85results about How to "Small temperature error" patented technology

The invention relates to a temperature conversion method and a low-power high-precision integrated temperature sensor. The low-power high-precision integrated temperature sensor is composed of a band gap reference circuit with a sensing core, a positive and negative synchronous switch capacitor integral circuit, a current source and a sampling capacitor dynamic element matching module, a clock generating circuit, a divider and buffer circuit and a fully differential analog-to-digital converter. The sensing core circuit in the traditional technology and the band gap reference circuit are combined and integrated, so that the circuit structure is simplified; the current source dynamic element matching module is arranged and thus a base-emitter junction voltage difference in proportion to the absolute temperature is generated, wherein the polarity of the voltage difference changes alternately; with the novel positive and negative synchronous switch capacitor integral circuit, the improved temperature conversion function is completed and the dynamic range utilization rate of the analog-to-digital converter is improved; dynamic element matching is carried out on the sampling capacitor, thereby improving the integral accuracy; and the analog-to-digital converter is used for carrying out quantization processing on an effective temperature signal to provide a digital output. Therefore, the temperature error and circuit power consumption of the sensor can be effectively reduced; and the method and the sensor are suitable for the low-power high-precision temperature sensing application.

The present invention relates to a superplastic forming method for the titanium plate specially used for the plate type heat exchanger, which belongs to the field of mechanical processing technology. The present invention comprises the following steps that spongy titanium is chosen to be the melted raw material; the spongy titanium is placed in a vacuum plasma smelting furnace to be directly cast into plate base; the plate base forms a plate of a thickness of 2.0 to 2.4 mm after the process of heating, hot rolling, acid and alkali washing; second heating, hot rolling and acid and alkali washing and annealing; the plate of a thickness of 2.0 to 2.4 mm after the annealing in the vacuum smelting furnace forms a titanium plate of a thickness of 0.5 to 0.6 mm after the process of cold rolling, cleaning, second annealing and cold rolling, acid and alkali washing and third annealing. The present invention adopts the process that the spongy titanium which contains oxygen, iron and nitrogen of comparatively high content is directly processed into the titanium plate base in the plasma smelting furnace and directly rolled into the plate without forging and pressing.

The invention relates to a construction detection used in the hanger rod exchange of middle and lower arc bridges. The invention comprises that building arc bridge spatial reference limit model, analyzing the force state of bridge, simulating the whole construction, the construction uses arc bridge three-dimension position detection, bridge sink detection, displacement detection between arc rib and beam, hanger rod force detection, structural stress detection and long-time detection, then comparing the data of detection with the reference limit model, to correct the model, to be used in next reference limit model. The invention can confirm the flexibility less than theory value and confirm the hang force in design range, to improve safety or the like.

The invention relates to a self-tuning PID energy-saving temperature control method. The method comprises the steps that a target temperature value, a control period, a sampling period and a thresholdtemperature difference are set first; load heating power is increased; the current regional temperature sampling value of a controlled object is acquired, and the sampling period is combined to calculate the temperature rise rate; a PSO-DE algorithm combining particle swarm optimization (PSO) and differential evolution (DE) is used to adjust and calculate PID control parameters; the duty cycle ofthe output pulse of a control period is adjusted according to the operation result; heating power output is adjusted, so that the sampled temperature sampling value is approximately equal to the actual temperature value of the controlled object; a temperature error caused by the heating inertia is reduced; heating power is accurately controlled; and the energy saving effect is obvious. A self-tuning PID energy-saving temperature control module comprises the self-tuning PID energy-saving temperature control method, can accurately control the heating power, and has an obvious energy-saving effect.

The invention discloses a strip-shaped jacketed oil-heat roller, which comprises an inner pipe, an input shaft, an end cover, a partition plate, an inner cylinder, an outer cylinder, a strip, an inner ring plate, a ventilating pipe, a supporting shaft and a connecting pipe, wherein the input shaft is a hollow shaft, the jointing end of the input shaft and the connecting pipe is provided with a left radial hole and a right radial hole, and the inner pipe is inserted into the inner hole of the input shaft and connected with a step by crossing the left radial hole to form a bidirectional independent channel. The jointing end of the supporting shaft and the connecting pipe is provided with an axial blind hole channel which is communicated with the radial holes. The inner cylinder is connectedwith the input shaft and the supporting shaft through the inner ring plate, the baffle plate and the end cover; and a strip-shaped groove consisting of the strip is arranged in a jacket between the inner cylinder and the outer cylinder, and is communicated with an oil inlet cavity, an oil return cavity and the bidirectional independent channel through oil inlets at two ends of the wall of the inner cylinder and an oil return hole at one end of the wall of the inner cylinder. The strip-shaped jacketed oil-heat roller ensures that the error of a temperature on the surface of the roller is less than 5 DEG C through bidirectional equivalent heat exchange, thereby improving product quality. The invention is suitable for being matched with various specifications of rollers.

The invention discloses a non-consumable electrode arc hot wire additive manufacturing wire temperature detection control method and device; the device comprises a temperature acquisition control device, a hot wire power supply and a welding power supply, and the temperature acquisition control device comprises an infrared temperature sensor, a hot wire temperature acquisition instrument, a hot wire temperature control instrument and a display. The infrared temperature sensor is fixed to a non-consumable electrode welding gun and connected with the display through the hot wire temperature acquisition instrument , and the hot wire temperature control instrument and the display are both connected with the hot wire power supply. The method has the following steps: comparing a difference deltaT' between a preset temperature T0 and the acquired temperature T1 with a preset difference delta T in the display via the hot wire temperature control instrument, and adjusting the heating current of the hot wire power supply in time to stabilize the heating temperature of the wire at the preset temperature; according to the method and device, the stable detection and control of the wire temperature in the plasma arc hot wire additive manufacturing process can be realized, and the stability of a stacking process and the forming size precision and quality of an additive member are effectivelyimproved.

The invention provides a heat convection testing method and a system for a composite insulator including an artificial defect. The testing method comprises the steps of fixedly embedding a temperature measuring probe in the composite insulator and enabling the temperature measuring probe to be located on the junction face of a silicone rubber sheath and an epoxy resin core rod; adopting a direct current constant voltage source to perform power supply for the resistance defect of the composite insulator; utilizing the temperature measuring probe to perform real-time detection on the internal temperature of the composite insulator in the power supply process, recording the internal defect temperatures under different currents and using an infrared temperature measurement device to shoot and record the surface temperature distribution situation of the composite insulator; and performing compilation and analysis on recorded data to obtain the relation of the outer surface temperature rise and internal actual temperature rise of the composite insulator. The temperature measuring probe improvable in temperature and a special fixing method are adopted, reliable connecting strength, insulating strength and heating power can be achieved, and the measurement accuracy is finally ensured.

The invention relates to a pressure sensor with double redundancies and high reliability, which comprises a pressure conversion joint, two silicon pressure sensitive cores, two compensation circuits of the silicon pressure sensitive cores, two electric signal amplification processing boards, a stainless steel shell, an electric connector and potting silica gel, wherein the two silicon pressure sensitive cores are welded in the pressure conversion joint; the two compensation circuits of the silicon pressure sensitive cores are respectively connected with the two silicon pressure sensitive cores through connecting cables; the two electric signal amplification processing boards are respectively connected with output signals of the two compensation circuits of the silicon pressure sensitive cores; processing signals of the electric signal amplification processing boards are transmitted out from the aerial electric connector through the output ends of the circuits; the pressure conversion joint, the stainless steel shell and the aerial electric connector are welded into a whole body; and the silica gel is potted in the whole body. The invention has the advantages of small volume, light weight, full stainless steel watertight structure, pressure resistance, salt mist prevention, electromagnetic interference resistance, overpressure impact resistance, high frequency response, high comprehensive precision, small temperature error and the like.

The invention relates to a temperature control system comprising a temperature measuring circuit, a control circuit, and an execution circuit. The temperature measuring circuit is used for carrying out periodic measurement on a temperature of a target object, generating a voltage signal, and outputting the signal. The control circuit connected with the temperature measuring circuit is used for receiving the voltage signal, obtaining a current temperature value of the target object based on the voltage signal, and setting heating time based on a preset target temperature value and the current temperature value, wherein the heating time is less than or equal to a measurement period of the temperature measuring circuit. The execution circuit connected with the control circuit is used for controlling a heating device to carry out heating according to the heating time, thereby realizing temperature adjustment of the target object. The temperature control system can detect the temperature of a target object periodically and set the conduction time of the heating device within the measurement period based on the detection time, thereby realizing temperature adjustment. The output is adjusted correspondingly with the temperature change of the target object, so that the temperature adjustment precision is improved and the temperature error is reduced.

A force-thermal coupling and loading system for superconducting materials under an ultra-low varying temperature environment comprises a testing machine, a refrigerator, a heating unit and a temperature control unit, wherein the testing machine is an electronic universal testing machine; the electronic universal testing machine uses a cooled cryostat which is in a double vacuum mode; the inside of the cooled cryostat is connected with a vacuum pump through a vacuum pipe assembly; an observation window is further formed in the front of the cooled cryostat; the refrigerator is mounted on the back of the cooled cryostat; refrigeration is carried out in a multi-stage refrigerating head mode; the heating unit comprises a heater, a temperature controller and a temperature sensor; and the temperature control unit comprises an intelligent PID (proportion integration differentiation) regulating and controlling unit, a central arithmetic unit and a human-machine interface (HMI). The force-thermal coupling loading system can be used for testing the performance of the superconducting materials under the ultra-low or varying temperature environment, and has the advantages of large temperature range, small temperature errors, good testing precision, high stability and good simplicity in operation.

The middle of amorphous alloy thin strip heaves to one side and forms arch bridge type magnetic pole of a kind of amorphous alloy strain gauge. The bridge of magnetic pole parallel winds along the body of amorphous alloy thin strip and the height of heave is h, 0<h<0.5mm.There are excitation loop and measure loop enlace on the pole side by side and the magnetic field intensity is 0.01-0.05A/mm of the excitation loop. The amorphous alloy strain gauge adheres strongly on surface to measuring material so it takes distortion with measuring work piece along the portrait at the same time. It arouses the change of iron core magnetism conductance and inductance value to finish the test of piece. It utilizes well soft magnetism characteristic and steady temperature capability of amorphous alloy, so it is fit for testing tiny force and displacement with high testing sensitivity. Its temperature error is small and testing circuit is easy to be used in abominable condition with long using life.

The invention provides a system for realizing 3D printing of a high-molecular material by a picosecond laser. The system comprises a laser system, a control system, an infrared temperature measuring device and a feeding device. Temperature difference with the latest 3D printing job temperature is compensated through calibration, feedback and laser power control. The temperature difference can be accurately controlled within +/- 0.5 DEG C. The high-molecular material can be effectively prevented from warping and nonuniform processing phenomena during 3D printing process.

The invention provides an optical fiber ring for optical fiber gyros. The optical fiber ring comprises a optical fiber sensitive ring, a magnetic shielding film, a heat storage layer, a magnetic shielding case and a thermal insulation layer which are sequentially arranged from inside to outside. The magnetic shielding case comprises a magnetic shielding base and a magnetic shielding cover laminated on the magnetic shielding base. The magnetic shielding case is a closed structure. A pigtail of the optical fiber sensitive ring sequentially penetrates through the magnetic shielding film and the magnetic shielding case to be connected with a Y waveguide pigtail of an optical fiber gyro system. The heat storage layer is composed of a heat storage material. The invention further provides an optical fiber ring processing method. According to the optical fiber ring for optical fiber gyros and the optical fiber ring processing method, by adopting the wrapping method for the optical fiber sensitive ring as well as the heat storage layer and the heat insulation layer on the structure, the influence of the temperature on the fiber sensitive ring is reduced, and the gyro temperature performanceis improved. The magnetic shielding film and the magnetic shielding case are combined to form a double-layer magnetic shielding structure, so that the influence of the external magnetic field on theoptical fiber sensitive ring is effectively reduced, and the environment adaptability of the optical fiber ring on the temperature and the magnetic field is improved.

The invention relates to a novel stirring tank. The stirring tank comprises a tank body, a tank cover, a feeding opening, a discharging opening, a drain outlet, a stirring shaft, a bearing, a sleeve, stirring teeth, a scraper, a clamping sleeve, heating liquid or cooling liquid inlet, a heating liquid or cooling liquid outlet and a temperature controller, wherein the stirring tank is configured to drive the stirring teeth and the scraper connected to the stirring teeth to rotate so as to stir the materials through the stirring shaft connected to the bearing and remove material liquid adhered to the tank wall during stirring; the temperature of the material liquid can be well controlled in a small range through the cooperation between the temperature controller and the clamping sleeve. Through the stirring tank disclosed by the invention, the stirring process is optimized, simultaneously the waste and degeneration of the materials are avoided and the production efficiency and the product quality are improved.

The invention discloses a polyethylene corrugated pipe and an expansion molding process thereof, and relates to the field of plastic pipeline molding methods. According to key points of the technicalscheme, the expansion molding process includes the following steps that S1, the corrugated pipe is fed onto an expansion mold; S2, the flaring end is heated by an annular far-infrared heating part; S3, heating does not exceed the critical temperature of melting, and after softening, the end needing to be expanded is flared through the expansion mould; S4, cooling molding is conducted; S5, air is fed into the inner wall of the pipe through an air blowing system in a contact adsorption state; and S6, demolding is conducted. The polyethylene corrugated pipe and the expansion molding process thereof have the technical effects that 1, the annular far-infrared heating part is used for heating, heating equipment with glycerin used as a heating medium is avoided, and thus the situations that the glycerin is mixed with water inevitably, the decomposition temperature of the glycerin is lowered, and a large amount of smoke is produced to pollute the environment are avoided; and 2, by changing theheating form and controlling the temperature difference, the axial shrinkage ratio of the corrugated pipe is well controlled, use of the large heating equipment is avoided, and 50% of electricity issaved compared with the large heating equipment.

The invention relates to the field of automobiles, in particular to an accurate positioning method for an automobile. The accurate positioning method for the automobile includes the steps that a standard barometric pressure value and a common temperature range are selected; then all values corresponding to temperature and ultrasonic velocity are obtained within the common temperature range through an experiment under the standard barometric pressure value; then the temperature and the ultrasonic velocity are fitted to obtain a temperature and speed function relation; finally, signals of ultrasonic sensors and a temperature sensor are transmitted to a vehicle-mounted controller, the vehicle-mounted controller works out current ultrasonic velocity through the temperature and velocity function relation according to the signal of the temperature sensor, and then the signals of the ultrasonic sensors are combined with the current ultrasonic velocity to obtain the distance between the installation position points of the ultrasonic sensors and the position of an obstacle. The distance from the obstacle can be detected more accurately through the ultrasonic sensors, alarm sound can have more features, a better function can be achieved, the distance from the obstacle can be directly displayed on a displayer inside a vehicle, and therefore a driver learns about the position of the obstacle more visually.

The invention relates to a tester for rapidly testing a heat-insulating property of a fabric, and belongs to the technical field of textile measurement. The tester mainly comprises two heating plates,a temperature acquisition and control module and an air flow generation module, and the two heating plates are placed on the same horizontal plane. The tester for rapidly testing the heat-insulatingproperty of the fabric is reasonable in structure and convenient to operate and use. By the tester for rapidly testing the heat-insulation property of the fabric, the heat-insulation property of the fabric can be tested rapidly, the heat-insulation index of the fabric can further be tested in an open environment, and the theoretical basis is provided for researching and evaluating heat transfer performance indexes of the fabric.

The invention relates to the technical field of hair dryers, and discloses a constant temperature control method of a hair dryer. The hair dryer comprises an air duct, a handle and a self-heating body, the resistance value of the self-heating body changes along with the change of the temperature of the self-heating body, and the self-heating body is arranged in the air duct. A fan, a motor and a heating wire are arranged in the air duct. A main board is arranged in the handle, and a temperature detection circuit, a control unit and a power control circuit are arranged on the main board. The temperature detection circuit measures the resistance value of the self-heating body and feeds back a resistance value signal to the control unit, and the control unit controls heating of the heating wire through the power control circuit according to the received resistance value signal so that air blown out of the air outlet of the air duct can be in a constant-temperature state. Through the powercontrol circuit, heating of the heating wire can be controlled, and air blown out of the air duct is in a constant-temperature state. The self-heating body is arranged in the air duct and deviates from the high-temperature environment of the air outlet, installation is convenient and time-saving, the temperature error of the self-heating body is small, the feedback sensitivity is high, and high-precision constant-temperature control over the hair dryer is achieved.

The invention relates to an experiment apparatus used for researching reaction of fine ore during motion. The experiment apparatus comprises a tubular vertical furnace, a reacting furnace pipe is arranged in a hearth of the tubular vertical furnace, a filling tube is stretched into the reacting furnace pipe from the top of the tubular vertical furnace in a slide and sealing mode, a discharge hatch is movable at the position in the reacting furnace pipe; a material receiving pipe is stretched into the bottom of the tubular vertical furnace in the slide and sealing mode, a material receiving port is movable at the position in the reacting furnace pipe; a constant-temperature area with adjustable position and/or length is provided between the discharge hatch and the material receiving port, the ore powder is introduced into the constant-temperature area through the discharge hatch of the filling tube, and then is introduced into the material receiving pipe through the material receiving port after being reacted. The ore powder is subjected to a reaction during a movement process in the constant-temperature area, the temperature difference of the constant-temperature area is little through adjustment and selection.

According to the invention, the body temperature of a human body can be accurately measured within 3.5 minutes at the soonest; and the matching degree of monitoring data and real data is high in continuous monitoring use process. According to the body temperature continuous monitoring method and the dual-temperature-measurement body temperature patch, the controller starts to collect and store thetemperature information uploaded by the main temperature sensor at set intervals in the set time; and the controller compares and judges a temperature rise curve formed by each temperature information value acquired within a set time with each group of standard temperature rise curves pre-stored in a database. The invention has the advantages that: 1, double temperature sensors are adopted, the main temperature sensor monitors the temperature of the oxter epidermis, and the auxiliary temperature sensor assists in monitoring the temperature of the oxter gap and is used for calibrating the temperature error caused by the main temperature sensor due to non-clamping, so that the temperature measurement precision of the invention is improved;.

The invention provides a sensor circuit, a corresponding system and a method. A circuit includes a first current source configured to produce a first current in a first current line through a first diode-connected transistor having a voltage drop across the first diode-connected transistor, the first current being proportional to an absolute temperature via a first proportionality factor; a secondcurrent source configured to produce a second current in a second current line through a second diode-connected transistor having a voltage drop across the second diode-connected transistor, the second current being proportional to the absolute temperature via a second proportionality factor; a third current source configured to produce a third current in a third current line through a third diode-connected transistor having a voltage drop across the third diode-connected transistor; and a processing network including a sigma-delta analog-to-digital converter, the processing network being coupled to the, the second, and the third diode-connected transistors.