A locking ring type quick-opening blind flange sealing structure to prevent water accumulation and corrosion.

Abstract

This utility model provides a locking ring type quick-opening blind flange sealing structure to prevent water accumulation and corrosion, specifically relating to the field of quick-opening blind flange technology. It includes a flange blind seat, a flange blind cover, a locking ring, a safety mechanism, and a drainage system. The flange blind seat has an inner wall with a stepped conical annular groove with a drainage channel, the conical angle of which is 30°-45°. The flange blind cover has a double-stage conical surface matching the stepped conical annular groove on its outer periphery, with an annular water collection groove between the double-stage conical surfaces. This utility model forms a continuous flow path through the coordinated cooperation of the stepped conical annular groove and the double-stage conical surface, and, in conjunction with the annular water collection groove and circumferentially distributed inclined guide holes, achieves multi-directional drainage channels. The annular water collection groove adopts a U-shaped design to effectively collect liquid seeping in from different directions, and the hydrophobic micropores are arranged radially, avoiding the risk of axial leakage and adapting to the drainage needs of equipment in different installation postures.

Description

Technical Field

[0001] This utility model relates to the field of quick-opening blind flange technology, specifically to a locking ring type quick-opening blind flange sealing structure that prevents water accumulation and corrosion. Background Technology

[0002] As a critical sealing component in pressure vessels, pipelines, and other equipment, the reliability of quick-opening blind flanges directly impacts operational safety and maintenance efficiency. Traditional quick-opening blind flanges often employ a single-cone locking structure, achieving a seal by wedging the locking ring against the conical surface of the blind cover. However, long-term use presents the following problems: First, the sealing surface and locking structure of the blind flange are prone to corrosion due to environmental water accumulation or media residue, especially under humid conditions or large temperature differences. Water seeps into the sealing groove and is difficult to drain, accelerating the oxidation of metal components and reducing sealing performance and service life. Second, existing blind flange drainage designs often rely on external openings or simple guide channels, resulting in discontinuous drainage paths that are prone to blockage by foreign objects or structural dead angles, leading to water retention. Third, conventional locking ring structures are prone to uneven locking force and localized deformation during frequent opening and closing operations, and the ring locking method carries the risk of single-point failure.

[0003] Chinese patent CN201611138151.9 discloses a quick-opening blind flange for preventing water accumulation and corrosion. It mainly consists of a support rocker arm installed on a flange blind seat, a flange blind cover, a lifting screw, a locking ring, a safety ring, elastic locking ribs, and a rotating arm. Its structural features include: an inverted conical annular groove within the flange blind seat to accommodate the flange blind cover, forming a conical sealing pair structure; a locking ring and a safety ring embedded in the flange blind cover to form a blind cover locking structure; and a set of seepage holes on the flange blind seat. While ensuring a tight lock on the blind cover, the locking ring and safety ring are largely exposed, facilitating cleaning and maintenance. Even if corrosion causes the cover to become stuck, the locking ring can be manually pried open. This invention has significant advantages such as simple structure, low production cost, convenient installation and use, good drainage effect, strong corrosion resistance, easy and labor-saving opening operation, reliable operation, good sealing performance, stable operation, and long service life, showing great application prospects.

[0004] However, there are still some shortcomings that need to be improved:

[0005] 1. The linkage mechanism between the locking ring and the elastic locking rib is complex, and the excessive number of hinge points makes it prone to wear.

[0006] 2. The conical sealing pair lacks an axial compensation structure;

[0007] 3. The layout of the drainage holes did not take into account the drainage requirements of the blind flange in different orientations;

[0008] 4. The safety ring locking method has the risk of single point of failure.

[0009] To address this issue, a locking ring type quick-opening blind flange sealing structure that prevents water accumulation and corrosion is proposed. Utility Model Content

[0010] The purpose of this invention is to provide a locking ring type quick-opening blind flange sealing structure that prevents water accumulation and corrosion, so as to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, this utility model provides the following technical solution: a locking ring type quick-opening blind flange sealing structure for preventing water accumulation and corrosion, comprising a flange blind seat, a flange blind cover, a locking ring, a safety mechanism, and a drainage system, characterized in that: the inner wall of the flange blind seat is provided with a stepped conical annular groove with a drainage channel, the conical angle of which is 30°-45°; the outer periphery of the flange blind cover is provided with a double-stage conical surface matching the stepped conical annular groove, and an annular water collection groove is provided between the double-stage conical surfaces;

[0012] The locking ring is a segmented C-shaped structure, and its inner arc surface is provided with a wedge-shaped locking surface that mates with the upper part of the double-stage conical surface;

[0013] The safety mechanism includes lock lugs and resilient locking ribs symmetrically arranged at the opening end of the locking ring, and a handle for opening the safety.

[0014] The drainage system includes inclined guide holes evenly distributed along the circumference of the flange blind seat and hydrophobic micropores disposed within a conical annular groove. The inlet of the inclined guide holes is located at the bottom of the stepped conical annular groove, and the hydrophobic micropores connect the annular water collection tank to the external environment.

[0015] Preferably, the transition point of the two-stage conical surface is provided with an annular water collection trough with a U-shaped cross section.

[0016] Preferably, the hydrophobic micropores are radially disposed at the bottom of the annular water collection tank, connecting to the external environment of the flange blind seat to achieve radial drainage.

[0017] Preferably, the upper cone angle of the bi-stage conical surface is controlled to be 40°±2°, and the lower cone angle is 30°±2°.

[0018] Preferably, the mating end face of the flange blind seat and the flange blind cover is provided with a stepped sealing groove, and a composite sealing assembly consisting of a main sealing ring and a secondary sealing ring is provided in the groove.

[0019] Preferably, the safety mechanism has locking lugs at both ends of a segmented C-shaped symmetrically arranged locking ring. An elastic locking rib is hinged to the locking lug at one end of the locking ring, and the other end of the elastic locking rib is connected to another locking lug. A rotating arm is connected above the elastic locking rib, and the other end of the rotating arm is connected to symmetrically arranged locking rings and other components. A handle is fixedly connected to the center of the rotating arm.

[0020] The beneficial effects of this utility model are:

[0021] 1. This utility model forms a continuous flow path through the coordinated cooperation of a stepped conical annular groove and a double-stage conical surface. Combined with an annular water collection tank and circumferentially distributed inclined guide holes, it realizes a multi-directional drainage channel. The annular water collection tank adopts a U-shaped design to effectively collect liquids seeping in from different directions. The hydrophobic micropores are arranged radially to avoid the risk of axial leakage and adapt to the drainage needs of equipment in different installation postures. Compared with the traditional structure, this drainage system has a significantly improved drainage efficiency and effectively eliminates the phenomenon of water accumulation.

[0022] 2. This utility model uses a segmented C-shaped locking ring combined with a wedge-shaped locking surface to make the locking force evenly distributed along the circumference; the safety mechanism adopts a symmetrically arranged locking lug and elastic locking rib linkage design, and achieves dual-point synchronous locking through the rotating arm to eliminate the risk of single-point failure. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the insurance institution of this utility model.

[0025] Figure 3 This is a schematic diagram of the drainage mechanism of this utility model.

[0026] Figure 4 This is a schematic diagram of the drainage mechanism of this utility model.

[0027] The components in the attached diagram are labeled as follows: 1: Flange blind seat, 2: Flange blind cover, 201: Main sealing ring, 202: Secondary sealing ring, 3: Locking ring, 31: Wedge-shaped locking surface, 41: Locking lug, 42: Elastic locking rib, 43: Rotary arm, 44: Handle, 51: Inclined guide hole, 52: Hydrophobic micropore, 6: Conical annular groove, 7: Double-stage conical surface, 8: Annular water collection groove Detailed Implementation

[0028] Although this invention may be described with respect to a particular application or industry, those skilled in the art will recognize its broader applicability. Those skilled in the art will understand that terms such as "above," "below," "upward," "downward," etc., are used to describe the drawings and not to indicate a limitation on the scope of the invention as defined by the appended claims. Any numerical designations such as "first" or "second" are merely illustrative and not intended to limit the scope of the invention in any way.

[0029] Example 1: A locking ring type quick-opening blind flange sealing structure to prevent water accumulation and corrosion, such as Figure 1-4As shown, the system includes a flange blind seat 1, a flange blind cover 2, a locking ring 3, a safety mechanism, and a drainage system. The flange blind seat 1 is integrally formed from forged steel, and its inner wall is machined with a stepped conical annular groove 6. The conical annular groove 6 is divided into a double-stage conical surface 7, with the upper section having a cone angle of 40°±2° and the lower section having a cone angle of 30°±2°. Eight inclined guide holes 51 are evenly distributed circumferentially at the bottom of the conical annular groove 6, with the hole axis inclined downward at a 15° angle to the horizontal plane. A U-shaped annular water collection groove 8 is machined on the surface of the conical annular groove 6, with eight radially distributed drainage micropores 52 evenly distributed at the bottom of the groove, with the hole diameter spacing evenly distributed circumferentially.

[0030] A U-shaped cross-section annular water collection groove 8 is provided at the transition of the double-conical surface 7. The mating end face of the flange blind cover 2 and the flange blind seat 1 is provided with a stepped sealing groove. The built-in main sealing ring 201 and the secondary sealing ring 202 form a composite sealing assembly.

[0031] The locking ring 3 is a symmetrical segmented C-shaped structure, consisting of two arc segments. The inner arc surface is machined with a wedge-shaped locking surface 31, which forms a line contact with the upper section of the double-stage conical surface 7. The locking ring 3 has symmetrically welded locking lugs 41 at the open end. One of the locking lugs 41 is hinged to an elastic locking rib 42. The free end of the elastic locking rib 42 is connected to the other locking lug 41 through a buckle. A rotating arm 43 is welded to the middle of the elastic locking rib 42. A handle 44 is connected to the middle of the rotating arm 43. The flange blind cover 2 is opened by rotating the handle 44.

[0032] Sealing stage: When the flange blind cover 2 is embedded in the flange blind seat 1, the double-stage conical surface 7 and the stepped conical annular groove 6 form a double-fit guide. The locking ring 3 drives the rotating arm 43 to make a circumferential contraction movement through the handle 44. The wedge-shaped locking surface 31 generates radial clamping force along the upper part of the double-stage conical surface, causing the main sealing ring 201 to generate compression. The secondary sealing ring 202 generates elastic deformation to fill the micro gap, forming a double sealing barrier.

[0033] Drainage stage: When ambient water seeps in through the gap between the flange blind seat 1 and the blind cover 2, it is guided by the lower conical surface of the stepped conical annular groove 6 and flows into the annular water collection tank 8. Under the action of gravity, the water is discharged in two ways: First, the main water flows out axially through the inclined guide hole 51; Second, the residual water film seeps out radially through the capillary action of the hydrophobic micropores 52. The conical angle design ensures the drainage speed and keeps the contact surface dry to avoid corrosion.

[0034] Operation of the safety mechanism: In the locked state, the elastic locking rib 42 generates a pre-tightening force to lock the locking lug 41. When opening, pressing down the handle 44 drives the rotating arm 43 to overcome the deformation force of the elastic locking rib. When the handle rotation angle is greater than 30°, the opening of the locking ring 3 expands by 4-5mm, and the wedge-shaped locking surface 31 is released from compression, realizing quick unlocking.

[0035] The embodiments described above are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications, improvements, and substitutions without departing from the inventive concept, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A locking ring type quick-opening blind flange sealing structure for preventing water accumulation and corrosion, comprising a flange blind seat (1), a flange blind cover (2), a locking ring (3), a safety mechanism, and a drainage system, characterized in that: The inner wall of the flange blind seat (1) is provided with a stepped conical annular groove (6) with a drainage channel, and the cone angle is 30°-45°; the outer periphery of the flange blind cover (2) is provided with a double-stage conical surface (7) that matches the stepped conical annular groove (6), and an annular water collection groove (8) is provided between the double-stage conical surfaces (7). The locking ring (3) is a segmented C-shaped structure, and its inner arc surface is provided with a wedge-shaped locking surface (31) that cooperates with the upper section of the double-stage conical surface (7). The safety mechanism includes a locking lug (41) and a resilient locking rib (42) symmetrically arranged at the open end of the locking ring (3), and a handle (44) for opening the safety. The drainage system includes inclined guide holes (51) evenly distributed around the flange blind seat (1) and hydrophobic micropores (52) provided in the conical annular groove (6). The inlet of the inclined guide hole (51) is located at the bottom of the stepped conical annular groove (6), and the hydrophobic micropores (52) connect the annular water collection tank (8) with the external environment.

2. A lock-ring type quick-opening blind plate sealing structure capable of preventing accumulated water from causing corrosion, according to claim 1, characterized in that: The transition of the double-conical surface (7) is provided with an annular water collection trough (8) with a U-shaped cross section.

3. A lock-ring type quick-opening blind plate sealing structure for preventing accumulated water corrosion according to claim 1, characterized in that: The hydrophobic micropores (52) are radially arranged at the bottom of the annular water collection tank (8) and connect to the external environment of the flange blind seat (1) to achieve radial drainage.

4. The locking ring type quick-opening blind flange sealing structure for preventing water accumulation and corrosion as described in claim 1, characterized in that: The upper cone angle of the double-stage cone surface (7) is controlled at 40°±2°, and the lower cone angle is 30°±2°.

5. A lock-ring type quick-opening blind plate sealing structure for preventing accumulated water corrosion according to claim 1, characterized in that: The flange blind seat (1) and the flange blind cover (2) have a stepped sealing groove on their mating end face, and a composite sealing assembly consisting of a main sealing ring (201) and a secondary sealing ring (202) is provided in the groove.

6. The locking ring type quick-opening blind flange sealing structure for preventing water accumulation and corrosion as described in claim 1, characterized in that: The insurance mechanism is provided with locking lugs (41) at both ends of a segmented C-shaped symmetrically arranged locking ring (3). An elastic locking rib (42) is hinged to the locking lug (41) at one end of the locking ring (3). The other end of the elastic locking rib (42) is connected to another locking lug (41). A rotating arm (43) is connected above the elastic locking rib (42). The other end of the rotating arm (43) is connected to the symmetrically arranged locking ring (3), and a handle (44) is fixedly connected to the center of the rotating arm (43).

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