Cooling of the basic process of the mechanical seal system function-

Cooling of the basic function of mechanical seal system

　2019-06-19　　

Cooling of the basic function of the mechanical seal system:

The purpose of cooling is to quickly remove heat and reduce the temperature of the sealed working environment. Cooling methods include direct cooling and indirect cooling. Flushing and back cooling belong to direct cooling. Sand mill mechanical seal

In mechanical seals, indirect cooling is less effective than direct cooling. But the advantage is that indirect cooling does not have high requirements for the cooling liquid, the cooling liquid does not contact the sealed medium, and will not be contaminated by the medium, and can be recycled. At the same time, indirect cooling can be used in conjunction with other cooling measures to achieve comprehensive cooling. The indirect cooling method (Figure 6-22) includes jacket cooling and heat exchanger cooling, and the cooling medium includes water, steam and air. The jacket cooling has a shaft seal box jacket, a gland jacket, a static ring jacket, a bottom ring jacket and a shaft sleeve jacket. The heat exchanger is cooled with a shaft seal box built-in heat exchanger, an external heat exchanger, a snake (coil) tube cooler, a double-pipe cooler, a fin cooler, and an evaporative heat exchanger for water-deficient areas.

The coiled tube cooler for mechanical seal has external type and built-in type as shown in Figure 6-23. Figure (a) is an external coiled tube cooler. The cooling process is: the sealed medium is transferred to the outside through the inner coil. After the coil is cooled to the required temperature, it is led out of the cooler to the shaft seal box. The cooling water enters the people along the outer wall space first, and then leads out from the intermediate space. Figure (b) shows a built-in coiled tube cooler, which is equipped with a cooler coiled tube in the sealed cavity.

Figure 6-23 Coil cooler for mechanical seal

The main technical specifications of some coiled tube coolers for mechanical seals are shown in Table 6-14. In order to prevent erosion, the flow rate of the coolant should be controlled below 2m/s.

Table 6-14 Main technical specifications of coil coolers for some mechanical seals

The cooling water consumption of the jacket can be determined according to the size of the shaft diameter (reference) When the shaft diameter is less than 100mm, the cooling water flow rate is about 2~3L/min; when the shaft diameter is greater than 100mm, the cooling water flow rate is about 3 -5L/min.　　1097.html,

Back cooling or rapid cooling of the basic process of the mechanical seal system function 　　 Circulating cooling of the basic process of the mechanical seal system function