China Institute of Water Resources and Hydropower Research

China Three Gorges Corporation

Jiajia Pan

Tao Wang

Xinlei Guo

Hui Fu

Yongxin Guo

Jiazhen Li

Hao Wang

Huichao Dai

Hanqing Zhao

Ping Ji

Jinzhi Lu

The present invention relates to a variable-flow-path air valve for water hammer prevention and a design method. The variable-flow-path air valve includes a valve body with a top provided with an air intake-exhaust port. A ball valve seat and a floating ball are arranged below the air intake-exhaust port. The valve body is provided with at least one swing check valve configured to be opened inward. The swing check valve includes: a swing valve disc connected to a valve body hinge, a variable-flow-path air inlet controlled by the swing valve disc to open and close, a device for limiting the opening degree of the swing valve disc, and a sealing device. In the present invention, the air valve takes in air through the air intake-exhaust port and the variable flow path, and discharges air only through the air intake-exhaust port.

Variable-flow-path air valve for water hammer prevention and a design method

The invention relates to a device and method for laboratory ice jam and ice dam radar measurement tests, the device includes a non-metal water tank, a truss spans the top of the non-metal water tank, the truss is connected with a radar plate parallel to a surface of water through a lifting mechanism, a measuring radar is provided on the radar plate, a permeable measuring barrel soaked in the water is provided below the radar plate, a barrel bottom of the permeable measuring barrel is a permeable plate capable of rising and falling, model ice blocks are provided in the permeable measuring barrel, and a handle capable of shaking the truss upwards, downwards, leftwards and rightwards is provided on the truss. According to the invention, through establishing simulated ice jam and ice dam in the permeable measuring barrel, the formation and characteristics of the ice jam and the ice dam are tested, and systematic research can be carried out to address the difficulties, such as radar echo images and the dielectric constant, in the radar measurement of the ice jam and the ice dam and a water depth underneath the ice, so that the measurement accuracy of corresponding equipment is improved, and further development of related disciplines is promoted. A whole set of the device is simple in structure, low in cost, and facilitated and effective in the implementation of tests.

Device and method for laboratory ice jam and ice dam radar measurement tests

Growing community of inventors

Beijing, China

Jiajia Pan