5results about How to "Avoid back pressure" patented technology

The invention relates to a low-temperature propellant filling system for a rocket core-level power system test. The low-temperature propellant filling system comprises a propellant supply subsystem, a ground pipeline precooling and discharging subsystem, a filling port discharging subsystem and a filling port deflating subsystem. The propellant supply subsystem is connected with the rocket body storage tank through a propellant supply pipeline of the propellant supply subsystem, and low-temperature propellant filling can be achieved; the ground pipeline pre-cooling discharge subsystem, the filling port discharge subsystem and the filling port deflation subsystem are respectively and independently connected with a propellant supply pipeline; and the connecting points of the filling port discharge subsystem and the filling port deflation subsystem on the propellant supply pipeline are respectively positioned on the propellant supply pipeline between the ground pipeline pre-cooling discharge subsystem and the rocket body storage tank. The device can prevent a large amount of low-temperature steam from entering the storage box to cause back pressure in the ground filling process, can adapt to impact vibration in the rocket body filling deformation and test ignition stage, and completes remote control to safely discharge the residual propellant of the rocket body, so that the filling index is met.

The invention relates to a supporting assembly of a propellant supply system and a filling system provided with the supporting assembly. The supporting assembly comprises a fixed support, a sliding hinge support and a vertical adjustable support. The fixed bracket is fixedly arranged at the tail end of the propellant supply pipeline so as to limit displacement caused by low-temperature deformation; the sliding hinge support is arranged in the middle of the connecting hose to support the connecting hose. The vertical adjustable support is arranged at the end, connected with the rocket body storage box, of the connecting hose and can move on the vertical adjustable support in the vertical direction. The device can adapt to impact vibration in the rocket body filling deformation and test ignition stage, and remote control over safe release of the residual propellant of the rocket body is completed.

The utility model relates to the technical field of dredging of a pressure guide pipe on a pressure pipeline, and particularly discloses a dredging and on-line pressure measuring device for a pressure guide pipe of a pressure detection meter on the pressure pipeline, the pressure guide pipe is arranged on the side wall of the pressure pipeline, and the device is arranged on an instrument panel fixing seat on the pressure guide pipe. The device comprises a connecting piece, an oil cylinder barrel, a puncture assembly and a control unit, the lower portion of the connecting piece is connected with an instrument panel fixing base, the upper portion of the connecting piece is connected with the oil cylinder barrel, a piston rod is arranged in the oil cylinder barrel, a channel is formed in the piston rod, and a first through hole communicated with the channel is formed in the side wall of the piston rod; the puncture assembly comprises a pipe body, a plurality of gas pipelines and a puncture head which are sequentially arranged from top to bottom, the pipe body is fixedly arranged at the bottom of the piston rod, and an inner cavity of the pipe body is communicated with the channel. According to the device, the piston rod in the oil cylinder barrel is controlled to move downwards through the oil cylinder, so that the puncture assembly is driven to move downwards and extend into the pressure guiding pipe, and scales or scabs at the communication position of the pressure guiding pipe and the pressure pipeline are punctured.

The invention discloses a tool type detachable and turnover horizontal bearing structure, and relates to the field of horizontal bearing structures, the tool type detachable and turnover horizontal bearing structure comprises at least one bearing assembly, each bearing assembly comprises four six-way joints, a connecting rod is connected between every two adjacent six-way joints, and a rectangular supporting frame is defined by the four six-way joints and the connecting rods; pull rings are arranged at the bent positions of the six-way connectors, one or two steel rope assemblies are arranged in the bearing assembly, and the two ends of each steel rope assembly are connected to the two six-way connectors located on the diagonal lines of the rectangular supporting frame respectively. The device can be rapidly and conveniently assembled and disassembled, can be rapidly adjusted and installed according to the needed size, and is wider in application range. The height of the telescopic base can be rapidly and conveniently adjusted, and the telescopic base can be effectively prevented from being reversely pressed when the weight is heavy through the multiple rotary supporting rods. The sliding assembly of the device can quickly and conveniently adjust the position of each bearing assembly, and the use efficiency is improved.

This utility model provides an explosion-proof three-way valve water device, including: a water distribution tank and an explosion-proof three-way component. The explosion-proof three-way component includes a sealing nozzle and an external guide plate. The sealing nozzle is provided in three sets, and the inner side of the lower end of the three sets of sealing nozzles is interconnected with a main flow pipe and welded and fixed. The three sets of sealing nozzles are arranged in a triangular structure when viewed from above. Each set of sealing nozzles has a set of reinforcing seats at the lower end to improve water pressure resistance and prevent bursting. Compared with the prior art, this utility model has the following beneficial effects: the water distribution tanks arranged in a straight line receive water from multiple channels, the trapezoidal guide hood guides the converging water to the central guide pipe, when the water flows through the explosion-proof three-way component, the motor drives the internal threaded guide vane to rotate and divide the flow, the external guide plate enhances the guiding efficiency, and the reinforcing seat and the sealing shell work together to ensure high-pressure explosion-proof performance. The outer frame provides overall support stability, thereby reducing pressure deviation caused by device shaking.