41results about How to "Overcome the defect of poor stability" patented technology

The invention relates to a device for generating foam drilling fluid. The foam drilling fluid generating device specifically includes a foam generating device and a foam mixing device. The foaming chamber of the foam generating device is provided with a stirring rod with a helical stirring blade. The foam generating device is connected with a pressurization system to ensure that the inside of the foaming chamber under high pressure. The mixing device includes a mixing chamber and a mixing rod. The mixing rod has a hollow structure. The mixing rod is provided with helical blades and stirring blades, and small foam outlet holes are designed between the helical blades. The foam gradually enters the mixing chamber from the foam outlet of the foam generating device through the foam outlet hole on the mixing rod of the mixing device, and is evenly mixed with the drilling fluid. Compared with the prior art, the drilling fluid foam produced in the present invention has high foaming ratio, uniform foam shape, good downhole stability and good mixing effect with the drilling fluid base fluid.

The invention discloses a preparation method of a black phosphorus / cobalt tetroxide composite type oxygen evolution electrocatalyst. Cobalt powder is placed in a muffle furnace, and is oxidized in air to obtain cobalt tetroxide; Wet ball milling in organic solvent, centrifugation, alcohol washing and drying to obtain BP / Co 3 O 4 Composite oxygen evolution electrocatalyst, BP / Co disclosed in the present invention 3 O 4 The preparation method of the composite oxygen evolution electrocatalyst is safe and easy to control, with mild synthesis conditions, does not require harsh reaction conditions such as high temperature and high pressure, has the characteristics of convenient process and is conducive to large-scale production, and can be used for large-scale preparation of oxygen evolution electrocatalysts. catalyst.

The invention discloses an automatic press fitting device of a motor rotor bearing. The automatic pressing fitting device comprises a rack and is characterized in that a rotor blanking conveying mechanism, a bearing blanking conveying mechanism, a magnetic ring blanking conveying mechanism and a bearing press fitting mechanism are arranged on the rack; the outlet end of the rotor blanking conveying mechanism, the outlet end of the bearing blanking conveying mechanism and the outlet end of the magnetic ring blanking conveying mechanism correspond to the bearing press fitting mechanism in position; and the automatic press fitting device of the motor rotor bearing is good in press fitting quality and high in stability, and automatic pressing fitting of the bearing on a rotating shaft can be achieved.

The invention discloses a scaffold on the basis of a resistance wall of a coke oven and solves the problems of poor stability, poor safety performance and the like of a scaffold in the prior art. The scaffold on the basis of the resistance wall of the coke oven comprises scaffold main bodies, namely, a first scaffold and a second scaffold, constructed at both sides of the resistance wall of the coke oven; each of the first scaffold and the second scaffold is formed by six rows of uprights which are longitudinally arranged at intervals, transverse across columns which are transversely arranged at intervals and X-shaped support pillars for fastening the uprights and the transverse across columns; horizontal columns connected with the first scaffold and the second scaffold at the same time are arrange at the tops of the first scaffold and the second scaffold; a plurality of opposite-pulling screws connected with the first scaffold and the second scaffold are also arranged between the adjacent sides of the first scaffold and the second scaffold. The scaffold is high in structural intensity of a main body and has high frame stability; perpendicularity is ensured; pouring quality meets the construction requirements.

The invention discloses a method for preparing a micron-order phase-change microemulsion. The method comprises the following steps of: adding a nucleating agent into a phase-change material with a melting point of 0-20 DEG C, and heating and mixing the obtained mixture, so that the phase-change material is completely liquefied and the nucleating agent is dissolved in the liquefied phase-change material so as to form transparent liquid; adding a surfactant into water or a liquid mixture of water and an anti-freezing agent, heating the obtained mixture until the temperature of the mixture is same as the temperature of a dispersed phase, and stirring the mixture, so that the surfactant is dissolved in the water or the liquid mixture of water and the anti-freezing agent so as to form transparent liquid; adding the dispersed phase into a continuous phase while persistently stirring so as to form a preformed emulsion; and stirring the preformed emulsion by using a high-speed homogenizer, so that the micron-order phase-change microemulsion disclosed by the invention can be obtained. The preparation method disclosed by the invention is simple in steps and low in cost, and the prepared micron-order phase-change microemulsion is high in energy storage density, stable in performance and small in degree of super-cooling, can be pumped and can be used as a heat storage medium and a heat transfer medium for refrigeration systems.