CN111594888A - Central flue system and air volume self-adaptive adjusting method thereof - Google Patents
Central flue system and air volume self-adaptive adjusting method thereof Download PDFInfo
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- CN111594888A CN111594888A CN201910127270.1A CN201910127270A CN111594888A CN 111594888 A CN111594888 A CN 111594888A CN 201910127270 A CN201910127270 A CN 201910127270A CN 111594888 A CN111594888 A CN 111594888A
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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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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- 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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Abstract
The utility model provides a central flue system, is linked together through tobacco pipe and public flue including installing the range hood at different floors, range hood air outlet, all installs the fire prevention valve at the tobacco pipe exit end, installs outdoor host computer and host control system at public flue top, installs indoor range hood control system, its characterized in that on every range hood: the outdoor host machine comprises at least two fans which are connected in parallel, each fan is isolated by a partition plate, and the air outlet of the public flue is communicated with the air inlet of each fan. The invention also discloses an air volume self-adaptive adjusting method of the central flue system. The invention has the advantages that: the outdoor main machine of the central flue system adopts a multi-power source design, the dependence on the main machine and the high requirement on the performance of the main machine are reduced, in addition, an electric check valve is replaced by a common fire damper, the fault rate of the system is reduced, the air volume self-adaptive adjusting method of the central flue system is high in efficiency, energy-saving and reliable, and the flow using requirements of all floors can be met.
Description
Technical Field
The invention relates to a central flue system, in particular to a central flue system and an air volume self-adaptive adjusting method thereof.
Background
At present, most of high-rise houses adopt a centralized smoke exhaust mode, an indoor range hood, a smoke pipe and a check valve are connected with a public flue, so that smoke in a kitchen is exhausted into the public flue through the smoke pipe through the indoor powered range hood. However, the cooking habit of big oil smoke of Chinese people and the current situation of big air volume and big air pressure of the existing range hood cause the pressure distribution in the public flue to be extremely uneven, and the problems of unsmooth smoke discharge exist, generally the smoke discharge effect of a high layer is good, the smoke discharge effect of a low layer is poor, and especially in the peak cooking period; meanwhile, the valve plate of the check valve is not closed tightly, and the phenomena of smoke return, taint of odor and the like are easily generated. Particularly, for the engineering range hood, the performance is relatively poor, so that the phenomenon that smoke is difficult to be discharged from a low floor is obvious under the conditions of high-rise houses and high starting rate.
The existing concentrated smoke discharging mode for high-rise fine decoration has the defects that the smoke discharging effect is poor due to the factors of non-standard smoke discharging machine installation, poor smoke discharging machine performance, small flue size, high starting rate and the like, and the actual air volume is difficult to reach the air volume (8-10 m) required by the excellent smoke discharging effect3Fig. 1 shows a 35-storey high-rise residence, the size of the cross section in a flue is 470mm × 370mm (national building standard design drawing set residence exhaust passage standard 16J916-1), and a certain type of range hood is installed (the measured maximum flow is 15.6 m)3Min, maximum static pressure 362Pa), flow distribution at 40% uniform opening rate. As can be seen from figure 1, the flow distribution of each floor is uneven, the flow of the high floor is large, the flow which can be discharged by the low floor user is small, and the flow is only 5m3And about/min, the use requirement is difficult to meet. In addition, in the actual process, the resistance such as a fireproof check valve and a flue outlet hood and the uneven starting position exist, and the actual flow rate is smaller than the calculated flow rate value.
In order to solve the problem of unsmooth smoke discharge of the existing range hood, in recent years, a concept of a central purification system is developed, a fan arranged at the top end of a public flue generates power, and the flow of each floor is uniformly distributed by matching with the adjustment of a check valve plate connected with the public flue, so that the aims of smooth smoke discharge and low-noise use scenes are fulfilled. However, since the air volume of each floor is closely related to factors such as the turn-on rate, the turn-on position, the flue structure size, and the like, in order to achieve uniform distribution of the air volume, it is necessary to establish a quantitative relationship between the valve plate angle and the factors such as the turn-on rate, the turn-on position, the flue structure size, and the like in advance, which results in a complex air volume adjusting algorithm, especially when multi-gear adjustment is considered. In addition, the valve plate of the electric valve is frequently adjusted and oil stains are adhered, so that the service life of the electric valve faces great challenges. In addition, the roof main machine is the only power for absorbing oil smoke of the whole building, so that the requirements on the performance and the reliability of the main machine are high, and the requirement on the flue tightness is also high.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a central flue system capable of effectively solving the problem of difficult smoke discharge for low-rise users of high-rise residences, in view of the above-mentioned current state of the art.
The second technical problem to be solved by the present invention is to provide a wind volume adaptive adjustment method for a central flue system, which is multi-powered and has an indoor unit gear capable of matching with an indoor unit operation status, in view of the above-mentioned current state of the prior art.
The technical scheme adopted by the invention for solving the first technical problem is as follows: this central flue system, including installing the range hood at different floors, the air outlet of every range hood all is linked together through respective tobacco pipe and public flue, all installs the fire prevention valve at the exit end of every tobacco pipe outdoor host computer and host control system are installed at public flue top, install indoor range hood control system, its characterized in that on every range hood: the outdoor host machine comprises at least two fans which are connected in parallel, each fan is isolated by a partition plate, and the air outlet of the public flue is communicated with the air inlet of each fan.
Preferably, the fan be centrifugal fan, centrifugal fan be unilateral air inlet and along the horizontal direction air-out, and centrifugal fan's air-out direction is the same.
Preferably, the centrifugal fans are provided with two air inlets which are opposite to the partition plate.
In order to purify the oil fume discharged from the public flue, a filter screen is arranged in the air duct between the outlet of the public flue and the air inlet of the fan.
The host control system and the indoor range hood control system can communicate in various ways, and preferably, the indoor range hood control system and the host control system transmit signals in a wireless way.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the air volume self-adaptive adjusting method of the central flue system is characterized in that the operation logic of the outdoor host comprises the following steps:
firstly, starting an indoor range hood and sending startup information to a host control system;
secondly, the host control system calculates the current turn-on rate eta;
thirdly, judging whether the opening rate eta meets eta which is less than or equal to M, wherein M is a preset value;
if eta is less than or equal to M, the outdoor host does not run;
if eta is more than M, the outdoor host computer operates to a corresponding gear to ensure the air exhaust volume of the outdoor host computer;
the operation logic of the indoor range hood comprises the following steps:
firstly, the indoor range hood runs to a default gear and records the current gear number;
secondly, feeding back the current air quantity value in real time according to the current power value by each starting floor;
③, judging the current air quantity value Q and the preset air quantity range X1～X2The size of (d);
if X1≤Q≤X2Within the range, the current gear is kept unchanged, and the flow range of each floor is within the preset range X1～X2Within;
if Q < X1Skipping to a high gear and determining the number of the adjusted gear;
if Q > Sc2If yes, skipping to a low gear, and determining the adjusted gear number;
④, according to the adjusted gear number determined in step ③, returning to step ② and continuing to adjust until the air volume value is within the preset range X1～X2And (4) the following steps.
Preferably, the step (c) confirms the adjusted gear number according to the current gear number and the corresponding input current data table.
Compared with the prior art, the invention has the advantages that: the outdoor main machine of the central flue system adopts a multi-power source design, the dependence on the main machine and the high requirement on the performance of the main machine are reduced, in addition, an electric check valve is replaced by a common fire damper, the fault rate of the system is reduced, the air volume self-adaptive adjusting method of the central flue system is high in efficiency, energy-saving and reliable, and the flow using requirements of all floors can be met.
Drawings
FIG. 1 is a schematic diagram of the flow distribution for a total 35 stories of a building at a 40% uniform turn-on rate;
FIG. 2 is a schematic structural diagram of an overall flue system according to an embodiment of the present invention;
fig. 3 is a schematic view of an installation structure of an outdoor host according to an embodiment of the present invention;
fig. 4 is a flowchart of an air volume adaptive adjustment method 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. 2 and 3, the central flue system in this embodiment includes range hoods 1 installed on different floors, i.e., indoor units, each range hood 1 includes a range hood fan (not shown), i.e., each indoor range hood 1 can generate power, and each range hood 1 is installed with an indoor range hood control system 7. The air outlet of each range hood 1 is communicated with a common flue 3 through a respective smoke tube 2, the outlet end of each smoke tube 2 is provided with a fire damper 4, the top of the common flue 3 is provided with an outdoor host 5 and a host control system 6, and the host control system 6 and an indoor range hood control system 7 are in signal transmission in a wireless mode.
In this embodiment, the outdoor host 5 includes at least two centrifugal fans 51 connected in parallel, an air outlet of the common flue 3 is communicated with an air inlet of the centrifugal fans 51, and a filter screen 9 is installed in an air duct between an outlet of the common flue 3 and the air inlet of the centrifugal fans 51. Keep apart through baffle 8 between two centrifugal fan 51, the vertical setting of baffle 8, two centrifugal fan 51 are unilateral air inlet and the air intake all just to baffle 8. The air outlet of the centrifugal fan 51 is in the same air outlet direction as the horizontal direction.
As shown in fig. 4, the operation logic of the outdoor host 5 of the air volume adaptive adjusting method of the central flue system of the present embodiment includes the following steps:
firstly, starting an indoor range hood and sending startup information to a host control system;
secondly, the host control system calculates the current turn-on rate eta;
thirdly, judging whether the opening rate eta meets eta which is less than or equal to M, wherein M is a preset value;
if eta is less than or equal to M, the outdoor host does not run;
if eta is more than M, the outdoor host computer operates to a corresponding gear to ensure the air exhaust volume of the outdoor host computer;
the operation logic of the indoor range hood comprises the following steps:
firstly, the indoor range hood runs to a default gear and records the current gear number;
secondly, feeding back the current air quantity value in real time according to the current power value by each starting floor;
③, judging the current air quantity value Q and the preset air quantity range X1～X2The size of (d);
if X1≤Q≤X2Within the range, the current gear is kept unchanged, and the flow range of each floor is within the preset range X1～X2Within;
if Q < X1Skipping to a high gear and determining the number of the adjusted gear;
if Q > Sc2If yes, skipping to a low gear, and determining the adjusted gear number;
④, according to the adjusted gear number determined in step ③, returning to step ② and continuing to adjust until the air volume value is within the preset range X1～X2And (4) the following steps.
And step three, confirming the adjusted gear number according to the current gear number and the corresponding input current data table.
The core key points of the air volume adaptive adjusting method of the embodiment are as follows:
1. the indoor range hood has N gears, and numbering is carried out from 1-N gears (the gear performance is sequentially improved). When the indoor range hood of a user on a certain floor is started, the range hood firstly defaults to operate at a certain gear between 1 and N, and the number of the gear is recorded. At the moment, the current power value of the indoor range hood is judged, the current air quantity value Q (note that the power of the range hood at a certain gear and the air quantity data have a one-to-one correspondence relationship) is obtained through interpolation calculation according to the power value, and if the Q value is in the preset air quantity range X under the current gear1～X2Within (the effective air volume is generally 8-10 m)3Meeting the smoke exhaust requirement within/min), when the air volume of the floor at the moment meets the use requirement, the floor is continuously operated at the gear, if the air volume is smaller, the floor jumps to a higher gear, and if the air volume is larger, the floor jumps to a lower gear. Therefore, the air volume self-adaption of the indoor unit can be realized, and the difficulty brought by factors such as flue structure, size and installation condition to an air volume adjusting algorithm is eliminated.
2. The outdoor host machine adopts a parallel connection mode of multiple fans, and determines the operating gear and the number of the fans according to the number of starting users.
3. The resistance of the flue is mainly overcome by the indoor range hood, and the outdoor main machine mainly overcomes the resistance of the filter screen and the air outlet and generates a smaller negative pressure value at the flue opening, so the design aims at reducing the performance requirement and the input power of the main machine and eliminating the risk that the high-rise fireproof check valve is possibly sucked away.
The trip mode of the indoor range hood is as follows:
1. when the air quantity is within the preset range (X)2～X1) The difference is bigger, or when the floor number is less, the total gear number ratio of indoor range hood machine can be less, can adopt the form of gear adjustment one by one this moment, and the benefit of mode is that control algorithm edits simply like this.
2. When the air quantity is within the preset range (X)2～X1) Comparison of the differenceLittle, or when the floor number is higher, indoor range hood gear figure can be more this moment, if the adjustment of stepping into gear, can make gear adjustment number of times frequent, so adopt present amount of wind Q and the difference of the predetermined scope of amount of wind to judge this moment, according to (Q-X)2) Or (X)1-Q) to determine the number of skip shifts, the greater the difference, the greater the number of skip shifts and vice versa.
In this embodiment, CFD simulation calculation is used to demonstrate the above scheme and obtain some key parameter values:
calculating conditions: total floor 35 layers, the highest rate of opening is 40%, two shelves are total for example in the display gear on the indoor range hood operation panel, divide into big shelves and small shelves (what reflect is user's demand flow), the effective amount of wind preset range of each shelves: large gear (8-10 m)3Min), small (6-8 m)3Min), the total gear of the indoor variable frequency DC motor is 10 gears, the maximum static pressure of the performance of the 1 st gear is 280Pa, and the maximum air volume is 10m3Min, maximum static pressure 740Pa of 10 th gear performance and maximum air quantity 18m3The method comprises the steps of/min, the size of the inner section of a flue is 470mm and × 370mm, the outdoor host machine is formed by connecting double fans in parallel (the size of the fans can be reduced), the fans are multi-wing centrifugal fans, the fans are arranged in a mode shown in figure 3, air enters from one side, horizontal air outlet is adopted, the wind resistance is reduced, the two fans are separated by a partition plate, the interference between the double fans is avoided, the diameter of the outer contour of an impeller of the fan is 350mm, the number of blades is 60, the rotating speed is determined according to the starting rate, and the feasibility of the concept and the method provided by the embodiment is verified by analyzing the following typical starting conditions in the.
TABLE 1 several typical starting positions for calculation (starting with big gear without notation)
| Numbering | Rate of opening | Floor for starting up machine | Type of boot | Whether the host is turned on |
| Case1 | 40％ | 1,3,6,9,11,13,16,18,21,24,26,29,32,35 | Uniform startup | Is opened |
| Case2 | 40％ | 1,2,3,5,6,8,9,11,12,13,16,24,28,29 | Uneven startup | Is opened |
| Case3 | 40％ | 1,3,6 (small gear), 9,11,13 (small gear), 16,18,21,24 (small gear), 26,29,32,35 | Uniform startup | Is opened |
| Case4 | 20％ | 1,6,13,18,24,29,32 | Uniform startup | Is opened |
| Case5 | 20％ | 1,6,13,18,24,29,32 | UniformityStarting up | Not to open |
TABLE 2 results of Case1 and Case2 (both fans on, impeller speed 1500rpm)
It can be seen from table 2 that, under the conditions of the set indoor unit performance and the set outdoor host rotation speed, when the indoor unit is uniformly started up at a startup rate of 40%, each floor runs at different gears, the low floor runs at a high gear, and the high floor runs at a low gear, so that the effective flow of each startup floor can be ensured to be 8-10m3And the design requirement is met between/min. In the case of an uneven starting position, the effective flow rate of the lower layer is slightly insufficient, so to meet the effective flow rate in the starting position, the performance of the 10 th gear of the indoor unit needs to be further improved or the rotating speed of the outdoor host computer needs to be slightly increased.
TABLE 3 results of Case3 (both fans on, impeller speed 1500rpm)
The calculation results in table 3 show that when the users in the 6, 13 and 24 layers adopt small gears for operation, the actual operation gear number is reduced, and the actual flow is 6-8m3Within the range of/min, and when other floors adopt large-gear operation, the actual flow is 8-10m3The/min range conforms to the flow demand of the user, which shows that the air volume adjusting scheme provided by the embodiment can realize multi-gear air volume adjustment of the indoor unit, and the flow can be selected according to the user demand, so that more use experience is achieved.
Results of calculation of Case4 and Case5 in Table 4
The results in table 4 show that at 20% turn-on rate, the host rotates at 800rpm, the flow rate of each floor can reach the preset range, and each floor operates at a low gear. When the main machine is closed, the flow of each floor can be within the preset air volume range only by the indoor machine, and the running gear of the indoor machine does not reach a larger gear. Therefore, under the condition of low on-time rate, the outdoor main machine can not be operated, and the air quantity requirement can be realized only by adjusting the gear of the indoor machine.
Some of the key points of the system can be derived from the above simulation calculation results as follows:
1. judging whether the host is started up or not, wherein the critical startup rate value M is as follows: the selection of the M value is related to the air outlet resistance of the outdoor main machine, and the M value can be selected by 20% under the condition that the air outlet of the fan is in a horizontal form and no other additional air outlet channel exists.
2. The rotating speed of the outdoor main machine is determined according to the turn-on rate, and for the parallel arrangement condition of the double fans with horizontal air outlet, the relationship between the rotating speed n of the main machine and the turn-on rate eta is obtained through calculation: n is (eta/0.4) multiplied by 1600rpm, and the outer diameter of the impeller is 350mm, so that the requirement can be met. The number of the fans of the outdoor host machine is selected according to the total floor number, the higher the floor number is, the more the fans are, and for floors about 35 floors, two groups of fans are selected to be connected in parallel.
3. The gear performance of the indoor unit, the maximum static pressure of 280Pa of the 1 st gear and the maximum air volume of 10m3Min, maximum static pressure of the first gear 740Pa and maximum air quantity of 18m3Min; number of gears and preset flow X1～X2In a range of, if (X)2-X1) When the number of shift stages is 2, about 10 shift stages are required, and if (X)2-X1) If 1, the number of gears needs to be 15 or more.
4. The corresponding relation between the large gear and the small gear displayed on the operation panel and the actual motor gear number is as follows: the small gear corresponds to the gear number 3, and the target flow is 6-8m3Min; the large gear corresponds to a gear number of 7, and the target flow is 8-10m3/min。
Claims (7)
1. The utility model provides a central flue system, is including installing range hood (1) at different floors, and the air outlet of every range hood (1) all is linked together with public flue (3) through respective tobacco pipe (2), all installs fire prevention valve (4) at the exit end of every tobacco pipe (2) outdoor host computer (5) and host control system (6) are installed at public flue (3) top, install indoor oil absorption smoke ventilator control system (7), its characterized in that on every range hood (1): the outdoor host (5) comprises at least two fans which are connected in parallel, each fan is isolated by a partition plate (8), and the air outlet of the public flue (3) is communicated with the air inlet of each fan.
2. The central flue system of claim 1 wherein: the fan be centrifugal fan (51), centrifugal fan (51) are unilateral air inlet and along the horizontal direction air-out, just centrifugal fan (51)'s air-out direction is the same.
3. The central flue system of claim 2 wherein: the centrifugal fans (51) are provided with two air inlets which are just opposite to the partition plate (8).
4. The central flue system of claim 1 wherein: and a filter screen (9) is arranged in the air channel between the outlet of the common flue (3) and the air inlet of the fan.
5. The central flue system of claim 1 wherein: and the indoor range hood control system (7) and the host control system (6) are in signal transmission in a wireless mode.
6. The air volume self-adaptive adjusting method of the central flue system as claimed in claim 1, wherein the operation logic of the outdoor main unit comprises the following steps:
firstly, starting an indoor range hood and sending startup information to a host control system;
secondly, the host control system calculates the current turn-on rate eta;
thirdly, judging whether the opening rate eta meets eta which is less than or equal to M, wherein M is a preset value;
if eta is less than or equal to M, the outdoor host does not run;
if eta is more than M, the outdoor host computer operates to a corresponding gear to ensure the air exhaust volume of the outdoor host computer;
the operation logic of the indoor range hood comprises the following steps:
firstly, the indoor range hood runs to a default gear and records the current gear number;
secondly, feeding back the current air quantity value in real time according to the current power value by each starting floor;
③, judging the current air quantity value Q and the preset air quantity range X1～X2The size of (d);
if X1≤Q≤X2Within the range, the current gear is kept unchanged, and the flow range of each floor is within the preset range X1～X2Within;
if Q < X1Skipping to a high gear and determining the number of the adjusted gear;
if Q > Sc2If yes, skipping to a low gear, and determining the adjusted gear number;
④, according to the adjusted gear number determined in step ③, returning to step ② and continuing to adjust until the air volume value is within the preset range X1～X2And (4) the following steps.
7. The adaptive air volume adjusting method of the central flue system according to claim 6, characterized in that the adjusted gear number is confirmed according to the current gear number and the corresponding input current data table in the third step.
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| CN114383173A (en) * | 2022-02-22 | 2022-04-22 | 杭州老板电器股份有限公司 | Central range hood system and control method thereof |
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| CN112484110A (en) * | 2020-11-10 | 2021-03-12 | 华帝股份有限公司 | Smoke discharge control method and control system for public flue |
| CN112484110B (en) * | 2020-11-10 | 2022-12-02 | 华帝股份有限公司 | Smoke discharge control method and control system for public flue |
| CN112524663A (en) * | 2020-11-18 | 2021-03-19 | 华帝股份有限公司 | Air quantity regulation control method and control system of central flue system |
| CN112524663B (en) * | 2020-11-18 | 2023-09-01 | 华帝股份有限公司 | Air quantity adjusting control method and system for central flue system |
| CN112555939A (en) * | 2020-11-30 | 2021-03-26 | 青岛海尔智慧厨房电器有限公司 | Smoke machine system and control method and device thereof |
| CN113587161A (en) * | 2021-06-25 | 2021-11-02 | 华帝股份有限公司 | Communication method of central flue system and central flue system adopting same |
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