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An impeller detection method in a building centralized smoke exhaust system

A smoke exhaust system and detection method technology, applied in the direction of heating method, oil fume removal, non-variable pump, etc., can solve the problems of aggravated oil pollution accumulation, load imbalance, impeller eccentricity increase, etc., so as to alleviate oil pollution accumulation and make accurate judgment Effect

Active Publication Date: 2022-02-18
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, the air outlet of the user-side indoor range hood is connected to the public flue through an adjustable angle valve. The outdoor main fan system is equipped with a centralized filtration system, which has begun to be used in some well-decorated buildings. The outdoor main fan system is aimed at different indoor The operating rate of the range hood is controlled by frequency conversion, or the flow distribution is realized by adjusting the angle of the adjustable angle valve on different floors; in the centralized smoke exhaust system of the building, the outdoor main fan system and the indoor range hood are often equipped with impellers. Therefore, the separation degree of grease can be effectively improved, but after a certain period of use, since indoor range hoods and outdoor main fan systems are mostly installed vertically with radial fans, and the impellers are generally installed vertically, the accumulation of oil stains on the lower part of the impellers will be biased. And when the range hood is turned off, the separated grease will stay in the lower part of the impeller, which will intensify the accumulation of oil, which will lead to the eccentricity of the impeller and the unbalanced load.
At present, only regular cleaning and maintenance of the impeller can be used in the market to alleviate the eccentricity and load imbalance of the impeller.

Method used

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  • An impeller detection method in a building centralized smoke exhaust system
  • An impeller detection method in a building centralized smoke exhaust system
  • An impeller detection method in a building centralized smoke exhaust system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]like figure 1 The shown building centralized smoke exhaust system includes M indoor range hoods 11, 12... 1M arranged inside the household kitchens on different floors, where M is a natural number; the public flue 2 arranged inside the building is arranged in the The outdoor main fan system 3 on the top floor, the air outlets of multiple indoor range hoods are connected to the public flue through the angle-adjustable electric check valve 4, and the air outlets of the public flue are connected to the entrance of the outdoor fan system; The range hood is equipped with an indoor fan and an indoor impeller, and the indoor impeller is driven by the indoor fan; the indoor range hood presets the oil pollution accumulation state parameter r, the initial value of r is 0, and the indoor impeller detection state parameter S, the initial value of S is 0; The indoor range hood detects the indoor impeller through the following steps, see figure 2 Shown:

[0040] Step 1. The user ch...

Embodiment 2

[0055] The difference from Embodiment 1 is that the ninth step is: performing Clark transformation on the V-phase current value, the U-phase current value and the W-phase current value, and transforming the three-phase current into two-phase current in static coordinates, respectively: α Axis current Iα and β-axis current Iβ; then Parker transformation is performed, the two-phase current of the stationary coordinates is converted into the two-phase currents of the rotating coordinates, respectively: d-axis current Id and q-axis current Iq; the q-axis current Iq is Fu Lie leaf expansion, read the amplitude of the fundamental wave component, which is recorded as mi; and read the corresponding current fundamental wave amplitude thresholds ma and mb when the corresponding indoor fan is running at a constant first preset speed Ni; ma image 3 shown.

Embodiment 3

[0057] The difference from Embodiment 1 is that when it is judged in step 11 that the indoor impeller is eccentric and the load is unbalanced, the indoor range hood enters a maintenance mode for pulsating maintenance of the indoor impeller. In the maintenance mode, the interior of the indoor range hood The preset maintenance cycle parameter T, the initial value of T is 0, the maintenance mode includes the following steps, see Figure 4 Shown:

[0058] Step 1. The indoor impeller rotates forward at the second preset gear position Ts for the second preset time t2, then stops for the third preset time t3, and enters step 2;

[0059] Step 2. The indoor impeller reverses for the fourth preset time t4 at the second preset gear position Ts, and then stops for the third preset time t3, and enters step 3;

[0060] Step 3. Add 1 to the maintenance cycle parameter T, and enter step 4;

[0061] Step 4. Determine whether T is equal to the preset maintenance cycle threshold Ts, if not, re...

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Abstract

The invention relates to an impeller detection method in a building centralized smoke exhaust system, which is characterized in that it includes: step 1, the user chooses to shut down the indoor range hood after using it, and if necessary, enters the indoor impeller self-inspection. When the angle-adjusting electric check valve is closed, the indoor motor in the corresponding indoor oil suction fume will be operated at the first preset speed Ni in a constant speed mode, and the V-phase current value, U-phase current value and W-phase current value of the indoor motor will be collected. Select the value with a large deviation of the three-phase current, record it as mi, and compare mi with the fluctuation thresholds ma and mb. If ma < mi ≤ mb in different gears for r1 consecutive times, determine the indoor range hood corresponding to the indoor range hood. The accumulation of oil on the impeller causes eccentricity and load imbalance of the indoor impeller. Compared with the prior art, the impeller detection method provided by the invention can draw more accurate judgment conclusions.

Description

technical field [0001] The invention relates to an impeller detection method in a building centralized smoke exhaust system. Background technique [0002] At present, most of the range hoods used in the kitchens of houses and apartments are independent. Holes in the windows or walls are used to set the exhaust port of the range hood. The oil fume is discharged directly from the outer wall, which will cause pollution interference to the residents on the upper and lower floors, and will cause oil pollution to the outer wall. At the same time, it will also affect the overall appearance of the building. [0003] With the high-speed development of economy, more and more high-rise residential buildings have sprung up like mushrooms after rain. In order to maintain the appearance and image of the entire building, in many high-rise residential buildings, a centralized smoke exhaust system for the building will be adopted for centralized smoke exhaust. The public flue, the outdoor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D27/00F24C15/20
CPCF04D27/001F04D27/008F24C15/2021
Inventor 何立博
Owner NINGBO FOTILE KITCHEN WARE CO LTD