum suction force can be obtained.

  According to a third aspect of the present invention, there is provided connection determination means for determining whether or not the suction tool is connected to the intake flow path as the state determination means of the first or second invention, and the control means determines the connection determination means. The suction tool has a plurality of phase-current determination value characteristics according to the connection status of the suction tool, and the plurality of phase-current determination value characteristics are switched according to the connection status. By switching the phase-current judgment value characteristics between when connected to and when not connected, the control means switches between the suction tool connection status and the amount of dust suction. I can drive.

  According to a fourth aspect of the present invention, in contrast to the first or second aspect of the present invention, a rotation determination unit that detects whether or not the rotating brush is rotating is provided as a state determination unit, and a control unit is configured to determine the rotation determination unit. Since the plurality of phase-current determination value characteristics according to the rotation status of the rotary brush are configured and the plurality of phase-current determination value characteristics are switched according to the rotation status, the rotary brush is rotating. When the control means switches the phase-current determination value characteristic between when and when it is not, it can be operated with the optimum power supply according to the rotation state of the rotary brush and the amount of dust sucked.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment 1)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In addition, about the components of the same structure as the past, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  FIG. 1 is a block diagram of a control portion in the electric vacuum cleaner according to Embodiment 1 of the present invention. In FIG. 1, 2 is an electric blower, 12 is a first bidirectional thyristor for driving the electric blower 2, and 13 detects a current flowing through the electric blower 2, converts it into a signal level voltage and outputs it. Reference numeral 14 denotes current detection means. Reference numeral 14 denotes amplification means for amplifying a signal output from the current detection means 13. The amplification means 14 converts the current signal output from the current detection means 13 into two amplification signals “amplification 1” and “amplification 2” having different amplification degrees, and outputs them.

  Here, FIG. 2 shows the relationship between the current flowing through the electric blower 2 and the air flow (air flow-current characteristics). If the characteristics of the electric blower 2 are determined, the relationship between the current flowing through the electric blower 2 and the air flow is 1: 1. If the relationship between the air volume and the current value is set in advance, the current detection means 13 can detect the air volume. If the air volume can be detected, the amount of dust sucked, that is, the amount of dust accumulated in the dust collecting chamber 9 is detected. Can also be detected. Therefore, in the present embodiment, the current detection means 13 also serves as an air volume detection means for detecting the air volume.

  Reference numeral 15 denotes a microcomputer, which also serves as a control means for controlling the power supplied to the electric blower 2. Further, in this embodiment, the microcomputer 15 controls the power supply to the motor 8 by controlling the trigger of the second bidirectional thyristor 19. The microcomputer 15 has an A / D (analog / digital) conversion function, and inputs “amplification 1” to “AD1” and “amplification 2” to “AD2”. The signals input from “Amplification 1” and “Amplification 2” are selectively used according to the purpose of processing in the microcomputer 15.

  Reference numeral 18 denotes a connection detection unit of connection determination means for determining whether or not the suction tool 6 is connected to the intake flow path, and detects a current flowing through the electric motor 8. The microcomputer 15 also serves as a connection determination unit that determines whether or not the suction tool 6 is connected based on the detection result of the connection detection unit 18, and the connection detection unit 18 and the connection determination unit constitute a connection determination unit. To do. The current can be detected in the main body 1 by utilizing the fact that the power supply wiring built in the intake flow path is also drawn into the main body 1 through the intake port 10. The microcomputer 15 also receives operation information from the operation means 4, and the detected current at the connection detector is a predetermined value even though the instruction of the rotary brush 7 at the operation means 4 is “operation”. When it is detected that the current is less than the current value, that is, that no current is flowing, the connection determination unit can determine that the suction tool is “not connected”. It can be determined. Further, when the instruction of the rotary brush 7 on the operation means 4 is “stop”, assuming that the suction tool 6 is connected, the user performs the cleaning operation so that the rotary brush 7 is connected to the floor surface. As a result, the electric motor 8 becomes a generator and an electromotive force is generated. By determining the fluctuation of the electromotive force appearing in the connection detection unit 18 by the connection determination unit, it can be determined that the connection is established even when the instruction of the rotary brush 7 is “stop”. On the contrary, if there is no fluctuation and no current is flowing, there is no one that receives the force due to contact with the floor (the rotating brush 7) nor one that generates an electromotive force. It can be determined that there is no state. As can be seen from the above description, in the present embodiment, the connection determining means also determines whether or not the rotating brush 7 is rotating in the process of determining whether or not it is connected. I can also serve. That is, there are three states of the suction tool 6: “not connected”, “connected and the rotating brush 7 is stopped”, and “connected and the rotating brush 7 is rotating”. It will be.

  11 is a commercial power supply of AC100V, 16 is a power supply circuit that creates the power supply Vdd (5V) of the microcomputer 15, and 17 is a zero cross detection circuit that detects a zero cross of the commercial power supply and outputs a zero cross timing signal. is there. Zero crossing is a timing at which 0V is passed when the polarity of the commercial power source, which is AC, is reversed.

  The microcomputer 15 recognizes the zero-cross timing based on the zero-cross timing signal input from the zero-cross detection means 16 and triggers on the first bidirectional thyristor 12 at a predetermined timing in synchronization with the zero-cross. Phase control for controlling the power supplied to the blower 2 is performed.

  FIG. 3 shows a waveform of one cycle of the commercial power supply frequency (20 ms if the frequency of the commercial power supply 11 is 50 Hz, and 16.66 ms if the frequency is 60 Hz). The shaded area is an energized region. 3 is a waveform in which the input line 1 in FIG. 3 is fully energized, that is, the bidirectional thyristor 12 is triggered on simultaneously with the zero crossing. As the input line 2, the input line 3, and the input line 4 are reached, the trigger-on timing is delayed, the effective value of the voltage applied to the electric blower 2 is reduced, and the supply power is also reduced.

  Here, the power supplied to the electric blower 2 by phase control will be described with reference to FIG. In FIG. 4, there is an air volume-power characteristic of input line A and input line B that are phase-controlled with different fixed phases. In the input line A, the trigger-on timing is closer to zero cross and the applied voltage is higher, so that the supply power is higher. Now, when trying to measure the power consumption of the electric blower 2, when the input line A is set to a state where the air volume Qa is set, and when the input line B is set to the air volume Qb, the same power value is shown. become. That is, since the electric power actually consumed by the electric blower 2 varies depending on the air volume sucked by the electric blower 2, the electric power actually consumed is hereinafter referred to as “electric power” regardless of the input line. The input line fixed at the timing when the thyristor 2 is triggered on is referred to as “supply power”. The applied voltage is an effective value in the shaded area shown in FIG.

  Further, as shown in FIG. 5, the amount of air sucked into the electric blower 2 is related to the amount of dust accumulated in the dust collecting chamber, and the amount of dust ( When the relationship between (mass) and air volume is measured, the characteristics shown in FIG. 5 are obtained. As shown in FIG. 5, the closer the trigger timing of the bidirectional thyristor 12 is to zero cross, that is, closer to full conduction (input line 1), the slower the decrease in the air volume when sucking dust of the same mass, The amount (mass) of dust that can be sucked increases.

  The air volume-current characteristics of the electric blower 2 shown in FIG. 2 coincide with the characteristics of all conduction (input line 1), and the air volume-current characteristics at each supply power can be calculated. FIG. 6B shows the air volume for each supply power-current detection means output characteristics. Since the output of the current detection means 13 is obtained by converting the current value into a signal level, the air volume for each supply power- It can be seen as current characteristics. If the air volume-current characteristics for each power supply and the dust volume-air volume characteristics for each power supply shown in FIG. 5 are known, the amount of dust sucked into the dust collection chamber 6 by the output of the current detection means 13 can be obtained. Accordingly, the electric power supplied to the electric blower 2 can be varied and the electric power can be controlled. However, since the relationship between the amount of dust and the air volume is known, the operation for the air volume will be described here.

  The microcomputer 15 has a first phase-current determination value characteristic, a second phase-current determination value characteristic, and a third phase-current determination value characteristic which are set in advance. For the “not connected” state determined by the determining means, the first phase-current determination value characteristic is used. For the “connected and rotating brush 7 is stopped” state, the second The third phase-current determination value characteristic is assigned to the “connected state where the rotating brush 7 is rotating”.

  The phase-current determination value characteristic is selected and set according to the connection state of the suction tool 6 determined by the microcomputer 15 as the connection determination unit, and the set phase-current determination is performed according to the signal fetched from “AD1”. A phase on the value characteristic and a determination value for the input value of AD1 paired with the phase are set, the first bidirectional thyristor 12 is turned on at the set phase, that is, the trigger timing, and a predetermined supply power It is controlled by. The microcomputer 15 controls the power supplied to the electric blower 2 while sequentially switching the phase and the determination value for the input of AD1 paired with the phase on the set phase-current determination value characteristic. .

  About the vacuum cleaner comprised as mentioned above, the operation | movement is demonstrated below.

  Table 1 shows the values of the phase-current judgment value characteristics set in the microcomputer 15, and the phase, current judgment value (determination value for the value input from “AD1”), and the air volume based on Table 1 in FIG. 7. The relationship of electric power is shown.

  With reference to FIG. 7 and Table 1, the basic concept of how to create the phase-current determination value characteristic and control of the electric blower 2 will be described.

  In FIG. 7, the horizontal axis represents the air volume, the vertical axis represents the power consumption, and the characteristic indicated by the thick solid line is the air volume-power characteristic to be created. Further, the characteristic indicated by the thick dotted line with the air volume on the horizontal axis and the output of the current detecting means on the vertical axis is the air volume-current detecting means output characteristic set to obtain this air volume-power characteristic. When these two are determined, the combination of the phase angle and the current detection means output for an arbitrary air volume is uniquely determined, and this becomes the phase-current determination value characteristic.

  Accordingly, in creating the phase-current determination value characteristic, first, the air volume-power characteristic is created. However, in the vicinity of the air volume Qp at which full conduction is established, a certain amount of dust is accumulated in the dust collection chamber 6, and suction Because power is required, so that the power is high, and in the vicinity of the opening, dust is hardly accumulated in the dust collection chamber 6, so suction force is not necessary, and power saving and noise reduction are achieved. For this reason, the phase-power characteristics are set such that the power is lowered and the vicinity of the open air volume and the air volume Qp that are different powers are gradually changed to smoothly vary the power supplied to the electric blower 2.

  In FIG. 7, a predetermined phase angle that is set at an air flow different from the open air flow and becomes the end of the phase-current determination value characteristic is defined as total conduction θp, and the number of phases corresponding to the input lines is represented by θ0 to θ9 and θp. 11 of them. Note that θ9 is a phase at the time of opening.

  In Table 1, the air volume, power, current determination value, and phase angle are all associated with each other. For example, in FIG. 7, the air volume at which the power on the air volume-power characteristic of the input line with full conduction θp is Wp is Qp, and the current at which the air volume of the input line with all conduction θp is air volume Qp on the output characteristic of the current detection means The detection means output (current value) is uniquely determined to be Ip.

  Here, Wp is the maximum power, and the power W0 to W9 set in the other phases θ0 to θ9 is set to be equal to or less than Wp, and in particular, the vicinity of the phase θp and the vicinity of the open phase θ9 The phase is set so that Wp ≧ W0 and Wn ≧ Wn + 1 (n = 0 to 8). This is because, for example, when W0 ≧ W1, W0 <W1 is set, and the change amount of the power due to the change in the air volume or the current is reduced, so that the power of the electric blower 2 is more stable.

  First, in creating a desired air volume-power characteristic, a target power W9 is determined in an open state, that is, in a state where no dust is accumulated in the dust collection chamber 6. Then, the phase θ9 at which the power becomes W9 in the open state is determined. At this time, the air flow rate Q9 and the determination value I9 for the current detection means output are uniquely determined. Q9 and W9 are one end of the air volume-power characteristic, and θ9 and I9 are one end of the phase-current determination value characteristic.

  Next, the phase at the other end of the phase-current value characteristic is determined. In this embodiment, it is already determined as θp. θp is a full energization, and is an input line where the suction force is expected to be maximized. The suction force (suction power) is a characteristic that can be second-order approximated as shown in FIG. Since the peak appears at a predetermined air volume determined by the characteristics and configuration of the electric blower 2 and the main body 1, the setting to switch to θp with the air volume slightly open from the air volume where the peak appears is the most efficient. Since the maximum suction force can be obtained, the air volume slightly open from the air volume where the peak appears is set as Qp, and the power Wp that is the air volume Qp on the air volume-power characteristic of the phase θp is determined. At this time, the determination value Ip for the current detection means output is uniquely determined. Qp and Wp are the other ends of the air volume-power characteristics, and θp and Ip are the other ends of the phase-current determination value characteristics.

  Although the phase switching operation will be described later, since the phase θp is the arrival phase, Ip is a determination value for switching the phase to I0. Therefore, the setting for switching from the phase θ0 to the phase θp is performed next.

  The setting of I0 is performed with reference to FIG. 9 in which the vicinity of the phase θp is enlarged.

  θ0 is the phase closest to θp, and when the power W0 is set so that W0 ≦ Wp, if the difference between W0 and Wp increases, the power fluctuation of the electric blower 2 when the phase is switched There is a possibility that Wp may be exceeded due to a transient increase in current value at the time of phase switching. Therefore, when changing the phase toward θp, W0 is set as the target power so that the rate of change of power gradually decreases in the vicinity of θp. Since the phase θ0 is clear, the air volume Q0 is uniquely determined for this W0, and the determination value I0 for the current detection means output is also determined.

  Similarly, power is determined for θ1, θ2, and θ3 so that the rate of change in power gradually decreases toward θp, and the air volume and current determination value are determined.

  FIG. 8 shows a characteristic graph in the vicinity of the open state, that is, in the vicinity of the phase θ9. The open state is a state in which almost no dust is accumulated in the dust collection chamber 6, and a high suction force is unnecessary. The power consumption is set to be low so that the power does not change much even when the air volume changes, that is, changes due to the accumulated amount of dust. This is because even if there are two solids with different power consumption and current value in full continuity with respect to the air volume that does not contain dust at all, due to characteristic tolerance caused by individual variations in the manufacture of the electric blower 2 and the main body 1 The electric power is almost constant and has the effect of absorbing the characteristic tolerance. Furthermore, since the variation is improved in the inspection of power consumption and the inspection of noise in the open state, there is an advantage that manufacturing management is easy.

  Accordingly, when the air volume width for which the change in electric power is desired to be minimized is determined with respect to the open air volume Q9 and the air volume at an absolute value corresponding to the air volume width is determined as Q8, the power W9 at the phase θ9 is W8 with the minimum amount of change is determined. When the air volume Q8 and the power W9 are determined, the phase θ8 and the current detection means output determination value I8 are also uniquely determined.

  Since the characteristics in the vicinity of both ends of the air volume-power characteristics have been determined, the characteristics connecting the power at both ends are created. The phase θ7 to the phase θ3 are used for the region connecting the characteristics. At this time, the power can be stably switched by making the change rate of the power in this region as small as possible with respect to the air volume. Furthermore, it is more stable to make the rate of change of power with respect to the current value as small as possible.

  As with the above θp, θ0, θ8, and θ9, the air volume, power, phase, and current detection means output determination value are determined, and the characteristics shown in Table 1 are finally obtained. In Table 1, the microcomputer 15 actually uses two parameters, a current judgment value and a phase value. These are phase-current judgment value characteristics, and the microcomputer 15 inputs the AD1. Accordingly, by switching the phase angle stepwise, it is possible to realize a power trajectory with respect to the air volume as shown by the solid line in FIG.

  Here, as a precondition for setting the determination value for the input value of AD1, that is, the current value, In <In + 1 (n: p, 0 to 8) must be satisfied. If this relationship is reversed, an unstable operation may be caused after the phase is switched or when the phase returns to a lower phase. In other words, the characteristic of the thick dotted line shown in the graph with the air volume on the horizontal axis and the signal value of the current on the vertical axis in FIG. 7 is more stable when the slope is large (the change rate of the signal value is large). Can be switched. Therefore, the area where the power change rate is large, connecting the vicinity of the open state and the vicinity of the total conduction θp, is an area that has a small slope of the thick dotted line and is nearly unstable. In order to increase this inclination, the density of the phases (input lines) assigned to the area may be increased.

  Next, the phase switching operation by changing AD1 will be described with reference to FIGS. FIG. 10 is a diagram showing the switching of the phase with respect to the change in the air volume, and FIG. 11 is a flowchart of the operation.

  In FIG. 10, the amount of dust accumulated in the dust collection chamber 6 is now in a state where the air flow rate Qs3 is obtained at the phase θs3, due to further suction of the electric blower 2. It is assumed that the flow rate increases and changes to a state where the air volume QS1 is obtained at the phase θs1. In the amount of dust that becomes the air volume QS1 in the phase θs1, the air volume in the phase θs3 is smaller than that in QS1, so the current value in the phase θs3 decreases as indicated by the thick dotted line in FIG. Then, as shown in the flowchart of FIG. 11, since I <Ijdj, the phase is switched to θs2, and at the same time, the determination value for the input of AD1 is also switched to Is2, and the supplied power is increased to control the electric blower 2. The

  When the phase is switched to increase the supply power, the suction force also increases. Therefore, if the amount of dust accumulated in the dust collection chamber 6 is the same, that is, if the air load is the same, the phase switching is performed. The air volume immediately after the change temporarily shifts in the upward direction. Based on the same principle, the dust amount that is the air volume Qs1 at the phase θS1 is less than the air volume Qs1 at the phase θS3.

  However, after the phase is switched, the current value decreases to Is2 as indicated by the solid line, and the airflow is also smaller than Qs1 in phase θs2, so that the current value decreases as indicated by the thick dotted line, and the phase switches to θs1. Change. Also here, immediately after the phase is switched to θs1, the air volume is temporarily recovered, but the current value is reduced and balanced at Is1, so that phase switching does not occur, and thereafter the amount of accumulated dust changes. Until then, the electric power supplied to the electric blower 2 is controlled by the phase θs1.

  As shown in FIG. 10, a power fluctuation of ΔW always occurs at the moment when the phase is switched. However, by reducing the interval between adjacent phases, ΔW can be reduced, and the fluctuation in power that can be detected by a measuring instrument can be reduced to a level that cannot be discriminated at all in terms of audibility. Things are possible.

  In the present embodiment, the total conduction θp is set as the predetermined phase angle that is set at the air volume different from the open air volume and is the terminal of the phase-current determination value characteristic, and the phase (input line However, in practice, the end phase may be set to an arbitrary phase, and the number of input lines may be increased. In the phase control based on the zero cross of the commercial power supply, the trigger on timing of the bidirectional thyristor 12 is less than 10 ms at the commercial power supply frequency of 50 Hz and less than 8.33 ms at 60 Hz. Therefore, as the number of phase divisions and the number of input lines are increased, the phase interval to be changed in stages becomes narrower, the power fluctuation of the electric blower 2 when the phase is switched can be suppressed, and the change in operation sound can be reduced. It becomes smooth and you don't feel uncomfortable.

  Based on the method of creating the phase-current determination value characteristic, the first phase-current determination value characteristic, the second phase-current determination value characteristic, and the third phase-current determination value characteristic are created. The air volume-power characteristic based on the phase-current determination value characteristic is created so as to have the relationship shown in FIG.

  When the third phase-current determination value characteristic in the state of “connected and rotating brush 7 is stopped” is a basic setting for performing normal cleaning, “connected and rotating brush 7 is stopped”. As shown in FIG. 12, the state is set such that the air volume-power characteristic is smaller in the vicinity of the open air volume than the air volume-power characteristic by the third phase-current determination value characteristic. On the side opposite to the open state, Wp is the limit power, and in the vicinity of the air volume Qp where the power Wp is the phase θp, the air volume-power characteristic is a phase-current determination value characteristic that gradually reaches Wp.

  In general, on the floor or tatami floor, even if there is no scuffing force by the rotating brush 7, dust can be removed from the floor, and dust can be removed even with a relatively low suction force. On the other hand, in the carpet, dust or the like enters the back of the carpet eye or gets entangled with the flocked hair, so that a scraping force by the rotating brush 7 and a high suction force are required. Therefore, when the rotary brush 7 is “operated”, the second phase-current determination value characteristic and the third phase are assumed on the carpet, and when the rotary brush 7 is stopped, the floor or the tatami floor is assumed. The phase-current judgment value characteristics are different. However, this is a case where the dust collection chamber 9 does not collect much dust and the air volume is large. As the air volume decreases, the power supplied to the electric blower 2 is increased toward Wp. Even if it is a floor or a tatami mat, the maximum suction force can be secured, and when the dust does not accumulate so much, the rotating brush 7 is rotating to ensure that the suction power is secured and the wasteful power is consumed. It can be reduced.

  The first phase-current judgment value characteristic for the state in which the suction tool 6 is “not connected” is that the extension pipe 5 and the hose 3 etc. require a high suction force at a pinpoint to the motor 7. By adding the amount of no power supply as the power supplied to the electric blower 2, the suction force can be further increased. The first phase-current determination value characteristic is also set according to the amount of dust accumulated in the dust collection chamber 9 without exceeding the limit power by setting the power to converge toward Wp. Sufficient suction power can be secured while supplying power.

  In this embodiment, the phase-current determination value characteristic is set in advance. However, if a desired phase-current determination value characteristic is obtained, parameters for calculating each characteristic are set. Needless to say, the same control can be realized even if the current determination value for the phase is calculated and determined.

  Further, in the present invention, the current detection means 13 is used to detect the load state of the electric blower 2 and the supplied power is controlled, but as shown in FIG. 2, the characteristics of the electric blower 2 or If the characteristics of the combination of the electric blower 2 and the main body 1 are determined, the air volume to be sucked in, the current, the rotational speed of the electric blower 2 and the vacuum pressure are correlated, and if one of them is known, the same control can be performed. It goes without saying that the detection means 13 may be constituted by an air volume detection means, a rotation speed detection means, or a pressure detection means.

  As described above, the vacuum cleaner according to the present invention can reduce wasteful power while securing the suction force according to the state of the suction tool, and according to the state of the attachment such as the suction tool. It can also be applied to devices that control power.

The circuit block diagram of the vacuum cleaner in Embodiment 1 of this invention The figure showing the characteristic of the electric blower of the vacuum cleaner The figure explaining phase control of a vacuum cleaner The figure showing the relationship between the electric power of the vacuum cleaner and the supplied power Characteristic diagram showing the relationship between dust volume and air volume of vacuum cleaner (A) The characteristic figure showing the relation between the air volume of the vacuum cleaner and the electric power (b) The characteristic chart showing the relation between the air quantity of the electric vacuum cleaner and the output of the current detection means (A) The characteristic figure showing the relationship between the air volume and power based on Table 1 of the vacuum cleaner, and (b) The characteristic chart showing the relation between the air volume and current detection means output based on Table 1 of the vacuum cleaner. (A) The characteristic diagram showing the relationship between the air volume near the open state of the vacuum cleaner and the power (b) The characteristic diagram showing the relationship between the air volume near the open state of the vacuum cleaner and the output of the current detection means (A) The characteristic figure showing the relationship between the other air volume and electric power of the vacuum cleaner (b) The characteristic diagram showing the relation between the other air volume of the electric vacuum cleaner and the current detection means output (A) The characteristic figure showing the relationship between the air volume and power in the phase switching with respect to the air volume change of the vacuum cleaner. (B) The same, the relationship between the air volume and the current detection means output in the phase switching with respect to the air volume change of the vacuum cleaner. Characteristic diagram Same as above, vacuum cleaner phase switching flowchart Same as above, the target airflow vs. power characteristics of vacuum cleaners Circuit diagram of a conventional vacuum cleaner

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Electric blower 12 1st bidirectional thyristor 13 Current detection means 14 Amplification means 15 Microcomputer 18 Connection detection part 19 2nd bidirectional thyristor

Claims (4)

An electric blower for generating suction air, a rotary brush and a suction tool having an electric motor for driving the rotary brush, a current detection means for detecting a current flowing through the electric blower, a plurality of phase angles and the phase angle The output of the current detection means has a phase-current determination value characteristic that corresponds to each one-to-one and includes a current determination value for switching the phase angle with respect to the output of the current detection means. The electric power supplied to the electric blower is controlled by switching the phase angle and the current determination value paired with the phase angle in a stepwise manner so as to substantially match the current value on the phase-current determination value characteristic. In a configuration having control means and state determination means for detecting a load state such as a rotation state of the suction tool and a connection state, the control means is configured to detect the suction tool determined by the state determination means. A plurality of phase corresponding to state - has a current determination value characteristic, the plurality of phases in response to the state - vacuum cleaner for switching current determination value characteristic. The vacuum cleaner according to claim 1, wherein one end of the plurality of phase-current determination value characteristics where power supplied to the electric blower is increased is the same. As the state discriminating unit, a connection discriminating unit for discriminating whether or not the suction tool is connected to the intake flow path is provided, and the control unit has a plurality of phases according to the connection status of the suction tool discriminated by the connection discriminating unit. The vacuum cleaner according to claim 1, wherein the vacuum cleaner has a current determination value characteristic and switches the plurality of phase-current determination value characteristics according to the connection state. As the state discriminating unit, a rotation discriminating unit for detecting whether or not the rotating brush is rotating is provided, and the control unit has a plurality of phase-current judgment value characteristics according to the rotation status of the rotating brush discriminated by the rotation discriminating unit. The vacuum cleaner according to claim 1, wherein the plurality of phase-current determination value characteristics are switched according to the rotation state.

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