Liquid cooling device for lath laser amplifier crystal

Abstract

The invention relates to the technical field of lasers, in particular to a liquid cooling device for a lath laser amplifier crystal. The device comprises a cooling unit, the cooling unit sequentially comprises a water inlet layer, a backflow layer, an exchange layer and a sealing plate, the water inlet layer comprises a plurality of water inlet pipes arranged in a matrix shape, and the other ends of the water inlet pipes penetrate through the backflow layer and are communicated with the exchange layer; the sealing plate separates the exchange layer from the lath laser amplifier crystal and transfers heat between the exchange layer and the lath laser amplifier crystal; a drainage pipe is arranged on the backflow layer, a one-way flowing piece is arranged on the common wall of the backflow layer and the exchange layer and arranged on one side of the water inlet pipe, and liquid for cooling enters the exchange layer from the water inlet pipe and then enters the backflow layer through the one-way flowing piece till being discharged. By arranging the cooling liquid flowing channel perpendicular to the lath laser amplifier crystal, the contact amount and the contact area between the cooling liquid and the crystal in the initial stage are greatly increased, and the temperature difference caused by the too large cooling liquid passing area is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of lasers, and in particular to a liquid cooling device for a slab laser amplifier crystal. Background Art

[0002] During the operation of the slab laser amplifier crystal, as the pump power increases, a large amount of pump light is injected into it, resulting in the accumulation of harmful heat. If this heat cannot be dissipated in time, it will cause adverse thermo-optical effects, such as thermally induced stress birefringence, thermal depolarization, etc., thereby affecting the performance of the laser. Traditional cooling devices use flowing liquid to flow around the crystal to remove heat, but the liquid will pass through the surface of the crystal in turn, resulting in a temperature gradient in the cooling liquid contacted by different areas, making it difficult to ensure that the overall ambient temperature of the crystal is consistent, thereby maintaining a uniform temperature distribution inside the crystal. Therefore, a liquid cooling device for slab laser amplifier crystals is needed. Summary of the invention

[0003] The object of the present invention is to overcome the above-mentioned shortcomings and provide a liquid cooling device for a slab laser amplifier crystal, which has the advantages of regional cooling, small temperature gradient and more compact structure.

[0004] To achieve the above object, the technical solution of the present invention is: a liquid cooling device for a slab laser amplifier crystal, which includes two cooling units, and the two cooling units are symmetrically arranged on both sides of the slab laser amplifier crystal to achieve cooling. The cooling unit comprises a water inlet layer, a reflux layer, an exchange layer and a sealing plate in sequence. The water inlet layer comprises a plurality of water inlet pipes and a plurality of main pipes arranged in a matrix shape. The main pipe is connected with one end of the water inlet pipe, and the other end of the water inlet pipe passes through the reflux layer and is connected with the exchange layer. The sealing plate separates the exchange layer and the slab laser amplifier crystal and transfers heat between the two. A drainage pipe is arranged on the reflux layer, and a one-way flow part is arranged on the common wall of the reflux layer and the exchange layer. The one-way flow part is arranged on one side of the water inlet pipe. The cooling liquid enters the exchange layer from the water inlet pipe, and then enters the reflux layer through the one-way flow part until it is discharged. The water inlet pipe is coaxially provided with a buffer disk at one end close to the exchange layer. The buffer disk comprises a frame and a reversing plate. Both sides of the frame are rotatably connected with the inner wall of the water inlet pipe. The reversing plate is obliquely arranged in the frame, and at least two reversing plates are symmetrically arranged along the connection between the frame and the water inlet pipe.

[0005] Furthermore, a grid plate is provided in the exchange layer, and each cell in the grid plate corresponds to a water inlet pipe and at least one one-way flow member. In this case, the grid plate divides the exchange layer into several exchange chambers that can independently enter and exit the cooling liquid.

[0006] Furthermore, the other end of the water inlet pipe is closer to the sealing plate than the one-way flow member, and a guide protrusion is provided between the water inlet pipe and the one-way flow member. The guide protrusion surrounds the other end of the water inlet pipe so that the cooling liquid flows in an L shape in the exchange layer.

[0007] Furthermore, the exchange layer also includes a buffer net, which is located between the sealing plate and the other end of the water inlet pipe and connected to the side wall of the grid plate. The buffer net is provided with an intercepting cloth at a position corresponding to the water outlet of the water inlet pipe.

[0008] Furthermore, the unidirectional flow component includes a fixed shell and at least one flow unit, the fixed shell is used for the installation of the unidirectional flow component, and the flow unit is arranged in the fixed shell; the flow unit includes a first channel, a second channel, a return cover and a moving bead, the first channel is arranged on the side close to the exchange layer, the second channel is connected to the first channel and forms a liquid flow channel connecting the exchange layer and the reflux layer in the flow unit, the diameter of the second channel is larger than the first channel, the return cover is arranged in the second channel and a gap is left between the second channel for cooling liquid to flow out, the moving bead is arranged in the return cover, and when there is no external force, the moving bead blocks the first channel on one side under the action of the return cover.

[0009] Furthermore, the inner ring of the return cover is provided with a plurality of arc-shaped elastic plates, and the moving bead is placed in a cavity formed by the arc-shaped elastic plates.

[0010] Furthermore, a plurality of reinforcement holes are arranged around the side wall of the return cover.

[0011] Furthermore, a heat-insulating liquid pipe is provided on the reflux layer, and the heat-insulating liquid pipe injects a heat-insulating liquid having a temperature lower than that of the cooling liquid into the reflux layer.

[0012] Furthermore, a limiting ring is provided at the rotation connection between the buffer tray and the water inlet pipe, and the limiting ring limits the rotation angle of the buffer tray to 5°-25°.

[0013] By adopting the above technical solution, the beneficial effects of the present invention are: 1. The present invention greatly increases the initial contact amount and contact area between the cooling liquid and the crystal by setting a cooling liquid flow channel perpendicular to the slab laser amplifier crystal, thereby preventing the temperature difference caused by the cooling liquid passing through too large an area; a cooling liquid reflux outlet is set on one side of the water inlet pipe, and a reflux layer is set between the water inlet layer and the exchange layer to collect and discharge the refluxed cooling liquid, so that the space planning is more reasonable, the structure is more compact, and the occupied space is saved; a buffer plate is set at the water outlet of the water inlet pipe, and the water flow impacts the buffer plate to make it swing left and right to realize the diversion of the cooling liquid while reducing the vibration caused by the direct impact of the cooling liquid on the sealing plate.

[0014] 2. By setting the grid plate, the space in the exchange layer can be further divided to achieve zoned cooling. The water flow rate can be changed according to the temperature prediction of different positions of the crystal to achieve precise cooling in different areas. By setting the guide bumps, the thickness of the cooling liquid on the sealing plate is compressed, thereby increasing the contact area with the sealing plate, greatly improving the heat exchange efficiency. By setting the buffer net, the cooling liquid on the water inlet pipe is secondary blocked, further compressing the thickness of the cooling liquid on the sealing plate while preventing the vertical water flow from impacting the sealing plate and causing crystal vibration. By setting the one-way flow parts, the one-way flow control between the exchange layer and the return layer is realized, and the function of the moving beads and the return cover is used to prevent the liquid in the return layer from backflowing in the horizontal state. Reinforcement holes are set around the return cover to increase the force of the moving beads on the first channel when not working. By setting the insulation liquid pipe on the return layer, two sets of cooling reflux are formed in the whole cooling unit, which reduces the ambient temperature and greatly improves the cooling effect.

[0015] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.

[0016] Undoubtedly, these and other objects of the present invention will become more apparent after the following detailed description of the preferred embodiment described with reference to various figures and drawings.

[0017] In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, one or several preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation of the present invention.

[0019] In the drawings, the same reference numerals are used for the same components and the drawings are schematic and not necessarily drawn to scale.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only one or several embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on such drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of a liquid cooling device for a slab laser amplifier crystal of the present invention; Figure 2 is a cross-sectional view of a cooling unit; Figure 3 This is the expansion diagram of the cooling unit structure; Figure 4 It is a partial structural diagram of the cooling unit; Figure 5 It is a schematic diagram of the water inlet pipe structure divided according to the cell size on the grid plate; Figure 6 is a schematic diagram of the grid plate structure; Figure 7 It is the structural diagram of the one-way flow part; Figure 8 It is a cross-sectional view of the internal structure of the one-way flow component.

[0022] Description of main reference numerals: 10-cooling unit; 20-slab laser amplifier crystal; 1-water inlet layer; 11-water inlet pipe; 12-main pipe; 13-buffer plate; 131-frame; 132-reversing plate; 2- reflux layer; 21-drain pipe; 22-insulation liquid pipe; 3-Exchange layer; 31-grid plate; 32-guide protrusion; 33-buffer net; 34-interception cloth; 4-Seal the board; 5-One-way flow parts; 51 - fixed shell; 52 - flow unit; 521 - first channel; 522 - second channel; 523 - return cover; 5231 - arc elastic plate; 5232 - reinforcement hole; 524 - moving bead. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but are not used to limit the present invention.

[0024] Reference Figure 1-8 The present invention provides a technical solution: a liquid cooling device for a slab laser amplifier crystal 20, which includes two cooling units 10, and the two cooling units 10 are symmetrically arranged on both sides of the slab laser amplifier crystal 20 to achieve cooling.

[0025] The cooling unit 10 comprises a water inlet layer 1, a return layer 2, an exchange layer 3 and a sealing plate 4 in sequence, wherein adjacent layers share a side wall.

[0026] The water inlet layer 1 includes a plurality of water inlet pipes 11 arranged in a matrix and a plurality of main pipes 12. The main pipes 12 are connected to one end of the water inlet pipes 11, and the main pipes 12 are connected to an external water inlet pipe. To ensure the water pressure in the water inlet pipes 11, the main pipes 12 can be individually connected to a single water inlet pipe 11, or can be connected to more than two water inlet pipes 11 at the same time instead of completing the water inlet紧靠一根主流管12完成进水。The other end of the water inlet pipe 11 passes through the return layer 2 and is connected to the exchange layer 3. The sealing plate 4 separates the exchange layer 3 and the strip laser amplifier crystal 20 and transfers the heat between the two. The sealing plate 4 is preferably made of a material with a certain hardness and good heat exchange effect, such as metal. The return layer 2 is provided with a drain pipe 21. The return layer 2 is used to collect the cooling liquid that has passed through the exchange layer 3. When necessary, the return layer 2 is also connected to a heat preservation liquid pipe 22. The heat preservation liquid pipe 22 injects heat preservation liquid with a temperature lower than that of the cooling liquid into the return layer 2, so as to keep the water inlet pipe 11 warm and reduce the temperature of the crystal use environment at the same time.

[0027] A one-way flow member 5 is provided on the common wall of the return layer 2 and the exchange layer 3. The one-way flow member 5 is arranged on one side of the water inlet pipe 11. The cooling liquid enters the exchange layer 3 from the water inlet pipe 11, and then passes through the one-way flow member 5 and enters the return layer 2 until it is discharged.

[0028] To further refine the flow space of the cooling liquid in the exchange layer 3, a grid plate 31 is provided in the exchange layer 3. Each cell in the grid plate 31 corresponds to a water inlet pipe 11 and at least one one-way flow member 5. At this time, the grid plate 31 divides the exchange layer 3 into several exchange cavities that can individually admit and discharge the cooling liquid.

[0029] To reduce the thickness of the cooling liquid on the surface of the sealing plate 4, the other end of the water inlet pipe 11 is closer to the sealing plate 4 than the one-way flow member 5. Then, a guiding convex block 32 is further provided between the water inlet pipe 11 and the one-way flow member 5. The guiding convex block 32 surrounds the other end of the water inlet pipe 11 so that the cooling liquid flows in an L shape in the exchange layer 3. When there are two one-way flow members 5, the cooling liquid flows in a "凵" shape.

[0030] In order to reduce the impact of water inflow from the water inlet pipe 11 on the sealing plate 4, a buffer plate 13 is coaxially arranged at one end of the water inlet pipe 11 near the exchange layer 3. The buffer plate 13 includes a frame 131 and a reversing plate 132. Both sides of the frame 131 are rotatably connected to the inner wall of the water inlet pipe 11. The reversing plate 132 is obliquely arranged in the frame 131, and at least two reversing plates 132 are symmetrically arranged along the connection between the frame 131 and the water inlet pipe 11; and a limit ring is provided at the rotation connection between the buffer plate 13 and the water inlet pipe 11, and the limit ring limits the rotation angle of the buffer plate 13 to 5°-25°. In order to further reduce the impact, the exchange layer 3 also includes a buffer net 33, which is located between the sealing plate 4 and the other end of the water inlet pipe 11 and connected to the side wall of the grid plate 31. The buffer net 33 is provided with an intercepting cloth 34 at the corresponding position of the water outlet of the water inlet pipe 11.

[0031] The one-way flow member 5 restricts the cooling liquid from entering the return layer 2 only from the water inlet layer 1, and includes a fixed shell 51 and at least one flow unit 52. The fixed shell 51 is used for the installation of the one-way flow member 5, and the flow unit 52 is arranged in the fixed shell 51. The flow unit 52 includes a first channel 521, a second channel 522, a return cover 523 and a moving bead 524. The first channel 521 is arranged on the side close to the exchange layer 3, the second channel 522 connects with the first channel 521 and forms a liquid flow channel connecting the exchange layer 3 and the return layer 2 in the flow unit 52. The diameter of the second channel 522 is larger than that of the first channel 521. The return cover 523 is arranged in the second channel 522 and a gap is left between the second channel 522 for the cooling liquid to flow out. The moving bead 524 is arranged in the return cover 523. The inner ring of the return cover 523 is provided with a plurality of arc-shaped elastic plates 5231, and the moving bead 524 is placed in the cavity formed by the arc-shaped elastic plates 5231. When there is no external force, the moving ball 524 blocks the first channel 521 on one side supported by the arc-shaped elastic plate 5231 in the return cover 523. In order to increase its blocking force, a plurality of reinforcement holes 5232 are arranged on the side wall of the return cover 523. When the work stops, the liquid in the reflux layer 2 will apply pressure to the moving ball 524 through the reinforcement holes 5232.

[0032] Working principle: by injecting water into the water inlet layer 1, the cooling liquid enters the exchange layer 3 from the water inlet pipe 11, and forms a cooling liquid layer on the sealing plate 4, taking away the heat of the crystal transferred from the sealing plate 4. Under the action of water pressure, the cooling liquid that takes away the heat prompts the moving beads 524 in the one-way flow part 5 to squeeze the arc elastic plate 5231, and enters the reflux layer 2 until it is discharged. When the temperature difference between the crystal and the environment is too large, a lower temperature insulation liquid is injected into the reflux layer 2.

[0033] It should be understood that the embodiments disclosed in the present invention are not limited to the specific processing steps or materials disclosed herein, but should be extended to equivalent substitutions of such features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0034] The "embodiment" mentioned in the specification means that the specific features or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. Therefore, the phrases or "embodiment" appearing in various places throughout the specification do not necessarily refer to the same embodiment.

[0035] In addition, the described features or characteristics may be combined in one or more embodiments in any other suitable manner. In the above description, some specific details, such as thickness, quantity, etc., are provided to provide a comprehensive understanding of the embodiments of the present invention. However, those skilled in the relevant art will understand that the present invention can be implemented without one or more of the above specific details or can also be implemented using other methods, components, materials, etc.

Claims

1. A liquid cooling device for a slab laser amplifier crystal, comprising two cooling units, the two cooling units being symmetrically arranged on both sides of the slab laser amplifier crystal to achieve cooling, characterized in that: The cooling unit comprises a water inlet layer, a reflux layer, an exchange layer and a sealing plate in sequence. The water inlet layer comprises a plurality of water inlet pipes and a plurality of main pipes arranged in a matrix shape. The main pipe is connected with one end of the water inlet pipe, and the other end of the water inlet pipe passes through the reflux layer and is connected with the exchange layer. The sealing plate separates the exchange layer and the slab laser amplifier crystal and transfers heat between the two. A drainage pipe is arranged on the reflux layer, and a one-way flow part is arranged on the common wall of the reflux layer and the exchange layer. The one-way flow part is arranged on one side of the water inlet pipe. The cooling liquid enters the exchange layer from the water inlet pipe, and then enters the reflux layer through the one-way flow part until it is discharged. The water inlet pipe is coaxially provided with a buffer disk at one end close to the exchange layer. The buffer disk comprises a frame and a reversing plate. Both sides of the frame are rotatably connected with the inner wall of the water inlet pipe. The reversing plate is obliquely arranged in the frame, and at least two reversing plates are symmetrically arranged along the connection between the frame and the water inlet pipe.

2. The liquid cooling device for a slab laser amplifier crystal according to claim 1, characterized in that: A grid plate is provided in the exchange layer, and each cell in the grid plate corresponds to a water inlet pipe and at least one one-way flow member. At this time, the grid plate divides the exchange layer into several exchange chambers that can independently enter and exit the cooling liquid.

3. The liquid cooling device for a slab laser amplifier crystal according to claim 2, characterized in that: The other end of the water inlet pipe is closer to the sealing plate than the one-way flow member. A guide protrusion is provided between the water inlet pipe and the one-way flow member. The guide protrusion surrounds the other end of the water inlet pipe so that the cooling liquid flows in an L shape in the exchange layer.

4. The liquid cooling device for a slab laser amplifier crystal according to claim 2, characterized in that: The exchange layer also includes a buffer net, which is located between the sealing plate and the other end of the water inlet pipe and connected to the side wall of the grid plate. The buffer net is provided with an interception cloth at a position corresponding to the water outlet of the water inlet pipe.

5. The liquid cooling device for a slab laser amplifier crystal according to claim 2, characterized in that: The one-way flow component includes a fixed shell and at least one flow unit. The fixed shell is used for installing the one-way flow component, and the flow unit is arranged in the fixed shell; the flow unit includes a first channel, a second channel, a return cover and a moving bead. The first channel is arranged on a side close to the exchange layer, the second channel is connected to the first channel and forms a liquid flow channel connecting the exchange layer and the reflux layer in the flow unit, the diameter of the second channel is larger than the first channel, the return cover is arranged in the second channel and a gap is left between the second channel for cooling liquid to flow out, the moving bead is arranged in the return cover, and when there is no external force, the moving bead blocks the first channel on one side under the action of the return cover.

6. The liquid cooling device for a slab laser amplifier crystal according to claim 5, characterized in that The inner ring of the return cover is provided with a plurality of arc-shaped elastic plates, and the moving bead is placed in a cavity formed by the arc-shaped elastic plates.

7. The liquid cooling device for a slab laser amplifier crystal according to claim 6, characterized in that The side wall of the return cover is provided with a plurality of reinforcement holes.

8. The liquid cooling device for a slab laser amplifier crystal according to claim 1, characterized in that: The reflux layer is also provided with a heat-insulating liquid pipe, which injects a heat-insulating liquid having a temperature lower than that of the cooling liquid into the reflux layer.

9. The liquid cooling device for a slab laser amplifier crystal according to claim 1, characterized in that: A limiting ring is provided at the rotation connection between the buffer tray and the water inlet pipe, and the limiting ring limits the rotation angle of the buffer tray to 5°-25°.

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