A sealing device

Abstract

The present invention discloses a sealing device, comprising a first flange, a second flange and a sealing gasket, wherein the sealing gasket comprises a first ring and a second ring coaxially stacked, and a stress release ring welded and fixed between the inner circumference of the first ring and the inner circumference of the second ring and capable of elastic deformation in the radial direction. During operation of the sealing device, when the flanges on both sides of the sealing gasket produce a radial displacement difference due to different operating temperature fields, the first ring and the second ring can be always sealed through the deformation of the stress release ring, so that the first sealing ring and the second sealing ring can always move synchronously with the sealed surfaces they contact, the contact is relatively static, and there is no wear, so that the sealing surfaces will not rub against each other to damage the sealing rings, thereby ensuring that the seal remains effective.

Description

Technical Field

[0001] The invention relates to the field of sealing, and in particular to a sealing device. Background Art

[0002] In the fields of nuclear power, petrochemicals, food, etc., traditional flange seals mainly use double-cone ring gaskets, octagonal (elliptical) gaskets, metal ring gaskets or metal spiral wound gaskets. Due to the different temperatures on both sides of the sealed flange, the flanges on both sides of the seal deform asynchronously at different temperatures, and the flange sealing surfaces produce a relative displacement difference in the radial direction, which poses a risk of damage to the seal or a decrease in sealing stress, leading to seal failure. Summary of the invention

[0003] The object of the present invention is to provide a sealing device to compensate for the relative displacement difference of the flange sealing surface in the radial direction and ensure the reliability of the sealing.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a sealing device, comprising a first flange having a first flange surface, a second flange having a second flange surface, and a sealing gasket used for sealing connection between the first flange surface and the second flange surface, the first flange is provided with a first mounting groove, the second flange is provided with a second mounting groove, the sealing gasket comprises a first ring and a second ring coaxially stacked, the outer shaft end of the first ring is provided with a first sealing ring, the outer shaft end of the second ring is provided with a second sealing ring, the outer shaft end of the first ring is matchedly embedded in the first mounting groove, and the outer shaft end of the second ring is matchedly embedded in the second mounting groove;

[0005] The sealing gasket also includes a stress release ring capable of elastic deformation in the radial direction. The axial ends on both sides of the stress release ring are respectively welded and fixed to the first ring and the second ring in the circumferential direction. A gap is arranged between the outer peripheral surface of the stress release ring and the circumferential groove wall of the first arc groove.

[0006] Preferably, the longitudinal section of the stress release ring is in the shape of a curved thin sheet.

[0007] As a preferred embodiment, the longitudinal section of the stress release ring is C-shaped arched radially outward, or C-shaped arched radially inward, or W-shaped with an opening facing radially inward or radially outward, or corrugated.

[0008] Preferably, a first arc-shaped groove is provided on the inner circumference of the first ring, and a second arc-shaped groove is provided on the inner circumference of the second ring, the first arc-shaped groove and the second arc-shaped groove cooperate with each other to form a receiving space, the stress release ring is fully or partially received in the receiving space, and there is a gap between the outer circumferential surface of the stress release ring and the circumferential groove wall of the first arc-shaped groove.

[0009] Furthermore, the longitudinal section of the stress release ring is C-shaped and arches outward in the radial direction, and the outer peripheral surface of the stress release ring is in contact with the circumferential groove wall of the second arc-shaped groove.

[0010] Preferably, one of the inner axial end portions of the first ring and the inner axial end portions of the second ring is provided with an annular boss, and the other is provided with an annular groove, the radial thickness of the annular boss is smaller than the radial width of the annular groove, and the annular boss is correspondingly inserted into the annular groove.

[0011] Further, the annular boss is arranged on the first ring, the annular groove is arranged on the second ring, and a gap is provided between the inner peripheral surface of the annular boss and the inner peripheral wall of the annular groove;

[0012] Alternatively, the annular groove is arranged on the first ring, the annular boss is arranged on the second ring, and a gap is provided between the outer peripheral surface of the annular boss and the outer peripheral wall of the annular groove.

[0013] Furthermore, an inner sealing ring is also provided on the annular boss, and the inner sealing ring is sealedly connected to the bottom surface of the annular groove.

[0014] Preferably, the sealing gasket also includes a leak detection ring, and the axial ends on both sides of the leak detection ring are respectively welded and fixed to the outer peripheral portion of the first ring and the outer peripheral portion of the second ring along the circumferential direction, and a closed leak detection chamber is formed between the first ring, the second ring, the stress release ring and the leak detection ring, and the leak detection ring is also connected to a leak detection tube connected to the leak detection chamber.

[0015] Further, a first outer sealing ring is provided at the outer axial end of the first ring, the first outer sealing ring is located radially outside the first sealing ring, a first leak detection hole is provided on the first ring and passes through in the axial direction, and the first leak detection hole is radially located between the first sealing ring and the first outer sealing ring; a second outer sealing ring is provided at the outer axial end of the second ring, the second outer sealing ring is located radially outside the second sealing ring, a second leak detection hole is provided on the second ring and passes through in the axial direction, and the second leak detection hole is radially located between the second sealing ring and the second outer sealing ring.

[0016] Due to the application of the above technical scheme, the present invention has the following advantages compared with the prior art: during the operation of the sealing device of the present invention, when the flanges on both sides of the sealing gasket produce radial displacement differences due to different working temperature fields, the first ring and the second ring can be always sealed through the deformation of the stress release ring, so that the first sealing ring and the second sealing ring can always move synchronously with their respective sealed surfaces, the contact is relatively static, and there is no wear, so that the sealing surfaces will not rub against each other to damage the sealing rings, thereby ensuring that the seal remains effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 is a longitudinal sectional schematic diagram of a sealing gasket according to Example 1 of the present invention;

[0018] Attached Figure 2 To adopt the Figure 1 A longitudinal sectional schematic diagram of a sealing device of a sealing gasket, wherein the sealing gasket has not yet been compressed;

[0019] Attached Figure 3 For attachment Figure 2 A longitudinal sectional schematic diagram of a sealing device in which a sealing gasket is compressed and radially displaced;

[0020] Attached Figure 4 is a longitudinal sectional schematic diagram of a sealing gasket according to Example 2 of the present invention;

[0021] Attached Figure 5 To adopt the Figure 4 A longitudinal sectional schematic diagram of a sealing device of a sealing gasket, wherein the sealing gasket is compressed and has not yet undergone radial displacement;

[0022] Attached Figure 6 is a longitudinal sectional schematic diagram of a sealing gasket according to Example 3 of the present invention;

[0023] Attached Figure 7 is a longitudinal sectional schematic diagram of a sealing gasket according to Example 4 of the present invention;

[0024] Attached Figure 8 To adopt the Figure 7 A longitudinal sectional schematic diagram of a sealing device of a sealing gasket, wherein the sealing gasket is compressed and has not yet undergone radial displacement;

[0025] Attached Fig. 9 is a longitudinal sectional schematic diagram of a sealing gasket according to Example 5 of the present invention;

[0026] Attached Fig.10 To adopt the Fig. 9 A longitudinal sectional schematic diagram of a sealing device of a sealing gasket, wherein the sealing gasket is compressed and has not yet undergone radial displacement;

[0027] Attached Fig.11is a longitudinal sectional schematic diagram of a sealing gasket according to Example 6 of the present invention;

[0028] Attached Fig.12 is a longitudinal sectional schematic diagram of a sealing gasket according to Example 7 of the present invention;

[0029] Attached Fig.13 is a schematic longitudinal section diagram of a sealing gasket according to Example 8 of the present invention;

[0030] Attached Fig.14 is a longitudinal sectional schematic diagram of a sealing gasket according to Example 9 of the present invention;

[0031] Wherein: 100, first flange; 101, first flange surface; 102, first mounting groove;

[0032] 200, second flange; 201, second flange surface; 202, second mounting groove;

[0033] 300, sealing gasket; 1, first ring; 11, annular boss; 12, annular groove; 13, first leak detection hole; 14, first arcuate groove; 2, second ring; 21, annular groove; 22, second leak detection hole; 23, second arcuate groove; 3, first sealing ring; 4, second sealing ring; 5, stress relief ring; 6, 6', leak detection ring; 7, leak guide tube; 8, inner sealing ring; 9, first outer sealing ring; 10, second outer sealing ring. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] See also Figure 1 The sealing gasket shown in the figure comprises a first ring 1 and a second ring 2 which are coaxially stacked, a first sealing ring 3 is arranged at the outer shaft end of the first ring 1, and a second sealing ring 4 is arranged at the outer shaft end of the second ring 2. The first sealing ring 3 and the second sealing ring 4 can be made of metal or non-metal materials, and can be metal rings, packing rings, O-rings, etc. The sealing gasket is sealed with the flange surfaces of the two flanges through the first sealing ring 3 and the second sealing ring 4. Here, the shaft end where the first ring 1 and the second ring 2 are matched and connected with the flange is called the outer shaft end, and the shaft end where the first ring 1 and the second ring 2 are in contact with each other is called the inner shaft end.

[0037] The sealing gasket also includes a stress release ring 5 that can be elastically deformed in the radial direction, and the longitudinal section of the stress release ring 5 is in the shape of a curved thin sheet. In this embodiment, the longitudinal section of the stress release ring 5 is in the shape of a C that arches outward in the radial direction, and its outer peripheral surface is an arc surface. The stress release ring 5 is coaxially arranged with the first ring 1 and the second ring 2, and the inner diameters of the three are the same. The inner peripheral portion of the first ring 1 is provided with a first arc groove 14, and the inner peripheral portion of the second ring 2 is provided with a second arc groove (not shown in the figure). The first arc groove 14 and the second arc groove are both semicircular arc grooves, which cooperate with each other to form a receiving space for accommodating the stress release ring 5, and the stress release ring 5 is completely accommodated in the above-mentioned receiving space. The axial ends on both sides of the stress release ring 5 are welded and fixed to the first ring 1 and the second ring 2 in the circumferential direction, so that the gap between the first ring 1 and the second ring 2 is closed by the stress release ring 5 at the inner peripheral portion.

[0038] There is a gap between the outer peripheral surface of the stress release ring 5 and the circumferential groove wall of the first arc-shaped groove 14. Figure 1 As shown at A in the middle. As a preferred mode, the gap is set to gradually increase from the outside to the inside along the axial direction of the first ring 1. The outer peripheral surface of the stress release ring 5 and the circumferential groove wall of the second arc groove are set to be in contact with each other. In this way, when the second ring 2 has a displacement difference radially outward relative to the first ring 1, the stress release ring 5 is deformed, and one axial end of the stress release ring 5 is against the second arc groove, which can withstand higher pressure, and the other axial end is deformed. The above gap provides space for the stress release ring 5 to release deformation.

[0039] See also Figure 1 As shown, in this embodiment, an annular boss 11 is provided on the inner shaft end of the first ring 1, and an annular groove 21 is provided on the inner shaft end of the second ring 2. The radial thickness of the annular boss 11 is smaller than the radial width of the annular groove 21. The annular boss 11 is correspondingly inserted into the annular groove 21. Figure 1 The gap between the annular boss 11 and the annular groove 21 is shown at B in the middle, which enables the annular boss 11 to move in the annular groove 21 when the second ring 2 has a displacement difference in the radial direction relative to the first ring 1, that is, to reserve radial deformation compensation space when the second ring 2 has a displacement difference in the radial direction relative to the first ring 1. When setting, when the sealing gasket is not in use, it is only necessary to ensure that there is a gap between the inner peripheral surface of the annular boss 11 and the inner peripheral wall of the annular groove 21. The gap should not be less than the displacement difference between the second ring 2 and the first ring 1 in the radial direction. When setting specifically, the above gap value is determined based on multiple factors such as the material used by the sealing gasket and the working environment used. In some other embodiments, the annular groove can also be set on the first ring 1 and the annular boss can be set on the second ring 2. In this case, it is necessary to ensure that there is a gap between the outer peripheral surface of the annular boss and the outer peripheral wall of the annular groove.

[0040] In this embodiment, the height of the annular boss 11 is greater than the depth of the annular groove 21 , so that there is a gap between the inner axial end surface of the first ring 1 and the inner axial end surface of the second ring 2 .

[0041] See also Figure 2 , Figure 3 The sealing device shown includes a first flange 100 having a first flange surface 101, a second flange 200 having a second flange surface 201, and a sealing gasket 300 for sealing the first flange surface 101 and the second flange surface 201. The first flange 100 is provided with a first mounting groove 102, and the second flange 200 is provided with a second mounting groove 202.

[0042] The first flange 100, the second flange 200 and the sealing gasket 300 are coaxially arranged, and the working temperature field of the second flange 200 is higher than the working temperature field of the first flange 100. The first flange 100 and the second flange 200 are axially compressed and connected by bolts, and the sealing gasket 300 is compressed between the first flange 100 and the second flange 200, wherein the outer axial end of the first ring 1 is cooperatively embedded in the first mounting groove 102, and the outer axial end of the second ring 2 is cooperatively embedded in the second mounting groove 202, and a seal is formed between the first sealing ring 3 and the bottom wall of the first mounting groove 102, and a seal is formed between the second sealing ring 4 and the bottom wall of the second mounting groove 202.

[0043] After the sealing gasket 300 is tightened, the first ring 1 and the second ring 2 are positioned and constrained in the first mounting groove 102 and the second mounting groove 202 respectively, and the axial outer end faces of the first ring 1 and the second ring 2 are in bearing contact with the flange surfaces of the two flanges respectively, limiting the compression amount of the first sealing ring 3 and the second sealing ring 4, so that the sealing stress of each sealing ring is constant.

[0044] When the sealing device is in working state, when the flanges on both sides of the sealing gasket 300 have radial displacement difference due to temperature difference, the first mounting groove 102 and the second mounting groove 202 move asynchronously in the radial direction. Figure 3 As shown in a, the deformation of the stress release ring 5 can keep the first ring 1 and the second ring 2 sealed at all times. The first ring 1 located on the low temperature side is constrained in the first mounting groove 102 and moves radially with the first flange 100, and the second ring 2 located on the high temperature side is constrained in the second mounting groove 202 and moves radially with the second flange 200, so that the first sealing ring 3, the second sealing ring 4 and their respective contacting sealed surfaces always move synchronously, the contact is relatively static, and there is no wear, so that the sealing surfaces will not rub against each other and damage the sealing rings, thereby keeping the seal effective. The sealing gasket of this embodiment is particularly suitable for high-pressure working conditions.

[0045] Example 2

[0046] See also Figure 4 The sealing gasket shown is different from the sealing gasket of Example 1 mainly in that, in this embodiment, the sealing gasket also includes a leak detection ring 6, and the longitudinal section of the leak detection ring 6 is a C-shape convex outward. The axial ends of both sides of the leak detection ring 6 are welded and fixed to the outer peripheral part of the first ring 1 and the outer peripheral part of the second ring 2 along the circumferential direction, and a closed leak detection chamber is formed between the first ring 1, the second ring 2, the stress release ring 5 and the leak detection ring 6. The leak detection ring 6 is also fixedly connected to a leak guide pipe 7 connected to the above-mentioned leak detection chamber. In this way, the weld of the stress release ring 5 can be checked for leaks, so that a timely alarm can be issued when the weld fails. A sealing device using the sealing gasket is as follows Figure 5 shown.

[0047] Example 3

[0048] See also Figure 6 The sealing gasket shown is different from the sealing gasket of Example 2 mainly in that, in this embodiment, the longitudinal section of the leakage detection ring 6' in the sealing gasket is inwardly concave C-shape.

[0049] Example 4

[0050] See also Figure 7 The main difference between the sealing gasket shown in the embodiment 2 and the sealing gasket of the embodiment 2 is that in the embodiment, an annular groove 12 is further provided on the annular boss 11, and an inner sealing ring 8 is provided in the annular groove 12. The inner sealing ring 8 is sealed and connected to the bottom surface of the annular groove 21. In this way, once the weld at the stress release ring 5 fails, a second sealing barrier can be provided between the first ring 1 and the second ring 2. The sealing device using the sealing gasket is as follows: Figure 8 shown.

[0051] Example 5

[0052] See also Fig. 9 The sealing gasket shown is different from the sealing gasket of Example 4 mainly in that, in this embodiment, a first outer sealing ring 9 is further provided on the outer axial end of the first ring 1, and the first outer sealing ring 9 is located radially outside the first sealing ring 3. The first ring 1 is also provided with a first leak detection hole 13 extending axially therethrough, and the first leak detection hole 13 is radially located between the first sealing ring 3 and the first outer sealing ring 9; a second outer sealing ring 10 is further provided on the outer axial end of the second ring 2, and the second outer sealing ring 10 is located radially outside the second sealing ring 4. The second ring 2 is also provided with a second leak detection hole 22 extending axially therethrough, and the second leak detection hole 22 is radially located between the second sealing ring 4 and the second outer sealing ring 10. In this way, leakage detection and monitoring of the overall sealing condition can be performed. A sealing device using the sealing gasket is as follows: Fig.10 shown.

[0053] Example 6

[0054] See also Fig.11 The sealing gasket shown in the embodiment is mainly different from the sealing gasket of embodiment 2 in that, in the embodiment, the longitudinal section of the stress release ring 5 is a C-shape arched radially inward, and the axial ends on both sides are welded and fixed to the inner peripheral surface of the first ring 1 and the inner peripheral surface of the second ring 2, respectively, and the main body is completely located on the inner side of the first ring 1 and the second ring 2. Different from embodiments 1 to 5, the sealing gasket of the embodiment is suitable for medium and low pressure working environments.

[0055] Example 7

[0056] See also Fig.12 The sealing gasket shown in the embodiment is mainly different from the sealing gasket of the embodiment 2 in that, in the embodiment, the longitudinal cross section of the stress release ring 5 is corrugated, and the axial ends on both sides are respectively welded and fixed to the inner peripheral surface of the first ring 1 and the inner peripheral surface of the second ring 2, and the middle of the stress release ring 5 has a curved portion that arches outward in the radial direction, and the curved portion is accommodated in the accommodation space formed by the first arc groove 14 and the second arc groove 23. The sealing gasket of the embodiment is suitable for medium and low pressure working conditions.

[0057] Example 8

[0058] See also Fig.13 The main difference between the sealing gasket of this embodiment and the sealing gasket of embodiment 2 is that in this embodiment, the longitudinal cross section of the stress release ring 5 is W-shaped with the opening facing radially inward, and the stress release ring 5 is completely accommodated in the accommodation space formed by the first arc groove 14 and the second arc groove 23. The sealing gasket of this embodiment is suitable for medium and low pressure working environments.

[0059] Example 9

[0060] See also Fig.14 The main difference between the sealing gasket of this embodiment and the sealing gasket of embodiment 8 is that in this embodiment, the longitudinal section of the stress release ring 5 is W-shaped with the opening facing radially outward, and the axial ends on both sides are welded and fixed to the inner circumference of the first ring 1 and the inner circumference of the second ring 2, respectively, and the main body is completely located on the inner side of the first ring 1 and the second ring 2. The sealing gasket of this embodiment is suitable for medium and low pressure working environments.

[0061] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing device, comprising a first flange having a first flange surface, a second flange having a second flange surface, and a sealing gasket for sealingly connecting the first flange surface and the second flange surface, characterized in that: The first flange is provided with a first mounting groove, the second flange is provided with a second mounting groove, the sealing gasket comprises a first ring and a second ring which are coaxially stacked, the outer shaft end of the first ring is provided with a first sealing ring, the outer shaft end of the second ring is provided with a second sealing ring, the outer shaft end of the first ring is cooperatively embedded in the first mounting groove, and the outer shaft end of the second ring is cooperatively embedded in the second mounting groove; the sealing gasket also comprises a stress release ring which can be elastically deformed in the radial direction, the shaft ends on both sides of the stress release ring are respectively welded and fixed on the first ring and the second ring along the circumferential direction, the outer peripheral surface of the stress release ring and the circumferential groove wall of the first arc groove are arranged with a gap, wherein the inner peripheral part of the first ring is provided with a first arc groove, the inner peripheral part of the second ring is provided with a second arc groove, the first arc groove and the second arc groove cooperate with each other to form a receiving space, the stress release ring is fully or partially received in the receiving space, and there is a gap between the outer peripheral surface of the stress release ring and the circumferential groove wall of the first arc groove.

2. The sealing device according to claim 1, characterized in that: The longitudinal section of the stress release ring is in the shape of a curved thin sheet.

3. The sealing device according to claim 2, characterized in that: The longitudinal section of the stress release ring is C-shaped arched radially outward, or C-shaped arched radially inward, or W-shaped with an opening facing radially inward or radially outward, or corrugated.

4. The sealing device according to claim 1, characterized in that: The longitudinal section of the stress release ring is C-shaped and arches outward in the radial direction, and the outer peripheral surface of the stress release ring is in contact with the circumferential groove wall of the second arc-shaped groove.

5. The sealing device according to claim 1, characterized in that: One of the inner shaft end of the first ring and the inner shaft end of the second ring is provided with an annular boss, and the other is provided with an annular groove. The radial thickness of the annular boss is smaller than the radial width of the annular groove, and the annular boss is correspondingly inserted into the annular groove.

6. The sealing device according to claim 5, characterized in that: The annular boss is arranged on the first ring, the annular groove is arranged on the second ring, and a gap is provided between the inner peripheral surface of the annular boss and the inner peripheral wall of the annular groove; Alternatively, the annular groove is arranged on the first ring, the annular boss is arranged on the second ring, and a gap is provided between the outer peripheral surface of the annular boss and the outer peripheral wall of the annular groove.

7. The sealing device according to claim 5, characterized in that: An inner sealing ring is also arranged on the annular boss, and the inner sealing ring is sealedly connected to the bottom surface of the annular groove.

8. The sealing device according to any one of claims 1 to 7, characterized in that: The sealing gasket also includes a leak detection ring, and the axial ends on both sides of the leak detection ring are welded and fixed to the outer peripheral portion of the first ring and the outer peripheral portion of the second ring along the circumferential direction respectively. A closed leak detection chamber is formed between the first ring, the second ring, the stress release ring and the leak detection ring, and the leak detection ring is also connected to a leak detection tube connected to the leak detection chamber.

9. The sealing device according to claim 8, characterized in that: A first outer sealing ring is also provided at the outer axial end of the first ring, the first outer sealing ring is located radially outside the first sealing ring, and a first leak detection hole is opened on the first ring and penetrates along the axial direction, and the first leak detection hole is located radially between the first sealing ring and the first outer sealing ring; A second outer sealing ring is provided at the outer axial end of the second ring. The second outer sealing ring is located radially outside the second sealing ring. A second leak detection hole is opened on the second ring and penetrates axially. The second leak detection hole is radially located between the second sealing ring and the second outer sealing ring.

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