A check valve of a liquid oxygen-added conveying system and a liquid-oxygen-added conveying system

Abstract

The invention discloses a check valve of a liquid oxygenation conveying system and the liquid oxygenation conveying system. Elastic force of a spring acts on a check valve ball. A vernier can slide up and down along a threaded rod. Pretightening force of the spring can be adjusted according to the position of the vernier. The position of the verniner can be adjusted through rotation of an adjusting nut. Check valve structures are applied to an inlet and an outlet of the hydraulic end of a conveying pump correspondingly. When a piston moves backwards, under the effect of negative pressure of a conveying cavity and spring resilience of an upper check ball valve, the corresponding check valve ball presses a valve base, and sealing is achieved; and meanwhile, the valve ball of a lower check ball valve is opened by overcoming elastic force of the spring under external dissolved oxygen water pressure and negative pressure of the conveying cavity, dissolved oxygen water enters the conveying cavity, and the suction process is completed. When the piston moves forwards and applies work, the valve ball of the lower check valve presses the valve base to achieve sealing under elastic force of the spring and positive pressure of the conveying cavity; and meanwhile, the valve ball of the upper check valve is opened by overcoming elastic force of the spring under positive pressure of the conveying cavity, and dissolved oxygen water is conveyed in one way.

Description

technical field [0001] The invention relates to the technical field of a liquid oxygenation delivery system in the electric power industry, in particular to a check valve and a liquid oxygenation delivery system matched with the liquid oxygenation delivery system. Background technique [0002] The conventional pump delivery system uses two check valves, and the purpose of one-way delivery is achieved through the mutual cooperation of the check valves. However, since the take-off height of the valve disc or valve ball of the check valve is the maximum value each time, that is, the fixed value of the structural design, when the delivery flow is small, the take-off height of the valve ball or valve disc is too large, and it cannot fall back and seal in time, resulting in Delivery flow is greater than control value. In addition, the traditional check valve requires the conveying medium to be at normal pressure or negative pressure. For the medium with a certain pressure, since ...

AI Technical Summary

Problems solved by technology

However, since the take-off height of the valve disc or valve ball of the check valve is the maximum value each time, that is, the fixed value of the structural design, when the delivery flow is small, the take-off height of the valve ball or valve disc is too large, and it cannot fall back and seal in time, resulting in Delivery flow is greater than the control value

In addition, the traditional check valve requires the delivery medium to be under normal pressure or negative pressure. For the medium with a certain pressure, since the check valve at the pump inlet has no restrictions, there will be self-flow phenomenon, which will affect the accuracy of delivery.

In the liquid oxygen addition system of electric power units, due to the daily changes in the load of electric power units, the requirement for precise control of dissolved oxygen value is getting higher and higher, and the delivery rate of dissolved oxygen water is the main variable to control the dissolved oxygen value of feed water, and its own With a certain pressure, if the transfer pump adopts the traditional check valve structure, it will increase the flow interference factor caused by the take-off height of the valve ball, which is not conducive to the precise control of the dissolved oxygen value by adding oxygen in liquid state

[0003] Although the traditional spring-type check valve has a spring limit for the valve ball, the spring force is a fixed constant, and it cannot be adjusted according to the actual situation when the pressure level of the conveying medium changes.

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