A nitrogen generator applied to a laser welding device

Abstract

The application relates to the technical field of laser welding equipment, and particularly discloses a nitrogen generator applied to laser welding equipment, which comprises a nitrogen generator box body and a pressure reducing valve arranged at one side of the nitrogen generator box body; two molecular sieve tanks, two buffer tanks and a recovery frame are assembled in the nitrogen generator box body, and the recovery frame is connected with the inside of a welding head of a handheld laser welding device and is used for recovering waste heat of the welding head. The waste heat exchange medium of the handheld laser welding head is introduced through a heat conduction input pipe, heat conduction fins extending into an air flow channel are matched, and high-efficiency heat exchange is realized; a separation flow distribution plate in the molecular sieve tank divides an adsorption area into two sections, different molecular sieves with different performances are filled in the two sections respectively, step-by-step adsorption of coarse purification of water vapor, carbon dioxide and other impurities and nitrogen-oxygen separation is realized, the separation flow distribution plate is matched with an air inlet flow distribution plate, airflow can be multi-stage distributed, full-bed adsorption of the adsorbent is ensured, and the utilization rate of the adsorbent and the purity of nitrogen are improved.

Description

Technical Field

[0001] This invention relates to the field of laser welding equipment technology, specifically to a nitrogen generator used in laser welding equipment. Background Technology

[0002] In laser welding equipment, the nitrogen generator is a crucial component that provides high-purity nitrogen gas to protect the welding area, prevent weld oxidation, and improve weld quality. Handheld laser welding equipment, due to its flexible operation and high welding precision, is widely used in mobile work scenarios such as hardware processing, automotive repair, and pipeline construction. During the welding process, a continuous supply of high-purity nitrogen gas is required to isolate the weld from air, prevent weld oxidation, and improve weld quality. As the core equipment for nitrogen supply, the performance of the nitrogen generator directly determines the stability and reliability of the welding operation.

[0003] Existing nitrogen generation mechanisms for handheld laser welding equipment lack continuous nitrogen supply. Most equipment uses a single molecular sieve tank and buffer tank structure, which cannot synchronize the adsorption and regeneration processes, easily leading to gas interruption during welding and resulting in weld defects. Furthermore, the molecular sieve adsorption efficiency is low, and air entering the molecular sieve tank at low temperatures can easily cause adsorbent activity attenuation. Uneven airflow distribution can also easily form local channeling, resulting in low adsorbent utilization. In addition, there is severe molecular sieve wear. The airflow impact generated during equipment start-up and shutdown, as well as vibrations during movement, can easily loosen and pulverize the molecular sieve particles, requiring frequent replacement of the entire unit, resulting in high maintenance costs. Summary of the Invention

[0004] To address the above issues and overcome the shortcomings of existing technologies, this invention provides a nitrogen generator for laser welding equipment. It comprises two molecular sieve tanks and two buffer tanks, each forming an independent nitrogen generation unit. These units work alternately with an electromagnetic control valve within the gas delivery pipe. While one unit performs adsorption nitrogen generation, the other simultaneously completes its regeneration process. The generated nitrogen is then stably delivered to the buffer tanks for storage via a gas connection, ensuring a continuous and uninterrupted supply of nitrogen to the welding torch. This avoids the gas interruption problems caused by regeneration in traditional single-unit structures, guaranteeing the continuity of welding operations. The coordinated design of the buffer tanks and pressure reducing valves first buffers the output nitrogen pressure before precisely controlling the pressure to the range required for welding, effectively mitigating the impact of pressure fluctuations on weld quality.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: a nitrogen generator for laser welding equipment, comprising a nitrogen generator housing and a pressure reducing valve disposed on one side of the nitrogen generator housing; the nitrogen generator housing is equipped with two molecular sieve tanks, two buffer tanks, and a recovery rack, and the recovery rack is connected to the inside of the welding head of the handheld laser welding equipment for recovering waste heat from the welding head; both molecular sieve tanks have an air outlet at their tops, and the two buffer tanks have an air inlet and a gas guide at their sides, respectively. One molecular sieve tank and one buffer tank correspond to form an independent nitrogen generation structure. In each group, the air outlet of the molecular sieve tank is connected to the air inlet of the buffer tank through a gas guide pipe, and the gas guide of the buffer tank is connected to the pressure reducing valve through a gas guide pipe; a recovery pipe is fixed inside the recovery rack, and an air flow channel and a heat conduction channel are provided inside the recovery pipe. The inner wall of the heat conduction channel is provided with heat conduction fins extending into the air flow channel; an air inlet duct is connected to the bottom of the molecular sieve tank, and one end of the gas guide pipe in the recovery rack is connected to the air inlet duct, and the other end is connected to the air flow channel.

[0006] Furthermore, one end of the recovery pipe is closed and the other end extends to the outside of the recovery rack; an air supply pipe and a heat conduction input pipe are respectively connected to the extended end of the recovery pipe, and a heat conduction output pipe is connected to the closed end; the air supply pipe is connected to the air flow channel, and both the heat conduction input pipe and the heat conduction output pipe are connected to the heat conduction flow channel to form a heat exchange medium circulation loop.

[0007] Furthermore, a conical flow guide is fixed at the bottom of the molecular sieve tank, the bottom end of which is connected to the air inlet duct, and the top is provided with several flow guide holes that communicate with the inside of the air inlet duct; an air inlet flow equalization plate is also fixed at the bottom of the molecular sieve tank, and an airflow diffusion gap is reserved between the air inlet flow equalization plate and the conical flow guide.

[0008] Furthermore, a flow equalization plate is fixed in the middle of the molecular sieve tank. Both the flow equalization plate and the air inlet flow equalization plate are provided with several flow equalization holes. Each flow equalization hole is embedded with a silicone valve core that can deform with air pressure. The flow equalization hole is an inverted conical through hole.

[0009] Furthermore, the bottom of the dividing flow equalization plate is provided with several backflush holes, and the inside is provided with a backflush channel communicating with the backflush holes; a backflush interface is installed on one side of the molecular sieve tank, and one end of the backflush interface is connected to the inside of the backflush channel for connecting the regeneration backflush gas.

[0010] Furthermore, molecular sieve clamping assemblies are arranged at both the top and bottom of the molecular sieve tank. The clamping assembly includes a pressing frame, a pressing metal mesh, and a filter cloth. A fixing rod is fixed inside the molecular sieve tank by a connecting frame. The pressing frame is movably arranged inside the tank and cooperates with the fixing rod. The pressing metal mesh is fixed inside the pressing frame, and the filter cloth is fixed on the opposite side of the pressing metal mesh. Both the pressing metal mesh and the filter cloth are slidably connected to the fixing rod.

[0011] Furthermore, the space between the lower filter cloth and the dividing flow equalization plate inside the molecular sieve tank is filled with a medium- or microporous molecular sieve to preferentially adsorb large molecular impurities such as water vapor and carbon dioxide; the space between the upper filter cloth and the dividing flow equalization plate is filled with a microporous molecular sieve to achieve nitrogen and oxygen separation.

[0012] Furthermore, four clamping columns are fixed inside the molecular sieve tank at both the top and bottom. Each clamping column has a connecting column movably connected to one end. The corresponding connecting columns are fixedly connected to the inside perimeter of the upper and lower pressing frames. A servo electric cylinder is fixed inside the clamping column. A sliding block is fixed to the end of the drive shaft of the servo electric cylinder. A sliding rod is fixed to one side of the sliding block. The top of the sliding rod slides in cooperation with the inside of the connecting column.

[0013] Furthermore, a compression spring is fitted onto the surface of the slide rod. The top end of the compression spring is fixedly connected to the bottom of the connecting column, and the bottom end is fixedly connected to the top of the sliding block, forming an elastic pre-tightening structure.

[0014] Furthermore, both of the aforementioned gas guide pipes are equipped with electromagnetic control valves to control the gas inlet flow of the corresponding molecular sieve tanks; the connection between the gas inlet duct and the gas guide pipe is sealed with a sealing flange.

[0015] Furthermore, the nitrogen generator is equipped with a high-pressure resistant gas pipeline with a length of 1.5-5m. One end of the gas pipeline is sealed to the output end of the pressure reducing valve, and the other end is equipped with a standardized quick-connect connector adapted to the protective gas inlet of the handheld laser welding equipment. This quick-connect connector can be quickly and sealed to the protective gas outlet of the handheld laser welding equipment. The nitrogen generator housing is equipped with a control interface that is linked to the start and stop signals of the handheld laser welding equipment, synchronously responding to the welding start and stop commands of the handheld laser welding equipment, realizing the automatic opening and closing of nitrogen supply, and adapting to various operating modes of the handheld laser welding equipment.

[0016] The beneficial effects achieved by the present invention using the above structure are as follows: 1. The nitrogen generator housing provides a compact integrated installation platform for core components such as molecular sieve tanks, buffer tanks, and recovery racks, effectively reducing the equipment size and adapting to the mobile operation requirements of handheld laser welding equipment. The two molecular sieve tanks and two buffer tanks constitute independent nitrogen generation units, which work alternately with the electromagnetic control valve in the gas delivery pipe. When one unit is adsorbing and generating nitrogen, the other unit completes the regeneration process simultaneously. The generated nitrogen is then stably delivered to the buffer tank for storage through the gas connection, ensuring a continuous and uninterrupted supply of nitrogen to the welding torch head. This avoids the gas interruption problem caused by regeneration in traditional single-unit structures and ensures the continuity of welding operations. The coordinated design of the buffer tank and pressure reducing valve can first buffer the output nitrogen pressure and then accurately regulate the pressure to the range required for welding, effectively avoiding the impact of pressure fluctuations on weld quality.

[0017] 2. By adopting a dual-channel structure for the recovery pipe inside the recovery rack, the air channel and the heat-conducting channel are independent of each other. The waste heat exchange medium from the handheld laser welding head is introduced through the heat-conducting input pipe, and the heat-conducting fins extending into the air channel achieve efficient heat exchange, preheating the air entering the molecular sieve tank. This avoids the attenuation of molecular sieve adsorption activity caused by low-temperature air, and makes full use of the waste heat resources during the welding process, eliminating the need for additional heating devices and reducing the overall energy consumption of the equipment. The partitioning flow equalization plate inside the molecular sieve tank divides the adsorption area into upper and lower sections, which are filled with molecular sieves of different properties. This achieves step-by-step adsorption of impurities such as water vapor and carbon dioxide and fine separation of nitrogen and oxygen. At the same time, the cooperation between the partitioning flow equalization plate and the air inlet flow equalization plate can distribute the airflow in multiple stages, ensuring uniform adsorption of the adsorbent throughout the entire bed, improving the adsorbent utilization rate and nitrogen purity.

[0018] 3. The conical flow guide at the bottom of the molecular sieve tank, in conjunction with the inlet flow equalization plate, enables preliminary diffusion and uniform distribution of the incoming air, reducing the direct impact of the airflow on the molecular sieve layer. The silicone valve core embedded in the flow equalization plate automatically adjusts its opening according to changes in air pressure, stabilizing the airflow speed and further reducing the impact of sudden airflow changes on the adsorbent. The independent molecular sieve clamping components for the upper and lower sections achieve seamless coverage of the molecular sieve layer through the clamping metal mesh and filter cloth. The servo electric cylinder and compression spring in the clamping column provide a continuously adjustable pre-tightening force for the clamping frame, preventing the molecular sieve particles from loosening and pulverizing due to airflow impact and equipment vibration. The physical separation formed by the flow equalization plate allows the upper and lower sections of the molecular sieve to be replaced individually without the need for overall disassembly and assembly, solving the problem of frequent overall replacement of molecular sieves in traditional structures and significantly reducing maintenance costs and workload.

[0019] 4. The air inlet duct and the air outlet duct are connected by a sealed flange, which enhances the sealing of the air connection, reduces air leakage loss, and ensures a stable amount of air entering the molecular sieve tank. The dual-channel design of the recovery pipe avoids direct contact between the heat exchange medium and the air to be treated, ensuring the cleanliness of the incoming air and providing a guarantee for the efficient adsorption of the molecular sieve. The backflush holes at the bottom of the dividing flow equalization plate, in conjunction with the backflush interface, can introduce regenerated nitrogen to back purge the lower molecular sieve, accelerate the desorption of adsorbed impurities, improve regeneration efficiency, further ensure the stable operation of the nitrogen production process, and provide a continuous and stable supply of high-purity nitrogen for handheld laser welding.

[0020] 5. The nitrogen generator in this application achieves efficient compatibility with handheld laser welding equipment through a dedicated gas pipeline connection design and start-stop linkage control, perfectly meeting the operational needs of handheld laser welding. Standardized quick-connect couplings and 1.5-5m long high-pressure resistant gas pipelines ensure the sealing and stability of the gas connection between the nitrogen generator and the handheld laser welding equipment, while also providing ample space for flexible movement of the handheld laser welding equipment, avoiding pipeline dragging or insufficient length restricting welding operations. The start-stop linkage function between the nitrogen generator and the handheld laser welding equipment ensures precise synchronization between nitrogen supply and welding operations. Nitrogen is output immediately upon welding start and automatically cut off when welding stops. This avoids nitrogen waste and prevents oxidation of the weld seam due to lack of nitrogen protection during the initial stage of welding or after interruption. It significantly improves the ease of operation and weld quality stability of handheld laser welding, completely solving the pain points of poor compatibility, cumbersome connection, and insufficient coordination between traditional nitrogen generators and handheld laser welding equipment. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a scenario where a nitrogen generator and a handheld laser welding device are used in combination according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a nitrogen generator structure applied to laser welding equipment according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the internal structure of the nitrogen generator housing according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the molecular sieve tank and buffer tank structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the molecular sieve tank and recovery rack structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the recycling rack and recycling pipe according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the internal structure of the molecular sieve tank according to an embodiment of the present invention; Figure 8 This is a schematic diagram of the pressure frame and pressure metal mesh structure according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the clamping column and connecting column structure according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the separation structure of the flow equalization plate and the flow equalization hole according to an embodiment of the present invention; Figure 11 This is a schematic diagram illustrating the application scenario of the nitrogen generator in a platform-type laser welding equipment according to an embodiment of the present invention.

[0022] In the diagram, 1. Nitrogen generator housing; 2. Pressure reducing valve; 3. Molecular sieve tank; 4. Buffer tank; 5. Recovery rack; 6. Inlet duct; 7. Gas delivery pipe; 8. Heat input pipe; 9. Heat output pipe; 10. Recovery pipe; 11. Air flow channel; 12. Heat flow channel; 13. Gas guide pipe; 14. Dividing flow equalization plate; 15. Flow equalization hole; 16. Backflush interface; 17. Backflush hole; 18. Fixing rod; 19. Pressure rack; 20. Pressure metal mesh; 21. Filter cloth; 22. Pressing column; 23. Servo electric cylinder; 24. Sliding block; 25. Sliding rod; 26. Compression spring; 27. Connecting column; 28. Conical flow guide; 29. ​​Inlet flow equalization plate. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Example 1

[0025] Please see Figures 1 to 10 As shown, a nitrogen generator for laser welding equipment includes a nitrogen generator housing 1 and a pressure reducing valve 2 located on one side of the nitrogen generator housing 1. The nitrogen generator housing 1 contains two molecular sieve tanks 3 and two buffer tanks 4. The nitrogen generator housing 1 also contains a recovery rack 5, which is connected to the welding head of the handheld laser welding equipment. The recovery rack 5 transfers waste heat from the welding head to the recovery rack 5, preheating the air entering the molecular sieve tank 3 to prevent the molecular sieve adsorption efficiency from decreasing due to low temperatures, while also reducing the overall energy consumption of the equipment.

[0026] Furthermore, each of the two molecular sieve tanks 3 has an outlet at the top center, each of the two buffer tanks 4 has an inlet at the top of one side, and each of the two buffer tanks 4 has a guide hole at the bottom of one side. One molecular sieve tank 3 and one buffer tank 4 form a nitrogen generation structure. The outlet at the top of the molecular sieve tank 3 in each group is connected to the inlet on one side of the buffer tank 4 through a guide pipe, and the guide hole at the bottom of one side of the buffer tank 4 is connected to one end of the pressure reducing valve 2 through a guide pipe.

[0027] Specifically, the bottom of the recovery rack 5 is fixedly connected to the bottom of the inner wall of the nitrogen generator housing 1. A recovery pipe 10 is fixedly installed inside the recovery rack 5. One end of the recovery pipe 10 is closed, and the other end extends to the outside of the recovery rack 5. An air flow channel 11 is provided in the middle of the inside of the recovery pipe 10. A heat conduction channel 12 is also provided inside the recovery pipe 10 and outside the air flow channel 11. Several heat conduction fins are provided on the inner wall of the heat conduction channel 12. One side of each heat conduction fin extends into the inside of the air flow channel 11. An air supply pipe 7 is provided at the end of the recovery pipe 10 that extends to the outside of the recovery rack 5. The inside of the air supply pipe 7 is connected to the inside of the air flow channel 11. A heat conduction input pipe 8 is fixedly installed on the surface of the end of the recovery pipe 10 that extends to the outside of the recovery rack 5. A heat conduction output pipe 9 is fixedly installed on the surface of the closed end of the recovery pipe 10. The inside of both the heat conduction output pipe 9 and the heat conduction input pipe 8 is connected to the inside of the heat conduction channel 12.

[0028] Furthermore, both molecular sieve tanks 3 are equipped with air inlet pipes 6 at their bottoms, and both sides of the inside of the recovery rack 5 are fixedly equipped with air guide pipes 13. One end of each air guide pipe 13 is connected to one end of the two air inlet pipes 6 through a sealing flange, and one end of each air guide pipe 13 is connected to the inside of the air flow channel 11.

[0029] It should be noted that both air guide pipes 13 are equipped with electromagnetic control valves. When air is introduced into the molecular sieve tank 3, it is sent into the recovery pipe 10 through the air supply pipe 7. The air is transported in the air flow channel 11, and the waste heat of the laser head is replaced by heat exchange medium. Then, the heat exchange medium is sent into the heat conduction channel 12 through the heat conduction input pipe 8. Several heat exchange fins in the heat conduction channel 12 preheat the air in the air flow channel 11. The electromagnetic control valve in the corresponding air guide pipe 13 is opened according to the operation of the molecular sieve tank 3, and the preheated air is sent into the molecular sieve tank 3 for processing. The recovery pipe 10 installed in the recovery rack 5 is used to preheat the air entering the molecular sieve tank 3, avoiding the decrease in molecular sieve adsorption efficiency caused by low temperature, and reducing the overall energy consumption of the equipment.

[0030] According to the specific description of the above structure, the nitrogen generator housing 1 provides an integrated installation carrier for the entire equipment, compactly housing core components such as the molecular sieve tank 3, buffer tank 4, and recovery rack 5, effectively improving the overall portability of the equipment and adapting to the mobile operation requirements of handheld laser welding equipment. The two molecular sieve tanks 3 and the two buffer tanks 4 respectively form two independent nitrogen generation structures, which work alternately with the electromagnetic control valve in the gas guide pipe 13. When one set of molecular sieve tanks 3 is adsorbing and generating nitrogen, the other set can be regenerated simultaneously. The gas guide pipe is connected to the gas inlet on one side of the buffer tank 4 through the gas outlet at the top of the molecular sieve tank 3, ensuring that the nitrogen generation process is continuous and uninterrupted. The design of the connection between the gas guide hole on the lower side of the buffer tank 4 and the pressure reducing valve 2 can first buffer the pressure of the output nitrogen, and then the pressure reducing valve 2 can precisely regulate it to the pressure required by the handheld welding gun head, avoiding pressure fluctuations from affecting the welding quality. The design of the recovery rack 5 and the internal recovery pipe 10 forms a highly efficient waste heat recovery system. The waste heat exchange medium from the laser head is introduced into the heat-conducting channel 12 through the heat-conducting input pipe 8. Combined with the heat-conducting fins extending from the inner wall of the heat-conducting channel 12 to the air channel 11, this achieves sufficient heat exchange between the heat-conducting medium and the air supplied by the air supply pipe 7 into the air channel 11. The preheated air enters the molecular sieve tank 3 through the air guide pipe 13 and the air inlet duct 6. This avoids the attenuation of molecular sieve adsorption efficiency caused by low-temperature air and efficiently utilizes the waste heat from the welding head, significantly reducing the overall energy consumption of the equipment. Simultaneously, the heat-conducting output pipe 9 ensures the circulation of the heat exchange medium, further enhancing the sustainability of waste heat utilization. The sealing flange connection between the air inlet duct 6 and the air guide pipe 13 enhances the air circuit sealing and reduces air leakage losses. The independent design of the air channel 11 and the heat-conducting channel 12 ensures both the air preheating effect and avoids direct contact between the heat exchange medium and the air to be treated, ensuring the cleanliness of the incoming air and guaranteeing the efficient adsorption of the molecular sieve tank 3.

[0031] The nitrogen generator proposed in this application is an independent nitrogen-generating device that is used in conjunction with a handheld laser welding device through a dedicated gas pipeline. It is suitable for various handheld laser welding scenarios such as hardware processing, automotive repair, pipeline installation, and outdoor emergency repairs. Before use, the operator connects one end of the 1.5-5m high-pressure resistant gas pipeline provided with the nitrogen generator to the output end of the pressure reducing valve 2, and the other end to the protective gas inlet of the handheld laser welding device through a standardized quick-connect connector. Gas line sealing can be achieved without additional sealing components, and the connection time is ≤3 seconds. Depending on the requirements of the welding operation site, the nitrogen generator can be placed on the ground, on a work cart, or in a convenient location near the handheld laser welding device. The length of the gas pipeline can allow the operator to move the handheld welding machine freely within a range of 1.5-5m, adapting to different welding angles and working distance requirements.

[0032] When the handheld laser welding equipment starts welding, its start / stop signal is transmitted to the nitrogen generator via the control interface. The nitrogen generator simultaneously starts the nitrogen supply process, and high-purity nitrogen, after staged adsorption, is quickly delivered to the protective gas outlet of the handheld laser welding equipment through the gas pipeline. It is then sprayed out synchronously with the welding beam, effectively protecting the weld area. When the handheld laser welding equipment stops welding, the nitrogen generator receives a signal and automatically cuts off the nitrogen supply to avoid unnecessary consumption. In outdoor mobile welding scenarios, the compact structure and independent operation of the nitrogen generator do not require any auxiliary equipment other than an external power supply, and can work in conjunction with the handheld laser welding equipment to meet the construction needs without a fixed work site. In intermittent welding scenarios, the start / stop linkage function ensures that nitrogen is in place in time each time welding starts, avoiding initial oxidation of the weld caused by manually turning on the nitrogen generator, greatly improving the work efficiency and quality stability of handheld laser welding. Example 2

[0033] Specifically, this embodiment discloses the internal structure of the molecular sieve tank 3. A conical guide frame 28 is fixedly installed at the bottom of the molecular sieve tank 3, and the bottom end of the conical guide frame 28 is connected to one end of the air inlet duct 6. A number of guide holes are provided at the top of the conical guide frame 28, and the interior of the number of guide holes is connected to the interior of the air inlet duct 6.

[0034] Furthermore, an inlet flow equalization plate 29 is fixedly installed inside the molecular sieve tank 3, below and above the inlet flow equalization plate 29, with a diffusion gap between the inlet flow equalization plate 29 and the conical guide frame 28; a partition flow equalization plate 14 is also fixedly installed in the middle of the molecular sieve tank 3, and both the partition flow equalization plate 14 and the inlet flow equalization plate 29 are provided with several flow equalization holes 15, and each of the flow equalization holes 15 is embedded with a silicone valve core that deforms with the gas pressure; when the nitrogen generator starts or stops, causing fluctuations in the gas flow pressure, the valve core automatically adjusts the opening of the through hole, increasing the opening when the pressure is high and decreasing the opening when the pressure is low, so that the gas flow velocity is always stable at the optimal adsorption flow rate of 0.8-1.2m / s, avoiding a decrease in adsorption efficiency caused by sudden changes in gas flow.

[0035] It should be noted that each flow equalization hole 15 inside the separation flow equalization plate 14 and the inlet flow equalization plate 29 is a conical hole. The diameter of each flow equalization hole 15 gradually decreases from bottom to top, forming an inverted conical through hole with a diameter of 1-5 mm and a hole spacing of 10-15 mm, arranged in an equilateral triangle. The airflow initially diffused by the conical guide frame 28 vertically impacts the inlet flow equalization plate 29 and is forced to pass through the evenly distributed flow equalization holes 15 on the inlet flow equalization plate 29. Since the small holes are conical with a smaller top and a larger bottom, the airflow forms a beam effect when it passes through, which further evenly distributes the air and reduces the flow velocity. Finally, it enters the molecular sieve layer in the form of a uniform and stable airflow blanket, ensuring uniform adsorption of the entire molecular sieve bed and avoiding local channeling phenomena.

[0036] Furthermore, the bottom of the flow equalization plate 14 is provided with several backflush holes 17, and the interior of the flow equalization plate 14 is provided with a backflush channel communicating with the interior of the several backflush holes 17. The side of the molecular sieve tank 3 is provided with a backflush interface 16, and one end of the backflush interface 16 is connected to the interior of the backflush channel. Example 3

[0037] Specifically, molecular sieve clamping assemblies are installed at both the upper and lower parts inside the molecular sieve tank 3. These assemblies include clamping frames 19, clamping metal meshes 20, and filter cloth 21. A fixing rod 18 is fixedly installed between the upper and lower parts of the molecular sieve tank 3 via a connecting frame. Clamping frames 19 are movably installed at both the upper and lower parts of the molecular sieve tank 3. Clamping metal meshes 20 are fixedly installed inside each of the two clamping frames 19, and filter cloth 21 is fixedly installed on the opposite side of each clamping metal mesh 20. The interiors of the two clamping metal meshes 20 and the filter cloth 21 are slidably connected to the surface of the fixing rod 18. The space between the filter cloth 21 and the dividing flow equalization plate 14 inside the molecular sieve tank 3 (lower section) is filled with mesoporous molecular sieves for preferential adsorption of large molecular impurities such as water vapor and carbon dioxide. The space between the filter cloth 21 and the dividing flow equalization plate 14 inside the molecular sieve tank 3 (upper section) is filled with microporous molecular sieves for nitrogen and oxygen separation. By using the dividing flow equalization plate 14 as the grading boundary between the upper and lower sections inside the molecular sieve tank 3, non-gradation is avoided. Mixing with molecular sieves enables stepwise adsorption of coarse purification and fine separation of air entering the molecular sieve tank 3, effectively improving nitrogen purity. Furthermore, the airflow is forcibly dispersed by the flow equalization plate 14 before entering the upper molecular sieve layer, ensuring that the airflow passes through the molecular sieve particles at a uniform speed and direction in both sections. This significantly improves the overall adsorbent utilization rate and reduces nitrogen purity fluctuations. The flow equalization plate 14 disperses the vertical impact force of the airflow, effectively reducing the impact intensity on the upper molecular sieve layer. Simultaneously, the small space between the flow equalization plate 14 and the molecular sieve layer forms an airflow buffer, reducing friction between molecular sieve particles and extending molecular sieve life. The flow equalization plate 14 physically separates the molecular sieve layers inside the molecular sieve tank 3, allowing for individual replacement of the upper or lower molecular sieves with declining adsorption performance during maintenance, eliminating the need for complete replacement and reducing maintenance costs. The flow equalization plate 14 also prevents molecular sieve particles from mixing during maintenance, ensuring the structural integrity of the staged adsorption process.

[0038] Furthermore, four clamping columns 22 are fixedly installed at the top and bottom of the molecular sieve tank 3, and a connecting column 27 is movably installed at one end of each of the four clamping columns 22. One end of each of the four connecting columns 27 is connected to the four sides of the inside of the upper and lower pressing frame 19, respectively. A servo electric cylinder 23 is fixedly installed inside the clamping column 22, and a sliding block 24 is fixedly installed at one end of the drive shaft of the servo electric cylinder 23. The inside of the sliding block 24 is slidably connected to the inside of the clamping column 22. A sliding rod 25 is fixedly installed on one side of the sliding block 24, and the top end of the sliding rod 25 is slidably connected to the inside of the connecting column 27. A compression spring 26 is sleeved on the surface of the sliding rod 25. The top end of the compression spring 26 is fixedly connected to the bottom of the connecting column 27, and the bottom end of the compression spring 26 is fixedly connected to the top of the sliding block 24.

[0039] It should be noted that the compression spring 26 provides elastic support to one end of the connecting column 27, allowing the pressure frame 19 at one end of the connecting column 27 to completely cover the molecular sieve layer and apply a continuous pre-tightening force, thereby preventing the problem of loosening and pulverizing of molecular sieve particles caused by airflow impact; the servo electric cylinder 23 further adjusts the pre-tightening force applied by the connecting column 27 to the pressure frame 19.

[0040] According to the specific description of the above structure, the conical guide frame 28 is connected to the air inlet duct 6 and initially diffuses the incoming air through the top guide hole. Combined with the air inlet flow equalization plate 29 above it and the inverted conical flow equalization holes 15 arranged in an equilateral triangle on the plate, the airflow is further evenly distributed and the flow velocity is reduced using the beam effect, allowing the airflow to enter the molecular sieve layer in a stable airflow blanket form, effectively avoiding local channeling phenomena. The separating flow equalization plate 14 serves as the classification boundary between the upper and lower sections of the molecular sieve layer. The silicone valve core embedded in the flow equalization holes 15 inside it can automatically adjust the opening according to the air pressure, precisely controlling the airflow velocity between 0.8-1.2 m / s. The optimal adsorption flow rate is achieved to avoid sudden airflow changes caused by the start-up and shutdown of the nitrogen generator. Simultaneously, the backflush holes 17 at the bottom of the flow equalization plate 14, in conjunction with the backflush channel and backflush interface 16, allow the introduction of regenerated nitrogen to back-purge the lower molecular sieve, accelerating the desorption process and improving nitrogen production continuity. The core component is an independently configured molecular sieve clamping assembly for the upper and lower sections. The fixing rod 18 provides installation support for the clamping frame 19. The clamping metal mesh 20 and filter cloth 21 work together to achieve seamless coverage of the molecular sieve layer. The servo electric cylinder 23 inside the clamping column 22, via the sliding block 24 and sliding rod 2... The drive connecting column 27, in conjunction with the elastic support of the compression spring 26, provides a continuously adjustable pre-tightening force for the pressure frame 19, preventing the molecular sieve from loosening and pulverizing due to airflow impact and equipment movement. At the same time, the upper and lower sections of the molecular sieve layer separated by the flow equalization plate 14 are filled with mesoporous molecular sieves and microporous molecular sieves respectively, realizing the stepwise adsorption of coarse purification of water vapor and carbon dioxide and fine separation of nitrogen and oxygen, significantly improving the purity of nitrogen. Moreover, the physically separated structural design makes it easy to replace the molecular sieve of the attenuation section separately, greatly reducing maintenance costs and extending the overall service life of the molecular sieve. Example 4

[0041] Specifically, this embodiment discloses a usage scenario for a nitrogen generator used in laser welding equipment combined with a handheld laser device, as follows: The workflow of this nitrogen generator is deeply integrated with the operating logic of the handheld laser welding device, and a dedicated adaptation mechanism is designed for the independent operation, flexible movement, and frequent start-stop characteristics of the handheld laser welding device: Independent Collaborative Scenarios: The nitrogen generator and the handheld laser welding equipment are powered and operated independently. The protective gas is delivered stably through gas pipelines, which does not affect the performance of either equipment and ensures connection reliability through standardized interfaces, adapting to the universal connection needs of different brands and models of handheld laser welding equipment. Mobile welding adaptation: When the operator moves the laser welding equipment in the work area, the 1.5-5m long high-pressure gas pipeline can follow flexibly. The pipeline material is resistant to bending and dragging, and will not cause gas leakage or breakage due to movement, ensuring the continuity of nitrogen supply during the welding process. Multi-mode adaptation: For continuous welding mode of handheld laser welding equipment, the dual nitrogen generator units work alternately to continuously output high-purity nitrogen to meet the protection needs of long-term welding; for intermittent welding mode, the start-stop linkage function precisely controls the timing of nitrogen supply to avoid nitrogen waste. At the same time, the pressure-stabilized storage of buffer tank 4 prevents nitrogen pressure fluctuations caused by frequent start-stop, ensuring consistent protection effect for each welding.

[0042] The working method of the nitrogen generator includes the following steps: First, the waste heat of the handheld laser welding head is replaced by a heat exchange medium. The heat exchange medium carrying the waste heat is sent into the heat-conducting channel 12 of the recovery pipe 10 inside the recovery rack 5 through the heat-conducting input pipe 8. The heat exchange medium circulates in the heat-conducting channel 12 and transfers heat to the air channel 11 through the heat-conducting fins on the inner wall, completing the heat preparation of the preheating system. Second, the air to be treated is sent into the air channel 11 of the recovery pipe 10 through the air supply pipe 7. During the flow, the air comes into full contact with the heat-conducting fins and absorbs the heat transferred by the heat exchange medium to complete the preheating treatment. The heat-exchanged medium is discharged through the heat-conducting output pipe 9 and circulated back to the welding head for waste heat recovery, forming a closed-loop waste heat utilization system.

[0043] Step Two: The control system opens the electromagnetic control valve inside the gas guide pipe 13 connected to the first molecular sieve tank 3. Preheated air enters the first molecular sieve tank 3 through the gas guide pipe 13 and the inlet duct 6. The air first enters the conical guide frame 28 at the bottom of the molecular sieve tank 3, where it undergoes initial diffusion through the guide holes at the top. It then enters the diffusion gap between the conical guide frame 28 and the inlet flow equalization plate 29 for buffering, before vertically impacting the inlet flow equalization plate 29. The air then forms a beam effect through the inverted conical flow equalization holes 15 arranged in an equilateral triangle on the plate, further equalizing the flow and reducing the velocity. After passing through the inlet flow equalization plate 29, the airflow enters the lower molecular sieve layer, where it is again equalized by the separating flow equalization plate 14. Upon entering the upper molecular sieve layer, the silica gel valve core within the equalization orifice 15 automatically adjusts its opening according to changes in airflow pressure, ensuring that the airflow velocity remains stable within the optimal adsorption range. The lower microporous molecular sieve preferentially adsorbs large molecular impurities such as water vapor and carbon dioxide from the air, while the upper microporous molecular sieve focuses on nitrogen and oxygen separation. The high-purity nitrogen gas after two stages of adsorption is sent to the corresponding first-group buffer tank 4 for storage through the vent and gas guide pipe at the top of the molecular sieve tank 3. When the first-group molecular sieve tank 3 reaches the adsorption saturation threshold, the control system closes its corresponding electromagnetic control valve and simultaneously opens the electromagnetic control valve of the second-group nitrogen generation unit. The above process is repeated to achieve continuous nitrogen generation, while the first-group unit enters the regeneration process.

[0044] Step 3: A portion of the dry nitrogen from the second buffer tank 4 is introduced into the backflushing channel of the first molecular sieve tank 3 through the backflushing interface 16. The upper and lower sections of the molecular sieve layer are backflushed through the backflushing holes 17 at the bottom of the dividing flow equalization plate 14, and the adsorbed impurities are desorbed and discharged through the exhaust port. After regeneration, the first unit is in standby mode. The two units cycle alternately to achieve continuous operation of adsorption and regeneration. The nitrogen stored in the buffer tank 4 enters the gas guide pipe through the gas guide hole below it. When it flows through the pressure reducing valve 2, it is precisely controlled to the pressure required by the handheld welding gun head, and then stably delivered to the welding gun head to provide continuous high-purity nitrogen protection for laser welding. During the nitrogen generation and regeneration process, the control system drives the sliding block 24 to slide along the pressing column 22 through the servo electric cylinder 23 according to the pressure change in the molecular sieve tank 3. The compression spring 26 on the surface of the slide rod 25 adjusts the pre-tightening force of the connecting column 27 on the pressing frame 19 to ensure that the pressing metal mesh 20 and the filter cloth 21 always form a stable coating on the molecular sieve layer and prevent the molecular sieve particles from loosening and pulverizing.

[0045] Step 4: After the welding operation is completed, first close the air inlet valve of the gas supply pipe 7 to stop the air supply. After the nitrogen in the buffer tank 4 has been completely output, close the waste heat recovery circulation system and finally turn off the main power supply of the nitrogen generator. During regular maintenance, the molecular sieve of the corresponding section can be replaced separately by removing the end cover of the molecular sieve tank 3 according to the adsorption attenuation of the upper and lower molecular sieves. There is no need to disassemble the whole structure, which reduces the difficulty of maintenance. Example 5

[0046] Specifically, this embodiment also provides an explanation of the application scenarios for platform-type laser welding and laser cutting equipment, including application scenarios for platform-type laser welding equipment and large PSA nitrogen generator units adapted to laser cutting equipment.

[0047] like Figure 11 As shown, the application instructions for platform-type laser welding equipment are as follows: This nitrogen generator is directly compatible with platform-type laser welding equipment. The nitrogen generator housing 1, pressure reducing valve 2, molecular sieve tank 3, buffer tank 4, and recovery rack 5 remain unchanged. One end of a 1.5-5m high-pressure resistant gas pipeline is sealed to the output of pressure reducing valve 2, while the other end connects quickly to the protective gas inlet of the platform welding equipment via a standardized quick-connect coupling. The control interface on the nitrogen generator housing 1 is linked to the start / stop and worktable movement signals of the platform welding equipment, achieving synchronized start / stop and stable pressure output of nitrogen supply and welding operations. Two sets of molecular sieve tanks 3 and buffer tanks 4 alternately perform adsorption nitrogen generation and regeneration backflushing. Combined with the pressure stabilization of buffer tank 4 and precise pressure adjustment of pressure reducing valve 2, it can meet the long-term needs of platform welding. For continuous operation, uninterrupted gas supply, and pressure fluctuation-free gas supply requirements, the recovery rack 5 recovers the waste heat from the welding joints of the platform welding to preheat the incoming air, avoiding the reduction of molecular sieve adsorption activity due to low temperature. The molecular sieve tank 3 has a flow equalization plate 14 that realizes the step-by-step adsorption and purification of mesoporous and microporous molecular sieves. Combined with the multi-stage flow equalization of the incoming air flow equalization plate 29, the conical guide rack 28, and the molecular sieve pressing assembly composed of the pressing rack 19, the pressing metal mesh 20, and the filter cloth 21, it can prevent particles from loosening and pulverizing. It can continuously output high-purity nitrogen, effectively avoiding defects such as oxidation, porosity, and yellowing of platform welding seams. It is suitable for fixed installation and long-term continuous operation platform welding operation scenarios such as sheet metal production lines and automated welding workstations.

[0048] Application instructions for large PSA nitrogen generator units adapted to laser cutting equipment: This nitrogen generator is compatible with or expandable to be used in large PSA nitrogen generator units adapted to laser cutting equipment. Based on the original nitrogen generator housing 1, pressure reducing valve 2, molecular sieve tank 3, buffer tank 4, and recovery rack 5, the volume of molecular sieve tank 3 can be increased and the gas storage capacity of buffer tank 4 strengthened to match the high flow rate, high pressure, and high purity nitrogen supply requirements of laser cutting. After the gas supply is adjusted to the cutting-compatible pressure by pressure reducing valve 2, it is connected to the cutting head protective gas and auxiliary gas interfaces through a high-pressure resistant pipeline. The control interface of nitrogen generator housing 1 is linked to the laser cutting piercing, cutting, follow-up, and shutdown signals, automatically adjusting the gas supply status according to the process. The molecular sieve tank 3 has a conical inner section... The flow guide 28, air inlet equalization plate 29, and separation equalization plate 14 ensure uniform and stable airflow. The backflush interface 16 and backflush hole 17 enhance regeneration efficiency. The recovery rack 5 recovers waste heat from the cutting head to preheat the air inlet and improves nitrogen production efficiency under low-temperature conditions. The pressing structure of the pressing rack 19, pressing metal mesh 20, and filter cloth 21 reduces molecular sieve pulverization loss. The produced high-purity nitrogen can be used as a cutting auxiliary gas to reduce slag adhesion and improve the surface finish of the cut surface. At the same time, it prevents oxidation and discoloration of the cut surfaces of materials such as stainless steel and aluminum alloys, meeting the continuous and stable gas supply and low-maintenance operation requirements of tabletop or large laser cutting machines, plate or pipe high-speed cutting production lines.

[0049] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A nitrogen generator for use in laser welding equipment, characterized in that, The nitrogen generator housing (1) includes a pressure reducing valve (2) located on one side of the nitrogen generator housing (1). The nitrogen generator housing (1) is equipped with two molecular sieve tanks (3), two buffer tanks (4), and a recovery rack (5). The recovery rack (5) is connected to the welding head of the handheld laser welding equipment to recover waste heat from the welding head. Each of the two molecular sieve tanks (3) has an exhaust port on its top, and each of the two buffer tanks (4) has an inlet port and a guide port on one side. Each molecular sieve tank (3) and each buffer tank (4) constitute a set of independent nitrogen generator structures. Each set contains two molecular sieve tanks (3, 4, and 5). The air outlet of 3) is connected to the air inlet of the buffer tank (4) through the air guide pipe, and the air guide of the buffer tank (4) is connected to the pressure reducing valve (2) through the air guide pipe; the recovery rack (5) has a recovery pipe (10) fixed inside, and the recovery pipe (10) is provided with an air flow channel (11) and a heat conduction channel (12). The inner wall of the heat conduction channel (12) is provided with heat conduction fins extending into the air flow channel (11); the bottom of the molecular sieve tank (3) is connected to the air inlet pipe (6), and one end of the air guide pipe (13) in the recovery rack (5) is connected to the air inlet pipe (6), and the other end is connected to the air flow channel (11).

2. A nitrogen generator for use in laser welding equipment according to claim 1, characterized in that, The recovery pipe (10) is closed at one end and extends to the outside of the recovery rack (5) at the other end. The extended end of the recovery pipe (10) is connected to the air supply pipe (7) and the heat input pipe (8), while the closed end is connected to the heat output pipe (9). The air supply pipe (7) is connected to the air flow channel (11), and the heat input pipe (8) and the heat output pipe (9) are both connected to the heat flow channel (12) to form a heat exchange medium circulation loop.

3. A nitrogen generator for use in laser welding equipment according to claim 1, characterized in that, The bottom of the molecular sieve tank (3) is fixed with a conical guide frame (28). The bottom end of the conical guide frame (28) is connected to the air inlet duct (6). The top of the conical guide frame (28) is provided with several guide holes that communicate with the inside of the air inlet duct (6). An air inlet equalization plate (29) is also fixed at the bottom of the molecular sieve tank (3). An air inlet equalization plate (29) is reserved between the air inlet equalization plate (29) and the conical guide frame (28).

4. A nitrogen generator for use in laser welding equipment according to claim 3, characterized in that, The molecular sieve tank (3) has a dividing flow equalization plate (14) fixed in the middle. Both the dividing flow equalization plate (14) and the air inlet flow equalization plate (29) have several flow equalization holes (15). Each flow equalization hole (15) is embedded with a silicone valve core that can deform with air pressure. The flow equalization hole (15) is an inverted conical through hole.

5. A nitrogen generator for use in laser welding equipment according to claim 4, characterized in that, The bottom of the dividing flow equalization plate (14) is provided with several backflush holes (17), and the inside is provided with a backflush channel communicating with the backflush holes (17); a backflush interface (16) is installed on one side of the molecular sieve tank (3), and one end of the backflush interface (16) is connected to the inside of the backflush channel for connecting the regeneration backflush gas.

6. A nitrogen generator for use in laser welding equipment according to claim 1, characterized in that, The molecular sieve tank (3) is equipped with molecular sieve pressing components at both the top and bottom. The pressing components include a pressing frame (19), a pressing metal mesh (20), and a filter cloth (21). A fixing rod (18) is fixed inside the molecular sieve tank (3) through a connecting frame. The pressing frame (19) is movably set inside the tank and cooperates with the fixing rod (18). The pressing metal mesh (20) is fixed inside the pressing frame (19), and the filter cloth (21) is fixed on the opposite side of the pressing metal mesh (20). Both the pressing metal mesh (20) and the filter cloth (21) are slidably connected to the fixing rod (18).

7. A nitrogen generator for use in laser welding equipment according to claim 6, characterized in that, The space between the lower filter cloth (21) and the dividing flow equalization plate (14) inside the molecular sieve tank (3) is filled with a medium-microporous molecular sieve to preferentially adsorb large molecular impurities such as water vapor and carbon dioxide; the space between the upper filter cloth (21) and the dividing flow equalization plate (14) is filled with a microporous molecular sieve to achieve nitrogen and oxygen separation.

8. A nitrogen generator for use in laser welding equipment according to claim 6, characterized in that, The molecular sieve tank (3) has four clamping columns (22) fixed at the top and bottom. Each clamping column (22) has a connecting column (27) movably connected to one end. The corresponding connecting columns (27) are fixedly connected to the inside of the upper and lower pressure racks (19). A servo electric cylinder (23) is fixed inside the clamping column (22). A sliding block (24) is fixed at the end of the drive shaft of the servo electric cylinder (23). A sliding rod (25) is fixed on one side of the sliding block (24). The top of the sliding rod (25) slides in cooperation with the inside of the connecting column (27). A compression spring (26) is sleeved on the surface of the sliding rod (25). The top of the compression spring (26) is fixedly connected to the bottom of the connecting column (27), and the bottom is fixedly connected to the top of the sliding block (24), forming an elastic pre-tightening structure.

9. A nitrogen generator for use in laser welding equipment according to claim 1, characterized in that, Both of the gas guide pipes (13) are equipped with electromagnetic control valves to control the gas inlet of the corresponding molecular sieve tank (3); the connection between the gas inlet duct (6) and the gas guide pipe (13) is sealed with a sealing flange.

10. A nitrogen generator for use in laser welding equipment according to claim 1, characterized in that, The nitrogen generator is equipped with a gas pipeline with a length of 1.5-5m. One end of the gas pipeline is sealed to the output end of the pressure reducing valve (2), and the other end is equipped with a standardized quick-connect connector adapted to the protective gas inlet of the handheld laser welding equipment. The quick-connect connector is sealed to the gas path interface of the protective gas outlet of the handheld laser welding equipment. The nitrogen generator housing (1) is equipped with a control interface that is linked to the start and stop signal of the handheld laser welding equipment. It synchronously responds to the welding start and stop command of the handheld laser welding equipment, realizes the automatic opening and closing of nitrogen supply, and adapts to various operating modes of the handheld laser welding equipment.

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