Sealing structure

Abstract

The utility model belongs to the field of ultrahigh pressure equipment sealing, and particularly discloses a sealing structure which comprises a first sealed part, a sealing ring and a second sealed part, a step is arranged at the front end of the first sealed part, the sealing ring is sleeved on the step at the front end of the first sealed part, and the second sealed part is sleeved on the sealing ring. The sealing ring and the front end of the first sealed part are both installed in the second sealed part, the front conical surface of the sealing ring abuts against the step of the second sealed part, and the rear conical surface of the sealing ring abuts against the first sealed part. According to the utility model, the sealing ring is deformed under the action of pretightening force and high pressure, so that the sealing effect is improved; and a gap exists between the sealing ring and the valve body, so that the inside and outside of the valve body are subjected to high pressure, the fatigue damage accumulation rate is reduced, and the valve body is protected.

Description

Technical Field

[0001] This utility model belongs to the field of ultra-high pressure equipment sealing, and in particular relates to a sealing structure. Background Technology

[0002] To meet the sealing requirements of ultra-high pressure equipment, especially those with pressures exceeding 100 MPa, existing sealing structures between the valve body and the cylinder mainly fall into two categories. One is a sealing assembly, such as the one with patent number CN219366794U, which uses a conical valve body with a combined sealing assembly to achieve the seal between the valve body and the cylinder. The second type uses... Figure 3 The sealing structure shown has a stepped valve body, and the combined seal is transformed into a single metal ring + elastic ring + retaining ring.

[0003] Both of the above sealing structures are susceptible to high-pressure impacts and friction during use, which can cause the seals to wear and age, resulting in a short lifespan and requiring frequent replacement of the sealing rings.

[0004] As for the valve body, the high-pressure passage inside the valve body is subjected to high pressure, causing it to deform and expand. Meanwhile, the outer peripheral surface of the valve body is in close contact with the sealing structure. The friction between the deformed valve body and the sealing element easily leads to wear of the valve body. Moreover, the valve body suffers fatigue failure under repeated high-pressure impacts, resulting in a short valve body life and rapid consumption. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a sealing structure. This utility model uses pre-tightening force and high pressure to deform the sealing ring, thereby improving the sealing effect. Furthermore, there is a gap between the sealing ring and the valve body, which subjects both the inside and outside of the valve body to high pressure, slowing down the rate of fatigue damage accumulation and protecting the valve body.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a sealing structure, including a first sealed element, a sealing ring and a second sealed element, wherein a step is provided at the front end of the first sealed element, the sealing ring is fitted at the step at the front end of the first sealed element, the sealing ring and the front end of the first sealed element are both installed inside the second sealed element, the front conical surface of the sealing ring abuts against the step of the second sealed element, and the rear conical surface of the sealing ring abuts against the first sealed element.

[0007] Furthermore, the sealing ring and the first sealed component are in a clearance fit.

[0008] Furthermore, the step where the second sealed element contacts the sealing ring is rounded.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: The sealing ring of this utility model has conical surfaces at both ends, which deform and self-tighten under high pressure and pre-tightening force, thus improving the sealing effect. Furthermore, the sealing ring and the first sealed component are installed with a gap, allowing the high-pressure medium to act on the outer circumferential surface of the first sealed component through the gap between the first sealed component and the sealing ring. The force on the outer circumferential surface of the first sealed component is balanced with the force on the high-pressure channel inside the valve body. Under this state, the stress concentration factor is reduced, the alternating stress amplitude at micro-defects is decreased, the fatigue damage accumulation rate is slowed down, and thus the initiation of fatigue cracks is delayed. Attached Figure Description

[0010] The present invention will be further described below with reference to the accompanying drawings.

[0011] Figure 1 This is a schematic diagram of the sealing structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the sealing ring.

[0013] Figure 3 This refers to the existing structural style of combined seals.

[0014] In the figure, 1 is the first sealed component, 2 is the sealing ring, 21 is the annular body, 22 is the front conical surface, 23 is the rear conical surface, 3 is the second sealed component, and 4 is the rounded corner. Detailed Implementation

[0015] like Figure 2 As shown, a sealing ring includes an annular body 21, with conical surfaces at both its front and rear ends. The material of the annular body 21 needs to withstand high pressure; it is made of beryllium bronze or stainless steel. The front conical surface 22 and the rear conical surface 23 of the annular body 21 respectively abut against two sealed components to form sealing surfaces. Furthermore, the two conical surfaces deform differently for different sealed components, allowing it to adapt to different working environments.

[0016] The structure of sealing ring 2 has been briefly described above. Based on the above structure, the sealing structure using sealing ring 2 will be described in detail below.

[0017] like Figure 1 As shown, a sealing structure includes a first sealed element 1, a sealing ring 2, and a second sealed element 3. The front end of the first sealed element 1 is provided with a step 5. The sealing ring 2 is fitted onto the step 5 at the front end of the first sealed element 1. The sealing ring 2 and the front end of the first sealed element 1 are both installed inside the second sealed element 3. The front conical surface 22 of the sealing ring 2 abuts against the step 5 of the second sealed element 3, and the rear conical surface 23 of the sealing ring 2 abuts against the first sealed element 1.

[0018] The gap S between the sealing ring 2 and the first sealed component 1 is greater than 0, which allows the ultra-high pressure medium to enter between them, and the pressure inside and outside the first sealed component 1 is balanced.

[0019] The step 5 where the second sealed element 3 contacts the sealing ring 2 is rounded 4, so that when the sealing ring 2 moves forward under the preload, it will move along the rounded corner and will not be scratched, thus affecting the strength of the sealing ring 2.

[0020] Specifically, in this embodiment, the first sealing element is a valve body, and the second sealing element is a high-pressure cylinder. The right end of the valve body is inserted into the high-pressure cylinder, and the sealing assembly is sleeved on the right end of the valve body, located between the outer circumferential surface of the valve body and the inner circumferential surface of the high-pressure cylinder. Taking the valve body and the high-pressure cylinder as examples, the sealing principle of the sealing structure of this utility model is introduced.

[0021] The seal between sealing ring 2 and the high-pressure cylinder relies on the front conical surface 22 of sealing ring 2. The contact portion between the cylinder step 5 and sealing ring 2 forms a coil. Even if there is relative movement between the cylinder and sealing ring 2, the contact portion will always remain a coil on the conical surface, ensuring a consistent seal. The high-pressure medium fills the gap between sealing ring 2 and the valve body. Under high pressure, sealing ring 2 deforms, expanding radially and reducing the gap between it and the cylinder. This brings sealing ring 2 closer to the inner wall of the cylinder, resulting in a better seal. The seal between sealing ring 2 and the valve body is achieved during installation by using pre-tightening force to press sealing ring 2 onto the valve body. Under the pre-tightening force, the rear conical surface 23 of sealing ring 2 forms a planar seal with the valve body. In the axial direction, under the pre-tightening force, even if there is relative movement between the front conical surface 22 of sealing ring 2 and the cylinder, the rear conical surface 23 of sealing ring 2 and the valve body remain in contact and sealed.

[0022] The sealing ring 2 is coaxially mounted with the front end of the valve body, and there is a circumferential gap between the sealing ring 2 and the front end of the valve body, resulting in a non-fitting connection. High-pressure medium impacts the valve body from the high-pressure cylinder end, filling the high-pressure channel of the valve body and simultaneously filling the gap between the sealing ring 2 and the front end of the valve body. This allows the internal and external surfaces of the valve body to withstand ultra-high pressure simultaneously, thereby significantly delaying the initiation of fatigue cracks in the valve body and protecting it.

[0023] The sealing structure of this invention can be applied to ultra-high pressure boosters and other ultra-high pressure containers, thereby improving sealing performance and extending the service life of the equipment.

[0024] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A sealing structure, characterized in that: It includes a first sealed element (1), a sealing ring (2) and a second sealed element (3). The front end of the first sealed element (1) is provided with a step. The sealing ring (2) is fitted on the step at the front end of the first sealed element (1). The front ends of the sealing ring (2) and the first sealed element (1) are both installed inside the second sealed element (3). The front conical surface (22) of the sealing ring (2) abuts against the step of the second sealed element (3), and the rear conical surface (23) of the sealing ring (2) abuts against the first sealed element (1).

2. The sealing structure according to claim 1, characterized in that: The sealing ring (2) and the first sealed component (1) are in clearance fit.

3. The sealing structure according to claim 2, characterized in that: The step where the second sealed element (3) contacts the sealing ring (2) is rounded (4).

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