Carbon dioxide laser tube

Abstract

The utility model relates to a carbon dioxide laser tube, which comprises a gas storage tube, a water cooling tube and a discharge tube which are sequentially sleeved from outside to inside, and further comprises an outer sleeve, a support cylinder and an inner sleeve, the outer sleeve, the supporting cylinder, the inner sleeve and the water cooling pipe are sequentially arranged from outside to inside in a sleeving mode and abut against one another. The outer sleeve is connected with the gas storage pipe; wherein the inner sleeve can axially slide relative to the water cooling pipe; 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. The water-cooling pipe can be supported through the outer sleeve, the supporting cylinder and the inner sleeve, the coaxiality between the water-cooling pipe and the gas storage pipe is improved, meanwhile, through sliding among the outer sleeve, the supporting cylinder and the inner sleeve, the expansion and contraction difference value between the gas storage pipe and the water-cooling pipe can be adapted, and the sealing performance of the gas storage pipe is improved. And the stability of output light beams and output power of the laser tube is improved.

Description

Technical Field

[0001] The utility model relates to the field of laser tubes, in particular to a carbon dioxide laser tube. Background Art

[0002] The current carbon dioxide laser tube usually includes a discharge tube, a water cooling tube sleeved on the outside of the discharge tube, a gas storage tube sleeved on the outside of the water cooling tube, a cathode electrode and an anode electrode respectively arranged at both ends of the discharge tube, and an output window and a reflection window arranged at both ends of the gas storage tube, the reflection window includes a reflection lens and a reflection lens cooling device, the output window includes an output lens and an output lens cooling device, and the discharge tube is filled with carbon dioxide gas and other auxiliary gases; when a high voltage is applied to the electrodes, a glow discharge is generated in the discharge tube, which is reflected by the reflection lens and the output lens, so that photons repeatedly oscillate in the discharge tube to form a laser beam, which is emitted from the output lens to obtain the final laser beam.

[0003] In order to improve the stability of the laser beam output power, it is necessary to improve the coaxiality of the discharge tube, the water cooling tube and the gas storage tube as much as possible, and the end of the water cooling tube corresponding to the positive electrode of the discharge tube is relatively fixed to the gas storage tube, so it is necessary to support or fix the end of the water cooling tube corresponding to the negative electrode of the discharge tube. At present, most of them use glass columns to connect the water cooling tube and the gas storage tube, thereby supporting and fixing the negative electrode of the water cooling tube.

[0004] However, in the process of implementing the present invention, the inventors found that this support method has at least the following problems:

[0005] Due to the difference in heat dissipation between the gas storage tube and the water cooling tube when the laser tube is working, the gas storage tube and the water cooling tube may expand and contract differently due to thermal expansion during operation. At this time, a large force may be generated at the connection of the glass column, causing the water cooling tube to be deformed due to tension, affecting the coaxiality between the tubes, resulting in unstable output beam of the laser tube and reduced output power. Utility Model Content

[0006] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and provide a carbon dioxide laser tube.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0008] In a first aspect, the utility model provides a carbon dioxide laser tube, comprising a gas storage tube, a water cooling tube and a discharge tube which are sequentially sleeved from the outside to the inside, and also comprising an external sleeve, a supporting tube and an internal sleeve; the external sleeve, the supporting tube, the internal sleeve and the water cooling tube are sequentially sleeved and abutted from the outside to the inside; the external sleeve is connected to the gas storage tube; wherein the internal sleeve can slide axially relative to the water cooling tube; and / or the supporting tube can slide axially relative to the internal sleeve; and / or the external sleeve can slide axially relative to the supporting tube.

[0009] Among them, the outer sleeve, the support tube and the inner sleeve can cooperate to support the water cooling pipe, improve the coaxiality between the water cooling pipe and the gas storage pipe, and at the same time, can adapt to the difference in expansion and contraction between the gas storage pipe and the water cooling pipe through sliding between the outer sleeve, the support tube and the inner sleeve.

[0010] As a preferred solution of the utility model, the friction force between the mutually abutting surfaces of the inner sleeve and the water-cooling tube is defined as the first friction force, the friction force between the support tube and the inner sleeve is defined as the second friction force, and the friction force between the outer sleeve and the support tube is defined as the third friction force; the mutually abutting surfaces of the inner sleeve and the water-cooling tube have a first friction coefficient, so that the first friction force is smaller than the second friction force and the third friction force. As a result, when sliding occurs, the inner sleeve and the water-cooling tube are preferentially axially slid, preventing the support tube from sliding and getting stuck between the outer sleeve and the inner sleeve.

[0011] As a preferred solution of the utility model, the length of the inner sleeve is greater than or equal to 2.5 times the diameter of the inner sleeve, so as to avoid the inner sleeve from getting stuck.

[0012] As a preferred solution of the utility model, the cylinder body of the inner sleeve has a first slit, and the inner sleeve can be opened outward from the first slit, thereby reducing the friction between the inner sleeve and the water cooling tube.

[0013] As a preferred solution of the utility model, the body of the support tube has a second slit, and the body of the support tube can be opened outward from the second slit; when the support tube is sleeved outside the inner sleeve, the first slit and the second slit are aligned, thereby reducing the obstruction of the support tube to the opening of the inner sleeve.

[0014] As a preferred embodiment of the present invention, the support cylinder comprises a cylinder body and at least three legs, all of which are connected to the cylinder body; the cylinder body is sleeved and abuts against the inner sleeve, and the free ends of all of the legs abut against the outer sleeve outwardly.

[0015] As a preferred solution of the utility model, the number of the supporting tubes is at least 2, and the multiple supporting tubes are distributed at intervals along the axial direction of the inner sleeve, thereby providing sufficient supporting force.

[0016] As a preferred solution of the utility model, the internal sleeve is sleeved on the end of the water cooling tube corresponding to the cathode electrode of the discharge tube, thereby improving the supporting effect of the end of the water cooling tube corresponding to the cathode electrode of the discharge tube.

[0017] As a preferred solution of the present utility model, the inner sleeve is a metal tube.

[0018] As a preferred solution of the utility model, the outer sleeve is a glass tube, and a glass column is provided between the outer sleeve and the gas storage tube, and both ends of the glass column are respectively integrally connected to the outer sleeve and the gas storage tube.

[0019] In a second aspect, the utility model provides a method for processing a carbon dioxide laser tube, which is used to process a carbon dioxide laser tube as described in any of the above schemes, comprising the steps of:

[0020] Firstly, the inner sleeve, the support tube and the outer sleeve are sleeved on the water cooling tube, and then the outer sleeve is cast and connected to the gas storage tube.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0022] 1. The utility model provides a carbon dioxide laser tube, which can support the water-cooling tube and improve the coaxiality between the water-cooling tube and the gas storage tube through the arrangement of the external sleeve, the support tube and the internal sleeve. At the same time, it can adapt to the difference in expansion and contraction between the gas storage tube and the water-cooling tube through the sliding between the external sleeve, the support tube and the internal sleeve. Specifically, when the gas storage tube and the water-cooling tube have different expansion and contraction amounts due to thermal expansion, the support tube and the internal sleeve, and / or the internal sleeve and the water-cooling tube, and / or the external sleeve and the support tube will produce adaptive axial sliding driven by the gas storage tube and the water-cooling tube, thereby reducing or even eliminating the possible deformation of the water-cooling tube, so that the coaxiality between the various tube bodies always remains in a relatively stable state, thereby improving the stability of the laser tube output beam and output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the utility model.

[0024] Figure 2 for Figure 1 Schematic diagram of the middle AA direction.

[0025] Figure 3This is a partial structural diagram of Example 1 of the utility model.

[0026] Markings in the figure: 1-gas storage tube, 2-water cooling tube, 3-discharge tube, 4-positive electrode, 5-negative electrode, 6-inner sleeve, 61-first slit, 7-support tube, 71-second slit, 72-leg, 8-outer sleeve, 81-glass column, 9-spiral tube. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in combination with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0028] In the description of the specific embodiments of the present invention, unless otherwise specified, the terms indicating the orientation or position relationship such as "upper", "lower", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or the orientation or position relationship of the product / equipment / device of the utility model when it is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the utility model or simplifying the description in the specific embodiments, so that technicians can quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0029] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the utility model.

[0030] In addition, the expressions “first”, “second”, “third”, etc. that appear in the terms are merely descriptions used to distinguish the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0031] In addition, in the description of the embodiments of the present invention, "several", "multiple" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0032] In addition, in the description of the technical solution of the utility model, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two components.

[0033] Wherein, in the description of the embodiments of the present utility model, "axial direction" refers to the axial direction of the discharge tube of the carbon dioxide laser tube, unless otherwise specified.

[0034] Example 1

[0035] like Figures 1 to 3 As shown, embodiment 1 provides a carbon dioxide laser tube, including a gas storage tube 1, a water cooling tube 2 and a discharge tube 3 which are sequentially sleeved from the outside to the inside, the discharge tube 3 is filled with carbon dioxide gas and other auxiliary gases, and an anode electrode 4 and a cathode electrode 5 are respectively arranged at both ends of the discharge tube 3. When a high voltage is applied to the electrodes, a glow discharge is generated in the discharge tube 3, which is reflected by the lens, so that photons repeatedly oscillate in the discharge tube 3 to form a laser beam and emit.

[0036] On this basis, the water-cooling tube 2 needs to be supported. This embodiment adopts a non-fixed connection support structure. Specifically, an external sleeve 8, a support tube 7 and an internal sleeve 6 are arranged between the gas storage tube 1 and the water-cooling tube 2, so that the internal sleeve 6 is sleeved and abutted on the water-cooling tube 2, the support tube 7 is sleeved and abutted on the internal sleeve 6, and the external sleeve 8 is sleeved and abutted on the support tube 7, and the external sleeve 8 is connected to the support tube 7. At this time, the external sleeve 8, the support tube 7 and the internal sleeve 6 cooperate to centrally support the water-cooling tube 2, thereby improving the coaxiality of the water-cooling tube 2 and the gas storage tube 1.

[0037] When the laser tube is working, when the gas storage tube 1 and the water-cooling tube 2 have different expansion and contraction amounts due to thermal expansion, the support tube 7 and the inner sleeve 6 and / or the inner sleeve 6 and the water-cooling tube 2 and / or the outer sleeve 8 and the support tube 7 will produce adaptive axial sliding driven by the gas storage tube 1 and the water-cooling tube 2, thereby reducing or even eliminating the possible deformation of the water-cooling tube 2, so that the coaxiality between the various tube bodies always remains in a relatively stable state, thereby improving the stability of the output beam and output power of the laser tube.

[0038] The position where the inner sleeve 6 is sleeved on the water cooling tube 2 can be any axial position on the water cooling tube 2 except the end corresponding to the anode electrode 4 of the discharge tube 3, for example, the middle position of the water cooling tube 2, the end of the water cooling tube 2 corresponding to the cathode electrode 5 of the discharge tube 3, at this time, the inner sleeve 6 can support the water cooling tube 2. It is preferred that the inner sleeve 6 is sleeved on the end of the water cooling tube 2 corresponding to the cathode electrode 5 of the discharge tube 3, thereby improving the supporting effect of the water cooling tube 2 corresponding to the cathode electrode 5 of the discharge tube 3, reducing the deviation of the water cooling tube 2 and the discharge tube 3 caused by the shaking of the laser tube, and reducing the output power reduction and output spot instability of the laser tube when it moves.

[0039] Among them, when the carbon dioxide laser tube is provided with a spiral tube 9 at the cathode electrode 5, the internal sleeve 6 can be located on the side of the spiral tube 9 close to the anode electrode 4, and the distance from the spiral tube 9 is 5cm-10cm. At this distance, the internal sleeve 6 can still be regarded as being sleeved on one end of the water-cooling tube 2 corresponding to the cathode electrode 5 of the discharge tube 3.

[0040] The support tube 7 may be any component that can be disposed between the outer sleeve 8 and the inner sleeve 6 and supports the gap between the outer sleeve 8 and the inner sleeve 6 .

[0041] In one or more embodiments, Figure 2 to Figure 3 As shown, the support tube 7 includes a tube body and at least three legs 72, all of which are connected to the tube body; the tube body is sleeved and abuts against the outer surface of the inner sleeve 6, and the free ends of all the legs 72 abut against the inner surface of the outer sleeve 8. It has a simple structure, low cost, and is more suitable for the operation mechanism of the carbon dioxide laser tube.

[0042] Specifically, the three legs 72 of the support tube 7 can be one elastic leg and two fixed legs, and the blade length of the elastic leg is greater than that of the fixed legs. The support tube 7 under this structure can well offset the bending phenomenon of the water-cooling tube under the influence of gravity, improve the coaxiality of the discharge tube 3, the water-cooling tube 2, and the gas storage tube 1, and reduce the possibility of unstable laser tube beam and power reduction. In addition, when the laser tube is subjected to external impact, the support tube 7 can provide vertical support force to reduce the impact on the water-cooling tube 2.

[0043] In addition, compared with the four-corner support bracket, the design of three legs utilizes the stability principle of the triangle to improve the stability of the support tube 7. It also saves more space and is easier to cut during production, so that each leg can be longer, meeting the requirement of a larger radial distance between the water cooling pipe 2 and the gas storage pipe, and better offsetting the external impact force.

[0044] Since the blade length of the elastic leg is longer than that of the fixed leg, when only one leg 72 is an elastic leg, the length of the elastic leg can be relatively longer, thereby meeting the requirement of a larger radial distance between the water cooling pipe 2 and the gas storage pipe 1, and better offsetting external impact force.

[0045] In addition, the support tube 7 can also be an integrated carbon dioxide laser tube discharge tube support tube as mentioned in CN202333427U, or a support tube for a carbon dioxide laser tube as mentioned in CN206148791U.

[0046] Among them, Figure 2 to Figure 3 As shown, the body of the support tube 7 has a second slit 71 , and the body of the support tube 7 can be opened outward from the second slit 71 .

[0047] The number of the support tubes 7 may be 1, preferably at least 2. Figure 1 As shown, the plurality of support tubes 7 are spaced apart along the axial direction of the inner sleeve 6, thereby providing sufficient support force. Based on this preferred solution, two support tubes 7 are preferably sleeved near both ends of the inner sleeve 6, respectively.

[0048] The sliding between the outer sleeve 8, the support tube 7, the inner sleeve 6 and the water-cooling tube 2 is explained in detail: the friction force between the surfaces of the inner sleeve 6 and the water-cooling tube 2 abutting against each other is defined as the first friction force, the friction force between the support tube 7 and the inner sleeve 6 is defined as the second friction force, and the friction force between the outer sleeve 8 and the support tube 7 is defined as the third friction force.

[0049] It can be understood that if the gas storage pipe and the water-cooling pipe produce different expansion and contraction amounts, if the first friction force is much smaller than the second friction force and the third friction force, then only the inner sleeve slides axially relative to the water-cooling pipe; if the second friction force is much smaller than the first friction force and the third friction force, then only the support tube slides axially relative to the inner sleeve; if the third friction force is much smaller than the first friction force and the second friction force, then only the outer sleeve slides axially relative to the support tube; if the first friction force, the second friction force, and the third friction force are similar or equal in magnitude, then the outer sleeve 8, the support tube 7, the inner sleeve 6 and the water-cooling pipe 2 may slide synchronously.

[0050] In one or more embodiments, considering that the axial length of the support tube 7 is relatively short, when sliding occurs between the support tube 7 and other components, there is a possibility that the support tube 7 may be stuck between the inner sleeve 6 and the outer sleeve 8 due to the deflection of the support tube 7 itself. Therefore, it is preferred to reduce or even eliminate the possible deformation of the water-cooling tube 2 by axial sliding between the inner sleeve 6 and the water-cooling tube 2.

[0051] Specifically, by making the surfaces of the inner sleeve 6 and the water-cooling tube 2 abutting against each other smooth enough, an appropriate first friction coefficient can be formed between the surfaces of the inner sleeve 6 and the water-cooling tube 2 abutting against each other, so that the first friction force is smaller than the second friction force and the third friction force. Thus, when the gas storage tube 1 and the water-cooling tube 2 expand and contract in different amounts due to thermal expansion, the inner sleeve 6 and the water-cooling tube 2 will first slide axially, and the support tube 7 and other components will not slide easily, thereby reducing the possibility of the support tube 7 being stuck between the inner sleeve 6 and the outer sleeve 8.

[0052] On this basis, in order to reduce the possibility of the inner sleeve 6 getting stuck, it is preferred that the length of the inner sleeve 6 is greater than or equal to 2.5 times the diameter of the inner sleeve 6, specifically 3 times, wherein the diameter of the inner sleeve 6 is equal to or slightly smaller than the diameter of the water cooling tube 2.

[0053] In one or more embodiments, the connection relationship between the inner sleeve 6 and the water cooling tube 2 can be an interference fit, or a slit can be provided on the inner sleeve 6, so that the inner sleeve 6 can be clamped on the water cooling tube 2 by causing a certain elastic deformation of the inner sleeve 6 outward from the slit.

[0054] In order to reduce the friction between the inner sleeve 6 and the water cooling tube 2, a slit may be provided on the inner sleeve 6. Specifically, Figure 2 to Figure 3As shown, a first slit 61 may be provided on the body of the inner sleeve 6 along the axial direction, wherein the first slit 61 cuts open one side of the inner sleeve 6, so that the inner sleeve 6 can be opened outward from the first slit 61. Compared with the scheme of interference fit between the inner sleeve 6 and the water-cooling tube 2, in the scheme of providing a slit on the inner sleeve 6, the pressure exerted by the inner sleeve 6 on the water-cooling tube 2 is smaller, thereby reducing the friction between the inner sleeve 6 and the water-cooling tube 2, and further, when the gas storage tube 1 and the water-cooling tube 2 have different expansion and contraction amounts due to thermal expansion, the inner sleeve 6 and the water-cooling tube 2 preferentially generate axial sliding.

[0055] Based on the above embodiment, the inner sleeve 6 can be a metal tube whose inner wall is smooth, so that an appropriate first friction coefficient is formed between the surfaces of the inner sleeve 6 and the water-cooling tube 2 that abut against each other; at the same time, the wall thickness of the metal tube is relatively thin, so that the metal tube can produce a certain elastic deformation from the cut to the outside.

[0056] In one or more embodiments, the cooperation between the support tube 7 and the inner sleeve 6 is preferably as follows: Figure 2 to Figure 3 As shown, when the support tube 7 is sleeved outside the inner sleeve 6, the first slit 61 and the second slit 71 are aligned, so that the support tube 7 and the inner sleeve 6 can be opened synchronously from the first slit 61 and the second slit 71, reducing the resistance force generated by the support tube 7 on the opening of the inner sleeve 6, and facilitating the sliding of the inner sleeve 6 on the water-cooling tube 2.

[0057] In one or more embodiments, the outer sleeve 8 can be a glass tube, and a glass column 81 is provided between the outer sleeve 8 and the gas storage tube 1. The two ends of the glass column 81 are respectively connected to the outer sleeve 8 and the gas storage tube 1 through integral casting, thereby realizing the connection between the outer sleeve 8 and the gas storage tube 1.

[0058] The number of the glass columns 81 is preferably multiple, and the multiple glass columns 81 are arranged on the same circumferential surface of the outer sleeve 8. That is, at least two glass columns 81 are arranged on a cross section (circumferential surface) of the outer sleeve 8. All the glass columns 81 are evenly spaced along the same circumferential surface of the outer sleeve 8, so as to improve the stability and reliability of the support, and to maximize the coaxiality of the outer sleeve 8 when the gas storage pipe 1 is heated and expanded and elongated.

[0059] Example 2

[0060] A processing method is provided for processing a carbon dioxide laser tube as described in any one of Embodiment 1, comprising the steps of:

[0061] First, the inner sleeve 6 , the support tube 7 and the outer sleeve 8 are sleeved on the water-cooling tube 2 , and then the outer sleeve 8 is cast and connected to the gas storage tube 1 .

[0062] Among them, the inner sleeve 6, the support tube 7 and the outer sleeve 8 may have processing errors. At the same time, when the inner sleeve 6, the support tube 7 and the outer sleeve 8 are sleeved on the water-cooling tube 2, positional deviation may occur. For example, when the inner sleeve 6 opens outward from the first slit 61, or when the barrel of the support tube 7 opens outward from the second slit 71, the cross section of the inner sleeve 6 or the support tube 7 will change from a circular shape to a shape that is approximately circular. Therefore, by first sleeved on the water-cooling tube 2, the inner sleeve 6, the support tube 7 and the outer sleeve 8, and then casting and connecting the outer sleeve 8 to the gas storage tube 1, the position of the outer sleeve 8 cast on the gas storage tube 1 can be adjusted to adapt to the above-mentioned processing errors or positional deviations, ensuring that the inner sleeve 6, the support tube 7 and the outer sleeve 8 can provide a stable support effect, improve processing accuracy, and enhance the coaxiality of the gas storage tube 1 and the water-cooling tube 2.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A carbon dioxide laser tube, comprising a gas storage tube (1), a water cooling tube (2) and a discharge tube (3) which are sequentially arranged from the outside to the inside, characterized in that: It also comprises an outer sleeve (8), a support sleeve (7) and an inner sleeve (6); the outer sleeve (8), the support sleeve (7), the inner sleeve (6) and the water cooling tube (2) are sequentially sleeved and abutted from the outside to the inside; the outer sleeve (8) is connected to the gas storage tube (1); Wherein, the inner sleeve (6) can slide axially relative to the water-cooling tube (2); and / or the support tube (7) can slide axially relative to the inner sleeve (6); and / or the outer sleeve (8) can slide axially relative to the support tube (7).

2. A carbon dioxide laser tube according to claim 1, characterized in that: The friction force between the surfaces of the inner sleeve (6) and the water-cooling tube (2) abutting against each other is defined as a first friction force, the friction force between the support tube (7) and the inner sleeve (6) is defined as a second friction force, and the friction force between the outer sleeve (8) and the support tube (7) is defined as a third friction force; There is a first friction coefficient between the surfaces of the inner sleeve (6) and the water-cooling tube (2) that abut against each other, 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. The carbon dioxide laser tube according to claim 1, characterized in that: The body of the inner sleeve (6) has a first slit (61), and the inner sleeve (6) can be expanded outwards from the first slit (61).

5. A carbon dioxide laser tube according to claim 4, characterized in that: The body of the support tube (7) has a second slit (71), and the body of the support tube (7) can be opened outward from the second slit (71); When the support tube (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 one of claims 1 to 5, characterized in that: The support cylinder (7) comprises a cylinder body and at least three legs (72), all of which are connected to the cylinder body; the cylinder body is sleeved on and abuts against the inner sleeve (6), and the free ends of all of the legs (72) abut against the outer sleeve (8) outwardly.

7. A carbon dioxide laser tube according to any one of claims 1 to 5, characterized in that: The number of the support tubes (7) is at least 2, and the plurality of support tubes (7) are distributed at intervals along the axial direction of the inner sleeve (6).

8. A carbon dioxide laser tube according to any one of claims 1 to 5, characterized in that: The inner sleeve (6) is sleeved on one end of the water cooling tube (2) corresponding to the cathode electrode (5) of the discharge tube (3).

9. A carbon dioxide laser tube according to any one of claims 1 to 5, characterized in that: The inner sleeve is a metal tube.

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

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