7results about How to "Increase subcooling" patented technology

The present application relates to the technical field of rail production process, in particular to a production method for improving wear resistance of channel rail for tram. After universal rolling, compressed air is applied to the channel rail for forced cooling in parts. In the first stage, supersonic air jet cooling is applied to the rail head tread, rail head running edge, rail head left side, rail lip and rail bottom to control the cooling speed of each part. In the second stage, supersonic air jet cooling is continuously applied to each part of the rail to control the cooling speed of each part. In the third stage, subsonic air jet cooling is applied to each part of the rail to control the cooling speed of each part, and then the rail is naturally cooled in air. The quenching effect of the channel rail tread and running edge is improved, the pearlite interlamellar spacing is refined, the rail strength and hardness are improved, and the channel rail has good wear resistance.

This invention provides a regenerative reverse Rankine cycle dual high-temperature heat pump system. The heat pump system includes: a first heat exchanger, a first compressor, a first regenerator, a second heat exchanger, and a first expansion valve. The first heat exchanger is connected to the first compressor via the first regenerator. The second heat exchanger is connected to the first compressor. The first expansion valve is connected to the first heat exchanger, and the second heat exchanger is connected to the first expansion valve via the first regenerator. By setting up the first regenerator, heat exchange is performed between the working fluid before throttling and before compression, thereby increasing the subcooling before throttling and significantly reducing throttling losses. At the same time, increasing the superheat at the outlet of the first heat exchanger avoids the damage to the compressor caused by wet compression due to ultra-high temperature dry working fluid, which helps to ensure the service life and high reliability of system components.

The invention discloses a method for refining 316L stainless steel grains based on a selective laser melting technology, and belongs to the technical field of metal material additive manufacturing. According to the method, Fe-C-B alloy powder is added, a Fe-B or Fe-B-Cr type compound is formed to serve as a heterogeneous nucleation core when the 316L stainless steel component is manufactured through selective laser melting, columnar crystal epitaxial growth is inhibited, and grain refinement is achieved. By means of the synergistic effect formed by Fe, C and B, the negative influence of the SLM technology on the 316L stainless steel forming process is avoided, the advantages of the SLM technology are fully exerted in the 316L stainless steel component forming process, accordingly, the 316L stainless steel component high in compactness and excellent in comprehensive performance can be formed only through SLM, the method is stable in process, low in crack sensitivity and high in yield, and the production cost is reduced. The method has remarkable advantages in the field of additive manufacturing of high-performance 316L stainless steel components.

An air-source heat pump system includes a compressor, a four-way reversing valve, a throttling device, an outdoor heat exchanger, outdoor piping, a distributor, a water-side heat exchanger, a first check valve, a second check valve, and a third check valve. The outdoor piping is connected to the four-way reversing valve and the throttling device, and is also connected to the cooling ends of the top, middle, and bottom heat exchange units. The heating ends of the top, middle, and bottom heat exchange units are connected to the branch interface pipe, and the main interface pipe is connected to the outdoor piping and the throttling device. The second and third check valves are located on the outdoor piping; the liquid outlet of the second check valve is connected to the throttling device, and the outdoor piping between the bottom heat exchange unit and the second and third check valves is connected. The liquid outlet of the first check valve is connected to the main interface pipe, and its liquid inlet is connected to the piping between the second check valve and the throttling device. During heating, the system improves the heat exchange efficiency of the outdoor heat exchanger; during cooling, it improves the subcooling.

This invention provides a method for preparing an aluminum-silicon-copper sputtering target. The method includes: (I) providing aluminum, silicon, and copper raw materials, and dividing the aluminum raw material into two parts; (II) melting one part of the aluminum raw material to obtain an aluminum melt, then adding the silicon and copper raw materials to the aluminum melt, and performing a first melting at a first temperature to obtain a primary alloy melt, adding the remaining aluminum raw material to the aluminum-silicon-copper alloy melt, and performing a second melting at a second temperature to obtain a secondary alloy melt; (III) sequentially degassing, refining, and slag removal from the secondary alloy melt to obtain a purified alloy melt; (IV) sequentially casting and cooling the purified alloy melt to obtain an aluminum-silicon-copper ingot; wherein the first temperature is higher than the second temperature. This invention solves the problem of Si element aggregation in high-purity aluminum-silicon-copper alloys and can avoid silicon segregation in alloy ingots.

This invention relates to a compact V-type condenser with a subcooling section, comprising a V-type heat exchanger and a condensing fan mounted above it. The V-type heat exchanger includes a heat exchanger 1 and a heat exchanger 2 arranged symmetrically and inclined. The V-type heat exchanger is divided into a heat exchange section near the condensing fan and a subcooling section away from the condensing fan. The refrigerant is connected through a manifold, which includes an exhaust manifold and a liquid collection manifold located in the heat exchange section, and a subcooling manifold and a return manifold located in the subcooling section. The refrigerant flows from the exhaust manifold through several heat exchange paths into the liquid collection manifold, then into the subcooling manifold, and finally into the return manifold through several more heat exchange paths. The subcooling section further subcools the already liquefied refrigerant. This invention, without increasing the condensing area, improves the internal heat exchange effect of the refrigerant simply by adjusting the refrigerant flow path, effectively increasing the utilization rate of the heat exchanger area, and has significant economic and promotional value.

A kind of composite manufacturing method of TC11 titanium alloy thin-walled cylinder, based on the idea of additive + welding composite manufacturing, according to the size and structure characteristics of workpiece, the complex shape part in thin-walled cylinder is prepared by selective laser melting, and the other part is prepared by machining of forgings.The additive + welding composite method is used to manufacture TC11 titanium alloy thin-walled cylinder, which solves the problem that the integration forming of large-size aerospace structure is limited by the volume of atmosphere cabin or vacuum chamber, realizes the optimization of processing resources, and takes into account the processing efficiency and material utilization.The addition of Cu and Mn powder promotes the composition of the solid-liquid front of the molten pool to be supercooled, thereby promoting the transformation of columnar crystal to equiaxed crystal, and equiaxed grains are obtained by additive manufacturing.The tensile strength of TC11 alloy after double annealing is 1285MPa, and the elongation is 9.5%.Laser welding method is used to realize the connection of additive manufacturing TC11 alloy and forged TC11 alloy, and the tensile strength of the welded joint is 1536.5MPa, and the fracture mode is plastic fracture.