CN110594809A - Device and method for monitoring backflow and leakage of lampblack purification device - Google Patents
Device and method for monitoring backflow and leakage of lampblack purification device Download PDFInfo
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- CN110594809A CN110594809A CN201910778500.0A CN201910778500A CN110594809A CN 110594809 A CN110594809 A CN 110594809A CN 201910778500 A CN201910778500 A CN 201910778500A CN 110594809 A CN110594809 A CN 110594809A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
Abstract
The invention discloses a device for monitoring backflow and leakage of lampblack of a lampblack purification device, which is characterized in that: including first sensor, second sensor, the third sensor that is used for detecting oil smoke concentration to and the controller of being connected with first sensor, second sensor, third sensor electricity respectively, first sensor sets up in smoke purification device's export flue, the second sensor sets up in the inside oil smoke passageway of range hood, the third sensor sets up in smoke purification device's export flue top. Also discloses a monitoring method of the device for monitoring the backflow and leakage of the lampblack purification device. Compared with the prior art, the invention has the advantages that: whether the outlet flue runs the smoke or not is judged through a sensor arranged outside the outlet flue, and the backflow of the oil smoke from the public flue or the indoor smoke is distinguished through the difference value of the sensors arranged inside the range hood and in the outlet flue at the same moment, so that the range hood is convenient and accurate.
Description
Technical Field
The invention relates to an oil fume purification device, in particular to an oil fume backflow and leakage monitoring device of the oil fume purification device and a monitoring method of the monitoring device.
Background
The range hood has become one of the indispensable kitchen household electrical appliances in modern families. The common range hood comprises a fume collecting hood, a fan cover, a fan system arranged in the fan cover and an outlet flue connecting an air outlet of the fan system with a common flue. When the outlet flue is arranged in a public flue, the situations of oil smoke backflow and the like often occur when the range hood is not started, oil smoke leakage (smoke leakage) of a flue system not only pollutes indoor environmental sanitation, but also seriously influences the body health of residents, and oil dirt of the range hood is multiplied, so that the machine disassembling and cleaning times are increased. At present, the problem of smoke leakage of a flue system at the side of a user is mostly caused by backward flowing of oil smoke or leakage of oil smoke at an outlet flue.
Aiming at the backward flow of oil smoke, the following methods are mainly adopted at present:
1) at present, a check valve is mostly installed, and the check valve generally closes an air port by means of gravity or electric power, so that oil smoke is prevented from flowing backwards into a user side; however, most valve plates are easy to stick oil dirt, and the switch is not in place; the check valves are provided with a circular seam or a middle seam, and the sealing effect is poor; the total air volume of the public flue of the high-rise residence is increased, and the check valve plate is easily pressed open by wind power.
2) Adopt to increase automatic potential device and make it possess the function of flowing backward in reverse, automatic potential device is according to the resistance change of air outlet, and intelligent regulation inverter motor's operating parameter changes the static pressure to guarantee good grease proofing cigarette effect of flowing backward: the automatic voltage transformation device of the range hood disclosed in the Chinese patent with the application number of 201811336391.9 comprises a key controller, a variable frequency driver and a variable frequency motor, wherein the key controller is connected with the variable frequency driver, the variable frequency driver is connected with the variable frequency motor, and the key controller is used for sending set operation parameters to the variable frequency driver so that the variable frequency driver drives the variable frequency motor according to the set operation parameters; the variable frequency driver is used for acquiring real-time operation parameters of the variable frequency motor, and adjusting the real-time operation parameters of the variable frequency motor through the difference value of the real-time operation parameters and the set operation parameters in the air outlet resistance change process; the variable frequency motor is used for operating according to the adjusted real-time operating parameters so as to change the static pressure.
However, the method of the automatic pressure changing device ignores the influence of smoke leakage in the outlet flue, and if the smoke leakage occurs in the outlet flue, the pressure is changed, so that the method generates misjudgment.
3) Install rotatory fan in the flue, the fan drives microgenerator and produces the electric current when the oil smoke flows backward to whether monitoring oil smoke flows backward: the range hood with the backflow prevention function disclosed in the Chinese patent with the application number of 201710236445.3 comprises a range hood main body with a check valve, a main controller, a control panel and a main turbofan motor, wherein a rotary fan blade is arranged at the check valve, a micro generator is fixed at the center of the rotary fan blade and connected with the main controller, the main controller controls the operation of the main motor, when oil smoke flows backwards, an impeller can rotate reversely to generate induced current and feed the induced current back to the main controller, and the main controller starts the motor to operate in a selected mode, so that the oil smoke in a public flue is intercepted outside, and the backflow prevention purpose is realized.
However, the installation of the rotating blades can increase the resistance in the outlet flue, which affects the smoke exhaust effect of the range hood, and meanwhile, the method ignores the influence of the smoke leakage in the outlet flue on the range hood.
4) Install smoke concentration sensor in the cigarette machine, judge whether the increase of sensor feedback signal is greater than the default with the ratio of time interval in the time interval, if, then judge that the oil smoke flows backward, open the lampblack absorber and discharge fume: the range hood disclosed in the chinese patent application No. 201721265985.6 comprises an indoor flue, a control device and a fan, wherein a detection device connected with the control device is arranged in the indoor flue, the detection device comprises a flow detection unit and/or a concentration detection unit, the flow detection unit is used for detecting the airflow flow in the indoor flue, the concentration detection unit is used for detecting the oil smoke concentration in the indoor flue, and the control device is used for controlling the fan according to the detection result of the detection device when the fan is in a shutdown state.
However, the method for installing the smoke concentration sensor in the range hood also ignores the problem that the damaged smoke flue of the outlet flue can affect the smoke concentration sensor.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a device for monitoring backflow and leakage of oil smoke of an oil smoke purifying device, which can automatically monitor whether the oil smoke flows backward and the oil smoke leaks, so as to realize backflow prevention.
The second technical problem to be solved by the present invention is to provide a monitoring method of the above monitoring device.
The technical scheme adopted by the invention for solving the first technical problem is as follows: the utility model provides a monitoring devices of oil smoke backward flow and leakage of oil smoke purifier which characterized in that: including first sensor, second sensor, the third sensor that is used for detecting oil smoke concentration to and the controller of being connected with first sensor, second sensor, third sensor electricity respectively, first sensor sets up in smoke purification device's export flue, the second sensor sets up in the inside oil smoke passageway of range hood, the third sensor sets up in smoke purification device's export flue top.
In order to ensure that the oil smoke leakage condition of the whole outlet flue is detected as far as possible, the outlet flue comprises an air outlet cover arranged at the outlet of the range hood, an outlet smoke pipe and a check valve, one end of the outlet smoke pipe is connected with the air outlet cover, the other end of the outlet smoke pipe is used for being connected with the public flue, the check valve is used for being arranged at the joint of the outlet smoke pipe and the public flue, and the third sensor is arranged above the middle of the central line of the outlet smoke pipe.
The first technical solution adopted by the present invention to solve the second technical problem is: the monitoring method of the device for monitoring the backflow and leakage of the lampblack purification device is characterized in that the range hood is in a working state and comprises a fan and is characterized in that: the method comprises the following steps:
1) starting a smoke monitoring function, wherein the first sensor, the second sensor and the third sensor continuously detect the oil smoke concentration at corresponding positions;
2) in a first time interval delta t, the increment of the feedback signal of the second sensor is delta Y2, the increment of the feedback signal of the third sensor is delta Y3, the controller judges whether the difference delta Y is delta Y2-delta Y3 in a preset range, if yes, the step 3 is carried out, if not, the controller judges that the smoke runs in the outlet flue, and a warning signal of the smoke runs in the outlet flue is sent;
3) in a second time interval delta T ', the increment of the feedback signal of the first sensor is delta Y1', the increment of the feedback signal of the second sensor is delta Y2 ', the controller judges whether the difference delta Y' ═ delta Y1 '— delta Y2' is greater than a preset value, if yes, the oil smoke is judged to be back-filled, the fan is started, the fan is stopped after the time of T1 operation, and the difference delta Y '═ delta Y1' — delta Y2 'of the feedback signal of the first sensor and the second sensor is continuously judged to be greater than the preset value in the second time interval delta T', and the steps are repeated, and when the repeated fault-tolerant times reach n1 times, the signal of the oil smoke back-filled is sent; if not, the oil smoke is judged not to flow backwards, and the smoke does not leak from the outlet flue.
The second technical solution adopted by the present invention to solve the second technical problem is: the monitoring method of the device for monitoring the backflow and leakage of the lampblack purification device is characterized in that the range hood is in a non-working state and comprises a fan and is characterized in that: the method comprises the following steps:
1) starting a smoke monitoring function, wherein the first sensor, the second sensor and the third sensor continuously detect the oil smoke concentration at corresponding positions;
2) the controller judges whether the three sensors detect oil smoke signals or not, if so, the step 3 is carried out, and if not, no oil smoke is generated indoors and the oil smoke does not flow backwards;
3) during a third time interval Δ t ", the first sensor feedback signal is increased by Δ Y1", the second sensor feedback signal is increased by Δ Y2 ", the controller determines whether Δ Y1" is greater than Δ Y2 ", if yes, step 3.1) is entered, and if not, step 3.2) is entered;
3.1) in a fourth time interval delta T ', the increment of the second sensor feedback signal is delta Y2', the increment of the third sensor feedback signal is delta Y3 ', the controller judges whether delta Y2' is greater than delta Y3 ', if yes, the oil smoke is judged to flow backwards, no smoke is leaked from an outlet flue, a fan is started to run to the highest gear, the fan is stopped after running for T2 time, the judgment is continued in the fourth time interval delta T', whether the increment of the second sensor feedback signal delta Y2 'is greater than the increment of the third sensor feedback signal Y3', and the steps are repeated, and when the oil smoke is judged to flow backwards, the fault-tolerant times that no smoke is leaked from the outlet flue reach n2 times, the oil smoke is sent and a signal which needs to be overhauled; if not, judging that the oil smoke flows backwards and the outlet flue leaks the smoke, and sending a warning signal that the oil smoke flows backwards and the outlet flue leaks the smoke;
3.2) in a fifth time interval delta T ', the increment of the first sensor feedback signal is delta Y1', the increment of the third sensor feedback signal is delta Y2 ', the controller judges whether delta Y1' is greater than delta Y3 ', if so, the smoke is judged to come from the indoor, the fan is started to the highest gear and is stopped after being operated for T3 time, then the fifth time interval delta T' is continuously judged, the increment delta Y1 'of the first sensor feedback signal is greater than the increment delta Y3' of the third sensor feedback signal, and the steps are repeated, and when the fault-tolerant times that the smoke does not run out of the smoke in the outlet flue is judged to come from the indoor and reach n3 times, the warning signal that the smoke comes from the indoor is sent; if not, the smoke is judged to come from the indoor space and the smoke runs from the outlet flue, and a warning signal that the smoke comes from the indoor space and the smoke runs from the outlet flue is sent.
Compared with the prior art, the invention has the advantages that: the sensors are arranged in or outside the outlet flue and the range hood, whether the oil smoke flows backwards or leaks from the outlet flue is intelligently distinguished according to the oil smoke concentration signals detected by the sensors, whether the outlet flue runs the oil smoke is judged by the sensor arranged outside the outlet flue, and whether the oil smoke flows backwards from the public flue or comes from the room is distinguished by the difference value of the sensors arranged in the range hood and the outlet flue at the same moment, so that the range hood is convenient and accurate.
Drawings
Fig. 1 is a schematic view of an oil smoke purifying apparatus according to an embodiment of the present invention;
fig. 2 is a monitoring flow chart of the monitoring device in the working process of the range hood according to the embodiment of the invention;
fig. 3 is a monitoring flow chart of the monitoring device of the embodiment of the invention when the range hood does not work.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Referring to fig. 1, a lampblack purification device comprises a range hood 1 and an outlet flue 2, wherein the outlet flue 2 comprises an air outlet cover 21 connected with an air outlet of the range hood 1, an outlet smoke tube 22 and a check valve 23, two ends of the outlet smoke tube 22 are respectively connected with the air outlet cover 21 and a common flue 3, and the check valve 23 is arranged at the connection position of the outlet smoke tube 22 and the common flue 3. The range hood 1 further includes a housing 11 and a fan 12 disposed in the housing 11.
The monitoring device comprises a first sensor 51 arranged in the outlet smoke pipe 22, a second sensor 52 arranged in the smoke passage in the shell 11, a third sensor 53 arranged outside the outlet smoke pipe 22 and a controller 54, wherein the first sensor 51, the second sensor 52 and the third sensor 53 are all electrically connected to the controller 54. Because the oil smoke moves upwards, in order to take account of the length of the whole outlet smoke tube 22, the third sensor 53 is installed 150 mm-200 mm above the center line of the outlet smoke tube 22 in order to better monitor the oil smoke outside the outlet flue 2, and the user can also set the installation height according to the installation condition of the range hood. The three sensors are used for detecting the oil smoke concentration of corresponding positions and can be oil smoke sensors, infrared sensors or ultrasonic oil smoke sensors and the like.
The controller 54 may be a main controller of the range hood 1, or may be an independent control device. The controller 54 can receive the signals fed back by the first sensor 51, the second sensor 52 and the third sensor 53 to determine whether the range hood has smoke flowing backward and whether the outlet flue 2 has smoke leakage (i.e. whether smoke leakage exists).
An active monitoring function key can be arranged on the range hood 1 and can be marked by an early warning icon, and the smoke monitoring is started when the key is pressed down; if the smoke monitoring function does not need to be started, the key is pressed again, and the icon is in a non-lighting state.
Referring to fig. 2, when the range hood is in the working state, the monitoring method of the monitoring device comprises the following steps:
1) starting a smoke monitoring function, and continuously detecting the oil smoke concentration at corresponding positions by using a first sensor 51, a second sensor 52 and a third sensor 53;
2) in a first time interval delta t, the increment of the feedback signal of the second sensor 52 is delta Y2, the increment of the feedback signal of the third sensor 53 is delta Y3, the controller 54 judges whether the difference delta Y is delta Y2-delta Y3 in a preset range, if yes, the step 3 is carried out, if not, the result is judged that the smoke runs in the outlet flue 2, and a warning signal of the smoke runs in the outlet flue 2 is sent to a user or a maintenance person;
3) in a second time interval Δ T ', the increase of the feedback signal of the first sensor 51 is Δ Y1', the increase of the feedback signal of the second sensor 52 is Δ Y2 ', the controller 54 determines whether the difference Δ Y' ═ Δ Y1 '— Δ Y2' is greater than a preset value, if yes, determines that the lampblack is back-filled, starts the fan 12, stops after the time of T1 operation, continues to determine whether the difference Δ Y '═ Δ Y1' — Δ Y2 'of the feedback signals of the first sensor 51 and the second sensor 52 in the second time interval Δ T' is greater than a preset value, and repeats the steps, and when the number of repeated fault tolerance times reaches n1 times, sends a signal of lampblack back-filling to a user or a maintenance person; if not, the oil smoke is judged not to flow backwards, and the smoke does not leak from the outlet flue.
The predetermined range or value can be obtained in advance through a plurality of experiments.
Referring to fig. 3, when the range hood is in the non-operating state, the monitoring method of the monitoring device comprises the following steps:
1) starting a smoke monitoring function, and continuously detecting the oil smoke concentration at corresponding positions by using a first sensor 51, a second sensor 52 and a third sensor 53;
2) the controller 54 judges whether the three sensors detect the oil smoke signals, if so, the step 3 is carried out, and if not, no oil smoke is generated indoors and the oil smoke does not flow backwards;
3) in a third time interval Δ t ", the feedback signal of the first sensor 51 is increased by Δ Y1", the feedback signal of the second sensor 52 is increased by Δ Y2 ", and the controller 54 judges whether Δ Y1" is greater than Δ Y2 ", if yes, step 3.1) is performed, and if no, step 3.2) is performed;
3.1) in a fourth time interval delta T ', the increase of the feedback signal of the second sensor 52 is delta Y2', the increase of the feedback signal of the third sensor 53 is delta Y3 ', the controller 54 judges whether delta Y2' is greater than delta Y3 ', if so, the oil smoke is judged to be back-filled, the outlet flue 2 does not run the smoke, the fan 12 is started to run to the highest gear, the fan is stopped after running for T2 time, the judgment is continued in the fourth time interval delta T', whether the increase of the feedback signal of the second sensor 52 delta Y2 'is greater than the increase of the feedback signal of the third sensor 53 delta Y3', and the steps are repeated, and when the oil smoke is judged to be back-filled, the fault-tolerant times that the outlet flue 2 does not run the smoke reach n2 times, the oil smoke is sent to the back-filled and the signal that the user needs to overhaul is sent to the user or the maintenance personnel; if not, judging that the oil smoke flows backwards and the outlet flue 2 leaks the smoke, and sending a warning signal that the oil smoke flows backwards and the outlet flue 2 leaks the smoke to a user or a maintenance worker;
3.2) in a fifth time interval delta T ', the increment of the feedback signal of the first sensor 51 is delta Y1', the increment of the feedback signal of the third sensor 53 is delta Y3 ', the controller 54 judges whether delta Y1' is larger than delta Y3 ', if so, the smoke is judged to come from the indoor space, the fan 12 is started to the highest gear, the operation is stopped after T3 time, then the fifth time interval delta T' is continuously judged, whether the increment of the feedback signal of the first sensor 51 delta Y1 'is larger than the increment of the feedback signal of the third sensor 53 delta Y3', and the operation is repeated, and when the smoke is judged to come from the indoor space, the fault-tolerant times that no smoke runs in the outlet flue 2 reach n3 times, the warning signal that the smoke comes from the indoor space is sent to a user or a maintenance person; if not, the smoke is judged to come from the indoor space and the smoke runs out from the outlet flue 2, and a warning signal that the smoke comes from the indoor space and the smoke runs out from the outlet flue 2 is sent to a user or a maintenance worker.
Optionally, each time interval and the range hood operation time T1, T2, and T3 may be set by the user. Similarly, the fault tolerance times can be set to 3 times, and the user can set the fault tolerance times by himself.
Claims (4)
1. The utility model provides a monitoring devices of oil smoke backward flow and leakage of oil smoke purifier which characterized in that: including first sensor (51), second sensor (52), third sensor (53) that are used for detecting oil smoke concentration to and controller (54) of being connected with first sensor (51), second sensor (52), third sensor (53) electricity respectively, first sensor (51) set up in oil smoke purifier's export flue (2), second sensor (52) set up in range hood (1) inside oil smoke passageway, third sensor (53) set up in oil smoke purifier's export flue (2) top.
2. The lampblack reverse flow and leakage monitoring device of the lampblack purification device according to claim 1, characterized in that: the outlet flue (2) comprises an air outlet cover (21), an outlet smoke tube (22) and a check valve (23), wherein the air outlet cover (21), the outlet smoke tube (22) and the check valve (23) are arranged at an outlet of the range hood (1), one end of the outlet smoke tube (22) is connected with the air outlet cover (21), the other end of the outlet smoke tube is used for being connected with the public flue (3), the check valve (23) is used for being arranged at the joint of the outlet smoke tube (22) and the public flue (3), and the third sensor (53) is arranged above the middle of the central line of the outlet smoke tube (22).
3. A monitoring method of a device for monitoring backflow and leakage of lampblack of a lampblack purification device as claimed in claim 1 or 2, wherein the range hood (1) is in an operating state, the range hood (1) comprises a fan (12), and the method is characterized in that: the method comprises the following steps:
1) starting a smoke monitoring function, wherein the first sensor (51), the second sensor (52) and the third sensor (53) continuously detect the oil smoke concentration at corresponding positions;
2) in a first time interval delta t, the increment of a feedback signal of the second sensor (52) is delta Y2, the increment of a feedback signal of the third sensor (53) is delta Y3, the controller (54) judges whether a difference delta Y is delta Y2-delta Y3 within a preset range, if yes, the step 3 is carried out, if not, the judgment is that smoke runs out of the outlet flue (2), and a warning signal of the smoke running out of the outlet flue (2) is sent;
3) in a second time interval delta T ', the increase of the feedback signal of the first sensor (51) is delta Y1', the increase of the feedback signal of the second sensor (52) is delta Y2 ', the controller (54) judges whether the difference delta Y' — delta Y1 '-delta Y2' is greater than a preset value, if yes, the oil smoke backflow is judged, the fan (12) is started, the fan is stopped after the time T1 is operated, and in the second time interval delta T 'after the continuous judgment, whether the difference delta Y' — delta Y1 '-delta Y2' of the feedback signal of the first sensor (51) and the second sensor (52) is greater than the preset value is judged, and the steps are repeated, and when the repeated fault tolerance times reach n1 times, the oil smoke backflow signal is sent; if not, the oil smoke is judged not to flow backwards, and the smoke does not leak from the outlet flue.
4. A monitoring method of a device for monitoring backflow and leakage of lampblack of a lampblack purification device as claimed in claim 1 or 2, wherein the range hood (1) is in a non-operating state, the range hood (1) comprises a fan (12), and the method is characterized in that: the method comprises the following steps:
1) starting a smoke monitoring function, wherein the first sensor (51), the second sensor (52) and the third sensor (53) continuously detect the oil smoke concentration at corresponding positions;
2) the controller (54) judges whether the three sensors detect oil smoke signals or not, if so, the step 3 is carried out, and if not, no oil smoke is generated indoors and the oil smoke does not flow backwards;
3) in a third time interval Δ t ", the increase of the feedback signal of the first sensor (51) is Δ Y1", the increase of the feedback signal of the second sensor (52) is Δ Y2 ", the controller (54) judges whether Δ Y1" is greater than Δ Y2 ", if yes, step 3.1 is entered, and if not, step 3.2 is entered);
3.1) in a fourth time interval delta T ', the increase of the feedback signal of the second sensor (52) is delta Y2', the increase of the feedback signal of the third sensor (53) is delta Y3 ', the controller (54) judges whether delta Y2' is greater than delta Y3 ', if so, the oil smoke backflow is judged, the outlet flue (2) does not leak the smoke, the fan (12) is started to operate to the highest gear, the fan stops after operating for T2 time, the oil smoke backflow is continuously judged in the fourth time interval delta T', whether the increase of the feedback signal delta Y2 'of the second sensor (52) is greater than the increase of the feedback signal delta Y3', the oil smoke backflow is repeated, and when the oil smoke backflow is judged, the fault-tolerant number of the outlet flue (2) not leaking the smoke reaches n2 times, the oil smoke backflow and a signal needing to be overhauled are sent; if not, judging that the oil smoke flows backwards and the outlet flue (2) runs the smoke, and sending a warning signal that the oil smoke flows backwards and the outlet flue (2) runs the smoke;
3.2) in a fifth time interval delta T ', the increase of the feedback signal of the first sensor (51) is delta Y1 ', the increase of the feedback signal of the third sensor (53) is delta Y2 ', the controller (54) judges whether delta Y1 ' is larger than delta Y3 ', if so, the smoke is judged to come from the room, the fan (12) is started to the highest gear, the operation is stopped after T3 time, then the fifth time interval delta T ' is continuously judged, whether the increase of the feedback signal of the first sensor (51) is larger than the increase of the feedback signal of the third sensor (53) delta Y3 ' or not is judged, and the operation is repeated, and when the smoke is judged to come from the room, the fault tolerance frequency of no smoke leakage of the smoke outlet (2) reaches 3 times, the smoke is sent to the warning signal from the room; if not, the smoke is judged to come from the indoor space and the outlet flue (2) runs the smoke, and a warning signal that the smoke comes from the indoor space and the outlet flue (2) runs the smoke is sent.
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| CN201910778500.0A CN110594809B (en) | 2019-08-22 | 2019-08-22 | Method for monitoring backflow and leakage of oil smoke purification device |
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| CN111006278A (en) * | 2020-01-03 | 2020-04-14 | 宁波方太厨具有限公司 | Oil fume purification device and oil fume leakage monitoring method thereof |
| CN111043638A (en) * | 2020-01-03 | 2020-04-21 | 宁波方太厨具有限公司 | Range hood and fan rotating speed deviation control method thereof |
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| CN108980474A (en) * | 2018-06-28 | 2018-12-11 | 郑州拓华仪器有限公司 | A kind of leakage-preventing gas pipeline |
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| CN111006278A (en) * | 2020-01-03 | 2020-04-14 | 宁波方太厨具有限公司 | Oil fume purification device and oil fume leakage monitoring method thereof |
| CN111043638A (en) * | 2020-01-03 | 2020-04-21 | 宁波方太厨具有限公司 | Range hood and fan rotating speed deviation control method thereof |
| CN111006278B (en) * | 2020-01-03 | 2021-08-20 | 宁波方太厨具有限公司 | Oil fume purification device and oil fume leakage monitoring method thereof |
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