Combustion chamber endoscope fixing device and hydrogen gas turbine

Abstract

The combustion chamber endoscope fixing device comprises a first sleeve and a second sleeve arranged in the first sleeve in a sleeved mode, and the other end of the second sleeve is inserted into a combustion chamber; one end of the endoscope penetrates through the first sleeve, and the other end of the endoscope is arranged in an internal space formed by the second sleeve; an air inlet channel is formed among the endoscope, the first sleeve and the second sleeve; the first sleeve and the second sleeve are respectively provided with a first exhaust channel and a second exhaust channel in the direction parallel to the axial direction of the endoscope, a gap between the first sleeve and the second sleeve forms a third exhaust channel, and the first exhaust channel, the third exhaust channel and the second exhaust channel are communicated through flow channels; the cooling medium flows along the air inlet channel, turns back at the position close to the end of the endoscope to enter the second exhaust channel, and sequentially flows through the third exhaust channel and the first exhaust channel to be exhausted. The fixing device is compact in structure, cooling, locking and fixing of the endoscope are achieved, the problem that a traditional endoscope is poor in temperature resistance is solved, and cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of gas turbines, and in particular to a combustion chamber inner endoscope fixing device. Background Art

[0002] Under the background of carbon neutrality, hydrogen energy has become an important component of terminal energy consumption, and hydrogen energy application technology represented by hydrogen gas turbines has become an important development direction for major countries in the world. The combustion properties of hydrogen and natural gas are very different. The laminar flame speed of hydrogen is 10 times that of methane, the upper and lower limits of the flammable limit are 5 times that of methane, the auto-ignition temperature is 35°C lower than that of methane, and the minimum ignition energy is only 6% of that of methane. Due to the active chemical properties of hydrogen, flashback is more likely to occur during the combustion process, which poses a great challenge to the safety control of pure hydrogen gas turbines.

[0003] To solve this problem, an endoscope is installed in the combustion chamber of the hydrogen gas turbine to observe the internal flame. On-site technicians can determine whether flashback occurs by the change in the flame image, and shut down the machine when flashback or hardware damage occurs, thereby improving the safety of gas turbine operation. However, the commonly used endoscopes generally have a temperature resistance of only about 70°C, which is far lower than the temperature resistance requirements inside the combustion chamber. If a high-temperature resistant endoscope is used, the equipment cost will be high.

[0004] Patent CN117872582A discloses a cooling channel of an endoscope, which adopts a nested cooling device, including an inner protective sleeve, an air-cooled protective sleeve, a water-cooled protective sleeve, a water inlet joint, a water outlet joint, an air inlet joint, a flange, and an outer protective cover. The endoscope is cooled by using a dual cooling system of liquid cooling and air-cooled film cooling. The cooling channel proposed in the patent adopts water cooling and air cooling, and has a complex structure. The nested structure increases the volume of the endoscope and is not suitable for gas turbines.

[0005] Patent US8246298B2 discloses a cooling channel extending from the side, which enters the borescope through a boss to cool the endoscope. The cooling and fixing device disclosed in the patent is relatively complex and occupies a large volume.

[0006] The design of the endoscope fixture based on hydrogen gas turbines is more difficult. On the one hand, the combustion chamber opening cannot be too large. If the diameter of the observation tube is too large, it will hinder the flow of gas between the guide bushing and the flame tube, which will have an adverse effect on the cooling of the hardware and the uniformity of combustion. The existing gas-cooled endoscope observation tube has a relatively large diameter due to the flow requirements and cannot meet the size restrictions on the combustion chamber opening of a hydrogen gas turbine. On the other hand, it is difficult to introduce cooling water into hydrogen gas turbines, and gas cooling requires sufficient flow, resulting in the internal flow area of ​​the observation tube cannot be too small.

[0007] In view of the above technical problems, the present invention is specially introduced. Summary of the invention

[0008] The main purpose of the present invention is to provide a combustion chamber endoscope fixing device and a hydrogen gas turbine using the fixing device, which realizes the cooling and locking fixation of the endoscope in a limited space, solves the problem of poor temperature resistance of traditional endoscopes, and reduces costs.

[0009] In order to achieve the above-mentioned objectives, the present invention provides a combustion chamber endoscope fixing device for fixing an endoscope in a combustion chamber and cooling the endoscope, comprising a first sleeve and a second sleeve, wherein one end of the second sleeve is sleeved inside the first sleeve, and the other end of the second sleeve is inserted into the combustion chamber; one end of the endoscope is inserted into the first sleeve, and the other end of the endoscope is arranged in the internal space formed by the second sleeve; an air intake channel is formed between the endoscope and the first sleeve and the second sleeve; the first sleeve and the second sleeve are respectively provided with a first exhaust channel and a second exhaust channel in a direction parallel to the axial direction of the endoscope, and a third exhaust channel is formed in the gap between the first sleeve and the second sleeve, and the first exhaust channel, the third exhaust channel and the second exhaust channel are connected; the cooling medium flows along the air intake channel, and returns to enter the second exhaust channel near the end of the endoscope, and flows through the third exhaust channel and the first exhaust channel in sequence to be discharged.

[0010] Preferably, it also includes a clamping nut, which is sleeved inside the second sleeve, and a fourth exhaust channel is formed between at least a portion of the clamping nut and the second sleeve, and the fourth exhaust channel is in airflow communication with the second exhaust channel.

[0011] Preferably, the clamping nut is provided with an air flow groove running through it in the circumference, and the cooling medium enters the fourth exhaust channel through the air flow groove.

[0012] Preferably, a plurality of first exhaust channels and a plurality of second exhaust channels are provided in the circumference of the first sleeve and the second sleeve.

[0013] Preferably, in the cross section of the first sleeve, the plurality of first exhaust passages are distributed in the upper middle portion of the first sleeve.

[0014] Preferably, the third exhaust passage is an annular exhaust passage.

[0015] Preferably, the endoscope comprises a guide wire and an endoscope body, and the guide wire is arranged in a direction away from the combustion chamber.

[0016] Preferably, the first sleeve is provided with an air inlet near the wire end.

[0017] Preferably, the first exhaust passage extends to an end of the first sleeve away from the combustion chamber.

[0018] Preferably, it also includes an observation window and a spacer block, wherein the spacer block is arranged between the observation window and the clamping nut.

[0019] Preferably, it also includes a locking nut and a ferrule, the ferrule is sleeved on the outside of the wire, and the ferrule abuts against the first sleeve and the locking nut.

[0020] Preferably, the locking nut is threadedly connected to the outer surface of one end of the first sleeve.

[0021] Preferably, a positioning block is further included, and the positioning block is located between the endoscope body and the first sleeve and / or the second sleeve.

[0022] Preferably, the second sleeve is further provided with a flange through hole, and the second sleeve is fixed to the combustion chamber through the flange through hole.

[0023] Preferably, the locking nut is axially provided with a plurality of fifth exhaust passages.

[0024] On the other hand, the present application also proposes a hydrogen gas turbine, which is characterized in that it includes a combustion chamber and the above-mentioned endoscope fixing device, and the endoscope fixing device is inserted into the flame tube of the combustion chamber.

[0025] The combustion chamber internal mirror fixing device and hydrogen gas turbine proposed by the present invention achieve the following technical effects:

[0026] 1. By forming a cooling channel inside the fixture, the structure is compact, the volume is reduced, and the combustion chamber opening size limit is met, which is particularly suitable for hydrogen gas turbine combustion chambers;

[0027] 2. By optimizing the cooling passage, a narrow cooling circuit is formed, which greatly increases the length of the cooling flow path, improves the cooling effect, is suitable for ordinary endoscopes with lower temperature resistance, and reduces costs.

[0028] 3. By setting a larger air inlet channel, sufficient heat exchange between the endoscope and the cooling medium can be promoted; the cooling medium after heat exchange enters the first exhaust channel and the second exhaust channel with smaller diameters to accelerate, quickly take away the heat, and improve the heat exchange efficiency.

[0029] 4. By setting the air flow groove, a high-pressure area is formed locally, and the cooling medium after heat exchange is quickly sprayed into the fourth exhaust channel to improve the heat exchange efficiency.

[0030] 5. The airflow seal between the first sleeve and the endoscope is achieved by setting the ferrule structure, which prevents the cooling medium from being discharged from the left side of the first sleeve and flows to the right, thereby forming an effective cooling flow.

[0031] 6. The fixing device structure is simple to assemble and disassemble, has strong fixing stability, and is convenient for replacing the endoscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0033] Figure 1 A schematic diagram of the structure of an endoscope is shown;

[0034] Figure 2 A schematic diagram of the assembly of a fixing device including a first sleeve and a second sleeve in application embodiment 1 is shown;

[0035] Figure 3 A schematic cross-sectional view of a compression nut is shown;

[0036] Figure 4 A schematic side view of a compression nut is shown;

[0037] Figure 5 A schematic diagram of the observation window structure is shown;

[0038] Figure 6 A schematic diagram of the cushion block structure is shown;

[0039] Figure 7 A schematic cross-sectional view of the first sleeve in application embodiment 1 is shown;

[0040] Figure 8 A schematic cross-sectional view of the second sleeve in application embodiment 1 is shown;

[0041] Fig. 9 A schematic cross-sectional view of the first sleeve in Embodiment 2 of the present application is shown;

[0042] Fig.10 A schematic cross-sectional view of a locking nut in Embodiment 2 of the present application is shown;

[0043] Fig.11 A side view of the locking nut in Embodiment 2 of the present application is shown;

[0044] Fig.12 A top view of the ferrule in Example 2 of the present application is shown;

[0045] Fig.13 A side view of the ferrule in Example 2 of the present application is shown;

[0046] Fig.14 A cross-sectional view of the ferrule in Example 2 of the present application is shown

[0047] Fig.15 A schematic diagram of the positioning block structure in Example 2 of the present application is shown;

[0048] Fig.16 A schematic diagram of the assembly of a fixing device including a locking nut, a ferrule and a first sleeve in Example 2 of the present application is shown.

[0049] The above drawings include the following reference numerals:

[0050] 100, first sleeve; 200, second sleeve; 600, endoscope; 160, air inlet channel; 110, first exhaust channel; 120, third exhaust channel; 220, second exhaust channel; 300, clamping nut; 320, fourth exhaust channel; 310, air flow groove; 610, wire; 620, endoscope body; 140, air inlet; 500, observation window; 400, gasket; 700, locking nut; 800, ferrule; 900, positioning block; 240, flange through hole; 720, fifth exhaust channel; 180, exhaust port; 190, cannula; 250, inner wall; 270, observation hole; 170, inclined hole; 730, through hole; 820, semi-conical structure; 840, semi-cylindrical structure; 860, semi-circular groove. DETAILED DESCRIPTION

[0051] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] The present invention is further described in detail below in conjunction with specific embodiments, and these embodiments cannot be understood as limiting the scope of protection claimed by the present invention. The term "including" when used indicates the existence of a feature, but does not exclude the existence or addition of one or more other features; the orientation or position relationship indicated by the terms "lateral", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention; in addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0053] In the description, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0054] Embodiment 1:

[0055] The present application proposes a combustion chamber endoscope fixing device, which is used to fix the endoscope 600 in the combustion chamber and cool the endoscope 600. The fixing device proposed in the present application forms a cooling channel inside the fixing device on the premise of ensuring the stability of the fixation of the endoscope, and has a compact structure, reduced volume, and meets the combustion chamber opening restriction requirements; by optimizing the cooling passage, a narrow and long cooling circuit is formed, which greatly increases the length of the cooling flow path, improves the cooling effect, is suitable for ordinary endoscopes with lower temperature resistance, and reduces costs.

[0056] like Figure 1 As shown, the endoscope 600 includes a wire 610 and an endoscope body 620, and the wire 610 is arranged in a direction away from the combustion chamber. Among them, the temperature resistance of the wire part is poor, and the maximum temperature that can withstand is 70°C, so it is necessary to strengthen the heat exchange in the wire area. The endoscope body 620 includes a photosensitive electronic component and an observation lens.

[0057] Specifically, if Figure 2 As shown, it includes a first sleeve 100 and a second sleeve 200, one end of the second sleeve 200 is sleeved inside the first sleeve 100, and the other end of the second sleeve 200 is inserted into the combustion chamber; one end of the endoscope 600 is inserted into the first sleeve 100, and the other end of the endoscope 600 is arranged in the internal space formed by the second sleeve 200. An air intake channel 160 is formed between the endoscope 600, the first sleeve 100 and the second sleeve. The first sleeve 100 and the second sleeve 200 are respectively provided with a first exhaust channel 110 and a second exhaust channel 220 in a direction parallel to the axial direction of the endoscope 600, and the gap between the first sleeve 100 and the second sleeve 200 forms a third exhaust channel 120, and the first exhaust channel 110, the third exhaust channel 120 and the second exhaust channel 220 are connected. The cooling medium flows along the air intake channel 160, and returns to enter the second exhaust channel 220 near the end of the endoscope 600, and flows through the third exhaust channel 120 and the first exhaust channel 110 in sequence and is discharged. The cooling medium used in the present application is a gas cooling medium, such as air or nitrogen, which is not specifically limited here.

[0058] The cooling medium inlet 140 is located at the end of the first sleeve 100 close to the wire 610, which improves the heat exchange effect of the wire area, greatly reduces the temperature of this area, and avoids wire damage. The first exhaust channel 110 extends to the end of the first sleeve 100 away from the combustion chamber, that is, the end forms an exhaust port.

[0059] The present application adopts a baffle cooling passage to form a long path cooling passage in the axial direction of the endoscope, thereby improving the cooling effect. In order to further improve the cooling efficiency, the diameter of the air intake passage 160 in the present application is larger than the diameters of the first exhaust passage 110 and the second exhaust passage 220. By setting a larger air intake passage, sufficient heat exchange between the endoscope wire area and the cooling medium can be promoted; the cooling medium after heat exchange enters the first exhaust passage 110 and the second exhaust passage 220 to accelerate, quickly take away the heat, and improve the heat exchange efficiency.

[0060] In order to guide the cooling medium into the exhaust passage, the present application introduces a compression nut 300 in the fixing device, and combines the attached Figure 2 and attached Figure 3 As shown, the clamping nut 300 is sleeved inside the second sleeve 200, and a fourth exhaust channel 320 is formed between at least part of the clamping nut 300 and the second sleeve 200, and the fourth exhaust channel 320 is in airflow communication with the second exhaust channel 220. In addition, the clamping nut 300 is provided with a penetrating airflow groove 310 in the circumferential direction, and the cooling medium enters the fourth exhaust channel 320 through the airflow groove 310. By providing the airflow groove 310, a high-pressure area is formed locally, and the cooling medium after heat exchange is quickly sprayed into the fourth exhaust channel 320, and then enters the second exhaust channel 220, thereby improving the heat exchange efficiency. Preferably, the clamping nut 300 is connected to the inner wall of the second sleeve 200 by threads.

[0061] In order to improve the heat exchange effect, the first sleeve 100 and the second sleeve 200 are provided with a plurality of first exhaust channels 110 and a plurality of second exhaust channels 220 in the circumferential direction of the present application. Figure 4 As shown, on the cross section of the first sleeve 100, a plurality of first exhaust channels 110 are distributed in the middle and upper part of the first sleeve 100. The position of the middle and upper part is not specifically limited here, as long as it is higher than the intake channel of the cooling medium. In this way, the cooling medium enters from the bottom and flows out from the exhaust channel near the middle and upper part, further improving the heat exchange efficiency.

[0062] In the present application, the third exhaust channel 120 is formed by the first sleeve 100 and the second sleeve 200 to form an annular exhaust channel. When the cooling medium flows through the annular exhaust channel, heat is further exchanged with the endoscope guide wire area. The annular exhaust channel makes the temperature distribution in this area more uniform, avoiding local high temperature.

[0063] In addition, combined with Figure 2 and attached Figure 5 , 6As shown, the fixing device proposed in the present application also includes an observation window 500 and a spacer 400. The observation window 500 is cylindrical and made of transparent materials such as quartz glass and sapphire glass. The spacer 400 is arranged between the observation window 500 and the clamping nut 300, and is also arranged between the observation window 500 and the second sleeve 200. The preferred spacer 400 is annular and can be made of materials such as flexible graphite, hard graphite, copper, and high-temperature alloys. The clamping nut 300 and the spacer 400 realize the fixation of the position of the observation window 500.

[0064] The present application also proposes a hydrogen gas turbine, comprising a combustion chamber and an endoscope fixing device, wherein the endoscope fixing device is inserted into the flame tube of the combustion chamber. There is a flame inside the flame tube, and the temperature is extremely high. By adopting the fixing device with the above cooling structure, the endoscope area is cooled; the fixing device has a compact structure and can meet the opening restriction requirements of the hydrogen gas turbine.

[0065] The following specifically describes the connection relationship and structural details between the various components of the fixing device, and describes the installation steps of the fixing device.

[0066] Attached Figure 7 The first sleeve includes an air inlet 140 and a plurality of exhaust ports 180, which are distributed along the circumference to leave the circumferential position of the air inlet 140. The first sleeve is connected to the second sleeve at a threaded position, and the first sleeve is also provided with an insert 190, which is inserted into the second sleeve.

[0067] As attached Figure 8 As shown, the second sleeve is provided with a flange through hole 240, and the second sleeve 200 is fixed to the combustion chamber through the flange through hole 240. The second sleeve is provided with an external thread, which is connected with the internal thread of the first sleeve. In addition, the inner wall 250 of the end area of ​​the second sleeve is provided with an internal thread for installing a compression nut. The second sleeve is provided with a plurality of second exhaust channels 220 distributed along the circumference. A bottom observation hole 270 is provided at the end of the second sleeve.

[0068] As attached Figure 3 As shown, the clamping nut is provided with an external thread, which cooperates with the internal thread of the second sleeve. The clamping nut is provided with a plurality of air flow grooves 310 in the circumferential direction. The end of the clamping nut is provided with a plurality of oblique grooves along the circumference, which facilitates the insertion of tools such as screwdrivers for disassembly and assembly.

[0069] During installation, prepare two gaskets 400, put the gaskets 400 and the observation window 500 into the second sleeve 200 in turn, then screw in the clamping nut 300, clamp the gaskets 400 and the observation window 500, and finally install the first sleeve 100 on the second sleeve 200, and insert the cannula 190 into the second sleeve.

[0070] During operation, cooling air, nitrogen or the like enters from the air inlet 140 and flows to the right along the gap between the first sleeve and the endoscope. Computational fluid dynamics simulation shows that the cooling medium flows around the endoscope in the first sleeve, cooling the area where the endoscope is located to a tolerable temperature. Afterwards, the airflow passes through the airflow groove 310 and the second exhaust channel 220, flows to the left along the gap between the first sleeve and the second sleeve, and is discharged from the exhaust port 180.

[0071] Embodiment 2:

[0072] The solution of this embodiment is basically the same as that of Embodiment 1, except that in Embodiment 2, the contact portion between the endoscope and the first sleeve 100 is optimized to prevent the cooling medium from escaping from the connection gap between the first sleeve and the endoscope.

[0073] Specifically, a locking nut 700 and a ferrule 800 are added to the fixing device, and the locking nut 700 is threadedly connected to the outer surface of one end of the first sleeve 100. The ferrule 800 is sleeved on the outside of the wire 610, and the ferrule 800 is against the first sleeve 100 and the locking nut 700. A seal is formed between the ferrule and the first sleeve, which prevents the cooling medium from being discharged from the left side of the first sleeve, but flows to the right to form an effective cooling flow. In addition, the locking nut 700 is axially provided with a plurality of fifth exhaust channels 720, and the cooling medium flowing through the first exhaust channel is discharged from the fifth exhaust channel 720.

[0074] The fixing device further includes a positioning block 900 , which is located between the endoscope body 620 and the first sleeve 100 and / or the second sleeve 200 .

[0075] The following specifically describes the connection relationship and structural details of the locking nut 700 and other fixing devices such as the ferrule 800, and describes the installation steps.

[0076] like Fig. 9 As shown, the first sleeve 100 is provided with an oblique hole 170 for inserting the ferrule 800. The first sleeve 100 is provided with an external thread for matching and connecting with the locking nut 700.

[0077] like Fig.10 , 11 As shown, the locking nut 700 is provided with an internal thread for matching with the external thread of the first sleeve. The locking nut 700 is provided with a fifth exhaust channel 720 for exhausting the cooling medium. The locking nut 700 is provided with a through hole 730 for inserting the ferrule 800.

[0078] Combination Figure 12-14As shown, the ferrule 800 is a semi-rotating body, and the two semi-rotating bodies are symmetrically spliced. A semicircular groove 860 is provided inside the rotating body, which is spliced ​​to form a cylindrical groove to clamp the endoscope wire. The ferrule 800 is provided with a semi-truncated cone structure 820, which is respectively pressed against the inner wall of the locking nut and the inclined hole 170. The ferrule is also provided with a semi-cylindrical structure 840, and the semi-cylindrical structure 840 is inserted into the inclined hole 170. The size and splicing gap of the ferrule can be adjusted according to actual conditions to meet the fixing and sealing requirements. Preferably, the ferrule is made of materials with high temperature resistance and low thermal conductivity such as bakelite and mica to avoid high temperature heating and damage to the endoscope through heat conduction.

[0079] In addition, the fixing device also includes Fig.15 The positioning block 900 shown is used to fix the endoscope near the body in the first sleeve or the second sleeve. The positioning block structure is a cylinder with a chamfered angle, and the height of the positioning block can be adjusted to meet the endoscope fixation requirements. The positioning block is made of bakelite, mica and other materials with high temperature resistance and low thermal conductivity to avoid high temperature heating and damage to the endoscope through heat conduction.

[0080] like Fig.16 As shown, during installation, multiple positioning blocks are pre-fixed on the first sleeve, and the positioning blocks are arranged along the circumferential direction; insert the endoscope into the locking nut through hole. Then, the two positioning blocks are assembled on both sides of the endoscope and aligned. When assembling, it is necessary to ensure that the clamping position of the endoscope is appropriate. Then move the locking nut to the right, and the ferrule enters the locking nut. Finally, hold the locking nut, straighten the endoscope, insert the first sleeve from the right side of the endoscope, insert the endoscope body into the gap between the positioning blocks, and tighten the locking nut and the first sleeve at the same time. The wire is clamped by the sleeve and cannot move, so it is fixed.

[0081] In summary, the combustion chamber internal mirror fixing device and hydrogen gas turbine proposed in this embodiment achieve the following technical effects:

[0082] 1. By forming a cooling channel inside the fixture, the structure is compact, the volume is reduced, and the combustion chamber opening size limit is met, which is particularly suitable for hydrogen gas turbine combustion chambers;

[0083] 2. By optimizing the cooling passage, a narrow cooling circuit is formed, which greatly increases the length of the cooling flow path, improves the cooling effect, is suitable for ordinary endoscopes with lower temperature resistance, and reduces costs.

[0084] 3. By setting a larger air inlet channel, sufficient heat exchange between the endoscope and the cooling medium can be promoted; the cooling medium after heat exchange enters the first exhaust channel and the second exhaust channel with smaller diameters to accelerate, quickly take away the heat, and improve the heat exchange efficiency.

[0085] 4. By setting the air flow groove, a high-pressure area is formed locally, and the cooling medium after heat exchange is quickly sprayed into the fourth exhaust channel to improve the heat exchange efficiency.

[0086] 5. The airflow seal between the first sleeve and the endoscope is achieved by setting the ferrule structure, which prevents the cooling medium from being discharged from the left side of the first sleeve and flows to the right, thereby forming an effective cooling flow.

[0087] 6. The fixing device structure is simple to assemble and disassemble, has strong fixing stability, and is convenient for replacing the endoscope.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A combustion chamber endoscope fixing device, used for fixing an endoscope (600) in the combustion chamber and cooling the endoscope (600), characterized in that: The invention comprises a first sleeve (100) and a second sleeve (200), wherein one end of the second sleeve (200) is sleeved inside the first sleeve (100), and the other end of the second sleeve (200) is inserted into the combustion chamber; one end of the endoscope (600) is inserted into the first sleeve (100), and the other end of the endoscope (600) is arranged in the internal space formed by the second sleeve (200); An air intake passage (160) is formed between the endoscope (600), the first sleeve (100) and the second sleeve; The first sleeve (100) and the second sleeve (200) are respectively provided with a first exhaust channel (110) and a second exhaust channel (220) in a direction parallel to the axial direction of the endoscope (600); a gap between the first sleeve (100) and the second sleeve (200) forms a third exhaust channel (120); and the first exhaust channel (110), the third exhaust channel (120) and the second exhaust channel (220) are in fluid communication; The cooling medium flows along the air inlet channel (160), turns back near the end of the endoscope (600) to enter the second exhaust channel (220), and flows through the third exhaust channel (120) and the first exhaust channel (110) in sequence to be discharged.

2. The combustion chamber inner endoscope fixing device according to claim 1, characterized in that: The invention also includes a clamping nut (300), wherein the clamping nut (300) is sleeved inside the second sleeve (200), and a fourth exhaust channel (320) is formed between at least a portion of the clamping nut (300) and the second sleeve (200), and the fourth exhaust channel (320) is connected to the second exhaust channel (220) in terms of airflow.

3. The combustion chamber inner endoscope fixing device according to claim 2, characterized in that: The compression nut (300) is provided with a penetrating airflow groove (310) in the circumferential direction, and the cooling medium enters the fourth exhaust channel (320) through the airflow groove (310).

4. The combustion chamber inner endoscope fixing device according to any one of claims 1 to 3, characterized in that: The diameter of the intake passage (160) is greater than the diameters of the first exhaust passage (110) and the second exhaust passage (220).

5. The combustion chamber inner endoscope fixing device according to any one of claims 1 to 3, characterized in that: A plurality of the first exhaust channels (110) and a plurality of the second exhaust channels (220) are provided in the circumferential direction of the first sleeve (100) and the second sleeve (200).

6. The combustion chamber inner endoscope fixing device according to claim 5, characterized in that: In a cross section of the first sleeve (100), the plurality of first exhaust passages (110) are distributed in an upper middle portion of the first sleeve (100).

7. The combustion chamber inner endoscope fixing device according to any one of claims 1 to 3, characterized in that: The third exhaust passage (120) is an annular exhaust passage.

8. The combustion chamber inner endoscope fixing device according to any one of claims 1 to 3, characterized in that: The endoscope (600) includes a guide wire (610) and an endoscope body (620), wherein the guide wire (610) is arranged in a direction away from the combustion chamber.

9. The combustion chamber inner endoscope fixing device according to claim 8, characterized in that: The first sleeve (100) is provided with an air inlet (140) at an end close to the wire (610).

10. The combustion chamber inner endoscope fixing device according to any one of claims 1 to 3, characterized in that: The first exhaust passage (110) extends to an end of the first sleeve (100) away from the combustion chamber.

11. The combustion chamber inner endoscope fixing device according to claim 2 or 3, characterized in that: It also includes an observation window (500) and a cushion block (400), wherein the cushion block (400) is arranged between the observation window (500) and the clamping nut (300).

12. The combustion chamber inner endoscope fixing device according to claim 8, characterized in that: It also includes a locking nut (700) and a ferrule (800), wherein the ferrule (800) is sleeved on the outside of the wire (610), and the ferrule (800) abuts against the first sleeve (100) and the locking nut (700).

13. The combustion chamber inner endoscope fixing device according to claim 12, characterized in that: The locking nut (700) is threadedly connected to the outer surface of one end of the first sleeve (100).

14. The combustion chamber inner endoscope fixing device according to claim 8, characterized in that: It also includes a positioning block (900), and the positioning block (900) is located between the endoscope body (620) and the first sleeve (100) and / or the second sleeve (200).

15. The combustion chamber inner endoscope fixing device according to any one of claims 1 to 3, characterized in that: The second sleeve (200) is also provided with a flange through hole (240), and the second sleeve (200) is fixed to the combustion chamber through the flange through hole (240).

16. The combustion chamber inner endoscope fixing device according to claim 13, characterized in that: The locking nut (700) is axially provided with a plurality of fifth exhaust passages (720).

17. A hydrogen gas turbine, characterized in that: It comprises a combustion chamber and the endoscope fixing device according to any one of claims 1 to 16, wherein the endoscope fixing device is inserted into the flame tube of the combustion chamber.

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