15 results about "Thermal resistance" patented technology

The invention relates to the technical field of low temperature measurement, and especially relates to a method and device for quickly decreasing temperature. The method comprises the steps: enabling a cold head and a temperature control object to be separated through a thermal resistor device, employing the cold head of a refrigerating machine for accumulation of cold, thereby achieving the big temperature difference between the cold head and the temperature control object, achieving the cooling speed which is higher than the cooling speed which is achieved through the cooling capability of the refrigerating machine, and achieving the quick decreasing of temperature. During the quick decreasing of the temperature, the fine tuning is carried out through a heating device, thereby achieving the temperature decreasing at a constant speed. The invention proposes a method for achieving the temperature decreasing at the constant speed through employing the refrigerating machine. Compared with a liquid helium system, the system is simple in structure, and reduces a plurality of control valves and pipes. The system is low in cost, and has no other cost except some power supply needed in a process. Moreover, the system flexibly changes the cooling speed through controlling the start/stop of the refrigerating machine and the heating device, is stable, reliable and controllable in cooling speed, and can achieve the automatic control. The system is very good in linearity of temperature increase and decrease. Compared with the liquid helium system, the system is stable in temperature increase and decrease speed.

The invention discloses a method for preparing a micro-system radiating device, which is characterized by comprising: a first step of preparing a carbon nanotube array on a growth substrate; and a second step of depositing a metal anchored zone on the free end face of the carbon nanotube array, wherein the metal anchored zone consists of a plurality of layers of metals; the surface of the metal anchored zone abutted on the free end face of the carbon nanotube array is provided with a metal soakage layer; and the other parts of the metal anchored zone are provided with highly-heatconducting metals so as to obtain the micro-system radiating device. In the method, the metal soakage layer reacts with nanotubes to form metallic carbonates, so that better transitional crystal structures can be formed between the metal soakage layer and the nanotubes; and compared with a wet interface between the metal soakage layer and the carbone nanotubes, the transitional crystal structures can reduce the scattering of hot carriers, such as phonons, electrons and the like, thereby further reducing thermal contact resistance between the carbon nanotubes and a heat source.

A liquid ejection apparatus includes a plurality of liquid ejection heads each comprising a channel member having a plurality of ejection openings, a plurality of channels communicated with the plurality of ejection openings, and a heat body, and a plurality of radiators each provided for each of the plurality of liquid ejection heads. The liquid ejection apparatus further includes a plurality of temperature sensors each provided for each of the plurality of liquid ejection heads and outputting a signal indicating a temperature of the channel member, a heat-resistance change device changing a heat resistance between one of the plurality of radiators and one of the plurality of liquid ejection heads corresponding to the one of the plurality of radiators, and a controller controlling the heat-resistance change device based on the signal outputted from at least one of the plurality of temperature sensors.

The invention discloses a test system of a temperature sensor. The test system comprises a computer, a thermoelectric couple and thermal resistance tester, and a temperature sensor test platform, wherein the computer is connected with the thermoelectric couple and the thermal resistance tester through a serial port line; the temperature sensor test platform comprises a plurality of sample fixture sockets, a plurality of ohm gauge measuring openings, a self-setting control key, a computer serial port and an ohm gauge communication serial port; the sample fixture sockets, the ohm gauge measuring openings, the self-setting control key and the ohm gauge communication serial port are respectively connected with the computer through serial port lines; the temperature sensor test platform works according to the following steps of: (1) powering on and detecting; (2) setting; (3) measuring; and (4) matching. According to the test system disclosed by the invention, a multi-position automatic switchover measurement of the samples is realized and the whole switchover and measurement process is automatic, so that the work efficiency is improved, the production cost is reduced and a test result is visual and precise.

The present disclosure includes a compressor for use with an air-conditioner. The compressor includes a motor having a stator and a rotor. A compressing portion intakes gas, compresses gas and discharges gas. The compressor includes a protector located near the motor. The protector is connected in series to the circuit of the motor stator coil. The protector has a temperature sensitive element that trips the protector in response to the temperature sensitive element being heated to a predetermined drive temperature. A thermal resistance heater connects in parallel to the temperature sensitive element. The compressor can be includes with an air-conditioner, having an evaporator, a condenser, a throttling member and the compressor.

The invention relates to a preparation method for improving thermal shock resistance of double-ceramic-layer TBCs. The method includes the following steps that pretreatment of powder materials is carried out; pretreatment of high temperature alloy base materials is carried out to obtain a bonding layer; a plasma spraying method is adopted for sequentially spraying YSZ powder and A2B2O7 powder to the bonding layer, and double-ceramic-layer thermal barrier coatings are obtained; and a laser remelting method is adopted for conducting remelting treatment on the double-ceramic-layer thermal barriercoatings in the third step, and finally the double-ceramic-layer TBCs with the thermal shock resistance are finally obtained. By means of the preparation method, the thermal shock resistance of the double-ceramic-layer TBCs is improved, and the high temperature service life of the double-ceramic-layer TBCs is greatly improved.

The invention relates to a composite material for a ceramic sealing ring and a preparation method thereof, relates to a composite material and a preparation method thereof, and is used for solving the problems that the traditional ceramic sealing ring does not have the characteristics of corrosion resistance, wear resistance, low friction coefficient and thermal impact resistance. The first scheme is as follows: the composite material is composed of 5-15 parts of graphite, 80-90 parts of silicon carbide and 5 parts of silica fume by volume. The second scheme is as follows: the preparation method comprises the following steps: (1) uniformly mixing graphite powder and silicon carbide powder in a ball milling tank; (2) pressing in a steel mold to obtain powder green compact of the sealing ring, wherein the pressure is 150-200 MPa; (3) infiltrating the powder green compact in molten silicon liquid for 1-3 hours, applying 0.5-10 MPa argon gas pressure on the surface of the molten silicon liquid during the infiltration process, and taking out infiltrated powder green compact; and (4) sintering the powder green compact in a sintering furnace at the temperature of 1700-1800 DEG C for 2-5 hours. The composite material is used for manufacturing the sealing ring.

The present application provides a draft tube of crystal growing furnace and the crystal growing furnace. The draft tube comprises an inner tube, an outer tube and a thermal insulating material sandwiched between the inner tube and the outer tube, wherein the inner tube has a thermal resistance lower than that of the outer tube. Accordingly, the outer tube having the higher thermal resistance reduces the heat transfer from the outer tube to the inner tube, thereby the temperature of the inner tube can be reduced, the heat radiation from the ingot surface to the inner tube can be enhanced, and the vertical temperature gradient of the ingot can be increased. At the same time, the temperature of the outer tube increases to reduce the condensation of silica vapor (SiOx) evaporated from the silicon melt surface, thereby impurity formation and dislocation defect caused by the SiOx fallen into the silicon melt can be prevented.

The invention discloses a safe pressure relieving and anti-creeping device for a water heater. The safe pressure relieving and anti-creeping device comprises a valve and a pipe. A water inlet channeland an outer pressure relieving channel are formed in the valve, and an inner relieving valve assembly used for balancing the pressure in the water heater is arranged in the water inlet channel. An outer relieving valve assembly used for water heater over-pressure protection is arranged in the outer pressure relieving channel. A water pipe plug matched with the pipe is arranged at the top end of the pipe, and the pipe and the water pipe plug are made of isolating materials. The main purposes of the safe pressure relieving and anti-creeping device are that the valve and the pipe are both made of the isolating materials, the isolating materials are isolated from electricity and meanwhile are low in heat conductivity coefficient, thus the anti-creeping safe protection function is achieved, amain structure is formed through a mold, the high heat resistance is also achieved in the aspect of the material characteristic, and the purposes of energy conservation and heat preservation are achieved. Meanwhile, the safe pressure relieving and anti-creeping device is provided with the inner relieving valve assembly and the outer relieving valve assembly, thus the safe pressure relieving function is achieved, the secondary pressure relieving effect can be achieved structurally, and thus practicability of pressure relieving is enhanced greatly.

The invention discloses a composite thermal-insulating block of an expanded and vitrified micro-bead. The composite thermal-insulating block is composed of air heat-insulating layers, a light padding heat-insulating layer and a bearing course, wherein the bearing course is prepared by a thermal-insulating material of the expanded and vitrified micro-bead; the two layers of air heat-insulating layers are symmetrically arranged; the two layers of air heat-insulating layers adopt a multi-cavity staggered structure; the light padding heat-insulating layer is arranged at the middle part, and the light thermal-insulating padding is filled in the light padding heat-insulating layer. The composite thermal-insulating block has the advantages that the thermal resistance of the composite thermal-insulating block is greatly improved by selecting different light padding heat-insulating layer materials and correspondingly changing the size; the energy-saving requirements of different areas are met; the building energy conservation is really achieved; the service life of the composite thermal-insulating block is the same as that of the building; and the bearing course adopts an incombustible material micro-bead as a lightweight aggregate, so that the fireproofing grade A of the composite thermal-insulating block is ensured, and fire hazards are reduced.

The invention provides a preparation method of an ablation-resistant low-thermal-conductivity composite material. The heat insulation layer is prefabricated into the mode that the ablation-resistant layer and the heat insulation layer are alternately compounded, and the ablation-resistant layer serves as a functional layer in direct contact with a propellant, can bear the high temperature of 2000 DEG C or above and can effectively resist thermal oxygen erosion and high-speed solid-phase particle scouring; the thermal insulation layers and the ablation-resistant layers are alternately stacked, on one hand, the number of alternate layers is increased, the thickness of a single layer is reduced, fibers with the large length-diameter ratio are oriented in the ablation-resistant layers to generate a fiber densification effect, and therefore the anti-scouring performance of the ablation-resistant rubber material is improved; the heat insulation layers and the ablation-resistant layers are alternately arranged, so that a heat conduction channel formed by the high-heat-conduction fibers in the thickness direction of the heat insulation layers can be cut off, meanwhile, the interface heat resistance can be increased by increasing the number of the alternate layers, and therefore the heat insulation performance of the material is improved.