New air ventilation system for livestock and poultry breeding house with heat recovery function

Abstract

The present application relates to the technical field of livestock and poultry breeding, and discloses a new air ventilation system with heat recovery function for livestock and poultry breeding house, which comprises a wind pipe installed in the breeding house, the wind pipe is connected to the roof of the breeding house through a suspension assembly, a cavity one and a cavity two are arranged in the wind pipe, a waste heat recovery assembly is installed in the cavity one, a new air outlet is formed in the side wall of the wind pipe and communicated with the cavity two, a plurality of connecting pipes are connected to one side of the wind pipe, the other end of the connecting pipe is located outside the breeding house, a partition plate is arranged in the connecting pipe, and the connecting pipe is divided into an independent exhaust duct and an air inlet duct by the partition plate; the exhaust duct is communicated with the cavity one, and the air inlet duct is communicated with the cavity two. The new air ventilation system is convenient to install and fix, and has good waste heat recovery function.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of livestock and poultry breeding, and particularly relates to a new air ventilation system for livestock and poultry breeding house with heat recovery function. BACKGROUND

[0002] In the traditional livestock and poultry breeding house, air pollution in the house is the most common problem. With the development of society and the improvement of people's ideology, people begin to realize that scientific breeding is related to the health of thousands of families. The research direction of the present application is to improve, change and purify the air quality, provide a new air ventilation system for livestock and poultry breeding house, and the system can utilize the relatively high temperature in the breeding house, and finally provide a new air ventilation system for livestock and poultry breeding house with heat recovery function. SUMMARY

[0003] In order to solve the technical problems proposed in the background art, the present application provides a new air ventilation system for livestock and poultry breeding house with heat recovery function.

[0004] The present application adopts the following technical scheme: the new air ventilation system for livestock and poultry breeding house with heat recovery function comprises a wind pipe installed in the inside of the breeding house, the wind pipe is connected to the roof of the house through a suspension assembly, a cavity one and a cavity two are arranged in the wind pipe, a waste heat recovery assembly is installed in the cavity one, and a new air outlet is arranged on the side wall of the wind pipe and communicated with the cavity two.

[0005] A plurality of connecting pipes are connected to one side of the wind pipe, the other end of the connecting pipe is located outside the breeding house, and a partition plate is arranged in the connecting pipe, the connecting pipe is divided into independent exhaust air duct and air inlet duct by the partition plate.

[0006] The exhaust air duct is communicated with the cavity one, and the air inlet duct is communicated with the cavity two.

[0007] As a further improvement of the above scheme, a protective cover is installed at the end of the connecting pipe away from the wind pipe, an installation chamber and two communication chambers are arranged in the protective cover, the two communication chambers are respectively communicated with the exhaust air duct and the air inlet duct, a new air inlet and an exhaust air outlet are arranged on the shell of the protective cover and communicated with the two communication chambers, and two groups of power mechanisms are arranged in the installation chamber.

[0008] As a further improvement of the above-mentioned scheme, the propeller assembly is installed in the exhaust duct and the air inlet duct to facilitate rotation with the airflow, the propeller assembly comprises a fixed support capable of allowing airflow to pass through, and the fixed support is installed on the inner wall of the exhaust duct or the air inlet duct, the propeller comprises a center column, a blade rotatably sleeved outside the center column, a shell connected with the center column, and a sliding block distributed outside the shell, the sliding block is used for sliding connection with the inside of the exhaust duct or the air inlet duct along the length direction, and the fixed support and the center column are further connected through a distance adjusting mechanism, and a shaft hole is installed on the side of the center column away from the fixed support, and the shaft hole is used for detachable connection with one of the power mechanisms.

[0009] As a further improvement of the above-mentioned scheme, the power mechanism comprises a power motor and a power shaft, the power motor is arranged in the installation chamber, one end of the power shaft is connected with the output shaft of the power motor, and the other end of the power shaft can extend into the exhaust duct or the air inlet duct to be detachably connected with the shaft hole on the center column.

[0010] As a further improvement of the above-mentioned scheme, the distance adjusting mechanism comprises an electric push rod, a drive motor, a connecting plate, and an arc-shaped plate, wherein the drive motor is installed on the side of the center column close to the fixed support, the output shaft of the drive motor is connected with the connecting plate, one end of the electric push rod is installed on the fixed support, the output end of the electric push rod is connected with the connecting plate, a plurality of arc-shaped plates are distributed circumferentially on the connecting plate and arranged coaxially, an arc-shaped groove is formed in the center column and connected with the arc-shaped plate, the inner end of the arc-shaped groove is communicated with the shaft hole, the inner side of the arc-shaped plate is provided with a mounting groove, an electromagnet is arranged in the mounting groove, a movable pin capable of being magnetically attracted by the electromagnet is movably arranged in the mounting groove, a butt joint groove capable of cooperating with the movable pin is formed in the side surface of the power shaft, and when the movable pin cooperates with the butt joint groove, the propeller can rotate synchronously with the power shaft.

[0011] As a further improvement of the above-mentioned scheme, the suspension assembly comprises a suspension plate, a plurality of suspension rods fixed on the top surface of the suspension plate, and a plurality of connecting sleeves fixed on the bottom surface of the suspension plate, the bottom surface of the air pipe is provided with a threaded column corresponding to the connecting sleeve, the connecting sleeve and the threaded column are connected by screwing, and a anti-disengagement mechanism is further installed between the connecting sleeve and the threaded column.

[0012] As a further improvement of the above-mentioned scheme, the anti-disengagement mechanism comprises a connecting column fixed on the top surface of the threaded column, a movable rod fixed on the other end of the connecting column, and an inner block fixed on the inner side of the connecting sleeve, a groove is formed on the side of the inner block close to the movable rod, and a self-locking mechanism is installed in the groove to be clamped with the connecting column.

[0013] As a further improvement of the above-mentioned scheme, the self-locking mechanism comprises a clamping plate symmetrically slidingly arranged in the groove, a tooth plate fixed at the top end of the clamping plate, a clamping block fixed at the bottom end of the clamping plate, a clamping groove for clamping the clamping block formed in the side surface of the connecting column, two rotating shafts symmetrically and rotatably arranged in the groove, a gear one and a gear two arranged on the two rotating shafts, the gear one being used for meshing with the rack on the side surface of the movable rod, and the gear two being used for meshing with the adjacent tooth plate.

[0014] The movable rod and the inner wall of the groove are further connected through a plurality of elastic extension mechanisms.

[0015] As a further improvement of the above-mentioned scheme, the waste heat recovery assembly comprises a heat-conducting lining fixed in the inner side of the cavity one, a plurality of perforations are formed in the heat-conducting lining along the length direction of the air pipe, a heat exchange pipe for conveying moisture is arranged in the perforation, a plurality of transverse mounting holes and vertical holes are formed in the heat-conducting lining, the top of the vertical hole is communicated with the perforation, the middle of the vertical hole is communicated with the mounting hole, a connecting hole corresponding to the vertical hole is formed in the heat exchange pipe, a valve capable of lifting is arranged at the connecting hole, the valve is lifted to make the moisture in the heat exchange pipe enter the vertical hole, the valve is columnar, an annular groove is formed in the middle of the valve, a water passage hole communicated with the vertical hole is formed in the bottom of the annular groove, and the outer wall of the valve can be tightly fitted with the inner wall of the connecting hole.

[0016] A blocking mechanism is arranged at the connecting position of the vertical hole and the mounting hole, the blocking mechanism is linked with the valve, and the blocking mechanism is used for blocking the vertical hole, a water pipe is movably arranged in the mounting hole, an external connecting pipe is connected to the outer end of the water pipe through a connecting flange, and a locking bolt is arranged on the connecting flange, so that the water pipe can slide horizontally in the mounting hole.

[0017] As a further improvement of the above-mentioned scheme, the blocking mechanism comprises a partition plate and a connecting rod, one end of the partition plate is slidingly connected to the inner wall of the mounting hole, the other side of the partition plate is located in the vertical hole, a slot capable of receiving the partition plate is formed in the side wall of the vertical hole, a restoring spring is arranged in the slot to abut against the partition plate, and when the partition plate is inserted into the slot, the partition plate completely blocks the vertical hole, so that the moisture in the vertical hole enters the mounting hole.

[0018] Compared with the prior art, the present application has the following advantages:

[0019] The fresh air ventilation system provided by the present application comprises an air pipe installed in the interior of a breeding house, the air pipe is connected to the roof of the house through a suspension assembly, the air pipe is provided with a cavity one and a cavity two, the cavity one is provided with a waste heat recovery assembly, a fresh air outlet communicated with the cavity two is formed in the side wall of the air pipe, one side of the air pipe is connected with a plurality of connecting pipes, the other end of the connecting pipe is located outside the breeding house, a partition plate is arranged in the connecting pipe to divide the connecting pipe into independent exhaust air channels and air inlet channels, the exhaust air channel is communicated with the cavity one, and the air inlet channel is communicated with the cavity two.

[0020] The ventilation system provided by the application can work independently or jointly, and the power source can utilize wind power or directly utilize a motor to drive, so that the work is convenient and can be adjusted according to actual conditions.

[0021] The suspension assembly provided by the application is convenient and fast to install and disassemble, and the anti-dropping mechanism can make the structure more stable and have better safety.

[0022] The waste heat recovery assembly provided by the application can conveniently install heat exchange pipes in the air pipe, utilize the heat energy in the high-temperature gas, heat the water, conveniently take out the water in the heat exchange pipes in real time through the adjustment of the valve, and save energy more. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the application;

[0024] Figure 2 It is an enlarged view of A in the application; Figure 1

[0025] Figure 3 It is an enlarged view of B in the application; Figure 1

[0026] Figure 4 It is an enlarged view of C in the application; Figure 1

[0027] Figure 5 It is an enlarged view of D in the application; Figure 3

[0028] Figure 6 It is a schematic diagram of the structure of the propeller of the application;

[0029] MAIN SYMBOL DESCRIPTION:

[0030] ​​​​In the figure: air pipe 1, fresh air outlet 2, suspension plate 3, suspension rod 4, connecting sleeve 5, threaded column 6, air guide pipe 7, interface 8, exhaust duct 9, connecting pipe 10, partition 11, air inlet 12, maintenance 13, fresh air inlet 14, protective cover 15, exhaust port 16, heat-conducting lining 17, inner block 18, clamping plate 19, connecting column 20, clamping groove 21, clamping block 22, groove 23, movable pin 24, center column 25, butt joint groove 27, mounting groove 28, electromagnet 29, rotary groove 30, drive motor 31, electric push rod 32, connecting plate 33, arc plate 34, movable rod 35, rotating shaft 36, sliding groove 37, toothed plate 38, gear one 39, gear two 40, elastic extension mechanism 41, perforation 42, heat exchange pipe 43, valve 44, annular groove 45, water passage 46, connecting rod 47, insertion groove 48, partition 49, mounting hole 50, external connecting pipe 51, locking bolt 52, connecting flange 53, water passage pipe 54, paddle 55, shell 57, sliding block 58, fixed support 500, propeller 600, power motor 700, belt transmission mechanism 800. DETAILED DESCRIPTION

[0031] In the following, the application will be further described in conjunction with the drawings and specific embodiments, it should be noted that the following described embodiments or technical features can be combined to form new embodiments without conflict.

[0032] Embodiment 1

[0033] Referring to Figures 1-6 , the new air ventilation system with heat recovery function for livestock and poultry breeding house provided in the scheme includes an air pipe 1 installed inside the breeding house, the air pipe 1 is connected to the roof of the house through a suspension assembly, the air pipe 1 is provided with a cavity one and a cavity two, the cavity one is provided with a waste heat recovery assembly, and the side wall of the air pipe 1 is further provided with a fresh air outlet 2 communicated with the cavity two; a grille capable of adjusting the direction of the air outlet can be installed at the air outlet, and an air guide pipe 7 is installed at the bottom of the air pipe 1, the air guide pipe 7 is communicated with the cavity one, and an exhaust fan is installed in the air guide pipe 7, which is used to guide the gas in the breeding house into the air pipe 1 and finally exhaust the breeding house.

[0034] Referring to Figure 1 , a plurality of connecting pipes 10 are connected to one side of the air pipe 1, the other end of the connecting pipe 10 is located outside the breeding house, and the connecting pipe 10 is provided with a partition 11, which divides the inside of the connecting pipe 10 into independent exhaust ducts 9 and air inlets 12; the side surface of the air pipe 1 is fixed with an interface 8, which facilitates the insertion of one end of the connecting pipe 10 into the interface 8, and after the end of the connecting pipe 10 is inserted into the interface 8, the position of the two can be fixed by bolts.

[0035] In the scheme, the air exhaust duct 9 and the cavity one are communicated, the air inlet duct 12 and the cavity two are communicated, that is, the air vent opening the communication between the air exhaust duct 9 and the cavity one or the air inlet duct 12 and the cavity two is arranged on the side shell of the air pipe 1.

[0036] The connecting pipe 10 is provided with a protective cover 15 at the end away from the air pipe 1, the protective cover 15 can be made of plastic, so that the quality of the device is lighter, the lightweight design, the protective cover 15 is provided with an installation chamber (not marked) and two communication chambers (not marked) inside, the two communication chambers are respectively communicated with the air exhaust duct 9 and the air inlet duct 12, and the shell of the protective cover 15 is provided with a fresh air inlet 14 and an air exhaust port 16 communicated with the two communication chambers respectively, the fresh air inlet is used for introducing external fresh air, the air exhaust port 16 is used for discharging the polluted gas in the breeding house, and the installation chamber is provided with two groups of power mechanisms.

[0037] In order to utilize the kinetic energy of the exhaust gas, the propeller assembly is installed in the air exhaust duct 9 and the air inlet duct 12, so as to rotate with the airflow, the propeller assembly includes a fixed support 500 and a propeller 600, wherein the fixed support 500 can pass the airflow, and the fixed support 500 is installed on the inner wall of the air exhaust duct 9 or the air inlet duct 12, the propeller 600 includes a center column 25, a paddle 55 sleeved on the outer side of the center column 25, a shell 57 connected with the center column 25 and a sliding block 58 distributed on the outer side of the shell, the sliding block 58 is used for sliding connection with the inside of the air exhaust duct 9 or the air inlet duct 12 along the length direction, the inner wall of the air exhaust duct 9 or the air inlet duct 12 is provided with a sliding groove slidingly connected with the sliding block along the length direction, and the fixed support 500 and the center column 25 are further connected through a distance adjusting mechanism, the center column 25 is provided with a shaft hole on the side away from the fixed support 500, the shaft hole is used for detachable connection with one of the power mechanisms, through the above structure, the position of the propeller assembly in the air exhaust duct 9 or the air inlet duct 12 can be changed, which is convenient for separating or combining with the power mechanism to adapt to different working conditions.

[0038] The power mechanism includes a power motor 700 and a power shaft 900. The two power shafts 900 are also linked by a belt drive mechanism 800. The power motor 700 is installed in the installation chamber. One end of the power shaft 900 is connected to the output shaft of the power motor 700, and the other end of the power shaft 900 can extend into the exhaust duct 9 or the air inlet duct 12 to be detachably connected to the shaft hole on the central column 25. The motor can actively drive the power shaft 900 to rotate, thereby driving the propeller assembly in the exhaust duct or air inlet duct to work. When the motor 700 is not working, the propeller assembly in the exhaust duct 9 is connected with the corresponding power shaft 900. When the exhaust fan is working, the airflow in the exhaust duct can drive the propeller assembly to drive the power shaft 900 to rotate. At this time, the two power shafts 900 are linked through the belt drive mechanism 800, which makes the propeller assembly in the air inlet duct 12 work. The propeller 600 in the propeller assembly is installed in the opposite direction to the propeller in the air inlet duct. Thus, when it rotates, it can automatically introduce fresh air from the outside into the air duct 1, and finally blow it into the breeding house from the fresh air outlet 2.

[0039] In this design, a distance adjustment mechanism is incorporated to allow the two sets of propeller assemblies in the exhaust and intake ducts to operate independently. This facilitates the separation or connection of the power shaft and the corresponding propeller 600. The distance adjustment mechanism includes an electric push rod 32, a drive motor 31, a connecting plate 33, and an arc-shaped plate 34. The drive motor 31 is mounted on the side of the central column 25 near the fixed bracket 500, and its output shaft is connected to the connecting plate 33. One end of the electric push rod 32 is mounted on the fixed bracket 500, and its output end is connected to the connecting plate 33. The connecting plate 33 has several arc-shaped plates 34 arranged coaxially in a circumferential direction. The central column 25 has an arc-shaped groove 30 that is rotatably connected to the arc-shaped plates 34. The inner end of the rotary groove 30 is connected to the shaft hole. The inner side of the arc-shaped plate has a mounting groove 28. An electromagnet 29 is installed in the mounting groove 28. A movable pin 24 that can magnetically attract the electromagnet is also movably installed in the mounting groove 28. The side of the power shaft 900 has a docking groove 27 that can cooperate with the movable pin 24. When the movable pin 24 and the docking groove 27 are engaged, the propeller 600 can rotate synchronously with the power shaft 900. When the power shaft 900 and the center column 25 need to be connected, the electromagnet 29 is energized, attracting the movable pin 24 to move towards it in sequence, thereby separating the movable pin from the docking groove 27. At this time, the electric push rod 32 pulls the center column 25, which can drive the propeller 600 to separate from the power shaft 900. During installation, the electric push rod 32 works in the opposite direction, so that one end of the power shaft 900 is inserted into the shaft hole in the center column 25. Then the electromagnet is de-energized, and the movable pin moves away from the electromagnet under the action of the return spring, while the drive motor 31 works at the same time until the movable pin can be inserted into the docking groove.

[0040] As an optional embodiment of the present invention, refer to Figure 1 , Figure 3 as well as Figure 5 To facilitate duct installation, the suspension assembly in this design includes a suspension plate 3, several suspension rods 4 fixed to the top surface of the suspension plate 3, and several connecting sleeves 5 fixed to the bottom surface of the suspension plate 3. The suspension plate, suspension rods, and connecting sleeves are all made of high-strength stainless steel, which can improve strength and make the installation more secure. The bottom surface of the duct 1 is equipped with threaded posts 6 corresponding to the connecting sleeves 5, and the connecting sleeves 5 and the threaded posts 6 are connected by a spiral. An anti-detachment mechanism is also installed between the connecting sleeves 5 and the threaded posts 6.

[0041] In this design, the anti-detachment mechanism includes a connecting post 20 fixed to the top surface of the threaded post 6, a movable rod 35 fixed to the other end of the connecting post 20, and an inner block 18 fixed inside the connecting sleeve 5. The inner block 18 has a groove 23 on the side near the movable rod 35, and a self-locking mechanism is installed in the groove 23. The self-locking mechanism is used to engage with the connecting post 20. The anti-detachment mechanism can be automatically installed during the spiral connection process between the connecting sleeve 5 and the threaded post 6. Being internally located and not easily damaged, it has good self-locking properties, making the structure of the installed duct 1 more stable and extending its service life.

[0042] In this design, the self-locking mechanism includes a clamping plate 19 symmetrically slidably disposed in the groove 23, a toothed plate 38 fixed to the top of the clamping plate 19, a locking block 22 fixed to the bottom of the clamping plate 19, a locking groove 21 for engaging with the locking block 22 on the side of the connecting column 20, and two rotating shafts 36 symmetrically rotatably mounted in the groove 23. Each of the two rotating shafts 36 is equipped with a gear 1 39 and a gear 2 40. The gear 1 39 is used to mesh with the rack on the side of the movable rod 35, and the gear 2 40 is used to mesh with the adjacent toothed plate 38.

[0043] The movable rod 35 and the inner wall of the groove 23 are also connected by several elastic telescopic mechanisms 41.

[0044] With the above scheme, when the connecting sleeve 5 and the connecting column are connected by a screw, the connecting column 20 can push the movable rod 35, thereby driving the gear 40 to rotate, which in turn drives the gear 39 to rotate synchronously, thereby driving the toothed plate 38 to move, so as to drive the clamping plate 19 to gradually approach the connecting column 20, and finally make the locking block 22 lock into the locking groove 21. The two can bear the vertical force and play the role of suspending the air duct 1, avoiding structural instability caused by the loosening of the connection between the connecting sleeve and the threaded column.

[0045] Example 2:

[0046] Reference Figure 1 and Figure 2In this scheme, to better utilize the heat in the breeding shed, the waste heat recovery component includes a heat-conducting liner 17 fixed inside the cavity. The heat-conducting liner 17 is made of a high thermal conductivity material. Perforations 42 are formed inside the heat-conducting liner 17 along the length of the air duct 1. Heat exchange pipes 43 for conveying water are installed inside the perforations 42. Water can be stored or circulated within the heat exchange pipes 43. The heat-conducting liner 17 also has several horizontal mounting holes 50 and vertical holes (not shown). The top of the vertical holes communicates with the perforations 42, and the middle of the vertical holes communicates with the mounting holes 50. The heat exchange tube 43 is connected to the vertical hole and has a connection hole (not shown). A liftable valve 44 is installed at the connection hole. The valve 44 is raised and lowered to allow water in the heat exchange tube 43 to enter the vertical hole. The valve is cylindrical and has an annular groove 45 in the middle. A water passage hole 46 connecting to the vertical hole is opened at the bottom of the annular groove 45. The outer wall of the valve can be sealed and fitted with the inner wall of the connection hole. By controlling the raising and lowering of the valve 44, water in the heat exchange tube 43 can be discharged, thus making use of the water in the heat exchange tube 43 and saving more energy.

[0047] Reference Figure 2 In this design, a blocking mechanism is provided at the connection between the vertical hole and the mounting hole 50. The blocking mechanism is linked with the valve 44 and is used to block the vertical hole. A water pipe 54 is movably inserted into the mounting hole. The outer end of the water pipe 54 is connected to an outer pipe 51 via a connecting flange 53. A locking bolt 52 is installed on the connecting flange 53 to allow the water pipe 54 to slide horizontally in the mounting hole 50. As the locking bolt 52 gradually rotates, it pushes the connecting flange 53, causing the water pipe 54 to slide horizontally in the mounting hole 50, thereby pushing the partition 49 to move, ultimately allowing the partition 49 to be inserted into the slot 48.

[0048] Reference Figure 2 The blocking mechanism includes a partition plate 49 and a connecting rod 47. One end of the partition plate 49 is slidably connected to the inner wall of the mounting hole 50, and the other side of the partition plate 49 is located in the vertical hole. The side wall of the vertical hole is provided with a slot 48 that can receive the partition plate 49. A return spring is provided in the slot 48 to abut the partition plate 49. When the partition plate 49 is inserted into the slot 48, it completely blocks the vertical hole, so that the water in the vertical hole can enter the mounting hole.

[0049] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A fresh air exchange system for livestock and poultry farmhouses with heat recovery function, characterized in that, The system includes air ducts installed inside the breeding shed. The air ducts are connected to the roof of the shed via a suspension assembly. The air ducts are provided with a first cavity and a second cavity. A waste heat recovery assembly is installed in the first cavity. A fresh air outlet communicating with the second cavity is also opened on the side wall of the air duct. One side of the air duct is connected to several connecting pipes, and the other end of the connecting pipe is located outside the breeding house. A partition is installed inside the connecting pipe, which divides the inside of the connecting pipe into independent exhaust ducts and air inlets. The exhaust duct is connected to cavity one, and the air inlet duct is connected to cavity two; The end of the connecting pipe away from the air duct is equipped with a protective cover. The protective cover contains an installation chamber and two connecting chambers. The two connecting chambers are respectively connected to the exhaust duct and the air inlet duct. The shell of the protective cover has a fresh air inlet and an exhaust outlet that are respectively connected to the two connecting chambers. The installation chamber is equipped with two sets of power mechanisms. The power mechanism includes a power motor and a power shaft. The power motor is installed in the installation chamber. One end of the power shaft is connected to the output shaft of the power motor, and the other end of the power shaft can extend into the exhaust duct or the air inlet duct to be detachably connected to the shaft hole on the central column. Both the exhaust duct and the intake duct are equipped with propeller assemblies to facilitate rotation with the airflow. The propeller assembly includes a fixed bracket and a propeller. The fixed bracket allows airflow to pass through and is installed on the inner wall of the exhaust duct or intake duct. The propeller includes a central column, blades rotatably mounted on the outside of the central column, a housing connected to the central column, and sliders distributed on the outside of the housing. The sliders are used to slide along the length of the interior of the exhaust duct or intake duct. The fixed bracket and the central column are also connected by a distance adjustment mechanism. A shaft hole is installed on the side of the central column away from the fixed bracket. The shaft hole is used to detachably connect to one of the power mechanisms. The distance adjustment mechanism includes an electric push rod, a drive motor, a connecting plate, and an arc-shaped plate. The drive motor is installed on the side of the central column near the fixed bracket, and its output shaft is connected to the connecting plate. One end of the electric push rod is installed on the fixed bracket, and its output end is connected to the connecting plate. Several arc-shaped plates are circumferentially distributed and coaxially arranged on the connecting plate. An arc-shaped groove is provided in the central column to rotatably connect with the arc-shaped plates, and the inner end of the rotatable groove is connected to the shaft hole. An installation groove is provided on the inner side of the arc-shaped plate, and an electromagnet is provided in the installation groove. A movable pin that can magnetically attract the electromagnet is also movably provided in the installation groove. A docking groove is provided on the side of the power shaft to cooperate with the movable pin. When the movable pin and the docking groove are engaged, the propeller can rotate synchronously with the power shaft.

2. The fresh air exchange system for livestock and poultry breeding sheds with heat recovery function as described in claim 1, characterized in that, The suspension assembly includes a suspension plate, several suspension rods fixed to the top surface of the suspension plate, and several connecting sleeves fixed to the bottom surface of the suspension plate. The bottom surface of the air duct is equipped with threaded posts corresponding to the connecting sleeves, and the connecting sleeves and threaded posts are connected by a spiral. An anti-detachment mechanism is also installed between the connecting sleeves and threaded posts.

3. The fresh air exchange system for livestock and poultry breeding sheds with heat recovery function as described in claim 2, characterized in that, The anti-detachment mechanism includes a connecting column fixed to the top surface of the threaded column, a movable rod fixed to the other end of the connecting column, and an inner block fixed to the inside of the connecting sleeve. The inner block has a groove on the side near the movable rod, and a self-locking mechanism is installed in the groove. The self-locking mechanism is used to engage with the connecting column.

4. The fresh air exchange system for livestock and poultry breeding sheds with heat recovery function as described in claim 3, characterized in that, The self-locking mechanism includes a clamping plate symmetrically slidably disposed in a groove, a toothed plate fixed to the top of the clamping plate, a locking block fixed to the bottom of the clamping plate, a locking groove for engaging with the locking block on the side of the connecting column, and two rotating shafts symmetrically rotatably mounted in the groove. Gear 1 and Gear 2 are mounted on each of the two rotating shafts. Gear 1 is used to mesh with the rack on the side of the movable rod, and Gear 2 is used to mesh with the adjacent toothed plate. The movable rod and the inner wall of the groove are also connected by several elastic telescopic mechanisms.

5. The fresh air exchange system for livestock and poultry breeding sheds with heat recovery function as described in claim 4, characterized in that, The waste heat recovery assembly includes a heat-conducting liner fixed inside the cavity. The heat-conducting liner has perforations along the length of the duct. Heat exchange tubes for conveying water are installed in the perforations. The heat-conducting liner also has several horizontal mounting holes and vertical holes. The top of the vertical holes is connected to the perforations, and the middle of the vertical holes is connected to the mounting holes. The heat exchange tubes have connection holes corresponding to the vertical holes. A liftable valve is installed at the connection hole. The valve is raised and lowered to allow water in the heat exchange tubes to enter the vertical holes. The valve is columnar, and an annular groove is opened in the middle of the valve. A water passage hole communicating with the vertical holes is opened at the bottom of the annular groove, and the outer wall of the valve can seal and fit with the inner wall of the connection hole. A blocking mechanism is also provided at the connection between the vertical hole and the mounting hole. The blocking mechanism is linked with the valve and is used to block the vertical hole. A water pipe is movably inserted into the mounting hole. The outer end of the water pipe is connected to an outer pipe through a connecting flange. A locking bolt is installed on the connecting flange so that the water pipe can slide horizontally in the mounting hole.

6. The fresh air exchange system for livestock and poultry breeding sheds with heat recovery function as described in claim 5, characterized in that, The blocking mechanism includes a partition and a connecting rod. One end of the partition is slidably connected to the inner wall of the mounting hole, and the other side of the partition is located in the vertical hole. The side wall of the vertical hole is provided with a slot that can receive the partition. A return spring is provided in the slot to abut the partition. When the partition is inserted into the slot, it completely blocks the vertical hole, so that the water in the vertical hole can enter the mounting hole.

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