782 results about "Axial distance" patented technology

The invention relates to an atrial septum puncture system, and belongs to the technical field of medical instruments. The atrial septum puncture system comprises a conveying sheath assembly, a dilator assembly and a puncture guide wire. The dilator assembly comprises a dilator, a puncture needle and a control handle. The conveying sheath assembly, the dilator assembly and the puncture guide wire are combined into the atrial septum puncture system, puncture operation is more convenient and safer, and the puncture guide wire and a puncture needle do not need to be frequently exchanged in the puncture operation process; according to the dilator assembly, the control handle comprises the moving part and the limiting part, the moving part is fixedly connected with the near end of the puncture needle, the moving part is used for driving the puncture needle to move in the axial direction of the moving part, and a user can control the puncture needle conveniently; the limiting step is arranged on the outer wall of the moving part, and the axial distance between the near end of the limiting part and the limiting step is 0.5-10 mm, so that the distance of a puncture needle extending out of the dilator can be limited, and the safety of puncture operation can be guaranteed.

The invention provides an optical imaging lens, the optical imaging lens has three lenses with focal power, and the optical imaging lens comprises a lens group, a bearing element group and a lens barrel, the axial distance T12 from the image side surface of the first lens to the object side surface of the second lens and the axial distance T23 from the image side surface of the second lens to the object side surface of the third lens meet the following conditions: 1.4 lt; t12 / T23lt; 2.0); the inner diameter d2m of the image side surface of the second bearing element, the inner diameter d1m of the image side surface of the first bearing element and the distance EP12 from the image side surface of the first bearing element to the object side surface of the second bearing element along the direction of the optical axis of the optical imaging lens meet the following conditions: 0.25 lt; (d2m-d1m) / EP12lt; and 1.5. The problem that miniaturization and high imaging quality of an optical imaging lens in the prior art cannot be considered at the same time is solved.

A wheel includes a boss, a rim, and a web. The rim includes a tread and a flange. A center of the rim in the axial direction of the wheel is disposed closer to the flange in the axial direction than a center of the boss in the axial direction is. The web has a plate-thickness center line that has a linear shape when the wheel is viewed in its longitudinal section. When an angle that the plate-thickness center line forms with the axial direction is denoted by a, a distance in the axial direction from a side face of the rim to an outer end of the plate-thickness center line is denoted by Pw, a length of the rim in the axial direction is denoted by Wr, and Pw / Wr is denoted by L, the wheel satisfies the expression L≥0.0223α−1.363. Where, the angle α is 90° or less.

The invention discloses an optical imaging lens, which comprises a first lens group, a second lens group and a plurality of bearing pieces, the first lens group and the second lens group are sequentially arranged from an object side to an image side along an optical axis, and the first lens group is accommodated in a first lens barrel and comprises a first lens and a second lens; the second lens group is accommodated in the second lens barrel and comprises third to sixth lenses; the first to sixth lenses are sequentially arranged from the object side to the image side along the optical axis. A third bearing piece in contact with the object side face of the fourth lens is arranged between the third lens and the fourth lens, and a fourth bearing piece in contact with the object side face of the fifth lens is arranged between the fourth lens and the fifth lens. The maximum height LB of the second lens cone, the combined focal length F2 of the second lens group, the effective focal length f4 of the fourth lens and the distance EP34 of the third bearing piece and the fourth bearing piece on the optical axis; the on-axis distance SAG41 from the intersection point of the object side surface of the fourth lens and the optical axis to the vertex of the non-light-transmitting part of the object side surface of the fourth lens and the on-axis distance SAG42 from the intersection point of the image side surface of the fourth lens and the optical axis to the vertex of the non-light-transmitting part of the image side surface of the fourth lens meet the following conditions: 0.5 lt; lB / F2lt; 1.5, 1.6 lt, 1.5, 1.6 lt; f4 / F2lt; 1.8, and 0.5 lt; eP34 / SAG41 + SAG42lt, and SAG41 + SAG42 < 2.

The utility model discloses an optical imaging system. The optical imaging system comprises a lens cone, an imaging group and a second spacing element, wherein the imaging group and the second spacing element are arranged in the lens cone. The imaging group sequentially comprises a linear polarization film, a reflective polarization element, a quarter-wave plate, a first lens, a second lens, a third lens, a fourth lens and a partial reflection layer from the first side to the second side along the optical axis; wherein the first lens and the second lens are glued, and the third lens and the fourth lens are glued. The second spacer element is disposed on the second side of the second lens and is in contact with the second side of the second lens. Wherein the outer diameter D0m of the second side end face of the lens barrel and the outer diameter D2m of the second side face of the second spacing element meet the condition that D0m-D2m is larger than or equal to 4.51 mm and smaller than or equal to 5.8 mm; the inner diameter d2m of the second side surface of the second spacing element, the inner diameter d2s of the first side surface of the second spacing element, and the axial distance T23 from the second side surface of the second lens to the first side surface of the third lens satisfy the following formula: (d2m-d2s) / T23 is greater than or equal to 0.97 and less than or equal to 2.79.

The invention discloses a planar interconnection connector and an integrated assembly, and belongs to the field of adapters. The first plug-in assembly is mounted on the first shell; the other side of the first shell is provided with a second shell, and the other end of the second shell is provided with a second plugging assembly. An adapter assembly is arranged on the inner sides of the first shell and the second shell; the outer side of the second shell is sleeved with an elastic piece, and the elastic piece abuts against the first shell and the second plugging assembly. When plugging is carried out, the second housing extends into the inner side of the first housing, and the switching assembly is stressed and compressed at the same time, so that the first plugging assembly and the second plugging assembly move oppositely along the same axis direction. The second shell shrinks to enter the inner side of the first shell, meanwhile, the switching assembly is stressed and compressed, the floating compression distance is formed through the two inserting structures, the compression stroke of 1 mm is guaranteed in the axial direction, and the large-axial-distance compression stroke is achieved under the condition that the inserting isolation degree is guaranteed.

Embodiments of a prosthetic valve delivery apparatus are disclosed. The delivery apparatus includes a first portion configured to maintain a fixed spatial relationship relative to a first end of the prosthetic valve and a second portion configured to maintain a fixed spatial relationship relative to a second end of the prosthetic valve during radial expansion of the prosthetic valve. The first portion includes one or more reference radiopaque markers and the second portion includes an indicator radiopaque marker. A position of the indicator radiopaque marker relative to the one or more reference radiopaque markers measures an axial distance between the first and second ends of the prosthetic valve indicative of a corresponding diameter of the prosthetic valve as it is radially expanded from a radially compressed state to a radially expanded state.

The utility model discloses a gas layering diffuser and a preheating cavity. The gas layering diffuser is used for supplying gas to n layers of sub-cavities of equipment and comprises an inner pipe, an outer pipe, a top wall and a bottom wall, the inner pipe and the outer pipe are concentrically nested, the inner pipe forms a gas inlet port on one side of the top wall, the top wall seals an annular cavity between the first tail end of the inner pipe and the first tail end of the outer pipe, and the bottom wall seals the annular cavity between the first tail end of the inner pipe and the first tail end of the outer pipe. The bottom wall seals the second tail end of the inner pipe and the second tail end of the outer pipe, the inner pipe is provided with a first air hole array, and the outer pipe is provided with a second air hole array corresponding to the n layers of sub-cavities, and the radial distance between the second air hole array and the first air hole array is at least a preset angle; the axial distance between the first air holes in the first air hole array is decreased along with increasing of the distance from the air inlet port. According to the utility model, the gas supply uniformity of each layer of sub-cavity, the heating uniformity and the heating efficiency can be improved.

The embodiment of the invention provides a silencer structure and a compressor, the silencer structure comprises a bottom cover structure, the bottom cover structure comprises a first side and a second side which are opposite to each other, and the wall surface of the first side is used for abutting against a flange part of an upper bearing structure of the compressor; the boss structure is arranged on the bottom cover structure; the transition part comprises a plurality of convex hull parts which are arranged at intervals in the circumferential direction of the bottom cover structure, at least one convex hull part comprises a first boss and a second boss which have different axial distances from the bottom cover structure, and the at least one first boss and the at least one second boss are adjacently arranged in the circumferential direction of the bottom cover structure; and a first exhaust hole is formed between the adjacent first boss and second boss. According to the technical scheme, under the action of the first exhaust holes, the impact direction of the airflow can be changed, and therefore the direct blowing impact force of the high-pressure refrigerant airflow on the rotor is effectively improved.

The utility model relates to a slitting tool and a slitting device. The slitting tool comprises a first cutter assembly and a second cutter assembly, the first cutter assembly comprises a first cutter shaft, a first adjusting spacer bush, a second adjusting spacer bush and a first cutter, the first adjusting spacer bush and the second adjusting spacer bush are sequentially arranged in the axial direction of the first cutter shaft and abut against each other, and the first adjusting spacer bush and the second adjusting spacer bush abut against each other through two spiral faces which are opposite in rotation direction and can be attached to each other; the second cutter assembly comprises a second cutter; the second adjusting spacer bush can rotate relative to the first adjusting spacer bush, and drives the first cutter to move in the axial direction of the first cutter shaft under the action of the first adjusting spacer bush so as to adjust the axial distance between the first cutter and the second cutter. The slitting tool and the slitting device have the advantage of being easy to operate.

Provided is a solenoid comprising a molded coil, an anchor, and an armature. In the anchor, an outer peripheral convex portion and an inner peripheral convex portion are formed. When no current is being applied, axial distance between the outer peripheral convex portion of the anchor and an outer peripheral portion of the armature which is radially closest to the outer peripheral convex portion is smaller than axial distance between the inner peripheral convex portion of the anchor and an inner peripheral portion of the armature which is radially closest to the inner peripheral convex portion. In other words, timing at which the outer peripheral convex portion of the anchor and the outer peripheral portion of the armature face each other in a radial direction is shifted from timing at which the inner peripheral convex portion of the anchor and the inner peripheral portion of the armature face each other in the radial direction.

The invention relates to the technical field of aircraft propulsion systems, in particular to a special-shaped air inlet lip for an on-wing integrated distributed propulsion short cabin unit. The lip is located at the starting part of the air inlet section and is defined by an upper lip, a lower lip, a left lip and a right lip; the inner surface of the upper lip is arc-shaped; the inner surface of the lower lip is linear and is smoothly fused with the upper surface of the wing; the inner surfaces of the left and right lips are curved surfaces with curved sweep characteristics, and the lower half parts of the left and right lips are in an inward-contracting shape; the length of the air inlet channel is defined as the axial distance from the foremost edge of the upper lip to the section of the inlet of the ducted fan and is not greater than the fan diameter D; a first rectification area and a second rectification area are arranged in the air inlet channel to optimize a flow field. Through the fusion design of the special-shaped lip and the wing and the compact air inlet channel, the requirement for compact integrated layout on the wing is met, meanwhile, the additional resistance of the nacelle is effectively reduced, the total pressure recovery coefficient not lower than 0.9 and the flow coefficient larger than 0.8 are guaranteed, and uniform and stable high-quality air inlet is provided for the ducted fan.

A valve assembly is disclosed that has a valve housing including a first axial end, a cap, a second axial end, and an airflow pathway extending from the first axial end towards the second axial end. The cap is positioned towards the second axial end. The valve housing includes an environmental opening configured for fluid communication with an outside environment, an enclosure opening towards the first axial end configured for fluid communication with an interior of an enclosure, and a film having an expansion diameter disposed in the valve housing laterally across the airflow pathway. The cap has an inner lateral surface and a piercing protrusion (having a piercing tip) extending from the inner lateral surface towards the first axial end. An axial distance is defined between the film and the inner lateral surface. A ratio of the axial distance to the film expansion diameter is at least 0.14.

The invention relates to the field of optical lenses, and discloses a camera shooting optical lens which is composed of a first lens, a second lens, a third lens, a fourth lens and a prism which are sequentially arranged from the object side to the image side. The focal length and the total optical length of the shooting optical lens are f and TTL respectively, the focal length of the first lens is f1, the combined focal length of the front two lenses is f12, the combined focal length of the rear three lenses is f234, the central curvature radiuses of the object side surface and the image side surface of the first lens are R1 and R2 respectively, the axial thicknesses of the first lens and the third lens are d1 and d5 respectively, and the central curvature radiuses of the object side surface and the image side surface of the third lens are R1 and R2 respectively. The axial distance from the object side surface of the first lens to the image side surface of the fourth lens is Td, the distance from the maximum effective aperture position of the object side surface of the third lens to the maximum effective aperture position of the image side surface of the third lens in the direction parallel to the optical axis is ET3, and the following relational expression is satisfied: f1 / f is greater than or equal to 0.30 and less than or equal to 0.70; f12 / f234 is greater than or equal to-1.40 and less than or equal to-0.426; -3.00 < = R1 / R2 < =-1.00; 0.16 < = Td / TTL < = 0.21; and 0.05 < = d5 / ET3 < = 0.66.

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.

An optical lens system for photographing, comprising four lens elements (E1, E2, E3, and E4), the four lens elements (E1, E2, E3, and E4) being, in order from an object side to an image side along an optical path, a first lens element (E1), a second lens element (E2), a third lens element (E3), and a fourth lens element (E4), each of the four lens elements (E1, E2, E3, and E4) having an object side surface facing the object side and an image side surface facing the image side; wherein the first lens element (E1) has a positive refractive index, the object side surface of the first lens element (E1) being convex in a paraxial region thereof, the second lens element (E2) having a positive refractive index, the object side surface of the second lens element (E2) being convex in a paraxial region thereof, the third lens element (E3) having a negative refractive index, the image side surface of the third lens element (E3) being concave in a paraxial region thereof, the image side surface of the fourth lens element (E4) being convex in a paraxial region thereof, and at least one surface of at least one lens element in the optical lens system for photographing has at least one inversion point (P); wherein an axial distance between the object side surface of the first lens element (E1) and the image side surface of the fourth lens element (E4) is TD, wherein an axial distance between the image side surface of the fourth lens element (E4) and an image surface (IMG) is BL, wherein a focal length of the second lens element (E2) is f2, wherein a focal length of the fourth lens element (E4) is f4, wherein a central thickness of the first lens element (E1) is CT1, wherein a central thickness of the second lens element (E2) is CT2, wherein a central thickness of the third lens element (E3) is CT3, wherein a radius of curvature of the object side surface of the first lens element (E1) is R1, wherein a radius of curvature of the object side surface of the third lens element (E3) is R5, and wherein the following conditions are met: 0.05 < TD / BL < 0.60 ; 0.05 < | f 2 / f 4 | < 1.50 ; 0.10 < ( CT 2 + CT 3 ) / CT 1 < 1.00 ; and − 4.50 < (R 1 − R 5 ) / (R 1 + R 5 ) < 0.25.

This disclosure relates to disk-style mascara brushes having thin plastic sheets and / or molded plastic used as spacers inserted between the bristle-containing disks. The spacers precisely control and adjust the axial distance between each bristle-containing disk and bristles so that the mascara brush is configured for optimal mascara deposit and eyelash separation.

The utility model provides a magnetic brake device for a fishing reel, which comprises a first mounting seat and a magnetic disc, the first mounting seat is used for being connected with the fishing reel, the magnetic disc is rotatably connected with the first mounting seat, and the magnetic disc can move relative to the first mounting seat along the axial direction of rotation; the first elastic assembly is used for enabling the magnetic disk to abut against the first mounting seat; and the at least one pushing assembly is used for changing the axial distance between the magnetic disk and the first mounting seat when the magnetic disk rotates relative to the first mounting seat. According to the utility model, the braking force on the fishing reel line cup metal sheet at the initial high-speed stage of bait throwing is large, and the braking force on the fishing reel line cup metal sheet at the tail low-speed stage of bait throwing is small, so that the effect that bait throwing is farther and more stable is realized.

The invention provides a differential roller screw transmission assembly, which comprises a nut, a screw, a plurality of rollers and a retainer group, the nut is provided with an inner hole penetrating in the axial direction, and an annular tooth section is arranged on the inner circumferential face. The threaded rod is arranged in the inner hole in a penetrating mode, a thread structure is arranged on the peripheral face of the threaded rod, the thread structure is provided with M thread lines, and M is an integer larger than one. The plurality of rollers are arranged between the nut and the screw. Each roller has a uniform pitch diameter, the periphery of each roller is provided with an annular tooth groove structure with a plurality of tooth grooves, and the annular tooth groove structures are meshed with the thread structure of the screw rod and the annular tooth section of the nut. The number of the plurality of rollers is N, and N is a factor greater than one of M. The retainer group is arranged at two ends of the roller. And the spiral angle of each thread line of the screw is matched with the circumferential distance of the plurality of rollers, so that the axial distance between any thread line and the corresponding tooth groove between the two adjacent rollers is equal to the pitch of the annular tooth groove structure. Therefore, the part design and the manufacturing process are simplified, and the load sharing effect is improved.

The thrombectomy device comprises a thrombectomy support, a connecting pipe and a traction wire, an inner cavity is formed in the thrombectomy support with the traction wire, the thrombectomy support with the traction wire comprises a cutting part located at the near end, and an opening which is communicated with the inner cavity of the traction wire and is closed in the circumferential direction is formed in the cutting part of the traction wire. The traction wire cutting part comprises a far-end end part and a near-end end part which have an axial distance; the connecting rod is connected with the near-end end part of the traction wire thrombectomy bracket; the far end of the traction wire is connected with the traction wire thrombectomy support, and when the traction wire is subjected to traction action pointing to the near end, the traction wire applies radial compression force to the traction wire thrombectomy support. The thrombus extraction efficiency of the thrombus extraction device is high.

The invention provides a simple measurement device for electron beam trajectory parameters of a traveling wave tube, belongs to the technical field of electron beam measurement, and solves the problems that an electron beam analyzer is used for measurement in the prior art, the use is relatively complex, the price is high, and the traveling wave tube is inconvenient to develop. The device comprises a base, a mounting cylinder is arranged on the base, a traveling wave tube is mounted on the mounting cylinder, corrugated pipes sleeve the outer side of the mounting cylinder at intervals, one end of each corrugated pipe is connected with the base, the other end of each corrugated pipe is connected with a sealing cover, a collector is arranged on the sealing cover, and the sealing cover is connected with an adjusting mechanism. The position of the collector is adjusted by the adjusting mechanism, so that the radial distance and the axial distance between the collector and the traveling wave tube are changed, the current density of different points in an electron beam is measured, and other track parameters are obtained; the measuring device is simple and convenient in structure and easy to operate, is an effective tool for developing a new traveling wave tube, and is also suitable for characteristic testing of various electron guns of other vacuum devices.

The invention relates to the technical field of oil and gas exploitation downhole tools, in particular to a multi-stage speed reduction gas anchor capable of being horizontally separated. The problems that an existing gas anchor is low in separation efficiency under the working conditions of a horizontal well and a high gas-liquid ratio, and gas locking of a liquid discharging pump is easily caused are solved. An annular separation cavity is formed between the outer pipe body and the inner insertion pipe. The outer pipe body is provided with an exhaust hole used for exhausting separated gas and a reverse flow guide hole used for guiding in a gas-liquid mixture to be separated. At least one set of speed reduction separation device is arranged in the annular separation cavity and comprises a plurality of half cone bodies which are sequentially arranged in the fluid direction, the large circular face end of each half cone body is fixed to the inner wall of the outer pipe body, and the small circular face end of each half cone body is cut to form a first semicircular arc and a second semicircular arc which are different in axial distance so as to form an asymmetric fluid channel. Efficient gas-liquid separation is achieved through forced fluid deceleration and disturbance, dependence on gravity is avoided, pump gas locking can be effectively prevented, and the pump efficiency is improved.

A pair of wedge lock washers with a first wedge lock washer and with a second wedge lock washer. The two washers each have a fastener opening arranged in alignment with one another, a wedge surface structure which engages with one another on their mutually facing surfaces, and clamping structures on their surfaces facing away from one another. One of the two washers has a larger outer diameter than the other washer, and has a rotary drive contour on the radial outside for torque support of a clamping tool. The clamping structures of the washer with the larger diameter are arranged at an axial distance from the disk surface in the inner disk area thereof and are designed for the form-fitting embossing of the same into the surface of a component adjacent thereto. The apexes of the wedge surface structuring are located as positive structures on the mutually facing surfaces of the wedge lock washers in a respective plane. The planes of the disk surfaces of the wedge lock washer with the smaller diameter are arranged parallel to one another.

A planetary gearset (9) has a planetary carrier (11) and a plurality of planetary gearwheel axles arranged axially offset relative to one another and on which planetary gearwheels (13) are mounted to rotate. A first carrier section (14) is arranged at a first axial end of the planetary gearwheel axles and a second carrier section (15) is arranged at a second axial end of the planetary gearwheel axles. The first carrier section (14) is in the form of a casting with the planetary gearwheel axles formed as axially projecting journals (17) made integrally with the first carrier section (14). The second carrier section (15) is attached as a separate component onto the journals (17), and the first carrier section (14) and the second carrier section (15) hold the journals (17) axially at both ends at fixed, unvarying axial distances apart from one another.

The utility model discloses a visual system, which comprises a lens barrel, and a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, a third lens and a partial reflection element which are assembled in the lens barrel and are sequentially arranged from a first side to a second side along an optical axis, the second lens has positive focal power and a plano-convex surface type, and the second side surface of the third lens is a convex surface; a first spacing element is arranged between the first lens and the second lens, and a second spacing element is arranged between the second lens and the third lens. The curvature radius R1 of the first side face of the first lens and the outer diameter D0s of the end face of the first side of the lens barrel meet the condition that R1 / D0s is larger than or equal to 1.37 and smaller than or equal to 1.80. The outer diameter D1s and the inner diameter d1s of the first side face of the first spacing element and the center thickness CT1 of the first lens meet the condition that (D1s-d1s) / CT1 is larger than or equal to 0.14 and smaller than or equal to 2.04. The axial distance EP01 from the first side end face of the lens barrel to the first side face of the first spacer element, the maximum thickness CP1 of the first spacer element and the axial distance EP12 of the first spacer element and the second spacer element satisfy 0.99 < = (EP01 + CP1) / EP12 < = 2.47.

The invention discloses a hydraulic spring operating mechanism with a double-wear-resistant ring structure, which comprises an opening / closing piston and an energy storage piston, and is used for executing actions in a reciprocating manner in a cylinder in a double-wear-resistant ring supporting manner. The double-abrasion-resistant-ring structure of the piston is achieved through contact between the two non-metal friction rings which are arranged in the axial direction in a spaced mode and the inner wall of the metal cylinder barrel, and the positioning and guiding functions are achieved. The positioning function ensures that the piston and the cylinder barrel are coaxial, the guiding function realizes guiding through mechanical sliding friction formed by the friction ring and the inner wall of the cylinder barrel when the piston reciprocates, and direct metal friction between the piston and the inner wall of the cylinder barrel is avoided. The double-abrasion-resistant-ring structure eliminates direct metal friction between the piston and the cylinder barrel to improve abrasion resistance, uniform distribution of gaps between the piston and the cylinder barrel is guaranteed through the positioning function, the sealing effect of a sealing piece is improved, the sealing piece is durable, gaps generated after long-term reciprocating motion are compensated, hydraulic oil in the cylinder barrel is prevented from leaking, and the service life of the sealing piece is prolonged. And the service life of the hydraulic spring operating mechanism is obviously prolonged.

An anoscope (1) is formed by the intervention unit (2) and the control unit (3), which function as a single system by means of the insertion of unit 1 into unit (2) slidingly and pivotally. An interface and height-adjustable mechanism permits to adjust the axial distance of the multidimensional intervention unit aperture (5) from the control unit base (12). The mechanism is made of an alignment button (9), located on the external wall of the intervention unit (2), designed to engage with the interface and height-adjusting structures located on the internal wall of the transparent core body of the control unit (3) formed by a vertical alignment track (14) with three holes (10) indicating the access points for the intervention unit (2) to the three alignment grooves (18) extending on the internal surface of the wall of the control unit (3), along the whole circumference.

A centrifugal fan according to the present disclosure comprises an impeller having a main plate and a side plate disposed apart at an interval in the direction of an axis of rotation, a plurality of blades disposed between the main plate and the side plate, and a partitioning plate dividing an air channel between the main plate and the side plate in the direction of the axis of rotation. An inlet is provided in the center of the side plate. In a cross section including the axis of rotation, the side plate is curved so as to convex toward the main plate. The side plate expands in diameter proceeding downstream. The partitioning plate is located at a shorter distance to the side plate than to the main plate. In a cross section including the axis of rotation, at least partially in the circumferential direction, the axial distance between the outer circumferential edge of the main plate and the outer circumferential edge of the partitioning plate is greater than the axial distance between the outer circumferential edge of the side plate and the outer circumferential edge of the partitioning plate, and the axial distance between the outer circumferential edge of the side plate and the outer circumferential edge of the partitioning plate is greater than the axial height of the side plate.

The bearing speed reducer comprises a speed reducing mechanism and output pieces, bearings are arranged on the two sides of a fixing part of the speed reducing mechanism respectively, the output pieces comprise the first output piece and the second output piece, and the first output piece and the second output piece are located on the two sides of the speed reducing mechanism respectively. The first output part and / or the second output part are / is arranged on the base and rotationally connected with a fixing part of the speed reducing mechanism through the bearings, the first output part and / or the second output part are / is further connected with a power output part of the speed reducing mechanism, and the first output part and / or the second output part are / is provided with holes for a power input part of the speed reducing mechanism to penetrate through. The first output piece and the second output piece are fixedly connected on the outer side of a fixing part of the speed reducing mechanism. The internal space of the speed reducer is not occupied when the two output pieces are connected, so that the speed reducer can be further miniaturized, the speed reducer has the characteristics of flattening, short axial distance and the like while keeping enough rigidity, and the problem that a small or miniature speed reducer needs to be flattened and has enough strength is solved.

Flow control valve (1) for regulating a gas flow, in particular a flow of gaseous fuel, from a gas inlet (2) to a gas outlet (3), preferably for use in internal combustion engines, in particular large engines, comprising a valve seat element (4) with at least one flow opening (5), a valve plate (6) reversibly closing the flow opening (5), which is adjustable by means of an actuation assembly (8) between a closed position of the flow control valve (1), in which a gas flow through the flow control valve (1) is blocked, and in which the valve plate (6) rests against the valve seat element (4), and a maximum opening position of the flow control valve (1), in which a gas flow from the gas inlet (2) to the gas outlet (3) is maximal, and in which the valve plate (6) rests against a stop surface (19) of the actuation assembly (8),wherein a stroke (H) of the valve plate (6) between the closed position and the maximum opening position is defined by an axial distance (D) between the valve seat element (4) and the stop surface (19) of the drive assembly (8) in an axial direction (A).