CN113557967A - Precise local ventilation airflow organization mechanism for livestock breeding house and application of precise local ventilation airflow organization mechanism - Google Patents
Precise local ventilation airflow organization mechanism for livestock breeding house and application of precise local ventilation airflow organization mechanism Download PDFInfo
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K1/00—Housing animals; Equipment therefor
- A01K1/0047—Air-conditioning, e.g. ventilation, of animal housings
- A01K1/0058—Construction of air inlets or outlets in roofs
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K1/00—Housing animals; Equipment therefor
- A01K1/0047—Air-conditioning, e.g. ventilation, of animal housings
- A01K1/0064—Construction of air inlets or outlets in walls
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K1/00—Housing animals; Equipment therefor
- A01K1/0047—Air-conditioning, e.g. ventilation, of animal housings
- A01K1/0076—Arrangement of heaters or heat exchangers
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K1/00—Housing animals; Equipment therefor
- A01K1/01—Removal of dung or urine, e.g. from stables
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K31/00—Housing birds
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K31/00—Housing birds
- A01K31/002—Poultry cages, e.g. transport boxes
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K31/00—Housing birds
- A01K31/04—Dropping-boards; Devices for removing excrement
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
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- Biodiversity & Conservation Biology (AREA)
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Abstract
The invention relates to the field of breeding environment control, and particularly discloses a precise local ventilation airflow organization mechanism of a livestock breeding house and application thereof, wherein the mechanism comprises an air supply component, an air return component and an air exhaust component; the air supply assembly comprises an air supply main pipe, an air supply branch pipe and an air supply outlet, the upper part of the cultivation column is provided with the air supply outlet, and the air supply outlet faces downwards; the air return component comprises an air return main pipe, an air return branch pipe and an air return opening, and the air return opening is arranged in the middle or at the upper part of the cultivation column; the exhaust assembly comprises an exhaust channel and an exhaust outlet, the exhaust channel is arranged on one side or two sides of the septic tank, the exhaust outlet is arranged on the upper portion of the side wall of the septic tank, and the exhaust channel is communicated with the septic tank through the exhaust outlet. According to the invention, through accurate local short-range air supply, air return and air exhaust and scientific and reasonable airflow organization, the ventilation distribution is more uniform, the waste gas backflow is reduced, the concentration of harmful gases in living areas of the livestock is effectively reduced, the isolation effect of the livestock is optimized, the cross contamination and the germ transmission are reduced, and the ventilation quantity and the energy consumption are effectively reduced.
Description
Technical Field
The invention relates to the field of breeding environment control, in particular to a precise local ventilation airflow organization mechanism for a livestock breeding house and application thereof.
Background
With the development of modern breeding industry, centralized large livestock breeding houses are more advanced and efficient, and in order to deal with the reduction of air quality caused by massive intensive breeding and the deterioration of breeding environment, the health and meat quality of livestock are affected, a fresh air system and a ventilation system are applied in large quantities.
However, most of the existing livestock breeding house environment control systems adopt a comprehensive ventilation mode. The technical solution of the overall ventilation has several drawbacks:
1. when an air conditioning system is adopted as an environment control mode, the overall ventilation is to control the temperature and the humidity of the whole livestock breeding house space, the requirements on refrigerating capacity and heating capacity are high, and the energy consumption is high;
2. the phenomenon of uneven temperature is easy to occur in the overall ventilated livestock breeding house, the temperature difference of different areas of the livestock breeding house is large, and according to relevant research data, the maximum temperature difference of different areas in the same breeding house can reach 1.9 ℃;
3. the comprehensive ventilation is also called dilution ventilation, and is realized by diluting harmful gas in the whole livestock breeding house by using clean air to ensure that the concentration of the harmful gas meets the environmental control requirement of the livestock breeding house, the requirement on air supply quantity is undoubtedly high, and the energy consumption of a ventilation system is further improved;
4. the harmful gas dilution process of the overall ventilation is unfavorable for disease prevention of the livestock breeding house, and when disease epidemic situation occurs locally in the livestock breeding house, pathogenic bacteria or viruses can be caused to rapidly diffuse in the livestock breeding house along with movement of ventilation airflow, so that the disease infection can be rapidly spread.
In addition, when the existing livestock and poultry breeding house environment control system adopts an air conditioning mode to refrigerate or heat, most of the livestock and poultry breeding house environment control system only has an air supply system and an air exhaust system, but does not have an air return system. Therefore, the air flow organization design only relates to the arrangement of the air supply outlet and the air exhaust outlet, and does not relate to the arrangement of the air return inlet. When the temperature and humidity of the livestock breeding house are controlled, the air treatment energy consumption of the fresh air system is large. The existing energy-saving method is to add a return air treatment system and arrange a return air inlet. However, the existing air return mode of the livestock breeding house adopting the air conditioning system adopts large-space centralized air return, and the air return opening is arranged at one side of the large environment of the livestock breeding house and is actually equivalent to the above-mentioned comprehensive ventilation mode.
The existing livestock breeding house also has the problem that an air supply and exhaust outlet is unreasonably arranged, scientific airflow organization design is not carried out, airflow organizations are disordered, and airflow easily flows to a livestock living breathing area from a polluted area, so that the air quality of a local environment for breeding is deteriorated, the health of livestock is affected, and diseases of livestock are easily caused. Particularly, after epidemic situations such as avian influenza, African swine fever and the like are spread on a large scale in recent years, the existing farms are changed into a mode of small-compartment separated cultivation, so that the original large-scale ventilation effect is further reduced.
The existing farm generally adopts a partition fence and a positioning fence which are mutually isolated to carry out isolated feeding on the livestock, the partition fence generally isolates and scatters one or more livestock or poultry in a small partition surrounded by three surfaces by partition walls, so that the livestock or poultry can move, rest and eat in the partition fence, and excrement, urine and waste gas leak into a septic tank below through a leak floor below the partition fence to be discharged; for the poultry and livestock such as egg laying poultry, livestock to be laid, lactating livestock and the like, the positioning fence is required to fix the poultry and livestock so that the poultry and livestock cannot turn or move freely, the head part of the poultry and livestock is just opposite to the feeding trough, a leaking floor is arranged below the tail part of the poultry and livestock, a septic tank is arranged below the leaking floor and used for leaking and discharging excrement and urine, and the side surface of the poultry and livestock can be provided with a small compartment for feeding the lactating livestock.
Disclosure of Invention
The invention provides a precise local ventilation airflow organization mechanism of a livestock breeding house and application thereof, aiming at overcoming the existing problems that the energy consumption of the existing livestock breeding environment control technology is high, waste gas is easy to flow back to a livestock living area, the whole air quality of the livestock living area is poor after fresh air and the waste gas are mixed, and the like.
The technical scheme adopted by the invention is as follows: an accurate local ventilation airflow organization mechanism of a livestock breeding house comprises a plurality of breeding columns, a slotted floor and a septic tank are arranged below the breeding columns, and the mechanism also comprises an air supply component, an air return component and an air exhaust component;
the air supply assembly comprises at least one air supply main pipe, a plurality of air supply branch pipes and a plurality of air supply outlets, the air supply main pipe is used for inputting fresh air or mixed air of the fresh air and processed return air into the livestock breeding house, the upper part of each breeding column is provided with at least one air supply outlet, the air supply outlet faces downwards, and the air supply outlet is communicated with the air supply main pipe through the air supply branch pipes;
the air return component comprises at least one air return main pipe, a plurality of air return branch pipes and a plurality of air return ports, the air return main pipe is used for extracting air return air of the livestock breeding house, the middle part or the upper part of each breeding column is provided with at least one air return port, and the air return ports are communicated with the air return main pipe through the air return branch pipes;
the subassembly of airing exhaust includes at least one air exhaust passageway and a plurality of air exit, the air exhaust passageway is used for the extraction and discharges the waste gas in the birds poultry breeds house, the air exhaust passageway is located manure pit one side or both sides, manure pit lateral wall upper portion is located to the air exit, the air exhaust passageway with the manure pit passes through the air exit is linked together.
Preferably, the air return opening faces to the middle of the cultivation column.
Preferably, the exhaust outlet is arranged along the upper part of one side or two sides of the side wall of the septic tank and is higher than the liquid level of the septic tank.
Preferably, the air outlet is one of at least one hole or at least one strip-shaped slit or a combination thereof.
Preferably, the percentage of the total area of the cross section of the air outlet to the total area of the single side wall of the septic tank of the single cultivation column is 0.1-9.5%.
Preferably, the height of the air supply opening from the leaky floor is not higher than 2.5 times of the maximum height of the livestock and is higher than the height of the livestock, and the height of the center of the air return opening is not higher than the height of the livestock and is one seventh higher than the height of the livestock.
Preferably, the exhaust channel is a trench or a duct.
The utility model provides an accurate local ventilation air current organizational structure in house is bred to birds poultry, contains compartment fence and the accurate local ventilation air current organizational structure in above-mentioned birds poultry breed house, and it is single the compartment fence is equipped with two return air inlet and one the supply-air outlet, two the return air inlet is located the both sides middle part on compartment fence, one the supply-air outlet is located the top at breed column middle part.
The utility model provides an accurate local ventilation air current organizational structure of house location fence is bred to birds poultry, contains location fence and the accurate local ventilation air current organizational structure of above-mentioned birds poultry breed house, and its is single the compartment fence is equipped with one the supply-air outlet, one the top of birds poultry is located to the supply-air outlet.
The utility model provides an accurate local ventilation air current organizational structure of suckling domestic animal location fence, contains suckling location fence and the accurate local ventilation air current organizational structure of above-mentioned poultry breeding house, its single be equipped with two at least in the suckling location fence the return-air inlet with at least two supply-air outlet, one the supply-air outlet is located female suckling domestic animal top, at least one the supply-air outlet is located the top in pup district, at least two the return-air inlet branch is located the both sides of suckling location fence.
The invention has the beneficial effects that:
(1) the short-range local air supply outlet, the air return opening and the air exhaust opening which are accurately arranged in the livestock living area form the air supply outlet → the livestock living area → the leaky floor → the septic tank → the air exhaust opening and the air supply outlet → the livestock living area → the air return opening, so that the situation that waste gas flows back to the livestock living area from the bottom septic tank or the excrement polluted area is effectively reduced; the scientific and reasonable airflow organization and environmental control of the livestock are realized, so that the livestock can breathe fresh air at the first time, and the backflow of waste gas is reduced;
(2) the air supply speed and the air speed of the living areas of the livestock can be better controlled, so that the temperature distribution is more uniform, the thermal comfort of the living areas of the livestock can be more effectively ensured, and the thermal stress of the livestock is reduced;
(3) the mixing amount and the mixing range of the surrounding air flow can be effectively reduced, the pathogenic bacteria particles are controlled in a certain area, the probability of cross infection is greatly reduced, the disease incidence of the livestock can be effectively reduced, and the breeding efficiency of the livestock can be improved;
(4) the precise short-range local air supply (fresh air or mixed air of the fresh air and return air) is adopted, only the temperature reduction or heating of the living areas of the livestock is required to be ensured, compared with the large environment, the investment of the refrigerating capacity or the heating capacity of the environment temperature control system is greatly reduced, and the operation energy consumption of the environment control system is effectively saved;
(5) by adopting the side return air, part of the air flow flows into the return air inlet in short distance after passing through the living area of the livestock, so that the temperature and enthalpy of the return air can be close to the temperature and enthalpy of the air supply as much as possible, and the energy consumption of heat and humidity treatment of the air return fan unit is effectively reduced;
(6) the method is beneficial to installation and construction, convenient to construct and low in manufacturing cost. .
Drawings
FIG. 1 is a schematic view of the overall layout of the livestock breeding house of the present invention;
FIG. 2 is a three-dimensional schematic view of a stall of the present invention;
FIG. 3 is a side view of the stall of the present invention;
FIG. 4 is a cross-sectional air flow organization simulation side view of a single stall bar;
FIG. 5 is a cross-sectional flow pattern simulated top view of a single compartment bar;
FIG. 6 is a tissue simulation diagram of polluted air flowing back to the culture area from the bottom septic tank through the leaky floor;
FIG. 7 is a simulated side view of the double-sided exhaust embodiment of the present invention;
FIG. 8 is a simulated top view of a double-sided exhaust embodiment of the present invention;
FIG. 9 is a front view of a simulation of a double-sided exhaust embodiment of the present invention;
FIG. 10 is a simulated three-dimensional view of a double-sided exhaust embodiment of the present invention;
FIG. 11 is a trench slot exhaust simulation of the embodiment of the present invention in which double-sided exhaust is implemented;
FIG. 12 is a simulated side view of one embodiment of the exhaust of the present invention;
FIG. 13 is a simulated top view of one embodiment of the exhaust of the present invention;
FIG. 14 is a front view of a simulation of one embodiment of the present invention in which the exhaust is unilateral;
FIG. 15 is a simulated three-dimensional view of one-sided venting embodiment of the present invention;
FIG. 16 is a trench slot exhaust simulation of one embodiment of the present invention in which the exhaust is unilateral;
FIG. 17 is a schematic view of the upper return air opening ventilation system of the present invention;
FIG. 18 is a three-dimensional view of an upper return air inlet simulation model of the present invention;
FIG. 19 is a diagram of an overall simulation of the layout of the upper return air inlet of the present invention;
FIG. 20 is a cross-sectional view of the upper return air inlet layout of the present invention;
FIG. 21 is a simulation diagram of the layout of the upper return air inlet of the present invention.
In the figure: 1. a main air supply pipe; 2. a return air main pipe; 3. an air supply branch pipe; 4. an air return branch pipe; 5. an air supply outlet; 6. an air return opening; 7. a slatted floor; 8. an air exhaust channel; 9. an air outlet; 10. a septic tank; 11. a poultry and livestock product is provided.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Referring to fig. 1 to 21, the invention relates to a precise local ventilation airflow organization mechanism of a livestock breeding house and application thereof, which is used for fresh air ventilation of a compartment fence and a positioning fence and comprises a plurality of breeding columns, an air supply assembly, an air return assembly and an air exhaust assembly, wherein a slotted floor 7 and a septic tank 10 are arranged below the breeding columns.
The air supply assembly comprises at least one air supply main pipe 1, a plurality of air supply branch pipes 3 and a plurality of air supply outlets 5, the air supply main pipe 1 is used for inputting fresh air or mixed air of the fresh air and processed return air into the livestock breeding house, at least one air supply outlet 5 is arranged on the upper portion of each breeding column, the air supply outlet 5 faces downwards, and the air supply outlet 5 is communicated with the air supply main pipe 1 through the air supply branch pipes 3.
The air return component comprises at least one air return main pipe 2, a plurality of air return branch pipes 4 and a plurality of air return openings 6, the air return main pipe 2 is used for extracting air return air of the livestock breeding house, the middle part or the upper part of each breeding column is provided with at least one air return opening 6, and the air return openings 6 are communicated with the air return main pipe 2 through the air return branch pipes 4.
The exhaust assembly comprises at least one exhaust channel 8 and a plurality of exhaust outlets 9, the exhaust channel 8 is used for extracting and discharging waste gas in the livestock breeding house, the exhaust channel 8 is arranged on one side or two sides of the septic tank 10, the exhaust outlets 9 are arranged on the upper portion of the side wall of the septic tank 10, and the exhaust channel 8 is communicated with the septic tank 10 through the exhaust outlets 9.
Taking a pig farm as an example, the design advantage of the scheme is as follows:
1. compared with the comprehensive air supply of a farm, the short-range accurate local air supply only needs to cool or heat and supply fresh air to a pig raising area (generally within 2 meters away from the ground), does not need to carry out temperature and humidity regulation on a large space of the whole breeding house, greatly reduces the investment of refrigerating capacity or heating capacity, effectively saves the operation energy consumption of an environment control system, and improves the temperature control efficiency;
2. the short-range precise local air supply mode is adopted, air is directly sent into the pig raising area, so that the temperature distribution of the pig raising area is uniform (simulation experiments and actual measurement show that the maximum temperature difference at each point is not more than 0.8 ℃), in addition, the short-range precise local air supply can better control the air supply speed and the air speed of the pig raising area, and the sensible temperature of a swinery is further effectively reduced; the method is difficult to achieve in a comprehensive ventilation mode (for example, in order to ensure the cooling effect of a wet curtain, a wet curtain-fan system can control the air speed of the over-curtain, so that the air speed in the house is lower), so that the accurate local air supply with short range can more effectively ensure the thermal comfort of a pig raising area and reduce the thermal stress of pigs;
3. the short-range accurate local air supply directly supplies fresh air to the pig raising area, so that the air quality of the pig raising area can be ensured, the sanitary condition of pig raising is maintained, and the incidence rate of diseases is reduced;
4. researches show that accurate local air circulation with short range and uniform airflow effectively reduce the mixing amount and mixing range of surrounding airflow, pathogenic bacteria and virus particles are controlled in a certain area, and the probability of cross diffusion is greatly reduced.
Preferably, the return air opening 6 is directed horizontally towards the live zone of the poultry farm.
Preferably, the exhaust port 9 is positioned along an upper portion of one side or both sides of the sidewall of the septic tank 10, higher than the liquid level of the septic tank 10, to prevent the liquid manure inside the septic tank 10 from flowing into the exhaust passage 8 through the exhaust port 9.
Preferably, the air outlet 9 is one of at least one hole or at least one strip-shaped slit or a combination thereof.
Preferably, the percentage of the total area of the cross section of the air outlet 9 in the total area of the single side wall of the septic tank 10 of the single cultivation column is in the range of 0.1% to 9.5%.
Preferably, the height of the air blowing opening 5 is not higher than 2.5 times of the maximum height of the livestock 11 and higher than the height of the livestock 11, and the height of the air return opening 6 is not higher than the height of the livestock 11 and higher than one seventh of the height of the livestock 11.
Preferably, the exhaust channel 8 is a trench or a duct.
As a first embodiment of the scheme, the accurate local ventilation airflow organization mechanism for the compartment fence of the livestock breeding house comprises the compartment fence, wherein a single compartment fence is provided with two air return openings 6 and one air supply opening 5, the two air return openings 6 are arranged in the middle of two sides of the compartment fence, and the one air supply opening 5 is arranged above the middle of a breeding column.
As a second embodiment of the scheme, for example, the positioning fence accurate local ventilation airflow organization mechanism is used for laying poultry or livestock in the fat-losing period, for example, a live pig breeding house positioning fence comprises a positioning fence, a single compartment fence is provided with an air supply opening 5, the air supply opening 5 is arranged above a live pig, preferably, the position of the neck is opposite to the single compartment fence, and one or more air return openings 6 can be uniformly distributed in the middle of the side surface.
As a third embodiment of the scheme, the precise local ventilation airflow organization mechanism of the positioning fence for the sows and piglets in the lactation period comprises a lactation positioning fence, wherein three return air openings 6 and two air supply openings 5 are arranged in a single lactation positioning fence, one air supply opening 5 is arranged above the lactating sow, preferably, the position of the neck is opposite to the position of the lactating sow, the two air supply openings 5 are arranged above a suckling area of the cub of the livestock, and the two return air openings 6 are respectively arranged at two sides of the lactation positioning fence.
The following is a fourth embodiment of the present invention, a local ventilation airflow organization mechanism applied to the small environment in the single-pigsty in the compartment type pig farm, and a simulation development process thereof.
Referring to fig. 1 to 3, at first, for more accurate air supply to the pig raising district in, reduce the diffusion waste of air supply in big environment, the accurate local air supply mode of short range is adopted to this embodiment, and supply-air outlet 5 arranges in the pig raising district (generally within 2 meters from ground) the suitable position that is nearer apart from the pig distance in the top, sends clean air supply air current short distance to the pig raising district accurately.
This embodiment adopts and sets up the mode of local return air inlet 6 in the district of raising pigs, realizes directly from the accurate local return air in the district of raising pigs, and return air inlet 6 sets up the middle lower part in the field both sides. The return air inlet 6 adopts a side return air mode facing pigs on two sides (or the return air inlet 6 is arranged upwards and faces the ceiling of the breeding house, and airflow flows into the return air inlet 6 from the upper part). The lowest part of the air return opening 6 is 200mm-300mm away from the floor, and is not less than the height of the air return opening 6. The advantages of this design are:
(1) after part of the air flow passes through the pig raising area to achieve the purpose of environmental control of the pig raising area, the air flow immediately flows into the air return inlet 6 in a short distance in the pig raising area, so that the air return temperature and the enthalpy value can be close to the air supply temperature and the enthalpy value as much as possible, and the energy consumption of heat and humidity treatment of the air return is effectively reduced.
(2) After a part of supplied air flow passes through the pig raising area to achieve the purpose of environmental control of the pig raising area, the supplied air flow immediately flows into the return air inlet 6 in a short distance in the pig raising area, so that the probability of pollution of the air flow and the mixing amount of pollutants can be reduced, the air quality of the return air flow is improved, and the purification technology threshold of the return air flow is reduced.
(3) The air return opening 6 is arranged at the middle lower part of the junction of the two breeding columns, and the air return opening 6 adopts a side air return mode facing pigs on two sides (or the air return opening 6 is arranged upwards and faces the ceiling of the breeding house, and airflow flows into the air return opening 6 from the upper part). The lowest part of the air return opening 6 is 200mm-300mm away from the floor, and is not less than the width of the air return opening 6. The negative pressure generated by the air return opening 6 can prevent polluted air flow in the septic tank 10 from flowing back through the leak floor 7, and the polluted air flows to the pig living area, so that the air quality of the pig living area is not affected.
In the embodiment, an air exhaust mode of passing through the leaking seam floor 7 and the septic tank 10 from the lower part of the pig raising area is adopted. The air outlet 9 is arranged at the upper part of the side wall of the septic tank 10 below the pig raising area. Exhaust outlets 9 are arranged at the upper parts of two sides (or one side) of the side wall of the septic tank 10. The moving path of the air flow is as follows: after part of the air flows through the pig raising area, the air flows into a lower septic tank 10 through a leak floor 7, and then is discharged to an exhaust channel 8 (an exhaust trench or an exhaust pipe) from exhaust outlets 9 arranged at the upper parts of both sides (or one side) of the side wall of the septic tank 10. CFD (computational fluid dynamics) simulation studies have shown that the advantages of this design are: the air flow can be better ensured to be the unidirectional flow from the pig raising area to the septic tank 10 and then to the air outlet 9 through the slotted floor 7, thereby better preventing the polluted air flow in the septic tank 10 from flowing to the pig living area through the slotted floor 7, better ensuring the air quality of the living area of the live pigs, maintaining the sanitary condition of pig breeding and reducing the incidence rate of diseases.
According to the prior literature data and the related technical data which are consulted and searched, and the solution is deduced according to the problems existing in the prior art, the ventilation air flow organization of the breeding house is preliminarily designed, and the air supply and exhaust openings 9 are redesigned and arranged.
Referring to fig. 4 to 16, the simulation method is implemented as follows:
s1, establishing a three-dimensional geometric model of the solution for simulation analysis research;
s2, establishing a CFD (computational fluid dynamics) numerical analysis model, which comprises the work of mesh division of a fluid domain, definition of boundary conditions, selection of a physical model and the like;
s3, CFD numerical analysis experiment; analyzing the analysis result to find unreasonable places of airflow organization, such as the situation that polluted airflow flows back to the living area of the livestock 11 from the bottom septic tank 10 through the leaking floor 7;
and S4, improving the design, rearranging the design layout of the air supply outlet 5, the air exhaust outlet 9 and the air return inlet 6, and repeating the steps 1 to 4 until the optimal airflow organization design is obtained.
Finally, the optimized air flow structure design and the design arrangement of the air supply outlet 5, the air return inlet 6 and the air exhaust outlet 9 are obtained.
Referring to fig. 7 to 11, as a fifth embodiment of the present invention, a geometric model (double-sided exhaust) of a CFD numerical simulation experiment is shown, and the air flow tissue velocity distribution is shown in the figure, and after the design arrangement of the air supply opening 5, the air return opening 6 and the air exhaust opening 9 is optimized, a one-way air flow from the air supply opening 5 → the slotted floor 7 → the septic tank 10 → the air exhaust opening 9 is formed, so that the situation that the polluted air flows from the bottom septic tank 10 to the living area of the poultry 11 through the slotted floor 7 is effectively prevented.
Referring to fig. 12 to 16, as a sixth embodiment of the present invention, by adopting a design that only one side of the side wall of the septic tank 10 is provided with the air outlet 9, and by establishing a numerical simulation model arranged from the single-side air outlet 9 on the side wall of the septic tank 10, after simulation analysis by simulation software, the arrangement of the single-side air outlet 9 can also effectively prevent the occurrence of polluted air flow from flowing back from the bottom septic tank 10 to the living area of the livestock 11 through the leak floor 7.
Referring to fig. 17 to 21, which are seventh embodiments of the present invention, the return air inlet 6 is arranged at one side of the upper part of the cultivation column, the return air inlet 6 is communicated with the return air main pipe 2 through the return air branch pipe 4, and after simulation analysis, the beneficial effects expected by the above scheme can be achieved.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. The utility model provides an accurate local ventilation air current organizational structure of house is bred to birds poultry, includes that a plurality of breeds the column, breeds column below and is equipped with slotted floor and manure pit, characterized by: the air return device also comprises an air supply assembly, an air return assembly and an air exhaust assembly;
the air supply assembly comprises at least one air supply main pipe, a plurality of air supply branch pipes and a plurality of air supply outlets, the air supply main pipe is used for inputting fresh air or mixed air of the fresh air and processed return air into the livestock breeding house, the upper part of each breeding column is provided with at least one air supply outlet, the air supply outlet faces downwards, and the air supply outlet is communicated with the air supply main pipe through the air supply branch pipes;
the air return component comprises at least one air return main pipe, a plurality of air return branch pipes and a plurality of air return ports, the air return main pipe is used for extracting air return air of the livestock breeding house, the middle part or the upper part of each breeding column is provided with at least one air return port, and the air return ports are communicated with the air return main pipe through the air return branch pipes;
the subassembly of airing exhaust includes at least one air exhaust passageway and a plurality of air exit, the air exhaust passageway is used for the extraction and discharges the waste gas in the birds poultry breeds house, the air exhaust passageway is located manure pit one side or both sides, manure pit lateral wall upper portion is located to the air exit, the air exhaust passageway with the manure pit passes through the air exit is linked together.
2. The precise local ventilation airflow organization mechanism of the livestock breeding house according to claim 1, characterized in that: the air return opening faces to the middle of the cultivation column.
3. The precise local ventilation airflow organization mechanism of the livestock breeding house according to claim 1, characterized in that: the air outlet is arranged along the upper part of one side or two sides of the side wall of the septic tank and is higher than the liquid dung surface of the septic tank.
4. The precise local ventilation airflow organization mechanism of the livestock breeding house according to claim 1, characterized in that: the air outlet is one or a combination of at least one hole or at least one strip-shaped gap.
5. The precise local ventilation airflow organization mechanism of the livestock breeding house according to claim 1, characterized in that: the percentage range of the total area of the cross section of the air outlet in the total area of the single side wall of the septic tank of the single culture column is 0.1-9.5%.
6. The precise local ventilation airflow organization mechanism of the livestock breeding house according to claim 1, characterized in that: the height of the air supply outlet from the leak floor is not higher than 2.5 times of the maximum height of the livestock and is higher than the height of the livestock, and the height of the center of the air return inlet is not higher than the height of the livestock and is one seventh higher than the height of the livestock.
7. The precise local ventilation airflow organization mechanism of the livestock breeding house according to claim 1, characterized in that: the exhaust channel is a trench or a pipeline.
8. The utility model provides an accurate local ventilation air current organizational structure of house compartment fence is bred to birds poultry, characterized by: the precise local ventilation airflow organization mechanism for the livestock breeding house comprises compartment fences and the precise local ventilation airflow organization mechanism in any one of the claims 1 to 7, wherein a single compartment fence is provided with two air return openings and one air supply opening, the two air return openings are arranged in the middle parts of two sides of the compartment fence, and the one air supply opening is arranged above the middle part of the breeding field.
9. The utility model provides an accurate local ventilation air current organizational structure of house location fence is bred to birds poultry, characterized by: a precise local ventilation air flow organization mechanism for a livestock breeding house comprising a location fence and a device as claimed in any one of the preceding claims 1-7, wherein a single location fence is provided with one said air supply opening and one said air supply opening is provided above the fixed livestock.
10. An accurate local ventilation air current organizational structure of suckling domestic animal location fence, characterized by: the precise local ventilation airflow organization mechanism for the livestock breeding house comprises a nursing positioning fence and the precise local ventilation airflow organization mechanism as claimed in any one of the claims 1 to 7, wherein at least two air return openings and at least two air supply openings are arranged in a single nursing positioning fence, one air supply opening is arranged above the position of the female nursing livestock, at least one air supply opening is arranged above a livestock cub area, and at least two air return openings are respectively arranged at two sides of the nursing positioning fence.
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