38 results about "Thermal contact conductance" patented technology

A method of forming a well-anchored carbon nanotube (CNT) array, as well as thermal interfaces that make use of CNT arrays to provide very high thermal contact conductance. A thermal interface is formed between two bodies by depositing a continuous array of carbon nanotubes on a first of the bodies so that, on mating the bodies, the continuous array is between surface portions of the first and second bodies. The thermal interface preferably includes a multilayer anchoring structure that promotes anchoring of the continuous array of carbon nanotubes to the first body. The anchoring structure includes a titanium bond layer contacting the surface portion of the first body, and an outermost layer with nickel or iron catalytic particles from which the continuous array of carbon nanotubes are nucleated and grown. Additional thermal interface materials (TIM's) can be used in combination with the continuous array of carbon nanotubes.

In a temperature control method, a controlled part is arranged to contact a first principal surface of a heat conduction part. The heat conduction part has the first principal surface and a second principal surface opposite to the first principal surface. The first principal surface has a configuration corresponding to a configuration of the controlled part. The second principal surface has an area larger than an area of the first principal surface. At least one of a heating unit and a cooling unit is driven to set the controlled part at a predetermined temperature. The heating unit and the cooling unit are disposed on the second principal surface of the heat conduction part so that the heating unit and the cooling unit are arranged side by side.

The invention discloses a PE electric smelting pipe fitting welding parameter setting method based on finite elements. The PE electric smelting pipe fitting welding parameter setting method comprises the following steps: (1) initially determining the welding voltage of a PE electric smelting pipe fitting; (2) setting thermal analysis parameters; (3) establishing a finite element heat transfer model for connecting the electric smelting pipe fitting and a pipe in ANSYS WORKBENCH; (4) setting contact thermal conductivity coefficients between a thermal fuse and the PE material and between the electric smelting pipe fitting and the pipe in the electric smelting pipe fitting; (5) setting the division type of a model mesh and the size of the mesh, and then dividing the mesh; (6) carrying out loading heating on the model; (7) setting analysis time and step length for solution; (8) extracting the result of the solution and determining welding parameters. According to the method, the setting efficiency of the welding parameters of the electric smelting pipe fitting is improved, and the welding quality of the PE electric smelting pipe fitting is ensured.

The invention provides a method and a device for testing the thermal contact resistance of joint surfaces between cylindrical sleeve walls. According to the method and the device, an outer-ring test piece, an inner-ring test piece and a calibrated copper ring are orderly nested and connected to each other to create a one-dimensional steady-state heat conduction environment with conduction in the radial direction of the ring-shaped test pieces. Temperature sensors arranged in different radiuses in the radial direction are used for measuring the temperatures in different radiuses of each test piece; the measured temperature values of the two test pieces are fitted by use of a numerical method and pushed out to the contact joint surfaces to obtain temperature drop at the contact joint surfaces; the heat flux density at the contact joint surfaces is obtained by use of the measured temperatures of the calibrated copper ring and according to a radial one-dimensional heat conduction line heat flux density formula per unit length; finally, the thermal contact resistance of contact joint surfaces is obtained on the basis that the thermal contact resistance is the reciprocal of the contact heat conduction; meanwhile, the heat conductivity coefficient of the inner-ring and outer-ring test pieces also can be obtained according to the law of radial one-dimensional heat conductivity coefficients.

An outer plastic tube has water connections through the wall into an annular space defined by an O-ring spacer-gasket positioned between the wall and the perimeter margin of an inner cylinder rolled from a single-layer of sheet metal. A metal drainpipe with a removable bullet-shape at one end is forced through the cylinder to expand it and to thereby compress the gasket sealing the annular space. Thermal contact conductance is increased by the compressive force of water pressure. Water flow through the heat exchanger is both annular and turbulent to optimize heat transfer.

The invention discloses a rolled part temperature collection method for a plate and strip hot rolling production line, which comprises the following steps of: constructing equipment arrangement of theplate and strip hot rolling production line, and obtaining related process parameters; dividing a rolled part heat exchange area according to equipment arrangement on the production line, wherein theheat exchange area comprises an air cooling area, a water cooling area, a roll gap contact heat conduction area and a heat radiation heat preservation area; dividing width-thickness section grid nodes of the rolled part, and establishing coordinate system parameters and a temperature calculation model of each node; obtaining initial temperature distribution of the rolled part at the initial calculation position; from the initial calculation position to the final calculation position, the heat exchange area where the rolled part section is located is judged firstly when calculation is conducted every time, and then the temperature distribution of the rolled part section at the position is calculated through a corresponding rolled part temperature model. The method has the beneficial effects that the principle is clear and definite, assumption and simplification conditions are few, the temperature field change of the rolled part on the given hot rolling production line can be accuratelyforecasted, and the calculation precision is higher than that of an analytical method.

The invention discloses a cylindrical battery module cooling system, and the system comprises an insulating bracket, a heat conduction layer and a heat exchange plate; a battery cell matching groove is formed in a battery cell contact surface of the insulating bracket, and a heat exchange end surface of the insulating bracket is in contact with the heat exchange plate; the heat conduction layer coats the battery cell contact surface and the heat exchange end surface of the insulating bracket; the heat conduction layer comprises an insulation surface layer, a graphite film and an elastic bufferlayer. The cylindrical battery module cooling system takes an insulating bracket as a support, a battery cell contact surface and a heat exchange end surface of the insulating bracket are provided with a heat conduction layer comprising an insulating layer, a graphite film and an elastic buffer layer, and a battery cell, the heat conduction layer and a heat exchange plate are combined to form aneffective solid-solid contact heat conduction structure. The invention also discloses a battery module.

The invention provides a stator assembly and a motor, the stator assembly comprises a stator core with a plurality of stator slots, each stator slot is internally provided with two layers of windings, a gap is arranged between the two layers of windings, the stator assembly further comprises a heat dissipation part used for heat dissipation of the windings, the heat dissipation part comprises a heat conduction pipe and a heat dissipation element, and the heat conduction pipe is arranged in the heat dissipation element. One end of the heat conduction pipe is connected with the heat dissipation element, the other end of the heat conduction pipe is inserted into the gap and conducts heat with the winding through contact, the gap is filled with heat conduction silicone grease with electrical insulation, and the heat conduction silicone grease is used for transferring heat generated by the winding to the heat conduction pipe. According to the stator assembly and the motor in the technical scheme, the stable temperature rise of the motor applying the technical scheme is greatly reduced during operation, and the power density and the reliability are greatly improved, so that the problem of insufficient effective load of an unmanned aerial vehicle caused by overhigh operation temperature rise and low motor power density of the motor in the prior art is solved; therefore, the effective load, the endurance time and the reliability of the unmanned aerial vehicle are improved.

The embodiment of the invention provides a hot stamping measurement tool and a use method thereof. The hot stamping measurement tool is refitted based on an ordinary single pull machine and mainly comprises devices of a water cooling substrate, an insert made of a mould material, a clamp for clamping the insert, a batten for testing, a plate material movement driving device, a device for heating aplate material, a thermoelectric couple for monitoring a temperature, a data collector, a computer for data observation and the like. According to the hot stamping measurement tool disclosed by the embodiment of the invention, the heating device, the testing device and the driving device are arranged on the same platform; varieties of parameters of a contact heat transfer coefficient between a hot stamping plate material and a mould, convective heat transfer coefficient of a runner, friction abrasion of the module and the like can be measured; the hot stamping measurement tool has the advantages of high automation degree, strong operability and rich functions; the parameters obtained from the testes can provide accurate input for hot press simulation analysis and has important significance in prolonging service life of the hot stamping mould and improving product performance.

The invention discloses a board card structure for protecting a thermal contact surface based on a reed. The board card structure structurally comprises a reed (1), a heat transfer cold plate (2), a locking device (3), a heat dissipation cold plate (4) and a heat conduction interface material (5). According to the structure, a groove is designed on a heat transfer contact surface of a heat transfer cold plate (2) of a case board card and is used for installing the reed (1); and in the board card plugging process, through the elastic force of the reed (1), the contact surfaces of the heat conduction interface material (5) on the heat transfer cold plate (2) and the heat dissipation cold plate (4) are rapidly separated and keep a relative distance, so that the heat conduction interface material (5) is prevented from being damaged in the plugging process.

The invention provides a wearable device for heat preservation. The device is used for preventing and treating the hypothermia phenomenon of a patient in the perioperative period in the operation process and comprises a heating body which is in a clothes shape and can convert electric energy into heat energy, and the heating body is provided with a heat conduction face used for making contact withthe skin of the patient. The heating body is directly made into the clothes shape; when the patient wears the device, the heat conduction surface on the heating body is contacted with the patient; the contact area between the heat conduction surface and the patient is large, and the contact position between the heat conduction surface and the patient can provide heat for the patient, so that theheating area of the patient is increased, the heating efficiency is greatly improved, the body temperature of the patient is maintained at a set temperature, the phenomenon of hypothermia in the perioperative period is prevented, and the operation is safer and more reliable.

The invention discloses a self-resistance electric heating intelligent incremental forming method. The method comprises the following steps that step A, a calculation model of a volume change rate (dV/dt) of a deformation area is established according to spatial geometric change characteristics of a contact area of a forming tool and a plate in incremental forming; step B, a calculation model of the resistance (Rs) and the contact resistance (Rj) of a material in the area is established according to the circuit characteristics of the contact area in the self-resistance electric heating incremental forming; step C, an instantaneous joule heat model (Q) and an equivalent contact heat conduction coefficient calculation model (K) between the forming tool and the plate contact area are established; and step D, the related parameters are substituted into a user subprogram ABAQUS-VUINTER to obtain a local deformation temperature value. According to the method, the difficulty of electricity, heat and force three-field coupling numerical simulation can be effectively solved, a simulation result is combined with forming equipment, the simulation and manufacturing integrated process is realized, and the processing efficiency and intelligence of the forming process are improved.

The invention discloses a heat distribution pipeline state parameter acquisition device based on semiconductor thermoelectric power generation. The device comprises: a thermal energy semiconductor thermoelectric power generation module, a heat conduction end, a constant voltage module, a parameter acquisition module and a communication module, wherein the thermal energy semiconductor thermoelectric power generation module comprises a cold contact surface and a hot contact surface, the cold contact surface is in contact with the environment, the hot contact surface is contacted with the heat conduction end, the heat conduction end is attached to the surface of a heat distribution pipeline or extends into the heat distribution pipeline, the parameter acquisition module is provided with a parameter acquisition detection end extending into the heat distribution pipeline, and the parameter acquisition module acquires each parameter in the heat distribution pipeline through the parameter acquisition detection end; and a communication module for sending the parameters acquired by the parameter acquisition module to an external receiving end, and the thermal energy semiconductor thermoelectric power generation module converts high-temperature heat energy in the heat distribution pipeline into electric energy and supplies power to the parameter acquisition module and the communication module. According to the invention, heat energy in a heat distribution pipeline is used for power generation, and the device is suitable for scenes where power cannot be taken and is not affected by environmental conditions.

Provided is a cooling device capable of improving bonding reliability between a base block and a heat pipe, while reducing environmental load, and capable of achieving both excellent contact heat transfer coefficient and vibration resistance. A cooling device (1) is provided with: a base block (10) having a rear surface section (10a) thermally connected to an electric component (300), i.e., a heatgenerating body; a heat pipe group (20) comprising a plurality of heat pipes (21) each having a first cylindrical section (21a), which is fixed to a front surface section (10b) of the base block (10), and which is disposed in the in-plane direction of the base block (10), and a second cylindrical section (21b), which is connected to the first cylindrical section (21a), and which stands from the base block (10); and a fin group (30) comprising a plurality of fins (31, 31, and so on) that are fixed by being aligned in parallel to each other in the standing direction of the heat pipe group (20).