31 results about "Line heat source" patented technology

The invention discloses a method of cutting force prediction and temperature prediction for end-milling cutting, the method development of the cutting force prediction is based on a milling forces prediction model of average cutting forces and a milling forces prediction model of bevel angle cutting mechanism and is characterized by performing regression calculating on the two model parameters, predicting transient cutting force, performing comparative analysis with test data, and verifying established single-tooth and multi-teeth cutting force models; the method of cutting force temperature prediction establishes a temperature field solution model of a limited long-line heat source of space optional positions and a temperature field solution model of a limited long-rotation movement line heat source of space optional positions; by means of a limited element simulation method, an embedding semi-artificial thermocouple method is put forward, and by carrying out high speed end-milling cutting temperature field distribution measurement, verification and error analysis are performed on a limited element simulation result and a theoretical calculation result. The method of the cutting force prediction and the temperature prediction of the end-milling cutting has the advantages that the method is simple, operation is easy, reference foundation is provided for end-milling cutting technology, and the method is more beneficial to production.

The invention relates to a high-precision soil thermophysical property tester for a ground source heat pump, and belongs to the technical field of energy-saving and air-conditioning. The tester consists of a filter, an electric heater, a water supplementing tank, a one way valve, a tee joint, a water circulating pump, a second ball valve and an electromagnetic flow meter which form a test pipeline. A data computation module computes soil thermophysical property parameters by adopting programs of an infinite line heat source model and a finite line heat source correcting model according to five parameters of average temperature of circulating water, initial temperature of soil, heat exchange amount of unit pipe length of a heat exchanger for an embedded pipe, flow rate of the circulating water and the depth of the embedded pipe. The tester can not only be applied to actual measurement of engineering, but also applied to researching the underground soil thermophysical property parameters when the ground source heat pump works for a long time. The tested computation result is in more accordance with the practical situation; and the tester has the advantages of compact structure, high test precision, wide test power range, high visibility degree, convenient operation and safe use.

The invention relates to a line heat source, which comprises a linear support structure, a heating element arranged on the surface of the linear support structure and at least two electrodes arranged at intervals, the at least two electrodes are electrically connected with the heating element, wherein the heating element comprises at least one carbon nanotube film, and carbon nanotubes in the same carbon nanotube film are arranged by preferred orientation along the same direction.

The invention relates to a line heat source comprising a line-shaped supporting structure, a heating element arranged at the surface of the line-shaped supporting structure and two electrodes, wherein the two electrodes are arranged at intervals and are electrically connected with the heating element, the heating element comprises at least one carbon nano pipe composite structure, the carbon nanopipe composite structure comprises a basal body and a carbon nano pipe membrane structure compounded in the basal body, and the carbon nano pipe membrane structure comprises a plurality of carbon nano pipes which are mutually wound. The line heat source can be used for manufacturing heating clothes, heating gloves or heating shoes with spontaneous heating, an electric heater, an infrared therapeutic apparatus, an electric room heater and the like and has extensive application range.

The invention relates to a line heat source comprising a line-shaped supporting structure, a heating element arranged at the surface of the line-shaped supporting structure and two electrodes, wherein the two electrodes are arranged at intervals and are electrically connected with the heating element, the heating element comprises at least one carbon nano pipe composite structure, the carbon nano pipe composite structure comprises a basal body and a carbon nano pipe membrane structure compounded in the basal body, and the carbon nano pipe membrane structure comprises a plurality of carbon nano pipes which are optimally orientated and arranged along a fixed direction or different directions. The line heat source can be used for manufacturing heating clothes, heating gloves or heating shoes with spontaneous heating, an electric heater, an infrared therapeutic apparatus, an electric room heater and the like and has extensive application range.

The invention discloses a hole wall representation temperature based simulation design method for drill hole space and belongs to the field of drill hole space design in the geothermal technology. The simulation design method is characterized in that the method comprises arbitrarily selecting four adjacent drill holes with perpendicular U-shaped buried pipes arranged inside from a drill hole group to form a four-drill-hole region, which is also called a unit drill hole group region; dividing the region into two double-drill-hole sub-regions from a horizontal direction, calculating a general formula for a transient temperature of a point M1 under a cylindrical coordinate system of the double-drill-hole sub-regions; mapping the point M1 transversely onto a vertically contacted virtual line heat source or actual line heat source to obtain the hole wall representation temperature Tb1 under the double drill holes; calculating the hole wall representation temperature Tb2 by transverse mapping of middle point M2 in the four-drill-hole region onto the virtual line heat source or the actual line heat source in the same way; setting thresholds of hole wall representation temperature change rates P1 and P2 of the double-drill-hole sub-regions and the four-drill-hole region as P1MAX and P2MAX successively; and calculating L1OPT and L2OPT in a threshold range successively through multiple times of iteration to obtain an optimal value of the drill hole space. According to the simulation design method, contradictions between the drill hole space and the heat exchanging efficiency are solved, the problem of slow calculation speed is solved under the condition that the accuracy is guaranteed, and the drill hole space and the hole wall representation temperature are balanced.

The invention relates to a line heat source comprising a line-shaped supporting structure, a heating element arranged at the surface of the line-shaped supporting structure and two electrodes, wherein the two electrodes are arranged at intervals and are electrically connected with the heating element, the heating element comprises at least one carbon nano pipe composite structure, and the carbon nano pipe composite structure comprises a basal body and a carbon nano pipe structure compounded in the basal body. The line heat source can be used for manufacturing heating clothes, heating gloves or heating shoes with spontaneous heating, an electric heater, an infrared therapeutic apparatus, an electric room heater and the like and has extensive application range.

The invention belongs to the field of mold design and evaluation, and discloses an online analysis method and equipment for an injection mold cooling system. The method comprises the following steps:carrying out model cooling analysis on a mold and a plastic part under the condition of not considering a cooling system to obtain internal factors representing the influence of the internal factors on the cooling effect of the plastic part; introducing a finite-length continuous line heat source model of a constant-temperature boundary, and calculating an external factor representing the influence of the external factor on the cooling effect of the plastic part; simulating the whole system model to obtain the cooling time of the plastic part, namely the comprehensive heat influence effect; establishing and training a neural network model of the internal factors, the external factors and the comprehensive heat influence effect; and during online analysis, recalculating the external factoraccording to the modified size and position data of the cooling pipeline, not recalculating the internal factor, and predicting the comprehensive heat influence effect by adopting the trained neural network model. The method is simple and easy to implement, and online analysis of the cooling system can be achieved.

The invention discloses a method and a device for controlling the material drying temperature of a cement production line with a waste heat power generation. The method is characterized in that the opening of a kiln head and kiln tail bypass waste gas valve is controlled by temperature measured by a temperature sensor mounted at an inlet of a kiln head and kiln tail drying system. The device mainly comprises the temperature sensor, electric louver valves and a computer control system. The temperature sensor is mounted at a drying system inlet waste gas pipeline, one electric louver valve is mounted on a kiln tail waste gas bypass, the other electric louver valve is mounted at a boiler waste gas inlet, temperature signals and valve opening given and feedback signals are accessed to the computer control system, and the computer control system controls the opening of the waste gas bypass valve according to temperature signal change. Compared with past manual adjustment, the control device has the advantages that a clinker line and the waste heat power generation are prevented from fighting over heat sources, stability of a clinker line heat source is ensured, and operation difficulty of operators is reduced.

The invention relates to a line heat source comprising a heating element and two electrodes, wherein the two electrodes are arranged at intervals and are electrically connected with the heating element; and the heating element comprises at least one line-shaped carbon nano pipe composite structure, wherein the line-shaped carbon nano pipe composite structure comprises a basal body and at least one carbon nano pipe line-shaped structure compounded in the basal body. The line heat source can be used for manufacturing heating clothes, heating gloves or heating shoes with spontaneous heating, an electric heater, an infrared therapeutic apparatus, an electric room heater and the like and has extensive application range.

This application discloses an in-situ characterization device for extremely low thermal conductivity at the nanometer scale, which is used to detect the micro-region thermal conductivity of a sample of a thermoelectric material to be tested, including: a nanoscale thermal signal in-situ excitation module for in-situ excitation Double-frequency and triple-frequency thermal signals related to the micro-region thermal conductance before and after the contact of the tested material; a nanoscale thermal signal in-situ detection module, used to realize the double-frequency and triple-frequency thermal signals In-situ real-time detection and processing, and display the in-situ characterization results of micro-area thermal conductivity; the heating frequency of the thermoelectric probe is in the range of 90Hz to 760Hz, ΔV _3ω It has a linear relationship with lnω, and according to the slope of its linear part, the thermal conductivity λ of the micro-area can be quantitatively characterized _s . This application combines the nano-detection function of the atomic force microscope, the Joule heating effect of the probe, the three-fold frequency excitation of the thermal detection and the line heat source model, and establishes an in-situ characterization device based on the atomic force microscope with extremely low thermal conductivity at the nanometer scale.

The invention discloses a heat conducting plate mainly composed of an upper metal plate, a lower metal plate, a working medium and a liquid filling pipe. The upper metal plate and the lower metal plate are rectangular flat plates identical in size. After the upper metal plate and the lower metal plate are arranged in a vertically aligned manner, the peripheral edges of the upper metal plate and the lower metal plate are sealed through welding, then a metal shell is formed, and reinforcing points are welded at the middle position so that the strength of the shell is improved. A communicating channel shaped like a Chinese character 'jing' is etched on the inner surface of the upper metal plate and enables the work medium to flow, and the whole metal plate shell can be filled with the work medium in a one-off manner. The liquid filling pipe penetrates through the side face of the metal shell to communicate with the communicating channel shaped like the Chinese character 'jing', and therefore vacuumizing and work medium filling are convenient. The heat conducting plate has the advantages that the heat conducting plate has isotropy in the heat transfer directions, and the heat conducting plate can be used for heat dissipation of a point heat source, a line heat source and a face heat source; a manufacturing technology is simple, and mass production can be conducted; and the heat conducting plate can be produced into different shapes so as to adapt to cooling components. The heat conducting plate can be widely applied to heat dissipation of electronic products or constant-temperature heating of food or chemical equipment and can also be used as a heat exchanger.

The invention discloses an analytical model for measuring the flow velocity of underground water by heating distributed optical fibers through pulses, which is characterized in that the distributed optical fibers are buried in a water-containing medium, the magnitude and the direction of the seepage flow velocity are quantitatively determined through the difference of the optical fiber cooling process, and a convective heat transfer analysis model of the seepage field is deduced under the action of a continuous linear heat source, wherein the model is more suitable for the heat transfer problem of the optical fibers buried in the porous medium. Model calculation results show that if the optical fibers are continuously heated, long heating time is needed when the temperature of the opticalfibers reaches the maximum temperature rise, so that more energy is consumed, a theoretical model for quantitatively calculating the flow velocity of underground water by adopting a thermal pulse-timedomain reflection technology is constructed, and a double-optical-fiber thermal pulse method and a four-optical-fiber thermal pulse method are provided. That is to say, after thermal pulses are injected into a heating element, the flow velocity of underground water can be conveniently calculated and the flow direction of the underground water can be determined by utilizing difference values or ratios of optical fiber temperature measurement data at different positions.