144 results about "Air insulation" patented technology

The invention relates to the technical field of transformer manufacturing, in particular to an insulation heat dissipation structure of a high-voltage coil and a low-voltage coil and a coil of a dry-type transformer, the insulation heat dissipation structure comprises an insulation main body part, the insulation main body part is provided with a plurality of air channel insulation layers arranged in the radial direction, and each air channel insulation layer comprises an arc-shaped air channel distributed in the circumferential direction; an interval support is arranged between every two adjacent arc-shaped air channels, each interval support is of a thin-wall structure located in the axial plane, and the interval supports of the insulating layers of every two adjacent air channels are arranged in a staggered mode in the circumferential direction; a solid and air insulation fused composite insulation layer is formed between the high-voltage coil and the low-voltage coil, so that the insulation performance is better; and a creepage path is bent for multiple times between the high-voltage coil and the low-voltage coil, so that the creepage distance between the high-voltage coil and the low-voltage coil along the insulating surface is prolonged, the enough creepage distance determines the electrical safety of the transformer under normal work and abnormal voltage, and the operation stability of the transformer is improved.

The radio frequency coaxial cable comprises a sheath and a shielding layer wrapped on the inner surface of the sheath, the shielding layer and a cable core in the center are coaxially distributed, an insulating layer used for wrapping the cable core is contained in the cable core and the shielding layer, and through grooves distributed in the axial direction are further formed in the insulating layer. Wherein the through groove is used for forming semi-air insulation in the cable, and the through groove is also used for circulating air flow for operation cooling of the cable. According to the radio frequency coaxial cable, the related structure of the insulating layer is redesigned, on the basis of guaranteeing the supporting performance, the overall weight of the cable is effectively reduced, insulation is improved, a better cooling effect is achieved at the same time, and compared with the prior art, the radio frequency coaxial cable is more suitable for a high-load operation environment and an operation environment with higher external temperature.

The invention relates to a three-phase common box type fast grounding switch based on clean air insulation and a use method, the three-phase common box type fast grounding switch comprises a grounding shell, a moving contact, a static contact and a moving contact seat, an inner hole of the moving contact seat is in sealed sliding connection with a piston, the piston is fixedly connected with a pull rod, and one end, far away from the moving contact, of the moving contact seat is provided with a through hole in sealed sliding connection with the pull rod; the pull rod is in transmission connection with an output shaft of the spring mechanism through a transmission system; an air compression cavity is formed among the pull rod, the side wall of the moving contact seat and the piston, a blind hole penetrating to an inner hole of the moving contact is formed in the pull rod, the blind hole and the inner hole of the moving contact form an air injection cavity, and an air injection hole communicating the air compression cavity with the air injection cavity is formed in the side wall of the blind hole. The pull rod is used for driving the moving contact and the piston to move synchronously, the piston compresses the volume of the air compression cavity and increases the pressure in the air compression cavity while the moving contact is switched off, the spraying speed of clean air is increased, the arc extinguishing effect is improved, and therefore reliable arc extinguishing with the clean air as an insulating medium is achieved.

The invention relates to the technical field of high-voltage switch cabinets, in particular to an environment-friendly air-insulated high-voltage switch cabinet which comprises a cabinet body, a base is fixedly mounted on the cabinet body, a drying mechanism and a conveying mechanism are arranged on the cabinet body, and an absorption mechanism connected with the conveying mechanism is arranged on the base. The cabinet body is provided with a storage mechanism connected with the absorption mechanism, and a trigger mechanism is arranged between the absorption mechanism and the base; according to the invention, external conveying equipment is controlled to convey dry air to the inner sides of the plurality of spray pipes through the interfaces and the communicating shell, and the plurality of spray pipes spray the dry air to the space inside the cabinet body, so that air insulation work is carried out on the cabinet body.

The invention belongs to the technical field of ring main units, and discloses a ring main unit based on dry air insulation and intelligent monitoring. The ring main unit is provided with a cable chamber working bin, a numerical control monitoring mechanism and a protection mechanism, the numerical control monitoring mechanism is provided with a control chamber and a real-time monitoring assembly, the real-time monitoring assembly comprises a monitoring host and a conduction wire, and the monitoring host is used for monitoring working state parameters of a switch chamber in real time through the conduction wire; the protection mechanism is provided with a mechanism chamber and the switch chamber, and the switch chamber is filled with positive-pressure dry air and is provided with an epoxy resin composite insulator. Based on the above structure, a dual insulation system of dry air insulation and epoxy resin composite insulators is adopted, a basic monitoring architecture capable of sensing the state of a switch room in real time is constructed while environmental protection is realized to replace SF6, and the problems of environmental protection defects and state monitoring deficiency of a traditional gas insulation ring main unit are solved.

According to the warm-keeping shoe convenient to wear, the vamp is composed of the left vamp and the right vamp, the integrity is good, durability and attractiveness are improved, the shape can be kept, and the warm-keeping shoe is attached to the foot. The elastic piece at the upper end of the front side of the vamp can adjust the size of a welt, people with different foot types can conveniently wear the shoe, the left vamp and the right vamp are separately arranged and correspond to the elastic piece in deformation, and the foot can easily enter the shoe. The interlayer cavity in the vamp can hide the elastic piece, so that the shoe is more attractive, the external influence is reduced, the elastic piece is protected, and the structural strength of the shoe is enhanced. The fluff warm-keeping layer on the inner side face of the vamp is good in heat preservation performance, forms an air heat insulation layer and is durable in heat preservation. The fluff is soft and comfortable, does not press feet, relieves fatigue, is good in air permeability, keeps the interior of the shoe dry and comfortable, and reduces peculiar smell. The design pays attention to functionality, meanwhile, the attractiveness and practicability are considered, and the shoes which are convenient to wear, warm and comfortable are provided for consumers.

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 belongs to the technical field of blood detection sampling devices, and particularly relates to a blood detection sampling collector which comprises a main body and two first clamping grooves, a first connecting sleeve and a second connecting sleeve are inserted into the two first clamping grooves respectively, first clamping blocks are clamped with the interiors of the first clamping grooves, and second clamping blocks are clamped with the interiors of the second clamping grooves respectively. Limiting sleeves are clamped in the two limiting frames, rectangular grooves are formed in the bottoms of the two limiting frames, compression springs are fixedly connected to the inner tops of the limiting grooves, movable semi-rings are fixedly connected to the bottoms of the compression springs, fixing rings are fixedly connected to the inner side walls of the limiting sleeves, and diaphragms are fixedly connected to the interiors of the fixing rings. By arranging the limiting frame, the compression spring, the movable semi-ring, the limiting sleeve and the diaphragm, air isolation of a needle output hole is achieved, and pollution to blood in the main body caused by long-term exposure of the needle is avoided; and by arranging a first stop block and a second stop block, the two limiting frames can be conveniently limited by the limiting block.

1. The name of the design product: infrared temperature measurement window protection cover. 2. The use of the design product: for installation on the metal shell of air-insulated electrical equipment that cannot be directly opened due to safety production operation requirements, to perform infrared scanning temperature measurement on the internal connection parts. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The application discloses an air insulation structure verification method and device based on surface flashover voltage calculation, a terminal equipment and a storage medium, and belongs to the technical field of voltage testing. The method comprises the following steps: obtaining an original structure parameter set; establishing a three-dimensional model according to the original structure parameter set; performing steady-state simulation on the three-dimensional model to obtain an initial electric field distribution; correcting the initial electric field distribution according to surface roughness to obtain a first corrected electric field distribution; performing transient simulation on the three-dimensional model to obtain a surface charge density distribution; correcting the first corrected electric field distribution according to the surface charge density distribution to obtain a second corrected electric field distribution; accumulating the volume with a second corrected electric field value not less than a preset gas critical ionization field strength to obtain a critical volume; and calculating the surface flashover voltage based on the critical volume, and verifying the original insulation structure according to the surface flashover voltage. Therefore, by implementing the application, the problem of inaccurate surface flashover voltage calculation in the prior art can be solved.

This application discloses a fully dry, environmentally friendly rigid air-insulated cable terminal and its manufacturing method. It employs an integrated terminal block and a prefabricated bushing with pre-formed electrical stress components. During terminal installation, the cable is simply threaded through the base and then through the pre-formed bushing with electrical stress components, followed by wiring and sealing with the integrated terminal block. This rapid installation significantly improves efficiency. Furthermore, the pre-formed bushing with electrical stress components uses silicone rubber stress cones to divide the composite bushing into air-insulated and solid-insulated sections. This structure allows for the filling of the air-insulated section with atmospheric pressure air to create an air-insulated terminal, eliminating concerns about environmental pollution caused by insulation leakage.

The utility model relates to the technical field of material metallurgy technology, and discloses a heat preservation casting ladle structure of an iron casting, which comprises a casting ladle cylinder body, a high-temperature-resistant lining layer is arranged on the inner wall of the casting ladle cylinder body, a first heat preservation layer is fixedly arranged on the outer wall of the high-temperature-resistant lining layer, and a second heat preservation layer is fixedly arranged on the outer wall of the first heat preservation layer. A plurality of fan-shaped vertical cylinders are fixedly installed on the outer wall of the first heat preservation layer, a second heat preservation layer is fixedly installed on the outer walls of the fan-shaped vertical cylinders, and an outer wall is fixedly installed on the outer wall of the second heat preservation layer. Through mutual cooperation of the overall structures, the function of improving the heat preservation performance of the casting ladle is achieved, so that layer-by-layer isolation and heat reflection of casting liquid can be achieved through the double heat insulation layers and the air heat insulation layer, the durability of the casting ladle is improved, and the situation that the heat of the casting liquid is dissipated to the outer side is reduced; and meanwhile, the casting ladle can be prevented from being cooled by the external environment, so that the temperature stability of the casting liquid in the transportation and waiting process is ensured, and the problem of poor heat preservation effect of a single heat preservation layer of a traditional casting ladle is solved.

The present invention discloses a test method for equivalently simulating high altitude of an air-insulated isolating switch under dry conditions, comprising the following steps: 1) changing the temperature, air pressure, voltage and load capacitance in an artificial climate chamber respectively, and conducting a breaking test of the air-insulated isolating switch for breaking a capacitive low-current circuit; 2) measuring the distance between the isolating switch contacts at the moment of arc extinguishing under various atmospheric conditions; 3) constructing a fitting formula for the change of the distance between the isolating switch contacts at the moment of arc extinguishing as a function of temperature, air pressure, voltage and load capacitance; 4) calculating a correction factor formula for voltage with respect to temperature, air pressure and load capacitance; 5) determining an equation for voltage U and an equation for load capacitance C based on the correction factor formula; and 6) obtaining the voltage and load capacitance when equivalently simulating high altitude conditions under conventional altitude. This method can equivalently simulate high altitude and has the characteristics of being time-consuming and low-cost.

The utility model discloses a novel motor casing relates to motor technical field, including the mounting hole on the base of casing body and its bottom, and the mounting hole wall is circumferentially provided with one or more outward extending heat conduction groove, and this heat conduction groove penetrates casing body outer surface and is communicated with the inside of mounting hole. The structure constructs the heat dissipation channel that reaches the outside of casing through the mounting hole area, and the heat blocking problem that the small bolt head contact area, air insulation of traditional motor casing causes is solved. When the bolt and the inner wall of mounting hole contact, heat can diffuse to the external environment along the heat conduction groove, and the local temperature rise of base mounting hole area is reduced, and then material thermal aging and bolt pre -tightening force attenuation are avoided.

The utility model relates to the technical field of high-voltage power distribution, in particular to a large-corner isolating switch structure. The isolation switch comprises a frame and an isolation switch, the isolation switch comprises an isolation main static contact, a grounding main static contact, a main shaft, a moving contact push rod and a moving contact knife arm, the isolation main static contact and the grounding main static contact are respectively fixed at the upper end and the lower end of the frame, the grounding main static contact adopts a sinking structure, and one end of the moving contact knife arm is hinged to the frame and takes the hinged position as a swing circle center. The isolation main static contact and the grounding main static contact are located within the swing range of the other end of the moving contact knife arm, the two ends of the main shaft are rotationally connected to the frame and externally connected with a driving mechanism, and the two ends of the moving contact push rod are hinged to the main shaft and the moving contact knife arm respectively. According to the utility model, the grounding contact adopts a sinking structure, so that the distance between the isolation main static contact and the grounding main static contact is increased, and the requirement of opening distance of 125 mm under an air insulation condition is met.

The utility model discloses a heat-preservation energy-saving aluminum-clad wood window heat-preservation structure, and belongs to the technical field of building doors and windows. The problems that a traditional window is prone to causing heat loss, energy consumption increase and water seepage are solved. A window sash is arranged in the window frame, glass is arranged in the window sash, the heat preservation layer is arranged in a gap between the window frame and the window sash, the sealing assembly is arranged on the contact edge of the window frame and the window sash, and the heat preservation layer comprises a macromolecule heat preservation foam layer, an air heat insulation layer and a reflecting layer which are sequentially arranged from inside to outside. The energy-saving and environment-friendly energy-saving window can reduce loss of indoor heat, can effectively prevent heat transfer, and has an excellent heat preservation effect. External air and moisture are effectively prevented from entering a room, and the air tightness and water tightness of doors and windows can be effectively improved. The window has excellent durability and corrosion resistance, and the service life of the window is prolonged. The window is simple in structure, attractive, practical and easy to install, the natural aesthetic feeling of wood is reserved, meanwhile, the functionality of the window is improved, and the double requirements of modern buildings for attractiveness and practicability are met.

The utility model discloses a high heat-resistant engine suspension structure, which relates to the technical field of automobile parts and comprises a structure main body, a heat insulation gasket and a heat insulation sleeve, a second mounting bracket is mounted at the top end of the structure main body, and a first mounting bracket is mounted on one side of the structure main body. Heat insulation gaskets are arranged above the second mounting bracket and on one side of the first mounting bracket, insertion holes are formed in the front ends and the rear ends of the heat insulation gaskets, fixing springs are mounted at the front ends and the rear ends of the first mounting bracket and the second mounting bracket, and limiting plates are mounted at one ends of the fixing springs. Through the heat insulation sleeve with the air heat insulation cavity inside, external heat is isolated from the structure body by means of low heat conductivity of air, the heat is further blocked through the heat insulation gasket made of asbestos, glass fiber and other materials, and a heat transfer path is effectively blocked.

In a traditional bearing cap, the temperature of the oil-wetted surface that defines the oil sump may experience high temperatures, which can result in oil degradation, oil varnish, and coking. Accordingly, a bearing cap is disclosed that reduces the temperatures experienced by the oil-wetted surface. In particular, the bearing cap may comprise one or more air insulation cavities, between the surface that is exposed to heated air and the oil-wetted surface that defines the oil sump, to provide a thermal barrier between the two surfaces.

The 110kV dry-type transformer comprises three connected single-phase dry-type transformers, and each single-phase dry-type transformer comprises a high-voltage coil, a low-voltage coil and an iron core; the high-voltage coil is sleeved outside the low-voltage coil, and the low-voltage coil is sleeved outside an iron core column of the iron core; according to each single-phase dry-type transformer, one or more insulating partition plates used for reducing the spacing distance of single air insulators are arranged on the wire inlet side of the high-voltage coil, the upper ends and the lower ends of the high-voltage coil and the low-voltage coil and in the air insulators between the upper iron yoke and the lower iron yoke of the iron core respectively. According to the 110kV dry-type transformer provided by the invention, the insulating partition plates are arranged in the air among the wire inlet side, the high-voltage coil, the upper iron yoke and the lower iron yoke, on one hand, the lightning impulse insulation level of the high-voltage coil to the ground can be improved, on the other hand, the height size of the high-capacity dry-type transformer can be reduced, and the height limiting requirement of automobile transportation can be met.

According to the battery pack with the anti-extrusion structures provided by the invention, the first anti-extrusion structures are arranged at the gaps of the battery cells, so that when the battery pack is extruded, the battery cells in the battery pack do not collide with one another, the anti-vibration and heat-insulation effects are achieved, and a flame-retardant effect is achieved on short circuits caused by battery cell faults; the multiple pieces of foam are evenly arranged at intervals in the vertical direction, the foam arranged at intervals can form an air heat insulation layer, meanwhile, extrusion stress is dispersed, the situation that the foam loses efficacy due to local excessive compression is avoided, the multiple connecting structures are arranged at the top of the battery pack, displacement generated when the battery pack is extruded is buffered, and the multiple connecting structures are arranged in a staggered mode. And the second anti-extrusion structures are arranged at the two ends of the battery pack, so that the battery pack does not deform when being extruded.

The invention relates to the technical field of cables, in particular to a low-wind-resistance special cable for suspension wind power generation, which comprises a carbon fiber reinforced core, a TPV (thermoplastic vulcanizate) sheath positioned on the periphery of the carbon fiber reinforced core and a copper conductor positioned on the outer side of the TPV sheath, the outer side of the copper conductor is sleeved with a TPE insulating layer according to the length, and the outer side face of the TPE insulating layer adopts a low-wind-resistance surface pit design. According to the low-wind-resistance special cable for suspension wind power generation, the cable is designed into an upper part and a lower part, a low-altitude part is arranged below 20 meters, in order to ensure the use safety, a conductor + insulation + sheath + carbon fiber reinforced core structure is adopted, a high-altitude part is arranged above 20 meters, a conductor + sheath + carbon fiber reinforced core structure is adopted, and air insulation is adopted between conductors; the cable weight is reduced; the two strands of carbon fiber reinforced cores are combined into one strand and are arranged in the middle of the wire core, so that the tensile force is ensured, and the stability of the structure is ensured.

The invention discloses an environment-friendly inflatable cabinet and a use method, and belongs to the technical field of switch equipment. The environment-friendly inflatable cabinet comprises an inflatable part and a non-inflatable part; the inflating part comprises an upper inflating compartment and a lower inflating compartment; a three-station isolating switch is mounted in the upper inflation compartment, a vacuum circuit breaker is mounted in the lower inflation compartment, and the upper inflation compartment is communicated with the lower inflation compartment through an insulator; the three-station isolating switch comprises a switching-on contact, a middle static contact, a moving contact and a grounding contact; the moving contact can be controlled to be in contact with or disconnected from the connection contact by adjusting the left movement of the moving contact, and can be controlled to be in contact with or disconnected from the grounding contact by adjusting the right movement of the moving contact. According to the environment-friendly inflatable cabinet, the problems of uneven electric field distribution and insufficient creepage distance under a low-pressure N2 / dry air insulating medium are solved by optimizing the layout of the inflatable compartments and improving the design of the three-station isolating switch structure and the operating mechanism, and the environment-friendly requirement is met at the same time.

The invention provides a supporting insulator for a clean air insulation circuit breaker, and the insulator comprises an insulator main body which is of a conical cylindrical structure, the outer wall surface of the insulator main body is a corrugated smooth curved surface, and the inner wall surface of the insulator main body is an arc surface; the number of the shielding rings is two, the two shielding rings are arranged at the upper end and the lower end of the insulator respectively, the shielding ring located at the upper end is connected with an upper plate of the circuit breaker, and the shielding ring located at the lower end is connected with a supporting conductor of the circuit breaker. According to the supporting insulator for the clean air insulation circuit breaker, the problems that an existing movable side insulation support is low in mechanical strength, poor in insulation performance, poor in cooperation with other parts and the like are solved, and the performance and reliability of the circuit breaker are improved.

The present application relates to the technical field of cable, especially to a low wind resistance special cable for suspended wind power generation, comprising a carbon fiber reinforced core, a TPV sheath located at the periphery of the carbon fiber reinforced core and a copper conductor located at the outside of the TPV sheath; a TPE insulation layer is sleeved on the outside of the copper conductor according to the length, and a low wind resistance surface pit design is adopted on the outside surface of the TPE insulation layer. The low wind resistance special cable for suspended wind power generation of the present application designs the cable into two parts, the low altitude part below 20 meters, in order to ensure the safety, adopts the structure of conductor + insulation + sheath + carbon fiber reinforced core, the high altitude part above 20 meters, adopts the structure of conductor + sheath + carbon fiber reinforced core, air insulation is adopted between the conductors, the weight of the cable is reduced; two carbon fiber reinforced cores are combined into one and arranged in the middle of the wire core, the tensile force is ensured and the stability of the structure is ensured.

The invention discloses an electric arc simulation method of an HSS under clean air insulation and a related device, and the method comprises the steps: taking clean air as an insulating medium and an arc extinguishing medium, and building a two-dimensional axisymmetric geometric model of a DC high-speed parallel switch arc extinguishing chamber; calculating physical property parameters of the electric arc in the clean air based on the geometric model, wherein the physical property parameters comprise thermodynamic properties and transportation parameters; constructing a magnetohydrodynamic model according to a Navier-Stokes equation and the physical property parameters, wherein the magnetohydrodynamic model comprises a fluid equation and an electromagnetic field equation; based on a preset k-epsilon turbulence model, the magnetohydrodynamic model is solved through Fluent, and arc airflow field parameters are obtained; and performing arc simulation operation according to the arc airflow field parameters to obtain a target clean air arc. The technical problem that existing HSS application is not environment-friendly due to the lack of research on plasma characteristics and arc extinguishing capability of clean air HSS arcs in the prior art can be solved.

The utility model relates to an ultra-low energy consumption heat insulation window auxiliary frame which comprises a waterproof breathable film, a fixing strip, a decorative cover plate, a fixing plate, a gas insulation film, a filling material and a foam plate strip. The waterproof breathable film wraps the inner surface of the window frame, the fixing strips are arranged on the four edges of the window frame, and the length of the fixing strips is consistent with the width of the window frame; the air insulation film is arranged on the inner side of the decorative cover plate, the decorative cover plate is arranged at the position, 15 mm away from a keel, of a window frame, and the filling material is polyurethane and is used for filling a gap in the window auxiliary frame; the foam battens are installed at the positions of the keels of the outer window frame. The window auxiliary frame provided by the utility model not only can be constructed on site, but also can be assembled on site after being prefabricated together with the surface block board; the comprehensive cost of the window auxiliary frame is lower; the heat conductivity coefficient is better, and the cold bridge can be avoided.

The invention discloses a high-voltage bushing for clean air insulation. The high-voltage bushing comprises a bushing, a transition flange, a wiring terminal board, a connecting conductor, a bushing shielding case, a conductor shielding case, a transition conductor, a contact seat assembly and a bushing base assembly, an internal insulating medium of the sleeve is clean air; the connecting conductor is an aluminum conductor and extends into the sleeve base assembly to be transited into a copper conductor, and the transition position of a conductor material is arranged in a tank body of the sleeve base assembly; the wiring terminal board and the connecting conductor are of an integrated welding structure, and the bottom of the wiring terminal board is provided with a threaded hole and is assembled and plugged with the contact seat through the transition conductor; flanges at the two ends of the sleeve are provided with a plurality of sets of arc-shaped diagonal braces, and the diagonal braces and the flanges are of an integrated casting structure and used for optimizing electric field distribution and enhancing heat dissipation capacity. The conductor shielding cover covers the transition joint of the aluminum conductor and the copper conductor and is fixed on the transition conductor through a sunk screw; four circles of spring contact fingers are arranged in the contact seat assembly and are used for reducing plugging resistance and temperature rise.

A fire-resistant or fire-rated thermal glass unit that utilizes a thermal insulating glass component mated to a fire-resistant or fire-rated glass component, such as in a side-by-side relationship. An integrated unit is formed including, in some cases, a sealed chamber between the vacuum glass component and the fire-rated glass component that may be filled with air, an insulating gas, or that is structured to maintain a vacuum therewithin. In other instances, fire resistant materials may be used to fill the sealed chamber. The integrated unit can be installed in buildings and other desired locations to provide the benefits of both fire resistance and thermal insulation using a single unit.

This invention discloses an air-insulated ring main unit, comprising a ring main unit body, a fixed plate fixedly connected to the bottom of the ring main unit body, a fixed shaft fixedly connected inside the fixed plate, a roller rotatably connected to the outside of the fixed shaft, a rotating shaft rotatably connected inside the fixed plate and above the fixed shaft, and a locking mechanism provided outside the rotating shaft and on one side of the roller. This belongs to the technical field of ring main units. The air-insulated ring main unit features a first and second support plate that can be flipped and folded, achieving dual functions through state switching to adapt to different operating conditions. When the two sets of support plates are folded together, they can be spliced ​​to form a stable support base. When the support plates are fully unfolded, they cover the vulnerable four corners of the bottom of the ring main unit, forming a wrap-around anti-collision protective structure. This structure can resist impacts from hard objects and lateral scratches during cabinet transfer and handling, preventing deformation of cabinet corners, paint peeling, and cracking, effectively protecting the integrity of the cabinet structure.

The present invention discloses an air-cooled electromagnetic ultrasonic sensor, a detection system and a method, which relate to the field of industrial detection technology. The air-cooled electromagnetic ultrasonic sensor includes a sensor body and a fan. The sensor body includes a shell, a connecting block, a magnet and a coil assembly. The connecting block, the magnet and the coil assembly are sequentially arranged in the shell along a first direction. The connecting block and the coil assembly are respectively sealed to the inner wall of the shell. A first ventilation cavity, a second ventilation cavity and an air outlet duct are provided in the shell. The detection system includes a power supply, a detector and the above-mentioned air-cooled electromagnetic ultrasonic sensor. The method for improving the heat resistance of the electromagnetic ultrasonic sensor is to insulate the coil assembly through the second ventilation cavity and to dissipate heat by introducing flowing air into the second ventilation cavity. The second ventilation cavity itself can act as an air insulation layer to insulate heat, and the introduction of flowing air can also take away the heat of the coil assembly, thereby improving the heat resistance of the electromagnetic ultrasonic sensor.