Explanation of Common Terms for Metal Bellows


Wave shape
  1. It is the shape of the wave after hydroforming, and it is the most basic element constituting the metal bellows.
2.O.D
    Outer dimensions of metal bellows
3.I.D
    Inner diameter of metal bellows
4. Wave distance
    Distance between two waves
5. Itinerary
    Difference between free length and compressed length
6. Stretching amount
    Metal bellows stroke divided by bellows free length
7. Vacuum degree
    The degree of thinness of a gas under vacuum is usually expressed by "high vacuum" and "low vacuum". A high vacuum degree means that the vacuum degree is "good", and a low vacuum degree means that the vacuum degree is "poor". Torr is usually used as the unit. In recent years, internationally, Pa has been used as the unit. 1 Torr = 1/760 atm = 1 mmHg = 133.322 Pa (or 1 Pa = 7.5 x 10-3 Torr)
8. Service life
    Number of reciprocating motions of metal bellows under technical standards.
9. Stiffness
    The force required to make the metal bellows produce a unit displacement is the basis for calculating the elastic reasoning of the bellows.
10. Stress
    The force of a gas molecule acting on a unit area of ​​the container wall is represented by "P".
11. Displacement
    The length of metal bellows allowed to move under the action of force. Usually there are axial and radial points.
12. Fluid
    The substance flowing through the cavity.
13. Flow
    The amount of gas flowing through an arbitrary cross section per unit time, the symbol is represented by "Q", and the unit is Pa · L / s or Torr · L / s.
14. Conduction
    Represents the ability of a vacuum pipe to pass gas. The unit is liters per second (L / s). Under steady state, the pipeline conductance is equal to the pipeline flow divided by the pressure difference across the pipeline. The symbol is written as "U". U = Q / (P2- P1)



评论

发表评论

此博客中的热门博文

Common Faults and Solutions of Nichwell Glove Box (2)

图片
1. Turn off the cycle and analyzer at the same time Causes: ① the pressure in the tank is too high in an instant, exceeding + 12mbar, the system will automatically protect; ② the voltage is unstable, causing system protection. Methods: ① check whether the pressure setting is correct, whether the pressure sensor is abnormal, whether the box vacuum valve or air supply valve is damaged, and then open the analyzer and cycle after the pressure returns to normal. ② Check whether the vacuum pump is broken and cannot operate. 2. Main antechamber and min antechamber can't replenish air Causes: ① the air hole leading to the large and small bins in the glove box may be blocked by plastic film; ② whether the solenoid valve is not opened. Methods: ① determine the position of air hole and dredge the pipeline according to the pipeline direction; ② check the pipeline and solenoid valve. 3. Main antechamber and min antechamber are unable to pump air Causes: ① the suctio
阅读全文

Application of Leybold Vacuum Pump in Refrigeration Equipment

The structure and working principle of Leybold vacuum pump The commonly used vacuum pump is the Leybold vacuum pump, which relies on the rotary vane to periodically change the working volume of the pump chamber (cylinder) to pump air. The structure of the Leybold vacuum pump is similar to that of a reciprocating piston compressor. When working, the suction pipe is connected to the vacuum container, and the exhaust pipe is directly connected to the atmosphere. Leybold vacuum pumps have a large pumping capacity, with a pumping rate ranging from 45 to 20000 cubic meters per hour. The ultimate pressure of a single-stage pump is about 103 Pa, and a two-stage pump can reach 1 Pa. Leybold vacuum pumps can be used for vacuum distillation, vacuum concentration, vacuum crystallization, vacuum filtration, vacuum drying and concrete vacuum operations. If a condenser is installed at the suction port of the pump, the gas containing steam can be removed; if a filter is installed, the dust-containin
阅读全文

Dazzling under the Light, use the Lighting to Create a Perfect Family Atmosphere

图片
The lighting design of a family is indispensable. Lighting is the soul of space. Different types of lighting can also create different light and shadow effects. In the design of home decoration, there are many points to pay attention to in the design of home lighting. The living room should be very rich and layered, the restaurant should be romantic and stylish, the study and kitchen should be bright and practical, the bedroom should be warm and comfortable, and the bathroom must be round and refreshing. Classification of Home Lighting : Indoor home lamps can be divided into chandeliers, ceiling lamps, wall lamps, spot lamps, table lamps, floor lamps according to the installation method. Chandeliers: Today's chandelier can basically be adjusted in height, which can be limited to space market needs with different heights. But it is best not to fall too short, so as not to block your sight or feel really glare. Chandeliers are commonly used in homes as living rooms, be
阅读全文