40 results about "Limit pressure" patented technology

The invention relates to a fault development gas storage operation upper limit pressure determination method considering an overpressure operation condition. The method comprises the following steps: 1, establishing a gas storage three-dimensional geomechanical model covering reservoir, cap strata and peripheral faults; 2, carrying out geomechanical simulation; 3, determining the shear failure resistance limit pressure bearing capacity and the tensile failure resistance limit pressure bearing capacity of the cover layer; 4, designing a gas logging permeability test experiment of the cover rock under different static confining pressures; 5, determining the gas breakthrough pressure of the cover rock under different pressure increasing coefficients; 6, determining the sealing limit pressure-bearing capacity of the capillary tube of the cover layer; 7, determining the anti-slip activation limit pressure bearing capacity and the anti-expansion fracture limit pressure bearing capacity of the fault; and 8, the operation upper limit pressure of the gas storage is determined. According to the method, the four-dimensional geomechanical model is established, the stress path of the reservoir building and gas injection process of the oil and gas reservoir is obtained through numerical simulation, and the dynamic horizontal principal stress of the reservoir building and gas injection process is calculated and determined by taking the determined reservoir top horizontal principal stress as the reference.

The invention discloses a motor over-temperature control method and system of a brake-by-wire system, and computer equipment, and the method comprises the steps: detecting the temperature, power and loop pressure state of a motor in real time, and obtaining the over-temperature of the motor according to the target request pressure and the working state of the motor; when the motor is normal and the pressure of the pressure cylinder reaches the target pressure, the pressure cylinder isolation valve is actively closed, and the motor is controlled to withdraw and release the pressure; when the motor is overheated to reduce power or the pressure of the main cylinder exceeds the limit pressure building capacity of the motor, the main cylinder loop is switched to supply pressure; according to the scheme, self-adaptive control over the motor load is achieved, overheating degradation caused by long-time high load is avoided, braking continuity and safety in different thermal states are guaranteed, and the system reliability and the braking force upper limit are improved.

The invention relates to the technical field of foundation pit engineering enclosure structure construction, in particular to an enclosure bottom anti-sedimentation limiting device, an inner cavity of a limiting bearing plate is provided with an anti-sedimentation assembly, the anti-sedimentation assembly comprises a positive and negative screw rod, the positive and negative screw rod is located in the inner cavity of the limiting bearing plate, and the surface of the positive and negative screw rod is fixedly sleeved with a rotating disc; an operation notch facilitating operation is formed in the top of the limiting pressure-bearing plate, threaded sleeves are arranged on the positive and negative threaded surfaces of the positive and negative threaded rod in a threaded and sleeving mode, push plates are fixedly arranged on the surfaces of the threaded sleeves in a sleeving mode, guide blocks are arranged at the two ends of the top of each push plate, guide grooves matched with the guide blocks are formed in the two ends of the top of an inner cavity of the limiting pressure-bearing plate, and positioning rods are arranged on the outer sides of the push plates. The push plate is driven by the positive and negative screws to drive the positioning rod to perform bidirectional displacement adjustment, multi-point active limiting of the bottom of the enclosure structure is achieved, differential settlement and horizontal displacement are effectively controlled, and the device has the advantages of being capable of being actively adjusted, convenient to install and high in adaptability.

The embodiment of the invention discloses a design method and device of an axial flow fan blade, a medium and an axial flow fan. The design method of the axial flow fan blade can comprise the steps that an initial blade model of the axial flow fan blade is obtained; based on the limit pressure difference of the suction surface and the pressure surface of the axial flow fan blade corresponding to the target noise and the limit turbulent flow separation point of the axial flow fan blade; designing an axial stacking line of the axial flow fan blade according to the limit pressure difference, and designing a circumferential stacking line of the axial flow fan blade according to the limit turbulence separation point; and updating the initial blade model by using the axial stacking line and the circumferential stacking line to obtain a target blade model, so that the noise of the axial flow fan blade corresponding to the target blade model during working is smaller than the target noise.

The invention relates to the technical field of hydrogen storage cylinder pressure relief and detection, and particularly discloses an explosion-proof gas storage cylinder ultimate pressure detection device and a pressure relief structure thereof. When the pressure in the hydrogen storage cylinder abnormally rises and reaches a critical value, the pressure relief mechanism is automatically started, and high-pressure hydrogen is guided to the limit relief connector. In the process, the pressure reducing mechanism intervenes the high-speed hydrogen flow, and the flow speed and pressure of the high-speed hydrogen flow are effectively reduced. When the pressure relief mechanism is started, the pre-fire-extinguishing mechanism is driven to perform pre-fire-extinguishing on hydrogen subjected to pressure reduction by the pressure reduction mechanism, so that controllable and ordered release of high-pressure hydrogen is realized, violent impact caused by instantaneous sudden drop of pressure is avoided, and a fire extinguishing agent can be early intervened in a release path; combustion reaction possibly caused by static electricity or an external fire source is actively inhibited, so that the risk of secondary burning explosion in the discharging process is fundamentally eradicated, and safe jump from passive pressure relief to active explosion suppression is achieved.

The utility model relates to a kind of multi-station detection devices, including workbench, first support, second support, limiting piece, pressure element, first detection piece;The first support is set on the workbench;The second support is set on the workbench and the second support is located in the side of the first support;The limiting piece is set on the second support;The pressure element is set on the second support;The pressure element is pressed tightly the limiting piece in acting end;The first detection piece is set on the workbench;Guiding rod is provided on the first support;The first detection piece corresponds with the guiding rod.Solved the positioning difference of traditional detection device, adaptation low, need multi-station adjustable limit pressure detection device.

The utility model relates to valve technical field, and disclose a kind of pressure reducing type backflow preventer, including valve body, drain valve seat, drain valve flap, long valve rod, fixed screw, valve cover, the valve body is provided with drain valve seat, the drain valve seat inside is provided with drain valve flap, the drain valve flap upper side is provided with long valve rod, the valve body upper side is provided with valve cover.The pressure reducing type backflow preventer, by first valve seat, first valve flap, first main valve rod, first spring seat, first spring and first hexagon nut are assembled to it before being loaded into valve body, subsequent and present an integral loading into valve body inside, greatly shorten assembly time, also suitable for the assembly in the valve body of smaller volume, the unique flow passage design of two-stage check valve, small flow resistance, open and close speed is fast, can effectively prevent the damage of sudden back pressure rise to valve and pipeline, limit pressure water backflow or siphon backflow, with mute function, effectively prolong the service life of valve.

The utility model relates to a kind of high-reliability pressure-limited pressure cooker exhaust structure, including pressure-limiting valve and exhaust pipe, the outer thread is only set in the gas outlet end outer periphery of exhaust pipe, the small diameter size of the outer thread is greater than the non-gas outlet end size of exhaust pipe, the pressure-limiting valve includes coaxially arranged inner valve body and outer valve body, the outer valve body is fixedly sleeved in the outer periphery of the inner valve body, the inside of the inner valve body is formed with accommodating cavity, the bottom of the inner valve body is provided with the opening being communicated with accommodating cavity, the opening is fixedly provided with insert, the center of the insert is provided with the internal thread being matched with the outer thread, valve tip is fixedly arranged in the accommodating cavity, the gas outlet end of exhaust pipe is inserted into accommodating cavity. After using such scheme, the risk that pressure-limiting valve is accidentally dropped due to snap spring fatigue or improper operation is fundamentally eliminated by using thread structure, and the safety and connection reliability are greatly improved.

The application discloses a long-term service performance evaluation method of a flexible composite pipe, and comprises the following steps: obtaining the limit pressure of the flexible composite pipe at the current service time and the limit time required to reach the limit pressure; obtaining the safe working pressure of the flexible composite pipe under the specific working condition environment at the long-term service time and the residual service time; establishing a linear relationship between the working pressure and the service time through the above parameters; selecting at least one test time between the limit time and the residual service time, and obtaining the maximum working pressure at the test time according to the linear relationship; loading the test time and the maximum working pressure at the test time on the flexible composite pipe to perform a survival test, if the survival test is passed, the flexible composite pipe meets the long-term service requirement, otherwise, the flexible composite pipe does not meet the long-term service requirement. The method reduces the workload, is high in operability, and can quickly respond to the long-term service performance of the flexible composite pipe under different working condition conditions in an oil and gas field.

This application discloses a limiting locking mechanism and an aircraft, relating to the field of limiting structure technology. The limiting locking mechanism includes a limiting pressure bar, a pre-tightening device, and a pressure-bearing structure. One end of the limiting pressure bar constitutes an actuating part, and the other end constitutes a limiting part. The limiting pressure bar rotates around a first horizontal axis. The distance between the first horizontal axis and the actuating part is greater than the distance between the first horizontal axis and the limiting part. The pre-tightening device applies an upward force to the actuating part to drive the limiting part downward to the limiting area. The pressure-bearing structure moves along a first horizontal path to the limiting area to push the limiting part to overcome the force of the pre-tightening device and rotate upward. The first horizontal path is parallel to the first horizontal axis. The pressure-bearing structure of this solution can overcome the pre-tightening force of the limiting pressure bar and enter the pre-tightening area with a relatively small driving force, reducing the requirements for the power source. Moreover, the limiting pressure bar can apply a large compressive force to the pressure-bearing structure after it enters the pre-tightening area, ensuring the stability of the limiting constraint.

A vacuum pump (10) with a housing (12) that defines a working chamber (14) and with a rotor (24) rotatably mounted in the housing (12) about a rotor axis (22) and carrying at least one vane (26) that is movably mounted in the radial direction, wherein the vane (26) has a transverse extension (d1) and divides the working chamber (14) into a suction side (34) with a suction inlet (32) and a pressure side (28) with a pressure outlet (33), characterized in that the housing (12) has at least one oil outlet (36, 52) opening into the working chamber (14), which is separate from the pressure outlet (33) and is closed by a pressure relief valve (38, 46), wherein the pressure relief valve (38, 46) assumes an open position when a limit pressure prevailing in the working chamber (14) above a nominal pressure is exceeded, and that the transverse extension (d1) of the wing (26) is so large that when the wing passes the oil outlet (36, 52), the oil outlet is closed by the wing (26),so that there is no fluid connection between the suction side (34) and the pressure side (28) via the oil outlet (36, 52).

The utility model discloses a rapid temperature and pressure joint for an experiment, and aims to solve the problem that the conventional joint is inconvenient to disassemble and assemble. According to the technical scheme, the connector is characterized by comprising a connector body, the tail of the connector body is provided with a head connector, the head connector is connected with a high-pressure and low-pressure filling opening of the automobile air conditioner, the side wall of the connector body is provided with a pressure connector, and the pressure connector is provided with a pressure sensor communicated with the pressure connector; the pressure sensor is provided with a pressure measuring pipe connector detachably connected with the pressure connector, the inner wall of the pressure connector is fixedly connected with a hollow cylindrical sealing clamping piece, and the diameter of the pressure measuring pipe connector is smaller than the diameter of the inner ring of the sealing clamping piece. A limiting device used for limiting the pressure measuring pipe connector is arranged in the pressure connector. According to the utility model, the plugging installation of the pressure measuring pipe joint is realized through arranging the sealing clamping piece and the limiting device, so that the installation of the pressure sensor is more convenient.

The application relates to the field of regulating valve testing, and discloses a regulating valve pressure measuring equipment for an air conditioner dehumidifier, which comprises a workbench and three pressure measuring box bodies arranged on the top of the workbench, the three pressure measuring box bodies are a high-temperature box, a low-temperature box and a normal-temperature box, pressure measuring mechanisms are arranged in the high-temperature box, the low-temperature box and the normal-temperature box, the pressure measuring mechanism comprises a storage structure arranged at the bottom of the pressure measuring box body and used for placing a regulating valve, the inner walls of the pressure measuring box body are provided with sealing structures used for sealing the end of the regulating valve, the sealing structure comprises a sealing head, the sealing head can move in the pressure measuring box body, the end of the regulating valve placed on the storage structure can be sealed, and a first pipeline interface used for connecting a test pipeline is arranged on one side of the pressure measuring box body. Double measurement is used for verification, so that the test result is more accurate. The limit pressure value when the regulating valve is deformed or damaged can be measured by continuously filling gas, and the limit pressure resistance of the regulating valve can be known.

The application provides a method and device for calculating the working gas amount of an underground gas storage which is increased due to an increase in the upper limit pressure, the method comprising: splitting the underground gas storage into a plurality of gas storage units with each gas injection well as the center of each gas storage unit; simulating the operation of each gas injection well in each gas storage unit to obtain the bottom hole pressure resistance value of each gas injection well; determining the stratum radius influenced by each gas injection well in each gas storage unit according to the bottom hole pressure resistance value of each gas injection well, the operation parameters of the underground gas storage and the target upper limit pressure of the underground gas storage; determining the increased working gas amount of each gas storage unit and the increased working gas amount of the underground gas storage according to the stratum radius and the target upper limit pressure. By splitting into the gas storage units with the gas injection well as the center, the stratum radius influenced by each gas injection well is determined independently, the problem of pressure imbalance does not need to be solved, and the working gas amount of the underground gas storage which is increased due to an increase in the upper limit pressure can be accurately determined.

The invention belongs to the technical field of nuclear power, and particularly relates to a method and device for determining the limit pressure-bearing performance of a pit defect of a heat transfer tube of a steam generator. According to the method for determining the limit pressure-bearing performance of the pit defect of the heat transfer tube of the steam generator, the maximum pressure allowed to be borne by the heat transfer tube with the pit defect can be rapidly, reasonably and conservatively calculated, and rapid evaluation can be provided for state monitoring and operation evaluation of the nuclear power steam generator. By means of the method, the ultimate bursting pressure calculation method for the pit type defect of the heat transfer pipe can be optimized, and the bursting pressure of the heat transfer pipe with the pit defect can be represented more accurately. Therefore, the influence of the pit defect on the bearing capacity of the heat transfer tube is effectively identified in heat transfer tube integrity evaluation, and the failure risk of the heat transfer tube is reduced.

The application relates to the technical field of hydrogen storage cylinder pressure relief and detection, and particularly discloses an anti-explosion gas storage cylinder limit pressure detection device and a pressure relief structure thereof. When the pressure in the hydrogen storage cylinder abnormally rises and reaches a critical value, the pressure relief mechanism is automatically started to guide the high-pressure hydrogen gas to a limit relief joint. In the process, the pressure relief mechanism intervenes in the high-speed hydrogen gas flow to effectively reduce the flow rate and pressure of the hydrogen gas. When the pressure relief mechanism is started, the pre-fire extinguishing mechanism is driven to pre-extinguish the hydrogen gas after the pressure relief of the pressure relief mechanism, controllable and orderly relief of the high-pressure hydrogen gas is realized, violent impact caused by instantaneous pressure drop is avoided, and the early intervention of the fire extinguishing agent in the relief path can actively inhibit the combustion reaction caused by static electricity or external fire sources, so that the secondary explosion risk in the relief process is fundamentally eliminated, and the safety is greatly improved from passive pressure relief to active explosion suppression.

Adjustable vane pump (10) with a suction side (46) and a discharge side (21), with a housing (12) and with a rotor (18) rotatably mounted in the housing (12) about a rotor axis (16) and carrying at least one vane (22) movable in the radial direction, wherein the housing (12) comprises a housing base (30) and a housing cover (26) transversely to the rotor axis (16), and wherein an adjustable cage (32) is provided in the housing (12) between the housing base and the housing cover, surrounding the rotor (18) together with the vane (22) and adjustable transversely to the rotor axis (18), wherein the housing (12) and the adjustable cage (32) define a pressure chamber (38) fluidly connected to the discharge side (21), wherein a return element (36) is provided which forces the adjustable cage (32) into a basic end position, and wherein the adjustable cage (32) is deflected from the basic position when a limit operating quantity designed as limit pressure is exceeded in the pressure chamber (38),characterized in that the rotor is driven by an electric motor designed as a rotor drive (19), wherein the rotor drive (19) is operated in the nominal speed range (a) both when the adjustable cage (32) is in the basic end position and when the adjustable cage (32) is deflected from the basic end position, and in that adjustment of the adjustable cage (32) takes place directly depending on the pressure-side pump pressure, wherein the pressure side (21) is fluidically directly connected to the pressure chamber (38).

The utility model discloses a multipurpose test fixture for a leaf spring in a locomotive brake system, which comprises a bottom plate, a supporting assembly for supporting the middle of a leaf spring body is arranged in the middle of the upper end face of the bottom plate, and a supporting and pressing assembly for supporting and pressing the right end of the leaf spring body is arranged at the right end of the upper end face of the bottom plate. The left end of the upper end face of the bottom plate is detachably provided with a limiting crimping assembly which is used for pressing the left end of the leaf spring body downwards and keeping a certain deformation distance. The device further comprises a rolling shaft assembly which is installed on an installation seat of the leaf spring body during testing. According to the utility model, three performance tests of elasticity modulus, deformation quantity and fatigue resistance can be carried out on the leaf spring, and multiple functions are realized, so that the types of clamps used in leaf spring performance tests are effectively reduced, and the cost input cost of the clamps is greatly reduced; after the leaf spring is fixed on the clamp, three performance tests of elasticity modulus, deformation quantity and fatigue resistance can be carried out in sequence, so that the labor cost is effectively reduced, the test efficiency is remarkably improved, and the requirement of large-batch delivery of the leaf spring can be met.

The utility model discloses a testing device for simulating the loading capacity of an assembly on a flexible support, which comprises a testing device main body, a pressing area and a pulling area are distributed at the four corners of the upper end of the testing device main body, and an air pressure ball is arranged at the left end of a connecting pipeline. Existing dynamic mechanical load equipment is transformed, the surface of an assembly is divided into four areas, diagonal areas are pulled up and pressed down at the same time, left half parts of long and short sides of the assembly are pulled up, right half parts of the long and short sides of the symmetrical positions of the assembly are pressed down, force is symmetrically applied, each working condition circulates for 1000 times, and the number of times of circulation can be adjusted. One to three cycles are completed per minute, the maximum pressure is + / -1000Pa, the pressure value can be adjusted, and the holding time under the ultimate pressure is at least 7 + / -3s, so that the torsion resistance of the assembly on the flexible bracket is effectively evaluated, the cost per kilowatt-hour is reduced, and the terrain limitation is broken through.

The utility model relates to the technical field of positioning jigs, in particular to a U-shaped workpiece positioning jig which comprises a base, two limiting devices are fixedly installed in the middle of the upper end of the base, the two limiting devices are installed on the base in a bilateral symmetry mode, and two limiting frame plates are arranged at the upper end of the base. The two limiting frame plates are installed on the base in a bilateral symmetry mode, the limiting frame plates are arranged at the upper end of the limiting device, and the two U-shaped workpieces are arranged at the upper ends of the limiting frame plates in a clamped mode. When the device is used, the two rotary telescopic air cylinders are controlled to rotate and contract through an external control machine, so that the circular pressing plate is in contact with the side end of the U-shaped workpiece, and at the moment, the pressure sensor is used for monitoring the pressure borne by the U-shaped workpiece from the circular pressing plate; therefore, the situation that the limiting pressure applied by the rotary telescopic air cylinder exceeds the bearing range of the U-shaped workpiece, deformation is caused, then positioning accuracy of the U-shaped workpiece is affected, and the machining inferior product rate is increased is prevented.

Embodiments herein relate to systems and methods for monitoring a bypass valve of a filtration system. In an embodiment, a bypass valve monitoring system is included having a control circuit and a sensing unit, where the sensing unit generates a signal reflecting a high speed pressure and a signal reflecting a filter limit pressure. The bypass valve monitoring system may identify a pattern of the signal reflecting the high speed pressure associated with the filter limit pressure level indicative of the position of the bypass valve. In an embodiment, the sensing unit generates a signal reflecting acoustics and / or vibrations and a signal reflecting strain, and the system is configured to identify a pattern reflecting valve chatter associated with the signal reflecting acoustics and / or vibrations, and then determine a bypass valve open state using associated strain values in the signal reflecting strain. Other embodiments are also included herein.

The invention relates to a sealing assembly (2) comprising a piston (4) having a longitudinal axis L, the piston comprising at least two radial piston walls (10, 11), i.e. a first and a second radial piston wall, relative to the longitudinal axis L, between which a recess (12) is formed, and a seal (3) which is received in the recess (12), wherein a first sealing lip (8) extends radially outward beyond the radial piston walls (10, 11), characterized in that the first radial piston wall (10) extends radially outward less than the second radial piston wall (11), and a second sealing lip (9) rests sealingly against the first radial piston wall (10) and seals with said wall into a space (13) at a pressure below a predetermined limit pressure p G , at which pressure the bypass line (5) within the piston (4) extends at least partially around the recess (12), wherein the second sealing lip (9) pivots radially inward at a pressure above the predetermined limit pressure p G , so that the space (13) is opened.

The utility model relates to a kind of multi-nozzle steam pressure matchers, including high-pressure steam chamber and pressure matcher shell, the high-pressure steam chamber is provided with several nozzles and sealing end cap, each nozzle and sealing end cap are respectively provided with valve stem, each nozzle and pressure matcher shell are respectively provided with mixed steam guide pipe, each mixed steam guide pipe is respectively provided with reducing guide pipe inside, each reducing guide pipe is respectively provided with expansion mixing pipe, each nozzle and sealing end cap are respectively provided with fixing device, the fixing device includes the limiting pressure sleeve set on nozzle, compression spring, installation slot, first locating ring, locating plate, connecting rod and first adjusting nut. It can be installed to preset position conveniently. The utility model is convenient to use, with extensive market prospect.

Provided is a compressor capable of improving an energy saving effect corresponding to a use state of compressed gas.　A control device 10 of a compressor has a control function for switching to an unload operation of a compressor body 1 when a discharge-side pressure rises to an upper limit pressure in a load operation of the compressor body 1. The control device 10 further has a control function for switching to an eco mode in which the upper limit pressure becomes a second pressure lower than a first pressure when a cycle time is equal to or longer than a determination time in a normal mode in which the upper limit pressure is the first pressure. The control device 10 records a transition of the pressure in a tank 4 detected by a tank pressure sensor 15, calculates a recommended value of the second pressure on the basis of a maximum value of a decrease width of the pressure in the tank 4, and causes the recommended value of the second pressure to be displayed on a display unit 13.

The utility model provides a hydraulic control system. The hydraulic control system comprises an oil pump, a main valve, an upper limit pressure signal valve and a lower limit pressure signal valve. The main valve comprises a main valve first valve position and a main valve second valve position, and the oil pump can be connected to a load to be cooled and / or lubricated through the main valve first valve position or connected to the clutch oil cylinder through the main valve second valve position. The upper limit pressure signal valve comprises an upper limit first valve position and an upper limit second valve position, and the hydraulic control system is configured in the mode that when the pressure of the clutch oil cylinder is larger than preset upper limit pressure, the upper limit second valve position is a working position, the main valve first valve position is switched to the working position, and the oil pump supplies oil to a load. The lower limit pressure signal valve comprises a lower limit first valve position and a lower limit second valve position, and the hydraulic control system is configured in the mode that when the pressure of the clutch oil cylinder is smaller than the preset lower limit pressure, the lower limit second valve position is a working position, the main valve second valve position is switched to the working position, and the oil pump supplies oil to the clutch oil cylinder.

The utility model relates to sensor detection technical field, concretely relates to sensor detection machine, include: substrate, along the first direction extension, first direction is perpendicular to vertical direction, pressure -exerting spare, locate in the substrate and be equipped with multiple, each pressure -exerting spare evenly spaced distribution along the first direction, pressure -exerting spare is used for to sensor to add load, vertical drive spare, act on the substrate, for driving substrate along vertical reciprocating movement, signal measurement unit, for with sensor establishes communication connection to obtain sensor after the output signal of load that exerts through pressure -exerting spare, along the width direction of substrate, the side surface of substrate is recessed to form multiple recesses corresponding to pressure -exerting spare inward, each recess evenly spaced distribution along the first direction, along the width direction of substrate, the part of substrate near the end of recess is bent to form multiple limit portion upward, any one recess along the first direction all is equipped with one limit portion in any one side, limit portion is used for the wall portion of cooperation recess to limit pressure -exerting spare along horizontal direction movement.

The application discloses a dam pipe gushing emergency device and a use method, which comprise a frame body, a center partition plate, side partition plates, filter frames, filter screens, a cover plate and a drain outlet. The cover plate is arranged on the top of the frame body, and the top of the cover plate is provided with an integrated drain outlet for discharging filtered water. The inner side of the frame body is fixed with a center partition plate and two side partition plates. Filter frames are inserted between the center partition plate and the side partition plates and between the side partition plates and the inner wall of the frame body. A limiting mechanism composed of a limiting pressure rod, a shaft cylinder, a limiting structure and an auxiliary positioning structure is arranged. After the filter frame is inserted into the inner side of the frame body, the limiting mechanism can be used to quickly and stably position the filter frame, so that the problem of complicated limiting mode after the insertion of the filter frame in the original device is solved, and the operation personnel can conveniently and quickly assemble the device on site, and the assembly convenience and emergency disposal efficiency are improved.

The embodiment of the present disclosure discloses a design method, device, medium and axial flow fan of an axial flow fan blade. The design method of the axial flow fan blade can include: obtaining an initial blade model of the axial flow fan blade; based on a limit pressure difference of a suction surface and a pressure surface of the axial flow fan blade corresponding to a target noise, and a limit turbulent separation point of the axial flow fan blade; design an axial accumulation line of the axial flow fan blade according to the limit pressure difference, and design a circumferential accumulation line of the axial flow fan blade according to the limit turbulent separation point; update the initial blade model to obtain a target blade model by using the axial accumulation line and the circumferential accumulation line, so that the noise of the axial flow fan blade corresponding to the target blade model is less than the target noise when working.