178 results about "Labyrinth seal" patented technology

A sealing mechanism for a rotating mechanism, a rotating mechanism and a sealing method. The rotating mechanism comprises a rotor having a rotary disk (1) and a stator accommodating the rotor. The sealing mechanism comprises a first flow-blocking portion (4), which protrudes and is provided on an end face of the rotary disk (1), wherein a labyrinth seal and a spiral seal are provided in combination at the first flow-blocking portion (4); and a first corresponding flow-blocking portion (5), which is recessed, is provided on an inner surface of the stator and is in clearance fit with the first flow-blocking portion (4). The first flow-blocking portion (4) has a first recessed portion and / or protruding portion (6) on a circumferential surface thereof, the first corresponding flow-blocking portion (5) is flatly constructed or provided, on a circumferential surface thereof, with a first corresponding protruding portion and / or recessed portion (7) which are / is in clearance fit with the first recessed portion and / or protruding portion (6), and the first flow-blocking portion (4) and the first corresponding flow-blocking portion (5) form a labyrinth seal at the corresponding top or bottom section thereof respectively and form a spiral seal at a corresponding side section respectively, which can further suppress fluid leakage, thereby improving the sealing performance.

An enclosure is provided with a first area and a second area, wherein the enclosure has an outer opening to the first area, an intermediate opening or a labyrinth seal is formed between the first area and the second area, and wherein the outer opening has a larger cross-section than the intermediate opening in the case of the intermediate opening.

The utility model relates to the technical field of precious metal smelting, in particular to a mounting structure for a driving part of a driving roller of a pressurized copper material removal banded extruder. The transmission mechanism comprises a main shaft, a mounted bearing, a chain wheel thrust ring, a chain wheel, a mounting seat, a gear, a labyrinth seal and a driving roller are sequentially mounted on the main shaft in a penetrating manner from left to right, the mounting seat is of an annular structure with a middle protrusion, the middle protrusion penetrates through the chain wheel, and the chain wheel is fixedly mounted on the mounting seat through a pin bolt and a pin nut. And a chain wheel thrust ring is arranged at the end part of the chain wheel, is fixed with the chain wheel through a bolt, and is movably connected with the mounting seat through a clamping groove. According to the installation structure, when overload torque is input into the chain wheel or a hard object is clamped between the driving roller and the driven roller meshed with the driving roller, the pin bolt is cut off, and therefore the spindle head of the spindle is protected against deformation. The utility model provides the structure which is easy to install, convenient to maintain, simple in structure and low in cost, and ensures that the pressurized copper material removal extruder stably runs for a long period.

The invention relates to the technical field of fluid conveying, and discloses a high-sealing-performance rotary joint and a preparation technology thereof.The rotary joint comprises a rotary joint body I and a rotary joint body II which is rotatably arranged, and a leakage early warning structure is arranged on the rotary joint body I; the structure comprises an early warning channel, a liquid accumulation groove used for collecting a trace amount of leaked fluid and an observation window installed outside. A two-way labyrinth type sealing structure is arranged on the outer side of the thrust ball bearing, so that the environmental adaptability is improved; according to the manufacturing technology, after assembly is completed through a low-temperature stress-free method, in-situ final machining is conducted on the device under the dynamic standard, specifically, a thrust ball bearing of the device serves as the dynamic standard to drive the rotating joint body II to rotate, and final micromachining is conducted on the dynamic sealing face. According to the invention, the assembly accumulative error is fundamentally eliminated, the dynamic sealing surface with ultrahigh geometric accuracy is obtained, the sealing performance and the operation safety of the rotary joint are obviously improved, and the service life of the rotary joint is obviously prolonged.

An enclosure is provided with a first area and a second area, wherein the enclosure has an outer opening to the first area, an intermediate opening or a labyrinth seal is formed between the first area and the second area, and wherein the outer opening has a larger cross-section than the intermediate opening in the case of the intermediate opening.

The invention relates to the technical field of molten iron, and provides a molten iron stirring device which comprises a bottom plate, a stirring barrel is fixedly connected to the top end of the bottom plate, a second supporting frame is fixedly connected to the top end of the stirring barrel, a power assembly is installed at the top end of the second supporting frame, and an injection assembly is installed on the portion, close to the bottom end, of the stirring barrel. A sealing assembly is installed at the center of the bottom wall of an inner cavity of the stirring barrel, a first supporting frame is fixedly connected to the top end of the bottom plate and located on the outer side of the stirring barrel, a conveying assembly is installed at the top end of the first supporting frame, a gear drives a supporting plate to rotate under limitation of the supporting plate, and the supporting plate drives stirring blades to rotate through stirring rods. And the stirring rod drives the movable ring to rotate on the supporting ring, the first gear ring and the second gear ring are designed in a staggered mode to form labyrinth sealing, and meanwhile the first gear ring rotates in the static ring. By means of the technical scheme, the technical problem that in the related technology, the efficiency is low when molten iron is desulfurized is solved.

The invention relates to a method for producing a labyrinth seal (1) for sealing a sealing region (2) between a rotor and a stator of a rotating machine, in which method a seal carrier (8) and a sealing element (3) are produced, the sealing element (3) having a convex sealing ring (4) which is arranged opposite the rotor surface, the sealing element (3) and the seal carrier (8) are connected to one another in a form-fitting manner.

This invention provides a sealing system for the output shaft of an amphibious vehicle side reducer, comprising a primary sealing assembly, a secondary sealing assembly, a tertiary sealing assembly, and a pressure relief and drainage assembly. A labyrinth seal formed by the oil baffle ring and oil seal seat filters and blocks large abrasive particles, increasing the sealing path and thus extending the intrusion time of impurities. A felt ring further seals the system, filtering out fine abrasive particles from the impurities. Multiple oil seals work together to seal against seawater and powdery sludge. When seawater and sludge reach the cavity outside the multiple oil seals through the primary and secondary seals, a one-way valve opens when the pressure inside the cavity reaches a preset value. At this point, the seawater and sludge can be discharged through the drain hole, reducing the risk of seal failure due to pressure and wear. Through this multi-stage sealing and pressure relief design, seawater and flowing sludge in the seawater can be effectively prevented from entering the side reducer cavity, thus preventing damage to the side reducer.

The invention relates to a light-weight TPcon special solder strip annealing device which comprises a box body and a cooling water tank fixed to the surface of the box body, an upper annealing wheel, a third wheel and a driven wire passing wheel are rotationally arranged on the surface of the box body, and the driven wire passing wheel is located in an inner cavity of the cooling water tank. According to the special light-weight TPcon solder strip annealing device, a dynamic labyrinth sealing structure composed of a fluororubber sealing sleeve, an adjustable movable plate and a partition plate is arranged and combined with a gas storage tank buffer gas supply system, on the premise that a solder strip continuously penetrates through the dynamic labyrinth sealing structure, multiple zigzag gas leakage paths are formed, the gas leakage resistance is greatly increased, and the service life of the solder strip is prolonged. According to the system and the method, by matching with a micro-positive pressure environment maintained by the gas storage tank, 'on-demand supplementation 'is realized, most of nitrogen is sealed in the system for cyclic utilization, only extremely small leakage amount needs to be supplemented, and compared with a traditional continuous purging mode, more than 90% of nitrogen consumption can be saved, and the production cost is remarkably reduced.

The utility model provides a non-contact sealing protective structure, which relates to the technical field of machine tool spindles and comprises a spindle rotator, a spindle non-rotator, a protective cover, an end cover, a central spindle, an inner labyrinth ring, an outer labyrinth ring and an air curtain ring groove. The main shaft rotating body is located in the main shaft non-rotating body, the protective cover is installed on the outer side of the end cover, the protective cover and the main shaft rotating body are fixed through a bolt, the end cover is arranged on the periphery of the shaft core in a sleeving mode, the end cover and the main shaft non-rotating body are fixed through a bolt, and an air curtain ring groove is formed by the end cover and the main shaft non-rotating body. The inner labyrinth ring serving as a part of a main shaft rotating body is combined with the outer labyrinth ring serving as a part of a main shaft non-rotating body; according to the non-contact type sealing protection structure, the sealing performance of the main shaft under the severe machining environment is effectively improved by comprehensively applying the labyrinth sealing technology, the dynamic pressure sealing technology and the air curtain sealing technology, and the normal service life and the machining precision of the main shaft bearing are guaranteed.

The invention relates to an inflatable rotary kiln sealing device, which belongs to the technical field of industrial kiln equipment, and comprises a static housing with an opening and a dynamic kiln body capable of rotating relatively, which are connected through a sealing assembly, the sealing assembly comprises an annular frame rotationally connected to the outer wall of the dynamic kiln body, a first annular blocking piece fixedly connected to the outer wall of the annular frame and a second annular blocking piece fixedly connected to the outer wall of the dynamic kiln body, and a circumferential positioning sealing mechanism, a plurality of axial positioning sealing mechanisms and an airtight sealing mechanism are arranged on the annular frame. The circumferential positioning sealing mechanism and the axial positioning sealing mechanism are used for restraining the motion freedom degree of the dynamic kiln body and forming sealing, and the airtight sealing mechanism is used for forming an airtight barrier for isolating the internal environment and the external environment. The labyrinth seal with the trumpet-shaped opening is arranged, the inert gas is injected to form the high-pressure air curtain, non-contact type two-way air seal is achieved by means of the gas dynamics and the differential pressure principle, and gas channeling and dust invasion are effectively blocked.

The utility model relates to agricultural wheel hub unit technical field, and disclose a kind of agricultural wheel hub bearing unit framework oil seal, this agricultural wheel hub bearing unit framework oil seal, including outer framework, the outer framework outside closely adheres to wheel hub inner hole inside, outer framework baffle is provided at outer framework one end, and the other end of outer framework is connected in inner sealing lip inside. The agricultural wheel hub bearing unit framework oil seal, in order to make sealing effect better and improve the service life of oil seal body, by being provided with outer framework, inner framework, outer sealing lip, inner sealing lip, outer sealing end face small lip, outer framework baffle, compression spring, cavity and sealing body, to have labyrinth seal effect, and three main lips are designed as 10 ° inclination, both have the resistance ability of strong resistance to external foreign matter, significantly improve the strength and reliability of dustproof function, in turn can make sealing effect better and improve the service life of oil seal body.

The invention relates to the technical field of material precision machining equipment, and discloses an ultra-high-speed cutting type precision grinding machine which comprises a rack, a driving device, a grinding cavity provided with a feeding port and a discharging port, and a rotary movable cutter assembly and a fixed static cutter assembly which are arranged in the grinding cavity and driven by a main shaft. And a combined sealing structure is arranged at a relative motion interface between the rotary moving cutter assembly and the fixed static cutter assembly and comprises a non-contact labyrinth seal and a contact mechanical seal which are sequentially arranged in the potential leakage direction of materials. Through the combined sealing design of labyrinth sealing and mechanical sealing, multiple barriers are arranged on a key material leakage path, the labyrinth sealing dissipates material kinetic energy in advance and blocks most materials, and the mechanical sealing provides final reliable end face sealing, so that the leakage rate is reduced, coarse and fine materials are effectively prevented from being mixed, and the sealing effect is improved. And extremely high particle size uniformity and consistency of the ground product are ensured.

The application discloses a liquid film thrust disc sealing structure and relates to the technical field of thrust disc sealing technology. The thrust disc sealing structure comprises a mounting seat, one side of the mounting seat is used for mounting a thrust disc body, and the other side of the mounting seat is provided with a dynamic ring. An end cover assembly is internally provided with a static ring matched with the dynamic ring. One side of the dynamic ring opposite to the static ring or one side of the static ring opposite to the dynamic ring is provided with a dynamic pressure groove, so that a liquid film with a certain thickness is formed between the dynamic ring and the static ring, no-friction operation is realized, the labyrinth sealing of the unit thrust disc is replaced, and the continuous operation cycle of the unit is prolonged. The thrust disc assembly comprises the liquid film thrust disc sealing structure and the thrust disc body, and the thrust disc body is installed on the side of the mounting seat far from the static ring. The screw compressor comprises the thrust disc assembly, and the continuous operation cycle of the unit can be prolonged.

The application relates to the technical field of sealing joints, in particular to a sealing joint for a high-pressure hydrogen gas conveying pipeline, which comprises a male connector seat, a female connector seat and a valve core group, the joint ends of the male connector seat and the female connector seat are respectively provided with lock plates and flange joint plates, the outer periphery of the flange joint plate is provided with wedge locking blocks and screw rods, the opposite surfaces of the lock plate and the flange joint plate are respectively provided with first sealing ring groups and second sealing ring groups, the surface of the lock plate is provided with a sealing gasket, the valve core group comprises a core shaft, a spring, a valve sleeve and a guide head, and a gradually tapered section, a throat section and a gradually expanded section flow channel structure are formed between the valve sleeve and a flow channel. The male connector seat and the female connector seat are quickly locked and connected through the wedge locking blocks, a composite sealing structure is formed through labyrinth sealing and elastic sealing, the static pressure of a joint jointing area is reduced through the Venturi effect, the hydrogen gas leakage driving force is reduced, a multilayer leakage prevention mechanism is formed, and the sealing joint has the advantages of good sealing performance, high connection stability and suitability for high-pressure hydrogen gas conveying working conditions.

The utility model discloses a powder cooling and transferring device for a rotary kiln, which comprises a cooling machine, a gas-collecting hood sleeved on the body of the cooling machine, a labyrinth seal structure arranged between the cooling machine and the gas-collecting hood, a hopper fixedly connected with the bottom of the gas-collecting hood, a K-type thermocouple and a level gage arranged inside the hopper, an ash discharge port arranged at the bottom of the hopper, and a gas discharge port arranged at the bottom of the hopper. The ash discharge port is connected with a first screw conveyer, and the first screw conveyer is connected with a second screw conveyer; by arranging the labyrinth sealing structure, abrasion of the gas collecting hood caused by powder scouring is effectively avoided, negative pressure fluctuation is reduced, the electric gate valve can enable the whole hopper to be in a totally-closed state in the operation process, the silicon carbide coating can reduce scouring abrasion of high-temperature materials to the hopper and the labyrinth sealing structure, and the service life of the hopper is prolonged. The K-type thermocouple and the level gage can upload measured data to the PLC in real time, and interlocking control is facilitated.

The utility model relates to ultra -fine powder production technical field, concretely relates to a kind of grading device of ultra -fine powder dry grinder. Including machine body seat, the middle position of machine body seat upper side wall is fixed with powder outlet pipe, the inside of machine body seat is provided with grading assembly, the grading assembly includes the assembly pipe vertically fixed in the inside of powder outlet pipe, the upper end of assembly pipe is through powder outlet pipe side wall and extends out, the inside of assembly pipe is coaxially rotationally arranged with main shaft by bearing, the upper end of main shaft extends to the outside of assembly pipe and is provided with driving mechanism, and the driving mechanism is used to drive main shaft rotation. The utility model, through the combination of gland and inlay ring to form labyrinth seal structure, and in its inside filling high-temperature grease constitutes airtight sealing barrier, so that the dust in powder outlet pipe cannot invade assembly pipe inside through labyrinth seal structure, simultaneously in avoiding bearing surface dust accumulation, thereby significantly prolong the service life of bearing in dust environment.

The high-protection outer rotor axial flow fan comprises an outer rotor motor and a wind wheel, the outer rotor motor comprises a base, an outer rotor assembly, a rotating shaft and a stator assembly, and the base comprises a bottom plate and a sleeve protruding upwards from the middle of the top face of the bottom plate. The shaft support is installed on the two bearings, the top end of the shaft support is connected with the outer rotor assembly, the stator assembly is arranged outside the sleeve in a sleeving mode, an annular boss is arranged on the edge of the bottom plate, and a labyrinth sealing structure is formed by the annular boss and the end of the outer rotor assembly. The wind wheel comprises blades and a hub, the blades are installed on the outer side of the hub, and the hub is installed outside the outer rotor assembly through an installation support. The base is sleeved with an outer water retaining ring, an inner water retaining ring is installed on the installation support, and the outer water retaining ring and the inner water retaining ring are matched to form a water retaining device on the periphery of the labyrinth sealing structure. The waterproof and dustproof levels of the axial flow fan are greatly improved, the reliability is high, and the failure rate is low.

The application discloses a kind of molten salt pump shaft with active combined sealing system and its sealing control method, belong to sealing technical field, the system includes combined mechanical seal unit, cooling jacket and gas auxiliary sealing unit, combined mechanical seal unit is set in pump shaft outside and is butted with molten salt tank opening, forms multistage mechanical barrier;Cooling jacket is covered in the periphery of combined mechanical seal unit and actively cooled;Gas auxiliary sealing unit is set below it, and protective gas is introduced and forms positive pressure area, while protective gas is introduced into the internal cavity of combined mechanical seal unit by gas passage;In addition, sealing control method includes starting water cooling cycle, introducing protective gas and shunting to labyrinth seal cover and internal cavity, forming multistage collaborative sealing;The application is synergized by active cooling, gas positive pressure and mechanical barrier, effectively prevents water vapor from invading, improves sealing reliability and durability, reduces operating cost.

The present utility model relates to a cycle gas refrigerator and an apparatus for liquefying a feed fluid at low temperature. The cycle gas refrigerator comprises a compression system, a cooling system and an expansion system, the expansion system comprising at least one expansion turbine coupled to a compressor, the expansion turbine and the compressor each being coupled to one end of a common shaft, the expansion turbine, the compressor and the shaft being housed in a housing, the housing accommodating a first chamber for the compressor, an intermediate second chamber for the shaft and a third chamber for the turbine, the refrigerator comprising a set of pressurized fluid circuits in communication with at least two cavities located in the second chamber for supplying a pressurized gas flow to attenuate or counteract the axial forces acting on the shaft, the shaft comprising at least one disc-shaped flange located between the turbine and the compressor, the flange extending transversely to its axis of rotation, the flange being associated with at least one labyrinth seal for longitudinally separating two cavities intended to be subjected to different pressures on either side of the flange.

This utility model discloses a submersible full-flow pump with adjustable blade angle, including a guide vane body. A rotor sleeve is installed at the left end of the guide vane body, and a water inlet horn is installed at the left end of the rotor sleeve. A wet stator assembly is provided on the outside of the rotor sleeve, and a rotor core is installed on the outside of the wet stator assembly. The rotor core is connected to the rotor sleeve. By adopting a labyrinth seal structure for the guide vane body, the water inlet horn, and the rotor sleeve, the possibility of foreign matter entering the motor cavity can be avoided, effectively ensuring the service life of the wet motor windings. By changing the connection between the outer circle of the blade and the rotor sleeve from cylindrical to spherical, and also changing the connection between the inner circle of the blade and the outer circle of the hub from cylindrical to spherical, the blade can rotate along the blade axis within two corresponding spherical bodies. This achieves the purpose of arbitrarily adjusting the blade angle as needed, and also allows the blade to be replaced individually according to the wear condition.

The invention relates to a two-dimensional piston pump with a labyrinth seal. The two-dimensional piston pump comprises a pump shell, a driving shaft is arranged on one side of the pump shell, an inlet is formed in the other side of the pump shell, a cylinder body is fixed in the pump shell, cam guide rails are fixed to the two ends of the cylinder body, and a wave crest on the cam guide rail on one side corresponds to a wave trough on the cam guide rail on the other side; a group of first piston grooves which are uniformly distributed along the center of the piston are formed in the piston, and a second piston groove is formed between every two adjacent first piston grooves; a group of transverse through holes are formed in the cylinder body, a group of first communicating holes communicated with the transverse through holes and the piston cavity are formed in the cylinder body, an annular groove is formed in the pump shell, a group of second communicating holes communicated with the annular groove and the piston cavity are formed in the cylinder body, and an outlet communicated with the annular groove is formed in the pump shell. According to the invention, the rotary motion is converted into reciprocating direct motion, the piston is not in contact with the sealing element, the maintenance cost is low, the oil pumping efficiency is high, and the device is worthy of popularization and application.

The application discloses a labyrinth seal robustness test platform in a non-rigid rotor system and relates to the technical field of gas turbine engines. The platform comprises an axial displacement mechanism, a variable stiffness system and a labyrinth element test section. The variable stiffness system is installed on the top of the axial displacement mechanism, and the labyrinth element test section is connected with the axial displacement mechanism through a main shaft connecting plate. The axial displacement mechanism is used for realizing axial position adjustment and axial displacement deviation injection. The variable stiffness system is used for realizing continuous variable stiffness adjustment. The test section is used for developing principle tests of different labyrinth configurations. The injection of labyrinth gap deviation is realized by installing electric heating sheets on the surface of the labyrinth disc. The test system composed of the three parts enables the test platform to study the influence of the axial displacement-radial gap-pneumatic force coupling on the labyrinth seal performance in the non-rigid rotor system and the response law of the seal system to the axial displacement or the radial gap deviation.

The application discloses a gas-suspension low-temperature turbine expander, which comprises a main shaft, an expansion end diffuser, an expansion end impeller, a nozzle, an expansion end volute, an expansion end cover plate, a shell, an axial displacement fixing device I, a thrust disc I, an exhaust pipeline, a thrust disc II, an axial displacement fixing device II, a braking end cover plate, a connecting pipeline, a spiral refrigeration pipeline inlet, a spiral refrigeration channel, a spiral refrigeration pipeline outlet, a braking end volute, an electric adjusting device, a sealing device, a braking end inlet flow guide section, an adjustable filter screen, a fixed filter screen, a braking end impeller, a braking end diffuser, a heat dissipation fin, a labyrinth sealing exhaust passage, an electric eddy current sensor, an air inlet pipeline, a labyrinth seal, a water pump, a water inlet pipeline and a waterway connecting pipeline. Cold energy is generated at the expansion end, and the braking end closed loop adjusts the load to ensure safe operation. The gas-suspension bearing is full-movement, and effectively supports the stable operation of the rotor at an ultrahigh rotating speed. The device can be used as a core cold production device in the liquefaction, separation and refrigeration process of helium, hydrogen, nitrogen and air. The device has compact overall structure, high environmental adaptability and high reliability, and realizes the design goals of oil-free operation and economic efficiency.

The utility model discloses a bearing chamber sealing structure for a roller cage shoe. The bearing chamber sealing structure comprises a wheel shaft, a dynamic sealing assembly, a tapered roller bearing, a bearing sleeve and a static sealing assembly. The bearing has the advantages that the dynamic sealing assembly and the static sealing assembly are integrated at the inner end and the outer end of the bearing chamber through the multi-sealing collaborative design, and axial protection and radial protection are formed. Compared with a single labyrinth seal, the radial sealing rigidity is strengthened through interference fit of the rigid sleeve and the main shaft, meanwhile, axial unbalance loading is counteracted through symmetrical arrangement of the framework oil seals, and the dynamic sealing reliability is remarkably improved; the annular groove and the sealing table are additionally arranged at the static sealing end, stepped end face sealing is formed by the static sealing end and the outer end face of the bearing sleeve, and compared with plane end face sealing, slurry particles can be effectively intercepted, and the abrasion rate of a sealing interface is reduced.

A suspension thrust bearing unit includes upper and lower annular caps and a rolling-element bearing therebetween. The lower annular cap includes an annular circumferential groove between first and second radially outwardly extending seal flanges, and the upper annular cap includes an outer axial skirt that extends axially from the upper cap towards the lower cap and radially surrounds the second seal flange. The first and second seal flanges and the axial skirt form a labyrinth seal. The groove includes a plurality of circumferentially spaced ribs each extending radially outward from the lower cap and axially from the first seal flange to the second seal flange, and the plurality of ribs are at least partially located inside the outer axial skirt.

The utility model discloses a kind of dynamic sealing waterproof structure and lathe spindle box, including main shaft flange, sheath, front gland and rear end sealing assembly, the outer circle of main shaft flange is provided with water throwing groove outwardly with slope, cooling liquid is thrown to the water accumulation groove of sheath inner wall by centrifugal force, and discharge through drain hole, the annular protrusion of front gland and the positioning groove of main shaft flange form labyrinth seal, extend liquid penetration path, residual penetration is blocked by combining internal turbulent flow and pressure difference, rear end is sealed by rear sealing ring and rear gland Dustproof Anti-fog by axial;When main shaft rotates, flange outer circle and shaft neck form outward airflow, cooperate with centrifugal force to accelerate drainage and block backflow;Multi-stage sealing design adapts full speed condition, low speed relies on mechanical water throwing, high speed uses pressure difference to strengthen efficiency, compact structure and convenient maintenance, significantly reduce leakage risk, prolong bearing life, applicable to complex workpiece efficient processing.

The embodiment of the invention discloses a method and a system for predicting flow loss of a labyrinth seal. The method comprises the following steps: defining geometric parameters of the labyrinth seal and physical parameters of a working medium; calculating dimensionless parameters for representing the flow state based on the geometric parameters and the physical parameters; selecting a corresponding flow loss coefficient calculation formula according to the calculation result of the dimensionless parameter; and calculating the flow loss of the labyrinth seal based on the flow loss coefficient. According to the embodiment of the invention, the flow loss of the labyrinth seal can be accurately and quickly predicted, the problem of flow loss evaluation precision of the labyrinth seal is solved, the loss evaluation speed is improved, the design level of the labyrinth seal and even turbine machinery is improved, and the method has wide applicability to different engineering problems.