CN104929966A - Device for preventing centrifugal fan from reversing and control method thereof - Google Patents
Device for preventing centrifugal fan from reversing and control method thereof Download PDFInfo
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- CN104929966A CN104929966A CN201510263411.4A CN201510263411A CN104929966A CN 104929966 A CN104929966 A CN 104929966A CN 201510263411 A CN201510263411 A CN 201510263411A CN 104929966 A CN104929966 A CN 104929966A
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- centrifugal blower
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- reversing
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000004083 survival effect Effects 0.000 claims description 4
- 230000002045 lasting effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 11
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005381 potential energy Methods 0.000 description 2
- 108010053481 Antifreeze Proteins Proteins 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
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Abstract
The invention relates to the technical field of household appliances, in particular to a device for preventing a centrifugal fan from reversing and a control method thereof. The device for preventing the centrifugal fan from reversing comprises an anemoscope arranged at an air outlet of the centrifugal fan, an alternating current contactor arranged at a power supply of the centrifugal fan, a phase meter used for detecting phase angles of two phases L1 and L2 of a three-phase power supply of the centrifugal fan, and a control unit connected with the anemoscope, the phase meter and the alternating current contactor. When the values of the wind speed Vm of the air outlet of the centrifugal fan measured by an anemometer in a set period Ts are all smaller than a set forward rotation minimum wind speed V1, a phase table is used for detecting the phase angle theta of two phases L1 and L2 of a three-phase power supply of the centrifugal fan, and when the phase angle theta is 240 degrees, a control unit starts an alternating current contactor to switch a suction point to enable the centrifugal fan to rotate forwards. The reverse rotation of the centrifugal fan is corrected automatically, the normal operation of the equipment is ensured, and the maintenance range is reduced.
Description
Technical field
The present invention relates to household electrical appliance technical field, particularly relate to a kind of prevent centrifugal blower from reversing device and controlling method.
Background technique
The working principle of centrifugal blower is the kinetic energy utilizing the impeller of high speed rotary to be air mechanical energy, is pressure energy more again, realizes the supercharging to air and acceleration through fan scroll the part kinetic energy of air.Be converted to the principle of potential energy according to kinetic energy, utilize the impeller of High Rotation Speed to be accelerated by gas, then slow down, change the flow direction, make kinetic energy convert potential energy (pressure) to.Centrifugal blower air stream axle is radially flowed by the rotation of impeller after entering impeller, and centrifugal blower is divided into dextrorotation and left-handed two profiles formula, faces from motor side, impeller turns clockwise, be called right rotation blower fan, impeller is rotated counterclockwise, and is called anticlockwise blower fan.Due to its structural feature, air quantity can be made obviously to reduce when centrifugal blower reverses.
Under refrigeration mode, if centrifugal blower reversion, compressor occurs that low-voltage variation, anti-freeze are protected after opening; Under heating mode, if centrifugal blower reversion, there will be leaving air temp too high, occur that temperature limiter is protected, the problems such as thermal cut-off disconnection.
Current control mode does not have to carry out blower fan reversion fault according to the size by monitoring air quantity and reminds and pass through electric switching and turn to the technological scheme of reversing to blower fan; therefore when centrifugal blower reverses; unit operation there will be abnormal protection after a period of time, affects the normal operation of unit.
Summary of the invention
The object of the invention is to propose a kind of device preventing centrifugal blower from reversing, by the structure of anemoscope, A.C. contactor and phase meter control unit, at the wind speed at the exhaust outlet place of centrifugal blower, and the wherein two-phase L1 of three phase mains, the phase angle of L2 parameter feedback abnormal time, operating point is switched when operation exception by A.C. contactor, automatically to correct centrifugal blower reversion, guarantee the normal operation of equipment, reduce scope and the difficulty of maintenance.
Additionally provide a kind of method preventing centrifugal blower from reversing, by detecting the size of the air quantity of centrifugal blower, when air quantity is too small, by the measurement of the wherein two-phase L1 of the three phase mains of centrifugal blower, the phase angle θ of L2, when judgement place centrifugal blower is inverted status, switches operating point and centrifugal blower is rotated forward; Prevent from, because the reversion of centrifugal blower, occurring low-voltage variation, anti-frost protection in cooling mode; Under heating mode, occur that temperature limiter is protected, the problem that thermal cut-off disconnects; Maintain the normal operation of blower fan, decrease frequency of maintenance.
For reaching this object, the present invention by the following technical solutions:
A kind of device preventing centrifugal blower from reversing, comprise be arranged on centrifugal blower exhaust outlet place for detecting the anemoscope of centrifugal blower in real time, be arranged on the power supply place of centrifugal blower for switch operating point A.C. contactor and for detect centrifugal blower the wherein two-phase L1 of three phase mains, the phase angle of L2 phase meter, and the control unit be connected with described anemoscope, phase meter and A.C. contactor.
As one of this technological selection scheme, described control unit is also connected with unit of warning, described in unit of warning comprise sound alarm module and display alarm module.
As one of this technological selection scheme, described display alarm module is LED display.
A kind of controlling method preventing centrifugal blower from reversing, when the numerical value that the wind speed Vm that anemoscope records the exhaust outlet of centrifugal blower records in setting cycle Ts is all less than the minimum wind speed V1 of the rotating forward of setting, by the feedback signal of control unit according to anemoscope, the wherein two-phase L1 of three phase mains, the phase angle θ of L2 of centrifugal blower is detected by phase meter, when θ=240 °, phase angle, then control unit judges that centrifugal blower is after inverted status, starts A.C. contactor and to switch operating point, centrifugal blower is rotated forward.
As one of this technological selection scheme, after being completed by A.C. contactor switching operating point, the phase angle θ of the three phase mains again detecting centrifugal blower by phase meter wherein two-phase L1, L2, when θ=120 °, phase angle, feeds back centrifugal blower normal operation signal by control unit; When θ=240 °, phase angle, send A.C. contactor trouble signal by control unit.
As one of this technological selection scheme, the rotating forward setting survival wind speed of described centrifugal blower is V2, and V2 > V1, as the wind speed Vm > V2 of the exhaust outlet of centrifugal blower, control unit back-to-back running normal signal.
As one of this technological selection scheme, as the wind speed V1 < Vm < V2 of the exhaust outlet of centrifugal blower, after sending by control unit the signal that centrifugal blower normally runs, monitoring Vm numerical value comparison real-time with V1, V2 numerical value in real time.
As one of this technological selection scheme, control unit is after judging that centrifugal blower is inverted status, and time delay t1, starts A.C. contactor to switch operating point.
As one of this technological selection scheme, in lasting set time section Tm, the numerical value Vm of the wind speed of the exhaust outlet of measured centrifugal blower is all less than V1, then control unit judges the concurrent signal that is out of order of centrifugal blower operation troubles.
As one of this technological selection scheme, when detected by phase meter the wherein two-phase L1 of three phase mains of centrifugal blower, L2 θ=120 °, phase angle time, send air quantity warning less than normal by control unit.
The invention has the beneficial effects as follows: by the structure of anemoscope, A.C. contactor and phase meter control unit, at the wind speed at the exhaust outlet place of centrifugal blower, and the wherein two-phase L1 of three phase mains, the phase angle of L2 parameter feedback abnormal time, operating point is switched when operation exception by A.C. contactor, automatically to correct centrifugal blower reversion, guarantee the normal operation of equipment, reduce scope and the difficulty of maintenance; When the numerical value recorded in setting cycle Ts by the wind speed comparing the exhaust outlet of centrifugal blower and the minimum wind speed of the rotating forward of setting, when wind speed is lower than setting value, by the measurement of the wherein two-phase L1 of the three phase mains of centrifugal blower, the phase angle θ of L2, to determine centrifugal blower whether in inverted status, and switch operating point further for inverted status centrifugal blower is rotated forward; Prevent from, because the reversion of centrifugal blower, occurring low-voltage variation, anti-frost protection in cooling mode; Under heating mode, occur that temperature limiter is protected, the problem that thermal cut-off disconnects; Maintain the normal operation of blower fan, decrease frequency of maintenance.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device preventing centrifugal blower from reversing that the specific embodiment of the invention provides;
Fig. 2 is the flow chart of the controlling method preventing centrifugal blower from reversing that the specific embodiment of the invention provides.
In figure:
1, anemoscope; 2, A.C. contactor; 3, phase meter; 4, control unit; 5, to warn unit; 6, audible alarm unit; 7, display alarm unit.
Embodiment
Technological scheme of the present invention is further illustrated by embodiment below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of device preventing centrifugal blower from reversing, it comprise be arranged on centrifugal blower exhaust outlet place for detecting the anemoscope 1 of centrifugal blower in real time, be arranged on the power supply place of centrifugal blower for switch operating point A.C. contactor 2 and for detect centrifugal blower the wherein two-phase L1 of three phase mains, the phase angle of L2 phase meter 3, and the control unit 4 be connected with described anemoscope 1, phase meter 3 and A.C. contactor 2.
The wind speed Vm of the exhaust outlet of the centrifugal blower tested is sent to control unit 4 by described anemoscope 1 in real time, by control unit 4 according to the comparison to Vm data, when Vm data fall into the scope of setting, the wherein two-phase L1 of the three phase mains of the centrifugal blower further measured by phase meter 3, the phase angle θ of L2, judge whether centrifugal blower is in inverted status, if centrifugal blower is in inverted status, then instruction A.C. contactor 2 switches operating point to revise the turning to as forward of centrifugal blower.
As one of this technological selection scheme, described control unit 4 is also connected with unit 5 of warning, described in unit 5 of warning comprise sound alarm module 6 and display alarm module 7.Described sound alarm module 6, after the trouble signal receiving control unit 4, sends alert audio; Described display alarm module 7 can connect the control panel of whole machine, on the control panel display alarm word or graphical information, with the concrete fault message of the prompting coordinating alarm module 6 more to determine; Described display alarm module 7 also can be independently display screen, so that manipulation personnel pay close attention in real time.
As one of this technological selection scheme, described display alarm module 7 is LED display.Described LED display is arranged on operator or user comparatively significantly region, so that the prompting of fault message or operation information is more obvious.
Present invention also offers a kind of controlling method preventing centrifugal blower from reversing, as shown in Figure 2, when the numerical value that the wind speed Vm that anemoscope 1 records the exhaust outlet of centrifugal blower records in setting cycle Ts is all less than the minimum wind speed V1 of the rotating forward of setting, by the feedback signal of control unit 4 according to anemoscope 1, the wherein two-phase L1 of the three phase mains of centrifugal blower, the phase angle θ of L2 is detected by phase meter 3, when θ=240 °, phase angle, then control unit 4 judges that centrifugal blower is after inverted status, starts A.C. contactor 2 and to switch operating point, centrifugal blower is rotated forward.
The numerical value of the minimum wind speed V1 of described rotating forward is constant, can set according to the centrifugal blower of different capacity and suitable environment, the numerical value of described setting cycle Ts is constant, can set according to the carrying out practically situation of centrifugal blower, air quantity frequency running requirements in conjunction with machine itself.
As one of this technological selection scheme, switch after operating point completes by A.C. contactor 2, the wherein two-phase L1 of the three phase mains of centrifugal blower, the phase angle θ of L2 is again detected by phase meter 3, when θ=120 °, phase angle, described centrifugal blower is modified to rotating forward by reversion, then feed back centrifugal blower normal operation signal by control unit 4.
When θ=240 °, phase angle, described centrifugal blower is still in inverted status, A.C. contactor 2 does not complete the action switching operating point, then send A.C. contactor 2 trouble signal by control unit 4, then there are operator after unit 5 place of warning receives A.C. contactor 2 fault message, as early as possible A.C. contactor 2 keeped in repair.
As one of this technological selection scheme, the parameter of exhaust outlet wind speed during rotating forward about described centrifugal blower, the survival wind speed also comprising setting is V2, and V2 > V1, described survival wind speed is V2 is constant, can set according to the running state of concrete centrifugal blower and power, therefore described as the wind speed Vm > V2 of the exhaust outlet of centrifugal blower within the fixed cycle that centrifugal blower runs, control unit 4 back-to-back running normal signal.
As one of this technological selection scheme, as the wind speed V1 < Vm < V2 of the exhaust outlet of centrifugal blower, because although the numerical value of Vm is greater than V1, but compared to V2, still be in the region that a Security is lower, therefore, in order to the normal operation of centrifugal blower, after sending by control unit 4 signal that centrifugal blower normally runs, still need to monitor Vm numerical value in real time and comparison real-time with V1, V2 numerical value.
As one of this technological selection scheme, when the numerical value that the wind speed Vm that anemoscope 1 records the exhaust outlet of centrifugal blower records in setting cycle Ts is all less than the minimum wind speed V1 of the rotating forward of setting, by the feedback signal of control unit 4 according to anemoscope 1, the wherein two-phase L1 of the three phase mains of centrifugal blower, the phase angle θ of L2 is detected by phase meter 3, when θ=240 °, phase angle, then control unit 4 judges that centrifugal blower is after inverted status, time delay t1, starts A.C. contactor 2 and to switch operating point, centrifugal blower is rotated forward.The numerical value of described t1 is constant, and it can set according to the carrying out practically parameter of centrifugal blower and cycle.
As one of this technological selection scheme; in lasting set time section Tm; the numerical value Vm of the wind speed of the exhaust outlet of measured centrifugal blower is all less than V1; in order to prevent machine when running refrigerating pattern; occur the problem such as low-voltage variation, anti-frost protection or machine rerun heating mode time; there is temperature limiter protection; the problems such as thermal cut-off disconnection; then control unit 4 judges the concurrent signal that is out of order of centrifugal blower operation troubles; after receiving fault message, shutdown maintenance is carried out, to check with or without the abnormal conditions such as leaking out by operator or maintenance man.Concrete, the time period Tm of described setting is constant, specifically sets according to the operational situation of centrifugal extension set and cycle.
As one of this technological selection scheme, when the numerical value of wind speed Vm in setting cycle Ts that anemoscope 1 records the exhaust outlet of centrifugal blower is all less than the minimum wind speed V1 of the rotating forward of setting, by the feedback signal of control unit 4 according to anemoscope 1, the wherein two-phase L1 of the three phase mains of centrifugal blower, the phase angle θ of L2 is detected by phase meter 3, when detected by phase meter 3 the wherein two-phase L1 of three phase mains of centrifugal blower, L2 θ=120 °, phase angle time, send air quantity warning less than normal by control unit 4.Then operator or maintenance man are after receiving air quantity information warning less than normal, maintenance down, to check with or without the abnormal conditions such as leaking out.
In sum, by the structure of anemoscope, A.C. contactor and phase meter control unit, at the wind speed at the exhaust outlet place of centrifugal blower, and the wherein two-phase L1 of three phase mains, the phase angle of L2 parameter feedback abnormal time, operating point is switched when operation exception by A.C. contactor, automatically to correct centrifugal blower reversion, guarantee the normal operation of equipment, reduce scope and the difficulty of maintenance; When the numerical value recorded in setting cycle Ts by the wind speed comparing the exhaust outlet of centrifugal blower and the minimum wind speed of the rotating forward of setting, when wind speed is lower than setting value, by the measurement of the wherein two-phase L1 of the three phase mains of centrifugal blower, the phase angle θ of L2, to determine centrifugal blower whether in inverted status, and switch operating point further for inverted status centrifugal blower is rotated forward; Prevent from, because the reversion of centrifugal blower, occurring low-voltage variation, anti-frost protection in cooling mode; Under heating mode, occur that temperature limiter is protected, the problem that thermal cut-off disconnects; Maintain the normal operation of blower fan, decrease frequency of maintenance.
Below know-why of the present invention is described in conjunction with specific embodiments.These describe just in order to explain principle of the present invention, and can not be interpreted as limiting the scope of the invention by any way.Based on explanation herein, those skilled in the art does not need to pay performing creative labour can associate other embodiment of the present invention, and these modes all will fall within protection scope of the present invention.
Claims (10)
1. the device preventing centrifugal blower from reversing, it is characterized in that, comprise be arranged on centrifugal blower exhaust outlet place for detecting the anemoscope (1) of centrifugal blower in real time, be arranged on the power supply place of centrifugal blower for switch operating point A.C. contactor (2) and for detect centrifugal blower the wherein two-phase L1 of three phase mains, the phase angle of L2 phase meter (3), and the control unit (4) be connected with described anemoscope (1), phase meter (3) and A.C. contactor (2).
2. the device preventing centrifugal blower from reversing according to claim 1, it is characterized in that, described control unit (4) is also connected with unit of warning (5), described in unit (5) of warning comprise sound alarm module (6) and display alarm module (7).
3. the device preventing centrifugal blower from reversing according to claim 2, is characterized in that, described display alarm module (7) is LED display.
4. the controlling method preventing centrifugal blower from reversing, it is characterized in that, when the numerical value that the wind speed Vm that anemoscope (1) records the exhaust outlet of centrifugal blower records in setting cycle Ts is all less than the minimum wind speed V1 of the rotating forward of setting, by control unit (4) according to the feedback signal of anemoscope (1), the wherein two-phase L1 of the three phase mains of centrifugal blower is detected by phase meter (3), the phase angle θ of L2, when θ=240 °, phase angle, then control unit (4) judges that centrifugal blower is after inverted status, starting A.C. contactor (2) makes centrifugal blower rotate forward to switch operating point.
5. the controlling method preventing centrifugal blower from reversing according to claim 4, it is characterized in that, after being completed by A.C. contactor (2) switching operating point, the wherein two-phase L1 of the three phase mains of centrifugal blower, the phase angle θ of L2 is again detected by phase meter (3), when θ=120 °, phase angle, feed back centrifugal blower normal operation signal by control unit (4); When θ=240 °, phase angle, send A.C. contactor (2) trouble signal by control unit (4).
6. the controlling method preventing centrifugal blower from reversing according to claim 4, it is characterized in that, the rotating forward setting survival wind speed of described centrifugal blower is V2, and V2 > V1, as the wind speed Vm > V2 of the exhaust outlet of centrifugal blower, control unit (4) back-to-back running normal signal.
7. the controlling method preventing centrifugal blower from reversing according to claim 6, it is characterized in that, as the wind speed V1 < Vm < V2 of the exhaust outlet of centrifugal blower, after sending by control unit (4) signal that centrifugal blower normally runs, monitoring Vm numerical value comparison real-time with V1, V2 numerical value in real time.
8. the controlling method preventing centrifugal blower from reversing according to claim 4, is characterized in that, control unit (4) is after judging that centrifugal blower is inverted status, and time delay t1, starts A.C. contactor (2) to switch operating point.
9. the controlling method preventing centrifugal blower from reversing according to claim 4, it is characterized in that, in lasting set time section Tm, the numerical value Vm of the wind speed of the exhaust outlet of measured centrifugal blower is all less than V1, then control unit (4) judges the concurrent signal that is out of order of centrifugal blower operation troubles.
10. the controlling method preventing centrifugal blower from reversing according to claim 4, it is characterized in that, when detected by phase meter (3) the wherein two-phase L1 of three phase mains of centrifugal blower, L2 θ=120 °, phase angle time, send air quantity warning less than normal by control unit (4).
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| CN201510263411.4A CN104929966B (en) | 2015-05-21 | 2015-05-21 | Device for preventing centrifugal fan from reversing and control method thereof |
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| CN201510263411.4A CN104929966B (en) | 2015-05-21 | 2015-05-21 | Device for preventing centrifugal fan from reversing and control method thereof |
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| CN104929966A true CN104929966A (en) | 2015-09-23 |
| CN104929966B CN104929966B (en) | 2017-09-15 |
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Cited By (3)
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| CN108561324A (en) * | 2018-03-01 | 2018-09-21 | 长沙格力暖通制冷设备有限公司 | Fan testing device, air conditioner and fan testing method of air conditioner |
| CN110285545A (en) * | 2019-07-10 | 2019-09-27 | 珠海格力电器股份有限公司 | Method and device for determining rotation direction of fan |
| CN110566488A (en) * | 2019-08-12 | 2019-12-13 | 珠海格力电器股份有限公司 | Method and device for reducing air output reduction of fan |
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| CN110566488A (en) * | 2019-08-12 | 2019-12-13 | 珠海格力电器股份有限公司 | Method and device for reducing air output reduction of fan |
| CN110566488B (en) * | 2019-08-12 | 2020-08-21 | 珠海格力电器股份有限公司 | Method and device for reducing air output reduction of fan |
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| CN104929966B (en) | 2017-09-15 |
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