Laser output head based on water-cooling heat dissipation

Abstract

The invention discloses a laser output head based on water-cooling heat dissipation, and belongs to the technical field of lasers, the laser output head comprises a main body sleeve, and a main body end, a water-cooling center insert, a water inlet assembly and a water outlet assembly which are assembled on the main body sleeve, and two water-cooling cavities in the periphery of the water-cooling center insert and cooling grooves in the periphery of the main body end are correspondingly arranged; and the water inlet / outlet assembly is arranged relative to the water-cooling center insert, so that a U-shaped water-cooling path can be formed in the laser output head, water-cooling heat dissipation of the laser output head is effectively realized, and the use safety of the laser output head is ensured. The laser output head is compact in structure and convenient to disassemble and assemble, a water-cooling heat dissipation system which is long in heat dissipation path and high in heat exchange efficiency can be provided for the laser output head, the heat dissipation efficiency of the laser output head is improved, it is guaranteed that the temperature of an inner cavity of the laser output head is kept within a reliable range all the time, and the service life of the laser output head is prolonged; the use safety and reliability of the laser output head are guaranteed, and the laser output head has good practical value.

Description

Technical Field

[0001] This invention belongs to the field of laser technology, specifically relating to a laser output head based on water cooling. Background Technology

[0002] With the continuous development of laser processing technology, the research and application of high-power lasers have become increasingly mature and have been widely used in many industrial laser processing scenarios.

[0003] For existing high-power continuous lasers, the output head typically uses fiber optic splices with quartz end caps to form the output device for power beam amplification and transmission to the cutting head for collimation and focusing. However, under high-power output conditions, high-energy reflected light is generated during laser cutting due to reflection. This reflected light usually returns in a straight line to the output head; part of the light returns to the crystal and is absorbed by the inner wall of the structural component, generating heat, while the other part returns along the fiber transmission direction. With the continuous increase in the power of continuous lasers, especially high-power lasers of 10,000 watts and above, the reflected light generated during processing carries a large amount of energy. When cutting and welding highly reflective materials, the output head often overheats, triggering the thermal protection boundary condition and causing the laser to stop abruptly. In severe cases of overheating, the output head assembly may even be burned out, greatly affecting the lifespan of the laser system and components, and limiting the application of the laser.

[0004] Although various cooling methods have been proposed for continuous laser applications in the existing technology, which have alleviated the defects caused by overheating of the laser output head to some extent, the cooling components designed for continuous lasers in the existing technology often have limited cooling effect and cannot achieve sufficient cooling of the various components of the laser output head, thus having certain application limitations. Summary of the Invention

[0005] In response to one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a water-cooled laser output head that can meet the requirements of high-power laser output while quickly dissipating the heat of the returned light returning to the output head, greatly reducing the heat dissipation pressure of the output optical cable on the returned light, extending the service life of the laser output head, and ensuring the safe operation of the laser system.

[0006] To achieve the above objectives, the present invention provides a laser output head based on water cooling, comprising a main sleeve with a receiving cavity, a main end assembly, a water cooling center insert, a water inlet assembly, and a water outlet assembly assembled in the main sleeve; The main body end is embedded in one end of the receiving cavity; one end of the water-cooled center insert is embedded in the main body end, and the other end is embedded in the other end of the receiving cavity; and the main body sleeve has an inlet assembly hole and an outlet assembly hole respectively connected to the receiving cavity at the end opposite to the main body end. The water-cooled center insert has a central through hole, and its outer periphery has two opposing sides forming an independent first water-cooled cavity and a second water-cooled cavity; each water-cooled cavity includes multiple independent chambers arranged circumferentially and not connected circumferentially. The main body end is embedded in the receiving cavity and has multiple first cooling grooves spaced upward around the outer circumference, and a second cooling groove is provided along the circumferential direction; each first cooling groove is connected to the second cooling groove at one end, and the other end of some first cooling grooves is connected to the first water cooling cavity, while the other end of the remaining first cooling grooves is connected to the second water cooling cavity. The water inlet assembly is mounted on the water inlet assembly hole and communicates with the first water cooling cavity; the water outlet assembly is mounted on the water outlet assembly hole and communicates with the second water cooling cavity; the output optical fiber is inserted into the central through hole from one end of the water cooling central insert away from the main body and is connected to the laser output quartz crystal installed at the other end of the water cooling central insert.

[0007] As a further improvement of the present invention, a fin assembly is provided on the outer periphery of the water-cooled central insert; The fin assembly includes two first partition fins disposed on opposite sides of the outer periphery of the water-cooling center insert, and a plurality of second partition fins disposed circumferentially between the two first partition fins; each partition fin extends axially and abuts against the inner wall of the receiving cavity with its outer edge; the length of the first partition fin is greater than the length of the second partition fin, and the two first partition fins separate two water-cooling cavities, and the two water-cooling cavities are each separated into multiple independent chambers by the second partition fins; and each water-cooling cavity has an arc-shaped cavity disposed circumferentially at one end opposite to the main body end, and each arc-shaped cavity is connected to each independent chamber in a single water-cooling cavity, and the water inlet assembly hole and the water outlet assembly hole are respectively connected to the two arc-shaped cavities.

[0008] As a further improvement of the present invention, one end of the output optical fiber connected to the laser output quartz crystal is a bare fiber with the coating removed, and a thread is formed on the inner wall surface of the bare fiber opposite to the central through hole.

[0009] As a further improvement of the present invention, the length of the bare fiber is 60mm~80mm; and / or The inner diameter of the central through-hole facing the bare fiber is 3.5mm~4.5mm.

[0010] As a further improvement of the present invention, the inner hole of the main body end is configured as a variable diameter stepped hole, with the end opposite to the water-cooled center insert being the large diameter end and the end assembled with the water-cooled center insert being the small diameter end, and the second cooling groove being located on the outer periphery of the large diameter end.

[0011] As a further improvement of the present invention, the water-cooled center insert is made of copper, and the main body end is made of stainless steel.

[0012] As a further improvement of the present invention, a reflective column is provided at the end of the central through hole away from the laser output quartz crystal; The reflective column is embedded in the central through hole, and a through hole for the output optical fiber is opened in the middle. The end of the reflective column facing the main body is provided with a coated reflective surface.

[0013] As a further improvement of the present invention, a temperature sensing component is also connected to one end of the water-cooled center insert away from the main body end, for real-time monitoring of the internal cavity temperature of the laser output head.

[0014] As a further improvement of the present invention, each water-cooling cavity is provided with an arc-shaped cavity along the circumferential direction on the side near the main body end, which connects all the independent chambers in the water-cooling cavity, so that each first cooling tank is connected to the corresponding water-cooling cavity through the arc-shaped cavity.

[0015] As a further improvement of the present invention, the two water-cooling cavities are located on the outer periphery of the middle part of the water-cooling center insert, and sealing assembly holes are respectively provided on the outer periphery of both ends of the water-cooling center insert in a circumferential direction, so that one end of the water-cooling center insert is sealed and assembled with the inner wall surface of the main body end through a sealing ring, and the other end is sealed and assembled with the inner wall surface of the main body sleeve through a sealing ring.

[0016] As a further improvement of the present invention, a locking sleeve is connected to one end of the main sleeve that is away from the end of the main body; and / or A decorative protective sleeve is also fitted around the outer periphery of the main sleeve.

[0017] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0018] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include: The water-cooled laser output head of this invention includes a main sleeve and a main end assembly, a water-cooled central insert, a water inlet assembly, and a water outlet assembly mounted on the main sleeve. By utilizing the corresponding arrangement of the fin assembly on the outer periphery of the water-cooled central insert and the cooling groove on the outer periphery of the main end assembly, and the arrangement of the water inlet / outlet assembly relative to the water-cooled central insert, a U-shaped water-cooling path can be formed inside the laser output head. Combined with the corresponding arrangement of the fin assembly, the arc-shaped cavity, and the cooling groove, water-cooling heat dissipation of the laser output head can be effectively achieved, ensuring the efficiency of water-cooling heat dissipation, avoiding overload of the internal temperature of the laser output head, and ensuring the safety and reliability of the laser output head in use.

[0019] Furthermore, by opening the coating layer at the end of the transmission optical fiber, setting the heat dissipation threaded section in the central through hole, designing the inner diameter of the heat dissipation threaded section, and / or setting the reflector, the heat dissipation efficiency of the inner cavity of the laser output head can be further improved, achieving efficient removal of cladding light and reflected light, reducing the impact of cladding light on laser processing and the impact of reflected light on the temperature rise of the tail end device of the laser output head, and further improving the water cooling effect of the laser output head.

[0020] The water-cooled laser output head of this invention has a compact structure and is easy to assemble and disassemble. It provides a water-cooled heat dissipation system with a long heat dissipation path and high heat exchange efficiency, effectively improving the heat dissipation efficiency of the laser output head, ensuring that the internal temperature of the laser output head is always maintained within a reliable range, extending the service life of the laser output head, and ensuring the safety and reliability of the laser output head. It has good practical value. Attached Figure Description

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

[0022] Figure 1 This is a cross-sectional view of the overall structure of the laser output head based on water cooling in an embodiment of the present invention; Figure 2 This is a schematic diagram of the main sleeve structure of the laser output head based on water cooling in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the main sleeve of the laser output head in an embodiment of the present invention; Figure 4 This is a schematic diagram of the main end structure of the laser output head based on water cooling in an embodiment of the present invention; Figure 5 This is a side view of the main body end of the laser output head in an embodiment of the present invention; Figure 6 This is a cross-sectional view of the main body end of the laser output head in an embodiment of the present invention; Figure 7 , Figure 8 This is a schematic diagram of the structure of the water-cooled central insert of the laser output head in an embodiment of the present invention; Figure 9 , Figure 10 This is a cross-sectional view of the water-cooled central insert of the laser output head in an embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of the decorative protective sleeve covering the outer periphery of the laser output head in an embodiment of the present invention; Figures 12-14 These are cross-sectional views of the laser output head in various directions after the decorative protective sleeve is fitted in an embodiment of the present invention. In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Main body sleeve; 2. Main body end; 3. Water-cooled center insert; 4. Water inlet assembly; 5. Water outlet assembly; 6. Temperature sensing assembly; 7. Transmission optical cable; 8. Output optical fiber; 9. Reflector column; 10. Laser output quartz crystal; 11. Locking sleeve; 12. Decorative protective sleeve; 101. First assembly section; 102. Second assembly section; 103. Water inlet assembly hole; 104. Water outlet assembly hole; 201. First cooling tank; 202. Second cooling tank; 203. Alignment assembly hole; 301. Central through hole; 3011. Heat dissipation threaded section; 3012. Crystal assembly section; 3013. Temperature measurement mounting section; 302. First partition fin; 303. Second partition fin; 304. First arc-shaped cavity; 305. Second arc-shaped cavity; 306. Annular baffle; 307. Sealing assembly hole; 801, Coating Peeling Section; 901, Coated Reflective Surface; 1001, Crystal End Cap. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0024] In the description of this invention, it should be understood that, unless otherwise expressly specified and limited, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0025] Furthermore, unless otherwise expressly defined, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

[0026] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] Below, for reference Figures 1-14 A water-cooled laser output head according to a preferred embodiment of the present invention is described.

[0029] For the laser output head in the preferred embodiment, the design aims to incorporate a cooling component to ensure that the internal temperature of the laser output head does not exceed the allowable range for safe operation of the device during use, thereby extending the service life of the laser output head and ensuring the safe operation of the laser system.

[0030] Specifically, such as Figure 1 As shown, in a preferred embodiment of the present invention, a laser output head based on water cooling includes a main sleeve 1 with a receiving cavity, a main end 2 assembled on the main sleeve 1, a water cooling center insert 3, a water inlet assembly 4, and a water outlet assembly 5.

[0031] like Figure 2 , Figure 3As shown, the receiving cavity of the main sleeve 1 includes a first assembly section 101 and a second assembly section 102 arranged coaxially. The first assembly section 101 is used to embed the main body end 2, and its inner diameter is larger than that of the second assembly section 102. In actual installation, the first assembly section 101 and the second assembly section 102 are smoothly transitioned through a tapered diameter section. Meanwhile, the second assembly section 102 is used to embed the water-cooled center insert 3, and a water inlet assembly hole 103 and a water outlet assembly hole 104 communicating with the second assembly section 102 are opened at the end of the main sleeve 1 opposite to the first assembly section 101, to facilitate the assembly of the water inlet assembly 4 and the water outlet assembly 5.

[0032] Furthermore, the water-cooled central insert 3 has a central through hole 301 for the output optical fiber 8 to pass through, such as... Figure 9 , Figure 10 As shown in the figure, one end of the water-cooled central insert 3 is fitted with a laser output quartz crystal 10 and sealed and embedded in the main body end 2, while the other end is embedded in the second assembly section 102 and has a fin assembly on its outer periphery.

[0033] Specifically, the fin assembly is disposed on the outer periphery of the middle part of the water-cooled central insert 3, and includes first partition fins 302 disposed on opposite sides of the outer periphery of the water-cooled central insert 3 and a plurality of second partition fins 303 disposed circumferentially between the two first partition fins 302. Each partition fin extends axially and abuts against the inner wall surface of the second assembly section 102 with its outer edge, that is, the outer diameter of each partition fin matches (is equal to or slightly smaller than) the inner diameter of the second assembly section 102. At the same time, the length of the first partition fins 302 is greater than the length of the second partition fins 303, and the two first partition fins 302 separate two independent water-cooling cavities on the outer periphery of the water-cooled central insert 3, and the two water-cooling cavities are respectively divided by the second partition fins 303 into a plurality of independent chambers arranged circumferentially, such as... Figure 13 As shown in the figure. In addition, each water-cooling cavity has an arc-shaped cavity arranged circumferentially at the end opposite to the main body end 2, namely the first arc-shaped cavity 304 and the second arc-shaped cavity 305. Each arc-shaped cavity is connected to the independent chambers in a single water-cooling cavity, ensuring that the cooling water in the first arc-shaped cavity 304 can enter the independent chambers, and that the cooling water in the independent chambers of the other water-cooling cavity can all be collected in the second arc-shaped cavity 305.

[0034] More specifically, the structure of the main body end 2 is as follows: Figures 4-6 As shown, one end of the device is embedded in the first assembly section 101, and a plurality of first cooling grooves 201 are spaced apart around its outer periphery, and a second cooling groove 202 is provided along the circumferential direction. Each first cooling groove 201 is connected to the second cooling groove 202 at one end, and the other end of some first cooling grooves 201 is connected to one of the water-cooling chambers, while the other end of the remaining first cooling grooves 201 is connected to another water-cooling chamber.

[0035] In addition, the water inlet assembly 4 is mounted on the water inlet assembly hole 103, and the water outlet assembly 5 is mounted on the water outlet assembly hole 104, so that the water inlet assembly 4 is connected to one of the arc-shaped cavities (i.e., the first arc-shaped cavity 304), and the water outlet assembly 5 is connected to the other arc-shaped cavity (i.e., the second arc-shaped cavity 305); the output optical fiber 8 extends from the end of the water-cooled central insert 3 away from the main body end 2 into the central through hole 301 and is connected to the crystal end cap 1001 of the laser output quartz crystal 10.

[0036] By utilizing the aforementioned combination of the main body sleeve 1, the main body end 2, and the water-cooled central insert 3 in the preferred embodiment, especially the combination of the outer peripheral fin assembly of the water-cooled central insert 3 and the outer peripheral cooling groove of the main body end 2, a "U-shaped" water-cooled heat dissipation channel can be formed in the laser output head after the main body end 2 and the water-cooled central insert 3 are assembled in the main body sleeve 1. This channel extends from the end of the water-cooled central insert 3 away from the main body end 2 to the outer periphery of the main body end 2, which can fully realize water-cooled heat dissipation in the area where the laser output head may generate high temperature environment.

[0037] More importantly, in the preferred embodiment, based on the radial length of each segmented fin on the outer periphery of the water-cooled central insert 3 and the arrangement of the two arc-shaped cavities, the water-cooling cavity is divided into multiple independent chambers by the second segmented fin 303. This ensures that the cooling liquid must be transported through these independent chambers, guaranteeing sufficient contact between the cooling liquid and each segmented fin during transport. This increases the heat conduction area of ​​the cooling liquid and avoids the poor cooling effect caused by the cooling liquid merely skimming over the outermost edge of the water-cooled central insert 3. Simultaneously, the corresponding arrangement of the cooling grooves on the outer periphery of the main body end 2 relative to each water-cooling cavity significantly extends the transport path of the cooling liquid, thereby providing targeted heat dissipation to the core heat-generating area of ​​the laser output head and fully ensuring the water-cooling heat dissipation effect of the laser output head.

[0038] In addition, the laser output head in the preferred embodiment adopts an assembled and separable design of the main body end 2 and the water-cooled central insert 3, which not only simplifies the difficulty of integral processing of the internal components of the laser output head, but also facilitates the replacement of faulty parts of the laser output head in the later stage, thereby reducing the application and maintenance costs of the laser output head.

[0039] Furthermore, based on the assembled and separable design of the main body end 2 and the water-cooled central insert 3 in the laser output head, the heat dissipation effect of the laser output head can be further improved through the material design of the two.

[0040] Specifically, considering that the end of the laser output head needs to ensure a certain rigidity, the main end 2 is best made of a material with a hard texture and strong rigidity; as for the water-cooled central insert 3, the output optical fiber 8 is inserted in the middle, which has a relatively weaker tolerance to high temperature and a greater demand for heat dissipation performance.

[0041] Therefore, in a preferred embodiment, the main body end 2 is preferably made of stainless steel to ensure the end rigidity of the laser output head, and the water-cooled center insert 3 is preferably made of copper, which has a higher thermal conductivity and can complete the conduction and cooling of high temperature in the cavity more quickly, avoiding excessive temperature in the cavity, and preventing heat from being transferred to the end of the water-cooled center insert 3 away from the main body end 2 through rapid heat conduction, thus ensuring the reliability of the components in the tail end of the laser output head.

[0042] Clearly, the separable design of the main body end 2 and the water-cooled center insert 3 facilitates the material design of the aforementioned two components and further promotes the improvement of the heat dissipation efficiency of the laser output head.

[0043] Furthermore, in actual setup, it is preferable to set one end of the output optical fiber 8 connected to the laser output quartz crystal 10 as a bare fiber with the coating removed, i.e., as shown below. Figure 1 The coating peeling section 801 shown is illustrated.

[0044] By stripping the outer coating of the output fiber 8 in the coating stripping section 801, the output fiber 8 can filter out residual pump light (i.e. cladding light) when transmitting laser to the laser output quartz crystal 10. The heat generated by the pump light is quickly absorbed by the hole wall of the water-cooled central insert 3 and then dissipated, thus avoiding excessive temperature in the bare fiber area.

[0045] Furthermore, in practical applications, when the laser output head uses laser for processing, some laser light is reflected back into the laser output head. Some of the heat from this reflected light is dissipated by the cooling water after heat exchange with the end and inner wall of the main body end 2 and the end and inner wall of the water-cooled central insert 3. However, some of the reflected light is directly reflected back to the laser output quartz crystal 10 and transmitted back to the output optical fiber 8. In this case, based on the aforementioned bare fiber configuration, the radiation of the reflected light energy in the bare fiber area can be accelerated, achieving the removal of most of the reflected light and preventing the reflected light energy from being conducted to the rear end of the output optical fiber 8, thus ensuring the safety and reliability of the rear-end components of the laser output head.

[0046] More specifically, in order to further improve the heat conduction efficiency of the water-cooled central insert 3 to the bare fiber area, it is preferable to have threads on the inner wall surface of the central through hole 301 facing the bare fiber, thereby increasing the heat radiation heat exchange area of ​​the area facing the bare fiber, further improving the heat dissipation efficiency in the central through hole 301, improving the heat dissipation effect of the laser output head, and fully ensuring that the cavity temperature of the central through hole 301 will not be overloaded.

[0047] In practical applications, the length of the bare fiber is preferably 60mm to 80mm. If the fiber is too long, it may protrude beyond the central through-hole 301 of the water-cooled central insert 3 and break due to insufficient support, or it may increase the length of the water-cooled central insert 3, thus increasing equipment costs. Conversely, if the fiber is too short, its stripping efficiency for cladding light and returned light will be low, causing most of the heat from the returned light to return along the cladding to the laser's interior, potentially damaging the equipment.

[0048] Therefore, in the preferred embodiment, by setting the length of the bare fiber, the reliability of the output fiber 8 setting can be guaranteed, and a large amount of cladding light and return light can be stripped away, so as to achieve rapid heat dissipation in the fiber area and ensure the safety of the output fiber 8 setting and operation.

[0049] Furthermore, in the preferred embodiment, the central through-hole 301 includes a heat dissipation threaded section 3011 and a crystal assembly section 3012. The former is positioned directly opposite the bare fiber and its length is not less than the length of the bare fiber. The latter is used to assemble the laser output quartz crystal 10 and is generally designed as a variable diameter hole to facilitate the embedding and installation of the laser output quartz crystal 10. For high-power lasers, the outer diameter of the laser output quartz crystal 10 is typically 16mm. To reduce the proportion of reflected light entering the central through-hole 301, the inner diameter of the heat dissipation threaded section 3011 is further designed in the preferred embodiment. If the inner diameter of the heat dissipation threaded section 3011 is too large, it will increase the proportion of reflected light entering the inner cavity, which is not conducive to controlling the cavity temperature in the water-cooled central insert 3. If the inner diameter of the heat dissipation threaded section 3011 is too small, it will significantly reduce the heat exchange area of ​​the inner wall of the central through-hole 301, affecting the heat exchange efficiency of the water-cooled central insert 3.

[0050] Therefore, in the preferred embodiment, the inner diameter of the heat dissipation threaded section 3011 is specifically designed, that is, the inner diameter of the central through hole 301 (i.e., the heat dissipation threaded section 3011) facing the bare fiber is 3.5mm to 4.5mm, and more preferably 4mm.

[0051] In addition, in actual installation, the inner hole of the main body end 2 is preferably set as a variable diameter stepped hole, with the end facing away from the water-cooled center insert 3 being the large diameter end and the end that assembles the water-cooled center insert 3 being the small diameter end, and the second cooling groove 202 being located on the outer periphery of the large diameter end.

[0052] This configuration allows the reflected light to act as much as possible on the inner peripheral wall of the main body end 2 during transmission, reducing the proportion of reflected light transmitted to the laser output quartz crystal 10 and the output optical fiber 8.

[0053] More preferably, in order to ensure that the energy of the reflected light is transferred within the central through-hole 301 as much as possible, a reflective column 9 is preferably provided at the end of the central through-hole 301 away from the laser output quartz crystal 10.

[0054] like Figure 1 As shown, the reflector column 9 is embedded in the central through hole 301, with a through hole in its middle for the output optical fiber 8 to pass through. The output optical fiber 8, with its coating not removed, passes through the reflector column 9 and extends axially. At the same time, a coated reflective surface 901 is provided at the end of the reflector column 9 facing the main body end 2, so that the reflected light transmitted to the reflector column 9 can be reflected back to the inner cavity where the heat dissipation thread section 3011 is located by the coated reflective surface 901, and then quickly heat-exchanged by the water cooling system, effectively preventing the heat of the reflected light from being transferred to the rear end device of the laser output head.

[0055] Furthermore, a temperature measuring installation section 3013 is preferably provided at the end of the central through hole 301 away from the main body end 2, and a temperature sensing component 6 is connected to the end of the water-cooled central insert 3 away from the main body end 2 for real-time monitoring of the internal cavity temperature of the laser output head.

[0056] As an example, the temperature sensing component 6 is threaded onto the temperature measurement mounting section 3013, which preferably includes a thermal sensing connection post and a thermistor disposed on the thermal sensing connection post. The positive and negative terminals of the thermistor are connected to a test circuit, and the temperature inside the cavity is determined by detecting the resistance of the thermistor. For example, in a preferred embodiment, a thermistor resistance of 10KΩ corresponds to 20℃; a resistance of 9KΩ corresponds to 25℃; a resistance of 8KΩ corresponds to 30℃, and so on, allowing for real-time detection of the cavity temperature. Combined with the high thermal conductivity of the water-cooled central insert 3 (made of copper) and the thermistor, the temperature feedback inside the laser output head cavity can be quickly completed, thereby setting the corresponding temperature alarm threshold. This enables the laser output head to have the capability of temperature overload detection, fully ensuring the safety and reliability of the laser processing system application.

[0057] Furthermore, preferably, an arc-shaped cavity connecting all the independent chambers in the water-cooling cavity is also provided circumferentially on the side of the water-cooling cavity near the main body end 2, such as... Figure 7 , Figure 8 As shown, each of the first cooling tanks 201 is connected to the corresponding water-cooling cavity through an arc-shaped cavity, ensuring the uniformity of cooling water transmission and ensuring the consistency of water-cooled heat conduction in each area of ​​the main body end 2 and the water-cooled center insert 3.

[0058] More specifically, to ensure the sealing of both ends of the water-cooling cavity, it is preferable to provide annular baffles 306 along the circumferential direction at both ends of the water-cooling cavity, such as... Figure 7 , Figure 8As shown in the figure, the outer diameter of the two annular baffles 306 is the same as the inner diameter of the main body end 2 and the inner diameter of the second assembly section 102, which fully ensures the separation between the water-cooling cavity and the two ends of the water-cooling center insert 3.

[0059] In actual installation, the two water-cooling cavities are located on the outer periphery of the middle part of the water-cooling central insert 3, and sealing assembly holes 307 are respectively opened circumferentially on the outer periphery of both ends of the water-cooling central insert 3, so that one end of the water-cooling central insert 3 is sealed and assembled with the inner wall surface of the main body end 2 through a sealing ring, and the other end is sealed and assembled with the inner wall surface of the main body sleeve 1 through a sealing ring, such as... Figure 1 As shown in the image.

[0060] In addition, in order to fix the end of the transmission optical cable 7 and close the end of the main body sleeve 1, it is preferable to connect and install a locking sleeve 11 at the end of the main body sleeve 1 away from the main body end 2.

[0061] Based on the setting of the locking sleeve 11, the aforementioned temperature sensing component 6 can be sealed in the locking sleeve 11, and a reliable connection of the end of the transmission optical cable 7 can be achieved.

[0062] More preferably, a decorative protective sleeve 12 is also fitted around the outer periphery of the main sleeve 1, such as... Figures 12-14 As shown, it provides protection for the outer periphery of the main sleeve 1 on the one hand, and provides a carrier for the installation of relative components (such as the installation of switches) on the other hand.

[0063] In actual installation, it is preferable to have mounting holes on the outer periphery of the decorative protective sleeve 12, the main body end 2, and the water-cooled central insert 3, for example... Figure 4 The alignment and assembly holes 203 shown on the main body end 2 are aligned coaxially after the assembly of each component is completed. At this time, the connection and assembly between the components can be completed by connecting screws. This is a mature technology and will not be described in detail here.

[0064] The water-cooled laser output head of this invention has a compact structure and is easy to assemble and disassemble. It provides a water-cooled heat dissipation system with a long heat dissipation path and high heat exchange efficiency, effectively improving the heat dissipation efficiency of the laser output head, ensuring that the internal temperature of the laser output head is always maintained within a reliable range, extending the service life of the laser output head, and ensuring the safety and reliability of the laser output head. It has good practical value.

[0065] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A laser output head based on water cooling, characterized in that, It includes a main sleeve with a receiving cavity, a main end assembly, a water-cooled central insert, a water inlet assembly, and a water outlet assembly assembled on the main sleeve; The main body end is embedded in one end of the receiving cavity; one end of the water-cooled center insert is embedded in the main body end, and the other end is embedded in the other end of the receiving cavity; and the main body sleeve has an inlet assembly hole and an outlet assembly hole respectively connected to the receiving cavity at the end opposite to the main body end. The water-cooled center insert has a central through hole, and its outer periphery has two opposing sides forming an independent first water-cooled cavity and a second water-cooled cavity; each water-cooled cavity includes multiple independent chambers arranged circumferentially and not connected circumferentially. The main body end is embedded in the receiving cavity and has multiple first cooling grooves spaced upward around the outer circumference, and a second cooling groove is provided along the circumferential direction; each first cooling groove is connected to the second cooling groove at one end, and the other end of some first cooling grooves is connected to the first water cooling cavity, while the other end of the remaining first cooling grooves is connected to the second water cooling cavity. The water inlet assembly is mounted on the water inlet assembly hole and communicates with the first water cooling cavity; the water outlet assembly is mounted on the water outlet assembly hole and communicates with the second water cooling cavity; the output optical fiber is inserted into the central through hole from one end of the water cooling central insert away from the main body and is connected to the laser output quartz crystal installed at the other end of the water cooling central insert.

2. The laser output head based on water cooling according to claim 1, characterized in that, The outer periphery of the water-cooled central insert is provided with a fin assembly; The fin assembly includes two first partition fins disposed on opposite sides of the outer periphery of the water-cooling center insert, and a plurality of second partition fins disposed circumferentially between the two first partition fins; each partition fin extends axially and abuts against the inner wall of the receiving cavity with its outer edge; the length of the first partition fin is greater than the length of the second partition fin, and the two first partition fins separate two water-cooling cavities, and the two water-cooling cavities are each separated into multiple independent chambers by the second partition fins; and each water-cooling cavity has an arc-shaped cavity disposed circumferentially at one end opposite to the main body end, and each arc-shaped cavity is connected to each independent chamber in a single water-cooling cavity, and the water inlet assembly hole and the water outlet assembly hole are respectively connected to the two arc-shaped cavities.

3. The laser output head based on water cooling according to claim 1, characterized in that, The output optical fiber is a bare fiber with the coating removed at one end, and a thread is formed on the inner wall surface of the bare fiber opposite the central through hole.

4. The laser output head based on water cooling according to claim 3, characterized in that, The length of the bare fiber is 60mm~80mm; and / or The inner diameter of the central through-hole facing the bare fiber is 3.5mm~4.5mm.

5. The laser output head based on water cooling according to any one of claims 1 to 4, characterized in that, The inner hole of the main body end is set in the form of a variable diameter stepped hole, with the end opposite to the water-cooled center insert being the large diameter end and the end assembled with the water-cooled center insert being the small diameter end, and the second cooling groove being located on the outer periphery of the large diameter end.

6. The laser output head based on water cooling according to any one of claims 1 to 4, characterized in that, The water-cooled central insert is made of copper, and the main body end is made of stainless steel. and / or A reflective column is provided at the end of the central through hole away from the laser output quartz crystal; the reflective column is embedded in the central through hole, and a through hole for the output optical fiber is opened in the middle, and a coated reflective surface is provided at the end of the reflective column facing the main body.

7. The laser output head based on water cooling according to any one of claims 1 to 4, characterized in that, The end of the water-cooled center insert facing away from the main body is also connected to a temperature sensing component for real-time monitoring of the internal temperature of the laser output head.

8. The laser output head based on water cooling according to any one of claims 1 to 4, characterized in that, Each water-cooling cavity has an arc-shaped cavity along the circumferential direction on the side near the main body end, which connects all the independent chambers in the water-cooling cavity, so that each first cooling tank is connected to the corresponding water-cooling cavity through the arc-shaped cavity.

9. The laser output head based on water cooling according to any one of claims 1 to 4, characterized in that, The two water-cooling cavities are located on the outer periphery of the middle part of the water-cooling center insert, and sealing assembly holes are respectively opened circumferentially on the outer periphery of both ends of the water-cooling center insert, so that one end of the water-cooling center insert is sealed and assembled with the inner wall surface of the main body end through a sealing ring, and the other end is sealed and assembled with the inner wall surface of the main body sleeve through a sealing ring.

10. The laser output head based on water cooling according to any one of claims 1 to 4, characterized in that, A locking sleeve is connected to the end of the main sleeve that is away from the main body end; and / or A decorative protective sleeve is also fitted around the outer periphery of the main sleeve.

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