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RU-2861487-C2 - SEALING STRUCTURE, STORAGE TANK BREATHER VALVE, AND STORAGE TANK

RU2861487C2RU 2861487 C2RU2861487 C2RU 2861487C2RU-2861487-C2

Abstract

FIELD: storage tank engineering. SUBSTANCE: this application discloses a sealing structure, a storage tank breather valve, and the storage tank itself. The sealing structure comprises a valve seat and a valve disc arranged opposite each other and used for tight sealing against each other, wherein the adjoining sealing surface of one element of the valve disc and the valve seat has an inner annular groove and an outer annular groove surrounding the inner annular groove, and the adjoining sealing side of the other element of the valve disc and the valve seat has an inner annular sealing protrusion arranged coaxially with the inner annular groove, and an outer annular sealing protrusion arranged coaxially with the outer annular groove, wherein a flexible sealing membrane closes the inner annular groove and the outer annular groove. When the valve seat and the valve disc are in a tight seating state, the inner annular sealing protrusion enters, at least partially, the inner annular groove, the outer annular sealing protrusion enters, at least partially, the outer annular groove, and the flexible sealing membrane, under the action of the respective tips of the inner annular sealing protrusion and the outer annular sealing protrusion, elastically extends towards the inner annular groove and the outer annular groove. EFFECT: improving the tightness and safety of the storage tank breather valve and the storage tank itself. 23 cl, 10 dwg

Inventors

  • CHENG LONGJUN
  • LI RONGBIN
  • DANG WENYI
  • TAO BIN
  • LIU JUAN
  • WANG SHIQIANG
  • LI LIANGLIANG
  • SUN MINGYUAN
  • ZHANG YUPING
  • ZHANG RUIYU

Dates

Publication Date
20260505
Application Date
20240311
Priority Date
20230410

Claims (20)

  1. 1. A sealing structure comprising:
  2. a valve seat (4) and a valve disc (8) which are located opposite each other and are used to tightly seal against each other, wherein the adjacent sealing surface of one element of the valve disc (8) and the valve seat (4) has an inner annular groove (82) and an outer annular groove (83) surrounding the inner annular groove (82), and the adjacent sealing side of the other element of the valve disc (8) and the valve seat (4) has an inner annular sealing lip (41) located in line with the inner annular groove (82), and an outer annular sealing lip (42) located in line with the outer annular groove (83),
  3. a flexible sealing membrane (5) which is located on the adjacent sealing surface and covers the inner annular groove (82) and the outer annular groove (83),
  4. wherein, when the valve seat (4) and the valve plate (8) are in the sealing state, the inner annular sealing protrusion (41) at least partially enters the inner annular groove (82), the outer annular sealing protrusion (42) at least partially enters the outer annular groove (83), and the flexible sealing membrane (5), which is pushed by the corresponding tips of the inner annular sealing protrusion (41) and the outer annular sealing protrusion (42), elastically enters the inner annular groove (82) and the outer annular groove (83).
  5. 2. The sealing structure according to claim 1, in which there is, respectively, one inner annular groove (82), one outer annular groove (83), one inner annular sealing projection (41) and one outer annular sealing projection (42), or there are several inner annular grooves (82), several outer annular grooves (83), several inner annular sealing projections (41) and several outer annular sealing projections (42), distributed, respectively, in the form of concentric circles.
  6. 3. The sealing structure according to claim 1, in which the inner annular groove (82) and the outer annular groove (83) have a recessed shape on the adjacent sealing surface of the valve plate (8), the flexible sealing membrane (5) covers the adjacent sealing surface of the valve plate (8), and the inner annular sealing lip (41) and the outer annular sealing lip (42) are formed on the adjacent sealing side of the valve seat (4),
  7. optionally, the flexible sealing membrane (5) is tightly pressed against the adjacent sealing surface of the valve plate (8) by a round membrane fixing plate (6).
  8. 4. The sealing structure according to claim 1, in which the tips of the inner annular sealing protrusion (41) and the outer annular sealing protrusion (42) are made in the form of sharp-angled ends for pushing the flexible sealing membrane (5), and the contact surface of the tip of the sharp-angled end, in contact with the flexible sealing membrane (5), is made in the form of an arcuate surface,
  9. optionally, the internal angle of the acute-angled end has a value in the range from 45° to 75°,
  10. Optionally, the arc surface diameter of the arc has a value in the range of 0.1 mm to 0.3 mm.
  11. 5. The sealing structure according to claim 1, in which the height to which the outer annular sealing projection (42) projects is greater than the height to which the inner annular sealing projection (41) projects,
  12. optionally, the difference between the height to which the outer annular sealing projection (42) projects and the height to which the inner annular sealing projection (41) projects has a value in the range of 0.1 mm to 0.8 mm.
  13. 6. The sealing structure according to claim 1, in which the side wall of the inner annular groove (82) and the side wall of the outer annular groove (83) are made in the form of a smooth arc transition, respectively, in an angular connection with the adjacent sealing surface of the valve plate (8),
  14. optionally, the arc transition angle has a value in the range from 1.1 rad to 1.2 rad.
  15. 7. The sealing structure according to claim 1, further comprising a shock-absorbing ring (9) located in the recess of the outer annular groove (83), wherein the tip of the outer annular sealing protrusion (42) pushes the flexible sealing membrane (5) in the direction of the shock-absorbing ring (9),
  16. optionally, the shock-absorbing ring (9) is made of polyurethane elastomer.
  17. 8. A sealing structure according to any one of claims 1 to 7, wherein the flexible sealing membrane (5) comprises a polymer sheet layer (51) and a fluororubber composite layer (52) laminated together,
  18. optionally, the fluororubber composite layer (52) is made from a raw material composition containing fluororubber, an inorganic filler, an acid absorber, a vulcanizing agent, a release agent and a dye,
  19. optionally, the polymer sheet that forms the polymer sheet layer (51) is selected from one or more of polyetheretherketone, polytetrafluoroethylene and polyimide,
  20. optionally, the polymer sheet layer (51) has a thickness of 0.1 mm to 1 mm,

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority from the filing date of Chinese Patent Application No. 202310372469.7 filed on April 10, 2023, Chinese Patent Application No. 202311168691.1 filed on September 11, 2023, Chinese Patent Application No. 202311168701.1 filed on September 11, 2023, and Chinese Patent Application No. 202322458198.5 filed on September 11, 2023, the contents of which are incorporated herein by reference. FIELD OF INVENTION The present application relates to the technical field of storage tanks, in particular to a sealing structure, a breather valve of a storage tank and a storage tank. BACKGROUND OF THE INVENTION A tank vent valve, one of the tank's safety devices, is used to reduce losses from the evaporation of volatile liquid in the tank at atmospheric or reduced pressure. The tank vent valve not only maintains gas pressure balance in the tank, preventing damage to the tank due to excess or negative pressure, but also reduces evaporation and liquid loss in the tank by utilizing the tank's load-bearing capacity. Thus, the tank vent valve plays a vital role in ensuring safety and protecting the environment. Under normal operating conditions, the storage tank breather valve begins to draw air into the tank as soon as the tank dispenses the contained material; the storage tank breather valve begins to release gas in the tank as soon as the material is introduced into the tank; the storage tank breather valve releases steam or admits air or nitrogen as the vapor pressure of the material in the tank increases or decreases due to climate change or other factors. The sealing structures of existing storage tank breathers are weak (e.g., only one seal is used), resulting in unstable sealing performance and leakage problems during long-term use. Once the storage tank breather valve fails, serious safety and environmental risks will arise in the area where the storage tank is located, making it difficult to ensure personal safety and/or property security. ESSENCE OF THE INVENTION The purpose of this application is to create a sealing structure, a breather valve for a storage tank, and the storage tank itself. The sealing structure has a simple design, effectively improves the tightness, safety, and environmental friendliness of the breather valve and storage tank, and ensures the safety of people and property. In order to achieve the above objective, in the first aspect, the present application proposes a sealing structure that comprises: a valve seat and a valve plate located opposite each other and used to fit tightly against each other, wherein a tight sealing surface of one element of the valve plate and the valve seat has an inner annular groove and an outer annular groove surrounding the inner annular groove, and a tight sealing side of the other element of the valve plate and the valve seat has an inner annular sealing lip located in alignment with the inner annular groove, and an outer annular sealing lip aligned with the outer annular groove; a flexible sealing membrane which is located on the adjacent sealing surface and covers the inner annular groove and the outer annular groove; wherein, when the valve seat and the valve plate are in a sealing state, the inner annular sealing protrusion at least partially enters the inner annular groove, the outer annular sealing protrusion at least partially enters the outer annular groove, and the flexible sealing membrane, which is pushed by the corresponding tips of the inner annular sealing protrusion and the outer annular sealing protrusion, elastically protrudes in the direction of the inner annular groove and the outer annular groove. In embodiments of the present invention, there is, respectively, one inner annular groove, one outer annular groove, one inner annular sealing lip and one outer annular sealing lip, or there are several inner annular grooves, several outer annular grooves, several inner annular sealing lip and several outer annular sealing lip arranged in the form of concentric circles. In embodiments of the present invention, the inner annular groove and the outer annular groove are formed on the adjacent sealing surface of the valve plate in a recessed form, the flexible sealing membrane covers the adjacent sealing surface of the valve plate, and the inner annular sealing projection and the outer annular sealing projection are formed on the adjacent sealing side of the valve seat; Optionally, the flexible sealing membrane is pressed against the adjacent sealing surface of the valve plate by a round membrane mounting plate. In embodiments of the present invention, the tips of the inner annular sealing projection and the outer annular sealing projection are made in the form of sharp-angled ends for pushing the flexible sealing membrane, and the contact surface of the tip of the sharp-angled end, which contacts the flexible sealing membrane, is made in the form of an arcuate surface; optionally, the i