A metal shell full high temperature sealing device

Abstract

The utility model discloses a kind of metal shell full high-temperature sealing devices, belong to metal high-temperature sealing field, aim at solving the problem that existing for high-temperature solid oxide battery's electric pile is mostly not applicable to full high-temperature environment. It includes upper end plate, shell, lower end plate, first high-temperature liquid seal, first high-temperature porous plate, second high-temperature liquid seal, second high-temperature porous plate, the shell is tubular;The upper end plate is provided with the first annular groove matched with the upper end of shell and the upper end of shell can be buckled with the first annular groove, the first gap is formed between the upper end of shell and the first annular groove, the first high-temperature liquid seal, first high-temperature porous plate are sequentially arranged in the first gap from bottom to top, the sidewall of the first annular groove is provided with a plurality of liquid storage grooves from bottom to top and the first high-temperature liquid seal can enter liquid storage groove from bottom to top when converting into liquid and expanding under high-temperature condition.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature metal sealing, specifically a high-temperature sealing device for a metal shell. Background Technology

[0002] High-temperature solid oxide batteries (SOCs) possess significant advantages, including high energy conversion efficiency, reversible power generation and electrolysis processes, and high waste heat quality. They hold great promise for solving the problems of efficient, sustainable, and pollution-free energy utilization. Currently, leading international SOC battery companies have begun mass production and market sales of their stacks. The high operating temperatures of these stacks (typically 600-800℃) necessitate suitable high-temperature resistant casing sealing structures designed by users. These designs must ensure sealing performance while mitigating the thermal deformation of the metal. The secrecy surrounding the sealing slurry design parameters by stack manufacturers leads to numerous difficulties in stack usage. Therefore, researching a fully high-temperature sealing device for a metal casing is of practical significance for solving the aforementioned problems, as well as other related issues in high-temperature metal sealing.

[0003] Currently, most existing high-temperature resistant sealing designs are not suitable for all-high-temperature environments. For example, Chinese patent application CN210153217U discloses a high-performance, high-pressure resistant trapezoidal combined seal, in which one part of the device is located in a high-temperature region and the other part in a low-temperature region. A heat insulation device is used between the high and low-temperature regions, and the low-temperature region is sealed using rubber products such as sealing rings. However, rubber is prone to softening and aging under high-temperature conditions, resulting in a short lifespan and poor reliability. Therefore, the related design products cannot be applied to all-high-temperature regions.

[0004] Chinese patent application CN118390988A discloses a high-temperature and high-pressure resistant metal seal that uses powder material for sealing. However, the powder material has poor compressibility and flowability. Furthermore, the bushing is fixed with screws, which cannot guarantee the corresponding tightening force at high temperatures, making it unsuitable for high-temperature sealing components.

[0005] Therefore, there is an urgent need for a new device and / or method to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to address the problem that most existing fuel cell stacks used in high-temperature solid oxide batteries are not suitable for fully high-temperature environments, and to provide a fully high-temperature sealing device for a metal casing. This application effectively solves the shortcomings of existing metal components, such as difficulty in sealing high-temperature areas and poor reliability, and is of great significance for ensuring the reliable operation of fuel cell stacks.

[0007] To achieve the above objectives, this application adopts the following technical solution.

[0008] A metal-cased high-temperature sealing device includes an upper end plate, an outer shell, a lower end plate, a first high-temperature liquid sealant, a first high-temperature resistant porous plate, a second high-temperature liquid sealant, and a second high-temperature resistant porous plate, wherein the outer shell is tubular; The upper end plate is provided with a first annular groove that matches the upper end of the outer shell, and the upper end of the outer shell can be engaged with the first annular groove. A first gap is formed between the upper end of the outer shell and the first annular groove. The first high-temperature liquid seal and the first high-temperature resistant porous plate are arranged sequentially from bottom to top in the first gap. Several liquid storage tanks are arranged from bottom to top on the side wall of the first annular groove, and the first high-temperature liquid seal can enter the liquid storage tank from bottom to top when it is converted into liquid and expands under high temperature conditions. The lower end plate is provided with a second annular groove that mates with the lower end of the outer shell. The lower end of the outer shell is located in the second annular groove, and a second gap is formed between the lower outer wall of the outer shell and the second annular groove. The second high-temperature liquid seal and the second high-temperature resistant porous plate are arranged sequentially from bottom to top in the second gap. Several liquid storage tanks are arranged from bottom to top on the side wall of the second annular groove, and the second high-temperature liquid seal can enter the liquid storage tank from bottom to top when it is converted into liquid and expands under high temperature conditions.

[0009] The outer shell is rectangular tubular.

[0010] The first high-temperature liquid seal and the second high-temperature liquid seal are solid at room temperature and liquid at high temperature.

[0011] The first high-temperature liquid seal and the second high-temperature liquid seal are one or more of inorganic silica gel and liquid metal.

[0012] The first and second high-temperature liquid seals are solid metals at room temperature and liquid at temperatures above 300°C.

[0013] The first high-temperature liquid seal and the second high-temperature liquid seal are made of tin.

[0014] The second annular groove is rectangular and located in the middle of the outer casing and along a plane perpendicular to the axial direction of the outer casing.

[0015] The first center plate and the first side plate are integrally formed.

[0016] The first high-temperature resistant porous plate and the first high-temperature resistant porous plate are aluminum silicate cotton boards.

[0017] Two liquid storage tanks are provided on the side wall of the first annular groove from bottom to top.

[0018] Two liquid storage tanks are provided on the side wall of the second annular groove from bottom to top.

[0019] The upper end of the outer shell is folded inward to form a third inner folded edge. The upper end plate includes a first center plate and a first side plate arranged circumferentially along the side edge of the first center plate. The first center plate is arranged in a horizontal direction, and the first side plate is arranged in a vertical direction. The lower end of the first side plate is folded outward to form a first annular groove that cooperates with the third inner folded edge. The third inner folded edge can be fastened in the first annular groove, and a first gap is formed between the side wall of the third inner folded edge and the first annular groove.

[0020] The upper end of the upper plate and the cross-section of the first annular groove are U-shaped or U-shaped.

[0021] Compared with existing technologies, this invention can be applied to high-temperature environments of 600-1000℃, achieving sealing of the metal interface. Simultaneously, this invention avoids the thermal stress on the upper and lower end plates caused by the thermal expansion of the outer shell at high temperatures. It achieves a triple seal through a U-shaped metal surface, a high-temperature adhesive, and aluminum silicate cotton, solving the problem of difficult sealing in high-temperature metal areas. Furthermore, the sealing materials used in this application are common and readily available, possessing excellent high-temperature resistance, low cost, and high reliability.

[0022] This application achieves a complete high-temperature seal between metal components through a U-shaped structure design combined with high-temperature resistant materials and a triple-seal design. It boasts significant advantages in terms of low cost and high reliability, greatly promoting the engineering development and commercial application of high-temperature metal sealing. This application can be used in the design of high-temperature solid oxide fuel cell stack shell structures and the sealing design of other high-temperature components, significantly advancing the engineering development and commercial application of high-temperature metal sealing. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the metal shell high-temperature sealing device in Example 1.

[0024] Figure 2 This is a cross-sectional view of a metal-cased, fully high-temperature sealed device.

[0025] Figure 3 for Figure 2 A magnified view of part I in the diagram.

[0026] Figure 4 for Figure 2 A magnified view of part II.

[0027] The markings in the diagram are: 1. Upper end plate, 2. Outer shell, 3. Lower end plate, 4. First high-temperature resistant porous plate, 5. First high-temperature liquid seal, 6. Second high-temperature resistant porous plate, 7. Second high-temperature liquid seal, 8. Liquid storage tank. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings.

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0030] Example 1, as shown in the figure, provides a metal-cased high-temperature sealing device, including an upper end plate, an outer shell, a lower end plate, a first high-temperature liquid sealant, a first high-temperature resistant porous plate, a second high-temperature liquid sealant, and a second high-temperature resistant porous plate. The outer shell is tubular. In a specific example, the outer shell is rectangular tubular, and the interior of the outer shell can be used to house the stack of a high-temperature solid oxide battery.

[0031] The upper end plate has a first annular groove that mates with the upper end of the outer shell, and the upper end of the outer shell can engage with the first annular groove. Figure 3 As shown, in a specific example, the upper end of the outer shell folds inward to form a third inner folded edge; the upper end plate includes a first center plate and a first side plate arranged circumferentially along the side edge of the first center plate, the first center plate being arranged horizontally and the first side plate being arranged vertically; the lower end of the first side plate folds outward to form a first annular groove that mates with the third inner folded edge, the third inner folded edge being able to engage within the first annular groove, and a first gap being formed between the side wall of the third inner folded edge and the first annular groove. As shown in the figure, the upper end of the upper end plate and the cross-section of the first annular groove are U-shaped or U-shaped, respectively.

[0032] like Figure 3 As shown, a first high-temperature liquid seal and a first high-temperature resistant perforated plate are sequentially arranged from bottom to top within the first gap; several liquid storage tanks are arranged from bottom to top on the side wall of the first annular groove. In a specific example, two liquid storage tanks are arranged from bottom to top on the side wall of the first annular groove; the lower liquid storage tank is 1mm high and 1mm wide; the upper liquid storage tank is 1mm high and 2mm wide; the lower and upper liquid storage tanks form a stepped distribution, which facilitates ensuring the sealing performance within the U-shaped groove. In this application, the first high-temperature liquid seal is a solid metal at room temperature and a liquid at high temperature; when the first high-temperature liquid seal transforms into a liquid under high-temperature conditions and expands, it can enter the liquid storage tank from bottom to top. In a specific example, the first high-temperature liquid seal is a block of metallic tin. Metallic tin is soft, easily bent, has a melting point of 231.89°C, and a boiling point of 2260°C. The filling high-temperature resistant refractory solution can be a metallic tin solution, which is not easily volatile and can be stored in the groove in a solution state for a long time.

[0033] Meanwhile, a second annular groove is provided on the lower end plate to mate with the lower end of the outer shell. The lower end of the outer shell is positioned within the second annular groove, and a second gap is formed between the outer wall of the lower end of the outer shell and the second annular groove. A second high-temperature liquid seal and a second high-temperature resistant porous plate are sequentially arranged in the second gap from bottom to top. Several liquid storage tanks are arranged on the side wall of the second annular groove from bottom to top, and the second high-temperature liquid seal can enter the liquid storage tanks from bottom to top when it transforms into a liquid state and expands under high-temperature conditions. In a specific example, two liquid storage tanks are arranged on the side wall of the first annular groove from bottom to top; the lower liquid storage tank is 1mm high and 1mm wide; the upper liquid storage tank is 1mm high and 2mm wide; the lower and upper liquid storage tanks form a stepped distribution to ensure the sealing performance within the U-shaped groove. In a specific example, the second annular groove is U-shaped, and its depth is selected to be 40mm. To achieve the corresponding groove depth, extension ribs are welded to both sides of the lower end plate to ensure the depth of the U-shaped groove.

[0034] As an alternative, the first and second high-temperature liquid sealants are made of inorganic silicone gel, which is respectively placed at the bottom of the first and second gaps, with corresponding first and second high-temperature resistant porous plates mounted on them. In a specific example, the first and second high-temperature resistant porous plates are aluminum silicate cotton boards. The sealing performance of the contact points is ensured through the cooperation between the first high-temperature liquid sealant and the first high-temperature resistant porous plate, and the cooperation between the second high-temperature liquid sealant and the second high-temperature resistant porous plate. The novel inorganic silicone gel has the characteristics of high temperature resistance, non-toxicity, fire resistance, adhesion, and fluidity, and can bond to tiny gaps in metal contact points, achieving reliable sealing of high-temperature metal contact points.

[0035] In this embodiment, the upper end plate and the outer shell are interlocked via a U-shaped groove structure, and the lower end plate connection also adopts a U-shaped groove structure, contacting the straight plate of the outer shell. During use, the upper end plate and the outer shell, and the lower end plate and the outer shell, make surface contact to achieve a primary seal. A first high-temperature liquid sealant and a second high-temperature liquid sealant are respectively installed in the first and second annular grooves to form a secondary seal. A first high-temperature resistant porous plate and a second high-temperature resistant porous plate are respectively installed above the first and second high-temperature liquid sealants and compacted to achieve a tertiary seal, and also serve to fix the position of the outer shell and the upper and lower end plates. Furthermore, this application employs a multi-stage liquid storage tank design to prevent solution overflow caused by metal thermal expansion during high-temperature operation, facilitating temporary storage. In this application, the first and second high-temperature resistant porous plates are made of high-temperature resistant materials, which are common and readily available, avoiding the problem of difficulty in obtaining high-temperature sealing slurry, and achieving high-temperature (1000℃) sealing of the metal shell.

[0036] The operation process of the metal-cased high-temperature sealed device for the fuel cell stack is as follows: first, place the lower end plate, then place the high-temperature solid oxide battery stack on the lower end plate, and then place the upper end plate on top of the fuel cell stack; after the upper end plate is placed, place the outer casing from top to bottom.

[0037] In summary, this application achieves reliable sealing between metal components through a U-shaped structure design and high-temperature resistant materials, using a three-stage sealing design. It can be used in the design of high-temperature solid oxide fuel cell shell structures and other high-temperature component sealing designs, which can greatly promote the engineering development and commercial application of high-temperature metal sealing.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. Various variations can be made to the above embodiments of the present invention. That is, all simple and equivalent changes and modifications made based on the claims and description of this invention fall within the protection scope of the claims of this patent. All aspects not described in detail in this invention are conventional technical content.

Claims

1. A metal-cased, high-temperature sealing device, characterized in that, It includes an upper end plate, a shell, a lower end plate, a first high-temperature liquid seal, a first high-temperature resistant porous plate, a second high-temperature liquid seal, and a second high-temperature resistant porous plate, wherein the shell is tubular; The upper end plate is provided with a first annular groove that matches the upper end of the outer shell, and the upper end of the outer shell can be engaged with the first annular groove. A first gap is formed between the upper end of the outer shell and the first annular groove. The first high-temperature liquid seal and the first high-temperature resistant porous plate are arranged sequentially from bottom to top in the first gap. Several liquid storage tanks are arranged from bottom to top on the side wall of the first annular groove, and the first high-temperature liquid seal can enter the liquid storage tank from bottom to top when it is converted into liquid and expands under high temperature conditions. The lower end plate is provided with a second annular groove that mates with the lower end of the outer shell. The lower end of the outer shell is located in the second annular groove, and a second gap is formed between the lower outer wall of the outer shell and the second annular groove. The second high-temperature liquid seal and the second high-temperature resistant porous plate are arranged sequentially from bottom to top in the second gap. Several liquid storage tanks are arranged from bottom to top on the side wall of the second annular groove, and the second high-temperature liquid seal can enter the liquid storage tank from bottom to top when it is converted into liquid and expands under high temperature conditions.

2. The metal casing high-temperature sealing device according to claim 1, characterized in that, The outer shell is rectangular tubular.

3. The metal casing high-temperature sealing device according to claim 1, characterized in that, The first high-temperature liquid seal and the second high-temperature liquid seal are solid at room temperature and liquid at high temperature.

4. The metal casing high-temperature sealing device according to claim 3, characterized in that, The first high-temperature liquid seal and the second high-temperature liquid seal are one or more of inorganic silica gel and liquid metal.

5. The metal casing high-temperature sealing device according to claim 4, characterized in that, The first high-temperature liquid seal and the second high-temperature liquid seal are made of tin.

6. The metal casing high-temperature sealing device according to claim 1, characterized in that, The first high-temperature resistant porous plate and the first high-temperature resistant porous plate are aluminum silicate cotton boards.

7. The metal casing high-temperature sealing device according to any one of claims 1 to 6, characterized in that, The upper end of the outer shell is folded inward to form a third inner folded edge. The upper end plate includes a first center plate and a first side plate arranged circumferentially along the side edge of the first center plate. The first center plate is arranged in a horizontal direction, and the first side plate is arranged in a vertical direction. The lower end of the first side plate is folded outward to form a first annular groove that cooperates with the third inner folded edge. The third inner folded edge can be fastened in the first annular groove, and a first gap is formed between the side wall of the third inner folded edge and the first annular groove.

8. The metal casing high-temperature sealing device according to claim 7, characterized in that, The upper end of the upper plate and the cross-section of the first annular groove are U-shaped or U-shaped.

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