CN112157400A - Manufacturing method of 200L liquefied natural gas low-temperature and low-pressure gas cylinder for automobile - Google Patents
Manufacturing method of 200L liquefied natural gas low-temperature and low-pressure gas cylinder for automobile Download PDFInfo
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Abstract
A method for manufacturing a 200L low-temperature and low-pressure liquefied natural gas cylinder for an automobile comprises the steps of rolling a steel plate into a liner cylinder, welding two ends of the liner cylinder with two punch-formed liner sealing covers to obtain a gas cylinder liner, inserting a distribution head into the liner sealing cover at one end of the liner cylinder, welding and fixing the liner cylinder, testing the pressure of the gas cylinder liner, rolling a shell cylinder, welding the shell sealing covers at two ends of the shell cylinder, welding an opening of the shell sealing cover with the distribution head to form a vacuum interlayer between the outer wall of the gas cylinder liner and the inner wall of a gas cylinder shell, sequentially performing helium leakage detection and vacuumizing, polishing the outer surface of the gas cylinder, and finally installing a valve pipeline assembly. The design not only ensures that the product quality can meet the requirements, but also is convenient for streamlined production.
Description
Technical Field
The invention belongs to the field of automobile gas cylinder manufacturing, and particularly relates to a method for manufacturing a 200L liquefied natural gas low-temperature low-pressure gas cylinder for an automobile.
Background
LNG (liquefied natural gas) automobiles are a new generation of natural gas automobiles using low-temperature liquid natural gas as a fuel, have the characteristics of good environmental protection, high safety performance, low price, large storage density, long driving range and the like, and are widely applied to the automobile industry. The LNG gas cylinder is used as a device for storing LNG, the performance of the whole vehicle can be influenced by the performance of the LNG gas cylinder, and a unified method is not provided for the manufacturing process of the LNG gas cylinder at present, so that the production quality of the LNG gas cylinder cannot be ensured, and the vehicle-mounted assembly and use requirements can be met.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a method for manufacturing a 200L low-temperature and low-pressure liquefied natural gas cylinder for an automobile, wherein the product quality can meet the requirement and the streamlined production is convenient.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a method for manufacturing a 200L liquefied natural gas low-temperature and low-pressure gas cylinder for an automobile comprises a gas cylinder liner, a gas cylinder shell and a distribution head which are coaxially arranged, the inner container of the gas cylinder consists of an inner container barrel which is hollow and cylindrical, a first inner container sealing cover which is positioned at the top end of the inner container barrel and a second inner container sealing cover which is positioned at the bottom end of the inner container barrel, the gas cylinder shell consists of a shell barrel body sleeved outside the inner container barrel body, a first outer shell sealing cover sleeved outside the first inner container sealing cover, and a second outer shell sealing cover sleeved outside the second inner container sealing cover, a vacuum interlayer is formed between the outer wall of the gas cylinder liner and the inner wall of the gas cylinder shell, the distribution head is of a columnar structure, a gas cylinder valve pipeline assembly is assembled at the upper end of the distribution head, the middle outer periphery of the distribution head is welded with the upper ends of the first liner sealing cover and the first shell sealing cover, and the lower end of the distribution head 3 is inserted into the first liner sealing cover;
the manufacturing method of the gas cylinder sequentially comprises the following steps:
rolling the inner container plate, and rolling the steel plate into an inner container barrel according to a specified size by using a plate rolling machine;
welding the liner, namely welding a connecting longitudinal seam on a rolled liner barrel by using an automatic welding machine, then sequentially welding a first liner sealing cover formed by stamping to the top end of the liner barrel, and welding a second liner sealing cover formed by stamping to the bottom end of the liner barrel to obtain a gas cylinder liner, and then performing nondestructive flaw detection on the welding seam by using a ray detector;
welding the distribution head, namely inserting the distribution head into the first liner sealing cover, welding the middle outer periphery of the distribution head with the opening of the first liner sealing cover, and performing nondestructive inspection on a welding line by using a ray detector;
testing pressure, adopting a pressure testing tool to test the pressure bearing capacity of the gas cylinder liner, and detecting whether a welding seam has leakage;
rolling the shell into a plate, and rolling the steel plate into a shell cylinder according to the specified size by adopting a plate rolling machine;
welding a shell, namely welding a second shell sealing cover which is subjected to stamping forming to the bottom end of a shell cylinder body, then welding a first shell sealing cover which is subjected to stamping forming to the top end of the shell cylinder body, and welding an opening of the first shell sealing cover and the middle outer periphery of the distribution head to form a vacuum interlayer between the outer wall of the gas cylinder liner and the inner wall of the gas cylinder shell;
helium leakage detection and vacuumizing, namely placing a gas cylinder in a helium environment, measuring the leakage rate of a vacuum interlayer by using a leakage detector, and vacuumizing the vacuum interlayer;
polishing, namely polishing the outer surface of the gas cylinder by using a polishing machine;
assembling the valve pipeline assembly, connecting the gas cylinder valve pipeline assembly with the distribution head, and then carrying out an airtight test on the gas cylinder.
A fixed block is arranged in the vacuum interlayer, the top end of the fixed block is welded with the outer wall of the bottom end of the second liner sealing cover, and the bottom end of the fixed block is welded with the inner wall of the bottom end of the second outer shell sealing cover;
in the step of welding the inner container, after the inner container of the gas cylinder is obtained, the top end of the fixed block is welded with the outer wall of the bottom end of the second inner container sealing cover;
in the step of welding the shell, the bottom end of the fixing block is welded with the inner wall of the bottom end of the second shell sealing cover before the first shell sealing cover and the shell cylinder are welded.
In the step of rolling the inner container plate and the outer shell plate, the misalignment amount of the joint after rolling is not more than +/-0.1 Sn, wherein Sn is the thickness of a steel plate.
In the step of welding the inner container, the gas storage amount of an automatic welding machine is not lower than 10bar, arc leading and extinguishing plates are adopted to ensure smooth transition of welding seams, the edge angle of the welding seams is not more than +/-0.1 Sn +2mm during longitudinal seam welding, the misalignment amount of the connecting parts is not more than +/-0.1 Sn, the rest height of the welding seams is 0-2.5mm, the width of the welding seams is not more than 3mm, the welding current and the welding voltage are respectively 180 plus and minus 210A and 24-26V during circumferential welding, the edge angle of the welding seams is not more than +/-0.1 Sn +2mm, the misalignment amount of the connecting parts is not more than +/-0.25 Sn, the rest height of the welding seams is 0-2.5mm, and the width of the welding;
in the shell welding step, the axial height of the part of the distribution head 3, which is positioned outside the gas cylinder shell 2, is 36-38mm, the gas storage amount of an automatic welding machine is not lower than 10bar, and an arc leading and extinguishing plate is adopted to ensure smooth transition of a welding seam, during longitudinal seam welding, the edge angle of the welding seam is not more than +/-0.1 Sn +2mm, the edge misalignment amount of a joint is not more than +/-0.1 Sn, the residual height of the welding seam is 0-1.5mm, the width of the welding seam is not more than 3mm, during circumferential welding, the welding current and the welding voltage are respectively 180 DEG and 210A and 24-26V, the edge angle of the welding seam is not more than +/-0.1 Sn +2mm, the edge misalignment amount of the joint is not more than 0.25Sn, the residual height of the welding seam is 0-;
wherein Sn is the thickness of the steel plate.
In the pressure testing step, the method for testing the pressure bearing capacity comprises the following steps: gradually increasing the pressure to 3.18MPa in the gas cylinder liner 1, maintaining the pressure for 4-6min, and judging to be qualified if the gas cylinder liner 1 is not abnormal in the process.
In the helium leakage detection and vacuum pumping steps, the leakage rate needs to be less than 10-9Pa·m3S, vacuum degree less than or equal to 10-2Pa。
In the polishing step, a 180# nylon polishing belt is adopted by the polishing machine.
In the step of assembling the valve pipeline assembly, the valve pipeline assembly comprises a valve, an air supply pipeline and a safety valve, and the air tightness test is as follows:
gradually increasing the pressure inside the gas cylinder to 1.59MPa, maintaining the pressure for 2-4min, and checking whether bubbles emerge at the positions of a valve, a gas supply pipeline and a welding line of the gas cylinder by using soapy water in the process.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a method for manufacturing a 200L liquefied natural gas low-temperature and low-pressure gas cylinder for an automobile, which comprises the steps of rolling a steel plate into an inner container barrel, respectively welding two ends of the inner container barrel with two punch-formed inner container sealing covers to obtain a gas cylinder inner container, inserting a distribution head into the inner container sealing cover at one end, welding and fixing the distribution head, carrying out pressure test on the gas cylinder inner container, rolling a shell barrel, welding the shell sealing covers at two ends of the shell barrel, welding an opening of the shell sealing cover with the distribution head to form a vacuum interlayer between the outer wall of the gas cylinder inner container and the inner wall of a gas cylinder shell, sequentially carrying out helium leak detection, vacuumizing, polishing the outer surface of the gas cylinder, and finally installing a valve pipeline assembly. Therefore, the invention not only ensures that the product quality can meet the requirement, but also is convenient for the streamlined production.
Drawings
Fig. 1 is a schematic structural view of the gas cylinder of the present invention.
In the figure, a gas cylinder liner 1, a liner cylinder body 11, a first liner sealing cover 12, a second liner sealing cover 13, a gas cylinder shell 2, a shell cylinder body 21, a first shell sealing cover 22, a second shell sealing cover 23, a distribution head 3, a vacuum interlayer 4, a fixed block 41 and a gas cylinder valve pipeline component 5.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
A method for manufacturing a 200L liquefied natural gas low-temperature and low-pressure gas cylinder for an automobile,
referring to fig. 1, the gas cylinder comprises a gas cylinder liner 1, a gas cylinder shell 2 and a distribution head 3 which are coaxially arranged, the gas cylinder liner 1 is composed of a cylindrical liner cylinder 11 which is hollow inside, a first liner sealing cover 12 which is positioned at the top end of the liner cylinder 11 and a second liner sealing cover 13 which is positioned at the bottom end of the liner cylinder 11, the gas cylinder shell 2 is composed of a shell cylinder 21 which is sleeved outside the liner cylinder 11, a first outer shell sealing cover 22 which is sleeved outside the first liner sealing cover 12 and a second outer shell sealing cover 23 which is sleeved outside the second liner sealing cover 13, a vacuum interlayer 4 is formed between the outer wall of the gas cylinder liner 1 and the inner wall of the gas cylinder shell 2, the distribution head 3 is of a columnar structure, a gas cylinder valve pipeline component 5 is assembled at the upper end of the distribution head 3, and the middle peripheral ring of the distribution head 3 is welded with the upper ends of the first liner sealing cover 12 and the first outer shell sealing cover 22, the lower end of the distribution head 3 is inserted into the first liner sealing cover 12;
the manufacturing method of the gas cylinder sequentially comprises the following steps:
rolling the inner container plate, and rolling the steel plate into an inner container barrel body 11 according to a specified size by using a plate rolling machine;
welding the liner, namely welding a connecting longitudinal seam on a rolled liner cylinder body 11 by using an automatic welding machine, then sequentially welding a first liner sealing cover 12 formed by stamping to the top end of the liner cylinder body 11 in a ring welding manner, and welding a second liner sealing cover 13 formed by stamping to the bottom end of the liner cylinder body 11 in a ring welding manner to obtain a gas cylinder liner 1, and then performing nondestructive flaw detection on the seam by using a ray detector;
the distribution head is welded, namely the distribution head 3 is inserted into the first liner sealing cover 12, then the middle outer circumference of the distribution head 3 is welded with the opening of the first liner sealing cover 12, and a ray detector is adopted to carry out nondestructive inspection on a welding seam;
testing pressure, adopting a pressure testing tool to test the pressure bearing capacity of the gas cylinder liner 1, and detecting whether a welding seam has leakage;
rolling the shell into a plate, and rolling the steel plate into a shell cylinder 21 according to a specified size by adopting a plate rolling machine;
welding the shell, namely welding a second shell sealing cover 23 which is subjected to stamping forming to the bottom end of the shell cylinder 21 in a surrounding manner, then welding a first shell sealing cover 22 which is subjected to stamping forming to the top end of the shell cylinder 21 in a surrounding manner, and welding an opening of the first shell sealing cover 22 and the middle outer periphery of the distribution head 3 to form a vacuum interlayer 4 between the outer wall of the gas cylinder liner 1 and the inner wall of the gas cylinder shell 2;
helium leak detection and vacuumizing, namely placing a gas cylinder in a helium environment, measuring the leak rate of the vacuum interlayer 4 by using a leak detector, and vacuumizing the vacuum interlayer 4;
polishing, namely polishing the outer surface of the gas cylinder by using a polishing machine;
assembling the valve pipeline component, connecting the gas cylinder valve pipeline component 5 with the distribution head 3, and then carrying out an airtight test on the gas cylinder.
A fixed block 41 is arranged in the vacuum interlayer 4, the top end of the fixed block 41 is welded with the outer wall of the bottom end of the second liner sealing cover 13, and the bottom end of the fixed block 41 is welded with the inner wall of the bottom end of the second outer shell sealing cover 23;
in the step of welding the inner container, after the inner container 1 of the gas cylinder is obtained, the top end of the fixed block 41 is welded with the outer wall of the bottom end of the second inner container sealing cover 13;
in the shell welding step, before the first shell cover 22 and the shell cylinder 21 are welded, the bottom end of the fixing block 41 is welded with the inner wall of the bottom end of the second shell cover 23.
In the step of rolling the inner container plate and the outer shell plate, the misalignment amount of the joint after rolling is not more than +/-0.1 Sn, wherein Sn is the thickness of a steel plate.
In the step of welding the inner container, the gas storage amount of an automatic welding machine is not lower than 10bar, arc leading and extinguishing plates are adopted to ensure smooth transition of welding seams, the edge angle of the welding seams is not more than +/-0.1 Sn +2mm during longitudinal seam welding, the misalignment amount of the connecting parts is not more than +/-0.1 Sn, the rest height of the welding seams is 0-2.5mm, the width of the welding seams is not more than 3mm, the welding current and the welding voltage are respectively 180 plus and minus 210A and 24-26V during circumferential welding, the edge angle of the welding seams is not more than +/-0.1 Sn +2mm, the misalignment amount of the connecting parts is not more than +/-0.25 Sn, the rest height of the welding seams is 0-2.5mm, and the width of the welding;
in the shell welding step, the axial height of the part of the distribution head 3, which is positioned outside the gas cylinder shell 2, is 36-38mm, the gas storage amount of an automatic welding machine is not lower than 10bar, and an arc leading and extinguishing plate is adopted to ensure smooth transition of a welding seam, during longitudinal seam welding, the edge angle of the welding seam is not more than +/-0.1 Sn +2mm, the edge misalignment amount of a joint is not more than +/-0.1 Sn, the residual height of the welding seam is 0-1.5mm, the width of the welding seam is not more than 3mm, during circumferential welding, the welding current and the welding voltage are respectively 180 DEG and 210A and 24-26V, the edge angle of the welding seam is not more than +/-0.1 Sn +2mm, the edge misalignment amount of the joint is not more than 0.25Sn, the residual height of the welding seam is 0-;
wherein Sn is the thickness of the steel plate.
In the pressure testing step, the method for testing the pressure bearing capacity comprises the following steps: gradually increasing the pressure to 3.18MPa in the gas cylinder liner 1, maintaining the pressure for 4-6min, and judging to be qualified if the gas cylinder liner 1 is not abnormal in the process.
In the helium leakage detection and vacuum pumping steps, the leakage rate needs to be less than 10-9Pa·m3S, degree of vacuumLess than or equal to 10-2Pa。
In the polishing step, a 180# nylon polishing belt is adopted by the polishing machine.
In the step of assembling the valve pipeline assembly, the valve pipeline assembly comprises a valve, an air supply pipeline and a safety valve, and the air tightness test is as follows:
gradually increasing the pressure inside the gas cylinder to 1.59MPa, maintaining the pressure for 2-4min, and checking whether bubbles emerge at the positions of a valve, a gas supply pipeline and a welding line of the gas cylinder by using soapy water in the process.
The technical characteristics of the gas cylinder manufactured by the method are shown in the following table:
TABLE 1 technical characteristics of the cylinders
Example 1:
a method for manufacturing a 200L liquefied natural gas low-temperature and low-pressure gas cylinder for an automobile,
referring to fig. 1, the gas cylinder comprises a gas cylinder liner 1, a gas cylinder shell 2 and a distribution head 3 which are coaxially arranged, the gas cylinder liner 1 is composed of a liner cylinder 11 which is hollow and cylindrical inside, a first liner sealing cover 12 positioned at the top end of the liner cylinder 11 and a second liner sealing cover 13 positioned at the bottom end of the liner cylinder 11, the gas cylinder shell 2 is composed of a shell cylinder 21 which is sleeved outside the liner cylinder 11, a first outer shell sealing cover 22 which is sleeved outside the first liner sealing cover 12 and a second outer shell sealing cover 23 which is sleeved outside the second liner sealing cover 13, a vacuum interlayer 4 is formed between the outer wall of the gas cylinder liner 1 and the inner wall of the gas cylinder shell 2, a fixed block 41 is arranged in the vacuum interlayer 4, the top end of the fixed block 41 is welded with the outer wall at the bottom end of the second liner sealing cover 13, the bottom end of the fixed block 41 is welded with the inner wall at the bottom end of the second outer, the distribution head 3 is of a columnar structure, the upper end of the distribution head 3 is provided with a gas cylinder valve pipeline component 5, the middle outer periphery of the distribution head 3 is welded with the upper ends of the first liner sealing cover 12 and the first outer shell sealing cover 22, and the lower end of the distribution head 3 is inserted into the first liner sealing cover 12;
the manufacturing method of the gas cylinder is sequentially carried out according to the following steps:
rolling the inner container plate, and rolling a steel plate into an inner container barrel body 11 according to a specified size by using a plate rolling machine, wherein the misalignment amount at the joint of the rolled inner container barrel body 11 is not more than +/-0.1 Sn, wherein Sn is the thickness of the steel plate;
welding the inner container by using an automatic welding machine, firstly welding a connecting longitudinal seam on a rolled and formed inner container barrel 11, then sequentially welding a first inner container sealing cover 12 formed by stamping to the top end of the inner container barrel 11 and welding a second inner container sealing cover 13 formed by stamping to the bottom end of the inner container barrel 11 to obtain the gas cylinder inner container 1, then welding the top end of a fixed block 41 and the outer wall of the bottom end of the second inner container sealing cover 13, and finally performing nondestructive inspection on each welding position by using a ray detector, wherein the gas storage capacity of the automatic bar welding machine is not less than 10, and a leading and arc extinguishing plate is adopted to ensure smooth transition of a welding seam, when the longitudinal seam is welded, the edge angle of the welding seam is not more than +/-0.1 Sn +2mm, the unfitness of the connecting position is not more than +/-0.1 Sn, the surplus height of the welding seam is 0-2.5mm, the width of the welding seam is not more than 3mm, and when the circumferential welding is performed, the welding current, 24-26V, the edge angle of the welding seam is not more than +/-0.1 Sn +2mm, the misalignment amount at the joint is not more than +/-0.25 Sn, the residual height of the welding seam is 0-2.5mm, and the width of the welding seam is not more than 3 mm;
the distribution head is welded, namely the distribution head 3 is inserted into the first liner sealing cover 12, then the middle outer circumference of the distribution head 3 is welded with the opening of the first liner sealing cover 12, and a ray detector is adopted to carry out nondestructive inspection on a welding seam;
pressure testing, adopt the pressure testing frock to inspect the bearing capacity of gas cylinder inner bag 1 to whether detect the welding seam and leak, wherein, the inspection method of bearing capacity is: gradually increasing the pressure inside the gas cylinder liner 1 to 3.18MPa, maintaining the pressure for 4-6min, and judging to be qualified if the gas cylinder liner 1 is not abnormal in the process;
rolling the shell into a plate, rolling a steel plate into a shell cylinder 21 according to a specified size by using a plate rolling machine, wherein the misalignment amount at the joint of the shell cylinder 21 after rolling is not more than +/-0.1 Sn;
welding the shell, firstly welding a second shell sealing cover 23 which is formed by stamping to the bottom end of a shell cylinder 21 in an encircling way, welding the bottom end of a fixed block 41 to the inner wall of the bottom end of the second shell sealing cover 23, then welding a first shell sealing cover 22 which is formed by stamping to the top end of the shell cylinder 21 in an encircling way, welding the opening of the first shell sealing cover 22 to the outer periphery of the middle part of a distribution head 3, and forming a vacuum interlayer 4 between the outer wall of a gas cylinder liner 1 and the inner wall of a gas cylinder shell 2, wherein the axial height of the part of the distribution head 3 which is positioned outside the gas cylinder shell 2 is 36-38mm, the gas storage amount of an automatic welding machine is not lower than 10bar, and a leading and arc extinguishing plate is adopted to ensure smooth transition of a welding seam, the edge angle of the welding seam is not more than +/-0.1 Sn +2mm, the unfixed amount of the connecting part is not more than +/-0.1 Sn, the residual height of the welding seam is 0, during girth welding, the welding current and the welding voltage are respectively 180-210A and 24-26V, the edge angle of a welding line is not more than +/-0.1 Sn +2mm, the misalignment amount of a connecting part is not more than 0.25Sn, the extra height of the welding line is 0-2.5mm, and the width of the welding line is not more than 3 mm;
helium leak detection and vacuumizing are carried out by placing a gas cylinder in a helium environment, measuring the leak rate of a vacuum interlayer 4 by using a leak detector, wherein the leak rate is required to be less than 10-9Pa·m3S, vacuum degree less than or equal to 10-2Pa, then vacuumizing the vacuum interlayer 4;
polishing, namely polishing the outer surface of the gas cylinder by adopting a polishing machine taking 180# nylon as a polishing belt;
assemble valve pipeline subassembly, be connected gas cylinder valve pipeline subassembly 5 and distributor head 3 earlier, then carry out airtight test to the gas cylinder, wherein, valve pipeline subassembly includes valve, air supply line, relief valve, and airtight test is:
gradually increasing the pressure inside the gas cylinder to 1.59MPa, maintaining the pressure for 2-4min, and checking whether bubbles emerge at the positions of a valve, a gas supply pipeline and a welding line of the gas cylinder by using soapy water in the process.
Claims (8)
1. A method for manufacturing a 200L liquefied natural gas low-temperature low-pressure gas cylinder for an automobile is characterized by comprising the following steps of:
the gas cylinder comprises a gas cylinder liner (1), a gas cylinder shell (2) and a distribution head (3) which are coaxially arranged, wherein the gas cylinder liner (1) consists of a cylindrical liner cylinder body (11) which is hollow inside, a first liner sealing cover (12) which is positioned at the top end of the liner cylinder body (11) and a second liner sealing cover (13) which is positioned at the bottom end of the liner cylinder body (11), the gas cylinder shell (2) consists of a shell cylinder body (21) which is sleeved outside the liner cylinder body (11), a first outer shell sealing cover (22) which is sleeved outside the first liner sealing cover (12) and a second outer shell sealing cover (23) which is sleeved outside the second liner sealing cover (13), a vacuum interlayer (4) is formed between the outer wall of the gas cylinder liner (1) and the inner wall of the gas cylinder shell (2), the distribution head (3) is of a columnar structure, and a gas cylinder valve pipeline assembly (5) is assembled at the upper end of the distribution head (3), the middle outer circumference of the distribution head (3) is welded with the upper ends of the first liner sealing cover (12) and the first outer shell sealing cover (22), and the lower end of the distribution head (3) is inserted into the first liner sealing cover (12);
the manufacturing method of the gas cylinder sequentially comprises the following steps:
rolling the inner container into a plate, and rolling the steel plate into an inner container barrel (11) according to a specified size by adopting a plate rolling machine;
welding the inner container, namely welding a connecting longitudinal seam on a rolled and formed inner container barrel (11) by using an automatic welding machine, then sequentially welding a first inner container sealing cover (12) formed by stamping to the top end of the inner container barrel (11) in a circular mode, and welding a second inner container sealing cover (13) formed by stamping to the bottom end of the inner container barrel (11) in a circular mode to obtain the gas cylinder inner container (1), and then performing nondestructive flaw detection on the seam by using a ray detector;
welding the distribution head, namely inserting the distribution head (3) into the first liner sealing cover (12), then welding the middle peripheral ring of the distribution head (3) with the opening of the first liner sealing cover (12), and performing nondestructive flaw detection on a welding line by adopting a ray detector;
pressure testing, namely testing the pressure bearing capacity of the gas cylinder liner (1) by adopting a pressure testing tool, and detecting whether a welding seam leaks;
rolling the shell into a plate, and rolling the steel plate into a shell cylinder (21) according to a specified size by adopting a plate rolling machine;
welding a shell, namely welding a second stamped shell sealing cover (23) to the bottom end of a shell cylinder (21) in a surrounding manner, then welding a first stamped shell sealing cover (22) to the top end of the shell cylinder (21) in a surrounding manner, and welding an opening of the first shell sealing cover (22) to the middle outer periphery of a distribution head (3) to form a vacuum interlayer (4) between the outer wall of a gas cylinder liner (1) and the inner wall of a gas cylinder shell (2);
helium leak detection and vacuumizing, namely placing a gas cylinder in a helium environment, measuring the leak rate of the vacuum interlayer (4) by using a leak detector, and vacuumizing the vacuum interlayer (4);
polishing, namely polishing the outer surface of the gas cylinder by using a polishing machine;
assembling a valve pipeline component, connecting a gas cylinder valve pipeline component (5) with a distribution head (3), and then carrying out an airtight test on the gas cylinder.
2. The method for manufacturing the 200L liquefied natural gas low-temperature and low-pressure gas cylinder for the automobile according to claim 1, is characterized in that:
a fixed block (41) is arranged in the vacuum interlayer (4), the top end of the fixed block (41) is welded with the outer wall of the bottom end of the second liner sealing cover (13), and the bottom end of the fixed block (41) is welded with the inner wall of the bottom end of the second outer shell sealing cover (23);
in the step of welding the inner container, after the inner container (1) of the gas cylinder is obtained, the top end of a fixed block (41) is welded with the outer wall of the bottom end of a second inner container sealing cover (13);
in the shell welding step, the bottom end of the fixing block (41) is welded with the inner wall of the bottom end of the second shell sealing cover (23) before the first shell sealing cover (22) and the shell cylinder (21) are welded.
3. The method for manufacturing the 200L liquefied natural gas low-temperature and low-pressure gas cylinder for the automobile according to claim 1 or 2, characterized in that: in the step of rolling the inner container plate and the outer shell plate, the misalignment amount of the joint after rolling is not more than +/-0.1 Sn, wherein Sn is the thickness of a steel plate.
4. The method for manufacturing the 200L liquefied natural gas low-temperature and low-pressure gas cylinder for the automobile according to claim 1 or 2, characterized in that:
in the step of welding the inner container, the gas storage amount of an automatic welding machine is not lower than 10bar, arc leading and extinguishing plates are adopted to ensure smooth transition of welding seams, the edge angle of the welding seams is not more than +/-0.1 Sn +2mm during longitudinal seam welding, the misalignment amount of the connecting parts is not more than +/-0.1 Sn, the rest height of the welding seams is 0-2.5mm, the width of the welding seams is not more than 3mm, the welding current and the welding voltage are respectively 180 plus and minus 210A and 24-26V during circumferential welding, the edge angle of the welding seams is not more than +/-0.1 Sn +2mm, the misalignment amount of the connecting parts is not more than +/-0.25 Sn, the rest height of the welding seams is 0-2.5mm, and the width of the welding;
in the shell welding step, the axial height of the part of the distribution head (3) outside the gas cylinder shell (2) is 36-38mm, the gas storage capacity of an automatic welding machine is not lower than 10bar, and an arc leading and extinguishing plate is adopted to ensure smooth transition of a welding seam, the edge angle of the welding seam is not more than +/-0.1 Sn +2mm during longitudinal seam welding, the misalignment amount of a joint is not more than +/-0.1 Sn, the rest height of the welding seam is 0-1.5mm, the width of the welding seam is not more than 3mm, the welding current and the welding voltage are respectively 180-class 210A and 24-26V during circumferential welding, the edge angle of the welding seam is not more than +/-0.1 Sn +2mm, the misalignment amount of the joint is not more than 0.25Sn, the rest height of the welding seam is 0-2.5mm, and the width of;
wherein Sn is the thickness of the steel plate.
5. The method for manufacturing the 200L liquefied natural gas low-temperature and low-pressure gas cylinder for the automobile according to claim 1 or 2, characterized in that: in the pressure testing step, the method for testing the pressure bearing capacity comprises the following steps: gradually increasing the pressure to 3.18MPa in the gas cylinder liner (1), then maintaining the pressure for 4-6min, and judging to be qualified if the gas cylinder liner (1) is not abnormal in the process.
6. The method for manufacturing the 200L liquefied natural gas low-temperature and low-pressure gas cylinder for the automobile according to claim 1 or 2, characterized in that: in the helium leakage detection and vacuumizing steps, the leakage rate needs to be reducedIs less than 10-9Pa · m under vacuum degree of less than or equal to 10- 2Pa。
7. The method for manufacturing the 200L liquefied natural gas low-temperature and low-pressure gas cylinder for the automobile according to claim 1 or 2, characterized in that: in the polishing step, a 180# nylon polishing belt is adopted by the polishing machine.
8. The method for manufacturing the 200L liquefied natural gas low-temperature and low-pressure gas cylinder for the automobile according to claim 1 or 2, characterized in that:
in the step of assembling the valve pipeline assembly, the valve pipeline assembly comprises a valve, an air supply pipeline and a safety valve, and the air tightness test is as follows:
gradually increasing the pressure inside the gas cylinder to 1.59MPa, maintaining the pressure for 2-4min, and checking whether bubbles emerge at the positions of a valve, a gas supply pipeline and a welding line of the gas cylinder by using soapy water in the process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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