A cable cone seal structure

Abstract

This invention discloses a cable conical sleeve sealing structure, including a sealing cylinder, a conical sleeve, a sealing ring, a sealing cover, and a cable body. It utilizes the principle of compression and sealing expansion of the sealing ring by the spaced-grooved conical sleeve. As the sealing cover moves towards the sealing cylinder, the angled inner conical surface of the sealing cover applies pressure to the conical sleeve in both radial and axial directions. After radial compression, the conical sleeve utilizes N circumferentially protruding ribs on the inner surface of the sealing ring to provide N circumferential isolation seals to the cable sheath surface. Simultaneously, the sealing ring is axially compressed through the axial component of the force, which in turn compresses the pressure-bearing surface of the sealing cylinder. This achieves end-face sealing between the sealing cylinder end face and the sealing ring end face, ensuring the static and dynamic sealing performance of the cable. Furthermore, the corresponding sealing pressure value can be obtained based on the magnitude of the axial force of the axial displacement of the sealing cover, thereby meeting the requirements for deep-water high-pressure sealing.

Description

Technical Field

[0001] This invention belongs to the field of bridge technology, specifically relating to a cable cone sleeve sealing structure. Background Technology

[0002] Currently, the anchorages for conventional cables are as follows: Figure 1 As shown, the cable anchor is composed of components such as an anchor cup, a sealing cylinder 1, a dustproof ring 7, a positioning ring 8, and an HDPE heat shrink sleeve 9. The anchor cup and the sealing cylinder 1 are connected by threads, and the sealing cylinder 1 and the cable body 5 are usually sealed with an HDPE heat shrink sleeve 9. The heat shrink sleeve is mainly made of PE (polyethylene), which is susceptible to damage and aging caused by the construction and operating environment of the cable, such as temperature changes, ultraviolet radiation, rain, and corrosion from harmful gases. This can lead to water and harmful media entering the cable anchor, causing corrosion of the cable wires and anchor failure, thus threatening the safety of the cable.

[0003] With the limited space in shallow water and shallow sea areas, and the increasing number of challenging working environments in deep water and deep sea areas, the development of structural cables for deep water and deep sea has become a priority. One of the key technologies for this type of cable is the sealing performance of the cable anchoring structure under the high pressure of deep water conditions. One of the most critical factors affecting the overall sealing performance of the cable anchoring structure is the sealing performance between the cable sealing sleeve and the HDPE cable sheath. Moreover, in deep water environments of hundreds or thousands of meters, the water pressure can exceed 10 MPa. Currently, deep-sea engineering problems within 3000 meters are a hot topic in my country's marine engineering academic and industrial sectors. The overall sealing performance of the cable anchoring structure must withstand the deep water pressure of 30 MPa. Relying on the existing conventional HDPE heat shrink sleeve covering the sealing sleeve is clearly insufficient to achieve an effective seal.

[0004] Existing cable sealing structures, such as the domestic patent application No. 201510564926.8 "New Waterproof Sealing Structure for Cable Ends", use a sealing ring on the cable sheath surface for sealing the outer surface of the cable. A sealing cover with a HAF structure is installed outside the sealing ring to achieve sealing of the cable outer surface by compressing the sealing ring. This method is not effective in sealing the cable sheath surface, mainly due to two factors: First, the outer circular surface of the cable is not a complete circle. According to GB / T18365-2018 "Hot-extruded polyethylene high-strength steel wire cable for cable-stayed bridges", the outer diameter of the HDPE sheath has an outer diameter tolerance of -1 to +2 mm during the manufacturing process. Generally, a grooved O-ring is used. The O-ring has a circular cross-sectional shape. The overall cross-sectional size of the O-ring is limited. The convex shaft sealing surface that matches the O-ring can only provide limited compressive stress to the O-ring surface during installation. Moreover, this compressive stress is limited when the O-ring is installed and cannot be adjusted. Therefore, the O-ring's deformation during compression is limited, as is the contact area with the HDPE sheath. This sealing method is prone to leakage if there are even slight unevenness on the cable sheath surface or if the cable vibrates, causing the seal position to shift or slip. The sealing performance has low tolerance and reliability. Secondly, due to the use of a HAF-structured sealing cover for compression, the edges of the sealing cover are easily scratched on the outer surface of the sealing ring when the two halves are snapped shut, creating gaps. During cable vibration or oscillation, water can penetrate into the cable anchor through these gaps, corroding the steel wire.

[0005] Other structures, such as the rubber sealing ring described in domestic patent application number 202220238789.4, "A Sealing Structure for the Portion of a Cable Conduit," are still installed in the groove as in the above case. The sealing ring has a small circular cross-section. Due to the limited size of the sealing ring and the limitations of the compression structure, the compression deformation of the sealing ring is also relatively limited. If there are manufacturing errors in the production process of the HDPE sheath of the cable, or if the cable vibrates and causes the sealing position to wobble or slip, leakage will occur at the sealing point of the cable sheath. At the same time, the sealing cover is a Haver-type structure. When the two halves of the sealing cover structure are fastened, the edge of the sealing cover is also very easy to scratch the outer surface of the sealing ring, resulting in gap defects. During the vibration or swing of the cable, water can penetrate into the cable anchor through these gap defects, causing corrosion to the steel wire.

[0006] Other structures, such as the domestic patent application No. 202120972100.6 "A Cable Sealing Structure and a Cable with a Sealing Structure," improve the sealing ring in the cable sealing structure by using a rectangular cross-section sealing ring with a larger deformable compression capacity to increase the contact area after compression deformation, avoiding line contact sealing and thus preventing leakage problems when facing cable sheath manufacturing tolerances. However, the structure of this sealing cover is still a two-half Haver structure. When the two halves of the sealing cover structure are fastened, the edges of the sealing cover are also very easy to scratch the outer surface of the sealing ring, resulting in gap defects. During cable vibration or swinging, water can seep into the cable anchor through these gap defects, which can still easily corrode the steel wire.

[0007] The information disclosed in the above background section is only intended to enhance the understanding of the overall background of the present invention, and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0008] To address the above shortcomings, this invention provides a cable conical sleeve sealing structure. Through the conical compression and tightening sealing characteristics of this structure, the corresponding sealing pressure value can be obtained according to the magnitude of the axial force of the axial displacement of the sealing cover, thereby achieving the requirements of deep-water high-pressure sealing. The cable body can swing in any direction within a certain range of angles along the axis while still ensuring sealing performance, thereby achieving dynamic sealing performance of the cable.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A cable conical sleeve sealing structure includes a sealing cylinder, a conical sleeve, a sealing ring, a sealing cover, and a cable body. The sealing cylinder, sealing ring, and sealing cover are sequentially sleeved on the cable body. One end of the sealing ring abuts against the end of the sealing cylinder. The conical sleeve is a conical collar and a compressible elastic component. The conical sleeve is disposed between the inner cavity of the sealing cover and the sealing ring. The sealing cover is axially movable and sealed to the sealing cylinder, so that the inner cavity of the sealing cover applies circumferential and radial compressive forces to the conical sleeve when it moves. The sealing ring uses the compressive force of the conical sleeve to perform circumferential and radial compression sealing on the sheath surface of the cable body and the end of the sealing cylinder, respectively.

[0011] As the sealing cover moves toward the sealing cylinder, the inner surface of the sealing cover applies pressure to the tapered sleeve in both radial and axial directions. The tapered sleeve can achieve uniform inward circumferential compression deformation and axial compression deformation. After being radially compressed, the tapered sleeve provides circumferential compressive stress to the large-sized sealing ring by compressing it inward, thus circumferentially compressing the surface of the cable sheath. Under the action of the radial component force, the sealing ring exerts a strong clamping force on the cable sheath surface, similar to a "flexible interlocking" function, thereby isolating and sealing the surface of the cable sheath. At the same time, when the tapered sleeve is axially compressed, it compresses the sealing ring axially through the axial component force. The sealing ring then compresses the pressure-bearing surface of the sealing cylinder through the axial component force, achieving end-face sealing between the end face of the sealing cylinder and the end face of the sealing ring.

[0012] Specifically, the conical sleeve is a conical collar structure with spaced grooves.

[0013] The spaced-groove conical sleeve structure of this design adopts a complete circular structure, avoiding the potential risks of damage to the sealing ring surface and gap defects caused by directly snapping and compressing the sealing ring with a two-part sealing cover. The annular conical sleeve with spaced-groove design uniformly compresses the sealing ring circumferentially, maximizing the protection of the sealing ring structure and maximizing its sealing performance.

[0014] Specifically, the spacer groove includes multiple longitudinally extending slots provided on the conical sleeve.

[0015] Specifically, the plurality of longitudinally extending slots include a first longitudinal slot and a second longitudinal slot that are opened from both ends of the conical sleeve toward the middle of the conical sleeve and are evenly spaced.

[0016] The conical sleeve has a slotted design with slots at both ends. The sealing ring can be completely fitted into the slotted conical sleeve. When the sealing cover moves toward the sealing cylinder, the sealing cover can circumferentially compress the conical sleeve. After the conical sleeve is compressed, the N circumferential convex ribs on the inner hole surface of the sealing ring circumferentially compress the surface of the cable sheath. The N annular convex ribs on the inner hole surface of the sealing ring provide N-level isolation and sealing for the surface of the cable sheath.

[0017] Specifically, the inner surface of the sealing ring has N circumferential protruding ribs, where N is greater than or equal to 1. The outer diameter of the sealing ring matches the inner diameter of the tapered sleeve, and the two can be interlocked to form a compression sealing component.

[0018] The sealing ring of this structural design uses a large cross-sectional area elastic material. The inner surface of the sealing ring has N circumferential convex ribs with a height greater than 2mm. When compressed, it can provide a large enough amount of compression to compensate for the outer diameter error of -1 to +2mm in the hot-extruded HDPE sheath of the cable during the manufacturing process, thereby further improving the fault tolerance and reliability of the overall structural seal.

[0019] Specifically, the inner cavity of the sealing cover has a conical structure, and the taper of the conical sleeve 2 is greater than or equal to the taper of the inner cavity of the sealing cover.

[0020] Specifically, the taper angle of the tapered sleeve is between 0.5° and 45°.

[0021] Preferably, the outer circular surface of the sealing cylinder and the inner circular surface of the sealing cover are respectively provided with external connecting threads and internal connecting threads, and the sealing cylinder and the sealing cover are connected by threads.

[0022] Preferably, flanges are provided at the bottom of the sealing cover and on the outer circle of the sealing cylinder, and the two flanges are connected by screws.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Due to the conical compression and tightening sealing characteristics of this design, the cable body can swing in any direction within a certain range of angles along the axis. Even if the cable vibrates and causes the sheath to wobble or slip, the sealing ring can still tightly bite the sheath surface, ensuring the sealing performance and thus achieving reliable dynamic sealing performance of the cable.

[0025] 2. The greater the displacement of the sealing cover towards the sealing cylinder, the greater the deformation of the compression sealing ring, and the greater the sealing pressure it can withstand. Based on the corresponding displacement, the deformation of the sealing ring, and the magnitude of the axial force that drives the axial displacement of the sealing cover, the corresponding sealing pressure value can be obtained, thereby achieving the requirements of deep-water high-pressure sealing. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an existing cable-sealed structure.

[0027] Figure 2 This is a schematic diagram of a cable conical sleeve sealing structure according to the present invention.

[0028] Figure 3 This is an axial view of the tapered sleeve of the present invention.

[0029] Figure 4 This is a side view of the conical sleeve of the present invention.

[0030] Figure 5 This is an axial view of the sealing ring of the present invention.

[0031] Figure 6 This is a side view of the sealing ring of the present invention.

[0032] Figure 7 This is a schematic diagram of the combination of the cone sleeve and the sealing ring of the present invention.

[0033] Figure 8 This is a schematic diagram of another embodiment of the cable conical sleeve sealing structure of the present invention.

[0034] In the figure, 1-sealing cylinder, 101-connecting external thread, 102-second flange, 2-conical sleeve, 201-small end, 202-large end, 203-first longitudinal groove, 204-second longitudinal groove, 3-sealing ring, 301-sealing ring inner hole, 302-outer protruding rib, 4-sealing cover, 401-sealing cover inner cavity, 402-connecting internal thread, 403-first flange, 5-cable body, 501-cable sheath, 6-screw, 7-dust ring, 8-positioning ring, 9-HDPE heat shrink sleeve. Detailed Implementation

[0035] To illustrate the technical content, objectives, and effects of this invention in detail, the following description is provided in conjunction with embodiments and accompanying drawings. It should be understood that in the description of these embodiments, terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this embodiment and simplifying the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0036] This embodiment discloses a cable cone sleeve sealing structure for sealing at cable anchorages. (Refer to...) Figure 2 As shown, the overall structure of this solution consists of a perforated sealing cover 4, a conical sleeve 2, a sealing ring 3, a sealing cylinder 1, and a cable body 5 with an HDPE cable sheath 501. The sealing cylinder 1 and the sealing ring 3 are sequentially fitted onto the cable body 5, with one end of the sealing ring 3 abutting against the end of the sealing cylinder 1, and the conical sleeve 2 fitted over the sealing ring 3; the sealing cover 4 is fitted onto the cable body 5, and the sealing cover 4 is axially movable and sealed to the sealing cylinder 1.

[0037] refer to Figure 3 , 4 The schematic diagram of the conical sleeve shown is shown. The conical sleeve 2 is a conical collar and a compressible elastic component. It can be made of materials with a low coefficient of friction and certain elastic properties. The range of materials to be selected includes various metal materials with good elastic modulus, such as steel, copper, aluminum, nickel, titanium, tungsten, alloy steel and various metal alloy materials, as well as non-metallic materials with good elastic modulus, such as polyurethane, polytetrafluoroethylene, nylon, plastics, fibers, polymer synthetic materials and elastomer materials, etc.

[0038] Specifically, the conical sleeve 2 is a conical collar structure with spaced grooves, such as... Figure 3As shown, the spaced groove includes a plurality of longitudinally extending slots provided on the conical sleeve 2. The slots are a plurality of first longitudinal grooves 203 that are opened from the small opening end 201 of the conical sleeve 2 to the large opening end 202 of the conical sleeve 2 and are evenly spaced, and a plurality of second longitudinal grooves 204 that are opened from the large opening end 202 of the conical sleeve 2 to the small opening end 201 of the conical sleeve 2 and are evenly spaced. Each first longitudinal groove 203 and each second longitudinal groove 204 are arranged adjacent to each other and parallel to each other. The closed portion of the first longitudinal groove 203 and the second longitudinal groove 204 extends at least to the middle of the conical sleeve 2, and preferably extends to the vicinity of the opposite end to form a more uniform elasticity.

[0039] refer to Figure 5 , 6 The schematic diagram of sealing ring 3 shows that it is made of a large cross-sectional area elastic material. The inner hole 301 of the sealing ring has N circumferentially protruding ribs 302, each with a height greater than 2mm. Under compression, these ribs can provide sufficient compression to compensate for the -1 to +2mm outer diameter error of the hot-extruded HDPE sheath during the cable manufacturing process, further improving the overall structural sealing tolerance and reliability. The outer diameter of the sealing ring 3 matches the inner diameter of the tapered sleeve 2, and the two can be interlocked to form a compression sealing component. Figure 7 As shown. The number N of the outwardly protruding ribs 302 on the surface of the inner hole 301 of the sealing ring is a natural number greater than or equal to 1, and is specifically set according to the length of the sealing ring 3.

[0040] In this embodiment, the inner cavity 401 of the sealing cover 4 can be set as a conical structure with reference to the shape of HDPE heat shrink sleeve in the prior art. The difference is that the taper of the conical sleeve 2 is greater than or equal to the taper of the inner cavity 401 of the sealing cover, wherein the taper angle of the conical sleeve 2 is preferably between 0.5° and 45°.

[0041] The principle of this embodiment is as follows: Unlike conventional grooved O-rings where the compression amount cannot be adjusted after installation, this solution utilizes the compression and sealing expansion principle of the sealing ring 3 compressed by the spaced grooved conical sleeve 2. When the spaced grooved conical sleeve 2 compresses the sealing ring 3 circumferentially inward and axially, the conical sleeve 2 provides uniform circumferential inward pressure and axial force to the sealing ring 3. Simultaneously, the sealing ring 3 applies circumferential outward pressure and reverse axial force to the conical sleeve 2. Under the action of the conical surface with a certain angle, an expansion function is formed, causing the N annular protruding ribs 302 on the surface of the inner hole 301 of the sealing ring to tightly engage with the surface of the cable sheath 501, thereby forming N isolation seals on the surface of the cable sheath 501. Through sealing in these two directions, a static or dynamic seal is achieved between the sealing cylinder 1 and the cable sheath 501. The greater the displacement of the sealing cover 4 towards the sealing cylinder 1, the greater the deformation of the compression sealing ring 3, the more significant the expansion effect, and the greater the sealing pressure it can withstand, thus meeting the requirements for deep-water high-pressure sealing.

[0042] The conical sleeve 2 is designed as a conical collar structure with spaced grooves. The spaced grooves provide space for compression deformation, solving the problem that a conical sleeve with a single conical surface cannot achieve a tight seal through contact and axial compression via the rigid sealing cover cavity 401. It also solves the problem that violent axial compression may cause deformation of the conical sleeve 2, resulting in permanent damage. By designing the conical sleeve 2 as a spaced groove with bidirectional slots at both ends, as... Figure 7 As shown, the longitudinal groove of the tapered sleeve 2 and the circumferential outward convex rib 302 of the sealing ring 3 both undergo a certain tension deformation. At the same time, under the compression and sealing tension of the tapered sleeve 2 and the sealing ring 3, the sealing ring 3 tightly bites the surface of the cable sheath 501. Even if the cable vibrates and causes the sheath to wobble or slip, the sealing ring 3 can still tightly bite the surface of the sheath to achieve a reliable sealing effect.

[0043] Simultaneously, in this embodiment, the inward compression of the tapered sleeve 2 can be adjusted by changing the amount of movement of the sealing cover 4 towards the sealing cylinder 1. When the tapered sleeve 2 is axially compressed, the sealing ring 3 is axially compressed through the axial component force. The sealing ring 3, through the axial component force, compresses the pressure-bearing surface of the sealing cylinder 1, achieving end-face sealing between the end face of the sealing cylinder 1 and the end face of the sealing ring 3. Through sealing in both directions, static or dynamic sealing between the sealing cylinder 1 and the cable sheath 501 is achieved. The compression amount of the sealing ring 3 is matched to the outer diameter error of the HDPE cable sheath 501 and the swaying and slippage caused by cable vibration, thereby achieving the surface sealing performance of the cable sheath 501 and providing sealing tolerance and reliability for the surface of the cable sheath 501. Ultimately, the objective of this embodiment is achieved.

[0044] As a preferred technical solution in this embodiment, refer to Figure 2 As shown, in this embodiment, the sealing cover 4 is axially movable and sealed to the sealing cylinder 1. The specific connection structure is as follows: the outer circular surface of the sealing cylinder 1 and the inner circular surface of the sealing cover 4 are respectively provided with external connecting threads 101 and internal connecting threads 402. The sealing cylinder 1 and the sealing cover 4 are connected by threads to achieve axial and radial compression of the cone sleeve 2 by the sealing cover 4. Before the anchors are made at both ends of the cable body 5, the sealing cover 4 is installed on the cable body 5. The cone sleeve 2 is inserted into the sealing cover 4, and the sealing ring 3 is then inserted into the cone sleeve 2. The sealing cover 4 is moved axially toward the sealing cylinder 1. The sealing cover 4 and the sealing cylinder 1 are connected by threads. The axial movement of the sealing cover 4 is achieved by screwing the threads into the sealing cover 4.

[0045] In addition to the threaded connection with the sealing cylinder 1 mentioned above, the sealing cover 4 can also move axially by having a first flange 403 and a second flange 102 respectively installed at the bottom of the sealing cover 4 and on the outer circumference of the sealing cylinder 1, connected by screws 6 to achieve axial movement. Figure 8 As shown.

[0046] The performance comparison of the cable-cone sleeve sealing structure in this embodiment with existing technologies, as tested experimentally, is as follows:

[0047] Comparison effect

[0048]

[0049] Based on the comparison of the above indicators, the performance of this embodiment is superior to that of the prior art.

[0050] Although the present invention has been described in detail above with specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A wireline cone seal structure, characterized by: The cable body includes a sealing cylinder (1), a conical sleeve (2), a sealing ring (3), a sealing cover (4), and a cable body (5). The sealing cylinder (1), the sealing ring (3), and the sealing cover (4) are sequentially fitted onto the cable body (5). One end of the sealing ring (3) abuts against the end of the sealing cylinder (1). The conical sleeve (2) is a conical collar and a compressible elastic component. The conical sleeve (2) is positioned between the inner cavity of the sealing cover (4) and the sealing ring (3). The sealing cover (4) is axially movable and sealed to the sealing cylinder (1), so that the inner cavity of the sealing cover (4) applies circumferential and radial compressive forces to the conical sleeve (2) when it moves. The sealing ring (3) compresses and seals the sheath surface of the cable body (5) and the end of the sealing cylinder (1) in the circumferential and radial directions respectively through the compressive force of the conical sleeve (2). The conical sleeve (2) is a conical collar structure with spaced grooves; The spacer groove includes a plurality of longitudinally extending slots provided on the conical sleeve (2); The plurality of longitudinally extending slots include a first longitudinal slot and a second longitudinal slot that are opened from both ends of the conical sleeve (2) toward the middle of the conical sleeve and are evenly spaced.

2. The dragline cone seal structure of claim 1, wherein: The inner surface of the sealing ring (3) has N circumferential convex ribs, where N is greater than or equal to 1. The outer diameter of the sealing ring (3) matches the inner diameter of the tapered sleeve (2), and the two can be fastened together to form a compression sealing component.

3. The dragline cone seal structure of claim 1, wherein: The inner cavity of the sealing cover (4) is a conical structure, and the taper of the conical sleeve (2) is greater than or equal to the taper of the inner cavity of the sealing cover (4).

4. The dragline cone seal structure of claim 1, wherein: The taper angle of the tapered sleeve (2) is between 0.5° and 45°.

5. The dragline cone seal structure of claim 1, wherein: The outer circular surface of the sealing cylinder (1) and the inner circular surface of the sealing cover (4) are respectively provided with external connecting threads and internal connecting threads, and the sealing cylinder (1) and the sealing cover (4) are connected by threads.

6. The dragline cone seal structure of claim 1, wherein: Flanges are provided at the bottom of the sealing cover (4) and the outer circle of the sealing cylinder (1), and the two flanges are connected by screws.

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