176 results about "Radial clearance" patented technology

The invention discloses a spherical roller bearing entity simulation method, device and equipment and a medium, and relates to the technical field of wind power generation. According to the scheme, when the finite element mesh model of the spherical roller bearing is constructed, the rollers are connected to the bearing inner ring and the bearing outer ring through the spring units, that is, traditional finite element constraint is replaced with the mode that the rollers are constrained through the spring units, and the conventional constraint limitation in finite element simulation is broken through; accurate analysis of bearing roller contact in a complete machine model is realized; after a complete machine finite element mesh model is generated based on a model of the spherical roller bearing, simulation parameters and loading parameters of the complete machine finite element mesh model are set, the simulation parameters at least comprise a working clearance between a roller and a raceway, that is, contact offset is added to simulate the existence of the radial clearance of the bearing, and the loading parameters of the complete machine finite element mesh model are set. The problem of simulation of play contact of the SRB main bearing under the working condition of high axial force is solved, and three-dimensional balance of physical authenticity, calculation efficiency and engineering applicability is achieved.

A front cover and a rear cover are fixedly installed and define a cavity, a driving gear shaft and a driven gear shaft are installed in the cavity, a first gear on the driving gear shaft is meshed with a second gear on the driven gear shaft, and the two gears and the inner wall of the cavity define an oil suction cavity and an oil discharge cavity. The two floating side plates are arranged on the two sides of the two gears in a penetrating mode through the driving gear shaft and the driven gear shaft respectively, an ear-shaped high-pressure oil groove and an unloading groove are formed in the face, close to the gears, of each floating side plate, the ear-shaped high-pressure oil grooves are close to one side of the oil discharge cavity, the unloading grooves are close to one side of the oil suction cavity, and the two ends of the unloading grooves are communicated with through holes of the floating side plates respectively. An ear-shaped groove is formed in the face, away from the gear, of each floating side plate, and a compensation area is formed on the floating side plates around the ear-shaped grooves. And a radial gap is formed between the peripheral edge of the floating side plate and the inner wall of the cavity. The comprehensive performance of high pressure, large displacement, low noise and high efficiency of the bevel gear pump is improved.

The invention discloses a rotary machine dynamic balance optimization method based on an attitude performance correlation model, and relates to the technical field of rotary machine dynamic balance optimization. Comprising the following steps: S1, synchronously collecting rotor vibration signals and temperature field data through temperature and vibration sensors, carrying out real-time calibration on structure parameters, substituting a temperature compensation algorithm to calculate interference components, and outputting pure vibration deviation data subjected to temperature compensation; the structural parameters comprise a rotor thermal expansion coefficient, a bearing radial clearance temperature attenuation coefficient and inherent or dynamic characteristic parameters related to material properties, geometric dimensions and connection states of the rotary machinery. The method has the advantages that through deep combination of vibration and temperature, a temperature-frequency spectrum-amplitude three-dimensional coupling traceability matrix is constructed; multi-feature matching is achieved through a fusion algorithm, temperature-dominated vibration sources and mechanical-dominated vibration sources can be clearly distinguished, and the accuracy of the dynamic balance optimization direction is guaranteed.

According to the loading device and method for the vibration test of the brake, a motor flexible shaft drives a driving mechanism to rotate to transmit power to the input end of a product, the output end of the product loads axial force through a thrust mechanism, and an eddy current sensor assembly is used for measuring the radial clearance variation of a spline of the product under a vibration load. The device can simulate and measure the actual use condition and vibration performance of a product on an airplane, can truly examine the performance and reliability of the product under the vibration test condition, is convenient to operate, can meet the vibration test requirements of products of the same type and different specifications, and has high applicability.

The invention provides a fixing clamp device and cutting equipment, and relates to the technical field of cutting equipment, the fixing clamp device comprises a shell and a driving part, the outer surface of a fixing shaft is provided with a limiting surface, the fixing clamp device is provided with a limiting matching surface, and the limiting matching surface and the limiting surface are oppositely arranged. The fixing clamp device is provided with a driving piece. The driving piece drives the fixing shaft to move along the axis of the first opening, so that the limiting face can abut against the limiting matching face in the radial direction of the driving piece. The limiting face and the limiting matching face are arranged in an attached mode, the radial shaking amount between the fixing shaft and the fixing clamp device is eliminated, the situation that due to the fact that radial deviation force exists between the power source and the fixing clamp device in a transmission mode, the moving of the fixing shaft deviates or is eccentrically abraded is avoided, the service life of the fixing clamp device is prolonged, and the reliability of the fixing clamp device is improved. In addition, the radial fit clearance is eliminated through the driving part, the requirement for the assembly precision of the fixing shaft and the fixing clamp device is lowered, and the production quality and production efficiency of the whole cutting equipment are improved.

This invention provides an electronic expansion valve, comprising: a nut assembly including a nut and a connecting plate sleeved on the nut, the connecting plate and the nut having a radial clearance fit; a valve seat, the outer wall of the connecting plate being fixedly connected to the valve seat, the connecting plate and the valve seat having an axial clearance fit in the nut; and a guide sleeve fixedly disposed within the cavity of the valve seat, the guide sleeve being inserted into the nut, the guide sleeve and the nut abutting axially and having a radial interference fit. This design ensures the coaxiality of the guide sleeve and the nut by limiting their relative movement in the axial and radial directions. Furthermore, given a fixed coaxiality between the nut and the guide sleeve, sufficient adjustment clearances are provided between the connecting plate and the nut, and between the connecting plate and the valve seat, preventing over-positioning of the connecting plate during installation from affecting the coaxiality between the nut and the guide sleeve, thus improving the coaxiality of the nut assembly and ensuring the performance of the electronic expansion valve.

The invention relates to the technical field of turbine manufacturing and maintenance, in particular to a turbine bearing and rotor journal clearance measurement method, which comprises the following steps of part in-place, gasket group arrangement, simulation compression and equivalent clearance measurement. Measuring an equivalent gap Se of at least one position at a gap between the bearing upper half tile and the rotor shaft neck in a state of maintaining the pre-tightening force; wherein the preset thickness T is set according to the target bearing top clearance C, and the target bearing top clearance C is equivalently realized and verified by controlling the thickness of the gasket group; according to the method, the radial clearance is indirectly and accurately determined by controlling the pressing position of the split of the bearing, the set value of the top clearance is verified, efficient and visual evaluation of the size of the backlash and the axial uniformity of the clearance is achieved through the geometrical relationship in the stable state, and more direct and accurate clearance verification is achieved.

This utility model provides an internal gear pump with crescent-shaped blocks, including a pump body, a pump cover, an internal gear ring, and an external gear meshing with the internal gear ring. An outer crescent-shaped block and an inner crescent-shaped block are disposed between the internal gear ring and the external gear. The outer crescent-shaped block has an outer arc surface that can engage with multiple tooth tips of the internal gear ring. The inner crescent-shaped block is composed of a first inner crescent-shaped block and a second inner crescent-shaped block, both of which have inner arc surfaces that can engage with multiple tooth tips of the external gear. A positioning pin is installed between the first and second inner crescent-shaped blocks. A pin hole is provided at one end of each of the first and second inner crescent-shaped blocks near the positioning pin for installing a rotating pin. The first and second inner crescent-shaped blocks can rotate around the rotating pin. A notch is provided in the middle of the outer crescent-shaped block corresponding to the positions of the two positioning pins. Rubber rods and springs are provided between the outer crescent-shaped block and the first and second inner crescent-shaped blocks to compensate for the radial clearance between the inner and outer crescent-shaped blocks.

The application provides a floor grinding machine gear box guide plate structure parameter optimization design method, which is used for determining the optimal values of three radial clearances between the guide plate and the gear tooth top. Firstly, a parameterized gear box model containing clearance as a variable is constructed, and a gear oil stirring loss theoretical model is established based on the boundary layer theory and the fluid resistance theory; taking the maximum lubrication efficiency as the target and the oil stirring power loss not exceeding the set threshold as the constraint condition, a central composite design method is used to select representative sample points in the design space; through computational fluid dynamics simulation, a moving particle semi-implicit method is used for splash lubrication transient analysis to obtain performance data of each point; based on the simulation data, a high-precision proxy model is constructed; finally, under the condition of meeting the oil stirring power loss constraint condition, the maximum lubrication efficiency is taken as the target for optimization solving to obtain the optimal clearance combination. The method realizes the quantitative design from parameters to performance, and effectively replaces the traditional trial and error method.

The utility model relates to the field of detection, in particular to a bearing radial clearance detection device which structurally comprises a bottom plate, a shaft seat, a second stand column and a first stand column which are arranged on the surface of the bottom plate, a movable adjusting handle and a top column which are arranged on the top of the shaft seat, and a clamping block which is arranged on the top of the second stand column. The tool is characterized in that a sliding limiting transverse shaft is arranged on the surface of the first stand column, the limiting transverse shaft comprises a clamping wheel and a clamping column, a detachable positioning block is installed on one side of the clamping column, the positioning block is matched with a sliding groove in the surface of the first stand column, the clamping wheel is in threaded fit with the front end of the clamping column, and the clamping wheel is in threaded fit with the clamping column. The opposite faces of the clamping column and the clamping wheel are provided with multi-diameter ejector blocks, the improved device is sleeved with the second sleeve rod and the third sleeve rod through the first sleeve rod, and then the improved device can adapt to bearing inner rings with more diameters. And matched bosses are arranged on the surfaces of the clamping wheels and matched with the third sleeve rod, the second sleeve rod and the first sleeve rod.

The invention relates to the field of bearing measurement, in particular to clearance detection equipment for bearing manufacturing, which comprises a workbench and a control cabinet, and is characterized in that two groups of dial indicators which are oppositely arranged are linked with a pressing cylinder capable of transversely swinging, and on the basis that an inner ring and an outer ring are synchronously fixed, when the pressing cylinder drives the outer ring to swing, the dial indicators are driven to rotate; the connecting frames on the two sides touch the measuring ends of the dial gauges respectively, and the two dial gauges independently record the radial displacement on the two sides of the inner ring in real time. By comparing the two groups of data, the overall radial clearance value can be obtained, whether the clearances on the two sides are symmetrical or unbalanced loading exists or not can be more accurately judged, and the technical limitation that an existing device cannot compare the clearances on the two sides is effectively overcome; meanwhile, automatic centering of the dial indicator is achieved through guiding of the positioning rod and the inclined face of the conical positioning groove, floating matching of the connecting cylinder and the connecting rod and buffering of the spring can adapt to the height of the bearing, the servo motor is combined to drive the bearing base to rotate to obtain multi-phase clearance data, and reliable support is provided for comprehensive evaluation of the bearing quality.

The application provides a design and calculation method of main parameters of helical gear flowmeter, and belongs to the technical field of flowmeter. The design and calculation method is obtained by theoretically analyzing the helical gear flowmeter, and the influence of the number of gears, modulus, pressure angle, helix angle, radial clearance of the flowmeter and end face clearance of the flowmeter on the flow pulsation, clearance flow leakage and power loss of the helical gear flowmeter is discussed. In combination with the particle swarm optimization algorithm, two of the three performance indexes, flow pulsation, leakage and power loss, are changed into constraint conditions according to the design requirements, so that the multi-objective problem is changed into a single-objective problem for solving the main parameters of the helical gear flowmeter. Compared with the traditional method of calculating the displacement of the flowmeter through the empirical formula and the empirical coefficient, the application can improve the displacement design precision of the flowmeter, can clearly determine the influence degree of each parameter on the performance of the flowmeter, and can quickly solve the main parameters of the helical gear flowmeter through the optimization algorithm.

The present invention discloses an internal-meshing RV-C reducer for industrial robots. After the cycloid wheel is reshaped, a reasonable clearance (radial clearance Δj and side clearance Δc) is generated between the inner cycloid teeth and the cycloid tooth grooves. This prevents the meshing parts from getting stuck when the cycloid wheel thermally expands under rated load. Furthermore, the structure of the inner cycloid gear ring is simplified and the load-bearing capacity is improved through concave-convex meshing.

A tool holder, for a tool assembly, comprising a tubular element having a cavity and a central axis; a damping mass arranged within the cavity and movable radially with respect to the central axis and relative to the tubular element; an adapter having a rear part fixed to the tubular element, and a front part for connection to an end effector of the tool assembly, the rear part comprising an opening, and the damping mass is at least partly received in the opening with a radial clearance; and an elastic element positioned between the adapter and the damping mass, the elastic element being arranged to support the damping mass and to damp radial vibrational movements of the damping mass relative to the tubular element, and the elastic element comprising a front surface substantially perpendicular to the central axis and a rear surface substantially perpendicular to the central axis.

The utility model discloses a fixture capable of adaptively fixing a grinding tool. The fixture comprises a fixture main body and an expansion part, the clamp body comprises a disc base and a cutter handle, a through hole is formed in the disc base along the central axis, and the cutter handle is arranged on the disc base through the hole. The expansion part comprises an inner supporting sleeve and a conical screw; the bottom edge of the inner supporting sleeve is fixedly connected with the disc base, the inner supporting sleeve comprises a plurality of inner supporting assemblies, the inner supporting assemblies are fixed to the periphery of the conical screw, the radial width of one end of the conical screw is gradually increased in the direction away from the disc base, and when the conical screw is pressed downwards, the conical screw is fixed to the disc base. The inner supporting assemblies elastically expand outwards. Due to the arrangement of the conical screw and the inner supporting sleeve, the radial gap between the clamp and the grinding tool is reduced, and looseness of the clamp and the grinding tool in the machining process is reduced.

This disclosure provides a wind turbine generator system, including a base, a column, a rotor assembly, a blade assembly, a stator assembly, and an energy storage component; the column is vertically mounted on the base; the rotor assembly includes multiple spaced-apart segmented rotors, with an axial clearance between adjacent segmented rotors of [value missing]. λ1 The wind turbine assembly includes at least one blade; the stator assembly includes multiple segmented stators spaced apart on the column, with an axial clearance of λ2 between adjacent segmented rotors; a coil winding connected to the energy storage component is provided on one of the stator assembly and the rotor assembly; the stator assembly and the rotor assembly are nested together, with a radial clearance δ between the segmented stators and segmented rotors in the radial direction of the column, 0 < δ ≤ λ1 ， And δ≤ λ2 ； The segmented stator and segmented rotor are radially opposite each other on the column and have magnetic attraction between them. The axial component of the magnetic attraction is balanced by the sum of the weights of the fan blades and the rotor assembly. This scheme can improve the axial magnetic levitation stiffness to reduce the possibility of system damage.

The invention belongs to the field of engine rotor and stator design, and particularly relates to an engine rotor and stator coaxiality eccentricity optimization method, which comprises the following steps: establishing a measurement reference coordinate system and a least square circle for an elastic support bearing in a structure simplified model in a matching manner, and obtaining discrete sampling point position data on the least square circle; calculating the downward eccentricity c of the elastic support by adopting a least square method; a high-pressure turbine process shaft is designed and is in centering fit with a high-pressure compressor rotor rear shaft, and a labyrinth simulation surface is designed; the final eccentric adjustment amount of the coaxiality of the sealing labyrinth and the air oil retainer is calculated; the influence of engine rotor shaft fit clearance, bearing radial clearance and static elastic support deformation on the coaxiality of the rotor and the stator can be measured and determined in advance, a high-pressure turbine simulation process shaft is designed, and eccentric compensation adjustment is performed on the engine rotor and the stator during assembly, so that the engine rotor and the stator are finally coaxial after being assembled, and collision and abrasion of the rotor and the stator are avoided; the service life of the engine is prolonged and the maintenance cost of the engine is reduced.

This invention relates to the field of wear-resistant pipe welding, specifically to a wear-resistant pipe circumferential welding device. The device includes a base with a sliding support platform on its upper end. Clamps are symmetrically arranged at one end of the support platform. Each set of clamps includes an inner edge clamping member and an outer edge clamping member arranged opposite each other, enabling bidirectional end-face positioning and fixation of the curved wear-resistant pipe end. A double-end welding mechanism is located on the side of the support platform near the clamps. The double-end welding mechanism includes two coaxially rotating trays with radial clearance notches. Welding torches are mounted on the facing end faces of the trays. The two welding torches can be adjusted to an initial position with a 180° included angle, and rotate synchronously and in the same direction with the trays to complete the circumferential welding of the curved wear-resistant pipe. This device offers high clamping and positioning accuracy for curved wear-resistant pipes, effectively suppressing welding deformation, significantly improving welding quality and work efficiency, and solving the technical problems of clamping instability, low coaxiality accuracy, and large welding deformation in existing technologies for welding curved wear-resistant pipes.

A clutch device selectively transfers rotational driving force from an input shaft to an output shaft. The device comprises a clutch center housed within a clutch housing and configured to hold alternating input-side and output-side rotating plates. The input-side rotating plates are rotationally driven by the input shaft, while the output-side rotating plates rotate with the output shaft via the clutch center. A pressure plate, movable axially relative to the clutch center, presses the alternating rotating plates into engagement. A stopper plate limits the axial separation of the pressure plate from the clutch center. The pressure plate includes circumferentially arranged pressure-side fitting teeth and a flange for pressing the rotating plates. The clutch center includes radially outwardly projecting fitting teeth arranged circumferentially. In an engaged state, radial clearance between the clutch center fitting teeth and pressure-side fitting teeth is smaller than axial clearance between ends of the clutch center fitting teeth and the flange, enhancing stability and alignment during clutch engagement.

The utility model discloses a two-stage thrust cylinder which comprises a cylinder bottom, a cylinder barrel, a guide sleeve, a piston rod, a rod head and a piston. A central tube arranged in a radial clearance is fixedly arranged in an inner hole of the piston rod, a cavity extending oil port connected with the front end of the inner hole of the central tube is formed in the rod head, and the rear end of the inner hole of the central tube is communicated with a rodless cavity behind the piston; a shrinkage cavity oil port connected with the front end of the shrinkage cavity oil duct is formed in the rod head, a plug is fixedly arranged at the rear end of the shrinkage cavity oil duct, and a connecting oil way communicating an inner hole of the piston rod with a rod cavity is arranged in the piston rod. A fixed flange plate is fixedly connected outside the front end of the cylinder barrel, a pull-back clamping key groove is formed in the outer circle of the cylinder barrel, a front clamping key groove and a rear clamping key groove are formed in the outer circle of the cylinder bottom, and a movable clamping key is matched with the pull-back clamping key groove, the front clamping key groove and the rear clamping key groove. The long-stroke propelling device can achieve long-stroke propelling, is simple in structure and low in cost, and can meet the requirement of a stable working state due to the fact that thrust and rigidity are not different in the propelling process.

A multi-row tapered roller bearing (20) that rotatably supports an axle to which a wheel of a railway vehicle is attached, the multi-row tapered roller bearing (20) having an outer ring (21), an inner ring (23), and a plurality of tapered rollers (22) that are arranged so as to be capable of rolling between the outer ring (21) and the inner ring (23), the multi-row tapered roller bearing (20) being provided with: a seal member (30) that seals the outer ring (21) and the inner ring (23); the bearing is installed on the outer ring (21) and extends from the outer ring (21) to the inner side in the radial direction. And a first-stage radial step section (26) formed on the outer diameter section (25) of the inner ring (23) adjacent to the inner diameter section of the seal member (30). Two-stage radial gaps (41, 42) are formed between the inner diameter portion of the seal member (30) and the outer diameter portion (25) of the inner ring (23) in which the stepped portion (26) is formed.

This utility model provides a pressure reducing valve fixing device and a gas cylinder chamber having the same. The pressure reducing valve fixing device includes a base and a top cover. A first mounting part is provided on the upper end surface of the base; a second mounting part is provided on the lower end surface of the top cover. The mounting groove formed by assembling the first mounting part and the second mounting part matches the circumferential direction of the pressure reducing valve, and the inner diameter of the mounting groove is larger than the maximum circumferential outer diameter of the pressure reducing valve. The mounting groove provides axial restraint for the pressure reducing valve installed therein. The pressure reducing valve fixing device provided by this utility model adopts a split base and top cover design, which is simple in structure, easy to manufacture, and has high shape accuracy, facilitating the assembly and replacement of the pressure reducing valve. The design of the mounting groove can provide axial restraint for the pressure reducing valve, effectively constraining the axial displacement of the pressure reducing valve, while retaining radial clearance, allowing the pressure reducing valve to have a small adjustment range in the radial direction, ensuring precise docking with the cylinder valve with axial offset.

A floor cleaning machine (10) is provided, comprising: a floor head (12) with a placement plane (28) for the floor (18) to be cleaned; a first disc holder (48) and a first cleaning tool (56), wherein the first disc holder (48) is arranged on the floor head (12) and holds the first cleaning tool (56), and is driven to rotate about a first rotation axis (52) when the floor cleaning machine (10) is running; a second disc holder (50) and a second cleaning tool (58), wherein the second disc holder (50) is arranged on the floor head (12) and holds the second cleaning tool (58), and is driven to rotate about a second rotation axis (54) when the floor cleaning machine (10) is running, wherein the first rotation axis (52) of the first disc holder (48) and the second rotation axis (54) of the second disc holder (50) are respectively oriented transversely to the placement plane (28), and the first rotation direction of rotation about the first rotation axis (52) and the second rotation direction of rotation about the second rotation axis (54) are opposite. Conversely, a grip device (14) is hinged to a ground head (12) in a manner that allows movement via a hinge device (16), wherein a first cleaning tool (56) is supported on a first disc holder (48) with an axial and / or radial clearance (320), a first pressure element (338) is arranged on the ground head (12), the first pressure element is associated with the first cleaning tool (56), the first pressure element can abut against the first cleaning tool (56), and sets a first tilt angle (366) of the first cleaning tool (56) relative to the placement plane (28) via the first pressure element, a second cleaning tool (58) is supported on a second disc holder (50) with an axial and / or radial clearance (320), and a second pressure element (340) is arranged on the ground head (12), the second pressure element is associated with the second cleaning tool (58), the second pressure element can abut against the second cleaning tool (58), and sets a second tilt angle (368) of the second cleaning tool (58) relative to the placement plane (28) via the second pressure element.

The invention provides a design of a flow guide plate structure of a gear box of a floor grinding machine, the gear box is a multi-stage idle gear differential planetary gear transmission system, the axis of an input shaft and the axis of an output shaft of the gear box are perpendicular to the ground, and the flow guide plate structure comprises a first flow guide plate and a second flow guide plate; the oil cylinder is fixed in a lubricating oil gathering area on the inner side peripheral wall of the gear box through a mounting part; the guide plate body is of a three-dimensional curved surface structure matched with the gear layout and is used for effectively bearing and guiding oil liquid to flow. Three specific radial clearance parameters are definitely defined, namely, a clearance delta 1 between a first flow guide plate and the tooth top of a planetary gear, a radial clearance delta 2 between the first flow guide plate and the tooth top of a second-stage idle gear, a radial clearance delta 2 between a second flow guide plate and the tooth top of a first-stage idle gear and a clearance delta 3 between the first flow guide plate and the tooth top of the first-stage idle gear; by accurately configuring the clearance parameters, the flow guide effect and the fluid resistance can be effectively balanced, and collaborative optimization of improvement of the lubricating efficiency and reduction of the oil stirring power is achieved.

The invention relates to a mechanical reduction gear (10) for an aircraft turbine engine (1), this reduction gear comprising: - a sun gear (11), - a ring gear (14), - planet gears (12) rotatably guided by bearings (8) and meshed with the sun gear (11) and the ring gear (14), and - a planet carrier (213) comprising a cage (220) in which the sun gear (11) and the planet gears (12) and the bearings (8) thereof are mounted, the cage (220) comprising an annular row of slots (300) which form two skins (236a, 236b) at each of the planet gears (12), one longitudinal end (8a) of each of the bearings (8) being mounted without clearance in the inner skin and with radial clearance (J) in the outer skin.

The invention relates to a mounted tapered roller bearing which comprises an inner ring, a bearing seat, a first outer ring, a second outer ring, a first retainer, a second retainer and a locking ring, a first mounting groove and a second mounting groove are formed in the outer wall of the inner ring, and a plurality of tapered rollers are mounted on a first annular groove and a second annular groove respectively. And the first retainer is arranged on the tapered roller of the first mounting groove. According to the conical roller bearing with the seat, the locking ring is in threaded fit with the bearing seat, so that when the locking ring is rotated, the second outer ring can axially move, the axial clearance is adjusted, the radial clearance of the conical roller bearing is changed at the same time, the clearance adjustment requirements of different working conditions are met, and the service life of the conical roller bearing is prolonged. And moreover, the production and installation difficulty of the tapered roller bearing can be effectively reduced, and the arc-shaped gum plate is arranged and can abut against and push the tapered roller to be attached and fixed to the second fixing ring, so that the tapered roller is stably arranged on the first retainer.

The invention discloses a design method of a centrifugal fan current collector, which comprises the following steps: step 1, setting the overall structure parameters of the current collector, the overall structure parameters comprising an inlet radius, an outlet radius, a height, an inlet angle and an outlet angle; 2, the minimum radial gap and the minimum axial gap between the current collector and the impeller are set; 3, the molded line of the current collector is determined to be a conic curve, and the general equation of the conic curve is shown in the specification, or corresponds to an ellipse molded line, a parabola molded line or a hyperbolic molded line; 4, associating the overall structure parameters with a conic curve equation, and establishing constraint conditions which pass through an entrance point and an exit point and meet requirements of an entrance angle and an exit angle; 5, performing normalization processing on the conic curve equation, and generating a group of molded line curves meeting limiting conditions by adjusting parameters; and 6, selecting one curve from the curve group as a current collector molded line.

The invention relates to a radial clearance adjusting mechanism for an eccentric wheel type compressor, and belongs to eccentric wheel type compressors. A driving shaft of the eccentric wheel type compressor is sleeved with the circular ring, the displacement adjusting cylinder penetrates through the lower portion of a vertical hole of the driving shaft and is inserted into a blind hole of the circular ring, the push rod assembly is installed in an axial hole of the driving shaft, the anti-return assembly is installed in the push rod assembly, and the rolling piston return device is installed on the upper portion of the vertical hole of the driving shaft. The anti-return assembly and the rolling piston return device are used for preventing the rolling piston from returning into the cylinder body again under the action of centrifugal force. The eccentric wheel type compressor has the advantages that the structure is novel, the radial clearance of the eccentric wheel type compressor provided with the mechanism reaches an ideal value through simple manual operation during assembly, the radial clearance with the same circumference is formed within the 360-degree rotation range of a rolling piston, the most ideal refrigeration efficiency is achieved, and the service life of the compressor is prolonged. And obvious superiority is realized in the aspects of manufacturing, assembling and cost.

The invention discloses a fan-shaped blade grid test device capable of independently adjusting radial and single-blade axial gaps, belongs to the technical field of pneumatic tests of turbomachinery, and aims to solve the key problem that the axial and radial composite gap effect cannot be systematically researched and single-blade installation errors cannot be simulated on the same test bed in the prior art. The test device comprises a test section, wherein the test section is provided with an upper end wall, a lower end wall and a plurality of test blades mounted between the upper end wall and the lower end wall; the test device further comprises a radial adjusting mechanism used for continuously adjusting radial gaps between blade crowns of all the test blades and the upper end wall; the axial adjusting mechanism is used for independently and continuously adjusting the axial position of each test blade; wherein the radial adjusting mechanism and the axial adjusting mechanism are two sets of physically separated independent systems and are respectively configured in different areas of the test section.

A method for determining radial play of a bearing arrangement in a wind turbine component, the bearing arrangement comprising a first component and a second component, which are movable relative to one another in a radial direction. The method comprises: capturing a first image of the bearing arrangement, the first image including the first and second components in a first relative position; applying a radially-directed load to the bearing arrangement to move the first component radially with respect to the second component by a distance that defines the radial play of the bearing arrangement so that the first and second components are in a second relative position; capturing a second image of the bearing arrangement, the second image including the first and second components in the second relative position; and comparing the first and second images to quantify the difference between the first relative position of the first and second components and the second relative position of the first and second components, thereby to determine the radial play in the bearing arrangement.