A heat shield

Abstract

The present invention provides a heat shield, comprising: a heat shield for a gas turbine combustion chamber, characterized in that it comprises: a support member (1), a plurality of main shielding members (2) and a plurality of secondary shielding members (3), all of the main shielding members (2) are fixedly connected to the support member (1) through a fixing member (14), all of the main shielding members (2) are sequentially connected on the side facing the gas turbine combustion chamber to form a shielding portion, an open groove is provided between adjacent main shielding members (2) on the side facing the support member (1), the secondary shielding member (3) is provided in the open groove, one end of the fixing member (14) is fixed in the open groove, and the other end of the fixing member (14) is fixed on the support member (1). The heat shield is used to solve the problem that the heat shield of the gas turbine combustion chamber in the prior art cannot effectively insulate.

Description

Technical Field

[0001] The invention relates to a heat shielding device for a gas turbine, in particular to a heat shield for a combustion chamber of a gas turbine. Background Art

[0002] The combustion process in the gas turbine occurs in the combustion chamber casing. Since it works in a high-temperature environment, it is necessary to add refractory materials inside the casing for heat insulation. The refractory insulation layer (hereinafter referred to as the heat shield) is usually composed of multiple sheet tiles, which are arranged circumferentially around the axis of the rotor and completely cover the inner surface of the casing. The heat shield is fixed to the casing by a metal support member, and the support member is in contact with the side of the heat shield. In actual use, in order to ensure thermal expansion, there is a gap between adjacent heat shields, so that hot gas can invade and directly reach the end of the support member, causing the local area of ​​the support member to overheat and burn, and then fail. In particular, the support member is located in the middle and lower part of the gap between the heat shields. After the high-temperature gas enters the gap, it directly contacts the end of the support member, exposing the end of the support member to high temperature conditions, which is very easy to oxidize and may break and fail. In addition, the existence of the gap also causes the end of the support member to receive thermal radiation from the high-temperature gas. After a long time, it will cause thermal viscous creep and relaxation of the support member material, which will lead to failure in the fixed state.

[0003] Patent publication number CN1818527A proposes a heat shield on a supporting structure, in which the fixing part is designed with a cooling system, which can directly supply cooling fluid to the clamping section of the fixing part. However, this structure still cannot avoid the contact and heat radiation heat exchange between the clamping section of the fixing part and the high-temperature gas.

[0004] Patent publication number CN103518100A proposes a heat shielding device, in which the heat shield of the device is provided with overlapping inclined convex shoulder front edges and concave rear edges on both sides of the adjacent side walls. However, this structure cannot effectively prevent the intrusion of high-temperature gas when the gap between the heat shields is increased.

[0005] Therefore, a new structure is needed to solve the above problems. Summary of the invention

[0006] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a heat shield for solving the problem that the heat shield of the combustion chamber of a gas turbine in the prior art cannot effectively insulate.

[0007] To achieve the above-mentioned object and other related objects, the present invention provides a heat shield, comprising: a support member, a plurality of main shielding members and a plurality of auxiliary shielding members, all of the main shielding members are fixedly connected to the support member through a fixing member, all of the main shielding members are connected in sequence on a side facing a combustion chamber of a gas turbine to form a shielding portion, an open groove is provided between adjacent main shielding members on a side facing the support member, the auxiliary shielding member is provided in the open groove, one end of the fixing member is fixed in the open groove, and the other end of the fixing member is fixed to the support member.

[0008] Preferably, the support member has a cooling channel which penetrates the support member, the auxiliary shielding member is provided with cooling holes, the cooling channel is connected with all the cooling holes, and the hole ends of the cooling holes face the main shielding member.

[0009] Preferably, a sealing structure is provided between the auxiliary shielding member and the shielding portion, and the sealing structure is provided with a through hole corresponding to the cooling hole.

[0010] The sealing structure and the auxiliary shielding component are an integrated structure, and the sealing surface of the sealing structure is in a wave-breaking shape.

[0011] The sealing structure and the auxiliary shielding component are inlaid structures.

[0012] Preferably, the opening groove further comprises a limiting slot for limiting one end portion of the fixing member.

[0013] Preferably, the support member is provided with a positioning groove for limiting the other end portion of the fixing member.

[0014] Preferably, the main shielding member is rectangular, and a groove is provided at each of the four corners of the rectangle. On two adjacent main shielding members, the corresponding two grooves are connected to form the open slot.

[0015] Preferably, the secondary shield is made of high temperature resistant alloy or refractory material.

[0016] As described above, a heat shield of the present invention has the following beneficial effects:

[0017] A secondary shielding member is arranged between adjacent main shielding members, and the secondary shielding member can seal the gap between the two adjacent main shielding members to prevent the hot gas in the gas chamber from leaking from the gap. At the same time, since the secondary shielding member is directly opposite to the gap between the two adjacent main shielding members, the problem of hot gas leakage caused by the fixing member directly opposite to the gap and easy failure in a high temperature environment is avoided, and the gap between the two main shielding members is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a schematic diagram of the installation structure of a heat shield in this embodiment.

[0019] Figure 2 Display as Figure 1 Schematic diagram of the partial structure of a heat shield.

[0020] Figure 3 Display as Figure 1 Schematic diagram of the first cross-sectional structure along line AA in FIG.

[0021] Figure 4 Display as Figure 1 Schematic diagram of the second cross-sectional structure along line AA in FIG.

[0022] Component number description

[0023] 1 Support

[0024] 2 Main shield

[0025] 3 shielding parts

[0026] 4 Positioning slots

[0027] 5 Cooling channels

[0028] 6 Air conditioning side

[0029] 7 Hot gas side

[0030] 8 Sealing structure

[0031] 9a Through hole

[0032] 9b Hollow part

[0033] 10 Second bulge

[0034] 11 Gap

[0035] 12 Grooves

[0036] 13 First Bump

[0037] 14 Fixing parts

[0038] 15 Locking end DETAILED DESCRIPTION

[0039] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0040] like Figures 1 to 4As shown, the present invention provides a heat shield, comprising: a support member 1, a plurality of main shielding members 2 and a plurality of auxiliary shielding members 3, all of the main shielding members 2 are fixedly connected to the support member 1 through a fixing member 14, all of the main shielding members 2 are sequentially connected on a side facing a combustion chamber of a gas turbine to form a shielding portion, an open groove is provided between adjacent main shielding members 2 on a side facing the support member 1, the auxiliary shielding member 3 is provided in the open groove, one end of the fixing member 14 is fixed in the open groove, and the other end of the fixing member 14 is fixed to the support member 1.

[0041] A secondary shielding member 3 is arranged between adjacent main shielding members 2. The secondary shielding member 3 can seal the gap between two adjacent main shielding members 2 to prevent the hot gas in the gas chamber from leaking from the gap. At the same time, since the secondary shielding member 3 is directly opposite to the gap between the two adjacent main shielding members 2, the problem of hot gas leakage caused by the fixing member 14 directly opposite to the gap and failure under the action of high-temperature airflow is avoided, and the gap between the two main shielding members 2 is shortened, thereby further reducing the leakage of hot gas.

[0042] Specifically, in this embodiment, the position installation relationship between the main shielding member 2 and the auxiliary shielding member 3 is as follows: Figure 1 As shown, a secondary shielding member 3 is arranged between every two main shielding members 2; the positional relationship of the shielding members installed on the support member 1 is as shown in Figure 2 As shown, the shielding member is installed on the side of the support member 1 having the positioning groove 4, and forms a shielding portion on one side of the support member. Figure 2 As shown, in this embodiment, the main shielding member 2 is rectangular, and a groove 12 is provided at each of the four corners of the rectangle. In order to facilitate connection and fixation, the structure forming the groove 12 is composed of two protrusions, namely a first protrusion 13 and a second protrusion 10. The second protrusion 10 is more prominent than the first protrusion 13, and a groove 12 is formed between the first protrusion 13 and the second protrusion 10. The first protrusion 13 is used to connect the main shielding member 2 and the support member 1, and the second protrusion 10 is used for heat insulation. On two adjacent main shielding members 2, the corresponding two grooves 12 are connected to form an open groove, and the auxiliary shielding member 3 is arranged in the open groove to seal and block the gap between the two adjacent main shielding members 2 to prevent the hot gas in the gas chamber from leaking out. At the same time, if the auxiliary shielding member 3 is misaligned with the main shielding member 2 in the airflow direction, the main shielding member 2 can also be limited to jump in the axial direction. In order to ensure the normal operation of the auxiliary shielding member 3 and to achieve the function of shielding the leakage of hot gas and thermal radiation, the auxiliary shielding member 3 is a high-temperature resistant alloy or a refractory material.

[0043] Furthermore, in order to facilitate the air on the cold air side 6 to enter the interior of the heat shield structure for cooling, the support member 1 is provided with a cooling channel 5 that penetrates the support member 1, and the auxiliary shielding member 3 is provided with cooling holes. The cooling channel 5 is connected to all the cooling holes, and the hole ends of the cooling holes face the main shielding member 2.

[0044] The air on the cold air side 6 enters through the cooling channel 5 on the support 1, and then enters the positioning hole to cool the end of the fixing member 14 located in the positioning hole, thereby preventing the end of the fixing member from failing due to heat and losing the fixing and locking function, which would cause the leakage of hot gas and thermal radiation. At the same time, the air will also enter the open groove through the cooling hole to cool the other end of the fixing member 14 fixed in the open groove, thereby preventing the end of the fixing member 14 from failing due to heat and losing the fixing and locking function, which would cause the leakage of hot gas and thermal radiation.

[0045] In order to further prevent the leakage of hot gas and heat radiation in the combustion chamber, a sealing structure 8 is provided between the secondary shielding member 3 and the shielding portion. The sealing structure 8 is provided with through holes corresponding to the cooling holes. The through holes can ensure the circulation of cold air and play an indirect sealing role. At the same time, the sealing structure 8 can prevent the hot gas on the hot gas side 7 from leaking into the open groove, thereby preventing the fixing member 14 fixed in the open groove from failing due to heat. At the same time, in order to increase the sealing performance, a sealing structure 8 is provided on the contact surface between the secondary shielding member 3 and the second protrusion 10, wherein, as shown in FIG. Figure 4 As shown, the sealing structure 8 can be an integrated structure with the auxiliary shielding member 3, and the sealing surface of the sealing structure 8 is wavy; in addition, while ensuring the sealing performance, in order to avoid the inconvenience of using a comb tooth or wave-shaped sealing structure for some refractory materials, such as Figure 3 As shown, a sealing structure 8 can be embedded on the secondary shielding member 3 to ensure sealing.

[0046] In order to facilitate installation and positioning, the opening groove also has a limiting card groove at one end of the limiting fixing part 14, and the supporting part 1 is provided with a positioning groove 4 at the other end of the limiting fixing part 14. The limiting card groove and the positioning groove 4 respectively fix the two ends of the main fixing part 14 to realize the fixing and locking function of the fixing part 14; at the same time, the fixing groove can also be used as a circulation channel for cold air to cool the fixing part 14 fixed therein.

[0047] The secondary shielding member 3 may be Figure 3 In the structure shown, the auxiliary shielding member 3 has multiple through holes 9a (also known as the cooling holes mentioned above), and a sealing structure 8 is provided at the end of the auxiliary shielding member 3 that contacts the second protrusion 10. The sealing structure 8 is provided with a through hole corresponding to the through hole 9a. The through hole connects the mounting groove 4 and the groove 12, so that the air on the cold air side 6 enters through the cooling channel 5 and then enters the groove 12 through the through hole, thereby cooling the end of the locking end 15 to prevent the locking end 15 from being deformed due to heat and causing fixation failure.

[0048] The secondary shielding member 3 may be Figure 4In the structure shown, the secondary shielding has a hollow portion 9b connected to the outside, and the end of the secondary shielding member 3 that contacts the second protrusion 10 on the main shielding member 2 has a sealing structure 8. The sealing surface of the sealing structure 8 is wavy, and the sealing structure 8 has a plurality of connecting holes (also referred to as the cooling holes above), and the plurality of connecting holes (also referred to as the cooling holes above) are connected to the hollow portion 9b. The air on the cold air side 6 enters through the cooling channel 5, then enters the hollow portion 9b through the connecting holes, and finally enters the groove 12 and the gap between the two main shielding members 2, thereby cooling the locking end 15 and preventing thermal radiation leakage inside the heat shield.

[0049] The entire structure of the present invention can achieve triple protection, namely: the cooling air directly leading to the gap 11 between the main shielding parts 2 is the first protection to prevent the invasion of hot gas; the seal on the auxiliary shielding part 3 is the second protection, even if the hot gas invades through the gap 11, it can also be protected by the seal; the cooling air leading to the end of the fixing part 14 is the third protection to ensure that the temperature of the end of the fixing part 14 meets the requirements.

[0050] In summary, a heat shield according to the present invention can effectively reduce the harmful effects of hot gas leakage and heat radiation caused by the heat shield gap 11, can greatly avoid the contact between the end of the fixing member 14 and the hot gas, ensure the normal temperature of the end of the fixing member 14, and reduce the risk of failure.

[0051] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0052] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A heat shield for a gas turbine combustion chamber, characterized in that: include: A support member (1), a plurality of main shielding members (2) and a plurality of auxiliary shielding members (3), wherein all the main shielding members (2) are fixedly connected to the support member (1) via a fixing member (14), and all the main shielding members (2) are connected in sequence on a side facing a combustion chamber of a gas turbine to form a shielding portion, and an open groove is provided between adjacent main shielding members (2) on a side facing the support member (1), and the auxiliary shielding member (3) is provided in the open groove, and one end of the fixing member (14) is fixed in the open groove, and the other end of the fixing member (14) is fixed on the support member (1); and the support member (1) has A cooling channel (5) is provided through the support member (1); the auxiliary shielding member (3) is provided with cooling holes; the cooling channel (5) is connected to all the cooling holes, and the hole ends of the cooling holes face the main shielding member (2); a sealing structure (8) is provided between the auxiliary shielding member (3) and the shielding portion; the sealing structure (8) is provided with through holes corresponding to the cooling holes; the main shielding member (2) is rectangular, and a groove (12) is provided at each of the four corners of the rectangle; and on two adjacent main shielding members (2), the corresponding two grooves (12) are connected to form the open groove.

2. The heat shield according to claim 1, characterized in that: The sealing structure (8) and the auxiliary shielding component (3) are an integrated structure, and a sealing surface of the sealing structure (8) is wavy.

3. The heat shield according to claim 1, characterized in that: The sealing structure (8) and the auxiliary shielding component (3) are inlaid structures.

4. The heat shield according to claim 1, characterized in that: The opening groove also has a limiting slot for limiting one end of the fixing member (14).

5. The heat shield according to claim 3, characterized in that: The support member (1) is provided with a positioning groove (4) for limiting the other end of the fixing member (14).

6. The heat shield according to claim 1, characterized in that: The secondary shielding component (3) is made of a high-temperature resistant alloy or a refractory material.

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