CN114198646B

CN114198646B - 3D prints gas transmission pipeline of protection gas device with taking leak protection structure certainly

Info

Publication number: CN114198646B
Application number: CN202111580144.5A
Authority: CN
Inventors: 王林; 马桂殿; 冯文强
Original assignee: Nanjing Chenglian Laser Technology Co Ltd
Current assignee: Nanjing Chenglian Laser Technology Co Ltd
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2023-06-16
Anticipated expiration: 2041-12-22
Also published as: CN114198646A

Abstract

The invention provides a gas pipeline with a leakage-proof structure for a 3D printing protection gas device, which belongs to the technical field of gas pipelines for 3D printer protection gas devices and comprises a steel pipe, wherein one end of the steel pipe is welded with a first connector, the other end of the steel pipe is welded with a second connector, the first connector and the second connector are locked by a connecting piece, a sealing ring I is arranged in an edge groove of the second connector, and a liquid sealing structure, a sealing structure I, a sealing structure II and an inner sealing structure are sequentially arranged between the first connector and the second connector from inside to outside. The invention solves the problems that the connection of the steel pipes in the protective gas device in the prior art generally adopts the way of splicing or locking nut connection, the traditional connection way still can generate the phenomenon of gas leakage, and the complete sealing of the connection part can not be ensured.

Description

3D prints gas transmission pipeline of protection gas device with taking leak protection structure certainly

Technical Field

The invention belongs to the technical field of gas pipelines for protective gas devices for 3D printers, and particularly relates to a gas pipeline with a leakage-proof structure for a 3D printing protective gas device.

Background

A 3D printing, namely a rapid prototyping technology, also called additive manufacturing, is a technology for constructing objects by using powdery metal or plastic and other bondable materials in a layer-by-layer printing mode based on digital model files. 3D printing is usually implemented by using a digital material printer, and is often used to manufacture models in the fields of mold manufacturing, industrial design, etc., and then gradually used for direct manufacturing of some products, and parts printed by using this technology are already available. The shielding gas system is an important component of SLM molding in the 3D printing technology, and the shielding gas device serving as the shielding gas system comprises a gas cylinder, an argon pressure reducing valve, a steel pipe and the like.

In the prior art, the steel pipes in the protective gas device are generally connected in a plugging or locking mode, and the phenomenon of gas leakage still possibly occurs after the traditional connection mode is connected, so that the complete sealing of the connection part cannot be ensured.

Disclosure of Invention

The invention provides a gas transmission pipeline with a leakage-proof structure for a 3D printing protection gas device, and aims to solve the problems that in the prior art, steel pipes in the protection gas device are connected in a plugging or locking female connection mode, the traditional connection mode still possibly generates gas leakage phenomenon, and the connection position cannot be completely sealed.

The embodiment of the invention provides a gas transmission pipeline with a leak-proof structure for a 3D printing protection gas device, which comprises a steel pipe, wherein a first connector is welded at one end of the steel pipe, a second connector is welded at the other end of the steel pipe, the first connector and the second connector are locked by a connecting piece, a first sealing ring is arranged in an edge groove of the second connector, and a liquid sealing structure, a first sealing structure, a second sealing structure and an inner sealing structure are sequentially arranged between the first connector and the second connector from inside to outside;

the liquid seal structure comprises a first seal channel, a second seal channel, an oil tank, a connecting channel, an oil inlet pipe, a valve I and a liquid level display structure, wherein the first seal channel is arranged on the outer peripheral surface of the first connector, the second seal channel is arranged on the inner peripheral surface of the second connector, the first seal channel and the second seal channel form a seal channel, the oil tank is fixed on the outer peripheral surface of the first connector, the oil tank is made of transparent plastic materials, liquid is filled in the oil tank, the oil tank and the seal channel are mutually communicated through the connecting channel, the middle part of the side of the oil tank is communicated with the oil inlet pipe, the valve I is arranged on the oil inlet pipe, and the liquid level display structure is arranged in the oil tank;

the liquid level display structure comprises a floating plate, a second sealing ring, a rubber sleeve ring, a movable column and a marking line, wherein the floating plate is arranged in the oil tank, the floating plate is positioned on the liquid level of liquid in the oil tank, the second sealing ring is fixedly connected to the side of the floating plate and is attached to the inner wall surface of the oil tank, the rubber sleeve ring is arranged at the mouth part of the upper end of the oil tank, the movable column is arranged at the upper end surface of the floating plate, the movable top end of the movable column penetrates through the rubber sleeve ring, the movable column is in sliding connection with the rubber sleeve ring, and the marking line is arranged on the surface of the middle part of the movable column;

the first sealing structure comprises first sealing grooves and annular sealing blocks, the first sealing grooves are formed in the inner wall surface of the first connector, the first sealing grooves are two, the annular sealing blocks are fixed on the inner wall surface of the second connector, the two annular sealing blocks are arranged, and the first annular sealing blocks are mutually matched with the first sealing grooves;

the sealing structure II comprises an expansion tank I, an expansion tank II, an expansion air bag, an air inlet pipe and a valve II, wherein the expansion tank I is arranged on the inner wall surface of the connector I, the expansion tank II is arranged on the inner wall surface of the connector II, the expansion tank I and the expansion tank II form an expansion tank, the expansion air bag is arranged in the expansion tank, the air inlet pipe is connected to the side of the expansion air bag, and one end of the air inlet pipe, which is far away from the expansion air bag, extends to the outer side of the connector I and is fixedly connected with the valve II;

the inner sealing structure comprises a second sealing groove, a third sealing groove and a third sealing ring, wherein the second sealing groove is formed in the inner wall surface of the first connector, the third sealing groove is formed in the inner wall surface of the second connector, the second sealing groove and the third sealing groove form a sealing groove, and the third sealing ring is clamped in the sealing groove.

By adopting the technical scheme, the joint of the first connector and the second connector on the steel pipe is sealed by the inner sealing structure, the sealing performance of the joint of the first connector and the second connector on the steel pipe is enhanced by adopting the air bag expansion mode through the addition of the sealing structure II, the sealing performance of the joint of the first connector and the second connector on the steel pipe can be enhanced again by utilizing the sealing structure I, the sealing performance of the joint of the first connector and the second connector on the steel pipe is enhanced for the third time by adopting the liquid sealing mode, the complete sealing of the joint of the gas transmission pipeline is realized, and meanwhile, whether the gas leakage exists at the joint can be judged by utilizing the change of the liquid level in the gas transmission pipeline, so that the gas transmission pipeline joint is convenient for a worker to check; the oil inlet pipe injects liquid into the oil tank, the floating plate changes along with the change of the liquid level, the liquid not only can seal the joint, but also can be used for displaying the change of the liquid level, and whether the joint leaks air or not is judged through the change of the liquid level in the oil tank, so that the joint can be conveniently checked by staff; the floating of the floating plate lifts with the movable column, and the change of the liquid level in the oil tank can be clearly observed through the change of the marking line position on the surface of the movable column, so that whether air leakage occurs at the joint can be further known; the annular sealing block is clamped in the first sealing groove, so that the sealing performance of the joint of the first connector and the second connector on the steel pipe is enhanced; the inflatable air bag is inflated through the air inlet pipe, so that the inflatable air bag is inflated, the inflatable air bag is completely filled with the first inflation groove and the second inflation groove, when the air leakage occurs at the joint, the inflatable air bag is compressed towards the outer side by the protection gas, the inflatable air bag is tightly attached to the joint, and the sealing performance of the joint is enhanced by the inflatable air bag; and the third sealing ring is clamped in the second sealing groove and the third sealing groove to realize the initial sealing of the joint of the steel pipes.

Further, the edge of the first connector is concave towards the second connector, the second connector is clamped in the first connector, and the surface of the first sealing ring at the edge of the second connector is attached to the inner peripheral surface of the second connector.

Through adopting above-mentioned technical scheme, be convenient for the installation of connector one and connector two through connector two block in the inside of connector one, can guarantee to connect one and the edge of connector two junction simultaneously and hug closely through sealing washer one, prevent the liquid in the liquid seal structure from flowing out, ensure the normal of liquid seal structure function.

Further, the connecting piece is annular evenly distributed, the connecting piece includes lead screw, annular silk mouth pipe and inclined rod, and the lead screw is fixed on the internal face of connector one, the through-hole silk that one end of lead screw passed connector two has connected annular silk mouth pipe, mirror image fixedly connected with a pair of inclined rod on the limit wall of annular silk mouth pipe.

Through adopting above-mentioned technical scheme, drive annular silk mouth pipe through rotatory dead lever and rotate for in the lead screw stretched into annular silk mouth pipe, annular silk mouth pipe compresses tightly connector two in connector one, and then realizes the quick locking of connector one and connector two.

The beneficial effects of the invention are as follows:

1. according to the invention, the joint of the first connector and the second connector on the steel pipe is sealed by utilizing the inner sealing structure, meanwhile, the expansion air bag is inflated through the air inlet pipe by additionally arranging the sealing structure, so that the expansion air bag is expanded, the expansion air bag is completely filled with the expansion groove I and the expansion groove II, when the joint leaks air, the expansion air bag is compressed towards the outer side, the joint is tightly attached to the expansion air bag, the sealing performance of the joint is enhanced by utilizing the expansion air bag, the sealing performance of the joint of the first connector and the second connector on the steel pipe is enhanced again by utilizing the sealing structure I, the liquid is injected into the oil tank by utilizing the oil inlet pipe on the liquid sealing structure, the marking line on the surface of the movable column on the floating plate is changed along with the change of the liquid level, the liquid can be used for sealing the joint, the change of the liquid level can be displayed, and whether the joint leaks air or not can be judged by the change of the liquid level in the oil tank, so that a worker can check the joint of the gas transmission pipeline is realized, and the complete sealing of the joint of the gas transmission pipeline is realized.

2. According to the invention, through the arrangement of the connecting piece, the inclined rod on the connecting piece is rotated to drive the annular screw port pipe to rotate, so that the screw rod extends into the annular screw port pipe, the annular screw port pipe tightly presses the connector II in the connector I, the quick locking of the connector I and the connector II is realized, and the disassembly and assembly of the joint of the steel pipes are facilitated.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:

FIG. 1 is a schematic perspective view of an embodiment of the present invention;

FIG. 2 is a schematic diagram of a main sectional structure of an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of the structure of FIG. 2 according to the embodiment of the present invention;

FIG. 4 is an enlarged schematic view of the structure of FIG. 2 according to the embodiment of the present invention;

FIG. 5 is an enlarged schematic view of the structure of FIG. 2 according to an embodiment of the present invention;

reference numerals: 1. a steel pipe; 2. a first connector; 3. a second connector; 4. a connecting piece; 5. a first sealing ring; 6. a liquid seal structure; 7. a first sealing structure; 8. a second sealing structure; 9. an inner sealing structure; 41. a screw rod; 42. an annular wire mouth tube; 43. a diagonal rod; 61. sealing the first channel; 62. sealing the second channel; 63. an oil tank; 64. a connection channel; 65. an oil inlet pipe; 66. a valve I; 67. a liquid level display structure; 671. a floating plate; 672. a second sealing ring; 673. a rubber collar; 674. a movable column; 675. marking lines; 71. a first seal groove; 72. an annular sealing block; 81. an expansion tank I; 82. an expansion tank II; 83. inflating the balloon; 84. an air inlet pipe; 85. a second valve; 91. sealing grooves II; 92. sealing grooves III; 93. and a sealing ring III.

Detailed Description

In order to make the objects, technical solutions and advantages of the technical solutions of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments of the present invention. Like reference numerals in the drawings denote like parts. It should be noted that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.

Referring to fig. 1 and 2, an embodiment of the invention provides a gas pipeline with a leak-proof structure for a 3D printing protection gas device, which comprises a steel pipe 1, one end of the steel pipe 1 is welded with a first connector 2, the other end of the steel pipe 1 is welded with a second connector 3, the first connector 2 and the second connector 3 are locked by a connecting piece 4, the connecting piece 4 is uniformly distributed in an annular shape, the connecting piece 4 comprises a lead screw 41, an annular wire pipe 42 and an inclined rod 43, the lead screw 41 is fixed on the inner wall surface of the first connector 2, one end of the lead screw 41 penetrates through a through hole of the second connector 3 and is connected with the annular wire pipe 42, a pair of inclined rods 43 are connected onto the side wall of the annular wire pipe 42 in a mirror image and fixedly manner, the annular wire pipe 42 is driven to rotate by rotating the inclined rod 43, so that the lead screw 41 stretches into the annular wire pipe 42, the annular wire pipe 42 compresses the first connector 3 in the first connector 2, further realizing rapid locking of the first connector 2 and the second connector 3, a sealing ring 5 is arranged in an edge groove of the second connector 3, the edge of the first connector 2 is inwards concave towards the second connector 3, the first connector 3 is clamped on the inner surface of the second connector 3 and the second connector 3 is clamped on the inner surface of the first connector 3 and the second connector 3 is guaranteed to be tightly connected with the first connector 3 and the second connector 3 through the sealing ring 6.

Referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, a liquid seal structure 6, a first seal structure 7, a second seal structure 8 and an inner seal structure 9 are sequentially arranged between the first connector 2 and the second connector 3 from inside to outside, the liquid seal structure 6 comprises a first seal channel 61, a second seal channel 62, an oil tank 63, a connecting channel 64, an oil inlet pipe 65, a valve one 66 and a liquid level display structure 67, the first seal channel 61 is arranged on the outer peripheral surface of the first connector 2, the second seal channel 62 is arranged on the inner peripheral surface of the second connector 3, the first seal channel 61 and the second seal channel 62 form a seal channel, the oil tank 63 is fixed on the outer peripheral surface of the first connector 2, the oil tank 63 is made of transparent plastic material, the oil tank 63 is filled with liquid, the oil tank 63 is communicated with the seal channel through the connecting channel 64, the middle part of the side of the oil tank 63 is communicated with the oil inlet pipe 65, the valve one 66 is arranged on the oil inlet pipe 65, the oil tank 63 is internally provided with a liquid level display structure 67, the oil inlet pipe 65 injects liquid into the oil tank 63, the floating plate 671 changes along with the change of the liquid level, the liquid not only can seal the joint, but also can be used for displaying the change of the liquid level, whether the joint leaks air or not is judged through the change of the liquid level in the oil tank 63, so that the joint is conveniently checked by staff, the liquid level display structure 67 comprises the floating plate 671, a second sealing ring 672, a rubber sleeve 673, a movable column 674 and a marking line 675, the floating plate 671 is arranged in the oil tank 63, the floating plate 671 is positioned on the liquid level of the liquid in the oil tank 63, the second sealing ring 672 is fixedly connected with the side of the floating plate 671, the second sealing ring 672 is attached to the inner wall surface of the oil tank 63, the mouth part of the upper end of the oil tank 63 is provided with the rubber sleeve 673, the upper end surface of the movable column 674 is arranged, and the movable top end of the movable column 674 passes through the rubber sleeve 673, the movable column 674 is in sliding connection with the rubber collar 673, the marking line 675 is arranged on the surface of the middle part of the movable column 674, the floating of the floating plate 671 drives the movable column 674 to lift, the liquid level change in the oil tank 63 can be clearly observed through the change of the position of the marking line 675 on the surface of the movable column 674, and then whether the gas leakage occurs at the joint is known, the sealing structure I7 comprises a sealing groove I71 and an annular sealing block 72, the sealing groove I71 is arranged on the inner wall surface of the connector I2, the sealing groove I71 is provided with two, the annular sealing block 72 is fixed on the inner wall surface of the connector II 3, the annular sealing block 72 is provided with two, the annular sealing block 72 is mutually matched with the sealing groove I71, the sealing property of the joint of the connector I2 and the connector II 3 on the steel pipe 1 is enhanced, the sealing structure II 8 comprises an expansion groove I81, an expansion air bag 83, an air inlet pipe 84 and a valve II 85, the first expansion tank 81 is arranged on the inner wall surface of the first connector 2, the second expansion tank 82 is arranged on the inner wall surface of the second connector 3, the first expansion tank 81 and the second expansion tank 82 form an expansion tank, an expansion air bag 83 is arranged in the expansion tank, an air inlet pipe 84 is connected to the side of the expansion air bag 83, one end of the air inlet pipe 84, far away from the expansion air bag 83, extends to the outer side of the first connector 2, a valve II 85 is fixedly connected to the outer side of the first connector 2, the expansion air bag 83 is inflated through the air inlet pipe 84, so that the expansion air bag 83 is inflated, the expansion air bag 83 is completely filled with the first expansion tank 81 and the second expansion tank 82, when the joint leaks air, the protection gas can enable the expansion air bag 83 to compress towards the outer side, the joint is further enabled to be attached tightly, the joint tightness is enhanced by the expansion air bag 83, the inner sealing structure 9 comprises a sealing groove II 91, the third sealing groove 92 and the third sealing ring 93, the second sealing groove 91 is arranged on the inner wall surface of the first connector 2, the third sealing groove 92 is arranged on the inner wall surface of the second connector 3, the second sealing groove 91 and the third sealing groove 92 form a sealing groove, the third sealing ring 93 is clamped in the sealing groove, and the third sealing ring 93 is clamped in the second sealing groove 91 and the third sealing groove 92 to realize initial sealing of the joint of the steel pipe 1.

The implementation mode specifically comprises the following steps: when in use, the third sealing ring 93 is sleeved in the second sealing groove 91, the screw rod 41 on the first connector 2 is aligned with the through hole on the second connector 3, the second connector 3 extends into the first connector 2, the screw rod 41 penetrates through the through hole, the rotary inclined rod 43 drives the annular screw port pipe 42 to rotate, the screw rod 41 extends into the annular screw port pipe 42, the annular screw port pipe 42 compresses the second connector 3 in the first connector 2, further the quick locking of the first connector 2 and the second connector 3 is realized, the third sealing ring 93 is tightly attached to the second sealing groove 91 and the third sealing groove 92, the annular sealing block 72 is correspondingly clamped in the first sealing groove 71, the initial sealing of the joint of the steel pipe 1 is realized through the third sealing ring 93, the sealing property of the joint of the steel pipe 1 is enhanced by the annular sealing block 72 and the first sealing groove 71, the second valve 85 is opened, the expansion air bag 83 is inflated through the air inlet pipe 84, and the expansion air bag 83 is inflated, the expansion air bag 83 completely fills the expansion groove I81 and the expansion groove II 82, the sealing performance of the joint of the steel pipe 1 is enhanced again by utilizing the expansion air bag 83, the movable column 674 is pulled up, the lower part of the marking line 675 on the surface of the movable column 674 is overlapped with the upper surface of the rubber sleeve 673, the valve I66 is opened, the oil inlet pipe 65 is used for injecting liquid into the oil tank 63, the liquid can be the liquid which is not easy to volatilize, the liquid is stopped when the liquid is injected to be overlapped with the lower surface of the floating plate 671, when the joint of the steel pipe 1 leaks air, the protective gas flows out from the gaps of the sealing groove II 91, the sealing groove III 92 and the sealing ring III 93 and enters the expansion groove I81 and the expansion groove II 82, the protective gas enables the expansion air bag 83 to be compressed towards the outer side, the joint of the expansion air bag 83 is more tightly attached, the sealing performance of the joint is enhanced by utilizing the expansion air bag 83, when the protective gas leaks too much, the protective gas extrudes the expansion air bag 83 and enters the first sealing groove 71, when the protective gas breaks through the first sealing groove 71 and the annular sealing block 72 and enters the first sealing channel 61 and the second sealing channel 62, the protective gas can enable the liquid level in the oil tank 63 to rise or fall, the floating of the floating plate 671 lifts with the movable column 674, the change of the liquid level in the oil tank 63 can be clearly observed through the change of the position of the marking line 675 on the surface of the movable column 674, and a patrol worker can accurately judge the air leakage of the joint of the steel pipe 1 through the position of the marking line 675, so that the gas transmission pipeline can be maintained timely.

The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a 3D prints gas transmission pipeline of protection gas device with taking leak protection structure, includes steel pipe (1), its characterized in that, one end welding of steel pipe (1) has connector one (2), the other end welding of steel pipe (1) has connector two (3), connector one (2) and connector two (3) pass through connecting piece (4) locking, be provided with sealing washer one (5) in the edge groove of connector two (3), from inside to outside has set gradually liquid seal structure (6), seal structure one (7), seal structure two (8) and interior seal structure (9) between connector one (2) and the connector two (3);

the liquid seal structure (6) comprises a first seal channel (61), a second seal channel (62), an oil tank (63), a connecting channel (64), an oil inlet pipe (65), a first valve (66) and a liquid level display structure (67), wherein the first seal channel (61) is arranged on the outer peripheral surface of the first connector (2), the second seal channel (62) is arranged on the inner peripheral surface of the second connector (3), the first seal channel (61) and the second seal channel (62) form a seal channel, the oil tank (63) is fixed on the outer peripheral surface of the first connector (2), the oil tank (63) is made of transparent plastic materials, liquid is filled in the oil tank (63), the oil tank (63) is communicated with the seal channel through the connecting channel (64), the middle part of the side of the oil tank (63) is communicated with the oil inlet pipe (65), the first valve (66) is arranged on the oil inlet pipe (65), and the liquid level display structure (67) is arranged in the oil tank (63).

The liquid level display structure (67) comprises a floating plate (671), a second sealing ring (672), a rubber sleeve ring (673), a movable column (674) and a marking line (675), wherein the floating plate (671) is arranged in the oil tank (63), the floating plate (671) is positioned on the liquid level of liquid in the oil tank (63), the second sealing ring (672) is fixedly connected with the side of the floating plate (671), the second sealing ring (672) is attached to the inner wall surface of the oil tank (63), the rubber sleeve ring (673) is arranged at the mouth part of the upper end of the oil tank (63), the movable column (674) is arranged at the upper end surface of the floating plate (671), the movable top end of the movable column (674) penetrates through the rubber sleeve ring (673), the movable column (674) is in sliding connection with the rubber sleeve ring (673), and the marking line (675) is arranged on the surface of the middle part of the movable column (674).

The first sealing structure (7) comprises a first sealing groove (71) and annular sealing blocks (72), the first sealing groove (71) is arranged on the inner wall surface of the first connector (2), two sealing grooves are arranged on the first sealing groove (71), the annular sealing blocks (72) are fixed on the inner wall surface of the second connector (3), two annular sealing blocks (72) are arranged, and the annular sealing blocks (72) and the first sealing groove (71) are mutually matched;

the sealing structure II (8) comprises an expansion tank I (81), an expansion tank II (82), an expansion air bag (83), an air inlet pipe (84) and a valve II (85), wherein the expansion tank I (81) is arranged on the inner wall surface of the connector I (2), the expansion tank II (82) is arranged on the inner wall surface of the connector II (3), the expansion tank I (81) and the expansion tank II (82) form an expansion tank, the expansion air bag (83) is arranged in the expansion tank, the air inlet pipe (84) is connected to the side of the expansion air bag (83), and one end, far away from the expansion air bag (83), of the air inlet pipe (84) extends to the outer side of the connector I (2) and is fixedly connected with the valve II (85);

the inner sealing structure (9) comprises a second sealing groove (91), a third sealing groove (92) and a third sealing ring (93), wherein the second sealing groove (91) is formed in the inner wall surface of the first connector (2), the third sealing groove (92) is formed in the inner wall surface of the second connector (3), the second sealing groove (91) and the third sealing groove (92) form a sealing groove, and the third sealing ring (93) is clamped in the sealing groove.

2. The gas pipeline with the leakage-proof structure for the 3D printing protection gas device according to claim 1, wherein the edge of the first connector (2) is concave towards the second connector (3), the second connector (3) is clamped in the first connector (2), and the surface of the first sealing ring (5) at the edge of the second connector (3) is attached to the inner peripheral surface of the second connector (3).

3. The gas pipeline with the leakage-proof structure for the 3D printing protection gas device according to claim 1, wherein the connecting pieces (4) are uniformly distributed in a ring shape, the connecting pieces (4) comprise a screw rod (41), a ring-shaped screw hole pipe (42) and inclined rods (43), the screw rod (41) is fixed on the inner wall surface of the first connector (2), one end of the screw rod (41) penetrates through a through hole of the second connector (3) to be connected with the ring-shaped screw hole pipe (42) in a threaded mode, and a pair of inclined rods (43) are fixedly connected to the side wall of the ring-shaped screw hole pipe (42) in a mirror image mode.