When the elevator is running, how can the crossflow fan ensure the effective exchange of air inside and outside the car without affecting the pressure balance inside the car?
Publish Time: 2025-07-03
With the acceleration of urbanization and the increasing number of high-rise buildings, elevators have become an indispensable vertical means of transportation in people's daily lives. However, during the operation of the elevator, especially when there are many people during peak hours, the car space is closed and the air circulation is poor, which can easily cause passengers to feel stuffy, hypoxic and other discomforts. In order to solve this problem, more and more elevator systems have begun to install crossflow fans on the top of the car to achieve continuous exchange of fresh air from the outside and the air inside the car.1. The working principle of the crossflow fan and its application advantages in elevatorsThe crossflow fan is a special axial flow fan, which is characterized by large air volume, low noise, compact structure, and is suitable for installation in limited space. In the elevator system, the crossflow fan is usually installed on the top of the car or between the shaft wall, and is connected to the inside of the car through a duct system. When the elevator is running, the fan starts to introduce fresh air from the shaft or outside into the car, and at the same time discharges the dirty air, thus forming a continuous circulation air flow system.Unlike traditional exhaust fans, crossflow fans can provide a large air volume at a lower energy consumption, which is particularly suitable for air renewal needs in confined spaces and is an ideal choice for improving the comfort of elevator rides.2. Airflow path design: the key to achieving efficient ventilationIn order to ensure air exchange efficiency, the design of the crossflow fan needs to consider the location layout of the air inlet and outlet. Usually, the air inlet is set at the top of the car near the fan, while the air outlet is distributed at the bottom or side wall of the car, forming a top-down air convection pattern. This design not only helps to evenly distribute the fresh air, but also avoids passenger discomfort caused by excessive local wind speed.In addition, some high-end elevator systems also use intelligent sensing technology to automatically adjust the air volume according to the number of people in the car, ensuring energy-saving operation when there are few people and enhancing ventilation capacity when there are many people, so as to achieve the best air exchange effect.3. Pressure balance mechanism: preventing air pressure fluctuations caused by ventilationOne of the most worrying issues for air exchange in a closed space is the possible pressure imbalance. If handled improperly, it will lead to problems such as difficulty in opening the elevator door and discomfort in the ears of passengers. Therefore, the pressure balance mechanism must be fully considered when designing the crossflow fan.Modern elevators generally adopt a "micro-positive pressure" control strategy, that is, by accurately controlling the air supply and exhaust ratio, the air pressure inside the car is kept slightly higher than the external environment. This can effectively prevent external dust from entering the car without causing a significant pressure difference. At the same time, some systems are also equipped with return air valves or pressure relief channels to automatically release excess air pressure when the pressure is abnormal, thereby ensuring the safety and comfort of passengers.4. Sealing and filtration system coordination: improving air quality and safety levelIn order to further improve the quality of air exchange, many elevator systems have added primary or high-efficiency air filters at the air inlet of the crossflow fan, which can effectively prevent dust, pollen and some bacterial particles from entering the car. This design not only improves the cleanliness of the air, but also helps to reduce the load of the air conditioning system and improve overall energy efficiency.In addition, the elevator car itself has good sealing performance, which can prevent untreated air from directly infiltrating, thereby ensuring the controllability and effectiveness of the entire air exchange process. This comprehensive strategy of "sealing + filtering + circulation" allows passengers to enjoy a fresh and healthy air environment even in elevators that run for a long time.5. Intelligent management: achieving precise control and energy-saving operationWith the development of the Internet of Things and intelligent control technology, more and more crossflow fan systems have begun to integrate intelligent sensors and remote monitoring modules. These systems can adjust the fan operation status in real time by monitoring parameters such as temperature, humidity, and CO₂ concentration to provide air on demand. For example, the air supply frequency is increased during peak hours, and the power is reduced during no-load hours, thereby achieving energy conservation and emission reduction while ensuring comfort.Some systems can also be linked with the elevator control system. When an elevator outage or emergency is detected, it automatically switches to emergency ventilation mode to provide trapped passengers with necessary oxygen support and improve the level of safety protection.In summary, crossflow fan has successfully achieved effective exchange of air inside and outside the elevator car through scientific and reasonable airflow path design, advanced pressure balance mechanism, efficient air filtration system and intelligent operation management, while avoiding pressure fluctuations caused by ventilation. This not only greatly improves the passenger experience, but also improves the overall operation quality and safety of the elevator.
