CN2469589Y

CN2469589Y - Cooling device used for high-power CO2 laser output window

Info

Publication number: CN2469589Y
Application number: CN 01212597
Authority: CN
Inventors: 陈清明
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-02-28
Filing date: 2001-02-28
Publication date: 2002-01-02
Anticipated expiration: 2011-02-28

Abstract

The utility model relates to a cooling device used for a high-power CO2 laser output window, and belongs to the field of laser and mainly resolves the problem that the existing window cooling device has low power, shore life span and high cost. The cooling device with the laser output window at least comprises a laser window, a laser cooling support rack, a circulating water jacket, a cyclone gas cooling component, a palace type spring, a sealed ring and a supported flange. The window cooling device makes use of circulating water to cool the annular ring at window flanges and a vortex airflow cooling window center to jointly endure a maximum laser power of 20kW. The life span of the utility model under 10kW power can last 2,000 hours. The utility model also has low cost.

Description

A kind of high power CO that is used for 2The cooling device of laser output window

The utility model belongs to laser field, is mainly used in high power CO ₂Laser system.

High power CO ₂Laser output window is the element of most critical in the laser complete set of equipments.Do not have output window, just do not have laser.Laser output window (hereinafter to be referred as window) has two basic functions: the one, constitute laserresonator with speculum and other element, and produce laser generation and obtain laser output by laserresonator; The 2nd, isolation laser working gas (CO ₂The gas of laser is sealed in the shell of laser) and atmosphere.At present, industrial high power CO ₂The used material of laser window mainly is GaAs (GaAs) crystal and zinc selenide (ZnSe) crystal, and they are all very expensive, and less than 1000 hours, belong to consumable accessory useful life usually.The average power level of common laser window is about 5 kilowatts now.10 kilowatts laser window is relatively more rare and the life-span is very short, generally is no more than 500 hours.The restriction of power level has just caused CO ₂The commercial Application of laser is greatly limited.At present, water-cooling pattern is generally adopted in the cooling of laser window both at home and abroad.Concrete way is to do a cooling device, with heat conduction preferably fine copper do window bracket, be processed with laser output (being generally circle) and recirculated water cooling passage on this window bracket, cool off support with the water of constant temperature.Window is assemblied on the water cooled holder, and circumference has a circle sealing ring to be used for air seal, has a circle to be close to support simultaneously, and the heat conduction that relies on this circular zone exactly will be taken away owing to window absorbs the heat that causes, reach the purpose of cooling laser window.In general, the area of the circular salband of laser window is about 1/10th to 1/5th of window area, because so window center must can't be cooled off by laser, therefore window is that central temperature height, edge temperature are low, is to arrive a stable temperature distribution state as the case may be at last.Power is high more, and central temperature is high more.The edge temperature is high more, and central temperature is also high more.The central temperature of window and edge temperature always have a temperature gradient.When temperature arrival in center was enough to cause destruction or bursts, window will be scrapped.According to present statistics, no matter be the window material of high-quality how, the practicability window of this type of cooling, power level can only be about 5 kilowatts, and the life-span is no more than 1000 hours; 10 kilowatts laser window is relatively more rare and the life-span is very short, generally is no more than 500 hours; The price of at present such laser window is about 500 to 800 US dollars, and actual cost is than higher.This shows that the major defect of present window cooling device is to use power level low, the life-span is short, the cost height.

At the above-mentioned shortcoming of original cooling device, the purpose of this utility model provides a kind of high power CO ₂The cooling device of laser output window, this is a kind of window cooling device that window edge annulus and vortex air-flow cooling window center combines that is cooled with circulating water.The maximum laser power level that it bears can reach 20 kilowatts, reaches 2000 hours in the useful life of 10 kw of power levels.

1, to achieve these goals, the utility model has adopted following design structure.This laser window cooling device, which comprises at least laser window, window cooling support, cyclic water jacket, rotational flow gas cooling package, palace type spring, sealing ring, supported flange composition, its laser window is arranged on the step of circle in the window cooling support, be embedded with sealing ring and packing washer at the laser window circumference, the outer ring of rotational flow gas cooling package and laser window periphery are fitted, and fix with supported flange; Be furnished with palace type spring in the upper surface of rotational flow gas cooling package, and fix with supported flange; Be equipped with the aperture of giving vent to anger on the upper surface inner ring of described rotational flow gas cooling package, its aperture is between 0.2 to 1mm; The palace type spring that described rotational flow gas cooling package upper surface is arranged, it is provided with the elongated slot of buffering distortion along periphery; Described window cooling support lower end cylindrical is provided with the annular cyclic water jacket along support, and the one end is a water inlet end, and the other end is the water side.

Further use description of drawings structure of the present utility model below:

Accompanying drawing 1 is an overall structure schematic diagram of the present utility model;

Accompanying drawing 2 is rotational flow gas cooling package structural representations in the accompanying drawing 1.

(1) is laser window among its Fig. 1, and its material is GaAs (GaAs) crystal or zinc selenide (ZnSe) crystal; (2) be window cooling support, its material is a red copper, and major requirement is that heat conduction is good, has processed circulating water channel on the cooling support; (3) be cyclic water jacket; (4), (5) are respectively into and out of circulating water pipe; (6) be sealing ring, this is the industrial rubber sealing ring of standard; (7) for compressing the packing ring of sealing ring; (8) for compressing the threaded flange of sealing ring, (6), (7), (8) are the effects that window and the sealing problem of laser play isolation laser gas and atmosphere that solves, atmospheric pressure makes the outer ring of window be close to again to cool off support and conduct the heat that is produced by window absorption laser in addition; (9) be the rotational flow gas cooling package, its concrete structure as shown in Figure 2; (10) be palace type spring near the rotational flow gas cooling package; (11) be the threaded flange that compresses the rotational flow gas cooling package, (9), (10), (11) have guaranteed that from structure the rotational flow gas cooling package plays the effect of last minute heat of conduction window on the one hand, more important is the centre of cooling off window by rotational flow gas on the other hand, has the spring existence just can discharge the stress that causes owing to the window thermal expansion in addition and prevents that window from bursting.(12) are rotational flow gas cooling outer rings among Fig. 2, and material is a red copper; (13) be air inlet pipe; (14) be rotational flow gas cooling inner ring, on inner ring, be equipped with a plurality of apertures of giving vent to anger, the diameter in hole is between 0.2 to 1 millimeter, the direction in hole is both certain angle of inclination to be arranged axially, again certain angle of inclination is being arranged tangentially, gas just not only blows to the center but also can produce air-flow rotation back and flows out from the center like this, and the heat on the window takes away that the temperature that makes window reduces and holding temperature is even the most at last.In a word, such cooling device be cooled with circulating water on the one hand window edge annulus effectively with window edge cooling, on the other hand with vortex air-flow cooling window center the temperature of window center is reduced and holding temperature even, the laser power that reach high efficiency cooling window, improves window bears level, avoid destroying, improving at not too high power level the purpose in window life-span.

Superiority of the present utility model is, high efficiency cooling laser window, laser window to bear power level height, life-span long, reduced use cost in fact significantly.

An application example of the present utility model is as follows: GaAs (GaAs) window that uses 60 millimeters of diameters, transmitance is 36%, overall absorption rate behind the window plated film is no more than 1.5%, the width of edge recirculated water cooling annulus is 6 millimeters, the logical light mouth diameter of laser window is 48 millimeters, the gas pressure that produces eddy airstream is 0.5 kg/cm, the cost of such cooling device has only increased less than 20 US dollars on original basis, but the power that bears laser is original more than 2 times (10 kilowatts to 20 kilowatts), be more than original 4 times (2000 hours) useful life of window.

Claims

1, a kind of high power CO that is used for ₂The cooling device of laser output window, which comprises at least laser window, window cooling support, cyclic water jacket, rotational flow gas cooling package, palace type spring, sealing ring, supported flange composition, it is characterized in that: laser window is arranged on the step of circle in the window cooling support, be embedded with sealing ring and packing washer at the laser window circumference, the outer ring of rotational flow gas cooling package and laser window periphery are fitted, and fix with supported flange; Be furnished with palace type spring in the upper surface of rotational flow gas cooling package, and fix with supported flange.

2, a kind of high power CO that is used for according to claim 1 ₂The cooling device of laser output window is characterized in that: be equipped with the aperture of giving vent to anger on the upper surface inner ring of described rotational flow gas cooling package, its aperture is between 0.2 to 1mm.

3, a kind of high power CO that is used for according to claim 1 ₂The cooling device of laser output window is characterized in that: the palace type spring that described rotational flow gas cooling package upper surface is arranged, it is provided with the elongated slot of buffering distortion along periphery.

4, a kind of high power CO that is used for according to claim 1 ₂The cooling device of laser output window is characterized in that: described window cooling support lower end cylindrical is provided with the annular cyclic water jacket along support, and the one end is a water inlet end, and the other end is the water side.