A variable channel anti-hammer air valve and its design method

Abstract

The invention relates to a variable channel anti-hammer air valve and a design method, comprising a valve body with inlet and outlet ports on the top, ball valve seats and floating balls below the inlet and outlet ports, and at least one valve body that can Opened swing check valve, the swing check valve includes: a swing valve clack hingedly connected with the valve body, a variable flow path inlet controlled by the swing valve clack to limit the swing Type disc opening facilities, sealing facilities. The invention utilizes the air valve to take in air through the intake and exhaust ports and the variable channel during intake, and only exhausts through the intake and exhaust ports during exhaust, changing the area of ​​the intake and exhaust channels, thereby realizing rapid air intake and The slow exhaust avoids the force of the throttle ring and the uncertainty of the closing process caused by the strong three-dimensional characteristics of the exhaust process, and also solves the problem of instability of the spring force. The air valve can be set with arbitrary inflow area and outflow area according to the numerical simulation results, so as to conveniently meet the design requirements.

Description

technical field [0001] The present invention relates to a variable channel anti-hammer air valve and its design method, which is a kind of water hammer protection equipment and usage method of the pipeline system and a method of designing the protection equipment, and is a long-distance diversion of water or urban water supply and drainage. Equipment and methods for protection of hydraulic transition process of engineering pressure water pipelines. Background technique [0002] The uneven distribution of time and space or the shortage of resources are the current situation of my country's water resources and the constraints of economic and social development in some areas. Long-distance water diversion projects are the most common engineering measures to optimize the allocation of water resources. Water diversion projects usually use open channels, pipelines, tunnels, box culverts, etc. for water transmission and distribution. Among them, pipeline water transmission is less ...

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Problems solved by technology

This scheme is completely feasible in theory, but the following problems may arise during its design and use: ① The boundary conditions of computational fluid dynamics analysis (such as pressure inlet, flow velocity inlet or pressure outlet) are uniform, and the air The suction and exhaust of the valve have strong three-dimensional characteristics. Therefore, the force on the throttle ring is uneven, and the thrust and frictional resistance are different from the design value. Whether the throttle ring can be closed at the design wind speed or exhaust volume remains to be seen. further research

②The airflow thrust in a limited space is affected by many factors such as the flow channel structure and the throttle ring opening, so it is difficult to accurately determine its value; on the other hand, the spring force is affected by the spring wire material, spring wire diameter, spring diameter, Influenced by various factors such as the height of the spring and the number of coils, the constancy and consistency of the elastic coefficient is also a difficult problem for designers and manufacturers.

③At this stage, there is no air valve that uses a large flow path for air intake and immediately uses a small flow path for exhaust

To achieve this goal, the common practice is to use a vacuum breaker valve and a small-diameter intake and exhaust air valve. This not only requires high equipment and installation costs, but also brings certain troubles to land acquisition and operation and maintenance. It is a problem that needs to be solved. The problem

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