CN-224214685-U - Sealing structure

CN224214685UCN 224214685 UCN224214685 UCN 224214685UCN-224214685-U

Abstract

The utility model belongs to the field of ultrahigh pressure equipment sealing, and particularly discloses a sealing structure which adopts the following technical scheme: the sealing ring is sleeved at the step of the front end of the first sealed piece, the front ends of the sealing ring and the first sealed piece are both arranged in the second sealed piece, the front conical surface of the sealing ring is abutted to the step of the second sealed piece, and the rear conical surface of the sealing ring is abutted to the first sealed piece. The utility model deforms the sealing ring under the action of pretightening force and high pressure, improves the sealing effect, and has a gap between the sealing ring and the valve body, so that the inside and the outside of the valve body are subjected to the high pressure, the fatigue damage accumulation rate is slowed down, and the valve body is protected.

Inventors

DU JINGDONG
ZHANG JIANG
ZHAO YUE

Assignees

山西力德福科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250509

Claims (3)

1. The sealing structure is characterized by comprising a first sealed piece (1), a sealing ring (2) and a second sealed piece (3), wherein a step is arranged at the front end of the first sealed piece (1), the sealing ring (2) is sleeved at the step of the front end of the first sealed piece (1), the sealing ring (2) and the front end of the first sealed piece (1) are both arranged in the second sealed piece (3), the front conical surface (22) of the sealing ring (2) is abutted to the step of the second sealed piece (3), and the rear conical surface (23) of the sealing ring (2) is abutted to the first sealed piece (1).
2. A sealing structure according to claim 1, wherein the sealing ring (2) is in clearance fit with the first sealed member (1).
3. A sealing structure according to claim 2, wherein the step of the second sealed member (3) contacting the seal ring (2) is rounded (4).

Description

Sealing structure Technical Field The utility model belongs to the field of ultrahigh pressure equipment sealing, and particularly relates to a sealing structure. Background In order to meet the sealing requirement of the ultrahigh pressure equipment, particularly for the ultrahigh pressure equipment with the pressure of more than 100MPa, the sealing structure between the existing valve body and the cylinder body mainly has two forms, one is a sealing component with the patent number of CN219366794U, and the sealing component adopts a combined sealing component on the valve body with a conical structure to finish the sealing between the valve body and the cylinder body. The second is to adopt the sealing structure shown in fig. 3, the valve body is provided with steps, and the combined seal is changed into a form of a single metal ring, an elastic ring and a check ring. For the two sealing structures, the sealing structure is easily affected by high-pressure impact, friction and other factors in the use process, and the sealing structure is easy to wear and age, so that the service life of the sealing structure is short, and the sealing ring needs to be replaced frequently. And for the valve body, a high-pressure channel in the valve body is subjected to high pressure action, deformation and expansion are carried out, the outer peripheral surface of the valve body is in close contact with the sealing structure, and friction is generated between the deformed valve body and the sealing piece, so that the valve body is easy to wear. And the valve body generates fatigue damage under repeated high-pressure impact, so that the service life of the valve body is short and the consumption is quick. Disclosure of utility model In order to solve the problems in the prior art, the utility model provides the sealing structure, the sealing ring is deformed under the action of pretightening force and high pressure, the sealing effect is improved, and a gap exists between the sealing ring and the valve body, so that the inside and the outside of the valve body are subjected to the high pressure, the fatigue damage accumulation rate is slowed down, and the valve body is protected. In order to solve the technical problems, the sealing structure comprises a first sealed piece, a sealing ring and a second sealed piece, wherein the front end of the first sealed piece is provided with a step, the sealing ring is sleeved at the step of the front end of the first sealed piece, the sealing ring and the front end of the first sealed piece are both arranged in the second sealed piece, the front conical surface of the sealing ring is propped against the step of the second sealed piece, and the rear conical surface of the sealing ring is propped against the first sealed piece. Further, the sealing ring is in clearance fit with the first sealed piece. Further, the step where the second sealed piece is contacted with the sealing ring is rounded. Compared with the prior art, the sealing ring has the beneficial effects that the conical surfaces are arranged at the two ends of the sealing ring, and the sealing ring deforms and self-expands under the action of high pressure and pretightening force, so that the sealing effect is improved. And the gap between the sealing ring and the first sealed piece is arranged, and the high-pressure medium acts on the outer peripheral surface of the first sealed piece through the gap between the first sealed piece and the sealing ring. The stress on the outer peripheral surface of the first sealed piece is balanced with the stress on the high-pressure channel inside the valve body, in this state, the stress concentration coefficient is reduced, the alternating stress amplitude at the microscopic defect is reduced, and the fatigue damage accumulation rate is slowed down, so that the fatigue crack initiation ‌ ‌ is delayed. Drawings The utility model is further described below with reference to the accompanying drawings. Fig. 1 is a schematic view of a seal structure of the present utility model. Fig. 2 is a schematic structural view of the seal ring. Fig. 3 is a structural style of a prior art composite seal. In the figure, 1 is a first sealed piece, 2 is a sealing ring, 21 is an annular body, 22 is a front conical surface, 23 is a rear conical surface, 3 is a second sealed piece, and 4 is a rounding angle. Detailed Description As shown in fig. 2, a seal ring includes an annular body 21, and both front and rear ends of the annular body 21 are provided with tapered surfaces. The material of the annular body 21 needs to be able to withstand high pressure, and the material of the annular body 21 is beryllium bronze or stainless steel. The front conical surface 22 and the rear conical surface 23 of the annular body 21 are respectively abutted with two sealed pieces to form sealing surfaces. And the two conical surfaces are different in deformation modes aiming at different sealed pieces, so that the two conical