CN115126956A

CN115126956A - Non-metal expansion joint and production method thereof

Info

Publication number: CN115126956A
Application number: CN202210897719.4A
Authority: CN
Inventors: 罗凤; 吴新伟; 张勇; 何阳阳; 刘佳; 杨勇; 刘健
Original assignee: Deyang Dongqi Power Station Equipment Co ltd
Current assignee: Deyang Dongqi Power Station Equipment Co ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-09-30

Abstract

The invention provides a non-metal expansion joint which is arranged on an exhaust pipe of a medium-sized gas turbine, wherein the exhaust pipe comprises an air inlet section and an air outlet section, the air inlet section and the air outlet section are arranged at intervals and comprise a frame pipe, an expansion assembly and a flow guide pipe, two ends of the frame pipe are respectively communicated with the air inlet section and the air outlet section, and the middle section of the frame pipe is provided with an air passage in a surrounding manner; the expansion assembly comprises a skin, a heat-insulating cotton belt and two metal rings, the two metal rings are symmetrically sleeved on two sides of the air passage, the skin is arranged on the outer rings of the two metal rings in a surrounding manner, and the heat-insulating cotton belt is arranged between the two metal rings and the skin; the guide pipe is conical, one end with the large diameter of the guide pipe is hermetically connected with one side, close to the air inlet section, of the rack pipe, and a zigzag buffer cavity is formed among the guide pipe, the rack pipe and the air outlet section; the problems that under the condition of huge size, the flatness of a flange is difficult to guarantee, the coaxiality of welding of parts is high, cold cracks are easy to generate after welding and the like are solved.

Description

Non-metal expansion joint and production method thereof

Technical Field

The invention relates to the technical field of expansion joints, in particular to a non-metal expansion joint and a production method thereof.

Background

The nonmetal expansion joint can compensate axial direction, transverse direction and angular direction, has the characteristics of no thrust, simplified support design, corrosion resistance, high temperature resistance, noise elimination, vibration reduction and the like, and is particularly suitable for hot air pipelines and smoke dust pipelines. For the exhaust pipe of the medium-sized combustion engine, the working temperature of the high-temperature fuel gas is as high as about 650 ℃, so in order to avoid the thermal expansion of the medium-sized combustion engine caused by the exhaust temperature under the worst working condition, a nonmetal expansion joint is required to be installed on the exhaust diffusion section of the medium-sized combustion engine for solving the problem.

The size of the nonmetal expansion joint required by the medium-sized gas turbine exhaust pipe is large, the diameter of the medium-sized gas turbine exhaust pipe is about six meters generally, and due to the large size, the following problems need to be noticed in the process of producing the nonmetal expansion joint which can be correspondingly used:

(1) the nonmetal expansion joint is rigidly connected with the exhaust diffusion section of the gas turbine through a flange bolt, and seal welding is not carried out after assembly, so that the flatness of the flange of the nonmetal expansion joint is required to be ensured in order to avoid leakage of high-temperature gas (the working temperature is about 650 ℃);

(2) the diameter of the nonmetal expansion joint is large, the assembly welding gap between the parts is small, the welding amount is large, the assembly welding sequence of the parts needs to be determined, the welding deformation and the coaxiality of the parts are controlled, and the assembly welding, the machining and the transportation difficulty are large.

(3) The frame is a contour support of a non-metal expansion joint, sufficient strength and rigidity are guaranteed, the frame is made of materials which are adaptive to medium temperature and mainly made of stainless steel or heat-resistant steel, the heat-resistant steel is poor in welding performance, and cold cracks are easy to generate in an incomplete melting area and an overheating area during cooling in the welding process, so that a reasonable process scheme needs to be designed to prevent the generation of the cold cracks, and the quality of welding seams is guaranteed.

Disclosure of Invention

The invention aims to provide a non-metal expansion joint and a production method thereof, which solve the problems that the flange flatness is difficult to ensure, the coaxiality of welding of parts is difficult, cold cracks are easy to generate after welding and the like under the condition of huge size.

The embodiment of the invention is realized by the following technical scheme: a nonmetal expansion joint is arranged on an exhaust pipe of a medium-sized gas turbine, the exhaust pipe comprises an air inlet section and an air outlet section, the air inlet section and the air outlet section are arranged at intervals and comprise a frame pipe, an expansion assembly and a flow guide pipe, two ends of the frame pipe are respectively communicated with the air inlet section and the air outlet section, the end parts of the air inlet section and the air outlet section are arranged in the frame pipe, and an air passage is arranged at the middle section of the frame pipe in a surrounding manner;

the expansion assembly comprises a skin, a heat insulation cotton belt and two metal rings, the two metal rings are symmetrically sleeved on two sides of the air passage, and the skin is arranged on the outer rings of the two metal rings in a surrounding manner and used for sealing a gap between the two metal rings and preventing gas leakage and absorbing expansion amount; the heat-insulating cotton belt is arranged between the two metal rings and the skin;

the honeycomb duct is the toper, honeycomb duct major diameter one end with the frame pipe is close to air inlet section one side sealing connection, honeycomb duct minor diameter one end is located give vent to anger between section and the frame pipe, the honeycomb duct with the frame pipe and be formed with tortuous cushion chamber between the section of giving vent to anger, cushion chamber one end with the air flue intercommunication, the cushion chamber other end with air inlet section and the inner chamber intercommunication of the section of giving vent to anger.

Furthermore, the metal ring comprises a plurality of hollow round tables with different diameters, the hollow round tables are sequentially connected to form a ladder shape, and the distance between the outer rings of the two metal rings is larger than that between the inner rings of the two metal rings.

The metal ring fixing device further comprises a plurality of arched frames, the arched frames are arranged on the circumferences of the two metal rings in a surrounding mode, and two ends of each arched frame are connected with the two metal rings through bolts;

the arched truss comprises two arch plates, wherein one end of each arch plate is connected with one metal ring, a plurality of lock holes are formed in the other end of each arch plate at intervals, one end of each arch plate is connected with the other metal ring, a waist hole is formed in the other end of each arch plate, and the lock holes are matched with the waist holes and fixed through bolts.

Further, the heat insulation cotton belt comprises a first heat insulation cotton ring, a second heat insulation cotton ring and a third heat insulation cotton ring, the first heat insulation cotton ring and the second heat insulation cotton ring are respectively attached to the step parts of the two metal rings, a cavity is reserved between the first heat insulation cotton ring and the second heat insulation cotton ring, and the cavity is communicated with the air passage;

the third heat-preservation cotton ring is attached to the inner wall of the skin, and the inner annular wall of the third heat-preservation cotton ring is abutted to the first heat-preservation cotton ring and the second heat-preservation cotton ring.

The device is characterized by further comprising two taper pipes, wherein the two taper pipes are respectively arranged at two ends of the frame pipe, main flanges are respectively arranged at two ends of the frame pipe, an auxiliary flange is arranged at the large-diameter end of each taper pipe, and the main flanges are fixedly connected with the auxiliary flanges through bolts;

the taper pipe is sleeved on the air inlet section, and the small-diameter end of the taper pipe is hermetically connected with the air inlet section; and the other taper pipe is sleeved on the air outlet section, and the small-diameter end of the taper pipe is connected with the air outlet section in a sealing manner.

Further, still include the buffering ring, the buffering ring is located the cushion chamber, it is equipped with a plurality ofly to go out the interval cover on the section of giving vent to anger the buffering ring, the also interval cover of minor diameter section of honeycomb duct is equipped with a plurality of buffering rings.

Furthermore, the guide pipe device also comprises a plurality of rib plates, wherein one ends of the rib plates are connected with the rack pipe, and the other ends of the rib plates are connected with the inner cavity of the guide pipe.

Furthermore, the lifting device also comprises a plurality of lifting rings, and the pipe walls on the two sides of the rack pipe are symmetrically provided with the plurality of lifting rings in a surrounding manner.

A production method of a non-metal expansion joint is suitable for the implementation of the production of the non-metal expansion joint in any one step, and comprises the following steps:

s1, when producing the frame pipe, adding 10mm to the length of the frame pipe on the basis of the preset length to ensure the subsequent cutting allowance, blanking three metal plate strips with the same length according to the required size, manufacturing the three metal plate strips into arc plates with the radian of 120 degrees through a rolling bed, splicing the three arc plates into a cylindrical frame pipe through a plurality of tie bars, and performing spot welding at intervals between the adjacent arc plates;

s2, welding first steps of two metal rings on the frame pipe at intervals, wherein the first steps of the two metal rings are symmetrically arranged; the specific mode of welding the first step of the metal ring is as follows:

preheating a first-stage ladder of a frame pipe and a metal ring, welding a section of fan ring on each arc plate of the frame pipe, wherein the three fan rings are coaxially arranged and positioned on the same plane, welding a section of first arc plate at the outer arc end of each fan ring, and coaxially arranging and sequentially abutting the three first arc plates; during welding, spot welding is carried out firstly, and full welding is carried out after the angle is adjusted;

the first arc-shaped plates of the two first steps are positioned between the fan rings of the two first steps;

s3, after the first steps of the two metal rings are welded, cutting the first steps from the middle section of the rack pipe in a surrounding manner, and dividing the rack pipe into two sections of identical short rack pipes;

each main flange is composed of three sections of flange parts with the same radian, two main flanges are composed of six flange parts, the six flange parts are overlapped in pairs and are subjected to spot welding to form a group of sub-flanges, the three groups of sub-flanges are coaxially arranged between two short frame pipes, the sub-flanges and the two short frame pipes are preheated, two sides of each group of sub-flanges are respectively and vertically connected with the end parts of an arc plate of the two short frame pipes, the sub-flanges are subjected to spot welding firstly during connection, then process lugs are welded to enable the sub-flanges to be perpendicular to the short frame pipes, and finally the sub-flanges and the short frame pipes are subjected to full welding;

s4, welding the rest step part on the first step of the metal ring according to the mode of welding the first step, preheating before welding, adopting a mode of spot welding, adjusting the angle and then fully welding, and separating two overlapped sub-flanges after the metal ring is welded to obtain two sub-frame pipes with main flanges and metal rings;

s5, welding a flow guide pipe in the inner cavity of the sub-frame pipe with the main flange and the first-stage ladder of the metal ring, wherein the flow guide pipe is also in a three-section type, each section is welded with a corresponding arc plate, preheating is needed before welding, spot welding is needed, a rib plate is needed to be spot-welded, and full welding is needed after the three sections are respectively spot-welded and the angle is adjusted;

s6, welding a plurality of buffer rings on the draft tube at intervals, wherein each buffer ring is also three sections with equal radian, is respectively welded on the three sections of draft tubes and is positioned on the same plane; collectively referring the sub-frame pipes with the flow guide pipes as left frame pipes, and collectively referring the sub-frame pipes without the flow guide pipes as right frame pipes;

s7, respectively disassembling the left frame pipe and the right frame pipe into three sections with equal radian, polishing away welding spots formed by spot welding among the three arc plates, and respectively performing heat treatment on each section for eliminating internal stress after full welding;

s8, producing two taper pipes, each taper pipe is also in a three-section type with equal radian, assembling the taper pipes into a whole by using a lacing wire, then overlapping and spot-welding two auxiliary flanges, respectively placing the two taper pipes on two sides of the overlapped auxiliary flanges, respectively and vertically connecting the large-diameter ends of the two taper pipes with the two auxiliary flanges, wherein the two auxiliary flanges are also in a three-section type with equal radian, each section is respectively connected with one section of the corresponding taper pipe, preheating is carried out before welding, spot welding is carried out during welding, full welding is carried out after the angle is adjusted, a process lug is also needed to ensure that the two taper pipes with the auxiliary flanges are mutually vertical when the angle of the auxiliary flanges and the taper pipes is adjusted, and after the full welding is finished, the two taper pipes with the auxiliary flanges are disassembled into three-section types, and heat treatment is carried out to eliminate the internal stress;

s9, after all the parts are subjected to heat treatment, disassembling a process lug, reassembling the disassembled left frame pipe and right frame pipe into a circular whole through a lacing wire, reassembling the two conical pipes with auxiliary flanges into a conical cylinder, coaxially arranging the left frame pipe and the right frame pipe at intervals, arranging one ends of the left frame pipe and the right frame pipe with main flanges outside, installing a heat-insulating cotton tape and a skin between two metal rings, locking the skin and the metal rings through a plurality of arched truss arch slabs, connecting the two arched truss slabs of the arched truss to each other, further connecting and fixing the left frame pipe and the right frame pipe, and finally connecting the auxiliary flanges of the two conical pipes with the main flanges of the left frame pipe and the right frame pipe respectively to finish trial assembly and inspection of the nonmetal expansion joint whole;

and S10, after trial assembly is qualified, disassembling the parts without full welding into three small pieces, transporting the small pieces to the site, assembling and welding, sleeving the two taper pipes on the air inlet section and the air outlet section respectively, communicating the left frame pipe with the taper pipe on the air inlet section, extending the air outlet section to the inner cavity of the guide pipe, and welding all the three-section parts into a whole by adopting a nickel-based welding material without heat treatment.

Furthermore, the frame pipe, the metal ring, the flow guide pipe, the taper pipe, the rib plate, the buffer ring, the main flange and the auxiliary flange are all made of martensite and semi-austenite precipitation hardening stainless steel materials, and metal flaw detection is required to be carried out after all welding and heat treatment so as to test the quality of welding seams.

The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:

1. the welding machine is reasonable in design and simple in structure, the plurality of plates are rolled into the arc shape and then connected to form the cylinder, the cylinder is cut into the two small cylinders from the middle part, the coaxiality and the size of the main body of the frame pipe are further ensured, six sections of the two main flanges with equal radian are welded together in pairs, the two ends of the main flanges are respectively connected with the two small cylinders, and the flatness of the large-size main flange and the frame pipe after welding can be ensured by adopting the sectional back-to-back welding mode.

2. The frame pipe, the metal ring, the flow guide pipe, the taper pipe, the rib plate, the buffer ring, the main flange and the auxiliary flange are all formed by three sections with equal radians, and the sectional operation is convenient for welding, transportation, heat treatment and the like, and can also be convenient for adjustment, so that the whole coaxiality is ensured.

3. All welding needs preheating, heat preservation, spot welding, full welding, flaw detection and heat treatment flaw detection during production, and nickel-based welding materials are adopted for welding when all three sections of small pieces are assembled and connected on site, so that the problems that cold cracks are easy to generate after welding and the like are solved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic half-section view of a non-metallic expansion joint according to the present invention;

FIG. 2 is a schematic view of an assembly of a non-metallic expansion joint according to the present invention;

FIG. 3 is a schematic structural view of a non-metallic expansion joint welded to a main flange according to the present invention;

FIG. 4 is a schematic structural view of a non-metallic expansion joint according to the present invention after the main flanges are welded and separated;

FIG. 5 is a flow chart of a method for producing a non-metallic expansion joint according to the present invention;

icon: 1. air inlet section, 2, air outlet section, 3, frame pipe, 4, honeycomb duct, 5, skin, 6, heat preservation cotton belt, 7, metal ring, 8, air flue, 9, buffer chamber, 10, arch-shaped building frame, 11, arch bar, 12, lockhole, 13, waist hole, 14, first heat preservation cotton ring, 15, second heat preservation cotton ring, 16, third heat preservation cotton ring, 17, taper pipe, 18, buffer ring, 19, gusset, 20, rings, 21, main flange, 22, auxiliary flange.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 4, this embodiment provides a non-metal expansion joint, the setting is on medium-sized combustion engine blast pipe, the blast pipe includes section 1 and the section 2 of giving vent to anger of admitting air, inside gas flows toward section 2 of giving vent to anger from section 1 of admitting air, section 1 and the section 2 interval setting of giving vent to anger of admitting air, including frame pipe 3, expansion assembly and honeycomb duct 4, the both ends of frame pipe 3 communicate with section 1 and the section 2 of giving vent to anger of admitting air respectively, section 1 and the tip of the section 2 of giving vent to anger of admitting air all arrange frame pipe in 3, frame pipe 3 middle section is encircleed and is seted up air flue 8, gas enters into air flue 8 from the clearance between section 1 and the section 2 of giving vent to anger when blast pipe is inside to produce malleation and negative pressure, and then be used for malleation and negative pressure through expansion assembly.

As shown in fig. 1, the expansion assembly comprises a skin 5, a heat preservation cotton belt 6 and two metal rings 7, wherein the two metal rings 7 are symmetrically sleeved on two sides of an air passage 8, the skin 5 is arranged on the outer rings of the two metal rings 7 in a surrounding manner and used for sealing a gap between the two metal rings 7, the skin 5 is annular and is a main telescopic body of a non-metal expansion joint, is formed by compounding multiple layers of silicon rubber or high silica polytetrafluoroethylene with excellent performance and alkali-free glass floss and the like, is a high-strength sealing composite material and has the functions of preventing the leakage of gas and rainwater and absorbing the expansion amount;

the heat-insulating cotton belt 6 is arranged between the two metal rings 7 and the skin 5, the heat-insulating cotton has double functions of heat insulation and air tightness of the nonmetal expansion joint, and consists of glass fiber cloth, high silica cloth, various heat-insulating cotton felts and the like, the length and the width of the heat-insulating cotton belt are consistent with those of the skin on the outer layer, and the heat-insulating cotton belt has good extensibility and tensile strength.

As shown in fig. 1, honeycomb duct 4 is the toper, honeycomb duct 4 major diameter one end and frame pipe 3 are close to section 1 one side sealing connection that admits air, honeycomb duct 4 minor diameter one end is located between section 2 and the frame pipe 3 of giving vent to anger, be formed with tortuous cushion chamber 9 between honeycomb duct 4 and frame pipe 3 and the section 2 of giving vent to anger, cushion chamber 9 one end and air flue 8 intercommunication, the cushion chamber 9 other end and the section 1 of admitting air and the inner chamber intercommunication of the section 2 of giving vent to anger, during the concrete implementation, when the blast pipe produced the malleation, gas is via the anomalous cushion chamber of tortuous, the impact volume of high temperature gas direct impact covering 5 has been reduced, the life of equipment has been prolonged to a certain extent.

The becket 7 contains the hollow round platform of a plurality of different diameters, a plurality of hollow round platforms connect gradually and are the echelonment, distance between 7 outer rings of two becketens is greater than the distance between its inner ring, as shown in figure 1, during the concrete implementation, becket 7 is the shape of multistage round platform, not only be higher than traditional straight board structural strength, can bear bigger positive negative pressure, increased the area with 6 contacts in the cotton area of heat preservation simultaneously, help the installation in the cotton area of heat preservation and fixed when having promoted the heat preservation effect, the flexible volume of nonmetal expansion joint is guaranteed to bigger volume, structural strength is also high.

As shown in fig. 1 and 2, the air duct structure further comprises a plurality of arched bridging frames 10, wherein the arched bridging frames 10 are arranged on the circumferences of the two metal rings 7 in a surrounding manner, and two ends of each arched bridging frame 10 are respectively connected with the two metal rings 7 through bolts, so that when the skin 5 and the metal rings 7 are fixed, the relative position relation of the frame tube 3 which is cut into two sections is ensured, and meanwhile, the size of the air duct 8 is ensured to be unchanged;

during specific implementation, the arch truss 10 comprises two arch plates 11, one end of one arch plate 11 is connected with one metal ring 7, a plurality of lock holes 12 are arranged at intervals at the other end of the arch plate, one end of the other arch plate 11 is connected with the other metal ring 7, a waist hole 13 is arranged at the other end of the other arch plate, the lock holes 12 are matched with the waist hole 13 and fixed through bolts, the distance between the two arch plates of the arch truss 10 can be conveniently adjusted, the distance between the two metal rings 7 can be adjusted according to the field installation condition, the length of the frame pipe 3 can be further adjusted, and the error that the left installation distance and the right installation distance are insufficient sometimes is overcome.

As shown in fig. 1, the heat-insulating cotton belt 6 includes a first heat-insulating cotton ring 14, a second heat-insulating cotton ring 15 and a third heat-insulating cotton ring 16, the first heat-insulating cotton ring 14 and the second heat-insulating cotton ring 15 are respectively attached to the step parts of the two metal rings 7, a cavity is left between the first heat-insulating cotton ring 14 and the second heat-insulating cotton ring 15, the cavity is communicated with the air passage 8, so that normal circulation of air is ensured, and the temperature is prevented from being dissipated from the metal rings 7;

the cotton ring 16 laminating of third heat preservation sets up on covering 5 inner wall, and the cotton ring 15 butt of inner ring wall and first heat preservation of the cotton ring of third heat preservation 16 and second heat preservation, during the concrete implementation, the third keeps warm and has supported and protected covering 5 to a certain extent to the face, has slowed down the harm of positive negative pressure to covering 5 to a certain extent.

As shown in fig. 1, the pipe fitting further comprises two taper pipes 17, the two taper pipes 17 are respectively arranged at two ends of the frame pipe 3, two ends of the frame pipe 3 are both provided with a main flange 21, a large-diameter end of the taper pipe 17 is provided with an auxiliary flange 22, and the main flange 21 is fixedly connected with the auxiliary flange 22 through bolts;

a taper pipe 17 is sleeved on the air inlet section 1, one end of the air inlet section 1 close to the air outlet section 2 extends into the taper pipe 17 at the side, even can extend into the frame pipe 3, and the small-diameter end of the taper pipe 17 is hermetically connected with the air inlet section 1; another taper pipe 17 is sleeved on the air outlet section 2, one end of the air outlet section 2 close to the air inlet section 1 extends into the side taper pipe 17 and extends into the frame pipe 3, a small gap is reserved between the air outlet section 2 and the air inlet section 1, the size of the air outlet section is preferably slightly larger than that of the air inlet section 1, high-speed gas is prevented from directly rushing into the buffer cavity 9, and the small-diameter end of the taper pipe 17 is hermetically connected with the air outlet section 2.

Still including cushion ring 18, cushion ring 18 is located cushion chamber 9, and the spacer sleeve is equipped with a plurality of cushion rings 18 on the section 2 of giving vent to anger, and the little diameter section of honeycomb duct 4 is also the spacer sleeve to be equipped with a plurality of cushion rings 18, as shown in fig. 1, during concrete implementation, a plurality of cushion rings 18 are used for slowing down the high temperature air current that enters into cushion chamber 9, have slowed down the impact of air current to covering 5 to a certain extent.

Still include a plurality of gusset 19, a plurality of gusset 19 one end are connected with frame pipe 3, and the other end is connected with honeycomb duct 4 inner chamber, as shown in figure 1, during the concrete implementation, a plurality of gusset 19 mainly used fix honeycomb duct 4 and frame pipe 3 and be connected, prevent honeycomb duct 4 and drop when receiving high pressure impact.

The hoisting device further comprises a plurality of hoisting rings 20, the hoisting rings 20 are symmetrically arranged on the pipe walls on the two sides of the frame pipe 3 in a surrounding mode, and the hoisting rings 20 are mainly used for installing and hoisting metal expansion joints.

As shown in fig. 1 to 5, a method for producing a non-metallic expansion joint, which is suitable for the implementation of the method for producing a non-metallic expansion joint in any one of the steps, comprises the following steps:

s1, when the rack pipe 3 is produced, the length of the rack pipe 3 needs to be 10mm on the basis of the preset length to ensure the follow-up cutting allowance, three metal plate strips with the same length are blanked according to the required size, the three metal plate strips are made into arc plates with the radian of 120 degrees through a rolling bed, the three arc plates are spliced into the cylindrical rack pipe 3 through a plurality of tie bars, and the adjacent arc plates are subjected to spot welding at intervals;

s2, welding first-stage steps of two metal rings 7 on the frame pipe 3 at intervals, wherein the first-stage steps of the two metal rings 7 are symmetrically arranged, and the two metal rings are welded firstly, so that the problem that after the main flange 21 is welded, the main flange blocks some metal rings 7, and the metal rings 7 are not welded well is avoided; the first step of welding the metal ring 7 is specifically as follows:

preheating a first-stage ladder of a frame tube 3 and a metal ring 7, welding a section of sector ring on each arc plate of the frame tube 3, wherein the three sector rings are coaxially arranged and positioned on the same plane, welding a section of first arc plate at the outer arc end of each sector ring, and coaxially arranging and sequentially abutting the three first arc plates; during welding, spot welding is carried out firstly, full welding is carried out after the angle is adjusted, and triangular supports are required to be welded after the angle is adjusted, so that the perpendicularity of the supports is guaranteed, and the supports cannot be inclined in the full welding process;

s3, after the first steps of the two metal rings 7 are welded, cutting the middle section of the frame pipe 3 in a surrounding manner, and dividing the frame pipe 3 into two sections of same short frame pipes;

each main flange 21 is composed of three sections of flange parts with the same radian, two main flanges 21 are composed of six flange parts, the six flange parts are overlapped in pairs and are subjected to spot welding to form a group of sub-flanges, the three groups of sub-flanges are coaxially arranged between two short frame pipes, the sub-flanges and the two short frame pipes are preheated, two sides of each group of sub-flanges are respectively and vertically connected with the end parts of an arc plate of the two short frame pipes, the sub-flanges are subjected to spot welding firstly during connection, then process lugs are welded to enable the sub-flanges to be perpendicular to the short frame pipes, and finally the sub-flanges and the short frame pipes are subjected to full welding;

s4, welding the rest step part on the first step of the metal ring 7 according to the mode of welding the first step, preheating before welding, adopting a mode of spot welding firstly, adjusting the angle and then fully welding, and separating two overlapped sub-flanges after the welding of the metal ring 7 is finished to obtain two sub-frame pipes with the main flange 21 and the metal ring 7;

s5, welding a flow guide pipe 4 in an inner cavity of a sub-frame pipe with a main flange 21 and a first-stage ladder of a metal ring 7, wherein the flow guide pipe 4 is also in three sections, each section is welded with a corresponding circular arc plate, preheating is needed before welding, spot welding is needed, an upper rib plate 19 is subjected to spot welding, and full welding is carried out after the three sections are subjected to spot welding respectively and angles are adjusted;

s6, welding a plurality of buffer rings 18 on the draft tube 4 at intervals, wherein each buffer ring 18 is also three sections with equal radian, is respectively welded on the three sections of draft tubes 4 and is positioned on the same plane; the sub-rack pipes with the flow guide pipe 4 are collectively called as left rack pipes, and the sub-rack pipes without the flow guide pipe 4 are collectively called as right rack pipes;

s8, producing two taper pipes 17, wherein each taper pipe 17 is also a three-section type with equal radian, assembling a whole by using a tie bar, overlapping and spot-welding two auxiliary flanges 22, respectively placing the two taper pipes 17 at two sides of the overlapped auxiliary flanges 22, vertically connecting the large-diameter ends of the two taper pipes 17 with the two auxiliary flanges 22, respectively connecting the two auxiliary flanges 22 with equal radian and each section with a section of the corresponding taper pipe 17, preheating before welding, spot-welding when welding, fully welding after adjusting the angle, ensuring the mutual perpendicularity of the two taper pipes 17 with the auxiliary flanges 22 by using a process lug when adjusting the angle of the auxiliary flanges 22 and the taper pipes 17, disassembling the two taper pipes 17 with the auxiliary flanges 22 into three-section types after fully welding, and carrying out heat treatment to eliminate the internal stress;

s9, after all parts are subjected to heat treatment, disassembling a process lug, reassembling the disassembled left frame pipe and right frame pipe into a circular whole through a lacing wire, reassembling the two conical pipes 17 with auxiliary flange 22 discs into a conical cylinder, coaxially arranging the left frame pipe and the right frame pipe at intervals, arranging one ends of the left frame pipe and the right frame pipe with a main flange 21 outside, then installing a heat-insulating cotton belt 6 and a skin 5 between the two metal rings 7, locking the skin 5 and the metal rings 7 through the arch plates 11 of the arch brackets 10, then mutually connecting the two arch plates 11 of the arch brackets 10, further connecting and fixing the left frame pipe and the right frame pipe, and finally connecting the auxiliary flanges 22 of the two conical pipes 17 with the main flanges 21 of the left frame pipe and the right frame pipe respectively to finish the trial assembly and the inspection of the nonmetal expansion joint whole;

s10, after trial assembly is qualified, parts without full welding of the whole are disassembled into three small pieces, the small pieces are transported to the site and then assembled and welded, the two taper pipes 17 are respectively sleeved on the air inlet section 1 and the air outlet section 2, the left stand pipe is communicated with the taper pipe 17 on the air inlet section 1, the air outlet section 2 extends to the inner cavity of the flow guide pipe 4, and all three-section parts are welded by nickel-based welding materials without heat treatment when being welded into a whole.

The frame pipe 3, the metal ring 7, the flow guide pipe 4, the taper pipe 17, the rib plate 19, the buffer ring 18, the main flange 21 and the auxiliary flange 22 are all made of martensite and semi-austenite precipitation hardening stainless steel materials, and metal flaw detection is required to be carried out after all welding and heat treatment so as to test the quality of welding seams.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a nonmetal expansion joint, sets up on medium-sized combustion engine blast pipe, the blast pipe is including admitting air section (1) and giving vent to anger section (2), admit air section (1) and give vent to anger section (2) interval setting, its characterized in that: the air-inlet and air-outlet combined type air-conditioner comprises a frame pipe (3), an expansion assembly and a flow guide pipe (4), wherein two ends of the frame pipe (3) are respectively communicated with an air inlet section (1) and an air outlet section (2), the end parts of the air inlet section (1) and the air outlet section (2) are arranged in the frame pipe (3), and an air passage (8) is formed in the middle section of the frame pipe (3) in a surrounding manner;

the expansion assembly comprises a skin (5), a heat-insulating cotton belt (6) and two metal rings (7), the two metal rings (7) are symmetrically sleeved on two sides of the air passage (8), and the skin (5) is arranged on the outer rings of the two metal rings (7) in a surrounding manner and used for sealing a gap between the two metal rings (7) and preventing gas leakage and absorbing expansion amount; the heat-insulating cotton belt (6) is arranged between the two metal rings (7) and the skin (5);

honeycomb duct (4) are the toper, honeycomb duct (4) major diameter one end with frame pipe (3) are close to admit air section (1) one side sealing connection, honeycomb duct (4) minor diameter one end is located give vent to anger between section (2) and the frame pipe (3), honeycomb duct (4) with frame pipe (3) and give vent to anger and be formed with tortuous cushion chamber (9) between section (2), cushion chamber (9) one end with air flue (8) intercommunication, cushion chamber (9) other end with admit air section (1) and the inner chamber intercommunication of the section (2) of giving vent to anger.

2. The non-metallic expansion joint according to claim 1, wherein the metal ring (7) comprises a plurality of hollow circular truncated cones with different diameters, the plurality of hollow circular truncated cones are sequentially connected to form a step shape, and the distance between the outer rings of the two metal rings (7) is greater than the distance between the inner rings thereof.

3. The non-metallic expansion joint according to claim 2, further comprising a plurality of arched bridges (10), wherein the plurality of arched bridges (10) are circumferentially arranged on the two metal rings (7), and two ends of each arched bridge (10) are respectively connected with the two metal rings (7) through bolts;

arch truss (10) include two arch bars (11), one the one end of arch bar (11) with one becket (7) are connected, and its other end interval is provided with a plurality of lockholes (12), another arch bar (11) one end and another becket (7) are connected, and its other end is provided with waist hole (13), lockhole (12) with waist hole (13) cooperation is through the bolt fastening.

4. The nonmetal expansion joint according to claim 2, wherein the heat-insulating cotton belt (6) comprises a first heat-insulating cotton ring (14), a second heat-insulating cotton ring (15) and a third heat-insulating cotton ring (16), the first heat-insulating cotton ring (14) and the second heat-insulating cotton ring (15) are respectively attached to the step parts of the two metal rings (7), and a cavity is reserved between the first heat-insulating cotton ring (14) and the second heat-insulating cotton ring (15) and is communicated with the air passage (8);

the third heat-preservation cotton ring (16) is attached to the inner wall of the skin (5), and the inner annular wall of the third heat-preservation cotton ring (16) is abutted to the first heat-preservation cotton ring (14) and the second heat-preservation cotton ring (15).

5. The non-metal expansion joint according to claim 1, further comprising two taper pipes (17), wherein the two taper pipes (17) are respectively arranged at two ends of the frame pipe (3), main flanges (21) are arranged at two ends of the frame pipe (3), an auxiliary flange (22) is arranged at a large-diameter end of each taper pipe (17), and the main flanges (21) are fixedly connected with the auxiliary flanges (22) through bolts;

the taper pipe (17) is sleeved on the air inlet section (1), and the small-diameter end of the taper pipe (17) is connected with the air inlet section (1) in a sealing way; and the other conical pipe (17) is sleeved on the air outlet section (2), and the small-diameter end of the conical pipe (17) is hermetically connected with the air outlet section (2).

6. The non-metal expansion joint according to claim 5, further comprising a buffer ring (18), wherein the buffer ring (18) is located in the buffer chamber (9), the buffer ring (18) is disposed on the gas outlet section (2) in a spaced manner, and the buffer ring (18) is disposed on the small diameter section of the flow guide pipe (4) in a spaced manner.

7. A non-metal expansion joint according to claim 5, characterized by further comprising a plurality of rib plates (19), wherein one end of each rib plate (19) is connected with the frame pipe (3), and the other end of each rib plate (19) is connected with the inner cavity of the flow guide pipe (4).

8. The non-metallic expansion joint according to claim 5, characterized in that the non-metallic expansion joint further comprises a plurality of lifting rings (20), and the lifting rings (20) are symmetrically arranged on the tube walls of the two sides of the frame tube (3) in a surrounding manner.

9. A method for producing a non-metallic expansion joint, which is suitable for the implementation of the production of the non-metallic expansion joint as claimed in any one of claims 1 to 8, and is characterized by comprising the following steps:

s1, when the frame pipe (3) is produced, the length of the frame pipe (3) needs to be 10mm on the basis of the preset length to ensure the subsequent cutting allowance, three metal plate strips with the same length are blanked according to the required size, the three metal plate strips are made into arc plates with the radian of 120 degrees through a rolling bed, the three arc plates are spliced into the cylindrical frame pipe (3) through a plurality of tie bars, and the adjacent arc plates are subjected to spot welding at intervals;

s2, welding first steps of two metal rings (7) on the frame pipe (3) at intervals, wherein the first steps of the two metal rings (7) are symmetrically arranged; the specific mode of welding the first step of the metal ring (7) is as follows:

preheating a first-stage ladder of a frame pipe (3) and a metal ring (7), welding a section of sector ring on each arc plate of the frame pipe (3), wherein the three sector rings are coaxially arranged and positioned on the same plane, welding a section of first arc plate at the outer arc end of each sector ring, and coaxially arranging and sequentially abutting the three first arc plates; during welding, spot welding is carried out firstly, and full welding is carried out after the angle is adjusted;

s3, after the first steps of the two metal rings (7) are welded, cutting the middle section of the frame pipe (3) in a surrounding manner, and dividing the frame pipe (3) into two sections of same short frame pipes;

each main flange (21) is composed of three sections of flange parts with the same radian, two main flanges (21) are composed of six flange parts, the six flange parts are overlapped in pairs and are subjected to spot welding to form a group of sub-flanges, the three groups of sub-flanges are coaxially arranged between two short frame pipes, the sub-flanges and the two short frame pipes are preheated, two sides of each group of sub-flanges are respectively and vertically connected with the end parts of an arc plate of the two short frame pipes, spot welding is carried out during connection, then a process lug is welded to enable the sub-flanges to be vertical to the short frame pipes, and finally the sub-flanges and the short frame pipes are fully welded;

s4, welding the rest step part on the first step of the metal ring (7) according to the mode of welding the first step, preheating before welding, adopting a mode of spot welding, adjusting the angle and then fully welding, and separating two overlapped sub-flanges after the welding of the metal ring (7) is finished to obtain two sections of sub-frame pipes with the main flange (21) and the metal ring (7);

s5, welding a flow guide pipe (4) in the inner cavity of the sub-rack pipe with the main flange (21) and the first step of the metal ring (7), wherein the flow guide pipe (4) is also in a three-section type, each section is welded with a corresponding arc plate, preheating is needed before welding, spot welding is needed, a rib plate (19) is needed to be spot-welded, and full welding is needed after the three sections are respectively spot-welded and the angles are adjusted;

s6, welding a plurality of buffer rings (18) on the draft tube (4) at intervals, wherein each buffer ring (18) is also three sections with equal radian, is respectively welded on the three sections of draft tubes (4), and is positioned on the same plane; collectively referring the sub-frame pipes with the flow guide pipe (4) as left frame pipes, and collectively referring the sub-frame pipes without the flow guide pipe (4) as right frame pipes;

s7, respectively disassembling the left frame pipe and the right frame pipe into three sections with equal radian, polishing away welding spots formed by spot welding among the three arc plates, and respectively performing heat treatment on each section for eliminating the internal stress after full welding;

s8, producing two taper pipes (17), wherein each taper pipe (17) is also in a three-section type with equal radian, assembling the taper pipes into a whole by using a tie bar, overlapping and spot-welding two auxiliary flanges (22), respectively placing the two taper pipes (17) at two sides of the overlapped auxiliary flanges (22), respectively and vertically connecting the large-diameter ends of the two taper pipes (17) with the two auxiliary flanges (22), wherein the two auxiliary flanges (22) are also in a three-section type with equal radian, each section is respectively connected with one section of the corresponding taper pipe (17), preheating before welding, spot-welding during welding, fully welding after adjusting the angle, when adjusting the angle between the auxiliary flange (22) and the taper pipe (17), also needing a process lug to ensure that the two taper pipes are mutually perpendicular, after fully welding, disassembling the two taper pipes (17) with the auxiliary flanges (22) into a three-section type, and carrying out heat treatment to eliminate internal stress;

s9, after all the parts are heat treated, disassembling the process lug, reassembling the disassembled left frame pipe and right frame pipe into a circular whole by a lacing wire, reassembling two conical pipes (17) with auxiliary flange (22) discs into a conical cylinder, arranging the left frame pipe and the right frame pipe coaxially and at intervals, placing one end with a main flange (21) on the outer side, installing a heat insulation cotton belt (6) and a skin (5) between two metal rings (7), locking the skin (5) and the metal rings (7) by using a plurality of arch plates (11) of an arch bracket (10), then connecting the two arch plates (11) of the arch bracket (10) with each other, further connecting and fixing the left frame pipe and the right frame pipe, and finally connecting the auxiliary flanges (22) of the two conical pipes (17) with the main flanges (21) of the left frame pipe and the right frame pipe respectively, completing the whole trial assembly and inspection of the nonmetal expansion joint;

s10, after trial assembly is qualified, parts without full welding of the whole are disassembled into three small pieces, the small pieces are transported to the site and then assembled and welded, the two taper pipes (17) are respectively sleeved on the air inlet section (1) and the air outlet section (2), the left frame pipe is communicated with the taper pipe (17) on the air inlet section (1), the air outlet section (2) extends to the inner cavity of the flow guide pipe (4), and all three-section parts are welded into a whole by adopting nickel-based welding materials without heat treatment.

10. The non-metallic expansion joint and the production method thereof according to claim 9, wherein the frame tube (3), the metal ring (7), the draft tube (4), the taper tube (17), the rib plate (19), the buffer ring (18), the main flange (21) and the auxiliary flange (22) are made of martensite and semi-austenite precipitation hardening stainless steel, and metal flaw detection is required after all welding and heat treatment to check the quality of the welding seam.