A finned heat sink for a high power CO2 axial fast-flow laser

Abstract

The utility model relates to CO2 axle fast flow laser technology field discloses a fin radiator of high power CO2 axle fast flow laser, in the high temperature mixed gas flow process through heat convection to transfer heat to fin, and the fin passes through heat conduction to transfer heat to the cooling liquid in the base pipe, and the cooling liquid carries away heat to reach the purpose of reducing mixed gas temperature, and through the same cross section inner chamber area of first pipeline and second pipeline and being equipped with A1, the cross section inner chamber area of shell is equipped with A2, the planar projection area of base pipe and multiple fins is equipped with A3, satisfies A2 A3 A1, thereby ensuring that the radiator gap cross section area is greater than the cross section inner chamber area of first pipeline, second pipeline, effectively controls the gas flow resistance of high temperature mixed gas, and simultaneously because the radiator needs to be integrated in the vacuum pipeline, the shell adopts stainless steel sheet welding forming, thereby can guarantee the high air tightness and pressure bearing capacity of radiator.

Description

Technical Field

[0001] This utility model relates to the field of CO2 axis fast-flow laser technology, and in particular to a finned heat sink for a high-power CO2 axis fast-flow laser. Background Technology

[0002] The working medium of a CO2-axis fast-flow laser is primarily composed of carbon dioxide (CO2), nitrogen (N2), and helium (He). Under the influence of high-voltage direct current, the gas mixture is excited, causing CO2 molecules to transition to higher energy levels (excited states). When these excited CO2 molecules transition back to lower energy levels, they release photons. These photons are reflected and amplified within an optical resonant cavity composed of total and partial reflection mirrors, ultimately outputting a high-intensity laser beam through the partial reflection mirror. During this process, electrical energy is converted into light energy, but a significant amount of heat is generated due to resistive and non-radiative transitions. Because CO2-axis fast-flow lasers generate substantial heat during operation, if this heat cannot be dissipated in time, the gas temperature will rise, affecting the energy level distribution of the laser medium and the laser output efficiency, and may even cause the equipment to overheat and shut down. Therefore, an efficient cooling system is crucial for ensuring the stable operation of the laser.

[0003] Currently, high-power CO2-axis fast-flow lasers commonly employ finned heat sinks for cooling. These heat sinks consist of a base tube and fins. The base tube is made of copper, and the fins are made of copper strips. The fins are tightly fixed to the base tube, creating a large heat dissipation area. The heat transfer medium (gas mixture) flows between the fins, transferring heat to the fins through convection. The fins then transfer heat to the coolant in the base tube through conduction, and the coolant carries the heat away, thus lowering the temperature of the gas mixture.

[0004] However, the existing technology has the following main problems: (1) Heat dissipation efficiency bottleneck: High-power lasers generate concentrated heat. If the heat sink area or coolant flow rate is insufficient, the heat cannot be dissipated in time, which can easily lead to equipment overheating and shutdown; (2) Space constraints and design contradictions: The vacuum pipe structure of CO2 axis fast-flow laser is compact. The heat sink needs to be integrated inside the pipe where the heat medium flows. In a limited space, the heat sink design needs to achieve a balance between heat dissipation performance and gas flow stability. An excessively large heat sink area will increase gas flow resistance and affect the uniformity of the laser medium and the laser output quality. On the other hand, an excessively small heat dissipation area cannot meet the heat dissipation requirements. Utility Model Content

[0005] The purpose of this invention is to provide a finned heat sink for a high-power CO2 axial fast-flow laser, which solves the problem of rapid cooling of the heat medium (high-temperature mixed gas).

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a finned heat sink for a high-power CO2 axial fast-flow laser, comprising a shell, a base tube disposed within the shell, and multiple fins disposed on the base tube. A first pipe for high-temperature mixed gas to flow into the bottom of the shell is provided, and a second pipe for the high-temperature mixed gas to flow out after heat exchange is provided at the top of the shell. The two ends of the base tube extend above and below the side of the shell, respectively. A cooling water inlet connector is provided at the lower end of the base tube extending from the side of the shell, and a cooling water outlet connector is provided at the upper end of the base tube extending from the side of the shell. The cross-sectional area of ​​the first and second pipes is the same and is designated as A1. The cross-sectional area of ​​the shell is designated as A2. The top-view projection area of ​​the base tube and multiple fins is designated as A3, satisfying A2-A3>A1. The shell is formed by welding stainless steel sheet, and the two ends of the base tube are welded and fixed to the shell. The cooling water inlet connector and cooling water outlet connector are compression fittings.

[0007] By adopting the above technical solution, the high-temperature mixed gas enters the shell along the first pipe and exits along the second pipe. During the flow of the high-temperature mixed gas, heat is transferred to the fins through thermal convection. The fins then transfer heat to the coolant in the base tube through thermal conduction. The coolant carries away the heat, thereby reducing the temperature of the mixed gas. The high-temperature mixed gas, after heat exchange, flows out from the second pipe. Furthermore, by making the cross-sectional area of ​​the first and second pipes the same and denoted as A1, the cross-sectional area of ​​the shell denoted as A2, and the top-view projection area of ​​the base tube and multiple fins denoted as A3, A2-A3>A1 is satisfied, thus ensuring that the cross-sectional area of ​​the radiator gap is greater than the cross-sectional area of ​​the first and second pipes, effectively controlling the gas flow resistance of the high-temperature mixed gas. At the same time, since the radiator needs to be integrated into the vacuum pipe, the shell is made of stainless steel sheet welded into shape, which can ensure the high airtightness and pressure resistance of the radiator. The cooling water inlet and outlet joints adopt compression fittings, thereby achieving convenient connection.

[0008] A further feature of this invention is that the base pipe includes an inflow section, multiple planar serpentine sections, multiple connecting sections, and an outflow section. The multiple planar serpentine sections are arranged along the flow direction of the high-temperature mixed gas. The uppermost planar serpentine section is connected to the inflow section, and the lowermost planar serpentine section is connected to the outflow section. The connecting section is used to connect two adjacent planar serpentine sections. The inflow section and the outflow section are welded and fixed to the outer shell and extend out of the outer shell.

[0009] By adopting the above technical solution, multiple planar serpentine segments are arranged and distributed along the flow direction of the high-temperature mixed gas, and the connecting segment is used to connect two adjacent planar serpentine segments. At this time, it is equivalent to folding the continuous serpentine tube back and forth along the vertical direction to extend the length of the base tube within a limited space, thereby increasing the flow time and path of the cooling water, so that the cooling water has enough time for heat exchange.

[0010] A further feature of this invention is that multiple fins are arranged in a row and each fin is fixed to the straight portion of multiple planar serpentine segments.

[0011] By adopting the above technical solution, each fin is fixed to the straight part of multiple planar serpentine segments, so that each fin is connected to multiple planar serpentine segments, thereby improving heat exchange efficiency; at the same time, in the process of arranging and distributing the base tube and fins, there is a cavity along the height direction of the shell, which can reduce the flow resistance of the high-temperature mixed gas.

[0012] A further feature of this invention is that the weld seam of the outer shell is a full penetration weld structure.

[0013] By adopting the above technical solution, the radiator needs to be integrated into the vacuum pipe. The full penetration weld structure effectively eliminates the micropores or gaps that may be caused by incomplete penetration through the welding method, thereby ensuring the high airtightness of the shell under vacuum conditions.

[0014] A further feature of this invention is that a dispersion hood is provided inside the lower end of the outer shell, which communicates with the first pipe and has multiple dispersion channels for dispersing the high-temperature mixed gas.

[0015] By adopting the above technical solution, the high-temperature mixed gas entering the shell from the first pipe can be discharged from multiple dispersion channels under the action of the dispersion hood, thereby improving the uniformity of heat exchange during the contact process between the high-temperature mixed gas and the base pipe and the bottom of the fins.

[0016] A further feature of this invention is that a conical shroud communicating with the second pipe and guiding the high-temperature mixed gas out is provided inside the upper end of the outer shell, and the diameter of the conical shroud decreases along the direction toward the second pipe.

[0017] By adopting the above technical solution, during the process of the high-temperature mixed gas entering the second pipe from the outer shell after heat exchange, the conical shroud can guide and gather the high-temperature mixed gas, avoiding the problem of the high-temperature mixed gas colliding with the top of the outer shell and causing airflow turbulence.

[0018] A further feature of this invention is that the upper diameter of the conical shroud is the same as the diameter of the second pipe, the lower end of the conical shroud is welded to the inner wall of the housing, and a plurality of guide vanes arranged in a circumferential array are provided inside the conical shroud.

[0019] By adopting the above technical solution, multiple guide vanes arranged in a circular array can guide and organize the high-temperature mixed gas, thus avoiding airflow turbulence.

[0020] The beneficial effects of this utility model are as follows: the high-temperature mixed gas enters the shell along the first pipe and exits along the second pipe. During the flow of the high-temperature mixed gas, heat is transferred to the fins through thermal convection. The fins transfer heat to the coolant in the base tube through thermal conduction. The coolant carries away the heat, thereby achieving the purpose of reducing the temperature of the mixed gas. The high-temperature mixed gas after heat exchange flows out from the second pipe. Furthermore, by making the cross-sectional inner cavity area of ​​the first and second pipes the same and set as A1, the cross-sectional inner cavity area of ​​the shell set as A2, and the top-view projection area of ​​the base tube and multiple fins set as A3, the condition A2-A3>A1 is met, thereby ensuring that the cross-sectional area of ​​the radiator gap is greater than the cross-sectional inner cavity area of ​​the first and second pipes, effectively controlling the gas flow resistance of the high-temperature mixed gas. At the same time, since the radiator needs to be integrated in the vacuum pipe, the shell is made of stainless steel sheet welded into shape, thereby ensuring the high airtightness and pressure resistance of the radiator. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of Example 1;

[0023] Figure 2 This is a partial structural cross-sectional view of an embodiment;

[0024] Figure 3 This is a schematic diagram of the structure at the connection between the base tube, fins and shell in this utility model;

[0025] Figure 4 This is a structural schematic diagram from another perspective of the connection between the base tube, fins, and shell in this utility model.

[0026] Figure 5 This is a partial structural cross-sectional view of Embodiment 2.

[0027] In the diagram: 1. Outer shell; 11. First pipe; 12. Second pipe; 2. Base pipe; 21. Inflow section; 22. Planar serpentine section; 23. Connecting section; 24. Outflow section; 3. Fins; 4. Cooling water inflow connector; 5. Cooling water outflow connector; 6. Dispersion shroud; 61. Dispersion channel; 7. Conical shroud; 71. Guide vane. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] Example 1: A finned heat sink for a high-power CO2 axial fast-flow laser, such as Figure 1 and Figure 2 As shown, it includes an outer shell 1, a base tube 2 disposed inside the outer shell 1, and multiple fins 3 disposed on the base tube 2. A first pipe 11 for high-temperature mixed gas to flow in is disposed at the bottom of the outer shell 1, and a second pipe 12 for high-temperature mixed gas to flow out after heat exchange is disposed at the top of the outer shell 1. The two ends of the base tube 2 extend out of the upper and lower sides of the outer shell 1, respectively. A cooling water inlet connector 4 is disposed at the lower side of the base tube 2, and a cooling water outlet connector 5 is disposed at the upper side of the base tube 2.

[0030] like Figure 1 As shown, the outer shell 1 is formed by welding stainless steel plate. The first pipe 11 and the second pipe 12 are both welded to the outer shell 1. The weld seam of the outer shell 1 is a full penetration weld structure.

[0031] like Figures 2 to 4 As shown, the base pipe 2 includes an inflow section 21, multiple planar serpentine sections 22, multiple connecting sections 23, and an outflow section 24. The multiple planar serpentine sections 22 are arranged along the flow direction of the high-temperature mixed gas. The uppermost planar serpentine section 22 is connected to the inflow section 21, and the lowermost planar serpentine section 22 is connected to the outflow section 24. The connecting section 23 is arc-shaped and is used to connect two adjacent planar serpentine sections 22. The inflow section 21 and the outflow section 24 are welded and fixed to the outer shell 1 and extend out of the outer shell 1. Multiple fins 3 are arranged in a row and fixed to the straight sections of the multiple planar serpentine sections 22. At the same time, the cross-sectional inner cavity areas of the first pipe 11 and the second pipe 12 are the same and are set as A1. The cross-sectional inner cavity area of ​​the outer shell 1 is set as A2. The top-view projection area of ​​the base pipe 2 and the multiple fins 3 is set as A3, satisfying A2-A3>A1.

[0032] like Figure 1 and Figure 2 As shown, the cooling water inlet connector 4 and the cooling water outlet connector 5 are compression fittings.

[0033] Implementation effect: The high-temperature mixed gas enters the shell along the first pipe 11 and exits along the second pipe 12. During the flow of the high-temperature mixed gas, heat is transferred to the fins 3 through thermal convection. The fins 3 transfer heat to the coolant in the base tube 2 through thermal conduction. The coolant carries away the heat, thereby reducing the temperature of the mixed gas. The high-temperature mixed gas after heat exchange flows out from the second pipe 12. Furthermore, by making the cross-sectional area of ​​the first pipe 11 and the second pipe 12 the same and set as A1, the cross-sectional area of ​​the shell 1 set as A2, and the top-view projection area of ​​the base tube 2 and multiple fins 3 set as A3, A2-A3>A1 is satisfied, thereby ensuring that the cross-sectional area of ​​the radiator gap is greater than the cross-sectional area of ​​the first pipe 11 and the second pipe 12, effectively controlling the gas flow resistance of the high-temperature mixed gas. At the same time, since the radiator needs to be integrated in the vacuum pipe, the shell 1 is made of stainless steel plate welded into shape, thereby ensuring the high airtightness and pressure resistance of the radiator. The cooling water inlet connector 4 and the cooling water outlet connector 5 adopt compression fittings, thereby achieving convenient connection.

[0034] Multiple planar serpentine segments 22 are arranged along the flow direction of the high-temperature mixed gas, and connecting segments 23 are used to connect two adjacent planar serpentine segments 22. This is equivalent to folding the continuous serpentine tube back and forth in the vertical direction to extend the length of the base tube 2 within a limited space, thereby increasing the flow time and path of the cooling water and allowing sufficient time for heat exchange. Each fin 3 is fixed to the straight portion of the multiple planar serpentine segments 22, so that each fin 3 is connected to multiple planar serpentine segments 22, thereby improving heat exchange efficiency. At the same time, during the arrangement of the base tube 2 and fins 3, there is a cavity along the height direction of the outer shell 1, which can reduce the flow resistance of the high-temperature mixed gas. This radiator needs to be integrated into the vacuum pipeline. The full penetration weld structure effectively eliminates the micropores or gaps that may be caused by incomplete penetration welding, thereby ensuring the high airtightness of the outer shell 1 under vacuum conditions.

[0035] Example 2: A finned heat sink for a high-power CO2 axial fast-flow laser, such as Figure 5 As shown, the difference from Embodiment 1 is that a dispersion shroud 6 is provided inside the lower end of the outer shell 1, which communicates with the first pipe 11 and has multiple dispersion channels 61 for dispersing the high-temperature mixed gas. The multiple dispersion channels 61 are respectively aligned with the cavities between two adjacent fins 3. At the same time, a conical shroud 7 is provided inside the upper end of the outer shell 1, which communicates with the second pipe 12 and guides the high-temperature mixed gas to be discharged. The diameter of the conical shroud 7 decreases along the direction towards the second pipe 12, and the diameter of the upper end of the conical shroud 7 is the same as the diameter of the second pipe 12. The lower end of the conical shroud 7 is welded to the inner wall of the shell, and multiple guide vanes 71 arranged in a circumferential array are provided inside the conical shroud 7.

[0036] Implementation effect: The high-temperature mixed gas entering the shell from the first pipe 11 can be discharged from multiple dispersion channels 61 under the action of the dispersion shroud 6, thereby improving the uniformity of heat exchange during the contact between the high-temperature mixed gas and the bottom of the base pipe 2 and fins 3. During the process of the high-temperature mixed gas entering the second pipe 12 from the outer shell 1 after heat exchange, the conical shroud 7 guides and gathers the high-temperature mixed gas, preventing it from colliding with the top of the outer shell 1 and causing airflow turbulence. Multiple guide vanes 71 arranged in a circumferential array can guide and organize the high-temperature mixed gas, avoiding airflow turbulence.

Claims

1. A finned heat sink for a high-power CO2 axial fast-flow laser, comprising a housing (1), a base tube (2) disposed within the housing (1), and a plurality of fins (3) disposed on the base tube (2), wherein a first pipe (11) for high-temperature mixed gas to flow into is disposed at the bottom of the housing (1), and a second pipe (12) for high-temperature mixed gas to flow out after heat exchange is disposed at the top of the housing (1), wherein the two ends of the base tube (2) extend above and below the side of the housing (1), respectively, and a cooling water inlet connector (4) is disposed at the lower end of the base tube (2) extending below the side of the housing (1), and a cooling water outlet connector (5) is disposed at the upper end of the base tube (2) extending above the side of the housing (1), characterized in that: The cross-sectional inner cavity areas of the first pipe (11) and the second pipe (12) are the same and are set as A1. The cross-sectional inner cavity area of ​​the outer shell (1) is set as A2. The top-view projection area of ​​the base pipe (2) and the multiple fins (3) is set as A3, satisfying A2-A3>A1; The outer shell (1) is formed by welding stainless steel plate. The two ends of the base pipe (2) are welded and fixed to the outer shell (1). The cooling water inlet connector (4) and cooling water outlet connector (5) are compression fittings.

2. The finned heat sink for a high-power CO2 axial fast-flow laser according to claim 1, characterized in that: The base pipe (2) includes an inflow section (21), multiple planar serpentine sections (22), multiple connecting sections (23), and an outflow section (24). The multiple planar serpentine sections (22) are arranged along the flow direction of the high-temperature mixed gas. The uppermost planar serpentine section (22) is connected to the inflow section (21), and the lowermost planar serpentine section (22) is connected to the outflow section (24). The connecting section (23) is used to connect two adjacent planar serpentine sections (22). The inflow section (21) and the outflow section (24) are welded and fixed to the outer shell (1) and extend out of the outer shell (1).

3. The finned heat sink for a high-power CO2 axial fast-flow laser according to claim 2, characterized in that: Multiple fins (3) are arranged in a row and fixed to the straight sections of multiple planar serpentine segments (22) for each fin (3).

4. The finned heat sink for a high-power CO2 axial fast-flow laser according to claim 1, characterized in that: The weld seam of the outer shell (1) is a full penetration weld structure.

5. A finned heat sink for a high-power CO2 axial fast-flow laser according to claim 1, characterized in that: The lower end of the outer shell (1) is provided with a dispersion hood (6) that communicates with the first pipe (11) and has multiple dispersion channels (61) for dispersing high-temperature mixed gas.

6. A finned heat sink for a high-power CO2 axial fast-flow laser according to claim 5, characterized in that: The upper end of the outer shell (1) is provided with a conical hood (7) that communicates with the second pipe (12) and guides the high-temperature mixed gas to be discharged. The diameter of the conical hood (7) decreases along the direction toward the second pipe (12).

7. A finned heat sink for a high-power CO2 axial fast-flow laser according to claim 6, characterized in that: The upper diameter of the conical cover (7) is the same as that of the second pipe (12). The lower end of the conical cover (7) is welded to the inner wall of the shell. Multiple guide vanes (71) arranged in a circumferential array are provided inside the conical cover (7).

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