2results about How to "Avoid direct soldering" patented technology

The utility model provides a built-in efficient heat exchanger which comprises a heat exchange shell for storing a refrigerant and a heat exchange pipe for medium circulation and heat exchange, the heat exchange shell is provided with a heat exchange inner cavity, the heat exchange pipe is installed in the heat exchange inner cavity, the heat exchange shell is provided with a built-in integrated pipe set, the built-in integrated pipe set comprises an integrated liquid inlet pipe and an integrated liquid outlet pipe, and the integrated liquid inlet pipe is connected with the integrated liquid outlet pipe. The inner connecting end of the integrated liquid inlet pipe and the inner connecting end of the integrated liquid outlet pipe are connected to the heat exchange shell and extend to the heat exchange inner cavity, and the liquid inlet end and the liquid outlet end of the heat exchange pipe communicate with the integrated liquid inlet pipe and the integrated liquid outlet pipe in an integrated mode. The structure is simple, the heat exchange tubes made of different materials are effectively prevented from being directly welded on the heat exchange shell, and the pressure resistance of the product is improved; meanwhile, effective utilization pipe sections of the heat exchange pipes are increased, the heat exchange capacity of the heat exchanger is improved, and the product manufacturing cost is reduced.

This invention provides a welding device for foundation pit retaining construction, relating to the field of foundation pit reinforcement mesh welding technology. It includes a welding clamp with a welding section mounted on it. The welding section is used to improve the lap joint accuracy of the reinforcing bar ends. A vertical reinforcement limiting component is mounted on the welding section, which limits the spacing of the vertical reinforcement bars. An anti-bending support is mounted on the welding clamp. A lower weld protection component is mounted on the welding section. Welding guides are mounted on the welding clamp and the welding section. This addresses the problems of current foundation pit retaining construction welding devices, which make it inconvenient for workers to first clamp the horizontal reinforcing bar ends before performing double-sided welding, and also make it inconvenient to check the lap joint accuracy of the horizontal reinforcing bar ends.