207 results about "Air core" patented technology

The invention relates to the technical field of plastic product processing, and discloses a high-toughness plastic bag processing technology which comprises the following steps: firstly, primarily sorting recycled main raw materials, recording sources, grade classification and processing states, configuring a centralized feeding system and an intelligent proportioning program, and carrying out intelligent proportioning on the main raw materials; the mixed raw materials are injected into a five-layer co-extrusion die head or an annular die head structure, then an extrusion film body is controlled through a control system to conduct film blowing treatment on an extruded film to form film bubbles, then film blowing is conducted, the film bubbles are cooled through a 360-degree cooling air ring and an internal air core, the film obtained after film blowing is completed is pulled to a winding section through a winding system, and then the film is obtained. Before rolling, mechanical performance indexes are detected through an online monitoring instrument, and a finished film roll enters a bag making / slicing section according to order requirements. Through fine treatment and multi-layer co-extrusion process design of recycled plastics, high-proportion recycled materials are effectively applied to production of plastic bags, and the effect of remarkably improving the utilization rate of the recycled materials is achieved on the premise that the performance of finished products is not reduced.

The invention discloses an airtight packaging structure and a hollow-core optical fiber transmission system.The airtight packaging structure comprises a packaging shell, an air pressure adjusting device, an air pressure monitoring device and a control device, the packaging shell is provided with an air cavity, a packaging hole and a communicating hole, and the packaging hole and the communicating hole are both communicated with the air cavity; the air pressure adjusting device is provided with an air vent communicated with the communicating hole, the air pressure monitoring device is connected with the cavity wall of the air cavity so that the air pressure of the air cavity can be monitored through the air pressure monitoring device, and the air pressure monitoring device and the air pressure adjusting device are both electrically connected with the control device. The control device is used for receiving the real-time air pressure value monitored by the air pressure monitoring device and controlling the air pressure adjusting device to adjust the air pressure of the air cavity based on the real-time air pressure value. According to the airtight packaging structure, the pressure of the inner cavity of the hollow-core optical fiber can be maintained, water vapor, air and the like in the external environment are prevented from permeating into the inner cavity of the hollow-core optical fiber, and the stability of a communication system is guaranteed.

The invention discloses an ultra-wideband heterogeneous five-core anti-resonance optical fiber for transmission from ultraviolet to intermediate infrared, and belongs to the technical field of optical fiber communication. The heterogeneous five-core anti-resonance optical fiber sequentially comprises a perfect matching layer, an outer cladding layer, a first light guide unit, a second light guide unit, a third light guide unit, a fourth light guide unit and a fifth light guide unit from outside to inside along the fiber diameter, wherein the first light guide unit, the second light guide unit, the third light guide unit, the fourth light guide unit and the fifth light guide unit are arranged in the outer cladding layer. A plurality of nesting tube assemblies and gap tube assemblies with the same or different structures are arranged in each light guide unit in the circumferential direction at equal intervals, and a central air fiber core area, a left upper air fiber core area, a right lower air fiber core area, a right upper air fiber core area and a left lower air fiber core area are defined by the assemblies and work at the wave bands of 0.15-2.0 m, 2.0-3.0 m, 3.0-4.0 m, 4.0-6.0 m and 6.0-7.0 m correspondingly. And all the components show extremely low restrictive loss, dispersion close to zero and a relatively low nonlinear coefficient.

The invention provides a low-loss hollow-core anti-resonance optical fiber. The low-loss hollow-core anti-resonance optical fiber comprises an outer wrapping layer, a plurality of anti-resonance units arranged in the outer wrapping layer and a fiber core area defined by the anti-resonance units. The anti-resonance units are circumferentially arranged around the central axis of the outer cladding; each anti-resonance unit comprises a nested structure unit and a support structure for providing support for the nested structure unit, one end of each support structure is connected with the nested structure unit, and the other end of each support structure is connected with the inner wall of the outer cladding. By designing the layout mode of the anti-resonance units in the air fiber core unit, the target light beam is transmitted in the fiber core area with low loss, and the transmission capacity of the hollow-core anti-resonance optical fiber is improved.

The invention provides a hollow-core anti-resonance optical fiber and application and a manufacturing method thereof. The hollow-core anti-resonance optical fiber comprises a supporting tube; the multiple first cladding tubes are attached to the inner surface of the supporting tube at intervals in the circumferential direction of the supporting tube, and the first cladding tubes are configured to be of an anti-resonance structure; the middle plate is arranged in the supporting pipe and is configured to be of a resonant structure or an anti-resonant structure; wherein the middle plate and the plurality of first cladding tubes divide the internal space of the supporting tube into two basically symmetrical air fiber core areas. When the intermediate plate is configured to be of a resonant structure, the hollow-core anti-resonant optical fiber can support an LP11 transmission mode and has the characteristic of low limiting loss; when the intermediate plate is configured as an anti-resonance structure, the hollow-core anti-resonance optical fiber can support x polarization odd mode, x polarization even mode, y polarization odd mode and y polarization even mode transmission modes, has the characteristic of high transmission capacity, and can be applied to a polarization beam splitter.

The invention discloses a variable-diameter electromagnetic heating rotary kiln system, which belongs to the technical field of rotary kiln heating, and comprises a kiln body, and an electromagnetic heating coil formed by a hollow-core spiral lead is wound on an electromagnetic heating coil rack positioned outside a charging barrel; the electromagnetic heating coil is characterized in that the electromagnetic heating coil is formed by combining a preset number of independent electromagnetic heating coil units, and each independent electromagnetic heating coil unit comprises an electromagnetic heating coil rack and an electromagnetic heating coil; the charging barrel comprises a heating tube pass and a heat preservation tube pass; the inner diameters of the charging barrels of the heating tube pass and the thermal insulation tube pass are different, and the adjacent raising plates along the axis of the thermal insulation tube pass are symmetrically arranged in a staggered manner. The rotary kiln has the beneficial effects that the inner diameter of the charging barrel of the heat preservation tube pass is larger than that of the heating tube pass, on the premise that the occupied area is not increased, the calcination time of materials in the rotary kiln is prolonged, and the calcination capacity is improved; and the lifting plate ensures that enough calcining time is reserved for the materials in the rotary kiln under the condition that the materials are turned over, so that the materials are more uniform.

The invention relates to the field of hollow coil processing, in particular to a hollow coil winding method and device. A first fixing point and a second fixing point are preset; fixing one end of the copper wire at the first fixing point to form an initial wire; pulling the copper wire to a mandrel, driving the mandrel to rotate, simultaneously enabling the first fixing point and the second fixing point to coaxially rotate around the mandrel at the same angular velocity, and fixing the other end of the copper wire at the second fixing point after rotating for a preset number of turns to form a tail wire; and cutting off at preset cutting-off positions with the same distance from the core shaft on the starting wire and the tail wire respectively to obtain the hollow coil. According to the hollow coil winding method and device, compared with a traditional hollow coil machining method, the cutting precision of the head wire and the tail wire is guaranteed, the head wire end and the tail wire end of the coil do not need to be machined again after cutting is completed, the machining steps are simplified, the machining efficiency is improved, the consistency of the shape and performance of a product is guaranteed, and the production cost is reduced. And the product quality can be improved.

The present application relates to the field of new energy vehicle thermal management technology, especially to an integrated thermal management module and a vehicle. The integrated thermal management module comprises: a flow channel for conveying coolant is formed inside a flow dividing member; a power assembly is used to provide power for the coolant flowing in the flow channel; a switching assembly is in communication with the flow channel and comprises a first four-way valve and a second four-way valve; a warm air core inlet, a heat exchanger inlet, a heat exchanger outlet, an electric drive system inlet, an electric drive system outlet, a radiator inlet, a radiator outlet, a heater inlet, a heater outlet, a battery water pump inlet and a battery outlet are arranged on the side wall of the flow dividing member and are in communication with the flow channel. The present application has the advantages of simple structure, small size and easy installation, thereby reducing the weight of the whole vehicle, reducing the parts of the whole vehicle, reducing the cost, reducing the pressure loss of the whole vehicle system, improving the thermal efficiency of the thermal management system, making the vehicle energy-saving and comfortable, and improving the cruising range.

This invention discloses a composite hollow anti-resonant optical fiber, comprising an outer cladding layer, a doped layer, and an anti-resonant layer arranged sequentially from the outside to the inside. The anti-resonant layer includes multiple glass nested tubes evenly distributed circumferentially and tangent to the doped layer, with gaps between them. These glass nested tubes surround and form an air core. Each glass nested tube includes a circular outer nested tube and an elliptical inner nested tube located within the outer nested tube. The minor axis of the inner nested tube is arranged radially along the optical fiber, and the outer circle of the inner nested tube, away from the air core, is tangent to the inner circle of the outer nested tube, also away from the air core. This invention employs a multi-layer nested structure, optimizing the anti-resonance effect through the combination of the doped layer and the specially structured anti-resonant layer.

The application provides a control method and device, electronic equipment and storage medium, and relates to the technical field of human-computer interaction. The method comprises the following steps: firstly, in response to a temperature demand instruction input by a user, a high-voltage heater and a compressor are started in sequence; then, an in-cabin temperature, a warm air core inlet temperature and an ambient temperature collected by a sensor are acquired, and a PID control power of the high-voltage heater and a PID control rotating speed of the compressor are determined according to an air conditioner target temperature, the in-cabin temperature and the warm air core inlet temperature; finally, the operating power of the high-voltage heater is increased from an initial operating power to the PID control power, and the operating rotating speed of the compressor is increased from an initial operating rotating speed to the PID control rotating speed. In the application, the operating power control of the high-voltage heater and the rotating speed control of the compressor are automatically adjusted in real time by starting the high-voltage heater and the compressor in sequence, so that the vehicle-mounted heat pump air conditioning system can consider both the temperature control timeliness and the energy saving during operation.

The invention relates to an R290 electric vehicle thermal management system and a ten-way water valve and a controllable proportional four-way water valve thereof, and belongs to the field of electric vehicle thermal management. The system comprises a refrigerant loop and a cooling liquid loop. The refrigerant loop comprises an enhanced vapor injection compressor, a first refrigerant-water heat exchanger, a second refrigerant-water heat exchanger, a first electronic expansion valve, a second electronic expansion valve and a flash evaporator. The cooling liquid loop comprises a first refrigerant-water heat exchanger, a second refrigerant-water heat exchanger, a warm air core body, a cold air core body, a heat dissipation water tank, a ten-way water valve, a proportion-controllable four-way water valve, a four-way water valve, first to fourth electronic water pumps, an expansion kettle, a water heating positive temperature coefficient heater, a battery pack and a driving motor. The two loops exchange heat through the refrigerant-water heat exchangers. The ten-way water valve and the controllable-proportion four-way water valve comprise an upper cavity, a lower cavity and a motor. The invention aims to solve the problems of high refrigerant charge, high leakage risk, complexity of multifunctional heat management and the like in an automobile R290 heat pump system, and the safety and the environmental protection property of the system are improved.

The invention discloses a thermal management system and a vehicle, and relates to the field of thermal management. The heat management system comprises a cooling liquid side loop and a refrigerant side loop. The cooling liquid side loop is composed of an eight-way valve and four loops. The first loop comprises a radiator and an integrated electric control heat exchanger. The second loop comprises a battery heat exchange module; the third loop is connected with the warm air core body; the fourth loop is connected with the cold air core. The refrigerant side loop comprises a compressor, a condenser, an evaporator and a throttling element. The condenser and the evaporator are connected with the third loop and the fourth loop of the cooling liquid side loop through a first heat exchange channel and a second heat exchange channel respectively. In addition, an eight-way valve, a compressor and a controller device of a throttling element are arranged in the integrated electric control heat exchanger. According to the thermal management system, flexible switching of a plurality of loops can be achieved, and efficient and flexible management of the thermal load of the vehicle is achieved.

The invention discloses a bipolar direct-current excited oscillatory wave voltage generation circuit and method, and belongs to the technical field of electrical equipment tests.The oscillatory wave voltage generation circuit comprises a high-voltage direct-current power supply, a protection resistor RS, a high-voltage relay K1, a high-voltage switch S1, a high-voltage switch S2 and an air core inductor L; the cathode of the high-voltage direct-current power supply is grounded, the anode is connected with one end of the high-voltage relay K1 through the protective resistor RS, the other end of the high-voltage relay K1 is connected with the first end of the switch branch and the first end of the air-core inductor L, the second end of the air-core inductor L is connected with the first end of the tested cable C, and the second end of the switch branch and the second end of the tested cable C are grounded; the switch branch comprises a high-voltage switch S1 and a high-voltage switch S2 which are connected in series; the high-voltage switch S1 and the high-voltage switch S2 are high-voltage semiconductor switches connected in parallel with a freewheeling diode; and the direction of the fly-wheel diode of the high-voltage switch S1 is opposite to that of the fly-wheel diode of the high-voltage switch S2. The problem that in the prior art, oscillatory wave voltage may damage cable insulation is solved.

The invention relates to the technical field of vehicles, and discloses an HVAC assembly for a vehicle and the vehicle. The HVAC assembly comprises an air conditioning box, a first flow channel and a warm air core body; the air conditioner box is internally provided with an air duct and comprises a first side wall. The first flow channel is arranged on the first side wall, the first flow channel is used for circulating cooling liquid, and the first flow channel is provided with a first end and a second end in the length direction of the first flow channel; the warm air core body is arranged in the air conditioner box and at least partially located in the air channel, an inlet of the warm air core body communicates with the first end of the first flow channel, and an outlet of the warm air core body communicates with the second end of the first flow channel. According to the HVAC assembly, the integration degree is improved.

The invention discloses a building drainage system pressure stabilizing device and method based on S-shaped center deviation design, and belongs to the technical field of building drainage. In order to solve the problem that pressure fluctuation is large when a traditional S-shaped pipeline drains water, the device is composed of an S-shaped pipe, a thickened connector, an annular clamping groove, a sealing ring, a straight pipe cavity, a bent pipe cavity, a spiral blade and a flow guide plate. The S-shaped pipe is made of a high-density polyethylene material, and the inner wall of the S-shaped pipe is coated with a silver ion nano antibacterial coating; the inner wall is provided with an annular clamping groove which is clamped with an ethylene propylene diene monomer sealing ring; the inner wall of the straight pipe cavity is provided with annular array spiral blades, and the inner wall of the bent pipe cavity is provided with a flow guide plate matched with the bending degree. Water flow forms spiral wall-attached flow through the spiral blades, the spiral wall-attached flow and the central air core are directionally guided through the guide plates, the pipeline pressure is stabilized, smooth drainage is guaranteed, and the blocking risk is reduced.

The utility model relates to a connector, in particular to a pneumatic-electric mixed connector. Comprising a base, a gas core and a plurality of contact pins, the air core is installed in the middle of the base in a sealed mode, and the two ends of the air core extend out of the base respectively. A plurality of stepped through holes with the same number as the contact pins are formed in the end face of one side of the base around the air core; the contact pin comprises a head part, an insertion part and a tail part which are connected in sequence; the head part extends into the base from the large section of the stepped through hole and extends out of the base from the small section of the stepped through hole; conical barbs are arranged on the head part, and the head part is in interference fit with the inner wall of the small section of the stepped through hole through the conical barbs; the insertion part is arranged in the large section of the stepped through hole, and a first sealing ring is arranged between the insertion part and the large section of the stepped through hole. According to the utility model, the pins are installed around the gas core, so that the size of the connector can be reduced to a certain extent, and integration and miniaturization of components can be realized.

The utility model discloses an electric vehicle thermal management system and a vehicle. The electric vehicle thermal management system comprises a refrigerant circulation loop and a cooling liquid circulation loop which share a water-cooling condenser and a cooler. The cooling liquid circulation loop further comprises a battery pack, a motor assembly, a radiator, a water heater, a cold air core body, a warm air core body, a first three-way proportional valve, a second three-way proportional valve and a nine-way valve. A first port of the nine-way valve is connected with the battery pack, a second port is connected with the cold air core and the cooler, a third port is connected with the warm air core and the water-cooling condenser, a fourth port is connected with the first three-way proportional valve, a fifth port is connected with the second three-way proportional valve, and a sixth port and a seventh port are connected with the two ends of the radiator respectively. The sixth port and the eighth port are connected with the two ends of the motor assembly respectively, and the ninth port is connected with the battery pack. The flow path of cooling liquid is switched through the nine-way valve, the first three-way proportional valve and the second three-way proportional valve, different function modes can be achieved, the number of system valves is small, the integration degree is high, and the system is suitable for combustible refrigerants.

The invention discloses a hollow-core anti-resonance optical fiber design method and system for a femtosecond laser stone crusher, and relates to the technical field of medical laser instruments. The method comprises the steps that an anti-resonance transmission unit is constructed, the anti-resonance transmission unit is composed of an air core and anti-resonance quartz cladding tubes periodically arranged on the periphery, the cladding tubes form an anti-resonance transmission band gap with a specific wavelength through precisely designed wall thickness and spacing, and the air core serves as a main transmission channel; a water-cooling temperature control unit is integrated, the water-cooling temperature control unit comprises a spiral or snakelike micro-channel structure integrated in an outer cladding of the anti-resonance transmission unit, the outer cladding is made of a biocompatible high polymer material, a micro-channel and an optical fiber are axially arranged at a preset angle, and a forced convection heat dissipation path is formed by injecting a cooling medium. By optimizing the anti-resonance transmission unit and the water-cooling temperature control unit, stable laser transmission, efficient thermal management and reliability under long-time high-power laser operation are realized.

The application belongs to the field of optical fiber cables, and specifically discloses a production method of a hollow-core fiber hybrid cable, a product and equipment thereof, and the production method comprises the following steps: S1, connecting a pressure filling device to the exposed end of a hollow-core fiber wound on a fiber reel, keeping the pressure of the pressure filling device within a set pressure range until the air pressure in the hollow core of the hollow-core fiber is balanced, ending the pressure filling, and then plugging the exposed end of the hollow-core fiber to obtain a pressure-filled hollow-core fiber; and S2, placing the fiber reel of the pressure-filled hollow-core fiber on a wire rack with a heating and heat preservation function, and releasing the pressure-filled hollow-core fiber into an extruder to perform cabling. The application further provides the above hollow-core fiber hybrid cable production equipment. The method and equipment can solve the pollution problem of the air core of the hollow-core fiber hybrid cable and improve the production quality of the hollow-core fiber.

The utility model provides an electric freight vehicle with temperature adjusting equipment, the temperature adjusting equipment comprises a compressor, an evaporator and a condenser which are connected through a refrigerant pipeline, and also comprises a PTC (Positive Temperature Coefficient) device, a warm air core and a pump which are connected through a coolant pipeline, the compressor is a compressor with single refrigerating capacity of more than 10KW, and the evaporator is a single compressor with single refrigerating capacity of more than 10KW. The evaporators comprise the first evaporator and the second evaporator, the first evaporator is in straight-through connection with the compressor and the condenser, the second evaporator is connected with the compressor and the condenser through an electromagnetic valve, and the electromagnetic valve is arranged in the mode that refrigerants only pass through the first evaporator or simultaneously pass through the first evaporator and the second evaporator in a controlled mode. The first evaporator and the second evaporator are arranged in a cab of the electric freight vehicle. According to the electric freight vehicle provided by the utility model, the temperature can be quickly adjusted under the extreme temperature condition.

The invention provides a superconducting motor integrated thermal control system based on a special-shaped heat pipe and graphite foam, which comprises a special-shaped heat pipe assembly, a graphite foam heat expansion tile assembly and an air core stator, and is characterized in that the air core stator comprises a shell and an armature winding assembly, bionic fins are formed on the outer wall of the shell, and an enhancement layer is arranged on the inner wall of the shell; the graphite foam heat expansion tile assembly is embedded in the shell; the special-shaped heat pipe assembly comprises an evaporation end and a condensation end, the condensation end is embedded in the graphite foam heat expansion tile assembly, the evaporation end penetrates through the enhancement layer from the graphite foam heat expansion tile assembly and extends to the position between the two adjacent armature windings, and face-to-face contact is formed between the special-shaped heat pipe assembly and the armature winding assembly. The special-shaped heat pipe is in full contact with a heat generation hot spot of the armature winding, heat is quickly transferred to the graphite foam heat expansion tile through two-phase evaporative cooling, the graphite foam heat expansion tile expands heat in the circumferential direction, and efficient heat exchange is achieved by means of the low-resistance air flue and the bionic strengthening structure.

The utility model discloses an automatic angle bending device for a hollow coil, which belongs to the technical field of coil bending and comprises a frame, a support column, an adjusting mechanism and a pressing component, the support column is arranged on the top surface of the frame, the pressing component is arranged on the frame, the adjusting mechanism comprises an adjusting component and a driving component, and the driving component is arranged on the frame. The adjusting assembly comprises an adjusting plate, a first sliding block, an adjusting disc, a connecting column and a fixing column, the fixing column is fixedly connected to the rack, the adjusting disc is arranged at the end, away from the rack, of the fixing column, a first sliding groove is formed in the adjusting disc, the first sliding block is slidably connected to the first sliding groove, and the connecting column is arranged on the first sliding block. The adjusting plate is arranged at one end of the first sliding block, the connecting column is arranged at the other end of the first sliding block, and the distance between the adjusting plate and the adjusting disc can be automatically adjusted according to hollow coils of different sizes, so that the hollow coils cannot displace during bending operation.

A hollow-core photonic crystal fiber for sensing an oil includes a hexagonal core wall, a cladding region, and a circular layer. The hexagonal core wall defines a hollow space, where a core diameter is equal to a distance between two opposing inner vertices of the hexagonal core wall. The cladding region includes a circular cladding segment and up to four cladding arms, where the up to four cladding arms extend from the circular cladding segment to four outer vertices of the hexagonal core wall. An inner wall of the circular cladding segment, the up to four cladding arms and an outer surface of the hexagonal core wall define up to four wedge shaped air gaps. The cladding region has an inner radius with a range from 2.0 up to 2.4 times the core diameter and an outer radius with a range from 2.1 up to 2.6 times the core diameter.

The invention provides an exhaust sleeve and a processing device thereof, and relates to the field of tire molds, the exhaust sleeve comprises a sleeve and a gas core arranged in the sleeve, and the gas core comprises a mold body internal exhaust part, a mold body external exhaust channel and a mounting lead-in part. The air core is of an integrated structure. The diameter of the installation leading-in part is designed to be gradually reduced. A gap between the upper part of the gas core and the upper part of the sleeve forms a die body internal exhaust part; and gas in the die enters the gas core through the die body internal exhaust part and then is exhausted through a die body external exhaust channel. One end of the installation leading-in part is communicated with an air outlet of the die body external exhaust channel, an air inlet of the die body external exhaust channel is communicated with an air outlet of the upper core body part, and an air inlet of the upper core body part is communicated with the die body internal exhaust part. The novel structure is created, the working mode of a traditional exhaust sleeve is overturned, the problem of rubber hair of a common air sleeve is solved, the problem that a spring air sleeve is difficult to install and replace is solved, and the cost can be controlled within a low range due to the fact that the structure is easy to machine.

The application relates to a hollow core anti-resonant optical fiber, comprising an outer cladding, an anti-resonant region and a core region; the anti-resonant region comprises a plurality of nested units, the nested unit comprises a first anti-resonant tube and a second anti-resonant tube, the first anti-resonant tube is connected with the outer cladding, the second anti-resonant tube is connected with the first anti-resonant tube, the included angle theta between the first plane and the second plane of the nested unit is 0 DEG <= theta < 180 DEG, the first plane is a plane formed by the central axis of the first anti-resonant tube and the central axis of the second anti-resonant tube in the first anti-resonant tube, and the second plane is a plane formed by the central axis of the first anti-resonant tube and the central axis of the outer cladding; the core region comprises a region surrounded by the boundary between the first anti-resonant tube and the outer cladding. While realizing low loss, the application breaks the structural symmetry of the existing hollow core anti-resonant optical fiber, does not need to accurately control the fiber resonant ring joint position structure, reduces the preparation difficulty of the optical fiber, and is favorable for large-scale production of the optical fiber.

The invention discloses a multi-source heat management system of a new energy automobile. The new energy automobile multi-source heat management system comprises a refrigerant loop, the refrigerant loop comprises a compressor, the compressor is connected with a water condenser, the water condenser is connected with a first control valve and a second control valve which are connected in parallel, the first control valve is connected with an air conditioner evaporator, and the second control valve is connected with a battery cooler. The battery cooler and the air conditioner evaporator are connected in parallel and then connected with the compressor, the refrigerant loop is coupled with a warm air loop through a water condenser, the warm air loop comprises a warm air core body and an air conditioner low-temperature water tank which are connected in parallel, and the end, connected with the air conditioner low-temperature water tank in parallel, of the warm air core body is connected with the water condenser through a first three-way proportional water valve. The other end, connected with the air conditioner low-temperature water tank in parallel, of the warm air core is connected with a water condenser through an air conditioner water pump. The problem of low reliability in the prior art is solved.

The application provides a PCB air-core inductor, a design method thereof and a switching power supply, wherein the design method comprises the following steps: determining the winding turns, winding width and winding thickness of the PCB air-core inductor, and designing the number of winding layers in the PCB and the width and thickness of the winding metal in each winding layer according to the winding turns, winding width and winding thickness; sequentially connecting the winding metal in each winding layer in series to form a PCB winding, wherein the PCB winding is embedded in an insulating support body composed of insulating medium; forming a metal shielding body around the PCB winding, wherein the metal shielding body and the PCB winding are separated by insulating medium; and the metal shielding body comprises four circumferential shielding walls, one upper shielding wall and one lower shielding wall, and the beginning and end of the PCB winding are connected to the input terminal and the output terminal respectively and lead out through the corresponding circumferential shielding walls. The application solves the problems of poor magnetic shielding performance and large high-frequency loss of the PCB planar inductor in the prior art.

The invention provides an automobile heat pump air conditioning system which comprises a refrigerant loop and a cooling liquid loop, the refrigerant loop is formed by sequentially connecting a compressor, a water cooling condenser, an electronic expansion valve and a battery cooler in series to form a closed loop, and the cooling liquid loop is composed of a twelve-way water valve, an outdoor radiator, a warm air core body and a cold air core body. Two ends of the water-cooled condenser are respectively communicated with corresponding ports of the twelve-way water valve and then form a circulating branch through the outdoor radiator; the two ends of the battery cooler are connected with corresponding ports of the twelve-way water valve respectively, the cold air core body and the warm air core body are connected in series and then connected into the twelve-way water valve, flow paths are switched through the twelve-way water valve, and heat transfer and temperature adjustment under different working conditions are achieved. A single twelve-way water valve is adopted to replace a plurality of traditional valves, the number of the valves is reduced, pipeline connecting points are reduced, and the integration level of a waterway system reaches the industry leading level.

The invention discloses a submarine cable three-dimensional route detection system and method based on underwater intelligent aeromagnetism, and belongs to the technical field of crossing of ocean engineering detection and underwater robot control. According to the system, geomagnetic interference is reduced through a non-metal watertight compartment and double triaxial orthogonal coupling air core coils, the detection efficiency is synchronously improved by combining real-time data acquisition and control, three-dimensional routing and burial depth accurate measurement of submarine cables is realized through multi-dimensional data fusion, and through mechanical structure design, a high-frequency closed-loop control algorithm and a multi-source data fusion technology, the reliability of the system is improved. High-precision synchronous measurement of latitude and longitude coordinates and burial depth parameters of the submarine cable is achieved, the measurement precision reaches the centimeter level, and complete three-dimensional space information support is provided for risk assessment, fault location and intelligent operation and maintenance of the submarine cable.

The invention discloses a polarization-maintaining hollow-core anti-resonance optical fiber with an arc-shaped cladding. The polarization-maintaining hollow-core anti-resonance optical fiber comprises a fiber core region and a cladding region, the fiber core area is formed by surrounding of the cladding area and is in a long strip shape. The cladding area comprises a cladding tube, a half-tube structure and an outermost sleeve; the cladding tube comprises two nested circular tubes; the two nested circular pipes are tangent to each other, and the outer circular pipe is in contact with the outermost sleeve; the whole optical fiber structure meets central symmetry. The hollow-core anti-resonance optical fiber has the unique advantages of low loss, low nonlinearity, high temperature stability and the like, and optical signals can be well limited in the fiber core for transmission. The effective mode refractive index of the polarization state is modulated through the y-pol reverse cross coupling of the quartz wall of the half-tube structure to the fundamental mode, and meanwhile the fundamental mode of the air fiber core is effectively limited through the nested tube in the cladding area, so that the low-loss performance is considered while high birefringence is achieved. And support is provided for application in the fields of signal transmission, precision sensing, optical fiber gyroscopes and the like.