CN114857050A - Efficient control method of pigsty ventilation fan - Google Patents
Efficient control method of pigsty ventilation fan Download PDFInfo
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- 238000009423 ventilation Methods 0.000 title claims abstract description 173
- 238000000034 method Methods 0.000 title claims abstract description 27
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 17
- 238000012937 correction Methods 0.000 claims description 14
- 230000007613 environmental effect Effects 0.000 claims description 10
- 238000005299 abrasion Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 241000282887 Suidae Species 0.000 description 5
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- OVBPIULPVIDEAO-LBPRGKRZSA-N folic acid Chemical compound C=1N=C2NC(N)=NC(=O)C2=NC=1CNC1=CC=C(C(=O)N[C@@H](CCC(O)=O)C(O)=O)C=C1 OVBPIULPVIDEAO-LBPRGKRZSA-N 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000013372 meat Nutrition 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 241000287828 Gallus gallus Species 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
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- 238000005086 pumping Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention relates to the technical field of control and adjustment, in particular to an efficient control method of a pigsty ventilation fan. The method comprises the following steps: calculating the influence factors of the effective work of each ventilating fan according to the use time of each ventilating fan, the air pressure of each subarea at the current moment and the air pressure outside the pigsty; calculating the required intensity of each subregion according to the temperature, the humidity and the ammonia concentration of each subregion at the current moment; classifying each subregion according to the required intensity to obtain each target region; judging whether each target area needs ventilation or not according to the required intensity of each subarea in each target area; for any target area requiring ventilation: calculating the initial power of each ventilation fan corresponding to the target area according to the maximum value of the required intensity of ventilation in the target area; and obtaining the target power of each ventilation fan according to the actual rotating speed corresponding to the initial power of each ventilation fan and the influence factors of effective work. The method provided by the invention can effectively improve the environment in the pigsty.
Description
Technical Field
The invention relates to the technical field of control and regulation, in particular to an efficient control method of a pigsty ventilation fan.
Background
The ventilation fan is an air conditioning appliance, also called as a ventilation fan, which drives blades to rotate to drive airflow so as to exchange indoor air and outdoor air. The purpose of ventilation is to remove dirty air from the room and to regulate temperature, humidity and sensory effects. Ventilators are widely used for ventilation, dust removal and cooling in piggeries, chicken houses, factories, mines, tunnels, cooling towers, vehicles, ships and buildings. The environmental sanitation conditions of the pigsty are very important for the pig farm, because the environmental conditions not only determine the growth speed of the pigs and the quality of the meat, but also are often related to various diseases. The conventional ventilation fan of the pigsty is generally used at a fixed frequency when in use, a large amount of energy loss can be caused, and when the exhaust heat dissipation intensity is overlarge, pigs in the pigsty can be sick. At present, a domestic large-scale pigsty is provided with a variable-frequency ventilator, and the variable-frequency ventilator can be uniformly adjusted according to various conditions inside and outside the pigsty, so that the living environment in the pigsty is ensured, but the method does not consider that the environments in different areas in the pigsty are different, for example, the humidity of some areas is too large, the humidity of some areas is small, and the adjustment of the ventilator is not accurate enough.
Disclosure of Invention
In order to solve the problem that the power of each ventilation fan in the pigsty is inaccurately adjusted in the conventional method, the invention aims to provide an efficient control method of the pigsty ventilation fans, which adopts the following technical scheme:
the invention provides a high-efficiency control method of a pigsty ventilation fan, which comprises the following steps:
acquiring environmental indexes of each subregion in the pigsty, wherein the environmental indexes comprise temperature, humidity and ammonia concentration; calculating the influence factors of the effective work of each ventilating fan at the current moment according to the use time of each ventilating fan, the air pressure corresponding to each subregion at the current moment and the air pressure outside the pigsty at the current moment;
calculating the ventilation and ventilation requirement intensity of each subregion at the current moment according to the temperature corresponding to each subregion at the current moment, the humidity corresponding to each subregion at the current moment and the ammonia concentration corresponding to each subregion at the current moment; classifying the subregions in the piggery according to the ventilation requirement strength of the subregions at the current moment to obtain target regions; judging whether each target area needs ventilation or not according to the ventilation requirement strength of each subarea in each target area;
for any target area requiring ventilation: calculating the initial power of each ventilation fan corresponding to the target area according to the maximum value of the required intensity of ventilation in the target area; and obtaining the target power corresponding to each ventilation fan according to the actual rotating speed corresponding to the initial power of each ventilation fan, the standard rotating speed corresponding to the initial power of each ventilation fan and the influence factors of the effective work of each ventilation fan.
Preferably, the calculating, according to the use time of each ventilation fan, the air pressure corresponding to each sub-area at the current time, and the air pressure outside the pig house at the current time, the influence factor of the effective operation of each ventilation fan at the current time includes:
for any sub-region: calculating the air pressure difference between the subregion and the outside of the pigsty at the current moment according to the air pressure corresponding to the subregion at the current moment and the air pressure outside the pigsty at the current moment;
and calculating the influence factors of the effective work of each ventilating fan at the current moment according to the air pressure difference between each subarea and the outside of the pigsty and the service time of each ventilating fan at the current moment.
Preferably, the following formula is adopted to calculate the influence factors of the effective work of each ventilating fan at the current moment:
u is an influence factor of effective work of any ventilation fan at the current moment, delta P is the air pressure difference between a sub-region corresponding to the ventilation fan and the outside of the piggery, tanh () is a hyperbolic tangent function, arctan () is an arc tangent function, t is the service time of the ventilation fan, sign () is a sign function, and alpha is a first correction coefficient;
the sub-area corresponding to the ventilation fan is the sub-area closest to the ventilation fan.
Preferably, the following formula is adopted to calculate the intensity of the ventilation demand of each sub-area at the current time:
wherein I is the required intensity of ventilation of any sub-area at the current moment, exp () is a power exponent with the base number of e, Max () is a maximum function, beta is a second correction coefficient, W now For the humidity corresponding to the sub-area at the present moment, W std Is standard humidity, T, in the pigsty now For the temperature, T, corresponding to the sub-region at the present moment std Is the standard temperature in the pigsty，N now The ammonia gas concentration, N, corresponding to the subregion at the current moment std Is the standard ammonia concentration in the pigsty.
Preferably, the initial power of each ventilator corresponding to the target area is calculated by the following formula:
wherein, P is the initial power of any ventilator corresponding to the target area, P 0 Is the rated power of the ventilator, I Max Maximum value of the intensity of the demand for ventilating the sub-areas in the target area, D Max The distance, gamma, between the ventilator and the sub-area corresponding to the maximum value of the intensity of the ventilation demand in the target area 1 Is a third correction coefficient, γ 2 As a fourth correction coefficient, exp () is a power exponent with base e.
Preferably, the obtaining of the target power corresponding to each ventilation fan according to the actual rotational speed corresponding to the initial power of each ventilation fan, the standard rotational speed corresponding to the initial power of each ventilation fan, and the influence factor of effective operation of each ventilation fan includes:
for any ventilator:
acquiring the actual rotating speed of the ventilator when working at the corresponding initial power; acquiring a standard rotating speed corresponding to the initial power;
calculating the working state index of the ventilation fan according to the actual rotating speed and the standard rotating speed;
judging whether the working state of the ventilation fan when the ventilation fan works at the initial power is effective or not according to the working state index of the ventilation fan, and if the working state of the ventilation fan is effective, taking the initial power as the target power corresponding to the ventilation fan; and if the target power is invalid, obtaining the target power corresponding to the ventilation fan according to the influence factor of the effective work of the ventilation fan.
Preferably, the operating state index of the ventilator is calculated by the following formula:
wherein K is the working state index of the ventilator, V P Is the actual rotating speed V of the ventilator working at the initial power std Sign () is a sign function for the standard rotation speed corresponding to the initial power.
Preferably, the target power corresponding to the ventilator is calculated by the following formula:
wherein, P 1 For the target power corresponding to the ventilator, Min () is the minimum function, P is the initial power of the ventilator, P 0 Is rated power, U, corresponding to the ventilator k Sigma is an adjustment parameter for an influence factor of effective operation of the ventilator.
The invention has the following beneficial effects: the method includes the steps that environment indexes of all sub-areas in the pigsty are obtained, and considering that the longer the using time of the ventilating fans is, the larger the abrasion degree is possibly, the normal work of the ventilating fans can be influenced to a certain extent; then calculating the required intensity of ventilation of each subregion at the current moment according to the temperature, the humidity and the ammonia concentration corresponding to each subregion at the current moment; classifying the subregions in the piggery according to the ventilation and ventilation demand strength of each subregion at the current moment to obtain each target region; then judging whether each target area needs ventilation or not; and calculating the target power of each ventilator corresponding to any target area needing ventilation. According to the invention, the target power corresponding to each ventilation fan is obtained according to the different air exchange and ventilation requirements of different areas in the pigsty in consideration of different air exchange and ventilation requirements of different areas, and the corresponding ventilation fan is adjusted by utilizing the target power, so that a better air exchange and ventilation effect can be achieved, and the environment in the pigsty is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions and advantages of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for efficiently controlling a ventilation fan of a pigsty according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be made on a method for efficiently controlling a ventilator of a pigsty according to the present invention with reference to the accompanying drawings and preferred embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The following describes a specific scheme of the efficient control method of the pigsty ventilation fan provided by the invention in detail by combining with the attached drawings.
Embodiment of high-efficiency control method of pigsty ventilation fan
The existing method has the problem of inaccurate adjustment when the power of each ventilation fan in the pigsty is adjusted. In order to solve the above problems, the present embodiment provides a method for efficiently controlling a ventilation fan of a pigsty, and as shown in fig. 1, the method for efficiently controlling the ventilation fan of the pigsty of the present embodiment includes the following steps:
step S1, acquiring environment indexes of each subregion in the pigsty, wherein the environment indexes comprise temperature, humidity and ammonia concentration; and calculating the influence factors of the effective work of each ventilation fan at the current moment according to the service time of each ventilation fan, the air pressure corresponding to each subregion at the current moment and the air pressure outside the pigsty at the current moment.
Ventilation in the pig house is of vital importance considering that the environment in the pig house is an important factor affecting the growth rate of the pigs, the quality of the meat and the reproduction of the pigs. The pigsty is a large space, in order to accurately know the environmental indexes inside the pigsty, n temperature sensors, n humidity sensors, n ammonia sensors and n barometers are arranged inside the pigsty, in order to obtain the environmental conditions of different areas inside the pigsty, the pigsty is divided into n sub-areas, each sub-area is internally provided with one temperature sensor, one humidity sensor, one ammonia sensor and one barometer, the temperature sensors, the humidity sensors, the ammonia sensors and the barometers are arranged at the central positions of the sub-areas, but the normal activities of pigs are not affected, wherein the temperature sensors are used for collecting the temperature of the sub-areas inside the pigsty; the humidity sensor is used for acquiring the humidity of each subarea in the pigsty; according to an electrochemical principle, an ammonia gas sensor (ME3-NH3) utilizes the fact that the measured gas generates corresponding redox reaction on a sensor working electrode and a sensor counter electrode and releases charges, current is formed through an external circuit, the current is in direct proportion to the gas concentration, and therefore quantitative measurement of target gas is achieved; the barometer is used for collecting the air pressure of each subregion in the pig house. In order to obtain the air pressure difference between the inside and the outside of the pigsty, an air pressure meter is arranged outside the pigsty and used for collecting the air pressure outside the pigsty; then, calculating the air pressure difference between each sub-area inside the pigsty and the outside of the pigsty, wherein the calculation mode of the air pressure difference is as follows: the temperature collected by each barometer inside the pigsty subtracts the air pressure outside the pigsty, if the difference is not zero, the difference indicates that the corresponding area inside the pigsty and the outside of the pigsty can form air pressure difference, and the air pressure difference can influence the normal work of the ventilation fan to a certain extent. In a specific application, the number and the positions of the temperature sensor, the humidity sensor, the ammonia gas sensor and the barometer are set by an implementer.
In order to ensure the smooth air inside the pigsty, a ventilation fan is generally adopted for ventilation, and the ventilation fan for the pigsty mainly plays a role in pumping out dirty air in the pigsty and discharging heat and peculiar smell in the pigsty. If natural wind occurs, the main reason for forming the natural wind is that the air pressure inside and outside the pigsty is different, so that the normal work of the ventilation fan is influenced, and less power resources and more power resources are possibly needed when the corresponding air quantity needs to be discharged; the longer the ventilator is in use, the higher the wear of the ventilator may be, affecting the obstruction positively and the excitation negatively. In this embodiment, based on the usage time of each ventilation fan and the air pressure difference between each sub-area in the pigsty and the pigsty at the current time, the influence factor of the effective operation of each ventilation fan at the current time is calculated, that is:
wherein U is an influence factor of effective operation of any ventilator at the present moment, Δ P is a difference between the sub-area corresponding to the ventilator and the air pressure outside the pig house, tanh () is a hyperbolic tangent function, arctan () is an arc tangent function, t is the use time of the ventilator, t is a unit of day, sign () is a sign function, α is a first correction coefficient, the hyperbolic tangent function is introduced into the formula for calculating the influence factor for normalization, the arc tangent function is also for normalization, and the sign function is for changing the influence mode of wear, when the air pressure difference is positive (delta P >0), the air pressure of the sub-area in the pigsty is higher than the air pressure outside the pigsty, the air in the pigsty should be discharged outwards, but the abrasion of the ventilator can prevent the ventilator from exhausting outwards to a certain extent, so that the abrasion effect has negative influence on the normal work of the ventilator, and the value corresponding to the sign function is-1; when the air pressure is negative (delta P is less than 0), the air pressure of the sub-area in the piggery is lower than the air pressure outside the piggery, and the abrasion of the ventilating fan can prevent the ventilating fan from exhausting outwards to a certain extent, so that the abrasion effect has positive influence on the normal work of the ventilating fan, and the value corresponding to the sign function is 1. The sub-area corresponding to the ventilation fan is the sub-area closest to the ventilation fan. The embodiment sets the value of α to 0.12, which the implementer sets by himself in a specific application.
In the embodiment, based on the air pressure difference between each sub-area in the pigsty and the outside of the pigsty at the current moment and the service time of each ventilating fan, the influence factors of the effective work of each ventilating fan at the current moment are obtained. If the value of U is less than 0, the normal work of the ventilator is hindered due to abrasion; if the value of U is greater than 0, the wear causes the normal operation of the ventilator to be excited.
Step S2, calculating the ventilation requirement intensity of each subregion at the current time according to the temperature corresponding to each subregion at the current time, the humidity corresponding to each subregion at the current time and the ammonia concentration corresponding to each subregion at the current time; classifying the subregions in the piggery according to the ventilation and ventilation demand strength of each subregion at the current moment to obtain each target region; and judging whether each target area needs ventilation according to the ventilation requirement strength of each sub-area in each target area.
This embodiment obtains the inside standard temperature of pig house, the inside standard humidity of pig house and the inside standard ammonia concentration of pig house from the database, then according to the temperature, humidity and the ammonia concentration that each subregion of present moment corresponds, calculates the demand intensity that each subregion of present moment ventilated, promptly:
wherein I is the required intensity of ventilation of any sub-area at the current moment, exp () is a power exponent with the base number of e, Max () is a maximum function, beta is a second correction coefficient, W now For the humidity corresponding to the sub-area at the present moment, W std Is the standard humidity, T, in the pigsty now For the temperature, T, corresponding to the sub-region at the present moment std Is the standard temperature in the pigsty, N now The ammonia gas concentration, N, corresponding to the subregion at the current moment std Is the standard ammonia concentration in the pigsty. In a specific application, the value of β is set by the implementer.
When gathering the inside environmental index of each subregion of pig house, the distribution of sensor is more even, and this embodiment is based on the demand strength of each subregion ventilation, adopts cold and hot point analysis's method to carry out space clustering with ventilation's demand strength, and wherein, the used parameter of cold and hot point analysis is: 1. the conceptual mode is an inverse distance model, the distance calculation method is Euclidean distance, the space weight matrix is standardized, and other defaults are carried out; 2. the reverse distance model is a common model in cold and hot spot analysis and is a known technology; 3. the spatial weight matrix is determined by the minimum value of the sum of the distances from each point sensor in the pigsty to any two ventilation openings, namely the final spatial weight matrix is distributed in a way that the middle value is high and the edge value is low. Ultimately, the data set described above will return relevant parameters, including score, confidence of the current score, etc. One score for each sub-region. Obtaining each target area in the pigsty according to the ventilation and ventilation requirement intensity, wherein each target area comprises one or more sub-areas, the ventilation and ventilation requirement intensity of the sub-areas in each target area is similar, and the distance between the sub-areas in each target area is similar. The cold-hot spot analysis method is prior art and will not be described herein.
The present embodiment sets a first threshold and a second threshold, where the first threshold is greater than 0 and the second threshold is less than 0. If the scores of all the sub-areas in a certain target area are larger than the first threshold, the target area is surrounded by high values, high-value clusters are presented, and therefore distribution characteristics of regional space aggregation with high ventilation and ventilation requirements are formed; if the scores of all the sub-areas in a certain target area are smaller than a second threshold value, the target area is surrounded by low values, low-value clustering is presented, and the target area is a regional space clustering distribution characteristic with lower ventilation and ventilation requirements; if the score of a certain target area is close to 0 (namely the score is greater than or equal to a second threshold and less than or equal to a first threshold), then the requirement intensity of ventilation of all sub-areas in the target area at the current moment needs to be considered, and if the requirement intensity of ventilation of all the sub-areas in the target area is less than or equal to 1, the piggery environment of the target area at the current moment is normal; if the intensity of the requirement of ventilation of the sub-area in the target area is greater than 1, the data measured by the sensor in the target area at the current moment is judged to meet the ventilation requirement, at the moment, the target area is judged to need ventilation, and the ventilation fan corresponding to the area is called to work. In this embodiment, the first threshold is 2.58, the second threshold is-2.58, and in a specific application, the implementer can set the first threshold and the second threshold by himself.
The embodiment adopts a cold and hot spot analysis mode, carries out spatial clustering on the ventilation and ventilation demand intensity, and determines the regions with higher and lower ventilation and ventilation demand intensity at the current moment, namely determines the target region needing ventilation and ventilation in the pigsty.
Step S3, for any target area requiring ventilation: calculating the initial power of each ventilation fan corresponding to the target area according to the maximum value of the required intensity of ventilation in the target area; and obtaining the target power corresponding to each ventilation fan according to the actual rotating speed corresponding to the initial power of each ventilation fan, the standard rotating speed corresponding to the initial power of each ventilation fan and the influence factors of the effective work of each ventilation fan.
When the target area has higher ventilation requirement intensity, the ventilation fan nearby needs to be moved to work.
For any target area requiring ventilation:
acquiring the distance between the sub-area (i.e. the position of the sensor) corresponding to the maximum value of the required intensity in the target area and each of the ventilators, and calculating the initial power of each of the ventilators corresponding to the target area according to the distance between the sub-area corresponding to the maximum value of the required intensity of ventilation in the target area and each of the ventilators and the maximum value of the required intensity of ventilation in the target area, namely:
wherein, P is the initial power of any ventilator corresponding to the target area, P 0 Is the rated power of the ventilator, I Max Maximum value of the intensity of the demand for ventilating the sub-areas in the target area, D Max The distance, gamma, between the ventilator and the sub-area corresponding to the maximum value of the intensity of the ventilation demand in the target area 1 Is a third correction coefficient, γ 2 For the fourth correction coefficient, exp () is a power exponent with a base e. This embodiment sets γ 1 ＝0.3，γ 2 0.2, in a specific application, γ 1 And gamma 2 The value of (c) is set by the implementer.
In this embodiment, whether the operating state of the ventilation fan when operating based on the initial power is an effective operating state is determined. Specifically, in the state of no natural wind, the relationship between the rotating speed and the fan power of the ventilator of the current specification is determined, namely the rotating speed of the ventilator under each power condition is determined, and thus a database of the corresponding relationship between the power and the rotating speed is constructed. The power detection and the rotating speed detection are known technologies, and can be directly obtained by using a ventilator rotating speed and torque tester, which is not described herein again. Then, acquiring the actual rotating speed of the ventilating fans working at the initial power, and calculating the working state indexes of the ventilating fans according to the rotating speed and the actual rotating speed obtained in the database, namely:
wherein K is the working state index of any ventilator, V P Is the actual rotating speed V of the ventilator working at the initial power std Sign () is a sign function, which is a standard rotation speed corresponding to the initial power (i.e., a rotation speed corresponding to the initial power obtained in the database). If the difference between the actual rotating speed and the rotating speed acquired from the database exceeds 3%, the numerical value in parentheses in the symbolic function is less than 0, and the working state index of the ventilator is-1 at the moment, the ventilator is judged not to be in the effective working state; and if the difference between the actual rotating speed and the rotating speed acquired from the database is less than 3%, the numerical value in brackets in the symbolic function is greater than 0, and the working state index of the ventilation fan is 1 at the moment, judging that the ventilation fan is in the effective working state.
For the ventilator, the change of the rotation speed (the actual rotation speed is not consistent with the rotation speed acquired in the database) indicates that other factors near the ventilator affect the power of the ventilator, that is, whether the rotation speed is slow (in this case, the ventilator blows outward, but external wind blows inward or mechanical abrasion forms a certain resistance due to long service time) or the rotation speed is fast (in this case, the ventilator blows outward, and internal wind blows outward to form auxiliary power), it indicates that other factors near the ventilator affect the power of the ventilator. If the ventilating fan is in an effective working state, the initial power is used as the target power, and the corresponding ventilating fan is adjusted by using the target power; and if the ventilator is not in an effective working state, secondarily adjusting the power of the ventilator to determine the target power of the ventilator. Generally, after the ventilation fan works for a period of time, the negative pressure is formed (the air pressure in the pigsty is smaller than the air pressure outside the pigsty), and the correction of the initial power is triggered, if the ventilation fan is abraded, and the difference between the actual rotating speed and the standard rotating speed is judged to exceed 3% according to the working state index, the correction is also triggered. Therefore, the triggering condition is that whether the rotating speed and the power are correspondingly determined, and even if the internal and external air pressure difference of the pigsty does not exist, the initial power of the ventilation fan can be corrected if the abrasion exceeds a certain degree.
For any ventilator which is not in an effective working state, the corresponding target power is as follows:
wherein, P 1 For the target power corresponding to the ventilator, Min () is the minimum function, P is the initial power of the ventilator, P 0 Is rated power, U, corresponding to the ventilator k For the influence factor of the effective operation of the ventilator, σ is an adjustment parameter, and the value of σ is set to 10 in this embodiment, and in a specific application, the implementer sets the value of σ by himself. When the influence factor U of effective work is small (namely negative number), the influence factor U is represented as the obstruction to the work of the ventilation fan, namely the resistance caused by natural wind blowing inwards or mechanical abrasion exists, and at the moment, the current power needs to be properly improved; when the influence factor U of effective work is larger (positive number), the work of the ventilation fan is stimulated, natural wind blows outwards, the current output power can be properly reduced, and the required exhaust volume can be achieved under lower power.
And obtaining target power corresponding to each ventilating fan in the pigsty, and adjusting the ventilating fans by using the target power corresponding to each ventilating fan. In the actual use process, an implementer should regularly maintain the ventilation fan to reduce the influence of device abrasion, achieve better ventilation effect, improve the living environment of the pig, and simultaneously improve the growth speed of the pig and the quality of pork.
In the embodiment, the environmental indexes of all the subareas in the pigsty are obtained, and considering that the longer the service time of the ventilating fan is, the larger the wear degree is possibly, the normal work of the ventilating fan can be influenced to a certain extent; then calculating the required intensity of ventilation of each subregion at the current moment according to the temperature, the humidity and the ammonia concentration corresponding to each subregion at the current moment; classifying the subregions in the piggery according to the ventilation requirement strength of the subregions at the current moment to obtain target regions; then judging whether each target area needs ventilation or not; and calculating the target power of each ventilator corresponding to any target area needing ventilation. In the embodiment, the different intensity of the ventilation and ventilation requirements of different areas in the pigsty are considered, the target power corresponding to each ventilation fan is obtained according to the intensity of the requirements of the different areas, the corresponding ventilation fans are adjusted by using the target power, the better ventilation and ventilation effect can be achieved, and the environment in the pigsty is effectively improved.
It should be noted that: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A high-efficiency control method of a pigsty ventilation fan is characterized by comprising the following steps:
acquiring environmental indexes of each subregion in the pigsty, wherein the environmental indexes comprise temperature, humidity and ammonia concentration; calculating the influence factors of the effective work of each ventilating fan at the current moment according to the use time of each ventilating fan, the air pressure corresponding to each subregion at the current moment and the air pressure outside the pigsty at the current moment;
calculating the ventilation and ventilation requirement intensity of each subregion at the current moment according to the temperature corresponding to each subregion at the current moment, the humidity corresponding to each subregion at the current moment and the ammonia concentration corresponding to each subregion at the current moment; classifying the subregions in the piggery according to the ventilation requirement strength of the subregions at the current moment to obtain target regions; judging whether each target area needs ventilation or not according to the ventilation requirement strength of each subarea in each target area;
for any target area requiring ventilation: calculating the initial power of each ventilation fan corresponding to the target area according to the maximum value of the required intensity of ventilation in the target area; and obtaining the target power corresponding to each ventilation fan according to the actual rotating speed corresponding to the initial power of each ventilation fan, the standard rotating speed corresponding to the initial power of each ventilation fan and the influence factors of the effective work of each ventilation fan.
2. The method according to claim 1, wherein the calculating the influence factor of the effective operation of each ventilation fan at the current time according to the usage time of each ventilation fan, the air pressure corresponding to each sub-area at the current time and the air pressure outside the pigsty at the current time comprises:
for any sub-region: calculating the air pressure difference between the subregion and the outside of the pigsty at the current moment according to the air pressure corresponding to the subregion at the current moment and the air pressure outside the pigsty at the current moment;
and calculating the influence factors of the effective work of each ventilating fan at the current moment according to the air pressure difference between each subarea and the outside of the pigsty and the service time of each ventilating fan at the current moment.
3. The efficient control method for the ventilators used in the pigsty according to claim 2, wherein the following formula is adopted to calculate the influence factors of the effective operation of each ventilator at the current time:
u is an influence factor of effective work of any ventilation fan at the current moment, delta P is the air pressure difference between a sub-region corresponding to the ventilation fan and the outside of the piggery, tanh () is a hyperbolic tangent function, arctan () is an arc tangent function, t is the service time of the ventilation fan, sign () is a sign function, and alpha is a first correction coefficient;
the sub-area corresponding to the ventilation fan is the sub-area closest to the ventilation fan.
4. The efficient control method of the ventilator for pigsty according to claim 1, wherein the required intensity of ventilation of each subarea at the current time is calculated by the following formula:
wherein I is the required intensity of ventilation of any sub-area at the current moment, exp () is a power exponent with the base number of e, Max () is a maximum function, beta is a second correction coefficient, W now For the humidity corresponding to the sub-area at the present moment, W std Is the standard humidity, T, in the pigsty now For the temperature, T, corresponding to the sub-region at the present moment std Is the standard temperature in the pigsty, N now The ammonia gas concentration, N, corresponding to the subregion at the current moment std Is the standard ammonia concentration in the pigsty.
5. The method for efficiently controlling ventilators used in a pigsty according to claim 1, wherein the initial power of each ventilator corresponding to the target area is calculated by the following formula:
wherein, P is the initial power of any ventilator corresponding to the target area, P 0 To changeRated power of air fan, I Max Maximum value of the intensity of the demand for ventilating the sub-areas in the target area, D Max The distance, gamma, between the ventilator and the sub-area corresponding to the maximum value of the intensity of the ventilation demand in the target area 1 Is a third correction coefficient, γ 2 For the fourth correction coefficient, exp () is a power exponent with a base e.
6. The method according to claim 1, wherein obtaining the target power corresponding to each ventilator according to the actual rotational speed corresponding to the initial power of each ventilator, the standard rotational speed corresponding to the initial power of each ventilator, and the influence factor of the effective operation of each ventilator comprises:
for any ventilator:
acquiring the actual rotating speed of the ventilator when working at the corresponding initial power; acquiring a standard rotating speed corresponding to the initial power;
calculating the working state index of the ventilation fan according to the actual rotating speed and the standard rotating speed;
judging whether the working state of the ventilation fan when the ventilation fan works at the initial power is effective or not according to the working state index of the ventilation fan, and if the working state of the ventilation fan is effective, taking the initial power as the target power corresponding to the ventilation fan; and if the target power is invalid, obtaining the target power corresponding to the ventilation fan according to the influence factor of the effective work of the ventilation fan.
7. The efficient control method of the ventilator for piggery according to claim 6, characterized by calculating the index of the working state of the ventilator by using the following formula:
wherein K is the working state index of the ventilator, V P Is the actual rotating speed V of the ventilator working at the initial power std Sign () is a sign function for the standard rotation speed corresponding to the initial power.
8. The efficient control method of the ventilator for piggery according to claim 6, wherein the target power corresponding to the ventilator is calculated by the following formula:
wherein, P 1 For the target power corresponding to the ventilator, Min () is the minimum function, P is the initial power of the ventilator, P 0 Is rated power, U, corresponding to the ventilator k Sigma is an adjustment parameter for an influence factor of effective operation of the ventilator.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116686605A (en) * | 2023-08-09 | 2023-09-05 | 山东东普永磁电机有限公司 | Air state control method and equipment based on permanent magnet motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116686605A (en) * | 2023-08-09 | 2023-09-05 | 山东东普永磁电机有限公司 | Air state control method and equipment based on permanent magnet motor |
| CN116686605B (en) * | 2023-08-09 | 2023-10-10 | 山东东普永磁电机有限公司 | Air state control method and equipment based on permanent magnet motor |
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Application publication date: 20220805 |