64results about How to "Avoid plastic deformation" patented technology

The utility model relates to the technical field of elevator derricks, in particular to an inward bending steel structure derrick for installing an elevator, which comprises a base, a derrick I and a plurality of derricks II, the derrick I is fixedly arranged at the top of the base, and the plurality of derricks II are fixedly arranged at the top of the derrick I in sequence. A plurality of stand columns and cross beams are arranged in the base, the first derrick and the second derrick, four stand columns distributed in a rectangular shape are arranged in the base, the first derrick and the second derrick, and the cross beams are connected between every two adjacent stand columns through bolts. The stand column is formed by inwards folding a steel plate to form a first bending piece and a second bending piece, the end, away from the second bending piece, of the first bending piece is inwards folded to form a third bending piece, and the end, away from the first bending piece, of the third bending piece is inwards folded to form a first bending connecting piece. According to the utility model, the problems of single structure, insufficient performance and stress concentration of connecting nodes of an elevator derrick upright post additionally arranged in an old community are solved, and the overall strength, stability and safety of the derrick are improved.

Cleaning brushes (100, 200), a smart cleaning device, and a method for manufacturing the cleaning brushes (100, 200). The cleaning brushes (100, 200) each comprise a mounting shaft (110), an elastic support member (120), and a tubular member (130); the elastic support member (120) has a through hole extending in the axial direction, and the elastic support member (120) is sleeved on the mounting shaft (110) by means of the through hole; the tubular member (130) is sleeved on the elastic support member (120) and provided with blades (131, 231) integrally formed together with the tubular member (130); an adhesive layer is provided both between the mounting shaft (110) and the elastic support member (120) and between the elastic support member (120) and the tubular member (130), such that the mounting shaft (110), the elastic support member (120), and the tubular member (130) are bonded together.

The invention relates to a welding strip obtaining method and a welding method of a solar cell piece. The welding strip obtaining method comprises the following steps that effective welding parameters of a welding device are obtained; obtaining effective geometric parameters of the solder strip; based on the effective welding parameters and the effective geometric parameters, the yield strength range matched with the welding strip is obtained; and based on the yield strength range, a welding strip matched with the welding device is selected. According to the solder strip obtaining method and the welding method of the solar cell, the pseudo soldering rate of the solder strip is remarkably reduced, the solder strip is prevented from plastic deformation, cross section area reduction or snap due to overlarge wire winding tension, and the resistance of the solder strip is prevented from being increased, so that the welding quality and the electrical performance are improved.

This application relates to the field of air purifiers and discloses a side cover assembly and an air purifier. The side cover assembly includes a side cover and a first reinforcing plate. A receiving groove is formed at the edge of the side cover, and a slot is also provided on the side cover. The slot is located at the end of the receiving groove and communicates with the receiving groove. The first reinforcing plate is disposed in the receiving groove, and the end of the first reinforcing plate is located in the slot. The end of the first reinforcing plate away from the receiving groove is used to fix it to the bottom cover of the air purifier. By setting a receiving groove and a slot at the edge of the side cover, and installing the first reinforcing plate in the receiving groove with its end inserted into the slot and fixed to the bottom cover, this application avoids plastic deformation of the side cover caused by mechanical stress concentration, eliminates the need to increase the wall thickness of the side cover or change the arrangement of the grille ribs, and reduces material costs and molding process complexity.

The invention relates to the technical field of packers, in particular to an anti-falling packer for oil production engineering, which comprises a packer, a rubber sleeve is fixedly connected to the middle position of the packer, a plugging and limiting mechanism capable of providing protection for the rubber sleeve is arranged on the packer, and the plugging and limiting mechanism comprises a plurality of sliding chutes, a guide groove and a limiting seat. Sliding grooves are formed in the top end and the bottom end of the limiting seat, movable plates are slidably connected to the interiors of the sliding grooves, symmetrically-arranged guide strips are fixedly connected to the movable plates, first supports are fixedly connected to the positions, in the sliding grooves, of the movable plates, linkage blocks are rotatably connected to the first supports, and two symmetrically-arranged supports are fixedly connected to the top end and the bottom end of the limiting seat; the packer has the beneficial effects that excessive radial expansion of the rubber sleeve can be limited, plastic deformation or tearing of the rubber sleeve due to high pressure is prevented, meanwhile, pressure borne by the rubber sleeve is evenly dispersed, the overall structural stability is improved, and the sealing reliability and the structural stability of the packer are further improved.

The utility model discloses a suspension floor board with a reinforcing column, which comprises a floor board main body, the center of the floor board main body is fixedly connected with a central column, a plurality of groups of support plates are distributed on the circumference of the outer wall of the central column, and two ends of each second insertion rod are in contact with the outer walls of two adjacent groups of first insertion rods. Under the dynamic impact effect, the elastic reset force of the spring enables the fixing rod to press the first inserting rod and the second inserting rod all the time, micro elastic deformation of the floor body is allowed, and the problems that due to stress concentration in traditional rigid connection, rib plate intersection joints crack, and the root of a center column is fractured are effectively solved; a cross nested structure formed by the reinforcing plates and the supporting plates can evenly disperse loads to the center column and the floor body, and the impact resistance of the suspension floor under the high-frequency dynamic loads is improved.

The utility model discloses a kind of high-purity membrane box absolute pressure vacuum switches, it is related to high-purity technical field, including lower connector, the middle part of lower connector is provided with vertical through-hole, vertical through-hole is fixed with flow guide pipe inside, the upper end of flow guide pipe is fixed with membrane box assembly, the inner chamber of flow guide pipe and membrane box assembly is communicated, the upper end of lower connector is threadedly connected with upper connector, the upper end of lower connector inside is threadedly connected with switch fixing sleeve, the surface of switch fixing sleeve is threadedly connected with limiting nut, the lower end in switch fixing sleeve inside is fixed with microswitch by switch fixed pin, the upper end of microswitch and membrane box assembly is inlaid, the upper end of upper connector is fixed with serial port connector by two hexagonal fixed screws, can accurately monitor tiny absolute pressure change, and can avoid damage under instantaneous overvoltage or impact condition.

The application relates to the technical field of temperature-sensitive control, in particular to an automatic reset type temperature-sensitive control device, which comprises a device main body, rotating boxes are fixedly connected to the two sides of the device main body, an alternating heat conduction mechanism is arranged in the rotating boxes, the alternating heat conduction mechanism comprises heat insulation plates which are slidingly connected in the rotating boxes, left plates and right plates are fixedly connected to the two sides of the heat insulation plates, left heat conduction fins are slidingly connected to the end portions of the left plates, when the electrical equipment is damaged to cause abnormal temperature rise, the bimetallic strip is bent greatly when sensing the continuous high temperature, at the moment, the pressure rod drives the bimetallic strip to move downwards and is separated from the right heat conduction fin, the continuous transmission of the heat source to the bimetallic strip is cut off, plastic deformation of the bimetallic strip beyond the elastic bending limit is avoided, the bimetallic strip can be normally reset when the temperature falls back, and the long-term use performance of the bimetallic strip is ensured.

This utility model belongs to the field of automotive parts and provides a convenient toggle switch mounting structure and automobile for assembling a toggle switch onto a mounting frame. The mounting frame is provided with a positioning block and a transmission rod. The side wall of the positioning block forms a limiting part, which restricts the movement of the toggle switch relative to the mounting frame. The transmission rod is connected to the air conditioning button within the mounting frame. Compared with the prior art, the advantages of this utility model are that the guide slope cooperates with the limiting part on the mounting frame to achieve automatic guidance and positioning of the toggle switch during installation; the end of the guide block on the toggle switch directly abuts against the transmission rod, accurately transmitting the user's operating force to the air conditioning button; at the same time, symmetrical reinforcing ribs are provided on the guide block, significantly enhancing the structural strength of the guide block, effectively preventing plastic deformation caused by long-term pressing or external force, avoiding problems of broken contact or poor contact between the guide block and the transmission rod, and ensuring stable transmission of control signals.

The utility model provides a kind of flat tube automatic sliding device and radiator assembly machine, the flat tube automatic sliding device includes device support;Heat pipe conveying mechanism, for conveying heat pipe;Guiding connecting seat, fixed on the device support, and with heat pipe conveying mechanism butt joint to form first guide channel, the first guide channel end is equipped with channel outlet;Flat tube trend adjusting mechanism, including stop block, the third cylinder of driving the stop block and connecting seat, the connecting seat forms vertical third guide channel and with the channel outlet butt joint;Lifting support device, including lifting module, second cylinder and second support frame.The utility model realizes the flexible steering of heat pipe by arc first guide channel arc setting, eliminates hard collision;Lifting support device before heat pipe enters vertical channel, initiative extension second support frame whole process support bottom, reduce deformation rate;By automatic shunt surplus material, it is convenient to take out redundant pipe body.

The utility model relates to the technical field of batteries, in particular to a battery box body, a battery and an electric device. The battery box body comprises a lower box body and a plurality of connecting pieces, the plurality of connecting pieces are arranged on the peripheral side of the lower box body at intervals, the connecting pieces are arranged on the lower box body in a penetrating manner, are in threaded connection with the bracket through first fastening pieces, and are made of steel materials. By arranging the connecting piece made of the steel material, the torque transmission efficiency can be remarkably improved, torque attenuation is avoided, plastic deformation and thread abrasion of the lower box body at the bolt fastening position are reduced, and the service life is prolonged; the structure is simple, and the production cost is reduced; disassembly, assembly and maintenance are convenient, and the maintenance cost is reduced. According to the battery, by applying the battery box body, plastic deformation and thread abrasion of the lower box body at the bolt fastening position can be avoided, the service life of the battery is prolonged, and the maintenance and production cost is reduced. By applying the battery, the service life of the power utilization device is ensured, and the maintenance and production cost is reduced.

The utility model discloses a kind of cooling tower multilayer sealing water leakage prevention water-collecting basin, belong to cooling tower technical field, including the water-collecting basin bottom surface formed by the bottom plate splicing combination of multiple;The four edges of each bottom plate are bent downward to form flange;Adjacent bottom plate is fixed by bolt on flange and is connected each other;The flange of the side of bottom plate is provided with the strip-shaped recess formed by recessing inward, and the flange of the opposite side is provided with the convex strip of Z-shaped bending and protruding outward;Adjacent bottom plate is spliced by recess and protrusion cooperation. The utility model discloses the butt joint edge of cooling tower water-collecting basin is designed as Z-shaped multilayer bending structure, to form multiple sealing barrier by multilayer adhesion, and reduce the amount of bolt, to significantly improve the water leakage prevention performance under the premise of not increasing material, reduce manufacturing cost and simplify production process.

This invention relates to the field of positioning technology for thin-walled workpieces, and discloses a positioning device for preventing offset of thin-walled workpieces based on CNC machine tools. It aims to solve the technical problems of easy deformation during positioning of thin-walled workpieces and poor adaptability of traditional clamping blocks. The device includes a CNC machine tool body, a rotating chuck, an adjustment drive assembly, a push rod assembly, and a tensioning positioning assembly. A frustum-shaped push block converts rotational motion into linear motion via a screw and nut mechanism. This, in conjunction with a limiting assembly, drives the push rod assembly to synchronously and uniformly extend and retract radially, causing a spring steel sheet with a pre-positioned section to achieve curvature self-adaptation. The pre-positioned section is a sliding compensation arc surface section, adapting to thin-walled pipes of different diameters while maintaining surface contact. The device has two sets of staggered tensioning positioning rings, forming a full-circumferential, gapless support for the inner wall of the pipe. This device avoids stress concentration problems caused by line contact, effectively preventing deformation of thin-walled pipes, balancing positioning firmness and deformation prevention requirements, and significantly improving the processing qualification rate and production efficiency of thin-walled pipes.

The utility model relates to the field of protection and transportation packaging, concretely relates to a light high sealing property storage and transportation box, the storage and transportation box includes lower box and the cooperation of upper box, the lower box includes first metal framework, first metal framework sets up inside first buffer layer, the outer surface of first buffer layer is provided with first skin, the upper box includes second metal framework, second metal framework sets up inside second buffer layer, the outer surface of second buffer layer is provided with second skin, the utility model discloses storage and transportation box adopts the structure of pre -buried metal framework in buffer layer, makes the strength of storage and transportation box to promote the light weight characteristic of while, alleviates the transportation difficulty of storage and transportation box, metal framework guarantees that the storage and transportation box satisfies the strength under complex mechanical environment and various working conditions, and buffer layer is light in weight and can significantly improve the impact resistance of storage and transportation box in the process of movement, and skin guarantees that the storage and transportation box can withstand the test of marine environment and other high salt high humidity bad natural environment.

The utility model discloses a reinforcement cage structure for pouring a bottom platform of a wind power tower, and belongs to the technical field of pouring structures of wind power towers. The cage comprises an annular outer cage frame, three groups of parallel transverse cage frames and five groups of longitudinal cage frames, the three groups of parallel transverse cage frames are arranged from front to back, and the five groups of longitudinal cage frames are distributed from right to left. The first longitudinal cage frame crosses the first and second transverse cage frames, and the middle part is crossed with the third transverse cage frame; the second longitudinal cage frame vertically penetrates through the three groups of transverse cage frames; the third longitudinal cage frame is connected with the second and third transverse cage frames; the fourth longitudinal cage frame and the fifth longitudinal cage frame extend from the outer cage frame and penetrate through the second transverse cage frame to the third transverse cage frame. And an additionally arranged fourth transverse cage frame is connected with the outer cage frame and penetrates through the first longitudinal cage frame to the second longitudinal cage frame. The first transverse cage frame is provided with two transverse lifting lugs, and the second transverse cage frame is provided with a longitudinal lifting lug at the intersection point of the second longitudinal cage frame and the fifth longitudinal cage frame; the utility model effectively solves the problem that the construction period is influenced because the reinforcement cage is easy to deform and needs to be repaired subsequently when the pre-buried reinforcement cage structure is transferred by using a crane at present.

This invention relates to the field of compressor technology, specifically to a multi-stage cycle energy-saving BOG compressor unit, comprising a valve, which includes a valve seat, a lift limit plate, a valve plate, a spring assembly, and a sealing gasket. The valve seat has a first gas passage. The valve plate is located between the lift limit plate and the valve seat, with its side facing the valve seat serving as a sealing surface. The valve plate also has a second gas passage. The spring assembly, located between the lift limit plate and the valve plate, drives the valve plate to move closer to the valve seat. The sealing gasket is located on the sealing surface, is annular, and corresponds vertically to the first gas passage. The sealing gasket has an arc-shaped cross-section along its radial direction, forming an arc-shaped guiding surface. When the valve plate moves away from the valve seat, the arc-shaped guiding surface guides gas from the first gas passage into the second gas passage, reducing the impact of gas on the valve plate's sealing surface and extending the valve's service life.

This utility model relates to the technical field of oblique insertion automatic sheet expansion machine, and in particular to a mold and pressing mechanism for small-pitch products in an oblique insertion automatic sheet expansion machine. The mold and pressing mechanism for small-pitch products in an oblique insertion automatic sheet expansion machine includes a mold assembly and a pressing mechanism. The mold assembly includes a mounting base plate and several sheet-shaped molds arranged side-by-side, with equal spacing between adjacent molds. Each sheet-shaped mold has an inserting tooth portion and a connecting portion. The inserting tooth portion consists of multiple parallel-arranged first inserts, and the connecting portion is a top notch cavity. The pressing mechanism includes a cantilever, a cylinder, and a pressure plate assembly. Below the pressure plate assembly is a mold reinforcing plate corresponding to the sheet-shaped molds. Its second inserts engage with the inserting tooth portion, and the snap teeth engage with the notch cavity. This structure effectively enhances mold rigidity through dual positioning, preventing deformation during small-pitch production, while also facilitating rapid mold changeover, making it suitable for precision expansion processing of small-pitch products.

This invention discloses a pulsed current-assisted strip stamping forming device, relating to the field of composite metal strip processing technology, to solve the problem of how to prepare reliably bonded composite strips under small deformation conditions. The pulsed current-assisted strip stamping forming device includes: a bearing device with a bearing surface, a first electrode disposed on the bearing surface, and at least two metal strips to be bonded stacked on the first electrode. A moving device is disposed on the bearing surface, and a pulsed current-assisted stamping device is disposed on the moving device, positioned above the first electrode. The moving device is used to move the pulsed current-assisted stamping device to or away from the metal strips, and a pulse power supply is electrically connected to the pulsed current-assisted stamping device and the first electrode. This invention achieves the preparation of reliably bonded composite strips under small deformation conditions by simultaneously applying pulsed current and stamping force to the area of ​​contact by the pulsed current-assisted stamping device.

The utility model provides a kind of equipment for releasing internal stress of aluminium plate, it is related to aluminium plate processing technical field, including equipment main body, fixedly arranged on support surface;Transmission device, the bottom inside equipment main body is arranged, for transmission aluminium plate;Press release device, fixedly arranged in the top inside equipment main body, for the press release internal stress to aluminium plate on transmission device;Two heating devices, install at the top and bottom inside press release device, by setting two heating devices located at the top and bottom of press release device, utilize fan to drive the external air current filtered by filter screen to enter device shell, after being heated by heating pipe, blow to the top and bottom of aluminium plate, realize the even heating of the upper surface and the whole of aluminium plate, effectively solve the problem of uneven temperature distribution and inconsistent internal stress release caused by one-sided or local heating in prior art.

The invention relates to the technical field of temperature-sensitive control, in particular to an automatic reset type temperature-sensitive control device which comprises an equipment body, a bimetallic strip is installed in the equipment body, alternating boxes are fixedly connected to the two sides of the equipment body, and alternating heat conduction mechanisms are arranged in the alternating boxes. The alternating heat conduction mechanism comprises a heat insulation plate slidably connected to the interior of the alternating box, the two sides of the heat insulation plate are fixedly connected with a left plate and a right plate correspondingly, and the end of the left plate is slidably connected with a left heat conduction piece. When the bimetallic strip is greatly bent after sensing continuous high temperature, the pressing rod can drive the bimetallic strip to move downwards and be separated from the right heat conducting strip, continuous transmission of a heat source to the bimetallic strip is cut off, the bimetallic strip is prevented from exceeding the elastic bending limit and generating plastic deformation, it is ensured that the bimetallic strip can be normally reset when the temperature falls back, and the long-term use performance of the bimetallic strip is guaranteed.

This invention belongs to the field of aquatic aeration technology, and specifically relates to an aeration and stirring device, comprising: a shell, a first aeration pipe, a stirring assembly, and a deceleration assembly; the first aeration pipe, the stirring assembly, and the deceleration assembly are disposed inside the shell, with the first aeration pipe located at the bottom of the shell, aerating the material inside the shell; the stirring assembly agitates the bubbles released by the first aeration pipe; the rotation of the stirring assembly drives the first aeration pipe to rotate; and the deceleration assembly makes the rotation speed of the stirring assembly greater than that of the first aeration pipe. By rotating the first aeration pipe, materials at greater depths can be fully aerated, while the rotation of the stirring assembly ensures that materials at less depths are fully aerated, resulting in uniform aeration of materials at different depths and improving aeration efficiency; the deceleration assembly makes the rotation speed of the first aeration pipe less than that of the stirring assembly, which facilitates the stirring assembly to fully agitate the bubbles released by the first aeration pipe into materials at less depths, improving oxygen utilization and increasing aeration efficiency.

The invention discloses an active reset locking strip for preventing a driving screw from being stuck, and belongs to the technical field of electronic equipment locking. The locking strip comprises a bottom plate, a sliding block assembly and a three-section type driving screw. The driving screw is provided with a front-end polished rod section, a middle-section threaded rod and a rear-section threaded rod, and the rear-section threaded rod is sequentially provided with a check ring, a check ring nut, a spring washer, a flat washer and a driving nut. When unscrewed to the limit position, the boss of the retainer ring abuts against the front sliding block, and the rear section idles to avoid dislocation and deformation of the retainer ring. The sliding block assembly is in interference fit with a pin through an inclined kidney-shaped groove, and countersunk head screw holes are formed in the front face of the bottom plate to facilitate installation. The driving screw can be effectively prevented from being stuck, and vibration resistance and reliability are improved.

This utility model belongs to the technical field of starter motor sealing components, specifically relating to an embedded structure for a starter motor sealing stationary ring assembly. It includes a graphite ring and a metal ring, with the metal ring disposed on the outer circumferential surface and one axial end side of the graphite ring. A wave spring is disposed on the metal ring, and a limiting tongue is disposed on the wave spring, with the limiting tongue evenly distributed along the circumferential direction of the wave spring. An annular groove is provided on the inner circumferential surface of the graphite ring, and a sealing ring is disposed within the annular groove. This embedded structure, by placing the metal ring only on the outer circumferential surface of the graphite ring and on the side facing the wave spring, allows the graphite ring to achieve a 30%–50% axial thickening and an 80%–100% radial thickening within a space of only 10mm in axial length. This significantly improves the structural strength of the graphite ring and avoids the radial thin-wall phenomenon caused by the metal ring encircling three sides in existing structures, thereby reducing the risk of the graphite ring cracking due to stress concentration during high-speed rotation of the starter motor.

This utility model discloses an electronic fastener with conductive function. The conductive fastener consists of a screw, a plug, and a handle. A limiting plate is provided between the screw and the plug, and the limiting plate is integrally formed with the plug and the screw. A slot is provided in the middle of the handle, and the plug is inserted into the slot. A groove is provided on the upper side of the handle, and a threaded hole is provided at the upper end of the plug. The fixing bolt is rotatably installed in the threaded hole. The handle of this utility model is used to increase the uniformity of the screw tip, facilitate the installation and fixing of the screw, and at the same time, it can protect the upper part of the screw through the handle.

The utility model relates to the technical field of joint connection discloses a kind of upper joint of connecting mechanism, including first joint body, first joint body includes pressure bottom plate, transition sleeve and two wing plates, two wing plates are symmetrically arranged in pressure bottom plate both sides, wing plate includes rectangular part and trapezoidal part, rectangular part is connected with pressure bottom plate, rounding treatment is carried out between rectangular part and pressure bottom plate, and the rounding radius of rectangular part and the inner wall of pressure bottom plate is greater than the rounding radius of rectangular part and pressure bottom plate outer wall, transition sleeve is arranged in the middle of one end of pressure bottom plate away from wing plate, wing plate, pressure bottom plate and transition sleeve outer wall are symmetrically provided with reinforcing rib;By setting wing plate and pressure bottom plate form stable bearing frame of U, and cooperate with the middle support structure of transition sleeve, the lift, thrust, lateral force and torsional load generated by flight body can be simultaneously and efficiently transferred, to avoid single direction stress concentration.

The application provides a MEMS capacitive pressure sensor and a preparation and use method thereof, and relates to the technical field of sensors.The structure of the MEMS capacitive pressure sensor provided by the application mainly comprises a force-sensitive nanofilm, a temperature-sensitive nanofilm, a substrate and a base plate, the substrate and the base plate are separated into two independent sealed cavities, and the surface of the base plate opposite to the force-sensitive nanofilm is etched with a ladder-shaped structure.The application optimizes the capacitive-pressure response characteristics (when the external pressure acts, the force-sensitive nanofilm is deformed, and the linear coupling is generated by the change of the effective overlapping area and the interval between the force-sensitive nanofilm and the ladder-shaped structure), and combines with the in-situ temperature compensation of graphene, so that the MEMS capacitive pressure sensor provided by the application can realize high linearity of pressure measurement in a wide temperature range, and the technical problems of traditional devices, such as serious temperature crosstalk and narrow linear interval, are solved, thereby providing a new solution for high-precision and high-reliability pressure measurement.

The present invention realizes a configuration capable of improving the strength of a pair of support plate portions. The upper end edges of a pair of support plate portions (22a) are fixed to the lower surface of a bridge plate portion (55) constituting a mounting plate portion (54) via a welding flange portion (66). A reinforcing portion (65) constituted by a protrusion strip having a convex shape on the width direction outer side and a concave shape on the width direction inner side is provided from the upper end portion to the lower end portion of the front end portion of the pair of support plate portions (22a).

The invention relates to the field of petroleum and natural gas drilling tools, in particular to a screw drill motor stator, a screw drill motor and a forming method.The screw drill motor stator comprises a stator body, a rubber bushing is installed on the inner wall of the stator body, and a first spiral structure is arranged on the inner surface of the rubber bushing; in the stator body, sheaths are arranged at the two ends of the rubber bushing, the outer surfaces of the sheaths are fixedly connected with the stator body, and second spiral structures are arranged on the inner surfaces of the sheaths; the spiral line type of the first spiral structure is the same as the spiral line type of the second spiral structure. According to the motor stator, the second threaded surface is arranged on the inner surface of the sheath, so that the speed and the flow of drilling fluid passing through the motor stator can be increased on the basis of protecting the rubber bushing, and the motor stator has the advantage of improving the descending efficiency of the drilling fluid.

The utility model relates to steel pipe technical field, concretely is a seamless steel tube with pressure -relief structure, the rear end fixed setting ring seat of seamless steel pipe body, the inside of ring seat is equipped with annular groove, annular cylinder inserts to the inside of seamless steel pipe body, the rear end fixed setting ring frame of annular cylinder, ring frame inserts to the inside with annular groove screw thread connection of groove, the front end of annular cylinder is flush with the front end of seamless steel pipe body, this structure integrates pressure -relief structure in seamless steel pipe body, through the cooperation of ring frame, locating seat, spring and pressure -relief block, realizes the instantaneous response when water pressure mutation, when pressure exceeds threshold value, pressure -relief block compression spring expands the inside diameter pressure relief, avoids the plastic deformation or burst of steel pipe because of instantaneous overpressure, improves the operation safety of boiler system from the body structure level.