Spring energy storage sealing ring and sealing structure

Abstract

The utility model relates to a spring energy storage sealing ring which comprises a sealing clamping sleeve, and a groove is formed in the outer side of the root of the sealing clamping sleeve in the circumferential direction. An O-shaped ring is arranged in the groove; and one part of the O-shaped ring is arranged on the outer side of the groove. By means of the O-shaped ring, a static sealing effect and a pressure maintaining effect can be achieved in the reciprocating motion of the piston rod; when the piston rod rotates, the sealing jacket can be prevented from rotating together with the piston rod in the working process, and abrasion of the auxiliary lip of the sealing jacket is prevented from being increased. And the piston rod can play a role in fixing the sliding ring in the swinging motion process, and can provide pre-compression force for the sealing jacket, so that the sealing effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of spring energy storage sealing rings, and particularly relates to a spring energy storage sealing ring and a sealing structure. Background Art

[0002] The spring energy sealing ring is a relatively excellent elastic sealing component. The elastic force given by the spring plus the pressure of the system fluid pushes the sealing lip out, and the sealing lip presses the sealed metal surface to form the required intentional sealing effect. It is currently widely used in places with extremely high requirements for durability, chemical resistance and working under extreme temperatures.

[0003] Generally, a spring energy storage seal ring is composed of a sealing jacket and an energy storage spring. The cross section of the jacket is U-shaped and has a forked sealing lip. The spring is located in the U-shaped opening of the sealing jacket. When the spring energy storage seal ring is installed in the sealing groove, the spring is compressed to form an outward tension, which causes the sealing lip of the sealing jacket to be close to the sealing groove. Since the spring permanently provides elastic force to the sealing lip of the jacket, a seal is formed. The sealing jacket is usually made of PTFE material because PTFE has an extremely low friction coefficient and can ensure the stability of its mechanical properties within a wide temperature range; the rebound of the energy storage spring can enable the seal ring to maintain good sealing performance under low pressure. At the same time, when the jacket material is slightly worn, it can still seal the fluid medium through rebound. Therefore, spring energy storage seal rings are widely used in various fields of industry.

[0004] However, when the spring energy storage seal is used on equipment with frequent reciprocating or rotating cylinder movements, after the piston rod has been reciprocating for a long time, the force applied to the sealing jacket is greater than the rebound force of the energy storage spring, and a gap is created between the sealing lip and the sealing groove, resulting in insufficient sealing pressure retention performance. Since the PTFE material has excellent self-lubricating properties, after the piston rod has been rotating for a long time, the spring energy storage seal will rotate according to the piston rod, causing accelerated wear of the sealing surface. Utility Model Content

[0005] The utility model aims to provide a spring energy storage seal ring and a seal structure, which can play a static sealing role in reciprocating motion and prevent the sealing jacket and the piston rod from rotating together in the rotary seal.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is a spring energy storage seal ring, including a sealing jacket,

[0007] A groove is circumferentially provided on the outer side of the root of the sealing jacket; an O-ring is arranged in the groove.

[0008] Preferably, a portion of the O-ring is outside the groove.

[0009] Preferably, a spring is provided in the U-shaped groove of the sealing jacket; the spring is any one of a V-shaped spring, a C-shaped spring, an H-shaped spring or an F-shaped spring.

[0010] A sealing structure comprises a cylinder body, a piston rod and the spring energy storage sealing ring mentioned above,

[0011] A groove is circumferentially formed on one side of the cylinder body close to the piston rod; the spring energy storage sealing ring is installed in the groove; and the O-ring is tightly attached to the bottom of the groove.

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] The utility model can play a static sealing role and maintain pressure through the O-ring when the piston rod makes a reciprocating motion; can prevent the sealing jacket from rotating together with the piston rod during work and increase the wear of the auxiliary lip of the sealing jacket through the O-ring when the piston rod makes a rotating motion; can play a role of a fixed slip ring when the piston rod makes a swinging motion, and can provide a pre-compression force for the sealing jacket, thereby improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the sealing structure installation section

[0015] Figure 2 It is a schematic diagram of the sealing structure;

[0016] Figure 3 It is a schematic diagram of the structure of a spring energy storage seal ring;

[0017] Figure 4 This is a schematic diagram of the structure of a spring energy storage seal ring in another embodiment. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] like Figure 1-4 As shown, a sealing structure includes a cylinder body 6 and a piston rod 7.

[0020] The piston rod 7 is arranged in the cylinder body 6, and the piston rod 7 can perform reciprocating motion, rotational motion or swinging motion; a groove 8 is circumferentially provided on one side of the cylinder body 6 close to the piston rod 7; a spring energy storage sealing ring is installed in the groove 8, and the spring energy storage sealing ring is sleeved on the piston rod 7, and the cylinder body 6 and the piston rod 7 are sealed by the spring energy storage sealing ring;

[0021] The spring energy storage sealing ring includes a sealing jacket 1, a spring 5 is arranged in a U-shaped groove 4 of the sealing jacket 1, which can provide initial sealing for the sealing jacket 1; a groove 3 is opened circumferentially on the outer side of the root of the sealing jacket 1; an O-ring 2 is arranged in the groove 3, wherein a part of the O-ring 2 is outside the groove 3; the O-ring 2 is tightly attached to the bottom of the groove 8, and when a gap is generated between the sealing lip of the sealing jacket 1 and the groove 8 during the reciprocating motion of the piston rod 7, the O-ring 2 is still tightly attached to the bottom of the groove 8, which can play a static sealing role and a pressure-maintaining effect; when the piston rod 7 makes a rotational motion, the O-ring 2 is tightly attached to the groove 8, so that the friction force at the root of the sealing jacket 1 is increased, preventing the sealing jacket 1 from rotating together with the piston rod 7 during work, and increasing the wear of the secondary lip of the sealing jacket 1; when the piston rod 7 makes a swinging motion, it plays the role of a fixed slip ring, and can provide a pre-compression force for the sealing jacket 1, thereby improving the sealing effect.

[0022] In different embodiments, the spring 5 is any one of a V-type spring, a C-type spring, an H-type spring or an F-type spring; the material of the spring 5 is any one of 301 / 302 / 306 stainless steel, Hastelloy C-276 (Hastelloy alloy), Elgiloy (cobalt-based alloy), and Inconel 718 (nickel-based alloy).

[0023] In this embodiment, the sealing jacket 1 is made of fluoropolymer resin PTFE.

[0024] When the utility model is used, the spring 5 energy storage seal ring is installed in the groove 8, and then the piston rod 7 is installed in the cylinder body 6, so that the piston rod 7 and the spring 5 energy storage seal ring are closely fitted. Since the spring 5 expands outward after being squeezed, it begins to press the sealing jacket 1 to form an initial seal. Since PTFE has good self-lubrication, when the piston rod 7 rotates for a long time, the sealing jacket 1 will rotate with it, causing the sealing auxiliary lip to wear faster. By placing the O-ring 2 in the groove 3 at the root of the sealing jacket 1, the O-ring 2 is compressed by contacting the groove 8, so that the friction force at the root of the spring 5 energy storage seal ring is increased to achieve the effect of preventing movement; after the piston rod 7 reciprocates for a long time, a gap is generated between the sealing lip of the sealing jacket 1 and the sealing groove 8, and the O-ring 2 is still tightly attached to the bottom of the groove 8, which can play a static sealing role and a pressure-maintaining effect.

Claims

1. A sealing structure, characterized in that: It includes a cylinder body (6), a piston rod (7) and a spring energy storage seal ring. A groove (8) is circumferentially formed on one side of the cylinder body (6) close to the piston rod (7); the spring energy storage seal ring is installed in the groove (8); The spring energy storage seal ring comprises a sealing jacket (1), a groove (3) is circumferentially formed on the outer side of the root of the sealing jacket (1); an O-ring (2) is arranged in the groove (3); a part of the O-ring (2) is outside the groove (3); and the O-ring (2) is in close contact with the bottom of the groove (8).

2. The sealing structure according to claim 1, characterized in that: A spring (5) is arranged in the U-shaped groove (4) of the sealing jacket (1); the spring (5) is any one of a V-shaped spring, a C-shaped spring, an H-shaped spring or an F-shaped spring.

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