1196 results about "Tooth part" patented technology

A foldable apparatus (10, 20) and an electronic device (100) including the foldable apparatus are disclosed. The foldable apparatus includes a first support plate (11), a middle support plate (12), a second support plate (13), a main shaft (14), a first gear connecting rod (15), and a second gear connecting rod (16). A first tooth part (121) and a second tooth part (122) on the middle support plate are respectively meshed with a first gear (151) on the first gear connecting rod and a second gear (161) on the second gear connecting rod, so that the middle support plate slides relative to the main shaft.

The utility model discloses a rotary compressor and refrigeration equipment, and relates to the technical field of compressors, the rotary compressor comprises a motor, the motor comprises a stator and a rotor, the stator comprises a stator iron core and a stator winding, the stator iron core comprises an annular yoke part and a plurality of tooth parts arranged in the yoke part, the plurality of tooth parts are spaced along the circumferential direction of the yoke part, and the stator winding is arranged in the yoke part; a stator groove is formed between every two adjacent tooth parts, the stator winding is wound in the stator grooves, and the rotor comprises a rotor iron core; the pump body part comprises a crankshaft, an upper bearing and a cylinder; the number of the stator grooves is Q, the number of poles of the rotor is P, the maximum outer circle contour radius of the rotor core is R1, the maximum outer circle contour outer diameter is D1, D1 = 2 * R1, the outer diameter of the part, matched with the upper bearing, of the crankshaft is D2, GCD (Q, P) is the largest common divisor of Q and P, and GCD (Q, P) is larger than or equal to # imgabs0 # 5 and smaller than or equal to 6. The rotary compressor disclosed by the utility model is beneficial to improving the energy efficiency of the rotary compressor and reducing the electric energy consumption during operation.

The present invention discloses a massage comb, which includes a housing, a turntable, a plurality of first comb tooth parts, a driving mechanism and a functional module. The housing includes a comb handle and a comb head connected to the comb handle, and an installation part is provided on the comb head; the turntable is rotatably installed on the comb head; the plurality of first comb tooth parts are movably installed on the comb head and connected to the turntable; the driving mechanism is installed in the housing and connected to the turntable to drive the turntable to rotate, so as to drive the ends of the plurality of first comb tooth parts away from the turntable to move inwards or outwards; the functional module is installed on the installation part, and the plurality of first comb tooth parts surround the outer periphery of the functional module. Since the ends of the first comb tooth parts away from the turntable swing inwards or outwards relative to the comb head, compared with the way of rotating circumferentially around the comb head, the risk of the massage comb winding hair around the first comb tooth parts can be reduced, so that the massage comb is suitable not only for users with short hair, but also for users with long hair, and has a wider scope of application.

The invention belongs to the field of rock-soil drilling equipment, and discloses a highway construction rock drilling sampling device which comprises a rack, a sampling device and a sampling device, the drill rod assembly is arranged on the rack and comprises an inner shaft rod and an outer sleeve rod, and the inner shaft rod is rotationally sleeved with the outer sleeve rod; the first driving mechanism at least drives the outer sleeve rod to rotate; and the drill bit assembly is connected with the drill rod assembly. Through the drill rod assembly and the drill bit assembly, a sampling component and a drilling component of the drill bit assembly are matched with a limiting tooth part through a movable ratchet assembly, state switching of the sampling component and the drilling component can be achieved, and when the drilling component is reversely screwed out after drilling, a movable tightening piece can be driven to move by rotating relative to the sampling component; and the movable tightening part of the sampling component can tighten and clamp the sample, so that the friction force in the sampling process can be increased, the sample is not easy to fall off, the structure is simpler, and the operation is easy.

The invention discloses a raw material mixing device for preparing a fluorescent material for backlight display and a preparation method. The raw material mixing device comprises a mixing cylinder, a feeding port is formed in the top of the mixing cylinder, an annular supporting frame is further arranged at the top of the mixing cylinder, a plurality of sets of raw material cylinders are evenly arranged on the peripheral side of the annular supporting frame, and an annular base is rotationally arranged in the annular supporting frame; a plurality of groups of arc-shaped areas are arranged on the annular base, and a material receiving box is arranged in each group of arc-shaped areas; a discharging port is formed in the bottom of the mixing barrel, a rotating shaft is rotationally arranged in the mixing barrel, the bottom end of the rotating shaft extends to the position below the discharging port and is provided with a discharging gear, and an auger is arranged on the part, located in the discharging port, of the rotating shaft; arc-shaped tooth parts used for being meshed with the discharging gear are arranged at the positions, located in the arc-shaped areas, of the inner ring plate, each arc-shaped tooth part is composed of multiple sets of tooth part units, each set of tooth part units are independently arranged on the inner ring plate in a vertical sliding mode, and a driving assembly for driving each set of tooth part units to slide is arranged on the annular base; the raw materials can be automatically fed into the mixing cylinder for stirring according to the reverse rotation of the motor in proportion.

The invention discloses a manufacturing method of a frameless torque motor stator core, the stator core comprises a stator yoke part, a stator tooth part and a stator coil, the stator yoke part is in a circular ring shape, the stator tooth part is in a sun tooth type structure, the stator tooth part comprises a circular ring part, a tooth boot part and a tooth body part, the stator tooth part is embedded in the stator yoke part, and the tooth body part is in a sun tooth type structure. The plurality of tooth body parts are uniformly distributed, high-temperature-resistant insulating films are prepared on the surfaces of the stator yoke part and the stator tooth parts, and the stator coils are arranged on the peripheral sides of the tooth body parts in a sleeving manner; the manufacturing method comprises the following steps: S100, manufacturing the stator yoke part and the stator tooth part, and carrying out coating treatment; s200, winding to form a stator coil; s300, assembling a stator iron core; s400, welding a wire pin; s500, pouring glue and drying; s600, boring and shaping: boring the inner side of the circular ring part and the solidified potting glue, and boring off the circular ring part, so that two adjacent tooth shoe parts are completely isolated, and the closed slot of the stator core is bored to form an open slot; and S700, carrying out performance detection.

The invention discloses an ultrasonic welding head, a tab, an electrode assembly, a single battery, a battery and a power utilization device.The ultrasonic welding head comprises a welding head body and first welding teeth, the welding head body is provided with a welding face, the first welding teeth are arranged on the welding face in a protruding mode, and each first welding tooth comprises a plurality of tooth parts; the multiple tooth parts are the first tooth part and the mth tooth part which are sequentially arranged in the protruding direction of the first welding tooth, the nth tooth part is arranged on the end face of the end, away from the welding face, of the (n-1) th tooth part, the end face of the end, away from the welding face, of the (n-1) th tooth part exceeds the nth tooth part, and n is larger than or equal to 2 and smaller than or equal to m. The ultrasonic welding head can reliably weld corresponding parts of the battery monomer, and the service reliability of the battery monomer is improved.

The invention discloses a flexible gear with a stable structure, and belongs to the technical field of harmonic reducers. The flexible gear comprises a tubular cylinder with a first end and a second end, and a wave generator enters the cylinder from the first end; the tooth part is arranged on the periphery of the cylinder body, the tooth part comprises a plurality of outer teeth, the outer teeth are evenly distributed in the circumferential direction of the cylinder body, each outer tooth is provided with a first transition inclined face, each first transition inclined face is provided with a low end and a high end, and the low end of each first transition inclined face is flush with the first end of the cylinder body. The technical problem that an existing flexible gear structure is low in stability is solved.

The invention discloses a stator assembly, a compressor and refrigeration equipment, and relates to the technical field of motors. The stator assembly comprises a stator core formed by stacking a plurality of amorphous alloy sheets, the stator core comprises a yoke part, a tooth part and a shoe part, and the stator core is formed by stacking a plurality of amorphous alloy sheets, so that the iron loss of the stator assembly can be reduced. For a motor, the area of a stator slot is expected to be as large as possible to increase the winding wire diameter so as to reduce copper loss, and the smaller the minimum width of a tooth part is, the better is, but the smaller the width of the tooth part is, the more likely to cause magnetic field saturation. In order to reasonably design the minimum tooth width of the tooth part so as to reduce the problem of magnetic voltage drop increase caused by magnetic field saturation, the minimum tooth width Wt of the tooth part is set in a range of 2piD / 9Q to 2piD / 3Q, so that the area of the stator slot can be effectively increased, the problem of magnetic voltage drop increase caused by magnetic field saturation can be improved, the magnitude of current can be reduced, and the service life of the stator slot can be prolonged. The working efficiency of the motor is improved.

The utility model discloses an occlusion type expansion sleeve which comprises a cylindrical sleeve body formed by rolling a plate body, the upper portion of the sleeve body is provided with a long-strip-shaped notch penetrating through the top of the sleeve body, and the upper portion of the sleeve body is divided into a plurality of expansion parts through the long-strip-shaped notch. When the sleeve body is unfolded into a plate body, a first meshing tooth part and a second meshing tooth part are arranged on the two sides of the lower portion of the sleeve body respectively. When the plate body is rolled into the sleeve body, the first meshing tooth part and the second meshing tooth part are meshed and clamped; and barbs and stamping grooves are arranged on the sleeve body. By arranging the first meshing tooth part and the second meshing tooth part, the structural strength of the splicing position of the sleeve body can be improved, and the cracking risk of the splicing position of the sleeve body is reduced; by arranging the barbs, the friction force between the sleeve body and the mounting hole can be increased, the sleeve body is prevented from idling, meanwhile, the barbs can prevent the sleeve body from being separated from the mounting hole, and the fixing effect of the sleeve body is improved; and by forming the stamping groove, the structural strength of the expansion part can be improved, and the structural strength of the sleeve body can be improved.

The invention discloses a stator structure with separated tooth and yoke parts and a processing method thereof, the stator structure comprises a stator core and a stator winding, the stator core comprises a stator outer core and a stator inner core, a stator tooth part is formed on the stator inner core, a stator yoke part is formed on the stator outer core, and the stator winding is arranged on the stator outer core. Therefore, the stator tooth part and the stator yoke part of the stator core are separated. The processing method comprises a stator outer iron core processing method, a stator inner iron core processing method and a stator winding assembling method. According to the invention, a special stator structure form with separated tooth and yoke parts is adopted, so that the problem of a W-pin winding wire embedding process is solved; magnetic field distribution can be optimized through different notch structure forms, and the vibration and noise problems caused by electromagnetic force generated in the operation process of the motor to the new energy automobile are reduced; the sectional area of a copper wire is increased through different groove type design, and the motor operation efficiency is improved; and through a rotary bonding mode, the material cost is reduced, and the loss caused by welding and riveting is reduced.

The utility model discloses an axial magnetic flux disc type motor stator iron core with an insulation structure and a disc type motor, comprising a stator iron core and insulation frameworks, each inner groove insulation framework comprises a left side wall, a right side wall, an inner baffle plate, an upper baffle plate and a bottom baffle plate, one end of the left side wall and one end of the right side wall are respectively connected with two sides of the inner baffle plate to form a V-shaped layout, the inner slot insulation framework is sleeved on the tooth part by taking the tooth part of the stator core as a reference; each outer groove insulation framework comprises two outer baffle plates and a groove insulation part which radially protrudes inwards from the position between the two outer baffle plates, the outer groove insulation framework takes a wire embedding groove of the stator iron core as a reference, the groove insulation part is embedded into the wire embedding groove to insulate the outer end of the wire embedding groove, and the outer baffle plates are attached to the outer side wall of the tooth part; the structure can be applied to an open slot, a closed slot or a semi-closed slot, the inner slot insulation framework and the outer slot insulation framework form nesting and have an interlocking function, it is guaranteed that the whole framework cannot move, the technology is simple, installation is convenient, the creepage distance is easy to guarantee, and reliability is greatly improved.

The invention discloses a formed milling cutter tool system for machining a jaw and a machining method. The formed milling cutter tool system comprises a formed milling cutter. The forming milling cutter comprises a milling cutter disc body, a cutter shaft mounting hole formed in the position of the central axis of the milling cutter disc body, a plurality of composite-shape cutting teeth arranged on the outer circle of the milling cutter disc body and arranged at intervals in the circumferential direction, and tooth grooves formed between every two adjacent composite-shape cutting teeth in the circumferential direction. The composite-shaped cutting teeth are provided with shovel rear angles in the circumferential direction. Each composite-shape cutting tooth comprises a main cutting tooth part, a transition cutting tooth part and an auxiliary cutting tooth part which are adjacently connected in the axial direction, and each main cutting tooth part comprises a section of sawtooth-shaped dense teeth, a section of sawtooth-shaped comb teeth and a section of linear teeth which are adjacently connected in sequence in the axial direction; a special milling cutter for dense tooth part machining and a dense tooth part on-line strong cold abrasion monitor are further arranged in a matched mode. The invention provides a systematic solution integrating a special cutter, online wear monitoring and auxiliary forced cooling.

The invention discloses a rapid punch forming process and die based on multiple stations. The die comprises a workbench, an upper die, a lower die, a driving assembly and a combined driving mechanism. The air cylinder drives the lower die to ascend and descend and suck blanks in a vacuum mode, the motor drives the upper die to conduct stamping, the dies are locked during stamping and accurately rotate by 90 degrees to switch stations during resetting by means of differential meshing of a groove and a plane of a tooth part, and finished products fall into a collecting box after being demolded through gravity. The problems of insufficient station switching precision, action interference and low automation degree of a traditional multi-station mold are solved, full-process automatic linkage of adsorption, punching, rotation and demolding is achieved through cooperation of pneumatic and magnetic attraction assemblies, and manual intervention is avoided. The four-station continuous punching machine has the characteristics of four-station continuous machining, motion interlocking interference prevention, accurate positioning, high efficiency and stability, the mass production efficiency and the finished product percent of pass are remarkably improved, and the four-station continuous punching machine is suitable for high-speed punching forming in the fields of automobile parts, electronic elements and the like.

The utility model discloses a clamping device and a reinforcing steel bar threading machine, relates to the field of construction machinery, solves the problem of reinforcing steel bar alignment, and adopts the technical scheme that the clamping device comprises a clamping mechanism and a driving mechanism; the clamping mechanism comprises a bench clamp; a clamping assembly is arranged on the bench clamp; the clamping assembly comprises a tooth seat and a plurality of tooth parts; the plurality of tooth parts are arranged on the tooth seat at intervals; the tooth part comprises a plurality of teeth; arc-shaped notches are formed in the teeth; the teeth are vertically arranged; the bench clamp comprises a first bench clamp and a second bench clamp; the first bench clamp and the second bench clamp are oppositely arranged; teeth on the first bench clamp and the second bench clamp are opposite in a staggered manner; the first bench clamp and the second bench clamp can be close to each other or away from each other; the first bench clamp and the second bench clamp are driven by a driving mechanism to get close to or away from each other. The purpose of automatically aligning the axes of the steel bars in the clamping process is achieved.

A clutch device includes: an input disk; an output disk; and a biasing member configured to press the input disk and the output disk against each other, the input disk and the output disk contact or separate from each other in an axial direction, and at opposing surfaces thereof, respectively have tooth portions engageable with or disengageable from each other, at each tooth portion, recessed and raised portions extending in a radial direction are alternately provided in a circumferential direction, each of the recessed and raised portions is formed so that a width in the circumferential direction may outwardly expands in the radial direction, and engagement force in the axial direction is greater on an inside of the tooth portions in the radial direction than on the outside when the tooth portions of the input disk and the output disk pressed by the biasing member are fitted in each other.

The utility model discloses a liquid cooling plate which comprises a cover plate, a base plate and at least one first relieving tooth unit arranged on the side, close to the base plate, of the cover plate. The first form relieved tooth unit comprises a plurality of first form relieved teeth, and a gap is formed between every two adjacent first form relieved teeth; the at least one second relieving tooth unit is arranged on one side, close to the cover plate, of the base plate; the second form relieved tooth unit comprises a plurality of second form relieved teeth; when the cover plate and the base plate are buckled, the second form relieved tooth units are engaged with the first form relieved tooth units, so that the second form relieved tooth parts are located in the gaps, and the first form relieved teeth and the second form relieved teeth are alternately arranged; according to the liquid cooling plate, a new form relieved tooth structure is additionally arranged on the substrate, so that the second form relieved teeth and the first form relieved teeth are meshed and alternately arranged after the cover plate and the substrate are buckled, the surface area density of the form relieved teeth is increased, the contact area and the heat conduction path are increased, and the heat dissipation efficiency is improved on the premise that the overall size of an original liquid cooling plate is not changed; and the application range of the liquid cooling plate is ensured.

The invention provides an invisible orthodontic appliance assembly and a mounting method and application thereof, the invisible orthodontic appliance assembly is used for treating twisted teeth, and the invisible orthodontic appliance assembly comprises an invisible orthodontic tooth socket at least comprising a twisted tooth part, a first adjacent tooth part and a second adjacent tooth part; a local grinding area is arranged at the torsion tooth part, and the surface of the torsion tooth is exposed; the torsion tooth correction assembly comprises a self-ligating bracket, a first arch tube, a second arch tube and an arch wire, wherein the self-ligating bracket is fixed on the surface of a torsion tooth; the first arch tube is arranged on the surface of the first adjacent tooth part, and the second arch tube is arranged on the surface of the second adjacent tooth part; the arch wire comprises a fixed end and a free end, the fixed end is fixed in the first arch tube, and the free end is accommodated in the second arch tube; the middle part of the arch wire is fixed in the self-ligating bracket to form a locking state, and the resilience force generated by the deformed arch wire is used for correcting the twisted teeth. Through the synergistic effect of the invisible orthodontic tooth socket, the self-ligating bracket, the arch tube and the arch wire, efficient orthodontic of twisted teeth is realized.

The utility model discloses a floor brush component and cleaning device relates to cleaning device technical field, the floor brush component includes shell, roll brush and comb tooth structure, the interior of shell is provided with roll brush cavity, roll brush is rotatablely provided in roll brush cavity, roll brush includes roll body and a plurality of brush strip, brush strip is connected to roll body's peripheral wall and is arranged along the radial direction of roll body, the roll body is equipped with the comb tooth structure, and the roll body is equipped with the comb tooth structure. The multiple brush strips are arranged at intervals in the axial direction of the roller body, the comb tooth structure comprises multiple first tooth parts arranged at intervals in the axial direction of the roller body, the first tooth parts are formed on the inner wall of the rolling brush cavity in a protruding mode, a groove is defined between every two adjacent first tooth parts, a protruding part is arranged on one side of each first tooth part, and the clamping grooves and the grooves are sequentially arranged in the rotating direction of the rolling brush. When the rolling brush rotates, the brush strip sequentially passes through the clamping groove and the groove, the clamping groove can hook hair wound on the brush strip, and the rolling brush is cleaned.

The utility model relates to a disc type axial motor, comprising a rotor which comprises a rotor iron core and magnets which are respectively arranged on the front side surface and the rear side surface of the rotor iron core and are arranged along the circumferential direction of the rotor iron core; the stator comprises a stator iron core, a tooth part which is arranged on one side surface of the stator iron core and is arranged along the circumferential direction of the chassis, and a coil which is arranged on the tooth part; the two stators are arranged on the front side and the rear side of the rotor respectively, and the tooth parts face the rotor. According to the disc type axial motor provided by the utility model, through the stator-rotor-stator design, the magnetic field of the motor is optimized, the energy density is high, and the rated torque can reach 2.3 Nm in a motor with the diameter of 90mm. And the effects of reducing the size and increasing the energy density are achieved, and the market requirement of the robot is met.

The utility model relates to a cleaning equipment brush head, cleaning equipment and a cleaning system. The cleaning equipment brush head comprises a main body part; the rolling brush is arranged on the main body part and can rotate relative to the main body part; the comb teeth are installed on the main body part, each comb tooth comprises a plurality of tooth parts arranged in the first direction, and a first acute angle is formed between the extending direction of at least part of the tooth parts and the first direction; wherein the first direction is the axis direction of the rolling brush. The brush head of the cleaning equipment has better anti-winding capability.

The invention relates to a double-rotor joint motor, which belongs to the technical field of motors, and comprises a base assembly, a rotor assembly, a rotor assembly, a rotor assembly, a rotor assembly, a rotor assembly and a rotor assembly, wherein the base assembly comprises a main shaft, a main shaft end seat and a fixed tooth seat; the output component is formed by connecting an output tooth holder and an output end cover with a magnetic ring, and the main shaft end seat is arranged in the output tooth holder; the middle shaft assembly comprises a middle tooth holder and an inner side middle tooth part; the pair of core motor assemblies is sleeved on the main shaft and comprises a rotor with a containing groove and an inserting shaft, a stator sleeved on the inserting shaft and a flexible gear arranged on the periphery of the stator and provided with an annular groove, the tooth portion of the flexible gear is meshed with teeth of the fixed tooth holder, the middle tooth holder and the output tooth holder, and a roller matched with the annular groove of the flexible gear is arranged on the periphery of the stator. The joint motor adopts a double-rotor and harmonic reducer structure, and the double rotors reversely operate at a constant speed, so that the inertia moment is counteracted, and the influence of rotor motion on output motion is reduced.

The invention relates to the technical field of precision transmission and robot joints, and particularly discloses a sensor integrated intelligent harmonic reducer and a flexible robot joint system.The sensor integrated intelligent harmonic reducer comprises a rotating shaft, a wave generator, a flexible wheel assembly, a steel wheel assembly, a bearing pack and an integrated sensor module; the rotating shaft is used for being connected with a motor output shaft; the wave generator comprises a cam part and a mounting part; the flexible wheel assembly comprises a flexible wheel and a mounting disc, the flexible wheel is provided with a thin-wall tooth part, a thick-wall tooth part and a rigid connecting part, and the thick-wall tooth part and the rigid connecting part are in transition connection to the two sides of the thin-wall tooth part respectively; the steel wheel assembly comprises a rigid wheel, an inner gear and a flange plate. The bearing pack comprises a first flexible bearing, a second flexible bearing and a rigid bearing which are arranged in the axial direction of the rotating shaft, and the rigid bearing is located between the first flexible bearing and the second flexible bearing; and the integrated sensor module is arranged on the thick-wall tooth part or the rigid connecting part of the flexible gear assembly.

The invention provides a permanent magnet journal sticking axle generator, which mainly comprises a stator and a shaftless rotor, and is characterized in that the stator mainly comprises a stator iron core and a winding; the shaftless rotor mainly comprises a rotor iron core, magnetic steel and a rotor support, the stator iron core is composed of a plurality of stator tooth iron core modules which are connected end to end, and stator tooth windings are wound on the stator tooth iron core modules; the rotor core is composed of a plurality of rotor core modules which are mutually connected end to end, magnetic steel is arranged in each rotor core module, the rotor support is of a split structure, and the rotor core is arranged on the outer circumferential surface of the rotor support. According to the invention, each tooth of a stator core is made into an independent stator tooth core module, and each stator tooth core module is wound with a stator tooth winding; and the rotor iron core is also manufactured into a modular structure in which each tooth part is on a rotor iron core module, so that convenience is provided for assembling, disassembling and hoisting the generator in a narrow space.

The invention discloses a stator core, a stator, a motor and a vehicle, the stator core is provided with a stator yoke part and a plurality of stator tooth parts, the plurality of stator tooth parts are connected with the stator yoke part and are distributed along the circumferential direction of the stator yoke part, the end face of the stator yoke part is provided with a plurality of first oil injection holes and a plurality of second oil injection holes, and the first oil injection holes and the second oil injection holes are distributed along the circumferential direction of the stator yoke part. The plurality of first oil injection holes are distributed along the circumferential direction, the plurality of second oil injection holes are distributed along the circumferential direction, the plurality of second oil injection holes are arranged around the periphery of the plurality of first oil injection holes, and the oil injection directions of the plurality of first oil injection holes and the plurality of second oil injection holes are inclined towards the stator tooth part. According to the stator iron core provided by the embodiment of the invention, the plurality of first oil injection holes are matched with the plurality of second oil injection holes, so that the cooling oil can be directly injected to the winding, the oil is injected to different positions of the winding, the contact area between the cooling oil and the winding is increased, and the heat dissipation effect on the winding is improved.

A method of making a teeth-only, gingiva-free dental restoration device for a full-arch dental replacement of a replacement arch of a patient may include using a computing device for: receiving a model of a replacement arch of a patient having post-extraction tooth sockets defined by a substantially original interdental and interradicular ridge of the patient; generating a model of a teeth-only, gingiva-free dental restoration device having individual replacement teeth portions each having a tooth axis extending between a gingival section and an incisal / occlusal section; designating individual replacement teeth portions to include abutment holes based on a location in the model of the replacement arch of straight implants secured within corresponding post-extraction tooth sockets; modifying at least one of a location, shape, and size of one or more of the teeth portions; and outputting information regarding the model for fabricating a teeth-only, gingiva-free dental restoration device.

The invention discloses a stator core, a motor stator, a motor and a vehicle. The stator core comprises a stator yoke part; a plurality of stator tooth parts, the plurality of stator tooth parts are arranged on the inner circumferential wall of the stator yoke part and are distributed at intervals along the circumferential direction of the stator yoke part, and two adjacent stator tooth parts and the inner circumferential wall of the stator yoke part jointly define a stator tooth groove for accommodating a stator winding; wherein a cooling flow channel which is open towards the interior of the stator tooth groove is formed in the inner circumferential wall of the stator yoke part, the cooling flow channel comprises a plurality of turbulent flow sections which are sequentially distributed in the axial direction of the stator yoke part, and at least parts of at least two turbulent flow sections are staggered in the axial direction of the stator yoke part. According to the stator iron core, the cooling liquid in the cooling flow channel can be disturbed, the fluid disturbance effect is enhanced, the heat exchange efficiency is improved, and a flowing dead zone is avoided, so that the cooling effect is greatly improved, and the stator iron core is simple in structure, low in manufacturing cost and wide in application range.

A door opening and closing device according to one embodiment comprises: a driving unit; and a link gear rotating forward or backward with respect to a rotation center in accordance with an operation of the driving unit. A tooth part connected to the driving unit is provided on one side of the link gear with respect to the rotation center, and a coupling unit coupled to a link pushing a door is provided on the other side of the link gear with respect to the rotation center. A first distance between the rotation center and the coupling unit is greater than a second distance between the rotation center and the tooth part.

The invention relates to the technical field of medical instruments, in particular to a dose adjusting mechanism of an injection device and the injection device. The push rod part penetrates through the holding part and is in threaded connection; the push rod part is sleeved with the transmission tooth part and limited in the circumferential direction, and the push rod part can move in the axial direction relative to the transmission tooth part. The transmission tooth part comprises a driven ratchet; the driving rod part can be switched from an initial position to an end position, and at the initial position, the driving ratchet and the driven ratchet are spaced in the axial direction and staggered by a preset angle in the circumferential direction; at the ending position, the driving ratchet is meshed with the driven ratchet, and the transmission tooth part rotates by an angle of one driving ratchet; the reset part drives the driving rod part to return to the initial position when the pressing force is released. The rotation angle of the transmission tooth part corresponds to the axial displacement of the push rod part, rotation of the transmission tooth part is discretized through one-by-one meshing of the driving ratchets and the driven ratchets, the single displacement of the push rod part is smaller, and the small-dose injection requirement is met.