CN112443502A - Impeller detection method in centralized smoke exhaust system of building - Google Patents
Impeller detection method in centralized smoke exhaust system of building Download PDFInfo
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- CN112443502A CN112443502A CN201910805325.XA CN201910805325A CN112443502A CN 112443502 A CN112443502 A CN 112443502A CN 201910805325 A CN201910805325 A CN 201910805325A CN 112443502 A CN112443502 A CN 112443502A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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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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Abstract
The invention relates to an impeller detection method in a centralized smoke exhaust system of a building, which is characterized by comprising the following steps: step one, a user selects shutdown after using the indoor range hood, if necessary, the indoor impeller self-check is carried out, at the moment, the angle-adjustable electric check valve is closed, the indoor motor corresponding to the indoor range hood operates in a constant rotating speed mode at a first preset rotating speed Ni, the V-phase current value, the U-phase current value and the W-phase current value of the indoor motor are collected, a value with large three-phase current deviation is selected and recorded as mi, mi is compared with fluctuation threshold values ma and mb, and in different gears of r1 times, if ma is larger than mi and smaller than mb, the indoor impeller oil stain accumulation of the corresponding indoor range hood is judged, so that the indoor impeller is eccentric and unbalanced in load. Compared with the prior art, the impeller detection method provided by the invention has the advantage that the obtained judgment conclusion is more accurate.
Description
Technical Field
The invention relates to an impeller detection method in a centralized smoke exhaust system of a building.
Background
The range hood that uses in the kitchen of house and apartment at present, most all are independent separately, do not have the relation between the range hood of different residents, the user installs by oneself and inhales oil smoke and has very big randomness, most users directly set up the discharge port of range hood at the window trompil or the wall body hole digging in kitchen, the oil smoke directly discharges from the outer wall, cause the pollution interference to upper and lower floor resident family, and can cause oil pollution to the outer wall, can also influence the whole outward appearance image of building simultaneously.
With the rapid development of economy, more and more high-rise residences pull out the ground like spring shoots after rain. In order to keep the appearance of the whole building, a centralized smoke exhaust system of the building is adopted to perform centralized smoke exhaust in a plurality of high-rise civil residences, the system comprises indoor smoke exhaust ventilators arranged in kitchens of different residents on different floors, a public flue arranged in the building and an outdoor main fan system arranged on the top layer of the building, air outlets of the indoor smoke exhaust ventilators are communicated with the public flue, and an air outlet of the public flue is communicated with an inlet of the outdoor fan system.
In recent years, an air outlet of a range hood in a user side room is communicated with a public flue through an angle-adjustable valve, an outdoor main fan system is provided with a centralized filtering system and is already applied to some finish-up building, and the outdoor main fan system carries out frequency conversion control aiming at different indoor range hood starting rates or realizes flow distribution by adjusting angles of the angle-adjustable valves of different floors; in the centralized smoke exhaust system of building, outdoor main fan system and indoor range hood often all install the impeller, therefore the grease resolution can be effectively improved, but through the use of an end time, because indoor range hood and outdoor main fan system adopt radial-flow fan vertical installation more, the general vertical installation of impeller, consequently the greasy dirt accumulation of impeller lower part will be on the large side, and the grease of separation can unanimously stop in the impeller lower part when range hood shuts down, the greasy dirt accumulation of aggravation, this time the eccentric aggravation and the unbalanced load that lead to the impeller. At present, the phenomena of eccentricity and unbalanced load of the impeller can be relieved only by periodically cleaning and maintaining the impeller in the market. Therefore, how to accurately judge whether the impeller has the phenomena of eccentricity and load imbalance is an important technology.
Disclosure of Invention
The invention aims to solve the technical problem of providing an impeller detection method in a centralized smoke exhaust system of a building, which can accurately judge whether the impeller has eccentricity and load imbalance phenomena in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for detecting impellers in a centralized smoke exhaust system of a building is disclosed, wherein the centralized smoke exhaust system of the building comprises a plurality of indoor smoke exhaust ventilators arranged in kitchens of residents on different floors, a common flue arranged in the building and an outdoor main fan system arranged on the top floor of the building; the air outlets of the indoor range hoods are communicated with a common flue through an angle-adjustable electric check valve, and the air outlet of the common flue is communicated with the inlet of the outdoor fan system; indoor fans are installed in the indoor range hoods and comprise indoor motors and indoor impellers driven to rotate by the indoor motors; the method is characterized in that: presetting an oil stain accumulation state parameter r with an initial value of 0 and an indoor impeller detection state parameter S with an initial value of 0 in each indoor range hood; the indoor range hood detects the indoor impeller through the following steps:
step one, a user selects to shut down after using the indoor range hood, and then the step two is carried out;
step two, selecting whether the self-checking of the impeller in the front chamber needs to be shut down by a user, and entering the step three if the self-checking is needed; if not, normally shutting down the indoor range hood;
step three, closing an angle-adjustable electric check valve corresponding to the outlet of the indoor oil smoke suction air outlet, and then entering step four;
step four, operating the indoor motor in the corresponding indoor oil fume suction mode at a first preset rotating speed Ni, and then entering step five;
step five, waiting for a first preset time t1, and entering step six after the rotating speed is stable;
step six, collecting the rotating speed of the indoor motor, judging whether the rotating speed of the indoor motor reaches a first preset rotating speed Ni, and if so, entering step seven; if not, returning to the step five;
step seven, collecting a V-phase current value, a U-phase current value and a W-phase current value of the indoor motor within a preset fixed time period Ti, and step twelve;
step eight, selecting the maximum value and the minimum value in the V-phase current value, and calculating the average value of the V-phase current value; selecting the maximum value and the minimum value in the U-phase current values, and calculating the average value of the U-phase current values; selecting the maximum value and the minimum value in the W-phase current values, calculating the average value of the W-phase current values, and entering the ninth step; (ii) a
Calculating the difference value between the maximum value in the V-phase current value and the average value of the V-phase current value, calculating the difference value between the average value of the V-phase current value and the minimum value in the V-phase current value, and selecting a value with higher search accuracy to be recorded as a V-phase current deviation value; calculating the difference value between the maximum value in the U-phase current value and the average value of the U-phase current value, calculating the difference value between the average value of the U-phase current value and the minimum value in the U-phase current value, and selecting a value with higher accuracy to be recorded as a U-phase current deviation value; calculating the difference value between the maximum value of the W-phase current value and the average value of the W-phase current value, calculating the difference value between the average value of the W-phase current value and the minimum value of the W-phase current value, and selecting a value with higher searching accuracy to be recorded as a W-phase current deviation value; then selecting the maximum value of the V-phase current deviation value, the U-phase current deviation value and the W-phase current deviation value, and recording the maximum value as mi; reading three-phase current fluctuation threshold values ma and mb corresponding to the indoor fan when the first preset rotating speed Ni is constantly kept running; ma is greater than mb, and ma is the minimum value of three-phase currents when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; mb is the maximum value of three-phase currents when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; then entering step ten;
or the V-phase current value, the U-phase current value and the W-phase current value are subjected to Clark conversion, and three-phase current is converted into two-phase current of a static coordinate, wherein the two-phase current are respectively as follows: an α -axis current I α and a β -axis current I β; then, carrying out park transformation, and converting the two-phase current of the stationary coordinate into the two-phase current of the rotating coordinate, wherein the two-phase current of the rotating coordinate are respectively as follows: d-axis current Id and q-axis current Iq; performing Fourier expansion on the q-axis current Iq, and reading the amplitude of a fundamental component, and recording the amplitude as mi; reading corresponding current fundamental wave amplitude thresholds ma and mb when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; ma is greater than mb, and ma is the minimum value of the q-axis fundamental wave component amplitude when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; mb is the maximum value of the q-axis fundamental wave component amplitude when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; then entering step ten;
step ten, if mb is less than mi, judging that the indoor impeller corresponding to the indoor oil fume suction is in urgent need of maintenance, sending out a maintenance notice, and then shutting down the corresponding indoor oil fume suction; if mi is less than or equal to ma, normally shutting down the corresponding indoor oil smoke absorption machine; if ma is greater than mi and less than or equal to mb, the oil stain accumulation state parameter r is r +1, and entering the eleventh step;
step eleven, judging whether r is larger than a first preset threshold value r1, if not, increasing a first gear for the gear of an indoor fan in the corresponding indoor oil fume suction device to rotate, and then returning to the step five; if so, resetting the oil stain accumulation state parameter r, and judging that the oil stain accumulation of the indoor impeller of the corresponding indoor range hood causes the eccentric and load unbalanced phenomena of the indoor impeller;
step twelve, changing the indoor unit detection state parameter S to S +1, and entering the step thirteen;
step thirteen, judging whether S is larger than a second preset threshold value S1, if so, resetting the indoor unit detection state parameter S, and sending out an early warning signal that the smoke tube is leaked or falls off and needs to be overhauled; if not, returning to the step five.
When the first step judges that the indoor impeller has eccentricity and unbalanced load, the indoor range hood enters a maintenance mode for performing pulsation maintenance on the indoor impeller, a maintenance period parameter T is preset in the indoor range hood in the maintenance mode, the initial value of T is 0, and the maintenance mode comprises the following steps:
step 4, whether T is equal to a preset maintenance period threshold value or not, if not, returning to the step 1; if yes, the corresponding indoor oil smoke suction device is normally shut down.
As an improvement, an outdoor fan is arranged in the outdoor fan system, and is provided with an outdoor motor and an outdoor impeller; when the outdoor fan system detects the outdoor impeller, the electric check valves with adjustable angles at the air outlets of all the indoor range hoods are closed, the rotating speed of the outdoor motor and the three-phase current value of the outdoor motor are collected, and the specific detection method is the same as that of the indoor impeller of the indoor range hood.
And then improving, when the outdoor impeller is judged to have eccentricity and unbalanced load, the outdoor fan system enters a maintenance mode for performing pulsation maintenance on the outdoor impeller, a maintenance period parameter T is preset in the outdoor fan system in the maintenance mode, the initial value of T is 0, and the maintenance mode comprises the following steps:
step 4, whether T is equal to a preset maintenance period threshold Ts or not, if not, returning to the step 1; if yes, the outdoor fan system is normally shut down.
Compared with the prior art, the invention has the advantages that: under the condition of utilizing adjustable angle electric check valve to close, with the operation of indoor motor according to constant rotational speed mode, through gathering indoor motor three-phase current fluctuation value or getting with undulant most direct fundamental wave amplitude as judging whether the impeller leads to the load fluctuation too big because the condition such as greasy dirt accumulation to judge whether the impeller needs clean maintenance, judge more accurately. In the improvement scheme, the impeller is positively and negatively rotated for a certain time before shutdown, so that the phenomena of eccentricity and unbalanced load caused by accumulated oil stains at the initial stage of impeller shutdown after shutdown can be greatly relieved.
Drawings
Fig. 1 is a schematic structural diagram of a centralized smoke exhaust system of a building according to an embodiment of the present invention;
fig. 2 is a flowchart of an impeller detection method in a centralized smoke exhaust system of a building according to an embodiment of the present invention.
Fig. 3 is a flowchart of an impeller detection method in a centralized smoke exhaust system of a building according to a second embodiment of the present invention.
Fig. 4 is a flowchart of the maintenance mode in the third embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example one
As shown in fig. 1, the centralized smoke exhaust system for a building includes M indoor smoke exhaust ventilators 11 and 12 … … 1M arranged in kitchens of residents on different floors, where M is a natural number; the range hood comprises a common flue 2 arranged in a building, and an outdoor main fan system 3 arranged at the top layer of the building, wherein air outlets of a plurality of indoor range hoods are communicated with the common flue through an angle-adjustable electric check valve 4, and the air outlet of the common flue is communicated with an inlet of the outdoor fan system; indoor fans and indoor impellers are arranged in the indoor range hoods, and the indoor impellers are driven to rotate by the indoor fans; presetting an oil stain accumulation state parameter r of the indoor range hood, wherein the initial value of r is 0, and detecting a state parameter S of an indoor impeller, wherein the initial value of S is 0; the indoor range hood detects the indoor impeller through the following steps, and the specific process is shown in the figure 2:
step one, a user selects to shut down after using the indoor range hood, and then the step two is carried out;
step two, selecting whether the self-checking of the impeller in the front chamber needs to be shut down by a user, and entering the step three if the self-checking is needed; if not, normally shutting down the indoor range hood;
step three, closing an angle-adjustable electric check valve corresponding to the outlet of the indoor oil smoke suction air outlet, and then entering step four;
step four, operating the indoor motor in the corresponding indoor oil fume suction mode at a first preset rotating speed Ni, and then entering step five;
step five, waiting for a first preset time t1, and entering step six after the rotating speed is stable;
step six, collecting the rotating speed of the indoor motor, judging whether the rotating speed of the indoor motor reaches a first preset rotating speed Ni, and if so, entering step seven; if not, returning to the step five;
step seven, collecting a V-phase current value, a U-phase current value and a W-phase current value of the indoor motor within a preset fixed time period Ti, and step twelve;
step eight, selecting the maximum value and the minimum value in the V-phase current value, and calculating the average value of the V-phase current value; selecting the maximum value and the minimum value in the U-phase current values, and calculating the average value of the U-phase current values; selecting the maximum value and the minimum value in the W-phase current values, calculating the average value of the W-phase current values, and entering the ninth step; (ii) a
Calculating the difference value between the maximum value in the V-phase current value and the average value of the V-phase current value, calculating the difference value between the average value of the V-phase current value and the minimum value in the V-phase current value, and selecting a value with higher search accuracy to be recorded as a V-phase current deviation value; calculating the difference value between the maximum value in the U-phase current value and the average value of the U-phase current value, calculating the difference value between the average value of the U-phase current value and the minimum value in the U-phase current value, and selecting a value with higher accuracy to be recorded as a U-phase current deviation value; calculating the difference value between the maximum value of the W-phase current value and the average value of the W-phase current value, calculating the difference value between the average value of the W-phase current value and the minimum value of the W-phase current value, and selecting a value with higher searching accuracy to be recorded as a W-phase current deviation value; then selecting the maximum value of the V-phase current deviation value, the U-phase current deviation value and the W-phase current deviation value, and recording the maximum value as mi; reading three-phase current fluctuation threshold values ma and mb corresponding to the indoor fan when the first preset rotating speed Ni is constantly kept running; ma is greater than mb, and ma is the minimum value of three-phase currents when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; mb is the maximum value of three-phase currents when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; then entering step ten;
step ten, if mb is less than mi, judging that the indoor impeller corresponding to the indoor oil fume suction is in urgent need of maintenance, sending out a maintenance notice, and then shutting down the corresponding indoor oil fume suction; if mi is less than or equal to ma, normally shutting down the corresponding indoor oil smoke absorption machine; if ma is greater than mi and less than or equal to mb, the oil stain accumulation state parameter r is r +1, and entering the eleventh step;
step eleven, judging whether r is larger than a first preset threshold value r1, if not, increasing a first gear for the gear of an indoor fan in the corresponding indoor oil fume suction device to rotate, and then returning to the step five; if so, resetting the oil stain accumulation state parameter r, and judging that the oil stain accumulation of the indoor impeller of the corresponding indoor range hood causes the eccentric and load unbalanced phenomena of the indoor impeller;
step twelve, changing the indoor unit detection state parameter S to S +1, and entering the step thirteen;
step thirteen, judging whether S is larger than a second preset threshold value S1, if so, resetting the indoor unit detection state parameter S, and sending out an early warning signal that the smoke tube is leaked or falls off and needs to be overhauled; if not, returning to the step five.
If an outdoor fan is installed in the outdoor fan system, the outdoor fan is provided with an outdoor motor and an outdoor impeller; when the outdoor fan system detects the outdoor impeller, the adjustable-angle electric check valves at the air outlets of all the indoor range hoods need to be closed, the rotating speed of the outdoor motor and the three-phase current value of the outdoor motor are collected, the specific detection method is the same as the method for detecting the indoor impeller by the indoor range hoods, and the specific detection method is the same as the method for detecting the indoor impeller by the indoor range hoods.
Example two
Different from the first embodiment, the ninth step is: and carrying out Clark conversion on the V-phase current value, the U-phase current value and the W-phase current value, and converting the three-phase current into the two-phase current of a static coordinate, wherein the Clark conversion is respectively as follows: an α -axis current I α and a β -axis current I β; then, carrying out park transformation, and converting the two-phase current of the stationary coordinate into the two-phase current of the rotating coordinate, wherein the two-phase current of the rotating coordinate are respectively as follows: d-axis current Id and q-axis current Iq; performing Fourier expansion on the q-axis current Iq, and reading the amplitude of a fundamental component, and recording the amplitude as mi; reading corresponding current fundamental wave amplitude thresholds ma and mb when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; ma is greater than mb, and ma is the minimum value of the q-axis fundamental wave component amplitude when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; mb is the maximum value of the q-axis fundamental wave component amplitude when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; then entering step ten; as shown in fig. 3.
EXAMPLE III
Different from the first embodiment, when it is determined in the eleventh step that the eccentricity and the load imbalance of the indoor impeller occur, the indoor range hood enters a maintenance mode for performing pulsation maintenance on the indoor impeller, where in the maintenance mode, a preset maintenance period parameter T is set in the indoor range hood, and an initial value of T is 0, and the maintenance mode includes the following steps, as shown in fig. 4:
step 4, whether T is equal to a preset maintenance period threshold Ts or not, if not, returning to the step 1; if yes, the corresponding indoor oil smoke suction device is normally shut down.
Similarly, when the outdoor impeller has eccentricity and unbalanced load, the outdoor impeller is also subjected to pulsation maintenance by the same method.
Claims (4)
1. A method for detecting impellers in a centralized smoke exhaust system of a building is disclosed, wherein the centralized smoke exhaust system of the building comprises a plurality of indoor smoke exhaust ventilators arranged in kitchens of residents on different floors, a common flue arranged in the building and an outdoor main fan system arranged on the top floor of the building; the air outlets of the indoor range hoods are communicated with a common flue through an angle-adjustable electric check valve, and the air outlet of the common flue is communicated with the inlet of the outdoor fan system; indoor fans are installed in the indoor range hoods and comprise indoor motors and indoor impellers driven to rotate by the indoor motors; the method is characterized in that: presetting an oil stain accumulation state parameter r with an initial value of 0 and an indoor impeller detection state parameter S with an initial value of 0 in each indoor range hood; the indoor range hood detects the indoor impeller through the following steps:
step one, a user selects to shut down after using the indoor range hood, and then the step two is carried out;
step two, selecting whether the self-checking of the impeller in the front chamber needs to be shut down by a user, and entering the step three if the self-checking is needed; if not, normally shutting down the indoor range hood;
step three, closing an angle-adjustable electric check valve corresponding to the outlet of the indoor oil smoke suction air outlet, and then entering step four;
step four, operating the indoor motor in the corresponding indoor oil fume suction mode at a first preset rotating speed Ni, and then entering step five;
step five, waiting for a first preset time t1, and entering step six after the rotating speed is stable;
step six, collecting the rotating speed of the indoor motor, judging whether the rotating speed of the indoor motor reaches a first preset rotating speed Ni, and if so, entering step seven; if not, returning to the step five;
step seven, collecting a V-phase current value, a U-phase current value and a W-phase current value of the indoor motor within a preset fixed time period Ti, and step twelve;
step eight, selecting the maximum value and the minimum value in the V-phase current value, and calculating the average value of the V-phase current value; selecting the maximum value and the minimum value in the U-phase current values, and calculating the average value of the U-phase current values; selecting the maximum value and the minimum value in the W-phase current values, calculating the average value of the W-phase current values, and entering the ninth step; (ii) a
Calculating the difference value between the maximum value in the V-phase current value and the average value of the V-phase current value, calculating the difference value between the average value of the V-phase current value and the minimum value in the V-phase current value, and selecting a value with higher search accuracy to be recorded as a V-phase current deviation value; calculating the difference value between the maximum value in the U-phase current value and the average value of the U-phase current value, calculating the difference value between the average value of the U-phase current value and the minimum value in the U-phase current value, and selecting a value with higher accuracy to be recorded as a U-phase current deviation value; calculating the difference value between the maximum value of the W-phase current value and the average value of the W-phase current value, calculating the difference value between the average value of the W-phase current value and the minimum value of the W-phase current value, and selecting a value with higher searching accuracy to be recorded as a W-phase current deviation value; then selecting the maximum value of the V-phase current deviation value, the U-phase current deviation value and the W-phase current deviation value, and recording the maximum value as mi; reading three-phase current fluctuation threshold values ma and mb corresponding to the indoor fan when the first preset rotating speed Ni is constantly kept running; ma is greater than mb, and ma is the minimum value of three-phase currents when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; mb is the maximum value of three-phase currents when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; then entering step ten;
or the V-phase current value, the U-phase current value and the W-phase current value are subjected to Clark conversion, and three-phase current is converted into two-phase current of a static coordinate, wherein the two-phase current are respectively as follows: an α -axis current I α and a β -axis current I β; then, carrying out park transformation, and converting the two-phase current of the stationary coordinate into the two-phase current of the rotating coordinate, wherein the two-phase current of the rotating coordinate are respectively as follows: d-axis current Id and q-axis current Iq; performing Fourier expansion on the q-axis current Iq, and reading the amplitude of a fundamental component, and recording the amplitude as mi; reading corresponding current fundamental wave amplitude thresholds ma and mb when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; ma is greater than mb, and ma is the minimum value of the q-axis fundamental wave component amplitude when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; mb is the maximum value of the q-axis fundamental wave component amplitude when the corresponding indoor fan constantly keeps the first preset rotating speed Ni to operate; then entering step ten;
step ten, if mb is less than mi, judging that the indoor impeller corresponding to the indoor oil fume suction is in urgent need of maintenance, sending out a maintenance notice, and then shutting down the corresponding indoor oil fume suction; if mi is less than or equal to ma, normally shutting down the corresponding indoor oil smoke absorption machine; if ma is greater than mi and less than or equal to mb, the oil stain accumulation state parameter r is r +1, and entering the eleventh step;
step eleven, judging whether r is larger than a first preset threshold value r1, if not, increasing a first gear for the gear of an indoor fan in the corresponding indoor oil fume suction device to rotate, and then returning to the step five; if so, resetting the oil stain accumulation state parameter r, and judging that the oil stain accumulation of the indoor impeller of the corresponding indoor range hood causes the eccentric and load unbalanced phenomena of the indoor impeller;
step twelve, changing the indoor unit detection state parameter S to S +1, and entering the step thirteen;
step thirteen, judging whether S is larger than a second preset threshold value S1, if so, resetting the indoor unit detection state parameter S, and sending out an early warning signal that the smoke tube is leaked or falls off and needs to be overhauled; if not, returning to the step five.
2. The impeller detection method in the centralized building smoke exhaust system according to claim 1, wherein the impeller detection method comprises the following steps: when the first step judges that the indoor impeller has eccentricity and unbalanced load, the indoor range hood enters a maintenance mode for performing pulsation maintenance on the indoor impeller, a maintenance period parameter T is preset in the indoor range hood in the maintenance mode, the initial value of T is 0, and the maintenance mode comprises the following steps:
step 1, the indoor impeller rotates forwards for a second preset time t2 in a second preset gear Ts, then stops for a third preset time t3, and the step 2 is started;
step 2, the indoor impeller rotates reversely for a fourth preset time t4 at a second preset gear Ts, then stops for a third preset time t3, and the step 3 is started;
step 3, entering a step 4 when the maintenance period parameter T is T + 1;
step 4, whether T is equal to a preset maintenance period threshold value or not, if not, returning to the step 1; if yes, the corresponding indoor oil smoke suction device is normally shut down.
3. The impeller detection method in the centralized building smoke exhaust system according to claim 1, wherein the impeller detection method comprises the following steps: an outdoor fan is arranged in the outdoor fan system and is provided with an outdoor motor and an outdoor impeller; when the outdoor fan system detects the outdoor impeller, the electric check valves with adjustable angles at the air outlets of all the indoor range hoods are closed, the rotating speed of the outdoor motor and the three-phase current value of the outdoor motor are collected, and the specific detection method is the same as that of the indoor impeller of the indoor range hood.
4. The impeller detection method in the centralized building smoke exhaust system according to claim 3, wherein the impeller detection method comprises the following steps: when the outdoor impeller is judged to be eccentric and unbalanced in load, the outdoor fan system enters a maintenance mode for performing pulsation maintenance on the outdoor impeller, a maintenance period parameter T is preset in the outdoor fan system in the maintenance mode, the initial value of T is 0, and the maintenance mode comprises the following steps:
step 1, the outdoor impeller rotates forwards for a second preset time t2 at a second preset gear Ts, then stops for a third preset time t3, and the step 2 is executed;
step 2, the outdoor impeller rotates reversely for a fourth preset time t4 at a second preset gear Ts, then stops for a third preset time t3, and the step 3 is started;
step 3, entering a step 4 when the maintenance period parameter T is T + 1;
step 4, whether T is equal to a preset maintenance period threshold Ts or not, if not, returning to the step 1; if yes, the outdoor fan system is normally shut down.
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| Publication number | Priority date | Publication date | Assignee | Title |
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