High-stability SiC heat exchanger and sealing structure thereof

Abstract

The invention relates to the technical field of SiC heat exchangers, in particular to a high-stability SiC heat exchanger and a sealing structure thereof.The high-stability SiC heat exchanger comprises a shell, an end socket, a tube plate, a heat exchange tube, a baffling assembly and a sealing assembly, the tube plate is fixedly installed above the shell, a tube hole matched with the heat exchange tube is formed in the tube plate, the heat exchange tube is arranged in the tube hole of the tube plate in a penetrating mode, and the baffling assembly is arranged in the shell. The end socket is arranged on the side, away from the shell, of the tube plate, the baffling assembly is arranged in an inner cavity of the shell, through holes corresponding to the heat exchange tubes are formed in the baffling assembly, the sealing assembly is arranged at the connecting position of the tube plate and the heat exchange tubes, and the sealing assembly is composed of a fastening nut, the tube plate, a first sealing gasket, a second sealing gasket, a sealing ring, a sealing ring and the heat exchange tubes. According to the device, the situation that due to overpressure, the friction force of the heat exchange tubes is too large, and sliding of the heat exchange tubes is affected can be avoided, and the situation that the sealing capacity is reduced due to deformation of the tube plate material under the long-time use condition can be avoided.

Description

Technical Field

[0001] This invention relates to the field of SiC heat exchanger technology, and in particular to a highly stable SiC heat exchanger and its sealing structure. Background Technology

[0002] A heat exchanger is a device that transfers some of the heat from a hot fluid to a cold fluid; it is also called a heat exchanger. Heat exchangers play an important role in chemical, petroleum, power, food, and many other industrial production processes. In chemical production, heat exchangers are widely used as heaters, coolers, condensers, evaporators, and reboilers.

[0003] Currently, heat exchangers all use sealing rings or sealing rings plus gaskets for sealing. The degree of compression of the sealing ring during installation is not easy to control, which can easily lead to excessive pressure between the sealing component and the heat exchange tube, resulting in poor sliding of the heat exchange tube. When the temperature changes, the tube sheet nut will be stressed, causing the tube sheet to deform. At the same time, the sealing ring will exert force on the tube sheet, and the sealing force will decrease over time, requiring continuous increase of pre-tightening force, which leads to increased maintenance frequency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a highly stable SiC heat exchanger and its sealing structure. It solves the problem that existing heat exchangers all use sealing rings or a combination of sealing rings and gaskets. These methods suffer from several drawbacks: the compression of the sealing ring during installation is difficult to control; excessive pressure between the sealing components and the heat exchange tubes can lead to poor tube sliding; and temperature changes can cause the tube sheet nuts to deform due to stress. Furthermore, the force exerted by the sealing ring on the tube sheet during long-term use reduces the sealing force, requiring continuous increases in pre-tightening force and ultimately increasing maintenance frequency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A high-stability SiC heat exchanger and its sealing structure include a shell, end caps, a tube sheet, heat exchange tubes, a baffle assembly, and a sealing assembly. The tube sheet is fixedly installed at both ends of the shell, and the tube sheet has tube holes adapted to the heat exchange tubes. The heat exchange tubes pass through the tube holes of the tube sheet. The end caps are located on the side of the tube sheet away from the shell. The baffle assembly is located in the inner cavity of the shell and has through holes corresponding to the positions of the heat exchange tubes. The sealing assembly is located at the connection between the tube sheet and the heat exchange tubes.

[0006] Preferably, the sealing assembly consists of a fastening nut, a tube sheet, a sealing ring, a first sealing gasket, a second sealing gasket, a sealing ring, and a heat exchange tube.

[0007] Preferably, the fastening nut is threadedly connected to the tube sheet, and the sealing ring is located below the fastening nut.

[0008] Preferably, the first sealing gasket is disposed between the sealing ring and the fastening nut, the minor diameter of the fastening nut thread is larger than the diameter of the tube sheet sealing groove, and the bottom of the nut groove is flush with the top of the sealing ring after installation. Under the action of the first sealing gasket, the tube-side material is sealed to the outer wall of the sealing ring. The second sealing gasket is disposed between the sealing ring and the bottom of the sealing groove of the tube sheet. The presence of the first and second sealing gaskets prevents the tube-side and shell-side materials from contacting the outer wall of the sealing ring.

[0009] Preferably, the sealing ring is disposed between the sealing ring and the heat exchange tube, located inside the sealing ring groove of the sealing ring, and the sealing ring is used for sealing between the sealing ring and the heat exchange tube.

[0010] Preferably, the sealing ring consists of a sealing ring base, multiple sealing ring grooves, and a reinforcing layer. The multiple sealing ring grooves are formed on the sealing ring base, and the sealing rings are embedded in the sealing ring grooves. The reinforcing layer is disposed on the outside of the sealing ring base. The reinforcing layer can be made of high-strength metal or special plastic, thereby increasing the overall strength of the sealing ring.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. Using a sealing ring as the structure to fix the O-ring ensures that the sealing ring structure is fixed and is not affected by the tightening force of the nut, thus ensuring the appropriate deformation of the O-ring and avoiding excessive friction of the heat exchange tube due to overpressure, which would affect the sliding of the heat exchange tube.

[0012] 2. A gasket is added between the sealing ring, the fastening nut, and the bottom of the tube sheet sealing groove. The gasket can be made of silicone, expanded PTFE, or other materials to prevent the tube-side and shell-side materials from contacting the side material of the sealing ring.

[0013] Third, the sealing ring is set independently of the tube sheet and can be made of a high-strength, low-creep material that is different from the tube sheet, or it can be made of an external reinforcement structure. This can avoid the decrease in sealing capacity caused by the deformation of the tube sheet material under long-term use. Attached Figure Description

[0014] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0015] Figure 1 This is a planar structural diagram of the present invention; Figure 2 This is a planar structural diagram of the sealing assembly of the present invention; Figure 3 This is a planar structural diagram of the sealing ring of the present invention.

[0016] Legend: 1. Shell; 2. Head; 3. Tube sheet; 4. Heat exchange tube; 5. Baffle assembly; 6. Sealing assembly; 7. Sealing ring; 8. Sealing ring; 9. First sealing gasket; 10. Second sealing gasket; 11. Fastening nut; 12. Sealing ring base; 13. Sealing ring groove; 14. Reinforcing layer. Detailed Implementation

[0017] This application provides a highly stable SiC heat exchanger and its sealing structure, effectively solving the problem that existing heat exchangers use sealing rings or sealing rings + gaskets for sealing. These methods suffer from difficulties in controlling the compression degree of the sealing ring during installation, leading to excessive pressure between the sealing components and the heat exchange tubes, resulting in poor tube sliding. Consequently, temperature changes cause stress on the tube sheet nuts, causing tube sheet deformation. Furthermore, long-term use reduces the sealing force due to the force exerted by the sealing ring on the tube sheet, requiring continuous increases in pre-tightening force and ultimately increasing maintenance frequency. This device avoids excessive friction on the heat exchange tubes due to overpressure, which affects tube sliding, and prevents a decrease in sealing capacity caused by tube sheet material deformation under prolonged use.

[0018] Example like Figure 1 , Figure 2 and Figure 3 As shown, the technical solution in this application embodiment effectively solves the problem that existing heat exchangers all use sealing rings or sealing rings + The sealing method of the gasket has the problem of difficulty in controlling the compression degree of the sealing ring during installation. It is easy for the heat exchange tube to slide poorly due to excessive clamping force between the sealing component and the heat exchange tube. As a result, the tube sheet nut is subjected to force and the tube sheet is deformed when the temperature changes. Moreover, the force of the sealing ring on the tube sheet will reduce the sealing force during long-term use, and the pre-tightening force needs to be continuously increased, which ultimately increases the maintenance frequency. The overall idea is as follows: A high-stability SiC heat exchanger and its sealing structure, including a shell 1, a head 2, a tube sheet 3, heat exchange tubes 4, a baffle assembly 5 and a sealing assembly 6. The tube sheet 3 is fixedly installed at both ends of the shell 1. The tube sheet 3 has tube holes adapted to the heat exchange tubes 4. The heat exchange tubes 4 pass through the tube holes of the tube sheet 3. The head 2 is set on the side of the tube sheet 3 away from the shell 1. The baffle assembly 5 is set in the inner cavity of the shell 1. The baffle assembly 5 has through holes corresponding to the positions of the heat exchange tubes 4. The sealing assembly 6 is set at the connection between the tube sheet 3 and the heat exchange tubes 4.

[0019] The sealing assembly 6 consists of a fastening nut 11, a tube sheet 3, a sealing ring 8, a first sealing gasket 9, a second sealing gasket 10, a sealing ring 7, and heat exchange tubes 4. The fastening nut 11 is threadedly connected to the tube sheet 3. The sealing ring 8 is located below the fastening nut 11. The first sealing gasket 9 is located between the sealing ring 8 and the fastening nut 11. The minor diameter of the thread of the fastening nut 11 is larger than the diameter of the sealing groove on the tube sheet. The bottom of the nut groove is flush with the top of the sealing ring 8 after installation. The first sealing gasket 9 seals the tube-side material against the outer wall of the sealing ring 8. The second sealing gasket 10 is located between the sealing ring 7 and the bottom of the sealing groove on the tube sheet 3. The presence of the first and second sealing gaskets 9 and 10 prevents the tube-side and shell-side materials from contacting the outer wall of the sealing ring. The sealing ring 7 is located between the sealing ring 8 and the heat exchange tubes 4, in the sealing ring groove of the sealing ring 8. Inside the tube sheet 13, the sealing ring 7 is used for sealing between the sealing ring 8 and the heat exchange tube 4. The sealing ring 8 consists of a sealing ring base 12, which is made of a high-cleanliness material, multiple sealing ring grooves 13, and a reinforcing layer 14. For some media that require PTFE material as the sealing ring base, an external reinforcing layer structure can be used. The reinforcing layer 14 can be metal, special plastic, etc. Multiple sealing ring grooves 13 are formed on the sealing ring base 12, and the sealing ring 7 is embedded in the sealing ring grooves 13. The reinforcing layer 14 is set on the outside of the sealing ring base 12. The sealing ring 8 is a pre-processed structure that will not change due to different degrees of nut tightening, thus ensuring the stability of the deformation of the sealing ring 7. The deformation of the sealing ring 7 is controllable, which also ensures good sliding performance of the heat exchange tube 4, thereby avoiding deformation of the tube sheet 3 under stress.

[0020] To address the problems existing in the prior art, the present invention provides a highly stable SiC heat exchanger and its sealing structure. This device can prevent excessive friction of the heat exchange tubes due to overpressure, which would affect the sliding of the heat exchange tubes, and can prevent the sealing capacity from decreasing due to deformation of the tube sheet material under long-term use.

[0021] Working principle: In the first step, the tube-side medium is guided by the end cap 2 and flows into the heat exchange tube 4. Heat is transferred to the outside of the tube through the tube wall of the heat exchange tube 4. The shell-side medium enters the shell 1 and flows around the heat exchange tube 4. It exchanges heat with the tube-side medium through the tube wall of the heat exchange tube 4. In the second step, when the shell-side medium flows through the baffle assembly 5 inside the shell 1, the baffle assembly 5 forcibly changes the flow direction of the medium, increases the contact area and residence time between the medium and the outer wall of the heat exchange tube 4, and further improves the heat exchange efficiency of the tube-side and shell-side medium. The third step involves a prefabricated fixed structure for the sealing ring 8, which is tightened by the fastening nut 11 and does not deform with the tightening force. This ensures that the deformation of the inner wall sealing ring 7 is controllable, preventing both media leakage and obstruction of the sliding of the heat exchange tube 4. The first sealing gasket 9 and the second sealing gasket 10 provide layered sealing to block media leakage in both the tube side and the shell side. The sealing ring 8 also includes a reinforcing layer, which further resists deformation and protects the tube sheet 3. Fourth, during intermittent start-up and shutdown, the heat exchange tube 4 can slide along the tube hole of the tube sheet 3 due to thermal expansion and contraction caused by temperature difference, thus avoiding stress on the tube sheet 3; the sealing component 6 maintains sealing force for a long time without the need to frequently increase the pre-tightening force, reducing maintenance frequency and adapting to the needs of intermittent operation.

[0022] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A high-stability SiC heat exchanger and its sealing structure, characterized in that, The assembly includes a shell (1), a head (2), a tube sheet (3), a heat exchange tube (4), a baffle assembly (5), and a sealing assembly (6). The tube sheet (3) is fixedly installed at both ends of the shell (1). The tube sheet (3) has tube holes that are compatible with the heat exchange tube (4). The heat exchange tube (4) passes through the tube holes of the tube sheet (3). The head (2) is located on the side of the tube sheet (3) away from the shell (1). The baffle assembly (5) is located in the inner cavity of the shell (1). The baffle assembly (5) has through holes corresponding to the position of the heat exchange tube (4). The sealing assembly (6) is located at the connection between the tube sheet (3) and the heat exchange tube (4).

2. The high-stability SiC heat exchanger and its sealing structure as described in claim 1, characterized in that, The sealing assembly (6) consists of a fastening nut (11), a tube sheet (3), a sealing ring (8), a first sealing gasket (9), a second sealing gasket (10), a sealing ring (7), and a heat exchange tube (4).

3. The high-stability SiC heat exchanger and its sealing structure as described in claim 2, characterized in that, The fastening nut (11) is connected to the tube sheet (3) by threads, and the sealing ring (8) is located below the fastening nut (11).

4. The high-stability SiC heat exchanger and its sealing structure as described in claim 3, characterized in that, The first sealing gasket (9) is placed between the sealing ring (8) and the fastening nut (11). The small diameter of the thread of the fastening nut (11) is larger than the diameter of the tube sheet sealing groove. The bottom of the nut groove is flush with the top of the sealing ring (8) after installation. Under the action of the first sealing gasket (9), the tube material is sealed to the outer wall of the sealing ring (8).

5. The high-stability SiC heat exchanger and its sealing structure as described in claim 4, characterized in that, The second sealing gasket (10) is disposed between the sealing ring (7) and the bottom of the sealing groove of the tube sheet (3). The presence of the first sealing gasket (9) and the second sealing gasket (10) prevents the tube-side and shell-side materials from contacting the outer wall of the sealing ring.

6. The high-stability SiC heat exchanger and its sealing structure as described in claim 5, characterized in that, The sealing ring (7) is disposed between the sealing ring (8) and the heat exchange tube (4), and is located inside the sealing ring groove (13) of the sealing ring (8). The sealing ring (7) is used for sealing between the sealing ring (8) and the heat exchange tube (4).

7. A high-stability SiC heat exchanger and its sealing structure as described in claim 6, characterized in that, The sealing ring (8) is composed of a sealing ring base (12), multiple sealing ring grooves (13) and a reinforcing layer (14).

8. The high-stability SiC heat exchanger and its sealing structure as described in claim 7, characterized in that, Multiple sealing ring grooves (13) are formed on the sealing ring base (12).

9. A high-stability SiC heat exchanger and its sealing structure as described in claim 7, characterized in that, The sealing ring (7) is embedded in the sealing ring groove (13).

10. A high-stability SiC heat exchanger and its sealing structure as described in claim 7, characterized in that, The reinforcing layer (14) is disposed on the outside of the sealing ring base (12). The reinforcing layer (14) can be made of high-strength metal or special plastic, thereby increasing the overall strength of the sealing ring (8).

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