An argon-filled rectification device for argon arc welding

Abstract

The present invention provides an argon filling and rectifying device for argon arc welding, comprising: a rectifying main body, arranged at one end of a pipeline and at least partially inserted into the pipeline; a rectifying cavity is formed inside it, and a number of rectifying holes are arranged on the side of the rectifying cavity facing the inside of the pipeline; an air inlet interface, arranged on the side of the rectifying main body facing away from the inside of the pipeline and communicating with the rectifying cavity, for connecting an air inlet assembly that outputs argon; the argon gas in the rectifying cavity flows into the pipeline through the rectifying holes. By arranging the argon filling and rectifying device for argon arc welding connected to the air inlet assembly at the end of the pipeline, the present invention enables the argon gas to be dispersed through the rectifying holes at the end of the rectifying cavity and then enter the pipeline, which can avoid the accumulation of argon gas in some areas and make the argon gas evenly distributed in the pipeline. Thus, it can avoid the back of the weld from contacting with oxygen in the air due to high temperature and undergoing oxidation and carburization, improving the welding quality. At the same time, it can make the argon filling and rectifying device for argon arc welding applicable to bent pipelines, improving the applicability.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline welding, and particularly relates to an argon filling rectifying device for argon arc welding, which is mainly used for the argon filling process during the prefabrication of large-diameter and long pipelines in the field of high-clean pipeline system engineering. Background Art

[0002] The argon arc welding technology is based on the principle of ordinary arc welding. By using argon gas to protect the metal welding material, a high current is used to melt the welding material into a liquid state on the base material to be welded to form a molten pool, so that the base metal and the welding material achieve metallurgical bonding. During the high-temperature melting welding process, argon gas is continuously supplied to isolate the adverse effects of oxygen, nitrogen, hydrogen, etc. in the air on the arc and the molten pool, reduce the burning loss of alloying elements, and obtain a dense, spatter-free and high-quality welded joint. Argon arc welding can weld almost all metals, especially some refractory metals and easily oxidized metals, such as magnesium, titanium, molybdenum, zirconium, aluminum and their alloys.

[0003] When performing argon arc welding root pass on the pipeline weld, the front of the weld will be protected by the argon gas ejected from the welding torch, while the back of the weld will be oxidized and carburized due to contact with oxygen in the air at high temperature, reducing the corrosion resistance, high-temperature resistance, low-temperature resistance and other properties of the pipeline. Therefore, before pipeline welding, especially before welding stainless steel pipelines, it is necessary to use a special argon filling tool to perform argon filling protection inside the pipeline.

[0004] However, during the process of filling argon into the pipeline by the existing argon filling tools, it completely depends on the hose port connected to the argon gas cylinder. The argon filling process is slow, and the argon gas is concentrated at the hose port and diffuses to the outside, resulting in uneven distribution of argon gas inside the pipeline, which is prone to oxidation and carburization and affects the welding quality.

[0005] Therefore, designing an argon filling rectifying device for argon arc welding that can improve the uniformity of argon gas diffusion inside the pipeline to improve the welding quality has become a technical problem that needs to be solved urgently by those skilled in the art.

[0006] In view of this, the present invention is specifically proposed. Summary of the Invention

[0007] The present invention provides an argon filling rectifying device for argon arc welding, which is arranged at the end of the pipeline and connected to the intake assembly. The argon gas flowing into the pipeline from the intake assembly flows through the rectifying cavity and is dispersed through the rectifying holes at the end of the rectifying cavity and then enters the pipeline, which can avoid the aggregation of argon gas in some areas and make the argon gas evenly distributed inside the pipeline, solving the problem of poor welding quality caused by uneven distribution of argon gas inside the existing pipeline during the welding process.

[0008] To solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0009] An argon filling and rectifying device for argon arc welding, comprising:

[0010] A rectifying main body, arranged at one end of the pipeline and at least partially inserted into the pipeline; a rectifying cavity is formed inside it, and a number of rectifying holes are arranged on the side of the rectifying cavity facing the inside of the pipeline;

[0011] An air inlet interface, arranged on the side of the rectifying main body facing away from the inside of the pipeline and communicating with the rectifying cavity, for connecting an air inlet component that outputs argon; the argon in the rectifying cavity flows into the pipeline through the rectifying holes.

[0012] Further, the rectifying cavity includes at least two levels arranged in the direction towards the inside of the pipeline;

[0013] The rectifying holes include: a first rectifying hole for communicating adjacent two-level sub-rectifying cavities; and a second rectifying hole, arranged on the side of the rectifying main body facing the inside of the pipeline, for communicating with the inside of the pipeline.

[0014] Further, the rectifying cavity includes a first-level sub-rectifying cavity and a second-level sub-rectifying cavity arranged in sequence in the direction towards the inside of the pipeline; a first rectifying hole and a second rectifying hole are respectively arranged on the sides of the first-level sub-rectifying cavity and the second-level sub-rectifying cavity facing the inside of the pipeline;

[0015] The aperture of the first rectifying hole is smaller than that of the second rectifying hole.

[0016] Further, the rectifying holes are arranged at intervals along the circumferential direction of the pipeline and are provided with multiple circles arranged at intervals along the radial direction of the pipeline;

[0017] In the arrangement direction away from the axis of the pipeline, the aperture of the second rectifying holes on different circumferences gradually increases; and / or, in the arrangement direction away from the axis of the pipeline, the arrangement density of the second rectifying holes on different circumferences along the circumferential direction of the pipeline gradually increases.

[0018] Further, the apertures of all the first rectifying holes are the same and are smaller than the aperture of the second rectifying hole located on the innermost circumference; or,

[0019] In the arrangement direction away from the axis of the pipeline, the aperture of the first rectifying holes on different circumferences gradually increases, the aperture of the first rectifying hole located on the outermost circumference is smaller than the aperture of the second rectifying hole located on the innermost circumference, or the aperture of the first rectifying hole on the circumference at any distance from the axis of the pipeline is smaller than the aperture of the second rectifying hole on the rotating shaft at the same distance from the axis of the pipeline.

[0020] Further, it further includes an argon filling diffuser, which is arranged on the inner wall of the rectifying cavity on the side facing away from the inside of the pipeline and is in a cylindrical shape protruding from the inner wall of the rectifying cavity towards the inside of the rectifying cavity;

[0021] One end of the argon filling diffuser is arranged around the air inlet interface, the other end is closed, and a number of diffusion holes for communicating with the inside of the rectifying cavity are arranged on the circumferential side of the argon filling diffuser.

[0022] Furthermore, the rectifying body includes:

[0023] A secondary rectifying plate, which extends radially along the pipeline, has a diameter larger than the inner diameter of the pipeline and less than or equal to the outer diameter of the pipeline; a groove press is provided in the middle thereof and extends towards the inside of the pipeline. The outer diameter of the groove press is adapted to the inner diameter of the pipeline and is inserted at the end of the pipeline.

[0024] A housing, which includes a peripheral wall sleeved on the outer periphery of the end of the pipeline and an end wall opposite to the end of the pipeline;

[0025] A rectifying cavity is formed between the housing and the secondary rectifying plate. The air inlet interface is arranged at the center of the end wall of the housing, and a rectifying hole is arranged on the bottom of the groove of the groove press.

[0026] Furthermore, the rectifying body further includes a primary rectifying plate. The primary rectifying plate is arranged between the end wall of the housing and the bottom of the groove of the secondary rectifying plate. A primary sub-rectifying cavity is formed between the primary rectifying plate and the housing body, and a secondary sub-rectifying cavity is formed between the primary rectifying plate and the secondary rectifying plate; a first rectifying hole is arranged on the primary rectifying plate, and a second rectifying hole is arranged on the bottom of the groove of the groove press.

[0027] Furthermore, the diameter of the primary rectifying plate is the same as the inner diameter of the groove press of the secondary rectifying plate;

[0028] Limiting blocks protruding radially inwards are arranged on the groove wall of the groove press, and an annular limiting portion protruding towards the inside of the pipeline is arranged on the end wall of the housing. The primary rectifying plate is installed in the groove press of the secondary rectifying plate and is clamped between the annular limiting portion and the limiting blocks.

[0029] Furthermore, the groove press of the secondary rectifying plate includes an equal-diameter section extending in the direction towards the inside of the pipeline, and a variable-diameter section whose diameter gradually increases along the extending direction towards the inside of the pipeline from the end of the equal-diameter section;

[0030] The outer diameter of the end of the variable-diameter section far from the equal-diameter section is the same as the inner diameter of the pipeline; the diameter of the primary rectifying plate is the same as the inner diameter of the equal-diameter section, and the limiting blocks are arranged on the equal-diameter section of the groove press.

[0031] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0032] 1. By arranging a GTAW argon filling rectifying device connected to the air inlet assembly at the end of the pipeline, the present invention enables the argon gas supplied into the pipeline by the air inlet assembly to flow through the rectifying cavity, and after being dispersed by the rectifying holes at the end of the rectifying cavity, enters the pipeline. This can avoid the aggregation of argon gas in some areas, make the argon gas evenly distributed in the pipeline. Thus, it can avoid the oxidation and carburization of the back of the weld due to the contact of high temperature with oxygen in the air, improve the welding quality, and at the same time, enable the GTAW argon filling rectifying device to be applicable to bent pipelines, improving the applicability.

[0033] 2. By setting that the rectification cavity includes at least two - stage sub - rectification cavities arranged in the direction towards the inside of the pipeline, and setting that the aperture of the first rectification hole is smaller than that of the second rectification hole, during the process of argon gas flowing through the rectification cavity, the argon gas can be dispersed by the first rectification holes on multiple partition layers. When the argon gas flows towards the inside of the pipeline, it can be evenly diffused in the radial cross - section of the entire rectification cavity. When the argon gas flows into the pipeline through the second rectification holes on the end face of the rectification main body towards the inside of the pipeline, the second rectification holes with larger apertures can ensure the uniform flow of argon gas in the entire radial cross - section while reducing the gas flow resistance, making the flow state of the argon gas in a laminar, stable and uniform state, fully protecting the weld with argon gas and playing a role in saving argon gas.

[0034] 3. By setting the argon - filling diffuser, the argon gas entering through the air - inlet interface can diffuse into the first - stage sub - rectification cavity through the diffusion holes on the periphery of the argon - filling diffuser, which can enable the argon gas to be quickly and evenly distributed in the first - stage sub - rectification cavity. At the same time, combined with the flow resistance of the first - stage rectification plate with smaller - aperture first rectification holes, the gas distribution passing through the first - stage rectification plate is more uniform.

[0035] 4. By setting that the rectification holes are arranged at intervals along the circumferential direction of the pipeline, arranged in multiple circles at intervals along the radial direction of the pipeline, and setting that along the arrangement direction away from the pipeline axis, the apertures of the rectification holes on different circumferences gradually increase, the flow rate near the pipe wall in the pipeline is slightly larger than that at the center of the pipeline. Thus, it can give full play to the protective effect of argon gas on the weld, avoid weld oxidation, and at the same time can save the consumption of argon gas.

[0036] 5. By setting that the rectification main body includes a housing, a first - stage rectification plate and a second - stage rectification plate, it is convenient to install the rectification main body on the pipeline. At the same time, it can ensure the sealing effect at the end of the pipeline and prevent the argon gas in the pipeline from diffusing out from the end of the pipeline where the rectification main body is installed.

[0037] Meanwhile, the structure of the present invention is simple, the effect is remarkable, and it is suitable for popularization and use.

[0038] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. Description of the Drawings

[0039] The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the accompanying drawings in the following description are only some embodiments. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In the drawings:

[0040] Figure 1 It is the assembly drawing of the argon filling and rectifying device in the embodiment of the present invention;

[0041] Figure 2 It is the explosion schematic diagram of the argon filling and rectifying device in the embodiment of the present invention;

[0042] Figure 3 It is the structural schematic diagram of the primary rectifying plate in the embodiment of the present invention;

[0043] Figure 4 It is the structural schematic diagram of the secondary rectifying plate in the embodiment of the present invention;

[0044] Figure 5 It is the cross-sectional view of the secondary rectifying plate in the embodiment of the present invention;

[0045] Figure 6 It is the structural schematic diagram of the outer shell in the embodiment of the present invention;

[0046] Figure 7 It is the structural schematic diagram of the argon filling diffuser in the embodiment of the present invention.

[0047] Description of the main components in the figure:

[0048] 1. Outer shell; 11. Air inlet interface; 12. Annular limiting part; 2. Secondary rectifying plate; 21. Flanging; 22. Second rectifying hole; 23. Limiting block; 24. Equal-diameter section; 25. Reducing section; 3. Primary rectifying plate; 31. First rectifying hole; 4. Air inlet assembly; 5. Argon filling diffuser; 51. Diffusion hole.

[0049] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0050] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0051] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0052] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In an embodiment of the present invention, an argon-filled rectifying device for argon arc welding is introduced. The argon-filled rectifying device for argon arc welding is mainly used for the argon filling process during the welding of long pipelines. Specifically, the argon-filled rectifying device for argon arc welding is mainly used for the argon filling process during the welding of large-diameter long pipelines in the prefabrication stage of high-cleanliness pipeline system engineering fields.

[0054] During the welding process of a long pipeline, the front of the weld is protected by argon gas ejected from the welding torch, while the back of the weld will come into contact with oxygen in the air inside the pipeline due to high temperature, resulting in oxidation and carburization, reducing the corrosion resistance, high-temperature resistance, low-temperature resistance, etc. of the weld of the pipeline. Therefore, before welding a long pipeline, it is necessary to use a special argon-filling tool to fill argon into the pipeline to protect the back of the weld.

[0055] The "welding of a long pipeline" includes welding the weld on a single long pipeline or welding the weld between two butt-connected long pipelines.

[0056] Generally, the diameter of the output port of the argon-filling tool is smaller than the inner diameter of the pipeline, the argon-filling process is slow, and the argon gas is concentrated at the output port of the argon-filling tool, resulting in uneven distribution of argon gas inside the pipeline. In particular, during the process of argon gas flowing into the pipeline, the distribution of argon gas in the radial direction of the pipeline is uneven, resulting in an inability to achieve an ideal protection effect on the back of the weld and easy waste of argon gas.

[0057] For high-cleanliness system engineering fields, in order to meet the high-cleanliness requirements of GB50073 ISO5 level, the inner weld of the pipeline must reach a light yellow or even silver-white color to meet the above high-cleanliness requirements. However, there are almost no successful cases of pipeline system engineering with a diameter greater than or equal to 500 mm in China. The difficulty lies in finding a method to ensure that the purity and content of argon gas inside the large-diameter pipeline reach certain requirements so that the inner weld can reach a light yellow or even silver-white state. Therefore, in combination with the existing domestic argon-filling interfaces, an argon-filled rectifying device for argon arc welding has been specifically developed. After the argon protection gas passes through the device of the present invention, it can be evenly diffused to the inner surface of the large-diameter pipeline, especially ensuring the argon gas concentration at the weld, so that the inner weld reaches a light yellow or even silver-white state after welding, thus solving the problem of the cleanliness of the inner weld of the large-diameter pipeline.

[0058] Embodiment 1

[0059] As Figures 1 to 7 shown, the embodiment of the present invention introduces an argon filling and rectifying device for TIG welding, which is used to improve the uniformity of argon diffusion inside the pipeline, improve the protection effect of argon on the back of the weld of the pipeline, improve the welding quality, and at the same time, is beneficial to improving the utilization rate of argon and saving the consumption of argon.

[0060] Specifically, as Figure 1 shown, in this embodiment, the argon filling and rectifying device for TIG welding includes a rectifying main body, the rectifying main body is arranged at one end of the pipeline, at least part of the rectifying main body is inserted into the pipeline, a rectifying cavity is formed inside the rectifying main body, an air inlet interface 11 is arranged at the first end of the rectifying main body, and an air inlet assembly 4 is communicated with the rectifying cavity through the air inlet interface 11 for filling argon into the rectifying cavity. A plurality of rectifying holes are arranged at the second end of the rectifying main body, and the rectifying cavity is communicated with the inside of the pipeline through the rectifying holes.

[0061] The plurality of rectifying holes are dispersedly arranged on the side of the rectifying cavity facing the inside of the pipeline, so that the argon gas supplied into the pipeline by the air inlet assembly 4 flows through the rectifying cavity and enters the pipeline after being dispersed by the rectifying holes at the end of the rectifying cavity, which can avoid the aggregation of argon gas in some areas inside the pipeline and make the argon gas evenly distributed inside the pipeline. Thus, it can avoid the back of the weld from contacting with oxygen in the air at high temperature and undergoing oxidation and carburization, improving the welding quality.

[0062] Moreover, the argon filling and rectifying device for TIG welding in this embodiment is not only applicable to filling argon into a long straight pipeline, but also applicable to filling argon into a bent pipeline.

[0063] In this embodiment, the end of the rectifying main body inserted into the pipeline is the second end of the rectifying main body, that is, the end of the rectifying main body facing away from the inside of the pipeline is the first end of the rectifying main body, and the end of the rectifying main body facing the inside of the pipeline is the second end of the rectifying main body.

[0064] In some possible embodiments, there is one rectifying cavity, one end of the rectifying cavity is communicated with the air inlet assembly 4, the other end of the rectifying cavity is communicated with the inside of the pipeline through a plurality of rectifying holes, and the argon gas is blocked by the cavity wall at the end of the rectifying cavity close to the inside of the pipeline, so that the argon gas diffuses in the radial direction of the pipeline and then flows into the inside of the pipeline from the rectifying holes arranged at the end of the rectifying cavity, making the argon gas flow inward on the entire radial cross-section of the pipeline and improving the protection effect on the back of the weld on the pipeline.

[0065] In some other possible embodiments, the rectifying cavity includes at least two levels of sub-rectifying cavities arranged in the direction towards the inside of the pipeline, the rectifying holes include first rectifying holes 31 for communicating adjacent two levels of sub-rectifying cavities, and second rectifying holes 22 arranged on the side of the rectifying main body facing the inside of the pipeline for communicating with the inside of the pipeline.

[0066] In some specific embodiments, a partition extending along the radial direction of the rectifying cavity is provided inside the rectifying cavity. At least one partition is provided, and the rectifying cavity is divided into at least two levels of sub-rectifying cavities arranged in the direction towards the inside of the pipeline. A number of first rectifying holes 31 are provided on the partition, and the first rectifying holes 31 are used to communicate adjacent levels of sub-rectifying cavities. A second rectifying hole 22 is provided on the end face of the sub-rectifying cavity closest to the inside of the pipeline and facing the inside of the pipeline, and the second rectifying hole 22 is used to communicate the sub-rectifying cavity closest to the inside of the pipeline with the inside of the pipeline.

[0067] In this embodiment, by providing a partition inside the rectifying cavity, the argon gas can be dispersed by the first rectifying holes 31 on the partition during the process of flowing through the rectifying cavity, so that the argon gas can be evenly diffused in the radial cross-section of the entire rectifying cavity during the process of flowing towards the inside of the pipeline, which can further ensure that the air inside the pipeline is fully discharged and improve the protection effect on the back of the weld.

[0068] In this embodiment, when multiple partitions are provided, the multiple partitions are arranged at intervals along the circumferential direction of the rectifying cavity.

[0069] Preferably, as Figure 2 shown, in some specific embodiments, the rectifying cavity includes a first-level sub-rectifying cavity and a second-level sub-rectifying cavity arranged in sequence in the direction towards the inside of the pipeline.

[0070] In this embodiment, one partition is provided, and the rectifying cavity is divided into two sub-rectifying cavities. The sub-rectifying cavity on the side close to the inside of the pipeline is the second-level sub-rectifying cavity, and the sub-rectifying cavity on the side far from the inside of the pipeline is the first-level sub-rectifying cavity. The air inlet interface 11 is provided on the cavity wall of the first-level sub-rectifying cavity on the side far from the second-level sub-rectifying cavity. A number of first rectifying holes 31 are provided on the partition between the first-level sub-rectifying cavity and the second-level sub-rectifying cavity, and a number of second rectifying holes 22 communicating with the inside of the pipeline are provided on the cavity wall of the second-level sub-rectifying cavity on the side far from the first-level sub-rectifying cavity.

[0071] Preferably, as Figures 2 to 4 shown, in this embodiment, the aperture of the first rectifying hole 31 is smaller than the aperture of the second rectifying hole 22. Thus, during the process of argon gas flowing through the rectifying cavity, the argon gas can be dispersed by the first rectifying holes 31 with smaller apertures on the partition, so that the argon gas can be evenly diffused in the radial cross-section of the entire rectifying cavity during the process of flowing towards the inside of the pipeline. When the argon gas flows into the pipeline through the second rectifying holes 22 on the end face of the rectifying main body facing the inside of the pipeline, the second rectifying holes 22 with larger apertures can ensure the uniform flow of the argon gas in the entire radial cross-section while reducing the gas flow resistance, so that the flow state of the argon gas is in a laminar, stable and uniform state, ensuring sufficient argon protection at the weld and playing a role in saving argon gas.

[0072] In this embodiment, the aperture diameter of the first rectifying hole 31 is smaller than that of the second rectifying hole 22, which can also make the air pressure in the primary sub-rectifying cavity greater than that in the secondary sub-rectifying cavity. This is conducive to ensuring the flow rate of argon while enabling argon to flow stably into the pipeline interior. That is, the argon filling device for argon arc welding can utilize the primary sub-rectifying cavity to diffuse argon in the entire radial direction and use the secondary sub-rectifying cavity to stabilize the flow of argon, thereby improving the utilization rate of argon.

[0073] In this embodiment, the rectifying hole can be a round hole, a strip hole, a grid hole, or a combination of any of the above types of holes.

[0074] Preferably, in this embodiment, the rectifying hole is a small round hole or a small hole similar to a round shape.

[0075] In some possible embodiments, the rectifying holes can be arranged irregularly, as long as they cover the entire radial cross-section of the pipeline.

[0076] In some preferred embodiments, the rectifying holes are arranged radially.

[0077] In some preferred embodiments, as Figure 3 and Figure 4 shown, the rectifying holes are arranged at intervals along the circumferential direction of the pipeline and are provided with multiple circles arranged at intervals along the radial direction of the pipeline.

[0078] Specifically, the rectifying holes on different circumferences can correspond to each other one by one in the radial direction of the pipeline or can be staggered.

[0079] Preferably, in this embodiment, the rectifying holes are set as small round holes, arranged uniformly along the circumferential direction of the pipeline. And, along the arrangement direction away from the pipeline axis, the aperture diameter of the second rectifying holes 22 on different circumferences gradually increases; and / or, along the arrangement direction away from the pipeline axis, the arrangement density of the second rectifying holes 22 on different circumferences along the circumferential direction of the pipeline gradually increases.

[0080] In this embodiment, the arrangement density of the rectifying holes along the circumferential direction of the pipeline is used to represent the distance between two adjacent rectifying holes on the same circumference. The greater the arrangement density of the rectifying holes along the circumferential direction of the pipeline, the smaller the distance between two adjacent rectifying holes on the same circumference, the more the number of rectifying holes on this circumference, and the smaller the flow resistance to the air flow.

[0081] In this embodiment, the intake interface 11 is arranged at the center of the side of the rectifying main body facing away from the inside of the pipeline. Through the above arrangement, it can ensure the amount of argon at the position away from the intake interface 11 in the radial direction of the pipeline, and improve the uniformity of the diffusion of argon in the radial direction of the pipeline. At the same time, along the arrangement direction away from the pipeline axis, the aperture diameters of the second rectifying holes 22 on different circumferences gradually increase; and / or, along the arrangement direction away from the pipeline axis, the arrangement density of the second rectifying holes 22 on different circumferences along the circumferential direction of the pipeline gradually increases, which can make the flow rate near the pipe wall in the pipeline slightly larger than that at the center of the pipeline. Thus, it can give full play to the protective effect of argon on the weld, avoid the oxidation of the internal weld, and moreover, it can improve the utilization rate of argon, thereby saving the amount of argon used.

[0082] Preferably, in this embodiment, the aperture diameters of the first rectifying holes 31 located at least on the same circumference are the same, and the aperture diameters of the second rectifying holes 22 located at least on the same circumference are the same.

[0083] Preferably, in some possible embodiments, the aperture diameters of several circles of second rectifying holes arranged on the outer layer are larger than the aperture diameters of several circles of second rectifying holes arranged on the inner layer.

[0084] Specifically, the aperture diameters of several circles of second rectifying holes arranged on the outer layer are larger than the aperture diameters of several circles of second rectifying holes arranged on the inner layer; or, along the arrangement direction away from the pipeline axis, the aperture diameters of the second rectifying holes on different circumferences gradually increase.

[0085] In some possible embodiments, the aperture diameters of several circles of first rectifying holes arranged on the outer layer are larger than the aperture diameters of several circles of first rectifying holes arranged on the inner layer; the aperture diameters of several circles of second rectifying holes 22 arranged on the outer layer are larger than the aperture diameters of several circles of second rectifying holes 22 arranged on the inner layer.

[0086] In this embodiment, the statement that "the aperture diameter of the first rectifying hole 31 is smaller than the aperture diameter of the second rectifying hole 22" can specifically be: the aperture diameter of the first rectifying hole 31 located on the outermost circumference is smaller than the aperture diameter of the second rectifying hole 22 located on the innermost circumference; or, the circumferences where the first rectifying holes 31 and the second rectifying holes 22 are arranged correspond one by one, and the aperture diameter of the first rectifying hole 31 on the circumference at any distance from the pipeline axis is smaller than the aperture diameter of the second rectifying hole 22 on the rotating shaft at the same distance from the pipeline axis.

[0087] In some possible embodiments, the aperture diameters of all the first rectifying holes 31 are the same, and the aperture diameters of several circles of second rectifying holes 22 arranged on the outer layer are larger than the aperture diameters of several circles of second rectifying holes 22 arranged on the inner layer.

[0088] In this embodiment, the "first rectifying hole in the outer layer" is the first rectifying hole on the circumference relatively far from the axis of the pipeline, and the "first rectifying hole in the inner layer" is the first rectifying hole on the circumference relatively close to the axis of the pipeline. The "second rectifying hole 22 in the outer layer" is the second rectifying hole 22 on the circumference relatively far from the axis of the pipeline, and the "second rectifying hole 22 in the inner layer" is the second rectifying hole 22 on the circumference relatively close to the axis of the pipeline.

[0089] Specifically, in this embodiment, the second rectifying holes 22 are arranged in multiple circles spaced apart along the radial direction of the pipeline. The aperture diameters of the second rectifying holes 22 on one or more circles close to the axis of the pipeline are relatively small, and the aperture diameters of the second rectifying holes 22 on one or more circles far from the axis of the pipeline are relatively large.

[0090] In this embodiment, the aperture diameter of the first rectifying hole 31 is smaller than the aperture diameter of the second rectifying hole 22 on the circle closest to the axis of the pipeline.

[0091] In some possible embodiments, the aperture diameters of the first rectifying holes 31 are the same, and along the arrangement direction away from the axis of the pipeline, the aperture diameters of the second rectifying holes 22 on different circles gradually increase.

[0092] In this embodiment, the aperture diameter of the first rectifying hole 31 is smaller than the aperture diameter of the second rectifying hole 22 on the circle closest to the axis of the pipeline.

[0093] In some possible embodiments, along the arrangement direction away from the axis of the pipeline, the aperture diameters of the first rectifying holes 31 and the second rectifying holes 22 on different circles gradually increase.

[0094] Preferably, in this embodiment, the arrangement manners of the first rectifying holes 31 and the second rectifying holes 22 are the same, and both are arranged at intervals along the circumferential direction of the pipeline and are arranged in multiple circles spaced apart along the radial direction of the pipeline.

[0095] In this embodiment, the statement that "the aperture diameter of the first rectifying hole 31 is smaller than the aperture diameter of the second rectifying hole 22" may specifically be: the aperture diameter of the first rectifying hole 31 on the outermost circumference is smaller than the aperture diameter of the second rectifying hole 22 on the innermost circumference;

[0096] Or, the circles where the first rectifying holes 31 and the second rectifying holes 22 are arranged correspond one by one, and the aperture diameter of the first rectifying hole 31 on the circle at any distance from the axis of the pipeline is smaller than the aperture diameter of the second rectifying hole 22 on the rotating shaft at the same distance from the axis of the pipeline.

[0097] Preferably, in this embodiment, the argon-filled rectification device for argon arc welding further includes an argon-filled diffuser 5, which is arranged on the inner wall of the rectification cavity on the side facing away from the inside of the pipeline, and is in the shape of a cylinder protruding from the inner wall of the rectification cavity towards the inside of the rectification cavity; one end of the argon-filled diffuser 5 is arranged around the air inlet interface 11, the other end is closed, and a plurality of diffusion holes 51 for communicating with the inside of the rectification cavity are arranged on the circumferential side of the argon-filled diffuser 5.

[0098] Specifically, as Figure 2 , Figure 6 and Figure 7 shown, in this embodiment, the argon-filled diffuser 5 is arranged on the inner wall of the first-stage sub-rectification cavity on the side away from the second-stage sub-rectification cavity. The inner diameter of the argon-filled diffuser 5 is greater than or equal to the diameter of the air inlet interface 11. The argon-filled diffuser 5, the air inlet interface 11 and the rectification main body are coaxial. One end of the argon-filled diffuser 5 is connected to the inner side of the cavity wall of the first-stage sub-rectification cavity away from the second-stage sub-rectification cavity, and the end of the argon-filled diffuser 5 away from the air inlet interface 11 is closed.

[0099] A plurality of diffusion holes 51 for communicating with the inside of the rectification cavity are arranged on the circumferential side of the argon-filled diffuser 5. In some possible embodiments, the diffusion holes 51 are evenly arranged along the circumferential direction of the argon-filled diffuser 5, and are arranged in multiple circles at intervals along the axial direction of the argon-filled diffuser 5. The adjacent two circles of diffusion holes 51 are staggered in the circumferential direction of the argon-filled diffuser 5.

[0100] In this embodiment, by arranging the argon-filled diffuser 5, the argon gas entering through the air inlet interface diffuses into the first-stage sub-rectification cavity through the diffusion holes 51 on the circumferential side of the argon-filled diffuser 5, which can make the argon gas quickly and evenly distributed in the first-stage sub-rectification cavity. At the same time, with the flow resistance of the gas through the first-stage rectification plate with smaller-aperture first rectification holes, the gas distribution through the first-stage rectification plate is more uniform.

[0101] In this embodiment, the end of the argon-filled diffuser 5 away from the air inlet interface 11 can be in contact with the inner side of the cavity wall of the first-stage sub-rectification cavity close to the second-stage sub-rectification cavity, or can be spaced from the inner side of the cavity wall of the first-stage sub-rectification cavity close to the second-stage sub-rectification cavity.

[0102] In some possible embodiments, the rectification holes may further include auxiliary rectification holes.

[0103] Specifically, the auxiliary rectification holes are arranged on the outer periphery of the rectification main body on the side facing the inside of the pipeline and at least partially extend to the outer wall of the rectification main body; a plurality of auxiliary rectification holes are arranged at intervals along the circumferential direction of the rectification main body.

[0104] That is, the auxiliary rectifying holes are arranged on the outer periphery of the second rectifying hole 22. Specifically, one end of the rectifying main body inserted into the pipeline is set to a shape adapted to the inner shape of the pipeline. The outer wall of the end of the rectifying main body inserted into the pipeline is basically in contact with the inner wall of the pipeline. The end face of the rectifying main body facing the inside of the pipeline is set to a flat surface. The second rectifying hole 22 is arranged on this flat surface. The auxiliary rectifying holes are arranged at the corners between the side wall of the end of the rectifying main body facing the inside of the pipeline and the side wall of the rectifying main body extending along the circumferential direction of the pipeline.

[0105] In this embodiment, by arranging the auxiliary rectifying holes, the argon gas flowing into the pipeline from the auxiliary rectifying holes can flow along the inner wall of the pipeline, further improving the protection effect on the weld.

[0106] In some specific embodiments, the air inlet assembly 4 is an argon filling tool. The air inlet assembly 4 includes an argon gas cylinder and a hose connected to the argon gas cylinder. The output port of the argon filling tool is the nozzle of the hose.

[0107] Preferably, in this embodiment, the argon arc welding argon rectifying device is arranged at one end of the pipeline close to the weld.

[0108] As Figures 1 to 6 shown, in some specific embodiments, the rectifying main body includes a secondary rectifying plate 2 and a housing 1. The secondary rectifying plate 2 and the housing 1 are buckled together to form a rectifying cavity.

[0109] Specifically, the secondary rectifying plate 2 extends along the radial direction of the pipeline, has a diameter larger than the inner diameter of the pipeline and less than or equal to the outer diameter of the pipeline. A groove press is provided in the middle thereof and extends towards the inside of the pipeline. The outer diameter of the groove press is adapted to the inner diameter of the pipeline and is inserted at the end of the pipeline.

[0110] That is, as Figure 2 shown, a flanging 21 extending radially outward along the groove press is provided at the notch of the groove press. When the secondary rectifying plate 2 is inserted at the end of the pipeline, the flanging 21 on the outer periphery of the groove press abuts against the end of the pipeline to limit the secondary rectifying plate 2, and the outer wall of the groove press is in contact with the inner wall of the pipeline.

[0111] The housing 1 includes a peripheral wall sleeved on the outer periphery of the end of the pipeline and an end wall opposite to the end of the pipeline. The housing 1 is buckled on the end of the pipeline, thereby limiting the secondary rectifying plate 2 at the end of the pipeline. A rectifying cavity is formed between the housing 1 and the secondary rectifying plate 2. The air inlet interface 11 is arranged at the center of the end wall of the housing 1, and a rectifying hole is arranged on the bottom of the groove press.

[0112] Preferably, in this embodiment, the rectifying body further includes a first-stage rectifying plate 3, which is disposed between the end wall of the housing 1 and the bottom of the groove formed by pressing the second-stage rectifying plate 2. A first-stage sub-rectifying cavity is formed between the first-stage rectifying plate 3 and the housing, and a second-stage sub-rectifying cavity is formed between the first-stage rectifying plate 3 and the second-stage rectifying plate 2; the first rectifying holes 31 are disposed on the first-stage rectifying plate 3, and the second rectifying holes 22 are disposed on the bottom of the groove formed by pressing.

[0113] In some possible embodiments, the first-stage rectifying plate 3 and the second-stage rectifying plate 2 are sequentially clamped between the housing 1 and the pipeline.

[0114] Specifically, the diameter of the first-stage rectifying plate 3 is adapted to the inner diameter of the housing 1. Preferably, the diameter of the first-stage rectifying plate 3 is equal to the outer diameter of the pipeline. An annular limiting portion 12 for abutting and limiting the first-stage rectifying plate 3 is disposed on the end wall of the housing 1. Preferably, the annular limiting portion 12 is an annular rib disposed on the inner side of the end wall of the housing 1.

[0115] In some other possible embodiments, as Figures 4 to 6 shown, the diameter of the first-stage rectifying plate 3 is the same as the inner diameter of the groove formed by pressing the second-stage rectifying plate 2; on the groove wall of the groove formed by pressing, there are at least three limiting blocks 23 protruding radially inward from the groove formed by pressing. The end wall of the housing 1 is provided with an annular limiting portion 12 protruding toward the inside of the pipeline. The annular limiting portion 12 is an annular rib protruding coaxially from the inner side of the end wall. There is a gap between the annular rib and the peripheral wall of the housing 1. The inner diameter of the annular rib is less than or equal to the diameter of the first-stage rectifying plate 3. The first-stage rectifying plate 3 is installed in the groove formed by pressing the second-stage rectifying plate 2 and is clamped between the annular limiting portion 12 and the limiting blocks 23.

[0116] Preferably, as Figure 5 shown, in this embodiment, the groove formed by pressing the second-stage rectifying plate 2 includes an equal-diameter section 24 extending in the direction toward the inside of the pipeline, and a variable-diameter section 25 whose diameter gradually increases from the end of the equal-diameter section 24 in the extending direction toward the inside of the pipeline; the outer diameter of the end of the variable-diameter section 25 away from the equal-diameter section 24 is the same as the inner diameter of the pipeline; the diameter of the first-stage rectifying plate 3 is the same as the inner diameter of the equal-diameter section 24, and the limiting blocks 23 are disposed on the equal-diameter section 24 of the groove formed by pressing.

[0117] Preferably, in this embodiment, the reduced-diameter section 25 is arranged in the middle of the grooved pressing, and one end of the reduced-diameter section 25 away from the equal-diameter section 24, that is, the end of the reduced-diameter section 25 facing the inside of the pipeline, is attached to the inner wall of the pipeline. That is, the grooved pressing includes a first equal-diameter section arranged at the end of the reduced-diameter section 25 facing away from the inside of the pipeline and a second equal-diameter section arranged at the end of the reduced-diameter section 25 facing the inside of the pipeline. There is a gap between the outer periphery of the first equal-diameter section and the inner wall of the pipeline, and the outer periphery of the second equal-diameter section is attached to the inner wall of the pipeline.

[0118] In this embodiment, by setting the groove wall of the grooved pressing to include the equal-diameter section 24 and the reduced-diameter section 25, the positioning effect between the secondary rectifying plate and the pipeline can be improved. At the same time, the diffusion effect of argon to the outer periphery of the radial section of the pipeline can be improved, and the protection effect on the weld can be improved.

[0119] In this embodiment, the peripheral wall of the housing 1 and the outer wall of the pipeline can be snap-fitted and / or interference-fitted.

[0120] Preferably, a layer of flexible pad is arranged on the inner side of the peripheral wall of the housing 1. The flexible pad can be made of rubber material. The housing 1 is interference-fitted with the outer wall of the pipeline through the flexible pad to achieve fixation and sealing.

[0121] In this embodiment, when the outer wall of the pipeline is a cylindrical surface, the housing 1 and the pipeline can also be connected by threads.

[0122] In some possible embodiments, the first rectifying hole 31 and / or the second rectifying hole 22 are both arranged as cylindrical holes.

[0123] Preferably, in some possible embodiments, the diameters of the first rectifying hole 31 and / or the second rectifying hole 22 gradually increase in the direction close to the inside of the pipeline, so that the diffusion effect of argon in the radial direction of the pipeline can be further improved.

[0124] In this embodiment, the argon filling diffuser 5 can be formed on the inner side of the end wall of the housing, can also be bonded to the outer wall of the housing, or can be arranged such that the argon filling diffuser 5 is threadedly connected to the housing.

[0125] Preferably, in this embodiment, the housing 1, the primary rectifying plate 3, and the secondary rectifying plate 2 are arranged as metal parts.

[0126] Embodiment 2

[0127] In this embodiment, a use method of the argon arc welding argon filling rectifying device in the above Embodiment 1 is provided.

[0128] The first step is to select appropriate secondary rectifying plate 2, primary rectifying plate 3, and housing 1 according to the model of the pipeline;

[0129] In the second step, insert the secondary rectifying plate 2 into the end of the pipeline, and place the primary rectifying plate 3 inside the secondary rectifying plate 2, making the outer edge of the primary rectifying plate 3 abut against the limiting block 23 on the inner circumference of the secondary rectifying plate 2;

[0130] In the third step, sleuth the outer shell 1 on the end of the pipeline;

[0131] In the fourth step, fill argon into the inside of the rectifying main body through the air inlet interface 11 at the center of the outer shell 1.

[0132] In some possible embodiments, a joint is provided at the end of the hose of the air inlet assembly 4. The joint includes a joint body and a threaded head coaxially arranged with the joint body. The threaded head is inserted into the air inlet interface 11 of the outer shell 1, and the joint body abuts against the outer side of the end wall of the outer shell 1. An internal thread adapted to the external thread on the threaded head is provided on the inner circumference of the end of the argon filling diffuser 5. The argon filling diffuser 5 is screwed onto the threaded head and abuts against the inner side of the end wall of the outer shell 1. Thus, the argon filling diffuser 5 and the air inlet assembly 4 can be installed on the outer shell simultaneously.

[0133] In this embodiment, before filling argon, first calculate the volume of the internal space of the pipeline between the end of the pipeline and the weld according to the distance between the end of the pipeline and the weld, and control the flow rate of the filled argon to be greater than the volume of the internal space of the pipeline between the end of the pipeline and the weld.

[0134] Then, on the basis of keeping the argon filling, weld the weld to obtain a high-quality weld.

[0135] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, can make some changes or modifications by using the technical content prompted above into equivalent embodiments of equivalent changes. The implementation schemes in the above embodiments can be further combined or replaced. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention.

Claims

1. An argon arc welding argon filling rectifier device, characterized in that: It comprises a rectifying body and an air inlet interface (11) arranged at one end of a pipeline, wherein the air inlet interface (11) is arranged on a side of the rectifying body facing away from the inside of the pipeline and is used to connect to an air inlet component (4) for outputting argon gas; the rectifying body comprises: The secondary rectifier plate extends in the radial direction of the pipeline, has a diameter greater than the inner diameter of the pipeline and less than or equal to the outer diameter of the pipeline, and is provided with a groove profile in the middle of the secondary rectifier plate for plugging with the end of the pipeline, and the portion of the secondary rectifier plate located at the outer periphery of the notch of the groove profile abuts against the end of the pipeline; the groove profile includes a constant diameter section extending in the direction toward the inside of the pipeline, and a variable diameter section whose diameter gradually increases from the end of the constant diameter section in the extending direction toward the inside of the pipeline, and one end of the variable diameter section facing the inside of the pipeline abuts against the inner wall of the pipeline; The housing comprises a peripheral wall which is sleeved on the outer periphery of the end of the pipeline and is interference-fitted with the outer wall of the pipeline, and an end wall which is opposite to the end of the pipeline; The primary rectifying plate has the same diameter as the inner diameter of the equal diameter section. A stopper protruding radially inward is provided on the inner wall of the equal diameter section. An annular stopper protruding toward the inside of the pipe is provided in the middle of the end wall. The primary rectifying plate is sandwiched between the annular stopper and the stopper. Rectification holes are respectively arranged on the primary rectifying plate (3) and on the groove bottom of the groove pressing profile.

2. The argon arc welding argon filling rectifier device according to claim 1, characterized in that: A primary sub-rectifier cavity is formed between the primary rectifier plate (3) and the housing, and a secondary sub-rectifier cavity is formed between the primary rectifier plate (3) and the secondary rectifier plate (2); The rectifying hole on the primary rectifying plate (3) is a first rectifying hole (31) for connecting two adjacent sub-rectifying cavities; the rectifying hole on the groove bottom of the groove profile is a second rectifying hole (22) which is arranged on the side of the rectifying body facing the inside of the pipeline and is used for connecting with the inside of the pipeline.

3. The argon arc welding argon filling rectifier device according to claim 2, characterized in that: The aperture of the first rectifying hole (31) is smaller than the aperture of the second rectifying hole (22).

4. The argon arc welding argon filling rectifier device according to claim 2 or 3, characterized in that: The rectifying holes are arranged at intervals along the circumferential direction of the pipeline, and are provided with a plurality of circles arranged at intervals along the radial direction of the pipeline; Along the arrangement direction away from the pipeline axis, the apertures of the second rectifying holes (22) on different circumferences gradually increase; and / or, along the arrangement direction away from the pipeline axis, the arrangement density of the second rectifying holes (22) on different circumferences along the circumference of the pipeline gradually increases.

5. The argon arc welding argon filling rectifier device according to claim 4, characterized in that: The apertures of the first rectifying holes (31) are the same and smaller than the aperture of the second rectifying holes (22) located at the innermost periphery; or, The apertures of the first rectifying holes (31) on different circumferences gradually increase along the arrangement direction away from the pipeline axis, the aperture of the first rectifying holes (31) located at the outermost circumference is smaller than the aperture of the second rectifying holes (22) located at the innermost circumference, or the aperture of the first rectifying holes (31) on the circumference at any distance from the pipeline axis is smaller than the aperture of the second rectifying holes (22) on the rotating shaft at the same distance from the pipeline axis.

6. The argon arc welding argon filling rectifier device according to claim 2 or 3, characterized in that: It also includes an argon-filled diffuser (5), which is arranged on the inner wall of the first-stage rectifying cavity on the side facing away from the inside of the pipeline and is in the shape of a cylinder protruding from the inner wall of the first-stage rectifying cavity toward the inside of the first-stage rectifying cavity; One end of the argon-filled diffuser (5) is arranged around the air inlet interface (11), and the other end is closed, and a plurality of diffusion holes (51) for communicating with the interior of the first-stage sub-rectifier cavity are arranged on the peripheral side of the argon-filled diffuser (5).

7. The argon arc welding argon filling rectifier device according to any one of claims 1 to 3, characterized in that: The air inlet interface (11) is arranged at the center of the end wall of the housing (1).

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