The term "vacuum" refers to a gas state in which the pressure is lower than 101,325 Pa in a given space. In the vacuum state, the degree of leanness of the gas is usually expressed by the pressure value of the gas. Obviously, the smaller the pressure value, the thinner the gas. There are various vacuum pumps in the industry. There are prescribed test methods for the performance of various pumps. The main parameters are:
1. Ultimate vacuum (commonly referred to as vacuum degree): the vacuum pump is connected to the detection container, and after the gas to be tested is placed, the gas is continuously pumped for a long time, and when the gas pressure in the container does not decrease and maintains a certain value, This pressure is called the ultimate vacuum of the pump. The smaller the value, the closer it is to the theoretical vacuum.
2. Pumping rate: The volume of gas flowing through the suction port of the vacuum pump per unit time. Traditional industrial vacuum pumps are generally large in volume, and the pump requires special vacuum pump oil and lubricating oil. The medium gas contains a large amount of oil mist.
With the development of the instrumentation industry and people's requirements for environmental protection, miniature oil-free vacuum pumps have emerged in various countries. Generally, there are the following rules: the price of the pump is closely related to the vacuum index. The vacuum degree index is the main indicator that manufacturers in various countries are striving for. It reflects the overall strength of the corresponding fields of machining, sealing technology and materials science, and is also an important means for producers to obtain profits. In order to increase the vacuum index, it is necessary to have a higher sealing condition, so that it is necessary to use components with more precise dimensions and better material properties, so that the production cost is greatly improved. And the increase in price is far greater than the increase in the vacuum indicator. Of course, the increase in pumping rate will also cause the price to rise, but its increase is not large. Therefore, when selecting a micro vacuum pump, it is necessary to carefully set the vacuum degree index, followed by the pumping rate, so as to best balance the performance and cost. Due to the use of very precise sealing parts, the high vacuum micropump has higher requirements on the cleaning conditions, temperature parameters and medium composition of the working environment. Vibration and noise. The higher the pumping rate and vacuum of the pump, the greater the vibration and noise.
Detailed Description:
Product Name :Climbing Raincoat
Usage: is very suitable for outside sport ,climbing etc in the raining days.
Service: ODM, OEM and buyer label service available.
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Size |
Each size is available |
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Material |
PVC/PU/EVA/PE/PEVA/POLYESTER.etc |
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Design |
Designs can be choosen, customized works |
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Feature |
High quality with lower price. |
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Color |
Blue,yellow, black, red,transparent etc. customized |
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Logo |
Offset printing, screen printing |
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Package |
Plastic bag |
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Sample Cost |
According to item`s work and value |
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Sample Time |
In 7days. |
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leading time |
30 days |
Climbing Raincoat
Motorcycle Rain Jacket, Outdoor Rain Gear, Mens Waterproof Coat, Climbing Raincoat
Zhejiang CC Industrial And Trading Co., Ltd , https://www.ccraincoats.com