Gas turbine cylinder

Abstract

The gas turbine air cylinder comprises a first air cylinder part and a second air cylinder part, the first air cylinder part comprises a first connecting face and a boss, and the second air cylinder part comprises a second connecting face, a sealing groove and a sealing medium; the boss is located on the first connecting face, the sealing groove is located on the second connecting face, the sealing medium is located in the sealing groove, and when the first air cylinder part is connected with the second air cylinder part, at least part of the boss can be inserted into the sealing medium. Good airtightness of the gas turbine cylinder can be achieved by applying the gas turbine cylinder sealing structure; an existing sealing ring structure can be replaced, universality is high, and machining cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and specifically, to a gas turbine cylinder. Background Art

[0002] The inside of a gas turbine cylinder is filled with high-temperature and high-pressure gas. The cylinder is connected by the bolt tightening force of the split plane to seal the gas inside the cylinder. However, usually due to reasons such as the transient temperature deformation of the cylinder, the circumferential temperature difference of the cylinder, insufficient bolt tightening force of the split plane, and large internal and external pressure differences, the cylinder will have openings as shown in Figure 1-2 . The gas inside the cylinder body will leak to the outside of the cylinder along the opening gap. The leakage of high-temperature gas will not only reduce the efficiency of the gas turbine, but also pose a great safety risk. For the technical problem of air leakage at the split plane, as shown in Figure 3-4 , a sealing groove is designed on the split plane, and a sealing ring (such as: C-shaped sealing ring, E-shaped sealing ring, etc.) is installed in the sealing groove. The elastic property of the sealing ring ensures that the air sealing ring is closely attached to the split planes of the upper and lower cylinders, thereby playing a sealing role.

[0003] For the existing technical solutions, adopting the sealing ring structure, there are mainly the following problems:

[0004] 1. The sealing ring is a customized product with poor versatility. Changes in the material of the flange, gas pressure, and contact stress of the split plane all require re-designing the sealing ring;

[0005] 2. Due to the special-shaped structure of the sealing ring, it is difficult to process and form the sealing ring, and the processing difficulty is relatively large. Only a few companies globally have the processing ability;

[0006] 3. During the working process of the sealing ring, it is necessary to maintain lasting elasticity, temperature, and material adaptability. Therefore, the material requirements are relatively special, and usually, treatments such as gold plating are required;

[0007] 4. The service life of the sealing ring is relatively low. During the operation of the gas turbine, it is necessary to regularly replace the sealing ring for maintenance;

[0008] 5. Due to the customization, large processing difficulty, material particularity, and low service life of the sealing ring, the cost is relatively high.

[0009] In the prior art, as proposed in CN204627679U, a horizontal split surface sealing structure for a turbine cylinder is provided at the connection between the upper half and the lower half of the turbine cylinder. It includes a sealing block, a first groove provided on the upper half of the turbine cylinder, and a second groove provided on the lower half of the turbine cylinder and matching the first groove. The first groove and the second groove form a mounting groove, and the sealing block is arranged in the mounting groove. The horizontal split surface sealing structure of the turbine cylinder provided by this technical solution solves the problems of complex structure and inconvenient disassembly and assembly existing in the horizontal split surface sealing structure of industrial gas turbine cylinders in the prior art.

[0010] However, none of the prior art solutions can completely solve the above problems. Summary of the Invention

[0011] The object of the present invention is to solve the above technical problems.

[0012] To achieve the above object, the first aspect of the present invention proposes a gas turbine cylinder, which includes a first cylinder part and a second cylinder part. The first cylinder part includes a first connection surface and a convex platform, and the second cylinder part includes a second connection surface, a sealing groove, and a sealing medium. The convex platform is located on the first connection surface, the sealing groove is located on the second connection surface, the sealing medium is located inside the sealing groove. When the first cylinder part is connected to the second cylinder part, at least part of the convex platform can be inserted into the inside of the sealing medium.

[0013] Further, the sealing medium is a metal with a melting point higher than 400 degrees Celsius and lower than 900 degrees Celsius.

[0014] Further, it further includes a plurality of heating elements, and the plurality of heating elements are all arranged at positions in contact with the sealing medium.

[0015] Further, the plurality of heating elements are respectively arranged on the top of the convex platform and the inner wall surface of the sealing groove.

[0016] Further, the heating element is a heating tape.

[0017] Further, both the convex platform and the sealing groove extend along the axial direction of the cylinder.

[0018] Further, the convex platform includes an inner side surface and an outer side surface. The inner side surface is closer to the inner side of the cylinder than the outer side surface, and the inner side surface is higher than the outer side surface.

[0019] Further, the top of the convex platform includes at least two surfaces. The top of the inner side surface and the top of the outer side surface are connected by at least two surfaces. The angle between the surface directly connecting the top of the convex platform and the inner side surface and the inner side surface is between 20 degrees and 70 degrees.

[0020] Furthermore, at least one of the heating elements is provided on the top surface of each of the bosses.

[0021] Furthermore, the sealing groove includes a plurality of fixing grooves provided on the inner wall of the sealing groove. The sealing medium can enter the interior of the fixing grooves, and the fixing grooves extend along the axial direction of the cylinder.

[0022] Furthermore, the width of the bottom surface of the fixing groove is greater than the width of the opening of the fixing groove.

[0023] Furthermore, the heating element is located on the bottom surface of the sealing groove.

[0024] Furthermore, the sealing groove includes three inner wall surfaces extending along the axial direction of the cylinder, and one of the inner wall surfaces is the bottom surface of the sealing groove.

[0025] Furthermore, it includes three fixing grooves, and the three fixing grooves are located on the three inner wall surfaces of the sealing groove.

[0026] Furthermore, it includes four heating elements, two of the heating elements are provided on the top surface of the boss, and the other two heating elements are provided on the bottom surface of the sealing groove.

[0027] Furthermore, the first cylinder part is the upper half of the cylinder, the second cylinder part is the lower half of the cylinder, the first connection surface and the second connection surface are the contact surfaces when the first cylinder part is connected to the second cylinder part, and both the first connection surface and the second connection surface coincide with the middle dividing surface of the cylinder.

[0028] Furthermore, the first cylinder part and the second cylinder part are fixedly connected by a flange, and both the first connection surface and the second connection surface are the sealing surfaces of the flange.

[0029] Applying the above technical solutions of the present invention, at least the following technical effects are achieved:

[0030] 1. By pouring metal into the sealing groove in the present invention and utilizing the hardness difference of the metal, good airtightness is achieved through pressing; it can replace the existing sealing ring structure, has strong versatility, low processing cost, and solves the problems of poor versatility, difficult processing, and special materials of the current sealing ring.

[0031] 2. Through the heating belt in the sealing groove in the present invention, the poured metal can be quickly heated and liquefied to restore the original shape of the poured metal, and it can be continuously used throughout the service life cycle of the gas turbine. Compared with the traditional sealing ring structure, the durability is improved.

[0032] 3. By designing fixing grooves on the bottom surface and side surface of the sealing groove in the present invention, the adhesion between the poured metal and the sealing groove is increased, and the sealing effect of the cylinder is improved.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0035] Figure 1 A schematic diagram of air leakage of a cylinder in the background art is shown;

[0036] Figure 2 An A-A cross-sectional view of a cylinder in the background art is shown;

[0037] Figure 3 A schematic diagram of the seal structure of a cylinder in the background art is shown;

[0038] Figure 4 A B-B cross-sectional view of the seal structure of a cylinder in the background art is shown;

[0039] Figure 5 A schematic diagram of the sealing structure of a cylinder in an embodiment is shown;

[0040] Figure 6 An enlarged view of Figure 5 "A" in

[0041] Figure 7 An installation diagram of the sealing structure of a cylinder in an embodiment is shown;

[0042] Figure 8 An enlarged view of Figure 7 "B" in

[0043] Figure 9 A schematic diagram of the operating principle of the sealing structure of a cylinder in an embodiment is shown;

[0044] Figure 10 An enlarged view of Figure 9 "C" in

[0045] Reference numerals: 1, first cylinder part; 11, first connection surface; 12, boss; 2, second cylinder part; 21, second connection surface; 22, sealing groove; 23, sealing medium; 24, fixing groove; 3, heating element. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0047] The present invention will be further described in detail below in conjunction with specific embodiments, which should not be construed as limiting the scope of the present invention claimed.

[0048] Embodiment 1

[0049] According to one aspect of the present invention, a gas turbine cylinder is provided, which includes a first cylinder part 1 and a second cylinder part 2. The first cylinder part 1 includes a first connection surface 11 and a boss 12, and the second cylinder part 2 includes a second connection surface 21, a sealing groove 22 and a sealing medium 23. The boss 12 is located on the first connection surface 11, the sealing groove 22 is located on the second connection surface 21, the sealing medium 23 is located inside the sealing groove 22. When the first cylinder part 1 is connected to the second cylinder part 2, at least part of the boss 12 can be inserted into the sealing medium 23.

[0050] Specifically, as Figure 5-10 shown, the sealing medium 23 is located inside the sealing groove 22, the boss 12 squeezes and enters the sealing medium 23, and the sealing medium 23 is tightly combined with the boss 12, which can effectively prevent the gas inside the cylinder from flowing out through the gap between the first cylinder part 1 and the second cylinder part 2.

[0051] Applying the above technical solution of the present invention, at least the following technical effects are achieved:

[0052] In the present invention, by pouring metal into the sealing groove and utilizing the hardness difference of the metal, good airtightness is achieved through pressing; it can replace the existing sealing ring structure, has strong versatility and low processing cost, and solves the problems of poor versatility, difficult processing and special materials of the current sealing ring.

[0053] Embodiment 2

[0054] According to an aspect of the present invention, a gas turbine cylinder is provided, which is characterized in that it includes a first cylinder part 1 and a second cylinder part 2. The first cylinder part 1 includes a first connection surface 11 and a boss 12. The second cylinder part 2 includes a second connection surface 21, a sealing groove 22 and a sealing medium 23. The boss 12 is located on the first connection surface 11. The sealing groove 22 is located on the second connection surface 21. The sealing medium 23 is located inside the sealing groove 22. When the first cylinder part 1 is connected to the second cylinder part 2, at least a part of the boss 12 can be inserted into the inside of the sealing medium 23. The first cylinder part 1 is the upper half of the cylinder, and the second cylinder part 2 is the lower half of the cylinder. The first connection surface 11 and the second connection surface 21 are the contact surfaces when the first cylinder part 1 is connected to the second cylinder part 2. Both the first connection surface 11 and the second connection surface 21 coincide with the mid-plane of the cylinder. The first cylinder part 1 and the second cylinder part 2 are fixedly connected by a flange. Both the first connection surface 11 and the second connection surface 21 are the sealing surfaces of the flange.

[0055] Specifically, as Figure 5-10 shown, both the sealing groove 22 and the boss 12 are located on the sealing surface of the flange. The sealing medium 23 is located inside the sealing groove 22. The boss 12 squeezes and enters the inside of the sealing medium 23. The sealing medium 23 combines tightly with the boss 12, which can effectively prevent the gas inside the cylinder from flowing out through the gap between the first cylinder part 1 and the second cylinder part.

[0056] The sealing medium 23 is a metal with a melting point higher than 400 °C and lower than 900 °C. Specifically, the melting point of the sealing medium should be slightly higher than the highest operating temperature of the cylinder to ensure that the sealing medium is in a solid state during the normal operation of the gas turbine. When assembling the upper half and the lower half of the cylinder, the sealing medium is first poured into the sealing groove 22, and then the sealing medium 23 is cured at the installation temperature. More specifically, the sealing medium can be pure aluminum, pure zinc or silver-copper alloy (containing 80% silver and 20% copper), etc. When the highest operating temperature of the cylinder is lower than 400 °C, pure zinc (melting point 419 °C) is preferred. When the highest operating temperature of the cylinder is higher than 400 °C and lower than 600 °C, pure aluminum (melting point 660 °C) is preferred. When the highest operating temperature of the cylinder is higher than 600 °C, silver-copper alloy (melting point 814 °C) is preferred. By selecting the above-mentioned sealing medium, it can be ensured that the sealing medium does not melt under the working conditions, and the sealing medium can reach the molten state with a relatively small heating power of the heating belt.

[0057] The gas turbine cylinder further includes a plurality of heating elements 3, and the plurality of heating elements 3 are all arranged at positions in contact with the sealing medium 23. The plurality of heating elements 3 are respectively arranged at the top of the boss 12 and the inner wall surface of the sealing groove 22. The heating element 3 is a heating belt.

[0058] Specifically, as Figure 5-10 shown, the position in contact with the sealing medium 23 means that when the cylinder is in a non-operating state, the heating element 3 can contact the sealing medium, and at this position, the heating element 3 can melt the sealing medium. The position in contact with the sealing medium 23 can be inside the sealing medium 23 or at a position adjacent to the sealing medium. The heating element 3 heats and melts the contact surface to pour metal, and then stops heating. The interfacial metal solidifies, which can ensure the contact between the boss 12 and the sealing medium 23.

[0059] Both the boss 12 and the sealing groove 22 extend along the axial direction of the cylinder. The boss 12 includes an inner side surface and an outer side surface. The inner side surface is closer to the inner side of the cylinder than the outer side surface, and the inner side surface is higher than the outer side surface.

[0060] It should be noted that both the boss 12 and the sealing groove 22 extending along the axial direction of the cylinder means that the boss 12 and the sealing groove 22 as a whole extend along the axial direction of the cylinder, and may also include the boss 12 or the sealing groove 22 extending along the axial direction of the cylinder in a curved shape. The inner side surface being higher than the outer side surface means that the vertical distance from the top end of the inner side surface to the first connection surface 11 is greater than the vertical distance from the top end of the outer side surface to the first connection surface 11.

[0061] Specifically, as Figure 9-10 shown, both the boss 12 and the sealing groove 22 extend along the flange direction. Both the inner side surface and the outer side surface are side surfaces of the boss 12. The end face of the boss close to the inner side of the cylinder presses the sealing medium. When a gap appears in the cylinder (due to reasons such as transient temperature deformation of the cylinder, circumferential temperature difference of the cylinder, insufficient bolt tightening force at the split surface, and large internal and external pressure difference), an angle a will be formed between the boss 12 and the sealing groove 22. Therefore, the boss 12 will form a squeezing area with the sealing medium 23 on the inner side of the cylinder in the figure, ensuring that the gas in the cylinder cannot flow out of the gap to the outside of the cylinder.

[0062] The top end of the boss 12 includes at least two surfaces. The top end of the inner side surface and the top end of the outer side surface are connected by at least two surfaces. The angle between the surface directly connecting the top end of the boss 12 and the inner side surface and the inner side surface is between 20 degrees and 70 degrees. At least one heating element 3 is arranged on each surface of the top end of each boss 12. Specifically, as Figure 5-10As shown, the top of the inner side surface and the outer side surface of the boss 12 are connected by two surfaces, and a heating element 3 is provided on each of the two surfaces. The surface close to the inner side of the cylinder presses the sealing medium, which can improve the sealing effect of the gas turbine cylinder. The sealing groove 22 includes three inner wall surfaces extending along the axial direction of the cylinder, and one of the inner wall surfaces is the bottom surface of the sealing groove 22. The sealing groove 22 includes a plurality of fixing grooves 24, and the fixing grooves 24 are arranged on the inner wall of the sealing groove 22. The sealing medium 23 can enter the inside of the fixing grooves 24, and the fixing grooves 24 extend along the axial direction of the cylinder. The width of the bottom surface of the fixing groove 24 is greater than the width of the opening of the fixing groove 24. There are three fixing grooves 24, and the three fixing grooves 24 are located on the three inner wall surfaces of the sealing groove 22.

[0063] Specifically, as Figure 5-10 shown, the fixing groove 24 is a dovetail groove. The three fixing grooves are located on the three inner wall surfaces of the sealing groove 22, and the fixing groove 24 can increase the adhesion between the sealing medium 23 and the sealing groove 22.

[0064] The heating element 3 is located at the bottom surface of the sealing groove 22. There are four heating elements 3, two of the heating elements 3 are arranged on the top surface of the boss 12, and the other two heating elements 3 are arranged on the bottom surface of the sealing groove 22.

[0065] Specifically, the two heating elements 3 are respectively located on the two surfaces at the top of the boss 12, and the two heating elements 3 are arranged on the bottom surface of the sealing groove 22 and are respectively located on both sides of the bottom fixing groove 24.

[0066] As Figure 7-8 shown, due to the slight shaking during the installation process of the cylinder, a gap may be generated between the boss and the sealing medium. Therefore, after the cylinder is installed, the sealing medium can be heated and melted by the heating element 3 to make the boss 12 and the sealing medium 23 fully contact to ensure the sealing performance. Due to the opening, a small gap is generated between the top of the boss 12 and the sealing medium 23. The sealing medium 23 can be heated by the heating element 3 at the top of the boss 12 to melt the sealing medium 23 near the boss 12 to ensure the close contact between the boss 12 and the sealing medium 23. When the gas turbine of the unit cools down, the flange returns to the cooled state. At this time, the sealing medium 23 can be quickly heated and melted by the heating element 3 in the sealing groove 22 to make the contact surface between the boss 12 and the sealing medium 23 fully fuse again to ensure the sealing performance.

[0067] Applying the above technical solutions of the present invention, at least the following technical effects are achieved:

[0068] 1. The present invention realizes good airtightness by pouring metal into the sealing groove and using the hardness difference of the metal for pressing; it can replace the existing sealing ring structure, has strong versatility and low processing cost, and solves the problems of poor versatility, difficult processing, and special materials of the current sealing ring.

[0069] 2. Through the heating belt in the sealing groove, the present invention can quickly heat and liquefy the poured metal to restore the original shape of the poured metal, and can be continuously used throughout the life cycle of the gas turbine. Compared with the traditional sealing ring structure, the durability is improved.

[0070] 3. The present invention designs fixing grooves on the bottom surface and side surface of the sealing groove to increase the adhesion between the poured metal and the sealing groove, and improve the sealing effect of the cylinder.

[0071] The above are only multiple specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

[0072] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0073] It should be noted that in the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

Claims

1. A gas turbine cylinder, characterized in that, It includes a first cylinder part (1) and a second cylinder part (2). The first cylinder part (1) includes a first connection surface (11) and a boss (12). The second cylinder part (2) includes a second connection surface (21), a sealing groove (22) and a sealing medium (23). The boss (12) is located on the first connection surface (11). The sealing groove (22) is located on the second connection surface (21). The sealing medium (23) is located inside the sealing groove (22). When the first cylinder part (1) is connected to the second cylinder part (2), at least part of the boss (12) can be inserted into the inside of the sealing medium (23).

2. The gas turbine cylinder according to claim 1, characterized in that, The sealing medium (23) is a metal with a melting point higher than 400 degrees Celsius and lower than 900 degrees Celsius.

3. The gas turbine cylinder according to claim 2, wherein, It further includes a plurality of heating elements (3), and the plurality of heating elements (3) are all arranged at positions in contact with the sealing medium (23).

4. The gas turbine cylinder according to claim 3, wherein, The plurality of heating elements (3) are respectively arranged on the top end of the boss (12) and the inner wall surface of the sealing groove (22).

5. The gas turbine cylinder according to claim 4, characterized in that, The heating element (3) is a heating tape.

6. The gas turbine cylinder according to claim 5, characterized in that, Both the boss (12) and the sealing groove (22) extend along the axial direction of the cylinder.

7. The gas turbine cylinder according to claim 6, characterized in that, The boss (12) includes an inner side surface and an outer side surface. The inner side surface is closer to the inner side of the cylinder than the outer side surface, and the inner side surface is higher than the outer side surface.

8. The gas turbine cylinder according to claim 7, wherein, The top end of the boss (12) includes at least two surfaces. The top end of the inner side surface and the top end of the outer side surface are connected by at least two surfaces. The angle between the surface where the top end of the boss (12) is directly connected to the inner side surface and the inner side surface is between 20 degrees and 70 degrees.

9. The gas turbine cylinder according to claim 8, characterized in that, At least one heating element (3) is arranged on each surface of the top end of the boss (12).

10. The gas turbine cylinder according to claim 9, characterized in that, The sealing groove (22) includes a plurality of fixing grooves (24). The fixing grooves (24) are arranged on the inner wall of the sealing groove (22). The sealing medium (23) can enter the inside of the fixing grooves (24). The fixing grooves (24) extend along the axial direction of the cylinder.

11. The gas turbine cylinder according to claim 10, wherein The width of the bottom surface of the fixing groove (24) is greater than the width of the opening of the fixing groove (24).

12. The gas turbine cylinder according to claim 11, characterized in that, The heating element (3) is located on the bottom surface of the sealing groove (22).

13. The gas turbine cylinder according to claim 12, characterized in that, The sealing groove (22) includes three inner wall surfaces extending along the axial direction of the cylinder, and one of the inner wall surfaces is the bottom surface of the sealing groove (22).

14. The gas turbine cylinder according to claim 13, characterized in that, It includes three fixing grooves (24), and the three fixing grooves (24) are respectively located on the three inner wall surfaces of the sealing groove (22).

15. The gas turbine cylinder according to claim 14, wherein, It includes four heating elements (3), two of the heating elements (3) are arranged on the surfaces of the top end of the boss (12), and the other two heating elements (3) are arranged on the bottom surface of the sealing groove (22).

16. The gas turbine cylinder according to claim 15, characterized in that, The first cylinder part (1) is the upper half of the cylinder, the second cylinder part (2) is the lower half of the cylinder. The first connection surface (11) and the second connection surface (21) are the contact surfaces when the first cylinder part (1) is connected to the second cylinder part (2). The first connection surface (11) and the second connection surface (21) both coincide with the mid - plane of the cylinder.

17. The gas turbine cylinder according to any one of claims 1-16, characterized in that, The first cylinder part (1) and the second cylinder part (2) are fixedly connected by a flange, and both the first connection surface (11) and the second connection surface (21) are sealing surfaces of the flange.

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