62results about How to "Play a role in pressure relief" patented technology

The invention provides a grouting treatment method for a broken water-rich section of a diversion tunnel in a karst area. The method includes the following steps: S1) conducting geological explorationon the broken water-rich section of surrounding rock with water inrush to determine a major runoff path of fissure water and / or groundwater; S2) drilling a drainage hole from a tunnel wall of the broken water-rich section of the surrounding rock to the runoff direction of the fissure water and / or the groundwater in the surrounding rock for drainage of the fissure water and / or the groundwater; S3)drilling grouting holes at preset distance along the radial and circumferential directions of the tunnel wall of the broken water-rick section of the surrounding rock and inserting a grouting pipe into each grouting hole; S4) injecting grouting liquid into the surrounding rock through the drainage hole and the grouting pipes to form a water stop curtain circumferentially in the surrounding rock of the tunnel wall. According to the method, a better grouting treatment effect is achieved, the engineering safety is ensured, and the groundwater resource pollution is reduced.

A noise-reducing range hood comprises a draught fan, a draught fan housing and an exhaust fume collecting hood arranged under the draught fan housing. The draught fan comprises a volute, a vane wheel and a motor used for driving the vane wheel, the volute is provided with a volute back side plate and a volute front side plate, and a current collecting ring is installed at an air inlet of the draught fan. The noise-reducing range hood is characterized in that the air inlet is a back air inlet formed in the volute back side plate, a diversion cone is installed on the current collecting ring, the diameters of the diversion cone are gradually increased in the air inlet direction, and the motor is located on the back side portion of the vane wheel and directly faces the diversion cone. Compared with the prior art, the noise-reducing range hood has the advantages that a back side air inlet mode is adopted by the noise-reducing range hood, the diversion cone is installed on the current collecting ring, the motor is arranged on the back side portion of the vane wheel and directly faces the diversion cone, the diversion cone not only can play the role of reducing noise at the air inlet, but also can block the motor so as to avoid the influence, caused by the motor, to the back air inlet mode, and therefore the vane wheel can be disassembled from the front side, and later-stage maintenance of the motor and volute cleaning can be conducted conveniently.

The invention discloses a noise reducing impeller and a range hood applying the impeller. The noise reducing impeller is provided with a noise reducing hole in a front side blade of a middle disc; a fan intake port of the range hood is a back intake port formed in a volute back side plate; a volute front side plate is provided with a front ventilation port communicated with a fan exhaust port; the front ventilation port and the back intake port are separated through the middle disc of the noise reducing impeller; and a noise reducing cavity communicated with the front ventilation port is formed in front of the fan or in front of and below the fan. The noise reducing impeller is provided with the noise reducing hole in the front side blade of the middle disc for reducing the operation noise; in addition, the range hood adopts a back side intake mode, and the noise reducing cavity is formed in the front side of the fan, so that lampblack can be prevented from sucking by the front ventilation port from the lower side of a hood, the disordered flowing noise of air currents in the front side space of a fan cover is eliminated, and meanwhile, the path of outwards propagating the noise through the front side of the fan cover can be stopped; and under the condition of high resistance of a public flue, the noise reducing cavity also can achieve a pressure relief effect.

The invention discloses a cut blasting optical design method under a high crustal stress condition. The cut blasting optical design method is characterized by comprising the following steps: 1) determining the direction of maximal main stress on a tunnel face and the direction of minimal main stress on the tunnel face; 2) designing a rhomboid cut blasting hole according to the direction of the maximal main stress and the direction of the minimal main stress, wherein the rhomboid long diagonal line is the same as the direction of the maximal main stress, and the rhomboid diagonal line is the same as the direction of the minimal main stress; 3) forming a central hole in the center of a rhomboid surface according to the arrangement mode of the rhomboid cut blasting hole; and 4) detonating a cutting hole outside and then detonating explosives in an empty hole, thereby achieving the effect of throwing rock mass. The cut blasting design method has the beneficial effects that: the problem that rock mass cut blasting under the high crustal stress condition is difficult is overcome through the design of the cutting hole and the central hole, and the effect of releasing pressure of the deeprock mass can be achieved, so that energy inside some rock mass can be released untimely, and occurrence probability of rock burst can be favorably reduced.

The invention relates to a power battery and a welding method of a sealing nail of the power battery. The welding method of the sealing nail mentioned above is used for welding the sealing nail on a cover plate of the power battery. The welding method of the sealing nail comprises that impurities in a containing groove of the cover plate are cleaned through a first laser, and meanwhile, a first protective gas is blown to the action part of the first laser along a first preset angle between the plane where the first protective gas is located and the plane where the cover plate is located, wherein the focal point of the first laser is located in the containing groove, and the distance from the focal point of the first laser to the bottom of the containing groove is S1; the sealing nail is placed in the containing groove, so that an uneven annular gap exists between the sealing nail and the containing groove; the sealing nail is positioned and fixed in the containing groove in a spot welding mode through a second laser, and meanwhile, a second protective gas is blown to the action part of the second laser; and the sealing nail and the cover plate are welded through the second laser along the annular gap. According to the power battery and the welding method of the sealing nail of the power battery mentioned above, the problem that impurities or explosion points occur when the sealing nail is welded to the cover plate.

The invention discloses a throttle valve. The throttle valve comprises a valve body with a liquid inlet and a liquid outlet, a left end cap and a right end cap are arranged at the two ends of the valve body respectively, the valve body is internally provided with a liquid inlet chamber communicated with the liquid inlet and a liquid outlet chamber communicated with the liquid outlet, and a valve port of a valve seat is of a two-stage step structure; the liquid outlet chamber is internally provided with an internal valve element and an external valve element which are each provided with an inner hole, the two inner holes are formed oppositely to form a middle cavity which is internally provided with a spring, and the two ends of the spring are connected with the internal valve element and the external valve element through spring seats respectively. According to the throttle valve, the valve port of the valve seat is of the two-stage step structure, when liquid pressure is small and cannot overcome an elastic force of the spring, a first-stage throttle orifice is closed, the throttle valve is equivalent to a first-stage throttle valve, when the liquid pressure exceeds the elastic force of the spring, the internal valve element slides in the direction from the inner hole of the external valve element to the external valve element, the first-stage throttle orifice is opened, a second-stage throttle orifice starts to work, and the throttle valve becomes the second throttle valve.

The invention relates to a load reducing type sound barrier unit plate. The load reducing type sound barrier unit plate comprises a unit plate body (2) and lap joint parts (1), wherein the lap joint parts (1) are arranged at the two ends of the unit plate body (2) respectively and used for the mutual lap joint of the upper and lower adjacent load reducing type sound barrier unit plates. Because a gap exists between the upper and lower lap joint load reducing type sound barrier unit plates, and airflow on the road surface can penetrate a sound barrier to enter into the exterior of the road surface and play a role in pressure relieving on the road surface; the load reducing type sound barrier unit plate is provided with sound transmission holes and through holes, a part of sound waves and the airflow which enter into the interior of the unit plate is obstructed, weakened and absorbed by sound absorption lining parts, and the other part of the sound waves and the airflow which enter into the interior of the unit plate penetrates the sound transmission holes and the through holes and are discharged to the other side of the sound barrier. The load reducing type sound barrier unit plate has the advantages of not only effectively reducing noise, but also reducing airflow pressure on the road surface, reducing the pressure difference between the two sides of the sound barrier, effectively reducing the affect of the airflow on vehicles on the road surface, reducing the damage to the sound barrier, and prolonging the service life of the sound barrier.

The invention relates to an oil well mouth blowout preventing device. Two semi-casings are clamped oppositely to be fixed to form a cap-shaped casing. The casing is provided with a top cover integrally molded and a cavity with a lower opening, the lower portion of the casing is provided with a jackscrew hole for a jackscrew to penetrate through, and the jackscrew hole is used for fixing the oil well mouth blowout preventing device on the periphery of a well mouth packing box pressing cover. A gap is formed between the lower portion of a casing inner wall and an outer wall of the well mouth packing box pressing cover. The top cover is provided with a central hole for a polish rod to penetrate through, and the central hole is communicated with a cavity. An annular packing tray is fixedly arranged in the cavity, and an accommodating space for accommodating packing is arranged between the packing tray and the top cover. Therefore, well liquid ejected out during blowout is blocked on an inner wall of the blowout preventing device passively through the cap-shaped structure and flows back to an oil jacket annulus along the inner wall, and large-area environment pollution can not be caused during blowout.

The invention provides an explosion-proof control cabinet, and belongs to the technical field of electrical equipment. The problem that the control cabinet is poor in security is solved. The explosion-proof control cabinet comprises a cabinet body and a guide plate, wherein a rectangular explosion vent is formed in the side wall of the cabinet body, wherein the guide plate is rectangular in shape, the upper edge of the guide plate is hinged to the upper edge of the explosion vent, a gap is formed between each of two side edges and the lower edge of the guide plate and the edge of the explosion vent, and an explosion venting plate is fixedly connected between each of two side edges and the lower edge of the guide plate and the edge of the explosion vent, and a limit stop capable of limiting the maximal outward swinging angle of the guide plate is arranged between the guide plate and the cabinet body. The explosion-proof control cabinet can release pressure when the air pressure in the cabinet body is increased, thus preventing the cabinet body from exploding.

The invention discloses a noise reduction impeller and a range hood applying the same. According to the noise reduction impeller, outer rings and / or inner rings of front-side blades of a middle disk are covered with net covers, the inner flow field of air can be alienated by the covers, and the noise reduction effect can be realized. An air inlet of a fan of the range hood is a back air inlet formed in a volute back side plate, a front ventilating port communicating with an air outlet of the fan is formed in a volute front side plate, the front ventilating port and the back air inlet are separated from each other through the middle disk of the noise reduction impeller, and a noise reduction cavity communicating with the front ventilating port is arranged in front of the fan or in front of and below the fan. The range hood adopts a back side air inlet manner, after the noise reduction cavity is arranged on the front side of the fan, the front ventilating port can be prevented from sucking in oil fume from the lower side of an oil fume collecting cover, flow noise caused by air flow turbulence in front-side space of an outer cover of the fan is eliminated, meanwhile, the way through which noise propagates outwards from the front side of the outer cover of the fan can be blocked, and besides, under the condition of high resistance of a common flue, the noise reduction cavity can also realize the pressure relief effect.

The invention belongs to the technical field of underwater explosion researches and particularly relates to a pressure relief type deepwater environment simulated explosion testing device. The testing device comprises a pressure vessel with a top opening, wherein a pressurizing hole is formed in the side face of the pressure vessel, a pressure relief flange is mounted at the top opening of the pressure vessel, and a static pressure measuring hole, an impact wave pressure measuring hole and a detonation hole are formed in the pressure relief flange; a pressure gage is mounted at the static pressure measuring hole, and sealing flanges are separately mounted at the impact wave pressure measuring hole and the detonation hole; an impact wave pressure measuring device is mounted at the impact wave pressure measuring hole, and a detonating device is mounted at the detonation hole. According to the pressure relief type deepwater environment simulated explosion testing device, the pressure relief flange is arranged at the top of the pressure vessel, the pressure relief flange will be broken away from the pressure vessel after explosion impact pressure reaches a certain value when a deepwater environment simulated explosion test is carried out so as to play a role in relieve pressure, and thus, the bearing capacity of the pressure vessel is not restricted to the volume and wall thickness of the pressure vessel any more, so that the equipment cost and test difficulty are greatly reduced.

The invention relates to an overload connection joint mechanism which comprises a sealing connection part and a filtering pressure relief part. One end of the sealing connection part communicates withan oil cylinder in a sealing way; the other end of the sealing connection part is connected with the filtering pressure relief part in a sealing way; the sealing connection part comprises an elasticsealing piece, a pressing connection piece and a connecting oil pipe; and the filtering pressure relief part comprises an oil tank, a filter box and a buffer air bag. The overload connection joint mechanism has the advantages of reliability in sealing, convenience in installing, low technical requirement on installation, and stable performance.

The embodiment of the invention relates to the technical field of display screen manufacturing, and discloses an evaporation crucible. The evaporation crucible comprises a crucible body and a filtering device; the crucible body is used for accommodating an evaporation material; the filtering device is arranged in the crucible body, and comprises a central part and a peripheral part surrounding thecentral part; the crucible body comprises a bottom wall used for bearing the evaporation material, and the peripheral part is obliquely arranged in the direction away from the bottom wall; and the central part is used for blocking solid impurities in the evaporation material, a plurality of first through holes are formed in the peripheral part in a penetrating mode, so that the evaporation material passes through the filtering device after being vaporized. According to the evaporation crucible, the impurities in the evaporation material can be filtered, and the evaporation material can be smoothly sprayed out of the evaporation crucible after being vaporized.

The invention discloses a double-layer double-safety autoclave with discharge pipe orifices, which comprises an autoclave body and an autoclave cover, wherein the autoclave body and the autoclave cover are both formed by integrally explosively welding double-layer steel plates; the autoclave cover is provided with an explosion-proof valve; a pressure relieving pipe orifice is reserved on the lateral part of the autoclave body; an air inlet of a pressure relieving storage tank is communicated with the pressure relieving pipe orifice by a valve; and a straight discharge pipe orifice and inclined discharge pipe orifices are reserved at the bottom of the autoclave body, and are provided with the valve respectively.

The invention discloses a machining process of a foaming cover of a foam maker, and belongs to food making tools. Due to a large number of air holes existing in a blank produced through a traditionalcasting process of an existing foam maker foaming cover and conveying casting defects, the defect that the mechanical performance of various aspects is greatly reduced is caused. The machining processspecifically comprises the following steps of a, discharging, b, forging and pressing, c, turning, d, drilling, e, milling, f, threading and g, surface treatment. After a rod is heated, forged and pressed to form the approximate appearance of the foaming cover, machining of other portions and the inner structure is carried out, the situation that in the traditional foaming cover, a manufacturer adopts aluminum casting forming, and consequently a large number of air holes exist in a material of the foaming cover is avoided, and the mechanical performance of the foaming cover is improved.

The invention discloses a pressure relief protection mechanism and a switch cabinet. The pressure relief protection mechanism comprises a group of first pressure relief protection devices and two groups of second pressure relief protection devices which are arranged on a top plate of a switch cabinet. According to the invention, when the pressure in the switch cabinet is not very high, only the first pressure relief protection device plays a role in pressure relief, the movable plate is pushed outwards by internal high air pressure, and gas is released from the first pressure relief opening; when the position detection device detects that the movable plate is pushed to the middle position or the outer end of the first pressure relief opening, the locking plate of the locking mechanism rotates, the pressure relief plate can be jacked open at any time, and the first pressure relief protection device and the second pressure relief protection device play a role in pressure relief protection at the same time; and when the position detection device detects that the movable plate returns to the inner half side of the first pressure relief opening, the locking plate of the locking mechanism rotates, and the pressure relief plate is locked.

The invention discloses an offset type pressure relief device of a membrane pump. The offset type pressure relief device is arranged on a pump cover body and comprises a chamber, a high-pressure hole, a low-pressure hole, a piston, a spring and a sealing cover, wherein the chamber is formed in the pump cover body and is inwards concave; the high-pressure hole and the low-pressure hole which are respectively communicated with a high-pressure cavity and a low-pressure cavity of the membrane pump are formed in the chamber; the piston, the spring and the sealing cover are sequentially arranged in the chamber; the chamber is arranged at one side which is inclined to the pump cover body, the high-pressure hole and the low-pressure hole are both formed in the bottom part of the chamber, and the high-pressure hole and the low-pressure hole are blocked by the end parts of the piston. Since the offset type pressure relief device disclosed by the invention is adopted, the fluid flowing resistance is reduced, the efficiency of the membrane pump is increased, the noise of the membrane pump is reduced, and fluid cannot flow into the pressure relief chamber to soak the spring; since the offset type pressure relief device is simple in structure, a die is simplified, the cost of the die is reduced, and the cost of an injection molding material is reduced.

The invention discloses a cover structure of an electric pressure cooker, which comprises a surface cover and an inner cover below the surface cover; the inner cover is provided with fastening teeth which are mutually rotationally matched with an outer cooker body of the electric pressure cooker; and the surface cover and a cooker body are connected in an overturning way by a hinge. The cover structure is characterized in that: the central position of the surface cover is provided with a central hole of the surface cover and a rotating central shaft; the rotating central shaft is axially positioned and can be radially rotationally arranged in the central hole of the surface cover; and the inner cover is fixedly connected with the rotating central shaft. In the cover structure, the rotating central shaft is rotated to drive the inner cover fixedly connected with the rotating central shaft to rotate, so that the aim of opening or fastening a cover is achieved, and the cover structure is simpler and has lower cost. The technical proposal can be suitable for cover structures of various pressure cookers.

The invention discloses a mechanical pneumatic pressure alarm device. The mechanical pneumatic pressure alarm device is connected with and communicates with an air source outlet, and comprises a shellbody, a buzzer assembly, a sealing seat and a valve core; a gas chamber is arranged in the shell body, the upper end of the gas chamber is an open end, the bottom end of the gas chamber is an air inlet end, and the air inlet end is connected with and communicates with the air source outlet; the buzzer assembly is detachably connected with the open end, and is internally provided with a resonancechamber, and the resonance chamber communicates with the gas chamber; the sealing seat is arranged at the bottom of the gas chamber, the outer wall of the sealing seat is connected with the inner wallof the gas chamber in sealed and contact modes, the sealing seat is provided with an air inlet passage penetrating through the upper and lower ends of the sealing seat, and the air inlet passage communicates with the gas chamber; and the valve core are arranged in the air inlet passage and is used for closing and opening the air inlet passage. The device makes use of resonance of gas and the resonance chamber to produce a whistle like alarm sound, thus the size of an alarm structure is greatly reduced, external power supply is not needed, and the device is convenient to integrate into a pneumatic component.

The invention relates to the technical field of industrial internet, in particular to an industrial internet big data center host which comprises a stainless steel protective shell and a host body, the host body is movably installed in the stainless steel protective shell, a water storage cavity is formed in the inner wall of the stainless steel protective shell, and a stainless steel pipe is arranged between the host body and the stainless steel protective shell. A pair of connecting pipes is fixedly embedded into the left portion of the rear end of the inner wall of the stainless steel protective shell, and rubber sheets are fixed to the inner walls of front end pipe openings of the connecting pipes. The main machine body is arranged in the stainless steel protective shell, water cooling heat dissipation can be achieved through the stainless steel pipe, drinkable water is directly contained in the water storage cavity of the stainless steel protective shell, the dual water cooling heat dissipation effect can be achieved, the heat dissipation performance of the main machine body is improved in cooperation with the draught fan, the problem that the heat dissipation effect is poor due to the fact that heat dissipation is generally conducted on an existing industrial internet big data center host through a heat dissipation fan is solved.

The invention relates to the technical field of hot runners, in particular to a large hot runner system without interfering system operation after glue leakage. The large hot runner system structurally comprises a transition template arranged between a first spreader plate and a second spreader plate; the transition template is provided with a through hole; a transition hot sprue is arranged in the through hole; an inlet end face of the transition hot sprue pushes against the first spreader plate; an outlet end face of the transition hot sprue pushes against the second spreader plate; and a gap between the outer wall of the transition hot sprue and the inner wall of the through hole is bigger than a gap between the periphery part of an opening of the through hole of the transition template and the first spreader plate, and a gap between the periphery part of the opening of the through hole of the transition template and the second spreader plate. In this way, molten glue leaking from the transition hot sprue shall flow into and is collected in the gap between the outer wall of the transition hot sprue and the inner wall of the through hole, and can not leak outwards continuously to flow onto the first spreader plate or the second spreader plate. Therefore, even if the large hot runner system has the glue leakage, normal operation of the overall large hot runner system can be guaranteed, and die wear arising from the glue leakage can be eliminated.

The invention discloses a noise reducing impeller and a range hood applying the impeller. The noise reducing impeller is provided with a noise reducing hole in a front side blade of a middle disc; a fan intake port of the range hood is a back intake port formed in a volute back side plate; a volute front side plate is provided with a front ventilation port communicated with a fan exhaust port; the front ventilation port and the back intake port are separated through the middle disc of the noise reducing impeller; and a noise reducing cavity communicated with the front ventilation port is formed in front of the fan or in front of and below the fan. The noise reducing impeller is provided with the noise reducing hole in the front side blade of the middle disc for reducing the operation noise; in addition, the range hood adopts a back side intake mode, and the noise reducing cavity is formed in the front side of the fan, so that lampblack can be prevented from sucking by the front ventilation port from the lower side of a hood, the disordered flowing noise of air currents in the front side space of a fan cover is eliminated, and meanwhile, the path of outwards propagating the noise through the front side of the fan cover can be stopped; and under the condition of high resistance of a public flue, the noise reducing cavity also can achieve a pressure relief effect.

This invention discloses one air compressor compensated start device, which is set into air compressor discharge chamber and is composed of valve board and valve slices, wherein, the valve board is opened with discharge hole or tank; it is characterized by that the valve slice is of bent shape on valve board; the valve board discharge hole or tank is set down valve slice; the said slice one end is fixed on valve board through screw nail and other end bend up for larger than 25 degrees.

The invention discloses a postoperative rehabilitation nursing training device for the department of cardiology. The postoperative rehabilitation nursing training device for the department of cardiology comprises a sleeve gasket, the sleeve gasket is made of hard rubber and cannot generate too much deformation under pressure, a cavity channel is formed in the sleeve gasket and is annular, a grooveis formed in the right side of the inner bottom of the outer annular wall of the cavity channel, rotating grooves are formed in the left side and the right side of the outer annular wall of the cavity channel, and rotating wheels are movably connected into the rotating grooves. According to the postoperative rehabilitation nursing training device for the department of cardiology, the annular cavity channel is formed in the sleeve gasket; when the device is used, a patient lies on a bed, the sleeve gasket wraps the outer side of the arm of the patient, a finger ring of the pull rope annularlysleeves the five fingers of the patient, the patient starts to open and close the five fingers after all preparatory work is completed, the piston rod is continuously pulled and controlled to compressand push the reset spring, the fingers of the patient are exercised, and blood circulation is promoted to a certain extent.

The invention belongs to the technical field of water chilling machines, and particularly relates to an industrial water chilling unit which comprises a purification device, a water inlet, a water outlet and a gas-liquid separator, the water inlet is located in the lower left end of the purification device, the water outlet is located in the center of the top of the purification device, and the purification device comprises a shell, a filter element device and a top column; the baffle ring is located on the lower half portion of the shell, the filter element device is installed above the baffle ring and comprises an upper cover plate, a lower cover plate and a filter screen, the upper cover plate is fixedly connected with the filter screen, the filter screen is fixedly connected with the lower cover plate, the top column is vertically installed in the filter screen and comprises a top plate and a top rod, and the top plate is in sliding connection with the inner side of the filter screen. According to the invention, the air pump is directly used as a power source, the structure is relatively simple, the cost of later maintenance is reduced, secondary filtration is realized through the design of the top column, and the filtration effect is improved.

The invention discloses a buffer system for draining local burst gushing water of a tunnel. Accumulated water in the tunnel is drained to the outside of the tunnel through a central ditch, a burst water gushing area on the outer side of the tunnel is provided with a water collecting tank, a buffer tank is arranged on the outer side of the water collecting tank, the water collecting tank is connected with the buffer tank through a drainage channel, the buffer tank is connected with the central ditch through a drainage pipe, a valve is mounted on the drainage pipe, a drainage pump is arranged in the buffer tank, and a water outlet of the drainage pump is connected with a water inlet of the drainage pipe. The invention further discloses a control method of the buffer system for draining local burst gushing water of the tunnel. The drainage pump and the valve on the drainage pipe are opened or closed according to the water height of a position, corresponding to the buffer tank, in the central ditch, so that water in the buffer tank is cleared as far as possible, and the quantity of water in the central ditch is kept in the maximum flow value of the central ditch. Local burst gushing water of the tunnel is timely collected and drained by the aid of the temporary water storage function of the buffer tank, pressure is safely relieved, and safety of the tunnel is facilitated.

The invention relates to a load reducing type sound barrier unit plate. The load reducing type sound barrier unit plate comprises a unit plate body (2) and lap joint parts (1), wherein the lap joint parts (1) are arranged at the two ends of the unit plate body (2) respectively and used for the mutual lap joint of the upper and lower adjacent load reducing type sound barrier unit plates. Because a gap exists between the upper and lower lap joint load reducing type sound barrier unit plates, and airflow on the road surface can penetrate a sound barrier to enter into the exterior of the road surface and play a role in pressure relieving on the road surface; the load reducing type sound barrier unit plate is provided with sound transmission holes and through holes, a part of sound waves and the airflow which enter into the interior of the unit plate is obstructed, weakened and absorbed by sound absorption lining parts, and the other part of the sound waves and the airflow which enter into the interior of the unit plate penetrates the sound transmission holes and the through holes and are discharged to the other side of the sound barrier. The load reducing type sound barrier unit plate has the advantages of not only effectively reducing noise, but also reducing airflow pressure on the road surface, reducing the pressure difference between the two sides of the sound barrier, effectively reducing the affect of the airflow on vehicles on the road surface, reducing the damage to the sound barrier, and prolonging the service life of the sound barrier.

The invention relates to a power battery and a welding method of a sealing nail of the power battery. The welding method of the sealing nail mentioned above is used for welding the sealing nail on a cover plate of the power battery. The welding method of the sealing nail comprises that impurities in a containing groove of the cover plate are cleaned through a first laser, and meanwhile, a first protective gas is blown to the action part of the first laser along a first preset angle between the plane where the first protective gas is located and the plane where the cover plate is located, wherein the focal point of the first laser is located in the containing groove, and the distance from the focal point of the first laser to the bottom of the containing groove is S1; the sealing nail is placed in the containing groove, so that an uneven annular gap exists between the sealing nail and the containing groove; the sealing nail is positioned and fixed in the containing groove in a spot welding mode through a second laser, and meanwhile, a second protective gas is blown to the action part of the second laser; and the sealing nail and the cover plate are welded through the second laser along the annular gap. According to the power battery and the welding method of the sealing nail of the power battery mentioned above, the problem that impurities or explosion points occur when the sealing nail is welded to the cover plate.