High strength sealing material: The glove box body is usually made of 304 stainless steel material, which has good rigidity and deformation resistance. It can withstand a certain pressure difference between the inside and outside without deformation. The dense structure of the metal material also reduces the possibility of gas molecule penetration, providing a solid physical barrier for isolating the internal environment from the outside.
Laser welding process: The splicing part of the box adopts laser welding technology, which has the characteristics of energy concentration and small heat affected zone. It can achieve high-precision welding with narrow welds and minimal welding deformation. For glove boxes that require sealing, laser welding can achieve good sealing connections without affecting the structure and dimensional accuracy of the box, effectively reducing the probability of gas leakage.
Flange window design: The window flange is cut into a rectangular ring shape from a thick plate, with high strength and resistance to impact and compression deformation. It can open a sealing groove, and the flatness of the sealing support surface and sealing groove bottom surface is less than 0.1 mm/m; The flange window and the box body are welded continuously, and non-destructive testing is carried out on the weld seam. There is no leakage at the welding point. The vacuum sealing method adopts an integral annular "0" - shaped sealing ring embedded in the integral annular groove. The sealing ring has no joints, high sealing reliability, low leakage rate, and the box leakage rate is less than 0.006vol%/h.
Selection of sealing material
O-ring sealing: O-ring sealing with good elasticity and aging resistance is used. At the connection, with appropriate clamping force, the rubber strip can tightly adhere to the contact surface of the box, forming a tight sealing barrier.
Sealing of gloves themselves: Using butyl rubber gloves has the characteristics of good airtightness and low gas permeability, which can effectively prevent pollutants from outside the glove box from entering the box through the gloves.
Sealing inspection and maintenance
To ensure that the glove box always maintains high sealing performance, regular sealing tests are required. Helium mass spectrometry leak detection or oxygen-containing method can be used to regularly test the sealing integrity of the glove box.
Daily maintenance and upkeep
(1) In daily use, regular maintenance should be carried out on the sealing components of the glove box, and the sealing strips, sealing joints, etc. should be checked regularly for wear, aging, deformation, cracking, loosening, and other phenomena. If problems are found, they should be replaced and maintained in a timely manner.
(2) Keep the surface and sealing parts of the box clean, and avoid impurities such as dust and oil stains from adhering to the sealing surface, which may affect the sealing effect. Dust particles may embed into the sealing strip, disrupting the tight fit of the sealing surface and causing gas leakage.
(3) Regularly clean and maintain gloves to prevent chemical substances from contaminating the surface of the gloves and affecting their sealing performance. Avoid exposure to sunlight or high temperature baking that may cause the glove material to age. At the same time, regularly inflate the gloves to check for any damage or air leakage, and replace any faulty gloves in a timely manner.
Precautions for using glove box
When there is a significant difference between the internal pressure of the glove box and the external environmental pressure, it may cause deformation of the seals or failure of the sealing structure. So when operating the glove box, the pressure inside the box should not exceed the recommended range of the glove box manufacturer.
Strengthen the training of operators on the operation norms of glove box. For example, teaching operators to avoid excessive pulling of gloves during the use of glove boxes to prevent glove damage and leakage.
Establish a daily operation record table for the glove box, requiring operators to check the sealing status before using the glove box, confirm that there are no abnormalities, and then proceed with the operation. By standardizing operating procedures and strengthening supervision, the problem of decreased sealing performance caused by human factors can be reduced.
