31results about How to "Equilibrium temperature difference" patented technology

The invention provides a phase change composite, a preparation method and an application. The phase change composite is prepared from paraffin powder, expanded graphite powder, polyethylene particlesand SEBS. By adopting a material system in a special ratio, the defects that the conventional phase change energy storage material is low in thermal conductivity and required to be encapsulated in practical use to prevent leakage are overcome, thermal management efficiency is increased greatly, and popularization and application range of the phase change energy storage material is expanded.

A piston for the crosshead engine, in particular a piston is used for a large two-cycle diesel engine and is provided with a piston upper part (2) mounted to an upper flange (9) of a piston rod (1). The piston upper part is provided with the piston crown (3) connected to a piston skirt (4) annularly surrounding the periphery, and the piston crown covers the central cooling chamber (8). In this chamber (8), coolant can be injected via a supply line (10) arranged inside the piston rod (1), and can be carried away via a return line (11) provided outside in the radial direction of the line (10). Provided is a highly reliably cool a piston crown, in a piston provided with the piston crown having a rising center or with a cooling chamber formed to have an inserting body (17). The inserting body (17) has opposite inner nozzle (21) connecting to the supply pipelines (10) pointing to the piston crown (3) enclosed by an annular cell (22) which is formed into a coolant collecting chamber.

A quenched core mold and quenching method for a cylindric steel thin-wall component are disclosed. The quenched core mold includes a mold body. The radial dimension of an external circular surface ofthe mold body is designed as an inner-pore radial dimension before drying of the component, thus ensuring that a heated inner hole expands and the component is put into the mold body successfully during component quenching heating, and ensuring that the component tightly clamps the mold body after quenching. The external circular surface of the mold body is provided with a plurality of axial through slots which are disposed axially, bidirectionally cut-through, and used for allowing quenching oil to flow through, preventing contraction crack of the component during quenching, and assisting component demolding. The plurality of the axial through slots are equally spaced along the periphery direction of the mold body to form a uniform saw-toothed external circular surface. Slot bottoms of the axial through slots corresponding to end surface wide edges of the component are provided with axially-through wide-edge cooling slots used for increasing the flux of the quenching oil to cool the end surface wide edges of the component. Inner hole and planarity deformation of the component is reduced during quenching to allow dimension deformation of the component to be controlled in a reasonable range.

The invention relates to a Wheatstone bridge and a multi-dimensional force sensor. The Wheatstone bridge comprises four bridge arms, each bridge arm comprises a plurality of resistors, the number of the plurality of resistors in each bridge arm is the same, the reference resistance values of the plurality of resistors are the same, the plurality of resistors in each bridge arm adopt a preset series-parallel structure, and in the preset series-parallel structure, the equivalent resistance value of the plurality of resistors is equal to the resistance value of a single resistor. The plurality of resistors are used for balancing the temperature difference of single resistors. A single-resistor bridge arm is replaced by a mode that a plurality of resistors form a bridge arm according to a preset series-parallel structure, and on the basis of not changing the original output characteristics of the circuit, a plurality of resistors with the same or similar temperature characteristics are used for hedging, so that the individual temperature difference is balanced. Therefore, the influence of the resistance value difference of the bridge arm resistor caused by the temperature change on the differential output signal of the Wheatstone bridge is reduced, and the technical problem that the resistance value and temperature difference of the strain gauge of the Wheatstone bridge greatly influences the differential output signal is solved.

The invention discloses an arc-triangle-shaped powder metallurgy brake pad for a high-speed motor train unit. The arc-triangle-shaped powder metallurgy brake pad for the high speed motor train unit comprises a steel back and friction blocks arranged on the steel back, the friction blocks are in the shape of an arc triangle with a straight edge, and the arrangement number of the friction blocks onthe brake pad is increased from an inner ring to an outer ring in sequence. Compared with the prior art, the arc-triangle-shaped powder metallurgy brake pad has the positive effects that 1, for the unique arc triangle structure with a round hole in the middle, the total side area is larger than that of other structures, the heat dissipation effect is good, and the brake temperature can be effectively reduced; 2, the reasonable arrangement of the positions of the friction blocks is realized, compared with other arrangement modes, the temperature difference between friction bodies of the inner ring and friction bodies of the outer ring is more uniform, and the consistency of the abrasion conditions of the friction blocks of the inner ring and the friction blocks of the outer ring is better;3, gaps between the friction blocks and the steel back are reasonably designed, so that the problem of framework deformation caused by too high braking temperature under a severe working condition issolved; and 4, the rotation of the friction blocks is effectively limited by means of the design of the two straight edges of each friction block and anti-rotation bosses, and the reliability of the friction blocks in the using process is improved.

An urban heat island effect relief mirror is composed of an insulation board 1 and concave mirror 2 which are integrated. A plurality of blocks of concave surfaces are formed on the insulation board in a pouring or vacuum aluminum plating method, and then a layer of reflective materials are coated on the concave surfaces to form the concave mirrors. The concave mirrors are fully distributed on the outer surface of the insulation board in a step mode. During use, the urban heat island effect relief mirror is attached to outer walls and roofs of buildings or the grounds, the insulation board is used for heat preservation, and the concave mirrors are used for reflecting sunshine. The concave mirrors have a sunshine converging effect and inwards refract the reflected light rays so that when sunshine illuminates to the concave mirrors on the buildings, the reflected light stays away from the buildings due to inward refraction and instead spreads to the space, radiation of urban sunshine is reduced, and accordingly the urban heat island effect is reduced. The urban heat island effect relief mirror improves the current hot situation of cities, balances the temperature differences between cities and suburbs, prevents suburban pollutants from entering cities, and accordingly relieves urban air pollution.

The invention relates to a distributed photovoltaic grid-connected cabinet. The cabinet comprises a sealed cabinet, wherein a heat conduction assembly is installed in cabinet, one end of the heat conduction assembly is arranged in the cabinet, the other end is buried in underground soil, and the heat conduction assembly is used to guide heat exchange between the cabinet and the soil. The cabinet is advantaged in that the structure is stable, layout is reasonable, heat exchange circulation with the ground can be realized, a problem of overlarge temperature difference is effectively balanced, use of extra temperature control and temperature regulation equipment is avoided, use cost is reduced, assembly is convenient, transportation is convenient, and current use requirements are met.

A multi-kinetic energy wiper include a housing, A heat chamber and a cooling chamber are arranged in that shell, A cool chamber is located below that heat chamber, A heating resistance wire is arranged in the heating room, an air inlet pipe is arranged at the right end of the heating room, a micro-fan is arranged on the air inlet pipe, an air outlet hole is arranged on the surface of the heating room, a micro-refrigeration pipe is arranged in the cooling room, a water inlet pipe is arranged at the right end of the cooling room, a water outlet hole is arranged on the surface of the cooling room, a cleaning brush is arranged on the left side of the shell, and a wiper plate is arranged on the upper end of the shell. As that cool chamber and the heat chamber are arranged, when the temperaturein the vehicle is low or high, cold water and hot air are sprayed to cool and heat the vehicle window, thereby effectively balancing the temperature difference between the vehicle and the outside, reducing the generation of water mist, and simultaneously removing the frost and snow adhered to the outside of the glass.

The invention relates to an energy saving type water dispenser, which comprises a body, a heating water box, a refrigeration cavity, a cold water box and a refrigeration mechanism, wherein the heating water box, the refrigeration cavity, the cold water box and the refrigeration mechanism are arranged in the body; the refrigeration mechanism is formed by sequentially connecting a compressor, an evaporator and a condenser; the condenser is partially or totally arranged in the cold water box; the cold water box communicates with the heating water box through a water outlet pipe; a temperature difference power generating sheet is respectively arranged on the outer wall of the refrigeration cavity and the cold water box; the temperature difference power generating sheets are connected with a rechargeable battery; wing sheets are arranged on the two side walls of the heating water box. The energy saving type water dispenser has the beneficial effects that the redundant heat energy and cold energy can be recovered; the power utilization rate of the water dispenser is improved; the cost is reduced.