CN108332651A - A kind of the impeller detecting system and method for kitchen ventilator - Google Patents
A kind of the impeller detecting system and method for kitchen ventilator Download PDFInfo
- Publication number
- CN108332651A CN108332651A CN201810365659.5A CN201810365659A CN108332651A CN 108332651 A CN108332651 A CN 108332651A CN 201810365659 A CN201810365659 A CN 201810365659A CN 108332651 A CN108332651 A CN 108332651A
- Authority
- CN
- China
- Prior art keywords
- impeller
- pulse signal
- air duct
- magnetic
- magnetic field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
- G01B7/31—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
- G01B7/312—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes for measuring eccentricity, i.e. lateral shift between two parallel axes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/16—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in the magnetic properties of material resulting from the application of stress
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
- Measuring Volume Flow (AREA)
Abstract
The embodiment of the invention discloses the impeller detecting system and method for a kind of kitchen ventilator, which includes：Motor, spiral case and air duct, spiral case are connected to air duct；Impeller is provided in spiral case, motor is rotated for impeller；Impeller detecting system includes：The magnetic element that is set on impeller, the magnetic field detection module being set on spiral case and smoke machine main control unit；Magnetic field detection module, the magnetic field generated for detecting magnetic element during wheel rotation, and corresponding pulse signal is formed according to the magnetic field signal detected；Smoke machine main control unit for changing whether detection impeller eccentric anomaly occurs according to the amplitude of pulse signal, and changes detection air duct according to the frequency of pulse signal and whether there is load abnormal.Magnetic field detection module is arranged on spiral case, can quickly and efficiently detect impeller eccentric anomaly and air duct load abnormal, realize the real time monitoring to impeller runnability and air duct performance by installing magnetic element on impeller for the example scheme.
Description
Technical field
The present embodiments relate to cooking apparatus control technology, the impeller detecting system and method for espespecially a kind of kitchen ventilator.
Background technology
The core component of kitchen ventilator includes motor, spiral case and impeller, and kitchen ventilator impeller may be due to the greasy dirt on impeller not
Cleaning in time or deformation cause bias, and when high speed operation of motor, impeller bias can make motor shaft eccentric motion, sealing and
Increased friction makes motor be easy aged deterioration；And impeller, when quickly running, dynamic balance of impeller difference can also make noise increase, snail
Flow-disturbing is chaotic inside shell, influences air quantity and wind pressure property.
In addition, to the detection of duct pressure mainly by being sampled to motor current value in current industry, motor load
Relationship model is formed between variation and duct pressure variation, for judging that the working condition of smoke machine changes.But this sampling side
Formula is easy to be influenced by motor, volute structure difference, and cumbersome to the adjusting of sample rate current threshold value and not smart in production process
Standard is easy because the above reason causes the failure of detection.
Invention content
In order to solve the above-mentioned technical problem, an embodiment of the present invention provides a kind of impeller detecting system of kitchen ventilator and sides
Method can quickly and efficiently detect impeller eccentric anomaly and air duct load abnormal, realize to impeller runnability and air duct performance
Real time monitoring.
In order to solve the above technical problems, the embodiment of the present invention adopts the following technical scheme that：
A kind of impeller detecting system of kitchen ventilator, the kitchen ventilator include：Motor, spiral case and air duct, spiral case are connected to air duct；Spiral case
It is inside provided with impeller, motor is rotated for impeller；Impeller detecting system includes：The magnetic element that is set on impeller is set
The magnetic field detection module and smoke machine main control unit being placed on spiral case；
Magnetic field detection module, the magnetic field generated for detecting magnetic element during wheel rotation, and according to the magnetic detected
Field signal forms corresponding pulse signal；
Smoke machine main control unit, for changing whether detection impeller eccentric anomaly occurs according to the amplitude of pulse signal, and according to
The frequency variation detection air duct of pulse signal whether there is load abnormal.
Optionally, smoke machine main control unit changes whether detection impeller eccentric anomaly packet occurs according to the amplitude of pulse signal
It includes：
The amplitude variable quantity of pulse signal is compared with preset amplitude variable quantity threshold value；
When the amplitude variable quantity of pulse signal is greater than or equal to amplitude variable quantity threshold value, there are eccentric anomalies for judgement impeller；When
When the amplitude variable quantity of pulse signal is less than amplitude variable quantity threshold value, judgement impeller is normal.
Optionally, magnetic element includes one or more；
When magnetic element includes multiple, smoke machine main control unit is additionally operable to obtain the amplitude variation of pulse signal by following proposal
Amount：
Calculate the average value of the amplitude of the pulse signal corresponding with multiple magnetic elements detected in preset detection cycle；
Calculate separately maximum value in the amplitude of the corresponding pulse signal of multiple magnetic elements and minimum value and the average value
The absolute value of difference；
Using the higher value in calculated two absolute values as the amplitude variable quantity of pulse signal.
Optionally, smoke machine main control unit changes detection air duct according to the frequency of pulse signal and whether there is load abnormal packet
It includes：
The rotation speed change amount of impeller is calculated according to the frequency variation of pulse signal；
The rotation speed change amount of impeller is compared with preset rotation speed change amount threshold value；
When the rotation speed change amount of impeller is greater than or equal to rotation speed change amount threshold value, there are load abnormals in judgement air duct；Work as impeller
Rotation speed change amount when being less than rotation speed change amount threshold value, the load of judgement air duct is normal.
Optionally, magnetic element includes one or more；
When magnetic element includes multiple, the rotating speed that smoke machine main control unit calculates impeller according to the frequency variation of pulse signal becomes
Change amount includes：
Acquire the frequency values of the corresponding pulse signal of multiple magnetic elements respectively in multiple rotation periods of impeller；
The corresponding pulse period is calculated according to the frequency values of pulse signal；
According to rotating speed calculation formula and the pulse period, collected multiple magnetism in multiple rotation periods are calculated separately out
The tachometer value of the corresponding impeller of frequency values of the pulse signal of element；
Calculate the average value of multiple tachometer values；
Calculate the absolute value of average value and the difference of preset motor speed, the rotation speed change amount as impeller.
Optionally, smoke machine main control unit is additionally operable to：In judgement air duct there are when load abnormal, the rotating speed of motor is improved, with
Changed come the load of compensation wind channel by improving air quantity；And current rotating speed is kept when compensating effective, it is carried out when compensating invalid
Alarm.
Optionally, magnetic element includes the magnetic fin on newly-increased magnetic pole and/or impeller.
Optionally, spiral case includes the first side and second side for being located at impeller both sides, is provided in first side
Air-ducting ring is provided with electric machine support in second side；Magnetic field detection module includes hall sensing unit and signal processing unit；
Hall sensing unit is used to detect the magnetic field of magnetic element generation, and signal processing unit is used to form arteries and veins according to magnetic field signal
Rush signal；
Hall sensing unit is set in air-ducting ring and/or is set on electric machine support.
Optionally, the installation position of hall sensing unit meets：It is magnetic when magnetic element passes through hall sensing unit
Induction spacing between element and hall sensing unit meets：3-7 millimeters.
A kind of impeller detection method of kitchen ventilator, the kitchen ventilator include：Motor, spiral case and air duct, spiral case are connected to air duct；
Impeller is provided in spiral case, motor is rotated for impeller；Magnetic element is provided on impeller, this method includes：
The magnetic field that magnetic element generates is detected by preset magnetic field detection module during wheel rotation, and according to detecting
Magnetic field signal form corresponding pulse signal；
Change whether detection impeller eccentric anomaly occurs according to the amplitude of pulse signal, and is changed according to the frequency of pulse signal
It detects air duct and whether there is load abnormal.
The advantageous effect of the embodiment of the present invention includes：
1, the kitchen ventilator in the embodiment of the present invention includes：Motor, spiral case and air duct, spiral case are connected to air duct；It is provided in spiral case
Impeller, motor are rotated for impeller；Impeller detecting system includes：The magnetic element that is set on impeller is set to spiral case
On magnetic field detection module and smoke machine main control unit；Magnetic field detection module, for detecting magnetic member during wheel rotation
The magnetic field that part generates, and corresponding pulse signal is formed according to the magnetic field signal detected；Smoke machine main control unit, for according to arteries and veins
Whether the amplitude variation detection impeller for rushing signal there is eccentric anomaly, and is according to the frequency of pulse signal variation detection air duct
It is no that there are load abnormals.Magnetic field detection module is arranged by installing magnetic element on impeller in the example scheme on spiral case,
It can quickly and efficiently detect impeller eccentric anomaly and air duct load abnormal, realize to impeller runnability and air duct property
The real time monitoring of energy.
2, the smoke machine main control unit in the embodiment of the present invention changes whether detection impeller occurs according to the amplitude of pulse signal
Eccentric anomaly includes：The amplitude variable quantity of pulse signal is compared with preset amplitude variable quantity threshold value；When pulse signal
When amplitude variable quantity is greater than or equal to amplitude variable quantity threshold value, there are eccentric anomalies for judgement impeller；When the amplitude of pulse signal becomes
When change amount is less than amplitude variable quantity threshold value, judgement impeller is normal.The example scheme principle is simple, easy to implement, and effectively, can
Row.
3, the magnetic element in the embodiment of the present invention includes one or more；When magnetic element includes multiple, smoke machine master
Control unit is additionally operable to obtain the amplitude variable quantity of pulse signal by following proposal：Calculating detects in preset detection cycle
Pulse signal corresponding with multiple magnetic elements amplitude average value；Calculate separately the corresponding pulse letter of multiple magnetic elements
Number amplitude in maximum value and minimum value and the average value difference absolute value；It will be in calculated two absolute values
Amplitude variable quantity of the higher value as pulse signal.Believed by calculating the corresponding pulse of multiple magnetic elements in the example scheme
Number amplitude average value, realize the self-calibration function of the pulse signal amplitude of multiple magnetic elements, it is accurate to improve calculating
Rate；And maximum value in the amplitude by calculating the corresponding pulse signal of multiple magnetic elements and minimum value and the average value
The absolute value of difference, using the higher value in calculated two absolute values as the amplitude variable quantity of pulse signal, it is ensured that number
According to validity, to improve the reliability of judging result.
4, the smoke machine main control unit in the embodiment of the present invention changes detection air duct according to the frequency of pulse signal and whether there is
Load abnormal includes：The rotation speed change amount of impeller is calculated according to the frequency variation of pulse signal；By the rotation speed change amount of impeller
Compared with preset rotation speed change amount threshold value；When the rotation speed change amount of impeller is greater than or equal to rotation speed change amount threshold value, sentence
Determining air duct, there are load abnormals；When the rotation speed change amount of impeller is less than rotation speed change amount threshold value, the load of judgement air duct is normal.It should
Example scheme calculates the rotation speed change amount of impeller by the frequency variation of pulse signal, and is carried out to the rotation speed change amount
Examination determines the size of air duct load, and principle is simple, easy to implement, and effective, feasible.
5, the magnetic element in the embodiment of the present invention includes the magnetic fin on newly-increased magnetic pole and/or impeller.The implementation
Example scheme is at low cost and easy to implement.
6, the hall sensing unit in the embodiment of the present invention is set in air-ducting ring and/or is set on electric machine support.It should
Hall sensing unit, which is set in air-ducting ring, in example scheme to be convenient for cleaning in a manner of easy to disassemble；Hall sensing
Unit, which is set on electric machine support, can reduce pollution of the greasy dirt to hall sensing unit.
7, the installation position of the hall sensing unit in the embodiment of the present invention meets：When magnetic element passes through hall sensing list
When first, the induction spacing between magnetic element and hall sensing unit meets：3-7 millimeters.The example scheme may insure suddenly
To the actual induction of magnetic element, the implementation for scheme in black silk his of the invention provides optimized integration for your sensing unit.
The other feature and advantage of the embodiment of the present invention will illustrate in the following description, also, partly from explanation
It is become apparent in book, or understand through the implementation of the invention.The purpose of the present invention and other advantages can be by illustrating
Specifically noted structure is realized and is obtained in book, claims and attached drawing.
Description of the drawings
Attached drawing is used for providing further understanding technical solution of the embodiment of the present invention, and one of constitution instruction
Point, the technical solution for explaining the present invention together with embodiments herein does not constitute the limit to technical solution of the present invention
System.
Fig. 1 is the kitchen ventilator spiral case part-structure schematic diagram of the embodiment of the present invention；
Fig. 2 is the impeller detecting system composition frame chart of the embodiment of the present invention；
Fig. 3 is the impeller eccentric anomaly detection scheme schematic diagram of the embodiment of the present invention；
Fig. 4 is the magnetic field pulse waveform diagram that the magnetic field detection module of the embodiment of the present invention detects；
Fig. 5 is the air duct load abnormal detection scheme schematic diagram of the embodiment of the present invention；
Fig. 6 is the structural schematic diagram when hall sensing unit of the embodiment of the present invention is set in first side；
Fig. 7 is the structural schematic diagram when hall sensing unit of the embodiment of the present invention is set in second side；
Structural representation when Fig. 8 is on the sheet metal component for the circumference that the hall sensing unit of the embodiment of the present invention is set to wound impeller
Figure；
Fig. 9 is the impeller detection method flow chart of the kitchen ventilator of the embodiment of the present invention.
Specific implementation mode
Understand in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing pair
The embodiment of the present invention is described in detail.It should be noted that in the absence of conflict, the embodiment in the application and reality
Applying the feature in example mutually can arbitrarily combine.
Step shown in the flowchart of the accompanying drawings can be in the computer system of such as a group of computer-executable instructions
It executes.Also, although logical order is shown in flow charts, and it in some cases, can be with suitable different from herein
Sequence executes shown or described step.
Embodiment one
A kind of impeller detecting system 1 of kitchen ventilator, as shown in Figure 1 and Figure 2, which may include：Motor（It is not shown）, snail
Shell 3 and air duct 4, spiral case 3 are connected to air duct 4；Impeller 5 is provided in spiral case 3, motor is rotated for impeller 5；Impeller detects
System 1 may include：The magnetic element 11 that is set on impeller 5, the magnetic field detection module 12 being set on spiral case 3 and smoke machine
Main control unit 13；
Magnetic field detection module 12 can be used for detecting the magnetic field that magnetic element 11 generates in 5 rotation process of impeller, and according to inspection
The magnetic field signal measured forms corresponding pulse signal；
Smoke machine main control unit 13, for changing whether detection impeller 5 eccentric anomaly, and root occurs according to the amplitude of pulse signal
It whether there is load abnormal according to the frequency variation detection air duct of pulse signal.
In embodiments of the present invention, it is arranged after magnetic element 11 on impeller 5, one can be formed in 5 rotation process of impeller
A magnetic field, when magnetic element 11 is by magnetic field detection module 12, magnetic field detection module 12 can sense the magnetic field, and can detect
Magnetic field signal, the magnetic field signal may include magnetic field amplitude and frequency.Magnetic field detection module 12 can believe the magnetic field detected
It number is handled, to generate corresponding pulse signal, and is transferred to smoke machine master after the pulse signal is amplified and is filtered
Unit 13 is controlled, to judge the situation of change of pulse signal by smoke machine main control unit 13, the wherein variation may include
Amplitude changes and frequency variation.
In embodiments of the present invention, passed through since magnetic element 11 may just occur when impeller 5 generates eccentric anomaly
When magnetic field detection module 12, neglects close or neglected far at a distance from magnetic field detection module 12, magnetic field detection module 12 detects at this time
Magnetic field intensity will neglect big or suddenly small, reflect to the amplitude of pulse signal will be made on pulse signal to carry out height variation, instead
It, if impeller 5 does not generate eccentric anomaly, when each magnetic element 11 is by magnetic field detection module 12, with magnetic field detection module
12 distance is identical, therefore the amplitude of the pulse signal obtained can also be maintained at constant, Huo Zhe in a fixed value
It is changed in error range.According to above-mentioned principle it is found that can be changed according to the amplitude of pulse signal whether to detect impeller 5
There is eccentric anomaly.
In embodiments of the present invention, when flue is busy or blocks, the load in smoke machine air duct can become smaller, so that electric
Machine load becomes smaller, and motor speed can increase at this time, and correspondingly the rotating speed of impeller 5 increases, the magnetism member being set on impeller 5
The rotating speed of part 11 also can accordingly increase, then the time Jing Guo magnetic field detection module 12 shorten, i.e. the magnetic field detection period becomes smaller, accordingly
Ground detects frequency and increases, and in reflection to corresponding pulse signal, the frequency of pulse signal can also increase；Conversely, when air duct is stifled
When plug, the load in smoke machine air duct can become larger, so that motor load becomes larger, motor speed can reduce at this time, correspondingly band
The rotating speed of movable vane wheel 5 reduces, and the rotating speed for the magnetic element 11 being set on impeller 5 also can accordingly reduce, then passes through magnetic field detection
The time of module 12 is elongated, i.e. the magnetic field detection period becomes larger, and correspondingly detects frequency and reduces, corresponding pulse signal is arrived in reflection
On, the frequency of pulse signal can also reduce.According to above-mentioned principle it is found that can be changed according to the frequency of pulse signal to detect
Air duct whether there is load abnormal.
In embodiments of the present invention, the specific installation position of magnetic element 11 and magnetic field detection module 12 is not limited
System, wherein the line of the installation position of magnetic element 11 and magnetic field detection module 12 can be parallel with the axial direction of impeller 5, with inspection
Survey the upward eccentric anomaly of impeller axle；The line of the installation position of magnetic element 11 and magnetic field detection module 12 can be with impeller 5
It is radial parallel, to detect the eccentric anomaly of impeller radially.Certainly, in the specific implementation, magnetic element 11 and magnetic field detection
The line of the installation position of module 12 can also detect the eccentric anomaly of impeller radially when parallel with the axial direction of impeller 5, but imitate
Fruit not as good as the installation position of magnetic element 11 and magnetic field detection module 12 line and impeller 5 it is radial parallel when detection result
It is good；Similarly, magnetic element 11 and the installation position of magnetic field detection module 12 line and impeller 5 it is radial parallel when can also
The upward eccentric anomaly of impeller axle is detected, but effect is not as good as the line of magnetic element 11 and the installation position of magnetic field detection module 12
Detection result when parallel with the axial direction of impeller 5 is good.
In embodiments of the present invention, the specific setting quantity of magnetic element 11 and magnetic field detection module 12 is not also limited
System.Wherein, magnetic element more than 11, sampling resolution is higher, and optionally, the embodiment of the present invention preferentially selects 4 magnetic poles, and
It can be arranged one at interval of 90 ° on impeller 5.
In embodiments of the present invention, by installing magnetic element on impeller, magnetic field detection module is set on spiral case, soon
Impeller eccentric anomaly and air duct load abnormal has been effectively detected out in speed, realizes to impeller runnability and air duct performance
Real time monitoring.
Embodiment two
As shown in figure 3, the embodiment gives the specific judgement scheme of impeller eccentric anomaly on the basis of embodiment one.
Optionally, smoke machine main control unit 13 changes whether detection impeller 5 eccentric anomaly occurs according to the amplitude of pulse signal
May include：
The amplitude variable quantity of pulse signal is compared with preset amplitude variable quantity threshold value；
When the amplitude variable quantity of pulse signal is greater than or equal to amplitude variable quantity threshold value, there are eccentric anomalies for judgement impeller；When
When the amplitude variable quantity of pulse signal is less than amplitude variable quantity threshold value, judgement impeller is normal.
In embodiments of the present invention, due under normal circumstances, micro bias being also likely to be present during impeller 5 is run,
But it generally can all be maintained within default error, not interfere with the normal use of kitchen ventilator.Therefore, during impeller 5 is run, such as
Fruit detects the amplitude variation of pulse signal, needs first to detect amplitude variation whether within default error, i.e. pulse signal
Amplitude variable quantity whether be less than above-mentioned amplitude variable quantity threshold value, if the amplitude variable quantity of pulse signal be greater than or equal to width
It is worth variable quantity threshold value, then can be determined that there are eccentric anomalies for impeller 5；If the amplitude variable quantity of pulse signal changes less than amplitude
Threshold value is measured, then can be determined that impeller 5 is normal.
In embodiments of the present invention, which can be according to specific application scenarios or smoke machine hardware condition
It is configured, its concrete numerical value is not limited.
In embodiments of the present invention, the example scheme can be described in detail for when magnetic element is 4：
If being equipped with 4 magnetic elements 11 on the impeller 5 of smoke machine, impeller 5 rotates a circle, then magnetic field detection module 12 will detect
To periodic 4 pulses, as shown in figure 4, wherein Y-axis represents the amplitude size of pulse output, X-axis represents pulse cycle time
Length.Ideally impeller runs not eccentric, the relative spacing one between 4 magnetic elements 11 and magnetic field detection module 12
Cause, and the invariablenes turning speed of motor is constant, then the impulse waveform that we sample be exactly constant cycle etc. amplitude pulses
Waveform.
If impeller 5 deforms on one side at this time causes bias, then the magnetic member of the one or more in this 90 ° of radians
The position of 11 relative magnetic field detection module 12 of part changes, then when 4 magnetic elements 11 are by magnetic field detection module 12,
Since relative position changes, magnetic field magnetic variations of flux, the amplitude phase for the pulse signal waveform that magnetic field detection module 12 exports are caused
To change, relative distance increase then amplitude reduce, relative distance reduce then amplitude increase, this when can be by 4
Pulse amplitude is compared, and amplitude variable quantity △ Am, comparison system bias amplitude variable quantity threshold value are obtained after finding differential waveform
As：
If continuous n detection cycle（N=20,50,100 etc.）△ Am >=As, then smoke machine main control unit judgement impeller is in the presence of eccentric
It is abnormal；
If continuous n detection cycle（N=20,50,100 etc.）△ Am ＜ As, then smoke machine main control unit judgement impeller is normal.
It in embodiments of the present invention, in the specific implementation can be only by the detection data of a detection cycle come to impeller
5 eccentric situations and air duct loading condition are judged that the detection cycle can be the time that impeller 5 rotates a circle.In other realities
It applies in example, in order to avoid the error of single detection is too big, influences judging result, the detection data of multiple detection cycles can be acquired
Judged, in the n period as escribed above, n is positive integer.
In embodiments of the present invention, when being judged, can sentence when continuous n detection cycle is satisfied by △ Am >=As
Determining impeller, there are eccentric anomalies, and judge that impeller is normal when continuous n detection cycle is satisfied by △ Am ＜ As；It can also be
It is eccentric to can determine that impeller exists in n detection cycle, when meeting the number of Am >=As more than or equal to preset frequency threshold value m
It is abnormal, wherein m is the positive integer less than n.
In embodiments of the present invention, it when magnetic element 11 is one, is only corresponded to by detecting a magnetic element 11
The amplitude variable quantity of pulse signal can obtain the eccentric situation of impeller 5.It is such as above-mentioned when magnetic element 11 is multiple
It 4, needs to handle the variation of the amplitude of the pulse signal of collected four magnetic elements 11 final to obtain one
The amplitude variable quantity of pulse signal is used as the basis for estimation of the eccentric situation of impeller 5.Specifically, doing of averaging may be used
Method can also be weighted according to preset ranking operation method, its concrete methods of realizing is not limited herein.
Embodiment three
As shown in figure 3, the embodiment on the basis of embodiment two to magnetic element 11 include it is multiple when pulse signal amplitude
The acquisition methods of variable quantity further limit.
Optionally, magnetic element 11 may include one or more；
When magnetic element 11 includes multiple, smoke machine main control unit 13 can be also used for obtaining pulse signal by following proposal
Amplitude variable quantity：
Calculate the average value of the amplitude of the pulse signal corresponding with multiple magnetic elements detected in preset detection cycle；
Calculate separately maximum value in the amplitude of the corresponding pulse signal of multiple magnetic elements and minimum value and the average value
The absolute value of difference；
Using the higher value in calculated two absolute values as the amplitude variable quantity of pulse signal.
In embodiments of the present invention, still the example scheme can be described in detail for when magnetic element 11 is 4：
When smoke machine is run, smoke machine main control unit 13 carries out fan operation pulse detection, determines whether to be magnetic by interrupting detection
Element 11 by and generate pulse, if detecting pulse-break, at this time smoke machine main control unit 13 sample current PRF amplitude
Data An, when 4 magnetic elements 11 are arranged on impeller 5, then smoke machine main control unit 13 will sample continuous 4 pulse amplitudes
A1, A2, A3, A4, then impeller just turns over a circle at this time, smoke machine main control unit 13 carries out operation to the data of sampling, can be with
Maximum value Amax and minimum value Amin therein is obtained by bubbling method or comparison algorithm.
The average value of 4 pulse amplitudes is：Aav=（A1+A2+A3+A4）/4（Realize the self-alignment function of sampled value）；
The amplitude variable quantity 1 of maximum value Amax：△ Am1=| Amax-Aav |, minimum value Amin amplitudes variable quantity 2：△Am2=|
Amin-Aav|；
The greater in △ Am1, △ Am2 can be taken to pass through comparison △ Am and preset system impeller as amplitude variable quantity △ Am
Eccentric amplitude variable quantity threshold value A s can there are eccentric anomalies with preliminary judgement impeller 5 if △ Am >=As；If △ Am ＜
As, then can be normal with preliminary judgement impeller 5.
In embodiments of the present invention, if there are eccentric anomalies for 13 preliminary judgement impeller 5 of smoke machine main control unit, can continue
The sampling for being carried out continuously n period confirms, if the sampling pulse amplitude variable quantity △ Am in the continuous n period are all higher than
As, then smoke machine main control unit 13 can finally judge impeller 5, there are eccentric anomalies, and warning reminding user carries out impeller maintenance
Maintenance.
Example IV
As shown in figure 5, the embodiment gives the specific judgement scheme of air duct load abnormal on the basis of embodiment one.
Optionally, smoke machine main control unit 13 can with the presence or absence of load abnormal according to the frequency of pulse signal variation detection air duct
To include：
The rotation speed change amount of impeller is calculated according to the frequency variation of pulse signal；
The rotation speed change amount of impeller is compared with preset rotation speed change amount threshold value；
When the rotation speed change amount of impeller is greater than or equal to rotation speed change amount threshold value, there are load abnormals in judgement air duct；Work as impeller
Rotation speed change amount when being less than rotation speed change amount threshold value, the load of judgement air duct is normal.
In embodiments of the present invention, in the above content it is known that the variation of air duct load can influence the variation of wheel speed,
Due under normal circumstances, air duct loading condition can not possibly be held in constant under a state, i.e. air duct loading condition constantly may be used
There can be fluctuation, so as to cause the variation of the frequency of pulse signal, and accordingly cause the rotation speed change of impeller 5, but generally all can
It is maintained within default error, does not interfere with the normal use of kitchen ventilator.Therefore, during impeller 5 is run, if detecting arteries and veins
Whether the frequency variation for rushing signal needs first to detect the rotation speed change default to obtain the rotation speed change of corresponding impeller 5
Within error, i.e., the rotation speed change amount of impeller is less than rotation speed change amount threshold value, if the rotation speed change amount of impeller is greater than or equal to
Rotation speed change amount threshold value then can be determined that there are load abnormals in air duct；If the rotation speed change amount of impeller is less than rotation speed change amount
Threshold value then can be determined that air duct load is normal.
In embodiments of the present invention, which can be according to specific application scenarios or smoke machine hardware condition
It is configured, its concrete numerical value is not limited.
In embodiments of the present invention, on the basis of said program, when smoke machine main control unit 13 is under respective notch, detection
When going out the rotation speed change amount of impeller more than or equal to rotation speed change amount threshold value, the tachometer value of motor can be further detected, if
It is more than preset motor speed change threshold Vs that motor speed value, which changes △ V, then can further determine load abnormal.
In embodiments of the present invention, it when magnetic element 11 is one, is only corresponded to by detecting a magnetic element 11
Pulse signal frequency variation, can obtain the loading condition in air duct to obtain corresponding rotation speed change amount.In magnetic
Property element 11 when being multiple, such as above-mentioned 4, need to the variation of the frequency of the pulse signal of collected 4 magnetic elements 11
Corresponding wheel speed variation is handled, and is used as air duct loading condition to obtain a final wheel speed variable quantity
Basis for estimation.Specifically, the method averaged may be used, fortune can also be weighted according to preset ranking operation method
It calculates, its concrete methods of realizing is not limited herein.
Embodiment five
As shown in figure 5, the embodiment has done into one the acquisition methods of the rotation speed change amount of impeller on the basis of example IV
Step limits.
Optionally, magnetic element 11 may include one or more；
When magnetic element 11 includes multiple, smoke machine main control unit 13 calculates turning for impeller according to the frequency variation of pulse signal
Fast variable quantity may include：
Acquire the frequency values of the corresponding pulse signal of multiple magnetic elements respectively in multiple rotation periods of impeller；
The corresponding pulse period is calculated according to the frequency values of pulse signal；
According to rotating speed calculation formula and the pulse period, collected multiple magnetism in multiple rotation periods are calculated separately out
The tachometer value of the corresponding impeller of frequency values of the pulse signal of element；
Calculate the average value of multiple tachometer values；
Calculate the absolute value of average value and the difference of preset motor speed, the rotation speed change amount as impeller.
In embodiments of the present invention, still the example scheme can be described in detail for when magnetic element 11 is 4：
When smoke machine is run, it can be scaled the pulse period after the frequency of acquisition pulse signal, can also directly acquisition pulse believed
Number period, illustrated by taking the period of direct acquisition pulse signal as an example herein：It can be such as aforementioned schemes, equally to interrupt shape
Formula is detected the period of pulse signal, and smoke machine main control unit 13 can sample the periodicity of continuous two pulse signals at this time
According to Tn, when 4 magnetic elements 11 are arranged on impeller 5, then impeller 5, which is run one week, can sample 3 pulse periods, in order to ensure
The precision and stability of sampling, smoke machine main control unit 13 can sample continuous 39 pulse periods（10 circles）T1、T2、T3…
T39, then data progress operation of the smoke machine main control unit 13 to sampling：
Pulse period corresponding tachometer value：Vn=60/（4*Tn）；
Period average：Vav=（V1+V2+V3+…+V39）/39；
Rotation speed change amount：△ V=| Vav-Vm |, wherein Vm is the reference rotation velocity of corresponding motor gear（I.e. above-mentioned is preset
Motor speed）；
By comparing △ V and preset rotation speed change amount threshold value Vs, if △ V >=Vs, smoke machine main control unit 13 can be first
Step judgement air duct load changes；If △ V ＜ As, smoke machine main control unit 13 can be with the fluctuations of load of preliminary judgement air duct
Normally.
In embodiments of the present invention, if the load of preliminary judgement air duct changes, smoke machine main control unit 13 can be with
It is carried out continuously multiple periods（Such as 10）Sampling confirm, if the sampling air duct load in continuous multiple a periods is different
Often, then smoke machine main control unit 13 can finally judge air duct load abnormal.
Embodiment six
As shown in figs. 3 and 5, which gives impeller eccentric anomaly and air duct is negative on the basis of above-mentioned any embodiment
Carry the processing scheme under abnormal conditions.
Optionally, smoke machine main control unit 13 can be also used for：In judgement air duct, there are when load abnormal, improve turning for motor
Speed, to be changed come the load of compensation wind channel by improving air quantity；And current rotating speed is kept when compensating effective, when compensating invalid
It alarms.
In embodiments of the present invention, smoke machine main control unit 13 can improve one grade of motor speed, by the side for improving air quantity
Formula carrys out compensation wind channel load variation, to improve smoke machine wind pressure, it is ensured that then the smooth smoke evacuation in air duct carries out air duct load detecting again
Flow：
If after being improved by motor speed, detecting that motor speed variable quantity is less than rotation speed change amount threshold in smoke machine operational process
Value Vs then shows that air duct load compensation is effective, and smoke machine can maintain current rotating speed to run；If motor speed is increased to highest
Shelves detect that motor speed variable quantity is still greater than or equal to rotation speed change amount threshold value Vs in smoke machine operational process, then shows wind
Road load compensation is invalid, and smoke machine main control unit 13 can carry out maintenance test with warning reminding user to air duct, keep stopping for smoke machine
Return valve folding, smoke pipe and oil network cleannes etc..
Optionally, smoke machine main control unit 13 can be also used for：When judging impeller eccentric anomaly, issues the user with maintenance and carry
It wakes up.
In embodiments of the present invention, smoke machine main control unit 13 detect impeller bias deposit when abnormal in time remind user into
Row maintaining avoids prolonged eccentric work from causing motor damage.
Embodiment seven
As shown in Fig. 6, Fig. 7, Fig. 8, which gives the specific of magnetic element 11 on the basis of above-mentioned any embodiment
Example scheme.
Optionally, magnetic element 11 may include the magnetic fin 11-2 on newly-increased magnetic pole 11-1 and/or impeller.
In embodiments of the present invention, it when magnetic element 11 includes newly-increased magnetic pole, since magnetic pole itself has weight, needs
Newly-increased magnetic pole is carried out on impeller 5 it is symmetrical, so as to ensure to increase impeller 5 after magnetic pole be maintained to it is relatively flat
Weighing apparatus will not be arranged asymmetry because of magnetic pole and impeller 5 is caused to lay particular stress on, cause turbine centrifugal abnormal phenomenon.
In embodiments of the present invention, can be the pole configuration increased newly when newly-increased magnetic pole fails to carry out symmetrical
Corresponding counterweight lays particular stress on problem with the magnetic pole for offsetting newly-increased caused by weight itself.
In embodiments of the present invention, for newly-increased magnetic pole due to small volume, the magnetic field range correspondingly generated is also small, can be with
Magnetic field detection module 12 could be made to detect magnetic when ensuring magnetic pole only at the installation position for turning to magnetic field detection module 12
The changes of magnetic field of pole so that magnetic field detection becomes apparent from, so as to increase fault detection accuracy.
In embodiments of the present invention, it is not increase lateral opening hole installation using magnetic fin as the advantages of magnetic element 11
Magnetic pole, production technology is relatively easy, but due to the magnetic area that magnetic fin generates is big so that magnetic field detection module 12 may
It can be able to detect that changes of magnetic field in real time, even if so that impeller 5 is in the magnetic flux change for occurring to sense when centrifugation is abnormal
Also unobvious, to reduce fault detection accuracy.
In embodiments of the present invention, the setting quantity of newly-increased magnetic pole and magnetic fin can be according to concrete application scene
It is configured, its particular number is not limited.
Embodiment eight
The embodiment gives the specific embodiment scheme of magnetic field detection module 12 on the basis of above-mentioned any embodiment.
Optionally, as shown in Figure 6, Figure 7, spiral case 3 may include the first side and the second side for being located at 5 both sides of impeller
Face is provided with air-ducting ring 31 in first side, electric machine support 32 is provided in second side；Magnetic field detection module 12 may include
Hall sensing unit 121 and signal processing unit 122；
Hall sensing unit 121 is used to detect the magnetic field of the generation of magnetic element 11, and signal processing unit 122 according to magnetic field for believing
Number formed pulse signal；
Hall sensing unit 121 can be set in air-ducting ring 31 and/or be set on electric machine support 32.
In embodiments of the present invention, as shown in fig. 6, when hall sensing unit 121 is set in first side, Hall sense
Answer unit 121 that can be set in air-ducting ring 31 or be set on the sheet metal component a in first side, magnetic element 11 can be at this time
It is correspondingly set on impeller 5 close to first side（The installation site of hall sensing unit 121 can be specifically proximate to）Position
It sets, such as close to air-ducting ring 31.The installation site of hall sensing unit 121 requires to pass through hall sensing when magnetic element 11 at this time
When unit 121, with hall sensing unit 121 and magnetic element 11 just with respect to or with smaller angle, so that magnetic first
The magnetic field that part 11 is generated by that can sense magnetic element 11 when hall sensing unit 121.
In embodiments of the present invention, can be easy to disassemble when hall sensing unit 121 is set in air-ducting ring 31, it is convenient for
Cleaning.
In embodiments of the present invention, plastic cement sealing may be used in hall sensing unit 121 or encapsulating mode is installed,
It trepanning can be installed in air-ducting ring 51, it is therefore intended that while ensureing induction validity, moreover it is possible to prevent greasy dirt to hall sensing list
The pollution of member 121, and even if the head of hall sensing unit 121 is contaminated, it can be relative to the magnetic flux of magnetic element 11
Variable quantity detection remains to be consistent, and is influenced on testing result smaller.
In embodiments of the present invention, as shown in fig. 7, when hall sensing unit 121 is set in second side, Hall sense
Answer unit 121 that can be set on electric machine support 32 or be set on the sheet metal component b in second side, magnetic element 11 can at this time
To be correspondingly set on impeller 5 close to second side（The installation site of hall sensing unit 121 can be specifically proximate to）'s
On position, such as close to electric machine support 32.The installation site of hall sensing unit 121 is also required that when magnetic element 11 passes through at this time
When hall sensing unit 121, with hall sensing unit 121 and magnetic element 11 just with respect to or with smaller angle, so that
Obtain the magnetic field that magnetic element 11 is generated by that can sense magnetic element 11 when hall sensing unit 121.
In embodiments of the present invention, hall sensing unit 121 is set on electric machine support 32 or is set in second side
Sheet metal component on when, it is possible to reduce pollution of the greasy dirt to hall sensing unit 121, but relative to the knot being installed in air-ducting ring
Structure, follow-up cleaning are more troublesome.
In embodiments of the present invention, the sheet metal component in the second side of spiral case 12 may be used punching press heavy platform mode and install,
To ensure the induction spacing of hall sensing unit 121 and the magnetic element 11 on impeller 5.
In embodiments of the present invention, as shown in figure 8, hall sensing unit 121 can also be set to around the impeller 5
On the sheet metal component c of circumference and it is set in the volute tongue of air duct.
In embodiments of the present invention, when hall sensing unit 121 is set on the sheet metal component of the circumference of the impeller 5
And when being set in the volute tongue of air duct, the installation site of hall sensing unit 121 can be relatively flat with the magnetic fin on impeller 5
Row.
In embodiments of the present invention, hall sensing unit 121 be set on the sheet metal component of the circumference of the impeller 5 with
And be set in the volute tongue of air duct and can reduce oil pollution, mounting means is simple, and it is moderate that subsequent maintenance maintains difficulty.
In embodiments of the present invention, hall sensing unit 121 can be realized by Hall sensor.
In embodiments of the present invention, the installation position for signal processing unit 122 and type selecting are not required, can be with
Self-defining according to different needs.
Embodiment nine
The embodiment is on the basis of above-mentioned any embodiment, between hall sensing unit 121 and magnetic element 11
Setting distance is further defined.
Optionally, the installation position of hall sensing unit 121 meets：When magnetic element 11 is by hall sensing unit 121
When, the induction spacing between magnetic element 11 and hall sensing unit 121 meets：3-7 millimeters.
In embodiments of the present invention, in order to ensure that hall sensing unit 121 is detected magnetic element 11 while again
It is avoided that because of constructive interference problem caused by the bias of impeller 5；Spacing between magnetic element 11 and hall sensing unit 121
Design can select to meet 3-7mm（, such as 5mm can be selected.
Embodiment ten
A kind of impeller detection method of kitchen ventilator, the kitchen ventilator may include：Motor, spiral case and air duct, spiral case are connected to air duct；
Impeller is provided in spiral case, motor is rotated for impeller；Magnetic element is provided on impeller, as shown in figure 9, this method can
To include S101-S102：
S101, the magnetic field for detecting magnetic element generation by preset magnetic field detection module during wheel rotation, and according to
The magnetic field signal detected forms corresponding pulse signal；
S102, change whether detection impeller eccentric anomaly occurs according to the amplitude of pulse signal, and according to the frequency of pulse signal
Rate variation detection air duct whether there is load abnormal.
In embodiments of the present invention, any embodiment in above-mentioned system embodiment is suitable for this method embodiment
In, this is no longer going to repeat them.
The advantageous effect of the embodiment of the present invention includes：
1, the kitchen ventilator in the embodiment of the present invention includes：Motor, spiral case and air duct, spiral case are connected to air duct；It is provided in spiral case
Impeller, motor are rotated for impeller；Impeller detecting system includes：The magnetic element that is set on impeller is set to spiral case
On magnetic field detection module and smoke machine main control unit；Magnetic field detection module, for detecting magnetic member during wheel rotation
The magnetic field that part generates, and corresponding pulse signal is formed according to the magnetic field signal detected；Smoke machine main control unit, for according to arteries and veins
Whether the amplitude variation detection impeller for rushing signal there is eccentric anomaly, and is according to the frequency of pulse signal variation detection air duct
It is no that there are load abnormals.Magnetic field detection module is arranged by installing magnetic element on impeller in the example scheme on spiral case,
It can quickly and efficiently detect impeller eccentric anomaly and air duct load abnormal, realize to impeller runnability and air duct property
The real time monitoring of energy.
2, the smoke machine main control unit in the embodiment of the present invention changes whether detection impeller occurs according to the amplitude of pulse signal
Eccentric anomaly includes：The amplitude variable quantity of pulse signal is compared with preset amplitude variable quantity threshold value；When pulse signal
When amplitude variable quantity is greater than or equal to amplitude variable quantity threshold value, there are eccentric anomalies for judgement impeller；When the amplitude of pulse signal becomes
When change amount is less than amplitude variable quantity threshold value, judgement impeller is normal.The example scheme principle is simple, easy to implement, and effectively, can
Row.
3, the magnetic element in the embodiment of the present invention includes one or more；When magnetic element includes multiple, smoke machine master
Control unit is additionally operable to obtain the amplitude variable quantity of pulse signal by following proposal：Calculating detects in preset detection cycle
Pulse signal corresponding with multiple magnetic elements amplitude average value；Calculate separately the corresponding pulse letter of multiple magnetic elements
Number amplitude in maximum value and minimum value and the average value difference absolute value；It will be in calculated two absolute values
Amplitude variable quantity of the higher value as pulse signal.Believed by calculating the corresponding pulse of multiple magnetic elements in the example scheme
Number amplitude average value, realize the self-calibration function of the pulse signal amplitude of multiple magnetic elements, it is accurate to improve calculating
Rate；And maximum value in the amplitude by calculating the corresponding pulse signal of multiple magnetic elements and minimum value and the average value
The absolute value of difference, using the higher value in calculated two absolute values as the amplitude variable quantity of pulse signal, it is ensured that number
According to validity, to improve the reliability of judging result.
4, the smoke machine main control unit in the embodiment of the present invention changes detection air duct according to the frequency of pulse signal and whether there is
Load abnormal includes：The rotation speed change amount of impeller is calculated according to the frequency variation of pulse signal；By the rotation speed change amount of impeller
Compared with preset rotation speed change amount threshold value；When the rotation speed change amount of impeller is greater than or equal to rotation speed change amount threshold value, sentence
Determining air duct, there are load abnormals；When the rotation speed change amount of impeller is less than rotation speed change amount threshold value, the load of judgement air duct is normal.It should
Example scheme calculates the rotation speed change amount of impeller by the frequency variation of pulse signal, and is carried out to the rotation speed change amount
Examination determines the size of air duct load, and principle is simple, easy to implement, and effective, feasible.
5, the magnetic element in the embodiment of the present invention includes the magnetic fin on newly-increased magnetic pole and/or impeller.The implementation
Example scheme is at low cost and easy to implement.
6, the hall sensing unit in the embodiment of the present invention is set in air-ducting ring and/or is set on electric machine support.It should
Hall sensing unit, which is set in air-ducting ring, in example scheme to be convenient for cleaning in a manner of easy to disassemble；Hall sensing
Unit, which is set on electric machine support, can reduce pollution of the greasy dirt to hall sensing unit.
7, the installation position of the hall sensing unit in the embodiment of the present invention meets：When magnetic element passes through hall sensing list
When first, the induction spacing between magnetic element and hall sensing unit meets：3-7 millimeters.The example scheme may insure suddenly
To the actual induction of magnetic element, the implementation for scheme in black silk his of the invention provides optimized integration for your sensing unit.
It will appreciated by the skilled person that whole or certain steps in method disclosed hereinabove, system, dress
Function module/unit in setting may be implemented as software, firmware, hardware and its combination appropriate.In hardware embodiment,
Division between the function module/unit referred in the above description not necessarily corresponds to the division of physical assemblies；For example, one
Physical assemblies can have multiple functions or a function or step that can be executed by several physical assemblies cooperations.Certain groups
Part or all components may be implemented as by processor, such as the software that digital signal processor or microprocessor execute, or by
It is embodied as hardware, or is implemented as integrated circuit, such as application-specific integrated circuit.Such software can be distributed in computer-readable
On medium, computer-readable medium may include computer storage media（Or non-transitory medium）And communication media（Or temporarily
Property medium）.As known to a person of ordinary skill in the art, term computer storage medium is included in for storing information（Such as
Computer-readable instruction, data structure, program module or other data）Any method or technique in the volatibility implemented and non-
Volatibility, removable and nonremovable medium.Computer storage media include but not limited to RAM, ROM, EEPROM, flash memory or
Other memory technologies, CD-ROM, digital versatile disc（DVD）Or other optical disc storages, magnetic holder, tape, disk storage or its
His magnetic memory apparatus or any other medium that can be used for storing desired information and can be accessed by a computer.
In addition, known to a person of ordinary skill in the art be, communication media generally comprises computer-readable instruction, data structure, program
Other data in the modulated data signal of module or such as carrier wave or other transmission mechanisms etc, and may include any letter
Cease delivery media.
Claims (10)
1. a kind of impeller detecting system of kitchen ventilator, the kitchen ventilator include：Motor, spiral case and air duct, the spiral case with it is described
Air duct is connected to；Impeller is provided in the spiral case, the motor is for driving the wheel rotation；It is characterized in that, the leaf
Taking turns detecting system includes：The magnetic element that is set on the impeller, the magnetic field detection module being set on the spiral case and
Smoke machine main control unit；
The magnetic field detection module, the magnetic field generated for detecting the magnetic element during wheel rotation, and root
Corresponding pulse signal is formed according to the magnetic field signal detected；
The smoke machine main control unit, it is eccentric different for whether being occurred according to the amplitude of the pulse signal variation detection impeller
Often, and the air duct is detected according to the variation of the frequency of the pulse signal and whether there is load abnormal.
2. the impeller detecting system of kitchen ventilator according to claim 1, which is characterized in that the smoke machine main control unit according to
Whether the amplitude variation detection impeller of the pulse signal, which eccentric anomaly occurs, includes：
The amplitude variable quantity of the pulse signal is compared with preset amplitude variable quantity threshold value；
When the amplitude variable quantity of the pulse signal is greater than or equal to the amplitude variable quantity threshold value, judge that the impeller exists
Eccentric anomaly；When the amplitude variable quantity of the pulse signal is less than the amplitude variable quantity threshold value, judge that the impeller is normal.
3. the impeller detecting system of kitchen ventilator according to claim 2, which is characterized in that the magnetic element includes one
Or it is multiple；
When the magnetic element includes multiple, the smoke machine main control unit is additionally operable to obtain the pulse letter by following proposal
Number amplitude variable quantity：
Calculate the flat of the amplitude of the pulse signal corresponding with multiple magnetic elements detected in preset detection cycle
Mean value；
The maximum value and minimum value calculated separately in the amplitude of the corresponding pulse signal of multiple magnetic elements is put down with described
The absolute value of the difference of mean value；
Using the higher value in calculated two absolute values as the amplitude variable quantity of the pulse signal.
4. the impeller detecting system of kitchen ventilator according to claim 1, which is characterized in that the smoke machine main control unit according to
The frequency variation of the pulse signal detects the air duct and includes with the presence or absence of load abnormal：
The rotation speed change amount of the impeller is calculated according to the frequency variation of the pulse signal；
The rotation speed change amount of the impeller is compared with preset rotation speed change amount threshold value；
When the rotation speed change amount of the impeller is greater than or equal to the rotation speed change amount threshold value, judge that the air duct has load
It is abnormal；When the rotation speed change amount of the impeller is less than the rotation speed change amount threshold value, judge that the air duct load is normal.
5. the impeller detecting system of kitchen ventilator according to claim 4, which is characterized in that the magnetic element includes one
Or it is multiple；
When the magnetic element includes multiple, the smoke machine main control unit is calculated according to the frequency variation of the pulse signal
The rotation speed change amount of the impeller includes：
Acquire the frequency values of the corresponding pulse signal of multiple magnetic elements respectively in multiple rotation periods of the impeller；
The corresponding pulse period is calculated according to the frequency values of the pulse signal；
According to rotating speed calculation formula and the pulse period, calculate separately out collected more in the multiple rotation period
The tachometer value of the corresponding impeller of frequency values of the pulse signal of a magnetic element；
Calculate the average value of multiple tachometer values；
Calculate the absolute value of the average value and the difference of preset motor speed, the rotation speed change amount as the impeller.
6. the impeller detecting system of the kitchen ventilator according to claim 1,4 or 5, which is characterized in that the smoke machine master control list
Member is additionally operable to：In the judgement air duct there are when load abnormal, the rotating speed of the motor is improved, to be compensated by improving air quantity
The load in the air duct changes；And current rotating speed is kept when the compensation is effective, it alarms when the compensation is invalid.
7. the impeller detecting system of the kitchen ventilator according to claim 1-5 any one, which is characterized in that the magnetic member
Part includes the magnetic fin on newly-increased magnetic pole and/or the impeller.
8. the impeller detecting system of kitchen ventilator according to claim 7, which is characterized in that the spiral case includes being located at
The first side and second side of the impeller both sides are provided with air-ducting ring in the first side, are set in the second side
It is equipped with electric machine support；The magnetic field detection module includes hall sensing unit and signal processing unit；
The hall sensing unit is used to detect the magnetic field that the magnetic element generates, and the signal processing unit is used for according to institute
It states magnetic field signal and forms the pulse signal；
The hall sensing unit is set in the air-ducting ring and/or is set on the electric machine support.
9. the impeller detecting system of kitchen ventilator according to claim 8, which is characterized in that
The installation position of the hall sensing unit meets：It is described when the magnetic element passes through the hall sensing unit
Induction spacing between magnetic element and the hall sensing unit meets：3-7 millimeters.
10. a kind of impeller detection method of kitchen ventilator, the kitchen ventilator include：Motor, spiral case and air duct, the spiral case with it is described
Air duct is connected to；Impeller is provided in the spiral case, the motor is for driving the wheel rotation；It is characterized in that, the leaf
Magnetic element is provided on wheel, the method includes：
The magnetic field that the magnetic element generates, and root are detected by preset magnetic field detection module during the wheel rotation
Corresponding pulse signal is formed according to the magnetic field signal detected；
It detects whether the impeller eccentric anomaly occurs according to the variation of the amplitude of the pulse signal, and is believed according to the pulse
Number frequency variation detect the air duct and whether there is load abnormal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810365659.5A CN108332651B (en) | 2018-04-23 | 2018-04-23 | System and method for detecting impeller of range hood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810365659.5A CN108332651B (en) | 2018-04-23 | 2018-04-23 | System and method for detecting impeller of range hood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108332651A true CN108332651A (en) | 2018-07-27 |
| CN108332651B CN108332651B (en) | 2020-10-27 |
Family
ID=62934514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810365659.5A Active CN108332651B (en) | 2018-04-23 | 2018-04-23 | System and method for detecting impeller of range hood |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108332651B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112377604A (en) * | 2020-12-01 | 2021-02-19 | 浙江恒齿传动股份有限公司 | Intelligent speed reducer |
| CN112443506A (en) * | 2019-08-29 | 2021-03-05 | 宁波方太厨具有限公司 | Impeller detection method in centralized smoke exhaust system of building |
| CN112443505A (en) * | 2019-08-29 | 2021-03-05 | 宁波方太厨具有限公司 | Impeller detection method in centralized smoke exhaust system of building |
| CN112443503A (en) * | 2019-08-29 | 2021-03-05 | 宁波方太厨具有限公司 | Impeller detection method in centralized smoke exhaust system of building |
| CN115347742A (en) * | 2022-10-19 | 2022-11-15 | 常州市美特精密电机有限公司 | Direct current motor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1140211A (en) * | 1995-03-29 | 1997-01-15 | 三洋电机株式会社 | Centrifugal hydroextracting apparatus |
| CN101029900A (en) * | 2007-02-06 | 2007-09-05 | 鲁东大学 | Apparatus and method for measuring rotation-axis speed by impulse |
| CN102155984A (en) * | 2010-12-30 | 2011-08-17 | 北京四方继保自动化股份有限公司 | General vibration signal measuring system of fan |
| CN202126441U (en) * | 2011-05-31 | 2012-01-25 | 上海音达科技集团有限公司北京分公司 | Inspection device of wind speed |
| CN106643472A (en) * | 2017-02-08 | 2017-05-10 | 中国航发沈阳发动机研究所 | Measurement method of installing concentricity of engine case and rotor |
| CN107013421A (en) * | 2017-06-12 | 2017-08-04 | 国电联合动力技术有限公司 | A kind of wind power generating set wheel speed measuring method and system |
-
2018
- 2018-04-23 CN CN201810365659.5A patent/CN108332651B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1140211A (en) * | 1995-03-29 | 1997-01-15 | 三洋电机株式会社 | Centrifugal hydroextracting apparatus |
| CN101029900A (en) * | 2007-02-06 | 2007-09-05 | 鲁东大学 | Apparatus and method for measuring rotation-axis speed by impulse |
| CN102155984A (en) * | 2010-12-30 | 2011-08-17 | 北京四方继保自动化股份有限公司 | General vibration signal measuring system of fan |
| CN202126441U (en) * | 2011-05-31 | 2012-01-25 | 上海音达科技集团有限公司北京分公司 | Inspection device of wind speed |
| CN106643472A (en) * | 2017-02-08 | 2017-05-10 | 中国航发沈阳发动机研究所 | Measurement method of installing concentricity of engine case and rotor |
| CN107013421A (en) * | 2017-06-12 | 2017-08-04 | 国电联合动力技术有限公司 | A kind of wind power generating set wheel speed measuring method and system |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112443506A (en) * | 2019-08-29 | 2021-03-05 | 宁波方太厨具有限公司 | Impeller detection method in centralized smoke exhaust system of building |
| CN112443505A (en) * | 2019-08-29 | 2021-03-05 | 宁波方太厨具有限公司 | Impeller detection method in centralized smoke exhaust system of building |
| CN112443503A (en) * | 2019-08-29 | 2021-03-05 | 宁波方太厨具有限公司 | Impeller detection method in centralized smoke exhaust system of building |
| CN112443505B (en) * | 2019-08-29 | 2022-02-18 | 宁波方太厨具有限公司 | Impeller detection method in centralized smoke exhaust system of building |
| CN112443503B (en) * | 2019-08-29 | 2022-03-18 | 宁波方太厨具有限公司 | Impeller detection method in centralized smoke exhaust system of building |
| CN112377604A (en) * | 2020-12-01 | 2021-02-19 | 浙江恒齿传动股份有限公司 | Intelligent speed reducer |
| CN112377604B (en) * | 2020-12-01 | 2021-12-14 | 浙江恒齿传动股份有限公司 | Intelligent speed reducer |
| CN115347742A (en) * | 2022-10-19 | 2022-11-15 | 常州市美特精密电机有限公司 | Direct current motor |
| CN115347742B (en) * | 2022-10-19 | 2023-01-06 | 常州市美特精密电机有限公司 | Direct current motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108332651B (en) | 2020-10-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108332651A (en) | A kind of the impeller detecting system and method for kitchen ventilator | |
| JP2002323369A (en) | Operation method of machine, inference method of vibration and system thereof | |
| CA2929831C (en) | Method for reducing error in rotor speed measurements | |
| US10254773B2 (en) | Devices, systems, and methods for balancing closely coupled rotating machinery | |
| CN103308707A (en) | Self-adaptation rotating speed measurement method | |
| CA2647474C (en) | Method and apparatus for monitoring the rotational speed of the shaft of a gas turbine | |
| US11067591B2 (en) | System and method for determining angular displacement, velocity and acceleration of a rotating member mounted to a platform | |
| CN102966582B (en) | For determining the method and apparatus of the mass change of draught fan impeller | |
| CN103868649A (en) | On-line dynamic balancing correction method for rotors of double-rotor axial flow fan | |
| GB2455800A (en) | Method and apparatus for monitoring the rotational speed of a shaft | |
| CN101478285B (en) | Motor speed detection method | |
| JP2008039537A (en) | Apparatus for measuring state quantity of rotary member | |
| CN108361079B (en) | Rotor vibration control method and control device | |
| JP2015102402A (en) | Turbine blade vibration displacement evaluation method and turbine blade vibration displacement evaluation apparatus | |
| CN108826392A (en) | A kind of real-time impeller detection system and method for kitchen ventilator | |
| CN112697438A (en) | Turboprop engine pitch-phase angle-rotating speed measuring device and method based on tone wheel | |
| CN101795107B (en) | Method for detecting motor speed | |
| CN113227796B (en) | Method and device for determining the rotational frequency of a wheel | |
| JP2022544314A (en) | A method for quantitatively measuring variables dependent on the current operating state of a fan, in particular a pressure change or pressure rise, and a fan | |
| CN109072709A (en) | Turbine system and method for coupling turbine system | |
| EP3887589B1 (en) | Washing machine and control method thereof | |
| CN209283040U (en) | A kind of speed detection system for magnetic suspension motor | |
| JP2023521241A (en) | Method and apparatus for determining wheel rotation frequency | |
| CN103983802A (en) | Signal processing method and device | |
| CN116412082A (en) | Wind turbine generator impeller balance evaluation method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230620 Address after: Building 2, No. 52, 22nd Street, Baiyang Street, Qiantang New District, Hangzhou City, Zhejiang Province, 310000 Patentee after: Hangzhou Jiuchuang Home Appliances Co.,Ltd. Address before: No. 999, Mei Li Road, Huaiyin District, Ji'nan, Shandong Patentee before: JOYOUNG Co.,Ltd. |