End cover assembly, combustion chamber and gas turbine

Abstract

The invention discloses an end cover assembly, a combustion chamber and a gas turbine, the end cover assembly comprises an end cover and a cover plate, the end cover is provided with a first end face, the first end face is provided with a runner groove, the runner groove is provided with a first side wall and a second side wall which are opposite, the first side wall comprises a first step surface and a first welding surface, and the second side wall comprises a second step surface and a second welding surface. The first side wall comprises a first step surface and a first welding surface, the second side wall comprises a second step surface and a second welding surface, a first welding groove is defined between the third welding surface and the first welding surface, a second welding groove is defined between the fourth welding surface and the second welding surface, the width of the first step surface is larger than or equal to that of the first welding groove, and the width of the second step surface is larger than or equal to that of the second welding surface. The width of the second step face is larger than or equal to the width of the second welding groove. According to the end cover assembly disclosed by the invention, by optimizing the structure of the end cover assembly, an ultrasonic flaw detection path is clearer, and the interference of a runner structure on a detection path is reduced, so that the accuracy of detecting weld defects is improved.

Description

Technical Field

[0001] This invention relates to the field of gas turbine technology, specifically to an end cap assembly, a combustion chamber, and a gas turbine. Background Technology

[0002] In related technologies, the combustion chamber end cap assembly has several fuel flow channels inside its structure to achieve staged fuel transport. After these channels are formed, they need to be sealed by flow channel cover plates and connected to the end caps by methods such as argon arc welding to form welds. However, in practical applications, weld quality inspection becomes a critical step to ensure the reliability and safety of the welded area. Traditional ultrasonic testing methods are easily affected by the flow channel structure when detecting weld defects, leading to interference with the ultrasonic detection path and making it difficult for the probe to effectively detect weld defects. Furthermore, because the weld is close to the flow channels, the accuracy of ultrasonic testing is limited, making it difficult to accurately determine whether defects exist in the welded area. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention provide an end cap assembly, a combustion chamber, and a gas turbine.

[0005] The end cap assembly of this invention includes an end cap and a cover plate. The end cap has a first end face, and the first end face is provided with a flow channel groove. The flow channel groove has opposing first sidewalls and second sidewalls. The first sidewall includes a first stepped surface and a first welding surface. The first stepped surface is parallel to the first end face, and the first welding surface intersects the first end face and the first stepped surface, respectively. The second sidewall includes a second stepped surface and a second welding surface. The second stepped surface is parallel to the first end face, and the second welding surface intersects the first end face and the second stepped surface, respectively. The cover plate is disposed on the first step surface and the second step surface. The cover plate has a third welding surface and a fourth welding surface opposite to each other. A first welding bevel is defined between the third welding surface and the first welding surface, and a second welding bevel is defined between the fourth welding surface and the second welding surface. The width of the first step surface is greater than or equal to the width of the first welding bevel, and the width of the second step surface is greater than or equal to the width of the second welding bevel.

[0006] In some embodiments, the first welding surface and the third welding surface are both inclined surfaces, and the first welding bevel is V-shaped; and / or the second welding surface and the fourth welding surface are both inclined surfaces, and the second welding bevel is V-shaped.

[0007] In some embodiments, the included angles between the first welding surface and the third welding surface and the first end face are both a1, where a1 is greater than or equal to 70°; and / or the included angles between the second welding surface and the fourth welding surface and the first end face are both a2, where a2 is greater than or equal to 70°.

[0008] In some embodiments, the thickness of the cover plate is t, and the width of the first weld bevel is h1, where h1 = ≥0.73t; and / or the width of the second weld bevel is h2, where h2 = ≥0.73t.

[0009] In some embodiments, the first step surface and the second step surface are at the same height.

[0010] In some embodiments, the width of both the first step surface and the second step surface is 8mm-10mm.

[0011] In some embodiments, the cover plate has a top surface and a bottom surface, the bottom surface abutting against the first step surface and the second step surface, and the top surface being flush with the first end surface.

[0012] In some embodiments, a protrusion is provided on the top surface, and the projection of the protrusion is located within the projection of the flow channel groove in a projection plane parallel to the first end face.

[0013] The combustion chamber of this invention includes the end cap assembly described in any of the above embodiments.

[0014] The gas turbine of this invention includes the end cap assembly described in any of the above embodiments.

[0015] In this embodiment of the invention, the end cap assembly has a first and second step surface of the cover plate with a width greater than or equal to the width of the weld bevel. During ultrasonic testing, the ultrasonic waves can be reflected from the first and second step surfaces and pass through the weld. This provides sufficient space between the end cap and the cover plate to provide a clearer detection path for ultrasonic testing, thus enabling weld inspection and avoiding interference from the flow channel structure. By moving the ultrasonic probe position and adding a receiver to form a phased array, the depth, location, size, and type of welding defects can be further determined.

[0016] Therefore, the end cap assembly of this embodiment of the invention, by optimizing the structure of the end cap assembly, makes the ultrasonic flaw detection path clearer, reduces the interference of the flow channel structure on the detection path, and thus improves the accuracy of detecting weld defects. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the end cap assembly of the first embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the end cap assembly of the second embodiment of the present invention.

[0019] Figure label: 100. End cap assembly; 1. End cap; 101. First end face; 102. Flow channel; 1021. First sidewall; 10211. First stepped surface; 10212. First welding surface; 1022. Second sidewall; 10221. Second stepped surface; 10222. Second welding surface; 2. Cover plate; 201. Third welding surface; 202. Fourth welding surface; 203. Top surface; 2031. Protrusion; 204. Bottom surface. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0021] like Figure 1 and Figure 2 As shown, the end cap assembly 100 of this embodiment includes an end cap 1 and a cover plate 2. The end cap 1 has a first end face 101, and the first end face 101 is provided with a flow channel groove 102. The flow channel groove 102 has opposing first sidewalls 1021 and second sidewalls 1022. The first sidewall 1021 includes a first stepped surface 10211 and a first welding surface 10212. The first stepped surface 10211 is parallel to the first end face 101, and the first welding surface 10212 intersects the first end face 101 and the first stepped surface 10211, respectively. The second sidewall 1022 includes a second stepped surface 10221 and a second welding surface 10222. The second stepped surface 10221 is parallel to the first end face 101, and the second welding surface 10222 intersects the first end face 101 and the second stepped surface 10221, respectively.

[0022] Cover plate 2 is abutting the first stepped surface 10211 and the second stepped surface 10221. Cover plate 2 has opposing third welding surface 201 and fourth welding surface 202. The third welding surface 201 and the first welding surface 10212 define a first welding bevel, and the fourth welding surface 202 and the second welding surface 10222 define a second welding bevel. The width of the first stepped surface 10211 is greater than or equal to the width of the first welding bevel, and the width of the second stepped surface 10221 is greater than or equal to the width of the second welding bevel.

[0023] The end cap assembly 100 of this embodiment of the invention consists of an end cap 1 and a cover plate 2. The cover plate 2 and the flow channel groove 102 on the end cap 1 define a flow channel for staged fuel transportation. After the cover plate 2 is placed on the end cap 1, a first welding bevel and a second welding bevel are formed between the third welding surface 201 and the fourth welding surface 202 on the cover plate 2 and the first welding surface 10212 and the second welding surface 10222 of the end cap 1. By welding within the first welding bevel and the second welding bevel to form a weld, the end cap 1 and the cover plate 2 are driven to connect.

[0024] Specifically, such as Figure 1 and Figure 2 The gray arrows indicate the incident and reflection paths during ultrasonic testing. Because the widths of the first step surface 10211 and the second step surface 10221 of the cover plate 2 are greater than or equal to the width of the weld bevel, ultrasonic waves can be reflected off the first step surface 10211 and the second step surface 10221 during ultrasonic testing, passing through the weld. This provides sufficient space between the end cap 1 and the cover plate 2 to offer a clearer detection path for ultrasonic testing, thus enabling flaw detection at the weld and avoiding interference from the flow channel structure. By moving the ultrasonic probe position and adding receivers to form a phased array, the depth, location, size, and type of welding defects can be further determined.

[0025] Therefore, the end cap assembly 100 of this embodiment of the invention, by optimizing the structure of the end cap assembly 100, makes the ultrasonic flaw detection path clearer, reduces the interference of the flow channel structure on the detection path, and thus improves the accuracy of detecting weld defects.

[0026] In some embodiments, both the first welding surface 10212 and the third welding surface 201 are inclined surfaces, and the first welding bevel is V-shaped.

[0027] V-grooves are easy to weld, and the shape and size of the molten pool are easily controlled during the welding process. V-grooves provide a good weld joint surface, facilitating material filling and reducing the likelihood of incomplete penetration and weld defects. The beveled weld surface makes welding operations more convenient, allowing welding torches or robots to more easily approach the welding area. The beveled design also helps distribute welding heat more evenly across the welding area, thus improving weld quality. The V-grooving design helps form a good weld shape during welding, making it easier for inspection methods such as ultrasonic testing to more accurately detect weld quality. The beveled weld surface helps the welding material spread within the weld, reducing porosity and inclusions. Compared to right-angle weld surfaces, beveled weld surfaces and V-grooves provide more reflective surfaces, helping ultrasonic testing technology to better identify defects in the weld.

[0028] In some embodiments, both the second welding surface 10222 and the fourth welding surface 202 are inclined surfaces, and the second welding bevel is V-shaped.

[0029] V-grooves are easy to weld, and the shape and size of the molten pool are easily controlled during the welding process. V-grooves provide a good weld joint surface, facilitating material filling and reducing the likelihood of incomplete penetration and weld defects. The beveled weld surface makes welding operations more convenient, allowing welding torches or robots to more easily approach the welding area. The beveled design also helps distribute welding heat more evenly across the welding area, thus improving weld quality. The V-grooving design helps form a good weld shape during welding, making it easier for inspection methods such as ultrasonic testing to more accurately detect weld quality. The beveled weld surface helps the welding material spread within the weld, reducing porosity and inclusions. Compared to right-angle weld surfaces, beveled weld surfaces and V-grooves provide more reflective surfaces, helping ultrasonic testing technology to better identify defects in the weld.

[0030] Optionally, such as Figure 1 and Figure 2 As shown, the included angles between the first welding surface 10212 and the third welding surface 201 and the first end face 101 are both a1, where a1 is greater than or equal to 70°. The included angles between the second welding surface 10222 and the fourth welding surface 202 and the first end face 101 are both a2, where a2 is greater than or equal to 70°.

[0031] The angle between the first welding surface 10212 and the third welding surface 201 and the first end face 101 is designed as a1, and a1 is greater than or equal to 70°. The angle between the second welding surface 10222 and the fourth welding surface 202 and the first end face 101 is designed as a2, and a2 is greater than or equal to 70°. This helps non-destructive testing methods such as ultrasonic testing to detect welds more effectively, ensures that ultrasonic waves can pass smoothly through the weld area, and reduces the detection blind zone caused by the geometry of the weld.

[0032] In some embodiments, the thickness of the cover plate 2 is t, and the width of the first weld bevel is h1, where h1 = ≥0.73t. The width of the second weld bevel is h2, where h2 = ≥0.73t.

[0033] Specifically, according to GB / T150 and the fuel pressure P in the flow channel, the present invention obtains the design value t of the thickness of the cover plate 2, and calculates the weld width, that is, the widths h1 and h2 of the first and second welding bevels, based on the thickness t of the cover plate 2.

[0034] The widths h1 and h2 of the welding bevel are calculated based on the thickness t of the cover plate 2 and the included angles a1 and a2 between the welding surface and the first end face 101 of the end cap 1. The formulas h1=2t / tan(a1) and h2=2t / tan(a2) are derived based on trigonometric relationships, ensuring a reasonable ratio between the bevel width, the thickness of the cover plate 2, and the included angle.

[0035] By setting minimum values ​​for h1 and h2, a sufficient width of the weld bevel is ensured, providing ample welding area. This guarantees weld strength and reliability, preventing weld fracture or other welding defects. A weld bevel width of at least 0.73t reduces welding defects caused by excessively narrow bevels, such as incomplete penetration and poor weld formation. A reasonable bevel width improves welding efficiency because welding material fills the bevel more easily, reducing welding time and material usage. Since the bevel width calculation formula includes the tangent of the included angle, the bevel width can be adjusted based on different included angles a1 and a2, making the design more flexible and adaptable to various welding requirements. A simplified calculation formula allows designers to quickly determine the bevel width, simplifying the design process. A sufficiently wide bevel width improves weld inspection accuracy because a wider bevel provides a larger detection area, enabling inspection methods such as ultrasonic testing to more effectively detect defects in the weld.

[0036] In some embodiments, such as Figure 1 and Figure 2 As shown, the first step surface 10211 and the second step surface 10221 are at the same height.

[0037] Maintaining the structural symmetry of the end cap assembly 100 by having the stepped surfaces at the same height is beneficial for maintaining the overall balance and stability of the assembly. The consistent height of the stepped surfaces reduces manufacturing complexity and improves production efficiency. Having the first stepped surface 10211 and the second stepped surface 10221 at the same height helps maintain consistency in the welding process. Welding parameters (such as current, voltage, and welding speed) can be more easily kept consistent on both stepped surfaces, thus improving weld quality. Consistent stepped surface height facilitates weld inspection. Inspection methods such as ultrasonic testing can be applied more evenly to both stepped surfaces, reducing variables in the inspection process. The consistent stepped surface height helps reduce errors caused by height differences during manufacturing, thereby improving the dimensional accuracy of the assembly. Consistent stepped surface height contributes to improved assembly performance in fuel transport systems. A uniform structure provides better mechanical properties and durability.

[0038] Optionally, the width of both the first step surface 10211 and the second step surface 10221 is 8mm-10mm. For example, the width of both the first step surface 10211 and the second step surface 10221 is 9mm.

[0039] In some embodiments, the cover plate 2 has a top surface 203 and a bottom surface 204, the bottom surface 204 abutting against the first step surface 10211 and the second step surface 10221, and the top surface 203 being flush with the first end surface 101.

[0040] The close contact between the bottom surface 204 of the cover plate 2 and the stepped surface helps improve the sealing performance of the end cap assembly 100 and prevent fuel leakage. The contact between the bottom surface 204 of the cover plate 2 and the stepped surface increases the stability of the assembly, helping it withstand the pressure and vibration that may occur during fuel transport. The top surface 203 of the cover plate 2 is flush with the first end face 101, which helps maintain the overall appearance consistency of the end cap assembly 100 and may also facilitate compatibility with other components.

[0041] In some embodiments, a protrusion 2031 is provided on the top surface 203, and the projection of the protrusion 2031 is located within the projection of the flow channel groove 102 in the projection plane parallel to the first end surface 101.

[0042] It should be noted that the protrusion 2031 is used by the end cap assembly 100 to realize other functions. By placing the projection of the protrusion 2031 in the projection plane parallel to the first end face 101 within the projection of the flow channel groove 102, interference of the protrusion 2031 during ultrasonic testing can be avoided, which would prevent normal ultrasonic testing from being performed and thus improve the reliability of operation.

[0043] The combustion chamber of this invention includes the end cap assembly 100 in any of the above embodiments.

[0044] The gas turbine of this invention includes the end cap assembly 100 in any of the above embodiments.

[0045] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An end cap assembly, characterized in that, include: End cap (1), the end cap (1) has a first end face (101), the first end face (101) is provided with a flow channel groove (102), the flow channel groove (102) has a first side wall (1021) and a second side wall (1022) opposite to each other, the first side wall (1021) includes a first step surface (10211) and a first welding surface (10212), the first step surface (10211) is parallel to the first end face (101), the first welding surface (10212) intersects the first end face (101) and the first step surface (10211) respectively, the second side wall (1022) includes a second step surface (10221) and a second welding surface, the second step surface (10221) is parallel to the first end face (101), the second welding surface intersects the first end face (101) and the second step surface (10221) respectively; A cover plate (2) is provided on the first step surface (10211) and the second step surface (10221). The cover plate (2) has opposing third welding surfaces (201) and fourth welding surfaces (202). A first welding bevel is defined between the third welding surface (201) and the first welding surface (10212), and a second welding bevel is defined between the fourth welding surface (202) and the second welding surface. The width of the first step surface (10211) is greater than or equal to the width of the first welding bevel, and the width of the second step surface (10221) is greater than or equal to the width of the second welding bevel.

2. The end cap assembly according to claim 1, characterized in that, Both the first welding surface (10212) and the third welding surface (201) are inclined surfaces, and the first welding bevel is V-shaped; and / or Both the second welding surface and the fourth welding surface (202) are inclined surfaces, and the second welding bevel is V-shaped.

3. The end cap assembly according to claim 2, characterized in that, The included angles between the first welding surface (10212) and the third welding surface (201) and the first end face (101) are both a1, where a1 is greater than or equal to 70°; and / or the included angles between the second welding surface and the fourth welding surface (202) and the first end face (101) are both a2, where a2 is greater than or equal to 70°.

4. The end cap assembly according to claim 3, characterized in that, The thickness of the cover plate (2) is t, and the width of the first welding bevel is h1, where h1 = ≥0.73t; and / or the width of the second weld bevel is h2, where h2 = ≥0.73t.

5. The end cap assembly according to claim 1, characterized in that, The first step surface (10211) and the second step surface (10221) are at the same height.

6. The end cap assembly according to claim 5, characterized in that, The width of both the first step surface (10211) and the second step surface (10221) is 8mm-10mm.

7. The end cap assembly according to claim 1, characterized in that, The cover plate (2) has a top surface (203) and a bottom surface (204), the bottom surface (204) abuts against the first step surface (10211) and the second step surface (10221), and the top surface (203) is flush with the first end surface (101).

8. The end cap assembly according to claim 7, characterized in that, The top surface (203) is provided with a protrusion (2031), and the projection of the protrusion (2031) is located in the projection of the flow channel groove (102) in a projection plane parallel to the first end surface (101).

9. A combustion chamber, characterized in that, The end cap assembly includes any one of claims 1-8.

10. A gas turbine, characterized in that, Includes the end cap assembly as described in claim 9.

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