A silicon carbide heat exchanger of self-contained seal structure
By employing an independent inner and outer tube sheet structure and sealing components in the silicon carbide heat exchanger, the problems of insufficient sealing performance and pressure resistance have been solved, resulting in a silicon carbide heat exchanger with high sealing performance and high mechanical strength.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUIZHOU LANXIN GRAPHITE MECHANICAL & ELECTRICAL EQUIP MFG
- Filing Date
- 2025-07-23
- Publication Date
- 2026-06-16
AI Technical Summary
The insufficient sealing performance and pressure resistance of existing silicon carbide heat exchangers limit their application in industrial production.
It adopts an independent inner tube sheet and outer tube sheet structure, and sets sealing components on both, including internal threaded holes, external threaded sleeves and flexible seals, combined with a conical structure and sealing gaskets to improve sealing performance and mechanical strength.
It significantly improves sealing and pressure resistance, enhances the mechanical strength and corrosion resistance of heat exchangers, and meets the needs of industrial production.
Smart Images
Figure CN224365402U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a heat exchanger, and more particularly to a silicon carbide heat exchanger with an independent sealing structure. Background Technology
[0002] A silicon carbide heat exchanger is a type of heat exchanger that uses silicon carbide material to make heat exchange tubes. Silicon carbide material has good thermal conductivity and mechanical properties, can withstand large mechanical and thermal stresses, and can resist corrosion from almost all chemicals. Therefore, silicon carbide heat exchangers are increasingly used in the field of heat exchangers.
[0003] However, silicon carbide materials are non-adhesive and non-weldable, so the core technology of silicon carbide heat exchangers lies in how to improve the sealing performance at the connection between the tube sheet and the heat exchange tubes.
[0004] Existing silicon carbide heat exchangers generally use a threaded compression sealing structure with PTFE tube sheets. This structure limits the sealing and pressure resistance of the heat exchanger due to the low strength of the PTFE threads, resulting in silicon carbide heat exchangers falling far short of industrial production needs. Utility Model Content
[0005] To address the aforementioned technical problems, this invention provides a silicon carbide heat exchanger with an independently sealed structure. The silicon carbide heat exchanger of this invention features excellent sealing performance, high mechanical strength, and good corrosion resistance; furthermore, it is characterized by its simple structure and reasonable design.
[0006] A silicon carbide heat exchanger with an independent sealing structure includes a heat exchanger shell, with a head at each end of the heat exchanger shell. An outer tube sheet and an inner tube sheet are arranged sequentially from the outside to the inside between the head and the heat exchanger shell. Multiple silicon carbide heat exchange tubes are arranged inside the heat exchanger shell. The two ends of the silicon carbide heat exchange tubes pass through the corresponding inner tube sheet and outer tube sheet in sequence and are in communication with the inner cavity of the head.
[0007] The outer tube sheet and the inner tube sheet are respectively provided with a first sealing component and a second sealing component at the positions where they contact the silicon carbide heat exchange tube.
[0008] This solution greatly improves sealing performance and pressure resistance by setting up independent inner and outer tube sheets, and installing one sealing component on each of the inner and outer tube sheets. It has the advantages of good sealing performance and high mechanical strength.
[0009] Preferably, in the aforementioned silicon carbide heat exchanger with independent sealing structure, the first sealing component includes a first internal threaded hole on the outer tube plate, the first internal threaded hole being coaxial with the silicon carbide heat exchange tube, a first external threaded sleeve being provided between the hole wall of the first internal threaded hole and the outer wall of the silicon carbide heat exchange tube, and a first flexible sealing element being sleeved on the silicon carbide heat exchange tube at the lower end of the first external threaded sleeve.
[0010] The sealing assembly of this solution is completed by using an internal threaded hole, an external threaded sleeve, and a flexible seal, which has the advantages of simple structure, good sealing performance, and reasonable design.
[0011] Preferably, in the aforementioned silicon carbide heat exchanger with an independent sealing structure, the outer tube sheet and the first external threaded sleeve are made of fiber-reinforced PTFE.
[0012] The outer tube sheet and the first external threaded sleeve of this design are made of fiber-reinforced PTFE, which enhances the corrosion resistance of the heat exchanger and has the characteristics of good corrosion resistance.
[0013] Preferably, in the aforementioned silicon carbide heat exchanger with independent sealing structure, the bottom of the first internal threaded hole is provided with a first conical bottom, and the first flexible seal includes a first O-ring located on the upper side and a first conical ring located on the lower side.
[0014] This solution achieves better sealing by setting a tapered bottom at the bottom of the internal threaded hole and using an O-ring and a tapered ring in combination for the flexible seal.
[0015] Preferably, in the aforementioned silicon carbide heat exchanger with independent sealing structure, the first external threaded sleeve is provided with a convex hole with a convex cross-section; and the end of the silicon carbide heat exchange tube is provided with a convex end with a convex cross-section.
[0016] This solution improves sealing performance and mechanical strength by setting a convex hole in the first external threaded sleeve and a convex end at the end of the silicon carbide heat exchange tube, thereby clamping the silicon carbide heat exchange tube and preventing its displacement.
[0017] Preferably, in the aforementioned silicon carbide heat exchanger with independent sealing structure, the second sealing component includes a second internal threaded hole on the inner tube plate, the second internal threaded hole being coaxial with the silicon carbide heat exchange tube, a second external threaded sleeve being provided between the hole wall of the second internal threaded hole and the outer wall of the silicon carbide heat exchange tube, and a second flexible sealing element being sleeved on the silicon carbide heat exchange tube at the lower end of the second external threaded sleeve.
[0018] Preferably, in the aforementioned silicon carbide heat exchanger with an independent sealing structure, the inner tube sheet and the second external threaded sleeve are made of steel.
[0019] The inner tube sheet and the second external threaded sleeve in this design are made of steel, which greatly improves the pressure resistance of the heat exchanger.
[0020] Preferably, in the aforementioned silicon carbide heat exchanger with independent sealing structure, the bottom of the second internal threaded hole is provided with a second conical bottom, and the second flexible seal includes a second O-ring located on the upper side and a second conical ring located on the lower side.
[0021] Preferably, in the aforementioned silicon carbide heat exchanger with an independent sealing structure, a sealing gasket is provided between the connecting surfaces of the end cap, outer tube sheet, and inner tube sheet.
[0022] This solution further improves the heat exchanger's sealing performance by installing sealing gaskets between the connection surfaces of the end caps, outer tube sheet, and inner tube sheet.
[0023] 1. This utility model greatly improves the sealing performance and pressure resistance by setting independent inner tube plate and outer tube plate, and setting one sealing component on each inner tube plate and outer tube plate. It has the advantages of good sealing performance and high mechanical strength.
[0024] 2. The sealing assembly of this utility model is completed by the combination of an internal threaded hole, an external threaded sleeve and a flexible sealing element, which has the advantages of simple structure, good sealing performance and reasonable design.
[0025] 3. The outer tube sheet and the first external threaded sleeve of this utility model are made of fiber-reinforced PTFE material, which enhances the corrosion resistance of the heat exchanger and has the advantage of good corrosion resistance.
[0026] 4. This utility model has better sealing performance by setting a conical bottom at the bottom of the internal threaded hole and using an O-ring and a conical ring to seal the flexible seal.
[0027] 5. This utility model improves sealing performance and mechanical strength by providing a convex hole in the first external threaded sleeve and a convex end at the end of the silicon carbide heat exchange tube, thereby clamping the silicon carbide heat exchange tube and preventing its displacement.
[0028] 6. The inner tube plate and the second external threaded sleeve of this utility model are made of steel, which greatly improves the pressure resistance of the heat exchanger.
[0029] 7. This utility model further improves the sealing performance of the heat exchanger by setting a sealing gasket between the connection surfaces of the end cap, outer tube sheet and inner tube sheet. Attached Figure Description
[0030] Appendix Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0031] Appendix Figure 2 For the appendix Figure 1 A schematic diagram of a partial structure;
[0032] Appendix Figure 3 For the appendix Figure 2 A schematic diagram of a partial structure;
[0033] Appendix Figure 4 For the appendix Figure 2 A schematic diagram of a partial structure;
[0034] Appendix Figure 5This is a schematic diagram of the structure of the first and second conical rings.
[0035] Explanation of reference numerals in the attached drawings: 1-Heat exchanger shell, 2-End cap, 3-Outer tube sheet, 4-Inner tube sheet, 5-Silicon carbide heat exchange tube, 6-Second sealing assembly, 61-Second internal threaded hole, 62-Second O-ring, 63-Second conical ring, 64-Second conical bottom, 65-Second external threaded sleeve, 7-First sealing assembly, 71-First internal threaded hole, 72-First O-ring, 73-First conical ring, 74-First external threaded sleeve, 75-Convex end, 76-Convex hole, 77-First conical bottom, 8-Sealing gasket. Detailed Implementation
[0036] The present invention will be further described below with reference to the embodiments, but this should not be construed as limiting the present invention.
[0037] Embodiments of this utility model
[0038] A silicon carbide heat exchanger with an independent sealed structure, as shown in the attached image. Figure 1-5 As shown, it includes a heat exchanger shell 1, with a head 2 at each end of the heat exchanger shell 1. An outer tube sheet 3 and an inner tube sheet 4 are arranged between the head 2 and the heat exchanger shell 1 from the outside to the inside. Multiple silicon carbide heat exchange tubes 5 are arranged inside the heat exchanger shell 1. The two ends of the silicon carbide heat exchange tubes 5 pass through the inner tube sheet 4 and the outer tube sheet 3 at the corresponding ends in sequence, and are connected to the inner cavity of the head 2.
[0039] The outer tube sheet 3 and the inner tube sheet 4 are respectively provided with a first sealing component 7 and a second sealing component 6 at the positions where they contact the silicon carbide heat exchange tube 5.
[0040] In this embodiment, the outer tube sheet 3, the inner tube sheet 4, the first sealing component 7, and the second sealing component 6 are independent structures and are assembled separately. The first sealing component 7 is used to seal the gap between the outer tube sheet 3 and the silicon carbide heat exchange tube 5 to prevent material leakage in the tube side; while the second sealing component 6 is used to seal the gap between the inner tube sheet 4 and the silicon carbide heat exchange tube 5 to prevent steam leakage in the shell side.
[0041] Further implementation, for example, is attached. Figure 1-5 As shown, the first sealing assembly 7 includes a first internal threaded hole 71 provided on the outer tube plate 3. The first internal threaded hole 71 is coaxial with the silicon carbide heat exchange tube 5. A first external threaded sleeve 74 is provided between the hole wall of the first internal threaded hole 71 and the outer wall of the silicon carbide heat exchange tube 5. A first flexible sealing element is sleeved on the silicon carbide heat exchange tube 5 at the lower end of the first external threaded sleeve 74.
[0042] In this embodiment, the first sealing component 7 is installed by first inserting the silicon carbide heat exchange tube 5 into the first internal threaded hole 71, then putting the first flexible sealing element on the silicon carbide heat exchange tube 5, and then putting the first external threaded sleeve 74 on the silicon carbide heat exchange tube 5 and screwing it into the first internal threaded hole 71. The first flexible sealing element is then pressed tightly by the first external threaded sleeve 74.
[0043] Further implementation, for example, is attached. Figure 1-5 As shown, the outer tube sheet 3 and the first external threaded sleeve 74 are made of fiber-reinforced PTFE. Fiber-reinforced PTFE has strong corrosion resistance, ensuring that the outer tube sheet 3 and the first external threaded sleeve 74 are not corroded when in contact with the tube-side material.
[0044] Further implementation, for example, is attached. Figure 1-5 As shown, the bottom of the first internal threaded hole 71 is provided with a first conical bottom 77, and the first flexible seal includes a first O-ring 72 located on the upper side and a first conical ring 73 located on the lower side.
[0045] Further implementation, for example, is attached. Figure 1-5 As shown, the first external threaded sleeve 74 has a convex hole 76 with a convex cross-section; the end of the silicon carbide heat exchange tube 5 has a convex end 75 with a convex cross-section. The convex hole 76 and the convex end 75 cooperate with each other, and the first external threaded sleeve 74 presses the silicon carbide heat exchange tube 5 tightly to prevent it from slipping.
[0046] Further implementation, for example, is attached. Figure 1-5 As shown, the second sealing assembly 6 includes a second internal threaded hole 61 provided on the inner tube plate 4. The second internal threaded hole 61 is coaxial with the silicon carbide heat exchange tube 5. A second external threaded sleeve 65 is provided between the hole wall of the second internal threaded hole 61 and the outer wall of the silicon carbide heat exchange tube 5. A second flexible sealing element is sleeved on the silicon carbide heat exchange tube 5 at the lower end of the second external threaded sleeve 65.
[0047] The assembly method of the second sealing component 6 in this embodiment is the same as that of the first sealing component 7.
[0048] Further implementation, for example, is attached. Figure 1-5 As shown, the inner tube plate 4 and the second external threaded sleeve 65 are made of steel.
[0049] The inner tube plate 4 and the second external threaded sleeve 65 are made of steel, which can greatly improve the tightening ability of the second sealing component 6, thereby enhancing its pressure resistance.
[0050] Further implementation, for example, is attached. Figure 1-5 As shown, the bottom of the second internal threaded hole 61 is provided with a second conical bottom 64, and the second flexible seal includes a second O-ring 62 located on the upper side and a second conical ring 63 located on the lower side.
[0051] Further implementation, for example, is attached. Figure 1-5 As shown, a sealing gasket 8 is provided between the connecting surfaces of the end cap 2, the outer tube sheet 3, and the inner tube sheet 4. In this embodiment, the sealing gasket 8 is a conventional sealing gasket, which improves the sealing performance between the connecting surfaces of the end cap 2, the outer tube sheet 3, and the inner tube sheet 4.
[0052] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.
Claims
1. A silicon carbide heat exchanger with an independently sealed structure, characterized in that: The heat exchanger includes a heat exchanger shell (1), and a head (2) is provided at each end of the heat exchanger shell (1). An outer tube sheet (3) and an inner tube sheet (4) are provided between the head (2) and the heat exchanger shell (1) from the outside to the inside. Multiple silicon carbide heat exchange tubes (5) are provided inside the heat exchanger shell (1). The two ends of the silicon carbide heat exchange tubes (5) pass through the inner tube sheet (4) and the outer tube sheet (3) at the corresponding ends in sequence, and are connected to the inner cavity of the head (2). The outer tube sheet (3) and inner tube sheet (4) are respectively provided with a first sealing component (7) and a second sealing component (6) at the positions where they contact the silicon carbide heat exchange tube (5).
2. The silicon carbide heat exchanger with an independently sealed structure according to claim 1, characterized in that: The first sealing assembly (7) includes a first internal threaded hole (71) provided on the outer tube plate (3), the first internal threaded hole (71) is coaxial with the silicon carbide heat exchange tube (5), a first external threaded sleeve (74) is provided between the hole wall of the first internal threaded hole (71) and the outer wall of the silicon carbide heat exchange tube (5), and a first flexible seal is sleeved on the silicon carbide heat exchange tube (5) at the lower end of the first external threaded sleeve (74).
3. The silicon carbide heat exchanger with an independently sealed structure according to claim 2, characterized in that: The outer tube sheet (3) and the first external threaded sleeve (74) are made of fiber-reinforced PTFE.
4. The silicon carbide heat exchanger with an independently sealed structure according to claim 2, characterized in that: The bottom of the first internal threaded hole (71) is provided with a first conical bottom (77), and the first flexible seal includes a first O-ring (72) located on the upper side and a first conical ring (73) located on the lower side.
5. The silicon carbide heat exchanger with an independently sealed structure according to claim 2, characterized in that: The first external threaded sleeve (74) has a convex hole (76) with a convex cross section; the end of the silicon carbide heat exchange tube (5) has a convex end (75) with a convex cross section.
6. The silicon carbide heat exchanger with an independently sealed structure according to claim 1, characterized in that: The second sealing assembly (6) includes a second internal threaded hole (61) provided on the inner tube plate (4). The second internal threaded hole (61) is coaxial with the silicon carbide heat exchange tube (5). A second external threaded sleeve (65) is provided between the hole wall of the second internal threaded hole (61) and the outer wall of the silicon carbide heat exchange tube (5). A second flexible seal is sleeved on the silicon carbide heat exchange tube (5) at the lower end of the second external threaded sleeve (65).
7. The silicon carbide heat exchanger with an independently sealed structure according to claim 6, characterized in that: The inner tube plate (4) and the second external threaded sleeve (65) are made of steel.
8. The silicon carbide heat exchanger with an independently sealed structure according to claim 6, characterized in that: The bottom of the second internal threaded hole (61) is provided with a second conical bottom (64), and the second flexible seal includes a second O-ring (62) located on the upper side and a second conical ring (63) located on the lower side.
9. The silicon carbide heat exchanger with an independently sealed structure according to claim 1, characterized in that: A sealing gasket (8) is provided between the connecting surfaces of the end cap (2), the outer tube sheet (3) and the inner tube sheet (4).