Supplementary welding inner cooling protector for nozzle ring of turbojet engine

Abstract

The application relates to a welding technology field, in particular to a turbojet engine nozzle ring repair welding inner cooling protector, which comprises an inner cooling system matched with a ring-shaped base and a supporting arm of a nozzle ring; the inner cooling system comprises an arc-shaped block and an arc-shaped pad; the arc-shaped block and the arc-shaped pad are supported by an elastic supporting mechanism and are supported apart from both ends of the ring-shaped base, so as to form an elastic fixing structure; the height of the arc-shaped block is set as being less than the height of the matched ring-shaped base, the difference is greater than 1mm and less than 5mm; longitudinal groove arrays and annular groove arrays are formed on the outer wall of the arc-shaped block. By arranging the arc-shaped block in the matched ring-shaped base, the continuously flowing protective gas uniformly flows through the arc-shaped block, the ring-shaped base and the supporting arm, and the protective gas is discharged from the left and right ends of the arc-shaped block and then flows through the welding repair position, so that the welding repair position is continuously and locally cooled.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, and in particular to an internal cooling protection device for repair welding of the nozzle ring of a turbojet engine. Background Technology

[0002] A turbojet engine is a thermal engine that relies on high-speed gas flow to generate thrust. As one of its core components, the nozzle ring has a significant impact on the engine's performance and reliability.

[0003] A nozzle ring typically includes an annular base and a nozzle ring. The upper end of the annular base has a flared structure with a cross-sectional area that gradually increases from bottom to top. The inner wall of the flared structure is connected to the lower part of the nozzle ring through a support arm arranged around it. The support arm has a gas channel inside. The gas channel forms an air inlet on the outer wall of the flared structure and an air outlet on the upper wall of the nozzle ring.

[0004] The annular base serves as the connection and positioning foundation for the nozzle ring. During assembly, it is used to dock and fix with other engine components. In operation, the annular base not only needs to withstand the thermal shock of high-temperature and high-pressure combustion gases, but also needs to withstand large assembly preload and aerodynamic loads during operation. Therefore, it is required to have sufficient structural strength, good sealing performance, and uniform wall thickness distribution to avoid local stress concentration caused by uneven thermal expansion and contraction, thereby ensuring the structural stability and sealing reliability of the entire nozzle ring.

[0005] However, after the ring base is cast, due to the limitations of the casting process, casting defects such as porosity and shrinkage are inevitable on its inner wall surface. These defects will seriously weaken the structural strength and sealing performance of the ring base, so welding repair is required.

[0006] However, since the annular base is a thin-walled casting, the welding repair process can cause significant thermal and structural stress in the repair area. After welding, warping, microcracks, or even through-cracks can easily occur in the repair area and its surroundings, directly leading to product scrap. Utility Model Content

[0007] The purpose of this invention is to provide a welded internal cooling protector for the nozzle ring of a turbojet engine, in order to solve at least one of the above-mentioned technical problems.

[0008] The technical problem solved by this utility model can be achieved by the following technical solution:

[0009] An internal cooling protector for repairing the nozzle ring of a turbojet engine includes an internal cooling system that matches the annular base and support arm of the nozzle ring. The internal cooling system includes an arc-shaped block and an arc-shaped pad. The arc-shaped block and the arc-shaped pad are connected by an elastic support mechanism, extending outwards from both ends inside the annular base to form an elastically fixed structure. The height of the arc-shaped block is set to be less than the height of the adapted annular base, with a difference greater than 1 mm and less than 5 mm. The outer wall of the arc-shaped block has a longitudinal groove array and a circumferential groove array. The longitudinal groove array includes at least two longitudinal grooves. The circumferential groove array includes at least two circumferential grooves. The longitudinal grooves and circumferential grooves communicate at their intersection. An air source connection is provided on the inner wall of the arc-shaped block. The air source connector is connected to the intersection of the longitudinal and circumferential grooves on the outer wall of the arc-shaped block via a channel. Thus, the air source connector is connected to both the longitudinal and circumferential groove arrays on the arc-shaped block. The outer wall of the arc-shaped block has an expanding section above the middle, with a gradually increasing radius from bottom to top, adapting to the varying curvature of the outer wall of the adapted annular base. The arc length of the expanding section covers at least four support arms circumferentially above the adapted nozzle, and the expanding section forms a recess outside the support arms that fits against the root of the support arms. At least three of the longitudinal grooves and at least five of the circumferential grooves pass through the recess. The circumferential grooves extend through both ends of the arc-shaped block along its arc length.

[0010] In the above design, the elastic support mechanism reliably presses the arc-shaped block and arc-shaped pad against the inner side of the annular base. Shielding gas is introduced through the gas source connector into the longitudinal and circumferential groove arrays via channels. After flowing along the longitudinal and circumferential groove arrays, the shielding gas is discharged from the left and right ends of the arc-shaped block. The continuously flowing shielding gas evenly covers the inner wall surface of the adapted annular base and the outer wall surface of the support arm root, allowing for sufficient heat exchange with these surfaces and carrying away the heat generated during welding. This achieves uniform cooling of the adapted annular base and support arm, improving the pass rate of weld repairs.

[0011] Specifically, the arc-shaped block is detachably fixed inside the matching annular base. The arc length of the arc-shaped block only covers a part of the inner wall of the annular base, allowing the installation position of the arc-shaped block to be flexibly adjusted circumferentially according to the welding repair position. This actively avoids the welding repair position on the inner wall of the matching annular base. After the shielding gas is discharged from the left and right ends of the arc-shaped block, it continuously flows through the vicinity of the welding repair position, continuously cooling the welding repair position locally. This avoids the local accumulation of heat in the repair area and further improves the pass rate of welding repair.

[0012] Preferably, the elastic support mechanism includes two elastically extendable support rods, which are respectively disposed on the left and right sides of the arc-shaped block. One end of each support rod is fixed at the middle height position of the inner wall of the arc-shaped block, and the other end of each support rod is fixedly connected to an arc-shaped pad, which has an arc-shaped surface that conforms to the inner wall of the matching annular base. In the reset state, the length of each support rod is greater than the diameter of the matching annular base. The length of each support rod is in an elastic state that is less than the difference between the diameter of the matching annular base and the thickness of the arc-shaped block and the thickness of the arc-shaped pad. The two support rods are fixedly connected by a connecting rod. The support rods press the arc-shaped pad against the inner wall surface of the annular base, reliably supporting and fixing the arc-shaped block to the inner side of the annular base, ensuring that the arc-shaped block does not shift or loosen during welding.

[0013] Preferably, the support rod includes a sleeve and a movable rod; one end of the sleeve is fixed to the inner wall of the arc-shaped block, and the other end of the sleeve is an open end; one end of the movable rod is slidably inserted into the open end of the sleeve and is fixedly connected to the bottom of the sleeve by a spring; the other end of the movable rod is fixedly connected to the arc-shaped pad; the connecting rod is fixed to the sleeve. The spring causes the movable rod to extend outward, so that the arc-shaped pad, in its reset state, presses against the inner wall of the annular base, reliably supporting and fixing the arc-shaped block to the inner side of the annular base, ensuring that the tooling does not shift or loosen during welding.

[0014] Preferably, the arc-shaped block is made of stainless steel, and the outer wall of the arc-shaped block has a tungsten metal coating. This gives the arc-shaped block good structural strength and thermal conductivity, enabling it to adapt to the high-temperature working environment during welding repair. The high-temperature resistant tungsten metal coating will not soften, melt, or burn off under the high-temperature welding environment, and can form a stable isolation layer between the outer wall of the stainless steel arc-shaped block and the inner wall of the thin-walled annular base.

[0015] Preferably, the support rod is made of stainless steel, and the arc-shaped pad is also made of stainless steel; the outer wall of the arc-shaped pad has a tungsten plating layer. This ensures that both the support rod and the arc-shaped pad have good structural strength, and the tungsten plating layer on the outer wall of the arc-shaped pad forms a stable physical isolation layer under the high-temperature welding environment.

[0016] Preferably, the spacing between two adjacent longitudinal grooves is 3mm to 8mm; the spacing between two adjacent circumferential grooves is 3mm to 8mm. This ensures that the distribution density of the longitudinal and circumferential grooves is moderate.

[0017] Preferably, the width of the longitudinal groove is not less than 1 mm and not more than 4 mm; the depth of the longitudinal groove is greater than 1 mm and less than 3 mm; the width of the circumferential groove is not less than 1 mm and not more than 4 mm; and the depth of the circumferential groove is greater than 1 mm and less than 3 mm.

[0018] Beneficial effects: In this utility model, the arc-shaped surface of the support rod presses against the inner wall of the annular base in the reset state, reliably supporting and fixing the arc-shaped block to the inner side of the annular base. Protective gas is introduced into the longitudinal and circumferential groove arrays through the gas source connector via the channel. After flowing along the longitudinal and circumferential groove arrays, the protective gas is discharged from the left and right ends of the arc-shaped block. The continuously flowing protective gas evenly covers the inner wall of the adapted annular base and the outer wall of the support arm root, and fully exchanges heat with the inner wall of the adapted annular base and the outer wall of the support arm root, and removes the heat generated by welding, thereby achieving uniform cooling of the adapted annular base and support arm and improving the pass rate of welding repair. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the turbojet engine nozzle ring repair welding internal cooling protector of this utility model;

[0020] Figure 2 This is a rear view structural schematic diagram of the internal cooling system of the turbojet engine nozzle ring repair welding internal cooling protector of this utility model.

[0021] Figure 3 This is a schematic diagram illustrating the structure of the gas source connector for the internal cooling protector for the nozzle ring repair welding of the turbojet engine of this utility model.

[0022] Figure 4 This is a schematic diagram illustrating the structure of the arc-shaped pad block in the internal cooling protector for the nozzle ring repair welding of the turbojet engine of this utility model.

[0023] Figure 5 This is a schematic diagram of the nozzle ring structure of the internal coolant protector for the nozzle ring of a turbojet engine according to this utility model.

[0024] In the diagram, 1. Annular base; 2. Support arm; 3. Nozzle ring; 4. Flanged edge; 5. Arc-shaped block; 6. Longitudinal groove; 7. Circumferential groove; 8. Air source connector; 9. Recess; 10. Support rod; 11. Arc-shaped pad; 12. Connecting rod. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of the utility model easier to understand, the utility model will be further explained below with reference to specific illustrations.

[0026] Reference Figures 1-5The internal cooling protector for repairing the nozzle ring of a turbojet engine includes an internal cooling system that matches the annular base 1 and support arm 2 of the nozzle ring. The internal cooling system includes an arc-shaped block 5 and an arc-shaped pad 11. The arc-shaped block 5 and the arc-shaped pad 11 are connected by an elastic support mechanism, extending outwards from both ends inside the annular base 1 to form an elastically fixed structure. The height of the arc-shaped block 5 is set to be less than the height of the matched annular base 1, with a difference greater than 1 mm and less than 5 mm. A longitudinal groove array and a circumferential groove array are formed on the outer wall of the arc-shaped block 5. The longitudinal groove array includes at least two longitudinal grooves 6; the circumferential groove array includes at least two circumferential grooves 7; the longitudinal grooves 6 and the circumferential grooves 7 are connected at their intersection. An air source connection is provided on the inner wall of the arc-shaped block 5. The head 8; the air source connector 8 communicates with the intersection of the longitudinal groove 6 and the circumferential groove 7 on the outer wall of the arc-shaped block 5 through the channel, thereby forming a communication between the air source connector 8 and the longitudinal groove array and the circumferential groove array on the arc-shaped block 5; the outer wall of the arc-shaped block 5 has an outward expansion section with a gradually increasing radius from bottom to top, adapting to the changing curvature of the outer wall of the adapted annular base 1 at a position above the middle; the arc length of the outward expansion section covers at least four support arms 2 in the circumferential direction of the adapted nozzle ring 3, and the outward expansion section forms a recess 9 that fits against the root of the support arm 2 outside the support arm 2; at least three longitudinal grooves 6 and at least five circumferential grooves 7 all pass through the recess 9; the circumferential grooves 7 penetrate the left and right ends of the arc-shaped block 5 along the arc length direction of the arc-shaped block 5.

[0027] In the above design, the elastic support mechanism presses the arc-shaped block 5 and the arc-shaped pad 11 against the inner wall of the annular base 1. Shielding gas is introduced through the gas source connector 8 into the longitudinal and circumferential groove arrays via channels. After flowing along the longitudinal and circumferential groove arrays, the shielding gas is discharged from the left and right ends of the arc-shaped block 5. The continuously flowing shielding gas evenly covers the inner wall of the adapted annular base 1 and the outer wall of the root of the support arm 2, allowing for sufficient heat exchange with these surfaces and carrying away the heat generated during welding. This achieves uniform cooling of the adapted annular base 1 and the support arm 2, improving the pass rate of weld repair.

[0028] Specifically, the elastic support mechanism allows the arc-shaped block 5 to be detachably connected inside the matching annular base 1. The arc length of the arc-shaped block 5 only covers a part of the inner wall of the annular base 1, so that the installation position of the arc-shaped block 5 can be flexibly adjusted circumferentially according to the welding repair position, so as to actively avoid the welding repair position on the inner wall of the matching annular base 1. After the protective gas is discharged from the left and right ends of the arc-shaped block 5, it continues to flow near the welding repair position, continuously cooling the welding repair position locally, avoiding the local accumulation of heat in the repair area, and further improving the qualification rate of welding repair.

[0029] like Figure 1 and Figure 2 and Figure 3 and Figure 4 The elastic support mechanism includes two elastically telescopic support rods 10, which are respectively arranged on the left and right sides of the arc-shaped block 5. One end of each support rod 10 is fixed at the middle height position of the inner wall of the arc-shaped block 5, and the other end of each support rod 10 is fixedly connected to the arc-shaped pad 11. The arc-shaped pad 11 has an arc-shaped surface that fits against the inner wall of the annular base 1. In the reset state, the length of the support rod 10 is greater than the diameter of the matching annular base 1. The length of the support rod 10 has an elastic state that is less than the difference between the diameter of the matching annular base 1 and the thickness of the arc-shaped block 5 and the thickness of the arc-shaped pad 11. The two support rods 10 are fixedly connected by a connecting rod 12.

[0030] The support rod 10 presses the arc-shaped pad 11 against the inner wall of the annular base 1, reliably supporting and fixing the arc-shaped block 5 to the inner side of the annular base 1, ensuring that the arc-shaped block 5 does not shift or loosen during the welding process.

[0031] The support rod 10 includes a sleeve and a movable rod; one end of the sleeve is fixed to the inner wall of the arc-shaped block 5, and the other end of the sleeve is an open end; one end of the movable rod is slidably inserted into the open end of the sleeve and is fixedly connected to the bottom of the sleeve by a spring; the other end of the movable rod is fixedly connected to the arc-shaped pad 11; the connecting rod 12 is fixed on the sleeve.

[0032] The arc-shaped block 5 is made of stainless steel, and its outer wall has a tungsten plating. This gives the arc-shaped block 5 good structural strength and thermal conductivity, enabling it to withstand the high-temperature working environment during welding repair. The high-temperature resistant tungsten plating will not soften, melt, or burn under the high-temperature welding environment, forming a stable isolation layer between the outer wall of the stainless steel arc-shaped block 5 and the inner wall of the thin-walled annular base 1. This prevents metal adhesion or weld slag adhesion between the outer wall of the arc-shaped block 5 and the inner wall of the annular base 1 and the outer wall of the support arm 2 due to the conduction of high welding temperatures. This also prevents the arc-shaped block 5 from being unable to be easily removed from the annular base 1 after welding, and also avoids tearing or damage to the inner wall surface of the annular base 1 due to adhesion and peeling, ensuring the detachability of the arc-shaped block 5 and the surface integrity of the inner wall surface of the annular base 1.

[0033] The support rod 10 is made of stainless steel, and the arc-shaped pad 11 is also made of stainless steel; the outer wall of the arc-shaped pad 11 has a tungsten metal coating. This gives the support rod 10 and the arc-shaped pad 11 good structural strength, and the tungsten metal coating on the outer wall of the arc-shaped pad 11 forms a stable physical isolation layer under the high temperature of welding, preventing the arc-shaped pad 11 from sticking to the inner wall of the annular base 1 at high temperature, ensuring that the fixture can be easily disassembled after welding. At the same time, the high hardness and wear resistance of the tungsten coating make the arc-shaped pad 11 less prone to wear during repeated pressing and sliding, ensuring the long-term stability and reliability of the support rod 10 in positioning.

[0034] The spring extends the movable rod outward, causing the arc-shaped pad 11 to press against the inner wall of the annular base 1 in the reset state, reliably supporting and fixing the arc-shaped block 5 to the inner side of the annular base 1. This ensures that the tooling does not shift or loosen during welding. When disassembly or position adjustment is required, the connecting rod 12 fixed on the sleeve is pulled, causing the sleeve and arc-shaped block 5 to move as a whole. This causes the movable rod to compress the spring and retract into the sleeve, disengaging the arc-shaped pad 11 from the inner wall of the annular base 1. The arc-shaped block 5 can then be removed or adjusted to other positions, achieving quick assembly, disassembly, and flexible adjustment of the arc-shaped block 5.

[0035] The spacing between two adjacent longitudinal grooves 6 is 3mm to 8mm; the spacing between two adjacent circumferential grooves 7 is 3mm to 8mm. This ensures that the distribution density of the longitudinal grooves 6 and circumferential grooves 7 is moderate, which not only ensures smooth and uniform gas flow and distribution in the longitudinal grooves 6 and circumferential grooves 7, avoiding the formation of gas-covered dead zones due to excessive spacing, but also prevents the structural strength of the arc-shaped block 5 from being weakened due to the longitudinal grooves 6 and circumferential grooves 7 being too dense.

[0036] The width of the longitudinal groove 6 is not less than 1 mm and not more than 4 mm; the depth of the longitudinal groove 6 is greater than 1 mm and less than 3 mm; the width of the circumferential groove 7 is not less than 1 mm and not more than 4 mm; the depth of the circumferential groove 7 is greater than 1 mm and less than 3 mm. This ensures that the longitudinal groove 6 and the circumferential groove 7 have a sufficiently large flow cross-sectional area to ensure smooth flow of protective gas with low resistance, while avoiding weakening the structural strength of the arc-shaped block 5 due to excessively large dimensions of the longitudinal groove 6 and the circumferential groove 7.

[0037] When in use, press the arc-shaped pad 11, and the movable rod slides into the sleeve after being subjected to force. The spring is compressed, and the length of the support rod 10 is shortened to less than the difference between the inner diameter of the annular base 1 and the thickness of the arc-shaped block 5 and the thickness of the arc-shaped pad 11. Place the arc-shaped block 5 inside the matching annular base 1. The arc-shaped block 5 avoids the area to be welded and is located beside the area to be welded.

[0038] Make the outer wall of the arc-shaped block 5 face the inner wall of the annular base 1 and the outer wall of the support arm 2. The outward expansion section of the outer wall of the arc-shaped block 5 corresponds to the flared structure of the annular base 1. Align the recess 9 on the outward expansion section with the root of the support arm 2. Release the arc-shaped pad 11, the spring rebounds, the movable rod extends outward, and the arc-shaped pad 11 presses against the inner wall of the annular base 1 under the action of the spring force, so that the arc-shaped block 5 is reliably supported and fixed to the inner side of the annular base 1.

[0039] The lower edge of the fitting annular base 1 has a flange 4, and the bottom of the arc-shaped block 5 rests on the flange 4.

[0040] An external protective gas source is connected to the gas source connector 8 on the inner wall of the arc-shaped block 5. The protective gas is introduced through the gas source connector 8 and transported through the channel to the intersection of the longitudinal groove 6 and the circumferential groove 7 on the outer wall of the arc-shaped block 5. Since the longitudinal groove array and the circumferential groove array are interconnected at the intersection, the gas is quickly diverted to each longitudinal groove 6 and circumferential groove 7 after being introduced. It flows evenly along the groove network and covers the entire outer wall of the arc-shaped block 5. When the continuously flowing protective gas flows over the inner wall of the annular base 1 and the outer wall of the root of the support arm 2, it performs sufficient heat exchange on the inner wall of the annular base 1 and the outer wall of the root of the support arm 2, carrying away the heat generated by welding and achieving cooling of the inner wall of the annular base 1 and the support arm 2. After the protective gas flows along the circumferential groove 7 to both ends of the arc-shaped block 5, it is discharged from the left and right ends of the arc-shaped block 5 and continues to flow near the welding repair position, continuously cooling the welding repair position locally. This avoids the local accumulation of heat in the repair area and further reduces the risk of temperature and thermal stress concentration in the welding heat-affected zone.

[0041] With the protective gas continuously supplied, the casting defects on the inner wall of the annular base 1 are repaired by welding. After the welding repair is completed, the operator can pull the connecting rod 12, causing the movable rod to compress the spring and retract into the sleeve. The arc-shaped pad 11 is disengaged from the inner wall of the annular base 1, thereby driving the support rod 10, the arc-shaped pad 11, and the arc-shaped block 5 to move as a whole along the circumference of the annular base 1 to other suitable positions. The connecting rod 12 is released, and the spring rebounds, causing the arc-shaped pad 11 to press against the inner wall of the annular base 1 again. The arc-shaped block 5 is then tightened and fixed in a new position. Defects in other positions of the annular base 1 are repaired.

[0042] The foregoing has shown and described the basic principles and main features of the utility model, as well as its advantages. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the utility model. Various changes and modifications can be made to the utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A turbojet engine nozzle ring repair welding internal coolant protector, characterized in that: Includes an internal cooling system that is compatible with the annular base (1) and support arm (2) of the nozzle ring; The internal cooling system includes an arc-shaped block (5) and an arc-shaped pad (11). The arc-shaped block (5) and the arc-shaped pad (11) are connected by an elastic support mechanism, which expands to both ends inside the annular base (1) to form an elastic fixed structure. The height of the arc-shaped block (5) is set to be less than the height of the adapted annular base (1), with a difference greater than 1 mm and less than 5 mm. The outer wall of the arc-shaped block (5) is provided with a longitudinal groove array and a circumferential groove array; The longitudinal groove array includes at least two longitudinal grooves (6); The circumferential groove array includes at least two circumferential grooves (7); The longitudinal groove (6) and the circumferential groove (7) are connected at their intersection; An air source connector (8) is provided on the inner wall of the arc-shaped block (5); The gas source connector (8) is connected to the intersection of the longitudinal groove (6) and the circumferential groove (7) on the outer wall of the arc block (5) through the channel. Thus, the gas source connector (8) is connected to both the longitudinal groove array and the circumferential groove array on the arc block (5). The outer wall of the arc-shaped block (5) has an outward expansion section with a gradually increasing radius from bottom to top, adapting to the changing curvature of the outer wall of the annular base (1) it is adapted to; The arc length of the outward expansion section covers at least four support arms (2) in the circumferential direction of the nozzle ring (3) to which it is adapted, and the outward expansion section forms a recess (9) on the outside of the support arm (2) that fits against the root of the support arm (2). At least three of the longitudinal grooves (6) and at least five of the circumferential grooves (7) pass through the recess (9); The circumferential groove (7) extends through the left and right ends of the arc block (5) along the arc length direction.

2. The turbojet engine nozzle ring repair welding internal cooling protector according to claim 1, characterized in that: The elastic support mechanism includes two elastically telescopic support rods (10), which are respectively set on the left and right sides of the arc-shaped block (5); One end of each of the two support rods (10) is fixed at the middle height position of the inner wall of the arc-shaped block (5), and the other end of each of the two support rods (10) is fixedly connected to the arc-shaped pad (11); In the reset state, the length of the support rod (10) is greater than the diameter of the adapted annular base (1); The length of the support rod (10) is less than the difference between the diameter of the adapted annular base (1) and the thickness of the arc block (5) and the thickness of the arc pad (11); The two support rods (10) are fixedly connected by a connecting rod (12).

3. The turbojet engine nozzle ring repair welding internal coolant protector according to claim 2, characterized in that: The support rod (10) includes a sleeve and a movable rod; One end of the sleeve is fixed to the inner wall of the arc-shaped block (5), and the other end of the sleeve is an open end; One end of the movable rod can be slidably inserted into the open end of the sleeve, and is fixedly connected to the bottom of the sleeve by a spring; The other end of the movable rod is fixedly connected to the arc-shaped pad (11); The connecting rod (12) is fixed on the sleeve.

4. The internal cooling protector for repairing the nozzle ring of a turbojet engine according to claim 1, characterized in that: The arc-shaped block (5) is made of stainless steel and has a tungsten metal coating on its outer wall.

5. The internal cooling protector for repairing the nozzle ring of a turbojet engine according to claim 2, characterized in that: The support rod (10) is made of stainless steel, and the arc-shaped pad (11) is made of stainless steel. The outer wall of the arc-shaped pad (11) has a tungsten metal coating.

6. The internal cooling protector for repairing the nozzle ring of a turbojet engine according to claim 1, characterized in that: The interval between two adjacent longitudinal grooves (6) is 3mm~8mm; The interval between two adjacent circumferential grooves (7) is 3mm~8mm.

7. The internal cooling protector for repairing the nozzle ring of a turbojet engine according to claim 1, characterized in that: The width of the longitudinal groove (6) is not less than 1 mm and not more than 4 mm; The depth of the longitudinal groove (6) is greater than 1 mm and less than 3 mm; The width of the circumferential groove (7) is not less than 1 mm and not more than 4 mm; The depth of the circumferential groove (7) is greater than 1 mm and less than 3 mm.

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