A convection-diffusion ventilation system for nursery and fattening sheds

Abstract

This utility model discloses a convection-diffusion type ventilation system for nursery and fattening pens, belonging to the field of nursery and fattening pen ventilation technology. It includes a horizontally installed ceiling that divides the interior space of the pen into an air supply zone and a rearing zone. The air supply zone is connected to an air intake channel located in the middle of the pen, and the rearing zone is connected to negative pressure fans located at the front and rear ends of the pen. Below the ceiling are several vertical ducts connecting the air supply zone and the rearing zone. All vertical ducts are located above the pens within the rearing zone, and the outlets of all vertical ducts face the solid floor used to separate adjacent manure ditches inside the pens. Underfloor heating is installed inside the solid floor. This ventilation system, through its zoned air supply and direct floor blowing airflow design, combined with the natural convection effect of the pigs' heat source, solves the problems of uneven ventilation, moisture and harmful gas accumulation in traditional pigsties, improves the uniformity of air quality inside the pen, and ensures the health of the pig herd.

Description

Technical Field

[0001] This utility model relates to the field of ventilation technology for nursery and fattening sheds, specifically a convection diffusion ventilation system for nursery and fattening sheds. Background Technology

[0002] Large-scale pig farming is the core model for ensuring a stable supply of modern meat protein. Its production efficiency is closely related to the level of environmental control, especially the quality of ventilation in the pigsty. In current practice, vertical ventilation is widely used in modern pigsties because it can create a uniform airflow organization from top to bottom or bottom to top, effectively avoiding ventilation dead zones.

[0003] One of the more common solutions is to use small windows in the ceiling for ventilation. However, the airflow distribution is easily affected by the layout of the pigsty and the external climate. The following problems are likely to occur in fattening and nursery pens: First, the airflow organization is disordered, which can easily form ventilation dead zones, leading to the accumulation of local moisture (such as evaporation from manure ditches and pig excrement) and harmful gases (ammonia, hydrogen sulfide, etc.). Second, cold air blowing directly onto the pigs can easily trigger stress reactions, especially when piglets in the nursery stage have weak cold resistance. Third, when there is a large temperature difference between the ground and the air, reverse airflow is easily generated (such as cold and humid air rising from the ground in winter), which interferes with normal ventilation efficiency. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a convection diffusion ventilation system for nursery and fattening pens. Through the airflow organization design of zoned air supply and direct airflow to the ground, combined with the natural convection effect of the pig's body heat source, it solves the problems of uneven ventilation, accumulation of moisture and harmful gases in traditional pig pens, improves the uniformity of air quality in the pens, and ensures the health of the pig herd.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A convection-diffusion ventilation system for nursery and fattening sheds includes a suspended ceiling horizontally installed on the top of the shed, which divides the interior space of the shed vertically into an air supply area and a breeding area. The air supply area is connected to an air intake channel located in the middle of the shed, and the breeding area is connected to negative pressure fans located at the front and rear ends of the shed. Its core design is that: several vertical air ducts are installed below the suspended ceiling to connect the air supply area and the breeding area. All vertical air ducts are located above the pens in the breeding area, and the air outlets of all vertical air ducts face the solid floor used to separate two adjacent manure ditches inside the pens. The solid floor is covered with underfloor heating.

[0006] By adopting the above scheme, the air supply area and the breeding area are divided by the ceiling. Fresh air first enters the air supply area for pre-cooling or pre-heating, avoiding direct impact of external fresh air on the pigs. In winter, vertical air ducts blow air directly to the solid ground, which, combined with the rising airflow generated by the underfloor heating (the pigs themselves are also a heat source), forms a natural convection path of "ground air supply - heat source lifting - top exhaust", significantly improving airflow efficiency. In summer, the vertical air ducts deliver low-temperature fresh air to the ground, which combines with the rising airflow from the pigs' heat source to enhance convection cooling. Secondly, the direct airflow from the ground accelerates the evaporation of moisture near the manure ditch, carrying moisture and harmful gases (such as ammonia) to the roof area with the rising airflow, and finally exhausting them by the negative pressure fan, reducing the concentration of pollutants in the breeding area.

[0007] As a preferred embodiment of a convection diffusion-type nursery and fattening house ventilation system, an air duct extending along the length of the house is provided in the air supply area, and an air duct outlet is opened at the bottom of the air duct, so that fresh air from outside can be evenly delivered to every place in the air supply area through the air duct.

[0008] As a preferred embodiment of a convection diffusion-type ventilation system for nursery and fattening sheds, a static pressure box connected to the top of the vertical air duct is provided in the air supply area. The top of the static pressure box has a static pressure box air inlet. The static pressure box stabilizes the airflow pressure and ensures uniform airflow from the vertical air duct.

[0009] In a preferred embodiment of a convection-diffusion ventilation system for nursery and fattening sheds, the entrance to the air intake channel is located at its top, and a horizontally installed bird net is installed at the top entrance to prevent birds from entering the air intake channel.

[0010] As a preferred embodiment of a convection-diffusion ventilation system for nursery and fattening sheds, a vertically installed water curtain is also installed outside the bird netting. In summer, the water curtain can be used to evaporate and cool down the air entering the shed, thereby reducing the temperature of the air.

[0011] As a preferred embodiment of a convection diffusion-type nursery and fattening house ventilation system, the exterior of the water curtain is also equipped with a vertically installed three-proof net (dustproof, insectproof, and rainproof) to protect the water curtain and air intake channel from the intrusion of external pollutants.

[0012] As a preferred embodiment of a convection-diffusion ventilation system for nursery and fattening sheds, a manure discharge pipe extending along the width of the shed is installed underground in the breeding area. The manure discharge pipe is connected to the bottom of all manure ditches, and the manure is collected and discharged efficiently through the manure discharge pipe.

[0013] The beneficial effects of this utility model are: 1. Airflow organization optimization: The air supply area and the breeding area are divided by the ceiling. Fresh air first enters the air supply area for pre-cooling or pre-heating to avoid the direct impact of external fresh air on the pigs. In winter, the vertical air duct blows the air directly to the solid ground. Combined with the rising airflow generated by the underfloor heating (the pigs themselves are also a heat source), a natural convection path of "ground air supply - heat source lifting - top exhaust" is formed, which significantly improves the airflow efficiency. In summer, the vertical air duct sends low-temperature fresh air to the ground, which combines with the rising airflow of the pigs' heat source to enhance convection cooling.

[0014] 2. Uniformity of air quality: Vertical air ducts cover the top of all pens, and with the help of static pressure boxes to stabilize the pressure, the air supply to each pen is uniform; negative pressure fans are used for exhaust at the front and rear of the breeding area to eliminate ventilation dead zones.

[0015] 3. Efficient removal of moisture and harmful gases: The direct airflow from the ground accelerates the evaporation of moisture near the manure ditch. Combined with the rising airflow from the pig's body heat source, moisture and harmful gases (such as ammonia) are carried to the roof area by the rising airflow and finally discharged by the negative pressure fan, reducing the concentration of pollutants in the breeding area.

[0016] 4. Multi-functional protection: The multi-layer protection of the air intake channel (bird net, water curtain, and three-proof net) can adapt to different seasonal needs - the water curtain is closed in winter to maintain the temperature, and the water curtain is opened in summer to cool down; the three-proof net intercepts dust, insects and rainwater to ensure clean air intake.

[0017] 5. Energy-saving and efficient: Utilizing natural convection reduces mechanical ventilation energy consumption, and the underfloor heating and ventilation systems work together to reduce winter heating costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the main structure inside the building; Figure 2 This is a top-down structural diagram of the building; Figure 3 A top-view structural diagram of the air supply area inside the building; Figure 4 for Figure 3 A magnified view of a section at point A in the middle; Figure 5 This is a top-down structural diagram of the breeding area inside the shed; Figure 6 for Figure 5A magnified view of a section at point B.

[0020] Attached diagram labels: 1-House; 2-Ceiling; 3-Air inlet duct; 4-Negative pressure fan; 5-Vertical air duct; 6-House pen; 7-Manure ditch; 8-Solid floor; 9-Air duct; 10-Air duct outlet; 11-Press chamber; 12-Press chamber air inlet; 13-Bird net; 14-Water curtain; 15-Three-proof net; 16-Manure discharge pipe. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1 to 2 , Figure 3 as well as Figure 5 As shown, a convection-diffusion ventilation system for nursery and fattening sheds is used within these sheds. Specifically, it includes a suspended ceiling 2 horizontally installed on the top of the shed 1, dividing the interior space of the shed 1 vertically into an air supply area and a breeding area. The air supply area is connected to an air intake channel 3 located in the middle of the shed 1, with the entire shed symmetrically distributed about the air intake channel 3. The breeding area is connected to negative pressure fans 4 located at the front and rear ends of the shed 1. Its core design features several vertical air ducts 5 below the suspended ceiling 2, connecting the air supply area and the breeding area. All vertical air ducts 5 are located above the pens 6 within the breeding area, and the outlets of all vertical air ducts 5 face the solid floor 8 inside the pens 6, which serves as a partition between adjacent manure ditches 7. The solid floor 8 is equipped with underfloor heating. The ventilation system divides the air supply area and the breeding area through the ceiling 2. Fresh air first enters the air supply area for pre-cooling or pre-heating to avoid direct impact of external fresh air on the pigs. In winter, the vertical air duct 5 blows air directly to the solid ground 8, which, combined with the rising airflow generated by the underfloor heating (the pigs themselves are also a heat source), forms a natural convection path of "ground air supply - heat source lifting - top exhaust", significantly improving airflow efficiency. In summer, the vertical air duct 5 delivers low-temperature fresh air to the ground, which combines with the rising airflow from the pigs' heat source to enhance convection cooling. Secondly, the direct airflow from the ground accelerates the evaporation of moisture near the manure ditch 7, carrying moisture and harmful gases (such as ammonia) to the roof area with the rising airflow, and finally exhausting them by the negative pressure fan 4, reducing the concentration of pollutants in the breeding area.

[0023] like Figure 3As shown, an air duct 9 extending along the length of the building 1 is provided in the air supply area. An air duct outlet 10 is provided at the bottom of the air duct 9. Fresh air from outside can be evenly delivered to every place in the air supply area through the air duct 9.

[0024] like Figure 1 , Figure 3 As shown, a static pressure box 11 is provided in the air supply area and is connected to the top of the vertical air duct 5. The top of the static pressure box 11 is provided with a static pressure box air inlet 12. The static pressure box 11 stabilizes the airflow pressure and ensures that the air outlet of the vertical air duct 5 is uniform.

[0025] like Figure 4 As shown, the entrance to the air intake channel 3 is located at its top, and a horizontally installed bird net 13 is installed at the top entrance to prevent birds from entering the air intake channel 3.

[0026] Continue as Figure 4 As shown, a vertically installed water curtain 14 is also installed on the outside of the bird net 13. In summer, the water curtain 14 can evaporate and cool down, reducing the temperature of the air entering the enclosure.

[0027] Continue as Figure 4 As shown, a vertically installed three-proof net 15 (dustproof, insectproof, and rainproof) is also installed on the outside of the water curtain 14 to protect the water curtain 14 and the air inlet channel 3 from the intrusion of external pollutants.

[0028] like Figure 1 , Figure 6 As shown, the breeding area is equipped with a manure discharge pipe 16 that extends along the width of the shed 1 underground. The manure discharge pipe 16 is connected to the bottom of all the manure ditches 7, and the manure is collected and discharged efficiently through the manure discharge pipe 16.

[0029] The working principle of this utility model: During winter operation: Water curtain 14 is closed. External fresh air enters the air intake duct 3 after being filtered by bird netting 13 and three-proof netting 15, and then enters the air supply area. After being stabilized by air duct 9 and static pressure box 11, it is delivered to the solid ground 8 through vertical air duct 5. Underfloor heating heats the ground, and the fresh air mixes with the rising airflow from the pig's body heat source, forming a natural convection path of "ground air supply - heat source lifting - top exhaust", which carries away moisture and a small amount of harmful gases. Front and rear negative pressure fans 4 are started to maintain a slight negative pressure in the breeding area to ensure orderly airflow.

[0030] During summer operation: Water curtain 14 is turned on, and the outside air is cooled by water curtain 14 before entering the air supply area. The vertical air duct 5 sends out low-temperature fresh air to the ground, which combines with the rising airflow from the pig's heat source to enhance convective cooling. At the same time, the power of the negative pressure fan 4 is increased to accelerate the discharge of polluted air and reduce the temperature and humidity of the breeding area.

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A convection-diffusion ventilation system for nursery and fattening sheds, comprising a suspended ceiling horizontally installed on the top of the shed, the suspended ceiling dividing the interior space of the shed vertically into an air supply area and a breeding area; the air supply area is connected to an air intake channel located in the middle of the shed, and the breeding area is connected to fans located at the front and rear ends of the shed. Its features are: Below the ceiling, there are several vertical air ducts that connect the air supply area and the breeding area. All vertical air ducts are located above the pens in the breeding area, and the air outlets of all vertical air ducts face the solid floor inside the pens used to separate adjacent manure ditches. The solid floor is covered with underfloor heating.

2. The convection-diffusion type ventilation system for nursery and fattening sheds according to claim 1, characterized in that: The air supply area is provided with an air duct extending along the length of the building, and an air supply outlet is provided at the bottom of the air duct.

3. The convection-diffusion type ventilation system for nursery and fattening sheds according to claim 1, characterized in that: The air supply area is equipped with a static pressure box that is connected to the top of the vertical air duct, and the top of the static pressure box has a static pressure box air inlet.

4. The convection-diffusion type ventilation system for nursery and fattening sheds according to claim 1, characterized in that: The air intake duct has its inlet located at its top, where a horizontally installed bird net is provided.

5. The convection-diffusion type ventilation system for nursery and fattening sheds according to claim 4, characterized in that: The bird-proof net is also equipped with a vertically installed water curtain.

6. The convection-diffusion type ventilation system for nursery and fattening sheds according to claim 5, characterized in that: The water curtain is also equipped with a vertically installed three-proof net.

7. The convection-diffusion type ventilation system for nursery and fattening sheds according to claim 1, characterized in that: The fan is a negative pressure fan.

8. The convection-diffusion type ventilation system for nursery and fattening sheds according to claim 1, characterized in that: The breeding area is equipped with underground manure discharge pipes that extend along the width of the sheds and are connected to the bottom of all manure ditches.

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