Vertical structure: suitable for burying in the ground, it will not be affected by the hot air of the motor, air temperature and sunshine, etc., and it is easy to keep cold; it can reduce the suction height of the pump, increase the filling head, and improve the effective NPSH; the vertical structure also It is beneficial to exhaust air, so that the suspension shaft has sufficient height to facilitate the arrangement of the shaft sealing device, so the pump is also called a vertical barrel pump.
Symmetrical structure: The overall structure of the pump strives to be symmetrically arranged so that it can deform uniformly in the cold state. The cold head generally adopts a two-stage mechanism, the first stage reaches 80K, and the second stage reaches a temperature of 10K.
Double-layer shell: In order to keep cold and facilitate the transportation of dangerous media, it is usually made into a double-layer shell. The inner shell is subjected to pump pressure, and the suction pressure is between the inner shell and the outer shell, which can appropriately reduce the strength requirements of the inner shell. The outer shell needs to be made into a vacuum interlayer, which has achieved the effect of heat insulation.
Advantage:
(1) Cryopumps have incomparable advantages over other products in obtaining clean and oil-free vacuum. It can be used as a standard to study the degree of vacuum pollution by other vacuum pumps;
(2) The cryogenic pump has a large pumping speed in removing water vapor and other humid mixtures;
(3) The cryopump also has a large pumping speed in extracting light weight molecules;
(4) In the vacuum equipment requiring large pumping speed, the cryopump is the most economical. Commercial cryopumps can provide high pumping speeds in small bores
(5) The cryopump works based on low temperature adsorption, no other electronic materials are required, and there will be no fluctuation;
(6) There are no moving parts in vacuum, high stability, and no sealing problems;
(7) The installation of the cryopump does not require any orientation;
(8) The cryopump can also selectively extract a certain gas.