5results about How to "Zero leakage" patented technology

The invention discloses a method for preparing gamma-butyrolactone and coproducing succinic acid through maleic anhydride hydrogenation. The invention relates to a method for producing gamma-butyrolactone and succinic acid by using maleic anhydride as a raw material through solvent-free direct catalytic hydrogenation, which is carried out in three units and comprises the following specific steps: directly hydrogenating a maleic anhydride solution, and separating to obtain high-purity gamma-butyrolactone and succinic acid products through the procedures of hydrolysis, recrystallization, extraction, rectification and the like. According to the method, the conversion rate of the raw material maleic anhydride can reach 99.9% or above, the selectivity of succinic anhydride and gamma-butyrolactone is 100%, excessive hydrogenation byproducts are avoided, the separation energy consumption is reduced, and the technological process is simplified. And the extraction agent, the extraction raffinate and the recrystallization mother liquor are all recycled, so that the energy consumption is reduced, and the equipment cost and the production cost are greatly saved. Meanwhile, the method has the advantages that the generation proportion of the gamma-butyrolactone and the succinic acid can be adjusted by changing hydrogenation reaction conditions, and the complex and changeable market requirements can be flexibly met.

The invention belongs to the technical field of mechanical engineering sealing, and particularly relates to a magnetofluid sealing structure of an oil guide groove cover plate of a water-turbine generator set and a comprehensive experiment table. The magnetofluid sealing structure of the oil guide groove cover plate of the water-turbine generator set comprises a main shaft, a rotating shaft pole shoe assembly and a static pole shoe assembly, the rotating shaft pole shoe assembly comprises a rotating shaft pole shoe, a rotating shaft sealing boss is arranged on the lower surface of the rotating shaft pole shoe, and sealing teeth are arranged on the outer side of the rotating shaft sealing boss. The static pole shoe assembly is arranged outside the main shaft in a sleeving mode, a first ring groove and a third ring groove are formed in the upper surface of the static pole shoe assembly, magnetofluid is arranged in the first ring groove, the first ring groove is matched with the sealing teeth, the sealing teeth extend into the magnetofluid, and the third ring groove is matched with the rotating shaft sealing boss; the guide bearing oil groove cover plate of the water-turbine generator set is sealed through the magnetic fluid seal, so that the problems of oil mist overflow and main shaft abrasion are effectively solved; the comprehensive test bench is used for simulating the sealing performance of the magnetofluid seal under real working conditions.

The invention belongs to an explosion valve structure, and particularly relates to an angle type explosion valve with an inlet side and an outlet side capable of bearing pressure simultaneously. The angle type explosion valve with the inlet and the outlet bearing pressure simultaneously comprises a valve body, a piston is arranged in the valve body, a detonating device is arranged at the end of the piston, and a pipe connecting cap is arranged below the valve body. The explosion valve has the remarkable effects that firstly, the explosion valve has the advantages of zero leakage and quick and reliable opening functions of the explosion valve; an angle type explosion valve structure is adopted, aiming at angle type connecting pipe arrangement, a valve main body structure is transversely arranged, the whole machine is low in height, flexible and compact, and installation and arrangement are convenient; the design of the two pipe connecting caps can realize the application occasions that the inlet and the outlet bear pressure at the same time, only the inlet side bears pressure or only the outlet side bears pressure and the like, and is suitable for more complex working conditions.

The embodiment of the present invention is about a heat exchanger and a sealing assembly for a heat exchanger tube with a non-circular cross section, which relates to the technical field of heat exchangers. The main technical problem to be solved is the poor sealing between the heat exchange tube with a non-circular cross section and the surrounding partitions in the heat exchanger. The main technical scheme adopted is: the sealing assembly for the heat exchanger tube with a non-circular cross section includes: a sealing tube sheet, a sealing hole is provided on the plate surface, and the sealing hole includes an embedded sealing section and an anti-corrosion sealing section; a heat exchange tube with a non-circular cross section is passed through the sealing hole, and an annular sealing groove is formed between the embedded sealing section of the sealing hole and the tube wall of the heat exchange tube with a non-circular cross section, and a filling gap is formed between the anti-corrosion sealing section of the sealing hole and the tube wall of the heat exchange tube with a non-circular cross section; an elastic sealing ring, the elastic sealing ring is embedded in the annular sealing groove and supported between the heat exchange tube with a non-circular cross section and the sealing hole; and an anti-corrosion sealant is filled in the filling gap. It can ensure reliable sealing, good sealing effect, and zero leakage.

The utility model relates to a sealing structure of a compressor, in particular to a sealing structure of an axial flow compressor, and aims to solve the technical problem that in the prior art, a single labyrinth sealing mode cannot meet the sealing leakage rate requirement. The sealing structure of the axial flow compressor comprises an axial flow compressor shell provided with a through hole, a first sealing body is arranged on the inner side of the axial flow compressor shell, and the first sealing body extends out of the through hole; a rotating shaft hole is formed in the first sealing body, and a rotating shaft of the axial flow compressor extends out of the rotating shaft hole; a labyrinth sealing gap is formed between the large end of the rotating shaft and the first sealing body; the small end of the rotating shaft is sleeved with a sealing shaft sleeve, the sealing shaft sleeve is sleeved with a second sealing body, the second sealing body is fixedly installed on the outer end face of the first sealing body, a plurality of installation grooves are formed in the inner wall of the second sealing body in the circumferential direction, and carbon rings are installed in the installation grooves. The inner wall of the second sealing body, the outer wall of the sealing shaft sleeve and the carbon ring form a carbon ring sealing gap.