A new fresh air unit automatic control type freeze-proof temperature control device

Abstract

This utility model relates to the field of fresh air device technology and discloses a self-controlled anti-freeze temperature control device for fresh air units, including a fresh air unit box with functional partitions on both sides inside the box. This utility model uses a fresh air temperature sensor and a secondary fresh air sensor to detect the fresh air temperature, and an exhaust air temperature sensor to measure the exhaust air temperature. A temperature controller controls the electric heater to turn on, ensuring that the average temperature of multiple sensors is higher than the anti-freeze threshold. This provides both anti-freeze protection and energy savings. When the temperature is too high, the temperature controller can control the exhaust fan and exhaust impeller to utilize sensible heat recovery for auxiliary pre-cooling, reducing the cooling load on the cooling coil. When the temperature is too low, the exhaust fan and exhaust impeller stop operating, avoiding unnecessary equipment operation. This allows the device to automatically adjust and control according to temperature changes, providing excellent anti-freeze protection and being energy-efficient and environmentally friendly, greatly reducing the waste of electrical and thermal energy.

Description

Technical Field

[0001] This utility model relates to the field of fresh air device technology, and in particular to a self-controlled anti-freeze temperature control device for fresh air units. Background Technology

[0002] Fresh air handling units are air conditioning devices used to filter, heat, and purify fresh outdoor air before delivering it indoors. They are widely used in various buildings such as office buildings, shopping malls, and hospitals, effectively improving indoor air quality and ensuring a comfortable indoor environment. In data centers, fresh air systems play a crucial role in ensuring air quality in the computer room, maintaining positive pressure, diluting harmful gases, and ensuring equipment safety. However, existing fresh air handling units have several drawbacks. In low-temperature environments such as winter, components such as heat exchangers and pipes inside the units are prone to freezing and cracking due to excessively low temperatures. This is because when the unit stops operating or operates under poor conditions, residual moisture inside will freeze due to low temperatures, expanding in volume and causing component damage. This not only affects the normal operation of the unit but may also lead to safety hazards such as water leaks, increasing maintenance costs and downtime. Therefore, protecting fresh air handling units from freezing and cracking is crucial.

[0003] In existing technologies, fresh air handling units often rely on continuously running electric heaters to maintain stable internal temperatures. Even when external temperatures are relatively stable or the unit load is low, the heating power cannot be flexibly adjusted according to actual needs, resulting in excessive energy consumption and relatively poor energy efficiency. The system cannot effectively adjust temperature control based on temperature and seasonal changes, leading to insufficient energy savings and continued reliance on energy-consuming methods such as electric heating, further reducing the overall system's energy-saving effect. In northern regions, data centers experience low outdoor temperatures in winter, and the cooling coils operate with chilled water year-round. However, due to a lack of effective anti-freezing measures, surface coolers in operating fresh air handling units frequently freeze and crack, sometimes even causing data center service interruptions due to significant water leakage, posing a significant threat to normal data center operations. Automated anti-freezing and temperature control capabilities are relatively insufficient. Therefore, we propose a self-controlled anti-freezing and temperature control device for fresh air handling units to address these issues. Utility Model Content

[0004] In response to the problems raised, this utility model provides a self-controlled anti-freeze temperature control device for fresh air handling units to solve the aforementioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A self-controlled anti-freeze temperature control device for fresh air handling units includes a fresh air handling unit box, wherein functional partitions are provided on both sides inside the fresh air handling unit box;

[0007] The interior of the fresh air handling unit box is equipped with an exhaust impeller located between two functional partitions. The interior of the fresh air handling unit box is divided into a temperature adjustment chamber and an exhaust air filtration chamber by the functional partitions. The inside of the temperature adjustment chamber is equipped with a fresh air temperature sensor and a blower connected to the outside of the box on both sides. The inside of the exhaust air filtration chamber is equipped with an exhaust fan and an exhaust air temperature sensor connected to the outside of the box on both sides. An electric heater, a fresh air secondary sensor and a cooling coil are arranged in sequence in the middle of the inner side of the temperature adjustment chamber. An exhaust air filtration plate is arranged in the middle of the exhaust air filtration chamber.

[0008] The exhaust impeller is connected to the temperature adjustment chamber and the air outlet filter chamber, and a temperature controller is provided on the outside of the fresh air unit box.

[0009] Preferably, the fresh air handling unit box has a fresh air temperature sensor and a supply fan for fresh air intake, and an exhaust fan and an exhaust air temperature sensor for exhaust air outlet. The temperature controller is a PLC remote controller, and the temperature controller is electrically connected to the exhaust impeller, the fresh air temperature sensor, the supply fan, the exhaust fan, the exhaust air temperature sensor, the electric heater, the fresh air secondary sensor, and the cooling coil.

[0010] Preferably, the fresh air temperature sensor includes an air supply valve port pipe, a switch valve body, and a first sensor. The air supply valve port pipe is installed inside the fresh air unit box and connects to the inside and outside of the temperature adjustment chamber. The switch valve body is fixedly installed on the outside of the air supply valve port pipe. The first sensor is installed at the port of the air supply valve port pipe near the temperature adjustment chamber. The switch valve body is an electrically controlled valve port. The temperature controller is electrically connected to the switch valve body and the first sensor.

[0011] Preferably, the exhaust impeller is installed in the middle of the fresh air handling unit box, the exhaust impeller blows air towards the exhaust temperature sensor, the supply fan is fixedly installed inside the fresh air handling unit box, the supply fan blows air into the fresh air handling unit box, and the exhaust fan blows air out of the fresh air handling unit box.

[0012] Preferably, the exhaust temperature sensor includes an exhaust valve port pipe and a second sensor. The second sensor is installed on the side of the exhaust valve port pipe near the exhaust filter chamber. The exhaust valve port pipe is connected to the outside of the fresh air unit box. The exhaust filter plate is located between the exhaust valve port pipe and the exhaust impeller. The second sensor is electrically connected to the temperature controller.

[0013] Preferably, the air outlet filter plate is a ventilation dust filter plate, and the top of the fresh air unit box is provided with a switch cover plate, which is located directly above the air outlet filter plate.

[0014] Preferably, the fresh air secondary sensor includes a third sensor and a fourth sensor, both of which are located between the electric heater and the cooling coil, and both of which are electrically connected to the temperature controller.

[0015] Preferably, the exterior of the fresh air handling unit is equipped with a wireless communication unit, which is electrically connected to the temperature controller.

[0016] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0017] 1. The self-controlled anti-freeze temperature control device of this fresh air handling unit has two functional partitions inside the unit box, which can divide the inside of the unit box into a temperature adjustment chamber and an exhaust air filtration chamber. The temperature adjustment chamber is supplied with fresh air from the outside by a fresh air temperature sensor and a blower on both sides. After the fresh air is cooled by the cooling coil, it is guided to the exhaust air filtration chamber. After being filtered by the exhaust air filter, it is discharged by the exhaust air temperature sensor, thus completing the cooling, filtration and discharge of fresh air. The cooling and exhaust of fresh air are stable and convenient to use.

[0018] 2. This fresh air handling unit features a self-controlled anti-freeze temperature control device. An electric heater is installed inside the temperature adjustment chamber. When the temperature measured by the fresh air temperature sensor and the secondary fresh air sensor is lower than the anti-freeze threshold, the cooling coil is stopped, the water inlet valve of the cooling coil is closed, and the temperature controller controls the exhaust fan and exhaust impeller to preheat the fresh air. If the average temperature is still lower than the anti-freeze threshold, the temperature controller activates the electric heater to ensure that the average temperature of multiple sensors is higher than the anti-freeze threshold. The electric heater is then stopped to prevent prolonged operation, which wastes energy and shortens its lifespan. It provides good overheat protection and automated temperature measurement, facilitating rapid opening and closing of the electric heater. While preventing freezing, it is also energy-efficient, significantly reducing the waste of electrical and thermal energy.

[0019] 3. This fresh air handling unit features a self-controlled anti-freeze temperature control device. Through fresh air temperature sensors and secondary fresh air sensors, when the temperature falls below the anti-freeze threshold, the cooling coil is stopped. The temperature controller controls the exhaust fan and exhaust impeller to preheat the fresh air. If the average temperature remains below the anti-freeze threshold, the temperature controller activates the electric heater. This ensures that the average temperature from multiple sensors is above the anti-freeze threshold, and then stops the electric heater, preventing prolonged operation that wastes energy and shortens its lifespan. It provides good overheat protection, facilitates automated temperature measurement, and is energy-efficient while preventing freezing, significantly reducing energy and heat waste. Attached Figure Description

[0020] Figure 1 This utility model provides a front view sectional perspective view of a self-controlled anti-freeze temperature control device for fresh air handling units;

[0021] Figure 2 This utility model provides a bottom-view perspective sectional view of a self-controlled anti-freeze temperature control device for a fresh air handling unit.

[0022] Figure 3 This utility model provides a top-view perspective sectional view of a self-controlled anti-freeze temperature control device for a fresh air handling unit.

[0023] Figure 4 This utility model provides a front view sectional view of a self-controlled anti-freeze temperature control device for a fresh air handling unit;

[0024] Figure 5 This utility model provides a side-view perspective view of a self-controlled anti-freeze temperature control device for a fresh air handling unit.

[0025] Figure 6 This is a flowchart illustrating the principle of this utility model.

[0026] In the diagram: 1. Fresh air handling unit box; 2. Functional partition plate; 3. Exhaust impeller; 4. Temperature adjustment chamber; 5. Exhaust air filter chamber; 6. Fresh air temperature sensor; 601. Supply air valve port pipe; 602. Switch valve body; 603. First sensor; 7. Supply fan; 8. Exhaust fan; 9. Exhaust air temperature sensor; 901. Exhaust air valve port pipe; 902. Second sensor; 10. Electric heater; 11. Fresh air secondary sensor; 111. Third sensor; 112. Fourth sensor; 12. Cooling coil; 13. Exhaust air filter plate; 131. Switch cover plate; 14. Temperature controller; 15. Wireless communication unit. Detailed Implementation

[0027] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0029] Please see Figures 1-6 A self-controlled anti-freeze temperature control device for fresh air handling units includes a fresh air handling unit box 1, and functional partitions 2 are provided on both sides inside the fresh air handling unit box 1.

[0030] The interior of the fresh air handling unit box 1 is equipped with an exhaust impeller 3 located between two functional partitions 2. The interior of the fresh air handling unit box 1 is divided into a temperature adjustment chamber 4 and an exhaust air filter chamber 5 by the functional partitions 2. The inside of the temperature adjustment chamber 4 is equipped with a fresh air temperature sensor 6 and a blower 7 connected to the outside of the box, respectively. The inside of the exhaust air filter chamber 5 is equipped with an exhaust fan 8 and an exhaust air temperature sensor 9 connected to the outside of the box, respectively. The inner middle of the temperature adjustment chamber 4 is equipped with an electric heater 10, a fresh air secondary sensor 11 and a cooling coil 12 in sequence. The middle of the exhaust air filter chamber 5 is equipped with an exhaust air filter plate 13.

[0031] Among them, the exhaust impeller 3 passes through the temperature adjustment chamber 4 and the air outlet filter chamber 5, and the temperature controller 14 is provided on the outside of the fresh air unit box 1.

[0032] The beneficial effects of this solution are as follows: The internal structure of the fresh air unit box 1 is divided into a temperature adjustment chamber 4 and an exhaust air filter chamber 5 by the functional partition plate 2. When fresh air enters the temperature adjustment chamber 4, the fresh air temperature sensor 6 and the fresh air secondary sensor 11 detect the fresh air temperature in sequence, and the exhaust air temperature sensor 9 measures the exhaust air temperature. When the temperature measured by the fresh air temperature sensor 6 and the fresh air secondary sensor 11 is lower than the antifreeze threshold, the cooling coil 12 is stopped. The temperature controller 14 controls the exhaust fan 8 and the exhaust impeller 3 to preheat the fresh air. If the average temperature value is still lower than the antifreeze threshold, the temperature controller 14 turns on the electric heater 10 to ensure that the average temperature of multiple sensors is higher than the antifreeze threshold. The electric heater 10 is then stopped to prevent it from running for a long time, wasting electricity and shortening its service life. It has a good anti-overheating effect and is energy-saving while preventing freezing.

[0033] When the exhaust air temperature is lower than the specified value of the fresh air temperature, the temperature controller 14 can control the exhaust fan 8 and the exhaust impeller 3 to blow air, using the principle of sensible heat recovery to pre-cool the fresh air, reducing the cooling load of the cooling coil 12, which has good energy efficiency. When the fresh air temperature is detected to be lower than the exhaust air temperature, the exhaust fan 8 and the exhaust impeller 3 stop running, avoiding unnecessary equipment operation, making the device easy to automatically adjust and control according to temperature changes, with excellent anti-freeze protection capability, and is relatively energy-saving and environmentally friendly, greatly reducing the waste of electrical and thermal energy.

[0034] Furthermore, the fresh air unit box 1 is equipped with a fresh air temperature sensor 6 and a blower 7 for fresh air intake, and a fresh air unit box 1 is equipped with an exhaust fan 8 and an exhaust temperature sensor 9 for exhaust air outlet. The temperature controller 14 is a PLC remote controller, and the temperature controller 14 is electrically connected to the exhaust impeller 3, the fresh air temperature sensor 6, the blower 7, the exhaust fan 8, the exhaust temperature sensor 9, the electric heater 10, the fresh air secondary sensor 11, and the cooling coil 12.

[0035] Specifically, the fresh air handling unit 1 receives fresh air through a fresh air temperature sensor 6 and a blower 7, and exhausts air through an exhaust fan 8 and an exhaust temperature sensor 9, facilitating a cycle of fresh air intake and filtration followed by exhaust. During the cooling and exhaust process, the fresh air temperature sensor 6, the exhaust temperature sensor 9, and the secondary fresh air sensor 11 measure and monitor temperature changes in real time. The temperature controller 14 is a PLC remote controller, enabling remote PLC control. It facilitates automated numerical calculation and control, and intelligently and automatically responds to and adjusts to temperature changes in real time, adjusting the internal components of the unit. This provides protection against freezing and cracking while significantly reducing energy consumption, resulting in excellent energy-saving and environmental protection effects, high safety, and ease of use.

[0036] Furthermore, the fresh air temperature sensor 6 includes an air supply valve port pipe 601, a switch valve body 602, and a first sensor 603. The air supply valve port pipe 601 is installed inside the fresh air unit box 1 and is connected to the inside and outside of the temperature adjustment chamber 4. The switch valve body 602 is fixedly installed on the outside of the air supply valve port pipe 601. The first sensor 603 is installed at the pipe opening of the air supply valve port pipe 601 near the temperature adjustment chamber 4. The switch valve body 602 is an electrically controlled valve port. The temperature controller 14 is electrically connected to the switch valve body 602 and the first sensor 603.

[0037] Specifically, the air supply valve port pipe 601 is installed and connected to the inside and outside of the fresh air unit box 1, so that fresh air can enter the temperature adjustment chamber 4 through the air supply valve port pipe 601. The switch valve body 602 can control the opening and closing of the air supply valve port pipe 601. The inner side of the air supply valve port pipe 601 is equipped with a first sensor 603, which can measure the temperature of the fresh air supplied into the box in the first time. The measurement is convenient and accurate. The fresh air temperature information monitored and measured by the first sensor 603 can be directly transmitted to the temperature controller 14, and the temperature controller 14 controls whether the switch valve body 602 is opened or closed, which is convenient for automated control.

[0038] Furthermore, the exhaust impeller 3 is installed in the middle of the fresh air unit box 1, and the exhaust impeller 3 blows air towards the exhaust temperature sensor 9. The supply fan 7 is fixedly installed inside the fresh air unit box 1, and the supply fan 7 blows air into the fresh air unit box 1. The exhaust fan 8 blows air out of the fresh air unit box 1.

[0039] Specifically, the exhaust impeller 3 is installed in the middle of the fresh air handling unit box 1, which can stably blow air towards the exhaust temperature sensor 9 and the cooling coil 12. The exhaust impeller 3 uses the principle of sensible heat recovery to transfer the cold air of the exhaust to the fresh air, pre-cooling the fresh air. The pre-cooled fresh air then enters the cooling coil 12, reducing the cooling load of the cooling coil 12, reducing the energy consumption of the chiller, and achieving energy-saving operation. The blower 7 blows air into the fresh air handling unit box 1, which can stably blow external fresh air into the box and assist in stabilizing the blowing. The exhaust fan 8 blows air to the outside of the fresh air handling unit box 1 to assist in pre-cooling blowing, which is convenient for energy-saving use and the blowing circulation is stable.

[0040] Furthermore, the exhaust temperature sensor 9 includes an exhaust valve port pipe 901 and a second sensor 902. The second sensor 902 is installed on the side of the exhaust valve port pipe 901 near the exhaust filter chamber 5. The exhaust valve port pipe 901 is connected to the outside of the fresh air unit box 1. The exhaust filter plate 13 is located between the exhaust valve port pipe 901 and the exhaust impeller 3. The second sensor 902 is electrically connected to the temperature controller 14.

[0041] Specifically, the temperature of the fresh air is measured by the fresh air temperature sensor 6, and then measured by the second sensor 902 when the fresh air is discharged from the box. Both the fresh air and the exhaust air have good measurement stability and accuracy, and the measurement standards are easy to meet. They are also easy to adjust the temperature control according to the temperature difference, and have good adaptability. The exhaust valve pipe 901 can perform the exhaust function. After the fresh air is cooled, it is filtered by the exhaust filter plate 13 and finally exhausted through the exhaust valve pipe 901. During the exhaust process, the second sensor 902 performs stable measurement, and has good adaptability.

[0042] Furthermore, the air outlet filter plate 13 is a ventilation and dust filter plate, and the top of the fresh air unit box 1 is provided with a switch cover 131, which is located directly above the air outlet filter plate 13.

[0043] Specifically, the exhaust filter plate 13 is a ventilation dust filter plate, which plays a role in dust filtration during exhaust. It can stabilize the ventilation process and play a good role in filtering and removing dust in the air. The setting of the switch cover 131 makes it easy to put on and take off the exhaust filter plate 13, and makes it easy to remove and clean the exhaust filter plate 13 in the future. It is convenient to use and operate, and easy to maintain in the future.

[0044] Furthermore, the fresh air secondary sensor 11 includes a third sensor 111 and a fourth sensor 112. Both the third sensor 111 and the fourth sensor 112 are located between the electric heater 10 and the cooling coil 12, and both the third sensor 111 and the fourth sensor 112 are electrically connected to the temperature controller 14.

[0045] Specifically, the third sensor 111 and the fourth sensor 112 both serve as temperature monitoring and measurement functions. After the fresh air is measured once by the fresh air temperature sensor 6, it is then measured a second time by the third sensor 111 and the fourth sensor 112 next to its cooling coil 12. The air outlet pipe 901 and the second sensor 902 perform two measurements respectively to prevent large temperature differences from affecting the normal operation of the device. The sensing measurement is relatively stable and accurate, and the practicality is excellent.

[0046] Furthermore, a wireless communication unit 15 is provided on the outside of the fresh air unit box 1, and the wireless communication unit 15 is electrically connected to the temperature controller 14.

[0047] Specifically, the fresh air unit box 1 is equipped with a wireless communication unit 15 on the outside. When the temperature controller 14 measures the temperature, the temperature change and its control parameters can be wirelessly transmitted to the external device by the wireless communication unit 15. The external device can also directly control the operation with the temperature controller 14 through the wireless communication unit 15. The remote parameter communication and control function is good and the practicality is excellent.

[0048] How to use and how to work this device:

[0049] By providing two functional partitions 2 inside the fresh air handling unit box 1, the interior of the fresh air handling unit box 1 can be divided into a temperature adjustment chamber 4 and an air outlet filter chamber 5. The two functional partitions 2 are separated by an exhaust impeller 3 that can blow air into the temperature adjustment chamber 4 and the air outlet filter chamber 5 simultaneously. Fresh air is introduced into the box from the outside by a fresh air temperature sensor 6 and a blower 7 on both sides of the temperature adjustment chamber 4. After the fresh air is cooled by the cooling coil 12, it is guided into the air outlet filter chamber 5. After being filtered by the air outlet filter plate 13, it is discharged by the exhaust temperature sensor 9, thus completing the cooling, filtration and discharge of fresh air.

[0050] When fresh air enters the temperature adjustment chamber 4, the fresh air temperature sensor 6 and the fresh air secondary sensor 11 detect the fresh air temperature in sequence. When the filtered air is discharged from the chamber, the exhaust air temperature sensor 9 measures the exhaust air temperature. The temperature adjustment chamber 4 is equipped with an electric heater 10. When the temperature measured by the fresh air temperature sensor 6 and the fresh air secondary sensor 11 is lower than the antifreeze threshold, the cooling coil 12 is stopped and the water inlet valve of the cooling coil 12 is closed. The temperature controller 14 controls the exhaust fan 8 and the exhaust impeller 3 to preheat the fresh air. If the average temperature value is still lower than the antifreeze threshold, the temperature controller 14 turns on the electric heater 10 to ensure that the average temperature of multiple sensors is higher than the antifreeze threshold. The electric heater 10 is then stopped to prevent it from running for a long time, wasting electricity and shortening its service life. It has a good anti-overheating effect and can automatically measure the temperature, which facilitates the rapid opening and closing of the electric heater 10. It is energy-saving while preventing freezing and greatly reduces the waste of electricity and heat.

[0051] Exhaust air temperature sensor 9 detects the exhaust air temperature, while fresh air temperature sensor 6 and fresh air secondary sensor 11 detect the fresh air temperature. When the exhaust air temperature is more than two degrees lower than the fresh air temperature, the temperature controller 14 can control the exhaust fan 8 and exhaust impeller 3 to provide auxiliary cooling. Utilizing the principle of sensible heat recovery, the cooling capacity of the exhaust air is transferred to the fresh air for pre-cooling. The pre-cooled fresh air then re-enters the cooling coil 12, reducing the cooling load on the cooling coil 12, lowering the chiller's energy consumption, and exhibiting good energy efficiency. When the fresh air temperature is detected to be lower than the exhaust air temperature, the exhaust fan 8 and exhaust impeller 3 stop operating, and the fresh air is directly exhausted after simple filtration. This utilizes outdoor fresh air to improve indoor air quality, maintains positive indoor pressure, avoids unnecessary equipment operation, reduces energy consumption, and demonstrates excellent energy-saving and environmental protection performance.

[0052] Summer operation mode: As summer arrives and outdoor temperatures rise, the fresh air temperature sensor 6 detects that the fresh air temperature has reached or exceeded the set summer mode temperature, thus determining that the summer operation mode has been entered. The fresh air temperature sensor 6 and the exhaust air temperature sensor 9 monitor the fresh air temperature and exhaust air temperature in real time, respectively. When the exhaust air temperature is 2°C lower than the set temperature difference of the fresh air temperature, the exhaust fan 8 and the exhaust impeller 3 are started. The exhaust impeller 3 uses the principle of sensible heat recovery to transfer the cold air of the exhaust air to the fresh air, pre-cooling the fresh air. The pre-cooled fresh air then enters the cooling coil 12, reducing the cooling load of the cooling coil 12, reducing the energy consumption of the chiller, and achieving energy-saving operation.

[0053] Transitional Season Operation: During the transitional season, the system compares the measured temperature of the fresh air temperature sensor 6 with the set transitional season mode temperature to determine whether to enter this operating condition. When the fresh air temperature is lower than or equal to the exhaust air temperature, the exhaust fan 8 and exhaust impeller 3 stop operating, and the fresh air is directly sent into the room after simple filtration. This utilizes outdoor fresh air to improve indoor air quality, maintains positive pressure indoors, and avoids unnecessary equipment operation, thus reducing energy consumption.

[0054] Winter Operation Condition: In winter, when the fresh air temperature sensor 6 detects a temperature lower than the set winter mode temperature, the system enters winter operation condition. First, the water inlet valve of the cooling coil 12 is closed to prevent the water inside the coil from freezing and cracking. Temperature is continuously monitored by the fresh air temperature sensor 6, the secondary fresh air sensor 11, and the exhaust air temperature sensor 9. The temperature controller 14 calculates the average fresh air temperature from the fresh air temperature sensor 6 and the secondary fresh air sensor 11. When the average value is lower than the antifreeze lower threshold, the temperature controller 14 controls the exhaust fan 8 and the exhaust impeller 3 to preheat the fresh air. If the average temperature... If the temperature value is still below the lower threshold of the antifreeze, the temperature controller 14 turns on the electric heater 10 to ensure that the average temperature of multiple sensors is higher than the lower threshold of the antifreeze, thus preventing the cooling coil 12 from freezing and cracking. When the average measured temperature is higher than five degrees and lasts for more than five minutes, the electric heater 10 stops working to prevent it from wasting energy and shortening its service life due to prolonged operation. It has a good overheat protection effect. If the average value of the electric heater 10 is still lower than the lower threshold of the antifreeze after it has been running, in order to ensure the safety of the equipment, the temperature controller 14 turns off the fresh air temperature sensor 6 and the blower 7 and issues an alarm signal to notify the maintenance personnel to handle the situation.

[0055] Maintenance and Management: During the operation of the unit, regular maintenance is required. Regularly check the impellers and motors of the supply fan 7 and exhaust fan 8 to ensure normal operation. Check the cooling coil 12 for leaks, blockages, etc. Remove dust from the surfaces of the fresh air temperature sensor 6, exhaust air temperature sensor 9, and fresh air secondary sensor 11 to ensure accurate temperature detection. Simultaneously, analyze the operating data from the temperature controller 14 to identify and address potential problems promptly. Furthermore, adjust preset parameters as needed based on actual usage to optimize the unit's performance.

[0056] The fresh air handling unit 1 receives fresh air through a fresh air temperature sensor 6 and a blower 7, and exhausts fresh air through an exhaust fan 8 and an exhaust temperature sensor 9, facilitating a cycle of fresh air intake and filtration. During the cooling and exhaust process, the fresh air temperature sensor 6, the exhaust temperature sensor 9, and the secondary fresh air sensor 11 measure the temperature in real time to monitor temperature changes. The temperature controller 14 is a PLC remote controller, enabling remote PLC control. It facilitates automated numerical calculation and control, and intelligently and automatically responds to and adjusts to temperature changes in real time, adjusting the internal components of the unit. This provides anti-freezing and crack protection while significantly reducing energy consumption, resulting in excellent energy-saving and environmental protection effects, high safety, and ease of use.

[0057] The fresh air temperature sensor 6 includes an air supply valve pipe 601, a switch valve body 602, and a first sensor 603. The air supply valve pipe 601 is installed and connected to the inside and outside of the fresh air unit box 1, so that fresh air can enter the temperature adjustment chamber 4 through the air supply valve pipe 601. The switch valve body 602 can control the opening and closing of the air supply valve pipe 601. The first sensor 603 is correspondingly provided on the inner side of the air supply valve pipe 601, which can measure the temperature of the fresh air supplied into the box at the first time. The measurement is convenient and accurate. The fresh air temperature information monitored and measured by the first sensor 603 can be directly transmitted to the temperature controller 14, and the temperature controller 14 controls whether the switch valve body 602 is opened or closed, which is convenient for automated control.

[0058] The exhaust impeller 3 is installed in the middle of the fresh air handling unit box 1. It can stably blow air towards the exhaust temperature sensor 9 and the cooling coil 12. The exhaust impeller 3 uses the principle of sensible heat recovery to transfer the cold air of the exhaust to the fresh air, pre-cooling the fresh air. The pre-cooled fresh air then enters the cooling coil 12, reducing the cooling load of the cooling coil 12, reducing the energy consumption of the chiller, and achieving energy-saving operation. The blower 7 blows air into the fresh air handling unit box 1, which can stably blow external fresh air into the box and assist in stabilizing the blowing. The exhaust fan 8 blows air to the outside of the fresh air handling unit box 1 to assist in pre-cooling blowing, which is convenient for energy-saving use and the blowing circulation is stable.

[0059] The exhaust temperature sensor 9 includes an exhaust valve pipe 901 and a second sensor 902. After the temperature of the fresh air is measured by the fresh air temperature sensor 6, the exhaust temperature is measured by the second sensor 902 when the fresh air is discharged from the box. Both the fresh air and exhaust air have good measurement stability and accuracy, and the measurement standard is convenient for temperature control adjustment based on temperature difference. It has good adaptability. The exhaust valve pipe 901 can perform the exhaust function. After the fresh air is cooled, it is filtered by the exhaust filter plate 13 and finally exhausted through the exhaust valve pipe 901. During the exhaust process, the second sensor 902 performs stable measurement. It has good adaptability.

[0060] The exhaust filter plate 13 is a ventilation and dust filter plate. During exhaust, it plays a role in dust filtration. It can stabilize the ventilation process and play a good role in filtering and removing dust in the air. The opening and closing cover 131 makes it easy to put on and take off the exhaust filter plate 13, and makes it easy to remove and clean the exhaust filter plate 13 later. It is convenient to use and easy to maintain later.

[0061] The fresh air secondary sensor 11 includes a third sensor 111 and a fourth sensor 112. Both the third sensor 111 and the fourth sensor 112 are used for temperature monitoring and measurement. After the fresh air is measured once by the fresh air temperature sensor 6, it is then measured again by the third sensor 111 and the fourth sensor 112 next to its cooling coil 12. The air outlet pipe 901 and the second sensor 902 are measured twice respectively to prevent large temperature differences from affecting the normal operation of the device. The sensing measurement is relatively stable and accurate, and the practicality is excellent.

[0062] The fresh air unit box 1 is equipped with a wireless communication unit 15 on the outside. When the temperature controller 14 measures the temperature, the temperature change and its control parameters can be wirelessly transmitted to the external device by the wireless communication unit 15. The external device can also directly control the operation with the temperature controller 14 through the wireless communication unit 15. The remote parameter communication and control function is good and the practicality is excellent.

[0063] This makes the device easy to automatically adjust and control according to temperature changes, has excellent anti-freeze protection capabilities, and is relatively energy-saving and environmentally friendly, greatly reducing the waste of electrical and thermal energy.

[0064] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A self-controlled anti-freeze temperature control device for a fresh air handling unit, comprising a fresh air handling unit box (1), characterized in that: The fresh air unit box (1) is equipped with functional partitions (2) on both sides inside; The interior of the fresh air handling unit box (1) is provided with an exhaust impeller (3) located between two functional partitions (2). The interior of the fresh air handling unit box (1) is divided into a temperature adjustment chamber (4) and an air outlet filter chamber (5) by the functional partitions (2). The interior of the temperature adjustment chamber (4) is provided with a fresh air temperature sensor (6) and a blower (7) connected to the outside of the box, respectively. The interior of the air outlet filter chamber (5) is provided with an exhaust fan (8) and an exhaust temperature sensor (9) connected to the outside of the box, respectively. The inner middle of the temperature adjustment chamber (4) is provided with an electric heater (10), a fresh air secondary sensor (11) and a cooling coil (12), respectively. The middle of the air outlet filter chamber (5) is provided with an air outlet filter plate (13). The exhaust impeller (3) passes through the temperature adjustment chamber (4) and the air outlet filter chamber (5), and a temperature controller (14) is provided on the outside of the fresh air unit box (1).

2. The self-controlled anti-freeze temperature control device for a fresh air handling unit according to claim 1, characterized in that: The fresh air handling unit (1) receives fresh air through a fresh air temperature sensor (6) and a blower (7), and exhausts air through an exhaust fan (8) and an exhaust temperature sensor (9). The temperature controller (14) is a PLC remote controller. The temperature controller (14) is electrically connected to the exhaust impeller (3), the fresh air temperature sensor (6), the blower (7), the exhaust fan (8), the exhaust temperature sensor (9), the electric heater (10), the fresh air secondary sensor (11), and the cooling coil (12).

3. The self-controlled anti-freeze temperature control device for a fresh air handling unit according to claim 1, characterized in that: The fresh air temperature sensor (6) includes an air supply valve port pipe (601), a switch valve body (602), and a first sensor (603). The air supply valve port pipe (601) is installed inside the fresh air unit box (1) and is connected to the inside and outside of the temperature adjustment chamber (4). The switch valve body (602) is fixedly installed on the outside of the air supply valve port pipe (601). The first sensor (603) is installed at the pipe opening of the air supply valve port pipe (601) near the temperature adjustment chamber (4). The switch valve body (602) is an electrically controlled valve port. The temperature controller (14) is electrically connected to the switch valve body (602) and the first sensor (603).

4. The self-controlled anti-freeze temperature control device for a fresh air handling unit according to claim 1, characterized in that: The exhaust impeller (3) is installed in the middle of the fresh air unit box (1). The exhaust impeller (3) blows air towards the exhaust temperature sensor (9). The blower (7) is fixedly installed inside the fresh air unit box (1). The blower (7) blows air into the fresh air unit box (1). The exhaust fan (8) blows air out of the fresh air unit box (1).

5. The self-controlled anti-freeze temperature control device for a fresh air handling unit according to claim 1, characterized in that: The exhaust temperature sensor (9) includes an exhaust valve port pipe (901) and a second sensor (902). The second sensor (902) is installed on the side of the exhaust valve port pipe (901) near the exhaust filter chamber (5). The exhaust valve port pipe (901) is connected to the outside of the fresh air unit box (1). The exhaust filter plate (13) is located between the exhaust valve port pipe (901) and the exhaust impeller (3). The second sensor (902) is electrically connected to the temperature controller (14).

6. The self-controlled anti-freeze temperature control device for a fresh air handling unit according to claim 1, characterized in that: The air outlet filter plate (13) is a ventilation and dust filter plate. The top of the fresh air unit box (1) is provided with a switch cover (131), which is located directly above the air outlet filter plate (13).

7. The self-controlled anti-freeze temperature control device for a fresh air handling unit according to claim 1, characterized in that: The fresh air secondary sensor (11) includes a third sensor (111) and a fourth sensor (112). The third sensor (111) and the fourth sensor (112) are both located between the electric heater (10) and the cooling coil (12). The third sensor (111) and the fourth sensor (112) are both electrically connected to the temperature controller (14).

8. The self-controlled anti-freeze temperature control device for a fresh air handling unit according to claim 1, characterized in that: The outside of the fresh air unit box (1) is provided with a wireless communication unit (15), which is electrically connected to the temperature controller (14).

Images