Positive pressure fan control method and system for animal husbandry

Abstract

The invention discloses a positive pressure fan control method and system for animal husbandry. The method comprises the steps that the priorities of two fan control factors including the temperature in a house and the pressure intensity in the house are judged; when the priority of the temperature in the house is higher than that of the pressure intensity in the house, a positive pressure fan controller controls the rotating speed of a positive pressure speed regulation fan based on the relation between the current temperature in the house and the minimum temperature, the target temperature and the full-speed temperature; and when the priority of the in-house pressure intensity is higher than the priority of the in-house temperature, the positive pressure fan controller controls the rotating speed of the positive pressure speed regulation fan based on the relation between the current in-house pressure intensity and the target pressure intensity. The system has the advantages of being low in cost and high in development degree, stable airflow can be generated, abrasion can be reduced, the service life can be prolonged, the maintenance cost can be reduced, the stability of the temperature and pressure in the house can be kept, and a suitable breeding environment can be provided.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to a control method and system of a positive pressure fan for animal husbandry. Background Art

[0002] With the rapid development of modern pig farming, the scale of pig farming has also expanded rapidly. It is difficult to raise pigs only by manpower, so intelligent auxiliary pig farming equipment came into being. The factor that has the greatest impact on centralized pig farming is the environment of the pig house. In summer, the temperature in the pig house is too high. In order to maintain the pig house at an appropriate temperature, the fan must be turned on. The negative pressure fans installed in the pig house are generally controlled by environmental controllers.

[0003] In the process of implementing the technical method of the embodiment of the present invention, the inventor of this patent found at least the following technical problems in the prior art: The resources of the environmental controller are limited. Controlling only by the sensor data on the environmental controller cannot meet the growing control needs, which may limit the function implementation and cannot meet the needs of some complex applications; the environmental controller requires more hardware and is more expensive; the environmental controller is not open and cannot be used with other equipment; when the negative pressure fan is working, the indoor air pressure will drop, which may cause poor indoor air flow and affect the indoor air quality; currently, the negative pressure fan can only operate at a preset speed and cannot flexibly adjust the speed according to the current environment.

[0004] In summary, the existing fan control method cannot meet the actual use requirements. Summary of the invention

[0005] The embodiments of the present invention provide a positive pressure fan control method and system for livestock, which solves the problem that the existing fan control method cannot meet the actual use requirements.

[0006] An embodiment of the present invention provides a method for controlling a positive pressure fan for livestock, comprising: Determine the priority of the two fan control factors, indoor temperature and indoor pressure; When the priority of the indoor temperature is higher than the priority of the indoor pressure, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full speed temperature; When the priority of the indoor pressure is higher than the priority of the indoor temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan based on the relationship between the current indoor pressure and the target pressure.

[0007] Optionally, based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full-speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan, specifically: If the temperature in the current house is lower than the minimum temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan to the minimum speed.

[0008] Optionally, based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full-speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan, specifically: If the temperature in the current house is between the minimum temperature and the target temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan to a transition speed.

[0009] Optionally, the transition speed is specifically a speed increased by 10% based on the minimum speed.

[0010] Optionally, based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full-speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan, specifically: If the current temperature in the house is between the target temperature and the full-speed temperature, the positive pressure fan controller controls the positive pressure speed regulating fan to adjust the speed in proportion to the difference between the current temperature in the house and the target temperature.

[0011] Optionally, the positive pressure fan controller controls the positive pressure speed regulating fan to adjust the speed in proportion to the difference between the current indoor temperature and the target temperature, specifically: Determine the temperature difference range between the target temperature and the full speed temperature; Divide the temperature difference range into three difference intervals; If the difference between the current room temperature and the target temperature is in the first difference interval, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan to 50% of the full speed; If the difference between the current room temperature and the target temperature is in the second difference interval, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan to 75% of the full speed; If the difference between the current indoor temperature and the target temperature is in the third difference interval, the positive pressure fan controller controls the rotation speed of the positive pressure speed regulating fan to 90% of the full speed.

[0012] Optionally, based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full-speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan, specifically: If the temperature in the current house is greater than or equal to the full-speed temperature, the positive-pressure fan controller controls the speed of the positive-pressure speed-regulating fan to the full-speed speed.

[0013] Optionally, based on the relationship between the current pressure in the house and the target pressure, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan, specifically: If the pressure in the current building is greater than the target pressure, the positive pressure fan controller controls the positive pressure speed regulating fan to intelligently reduce speed.

[0014] Optionally, the positive pressure fan controller controls the positive pressure speed regulating fan to intelligently reduce speed, specifically: According to the rate of change of the pressure in the house within a time period, the positive pressure fan controller controls the positive pressure speed regulating fan to reduce the speed proportionally.

[0015] On the other hand, an embodiment of the present invention further provides a positive pressure fan control system for animal husbandry, comprising: Positive pressure speed regulating fan; A judgment unit, used to judge the priorities of two fan control factors, namely, the temperature in the house and the pressure in the house; The positive pressure fan controller, when the priority of the indoor temperature is higher than the priority of the indoor pressure, controls the speed of the positive pressure speed-regulating fan based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full-speed temperature; when the priority of the indoor pressure is higher than the priority of the indoor temperature, controls the speed of the positive pressure speed-regulating fan based on the relationship between the current indoor pressure and the target pressure.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: The present invention adopts a positive pressure fan controller instead of an environmental control instrument to control the fan. The positive pressure fan controller based on single-chip microcomputer chip control can save more hardware on the PCB board, and one positive pressure fan controller can control five positive pressure speed-regulating fans at the same time, which has the advantages of low cost and high developability. The present invention adopts a positive pressure speed-regulating fan instead of a negative pressure fan, which can not only generate a stable airflow and maintain pressure balance in the indoor environment, which is beneficial to maintaining the air quality in the house, but also, compared with the negative pressure fan, the positive pressure speed-regulating fan does not need to be turned on so frequently, which can reduce wear, extend service life, and reduce maintenance costs. The present invention can intelligently adjust the rotation speed of the positive pressure speed-regulating fan according to the temperature and pressure in the house, can maintain the stability of the temperature and pressure in the house, and provide a suitable breeding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a flowchart of a method for controlling a positive pressure fan for livestock in one embodiment of the present invention. DETAILED DESCRIPTION

[0018] The embodiments of the present invention provide a positive pressure fan control method and system for livestock, which solves the problem that the existing fan control method cannot meet the actual use requirements.

[0019] In order to better understand the above-mentioned livestock positive pressure fan control method and system, the following will be described in detail in conjunction with the drawings and specific implementation methods of the specification. Obviously, the embodiments described in the present invention are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0020] Please refer to the following Figure 1 , a positive pressure fan control method for livestock in an embodiment of the present invention is described in detail.

[0021] Step 1: Determine the priority of the two fan control factors: indoor temperature and indoor pressure.

[0022] It should be noted that the priority of the fan control factor can be customized. In actual applications, the priority of the indoor temperature can be set to be higher than the priority of the indoor pressure, or the priority of the indoor pressure can be set to be higher than the priority of the indoor temperature. The present invention is not limited to this.

[0023] In the specific implementation process, for example, the user pre-sets the priority of indoor temperature and indoor pressure in the fan control factors according to actual use needs. The priority of indoor temperature can be higher than that of indoor pressure, and the priority of indoor pressure can be higher than that of indoor temperature. The system will control the fan speed according to the priority order of the fan control factors. Before executing the fan speed control, it is necessary to first determine the priority order of the fan control factors set by the user.

[0024] Step 2: When the priority of the indoor temperature is higher than the priority of the indoor pressure, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full speed temperature.

[0025] In the specific implementation process, for example, after the judgment step of step 1, a judgment result is generated. When the judgment result shows that the priority of the indoor temperature is higher than the priority of the indoor pressure, the current indoor temperature collected by the temperature sensor is obtained, and then the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full speed temperature is judged, and the positive pressure fan controller controls the speed of the positive pressure speed regulating fan in a targeted manner to make the current indoor temperature within an appropriate temperature range.

[0026] In step 2, based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full-speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed-regulating fan. Specifically, if the current indoor temperature is lower than the minimum temperature, the positive pressure fan controller controls the speed of the positive pressure speed-regulating fan to the minimum speed.

[0027] In the specific implementation process, for example: the minimum temperature is 13°C, if the current temperature in the house collected by the temperature sensor is 10°C, the positive pressure fan controller can judge that 10°C is lower than 13°C. At this time, if the speed of the positive pressure speed regulating fan is too high, the temperature of the pig house will be too low. The positive pressure fan controller needs to set the speed of the positive pressure speed regulating fan to the minimum speed to ensure the ventilation needs in the pig house.

[0028] In step 2, based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan, specifically: if the current indoor temperature is between the minimum temperature and the target temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan to the transition speed. Among them, the transition speed is specifically a speed increased by 10% on the basis of the minimum speed. In practical applications, the speed corresponding to the transition speed can be set according to actual needs, for example: the transition speed is a speed increased by 5% on the basis of the minimum speed, and the transition speed is a speed increased by 12% on the basis of the minimum speed, which is not limited by the present invention.

[0029] In the specific implementation process, for example: the minimum temperature is 13℃, the target temperature is 25℃, if the current temperature in the house collected by the temperature sensor is 20℃, the positive pressure fan controller can judge that 20℃ is within the temperature range of 13℃ and 25℃. At this time, the positive pressure fan controller needs to set the speed of the positive pressure speed-regulating fan to the transition speed to supply fresh air into the pig house.

[0030] In step 2, based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full-speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed-regulating fan. Specifically, if the current indoor temperature is between the target temperature and the full-speed temperature, the positive pressure fan controller controls the positive pressure speed-regulating fan to adjust the speed proportionally according to the difference between the current indoor temperature and the target temperature.

[0031] The positive pressure fan controller controls the positive pressure speed-regulating fan to adjust the speed proportionally according to the difference between the current indoor temperature and the target temperature, specifically: determine the temperature difference range between the target temperature and the full-speed temperature; divide the temperature difference range into three difference intervals; if the difference between the current indoor temperature and the target temperature is in the first difference interval, the positive pressure fan controller controls the speed of the positive pressure speed-regulating fan to 50% of the full speed; if the difference between the current indoor temperature and the target temperature is in the second difference interval, the positive pressure fan controller controls the speed of the positive pressure speed-regulating fan to 75% of the full speed; if the difference between the current indoor temperature and the target temperature is in the third difference interval, the positive pressure fan controller controls the speed of the positive pressure speed-regulating fan to 90% of the full speed.

[0032] It should be noted that in actual applications, different speed regulation ratios can be customized. For example, the speed of the positive pressure speed regulation fan can be set to 10%, 15%, 30%, 35%, 40%, 50%, 70%, 80% of the full speed, etc., which is not limited by the present invention.

[0033] In the specific implementation process, for example: the target temperature is 25℃, the full speed temperature is 40℃, if the current temperature in the house collected by the temperature sensor is 28℃, the positive pressure fan controller can judge that 28℃ is within the temperature range of 25℃ and 40℃. At this time, the positive pressure fan controller needs to proportionally adjust the speed of the positive pressure speed regulating fan to infuse fresh air into the pig house while lowering the temperature in the pig house. Specifically, the temperature difference range between the target temperature of 25℃ and the full speed temperature of 40℃ is determined to be 0℃-15℃. The temperature difference range is divided into three difference intervals, namely 0℃-5℃, 5℃-10℃ and 10℃-15℃.

[0034] If the current temperature in the house is 28°C and the target temperature is 25°C, the difference between the current temperature in the house and the target temperature is 3°C, which is within the first difference range of 0°C-5°C. The positive pressure fan controller controls the speed of the positive pressure speed regulating fan to 50% of the full speed to slowly cool down the pig house.

[0035] If the current temperature in the house is 32°C and the target temperature is 25°C, the difference between the current temperature in the house and the target temperature is 7°C, which is within the second difference range of 5°C-10°C. The positive pressure fan controller controls the speed of the positive pressure speed regulating fan to 70% of the full speed to cool the pig house at a medium speed.

[0036] If the current temperature in the house is 39°C and the target temperature is 25°C, the difference between the current temperature in the house and the target temperature is 14°C, and 14°C is within the third difference interval of 10°C-15°C. The positive pressure fan controller controls the speed of the positive pressure speed regulating fan to 90% of the full speed to quickly cool down the pig house.

[0037] In step 2, based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full-speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed-regulating fan. Specifically, if the current indoor temperature is greater than or equal to the full-speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed-regulating fan to the full-speed speed.

[0038] In the specific implementation process, for example: the full-speed temperature is 40°C, if the current temperature in the house collected by the temperature sensor is 42°C, the positive pressure fan controller can judge that 42°C is greater than 40°C. At this time, the positive pressure fan controller needs to set the speed of the positive pressure speed regulating fan to full speed to cool down the pig house at full speed.

[0039] Step 3: When the priority of the indoor pressure is higher than the priority of the indoor temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan based on the relationship between the current indoor pressure and the target pressure.

[0040] In step 3, based on the relationship between the current pressure in the house and the target pressure, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan. Specifically, if the current pressure in the house is greater than the target pressure, the positive pressure fan controller controls the positive pressure speed regulating fan to intelligently reduce its speed.

[0041] The positive pressure fan controller controls the positive pressure speed regulating fan to intelligently reduce speed, specifically: according to the rate of change of the pressure in the house within a time period, the positive pressure fan controller controls the positive pressure speed regulating fan to reduce speed proportionally. Specifically, the time period is set to 2 minutes. In practical applications, the time period can be set according to actual needs, for example: the time period is 1 minute, 3 minutes or 4 minutes, which is not limited by the present invention.

[0042] In the specific implementation process, for example, turning on the positive pressure fan will increase the pressure in the house, and after the judgment step of step 1, a judgment result is generated. When the judgment result shows that the priority of the pressure in the house is higher than the priority of the temperature in the house, the current pressure in the house collected by the pressure sensor is obtained, and then the relationship between the current pressure in the house and the target pressure is judged. The positive pressure fan controller controls the speed of the positive pressure speed regulating fan, and then adjusts the pressure in the house to maintain a suitable pressure environment in the house. If the current pressure in the house is less than or equal to the target pressure, the positive pressure fan controller controls the positive pressure speed regulating fan to maintain the current speed; if the current pressure in the house is greater than the target pressure, according to the rate of change of the pressure in the house within the time period of 2 minutes, the positive pressure fan controller controls the positive pressure speed regulating fan to reduce the speed proportionally. Specifically, first obtain the pressure difference between the current pressure in the house and the pressure in the house at the previous time point, and then divide the pressure difference by the time period to calculate the pressure change rate; according to the relationship table between the pressure change rate and the speed reduction ratio, obtain the speed reduction ratio corresponding to the current pressure change rate; finally, the positive pressure fan controller controls the positive pressure speed regulating fan to reduce the corresponding speed reduction ratio based on the current speed.

[0043] The present invention also provides a positive pressure fan control system for animal husbandry, comprising: Positive pressure speed regulating fan; A judgment unit, used to judge the priorities of two fan control factors, namely, the temperature in the house and the pressure in the house; The positive pressure fan controller, when the priority of the indoor temperature is higher than the priority of the indoor pressure, controls the speed of the positive pressure speed-regulating fan based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full-speed temperature; when the priority of the indoor pressure is higher than the priority of the indoor temperature, controls the speed of the positive pressure speed-regulating fan based on the relationship between the current indoor pressure and the target pressure.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for controlling a positive pressure fan for livestock, characterized in that: include: Determine the priority of the two fan control factors, indoor temperature and indoor pressure; When the priority of the indoor temperature is higher than the priority of the indoor pressure, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full speed temperature; When the priority of the indoor pressure is higher than the priority of the indoor temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan based on the relationship between the current indoor pressure and the target pressure.

2. The method according to claim 1, characterized in that Based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan, specifically: If the temperature in the current house is lower than the minimum temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan to the minimum speed.

3. The method according to claim 1, characterized in that Based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan, specifically: If the temperature in the current house is between the minimum temperature and the target temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan to a transition speed.

4. The method according to claim 1, characterized in that The transition speed is specifically a speed that is increased by 10% based on the minimum speed.

5. The method according to claim 1, characterized in that Based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan, specifically: If the current temperature in the house is between the target temperature and the full-speed temperature, the positive pressure fan controller controls the positive pressure speed regulating fan to adjust the speed in proportion to the difference between the current temperature in the house and the target temperature.

6. The method according to claim 5, characterized in that The positive pressure fan controller controls the positive pressure speed regulating fan to adjust the speed in proportion to the difference between the current indoor temperature and the target temperature, specifically: Determine the temperature difference range between the target temperature and the full speed temperature; Divide the temperature difference range into three difference intervals; If the difference between the current room temperature and the target temperature is in the first difference interval, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan to 50% of the full speed; If the difference between the current room temperature and the target temperature is in the second difference interval, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan to 75% of the full speed; If the difference between the current indoor temperature and the target temperature is in the third difference interval, the positive pressure fan controller controls the rotation speed of the positive pressure speed regulating fan to 90% of the full speed.

7. The method according to claim 1, characterized in that Based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full speed temperature, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan, specifically: If the temperature in the current house is greater than or equal to the full-speed temperature, the positive-pressure fan controller controls the speed of the positive-pressure speed-regulating fan to the full-speed speed.

8. The method according to claim 1, characterized in that Based on the relationship between the current pressure in the house and the target pressure, the positive pressure fan controller controls the speed of the positive pressure speed regulating fan, specifically: If the pressure in the current building is greater than the target pressure, the positive pressure fan controller controls the positive pressure speed regulating fan to intelligently reduce speed.

9. The method according to claim 8, characterized in that The positive pressure fan controller controls the positive pressure speed regulating fan to intelligently reduce speed, specifically: According to the rate of change of the pressure in the house within a time period, the positive pressure fan controller controls the positive pressure speed regulating fan to reduce the speed proportionally.

10. A positive pressure fan control system for livestock, characterized in that: include: Positive pressure speed regulating fan; A judgment unit, used to judge the priorities of two fan control factors, namely, the temperature in the house and the pressure in the house; The positive pressure fan controller, when the priority of the indoor temperature is higher than the priority of the indoor pressure, controls the speed of the positive pressure speed-regulating fan based on the relationship between the current indoor temperature and the minimum temperature, the target temperature and the full-speed temperature; when the priority of the indoor pressure is higher than the priority of the indoor temperature, controls the speed of the positive pressure speed-regulating fan based on the relationship between the current indoor pressure and the target pressure.

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