31results about How to "Release thermal stress" patented technology

A ground-enhanced semiconductor package and a lead frame used in the package are provided. The semiconductor package includes a lead frame having a die pad, a plurality of tie bars connected with and supporting the die pad, a plurality of leads surrounding the die pad, and a ground structure, wherein the ground structure comprises at least one of first ground portions connected to the tie bars, and/or at least one of second ground portions connected to the die pad, and wherein the first ground portions are separate from each other, and the second ground portions are separate from each other; at least one chip mounted on the die pad and electrically connected to the leads and the ground structure; and an encapsulation body for encapsulating the chip and the lead frame. The separately-arranged ground portions allow thermal stresses to be released from the ground structure without rendering deformation issues.

The invention provides a laser additive device which comprises a rotary light beam laser system, a high-frequency short pulse laser system and an auxiliary current system. The rotary light beam lasersystem outputs rotary continuous laser light, and the continuous laser light is used for melting and depositing wires to the surface of a base material; the high-frequency short pulse laser system outputs high-frequency short pulse laser light, and the high-frequency short pulse laser light is used for inputting a pulse laser beam into a molten bath. The auxiliary current system is used for enabling the wires and the molten bath to form a current loop, and therefore strong electromagnetic force is directly produced in the molten bath. The rotary light beam laser system comprises a continuous laser generator, a first high precision mechanical arm and a continuous laser device laser head. The high-frequency short pulse laser system comprises a high-frequency short pulse laser generator, a high-frequency short pulse laser head and a second high precision mechanical arm. The defects that element segregation is likely to be caused in the molten bath, gas cannot be exhausted, the structure is uneven, and heat stress is concentrated can be overcome.

The invention relates to a manufacturing method of a flexible thermo-electric device and the manufactured flexible thermo-electric device. The method comprises the steps that a red copper wire mesh with high electric conduction performance is adopted as an electrode material, the red copper wire mesh is directly fixed to a die substrate, high-temperature-resisting silica gel is adopted as a flexible substrate to replace a traditional ceramic substrate, P-N thermo-electric particles alternately fall into a grid die device, on the basis of achieving overall welding, line cutting of design patterns is carried out on cold and hot end faces, and each pair of P-N semiconductor thermo-electric particles is of a parallel-connection independent structure in electrology and series-connection thermology; basic curing operation of high-temperature-resisting flexile insulation is carried out on a device achieving adjustable gluing thickness, and the flexible device is obtained. The flexible device can be bent by a large angle, a semiconductor material body is not changed, semiconductor material components obtained after doping modification are not influenced, the application occasion of the thermo-electric device is widened, the device is not restricted to plane occasions any more, and heat stress generated in the work process of the thermo-electric device is released.

The invention comprises an upper layer and a lower layer. On the upper layer there is a gyroscope mechanical structure made on a monocrystalline silicon plate; on the lower layer there are signal leads made on the glass substrate. The inner frame of the gyroscope upper layer mechanism structure is connected to the outer frame of the detection support beam; on the gyroscope lower layer glass substrate there are grounding lines, driving input leads, sensitive output signal lines; the upper layer mechanical structure is mounted on the linkage point of the fixed base on the glass substrate through the fixed base in order to make the upper layer mechanical structure hang above the lower layer glass substrate. The invention features U-shaped beam structure used by both the driving sport beam and detection support beam.

An exhaust heat recovery device includes an evaporator disposed to evaporate a working fluid by exchanging heat between a heating fluid and the working fluid, a condenser disposed to cool and condense the working fluid by exchanging heat between a fluid to be heated and the working fluid evaporated by the evaporator, an evaporation side connection portion for guiding the working fluid evaporated by the evaporator to the condenser, and a condensation side connection portion for guiding the working fluid condensed by the condenser to the evaporator. Furthermore, at least one of the evaporation side connection portion and the condensation side connection portion has a curved portion.

The invention discloses a hollow layering steam injecting system. An heat preservation oil pipe is connected below a well head device; the lower end of the heat preservation oil pipe is connected with a telescopic pipe; the lower end of the telescopic pipe is connected with a steam distributing pipe column part; the steam distributing pipe column part comprises an anchor, an oil pipe, packers, an oil pipe releaser and a hollow steam injecting valve; the anchor is positioned at the uppermost end of the steam distributing pipe column part; the lower end of the telescopic pipe is connected with the anchor; in the steam distributing pipe column part, a top packer is arranged above a top oil layer, and is connected to the lower end of the anchor; a middle packer is arranged in a gap of adjacent two oil layers; the oil pipe, the hollow steam injecting valve and the oil pipe releaser are connected between adjacent two packers; and the lower end of the middle packer above a lowermost oil layer is connected with the oil pipe, the hollow steam injecting valve, the oil pipe and a plug. The hollow layering steam injecting system can preferably release thermal stress of a pipe column, is more accurate and effective in steam injecting effect, prevents the steam injecting valve from scaling to block a steam injecting channel, and increases the inner diameter of the pipe column for convenient dropping and fishing.

A planar fluorescent lamp having a first panel, a second panel, a glass rim, a venting tube, and a set of electrodes. Fluorescent layers are formed on both the first panel and the second panel. The glass rim is mounted on edges of the first and second panels. A recess and a gap are formed in the glass rim; the recess is used for placing the electrodes while the gap is reserved for installing the venting tube. The first panel, the second panel, and the glass rim are so arranged so that a cavity is formed thereby. The cavity is vacuumed via the venting tube and mercury vapor and inert gas are then introduced into the cavity.

The invention discloses a cast iron exhaust manifold for a supercharged gasoline engine, comprising a plurality of air passages, wherein an inlet flange is molded at the inlet end of each air passage in an integrated casting way, and an outlet flange is molded at the outlet end of each air passage in an integrated casting way. The middle position of each inlet flange is machined with a notch to separate the inlet flange into a left section and a right section so as to release heat stress of a flange plate of the cast iron exhaust manifold, and thus the heat deformation of the cast iron exhaust manifold is reduced; and heat shield mounting lugs are arranged at two ends of each inlet flange close to the first air passage and the fourth passage, the mounting points are arranged on the inlet flange with lower temperature as possible, and thus the arrangement of heat shield mounting points at an area with higher temperature is avoided, the quantity of high-temperature-resistance bolts is reduced, and the cost is lowered.

The invention discloses a rotating limiting support for a thermal pipe. The support comprises a pipe clamp, rotating shafts and a supporting system, wherein the supporting system comprises a supporting frame and a supporting plate; the supporting frame comprises a transverse supporting frame and longitudinal supporting frames; the rotating shafts comprise an upper rotating shaft and a lower rotating shaft, the lower end of the upper rotating shaft is welded at the upper end of the pipe, and the upper end of the lower rotating shaft is welded at the lower end of the pipe; rotating shaft grooves are located in the supporting system; and the rotating shafts are sleeved with the rotating shaft grooves. The support overcome defects that only linear displacement in one or two directions can be limited and angular displacement is limited on the premise that the linear displacement of the position of a supporting point is limited in the prior art are overcome; and the rotating limiting support has the advantages that the rotating shafts are increased on the pipe clamp, and limiting supporting is designed, so that the linear displacement of the pipe in a heated state is limited, the angular displacement is allowed on a certain plane, and partial swelling stress is released. The invention further discloses a rotating limiting method of the rotating limiting support for the thermal pipe.

The invention discloses a method for laser cladding of a Mo-Cu alloy layer on a copper substrate. The method comprises the following steps: 1) drying Mo powder and Cu powder in vacuum; 2) polishing and cleaning a cladding substrate; (3) performing cladding with a high-speed laser cladding device, during cladding, adopting double-cylinder powder feeding, and controlling the powder feeding amount of the Mo powder and Cu powder respectively to achieve the purpose of gradient cladding, wherein the mass ratio of Mo to Cu of the cladding alloy layer is sequentially increased in a gradient mode, in addition, the cladding substrate is loaded on a high-frequency vibration platform, and the high-frequency vibration platform generates platform type vibration during cladding. Gradient cladding is adopted, the binding force between a cladding layer and a base body and the strength of the cladding layer are improved, and the uniformity of Mo and Cu components and structures in the cladding layer is improved through double-cylinder powder feeding. High-frequency vibration in cladding effectively releases thermal stress in the cladding layer, improves the strength of the cladding layer, improves the fluidity of a molten pool, reduces air hole shrinkage in the cladding layer, improves the strength of the cladding layer and the like.

The invention discloses a furnace drying method for a new intermediate-frequency furnace during pre-alloyed powder smelting. According to the furnace drying method for the new intermediate-frequency furnace during pre-alloyed powder smelting, scientific and reasonable design is adopted, moisture in brickwork is dissipated slowly and reasonably by controlling the heating rate, so that sudden stress changes are avoided, and the influence of disordered and arbitrary operation on furnace drying is avoided; and compared with a traditional technique, the furnace drying method has the advantages that a furnace drying temperature curve of the new furnace is designed scientifically and reasonably, the furnace drying time is short, the production efficiency is high, the service life of the new furnace is long, and the smelting effect is good.

The invention discloses a device and a method for growing a high-temperature oxide crystal by an improved heat exchange method with a seed crystal arranged on the top, which are characterized in that a kyropoulos method, a Czochralski method (CZ), a heat exchange method (HEM), a temperature gradient method (TGT), a Bridgman-Stockbarger method and a kyropoulos method (KY method) are combined together; according to the special high-temperature vacuum crystal furnace, gas flows in from the center of the top of a hearth from top to bottom, absolute uniform and symmetrical flow out from the center of the bottom is ensured through flow planning, and gradients of all parts in different growth stages are achieved by adjusting the gas flow in different stages and the pumping speed of a vacuum pump. The method comprises the following steps: charging a furnace, vacuumizing, introducing flowing protective gas, heating and melting materials, washing seed crystals, changing the gas inlet and outlet proportion, carrying out real-time gradient adjustment, seeding by a pulling method, carrying out a hole shrinkage process, increasing the shouldering process of a heat exchange method for increasing the gas flow, controlling a crystal growth interface (adjusting a convex interface to be slightly convex or close to a flat interface), and carrying out equal-diameter growth by combining HEM heat exchange with a KY technology (namely carrying out equal-diameter growth by combining HEM heat exchange with a KY technology). A weighing diameter control technology is optimized; amp is ended through a KY method; and removing the crucible, and performing in-situ annealing by gradually increasing the pressure of the protective gas. According to the invention, the existing method is combined to produce the large-size high-temperature oxide crystal.

The invention discloses a kilneye protection reinforcing mechanism, a protection device and a rotary kiln, and belongs to the technical field of rotary kiln protection. According to the kilneye protection reinforcing mechanism, through connection of the cylinder wall reinforcing piece and the end opening reinforcing piece, the whole kilneye protection reinforcing mechanism has high strength, in addition, the cylinder wall reinforcing piece and the end opening reinforcing piece can be used in a cylinder wall castable in the kilneye cylinder wall and an end opening castable at the kilneye end opening, and the castable locally has good strength; and in addition, the kiln mouth protection reinforcing mechanism and the castable form a whole, so that the occurrence of structural damage caused by high-temperature thermal expansion due to higher working condition temperature in the use process is reduced.

The invention discloses a container and a cooking utensil. The container comprises a container body and a coating, the container body defines a cavity with a top opening, the coating is arranged on the surface of the container body, and the thickness of at least one part of the coating is gradually increased in the radial direction of the container body towards the direction close to the center of the bottom of the container body. According to the container disclosed by the embodiment of the invention, the coating is sprayed on the surface of the container body so that the thickness of the coating is gradually increased along the radial direction of the container body towards the direction close to the center of the bottom of the container body, and therefore, a thermal stress is effectively released, the coating is prevented from falling off, and the reliability of the coating is ensured.

The invention discloses a grid used in a grid-controlled pulse traveling wave tube electron gun and a manufacturing process thereof. The grid includes a grid substrate made of molybdenum, a gradient functional layer formed on the grid substrate and a composite anti-grid electron emission film formed on the gradient functional layer. The gradient functional layer is prepared by Nb or Ta. The composite anti-grid electron emission film is prepared by using a high-melting point material having a work function of more than 4 eV. The manufacturing process includes the following steps: (1) performinghigh temperature vacuum degassing on the formed grid substrate of a molybdenum material at 700-1000 DEG C; (2) preparing the gradient functional layer on the grid substrate by using ion implantationand vacuum deposition coating; (3) preparing the composite anti-grid electron emission film on the gradient functional layer by using the ion implantation and vacuum deposition coating; and (4) performing high temperature heat treatment on the prepared grid. The grid of the invention can suppress grid electron emission of a grid-controlled pulse traveling wave tube and improve the working reliability and service life of the grid-controlled pulse traveling wave tube.