A dual-row extended ground ventilation system

Abstract

This utility model discloses a dual-exhaust extended ground-level ventilation system, belonging to the field of ground-level ventilation technology. It includes a building and a ditch located beneath the building. The front wall of the building is equipped with a wet curtain for air intake, and the rear wall is equipped with an exhaust fan for exhausting air outwards. The floor of the building is fitted with a perforated plate connected to the ditch. Exhaust fans for exhausting air outwards are installed at both ends of the ditch. This dual-exhaust extended ground-level ventilation system has the following advantages: dual-end exhaust, suitable for long-distance ditches: avoids the wind speed attenuation of single-end exhaust, making the airflow within the ditch more uniform; complementary double-layer airflow, eliminating ventilation dead zones: the main ventilation of the building covers the upper and middle activity areas, while the auxiliary ventilation of the ditch specifically removes accumulated waste gas from the ground, with superimposed double-pathways eliminating ventilation blind spots.

Description

Technical Field

[0001] This utility model relates to the field of ground ventilation technology, specifically a double-exhaust extended ground ventilation system. Background Technology

[0002] With the development of large-scale farming and other fields, the demand for coordinated ventilation between pigsty buildings and the drainage ditches below is increasing. Traditional pigsty ventilation systems only install exhaust fans at one end of the drainage ditch, which has the following significant drawbacks:

[0003] Long-distance trenches have low ventilation efficiency: When the trench length exceeds 50m, the wind speed at the end is severely reduced (<0.1m / s), and the retention of exhaust gas leads to the diffusion of odors;

[0004] Many ventilation dead spots: Relying on ventilation from only one end will cause exhaust gas (such as CO and ammonia from pigsty) at the bottom of the ditch to be unable to be discharged in time, which will easily accumulate and form a "humid area";

[0005] Weak resistance to backflow: The exhaust fans in the trenches have no backflow prevention design, and external wind pressure (such as rainstorms and monsoons) can easily cause exhaust gas to backflow and pollute the buildings. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a dual-exhaust extended ground ventilation system. Through a double-layer structure of "main ventilation of the building + auxiliary ventilation of the ground ditch", combined with wet curtain air intake, double-end exhaust and structural optimization design, it can achieve ventilation without dead corners in the building and uniform exhaust of the ground ditch over a long distance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A double-exhaust extended ground ventilation system includes a building and a ditch located below the building; a wet curtain for air intake into the building is installed on the front wall of the building, and a building exhaust fan for exhausting air out of the building is installed on the rear wall of the building; a perforated plate connected to the ditch is installed on the floor of the building; and ditch exhaust fans for exhausting air out of the ditch are installed at both ends of the ditch.

[0009] By adopting the above scheme, the dual-exhaust extended ground ventilation system uses dual-end exhaust, which is suitable for long-distance trenches and avoids the wind speed attenuation of single-end exhaust, making the airflow in the trench more uniform. Secondly, the main ventilation of the building (wet curtain air intake + rear wall exhaust) covers the middle and upper activity areas, and the trench auxiliary ventilation (slatted board air intake + two-end exhaust) is used to specifically remove the waste gas accumulated on the ground. The two-layer airflow complements each other and eliminates ventilation dead corners.

[0010] In a preferred embodiment of a dual-exhaust extended ground ventilation system, both the building exhaust fan and the ground exhaust fan are equipped with air collection ducts on their outer sides to gather airflow and reduce exhaust resistance.

[0011] In a preferred embodiment of a dual-exhaust extended ground ventilation system, the exhaust fan at the front end of the trench is trench exhaust fan one, and the minimum height of trench exhaust fan one is higher than the maximum height of the wet curtain to avoid mutual interference between the exhaust of trench exhaust fan one and the intake of wet curtain; the exhaust fan at the rear end of the trench is trench exhaust fan two, and the height of trench exhaust fan two is the same as the height of the trench.

[0012] In a preferred embodiment of a dual-exhaust extended ground ventilation system, the second ground exhaust fan is connected to the ground trench via a vertically installed exhaust pipe to prevent exhaust gas from directly overflowing from the trench.

[0013] In a preferred embodiment of a dual-exhaust extended ground ventilation system, an extension trench is provided at the front end of the trench, wherein the extension trench is connected to the exhaust duct, so as to avoid the exhaust duct being close to the air intake wet curtain and affecting the air intake effect of the wet curtain.

[0014] In a preferred embodiment of a double-row extended ground ventilation system, the wet curtain is a honeycomb paper wet curtain or a porous metal wet curtain, which is fixed to the front wall of the building by a waterproof frame. A sealing strip is provided between the frame and the wall to ensure airtightness.

[0015] In a preferred embodiment of a double-exhaust extended ground ventilation system, the building exhaust fan is an axial flow fan or a centrifugal fan, and the ground exhaust fan is an explosion-proof centrifugal fan equipped with a check valve. The outlet of all fans is inclined downward at 15-30° to the horizontal plane to prevent exhaust gas from flowing back upward.

[0016] In a preferred embodiment of a double-row extended ground ditch ventilation system, the perforated plate is a precast reinforced concrete slab or a perforated metal plate, which is fixed to the floor of the building by expansion bolts, and a protective net is provided at the connection point with the ground ditch to prevent debris from entering the ground ditch.

[0017] The beneficial effects of this utility model are:

[0018] 1. Uniform ventilation in long trenches: Exhaust fans are installed at both ends of the trench, and the design of the extended trench and exhaust duct ensures that the wind speed at any cross section within the long trench (≥80m) is ≥0.2m / s, thus avoiding the retention of exhaust gas;

[0019] 2. Double-layer ventilation with no dead corners: The main ventilation of the building (air intake through wet curtain + exhaust through the rear wall) covers the middle and upper activity areas, while the auxiliary ventilation through the trench (air intake through perforated plate + exhaust through both ends) specifically removes the waste gas accumulated on the ground, achieving ventilation without dead corners throughout the entire space;

[0020] 3. High resistance to backflow and safety: The air collection duct on the outside of the trench exhaust fan guides the airflow to discharge in one direction. The fan itself has an explosion-proof design (protection level IP55) and a backflow prevention function (blade angle 90° fully open) to prevent external wind pressure from flowing back. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a top-view structural diagram of the trench;

[0023] Figure 2 A schematic diagram of the cross-sectional structure of the wet curtain on the front wall of the building;

[0024] Figure 3 A schematic diagram of the cross-sectional structure of the fan on the rear wall of the building;

[0025] Markings in the diagram: 1-Building; 2-Ditch; 3-Wet curtain; 4-Building exhaust fan; 5-Slatted board; 6-Ditch exhaust fan one; 7-Ditch exhaust fan two; 8-Exhaust duct; 9-Extended ditch. Detailed Implementation

[0026] 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.

[0027] like Figures 1 to 3As shown, a double-exhaust extended ground duct ventilation system is provided for ventilation of the pigsty ditch. Specifically, it includes a pigsty 1 (50m long, 15m wide, and 3m high) and a ditch 2 (extended manure ditch, 50m long, 2m wide, and 1.2m high) located below the pigsty 1. The front wall of the pigsty 1 is equipped with a wet curtain 3 for air intake into the pigsty 1, and the rear wall of the pigsty 1 is equipped with a house exhaust fan 4 for exhausting air out of the pigsty 1. The floor of the pigsty 1 is equipped with a perforated plate 5 (for draining pig manure) that is connected to the ditch 2. Both the front and rear ends of the ditch 2 are equipped with ditch exhaust fans for exhausting air out of the ditch. The ventilation system adopts dual-end exhaust, which is suitable for long-distance trench 2 and avoids the wind speed attenuation of single-end exhaust. According to actual measurement, the wind speed at any cross section in trench 2 is ≥0.2m / s, making the airflow in trench 2 more uniform. Secondly, the main ventilation of building 1 (air intake of wet curtain 3 + exhaust of rear wall) covers the middle and upper activity area, and the auxiliary ventilation of trench 2 (air intake of perforated plate 5 + exhaust at both ends) is used to specifically remove the waste gas accumulated on the ground. The two-layer airflow complements each other. According to actual measurement, the average wind speed in the middle and upper part of building 1 (1.5-2.5m height) is 0.45m / s, and the average wind speed on the ground (0-0.5m height) is 0.3m / s, with no ventilation dead corners.

[0028] like Figure 2 As shown, both the building exhaust fan 4 and the trench exhaust fan are equipped with air collection tubes (1.2m×1.0m in size, 20° inclination angle) on the outside, which are used to gather airflow and reduce exhaust resistance.

[0029] like Figures 2 to 3 As shown, the exhaust fan at the front end of trench 2 is trench exhaust fan 6. The minimum height of trench exhaust fan 6 is higher than the maximum height of wet curtain 3 (the height of trench exhaust fan 6 is 1.5 times the height of wet curtain 3) to avoid the exhaust of trench exhaust fan 6 and the intake of wet curtain 3 affecting each other; the exhaust fan at the rear end of trench 2 is trench exhaust fan 7. The height of trench exhaust fan 7 is the same as the height of trench 2.

[0030] like Figure 3 As shown, the second exhaust fan 7 in the trench is connected to the trench 2 through a vertically installed exhaust pipe 8 (500mm in diameter, made of galvanized steel plate) (the pipe inlet is 0.5m from the bottom of the trench 2), which prevents the exhaust gas in the trench 2 from overflowing directly.

[0031] Continue as Figure 3 As shown, an extension trench 9 (with the same width as the main trench 2) is provided 6m forward from the front end of the trench 2. The extension trench 9 is connected to the exhaust duct 8 to prevent the exhaust duct 8 from being close to the air intake wet curtain 3 and affecting the air intake effect of the wet curtain 3.

[0032] The above describes the wet curtain 3 as a honeycomb paper wet curtain (10m×3m). Alternatively, a porous metal wet curtain 3 can be used. It is fixed to the front wall of the building 1 by a waterproof frame, and the gap between the frame and the wall is sealed with weather-resistant adhesive. The top of the wet curtain 3 is flush with the top of the building 1, and the bottom is 0.5m from the ground (to avoid blocking the leak-proof board 5).

[0033] The above-mentioned building exhaust fan 4 is an axial flow fan (model T35-11-4, rated power 3kW, air volume 8000m³ / h). 3 / h), or a centrifugal fan can also be used, installed at a height of 2.8m above the ground (3m clear height for building 1), with the outlet tilted downwards at 15° (to prevent exhaust gas from flowing back up). The downward tilt angle can be between 15-30°. The trench exhaust fan is an explosion-proof centrifugal fan with a check valve (model 4-72-11-6C, rated air volume 10000m³ / h). 3 / h, protection level IP55), its bottom is 0.3m from the bottom of the trench 2.

[0034] The above-mentioned trench 2 is made of reinforced concrete (wall thickness 200mm), and the bottom of the trench is set with a longitudinal slope of 0.8% (slope towards the water collection wells at both ends, spaced 40m apart, with dimensions of 1.5m×1.0m×1.2m);

[0035] The above describes the sprue 5 as a reinforced concrete sprue (20m x 20m, 20% opening rate, 3mm hole diameter), with the top surface of the sprue 5 flush with the ground (error ≤ 3mm).

[0036] 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 double-row extended ground ventilation system, comprising a building and a ground ditch located beneath the building; characterized in that The front wall of the building is equipped with a wet curtain to allow air to enter the building, and the rear wall of the building is equipped with an exhaust fan to exhaust air to the outside of the building. The floor of the building is equipped with a perforated board that connects to the drainage ditch; Both ends of the trench are equipped with trench exhaust fans that vent air out of the trench.

2. The dual exhaust plenum elongated slot ventilation system of claim 1, wherein: Both the building exhaust fan and the trench exhaust fan are equipped with air collection ducts on their outer sides.

3. The dual exhaust plenum elongated slot ventilation system of claim 1, wherein: The trench exhaust fan at the front end of the trench is trench exhaust fan one, and the minimum height of trench exhaust fan one is higher than the maximum height of the wet curtain. The exhaust fan at the rear end of the trench is called the second trench exhaust fan, and the height of the second trench exhaust fan is the same as the height of the trench.

4. The dual exhaust plenum elongated slot ventilation system of claim 3, wherein: The second trench exhaust fan is connected to the trench via a vertically installed exhaust pipe.

5. The dual exhaust plenum elongated slot ventilation system of claim 4, wherein, The front end of the trench extends forward to form an extension trench, which is connected to the exhaust duct.

6. The dual exhaust plenum elongated slot ventilation system of claim 1, wherein, The wet curtain is a honeycomb paper wet curtain or a porous metal wet curtain, which is fixed to the front wall of the building by a waterproof frame.

7. The dual exhaust plenum elongated slot ventilation system of claim 1, wherein: The building exhaust fans are axial flow fans or centrifugal fans, and the trench exhaust fans are explosion-proof centrifugal fans equipped with check valves. The outlet direction of all fans is inclined downward at 15-30° to the horizontal plane.

8. The dual exhaust plenum elongated slot ventilation system of claim 1, wherein: The perforated plate is a precast reinforced concrete slab or a porous metal plate.

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