CN115296250A - An oil-filled cable terminal blocking structure and installation method thereof - Google Patents

Abstract

An oil-filled cable terminal plugging structure and an installation method thereof relate to the technical field of cable plugging. The oil guide pipe comprises an outer sleeve, wherein the outer sleeve is of a hollow structure with an open side and a closed side, an inner conical part is embedded in the outer sleeve and is of a hollow structure with an open side and a closed side, an inner plug is arranged in the inner conical part, a central area of the side face of one side of the inner plug extends outwards to form a conical plug, and the conical plug is matched and corresponds to the oil guide pipe. The invention realizes the minimization of the damage of the submarine oil-filled cable, the minimization of seawater pollution and economic loss, and the maximization of the safety of the submarine cable.

Description

Oil-filled cable terminal sealing structure and installation method thereof

technical field

The invention relates to the technical field of cable sealing, in particular to an oil-filled cable terminal sealing structure and an installation method thereof.

Background technique

There is a set of oil pumping stations at both ends of the submarine oil-filled cable. The two pumping stations have exactly the same system configuration. It provides guarantee for the oil supply of the submarine cable under normal and abnormal conditions. At the same time, it can be used to monitor the oil flow of the oil-filled cable in real time. Oil pressure, side to grasp the operating status of the submarine cable. In order to ensure the stable operation of the submarine oil-filled cable, when the submarine oil-filled cable is damaged and leaks oil, it is necessary to use a sealing structure to prevent the leakage of insulating oil in the oil-filled pipe of the submarine cable and the infiltration of seawater. On the seabed, the force of seawater will affect the sealing structure, and the sealing mechanism in the prior art is likely to be loose in this environment, which will affect the sealing effect, and may also cause damage to the sealing structure.

Contents of the invention

The purpose of the present invention is to solve the shortcomings in the prior art, and propose an oil-filled cable terminal sealing structure and its installation method.

In order to achieve the above purpose, the technical solution adopted in the present invention is: an oil-filled cable terminal sealing structure, the oil-filled cable is provided with an oil guide pipe in the center, and the outermost layer of the oil-filled cable is provided with a coating layer, and the sealing The plugging structure includes an inner plug, an inner cone, and an outer casing that are set sequentially from the inside to the outside. The inner cone is provided with an inner plug, and the central area of one side of the inner plug extends outward to form a cone. Plug, the cone plug matches the inner diameter of the oil guide pipe, the inner cone is a hollow structure with one side open and the other side closed, and the outer sleeve is a hollow structure with one side open and the other side closed .

Further, the inner cone includes a truncated conical part and a cylindrical part connected in sequence, the truncated conical part is embedded in the outer casing, one side of the cylindrical part extends into the outer casing and is connected with the truncated conical part, and the cylindrical part The other side extends to the outside of the outer sleeve.

Further, the outer sleeve is provided with an accommodating cavity inside, and the accommodating cavity matches the shape and size of the inner cone inside the outer sleeve.

Further, the outer side of the cylindrical part is covered with a clamping outer tube, and the nozzle of the clamping outer tube away from the outer tube side protrudes toward the central axis of the clamping outer tube to form a bayonet, and the bayonet The inner diameter is the same as that of the cylindrical part, and the thickness of the bayonet is the same as the thickness of the side wall of the cylindrical part.

Further, a second sealing ring passes between the inner wall of the bayonet socket and the port of the cylindrical component.

Further, a first sealing ring is provided between the contact surface of the internal plug and the cable, and a first elastic gasket is provided between the other side of the internal plug and the inner wall of the closed side of the truncated cone component.

Further, a second elastic gasket is provided between the outer wall on the closed side of the truncated cone part and the inner wall on the closed side of the outer sleeve.

Further, the blocking structure includes a hollow sampling pipe, one side of which passes through the outer casing, the inner cone and the inner plug in order to extend into the oil guide pipe.

Further, the blocking structure includes a detection device, the detection device includes a detection probe and a detection module, and the detection probe is located at the end of the vertebral body plug.

The second aspect of the present invention provides a method for installing an oil-filled cable terminal plugging structure, which is implemented based on the oil-filled cable terminal plugging structure described in the first aspect of the present invention, including the following steps:

S1. Insert the cone plug of the inner plug into the oil guide pipe of the oil-filled cable, and connect the two by welding, install the first sealing ring at the connection surface between the inner plug and the cable, and install the other side of the inner plug the first elastic gasket;

S2. Set the outer casing outside the frustum of the cone assembly of the inner cone, and place a second elastic gasket between the bottom surface of the frustum of the cone assembly and the inner bottom surface of the outer casing;

S3. A second sealing ring is set between the inner cone and the inner wall of the bayonet joint of the outer casing, and the flange plate is fixed by bolts on the outer wall of the closed side of the outer casing;

S4. The clamping outer tube is connected to the cylinder of the inner cone and the metal protective layer of the oil-filled cable, and the clamping outer tube is provided with screw holes, and the two clamping outer tubes are used to fix the inner cone and the oil-filled cable through screws.

Further, the detection information is collected through the detection probe, and the insulating oil sample in the oil-filled pipe is obtained through the sampling pipe.

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

1. The present invention realizes the plugging of the oil-filled cable guide pipe through the inner plug, but because the volume of the inner plug is small, and the insulating oil in the oil guide has a certain pressure, therefore, in order to keep the inner plug and the guide The stable connection of the oil pipe adopts the structure of the inner cone and the outer casing to fix the inner plug. The inner cone and the outer casing adopt a conical structure that cooperates with each other. When the outer casing is subjected to external force, the conical structure will make the The two parts will be more tightly connected.

2. The present invention realizes the plugging of submarine oil-filled cables. The present invention can ensure that the damage to the oil-filled cables and cables of the submarine cables is minimized in the emergency situation of damage, so as to prevent seawater from immersing, so as to avoid large-scale damage to the submarine cables, and at the same time prevent a large amount of cable oil from flowing into the sea, causing seawater pollution and economic losses. It can also reduce the penetration of seawater into the oil-paper insulation of oil-filled cables, leaving potential safety hazards and providing time for subsequent connections.

3. The present invention expands the function of the axial opening of the end seal part to form an interface for oil pressure monitoring and oil sample extraction, which can be connected with corresponding pressure instruments, monitoring terminals or sampling devices.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of an oil-filled cable terminal sealing structure according to a specific embodiment of the present invention;

Fig. 2 is the left view of Fig. 1;

Fig. 3 is the top view of Fig. 1;

Fig. 4 is the back view of Fig. 1;

Fig. 5 is a sectional view along the line A-A in Fig. 2;

In the figure: 1-oil-filled cable, 2-inner plug, 3-first sealing ring, 4-first elastic gasket, 5-inner cone, 6-second sealing ring, 7-second elastic gasket , 8-outer casing, 9-flange plate, 10-clamping outer tube, 11-oil guide tube, 12-vertebral body plug.

Detailed ways

The following description serves to disclose the present invention to enable those skilled in the art to carry out the present invention. The preferred embodiments described below are only examples, and those skilled in the art can devise other obvious variations.

An oil-filled cable 1 terminal sealing structure as shown in Figure 1-5, the oil-filled cable 1 is sequentially composed of oil guide pipe, conductor, main insulation layer, metal protection layer and outer covering layer from inside to outside, and the inside of the oil guide pipe Filled with insulating oil with a certain pressure.

In a specific embodiment, the sealing structure is a hollow structure with one side open and the other side closed, including an inner plug 2, an inner vertebra 5 and an outer casing 8, which are sequentially nested and installed from the inside to the outside, filled with oil. One end of the cable 1 protrudes from the open side of the sealing structure and then fits closely with the inner wall of the closed side of the sealing structure to realize the sealing of the oil guide pipe in the oil-filled cable 1, realize the repair of the oil-filled cable, and prevent the intrusion of seawater and Seepage of insulating oil in the oil guide pipe 11.

As shown in FIG. 5 , the central area of one side of the inner plug 2 extends outward to form a cone plug 12 , which matches and corresponds to the oil guide pipe, and the cone plug 12 is inserted into the oil guide pipe 11 achieve the blocking effect.

The inner cone 5 is a hollow structure with one side open and the other side closed, and the outer sleeve 8 is also a hollow structure with one side open and the other side closed, and the outside of the outer sleeve 8 is a cylindrical structure. During use, the specific structure of the outer sleeve 8 can be adjusted as required, for example, it can be in the shape of a square prism or a hexagonal prism.

The fixed connection between the inner plug 2 and the oil-filled cable 1 is realized through the inner cone 5 and the outer sleeve 8. In order to further enhance the stability between the inner cone 5 and the outer sleeve 8, the inner cone 5 It includes a truncated cone part and a cylindrical part. The truncated cone part is embedded in the outer sleeve 8, one side of the cylindrical part extends into the outer sleeve and connects with the truncated cone part, and the other side of the cylindrical part extends to the outside of the outer sleeve 8. , the truncated cone part and the cylindrical part can be an integral structure, or a detachable Huff structure; the inner plug 2 is located in the truncated cone part, and the inner plug is covered by the truncated cone part 2 Prevent the inner plug 2 from detaching from the oil-filled cable, and, in order to completely seal the oil-filled cable 1, the inner plug 2 must be larger than the outer diameter of the oil-filled cable, and the oil-filled cable 1 and the inner plug can be received through the frustum of the cone. The outer diameter of the plug 2 is different, and the edge of the inner plug is embedded in the inner wall of the frustum of the cone to realize the fixed connection between the inner plug 2 and the oil-filled cable 1 . The truncated cone part can be fixedly engaged with the inner wall of the outer casing 8, further improving the overall stability of the sealing structure.

Since the connection between the frustum of cone and the cylinder is the transition point of the two shapes, the structural stability is relatively poor. Therefore, the frustum of cone and part of the cylinder are located in the outer casing 8, so that the structure of the inner vertebra 5 The weak points are all located within the protection range of the outer sleeve, which enhances the overall impact resistance of the sealing structure.

Correspondingly, the outer sleeve 8 is provided with a housing cavity inside, and the housing cavity is matched with the size and structure of the truncated cone part and part of the cylindrical part located inside the titanium casing 8, and the inner cone is formed through the housing cavity. The body 5 is stably embedded in the outer casing 8 and will not come out, and the oil-filled cable 1 is clamped by the cylindrical part, and the central axis of the oil guide pipe coincides with the central axis of the cone plug of the inner plug 2 or Keep it within an appropriate angle range to prevent insulating oil from leaking.

The outer wall of the closed side of the outer sleeve 8 is provided with a flange plate 9, and the flange plate 9 is fixed on the outer sleeve by screws. On the one hand, the strength of the outer sleeve 8 is enhanced; During construction, it can be directly installed on the flange plate 9, thereby ensuring the stability and integrity of the sealing structure.

In order to further maintain the positional stability of the oil-filled cable 1 along the direction of the cable central axis, the outer side of the cylindrical part is covered with a clamping outer tube 10, and the clamping outer tube 10 is away from the mouth of the outer sleeve 8 to the clamping direction. The central axis of the tight outer tube 10 protrudes to form a bayonet. The inner diameter of the bayonet is the same as the inner diameter of the cylindrical part. The bayonet can not only further realize the clamping of the oil-filled cable 1, but also through the bayonet. The relative positions of the inner cone 5 and the outer sleeve 8 remain fixed.

In order to further ensure the sealing performance and shock absorption performance, a second sealing ring 6 is provided between the inner wall of the bayonet and the port of the cylindrical part, and a first sealing ring is provided between the contact surface of the inner plug 2 and the cable 3. A first elastic gasket 4 is provided between the inner plug 2 and the bottom surface of the truncated cone part. A second elastic gasket 7 is provided between the truncated cone and the outer casing 8 .

On the one hand, for the convenience of installation and disassembly, and on the other hand, for the convenience of processing, the inner cone 5, the outer sleeve 8 and the clamping outer tube 10 are all of Huff structure, which simplifies the sealing process of the submarine cable.

The sealing effect of oil-filled cables is mainly reflected in whether there is seepage of internal insulating oil and external seawater. Usually, the working position of oil-filled cables is located on the seabed, and it will be difficult to detect a small amount of insulating oil seepage. To solve this problem, a hollow sampling tube is set in the plugging structure, and one side of the sampling tube passes through the outer casing, the inner cone and the inner plug to extend into the oil guide pipe, and passes through the outer casing, the inner cone Axial opening of parts and internal plugs and adding sampling tubes can timely sample the insulating oil in the oil guide pipe at the plugging structure, and judge whether the current plugging effect meets the requirements according to the sampling results in time. If the plugging requirements are not met , make timely adjustments.

Since the plugging structure is a remedial measure for oil-filled cables, it is necessary to detect relevant parameters of the plugging position, such as the pressure of insulating oil, etc. For this reason, the plugging structure is provided with a detection device, and the detection device includes a detection probe (existing sensing detection devices such as pressure sensors) and a detection module, the detection probe is located at the end of the vertebral body plug, the detection module can use the existing signal receiving chip to upload the detection data to the remote monitoring terminal, and the remote monitoring terminal Analyze the detected data.

In a specific embodiment, a method for installing an oil-filled cable 1 terminal sealing structure is implemented based on the above oil-filled cable 1 terminal sealing structure, including the following steps:

S1. Insert the cone plug of the inner plug 2 into the oil guide pipe of the oil-filled cable 1, and connect the two by welding. Install the first sealing ring 3 at the connection surface between the inner plug 2 and the cable, and the inner plug 2 Install the first elastic gasket 4 on the other side;

S2. Set the outer sleeve 8 outside the truncated cone assembly of the inner cone 5, and place the second elastic gasket 7 between the bottom surface of the truncated cone assembly and the inner bottom surface of the outer sleeve 8;

S3. A second sealing ring 6 is set between the inner cone 5 and the inner wall of the bayonet of the outer sleeve 8, and the flange plate 9 is fixed by bolts on the closed side of the outer sleeve 8;

S4. The clamping outer tube 10 is connected to the cylinder of the inner cone 5 and the metal protection layer of the oil-filled cable 1, and the clamping outer tube 10 is provided with screw holes, and the two clamping outer tubes 10 are used to fix the inner cone by screws 5 and oil-filled cable 1.

S5. Collect detection information through the detection probe, and obtain a sample of insulating oil in the oil-filled pipe through the sampling pipe.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description are only the principles of the present invention. Variations and improvements, which fall within the scope of the claimed invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims (10)

1. An oil-filled cable terminal plugging structure, the oil-filled cable is provided with an oil guide pipe in the center, and the outermost layer of the oil-filled cable is provided with an outer layer, it is characterized in that the plugging structure includes sequentially from inside to outside The inner plug, the inner vertebral piece and the outer casing are sleeved. The inner cone is provided with an inner plug. The central area of one side of the inner plug extends outward to form a cone plug. The cone plug Corresponding to the matching of the inner diameter of the oil guide pipe, the inner cone is a hollow structure with one side open and the other side closed, and the outer sleeve is a hollow structure with one side open and the other side closed. 2. An oil-filled cable terminal sealing structure according to claim 1, characterized in that the inner cone includes a truncated conical part and a cylindrical part connected in sequence, and the truncated conical part is embedded in the outer casing, One side of the cylindrical part extends into the outer casing and is connected with the frustum of cone part, and the other side of the cylindrical part extends to the outside of the outer casing. 3. An oil-filled cable terminal sealing structure according to claim 2, characterized in that, the outer side of the cylindrical part is covered with a clamping outer tube, and the clamping outer tube is far away from the nozzle on the side of the outer sleeve A bayonet socket is formed protruding toward the central axis of the clamping outer tube, the inner diameter of the bayonet socket is the same as the inner diameter of the cylindrical part, and the thickness of the bayonet socket is the same as the thickness of the side wall of the cylindrical part. 4 . The oil-filled cable terminal sealing structure according to claim 3 , wherein a second sealing ring is passed between the inner wall of the bayonet socket and the port of the cylindrical member. 5. An oil-filled cable terminal sealing structure according to claim 2, characterized in that a first sealing ring is provided between the contact surface of the inner plug and the cable, and the other side of the inner plug is in contact with the contact surface of the cable. A first elastic gasket is provided between the inner wall of the closed side of the truncated cone part. 6 . The oil-filled cable terminal sealing structure according to claim 2 , wherein a second elastic gasket is provided between the outer wall on the closed side of the truncated cone member and the inner wall on the closed side of the outer casing. 7 . 7. An oil-filled cable terminal sealing structure according to claim 1, characterized in that, the sealing structure comprises a hollow sampling tube, and one side of the sampling tube passes through the outer sleeve, the inner cone and the inner plug in sequence The head extends into the oil guide tube. 8. An oil-filled cable terminal plugging structure according to claim 1, characterized in that the plugging structure includes a detection device, the detection device includes a detection probe and a detection module, and the detection probe is located at the end of the vertebral body plug department. 9. A method for installing a plugging structure of an oil-filled cable terminal, characterized in that it is realized based on the plugging structure of an oil-filled cable terminal according to any one of claims 1-8, comprising the following steps: S1. Insert the cone plug of the inner plug into the oil guide pipe of the oil-filled cable, and connect the two by welding, install the first sealing ring at the connection surface between the inner plug and the cable, and install the other side of the inner plug the first elastic gasket; S2. Set the outer casing outside the frustum of the cone assembly of the inner cone, and place a second elastic gasket between the bottom surface of the frustum of the cone assembly and the inner bottom surface of the outer casing; S3. A second sealing ring is set between the inner cone and the inner wall of the bayonet joint of the outer casing, and the flange plate is fixed by bolts on the outer wall of the closed side of the outer casing; S4. The clamping outer tube is connected to the cylinder of the inner cone and the metal protective layer of the oil-filled cable, and the clamping outer tube is provided with screw holes, and the two clamping outer tubes are used to fix the inner cone and the oil-filled cable through screws. 10 . The method for installing an oil-filled cable terminal plugging structure according to claim 9 , wherein detection information is collected through a detection probe, and a sample of insulating oil in the oil-filled pipe is obtained through a sampling pipe. 11 .

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