Sealing structure for silicon carbide heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, and discloses a sealing structure for a silicon carbide heat exchanger, which comprises a shell, a tube box and a tube plate, a partition plate is arranged in the tube box, the partition plate divides the tube box into two cavities, a groove is arranged on the tube plate, a sealing gasket is arranged in the groove, the tube box is connected with the tube plate through the sealing gasket in a sealing mode, and the sealing gasket is arranged in the shell. A sealing gasket is arranged on the pipe plate, a sealing strip is arranged in the middle of the sealing gasket, the partition plate and the sealing strip are sealed, a plurality of installation holes are formed in the pipe plate, heat exchange pipes are installed in the installation holes, and a pipe fitting sealing assembly is arranged between the heat exchange pipes and the pipe plate. The sealing effect is improved by strengthening extrusion and avoiding direct impact of liquid.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, and more specifically, to a sealing structure for a silicon carbide heat exchanger. Background Technique

[0002] A silicon carbide heat exchanger is a device used to transfer heat between different media and is widely applied in fields such as industry, refrigeration, heating, and chemical engineering. The main function of the heat exchanger is to achieve heat exchange through the heat conduction between fluids in different structures, making the sealing structure a crucial link in the design and manufacturing process of the heat exchanger, which is directly related to the performance and safety of the heat exchanger.

[0003] The Chinese invention patent with the application number 202410749007.7 discloses a heat exchanger and a sealing method based on the comprehensive optimization of bolt pre-tightening force and sealing structure. It is provided with a sealing ring with a special structure, which disperses the stress concentration of the fluid on the unit sealing surface, thereby enhancing the sealing effect and prolonging the service life of the sealing ring. However, for a shell-and-tube heat exchanger, the sealing between different cavities in the tube box and between the heat exchange tubes and the tube sheet is equally important. Currently, the sealing ring with good sealing effect cannot be clamped between the heat exchange tubes and the tube sheet, and it is likely to be washed away by the fluid and fall off during long-term use, resulting in leakage. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present utility model is to provide a sealing structure for a silicon carbide heat exchanger with good sealing effect.

[0005] To achieve the above purpose, the present utility model provides the following technical solutions:

[0006] A sealing structure for a silicon carbide heat exchanger, including a shell, a tube box, and a tube sheet. A partition is arranged in the tube box, and the partition divides the tube box into two chambers. A groove is formed on the tube sheet, and a sealing gasket is installed in the groove. The tube box and the tube sheet are sealed and connected through the sealing gasket. A sealing strip is arranged in the middle of the sealing gasket, and the partition is sealed with the sealing strip. A plurality of mounting holes are formed on the tube sheet, and heat exchange tubes are installed in the mounting holes. A pipe fitting sealing assembly is arranged between the heat exchange tubes and the tube sheet.

[0007] The present utility model is further arranged as follows: The heat exchange tube is a "U" - shaped tube, and tube heads are arranged at both ends of the heat exchange tube. A convex platform is arranged between the tube head and the heat exchange tube, and the convex platform is on the side of the tube sheet facing the shell. The other end of the tube head extends into the tube box and is axially provided with a plurality of drainage grooves.

[0008] The present utility model is further configured as follows: The pipe fitting sealing assembly includes a threaded sleeve, the threaded sleeve is sleeved on the pipe head, the threaded sleeve penetrates through the mounting hole, one end of the threaded sleeve inside the housing is provided with an end face, one side of the end face abuts against the boss, and the other side of the end face can cover the mounting hole. One end of the threaded sleeve inside the tube sheet is provided with threads, and a nut is installed on the threads, and the nut can cover the mounting hole. A rubber sleeve is provided between the threaded sleeve and the mounting hole.

[0009] The present utility model is further configured as follows: The mounting hole is frustum-shaped, and the large-diameter end of the frustum of the mounting hole faces the housing side.

[0010] The present utility model is further configured as follows: A plurality of dial rods are connected to the end of the nut facing away from the tube sheet.

[0011] The present utility model is further configured as follows: The cross-section of the sealing strip is set in a "Ji" shape. The arched part of the sealing strip fits with the groove of the tube sheet. The two sides of the sealing strip extend to both sides respectively and fit with the plate surface of the tube sheet. A pressing block is provided on one side of the partition plate facing the tube sheet. The cross-section of the pressing block is in a "mountain" shape, and the pressing block is correspondingly clamped with the sealing strip.

[0012] The advantages of the present utility model are:

[0013] 1. A boss is provided on the heat exchange tube. The threaded sleeve of the pipe fitting sealing assembly is sleeved on the pipe head, and one end of the threaded sleeve abuts against the boss. A rubber sleeve is provided around the outer periphery of the threaded sleeve. The mounting hole is frustum-shaped, and the large-diameter end of the mounting hole faces the housing side. During installation, the heat exchange tube drives the threaded sleeve and the rubber sleeve thereon to pass through the mounting hole, and the threaded part of the threaded sleeve passes through the mounting hole. The nut is screwed tightly on the threaded sleeve until the end face of the threaded sleeve fits with the other side of the tube sheet, and the installation is completed. At this time, the threaded sleeve and the mounting hole jointly squeeze the rubber sleeve, so that the rubber sleeve always maintains an outward expansion and fits on the joint surface, and has a better sealing effect compared with a single sealing ring;

[0014] 2. The end face of the threaded sleeve and the nut respectively cover the mounting hole from both ends, reducing the contact between the rubber sleeve and the liquid in the heat exchanger, prolonging the service life of the sealing structure and improving the sealing effect at the same time;

[0015] 3. The pressing block of the partition plate covers the sealing strip. The cross-section of the sealing strip is set in a "Ji" shape, and the cross-section of the pressing block is correspondingly set in a "mountain" shape. The pressing block can be clamped with the sealing strip, thereby reducing the contact between the sealing strip and the liquid in the tube sheet, prolonging the service life of the sealing strip, and at the same time, the pressing block and the sealing strip form a labyrinth seal, improving the sealing effect. Description of the Drawings

[0016] Figure 1Schematic structural diagram of an embodiment of the present utility model;

[0017] Figure 2 is the sectional view along the Figure 1 indicated line A-A;

[0018] Figure 3 is Figure 2 the enlarged view of part B shown;

[0019] Figure 4 Schematic structural diagram of the tube sheet of the present utility model;

[0020] Figure 5 is Figure 4 the enlarged view of part C shown;

[0021] In the figure: 1, shell; 2, tube box; 21, partition; 22, pressing block; 3, tube sheet; 31, mounting hole; 4, heat exchange tube; 41, tube head; 42, boss; 43, drainage groove; 5, gasket; 51, sealing strip; 6, pipe fitting sealing assembly; 61, threaded sleeve; 62, rubber sleeve; 63, nut; 64, lever. Detailed implementation manners

[0022] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0023] It should be pointed out that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0024] In the present utility model, unless otherwise stated, the orientations such as "upper, lower" are usually in the directions shown in the drawings, or in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left, right" are usually in the left and right shown in the drawings; "inside, outside" refer to the inside and outside relative to the contours of the respective components, but the above orientation terms do not limit the present utility model.

[0025] Please refer to Figures 1-5 , the present utility model provides the following technical solutions:

[0026] A sealing structure for a silicon carbide heat exchanger, including a shell 1, a tube box 2 and a tube sheet 3. A partition 21 is arranged in the tube box 2, and the partition 21 divides the tube box 2 into two chambers. A groove is formed on the tube sheet 3, and a gasket 5 is installed in the groove. The tube box 2 and the tube sheet 3 are sealed and connected through the gasket 5. A sealing strip 51 is arranged in the middle of the gasket 5, and the partition 21 is sealed with the sealing strip 51, that is, the gasket 5 cooperates with the tube box 2 to seal both chambers of the tube box 2;

[0027] A plurality of mounting holes 31 are provided on the tube sheet 3 , in which heat exchange tubes 4 are installed. A pipe sealing assembly 6 is provided between the heat exchange tubes 4 and the tube sheet 3 , and the pipe sealing assembly 6 can seal the connection surface between the heat exchange tubes 4 and the mounting holes 31 .

[0028] The heat exchange tube 4 is a U-shaped tube. Both ends of the heat exchange tube 4 are provided with a tube head 41. A boss 42 is provided between the tube head 41 and the heat exchange tube 4. The boss 42 is on the side of the tube sheet 3 facing the shell 1. The other end of the tube head 41 extends into the tube box 2 and is provided with a plurality of drainage grooves 43 along the axial direction.

[0029] The pipe sealing assembly 6 includes a threaded sleeve 61, which is sleeved on the pipe head 41 and extends through the mounting hole 31. One end of the threaded sleeve 61 within the housing 1 is provided with an end face, one side of which abuts against the boss 42, and the other side of which covers the mounting hole 31. One end of the threaded sleeve 61 within the pipe box 2 is provided with a thread, and a nut 63 is mounted on the thread. The nut 63 covers the mounting hole 31, and a rubber sleeve 62 is provided between the threaded sleeve 61 and the mounting hole 31.

[0030] During installation, first sleeve the rubber sleeve 62 onto the outside of the threaded sleeve 61, then sleeve the threaded sleeve 61 onto the pipe head 41, with the end face of the threaded sleeve 61 abutting against the boss 42, and then press fit the tube sheet 3 onto all the heat exchange tubes 4;

[0031] After the threaded sleeve 61 extends out of the tube sheet 3, screw the nut 63 onto the threaded sleeve 61 until the left side of the end face of the threaded sleeve 61 contacts the tube sheet 3. At this time, the nut 63 cannot be tightened to the right, and the nut 63 and the end face of the threaded sleeve 61 squeeze the rubber sleeve 62 from both sides.

[0032] The mounting hole 31 is in the shape of a truncated cone, with the large diameter end of the truncated cone of the mounting hole 31 facing the side of the shell 1, so as to facilitate the passage of the heat exchange tube 4 and the pipe sealing assembly 6. When the pipe sealing assembly 6 is installed in place, the rubber sleeve 62 is squeezed between the hole wall of the mounting hole 31 and the outer wall of the threaded sleeve 61. Under the action of the squeezing force, the rubber sleeve 62 maintains an outward expansion thrust, thereby pressing each connection surface and improving the sealing performance.

[0033] At the same time, the rubber sleeve 62 is wrapped in the closed space formed by the threaded sleeve 61, the nut 63 and the mounting hole 31, preventing direct contact between the liquid in the heat exchanger and the rubber sleeve 62, thereby improving the sealing effect and extending the service life of the rubber sleeve 62.

[0034] One end of the nut 63 facing away from the tube sheet 3 is connected to a plurality of levers 64 , which replace the cooperation between the hexagonal nut and the wrench when the installation space is small, thereby facilitating the tightening of the nut 63 .

[0035] The cross-section of the sealing strip 51 is set in a "ji" shape. The arched part of the sealing strip 51 fits with the groove of the tube sheet 3. Both sides of the sealing strip 51 extend to both sides respectively and fit with the surface of the tube sheet 3. A pressing block 22 is arranged on one side of the partition plate 21 facing the tube sheet 3. The cross-section of the pressing block 22 is in a "mountain" shape. The pressing block 22 is correspondingly clamped with the sealing strip 51;

[0036] The special shapes of the pressing block 22 and the sealing strip 51 extend the area of the sealing surface and jointly form a labyrinth seal, improving the sealing effect;

[0037] At the same time, the pressing block 22 and the tube sheet 3 jointly wrap the sealing strip 51, reducing the direct impact of the liquid in the heat exchanger on the sealing strip 51, improving the sealing effect and prolonging the service life of the sealing strip 51.

[0038] Specifically, a boss 42 is arranged on the heat exchange tube 4. The threaded sleeve 61 of the pipe fitting sealing assembly 6 is sleeved on the pipe head 41, and one end of the threaded sleeve 61 abuts against the boss 42. A rubber sleeve 62 is arranged around the outer periphery of the threaded sleeve 61. The installation hole 31 is set in a frustum shape, and the large-diameter end of the installation hole 31 faces the side of the shell 1. During installation, the heat exchange tube 4 drives the threaded sleeve �1 and the rubber sleeve 62 thereon to pass through the installation hole 31. The threaded part of the threaded sleeve 61 passes through the installation hole 31, and the nut 63 is screwed tightly on the threaded sleeve 61 until the end face of the threaded sleeve 61 fits with the other side of the tube sheet 3, thus completing the installation. At this time, the threaded sleeve 61 and the installation hole 31 jointly squeeze the rubber sleeve 62, so that the rubber sleeve 62 always maintains an outward expansion and fits on the joint surface, having a better sealing effect compared with a single sealing ring;

[0039] The end face of the threaded sleeve 61 and the nut 63 respectively cover the installation hole 31 from both ends, reducing the contact between the rubber sleeve 62 and the liquid in the heat exchanger, prolonging the service life of the sealing structure and improving the sealing effect at the same time;

[0040] The pressing block 22 of the partition plate 21 covers the sealing strip 51. The cross-section of the sealing strip 51 is set in a "ji" shape, and the cross-section of the pressing block 22 is correspondingly set in a "mountain" shape. The pressing block 22 can be clamped with the sealing strip 51, thereby reducing the contact between the sealing strip 51 and the liquid in the tube box 2, prolonging the service life of the sealing strip 51, and at the same time, the pressing block 22 and the sealing strip 51 form a labyrinth seal, improving the sealing effect.

[0041] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0042] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0044] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. Sealing structure for a silicon carbide heat exchanger, comprising a housing (1), a tube sheet (2) and a tube plate (3), characterized in that: A partition (21) is provided in the tube box (2), and the partition (21) divides the tube box (2) into two chambers. A groove is provided on the tube sheet (3), and a sealing gasket (5) is installed in the groove. The tube box (2) and the tube sheet (3) are sealed by the sealing gasket (5). A sealing strip (51) is provided in the middle of the sealing gasket (5). The partition (21) and the sealing strip (51) are sealed. A plurality of mounting holes (31) are provided on the tube sheet (3), and heat exchange tubes (4) are installed in the mounting holes (31). A pipe sealing assembly (6) is provided between the heat exchange tubes (4) and the tube sheet (3).

2. The sealing structure for a silicon carbide heat exchanger according to claim 1, wherein: The heat exchange tube (4) is a "U"-shaped tube. Both ends of the heat exchange tube (4) are provided with a tube head (41). A boss (42) is provided between the tube head (41) and the heat exchange tube (4). The boss (42) is on the side of the tube sheet (3) facing the shell (1). The other end of the tube head (41) extends into the tube box (2) and is provided with a plurality of drainage grooves (43) along the axial direction.

3. The sealing structure for a silicon carbide heat exchanger according to claim 2, characterized in that: The pipe fitting sealing assembly (6) comprises a threaded sleeve (61), the threaded sleeve (61) being sleeved on the pipe head (41), the threaded sleeve (61) passing through the mounting hole (31), an end face being provided at one end of the threaded sleeve (61) in the housing (1), one side of the end face being in contact with the boss (42), and the other side of the end face being capable of covering the mounting hole (31), a thread being provided at one end of the threaded sleeve (61) in the pipe box (2), a nut (63) being mounted on the thread, the nut (63) being capable of covering the mounting hole (31), and a rubber sleeve (62) being provided between the threaded sleeve (61) and the mounting hole (31).

4. The sealing structure for a silicon carbide heat exchanger according to claim 3, characterized in that: The mounting hole (31) is in the shape of a truncated cone, with the large diameter end of the truncated cone of the mounting hole (31) facing one side of the housing (1).

5. The sealing structure for a silicon carbide heat exchanger according to claim 4, characterized in that: One end of the nut (63) facing away from the tube plate (3) is connected to a plurality of shifting rods (64).

6. The sealing structure for a silicon carbide heat exchanger according to claim 1, wherein: The cross section of the sealing strip (51) is arranged in the shape of a Chinese character "几". The arch of the sealing strip (51) fits in the groove of the tube sheet (3). The two sides of the sealing strip (51) extend to both sides and fit in the plate surface of the tube sheet (3). The partition (21) is provided with a pressing block (22) on the side facing the tube sheet (3). The cross section of the pressing block (22) is in the shape of a Chinese character "山". The pressing block (22) is correspondingly engaged with the sealing strip (51).

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