Blowing protection device

Abstract

The utility model discloses a blowing protection device. The blowing protection device comprises a base, a main body and a protection piece, the base is provided with a cavity, the body is connected to the base, and the body is provided with an air blowing unit. The protection piece is connected to the body and provided with a protection unit, and the protection unit is connected with the air blowing unit. Wherein the protection unit is provided with an air inlet, and the air blowing unit comprises an air inlet channel, an air outlet channel and an air outlet. The air inlet channel is in fluid connection with the air inlet, the air outlet channel is in fluid connection with the air inlet channel, the diameter of the air outlet channel is gradually reduced from the air inlet direction to the air outlet direction, and the air outlet channel comprises a plurality of sub-flow channels which divide the air outlet channel. The gas outlet is in fluid connection with the gas outlet channel, and protective gas is blown in from the gas inlet, flows into the sub-flow channels of the gas outlet channel through the gas inlet channel and is blown out from the gas outlet to the cavity. The blowing protection device can effectively solve the problem that the shielding gas is discharged unevenly.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser welding field, concretely relates to blowing protection device. BACKGROUND

[0002] In the laser welding process, the use of protective gas is crucial, and the protective gas is used to prevent weld oxidation and improve welding quality. Common protective gases include nitrogen and argon, etc. The main role of these gases is to form a protective barrier, isolate molten metal from the surrounding environment, prevent oxidation and contamination, and ensure the cleanliness of the welding process and the strength of the weld.

[0003] Taking a nitrogen blowing protection device as an example, the existing protection device has some problems in structure design, which leads to unsatisfactory nitrogen protection effect and uneven nitrogen protection, which may cause the steel shell weld to appear yellow and black. This phenomenon is usually caused by oxidation of the metal surface during welding, insufficient flow of protective gas, or insufficient purity. Oxidation reactions occur at high temperatures, forming black or gray oxides such as iron trioxide and iron tetraoxide. These oxides not only affect corrosion resistance and mechanical properties, but also affect appearance.

[0004] In related technologies, in order to improve the uniformity of protective gas coverage, a narrow-top wide-bottom channel structure is usually provided on the protection device, and the protective gas is blown in from the wider end of the channel and blown out from the narrower end. However, since the inside of the channel is a whole space environment, the gas pressure blown out from the narrower end may be related to the position of the gas inlet, for example, the gas pressure at the position close to the gas inlet is greater than that at the position far from the gas inlet. This will cause uneven gas pressure at the gas outlet, resulting in uneven nitrogen protection, oxidation of the weld, and yellow and black appearance, affecting the welding quality. SUMMARY

[0005] The utility model aims at solving one of the technical problems existing in the prior art. To this end, the utility model provides a blowing protection device, which can effectively solve the problem of uneven protective gas outlet.

[0006] The blowing protection device according to the utility model embodiment is used for blowing protective gas during laser welding, and comprises:

[0007] A base, the base has a cavity;

[0008] A main body connected to the base, the main body has a gas blowing unit;

[0009] A protection piece connected to the main body, the protection piece has a protection unit, and the protection unit is connected with the gas blowing unit;

[0010] The protection unit is provided with an air inlet, and the air blowing unit comprises:

[0011] An air inlet channel is in fluid connection with the air inlet;

[0012] An air outlet channel is in fluid connection with the air inlet channel, the diameter of the air outlet channel gradually decreases from the air inlet direction to the air outlet direction, and the air outlet channel comprises a plurality of sub-flow channels, and the plurality of sub-flow channels divide the air outlet channel;

[0013] An air outlet is in fluid connection with the air outlet channel, the protection gas is blown in from the air inlet, flows into each sub-flow channel of the air outlet channel through the air inlet channel, and is blown out from the air outlet to the cavity.

[0014] The air blowing protection device has at least the following beneficial effects: the problem of non-uniform air outlet of the protection gas can be effectively solved. In the present application, the diameter of the air outlet channel gradually decreases from top to bottom (i.e., from the air inlet direction to the air outlet direction), forming a conical shape that is wide at the top and narrow at the bottom, thereby increasing the gas pressure when the protection gas is blown out of the air outlet, which helps to blow out uniform protection gas. Further, the air outlet channel of the present application further comprises a plurality of sub-flow channels, and the plurality of sub-flow channels divide the air outlet channel. When the protection gas is blown into the air inlet channel from the air inlet, the protection gas in the air inlet channel is uniformly blown into each sub-flow channel, the airflow is divided into a plurality of sub-flow channels, and the protection gas is uniformly distributed.

[0015] Compared with the air outlet channel of the related art which has a whole cavity inside, the air outlet channel of the present application is provided with a plurality of sub-flow channels, the sub-flow channels divide the internal space of the air outlet channel, and further divide the blown-in protection gas, so that the protection gas is more uniformly outgassed.

[0016] According to some embodiments of the present application, the sub-flow channel comprises an air inlet end and an air outlet end, and the air inlet direction of the air inlet end intersects the air outlet direction of the air outlet end.

[0017] According to some embodiments of the present application, the angle between the air outlet direction of the air outlet end and the central axis of the air outlet channel is R, and 30°≤R≤60°

[0018] According to some embodiments of the present application, the width of the sub-flow channel gradually decreases from the air inlet end to the air outlet end.

[0019] According to some embodiments of the present application, the sub-flow channel has a rib, the protection unit further comprises a light path channel for laser passing, the top surface of the rib abuts against the outer surface of the light path channel, and the end of the rib close to the air inlet channel protrudes from the bottom surface of the air inlet channel.

[0020] According to some embodiments of the present application, the air inlet is provided with multiple air inlets, and the air inlet channel comprises an extension end, and each air inlet is communicated with one extension end.

[0021] According to some embodiments of the present application, the air inlet is provided with multiple air inlets, and the air inlet channel comprises an extension end, and each air inlet is communicated with one extension end.

[0022] According to some embodiments of the present application, the number of sub-flow channels is N, and 20≤N≤24.

[0023] According to some embodiments of the present application, the base is made of spring rubber.

[0024] According to some embodiments of the present application, the base is made of spring rubber.

[0025] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] The present application will be further described below in combination with the drawings and embodiments, wherein:

[0027] Figure 1 It is a schematic view of the air blowing protection device of the present application;

[0028] Figure 2 It is a top view of the air blowing protection device of the present application;

[0029] Figure 3 It is Figure 2 the sectional view of A-A;

[0030] Figure 4 It is Figure 3 the enlarged view of B;

[0031] Figure 5 It is a top view of the air blowing protection device of the present application without showing the protection member.

[0032] REFERENCE NUMERALS:

[0033] Base 10; chamber 101; main body 20; air blowing unit 200; air inlet channel 210; extension end 211; air outlet channel 220; sub-flow channel 221; air inlet end 221a; air outlet end 221b; rib 222; air outlet 230; protection member 30; protection unit 300; air inlet 310; light path channel 320; silica gel pad 40; welded object 50. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described below in detail, examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0035] In the description of the present application, it is understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0036] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0037] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application according to the specific content of the technical scheme.

[0038] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0039] In the laser welding operation, the use of protective gas is crucial to prevent weld oxidation and improve welding quality. Common protective gases such as nitrogen and argon form a barrier to isolate molten metal from the external environment during welding, preventing oxidation and contamination of the weld, ensuring the cleanliness of the welding process and the strength of the weld.

[0040] However, current protective devices have structural design flaws that lead to uneven protective gas blowing, resulting in poor and uneven protection. This can cause yellowing or blackening of the weld seams in the steel casing. This is usually caused by oxidation of the metal surface during welding or insufficient flow or purity of the protective gas. Oxidation reactions at high temperatures form oxides such as ferric oxide and magnetite, which affect the corrosion resistance and mechanical properties of the material, and also damage the battery's appearance.

[0041] In related technologies, to improve the uniform coverage of the shielding gas, existing structures design the shielding device's channel to be narrower at the top and wider at the bottom, allowing the shielding gas to enter from the wider end and exit from the narrower end. However, since the inside of the channel is a single, continuous space, the gas pressure exiting from the narrower end may be affected by the inlet's position, resulting in higher pressure near the inlet compared to areas further away. This pressure unevenness can lead to uneven distribution of the shielding gas, causing weld oxidation, resulting in yellowing or blackening, and affecting weld quality.

[0042] Therefore, it is necessary to design a blowing protection device that can make the protective gas output more uniform.

[0043] Based on the above problems, this application proposes a battery that aims to solve the problems existing in the related technologies to a certain extent.

[0044] Reference Figures 1 to 5 Mainly refer to Figure 1 According to an embodiment of the present invention, a gas blowing protection device is used to blow protective gas during laser welding, comprising a base 10, a main body 20, and a protective element 30. The base 10 has a chamber 101, and the main body 20 is connected to the base 10, having a gas blowing unit 200. The protective element 30 is connected to the main body 20 and has a protective unit 300, which is connected to the gas blowing unit 200. The protective unit 300 is provided with an air inlet 310, and the gas blowing unit 200 includes an air inlet channel 210, an air outlet channel 220, and an air outlet 230. The air inlet channel 210 is fluidly connected to the air inlet 310, and the air outlet channel 220 is fluidly connected to the air inlet channel 210. The diameter of the air outlet channel 220 gradually decreases from the air inlet direction to the air outlet direction, and the air outlet channel 220 includes multiple sub-channels 221, which divide the air outlet channel 220. The air outlet 230 is fluidly connected to the air outlet channel 220. Protective gas is blown in from the air inlet 310, flows into each sub-channel 221 of the air outlet channel 220 through the air inlet channel 210, and is blown out from the air outlet 230 to the chamber 101.

[0045] The air-blowing protection device according to the embodiments of this utility model has at least the following beneficial effects: it can effectively solve the problem of uneven protective gas output.

[0046] In this application, the diameter of the exhaust channel 220 gradually decreases from top to bottom (i.e., from the air inlet direction to the air outlet direction), forming a conical shape that is wider at the top and narrower at the bottom. This increases the gas pressure when the protective gas is blown out from the exhaust port 230, which helps to blow out a uniform protective gas. Furthermore, the exhaust channel 220 of this application also includes multiple sub-channels 221, which divide the exhaust channel 220. When the protective gas is blown into the intake channel 210 from the air inlet 310, the protective gas in the intake channel 210 is evenly blown into each sub-channel 221, dividing the airflow from the intake channel 210 into multiple sub-channels 221, so that the protective gas is evenly distributed.

[0047] Compared with the air outlet channel 220 of the related technology, which has an integral chamber 101 inside, the air outlet channel 220 of this application is provided with multiple sub-channels 221. The sub-channels 221 divide the internal space of the air outlet channel 220, thereby dividing the blown protective gas, so as to make the protective gas outlet more uniform.

[0048] Furthermore, in the air-blowing protection device of this application, the base 10 can have multiple chambers 101, the main body 20 can have multiple air-blowing units 200, and the protective component 30 can also have multiple protective units 300. The number of chambers 101 in the base 10, the number of air-blowing units 200 in the main body 20, and the number of protective units 300 in the protective component 30 are the same. That is, the chambers 101, air-blowing units 200, and protective units 300 correspond one-to-one to form an air-blowing protection structure. The number of air-blowing protection structures can be specifically designed according to actual usage needs, and can be one, two, three, or four, etc. In this application, four are used as an example for explanation.

[0049] Furthermore, referring to Figures 2 to 4According to some embodiments of this utility model, the sub-channel 221 includes an inlet end 221a and an outlet end 221b, with the inlet direction of the inlet end 221a intersecting the outlet direction of the outlet end 221b. In this application, the end of the sub-channel 221 near the inlet channel 210 is the inlet end 221a, and the end near the outlet 230 is the outlet end 221b. The gas flow direction of the inlet end 221a intersects the gas flow direction of the outlet end 221b, that is, in the sub-channel 221, the gas inlet direction and the gas outlet direction are different. For example, by setting the sub-channel 221 in a spiral shape, the gas changes direction within the sub-channel 221, forming a spiral airflow. This increases the flow rate and pressure of the protective gas, resulting in the gas having a higher pressure and flow rate than the gas from the inlet 221a when it is blown out from the outlet 221b (outlet 230) via the spiral sub-channel 221. The increase in gas pressure and flow rate further leads to the uniformity of the protective gas output, which is beneficial for forming a uniform protective gas environment in the chamber 101. This effectively avoids the phenomenon of yellowing or blackening of the weld caused by uneven protective gas, thereby improving weld quality and welding precision.

[0050] Furthermore, according to some embodiments of this utility model, the angle between the outlet direction of the protective gas at the outlet end 221b and the central axis of the outlet channel 220 is R, where 30°≤R≤60°. As mentioned above, setting the sub-channel 221 in a spiral shape allows the gas flow direction at the inlet end 221a to be different from that at the outlet end 221b, increasing the gas pressure and gas flow rate at the outlet end 221b, thereby increasing the uniformity of gas output. Further, in some embodiments, the outlet direction of the gas at the outlet 230 is set at an angle to the weld, meaning the gas outlet direction is not perpendicular to the axis of the workpiece 50, but at a certain angle. In this way, when the protective gas is blown to the weld, the inclined blowing can better cover the molten pool area, especially when the welding speed is high or the molten pool is large. The inclined blowing can provide more uniform protection, reducing oxidation and porosity. Furthermore, oblique air blowing helps to disperse the plasma generated by laser welding, which absorbs and scatters the laser, affecting the energy transmission of the laser and the stability of the welding process. Therefore, compared with blowing the shielding gas directly onto the weld, oblique air blowing can further improve the uniformity of the shielding gas at the weld, thereby improving the welding quality.

[0051] Furthermore, according to some embodiments of this utility model, the width of the sub-channel 221 gradually decreases from the inlet end 221a to the outlet end 221b. To make the gas output from the outlet 230 more uniform, in some embodiments of this application, the gas pressure at the outlet 230 can also be increased by changing the width of the sub-channel 221. Specifically, the width of the sub-channel 221 can be set to become progressively smaller from the inlet end 221a to the outlet end 221b. When gas enters a narrower channel from a wider channel, the gas velocity increases. This acceleration promotes more uniform and tighter adhesion of the gas to the weld, thus providing more uniform protection for the weld. In addition, the increased gas velocity also helps to disperse the plasma generated during welding, reducing the shielding effect on laser energy, improving the effective utilization rate of the laser, improving welding quality, reducing porosity and spatter, and resulting in a more uniform and aesthetically pleasing weld formation.

[0052] Furthermore, referring to Figures 2 to 4 According to some embodiments of this utility model, the sub-channel 221 has ribs 222, and the protection unit 300 further includes an optical path channel 320 for laser transmission. The top surface of the rib 222 abuts against the outer surface of the optical path channel 320, and the end of the rib 222 near the air inlet channel 210 protrudes from the bottom surface of the air inlet channel 210. Specifically, the abutment of the ribs 222 of the sub-channel 221 against the outer surface of the optical path channel 320 enables the air outlet channel 220 to be divided into several small cavities by each sub-channel 221. When the gas enters the air outlet channel 220 from the air inlet channel 210, it is separated by each rib 222 and the outer surface of the optical path channel 320, so that the air enters each sub-channel 221 evenly, thereby making the air outlet 230 more uniform. On the other hand, the ribs 222 of the sub-channel 221 and the outer surface of the optical path channel 320 may not be completely tightly fitted, but have a small gap in the middle, as long as it can ensure that most of the gas is blown into each sub-channel 221 and is evenly divided by each sub-channel 221.

[0053] The end of the rib 222 near the intake channel 210 protrudes from the bottom surface of the intake channel 210. The advantage of this design is that when the gas in the intake channel 210 is blown into each sub-channel 221 from the intake channel 210, the rib 222 protruding from the bottom surface of the intake channel 210 can help the gas in the intake channel 210 to be divided more evenly and quickly, so as to further increase the gas pressure and flow rate, thereby making the gas output from the outlet 230 more uniform.

[0054] Furthermore, referring to Figure 5According to some embodiments of this utility model, multiple air intake channels 210 are provided, which are interconnected and surround the air outlet channel 220. Multiple air intake channels 210 can be provided; in this application, four air intake channels 210 are schematically provided, which are interconnected and surround the outer periphery of the air outlet channel 220. Therefore, compared with the related technologies that only allow air intake from one or both sides, the air intake method of this application, which allows air to enter the entire circumference of the air outlet channel 220, increases the air intake range, making the gas blown from the air intake channel 210 into each sub-channel 221 of the air outlet channel 220 more uniform, thereby improving the uniformity of the gas blown out from each sub-channel 221.

[0055] Furthermore, it is understandable that, depending on different actual needs, the intake channels 210 can also be set with three, five, six, etc., as long as each intake channel 210 is connected and surrounds the outer periphery of the exhaust channel 220 to ensure uniform air intake.

[0056] According to some embodiments of this utility model, multiple air inlets 310 are provided, and air intake channels 210 include extension ends 211, with each air inlet 310 connected to one extension end 211. To facilitate air intake, the number of air inlets 310 can be set according to the number of air intake channels 210. In this application, the number of air inlets 310 is set to four, with each of the four air inlets 310 connected to one of the four air intake channels 210. The air inlets 310 are connected to an external air source for air supply. Specifically, the air intake channel 210 of this application also includes an extension end 211, which protrudes from the air intake channel body that is arranged in a ring. The air intake port 310 is connected to the extension end 211 to further prevent the air intake port 310 from directly blowing air into the air intake channel 210, which would cause uneven gas flow in each sub-channel 221 (for example, the gas flow rate and pressure in the sub-channel 221 near the air intake port 310 are too high due to direct connection with the air intake port 310, while the gas flow rate and pressure in the sub-channel 221 far from the air intake port 310 are too low, resulting in uneven gas flow in each sub-channel 221), thereby causing uneven gas flow in the air outlet 230.

[0057] Therefore, this application connects the air inlet 310 to the extension end 211 of the air inlet channel 210 for blowing air. The gas entering from the air inlet 310 is not directly blown into each sub-channel 221. Instead, the gas blown into each air inlet 310 is first mixed through the air inlet channel 210 to form a roughly equal gas pressure and gas flow rate in the air inlet channel 210. Then, it is evenly divided and enters each sub-channel 221. This makes the gas blown out from the air outlet 230 (the air outlet end 221b of each sub-channel 221) more uniform, thereby effectively solving the problem of yellowing and blackening of the weld due to oxidation and improving the welding quality.

[0058] According to some embodiments of this utility model, the number of sub-channels 221 is N, where 20 ≤ N ≤ 24. The number of sub-channels 221 can be specifically set according to actual needs and the diameter of the outlet channel 220. In this application, for example, the number of sub-channels 221 can be 20 to 24, such as 20, 21, 22, 23, or 24. This ensures that the number of sub-channels 221 is not too large, resulting in a narrow internal space for gas passage, while also preventing the number of sub-channels 221 from being too small, which would result in the gas not being evenly divided by each sub-channel 221. Therefore, by setting the number of sub-channels 221 between 20 and 24, this application enables each sub-channel 221 to evenly divide the gas in the inlet channel 210, thereby making the gas output from the outlet 230 more uniform.

[0059] According to some embodiments of this utility model, the base 10 is made of spring rubber. (See reference...) Figure 3 The workpiece 50 is housed in the cavity 101 of the base 10. During the laser welding process, the use of spring glue (thermosetting polyurethane elastomer) as the base 10 can effectively isolate the welding area, reduce oxidation and spatter, and improve welding accuracy. At the same time, due to the high elasticity and tensile strength of the spring glue, the heat-affected zone can be reduced and welding deformation can be decreased.

[0060] According to some embodiments of this utility model, a silicone pad 40 is also included, which is disposed on the side of the base 10 away from the main body 20. The silicone pad 40 is used to contact the pressing surface during welding, providing good cushioning and preventing air leakage. Specifically, during laser welding, the welding area generates high temperature and pressure. The silicone pad 40 can absorb some of the pressure and impact, protecting the contact surface from mechanical stress and reducing deformation or damage that may occur during welding. Furthermore, the silicone pad 40 has high sealing performance, effectively isolating air and water vapor, preventing air and water vapor from entering the welding area, ensuring the sealing of the welding area (chamber 101), thereby preventing protective gas leakage and improving welding quality.

[0061] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A protective gas blowing device for blowing protective gas during laser welding, characterized in that, include: A base having a cavity; The main body is connected to the base and has an air blowing unit; A protective component is connected to the main body, and the protective component has a protective unit connected to the air blowing unit; The protection unit is provided with an air inlet, and the air blowing unit includes: An air intake passage, which is fluidly connected to the air intake port; An exhaust channel is fluidly connected to the intake channel. The diameter of the exhaust channel gradually decreases from the intake direction to the exhaust direction. The exhaust channel includes multiple sub-channels, which divide the exhaust channel. An air outlet is fluidly connected to the air outlet channel. The protective gas is blown in from the air inlet, flows into each of the sub-channels of the air outlet channel via the air inlet channel, and is blown out from the air outlet to the chamber.

2. The air-blowing protection device according to claim 1, characterized in that, The sub-channel includes an air inlet and an air outlet, with the air inlet direction intersecting the air outlet direction.

3. The air blowing protection device according to claim 2, characterized in that, The angle between the outlet direction of the protective gas at the outlet end and the central axis of the outlet channel is R, where 30°≤R≤60°.

4. The air-blowing protection device according to claim 2, characterized in that, The width of the sub-channel gradually decreases from the air inlet end to the air outlet end.

5. The air-blowing protection device according to claim 1, characterized in that, The sub-channel has ribs, and the protection unit further includes an optical path channel for laser transmission. The top surface of the rib abuts against the outer surface of the optical path channel, and one end of the rib near the air intake channel protrudes from the bottom surface of the air intake channel.

6. The air blowing protection device according to claim 1, characterized in that, The air intake channel is provided in multiple ways, and the multiple air intake channels are interconnected and surround the air outlet channel.

7. The air-blowing protection device according to claim 6, characterized in that, The air inlet is provided with multiple air inlets, and the air inlet channel includes an extension end, with each air inlet connected to one of the extension ends.

8. The air blowing protection device according to claim 1, characterized in that, The number of sub-channels is N, where 20 ≤ N ≤ 24.

9. The air blowing protection device according to claim 1, characterized in that, The base is made of spring rubber.

10. The air-blowing protection device according to claim 1, characterized in that, It also includes a silicone pad disposed on the side of the base away from the main body.

Images