CN212626506U - Two-phase immersed heat dissipation device of optical fiber laser - Google Patents

Abstract

The embodiment of the utility model provides a double-phase submergence formula heat abstractor of fiber laser, include: the sealing box is provided with a cavity for accommodating a phase change working medium and the optical fiber laser, the phase change working medium is an insulating working medium with gas-liquid two-phase change characteristics, and the optical fiber laser is immersed in the liquid phase change working medium in the sealing box; the cooling mechanism is arranged in the sealing box and is used for being arranged on the upper side of the liquid phase change working medium in the sealing box; the utility model discloses can realize the high-efficient heat dissipation to fiber laser, when guaranteeing each regional heat dissipation homogeneity on fiber laser surface, the surface temperature of steerable fiber laser maintains in predetermineeing the within range to gain better radiating effect.

Description

Two-phase immersed heat dissipation device of optical fiber laser

Technical Field

The utility model relates to a fiber laser technical field especially relates to a double-phase submergence formula heat abstractor of fiber laser.

Background

The optical fiber laser is a laser using rare earth element doped glass optical fiber as a gain medium, the optical fiber laser can be developed on the basis of an optical fiber amplifier, under the action of pump light, high power density is easily formed in the optical fiber, the particle number inversion of the laser energy level of a laser working substance is caused, and laser oscillation output can be formed by properly adding a positive feedback loop. The application range of the fiber laser is very wide, and comprises: laser fiber communication, laser space telecommunication, industrial shipbuilding, automobile manufacturing, laser engraving, laser marking, laser cutting, printing and roll making, drilling/cutting/welding for metals or non-metals, military national defense safety, medical apparatus and instruments, large-scale infrastructure, and the like.

In the use process of the fiber laser, the temperature control is needed, which has important significance for ensuring the high power, high reliability, high electro-optic conversion efficiency, high beam quality and good spectral characteristics of the fiber laser. However, in recent years, with the increasing output power of fiber lasers, the amounts of heat generated by the pump source, the optical device, and the optical fiber of the fiber laser have increased, and the difficulty in heat dissipation has increased. The electric-optical conversion efficiency of the optical fiber laser is 30% -40%, for the optical fiber laser with the output power of 3kW, the heat productivity of the whole optical fiber laser is 4.5kW-7kW, wherein the length of the matched optical fiber can reach more than 40m, and the heat productivity of the optical fiber is 1kW-1.2 kW. Therefore, how to efficiently dissipate heat generated on the fiber laser and control the temperature of each device in the fiber laser to be maintained in a reasonable range becomes a technical problem to be solved urgently at present.

The traditional heat dissipation modes of the optical fiber laser include air-cooled heat dissipation and indirect water-cooled heat dissipation. The air-cooled heat dissipation is a technology that a heating device is fixed on a fin radiator, and air is driven by a fan to flow through fins of the radiator to take away heat. The indirect water-cooling heat dissipation is to fix the heating device on the water-cooling plate, and the water pump drives the cooling water to flow through the water-cooling plate to take away the heat, however, the indirect water-cooling heat dissipation has the problems of complex structure and high cost of the heat dissipation system, and many pipeline interfaces of the water-cooling heat dissipation system also have the problem of leakage, thereby seriously affecting the long-term reliable operation of the water-cooling heat dissipation system. However, the existing air-cooled heat dissipation and indirect water-cooled heat dissipation are difficult to meet the requirement of high-efficiency heat dissipation of a high-power fiber laser, and have the problems of noise, pipeline leakage and the like during heat dissipation.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a double-phase submergence formula heat abstractor of fiber laser for solve current forced air cooling heat dissipation and indirect water-cooling heat dissipation and be difficult to satisfy the problem that carries out high-efficient heat dissipation demand to powerful fiber laser.

The embodiment of the utility model provides a double-phase submergence formula heat abstractor of fiber laser, include: the sealing box is provided with a cavity for accommodating a phase change working medium and the optical fiber laser, the phase change working medium is an insulating working medium with gas-liquid two-phase change characteristics, and the optical fiber laser is immersed in the liquid phase change working medium in the sealing box; and the cooling mechanism is arranged in the sealing box and is used for being arranged on the upper side of the liquid phase change working medium in the sealing box.

According to the utility model discloses a double-phase submergence formula heat abstractor of fiber laser still includes: and the vacuumizing device is communicated with the sealing box.

According to the two-phase immersed heat dissipation device of the optical fiber laser, the cooling mechanism is a heat pipe, one end of the heat pipe extends into the sealing box, and the other end of the heat pipe extends out of the sealing box and is used for connecting a cold source; or the cooling mechanism is a condenser adopting a liquid cooling or air cooling structure.

According to the utility model discloses a double-phase submergence formula heat abstractor of fiber laser still includes: the first support is used for fixing the optical fiber of the optical fiber laser, and the first support is disc-shaped or columnar.

According to the utility model discloses a double-phase submergence formula heat abstractor of fiber laser still includes: and the second bracket comprises a plurality of electrical devices, pumping sources and optical devices which are used for fixing the optical fiber laser respectively.

According to the utility model discloses a double-phase submergence formula heat abstractor of fiber laser still includes: the sealing assembly is mounted on the side wall of the sealing box and used for forming sealing between the optical fiber and the sealing box when one end of the optical fiber laser extends out of the sealing box.

According to the utility model discloses a double-phase submergence formula heat abstractor of fiber laser, seal assembly includes: a Glan head and an optical fiber protective sleeve; the Glan head is fixed on the side wall of the sealing box and sleeved on the outer side wall of the optical fiber protective sleeve; the optical fiber protective sleeve is used for inserting the optical fiber and is connected with the optical fiber in a sealing mode through a sealing glue.

According to the utility model discloses a double-phase submergence formula heat abstractor of fiber laser, optic fibre protective sheath formula pipe box as an organic whole, perhaps, the optic fibre protective sheath is a plurality of built-up components and assembles the sub-assembly that forms along circumference, be formed with in the sub-assembly be used for with the perforation of optic fibre looks adaptation.

The embodiment of the utility model provides a pair of double-phase submergence formula heat abstractor of fiber laser, through splendid attire phase transition working medium in sealed box, submerge fiber laser in the liquid phase transition working medium in sealed box, and the upside of the liquid phase transition working medium in sealed box sets up cooling body, then when using fiber laser, the heat that produces on the liquid phase transition working medium can the fiber laser, and change mutually, become the gaseous state by the liquid state, under the effect of density difference and gravity, the phase transition working medium of gaseous state can rise, and carry out the heat exchange with cooling body, thereby lead to the condensation of the phase transition working medium of gaseous state to be liquid, the condensation can drip to the bottom of sealed box under the effect of gravity for liquid phase transition working medium, and dispel the heat to fiber laser through the phase transition process once more.

Therefore, the utility model discloses can realize the high-efficient heat dissipation to fiber laser because fiber laser submergence in the liquid phase transition working medium in the seal box, and the phase transition working medium keeps invariable at phase transition in-process temperature to when guaranteeing each regional heat dissipation homogeneity on fiber laser surface, the surface temperature of steerable fiber laser maintains in predetermineeing the within range, and then gains better radiating effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a two-phase immersion type heat dissipation device of an optical fiber laser according to an embodiment of the present invention;

fig. 2 is a schematic view of the optical fiber mounted on the first bracket according to the embodiment of the present invention;

fig. 3 is a schematic diagram of a partially enlarged structure at K in fig. 1 according to an embodiment of the present invention;

fig. 4 is a schematic view of an assembly structure of the optical fiber protective sheath according to the embodiment of the present invention.

In the figure, 1, sealing the box; 2. a fiber laser; 21. an electrical device; 22. a pump source; 23. an optical device; 24. an optical fiber; 3. a cooling mechanism; 4. a first bracket; 41. a first connecting column; 42. a support disc; 5. a second bracket; 51. a second connecting column; 52. a metal fixing plate; 6. a seal assembly; 61. a glan head; 62. an optical fiber protective sheath; 621. assembling parts; 622. perforating; 63. and (7) sealing the glue.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1, the present embodiment provides a two-phase immersion type heat dissipation device for a fiber laser, including: the sealing box 1 is provided with a cavity for containing a phase change working medium and the optical fiber laser 2, the phase change working medium is an insulating working medium with gas-liquid two-phase change characteristics, and the optical fiber laser 2 is immersed in the liquid phase change working medium in the sealing box 1; and the cooling mechanism 3 is arranged in the sealing box 1 and is used for being arranged on the upper side of the liquid phase change working medium in the sealing box 1.

Concretely, the heat abstractor that this embodiment is shown is through splendid attire phase transition working medium in seal box 1, with fiber laser 2 submergence in seal box 1 in liquid phase transition working medium, and the upside of liquid phase transition working medium sets up cooling body 3 in seal box 1, then when fiber laser 2 uses, the heat that produces on liquid phase transition working medium can the fiber laser 2, and change of phase takes place, become the gaseous state by the liquid state, under the effect of density difference and gravity, gaseous phase transition working medium can rise, and carry out the heat exchange with cooling body 3, lead to gaseous phase transition working medium condensation to be liquid, the condensation is liquid phase transition working medium can drip to seal box 1's bottom under the effect of gravity, dispel the heat to fiber laser 2 through the phase transition process once more, and circulate with this.

Therefore, the heat dissipation device shown in the embodiment can realize efficient heat dissipation of the fiber laser 2, and the fiber laser 2 is immersed in the liquid phase change working medium in the sealing box 1, and the temperature of the phase change working medium is kept constant in the phase change process, so that the surface temperature of the fiber laser 2 can be controlled to be maintained within a preset range while the heat dissipation uniformity of each region on the surface of the fiber laser 2 is ensured, and a better heat dissipation effect is achieved.

It should be noted that the fiber laser 2 shown in the present embodiment includes an electrical device 21, a pump source 22, an optical device 23, and an optical fiber 24, where the electrical device 21 may be a switching power supply known in the art, the optical device 23 includes a coupler, a grating, a mode stripper, etc., the electrical device 21 is electrically connected to the pump source 22, the pump source 22 delivers laser to the coupler, the coupler is connected to one end of the optical fiber 24 through one grating, and the other end of the optical fiber 24 is connected to the mode stripper through another grating. The shape of the capsule 1 shown in the present embodiment may be a rectangular parallelepiped, a cylinder, or the like, and is not particularly limited as long as it is dimensionally compatible with the fiber laser 2.

Meanwhile, the phase-change working medium shown in this embodiment may be an insulating working medium having a gas-liquid two-phase-change characteristic, such as a fluorocarbon or a hydrofluoride, which is known in the art, and the boiling point of the phase-change working medium may be 20 ℃ to 100 ℃. Because the direct emergence of the phase transition heat absorption process of fiber laser 2 between fiber laser 2 and the phase transition working medium, compare in traditional air-cooled and indirect water-cooling, the heat transfer order of indirect water-cooling is from generating heat the device in proper order, heat-conducting glue, water-cooling board to cooling water, the heat transfer order of air-cooled is from generating heat the device in proper order, heat-conducting glue, radiator to the air, thereby this embodiment is shorter to fiber laser 2's phase transition heat absorption route, and the radiating process is more direct, thereby has higher radiating efficiency.

In addition, the fiber laser 2 is used to be immersed in the liquid phase change working medium in the sealed box 1, which can be understood that the fiber laser 2 is used to be partially or completely immersed in the liquid phase change working medium in the sealed box 1, and in order to ensure the uniformity of heat dissipation of each region on the surface of the fiber laser 2, in this embodiment, the fiber laser 2 is preferably completely immersed in the liquid phase change working medium in the sealed box 1.

Preferably, this embodiment further includes: and the vacuumizing device is communicated with the sealing box 1, wherein the vacuumizing device is not specifically shown in the figure 1.

Specifically, evacuating device includes vacuum pump and evacuation pipeline, can set up the control valve on the evacuation pipeline, and the end of breathing in of vacuum pump communicates the one end of evacuation pipeline, and the other end of evacuation pipeline communicates seal box 1. On one hand, the vacuumizing device can change the boiling point of the phase change working medium by adjusting the vacuum degree in the sealing box 1, so that the surface temperature of the optical fiber laser is controlled to be kept at a set value; on the other hand, when the air pressure in the sealing box 1 is too high due to the phase change process of the phase change working medium, the air pressure in the sealing box 1 can be reduced by starting the vacuumizing function of the vacuumizing device, and a certain safety protection effect is achieved on the sealing box 1.

Based on the improvement of the above embodiment, in one preferred embodiment, the cooling mechanism 3 is preferably a heat pipe, a plurality of heat pipes can be arranged, one end of each heat pipe extends into the sealing box 1, so that when the phase-change working medium is vaporized and rises to the top of the sealing box 1, the heat pipe exchanges heat with the gaseous phase-change working medium, and the gaseous phase-change working medium is condensed into a liquid state; because the other end of the heat pipe stretches out of the sealing box 1 and is connected with the cold source, the constant temperature of the heat pipe can be ensured based on the cold energy provided by the cold source, and therefore one end of the heat pipe can continuously perform heat exchange action with the gaseous phase-change working medium.

As shown in fig. 1, based on the modification of the above embodiment, in another preferred embodiment, the cooling mechanism 3 may preferably be a condenser using a liquid cooling or air cooling structure. Wherein, when cooling body 3 is for adopting the condenser of liquid cooling, the condenser can adopt copper pipe or aluminum pipe to the equipment is snakelike coil structure of arranging, can let in the cooling water in the condenser, in order to reach the cooling effect to gaseous phase transition working medium.

Preferably, as shown in fig. 1, the present embodiment further includes: and a first holder 4, on which the optical fiber 24 of the fiber laser 2 is fixed, the first holder 4 having a disk-like or columnar shape.

Specifically, when the shape of the first bracket 4 is designed to be a disc shape, the first bracket 4 may be composed of a plurality of first connection pillars 41 and a support plate 42, the lower end of the first connection pillar 41 is connected to the bottom end of the sealing box 1, and the upper end of the first connection pillar 41 is connected to the lower end face of the support plate 42, wherein the support plate 42 may be formed by punching a metal sheet, and a plurality of hollow holes are punched on the support plate 42, so that when the optical fiber 24 is fixed on the support plate 42, the supply of the liquid phase change working medium near the optical fiber 24 is facilitated, and the corresponding structural strength of the fixed optical fiber 24 is not affected.

As shown in fig. 2, the support disk 42 may also be a radial metal bracket, and accordingly, each radial end of the metal bracket is connected to the upper end of the first connecting post 41.

Since the optical fiber 24 of the fiber laser 2 has a relatively large length, the optical fiber 24 is usually wound into a fiber reel in order to reduce the storage space and to provide a reliable protection for the optical fiber 24. Based on the disc-shaped design structure of the first bracket 4, the optical fibers 24 can be orderly wound on the supporting disc 42 into a planar annular optical fiber disc, the gap between adjacent optical fibers on the optical fiber disc can be set to be 0-5mm, and the optical fiber disc is adhered to the supporting disc 42 by using tin foil paper, or is fixed on the supporting disc 42 by using other structural members.

Meanwhile, when the shape of the first holder 4 is designed to be a column shape, the optical fiber 24 may be spirally wound on the first holder 4 in the circumferential direction, accordingly.

Preferably, this embodiment further includes: and a second holder 5, wherein the second holder 5 comprises a plurality of electrical devices 21, pump sources 22 and optical devices 23 for respectively fixing the optical fiber laser 2.

As shown in fig. 1, the second brackets 5 may be specifically provided in three, and arranged side by side. Each second bracket 5 can be composed of a second connecting column 51 and a metal fixing plate 52, the lower end of the second connecting column 51 is connected with the bottom end of the sealing box 1, and the upper end of the second connecting column 51 is connected with the lower edge of the metal fixing plate 52. Wherein, an electric device 21 is arranged on the first second bracket 5, a pumping source 22 is arranged on the second bracket 5, and an optical device 23 is arranged on the third second bracket 5, wherein the optical device 23 comprises a coupler, a grating, a stripper and the like.

Preferably, as shown in fig. 1, the present embodiment further includes: and the sealing assembly 6 is arranged on the side wall of the sealing box 1, and is used for forming sealing between the optical fiber 24 and the sealing box 1 when one end of the optical fiber 24 of the optical fiber laser 2 extends out of the sealing box 1.

Specifically, as shown in fig. 3, the seal assembly 6 shown in the present embodiment includes: a glan head 61 and a fiber protective sleeve 62; the glan head 61 is fixed on the side wall of the sealing box 1 and sleeved on the outer side wall of the optical fiber protective sleeve 62; the optical fiber protective sleeve 62 is used for inserting the optical fiber 24 therein and for sealing connection with the optical fiber 24 by a sealant 63. In this way, by providing the sealing member 6, when one end of the optical fiber 24 extends out of the sealing box 1, not only a reliable seal can be formed between the optical fiber 24 and the side wall of the sealing box 1, but also the optical fiber 24 can be effectively protected.

Because the flange head 61 and the outer side wall of the optical fiber protective sleeve 62 can realize better sealing connection, only the sealing performance between the optical fiber 24 and the optical fiber protective sleeve 62 needs to be ensured during actual installation. In one embodiment, as shown in FIG. 3, the fiber optic protective casing 62 may be provided as a one-piece ferrule such that the sealant 63 may be directly filled at both ends of the fiber optic protective casing 62 to achieve a sealed connection between the optical fiber 24 and the fiber optic protective casing 62 as the optical fiber 24 passes through the fiber optic protective casing 62.

In another preferred embodiment, as shown in FIG. 4, the fiber protective sleeve 62 can be an assembly of a plurality of segments 621 assembled in a circumferential direction, and perforations 622 are formed in the assembly for accommodating the optical fibers 24. Wherein, the piece 621 can specifically set up two, and every piece 621's cross section all is semicircular, offers the recess that is used for placing optic fibre 24 at the centre of a circle position of piece 621, thereby after imbedding optic fibre 24 into one of them recess, can correspond two semicircular piece 621 and assemble, and optic fibre 24 is in the perforation 622 that forms is assembled to two recesses by the restriction promptly, then, only need through screwed connection or the mode of clamp connection with two piece 621 fastenings as an organic whole can.

Finally, it should be pointed out that, this embodiment still can set up temperature sensor, level sensor and pressure sensor in seal box 1 to the surface temperature of fiber laser is monitored in real time through temperature sensor, through the liquid level of liquid phase transition working medium of level sensor monitoring, ensures that fiber laser submerges in liquid phase transition working medium all the time, still monitors the atmospheric pressure in seal box 1 through pressure sensor simultaneously, on the basis of guaranteeing the heat abstractor operation security and the reliability that this embodiment shows, further ensures the radiating homogeneity of each part heat of fiber laser.

In summary, the two-phase immersion type heat dissipation device of the fiber laser disclosed in the embodiment has the following beneficial effects:

(1) this embodiment is based on two-phase submergence formula heat dissipation scheme, can select for use the volatile phase transition working medium of low boiling point adaptively according to the temperature specification that generates heat of fiber laser, according to the direct surface contact with fiber laser of phase transition working medium to take away the heat on fiber laser surface in a large number through reciprocal phase transition process, not only heat conduction efficiency is high, can realize the high-efficient heat dissipation to fiber laser moreover.

(2) The embodiment can utilize the characteristic that the temperature of the phase change working medium is kept unchanged when the phase change occurs, control the surface temperature of the fiber laser to be maintained in a preset temperature range, and ensure that the temperature on the surface of the fiber laser is not influenced by the environmental temperature and the temperature of cooling water.

(3) The traditional heat dissipation modes of air cooling and indirect water cooling can cause different heat dissipation capacities of optical fibers at different positions due to the limitation of the flow channel layout and the temperature difference between the upstream and downstream of the flow channel, and relatively speaking, the surface heat dissipation capacity of the optical fiber laser immersed in the liquid phase change working medium shown in the embodiment is the same, so that the local temperature of the optical fiber laser can be effectively prevented from being too high, and the surface temperature of the corresponding optical fiber of the optical fiber laser is ensured to be more uniform.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A two-phase immersion heat sink for fiber lasers, comprising:

the sealing box is provided with a cavity for accommodating a phase change working medium and the optical fiber laser, the phase change working medium is an insulating working medium with gas-liquid two-phase change characteristics, and the optical fiber laser is immersed in the liquid phase change working medium in the sealing box;

and the cooling mechanism is arranged in the sealing box and is used for being arranged on the upper side of the liquid phase change working medium in the sealing box.

2. The two-phase immersion heat sink for fiber laser of claim 1, further comprising: and the vacuumizing device is communicated with the sealing box.

3. The two-phase immersed heat dissipation device of the optical fiber laser as claimed in claim 1, wherein the cooling mechanism is a heat pipe, one end of the heat pipe extends into the sealing box, and the other end of the heat pipe extends out of the sealing box and is used for connecting a cold source;

or the cooling mechanism is a condenser adopting a liquid cooling or air cooling structure.

4. The two-phase immersion heat sink for fiber laser according to any of claims 1 to 3, further comprising: the first support is used for fixing the optical fiber of the optical fiber laser, and the first support is disc-shaped or columnar.

5. The two-phase immersion heat sink for fiber laser according to any of claims 1 to 3, further comprising: and the second bracket comprises a plurality of electrical devices, pumping sources and optical devices which are used for fixing the optical fiber laser respectively.

6. The two-phase immersion heat sink for fiber laser according to any of claims 1 to 3, further comprising: the sealing assembly is mounted on the side wall of the sealing box and used for forming sealing between the optical fiber and the sealing box when one end of the optical fiber laser extends out of the sealing box.

7. The two-phase immersion heat sink for fiber lasers of claim 6, wherein the sealing assembly includes: a Glan head and an optical fiber protective sleeve; the Glan head is fixed on the side wall of the sealing box and sleeved on the outer side wall of the optical fiber protective sleeve; the optical fiber protective sleeve is used for inserting the optical fiber and is connected with the optical fiber in a sealing mode through a sealing glue.

8. The two-phase immersed heat dissipation device for the optical fiber laser as claimed in claim 7, wherein the optical fiber protection sleeve is an integral sleeve, or the optical fiber protection sleeve is an assembly formed by assembling a plurality of assembling pieces along a circumferential direction, and a through hole adapted to the optical fiber is formed in the assembly.

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