From: https://zhuanlan.zhihu.com/p/143673935

1. Basics

Molecular sieve ingredients:Molecular sieves are synthetic zeolite materials with precise and uniform structure and pore structure. This makes it possible to preferentially adsorb gases and liquids according to molecular size and polarity. Zeolites are naturally occurring, highly porous, crystalline solids that belong to the chemical class known as aluminosilicates.

There are four main types of adsorption molecular sieves:3A,4A,5A and 13X. The type depends on the chemical formula and structure of the molecule, which determines the pore size of the molecular sieve.

the role of molecular sieve:The working principle of molecular sieve is to adsorb gas or liquid molecules smaller than the effective diameter of its pores, and at the same time exclude those molecules larger than the opening, which determines the oxygen production efficiency and concentration.

2. domestic oxygen machine outside the molecular sieve brand

Abroad:

Honeywell International (UOP)

Arkema, France (CECA)

Domestic: 

Luoyang Jianlong Micro-nano New Materials Co., Ltd.

Jiangsu Guoci New Material Technology Co., Ltd.

Jiangsu Jieoukang Technology Co., Ltd.

Beijing Peking University Pioneer Technology Co., Ltd. (only for industry, not for medical treatment)

Shanghai Hengye Microcrystalline Materials Technology Co., Ltd.

The above rankings are in no particular order.

In general, domestic and foreign molecular sieves will have good or bad, grade points, not necessarily said that imports are good, imports also have ordinary molecular sieves. In the same way, the domestic molecular sieve is not necessarily bad, the choice of high grade molecular sieve is also better than the import grade low. Therefore, we should not blindly pursue the so-called import is a good thinking, but should actually look at the quality of products.

3. domestic oxygen machine molecular sieve cat

At present, most of the oxygen generators on the market use domestic molecular sieves, but why do they still promote the use of imported molecular sieves? Because molecular sieves are mixed, as long as the structure and size of domestic and imported molecular sieves are consistent, even if 10% of imported molecular sieves are used, imported molecular sieves can also be promoted. From the perspective of supervision, it belongs to the edge ball, and it is also the embodiment of the broad and profound Chinese characters. Some completely use domestic molecular sieves, and some use imported molecular sieves. Therefore, when you choose an oxygen generator, try to choose a brand with long machine life, stable oxygen concentration and low after-sales rate.

Time is often the best proof, saving money is small, delaying illness is big, and hospitalization after deterioration of key illness, you still think that the patient is too weak, in fact, it is likely that the patient inhales ineffective oxygen.

4. how to judge the molecular sieve of an oxygen generator manufacturer

Before selecting the aircraft, it is impossible to judge.

Dismantle the machine to open the molecular sieve storage tank, the naked eye can not necessarily see, remember one of the characteristics of molecular sieve? Strong adsorbability, which determines the efficiency and concentration of oxygen production, only in specific experimental conditions to test, in order to get the data, ordinary consumers themselves almost can not detect.

5. molecular sieve filling technology and mixing ratio is the core technology

mentioned earlierThe conversion efficiency of the American sodium sieve is not as good as that of the lithium sieve, which has high moisture resistance and stability; the French lithium sieve has fast oxygen and high adsorption efficiency, but it is easy to get damp. Each has its own advantages and disadvantages. Traditional oxygen generator manufacturers will use a single proportion of sodium or lithium molecular sieves, and later popular mixing and filling. The proportion of sodium and lithium used in each model has always been a trade secret within the manufacturer. How much the molecular sieve is filled and the tightness determines the ability of continuous oxygen supply. If the filling technology is not tight and the friction is too large, it will cause easy moisture. After the machine is used for 1-2 years, the oxygen concentration will drop rapidly. Some oxygen makers do not have a low oxygen concentration alarm function, which is difficult for ordinary consumers to find.

In order to save costs, some small factories in China use manual filling of molecular sieves. Large factories now generally use computer-controlled equipment for filling. The relative advantages of manual filling are better proportional control, fewer process defects and good installation stability. Purchasing equipment and molecular sieve mixing and filling technology are all hidden costs. The machines are good, the selling is naturally expensive, and the oxygen output is stable. However, many consumers often only see the purchase cost of materials, not the hidden cost.

Summary:

1, ordinary consumers can not see the molecular sieve is good or bad, the purchase of the machine priority to choose a high brand awareness.

2. Molecular sieve is a delicate accessory. Regular startup and operation of the machine is more conducive to preventing molecular sieve from getting damp.

3, molecular sieve is only raw materials, the core is the manufacturer of lithium sodium molecular sieve mixing ratio, filling technology.