113results about How to "Reduce conduction" patented technology

The utility model discloses a fluoroplastic insulating high-temperature-resistant fireproof cable, which comprises a cable core, the cable core comprises eight wire cores which are annularly distributed at equal intervals, each wire core is composed of an inner sheath and a conductor, a composite insulating outer layer is wrapped outside the cable core, the composite insulating outer layer is composed of a contact layer, a buffer layer and a reinforcing layer, and the contact layer is wrapped outside the buffer layer. A composite high-temperature-resistant layer is arranged outside the composite insulating outer layer, the composite high-temperature-resistant layer is composed of a high-temperature-resistant base material, a heat reflecting layer and a heat-resistant protective layer, and the composite high-temperature-resistant layer is wrapped with an outer sheath. The problems of cable stability, flame-retardant and fireproof performance, electrical performance, chemical corrosion resistance and large-current transmission capability in a high-temperature environment are solved.

The invention provides a baking lamp for surgical nursing, and relates to the technical field of nursing instruments. The baking lamp for surgical nursing comprises a base, a connecting column is arranged at the position, close to the rear side edge, of the center of the upper end face of the base, the upper end of the connecting column is movably connected with a first supporting rod through a first connecting piece, and the upper end of the first supporting rod is movably connected with an adjusting structure through a second connecting piece; the other end of the adjusting structure is connected with a lighting structure, the lighting structure comprises a lampshade, a bulb is arranged in the lampshade, a storage groove is formed in the center of the lower end face of the lampshade, a folding sleeve is fixedly connected to the interior of the storage groove, and a protective ring is fixedly connected to the lower end of the folding sleeve. By arranging the lighting structure, when a light source is scattered and the whole support is inconvenient to adjust during use, the folding sleeve connected with the protective ring is pulled out downwards to form a fence, scattering of the light source is reduced, pertinence is higher, and adjuvant therapy is better facilitated.

The invention discloses a lightweight high-strength power cable based on a composite material and application thereof, belongs to the technical field of cable preparation, and aims to solve the technical problem that the lightweight and anti-electromagnetic interference performance of a lightweight cable in the prior art needs to be further improved. The cable comprises a conductor layer, a light shielding layer, a wrapping layer and a composite sheath layer which are sequentially arranged from inside to outside, modified carbon spheres are introduced into a titanium dioxide aerogel structure for filling and loading copper particles, obtained composite aerogel serves as a filling material of the light shielding layer, the modified carbon spheres serve as a cross-linking agent and a filling material of light polyurethane, and the light shielding layer and the composite sheath layer are formed. The composite aerogel and the lightweight polyurethane significantly reduce the density of the cable and significantly improve the lightweight performance of the cable, and through the synergistic cooperation of the copper particles, the titanium dioxide aerogel structure and the hollow carbon spheres, the anti-electromagnetic interference performance of the material is significantly improved.

The invention discloses a translational photon optical shutter device capable of being combined with multiple inserts, and the device is characterized in that the device comprises an optical shutter switching assembly, a vacuum chamber, a driving mechanism, and a hinge assembly; the optical shutter switching assembly and the hinge assembly are installed in the vacuum chamber, and the driving mechanism is located outside the vacuum chamber. The driving mechanism drives the optical shutter switching assembly to do reciprocating translation through the hinge assembly and is used for switching control over light passing and light blocking of synchrotron radiation light. An absorber is arranged in the optical shutter switching assembly, the top of the absorber is a light receiving face, and the light receiving face comprises a plurality of inclined faces which are obliquely upward in the incidence direction of synchrotron radiation light and used for blocking the synchrotron radiation light generated by various insertion pieces at the same time. The design of the multi-inclined-plane absorber can block synchrotron radiation light generated by various inserts at the same time, so that the valuable axial space occupied by the device in a light beam line is effectively shortened, and a solid technical basis is provided for the design and layout optimization of the light beam line combined by multiple inserts.

This invention discloses a polymer material heating and pressing device, including a base with a placement mold mounted on the top; an upper plate positioned directly above the base, with guide posts mounted at the four corners of both; a pressing mold also positioned at the bottom of the upper plate; a stud penetrating the upper plate and threadedly connected to it, with the bottom end of the stud connected to the pressing mold; and a protective component mounted on the pressing mold and placement mold. In this invention, the protective component effectively isolates the heat released by the pressing mold during operation, fundamentally avoiding the risk of burns to workers due to accidental contact with the high-temperature pressing mold, and significantly improving the safety of the entire operating environment. Furthermore, in the design of the heating area, by optimizing the layout of the heating elements, the heating area is precisely concentrated in the pressing area of ​​the polymer material. This change allows the heat to act more directly and effectively on the material.

The invention relates to the field of electromagnetic compatibility, and discloses a simplified circuit design method and system for a high-efficiency EMC suppression rectifier diode, and the method comprises the steps: recognizing an interference frequency range of a diode application scene, determining a passive element and an active element of the diode application scene, and building a passive filter of the diode application scene; establishing an active filter of a diode application scene, and combining the passive filter and the active filter to obtain a multi-stage filter; establishing a protection circuit of the multi-stage filter and the target rectifier diode, and constructing a diode integrated circuit of the protection circuit, the multi-stage filter and the target rectifier diode; and simulating the diode integrated circuit to obtain EMC suppression data, calculating a circuit parameter value of the diode integrated circuit, and executing circuit optimization of the diode integrated circuit to obtain a target integrated circuit. According to the invention, the EMC suppression effect of the rectifier diode can be improved.

The present invention discloses a zebrafish temperature-sensitive behavior trajectory monitor and monitoring method, which is provided with a monitoring box, the inner bottom surface of which is provided with a heating box, and the interior of the monitoring box is provided with a warm zone, a normal temperature zone and a low temperature zone from left to right, respectively, and a monitor is installed on the outside of the monitoring box; a box cover is clamped and arranged on the top of the monitoring box, and a fan is installed on the upper end surface of the box cover; it includes: a fixed pipe, the top of which is fixedly connected to the bottom of the fan, and the sides of the fixed pipe are connected to each other through a connecting pipe and a supporting block; a partition plate is fixed inside the monitoring box and serves to separate the warm zone, the normal temperature zone and the low temperature zone, and the two ends of the partition plate are provided with fixed cavities, and a connection channel is reserved inside the partition plate. The zebrafish temperature-sensitive behavior trajectory monitor can reduce the mixing between water flows in different areas by partitioning the inside of the monitoring box and realizing heat insulation of adjacent partitioned areas, thereby improving the accuracy of monitoring data.

This application relates to a multi-isothermal stamping die, belonging to the field of stamping die technology. The multi-isothermal stamping die includes a lower stamping die, an upper main die base, and side die bases. The lower stamping die is provided with a lower die base for placing forgings. The side die bases include a left die base and a right die base. The left die base includes a left sliding block and a left die body disposed on the left sliding block. The right die base includes a right sliding block and a right die body disposed on the right sliding block. Both the left and right die bodies are equipped with a first heating element for heating. The lower die base is provided with a second heating element. The left and right die bodies abut to form a product forming cavity. The left die base, right die base, and lower stamping die are all provided with heat insulation structures to reduce heat loss. This application has the effect of heating the product forming cavity, ensuring the temperature stability of the stamping area, and improving the forming effect.

The utility model relates to the technical field of heat exchangers, and discloses a heat exchanger for chemical engineering, which comprises a pipe body, one side of the pipe body is fixedly connected with a connecting block, the outer surface of the connecting block is fixedly connected with a first flange, one side of the first flange is movably connected with a second flange, and the second flange is fixedly connected with the pipe body. A tube box is fixedly connected to the inner surface of the second flange, supporting legs are fixedly connected to the bottom of one side of the tube box, and a heat preservation sleeve is movably connected to the outer surface of the tube body, so that heat loss in the heat exchange process is reduced, and the efficiency of the heat exchanger can be improved by reducing the heat loss and the heat preservation sleeve; meanwhile, workers can be prevented from being scalded by the high-temperature pipe body, heat is prevented from being dissipated from a seam by conducting sealing treatment on the pipe body and the pipe box, and therefore the efficiency of the heat exchanger is improved, the maintenance frequency of equipment can be reduced, the frequency of replacing parts can be reduced, and the downtime can be shortened.

The invention relates to the field of household appliance design, in particular to a cooling structure of an air fryer, which comprises an air fryer body and two inner containers connected in the air fryer body in a drawing manner, a plurality of symmetrical air inlet holes are formed in the inner rear end of a shell of the air fryer body, and hot air output holes are formed in the rear end surfaces of the inner containers. An air inlet cavity is reserved in the air fryer body, symmetrical heating cavities are reserved in the rear sides, close to the two inner containers, of the air fryer body, gaps are reserved between the two heating cavities and the air inlet cavity, and a plurality of symmetrical exhaust holes are formed in the bottom of a shell of the air fryer body. Through the multi-layer structure of the air inlet hole, the air inlet cavity, the air duct shell, the outer flow guide cover, the inner flow guide cover and the like, a complete cold circulation system which sucks cold air from the outside, circulates in the air to take away heat and finally discharges the heat from the exhaust hole is formed, and it is ensured that the shell temperature of the air fryer body is effectively controlled; and shell deformation and scalding risks caused by high temperature are avoided.

The utility model relates to long water gap related technical field especially relates to a glaze anti -crack type long water gap, the inside of long water gap ladle end, long water gap middle transition section and long water gap tundish end all is equipped with buffer composite component, the inner wall of long water gap ladle end, long water gap middle transition section and long water gap tundish end is provided with anchor assembly. The utility model discloses through the setting of buffer composite component, through the gradient change's honeycomb hole and hole, the nanometer heat conduction coating of dynamic adjustment heat conduction efficiency, realizes thermal stress dispersion and temperature regulation, and buffer composite component cooperates anchor assembly and anchors gradually complementary, and the destruction of heat stress to glaze layer is reduced to heat dissipation and buffer structure, and the anchor structure guarantees that glaze layer does not fall off under certain thermal stress and external force effect, and the anti -crack of long water gap glaze is realized together, and the overall performance and service life of long water gap are improved.

The present disclosure provides a DMOS device with a junction field plate and its manufacturing method. A drain region is located on a surface of a semiconductor substrate. A source region is located in the semiconductor substrate at a bottom of a first trench. A gate electrode is located at the bottom of the first trench. Therefore, longitudinal voltage resistance is achieved, which may reduce a size of the entire device, decrease Rdson, and greatly optimize a relationship between voltage resistance and Rdson. The junction field plate improves an effect on reducing surface resistance. At the same time, a depth of trenches in the DMOS device may be reduced, and thereby a depth-to-width ratio of the device is reduced, improving the feasibility of increasing a voltage resistance level. Both the source region and the drain region in the DMOS device are led out on a same surface, which may be compatible with a technology for manufacturing a CMOS device. A second doped polycrystalline silicon layer includes a first doped sublayer and a second doped sublayer with different conduction types. Therefore, in a case of an N-type gate electrode, a P-type doped layer may be directly connected to a potential of the gate electrode, which improves an effect of the junction field plate.

The invention discloses a formula and a preparation method of a reflective heat-insulating coating for a metal roof, comprising the following raw materials in parts by mass: 50-57 parts of styrene-acrylic emulsion, 12-15 parts of titanium dioxide, 10-15 parts of nano titanium dioxide, 16-18 parts of modified ceramic hollow microspheres, 16-20 parts of deionized water, 2-3 parts of a film-forming aid, 0.3-0.5 parts of a defoaming agent, 0.1-0.3 parts of a preservative, 0.06-0.12 parts of a multifunctional aid, 0.1-0.2 parts of a dispersant, and 0.4-0.6 parts of a thickener. The nano titanium dioxide is rutile nano titanium dioxide that has been surface treated with inorganic substances, and the modified ceramic hollow microspheres are ceramic hollow microspheres that have been modified with nano zinc oxide. The invention can significantly improve the anti-ultraviolet performance of the coating, reduce the damage of ultraviolet rays to the coating, and increase the service life by adding nano-grade titanium dioxide to the reflective thermal insulation coating for metal roofs. By adding modified ceramic hollow microspheres to the reflective thermal insulation coating for metal roofs, the heat transfer inside the building can be effectively reduced and the indoor temperature can be lowered.

The utility model discloses a low-energy-consumption building external wall insulation board structure which comprises an insulation board base material layer, an airtight layer is fixedly arranged on the inner side face of the insulation board base material layer, an inner heat insulation layer is fixedly arranged on the inner side face of the airtight layer, an inner protection layer is fixedly arranged on the inner side face of the inner heat insulation layer, and a structural layer is fixedly arranged on the outer side face of the insulation board base material layer. Compared with the prior art, the novel structure has the advantages that the heat reflection layer and the airtight layer are introduced, heat conduction and absorption are effectively reduced, the heat preservation effect is improved, and energy consumption of a building is reduced; water permeation is effectively prevented, the waterproof performance of the insulation board is improved, the deformation problem caused by water absorption expansion of an insulation material is avoided, the structural stability of the insulation board is enhanced by introducing the structural layer, the durability of the insulation board is improved, and the service life of the insulation board is prolonged.

The present application proposes an electrochemical device, comprising a shell, an electrode assembly, a first pole ear, a first seal and a first layer. The electrode assembly is arranged in the shell. The first pole ear is electrically connected to the electrode assembly and extends out of the shell from the shell, and the first pole ear includes a first part arranged in the shell. The first seal is arranged on the first pole ear, and at least a part of the first seal is bonded to the shell. The first layer is arranged on at least a part of the surface of the first part, and the thermal conductivity of the first layer is less than or equal to 0.5w / (m·k). The electrochemical device provided in the present application has high safety when overcharged. The present application also provides an electronic device.

The utility model discloses an inflatable heating and hydrops bag integrated body position blanket for lithotomy body position, which comprises a waterproof pad, a heating pad, a liquid storage bag, a liquid storage bag, a liquid storage bag, a liquid storage bag, a liquid storage bag, a liquid storage bag and a liquid storage bag, and is characterized in that the waterproof pad is cushioned on an operating table; the inflatable cushion is arranged on the waterproof cushion and is internally provided with a heating structure; the liquid collecting bag is connected to one end of the waterproof pad and used for receiving urine and blood; the inflatable cushions are divided into a plurality of parallel groups; the utility model relates to the technical field of medical instruments. According to the inflatable heating and hydrops bag integrated body position blanket for the lithotomy body position, the waterproof pad capable of being inflated and heated is arranged under a patient, use is more comfortable, the inflatable head ring can prevent pressure injury behind a pillow, the sacrococcygeal inflatable ring supports and suspends the sacrococcygeal portion, pressure injury of the sacrococcygeal portion can be prevented, and the patient can use the body position blanket for the lithotomy body position. The liquid collecting bag arranged on one side can be used for collecting urine and blood to facilitate metering, and clinical problems of prevention of hypothermia and pressure injury, accurate metering and the like in the operation can be solved at the same time.

The invention provides an electrolyte of a high-safety sodium ion battery, which comprises the following components: a solvent which takes propylene carbonate (PC) as a main solvent and contains ethylene carbonate (EC) and dimethyl carbonate (DMC); the coalescing agent is fluoroethylene carbonate (FEC) and 1, 3-propane sultone (1, 3-PS); conducting salt: sodium perchlorate (NaClO4); additives: acesulfame sodium and a proper amount of sodium nitrate. The sodium ion battery provided by the invention has more excellent properties.

The utility model discloses an SPC stone-plastic floor with a detachable decorative layer, which comprises an SPC stone-plastic floor main body, an SPC stone-plastic floor decorative layer, an SPC stone-plastic floor silencing cavity, an SPC stone-plastic floor position fixing support column, an SPC stone-plastic floor decorative layer fixing buckle, an SPC stone-plastic floor hollow connecting hole, an SPC stone-plastic floor lower meshing protrusion and an SPC stone-plastic floor upper meshing protrusion. Decorative layer fixing buckles are arranged at the lower end of the SPC stone-plastic floor decorative layer and matched with central control connecting holes of the lower-layer SPC stone-plastic floor, so that the decorative layer is detachable, meanwhile, SPC stone-plastic floor supporting columns are arranged at the bottommost end of the SPC stone-plastic floor, the stone-plastic floor is prevented from shifting in the treading process, and the service life of the SPC stone-plastic floor is prolonged. And meanwhile, the silencing cavity is formed in the stone-plastic floor body, so that part of noise can be counteracted, and noise transmission is reduced.

The invention relates to the technical field of vibration measurement, and discloses a wireless energy transmission vibration sensor for vibration monitoring of a generator runner, which comprises a heat insulation and conduction protection mechanism and a transmitting circuit module, an acquisition mechanism, a wireless module, a receiving circuit module, a signal processing unit and a magnetostriction actuator are arranged in the heat insulation and conduction protection mechanism, the wireless module is arranged at the output end of the acquisition mechanism, and the receiving circuit module is arranged at the input end of the wireless module and the input end of the signal processing unit. According to the wireless energy transmission vibration sensor for generator runner vibration monitoring, the resonant frequency can be controlled through the magnetostriction actuator when the sensor is used, that is, the coupling capacitance is adjusted through the magnetostriction actuator according to the characteristic that the magnetostriction rod is stretched or shortened in the magnetization direction when being magnetized, and then the resonant frequency is adjusted; therefore, self-tuning is realized, and high-efficiency transmission is ensured.

The utility model relates to the technical field of temperature measurement, and discloses a plug type calorimeter which comprises a shell and a limiting body in threaded connection with the shell, a junction ball is fixedly installed on the top face of the limiting body, a wiring assembly used for being connected with a wire is arranged on the wall face of the limiting body, and the wiring assembly comprises an abutting rod, a ball socket, a wiring column and a supporting body. The abutting rods are detachably connected with the limiting body, the binding posts are fixedly connected with the abutting rods, the supporting body is detachably connected with the abutting rods, ball sockets are formed in the wall faces of the abutting rods, and through the two obliquely-extending abutting rods, when the limiting body is fastened, the abutting rods are squeezed by the bottom of the base body till the abutting rods are attached to a knot ball; according to the scheme, the junction ball and the thermocouple wire are connected more conveniently, only the thermocouple wire and the binding post need to be connected and locked in the assembling process, and the junction ball and thermocouple wire connecting structure has the advantages of being convenient to assemble, high in efficiency and stable and firm in connection.

The utility model relates to the technical field of metal clad steel plates, and provides a metal clad steel plate with a heat preservation function, which comprises steel plate layers, the steel plate layers are distributed in parallel up and down, adhesive combination layers are arranged on the inner sides of the upper and lower steel plate layers, and a composite connecting layer is distributed between the upper and lower adhesive combination layers; the composite connecting layer comprises a honeycomb connecting plate positioned between the upper and lower adhesive combination layers; the composite heat preservation blocks are arranged in each honeycomb hole in the honeycomb connecting plate; a plurality of hexagonal butt joint bosses are arranged on the inner side faces of the upper gluing combination layer and the lower gluing combination layer, and the multiple butt joint bosses are correspondingly connected to the honeycomb connecting plate in a clamped mode. The metal clad steel plate has excellent thermal insulation performance, stable and durable structure and lightweight design, can keep stable temperature in various environments, prolongs the service life, reduces the energy consumption and maintenance cost, improves the use convenience and economy, and is a novel material with wide application prospects.

The invention relates to the technical field of composite cloth, in particular to breathable cool sandwich composite cloth and a production method thereof. The composite cloth is composed of a surface layer, a middle layer and an inner layer, and the surface layer is made of polypropylene fibers; the middle layer is made of modified polyurethane fibers; and the inner layer is prepared by mixing polyester fibers and linen fibers according to the mass ratio of (7-8): (2-3). The inner layer of the composite cloth is made of the polyester fibers and the linen fibers, the composite cloth is good in hygroscopicity, capable of providing cool feeling and comfortable to wear, the middle layer is made of the modified polyurethane fibers, the heat conduction performance is improved, heat can be rapidly dissipated, the surface layer is made of the polypropylene fibers, the strength of the composite cloth is guaranteed, and the overall air permeability of the composite cloth is good. The cool feeling effect is strong, and the wearing comfort is high.

The utility model relates to the technical field of gas stoves, in particular to an energy-gathering pot rack and a gas stove. The energy-gathering pot rack comprises an energy-gathering ring and a plurality of supporting legs, the energy-gathering ring is of an integrated structure, the energy-gathering ring is formed by bending a hollow part, and a hollow cavity of the hollow part forms a heat insulation cavity of the energy-gathering ring; and the plurality of supporting legs are arranged at the upper end of the energy gathering ring. The energy-gathering ring is of the integrated structure and is specifically formed by bending the hollow part, so that only two ends of the hollow part need to be connected when the energy-gathering ring is formed, the number of connecting points is small, the process is simple, the hollow cavity of the hollow part can naturally form a heat insulation cavity of the energy-gathering ring after the hollow part is bent and formed, and the heat insulation effect is good. A heat insulation cavity does not need to be independently arranged, and the process is further simplified; in addition, the heat insulation cavity can effectively gather heat, reduce outward radiation of the heat and improve the heat efficiency, meanwhile, the heat insulation cavity can effectively reduce conduction of the heat to the panel and reduce temperature rise of the panel, and the problem that the panel bursts due to excessive local temperature rise of the panel is solved.

The utility model relates to a pot support technical field, more particularly to a pot support, the pot support includes a support ring and a flange, the flange sets up at the top of support ring, and the bottom surface of flange keeps the spacing with the top surface of support ring, the flange extends along the direction of center of support ring, or the flange extends along the direction of far from center of support ring, can provide the combustion efficiency of burner like this, and it is convenient for cleaning and arrangement.

This application provides a silicon rod growth system, comprising: a growth furnace; a cooling element disposed within the growth furnace, the cooling element having a first channel; and a heat insulation sleeve at least partially disposed within the first channel, the heat insulation sleeve having a second channel, the second channel and the first channel at least partially overlapping. In this application, since at least a portion of the heat insulation sleeve is disposed within the first channel of the cooling element, and the heat insulation sleeve has a second channel, during the feeding stage, material can be fed into the growth furnace using the second channel of the heat insulation sleeve. During the melting stage, when the heat flow generated by the molten material in the growth furnace flows vertically, and the heat flow flows into the second channel of the heat insulation sleeve and conducts heat to the heat insulation sleeve, the heat insulation sleeve itself can prevent the heat from being conducted from the second channel to the cooling element, thereby reducing the amount of heat conducted from the growth furnace to the cooling element and reducing heat waste. This significantly improves the melting efficiency during the melting stage.

The application relates to a cleaning device. The cleaning device comprises a frame, a cleaning assembly, a hand lever assembly, a water injection assembly and a switch assembly. The cleaning assembly comprises a cleaning roller which is rotatably connected to the frame. The hand lever assembly is connected to one end of the frame which is away from the cleaning assembly. The water injection assembly comprises a water tank and a hose. The water tank is mounted on the hand lever assembly. One end of the hose is connected to the water tank. The hose is partially arranged in the hand lever assembly and partially arranged in the frame, so that one end of the hose which is away from the water tank can inject water into the cleaning roller. The switch assembly is at least partially mounted on the hand lever assembly to realize the conduction or blockage of the hose.

The invention belongs to the technical field of architectural ceramics, and particularly discloses a low-thermal-conductivity ceramic rock plate and a preparation method thereof. The ceramic rock plate sequentially comprises a green body, a first cover glaze layer, a second cover glaze layer, a pattern layer and a protective glaze layer from bottom to top, wherein the first cover glaze layer is prepared from the following raw material components: silica powder, wollastonite, nano montmorillonite, glass fibers, potassium feldspar, albite, calcite and boron frit powder; the second cover glaze layer is prepared from the following raw material components: halloysite, montmorillonite, hydromica, pearlite, dickite, nepheline, wollastonite and barium-strontium frit powder. The two surface glaze layers both have low heat conductivity coefficients, can effectively isolate the cool degree of a green body and reduce heat conduction, so that the ceramic rock plate has proper touch temperature, and the ice-cold feeling is reduced. The heat conductivity coefficient of the ceramic rock plate is 0.50-0.55 W / m.K, the wear resistance of the ceramic rock plate can reach grade 5, and no residual stain is left in an antifouling property test; and the glaze surface is smooth, fine and rich in texture.

The utility model relates to the technical field of sweet potato storage, and discloses a sweet potato storage tank which comprises a tank body, a double-layer structure and a ventilation structure. The tank is used for storing sweet potatoes; the double-layer structure is arranged in the tank body and sinks towards the interior of the tank body, and the double-layer structure and the inner wall of the tank body jointly define a heat preservation space; and the ventilation structure is connected with the tank body. Through the arrangement of the double-layer structure, the temperature in the tank body is more stable, the fluctuation of the temperature can be reduced, the stored sweet potatoes are kept in a relatively stable environment, and the quality of the sweet potatoes is favorably kept. The arrangement of the ventilation structure can promote gas exchange inside and outside the tank, discharge of metabolites such as carbon dioxide in the tank is facilitated, meanwhile, fresh oxygen is supplemented, and the freshness of sweet potatoes is kept. Through the arrangement, the potato storage tank improves the heat preservation effect and the stability of the storage environment, and is beneficial to prolonging the fresh-keeping period of agricultural products and improving the quality.

The utility model relates to the technical field of vehicle braking systems, in particular to an electromagnetic type automobile brake. The utility model provides an electromagnetic type automobile brake which comprises a brake pad, a transmission rod and a first installation plate, an installation shell is arranged on one side of the brake pad, an electromagnet is placed in the installation shell, a wire penetrates through the installation shell to be electrically connected with the electromagnet, and the first installation plate is arranged on the side, away from the brake pad, of the installation shell. When the brake plate is treaded, the electromagnet attracts the brake pad to slide to be in friction with the brake pad for braking, and when the brake pad is excessively abraded, the electric sliding rod drives the first induction contact piece to be in contact with the second induction contact piece, so that an automobile central control circuit is switched on, an excessive abrasion signal of the brake pad is transmitted to an automobile central control, and a user is warned. Therefore, the effect of monitoring and early warning of excessive abrasion of the brake pad is achieved, potential safety hazards such as brake failure are eliminated to a certain extent, and driving safety is guaranteed.