123 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.

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 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.

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.

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.

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.

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.

The invention discloses an automatic generation method and device of a game labyrinth, equipment and a storage medium, and relates to the technical field of game development. According to the method, the path density and the loop complexity of the labyrinth are dynamically balanced by presetting the number of tile paths and loop factors, and the labyrinth structure with randomness and strategy depth is generated on the premise that the accessibility of all cells is guaranteed. Compared with a traditional algorithm, the labyrinth path generated by the method has more branches, the loop distribution is more natural, and the interestingness and challenge of player exploration are remarkably improved; meanwhile, the algorithm is low in calculation complexity and can be efficiently adapted to a mobile terminal and embedded equipment, and a low-cost and high-flexibility labyrinth generation solution is provided for game developers.

To provide a gas seal structure of a rotary kiln which can increase durability even when a rubber member having low heat resistance is used.SOLUTION: Disclosed is a gas seal structure 30 in a rotary kiln 1 comprising: a kiln body 11; an object feed part 2; and a gas discharge part 20. The gas discharge part 20 comprises: an internal structural body 21 with an internal isolation wall 22 provided between the kiln body 11 and a feed pipe 4 of the object feed part 2; and an external structural body 25 with an external isolation wall 26 provided to sandwich the kiln body 11 with the internal isolation wall 22 of the internal structural body 21 and surround the kiln body 11. The gas seal structure 30 comprises: an internal seal part 32 having a labyrinth structure; an external seal part 31; and a cooling gas feed part 35 configured to feed a cooling gas into an external space 25h. A rubber member is used for a member constituting the external seal part 31.SELECTED DRAWING: Figure 1

The utility model discloses a turnover type top cover for an open-top box body, which is of a split opening and closing structure along the longitudinal axis of the open-top box body, is hinged with a side wall, and is positioned on the side wall after being turned over and opened; wherein when the upper cover and the lower cover which are oppositely opened are closed, the bottom surfaces of the upper cover and the lower cover are positioned at the joint part of the central axis of the open top box body and are provided with mutually matched rainproof sealants with labyrinth structures, and the lower cover is tightly pressed by the upper cover through gravity to realize sealing; the other three peripheries of the bottom surfaces of the upper cover and the lower cover are provided with grooves of labyrinth structures, and rainproof sealants are embedded into the grooves to be combined with the top of the open-top box body to achieve sealing. The top cover adopts a split structure, is connected with the side wall through the turnover seat, and is fixed on the side wall after being turned over, so that the ground space is not occupied; the top cover rotates around the shaft to ensure accurate alignment in the opening and closing process; rubber strips are arranged on the periphery of the bottom of the top cover and deform when making contact with a top beam rainproof plate, rainproof sealing is achieved, the left-right overturning type top cover is divided into an upper cover body and a lower cover body, the upper cover body presses the lower cover body through gravity, and a labyrinth structure is arranged for rainproof sealing.

The utility model relates to the technical field of sealing cover design, and discloses a novel anti-leakage sealing cover which comprises a sealing connecting plate, an outer sealing plate and an externally-expanded lip edge, the outer sealing plate is arranged on the outer side of the sealing connecting plate, and the externally-expanded lip edge which wraps a clamping sleeve at the top of a steering connecting end and extends downwards is arranged on the edge of the outer side of the bottom of the outer sealing plate. The steering structure is of an irregular labyrinth structure, rubber properties are combined with the appearance characteristics of the steering structure, all-directional protection can be achieved on the steering bearing and the steering assembly, lubricating oil on the steering bearing is prevented from seeping out, and pollutants outside the mounting end of the steering bearing are also prevented from entering the steering bearing; the sealing cover is in embedded connection with the top clamping sleeve of the steering connecting end through the first connecting clamping groove, sealing protection of the steering connecting end is effectively achieved through cooperation of the sealing cover and the outer lip edge, the first lip edge and the second lip edge are in sealed connection with the steering connecting end, and pollutants in the environment are prevented from entering the steering bearing.

The application discloses an oil-cooled driving motor with a multistage zigzag labyrinth ventilation structure, comprising a shell, a motor cavity and an end cover, wherein the shell is provided with a first cavity and a second cavity, small passages are left below the first cavity and the second cavity, the first cavity and the second cavity are combined into a multistage labyrinth structure, and an oil-proof ventilation valve is arranged at the axial end of the second cavity. The multistage labyrinth structure formed by the first cavity and the second cavity is cooperatively designed with the end cover. The application can realize multistage separation and efficient interception of oil-gas mixture, completely block oil droplets from entering the oil-proof ventilation valve, prevent oil leakage caused by the plugging of the oil-proof ventilation valve, ensure the smooth backflow of separated cooling oil to the motor cavity, reduce oil consumption, and is compact in structure, easy to process and assemble, suitable for the layout of various oil-cooled motor end covers, and suitable for popularization and use.

The utility model provides a rapid exhaust device for a commercial truck seat and an automobile seat, and relates to the technical field of automobile seats. The rapid exhaust device for the commercial truck seat comprises a labyrinth support body, an air valve sliding support and a button. A valve body assembly is arranged in the maze support body, a guide rail is arranged on the outer wall of the maze support body, and the maze support body is sleeved with the air valve sliding support in a sliding mode. An air valve reset elastic piece is arranged between the labyrinth support body and the air valve sliding support, and the compression direction of the air valve reset elastic piece is consistent with the sliding direction of the air valve sliding support. A labyrinth structure is arranged on the labyrinth support body, a labyrinth locking piece matched with the labyrinth structure is arranged on the air valve sliding support, and the labyrinth locking piece can lock or unlock the valve body assembly in the moving process of the air valve sliding support. The button is installed on the air valve sliding support. The automobile seat comprises the quick exhaust device for the commercial truck seat. The technical effect of convenient use is achieved.

A labyrinth structure 1 of an intake duct 2 includes an upper support member 6 extending rearward of the intake duct 2 and an upper mount bracket 5 extending downward of the intake duct 2. The labyrinth structure 1 also includes a pair of air guide plates 11 disposed outside the intake duct 2 and a cover member 10 covering the intake duct 2 and the upper support member 6. An intake port 2B of the intake duct 2 is opened toward a first air guide plate 11R, and an air gap is formed between the intake port 2B and the first air guide plate 11R. From the first air guide plate 11R, a projecting wall 11A projects toward an end portion 2A of the intake duct 2 where the intake port 2B is formed. A projecting end of the projecting wall 11A overlaps with the end portion 2A as viewed from the front, and an upper portion of the projecting wall 11A overlaps with a lower surface of the cover member 10 as viewed from the front.

The utility model discloses an ultra-low torque oil slinger combined type sealing structure which comprises a sealing ring framework and an oil slinger framework, the sealing ring framework is provided with a first rubber body, the oil slinger framework is provided with a second rubber body, the first rubber body is sequentially provided with a water retaining brim, a labyrinth retaining brim, a labyrinth lip, a muddy water lip and a non-contact grease lip, and the second rubber body is sequentially provided with a water retaining brim, a labyrinth retaining brim, a labyrinth lip, a muddy water lip and a non-contact grease lip. The oil slinger framework is further provided with a processing layer making contact with a lip opening of a muddy water lip. The second rubber body is provided with a static sealing lip and an oil slinger disengagement preventing point, and a labyrinth type structure is formed among the static sealing lip, the labyrinth blocking eave and the labyrinth lip.

The utility model discloses an electric tool which comprises a shell, an output shaft and a dustproof cover, the shell comprises an output shaft hole, and the output shaft hole comprises a dustproof cavity communicated with the outside; the output shaft penetrates through the output shaft hole, and the power output section of the output shaft extends out of the dustproof cavity to be connected with a load. The dustproof cover is located in the dustproof cavity, the dustproof cover and the inner wall of the dustproof cavity are arranged in a clearance mode, and the dustproof cover fixedly sleeves the output shaft and rotates synchronously with the output shaft. At least two labyrinth structures are formed between the dustproof cavity and the dustproof cover, each labyrinth structure comprises an annular groove formed in one of the dustproof cavity and the dustproof cover and an annular convex rib formed on the other one of the dustproof cavity and the dustproof cover, the annular convex rib partially extends into the annular groove, and a gap is formed between the annular convex rib and the annular groove. According to the electric tool provided by the utility model, the dustproof and waterproof effects of the output shaft hole are improved.

The utility model provides a deposition ring, a process assembly and a process chamber. The deposition ring comprises a deposition groove, wherein the deposition groove comprises a first convex ring part located on the inner side, a second convex ring part located on the outer side and a bottom wall between the first convex ring part and the second convex ring part; the bearing part is located on the outer side of the deposition groove, the top of the bearing part is provided with an abutting face, the plane where the abutting face is located is lower than the top of the second convex ring part, and an annular groove is formed in the abutting face. The deposition ring in the embodiment of the utility model is used for being matched with a shielding ring in a process chamber, as shown in the figure, when the deposition ring is matched with the shielding ring, the abutting surface abuts against the shielding ring, and the annular groove is formed in the abutting surface, so that a labyrinth structure can be formed between the abutting surface and the deposition ring; the target material particles are not prone to entering the abutting position of the abutting face and the deposition ring, and therefore the probability that the shielding ring adheres to the deposition ring is reduced.

The utility model discloses an air sealing device which comprises an air sealing shaft sleeve. The air sealing shaft sleeve is arranged on the outer surface of a main shaft in a sleeving mode and is tightly connected with the main shaft. An air seal disc is arranged on one side of the air seal shaft sleeve and arranged on the outer surface of the main shaft in a sleeving mode, a labyrinth structure is arranged between the air seal shaft sleeve and the air seal disc, one end of the labyrinth structure is connected with the air seal disc, the other end of the labyrinth structure is in clearance fit with the air seal shaft sleeve, and an air inlet hole and an air outlet hole are formed in the air seal disc. Protective gas enters the gas sealing disc from the gas inlet hole, passes through the labyrinth structure and enters the mixing barrel from the gas outlet hole. A labyrinth structure is arranged between the gas seal shaft sleeve and the gas seal disc, the gas seal disc is provided with a gas inlet hole and a gas outlet hole, protective gas enters the gas seal disc from the gas inlet hole, passes through the labyrinth structure and enters the mixing barrel from the gas outlet hole, powder can be effectively prevented from entering the main shaft, abrasion of the main shaft is reduced, and the service life of the main shaft can be prolonged.