Ventilator temperature and humidity automatic control system

Abstract

An automatic temperature and humidity control system for a ventilating fan comprises a ventilating fan motor, a humidity probe, a thermistor assembly, a control circuit board, a power interface, an external control switch interface and an external control switch, and the ventilating fan is controlled through the functions of humidity control starting, delayed closing, external switch control starting, delayed starting and interval circulation. The method specifically comprises the steps that S1, humidity control starting and delayed closing functions are achieved, when power interfaces L and N are connected and an external control switch interface LS is disconnected, a ventilator monitors indoor humidity through a humidity probe, and when the indoor humidity reaches the set humidity value plus 3% RH, the ventilator is started; and when the indoor humidity is lower than the set humidity value minus 3% RH, the ventilator enters a delay closing program, and therefore efficient management of the space air quality is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ventilation and air exchange, in particular to an automatic temperature and humidity control system for a ventilation fan. Background Art

[0002] In the current indoor environment control system, ventilation equipment is one of the important facilities to ensure air quality, especially in a humid environment, where ventilation equipment plays a vital role in indoor humidity control. However, traditional ventilation systems still have many shortcomings in terms of humidity control, energy saving and ease of use.

[0003] Most existing ventilation systems use a simple manual switch control method, and users need to judge whether to turn the ventilation fan on or off based on the indoor humidity. This manual control method is not only easy to ignore or delay the switching time, resulting in excessively high or low indoor humidity, affecting comfort and air quality, but may also cause energy waste due to forgetting to turn it off. In addition, although some ventilation systems have added automatic humidity sensing functions, they are difficult to adapt to complex indoor environmental requirements due to the lack of flexible control modes. For example, during the rainy season or in coastal areas, the indoor humidity changes dramatically, and it is difficult for existing ventilation systems to achieve effective humidity control, which often causes the ventilation fan to run continuously for a long time, increasing energy consumption.

[0004] The control method of traditional ventilation systems usually only has a simple "start-off" mode, lacking a precise humidity control mechanism, resulting in inaccurate humidity control. For example, when the indoor humidity reaches the preset threshold, the ventilation fan will automatically turn on, but it cannot be adjusted in time according to the slight changes in humidity. It may turn on frequently when the humidity is high, resulting in unnecessary energy consumption. In addition, the existing technology generally lacks functions such as delayed shutdown, delayed start, and interval cycle, making it difficult for users to obtain the best user experience in some special usage scenarios. For example, in the case of a short stay (such as a restroom), turning on the ventilation fan may cause a waste of resources, and the lack of interval cycle function also makes the device unable to operate efficiently in extreme humidity environments.

[0005] In general, the existing technology has the following defects: 1. Lack of automatic control function: Most existing ventilation systems are manually controlled or simply automatically switched on and off, and cannot achieve accurate automatic control according to changes in indoor humidity. Users need to frequently operate manually, which is inconvenient to use and there is a risk of missed closing or misoperation.

[0006] 2. Lack of delayed shutdown and delayed start functions: Traditional systems are not equipped with delayed shutdown or delayed start functions, which causes the ventilation fan to stop immediately after a short period of use, making it impossible to ventilate the room adequately, or causing energy waste due to short-term operation. In addition, the lack of delayed start function causes the device to start when the user briefly enters the space, increasing unnecessary energy consumption.

[0007] 3. Lack of interval cycle mode: Under extreme humidity conditions (such as continuous moisture in a high humidity environment, or dryness in a low humidity environment), it is difficult for existing systems to provide interval cycle mode, resulting in the equipment running continuously for a long time, or frequent switching, which reduces the life of the equipment and brings energy waste.

[0008] 4. Low humidity control accuracy: The existing humidity sensing control system lacks fine adjustment of the humidity threshold, usually only has a fixed switch point, and cannot set different humidity control thresholds according to the needs of different environments. In addition, the traditional system does not implement delay control and multi-level humidity settings, which limits the humidity control range and cannot meet the needs of multiple scenarios. Therefore, it is necessary to make further improvements. Summary of the invention

[0009] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a ventilation fan temperature and humidity automatic control system with a simple structure, convenient and quick operation, and a multifunctional humidity control ventilation system with automatic humidity control, delayed shutdown, delayed start, external switch linkage, interval circulation, etc.

[0010] The object of the present invention is achieved in the following manner: an automatic temperature and humidity control system for a ventilation fan, the system comprising a ventilation fan motor, a humidity probe, a thermistor assembly, a control circuit board, a power interface, an external control switch interface, and an external control switch, and the control of the ventilation fan is achieved through humidity control start, delayed shutdown, external switch control start, delayed start and interval cycle functions, and the specific method includes: S1: Humidity control start and delayed shutdown function. When the power interfaces L and N are connected and the external control switch interface LS is disconnected, the ventilation fan monitors the indoor humidity through the humidity probe. When the indoor humidity reaches the set humidity value plus 3%RH, the ventilation fan starts; when the indoor humidity is lower than the set humidity value minus 3%RH, the ventilation fan enters the delayed shutdown program, and the delay time is set by the DIP switch; S2: External switch control start function, through the connection with the external switch K, generally control the lighting, when the K switch is turned on, the ventilation fan starts, and when the delayed start function switch is OFF, when the K switch is turned off, the ventilation fan enters the delayed shutdown program, and the delay time is set by the DIP switch; if the indoor humidity is higher than the set humidity value plus 3%RH, the ventilation fan will continue to work until the humidity is lower than the set humidity value minus 3%RH, then it will enter the delayed shutdown program, thereby achieving efficient management of the air quality of the space and avoiding energy waste caused by long-term operation; S3: Delayed start function, the delayed start program is controlled by the DIP switch. When the external switch K is turned on and kept for A seconds, the ventilation fan starts. If it is turned off within A seconds, it will not start to avoid energy waste caused by short-term stay. The premise is that the ambient humidity has not reached the set start level and the ventilation fan is in the OFF state. Users can choose whether to enable this function to meet the needs of different usage scenarios; S4: Interval cycle function, through the interval cycle program controlled by the DIP switch, in extremely high humidity or very dry environment, the ventilation fan is operated and stopped intermittently. Avoid the ventilation fan from working for a long time or not starting due to low humidity. The downtime can be controlled by the DIP switch.

[0011] Further: In S1, the set humidity value can be set by dip switches 4 and 5, including humidity setting gears of 60%, 70%, 80%, and 90%, and the delayed closing time is set by dip switches 6 and 7, which can be selected from 1 minute, 5 minutes, 15 minutes, or 30 minutes.

[0012] Further: in S1, in S4, the downtime can be controlled by the dial switch 1 to set the interval cycle function, and the dial switch 2 and 3 to set the downtime, which is 4 hours, 8 hours, 12 hours or 24 hours; when the interval cycle mode is started, the ventilation fan will stop for the set time after working for 1 hour and cycle again; when the external switch K is turned on, the ventilation fan starts immediately; after the external switch K is turned off, the ventilation fan resumes the interval cycle mode.

[0013] Furthermore: the control circuit board includes power supply interfaces L and N for receiving 220-240V AC power supply, the external control switch interface LS is connected in parallel with the power supply interface L, the external switch K is used to control the working state of the ventilation fan through the LS interface, and the K switch is connected in series with the lighting lamp to realize the linkage control of lighting and ventilation.

[0014] Further: In the above S3, the delayed start function is set to the on state through the DIP switch, and the ventilation fan will only start when the external switch K remains in the on state for A seconds.

[0015] Furthermore: the downtime of the interval cycle function can be set to 4 hours, 8 hours, 12 hours or 24 hours through the DIP switch. In the interval cycle mode, the ventilation fan will stop for a preset time after working for 1 hour.

[0016] Furthermore: the humidity probe is used to detect indoor humidity, and the thermistor is used for temperature compensation. The two are used together to make humidity detection more accurate.

[0017] Further: the dip switch includes eight switches for setting the humidity control threshold, delayed shutdown time, delayed start time and interval cycle downtime, wherein: - DIP switches 4 / 5 are used to set the humidity control threshold; - Dip switch 6 / 7 is used to set the delayed closing time; - Dip switch No. 8 is used to control delayed start; -DIP switches 1-3 are used to set the downtime of the interval cycle.

[0018] Furthermore: the value of A is 30-60 seconds.

[0019] The beneficial effects of the present invention are: 1. Simple structure, low production cost and improved market competitiveness.

[0020] 2. This system is equipped with a humidity probe that can automatically detect indoor humidity. When the humidity reaches the set value plus 3%RH, the ventilation fan is automatically started; when the humidity is lower than the set value minus 3%RH, the delayed shutdown program is entered. This design realizes the intelligent control of the ventilation fan, so that the ventilation fan automatically operates according to the actual humidity changes, which not only improves the comfort of the indoor environment, but also reduces the user's operating burden. At the same time, the delayed shutdown function ensures that ventilation continues for a period of time after the humidity is reduced, effectively discharges residual moisture, and ensures air quality.

[0021] 3. This system supports linkage control with external switches (such as restroom lighting switches). When the user turns on the lighting, the ventilation fan automatically starts; when the lighting is turned off, the ventilation fan enters the delayed shutdown program. This function is convenient for users' daily use and avoids energy waste caused by users forgetting to turn off the ventilation fan. At the same time, even in high humidity conditions, the ventilation fan will continue to run to ensure moisture discharge, which helps energy conservation and environmental protection.

[0022] 4. This system has a delayed start function, and the delayed start program can be controlled by the DIP switch. The ventilation fan will start only when the external switch K remains on for more than the set time (A seconds), avoiding energy waste caused by starting the ventilation fan in a short stay (such as when the user temporarily enters the toilet). This function is particularly suitable for public toilets or places with high frequency of use, which significantly improves energy utilization efficiency.

[0023] 5. This system is designed with an interval cycle function. Through the control of the dial switch, the ventilation fan can work intermittently in an environment with too high or too low humidity (such as the rainy season or a heating room), avoiding long-term continuous operation or no operation due to high humidity. The interval cycle mode will automatically shut down for a period of time (the time can be set to 4 hours, 8 hours, 12 hours or 24 hours) after working for 1 hour, and then cycle again, which can effectively adjust the air humidity, reduce energy consumption, and extend the service life of the equipment.

[0024] 6. The system provides multiple levels of humidity and delay time settings through the DIP switch. The humidity setting range includes 60%, 70%, 80%, and 90%. The delay off time can be set to 1 minute, 5 minutes, 15 minutes, or 30 minutes, and the downtime can also be set to different lengths. The flexible adjustment range allows the system to adapt to different scene requirements, whether it is at home, in the office, or in a humid environment, it can achieve the best humidity control effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The electrical schematic diagram of the present invention. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below with reference to the accompanying drawings. A ventilation fan temperature and humidity automatic control system, the system includes a ventilation fan motor, a humidity probe, a thermistor assembly, a control circuit board, a power interface, an external control switch interface, and an external control switch, and controls the ventilation fan through humidity control start, delayed shutdown, external switch control start, delayed start and interval cycle functions. The specific method includes: S1: Humidity control start and delayed shutdown function. When the power interfaces L and N are connected and the external control switch interface LS is disconnected, the ventilation fan monitors the indoor humidity through the humidity probe. When the indoor humidity reaches the set humidity value plus 3%RH, the ventilation fan starts; when the indoor humidity is lower than the set humidity value minus 3%RH, the ventilation fan enters the delayed shutdown program, and the delay time is set by the DIP switch; S2: External switch control start function, connected to the external switch K, when the K switch is turned on, the ventilation fan starts, when the K switch is turned off, the ventilation fan enters the delayed shutdown program, and the delay time is set by the DIP switch; if the indoor humidity is higher than the set humidity value plus 3%RH, the ventilation fan will continue to work until the humidity is lower than the set humidity value minus 3%RH, then it will enter the delayed shutdown program, thereby achieving efficient management of the air quality of the space and avoiding energy waste caused by long-term operation; S3: Delayed start function, the delay start program is controlled by the DIP switch. When the external switch K is turned on and kept for A seconds, the ventilation fan starts. If it is turned off within A seconds, it will not start to avoid energy waste caused by short-term stay. Users can choose whether to enable this function to meet the needs of different usage scenarios; S4: Interval cycle function, an interval cycle program controlled by a dip switch, which makes the ventilation fan work and stop intermittently in an extreme humidity environment. The stop time can be controlled by the dip switch.

[0027] In one of the embodiments: In S1, the set humidity value can be set by dip switches 4 and 5, including humidity setting gears of 60%, 70%, 80%, and 90%, and the delayed closing time is set by dip switches 6 and 7, which can be selected from 1 minute, 5 minutes, 15 minutes, or 30 minutes.

[0028] In one of the embodiments: in S1, in S4, the downtime can be set to 4 hours, 8 hours, 12 hours or 24 hours by controlling the dial switches 1, 2, and 3; when the interval cycle mode is started, the ventilation fan stops for the set time after working for 1 hour and cycles again; when the external switch K is turned on, the ventilation fan starts immediately; after the external switch K is turned off, the ventilation fan resumes the interval cycle mode.

[0029] In one of the embodiments: the control circuit board includes power supply interfaces L and N for receiving 220-240V AC power supply, the external control switch interface LS is connected in parallel with the power supply interface L, the external switch K is used to control the working state of the ventilation fan through the LS interface, and the K switch is connected in series with the lighting lamp to realize the linkage control of lighting and ventilation.

[0030] In one of the embodiments: in S3, the delayed start function is set to an on state through the DIP switch, and the ventilation fan will only start when the external switch K remains in the on state for A seconds.

[0031] In one embodiment, the downtime of the interval cycle function can be set to 4 hours, 8 hours, 12 hours or 24 hours via a dial switch. In the interval cycle mode, the ventilation fan will stop for a preset time after working for 1 hour.

[0032] In one embodiment: the humidity probe is used to detect indoor humidity, and the thermistor is used for temperature compensation. The two are used together to make humidity detection more accurate.

[0033] In one embodiment: the dip switch includes eight switches for setting the humidity control threshold, delayed shutdown time, delayed start time and interval cycle down time, wherein: - DIP switches 4 / 5 are used to set the humidity control threshold; - Dip switch 6 / 7 is used to set the delayed closing time; - Dip switch No. 8 is used to control delayed start; -DIP switches 1-3 are used to set the downtime of the interval cycle.

[0034] In one embodiment, the value of A is 30-60 seconds.

[0035] Working principle: The ventilation fan temperature and humidity automatic control system of the present invention realizes intelligent control of the ventilation fan through components such as humidity probe, thermistor, control circuit board, external control switch and dip switch, including humidity control start, delayed shutdown, external switch control start, delayed start and interval cycle and other functions, so that the ventilation fan can automatically adapt to different environmental requirements and provide an efficient and energy-saving ventilation control solution.

[0036] Specifically: 1. Humidity control start and delayed shutdown function (S1), when the system power interface (L, N) is connected and the external control switch interface (LS) is disconnected, the humidity probe starts to monitor the indoor humidity in real time. When the indoor humidity reaches the set threshold (such as the set humidity value plus 3%RH), the system will automatically start the ventilation fan to dehumidify until the humidity drops below the set humidity value minus 3%RH, and enter the delayed shutdown program. The delay shutdown time can be set to 1 minute, 5 minutes, 15 minutes or 30 minutes through the DIP switch. This function enables the ventilation fan to automatically operate according to the actual changes in humidity, ensuring indoor air quality while avoiding frequent switching operations. This automated humidity control greatly improves the user's convenience and saves energy.

[0037] 2. External switch control start function (S2): This system is connected to an external switch K (such as the lighting switch in the bathroom) through an external control switch interface (LS). When the user enters the bathroom and turns on the lighting, the K switch triggers the ventilation fan to start to remove moisture simultaneously; when the user leaves and turns off the lighting, the K switch is disconnected and the ventilation fan enters the delayed shutdown program. If the indoor humidity is higher than the set value plus 3%RH, the ventilation fan will continue to run until the humidity is lower than the set value minus 3%RH before entering the delayed shutdown program. This function ensures that users can quickly remove moisture when using spaces such as the bathroom, and continue to ventilate for a period of time after leaving, avoiding energy waste caused by users forgetting to turn off the ventilation fan.

[0038] 3. Delayed start function (S3): The delayed start function can be controlled by a DIP switch. When the user turns on the external switch K (such as entering the restroom for a short stay), the ventilation fan will not start immediately. The ventilation fan will only start when the K switch remains on for a preset delay time (A seconds, such as 30-60 seconds, adjustable). If the K switch is turned off within A seconds, the ventilation fan will not start. This design can effectively avoid unnecessary startups caused by short stays and reduce energy consumption. It is very suitable for public spaces or places with frequent use.

[0039] 4. Interval cycle function (S4): In extreme humidity environments (such as the rainy season or dry winter), the system's interval cycle function can be enabled through the DIP switch. When the interval cycle mode is enabled, the system works according to the preset cycle: the ventilation fan will automatically stop for a period of time after running for 1 hour. The downtime can be set to 4 hours, 8 hours, 12 hours or 24 hours through DIP switches 1, 2, and 3. After a period of downtime, the system will start the ventilation fan again for 1 hour, and the cycle will continue. The interval cycle function effectively prevents the increase in energy consumption caused by the long-term continuous operation of the ventilation fan in extreme humidity environments, and ensures the effectiveness of air circulation and humidity regulation. In the interval cycle mode, if the user needs to ventilate immediately, just turn on the external switch K, and the ventilation fan will start immediately. Turn off the K switch to restore the interval cycle mode.

[0040] 5. Humidity and time multi-level adjustment function: The system supports multi-level humidity setting and delay setting functions. Users can select the humidity control threshold through DIP switches 4 and 5, set to 60%, 70%, 80% or 90% respectively, and adjust the delay shutdown time to 1 minute, 5 minutes, 15 minutes or 30 minutes through DIP switches 6 and 7. In addition, the interval cycle downtime can be set to 4 hours, 8 hours, 12 hours or 24 hours through DIP switches 1, 2, and 3. The multi-level adjustment setting enables this system to adapt to different environmental requirements, and users can flexibly adjust according to actual scenarios to ensure the best air quality and energy saving effects.

[0041] To sum up, the ventilation fan temperature and humidity automatic control system of the present invention combines a variety of control modes and protection mechanisms. Through functions such as automatic humidity sensing, delayed shutdown, external switch linkage, delayed start, interval cycle and multi-gear adjustment, the system is made more intelligent and energy-saving, and meets the actual needs in multiple scenarios, greatly improving the user experience and the convenience of air quality management.

[0042] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A ventilation fan temperature and humidity automatic control system, characterized in that: The system includes a ventilation fan motor, a humidity probe, a thermistor assembly, a control circuit board, a power interface, an external control switch interface, and an external control switch. The ventilation fan is controlled through humidity control start, delayed shutdown, external switch control start, delayed start and interval cycle functions. The specific methods include: S1: Humidity control start and delayed shutdown function. When the power interfaces L and N are connected and the external control switch interface LS is disconnected, the ventilation fan monitors the indoor humidity through the humidity probe. When the indoor humidity reaches the set humidity value plus 3%RH, the ventilation fan starts; when the indoor humidity is lower than the set humidity value minus 3%RH, the ventilation fan enters the delayed shutdown program, and the delay time is set by the DIP switch; S2: External switch control start function, connected to the external switch K, when the K switch is turned on, the ventilation fan starts, when the K switch is turned off, the ventilation fan enters the delayed shutdown program, and the delay time is set by the DIP switch; if the indoor humidity is higher than the set humidity value plus 3%RH, the ventilation fan will continue to work until the humidity is lower than the set humidity value minus 3%RH, then it will enter the delayed shutdown program, thereby achieving efficient management of the air quality of the space and avoiding energy waste caused by long-term operation; S3: Delayed start function, the delay start program is controlled by the DIP switch. When the external switch K is turned on and kept for A seconds, the ventilation fan starts. If it is turned off within A seconds, it will not start to avoid energy waste caused by short-term stay. Users can choose whether to enable this function to meet the needs of different usage scenarios; S4: Interval cycle function, an interval cycle program controlled by a dip switch, which makes the ventilation fan work and stop intermittently in an extreme humidity environment. The stop time can be controlled by the dip switch.

2. The automatic temperature and humidity control system for a ventilation fan according to claim 1, characterized in that: In S1, the set humidity value can be set by dip switches 4 and 5, including 60%, 70%, 80%, and 90% humidity setting gears, and the delayed closing time is set by dip switches 6 and 7, which can be selected from 1 minute, 5 minutes, 15 minutes, or 30 minutes.

3. The automatic temperature and humidity control system for a ventilation fan according to claim 1, characterized in that: In S1, in S4, the downtime can be set to 4 hours, 8 hours, 12 hours or 24 hours by controlling the dial switches 1, 2, and 3; when the interval cycle mode is started, the ventilation fan stops for the set time after working for 1 hour and cycles again; when the external switch K is turned on, the ventilation fan starts immediately; after the external switch K is turned off, the ventilation fan resumes the interval cycle mode.

4. The control system of the humidity control ventilating fan according to claim 1, characterized in that: The control circuit board includes power supply interfaces L and N for receiving 220-240V AC power supply. The external control switch interface LS is connected in parallel with the power supply interfaces L and N. The external switch K is used to control the working state of the ventilation fan through the LS interface. The K switch is connected in series with the lighting lamp to realize the linkage control of lighting and ventilation.

5. The control system of the humidity control ventilating fan according to claim 1, characterized in that: In the above-mentioned S3, the delayed start function is set to the on state through the DIP switch, and the ventilation fan will start only when the external switch K remains in the on state for A seconds.

6. The control system of the humidity control ventilating fan according to claim 1, characterized in that: The downtime of the interval cycle function can be set to 4 hours, 8 hours, 12 hours or 24 hours via a dial switch. In the interval cycle mode, the ventilation fan will stop for a preset time after working for 1 hour.

7. The control system of the humidity control ventilating fan according to claim 1, characterized in that: The humidity probe is used to detect indoor humidity, and the thermistor is used to monitor the working state of the ventilator motor M, and is connected to the ventilator motor M through a control circuit to achieve automatic control and protection functions, avoid overload operation, and extend the life of the equipment.

8. The control system of the humidity control ventilating fan according to claim 1, characterized in that: The DIP switch includes eight switches for setting the humidity control threshold, delayed shutdown time, delayed start time and interval cycle down time, where: DIP switches 4 / 5 are used to set the humidity control threshold; DIP switch 6 / 7 is used to set the delayed closing time; DIP switch No. 8 is used to control delayed start; DIP switches 1-3 are used to set the downtime of the interval cycle.

9. The control system of the humidity control ventilating fan according to claim 1 or 5, characterized in that: The value of A is 30-60 seconds.

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