The various self-cleaning with cleaning fluid at high temperature on the seal

As a guiding principle, the following circumstances and conditions of use need to set the cooling jacket or coil: 1. That both dilution and flushing the cooling function of media leaks. The so-called direct liquid cooling is the cooling and sealing face direct contact with the purpose to achieve cooling. a radial axis washing Rinse: Rinse the vertical radial fluid sealing friction pairs, simple structure, is more a way of application. Wash cutting INaP circle to the sealing surface temperature becomes uniform, have reduced the erosion of the graphite ring, the method is recommended.According to the type of pressure can be self-cleaning in two ways: One is the use of pump pressure to achieve their own wash; the other is in a sealed chamber through the booster, to seal fluid circulation. In order to avoid erosion of graphite ring, radial fluid flow into the sealed chamber not higher than 3m / s, the hole diameter not less than washing 5mm.. all to wash; c. By sealing the fluid flow direction can be divided into forward flush, reverse flush, wash and run through to rinse the two. Axial flushing: the axial sealing fluid into the sealed chamber, avoiding the erosion of the graphite ring the role of the pump can be used in corrosive media.

 Reverse flushing is the limit from the sealed chamber through the entrance orifice to the pump. Cleaning fluid for high temperature, then with cooling with self-flushing. F), unless using a metal bellows mechanical seals; 2. This approach is used in sealing the low boiling point liquid. Single point of washing: washing liquid from a spout seal flush, can be divided into radial, axial and tangential in three ways: a. Single flush can not be directly aligned graphite ring (static part), we can not cut away from the friction, so that washing was decreased. More washing: washing fluid over small holes along the circumference at the same time to enter the sealed chamber, and from a flushing effect. F): 3. Boiler feed pump; 4. Requirements in the impeller and the sealing gap between the lower end sets. Pumping temperature exceeds 315 ℃ (600. However, more complex structure required to add a wash ring, equipped with 6 to 8 holes, aperture 3 ~ 4mm. Can not be recycled cooling water, cooling let go. But the flushing volume is not too large, to prevent the graphite ring out of the gap. Low flash point liquid;

Through the wash: washing fluid from the pump outlet into the sealed chamber by the orifice in the flow of the pump after washing the entrance. Wash more easily used in the vaporization of the medium, can also be used in the production of high friction heat pv value more occasions. Single seal for the interior, as to be sealed when not suitable for sealing fluid, such as to be sealed with solid particles (such as oil refinery catalytic cracking unit in the pump) or high temperature, high viscosity (such as atmospheric and vacuum distillation refinery devices in the tower bottom pump), be sealed from the outside into fluid (gas oil and diesel oil refinery common), injected into the sealed chamber, to improve the sealing of the working environment. Cooling can be divided into direct and indirect cooling in two ways. Did not wash the seal; 5. This approach is used in washing with a self-cooling. Pumping temperature exceeds 149 ℃ (300. It is through the pumping device to discharge fluid from the sealed chamber, through the limiting orifice and cooler, then into the sealed chamber temperature decreased, if the dirty fluid in the pipe can be increased since no one will be washed, also known as for the inner loop. a radial wash; b. Booster may be a small impeller, vortex impeller and pumping spiral so. . Being washed from the pump outlet through the limiting orifice to the seal cavity. Must control the volume of this rinse. For high-temperature single-seal pumps, easy to crystal or solid particles and the corrosive medium with the pump, can be washed by injection. Cooling is the temperature control an important part of the facilities, is often taken to an auxiliary facilities. High melting point products (heating). Single point of washing is simple, uniform temperature distribution around the seal.

Pump can be used for dual-bearing two to wash, sealed chamber in the outlet pressure higher than the import side, the ends of the sealed chamber connected with the pipeline, the export side of the pump is reverse flush, flush the pump inlet is positive, so that of two to wash. Cut to flush: flush fluid friction along the tangent direction of the Deputy, is the single point of washing in a better way. The timely export of mechanical seals to reduce friction heat and heat to medium impact H plays a significant role. One way is to inject the cooling fluid to the sealed chamber, cooling seal faces, it is obvious this is all about before washing; Another way is to end in the gland through the atmosphere to cool the liquid (usually water), the main static inner cooling ring, the method commonly referred to as "quench" (or back cold). More Sealing Inserts Manufacturers flush to overcome the shortcomings of the single point of washing, so that the temperature distribution around the friction pair is more uniform. American Petroleum Institute;s standards on oil refineries pump (APl610) made provision. Flushing hole in the friction of Deputy Commissioner should be set up to better guide to the heat away. The so-called indirect cooling is liquid cooling and seal faces do not touch, through the cooling water jacket or other methods (such as static cooling loop) to achieve the purpose of cooling. The various self-cleaning with cleaning fluid at high temperature on the seal. Injection flushing was referred to as "wash" Fluid into the sealed cavity in two ways: a single point of flushing and more flushing