CN222381050U - Carbon dioxide laser tube - Google Patents

Abstract

The utility model relates to a carbon dioxide laser tube, which comprises a gas storage tube, a water cooling tube, a discharge tube, an outer sleeve, a support tube and an inner sleeve, wherein the gas storage tube, the water cooling tube and the discharge tube are sleeved in sequence from outside to inside, the outer sleeve, the support tube, the inner sleeve and the water cooling tube are sleeved in sequence from outside to inside and are abutted, the outer sleeve is connected with the gas storage tube, the inner sleeve can axially slide relative to the water cooling tube, and/or the support tube can axially slide relative to the inner sleeve, and/or the outer sleeve can axially slide relative to the support tube. The utility model can support the water-cooled tube through the outer sleeve, the support cylinder and the inner sleeve, improves the coaxiality between the water-cooled tube and the gas storage tube, and simultaneously, can adapt to the expansion difference between the gas storage tube and the water-cooled tube through the sliding among the outer sleeve, the support cylinder and the inner sleeve, thereby improving the stability of the output light beam and the output power of the laser tube.

Description

Carbon dioxide laser tube

Technical Field

The utility model relates to the field of laser tubes, in particular to a carbon dioxide laser tube.

Background

The present carbon dioxide laser tube generally comprises a discharge tube, a water cooling tube sleeved outside the discharge tube, a gas storage tube sleeved outside the water cooling tube, a cathode electrode and an anode electrode respectively arranged at two ends of the discharge tube, and an output window and a reflecting window arranged at two ends of the gas storage tube, wherein the reflecting window comprises a reflecting lens and a reflecting lens cooling device, the output window comprises an output lens and an output lens cooling device, carbon dioxide gas and other auxiliary gases are filled in the discharge tube, when a high voltage is applied to the electrodes, glow discharge is generated in the discharge tube, photons are reflected by the reflecting lens and the output lens, so that photons repeatedly vibrate in the discharge tube to form a laser beam, and the laser beam is emitted from the output lens to obtain a final laser beam.

In order to improve the stability of the output power of the laser beam, the coaxiality of the discharge tube, the water-cooled tube and the gas storage tube needs to be improved as much as possible, and one end of the water-cooled tube corresponding to the positive electrode of the discharge tube is relatively fixed with the gas storage tube, so that one end of the water-cooled tube corresponding to the negative electrode of the discharge tube needs to be supported or fixed. At present, a glass column is used for connecting a water-cooled tube with a gas storage tube, so that the cathode electrode of the water-cooled tube is supported and fixed.

However, in carrying out the present utility model, the inventors have found that this support has at least the following problems:

Because the heat dissipation difference of the gas storage tube and the water cooling tube during operation of the laser tube can cause different expansion amounts of the gas storage tube and the water cooling tube during operation due to thermal expansion, at the moment, the joint of the glass column can generate larger force, so that the water cooling tube is pulled to deform, coaxiality among all tube bodies is affected, and the output light beam of the laser tube is unstable and the output power is reduced.

Disclosure of utility model

The utility model aims to overcome the defects in the prior art and provide a carbon dioxide laser tube.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

The utility model provides a carbon dioxide laser tube, which comprises a gas storage tube, a water cooling tube, a discharge tube, an outer sleeve, a supporting cylinder and an inner sleeve, wherein the gas storage tube, the water cooling tube and the discharge tube are sleeved in sequence from outside to inside, the outer sleeve, the supporting cylinder, the inner sleeve and the water cooling tube are sleeved in sequence from outside to inside and are abutted, the outer sleeve is connected with the gas storage tube, the inner sleeve can axially slide relative to the water cooling tube, and/or the supporting cylinder can axially slide relative to the inner sleeve, and/or the outer sleeve can axially slide relative to the supporting cylinder.

Wherein, outside sleeve, support section of thick bamboo and inside sleeve can cooperate and support the water-cooled tube, improve the axiality between water-cooled tube and the gas storage pipe, simultaneously, can adapt to the flexible volume difference between gas storage pipe and the water-cooled tube through the slip between outside sleeve, support section of thick bamboo and the inside sleeve.

In a preferred embodiment of the present utility model, the friction force between the surfaces of the inner sleeve and the water-cooled tube that are abutted against each other is defined as a first friction force, the friction force between the support tube and the inner sleeve is defined as a second friction force, the friction force between the outer sleeve and the support tube is defined as a third friction force, and the surfaces of the inner sleeve and the water-cooled tube that are abutted against each other have a first friction coefficient such that the first friction force is smaller than the second friction force and the third friction force. Therefore, when sliding occurs, the inner sleeve and the water cooling pipe are subjected to axial sliding preferentially, so that the supporting cylinder is prevented from sliding and being clamped between the outer sleeve and the inner sleeve.

As a preferred embodiment of the present utility model, the length of the inner sleeve is greater than or equal to 2.5 times the diameter of the inner sleeve. The condition that the inner sleeve is clamped is avoided.

As a preferred embodiment of the present utility model, the cylinder of the inner sleeve has a first slit, from which the inner sleeve can be outwardly opened. Thereby reducing friction between the inner sleeve and the water cooled tube.

In a preferred embodiment of the present utility model, the body of the support cylinder has a second slit, and the body of the support cylinder is outwardly expandable by the second slit, and the first slit and the second slit are aligned when the support cylinder is fitted over the inner sleeve. Thereby reducing the obstruction of the support cylinder to the opening of the inner sleeve.

The support cylinder comprises a cylinder body and at least three supporting legs, wherein all the supporting legs are connected to the cylinder body, the cylinder body is sleeved and abutted against the inner sleeve, and the free ends of all the supporting legs are abutted outwards against the outer sleeve.

As a preferred embodiment of the present utility model, the number of the support cylinders is at least 2, and a plurality of the support cylinders are spaced apart along the axial direction of the inner sleeve. Thereby providing sufficient supporting force.

As a preferable scheme of the utility model, the inner sleeve is sleeved at one end of the water cooling tube corresponding to the cathode electrode of the discharge tube. Thereby improving the supporting effect on the end of the water-cooled tube corresponding to the cathode electrode of the discharge tube.

As a preferred embodiment of the present utility model, the inner sleeve is a metal tube.

As a preferable scheme of the utility model, the outer sleeve is a glass tube, a glass column is arranged between the outer sleeve and the gas storage tube, and two ends of the glass column are respectively connected with the outer sleeve and the gas storage tube in an integrated way.

In a second aspect, the present utility model provides a method for processing a carbon dioxide laser tube, which is used for processing a carbon dioxide laser tube according to any one of the above schemes, and includes the steps of:

The inner sleeve, the supporting cylinder and the outer sleeve are sleeved on the water cooling pipe, and then the outer sleeve is connected with the gas storage pipe in a burning and casting mode.

In summary, due to the adoption of the technical scheme, the beneficial effects of the utility model are as follows:

1. according to the carbon dioxide laser tube, the water-cooled tube can be supported through the arrangement of the outer sleeve, the supporting cylinder and the inner sleeve, so that the coaxiality between the water-cooled tube and the gas storage tube is improved, and meanwhile, the difference of the expansion and contraction amount between the gas storage tube and the water-cooled tube can be adapted through the sliding among the outer sleeve, the supporting cylinder and the inner sleeve. Specifically, when the situation that different expansion and contraction amounts are generated between the gas storage tube and the water cooling tube due to thermal expansion occurs, adaptive axial sliding is generated between the support tube and the inner sleeve, and/or between the inner sleeve and the water cooling tube, and/or between the outer sleeve and the support tube under the drive of the gas storage tube and the water cooling tube, deformation possibly generated by the water cooling tube is eliminated, coaxiality between tube bodies is always kept in a relatively stable state, and stability of output light beams and output power of the laser tube is further improved.

Drawings

Fig. 1 is a schematic overall structure of embodiment 1 of the present utility model.

Fig. 2 is a schematic view in the direction A-A in fig. 1.

Fig. 3 is a schematic view of a part of the structure of embodiment 1 of the present utility model.

The drawing shows 1-gas storage tube, 2-water cooling tube, 3-discharge tube, 4-positive electrode, 5-negative electrode, 6-internal sleeve, 61-first slit, 7-supporting cylinder, 71-second slit, 72-supporting leg, 8-external sleeve, 81-glass column, 9-spiral tube.

Detailed Description

The present utility model will be described in further detail with reference to test examples and specific embodiments. It should not be construed that the scope of the above subject matter of the present utility model is limited to the following embodiments, and all techniques realized based on the present utility model are within the scope of the present utility model.

Unless specifically stated otherwise, in the description of specific embodiments of the present utility model, terms of expression of orientation or positional relationship in which "upper", "lower", "left", "right", "center", "inside", "outside", "etc. are indicated are all based on the expression of orientation or positional relationship shown in the drawings, or are the orientation or positional relationship in which the inventive product/apparatus/device is put when used conventionally. These directional or positional terms are merely used to facilitate description of the aspects of the utility model or to simplify the description of the specific embodiments, so that a skilled artisan will readily understand the aspects, rather than to indicate or imply that a particular device/component/element must have a particular orientation or be constructed and operated in a particular positional relationship, and thus should not be construed as limiting the utility model.

Furthermore, the terms "horizontal," "vertical," "overhang," "parallel," and the like, if any, do not denote the requirement that the corresponding apparatus/component/element be absolutely horizontal or vertical or overhang or parallel, but may be slightly inclined or offset. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined. Or may be simply understood as a corresponding device/component/element, disposed in a "horizontal", "vertical", "overhanging", "parallel" or the like direction, capable of having an error/deviation within + 10%, more preferably within + 8%, more preferably within + 6%, more preferably within + 5%, more preferably within + 4% of the corresponding directional arrangement. As long as the corresponding device/component/element is within the error/deviation range, it is still possible to achieve its function in the solution according to the utility model.

Furthermore, the appearances of the terms "first," "second," "third," etc. are merely descriptive for distinguishing between similar or identical components and not necessarily for describing a relative importance of a particular component or components.

Furthermore, in the description of the embodiments of the present utility model, "several", "a plurality" and "a number" represent at least 2. There may be any case of 2, 3, 4, 5, 6, 7, 8, 9, etc., and even more than 9.

Furthermore, in the description of the technical solutions of the present utility model, unless explicitly specified/limited/restricted otherwise, the occurrence of the terms "set", "install", "connect", "provided", "laid" and "arranged" shall be understood in a broad sense, for example, as a fixed connection, as a removable connection, as an integral connection, as a connection means commonly used in the art, such as welding, riveting, bolting, screwing, etc. The connection may be mechanical connection, electrical connection or communication connection, direct connection, indirect connection through an intermediate medium, or communication between two elements.

Where not specifically indicated, in the description of the embodiments of the present utility model, "axial" refers to the axial direction of the discharge tube of the carbon dioxide laser tube.

Example 1

As shown in fig. 1 to 3, embodiment 1 provides a carbon dioxide laser tube, which comprises a gas storage tube 1, a water cooling tube 2 and a discharge tube 3, wherein the gas storage tube 1, the water cooling tube 2 and the discharge tube 3 are sequentially sleeved from outside to inside, carbon dioxide gas and other auxiliary gases are filled in the discharge tube 3, and two ends of the discharge tube 3 are respectively provided with an anode electrode 4 and a cathode electrode 5. When a high voltage is applied to the electrodes, glow discharge is generated in the discharge tube 3, and photons are repeatedly oscillated in the discharge tube 3 to form a laser beam and emitted through reflection by the lens.

On this basis, it is necessary to support the water-cooled tube 2, and this embodiment adopts a non-fixedly connected support structure, specifically, an outer sleeve 8, a support cylinder 7 and an inner sleeve 6 are disposed between the gas storage tube 1 and the water-cooled tube 2, so that the inner sleeve 6 is sleeved and abutted to the water-cooled tube 2, the support cylinder 7 is sleeved and abutted to the inner sleeve 6, and the outer sleeve 8 is sleeved and abutted to the support cylinder 7, and meanwhile, the outer sleeve 8 is connected with the support cylinder 7. At this time, the outer sleeve 8, the support cylinder 7 and the inner sleeve 6 cooperate together to intensively support the water-cooled tube 2, so that the coaxiality of the water-cooled tube 2 and the air storage tube 1 is improved.

When the laser tube works, when the situation that different expansion and contraction amounts are generated between the gas storage tube 1 and the water cooling tube 2 due to thermal expansion occurs, adaptive axial sliding is generated between the support tube 7 and the inner sleeve 6 and/or between the inner sleeve 6 and the water cooling tube 2 and/or between the outer sleeve 8 and the support tube 7 under the driving of the gas storage tube 1 and the water cooling tube 2, so that deformation possibly generated by the water cooling tube 2 is eliminated or even eliminated, coaxiality between tube bodies is always kept in a relatively stable state, and stability of output light beams and output power of the laser tube is further improved.

The inner sleeve 6 may be disposed at any axial position of the water-cooled tube 2 except for one end corresponding to the anode electrode 4 of the discharge tube 3, for example, at a middle position of the water-cooled tube 2 or one end corresponding to the cathode electrode 5 of the discharge tube 3 of the water-cooled tube 2, and at this time, the inner sleeve 6 may support the water-cooled tube 2. The inner sleeve 6 is preferably sleeved at one end of the water-cooled tube 2 corresponding to the cathode 5 of the discharge tube 3, so that the supporting effect of the water-cooled tube 2 corresponding to the cathode 5 of the discharge tube 3 is improved, the offset phenomenon of the water-cooled tube 2 and the discharge tube 3 caused by shaking of the laser tube is reduced, and the output power reduction and the unstable output light spots of the laser tube during movement are reduced.

When the carbon dioxide laser tube is provided with the spiral tube 9 at the cathode electrode 5, the inner sleeve 6 can be positioned on one side of the spiral tube 9 close to the anode electrode 4, and the distance between the inner sleeve 6 and the spiral tube 9 is 5cm-10cm, and under the distance, the inner sleeve 6 can still be regarded as being sleeved at one end of the water cooling tube 2 corresponding to the cathode electrode 5 of the discharge tube 3.

The support tube 7 may be any member that can be disposed between the outer sleeve 8 and the inner sleeve 6 and that supports the gap between the outer sleeve 8 and the inner sleeve 6.

In one or more embodiments, as shown in fig. 2 to 3, the support cylinder 7 includes a cylinder body and at least three legs 72, all the legs 72 are connected to the cylinder body, the cylinder body is sleeved and abutted against the outer surface of the inner sleeve 6, and the free ends of all the legs 72 are abutted outwards against the inner surface of the outer sleeve 8. The device has simple structure and lower cost, and is more suitable for the operation mechanism of the carbon dioxide laser tube.

Specifically, the three legs 72 of the support cylinder 7 may be one elastic leg and two fixed legs, the elastic legs having a blade length greater than that of the fixed legs. The supporting cylinder 7 under the structure can well counteract the bending phenomenon of the water-cooled tube under the influence of gravity, improves the coaxiality of the discharge tube 3, the water-cooled tube 2 and the gas storage tube 1, and reduces the possibility of unstable light beam and power drop of the laser tube. In addition, the support cylinder 7 can provide a vertical support force when the laser tube is subjected to external impact, so that the influence of the water cooling tube 2 is reduced.

In addition, compared with a four-corner support bracket, the design of the three support legs utilizes the stability principle of a triangle, and the stability of the support cylinder 7 is improved. And save space more, the material of being convenient for when producing is cut more, make every landing leg can be longer, satisfy water-cooled tube 2 and gas storage pipe and have great radial distance's demand, also offset external impact better.

Because the blade length of the elastic support leg is longer than that of the fixed support leg, when only one support leg 72 is the elastic support leg, the length of the elastic support leg can be relatively longer, thereby meeting the requirement that a larger radial distance exists between the water cooling pipe 2 and the air storage pipe 1, and better counteracting the external impact force.

The support cylinder 7 may be an integrated carbon dioxide laser tube discharge tube support cylinder as mentioned in CN202333427U, or a support cylinder for a carbon dioxide laser tube as mentioned in CN 206148791U.

Wherein, as shown in fig. 2 to 3, the body of the support cylinder 7 has a second slit 71, and the body of the support cylinder 7 can be outwardly opened by the second slit 71.

Wherein the number of the support cylinders 7 may be 1, preferably at least 2, as shown in fig. 1, a plurality of the support cylinders 7 are spaced apart in the axial direction of the inner sleeve 6, thereby providing a sufficient supporting force. On the basis of this preferred embodiment, 2 support cylinders 7 are preferably respectively fitted around both ends of the inner sleeve 6.

The sliding among the outer sleeve 8, the support cylinder 7, the inner sleeve 6 and the water-cooled tube 2 will be described in detail, wherein the friction between the surfaces of the inner sleeve 6 and the water-cooled tube 2 abutting each other is defined as a first friction, the friction between the support cylinder 7 and the inner sleeve 6 is defined as a second friction, and the friction between the outer sleeve 8 and the support cylinder 7 is defined as a third friction.

It will be appreciated that if the expansion and contraction amounts of the gas storage tube and the water cooling tube are different, the inner sleeve merely slides axially relative to the water cooling tube if the first friction force is far less than the second friction force and the third friction force, the support tube merely slides axially relative to the inner sleeve if the second friction force is far less than the first friction force and the third friction force, the outer sleeve merely slides axially relative to the support tube if the third friction force is far less than the first friction force and the second friction force, and the outer sleeve 8, the support tube 7, the inner sleeve 6 and the water cooling tube 2 may slide synchronously if the first friction force, the second friction force and the third friction force are similar or equal.

In one or more embodiments, considering that the length of the support cylinder 7 in the axial direction is short, when sliding occurs between the support cylinder 7 and other components, there is a possibility that the support cylinder 7 is caught between the inner sleeve 6 and the outer sleeve 8 due to the deflection of the support cylinder 7 itself, and therefore, it is preferable to reduce or even eliminate deformation that may occur to the water-cooled tube 2 by the axial sliding between the inner sleeve 6 and the water-cooled tube 2.

Specifically, by making the surfaces of the inner sleeve 6 and the water-cooled tube 2 abutting each other sufficiently smooth, a suitable first friction coefficient can be formed between the surfaces of the inner sleeve 6 and the water-cooled tube 2 abutting each other such that the first friction force is smaller than the second friction force and the third friction force. Therefore, when different expansion and contraction amounts are generated between the air storage pipe 1 and the water cooling pipe 2 due to thermal expansion, axial sliding is preferentially generated between the inner sleeve 6 and the water cooling pipe 2, sliding is not easily generated between the support cylinder 7 and other components, and the possibility that the support cylinder 7 is clamped between the inner sleeve 6 and the outer sleeve 8 is reduced.

On this basis, in order to reduce the possibility that the inner sleeve 6 will also become stuck, it is preferable that the length of the inner sleeve 6 is greater than or equal to 2.5 times, and in particular may be 3 times, the diameter of the inner sleeve 6 is equal to or slightly smaller than the diameter of the water-cooled tube 2.

In one or more embodiments, the connection between the inner sleeve 6 and the water-cooled tube 2 may be an interference fit, or a slit may be provided on the inner sleeve 6, so that the inner sleeve 6 can be clamped on the water-cooled tube 2 by making the inner sleeve 6 elastically deform outwards from the slit.

In order to reduce the friction between the inner sleeve 6 and the water-cooled tube 2, a solution may be chosen in which a slit is provided in the inner sleeve 6, in particular, as shown in fig. 2 to 3, a first slit 61 may be provided in the cylinder of the inner sleeve 6 in the axial direction, wherein the first slit 61 cuts one side of the inner sleeve 6 so that the inner sleeve 6 can be outwardly opened by the first slit 61. In the case of the described solution, in which a slit is provided in the inner sleeve 6, the pressure exerted by the inner sleeve 6 on the water-cooled tube 2 is smaller than in the case of the interference fit between the inner sleeve 6 and the water-cooled tube 2, whereby the friction between the inner sleeve 6 and the water-cooled tube 2 is reduced, so that when a different amount of expansion and contraction between the gas reservoir 1 and the water-cooled tube 2 occurs due to thermal expansion, an axial slip is preferentially produced between the inner sleeve 6 and the water-cooled tube 2.

On the basis of the embodiment, the inner sleeve 6 may be a metal tube, the inner wall of which is smooth, so that a proper first friction coefficient is formed between the surfaces of the inner sleeve 6 and the water-cooled tube 2, and meanwhile, the wall thickness of the metal tube is thinner, so that the metal tube can generate a certain elastic deformation outwards from the cutting seam.

In one or more embodiments, for the engagement of the support cylinder 7 with the inner sleeve 6, it is preferable to align the first slit 61 and the second slit 71 when the support cylinder 7 is sleeved outside the inner sleeve 6, so that the support cylinder 7 and the inner sleeve 6 can be synchronously opened by the first slit 61 and the second slit 71, thereby reducing the obstruction force generated by the support cylinder 7 on the opening of the inner sleeve 6 and facilitating the sliding of the inner sleeve 6 on the water cooling pipe 2.

In one or more embodiments, the outer sleeve 8 may be a glass tube, a glass column 81 is disposed between the outer sleeve 8 and the gas storage tube 1, and two ends of the glass column 81 are integrally connected with the outer sleeve 8 and the gas storage tube 1 through firing and casting, so that the outer sleeve 8 is connected with the gas storage tube 1.

The number of the glass pillars 81 is preferably plural, and the plural glass pillars 81 are disposed on the same circumferential surface of the outer sleeve 8. I.e. at least two glass studs 81 are arranged on one cross section (circumferential surface) of said outer sleeve 8. Wherein, all glass posts 81 are evenly spaced along the same circumference of the outer sleeve 8, thereby improving the stability and reliability of the support, and improving the coaxiality of the outer sleeve 8 as much as possible when the gas storage tube 1 expands due to thermal expansion.

Example 2

There is provided a processing method for processing a carbon dioxide laser tube as described in any one of embodiment 1, comprising the steps of:

The inner sleeve 6, the supporting cylinder 7 and the outer sleeve 8 are sleeved on the water cooling pipe 2, and then the outer sleeve 8 is connected with the gas storage pipe 1 in a burning and casting mode.

Wherein, there may be processing errors in the inner sleeve 6, the supporting cylinder 7 and the outer sleeve 8, and at the same time, when the inner sleeve 6, the supporting cylinder 7 and the outer sleeve 8 are sleeved on the water-cooled tube 2, a position shift may occur, for example, when the inner sleeve 6 is opened outwards from the first slit 61, or when the cylinder body of the supporting cylinder 7 is opened outwards from the second slit 71, the cross section of the inner sleeve 6 or the supporting cylinder 7 is changed from a circular shape to an approximate circular shape. Therefore, the inner sleeve 6, the supporting cylinder 7 and the outer sleeve 8 are sleeved on the water cooling pipe 2, and then the outer sleeve 8 is connected with the air storage pipe 1 in a burning mode, so that the position of the air storage pipe 1 can be adjusted through burning of the outer sleeve 8, errors or position deviation in the machining process are adapted, stable supporting effects can be provided for the inner sleeve 6, the supporting cylinder 7 and the outer sleeve 8, machining accuracy is improved, and coaxiality of the air storage pipe 1 and the water cooling pipe 2 is improved.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. The carbon dioxide laser tube comprises a gas storage tube (1), a water cooling tube (2) and a discharge tube (3) which are sequentially sleeved from outside to inside, and is characterized by further comprising an outer sleeve (8), a supporting cylinder (7) and an inner sleeve (6), wherein the outer sleeve (8), the supporting cylinder (7), the inner sleeve (6) and the water cooling tube (2) are sequentially sleeved from outside to inside and are abutted;

Wherein the inner sleeve (6) can axially slide relative to the water-cooled tube (2), and/or the support cylinder (7) can axially slide relative to the inner sleeve (6), and/or the outer sleeve (8) can axially slide relative to the support cylinder (7).

2. A carbon dioxide laser tube according to claim 1, characterized in that the friction between the surfaces of the inner sleeve (6) and the water-cooled tube (2) that abut each other is defined as a first friction, the friction between the support cylinder (7) and the inner sleeve (6) is defined as a second friction, and the friction between the outer sleeve (8) and the support cylinder (7) is defined as a third friction;

The inner sleeve (6) and the water-cooled tube (2) are abutted with each other, and a first friction coefficient is arranged between the surfaces, so that the first friction force is smaller than the second friction force and the third friction force.

3. A carbon dioxide laser tube according to claim 1, characterized in that the length of the inner sleeve (6) is greater than or equal to 2.5 times the diameter of the inner sleeve (6).

4. A carbon dioxide laser tube according to claim 1, characterized in that the barrel of the inner sleeve (6) has a first slit (61), the inner sleeve (6) being expandable outwardly from the first slit (61).

5. A carbon dioxide laser tube according to claim 4, characterized in that the barrel of the support barrel (7) has a second slit (71), the barrel of the support barrel (7) being expandable outwardly from the second slit (71);

When the support cylinder (7) is sleeved outside the inner sleeve (6), the first slit (61) and the second slit (71) are aligned.

6. A carbon dioxide laser tube according to any of claims 1-5, characterized in that the support barrel (7) comprises a barrel and at least three legs (72), all the legs (72) being connected to the barrel, the barrel being sleeved over and abutting the inner sleeve (6), the free ends of all the legs (72) abutting the outer sleeve (8) outwards.

7. A carbon dioxide laser tube according to any of claims 1-5, characterized in that the number of support cylinders (7) is at least 2, a plurality of support cylinders (7) being spaced apart along the axial direction of the inner sleeve (6).

8. A carbon dioxide laser tube according to any of claims 1-5, characterized in that the inner sleeve (6) is arranged around the end of the water-cooled tube (2) corresponding to the cathode electrode (5) of the discharge tube (3).

9. A carbon dioxide laser tube according to any of claims 1-5, in which the inner sleeve is a metal tube.

10. A carbon dioxide laser tube according to any of claims 1-5, characterized in that the outer sleeve (8) is a glass tube, a glass column (81) is arranged between the outer sleeve (8) and the gas storage tube (1), and two ends of the glass column (81) are integrally connected with the outer sleeve (8) and the gas storage tube (1) respectively.