A centralized ventilation method for building breeding

Abstract

The present invention relates to the technical field of livestock and poultry breeding, and specifically to a centralized ventilation method for building breeding. Different from the prior art, the average value of the real-time negative pressure values ​​measured by all negative pressure sensors is the real-time negative pressure value of the negative pressure ventilation shaft. If the real-time negative pressure value of the negative pressure ventilation shaft is defined as Ys, and the target negative pressure value of the negative pressure ventilation shaft is Ym, then: when Ys<Ym, the centralized control unit controls more fans to run and / or increases the speed of the fans through a frequency converter; when Ys=Ym, the number and speed of the current fans running are maintained; when Ys>Ym, the centralized control unit controls fewer fans to run and / or reduces the speed of the fans through a frequency converter. Compared with the prior art, the present invention overcomes the defects of the decentralized control of the prior art, and can centrally collect and process various sensor signals in the building, and adopt different target negative pressures according to different seasons to ensure that the minimum breathing volume of pigs can be maintained in winter and the maximum breathing volume in summer.

Description

Technical Field

[0001] The invention relates to the technical field of livestock and poultry breeding, in particular to a centralized ventilation method for breeding in buildings. Background Art

[0002] Currently, high-rise farming has become a mainstream trend in China, enabling rapid expansion of farming scale, increasing stock numbers, and thus boosting production capacity. However, the decentralized ventilation control strategies of the existing "flat-lay" farming model cannot be applied to high-rise farming. This is the current reason why high-rise farming has not been widely adopted and represents a technical issue that needs to be addressed urgently.

[0003] The applicant has disclosed a livestock breeding building with constant temperature and humidity under publication number CN215736284U. The key points of its technical solution are that it includes a breeding building, which has multiple breeding layers; a negative pressure ventilation shaft, which is arranged on one side of the breeding building; a ventilation valve, each breeding layer is connected to the negative pressure ventilation shaft and is provided with a ventilation valve; a ventilation valve controller; a temperature sensor, each breeding layer is provided with a temperature sensor; a humidity sensor, each breeding layer is provided with a humidity sensor; a fan group, which is arranged at the top of the negative pressure ventilation shaft; a frequency converter group, which is used to control the speed and opening number of the fan; and a centralized control unit; according to the signals detected by the temperature sensor and humidity sensor in each breeding layer, the speed, opening number and opening degree of the ventilation valve of the fan are controlled, thereby controlling the ventilation volume of each breeding layer, thereby realizing unified control of the temperature and humidity of each floor.

[0004] However, since the fan unit 3 provides negative pressure for the entire negative pressure ventilation shaft 2, if the centralized control unit 7 controls the speed of the fans in the fan unit 3 and the number of fans activated based on the negative pressure corresponding to a certain breeding layer 11, the system will crash. Furthermore, the above technical solution does not disclose how centralized ventilation is achieved throughout the entire building. Summary of the Invention

[0005] In order to improve the ventilation scheme of the building farming model, the present invention discloses a centralized ventilation method for building farming, and the technical solution adopted is:

[0006] A centralized ventilation method for aquaculture in a building comprises: a sliding curtain and a sliding curtain controller for controlling the opening of the sliding curtain are arranged above the intersection of each aquaculture layer and a negative pressure ventilation shaft; a first temperature sensor and a humidity sensor are installed near the sliding curtain, and a second temperature sensor is installed away from the sliding curtain; a negative pressure sensor is installed in the negative pressure ventilation shaft corresponding to each aquaculture layer, and each negative pressure sensor detects the real-time negative pressure value of the corresponding aquaculture layer, characterized in that the average value of the real-time negative pressure values ​​measured by all negative pressure sensors is the real-time negative pressure value of the negative pressure ventilation shaft; if the real-time negative pressure value of the negative pressure ventilation shaft is defined as Ys, and the target negative pressure value of the negative pressure ventilation shaft is defined as Ym, then: when Ys<Ym, the centralized control unit controls more fans to run and / or increases the speed of the fans through the frequency converter; when Ys=Ym, the current number and speed of the running fans are maintained; when Ys>Ym, the centralized control unit controls fewer fans to run and / or reduces the speed of the fans through the frequency converter.

[0007] Furthermore, Ym is calculated by the following formula ①, formula ② or formula ③:

[0008] Ym=-X-20 ①

[0009] Ym=-0.02X2-0.4X-12 ②

[0010] Ym=0.02X2-1.6X-28 ③

[0011] Where X is the current outdoor temperature. Formula ① is applicable to spring and autumn, formula ② is applicable to winter, and formula ③ is applicable to summer.

[0012] Furthermore, when Ys<Ym, the centralized control unit preferentially increases the speed of the currently running fan through the frequency converter. When the speed of the currently running fan reaches 100% and is still in the state of Ys>Ym within the set time, the centralized control unit increases the number of running fans based on the number of currently running fans; when Ys>Ym, the centralized control unit preferentially reduces the speed of the currently running fan through the frequency converter. When the speed of the currently running fan drops to the minimum starting air volume and is still in the state of Ys>Ym within the set time, the centralized control unit reduces the number of running fans based on the number of currently running fans; the set time is 15min-30min.

[0013] Furthermore, if the opening of the sliding curtain is defined as K, the target temperature of the corresponding breeding layer is Td, the average of the temperatures detected by the first temperature sensor and the second temperature sensor is the real-time temperature value Ts of the corresponding breeding layer, the real-time humidity value Rh of the corresponding breeding layer detected by the humidity sensor is Rh, and the temperature difference parameter set by the user is Tc, then: when Ts-Td>Tc, execute formula 4; when 0<Ts-Td<Tc, execute formula 5; when Ts-Td<0, execute formula 6:

[0014] K=(0.1*(i++)*Tp+Rh*0.25) *100% ④

[0015] K=K ⑤

[0016] K=(0.1*(i--)*Tp+Rh*0.25)*100% ⑥;

[0017] Where, Tp is the pulse time base; i is the independent variable function, i++ means adding 1, i-- means subtracting 1, when i > 10, i = 10 is executed, and when K > 100, K = 100 is executed.

[0018] Compared with the existing technology, the present invention overcomes the defects of the existing technology's decentralized control. It can centrally collect and process various sensor signals in the building. At the same time, it adopts different target negative pressures according to different seasons to ensure that the pigs can maintain the minimum breathing volume in winter and the maximum breathing volume in summer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a temperature and negative pressure relationship diagram manifested by formula ①, formula ② and formula ③ of the present invention. DETAILED DESCRIPTION

[0020] A centralized ventilation method for aquaculture in a building comprises: a sliding curtain and a sliding curtain controller for controlling the opening of the sliding curtain are arranged above the intersection of each aquaculture layer and a negative pressure ventilation shaft; a first temperature sensor and a humidity sensor are installed near the sliding curtain, and a second temperature sensor is installed away from the sliding curtain; a negative pressure sensor is installed in the negative pressure ventilation shaft corresponding to each aquaculture layer, and each negative pressure sensor detects the real-time negative pressure value of the corresponding aquaculture layer, characterized in that the average value of the real-time negative pressure values ​​measured by all negative pressure sensors is the real-time negative pressure value of the negative pressure ventilation shaft; if the real-time negative pressure value of the negative pressure ventilation shaft is defined as Ys, and the target negative pressure value of the negative pressure ventilation shaft is defined as Ym, then: when Ys<Ym, the centralized control unit controls more fans to run and / or increases the speed of the fans through the frequency converter; when Ys=Ym, the current number and speed of the running fans are maintained; when Ys>Ym, the centralized control unit controls fewer fans to run and / or reduces the speed of the fans through the frequency converter.

[0021] Furthermore, Ym is calculated by the following formula ①, formula ② or formula ③:

[0022] Ym=-X-20 ①

[0023] Ym=-0.02X2-0.4X-12 ②

[0024] Ym=0.02X2-1.6X-28 ③

[0025] Where X is the current outdoor temperature. Formula ① is applicable to spring and autumn, formula ② is applicable to winter, and formula ③ is applicable to summer.

[0026] like Figure 1 As shown, in spring and autumn: the patio control negative pressure value and the outdoor weather temperature are in inverse proportional linear relationship. The higher the temperature, the lower the negative pressure, and the rate of change remains unchanged, and vice versa.

[0027] Winter: The negative pressure value of the patio control is in a positive parabolic linear relationship with the outdoor weather temperature. The higher the temperature, the faster the rate of change of the negative pressure. In the low temperature zone, it shows a low response trend, and in the high temperature zone, it shows a fast response trend.

[0028] Summer: The negative pressure value of the patio control is in a negative parabolic linear relationship with the outdoor weather temperature. The higher the temperature, the slower the rate of change of the negative pressure. In the low temperature zone, it shows a high response trend, and in the high temperature zone, it shows a low response trend.

[0029] The higher the negative pressure, the more fans will be automatically used, and the lower the negative pressure, the less fans will be used, thereby maintaining the target negative pressure value of the system and ensuring that the pigs can maintain the minimum breathing volume in winter and the maximum breathing volume in summer.

[0030] In another preferred embodiment, when Ys<Ym, the centralized control unit preferentially increases the speed of the currently running fan through the frequency converter. When the speed of the currently running fan reaches 100% and is still in Ys>Ym within the set time, the centralized control unit increases the number of running fans based on the number of currently running fans; when Ys>Ym, the centralized control unit preferentially reduces the speed of the currently running fan through the frequency converter. When the speed of the currently running fan drops to the minimum starting air volume and is still in Ys>Ym within the set time, the centralized control unit reduces the number of running fans based on the number of currently running fans; the set time is 15min-30min.

[0031] In another preferred embodiment, if the opening of the sliding curtain is defined as K, the target temperature of the corresponding breeding layer is Td, the average of the temperatures detected by the first temperature sensor and the second temperature sensor is the real-time temperature value Ts of the corresponding breeding layer, the real-time humidity value Rh of the corresponding breeding layer detected by the humidity sensor is Rh, and the temperature difference parameter set by the user is Tc, then: when Ts-Td>Tc, execute formula 4; when 0<Ts-Td<Tc, execute formula 5; when Ts-Td<0, execute formula 6:

[0032] K=(0.1*(i++)*Tp+Rh*0.25) *100% ④

[0033] K=K ⑤

[0034] K=(0.1*(i--)*Tp+Rh*0.25)*100% ⑥;

[0035] Where Tp is the pulse time base; i is the independent variable function, i++ means adding 1, i-- means subtracting 1, when i > 10, i = 10 is executed, when K > 100, K = 100 is executed. K = K means the current opening remains unchanged.

[0036] Any details not described in the present invention are prior art or common knowledge in the art.

Claims

1. A centralized ventilation method for building breeding, wherein a sliding curtain and a sliding curtain controller for controlling the opening of the sliding curtain are arranged above the junction of each breeding layer and the negative pressure ventilation shaft, a first temperature sensor and a humidity sensor are installed near the sliding curtain, and a second temperature sensor is installed away from the sliding curtain; a negative pressure sensor is installed in the negative pressure ventilation shaft corresponding to each breeding layer, and each negative pressure sensor detects the real-time negative pressure value of the corresponding breeding layer, characterized in that: The average value of the real-time negative pressure values ​​measured by all negative pressure sensors is the real-time negative pressure value of the negative pressure ventilation shaft. If the real-time negative pressure value of the negative pressure ventilation shaft is defined as Ys, and the target negative pressure value of the negative pressure ventilation shaft is Ym, then: when Ys>Ym, the centralized control unit controls more fans to run through the industrial computer and / or increases the speed of the fans through the frequency converter; when Ys=Ym, the current number and speed of fans in operation are maintained; when Ys<Ym, the centralized control unit controls fewer fans to run through the industrial computer and / or reduces the speed of the fans through the frequency converter; Ym is calculated by formula ①, formula ② or formula ③: Ym=-X-20 ① Ym=-0.02X 2 -0.4X-12 ② Ym=0.02X 2 -1.6X-28 ③ The X value in the formula is the current outdoor temperature; Formula ① is suitable for spring and autumn, formula ② is suitable for winter, and formula ③ is suitable for summer; If the opening of the sliding curtain is defined as K, the target temperature of the corresponding breeding layer is Td, the average of the temperatures detected by the first temperature sensor and the second temperature sensor is the real-time temperature value Ts of the corresponding breeding layer, the real-time humidity value Rh of the corresponding breeding layer detected by the humidity sensor, and the temperature difference parameter set by the user is Tc, then: when Ts-Td>Tc, execute formula ④; when 0<Ts-Td<Tc, execute formula ⑤; when Ts-Td<0, execute formula ⑥: K=(0.1*(i++)*Tp+Rh*0.25) *100% ④ K=K ⑤ K=(0.1*(i--)*Tp+Rh*0.25)*100% ⑥; Wherein, Tp is the pulse time base; i is the independent variable function, i++ means adding 1, i-- means subtracting 1, when i >10, i=10 is executed, and when K>100, K=100 is executed.

2. A centralized ventilation method for building farming according to claim 1, characterized in that: When Ys<Ym, the centralized control unit shall give priority to gradually increasing the speed of the currently running fan through the frequency converter. When the speed of the currently running fan reaches 100% and is still in the state of Ys>Ym within the set time, the centralized control unit shall increase the number of running fans on the basis of the number of currently running fans; when Ys>Ym, the centralized control unit shall give priority to gradually reducing the speed of the currently running fan through the frequency converter. When the speed of the currently running fan drops to the minimum starting air volume and is still in the state of Ys>Ym within the set time, the centralized control unit shall reduce the number of running fans on the basis of the number of currently running fans; the set time is 15min-30min.

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