External repair welding protection tool for overall temperature reduction of nozzle ring

Abstract

The utility model relates to a welding technical field, especially relates to a nozzle ring overall cooling external repair welding protection tool, including two with the half ring of nozzle ring's annular base matched half circle, the both ends of each half ring are equipped with butt joint mechanism, and two half rings are detachable spliced into whole circle structure through the butt joint mechanism of both ends, the height of half ring is set as: less than the height of the matched annular base, the difference is greater than 0.2mm, less than 0.8mm, longitudinal groove array and transverse groove array are set up on the inner wall of half ring, and longitudinal groove array includes at least two longitudinal grooves. By setting half ring outside the matched annular base, the protection gas of continuous flow is evenly covered on the outer wall surface of the matched annular base, carries out sufficient heat exchange with the outer wall surface of the matched annular base and takes away the heat generated by welding, realizes the uniform cooling of the matched annular base, improves the qualified rate of welding repair.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, and in particular to an external welding protection fixture for overall cooling of the nozzle ring. 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 an external welding protection fixture for overall cooling of the nozzle ring, so as 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 external welding protection fixture for overall nozzle ring cooling includes two semicircular rings that match the annular base of the nozzle ring. Each semicircular ring has a docking mechanism at both ends, and the two semicircular rings can be detachably spliced ​​into a complete circular structure via these docking mechanisms. The height of each semicircular ring is set to be less than the height of the matching annular base, with a difference greater than 0.2mm and less than 0.8mm. The inner wall of each semicircular ring has a longitudinal groove array and a transverse groove array. The longitudinal groove array includes at least two longitudinal grooves, and the transverse groove array includes at least two transverse grooves. The longitudinal and transverse grooves communicate at their intersection. An air source interface is provided on the outer wall of each semicircular ring. The air source interface, through a channel, connects to the longitudinal and transverse grooves on the inner wall of the semicircular ring. The grooves converge at the junction, thus connecting the air source interface with both the longitudinal and transverse groove arrays on the semicircular ring. The radius variation of the inner wall of the semicircular ring in the height direction is set to be greater than the radius of the outer wall of the adapted annular base at the same height, with a difference greater than 0.3 mm and less than 1 mm. The inner wall of the semicircular ring has a flared section above the middle, with a gradually increasing radius from bottom to top, adapting to the changing curvature of the outer wall of the adapted annular base, thereby forming a ring surface with a gradually increasing radius. The transverse groove extends through the left and right ends of the inner wall of the semicircular ring along the arc length direction. After the two semicircular rings are spliced, a gap is left between the end faces of the two semicircular rings. The two ends of the transverse groove extend into the gap, forming a connection.

[0010] In the above design, protective gas is introduced into the longitudinal and transverse groove arrays through the gas source interface via the channel. After flowing along the longitudinal and transverse groove arrays, the protective gas is discharged through the gap between the end faces of the two semi-circular rings. The continuously flowing protective gas evenly covers the outer wall surface of the matching annular base, and fully exchanges heat with the outer wall surface of the matching annular base, and carries away the heat generated by welding, thereby achieving uniform cooling of the matching annular base and improving the pass rate of welding repair.

[0011] Meanwhile, the semicircular ring surrounds the air inlet of the support arm, allowing the protective gas to cover the outer wall of the annular base while simultaneously being discharged through the gas channel inside the support arm and out of the nozzle ring's outlet. This achieves simultaneous cooling of the internal structure of the nozzle ring, increases the heat exchange area and heat dissipation path, further reduces the temperature of the heat-affected zone in the welding area, and the splicing of the two semicircular rings forms a circumferential external constraint on the adapted annular base, providing structural support during the welding process. This suppresses the risk of thermal stress concentration and deformation cracking of the thin-walled annular base during welding repair, improving the pass rate and quality reliability of welding repair.

[0012] Preferably, the semi-circular ring is made of stainless steel, and the inner wall of the semi-circular ring has a tungsten metal coating. This ensures that the semi-circular ring has sufficient structural strength and good thermal conductivity to cooperate with gas cooling and improve heat dissipation efficiency. The high-temperature stability of the tungsten metal coating forms a physical isolation between the semi-circular ring and the annular base, preventing the semi-circular ring from sticking to the matching annular base under high welding temperatures, and ensuring that the semi-circular ring can be smoothly disassembled without damaging the surface of the annular base.

[0013] Preferably, the gas source interface is located in the middle of the semi-circular ring.

[0014] Preferably, the docking mechanism at the end of the semicircular ring is fixed to the outside of the semicircular ring.

[0015] Preferably, the docking mechanism is a vertical metal block with bolt holes; the metal block is bonded to the outer side of the semi-circular ring using an adhesive. This does not weaken the structural strength of the semi-circular ring.

[0016] Preferably, two adjacent metal blocks are fixedly connected by bolts passing through bolt holes; after the two metal blocks are fixedly connected, a gap is left between the two metal blocks, the width of which is not greater than 1 cm and not less than 0.1 mm; the gap between the two metal blocks communicates with the gap between the end faces of the two semicircular rings. The gap between the two adjacent metal blocks, together with the gap between the end faces of the two semicircular rings, forms a complete exhaust channel, further ensuring the stability and continuity of gas flow.

[0017] Preferably, the width of the longitudinal and transverse grooves is not less than 1 mm and not more than 5 mm; the depth of the transverse groove and the depth of the longitudinal groove are greater than 0.5 mm and less than 5 mm. The longitudinal and transverse grooves have sufficiently large flow space to ensure low resistance and uniform flow velocity when the protective gas flows within the grooves.

[0018] Preferably, the interval between two adjacent longitudinal grooves is 2mm to 10mm; the interval between two adjacent transverse grooves is 2mm to 10mm. This ensures smooth and uniform gas flow and distribution within the longitudinal and transverse grooves without weakening the structural strength of the semicircular ring 4.

[0019] Preferably, the width of the gap between the two end faces of the two semicircular rings is no more than 1 cm and no less than 0.1 mm. This ensures that the protective gas can be discharged smoothly without causing the protective gas to leak out too quickly and affect the cooling effect, thus ensuring the continuity and stability of the protective gas flow.

[0020] Beneficial effects: In this utility model, protective gas is introduced into the longitudinal and transverse groove arrays through the gas source interface and the channel. After flowing along the longitudinal and transverse groove arrays, the protective gas is discharged from the gap between the end faces of the two semi-circular rings. The continuously flowing protective gas evenly covers the outer wall surface of the matching annular base, and fully exchanges heat with the outer wall surface of the matching annular base, and removes the heat generated by welding, thereby achieving uniform cooling of the matching annular base and improving the pass rate of welding repair. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the external welding protection fixture for overall cooling of the nozzle ring of this utility model.

[0022] Figure 2 This is a top-view structural diagram of the external welding protection fixture for overall cooling of the nozzle ring of this utility model.

[0023] Figure 3 This is a schematic diagram of the circular structure of the external welding protection fixture for overall cooling of the nozzle ring of this utility model.

[0024] Figure 4 This is a schematic diagram of the semi-circular ring of the external welding protection fixture for overall cooling of the nozzle ring of this utility model.

[0025] Figure 5 This is a schematic diagram of the nozzle ring structure of the external welding protection fixture for overall cooling of the nozzle ring of this utility model.

[0026] In the diagram, 1 is the annular base; 2 is the upper flange; 3 is the lower flange; 4 is the semi-circular ring; 5 is the longitudinal groove; 6 is the transverse groove; 7 is the air source interface; 8 is the metal block; 9 is the support arm; 10 is the nozzle ring; 11 is the air inlet; and 12 is the air outlet. Detailed Implementation

[0027] 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.

[0028] Reference Figures 1-5The external welding protection fixture for overall nozzle ring cooling includes two semicircular rings 4 that match the annular base 1 of the nozzle ring. Each semicircular ring 4 has a docking mechanism at both ends, allowing the two semicircular rings 4 to be detachably joined into a complete circular structure via these mechanisms. The height of the semicircular ring 4 is set to be less than the height of the matching annular base 1, with a difference greater than 0.2mm and less than 0.8mm. The inner wall of the semicircular ring 4 has a longitudinal groove array and a transverse groove array. The longitudinal groove array includes at least two longitudinal grooves 5; the transverse groove array includes at least two transverse grooves 6. The longitudinal grooves 5 and transverse grooves 6 are connected at their intersection. The outer wall of the semicircular ring 4 has an air source interface 7. The air source interface 7 connects to the longitudinal grooves 5 and transverse grooves 6 on the inner wall of the semicircular ring 4 via a channel. The intersection of the grooves 6 is connected, thus the air source interface 7 is connected to both the longitudinal groove array and the transverse groove array on the semicircular ring 4; the radius variation of the inner wall of the semicircular ring 4 in the height direction is set to be greater than the radius of the outer wall of the adapted annular base 1 at the same height, with a difference greater than 0.3mm and less than 1mm; the inner wall of the semicircular ring 4 has a flared 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, above the middle, thus forming an annular surface with a gradually increasing radius; the transverse groove 6 penetrates the left and right ends of the inner wall of the semicircular ring 4 along the arc length direction; after the two semicircular rings 4 are spliced, a gap is left between the end faces of the two semicircular rings 4; the two ends of the transverse groove 6 penetrate into the gap respectively, forming a connection.

[0029] In the above design, protective gas is introduced into the longitudinal and transverse groove arrays through the gas source interface 7 via the channel. After flowing along the longitudinal and transverse groove arrays, the protective gas is discharged through the gap between the end faces of the two semi-circular rings 4. The continuously flowing protective gas evenly covers the outer wall surface of the matching annular base 1, and fully exchanges heat with the outer wall surface of the matching annular base 1, and removes the heat generated by welding, thereby achieving uniform cooling of the matching annular base 1 and improving the pass rate of welding repair.

[0030] Meanwhile, the semicircular ring 4 surrounds the air inlet 11 of the support arm 9, allowing the protective gas to cover the outer wall of the annular base 1 while being discharged through the gas channel inside the support arm 9 and the air outlet 12 of the nozzle ring 10. This achieves simultaneous cooling of the internal structure of the nozzle ring, increases the heat exchange area and heat dissipation path, further reduces the temperature of the heat-affected zone in the welding area, and the splicing of the two semicircular rings 4 forms a circumferential external constraint on the adapted annular base 1, providing structural support during the welding process. This suppresses the risk of thermal stress concentration and deformation cracking of the thin-walled annular base 1 during the welding repair process, and improves the pass rate and quality reliability of the welding repair.

[0031] The semi-circular ring 4 is made of stainless steel, and its inner wall is coated with a tungsten metal layer. This gives the semi-circular ring 4 good structural strength and thermal conductivity, enabling it to withstand 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. It forms a stable isolation layer between the inner wall of the stainless steel semi-circular ring 4 and the outer wall of the thin-walled annular base 1, preventing metal adhesion or weld slag adhesion between the inner wall of the semi-circular ring 4 and the outer wall of the annular base 1 due to the conduction of high welding temperature. This prevents the semi-circular ring 4 from being unable to be easily removed from the annular base 1 after welding, and also avoids tearing or damage to the outer wall surface of the annular base 1 due to adhesion and peeling, ensuring the detachability of the semi-circular ring 4 and the surface integrity of the outer wall surface of the annular base 1.

[0032] In addition, stainless steel has good thermal conductivity, which can quickly conduct the heat generated in the welding area of ​​the annular base 1 to the entire semi-circular ring 4, expand the heat dissipation area, and carry away the heat through the continuous flow of protective gas, thereby improving the overall heat dissipation efficiency and further enhancing the cooling effect on the annular base 1.

[0033] like Figure 1 and Figure 2 As shown, the gas source interface 7 is located in the middle of the semi-circular ring 4. This ensures that the flow path of the protective gas in the longitudinal and transverse groove arrays is symmetrical and uniform, avoiding the problem that the gas will preferentially flow to the closer end and the gas flow at the other end will be insufficient due to the gas source interface 7 being set too high or too low. This allows the protective gas to be evenly distributed on the outer wall of the adapted annular base 1, ensuring consistent cooling effect in all areas of the annular base 1.

[0034] like Figure 1 and Figure 2 and Figure 3 The docking mechanism at the end of the semicircular ring 4 is fixed to the outside of the semicircular ring 4. The longitudinal and transverse groove arrays on the inner wall of the semicircular ring 4 are not occupied or interfered with by the docking mechanism.

[0035] The docking mechanism uses a vertical metal block 8 with bolt holes. The metal block 8 is bonded to the outside of the semi-circular ring 4 with adhesive. The bonding and fixing of the metal block 8 to the semi-circular ring 4 does not weaken the structural strength of the semi-circular ring 4.

[0036] like Figure 3As shown, two adjacent metal blocks 8 are fixedly connected by bolts passing through bolt holes. After the two metal blocks 8 are fixedly connected, a gap is left between them. The width of the gap between the two metal blocks 8 is not greater than 1 cm and not less than 0.1 mm. The gap between the two metal blocks 8 and the gap between the two end faces of the two semicircular rings 4 are connected to form a complete exhaust channel, further ensuring the stability and continuity of gas flow.

[0037] The width of the longitudinal groove 5 and the transverse groove 6 is not less than 1 mm and not more than 5 mm; the depth of the transverse groove 6 and the depth of the longitudinal groove 5 are both greater than 0.5 mm and less than 5 mm. The longitudinal groove 5 and the transverse groove 6 have sufficiently large flow space to ensure that the protective gas has low resistance and uniform flow velocity when flowing in the grooves, and can be smoothly distributed along the longitudinal groove 5 and the transverse groove 6 to various areas of the inner wall of the semi-circular ring 4, so as to achieve comprehensive gas protection and uniform cooling of the outer wall of the annular base 1.

[0038] The spacing between two adjacent longitudinal grooves 5 is 2mm to 10mm, and the spacing between two adjacent transverse grooves 6 is 2mm to 10mm. This ensures that the distribution density of the longitudinal grooves 5 and transverse grooves 6 is moderate, which guarantees smooth and uniform gas flow within the longitudinal grooves 5 and transverse grooves 6 without weakening the structural strength of the semi-circular ring 4.

[0039] The width of the gap between the two end faces of the two semicircular rings 4 is no greater than 1cm and no less than 0.1mm. This ensures that the protective gas can be discharged smoothly without causing the protective gas to leak out too quickly and affect the cooling effect, thus ensuring the continuity and stability of the protective gas flow.

[0040] The upper edge of the fitting annular base 1 has a flange, called the upper flange 2, and the lower edge of the fitting annular base 1 has a flange, called the lower flange 3.

[0041] Two semicircular rings 4 are fitted onto the outside of the matching, ring-shaped base 1 to be repaired and closed. After closing, the bolt holes on the two adjacent metal blocks 8 are aligned with each other. The bolts are inserted into the bolt holes and tightened to fix the two metal blocks 8 together, thereby locking and splicing the two semicircular rings 4 into a complete circular structure.

[0042] After splicing, there is a gap between the two semicircular rings 4 end faces, and there is also a gap between the two adjacent metal blocks 8. The gap between the two adjacent metal blocks 8 is connected with the gap between the two semicircular rings 4 end faces to form a complete exhaust channel.

[0043] Meanwhile, each metal block 8 has a notch at the top of its inner wall. The metal block 8 is snapped onto the outside of the upper flange 2 through the notch, forming a detachable fixed connection between the metal block 8 and the matching annular base 1, thereby improving the connection stability between the semicircular ring 4 and the matching annular base 1.

[0044] After the semicircular ring 4 is fitted onto the outside of the matching annular base 1 to be repaired, the distance between the outer wall of the semicircular ring 4 and the center of the matching annular base 1 is less than the distance between the outer wall of the upper flange 2 and the center of the matching annular base 1, and the distance between the outer wall of the semicircular ring 4 and the center of the matching annular base 1 is less than the distance between the lower flange 3 and the center of the matching annular base 1. The upper flange 2 and the lower flange 3 are pressed onto the upper edge and lower edge of the semicircular ring 4 respectively. Since the longitudinal groove 5 penetrates the upper and lower ends of the inner wall of the semicircular ring 4 along the height direction of the semicircular ring 4, after the semicircular ring 4 is installed in place, the upper flange 2 and the lower flange 3 respectively cover and seal the openings at the upper and lower ends of the longitudinal groove 5, so that the gas in the longitudinal groove 5 can only flow and discharge along the end face of the semicircular ring 4, and cannot leak from the upper and lower ends, ensuring that the protective gas flows along the predetermined path.

[0045] An external protective gas source is connected to the gas source interface 7 on the outer wall of the semi-circular ring 4. The protective gas is introduced through the gas source interface 7 and transported through the channel to the intersection of the longitudinal groove 5 and the transverse groove 6 on the inner wall of the semi-circular ring 4. Since the longitudinal groove array and the transverse groove array are interconnected at the intersection, the gas is quickly diverted to each longitudinal groove 5 and transverse groove 6 after being introduced. It flows evenly along the groove network and covers the entire inner wall of the semi-circular ring 4. The protective gas evenly covers the outer wall of the annular base 1, so that the outer wall of the annular base 1 is always under a protective atmosphere during the welding repair process.

[0046] When the continuously flowing protective gas flows over the outer wall of the annular base 1, it undergoes sufficient heat exchange with the outer wall of the annular base 1, carrying away the heat generated during welding and achieving uniform cooling of the outer wall of the annular base 1. The protective gas after heat exchange is discharged to the outside through the gap between the two end faces of the two semi-circular rings 4 and the gap between the two metal blocks 8, completing the complete flow path.

[0047] With the protective gas continuously supplied, the casting defects on the inner wall of the annular base 1 are repaired by welding. After welding, the protective gas is supplied for a period of time until the annular base 1 cools to a safe temperature. Then, the gas source is turned off, the bolts are loosened, and the two semicircular rings 4 are removed from the outside of the annular base 1 to complete all operations.

[0048] 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. An external welding protection fixture for overall cooling of the nozzle ring, characterized in that: Includes two semi-circular rings (4) that match the annular base (1) of the nozzle ring. Each of the semicircular rings (4) has a docking mechanism at both ends, and the two semicircular rings (4) can be detachably spliced ​​into a whole circle structure through the docking mechanism at both ends; The height of the semicircular ring (4) is set to be less than the height of the adapted annular base (1), with a difference greater than 0.2 mm and less than 0.8 mm. The inner wall of the semi-circular ring (4) is provided with a longitudinal groove array and a transverse groove array; The longitudinal groove array includes at least two longitudinal grooves (5); The transverse groove array includes at least two transverse grooves (6); The longitudinal groove (5) and the transverse groove (6) are connected at their intersection; The outer wall of the semi-circular ring (4) is provided with an air source interface (7); The gas source interface (7) is connected to the intersection of the longitudinal groove (5) and the transverse groove (6) on the inner wall of the semi-circular ring (4) through the channel. Thus, the gas source interface (7) is connected to both the longitudinal groove array and the transverse groove array on the semi-circular ring (4). The radius variation of the inner wall of the semicircular ring (4) in the height direction is set to be greater than the radius of the outer wall of the adapted annular base (1) at the same height, with a difference greater than 0.3 mm and less than 1 mm. The inner wall of the semicircular ring (4) has a flared section with a gradually increasing radius from bottom to top, which adapts to the changing curvature of the outer wall of the adapted annular base (1) above the middle, thereby forming an annular surface with a gradually increasing radius. The transverse groove (6) extends through the left and right ends of the inner wall of the semicircular ring (4) along the arc length direction of the semicircular ring (4); After the two semicircular rings (4) are spliced ​​together, a gap is left between the two end faces of the two semicircular rings (4); The two ends of the transverse groove (6) extend into the gap respectively, forming a connection.

2. The external welding protection fixture for overall cooling of the nozzle ring according to claim 1, characterized in that: The semicircular ring (4) is made of stainless steel and has a tungsten metal coating on its inner wall.

3. The external welding protection fixture for overall cooling of the nozzle ring according to claim 1, characterized in that: The gas source interface (7) is located in the middle of the semi-circular ring (4).

4. The external welding protection fixture for overall cooling of the nozzle ring according to claim 1, characterized in that: The docking mechanism at the end of the semicircular ring (4) is fixed to the outside of the semicircular ring (4).

5. The external welding protection fixture for overall cooling of the nozzle ring according to claim 4, characterized in that: The docking mechanism adopts a vertical metal block (8), and bolt holes are provided on the metal block (8); The metal block (8) is bonded to the outside of the semi-circular ring (4) with an adhesive.

6. The external welding protection fixture for overall cooling of the nozzle ring according to claim 5, characterized in that: The two adjacent metal blocks (8) are fixedly connected by bolts through bolt holes; After the two metal blocks (8) are fixedly connected, a gap is left between the two metal blocks (8), and the width of the gap between the two metal blocks (8) is not greater than 1cm and not less than 0.1mm; The gap between the two metal blocks (8) is connected to the gap between the two end faces of the two semicircular rings (4).

7. The external welding protection fixture for overall cooling of the nozzle ring according to claim 1, characterized in that: The width of the longitudinal groove (5) and the transverse groove (6) is not less than 1 mm and not more than 5 mm; The depth of the transverse groove (6) and the depth of the longitudinal groove (5) are both greater than 0.5 mm and less than 5 mm.

8. The external welding protection fixture for overall cooling of the nozzle ring according to claim 1, characterized in that: The interval between two adjacent longitudinal grooves (5) is 2mm~10mm; the interval between two adjacent transverse grooves (6) is 2mm~10mm.

9. The external welding protection fixture for overall cooling of the nozzle ring according to claim 1, characterized in that: The width of the gap between the two end faces of the two semicircular rings (4) shall not be greater than 1cm and not less than 0.1mm.

Images