71results about How to "Reduce axial force" patented technology

The invention discloses a carburizing and quenching process of a thin-wall gear and a clamping tool of the thin-wall gear. The carburizing and quenching process comprises process parameters of temperature, time, flow, carbon potential, cooling speed and the like in stages of pre-cleaning, pre-oxidation, preheating, strong carburizing, diffusion, cooling, quenching, tempering and the like. It needs to be explained that in the technical process, the purpose of reducing the heat treatment deformation quantity of the thin-wall gear is achieved by optimizing the hanging and clamping mode of the thin-wall gear and improving the temperature and time parameters during carburizing and quenching in the scheme. Besides, a clamping tool suitable for the process is designed in the scheme, so that the clamping stability of the thin-wall gear during carburizing and quenching treatment is improved, and the heat treatment deformation quantity of the thin-wall gear is further reduced.

The invention discloses a rigid-flexible coupling heat-proof skirt for load reduction of a reusable rocket engine nozzle. The rigid-flexible coupling heat-proof skirt comprises a sleeve, a heat-proof skirt pressing plate, an upper pressing plate, a lower pressing plate and a flexible heat-proof skirt belt, wherein the sleeve is connected with the rocket tail section; the flexible heat-proof skirt band is arranged in the sleeve; the outer edge of the flexible heat-proof skirt belt is tightly pressed on the sleeve by the heat-proof skirt pressing plate; the heat-proof skirt pressing plate, the flexible heat-proof skirt belt and the sleeve are laminated, pressed and connected; the upper pressing plate is connected with a fireproof plate of the rocket engine; the inner edge of the flexible heat-proof skirt belt is tightly pressed on the upper pressing plate by the lower pressing plate; the lower pressing plate, the flexible heat-proof skirt belt and the upper pressing plate are connected in a stacked and pressed mode. The transverse load of the engine jet pipe is greatly reduced.

The invention discloses a system for conveying pipe fittings, and belongs to the technical field of pipe fitting machining. The conveying device comprises a conveying frame, a pushing mechanism and a plurality of carrier roller assemblies, the pushing mechanism comprises a push rod and a conveying driving mechanism, a rod head and a follow-up pipe head are arranged on the push rod, a positioning ring table is arranged on the follow-up pipe head, and the follow-up pipe head is rotatably arranged on the rod head or the push rod; the conveying driving mechanism comprises a driving wheel, a driven wheel, a synchronous belt, a driving motor and a clutch used for cutting off or connecting power transmission between the driving motor and the driving wheel, and the push rod is connected with the synchronous belt. The pipe fitting feeding device is simple in structure, the push rod pushes pipe fittings to be fed, the push rod is pushed to return when the pipe fittings are discharged, the insertion matching state of the push rod and the pipe fittings is kept all the time, jumping and noise generated when the pipe fittings are discharged are reduced, throwing-out of cutting fluid in the pipes can be reduced or even avoided, abrasion between the pipe fittings and the push rod or the rod head is reduced along with rotation of the movable pipe head, and the service life of the pipe fittings is prolonged. And the pipe quality is ensured.

The invention discloses a segmented hybrid symmetric laminated rotor, a preparation method and a motor, the rotor comprises a sub-shaft and a rotor core, the rotor core comprises a plurality of laminated assemblies symmetrically arranged relative to the middle of the rotor core, each laminated assembly is composed of a plurality of laminated individuals arranged in a stacked manner, and the laminated individuals are arranged in the sub-shaft. A plurality of groups of magnetic steel grooves are circumferentially formed in the surfaces of the lamination individuals, the shapes and sizes of the groove tops at the two ends of the magnetic steel grooves located on different lamination assemblies are different, and different magnetic barrier structures are formed between the different magnetic steel grooves and the lamination individuals. The magnetic steel grooves with different shapes are arranged on the lamination assembly, so that the lamination assembly has different magnetic barrier structures, the lamination assembly can form the rotor core of the motor rotor in various combination modes according to use requirements, and when the rotor rotates, torque harmonics with different phases generated by the lamination assembly with different magnetic barrier structures are mutually counteracted, so that the rotor core is more stable and reliable. The torque ripple of the synchronous reluctance motor can be effectively reduced.

The present invention provides a fixing structure that suppresses creep deformation and loosening of a fastening member caused by vibration and improves the fixing holding force. The fixing structure (1) comprises: a stator (2); a housing (3) having an opposing surface (31) opposing the stator (2); and a fixing member (4) fixing the stator (2) and the housing (3), wherein the fixing member (4) comprises an embedded member (5) embedded in the housing (3) and a fastening member (6) fixing the stator (2) to the embedded member (5), wherein the embedded member (5) comprises a supporting surface (55) abutting against the stator (2), wherein at least the supporting surface (55) of the embedded member (5) is formed of a metal material having a damping capacity greater than a specified value, and wherein the supporting surface (55) is located closer to the stator (2) than the opposing surface (31) of the housing (3).

The utility model discloses a detachable folding tuning wrench and relates to the technical field of manual tools. Comprising a ratchet head and a handle connected to the tail end of the ratchet head, the ratchet head comprises a head shell, the ratchet head and a switching assembly matched with the ratchet head are rotationally installed in the head shell, the switching assembly is used for switching the rotating direction of the ratchet head, and the ratchet head coaxially penetrates through a pressing rod. The pressing rod and the ratchet head are in axial sliding fit and circumferential positioning fit, the upper end of the pressing rod upwards protrudes out of the ratchet head, the lower end of the pressing rod downwards extends into the sleeve connector, a round hole is formed in the side wall of the sleeve connector, a positioning ball is arranged in the round hole in a matched mode, and the positioning ball is movably arranged in the round hole in the radial direction. The caliber of an outer port of the circular hole is smaller than the diameter of the positioning ball, and an arc-shaped groove matched with the positioning ball is formed in the pressing rod. According to the utility model, the axial force for disassembling and assembling the sleeve is greatly reduced, and the service life of the wrench is prolonged.

This application discloses an electronically controlled moving chainring mechanism, a shifting system, and a bicycle. The bottom bracket is installed in a cylinder body and is fixed circumferentially to the bushing. The piston is detachably connected to the bushing. When the pedal drives the bottom bracket to rotate, the bottom bracket drives the bushing to rotate, which in turn drives the chainring to rotate. When the freewheel shifts gears, the electronically controlled drive mechanism can actively drive the piston to move axially, and drive the bushing and chainring to adjust their positions synchronously, thereby reducing the angle between the chain, chainring, and freewheel, and improving riding efficiency. Furthermore, the reduced angle expands the meshing range between the chain and the teeth, reducing chain slippage, asymmetrical wear, and axial stress, lowering the risk of tooth deformation, and extending the service life of components. Compared to the traditional passive adjustment method of the chain driving the chainring, this embodiment actively controls the chainring movement through an electronically controlled drive mechanism, resulting in smoother and more precise chainring movement, avoiding jamming, and ensuring stable positioning after reaching the correct position, thus improving riding stability.

The utility model provides a rotor transmission structure and a screw compressor. The rotor comprises a male rotor arranged in an axial rotation mode and a plurality of female rotors arranged around the male rotor, the transmission structure comprises a driving gear, and the driving gear is installed on the shaft section of the male rotor; each driven gear is mounted on the shaft section of each female rotor, so that the plurality of driven gears are arranged around the driving gear and are meshed with the driving gear; and the inner gear ring is arranged around the driven gears and engaged with the driven gears. When the driven gear is meshed with the inner gear ring and the driving gear at the same time, the rotation stability of the driven gear is obviously improved. When the rotor rotates reversely, the reverse contact face of the driven gear can be connected with the inner gear ring or the driving gear more quickly, the response speed of the reverse contact face is earlier than that of tooth face contact generated by reverse movement of the rotor body, and therefore the tooth face collision fault caused by sudden change of the movement direction of the rotor is avoided.

A V-shaped telescopic thrust rod comprises a left telescopic thrust rod body and a right telescopic thrust rod body which are arranged between a frame and a wheel axle in a V shape, the left telescopic thrust rod body and the right telescopic thrust rod body each comprise a thrust cylinder with the two ends closed, the thrust cylinders are installed on the wheel axle through spherical bearings, and thrust cavities are formed in the thrust cylinders; a thrust cavity is formed in the thrust cylinder, a thrust piston is installed in the thrust cavity and divides the thrust cavity into two oil cavities which are independent of each other, hydraulic oil is arranged in the oil cavities, the two ends of the thrust piston are fixedly connected with thrust rod bodies, and the other end of the thrust rod body close to one side of the frame extends out of the thrust cylinder from the thrust cylinder and is connected with the frame through a spherical bearing. The other end, close to one side of the wheel axle, of the thrust rod body extends out of the thrust cylinder from the interior of the thrust cylinder and extends to the outer side of the thrust cylinder. Axial force borne by the dragging arm can be effectively reduced, reasonable amount of motion is provided for the wheel axle, tires and the connecting position of the dragging arm and the frame can be protected, and safety is good.

The utility model provides a counterbalance, a motor rotor assembly and a compressor, the counterbalance comprises a counterbalance main body, the counterbalance main body extends along the circumferential direction of a motor rotor, the counterbalance main body is provided with a windward end and a leeward end, and at least the windward end is provided with a suspended flow guide body extending along the circumferential direction of the motor rotor. A suspended overflowing space is formed between the side, close to the first end face, of the suspended flow guiding body and the first end face, and the suspended flow guiding body is provided with a flow guiding radial outer side face and a flow guiding radial inner side face. The flow guide radial outer side face gradually gets close to the radial inner side of the motor rotor and / or the flow guide radial inner side face gradually gets close to the radial outer side of the motor rotor so that the cross section of the suspended flow guide body can become smaller and smaller in the circumferential direction away from the balance block body. According to the utility model, the internal flow field of the compressor is effectively prevented from being disturbed due to the pumping effect, the operation noise of the compressor is reduced, and meanwhile, the oil spitting rate and oil spitting quantity of exhaust refrigerant of the compressor are reduced.

A method for manufacturing a covered stent includes: disposing an inner covering film (3) on the inside of a stent main body having a mesh structure formed by weaving a wire member, the stent main body having a hooking portion (2b) in which two bent portions of the wire member are hooked to each other; an outer covering film (4) is arranged on the outer side of the stent main body; a relaxation section (6) that bulges in the radial direction of the stent main body is formed on at least one of the membranes (3, 4), and the relaxation section (6) imparts relaxation to at least one of the membranes (3, 4) that permits movement of the two curved sections in the longitudinal direction and the radial direction of the stent main body; and joining the films (3, 4) to each other in the region of the inside of the meshes of the mesh structure.

This invention discloses a pressure-balanced composite sealing ball valve, comprising a valve body, a valve stem, a valve core, and a composite sealing structure. The valve body has a fluid channel and a first mounting hole, which communicates with the fluid channel. At least a portion of the valve stem is connected to the interior of the first mounting hole, and the valve stem can be driven to rotate. The valve core is disposed inside the valve body and is movably fitted with the valve stem. The valve stem has a balance hole, and the valve core has a guide hole, which communicates with the guide hole. The composite sealing structure is fitted around the outer circumference of the valve stem and is sealed to the inner wall of the first mounting hole. When the fluid channel is open, fluid enters the first mounting hole, contacts and forces the composite sealing structure to deform axially on the valve stem. This ball valve employs a composite sealing structure, ensuring a good seal between the valve stem and valve body even under high pressure, high-frequency operation, or the penetration of small molecule media. Simultaneously, the balance hole on the valve stem reduces the operating torque of the valve stem.

The invention discloses pipe jacking equipment capable of reducing the axial bearing capacity of a pipe, the pipe jacking equipment is used for pushing the pipe, the pipe jacking equipment comprises a main jacking part, the pipe jacking equipment further comprises a force transmission sleeve and a shell, the force transmission sleeve is sleeved with the pipe, and the shell and the main jacking part are located at the two ends of the force transmission sleeve respectively; and the shell is detachably connected with the force transmission sleeve. By arranging the force transmission sleeve and the shell, the shell is subjected to pressure from a soil body in the process that the main ejector pushes the pipe, and the force transmission sleeve can bear the pressure from the shell through connection of the shell and the force transmission sleeve. The pipe is arranged on the force transmission sleeve in a sleeving mode, and the main ejector exerts ejecting force on the pipe, so that the pipe is pushed by overcoming frictional resistance from a soil body. Through the arrangement, the axial force needing to be borne by the pipe in the pipe jacking construction process is reduced, so that the defect that the low-bearing-capacity pipe can only be used for excavation and pipe burying construction is overcome, and the low-bearing-capacity pipe can be used for pipe jacking construction.

The utility model relates to a shell partition plate and an engine-transmission-assembly, the shell partition plate is provided with a bearing seat, the bearing seat is used for axially and radially supporting a helical tooth type gear, the gear is connected with an intermediate shaft in an anti-torque mode and is meshed with a driven gear, and the driven gear is also provided with helical teeth. Wherein the bearing seat is spaced from at least one through hole in the shell partition plate. In order to improve the service life of the housing partition during operation, the bearing block has a disc-shaped load surface which is surrounded by a cylindrical outer-cover-shaped radial bearing body which is integrally connected to an umbrella-shaped reinforcing structure in a peripheral region facing away from the disc-shaped load surface, an umbrella-shaped reinforcing structure connects the radial bearing body in a force-transmittable manner to a diaphragm body surrounding the bearing block radially outside, such that the stiffness of the housing diaphragm is effectively increased in a critical region between the bearing block and the through-hole when an axial force acts on the disc-shaped load surface during normal operation.

The utility model discloses a centrifugal impeller and fan structure capable of simultaneously reducing axial force and leakage rate, the centrifugal impeller comprises a wheel disc, a plurality of main blades are uniformly arranged on the front surface of the wheel disc, and a plurality of binary auxiliary blades are uniformly arranged on the back surface of the wheel disc. The rotating directions of the main blades and the binary auxiliary blades are arranged in the pressure increasing direction, the structure that the binary auxiliary blades are arranged on the back face of the impeller is adopted, when the impeller rotates, the auxiliary blades drive air on the back face of the wheel disc to do centrifugal motion, and the vacuum effect is formed on the back face of the wheel disc. On one hand, the air quantity leaked from the shaft end sealing structure by the impeller can be greatly reduced, and on the other hand, the axial force is greatly reduced, the load of a thrust bearing is reduced, and the mechanical loss is reduced; according to the two advantages, the overall efficiency of the compressor is improved, and the operation cost of a unit is saved.

The invention relates to the technical field of spiral corrugated pipes, in particular to a high-toughness polyethylene spiral corrugated pipe which comprises a son end, a pipe body and a mother end and further comprises a cavity, a buckle, a clamping ring, an extending mechanism, a containing mechanism, an upper clamping plate, an upper clamping groove, a lower clamping plate, a lower clamping groove and a connecting mechanism. The clamping buckle is installed in the female end, the upper clamping plate and the lower clamping plate are matched with the upper clamping groove and the lower clamping groove respectively, the connecting mechanism is connected with the upper clamping plate and the lower clamping plate, and when the clamping ring extrudes the clamping buckle, the stretching-in mechanism is matched with the containing mechanism and drives the upper clamping plate and the lower clamping plate to enter the upper clamping groove and the lower clamping groove respectively. After the upper clamping plate and the lower clamping plate enter the upper clamping groove and the lower clamping groove correspondingly, the connecting mechanism controls the upper clamping plate and the lower clamping plate to extrude the mother end to the son end, the sealing ring controls the limiting block to rotate in the limiting groove to connect the son end with the mother end, the connecting strength of the son end and the mother end can be improved, and the son end and the mother end are prevented from being separated.

The invention relates to a fire pump for a fire truck, and provides an electric high-low pressure fire pump for a fire truck in order to solve the technical problems that an existing fire pump for the fire truck is large in noise, low in fire extinguishing efficiency and unstable in rotating speed and power matching, and the flow and pressure performance of the fire pump cannot be fully exerted. Comprising a driving motor, a water inlet pipe, a low-pressure impeller assembly, a high-pressure impeller assembly, a high-pressure water inlet section and a driving connecting section, a high-low pressure sealing support is arranged between the low-pressure impeller assembly and the high-pressure impeller assembly. A high-low pressure switching pipe is arranged between the input end of the low-pressure impeller assembly and the input end of the high-pressure water inlet section, and a high-low pressure switching valve is arranged in the middle of the high-low pressure switching pipe. A water throwing ring matched with the driving shaft in diameter is arranged between the driving connecting section and the high-pressure water inlet section; a mechanical sealing device matched with the high-pressure water inlet section is further arranged on the connecting end face of the high-pressure water inlet section and the driving shaft of the driving motor.

The invention discloses a sensing actuation integrated type longitudinal bending composite ultrasonic drilling cutter handle, and belongs to the technical field of ultrasonic auxiliary machining. The problems that a traditional ultrasonic drilling cutter handle amplitude measurement external sensor is difficult to arrange, and amplitude sensing based on electrical parameter feedback is prone to being interfered by internal electric signals of a power source, so that the amplitude sensing precision is low are solved. The sensing actuation integrated longitudinal bending composite ultrasonic drilling cutter handle comprises a rear end cover 1, a sensing actuation piezoelectric ceramic group 2, an insulating layer 3, a thermal expansion cutter handle 4 and a drilling and milling cutter 5. Longitudinal vibration and bending vibration sensing ceramics are innovatively implanted into the cutter body, so that precise in-situ sensing of ultrasonic amplitudes of longitudinal vibration and bending vibration can be realized; meanwhile, by applying longitudinal vibration and bending vibration excitation signals, simultaneous excitation of a longitudinal vibration mode and a bending vibration mode can be achieved, so that the drilling and milling tool nose outputs an elliptical track, and the longitudinal bending ultrasonic drilling tool handle can achieve the axial ironing and impact machining effect and the intermittent cutting effect in the cutting direction at the same time in the drilling process; and the drilling precision and the processing performance of difficult-to-process materials are improved. According to the design, integration of sensing and actuating functions of the cutter handle is ingeniously achieved, the structure of the cutter handle is simplified, the machining precision is improved, and the application scene is expanded.

The invention belongs to the field of optical medical equipment, and relates to an OCT (optical coherence tomography) imaging catheter connecting device and method.The OCT imaging catheter connecting device comprises a base, a guiding assembly and a driving assembly; the guiding assembly and the driving assembly are installed on the base. The guide assembly comprises a catheter seat used for fixing an OCT catheter, an adapter fixing seat used for fixing the SC adapter assembly, a slip ring mounting seat used for fixing an optical fiber slip ring, and a guide rod or a guide rail used for enabling the slip ring mounting seat, the adapter fixing seat and the catheter seat to build linear axial movement; the driving assembly comprises a stepping motor, a lead screw nut and a lead screw. The outer end of the lead screw nut is fixed on the adapter fixing seat through a pin rod; the center of the lead screw nut is sleeved at the front end of the lead screw through a threaded hole; the rear end of the lead screw is in transmission connection with the stepping motor, and the front end of the lead screw penetrates through the adapter fixing base. The stepping motor and the lead screw drive the lead screw nut to move front and back, so that the adapter fixing base is pushed to be close to or away from the catheter base, and stable butt joint of the OCT catheter connecting device and the catheter is achieved.

The utility model discloses a rear module framework suitable for a PHEV chassis, the chassis and a vehicle. The rear module framework of the chassis comprises a rear auxiliary frame, and reinforcing ribs in bilateral symmetry are arranged on cross beams and longitudinal beams of the rear auxiliary frame; bushings are arranged at the positions of four connecting joints of the rear auxiliary frame and a vehicle body, three suspension supports are arranged on the rear auxiliary frame, the three suspension supports are of hollow structures, and flanges are arranged at the edge positions of the three suspension supports. According to the rear auxiliary frame, the suspension supports of the rear auxiliary frame are optimized, the three suspension supports are hollowed out and flanged, the weight is reduced, the rigidity is improved, and meanwhile reinforcing ribs are arranged on the suspension supports to guarantee the strength of the rear auxiliary frame.

This invention relates to the field of testing equipment technology and provides an airtightness testing device, including an airtightness detector, an air intake assembly, and an elastic sealing plug. The air intake assembly includes a hollow air intake pipe and a support base. One end of the air intake pipe is fixedly connected to the support base, and the other end is provided with an external interface for connecting an external airtightness detector. The support base has a through-hole for connecting the air intake pipe and a cavity. The sealing plug includes an arcuate portion adapted to a narrow throat, a first limiting portion, and a second limiting portion. The sealing plug has a through-hole for the air intake pipe to pass through. The through-hole is located on the inner wall of the first limiting portion, which is recessed inward to form an abutment groove for restricting the movement of the support base. In this invention, the airtightness testing device has a simple structure, is quick to install and disassemble, ensures the reliability of liquid-fueled rocket engine quality, effectively improves the efficiency of liquid-fueled rocket assembly and testing, and shortens the preparation time before rocket launch.

The invention discloses a large-span overhanging ridgeline reverse curved double-slope diamond lattice shell system adapting to high drop, comprising a roof structure, a concrete structure and a vertical member connecting the roof structure and the concrete structure; the roof structure is in the form of a single-ridge reverse curved double-slope structure, which extends perpendicularly to the ridgeline direction to the building boundary end as a low zone; the vertical member comprises a first lateral resistance member arranged in the low zone of the roof structure, a second lateral resistance member and an internal vertical steel column arranged inside the roof structure, and a peripheral vertical steel column arranged along the outer contour of the roof structure; the first lateral resistance member comprises an inter-column support column arranged in the corner area of ​​the roof structure, a horizontal brace connected between adjacent inter-column support columns, a cross diagonal brace connected between the inter-column support columns and located at the upper and lower parts of the inter-column support columns, and a parallel diagonal brace connected between the inter-column support columns and located in the middle area of ​​the inter-column support columns. The present application has the advantages of stable structure, convenient construction and low cost.

The invention discloses an elbow ceramic ball bipolar jaw assembly. The elbow ceramic ball bipolar jaw assembly comprises a lower jaw assembly (1); an upper jaw assembly (2); a sliding pin (3); a fixing pin (4); a sleeve (5); the lower jaw assembly (1) is a fixed jaw, and the upper jaw assembly (2) is a movable jaw; opening and closing of the upper jaw assembly (2) are controlled through a sliding pin (3), the sliding pin (3) is located in a groove (201), the included angle between the axis of the groove (201) and the horizontal plane is divided into two parts, and the included angle of the part close to the jaw tip end is larger than the included angle of the part away from the jaw tip end. The ceramic ball is fixedly arranged through the metal jaw sealing plate, a reasonable gap of the jaw sealing plate can be kept, the machining process is simple, and the structure is reliable. In addition, through the sectional type sliding pin groove included angle design, the jaw can be rapidly opened, and meanwhile the jaw transmits small axial force to the trigger when the jaw is closed.

The present invention relates to a pump casing capable of balancing the axial force of a centrifugal pump, comprising a pump casing, wherein a plurality of arc-shaped convex blocks are installed on the inner surface of the front pump chamber of the pump casing facing the impeller front cover plate, wherein the cross-sectional contour line of the arc-shaped convex block is a smooth convex curve, wherein the top of the convex area of ​​the smooth convex curve is an arc line parallel to the generatrix of the impeller front cover plate, and a gap is left between the top of the convex area of ​​the arc-shaped convex block and the impeller front cover plate. The pump casing of the present invention can ensure that the axial force is stably reduced throughout the life cycle of the pump.

This application discloses a direct-drive chainring mechanism and a bicycle. By placing a linear motor between the frame and the bottom bracket, and fitting the motor rotor onto the bottom bracket to allow it to move axially along the bottom bracket, and connecting a bushing fitted onto the bottom bracket to the motor rotor, the chainring can be moved synchronously along the bottom bracket axially by controlling the working state of the motor stator. This adjusts the angle between the chainring and the chain, reducing the deviation of the angle from the ideal zero degree, decreasing the axial component force generated by the angle when the chain transmits driving force, increasing the effective power to drive the freewheel, and ultimately improving riding efficiency. This embodiment of the application provides a reliable path for optimizing the power transmission efficiency of a multi-speed bicycle by utilizing the linkage mechanism between the linear motor and the chainring. Furthermore, because the angle is smaller, the meshing range between the chain and the teeth is wider, reducing chain slippage, asymmetrical wear of the teeth, and axial force on the teeth.

The invention discloses an air compressor and an axial force adjusting method thereof, a fuel cell system and a vehicle, the air compressor comprises a machine body, a pressurization mechanism and a sealing mechanism, the sealing mechanism comprises a first sealing assembly and a second sealing assembly which are both installed on a rotating shaft, the first sealing assembly is connected with the side, close to a second impeller, of a first impeller, and the second sealing assembly is connected with a second impeller. A first sealing channel communicating with the first volute is arranged between the first sealing assembly and the first impeller. The second sealing assembly is connected with the side, close to the first impeller, of the second impeller, and a second sealing channel communicating with the second volute is arranged between the second sealing assembly and the first impeller. The second sealing assembly is provided with a bypass sealing channel communicating with the second sealing channel and an adjusting assembly used for adjusting the opening degree of a communicating opening between the bypass sealing channel and the second sealing channel. The opening degree of the communicating opening is adjusted through the adjusting assembly, axial force balance of the air compressor within the full rotating speed range is achieved, and the safety performance and efficiency of the thrust bearing are improved.

The air conditioner comprises a machine shell, a heat exchanger assembly, an air duct assembly and a driving assembly, and the machine shell is provided with an air inlet and an air outlet; the opening and closing door is movably arranged on the machine shell so as to open and close the air outlet. The driving assembly is arranged in the machine shell and comprises a driving mechanism used for driving the opening and closing door to move, the driving mechanism comprises a driving motor and a transmission mechanism, and the transmission mechanism is in transmission connection with a motor shaft of the driving motor and the opening and closing door and comprises a transmission gear and a transmission rack which are meshed. The transmission gear is meshed with the transmission rack in a herringbone tooth meshing mode. According to the air conditioner, the meshing gap between the transmission gear and the transmission rack is small, noise is low, axial force is small, meshing between the transmission gear and the transmission rack is more stable, low noise and low vibration of the driving mechanism are achieved, the transmission mechanism can conduct transmission stably, and therefore the driving mechanism drives the opening and closing door to operate stably.

The utility model provides a gearbox gear, which relates to the field of gears, and comprises a gear body, gear teeth distributed on the circumference of the excircle surface of the gear body at equal angles, and a tooth groove between every two adjacent gear teeth. A first annular groove is formed in the end face of one side of the gear body, a baffle is elastically connected to the first annular groove, a plurality of springs are arranged at the bottoms of the baffle and the first annular groove, a bearing hole is formed in the center of the gear body, and the center lines of the bearing hole, the dog tooth shaft and the gear tooth body coincide. The first annular groove is formed in the end face of the side, close to the dog teeth, of the gear body, the baffle is elastically connected into the first annular groove, and in the process that the gear shifting fork is manually shifted to drive the sleeve to be meshed with the dog teeth, axial force of the sleeve to the gear is reduced, and the stability of the gear is protected.

This utility model discloses a high-pressure water braid for coal mine drilling, comprising a fixed body, a rotating body, and bearings arranged coaxially. The fixed body includes a protective shell, an end cap, a high-pressure seal, an O-ring, and a lubricator. The top of the protective shell is fixed to the end cap by threads, and a high-pressure seal is provided at the bottom of the protective shell. The O-ring is installed inside the end cap, and the lubricator is installed on the end cap. The rotating body includes an inner shaft and a bearing support pad. The bearings include rolling bearings and flat bearings. The inner shaft is located inside the protective shell and extends through the end cap. The middle part of the inner shaft is installed to the protective shell through rolling bearings and flat bearings. It adopts a split design, and the fixed body and the rotating body are connected by bearings. This allows the fixed body and the rotating body to rotate relative to each other while slightly moving relative to each other in the axial direction of the inner shaft, thereby compressing the internal oil injection cavity and generating reverse pressure, thus reducing the axial force on the bearing and achieving flexible rotation under high pressure conditions.

The invention provides a solid-phase repair tool and method for defects of a thin-wall component, and relates to the technical field of material processing and manufacturing. The repairing tool comprises a disc base body which is provided with a center installation hole and can be installed with a rotating shaft through a transmission key groove, a repairing area is arranged on the periphery of the disc base body, grooves are formed in the surface of the repairing area at intervals, and the repairing area is used for rotating and pre-pressing the thin-wall component and repairing the thin-wall component in cooperation with a repairing material; finishing areas are arranged on the two sides of the repairing area, and forward finishing blades and reverse finishing blades are sequentially and evenly arranged on the peripheries of the finishing areas. The repairing method comprises the steps that the defects of the thin-wall component are milled, the thin-wall component and a repairing material are clamped, reciprocating friction rolling solid-phase repairing is carried out, a repairing area is finished, finally, material allowance is slightly removed through finish machining, and the high-quality thin-wall component is obtained. The method is low in repair cost and less in material waste, repair and finishing operations are carried out simultaneously by the repair tool, and the performance and the service life of the thin-wall component are improved.