Single-end-face built-in-type mechanical seal for centrifugal pump

Abstract

The invention provides a single-end-face built-in-type mechanical seal for a centrifugal pump. A retaining ring is arranged between a static ring and a cooling water sealing ring, a cooling water flowcavity is divided into two zones of the high pressure zone and the low pressure zone through the retaining ring, the static ring is located in the high pressure zone, the cooling water sealing ring is located in the low pressure zone, and the bottom end of the retaining ring gets close to a shaft sleeve to form an overflowing clearance. According to the single-end-face built-in-type mechanical seal for the centrifugal pump, external leakage of cooling water can be prevented through slight changing on the basis of the built-in-type mechanical seal of the pump, the service life of the cooling water sealing ring is prolonged, and the production cost does not need to be increased; and the cooling water can be saved by 50-80% by changing the hole diameter of a cooling water in-out opening, andthe great water-saving effect is achieved.

Description

technical field [0001] The invention relates to the mechanical industry, in particular to a single-end built-in mechanical seal device. Background technique [0002] Centrifugal pumps are used to transport liquids. The commonly used shaft seals include external mechanical seals and internal mechanical seals. Centrifugal pumps that transport slurry containing particles mostly use built-in mechanical seals with cooling water flushing. However, the rubber ring of the cooling water in the sealing device of the traditional technology is easy to wear and leak. Generally, after 2 to 3 months of use, the seals of the moving ring and the static ring at the front end are still intact, but the rubber sealing ring sealing the cooling water is worn and leaks the cooling water. Liquid, there is the leakage of cooling water for flushing the seal and the shortcomings of large cooling water consumption, which does not meet the requirements of environmental protection and water saving. The r...

AI Technical Summary

Problems solved by technology

However, the rubber ring of the cooling water in the sealing device of the traditional technology is easy to wear and leak. Generally, after 2 to 3 months of use, the seals of the moving ring and the static ring at the front end are still intact, but the rubber sealing ring sealing the cooling water is worn and leaks the cooling water. Liquid, there is the leakage of cooling water for flushing the seal and the shortcomings of large cooling water consumption, which does not meet the requirements of environmental protection and water saving. The reasons for the above problems are: 1. The high pressure of cooling water makes the lip of the rubber sealing ring Enclose the shaft sleeve, and the wear is accelerated; 2. The rubber sealing ring in the sealing box is at a linear speed of about 5 m / s, and the natural use time is only 4 to 6 months. The life of the ring does not match the life of the cooling water sealing ring, and the life of the cooling water sealing ring is only one-third of the life of the mechanical seal), so this kind of mechanical seal is very inconvenient to use, but there is no substitute for a long-lasting anti-corrosion mechanical seal , so far this issue has not been resolved

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