36results about How to "Uniform thermal stress" patented technology

The invention provides a laser cutting device. The laser cutting device comprises a machine table, a conveying mechanism, a cutting mechanism and a splitting mechanism, the cutting mechanism comprisesa moving platform and a laser cutter, the moving platform is used for storing workpieces and driving the workpieces to move according to a preset route, the laser cutter is used for emitting a laserbeam to pre-cut the workpieces on the moving platform and form a pre-cutting line, the laser cutting device further comprises a standing mechanism, the standing mechanism comprises a fixing frame, a carrier plate and two clamping assemblies, every clamping assembly comprises a clamping member and at least one clamping driving member, every clamping driving member is arranged on the carrier plate and adjacent to one side edge of the carrier plate, the clamping members are arranged on the clamping driving members and move under the driving of the corresponding clamping driving members to resistthe workpieces to in order to clamp and fix the workpieces and stand the workpieces for a preset time, and the splitting mechanism heats the stood workpieces along the pre-cut line to make the workpieces split along the pre-cut ling in order to realize the cutting of the workpieces.

The invention discloses a high-power semiconductor module suitable for balancing the heat of an internal power switch chip in a short-circuit condition. The high-power semiconductor module, accordingto a principle that the on-resistance of a power semiconductor device is controlled by gate voltage, adds an autonomous heat balance control circuit to each parallel device or each parallel chip in amodule, detects the temperature of the device by a temperature-sensitive element, and automatically adjusts the voltage applied to the gate of the device according to the parameters of the temperature-sensitive element, wherein the temperature-sensitive element can be a thermistor or voltage-regulator diode with a negative temperature coefficient. In the short-circuit condition, the temperature ofthe parallel chip rises, the thermistor achieves automatic feedback, the voltage applied to the gate of the chip decreases, the on-resistance of the device increases so as to automatically decrease the short-circuit current flowing through the chip. The passive heat balance control circuit of the invention is simple in structure and is easy to be integrated into a device driving board or high-power module, so that the parallel devices are thermally balanced, thereby improving the reliability of the power device.

The invention relates to a heat exchanger (1), especially for motor vehicles, comprising a housing (2) and at least one pipe (3) disposed inside said housing (2). The heat exchanger is characterized in that structures (4) are provided in the area between the pipes (3) and the housing (2) and/or between the pipes (3).

The invention discloses gas steam generating equipment. The gas steam generating equipment comprises a machine frame and more than one set of steam generating modules arranged in the machine frame, and each steam generating module comprises a combustion chamber, a finned heat exchanger, a tube type light tube heat exchanger and a low-nitrogen fire grate burner which are sequentially arranged in the combustion chamber from top to bottom; a cold water inlet and a hot water outlet are formed in each finned heat exchanger; each tube type light tube heat exchanger is provided with a hot water inletand a steam outlet; and the hot water outlets communicate with the hot water inlets. According to the steam generating equipment, the tube type light tube heat exchanges are adopted to be arranged inthe middle layers of the combustion chambers and serve as vaporization layers, so that heat absorbed by cold water is more sufficient, and higher-quality steam can be produced. The bottom layers of the combustion chambers adopt the brand-new low-nitrogen fire grate combustors, so that the heat exchange amount is improved, and meanwhile, the generation of nitrogen oxide is reduced, and the gas steam generating equipment is energy-saving and environment-friendly.

The invention belongs to the field of supercritical water treatment of waste organic substances, and discloses a pressure-bearing device with cooling function for the supercritical water treatment. The device comprises a barrel body (1) and an end cover (2), and is characterized in that the lower surface of the end cover (2) is provided with a cooling cavity (5), the outer wall of the cooling cavity (5) and the inner wall of the barrel body (1) form an annular narrow slit (7), the lateral wall of the cooling cavity (5) is provided with a jet hole (8), and a water inlet (6) of the cooling cavity is arranged on the upper surface of the end cover (2).

A device for providing the edge of a starting sheet of an electrode used in the electrolytic refining or recovery of metals with a dielectric part comprises a die space, in which the edge of the starting sheet of the electrode can at least partly be fitted, and a feeding device of the dielectric material for feeding the dielectric material into the die space. The device comprises changing members of the volume of the die space for pressing the dielectric material in the die space to that edge of the starting sheet of the electrode, which is at least partly fitted in the die space.

The invention provides a laser cutting method which comprises the following steps of providing a laser cutting device. The laser cutting device comprises a machine table, a conveying mechanism, a cutting mechanism, a standing mechanism and a splitting mechanism, wherein the cutting mechanism comprises a moving platform and a laser cutter; the splitting mechanism comprises a fixed jig and at leastone heating laser; the conveying mechanism takes and places a workpiece onto the moving platform; the laser cutter emits a laser beam to precut the workpiece located on the moving platform and forms aprecutting line; the conveying mechanism takes and places the precut workpiece onto the standing mechanism from the moving platform, and the precut workpiece is stood for a preset time; the conveyingmechanism takes and places the stood workpiece onto the fixed jig from the standing mechanism; and each heating laser is used for emitting a laser beam to heat the workpiece located on the fixed jigalong the precutting line, so that the workpiece is split under the impact of a heat stress along the precutting line so as to be cut. The laser cutting method has high cutting yield.

The invention discloses a plate shape control method of high-strength steel for a longitudinal beam of a commercial vehicle. The plate shape control method comprises the following steps that: 1) a hotblank is charged into a furnace; 2) the plate blank is heated; (3) rough rolling is conducted, specifically, a 1+5 rolling mode is adopted, bending amount of a C-shaped bend or an S-shaped bend in the last pass is controlled within +/-10mm, wedge shape control range is controlled within +/-20[mu]m, and rough rolling finishing temperature is controlled within 1040-1080 DEG C; (4) finish rolling isconducted, specifically, outlets of F1-F4 racks adopt large convexity value control, F5-F7 racks adopt an equal-proportion convexity control mode, and convexity control range of a finished product is0-20[mu]m; 5) layer cooling is conducted, specifically, a front-section ultrafast cooling and rear-section air cooling mode is adopted; 6) slow cooling is conducted, specifically, preheating is conducted in advance in a heat preservation wall, and a steel coil is hoisted into the heat preservation wall for slow cooling; and 7) straightening and flattening are conducted. According to the plate shape control method of the high-strength steel for the longitudinal beam of the commercial vehicle, the high-strength steel for the longitudinal beam of the commercial vehicle prepared is good in apparent plate shape, has no potential plate shape risk, and completely meets the high-standard requirement of a rolling forming process of the high-strength steel for the longitudinal beam of the commercial vehicle on the plate shape.

The invention discloses a plate shape control method for steel for a hot-rolled high-strength stirring tank body. The plate shape control method comprises the following steps that (1) hot blanks are charged; (2) plate blanks are heated; (3) rough rolling is conducted, specifically, a 1+5 rolling mode is adopted, the bending amount of C-shaped bending or S-shaped bending of the last pass is controlled within +/-10mm, the wedge-shaped control range is within +/-20[mu]m, and the rough rolling ending temperature is controlled to be 1040-1080 DEG C; (4) finish rolling is conducted, specifically, large convexity value control is adopted for outlets of F1-F4 racks, an equal proportion convexity control mode is adopted for F5-F7 racks, and the finished product convexity control range is 0-30[mu]m;(5) layer cooling is conducted, specifically, a front-section ultra-fast cooling and rear-section air cooling mode is adopted; (6) slow cooling is conducted, specifically, preheating is conducted ina heat preservation wall in advance, and steel coils are discharged from a production line and hoisted into the heat preservation wall for slow cooling; and (7) straightening and flattening are conducted. The steel for the hot-rolled stirring tank body is prepared according to the plate shape control method, the apparent plate shape of a material is good, the warping amount during discharging cutting is less than or equal to 5mm, and the requirements of the welding process of an automobile concrete stirring tank body for the plate shape are completely met.

The invention discloses a laser surface strengthening machining device for a plane type valve sealing surface. The machining device is characterized by comprising a control cabinet, a powder feeding device and a laser machining device; a controller is arranged in the control cabinet; the laser machining device is provided with a stand column sleeved with a rocker arm capable of rotating in all directions; a first sliding platform capable of moving horizontally is arranged on the rocker arm; a second sliding platform capable of moving vertically is mounted on the first sliding platform; a laser head and a powder feeding head are arranged on the second sliding platform; the powder feeding head is connected with the powder feeding device; the rocker arm moves vertically on the stand column; the vertical movement of the rocker arm and the vertical movement of the second sliding platform form a double-Z-axis structure; and machining stations are arranged on the periphery of the stand column. The double-Z-axis structure is adopted, the device has the high precision for adjusting the machining position of a machined piece, and the machining process and the preparation process of the device do not interfere with each other, so that the device has the advantages that the machining precision is high, the quality of a machined layer is well controlled, the device is convenient and simple to operate and the like. The invention further discloses a machining method.

The present invention provides an oil and gas fired boiler having an annular combustion chamber. The oil and gas fired boiler is provided with a shell, a furnace and water pipes. A plurality of combustion engines are configured at the periphery of the shell, and the furnace is arranged in the center of the shell. The annular combustion chamber is positioned at a lower portion in the furnace, and the water pipes are positioned at an upper portion in the furnace. The annular combustion chamber is communicated with the upper portion in the furnace to form a smoke flow channel for combustion heat exchange. A space between the furnace and the shell and spaces inside the water pipes form water evaporation upstream channels. The boiler is compact in integral structure, simple in geometrical shape, small in size and high in strength, heat exchange is convenient and sufficient, and thermal stress of the furnace is uniform. The advantage that no solid waste residue is discharged from an oil and gas fired boiler is fully performed, and requirements on fast assembly, modularization and integral assembly of a middle-large sized oil and gas fired boiler can be substantially satisfied. The history that an oil and gas fired boiler uses a structure of a coal fired boiler will be ended. The oil and gas fired boiler having the annular combustion chamber is a boiler according with oil and gas fired characteristics.

A tubular filament assembly for a CVD silicon deposition reactor is disclosed that provides consistent, low resistance connections to vertical tubular filaments by forming slidable connections between upper and/or lower ends of the tubular filaments and shaped elements cooperative with the bridge and/or the support chucks, so that the connections are insensitive at least to small variations in tilt angle of the vertical filaments and/or the horizontal bridge. The shaped elements can be incorporated into or separate and cooperative with the bridge and/or the chucks. Various embodiments are described.

The invention relates to the technical field of jun porcelain glaze, in particular to jun porcelain sky blue glaze and a preparation method thereof. Frit is prepared from the following raw materials in parts by weight: feldspar, quartz, fluorite, talc, wollastonite and a phosphorus compound. The glaze slip is prepared from the following raw materials in parts by weight: frit, clay, ferric oxide, strontium carbonate, copper oxide, titanium oxide, cobalt oxide, manganese oxide and hydroxypropyl methyl cellulose; through quartz, fluorite, talc and a phosphorus compound, glaze pinhole defects areeliminated, glaze gloss is increased, finished product quality is improved, and glaze gloss is increased. The amounts of feldspar and quartz are reasonably configured, and a good middle layer is formed between the glaze layer and the green body so that the green body and the glaze are tightly combined; the thermal stress between the blank and the glaze is uniform, the stress between the blank andthe glaze is weakened, and the mechanical strength of the Jun porcelain is improved; through high-temperature 'reducing flame' and twice low-temperature 'oxidizing flame' calcination, colored metal generates different reactions at different temperatures to display different colors so that the sky blue glaze is variable in color.

A silo combustion chamber for a gas turbine having a flame tube having an inner wall and flame tube base delimiting a combustion chamber; an outer wall surrounding the inner wall, forming a cavity; an annular chamber at least partly surrounding the outer wall and a number of supply lines fluidically coupled to the hot side of a heat exchanger during operation of the turbine; a number of burners, each of which opens into the combustion chamber on the outlet side through an opening in the flame tube base. The oxygen supply is fluidically connected to the annular chamber. A collecting chamber is arranged over the flame tube base. The annular chamber is connected to the collecting chamber via each connecting piece, each burner is fluidically connected to the collecting chamber to supply oxygen. The cavity between the inner and outer wall is locally fluidically separated from the collecting chamber.

The invention discloses a permanent magnet synchronous motor rotor positioning control system and an air conditioner. The control system comprises: a calculation unit which is used for calculating a target phase theta (i) of motor rotor positioning when i is greater than or equal to 1 and less than N: theta (1) = 0 degree, theta (i + 1) = theta (i) + [delta] theta, wherein N = 360 degrees/[delta] theta and is a multiple of 6, and i is a natural number; a storage unit that stores a target phase theta (i) ( i is greater than or equal to 1 and less than N) for starting a cycle; and a processing unit used for setting the d-axis current of the motor as a first value and setting the q-axis current of the motor as a second value in a motor rotor positioning stage, and controlling the motor rotor to be alternately positioned to a target phase theta (i) which is ranked from small to large in the starting cycle. The thermal stress of the power switch element in the three-phase power inverter is balanced by rotating the target phase positioned by the motor rotor, and the service life of the three-phase power inverter is prolonged.