Fireproof and explosion-proof cable intermediate joint and use method thereof

Abstract

The invention relates to a fireproof and explosion-proof cable intermediate joint and a using method thereof.The fireproof and explosion-proof cable intermediate joint comprises a joint shell and a fastening mechanism, the joint shell comprises an upper shell and a lower shell, the upper shell and the lower shell are detachably connected, a heat shrink tube is arranged in the joint shell, and a sealing piece is arranged on the joint shell in the shrinkage direction of the heat shrink tube in a sliding mode; one end of the sealing piece penetrates through the connector shell and extends into the connector shell, the end, extending into the connector shell, of the sealing piece is fixedly connected with the outer wall of the heat shrink tube, and the fastening mechanisms are located at the two axial ends of the connector shell. One part of the fastening mechanism is connected to one end, far away from the connector shell, of the sealing part, the other part of the fastening mechanism is fixedly connected to the outer wall of the cable, and the two ends of the connector shell are fixed to the outer wall of the cable respectively, so that maintenance personnel can maintain the cable in time, and meanwhile, the possibility that the cable is broken is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of cable joints, and in particular to a fireproof and explosion-proof cable intermediate joint and a method for using the same. Background Art

[0002] Cable is a wire product used to transmit electrical energy, signals or realize electromagnetic energy conversion. It is usually composed of one or more mutually insulated conductors, outer insulation and protective layer.

[0003] When connecting multiple cables, the conductors inside the cables are usually connected first, and then a connector is put on the connection. The two ends of the connector are fixed to the protective layer outside the cable, and multiple layers of insulation material are provided inside the connector to prevent the cable from catching fire and exploding.

[0004] In view of the above-mentioned prior art, the inventor believes that when the temperature inside the cable is too high, despite the insulation material and the fixation of the intermediate joint, it also causes the maintenance personnel to be unable to detect the problem with the cable in the first time, which makes it difficult to repair the cable in time and causes fire and explosion at the cable connection. Summary of the invention

[0005] In order to enable the staff to carry out timely repairs when the cable temperature is too high, the present application provides a fireproof and explosion-proof cable intermediate joint.

[0006] In a first aspect, the present application provides a fireproof and explosion-proof cable intermediate joint that adopts the following technical solution.

[0007] A fireproof and explosion-proof cable intermediate joint, comprising a joint shell and a fastening mechanism, the joint shell comprising an upper shell and a lower shell, the upper shell and the lower shell are detachably connected, a heat shrink tube is arranged inside the joint shell, and a closing piece is arranged on the joint shell for sliding along the shrinking direction of the heat shrink tube, one end of the closing piece passes through the joint shell and extends into the joint shell, the end of the closing piece extending into the joint shell is fixedly connected to the outer wall of the heat shrink tube, the fastening mechanism is located at both ends of the joint shell in the axial direction, a part of the fastening mechanism is connected to an end of the closing piece away from the joint shell, and another part of the fastening mechanism is fixedly connected to the outer wall of the cable, and the two ends of the joint shell are respectively fixed to the outer wall of the cable.

[0008] Optionally, the heat shrink tube has several sections, the cross-sectional areas of the several sections of the heat shrink tube increase successively along the axial direction, the several sections of the heat shrink tube are integrally formed, and there are several closing pieces, one ends of the several closing pieces are respectively fixedly connected to the outer walls of the heat shrink tubes with different cross-sectional areas.

[0009] Optionally, the lengths of the ends of a plurality of the closing members away from the heat shrink tube extending out of the connector housing are the same.

[0010] Optionally, the inner wall of the connector shell is stepped, and the outer wall of the heat shrink tube matches the inner wall of the connector shell.

[0011] Optionally, the joint shell is provided with a groove, and one end of the closure member facing the joint shell can be slidably embedded in the groove.

[0012] Optionally, a semi-annular heat dissipation port is provided at one end of the joint shell in the axial direction close to the pipe opening with the largest cross-section of the heat shrink tube.

[0013] Optionally, the end of the heat shrink tube with the largest cross-section has the same area as the heat dissipation port, and the largest end of the heat shrink tube can block the heat dissipation port after shrinking.

[0014] Optionally, the fastening mechanism includes a fastening ring, a slider and a connecting rod, the fastening ring is fixedly sleeved on the outer wall of the cable, the outer wall of the fastening ring is provided with a sliding groove along the axial direction, the slider is connected in the sliding groove by axial sliding along the fastening ring, one end of the connecting rod is rotatably connected to the slider, the end of the connecting rod originally away from the slider is respectively rotatably connected to the closing parts located at the head and tail of the connector shell, and the connecting rod is rotatably connected to one end of the closing part away from the heat shrink tube.

[0015] Optionally, an arc-shaped plate matching the outer wall of the heat shrink tube is fixedly connected to one end of the closure member close to the heat shrink tube, and the inner side of the arc-shaped plate is fixedly connected to the outer wall of the heat shrink tube.

[0016] Optionally, an outer wall of the closure is provided with an inclined placement groove, the interior of the placement groove is filled with powdered flame retardant, and the closure can slide to open the placement groove.

[0017] In a second aspect, the present application provides a method for using the above-mentioned cable intermediate joint, which adopts the following technical solution: S1: Put the heat shrink tube on the connection of the inner conductor of the cable; S2: buckle and fix the upper shell and the lower shell; S3: Seal the connection between the connector housing and the inner conductor of the cable.

[0018] In summary, the present application includes at least one of the following beneficial effects: By using multiple sections of heat shrink tubing with different cross-sectional areas, the distances between the heat shrink tubing and the internal conductor of the cable are made different, so that the time when the heat shrink tubing is exposed to heat shrinkage is different. The heat shrink tubing with a smaller cross-sectional area is closer to the cable conductor and starts to shrink first, driving the closure to start sliding and shrinking. The higher the temperature, the more the closures arranged along the axial direction shrink. Maintenance personnel can easily determine the degree of damage to the cable joint by observing the shrinkage of the external closure, thereby facilitating timely maintenance by maintenance personnel.

[0019] After the heat shrink tube shrinks and attaches to the cable connection, it blocks the air to a certain extent, reducing the probability of fire.

[0020] The double fixation of the fastening mechanism and the connector housing can reduce the probability of explosive disconnection of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 It is a half-section view of the overall structure of this embodiment; Explanation of the reference numerals: 1. Connector housing; 101. Upper housing; 102. Lower housing; 2. Heat shrink tube; 3. Closure; 4. Groove; 5. Heat dissipation port; 6. Fastening mechanism; 601. Fastening ring; 602. Slider; 603. Connecting rod; 7. Arc plate; 8. Placement groove. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-2 The present application is further described with specific embodiments: First of all, it should be noted that in the description of this application, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and other directional words appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of this application; in addition, if the terms "first", "second", "third" and other numerical quantifiers appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", and "connected" appear, they should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, a limited connection such as an interference fit, a transition fit, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium; therefore, for ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0023] The embodiment of the present application discloses a fireproof and explosion-proof cable intermediate joint and a method of using the same.

[0024] A fireproof and explosion-proof cable intermediate joint, referring to Figure 1 and Figure 2 , including a joint shell 1, a heat shrink tube 2 is arranged inside the joint shell 1, a through hole is opened in the joint shell, and a closing piece 3 is arranged on the joint shell 1 to slide along the shrinking direction of the heat shrink tube 2 through the through hole. One end of the closing piece 3 passes through the joint shell 1 and extends into the joint shell 1. The end of the closing piece 3 extending into the joint shell 1 is fixedly connected to the outer wall of the heat shrink tube 2. The shrinkage temperature of the heat shrink tube 2 is the temperature when the cable needs to be repaired. When the conductor inside the cable heats up, the heat shrink tube 2 begins to shrink, driving the external closing piece 3 to slide and shrink together. The contraction of the closing piece 3 is convenient for reminding the maintenance personnel that the temperature is too high, so that timely maintenance can be carried out.

[0025] Reference Figure 1 and Figure 2 The heat shrink tube 2 has several sections, and the cross-sectional areas of several sections of the heat shrink tube 2 increase successively along the axial direction. Several sections of the heat shrink tube 2 are integrally formed. There are several closures 3, and several closures 3 are distributed axially along the connector shell 1. The closures 3 at each section of the heat shrink tube 2 are evenly distributed circumferentially along the heat shrink tube 2. One ends of several closures 3 are respectively fixedly connected to the outer walls of the heat shrink tubes 2 with different cross-sectional areas. The smaller the cross-sectional area, the closer the inner wall of the heat shrink tube 2 is to the internal conductor of the cable. The ends of several closures 3 away from the heat shrink tube 2 extend out of the connector shell 1 at the same length. When the temperature of the internal conductor of the cable exceeds the standard, the heat shrink tube 2 with the smallest cross-sectional area begins to shrink first. When the closure 3 at the heat shrink tube 2 with the largest cross-sectional area begins to shrink, it means that the cable is about to catch fire and needs to be repaired immediately. The highly uniform closures 3 shrink in sequence, which makes it convenient for maintenance personnel to identify which connection points are cable connection points that need to be repaired immediately.

[0026] Reference Figure 1 and Figure 2 The inner wall of the joint shell 1 is stepped, and the outer wall of the heat shrink tube 2 matches the inner wall of the joint shell 1. The stepped inner wall of the joint shell 1 is limited, which reduces the probability of a small area heat shrink tube 2 shrinking and causing a large area heat shrink tube 2 to shrink significantly, thereby reducing the possibility of misjudgment by maintenance personnel.

[0027] Reference Figure 1 and Figure 2The connector shell 1 is provided with a groove 4, and the closure is a two-section rod. The diameter of the first section of the closure far away from the connector shell is larger than that of the second section of the closure close to the connector shell. The end of the first section of the closure 3 facing the connector shell 1 can be slidably embedded in the groove 4. When the closure 3 is embedded in the groove 4, it means that the heat shrink tube 2 connected to it has been completely shrunk to the surface of the cable conductor, so that the staff can quickly judge whether the temperature inside the cable has reached the shrinkage temperature of the heat shrink tube 2 based on the degree of cooperation between the closure 3 and the groove 4.

[0028] Reference Figure 1 and Figure 2 The connector shell 1 includes an upper shell 101 and a lower shell 102. A semi-annular heat dissipation port 5 is provided at one end of the connector shell 1 in the axial direction close to the largest tube opening of the heat shrink tube 2. Both the upper shell 101 and the lower shell 102 are provided with a semi-annular heat dissipation port 5 to facilitate daily heat dissipation at the cable connection.

[0029] Reference Figure 1 and Figure 2 The connector shell 1 is sealed and connected to the outer wall of the cable. The end face wall thickness of the end with the largest cross-section of the heat shrink tube 2 matches the area of ​​the heat dissipation port 5. The largest end of the heat shrink tube 2 can block the heat dissipation port 5 after shrinking. When the temperature inside the cable reaches the critical point of ignition, the heat shrink tube 2 with the largest cross-sectional area finally begins to shrink to block the heat dissipation port 5, isolating the inside of the connector shell 1 from the outside air, thereby reducing the probability of continued burning after a fire occurs at the cable connection.

[0030] Reference Figure 1 and Figure 2The cable intermediate joint includes two fastening mechanisms 6, which are respectively arranged at both ends of the joint shell 1. The fastening mechanism 6 includes a fastening ring 601, a slider 602 and a connecting rod 603. The fastening ring 601 is fixedly sleeved on the outer wall of the cable. A sliding groove is axially provided on the outer wall of the fastening ring 601. The slider 602 is axially slidably connected in the sliding groove along the fastening ring 601. One end of the connecting rod 603 is rotatably connected to the slider 602. The end of the connecting rod 603 originally away from the slider 602 is rotatably connected to the closing member 3 located at the head and tail of the joint shell 1. The connecting rod 603 is rotatably connected to the end of the closing member 3 away from the heat shrink tube 2. A buffer spring is arranged between the slider 602 and the end of the sliding groove close to the joint shell 1. One end of the buffer spring is fixedly connected to the slider 602, and the other end of the buffer spring is fixedly connected to the end of the sliding groove close to the joint shell 1. The elastic force of the buffer spring can drive the slider 602 to slide away from the joint shell 1. The elastic force of the buffer spring is in the direction of the elastic force of the buffer spring, which is smaller than the pulling force applied by the heat shrink tube 2 to the closure 3. When the cable connection point explodes and forces the two sections of the cable to separate, the connector housing 1 is first subjected to the repulsive force generated when the cable is disconnected. When the connector housing 1 can no longer hold the cable, the fastening ring 601 is subjected to the pulling force of the cable to be disconnected, causing the fastening ring 601 to slide away from the connector housing 1. At this time, the slider 602 slides relatively toward the connector housing 1 and compresses the buffer spring at the same time. The elastic force of the buffer spring offsets part of the pulling force, thereby reducing the probability of direct cable disconnection. When the slider 602 squeezes the buffer spring to the limit compression state, if the fastening ring 601 continues to move away from the connector housing 1, the slider 602 drives one end of the connecting rod 603 to rotate, and the other end of the connecting rod 603 rotates to cause the closure 3 to slide and press against the heat shrink tube 2, thereby making the shrinkage force of the heat shrink tube 2 greater, further reducing the probability of cable disconnection.

[0031] Reference Figure 1 and Figure 2 One end of the closure member 3 close to the heat shrink tube 2 is fixedly connected with an arc plate 7 matching the outer wall of the heat shrink tube 2, and the inner side of the arc plate 7 is fixedly connected to the outer wall of the heat shrink tube 2, so as to increase the connection area between the closure member 3 and the heat shrink tube 2.

[0032] Reference Figure 1 and Figure 2 An inclined placement groove is provided on the outer wall of the closure 3, and the inside of the placement groove is filled with powdered flame retardant. The closure 3 can slide to open the placement groove. When the heat shrink tube 2 drives the closure 3 to slide, the closure 3 slides to open the notch of the placement groove, so that the flame retardant in the placement groove is sprinkled onto the surface of the heat shrink tube 2, reducing the probability of fire.

[0033] A method of use, using the cable intermediate joint as described above, adopts the following steps: S1: Put the heat shrink tube on the inner conductor surface of the cable through the heat shrink tube opening, and fix the two fastening rings on the outermost layer of the cable respectively; S2: Fasten the upper shell and the lower shell together so that the connector shell is placed on the surface of the inner conductor of the cable; S3: The connection between the connector housing and the cable is sealed, and ventilation inside the cable is only through the heat dissipation vents.

[0034] When the temperature inside the cable is too high, the heat shrink tube will shrink and eventually block the heat dissipation port, thereby isolating the air inside the cable from the outside as much as possible and reducing the possibility of fire.

[0035] Implementation principle: When the temperature at the cable connection is too high, the heat shrink tube 2 with the smallest cross-sectional area will first drive the closure 3 to start shrinking. At this time, the cable can continue to work. When the temperature of the cable continues to rise, the heat shrink tubes 2 will start shrinking in sequence until the heat shrink tube 2 with the largest cross-sectional area shrinks, blocking the heat dissipation port 5 to avoid internal fire. Driven by the closure 3, the flame retardant in the slot is sprinkled on the surface of the heat shrink tube 2 to further reduce the probability of internal fire. When the cable connection is disconnected due to excessive temperature, the connector shell 1 will first pull the cables at both ends. When the tension of the cable is too large, The connector housing 1 cannot continue to hold the cable, and the cable drives the fastening ring 601 to move away from the connector housing 1. At this time, the slider 602 moves relative to the fastening ring 601 to compress the buffer spring, so that the elastic force of the buffer spring offsets part of the tension generated when the cable is disconnected. When the buffer spring reaches the limit compression state, if the cable continues to drive the fastening ring 601 to move, the connecting rod 603 rotates under the drive of the slider 602, so that the closure 3 moves toward the heat shrink tube 2. The closure 3 squeezes the heat shrink tube 2 through the arc plate 7, so that the heat shrink tube 2 shrinks tighter, further reducing the probability of cable disconnection.

[0036] It should be noted that the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. Although the present application has been described in detail in this specification with reference to the above embodiments, a person of ordinary skill in the art should understand that a person of ordinary skill in the art can still modify or make equivalent substitutions to the present application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. A fireproof and explosion-proof cable intermediate joint, characterized in that: The invention comprises a connector shell (1) and a fastening mechanism, wherein the connector shell comprises an upper shell and a lower shell, wherein the upper shell and the lower shell are detachably connected, wherein a heat shrink tube (2) is provided inside the connector shell (1), wherein a closing member (3) is provided on the connector shell (1) so as to slide along the shrinking direction of the heat shrink tube (2), wherein one end of the closing member (3) passes through the connector shell (1) and extends into the connector shell (1), wherein the end of the closing member (3) extending into the connector shell (1) is fixedly connected to the outer wall of the heat shrink tube (2), wherein the fastening mechanism is located at both ends of the connector shell in the axial direction, wherein a part of the fastening mechanism is connected to an end of the closing member away from the connector shell, and another part of the fastening mechanism is fixedly connected to the outer wall of the cable, and wherein the two ends of the connector shell are respectively fixed to the outer wall of the cable.

2. The fireproof and explosion-proof cable intermediate joint according to claim 1, characterized in that: The heat shrink tube (2) has a plurality of sections, the cross-sectional areas of the plurality of sections of the heat shrink tube (2) increase successively along the axial direction, the plurality of sections of the heat shrink tube (2) are integrally formed, and the plurality of closing pieces (3) have a plurality of ends, each of which is fixedly connected to the outer wall of the heat shrink tube (2) having different cross-sectional areas.

3. The fireproof and explosion-proof cable intermediate joint according to claim 2, characterized in that: The lengths of the ends of the plurality of closing members (3) that extend away from the heat shrink tube (2) and out of the connector housing (1) are the same.

4. The fireproof and explosion-proof cable intermediate joint according to claim 3, characterized in that: The inner wall of the joint housing (1) is stepped, and the outer wall of the heat shrink tube (2) matches the inner wall of the joint housing (1).

5. The fireproof and explosion-proof cable intermediate joint according to claim 4, characterized in that: The joint housing (1) is provided with a groove (4), and one end of the closure member (3) facing the joint housing (1) can be slidably embedded in the groove (4).

6. The fireproof and explosion-proof cable intermediate joint according to claim 5, characterized in that: A semi-annular heat dissipation port (5) is provided at one end of the joint housing (1) in the axial direction close to the pipe opening with the largest cross section of the heat shrink tube (2); the end with the largest cross section of the heat shrink tube (2) has the same area as the heat dissipation port (5); and the largest end of the heat shrink tube (2) can block the heat dissipation port (5) after shrinking.

7. The fireproof and explosion-proof cable intermediate joint according to claim 1, characterized in that: The fastening mechanism (6) comprises a fastening ring (601), a slider (602) and a connecting rod (603); the fastening ring (601) is fixedly sleeved on the outer wall of the cable; the outer wall of the fastening ring (601) is provided with a sliding groove along the axial direction; the sliding groove (602) is connected in the sliding groove by sliding along the axial direction of the fastening ring (601); one end of the connecting rod (603) is rotatably connected to the sliding groove; the end of the connecting rod (603) originally away from the sliding groove (602) is rotatably connected to the closing member (3) located at the head and tail of the joint housing (1); the connecting rod (603) is rotatably connected to the end of the closing member (3) away from the heat shrink tube (2).

8. The fireproof and explosion-proof cable intermediate joint according to claim 7, characterized in that: An end of the closure member (3) close to the heat shrink tube (2) is fixedly connected to an arc plate (7) matching the outer wall of the heat shrink tube (2), and the inner side of the arc plate (7) is fixedly connected to the outer wall of the heat shrink tube (2).

9. The fireproof and explosion-proof cable intermediate joint according to claim 8, characterized in that: The outer wall of the closure member (3) is provided with an inclined placement groove, the interior of the placement groove is filled with powdered flame retardant, and the closure member (3) can slide to open the placement groove.

10. A method for using the cable intermediate joint according to any one of claims 1 to 9, characterized in that: S1: Put the heat shrink tube on the connection of the inner conductor of the cable; S2: buckle and fix the upper shell and the lower shell; S3: Seal the connection between the connector housing and the inner conductor of the cable.

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