172results about How to "Guaranteed damping effect" patented technology

An electro-rheologic vibration absorber with damping continuously adjustable function in air charging type is prepared as embedding columnar electro-rheologic spring and compressing valve as well as drawing valve in piston of said absorber, setting oil channel on piston to let hydraulic oil flow in reciprocation way, using float piston to divide cylinder to be two parts of up oil chamber and down air chamber, setting piston rod to be hollow structure being used to pass wire to be connected with electro-rheologic spring and charging electro-rheologic fluid with apparent viscosity being controlled by externally exerted magnetic field in said spring.

The invention discloses a self-propelled peeping probe adapted to different diameters of drill holes and a peeping method thereof. The probe comprises a peeping probe body, a camera, walking wheels, rocker arms connected to the walking wheels, and an operating host. The rock arms can achieve a certain angle of damping opening and closing under the effects of internal torsion springs and gas springs and have alarm functions, and the rocker arms can be fixed in grooves of a peeping probe side through locking holes and locking blocks. The self-propelled function of the peeping probe in a drill hole can be achieved through an internal power supply, a driving motor, a video processing module, a control module, a WIFI module and the external operating host. The peeping probe has the advantages of centered drill hole, self-propelling and less workers in operation in a drilling peeping operation process, the complexity in a conventional drilling peeping operation is reduced, a push rod and a video transmission line are removed, auxiliary accessories are greatly reduced, and a new solution is provided for determining the fracture of a rock mass through drilling peeping in underground engineering.

The invention discloses a slide valve type variable-damping shock absorber matched with an air spring and a working method thereof. The lower end of a piston rod is fixedly connected to an upper piston head and a lower piston head, the lower end face of the lower piston head is in close contact with an air bag spring, the upper end of the air bag spring is connected with the lower end of a gas conduit, the gas conduit protrudes upwards vertically through a hole in the center of the piston rod to stretch out of a working cylinder and then extends out of the lateral portion of the upper section of the piston rod to be connected with the air spring, a compensation air bag is placed on the bottom of an inner cavity of the working cylinder, four blind grooves are formed in the circumference of the outer wall of a piston sleeve at intervals of 90 degrees, the lower end of each blind groove is communicated with a lower cavity of the working cylinder, a sealed port is arranged between the upper end of each blind groove and the top face of the piston sleeve, several blind groove radial through holes arranged axially are formed in the upper portion of the interior of each blind groove, blind groove axial through holes communicated with the blind grooves and the blind groove radial through holes are formed in the positions of all the sealed ports of the top face of the piston sleeve, four piston sleeve axial through holes are evenly formed in the piston sleeve at intervals of 90 degrees and are located on the same radial positions with the blind groove axial through holes, and then the damping effect is guaranteed.

The invention discloses a double-layer vibration damper with a temperature varying pipeline capable of stretching freely, which belongs to the technical field of vibration damping and comprises a vibration damping bracket used for supporting a pipeline. The vibration damping bracket is fixed on a panel under the vibration damping bracket through symmetrically installed vibration damping bracket supports, and a spring absorber is installed under a panel. The spring absorber comprises a vibration damping spring, a spring vibration damping base plate, a rolling steel ball and a base support. One end of the vibration damping spring is installed on the lower end face of the panel, the other end of the vibration damping spring is installed on the spring vibration damping base plate, and the spring vibration damping base plate is installed on the base support through the rolling steel ball and is capable of rolling on the base support. The double-layer vibration damper enables a pipeline to be arranged in the support of the double-layer vibration damper, moves with the change of the axial size and the radial size of the pipeline and maintains the position of a damping system in the pipeline. The double-layer vibration damper has the advantages of being capable of enabling multiple-dimension size change of the pipeline in the vibration state caused by temperature change to be removed through the rolling steel ball under the double-layer damping system and simple in structure.

The invention provides a viscous damper with a hydraulic fusing function. The viscous damper comprises a cylinder, a piston rod and a piston; the piston is mounted in the cylinder for dividing the cylinder into a first cavity and a second cavity; viscous mediums are filled in the first cavity and the second cavity; and the piston is provided with a first one-way valve for allowing the viscous mediums to flow from the first cavity to the second cavity and a second one-way valve for allowing the viscous medium to flow from the second cavity to the first cavity. The viscous damper has the advantages of high working efficiency and low maintenance cost.

The invention relates to a rotating type viscous fluid damper which comprises an oil cylinder, a front lining, a rear lining, a piston rod, a piston, a damping medium, a sleeve, a pin head and a connecting pipe assembly. A bearing is arranged at the connecting position of the piston and the piston rod in an embedded manner. Multiple clamping grooves are formed in the outer end face of the piston in the direction of the end face of the piston. Blades are fixedly connected in the clamping grooves. The rotating type viscous fluid damper is simple in structure, the blades generate rotating movement under the effect of medium pressure, and therefore the linear movement of the piston rod of the viscous fluid damper is converted into the circular movement, the damping effect of the damper can be well ensured, adjustability of the damping characteristic is achieved, damping medium convection is accelerated at the same time, the radiating efficiency of the damper is improved, and the service life of the product is prolonged.

The invention discloses a centrifugal compressor. A rotating shaft of a motor stretches into a closed cavity of the compressor from a box body to be directly connected with an impeller, and a rotating shaft of the compressor is located in a shell through dual radial bearings. The dual radial bearings enable the rotating shaft to have the advantages of large rigidity, high carrying capacity, less deformation after carrying, stability in operation and the like. The dual radial bearings also adopt three special oil wedge slots to support the rotating shaft, so that the rotating shaft can operate stably in a high-speed rotating process.

The invention discloses a gasbag shock absorber, which comprises a shock absorber main body, a gasbag and a connecting device, wherein the gasbag is arranged on the outer side of the shock absorber main body through the connecting device, the connecting device comprises a support saddle and a connecting plate, the support saddle is sleeved on the shock absorber main body, the connecting plate is closely sleeved on a piston bar which is arranged on the upper end portion of the shock absorber main body, and the two ends of the gasbag are respectively closely sleeved on the connecting plate and the support saddle. Stomata are arranged on the support saddle, and the gasbag is communicated with the external. The gasbag shock absorber has the advantages that the adaptability is strong, the gasbag shock absorber is capable of being suitable for the needs of different roads, the comfort is excellent, the structure is simple, the making cost is low, a gasbag is capable of being further sleeved on the outer side of an original shock absorber main body, thereby being capable of completely separating oil and gas, also completely avoiding the shock absorber and the air generating a reaction in a high temperature to appear an emulsion, and being favorable to guarantee the damping effect of the shock absorber.

The invention discloses a pipe unloading and translation mechanism, and belongs to the field of building material machining mechanical equipment. A reciprocating driving mechanism is vertically fixedon one side of the upper side of a fixed base; a connecting bracket is vertically fixed between the reciprocating driving mechanism and a pushing mechanism; an unloading mechanism is arranged on the upper side of the pushing mechanism; the connecting bracket is horizontally and rotationally connected with an electromagnetic clutch; one end of a one-way clutch on one side of a rotating gear is horizontally arranged in the electromagnetic clutch; a pushing rotating shaft above a pushing bracket is horizontally arranged in the electromagnetic clutch; a damping mechanism is arranged at one end ofthe pushing rotating shaft; pipe pushing support rods are symmetrically arranged on the outer side of a pushing chain; and an unloading mechanism comprises a pipe guide inclined plate, a pipe stop rotating rod, a lower pipe cylinder and a lower pipe baffle plate. The pipe unloading and translation mechanism is reasonable in structural design, can gradually and stably unload pipes, and can flatly shift the pipes as needed efficiently and accurately to meet the machining and use demands.

The invention discloses a bridge damping device, which belongs to the field of bridges. The device comprises a plurality of supporting piers, and the tops of the supporting piers are fixedly connectedwith bridge decks; the bridge decks are in sliding connection with the supporting piers through bolts. Limiting sliding grooves located below the bridge decks are fixedly connected to the left side and the right side of the supporting piers correspondingly, limiting sliding blocks are slidably connected to the inner sides of the limiting sliding grooves correspondingly, rotating hinges are fixedly connected to the lower portions of the limiting sliding blocks, swing connecting rods are fixedly connected to the lower portions of the rotating hinges, and a bearing support is fixedly connected to the middle of each supporting pier. During use, damping is performed through the double damping devices, so that the damping effect is guaranteed; and when the vibration amplitude of the device is large, the swing connecting rods can drive gears to rotate, then first springs are compressed through transmission racks and sliding positioning blocks to conduct primary damping; meanwhile, damping supporting rods and horizontal damping bottom plates compress second springs to conduct further damping, vibration energy is thoroughly absorbed, and bridge safety is guaranteed.

The invention discloses a temperature-controlled intelligent tuned inertial mass damper. The damper is composed of two parts, namely a working cavity temperature control part and a main damper body part. The working cavity temperature control part comprises a temperature monitoring part and a temperature adjusting part. The main damper body part comprises an SMA spring and an inertial mass damperbody connected with the SMA spring through a rack, the rack is connected with a driving gear, the driving gear is in contact with a follow-up flywheel, the follow-up flywheel is connected with a cylinder, and the cylinder is located in a box body filled with viscous liquid. According to the temperature-controlled intelligent tuned inertial mass damper, the inertia force of the damper body can be increased by converting axial motion into rotary motion, and on the premise of ensuring the damping effect, the mass of the damper body is reduced. The damping and stiffness of the SMA spring can alsobe adjusted in real time by changing the temperature, so that the damper body has the stable working performance in a wide frequency domain, and therefore the good damping effect is achieved.

The invention discloses a split type broadband steel rail damping vibration reduction noise reducer. The split type broadband steel rail damping vibration reduction noise reducer comprises a rail webdamping plate, which sticks to a rail web, and clamp springs; the split type broadband steel rail damping vibration reduction noise reducer further comprises a middle adjusting block and a rail bottomdamping vibration reducer; the middle adjusting block is in contact with the rail web damping plate; the bottom damping vibration reducer coats the rail bottom and is in contact with the middle adjusting block; one group of adjusting holes is formed in the contacting surface of the rail web damping plate and the middle adjusting block; limiting projections matched with the adjusting holes are arranged on the middle adjusting block; a sawtooth surface is arranged on the contacting surface of the middle adjusting block and the rail bottom damping vibration reducer; and a toothed surface matchedwith the sawtooth surface is arranged on the rail bottom damping vibration reducer. Through matched coarse adjusting of the limiting projections and the adjusting holes and through fine adjusting ofthe toothed surface and the sawtooth surface, it is guaranteed that the rail bottom damping vibration reducer is in a position between two sleepers; the adjusting mode is convenient and rapid; and moreover, the coordination between the limiting projections and the adjusting holes and the coordination between the sawtooth surface and the toothed surface can effectively prevent the rail bottom damping vibration reducer from jumping so that the vibration reduction effect is guaranteed.

The invention relates to a vibration absorption and insulation integrated device comprising a vibration insulator, a cantilever rod, an adjustable pressing block and a spring. The two ends of the cantilever rod are provided with outer threads correspondingly, the bottom of the cantilever rod and the vibration insulator are connected in a threaded mode and fastened through a positioning nut, and the top end of the cantilever rod is in threaded connection with a locking nut. The middle of the cantilever rod is sleeved with the adjustable pressing block, the adjustable pressing block slides vertically along the cantilever rod, and the device further comprises an upper elastic element and a lower elastic element which are symmetrically arranged on the cantilever rod corresponding to the adjustable pressing block in a sleeving mode. Through integrated design of the vibration insulator and a power vibration absorption device, connection between an auxiliary machine and the vibration absorption and insulation device can be simplified, and the spatial utilization rate can also be sufficiently increased.

The invention provides an elevator in which a damping device will not be stopped and the ride comfort is secured even if a failure occurs to any one of a plurality of acceleration detectors and a plurality of actuators constituting the damping device. The elevator has a pair of guide rails arranged in a vertical direction in a hoist trunk; an elevator car that ascends and descends along the guide rails; a plurality of acceleration detectors that detect vibration of the elevator car; and a control device that controls a plurality of actuators based on the output of the plurality of actuators for suppressing the vibration of the elevator car and the plurality of acceleration detectors, reproduces parameters for generating a control command transmitted to the plurality of actuators when any one of the plurality of acceleration detectors fails, and generates the control command transmitted to the plurality of actuators based on the value of normal acceleration detector in the plurality of acceleration detectors.

The invention relates to suspended mechanical spring in railway carriages for passenger, concrete relates to option processes for suspended mechanical spring in railway carriages for passenger. The invention solves the problem of difficulty in Making sure that carriages for passenger primary pass the test because of lacking of option processes for standard axle box mechanical spring and bolster mechanical spring when carriages for passenger in maintenance. Weighting the body of the carriages for passenger, Gauging partition of load of the four supporting place in the body carriages for passenger, and Ascertaining the heavy end the light end and the heavy side, the light side of the heavy end and the light end according to the partition of load of the four supporting place; gauging the free height and hardness of the vehicle-mounted axle box mechanical spring and bolster mechanical spring, Ordering the axle box mechanical spring and bolster mechanical spring in order of large to small of the product of the free height and the hardness of the mechanical springs; and then optioning in the order of heavy end to light end, heavy side to light side. The invention can reduce the workload of corrective maintenance, improve the success rate of maintenance, essentially make >primary pass the test, and improve maintenance efficiency and quality.

The invention discloses a porous pneumatic damper. The porous pneumatic damper comprises an outer sleeve, wherein the outer sleeve is internally provided with a cavity; a piston is arranged in the cavity; a first sealing element is fixedly arranged at an opening formed in one end of the outer sleeve; first pneumatic damping holes are formed in one end of the outer sleeve; second pneumatic dampingholes are formed in the other end of the outer sleeve; porous medium valve bodies are respectively and fixedly arranged in the first pneumatic damping holes and the second pneumatic damping holes; thepiston is positioned between the first pneumatic damping holes and the second pneumatic damping holes; and a first piston rod is arranged on one side of the piston, penetrates through the first sealing element and penetrates out of the outer sleeve. According to the porous pneumatic damper disclosed by the invention, gases are always changed in the process that the gases enter or exit from the cavity, the heat dissipating effect can be realized on the premise of ensuring the damping effect, and excessive internal temperature rise of the damper is avoided; and a damping medium is natural gas and is independent of liquid media such as silicone oil, so that the problem of reduced damping force caused by excessive temperature rise is avoided.

The invention provides a shock absorber and a vehicle with the shock absorber. The shock absorber comprises a cylinder body, a piston and cooling fins. The cylinder body is provided with a first innercavity which is used for holding shock absorber oil; the piston can be movably arranged in the first inner cavity, and can compress the shock absorber oil; the cooling fins are arranged outside the cylinder body, and are provided with second inner cavities communicating with the cylinder body; and when the piston compresses the shock absorber oil, part of shock absorber oil in the first inner cavity flows into the second inner cavities. The technical scheme provided by the invention effectively solves the problem of poor heat radiation of the shock absorber in the prior art.

The invention discloses a damping device for an exhaust pipe of an automobile, which is arranged between the exhaust pipe and an engine or a speed changer of the automobile. The damping device comprises a damper fixedly arranged on the exhaust pipe and a connecting part; the first end of the connecting part is fixedly connected with the damper; and the second end of the connecting part is fixedly connected with the engine or the speed changer, and a damping part made of a damping material is arranged at the connection of the connecting part and the engine or the speed changer. The damping device for the exhaust pipe of the automobile, provided by the invention, is simple in structure, durable, good in damping effect and capable of being used under the condition that the space is narrow.

The invention discloses a moving coil type actuator for the active suspension of an engine. The moving coil type actuator comprises an end cover, two leaf springs, a permanent magnet, a pushing rod, acoil, a coil bracket, an outer keeper, an inner keeper, a fixed-distance tube, and a fastening sleeve, the outer keeper is arranged on the outer side of the inner keeper, the inner keeper and the outer keeper are mounted on the end cover, a groove is formed in the outer side face of the inner keeper, the permanent magnet is fixedly mounted in the groove of the inner keeper, the fixed-distance tube is mounted between the two leaf springs, and the two leaf springs are connected with the top end and the bottom end of the fixed-distance tube; and the coil is arranged between the outer keeper andthe inner keeper, the coil is connected with the coil bracket, and the coil bracket is fixed on the fixed-distance tube through the fastening sleeve. The moving coil type actuator can effectively solve the problem of excessive mass of a rotor, the response speed of the actuator to the control signal in the actuating process and the stiffness linearity within the excitation amplitude range of the engine are improved, the heat emission capacity of a shell of the actuator is improved, and the service life of the shell of the actuator is prolonged.

The invention discloses an assembly tool for front shock absorbers of a motorcycle. In the assembly tool, a base plate (1) is in a rectangular flat plate structure, a riser pipe (2) is vertically fixed on the upper plate surface of the base plate (1), locating holes (3) are arranged in front of the riser pipe (2) in bilateral symmetry, and the locating holes (3) are rectangular. By using the assembly tool, the front shock absorbers and a steering column can be assembled into a whole before being assembled onto a carriage, thereby achieving the advantages of simple operation, low labor intensity and high efficiency and avoiding the damage of the front shock absorbers in the assembly process. At the same time, the assembly tool can effectively locate the front shock absorbers, ensure that the front sides of the front shock absorbers face right ahead and the left and right front shock absorbers have the same height position, ensure the beautiful appearance, the assembly accuracy and the shock-absorbing effect of the front shock absorbers, and improve the driving safety of the motorcycle.

The invention discloses an iron-based high-damping alloy with high thermal conductivity and a preparation method thereof. The iron-based high-damping alloy comprises the following components in percentage by weight: 6-8% of Cr, 1-2% of Si, 4-6% of Al, 1.5-2.5% of Hf, 4-9% of Cu, 1-2% of B, 2.5-4.5% of Sn, 2-3% of Co and the balance of Fe. The iron-based high-damping alloy with high thermal conductivity has the mechanical property and damping capacity of the traditional iron-based high-damping alloy: the tensile strength is 540-550 MPa, the elasticity modulus is 80-85 GPa, the yield strength is 240-280 MPa, the elongation is 24-32%, and the SDC is 30-34%. On the basis of ensuring the damping capacity and mechanical property of the existing iron-based high-damping alloy for deformation, the thermal conductivity of the alloy is increased to 110-150 W / m.K from about 60-90 W / m.K and the alloy can be applied to occasions of higher temperature and vibration attenuation on a large scale.

The invention discloses a polyurethane microcellular elastomer for an elevator. The polyurethane microcellular elastomer comprises a polyurethane body, a plurality of through holes formed in the polyurethane body, and magnetizable particles which are embedded into one part of the through holes, wherein the polyurethane body is of an anisotropic structure; in the anisotropic structure, the compression modulus in one direction of three orthogonal directions is at least 1.5 times greater than that in the other two directions; a protection layer is laid on the outer surface of the polyurethane body; a plurality of ventilated mesh holes are formed in the protection layer; a separation layer made of waterproof and ventilation materials is arranged between the polyurethane body and the protection layer; the separation layer is provided with a plurality of bulges; a plurality of concave parts are arranged in the protection layer; the bulges are correspondingly clamped into the concave parts one by one. According to the polyurethane microcellular elastomer for the elevator, a condition that a vibration absorption device has fatigue failures in a utilization process of the elevator is avoided, and the vibration absorption effect of the elevator is ensured.

The invention relates to a variable-frequency damping support device for a space camera. The variable-frequency damping support device comprises an upper hinge plate (1), etc. The upper hinge plate (1) and a lower hinge plate (10) are respectively connected with outer connecting rods (an outer connecting rod I (2) and an outer connecting rod II (3)) and an inner connecting rod (7) through joint bearings (5) and pin shafts (6). Damping rubber layers (8) are filled among the outer connecting rod I (2), the outer connecting rod II (3)) and the inner connecting rod (7), controllable structure gaps are manufactured among the outer connecting rod I (2), the outer connecting rod II (3)) and the inner connecting rod (7) by virtue of division plates (9) and rigidness rubber layers (11), and finally the variable-frequency damping support device realizes supporting for the camera. By the gap design, the camera can show the variable-frequency properties of three different frequencies under low-order vibration, launching segment vibration and on-orbit gravity-free condition, the large damping effect is ensured, and the problem of influence of on-orbit micro-vibration of a satellite structure on camera imaging is solved.

The invention discloses a multifunctional fire extinguisher with a damping base. The multifunctional fire extinguisher with the damping base comprises a fire extinguisher barrel body, a pressure materand a spraying pipe; a lifting handle is arranged above the fire extinguisher barrel body; a pressing handle is arranged above the lifting handle, and is provided with a safety pin; the pressure matter is installed in front of the pressing handle; a siphon and a powder fire extinguishing agent are arranged in the fire extinguisher barrel body; the spraying pipe is fixedly connected with the fireextinguisher barrel body through a jetting hose; the fire extinguisher barrel body is provided with a hose fixing belt; the jetting hose is fixed to the fire extinguisher barrel body through the hosefixing belt; and a steel plate is fixedly connected with the damping base through a damping spring. The multifunctional fire extinguisher with the damping base is scientific and reasonable in structure and safe and convenient to use, the using safety coefficient of the fire extinguisher is increased, the pressure meter is used for monitoring the pressure condition in real time, and a smoke alarming device is added and plays a fire alarming role.

The invention discloses a high-damping lithium-magnesium alloy containing dual phases alpha and beta and a processing technology thereof. The high-damping lithium-magnesium alloy is prepared from, by weight, 6.0-10.0% of Li, 1.0-4.0% of Bi, 0.6-3.2% of In, 0.1-0.3% of Y, 0.1-0.4% of W, 0.1-0.2% of Se, 0.1-0.2% of V and the balance magnesium. The high-damping lithium-magnesium alloy contains the dual phases. The material has the mechanical properties of traditional lithium-magnesium alloy: the elastic modulus is 50.70 GPa, the yield strength is 90-120MPa, the tensile strength is 140-160 MPa, and the elongation percentage is 6-18%. The high-damping lithium-magnesium alloy has the high damping performance which the traditional lithium-magnesium alloy does not have, SDC = 40-45%, while the SDC of the traditional material is about 30%. The alloy is subjected to induction smelting under the protection of argon, a smelting processing method is simple, and the production cost is lower. While the damping performance is ensured, the service life of the alloy is further prolonged, and large-scale industrialized application is facilitated. The high-damping lithium-magnesium alloy can be used for manufacturing structural parts with the use temperature of 100 DEG C or below and have a very remarkable damping effect.

The invention discloses a damping sleeve for metal pipe vibration and noise reduction and a coating method. The damping sleeve (1) with the thickness of T is in a more-than-one-half cylinder shape and made of rubber materials. A plurality of cavity holes (2) are formed in the outer surface of the damping sleeve (1). Redundant parts of the two damping sleeves (1) are cut off in the 45-degree direction of the axis to enable the two damping sleeves (1) to define a whole circle and form a pairing damping sleeve. The inner wall of the paring damping sleeve and the outer wall of a metal pipe are evenly painted with glue, the pairing damping sleeve coats the outer wall of the metal pipe, joint closing is carried out on the pairing damping sleeve in the 45-degree included angle direction, then the pairing damping sleeve is wound and tightly tied up through woven belts, and the woven belts are removed after the glue is completely solidified. The thick pairing damping sleeve coats the metal pipe, the impedance sudden change is formed between the metal pipe and the pairing damping sleeve, therefore, vibration energy can be absorbed through the cavity holes in the pairing damping sleeve when vibration is generated on the metal pipe, and the vibration noise of the metal pipe is reduced.

The invention provides an eddy current three-dimensional damping device. The damping device comprises a box body, a connecting screw hole A, a rotary shaft, a torsion spring, an outer layer sphere, amiddle layer sphere, an inner layer sphere, an additional mass block A, an additional mass block B, a connecting screw hole B, an inner layer sphere fan blade, an inner layer sphere base, a middle layer sphere fan blade, a middle layer sphere fan blade, an outer layer sphere fan blade, and an outer layer sphere base. Firstly when the structure vibrates, a TMD damper composed of the additional massblocks, the torsion spring and all the spheres conducts energy transferring to reduce structural vibration; and secondly, in the work process of the TMD damper, energy is dissipated through eddy current damp generated by relative movement of a conductor and a permanent magnet. According to the eddy current three-dimensional damping device, through nesting of the spheres, three-dimensional movement of the additional mass blocks is achieved; through arrangement of different spherical materials and by utilizing the eddy current damp, the energy is dissipated, and multi-dimensional damping is achieved; and by adjusting the rigidity of the torsion spring and the mass of the additional mass blocks, the used frequency range of the damping device can be adjusted.

Provided is a photovoltaic parallel inverter system having shared capacitor topology. The system comprises a plurality of paths of photovoltaic grid-connected inverter units. Each path of photovoltaic grid-connected inverter unit is connected in series with an independent AC output LC filter unit to form a branch; the plurality of branches are connected in parallel, and the output ends thereof are connected with a shared capacitor unit; the output end of the shared capacitor unit is connected with a power grid; and the LC filter output by each branch and a filter capacitor of the shared capacitor unit and an equivalent inductor at the power grid side form an LCCL filter structure. Since the capacitor of the shared capacitor unit is connected in parallel with the filter capacitor of each branch, the system, on the whole, is still an LCL filter structure; the product of the inductance and capacitance of the AC output LC filter unit is equal to the product of the inductance at the power grid side and the capacitance of the shared capacitor unit, that is, the product of the inductance and the capacitance at the inverter side is equal to the product of the inductance and the capacitance at the power grid side; and the resonant frequency of the LCL filter structure does not change with the number of the branches.