Pipe welding device with cooling function

Abstract

This invention discloses a pipe welding device with cooling function, belonging to the technical field of welding equipment. It includes an annular welding mechanism for positioning the pipe body and the pipe fitting body. A cooling circulation mechanism is provided inside the weld formed by the pipe body and the pipe fitting body, comprising two inner lining blocks connected by threads, forming an annular cooling zone together with the inner side of the weld. A negative pressure heat exchange mechanism is also provided in the inner lining block. This invention solves the problem of poor heat dissipation on the inner wall of small-diameter pipes, enabling gradient cooling of the weld and heat-affected zone, suppressing pipe deformation, improving welding quality, and allowing for closed-loop recycling of the protective gas, significantly reducing material costs and achieving anti-oxidation protection of the weld.

Description

Technical Field

[0001] This invention belongs to the technical field of welding equipment, and more specifically relates to a pipe welding device with a cooling function. Background Technology

[0002] Plasma welding equipment is a precision welding device that uses a compressed plasma arc as a heat source. It mainly consists of a welding power source, welding torch, gas path, cooling and control system. It achieves efficient welding of workpieces by compressing the electric arc to form a high-energy-density plasma arc. It features a small heat-affected zone, small deformation, beautiful weld formation, and stable welding quality. It is suitable for precision welding of various metal materials such as stainless steel, titanium alloy, and carbon steel.

[0003] In the welding process of small-diameter pipes and fittings, plasma arc welding is usually used for precision welding operations. This type of fusion welding process has concentrated heat input and high energy density. However, the pipe wall of small-diameter pipes is thin and the overall heat capacity is small. Welding heat is very easy to accumulate rapidly in the weld and surrounding area, which can lead to a series of quality defects such as hot deformation of fittings, overheating oxidation of weld, and excessive residual stress in welding. Therefore, existing welding processes generally use welding shielding gas directly as the cooling medium, achieving cooling and heat dissipation by continuously blowing airflow into the weld and heat-affected zone. The aim is to reduce the temperature of the welding area through gas convection heat transfer and alleviate the adverse effects of heat accumulation. However, this air-cooling method relying on shielding gas has extremely low heat exchange efficiency and limited cooling capacity. It cannot quickly dissipate the concentrated heat continuously generated during the welding process, resulting in poor real-time temperature control of the weld and heat-affected zone. In addition, the internal space of small-diameter pipes is narrow and the heat dissipation capacity is poor. The welding heat on the inner wall of the pipe can only be slowly conducted and diffused through the pipe wall, and cannot be efficiently and timely dissipated. Therefore, small-diameter pipes are prone to problems such as radial elliptical deformation, weld burn-through, or coarse grains during the welding process, reducing the pass rate. Moreover, in order to achieve a basic air-cooling effect, a large flow of shielding gas needs to be continuously consumed. However, the cost of commonly used welding shielding gases such as argon is high, which seriously reduces the economic efficiency of production. Summary of the Invention

[0004] This invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution. Belonging to the technical field of welding equipment, this invention primarily offers a pipe welding device with a cooling function. This addresses the technical problem mentioned in the background section: the current air-cooling method used for welding small-diameter pipes consumes a large amount of protective gas, has low cooling efficiency, and makes it difficult to dissipate heat from the inner wall of the pipe. The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: The utility model provides a pipe welding device with cooling function, including annular welding mechanism for positioning pipe body and pipe body, the inside of weld formed by pipe body and pipe body is provided with cooling circulation mechanism, cooling circulation mechanism includes two inner lining piece, two inner lining piece is divided into first inner lining piece and second inner lining piece, first inner lining piece outer wall is close -fitted with pipe body inner wall, second inner lining piece outer wall is close -fitted with pipe body inner wall, and two inner lining piece is connected through screw thread between two inner lining piece, and with the inside of weld forms annular cooling area together, the outer wall of inner lining piece is provided with first slow flow groove, second slow flow groove and third slow flow groove along the axial equidistance, a plurality of first backflow holes are provided with around the groove wall of third slow flow groove equidistance, a plurality of air inlet hole and second backflow hole are provided with around the front end of inner lining piece equidistance, cooling cavity and negative pressure cavity are provided in the inner lining piece, cooling cavity communicates with first backflow hole, negative pressure cavity communicates with second backflow hole, negative pressure heat exchange mechanism is further provided in the inner lining piece, and negative pressure heat exchange mechanism includes the heat exchange water tank of inside hollow, a plurality of heat exchange channels are provided with around the heat exchange water tank equidistance, and each heat exchange channel is provided with spiral flow guide plate, and heat exchange channel, second backflow hole, annular cooling area, first slow flow groove, second slow flow groove and third slow flow groove and first backflow hole together constitute the backflow channel for the circulation cooling of protective gas.

[0005] Preferably, the cross-sectional dimensions of the first, second and third slow flow grooves gradually decrease, and a plurality of openings for gas flow are provided around the groove walls of the first, second and third slow flow grooves equidistantly, and the openings on adjacent groove walls are not in the same plane.

[0006] Preferably, the heat exchange water tank is located in a heat exchange cavity, a plurality of through holes are provided on the side wall of the heat exchange cavity equidistantly, and the through holes correspond one-to-one to the heat exchange channels on the heat exchange water tank, and the through holes communicate with the negative pressure cavity.

[0007] Preferably, a sealing plate is connected to the negative pressure cavity by bolts.

[0008] Preferably, the negative pressure heat exchange mechanism further comprises a double-shaft motor, the double-shaft motor is located between the two sealing plates, hollow shafts and rotating shafts are respectively provided on the two output ends of the double-shaft motor, the front ends of the hollow shafts and the rotating shafts penetrate through the corresponding circular holes on the sealing plates, and negative pressure blades are provided on the front ends of the hollow shafts and the rotating shafts, the negative pressure blades rotate in the corresponding negative pressure cavities.

[0009] Preferably, a gas injection pipe is provided on the heat exchange water tank in the first inner lining piece, one end of the gas injection pipe is connected to the hollow shaft, a shaft seal is provided at the connection between the hollow shaft and the gas injection pipe, and a plurality of gas outlet holes are provided around the end of the hollow shaft close to the double-shaft motor equidistantly.

[0010] Preferably, the two hot water exchange tanks are provided with two conveying pipes for water injection and drainage, and each conveying pipe is provided with two joints, which are connected to the interfaces on the hot water exchange tank.

[0011] Preferably, the first inner liner block and the second inner liner block are respectively connected to the first end cap and the second end cap by bolts. The grooves on the outer walls of the first end cap and the second end cap are provided with sealing rings, and the air injection pipe and the delivery pipe pass through the round hole on the first end cap.

[0012] Preferably, the annular welding mechanism includes a base, a support portion on the base, an arc-shaped mounting portion on the support portion, an annular track within the arc-shaped mounting portion, a gear disk rotatably connected to the annular track, and a bearing disposed in the gap between the gear disk and the annular track. The gear disk is bolted to a mounting plate, and the mounting plate is connected to a welding structure with lifting function via a bracket. The welding structure is located on the weld. The support portion is bolted to a servo motor, and a drive gear is disposed at the output end of the servo motor. The drive gear meshes with the gear disk. A support frame is bolted to the side wall of the support portion, and the support frame is connected to one side of the outer wall of the first end cover.

[0013] Preferably, the base is provided with a pipe clamp positioning component with bolts, and the front end of the bolt in the pipe clamp positioning component abuts against the outer wall of the pipe body.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention, through the base, annular track, gear disk, mounting disk, welding structure, pipe clamp positioning component, servo motor, drive gear, first inner liner block, second inner liner block, first end cover, second end cover and sealing plate, realizes the construction of a dedicated annular cooling zone on the inside of the weld, so that the low temperature protective gas can directly reach the weld inner wall area where the welding heat is most concentrated, and directly and efficiently heats the weld in the narrow closed space. It solves the problem that the internal space is narrow and the welding heat of the inner wall is difficult to conduct outward when welding small diameter pipes and fittings. It effectively suppresses the defects such as radial elliptical deformation, displacement, weld burn-through and coarse grains caused by continuous overheating of the inner wall of the fittings, and greatly improves the forming accuracy and joint mechanical properties of small diameter pipe welding. The interaction between the first, second, and third slow-flow channels adapts to the temperature field distribution of the welding area, enabling gradient heat dissipation. The low-temperature protective gas preferentially exchanges heat with the weld seam, which has the highest temperature, to achieve core heat exchange and cooling. It then flows through the first, second, and third slow-flow channels, whose cross-sectional dimensions decrease progressively, corresponding to the heat-affected zone, where the heat exchange temperature gradually decreases. This achieves a one-to-one match between heat exchange intensity and zone temperature. At the same time, the protective gas forms a cyclone within the slow-flow channels, extending the heat exchange residence time and creating a stable cooling ring on the inside of the weld seam and the entire heat-affected zone. This ensures sufficient dissipation of welding heat, effectively reduces residual welding stress, and further guarantees the long-term stability of welding quality.

[0015] (2) The present invention constructs a closed-loop circulating cooling system for protective gas by driving negative pressure blades with a dual-axis motor. Compared with the wind cooling method of continuously blowing protective gas directly into the welding area in the prior art, the protective gas can be recycled and reused throughout the entire process, effectively avoiding the ineffective emission of protective gas, improving the utilization rate of protective gas, significantly reducing the consumption of high-priced protective gases such as argon, and significantly compressing the cost of consumables in welding production. Meanwhile, during the circulation process, continuous heat exchange is achieved between the heat exchange channel with the external hot water tank through the spiral guide plate. This allows for stable and efficient cooling of the protective gas that has completed heat absorption and heating, ensuring that the protective gas entering the annular cooling zone is always at a stable low temperature. This makes the cooling effect continuously controllable throughout the welding process. In addition, the circulating protective gas can continuously and completely cover the inner wall of the weld throughout the welding process. While completing the cooling and heat dissipation, it also simultaneously achieves anti-oxidation protection for the inner wall of the high-temperature weld, thus addressing the dual core requirements of improving welding quality and controlling production costs.

[0016] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the positional relationship between the pipe body, the fitting body, and the cooling circulation mechanism of the present invention. Figure 3 This is a schematic diagram showing the connection between the cooling circulation mechanism and the support frame of the present invention; Figure 4 This is an exploded view of the cooling circulation mechanism of the present invention; Figure 5 This is a schematic diagram of the first inner liner block structure of the present invention; Figure 6 This is a schematic cross-sectional view of the first inner liner block of the present invention; Figure 7 This is a schematic diagram of the second inner liner block structure of the present invention; Figure 8 This is a schematic cross-sectional view of the second inner liner block of the present invention; Figure 9 This is a schematic diagram of the dual-axis motor connection of the present invention; Figure 10 This is a schematic cross-sectional view of the hollow shaft of the present invention; Figure 11 This is a schematic diagram showing the connection between the hot water tank and the delivery pipeline of the present invention; Figure 12 This is a schematic diagram of the hot water tank and spiral guide plate of the present invention; Figure 13 This is a schematic diagram of the first and second end cap structures of the present invention; Figure 14 This is a schematic diagram of the conveying pipeline structure of the present invention; Figure 15 This is a schematic diagram of the protective gas circulation flow plane of the present invention; Figure 16 This is a schematic diagram of the ring welding mechanism of the present invention; Figure 17 This is an exploded view of the ring welding mechanism of the present invention.

[0018] In the diagram: 1. Annular welding mechanism; 11. Base; 111. Support; 112. Arc-shaped mounting part; 13. Annular track; 14. Gear disk; 15. Mounting disk; 16. Welding structure; 17. Pipe clamp positioning component; 18. Servo motor; 19. Drive gear; 2. Pipe body; 3. Pipe fitting body; 4. Cooling circulation mechanism; 41. First inner liner block; 42. Second inner liner block; 43. First end cap; 431. Sealing ring; 44. Second end cap; 45. Sealing plate; 46. Annular cooling zone; 47. First flow retardation groove; 47 1. Second slow-flow channel; 472. Third slow-flow channel; 473. First return hole; 474. Opening; 475. Air inlet; 476. Second return hole; 48. Cooling chamber; 481. Through hole; 49. Negative pressure chamber; 5. Negative pressure heat exchange mechanism; 51. Dual-shaft motor; 52. Hollow shaft; 521. Air outlet; 53. Rotating shaft; 54. Negative pressure blades; 55. Air injection pipe; 551. Shaft seal; 56. Hot water tank; 561. Heat exchange channel; 57. Spiral guide plate; 58. Conveying pipe; 581. Connector; 6. Support frame. Detailed Implementation

[0019] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0022] For the implementation examples, please refer to the appendix. Figures 1-17 As shown, a pipe fitting welding device with a cooling function includes an annular welding mechanism 1 for positioning a pipe body 2 and a pipe fitting body 3. A cooling circulation mechanism 4 is provided on the inner side of the weld formed by the pipe body 2 and the pipe fitting body 3. The cooling circulation mechanism 4 includes two inner lining blocks, which are divided into a first inner lining block 41 and a second inner lining block 42. The outer wall of the first inner lining block 41 is in close contact with the inner wall of the pipe fitting body 3, and the outer wall of the second inner lining block 42 is in close contact with the inner wall of the pipe body 2. The two inner lining blocks are connected by threads and together with the inner side of the weld, form an annular cooling zone 46. The outer wall of the inner lining blocks is provided with a first flow-retarding groove 47, a second flow-retarding groove 471, and a third flow-retarding groove 472 at equal intervals along the axial direction. A plurality of first return holes 47 are provided at equal intervals around the groove wall of the third flow-retarding groove 472. 3. The front end of the liner block is provided with multiple air inlets 475 and second return holes 476 at equal intervals. The liner block is provided with a cooling chamber 48 and a negative pressure chamber 49. The cooling chamber 48 is connected to the first return hole 473, and the negative pressure chamber 49 is connected to the second return hole 476. The liner block is also provided with a negative pressure heat exchange mechanism 5. The negative pressure heat exchange mechanism 5 includes a hollow heat exchange tank 56. Multiple heat exchange channels 561 are provided at equal intervals on the heat exchange tank 56. Each heat exchange channel 561 is provided with a spiral guide plate 57. The heat exchange channel 561, the second return hole 476, the annular cooling zone 46, the first slow flow groove 47, the second slow flow groove 471, the third slow flow groove 472, and the first return hole 473 together constitute a return channel for protecting the gas circulation cooling.

[0023] The specific operation is as follows: First, the pipe body 3 is fitted onto the first inner liner block 41 of the cooling circulation mechanism 4. Then, the pipe body 2 is placed on the pipe clamp positioning piece 17, so that the pipe body 2 and the pipe body 3 are connected (at this time, one end of the pipe body 2 is fitted onto the second inner liner block 42). Then, the bolts on the pipe clamp positioning piece 17 are tightened to position the pipe body 2. Then, low-temperature protective gas is injected into the inner liner block through the gas injection pipe 55. The protective gas enters the hollow shaft 52 from the gas injection pipe 55. Then, it is discharged from the vent 521 and then enters the annular cooling zone 46 (formed by the inner side of the weld, the front end of the first inner liner block 41, and the front end of the second inner liner block 42) through the inlet 475. Subsequently, it fills the first slow flow groove 47, the second slow flow groove 471, the third slow flow groove 472, the second return hole 476, the interior of the first end cover 43 (the second end cover 44), the heat exchange channel 561, the negative pressure chamber 49, and the second return hole 476 in sequence (a small amount of protective gas leakage at the weld joint can be ignored). Open the welding structure 16 so that the welding head 581 in the welding structure 16 is aligned with the connection between the pipe body 2 and the fitting body. The servo motor 18 is started and drives the gear disk 14 to rotate through the drive gear 19. Subsequently, the mounting disk 15 on the gear disk 14 drives the welding structure 16 to perform circumferential welding at the connection and generate a large amount of heat. The dual-shaft motor 51 starts, driving the rotating shaft 53 and hollow shaft 52 to rotate. Consequently, the negative pressure blades 54 on the rotating shaft 53 and hollow shaft 52 rotate rapidly, generating negative pressure within the negative pressure chamber 49. This causes the protective gas to circulate along the negative pressure chamber 49, the second return hole 476, the annular cooling zone 46, the first slow-flow groove 47, the second slow-flow groove 471, the third slow-flow groove 472, the first return hole 473, and the heat exchange channel 561 (as shown in the attached diagram). Figure 15 As shown), the low-temperature protective gas first exchanges heat with the weld (the highest temperature point), reducing the temperature of the weld. Then, as it passes through the first slow-flow groove 47, the second slow-flow groove 471, and the third slow-flow groove 472, it can exchange heat with the heat-affected zone (the area with lower heat) around the weld. The heat-affected zone gets lower as it gets farther away from the weld, satisfying the requirement that the heat exchange intensity of the protective gas in the first slow-flow groove 47, the second slow-flow groove 471, and the third slow-flow groove 472 (the cross-sectional dimensions of the first slow-flow groove 47, the second slow-flow groove 471, and the third slow-flow groove 472 gradually decrease) is gradually reduced. This corresponds one-to-one and heats the gas step by step. At the same time, the protective gas is affected by the positional relationship between the slow-flow groove and the opening 474, which causes the formation of a cyclone in each slow-flow groove when it passes through the slow-flow groove, increasing the residence time and further improving the heat exchange effect on the heat-affected zone. As the protective gas passes through the heat exchange channel 561, the spiral guide plate 57 increases the flow path of the protective gas within the heat exchange channel 561, so that the cold water in the heat exchange tank 56 can better absorb the heat from the protective gas. After being cooled, the protective gas will return to the annular cooling zone 46 through the second return hole 476, and then repeat the cycle to achieve the recycling of the protective gas.

[0024] Please refer to the appendix carefully. Figures 4-8 As shown, the cross-sectional dimensions of the first slow-flow groove 47, the second slow-flow groove 471, and the third slow-flow groove 472 gradually decrease. Multiple openings 474 for gas flow are evenly spaced around the walls of the first slow-flow groove 47, the second slow-flow groove 471, and the third slow-flow groove 472, and the openings 474 on adjacent walls are not in the same plane. Through the structural design of the slow-flow grooves and openings 474, a cyclone is easily formed within the slow-flow groove during the process of protecting gas flow, so that the gas can fully absorb the heat from the heat-affected zone. The heat exchange tank 56 is located inside the heat exchange cavity. Multiple through holes 481 are evenly spaced on the side wall of the heat exchange cavity, and the through holes 481 correspond one-to-one with the heat exchange channels 561 on the heat exchange tank 56. The through holes 481 communicate with the negative pressure cavity 49. A sealing plate 45 is bolted to the negative pressure cavity 49, thus sealing one side of the negative pressure cavity 49.

[0025] Please refer to the appendix carefully. Figures 9-14As shown, the negative pressure heat exchange mechanism 5 also includes a dual-axis motor 51, which is located between two sealing plates 45. The two output ends of the dual-axis motor 51 are respectively provided with a hollow shaft 52 and a rotating shaft 53. The front ends of both the hollow shaft 52 and the rotating shaft 53 pass through circular holes on the corresponding sealing plates 45, and negative pressure blades 54 are provided at their front ends. The negative pressure blades 54 rotate within the corresponding negative pressure chamber 49. Through the cooperation between the dual-axis motor 51, the rotating shaft 53, the hollow shaft 52, and the negative pressure blades 54, a negative pressure is formed within the negative pressure chamber 49. To provide driving force for the circulation of protective gas, the heat exchange tank 56 in the first liner block 41 is equipped with an injection pipe 55. A one-way valve can be installed inside the injection pipe 55 to ensure that the protective gas flows unidirectionally into the annular cooling zone 46. One end of the injection pipe 55 is connected to the hollow shaft 52, and a shaft seal 551 is provided at the connection between the hollow shaft 52 and the injection pipe 55. The hollow shaft 52, near the end of the dual-axis motor 51, has multiple air outlets 521 arranged at equal intervals around it. Through the air outlets 521, the hollow shaft 52 is able to circulate... The protective gas inside is discharged. Two water exchange tanks 56 are jointly provided with two conveying pipes 58 for water injection and drainage. Each conveying pipe 58 is provided with two connectors 581, and the connectors 581 are connected to the interfaces on the water exchange tanks 56. The two conveying pipes 58 do not interfere with the rotating negative pressure blades 54. The two conveying pipes 58 can be connected to a common external circulating cooling device (existing equipment, therefore not shown in the figure). Low-temperature cold water is injected into the two water exchange tanks 56 from one conveying pipe 58, and then discharged from the other... A conveying pipe 58 leads out the water that has absorbed heat, and cools it down through an external circulating cooling device to ensure that the water in the hot water tank 56 remains at a low temperature. The first inner liner block 41 and the second inner liner block 42 are respectively connected to the first end cap 43 and the second end cap 44 by bolts. The grooves on the outer walls of the first end cap 43 and the second end cap 44 are provided with sealing rings 431. The air injection pipe 55 and the conveying pipe 58 both pass through the round hole on the first end cap 43. Through the sealing rings 431, the leakage of protective gas from the gaps is reduced.

[0026] Please refer to the appendix carefully. Figure 1 Appendix Figure 16 and attached Figure 17As shown, the annular welding mechanism 1 includes a base 11, a support portion 111 on the base 11, an arc-shaped mounting portion 112 on the support portion 111, an annular track 13 inside the arc-shaped mounting portion 112, a gear disk 14 rotatably connected to the annular track 13, and a bearing provided in the gap between the gear disk 14 and the annular track 13. The gear disk 14 is bolted to a mounting plate 15, and the mounting plate 15 is connected to a welding structure 16 with lifting function via a bracket. The welding structure 16 is located on the weld. The support portion 111 is bolted to a servo motor. The servo motor 18 has a drive gear 19 at its output end, which meshes with the gear disk 14. The side wall of the support part 111 is connected to a support frame 6 by bolts. The support frame 6 is connected to one side of the outer wall of the first end cover 43. Through the servo motor 18, the annular track 13, the gear disk 14, the drive gear 19, and the mounting plate 15, the welded structure 16 is driven to perform circumferential motion. The base 11 is provided with a pipe clamp positioning component 17 with bolts, and the front end of the bolt in the pipe clamp positioning component 17 abuts against the outer wall of the pipe body 2 to achieve positioning of the pipe body 2.

[0027] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A pipe fitting welding device with cooling function, comprising an annular welding mechanism (1) for positioning a pipe body (2) and a pipe fitting body (3), wherein a cooling circulation mechanism (4) is provided on the inner side of the weld formed by the pipe body (2) and the pipe fitting body (3), characterized in that, The cooling circulation mechanism (4) includes two inner liner blocks, which are divided into a first inner liner block (41) and a second inner liner block (42). The two inner liner blocks are connected by threads and together with the inner side of the weld seam to form an annular cooling zone (46). The outer wall of the inner liner block is provided with a first slow flow groove (47), a second slow flow groove (471) and a third slow flow groove (472) equidistantly along the axial direction. The third slow flow groove (472) has multiple first return holes (473) equidistantly arranged around its wall. The front end of the inner liner block has multiple air inlets (475) and second return holes (476) equidistantly arranged around its front end. The inner liner block is provided with a cooling chamber (48) and a negative pressure chamber (49). The cooling chamber (48) The negative pressure chamber (49) is connected to the first return hole (473), and the negative pressure chamber (49) is connected to the second return hole (476). The inner liner block is also provided with a negative pressure heat exchange mechanism (5). The negative pressure heat exchange mechanism (5) includes a hollow heat exchange tank (56). Multiple heat exchange channels (561) are arranged around the heat exchange tank (56) at equal intervals. Each heat exchange channel (561) is provided with a spiral guide plate (57). The heat exchange channel (561), the second return hole (476), the annular cooling zone (46), the first slow flow groove (47), the second slow flow groove (471), the third slow flow groove (472), and the first return hole (473) together constitute a return channel for protecting the gas circulation cooling.

2. The pipe fitting welding device with cooling function according to claim 1, characterized in that, The cross-sectional dimensions of the first slow flow channel (47), the second slow flow channel (471) and the third slow flow channel (472) gradually decrease. The first slow flow channel (47), the second slow flow channel (471) and the third slow flow channel (472) are provided with multiple openings (474) for gas flow at equal intervals around the channel walls, and the openings (474) on adjacent channel walls are not in the same plane.

3. The pipe fitting welding device with cooling function according to claim 1, characterized in that, The hot water tank (56) is located inside the heat exchange chamber. Multiple through holes (481) are provided at equal intervals on the side wall of the heat exchange chamber. The through holes (481) correspond one-to-one with the heat exchange channels (561) on the hot water tank (56). The through holes (481) are connected to the negative pressure chamber (49).

4. The pipe fitting welding device with cooling function according to claim 3, characterized in that, A sealing plate (45) is bolted to the negative pressure chamber (49).

5. A pipe fitting welding device with cooling function according to claim 1, characterized in that, The negative pressure heat exchange mechanism (5) also includes a dual-axis motor (51), which is located between two sealing plates (45). The two output ends of the dual-axis motor (51) are respectively provided with a hollow shaft (52) and a rotating shaft (53). The front ends of the hollow shaft (52) and the rotating shaft (53) pass through the round holes on the corresponding sealing plates (45) and are provided with negative pressure blades (54) at the front ends. The negative pressure blades (54) rotate in the corresponding negative pressure chamber (49).

6. A pipe fitting welding device with cooling function according to claim 1, characterized in that, The first inner lining block (41) has an air injection pipe (55) installed on the hot water tank (56). One end of the air injection pipe (55) is connected to the hollow shaft (52). A shaft seal (551) is installed at the connection between the hollow shaft (52) and the air injection pipe (55). Multiple air outlets (521) are arranged at equal intervals around the end of the hollow shaft (52) near the dual-shaft motor (51).

7. A pipe fitting welding device with cooling function according to claim 6, characterized in that, The two hot water tanks (56) are provided with two conveying pipes (58) for water injection and drainage. Each conveying pipe (58) is provided with two connectors (581), and the connectors (581) are connected to the interface on the hot water tank (56).

8. A pipe fitting welding device with cooling function according to claim 6, characterized in that, The first inner liner block (41) and the second inner liner block (42) are respectively connected to the first end cap (43) and the second end cap (44) by bolts. The first end cap (43) and the second end cap (44) are provided with sealing rings (431) in the grooves on the outer walls of the first end cap (43) and the second end cap (44), and the air injection pipe (55) and the delivery pipe (58) pass through the round hole on the first end cap (43).

9. A pipe fitting welding device with cooling function according to claim 1, characterized in that, The annular welding mechanism (1) includes a base (11), a support part (111) is provided on the base (11), an arc-shaped mounting part (112) is provided on the support part (111), an annular track (13) is provided inside the arc-shaped mounting part (112), a gear disk (14) is rotatably connected to the annular track (13), and a bearing is provided in the gap between the gear disk (14) and the annular track (13). The gear disk (14) is connected to a mounting disk (15) by bolts. The mounting disk (15) is connected to a welding structure (16) with lifting function by a bracket. The welding structure (16) is located on the weld. The support part (111) is connected to a servo motor (18) by bolts. A drive gear (19) is provided at the output end of the servo motor (18). The drive gear (19) meshes with the gear disk (14). A support frame (6) is connected to the side wall of the support part (111) by bolts. The support frame (6) is connected to one side of the outer wall of the first end cover (43).

10. A pipe fitting welding device with cooling function according to claim 9, characterized in that, The base (11) is provided with a pipe clamp positioning component (17) with bolts, and the front end of the bolt in the pipe clamp positioning component (17) abuts against the outer wall of the pipe body (2).

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