CN110970788B

CN110970788B - Lens cooling device of optical gate for optical fiber laser

Info

Publication number: CN110970788B
Application number: CN201911010257.4A
Authority: CN
Inventors: 沈华; 邓世炜; 孔庆庆; 李岳峰; 张瑞
Original assignee: Nanjing University of Science and Technology
Current assignee: Nanjing University of Science and Technology
Priority date: 2019-10-23
Filing date: 2019-10-23
Publication date: 2021-02-12
Anticipated expiration: 2039-10-23
Also published as: CN110970788A

Abstract

The invention discloses a lens cooling device of an optical gate for an optical fiber laser, which comprises a cooling shell, a lens fixing and cooling base body, a pressing ring, two sealing rings, two copper rings and N headless screws. The sealing ring is arranged in a sealing groove of the lens fixing cooling base body, the cooling shell is matched with the lens fixing cooling base body, the cooling shell and the lens fixing cooling base body are relatively fixed through N headless screws, the copper ring-lens-copper ring structure is placed in the lens fixing cooling base body, the pressing ring is screwed into the lens fixing cooling base body, and the copper ring-lens-copper ring structure is fixed in the fixing cooling base body. The lens cooling device can stably fix the lens in the lens cooling device, and can cool the lens after water is introduced, so that the lens bears high-power laser, the thermal aberration of the lens caused by temperature rise is reduced, the coupling efficiency of the optical gate is improved, and the safety and the stability of the optical gate are improved.

Description

Lens cooling device of optical gate for optical fiber laser

Technical Field

The invention belongs to the field of fiber lasers, and particularly relates to a lens cooling device of an optical gate for a fiber laser.

Background

Fiber lasers, in which optical shutters are employed so that one laser can perform multiple operations simultaneously, are widely used in cutting, welding, and material processing. The optical path switching is carried out through the optical gate, so that one optical fiber laser can provide a plurality of output ends and is connected to different working units, one optical fiber laser can become a power source of the plurality of working units, and the input cost of a user to equipment is remarkably reduced. When the optical fiber at the output end of the optical gate is damaged or the use requirement is changed, the optical fiber can be replaced at any time, and the simplicity and convenience of operation are improved. With the development and application of fiber lasers in China, the requirement for optical shutters in the market is increased day by day, at present, companies for producing optical shutters for high-power fiber lasers internationally mainly include Optoskand in Sweden and IPG in the United states, no relevant optical shutter product exists in China, and one difficulty lies in lens cooling of the optical shutters.

With the continuous development of fiber lasers, the fiber lasers are used as input sources of optical gates, and the maximum power of the fiber lasers is higher and higher. The optical shutter also needs to have the capability of bearing high power as an intermediate device from the laser input end of the optical fiber to the laser output end. One of the problems of the optical shutter being subjected to high power is that the lens of the optical shutter is cooled, so a mechanical device is required to cool the lens of the optical shutter, so that the lens is subjected to high-power laser, thermal aberration of the lens caused by temperature is reduced, coupling efficiency of the optical shutter is improved, and safety and stability of the optical shutter are improved.

Disclosure of Invention

The invention aims to provide a lens cooling device of an optical gate for an optical fiber laser, which enables a lens in the optical gate to bear high-power laser, reduces thermal aberration caused by temperature of the lens, improves coupling efficiency of the optical gate and improves safety and stability of the optical gate.

The technical solution for realizing the purpose of the invention is as follows: the utility model provides a lens cooling device of optical gate for fiber laser, includes cooling shell, lens fixed cooling base member, clamping ring, two sealing washer, two copper rings and N headless screw, and above-mentioned part makes up into an entirety, as lens cooling device. The sealing ring is arranged in a sealing groove of the lens fixing cooling base body, the cooling shell is matched with the lens fixing cooling base body, the cooling shell and the lens fixing cooling base body are relatively fixed through N headless screws, the copper ring-lens-copper ring structure is placed in the lens fixing cooling base body, the pressing ring is screwed into the lens fixing cooling base body, and the copper ring-lens-copper ring structure is fixed in the fixing cooling base body. The lens cooling device can stably fix the lens in the lens cooling device, and can cool the lens after water is introduced, so that the lens bears high-power laser, the thermal aberration of the lens caused by temperature rise is reduced, the coupling efficiency of the optical gate is improved, and the safety and the stability of the optical gate are improved.

Compared with the prior art, the invention has the remarkable advantages that: (1) the lens cooling device is assembled into a whole through the extrusion action of the sealing ring and the fixing action of the headless screw, and the structure is favorable for assembly and disassembly, is convenient for cleaning the interior of the device and is convenient for replacing the sealing ring; (2) the lens can be fixed at different positions in the lens fixing and cooling matrix by replacing copper ring combinations with different lengths, and the lens fixing and cooling matrix is suitable for cooling lenses with different focal lengths; (3) the pressing ring is utilized to fix the structure of the copper ring, the lens and the copper ring in the lens fixing and cooling matrix, so that the stability of the lens is improved; (4) after constant-temperature water is introduced, the lens cooling device can effectively take away heat on the lens to cool the lens, so that the thermal aberration of the lens is reduced, and the coupling efficiency is improved; (5) the lens is fixed in the middle area of the lens fixing cooling base body with a certain length, so that the damage of a surface film of the lens caused by dust falling on the surface of the lens in light emitting can be effectively avoided; (6) a reasonable lens installation method is provided, so that damage to the lens caused by improper installation can be avoided; (7) a reasonable assembling and disassembling method is provided, so that the abrasion and deformation of the device caused by improper assembling and disassembling can be avoided.

Drawings

Fig. 1 is a schematic view showing a configuration of a lens cooling device of an optical shutter for a fiber laser according to the present invention before assembly.

Fig. 2 is a schematic view showing a configuration of an optical shutter for a fiber laser according to the present invention after assembling a lens cooling device.

Fig. 3 is a schematic structural view of the cooling housing of the present invention.

FIG. 4 is a schematic structural view of a lens-fixing cooling base according to the present invention, wherein FIG. (a) is a first three-dimensional view of the lens-fixing cooling base, FIG. (b) is a second three-dimensional view of the lens-fixing cooling base, FIG. (c) is a front view of FIG. (a), and FIG. (d) is a sectional structural view of FIG. (b).

FIG. 5 is a schematic view of the assembly and disassembly of the components of the lens cooling device of the present invention.

FIG. 6 is a schematic view of the lens mounting of the present invention.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

Referring to fig. 1 to 6, a lens cooling device of an optical shutter for a fiber laser is used for stably fixing a lens 6 to be cooled in the lens cooling device, and cooling the lens 6 to be cooled by supplying water to the lens cooling device, wherein the lens cooling device comprises a cooling housing 1, a lens fixing and cooling base 2, a first sealing ring 3, a second sealing ring 4, a first copper ring 5, a second copper ring 7, a pressing ring 8 and N headless screws 9, wherein N is not less than 3. The first sealing ring 3 and the second sealing ring 4 are respectively arranged in a first sealing groove 205 and a second sealing groove 206 at two ends of the lens fixing and cooling substrate 2; the first copper ring 5, the lens 6 to be cooled, the second copper ring 7 and the pressing ring 8 are sequentially arranged in the lens fixing and cooling matrix 2 through the limit of the pressing ring 8 on the first copper ring 5, the lens 6 to be cooled and the second copper ring 7; the lens fixing and cooling base body 2 is arranged in the cooling shell 1, and the lens fixing and cooling base body 2 is fixedly connected with the cooling shell 1 through N headless screws 9.

Referring to fig. 3, the cooling housing 1 is a thin-walled cylinder, and a circle of slots 101 is formed in an inner wall of one end of the cooling housing, and M headless screw mounting holes 102 are uniformly distributed in an outer wall of the other end of the cooling housing along a circumferential direction, where M = N. The inner force size of the clamping groove 101 is matched with the maximum outer diameter size of the copper ring limiting clamping ring 211. The M headless screw mounting holes 102 match the N headless screw sizes 9. The cooling housing 1 functions to form a water flow chamber with the lens-fixing cooling base 2, seal the circulating water in the lens-fixing cooling base 2, and fix the relative position with the lens-fixing cooling base 2.

Referring to fig. 4, the lens fixing and cooling base 2 includes a base body cylinder 208, a first water baffle 203, a second water baffle 204, a clamping ring fixing annular baffle 209, and a limiting annular baffle 210. Clamping ring fixed ring baffle 209 and spacing ring baffle 210 overlap respectively at base body barrel 208 both ends to link firmly with base body barrel 208, first water baffle 203 length is greater than the length of second water baffle 204, first water baffle 203 and the parallel and symmetry of second water baffle 204 are fixed at base body barrel 208 outer wall, clamping ring fixed ring baffle 209 and spacing ring baffle 210 are connected respectively to first water baffle 203 both ends, second water baffle 204 one end links to each other with spacing ring baffle 210, leave the passageway between the other end and the clamping ring fixed ring baffle 209. The limiting annular baffle 210 is provided with a first water through opening 201 and a second water through opening 202, and the first water through opening 201 and the second water through opening 202 are positioned on two sides of the first water baffle 203; a circle of first sealing grooves 205 are formed in the circumferential outer wall of the limiting annular baffle 210, and the first sealing rings 3 are arranged in the first sealing grooves 205; be equipped with the spacing snap ring 211 of round copper ring on the spacing ring baffle 210 terminal surface, the spacing snap ring 211 external diameter of copper ring is greater than spacing ring baffle 210 terminal surface external diameter, the spacing snap ring 211 internal diameter of copper ring is less than spacing ring baffle 210 terminal surface internal diameter, draw-in groove 101 internal diameter and the spacing snap ring 211 external diameter size phase-match of copper ring in the cooling shell 1, when lens fixed cooling base member 2 assembles in cooling shell 1, the spacing snap ring 211 of copper ring is spacing with draw-in groove 101 cooperation, simultaneously basic body barrel 208, first water baffle 203, second water baffle 204, ring baffle 209 is fixed to the clamping ring, form the rivers chamber between spacing ring baffle 210 and the cooling shell 1, first copper ring 5 and the 7 internal diameter sizes of second copper ring and the spacing snap ring 211 internal diameter size phase-match of copper ring, guarantee that copper ring-lens-copper ring structure can be restricted in copper ring spacing snap ring 211 internal diameter department. A circle of second sealing grooves 206 and a circle of fixing grooves 207 are arranged on the circumferential outer wall of the pressing ring fixing annular baffle plate 209 at intervals, the second sealing grooves 206 are positioned between the fixing grooves 207 and the first sealing grooves 205, and the second sealing rings 4 are arranged in the second sealing grooves 206; the circulating water is effectively sealed in a water flow cavity between the lens fixing cooling base body 2 and the cooling shell 1 through the close contact of the first sealing groove 205, the second sealing groove 206, the first sealing ring 3 and the second sealing ring 4 and the cooling shell 1; a ring of fixing grooves 207 are formed in the pressing ring fixing annular baffle 209, a headless screw 9 is screwed into a headless screw mounting hole 102 and then props against the fixing grooves 207 during assembly, and the difficulty of the assembly direction is simplified due to the design of the fixing grooves 207; the pressing ring 8 is fixedly connected with the inner ring of the pressing ring fixing annular baffle 209 through threads. First copper ring 5, second copper ring 7 and treat the external diameter of cooling lens 6 and base body barrel 208 internal diameter size phase-match, first copper ring 5 and second copper ring 7 are pressed and are being treated cooling lens 6 both ends, first copper ring 5, treat that cooling lens 6 and second copper ring 7 set up in base body barrel 208, and copper ring-lens-copper ring structure one end contacts with the spacing snap ring 211 internal diameter portion of copper ring phase-splitting, the other end stretches out base body barrel 208, compress tightly through clamping ring 8 that sets up in clamping ring fixed ring shape baffle 209 inner circle. The lens fixing and cooling base body 2 is the core of the lens cooling device and plays a role in fixing the lens 6 to be cooled and cooling the lens 6 to be cooled. One of the first water passage port 201 and the second water passage port 202 is a water inlet port, the other is a water outlet port, when water is communicated, water flows in from the water inlet port, flows through a channel between the second water baffle plate 204 and the clamping ring fixing annular baffle plate 209, and then flows out from the water outlet port, so that water circulation is performed, and when the water pressure of the water passage port is high, the water flow cavity between the base body cylinder 208 and the cooling shell 1 can be filled with water to perform water circulation.

First sealing washer 3 and second sealing washer 4 are silica gel O type sealing washer, have elasticity good, sealed effectual advantage.

When the first copper ring 5, the lens 6 to be cooled and the second copper ring 7 are sequentially fixed in the base body cylinder 208, the lengths of the first copper ring 5 and the second copper ring 7 are related to the focal length of the lens, the edge thickness of the lens and the distance from the input end of the optical shutter to the lens cooling device, so that the input end of the optical fiber is right at the focal point of the lens 6 to be cooled after the lens 6 to be cooled is installed.

The assembly and disassembly of the lens cooling device is shown in fig. 5. Need first assembly piece 10 during the equipment, first assembly piece 10 is formed by first cylinder and second cylinder connection, and first cylinder diameter is greater than second cylinder diameter, and second cylinder diameter and the spacing snap ring 211 internal diameter size phase-match of copper ring, and first cylinder diameter is big than the spacing snap ring 211 internal diameter size of copper ring. During assembly, the first sealing ring 3 and the second sealing ring 4 are respectively arranged in a first sealing groove 205 and a second sealing groove 206 in the lens fixing cooling base body 2, the first assembly block 10 is arranged at one side of a copper ring limiting snap ring 211 of the lens fixing cooling base body 2, the cooling shell 1 is arranged on a horizontal plane, the snap groove 101 faces upwards, the lens fixing cooling base body 2 provided with the first assembly block 10 is partially inserted into the cooling shell 1, the first assembly block 10 is extruded downwards, so that the cooling shell 1 and the lens fixing cooling base body 2 are uniformly stressed and assembled together, at the moment, the first sealing ring 3 and the second sealing ring 4 are tightly attached to the inner wall of the cooling shell 1 to play a sealing role, then the first assembly block 10 is taken down, N headless screws 9 penetrate through the headless screw mounting holes 102 and are propped against the fixing groove 207, so that the cooling shell 1 and the lens fixing cooling base body 2 are screwed relatively fixed, at this point the lens cooling device is assembled. The second assembling block 11 is required at the time of disassembly. The second assembly block 11 is formed by connecting a third cylinder and a fourth cylinder, the diameter of the third cylinder is larger than that of the fourth cylinder, the diameter of the fourth cylinder is matched with the inner diameter of the clamping ring fixing annular baffle 209, and the diameter of the third cylinder is larger than that of the clamping ring fixing annular baffle 209. The N headless screws 9 are screwed out of the headless screw mounting holes 102, the fourth cylinder of the second assembly block 11 is arranged in the pressing ring fixing annular baffle 209, the lens cooling device is fixed, the second assembly block 11 is extruded, the cooling shell 1 and the lens fixing cooling base body 2 with the sealing ring can be disassembled evenly in stress, and then the second assembly block 11 is taken down. The first assembling block 10 and the second assembling block 11 are favorable for convenient assembly and disassembly, so that the outer sides of the first sealing ring 3 and the fourth sealing ring 4 are uniformly stressed during assembly and disassembly, the first sealing ring 3 and the fourth sealing ring 4 are prevented from being damaged during assembly due to nonuniform stress, and the water leakage phenomenon due to the damage of the first sealing ring 3 and the fourth sealing ring 4 is prevented.

Lens mounting of the lens cooling device is shown in fig. 6, with the arrow pointing downward, and 12 is an assembled body of the lens cooling device of fig. 4. After the lens cooling device is assembled, the lens may be installed. Put into base body barrel 208 with first copper ring 5 earlier, upwards slide first copper ring 5 to upper surface and clamping ring fixed ring shape baffle 209 department, will wait to cool off lens 6 and put into clamping ring fixed ring shape baffle 209 in, the first copper ring 5 of gliding, it can also follow first copper ring 5 and slowly move down to wait to cool off lens 6, until first copper ring 5 and the contact of the spacing snap ring of copper ring 211 inner diameter portion, slowly slide second copper ring 7 downwards into base body barrel 208, until contacting with lens 6, with 8 screw in clamping ring fixed ring shape baffle 209 of clamping ring, the damage that this kind of installation lens mode can effectively avoid lens installation improper to bring.

Claims

1. A lens cooling device for an optical gate for an optical fiber laser, wherein a lens is stably fixed to the lens cooling device, and the lens is cooled by supplying water to the lens cooling device, characterized in that: comprises that

A lens-holding cooling base (2) for placing a lens (6) to be cooled;

the first sealing ring (3) and the second sealing ring (4) are respectively arranged at two ends of the lens fixing and cooling base body (2) to play a role in sealing;

the first copper ring (5) and the second copper ring (7) are abutted against two ends of the lens (6) to be cooled and arranged in the lens fixing and cooling base body (2) together with the lens (6) to be cooled;

the pressing ring (8) is abutted against the outer side of the second copper ring (7), is positioned in the lens fixing and cooling matrix (2), and limits the first copper ring (5), the lens (6) to be cooled and the second copper ring (7);

the cooling shell (1) is sleeved on the outer side of the lens fixing and cooling matrix (2) and used for sealing circulating water in the lens fixing and cooling matrix (2), and the lens fixing and cooling matrix (2) is fixedly connected with the cooling shell (1) through N headless screws (9);

the cooling shell (1) is a thin-wall cylinder, the inner wall of one end of the cooling shell is provided with a circle of clamping grooves (101), and the clamping grooves (101) are used for limiting the lens fixing cooling matrix (2);

the lens fixing and cooling base body (2) comprises a base body cylinder (208), a first water baffle (203), a second water baffle (204), a pressing ring fixing annular baffle (209) and a limiting annular baffle (210), wherein the pressing ring fixing annular baffle (209) and the limiting annular baffle (210) are respectively sleeved at two ends of the base body cylinder (208) and fixedly connected with the base body cylinder (208), the length of the first water baffle (203) is greater than that of the second water baffle (204), the first water baffle (203) and the second water baffle (204) are parallel and symmetrically fixed on the outer wall of the base body cylinder (208), two ends of the first water baffle (203) are respectively connected with the pressing ring fixing annular baffle (209) and the limiting annular baffle (210), one end of the second water baffle (204) is connected with the limiting annular baffle (210), and a channel is reserved between the other end of the second water baffle and the pressing ring fixing annular baffle (209); a first water through opening (201) and a second water through opening (202) are formed in the limiting annular baffle (210), and the first water through opening (201) and the second water through opening (202) are located on two sides of the first water baffle (203); a circle of copper ring limiting snap ring (211) is arranged on the end face of the limiting annular baffle (210), the inner diameter of a snap groove (101) in the cooling shell (1) is matched with the outer diameter of the copper ring limiting snap ring (211), when the lens fixing cooling base body (2) is assembled in the cooling shell (1), the copper ring limiting snap ring (211) is matched with the snap groove (101) for limiting, and meanwhile, a water flow cavity is formed among the base body cylinder (208), the first water baffle (203), the second water baffle (204), the pressing ring fixing annular baffle (209), the limiting annular baffle (210) and the cooling shell (1); a circle of first sealing groove (205) is formed in the circumferential outer wall of the limiting annular baffle (210), and the first sealing ring (3) is arranged in the first sealing groove (205); a circle of second sealing grooves (206) and a circle of fixing grooves (207) are formed in the circumferential outer wall of the pressing ring fixing annular baffle (209) at intervals, the second sealing grooves (206) are located between the fixing grooves (207) and the first sealing grooves (205), and second sealing rings (4) are arranged in the second sealing grooves (206); water is effectively sealed in water flow cavities of the lens fixing cooling base body (2) and the cooling shell (1) through the first sealing groove (205), the second sealing groove (206), the first sealing ring (3) and the second sealing ring (4).

2. A lens cooling device for a shutter for a fiber laser according to claim 1, wherein: the outer diameter of the copper ring limiting snap ring (211) is larger than the outer diameter of the end face of the limiting annular baffle plate (210), and the inner diameter of the copper ring limiting snap ring (211) is smaller than the inner diameter of the end face of the limiting annular baffle plate (210).

3. A lens cooling device for a shutter for a fiber laser according to claim 1, wherein: the inner diameters of the first copper ring (5) and the second copper ring (7) are matched with the inner diameter of the copper ring limiting clamping ring (211), and the copper ring-lens-copper ring structure can be limited at the inner diameter of the copper ring limiting clamping ring (211).

4. A lens cooling device for a shutter for a fiber laser according to claim 1, wherein: a circle of fixing groove (207) is formed in the pressing ring fixing annular baffle (209), and a headless screw (9) is screwed into the lens fixing cooling base body (2) and then props against the fixing groove (207) during assembly.

5. A lens cooling device for a shutter for a fiber laser according to claim 1, wherein: first copper ring (5), second copper ring (7) and treat the external diameter and basic body barrel (208) internal diameter size phase-match of cooling lens (6), first copper ring (5) and second copper ring (7) are pressed at lens (6) both ends, first copper ring (5), treat that cooling lens (6) and second copper ring (7) set up in basic body barrel (208), and copper ring-lens-copper ring structure one end contacts with the spacing snap ring of copper ring (211) inside diameter portion, basic body barrel (208) are stretched out to the other end, compress tightly through clamping ring (8) that set up in clamping ring fixed ring shape baffle (209) inner circle.