4results about How to "No reflux" patented technology

The utility model discloses a device for measuring sound velocity in a middle-high pressure hydraulic pipeline, which relates to the technical field of measuring devices and comprises a driving shaft, a rotary valve, a transition end cover, a hydraulic pipeline, a first fiber bragg grating sensor and a second fiber bragg grating sensor. An axial output port of the rotary valve is connected with a transition end cover, and the transition end cover is connected with a hydraulic pipeline; the front end of the hydraulic pipeline is connected with a first fiber grating sensor, and the tail end is connected with a second fiber grating sensor; the rotary valve comprises a valve cover, a valve body, and a rotary valve core and a bearing which are arranged in the valve body; the driving shaft is connected with the rotary valve element, and an explosion flushing cavity and a low-pressure cavity which are isolated from each other are formed in the rotary valve element; the blasting cavity is provided with a first conical nozzle, and the low-pressure cavity is provided with a second conical nozzle; an axial output port of the rotary valve is provided with a third conical nozzle; the transition end cover is provided with a fourth conical nozzle; measurement of the propagation sound velocity of oil in a hydraulic pipeline under a certain pressure is realized.

The invention belongs to the technical field of side slope drainage, and particularly relates to a road shoulder and side slope collaborative drainage system based on concrete precast blocks, which comprises a roadbed, a side slope positioned on the roadbed, a road shoulder positioned at the top of the side slope, and a drainage ditch positioned at the bottom of the side slope, net-shaped frame units and torrent groove units are arranged on the slope surface of the side slope at intervals, and the torrent groove units penetrate through the slope top to the slope bottom; the net-shaped frame unit is fixed on a slope surface through an anchoring part and is connected with the torrent groove unit; the drainage ditch is formed by connecting a plurality of groove units; compared with the prior art, the construction difficulty is reduced through modular components, the construction efficiency is improved, and meanwhile peak regulation and storage and ecological maintenance can be achieved.

The utility model discloses an exhaust mechanism of a semiconductor plastic package mold, which belongs to the field of semiconductor plastic package molds, and comprises a body mechanism, a sealing mechanism is mounted at the outer end of the body mechanism, a positioning mechanism is mounted at the upper end of the body mechanism, the sealing mechanism comprises a sealing ring, and the sealing ring is connected with the positioning mechanism. The outer end of the sealing ring is movably connected with a connecting ring, clamping frames are installed at the outer end of the sealing ring, the clamping frames are symmetrically distributed, and each clamping frame is of an L-shaped structure. When the extraction base is installed, the extraction base and the sealing ring are assembled to form a sealing structure, the clamping frame is pressed in a matched mode to enable the clamping head to be connected with the clamping groove, the sealing ring and the extraction base can be stably connected, and the sealing function can effectively prevent external pollutants from entering the mold due to structure falling; and the sealing design can improve the exhaust efficiency, ensure that the gas can be smoothly exhausted without backflow, and improve the exhaust effect of the exhaust mechanism of the semiconductor plastic package mold.

This utility model relates to the technical field of waste gas sampling devices, specifically, to a sulfur-containing waste gas sampling device. It includes a suction and storage cylinder for suction sampling operations. A threaded tube is fixedly installed at the inlet end of the suction and storage cylinder. A first external connecting pipe is detachably installed at the end of the threaded tube. A second external connecting pipe is detachably installed at the end of the first external connecting pipe. A gooseneck tube is detachably installed at the end of the second external connecting pipe. The suction and storage cylinder includes a cylinder body. The threaded tube is fixedly installed on the cylinder body. A connecting rod is slidably connected inside the cylinder body. A piston located inside the cylinder body and slidably connected to the cylinder body is fixedly installed at the bottom end of the connecting rod. This utility model facilitates sampling operations and improves the convenience and mobility of sampling work.