Seal assemblies, turbines and gas turbines

Abstract

The present invention provides a sealing assembly, a turbine and a gas turbine, wherein the sealing assembly includes a first mounting member, a second mounting member and a tooth plate assembly, wherein the first mounting member and the second mounting member are arranged at intervals in a first direction, and an airflow gap is formed between the first mounting member and the second mounting member, wherein the first end of the first mounting member and the first end of the second mounting member form an air inlet connected to the airflow gap, and the second end of the first mounting member and the second end of the second mounting member form an air outlet connected to the airflow gap, and the tooth plate assembly includes a first tooth plate and a second tooth plate located in the airflow gap, wherein the first tooth plate extends from the first mounting member toward the second mounting plate and is arranged obliquely toward the air inlet, and the second tooth plate includes a first section and a second section, wherein the first section extends from the second mounting plate toward the first mounting plate and is arranged obliquely toward the air outlet, and the second section is connected to the free end of the first section, and the second section extends toward the air inlet. The sealing assembly of the present invention has the advantage of good sealing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and in particular to a sealing assembly, a turbine and a gas turbine. Background Art

[0002] During the operation of heavy-duty gas turbines, in order to ensure a good working environment for the hot end components and ensure their own safety and service life, relatively lower temperature cooling air will be extracted from the compressor end to cool the hot end components. In order to ensure the supply pressure and flow of the cooling air, a sealing component will be set at the static handover position of the turbine side of the gas turbine to prevent excessive leakage of cooling air into the mainstream, ensuring the power and efficiency of the whole machine while ensuring the supply pressure and flow of the hot end components.

[0003] The honeycomb structure used in the related technology has an airflow direction that can enter the interior of the honeycomb perpendicular to the wall of the honeycomb structure. However, since the honeycomb seal is mainly composed of thin metal sheets, two adjacent thin metal sheets are welded to form a regular hexagonal honeycomb sealing assembly, which reduces the airflow rate entering the honeycomb, thereby resulting in low sealing efficiency. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a sealing assembly that can use a tooth plate assembly to form multiple vortices on the flow path of the airflow when the airflow passes through the airflow gap, thereby preventing the leakage of the airflow and having the advantage of good sealing effect.

[0006] The embodiment of the present invention provides a turbine having the advantages of good sealing effect, small leakage and high overall machine efficiency.

[0007] The embodiment of the present invention provides a gas turbine, the turbine of which has the advantages of good sealing effect, small leakage and high overall machine efficiency.

[0008] The sealing assembly of the embodiment of the present invention comprises:

[0009] A first mounting member and a second mounting member, wherein the first mounting member and the second mounting member are spaced apart in a first direction, and an airflow gap is formed between the first mounting member and the second mounting member, a first end of the first mounting member and a first end of the second mounting member form an air inlet communicating with the airflow gap, and a second end of the first mounting member and a second end of the second mounting member form an air outlet communicating with the airflow gap, so that airflow enters the airflow gap from the air inlet and is discharged from the air outlet;

[0010] A tooth plate assembly, the tooth plate assembly comprising a first tooth plate and a second tooth plate located in the airflow gap, the first tooth plate extending from the first mounting member toward the second mounting plate and arranged obliquely toward the air inlet, the first tooth plate and the second tooth plate being arranged at intervals in a second direction, the first direction being orthogonal to the second direction,

[0011] The second tooth plate includes a first section and a second section, the first section extending from the second mounting plate toward the first mounting plate and arranged obliquely toward the air outlet, the second section being connected to a free end of the first section, and the second section extending toward the air inlet in the second direction,

[0012] There are a plurality of tooth plate assemblies, and the plurality of tooth plate assemblies are arranged at intervals along the second direction.

[0013] The sealing assembly of the embodiment of the present invention can form multiple vortices on the flow path of the airflow by using the tooth plate assembly when the airflow passes through the airflow gap, thereby preventing leakage of the airflow and having the advantage of good sealing effect.

[0014] In some embodiments, an angle formed between an extension direction of the first tooth plate and a surface of the first mounting member adjacent to the second mounting member is greater than or equal to 45 degrees and less than or equal to 75 degrees.

[0015] In some embodiments, the first tooth plate includes a third section and a fourth section connected in sequence in its extension direction, the third section is connected to the first mounting member, and the cross-sectional area of ​​the fourth section gradually decreases.

[0016] In some embodiments, a dimension between the free end of the first tooth plate and the first mounting member in the first direction is greater than or equal to a dimension between the second section and the first mounting member in the first direction.

[0017] In some embodiments, an angle formed between an extension direction of the first segment and a surface of the second mounting member adjacent to the first mounting member is greater than or equal to 45 degrees and less than or equal to 75 degrees.

[0018] A turbine according to an embodiment of the present invention comprises a casing, stationary blades, a sealing ring and a sealing assembly according to any one of the above embodiments, wherein the stationary blades are arranged on the inner circumference of the casing and are in plurality, and the plurality of stationary blades form a stationary blade group, the turbine has an annular sealing groove, the annular sealing groove is arranged on the outer circumference of the rotor of the turbine and corresponds to a stationary blade group, the sealing ring is arranged in the annular sealing groove, a first cooling gap is formed between the sealing ring and the annular sealing groove, the sealing assembly is arranged in the first cooling gap, the first mounting member is connected to the sealing groove, the second mounting member is connected to the sealing member, and the second direction is parallel to the axial direction of the rotor of the turbine.

[0019] In some embodiments, it also includes moving blades, wherein there are multiple moving blades, and the multiple moving blades form a moving blade group, and a second cooling gap is formed between the blade top of the moving blade group and the casing of the turbine, the sealing assembly is arranged in the second cooling gap, and the first mounting member is connected to the blade top of the moving blade group, and the second mounting member is connected to the turbine.

[0020] A turbine according to an embodiment of the present invention comprises a casing, moving blades and a sealing assembly according to any one of the above embodiments, wherein there are a plurality of moving blades, and the plurality of moving blades form a moving blade group, a second cooling gap is formed between the blade tops of the moving blade group and the casing, the sealing assembly is arranged in the second cooling gap, the first mounting member is connected to the blade tops of the moving blade group, and the second mounting member is connected to the casing.

[0021] In some embodiments, the second mounting member is a part of the housing, the sealing assembly further comprises a sealing plate, the mounting plate is disposed in the airflow gap and connected to the second mounting member, and the first section is connected to the mounting plate.

[0022] A gas turbine according to an embodiment of the present invention comprises a turbine, wherein the turbine comprises the turbine according to any one of the above-mentioned embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the structure of the sealing assembly according to the embodiment of the present invention.

[0024] Figure 2 yes Figure 1 An enlarged schematic diagram of A is shown in FIG.

[0025] Reference numerals:

[0026] Airflow direction 100;

[0027] A first mounting member 11;

[0028] A second mounting member 12;

[0029] Air flow gap 13; air inlet 131; air outlet 132;

[0030] First tooth plate 41; third section 411; fourth section 412;

[0031] The second tooth plate 42; the first section 421; the second section 422;

[0032] Mounting plate 5. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0034] The following describes a sealing assembly according to an embodiment of the present invention.

[0035] like Figure 1 and Figure 2 As shown, the sealing assembly of the embodiment of the present invention includes: a first mounting member 11, a second mounting member 12 and a tooth plate assembly.

[0036] The first mounting member 11 and the second mounting member 11 are arranged in a first direction (eg Figure 1 The first mounting member 11 and the second mounting member 12 are arranged at intervals in the up-down direction, and an airflow gap 13 is formed between the first mounting member 11 and the second mounting member 12, a first end of the first mounting member 11 (i.e. the left end of the first mounting member 11) and a first end of the second mounting member 12 (i.e. the left end of the second mounting member 12) form an air inlet 131 connected to the airflow gap 13, and a second end of the first mounting member 11 (i.e. the right end of the first mounting member 11) and a second end of the second mounting member 12 (i.e. the right end of the second mounting member 12) form an air outlet 132 connected to the airflow gap 13, so that air flows from the air inlet 131 into the airflow gap 13 and is discharged from the air outlet 132.

[0037] Specifically, Figure 1 As shown, the first mounting member 11 is arranged below the second mounting member 12, the air flow gap 13 is arranged in the left and right directions, the air inlet 131 is formed at the left end of the first mounting member 11 and the second mounting member 12, and the air outlet 132 is formed at the right end of the first mounting member 11 and the second mounting member 12, and the air flow can pass through the air inlet 131, the air flow gap 13, and the air outlet 132 in sequence from left to right.

[0038] The tooth plate assembly includes a first tooth plate 41 and a second tooth plate 42 located in the air flow gap 13. The first tooth plate 41 extends from the first mounting member 11 toward the second mounting plate 5 and is arranged obliquely toward the air inlet 131. The first tooth plate 41 and the second tooth plate 42 are arranged in a second direction (such as Figure 1 The first direction is orthogonal to the second direction.

[0039] The second tooth plate 42 includes a first section 421 and a second section 422. The first section 421 extends from the second mounting plate 5 toward the first mounting plate 5 and is arranged obliquely toward the air outlet 132. The second section 422 is connected to the free end of the first section 421, and the second section 422 extends toward the air inlet 131 in the second direction. There are multiple tooth plate assemblies, and the multiple tooth plate assemblies are arranged at intervals along the second direction.

[0040] Specifically, Figure 1As shown, the lower end of the first tooth plate 41 is connected to the first mounting member 11, and the first tooth plate 41 is arranged obliquely toward the air inlet 131, the upper end of the second tooth plate 42 is connected to the second mounting member 12, and the second tooth plate 42 is arranged obliquely toward the air outlet 132, there is a gap between the second tooth plate 42 and another tooth plate, and the second tooth plate 42 is located on the right side of the first tooth plate 41.

[0041] It is understandable that if Figure 1 As shown, after the airflow enters the airflow gap 13 from the air inlet 131, the airflow forms a first vortex in the first area due to the obstruction of the first tooth plate 41. After the subsequent airflow continues to flow into the air inlet 131, it is affected by the first vortex and can form a second vortex in the second area. The airflow continues to flow toward the air outlet 132, and is affected by the second tooth plate 42 to form a third vortex in the third area.

[0042] Therefore, in the airflow gap 13, the first vortex, the second vortex and the third vortex can be formed on the left side of each tooth plate assembly, thereby greatly hindering the flow rate of the airflow, reducing the leakage of the airflow, and improving the sealing performance of the sealing assembly of the embodiment of the present invention.

[0043] Therefore, the sealing assembly of the embodiment of the present invention has the advantage of good sealing effect.

[0044] In some embodiments, an angle formed between an extending direction of the first tooth plate 41 and a surface of the first mounting member 11 adjacent to the second mounting member 12 is greater than or equal to 45 degrees and less than or equal to 75 degrees.

[0045] Specifically, Figure 2 As shown, in a plane orthogonal to the first direction and the second direction, the angle formed between the extension direction of the first tooth plate 41 and the upper surface of the first mounting member 11 is α, and 45°≤α≤75°.

[0046] In some embodiments, the first tooth plate 41 includes a third section 411 and a fourth section 412 connected in sequence in its extension direction, the third section 411 is connected to the first mounting member 11, and the cross-sectional area of ​​the fourth section 412 gradually decreases.

[0047] Specifically, Figure 1 As shown, in a plane orthogonal to the first direction and the second direction, the width dimension (ie, the dimension in the left-right direction) of the fourth segment 412 gradually decreases.

[0048] It can be understood that the width of the fourth section 412 is significantly smaller than the width of the third section 411 , which can further increase the airflow loss.

[0049] In some embodiments, the dimension between the free end of the first tooth plate 41 and the first mounting member 11 in the first direction is greater than or equal to the dimension between the second section 422 and the first mounting member 11 in the first direction.

[0050] Specifically, Figure 2 As shown, the distance from the free end of the first tooth plate 41 to the first mounting member 11 is H1, and the distance between the second section 422 and the first mounting member 11 is H2, and H1 is greater than or equal to H2.

[0051] It can be understood that the free end of the first tooth plate 41 is arranged flush with the second section 422 in the up and down direction, or the free end of the first tooth plate 41 is arranged higher than the second section 422 in the up and down direction, so as to prevent the airflow from directly passing through the gap between the first tooth plate 41 and the second tooth plate 42, and ensure that the airflow can generate the first vortex, the second vortex and the third vortex in the airflow gap 13.

[0052] In some embodiments, an angle formed between an extending direction of the first section 421 and a surface of the second mounting member 12 adjacent to the first mounting member 11 is greater than or equal to 45 degrees and less than or equal to 75 degrees.

[0053] Specifically, Figure 2 As shown, in a plane orthogonal to the first direction and the second direction, the angle formed between the extension direction of the first section 421 and the lower surface of the second mounting member 12 is β, and 45°≤β≤75°.

[0054] A turbine according to an embodiment of the present invention will be described below.

[0055] The turbine of the embodiment of the present invention includes a casing, stationary blades, a sealing ring and a sealing assembly according to any one of the above embodiments, the stationary blades are arranged on the inner circumference of the casing and are in plurality, the plurality of stationary blades forming a stationary blade group, the turbine having an annular sealing groove, the annular sealing groove being arranged on the outer circumference of the rotor of the turbine and corresponding to a stationary blade group, the sealing ring being arranged in the annular sealing groove, a first cooling gap being formed between the sealing ring and the annular sealing groove, the sealing assembly being arranged in the first cooling gap, the first mounting member 11 being connected to the sealing groove, the second mounting member 12 being connected to the sealing member, and the second direction being parallel to the axial direction of the rotor of the turbine.

[0056] In some embodiments, the turbine of the embodiment of the present invention also includes moving blades, there are multiple moving blades, the multiple moving blades form a moving blade group, a second cooling gap is formed between the blade top of the moving blade group and the casing of the turbine, the sealing assembly is arranged in the second cooling gap, and the first mounting member 11 is connected to the blade top of the moving blade group, and the second mounting member 12 is connected to the turbine.

[0057] The inventors found that during the operation of the turbine, the leakage airflow in the turbine can flow from the stationary blade group and through the first cooling gap to the direction of the moving blades, and the flow rate of the leakage airflow will affect the operation of the moving blades, thereby affecting the work and efficiency of the turbine. Therefore, placing the sealing component in the first cooling gap can hinder the flow rate of the leakage airflow, reduce the leakage flow rate of the leakage airflow, and thereby improve the work and efficiency of the turbine.

[0058] It can be understood that the leakage flow path near the sealing ring is in parallel with the air supply flow path of the moving blade group. Therefore, by using the sealing component disposed in the first sealing gap, the leakage flow rate can be reduced, which helps to ensure the air supply pressure and flow rate of the moving blade group. Preferably, a sealing component is disposed between the blade tip of the moving blade group and the casing of the turbine, which can further reduce the leakage flow rate at the blade tip position of the moving blade group, thereby further improving the work and efficiency of the turbine.

[0059] Next, a turbine according to another embodiment of the present invention will be described.

[0060] A turbine in another embodiment of the present invention includes a casing, moving blades and a sealing assembly according to any one of the above embodiments, there are multiple moving blades, the multiple moving blades form a moving blade group, a second cooling gap is formed between the blade tops of the moving blade group and the casing, the sealing assembly is arranged in the second cooling gap, and the first mounting member 11 is connected to the blade tops of the moving blade group, and the second mounting member 12 is connected to the casing.

[0061] It is understandable that, depending on the different models of turbines, a sealing assembly may be disposed between the blade tips of the moving blade group and the casing of the turbine to reduce the leakage flow between the blade tips of the moving blade group and the casing of the turbine.

[0062] Of course, according to the actual operating conditions of the turbine, the sealing assembly can also be arranged only between the sealing ring and the annular sealing groove.

[0063] In some embodiments, the second mounting member 12 is a part of the housing, the sealing assembly further includes a sealing plate, the mounting plate 5 is disposed in the airflow gap 13 and connected to the second mounting member 12 , and the first section 421 is connected to the mounting plate 5 .

[0064] It is understandable that when the seal is disposed between the blade tip of the moving blade set and the casing of the turbine, a portion of the seal can be used as the second mounting member 12. The mounting plate 5 can be disposed on the casing of the turbine, and the first section 421 of the second tooth plate 42 is connected to the mounting plate 5.

[0065] That is to say, when a part of the turbine housing is used as the second mounting member 12, the second tooth plate 42 can be first mounted on the mounting plate 5, and then the mounting plate 5 can be connected to the turbine housing to reduce the construction difficulty.

[0066] A gas turbine according to an embodiment of the present invention includes a turbine, and the turbine includes the turbine according to any one of the above embodiments.

[0067] It can be understood that the turbine of the gas turbine in the embodiment of the present invention is provided with a sealing assembly between the sealing ring and the sealing ring groove of the adjacent stationary blade group, or a sealing assembly is provided between the blade tip of the moving blade group and the casing of the turbine, or a sealing assembly is provided between the sealing ring and the sealing ring groove of the adjacent stationary blade group and between the blade tip of the moving blade group and the casing of the turbine, which can reduce the flow rate of the overall leakage gas of the turbine, thereby improving the work and efficiency of the turbine. Therefore, the gas turbine in the embodiment of the present invention has the advantages of good sealing effect, small leakage and high overall machine efficiency.

[0068] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0072] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction 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 described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0073] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A sealing assembly, characterized in that: include: A first mounting member and a second mounting member, wherein the first mounting member and the second mounting member are spaced apart in a first direction, and an airflow gap is formed between the first mounting member and the second mounting member, a first end of the first mounting member and a first end of the second mounting member form an air inlet communicating with the airflow gap, and a second end of the first mounting member and a second end of the second mounting member form an air outlet communicating with the airflow gap, so that airflow enters the airflow gap from the air inlet and is discharged from the air outlet; A tooth plate assembly, the tooth plate assembly comprising a first tooth plate and a second tooth plate located in the airflow gap, the first tooth plate extending from the first mounting member toward the second mounting member and arranged obliquely toward the air inlet, the first tooth plate and the second tooth plate being arranged at intervals in a second direction, the first direction being orthogonal to the second direction, The second tooth plate includes a first section and a second section, the first section extends from the second mounting member toward the first mounting member and is arranged obliquely toward the air outlet, the second section is connected to a free end of the first section, and the second section extends toward the air inlet in the second direction, There are a plurality of tooth plate assemblies, and the plurality of tooth plate assemblies are arranged at intervals along the second direction.

2. The sealing assembly according to claim 1, characterized in that: An angle formed between an extending direction of the first tooth plate and a surface of the first mounting member adjacent to the second mounting member is greater than or equal to 45 degrees and less than or equal to 75 degrees.

3. The sealing assembly according to claim 2, characterized in that: The first tooth plate includes a third section and a fourth section which are sequentially connected in the extending direction thereof, the third section is connected to the first mounting member, and the cross-sectional area of ​​the fourth section gradually decreases.

4. The sealing assembly according to claim 1, characterized in that: A dimension between the free end of the first tooth plate and the first mounting member in the first direction is greater than or equal to a dimension between the second section and the first mounting member in the first direction.

5. The sealing assembly according to claim 4, characterized in that: An angle formed between an extending direction of the first section and a surface of the second mounting member adjacent to the first mounting member is greater than or equal to 45 degrees and less than or equal to 75 degrees.

6. A turbine, characterized in that: The turbine includes a casing, stationary blades, a sealing ring and a sealing assembly according to any one of claims 1 to 5, wherein the stationary blades are arranged on the inner circumference of the casing and are in plurality, and the plurality of stationary blades form a stationary blade group, the turbine has an annular sealing groove, the annular sealing groove is arranged on the outer circumference of the turbine rotor and corresponds to a stationary blade group, the sealing ring is arranged in the annular sealing groove, a first cooling gap is formed between the sealing ring and the annular sealing groove, the sealing assembly is arranged in the first cooling gap, the first mounting member is connected to the sealing groove, the second mounting member is connected to the sealing assembly, and the second direction is parallel to the axial direction of the turbine rotor.

7. The turbine according to claim 6, characterized in that It also includes moving blades, which are in plurality and form a moving blade group. A second cooling gap is formed between the blade top of the moving blade group and the casing of the turbine. The sealing assembly is arranged in the second cooling gap, and the first mounting member is connected to the blade top of the moving blade group, and the second mounting member is connected to the turbine.

8. The turbine according to any one of claims 6 to 7, characterized in that The second mounting member is a part of the housing. The sealing assembly further comprises a sealing plate, which is disposed in the airflow gap and connected to the second mounting member. The first section is connected to the sealing plate.

9. A turbine, characterized in that: The turbine includes a casing, moving blades and a sealing assembly according to any one of claims 1 to 5, wherein there are a plurality of moving blades, and the plurality of moving blades form a moving blade group, and a second cooling gap is formed between the blade tops of the moving blade group and the casing, and the sealing assembly is arranged in the second cooling gap, and the first mounting member is connected to the blade tops of the moving blade group, and the second mounting member is connected to the casing.

10. A gas turbine, characterized in that: Comprising a turbine, the turbine comprising the turbine according to any one of claims 6-9.

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