1. The main mechanical seal form of MDEA amine liquid circulating pump
(1) According to the conditions of use, it can be divided into: ① high-speed seal and ordinary seal (mainly different online speed): ② high-pressure seal and low-pressure seal; ③ high-temperature seal, normal temperature seal, low-temperature seal; ④ seals for pumps, compressors and kettles ; ⑤ Corrosion-resistant sealing, anti-particle sealing.
(2) According to the structure, the classification is as follows: ① Rotary seal and static seal; ② External seal and internal seal: ③ Outflow seal and internal flow seal; ④ Multiple spring seal and single spring seal.
2. MDEA amine liquid circulation pump rotary and static mechanical seal characteristics
(1) Rotary mechanical seal features: the compensation mechanism is an elastic element such as a spring, which can rotate with the shaft. Because it is easy to install, this structure is usually used in common situations, but its weakness is that it is easy to produce imbalance and consumes rotating power, so it is not suitable for pumps with higher speeds.
(2) Features of static mechanical seal: Its compensation mechanism is also an elastic element, but it does not rotate with the shaft and can be applied to pumps with higher speeds.
3. The characteristics of internal mechanical seal and external mechanical seal
(1) The characteristics of the built-in mechanical seal: the static ring is installed inside the sealing gland, and the end face of the static ring faces the working cavity. It is suitable for places where the temperature and pressure are high, but not very corrosive.
(2) Features of external mechanical seal: The static ring is installed on the outside of the sealing gland, and the end face of the static ring is opposite to the working cavity. It is suitable for places with low pressure but strong corrosiveness.
4. The characteristics of internal flow mechanical seal and external flow mechanical seal of MDEA amine liquid circulation pump
(1) Internal flow mechanical seal: The leakage direction of the medium is toward the axis, and the general mechanical seal is in this form.
(2) Outflow mechanical seal: the direction of medium leakage diverges to the surroundings. Because of its large leakage, it is generally used occasionally when transporting corrosive media when the pressure and temperature are not high.
5. Features of multiple spring mechanical seals and single spring mechanical seals
(1) Multi-spring mechanical seal: a series of small springs arranged in an annular direction. It has the advantages of small size and uniform elasticity. It is suitable for high-speed pumps, but it is not suitable when the medium is corrosive.
(2) Single spring mechanical seal: A large spring is used as an elastic element. It has a large size and uneven elasticity, which is suitable for ordinary occasions.
6. Definition of balanced mechanical seal and unbalanced mechanical seal of MDEA amine liquid circulating pump
(1) Definition of balanced mechanical seal: It is determined according to the load factor K. If K<1.0, it is a balanced type, which is mostly used at high pressure.
(2) Definition of unbalanced mechanical seal: contrary to balanced type, if K≥1.0, it is unbalanced, and it is generally used at ordinary pressure.
7. Sealing characteristics of double end face mechanical seal and single end face mechanical seal
The double-end mechanical seal is to install two sets of mechanical seals together in a face-to-face or back-to-back form. It is mainly used in places where it is toxic, flammable and explosive, volatile and easy to crystallize, high or low temperature, or transporting gas and forming high vacuum. It needs to inject a sealing liquid into the sealed cavity formed on both ends during work, which can play a role in blocking, cooling and lubricating. The sealing liquid should be clean and good in lubrication to meet the needs. For a single-end mechanical seal, there is only one dynamic and static combined sealing surface, that is, a simple combination of a pair of dynamic and static rings.
8. Features of tandem mechanical seal
It installs two sets of mechanical seals in the same direction, and the outermost seal is a safety seal to ensure that dangerous media will not leak into the atmosphere. In some cases, it is also used in high-pressure occasions, and the pressure of the sealed cavity is gradually reduced.
9. Features of bellows mechanical seal
The bellows mechanical seal eliminates the compensation ring seal ring and friction resistance, and the compensation ring seal ring is changed to the position of the spring seat. The followability of the compensation ring is improved, and at the same time, the compensation ring seal ring is prevented from being easy to string and vibrate. A condition of wear. Generally speaking, metal bellows are mostly used in high temperature applications, while PTFE bellows are mainly used in corrosive media.
10. Features of MDEA amine liquid circulating pump cartridge mechanical seal
Cartridge mechanical seal is a combination of dynamic and static rings, glands, shaft sleeves, etc. into a whole. During installation, it is only necessary to fix the gland and the shaft sleeve, and then remove the positioning block. Its installation is more convenient, eliminating the bad influence of other forms of installation in the past. In general, the thickness of the positioning stopper corresponds to the compression amount of the spring, which is easy to observe from the outside and easy to adjust.
