Combined sealing structure for silicon carbide heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, and discloses a combined sealing structure for a silicon carbide heat exchanger, which comprises a tube plate, a sealing ring and a sealing ring. The heat exchange tube is inserted into the threaded tube hole; the compression nut is provided with an external thread and is matched with the threaded pipe hole in the pipe plate; and the combined sealing rings are arranged between the compression nuts and the tube plate. The O-shaped ring is indirectly extruded through deformation of the teflon sealing ring, the O-shaped ring is protected against damage caused by overlarge pressing force, the service life of the sealing assembly is prolonged, the usage amount of high-fluorine or perfluorine O-shaped rings is reduced under the same sealing effect, and therefore cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a combined sealing structure for a silicon carbide heat exchanger. Background Art

[0002] Most heat exchangers still use stainless steel heat exchange tubes, but in recent years, silicon carbide heat exchangers have been widely used in industries such as machinery, petrochemicals, building materials, and non-ferrous metal smelting. Silicon carbide heat exchange tubes have strong corrosion resistance, high thermal conductivity, high temperature and high pressure resistance, stable thermal shock resistance, and long service life, which has led to the widespread promotion of such heat exchangers. When using silicon carbide heat exchangers, special attention should be paid to the sealing between the heat exchange tubes and the tube sheet. Currently, there is no better technical advancement in the sealing method of this type of heat exchanger, and the sealing structure is relatively complex. Therefore, it is particularly important to have a structure that can better achieve a good seal between the silicon carbide heat exchange tubes and the tube sheet. Utility Model Content

[0003] In view of the above-mentioned technical deficiencies, the technical problem to be solved by the present invention is to provide a combined sealing structure for a silicon carbide heat exchanger, aiming to simplify the sealing structure between the heat exchange tube and the tube sheet while ensuring good sealing performance.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a combined sealing structure for a silicon carbide heat exchanger, comprising:

[0005] A tube sheet, wherein the tube sheet is provided with threaded tube holes;

[0006] a heat exchange tube, inserted into the threaded tube hole;

[0007] The compression nut with external thread matches the threaded pipe hole on the tube sheet;

[0008] Several combined sealing rings are arranged between the compression nut and the tube sheet.

[0009] Furthermore, the threaded pipe hole is stepped.

[0010] Furthermore, the heat exchange tube is made of silicon carbide.

[0011] Furthermore, the combined sealing ring comprises at least one polytetrafluoroethylene sealing ring (4) and at least two "O" rings.

[0012] Furthermore, the PTFE sealing ring is arranged between the compression nut and the tube sheet, and the two "O" rings are respectively located around the PTFE sealing ring and are in close contact with the outer wall of the heat exchange tube and the inner wall of the heat exchange tube hole to achieve sealing.

[0013] Furthermore, the locking nut is made of metal.

[0014] Furthermore, the locking nut is made of polytetrafluoroethylene.

[0015] The beneficial effects of the present invention are:

[0016] 1. The compression nut of the utility model does not directly squeeze the "O" ring, but squeezes the "O" ring through the deformation of the PTFE sealing ring. The PTFE sealing ring can play an intermediate protective role to avoid the "O" ring from being damaged and failing due to excessive nut tightening force, thereby greatly increasing the practical life of the combined sealing ring.

[0017] 2. Under the same sealing effect, the cross-sectional area of ​​the "O" ring required by the combined sealing ring is smaller than that of the pure "O" ring. The utility model can greatly reduce the use of high-fluorine or perfluorinated "O" rings under temperature-resistant and corrosion-resistant working conditions, thereby saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic structural diagram of a combined sealing structure for a silicon carbide heat exchanger provided in an embodiment of the present utility model.

[0020] Figure 2 This is a schematic diagram of the installation of a combined sealing ring.

[0021] Figure 3 It is a schematic diagram of the combined sealing ring structure.

[0022] Explanation of the accompanying reference numerals: 1. tube sheet; 2. heat exchange tube; 3. compression nut; 4. combined sealing ring; 41. PTFE sealing ring; 42. "O" ring. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0024] Example 1

[0025] like Figures 1-3 As shown, this embodiment provides a sealing structure for a silicon carbide heat exchanger tube sheet 1 and a heat exchange tube 2, including: Figure 1 As shown, a tube sheet 1 is provided with a threaded tube hole; a heat exchange tube 2 is inserted into the threaded tube hole; a clamping nut 3 with an external thread cooperates with the threaded tube hole on the tube sheet 1; a plurality of combined sealing rings 4 are provided between the clamping nut 3 and the tube sheet 1; wherein the threaded tube hole is stepped.

[0026] like Figure 2 and 3 As shown, the combined sealing ring 4 includes at least one PTFE sealing ring 41 and at least two O-rings 42. The PTFE sealing ring 41 is positioned between the compression nut 3 and the tube sheet 1. The two O-rings 42 are positioned around the PTFE sealing ring 41 and in close contact with the outer wall of the heat exchange tube 2 and the inner wall of the tube hole of the heat exchange tube 2 to achieve a seal. It should be noted that the PTFE sealing ring 41 can transmit the pressure of the compression nut 3 to the O-ring 42 through its own radial deformation, thereby causing the O-ring 42 to expand radially and form a seal. The compression nut 3 can be made of metal or PTFE.

[0027] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A combined sealing structure for a silicon carbide heat exchanger, characterized in that: include: A tube sheet, wherein the tube sheet is provided with threaded tube holes; a heat exchange tube, inserted into the threaded tube hole; The compression nut with external thread matches the threaded pipe hole on the tube sheet; Several combined sealing rings are arranged between the compression nut and the tube sheet.

2. A combined sealing structure for a silicon carbide heat exchanger according to claim 1, characterized in that: The threaded pipe hole is in a step shape.

3. The combined sealing structure for a silicon carbide heat exchanger according to claim 1, characterized in that: The heat exchange tube is made of silicon carbide.

4. The combined sealing structure for a silicon carbide heat exchanger according to claim 1, characterized in that: The combined sealing ring comprises at least one polytetrafluoroethylene sealing ring (4) and at least two "O" rings.

5. The combined sealing structure for a silicon carbide heat exchanger according to claim 4, characterized in that: The PTFE sealing ring is arranged between the compression nut and the tube sheet, and the two "O" rings are respectively located around the PTFE sealing ring and are in close contact with the outer wall of the heat exchange tube and the inner wall of the heat exchange tube hole to achieve sealing.

6. The combined sealing structure for a silicon carbide heat exchanger according to claim 1, characterized in that: The compression nut is made of metal.

7. The combined sealing structure for a silicon carbide heat exchanger according to claim 6, characterized in that: The clamping nut is also made of polytetrafluoroethylene.

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