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Long service life: good weather resistance, anti - aging, anti - cold, anti - inflammatory heat, resistance to dry and damp, flame retardant, anti - humidity, antistatic, light - proof, non - channeling, non - deformation, anti ultraviolet, tensile strength, long service life and so on. The shape is beautiful and the structure is strict. The whole window yarn is made of glass fiber monofilament plastic and flat woven yarn. The rest of the material is completed by one time pressing of PVC plastic and assembly. It solves the problem that the gap between the traditional screen window and the window frame is too large, and the sealing is not strict, so it is safe and beautiful and the sealing effect is good. Fiberglass Insect Screen Fiberglass Insect Netting,Screen Protector From Door,Fiberglass Window Screen,Home Fly Screen Window HEBEI TUOHUA METAL PRODUCTS CO.,LTD , https://www.penetting.com
1, to determine the working vacuum range must first check to determine the degree of vacuum for each process requirements. Because each process has its own vacuum range, it must be carefully studied and determined.
2. Determine the ultimate vacuum degree Check the ultimate vacuum degree of the vacuum pump system on the basis of determining the degree of vacuum required by the process, because the ultimate vacuum degree of the system determines the optimal working vacuum degree of the system. In general, the ultimate vacuum of the system is 20% lower than the working vacuum of the system and 50% lower than that of the foreline pump.
3, the type of gas to be pumped and the amount of gas extracted to determine the process requirements of the type of pumping and pumping. Because if the type of gas being pumped reacts with the liquid in the pump, the pump system will be contaminated. At the same time, consideration must be given to determining the appropriate venting time and the amount of gas generated during the pumping process.
4. The vacuum volume check determines the time required to reach the required vacuum level, the flow resistance and leakage of the vacuum piping.
Consider the pumping rate required to maintain the vacuum after achieving the required vacuum level under certain process requirements.
5, vacuum pump formula S = 2.303V/tLog (P1/P2)
among them:
S is the vacuum pumping rate (L/s)
V is the volume of the vacuum chamber (L)
t time required to reach the required vacuum (s)
P1 is the initial vacuum (Torr)
P2 is the required vacuum (Torr)
E.g:
V=500L
t=30s
P1=760Torr
P2=50Torr
Then: S=2.303V/tLog(P1/P2)=2.303x500/30xLog(760/50)=35.4L/s
Of course, the above formula is only a theoretical calculation result, there are several variables that are not taken into account, such as the flow resistance of the pipeline, leakage, the flow resistance of the filter, the temperature of the gas being pumped, and so on. In fact, safety factors should also be taken into account.
The vacuum pump is a rotary positive-displacement vacuum pump that must be used with a foreline pump in order to use it in a wider pressure range. Larger pumping speed is not sensitive to dust and water vapor in the pumped gas. Widely used in metallurgy and chemical industry , food, electronic coating and other industries.
A wide range of application, can be installed directly in the window frame, wood, steel, aluminum, plastic doors and windows can be assembled; corrosion resistance, high strength, anti aging, good fire resistance, do not need paint coloring.
Innocuous and tasteless.
The yarn is made of glass fiber, and it is fireproof and flame retardant.
It has anti - static function, not soot, good air permeability.
Transmittance
Well, it has a real stealth effect.
Automatic filter and UV protection to protect the health of the whole family.
Anti aging, long service life, reasonable design.
Green environmental protection: it does not contain chlorfluorides that are harmful to the atmosphere. It meets the requirements of ISO14001 international environmental protection certification, and the use of products will not produce any harmful pollution to the human body.
Purpose: for high-grade office buildings, residential buildings and various buildings, livestock farms, orchards, etc., it is the best protective product of insects, mosquitoes and flies.
Product specification
Mesh: 14x14, 16X16, 18x16.
Width: 0.6-2.7 meters.
Color: white, black, gray, gray and white.
Weight: about 120 grams per square meter.
The function of the vacuum pump is to remove gas molecules from the vacuum chamber and reduce the gas pressure in the vacuum chamber so that it can reach the required vacuum level. Generally speaking, there is a large range from atmospheric to extremely high vacuum, and so far no vacuum system has been able to cover this range. Therefore, in order to achieve different product process specifications, work efficiency and equipment operating life requirements, different vacuum sections need to select different vacuum system configurations. To achieve the best configuration, consider the following points when choosing a vacuum system: