High-temperature-resistant cable connecting device

Abstract

The utility model discloses a high-temperature-resistant cable connecting device, which relates to the technical field of cable equipment and comprises a protective sleeve provided with a first mounting hole, and threads are arranged on the outer walls of the two ends of the protective sleeve; the connecting piece is used for connecting two cables, is conductive and is arranged in the first mounting hole in a sliding manner; the sealing sleeve is provided with a second mounting hole, a first mounting groove and a first threaded groove which are communicated with one another, the second mounting hole is used for a cable to pass through, and the first threaded groove is located at the shaft end of the sealing sleeve and is in threaded fit with the protective sleeve; the clamping sleeve and the first sealing ring sleeve the cable and are located in the first mounting groove, and the clamping sleeve is provided with a second thread groove with an opening facing the protective sleeve; the protective sleeve is provided with a mounting cylinder, and the outer side wall of the mounting cylinder is provided with threads and is in threaded connection with the clamping sleeve. The first sealing ring is positioned between the shaft end of the mounting cylinder and the clamping sleeve; and the sealing effect of the high-temperature-resistant cable connecting device at the connecting part is relatively good due to multiple sealing.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable equipment technical field, especially a kind of high temperature resistant cable connecting device. BACKGROUND

[0002] Submersible pump cable is the special power transmission equipment matched with submersible electric pump unit, mainly used for the power supply of high temperature, high pressure and strong corrosion environment in oil well downhole, connecting ground control cabinet and downhole unit, and high temperature resistant cable connecting device is used to connect the end of two cables in the environment.

[0003] The connecting part of the high temperature resistant cable connecting device in the prior art has only one seal, and the connecting part will deform, such as thermal expansion, in a high temperature and high pressure environment, causing the connecting part to loosen and eventually leading to seal failure, which affects the normal operation of the cable. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a kind of high temperature resistant cable connecting device, to solve the technical problem that the sealing performance of high temperature resistant cable connecting device in prior art is poor and prone to seal failure.

[0005] To achieve the above-mentioned purpose, the utility model provides a kind of high temperature resistant cable connecting device, comprising:

[0006] A protective sleeve is provided with a first mounting hole for the cable to pass through, and the outer wall of both ends of the protective sleeve is provided with a thread;

[0007] A connecting piece is used to connect two cables and conduct electricity, and is slidingly arranged in the first mounting hole;

[0008] Two sealing assemblies are provided, each comprising a sealing sleeve, a clamping sleeve and a first sealing ring; the sealing sleeve is provided with a second mounting hole, a first mounting slot and a first thread groove in communication with each other, the second mounting hole is used for the cable to pass through, and the first thread groove is located at the shaft end of the sealing sleeve and is matched with the thread of the protective sleeve; the clamping sleeve and the first sealing ring are both sleeved on the cable and located in the first mounting slot, and the clamping sleeve is provided with a second thread groove with an opening facing the protective sleeve; the protective sleeve is provided with a mounting cylinder, the outer side wall of the mounting cylinder is provided with a thread and is connected with the clamping sleeve; the first sealing ring is located between the shaft end of the mounting cylinder and the clamping sleeve.

[0009] Optionally, the outer contour of the first sealing ring is conical with the tapered tip side facing the protective sleeve, and the mounting cylinder is provided with a conical groove matched with the first sealing ring.

[0010] Optionally, the first sealing ring comprises a first mounting ring and a first conical ring, the first conical ring having elastic deformation capacity; the first conical ring is matched with the mounting cylinder; and the first conical ring is arranged on the first mounting ring.

[0011] Optionally, the sealing sleeve is provided with a first taper surface at the joint of the first threaded groove and the first mounting groove, and the protective sleeve is provided with a second taper surface for abutting against the first taper surface.

[0012] Optionally, the sealing assembly further comprises a compression sleeve, a compression ring set and a second sealing ring.

[0013] The compression sleeve is provided with a third mounting hole for the cable to pass through, and the outer sidewall of the compression sleeve is provided with threads; the end of the sealing sleeve away from the protective sleeve is provided with a second mounting groove and a third threaded groove in communication, the third threaded groove is located at the axial end of the sealing sleeve and is threadedly matched with the compression sleeve; the compression ring set and the second sealing ring are both arranged outside the cable and located in the second mounting groove, and the compression sleeve extrudes the compression ring set to abut against the second sealing ring, so that the second sealing ring abuts against the groove bottom of the second mounting groove.

[0014] Optionally, the outer contour of the second sealing ring is conical and the tapered tip side faces the protective sleeve, and the sealing sleeve is provided with a conical groove matched with the second sealing ring.

[0015] Optionally, the second sealing ring comprises a second mounting ring and a second conical ring, the second conical ring having elastic deformation capacity; the second conical ring is matched with the protective sleeve; and the second conical ring is arranged on the second mounting ring.

[0016] Optionally, the compression ring set comprises a gasket, a graphite packing and a compression ring arranged in sequence along the cable; the gasket abuts against the compression sleeve; and the compression ring abuts against the sealing sleeve.

[0017] Optionally, the number of graphite packings is multiple.

[0018] Optionally, the outer side of the connecting piece is provided with multiple high-temperature insulation layers, the high-temperature insulation layers wrapping the joint of the cable and the connecting piece and the body of the connecting piece.

[0019] The utility model discloses a kind of high-temperature-resistant cable connecting devices, two cables are connected by connecting piece and conduct electricity, protective sleeve has preliminary protective sealing effect to cable;Sealing sleeve and protective sleeve are connected after screwing, and the first sealing is provided for cable at screwing connection;At this time, the sleeve and installation cylinder are connected by screwing, and the second sealing is formed by the contact of sleeve inner wall and installation cylinder outer wall;And installation cylinder abuts first sealing ring contact sleeve bottom, further perfect the sealing between sleeve and installation cylinder;In summary, multiple sealing makes the sealing effect of high-temperature-resistant cable connecting device at connecting part better. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the following embodiment or prior art description will be simply introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the structure shown in these drawings without creative labor for those skilled in the art.

[0021] Figure 1 It is the structural schematic diagram of high-temperature-resistant cable connecting device of the utility model embodiment;

[0022] Figure 2 It is Figure 1 the enlarged view of A of

[0023] Figure 3 It is the enlarged view of B of Figure 1 .

[0024] Figure: 10, protective sleeve;101, first mounting hole;102, installation cylinder;103, second taper;20, connecting piece;301, sealing sleeve;3011, second mounting hole;3012, first installation slot;3013, first thread groove;3014, first taper;302, sleeve;3021, second thread groove;303, first sealing ring;3031, first mounting ring;3032, first conical ring;304, compression sleeve;305, compression ring group;3051, gasket;3052, graphite packing;3053, compression ring;306, second sealing ring;3061, second mounting ring;3062, second conical ring;40, high-temperature insulation layer. DETAILED DESCRIPTION

[0025] The technical scheme in the embodiments of the utility model will be described clearly and completely in the following by combining with the drawings in the embodiments of the utility model, obviously, the described embodiments are only part of the embodiments of the utility model, not all embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0026] It should be noted that all directional indications, such as upper, lower, left, right, front, back, and the like, are used for explanation purposes only and do not limit the position, movement, and the like of the components in the specific attitude (as shown in the drawings). If the specific attitude changes, the directional indications also change accordingly.

[0027] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixing" and the like should be understood broadly, for example, "fixing" can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium; can be internal communication of two elements or interaction relationship of two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In addition, if the present application has a description of "first", "second" and the like, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. For example, "A and / or B" includes A solution, or B solution, or A and B solution. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

[0029] Example 1

[0030] Reference Figures 1 to 3The application relates to a high-temperature-resistant cable connecting device, which comprises a protective sleeve 10, a first mounting hole 101 for cable penetration is arranged in the protective sleeve 10, and the outer wall of the two ends of the protective sleeve 10 is provided with threads; a connecting piece 20 is arranged in the first mounting hole 101 and is used for connecting and conducting electricity of two cables; two sealing assemblies are arranged, and the sealing assembly comprises a sealing sleeve 301, a clamping sleeve 302 and a first sealing ring 303; the sealing sleeve 301 is provided with a second mounting hole 3011, a first mounting groove 3012 and a first threaded groove 3013 which are communicated with each other, the second mounting hole 3011 is used for cable penetration, and the first threaded groove 3013 is arranged at the shaft end of the sealing sleeve 301 and is matched with the threads of the protective sleeve 10; the clamping sleeve 302 and the first sealing ring 303 are arranged on the cables and are located in the first mounting groove 3012, and the clamping sleeve 302 is provided with a second threaded groove 3021 which is open towards the protective sleeve 10; the protective sleeve 10 is provided with a mounting cylinder 102, the outer side wall of the mounting cylinder 102 is provided with threads and is connected with the clamping sleeve 302 in a threaded mode, and the first sealing ring 303 is located between the shaft end of the mounting cylinder 102 and the clamping sleeve 302.

[0031] Two cables penetrate the second mounting hole 3011 of the sealing sleeve 301 respectively and are then connected to the connecting piece 20, the connecting piece 20 is used for electrically connecting the two cables; the connecting piece 20 is located in the first mounting hole 101 of the protective sleeve 10, so that the protective sleeve 10 has a primary sealing effect on the cables; the sealing sleeve 301 and the protective sleeve 10 are connected in a threaded mode to provide the first sealing for the cables; the clamping sleeve 302 is connected with the mounting cylinder 102 in a threaded mode, the inner wall of the clamping sleeve 302 and the outer wall of the mounting cylinder 102 are in contact to form the second sealing; the mounting cylinder 102 abuts against the first sealing ring 303 to contact the bottom of the clamping sleeve 302, so that the sealing between the clamping sleeve 302 and the mounting cylinder 102 is further improved; in summary, the multiple sealings make the sealing effect of the high-temperature-resistant cable connecting device at the connecting position better.

[0032] In the embodiment, the high-temperature-resistant cable connecting device can resist high temperature of 350 DEG C for a long time under high pressure of 35 MPa, can isolate the environment containing hydrogen sulfide and carbon dioxide in external well fluid, and can prevent RGD phenomenon (a process and phenomenon that rubber sealing material is chemically degraded, physical performance is sharply reduced (such as hardness change, tensile strength reduction, volume swelling) and finally loses sealing function).

[0033] The protective sleeve 10 can be made of hard metal material, so that the deformation of the protective sleeve 10 does not affect the connection of the cables and the connecting piece 20.

[0034] The sealing sleeve 301, the clamping sleeve 302 and the pressing sleeve 304 can be made of metal material.

[0035] As an optional implementation, the connecting piece 20 can be a copper sleeve, and the two shaft ends of the connecting piece 20 can be provided with counterbores. By inserting the copper core of the cable into the counterbores of the connecting piece 20, the conductive connection between the connecting piece 20 and the cable can be completed.

[0036] As an optional implementation, the outer contour of the first sealing ring 303 is conical, and the conical tip side faces the protective sleeve 10. The mounting cylinder 102 is provided with a conical groove matched with the first sealing ring 303.

[0037] When the clamping sleeve 302 is threadedly connected with the mounting cylinder 102, the clamping sleeve 302 presses the first sealing ring 303 into the conical groove of the mounting cylinder 102. The sidewall of the conical groove compresses the first sealing ring 303 to deform towards the center of the first sealing ring 303, so that the inner wall of the first sealing ring 303 extrudes and tightly abuts the outer wall of the protective layer of the cable, thereby improving the sealing effect.

[0038] As an optional implementation, the first sealing ring 303 includes a first mounting ring 3031 and a first conical ring 3032, and the first conical ring 3032 has elastic deformation capability. The first conical ring 3032 is matched with the mounting cylinder 102, and the first conical ring 3032 is arranged on the first mounting ring 3031.

[0039] The first sealing ring 303 is split into the first mounting ring 3031 and the first conical ring 3032, which can avoid stress concentration. If the first sealing ring 303 is integrally formed, the first sealing ring 303 may be broken when it is deformed towards the center under stress. The shaft end of the first mounting ring 3031 can be provided with an annular protrusion, and the first conical ring 3032 can be provided with an annular groove. The first conical ring 3032 is sleeved on the protrusion of the first mounting ring 3031, thereby completing the connection between the first mounting ring 3031 and the first conical ring 3032.

[0040] As an optional implementation, the sealing sleeve 301 is provided with a first taper surface 3014 at the connection between the first threaded groove 3013 and the first mounting groove 3012, and the protective sleeve 10 is provided with a second taper surface 103 for abutting against the first taper surface 3014.

[0041] The first conical surface 3014 can be arranged at an angle of 45 degrees with the axis of the sealing sleeve 301; after the sealing sleeve 301 is threadedly connected with the protective sleeve 10, the first conical surface 3014 and the second conical surface 103 abut each other, improving the sealing effect of the sealing sleeve 301 and the protective sleeve 10. The sealing sleeve 301 and the protective sleeve 10 can be made of the same metal material; when the sealing sleeve 301 and the protective sleeve 10 are located in the high-temperature and high-pressure ring 3053, the sealing sleeve 301 and the protective sleeve 10 will simultaneously expand due to heat; since the materials of the two are the same, the deformation amounts are also approximately similar, so that the first conical surface 3014 and the second conical surface 103 can still be in close contact in the state of thermal deformation, so that the sealing effect of the sealing sleeve 301 and the protective sleeve 10 is better.

[0042] As an optional embodiment, the sealing assembly further comprises a compression sleeve 304, a compression ring set 305, and a second sealing ring 306.

[0043] The compression sleeve 304 is provided with a third mounting hole for the cable to pass through, and the outer side wall of the compression sleeve 304 is provided with threads; the end of the sealing sleeve 301 away from the protective sleeve 10 is provided with a second mounting groove and a third threaded groove in communication, and the third threaded groove is located at the axial end of the sealing sleeve 301 and threadedly cooperates with the compression sleeve 304; the compression ring set 305 and the second sealing ring 306 are both sleeved on the outside of the cable and located in the second mounting groove; the compression sleeve 304 extrudes the compression ring set 305 to abut against the second sealing ring 306, so that the second sealing ring 306 abuts against the groove bottom of the second mounting groove.

[0044] After the compression sleeve 304 is threadedly connected with the sealing sleeve 301, the compression sleeve 304 axially compresses the compression ring set 305, so that the compression ring set 305 compresses the second sealing ring 306 to abut against the groove bottom of the second mounting groove; the threadedly connection between the compression sleeve 304 and the sealing sleeve 301 belongs to the first sealing, and the second sealing ring 306 belongs to the second sealing; the two sealings make the end of the sealing sleeve 301 away from the protective sleeve 10 also have a better sealing effect.

[0045] The outer diameter of the compression ring set 305 can be the same as the inner diameter of the second mounting groove, so that the compression ring set 305 can play a sealing effect to a certain extent.

[0046] As an optional embodiment, the outer contour of the second sealing ring 306 is conical and the tapered tip side faces the protective sleeve 10; the sealing sleeve 301 is provided with a conical groove matched with the second sealing ring 306.

[0047] When the compression ring set 305 axially extrudes the second sealing ring 306, the second sealing ring 306 is partially inserted into the conical groove of the sealing sleeve 301; at this time, the sealing sleeve 301 will exert a radial pressure on the second sealing ring 306, so that the second sealing ring 306 tightly abuts against the outer wall of the protective layer of the cable, so that the sealing effect of the second sealing ring 306 is better.

[0048] As an optional implementation, the second sealing ring 306 comprises a second mounting ring 3061 and a second tapered ring 3062, the second tapered ring 3062 has elastic deformation ability; the second tapered ring 3062 is matched with the protective sleeve 10; the second tapered ring 3062 is arranged on the second mounting ring 3061.

[0049] The second sealing ring 306 is split into the second mounting ring 3061 and the second tapered ring 3062, which can avoid stress concentration. The shaft end of the second mounting ring 3061 can be provided with an annular protrusion, and the second tapered ring 3062 can be provided with an annular groove, and the second tapered ring 3062 is sleeved on the protrusion of the second mounting ring 3061, thereby completing the connection of the second mounting ring 3061 and the second tapered ring 3062.

[0050] As an optional implementation, the compression ring group 305 comprises a gasket 3051, a graphite packing 3052 and a compression ring 3053 arranged in sequence along the cable; the gasket 3051 abuts against the compression sleeve 304; the compression ring 3053 abuts against the sealing sleeve 301.

[0051] The graphite packing 3052 is located between the gasket 3051 and the compression ring 3053, which can avoid the deformation of the graphite packing 3052 due to the axial extrusion of the compression sleeve 304 and the sealing sleeve 301, thereby affecting the sealing effect. The graphite packing 3052 is mainly made of graphite wire reinforced by various reinforcing fibers, metal wires (steel wire, copper wire, nickel wire, carbon fiber, pre-oxidized wire, glass yarn) and other materials, which is suitable for dynamic sealing under high temperature and high pressure conditions. It can be used to seal hot water, superheated steam, heat transfer fluid, ammonia solution, hydrocarbon, low temperature liquid and other media.

[0052] The number of graphite packings 3052 can be multiple, so as to improve the sealing effect between the compression sleeve 304 and the sealing sleeve 301.

[0053] As an optional implementation, the outer side of the connecting piece 20 is provided with a plurality of high-temperature insulation layers 40, which wrap the connection between the cable and the connecting piece 20 and the body of the connecting piece 20.

[0054] The number of high-temperature insulation layers 40 can be 5, and from inside to outside, it can include two high-temperature resistant 350℃ raw material belts, two high-temperature resistant 350℃ polyimide films and one mica adhesive tape. The high-temperature insulation layer 40 mainly plays the role of insulation and ionization prevention, which isolates the protective sleeve 10 and the connecting piece 20, and prevents the air in the first mounting hole 101 from contacting the cable or the connecting piece 20.

[0055] The cable comprises, from inside to outside, a copper core, an insulation layer and a protective layer, the copper core is matched with the countersunk hole of the connecting piece 20, the high-temperature insulation layer 40 is wrapped outside the insulation layer of the cable and the connecting piece 20, and the first mounting hole 101, the second mounting hole 3011 and the third mounting hole are all matched with the protective layer.

[0056] The installation process of the high-temperature-resistant cable connecting device:

[0057] First, the two cables are respectively and successively sleeved with the compression sleeve 304, the gasket 3051, the graphite packing 3052, the compression ring 3053, the second sealing ring 306, the sealing sleeve 301, the clamping sleeve 302 and the first sealing ring 303, one of the cables is inserted into the countersunk hole of the connecting piece 20 through the protective sleeve 10, the other cable is inserted into the other countersunk hole of the connecting piece 20, the cable and the connecting piece 20 can be crimped through a crimping tool, then the direct current resistance of the two cables is tested to check the continuity and whether the contact is good, the surface of the cable and the connecting piece 20 is polished, two layers of high-temperature-resistant 350 DEG C raw material belts, two layers of high-temperature-resistant 350 DEG C polyimide films and one layer of mica adhesive tape are wound in sequence, the protective sleeve 10 is moved to the outside of the connection between the cable and the connecting piece 20, and the connecting piece 20 is located in the middle of the protective sleeve 10, and the clamping sleeve 302 is tightened with the mounting cylinder 102 of the protective sleeve 10 by using a special wrench, so that the clamping sleeve 302 becomes the first sealing structure.

[0058] After the first sealing is completed, the sealing sleeve 301 is threadedly connected with the protective cap, and an appropriate torque is struck, so that the first taper surface 3014 of the sealing sleeve 301 is in close contact with the second taper surface 103 of the protective sleeve 10, and a seal is formed; then the compression sleeve 304 is threadedly connected with the sealing sleeve 301, so that the compression sleeve 304 extrudes the gasket 3051, the graphite packing 3052, the compression ring 3053 and the second sealing ring 306, the second sealing ring 306 abuts against the sealing sleeve 301, and the second sealing structure is formed.

[0059] After the assembly is completed, the high-temperature-resistant cable connecting device is subjected to a long-term temperature resistance test under the condition of 350 DEG C high temperature and 21 MPa high pressure, and is subjected to multiple cycles under the temperature and pressure, after the test is completed, the device is tested again under the condition of normal temperature and pressure, and the insulation and electrical performance still meet the international standards.

[0060] The above only describes optional embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made according to the utility model specification and the drawing contents, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A high temperature resistant cable connection device, characterized in that, The utility model relates to a cable protection device, which comprises: a protective sleeve with a first installation hole for a cable to pass through, and a thread on the outer wall of the two ends of the protective sleeve; a connecting piece for connecting two cables and conducting electricity, and slidingly arranged in the first installation hole; two sealing assemblies, each comprising a sealing sleeve, a clamping sleeve and a first sealing ring; the sealing sleeve is provided with a second installation hole for a cable to pass through, a first installation slot and a first thread slot which are in communication with each other, and the first thread slot is located at the axial end of the sealing sleeve and is matched with the thread of the protective sleeve; the clamping sleeve and the first sealing ring are both arranged on the cable and located in the first installation slot, and the clamping sleeve is provided with a second thread slot with an opening facing the protective sleeve; the protective sleeve is provided with an installation cylinder, the outer wall of the installation cylinder is provided with a thread and is connected with the thread of the clamping sleeve; and the first sealing ring is located between the axial end of the installation cylinder and the clamping sleeve.

2. The high temperature resistant cable connection device of claim 1, wherein, The outer contour of the first sealing ring is conical, and the tip of the cone is directed towards the protective sleeve; and the installation cylinder is provided with a conical slot matched with the first sealing ring.

3. The high temperature resistant cable connection device of claim 2, wherein, The first sealing ring comprises a first installation ring and a first conical ring, the first conical ring has elastic deformation capacity, the first conical ring is matched with the installation cylinder, and the first conical ring is arranged on the first installation ring.

4. The high temperature resistant cable connection device of claim 1, wherein, The sealing sleeve is provided with a first taper surface at the connection between the first thread slot and the first installation slot, and the protective sleeve is provided with a second taper surface for abutting against the first taper surface.

5. The high temperature resistant cable connection device of claim 1, wherein, The sealing assembly further comprises a compression sleeve, a compression ring set and a second sealing ring; the compression sleeve is provided with a third installation hole for a cable to pass through, and the outer wall of the compression sleeve is provided with a thread; the end of the sealing sleeve away from the protective sleeve is provided with a second installation slot and a third thread slot which are in communication, and the third thread slot is located at the axial end of the sealing sleeve and is matched with the thread of the compression sleeve; the compression ring set and the second sealing ring are both arranged on the outer side of the cable and located in the second installation slot, the compression sleeve extrudes the compression ring set to abut against the second sealing ring, and the second sealing ring abuts against the bottom of the second installation slot.

6. The high temperature resistant cable connection device of claim 5, wherein, The outer contour of the second sealing ring is conical, and the tip of the cone is directed towards the protective sleeve; and the sealing sleeve is provided with a conical slot matched with the second sealing ring.

7. The high temperature resistant cable connection device of claim 6, wherein, The second sealing ring comprises a second installation ring and a second conical ring, the second conical ring has elastic deformation capacity, the second conical ring is matched with the protective sleeve, and the second conical ring is arranged on the second installation ring.

8. The high temperature resistant cable connection device of claim 5, wherein, The compression ring set comprises a gasket, a graphite packing and a compression ring arranged in sequence along the cable; the gasket abuts against the compression sleeve; and the compression ring abuts against the sealing sleeve.

9. The high temperature resistant cable connection device of claim 8, wherein, The number of graphite packings is multiple.

10. The high temperature resistant cable connection apparatus of claim 1, wherein, The outer side of the connecting piece is provided with multiple high-temperature insulation layers, which wrap the connection between the cable and the connecting piece and the body of the connecting piece.

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