49results about How to "Reduce thermal expansion and contraction effect" patented technology

The invention provides a construction method for a well structure of a heat exchange type horizontal butt-joint geothermal well. The construction method for the well structure of the heat exchange type horizontal butt-joint geothermal well comprises the following steps that drilling is conducted on the ground surface until drilling into the stable clay layer or under a bedrock surface, a vertical well first opening well hole is formed, then second opening is conducted from the bottom of the vertical well first opening well hole until drilling under an arbitrary mudstone layer with a thickness being greater than 6m in the target heat storage layer, and a vertical well second opening well hole is formed; drilling is conducted in the surface of the ground surface until drilling into the stable clay layer or under a bedrock surface and the distance between a well opening of a vertical well and the surface of the ground surface is at least 250 m, and a horizontal engineering well first opening well hole is formed; then second opening is conducted from the bottom of the horizontal engineering well first opening well hole, and a horizontal engineering well second opening well hole is formed and communicates with the vertical well second opening well hole in a butt-joint mode, thus a horizontal engineering well cylinder and a vertical well cylinder form a U-shaped pipeline in a seamless butt-joint mode, and the structure is large in section surface area, heat exchanging water amount and heat exchanging amount; and according to the construction method for the well structure of the heat exchange type horizontal butt-joint geothermal well, heat exchanging is achieved only by using circulation of cold and heat water, no underground water is pumped, water resources are protected, the underground water is not polluted at the same time, and the environment-friendly effect is achieved.

The invention discloses a solar heat-absorbing tube and a manufacturing method. The solar heat-absorbing tube comprises an outer layer of a glass tube, a flexible thermal-conductive tube and a positioning device, wherein, the flexible thermal-conductive tube penetrates a shaft line of the glass tube in parallel from the interior of the glass tube and is fixed by the positioning device. Compared with the existing solar heat-absorbing tube technology, the structure and the method have the following advantages: the heat absorption efficiency is high; the impact of thermal expansion and contraction on the thermal-conductive tube is small, and the operation is stable and reliable; the structure and the manufacturing method are simple, the cost is low, the installation and the maintenance are very convenient, thereby being very applicable to large-scale popularization and application; the heat exchange effect of a thermal-conductive medium is strong, the heat transfer is faster, and the mixed flow phenomenon existed in a blind pipe can be avoided.

The invention relates to a flexible rack for a material conveyor and a belt conveyor. The flexible rack for the material conveyor comprises a rack body and supporting legs, wherein materials are arranged on the rack body and are driven to move to a specified position; at least two supporting legs are arranged, one end of each supporting leg is pivotally connected with a fixing base through a rotating shaft, the other end of each supporting leg is in sliding connection with a first strip-shaped hole through a first connecting part which is inserted in a matched mode, and the first strip-shapedholes are arranged along the length direction of the rack body. The plurality of supporting legs are arranged at the bottom of the rack body, one end of each supporting leg is pivotally connected withthe corresponding fixing base, and the other end of each supporting leg is in sliding connection with the corresponding first strip-shaped hole through the corresponding first connecting part, so that the problems that an existing belt conveyor is of a rigid structure and does not have a displacement compensation function and cannot meet the requirement of complex use environments are solved.

The composite modified crystal silicon glass plate is produced through laminating several layers of modified crystal silicon glass sheet with adhesive film, and the modified crystal silicon glass sheet is produced through adhering crushed glass blocks. The product has high strength, certain toughness and low heat expansion coefficient and may have different uses.

The invention provides a processing method of polypropylene pipes. According to the method, copolymerized polypropylene, heavy calcium carbonate, glass beads and antioxidants are evenly mixed and stirred; then a mixture is added to a twin-screw extruder to extrude the pipes; and finally, all that is needed is to cool and shape the pipes. The processing method has the advantages that the processing is convenient and the operation is convenient and simple.

The invention provides a labyrinth type adjusting valve element with a temperature control function. According to the structure, from top to bottom, of the labyrinth type adjusting valve element, the labyrinth type adjusting valve element only comprises a top cover, functional parts and a base, or comprises a top cover, functional parts, partition plate parts and a base; all layers are of an annular disc structure, and the functional parts and the partition plate parts are arranged between the top cover and the base alternately; groove channels are formed in the two faces of each functional part, wherein one face of each functional part is a high-pressure medium working face, and the groove channels on the face enable the inner wall and the outer wall to communicate to form high-pressure medium outlets/inlets; the other face of each functional part is a temperature control medium working face, and temperature control medium outlets/inlets are formed in the positions, corresponding to the functional parts, of the partition plate parts and communicate through the groove channels on the corresponding temperature control medium working faces; the top cover is provided with temperature control medium outlets/inlets, and the lower surface of the top cover is provided with temperature control medium outlet/inlet grooves. According to the adjusting valve element, the heat expansion and cold contraction effect of a pressure reducing valve is relieved, the matching precision of a heat exchange valve element in the operation process is improved, and the outlet pressure of the pressure reducing valve is finely adjusted within a small range.

The invention relates to the technical field of anti-seepage materials, in particular to a preparation method of a salt-tolerant flexible anti-seepage material. The preparation method comprises the following steps: preparing anti-seepage slurry by utilizing polyether glycol, rosin, hexyl diisocyanate, maleic anhydride and the like as raw materials; foaming by utilizing an ethylene-vinyl acetate copolymer, thus preparing a foamed sheet; preparing salt-tolerant polyacrylate emulsion by taking methyl methacrylate and butyl acrylate as monomers; coating two surfaces of the foamed sheet with the salt-tolerant polyacrylate emulsion, thus obtaining salt-tolerant foam; immersing the salt-tolerant foam in the anti-seepage slurry, and drying, thus obtaining the salt-tolerant flexible anti-seepage material. Maleic rosin is utilized for reacting with glycerol to generate modified rosin resin, so that glass-transition temperature of the anti-seepage slurry can be reduced, latex can be used for introducing a non-ionic hydrophilic group to a main chain of foam resin, so that the foam resin has high water absorption capacity; the sensitivity of the foam resin to salt is weaker, and the purpose ofincreasing the slat tolerance of the foam resin can be achieved by reducing the sensitivity of a group on a polymer molecular chain of the foam resin.

The invention discloses a thermoelectric refrigeration and film moisture permeation combined temperature and humidity control system, which provides accurate, rapid and stable temperature and humiditycontrol for micro-environment scenes with special temperature and humidity requirements, such as biological incubators, food storage cabinets, cultural relic display stands and the like. According tothe temperature requirement, the system performs cold end and hot end switching on the thermoelectric module by changing the current direction so as to perform temperature control on air in the microenvironment, and the system is simple in structure, does not consume refrigerants, does not need high-speed moving parts and is low in noise. According to the combined temperature and humidity controlmode adopted by the invention, the cold and heat loads of the thermoelectric module are fully utilized, hot water or cold water is prepared while the temperature of air is controlled, mass transfer driving force is provided for the humidity treatment of the membrane module, and the air is humidified or dehumidified through the moisture-permeable membrane, so that the humidity control is realized.The non-contact humidity treatment mode can effectively avoid the situation that airflow carries liquid drops, and it is guaranteed that the air quality is not affected by the water quality.

The invention discloses hollow glass with built-in louver blades. The hollow glass comprises a frame and two pieces of oppositely-arranged glass, a sealing cavity is formed between the frame and the two pieces of oppositely-arranged glass, the sealing cavity is internally provided with the multiple louver blades and an overturning and lifting mechanism for controlling the multiple louver blades tobe overturned and rise and fall, the overturning and lifting mechanism comprises a rotating shaft, an overturning rotating wheel, a mounting seat, an overturning ladder rope, a lifting pull rope anda control assembly, the overturning rotating wheel is mounted on the mounting seat, the rotating shaft penetrates through the mounting seat and the overturning rotating wheel, one end of the overturning ladder rope is wound around the overturning rotating wheel, the overturning ladder rope is provided with a plurality of ladder openings, the multiple louver blades penetrate through the multiple ladder openings in a one-to-one correspondence mode, one end of the lifting pull rope penetrates through the multiple louver blades and is connected with the louver blade at the lowermost end, and the other end of the lifting pull rope penetrates through the mounting seat and is connected with the control assembly; and the hollow glass further comprises an external magnetic control mechanism arranged on the outer side of the sealing cavity. The hollow glass has the advantages that the rotating shaft can be accurately controlled to rotate, the manufacturing cost is low, resistance is small when amagnetic handle moves up and down, and labor saving is achieved.

The invention relates to a splice Printed Circuit Board (PCB) made from paper fibre plates, which is capable of preventing cracks from forming in the process of the Surface Mounting Technology (SMT). The splice PCB consists of a PCB which is formed by splicing a plurality of PCB units into a whole. The splice PCB is characterised in that the splice PCB is opened with strip-shaped grooves. Two or more strip-shaped grooves are arranged and the strip-shaped grooves are evenly distributed on the splice PCB. The strip-shaped grooves are evenly distributed on the splice PCB along the horizontal direction. The strip-shaped grooves are evenly distributed on the splice PCB along the vertical direction. The strip-shaped grooves are evenly distributed on the splice PCB, combining horizontal and vertical distributions. The splice PCB adopting the structure is effective for preventing cracks from forming in the SMT process, thereby improving product percent of pass.

The invention relates to a plastic-wood floor combined structure which comprises a wood floor and a plastic floor. The wood floor is positioned on an upper layer, the plastic floor is positioned on a lower layer, the wood floor comprises a floor surface, the plastic floor comprises a top surface, and the width and the length of the top surface of the plastic floor are identical to the width and the length of the floor surface of the wood floor. The plastic-wood floor combined structure has the advantages that the plastic-wood floor combined structure not only has waterproof, insect-proof and corrosion-resistant merits of the plastic floor, but also has vision and the sense of touch of the wood floor, and is provided with stable support structures, required materials for manufacturing the plastic-wood floor combined structure can be reduced, and influence of thermal expansion due to change of ambient environment temperatures can be reduced; the wood floor of the plastic-wood floor combined structure is easy and convenient to process and is low in deformation after being formed, accordingly, the thickness of the plastic-wood floor combined structure can be increased conveniently, the texture of the plastic-wood floor combined structure can be enhanced, and the plastic-wood floor combined structure brings convenience for mounting a plurality of floors.

The invention discloses a fabricated wall connecting joint and a construction method thereof. The fabricated wall connecting joint comprises a first prefabricated part, wherein a second prefabricatedpart is fixedly arranged on the side face of the first prefabricated part, and an upper connecting piece and a lower connecting piece are fixedly arranged on the two sides, close to the first prefabricated part, of the second prefabricated part correspondingly; a first prefabricated wall is arranged on the upper portion of the first prefabricated part; a second prefabricated wall is arranged on the lower portion of the first prefabricated part; and a third prefabricated wall is arranged between the second prefabricated part and the upper connecting piece, and a fourth prefabricated wall is arranged between the second prefabricated part and the lower connecting piece. The fabricated wall connecting joint can be suitable for connecting the prefabricated wall in the up-down longitudinal direction and a right-angle type prefabricated wall between the transverse direction and the longitudinal direction, the application range is wide, and the connecting strength is high. The invention further provides the construction method of the fabricated wall connecting joint, operation is easy and fast, and the fabricated wall connecting joint and the construction method thereof are very worthy ofpopularization.