Thermal recovery ventilation and air conditioning unit for livestock and poultry breeding

Abstract

The present invention belongs to the field of ventilation technology and relates to a heat recovery ventilation and air conditioning unit for livestock and poultry breeding, which comprises a unit housing. Inside the unit housing, there are a heat exchange core and a partition. The heat exchange core and the partition divide the internal space of the unit housing into a fresh air fan chamber, an indoor exhaust air chamber, an outdoor fresh air chamber and an exhaust air fan chamber. A fresh air fan and an exhaust air fan are respectively installed in the fresh air fan chamber and the exhaust air fan chamber. One pair of opposite sides of the heat exchange core are respectively communicated with the indoor exhaust air chamber and the exhaust air fan chamber, and the other pair of opposite sides are respectively communicated with the fresh air fan chamber and the outdoor fresh air chamber. The unit housing also is provided with a fresh air bypass unit, an exhaust air bypass unit and a return air bypass unit. The present invention can adjust the working conditions of the fresh air fan, the exhaust air fan, the fresh air bypass unit, the exhaust air bypass unit and the return air bypass unit according to the actual conditions in different seasons and different breeding stages, so as to realize the precise adjustment of heat recovery, temperature and humidity, air volume and energy consumption reduction and energy conservation.

Description

Technical Field

[0001] The present invention relates to a heat recovery ventilation and air conditioning unit for livestock and poultry breeding, belonging to the technical field of ventilation. Background Art

[0002] The currently applied ventilation units mainly include two categories. One is a pure fresh air air conditioning unit without heat recovery function, which can only adjust the fresh air such as heating, cooling, and humidifying first and then send it into the housing interior. And all the air in the housing is directly discharged to the outside by the housing exhaust system, resulting in all the heat in the housing being wasted. Therefore, the energy consumption for fresh air treatment is large, not energy-saving, and the breeding cost is high. The other is a pure fresh air ventilation unit with heat recovery function, which can exchange heat between the exhaust air in the housing and the fresh air sent into the housing. However, due to the lack of functions of return air bypass, exhaust air bypass, and fresh air bypass, when in different feeding stages, during seasonal alternation, when the temperature changes frequently or when heat recovery is not required, the internal resistance of the system does not change, so the fan cannot be accurately adjusted, and frequency reduction and energy saving cannot be achieved. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a heat recovery ventilation and air conditioning unit for livestock and poultry breeding, which can adjust the working conditions of the fresh air fan, exhaust fan, fresh air bypass unit, exhaust air bypass unit, and return air bypass unit according to the actual situations in different seasons and different breeding stages, so as to achieve accurate adjustment of heat recovery, temperature and humidity, air volume, and energy consumption reduction and energy saving.

[0004] The heat recovery ventilation and air conditioning unit for livestock and poultry breeding described in the present invention includes a unit housing. Inside the unit housing, there are a heat exchange core and a partition. The heat exchange core and the partition divide the internal space of the unit housing into a fresh air fan chamber, an indoor exhaust air chamber, an outdoor fresh air chamber, and an exhaust fan chamber. The fresh air fan chamber is communicated with a fresh air outlet, and a fresh air inlet valve is arranged at the fresh air inlet. The indoor exhaust air chamber is communicated with an exhaust air inlet. The outdoor fresh air chamber is communicated with the fresh air inlet. The exhaust fan chamber is communicated with an exhaust air outlet. And a fresh air fan and an exhaust fan are respectively installed in the fresh air fan chamber and the exhaust fan chamber. One opposite side of the heat exchange core is respectively communicated with the indoor exhaust air chamber and the exhaust fan chamber, and the other opposite side is respectively communicated with the fresh air fan chamber and the outdoor fresh air chamber. The unit housing also is provided with a fresh air bypass unit, an exhaust air bypass unit, and a return air bypass unit. The fresh air bypass unit is communicated with the outdoor environment and the fresh air fan chamber. The exhaust air bypass unit is communicated with the indoor exhaust air chamber and the exhaust fan chamber. The return air bypass unit is communicated with the indoor exhaust air chamber and the fresh air fan chamber.

[0005] The motors used for the fresh air fan and the exhaust fan can both be selected as variable frequency motors, and the specific working states are as described below.

[0006] During winter operation: The fresh air inlet valve is in the open state. Fresh air path: Fresh air enters the outdoor fresh air chamber from the fresh air inlet, then enters the fresh air fan chamber after passing through the heat exchange core, and then enters the house through the fresh air fan and fresh air outlet; Exhaust path: The exhaust air in the house enters the indoor exhaust air chamber from the exhaust air inlet, then enters the exhaust air fan chamber after passing through the heat exchange core, and finally is discharged to the outside through the exhaust air fan and exhaust air outlet. During this process, fresh air and exhaust air exchange heat when passing through the heat exchange core, heating the fresh air, increasing the temperature of the fresh air sent into the house, reducing the natural gas consumption of the heaters in the house, and at this time, the fresh air bypass unit, exhaust air bypass unit, and return air bypass unit are all in a non-working state;

[0007] During summer operation: The fresh air bypass unit and the exhaust air bypass unit are in the working state, the return air bypass unit is in the non-working state, and the fresh air inlet valve is in the closed state. Fresh air path: Fresh air enters the fresh air fan chamber through the fresh air bypass unit, and then is sent into the house through the fresh air fan and fresh air outlet; Exhaust path: The exhaust air in the house enters the indoor exhaust air chamber through the exhaust air inlet, then enters the exhaust air fan chamber through the exhaust air bypass unit, and finally is discharged to the outside through the exhaust air fan and exhaust air outlet. During this process, fresh air and exhaust air do not need to exchange heat, the system resistance is small, the fresh air fan can be used with a reduced frequency, and energy consumption is reduced;

[0008] During the season transition, when the outside environmental temperature is lower than the temperature in the house and the temperature difference is small, the ventilation volume of each part is adjusted by adjusting the opening degree of the fresh air inlet valve and the working degrees of the fresh air bypass unit, exhaust air bypass unit, and return air bypass unit:

[0009] At this time, for the fresh air intake situation, assuming the fresh air fan air supply volume is 100%, the air intake volume through the fresh air inlet - heat exchange core - fresh air fan chamber is 50%, the air intake volume through the fresh air bypass unit into the fresh air fan chamber is 30%, and the air intake volume through the return air bypass unit into the fresh air fan chamber is 20%. The final air intake volume entering the fresh air fan chamber is sent into the house through the fresh air fan and fresh air outlet. During this process, the fresh air entering the fresh air fan chamber through the fresh air bypass unit and the return air bypass unit does not pass through the heat exchange core, so the system resistance is reduced, the fresh air fan can be used with a reduced frequency, the energy consumption of the fresh air fan is reduced, and the 20% of the fresh air entering the fresh air fan chamber through the return air bypass unit is high-temperature return air, which can increase the fresh air supply temperature and reduce the natural gas consumption in the house;

[0010] At this time, regarding the exhaust situation in the house, it is set that the air volume entering the indoor exhaust chamber from the chicken house is 100% of the rated air volume of the exhaust fan. At this time, the working air flow is also divided into three paths: The first path accounts for 50% of the rated air volume of the exhaust fan and successively passes through the indoor exhaust chamber - heat exchange core - exhaust fan - exhaust outlet and is discharged into the environment; the second path accounts for 30% of the rated air volume of the exhaust fan and successively passes through the indoor exhaust chamber - exhaust bypass unit - exhaust fan - exhaust outlet and is discharged into the environment; the third path accounts for 20% of the rated air volume of the exhaust fan and successively passes through the indoor exhaust chamber - return air bypass unit - fresh air fan - fresh air outlet and re-enters the house. That is, 20% of the above fresh air intake situation is high-temperature return air. According to the above fresh air intake situation, it can be known that the actual fresh air volume sent into the chicken house is 80% of the rated air volume of the fresh air fan. At this time, the load of the exhaust fan is 80% of the rated value, and 30% does not pass through the heat exchange core, so the system resistance will also decrease. Therefore, the exhaust fan can also be used with a reduced frequency, and the energy consumption of the fan is reduced. In this cycle process, the fresh air has two heating processes. The first time is that 50% of the fresh air and 50% of the exhaust air pass through the heat exchange core for energy recovery to increase the temperature of the fresh air at the fresh air inlet; the second time is that 20% of the high-temperature return air is mixed into the fresh air to further increase the supply air temperature at the fresh air outlet, reducing the consumption of natural gas in the house.

[0011] Preferably, the fresh air bypass unit includes a fresh air bypass pipe, on which a fresh air bypass valve is provided. The two ends of the fresh air bypass pipe are respectively connected to the outdoor environment and the fresh air fan chamber; and a non-woven cotton filter cloth is provided between the fresh air fan chamber and the fresh air bypass pipe. The fresh air volume passing through the fresh air bypass unit can be adjusted by controlling the opening degree of the fresh air bypass valve, and the fresh air entering the fresh air fan chamber is filtered by the non-woven cotton filter cloth to ensure that the fresh air is clean.

[0012] Preferably, the exhaust bypass unit includes an exhaust bypass air pipe, the two ends of which are respectively connected to the indoor exhaust chamber and the exhaust fan chamber. An exhaust bypass valve is provided at one end of the exhaust bypass air pipe close to the indoor exhaust chamber, and a non-woven cotton filter cloth is provided between the exhaust bypass air pipe and the indoor exhaust chamber. The exhaust air volume in the house passing through the exhaust bypass unit can be adjusted by adjusting the opening and closing size of the exhaust bypass valve, and the exhaust air in the house is filtered by the non-woven cotton filter cloth to ensure that the exhausted air in the house is clean.

[0013] Preferably, the return air bypass unit includes a return air bypass pipe, on which a return air bypass valve is provided. The two ends of the return air bypass pipe are respectively connected to the indoor exhaust chamber and the fresh air fan chamber, and a non-woven cotton filter cloth is provided between the return air bypass pipe and the indoor exhaust chamber. The return air volume entering the fresh air fan chamber passing through the return air bypass unit can be adjusted by adjusting the opening and closing size of the return air bypass valve, and the exhaust air in the house is filtered by the non-woven cotton filter cloth to ensure that the return air entering the fresh air fan chamber is clean.

[0014] Preferably, a cooling wet curtain is added at the inlet of the fresh air bypass pipe, and water spraying is carried out at the cooling wet curtain to cool the high-temperature fresh air from the outside to meet the temperature requirements in the house.

[0015] Preferably, non-woven cotton filter cloths are respectively arranged between the heat exchange core and the fresh air inlet, and between the heat exchange core and the exhaust air inlet to ensure that the incoming air entering the house and the exhaust air discharged to the environment are both clean.

[0016] Preferably, an indoor fresh air chamber is added between the fresh air fan chamber and the fresh air outlet. The fresh air fan outlet is connected to the indoor fresh air chamber, and the fresh air outlet is connected to the indoor fresh air chamber. The setting of the indoor fresh air chamber can reduce air turbulence, reduce noise, replace the air supply static pressure box, making the installation convenient and more beautiful.

[0017] Preferably, both the fresh air inlet and the exhaust air inlet are arranged on the side of the unit housing, which is convenient for the air duct to be connected to the house body. By reducing the use of air duct elbows, the system air resistance is reduced to the lowest level, further reducing the motor power and achieving energy conservation.

[0018] The beneficial effects of the present invention compared with the prior art are as follows:

[0019] The structure of the present invention is reasonably designed, and it can adjust the working conditions of the fresh air fan, exhaust air fan, fresh air bypass unit, exhaust air bypass unit and return air bypass unit according to the actual situations in different seasons and different breeding stages, realizing precise adjustment of heat recovery, temperature and humidity, air volume and energy consumption reduction; and an indoor fresh air chamber is added to reduce air turbulence, reduce noise, replace the air supply static pressure box, making the installation convenient and more beautiful; both the fresh air inlet and the exhaust air inlet are arranged on the side of the unit housing, reducing the use of air duct elbows, reducing the system air resistance to the lowest level, and further reducing the motor power to achieve energy conservation. Description of the Drawings

[0020] Figure 1 is the front view of the heat recovery ventilation and air conditioning unit for livestock and poultry breeding;

[0021] Figure 2 is the top view of the heat recovery ventilation and air conditioning unit for livestock and poultry breeding;

[0022] Figure 3 is the left view of the heat recovery ventilation and air conditioning unit for livestock and poultry breeding.

[0023] In the figure: 1. Unit housing; 2. Indoor fresh air chamber; 3. Partition board; 4. Indoor exhaust air chamber; 5. Non-woven cotton filter cloth; 6. Fresh air inlet; 7. Outdoor fresh air chamber; 8. Exhaust air outlet; 9. Exhaust air fan; 10. Exhaust air fan chamber; 11. Exhaust air bypass pipe; 12. Exhaust air bypass valve; 13. Fresh air bypass pipe; 14. Return air bypass valve; 15. Fresh air fan chamber; 16. Fresh air fan; 17. Cooling wet curtain; 18. Fresh air outlet; 19. Exhaust air inlet; 20. Heat exchange core body. Specific implementation manner

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] As Figures 1 - 3 , the heat recovery ventilation and air conditioning unit for livestock and poultry breeding described in the present invention includes a unit housing 1. Inside the unit housing 1, there are a heat exchange core body 20 and a partition board 3. The heat exchange core body 20 and the partition board 3 divide the internal space of the unit housing 1 into a fresh air fan chamber 15, an indoor exhaust air chamber 4, an outdoor fresh air chamber 7, and an exhaust air fan chamber 10. The fresh air fan chamber 15 communicates with the fresh air outlet 18, the indoor exhaust air chamber 4 communicates with the exhaust air inlet 19, the outdoor fresh air chamber 7 communicates with the fresh air inlet 6, and a fresh air inlet valve is provided at the fresh air inlet 6. The exhaust air fan chamber 10 communicates with the exhaust air outlet 8, and a fresh air fan 16 and an exhaust air fan 9 are respectively installed in the fresh air fan chamber 15 and the exhaust air fan chamber 10; one pair of opposite sides of the heat exchange core body 20 respectively communicate with the indoor exhaust air chamber 4 and the exhaust air fan chamber 10, and the other pair of opposite sides respectively communicate with the fresh air fan chamber 15 and the outdoor fresh air chamber 7; a fresh air bypass unit, an exhaust air bypass unit, and a return air bypass unit are further provided inside the unit housing 1. The fresh air bypass unit communicates with the outdoor environment and the fresh air fan chamber 15, the exhaust air bypass unit communicates with the indoor exhaust air chamber 4 and the exhaust air fan chamber 10, and the return air bypass unit communicates with the indoor exhaust air chamber 4 and the fresh air fan chamber 15.

[0026] In this embodiment:

[0027] The fresh air bypass unit includes a fresh air bypass pipe 13. A fresh air bypass valve is provided on the fresh air bypass pipe 13. The two ends of the fresh air bypass pipe 13 respectively communicate with the outdoor environment and the fresh air fan chamber 15; and a non-woven cotton filter cloth 5 is provided between the fresh air fan chamber 15 and the fresh air bypass pipe 13. The fresh air volume passing through the fresh air bypass unit can be adjusted by controlling the opening degree of the fresh air bypass valve, and the fresh air entering the fresh air fan chamber 15 is filtered by the non-woven cotton filter cloth 5 to ensure that the fresh air is clean.

[0028] The exhaust bypass unit includes an exhaust bypass duct 11. The two ends of the exhaust bypass duct 11 are respectively connected to the indoor exhaust chamber 4 and the exhaust fan chamber 10. An exhaust bypass valve 12 is provided at one end of the exhaust bypass duct 11 close to the indoor exhaust chamber 4, and a non-woven cotton filter cloth 5 is provided between the exhaust bypass duct 11 and the indoor exhaust chamber 4. The amount of indoor exhaust passing through the exhaust bypass unit can be adjusted by adjusting the opening and closing size of the exhaust bypass valve 12. And after the indoor exhaust passes through the non-woven cotton filter cloth 5, it is ensured that the exhausted indoor exhaust is clean.

[0029] The return air bypass unit includes a return air bypass duct. A return air bypass valve 14 is provided on the return air bypass duct. The two ends of the return air bypass duct are respectively connected to the indoor exhaust chamber 4 and the fresh air fan chamber 15, and a non-woven cotton filter cloth 5 is provided between the return air bypass duct and the indoor exhaust chamber 4. The amount of return air entering the fresh air fan chamber 15 through the return air bypass unit can be adjusted by adjusting the opening and closing size of the return air bypass valve 14. And after the indoor exhaust passes through the non-woven cotton filter cloth 5, it is ensured that the return air entering the fresh air fan chamber 15 is clean.

[0030] A cooling wet curtain 17 is added at the entrance of the fresh air bypass duct 13. Spraying action is carried out at the cooling wet curtain 17 to cool the high-temperature fresh air from the outside to meet the indoor temperature requirements; non-woven cotton filter cloths 5 are respectively provided between the heat exchange core 20 and the fresh air inlet 6, and between the heat exchange core 20 and the exhaust inlet 19, ensuring that the incoming air entering the house and the exhaust air discharged to the environment are both clean.

[0031] An indoor fresh air chamber 2 is added between the fresh air fan chamber 15 and the fresh air outlet 18. The outlet of the fresh air fan 16 is connected to the indoor fresh air chamber 2, and the fresh air outlet 18 is connected to the indoor fresh air chamber 2. The setting of the indoor fresh air chamber 2 can reduce air turbulence, reduce noise, replace the air supply static pressure box, making the installation convenient and more beautiful.

[0032] The motors used by the fresh air fan 16 and the exhaust fan 9 can both be selected as variable frequency motors, and the specific working states are described as follows.

[0033] During winter operation: The valve of the fresh air inlet 6 is in the open state. Fresh air path: Fresh air enters the outdoor fresh air chamber 7 from the fresh air inlet 6, then enters the fresh air fan chamber 15 through the heat exchange core 20, and then enters the house through the fresh air fan 16 and the fresh air outlet 18; Exhaust path: The indoor exhaust enters the indoor exhaust chamber 4 from the exhaust inlet 19, then enters the exhaust fan chamber 10 through the heat exchange core 20, and finally is discharged to the outside through the exhaust fan 9 and the exhaust outlet 8. During this process, heat exchange occurs when the fresh air and the exhaust air pass through the heat exchange core 20 to heat the fresh air, improve the temperature of the fresh air sent into the house, reduce the natural gas consumption of the indoor heater, and at this time, the exhaust bypass unit, the return air bypass unit and the fresh air bypass unit are all in a non-working state.

[0034] During summer operation: The fresh air bypass unit and the exhaust air bypass unit are in working condition, the return air bypass unit is in non-working condition, the fresh air inlet 6 valve is in the closed state. Fresh air path: Fresh air enters the fresh air fan room 15 through the fresh air bypass unit. When the fresh air passes through the cooling wet curtain 17, it is cooled to meet the temperature requirement in the house, and then is sent into the house through the fresh air fan 16 and the fresh air outlet 18; Exhaust air path: The exhaust air in the house enters the indoor exhaust air room 4 through the exhaust air inlet 19, then enters the exhaust air fan room 10 through the exhaust air bypass unit, and finally is discharged to the outside through the exhaust air fan 9 and the exhaust air outlet 8. During this process, there is no need for heat exchange between fresh air and exhaust air, the system resistance is small, and the fresh air fan 16 can be used with reduced frequency to reduce energy consumption.

[0035] During the season transition, when the outside environmental temperature is lower than the temperature in the house and the temperature difference is small, the ventilation volume of each part is adjusted by adjusting the opening degree of the fresh air inlet 6 valve and the opening degrees of the fresh air bypass unit, the exhaust air bypass unit and the return air bypass unit:

[0036] At this time, for the fresh air intake situation, it is set that the air supply volume of the fresh air fan 16 is 100%. The air intake volume through the fresh air inlet 6 - heat exchange core 20 - fresh air fan room 15 is 50%, the air intake volume through the fresh air bypass unit into the fresh air fan room 15 is 30%, and the air intake volume through the return air bypass unit into the fresh air fan room 15 is 20%. The final air intake volume entering the fresh air fan room 15 is sent into the house through the fresh air fan 16 and the fresh air outlet 18. During this process, the fresh air entering the fresh air fan room 15 through the fresh air bypass unit and the return air bypass unit does not pass through the heat exchange core 20. Therefore, the system resistance is reduced, the fresh air fan 16 can be used with reduced frequency, the energy consumption of the fresh air fan 16 is reduced, and 20% of the high-temperature return air entering the fresh air fan room 15 through the return air bypass unit can increase the supply air temperature of the fresh air and reduce the consumption of natural gas in the house;

[0037] At this time, regarding the exhaust situation in the house, it is set that the air volume entering the indoor exhaust chamber 4 from the chicken house is 100% of the rated air volume of the exhaust fan 9. At this time, the working air flow is also divided into three paths: The first path accounts for 50% of the rated air volume of the exhaust fan 9, and successively passes through the indoor exhaust chamber 4 - the heat exchange core 20 - the exhaust fan 9 - the exhaust outlet 8 and is discharged into the environment; The second path accounts for 30% of the rated air volume of the exhaust fan 9, and successively passes through the indoor exhaust chamber 4 - the exhaust bypass unit - the exhaust fan 9 - the exhaust outlet 8 and is discharged into the environment; The third path accounts for 20% of the rated air volume of the exhaust fan 9, and successively passes through the indoor exhaust chamber 4 - the return air bypass unit - the fresh air fan 16 - the fresh air outlet 18 and re-enters the house. That is, 20% of the above-mentioned fresh air intake situation is high-temperature return air; According to the above fresh air intake situation, it can be known that the actual fresh air volume sent into the chicken house is 80% of the rated air volume of the fresh air fan 16. At this time, the load of the exhaust fan 9 is 80% of the rated value, and 30% does not pass through the heat exchange core 20, so the system resistance will also decrease. Therefore, the exhaust fan 9 can also be used with a reduced frequency, and the energy consumption of the fan is reduced. In this cycle process, the fresh air has two temperature increase processes. The first time is that 50% fresh air and 50% exhaust air pass through the heat exchange core 20 for energy recovery to increase the temperature of the fresh air at the fresh air inlet 6; The second time is that 20% high-temperature return air is mixed into the fresh air to increase the supply air temperature at the fresh air outlet 18 again, reducing the consumption of natural gas in the house.

Claims

1. A heat recovery ventilation and air conditioning unit for livestock and poultry breeding, comprising a unit housing (1), characterized in that: Inside the unit housing (1), there is a heat exchange core (20) and a partition (3). The heat exchange core (20) and the partition (3) divide the internal space of the unit housing (1) into a fresh air fan chamber (15), an indoor exhaust air chamber (4), an outdoor fresh air chamber (7), and an exhaust air fan chamber (10). The fresh air fan chamber (15) is connected to the fresh air outlet (18), the indoor exhaust air chamber (4) is connected to the exhaust air inlet (19), the outdoor fresh air chamber (7) is connected to the fresh air inlet (6), and a fresh air inlet valve is provided at the fresh air inlet (6). The exhaust air fan chamber (10) is connected to the exhaust air outlet (8), and a fresh air fan (16) and an exhaust air fan (9) are respectively installed in the fresh air fan chamber (15) and the exhaust air fan chamber (10); One pair of opposite sides of the heat exchange core (20) are respectively connected to the indoor exhaust air chamber (4) and the exhaust air fan chamber (10), and the other pair of opposite sides are respectively connected to the fresh air fan chamber (15) and the outdoor fresh air chamber (7); Inside the unit housing (1), there are also a fresh air bypass unit, an exhaust air bypass unit, and a return air bypass unit. The fresh air bypass unit is connected to the outdoor environment and the fresh air fan chamber (15), the exhaust air bypass unit is connected to the indoor exhaust air chamber (4) and the exhaust air fan chamber (10), and the return air bypass unit is connected to the indoor exhaust air chamber (4) and the fresh air fan chamber (15); The fresh air bypass unit includes a fresh air bypass pipe (13). A fresh air bypass valve is provided on the fresh air bypass pipe (13). The two ends of the fresh air bypass pipe (13) are respectively connected to the outdoor environment and the fresh air fan chamber (15); And there is a non-woven cotton filter cloth between the fresh air fan chamber (15) and the fresh air bypass pipe (13); The exhaust air bypass unit includes an exhaust air bypass duct (11). The two ends of the exhaust air bypass duct (11) are respectively connected to the indoor exhaust air chamber (4) and the exhaust air fan chamber (10). An exhaust air bypass valve (12) is provided at one end of the exhaust air bypass duct (11) close to the indoor exhaust air chamber (4), and there is a non-woven cotton filter cloth (5) between the exhaust air bypass duct (11) and the indoor exhaust air chamber (4); The return air bypass unit includes a return air bypass pipe. A return air bypass valve (14) is provided on the return air bypass pipe. The two ends of the return air bypass pipe are respectively connected to the indoor exhaust air chamber (4) and the fresh air fan chamber (15), and there is a non-woven cotton filter cloth (5) between the return air bypass pipe and the indoor exhaust air chamber (4); During winter operation: The valve at the fresh air inlet (6) is in the open state. Fresh air path: Fresh air enters the outdoor fresh air chamber (7) from the fresh air inlet (6), then enters the fresh air fan chamber (15) through the heat exchange core (20), and then enters the house through the fresh air fan (16) and the fresh air outlet (18); Exhaust air path: The exhaust air in the house enters the indoor exhaust air chamber (4) from the exhaust air inlet (19), then enters the exhaust air fan chamber (10) through the heat exchange core (20), and finally is discharged to the outdoor through the exhaust air fan (9) and the exhaust air outlet (8); And at this time, the fresh air bypass unit, the exhaust air bypass unit, and the return air bypass unit are all in a non-operating state; During summer operation: The fresh air bypass unit and the exhaust air bypass unit are in working condition, the return air bypass unit is in non-working condition, the fresh air inlet (6) valve is in the closed state. Fresh air path: Fresh air enters the fresh air fan chamber (15) through the fresh air bypass unit. When the fresh air passes through the cooling wet curtain (17), it is cooled to meet the temperature requirement inside the house, and then is sent into the house through the fresh air fan (16) and the fresh air outlet (18); Exhaust air path: The exhaust air inside the house enters the indoor exhaust air chamber (4) through the exhaust air inlet (19), then enters the exhaust air fan chamber (10) through the exhaust air bypass unit, and finally is discharged to the outside through the exhaust air fan (9) and the exhaust air outlet (8). During seasonal transition, when the outside ambient temperature is lower than the temperature inside the house and the temperature difference is small, the ventilation volume of each part is adjusted by adjusting the opening degree of the fresh air inlet (6) valve and the opening degrees of the fresh air bypass unit, the exhaust air bypass unit and the return air bypass unit.

2. The livestock and poultry breeding heat recovery ventilation and air conditioning unit according to claim 1, characterized in that: A cooling wet curtain (17) is provided at the inlet of the fresh air bypass pipe (13).

3. The livestock and poultry breeding heat recovery ventilation and air conditioning unit according to claim 1, characterized in that: Non-woven cotton filter cloths (5) are respectively provided between the heat exchange core (20) and the fresh air inlet (6), and between the heat exchange core (20) and the exhaust air inlet (19).

4. The livestock and poultry breeding heat recovery ventilation and air conditioning unit according to any one of claims 1-3, characterized in that: An indoor fresh air chamber (2) is added between the fresh air fan chamber (15) and the fresh air outlet (18). The outlet of the fresh air fan (16) is connected to the indoor fresh air chamber (2), and the fresh air outlet (18) is connected to the indoor fresh air chamber (2).

5. The livestock and poultry breeding heat recovery ventilation and air conditioning unit according to claim 1, wherein: Both the fresh air inlet (6) and the exhaust air inlet (19) are provided on the side surface of the unit housing (1).

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