What is the difference between high-efficiency air supply outlets and liquid tank air supply outlets?

High-efficiency supply air outlets and liquid tank supply air outlets are commonly used air supply devices in clean air conditioning systems, mainly to meet the requirements of different clean-grade environments (such as operating rooms, laboratories, electronic factories, etc.). The core differences between the two lie in aspects such as sealing methods, structural designs, and applicable scenarios. The following is a specific comparison:
I. Sealing Methods and Principles
1. High-efficiency air supply outlet
Sealing method: Mechanical sealing (such as bolted sealing gasket) or rubber strip sealing (such as EVA rubber strip, or silicone rubber strip) is usually adopted.
Principle: By applying physical pressure, the sealing element is made to closely adhere to the frame, blocking the path of air leakage and ensuring the cleanliness of the supply air.
Features: Simple structure and easy installation. However, due to long-term use, the sealing performance may decline due to aging of the sealing parts, and regular maintenance and replacement are required.
2. Liquid tank air supply outlet
Sealing method: Liquid tank sealing is adopted (the tank is filled with inert liquids, such as silicone oil, mineral oil, etc.).
Principle: The frame of the high-efficiency filter is inserted into the liquid tank, and a sealing layer is formed by the surface tension of the liquid to prevent unfiltered air from seeping into the clean area.
Features:
It has extremely strong sealing performance and can achieve zero leakage. It is suitable for high cleanliness grade requirements (such as ISO level 5 and above).
Liquid sealing does not require mechanical compression, avoiding the deformation of the filter frame due to force and extending its service life.
During maintenance, only liquid needs to be replenished and there is no need to frequently replace the seals.
Ii. Differences in structural design
Compare the dimensions of the high-efficiency supply air outlet liquid tank supply air outlet
Core components: high-efficiency filter, gasket, static pressure box, diffuser plate, high-efficiency filter (with liquid tank frame), liquid tank frame, static pressure box
The filter installation: The filter is fixed on the frame by bolts or clips, and a space for pressing should be reserved. The filter is directly inserted into the liquid tank, and the frame is in contact with the liquid surface of the liquid tank, making the installation more convenient
The appearance and size are compact in structure and relatively thin in thickness, making it suitable for scenarios with limited space. Due to the inclusion of a liquid tank structure, the overall thickness is relatively large, and sufficient installation depth needs to be reserved
Weight and material: The material is mostly galvanized steel plate or stainless steel, which is relatively light in weight. The liquid tank frame needs to be corrosion-resistant (such as 304 stainless steel), and it is slightly heavier
Iii. Applicable Scenarios and Cleanliness Levels
1. High-efficiency air supply outlet
Applicable scenarios:
Medium and low cleanliness grade environments (such as ISO 6-8 grades), such as general clean rooms, food workshops, non-sterile areas of pharmaceutical factories, etc.
In scenarios where the sealing performance requirement is moderate or where filters need to be replaced frequently (such as where the regular maintenance cost is relatively low).
Limitations: The sealing reliability is lower than that of the liquid tank type. Long-term use may cause the sealing parts to fail due to vibration or temperature changes. It is not suitable for strictly sterile or high-risk environments.
2. Liquid tank air supply outlet
Applicable scenarios:
High cleanliness grade environments (such as ISO level 5 and above), such as operating rooms, biosafety laboratories, semiconductor chip workshops, sterile pharmaceutical workshops, etc.
Scenarios with extremely high requirements for sealing and cleanliness (such as preventing the leakage of harmful aerosols and avoiding cross-contamination).
Advantages: The liquid tank seal can effectively cope with negative pressure environments or high airflow impacts, ensuring no leakage at the edge of the filter and meeting strict standards such as GMP and FDA.
Iv. Maintenance and Cost
1. High-efficiency air supply outlet
Maintenance points: Regularly check the aging condition of the gasket. Generally, replace the sealing parts 1-2 times a year. When replacing the filter, the installation accuracy needs to be readjusted.
Cost: The initial purchase cost is relatively low, but the long-term maintenance cost is relatively high (the frequency of seal replacement is high).
2. Liquid tank air supply outlet
Maintenance points: Regularly check the liquid level in the liquid tank and replenish the liquid (usually once every 2-3 years); When replacing the filter, only the old part needs to be removed and the new one inserted. There is no need to adjust the sealing structure.
Cost: The initial procurement cost is relatively high (the liquid tank structure is complex), but the long-term maintenance cost is low, making it suitable for high-cleanliness demand projects that operate for a long time.
V. Summary: How to Choose?
Give priority to choosing high-efficiency supply air outlets: If the cleanliness level requirement is not high, the budget is limited, the maintenance frequency is acceptable, or the installation space is narrow.
Give priority to the liquid tank supply air outlet: If strict leakage control is required (such as biosafety, high-precision manufacturing), high cleanliness level (such as a Class 100 clean room), or low maintenance cost and long-term reliability are pursued.
Sample scenario:
Hospital operating rooms and COVID-19 testing laboratories: Liquid tank supply air outlets must be adopted to prevent the leakage of virus aerosols.
For the 1000-level clean room in the electronics factory, high-efficiency supply air outlets (if the sealing requirement is medium) or liquid tank supply air outlets (if long-term stable operation is needed) can be selected according to the budget.