47results about How to "Stable temperature gradient" patented technology

The invention relates to a method for preparing a thermoelectric device and a thermoelectric device, and provides a method for preparing a thermoelectric device. The method comprises the following steps: (a) providing a large number of thermoelectric material sheets or thermoelectric component sheets, wherein each sheet has at least one predetermined shape; (b) arranging the thermoelectric material sheets or thermoelectric component sheets into a predetermined combination, and connecting the thermoelectric material sheets or thermoelectric component sheets to form a thermoelectric material section or thermoelectric component section; (c) repeating step (b) to produce a large number of sections; and (d) connecting the large number of sections to produce a predetermined configuration for thermoelectric devices. The invention further provides a thermoelectric device.

The invention relates to a testing system for deep soil freezing / thawing process, which is structurally characterized in that a temperature-controlled box is connected with an external cold bath; a high pressure-resistant organic glass cylinder is arranged on a temperature-controllable steel base; two small holes are formed in the base, one is connected with a water guide pipe, and the other is connected with a pressure adjusting pipe; a permeable stone, a piece of filter paper and a sample are sequentially arranged at the upper part of the lower base, and a temperature sensor is mounted in the sample; a temperature-controllable upper press head is arranged at the upper part of the sample; a line leading-out hole is formed in the upper press head, and is sealed through sealant after the line is lead out; the upper press head is connected with the transmission rod of a testing machine; a measuring cylinder is connected with the sample through the water guide pipe; and the measuring cylinder is arranged on a weighing sensor and fixed through a bracket. By adopting the testing system, the freezing / thawing process of the deep soil can be rather systematically researched, so as to obtain the frost heaving rate and the water absorbing / draining rate of the deep soil which is in different depths frozen under the different temperature gradients. The testing system provides the technical guarantee for the research in clarifying the action of the external load on the forming processes of the freezing soil and the frozen soil cold-formed structures, and the mutual action of the temperature, the moisture content and the pressure of the soil body in the process of freezing under the high-pressure action.

The invention provides a method and a device for coaxial combined machining with tubular electrode discharging and laser irradiation, and belongs to the field of non-traditional machining and combined machining. Micro-etching machining is performed on the surface of an insulating high-hardness brittle material by virtue of a coaxial action of cone-shaped tube electrode discharging and laser irradiation, recessive material defects and stress concentration generated by pulsed laser acting on the surface of a workpiece can attract spark discharge to always act on the current area, and meanwhile, the spark discharge changes the surface shape and physico-chemical property of the current area, then nonlinear absorption of the current area on laser energy is improved, a local field enhancement effect is generated, and pulsed laser focused irradiation can accelerate an electrochemical reaction to promote generation of a stable discharge gas film layer on the surface of a hollow tool electrode; and the interactive cooperation of two types of energy achieves fixed-area micro-etching of the insulating high-hardness brittle material, the machining efficiency is significantly improved, and the machining quality is improved.

The invention relates to a dust removing method in the production process of metallurgical pellets, in particular to a dust removing system of a chain grate machine tail part. The dust removing system comprises a chain grating machine tail part mechanism with a chain grate machine wheel and a chain grate machine tail wheel return device; the dust removing system is characterized in that a machine tail seal cover is arranged on the chain grate machine tail part mechanism; chain grate machine tail wheel return segment dust removing devices are arranged on the upper part of the machine tail seal cover; an overall chain grate machine tail dust removing device is arranged in the middle part of the machine tail seal cover; and a tail sealing wind box dust removing device of the chain grate machine is arranged at the end part of the lower return of the chain grate machine tail. According to the dust removing system provided by the invention, as the chain grate machine tail wheel return segment dust removing devices are arranged at the three main dust-raising spots of the chain grate machine tail mechanism, and are connected with external exhaust fans by pipelines, thereby forming a negative pressure environment; the three dust removing systems are compensated to one another and are linked with one another, so that the high temperature waste gas can be effectively prevented from overflowing, the tail machine environment of the chain grate machine workshop can be improved, the service life of the heat resistant parts of the equipment can be ensured; and moreover, the temperature gradients of the materials are smoothed, and the mine return quantity of the cured pellets can be reduced.