A ventilation method and agricultural ventilation system

Abstract

The invention discloses a ventilation method and an agricultural ventilation system, which belong to the field of ventilation equipment. A ventilation method comprises the following steps: S1. Splicing: selecting a corresponding number of air supply sections and air inlet structures according to the size of a site, splicing the air supply sections in sequence to form an air supply duct and connecting it to the air inlet structure; S2. Hoisting: hoisting the air supply duct and the air inlet structure above the site after the splicing is completed through the lifting rings on the air supply sections for hanging; S3. Adjusting: adjusting the opening size of the air valve in the outlet of the air supply section in sequence along the moving direction of the air flow in the air supply duct until the air flow rates of multiple air outlet pipes on the air supply duct are the same; S4. Locking: locking the position of the air valve after the adjustment is completed to keep the air output of the multiple air outlet pipes stable, and the air supply ducts can be assembled and used according to actual conditions, and the later modification is easy, and the air output is uniform to meet the needs of plant and animal growth.

Description

Technical Field

[0001] The invention relates to the field of ventilation equipment, and in particular to a ventilation method and an agricultural ventilation system. Background Art

[0002] The traditional ventilation system currently used in agriculture has large air duct resistance, uncontrollable air flow and high energy consumption. Since the environmental controller of the traditional ventilation system is not connected with the fan's power, speed, air volume, static pressure, temperature, humidity and other parameters, the output air volume of the traditional ventilation system is inaccurate and cannot meet the demand for quantitative air supply in different environments throughout the year.

[0003] The existing patent application with publication number CN108781925A discloses a ventilation device for an agricultural greenhouse ventilation system, including a greenhouse body, a plurality of wind holes are opened on both sides of the greenhouse body, and a ventilation mechanism is provided at each wind hole, and the ventilation mechanism includes a support plate, and the plurality of support plates are fixed together by connecting rods, and the two support plates placed at the ends are each provided with a lifting mechanism, and the support plates are provided with baffles and fans, and the baffles are placed above the fans, and the fans lead out two electrical contacts through wires, and the electrical contacts are placed on the top of the support plates, and a horizontally placed contact electric plate is provided above the support plates, and the contact electric plate is provided with contact grooves matching the electrical contacts, and the contact electric plate is connected to the mains. The ventilation device cannot accurately adjust the air volume according to the actual environment, cannot perform targeted air supply, and the layout is not flexible and convenient enough. Summary of the invention

[0004] One of the purposes of the present invention is to provide a ventilation method, which solves the problems of inaccurate air flow and inflexible installation of existing agricultural air supply systems.

[0005] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0006] A ventilation method comprises the following steps:

[0007] S1. Splicing: Select a corresponding number of air supply sections and air inlet structures according to the size of the site, and splice the air supply sections in sequence to form an air supply duct and connect it to the air inlet structure;

[0008] S2. Hoisting: hoist the air supply duct and the air inlet structure after splicing to the top of the site through the lifting ring on the air supply section for hanging;

[0009] S3. Adjustment: adjusting the opening of the air valve in the outlet of the air supply section in sequence along the moving direction of the air flow in the air supply duct until the air flow rates of the multiple air outlet pipes on the air supply duct are the same;

[0010] S4. Locking: After the adjustment is completed, the position of the air valve is locked to keep the air volume of the multiple air outlet pipes stable. It can be assembled and used according to actual conditions, and is easy to modify later. The air volume is uniform and meets the needs of plant and animal growth.

[0011] Preferably, the step of adjusting the fan air volume and the air valve opening comprises: step S3.1, extracting the target air volume: fitting the air volume required for the current temperature according to the temperature-air volume value table input by the user and the temperature value collected by the current temperature sensor;

[0012] Step 3.2, input the working parameters of the fan: the working parameters include air volume, pressure, power and speed characteristics and the control target value of temperature-air volume;

[0013] Step 3.3, extracting the target air volume: processing the input information, extracting the target air volume or calculating the target air volume to be output according to the equivalent transformation;

[0014] Step 3.4, control output: The speed of the fan is adjusted by PID method and the fan feeds back the speed signal for monitoring, so as to achieve accurate air supply according to environmental changes and meet the needs of different types of agricultural production.

[0015] The second purpose of the present invention is to provide an agricultural ventilation system, which solves the problems of large air supply resistance and inaccurate control of air supply volume in existing ventilation systems.

[0016] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0017] An agricultural ventilation system includes an air inlet structure, an air supply duct and a plurality of air outlet pipes, wherein the air inlet structure is arranged on one end of the air supply duct, and a plurality of air outlet pipes are arranged on the air supply duct, the air supply duct includes a plurality of air supply sections, and the plurality of air supply sections are detachably connected in sequence, and the plurality of air supply sections are connected to the plurality of air outlet pipes in a one-to-one correspondence, and air valves are arranged in the plurality of air outlet pipes, and the air valves control the opening of the air outlet pipes, and the opening of the air valves gradually increases along the air flow direction of the air supply duct.

[0018] Preferably, a plurality of lifting rings are further included, and the lifting rings are arranged above the two ends of the air outlet pipe to facilitate movement and use during transportation and assembly.

[0019] Preferably, a flexible connecting pipe is further included, and the flexible connecting pipe is detachably arranged on the air supply duct, and is used for arranging the air supply duct at a corner, so that it can be used in a small area.

[0020] Preferably, a sealing cover is further included, which is arranged at the end of the air supply duct to close one end of the air supply duct. The whole ventilation system can be flexibly configured in the installation site, and the original air supply duct can be reused after the purpose of the site is changed.

[0021] Preferably, the air outlet pipe is provided with a reducer, and the reducer is arranged close to the outlet of the air outlet pipe to increase the flow rate of the air outlet pipe and realize fixed-point targeted ventilation.

[0022] Preferably, the air inlet structure includes an air inlet hood, a fan and a adapter tube, the fan is arranged in the air inlet hood, one end of the adapter tube is connected to the fan, and the other end is connected to the air supply duct, and the adapter tube is used to connect fans of different specifications for use, and the selection and configuration are flexible and convenient.

[0023] Furthermore, it also includes an environmental controller and a plurality of air valve controllers, wherein the air valve controllers are arranged on the air outlet ducts one by one, and the plurality of air valve controllers are respectively connected to the environmental controller, and the environmental controller is used to control the air valve controllers according to the ambient temperature and humidity to adjust the opening size of the air valve, and the air valve controllers individually control the opening of the air valve so that each of the air outlet ducts can operate independently to achieve precise air control.

[0024] Preferably, along the air flow direction of the air supply duct, the diameters of the plurality of air outlet pipes decrease successively, so that the flow velocity and flow rate of the air outlet can be controlled to be the same, thereby achieving fixed-point targeted ventilation.

[0025] The beneficial effects of the present invention are:

[0026] (1) This ventilation method is implemented using an agricultural ventilation system. It can be assembled in an assembled manner and installed flexibly according to the on-site conditions. After the assembly is completed, it is hoisted together. Finally, according to the actual flow rate, the opening size of the air valve is adjusted one by one to ensure the same air flow rate. It can also be adjusted according to changes in the environment to achieve the effect of adapting to ventilation use throughout the year.

[0027] (2) The agricultural ventilation system is provided with an air inlet structure, an air supply duct and a plurality of air outlet ducts. The air inlet structure and the air supply duct are detachably connected. The air supply duct is divided into a plurality of air outlet sections and each section is provided with an air outlet duct. The air outlet sections are detachably connected. By assembling air outlet ducts of different lengths and numbers, it can meet the use of agricultural sites of different areas. The air outlet duct is arranged along the air flow direction in the air supply duct. An air valve is arranged in the air outlet duct to control the air flow rate of the air outlet duct. The air outlet close to the air inlet structure has a small air outlet resistance, while the air outlet far from the air inlet structure has a large air outlet resistance. The opening of the air valve is controlled to gradually increase along the air flow direction, so that the air supply flow rate of each air outlet duct is the same. As the climate changes throughout the year, the opening of the air valve is adjusted so that the air supply flow rate of the air outlet duct can be maintained the same, thereby improving the stability of the agricultural environment and reducing the energy consumption of air supply.

[0028] (3) The air supply duct of the agricultural ventilation system includes multiple air supply sections, each of which is provided with a lifting ring. After the ventilation system is assembled, it can be hoisted above the site with the lifting ring, which is convenient and reliable to install. The air supply duct also includes a flexible connecting pipe, which can be used at corners, so that the air supply duct can adapt to different sites. In addition, a reducer is provided on the air outlet, which is close to the air outlet and can increase the air flow rate at the outlet.

[0029] (4) The agricultural ventilation system is also equipped with an environmental controller and an air valve controller. The environmental controller can change the air valve through the air valve controller according to the changes in the temperature and humidity of the environment, thereby adjusting the air flow at the outlet. Each air valve controller independently controls the opening of each air valve, so that the air flow rate of each section of the air outlet pipe is the same. Along the air supply direction, the diameter of the air outlet pipe decreases successively, reducing the resistance to air flow and ensuring the air flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 An axonometric view of the agricultural ventilation system provided by the present invention;

[0031] Figure 2 A cross-sectional view of an agricultural ventilation system provided by the present invention;

[0032] Figure 3 A control flow chart of the agricultural ventilation system provided by the present invention;

[0033] Figure 4 A system composition diagram of the agricultural ventilation system provided by the present invention;

[0034] Figure 5 The agricultural ventilation system diagram provided for Example 2;

[0035] Figure 6 This is a diagram of the agricultural ventilation system provided in Example 3.

[0036] Reference numerals:

[0037] 1. Air inlet structure; 101. Air inlet cover; 102. Fan; 103. Transfer pipe; 2. Air supply duct; 3. First air supply section; 4. Lifting ring; 5. First air outlet duct; 51. Reducer; 6. Air valve controller; 7. Air valve; 8. Second air supply section; 9. Second air outlet duct; 10. Step structure; 11. Sealing cover; 12. Flexible connecting pipe; 13. Environmental controller. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1

[0040] like Figure 1-Figure 4 As shown, the present embodiment discloses an agricultural ventilation system, comprising an air inlet structure 1, an air supply duct 2 and a plurality of air outlet ducts, the air inlet structure 1 is arranged on one end of the air supply duct 2, the plurality of air outlet ducts are arranged on the air supply duct 2, the air supply duct 2 comprises a plurality of air supply sections, the plurality of air supply sections are detachably connected in sequence, the plurality of air supply sections are connected to the plurality of air outlet ducts one by one, an air valve 7 is arranged in the plurality of air outlet ducts, the air valve 7 controls the opening of the air outlet duct, along the air flow direction of the air supply duct 2, the opening of the air valve 7 gradually increases, along the air supply direction, the air flow resistance increases, the opening of the air valve 7 is changed to balance the air supply flow rate, and air is supplied through the assembled ventilation system, so that the ventilation system can be used in different agricultural fields, the air outlet ducts of the plurality of air supply sections are installed with an air valve 7, each air valve 7 is independently controlled to rotate, the air outlet flow rate of each air outlet duct can be balanced, and the opening size of the air valve 7 can also be adjusted to adapt to climate changes to achieve precise air supply, in addition, by adjusting the air valve 7, targeted air supply to individual positions can be achieved, thereby reducing energy consumption.

[0041] Furthermore, it includes a first air outlet pipe 5 and a second air outlet pipe 9, the air supply duct 2 includes a first air supply section 3 and a second air supply section 8, one end of the first air supply section 3 is detachably connected to the air inlet structure 1, and the other end is clamped with one end of the second air supply section 8, the first air outlet pipe 5 is arranged on the first air supply section 3, the second air outlet pipe 9 is arranged on the second air supply section 8, and the air supply sections are all equipped with air outlet pipes for separate air outlet.

[0042] Preferably, the air outlet pipes are spliced ​​by a step structure 10, and the joints are covered with canvas to reinforce and prevent air leakage. The step structure 10 allows the air outlet pipes to be connected end to end, and the overall length of the air supply duct 2 is adjusted to adapt to use in venues of different areas.

[0043] Preferably, it also includes a plurality of lifting rings 4, which are arranged above the two ends of the air outlet pipe. The overall lifting of the ventilation system is achieved through the lifting rings 4, and the transportation and installation are flexible and convenient.

[0044] As a better option, it also includes a sealing cover 11, which is set at the end of the air supply duct 2 to close one end of the air supply duct 2. The sealing cover 11 is used to close the air supply duct 2 to prevent airflow leakage. The sealing cover 11 is detachably connected to the air supply duct 2 and can be quickly assembled with the air supply duct 2.

[0045] Preferably, a reducer 51 is provided on the air outlet pipe, and the reducer 51 is arranged close to the outlet of the air outlet pipe. The diameter of the reducer 51 changes from large to small, so that the flow rate of the air outlet becomes higher, and the air can be delivered in a targeted manner, which can complete indoor ventilation and fixed-point air delivery to organisms, thereby expanding the versatility of the ventilation system in agriculture.

[0046] Among them, the air intake structure 1 includes an air intake hood 101, a fan 102 and a switching tube 103. The fan 102 is arranged in the air intake hood 101. One end of the switching tube 103 is connected to the fan 102, and the other end is connected to the air supply duct 2. The fan 102 supplies air from the outside to the air supply duct 2. After passing through the air supply duct 2, the air is discharged inwardly from each air outlet pipe. The switching tube 103 is used to detachably connect fans 102 of different specifications to meet the need of combining the ventilation system in venues with different requirements. The air intake hood 101 is used for drainage and filtration.

[0047] Furthermore, it also includes an environmental controller 13 and multiple air valve controllers 6. The air valve controllers 6 are arranged on the air outlet duct one by one. The multiple air valve controllers 6 are respectively connected to the environmental controller 13. The environmental controller 13 is used to control the air valve controller 6 according to the ambient temperature and humidity to adjust the opening size of the air valve 7. The temperature sensor and the humidity sensor are arranged on the outlet of the air outlet duct, which are used to detect the indoor temperature and humidity and feed back the detection results to the environmental controller 13 as a reference for adjusting the opening of the air valve 7 and the speed of the fan 102.

[0048] A ventilation method, implemented by an agricultural ventilation system, comprises the following steps:

[0049] S1. Splicing: Select a corresponding number of air supply segments and air inlet structures 1 according to the size of the site, and splice the air supply segments in sequence to form an air supply duct 2 and connect it to the air inlet structure 1;

[0050] S2. Hoisting: hoist the air supply duct and the air inlet structure 1 after splicing to the top of the site through the lifting ring 4 on the air supply section for hanging;

[0051] S3. Adjustment: Adjust the opening of the air valve 7 in sequence along the moving direction of the air flow in the air supply duct 2 until the air flow rates of the multiple air outlet ducts are the same;

[0052] S4. Locking: After the adjustment is completed, the position of the air valve 7 is locked to keep the air volume of multiple air outlet pipes stable.

[0053] The specific ventilation methods are as follows:

[0054] Different air supply sections, flexible connecting pipes 12 and fans 102 are selected according to the size and form of the site, and multiple air supply sections and flexible connecting pipes 12 are arranged as needed and assembled in sequence into an air supply duct 2, and the fan 102 is installed on the air supply duct 2, and the hanging ropes are installed on each hanging ring 4, and the entire ventilation system is hoisted to the top and fixed together, and the air valve controller 6 is connected through the environmental controller 13 to rotate the air valve 7 to the initial position, and the control system adjusts the opening size of each air valve 7 to make the air output of each air valve 7 consistent, and the opening of the air valve 7 can also be adjusted separately to achieve targeted and precise air supply.

[0055] See also Figure 3 The control system of the ventilation system is composed of an environmental controller 13, a temperature sensor, a humidity sensor, an alarm device, a fan 102 and a plurality of air valves 7. The environmental controller 13 is respectively connected to the temperature sensor, the humidity sensor, the alarm device and the fan, and can receive temperature and humidity data and control the alarm device to issue a warning. The environmental controller 13 communicates with the fan 102 through the RS485 bus, obtains the operating status parameters fed back by the fan 102, such as current, voltage and speed, and adjusts the speed of the fan 102 in real time to achieve precise air supply.

[0056] Among them, the environmental controller 13 adopts the environmental controller FTC03 of Panshida Agricultural and Animal Husbandry Fan Company, which can provide precise ventilation for farms and planting fields. The environmental controller 13 has analog AD, digital communication port RS485, current acquisition, voltage acquisition, speed acquisition and other interfaces, which can realize an intelligent control solution integrating monitoring and control. The analog ADC module or communication module in the environmental controller 13 reads the temperature value, humidity value, fan power value, voltage value, current value, and speed value; after obtaining the value and saving it, the value type includes per-unit value, floating point value, integer value, etc.

[0057] Fan 102 is an infinitely variable speed fan, which can arbitrarily adjust the air volume of fan 102 within the working range. The speed changes smoothly and the speed regulation signal is accurate to ensure the stability of the ventilation volume. It can provide real-time feedback on the fan's speed, current, voltage, power, fan fault code and other information. This information can be uploaded to the environmental controller 13 via RS485, and the environmental controller 13 can monitor the air supply status and control the fan in real time.

[0058] See also Figure 4 The steps of adjusting the air volume of the fan and the opening of the air valve include:

[0059] Step S3.1, extracting the target air volume: fitting the air volume required for the current temperature according to the temperature-air volume value table input by the user and the temperature value collected by the current temperature sensor;

[0060] Step 3.2, inputting the working parameters of the fan 102: the working parameters include air volume, pressure, power and speed characteristics and the control target value of temperature-air volume;

[0061] Step 3.3, extracting the target air volume: the environmental controller 13 processes the input information, extracts the target air volume or calculates the target air volume to be output according to an equivalent transformation;

[0062] The equivalent transformation calculation is as follows: according to the fan air volume (Q)-pressure (Pa)-power (P)-voltage (U)-speed (n) characteristic parameter table input by the user and the temperature value (T1), humidity value (H1), fan power value (P1), voltage value (U1), current value (I1), and speed value (n1) read from the current ADC module or communication module by the environment controller 13, the changes are made;

[0063] Let k1=n1 / n, the transformed air volume q is equal to Q multiplied by a certain number of k1, the transformed pressure pa is equal to Pa multiplied by a certain number of k1, the transformed power p is equal to P multiplied by a certain number of k1, and the transformed speed n2=n1, and a new characteristic parameter table is obtained; let y1=K*T1, y2=K1*H1, where K and K1 are coefficients; the transformed fan power P2 is equal to P1 multiplied by a certain number of y1 multiplied by a certain number of y2; in the new characteristic parameter table, look up the table to find the point that fits the transformed fan power value (P2), the current voltage value (U1), and the current speed value (n1), locate the point and find the air volume Q1 of the point in the new characteristic parameter table; then the current output air volume Q2=Q1.

[0064] Step 3.4, control output: the environmental controller 13 adjusts the speed of the fan 102 by PID mode and the fan 102 feeds back the speed signal for monitoring; the environmental controller 13 collects the power, current, voltage and speed fan parameters of the fan 102 in real time; the environmental controller calculates the air volume corresponding to the current power, speed, humidity, temperature and the input fan performance; when the calculated air volume is less than the given air volume, the fan speed is increased; when the calculated air volume q is greater than the given air volume Q, the fan 102 speed is reduced until the calculated air volume q is equal to the given air volume Q; when the calculated air volume q is equal to the given air volume Q, the speed regulation signal of the fan 102 is locked; when the speed of the fan 102 is very low or very high or is not controlled by the alarm signal issued by the control, the fan 102 is turned off; when the power is detected to be too high (the current is large) or the power is detected to be too low (the current is small), a warning signal is issued to turn off the fan 102; when the alarm signal is cleared, the fan 102 is restored to prevent damage to the fan 102.

[0065] Embodiment 2

[0066] like Figure 5 As shown, this embodiment also discloses an agricultural ventilation system, and the same features as those in the first embodiment are not repeated here, but the difference is that the agricultural ventilation system also includes a flexible connecting pipe 12, and the flexible connecting pipe 12 is detachably arranged on the air supply duct 2, so that the air supply duct 2 can be installed at a bend, which is suitable for installation and use in sites of different areas, thereby improving the flexibility and versatility of the installation of the agricultural system.

[0067] Embodiment 3

[0068] like Figure 6 As shown, the present embodiment also discloses an agricultural ventilation system, in which the diameters of a plurality of air outlet pipes are successively reduced along the air flow moving direction of the air supply duct 2, and the outlets of the air outlet pipes become smaller, so that the flow rate of the air outlet is the same, thereby achieving a stable ventilation effect, and the outlet directions of each air outlet pipe may remain unchanged, and the effect of targeted ventilation can be achieved by controlling the air volume, wind speed and air inlet position, and the system can be used in the breeding industry.

[0069] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also change and modify the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. An agricultural ventilation system for implementing a ventilation method, characterized in that: The ventilation method comprises the following steps: S1. Splicing: Select a corresponding number of air supply sections and air inlet structures (1) according to the size of the site, and sequentially splice the air supply sections to form an air supply duct (2) and connect it to the air inlet structure (1); S2. Hoisting: hoisting the air supply duct (2) and the air inlet structure (1) after splicing to the top of the site through the hoisting ring (4) on the air supply section; S3. Adjustment: sequentially adjusting the opening of the air valve (7) in the outlet of the air supply section along the moving direction of the air flow in the air supply duct (2) until the air flow rates of the multiple air outlet pipes on the air supply duct (2) are the same; The step of adjusting the air volume of the fan (102) and the opening of the air valve (7) comprises: Step S3.1, extracting the target air volume: fitting the air volume required for the current temperature according to the temperature-air volume value table input by the user and the temperature value collected by the current temperature sensor; Step 3.2, inputting the working parameters of the fan (102): the working parameters include air volume, pressure, power and speed characteristics and the control target value of temperature-air volume; Step 3.3, extracting the target air volume: processing the input information, extracting the target air volume or calculating the target air volume to be output according to the equivalent transformation; Step 3.4, control output: adjusting the rotation speed of the fan (102) by means of PID and having the fan (102) feed back a rotation speed signal for monitoring; S4. Locking: After the adjustment is completed, the position of the air valve (7) is locked to keep the air volume of the plurality of air outlet pipes stable; The agricultural ventilation system comprises an air inlet structure (1), an air supply duct (2) and a plurality of air outlet pipes, wherein the air inlet structure (1) is arranged at one end of the air supply duct (2), the plurality of air outlet pipes are arranged on the air supply duct (2), the air supply duct (2) comprises a plurality of air supply sections, the plurality of air supply sections are sequentially detachably connected, the plurality of air supply sections are connected to the plurality of air outlet pipes in a one-to-one correspondence, the plurality of air outlet pipes are provided with air valves (7), the air valves (7) control the opening of the air outlet pipes, and the opening of the air valves (7) gradually increases along the air flow direction of the air supply duct (2); It also comprises a flexible connecting pipe (12), wherein the flexible connecting pipe (12) is detachably arranged on the air supply duct (2) and is used for arranging the air supply duct (2) at a corner; The air outlet pipe is provided with a reducing pipe (51), and the reducing pipe (51) is arranged close to the outlet of the air outlet pipe; The air intake structure (1) comprises an air intake cover (101), a fan (102) and a transfer pipe (103); the fan (102) is arranged in the air intake cover (101); one end of the transfer pipe (103) is connected to the fan (102), and the other end is connected to the air supply duct (2); It also includes an environment controller (13) and a plurality of air valve controllers (6), wherein the air valve controllers (6) are arranged on the air outlet pipe in a one-to-one correspondence, and the plurality of air valve controllers (6) are respectively connected to the environment controller (13), and the environment controller (13) is used to control the air valve controller (6) according to the ambient temperature and humidity to adjust the opening size of the air valve (7); The environmental controller (13) adjusts the speed of the fan (102) by means of PID and the fan (102) feeds back a speed signal for monitoring; the environmental controller (13) collects the power, current, voltage and speed fan parameters of the fan (102) in real time; the environmental controller calculates the air volume corresponding to the current power, speed, humidity, temperature and input fan performance; when the calculated air volume is less than a given air volume, the fan speed is increased; when the calculated air volume q is greater than a given air volume Q, the fan (102) is reduced. The speed is increased until the calculated air volume q is equal to the given air volume Q; when the calculated air volume q is equal to the given air volume Q, the speed regulation signal of the fan (102) is locked; when the speed of the fan (102) is very low or very high or is not controlled by the alarm signal issued by the control, the fan (102) is turned off; when the power is detected to be too high and the current is too high or the power is detected to be too low and the current is too low, a warning signal is issued to turn off the fan (102); when the alarm signal is cleared, the operation of the fan (102) is restored to prevent damage to the fan (102).

2. The agricultural ventilation system according to claim 1, characterized in that: The hanging rings (4) are arranged above the two ends of the air outlet pipe.

3. The agricultural ventilation system according to claim 1, characterized in that: It also comprises a sealing cover (11), wherein the sealing cover (11) is arranged at the end of the air supply duct (2) to seal one end of the air supply duct (2).

4. The agricultural ventilation system according to any one of claims 1 to 3, characterized in that: Along the air flow direction of the air supply duct (2), the diameters of the plurality of air outlet pipes decrease sequentially.

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