169results about How to "Reduce pressure shock" patented technology

The invention discloses a hydraulically-driven vehicle chassis which comprises an engine, a variable pump, at least four wheels, at least four variable-displacement motors, at least two reversing valves and an oil tank, wherein the engine drives the variable pump to pump oil; the variable pump provides hydraulic oil to each variable-displacement motor through the reversing valves; each variable-displacement motor drives one wheel to rotate; each reversing valve controls an oil in / out oil line of two variable-displacement motors on the coaxial wheels; and the return oil line of each variable-displacement motor is communicated with the oil tank. The invention further provides construction machinery. According to the invention, a hydraulic return circuit is an opened system, and the hydraulic system has good radiating performance, and small pressure impact. The vehicle speed can be improved through controlling the variable pumps and the discharge capacity of the variable-displacement motors, and vehicle speed adjustment range can be further expanded as some variable-displacement motors are reduced to zero in discharge capacity, so that the starting acceleration is large and the speed regulation range is wide.

The invention discloses a TBM (Tunnel Boring Machine) experiment table thrust hydraulic system capable of conforming sudden-change load. The TBM experiment table thrust hydraulic system comprises a high-pressure oil source, a low-pressure oil source, a high-pressure control oil passage, a low-pressure control oil passage and an inlet and outlet oil passage comprising four thrust hydraulic cylinders in parallel connection. One end of the high-pressure control oil passage and one end of the low-pressure control oil passage are respectively connected with the respective high-pressure oil source and low-pressure oil source, and the other end of the high-pressure control oil passage and the other end of the low-pressure control oil passage are respectively connected with rod cavities and rodless cavities of the four thrust hydraulic cylinders in parallel connection. The low-pressure oil passage is used for controlling rapid thrust and rapid reset process of a TBM experiment table; the high-pressure oil passage is used for controlling high-pressure thrust and back-off process of the TBM experiment table. Under the working condition of normal thrust, each thrust hydraulic cylinder can realize the switching of the control mode of a proportional pressure reducing valve and the control mode of a proportional one-way throttle valve and a proportional overflow valve; under the control mode of the proportional one-way throttle valve and the proportional overflow valve, the sudden-change load encountering during the thrust process can be conformed in combination with an energy accumulator connected to the rodless cavity of the thrust hydraulic cylinder, and thus instant pressure impact is buffered, and the service life of a hydraulic element of the system is prolonged.

The invention relates to an oil charging and semi-linkage-point self-learning method of a double-clutch automatic transmission. After an oil charging control module receives an oil charging command, the oil charging control module receives a present oil temperature detected by a sensor, and divides the oil charging pressure of a clutch into set phases according to the present oil temperature; and then, the oil charging control of the clutch is finished by an oil pressure step ascending mode. The method adopts an interpolation segmented ascending step oil charging method to reduce the clutch pressure impact problem and to prolong the service life of a hydraulic actuation unit; as the oil charging pressure is equally divided, the moving amplitude of an electromagnetic valve is relatively lower, the blockage is not easy to generate, the service life is prolonged, and the fault generation frequency is reduced; and meanwhile, the method is higher in response speed and precision.

The invention provides an automatic discharge and self-cleaning filter device for an emulsion pump station. The device comprises an entrance pressure gauge, a high-pressure energy storing device, a discharge valve, an entrance pressure sensor, a one-way valve, an exit pressure gauge, a ball valve, an exit pressure sensor, connecting pipes and an electric control system; an entrance connected with the emulsion pump station is provided with a low-pressure energy storing device; one or more precision filters are connected in parallel with a pipeline communicated to a liquid supply system, and an entrance passage of each precision filter is connected with a two-position four-way hydraulic change-over valve; a control oil passage of each two-position four-way hydraulic change-over valve is connected in series with a two-position three-way electromagnetic valve; an oil inlet pipeline of each two-position four-way hydraulic change-over valve is provided with a flow rate sensor; and each two-position four-way hydraulic change-over valve and an oil return opening of the two-position three-way electromagnetic valve corresponding to the two-position four-way hydraulic change-over valve are connected with a coarse filter which is connected with an oil tank by a pipe. The device has the advantages of simple structure, high reliability, little system pressure impact, low vibration and noise, convenient use and easy maintenance.

The invention discloses a fixed shelter with a double-protection structure, which is mainly applied in facilitates underground, such as a down hole in a mine, the interior of a tunnel, a subway, and the like, and civil defense facilitates, and is used for emergent avoidance of staffs in danger. The shelter comprises a roadway lifesaving guide area 1, a double-protection area 2 and a safety sheltering area 3, wherein the roadway lifesaving guide area 1 comprises a lifesaving guide device 4 arranged in a roadway, a shelter door-closing and alarming device and a sensor 5 of an environmental security detection device; the double-protection area 2 is provided with double protective walls which are provided with protective doors; the protective door arranged on a first protective wall 10 is a waterproof door 13, the protective door arranged on a second protective wall 11 is a fireproofing explosion door 14, and the waterproof door 13 and the fireproofing explosion door 14 are arranged in a staggered manner; the double-protection area 2 is internally provided with a self-helping device 15, an air purifying device 9 and a sensor 8 of the environmental security detection device; and the safety sheltering area 3 is internally provided with an oxygen system, food, water, a power supply, an air purifying device 32, the environmental security detection device 32 and medical facilities which are required for self-helping of the staff in danger, as well as communication facilitates communicated with the outside. The shelter has good sealing, waterproof, fireproof, anti-explosion, heat insulating, pressure impacting resistant performances, and is convenient to use.

The invention discloses a closed type hydraulic transmission system which solves the problem that impact pressure on a motor shell caused by high-pressure oil during status switching and a certain amount of pressure existing in a loop when a hydraulic motor does not work produce resistance on vehicle running. The closed type hydraulic transmission system comprises a power input mechanism, a hydraulic pump assembly, a hydraulic control valve set, a first hydraulic motor, a second hydraulic motor, a non-pressurization oil tank and a control unit. The power input mechanism is in mechanical connection with the hydraulic pump assembly which is in pipeline connection with the hydraulic control valve set, the hydraulic control valve set is in pipeline connection with the first hydraulic motor and the second hydraulic motor respectively, the first hydraulic motor is in mechanical connection with a load mass body of the first hydraulic motor, the second hydraulic motor is in mechanical connection with a load mass body of the second hydraulic motor, both the hydraulic pump assembly and the hydraulic control valve set are in pipeline connection with the non-pressurization oil tank, and the control unit is connected with the hydraulic pump assembly and the hydraulic control valve set through signal wires.

The invention discloses a frequency conversion hydraulic elevator system, consisting of a leakage measurement system, a leakage estimating system and a pressure adjusting system; wherein, the leakage measurement system consists of a first pressure transmitter, an oil temperature sensor, a motor side encoder and an elevator car side encoder; the practical leakage quantity of the hydraulic system is directly measured during the running process of the elevator; furthermore, corresponding leakage quantity is memorized according to the conditions of oil temperature and load during the measurement process; the leakage estimating system consists of a second pressure transmitter and an oil temperature sensor; leakage quantity parameters under the corresponding conditions of oil temperature and load memorized by the leakage measurement system are extracted, the leakage quantity of the hydraulic system is estimated and the leakage is compensated before the elevator is started; the pressure adjusting system consists of the first pressure transmitter and the second pressure transmitter; during the starting process of the elevator, the rotation speed of the hydraulic pump is adjusted gradually so as to lead the oil pressure at the outlet of the hydraulic pump and the oil pressure in the oil cylinder to achieve balance. The frequency conversion hydraulic elevator system can reduce the speed impact and pressure impact during the starting process of the frequency conversion hydraulic elevator and leads to stable and quick starting process.

The invention discloses a buffering oil cylinder and relates to the technical field of hydraulic oil cylinders. The buffering oil cylinder comprises a cylinder barrel, a cylinder cover, a piston and a piston rod, wherein the piston rod is sleeved by a buffering sleeve, the buffering sleeve is in clearance fit with the piston rod, and the buffering sleeve is in clearance fit with a buffering hole formed in the cylinder cover. A rod cavity is communicated with an oil return opening formed in a cylinder body through the buffering hole, the two ends of the buffering sleeve are respectively in butt joint with a shoulder of the piston and a shoulder of the piston rod, a plurality of first oil channels are formed in two end faces of the buffering sleeve, a conical inclined guide face is arranged at one end, adjacently connected with one end of the rod cavity, of the buffering hole, an annular ditch is formed in the inner wall of the buffering sleeve in the peripheral direction, a buffering ring capable of moving in the annular ditch in the axial direction is arranged in the annular ditch, the gap between the buffering ring and the piston rod is smaller than the gap between the buffering sleeve and the piston rod, and a plurality of second oil channels are formed in a rear end face, facing the piston, of the buffering ring. The buffering oil cylinder solves the problems that an existing buffering oil cylinder is prone to being blocked in a buffering process, large in pressure impact and prone to vibrating and crawling in a starting process.

The invention discloses a braking hydraulic system of a wind driven generator. The braking hydraulic system comprises a controller and a spindle rotating speed sensor for detecting a rotating speed of a spindle as well as a spindle braking hydraulic oil-way; a second electric proportional pressure reducing valve, a first reversing valve and a spindle brake are arranged in the spindle braking hydraulic oil-way; the first reversing valve is arranged in the oil-way between the second electric proportional pressure reducing valve and the spindle brake; a second pressure sensor is arranged in the oil-way between the first reversing valve and the spindle brake; the controller regulates a pressure of an outlet of the second electric proportional pressure reducing valve according to a signal of the second pressure sensor and a signal of a spindle rotating speed sensor so that a product of an output pressure of the second electric proportional pressure reducing valve and a spindle rotating speed is constant. The invention further provides the wind driven generator; constant-power braking of the spindle brake is realized; the spindle is braked stably and pressure impact is reduced; as a result, the damage of a booster engine gear in the wind driven generator unit is avoided and the service life of the booster engine gear is prolonged.

The invention discloses an intelligent optimized design method of an axial piston pump, in particular to an optimized design method of an axial piston pump valve plate based on a particle swarm optimization method. The minimum peak value of the pressure gradient serves as the objective function under the condition of no pressure difference transition, and the optimized design is conducted on the structural parameter of the valve plate. According to the optimized design method of the axial piston pump valve plate based on the particle swarm optimization method, the symmetric deflection type valve plate, whereina damping groove is opened to serve as the basis, and the axial piston pump is built. After oil is sucked by each piston cylinder bore, the axial piston pump enters a pre-boost area to boost the characteristic differential equation in advance. After the oil is discharged by each piston cylinder bore, the axial piston pump enters a pre-pressure-relief area to relieve the pressure of the characteristic differential equation in advance. An updating mechanism which is searched by multiparticles in parallel applies the acceleration adaptive particle swarm optimization algorithm, and the optimal matching of the structural parameter of the valve plate is obtained. The optimized design method of the axial piston pump valve plate based on the particle swarm optimization method provides a high-efficient solution for how to reduce the pressure shock in the pump and how to suppress the noise.

An alignment system for aligning the cover and base of an inner pod of a reticle carrier. The cover and base can each be provided with hard planar surface seal zones on the bottom surface and the top surface, respectively. The cover of the inner pod may be provided with a through hole or a blind hole into which an alignment pin is disposed. The base is provided with a guide recess to receive the distal end of the alignment pin. The alignment pin operates to limit contact surface area between the cover and the base during that is in sliding contact, thus inhibiting particulate generation. Low particulate-generating materials, such as stainless steel or polyamide-imide, can also be utilized to further reduce particulate generation. Furthermore, the cover and base can each be unitary without need for fastening components thereto, thereby eliminating clamped surfaces that can entrap and subsequently shed particulates.

The invention discloses a high-pressure high-speed axial piston pump piston pair four-axis force testing device which is mainly composed of a swash plate shaft, a bearing assembly, a tested piston pair, an auxiliary piston pair, a four-axis force sensor, an oil lead piston, a piston base, a piston shoe press plate, a preloaded piston, a compression spring, a spring seat and the like. The ingenious lubrication structure of the ball head and hinge joint of the preloaded piston with adjustable pretension and the bearing assembly, the swash plate shaft in a dynamic balance balancing structure, the tested piston pair, the auxiliary piston pair, the oil lead piston and the four-axis force sensor with a center through hole structure are designed. The tested piston pair and the auxiliary piston pair are symmetrically arranged. The ball head structure of different sizes on both ends and the ball hinge pair of the oil lead piston are connected. Interference factors on the tested piston pair are eliminated. Three-dimensional direction action force and axial torque of a high-pressure high-speed piston pair are measured. The device has the advantages of simple and reliable overall structure, easy part replacing and low machining and detection cost.

The invention discloses a load-sensitive rotation buffer valve and a crane rotation hydraulic system. A middle path of a rotation reversing valve is sequentially connected with a guide oil port of a three-way pressure compensation valve and an oil inlet of a constant flow valve through an LS feedback oil path, an oil inlet of the three-way pressure compensation valve is communicated with an oil inlet of a valve body, an oil outlet of the three-way pressure compensation valve is communicated with an oil returning opening of the valve body, an oil outlet of the constant flow valve is divided into two paths, one path is directly connected with the oil returning opening of the valve body, the other path is communicated with an oil inlet of a first one-way valve and an oil inlet of a second one-way valve at the same time, a speed adjusting valve is formed by the three-way pressure compensation valve and the rotation reversing valve, flow adjustment of a work oil port A and a work oil port B is achieved, flow is output proportionally, influences of the load are avoided, in the whole operation process, action is stable, fast and slow action is avoided, stable opening is achieved, during stopping, pressure impact is small, and a crane cannot rotate and swing.

The invention provides a hydrogen gas storage bottle opening control method for a fuel cell hydrogen system. The hydrogen gas storage bottle opening control method comprises multiple steps: obtaininga state when the fuel cell hydrogen system stops last time; judging whether the state when the fuel cell hydrogen system stops last time is a normal stop state or not, and obtaining a hydrogen gas pressure value in each hydrogen gas storage bottle in the fuel cell hydrogen system if the state when the fuel cell hydrogen system stops last time is judged to be normal stop state; and sequentially opening hydrogen gas storage bottles in the hydrogen system in sequence according to the sequence that the hydrogen gas pressure value is from low to high. The method has the advantages that pressure impact, on the hydrogen system, of hydrogen bottle pressure every time the hydrogen system starts is reduced, and the service life of the hydrogen system is prolonged.

The invention relates to a road roller open type vibration system with automatic frequency adjustment and single and double vibration functions. The system is characterized by comprising two parts, namely, a hydraulic loop part and an automatic control part, wherein the hydraulic loop part comprises a gear pump, a first electromagnetic valve, a safety valve, a first motor, a second motor and a second electromagnetic valve 6; and the automatic control part comprises a digital analog converter, a PID (proportion integration differentiation) controller, a first velocity sensor, a second velocity sensor and a comparator. According to the road roller open type vibration system with the automatic frequency adjustment and single and double vibration functions, the rear-wheel vibration frequency can be adjusted in real time according to changes of the front-wheel vibration frequency, so that the influence of a series connection hydraulic system on the operation comfort due to large difference of the front-wheel vibration frequency and the rear-wheel vibration frequency is effectively reduced, and the compactness and the flatness are effectively improved.

A method and apparatus for controlling a solenoid actuated inlet valve to a pump chamber of a piston pump. A control circuit energizes the solenoid to open the inlet valve in synchronism with the reciprocation of the piston and thereafter de-energize the solenoid to initiate closure of the inlet valve. The inlet valve is decelerated following de-energization of the solenoid thus effectively reducing engine noise attributable to the inlet valve.

The invention discloses a dustproof sealing ring, which includes a main oil seal, and is characterized in that the main oil seal includes a metal skeleton, an annular sealing spring and a sealing rubber, the sealing rubber is arranged inside the main oil seal, and one end of the sealing rubber There is a first sealing part for clamping and sealing the metal frame and the other end is provided with a second sealing part for clamping and sealing the annular sealing spring, and the outer wall of a secondary oil seal is tightly engaged in the metal frame of the main oil seal. Adding a secondary oil seal on the inner side of the main oil seal can effectively prevent impurities in the sealing medium, and can properly reduce the pressure shock in the cavity and improve the service life of the sealing ring. It is suitable for occasions that require dust protection on both sides and oil sealing in the middle For example, it is used to seal water and detergent in washing machines.

The invention discloses a control device and method for a wheel type mechanical hydraulic travelling system. Based on a control unit, state quantities including pressure, rotating speed, electric currents, positions and the like are detected, a first magnetic valve, a second magnetic valve and a third magnetic valve are controlled, besides, a damping device is additionally arranged on a pilot oil line, and too big impact during starting and stopping is avoided. An accelerator pedal and running speed are in real-time matching, so that the maneuvering flexibility is improved, and maneuvering comfort and driving feeling are enhanced; the throttling losses when a running control valve is not fully opened are reduced, energy is saved, and the control response speed is increased; control on manual switch and automatic switch under various travelling operating conditions is realized, the trouble that a manipulator frequently adjusts various travelling modes is reduced, and the operation fatigue feeling is reduced; pressure impact during starting and stopping is reduced, and better comfort is achieved.

A bicycle assembly can include a front or rear suspension system with a shock absorber. A front suspension system can be a suspension fork. A rear suspension system can include a rear shock absorber. The shock can have a shock body and a pressurized main air chamber within the shock body to act as an air spring. The shock can also have a valve configured to receive a pump for adding air to the main air chamber. A secondary air chamber and a control member can be used to reduce the pressure within the main air chamber by venting the secondary air chamber to the atmosphere.

The invention discloses a boom telescoping control method, a boom telescoping control apparatus, a boom telescoping control system and an engineering machine. The method comprises the following steps: acquiring the target telescoping length of a boom; acquiring the current telescoping length of the boom in real time; determining a telescoping control signal according to the current telescoping length of the boom and the target telescoping length of the boom; and outputting the telescoping control signal to an execution mechanism in order to control the boom to telescope. The current telescoping length of the arm is acquired to realize real time adjustment of the telescoping control signal, so improvement of the stability in the boom telescoping process is facilitated, and the pressure impact of a hydraulic system is reduced; and closed loop control is adopted to realize the consistence of the boom telescoping rules under different conditions, so the telescoping efficiency is guaranteed.

An alignment system for aligning the cover and base of an inner pod of a reticle carrier. The cover and base can each be provided with hard planar surface seal zones on the bottom surface and the top surface, respectively. The cover of the inner pod may be provided with a through hole or a blind hole into which an alignment pin is disposed. The base is provided with a guide recess to receive the distal end of the alignment pin. The alignment pin operates to limit contact surface area between the cover and the base during that is in sliding contact, thus inhibiting particulate generation. Low particulate-generating materials, such as stainless steel or polyamide-imide, can also be utilized to further reduce particulate generation. Furthermore, the cover and base can each be unitary without need for fastening components thereto, thereby eliminating clamped surfaces that can entrap and subsequently shed particulates.

The invention relates to a method for controlling the pressure inside a fuel tank of an internal combustion engine of a motor vehicle includes relieving the pressure in the fuel tank when reaching a predetermined upper overpressure threshold value. In a device for controlling the pressure in the fuel tank, the pressure in the fuel tank is only relived partially, wherein the pressure relief is less than 20%, preferably less than 10% and optimally less than 5% of the upper overpressure threshold value in order to reduce the emission of volatile hydrocarbons into the environment.

The invention discloses a system and a method for recycling and reusing the vibration energy of a road roller. In the vibration stop process, a first path formed by a first two-position two-way on-off valve, a two-position four-way reversing valve and a second two-position two-way on-off valve is controlled, and the rotational kinetic energy of a vibrating motor is converted into pressure energy and is accumulated in a high pressure energy accumulator through the first path; a low pressure oil tank, a one-way valve, the second two-position two-way on-off valve, the T end to the A end of the two-position four-way reversing valve, the vibrating motor, the B end to the P end of the two-position four-way reversing valve, the first two-position two-way on-off valve and the high pressure energy accumulator are arranged in the first path in sequence; or, the low-pressure oil tank, the one-way valve, the second two-position two-way on-off valve, the T end to the B end of the two-position four-way reversing valve, the vibrating motor, the A end to the P end of the two-position four-way reversing valve, the first two-position two-way on-off valve and the high pressure energy accumulator are arranged in the first path in sequence; moreover, according to the system and the method, the pressure energy accumulated in the high pressure energy accumulator can be used for the vibration stop process further.

The invention discloses an energy-saving control method for a positive flow control hydraulic system, and belongs to the field of mechanical control. The energy-saving control method is suitable for the positive flow control hydraulic system and includes the steps that a precursor requirement flow is calculated according to a plurality of signals of a precursor handle; the maximum flow of a main pump is calculated according to signals of the main pump; the torque load control amount is output in a PID mode according to the stall value of an engine; the upstream and downstream differential pressure of a valve element is calculated according to upstream pressure and downstream pressure of the valve element and output in a PID mode to serve as the valve element load control amount; the smaller value of the precursor requirement flow and the maximum flow of the main pump serves as a control flow, and the control flow minus the torque load control amount and the valve element load control amount to serve as the final output flow. According to the technical scheme, the match between the discharge capacity and opening characteristics of the valve element is optimized, press loss of the valve element is reduced, and the energy-saving effect is achieved.

A double-cycloid hydraulic motor comprises a output shaft, front and back end caps, a distributing valve, a motor base, internal and external rotors and several pin teeth. The output shaft is connected with the internal rotor each other. The pin teeth disposed between the external and internal rotors are engaged with the external and internal rotors at the same time. Between the internal and external rotors and the pin teeth are formed several independent enclosed tooth cavities, which are in communication with the distributing valve separately and then in communication with the fuel inlet and outlet through the distributing valve.

The invention relates to an undercarriage rising and landing control hydraulic device for a helicopter. According to the hydraulic device, a variable-frequency motor is adopted to control a quantitative hydraulic pump, and the rotating speed of the motor is changed to control the flow of a system, and therefore rising and landing of an undercarriage are achieved. By means of the undercarriage rising and landing system of the structural form, the structure is simple, the installation position is not limited, the requirement for the precision of oil liquid is low, a valve-control throttling speed-adjusting servo hydraulic system is abandoned, the problems that the temperature of the system is increased and the efficiency is low due to throttling losses and overflow losses are avoided, and meanwhile electro-hydraulic servo valves very high in manufacturing cost and electromagnetic reversing valves large in pressure impact are abandoned.

The invention discloses a load-sensitive multi-way valve and a hydraulic system. The load-sensitive multi-way valve comprises a head joint, a tail joint, more than one behind-valve compensation work joint and more than one front-valve compensation work joint; the behind-valve compensation work joints and the front-valve compensation work joints are arranged between the head joint and the tail joint, and the head joint, the tail joint, the behind-valve compensation work joints and the front-valve compensation work joints are fixedly connected; and a P oil supply oil circuit, an X pilot oil supply oil circuit, a Y oil drain oil circuit, a Ls load feedback oil circuit and a T oil return oil circuit pass through the behind-valve compensation work joints, the front-valve compensation work joints and the tail joint from the head joint. According to the load-sensitive multi-way valve integrating the behind-valve compensation work joints and the front-valve compensation work joints, the advantage of front-valve and behind-valve load sensitivity is achieved. The multi-way valve is provided with the behind-valve compensation work joints and the front-valve compensation work joints to achievethe load sensitivity function, the flow control performance is improved, and the host operation controllability is better.

The invention relates to a hydraulic buffer device for realizing safety turn of a hinged vehicle based on a hinged system. The hydraulic buffer device comprises a basic damping oil line and a pressurizing control oil line, wherein the basic damping oil line and the pressurizing control oil line are connected in parallel to form a hinged damping pressure control oil line, an oil return line is arranged between the hinged damping pressure control oil line and an oil storage tank, a second oil absorbing line is arranged between the oil storage tank and a rod cavity, a safety locking oil line is arranged between the rod cavity and the oil return line, and a reversing assembly is arranged in a second oil pressure line. The invention also provides a method for realizing the safety turn of the hinged vehicle by using the hydraulic buffer device. The hydraulic buffer device and the method based on the hinged system for realizing safety turn of the hinged vehicle have the advantages that the vehicle can be easily and quickly turned, so the dragging of the vehicle and the tail throwing of the vehicle after straightening during turning are avoided; meanwhile, when the accident of the vehicle occurs, the shape of the vehicle during accident occurrence is maintained, the larger hazard is avoided, and the application range is wider.

The invention discloses a novel fuel tank wave-proof plate structure, which comprises a wave-proof transverse plate arranged along the length direction of the fuel tank, and a plurality of wave-proofvertical plates oppositely arranged along the height direction of the fuel tank, wherein the plurality of wave-proof vertical plates are mutually connected through the wave-proof transverse plate to form a whole body, the wave-proof transverse plate is provided with a plurality of first through holes. According to the wave-proof plate structure, when the liquid level of the fuel oil is lower thanthe wave-proof transverse plate, the shaking of the fuel oil is blocked by the wave-proof transverse plate, the wave-proof vertical plates can also effectively prevent the shaking of the fuel oil, andthe shaking fuel oil cannot impact the upper surface of the fuel tank; when the liquid level of the fuel oil is higher than the wave-proof transverse plate, the wave-proof transverse plate divides the fuel oil in the fuel tank into an upper part and lower part which are relatively independent, the wave-proof transverse plate and the wave-proof vertical plates can effectively reduce the mutual influence between the fuel oil of the two parts, the shaking energy of the fuel oil above the wave-proof transverse plate is small, the shaking fuel does not form effective impact on the upper surface ofthe fuel tank, and the shaking noise which can be sensed by passengers cannot be generated in the fuel tank. The invention also discloses a fuel tank.

The invention discloses a propeller especially used for an electric hydrofoil surfboard, The structure comprises a spindle, a bearing, a motor, a mounting base, an impeller, a fin, a positioning axlecarrier, a tail wing. the motor is fixedly and fitting connected with the central side wall inside the housing through a side wall buckle plate, the positioning shaft frame comprises a valve seat, a couling part, a guide plate, a connecting shaft, an insert part, A support bracket is driven by an insert to be connected with equipment to consolidate and support the valve seat, The impeller is movably arranged at the front end of the valve seat by the inner groove and the coupling part, and then the rotational speed of the impeller is increased by the rotation of the connecting shaft and the coupling member to reduce the impact of the underwater pressure, and at the same time, a guide plate directs the impeller to maintain the orientation so as to avoid the distortion of the forced bending moment, thereby improving the stable force of a surfboard on the water surface so as to continuously and steadily operate.