Diaphragm sealing disc for high-temperature and high-pressure heat exchanger

Abstract

The diaphragm sealing disc for the high-temperature and high-pressure heat exchanger comprises a sealing disc body, a telescopic groove is formed in one side of the sealing disc body, and a plurality of small wire grooves are formed in the bottom of the telescopic groove and one side of the sealing disc body. The sealing disc has the advantages that the axial telescopic function of the sealing disc under the high-temperature and high-pressure conditions is greatly improved, sealing disc deformation caused by thermal expansion difference is concentrated in the groove part, and the situation that a traditional sealing disc generates overlarge radial force after being subjected to high pressure and high heat, so that a welding seam is cracked is avoided.

Description

Technical Field

[0001] The utility model relates to the field of sealing discs, in particular to a diaphragm sealing disc for a high-temperature and high-pressure heat exchanger. Background Art

[0002] The sealing function of the sealing disc is mainly achieved by welding sealing. The front and back sides of the traditional sealing disc are both flat surfaces. When this traditional sealing disc is used in situations where there are thermal expansion differences among various components in the pipe box flange cover, pipe box flange or equipment, or under high-pressure conditions, the sealing disc is prone to cracking of the weld due to the radial force generated by the thermal expansion difference, or cracking of the weld due to the increase in flange spacing caused by high pressure, which ultimately causes leakage. Utility Model Content

[0003] The purpose of the present utility model is to provide a diaphragm sealing disc for a high-temperature and high-pressure heat exchanger to solve the problems raised in the above-mentioned background technology. It has the advantages of greatly improving the axial expansion and contraction function of the sealing disc under high-temperature and high-pressure conditions, concentrating the deformation of the sealing disc caused by the thermal expansion difference in the groove part, and avoiding the traditional sealing disc from generating excessive radial force and cracking the weld after being subjected to high pressure and high heat.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a diaphragm sealing disk for a high-temperature and high-pressure heat exchanger, comprising a sealing disk body, a telescopic groove being provided on one side of the sealing disk body, and a plurality of small wire grooves being provided on the bottom of the telescopic groove and one side of the sealing disk body.

[0005] Preferably, a hanging nut is integrally connected to the other side of the sealing disc body.

[0006] Preferably, a pipe box flange cover and a pipe box flange body are respectively provided on both sides of the sealing disc body, a screw is passed through the pipe box flange cover and the pipe box flange body, and a nut is threadedly connected to the screw.

[0007] Preferably, a heat exchanger shell is welded to one side of the pipe box flange body.

[0008] Preferably, a surfacing layer is provided between the sealing disc body and the pipe box flange body, and the surfacing layer extends to one side of the heat exchanger shell and the pipe box flange body.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] 1. The front end face of the sealing disc body is provided with a telescopic groove and several small wire grooves. The back side of the sealing disc body is a flat end face and a welded hanging nut structure. During installation, the front side of the sealing disc is hoisted toward the pipe box flange body. After the sealing disc is pressed and fixed to the pipe box flange body with special tools, the two are welded to form a seal. After welding is completed, the weld scar is polished flat. After passing the non-destructive test, the hanging nut on the back side of the sealing disc is polished off. The pipe box flange cover and the pipe box flange body are fastened with bolts to fix the sealing disc body between the two.

[0011] 2. The end face grooves on the sealing disc body are designed to accommodate differential thermal expansion under high temperature and high pressure conditions, allowing for axial expansion and contraction, thereby preventing excessive radial forces from causing weld cracking. The small wire grooves on the end faces of the sealing disc and the grooves provide segmented expansion and contraction, dispersing stress when thermal expansion differences are too large, thereby achieving a better axial expansion and contraction effect. After the sealing disc is welded to the pipe box flange, the pipe box flange cover is bolted to tightly secure the sealing disc to the pipe box flange body. The end face grooves and small wire grooves of this sealing disc significantly enhance its axial expansion and contraction capabilities under high temperature and high pressure conditions, concentrating deformation of the sealing disc caused by differential thermal expansion in the grooves. This avoids the problem of excessive radial forces that can cause weld cracking in traditional sealing discs subjected to high pressure and heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the structure of the sealing disc body;

[0013] Figure 2 for Figure 1 Cross-sectional view in the AA direction;

[0014] Figure 3 Schematic diagram of the working condition of the embodiment.

[0015] In the figure: 1. Sealing disc body; 2. Telescopic groove; 3. Small wire duct; 4. Lifting nut; 5. Pipe box flange cover; 6. Pipe box flange body; 7. Screw; 8. Nut; 9. Heat exchanger shell; 10. Welding layer. DETAILED DESCRIPTION

[0016] The following is a clear and complete description of 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 them. 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.

[0017] In the embodiment of the present utility model,

[0018] A diaphragm sealing disc for high temperature and high pressure heat exchanger, such as Figure 1-Figure 3As shown, it includes a sealing disc body 1, a telescopic groove 2 is provided on one side of the sealing disc body 1, and a plurality of small wire grooves 3 are provided on the bottom of the telescopic groove 2 and one side of the sealing disc body 1.

[0019] A lifting nut 4 is integrally connected to the other side of the sealing disc body 1 .

[0020] A pipe box flange cover 5 and a pipe box flange body 6 are respectively provided on both sides of the sealing disk body 1. A screw rod 7 is passed through the pipe box flange cover 5 and the pipe box flange body 6. The screw rod 7 is threadedly connected with a nut 8.

[0021] A heat exchanger shell 9 is welded to one side of the pipe box flange body 6 .

[0022] A surfacing layer 10 is provided between the sealing disc body 1 and the pipe box flange body 6 , and the surfacing layer 10 extends to one side of the heat exchanger shell 9 and the pipe box flange body 6 .

[0023] The sealing disc body 1 adopts a blind plate structure.

[0024] Working principle:

[0025] 1. The front end face of the sealing disc body 1 is provided with a telescopic groove 2 and several small wire grooves 3. The back side of the sealing disc body 1 is a flat end face and a welded hanging nut 4 structure. During installation, the front side of the sealing disc is hoisted toward the pipe box flange body 6. After the sealing disc is pressed and fixed to the pipe box flange body 6 with a special tool, the two are welded to form a seal. After welding is completed, the weld scar is polished flat. After passing the non-destructive test, the hanging nut 4 on the back side of the sealing disc is polished off. The pipe box flange cover 5 and the pipe box flange body 6 are fastened with bolts to fix the sealing disc body 1 between the two.

[0026] 2. The end face groove on the sealing disc body 1 is designed to accommodate thermal expansion differences under high temperature and high pressure conditions, allowing for axial expansion and contraction, thereby preventing excessive radial force from causing weld cracking. The small wire grooves 3 on the end faces of the sealing disc and the groove act to segment and disperse stress when thermal expansion differences are too large, thereby achieving a better axial expansion and contraction effect. After the sealing disc is welded to the pipe box flange, the pipe box flange cover 5 is bolted to tightly secure the sealing disc to the pipe box flange body 6. The design of the end face groove and small wire groove 3 of this sealing disc greatly enhances the axial expansion and contraction function of the sealing disc under high temperature and high pressure conditions, concentrating the deformation of the sealing disc caused by thermal expansion differences in the groove area, thus avoiding the problem of excessive radial force causing weld cracking in traditional sealing discs after being subjected to high pressure and high heat.

[0027] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A diaphragm sealing disc for a high-temperature and high-pressure heat exchanger, comprising a sealing disc body (1), characterized in that: A telescopic groove (2) is provided on one side of the sealing disc body (1), and a plurality of small wire grooves (3) are provided on the bottom of the telescopic groove (2) and on one side of the sealing disc body (1).

2. The diaphragm sealing disk for high-temperature and high-pressure heat exchangers according to claim 1, characterized in that: The other side of the sealing disc body (1) is integrally connected with a hanging nut (4).

3. The diaphragm sealing disk for a high-temperature and high-pressure heat exchanger according to claim 1, characterized in that: A pipe box flange cover (5) and a pipe box flange body (6) are respectively provided on both sides of the sealing disc body (1); a screw rod (7) is passed through the pipe box flange cover (5) and the pipe box flange body (6); and a nut (8) is threadedly connected to the screw rod (7).

4. The diaphragm sealing disk for a high-temperature and high-pressure heat exchanger according to claim 3, characterized in that: A heat exchanger shell (9) is welded to one side of the pipe box flange body (6).

5. The diaphragm sealing disk for a high-temperature and high-pressure heat exchanger according to claim 3, characterized in that: A surfacing layer (10) is provided between the sealing disc body (1) and the pipe box flange body (6), and the surfacing layer (10) extends to one side of the heat exchanger shell (9) and the pipe box flange body (6).

6. The diaphragm sealing disk for a high-temperature and high-pressure heat exchanger according to claim 3, characterized in that: The sealing disc body (1) adopts a blind plate structure.

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