31results about How to "Avoid repair work" patented technology

The invention relates to a heat exchanger diagnosis method. Among them, the primary side mass flow of the flow medium flowing through the heat exchanger (8, 18) is regulated by the regulating valve (6, 16), which is controlled by the process controller (4, 14), wherein the process controller Valve position values ​​for regulator valves (6,16) provided by (4,14) are obtained and stored. The invention is characterized in that the valve position values ​​for the control valves (6, 16) are recorded during the recording period, so that in at least one measurement sequence the valve position values ​​assigned to a periodic observation period are stored, wherein the observation period reflects the same period of one year, and when the deviation of the stored measured value from the reference value assigned to the measurement sequence is greater than a predetermined deviation from the reference value, by analyzing the at least The position value of a sequence of measurement results is used to diagnose the degree of fouling of the heat exchanger (8,18).

The invention discloses a high-voltage frequency converter with a safety protection structure and a working method thereof. The main body of the high-voltage frequency converter, the bottom side of the protective box is provided with a glide groove, the inside of the glide groove is connected with a reciprocating screw rod for rotation, and the bottom side of the protective box is equipped with a geared motor connected to the reciprocating screw rod , the reciprocating screw rod is meshed with a slider that slides inside the chute, the slider is fixed at the corner of the bottom side of the door, and an electronic lock is installed at the center of one side of the protective box. The invention has a novel structure and an ingenious concept, which can not only prevent workers from accidental electric shock, but also prevent workers from performing maintenance work while the high-voltage frequency converter body is charged, thereby greatly improving the safety of use.

The invention discloses a lossless welding connector for a long-distance pipeline steel pipe with an internal coating. The lossless welding connector comprises a flaring welding connector and a necking-down welding connector which are in inserted welding with each other. The two welding connectors are provided with end walls with a certain thicknesses, the inside of the flaring welding connector and the top of the end wall of the necking-down welding connector are provided with leading-in grooves in inserted matching, the top of the end wall of the flaring welding connector and an outer wall of the necking-down welding connector are provided with welding grooves matched with each other, and the flaring welding connector is provided with an injection port and an overflow port. The welding connector does not reduce the diameter of a pipeline, the heat conduction characteristics of the pipeline are utilized, the temperature of a pipe body is reduced by circulation of a heat exchange carrier in the pipeline, the anti-corrosive internal coating is protected, and lossless welding is achieved.

The invention discloses a water-sand separation building applicable to a linear chute spillway. The water-sand separation building mainly comprises a sand collection pool of which the upstream end is connected with an incoming flow spillway, and a flow pass channel and a sand discharge channel which are positioned at the downstream part of the sand collection pool and are arranged side by side, wherein an inlet of the sand discharge channel is in smooth connection with the sand collection pool; the flow pass channel is connected with the sand collection pool through an overflow weir; the water attaining surface of the overflow weir is an circular arc surface, and forms a sand guide wall used for introducing large-particle and granular sediment in a water current into the sand discharge channel; the upstream end of the circular arc surface of the sand guide wall is connected with the side wall on the outer side of the flow pass channel; the downstream end of the circular arc surface of the sand guide wall is connected with a separation side wall of the flow pass channel and the sand discharge channel; and the pool bottom of the sand collection pool in front of the sand guide wall has a gradient inclined to the inlet of the sand discharge channel. Through the adoption of the water-sand separation building, the large-particle and granular sediment in a high-sand content water current in a chute can be separated from the water current relatively well, the sediment which has relatively large harm to the chute spillway is discharged from the special sand discharge channel, and the purposes that the protection range is decreased and the safety of project operation is improved are achieved.

The invention discloses an arrangement form of water-sand separation buildings suitable for a steep trough spillway in a curve, which comprises a sand collection tank whose upstream end is connected with the spillway of the incoming flow and a steep trough spillway located in the downstream of the sand collection tank. The steep trough spillway is composed of a flow channel and a sand discharge channel arranged in parallel. The inlet bottom plate of the sand discharge channel is smoothly connected with the bottom plate of the sand collection tank. The inwardly inclined continuous floor with low wall side; the overflow channel connects with the sand collection tank through the overflow weir, and the flow channel floor of the bend section of the overflow channel is a stepped structure floor; the overflow surface of the overflow weir is a circular arc surface, which constitutes a sand guide wall that guides large particles and granular sediment in the water flow into the sand discharge channel. The invention can effectively realize the separation of granular sediment and water flow in high-velocity and high-sand content water flow, and can achieve the purposes of safe sand discharge, reduction of protection range, reduction of maintenance cost and improvement of project operation safety and the like.