CN112615341B - A power cable sealing device - Google Patents

Abstract

The invention discloses a power cable sealing device, which relates to the technical field of power fittings and comprises two packaging shells, wherein the two packaging shells are fixedly connected through a plurality of connecting bolts, an inflation valve port is fixedly installed on one packaging shell, the inflation valve port is connected with two air guide pipes, the air guide pipes are connected with sealing sleeves, and the sealing sleeves are embedded in embedded steel rings. When the valve port of aerifing is opened, the inside negative pressure state of gomphosis steel pipe and inflation facing is relieved, thereby make the inflation facing to the pressure reduction of gasbag, lead to the connecting seat to push down at the resilience force effect of side bow-shaped pole and interior arc rod, be in the stress balance state until side bow-shaped pole and interior arc rod, this design has been avoided sealed glue and has been carried out the operation of shutoff to the clearance, the sealed effect condition different because of using the technology difference to appear has been avoided, convenience and suitability have been improved.

Description

A power cable sealing device

technical field

The invention relates to a sealing device, relates to the technical field of electric power accessories, in particular to a sealing device for power cables.

Background technique

Power cables are cables used to transmit and distribute electric energy. Power cables are often used in urban underground power grids, outgoing lines of power stations, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas.

In the prior art, during the laying of the power cable, a cable connector is required to connect the cables of the two segments, but most of the existing connectors have relatively poor sealing performance, and are not suitable for laying underground, water, etc. It needs to be sealed when it is in an inferior humid and corrosive environment. Most of the existing sealing methods are disposable, and they need to be removed and resealed during maintenance, and the sealing effect is very easily limited by the sealant coating technology. inconvenient.

Contents of the invention

The technical problem to be solved by the present invention is to provide a power cable sealing device, one of the purposes of which is to have a reusable sealing structure and solve the problem of repeated packaging during maintenance.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A sealing device for a power cable, comprising an encapsulation shell, the number of the encapsulation shells is two, the two encapsulation shells are fixedly connected by a plurality of connecting bolts, and one of the encapsulation shells is fixedly installed with an inflation valve port , the inflation valve port is connected with two air guide tubes, the air guide tube is connected with a sealing sleeve, the sealing sleeve is embedded in the embedded steel ring, and the embedded steel ring is sealingly embedded in the two packaging shells between.

The further improvement of the technical solution of the present invention is that: the sealing sleeve includes a fitted steel pipe, the inner side of the fitted steel pipe is sealed and connected with an expansion cladding, and the cavity formed by the fitted steel pipe and the expansion cladding is filled with negative pressure air, so A pressurized assembly is provided between the inner wall of the expansion cladding and the inner wall of the fitted steel pipe, and a trachea port is provided on the side of the fitted steel pipe, and the trachea port is sealed and connected with the air guide tube.

The further improvement of the technical solution of the present invention is that: the pressurization assembly includes a seat frame, the outer surface of the seat frame is fixedly connected with the inner wall of the embedded steel pipe, and the two sides of the seat frame are buckled with multiple A side bow-shaped rod, the side bow-shaped rod is far away from the connecting seat, an air bag is fixed on the lower side of the connecting seat, the inside of the air bag is high-pressure air, and the inner middle section of the side bow-shaped rod is An inner drawing arc rod is fastened, and the other end of the inner drawing arc rod is fixedly welded on the inner side wall of the seat frame.

The further improvement of the technical solution of the present invention is: the cross section of the seat frame is C-shaped, and the seat frame is in the shape of an arc rail, the connecting seat is an arc rail, and the center of the seat frame and the connecting seat The centers of the circles coincide with each other.

The further improvement of the technical solution of the present invention is that: the number of the inner arc rod is the same as that of the side arch rod, and the inner arc rod is an arc spring rod, and its elasticity tends to be straightened, and the side arch rod It is a bow-shaped elastic rod, and its elasticity tends to be straightened.

Owing to adopting above-mentioned technical scheme, relative to the prior art, the technical progress of the present invention is:

1. The present invention provides a power cable sealing device. When the inflation valve port is opened, the internal negative pressure state between the fitted steel pipe and the expansion cladding is released, so that the pressure of the expansion cladding on the air bag is reduced, causing the connecting seat to be bowed on the side. Press down with the rebound force of the inner arc rod until the side arch rod and the inner arc rod are in a force-balanced state. At this time, the internal pressure of the embedded steel pipe and the expansion cladding is the same as the outside world, and the pressure of the airbag is greater than atmospheric pressure , so that the pressure applied to the airbag by the connecting seat is evenly distributed on the surface of the airbag under the action of aerodynamic characteristics, that is, the pressure of each point on the contact surface between the airbag and the expansion cladding is the same, and then the pressure of each point on the contact surface between the expansion cladding and the cable is the same, Reduces the probability of infiltration due to different pressures. This design eliminates the need for sealant to seal the gap, avoids the situation of different sealing effects due to differences in use processes, and improves convenience and applicability. sex.

2. The present invention provides a power cable sealing device, the arc springback design of the side arch rod and the inner arc rod and the design of the quantity, etc., so that the side arch rod and the inner arc rod will be separated during the rebound process. Push the connection seat to generate a displacement relative to the seat frame, so that the connection seat can press the expansion cover through the air bag in the process, and the pre-negative pressure makes the expansion cover press the pressurized component. The design is used to expand the sealing sleeve The overall inner diameter makes it easier for cables to pass through. When maintenance is required, it is only necessary to re-absorb the inside of the embedded steel pipe and the expansion cladding into a negative pressure state through the inflation valve. This process does not require re-adding sealant, reducing The cost of maintenance also improves the environmental protection.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the side sectional structure schematic diagram of the present invention;

Fig. 3 is a cross-sectional view of the sealing sleeve of the present invention;

Fig. 4 is a side sectional view of the sealing sleeve of the present invention;

Fig. 5 is a structural schematic diagram of the booster assembly of the present invention.

In the figure: 1. Encapsulation shell; 2. Connecting bolt; 3. Inflatable valve port; 4. Air guide tube; 5. Embedded steel ring; 6. Sealing sleeve;

61. Fitted steel pipe; 62. Expansion cladding; 63. Supercharging component; 64. Tracheal port;

631, seat frame; 632, side bow bar; 633, connecting seat; 634, air bag; 635, inner drawing arc bar.

Detailed ways

Below in conjunction with embodiment the present invention is described in further detail:

Example 1

As shown in Figures 1-2, the present invention provides a power cable sealing device, including a packaging case 1, which is characterized in that: the number of packaging cases 1 is two, and a plurality of connecting bolts 2 are passed between the two packaging cases 1 Fixed connection, which is designed to wrap the cable connector inside, block the external water or soil, and provide protection for the connector and the cable. One of the packaging shells 1 is fixedly installed with the inflation valve port 3, and the inflation valve port 3 Two air guide tubes 4 are connected, the air guide tube 4 is connected with a sealing sleeve 6, the sealing sleeve 6 is embedded in the embedded steel ring 5, and the embedded steel ring 5 is sealed and embedded between the two packaging shells 1, the design It is used to use the sealing sleeve 6 to fill the gap between the cable and the embedded steel ring 5, and to communicate the sealing sleeve 6 with the outside air through the inflation valve port 3 and the air guide tube 4 for control.

Example 2

As shown in Figures 2-4, on the basis of Example 2, the present invention provides a technical solution: the sealing sleeve 6 includes a fitting steel pipe 61, and the inner side of the fitting steel pipe 61 is sealed and connected with an expansion cladding 62, and the fitting steel pipe 61 The interior of the cavity formed with the expansion cladding 62 is negative pressure air. This design uses the expansion cladding 62 to make the volume between the fitted steel pipe 61 and the expansion cladding 62 change with the change of the internal air pressure, which plays a role in controlling the expansion. A booster component 63 is provided between the inner wall of the cladding 62 and the inner wall of the embedded steel pipe 61, which is designed to apply support force to the expanded cladding 62 so that it can fit on the cable and fit on the side of the steel pipe 61. A trachea port 64 is provided, and the trachea port 64 is sealed and connected with the air guide tube 4. This design is used to connect the inside of the fitted steel pipe 61 and the expansion cladding 62 to the outside world through the trachea port 64, the air guide tube 4 and the inflation valve port 3. The air is connected to facilitate the adjustment of the internal air pressure of the fitted steel pipe 61 and the expansion cladding 62 .

Example 3

As shown in Figures 3-5, on the basis of Embodiment 1 and Embodiment 2, the present invention provides a technical solution: the pressurization assembly 63 includes a seat frame 631, and the outer surface of the seat frame 631 is fitted with the inner wall of the steel pipe 61 There are fixed connections between them, and a plurality of side arched rods 632 are buckled on both sides of the seat frame 631, and the side arched rods 632 are away from the connecting seat 633. The cross section of the seat frame 631 is C-shaped, and the seat frame 631 is The arc rail shape, the connecting seat 633 is an arc rail, the center of the circle of the seat frame 631 and the center of the connecting seat 633 coincide with each other, and the side bow bar 632 is a bow-shaped spring bar, and its elasticity tends to a straight state. The side arched rod 632 exerts a force tending to move away from the seat frame 631 and the connecting seat 633, so that the expansion cover 62 is lowered and when the pressure is applied to the connecting seat 633 by the air bag 634, the two can be inflated under the action of the side arched rod 632. The cladding 62 exerts thrust so that it can be tightly pressed against the surface of the cable to achieve a good sealing effect. An air bag 634 is fixed on the lower side of the connection seat 633, and the inside of the air bag 634 is high-pressure air. This design is used to connect The thrust received by the seat 633 is evenly transmitted to the expansion cladding 62, wherein the characteristics of the same pressure at each point in the same space in aerodynamics are utilized, so that the thrust of the connecting seat 633 is more evenly distributed on the expansion cladding 62, avoiding force Different situations occur, the inner middle section of the side arched rod 632 is fastened with an inner draw arc rod 635, and the other end of the inner draw arc rod 635 is fixedly welded on the inner side wall of the seat frame 631, and the inner draw arc rod 635 is connected to the side The number of side arched rods 632 is the same, and the inner pull arc rod 635 is an arc-shaped elastic rod, and its elasticity tends to be straightened. This design is used to apply a pulling force in the rebound direction to the side arched rods 632. The rebound strength of the side bow rod 632 makes the side bow rod 632 exert greater pressure on the connecting seat 633, so that the expansion cover 62 can further fit the surface of the cable. The rod-shaped design makes it possible to Auxiliary pushing effect is performed on the side arched rod 632 , which makes the rebound of the side arched rod 632 easier, and further increases the bonding effect between the expansion cladding 62 and the surface of the cable.

Let's talk about the working principle of the power cable sealing device in detail.

As shown in Figure 1-5, first pass the two ends of the cable through the two sealing sleeves 6 respectively, then use the cable connector to connect the cables together, and then use the connecting bolt 2 to fix the package shell 1, Finally, open the inflation valve port 3 to allow outside air to enter the sealing sleeve 6, and then close the inflation valve port 3 after filling in an appropriate amount of air. The internal negative pressure state of the cladding surface 62 is released, thereby reducing the pressure of the inflatable cladding surface 62 on the airbag 634, causing the connecting seat 633 to be pressed down under the rebound force of the side arched rod 632 and the inner arc rod 635 until the side arched rod 632 and the inner drawing arc rod 635 are in a force-balanced state. At this time, the internal pressure of the fitted steel pipe 61 and the expansion cladding 62 is the same as that of the outside world, and the pressure of the air bag 634 is greater than atmospheric pressure, so that the pressure applied to the air bag 634 by the connecting seat 633 is equal to that of the air. Under the action of dynamic characteristics, it is evenly dispersed on the surface of the airbag 634, that is, the pressure at each point of the contact surface between the airbag 634 and the expansion covering 62 is the same, so that the pressure at each point of the contact surface between the expansion covering 62 and the cable is the same, reducing the pressure caused by different pressures. the probability of infiltration;

The arc springback design of the side bow bar 632 and the inner draw arc bar 635 and the design of equal numbers make the side bow bar 632 and the inner draw arc bar 635 push the connecting seat 633 during the rebound process, resulting in a relative Due to the displacement of the seat frame 631, the connecting seat 633 can press the expansion cover 62 through the air bag 634 during this process, and the pre-negative pressure makes the expansion cover 62 press the pressurization component 63. The design is used to expand the sealing sleeve 6 The overall inner diameter makes it easier for cables to pass through. When maintenance is required, it is only necessary to re-absorb the inside of the embedded steel pipe 61 and the expansion cladding 62 into a negative pressure state through the inflation valve port 3. This process does not require re-adding sealant , reducing maintenance costs and improving environmental protection.

The above has generally described the present invention in detail, but some modifications or improvements can be made on the basis of the present invention, which are obvious to those skilled in the art. Therefore, modifications or improvements without departing from the spirit of the present invention are within the protection scope of the present invention.

Claims (2)

1. A sealing device for a power cable, comprising an encapsulation shell (1), characterized in that: the quantity of the encapsulation shells (1) is two, and a plurality of connection bolts ( 2) Fixed connection, one of the packaging shells (1) is fixedly equipped with an inflation valve port (3), and the inflation valve port (3) is connected with two air guide tubes (4), and the air guide tube (4) A sealing sleeve (6) is connected, the sealing sleeve (6) is embedded in the embedded steel ring (5), and the embedded steel ring (5) is hermetically embedded between the two packaging shells (1) ; The sealing sleeve (6) includes a fitting steel pipe (61), and the inner side of the fitting steel pipe (61) is sealed and connected with an expansion cladding (62), and the fitting steel pipe (61) and the expansion cladding (62) are composed of The inside of the cavity is negative pressure air, and a pressurization assembly (63) is provided between the inner wall of the expansion cladding (62) and the inner wall of the embedded steel pipe (61), and the side of the embedded steel pipe (61) is provided with A trachea port (64), which is sealed and connected between the trachea port (64) and the air guide tube (4); The pressurization assembly (63) includes a seat frame (631), the outer surface of the seat frame (631) is fixedly connected with the inner wall of the embedded steel pipe (61), and the two sides of the seat frame (631) A plurality of side bow-shaped rods (632) are buckled on the top, and the side bow-shaped rods (632) are away from the connecting seat (633), and an air bag (634) is fixed on the lower side of the connecting seat (633), The inside of the airbag (634) is high-pressure air, and the inner middle segment of the side arched rod (632) is buckled with an inner draw arc rod (635), and the other end of the inner draw arc rod (635) Fixedly welded on the inner wall of the seat frame (631); The number of the inner arc rods (635) is the same as that of the side arched rods (632), and the inner arc rods (635) are arc-shaped elastic rods whose elasticity tends to be straightened, and the side arched rods (632) is bow-shaped bullet rod, and its elasticity tends to straightening state. 2. A power cable sealing device according to claim 1, characterized in that: the cross section of the mount (631) is C-shaped, and the mount (631) is in the shape of an arc rail, the The connecting seat (633) is an arc rail, and the center of circle of the seat frame (631) and the center of circle of the connecting seat (633) coincide with each other.

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