A pig house spray cooling system

Abstract

The present invention discloses a pig house spray cooling system, which belongs to the technical field of livestock and poultry breeding environment optimization and air conditioning and intelligent breeding equipment. It includes a main pipeline, a connecting pipeline, a negative pressure device, a dehumidifying device and an atomizing nozzle; the water inlet of the connecting pipeline is connected to the main pipeline, and the water outlet of the connecting pipeline is connected to the top water inlet of the negative pressure device; the bottom water outlet of the negative pressure device is connected to the atomizing nozzle through a pressure-relief pipeline; a pressure difference is formed between the inside of the negative pressure device and the external environment; the gas inlet of the dehumidifying device is connected to the external environment, the gas outlet of the dehumidifying device is connected to the side wall air inlet pipeline of the negative pressure device, and the liquid outlet of the dehumidifying device is connected to the pressure-relief pipeline through an infusion pipeline. The present invention has a good atomization effect, and dehumidifies the gas in the pig house while realizing spraying through the Venturi effect, ensuring the continuous evaporation and cooling process, and improving the problem of excessive humidity in the house caused by spraying during the operation of the traditional spray cooling system.

Description

Technical Field

[0001] The present invention belongs to the technical field of livestock and poultry breeding environment optimization and control and intelligent breeding equipment, and specifically relates to a pig house spray cooling system. Background Art

[0002] Pigs have thick subcutaneous fat and underdeveloped sweat glands, making them less able to regulate their body temperature through perspiration. Research shows that pigs thrive in temperatures between 20-23°C, with the most suitable temperature in pig houses being 15-18°C and a relative humidity of 60%-80%. High summer temperatures can severely impact pigs' physiological functions. For example, when the ambient temperature exceeds the optimal range for pigs, it can severely impact their production performance, leading to irregular or delayed estrus in sows, decreased breeding rates, and reproductive failure. Males experience decreased libido and poor semen quality, severely impacting fertilization rates. Thermal homeostasis can be disrupted, causing heat stress and weakening immunity, leading to a variety of diseases. Poor or sub-healthy pigs are particularly susceptible to outbreaks of various bacterial and viral diseases. Therefore, to ensure normal summer production on pig farms, temperature management must be implemented according to the temperature requirements of each pig group, and effective cooling measures must be implemented. Effective summer cooling measures are crucial for ensuring the production performance of pig farms, especially sow farms.

[0003] Currently, common cooling methods used in piggeries during the summer include: wet curtain cooling systems, air coolers, drip cooling systems, and spray cooling systems. While wet curtain cooling systems and air coolers effectively reduce indoor temperatures and provide a relatively dry environment compared to spray and drip cooling systems, they can easily lead to uneven temperatures within the barn, with temperatures being lower near the wet curtains and higher away from them. These systems also require high investment and limited controllability, making it difficult to adjust the cooling system to the level of heat stress experienced by the pigs within. Furthermore, wet curtains have a short lifespan, particularly in piggeries with highly alkaline circulating water. They can easily become alkaline and clogged. During the autumn, winter, and spring off-season, they can become a hiding place for rats and can be damaged. Drip cooling systems are more commonly used in confined pig pens. While they offer better cooling effects, they also temporarily increase local humidity, water consumption, and wastewater discharge. In a spray cooling system, water is atomized through a spray device. Some of the water floats within the pig house, evaporating and removing heat. The airflow generated by the negative pressure fan removes this water. The remaining atomized water falls on the pig's skin, where it also quickly evaporates, removing heat from the pig's body. This water, which settles on the ground, lowers the ground temperature, achieving effective cooling with minimal investment. Using evaporation to cool the environment is a common method for cooling pig houses in summer. Evaporative cooling utilizes the principle of heat absorption through evaporation, using sprays, mists, or other water spray systems to cool pig houses. Small droplets or mist sprayed into the pig house absorb heat from the air and evaporate, removing heat from the air and lowering the ambient temperature. Simultaneously, some of the droplets or mist settle on the pig's skin, where they also exchange heat and absorb heat from the pig's body. This method is applicable to most pig farming regions in my country, offering significant cooling effects and economic benefits, and can effectively cool pig houses in a short period of time.

[0004] However, the current spray cooling system has the following problems:

[0005] (1) The commonly used sprinkler systems in pig houses consume a lot of water, and the droplets are unevenly distributed in the house. Some spaces are not fully cooled due to the small number of droplets distributed, resulting in uneven temperature and humidity distribution in the pig house, high humidity in some areas, and potential cooling risks. The average cooling efficiency in the house is very low.

[0006] (2) Long-term operation leads to excessive humidity in the pig house environment, and evaporative cooling cannot be sustained. The existing pig house spray system sprays large droplet size and poor atomization effect. Often due to excessive coarse droplets sprayed in or the indoor air humidity reaching saturation, the droplets cannot be completely evaporated, and then wet the ground and the livestock, making it impossible to continue cooling, and causing the indoor environment humidity to be too high, forming a high temperature and high humidity situation. Summary of the Invention

[0007] In order to solve the above technical problems, the present invention proposes a pig house spray cooling system, which makes the sprayed droplets evenly distributed in the pig house, improves the atomization effect, and realizes dehumidification of the gas in the pig house while spraying through the Venturi effect, ensuring the continuous evaporation cooling process, and improving the problem of excessive humidity in the pig house caused by spraying during the operation of traditional spray cooling systems.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] A pig house spray cooling system includes a main pipe, connecting pipes, a negative pressure device, a dehumidification device and an atomizing nozzle;

[0010] The water inlet of the connecting pipe is connected to the main pipe, and the water outlet of the connecting pipe is connected to the top water inlet of the negative pressure device; the bottom water outlet of the negative pressure device is connected to the atomizing nozzle through a pressure-relief pipe; a pressure difference is formed between the inside of the negative pressure device and the external environment;

[0011] The gas inlet of the dehumidification device is connected to the external environment, the gas outlet of the dehumidification device is connected to the side wall air inlet pipe of the negative pressure device, and the liquid outlet of the dehumidification device is connected to the pressure relief pipe through the infusion pipe.

[0012] Furthermore, a pressure boosting device is provided between the water outlet of the connecting pipe and the top water inlet of the negative pressure device.

[0013] Furthermore, the atomizing nozzle contains a plurality of high-frequency atomizing sheets.

[0014] Furthermore, the main pipeline is horizontally installed on the top of the pig house, and a plurality of water outlets for connecting the connecting pipelines are opened on the main pipeline.

[0015] Furthermore, the connecting pipe includes a three-way pipe and several detachable extension pipes. The water inlet of the three-way pipe is connected to the main pipe. The extension pipe is used to extend the water outlet height of the three-way pipe to adjust the height of the atomizing nozzle from the pig's back.

[0016] Furthermore, the inner wall surface of the pressure-relief pipe is a curved surface.

[0017] Furthermore, the negative pressure device includes a negative pressure chamber, an upper contraction pipe connected to the water inlet at the top of the negative pressure chamber, and a lower diffusion pipe connected to the water outlet at the bottom of the negative pressure chamber; the inner side surface of the negative pressure chamber is a conical inclined surface.

[0018] Furthermore, the dehumidification device includes a dehumidification chamber connected to the negative pressure chamber, and an evaporator, a condenser, an air compressor and a water collection tank installed in the dehumidification chamber; the evaporator and the condenser are connected by a capillary tube, and both are powered by the air compressor;

[0019] The water collecting tank is installed below the evaporator, and the bottom of the water collecting tank is connected with the pressure relief pipe through the liquid infusion pipe.

[0020] Furthermore, an air filter is installed at the gas inlet of the dehumidification chamber that is connected to the external environment. A HEPA filter layer is placed in the air filter to prevent large particles from entering the subsequent pipelines of the device and causing blockage.

[0021] The present invention has the following beneficial effects:

[0022] (1) The present invention is an integrated spray-dehumidification system designed using the Venturi effect. While spraying and cooling the pig house, it reduces the impact of the traditional spray system on the humidity of the pig house during operation, thereby solving the pain point problem in the prior art that the humidity in the pig house environment is too high and evaporative cooling cannot be carried out continuously; at the same time, it increases the utilization efficiency of the water in the pig house environment and reduces the water consumption of the spray system.

[0023] (2) The present invention utilizes the negative pressure generated by the Venturi effect to enable the air flow in the environment to enter the dehumidification chamber without the need for a negative pressure fan, thereby reducing the noise generated during the operation of the entire system and saving energy consumption for system operation; moreover, the negative pressure generated in the negative pressure chamber creates a pressure difference between the interior of the equipment and the surrounding environment, driving the flow of gas in the environment, promoting evaporative heat dissipation of the pig body, and improving the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of a pig house spray cooling system provided by an embodiment of the present invention;

[0025] Figure 2 A structural stereogram of a pig house spray cooling system provided by an embodiment of the present invention;

[0026] Figure 3 is a cross-sectional view of the negative pressure device;

[0027] In the figure: 1-main pipeline; 2-tee pipeline; 3-extension pipeline; 4-pipe joint; 5-boosting device; 6-negative pressure device; 7-dehumidification chamber; 8-air filter device; 9-water supply pipeline; 10-pressure relief pipeline; 11-atomizing nozzle; 12-capillary tube; 13-water collection device; 14-condenser; 15-evaporator; 16-air compressor; 17-HEPA filter layer. DETAILED DESCRIPTION

[0028] The objects, solutions and advantages of the present invention are described in detail below with reference to the accompanying drawings.

[0029] like Figure 2As shown, the present invention proposes a pig house spray cooling system, which primarily comprises a main pipe 1, connecting pipes, a negative pressure device, a dehumidifier, and an atomizing nozzle with atomizing blades. The central axis of the vertical pipe device is perpendicular to the installation ground. The number of vertical pipe devices installed depends on the size of the pig house. The installation height is preferably about 1.2 meters from the top of the pig, and the installation angle is 90 degrees to the ground. Typically, a single vertical pipe device can cover an area of ​​12 square meters.

[0030] In one embodiment of the present invention, the connecting pipe comprises a tee pipe 2, an extension pipe 3, and a pipe joint 4. The extension pipe is used to extend the height of the water outlet of the tee pipe, thereby adjusting the height of the atomizing nozzle from the pig's back. The water inlet of the tee pipe 2 is connected to the main pipe 1, and the water outlet of the tee pipe 2 is connected to the extension pipe 3. The water outlet of the extension pipe is connected to the water inlet of the booster device 5 via the pipe joint 4, and the water outlet of the booster device is connected to the negative pressure device via the pipe joint 4.

[0031] In this embodiment, the main pipe 1 is horizontally installed on the top of the pig house. Several water outlets can be opened on the main pipe for installing several three-way pipes 2. The three-way pipes 2, extension pipes 3, etc. are perpendicular to the installation ground.

[0032] like Figure 3 As shown, the negative pressure device includes a negative pressure chamber, an upper contraction pipe connected to the water inlet at the top of the negative pressure chamber, and a lower diffusion pipe connected to the water outlet at the bottom of the negative pressure chamber; the inner side surface of the negative pressure chamber is a conical slope. The top of the negative pressure chamber is connected to the water outlet of the boosting device through the upper contraction pipe, and the bottom of the negative pressure chamber is connected to the pressure relief pipe through the lower diffusion pipe. The present invention utilizes the Venturi effect to generate a negative pressure area in the negative pressure chamber, thereby achieving dehumidification of the gas in the surrounding environment while spraying. In this embodiment, the negative pressure chamber is formed by splicing a hollow inverted cone and a hollow cylinder, and a truncated cone-shaped slot is provided in the hollow cylinder. The hollow inverted cone and the hollow cylinder with the truncated cone-shaped slot are completely connected inside. The height of the middle of the negative pressure chamber 6 is lower than the height of the edge. A conical slope is formed at the bottom and inner side of the negative pressure chamber. The side wall of the negative pressure chamber is provided with an air inlet channel for connecting to the dehumidification device.

[0033] Water flowing in from the horizontal main pipe 1 passes through the vertical three-way pipe 2 and then flows into the extension pipe 3. Due to the different heights of the pig house and the installation height of the main pipe, the height of the nozzle 11 from the pig's back can be adjusted by adjusting the number of extension pipes 3 installed. When the cross-sectional area through which the liquid flows becomes smaller, the flow rate of the water in the pipe increases. Therefore, when the water in the extension pipe 3 flows through the booster device 5 and then flows through the upper compression pipe above the negative pressure chamber 6, the dynamic pressure reaches a maximum value and the static pressure reaches a minimum value, forming a negative pressure area at the outlet of the upper contraction pipe. Under the action of the pressure difference, the gas in the pig house environment is sucked into the dehumidification device. The dehumidified water droplets enter the nozzle. After the dehumidification treatment, the dry and warm gas reaches the negative pressure chamber and flows into the lower diffusion pipe together with the water flow, thereby achieving the purpose of adjusting the humidity of the pig house environment during spraying, ensuring continuous evaporative cooling. In addition, the negative pressure not only completes the dehumidification process, but also drives the flow of gas in the environment, better promoting evaporative heat dissipation from the pigs.

[0034] The dehumidification device mainly uses the negative pressure formed by the Venturi effect during spraying. The high-humidity gas in the surrounding environment is sucked into the dehumidification device under the action of the pressure difference to achieve dehumidification. At the same time, it drives the flow of gas in the upper and lower layers of the space, promoting evaporation and heat dissipation of the pig body. Figure 1 As shown, the dehumidification device includes a dehumidification chamber 7 connected to the negative pressure chamber, and an evaporator 15, a condenser 14, a micro air compressor 16 and a water collecting tank 13 installed in the dehumidification chamber. The evaporator 15 and the condenser 14 are connected by a capillary tube 12, and both are powered by the micro air compressor 16; the water collecting tank 13 is a funnel structure, installed below the evaporator 15, and the bottom of the water collecting tank 13 is connected to the pressure relief pipe 10 through an infusion pipe 9. In this embodiment, the infusion pipe 9 is connected to the pressure relief pipe 10, slightly higher than the nozzle position. The infusion pipe 9 can support the entire dehumidification device while transporting condensed water, so that the overall structure of the device is stable. The present invention connects the negative pressure chamber with the dehumidification chamber, and uses the negative pressure generated by the Venturi effect to achieve the purpose of dehumidifying the gas in the surrounding environment without the need for a negative pressure fan.

[0035] An air filter layer 17, such as a HEPA filter, is installed on one side of the dehumidification chamber, which is preferably installed on the side away from the negative pressure chamber to ensure that the gas entering the dehumidification chamber is fully processed in the dehumidification chamber; high-humidity gas enters the dehumidification chamber through the air filter device 8. The air filter device has micropores on the outside, which can prevent larger particles in the environment from entering the device. The HEPA filter can adsorb pollutants such as suspended particles and bacteria in the gas, while reducing the concentration of suspended particles in the environment and effectively reducing the damage caused by particles to other components of the equipment. As high-humidity air passes through air compressor 16, driving evaporator 15 and condenser 14, moisture in the air condenses into small water droplets, which fall to water collection tank 13 under the action of gravity. The high-humidity air in the environment exchanges heat as it passes through evaporator 15, causing its temperature to drop. When the humid air reaches its dew point, moisture condenses and forms small water droplets, which fall to water collection tank 13 below the evaporator under the action of gravity. The absolute moisture content of the humid air decreases. When the dried air passes through condenser 14 (with a high surface temperature), heat exchange occurs again, raising its temperature. Evaporator 15, condenser 14, and air compressor 16 are connected by capillary tube 12. A pipe runs from the exhaust port of compressor 16 to one end of condenser 14, and from the other end of condenser 14 to one end of evaporator 15. Finally, a pipe runs from the other end of evaporator 15 to the intake port of compressor 16. The function of the compressor 16 in the system is to convert the low-temperature, low-pressure refrigerant gas that has undergone heat exchange in the evaporator 15 into a high-temperature, high-pressure gas that is sucked in by the compressor 16 (compressed) and transported through a pipeline to the condenser 14 (cooled and releases heat) to become a medium-temperature, high-pressure liquid that then flows back into the air compressor through a pipeline. Although the capillary tube 12 is called a capillary tube, it does not actually have a capillary effect. One end of it is connected to the outlet of the condenser 14 and the other end is connected to the inlet of the evaporator 15. In this structure, no heat exchange occurs. The capillary tube 12 can maintain a certain pressure difference between the condenser 14 and the evaporator 15, so that the refrigerant vapor in the condenser 14 has a higher pressure, thereby allowing the refrigerant vapor in the condenser 14 to dissipate heat and condense into liquid; and ensure that the refrigerant liquid in the evaporator 15 has a lower pressure, so that the refrigerant liquid absorbs heat and evaporates into gas. The air passes through the evaporator 15 (low surface temperature) to condense water, which is then transported from the condenser b (high surface temperature) through the infusion pipe 9 and finally into the atomizing nozzle 11, increasing the efficiency of water utilization in the environment. The dry, warm air after dehumidification reaches the negative pressure chamber and flows into the pressure relief pipe 10 along with the water flow, completing the gas dehumidification process. The speed at which the gas in the surrounding environment enters the dehumidification device is positively linearly correlated with the water flow rate in the three-way pipe 2. Therefore, the speed at which high-humidity gas in the environment enters the dehumidification device can be changed by controlling the water flow rate in the connecting pipe.

[0036] The atomizing nozzle 11 adopts an ultrasonic atomizing nozzle, which contains multiple high-frequency atomizing sheets inside. The high-frequency atomizing sheets can break up the liquid water molecular structure and produce particles with smaller particle size. The sprayed droplets are finer and the atomization is denser, which can achieve a better atomization effect. The water sprayed into the environment is quickly vaporized and absorbs the sensible heat in the pig house, thereby achieving a better cooling effect, solving the problem of coarse spray droplets, slow evaporation and fast sedimentation in traditional spray cooling systems. In addition, the ultrasonic atomizing nozzle can release a large amount of negative ions during the atomization process to produce electrostatic reactions with dust in the air. While accelerating dust precipitation, it can remove harmful substances in the pig house environment, purify the air in the house, and reduce the occurrence of diseases.

[0037] The working process of the above-mentioned spray cooling system is as follows:

[0038] (1) When the ambient temperature in the pig house is high, turn on the spray cooling system;

[0039] (2) The water flow in the main pipe 1 passes through the three-way pipe 2 and the extension pipe 3 and enters the booster device 5, thereby accelerating the water flow and forming a negative pressure area in the negative pressure device 6. At this time, a pressure difference is formed between the inside of the device and the external environment.

[0040] (3) Under the action of the pressure difference, the high-humidity gas in the pig house environment enters the dehumidification device. After the dehumidification treatment, the gas entering the negative pressure device flows rapidly with the water flow in the pipeline, reduces the flow speed after passing through the diffusion pipeline, and then reaches the atomizing nozzle 11 after passing through the pressure-relief pipeline; at the same time, the condensed water after the dehumidification treatment is collected through the infusion pipeline 9 and then enters the extended pipeline to reach the atomizing nozzle 11;

[0041] (4) The water-gas mixture in the atomizing nozzle 11 is vibrated at high frequency by the atomizing plate to form a water mist with smaller particle size, which is sprayed into the environment, where it absorbs heat and is quickly vaporized, thereby achieving the purpose of lowering the ambient temperature in the pig house.

[0042] The above examples are merely specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and many variations are possible. All variations that can be directly derived or imagined by a person skilled in the art from the disclosure of the present invention should be considered to be within the scope of protection of the present invention.

Claims

1. A pig house spray cooling system, characterized in that: It includes a main pipeline (1), a connecting pipeline, a negative pressure device (6), a dehumidification device and an atomizing nozzle (11); The water inlet of the connecting pipe is connected to the main pipe (1), and the water outlet of the connecting pipe is connected to the top water inlet of the negative pressure device; the bottom water outlet of the negative pressure device is connected to the atomizing nozzle through the pressure-relief pipe (10); a pressure difference is formed between the interior of the negative pressure device and the external environment; The gas inlet of the dehumidification device is connected to the external environment, the gas outlet of the dehumidification device is connected to the side wall air inlet pipe of the negative pressure device, and the liquid outlet of the dehumidification device is connected to the pressure relief pipe (10) through the liquid infusion pipe (9); The negative pressure device includes a negative pressure chamber, an upper contraction pipe connected to the water inlet at the top of the negative pressure chamber, and a lower diffusion pipe connected to the water outlet at the bottom of the negative pressure chamber; the inner side surface of the negative pressure chamber is a conical inclined surface; The dehumidification device comprises a dehumidification chamber (7) connected to a negative pressure chamber, and an evaporator (15), a condenser (14), an air compressor (16) and a water collecting tank (13) installed in the dehumidification chamber; the evaporator (15) and the condenser (14) are connected via a capillary tube (12), and both are powered by the air compressor (16); the water collecting tank (13) is installed below the evaporator (15), and the bottom of the water collecting tank (13) is connected to the pressure relief pipe (10) via a liquid infusion pipe (9).

2. A pig house spray cooling system according to claim 1, characterized in that: A pressure boosting device (5) is provided between the water outlet of the connecting pipe and the top water inlet of the negative pressure device.

3. A pig house spray cooling system according to claim 1, characterized in that: The atomizing nozzle (11) contains a plurality of high-frequency atomizing sheets.

4. A pig house spray cooling system according to claim 1, characterized in that: The main pipeline (1) is horizontally installed on the top of the pig house, and a plurality of water outlets for connecting the connecting pipelines are opened on the main pipeline (1).

5. The pig house spray cooling system according to claim 1, characterized in that: The connecting pipe comprises a three-way pipe and a plurality of detachable extension pipes, the water inlet of the three-way pipe is connected to the main pipe (1), and the extension pipe is used to extend the height of the water outlet of the three-way pipe to achieve adjustment of the height of the atomizing nozzle from the pig's back.

6. A pig house spray cooling system according to claim 1, characterized in that: The inner wall surface of the pressure-relief pipe is a curved surface.

7. The pig house spray cooling system according to claim 1, characterized in that: An air filter device (8) is installed at the gas inlet of the dehumidification chamber (7) communicating with the external environment, and a HEPA filter layer (17) is placed in the air filter device (8).

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