1764 results about "Closed cavity" patented technology

The invention discloses a medical developing marker and a manufacturing method thereof, and relates to the field of medical instruments, the medical developing marker comprises a closed tube, the outer wall of the closed tube is provided with a bionic barb structure, the bionic barb structure is distributed in a flexible zigzag convex manner, and the bionic barb structure and the closed tube are integrally formed through an injection molding process; a closed cavity is arranged in the closed tube, four developing strips are symmetrically arranged in the tube wall of the closed cavity, the tube wall of the region where the developing strips are located is etched to form a weak band, and a developing material layer and a sustained-release medicine layer are sequentially deposited at the weak band. The developing material layer and the sustained-release drug and / or marked nano-particle layer are alternately deposited to form a functional composite layer, and the functional composite layer can directionally rupture to release the therapeutic drug under the action of implantation pressure. The marker integrates the functions of precise development, tissue anchoring and drug sustained release, is adaptive to multi-mode imaging such as ultrasonic imaging, X-ray imaging, CT imaging, MRI imaging and PET-CT imaging, and has remarkable clinical value in precise positioning treatment of solid tumors such as breast cancer and liver cancer.

The disclosure provides smart swimming goggles, including a swimming goggle eyecup, a housing attached to the swimming goggle eyecup and internally provided with a closed cavity, and a near-eye display system arranged in the closed cavity of the housing; the near-eye display system includes a light source device, an optical assembly at least including a waveguide lens, a processor, and a wireless communication module; an area, right facing the waveguide lens, of the housing is a light-transmitting area; the optical assembly is configured to transmit projection light outputted by the light source device to a human eye through the waveguide lens; the processor is in communication connection with an external terminal device through the wireless communication module, so that information interaction between the processor and the external terminal device is facilitated; and the housing is further provided with a waterproof key-attached to the processor and configured to send a trigger instruction to the processor when pressed, so that the processor controls a working state of the light source device according to the trigger instruction. According to the smart swimming goggles in the disclosure, more swimming information data is able to be provided for a swimmer, the swimming interestingness is enhanced, and the personalized requirements of a user are met.

An article of footwear including an upper and a sole structure. The sole structure includes a midsole, wherein the midsole includes an enclosed cavity, a thermoformed cushioning element disposed within the enclosed cavity, wherein the cushioning element includes an upper barrier film and a bottom barrier film enclosing an internal volume, and an outsole layer, wherein the outsole layer forms a ground-engaging surface of the article of footwear.

The utility model relates to an armored temperature and pressure integrated sensor, and the sensor comprises an armored housing which comprises a housing body and a sleeve connected with the housing body, and the sleeve is internally provided with a closed cavity; the circuit board is arranged in the armored shell; the temperature sensing element is mounted in the closed cavity; the support is arranged in the armored shell and comprises a support body, a metal terminal is arranged in the support body, one end of the metal terminal extends into the armored shell to be connected with the temperature sensing element, and the other end of the metal terminal extends out of the support body to be connected with the circuit board; and the pressure sensing element is mounted in the bracket and connected with the circuit board, and the pressure sensing element is used for detecting the pressure of an external pressure source. While temperature and pressure are measured synchronously, the excellent performance of the armored shell effectively protects internal elements from external physical impact, electromagnetic interference, severe temperature fluctuation and the like, it is ensured that the sensor can work stably and reliably in a complex environment and a complex medium, and the measurement precision is ensured.

The invention discloses a method for identifying boundary features of a three-dimensional model of a closed cavity of an airplane, and provides a method for automatically and intelligently detecting the boundary features of the closed cavity in order to solve the problems that the extraction precision of the boundary features of the closed cavity is poor and the efficiency is low. Providing a minimum allowable gap recommendation mechanism based on a decision tree, and automatically extracting boundary part information; analyzing and screening an accurate boundary surface through a geometric distance and a normal vector included angle; and constructing a part attribute adjacency graph, and identifying the gap type of the closed cavity based on a GNN enhanced VF3 sub-graph isomorphism algorithm to realize automatic identification and marking of boundary parts and gaps of the closed cavity in the three-dimensional model. The method solves the problems of low manual detection efficiency and large error in a complex assembly environment, remarkably improves the precision and automation level of closed cavity boundary feature recognition, and is suitable for assembly area modeling scenes with few samples and high precision requirements in the field of aeronautical manufacturing.

The invention provides a pot support, and relates to the technical field of gas cooks.The pot support mainly comprises a ring body, and the outer edge of the ring body is higher than the inner edge of the ring body so that a combustion area can be defined; an upper cavity and a lower cavity which are stacked and independent are formed in the ring body; the lower cavity is a closed cavity; an air inlet hole and an air outlet hole which are communicated with the interior and exterior of the upper cavity are formed in the cavity wall of the upper cavity to form a channel for high-temperature gas to flow; the air inlet and the air outlet are arranged away from each other; the air outlets face the through hole in the bottom of the ring body. According to the embodiment provided by the invention, part of generated high-temperature gas is sucked into the upper cavity from the air inlet holes in the high position, the high-temperature gas flows along the upper cavity, heat of the high-temperature gas is conducted through the cavity wall, the temperature of the whole pot support is greatly increased, the heated pot support directly conducts efficient heat conduction heating on a pot, and the heating efficiency is improved. And the high-temperature gas finally flows downwards and flows out from the gas outlet hole, and flows upwards and is sucked into the upper cavity, so that heat circulation is formed, and the overall heat efficiency is remarkably improved.

The invention discloses a self-setting packer and a using method, and belongs to the technical field of packers.The self-setting packer comprises a base body unit, a setting unit and a control unit; the base body unit is sleeved with the setting unit and the control unit, and the control unit is located on one side of the setting unit. The control unit is connected with the setting unit; a negative pressure cavity is formed between the setting unit and the base body unit; a closed cavity is formed among the base body unit, the setting unit and the control unit. A dissoluble material is arranged in the control unit; and one end of the dissoluble material is communicated with the closed cavity. According to the self-setting packer disclosed by the invention, the rubber sleeve is compressed by virtue of hydrostatic pressure of a shaft, so that an oil sleeve annulus is sealed, two-way pressure can be borne, and meanwhile, the packer can be unsealed; the device has the advantages of simple structure, no need of manual control, no need of external power, self-setting and the like.

The invention belongs to the technical field of fire fighting, and particularly relates to an intelligent fire extinguishing device for fire disasters, which comprises a valve body, a valve plate for sealing a connecting port is connected in the valve body in an up-down sliding manner, a valve rod in threaded connection with the valve body is arranged on the valve plate, and a sealing plate is arranged on the valve rod at the upper end of the valve plate. The supporting block is provided with a drainage hole for water to flow back, after water flow is cut off, a cavity is formed between the closing plate and the valve plate, the water flow in the closed cavity can be recycled, and then residual water in the closed valve body is continuously gathered at the closing plate, can be gathered into the drainage hole and is collected and recycled into the cavity through the drainage hole. Meanwhile, uniform recovery is conducted, drainage and convergence of water flow on the closing plate are accelerated through driving of the adjusting assembly, and therefore residual water is little, the retention time is short, the corrosion and rust degree is reduced, and the service life is prolonged.

The invention relates to a laser radar and a vehicle. The first shell and the second shell of the laser radar can form a closed cavity in a surrounding mode, and the laser radar internal module is located in the cavity. The window area of the first housing is used for transmitting laser or receiving laser of the laser radar. The first shell of the laser radar is the continuous curved surface, and the included angle between the tangent plane of any point of the window area and the horizontal plane is smaller than 45 degrees, so that the laser radar has a smooth appearance line, the appearance of a vehicle cannot be obviously highlighted when the laser radar is installed on the vehicle, the laser radar can be better fused with the appearance of the vehicle, and the appearance aesthetic feeling of the vehicle is improved; and the wind resistance of the vehicle is reduced.

The invention discloses a self-adaptive fitting ultrasonic probe flexible accessory which comprises a flexible cover sleeve body, and the flexible cover sleeve body is made of a medical-grade elastic material and is provided with a containing cavity matched with an ultrasonic probe in shape; the sealing opening is formed in the bottom of the flexible cover sleeve body and is used for tightly wrapping the emitting surface of the probe; the liquid storage cavity is a closed cavity and is pre-filled with a high-viscosity medical ultrasonic coupling agent; the self-adaptive attaching layer is composed of the bottom wall of the flexible cover sleeve body. Wherein the liquid storage cavity is located between the sealed opening and the self-adaptive attaching layer, and the coupling agent is evenly distributed on the contact interface of the probe and the skin under the action of pressure; the probe is matched with a common ultrasonic probe, and the imaging effect of the probe in an uneven body surface area is improved on the premise that the main body structure of the probe is not changed.

The invention discloses an efficient thermal recovery packer, and relates to the technical field of oil field downhole tools. The upper cooler and the lower cooler are both of a heat pipe structure, the upper cooler and the lower cooler are both of a closed cavity structure, capillary objects are bonded to the inner wall of a cavity, the cavity is filled with working fluid, and air pressure in the cavity is in a negative pressure state. The device has the beneficial effects that the outer circle of the lower cooling disc expands when the lower cooling disc is heated, the outer circle of the lower cooling disc is elastically attached to the inner wall of the sleeve, steam can be directly blocked on the lower side of the rubber barrel, meanwhile, the lower cooling disc makes direct contact with the sleeve and can exchange heat with the sleeve below the rubber barrel, and the temperature of the sleeve making contact with the rubber barrel is reduced; the temperature of the rubber sleeve is further reduced, the sealing performance of the rubber sleeve is improved, the service life of the rubber sleeve is prolonged, an annular groove in the outer circle of the lower cooling disc enables an annular space to be formed between the lower cooling disc and the sleeve, and heat insulation and elastic connection are facilitated.

The invention relates to the technical field of hydraulic valves, and discloses a buffer overflow valve which comprises a shell, a first sealing ring is arranged on the surface of the shell, a connecting block is fixedly connected to the right end of the shell, an adjusting assembly is arranged in the connecting block, and a storage assembly is fixedly connected to the side, close to the shell, of the adjusting assembly. A moving assembly is arranged in the storage assembly, a spring is arranged between the storage assembly and the moving assembly, the adjusting assembly comprises a threaded rod, the surface of the threaded rod is in threaded connection with a connecting block, and the surface of the threaded rod is in threaded connection with a locking nut. A closed cavity is formed between a connecting column and a fixing seat, a second sealing ring is used for sealing, a valve element and an oil way in the connecting column are communicated with the closed cavity, the cavity is filled with oil, and when the oil on the left side of the valve element rises, due to the existence of the oil in the closed cavity, the valve element cannot instantly leave a valve seat at the bottom of a valve block; therefore, the buffer overflow valve can be opened at low pressure, and pressure impact cannot be generated.

Disclosed is a spherical roller bearing comprising: at least an outer ring and an inner ring; two groups of spherical rollers; and at least one cage configured to retain the spherical rollers, the cage comprising at least one axially inner cage ring, a first axially outer cage ring and a second axially outer cage ring extending in a circumferential direction of the spherical roller bearing, the first axial outer retainer ring and the second axial outer retainer ring are respectively separated from the axial inner retainer ring and are connected to the axial inner retainer ring through a plurality of retainer rods to form a closed cavity; each pocket is configured to receive one spherical roller and has an axially inner pocket side face and an axially outer pocket side face configured to restrain the spherical roller in the axial direction, each cage bar has a curved portion extending in the axial direction in the circumferential direction, the curved portion is at least partially concave, and in the axial direction, the curved portion is at least partially concave. The distance between the vertex of the bending part and the side face of the axial inner cavity lattice is different from the distance between the vertex of the bending part and the side face of the axial outer cavity lattice.

The three-dimensional shaping cloth flattening device comprises a base, a top plate and a lifting plate, a constant-pressure flattening head is arranged on the bottom face of the lifting plate, the constant-pressure flattening head comprises a constant-pressure air chamber shell, a flexible pressurizing bag and a constant-pressure mechanism, and the flexible pressurizing bag and the constant-pressure air chamber shell are connected in a sealed mode to jointly form a closed cavity; the constant-pressure mechanism is mounted in the constant-pressure air chamber shell and is used for providing constant reference pressure for the flexible pressurizing bag; a driving mechanism is fixedly arranged on the upper surface of the top plate and used for driving the constant-pressure leveling head to move relatively. According to the three-dimensional cloth flattening device, the problem that three-dimensional cloth is not completely flattened or damaged due to uneven pressure can be solved, and the high-quality and lossless three-dimensional flattening effect is achieved.

The invention provides a display unit and display equipment. The display unit includes: a first substrate; the second substrate is arranged opposite to the first substrate; the pixel wall is arranged between the first substrate and the second substrate, and a closed cavity is defined by the pixel wall, the first substrate and the second substrate; the light control board comprises at least two blades, and the at least two blades are rotationally connected into the closed cavity; a reflecting layer or a light absorbing layer with a preset color is arranged on the surface of each blade; two of the at least two blades have opposite electrical properties or opposite magnetic properties; and the driving electrodes are at least arranged on two of the first substrate, the second substrate and the pixel wall along the rotating direction of the blade, and are used for driving the light control plate to rotate to a corresponding angle position so as to display corresponding brightness. According to the display unit, the problems that black spots appear when electrowetting displays white, ink is split during shrinkage and microcapsules are coagulated can be solved, and the response rate is increased.

The invention provides a scroll compressor cross ring dynamic strain wireless measuring device, which relates to the technical field of compressor state monitoring and comprises a high-temperature-resistant strain gauge, a wire fixing system and a wireless sensor. Wherein the high-temperature-resistant strain gauges are respectively attached to stress sensitive areas of a static key, a ring beam and a movable key of the cross ring every time; the wire fixing system comprises a three-stage fixing structure formed by an adhesive, an internal wire, an external wire and an internal binding post; the three stages of fixing structures are a strain gauge end fixing structure, a lead transition section fixing structure and a binding post end fixing structure in sequence; the high-temperature-resistant strain gauge is connected with the wireless sensor through an internal wire, a binding post and an external wire, and continuous signal collection is achieved. By implementing operation according to the technical route, the impact load borne by the cross ring at the moment of starting and stopping of the compressor can be collected in a high-quality mode, data collection in a closed cavity is achieved, and an experimental basis is provided for subsequent strength design of the cross ring.

The invention relates to the technical field of thermoelectric magnetic field numerical simulation, in particular to a numerical simulation method for liquid metal flow heat transfer under thermal electromagnetic multi-field coupling. The method comprises the following steps: acquiring metal structure physical parameters and thermal electromagnetic multi-field coupling simulation control parameters of metal to be tested; based on the metal structure physical parameters and the thermal electromagnetic multi-field coupling simulation control parameters, liquid metal thermal electromagnetic multi-field reaction numerical simulation and verification are carried out, and liquid metal thermal electromagnetic multi-field reaction verification data are generated; setting single-factor working condition simulation control parameters; and carrying out working condition simulation liquid metal flow heat transfer global characteristic analysis on the liquid metal thermoelectromagnetic multi-field reaction verification data based on the single-factor working condition simulation control parameters so as to establish a liquid metal thermoelectromagnetic flow heat transfer global characteristic model. According to the invention, comprehensive and accurate analysis of flowing and heat transfer of the liquid metal in the closed cavity under the thermal electromagnetic coupling effect by various factors is realized.

The utility model discloses a double-suction double-discharge reciprocating injection pump which comprises a pump body, a liquid inlet pipe and a liquid outlet pipe, two pistons are arranged in an inner cavity of the pump body at intervals in the length direction, the two pistons are movably assembled with the inner cavity of the pump body in a sealing mode, and the inner cavity of the pump body is divided into a first closed cavity, a sterilization air cavity and a second closed cavity by the pistons, a linkage rod located in the sterilization air cavity is arranged between the two pistons; one end of the pump body is provided with a first interface and a second interface which are respectively communicated with the first closed cavity, the other end of the pump body is provided with a third interface and a fourth interface which are respectively communicated with the second closed cavity, the first interface and the third interface are both communicated with the liquid inlet pipe, and the second interface and the fourth interface are both communicated with the liquid outlet pipe; one-way valves are arranged in the first connector, the second connector, the third connector and the fourth connector respectively. The liquid balance device can solve the problem of liquid balance of continuous blood purification equipment in a vibration impact environment of a moving occasion, simplifies the principle, and improves the reliability.

A vessel for transporting a living organ includes a container having an open top end and a closed bottom end, and a lid configured to selectively cover the open top end of the container and seal an inner chamber. The container includes a rigid outer housing, a rigid inner housing positioned within the rigid outer housing, and an insulating layer. The rigid inner housing defines the inner chamber, which is configured to hold a living organ. The rigid inner housing and the rigid outer housing define a closed cavity therebetween, in which the insulating layer is positioned.

A highly sealed invasive biosensing assembly and a biological information monitoring apparatus. The present invention relates to the technical field of biosensors. The highly sealed invasive biosensing assembly comprises a biosensor, and an electrode-protecting cover is snap-fitted to the lower part of the biosensor. A guide needle is snap-fitted into the biosensor, longitudinally penetrating the biosensor. The biosensor further comprises a sensing electrode and an electrode pressure plate. In a first state, the electrode pressure plate, the lower part of a needle guide seat, and the interior of the electrode-protecting cover form a first closed cavity. In a second state, the electrode-protecting cover is detached from the biosensor, so that at least part of the sensing electrode entering the first closed cavity and at least part of a needle body extend out of the first closed cavity. The invasive biosensing assembly and the biological information monitoring apparatus form a closed space inside the assembly and the apparatus by means of a snap structure and the positional relationship between components during assembly, thereby improving the hermeticity in the assembly and the apparatus, so that the assembly is in a sterile state before being implanted into a human body.

The invention discloses split type miniature signal transmission equipment, which comprises processing equipment, a cable and a detection probe, and is characterized in that the cable is connected in series with at least one connecting mechanism, so that the cable can be extended or connected with the probe; the connecting mechanism comprises a connecting shell, a conductive plugging assembly is arranged in the connecting shell, one end of the connecting shell is provided with a mechanical connecting part, the mechanical connecting part comprises jacks and connecting pieces which are alternately arranged, and the connecting pieces can be locked through locking assemblies; after the connecting piece is inserted into the jack, a closed cavity is formed at the bottom of the jack, and the cable connection stability is improved through a dual anti-loosening mechanism of negative pressure adsorption and mechanical locking; the connecting shell is further provided with a miniature one-way valve, a decompression assembly, a wire protecting sleeve, a sealing gasket and other structures, the conductive plugging assembly comprises a plug and a socket assembly, the pin unit adopts a double-pin design, and through a rigid connection mode and an elastic connection mode, the stability of conductive plugging is ensured, the situation that detection is affected by too long or insufficient cables can be avoided, and the detection efficiency is improved.

The invention relates to the technical field of image equipment, and discloses a control method and system for a refrigeration module of a closed cavity, and the method comprises the steps: obtaining the temperature of the refrigeration module, the error of refrigeration module temperature detection equipment, the temperature of a heating end, the temperature of the cavity and the humidity of the cavity in real time; determining a target temperature interval according to the cavity temperature, the cavity humidity, the refrigeration module temperature detection equipment error, the heating end temperature and the cavity temperature; and the working state of the refrigeration module is adjusted according to the refrigeration module temperature and the target temperature interval. By adopting the method and system provided by the invention, the temperature of the refrigeration module can be effectively controlled, the internal temperature of the closed cavity is reduced, the heat emitted by the heating end of the device is released, the condensation phenomenon on the refrigeration module is prevented, and the service life of equipment is prolonged; meanwhile, the working state of the refrigeration module is adjusted by taking the target temperature interval instead of a single temperature point as a reference, and the situation that the service life of the refrigeration module is shortened due to frequent switching on and off of the refrigeration module is avoided.

A cooling apparatus for an electric machine includes a body, a plurality of channels defined in the body, and a manifold. The body extends from a first end to a second end and defines an outer surface, an inner surface, and a cavity interior of the inner surface. The cavity is configured to receive electric machine windings of the electric machine. The plurality of channels extend from the first end to the second end. Each of the plurality of channels is disposed between the inner surface and the outer surface. The manifold defines a fluid port and is arranged to engage the body at one of the first end or the second end to form a fluidtight chamber enclosing the plurality of channels from the cavity. The fluidtight chamber is in fluid communication with the fluid port.

In some embodiments, a pressure sensor may comprise a housing, a flexible membrane which, together with the housing, forms a hermetically closed cavity, a sensor element arranged in the hermetically closed cavity, and a gaseous medium in the hermetically closed cavity. The sensor may detect a change in a physical property, of the flexible membrane, associated with an external pressure pressing inward into the flexible membrane of the hermetically closed cavity.

A fishing tool (1) for performing a fishing operation to recover an object (2) in a subterranean well (3), comprising: an outer shell segment (100); an inner shell segment (200); wherein the tool (1) is configured to be moveable between: a scooping configuration wherein the outer shell segment (100) and the inner shell segment (200) are at least partially overlapping and form an open chamber (1200B) for receiving the object (2) into in use; and a closed configuration wherein the outer (100) and inner (200) shell segments form a closed chamber (1200A) for trapping the object (2) therein in use; wherein the tool (1) is configured to scoop the object (2) into the open chamber (1200B) in use by rotation of the outer (100) and / or inner (200) shell segments; and wherein the tool (1) is configured to move between the scooping configuration and the closed configuration by relative rotation of the outer (100) and inner (200) shell segments.

The invention discloses an embedded injection mold, and relates to the technical field of mold injection, the embedded injection mold comprises an upper mold set, a lower mold set is mounted below the upper mold set, an embedded auxiliary mechanism is arranged below the lower mold set, and the embedded auxiliary mechanism comprises an upper moving plate and an upper assembly pipeline which are symmetrically distributed below an insert main body; the lower portion of the upper assembling pipeline is communicated with a lower assembling pipeline, a lower moving plate is installed in the lower assembling pipeline, the upper moving plate and the upper assembling pipeline form a closed cavity in the downward moving process, generated negative pressure is transmitted to the insert through the hole discharging piece, and a multi-layer round hole pipe of the hole discharging piece is matched with the outline of the irregular insert according to the height difference. Compared with the prior art, the positioning pin has the advantages that the positioning pin is firstly adsorbed from the edge and then transited to the center, deformation of the insert caused by single-point stress is avoided, meanwhile, direct friction between a positioning part and the insert is reduced through non-contact adsorption, the problem of abrasion of a traditional positioning pin is avoided, frequent maintenance and replacement are not needed, long-term positioning accuracy is guaranteed, and production interruption time is shortened.

The application discloses a sample refrigeration storage device and a sample pipeline analysis system. The sample refrigeration storage device comprises a refrigeration storage area, a refrigeration storage area frame, a refrigeration placing rack and a first refrigeration mechanism; a refrigeration operation area, an operation area frame, a sample sorting mechanism, a sample rack loading mechanism and a second refrigeration mechanism, the operation area frame is communicated with the storage area frame to form a closed cavity, the sample sorting mechanism and the sample rack loading mechanism can cooperate to load out the sample to be loaded out on the refrigeration placing rack through an entrance and exit, and load the sample to be loaded in into the refrigeration placing rack through the entrance and exit; a sample transmission track; and a central control system. Since the sample sorting mechanism is located in the refrigeration operation area, when the sample is retained, the second refrigeration mechanism makes the sample in a low-temperature environment, reduces the corruption and invalidation of the sample, reduces the sample collection frequency, and improves the sample detection efficiency.

The utility model provides a building water supply and drainage pipeline leakproofness detection device, which belongs to the technical field of pipeline installation, and comprises a sliding assembly, two groups of sealing assemblies, a detection assembly and an inflation device, the upper end of the sliding assembly is used for being connected with hoisting equipment, and the lower end of the sliding assembly is provided with a slideway; the two sealing assemblies are suitable for blocking openings in the two ends of a to-be-detected pipeline. The upper end of the detection assembly is slidably connected with the slideway, the lower end of the detection assembly is suitable for clinging to the outer wall of the pipeline and forming a closed cavity with the outer wall of the pipeline, the gas pressure in the closed cavity is detected to detect the leakage area of the pipeline, and the gas filling device is provided with a gas filling pipe which penetrates through at least one sealing assembly and is suitable for filling gas into the pipeline. The building water supply and drainage pipeline airtightness detection device provided by the utility model has the technical effects that the airtightness of pipelines at different positions can be detected, pipelines with different lengths can be detected, pipeline leakage areas can be detected, and the detection efficiency is high.

The invention discloses a vehicle-mounted microwave oven smell and VOC release detection and evaluation method and system based on vehicle-mounted high-temperature closed environment simulation. The method comprises the steps that a microwave oven to be detected is placed in a closed test cavity and sealed; the cavity is placed in a heating device to be heated to the preset high temperature and kept for the set time; the VOC sensor is used for monitoring the VOC concentration in the cavity in real time; collecting a gas sample through the sampling interface at the last test stage; performing standard sensory evaluation on the sample by an evaluator; carrying out comprehensive grade evaluation by combining the VOC concentration data and the smell grade score; according to the invention, the special closed cavity is arranged in the oven with accurate temperature control, high-temperature stress is directly and uniformly applied, and the released VOCs are ensured to be gathered in a limited space by utilizing the sealing property of the cavity, so that the VOCs are released in an accelerated manner under the most sensitive temperature and humidity condition of the material of the microwave oven to be detected, and the detection accuracy of the microwave oven to be detected is improved. The obtained release level and odor characteristics are highly related to the experience of the user in the actual vehicle-mounted scene.

The utility model provides an electrical cabinet heat radiation structure and an electrical cabinet, which belong to the technical field of electrical equipment and comprise a cabinet body, a heat exchanger, a first fan and a second fan. The cabinet body is provided with a closed cavity; the heat exchanger is arranged at the upper half part of the rear side plate of the cabinet body; the heat exchanger is provided with an internal circulation air outlet and an internal circulation air return port, the internal circulation air outlet and the internal circulation air return port both face the front side plate of the cabinet body, and the internal circulation air outlet is located below the internal circulation air return port; the first fan is arranged at the front lower part of the internal circulation air outlet, and the air outlet end faces the lower side plate of the cabinet body; the second fan is arranged at the front lower corner point of the closed cavity, and the air inlet end faces the rear side plate of the cabinet body. According to the utility model, the first fan is matched with the second fan, so that cold air output by the heat exchanger can circularly flow in the closed cavity, an airflow flowing path is enlarged, and the heat of an area far away from the heat exchanger in the closed cavity can be dissipated, so that the problem of local hot spots is avoided, and the overall heat dissipation effect of the electrical cabinet is improved.