173 results about "Labyrinth structure" patented technology

An ignition device includes an igniter that accommodates an ignition charge to be ignited by energization, and a holder that includes an insertion port for inserting the igniter, and is integrated with the igniter by fitting the igniter from the insertion port and press-fitting a tube body into a press-fitting portion. An end portion of the tube body is fitted into an annular groove formed in a bore, and a labyrinth structure is formed by an inner wall portion, an end surface portion, and an outer wall portion of the end portion, and the annular groove.

The utility model discloses a labyrinth type scrap steel packing block structure and a manufacturing die, and relates to the technical field of scrap steel packing blocks and scrap steel smelting. The labyrinth type waste steel packing block structure comprises a waste steel packing block with holes, through holes are formed in the waste steel packing block with the holes, a closed cavity used for being filled with fuel is formed in the waste steel packing block with the holes, and the through holes are communicated with the closed cavity through a labyrinth structure. And the labyrinth structure is used for introducing molten steel in the through hole into the closed cavity in the steelmaking process of the steel scrap packaging block with the hole. According to the labyrinth type waste steel packing block structure and the manufacturing method, on the basis of a waste steel packing block with holes and a closed cavity, the time for molten steel to enter the closed cavity can be accelerated and controlled in the mode that the labyrinth structure is additionally arranged between the holes and the closed cavity, and then the smelting efficiency of the waste steel packing block with the holes in waste steel smelting is improved.

The utility model relates to a vehicle-mounted integrated electromagnetic shielding case, and belongs to the technical field of communication and filtering. According to the utility model, the EMI power supply filtering unit is integrated, the electromagnetic interference between the case and the outside through a power line is effectively isolated, the design of the sub-cabin section structure and the labyrinth structure is adopted, the integrated electromagnetic shielding effect of the working cabin section of the case is ensured, the working cabin section is effectively isolated from the heat dissipation cabin section, and daily disassembly and maintenance of the case are facilitated; the integrated electromagnetic shielding effect of the case is considered, meanwhile, a low-thermal-resistance heat dissipation path is designed, and a reasonable heat dissipation airflow channel design is matched, so that heat generated by high-power-consumption components on the board card assembly is quickly dissipated into the environment through the case body, and normal operation of an electronic system in the case is guaranteed.

A contact arc extinguishing system of a switch belongs to the technical field of switches. Comprising a moving contact, a static contact and an arc extinguish chamber, the moving contact comprises a short contact piece and a long contact piece, grid pieces are arranged in the arc extinguish chamber in an array mode, the arc extinguish chamber is provided with an arc channel, the arc extinguish chamber is characterized by further comprising a labyrinth structure, the long contact piece is provided with a zigzag part, the zigzag part is coupled with the labyrinth structure, and a first moving contact of the short contact piece is located below the labyrinth structure. The second movable contact of the long contact piece is located above the labyrinth structure, and the labyrinth structure limits the arc gas above the labyrinth structure from being sprayed back to the lower portion of the labyrinth structure. The moving contact has the advantages that the arc gas has larger upward moving airflow, the upward movement of the arc is facilitated, and the effect can be ensured to be continuous all the time in the whole opening process of the moving contact; arc gas is prevented from impacting the moving contact, and lower breakdown is effectively prevented.

The utility model provides a smoke alarm with a replaceable maze, which comprises a shell, the shell is provided with a face shell and a bottom shell, the face shell is provided with an installation cavity, the maze is detachably arranged in the installation cavity, and a fixing plate for limiting and fixing the maze in the installation cavity is rotatably and detachably arranged on the face shell. The upper surface of the face shell is provided with at least one buckle protruding upwards, the fixing plate is provided with a clamping groove matched with the buckle, and the fixing plate is sleeved with the buckle in an aligned mode through the clamping groove and then horizontally rotates to form a clamping position so as to be fixedly connected with the face shell. The face shell is provided with an installation cavity structure matched with the maze structure, the maze can be stably installed in the alarm and can be conveniently disassembled by being matched with a fixing plate which is rotationally disassembled and assembled, the maze can be rapidly replaced without disassembling when the maze is maintained, time is saved, and when the maze is polluted and the alarm cannot be used in the using process of a client, the maze can be replaced conveniently. The maze does not need to be returned and repaired, the maze can be automatically replaced, and time and unnecessary cost are saved.

The utility model provides a vehicle speed reducer and an automobile, the vehicle speed reducer comprises a speed reducer shell and a speed reducer body, one side of the speed reducer shell is sunken to form a labyrinth structure, the labyrinth structure is provided with an oil gas cavity, a ventilation channel and an overflow channel, and the ventilation channel and the overflow channel both communicate with the oil gas cavity; the vehicle speed reducer further comprises a labyrinth cover piece and a ventilation valve assembly, the labyrinth cover piece is arranged on the labyrinth structure in a covering mode, the labyrinth cover piece is provided with an air inlet channel, and the ventilation valve assembly is installed on the ventilation channel. A mixture of oil and gas in the speed reducer shell flows into the oil gas cavity through the gas inlet channel, the oil flows back into the containing cavity from the overflow channel, and the gas is discharged from the ventilation valve assembly. According to the vehicle speed reducer, the ventilation valve assembly and the labyrinth structure are integrated on the speed reducer shell, and the air tightness, the dustproof and waterproof performance and the compactness of the whole structure of the speed reducer are improved.

To provide a suction screw type pump capable of preventing or suppressing a problem that foreign matters come around a back surface of a suction screw and is accumulated thereon even when the foreign matters come around the back surface of the suction screw by a mechanism other than catching of the foreign matters on a distal end of a screw operation part.SOLUTION: A suction screw type pump 10 includes a suction screw 20 provided on a distal end of a shaft 12 and integrally rotating with the shaft 12, a casing 40 storing the suction screw 20 therein and provided with a suction port 46 at the center on the front side in an axial direction of the shaft 12 and a discharge port 47 on the side, and a shaft sealing part 15 provided on a back surface of the casing 40 and shaft sealing around the shaft 12. A labyrinth structure 80 for obstructing movement of a foreign matter E which comes around a back surface 38 of the suction screw 20 to a radial inner side is provided in a portion in which the back surface 38 of the suction screw 20 and an inner surface of the casing 40 face each other in the axial direction.SELECTED DRAWING: Figure 1

The low-deflection mechanical seal for the horizontal kettle comprises a connecting flange, a corrugated pipe, a sealing box and a bearing seat which are sequentially arranged from a medium end to an atmosphere end, the corrugated pipe is connected between the sealing box and the connecting flange in a pressing mode, isolation gas is filled in the corrugated pipe, flammable and explosive gas can be prevented from flowing into the sealing box, and the sealing box is prevented from being damaged. The cleanness of the whole sealing device is ensured. A labyrinth structure is designed on the side, close to a medium, of the buffering cavity, and solid impurities generated by equipment are prevented from flowing into the buffering cavity and the mechanical seal. The static mechanical seal design is adopted for the medium end, the medium end spring is connected into the sealing box, and it can be guaranteed that the mechanical seal can still be used under the high deflection condition to the maximum extent. According to the mechanical seal for the horizontal kettle, the bearing is connected with the shaft sleeve, and axial force and radial force generated in the working process are concentrated on the bearing and then buffered by the corrugated pipe. The mechanical sealing device is high in sealing capacity, long in service life and suitable for occasions with deviation of mechanical sealing.

The utility model relates to the field of elevator cars, in particular to a high-strength mute high-speed fire elevator car which comprises a lintel assembly, first middle car wall plates are symmetrically arranged at the two ends of the lintel assembly, the outer edges of the two sides of each first middle car wall plate are provided with extending bent edges outwards, and first side car wall plates are symmetrically arranged on the two sides of each first middle car wall plate. An inward bent edge is arranged on one side of the first side car wall plate, an outward bent edge is arranged on the other side of the first side car wall plate, and the outwards-extending bent edge of the first middle car wall plate and the inward bent edge of the first side car wall plate form a labyrinth type structure. The outward bent edge of the first side car wall plate on one side of the first middle car wall plate and the inward bent edges at the two ends of the lintel assembly can be spliced to form a labyrinth structure, smoke dust is prevented from entering from the splicing position of the elevator car, and the problem that the splicing position of the elevator car is poor in air tightness is solved.

The utility model belongs to the technical field of explosion-proof pressure release valves, and relates to an explosion-proof pressure release valve with a sediment-proof structure, which comprises a valve cover, a stainless iron sheet, a pressing ring, a breathable film, a pressing sheet, an inner O-shaped ring, a valve body, an outer sealing ring, a spring and a guide post, the valve cover is designed to be of the flanging structure, the ventilation channel is formed in the side face of the anti-explosion valve, and silt and mud cannot be injected into the anti-explosion valve from the front face; a ventilation gap between the valve cover and the valve body is designed to be smaller than the particle size of silt and mud particles, and silt and mud are blocked outside the anti-explosion valve; according to the explosion-proof valve, the valve cover turnup is adopted, the retaining wall is arranged between the valve cover and the valve body, the retaining wall is higher than the gap of the ventilation channel and forms a labyrinth structure, when water is injected into the explosion-proof valve, the water is blocked by the retaining wall and cannot be directly injected into the explosion-proof valve, the effect of IPX9K is achieved, the ventilation film is protected against damage, and the sealing integrity of the explosion-proof valve during high-pressure water injection is guaranteed; and the upper groove of the valve body is trapezoidal to prevent the inner O-shaped ring from being separated, so that the problem that the O-shaped ring pops up when an existing anti-explosion valve works is solved.

The present invention discloses a highly sealed sealing component, mainly including a skeleton A, etc. The outer ring is assembled with the inner ring through steel balls held by a cage, and a raceway is formed between the outer ring and the inner ring. The inner side of the mouth of the outer ring is connected to the skeleton A, the outer side of the inner ring is connected to the skeleton C, and the outer side of the skeleton C is connected to the skeleton B by interference fit. The skeleton A, the skeleton B, and the skeleton C are nested and matched with each other. The skeleton B is wrapped with magnetic rubber, and the magnetic rubber contacts the skeleton C. The outer package of the skeleton A is rubber, and the outer package rubber is provided with protrusions for interference fit with the outer ring. The outer package rubber is provided with a lip A, a lip B, and a lip C. On the premise of ensuring magnetic signal output and sealing performance, the present invention adopts a design with fewer lips with only 2 contact lips, which can effectively reduce the frictional torque; through the design of a new labyrinth structure, a labyrinth effect is generated, thereby increasing the difficulty of muddy water intrusion, reducing the risk of grease pollution and grease overflow caused by muddy water intrusion into the raceway, and improving the sealing performance.

The invention relates to the technical field of power batteries, and discloses a fire-retardant protection assembly and power equipment, and the fire-retardant protection assembly comprises a valve body which is internally provided with a cavity and comprises an air inlet opening and an air outlet opening which communicate the cavity with the outside; the air inlet is located on one side close to the bottom of the valve body, and the air outlet is located on one side close to the top of the valve body. The air inlet opening is formed in the side face of the valve body. An impeller is arranged at the bottom of the cavity of the valve body; a gap is formed between the peripheral side of the impeller and the valve body; the air inlet opening is opposite to the peripheral side of the impeller, and air entering from the air inlet opening can drive the impeller to rotate; the labyrinth structure is arranged in the cavity, is positioned on one side close to the top of the impeller, and comprises a labyrinth inlet and a labyrinth outlet which are communicated with each other; the air inlet opening is communicated with the labyrinth inlet; the direction from the labyrinth inlet to the labyrinth outlet is arranged along the width direction of the valve body; the filter screen assembly is arranged in the cavity and located between the labyrinth type structure and the air outlet opening. The fire-retardant protection assembly can achieve the fire-retardant and smoke-retardant effects.

Machine learning algorithms are used to analyse data obtained from detectors 120 e.g. fire, smoke or carbon monoxide detectors in fire protection systems. A time at which maintenance is required for one or more of the detectors is predicted based on identified trends. This time may be a present time (i.e. maintenance of a detector is required immediately) or a future time (i.e. maintenance of a detector is going to be required). The data may be grouped into clusters and the time at which maintenance is required may be based on comparing a rate of change to a threshold. The rate of change may be the rate of change of a distance from a centroid of the cluster. The machine learning algorithms may be one or more of a support vector machine, k-nearest neighbours or an autoencoder. The method ensures that the fire detection system receives timely maintenance, thereby maximizing system uptime and reliability. The detectors may be a smoke detectors with a labyrinth structure where increase in dust can lead to an increased level of obscuration.

Provided is a labyrinth heat insulation structure, the heat insulation structure is used for a labyrinth structure, the labyrinth structure comprises a rotor side labyrinth and a stator side labyrinth, the stator side labyrinth further comprises a connecting arm, and the structure comprises a heat insulation cover arranged on the surface of the connecting arm. According to the labyrinth heat insulation structure, the heat insulation cover is installed on the stator side of the labyrinth, the heat insulation cover is attached to the elongated thin-wall face of the stator, heat convection on the surface of the labyrinth on the stator side is weakened, the thermal response of the labyrinth on the stator side can be effectively slowed down, and therefore the labyrinth on the rotor side and the labyrinth on the stator side are matched and coordinated, and the thermal response is consistent. The invention further provides an aero-engine.

A beverage preparation capsule (1) comprising a cup-shaped body (6) and a lid (7) to fluid-tightly seal the cup-shaped body (6) and intended to be perforated to allow a fluid to be injected into the capsule (1); the cup-shaped body (6) comprises, at a bottom portion thereof, a beverage outlet (8) and a labyrinth structure (9) surrounding the beverage outlet (8). The beverage preparation capsule (1) further comprises a film (11) fixed to an annular relief (14) of the cup-shaped body (6) to cover the beverage outlet (8) and the labyrinth structure (9), and a film supporting structure (15) arranged between the annular relief (14) and the labyrinth structure (9), and comprising a plurality of ribs (12) mutually spaced apart to define intermediate gaps (16) distributed around the labyrinth structure (9) and projecting upwards beyond the labyrinth structure (9); the film (11) is arranged to extend above, and spaced apart from, the labyrinth structure (9) and to be torn at the ribs (12) under the effect of the increase in the fluid pressure inside the capsule (1).

The invention discloses an adjustable folding structure unit and a tunable acoustic coding metasurface in the technical field of acoustic metamaterials, and the adjustable folding structure unit adopts a labyrinth structure and comprises a sound wave inlet, a sound wave outlet and a labyrinth channel formed by at least eight transverse plates. Sound waves enter the labyrinth channel from the sound wave inlet and then propagate to the sound wave outlet along a preset path; the tunable acoustic coding metasurface comprises a plurality of adjustable folding structure units arranged according to a coding sequence, the acoustic wave phase difference reaches pi by adjusting the length of at least one movable transverse plate in the labyrinth channel, and coding units can be generated. The sound beam splitting is directionally controlled by adjusting the sorting mode of the coding sequence; the sound focusing is directionally controlled by adjusting the sorting mode of the coding sequence and the number of the adjustable folding structure units. According to the invention, flexible and efficient directional control of sound beam splitting and sound focusing is realized, and the problems of insufficient reconfigurability, narrow frequency band, too high system complexity and high cost of an acoustic coding metasurface are solved.

The embodiment of the present application provides a fan, which comprises: a cylindrical part configured to be able to rotate with a rotating axis as the center; an impeller part configured at the radial outer side of the cylindrical part; a magnet provided to the inner wall of the cylindrical part; a stator at least partially accommodated in the cylindrical part; a tower part supporting the stator; a wall part configured at the radial outer side of the tower part, at least part of the wall part and the cylindrical part coincide and form a labyrinth structure in the radial direction, the cylindrical part comprises at least one annular cylinder wall, the wall part comprises at least two annular walls configured concentrically, or the cylindrical part comprises at least two annular cylinder walls configured concentrically, and the wall part comprises at least one annular wall. Through the embodiment of the present application, foreign matters can be effectively prevented from entering the inside of the fan.

A lamp holder relates to the technical field of power lines and comprises a labyrinth-shaped support component and a functional component, the labyrinth-shaped support component comprises a strip-shaped object in a labyrinth shape and side plates which are arranged on the two sides of the strip-shaped object and are concave in the middle, and the labyrinth-shaped support component can be bent in a three-dimensional mode. The functional component capable of providing the light source comprises a strip-shaped functional body and side clamping plates which are arranged on the two sides of the upper face of the strip-shaped functional body and are concave in the middle, and side plates on the two sides of the labyrinth type support component are located between the side clamping plates on the two sides of the upper face of the strip-shaped functional body and clamped and fixed by the two side clamping plates. The functional member can be three-dimensionally bent together with the labyrinth-type bracket member. Compared with the prior art, the modeling device has the advantages that modeling can be conveniently and rapidly carried out according to site requirements, and modeling can be conveniently completed through the support of the labyrinth structure.

The invention discloses a split modular plasma hazardous waste melting furnace, comprising an upper furnace body and a lower furnace body; the upper furnace body and the lower furnace body adopt a maze structure, and the joints between the two are filled with non-baking chromium-containing refractory mud for sealing; the furnace side module I and the furnace side module II are arranged in a ring shape inside the lower furnace body, and a water-cooled column is provided between the furnace side module I and the furnace side module II, and the adjacent furnace side module II, and an inlaid locking structure is provided; a furnace bottom module I is provided at the center of the inner bottom of the lower furnace body, and furnace bottom modules II and furnace bottom modules III are arranged in a ring shape around the inner bottom, and the interface between the furnace bottom module I and the furnace bottom module II and the furnace bottom module III is a two-level stepped maze structure, and the upper ends of the furnace side modules I and the furnace side modules II and the upper furnace body are male-female structures, and the lower ends thereof are in a two-level stepped maze structure with the interface between the furnace bottom modules II and the furnace bottom modules III. The overhaul cycle of the invention is controlled within 10 days, which has an order of magnitude improvement in the economic efficiency of the project.

This pump comprises a casing and an impeller that comprises a first shroud (720) that covers vane parts (710). The casing has a groove part (312) into which the tip (722a) of a suction port mouth part (722) of the first shroud (720) is inserted and an inside wall part (313) that is further toward the inner circumferential side than the groove part (312). A return passage (360) that has a labyrinth structure (361) that is formed by the suction port mouth part (722) and the groove part (312) on the inner circumferential side is formed between the casing and the first shroud (720). The first shroud (720) has an extending part (726) that has an opposing surface (726a) that is opposite an end surface (313a) of the inside wall part (313) that is on the vane part (710) side in the axial direction.

Compared with the prior art, the pressure relief sealing system of the slurry balance shield tunneling machine comprises a labyrinth pressing ring which is installed on a driving disc and used for sealing a gap between the driving disc and a driving box. The sealing body structure is mounted on the inner side of the driving box, and a sealing cavity is formed between the sealing body structure and the driving disc; the first finger-shaped seal, the second finger-shaped seal and the lip-shaped seal are sequentially mounted on the driving disc, and the first finger-shaped seal, the second finger-shaped seal and the lip-shaped seal sequentially divide a sealing cavity into a pressure relief cavity, a first grease cavity and a second grease cavity; the pressure relief channel is communicated with the pressure relief cavity; a grease filling channel; a labyrinth structure is formed between the labyrinth pressing ring and the driving box and is communicated with the pressure relief cavity; according to the scheme, the problem that a sealing system of a main drive consumes a large amount of lubricating grease when the shield tunneling machine works in a high-pressure muddy water environment is solved, the service life of a finger-shaped seal and a lip-shaped seal of the main drive when the shield tunneling machine works in the high-pressure muddy water environment is prolonged, and the cost is reduced.

The utility model discloses a waterproof bus installation structure in the bus waterproof field, which comprises a cabinet body assembly and a cabinet side plate, the cabinet side plate is provided with a first installation groove, and the first installation groove is internally provided with a first rectangular boss and a second rectangular boss; the fixing assembly comprises a bus frame embedded in the first mounting groove, a first rectangular groove and a second rectangular groove are formed in the two sides of the bus frame, a mounting table is arranged in the middle of the bus frame, a branching clamp is fixed in the mounting table, and a bus copper bar is connected to the branching clamp. The beneficial effects of the utility model are that the gaps generated after the cabinet body assembly and the fixing assembly are connected form the labyrinth structure, the labyrinth structure with the continuously changing gaps can block infiltrated water, and meanwhile, in order to prevent a large amount of water vapor from being gathered and overflowing from the labyrinth structure, the gathered water can be completely discharged out of the bus frame through the drainage pipeline, so that the service life of the bus frame is prolonged. And the waterproof performance is further improved.

The utility model relates to the technical field of engineering machinery, and discloses an output shaft end sealing structure assembly, a gearbox and operation machinery, and the output shaft end sealing structure assembly comprises an output shaft, a shell, an output flange, a rotary sealing piece and a dust cover. Wherein the dustproof cover is arranged at the joint of the output flange and the shell in a covering mode, at least one partition piece is arranged on the side, facing the rotary sealing piece, of the dustproof cover, and the partition piece extends in the axial direction of the output shaft so that the inner space of the dustproof cover can be divided into at least two independent cavities. The joint of the output flange and the shell is covered with the dustproof cover, the inner side of the dustproof cover is provided with the at least one partition piece, the inner space of the dustproof cover is divided into the at least two cavities in the radial direction, and therefore a labyrinth structure is formed, plastic isolation fine nets, fine sand, gravel and the like are not prone to entering the gap between the output flange and the shell, and the service life of the output flange is prolonged. Therefore, the rotary sealing element is effectively protected from being damaged, the service life of the rotary sealing element is prolonged, the maintenance cost is reduced, and the working efficiency is improved.

The utility model discloses an independent turbocharger with double sealing rings, which comprises a gas compressor shell, a turbine shell and a connector for connecting the gas compressor shell and the turbine shell, a rotating shaft is rotatably connected in the connector through a bearing, a circular groove is arranged in the end face of the connector, and a sealing ring is arranged in the circular groove. A sealing assembly is arranged in the circular groove; the sealing assembly comprises a first sealing disc and a second sealing disc which are independent of each other, the sealing effect can be improved, and the service life of the sealing device is prolonged. The first sealing disc and the second sealing disc abut against each other, the positions of the first sealing disc and the second sealing disc are fixed through the supporting ring and the clamping spring, and therefore the first sealing disc and the second sealing disc are not prone to moving and high in stability. Labyrinth structures are formed between the first sealing disc and the sealing sleeve and between the second sealing disc and the sealing sleeve, labyrinth paths are added through the design of the inner rings on the sealing discs and the inner disc body of the sealing sleeve, and the oil sealing effect is effectively achieved.

The utility model relates to the technical field of silencers, and discloses a labyrinth type silencer which comprises an installation body and a silencing body, the installation body comprises an air inlet hole, a connecting column, an installation shell, a plurality of through holes and two clamping blocks, and the silencing body comprises a silencing outer shell, a plurality of air outlet grooves, a plurality of outer silencing plates, an inner silencing plate, two connecting grooves and a clamping strip. According to the silencer, when sound enters the interior of the silencer body through the air inlet holes, the outer silencing plate and the inner silencing plate in the silencer body form a complex labyrinth type structure, so that gas needs to be turned for multiple times when flowing in the silencer, the complexity of an airflow path is increased, and the noise is reduced. Along with a series of complex paths of airflow in the silencer, sound waves can be gradually attenuated in the multiple reflection and refraction processes, so that the efficient silencing effect is achieved, the silencing efficiency is improved, meanwhile, the smoothness of air flowing is ensured, and using equipment cannot be blocked.

A connection structure is a structure for connecting a conductive busbar 10 to a connection target. The connection structure 100 comprises a connection section 18, which is provided on the busbar 10 and serves as the connection point for the connection target, and a holder 30, which is configured to receive foreign bodies that originate in the connection section 18. The connection section 18 includes a screw fastening section A between a screw 16, which extends in one thickness direction of the busbar 10, and a nut 17, into which the screw 16 is screwed. In the housing 30, several spaces, i.e., a first recessed section 36 and a second recessed section 37, which contain the foreign bodies, and separating sections, i.e., a first separating section P1 and a second separating section P2, which subdivide the several spaces, form a labyrinthine structure 38.

This utility model discloses an X-ray shielding room with a labyrinth structure, relating to the field of X-ray shielding room technology. It includes a ventilation component, comprising a shielding room body with lead plates installed on the inner wall of the body. The size of the lead plates is adapted to the shielding room body. A toothed plate is installed on the top of the shielding room body. This utility model allows for ventilation and heat dissipation when not in use by setting up the ventilation component. The position of the sealing plate can be adjusted by rotating the moving gears, controlling the opening and closing of the ventilation openings. When not in use, the ventilation openings can be controlled to open, thus facilitating heat dissipation and ventilation. This prevents the concentration of harmful gases inside the shielding room body from continuously increasing due to lack of ventilation, which could cause symptoms such as coughing, chest tightness, and sore throat, thus protecting the health of users. Two sets of guide rods can restrict the movement trajectory of the sealing plate, preventing deviation or tilting during movement.

An EPU (50) includes a motor unit (100), a blower device (120), and a labyrinth structure portion (700). The motor unit (100) includes a motor (61), an inverter (81), and a unit housing (101). The unit housing (101) accommodates the motor (61) and the inverter (81) in a unit space (102). In the unit housing (101), a unit inlet port (112) and a unit outlet port (114) are in communication with the unit space (102). In the EPU (50), as the blower device (120) blows air, cooling air flows into the unit space (102) from the unit inlet port (112) and flows out from the unit outlet port (114). The cooling air flows into the unit inlet port (112) after passing through the labyrinth structure portion (700). In the labyrinth structure portion (700), foreign matter is removed from the cooling air.

The invention relates to the technical field of putty powder screening, in particular to a putty powder screening device with a labyrinth structure. According to the putty powder screening device with the labyrinth structure, the feeding amount of putty powder can be controlled, and meanwhile the putty powder is effectively prevented from rising and diffusing. A putty powder screening device with a labyrinth structure comprises supporting legs, a screening bin, a labyrinth structure feeding hopper, telescopic plates and the like, the upper sides of the supporting legs are connected with the screening bin, the upper side of the left portion of the screening bin is connected with the labyrinth structure feeding hopper, and the multiple telescopic plates are slidably connected into the labyrinth structure feeding hopper. According to the putty powder screening device, by rotating an adjusting screw rod, a synchronous frame moves, telescopic plates are driven to move synchronously, and the distance between the telescopic plates is adjusted, so that putty powder enters the screening barrel from the gap between the telescopic plates, and the effects that the feeding amount of the putty powder can be controlled, and meanwhile, the putty powder is effectively prevented from rising and diffusing are achieved.

The invention discloses a split type protective cover which comprises at least two half cover bodies capable of being combined in a split mode. The bottom of each half cover body is provided with a partition plate extending along the contour of the cover body, and the partition plates are in lap joint with one another to form a labyrinth structure. The labyrinth structure is used for preventing external impurities from invading and allowing internal liquid to be discharged along a preset path; the top of each half cover body is provided with a locking assembly used for rapid locking and fixing so that rapid assembling and disassembling of the half cover bodies can be achieved. According to the invention, the protective cover is optimized to be of a left-right split structure, a top rapid locking and fixing mode is adopted, and meanwhile, the partition plates on the two sides extend and are in lap joint to form a labyrinth structure, so that the disassembly and assembly operation time of the protective cover can be greatly shortened, and installation can be completed only by aligning and attaching the half covers on the two sides, covering the fixing plates with holes and tightening the nuts; during disassembly, the half covers can be separated only by loosening the nuts and taking down the fixing plates, the cover body does not need to be moved integrally, and quick disassembly and quick assembly are achieved.