Introduction of components and installation matters of mechanical seal for high temperature hot water pump

Mechanical seal for high temperature hot water pump is an oil seal device for rotating machinery. Since the transmission shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment. The medium in the equipment leaks out through the gap. If the pressure is lower than atmospheric pressure, air will leak into the equipment, so there must be a shaft seal to prevent leakage.u200bu200b
The main components of the mechanical seal, including moving ring and static ring. Able to maintain a tight fit to form a sealing surface to prevent media leakage. The dynamic and static rings are required to have good wear resistance. The dynamic ring can move axially to automatically compensate for the wear of the sealing surface, so that it fits well with the static ring. The static ring has a floating property and acts as a buffer. The auxiliary seals mainly refer to the sealing ring and elastic compensation mechanism, mainly including springs and push rings. It mainly plays the role of sealing the static ring and the moving ring, and also plays the role of floating and buffering. The auxiliary sealing element of the static ring is required to ensure the sealing between the static ring and the gland, so that the static ring has a certain degree of floating; the auxiliary sealing element of the moving ring ensures the sealing between the moving ring and the shaft or the shaft sleeve. The material is required to be close to the medium in terms of heat resistance and cold resistance.u200bu200b
It also includes elastic elements, which mainly play the role of compensation, preloading and buffering, and are also factors that generate a reasonable specific pressure on the sealing end face. It is required to maintain elasticity at all times to overcome the friction of auxiliary seals and transmission parts, and to activate ring compensation. The material is required to be corrosion resistant. Transmission parts, receptacles and keys or various screws. The transmission parts include transmission pins, transmission rings, transmission seats, transmission sleeves, transmission keys, transmission lugs or toothed couplings, and their function is to transmit the torque of the shaft to the transmission ring. The materials are required to be corrosion-resistant and wear-resistant.u200bu200b
Fasteners include set screws, spring seats, glands, assembly sleeves, and shaft sleeves. It plays the role of positioning and tightening the static and dynamic rings. It is required to be positioned correctly, to ensure that the sealing surface of the friction pair is in the correct position, and to maintain a well-fitted spring specific pressure; at the same time, it is required to be easy to disassemble and assemble, easy to install, and can be reused; pay attention to the inversion of the sealing ring when it cooperates with the auxiliary seal. Angle and pressure elastic amount, pay special attention to the requirements of corrosion resistance and wear resistance at the joint between the dynamic ring seal and the shaft sleeve, and use hard surface cladding if necessary.u200bu200b
After understanding the components of the mechanical seal for high temperature hot water pumps, it is necessary to understand the matters needing attention when installing the mechanical seal.u200bu200b
1. The sealing part of the equipment should be kept clean during installation, the sealing parts should be cleaned, and the sealing end face should be intact to prevent impurities and dust from being brought into the sealing part;
2. It is strictly forbidden to hit and knock during the installation process, so as not to damage the friction of the mechanical seal and cause the seal to fail;
3. During installation, a layer of clean mechanical oil should be applied to the surface in contact with the seal for smooth installation;
4. When installing the static ring gland, the tightening screws must be evenly stressed to ensure the vertical requirements of the static ring end face and the axis line;
5. After installation, turn the shaft by hand, and the shaft should not feel heavy;
6. After installation, push the moving ring by hand, so that the moving ring can move flexibly on the shaft and has a certain elasticity;
7. The equipment must be filled with medium before operation to prevent dry friction and seal failure;
8. During installation, a layer of clean mechanical oil should be applied to the surface in contact with the seal. Special attention should be paid to the selection of mechanical oil.
9. Different auxiliary sealing materials can avoid O-rings invading oil and expanding or accelerating aging, resulting in premature failure of the seal;
10. The radial runout of the shaft or bushing, and the runout tolerance of the seal cavity end facing the shaft surface should be in line with the relevant specifications; 11. By taking measures such as blocking, flushing, cooling and filtering The temperature of the conveying medium is effectively controlled;
12. When installing a spring-driven mechanical seal, the direction of rotation of the shaft should be maintained to make the spring tighter and tighter.