Explanation of key points in clean room design

Introduction: In our daily lives, we don’t often hear about clean rooms. The clean room that everyone imagines may be a relatively clean house, but clean rooms are very different from the traditional houses where we live. The big difference is that a clean room is an industrial or manufacturing workshop that uses the principle of air flow to keep the room in a relatively clean state at all times. When designing a clean room, you need to pay attention to many issues. Below, the editor will introduce you to the relevant knowledge of clean room design. ?

Key points of clean room design:

1. Clean room dust-free room system:

The indoor air purification system can be divided into horizontal laminar flow and vertical layer Flow and turbulence. The choice of airflow pattern is based on conventions and depends on the working parameters of the room.

2. Cleanliness and number of air changes:

The cleanliness of a room depends on the number of air changes per unit time. Therefore, the working nature of the room and the production process requirements should be carefully considered. Then determine the technical parameters of the purification system.

3. Structure:

In order to ensure that the air flow is almost uninterrupted, it is necessary to carry out structural design, and the necessary caution can prevent the accumulation of dust anywhere in the room.

4. Design plan:

To determine the design plan, you must first carefully consider the working nature of the room and the airflow conditions therein. Workshops that generate a large amount of dust should not use ground air supply, and workshops with high cleanliness requirements should be as far away from other workshops as possible.

5. Materials:

As a clean room ceiling, the materials for the walls and floors must be materials that are not suitable for cracking, not easily stained by particles, and almost dust-free. In addition, it depends on the room. Working conditions, it is also necessary to consider whether the chemical properties of the material are stable.

　6. Pressure and airflow:

In order to ensure the cleanliness of the room, it is necessary to prevent outside polluted airflow from entering the room. To achieve this purpose, the room must maintain positive pressure. In order to obtain the required room pressure, appropriate fresh air must be added.

7. Auxiliary equipment:

If necessary, some auxiliary equipment must be installed: such as air indicators for fresh air vents, transfer windows on partitions, etc. These equipment must be suitable for the requirements of the room, and their functions must be truly understood.

8. Control of people and objects:

People and objects are the main dust sources in the clean room, so they must Adequate control, for example: before entering the clean room, all people must pass through the human purification system, change dust-free clothes, and receive basic education on the functions of the purification system.

9. Water supply, drainage and air supply devices and power supply:

Depending on the workshop to be run, provide the necessary water supply and drainage devices, air supply devices and power supply. These devices and the The equipment must be easy to use and designed, and must not interfere with the air purification system.

Requirements for clean room decoration and design

1. Clean room layout

Clean rooms generally include three parts: clean area, quasi-clean area and auxiliary area. .

The floor plan of the clean room can be arranged in the following ways:

Wrapped verandah: the verandah can have windows or no windows, and can be used for visiting and placing some equipment. There is on-duty heating in the outer verandah. Exterior windows must be double-seal windows.

Inner corridor type: The clean room is located on the periphery and the corridor is located inside. The cleanliness level of this corridor is generally higher, even the same level as the clean room.

Two-end type: the clean area is located on one side, and the quasi-clean and auxiliary rooms are located on the other side.

Core type: In order to save land and shorten pipelines, the clean area can be used as the core, surrounded by various auxiliary rooms and hidden pipeline spaces. This method avoids the impact of outdoor climate on the clean area. Impact, reducing heating and cooling energy consumption, which is beneficial to energy saving.

2. Personal purification route

In order to minimize the pollution caused by human activities during operation, personnel must change clean clothes and shower, bathe and disinfect before entering the clean area. These measures are called "personal purification" or "human purification" for short.

The room where clean clothes are changed in the clean room should be provided with air, and positive pressure should be maintained for other rooms such as the entrance side, and a slight positive pressure should be maintained for toilets and showers, while toilets and showers should maintain negative pressure .

3. Material purification route

Various objects must undergo purification treatment before being sent to the clean area, referred to as "material purification".

The material purification route and the human purification route should be separated. If materials and personnel can only enter the clean room at the same place, they must also enter through separate doors, and the materials must first undergo rough purification treatment.

For occasions where the production line is not strong, an intermediate warehouse can be set up in the middle of the material route.

If the production line is very strong, a through-type material route is adopted, and sometimes it is necessary to set up multiple purification and transfer facilities in the middle of the through-line.

In terms of system design, a lot of raw particles will be blown off during the rough purification and fine purification stages of the clean room, so the relatively clean area should maintain negative pressure or zero pressure. If the risk of contamination is high, then Negative pressure should also be maintained in the direction of the entrance.

The above is an explanation of the knowledge about clean room design precautions introduced by the editor. Everyone knows that we need a dry, clean place for production, and a clean room is such a place. Because the products produced are different in different places, the design requirements for clean rooms are different. The clean room not only provides cleanliness, but also needs to be kept clean, and can exclude a lot of particles from the outdoors. The editor's introduction ends here, I hope it can help everyone.