Variable-flow-channel waterproof hammer air valve and design method

Abstract

The invention relates to a variable-flow-channel waterproof hammer air valve and a design method. The variable-flow-channel waterproof hammer air valve comprises a valve body, wherein an air intake and exhaust port is arranged at the top of the valve body; a ball valve seat and a floating ball are arranged below the air intake and exhaust port; at least one swing check valve that can be opened inward is arranged in the valve body, and comprises a swing valve clack, a variable-flow-channel air intake port, equipment for restricting the opening degree of the swing valve clack, and sealing equipment; the swing valve clack is connected with the valve body in a hinging manner; and the variable-flow-channel air intake port is controlled by the swing valve clack to open and close. The air intakeoperation of the air valve is performed through the air intake and exhaust port as well as a variable flow channel during the air intake process, and the air exhaust operation is performed only through the air intake and exhaust port during the air exhaust process, so that the air intake and exhaust channel area can be changed, and then the quick air intake effect and the slow air exhaust effect can be achieved; the problem that the throttle ring stress and closing process is uncertain due to the strong three-dimensional characteristic of the air exhaust process can be solved; the problem thatthe spring acting force is unstable can also be solved; and the inflow area and the outflow area of the air valve can be set arbitrarily according to the numerical simulation result, thereby meetingthe design requirements conveniently and quickly.

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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