Rotary Part Of Customized Metal Bellow Mechanical Seal AS-B237

Background Knowledge：

The necessity of using double(contact and non-contact) bellows mechanical seal for high temperature heavy oil pump

The high-temperature heavy oil pump adopting a contact type bellows mechanical seal is prone to hot oil leakage and fire hazard, resulting in material loss and serious safety hazards. Therefore, the refining and chemical enterprise has developed a double-face seal structure combining a non-contact type mechanical seal using liquid film lubrication with a contact type mechanical seal:The left side is a non-contact bellows mechanical seal, and the right side is a contact bellows mechanical seal. The working principle is as follows: First of all, clean cooling and flushing wax oil is passed through the injection hole on the main gland, and its pressure can be changed within a certain range (0.3~0.5MPa);The contact type mechanical seal on the right is mainly to prevent the flushing wax oil from leaking to the atmosphere in the running state, while the non-contact mechanical seal on the left side can pressurize a small amount of clean wax oil (not more than 5L/h) and pump it into the air.The key to this sealing structure is that the designed non-contact mechanical seal can pressurize the low-pressure wax oil to exceed the pressure of the heavy oil, effectively preventing the heavy oil from entering the vicinity of the mechanical seal.

The double mechanical seal structure solves the problem of frequent leakage of the sealing medium, has good sealing effect, long service life and low end surface temperature, and effectively contains the end face thermal cracking caused by high temperature and the corrosion of naphthenic acid to the seal.In addition, the auxiliary system has a simple structure, less cooling water consumption, good economic benefits, meeting the requirements of long-term safe operation of the device and environmental protection, thus has industrial promotion value.