36results about How to "Reduce heat conduction area" patented technology

The invention discloses a supporting device of an inner container in a low-temperature storage tank, which can decrease the evaporation rate and comprises a supporting pipe, an upper pipe seat and a lower pipe seat, wherein the upper pipe seat is arranged at the center of the bottom of the inner container, the lower pipe seat is arranged on a corresponding position on the inner wall of the shell of the storage tank and matched with the upper pipe seat, and both ends of the supporting pipe are respectively arranged in the upper pipe seat and the lower pipe seat. In the invention, the single supporting pipe is adopted for supporting, thereby greatly decreasing the heat conducting area, decreasing the evaporation rate, improving the heat insulating performance of the whole low temperature storage tank and enabling the structure to be used in a high-vacuum multilayer heat insulation low temperature storage tank.

The invention discloses an aero-engine fuel nozzle structure. The fuel nozzle structure comprises a sleeve shell and an oil conveying part, wherein the oil conveying part comprises a first oil conveying part and a second oil conveying part, one end of the second oil conveying part is integrally connected with the first oil conveying part, and the other end of the second oil conveying part is connected with an auxiliary vortex device, the sleeve shell is integrally formed with the oil conveying part, a sleeve is arranged outside the second oil conveying part and is extended to the second oil conveying part from the boundary of the first oil conveying part and the second oil conveying part, a semi-closed air heat insulation cavity is provided with the radial space between the second oil conveying part and the sleeve, and elastic pieces which are in contact with the opposite side walls of the air heat insulation cavity are arranged on the open side of the air heat insulation cavity. The fuel nozzle structure has the advantages of stable and reliable structure, long service life and the like.

The invention relates to an automatic liquid nitrogen filling refrigeration device of a high-temperature superconducting magnet. The refrigeration device comprises a magnet cooling dewar flask, a nitrogen evaporation pipeline, a liquid nitrogen pipeline, a liquid nitrogen communication vessel and an outside liquid nitrogen vessel, wherein the magnet cooling dewar flask comprises an inner liner and an outer liner; a vacuum interlayer is formed between the inner liner and the outer liner; the outer liner is connected with an upper end cover of the magnet cooling dewar flask by flange bolts; a permanent magnet is arranged above the upper end cover; cold conducting discs are respectively arranged on the two outer sides of the top of the inner liner; the high-temperature superconducting magnet generating a suspension force with the permanent magnet is arranged above the cold conducting discs; the nitrogen evaporation pipeline penetrates through the tops of the outer liner and the inner liner; the liquid nitrogen pipeline penetrates through the bottoms of the outer liner and the inner liner; the nitrogen evaporation pipeline is connected with one port at the top of the liquid nitrogen communication vessel by a first hose; a port at the bottom of the liquid nitrogen communication vessel is connected with the liquid nitrogen pipeline by a second hose; and another port at the top of the liquid nitrogen communication vessel is connected with a port of the outside liquid nitrogen vessel by a third hose.

The invention relates to a directly-buried steam pipeline for long-distance transportation, specifically to a pipeline which is used for urban cogeneration central heating and which is improved according to the underground directly-buried main pipe network, belonging to the technical field of energy conservation and consumption reduction of heat distribution pipelines in the heating field. Advanced porous fiber materials are utilized as a support body, newest nanoscale particles are added to compose a soft coil which is flexible, light, temperature resistant (540 degrees centigrade), hydrophobic and noncombustible, and which has a low thermal conductivity factor lambda that is not greater than 0.003, and pure aluminum foils with high reflection performance of 50-90% are hierarchically filled according to the need, and are organically combined with a heat insulation bracket to compose a new composite heat insulation structure which has small heat transfer coefficient, high radiation shielding rate and no convection radiation. The bracket utilizes a plurality of new locking-plate type structures so as to reduce heat transfer area, and also coordinates with high-efficiency heat insulation materials to securely transfer thrust of the pipeline, also insulate heat, keep warm and prevent heat flow leaking.

The invention provides a software dome, which comprises a metal bracket. A roof covering covers the outer surface of the metal bracket. The software dome is characterized in that: a curtain is arranged on the lower part of the inner surface of the metal bracket through traction devices uniformly distributed on the metal bracket; the bottom of the curtain is connected with the bottom of the metal bracket; the bottom of the metal bracket is provided with at least one air extracting device; and the air extracting device vacuumizes outwards to make a space between the roof covering and the curtain form an airtight chamber. The software dome has the advantages that: the software dome has low cost, and is easy to mount and suitable for stadiums with any size; the watching effect and the dome structure cannot be influenced due to accident factors; the software dome is conveniently used outdoors in cold and hot weather; and simultaneously, the software dome can be made into a permanent theater and also can be made into a temporary science education device.

The invention provides an electric cooker. The electric cooker comprises a hollow cooker body with the open upper end, a hollow heat insulation shield with the open upper end, an inner pot and an induction coil, wherein the hollow heat insulation shield is mounted in the cooker body, and a closed heat insulation hollow cavity is arranged in the wall of the heat insulation shield; the inner pot is mounted in the heat insulation shield; the induction coil is mounted between the wall of the cooker body and the wall of the heat insulation shield, and the heat insulation hollow cavity is positioned between the inner pot and a coil plate; the heat insulation shield prevents the inner pot from transmitting heat to the induction coil and the cooker body. With the adoption of the technical scheme, the heat of the inner pot is prevented from dissipating to the outside, so that the waste of the energy is reduced, in addition, the situation that the heat dissipated from the inner pot damages an insulating layer of the induction coil is avoided, further, the use safety of the electric cooker is improved, the service life of the electric cooker is prolonged, moreover, the size of the electric cooker can be reduced, and the heating efficiency of the electric cooker is improved.

The invention provides a hollow cathode heater with a heat preservation function. A heat shield component is integrated outside a heater component of a hollow cathode; a cavity between an outer sleeveand an inner sleeve is divided into two sub-cavities; heat preservation materials are filled in the sub-cavities; and sealing of the heat shield component is achieved by a bottom plate and a top cover at the two ends of the sleeves. Axial and radial radiation heat of a hollow cathode is effectively reflected step by step by arranging different thermal insulation layers, so that the heat conduction area of the hollow cathode is reduced; the heat efficiency of the heater component of the hollow cathode can be improved; and the discharge voltage of the hollow cathode during self-maintained discharge can be reduced. In addition, a contact holding pole and the heater component of the hollow cathode are respectively mounted inside and outside the heat shield component, so that an insulation distance between the contact holding pole and the heater component of the hollow cathode is increased; a discharge phenomenon generated due to a too close distance of the contact holding pole and the heater component can be prevented; and the structural complexity of the contact holding pole of the hollow cathode can be effectively reduced.

The invention discloses a crystallizer, belonging to the technical field of copper and copper alloy strip plate horizontal continuous casting device and comprising an upper graphite plate, a lower graphite plate, a left graphite strake, a right graphite strake and an upper copper plate and a lower copper plate which are respectively provided with an upper cooling pipeline and a lower cooling pipeline, wherein, the left graphite strake and the right graphite strake are arranged between the upper graphite plate and the lower graphite plate; a cavity is formed among the upper graphite plate, the lower graphite plate, the left graphite strake and the right graphite; the upper copper plate is arranged above the upper graphite plate; the lower copper plate is arranged under the lower graphite plate; the cross sections of the left graphite strake and the right graphite strake are all right trapezoids; and the trapezoid surface is inclined outwards, or the upper surface and the lower surface of the left graphite strake and the right graphite strake are all provided with slot ways. The crystallizer solves the problem that heat load along the motion direction vertical to a copper strip is uneven, and the copper strip produced by the crystallizer does not have the disadvantages of crack, cracked edge, uneven surface and inflection point in casting line.

The invention discloses point-bonding sealed hollow glass. The hollow glass comprises a plurality of pieces of glass, a plurality of spacing bars, a first sealing adhesive, a molecular sieve, and at least one of a second sealing adhesive, a third sealing adhesive and a fourth sealing adhesive; the spacing bars are arranged between the adjacent pieces of glass; the spacing bars are arranged on theperiphery of the glass in a segmented mode to form a closed spacing frame; the molecular sieve is filled in the spacing frame; the first sealing adhesive is arranged between the glass and the spacingbars; the second sealing adhesive is arranged between the adjacent pieces of glass and is positioned on the outer side edges of the spacing bars; or the third sealing adhesive is arranged between theadjacent pieces of glass and located on the outer side edges of the spacing bars; or the third sealing adhesive is arranged between the adjacent pieces of glass and located on the outer side edge of the second sealing adhesive; or the fourth sealing adhesive is arranged at the edge parts of the side surface and the outer surface of the adjacent glass. The point-bonding sealed hollow glass is simple in technological process, high in mechanization and automation degree, short in production period, high in production efficiency and good in product quality, and the service life of the hollow glasscan be greatly prolonged.

The invention relates to an intelligent daylighting roof of a snow removal curtain wall. The intelligent daylighting roof comprises glass boards and supporting rods, wherein the supporting rods are distributed on the top layer of a building in parallel at equal intervals; the heights of the upper ends of the supporting rods are different from that of the lower ends of the supporting rods; the glass boards are fixedly mounted among the supporting rods; the glass boards are divided into an upper layer and a lower layer and mounted on the left and right side walls of the supporting rods; the glass boards in the same layer keep closed state; the glass boards in the two layers keep vacuumed state; the supporting rod adopts a hollow tube; induced draft holes are formed in the upper walls of the supporting rods at equal intervals; air inlet valves are arranged at the lower walls of the supporting rods; the air inlet valves are communicated with the interior of a room. The intelligent daylighting roof is simple in structure, and can effectively collapse deposited snow layers on the roof, promote deposited snow to be rapidly molten, effectively prevent from being damaged by the prolonged pressure of the deposited snow, and effectively prevent the deposited snow from sliding down integrally and injuring residents.

The invention relates to a valve, in particular to an air valve. The air valve comprises a horizontal valve body and a vertical valve body which are connected in a T shape, wherein flanges are connected to two ends of the horizontal valve body and the upper end of the vertical valve body, a bracket is fixedly connected to the outer side wall of the vertical valve body through a positioning plate, a bracket fixing plate is mounted in the bracket, a sunk screw penetrates through an actuator fixing plate and is fixed on an insulation mica ring b in the bracket and insulation mica pads on two sides of the bracket, so that the actuator fixing plate is fixedly connected with the bracket in an insulation manner, and an insulation transmission mechanism is located in the bracket. The air valve has the benefits as follows: tumblers and a compression arm are fastened by hexagon socket head cap screws, so that consistency of angles of the two tumblers and corresponding valve plates, that is, the rotation synchronism of the valve plates, is guaranteed; by means of the assembling structures of a spindle connecting sleeve and a spindle rotating disc as well as an actuator connecting shaft and an insulation rotating disc, driving force of an actuator can be transmitted effectively.

The invention discloses a heat exchange device. The heat exchange device comprises a hollow outer shell, a main heat exchange tube layer, a condensation heat exchange tube layer and a first baffle, wherein the main heat exchange tube layer, the condensation heat exchange tube layer and the first baffle are arranged in the outer shell and are hollow. First fluid channels are formed in the wall bodyof the main heat exchange tube layer, a first gas channel communicating with the inner side and the outer side is formed on the wall body of the main heat exchange tube layer, and the first gas channel is distributed between the first fluid channels; the condensation heat exchange tube layer sleeves the periphery of the main heat exchange tube layer at intervals, and second fluid channels communicating with the first fluid channels are formed in the wall body of the condensation heat exchange tube layer; and the first baffle is located between the main heat exchange tube layer and the condensation heat exchange tube layer, a plurality of first flue gas through holes communicating with the inner side and the outer side are formed in the first baffle, and the plurality of first flue gas through holes are opposite to the first fluid channels and are distributed in the direction of the first fluid channels. According to the heat exchange device, the flue gas temperature distribution is more uniform, the heat exchange is more sufficient, heat waste is reduced, and the heat exchange efficiency is greatly improved.

Provided is a large-scale floor type heat preservation steel plate squat silo. A house type warehouse is still served as the main grain warehouse for long-term store in our country, but the height of grain storing is low (the height is below 6.5m commonly), the floor area is large, the degree of mechanism is low, a large number of high energy consumption building materials such as bricks and cement are used, and environmental protection can not be achieved. The large-scale floor type heat preservation steel plate squat silo comprises a foundation (1) and a silo body connected with the foundation; the silo body is composed of a silo cylinder body (2) and a silo top (5), and the silo top is provided with a center hole (3) with a flange; a large-scale axial flow fan (4) is connected with the center hole through a moving frame and / or the flange; the lower portion of the silo cylinder body is provided with a gate (6) which can satisfy the getting in and out of a large-scale grain machine. The large-scale floor type heat preservation steel plate squat silo is used as the steel grain warehouse for long-term store.

The invention relates to a high-performance missile-borne laser device. The high-performance missile-borne laser device comprises a shell, a containing cavity with an upper opening and a lower openingis formed in the shell, and an optical collimation lens, a laser device collimation assembly, a laser constant-power driving circuit board, a first elastic pressing ring, a columnar battery and a second elastic pressing ring are sequentially arranged in the containing cavity from top to bottom. The bottom end of the shell is detachably provided with a bottom cover, and a screw hole aligned with the negative electrode of the columnar battery is formed in the middle of the bottom cover. The containing cavity is filled with a filling and sealing material. The missile-borne laser device is machined into an H shape through the shell, so that the contact heat conduction area of the laser device and a projectile body is greatly reduced, thermal diffusion is reduced, and the laser device collimation assembly is protected against thermal shock of an external high-temperature environment. The optical collimation lens, the laser collimation assembly, the laser constant-power driving circuit board and the columnar battery are subjected to integrated solid-state filling and sealing, the crimp-type electrode structure guarantees the overall firmness and reliability of the whole laser device, and the laser device is reasonable in structural design, stable in performance and resistant to vibration.

The invention discloses a small reactor main pump. The small reactor main pump comprises a pump end used for conveying a transmission medium, a motor end used for driving the pump end, and a pump shaft penetrating through the pump end and the motor end, wherein the pump end comprises a pump shell, and the motor end comprises a shielding motor; an air heat insulation screen is arranged between the pump end and the motor end, the bottom surface of the air heat insulation screen is fixed on the top surface of the pump shell, the top surface of the air heat insulation screen is fixed on the bottom surface of the shielding motor, and the outer circumference of the air heat insulation screen is provided with a necking part shrinking inwards. The small reactor main pump has the technical effects that on the basis of meeting a vibration demand, the heat conduction area of the air heat insulation screen is reduced as much as possible, so that the transmission of heat of the pump end to the shielding motor is slowed down, the temperature inside the shielding motor is controlled within a reasonable range, and the service life of the shielding motor is prolonged.

The invention discloses a vacuum insulation panel with low edge thermal bridge effect and aims to reduce structure-caused thermal bridge effect and make the vacuum insulation panel lower in heat conductivity and more energy saving. The vacuum insulation panel comprises an aluminum foil bag made of an aluminum-plastic composite film; an insulation core is disposed in the aluminum foil bag; the aluminum foil bag is made into a sealed-periphery vacuum insulation panel body by packaging. The vacuum insulation panel is characterized in that overlap width of an aluminum foil or aluminized film in the aluminum-plastic composite film at the sealed edges is smaller than the width of the sealed edges, namely the aluminum foil or aluminized film in the aluminum-plastic composite film at the sealed edges retracts in. Overlap heat transmission area is reduced, so that thermal bridge effect caused by reduced insulation performance is reduced; meanwhile, the edges of the aluminum foil or aluminized film are covered with the plastic film, having poor heat conductivity, on the inner and outer surfaces of the aluminum foil or aluminized film and not exposed, direct heat exchange between the aluminum foil or aluminized film and the outside is prevented, and accordingly thermal insulation performance of the vacuum insulation panel is greatly improved and energy conservation effect is better.

The invention provides broken bridge hollow glass which comprises two pieces of glass, a broken bridge spacing bar, a molecular sieve, a bonding seal between the glass and the broken bridge spacing bar and a bonding seal on the periphery of the glass, and a closed hollow layer is formed between the two pieces of glass and the broken bridge spacing bar; the two pieces of glass and the outer side edge of the broken bridge spacing bar are integrally sealed through one or more of sealant, structural adhesive, sealing tape and sealing adhesive tape. The spacing bar is simple in structure and convenient to manufacture, the heat conduction performance of the spacing bar can be greatly reduced, the edge cold bridge problem of the hollow glass is solved, the heat insulation performance of the hollow glass is further improved, and the service life of the hollow glass can be greatly prolonged.

The invention relates to the technical field of gas appliances, in particular to a pot rack and a gas stove. The pot rack comprises an upper-layer rack and a lower-layer rack, the upper-layer rack is provided with an outer flange, a plurality of notches are formed in the edge of the outer flange, and the outer flange is connected with the outer surface of the side wall of the lower-layer rack in an interference fit mode so that a cavity can be formed between the upper-layer rack and the lower-layer rack. Due to the fact that the notches are formed in the edge of the outer flanging, when the outer flanging is connected with the outer surface of the side wall of the lower-layer frame in an interference fit mode, the contact area between the outer surface of the side wall of the lower-layer frame and the outer flanging is reduced, namely, the heat conduction area between the lower-layer frame and the upper-layer frame is reduced, and meanwhile the cavity has the effect of blocking heat transfer. Therefore, the heat transferred from the upper-layer frame to the lower-layer frame and the cooker panel is reduced, the temperature of the cooker panel is effectively prevented from being too high, the panel is protected from being damaged and broken due to high temperature, and the safety is improved.

PURPOSE: A premixed charge compression ignition engine structure and a premixed charge compression ignition-type reciprocating generator are provided to obtain a high compression ratio of 30 or so, to reduce energy loss, and to reduce heat loss. CONSTITUTION: A premixed charge compression ignition engine structure includes a suction port to which a suction valve is formed; an exhaust port to which an exhaust valve is formed; and a suction manifold connected to the suction port. An injector is formed to the suction manifold. In the premixed charge compression ignition engine structure, fuel and air are uniformly mixed from the suction manifold. The premixed charge compression ignition engine structure includes a cooling nozzle formed to the upper end of a combustion chamber; a cooling fluid pump(30) supplying a cooling fluid to the cooling nozzle; and a storage tank(28) storing the cooling fluid. Self-ignition is executed just when reaching a high compression ratio by injecting the cooling fluid to the combustion chamber under high pressure. In the premixed charge compression ignition engine structure, a first connecting rod(42) connected to a piston(40) is connected to a first support plate(43) and a second connecting rod(46) connected to a crankshaft(48) is connected to a second support plate(45). The first and second support plates are supported and joined by plural springs(44).

A tile core veneer comprises at least two panels and a corrugated core arranged between the panels, wherein reinforcing ribs are arranged on the side wall of the corrugated core and adopt groove or bulge structures. On one hand, the bending resistance and the torsion resistance of the corrugated core can be improved, and the overall strength of the tile core veneer is further improved; on the other hand, the brazing efficiency can be improved.

The invention discloses a reinforcing structure for an earthing double-shell low-temperature liquid hydrocarbon storage tank in the technical field of petrochemical engineering, and the earthing double-shell low-temperature liquid hydrocarbon storage tank consists of a double-shell horizontal storage tank, an earthing layer, a continuous sand bed foundation and a civil engineering foundation, and is characterized in that the reinforcing structure is uniformly distributed along the axial direction of the horizontal double-shell storage tank; the reinforcing structure comprises a top plate, lattice rod pieces and wing plates, the top plate, the lattice rod pieces and the wing plates are prefabricated into a circular ring structure through welding, and the lattice rod pieces are vertically, obliquely and crossly arranged along the circumference; two ends of the lattice rod piece are respectively welded with the wing plate and the top plate; the top plate is welded to the inner wall of the outer tank barrel, and heat insulation cushion blocks are arranged between the wing plates and the outer wall of the inner tank barrel. By the adoption of the reinforcing structure, the technical problem that the outer tank of the soil covering tank bears external uneven external pressure and loads such as the weight of the inner tank can be solved, meanwhile, it can be guaranteed that the granular heat insulation materials can freely flow in the annular space and are easy to fill, and it can be guaranteed that the loss of cooling capacity is small.

The invention provides a telescopic spacing bar which is at least composed of two parts, a convex edge, a groove or a convex edge which are matched with each other are arranged between every two adjacent parts, and one part of the convex edge can be embedded into the groove of the other part or between the convex edges to form a telescopic structure. The invention further provides telescopic hollow glass, the number of the glass is two, and a closed hollow layer is formed between the two pieces of glass and the telescopic spacing bar. The outer side edge of the hollow layer is integrally sealed through a sealing tape or a sealing adhesive tape, and the sealing tape or the sealing adhesive tape forms a certain expansion amount through corrugation and can adapt to the breathing action of the hollow glass so as to synchronously stretch out and draw back with the telescopic spacing bar. The heat conduction performance of the spacing bar can be greatly reduced, the heat insulation and heat preservation performance of the hollow glass is further improved, especially the flatness of the surface of the glass is improved, the mirror surface effect is kept, and the service life of the hollow glass can be greatly prolonged.

The invention relates to a heat exchange tube. The heat exchange tube comprises a heat exchange tube and is characterized in that the heat exchange tube is a thread corrugated tube; not only can the heat conducting area of the heat exchange tube with same length be greatly increased, but also the fluid in the tube can form turbulent flow, so that the heat exchange time is greatly shortened, the heat exchange efficiency can be improved in multiples, especially the turbulent flow formed by the fluid in the tube also can be used for washing the inner wall of the tube so as to lead the wall of the tube to be difficultly scaled, and avoid the influence of the scale on heat exchange efficiency; the heat exchange tube is easily bent and is suitable for processing a coil type heat exchanger by using single pipeline; and the corrugated tube also can buffer expansion with heat and contraction with cold of the pipeline in the use process of the heat exchanger, so that the damage to the equipment due to the factor of the linear expansion coefficient of the material is reduced. Therefore, the heat exchange tube has the advantages of large heat-conducting area, short heat exchange time, good heat exchange effect, less consumption of the heat exchange tube, resource saving, environmental protection, small equipment-occupying area, easy maintenance, difficult damage, low cost and the like, and is an update product with high cost performance, economy, practicability and obvious social and economic benefits.

The invention relates to an intelligent daylighting roof of a snow removal curtain wall. The intelligent daylighting roof comprises glass boards and supporting rods, wherein the supporting rods are distributed on the top layer of a building in parallel at equal intervals; the heights of the upper ends of the supporting rods are different from that of the lower ends of the supporting rods; the glass boards are fixedly mounted among the supporting rods; the glass boards are divided into an upper layer and a lower layer and mounted on the left and right side walls of the supporting rods; the glass boards in the same layer keep closed state; the glass boards in the two layers keep vacuumed state; the supporting rod adopts a hollow tube; induced draft holes are formed in the upper walls of the supporting rods at equal intervals; air inlet valves are arranged at the lower walls of the supporting rods; the air inlet valves are communicated with the interior of a room. The intelligent daylighting roof is simple in structure, and can effectively collapse deposited snow layers on the roof, promote deposited snow to be rapidly molten, effectively prevent from being damaged by the prolonged pressure of the deposited snow, and effectively prevent the deposited snow from sliding down integrally and injuring residents.

The invention discloses a crystallizer, belonging to the technical field of copper and copper alloy strip plate horizontal continuous casting device and comprising an upper graphite plate, a lower graphite plate, a left graphite strake, a right graphite strake and an upper copper plate and a lower copper plate which are respectively provided with an upper cooling pipeline and a lower cooling pipeline, wherein, the left graphite strake and the right graphite strake are arranged between the upper graphite plate and the lower graphite plate; a cavity is formed among the upper graphite plate, thelower graphite plate, the left graphite strake and the right graphite; the upper copper plate is arranged above the upper graphite plate; the lower copper plate is arranged under the lower graphite plate; the cross sections of the left graphite strake and the right graphite strake are all right trapezoids; and the trapezoid surface is inclined outwards, or the upper surface and the lower surface of the left graphite strake and the right graphite strake are all provided with slot ways. The crystallizer solves the problem that heat load along the motion direction vertical to a copper strip is uneven, and the copper strip produced by the crystallizer does not have the disadvantages of crack, cracked edge, uneven surface and inflection point in casting line.

The invention relates to an oil-free pendulum type air compressor, which prolongs the working time, reduces the temperature of lubricating oil for a transmission mechanism by 20 DEG C, changes an air inlet flue from a single cavity to double cavities, reduces pulse action, and greatly improves the service life of components. The oil-free pendulum type air compressor comprises a body shell, a crank case, a connecting rod, a rotor, a cylinder, a valve, a sensor and a belt pulley. A crank shaft is arranged on the body shell; the connecting rod is arranged on the crank shaft; the other end of the connecting rod is arranged at one end of a shaft of the rotor; the rotor is arranged in the cylinder; and one end of the crank shaft is provided with the belt pulley, and the other end of the crank shaft is provided with sensor shaft of a sensor motor. The oil-free pendulum type air compressor is characterized in that the connecting rod is arranged on the crank shaft through a pin shaft; a rolling bearing is arranged between the connecting rod and the pin shaft; a plurality of concave parts are evenly distributed on the connected end surface of a connector between the cylinder and the body shell; and the cylinder and the body shell are reserved with an air inlet respectively, and the front end of the air inlet is provided with an air filter. The oil-free pendulum type air compressor is applicable to a cement bulk truck, and also can be used for other devices.

The invention relates to a house frame and a hollow crossbeam thereof. The hollow crossbeam comprises a top edge and a bottom edge along the height direction of a house, and a plurality of through holes are distributed in the top edge and / or the bottom edge. A technical scheme adopted in the invention is characterized in that the plurality of through holes are distributed in the top edge and / or the bottom edge of the hollow crossbeam, and the through holes reduce the surface areas of the top edge and the bottom edge. When heat goes through the top surface and the bottom surface and is transmitted between the indoor and the outdoor, the through holes reduce the heat conduction area, so the indoor and outdoor heat conductivity is very low. Outdoor high-temperature heat can not be easily transmitted to the indoor when the outdoor temperature is higher than the indoor temperature, and the indoor temperature cannot be easily lost to the outdoor when the outdoor temperature is low, so the indoor suitable temperature is effectively maintained.

The invention discloses a vacuum heat insulation material and a preparation method thereof. It is composed of at least two layers of honeycomb plates laminated, and adjacent honeycomb plates are interlaced and bonded. Both ends of the honeycomb plates are provided with foam heat insulation parts. The honeycomb plate is composed of several hexagonal vacuum column compartments of the same specification bonded by heat-insulating adhesives. The vacuum column compartment is composed of a core material with a laminated structure and a high barrier film wrapping the core material. The longitudinal direction of the core material is There are several layers of copper foil at equal intervals, the heat-insulating adhesive is glue mixed with silica airgel, and the outermost layer of the vacuum heat-insulating material is plastic-sealed with a shaping film. The staggered laminated structure of the honeycomb board, the addition of heat-insulating airgel to the heat-insulating adhesive, and the laying of several copper foils in the core material can effectively reduce the thermal bridge effect inside the honeycomb structure, effectively reducing the overall thermal conductivity of the material, and the heat insulation Excellent performance.