CN100507278C - Electric blower - Google Patents
Electric blower Download PDFInfo
- Publication number
- CN100507278C CN100507278C CN 200510117629 CN200510117629A CN100507278C CN 100507278 C CN100507278 C CN 100507278C CN 200510117629 CN200510117629 CN 200510117629 CN 200510117629 A CN200510117629 A CN 200510117629A CN 100507278 C CN100507278 C CN 100507278C
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- revolution
- load
- fan
- gas fan
- air quantity
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- Y02B30/746—
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- Control Of Motors That Do Not Use Commutators (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The present invention provides an electric blower that performs: measuring an amount of airflow against a fan rotation speed of the blower with a load magnitude detected previously; determining an empirical formula to calculate a fan rotation speed to discharge an amount of target airflow in response to the magnitude of a load of the blower according to the data obtained from the above measurement repeated a plurality of times varying the magnitude of the load on the blower; operating, firstly in practice, the blower to detect the magnitude of the load of the blower, then to calculate the fan rotation speed to discharge the amount of target airflow using the empirical formula; and then changing the blower operation to the fan rotation speed given by the calculation.
Description
Technical field
The present invention relates to be used in aircondition that output tube is connected in, the electric blower of supplying with necessary air such as cool cycles corresponding to the state of the output tube that is connected.
Background technique
Present stage, as this electric blower, carry out so-called feedback control, promptly, monitor that the fan revolution is calculated air quantity with PWM (the pulse duration modulation pulse widthmodulation) signal that gives motor at ordinary times, the air quantity and the target air quantity of calculating are compared, under the situation that has difference between the two, revise control signal motor.For the content of this technology, for example open in flat 7-No. 301450 communiques and disclose to some extent in (to call patent documentation 1 in the following text) (Japan Patent) spy.
Fig. 3 is the flow chart of the electric blower of the prior art described in the patent documentation 1.In Fig. 3, CFM
TBe target gas speed, CFM
ABe actual air speed, rpm is the currency of electromotor velocity signal, and A and B are the constant of expression gas fan characteristic, and E, F and G are for the expression motor characteristic and be used for controlling in response to control signal the constant of characteristic of the unit of electromotor velocity.As shown in Figure 3, the control of the electric blower of prior art may further comprise the steps, that is: the step 135 of recognition objective air quantity, use sends to the pwm signal and the fan revolution of existing motor and calculates the step 140 of air quantity, to the target air quantity with calculate the step 145,150 that air quantity compares, change the step 155,165 of PWM value according to its comparative result, and the PWM value that changes sent to step 160 in the control device of electric motor, wherein, the action from step 135 to step 160 is carried out in circulation constantly.
But, because will inevitably be accompanied by fluctuation by the flowing of air that electric blower sent, so in the electric blower of prior art, can not make the target air quantity and calculate that air quantity is consistent to be moved sustainedly and stably, but under the situation of the revolution change of being everlasting, move.And, owing in feedback control system, include as bigger key elements of this inertia such as motor and fans, so might move excessive situation, fluctuation increase, the phenomenon that turns round under the unstable state that the revolution amplitude fluctuates more greatly and up and down also may take place in some cases.
Summary of the invention
The present invention proposes in order to address the above problem, and its purpose is to provide a kind of state that can corresponding output tube to guarantee the target air quantity, the electric blower that can carry out stable operation simultaneously.
In order to address the above problem, motor gas fan of the present invention comprises: motor, the gas fan with the fan that is driven by described motor rotation and the control gear of the described motor of controlling and driving.And described control gear comprises: the load detection unit, detect and export the size of the load of described gas fan; The revolution calculating part according to from the size of the load of the described gas fan of described load detection unit output and the target air quantity that gives, is calculated described gas fan necessary revolution when discharging the target air quantity; The revolution switching part is according to the output from described revolution calculating part, with fan revolution necessary fan revolution when the load that is predetermined detects revolution and switches to described gas fan and discharge the target air quantity; With moment determination section, indicate described load detection unit, the moment of described revolution calculating part and the action of described revolution switching part, described load detection unit is determined at the motor input current under the described load detection revolution, export the value of the size of the load of representing described gas fan according to described motor input current, described revolution calculating part, the formula of the fan revolution of discharging the target air quantity is calculated in utilization according to the size of gas fan load, value and target airflow value based on the size of loading from the expression gas fan of load detection unit output calculate the needed fan revolution of discharge target airflow value, described formula is based in advance under the state of the size of holding the gas fan load, remain in size and to measure the air quantity of gas fan in certain, in the size that changes the gas fan load, carry out repeatedly the resulting laboratory data of this mensuration repeatedly and obtain with respect to the fan revolution with gas fan load.
According to such structure, because can be before operation begins or under the situation that the state of loading changes, detect the situation of output tube in advance by the action of control moment determination section, situation corresponding to the output tube that detects, move with the fan revolution of discharging the target air quantity, so can not produce the amplification of revolution fluctuation, carry out stable air quantity control operation.
Description of drawings
Fig. 1 is the block diagram of the electric blower in the first embodiment of the invention.
Fig. 2 is the air quantity of electric blower of expression first embodiment of the invention and the figure of revolution relation.
Fig. 3 is the control flow chart of prior art electric blower.
Embodiment
First mode of execution
Usually, in containing the output tube of fan, if determined the state of output tube, then the revolution of air quantity and fan is proportional, and the slope variations such as (gradient) of this relation takes place according to the situation of output tube.And, if can detect the state of output tube, then can determine the relation of air quantity and revolution with certain form.Here, the load that the situation of output tube can be used as gas fan detects, and the output that the load of gas fan can be used as motor detects.And, because the output of motor is proportional with the product of the revolution of fan and torque, so, if revolution is certain, then can detect the state of output tube by the torque of motor.In addition, under the situation of direct current motor, because the proportional relation of torque and input current, so can detect motor torque by the input current of measuring motor.Thereby, just can detect the state of output tube by the input current of measuring motor.
The value (hereinafter referred to as " gas fan load variation ") of size that the present invention is based on the load of the gas fan that the motor input current of expression when rotating with the regulation revolution obtain detects the situation of output tube.Wherein, the regulation revolution is predetermined, and must move gas fan with this revolution when measuring the gas fan load variation.
That is to say that by the regulation revolution service meter that is predetermined, the load of measuring the motor input current detects operation, by like this, the output tube situation detects as the gas fan load variation.And, based in advance from the characteristic of gas fan and the empirical formula of making calculates the fan revolution that is used to discharge the target air quantity according to the situation of output tube.Then, should realize not carrying out frequent feedback control and stable air quantity control operation with the motor of this revolution rotary fan by controlling and driving.
Below, with reference to accompanying drawing embodiments of the present invention are described.Wherein, the present invention is not limited to this mode of execution.
Fig. 1 is the block diagram of the electric blower 1 in the first embodiment of the invention.
In Fig. 1, electric blower 1 of the present invention comprises motor 25, gas fan 20 and control gear 10.
The control signal Fo that variable motor control part 30 responses are produced by air quantity control device 35 controls the revolution of motor.In addition, detect the revolution of motor and motor revolution signal Rm is supplied to air quantity control device 35.
Air quantity control device 35 comprises determination section 100, load detection unit 105, revolution calculating part 110, revolution switching part 120 and control signal supply unit 90 constantly.
The signal that load detection unit 105 is accepted from moment determination section 100, output load detects rotation signal Tra, makes motor 25 detect the revolution rotation with load.And, measure motor input current Im at this moment, and export gas fan load variation Tra based on it.
Control signal supply unit 90 is supplied with revolution control signal Fo to variable velocity motor control part 30, makes from the Fs of revolution switching part 120 consistent with the motor revolution signal Rm from variable motor control part 30.
Here, formula a is according to following order decision.
Motor input current when (1) detecting revolution operation gas fan by mensuration with the load that is predetermined detects the load condition of gas fan, obtains the gas fan load variation.
(2) be under certain state keeping the gas fan load variation, change the fan revolution, and, the air quantity of gas fan measured with respect to each fan revolution.
(3) obtain by the air quantity of the resulting gas fan of above-mentioned experiment and the relation between the fan revolution, as formula a by method of least squares.
Also can directly use the value of motor input current as the gas fan load variation, also can use value as the motor input current for the ratio of quota electric current from the determination of motor input current institute.
Wherein, output tube system 15 is used for conduit that air distribution is used in the regulation field that should regulate.Output tube system 15 for example can be arranged in the building, supplies with the air of circulation to desirable room.Static air pressure in the output tube system 15 is influenced by the shape of output tube and length, damper (damper) 45, filter 50 and thermal converter 55.
Below, the action and the effect of the electric blower 1 of said structure is illustrated.
At first, when from the 100 transmission indications of the moment determination section, make gas fan 20 rotations with the speed rotation of stipulating by motor 25.Behind the spin stabilization of gas fan 20, revolution calculating part 110 is measured from the gas fan load variation Tra of load detection unit 105 outputs.At this moment, gas fan load variation Tra reflection is by static air pressure, the shape of output tube and the situation of the output tube that length, filter 50 and thermal converter 55 are determined in the output tube system 15.
Fig. 2 is the characteristic pattern that expression is consistent with aforementioned calculation formula a and concerns between the air quantity of the gas fan under the situation and the fan revolution.As shown in Figure 2, there is proportionate relationship between the air quantity of gas fan and the fan revolution.And the slope of these straight lines is along with the value (Tra1～Tra4) change of gas fan load variation Tra.
For example, suppose that it is 600r/min that load detects revolution, if use gas fan load variation Tra and air quantity Q to represent revolution Fr, then formula a can be expressed from the next.
Fr＝—642.75+6.0837Tra+19598.1/Tra+(—121.96+1.819Tra+4134.1/Tra)Q
Wherein, Fr is revolution (r/min), and Tra is the air-supply load variation, and Q is air quantity (m
3/ min).
The gas fan load variation Tra that measured of storage, the target air volume signal Q substitution that will be sent by system controller 40 is by the represented formula a of following formula, the operation revolution Fr in the time of can calculating the target air quantity.And, by sending to variable-speed motor control device 30, just can make the target air quantity pass through output tube with the corresponding control signal Fo of this revolution.
According to such structure, because can be after the situation that detects output tube in advance, move gas fan 20 with revolution corresponding to the target air quantity that matches with this situation, so air quantity can be adjusted into and the corresponding target air quantity of the situation of the output tube that is connected, and can carry out stable operation.
Wherein, as long as load detection unit 105, revolution calculating part 110, revolution switching part 120 move in turn, the situation of starting in the output of accepting leading portion respectively and in turn, and inferior by the situation of other control gear institute sequential firings such as determination section constantly, can both reach purpose of the present invention.
In addition, action when determination section 100 also can begin in the operation of electric blower 1 constantly, the situation of output tube in the time of can not using other method detection aircondition 1 to be provided with thus, and when the operation beginning, detect automatically.For example, when run switch is connected, begin load and detect operation, before compressor (not shown) operation, measure gas fan load variation Tra in advance, detect the situation of output tube.
And, can also in moment determination section 100, detect the situation of output tube termly.For example, 12 detection operations that begin to load every day, measure gas fan load variation Tra, store to second day 12, thus can be also corresponding in the filter 50 in the output tube system 15 for the changed condition under the opposing increase situation of the flow of the wind that flows through.
And, also can be that constantly determination section 100 moves when the change of state of air flowing in output tube system 15, the action of the detection unit 105 of loading begins.Make thus under the situation that connects output tube branch and installation damper, also can detect the switching situation of damper.
More than, electric blower of the present invention is owing to can guarantee the target air quantity according to the situation of output tube, so can be applicable to the air conditioner etc. of output tubular type.
Claims (6)
1. an electric blower is characterized in that, comprising:
Motor;
Gas fan has the fan that is driven by described motor rotation; With
Control gear, the described motor of controlling and driving, wherein,
Described control gear comprises:
The load detection unit detects and exports the size of the load of described gas fan;
The revolution calculating part, according to from the size of the load of the described gas fan of described load detection unit output and the target air quantity that gives, necessary fan revolution when calculating and exporting described gas fan and discharging the target air quantity;
The revolution switching part according to the output from described revolution calculating part, detects revolution with the fan revolution from the load that is predetermined and switches to the necessary fan revolution of described gas fan discharge target air quantity; With
Determination section is indicated the moment that makes described load detection unit, described revolution calculating part and the action of described revolution switching part constantly,
Described load detection unit is determined at described load and detects revolution motor input current down, exports the value of the size of the load of representing described gas fan according to described motor input current,
Described revolution calculating part, the formula of the fan revolution of discharging the target air quantity is calculated in utilization according to the size of gas fan load, value and target airflow value based on the size of loading from the expression gas fan of load detection unit output calculate the needed fan revolution of discharge target airflow value
Described formula is based in advance remaining under the state of the size of holding the gas fan load, in the size with the gas fan load and measures the air quantity of gas fan with respect to the fan revolution in certain, carries out repeatedly the resulting laboratory data of this mensuration repeatedly and obtain in the size that changes the gas fan load.
2. electric blower according to claim 1 is characterized in that:
Described revolution calculating part basis and the value of the payload of the irrelevant a plurality of values that determine of the load of described gas fan, the described gas fan of expression and the target airflow value that gives calculate described gas fan and discharge the necessary fan revolution of target air quantity.
3. electric blower according to claim 1 is characterized in that:
Described motor is a direct current motor.
4. electric blower according to claim 1 is characterized in that:
Work when described moment determination section begins in described electric blower operation.
5. electric blower according to claim 1 is characterized in that:
Described moment determination section is in each certain hour action.
6. electric blower according to claim 1 is characterized in that:
Move when bigger changes takes place for the size of the load of described moment determination section in described gas fan.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004323376 | 2004-11-08 | ||
| JP2004323376 | 2004-11-08 | ||
| JP2005243864 | 2005-08-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1773124A CN1773124A (en) | 2006-05-17 |
| CN100507278C true CN100507278C (en) | 2009-07-01 |
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ID=36760227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510117629 Expired - Fee Related CN100507278C (en) | 2004-11-08 | 2005-11-07 | Electric blower |
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| Country | Link |
|---|---|
| CN (1) | CN100507278C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2660527B1 (en) * | 2012-05-03 | 2015-07-22 | ABB Technology Oy | Method for tuning a ventilation system |
| JP6653909B1 (en) * | 2019-07-03 | 2020-02-26 | 株式会社松浦機械製作所 | Manufacturing method of three-dimensional objects |
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2005
- 2005-11-07 CN CN 200510117629 patent/CN100507278C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1773124A (en) | 2006-05-17 |
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