Titanium pump is to make use of the characteristics of corrosion resistance, small specific gravity, high strength, and good high and low temperature comprehensive mechanical properties of titanium and titanium alloys when selecting materials for equipment manufacturing.
Features and advantages of titanium pump
The pump has excellent corrosion resistance and can withstand the corrosion of most organic acids, inorganic acids, organic compounds, alkalis, and salt solutions. sex. It overcomes the shortcomings of packing and mechanical seal, has the advantages of simple structure and reliable sealing, and fundamentally solves the problem of easy wear of the shaft sleeve and packing of packing seal. Widely used in soda production, salt production, metallurgy and mining, petrochemical, and other fields.
Titanium pumps are a type of corrosion-resistant pump. Refers to pumps made of titanium or titanium alloy parts that are in contact with the liquid being sent. Titanium or titanium alloy pumps for the chemical industry are mostly centrifugal pumps.
It can be used to transport a variety of organic and inorganic corrosive liquids, especially suitable for transporting chlorine-containing salt solutions, and cannot transport fuming nitric acid, hydrofluoric acid, and hydrochloric acid with a concentration of >30%.
Titanium and titanium alloy pumps are more expensive, and are generally only used when corrosion-resistant pumps made of other materials are not competent.
Titanium or titanium alloy centrifugal pumps are generally cast and welded, with a flow rate of 5.7-400m3/h and a head of 4-125m.
According to the working principle of the titanium pump, it is also called a sputter ion pump.
Degassing mechanism
(1) Extraction of active gases
The removal of gases such as N2, O2, CO, and CO2 mainly depends on the chemical adsorption of the titanium film deposited on the inner wall of the anode cylinder.
(2) Extraction of hydrogen
There are chemical adsorption, diffusion, absorption, and dissolution for the extraction of hydrogen.
(3) Extraction of inert gas
The elimination of inert gas mainly depends on the “burying” of ions. When the ionized inert gas ions bombard the cathode, there are the following three situations:
a. Ions are driven directly into the cathode, or into the titanium deposit on the anode plate opposite the edge of the cathode;
b. The obliquely shot ions cut into the surface of the cathode, and the ions and titanium are thrown off together and deposited around the cathode plate or elsewhere;
c. The ions are not driven into the plate, but get electrons from the cathode and recombine into neutral atoms, which are then reflected the titanium film on the inner surface of the anode.
Titanium pump performance
(1) Ultimate pressure: 10-8 Pa
(2) Pumping speed:
The pumping speed of the titanium pump is related to the anode voltage and the strength of the magnetic field. When the magnetic field is strong, the pumping speed is also high, and the anode voltage corresponding to the best pumping speed is also high. The pumping speeds of commonly used titanium pumps are 25 liters/second and 5 liters/second. For occasions that require high pumping speed, the basic structural units can be connected in parallel to make the pumping speed reach 50 liters/second, 100 liters/second, etc.
(3) Starting pressure: 10-2 Pa
(4) Lifespan:
a. Cathode exhaustion life
The cathode titanium plate renders the pump unusable due to sputtering through.
b. Anode peeling life
When the thickness of the titanium film deposited in the anode is too large, it will peel off, resulting in irregular and strong pressure changes in the pump, making the pump unusable.
c. Anode full life
A large amount of helium and hydrogen is adsorbed and dissolved on the anode, and the pump can no longer adsorb gas when it reaches saturation.
Under normal use, the life of the sputter ion pump can reach tens of thousands of hours.
