An automatic dynamic balance structure for axial force of hot water circulating pump

Abstract

The invention discloses an automatic dynamic axial force balancing structure of a hot water circulating pump. An impeller on a spindle moves to increase or decrease a gap between a right-angle balancing plate and a balancing plate sleeve so as to adjust average pressure in a cavity of a rear cover plate of the impeller and average pressure in a leakage passage of the balancing plate, so that action force on the rear cover plate of the impeller can be changed to be equal to that on a front cover plate of the impeller, and no matter how action force on the front and rear cover plates changes, generated axial force can balance, and axial force of the impeller can be automatically dynamically balanced. The automatic dynamic axial force balancing structure in the technical scheme can completely balance axial force generated by the impeller, is simple and reliable in structure, and is of great significance in developing safe, reliable and long-life hot water circulating pumps, and service life of a bearing is greatly prolonged.

Description

technical field [0001] The invention relates to the technical field of pumps, in particular to an automatic dynamic balance structure for axial force of a hot water circulation pump. Background technique [0002] In industries such as metallurgy, electric power, light textile, petroleum, chemical industry, chemical fertilizer, pharmaceutical, papermaking, environmental protection, rubber, heating, waste heat utilization and nuclear energy, hot water circulating pumps for transporting heat medium will be used. Since the hot water circulating pump transports high-temperature medium, the temperature of the medium is generally higher than 220°C, and the high-temperature medium will transfer heat to the pump, causing the overall temperature of the pump to rise above 220°C, which also affects the components of the pump. The working environment has a certain impact on the safe operation of the pump. In particular, it has a great influence on the reliable operation of the shaft sea...

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Problems solved by technology

[0004] The large axial force generated by the impeller of the ordinary hot water circulating pump during the rotation process is borne by the bearing, which will cause the heat generated by the bearing to increase, and the temperature of the bearing will increase. In addition, the temperature of the medium transported by the hot water circulating pump is high. , and cause the ambient temperature of the bearing to be high. In this way, it is easy to make the working temperature of the bearing exceed the allowable value, which affects the service life of the bearing, thereby affecting the reliability of the hot water circulating pump. In order to improve the reliability of the hot water circulating pump, reduce The temperature of the bearing is a must. Improve the current axial force balance method of the hot water circulating pump so that it does not act on the bearing at all, greatly reducing the force on the bearing, thereby reducing the temperature of the bearing and increasing the service life of the bearing.

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