262 results about "Air layer" patented technology

The utility model provides a warm-keeping weft knitting fabric with a three-dimensional effect, which is a fabric which is knitted on a circular knitting machine and has a rib air layer tissue structure. The fabric is formed by alternately weaving a fabric structure air layer composed of tight and stiff single-face weft plain stitch coil transverse rows and loose and soft single-face weft plain stitch coil transverse rows and loose and soft double-face rib stitch transverse rows, and the fabric structure air layer obviously protrudes out of the surface of the fabric; the tight and stiff single-side weft plain stitch transverse columns are woven by paper composite yarns, the loose and soft single-side weft plain stitch transverse columns are woven by fine modified polyester Monenz yarn blended yarns, and the loose and soft single-side weft plain stitch transverse columns are woven by the fine modified polyester Monenz yarn blended yarns, so that a transverse stripe effect is formed between the loose and soft single-side weft plain stitch transverse columns and the flat loose and soft double-side rib stitch transverse columns. The loose and soft double-faced rib coil row is formed by weaving fine-count modified polyester Monenz yarn blended yarn, the paper composite yarn is composed of paper yarn, first modified polyester supercool multifilament and second modified polyester supercool multifilament, and the outer surface of the paper yarn is sequentially wrapped with the first modified polyester supercool multifilament and the second modified polyester supercool multifilament from inside to outside.

A system and method for enhancing marine vessel efficiency through integrated hull optimizations is disclosed. The system includes automated bow thruster covers that reduce hull drag and condition water flow, coupled with strategically positioned air lubrication nozzles that create and maintain an air layer under the vessel. The bow thruster covers may be configured as circular doors or parallel panels, optionally incorporating air discharge ports or working in conjunction with dedicated air jets. An intelligent control system optimizes the integrated components using real-time sensor data and computational fluid dynamic analysis. The system modulates air distribution and cover positions based on sea conditions and vessel speed, maintaining optimal efficiency during operation. External surfaces may incorporate superaerophilic structures to enhance air retention and reduce drag. The comprehensive integration of these components provides improved hydrodynamic efficiency while maintaining full bow thruster functionality when required.

The broadband circular polarization conformal antenna adopts the combination of three layers of dielectric substrates and an air layer, and comprises an upper layer dielectric substrate, a middle layer dielectric substrate, a lower layer dielectric substrate, a central 2 * 2 corner cut square patch, a peripheral 16 corner cut square patch, a square feed patch with a rectangular groove formed along a diagonal line, a metal floor and a feed microstrip line, a metasurface structure is printed on the upper surface of the upper-layer dielectric substrate 1 and comprises a 2 * 2 corner cut square patch array 4 located in the center and 16 corner cut square patches 5 surrounding the center array; a square feed patch and a feed microstrip line are printed on the lower surface of the middle-layer dielectric substrate 2, the square feed patch is located at the dead center of the lower surface of the middle-layer dielectric substrate, and a rectangular groove is formed in the dead center of the square feed patch in the diagonal direction; and a complete metal floor is arranged on the lower surface of the lower dielectric substrate. The antenna has the characteristic of low profile, and the antenna can be conformal to a cylindrical surface carrier platform.

The utility model relates to the field of knitted fabrics, and provides a knitted fabric capable of being freely cut, the knitted fabric capable of being freely cut is of a double-faced weft knitting air layer tissue structure, and the knitting pattern of the knitted fabric capable of being freely cut takes six-way patterns as a cycle; the six paths of patterns are as follows: the first path is floating threads, tucking, tucking and floating threads; the second path and the fifth path are loops, loops, floating threads and floating threads; the third path and the sixth path are floating threads, floating threads, looping and looping; and the fourth path is tucking, floating thread, floating thread and tucking. Compared with the prior art, the knitted fabric capable of being freely tailored has the advantages that the hemming property, the raveling property and the dropping property of the fabric are greatly improved through mutual association and combined action of a special organization structure and a knitted pattern, and the requirement of a customer on free tailoring can be met; meanwhile, the skin-friendly softness of the fabric is also ensured.

The invention discloses a mechanical non-resonant one-bit phase electromagnetic reflection metasurface unit, and belongs to the field of artificial electromagnetic materials. The unit comprises a non-resonant electromagnetic structure and a mechanical driving device. The non-resonant electromagnetic structure comprises a dielectric layer, an air layer and an adjustable metal backboard from top to bottom; the mechanical driving device adopts a bidirectional self-holding electromagnet, a screw rod of the bidirectional self-holding electromagnet is connected with the metal back plate, the back plate is driven to be switched between two preset positions through forward / reverse pulse current, the thickness of an air layer is accurately adjusted, and therefore one-bit dynamic switching of a reflection phase between 0 degree and 180 degrees is achieved through propagation phase accumulation. In the 5G millimeter wave frequency band of 20 GHz to 29.5 GHz, the reflection coefficients of the two states are both larger than 0.99, the phase difference is stabilized within 180 degrees + / -20 degrees, and good robustness is achieved for mechanical displacement deviation. The unit has the advantages of zero static energy consumption, low insertion loss, wide bandwidth, simple structure and simple control, and is suitable for a low-power-consumption intelligent reflecting surface and a dynamic beam forming system.

The utility model discloses photovoltaic direct-drive type heat storage heating equipment, and relates to the technical field of heating devices. The utility model provides photovoltaic direct-drive type heat storage and heating equipment which comprises a shell, a heat storage device and a heat supply device. The heating piece is arranged in the containing cavity, and a heat storage piece is arranged on the periphery of the heating piece; wherein a first air layer is arranged between the heat storage part and the top wall of the shell, and a second air layer communicated with the first air layer is arranged between the heat storage part and the bottom wall of the shell; the top wall of the shell is provided with an air outlet communicated with the first air layer, and the bottom wall of the shell is provided with an air inlet communicated with the second air layer; and the size of the air outlet is adjustable, so that heat generated by the heating piece can be selectively led out from the air outlet or heat the heat storage piece.

The utility model relates to building energy -saving technical field solves the problem that traditional hollow glass depends on air layer heat insulation, but the heat conductivity coefficient is higher, and the energy -conserving effect is limited, and low emissivity coated glass needs to cooperate inert gas filling, and the process is complex and the durability is insufficient. Specifically, a glass heat insulation assembly, including outer glass, the front of outer glass is equipped with the snap -groove, the inside of snap -groove is provided with first adhesive layer, the front of first adhesive layer is provided with heat insulation assembly, the front of heat insulation assembly is provided with second adhesive layer, heat insulation assembly includes fixedly connected in first adhesive layer target flexible heat insulation core layer, the front of flexible heat insulation core layer is fixedly connected with reflection film layer, the front of second adhesive layer is fixedly installed with toughened glass, the outer surface of second adhesive layer is fixedly connected with first elastic heat conduction adhesive tape, the edge of outer glass is fixedly connected with second elastic heat conduction adhesive tape, and second elastic heat conduction adhesive tape is used for the edge of outer glass seal.

The utility model relates to the field of chemical oxygen generation and heat insulation, in particular to an onboard chemical oxygen generator with a heat insulation structure, which comprises a starting mechanism, a starting base detachably connected with the lower end of the starting mechanism, an upper connecting piece, a lower connecting piece and a heat insulation structure, the inner circumferential surface of the top end of the inner tank body is fixed with the outer circumferential surface of the lower end of the upper connecting piece; the upper end of the outer circumferential surface of the lower connecting piece is fixed with the inner circumferential surface of the bottom end of the inner tank body; due to the fact that the outer tank body is adopted and the annular space is formed between the outer tank body and the inner tank body, the problem that the temperature of the outer surface of the inner tank body is too high due to the fact that heat is generated in the inner tank body is effectively solved, and the temperature of the outer tank body meets the standard due to the fact that the static air layer in the annular space between the inner tank body and the outer tank body is low in heat conductivity. Meanwhile, air heat insulation is adopted in the annulus, so that the overall weight is reduced, and the requirement of light-weight products is met.

The utility model relates to the technical field of retroreflective sheeting provides an environmental protection type hard PVC retroreflective sheet, solves the problem that the reflectivity of existing retroreflective sheet is low, and the optical performance is relatively weak, and the surface layer anti -peeling impact force is not good, including the retroreflective sheet body, the retroreflective sheet body includes the protective surface layer, prism air microcapsule layer, degradable back film layer from top to bottom sequentially laminated, the prism air microcapsule layer includes wall material and core material, the core material includes prism reflection matrix layer and air layer, the protective surface layer is by PVC material layer and acrylic material layer composite, the prism reflection matrix layer is by several microangle pyramid prism structure unit close arrangement, the microangle pyramid prism structure unit is cutting obtains to cubic angle pyramid prism.

This invention discloses a temperature-sensitive weft-knitted air-layer down jacket fabric and its production method, belonging to the field of textile technology. The invention involves weaving a double-sided air-layer structure on a double-sided jacquard circular knitting machine. The surface woven with ordinary fibers is designated S1, and the surface woven with shape memory spandex / ordinary fiber core-spun yarn is designated S2. The connecting yarn between S1 and S2 is made of ordinary fibers. In one weaving cycle, S1 is always woven with ordinary fibers in a loop pattern, and S2 is always woven with shape memory spandex / ordinary fiber core-spun yarn in a loop pattern. After S1 and S2 have woven a certain number of rows, ordinary fibers are used to connect S1 and S2 in a loop pattern to form an intermediate connecting yarn. The connecting yarn forms a horizontal stripe appearance or a wavy appearance. Compared with fabrics without spandex and without shrinkage, the fabric prepared by this invention has a 5.61% higher warmth retention rate and a thickness reduction of approximately 4 mm.

The utility model provides a carbon coating optical fiber containing a compact carbon layer, which relates to the technical field of optical fibers, and is characterized in that an optical fiber core rod is arranged in an outer structure cladding, and an air layer is formed between the inner wall of the outer structure cladding and the outer wall of the optical fiber core rod; and at least one carbon coating is formed between the air layer and the outer wall of the optical fiber core rod and / or between the inner wall of the outer structure cladding and the air layer. The device has the beneficial effects that the effect of preventing mechanical damage is enhanced; and the carbon element of the carbon coating does not pollute the external coating layer.

The invention relates to the technical field of rubber track production, in particular to a cooling-water-free vulcanization method for rubber track two-section ring joint forming, a mold and a semi-vulcanized track blank. In order to solve the problems that the end part needs to retain a repiece while the existing repiece depends on water cooling, the energy consumption is high and the instability is easy to occur, a vertical air isolation groove is formed in a section of mold-hot plate contact area close to a ring joint end, and a double-layer hollow static air layer is constructed to passively control the temperature. The depth of the isolation groove is 8-12mm, and the coupling L between the length of the groove and the pitch p is 3.4-3.6 p; when t is equal to 60 min and the thickness is equal to 43 mm, a spinning-in head of 30-50 mm can be stably obtained, and the requirement for two-section ring connection is met. According to the scheme, a cooling loop is not needed, energy consumption and maintenance cost are reduced, parameterization is easy to reuse, and joint quality and yield are improved.

The goal is to reduce the heating load in winter and the cooling load in summer. [Solution] The membrane structure building comprises a double membrane that constitutes the exterior of the building and has an inner membrane and an outer membrane having a radiative cooling function, and an air blower / discharge device that switches between an insulating mode in which air is blown into the double membrane to form an air layer between the inner membrane and the outer membrane, and a solar radiation shielding mode in which air is discharged from the double membrane to bring the inner membrane and the outer membrane into contact.

The invention relates to the technical field of high-precision optical detection, and discloses a collimator airflow disturbance suppression method and system based on mirror surface temperature difference feedback, and the method comprises the steps: continuously obtaining the mirror surface temperature data of a plurality of discrete regions on the mirror surface of a reflector of a collimator and the air temperature data of a corresponding air layer above the mirror surface; the two kinds of temperature data are compared in real time, and a temperature difference field reflecting temperature difference space distribution between the mirror surface and the air layer is generated; adjusting the mirror surface temperature of the corresponding area according to the temperature difference field; and iteratively executing the steps until the temperature difference field reaches a preset convergence condition so as to suppress the airflow disturbance of the thermal boundary layer. According to the application, the problem of inhibiting dynamic airflow disturbance which is difficult to directly measure is converted into the control problem of carrying out closed-loop control on the temperature difference of the mirror surface microcell which can be accurately measured, and finally, a balance state in which the temperature difference between the mirror surface and air is almost zero is achieved and maintained, so that the generation of disturbance airflow is inhibited.

The utility model discloses a kind of anti skinning devices for viscous feeding chute, including hot air machine, hot air layer and outer insulation layer, hot air layer is sleeved in feeding chute outside, and hot air layer is provided with heat preservation cavity between feeding chute, hot air machine is communicated with heat preservation cavity for into hot air into heat preservation cavity, outer insulation layer is along the outer surface of hot air layer and is arranged, for heat preservation cavity heat preservation;Hot air machine is connected with hot air layer at inlet, and hot air layer is also provided with outlet, and inlet and outlet cooperate to realize the sustained heating of feeding chute. The anti skinning device for viscous feeding chute can effectively prevent feeding chute skinning by introducing hot air to heat feeding chute.

The application provides a glass with energy-saving and wireless communication frequency band enhancement functions, comprising periodically arranged FSS units, each of which comprises an infrared low emission layer, an air layer and a wave-transparent FSS layer, the infrared low emission layer comprising a first glass layer and a first dielectric substrate; the surface of the first glass layer is provided with a first etching layer; the first etching layer comprises a plurality of grid grooves; the wave-transparent FSS layer comprises a second glass layer, a second dielectric substrate and a third glass layer; the surface of the second glass layer is provided with a second etching layer; the second etching layer comprises an annular groove and a plurality of cut grooves arranged on the circumferential side of the annular groove; the surface of the third glass layer is provided with a third etching layer; and the third etching layer is provided with a second annular patch. The structure can realize the effects of wave-transparent communication frequency band and infrared low emission, has visible light transparency, meets certain thickness and is suitable for large-area paving.

The invention provides a long-wave infrared laser reflector with a three-medium structure. The long-wave infrared laser reflector structurally comprises a substrate Sub, a transition layer B, a metal layer G, a medium film system C and an air layer A from bottom to top. The dielectric film system C is structurally characterized by being formed by alternately stacking one or more groups of materials with high, medium and low refractive indexes. The invention aims to realize high reflection of a long-wave infrared band. Through meticulous design, three kinds of materials with high, medium and low refractive indexes are reasonably distributed in the reflector. According to the strategy, the absorption of the reflector is effectively reduced by balancing the low absorption of the chalcogenide and the low refractive index of the fluoride, the temperature rise caused by heat absorption is remarkably reduced, and meanwhile, the reflectivity is improved. Therefore, the continuous laser damage threshold value of the reflecting mirror is greatly enhanced theoretically, and the reflecting mirror shows higher stability and tolerance when facing continuous laser irradiation.

This invention provides a knit fabric that can be freely cut and a method for manufacturing it. [Solution] The freely cut knit fabric has a double-sided flat knit air layer structure, and the knit pattern of the above freely cut knit fabric consists of 6 courses of pattern in one cycle, and the 6 courses of pattern are as follows: the first course is float, tuck, tuck, float, the second and fifth courses are knit, knit, float, float, the third and sixth courses are float, float, knit, knit, and the fourth course is tuck, float, float, tuck. [Effects] Compared to conventional technology, the knit fabric of the present invention has a special structural design and knitting pattern that interact and work synergistically to greatly improve the fabric's ability to curl, fray, and shed threads, meeting customer demands for free cutting, while simultaneously ensuring the fabric's pleasant feel and flexibility.

The invention belongs to the technical field of tunnel engineering and intelligent temperature control, and particularly relates to a cold region tunnel temperature dynamic regulation and control device which comprises a partition light-transmitting heat preservation structure connected to the inlet end of a tunnel and a full-tunnel dynamic keel structure in the tunnel. Heat absorption and heat preservation of the light-transmitting heat preservation room are achieved through composite boards, an intelligent air curtain forms an air curtain barrier at a port, and a heat preservation blanket folding and unfolding system dynamically adjusts the covering state. The keel supporting mechanism drives the insulation board to adjust the thickness of the air layer through the telescopic unit, and the sealing performance is ensured through the flexible material. The device monitors environmental parameters in real time through a sensor, cooperatively regulates and controls the working state of each component, overcomes the defects of high energy consumption and poor adaptability to extreme working conditions of a traditional fixed heat preservation mode, and realizes the unification of stable control of tunnel temperature and improvement of energy efficiency.

The invention discloses a scatterer-based one-way coupling topology photon cavity with variable perimeter. The device comprises a shielding case, and an electrospinning continuous medium layer and an air layer which have a chiral surface state at the junction of the shielding case and the electrospinning continuous medium layer; a cylindrical rotary electric continuous medium is also distributed in the air layer, and a first scatterer of an isotropic medium exists between the cylindrical rotary electric continuous medium and an interface where the chiral surface state is located; and air exists at the junction of the first scatterer and the cylindrical rotating electric continuous medium and the chiral surface state. The one-way coupling topological photon cavity with the variable perimeter gets rid of dependence on strict periodic conditions, and can realize a one-way coupling effect under the condition of photon cavities with different perimeters. While the scattering suppression transmission characteristic of the chiral boundary state is realized, the unidirectional coupling between the chiral boundary state and the scatterer is closely related to the direction of an external magnetic field in the rotary electric continuous medium. Furthermore, by changing the radius size and the magnetic field direction of the photon cavity, the one-way coupling topology photon cavity with variable perimeter and controllable coupling direction is realized.

The utility model relates to the technical field of garment materials, in particular to a double-layer fabric and garment. The double-layer fabric comprises a first fabric layer and a second fabric layer, and the first fabric layer and the second fabric layer are stacked; wherein a plurality of first through holes are formed in the first fabric layer, a plurality of second through holes are formed in the second fabric layer, and the first through holes and the second through holes are formed in a staggered mode. The through holes can serve as air holes and can be contracted and relaxed along with movement of a human body, the double-layer fabric is used for clothes, the effect of slowing down and increasing air exchange between an air layer below the clothes and the external environment can be achieved, and therefore the hot and wet comfort of the human body before and after the movement process is improved. When a person takes exercises, the structure is beneficial to rapid heat dissipation, and after the person takes exercises, the heat can be kept warm. Meanwhile, due to the double-fabric-layer structure, sweat can be absorbed and discharged by the inner layer, the water stain generation effect of the fabric on the outer layer is reduced, and the fabric is kept dry.

The invention relates to a high-elasticity fabric with high dimensional stability, which comprises a fabric body, a bonding layer and an elastic fabric layer, the fabric body sequentially comprises a skin-friendly layer, an elastic connecting layer and a thermal insulation layer from top to bottom; the skin-friendly layer, the elastic connecting layer and the heat preservation layer are woven into a whole through weft knitting air layer tissue. The bottom end of the fabric body is fixedly connected with the top end of the elastic fabric layer through the bonding layer; the skin-friendly layer is formed by weaving wrap yarns, core yarns of the wrap yarns are spandex filaments, and yarn skins of the wrap yarns are blended yarns formed by uniformly mixing and spinning far infrared heating acrylic fibers / antibacterial viscose fibers; the elastic connecting layer is formed by weaving SORONA monofilaments, the heat preservation layer is formed by weaving hollow polyester filaments, and the elastic fabric layer is formed by vertically interweaving warp yarns and weft yarns in a plain weave structure; the fabric is high in size stability, good in environmental protection property and good in skin-friendly heat retention property.

The invention discloses a heat-preservation heat tracing pipeline installation method. The invention belongs to the technical field of pipeline heat preservation and heat tracing, and particularly relates to a heat preservation and heat tracing structure mounting method for a high-temperature pipeline of a sulfur recovery device, which comprises the following steps of: pretreating the surface of the pipeline, welding a supporting piece group, mounting a heat tracing system, coating a galvanized welded wire mesh, mounting a heat preservation layer, and finally assembling an outer protective layer. A unique'heating space 'is formed according to the steps, so that the inner wall of the thermal insulation layer is separated from the high-temperature process pipeline and the outer wall of the heat tracing pipe by a relatively static air layer, the heat loss is effectively reduced, and the heat tracing efficiency is improved; and natural convection of air in the heating space can also enable the circumferential temperature of the pipeline to be more uniform, so that the energy-saving effect is improved.

The present application relates to a new type of stainless steel core double-sided PVT hybrid electric heating assembly, the new type of stainless steel core double-sided PVT hybrid electric heating assembly includes heat transfer inner core, the heat transfer inner core is packed with heat preservation frame around, the heat transfer inner core one side from inside to outside is sequentially provided with insulating layer, PV cell piece and transparent film, the battery piece group both sides are provided with first EVA adhesive film and second EVA adhesive film respectively, the heat transfer inner core other side is provided with the light transmission glass that can be detachably connected with the heat preservation frame, the light transmission glass and the heat transfer inner core between air layer is reserved, the PV cell piece is black silicon PERC cell, the battery has full spectrum operating characteristics, and after secondary annealing process, it has lower temperature attenuation coefficient, can work long-term under high temperature, the electric heating assembly structure is reasonable, and has the effect of high temperature resistance, in actual use, the electric heating radiation conversion rate of electric heating product is greatly strengthened, and it is suitable for promotion and use.

The application discloses a reflection wave-absorbing body with a wide-range controllable reflection frequency band, which comprises a lossy layer, a first dielectric layer, an air layer, a non-lossy layer, a second dielectric layer and a ground layer arranged from top to bottom; the lossy layer is located on the upper surface of the first dielectric layer, the air layer is between the first dielectric layer and the non-lossy layer, the non-lossy layer is located on the upper surface of the second dielectric layer, and the ground layer is located on the lower surface of the second dielectric layer. The reflection frequency band of the application has a certain bandwidth, and the wide-range control of the reflection frequency band can be realized by controlling the length of a C groove in the lossy layer and the length of a Jerusalem cross structure in the non-lossy layer, so that the application flexibility is obviously improved.

The application provides a solar panel heat exchanger and a heat exchange method thereof. The solar panel heat exchanger comprises a shell with an inner cavity, a bottom plate sealed to one side of the shell, cold fluid channels and hot fluid channels arranged in the inner cavity, a glass cover plate arranged on the other side of the shell, and a heat absorption plate arranged in the inner cavity. An air layer is formed in the interlayer between the glass cover plate and the heat absorption plate. The cold fluid channels and the hot fluid channels are arranged in the direction from the air layer to the bottom plate in sequence. A plurality of baffles are arranged in the cold fluid channels to form meandering channels. A plurality of baffles are arranged in the hot fluid channels to form meandering channels. The meandering channels in the cold fluid channels have the same trend as the meandering channels in the hot fluid channels. The application can make full use of solar energy, form a double heat source heat exchange structure together with the hot fluid channels, and improve the heat exchange efficiency of the panel heat exchanger.

The invention provides an anti-optical crosstalk structure of a double-layer light guide plate and a preparation method of the anti-optical crosstalk structure. The structure comprises an upper-layer light guide plate and a lower-layer light guide plate which are oppositely arranged in parallel, and an air layer is formed between the two light guide plates; the SiO2 plating layer is arranged on the lower surface of the upper-layer light guide plate and / or the upper surface of the lower-layer light guide plate; the side edge light blocking structure is arranged on the light incident side edge of the upper-layer light guide plate and / or the lower-layer light guide plate. Interface transmission optical crosstalk caused by Fresnel reflection is inhibited through the SiO2 plating layer, small-angle light at the edge of a light source is intercepted through the side light blocking structure, and optical crosstalk is inhibited from two dimensions through the synergistic effect of the SiO2 plating layer and the side light blocking structure; meanwhile, square OCA glue is adopted to be attached to non-display areas on the peripheries of the two layers of light guide plates, transparent supporting microbeads are evenly distributed on the edges of the inner sides of the non-display areas, and it is guaranteed that the thickness of an air layer is even and stable. The vehicle-mounted optical crosstalk preventing device is compact in structure and good in optical crosstalk preventing effect, the lighting optical crosstalk rate of the upper layer can be reduced to 3.2%, the lighting optical crosstalk rate of the lower layer can be reduced to 1.8%, and the use requirement of the vehicle-mounted harsh environment is met.

The invention discloses a multi-layer composite heat preservation pipeline with a built-in vacuum air layer and an integrated production device of the multi-layer composite heat preservation pipeline, and relates to the technical field of composite pipes. A peelable inner film is bonded to the inner side of an outer protection pipe, a working pipe is arranged in the peelable inner film, and the space between the working pipe and the peelable inner film is filled with a polyurethane heat preservation layer; the forming assembly is arranged on one side of the extruder, the extrusion die is arranged on one side of the extruder, the extrusion block is installed in the middle of the extrusion die, the vacuum sizing mill is arranged on one side of the extruder, the air exhaust heat sealing machine is arranged on one side of the vacuum sizing mill, and the supporting preheating assembly is arranged between the heat sealing machine and the polyurethane filling machine. According to the design, the vacuum layer and the shell are integrated, the mechanical strength is high, the vacuum service life is long, the vacuum layer effectively blocks heat radiation and convection and cooperates with the polyurethane heat preservation layer, the heat conductivity coefficient is far lower than that of a traditional heat preservation pipe, and the problem that polyurethane is prone to being damped and aged after being used for a long time is solved.

As shown in the reference diagram, this product is an indoor sound-absorbing board comprising a peripheral wall and a perforated plate, with a rear air layer defined by the peripheral wall and the perforated plate. The peripheral wall is positioned in the front, up / down, and left / right directions relative to the perforated plate. The rear air layer is defined by closing the opening in the peripheral wall with the perforated plate. The holes formed in the perforated plate are entry and exit points for sound to and from the rear air layer. The parts for which registration is sought are the left / right peripheral wall and the perforated plate (excluding the holes), and because the perforated plate is curved, multiple different resonance frequencies are set for each region where the depth (thickness) of the rear air layer is steplessly non-uniform, thus having a function and use that enhances the sound absorption effect.