A reusable high-reliability pressure test gasket ring

Abstract

The utility model discloses a kind of reusable high-reliability pressure test sealing gasket ring, which is composed of metal clamp and rubber ring;The metal clamp is an annular body, the upper outer wall of which is a first outer slope surface with gradually increasing outer diameter from top to bottom, and the lower outer wall of which is a second outer slope surface with gradually decreasing outer diameter from top to bottom, so that the upper outer wall and the lower outer wall of the metal clamp respectively fit with the outer side groove walls of the two annular sealing grooves and form face seals;The rubber ring is a cylindrical body, which is sleeved in the metal clamp, and the end faces of both ends extend to the outer side of the end faces of the metal clamp;The upper inner wall of the rubber ring is a first inner slope surface with gradually increasing inner diameter from top to bottom, and the lower inner wall of which is a second inner slope surface with gradually decreasing inner diameter from top to bottom;The sealing gasket ring adopts a split structure design, replaces part of the metal gasket ring with the rubber ring, and reduces the weight;At the same time, through structural improvement, compared with the traditional sealing gasket ring, plastic deformation is avoided, wear resistance is achieved, service life is long, and cost is low.

Description

Technical Field

[0001] This utility model relates to the field of blowout preventer control technology, and in particular to a reusable, highly reliable pressure testing sealing ring. Background Technology

[0002] Flanges are a critical component connecting well control systems. Ensuring a secure seal between flanges, especially under high-pressure conditions, is crucial for well control effectiveness, and the quality of the seal between flanges depends on the sealing gaskets.

[0003] Under high-pressure conditions, traditional sealing rings generally use, for example... Figure 1 The metal gasket shown is installed in a trapezoidal annular groove between two connecting flanges. The metal gasket has an annular structure, and to form a hard seal with the side walls of the trapezoidal annular groove, its top and bottom outer and inner edges are respectively machined with slopes adapted to the groove walls. Multiple vertically penetrating vent holes are evenly distributed along the circumference of the gasket. However, as... Figure 3 As shown, when the connecting bolts between the two flanges are tightened, the traditional sealing gasket ring is subjected to the axial compressive force of the two flanges and fits tightly against the trapezoidal annular grooves on the upper and lower sides. Through plastic deformation, an annular sealing band is formed to establish the initial seal. Subsequently, under the action of medium pressure, the sealing gasket ring expands radially under pressure, fitting even tighter against the groove walls of the trapezoidal annular grooves and generating a self-tightening effect. This self-tightening effect allows the metal ring gasket to maintain good sealing performance under conditions of large pressure fluctuations, but it also brings irreversible damage, resulting in most metal ring gaskets being usable only once. They are not suitable for flanges that require repeated disassembly and pressure testing.

[0004] Therefore, in order to extend the service life of the sealing gasket ring for test pressure, it is necessary to design a sealing gasket ring with a new structure, so as to ensure effective sealing between flanges while having better pressure resistance and avoiding irreversible plastic damage and deformation due to excessive pressure. Utility Model Content

[0005] The purpose of this invention is to provide a reusable, highly reliable pressure-testing sealing ring that solves the above-mentioned technical problems.

[0006] Therefore, the technical solution of this utility model is as follows:

[0007] A reusable, high-reliability pressure-testing sealing ring consists of a metal clamp and a rubber ring; wherein,

[0008] The metal clamp is an annular body. Its upper outer wall is a first outer slope with an outer diameter that gradually increases from top to bottom, and its lower outer wall is a second outer slope with an outer diameter that gradually decreases from top to bottom. The first and second outer slopes are adapted to the groove wall slopes of the annular sealing grooves on the two flanges that are connected to each other, so that the upper and lower outer walls of the metal clamp fit against the outer groove walls of the two annular sealing grooves and form a surface seal.

[0009] The rubber ring is a cylindrical tube, which is fitted inside the metal clamp in such a way that its outer wall fits against the inner wall of the metal clamp, and the two end faces of the rubber ring extend to the outer sides of the two end faces of the metal clamp respectively; the upper inner wall of the rubber ring is a first inner slope surface with an inner diameter that gradually increases from top to bottom, and the lower inner wall is a second inner slope surface with an inner diameter that gradually decreases from top to bottom.

[0010] Furthermore, the axial length of the metal clamp is less than or equal to the total groove depth of the annular sealing grooves on the two flanges, and the outer diameter of the metal clamp is 0.2mm to 0.5mm larger than the groove opening diameter of the outer groove wall of the annular sealing groove.

[0011] Furthermore, the axial length of the rubber ring is 2.5mm to 3mm greater than the total groove depth of the annular sealing grooves of the two flanges.

[0012] Furthermore, the difference between the maximum and minimum inner diameter of the rubber ring is 4.5mm to 5mm.

[0013] Furthermore, the metal clamps are carbon steel clamps.

[0014] Furthermore, the rubber ring is a nitrile rubber ring.

[0015] Compared with existing technologies, this reusable high-reliability pressure testing gasket ring adopts a split structure design consisting of an outer metal clamp and an inner rubber ring. This design reduces the overall weight of the gasket ring by replacing part of the metal gasket structure with the inner rubber ring. At the same time, by designing the outer metal clamp as a beveled surface that can fit against the outer wall of the flange's annular sealing groove, the metal clamp is prevented from plastic deformation due to excessive pressure, improving wear resistance and extending service life. In addition, this split structure design allows for separate repair and maintenance, further reducing costs. Actual usage tests have shown that this reusable high-reliability pressure testing gasket ring is lighter and less prone to plastic deformation than traditional gasket rings, and can be repeatedly used in pressure testing and high-pressure operating conditions, demonstrating good market application and promotion prospects. Attached Figure Description

[0016] Figure 1 This is a side sectional view of a traditional metal sealing gasket ring;

[0017] Figure 2This is a side sectional view of the reusable, high-reliability pressure-testing sealing ring of this utility model.

[0018] Figure 3 A partial cross-sectional view showing a traditional metal gasket ring positioned within an annular sealing groove between two connecting flanges;

[0019] Figure 4 This is a partial cross-sectional view of the reusable, high-reliability pressure-testing sealing gasket ring of this invention, which is installed in the annular sealing groove of two connecting flanges. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention.

[0021] See Figure 2 The reusable, high-reliability pressure-testing sealing ring consists of a metal clamp 1 and a rubber ring 2; the metal clamp 1 is made of 10# carbon steel, and the rubber ring 2 is made of nitrile rubber.

[0022] See Figure 3 and Figure 4 The reusable, high-reliability pressure-testing sealing gasket ring is used to be embedded in the annular sealing groove 4 on two mating flanges 3. The annular sealing groove 4 on the flange 3 is a trapezoidal annular groove with a groove width that gradually decreases from the groove opening to the groove bottom. The trapezoidal annular groove has two annular groove walls. The annular groove wall near the center of the flange 3 is the inner groove wall, and correspondingly, the annular groove wall near the outer side of the flange 3 is the outer groove wall. In addition, the groove opening of the annular sealing groove 4 is chamfered.

[0023] Based on the structural characteristics of the annular sealing groove 4 on the flange 3, the metal clamp 1 is an annular body. Its upper outer wall is machined into a first outer slope with an outer diameter that gradually increases from top to bottom, and its lower outer wall is machined into a second outer slope with an outer diameter that gradually decreases from top to bottom. Since the two flanges 3 that are connected are two identical flanges, the slope of the first outer slope is the same as the slope of the second outer slope, and the slope of the groove wall of the annular sealing groove 4 is the same. This allows the first and second outer slopes of the metal clamp 1 to completely fit against the outer groove walls of the annular sealing groove 4 on the two flanges 3, forming a surface seal.

[0024] In terms of size design, the axial length of the metal clamp 1 in this embodiment is equal to the total groove depth of the annular sealing groove 4 on the two flanges 3. Based on the diameter of the groove opening of the annular sealing groove 4 on the outer side of the flange 3 being 176.75mm, the outer diameter of the metal clamp 1 is designed to be 177mm. This 0.25mm difference allows the two flanges 3 to be connected by bolts, and the two flanges 3 can be separated by the external support of the metal clamp 1, leaving a 1mm gap between the two flanges 3. Since the groove opening of the annular sealing groove 4 of the flange 3 itself is chamfered, the tip formed by the junction of the first outer slope and the second outer slope on the metal clamp 1 is just embedded in the space formed between the chamfers at the groove openings of the two annular sealing grooves 4.

[0025] The advantages of the above structural design are as follows: Firstly, by utilizing the external support of the metal clamp 1, a gap is left between the two flanges 3, which ensures that there is a gap between the two end faces of the metal clamp 1 and the bottom of the annular sealing groove 4 of the flange 3, thus avoiding excessive deformation of the metal clamp 1 due to compression and causing irreversible damage. Secondly, the metal clamp 1 and the annular sealing groove 4 of the flange 3 form a surface seal by fitting together with the inclined surface, which also has the advantage of effectively avoiding excessive deformation.

[0026] The rubber ring 2 is a cylindrical structure, and its outer wall is fitted onto the annular inner wall of the metal clamp 1 in a way that fits against the inner wall of the metal clamp 1. The upper inner wall of the rubber ring 2 is processed into a first inner slope surface with an inner diameter that gradually increases from top to bottom, and its lower inner wall is processed into a second inner slope surface with an inner diameter that gradually decreases from top to bottom.

[0027] In terms of size design, the axial length of the rubber ring 2 in this embodiment is greater than the total groove depth of the annular sealing groove 4 of the two flanges 3 by 2.5mm. This allows the rubber ring 2 to completely fill the bottom of the annular sealing groove 4 under the simultaneous compression of the bottom of the annular sealing groove 4 on both the upper and lower sides, thereby ensuring that the upper and lower ends of the rubber ring 2 form a tight seal with the bottom of the annular sealing groove 4. The difference between the maximum inner diameter and the minimum inner diameter of the rubber ring 2 is 4.5mm. This inner wall structure design can achieve better axial compression while achieving sealing performance, and compared with traditional sealing gaskets, it does not require special opening of air holes.

[0028] See Figure 4 The specific sealing working principle of this reusable, high-reliability pressure-testing sealing ring is described below.

[0029] In use, the lower part of the reusable high-reliability test pressure sealing gasket is embedded in the annular sealing groove 4 of the lower flange 3, and then the upper flange 3 is connected to it, so that the upper part of the reusable high-reliability test pressure sealing gasket is embedded in the annular sealing groove 4 of the upper flange 3, and the connecting bolts between the two flanges 3 are tightened.

[0030] In this state, the outer wall of the metal clamp 1 of the reusable, high-reliability pressure-testing sealing ring mates with the outer walls of the upper and lower annular sealing grooves 4, forming a hard seal. Unlike traditional sealing rings, the surface seal formed by the mating inclined surfaces does not undergo excessive plastic deformation. The inner rubber ring 2, due to its V-shaped structure formed by the first and second inner slopes, deforms after assembly. This deformation mainly occurs at both ends of the rubber ring 2, generating pressure at the contact points. Even without applying clamping force, the lip can seal a certain amount of internal pressure. When the working pressure of the medium increases, the two ends of the rubber ring 2 are further compressed, changing the contact shape to increase contact stress, thus making it fit more tightly against the sealed surface and achieving a seal. This self-sealing effect not only ensures a good sealing effect of the rubber ring 2 under high-pressure environments but also allows for reversible deformation after pressure is released.

[0031] To further verify the structural improvement effect of the high-reliability test pressure sealing ring of this application compared with the traditional sealing ring, pressure tests were conducted on the reusable high-reliability test pressure sealing ring of this embodiment and the traditional sealing ring.

[0032] The specific method for pressure testing is as follows: using clean water as the medium, reusable high-reliability test gaskets and traditional gaskets are respectively placed in the annular sealing grooves of the two connecting flanges on the pressure testing device, and pressure tests are conducted separately. The pressure testing process is as follows: the water pressure is increased to the rated working pressure of 69.0~72.45MPa, and the water pressure is stabilized and greater than or equal to the rated working pressure for a stabilization time of greater than or equal to 10 minutes; then, the water pressure is reduced to zero. After confirming that the water pressure is zero, the connection points of the two flanges are observed for leakage, and the pressure change values ​​obtained by the pressure transmitter connected to the pressure pump during the pressure test are recorded in real time. The specific test results are shown in Table 1.

[0033] Table 1:

[0034] Test object Is there any leakage? pressure drop Deformation Product in this embodiment No visible leakage was observed. 0.4MPa <0.5mm, elastic deformation Traditional sealing gasket ring No visible leakage was observed. 0.7MPa ≈3mm, plastic deformation

[0035] As can be seen from the test results in Table 1, the reusable high-reliability pressure-testing sealing gasket ring of this embodiment, like the traditional sealing gasket ring, showed no visible leakage after the pressure drop test, indicating good sealing performance. Furthermore, the reusable high-reliability pressure-testing sealing gasket ring of this embodiment exhibited a smaller pressure drop than the traditional sealing gasket ring, with a reduction of approximately 42%, demonstrating better pressure stabilization performance. Moreover, after the pressure drop test, the deformation of the contact surface between the reusable high-reliability pressure-testing sealing gasket ring of this embodiment and the annular sealing groove 4 on the flange 3 was <0.5mm, which is elastic deformation and does not affect subsequent use, resulting in a longer service life. In contrast, the deformation of the contact surface between the traditional sealing gasket ring and the annular sealing groove 4 on the flange 3 was approximately 3mm, which is plastic deformation and does not meet the requirements for secondary use.

[0036] In summary, this reusable, high-reliability pressure testing sealing ring has excellent sealing performance and wear resistance, and can be widely used in pressure testing operations under high-pressure conditions, as well as in high-pressure well control operations.

Claims

1. A reusable, high-reliability pressure-testing sealing ring, characterized in that, It consists of a metal clamp (1) and a rubber ring (2); wherein, The metal clamp (1) is an annular body. Its upper outer wall is a first outer slope surface with an outer diameter that gradually increases from top to bottom, and its lower outer wall is a second outer slope surface with an outer diameter that gradually decreases from top to bottom. The first and second outer slope surfaces are respectively adapted to the groove wall slope of the annular sealing groove (4) on the two flanges (3) that are connected to each other, so that the upper and lower outer walls of the metal clamp (1) are respectively in contact with the outer groove walls of the two annular sealing grooves (4) and form a surface seal. The rubber ring (2) is a cylindrical body. Its outer wall is fitted inside the metal clamp (1) in a way that fits against the inner wall of the metal clamp (1). The two end faces of the rubber ring (2) extend to the outer side of the two end faces of the metal clamp (1). The upper inner wall of the rubber ring (2) is a first inner slope surface with an inner diameter that gradually increases from top to bottom, and the lower inner wall is a second inner slope surface with an inner diameter that gradually decreases from top to bottom.

2. The reusable, high-reliability pressure-testing sealing ring according to claim 1, characterized in that, The axial length of the metal clamp (1) is less than or equal to the total groove depth of the annular sealing groove (4) on the two flanges (3), and the outer diameter of the metal clamp (1) is 0.2 mm to 0.5 mm larger than the groove opening diameter of the outer groove wall of the annular sealing groove (4).

3. The reusable, high-reliability pressure-testing sealing ring according to claim 1, characterized in that, The axial length of the rubber ring (2) is 2.5mm to 3mm greater than the total groove depth of the annular sealing groove (4) of the two flanges (3).

4. The reusable, high-reliability pressure-testing sealing ring according to claim 1, characterized in that, The difference between the maximum and minimum inner diameter of the rubber ring (2) is 4.5 mm to 5 mm.

5. The reusable, high-reliability pressure-testing sealing ring according to claim 1, characterized in that, The metal clamp (1) is a carbon steel clamp.

6. The reusable, high-reliability pressure-testing sealing ring according to claim 1, characterized in that, The rubber ring (2) is a nitrile rubber ring.

Images