Spray head and welding device

Abstract

The embodiment of the application discloses a nozzle and a welding device, and relates to the technical field of welding processing, wherein the nozzle is internally provided with an overflow channel, the nozzle is provided with a first end and a second end, the first end is provided with a liquid inlet hole which is communicated with the overflow channel, and the second end is provided with a liquid outlet hole which is communicated with the overflow channel; a backflow groove is arranged on the circumferential side of the nozzle, the second end is provided with a notch, and the notch is communicated between the liquid outlet hole and the backflow groove. The technical scheme provided by the embodiment of the application aims to improve the practicability and processing yield of the welding device.

Description

Technical Field

[0001] The embodiments in this application relate to the field of welding processing technology, and in particular to a nozzle mechanism and welding device. Background Technology

[0002] In related technologies, welding devices such as wave soldering can connect a nozzle to a flux supply system. The flux supply system supplies molten flux to the nozzle, so that the nozzle corresponds to the welding area on the workpiece to be processed. This allows the flux to flow accurately through the nozzle to the welding area to weld the pins of fixed components, thus realizing the welding processing operation of the welding device.

[0003] However, the molten welding fluid flowing out of the nozzle is not stable. During the welding process, the molten welding fluid may overflow and burn or damage the components around the welding area, which reduces the processing yield and practicality of the welding equipment. Utility Model Content

[0004] Several embodiments in this application propose a nozzle mechanism and a welding apparatus, which aim to improve the practicality of the welding apparatus and the yield of processed products.

[0005] One embodiment of this application provides a nozzle with a flow channel inside. The nozzle has a first end and a second end. The first end has an inlet hole that communicates with the flow channel, and the second end has an outlet hole that communicates with the flow channel. A return groove is provided on the periphery of the nozzle, and a notch is provided on the second end, the notch communicating with the outlet hole and the return groove.

[0006] In one embodiment, the liquid outlet has a rectangular cross-sectional shape and has two long sides and two short sides, wherein at least one of the short sides has the notch.

[0007] In one embodiment, the nozzle includes two first enclosures and two second enclosures, the two first enclosures being arranged at a distance from each other, the two second enclosures being arranged at a distance from each other, the second enclosures being disposed between the two first enclosures and connecting the two first enclosures; one end of the first enclosure is designated as the long side, one end of the second enclosure is designated as the short side, and at least one second enclosure and the two first enclosures surround the return groove.

[0008] In one embodiment, the flow channel includes a first flow channel and a second flow channel that are connected to each other. The liquid inlet is connected to the first flow channel, and the liquid outlet is connected to the second flow channel. The flow cross-sectional area of ​​the first flow channel is larger than that of the second flow channel.

[0009] In one embodiment, the cross-sectional area of ​​the first flow channel gradually decreases in the direction of liquid flow in the flow channel.

[0010] In one embodiment, the nozzle is provided with a flow limiting structure, which is disposed in the second flow channel and adjacent to the first flow channel. The flow limiting structure is provided with a flow limiting channel that extends through the flow limiting structure along the liquid flow direction of the flow channel.

[0011] In one embodiment, the flow-limiting channel includes at least two flow-limiting holes, which are arranged at intervals and symmetrically with the central axis of the flow channel as the center of symmetry.

[0012] In one embodiment, the cross-sectional area of ​​the flow channel is S1, and the sum of the cross-sectional areas of the at least two flow-limiting orifices is S2, where S2 ≥ 0.7 × S1.

[0013] In one embodiment, the reflux tank includes a direct current section and a guide section that are connected to each other. The guide section and the direct current section extend sequentially along the liquid flow direction of the flow channel, and the guide section is inclined to the direct current section.

[0014] One embodiment of this application also provides a welding apparatus, the welding apparatus including a welding flux supply system and a nozzle, the nozzle being the nozzle described above, the nozzle being connected to the welding flux supply system.

[0015] In the various embodiments provided in this application, a return groove is provided on the periphery of the nozzle mechanism, and a notch is provided at the second end of the nozzle to connect the liquid outlet hole and the return groove. When the liquid outlet hole of the nozzle flows out to weld the welding area of ​​the workpiece to be processed, the excess liquid can be guided to the return groove by the notch, so that the liquid can be returned for reuse. This avoids the liquid overflowing and flowing to the components around the welding area, and prevents the components around the welding area from being burned by the overflowing liquid. This achieves a better welding yield of the welding device and further improves the practicality and reliability of the nozzle. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments or prior art of this application, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of an embodiment of the nozzle provided in this application;

[0018] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0019] Figure 3 for Figure 1 A top view of an embodiment of the nozzle;

[0020] Figure 4 for Figure 1 A cross-sectional view of an embodiment of the nozzle.

[0021] Explanation of icon numbers:

[0022] 100. Nozzle; 10. First enclosure plate; 11. Long side; 30. Second enclosure plate; 31. Short side; 50. Flow limiting structure; 51. Flow limiting channel; 511. Flow limiting hole; 70. Flow passage; 71. First flow channel; 73. Second flow channel; 90. Return groove; 91. Direct flow section; 93. Guide section; 10a. Liquid inlet hole; 10b. Liquid outlet hole; 10c. Notch. Detailed Implementation

[0023] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of several embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] It should be noted that if directional indication is involved in multiple embodiments of this application, the directional indication is only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0025] Furthermore, if multiple embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0026] In related technologies, welding equipment such as wave soldering utilizes a nozzle connected to a solder flux supply system. The supply system delivers molten solder to the nozzle, aligning it with the welding area on the workpiece. This allows the solder flux to flow accurately through the nozzle to the welding area, welding the pins of fixed components and enabling the welding operation. However, the solder flux flowing from the nozzle is not stable, and during welding, it can easily overflow, causing burns or damage to components around the welding area, reducing the yield and practicality of the welding equipment.

[0027] It should be noted that most existing nozzles are cylindrical in structure. They are designed to weld components by placing the liquid outlet at the end of the cylindrical nozzle over the pins of the workpiece's soldering area on the integrated circuit board. Solder flows from the nozzle onto the pins, solidifying to achieve the soldering process. However, during soldering, the uneven distribution of solder from the nozzle outlet can easily cause some solder to overflow from the soldering area. This can result in the hot solder damaging surrounding components, negatively impacting the workpiece's soldering yield. To address these issues, this application proposes a nozzle 100.

[0028] Please see Figure 1 and Figure 4 In one embodiment of this application, the nozzle 100 is provided with a flow channel 70, and the nozzle 100 is provided with a first end and a second end. The first end is provided with an inlet hole 10a connected to the flow channel 70, and the second end is provided with an outlet hole 10b connected to the flow channel 70. A return groove 90 is provided on the periphery of the nozzle 100, and a notch 10c is provided on the second end, which connects the outlet hole 10b and the return groove 90.

[0029] In this application, the solder supply system can heat solder such as tin to melt it and form solder liquid. The melted solder liquid can then be transported to the nozzle 100 through a pipeline. The solder liquid flows out from the nozzle 100 and adheres to the soldering area between the pins of the component and the circuit board. After the solder liquid cools and solidifies, the component is firmly soldered on the circuit board, ensuring the stable soldering operation of the soldering device.

[0030] The nozzle 100 can be connected to the output end of the welding slurry supply system. For example, the first end of the nozzle 100 can be connected to one end of the welding slurry output pipe of the welding slurry supply system. The nozzle 100 can connect the inlet hole 10a to the welding slurry output end, so that the welding slurry flows into the flow channel 70 through the inlet hole 10a, and under the flow-gathering effect of the flow channel 70, it flows out stably from the outlet hole 10b to the welding area of ​​the workpiece to be processed, so as to realize the stable welding processing of the welding device.

[0031] During the welding operation, the welding device can position the second end of the nozzle 100 against the welding area of ​​the workpiece to be processed, allowing the leads of the components to be welded on the workpiece to pass through the liquid outlet 10b. This allows the molten welding liquid to flow out through the liquid outlet 10b and adhere to the leads and the welding area of ​​the workpiece. Specifically, by providing a return channel 90 around the nozzle 100 and a notch 10c connecting the liquid outlet 10b and the return channel 90 at the second end of the nozzle 100, excess molten welding liquid exceeding the outlet range of the liquid outlet 10b can be released through the notch 10c and flow into the return channel 90 under the surface tension of the molten welding liquid. This prevents the welding liquid from overflowing from the outlet 10b, effectively reducing the amount of welding liquid flowing out of the welding area of ​​the workpiece. This avoids the components around the welding area being affected by the scalding welding liquid, reducing the risk of damage to the components around the welding area, and enabling the workpiece to achieve a better processing yield, further improving the practicality and reliability of the nozzle 100.

[0032] It should be noted that the welding device can be equipped with a molten solder recovery mechanism connected to the return channel 90 of the nozzle 100, so that the molten solder overflowing from the outlet hole 10b of the nozzle 100 can be guided into the molten solder recovery mechanism through the return channel 90, thereby realizing the recycling of molten solder and reducing the waste of welding materials. Only one return channel 90 can be provided on the periphery of the nozzle 100; alternatively, at least two return channels 90 can be arranged at intervals on the periphery of the nozzle 100. In this case, a connecting notch 10c can be provided at the second end corresponding to one of the return channels 90, so that excess molten solder exceeding the outlet hole 10b can be released through the notch 10c and flow into at least two return channels 90 respectively, thus accelerating the recovery rate of excess molten solder, reducing the risk of molten solder overflow damaging components around the welding area, and further improving the structural reliability of the nozzle 100.

[0033] In one embodiment of this application, a return groove 90 is provided on the periphery of the nozzle 100 mechanism, and a notch 10c is provided at the second end of the nozzle 100 to connect the liquid outlet hole 10b and the return groove 90. When the welding liquid gushing from the liquid outlet hole 10b of the nozzle 100 is used for welding processing of the welding area of ​​the workpiece to be processed, the excess welding liquid can be guided to the return groove 90 by the notch 10c, so that the welding liquid can be returned for reuse by the return groove 90. This avoids the welding liquid overflowing and flowing to the components around the welding area, and prevents the components around the welding area from being burned by the overflowing welding liquid. This achieves a better welding processing yield of the welding device and further improves the practicality and reliability of the nozzle 100.

[0034] It should be noted that in the existing technology, the nozzle 100 is mostly set with a hollow cylindrical structure, and the flow cross-section of its liquid outlet end is circular. Since the circular liquid outlet hole 10b has a large inner diameter, its overall liquid outlet range is also large. In order to avoid the solder slick from the nozzle 100 from burning the components around the welding area, the nozzle 100 is usually set with a cylindrical structure with a small inner diameter that can only correspond to a small number of pins for welding. During the welding process, the nozzle 100 needs to be moved to each pin in turn to achieve spot welding, resulting in low production efficiency.

[0035] See Figures 1 to 3 In one embodiment of this application, the liquid outlet 10b has a rectangular cross-sectional shape and is provided with two long sides 11 and two short sides 31, wherein at least one short side 31 is provided with a notch 10c.

[0036] In this embodiment, by setting the cross-sectional shape of the liquid outlet 10b to a rectangle, the liquid outlet 10b can have two opposing long sides 11 and two opposing short sides 31. The long sides 11 and short sides 31 are arranged perpendicularly, and the size of the long side 11 is longer than that of the short side 31. This allows the liquid outlet 10b to have a larger liquid outlet range along the extension direction of the long side 11 and a smaller liquid outlet range along the extension direction of the short side 31. This enables the nozzle 100 to utilize the rectangular liquid outlet 10b to simultaneously correspond to multiple pins arranged side by side along the long side 11 of the liquid outlet 10b, allowing the nozzle 100 to simultaneously output welding liquid to weld multiple side by side pins, effectively improving the welding processing efficiency of the welding device.

[0037] By setting a notch 10c at the short side 31 of the outlet hole 10b, the molten solder can overflow from the short side 31 of the outlet hole 10b under the action of surface tension and flow into the return tank 90. ​​This better avoids the molten solder overflowing from the long side 11 of the outlet hole 10b and affecting the components around the welding area, and further improves the structural stability and reliability of the nozzle 100.

[0038] Furthermore, the welding device can also utilize the nozzle 100 or the workpiece to be processed to move along the long side 11 of the liquid outlet 10b, enabling the welding device to quickly weld multiple parallel welding areas on the workpiece, which is beneficial to further improve the welding efficiency of the welding device. At this time, the height of the notch 10c at the short side 31 can be set to correspond to the length of the pin, so that the notch 10c can better avoid the nozzle 100 or the workpiece from being moved for welding. For example, the height of the notch 10c can usually be set between 2mm and 3.5mm, so that the height of the notch 10c can better adapt to the common component pin lengths, thus improving the adaptability of the welding device.

[0039] See Figure 1 and Figure 2 In one embodiment of this application, the nozzle 100 includes two first enclosure plates 10 and two second enclosure plates 30. The two first enclosure plates 10 are arranged at a distance from each other, and the two second enclosure plates 30 are arranged at a distance from each other. The second enclosure plate 30 is disposed between the two first enclosure plates 10 and connects the two first enclosure plates 10. One end of the first enclosure plate 10 is set as the long side 11, and one end of the second enclosure plate 30 is set as the short side 31. At least one second enclosure plate 30 and the two first enclosure plates 10 surround a return groove 90.

[0040] In this embodiment, the nozzle 100 can be configured as a whole square structure, with two first surrounding plates 10 and two second surrounding plates 30 connected perpendicularly to each other. This overall square structure allows the welding molten metal to flow more smoothly through the outlet holes 10b and onto the welding area, ensuring stable welding operations. In this configuration, the two first surrounding plates 10 can serve as the long side 11 of the nozzle 100, and the two second surrounding plates 30 can serve as the short side 31 of the nozzle 100. This ensures that the first surrounding plates 10 form the long side 11 of the outlet holes 10b at the end edge of the second end of the nozzle 100, and the second surrounding plates 30 form the short side 31 of the outlet holes 10b at the end edge of the second end of the nozzle 100.

[0041] Furthermore, the nozzle 100 can have at least one of the second enclosure plates 30 positioned between the two first enclosure plates 10, so that the two first enclosure plates 10 and the second enclosure plates 30 can form a return channel 90 on the outside of the nozzle 100. At this time, a notch 10c can be provided at the top of the second enclosure plate 30 forming the return channel 90, so that the welding liquid can flow steadily into the return channel 90 from the top notch 10c of the second enclosure plate 30 for recycling, effectively preventing the welding liquid from overflowing from the top of the first enclosure plate 10, and realizing a more stable welding operation of the welding device. The nozzle 100 can have a notch 10c at the top of a second enclosure plate 30, with the second enclosure plate 30 and the side edge of the first enclosure plate 10 spaced a certain distance apart, so that the second enclosure plate 30 and the two first enclosure plates 10 form a return channel 90. In this case, the second enclosure plate 30 can be set on the side away from the nozzle 100 or the relative movement direction of the workpiece, so that the notch 10c can better avoid the pin and ensure the continuous welding process of the welding device. Alternatively, the nozzle 100 can have notches 10c at the top of both second enclosure plates 30, and the two enclosure plates can form two return channels 90 with the first enclosure plates 10 respectively. The two return channels 90 are set on opposite sides of the nozzle 100. By using the two second enclosure plates 30 to form two return channels 90, the rate of overflowing welding liquid return can be further improved, the overflow of welding liquid into the welding area can be better avoided, and the welding device can achieve a better welding yield.

[0042] The second enclosure 30 can be recessed at the top to form a notch 10c, or the top height of the second enclosure 30 can be set lower than the top height of the first enclosure 10, so that the top of the second enclosure 30 and the first enclosure 10 can be enclosed to form a notch 10c, which is conducive to improving the production and processing convenience of the nozzle 100.

[0043] See Figure 4 In one embodiment of this application, the flow channel 70 includes a first flow channel 71 and a second flow channel 73 that are connected to each other. The inlet hole 10a is connected to the first flow channel 71, and the outlet hole 10b is connected to the second flow channel 73. The flow cross-sectional area of ​​the first flow channel 71 is larger than the flow cross-sectional area of ​​the second flow channel 73.

[0044] This configuration allows the nozzle 100 to be stably connected to the output end of the welding slurry supply system via an inlet hole 10a with a large cross-sectional area and a first flow channel 71. This ensures that the welding slurry supply system can stably output a certain amount of welding slurry to the nozzle 100. Then, the welding slurry flow is narrowed using a second flow channel 73 with a smaller cross-sectional area, so that the outlet range of the nozzle 100's outlet hole 10b corresponds to the welding area on the workpiece. This enables precise welding of the workpiece and effectively improves the processing accuracy of the welding device.

[0045] The narrowing of the liquid flow by the second flow channel 73 also helps to better balance the overall flow velocity of the liquid flow and avoid large fluctuations in the liquid flow caused by a large flow area. This allows the welding liquid flowing out of the nozzle 100 to achieve a more uniform overall welding effect and further improve the welding yield of the workpiece.

[0046] See Figure 4 In one embodiment of this application, the cross-sectional area of ​​the first flow channel 71 is gradually reduced in the direction of liquid flow in the flow channel 70.

[0047] In this embodiment, by gradually reducing the cross-sectional area of ​​the first flow channel 71, the overall flow area of ​​the welding liquid can be gradually reduced as it flows through the first flow channel 71, so that the flow can be gradually narrowed. This helps to reduce the impact of the flow when the flow area changes abruptly, and avoids the nozzle 100 from being blown out of the welding device due to excessive flow pressure, thereby further improving the overall structural stability and reliability of the welding device.

[0048] The first flow channel 71 can adopt a conical flow channel structure design so that the inner wall of the first flow channel 71 is streamlined, so that the solder can flow more smoothly through the first flow channel 71 and further reduce the obstruction to the flow velocity.

[0049] See Figure 3 and Figure 4In one embodiment of this application, the nozzle 100 is provided with a flow limiting structure 50, which is located in the second flow channel 73 and adjacent to the first flow channel 71. The flow limiting structure 50 is provided with a flow limiting channel 51, which is provided through the flow limiting structure 50 along the liquid flow direction of the flow channel 70.

[0050] In this embodiment, by setting a flow-limiting structure 50 in the second flow channel 73, and setting a limiting channel that runs through the liquid flow direction, the flow-limiting structure 50 can play a certain role in limiting and buffering the flow of welding liquid. That is, during the flow of liquid in the second flow channel 73, the flow-limiting structure 50 can disperse the overall liquid flow pressure, so that the liquid flow passes through the flow-limiting channel 51 and flows to the liquid outlet 10b evenly. This makes the overall liquid flow pressure distribution through the liquid outlet 10b more balanced, improves the stability of the welding liquid flow, reduces the welding difference at different welding sites, and achieves a better welding yield of the workpiece.

[0051] The flow-limiting structure 50 can be a series of baffles arranged at intervals, which can be used to create multiple gaps in the second flow channel 73 to form a flow-limiting channel 51; or, the flow-limiting structure 50 can be a blocking block structure set in the second flow channel 73, which can form a flow-limiting channel 51 by setting through holes on the blocking block, so that the flow-limiting structure 50 can withstand the liquid pressure more stably and further improve the structural stability and reliability of the nozzle 100.

[0052] See Figure 3 and Figure 4 In one embodiment of this application, the flow restriction channel 51 includes at least two flow restriction holes 511, which are arranged at intervals and symmetrically arranged with the central axis of the flow channel 70 as the center of symmetry.

[0053] In this embodiment, by using at least two spaced and parallel flow-limiting holes 511 to form an integral flow-limiting channel 51, the flow-limiting structure 50 can achieve a more stable and evenly distributed liquid flow pressure, further reducing the fluctuation when the liquid flows out of the outlet hole 10b, so that the welding device can better achieve a consistent welding processing effect in multiple welding areas, which is conducive to improving the welding processing yield of the workpiece.

[0054] By symmetrically arranging at least two flow-limiting holes 511 around the central axis of the flow channel 70, the flow-limiting holes 511 can be more evenly distributed on the flow-limiting structure 50. This allows the molten welding liquid to flow more evenly as it passes through the flow-limiting structure 50, enabling the liquid to flow out of the outlet hole 10b more smoothly and further improving the welding yield of the workpiece.

[0055] In one embodiment of this application, the cross-sectional area of ​​the flow channel 70 is S1, and the sum of the cross-sectional areas of the at least two flow-limiting holes 511 is S2, where S2 ≥ 0.7 × S1.

[0056] In this embodiment, by making S2≥0.7×S1, that is, by making the overall flow area of ​​the flow-limiting channel 51 occupy at least 70% of the overall flow area of ​​the flow-limiting channel 70, the flow-limiting structure 50 can disperse the liquid flow pressure to a certain extent while ensuring the smooth flow of the liquid flow, reducing the influence of the flow-limiting structure 50 on the liquid flow rate, so that the welding liquid flow can flow more stably through the liquid outlet hole 10b to the welding area, further improving the structural stability and reliability of the welding device.

[0057] Furthermore, the flow cross-sectional areas of at least two limiting holes can be set equally to facilitate the production of the nozzle 100; alternatively, based on the flow distribution of the liquid, i.e., the liquid pressure is higher at the central axis of the flow channel 70 and lower around the central axis, the flow limiting holes 511 near the central axis of the flow channel 70 can be set with smaller flow cross-sectional areas, while the flow limiting holes 511 far from the central axis can be set with larger flow cross-sectional areas. This allows the liquid flow to achieve a better uniform distribution of liquid pressure after passing through the flow limiting structure 50, further improving the practicality of the nozzle 100.

[0058] See Figure 4 In one embodiment of this application, the return tank 90 includes a direct current section 91 and a guide section 93 that are connected to each other. The guide section 93 and the direct current section 91 extend sequentially along the liquid flow direction of the flow channel 70, and the guide section 93 is inclined to the direct current section 91.

[0059] In this embodiment, the welding molten metal enters the flow channel 70 through the inlet and flows out at the outlet 10b to the welding area of ​​the workpiece. At this time, the excess welding molten metal that exceeds the outlet range of the outlet 10b can flow into the return tank 90 through the notch 10c under the action of surface tension. After passing through the return tank 90, the welding molten metal can flow to the welding molten metal recycling mechanism to realize the recycling and reuse of the welding molten metal. In this design, the flow direction of the solder in the flow channel 70 is opposite to that in the return tank 90. ​​By sequentially arranging a guide section 93 and a direct flow section 91 along the liquid flow direction of the flow channel 70 in the return tank 90, the guide section 93 can be located on the outer periphery of the first end of the nozzle 100. The inclined guide section 93 can play a certain guiding and diverting role, so that when the solder flows back from the direct flow section 91, the guide section 93 can better guide the solder into the solder recovery mechanism, reduce the stagnation of the solder in the return tank 90, further increase the flow rate of the solder in the return tank 90, and better reduce the overflow of the solder through the outlet hole 10b to the outside of the welding area, avoid the solder burning the components around the welding area, and further improve the practicality and reliability of the welding device.

[0060] This application also proposes a welding apparatus, which includes a welding flux supply system and a nozzle 100. The specific structure of the nozzle 100 is as described in the above embodiments. Since this welding apparatus adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0061] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A nozzle, characterized in that, The nozzle has a flow channel inside, and the nozzle has a first end and a second end. The first end has a liquid inlet hole that communicates with the flow channel, and the second end has a liquid outlet hole that communicates with the flow channel. The nozzle has a reflux groove on its periphery and a notch at the second end, the notch connecting the liquid outlet and the reflux groove.

2. The nozzle as described in claim 1, characterized in that, The liquid outlet has a rectangular cross-sectional shape and has two long sides and two short sides, wherein at least one of the short sides has the notch.

3. The nozzle as described in claim 2, characterized in that, The nozzle includes two first enclosures and two second enclosures. The two first enclosures are arranged with a distance between them, and the two second enclosures are arranged with a distance between them. The second enclosures are located between the two first enclosures and are connected to the two first enclosures. One end of the first enclosure is designated as the long side, and one end of the second enclosure is designated as the short side. The return trough is formed by at least one second enclosure and two first enclosures.

4. The nozzle as described in claim 1, characterized in that, The flow channel includes a first flow channel and a second flow channel that are connected to each other. The liquid inlet is connected to the first flow channel, and the liquid outlet is connected to the second flow channel. The flow cross-sectional area of ​​the first flow channel is larger than that of the second flow channel.

5. The nozzle as described in claim 4, characterized in that, In the direction of liquid flow in the flow channel, the cross-sectional area of ​​the first flow channel is gradually reduced.

6. The nozzle as described in claim 4, characterized in that, The nozzle is provided with a flow limiting structure, which is located in the second flow channel and adjacent to the first flow channel. The flow limiting structure is provided with a flow limiting channel, which is provided through the flow limiting structure along the liquid flow direction of the flow channel.

7. The nozzle as described in claim 6, characterized in that, The flow-limiting channel includes at least two flow-limiting holes, which are arranged at intervals and symmetrically with the central axis of the flow channel as the center of symmetry.

8. The nozzle as described in claim 7, characterized in that, The cross-sectional area of ​​the flow passage is S1, and the sum of the cross-sectional areas of the at least two flow-limiting orifices is S2, where S2 ≥ 0.7 × S1.

9. The nozzle as described in claim 1, characterized in that, The reflux tank includes a direct current section and a guide section that are connected to each other. The guide section and the direct current section extend sequentially along the liquid flow direction of the flow channel, and the guide section is inclined to the direct current section.

10. A welding apparatus, characterized in that, The welding apparatus includes a welding slurry supply system and a nozzle, wherein the nozzle is the nozzle according to any one of claims 1 to 9, and the nozzle is connected to the welding slurry supply system.

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