CN112240579A - Range hood and control method thereof - Google Patents
Range hood and control method thereof Download PDFInfo
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- CN112240579A CN112240579A CN201910646836.1A CN201910646836A CN112240579A CN 112240579 A CN112240579 A CN 112240579A CN 201910646836 A CN201910646836 A CN 201910646836A CN 112240579 A CN112240579 A CN 112240579A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000012360 testing method Methods 0.000 claims description 24
- 239000000779 smoke Substances 0.000 claims description 20
- 230000006870 function Effects 0.000 claims description 18
- 230000015654 memory Effects 0.000 claims description 10
- 230000003111 delayed effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 238000005265 energy consumption Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention provides a range hood and a control method thereof. The control method comprises the following steps: acquiring the motor rotating speed of the range hood and acquiring the motor power of the range hood; calculating the air volume of the range hood according to the motor rotating speed and the motor power, and calculating the outlet air pressure of the range hood according to the motor rotating speed and the air volume; calculating the required outlet air pressure of the range hood according to the air volume, the outlet air pressure and a preset air volume expected value; calculating the target rotating speed of the motor according to the wind pressure at the demand outlet; and adjusting the motor according to the target rotating speed. The air quantity, the outlet air pressure, the required outlet air pressure and the target rotating speed can be calculated by obtaining the motor rotating speed and the motor power of the range hood, so that the motor rotating speed can be adjusted in real time according to the target value, the range hood can operate with stable air quantity, and the air quantity fluctuation is small.
Description
Technical Field
The invention relates to the field of range hoods, in particular to a range hood and a control method thereof.
Background
The fume exhauster is an electric appliance for purifying fume in kitchen. In modern urban residential buildings, public flues are arranged for collecting kitchen flue gas generated by each household. The range hood of each household is randomly started, so that the pressure of a common flue is complex and variable, and the constant air volume cannot be kept when the traditional range hood runs.
To above-mentioned problem, adopt amount of wind or wind pressure sensor to gather the amount of wind or the wind pressure data of smoke ventilator operation in-process among the prior art more, judge whether smoke ventilator needs to adjust the running state, however under the oil smoke environment, the sensor is very easy to be blockked up and unable normal work to influence data acquisition's accuracy and stability.
Disclosure of Invention
An object of the present invention is to provide a range hood and a control method thereof that solve at least one of the above-mentioned problems.
A further object of the present invention is to accurately adjust the air volume without the use of sensors.
It is another further object of the present invention to reduce the noise and energy consumption of a range hood.
Particularly, the invention provides a control method of a range hood, which comprises the following steps: acquiring the motor rotating speed of the range hood and acquiring the motor power of the range hood; calculating the air volume of the range hood according to the motor rotating speed and the motor power, and calculating the outlet air pressure of the range hood according to the motor rotating speed and the air volume; calculating the required outlet air pressure of the range hood according to the air volume, the outlet air pressure and a preset air volume expected value; calculating the target rotating speed of the motor according to the wind pressure at the demand outlet; and adjusting the motor according to the target rotating speed.
Optionally, the step of calculating the outlet wind pressure of the range hood according to the motor speed and the air volume comprises: judging whether the difference value of the air volume and a preset air volume expected value is larger than a preset threshold value or not; if yes, calculating the outlet air pressure of the range hood according to the rotating speed of the motor and the air quantity; if not, the motor speed and the motor power of the range hood are obtained again after the preset time is delayed.
Optionally, the motor is a dc brushless motor, and the step of obtaining the motor speed of the range hood includes: acquiring the input frequency of a motor; according to the formula
And calculating the rotating speed of the motor, wherein n is the rotating speed of the motor, f is the input frequency of the motor, p is the number of magnetic pole pairs of the motor, and s is the slip ratio of the motor.
Optionally, the step of adjusting the motor according to the target rotation speed includes: and calculating the required input frequency of the motor according to the target rotating speed, and adjusting the input frequency to the required input frequency.
Optionally, the step of calculating the air volume of the range hood according to the motor speed and the motor power comprises: calculating an air quantity Q by using a formula Q ═ G (N, N), wherein Q is the air quantity, N is the power of the motor, and G represents a corresponding function between the air quantity Q and the motor speed N and the motor power N; and the method of determining the correspondence function G includes: the method comprises the steps of testing a motor in advance, changing motor power N under different motor rotating speeds N, detecting and recording corresponding air quantity Q, and fitting the corresponding relation of the motor rotating speeds N, the motor power N and the air quantity Q to obtain a corresponding function G.
Optionally, the step of calculating the outlet wind pressure of the range hood according to the motor speed and the air volume comprises: according to formula PTCalculating the outlet wind pressure P (H, Q, n)TIn the formula, PTIs outlet wind pressure, Q is wind volume, n is motor speed, H represents outlet wind pressure PTA corresponding function between the motor rotating speed n and the air quantity Q; and the method of determining the correspondence function H includes: the motor is tested in advance, and the outlet wind pressure P is changed under different motor rotating speeds nTDetecting and recording the corresponding air quantity Q, and controlling the motor speed n and the outlet air pressure PTAnd fitting the corresponding relation of the air quantity Q to obtain a corresponding function H.
Optionally, the step of calculating the required outlet air pressure of the range hood according to the air volume, the outlet air pressure, and the preset air volume expected value includes: calculating the pressure of a common flue according to the outlet air pressure and the air quantity, wherein the common flue is communicated with an exhaust pipeline of the range hood so as to collect and discharge the smoke sucked by the range hood; and calculating the required outlet air pressure of the range hood according to the pressure of the common flue and a preset air volume expected value.
Optionally, the step of calculating the pressure of the common flue according to the outlet wind pressure and the wind volume comprises: using formulas
Calculating the pressure P 'of the public flue, wherein P' is the pressure of the public flue, xi is the resistance coefficient of the exhaust pipeline, A is the sectional area of the exhaust pipeline, and rho is the density of smoke in the exhaust pipeline; the step of calculating the wind pressure of the required outlet of the range hood according to the pressure of the public flue and the preset expected value of the wind volume comprises the following steps: using formulas
Calculating a desired outlet pressure, wherein PT1To demand outlet pressure, QsetIs a preset expected value of air volume.
Optionally, the step of estimating the target rotation speed of the motor according to the demand outlet wind pressure comprises: wind pressure P is exported with the demandT1Preset air volume expected value QsetAnd calculating to obtain the target rotating speed.
According to another aspect of the present invention, there is also provided a hood, including: the motor is used for prompting the range hood to generate airflow; a control device, comprising: a processor and a memory, the memory having stored therein a control program for implementing the control method according to any one of claims 1-9 when executed by the processor.
According to the scheme, the air quantity of the range hood can be calculated by acquiring the motor rotating speed and the motor power of the range hood, so that the outlet air pressure and the target rotating speed corresponding to the preset air quantity expected value can be calculated, and the motor is adjusted according to the target rotating speed, so that the range hood can operate at a stable air quantity, and the air quantity fluctuation is small.
Further, the scheme of the invention is different from a method utilizing an air volume or air pressure sensor, and the air volume, the outlet air pressure, the required outlet air pressure, the target rotating speed and the corresponding required input frequency can be calculated by obtaining the input frequency and the power of the motor of the range hood, so that the problem of inaccurate data acquisition caused by the failure of the sensor in an oil smoke environment can be solved, and the air volume can be accurately adjusted without using the sensor.
Furthermore, according to the scheme of the invention, for the problem that the air volume of the range hood exceeds the preset air volume expected value when the pressure of the public flue is reduced, the rotating speed of the motor can be adjusted and reduced in real time, the generation of excessive noise is reduced, and meanwhile, the energy consumption can also be reduced.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a control block diagram of a hood according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a control method of a hood according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method of a hood according to an embodiment of the present invention;
fig. 4 is a schematic view of a test platform during a preliminary test of a control method of the hood according to an embodiment of the present invention;
fig. 5 is a schematic view of a test result of a preliminary test process of a control method of a hood according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic diagram of a range hood 10 according to one embodiment of the present invention. The range hood 10 may generally include: motor 210, control device 400. The motor 210 may be a brushless dc motor 210, and is configured to enable the fan 220 to operate to generate an air flow, so that a negative pressure region is formed in a certain spatial range above the stove, and indoor oil smoke gas is sucked into the range hood 10, that is, the motor 210 is the fan 220 of the range hood 10 and drives the motor 210. The smoke exhaust ventilator 10 is connected with the public flue by an exhaust duct, and smoke sucked into the smoke exhaust ventilator 10 enters the public flue through the exhaust duct.
The control device 400 has a memory 420 and a processor 410, wherein the memory 420 stores a control program 421, and the control program 421 is executed by the processor 410 to implement the control method of the range hood 10 according to any one of the following embodiments. The processor 410 may be a Central Processing Unit (CPU), or a digital processing unit (DSP), etc. The memory 420 is used to store programs executed by the processor 410. The memory 420 may be any medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. Memory 420 may also be a combination of various memories 420. Since the control program 421 is executed by the processor 410 to implement the processes of the method embodiments described below and achieve the same technical effects, the detailed description is omitted here to avoid repetition.
The range hood 10 is selectively opened by a user and can be selectively operated at a certain gear by the user, and in the embodiment, the range hood 10 can be provided with a gear under which a corresponding preset air volume expected value is set. In other alternative embodiments, the range hood 10 may be provided with a plurality of gears, and each gear is provided with a corresponding preset air volume expected value. In actual operation, under the influence of larger pressure of the common flue, the air volume of the range hood 10 is smaller than a preset air volume expected value, so that the problem of unsmooth smoke discharge is caused; when the pressure of the common flue is small, the air volume of the range hood 10 is larger than a preset air volume expected value, excessive noise is generated in the operation process, and unnecessary energy consumption is caused.
For this reason, in the method of this embodiment, after every preset time, the input frequency and the power of the motor 210 of the range hood 10 are obtained, so as to calculate the air volume of the range hood 10, determine whether to adjust the motor rotation speed of the range hood 10 by determining the deviation degree between the air volume and the preset air volume expected value, and determine the adjusted target value.
Fig. 2 is a schematic diagram of a control method of the hood 10 according to one embodiment of the present invention. The control method may generally include:
step S202, the motor speed and the input power of the range hood 10 are acquired.
The input frequency and power of the motor 210 can be directly obtained by the control device 400. For a direct current brushless motor, the motor speed and the input frequency are in a linear relation, and the motor speed can be calculated according to the following formula:
in the equation (1), n is the motor rotation speed, f is the input frequency of the motor 210, p is the number of pole pairs of the motor 210, and s is the slip of the motor 210.
On the basis that the magnetic pole pair number p and the slip ratio s of the motor 210 are determined values, the input frequency of the motor 210 is obtained, and the motor rotating speed can be obtained through calculation according to a formula; similarly, the corresponding input frequency can be calculated according to a formula by acquiring the rotating speed of the motor.
Step S204, calculating the air volume of the range hood 10 according to the motor power, and calculating the outlet air pressure of the range hood 10 according to the motor rotating speed and the air volume;
the air volume of the range hood 10 can be calculated according to the following formula:
Q＝G(n,N) (2)
in the formula (2), Q is the air volume, N is the motor power, and G represents a corresponding function between the air volume Q and the motor speed N and the motor power N.
In the embodiment, unlike the method using the air volume or the air pressure sensor, the air volume can be calculated by obtaining the input frequency and the power of the motor 210 of the range hood 10, so that the problem of inaccurate data acquisition caused by the failure of the sensor in the oil smoke environment can be solved, and the air volume can be accurately adjusted without using the sensor.
Wherein, the corresponding function G is obtained by the preliminary test, and the determining step comprises: and respectively changing the motor power N under different motor rotating speeds N, detecting and recording corresponding air volume Q, and fitting the corresponding relation of the motor rotating speed N, the motor power N and the air volume Q to obtain a corresponding function G.
Fig. 4 is a schematic diagram of a test platform during a preliminary test of a control method of the hood 10 according to one embodiment of the present invention. Fig. 5 is a schematic diagram of a test result of a preliminary test process of a control method of the range hood 10 according to an embodiment of the present invention, in which an abscissa of the test result is an air volume of the range hood 10, a left ordinate of the test result is an outlet air pressure of the range hood 10, a right ordinate of the test result is a motor power of the range hood 10, each dotted line in the diagram, which is formed by connecting dots, is a relationship curve between the motor power and the air volume of the range hood 10 at different motor rotation speeds, and each solid line in the diagram is a relationship curve between the outlet air pressure and the air volume of the range hood 10 at different motor rotation speeds.
Specifically, the pre-test process is performed on a test platform in a standard kitchen laboratory, the test platform 300 mainly comprising: the range hood 10, the manual regulating valve 50, the frequency converter 40, the frequency converter 80, the exhaust duct 60 and the relay fan 70. Since the test process is performed at a series of different constant rotational speeds, the frequency converter 40 controlling the range hood 10 needs to be adjusted and relevant parameters set before the test. The manual regulating valve 50 is used for increasing the system impedance and reducing the air volume so as to simulate the influence of the pressure change of the common flue on the test platform; the relay fan is used for reducing system impedance and increasing air quantity, is a three-phase alternating current motor and can be adjusted steplessly from 0 to 50Hz through a frequency converter 80. The exhaust duct is also connected with a nozzle flowmeter 610, a static pressure ring 611 is arranged at the front pipe section and the rear pipe section of the nozzle flowmeter 610, the front pressure difference and the rear pressure difference can be tested through the static pressure ring 611, the air quantity of the range hood 10 can be accurately calculated, and the calculation formula (3) is as follows:
mu in the formula (3) is a nozzle flow coefficient determined by the size of a standard nozzle, A is the sectional area of an exhaust pipeline, rho is the smoke density, and delta P is the pressure difference before and after the static pressure ring 611 is measured.
On the basis of acquiring the air volume data, whether the difference value between the air volume and a preset air volume expected value is larger than a preset threshold value or not can be further judged; if not, the air volume at the moment can meet the preset use requirement, the rotating speed of the motor does not need to be adjusted, and the rotating speed of the motor and the power of the motor of the range hood 10 are obtained again after the preset time is delayed; if so, the air volume at the moment cannot meet the preset use requirement, the rotating speed of the motor needs to be adjusted, and a subsequent calculation step needs to be executed before the adjustment so as to obtain the required input frequency of the motor 210; specifically, to obtain the required input frequency, the outlet air pressure of the range hood 10, the common flue pressure, the required outlet air pressure, and the target rotation speed of the motor 210 need to be calculated.
Different from a method using an air volume or air pressure sensor, according to the scheme of this embodiment, the air volume and the outlet air pressure can be calculated by obtaining the input frequency and the power of the motor 210 of the range hood 10, and then the target rotating speed is obtained, so that the problem of inaccurate data acquisition caused by the failure of the sensor in an oil smoke environment can be avoided, and the data can be more accurately acquired to adjust the air volume.
Under the condition that the difference between the air volume of the range hood 10 and the preset air volume expected value is large, the target rotating speed and the corresponding required input frequency are obtained through calculation, and the motor 210 is adjusted according to the requirement of the target rotating speed, so that the range hood 10 can operate with stable air volume, and the air volume fluctuation is small.
For the outlet wind pressure of the range hood 10, it can be calculated according to the following formula (4) according to the motor rotation speed and the wind volume:
PT＝H(Q,n) (4)
in the formula (4), PTIs outlet wind pressure, Q is wind volume, n is motor speed, H represents outlet wind pressure PTCorresponding relation between the motor rotation speed n and the air quantity Q;
wherein the correspondence function H is also measured in advance, and the determining step includes: respectively changing outlet wind pressure P under different motor rotation speeds nTDetecting and recording corresponding air quantity Q, and making motor rotation speed n and outlet air pressure PTAnd fitting the corresponding relation of the air quantity Q to obtain a corresponding function H.
Specifically, the method for detecting the air volume and the method for adjusting the rotating speed of the motor are the same as the method for acquiring the corresponding function G; for the detection of the outlet wind pressure, in the test platform, a static pressure measuring hole 620 is further formed in the outlet pipeline part of the joint of the exhaust pipe and the test range hood and used for testing the outlet wind pressure of the test range hood.
And step S206, calculating the pressure of the public flue according to the outlet wind pressure and the wind volume.
Because the exhaust duct is connected between smoke ventilator 10's casing and public flue, the difference between smoke ventilator 10's export wind pressure and the pressure of public flue is the pressure that consumes in the exhaust duct promptly, consequently, utilize formula (5), can calculate the pressure of public flue according to export wind pressure and the pressure that consumes in the exhaust duct:
in formula (5), P' is the common flue pressure, PTThe outlet air pressure is shown, xi is the resistance coefficient of the exhaust duct, A is the sectional area of the exhaust duct, and rho is the smoke density in the exhaust duct.
Step S208, calculating the required outlet wind pressure of the range hood 10 according to the pressure of the public flue and a preset air volume expected value, and calculating the target rotating speed of the motor 210 according to the required outlet wind pressure;
the value of the required outlet air pressure of the range hood 10, which is the sum of the pressure of the common flue and the pressure consumed in the exhaust duct, can be calculated according to the following formula (6):
in the formula (6), PT1To demand outlet pressure, QsetIs a preset expected value of air volume.
The required outlet pressure for the range hood 10 can be directly calculated using the following equation (7):
the target rotation speed of the motor 210 can be calculated according to equation (3) on the basis of the known required outlet pressure and the preset expected value of the air volume.
Step S210, adjusting the motor 210 according to the target rotation speed.
The required input frequency of the motor 210 is calculated using the target rotational speed, and the input frequency of the motor 210 is adjusted to the required input frequency.
For the problem that the air quantity of the range hood 10 exceeds the preset air quantity expected value when the pressure of the common flue is reduced, the scheme of the embodiment can adjust and reduce the rotating speed of the motor in real time, reduce excessive noise and reduce energy consumption.
Fig. 3 is a flowchart of a control method of the hood 10 according to one embodiment of the present invention. The process comprises the following steps:
step S302, the user selects a gear and enters an operation state. The hood 10 enters an operating state at a preset air volume expected value.
Step S304, acquiring the input frequency and power of the motor 210 of the range hood 10;
step S306, calculating the motor rotating speed of the range hood 10;
step S308, calculating the air quantity of the range hood 10 according to the motor rotating speed and the motor power;
step S310, judging whether the difference value of the air volume and a preset air volume expected value is larger than a preset threshold value or not; if the difference value between the air volume and the preset air volume expected value is larger than the preset threshold value, executing the step S312; if the difference value between the air volume and the preset air volume expected value is not greater than the preset threshold value, the input frequency and the power of the motor 210 of the range hood 10 are obtained again after the preset time;
step S312, calculating the outlet wind pressure of the range hood 10 according to the rotating speed of the motor and the wind quantity of the range hood 10;
step S314, calculating the pressure of the common flue according to the outlet wind pressure and the wind quantity of the range hood 10;
step S316, calculating the wind pressure of a required outlet according to the pressure of the common flue and a preset expected value of wind volume;
step S318, calculating a target rotating speed according to the wind pressure of the outlet and a preset wind volume expected value;
step S320, calculating a required input frequency of the motor 210 according to the target rotation speed;
in step S322, the input frequency of the motor 210 is adjusted to the required input frequency.
According to the scheme of the embodiment, the input frequency and the input power of the motor 210 of the range hood 10 are obtained, the motor rotating speed and the air volume of the range hood 10 can be calculated, the outlet air pressure and the target rotating speed corresponding to the preset expected air volume value can be calculated, and the motor 210 is adjusted according to the target rotating speed, so that the range hood 10 can operate at a stable air volume and the air volume fluctuation is small; different from a method for measuring the air volume or the air pressure in the operating state by using an air volume or air pressure sensor, in the embodiment, the air volume, the outlet air pressure, the required outlet air pressure, the target rotating speed and the corresponding required input frequency can be calculated by obtaining the input frequency and the power of the motor 210 of the range hood 10, so that the problem of inaccurate data acquisition caused by the failure of the sensor in the oil smoke environment can be solved, and the air volume can be accurately adjusted without using the sensor. For the problem that the air quantity of the range hood 10 exceeds a preset air quantity expected value when the pressure of the common flue is reduced, the rotating speed of the motor can be adjusted and reduced in real time, excessive noise is reduced, and meanwhile, energy consumption can be reduced.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A control method of a range hood comprises the following steps:
acquiring the motor rotating speed of the range hood, and acquiring the motor power of the range hood;
calculating the air volume of the range hood according to the motor rotating speed and the motor power, and calculating the outlet air pressure of the range hood according to the motor rotating speed and the air volume;
calculating the required outlet air pressure of the range hood according to the air volume, the outlet air pressure and a preset air volume expected value;
calculating the target rotating speed of the motor according to the wind pressure of the demand outlet;
and adjusting the motor according to the target rotating speed.
2. The control method according to claim 1, wherein the step of calculating the outlet wind pressure of the hood based on the motor rotation speed and the air volume comprises:
judging whether the difference value between the air volume and the preset air volume expected value is larger than a preset threshold value or not;
if so, calculating the outlet air pressure of the range hood according to the rotating speed of the motor and the air volume;
if not, the motor speed and the motor power of the range hood are obtained again after the preset time is delayed.
3. The range hood control method of claim 1, wherein the motor is a dc brushless motor, and the step of obtaining the motor speed of the range hood comprises:
acquiring the input frequency of the motor;
according to the formula
And calculating the rotating speed n of the motor, wherein n in the formula is the rotating speed of the motor, f is the input frequency of the motor, p is the magnetic pole pair number of the motor, and s is the slip ratio of the motor.
4. The range hood control method according to claim 3, wherein the adjusting the motor according to the target rotation speed includes:
and calculating the required input frequency of the motor according to the target rotating speed, and adjusting the input frequency to the required input frequency.
5. The range hood control method according to claim 3, wherein the step of calculating the air volume of the range hood from the motor rotation speed and the motor power includes:
calculating the air quantity Q by using a formula Q (G, N), wherein Q is the air quantity, N is the power of the motor, and G represents a corresponding function between the air quantity Q and the motor speed N and the motor power N;
and the method of determining the correspondence function G includes:
the motor is tested in advance, the motor power N is changed under different motor rotating speeds N, the corresponding air quantity Q is detected and recorded, and the corresponding relation among the motor rotating speed N, the motor power N and the air quantity Q is fitted to obtain the corresponding function G.
6. The control method of the hood according to claim 5, wherein the calculating of the outlet wind pressure of the hood according to the motor rotation speed and the air volume comprises:
according to formula PTCalculating the outlet wind pressure P (H, n)TIn the formula, PTIs the outlet wind pressure, Q is the wind volume, n is the motor speed, H represents the outlet wind pressure PTA corresponding function between the motor rotating speed n and the air quantity Q;
and the method for determining the correspondence function H includes:
testing the motor in advance, and respectively changing the outlet wind pressure P under different motor rotating speeds nTDetecting and recording the corresponding air quantity Q, and controlling the motor speed n and the outlet wind pressure PTAnd fitting the corresponding relation of the air quantity Q to obtain the corresponding function H.
7. The control method of the hood according to claim 6, wherein the step of calculating the required outlet wind pressure of the hood according to the air volume, the outlet wind pressure, and a preset air volume expected value comprises:
calculating the pressure of a public flue according to the outlet air pressure and the air quantity, wherein the public flue is connected with the range hood through an exhaust pipeline so as to collect and discharge the smoke sucked by the range hood;
and calculating the required outlet air pressure of the range hood according to the pressure of the public flue and a preset air volume expected value.
8. The control method of the hood according to claim 7, wherein,
the step of calculating the pressure of the public flue according to the outlet wind pressure and the air volume comprises the following steps: using formulas
Calculating the pressure P 'of the public flue, wherein P' is the pressure of the public flue, ξ is the resistance coefficient of the exhaust duct, A is the sectional area of the exhaust duct, and ρ is the density of the smoke in the exhaust duct;
the step of calculating the required outlet wind pressure of the range hood according to the pressure of the public flue and a preset air volume expected value comprises the following steps: using formulas
Calculating the required outlet pressure, wherein PT1For said required outlet pressure, QsetAnd the preset air volume expected value is obtained.
9. The control method of the range hood according to claim 8, wherein the estimating of the target rotation speed of the motor according to the required outlet wind pressure comprises:
utilizing the wind pressure P of the demand outletT1The preset air volume expected value QsetAnd calculating to obtain the target rotating speed.
10. A range hood, comprising:
a motor for causing the range hood to generate an airflow;
a control device, comprising: a processor and a memory, the memory having stored therein a control program for implementing the control method according to any one of claims 1-9 when executed by the processor.
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| CN201910646836.1A CN112240579B (en) | 2019-07-17 | 2019-07-17 | Range hood and control method thereof |
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| CN201910646836.1A CN112240579B (en) | 2019-07-17 | 2019-07-17 | Range hood and control method thereof |
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| CN112240579B CN112240579B (en) | 2022-08-23 |
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| CN114810647A (en) * | 2022-04-25 | 2022-07-29 | 唐山同海净化设备有限公司 | Online accurate measurement method for fan air volume based on power |
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