228 results about "Fuel filter" patented technology

The utility model belongs to the technical field of filters, and relates to a top-mounted fuel filter, which comprises a shell, an oil inlet, an oil outlet and an exhaust oil return hole arranged at the bottom of an inner cavity of the shell; the exhaust pipe is in threaded connection with the exhaust oil return hole and extends upwards in the axial direction of the shell; the filter element assembly is installed in the shell, the exhaust pipe extends to an upper end cover of the filter element assembly along an inner hole of the filter element assembly, and the outer circumferential surface of the upper end of the exhaust pipe is in sealing fit with the inner wall of the inner hole of the upper end cover; the upper cover is in threaded connection with the shell, and the upper cover is in sealing fit with the shell; the filter element assembly further comprises an upper end cover protective cap and a felt ring, and a main exhaust hole is formed in the center of the upper end cover. The filter not only can effectively solve the gas collection phenomenon and enable an engine to operate more stably, but also can reduce the cost of replacing the filter element during maintenance as the exhaust pipe is designed and mounted on the shell.

A fuel filtering system comprising a fuel filter having an input, an output and a washing path. The fuel filter may be cylindrical in shape. The system further comprising a bypass valve having an input from the washing path, and a drain, wherein when the cylindrical fuel filter has a pressure drop from the input to the output, the bypass valve opens to permit cleaning of the filter by allowing fuel to flow from the washing path to the drain. The bypass valve comprises a spool, a valve seat and a spring that has a spring rate (Sk). The output is may be provide through an input to the bypass valve, behind the spool.

The application discloses a kind of high-pressure fuel filter prediction model construction method and flow prediction method, including two prediction models, method specifically includes: using computational fluid dynamics method carries out fluid dynamics simulation calculation to high-pressure fuel filter, constructs working condition sample data set;The size of filter hole, quantity, filter working pressure, fuel viscosity and filter pressure drop are used as input variable, and filter flow is used as output variable, two new high-pressure filter general nonlinear flow prediction models are established using artificial neural network and regression prediction method respectively, the flow characteristics of different models of filter in working interval can be accurately predicted using the neural network prediction method proposed in the application at any working condition point, and the error is low;The flow of different models of filter under different conditions can be quickly and accurately obtained, the accuracy meets the engineering needs, while greatly shortening the experimental time and calculation time, saving design cost.

The present invention discloses a highly integrated intelligent fuel filter, belonging to the technical field of automotive fuel filtration systems. The fuel filter of the present invention is equipped with an intelligent drainage system, an intelligent oil pumping system, and an intelligent heating system to achieve automatic drainage, exhaust, and heating. A drainage controller is provided to automatically control the intelligent drainage system, the intelligent oil pumping system, and the intelligent heating system, thereby improving the automation level of the fuel filter and, in turn, enhancing the end-customer experience. The intelligent oil pumping system of the present invention can also assist in oil delivery and the intelligent heating module can also assist in fuel heating during engine startup. The intelligent oil pumping system and intelligent heating system of the present invention can also alleviate the problem of difficult engine starting in extreme environments.

The utility model discloses a novel base structure of an aluminum cover plate of a fuel filter, and relates to the technical field of fuel filters. The cover plate comprises a cover plate body, an oil inlet pipe and a sealing assembly, the oil inlet pipe is fixed to the center of the top end of the cover plate body, a plurality of outer sealing grooves are formed in the upper portion of the peripheral side of the oil inlet pipe, a plurality of inner sealing grooves are formed in the upper portion of the inner wall of the oil inlet pipe, and sealing rings are fixed in the outer sealing grooves and the inner sealing grooves. A sealing assembly is fixed to the inner top of the cover plate body. By arranging the cover plate main body, the oil inlet pipe and the sealing assembly, the problems that the aluminum cover plate base structure of the fuel filter needs to be matched with an additional sealing structure for installing a connector of an oil conveying pipeline, installation is not convenient enough, and the aluminum cover plate base structure can be loosened due to vibration along with work are solved; the aluminum cover plate base structure has the advantages that the aluminum cover plate base structure of the fuel filter is provided with a connector of an oil conveying pipeline, sealing is more convenient, and the aluminum cover plate base structure cannot loosen due to vibration.

The invention relates to the technical field of fuel filters, in particular to a fuel filter sealing structure which comprises a filtering mounting cover, a precipitation cup is mounted on the filtering mounting cover, a filtering mechanism is mounted on the filtering mounting cover on the inner side of the precipitation cup, and the filtering mechanism is used for filtering impurities in fuel; and a limiting mechanism is mounted on the precipitation cup, is used for sealing the joint of the precipitation cup and the filtering mounting cover and is also used for positioning the mounting position of the filtering mechanism on the filtering mounting cover. The fuel oil filter effectively solves the problems that due to vibration of a vehicle, the structure of an existing fuel oil filter is loosened, sealing failure is caused, and the filtering efficiency is reduced.

1. Name of the designed product: mounting bracket (for mine wide-body dump truck). 2. Use of the designed product: used for assembling primary and secondary fuel filters and fuel electrically controlled reversing valve. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view 1.

The utility model relates to a fuel filter, which belongs to the technical field of fuel filtration and comprises a filter tank, a filter cooling mechanism is arranged in the filter tank and comprises a feed pipe fixedly mounted at the top of the filter tank, and a flow guide seat is fixedly mounted at the bottom of the filter tank. And a fixed plate is fixedly mounted in the filter box. According to the fuel oil filtering machine, fuel oil is fed into the filtering box through the feeding pipe, then the fuel oil is preliminarily filtered through the filtering plate, the fuel oil is extracted through the liquid extraction pump, and the fuel oil is fed into the left side of the partition plate through the circulating pipe, so that the fuel oil is fed into the filtering and permeating layer through the circulating pipe, and the fuel oil is filtered and purified again through the filtering and permeating layer; and finally, the fuel oil can be fed into the cooling pipe, the fuel oil in the cooling pipe can be rapidly cooled through cooling liquid in the cooling box, after the fuel oil is filtered and cooled, the filtering box can be opened, garbage impurities in the filtering box can be taken out, and recycling is convenient.

The utility model discloses a protective fuel filter, which relates to the technical field of fuel filters, and comprises a filter, the outer wall of the filter is sleeved with a clamp piece, one end of the clamp piece is provided with a first screw in a penetrating manner, and the outer walls of the two ends, penetrating through the clamp piece, of the first screw are in threaded connection with first nuts. The filter is installed on a vehicle through matched use of the clamp piece, the back-mounted piece, the first screw rod and the first nut, and the clamp piece is modified, so that the clamp piece can be assembled by matching the second screw rod and the second nut with the through cavities in the two inner receiving pieces; by means of the structure, the aluminum outer cover at one end of the inner receiving piece can achieve the sleeving protection effect on the outer wall, except for the position of the clamping piece, of the filter, the problem that the filter is scratched and broken due to the fact that outside sundries are splashed in the vehicle running process is solved, the protection effect is effectively achieved, and the filter is convenient and fast to install and capable of being repeatedly used.

The utility model discloses an all-plastic visible fuel filter, and mainly relates to the field of filters. Comprising a seat body and a shell which are of a full-plastic assembly, one end of the shell is of a closed structure and forms a precipitation cavity, the other end of the shell is fixedly matched with the seat body, the shell is a full-transparent assembly, a filter material is arranged in the shell, a mounting table used for fixing a filter is arranged on the seat body, and the filter is arranged on the mounting table. A mounting hole position penetrating through the mounting table is formed in the mounting table, a metal supporting piece corresponding to the mounting hole position is inserted into the mounting hole position, first weight reduction grooves are formed in the two sides of the mounting table, a second weight reduction groove is formed in the bottom face of the mounting table, and the first weight reduction grooves and the second weight reduction groove are arranged in a staggered mode in the horizontal direction. The beneficial effects of the utility model are that: it is clear at a glance to the inside filter material condition, the ponding condition and the impurity condition, realizes the characteristics of visualization, difficult corrosion, light weight.

The utility model discloses a forklift fuel oil system suitable for a severe cold environment, which comprises a power component, and the power component generates heat during operation; the heating assembly is arranged in the power assembly, and the power assembly and the heating assembly form a circulating water path; the fuel oil filtering assembly is arranged in the power assembly, the heating assembly is arranged on the periphery of the fuel oil filtering assembly, and water flow for cooling the power assembly enters the heating assembly through the water path so as to form a temperature rising area on the periphery of the fuel oil filtering assembly. According to the utility model, the power assembly capable of actively generating heat and the heating assembly form the circulating water path, and the circulating water path can transfer waste heat generated by the power assembly to the fuel oil filtering assembly, so that the temperature of the working environment is improved; therefore, the filtering effect of the fuel filter in a severe cold environment can be improved under the condition of no extra fuel loss, and the output power efficiency of fuel is improved.

The utility model relates to a sealing rubber sleeve assembling device of a fuel filter, which comprises a machine frame, a positioning seat is arranged on the machine frame, and a positioning groove matched with the outer contour of the fuel filter is arranged on the upper end face of the positioning seat. Three material pushing assemblies are arranged on the machine frame and correspond to an oil inlet pipe, an oil outlet pipe and an oil return pipe of the fuel filter respectively, each material pushing assembly comprises a material pushing block and a material pushing electric cylinder, the material pushing block is provided with a material containing groove which is matched with a sealing rubber sleeve and can be used for containing the sealing rubber sleeve, and the material containing grooves penetrate through the material pushing block in the direction close to the positioning base. The material pushing electric cylinder is arranged on the rack, and an output shaft of the material pushing electric cylinder faces the positioning base and is fixedly connected with the material pushing block. According to the sealing rubber sleeve assembling device of the fuel filter, assembling operation of a sealing rubber sleeve is completed through the material pushing assembly, manpower is saved, and efficiency is improved.

The invention provides a fuel filter and a vehicle, and the fuel filter comprises a central pipe which is provided with a water repelling section and a water collecting section; the filter element is arranged outside the central pipe in a sleeving manner, and the filter element is respectively communicated with the water repelling section and the water collecting section; the water collecting cup is connected to the bottom of the central pipe, and the water collecting cup communicates with the water collecting section; the heater is arranged in at least one of the water repelling section and the water collecting section, and the heater is used for heating oil bodies on the dirty oil side and the clean oil side of the filter element. According to the scheme, the heater is integrated in the center pipe, the internal space of an engine compartment does not need to be occupied, a power source of the fuel filter can be utilized, the circuit layout of the heater is simplified, and then the manufacturing cost is reduced.

The invention provides a stop device for abnormal fuel oil return of a fuel injection pump of a diesel engine, which comprises an oil return stop valve, the oil return stop valve comprises a valve body and a valve core in the valve body, one end of the valve body corresponding to the valve core is provided with a control cavity, the other end of the valve body is provided with an elastic control piece, and the valve body corresponding to the control cavity is provided with a filter oil return port butt joint hole. A stop piece is arranged on the side, close to the valve element, of the control cavity, meanwhile, an oil inlet and an oil return opening are formed in the positions, corresponding to the valve element, of the valve body, and in the normal state, the valve element is pressed by the elastic control piece and abuts against the stop piece, so that the oil inlet and the oil return opening are not communicated. The oil return stop valve controlled by diesel oil pressure is additionally arranged in the oil return pipe, opening and closing of the oil return stop valve are controlled by oil outlet pressure of the fuel filter, cost rise caused by improvement and change of the oil sprayer is effectively reduced, and the requirement for generalization is met. Return oil of the fuel filter directly returns to the inlet end of the low-pressure diesel pump, so that the problem of backflow of the outer oil tank due to high liquid level during parking is effectively solved.

Oil or fuel filter device (10) for filtering fuel or oil of an internal combustion engine, comprising a connecting device (14) for connecting a functional component (12) to a filter housing (16), wherein the connecting device (14) comprises: - a guide section (18) of the functional component (12); - a guide section counterpart (20) of the filter housing (16) which can be joined with the guide section (18) in such a way that the guide section (18) is rotatable about an axis of rotation (28) relative to the guide section counterpart (20), wherein the guide section (18) is fixed radially to the axis of rotation (28) relative to the guide section counterpart (20); - a holding device (40) which has corresponding holding components (42, 44, 46) on the functional component (12) and on the filter housing (16) and which can be activated and deactivated by rotating the guide section (18) relative to the guide section counterpart (20) about the axis of rotation (28) and which, in the activated state, fixes the guide section (18) axially to the axis of rotation (28) relative to the guide section counterpart (20); - a snap-action device (50) which has corresponding snap-action components (52, 54) on the functional component (12) and on the filter housing (16) and which can be activated by rotating the guide section (18) about the axis of rotation (28) relative to the guide section counterpart (20) and which, in the activated state, fixes the guide section (18) circumferentially with respect to the axis of rotation (28) relative to the guide section counterpart (20), wherein the holding device (40) and the snap-action device (50) are activated or deactivated in the same rotational positions of the guide section (18) relative to the guide section counterpart (20), wherein the functional component (12) is a sensor, characterized in that the holding device (40) has at least one holding wing (42) extending radially and partially circumferentially with respect to the axis of rotation (28) and at least one holding hook (44, 46),which, in the activated state of the holding device (40), engages the holding wing (42) and fixes it axially to the axis of rotation (28), wherein the holding wing (42) can be rotated in and out of the holding area of ​​the holding hook (44, 46) by rotating the guide section (18) relative to the guide section counterpart (20), wherein the holding wing (42) is arranged on the functional component (12) and the holding hook (44, 46) is arranged on the filter housing (16).

The utility model provides an electronic fuel injection motorcycle oil supply system structure which comprises an oil tank bottom plate, bottom plate supports are fixedly installed on the two sides of the top end of the oil tank bottom plate, a U-shaped fixing support is fixedly installed at the top ends of the two bottom plate supports, and an oil supply oil tank is arranged in the middle of the oil tank bottom plate. A fixing assembly is arranged between the oil supply tank and the U-shaped fixing support, a fuel pump is fixedly installed on the top of the oil supply tank, and the fuel pump is fixedly connected with an air throttle through a forming oil pipe. The high-pressure oil pipe of the fuel pump is connected with the gasoline filter through the forming pipe, and the gasoline filter is connected with the engine air throttle oil injection device, so that compact arrangement is achieved, the fuel filter is installed between the oil tank and the air throttle, the fuel filtering function is more convenient to achieve, and the fuel pump is more convenient to use. The formed oil pipe is fixed on the U-shaped fixing support through the oil pipe line clamp and the I-shaped rubber sleeve, and the effect of preventing the formed oil pipe from being abraded is achieved.

A fire and protection system designed to provide fire protection / heat shielding for fuel filter clear bowls to pass a fire test as required by ABYC standards. The fire and protection system comprises a backplate and a clear fuel filter bowl shield.

The utility model discloses a fuel filter assembly, and relates to the technical field of motor vehicles. The device comprises a main body assembly and a fixing assembly, the main body assembly comprises a filter cartridge and a filter element, the filter element is fixedly connected with the filter cartridge through the fixing assembly, the bottom end of the filter cartridge is communicated with an output pipe, and the top end of the filter element is provided with an oil pump plug and an oil pipe; the fixing assembly comprises an embedding groove formed in the top end of the filter cylinder, an embedding piece matched with the embedding groove is further fixed to the top end of the peripheral side of the filter element, and an inner groove is further formed in the top end of the filter cylinder. Through the arrangement of the fixing assembly, when the filter element is installed, the embedding piece is aligned with the embedding groove to be inserted into the embedding groove, and the arc surface of the embedding piece extrudes the limiting piece, so that the elastic piece is elastically deformed; after the embedding piece is completely inserted, the elastic piece is reset to drive the limiting piece to clamp the outer side of the embedding piece, so that the radial fixation of the filter element is realized, and the problems that the filter element and the filter cartridge are mostly connected through bolts and the mounting and the dismounting are relatively complicated in the existing scheme are solved.

A method of installation and kits for replacing a lock ring securing a fuel pump to a gas tank and a kit for replacing a fuel supply system of an automotive vehicle. The kit for replacing the lock ring including a circular body having a plurality through bores and a plurality of self-tapping fasteners. The kit for replacement of a fuel supply line including a fuel filter having circular beads on the inlet and outlet. The kit further including a pair of quick disconnect fittings for engaging the beads of the fuel filter.

The utility model discloses a dismounting device for an aircraft fuel filter, which relates to the technical field of aircraft maintenance tools, and comprises a guide rod, a sliding weight block, an elastic piece, a connecting piece and a hook piece, one end of the guide rod is provided with a first limiting block, and the other end of the guide rod is connected with a second limiting block; the sliding weight block is arranged between the first limiting block and the second limiting block and can slide relative to the guide rod; the elastic piece is arranged on the guide rod in a sleeving mode and arranged between the sliding weight block and the second limiting block. The connecting piece is detachably connected to the guide rod and arranged on the side, away from the first limiting block, of the second limiting block. The hook piece is detachably connected to the connecting piece and used for hooking a handle of the fuel filter. According to the dismounting device, through mutual cooperation of the guide rod, the sliding weight block and the hook piece, the sliding weight block impacts the first limiting block, the fuel filter can be gradually withdrawn from the fuel hole, and thus dismounting of the fuel filter is completed.

The fuel filter comprises a top cover and a tank body, the top cover is connected to the top of the tank body in a threaded mode, a fixing frame is fixedly connected to the position, close to the bottom, in the tank body, a second installation groove is formed in the top of the fixing frame, and a first installation groove is formed in the position, located in the center, of the bottom of the top cover. A first mounting groove and a second mounting groove are formed in the tank body, a filter element is mounted between the first mounting groove and the second mounting groove, the filter element is clamped by the top cover and the fixing frame, a scraping assembly for cleaning the inner wall of the tank body is arranged in the tank body, an oil inlet is integrally formed in the top of the top cover, and the oil inlet is communicated with the first mounting groove. According to the fuel oil filter, the filter element can be conveniently and independently replaced, resource waste is reduced, cost is saved, the recycling rate of the fuel oil filter is improved, dirt adhering to the inner wall of the tank body can be scraped and cleaned, and therefore the dirt adhering to the inner wall of the tank body can be reduced, and the service life of the filter element is prolonged.

In an electromagnetic fuel injection valve (I), when a fuel filter (20) and an orifice member (21) are press-fitted onto an inner peripheral surface of the fuel inlet cylinder part (7), interference between press-fit tolerances of the fuel filter (20) and the orifice member (21) is prevented, and reliable press-fitting fixation is ensured. A first press-fitted cylindrical surface (23) onto which the fuel filter (20) is press-fitted, and a second press-fitted cylindrical surface (24) contiguous with an outer end of the first press-fitted cylindrical surface (23) via a stepped part (25) and having a larger diameter than that of the first press-fitted cylindrical surface (23) and onto which the orifice member (21) is press-fitted are formed on the inner peripheral surface of the fuel inlet cylinder part (7).

A fuel filter for a fuel system of an internal combustion engine, preferably for filtering fuel of the diesel type. A fuel filter extends along a filter axis, comprising: a filter medium having a substantially tubular shape through which a fuel can pass in a radial direction when filtered to filter out unwanted components in the fuel and separate the fuel from water; a filter housing comprising a filter chamber adapted to receive a filter medium wherein the filter housing comprises a bottom shell and a top shell, the bottom shell and top shell comprising respective cylindrical sidewalls. The top shell includes: a central opening defined by an opening edge; a planar top wall extending substantially orthogonal to the filter axis starting from the opening edge; and a connecting portion extending between the planar top wall and the cylindrical side wall. The connecting portion includes at least one planar connecting wall. The fuel filter and particularly the top shell are suitable for bearing high pressure, and the fuel filter is a simple component with low production cost.

The invention relates to the technical field of motorcycles, and discloses a modular integrated motorcycle fuel supply system which comprises a fuel tank, a pump body is arranged in the fuel tank, a fuel filter, a fuel pump and a fuel injector are arranged at the bottom of the fuel tank, and the fuel filter, the fuel pump and the fuel injector are all arranged in a motorcycle shell. A fixing mechanism is arranged outside the fuel filter, fuel inlets and fuel outlets of the pump body, the fuel filter, the fuel pump and the fuel injector are fixedly connected with quick-release heads, oil pipes are sequentially arranged between the quick-release heads, and clamping heads are fixedly connected to the two ends of each oil pipe. Clamping force is continuously provided for the first S-shaped clamping plate and the second S-shaped clamping plate through the second spring, the fuel filter can be automatically and firmly fixed in a motorcycle shell, bumping and vibration in the running process are effectively absorbed, the stability of the fuel filter is guaranteed, meanwhile, the opening of the fuel filter is of an outwards-expanded pincerlike structure, and therefore the fuel filter is more stable. And during disassembly, the filter can be taken out only by opening the clamping plates outwards.

Device (50) and method for controlling a fuel filter heating device (80) of a vehicle, wherein the device (50) comprises: a processor (100), an input unit (200) connected to the processor (100), wherein the input unit (200) is configured to receive vehicle-related information (CD), and a memory (300) connected to the processor (100) which is configured to store setting data (SD).The processor (100) comprises: a first control unit (110) configured to determine a heater-on condition based on vehicle-related information (CD) and setting data (SD) stored in memory (300) and to control a switch-on operation for a fuel filter heater (80) of a diesel vehicle when the heater-on condition is met; and a second control unit (120) configured to determine a heater-off condition based on vehicle-related information (CD) entered via the input unit (200) and setting data (SD) set taking into account a cloud point (CP) of diesel fuel and stored in memory (300), and to control a switch-off operation for the fuel filter heater (80) when the heater-off condition is met.

The utility model relates to the field of cleaning devices, in particular to an automobile fuel filter cleaning device which comprises a cleaning barrel, a protective net, a water flow assembly, a control assembly, a positioning assembly, a flushing nozzle and a telescopic rod. A protective net used for preventing the automobile fuel filter from falling to the bottom of the cleaning barrel is installed in the middle of the inner side of the cleaning barrel. By arranging the control assembly, the function of controlling the fuel filter to ascend, descend and rotate is achieved, the fuel filter enters the cleaning barrel so that cleaning liquid can evenly cover the surface of the whole filter, meanwhile, the water flow assembly at the lower end begins to rotate, impact of water flow and the chemical effect of cleaning agent are generated, and the cleaning effect is improved. The outside and the inside of the fuel filter are thoroughly cleaned, sanitary dead angles are avoided, water columns annularly distributed through the flushing spray heads are used for flushing when entering or moving out, the cleaning difficulty of the fuel filter is reduced, and the cleaning quality is improved.

The utility model discloses a combined filter element gasoline filter which comprises an outer pipe, the upper end and the lower end of the outer pipe are respectively provided with a top cover and a bottom box, the inner side wall of the bottom end of the outer pipe and the outer side wall of the top end of the bottom box are respectively provided with a connecting side wall, the connecting side walls are mutually meshed and fixed through thread structures, and a mounting plate is fixed in the inner side wall of the bottom box. A spring is fixed in the middle of the top end of the mounting plate, a positioning frame is fixed in the middle of the outer pipe, the positioning frame is of a hollow cavity structure without a surface at the top end, an internal filter element structure can filter and distribute liquid entering the cavity from a bottom oil inlet, and the liquid entering a filter element can flow out from an oil outlet pipe; when the device is used, the detachable function between the outer pipe and the bottom box is convenient for a user to check and replace the gasoline filter after a certain time, and the threaded connection mode is adopted, so that the field operation and use are convenient, and the functional requirements are met.

The present application provides a fuel-water separation filter element and a fuel filter. The filter element includes a fuel duct, a water blocking tube, and a filter medium. An upper cover plate is connected to one end of the fuel duct. The upper cover plate is formed with an air collection cavity in the fuel duct. The water blocking tube is provided with a water blocking portion positioned in the fuel duct, and a vent pin axially extends from an end surface of one end of the water blocking portion. The vent pin respectively communicates with the air collection cavity and the outside. During operation of the filter element in the present application, gas mixed into a fuel supply system may be effectively exhausted.

A method of installation and kits for replacing a lock ring securing a fuel pump to a gas tank and a kit for replacing a fuel supply system of an automotive vehicle. The kit for replacing the lock ring including a circular body having a plurality through bores and a plurality of self-tapping fasteners. The kit for replacement of a fuel supply line including a fuel filter having circular beads on the inlet and outlet. The kit further including a pair of quick disconnect fittings for engaging the beads of the fuel filter.

The invention relates to the related technical field of welding equipment, and discloses intelligent welding equipment for fuel filter machining, which comprises an operation table, a frame body is arranged on the upper side of the operation table, a driving mechanism is arranged in the frame body, a laser welding machine is arranged on the driving mechanism, a protective cover is arranged outside the laser welding machine, and a movable ring is slidably arranged at the lower part of the protective cover. An annular piece is arranged at the lower end of the movable ring, and an air exhaust assembly is arranged in the protective cover; the protective cover, the movable ring, the annular piece and the workbench can be used for protecting the periphery of the laser welding machine, the situation that waste gas generated by the laser welding machine overflows into air is reduced, and the situation of air pollution is prevented; and then a movable plate moves downwards to drive a plurality of gas frames to move downwards, so that a plurality of first one-way valves are gradually close to the welding position of the laser welding machine, the effect of absorbing waste gas in a short distance is achieved, and a large amount of waste gas generated at the welding position of the laser welding machine can be rapidly absorbed.