6results about How to "Cases to prevent backflow" patented technology

The utility model relates to the technical field of grouting pipelines, and discloses a backflow prevention device for a post-grouting pipeline, which comprises a pipe body, a grouting port is arranged at the upper end of the pipe body, a grout outlet is arranged at the lower end of the outer wall of the pipe body, a moving block is slidably connected to the lower end of the inner wall of the pipe body, and a circular groove is arranged at the bottom of the moving block. The top of the inner wall of the circular groove is fixedly connected with a spring, the lower end of the spring is fixedly connected with the bottom of the inner wall of the pipe body, and the top of the moving block is fixedly connected with a connecting block. According to the backflow preventing device for the post-grouting pipeline, when grouting is stopped, the moving block can move upwards under the action of the spring, the moving block drives the baffle to move upwards through the connecting block while moving upwards, and through the arrangement, the backflow preventing device has the advantages that after grouting of the grouting pipeline is stopped, the baffle can move to the position above a grout outlet under the action of the spring, and therefore the backflow preventing effect is achieved. Therefore, a good sealing effect on the grouting pipeline is achieved, the situation that cement grout flows back is effectively prevented, the backflow control efficiency is high, and the cost is low.

The utility model discloses a novel transmission shaft universal joint capable of preventing oil leakage, which relates to the field of transmission shaft universal joints and comprises a shaft body, a plurality of shaft necks are symmetrically arranged on the outer wall of the shaft body, sleeves are sleeved on the outer walls of the shaft necks, an oil groove is arranged in the shaft body, and oil conveying pipes communicated with the oil groove are arranged in the shaft necks. Oil absorption cotton is arranged in the sleeve, a punching block is elastically arranged in the oil conveying pipe, and a punching groove for the punching block to slide is formed in the sleeve. Redundant lubricating oil can be absorbed under the action of the oil absorption cotton, the situation of leakage caused by accumulation of the lubricating oil is prevented, the punching block is thrown out of the oil conveying pipe through the centrifugal force of the punching block when the shaft body rotates, the lubricating oil in the oil absorption cotton is extruded out to lubricate the roller pin again, the roller pin is reused, and the service life of the roller pin is prolonged. Meanwhile, when the shaft body stops moving, the oil conveying pipe is blocked by the punching block through the reset acting force of the elastic assembly, and the situation that lubricating oil flows back is effectively prevented.

The utility model discloses an ion exchanger which comprises a tank body, an ion exchange layer is arranged in the tank body, a first liquid inlet is formed in the upper part of the tank body, an upper water distribution plate positioned above the ion exchange layer is arranged in the tank body, and a group of upper water distribution holes are formed in the upper water distribution plate; a second liquid inlet is formed in the lower part of the tank body, a lower water distribution plate located below the ion exchange layer is arranged in the tank body, a group of lower water distribution holes are formed in the lower water distribution plate, a drainage pipe is further arranged on the tank body, part of the drainage pipe is located in the ion exchange layer, and one end of the drainage pipe extends out of the tank body; a liquid collecting hole for enabling liquid to enter the drainage pipe is formed in the part, located in the ion exchange layer, of the drainage pipe. The first liquid inlet and the second liquid inlet are arranged, so that liquid inlet channels can be increased, the treatment efficiency can be improved, meanwhile, the upper water distribution plate and the lower water distribution plate are arranged, inlet water can be uniformly distributed to different positions of the ion exchange layer, and all parts of the ion exchange layer can fully play a role.

This utility model discloses a dual-condition cooling and heating integrated device for a feed pump, relating to the field of dual-condition feed pump technology. It includes a base, an electrical box, a material box, a storage box, a dual-condition feed pump, a cooling assembly, a cooling mechanism, a heating mechanism, and a material extraction mechanism. The bottom of the dual-condition feed pump is fixedly connected to the top of the base near the rear side of the electrical box. A material extraction pipe is fixedly connected to the output end of the dual-condition feed pump, and a feed pipe is fixedly connected to the input end of the dual-condition feed pump. A diversion pipe is fixedly connected to the outer wall of the feed pipe near the left side of the cooling assembly, and a one-way valve is provided on the outer wall of the feed pipe near the right side of the diversion pipe. This utility model, by operating the dual-condition feed pump, can cool the conveyed material when the temperature is high through the cooling assembly and cooling mechanism, and heat the material when the temperature is low by conveying it through the diversion pipe via the extraction pipe and then heating it through the heating mechanism.

The utility model discloses an industrial gas filling monitoring device which comprises a filling tank body, a data receiving unit used for receiving monitoring data in the gas filling process and a filling connector fixed to the top of the filling tank body. A connecting assembly is arranged at the top of the filling joint; by arranging the connecting assembly at the top of the filling connector, when the external inflation head needs to be in butt joint with the filling connector for industrial gas filling, the external inflation head and the filling connector are in threaded connection to the two ends of the connecting sleeve through cooperation of butt joint grooves in the top and the bottom of the connecting sleeve, and mounting or dismounting is easy and convenient; compared with flange connection, the manufacturing cost is low, through the arrangement of the one-way valve, when the external inflation head inflates the filling tank body through the connecting sleeve, the situation of gas backflow can be prevented, data monitoring can be conducted in the gas filling process through cooperation of the sensing assembly and the data receiving unit, and the reliability of gas filling is improved. And the visibility and the safety in the industrial gas filling process are improved.

The present application belongs to the technical field of check valve, especially relates to a rocker arm type anti-backflow high-efficiency check valve, which comprises a valve body, the valve body is fixedly connected with a rocker arm frame through a screw, the lower end of the rocker arm frame is rotatably connected with a rocker arm through a pin shaft, the rocker arm is fixedly installed with a valve clack assembly, the front end of the valve clack assembly abuts against a valve seat arranged in the valve body, the valve clack assembly stores a counterweight liquid, a counterweight adjusting assembly is arranged at the rotatable connection position of the pin shaft and the rocker arm, when fluid flows through the check valve in a forward direction, the counterweight liquid stored in the valve clack assembly is transferred into the pin shaft through the counterweight adjusting assembly, the weight of the valve clack assembly is reduced, the resistance to fluid is reduced, and the fluid can flow through the check valve quickly, when the fluid stops flowing through the check valve, the counterweight adjusting assembly transfers the counterweight liquid in the pin shaft back into the valve clack assembly, thereby increasing the weight of the lower end of the valve clack assembly, the valve clack assembly is tightly pressed against the valve seat, and the backflow of fluid is effectively prevented.