CN113357676A - Method for estimating remaining service time of filter screen in centralized smoke exhaust system of building - Google Patents
Method for estimating remaining service time of filter screen in centralized smoke exhaust system of building Download PDFInfo
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- CN113357676A CN113357676A CN202010134043.4A CN202010134043A CN113357676A CN 113357676 A CN113357676 A CN 113357676A CN 202010134043 A CN202010134043 A CN 202010134043A CN 113357676 A CN113357676 A CN 113357676A
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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
- F24C15/2035—Arrangement or mounting of filters
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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
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
Abstract
The invention relates to a method for estimating the residual service life of a filter screen in a centralized smoke exhaust system of a building, wherein the centralized smoke exhaust system of the building comprises M indoor smoke exhaust ventilators arranged on different floors, a common flue and an outdoor host (4), the outdoor host (4) is provided with a control system (41), the outdoor host (4) is internally provided with the filter screen (42) and an outdoor fan system (43) arranged at the rear end of the filter screen (42), and the method is characterized in that: the control system (41) calculates the air volume by utilizing the running state of the main impeller of the outdoor fan and a coefficient calibrated in advance, calculates resistance values of a plurality of time points by combining the pressure measured by the pressure sensor, performs dynamic fitting, and calculates the residual life of the filter screen according to the use habit of the indoor unit. Compared with the prior art, the invention has the advantages that: 1. the invention can dynamically monitor the blocking condition caused by the oil stain accumulation of the filter screen at any time; 2. the invention can also carry out dynamic fitting according to the actual use condition of the indoor range hood and calculate the residual service life of the filter screen.
Description
Technical Field
The invention relates to a method for estimating the remaining service time of a filter screen in a centralized smoke exhaust system of a building.
Background
At present, most of high-rise houses adopt a centralized smoke exhaust mode, an indoor range hood is connected with a public flue through a smoke pipe and a check valve, and oil smoke in a kitchen is sucked by the indoor range hood and then is exhausted into the public flue through the smoke pipe. The top of the public flue is provided with an outdoor main machine, and the outdoor main machine further sucks and discharges the oil smoke in the public flue into outdoor atmosphere after being started. Along with the urban housing accounts for higher and higher, the pollution of discharging fume of public flue is more and more serious, in order to solve this problem, more producers adopt to install purifier on indoor range hood and carry out filtration purification to the oil smoke, and its main technical means is to install filter screen additional in user range hood air intake department of every floor or install purifier additional at the air outlet end. The disadvantages of this solution are mainly: firstly, the precision is not high enough; for a single indoor range hood, the service life of the filter screen or the purifying device can be judged only by the working time of the indoor range hood, and the time for replacing the purifying device or the filter screen is not fixed due to the difference of cooking habits of users on different floors; secondly, the cost is high, and the purification cost needs to be increased at the same time on the user side of each floor.
In order to reduce the cost, the outlet side of a common flue at the top of a building is provided with an oil smoke concentration filter screen in a centralized smoke exhaust system of some buildings. If the oil smoke centralized filter screen cannot be replaced in time after being used for a long time, the resistance of the oil smoke exhaust in the whole public flue is easily overlarge, even secondary pollution in a room is caused, and the effective air quantity is reduced, so that the oil smoke suction effect is reduced; and the too early change of oil smoke concentrates the filter screen and can lead to the effectual filter screen to be changed, causes the waste. At present, the filter screen service life judgment in the market usually adopts a method of setting total service time, however, the actual service life of the oil smoke concentration filter screen is changed by different starting rates (namely the proportion of the number of the opened indoor range hoods to the total floor number) and effective air volume, so that the replacement time of the oil smoke concentration filter screen in different service environments is not easy to accurately obtain.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for estimating the residual service time of a filter screen in a centralized smoke exhaust system of a building, which can dynamically update the residual service time of the filter screen according to the actual service condition.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a method for estimating residual service life of filter screen in centralized smoke exhaust system of building, wherein centralized smoke exhaust system of building is including installing M indoor suction lampblack absorber at different floors, and M is total floor number, and the air outlet of M indoor suction lampblack absorber all is linked together through respective indoor tobacco pipe and public flue, and outdoor host computer is installed at public flue top, outdoor host computer has control system, M indoor suction lampblack absorber all with control system communication connection, install the filter screen in the outdoor host computer and locate the outdoor fan system of filter screen rear end, its characterized in that: the control system estimates the residual service time of the filter screen by the following steps:
step 1, after starting an oil fume suction machine in any room, awakening a control system;
step 2, the control system counts the current starting rate of the indoor range hoods, wherein the starting rate is equal to the percentage of the number of the started indoor range hoods divided by M; judging whether the starting probability is greater than or equal to a preset value, if so, entering a step 3, and if not, entering a step 6;
step 5, judging whether S1 is larger than S0, if so, outputting a signal that the filter screen needs to be replaced by the control system; if not, entering step 8;
step 6, the control system controls the outdoor fan system to be temporarily not started; then the control system obtains the resistance value of the filter screen at the current moment, and records the resistance value of the filter screen at the current moment as S1; the control system reads the resistance value which needs to be replaced after the filter screen is blocked, and the resistance value which needs to be replaced after the filter screen is blocked is recorded as S0; judging whether S1 is larger than S0, if so, outputting a signal that the filter screen needs to be replaced by the control system (41); if not, entering step 7;
step 7, judging whether S1 is larger than Sc or not, wherein Sc is a preset constant smaller than S0; if yes, the control system controls the outdoor fan system to operate according to a preset fan gear, and then the step 8 is carried out; if not, directly entering step 8;
step 8, the control system saves the S1 and the current time point;
step 9, reading corresponding values between all stored S1 values and corresponding time points after the filter screen is replaced recently, obtaining a function relation between S1 and time t by using a fitting method or a drawing method, then obtaining a time value corresponding to S0 according to the function relation, and recording the time value corresponding to S0 as t 0; (ii) a
And 10, calculating the time between the current time point and t0, recording the time as tc, and outputting the tc as the remaining available time of the filter screen.
As an improvement, in the step 10, after tc is calculated, it is first determined whether tc is greater than a preset remaining time threshold ta, if so, tc is output as the remaining available time of the filter screen, if not, the local after-sales preparation of the filter screen is notified, and then tc is output as the remaining available time of the filter screen.
In step 3, the control system obtains the filter resistance value S1 at the current time by the following method:
step 3-1, the control system firstly obtains the rotating speed of the outdoor fan system, and the rotating speed is recorded as n 1;
3-2, judging whether n1 is greater than a normal rotating speed na of the outdoor fan system when the outdoor fan system operates at a preset fan gear, if so, outputting a signal that a filter screen needs to be replaced by the control system, if not, obtaining a function relation of the air volume and the rotating speed when the outdoor fan system operates at the preset fan gear, calculating a current actual air volume value according to n1, and recording the current actual air volume value as Q1;
3-3, acquiring a wind pressure value at the front side of the filter screen and a wind pressure value at the rear side of the filter screen, calculating a wind pressure difference value before and after the filter screen, and recording the wind pressure difference value before and after the filter screen as P1;
step 3-4, calculating the current filter screen resistance value S1 ═ P1/Q12。
In step 6, the control system obtains the filter resistance value S1 at the current time by the following method:
step 6-1, reading the air quantity value Q uploaded by the started indoor range hoodiCalculating the current actual total air quantity value Q, g ═ Sigma QiWherein g is a common flue leakage coefficient which is a preset constant, and i is a floor where the indoor range hood is opened;
step 6-2, acquiring a wind pressure value at the front side of the filter screen and a wind pressure value at the rear side of the filter screen, calculating a wind pressure difference value before and after the filter screen, and recording the wind pressure difference value before and after the filter screen as P1;
step 3-4, calculating the filter screen resistance value S1 at the current time to be P1/Q2。
In the step 3 and the step 6, the control system may further obtain the total weight gain of the filter screen, then obtain a function relation between the total weight gain of the filter screen and the filter screen resistance value prestored in the outdoor fan system, and then calculate the filter screen resistance value S1 at the current time according to the function relation.
Compared with the prior art, the invention has the advantages that:
1. the invention can dynamically monitor the blocking condition caused by the oil stain accumulation of the filter screen at any time;
2. the invention can also carry out dynamic fitting according to the actual use condition of the indoor range hood, calculate the residual service life of the filter screen, update the residual service life value in time and has higher intelligence.
Drawings
Fig. 1 is a schematic structural diagram of a centralized smoke exhaust system of a building in an embodiment of the invention.
FIG. 2 is a flow chart of the control system estimating the remaining filter usage time according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1, the centralized smoke exhaust system for a building includes M indoor smoke exhaust ventilators 11, 12, … … 1M installed on different floors, where M is the total floor number, the air outlets of the M indoor smoke exhaust ventilators 11, 12, … … 1M are all communicated with a common flue 3 through respective indoor smoke pipes 21, 22, … … 2M, an outdoor host 4 is installed on the top of the common flue 3, the outdoor host 4 has a control system 41, the M indoor smoke exhaust ventilators 11, 12, … … 1M are all in communication connection with the control system 41, a filter screen 42 and an outdoor fan system 43 installed at the rear end of the filter screen 42 are installed in the outdoor host 4, and the control system 41 estimates the remaining service time of the filter screen through the following steps:
step 1, after starting the range hood in any room, awakening a control system 41;
step 2, the control system 41 counts the starting rate of the current indoor range hoods, wherein the starting rate is equal to the percentage of the number of the started indoor range hoods divided by M; judging whether the on-time rate is greater than or equal to a preset value k1, if so, entering step 3, otherwise, entering step 6; in this step, the preset value k1 may be pre-stored in the control system 41;
step 5, judging whether S1 is larger than S0, if so, the control system 41 outputs a signal that the filter screen needs to be replaced; if not, entering step 8;
step 6, the control system 41 controls the outdoor fan system 43 to be not started for the moment; then the control system 41 obtains the filter screen resistance value at the current moment, and records the filter screen resistance value at the current moment as S1; the control system 41 reads the resistance value when the filter screen needs to be replaced after being blocked, and records the resistance value when the filter screen needs to be replaced after being blocked as S0; judging whether S1 is larger than S0, if so, the control system 41 outputs a signal that the filter screen needs to be replaced; if not, entering step 7;
step 7, judging whether S1 is larger than Sc or not, wherein Sc is a preset constant smaller than S0; if so, the control system 41 controls the outdoor fan system 43 to operate according to the preset fan gear, and then the step 8 is carried out; if not, directly entering step 8;
step 8, the control system 41 saves the S1 and the corresponding current time point;
step 9, the control system 41 reads corresponding values between all stored S1 values and corresponding time points after the filter screen is recently replaced, obtains a functional relation between S1 and time t by using a fitting method or a drawing method, then obtains a time value corresponding to S0 according to the functional relation, and records the time value corresponding to S0 as t 0;
step 10, calculating the time between the current time point and t0, recording the time as tc, judging whether tc is greater than a preset remaining time threshold value ta, if so, outputting tc as the remaining available time of the filter screen, if not, notifying local after-sales preparation of the filter screen, and then outputting tc as the remaining available time of the filter screen.
In step 3, the control system 41 may obtain the current filtering resistance value S1 by the following method:
step 3-1, the control system 41 firstly obtains the rotating speed of the outdoor fan system 43, the obtaining of the rotating speed can be detected by a rotating speed sensor, and the rotating speed is recorded as n 1;
3-2, judging whether n1 is greater than a normal rotating speed na of the outdoor fan system 43 when the outdoor fan system operates at a preset fan gear, if so, outputting a signal that a filter screen needs to be replaced by the control system 41, if not, acquiring a function relation between the air volume and the rotating speed when the outdoor fan system 43 operates at the preset fan gear, calculating a current actual air volume value according to n1, and recording the current actual air volume value as Q1;
3-3, acquiring a wind pressure value at the front side of the filter screen and a wind pressure value at the rear side of the filter screen, calculating a wind pressure difference value before and after the filter screen, and recording the wind pressure difference value before and after the filter screen as P1; the wind pressure value of the front side of the filter screen and the wind pressure value of the rear side of the filter screen can be obtained by detecting two pressure sensors;
step 3-4, calculating the current filter screen resistance value S1 ═ P1/Q12。
In this case, in step 6, the control system 41 may obtain the current screen resistance value S1 by:
step 6-1, reading the air quantity value Q uploaded by the started indoor range hoodiCalculating the current actual total air quantity value Q, g ═ Sigma QiWherein g is a common flue leakage coefficient which is a preset constant, and i is a floor where the indoor range hood is opened;
step 6-2, acquiring a wind pressure value at the front side of the filter screen and a wind pressure value at the rear side of the filter screen, calculating a wind pressure difference value before and after the filter screen, and recording the wind pressure difference value before and after the filter screen as P1;
step 3-4, calculating the filter screen resistance value S1 at the current time to be P1/Q2。
In the steps 3 and 6, the control system 41 may further obtain the total weight gain of the filter screen, where the total weight gain may be obtained through the detection data of the weight sensor, or may be obtained through other manners; and then, a function relation between the total weight gain of the filter screen and the filter screen resistance value prestored in the outdoor fan system 43 is obtained, and then the filter screen resistance value S1 at the current time is calculated according to the function relation.
Claims (5)
1. The utility model provides a method for estimating remaining service life of filter screen in centralized smoke exhaust system of building, wherein centralized smoke exhaust system of building is including installing M indoor suction hood (11, 12, … … 1M) on different floors, M is total floor number, and the air outlet of M indoor suction hood (11, 12, … … 1M) all is linked together through respective indoor tobacco pipe (21, 22, … … 2M) and public flue (3), and outdoor host computer (4) are installed at public flue (3) top, outdoor host computer (4) have control system (41), M indoor suction hood (11, 12, … … 1M) all with control system (41) communication connection, install filter screen (42) and locate outdoor fan system (43) at filter screen (42) rear end in outdoor host computer (4), its characterized in that: the control system (41) estimates the remaining service time of the filter screen by the following steps:
step 1, after starting an oil fume suction machine in any room, a control system (41) is awakened;
step 2, the control system (41) counts the starting rate of the current indoor range hoods, wherein the starting rate is equal to the percentage of the number of the started indoor range hoods divided by M; judging whether the starting probability is greater than or equal to a preset value, if so, entering a step 3, and if not, entering a step 6;
step 3, the control system (41) controls the outdoor fan system (43) to operate according to a preset fan gear, after the outdoor fan system (43) operates stably, the control system (41) obtains a filter screen resistance value at the current moment, and records the filter screen resistance value at the current moment as S1;
step 4, reading a resistance value which needs to be replaced after the filter screen is blocked by the control system (41), and recording the resistance value which needs to be replaced after the filter screen is blocked as S0;
step 5, judging whether S1 is larger than S0, if so, outputting a signal that the filter screen needs to be replaced by the control system (41); if not, entering step 8;
step 6, the control system (41) controls the outdoor fan system (43) to be temporarily not started; then the control system (41) obtains the current moment filter screen resistance value, and records the current moment filter screen resistance value as S1; the control system (41) reads the resistance value which needs to be replaced after the filter screen is blocked, and records the resistance value which needs to be replaced after the filter screen is blocked as S0; judging whether S1 is larger than S0, if so, outputting a signal that the filter screen needs to be replaced by the control system (41); if not, entering step 7;
step 7, judging whether S1 is larger than Sc or not, wherein Sc is a preset constant smaller than S0; if yes, the control system (41) controls the outdoor fan system (43) to operate according to a preset fan gear, and then the step 8 is carried out; if not, directly entering step 8;
step 8, the control system (41) saves the S1 and the current time point;
step 9, reading corresponding values between all stored S1 values and corresponding time points after the filter screen is replaced recently, obtaining a function relation between S1 and time t by using a fitting method or a drawing method, then obtaining a time value corresponding to S0 according to the function relation, and recording the time value corresponding to S0 as t 0;
and 10, calculating the time between the current time point and t0, recording the time as tc, and outputting the tc as the remaining available time of the filter screen.
2. The method for estimating the remaining service time of the filter screen in the centralized smoke exhaust system for the building according to claim 1, wherein the method comprises the following steps: in the step 10, after tc is calculated, it is first determined whether tc is greater than a preset remaining time threshold value ta, if so, tc is output as the remaining available time of the filter screen, if not, the local after-sales preparation filter screen is notified, and then tc is output as the remaining available time of the filter screen.
3. The method for estimating the remaining service time of the filter screen in the centralized smoke exhaust system for the building according to claim 1, wherein the method comprises the following steps: in the step 3, the control system (41) obtains the current filtering resistance value S1 by the following method:
step 3-1, the control system (41) firstly obtains the rotating speed of the outdoor fan system (43), and the rotating speed is recorded as n 1;
3-2, judging whether n1 is greater than a normal rotating speed na of the outdoor fan system (43) when the outdoor fan system operates at a preset fan gear, if so, outputting a signal that a filter screen needs to be replaced by the control system (41), if not, acquiring a function relation between the air volume and the rotating speed when the outdoor fan system (43) operates at the preset fan gear, calculating a current actual air volume value according to n1, and recording the current actual air volume value as Q1;
3-3, acquiring a wind pressure value at the front side of the filter screen and a wind pressure value at the rear side of the filter screen, calculating a wind pressure difference value before and after the filter screen, and recording the wind pressure difference value before and after the filter screen as P1;
step 3-4, calculating the current filter screen resistance value S1 ═ P1/Q12。
4. The method for estimating the remaining service time of the filter screen in the centralized smoke exhaust system for the building according to claim 3, wherein the method comprises the following steps: in step 6, the control system (41) obtains the current screen resistance value S1 by:
step 6-1, reading the air quantity value Q uploaded by the started indoor range hoodiCalculating the current actual total air quantity value Q, g ═ Sigma QiWherein g is a common flue leakage coefficient which is a preset constant, and i is a floor where the indoor range hood is opened;
step 6-2, acquiring a wind pressure value at the front side of the filter screen and a wind pressure value at the rear side of the filter screen, calculating a wind pressure difference value before and after the filter screen, and recording the wind pressure difference value before and after the filter screen as P1;
step 3-4, calculating the filter screen resistance value S1 at the current time to be P1/Q2。
5. The method for estimating the remaining service time of the filter screen in the centralized smoke exhaust system for the building according to claim 1, wherein the method comprises the following steps: in the step 3 and the step 6, the control system (41) first obtains the total weight gain of the filter screen, then obtains a function relation between the total weight gain of the filter screen and the filter screen resistance value prestored in the outdoor fan system (43), and then calculates the filter screen resistance value S1 at the current time according to the function relation.
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