CN1050982A - Vacuum cleaner - Google Patents

Abstract

One control device control one is contained in the suction performance of the blower motor in the main body of dust collector.Control device improves suction performance when dust absorption nozzle is worked, when dust absorption nozzle is not worked, reduce suction performance.Corresponding to general floorings dust absorption nozzle and crack dust absorption nozzle, in predetermined empty range of flow, automatically the dust absorption nozzle of judging is carried out only work control.Set in advance the multiple dust absorption nozzle of actual use.When changing dust absorption nozzle,, change and the selection range of flow along with the change of dust absorption nozzle.Changing size according to working condition selects automatically and changes multiple dust absorption nozzle.Blower motor uses the Brushless DC motor with copped wave control duty factor 100% working range.

Description

The present invention relates to a vacuum cleaner with multiple interchangeable suction nozzles. be controlled.

The vacuum cleaner according to the present invention comprises a detection device for detecting changes in working conditions of a vacuum cleaner having an electrically driven fan motor and a control device for controlling the electrically driven fan motor according to the detection value of the detection device.

The present invention relates to a vacuum cleaner having an electrically driven fan motor that controls the operation of the vacuum cleaner, the electrically driven fan motor being a chopper-controlled brushless DC motor.

The present invention relates to a vacuum cleaner, and more particularly to an improvement to a vacuum cleaner having a converter-driven (inverter-driven) brushless DC motor with a chopper control system.

The above-mentioned vacuum cleaner, that is, a vacuum cleaner including a detection device for detecting changes in the working conditions of a vacuum cleaner with an electric drive fan motor and a control device for controlling the electric drive fan motor according to the detection value of the detection device, is disclosed in Japanese Patent Publication No. Revealed in 280831/1986. Hitherto, there has been known a technique of controlling the output of an electrically driven fan motor based on a detection value of a detection device such as a pressure sensor.

However, these prior art vacuum cleaners do not take into account the operating conditions of the nozzle, that is, do not control the most suitable operating characteristics of the vacuum cleaner according to the cleaning surface being vacuumed.

More specifically, no consideration is given to the interchangeable use of different types of nozzles, or the control of the operating characteristics of the vacuum cleaner within the range of air flow when the filter of the cleaner main body is clogged.

Differences in the operating characteristics of the vacuum cleaner when using different nozzles are explained below. In actual use, as shown in Figure 2, the range of the air flow rate of the dust suction nozzle 7, etc. with a larger opening, such as the dust suction nozzle 7 used for ordinary floors, and the smaller top end, such as the dust suction nozzle 8 used for cracks, is different.

Fig. 3 is a curve diagram of aerodynamic characteristics when the vacuum cleaner body is equipped with a dust suction nozzle 7 for common floors. Curve P1 in the figure is the output static pressure curve of the electric drive fan motor. Curves A1 and A2 represent the exhaust loss pressure of a nozzle for a common floor in the event that the filter of the vacuum cleaner is not clogged.

As shown in Fig. 3, in a vacuum cleaner having a suction nozzle 7 for common floors, the curve A1 is the lower limit value of the air flow rate Q(a) during the period when the filter is not clogged, and the curve A2 is the value when the filter is not clogged. The upper limit of air flow Q(a) during this period. ΔH1 is the variation width of the static pressure of the nozzle 7 for general floors, and ΔQ1 is the variation width of the air flow Q(a) of the nozzle 7 for general floors.

When the ordinary floor cleaning nozzle 7 moves on the cleaning surface to be vacuumed, due to the change of the contact condition of the ordinary floor cleaning nozzle 7, the exhaust resistance also changes and fluctuates between the curves A1 and A2.

The exhaust loss of the suction nozzle part decreases with the decrease of the air flow. As shown in Figure 3, the static pressure variation width △H1 is the difference between the curves A1 and A2, which is the variation width of the exhaust loss pressure according to the dust collection operation, which is made smaller and close to the smaller air in the curve On one side of the flow, the curves A1 and A2 are very close.

Curves B1 and B2 represent the exhaust loss pressure when the filter of the vacuum cleaner is clogged, and the pressure loss increases as the filter is clogged, and its value is larger than that of the curves A1 and A2.

As shown in FIG. 3 , the curve B1 is the lower limit value of the air flow rate Q(b) during the filter clogging period, and the curve B2 is the upper limit value of the air flow rate Q(b) during the filter clogging period.

As described above, the difference between the curves B1 and B2 is the variation width caused by the cleaning operation, and is also the variation width of the pressure loss of the suction nozzle portion corresponding to each air flow rate Q(b). In addition, the air flow rate Q(b) represents the lower limit of the practical use range of the vacuum cleaner on the dust suction characteristic curve.

As shown in FIG. 4 , the actual use range of the vacuum cleaner with the common floor cleaning nozzle 7 is between the air flow Q(a) and the air flow Q(b). An air flow rate smaller than Q(b) is a range in which a vacuum cleaner with a common floor nozzle 7 cannot be used.

In Fig. 4, curve P2 indicates the suction characteristics of the vacuum cleaner during strong operation at 100 volts and curve P3 indicates the suction characteristics of the vacuum cleaner during weak operation at 50 volts.

In addition, the aerodynamic characteristic curve when the crack suction nozzle 8 is installed on the main body of the vacuum cleaner is shown in FIG. 5 . When the output static pressure curve P3 of the electrically driven fan motor is the same as the curve P1 in FIG. 3 , since the opening of the crevice dust suction nozzle 8 is small, the exhaust loss pressure is large.

As shown in Fig. 5, in the vacuum cleaner having the slit nozzle 8, the curve C1 is the lower limit value of the air flow Q(c) during the period when the filter is not clogged, and the curve C2 is the air flow Q during the period when the filter is not clogged (c) upper limit value. ΔH2 is the variation width of the static pressure H of the crevice nozzle 8 , and ΔQ2 is the variation width of the air flow rate Q(c) due to the crevice nozzle 8 .

Therefore, even if the filter of the main body of the vacuum cleaner is not blocked, as shown by the curve C1, the exhaust loss pressure is also relatively large. It still has a large air flow Q(c) value. This value is substantially equal to or greater than the lower limit value of the air flow Q(b) in the practical use range of the air flow shown in FIG. 3 .

As shown in FIG. 5 , curve D1 is the lower limit value of air flow Q(d) during filter clogging, and curve D2 is the upper limit value of air flow Q(d) during filter clogging.

As shown in FIG. 6 , the practical use range of the vacuum cleaner with the crevice nozzle 8 is between the air flow Q(c) and the air flow Q(d). As shown in FIG. 6 , the non-use range of the vacuum cleaner having crevice nozzle 8 is a range smaller than the air flow rate Q(d).

Curve C2 shows the exhaust loss pressure at the upper limit side of the fluctuation when the crevice suction nozzle 8 moves on the cleaning surface to be vacuumed. Since the opening of the crevice dust suction nozzle 8 is small, the crevice dust suction nozzle 8 is in close contact with the cleaning surface to be vacuumed. At this time, the exhaust pressure loss is relatively large. The variation width between the curves C1 and C2 is larger than the variation width between the curves A1 and A2 in the common floor cleaning nozzle 7 .

When the filter is clogged, the lower limit value of the air flow rate in the actual use range becomes the air flow rate Q(d). At this time, the exhaust loss pressure curve is represented by a curve D1, and the exhaust loss pressure curve on the fluctuation upper limit side is represented by a curve D2.

As described above, the air flow range Q(a)-Q(b) in the actual use range of a nozzle with a large opening such as the ordinary floor nozzle 7 is different from that of a nozzle with a small opening such as the crevice nozzle 8. The air flow range Q(c)-Q(d) in the actual use range is different. Comparing the typical examples shown in FIG. 3 and FIG. 5 , it can be seen that the air flow Q(a)>air flow Q(c), and the air flow Q(b)>air flow Q(d).

Corresponding to FIGS. 3 and 5 , the above-mentioned actually usable air flow range and the non-use range taken from the dust suction characteristic drop point are shown in FIGS. 4 and 6 .

As shown in the above figures, outside the actual use range, that is, in the air flow range greater than the air flow Q (a) and Q (c) and in the air flow lower than the air flow Q (b) and Q (d) Within the range, by greatly reducing the suction characteristic parameters, the power consumption and noise of the vacuum cleaner can be saved.

In order to obtain the above-mentioned suction characteristics, the suction nozzle is controlled. When Fig. 4 and Fig. 6 are combined into Fig. 7, it is easy to understand that if only one suction characteristic is used for control, it is impossible to obtain characteristics compatible with the two suction nozzles.

That is, in the range of the air flow rate smaller than the air flow rate Q(b), the resulting suction characteristic reduces the suction force. For a nozzle with a small opening such as the crevice nozzle 8, since the control suction force is lowered originally, there is a disadvantage that the suction force may become too weak for practical use.

In addition, in the range of the air flow rate smaller than the air flow rate Q(d), the resulting suction characteristic reduces the suction force. For the dust suction nozzle with a large opening such as the common floor dust suction nozzle 7, there is a disadvantage that the dust suction force of the dust suction nozzle may not be sufficient when used.

The problem in the prior art is that when different types of suction nozzles are used instead, such as the common floor suction nozzle 7 and the crevice suction nozzle 8 , the same suction characteristics are controlled for all types of suction nozzles.

That is, for example, even if it is the most suitable air flow rate for the ordinary floor cleaning nozzle 7, the exhaust loss pressure is too large for the crevice cleaning nozzle 8 with a small opening. Therefore, this will cause overheating of the electric drive fan motor, shortening the service life of the electric drive fan motor.

Similarly, for example, even for a crevice nozzle 8 with a small opening, which is the most suitable air flow, however, for an ordinary floor nozzle 7 with a large opening, this will result in insufficient suction air flow and suction. The problem of degraded properties.

In the above-mentioned conventional techniques, there is only one working characteristic to cope with the cleaning surfaces to be vacuumed such as rice, floor and carpet having different characteristics. This therefore hardly takes account of the precise control of the corresponding, suitable suction properties of the vacuumed cleaning surfaces which differ in each case.

Therefore, in general, the suction characteristic parameters are not sufficiently taken into account for the cleaning surface to be vacuumed according to the respective characteristics. Therefore, if the above-mentioned disadvantages are improved and the operation is automatically controlled, the suction characteristics of the vacuum cleaner will be greatly improved compared with the conventional vacuum cleaner.

In prior art vacuum cleaners, the electrically driven fan motor uses a chopper control system inverter to drive a brushless DC motor. A chopper control system of such a vacuum cleaner is disclosed in, for example, Japanese Patent Laid-Open No. 214219/1985. The inverter drives a brushless DC motor. In this vacuum cleaner, a predetermined suction force is obtained by controlling the number of revolutions in the brushless DC motor.

Also, so far, in the above-mentioned vacuum cleaner using the chopper control system inverter to drive the brushless DC motor, no attention has been paid to the protection of overload operation and the prevention of further high-speed rotation according to abnormal rotation number commands and the like.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vacuum cleaner having various nozzles of different air flow ranges for practical use, and a vacuum cleaner in which optimum suction characteristic parameters can be obtained.

Another object of the present invention is to provide a vacuum cleaner capable of saving electric power and having a low-noise structure during non-cleaning periods.

It is a further object of the present invention to provide a vacuum cleaner capable of automatically controlling the most suitable operating characteristics for different identified nozzles.

A further object of the present invention is to provide a vacuum cleaner capable of automatically discriminating the cleaning surface to be vacuumed based on a control device controlling suction characteristic parameters.

A further object of the present invention is to provide a vacuum cleaner capable of improving the suction characteristic parameters corresponding to the respective cleaned surfaces to be vacuumed.

A further object of the present invention is to provide a vacuum cleaner capable of presetting the most suitable suction characteristic parameters.

A further object of the present invention is to provide a vacuum cleaner capable of precise control based on suction characteristic parameters corresponding to the respective surfaces to be cleaned.

A further object of the present invention is to provide a vacuum cleaner having a chopper control system inverter driven brushless DC motor which can easily prevent overload operation.

A further object of the present invention is to provide a vacuum cleaner having a converter-driven brushless DC motor having a chopper control system capable of preventing high-speed rotation due to an abnormal rotation command value.

According to the present invention, the vacuum cleaner includes a detection device, which detects variables that vary with the operation of the dust suction nozzle, and the variables include static pressure, air flow and current, etc.; Drive the suction characteristic parameters of the fan motor.

When the suction nozzle works, the control device increases the suction characteristic, and when the dust suction nozzle stops working, the control device reduces the suction characteristic.

Set the first lower limit value of the air flow range during actual use, and set the second lower limit value on the small air flow side of the first lower limit value. When the air flow range is below the first limit value, the suction characteristics are greatly reduced.

In the air flow range between the first and second lower limit values, when the suction operation causes load changes, it can control the suction characteristic parameters to rise by a predetermined amount, and when there is no load change, it will maintain a lower level Suction characteristic parameters.

When it is detected that the change factors such as static pressure, air flow and current due to the work of the vacuum nozzle change, and when the change is greater than the predetermined amount within a predetermined time, it can be judged whether it is suitable for the working condition of the dust suction nozzle.

Therefore, by increasing the suction characteristic parameter by a predetermined amount, the suction force required for dust collection can be obtained. In addition, by reducing the suction characteristic parameter by a predetermined amount when no load variation is detected during a predetermined period, it is possible to save power and reduce noise of the vacuum cleaner.

According to the present invention, during the non-cleaning period when the dust suction nozzle is not working, the suction characteristic parameters are reduced, which can save electric energy and reduce the noise of the vacuum cleaner.

The suction characteristic parameter can be automatically improved according to the detected load variation caused by the operation of the dust suction nozzle, so that the suction characteristic parameter suitable for the dust suction operation can be obtained. And the suction characteristic parameters can be automatically controlled according to the frequency of the number of operations of the dust suction nozzle.

Only within the predetermined air flow range corresponding to the suction nozzle with a large opening and the suction nozzle with a small opening, and when installing a suction nozzle with a small opening, that is, a suction nozzle with a large load change during work, the suction characteristic parameters can be automatically controlled. Increase. Therefore, the most appropriate operation control can be automatically performed on the attached and judged nozzle.

According to the present invention, in the vacuum cleaner that can switch to use a variety of dust nozzles, it includes a device and a control device that the air flow ranges of the various dust nozzles in actual use are set in advance, and are used to replace the dust nozzles. Change from time to time and select the air flow range that is suitable for the respective nozzle situation.

When changing and using a variety of dust nozzles, and the air flow range is greater than the upper limit of the air flow when the corresponding dust nozzle is used, the dust nozzle moves up to the non-dust suction situation. In this case, by reducing the output of the electrically driven blower motor, it is possible to save electric energy and reduce the noise of the vacuum cleaner.

In addition, when a variety of dust suction nozzles are used, and the air flow range is less than the lower limit of the air flow when the corresponding dust suction nozzle is used, the dust suction capacity of the vacuum cleaner is insufficient. In this case, the user may notice that the filter has reached the limit of clogging due to the reduced output of the electrically driven blower motor. At the same time, by reducing the output of the electric fan motor, electric energy can be saved and the noise of the vacuum cleaner can be reduced.

In addition to the above, even when something thin such as a curtain sticks to the nozzle, absorption and release can be easily performed as the output of the electric drive fan motor drops.

According to the present invention, a vacuum cleaner comprises an electrically driven fan motor, detection means for detecting changes in working conditions of the vacuum cleaner, and control means for controlling the electrically driven fan motor according to the detection value of the detection means.

The vacuum cleaner includes a device that automatically selects and changes various suction characteristic parameters according to the variation of the operating situation. Changes in the operating conditions of the vacuum cleaner captured by load variations during reciprocation of the cleaned surface being vacuumed.

According to the pre-set working suction characteristic parameters, it can automatically detect the most appropriate working characteristic parameters for various vacuumed cleaning surfaces. Also, based on the detection result, an automatic control operation can be performed.

Thus, precise control can be performed to adapt the suction characteristics to the different properties of the cleaning surface being vacuumed. Therefore, the suction characteristic of the vacuum cleaner of the present invention can be improved as compared to conventional vacuum cleaners which have only one operating characteristic corresponding to a plurality of different properties of the vacuumed cleaning surface.

According to the present invention, when cleaning surfaces to be vacuumed with different properties, the change of the working conditions of the vacuum cleaner can be obtained according to the load variation of the dust suction nozzle of the vacuum cleaner, and various vacuumed surfaces can be automatically distinguished. Clean the surface.

According to the present invention, in the vacuum cleaner, the brushless DC motor of the electrically driven blower fan whose rotation is controlled by the inverter device of the chopper control system is installed, and the electric drive motor installed in the main body of the vacuum cleaner has 100% chopping power. Control the duty factor of the brushless DC motor in the work area.

In addition, the brushless DC motor is a synchronous motor with a permanent magnet as a magnetic field, and the inverter device controls the number of revolutions by changing the duty factor, so that the controlled number of revolutions brings it into a load state.

On the other hand, when the load is heavy and the duty factor is 100%, if the rotation speed does not rise to the controlled rotation speed, the brushless DC motor rotates at a value that balances the load torque.

The specification characteristics of the brushless DC motor are designed such that the counter electromotive force voltage generated in the rotor winding is equal to the power supply voltage. Therefore, in the case of a load greater than that described above, only the number of revolutions is reduced without causing an excessive increase in the input power.

That is, the amount of increase in current corresponding to the amount of counter electromotive voltage decreased by the decrease in the number of revolutions is limited to a predetermined amount.

Therefore, as in the case of non-dust collection, even if the load increases due to the large air flow flowing into the electric drive fan motor, it is possible to prevent the rapid increase of the input power.

Furthermore, when a high-speed active command value is output due to an abnormal condition of the control device, it is also possible to automatically prevent the number of revolutions from rising above a predetermined number of revolutions.

According to the present invention, in a vacuum cleaner that uses a chopper control system inverter to drive a brushless DC motor, it is possible to easily prevent overload operation without using a special protection device, and it is also possible to prevent damage caused by an abnormal rotation command value of the control device. Abnormal high-speed rotation. An improved vacuum cleaner is thus obtained.

Since the above-mentioned overload prevention control does not use the control processing program to avoid overload operation, it is very useful even in the worst case where the microcomputer breaks down from the viewpoint of reliability.

Moreover, near the upper limit of the allowable input power, when the load is large, the duty factor of the chopper control is almost 100%. Therefore, the chopper control does not work or works very little, and since the higher harmonic components caused by the interruption are small, the best state of system efficiency including the inverter device and the brushless DC motor can be realized. That is, on the high load side, the vacuum cleaner can achieve high efficiency, for example, can reduce temperature rise.

Fig. 1 is a block diagram according to an embodiment of the vacuum cleaner of the present invention and its control device;

Figure 2 is an outline drawing of a common floor vacuum nozzle and a crevice vacuum nozzle;

3 and 4 are aerodynamic suction characteristic graphs showing the relationship between the output characteristics of the electrically driven fan motor and the load characteristics of conventional floor cleaning nozzles;

5 and 6 are aerodynamic suction characteristic graphs showing the relationship between the output characteristics of the electrically driven fan motor and the load characteristics of the crevice suction nozzle;

Fig. 7 superimposes Fig. 4 and Fig. 6 together, is the aerodynamic suction characteristic curve diagram showing the relationship between the output characteristics of the electric drive fan motor and the load characteristics of common floor dust suction nozzles and crevice dust suction nozzles;

Fig. 8 is a graph showing the aerodynamic suction characteristic curve of the relationship between the output characteristic and the load characteristic of the electric drive fan motor of the present invention;

9 is an aerodynamic suction characteristic graph showing the relationship between output characteristics and load characteristics of an electrically driven fan motor according to an embodiment of suction characteristic control of the present invention;

FIG. 10A is a graph showing the relationship between the static pressure of the electrically driven fan motor and the suction time according to one embodiment of the suction characteristic control of the present invention;

FIG. 10B is a graph showing the relationship between the number of revolutions of the electrically driven fan motor and the suction time according to one embodiment of the suction characteristic control of the present invention;

Fig. 11 is an aerodynamic suction characteristic graph showing the relationship between another embodiment of the suction characteristic control according to the present invention and the load characteristic;

12A is a graph showing the relationship between the static pressure of the electrically driven fan motor and the dust collection time according to another embodiment of the suction characteristic control of the present invention;

Fig. 12B is a graph showing the relationship between the number of revolutions of the electrically driven fan motor and the suction time according to another embodiment of the suction characteristic control of the present invention;

Fig. 13 is an aerodynamic suction characteristic graph showing the relationship between the output characteristic of an electrically driven fan motor and the load characteristic in a conventional floor nozzle;

Fig. 14 is an aerodynamic suction characteristic diagram showing the relationship between the output characteristic of the electric drive fan motor and the load characteristic in the cracked floor cleaning nozzle;

Fig. 15 is a flow chart of judging the air flow in the switching control according to the present invention;

Fig. 16 is a graph showing the relationship between vacuum degree and air flow rate, which shows the operating characteristics in a corresponding nozzle;

Fig. 17 is a graph showing the relationship between vacuum degree and air flow rate, which shows the operating characteristics of a corresponding nozzle and the load variation of a corresponding nozzle;

Fig. 18 is a control block diagram of a control device according to another embodiment of the present invention;

Fig. 19 is an overall structural diagram showing a speed control device comprising a brushless DC motor and a converter control device of another embodiment of the vacuum cleaner of the present invention;

Figure 20 and Figure 21 are characteristic curves of a vacuum cleaner using a brushless DC motor as a driving source;

Fig. 22 is a characteristic graph of a vacuum cleaner with an input limiting function.

An embodiment of the present invention is explained below with reference to the drawings.

FIG. 1 is a structural block diagram of a vacuum cleaner 1 and its control device 6 . The vacuum cleaner 1 mainly includes an electric-driven fan motor 2 , a main body 3 of the vacuum cleaner, a filter 4 for filtering dust, and a dust collection box 5 . The control device 6 is shown in a block diagram on the outside of the vacuum cleaner main body 3, and the control device 6 is placed in the vacuum cleaner main body 3 in the form of circuit hardware or microcomputer software.

The control device 6 includes an execution and processing device 10 that executes and processes the detection value of the detection device 9 and outputs a control value to the power control device 11 and a power source 12 that provides electric energy to the above-mentioned devices. The execution and processing device 10 includes a judging device 13 such as a suction nozzle.

The detecting device 9 detects various variable factors of the electrically driven fan motor 2 through such as an air flow sensor, a pressure sensor, a current sensor and a revolution sensor. This variable factor varies with the working conditions of the vacuum cleaner 1 . The detection device 9 directly outputs the measured quantity or a combination of measured quantities indicative of the air flow, and uses the execution and processing device 10 to obtain the air flow indirectly.

A determination device 13 such as a nozzle is included in the execution processing device 10 . The discriminating device 13 discriminates in the form of the above-mentioned variation factors such as the interval of variation width and variation time, and further discriminates the type of the nozzle installed on the main body 3 of the vacuum cleaner.

That is, as in the above explanation of Fig. 3 and Fig. 4, the discrimination of the fluctuation width ΔH1 or ΔQ1 of the static pressure H or the air flow rate Q due to the operation of the general floor cleaning nozzle 7 will be exemplified below.

In the general floor cleaning nozzle 7 with a large opening, the variation width is small. However, the variation width is large in the crevice nozzle 8 with a small opening. Therefore, the type of the nozzle can be discriminated by using a predetermined judgment value.

That is, as long as there is a large amount of change greater than the predetermined judgment value, it can be judged whether it is the work of the dust suction nozzle with a small opening such as the crevice dust suction nozzle 8 or the like. This function can be performed by a circuit, however, it is more suitable that under the overall structure of the execution and processing device 10, this function is composed of the control software of the microcomputer.

The suction characteristic parameters controlled by the above structure will be explained below with reference to the dotted line portion of FIG. 8 by way of example.

That is, the first lower limit value of the actually used air flow range is set to the air flow rate Q(b), and the second lower limit value is set to the air flow rate Q(d). When the air flow range is lower than the air flow Q(b), it is controlled at the low suction characteristic parameter shown by the curve P2, and passes through the path (0)→(1)→(2)→(3)→ (4)→(5) The route works on the high suction characteristic parameter shown by the curve P3.

When the vacuum cleaner 1 is working in the air flow range between the air flow Q(b) and the air flow Q(d), according to the fluctuation amount, the fluctuation width of the detected value of the detection device 9 is greater than the predetermined judgment value, and every predetermined interval If the amount of variation is within the predetermined range, it can be determined that the crack nozzle 8 with a small opening is mounted on the vacuum cleaner main body 3 and can further determine that the crack nozzle 8 is working under actual use conditions.

The execution and processing device 10 commands and controls the vacuum cleaner 1 to increase predetermined suction characteristic parameters according to the electric signal of the judging device 13 having the above-mentioned functions. Thus, the vacuum cleaner 1 can work on the curve P4 (route (6)→(7)→(8)), which shows low suction characteristic parameters. Curve P4 is represented by a chain-dotted curve. It is suitable for the crevice suction nozzle 8 with small openings.

When there is no variation greater than the judgment value within a predetermined interval, this is a non-vacuum situation where the nozzle does not work or a situation where the general floor nozzle 7 with a large opening is not installed. In the latter case, it produces the curve P2 (route (4)→(5)), which shows the case of low suction characteristic parameters, and thus, saves electric power and reduces the noise of the vacuum cleaner 1 .

As described above, by detecting the magnitude of the load fluctuation width, the fluctuation amount within a predetermined interval, and the air flow movement point, it is possible to automatically obtain the most suitable suction characteristic parameters for the installed nozzle.

9-12B will explain another embodiment of controlling the increase and decrease of the puff characteristic parameters. Comparing Fig. 9, Fig. 10A and Fig. 10B, Fig. 10A and Fig. 10B show an example, where the abscissa represents the working time, and then the variation value of the load is detected along with the variation of the static pressure.

In FIG. 9, curves _PI and _PI are output suction characteristic curves, and curves E1 and E2 are exhaust loss pressure characteristic curves.

In Fig. 10A and Fig. 10B, when there is no static pressure change ΔH caused by load variation during the predetermined interval T, the suction characteristic parameter is maintained at the static pressure H _I , wherein the rotation number N of the electrically driven fan motor 2 is N _I . In each predetermined detection interval T, if it is necessary to rely on more than one variable width △H _I exceeding the predetermined judgment value, as shown in Figure 10B (A), it can work at the static pressure rising to H _I , and the number of revolutions is N _I becomes a high suction characteristic parameter.

According to this, when not depending on the variation width ΔH _I , as shown in part (B) of Fig. 10B, the number of revolutions returns to the original number of revolutions N _I , which can be operated under low suction characteristic parameters.

The control described above is the basic control of the vacuum cleaner 1 . When the number of revolutions N of the electrically driven blower motor in parts (A) and (B) of Figure 10B changes frequently and repeatedly at each predetermined detection interval T due to fluctuations, the suction parameters change rapidly and repeatedly within a short interval . Since it causes variations such as ticking and vibrations of the vacuum cleaner 1, it is possible to slow down the response of the suction characteristic parameter when the predetermined time interval T of the detected no-load variation lasts n times (nXT), thereby make it lower.

In FIG. 11, curves Pa, Pb, Pc, and Pd are output suction characteristic curves, and curve F is a discharge loss pressure characteristic curve.

11, 12A and 12B, it can be seen that the vacuum cleaner 1 increases or decreases the suction characteristic parameter in proportion to the static pressure H variation caused by the nozzle operation during the predetermined interval T of detection.

On the other hand, the vacuum cleaner 1 increases or decreases the suction characteristic parameter in response to detecting the variation amount of the static pressure H caused by the operation of the nozzle during the predetermined interval T.

At this time, when the static pressure H does not fluctuate for a long time, the original low static pressure value Ha of the suction characteristic parameter is used as the set value. The static pressure value Ha is set as Hmin(1), ie Ha=Hmin(1), and the vacuum cleaner works at the number of revolutions Na.

In the case that the number of times of work of the dust suction nozzle is small, that is, the number of fluctuations is between the low number of work of the dust suction nozzle such as once and twice in each detection predetermined interval T, the minimum static pressure Hb of the suction characteristic parameter is determined. as a set value. This static pressure Hb is set as Hmin(2), that is, Hb=Hmin(2).

Secondly, with the increase of the fluctuation amount of the static pressure H caused by the operation of the dust suction nozzle in each predetermined interval T of detection, the vacuum cleaner is operated with the number of revolutions Nc and Nd, so that the static pressure Hc and the static pressure Hc are increased by each predetermined amount. Hd pumping characteristic parameters.

In Fig. 12A and Fig. 12B, in the case that the number of operands is large, that is, the suction nozzle is working in a large number and at a high frequency, the static pressure value Hd with the largest suction characteristic parameter is taken as the set value, and the static pressure value Hd Set as Hmax, ie Hd=Hmax.

When the workload of the cleaning nozzle is reduced, corresponding to the frequency, the suction characteristic parameters of the vacuum cleaner 1 are reduced.

As described above, the suction characteristic parameter of the vacuum cleaner 1 becomes stronger under fast working conditions and weaker under slow working conditions. Therefore, the automatic control of the suction characteristic parameters can be realized, and the user's feeling and needs can be adapted.

Moreover, since the setting on the side of the lower limit of the suction characteristic parameter is divided into two steps, that is, Ha=Hmin(1) and Hb=Hmin(2), the necessary suction nozzle can be obtained at least once more than once. suction power. Therefore, when the user does not really use the vacuum cleaner 1 or the user does not operate the vacuum nozzle for a long time, the suction force can be greatly reduced to save the power consumption of the vacuum cleaner.

In addition, the control range of the above-mentioned air flow rate is between the air flow rate Q(b) and the air flow rate Q(d) in the example in FIG. 8 . However, the control range of the air flow rate Q is not limited to the range of the above example.

Since the suction characteristic parameters are controlled according to the occurrence of load fluctuations and their fluctuations according to the working conditions of the dust suction nozzle within the range of the entire air flow rate, therefore, in the non-dust collection situation where the dust suction nozzle is not working, it can be Save electricity and reduce vacuum cleaner noise.

Also, since the suction characteristic parameter is controlled corresponding to the operating frequency of the nozzle, an effect similar to that described above can be obtained at this time.

Another embodiment of the vacuum cleaner of the present invention will be explained below with reference to the accompanying drawings.

As described above, in the general floor nozzle 7 with a large opening, the fluctuation width is small. However, in the crevice nozzle 8 with a small opening, since sticking and releasing are repeated, the variation width is large. Therefore, it is entirely possible to discriminate such a suction nozzle according to a predetermined judgment value.

That is, according to the judgment path of the flow shown in Figure 15, the air flow upper limit value of the control change or the air flow lower limit value of the control change or the upper limit and the lower limit value of the air flow rate of the control change are both updated to preset predetermined value.

Next, an example of controlling the suction characteristic parameters of the vacuum cleaner 1 having the above structure will be explained with reference to FIGS. 13 and 14. FIG.

In FIG. 13, curves P11, P12, and P13 are output suction characteristic curves. In FIG. 14, curves P14, P15, and P16 are output suction characteristic curves.

That is, FIG. 13 shows the case where the detection value fluctuation width is small. It is judged on the route side of Fig. 15A. This applies to the case of a large opening nozzle such as the common floor nozzle 7, where the upper control limit of the air flow Q(a1) and the lower control limit of the air flow Q(b1) are set.

Also, these control limits correspond to the maximum air flow without clogging of the filter 4 when the nozzle is in contact with the floor within the practical range of use of the general floor cleaning nozzle 7 with a large opening and dust suction when the filter 4 is clogged. The air flow lower limit value of the characteristic parameter is set separately.

Furthermore, curves P11 , P12 , and P13 in FIG. 13 are output characteristic curves of the electrically driven fan motor 2 . The output characteristic curves P11, P12 and P13 are pre-set to be suitable for the above-mentioned common floor cleaning nozzle 7 with a large opening, and predetermined suction characteristic parameters can be obtained by changing the suction characteristic curves.

That is to say, the route (0)→(1)→(2)→(3)→(4)→(5)→(6)→(7) in Figure 13 is greater than the upper air flow Q(a1) The range of the limit value and the range of the lower limit value smaller than the air flow rate Q(b1) exceed the range for practical use. Therefore, without outputting an unnecessary output, it can be operated with a low output characteristic parameter as shown by the curve P11.

The range of the route (0)→(1) greater than the upper limit of the air flow Q(a1) in FIG. 13 is a non-dust suction situation such as the suction nozzle is moved up. In this above case, as shown by the route (0)→(1) in FIG. 13, by reducing the output, it is possible to save power and reduce the noise of the vacuum cleaner.

In addition, in the range of route (6)→(7) which is less than the lower limit value of the air flow rate Q(b), the dust suction capability is insufficient. In this case, as shown in route (6)→(7) in Figure 13, by reducing the output, the user can notice that the filter 4 has been clogged to the limit, and at the same time, it can save power and reduce the noise of the vacuum cleaner Effect.

In addition to the above, even light and thin materials such as curtains are attracted and tightly adhered to the nozzle, so that when the air flow rate is reduced, the nozzle can be easily released and vacuumed by reducing the suction characteristic parameter.

In addition, in FIG. 13 , the air flow range Q( a1 )-Q( b1 ) is an actual application range at the time of actual cleaning. In this practical use range, the most suitable suction characteristic parameters suitable for common floor cleaning nozzles 7 with large openings can be realized.

In the embodiment shown in FIG. 13, control can be performed by commands from the execution and processing means 10. FIG. That is, on the output characteristic curve P13 shown in the route (2)-(3) or the output characteristic curve P12 shown in the route (4)-(5), it can be between the route (3)→(4) change between.

Also, in this example, two output characteristic curves in the actual use range of the actual dust collection situation are shown, however, it is not limited to two characteristic curves, and it can be changed and combined by a large number of output characteristic curves .

Fig. 14 shows the case where the detection value fluctuation width is large, which is judged on the route side in Fig. 15B. This situation is applicable to the case of the small opening of the crack suction nozzle 8, where the upper control limit of the air flow Q(c1) and the lower control limit of the air flow Q(d1) are set.

Furthermore, curves P14 , P15 , and P16 in FIG. 14 are output characteristic curves of the electrically driven fan motor 2 . The output characteristic curves P14, P15 and P16 are preset to be suitable for the above-mentioned crevice nozzle 8 with a small opening. Similar to the example shown in Figure 13, by changing the curve, it can be achieved through (0)'→(1)'→(2)'→(3)'→(4)'→(5)'→(6)' →(7)' The pumping characteristics of this route.

Figure 14 differs from the embodiment shown in Figure 13 in that in Figure 13 the values of the air flow Q(1) and the air flow (d1) are changed, and the air flow Q(c1)-Q( The suction characteristic parameters between d1) are also changed.

In Fig. 14, the curve P14 representing the output characteristic parameter of the electric drive fan motor 2 is set to be equal to the curve P11 shown in Fig. 13, and the output characteristic parameter representing the electric drive fan motor 2 is also set to be equal to Fig. Curve P12 shown in. However, it is not necessary to limit the curves P14 and P15 shown in FIG. 14 like the curves P11 and P12 in FIG. 13 .

As mentioned above, the type of the nozzle can be judged according to the variation width of the measured value. According to the judgment command, the nozzle installed on the main body 3 of the vacuum cleaner can be operated with the most appropriate suction parameters within the air flow range. The parameters work.

In addition, in the above-mentioned embodiment, the case where the size of the fluctuation width is judged by the predetermined judgment value, and the type of the nozzle is judged was exemplified.

However, it is also possible to compare the variation width with a plurality of provided discrimination values to discriminate the type of the nozzle, so that the operating characteristic parameters can be controlled according to the most suitable conditions for each nozzle.

Furthermore, the type of the nozzle can be determined not only by the variation width of the detected value but also by discriminating the variation pattern or the variation state by sampling at predetermined intervals.

Still another embodiment of a vacuum cleaner with a brushless DC motor of the present invention will be explained with reference to the accompanying drawings.

An example of operating characteristic parameters of a vacuum cleaner is shown in FIG. 16 . Fig. 16 is a characteristic curve of vacuum degree-air flow rate, which shows an example of the operating suction characteristic parameters of the vacuum cleaner of the present invention.

In FIG. 16 , the operating characteristic parameter A2 is used when the surface to be cleaned is the floor. The working characteristic curve is a combination of constant air flow Q24 and constant vacuum H22, and when it is less than air flow Q21, it works at constant vacuum H21.

Similar to the above, the working characteristic curve B2 is used when the vacuumed cleaning surface is tata rice, and the working characteristic curve C2 is used when the vacuumed cleaning surface is a carpet. In the operating characteristic curve C2 for carpets, the characteristic curve between the air flows Q21 and Q22 is a downward sloping characteristic curve when the electrically driven fan motor is operated at a constant rotational speed operating characteristic parameter.

In each of the above-mentioned operating characteristic curves, when the air flow rate is less than Q21, they all work at a constant vacuum degree H21. That is, when the air flow rate is less than the air flow rate Q21, the air flow rate is within the range of the decrease in the air flow rate due to clogging of the filter in the vacuum cleaner. This range is not the actual use range during the use of the vacuum cleaner, and there is only one working characteristic curve.

The operation of the above-mentioned constant air flow rate, constant vacuum degree and constant rotation number of the electrically driven fan motor will be explained below according to an embodiment.

Next, the means for correctly determining and selecting a plurality of operating suction characteristic curves and further switching to the most suitable operating suction characteristic curve for each cleaned surface to be vacuumed will be explained.

That is to say, in the case of using the vacuum cleaner 1, when the dust nozzle reciprocates on the cleaned surface to be vacuumed, the degree of suction between the dust suction nozzle and the cleaned surface to be vacuumed, the vacuum inside the vacuum cleaner The temperature, the current of the electric drive fan motor and the suction air flow rate of the electric drive fan motor will change. The above variation can be used as the variation of the working condition of the vacuum cleaner.

Note that when the same nozzle is used, the above-mentioned variation of the vacuum cleaner, that is, the variation of the degree of vacuum, current and air flow caused by the reciprocating motion of the vacuum cleaner’s nozzle, is different from the above-mentioned variation according to the vacuumed cleaning surface. The amount is different. Therefore, it can judge the kind of the cleaning surface being vacuumed, and then change the operation characteristic parameter corresponding to the result of the judgment.

The above situation will be explained in more detail with reference to FIG. 17 . FIG. 17 is an overlay of the load variation curve and the vacuum degree-air flow characteristic curve shown in FIG. 16 during the reciprocating motion of the suction nozzle on the surface to be cleaned.

In FIG. 17, curves a2, b2, c2, and d2 are load characteristic curves of the nozzle. In Fig. 17, when the floor is vacuumed, the load curve of the nozzle will change between curve a2 and curve b2 when the nozzle of the vacuum cleaner moves back and forth on the floor.

In addition, when the vacuum cleaner is tata rice, the load curve of the nozzle will change between curve a2 and curve c2 when the nozzle of the vacuum cleaner reciprocates on the tata rice.

In addition, when the vacuum cleaner is a carpet, when the nozzle of the vacuum cleaner moves back and forth on the carpet, the load curve of the nozzle will vary between the curve a2 and the curve d2.

Therefore, when the vacuum cleaner operates under the operating characteristic curve A2 and vacuums the carpet, the moving point on the operating characteristic curve A2 is between points (e) and (f) at a constant air flow rate Q24. At this time, the degree of vacuum varies between H(e) and H(f) according to the reciprocating motion of the nozzle of the vacuum cleaner 1 . V represents the variation width of vacuum degree.

In addition, when the vacuum cleaner works under the operating characteristic curve A2 and vacuums tata rice, the variation width of the vacuum degree on the characteristic curve A2 is W.

In addition, when the vacuum cleaner works under the working characteristic curve A2 and vacuums the floor, the variation width of the vacuum degree on the characteristic curve A2 is X.

As mentioned above, when the air flow rate of the vacuum cleaner is constant, the type of the cleaned surface to be vacuumed can be determined according to the variation width of the vacuum degree.

In addition, when vacuuming the same carpet, the variation width of vacuum degree is Z under the condition of constant air flow Q22, and the variation width of vacuum degree is Y under the condition of constant air flow Q23. This fact applies in the case of vacuuming the same tata rice or the same floor.

Another scheme can also be adopted, the above-mentioned discrimination threshold can be divided by the average value of the vacuum degree change width, so that various discrimination values can be combined into one discrimination value to form a dimensionless vacuum degree change rate.

In addition, in the above case, it is also an example of using a change in the degree of vacuum as a change in the working condition of the vacuum cleaner 1 under a constant air flow rate Q.

Instead of the above, the amount of change in the current of the electrically driven fan motor 2 that changes with the load of the nozzle of the vacuum cleaner can also be regarded as a change in the working condition of the vacuum cleaner 1 .

In addition, during the constant vacuum operation, the change of the air flow rate Q and the change of the current can be regarded as the change of the working condition of the vacuum cleaner. During constant revolution operation, changes in vacuum degree, air flow Q and current can be regarded as changes in working conditions of the vacuum cleaner.

Next, the control method of the above-described embodiment of the present invention will be explained with reference to FIG. 18. FIG. Fig. 18 is a control block diagram of one embodiment of the vacuum cleaner of the present invention.

In this embodiment, the brushless DC motor 25 is used for the electric fan motor, and the rotation speed is controlled by the inverter.

In FIG. 18 , the commercial power (AC 100V) from the socket (not shown) is rectified into direct current through the conversion part 21, and then the direct current is sent to the converter part 23 through the current detection part 22. The inverter part 23 is controlled by the starting signal from the main control circuit 24 to generate three-phase alternating current, and supplies it to the brushless DC motor 25 .

The brushless DC motor 25 is equipped with a rotor position detection sensor 26, and feeds back the position of the rotor to the main control circuit 24. Also, a pressure sensor 27 that detects the degree of vacuum inside the vacuum cleaner is connected to the main control circuit 24 .

In the above structure, when the vacuum cleaner works at a constant air flow rate, the rotation number of the brushless DC motor 25 can be controlled negatively by using the air flow sensor and the output power.

However, in this embodiment of the present invention, since no air flow sensor is installed, it calculates the number of revolutions of the brushless DC motor 25 based on the current value from the current detecting portion 22 and the rotor position detecting sensor 26 . The air flow is obtained from the execution of these values and works at constant air flow according to this air flow.

In addition, the operations under constant vacuum and constant revolution are controlled by pressure sensor 27 and rotor position detection sensor 26, respectively.

According to the above structure, the vacuum degree, the air flow rate and the current value of the brushless DC motor 25 are always monitored as changes in the working conditions of the vacuum cleaner 1, and then the working suction characteristics of the vacuum cleaner are changed according to the changes in the working conditions.

Still another embodiment of the vacuum cleaner of the present invention will be explained with reference to the accompanying drawings.

A vacuum cleaner having an improved brushless DC motor is explained below with reference to FIGS. 19-22 . FIG. 19 is an explanatory diagram of the entire structure of the speed control device, showing the speed control device including the brushless DC motor 36 and the inverter control device 31. As shown in FIG.

Fig. 20 and Fig. 21 are the suction characteristic curve diagrams of the vacuum cleaner using the chopper control system converter to drive the brushless DC motor 36 as the driving device, and Fig. 22 is the suction characteristic curve of the vacuum cleaner with the input power limiting function according to the present invention. suction characteristic curve.

In FIG. 19, the entire structure of the speed control device is shown. The converter control device 31 obtains the DC voltage Ed from the AC power source 32 through the rectification circuit 33 and the smoothing circuit 34, and supplies it to the converter device 35.

The converter device 35 is a 120° resistive converter including transistors TR1-TR6 and freewheeling diodes D1-D6. The AC output voltage of the conversion device 35 is controlled according to the chopping operation of the conduction voltage side (conduction angle 120°) of the transistors TR1-TR3 on the positive voltage side of the DC voltage Ed by receiving pulse width modulation.

In addition, a small resistor R1 is connected between the common emitter terminals of transistors TR4-TR6 and the common positive terminals of freewheeling diodes P4-P6. The brushless DC motor 36 includes a rotor 36a having a bipolar permanent magnet as a magnetic field and a stator in which a rotor coil 36b is inserted. The coil current flowing in the rotor coil 36b also flows to the small resistor R1, and the load current _ID of the brushless DC motor 36 is detected based on the voltage drop across the small resistor R1.

The control circuit for controlling the speed of the brushless DC motor 36 has a microcomputer 37 including CPU, ROM and RAM, and a magnetic pole position detection circuit 39 that detects the magnetic pole position of the rotor 36a by receiving output power from the element 38, and detects the load based on the voltage drop on the small resistor R1 A current detection circuit 40 for the current _ID , a base driver 41 for driving the transistors TR1-TR6 and a speed command circuit 42 for transmitting the standard speed to the microcomputer 37.

The current detection circuit 40 detects the load current ID by receiving the voltage drop across the small resistor R1 and generates a current detection signal 40S by an A/ _D converter (not shown).

In the ROM in the microcomputer 47, various processing programs necessary for driving the brushless DC motor 36, such as a speed execution processing program, a command reception processing program, and a speed control processing program, are stored.

In addition, the RAM in the microcomputer 47 contains a storage section for receiving various data necessary for executing various processing programs described above.

Transistors TR1-TR6 receive start signal 37S from microcomputer 37 and are driven by base driver 41 .

The voltage command circuit 43 forms a chopping signal. That is, in the brushless DC motor 36, the coil current flowing to the rotor coil 36b corresponds to the output torque of the brushless DC motor 36, and the coil current is controlled at each rotational position, therefore, the output torque can be controlled. for continuous control.

FIG. 20 is a suction characteristic curve of a vacuum cleaner using a brushless DC motor 36 as a driving source. The horizontal axis is the air flow Q flowing through the vacuum cleaner, and the vertical axis plots the static pressure of the suction force of the vacuum cleaner, the rotation number N of the brushless DC motor 36 and the input power W _i .

The range of movement of the vacuum cleaner is from a maximum movement point Q31 to a minimum movement point Q32. The vicinity of the maximum movement point Q31 corresponds to the situation that the suction nozzle is far away from the cleaning surface to be vacuumed, and at this time, it needs the maximum power.

In addition, as shown in FIG. 21, the most suitable suction characteristics can be obtained as required for the vacuum cleaner, that is, according to appropriate selection of each curve corresponding to various rotation numbers and conversion operation control, as shown in FIG. 20 As a combination of basic suction characteristic parameters.

However, looking at the limitation of the input power Wi, it is not good to use it in a range larger than the allowable input power upper limit W _i from the viewpoint of the current capacity and temperature rise of the control unit.

For example, when N ₁ is selected as the number of revolutions at the point of air flow Q33, and the input power W _i exceeds the allowable input power upper limit W ₁ , an overload situation will occur.

When the above-mentioned input power W _i is greater than the allowable input power charging upper limit W ₁ , use the processing program of the control device to reduce the rotational speed command value to the rotational speed N ₂ or the rotational speed N ₃ to avoid the occurrence of overload. On the other hand, however, it has a disadvantage that the processing program of the control device becomes relatively complicated.

In addition, it is also possible to use a dedicated overload monitoring device, however, with such a device, there are disadvantages in that the cost increases or the device is bulky.

In this embodiment of the present invention, as the actual range of use of the vacuum cleaner, its target is in the range from the air flow Q33 to the air flow Q31 of the non-dusting situation when the dust suction nozzle is lifted, and there is no need to generate more than the specified vacuum. Forced suction. Therefore, in this embodiment of the present invention, the input power W _i can be automatically limited around the above range.

That is, counter electromotive force is generated on the above-mentioned rotor coil 36 portion corresponding to the rotation of the rotor 36a. As shown in FIG. 22, the magnetomotive force of the rotor 36a and the number of turns of the rotor coil 36b are set so that the power supply voltage balances the counter electromotive force, and they are set so that the air flow rate Q in the case of 100% duty cycle load becomes the air flow rate Q34.

Therefore, on the side of the large air flow Q compared with the air flow Q34, the number of revolutions N4 gradually decreases from the command value of the load increase, and the input power W _i gradually increases and saturates. Therefore, the increase of the input power W _i can be automatically controlled with a predetermined value smaller than the allowable input upper limit W ₁ .

As described above, even when operating at any speed command value, the increase of the input power W _i can be automatically limited on the heavy load side where the duty factor of the chopper control is greater than 100%.

In addition, even when the high-speed command value is output due to abnormality of the speed command circuit 42 and the microcomputer 37, abnormal high-speed operation can be automatically prevented on the brushless DC motor 36 side of the electric device.

Claims (28)

1. A vacuum cleaner, which comprises a detection device for detecting variable factors that vary with the work of the dust suction nozzle, said variable factors are static pressure, air flow and current, etc.; and a control device for Corresponding to the detection amount of the detection device, the suction characteristic of the electric drive fan motor is controlled, and it is characterized in that, When the dust suction nozzle is working, the control device increases the suction characteristic parameter, and when the dust suction nozzle stops working, the control device decreases the suction characteristic parameter. 2. The vacuum cleaner according to claim 1, wherein said control means sets an upper limit value for increasing the suction characteristic parameter, and said control means sets a lower limit value for decreasing the suction characteristic parameter. 3. A vacuum cleaner, the vacuum cleaner includes a detection device for detecting the change factors that change with the work of the dust suction nozzle, the change factors are static pressure, air flow and current, etc.; and a control device, with Control the suction characteristic parameters of the electric drive fan motor according to the detection amount corresponding to the detection device, characterized in that, When the suction nozzle does not work for more than a predetermined time, the control device reduces the suction characteristic parameter to a predetermined suction characteristic parameter. 4. A vacuum cleaner as claimed in claim 1, characterized in that, if the nozzle is present every predetermined time, when it operates, the suction characteristic is gradually increased to every predetermined amount of suction in proportion to the number of operations. The suction characteristic parameter; when it is not working, the suction characteristic is gradually reduced to every predetermined amount of the suction characteristic parameter proportional to the operand. 5. The vacuum cleaner according to claim 4, characterized in that an upper limit value for increasing the suction characteristic parameter and a lower limit value for decreasing the suction characteristic parameter are set. 6. The vacuum cleaner according to claim 2, characterized in that, when the suction nozzle does not work for more than a predetermined time, the control suction characteristic parameter is reduced to another limit value, so that it becomes a predetermined value greater than the above-mentioned lower limit value. Low suction characteristic parameters. 7. A vacuum cleaner as claimed in claim 1, characterized in that, if the nozzle is present at every predetermined moment, when it is in operation, the suction characteristic is gradually increased to every predetermined amount of suction in proportion to the number of operations. The suction characteristic parameter; when it is not working, the suction characteristic is gradually reduced to every predetermined amount of the suction characteristic parameter proportional to the operand. 8. The vacuum cleaner according to claim 7, wherein an upper limit value for increasing the suction characteristic parameter and a lower limit value for reducing the suction characteristic parameter are set. 9. The vacuum cleaner according to claim 1, characterized in that, if the nozzle is present at every predetermined time, when it operates, the suction characteristic parameter is controlled to a value proportional to the operand or to The value of a predetermined function; when it is not operating, the suction characteristic is gradually reduced to each predetermined amount of the suction characteristic or the suction characteristic parameter is reduced by a predetermined amount of function. 10. The vacuum cleaner according to claim 9, characterized in that an upper limit value for increasing the suction characteristic parameter and a lower limit value for reducing the suction characteristic parameter are set. 11. A vacuum cleaner having multiple nozzles that can be used interchangeably, characterized in that, The vacuum cleaner which pre-sets the range of air flow of the various nozzles in actual use includes a control device for changing and selecting the range of air flow suitable for the corresponding vacuum cleaner when changing the nozzles. 12. A vacuum cleaner with interchangeable nozzles, characterized in that: The vacuum cleaner comprises an air flow detection device for detecting the suction air flow during dust collection when controlling the suction characteristic parameters of the electric drive fan motor according to the detection value of the air flow detection device; and a control device, It is used to set the upper limit value of each of the air flow corresponding to the opening size of the various dust nozzles and to control and reduce the air flow when the air flow is greater than the upper limit of each of the dust nozzles. The suction characteristic parameters described above. 13. The vacuum cleaner according to claim 12, characterized in that, the vacuum cleaner further comprises a nozzle discrimination device, which is used to detect the noise caused by the operation of the nozzle, such as static pressure, air flow rate, etc. , the variation width of variation factors such as electric current and the variation state of variation factors to judge the type of dust nozzle, and an air flow value changing device, which is used to change and control the upper limit value of air flow according to the signal of the dust nozzle judging device. 14. The vacuum cleaner according to claim 13, characterized in that, the vacuum cleaner further comprises a device for changing the determination position according to the air flow value when the air flow is less than the upper limit value of the controlled air flow, and controls to a Predetermined suction characteristic parameters. 15. A vacuum cleaner having a plurality of interchangeable nozzles, characterized in that, The vacuum cleaner comprises an air flow detection device for detecting the suction air flow during dust collection when controlling the suction characteristic parameters of the electric drive fan motor according to the detection value of the air flow detection device; and a control device, Corresponding to the opening sizes of the various types of dust nozzles, setting the multiple lower limit values of the air flow rates, and when the air flow rates are smaller than the respective lower limit values of the various types of dust suction nozzles, Control is performed to reduce the suction characteristic parameter. 16. The vacuum cleaner according to claim 15, characterized in that, the vacuum cleaner further comprises a nozzle judging device, which is used to detect the noise caused by the operation of the nozzle, such as static pressure, air flow rate, etc. , the variation width of variation factors such as electric current and the variation state of variation factors, to distinguish the type of dust suction nozzle; and an air flow changing device, which is used to change and control the lower limit value of air flow according to the signal of the dust suction nozzle discrimination device. 17. The vacuum cleaner according to claim 16, characterized in that, the vacuum cleaner further comprises, when the air flow rate is greater than the lower limit value of the controlled air flow rate, changing the determination position of the device according to the air flow value, and controlling to A device for predetermined suction characteristic parameters. 18. A vacuum cleaner with interchangeable nozzles, characterized in that: The vacuum cleaner comprises an air flow detection device, which is used to detect the suction air flow during dust collection when controlling the suction characteristic parameters of the electric drive fan motor according to the detection value of the air flow detection device; and a control device, To correspond to the opening sizes of the various types of nozzles, set multiple upper limits of the air flow and multiple lower limits of the air flow, and when the air flow is greater than the various types of nozzles When the respective upper limit values of each of the suction nozzles are smaller than the respective lower limit values of the various types of nozzles, control is performed to decrease and increase the suction characteristic parameters. 19. The vacuum cleaner according to claim 18, characterized in that, the vacuum cleaner further comprises a nozzle judging device, which is used to detect such as static pressure, air flow rate, Distinguish the type of the dust suction nozzle according to the variation width of the variation factors such as electric current and the variation state of the variation factors; lower limit. 20. The vacuum cleaner according to claim 19, characterized in that the vacuum cleaner further comprises: when the air flow rate is less than the upper limit value of the controlled air flow rate and when the air flow rate is greater than the lower limit value of the controlled air flow rate, according to the A device for controlling the determination position of the air flow value changing device to a predetermined suction characteristic parameter. 21. A vacuum cleaner, which comprises an electric-driven fan motor, a detection device for detecting changes in the working conditions of the vacuum cleaner, and a control device for controlling the electric-driven fan motor according to the detection value of the detection device, wherein characterized in that, The vacuum cleaner includes a device for changing the amount of change in suction characteristic parameters expressed by the degree of vacuum and air flow when the vacuum cleaner is working, and according to the reciprocating movement of the dust suction nozzle of the vacuum cleaner on the cleaned surface being vacuumed. According to the change of the working condition of the vacuum cleaner obtained by the load change, various suction characteristic parameters are automatically selected and changed. 22. A vacuum cleaner, which comprises an electric-driven fan motor, a detection device for detecting changes in the working conditions of the vacuum cleaner, and a control device for controlling the electric-driven fan motor according to the detection value of the detection device, its features is that The vacuum cleaner comprises a device for operating the vacuum cleaner according to the operating characteristic parameter of constant air flow, the operating characteristic parameter of constant vacuum degree, and the operating characteristic parameter of constant vacuum revolution of the electric drive fan motor. Automatically select and change a variety of suction characteristics according to the variation of the various suction characteristic parameters and the change in the working condition of the vacuum cleaner obtained by the load change caused by the reciprocating movement of the suction nozzle of the vacuum cleaner on the cleaned surface. parameter. 23. A vacuum cleaner as claimed in claim 21 or 22, characterized in that the vacuum cleaner comprises means for utilizing variations or changes in the vacuum level of the vacuum cleaner due to load variations during operation of the nozzle Select and change a variety of suction characteristics due to the variation of the electric drive fan motor current due to load fluctuations, i.e. the variation width, etc. parameter, and compare the variation width with a predetermined judgment limit value on each suction characteristic parameter. 24. The vacuum cleaner as claimed in claims 21 to 23, characterized in that, within a plurality of suction characteristic parameters, even during operation under each suction characteristic parameter, the vacuum cleaner comprises a device, by During the working period of the nozzle, according to the load variation, the working condition of the vacuum cleaner is judged, and another suction characteristic parameter is selected and changed according to the variation of the working condition. 25. A vacuum cleaner, equipped with a brushless DC motor whose rotation is controlled by a chopper control system converter device as an electric-driven fan motor, and the electric-driven fan motor device is inside the main body of the vacuum cleaner, and its characteristic is that the The brushless DC motor described has a chopper-controlled duty factor 100% operating region. 26. A vacuum cleaner, equipped with a brushless DC motor whose rotation is controlled by a chopper control system converter device as an electric-driven fan motor, and the electric-driven fan motor is installed in the main body of the vacuum cleaner, characterized in that the The BLDC motor has a chopper-controlled duty cycle of 100% of the operating area and avoids loads that cause the input power to exceed a predetermined value. 27. A vacuum cleaner with a brushless DC motor whose rotation is controlled by a chopper control system inverter, characterized in that the brushless DC motor has a working area with a chopper control duty factor of 100%. 28. A vacuum cleaner with a brushless DC motor whose rotation is controlled by a chopper control system converter device, characterized in that the brushless DC motor has a working area with a chopper duty factor of 100%, and can Avoid situations where loads cause the predetermined input power to be exceeded.

Images