Nozzle, laser welding head and laser welding device

Abstract

The utility model discloses a nozzle, a laser welding head and a laser welding device, and relates to the laser welding device, the nozzle has an axial direction and a radial direction, and the nozzle is provided with an air inlet, an air outlet, a plurality of overflowing channels and a plurality of flow guide channels. The air inlet and the air outlet are formed in the two ends, in the axial direction, of the nozzle respectively, the multiple flow passing channels and the multiple flow guide channels are all arranged between the air inlet and the air outlet, the multiple flow passing channels and the multiple flow guide channels are arranged in a staggered mode in the axial direction, and any adjacent flow passing channel and flow guide channel communicate with each other. Wherein the multiple flow passing channels and the multiple flow guiding channels are coaxially arranged, the drift diameters of the communicating positions of any adjacent flow passing channels and flow guiding channels are the same, and the drift diameters of any flow guiding channels are gradually reduced from the air inlet to the air outlet in the axial direction. According to the nozzle, the adhesion phenomenon of welding slag in the nozzle can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser welding device technical field, specifically, relate to a nozzle, laser welding head and laser welding device. BACKGROUND

[0002] In the laser welding device, the nozzle of the laser welding head is usually used to guide the protective gas, prevent the welding area from oxidizing, and control the focusing direction of the laser beam, which is an important part to ensure the welding effect. In the traditional nozzle, when working continuously for a long time at high intensity, the inner cavity of the nozzle is easy to adsorb the welding slag. The attachment of the welding slag will change the airflow path on the one hand, affect the flow stability of the protective gas, and further affect the weld quality. On the other hand, high-temperature welding slag attached to the inner wall of the nozzle is extremely easy to cause local overheating or even ablation of the nozzle, and in severe cases, it may also block the nozzle channel, causing the nozzle to be unable to be used normally. SUMMARY

[0003] Therefore, the purpose of the present application is to overcome the shortcomings of the prior art and provide a nozzle that can reduce the attachment of welding slag in the nozzle.

[0004] The present application also provides a laser welding head.

[0005] The present application also provides a laser welding device.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] The nozzle according to the first aspect of the present application has an axial direction and a radial direction, and is provided with an air inlet, an air outlet, a plurality of flow passages and a plurality of flow guide passages. The air inlet and the air outlet are respectively provided at the two ends of the nozzle along the axial direction. The plurality of flow passages and the plurality of flow guide passages are arranged between the air inlet and the air outlet, and the plurality of flow passages and the plurality of flow guide passages are staggered along the axial direction. Any adjacent flow passage and flow guide passage are in communication. The plurality of flow passages and the plurality of flow guide passages are coaxially arranged, and the communication passages of any adjacent flow passage and flow guide passage have the same diameter. The diameter of any flow guide passage gradually decreases from the air inlet to the air outlet along the axial direction.

[0008] The nozzle of the present application has the following advantages:

[0009] In the nozzle of the present application, when welding the welded piece, the gas outlet is arranged towards the welded piece, and the welding slag may enter the nozzle through the gas outlet, the protective gas enters the nozzle through the gas inlet, and then flows through the multiple flow channels in the axial direction, and finally is blown out through the gas outlet, so that the welding slag adhering to the inner wall of the nozzle can be blown out of the nozzle by the protective gas. In this process, since the multiple flow channels and the multiple flow guide channels are staggered in the axial direction, and the diameter of any flow guide channel gradually decreases from the gas inlet to the gas outlet in the axial direction, a tapered flow guide channel can be arranged between any two flow channels, and the small end of the tapered flow guide channel is arranged towards the gas outlet, so as to play a role in gathering and guiding the protective gas through the tapered flow guide channel, so as to ensure the flow of the protective gas in the nozzle from the gas inlet to the gas outlet in the axial direction, and improve the flow speed of the protective gas, thereby improving the smoothness of the welding slag moving along the inner wall of the nozzle in the axial direction. Further, since the multiple flow channels and the multiple flow guide channels are coaxially arranged, and the diameters of the communication parts of any adjacent flow channel and flow guide channel are the same, the inner wall of the nozzle is free of steps, so as to improve the flow guiding effect of the protective gas, and further improve the smoothness of the welding slag moving along the inner wall of the nozzle in the axial direction towards the gas outlet, thereby reducing the adhesion of the welding slag in the nozzle.

[0010] According to the nozzle of the first aspect of the present application, the flow guide channel includes a first flow guide channel, a second flow guide channel and a third flow guide channel, and the flow channel includes a first flow channel and a second flow channel. The first flow guide channel, the second flow guide channel and the third flow guide channel are arranged in sequence in the axial direction, and the third flow guide channel is in communication with the gas outlet, the first flow guide channel is in communication with the gas inlet, the first flow channel is arranged between the second flow guide channel and the first flow guide channel, and the second flow channel is arranged between the third flow guide channel and the second flow guide channel.

[0011] According to the nozzle of the first aspect of the present application, the angle between the side wall of the first flow guide channel and the axial direction is α1, the angle between the side wall of the second flow guide channel and the axial direction is α2, and the angle between the side wall of the third flow guide channel and the axial direction is α3, and satisfy: 10°≤α1≤13°, 10°≤α2≤13°, 10°≤α3≤13°.

[0012] According to the nozzle of the first aspect of the present application, the diameter of the gas outlet is D1, the diameter of the second flow channel is D2, and the diameter of the first flow channel is D3, and satisfy: 7mm≤D1≤9mm, 11mm≤D2≤13mm, 16.5mm≤D3≤18.5mm.

[0013] The nozzle according to the first aspect of the present application has a length L1 along the axial direction, and 45mm≤L1≤60mm is satisfied.

[0014] The nozzle according to the first aspect of the present application comprises a nozzle portion and a connecting portion, the connecting portion is arranged at one end of the nozzle portion away from the gas outlet along the axial direction, and the outer diameter of the nozzle portion gradually decreases from the gas inlet to the gas outlet along the axial direction.

[0015] The nozzle according to the first aspect of the present application further has a circumferential direction, the outer surface of one end of the nozzle portion close to the connecting portion along the axial direction is provided with a plurality of anti-skid grooves, the plurality of anti-skid grooves are arranged at intervals along the circumferential direction of the nozzle portion, and each anti-skid groove is recessed towards the inside of the nozzle portion along the radial direction.

[0016] The surface of the connecting portion has an external thread according to the first aspect of the present application.

[0017] The laser welding head according to the second aspect of the present application comprises the nozzle as described above.

[0018] The laser welding device according to the third aspect of the present application comprises the laser welding head as described above. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0020] Figure 1 The three-dimensional structure of the nozzle in the present application is shown Figure 1 ;

[0021] Figure 2 The three-dimensional structure of the nozzle in the present application is shown Figure 2 ;

[0022] Figure 3 The cross-sectional structure of the nozzle in the present application is shown.

[0023] Explanation of main element symbols:

[0024] 100 - inlet; 200 - outlet; 300 - flow passage; 310 - first flow passage; 320 - second flow passage; 400 - flow guide passage; 410 - first flow guide passage; 420 - second flow guide passage; 430 - third flow guide passage; 500 - nozzle portion; 510 - anti-slip groove; 600 - connection portion;

[0025] x - axial direction; y - radial direction; z - circumferential direction. DETAILED DESCRIPTION

[0026] Embodiments of the present application are described below in detail with reference to the accompanying drawings, in which like or similar elements are denoted by like or similar reference symbols throughout the drawings. The embodiments described below are examples in which the present application is applied, and are merely for the purpose of explaining the present application, and are not to be understood as limiting the present application.

[0027] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the purpose of facilitating the description of the present application and simplifying the description, and are not to be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0028] In addition, the terms "first", "second", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0029] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing", and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In the present application, unless specifically defined and limited otherwise, a first feature is "on", "above", or "under" a second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact with an intervening medium therebetween. Also, a first feature "over", "above", and "on" a second feature can mean that the first feature is directly on the second feature, or that the first feature is indirectly in the second feature's general vertical direction. A first feature "under", "below", and "underneath" a second feature can mean that the first feature is directly below the second feature, or that the first feature is indirectly in the second feature's general vertical direction.

[0031] Referring to Figures 1 to 3 The nozzle according to the embodiments of the present application has an axial direction x and a radial direction y, and is provided with an air inlet 100, an air outlet 200, a plurality of flow passages 300, and a plurality of guide passages 400.

[0032] Specifically, the air inlet 100 and the air outlet 200 are respectively arranged at the two ends of the nozzle along the axial direction x, the plurality of flow passages 300 and the plurality of guide passages 400 are arranged between the air inlet 100 and the air outlet 200, and the plurality of flow passages 300 and the plurality of guide passages 400 are staggered along the axial direction x, and any adjacent flow passage 300 and guide passage 400 are in communication; wherein the plurality of flow passages 300 and the plurality of guide passages 400 are coaxially arranged, and the communication passages of any adjacent flow passage 300 and guide passage 400 have the same diameter, and the diameter of any guide passage 400 gradually decreases from the air inlet 100 to the air outlet 200 along the axial direction x.

[0033] It should be noted that the axial direction x is the direction indicated by x in Figure 3 , and the radial direction y is the direction indicated by y in Figure 3 .

[0034] In the nozzle of the present application, when welding the welded piece, the gas outlet 200 is arranged towards the welded piece, the welding slag can enter the nozzle through the gas outlet 200, the protective gas enters the nozzle through the gas inlet 100, and then flows through the plurality of flow channels 300 in the axial direction x in turn, and finally is blown out through the gas outlet 200, so that the welding slag adhering to the inner wall of the nozzle can be blown out of the nozzle by the protective gas in the direction of the gas outlet 200. In this process, since the plurality of flow channels 300 and the plurality of flow guide channels 400 are staggered arranged along the axial direction x, and the diameter of any flow guide channel 400 gradually decreases along the axial direction x from the gas inlet 100 to the gas outlet 200, a tapered flow guide channel 400 can be arranged between any two flow channels 300, and the small end of the tapered flow guide channel 400 is arranged towards the gas outlet 200, so that the tapered flow guide channel 400 can play a role in gathering and guiding the protective gas, ensuring that the protective gas flows from the gas inlet 100 to the gas outlet 200 along the axial direction x in the nozzle, and improving the flow speed of the protective gas, thereby improving the smoothness of the welding slag moving along the inner wall of the nozzle in the axial direction x. Further, since the plurality of flow channels 300 and the plurality of flow guide channels 400 are coaxially arranged, and the diameters of the communication portions of any adjacent flow channel 300 and flow guide channel 400 are the same, the inner wall of the nozzle can be ensured to be free of steps, so as to improve the flow guiding effect of the protective gas, and further improve the smoothness of the welding slag moving along the inner wall of the nozzle in the axial direction x towards the gas outlet 200, thereby reducing the adhesion of the welding slag in the nozzle.

[0035] Referring to Figure 3 As shown in the figure, the flow guide channel 400 includes a first flow guide channel 410, a second flow guide channel 420, and a third flow guide channel 430, the flow channel 300 includes a first flow channel 310 and a second flow channel 320, the first flow guide channel 410, the second flow guide channel 420, and the third flow guide channel 430 are arranged along the axial direction x in turn, and the third flow guide channel 430 is in communication with the gas outlet 200, the first flow guide channel 410 is in communication with the gas inlet 100, the first flow channel 310 is arranged between the second flow guide channel 420 and the first flow guide channel 410, and the second flow channel 320 is arranged between the third flow guide channel 430 and the second flow guide channel 420.

[0036] In the embodiment, when the shielding gas enters into the nozzle through the gas inlet 100, the shielding gas will flow through the first guide passage 410, the first flow passage 310, the second guide passage 420, the second flow passage 320 and the third guide passage 430 in sequence and flow out of the nozzle at the gas outlet 200. In the process, the shielding gas will first flow through the first guide passage 410 to guide the flow of the shielding gas through the first guide passage 410, so as to improve the direction accuracy of the shielding gas flowing in the axial direction x in the nozzle. Meanwhile, when the shielding gas flows from the first flow passage 310 to the second flow passage 320, the direction accuracy of the shielding gas flowing in the axial direction x can be further improved by the second guide passage 420. Further, when the shielding gas flows from the second flow passage 320 to the gas outlet 200, the direction accuracy of the shielding gas flowing in the axial direction x can be further improved by the third guide passage 430, so as to improve the flow efficiency and flow speed of the shielding gas flowing in the axial direction x from the gas inlet 100 to the gas outlet 200.

[0037] With reference back to Figure 3 As shown in FIG. 4, the angle between the side wall of the first guide passage 410 and the axial direction x is a1, and 10°≤a1≤13° is satisfied.

[0038] Specifically, in the embodiment, a1 can be 10°, 10.5°, 11°, 11.5°, 12°, 12.5°, 13°, etc.

[0039] In the embodiment, if the angle a1 between the side wall of the first guide passage 410 and the axial direction x is less than 10°, the taper of the first guide passage 410 will be too small, which will reduce the guiding effect of the first guide passage 410 on the shielding gas. If the angle a1 between the side wall of the first guide passage 410 and the axial direction x is greater than 13°, the taper of the first guide passage 410 will be too large, which will increase the friction of the welding slag on the side wall of the first guide passage 410 moving in the axial direction, and further reduce the moving speed and effect of the welding slag in the axial direction. If the angle a1 between the side wall of the first guide passage 410 and the axial direction x satisfies 10°≤a1≤13°, the guiding effect of the first guide passage 410 on the shielding gas can be ensured, and the influence of the first guide passage 410 on the movement of the welding slag can be reduced.

[0040] With reference back to Figure 3 As shown in FIG. 4, the angle between the side wall of the second guide passage 420 and the axial direction x is a2, and 10°≤a2≤13° is satisfied.

[0041] Specifically, in the embodiment, a2 can be 10°, 10.5°, 11°, 11.5°, 12°, 12.5°, 13°, etc.

[0042] In the embodiment, if the angle a2 between the side wall of the second flow guide channel 420 and the axial direction x is < 10°, the taper of the second flow guide channel 420 is too small, which results in the reduced flow guiding effect of the second flow guide channel 420 on the protective gas. If the angle a2 between the side wall of the second flow guide channel 420 and the axial direction x is > 13°, the taper of the second flow guide channel 420 is too large, which results in the excessive friction of the welding slag on the side wall of the second flow guide channel 420 moving in the axial direction, further resulting in the reduced speed and effect of the welding slag moving in the axial direction. When the angle a2 between the side wall of the second flow guide channel 420 and the axial direction x satisfies: 10°≤a2≤13°, the flow guiding effect of the second flow guide channel 420 on the protective gas can be ensured, and the influence of the second flow guide channel 420 on the movement of the welding slag can be reduced.

[0043] With continued reference to Figure 3 As shown in FIG. 6, the angle between the side wall of the third flow guide channel 430 and the axial direction x is a3, which satisfies: 10°≤a3≤13°.

[0044] Specifically, in the embodiment, a3 can be 10°, 10.5°, 11°, 11.5°, 12°, 12.5°, 13°, and the like.

[0045] In the embodiment, if the angle a3 between the side wall of the third flow guide channel 430 and the axial direction x is < 10°, the taper of the third flow guide channel 430 is too small, which results in the reduced flow guiding effect of the third flow guide channel 430 on the protective gas. If the angle a3 between the side wall of the third flow guide channel 430 and the axial direction x is > 13°, the taper of the third flow guide channel 430 is too large, which results in the excessive friction of the welding slag on the side wall of the third flow guide channel 430 moving in the axial direction, further resulting in the reduced speed and effect of the welding slag moving in the axial direction. When the angle a3 between the side wall of the third flow guide channel 430 and the axial direction x satisfies: 10°≤a3≤13°, the flow guiding effect of the third flow guide channel 430 on the protective gas can be ensured, and the influence of the third flow guide channel 430 on the movement of the welding slag can be reduced.

[0046] With continued reference to Figure 3 As shown in FIG. 6, the caliber of the gas outlet 200 is D1, which satisfies: 7mm≤D1≤9mm.

[0047] Specifically, in the embodiment, D1 can be 7mm, 7.5mm, 8mm, 8.5mm, 9mm, and the like.

[0048] In the embodiment, if the diameter D1 of the gas outlet 200 is less than 7 mm, the diameter of the gas outlet 200 is too small, which increases the probability of slag blocking the gas outlet 200, and affects the laser welding effect. If the diameter D1 of the gas outlet 200 is greater than 9 mm, the diameter of the gas outlet 200 is too large, which increases the probability of the welding slag entering the nozzle through the gas outlet 200, and increases the probability of the welding slag with large particle size entering the nozzle, thereby affecting the service life of the nozzle. When the diameter of the gas outlet 200 satisfies 7 mm≤D1≤9 mm, the probability of slag blocking the gas outlet 200 is reduced, the influence on the laser welding is reduced, and the probability of the welding slag with large particle size entering the nozzle is reduced, thereby reducing the influence on the service life of the nozzle.

[0049] With reference back to Figure 3 As shown in the figure, the diameter of the second flow passage 320 is D2, which satisfies 11 mm≤D2≤13 mm.

[0050] Specifically, in the embodiment, D2 can be 11 mm, 11.5 mm, 12 mm, 12.5 mm, 13 mm, etc.

[0051] In the embodiment, if the diameter D2 of the second flow passage 320 is less than 11 mm or greater than 13 mm, the diameter of the second flow passage 320 cannot meet the taper requirement of the third flow guide passage 430, which reduces the flow guide effect of the protective gas, and may cause steps between the second flow passage 320 and the third flow guide passage 430, which affects the movement of the slag. When the diameter D2 of the second flow passage 320 satisfies 11 mm≤D2≤13 mm, the diameter of the second flow passage 320 can meet the taper requirement of the third flow guide passage 430, which improves the flow guide effect of the protective gas, avoids steps between the second flow passage 320 and the third flow guide passage 430, and reduces the influence on the movement of the slag.

[0052] With reference back to Figure 3 As shown in the figure, the diameter of the first flow passage 310 is D3, which satisfies 16.5 mm≤D3≤18.5 mm.

[0053] Specifically, in the embodiment, D3 can be 16.5 mm, 17 mm, 17.5 mm, 18 mm, 18.5 mm, etc.

[0054] In the embodiment, if the diameter D3 of the first flow passage 310 is less than 16.5 mm or greater than 18.5 mm, the diameter of the first flow passage 310 cannot meet the taper requirement of the second flow guide passage 420, thereby reducing the flow guiding effect of the protective gas and possibly causing a step between the first flow passage 310 and the second flow guide passage 420, affecting the movement of the slag. When the diameter D3 of the first flow passage 310 satisfies 16.5 mm≤D2≤18.5 mm, the diameter of the first flow passage 310 can meet the taper requirement of the second flow guide passage 420, thereby improving the flow guiding effect of the protective gas, avoiding a step between the first flow passage 310 and the second flow guide passage 420, and reducing the impact on the movement of the slag.

[0055] With reference back to Figure 3 As shown in the figure, the length of the nozzle along the axial direction x is L1, which satisfies 45 mm≤L1≤60 mm.

[0056] Specifically, in the embodiment, L1 can be 45 mm, 50 mm, 55 mm, 60 mm, etc.

[0057] In the embodiment, if the length L1 of the nozzle along the axial direction x is less than 45 mm, the length of the nozzle along the axial direction x is too short, which can easily cause the slag to fly directly to the laser welding head during laser welding, thereby damaging the laser welding head. If the length L1 of the nozzle along the axial direction x is greater than 60 mm, the length of the nozzle along the axial direction x is too long, which can easily damage the nozzle during laser welding, thereby increasing the maintenance cost. When the length of the nozzle along the axial direction x satisfies 45 mm≤L1≤60 mm, the protection of the laser welding head can be improved, and the damage rate of the nozzle can be reduced, thereby reducing the maintenance cost.

[0058] With reference back to Figure 3 As shown in the figure, the length of the first flow passage 310 along the axial direction x is L2, which satisfies 7 mm≤L2≤10 mm.

[0059] Specifically, in the embodiment, L2 can be 7 mm, 8 mm, 9 mm, 10 mm, etc.

[0060] In the embodiment, if the length L2 of the first flow passage 310 along the axial direction x satisfies L2 < 7 mm or L2 > 10 mm, the length of the first flow passage 310 along the axial direction x cannot satisfy the length and taper requirements of the first flow guide passage 410 and the second flow guide passage 420, and the total length of the nozzle along the axial direction x is too long or too short. When the length L2 of the first flow passage 310 along the axial direction x satisfies 7 mm ≤ L2 ≤ 10 mm, the length and taper requirements of the first flow guide passage 410 and the second flow guide passage 420 can be met, and the total length of the nozzle along the axial direction x is within the preset length range.

[0061] With continued reference to Figure 3 As shown in FIG. 6, the length of the second flow passage 320 along the axial direction x is L3, which satisfies 15 mm ≤ L3 ≤ 19 mm.

[0062] Specifically, in the embodiment, L3 can be 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, etc.

[0063] In the embodiment, if the length L3 of the second flow passage 320 along the axial direction x satisfies L3 < 15 mm or L3 > 19 mm, the length of the second flow passage 320 along the axial direction x cannot satisfy the length and taper requirements of the second flow guide passage 420 and the third flow guide passage 430, and the total length of the nozzle along the axial direction x is too long or too short. When the length L3 of the second flow passage 320 along the axial direction x satisfies 15 mm ≤ L3 ≤ 9 mm, the length and taper requirements of the second flow guide passage 420 and the third flow guide passage 430 can be met, and the total length of the nozzle along the axial direction x is within the preset length range.

[0064] With reference to Figure 3 and Figure 1 As shown in FIG. 6, the nozzle includes a nozzle portion 500 and a connecting portion 600. The connecting portion 600 is arranged at one end of the nozzle portion 500 away from the gas outlet 200 along the axial direction x. The outer diameter of the nozzle portion 500 gradually decreases from the gas inlet 100 to the gas outlet 200 along the axial direction x.

[0065] In the embodiment, the connecting portion 600 is used to connect with the main body structure of the laser welding head, so that the nozzle portion 500 is connected on the main body structure of the laser welding head through the connecting portion 600. Since the outer diameter of the nozzle portion 500 gradually decreases from the gas inlet 100 to the gas outlet 200 along the axial direction x, the first flow guide channel 410, the first flow passage 310, the second flow guide channel 420, the second flow passage 320 and the third flow guide channel 430 can gradually decrease in diameter, so that the internal flow passage of the nozzle portion 500 is a tapered flow passage that gradually decreases towards the gas outlet 200. The tapered flow passage can focus the laser beam on a very small point, ensure accurate heating of the welding area, and improve welding precision and quality.

[0066] With reference to the Figure 2 and Figure 1 shown, the nozzle also has a circumferential direction z, and the outer surface of the end of the nozzle portion 500 close to the connecting portion 600 is provided with a plurality of anti-skid grooves 510. The plurality of anti-skid grooves 510 are arranged at intervals along the circumferential direction of the nozzle portion 500, and each anti-skid groove 510 is recessed towards the inside of the nozzle portion 500 along the radial direction y.

[0067] It should be noted that the circumferential direction z is the direction indicated by z in Figure 2 Figure 2 .

[0068] In the embodiment, since the plurality of anti-skid grooves 510 are arranged at intervals along the circumferential direction of the nozzle portion 500, and each anti-skid groove 510 is recessed towards the inside of the nozzle portion 500 along the radial direction y, when the nozzle is disassembled, the plurality of anti-skid grooves 510 can be held to prevent slipping and facilitate disassembly of the nozzle.

[0069] Specifically, in the embodiment, the surface of the connecting portion 600 has external threads.

[0070] In the embodiment, since the surface of the connecting portion 600 has external threads, the connecting portion 600 can be connected with the main body structure of the laser welding head through the threads, so as to facilitate disassembly of the nozzle, and improve the connection stability and sealing performance between the nozzle and the main body structure of the laser welding head.

[0071] The laser welding head of the embodiment of the application comprises the nozzle described above.

[0072] In the laser welding head of the application, the nozzle described above can reduce the adhesion of welding slag in the nozzle, so that the welding quality is high when welding is performed by the laser welding head of the application.

[0073] The laser welding device of the embodiment of the application comprises the laser welding head described above.

[0074] In the laser welding device of the present application, since the welding quality can be improved when welding is performed by the laser welding head described above, the laser welding device of the present application can have high welding quality.

[0075] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0076] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and the person skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A nozzle, characterized in that, Having both axial and radial directions, the nozzle is provided with an air inlet, an air outlet, multiple flow channels, and multiple flow guide channels; The air inlet and the air outlet are respectively opened at both ends of the nozzle along the axial direction. Multiple flow channels and multiple flow guide channels are arranged between the air inlet and the air outlet, and the multiple flow channels and multiple flow guide channels are arranged alternately along the axial direction. Any adjacent flow channels are connected to the flow guide channels. The multiple flow channels and the multiple flow guide channels are coaxially arranged, and the diameter of the connection between any two adjacent flow channels and flow guide channels is the same. The diameter of any flow guide channel gradually decreases from the air inlet to the air outlet along the axial direction.

2. The nozzle according to claim 1, characterized in that, The flow guiding channel includes a first flow guiding channel, a second flow guiding channel, and a third flow guiding channel. The flow passage includes a first flow passage and a second flow passage. The first flow guiding channel, the second flow guiding channel, and the third flow guiding channel are arranged sequentially along the axial direction. The third flow guiding channel is connected to the air outlet, and the first flow guiding channel is connected to the air inlet. The first flow passage is disposed between the second flow guiding channel and the first flow guiding channel, and the second flow passage is disposed between the third flow guiding channel and the second flow guiding channel.

3. The nozzle according to claim 2, characterized in that, The angle between the sidewall of the first flow channel and the axial direction is α1, the angle between the sidewall of the second flow channel and the axial direction is α2, and the angle between the sidewall of the third flow channel and the axial direction is α3, satisfying: 10°≤α1≤13°, 10°≤α2≤13°, 10°≤α3≤13°.

4. The nozzle according to claim 3, characterized in that, The diameter of the air outlet is D1, the diameter of the second flow channel is D2, and the diameter of the first flow channel is D3, satisfying the following conditions: 7mm≤D1≤9mm, 11mm≤D2≤13mm, and 16.5mm≤D3≤18.5mm.

5. The nozzle according to claim 4, characterized in that, The length of the nozzle along the axial direction is L1, which satisfies: 45mm≤L1≤60mm.

6. The nozzle according to claim 2, characterized in that, The nozzle includes a nozzle portion and a connecting portion. The connecting portion is disposed at one end of the nozzle portion away from the air outlet along the axial direction. The outer diameter of the nozzle portion gradually decreases along the axial direction from the air inlet toward the air outlet.

7. The nozzle according to claim 6, characterized in that, The nozzle also has a circumferential direction. The outer surface of the nozzle portion near the end of the connecting portion along the axial direction is provided with a plurality of anti-slip grooves. The plurality of anti-slip grooves are spaced apart along the circumferential direction of the nozzle portion, and each anti-slip groove is recessed toward the interior of the nozzle portion along the radial direction.

8. The nozzle according to claim 6, characterized in that, The surface of the connecting part has external threads.

9. A laser welding head, characterized in that, include: The nozzle as described in any one of claims 1-8.

10. A laser welding apparatus, characterized in that, include: The laser welding head as described in claim 9.

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