An airtight, cold-resistant, low-smoke, flame-retardant instrument cable for use in explosive environments

Abstract

The present invention relates to the field of cable technology, and specifically to an airtight, cold-resistant, low-smoke, flame-retardant instrument cable for use in an explosive environment, comprising a protective sleeve, a cable body mechanism being arranged inside the protective sleeve, the cable body mechanism comprising an inner sleeve, a plurality of inner sleeves being evenly and equidistantly arranged inside the protective sleeve, a plurality of conductors being arranged at equal angles inside the inner sleeve along a circumferential direction, and a fire-resistant pad being sleeved on the outer side of the conductor. The present invention can utilize the heat dissipated during the use of the cable to perform insulation and preheating on the main structure of the cable, thereby improving the cold-resistant performance of the cable while promoting internal heat dissipation, and improving the connection stability between the various structures of the cable, so that the airtightness of the cable is effectively improved, and at the same time, the throttling effect of the heat-insulating shell and the guide ring can be fully utilized to improve the flame retardancy of the cable, so that the cable can be more compatible with the external environment, and the working stability of the cable can be improved while effectively expanding the application scope of the cable.

Description

Technical Field

[0001] The invention relates to the technical field of cables, in particular to an airtight, cold-resistant, low-smoke, flame-retardant instrument cable used in an explosive environment. Background Art

[0002] Cables used in explosive environments are specially designed to safely transmit power or signals in flammable and explosive environments. They use special technologies and materials such as flame retardant and explosion-proof to ensure that no secondary accidents caused by the cables themselves will occur in dangerous environments. Special processes and materials are required during the manufacturing process to meet explosion-proof requirements. They are widely used in industrial fields with explosive environments such as petroleum, chemical, coal, electric power, pharmaceuticals, aerospace, etc., and are indispensable special cables in these fields.

[0003] However, current cables usually improve different performances of the cables by stacking materials of different materials. It is difficult to simultaneously take into account the requirements for air tightness, cold resistance, heat dissipation and flame retardancy when the cables are used in explosive environments. Often, one fails to achieve the other, and the cable has a low degree of compatibility with the external environment, resulting in unstable and unreliable transmission of the cables and a low effective service life of the cables. Summary of the invention

[0004] The present invention provides an airtight, cold-resistant, low-smoke, flame-retardant instrument cable for use in an explosive environment, which can effectively solve the problem proposed in the above background technology that current cables usually improve different performances of the cables by stacking materials of different materials, and it is difficult to simultaneously take into account the requirements for airtightness, cold resistance, heat dissipation and flame retardancy of the cables when used in an explosive environment, and often the cable has a low degree of fit with the external environment, resulting in unstable and unreliable transmission of the cables and a low effective service life of the cables.

[0005] To achieve the above object, the present invention provides the following technical solution: an airtight cold-resistant low-smoke flame-retardant instrument cable for use in an explosive environment, comprising a protective sleeve, a cable body mechanism is arranged inside the protective sleeve, and the cable body mechanism comprises an inner sheath;

[0006] A plurality of inner sleeves are evenly and equidistantly installed inside the protective sleeve, a plurality of conductors are installed at equal angles in the inner sleeve along the circumferential direction, a refractory pad is sleeved on the outer side of the conductor, an insulating sleeve is installed on the outer side of the refractory pad, and a multi-integrated mechanism is installed on the outer side of the inner sleeve;

[0007] The multi-in-one structure includes a spacer;

[0008] A plurality of spacers are evenly and equidistantly installed on the inner side of the protective sleeve, a three-sided tube is installed in the middle of the side end face of the spacer, a temperature lock bag is installed on the outer side of the spacer, and a plurality of conduits are installed at equal angles along the circumferential direction on the edges of the end faces of both sides of the spacer, an insulation shell is installed at the end of the conduit, a guide ring is installed on the inner wall of the insulation shell, a valve body is installed in the middle of the side end face of the insulation shell, and a sleeve is installed at the end of the valve body;

[0009] A ring plug is symmetrically and slidably installed inside the sleeve, a through opening is opened in the middle of the side end face of the ring plug, a compression spring is installed on the edge of the side end face of the ring plug, a flat box is symmetrically installed on one side of the outer curved surface of the sleeve, a narrow plate is slidably installed inside the flat box, a multi-way tube is installed on the other side of the outer curved surface of the sleeve, and a number of thin tubes are installed at equal angles along the circumferential direction on the edge of the side end face of the temperature locking bag.

[0010] According to the above technical solution, a number of short tubes are installed at equal angles along the circumferential direction in the middle of the outer curved surface of the temperature lock bag, a connector is installed at the end of the short tube, a liquid filling tube is installed at both ends of the connector, a ring shell is installed at the end of the liquid filling tube, a spring is slidably installed inside the liquid filling tube, and a ball is rollingly installed on one side of the spring;

[0011] A ring plate is slidably installed inside the annular shell, a cable strip is installed at the side end surface of the ring plate corresponding to the spring position, a hollow sleeve is installed outside the annular shell, a number of air pipes are installed at equal angles along the circumferential direction on both sides of the inner curved surface of the hollow sleeve, and a support strip is installed inside the hollow sleeve.

[0012] According to the above technical solution, the guide ring is in an hourglass shape, and the space enclosed by the guide ring and the inner wall of the heat-insulating shell is filled with sulfur hexafluoride gas. The guide ring is made of elastic material, and the diameter of the through port decreases from one side of the valve body to the side of the compression spring.

[0013] The maximum gap between the two ring plugs is equal to the uncompressed length of the compression spring, and the compression spring is located between the two ring plugs. The thickness of the ring plug is greater than the diameter of the multi-way pipe.

[0014] According to the above technical solution, the cross-section of the flat box is T-shaped, and the space inside the flat box between the narrow plate and the sleeve is directly connected to the space inside the sleeve between the ring plug and the valve body, and the space inside the flat box on the other side of the narrow plate is directly connected to the inner cavity of the three-sided tube, and the interior of the three-sided tube is filled with sulfur hexafluoride gas.

[0015] According to the above technical solution, the multi-way tube is a five-way tube, and the space inside the sleeve corresponding to the ring plug position, the space inside the sleeve corresponding to the compression spring position, and the inner cavity of the temperature-locking bag are respectively connected to one port of the multi-way tube, the inner cavity of the temperature-locking bag is connected to the inner cavity of the septum through a thin tube, and the interior of the temperature-locking bag and the septum are both filled with sulfur hexafluoride gas.

[0016] According to the above technical solution, the ball fits with the liquid filling tube, and the spring is located between the ball and the ring plate, the space inside the annular shell between the ring plate and the liquid filling tube is directly connected to the liquid filling tube, and the annular shell and the liquid filling tube between the ball and the ring plate are filled with insulating oil, the space in the annular shell cavity on the other side of the ring plate is connected to the inner cavity of the hollow sleeve through the air pipe, the support bar is spiral, and the space inside the annular shell between the ring plate and the air pipe and the inside of the hollow sleeve are filled with sulfur hexafluoride gas, and the end of the rope is fixedly connected to the spring.

[0017] According to the above technical solution, the inner part of the inner sheath is filled with inner filling at the position outside the insulating sheath, the outer curved surface of the inner sheath is embedded with a sub-shielding net, the outer side of the temperature-locking bag is installed with an inner sheath, the inner wall of the inner sheath is installed at the positions corresponding to the two ends of the temperature-locking bag, the inner part of the inner sheath is filled with outer filling at the position outside the inner sheath, and one side of the side end surface of the inner sheath is embedded with a drainage line;

[0018] The outer side of the inner sheath is sleeved with a total shielding sleeve, the outer side of the total shielding sleeve is wrapped with a tape, the outer side of the tape is installed with an outer sheath, the outer side of the outer sheath is sleeved with an armored sleeve, the outer side of the armored sleeve is filled with a gap filler, the outer side of the gap filler is installed with an outer sheath at the inner side of the protective sleeve, the outer curved surface of the inner sheath is provided with an annular groove at the position of the annular shell, the outer curved surface of the outer sheath is provided with an outer groove at the position of the hollow sleeve, the outer curved surface of the temperature locking bag is provided with an elastic strip, and the inner curved surface of the inner sheath is provided with a wire groove at the position of the elastic strip.

[0019] According to the above technical solution, the inner sleeves are distributed in a circular array, and the spacers and three-sided tubes are matched with the inner sleeves, the wire grooves are matched with the elastic strips, and the elastic strips are spiral.

[0020] According to the above technical solution, the sealing ring is distributed adjacent to the inner sheath, and the gaps between the spacer, three-sided tube, temperature lock bag, catheter, insulation shell, valve body, sleeve, flat box, multi-way tube and thin tube and the inner sheath are all filled with external filling, and the external filling, internal filling and gap filling are all flame-retardant low-smoke hot melt adhesive.

[0021] According to the above technical scheme, the inner sheath, fire-resistant pad, inner sheath and outer sheath are all polyolefin oxygen barrier materials, the armor sheath is woven with galvanized steel wire, the wrapping tape and outer sheath are all alkali-free glass fiber tapes, and the insulating sheath, sealing ring and protective sheath are all cold-resistant halogen-free polymer blends.

[0022] Compared with the prior art, the invention has the following beneficial effects: the invention has a scientific and reasonable structure and is safe and convenient to use;

[0023] 1. It is equipped with a multi-in-one mechanism. Through the cooperation of the spacer, three-sided tube and temperature-locking bag, an energy secondary adjustment structure can be constructed to achieve the guidance and reuse of heat, which can effectively maintain the temperature stability of the cable during use. It can cooperate with the conduit, insulation shell, guide ring, valve body, sleeve, ring plug, port, compression spring, flat box, narrow plate, multi-way tube and thin tube to form a complete circulation loop of sulfur hexafluoride gas. On the one hand, the heat generated during the use of the cable can be redistributed during the flow of sulfur hexafluoride gas. The heat dissipated during the use of the cable can be effectively used in the heat transfer process to insulate and preheat the main structure of the cable. It can promote internal heat dissipation while taking into account the temperature stability of the external main structure, which can effectively improve the cold resistance of the cable, fully ensure the performance stability and integrity of the main structure during the use of the cable, and promote the thermal balance of various parts inside the cable;

[0024] On the other hand, the fluidity of sulfur hexafluoride gas can be effectively utilized to disperse and transform the impact pressure during use, which can effectively improve the compressive strength of the cable and the anti-interference ability of the cable. At the same time, the airflow pressure can provide stable elastic support between the internal structures of the cable, which can not only effectively improve the connection stability between the cable structures and the fit and density between the structures, but also effectively improve the air tightness of the cable, so that the cable can better meet the air tightness requirements for use in explosive environments. On the other hand, the throttling effect of the thermal insulation shell and the guide ring can be fully utilized to ensure the overall linkage between the various parts of the cable while retaining the relative independence of each part. The cable can be protected in sections, which can not only prevent the spread of fire with the help of sulfur hexafluoride gas in the event of an accidental fire, but also greatly improve the flame retardant effect of the cable and can timely and effectively cut off the connection at the fault point to avoid the expansion of losses, thereby greatly improving the safety of cable use.

[0025] 2. By cooperating with short tubes, connectors, liquid-filled tubes, ring shells, springs, balls, ring plates and cables, a variable heat-conducting structure can be constructed, which can further transform and utilize the temperature and pressure changes during the use of the cable. In combination with hollow sleeves, air pipes and support strips, the heat dissipation and thermal insulation performance of the cable can be dynamically regulated. On the one hand, when the temperature inside the cable is too high, the overall thermal conductivity of the cable can be actively improved, the heat dissipation capacity of the cable can be improved, the heat dissipation effect can be further enhanced, and the heat dissipation work can be timely and effective, which can fully ensure the balance and safety of the internal temperature of the cable, effectively improve the transmission reliability of the cable, reduce the probability of high-temperature damage to the cable, and effectively increase the service life of the cable;

[0026] On the other hand, it can actively and automatically reduce the overall thermal conductivity of the cable in severe cold environments, and cooperate with the temperature-locking bag to form a double temperature-locking structure, which can effectively enhance the thermal insulation and preheating effect of the temperature-locking bag, thereby making the cable more compatible with the external environment. While improving the working stability of the cable, it can effectively expand the scope of application of the cable.

[0027] 3. A cable body mechanism is provided. Through the coordination of the inner sheath, conductor, fire-resistant pad, insulating sheath, inner filling, inner sheath, sealing ring and outer filling, the internal arrangement can be more compact, the internal structure is dense, and the density of the cable is increased. While improving the stability of the internal structure of the cable, the effective utilization rate of the internal space of the cable can be effectively improved, so that it has a higher conductor current carrying capacity than ordinary conductors. Through the coordination of the sub-shielding net and the total shielding sleeve, the electromagnetic interference between the internal cables and the external electromagnetic interference can be fully avoided during the working process, and the anti-interference effect of the cable can be effectively enhanced, so that the transmission performance of the cable can be fully utilized. The existence of the drainage line can effectively improve the anti-static effect of the cable and greatly improve the safety of use. The existence of the ring groove, the outer groove, the wire trough and the elastic strip can further improve the air tightness of the cable and strengthen the fit between the structures;

[0028] Through the coordination of the wrapping tape, outer sheath, armored sleeve, outer sheath and gap filling, the excellent heat resistance, aging resistance and electrical insulation performance of the hot melt adhesive can be fully utilized. On the one hand, after hot melting, it can quickly penetrate into the surface of the cable to form a tough bonding layer, so that the cable materials are firmly combined together, reducing cable failures and accidents caused by loosening, falling off, etc. On the other hand, its excellent temperature resistance can be fully utilized to enable it to maintain stable performance at high or even extreme temperatures, ensuring the normal operation of wires and cables, and ensuring a close combination between the core and the outer sheath, effectively preventing deformation and external interference of the cable, and maintaining the softness and pressure resistance of the cable, thereby improving the tensile strength of the cable.

[0029] In summary, this cable integrates heat dissipation, heat preservation, flame retardancy and cold resistance, and effectively enhances the overall air tightness of the cable. At the same time, the thermal conduction efficiency of the cable is adjustable, which can effectively take into account the balance and stability between various performances, greatly improve its working stability and safety, and the internal arrangement of the cable is more compact, which effectively increases the conductive area of ​​the cable, improves the transmission performance and conductivity of the cable, and improves the explosion-proof safety performance of the product by optimizing the cable structure and manufacturing process, making its use safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0031] In the attached picture:

[0032] Figure 1 It is a schematic diagram of the structure of the present invention;

[0033] Figure 2 It is a schematic diagram of the inner sheath installation structure of the present invention;

[0034] Figure 3 It is a schematic diagram of the structure of the multi-in-one mechanism of the present invention;

[0035] Figure 4 It is a schematic diagram of the spacer installation structure of the present invention;

[0036] Figure 5 It is a schematic diagram of the three-sided tube installation structure of the present invention;

[0037] Figure 6 It is a schematic diagram of the cable body structure of the present invention;

[0038] Figure 7 It is a schematic diagram of the conductor installation structure of the present invention;

[0039] Figure 8 It is a schematic diagram of the compression spring installation structure of the present invention;

[0040] Numbers in the figure: 1, protective cover;

[0041] 200, multi-in-one mechanism; 201, diaphragm; 202, three-sided tube; 203, temperature lock bag; 204, catheter; 205, heat insulation shell; 206, guide ring; 207, valve body; 208, sleeve; 209, ring plug; 210, through port; 211, compression spring; 212, flat box; 213, narrow plate; 214, multi-way tube; 215, thin tube; 216, short tube; 217, connector; 218, liquid filling tube; 219, ring shell; 220, spring; 221, ball; 222, ring plate; 223, cable; 224, hollow sleeve; 225, air pipe; 226, support bar;

[0042] 300, cable body structure; 301, inner sheath; 302, conductor; 303, fire-resistant pad; 304, insulating sheath; 305, inner filling; 306, sub-shielding net; 307, inner sheath; 308, sealing ring; 309, outer filling; 310, drainage line; 311, overall shielding sleeve; 312, wrapping tape; 313, outer sheath; 314, armored sleeve; 315, gap filling; 316, outer sheath; 317, ring groove; 318, outer groove; 319, wire trough; 320, elastic strip. DETAILED DESCRIPTION

[0043] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0044] Example: Figure 1-8As shown, the present invention provides a technical solution, an airtight cold-resistant low-smoke flame-retardant instrument cable for use in an explosive environment, comprising a protective sleeve 1, a cable body mechanism 300 is arranged inside the protective sleeve 1, and the cable body mechanism 300 comprises an inner sleeve 301, a conductor 302, a fire-resistant pad 303, an insulating sleeve 304, an inner filling 305, a sub-shielding net 306, an inner sheath 307, a sealing ring 308, an outer filling 309, a drainage line 310, a total shielding sleeve 311, a wrapping tape 312, an outer sheath 313, an armored sleeve 314, a gap filling 315, an outer sleeve 316, a ring groove 317, an outer groove 318, a wire groove 319 and an elastic strip 320;

[0045] Several inner sleeves 301 are evenly and equidistantly installed inside the protective sleeve 1, several conductors 302 are installed at equal angles along the circumferential direction inside the inner sleeve 301, a refractory pad 303 is sleeved on the outside of the conductor 302, an insulating sleeve 304 is installed on the outside of the refractory pad 303, and a multi-integrated mechanism 200 is installed on the outside of the inner sleeve 301;

[0046] The multi-in-one mechanism 200 includes a spacer 201, a three-sided tube 202, a temperature-locking bag 203, a conduit 204, a heat-insulating shell 205, a guide ring 206, a valve body 207, a sleeve 208, a ring plug 209, a port 210, a compression spring 211, a flat box 212, a narrow plate 213, a multi-way tube 214, a thin tube 215, a short tube 216, a connector 217, a liquid-filled tube 218, a ring shell 219, a spring 220, a ball 221, a ring plate 222, a cable 223, a hollow sleeve 224, an air pipe 225 and a support bar 226;

[0047] A number of spacers 201 are evenly and equidistantly installed on the inner side of the protective sleeve 1, a three-sided tube 202 is installed in the middle of the side end face of the spacer 201, a temperature lock capsule 203 is installed on the outer side of the spacer 201, and a number of conduits 204 are installed at equal angles along the circumferential direction on the edges of the end faces of both sides of the spacer 201, and an insulating shell 205 is installed at the end of the conduit 204, and a guide ring 206 is installed on the inner wall of the insulating shell 205. The guide ring 206 is in an hourglass shape, and the space enclosed by the guide ring 206 and the inner wall of the insulating shell 205 is filled with sulfur hexafluoride gas. The guide ring 206 is made of elastic material to achieve flame retardancy when necessary. A valve body 207 is installed in the middle of the side end face of the insulating shell 205, and a sleeve 208 is installed at the end of the valve body 207;

[0048] A ring plug 209 is symmetrically slidably installed inside the sleeve 208, a through hole 210 is opened in the middle of the side end face of the ring plug 209, a compression spring 211 is installed on the edge of the side end face of the ring plug 209, a flat box 212 is symmetrically installed on one side of the outer curved surface of the sleeve 208, a narrow plate 213 is slidably installed inside the flat box 212, the cross section of the flat box 212 is T-shaped, and the space inside the flat box 212 between the narrow plate 213 and the sleeve 208 is directly connected to the space inside the sleeve 208 between the ring plug 209 and the valve body 207, and the space inside the flat box 212 on the other side of the narrow plate 213 is directly connected to the inner cavity of the three-sided tube 202, and the three-sided tube 202 is filled with sulfur hexafluoride gas to redistribute heat;

[0049] A multi-way tube 214 is installed on the other side of the outer curved surface of the sleeve 208. The diameter of the through port 210 decreases along the side of the valve body 207 to the side of the compression spring 211. The maximum gap between the two ring plugs 209 is equal to the uncompressed length of the compression spring 211, and the compression spring 211 is located between the two ring plugs 209. The thickness of the ring plug 209 is greater than the diameter of the multi-way tube 214 to improve the gas flow stability and heat exchange efficiency. The edge of the side end face of the temperature lock bag 203 is equipped with a number of fine The multi-way tube 214 is a five-way tube, and the space inside the sleeve 208 corresponding to the position of the ring plug 209, the space inside the sleeve 208 corresponding to the position of the compression spring 211 and the inner cavity of the temperature-locking capsule 203 are respectively connected to one port of the multi-way tube 214, and the inner cavity of the temperature-locking capsule 203 is connected to the inner cavity of the septum 201 through the capillary 215. The interior of the temperature-locking capsule 203 and the septum 201 are filled with sulfur hexafluoride gas to construct a complete circulation loop to promote heat exchange;

[0050] A plurality of short tubes 216 are installed at equal angles along the circumferential direction in the middle of the outer curved surface of the temperature lock bag 203, a connector 217 is installed at the end of the short tube 216, and a liquid filling tube 218 is installed at both ends of the connector 217. An annular shell 219 is installed at the end of the liquid filling tube 218, and a spring 220 is slidably installed inside the liquid filling tube 218. A ball 221 is rollingly installed on one side of the spring 220. A ring plate 222 is slidably installed inside the annular shell 219, and a rope strip 223 is installed at the position of the spring 220 on the side end surface of the ring plate 222. A hollow sleeve 224 is installed on the outside of the annular shell 219, and a plurality of air pipes 225 are installed at equal angles along the circumferential direction on both sides of the inner curved surface of the hollow sleeve 224.

[0051] A support bar 226 is installed inside the hollow sleeve 224, the ball 221 fits with the liquid filling tube 218, and the spring 220 is located between the ball 221 and the ring plate 222. The space inside the annular shell 219 between the ring plate 222 and the liquid filling tube 218 is directly connected to the liquid filling tube 218, and the annular shell 219 and the liquid filling tube 218 between the ball 221 and the ring plate 222 are filled with insulating oil. The space in the inner cavity of the annular shell 219 on the other side of the ring plate 222 is connected to the inner cavity of the hollow sleeve 224 through the air pipe 225. The support bar 226 is spiral, and the space in the inner cavity of the annular shell 219 between the ring plate 222 and the air pipe 225 and the inside of the hollow sleeve 224 are filled with sulfur hexafluoride gas. The end of the rope 223 is fixedly connected to the spring 220 to automatically adjust the thermal conductivity.

[0052] The inner portion of the inner sheath 301 is filled with an inner filler 305 at a position outside the insulating sheath 304, a sub-shielding net 306 is embedded and installed on the outer curved surface of the inner sheath 301, an inner sheath 307 is installed on the outer side of the temperature lock capsule 203, and sealing rings 308 are installed on the inner wall of the inner sheath 307 at positions corresponding to both ends of the temperature lock capsule 203, the inner portion of the inner sheath 307 is filled with an outer filler 309 at a position outside the inner sheath 301, and a drainage line 310 is embedded and installed on one side of the side end surface of the inner sheath 307;

[0053] The outer side of the inner sheath 307 is sleeved with a total shielding sleeve 311, the outer side of the total shielding sleeve 311 is wrapped with a wrapping tape 312, the outer side of the wrapping tape 312 is installed with an outer sheath 313, the outer side of the outer sheath 313 is sleeved with an armored sleeve 314, the outer side of the armored sleeve 314 is filled with a gap filler 315, the sealing ring 308 is adjacent to the inner sheath 307, and the gaps between the spacer 201, the three-sided tube 202, the temperature lock capsule 203, the conduit 204, the insulation shell 205, the valve body 207, the sleeve 208, the flat box 212, the multi-way tube 214 and the thin tube 215 and the inner sheath 301 are all filled with the outer filler 309, and the outer filler 309, the inner filler 305 and the gap filler 315 are all flame-retardant low-smoke hot melt adhesives to improve the stability and density of the cable structure;

[0054] The outer side of the gap filler 315 is located inside the protective sleeve 1 and an outer sleeve 316 is installed. The inner sleeve 301, the fireproof pad 303, the inner sheath 307 and the outer sheath 313 are all polyolefin oxygen barrier materials. The armor sleeve 314 is woven with galvanized steel wire. The wrapping tape 312 and the outer sheath 316 are both alkali-free glass fiber tapes. The insulating sleeve 304, the sealing ring 308 and the protective sleeve 1 are all cold-resistant halogen-free polymer blends to improve the overall transmission stability of the cable. The outer curved surface of the inner sheath 307 is opened at the position corresponding to the ring shell 219. There is an annular groove 317, an outer groove 318 is provided on the outer curved surface of the outer sheath 313 at the position corresponding to the hollow sheath 224, an elastic strip 320 is installed on the outer curved surface of the temperature lock bag 203, and a wire groove 319 is provided on the inner curved surface of the inner sheath 307 at the position corresponding to the elastic strip 320. The inner sheath 301 is distributed in a circular array, and the gasket 201 and the three-sided tube 202 are both matched with the inner sheath 301, the wire groove 319 is matched with the elastic strip 320, and the elastic strip 320 is spirally shaped to improve the air tightness and the fit between the structures.

[0055] The working principle and use process of the present invention are as follows: after the instantaneous pressure inside the sleeve 208 is exhausted, it is insufficient to provide the narrow plate 213 with a pressure sufficient to offset the pressure of the sulfur hexafluoride gas from inside the three-sided tube 202. The narrow plate 213 will be reset under the pressure of the sulfur hexafluoride gas inside the three-sided tube 202, and the sulfur hexafluoride gas inside the sleeve 208 will be pressed into the multi-way tube 214 from the two ports of the multi-way tube 214 located on both sides of the sleeve 208, thereby pressurizing the sulfur hexafluoride gas. After the pressure is exhausted, the ring plug 209 will be reset under the elastic force of the compression spring 211, thereby circulating and pressurizing the gas flowing into both sides of the sleeve 208.

[0056] Subsequently, the pressurized sulfur hexafluoride gas will enter the temperature-locking capsule 203 through the multi-way tube 214, and will flow back into the spacer 201 through the capillary 215. In the process of flowing through the capillary 215, the flow path will be narrowed, which will further increase the flow pressure of the sulfur hexafluoride gas, making the flow of the sulfur hexafluoride gas smoother. In the process of the flow of the sulfur hexafluoride gas, it will take out the heat emitted by the conductor 302, and through the temperature-locking capsule 203, the heat will be secondary arranged in the process of the flow of the sulfur hexafluoride gas, so that the heat is evenly distributed along the axial direction of the cable. While promoting the internal heat balance of the cable, the heat emitted by the cable can be used to insulate and preheat the cable along the axial direction to improve its cold resistance and ensure its performance stability.

[0057] At the same time, under the conduction effect of the short tube 216, the sulfur hexafluoride gas inside the temperature-locking capsule 203 will synchronously flow into the connector 217, and enter the liquid-filling tube 218 through the connector 217, applying pressure to the ball 221. Then, as the transmission work proceeds, the gas pressure of the sulfur hexafluoride gas inside the septum 201 rises as the heat emitted by the absorbing conductor 302, and the gas pressure of the sulfur hexafluoride gas inside the temperature-locking capsule 203 will also rise accordingly. The temperature when the gas pressure of the sulfur hexafluoride gas is sufficient to offset the elastic force of the spring 220 is taken as the adjustment temperature. When the gas pressure of the sulfur hexafluoride gas is sufficient to offset the elastic force of the spring 220, that is, when the temperature inside the temperature-locking capsule 203 reaches the adjustment temperature, the sulfur hexafluoride gas will push the ball 221 to roll inside the liquid-filling tube 218.

[0058] The ball 221 drives the ring plate 222 to slide inside the annular shell 219 through the insulating oil, and presses the inert gas inside the annular shell 219 into the hollow sleeve 224 through the air pipe 225, thereby increasing the overall thermal conductivity of the hollow sleeve 224, promoting the heat dissipation, and promoting heat dissipation, so that the internal temperature of the temperature-locking capsule 203 is maintained at the regulated temperature, and simultaneously taking into account both cold resistance and heat dissipation. In a cold environment, that is, when the heat dissipated by the conductor 302 is not enough to make the internal temperature of the temperature-locking capsule 203 reach the regulated temperature during the flow of sulfur hexafluoride gas, the ring plate 222 will be dragged toward the side of the ball 221 by the rope 223 under the elastic force of the spring 220, and the inert gas inside the hollow sleeve 224 will be filled into the annular shell 219, so as to reduce the overall thermal conductivity of the hollow sleeve 224, isolate and insulate the inside of the cable, and enhance the insulation and preheating effect of the sulfur hexafluoride gas inside the temperature-locking capsule 203;

[0059] Also during the use of the cable, the sulfur hexafluoride gas will provide sufficient elastic extrusion between the internal structures of the cable through the spacer 201 and the temperature-locking capsule 203, which can enhance the tightness of the connection between the various structures of the cable, strengthen the compactness of the concave-convex engagement of the sealing ring 308, the annular groove 317, the outer groove 318, the wire groove 319 and the elastic strip 320, and simultaneously improve the air tightness of the cable. When the cable is impacted by external force, during the elastic deformation of the temperature-locking capsule 203, the impact pressure will act on the sulfur hexafluoride gas, and disperse along the axial direction of the cable with the flow of the sulfur hexafluoride gas, and transfer part of the pressure to the sulfur hexafluoride gas inside the three-sided tube 202, which can achieve double unloading of the impact pressure.

[0060] At the same time, since the inner sheath 301 is arranged in a circular array, the internal structure of the cable can be arranged more compactly. The outer side of the conductor 302 and the outer side of the inner sheath 301 are respectively provided with a sub-shielding net 306 and a general shielding sleeve 311, which can fully avoid the electromagnetic interference between the internal cables and the external electromagnetic interference during the working process. The existence of the inner filling 305, the outer filling 309 and the gap filling 315 can give full play to the excellent heat resistance, aging resistance and electrical insulation performance of the hot melt adhesive.

[0061] After being heated and melted, the inner filling 305, the outer filling 309 and the gap filling 315 can quickly penetrate into the surface of the cable to form a tough adhesive layer, which firmly binds the cable materials together and reduces cable failures and accidents caused by loosening, falling off, etc. At the same time, it has excellent temperature resistance and can maintain stable performance at high temperatures or even extreme temperatures to ensure the normal operation of wires and cables. At the same time, hot melt adhesive is filled into the interior of the cable to ensure the fit between the inner sheath 301, the inner sheath 307, the outer sheath 313, the armored sheath 314 and the protective sheath 1, effectively preventing deformation of the cable and external interference.

[0062] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An airtight, cold-resistant, low-smoke, flame-retardant instrument cable for use in an explosive environment, comprising a protective sheath (1), characterized in that: A cable body mechanism (300) is arranged inside the protective sleeve (1), and the cable body mechanism (300) comprises an inner sleeve (301); A plurality of inner sleeves (301) are evenly and equidistantly installed inside the protective sleeve (1); a plurality of conductors (302) are installed at equal angles in the inner sleeve (301) along the circumferential direction; a fireproof pad (303) is sleeved on the outside of the conductor (302); an insulating sleeve (304) is installed on the outside of the fireproof pad (303); and a multi-in-one structure (200) is installed on the outside of the inner sleeve (301); The multi-element integrated structure (200) comprises a spacer (201); A plurality of spacers (201) are evenly and equidistantly mounted on the inner side of the protective sleeve (1); a three-sided tube (202) is mounted in the middle of the side end surface of the spacer (201); a temperature lock bag (203) is mounted on the outer side of the spacer (201); a plurality of conduits (204) are mounted at equal angles along the circumferential direction on the edges of the side end surfaces of the spacer (201); a heat insulating shell (205) is mounted at the end of the conduit (204); a guide ring (206) is mounted on the inner wall of the heat insulating shell (205); a valve body (207) is mounted in the middle of the side end surface of the heat insulating shell (205); and a sleeve (208) is mounted at the end of the valve body (207); A ring plug (209) is symmetrically and slidably mounted inside the sleeve (208), a through opening (210) is provided in the middle of the side end surface of the ring plug (209), a compression spring (211) is mounted on the edge of the side end surface of the ring plug (209), a flat box (212) is symmetrically mounted on one side of the outer curved surface of the sleeve (208), a narrow plate (213) is slidably mounted inside the flat box (212), a multi-way tube (214) is mounted on the other side of the outer curved surface of the sleeve (208), and a plurality of thin tubes (215) are mounted at equal angles along the circumferential direction on the edge of the side end surface of the temperature locking bag (203).

2. The airtight cold-resistant low-smoke flame-retardant instrument cable for use in an explosive environment according to claim 1, characterized in that: A plurality of short tubes (216) are installed at equal angles along the circumferential direction in the middle of the outer curved surface of the temperature-locking bag (203); a connector (217) is installed at the end of the short tube (216); a liquid filling tube (218) is installed at both ends of the connector (217); an annular shell (219) is installed at the end of the liquid filling tube (218); a spring (220) is slidably installed inside the liquid filling tube (218); a ball (221) is rollably installed on one side of the spring (220); A ring plate (222) is slidably mounted inside the annular shell (219), a cable strip (223) is mounted on the side end surface of the ring plate (222) at a position corresponding to the spring (220), a hollow sleeve (224) is mounted on the outside of the annular shell (219), a plurality of air pipes (225) are mounted at equal angles along the circumferential direction on both sides of the inner curved surface of the hollow sleeve (224), and a support strip (226) is mounted inside the hollow sleeve (224).

3. The airtight, cold-resistant, low-smoke, flame-retardant instrument cable for use in an explosive environment according to claim 1, characterized in that: The guide ring (206) is in an hourglass shape, and the space enclosed by the guide ring (206) and the inner wall of the heat-insulating shell (205) is filled with sulfur hexafluoride gas. The guide ring (206) is made of elastic material, and the diameter of the through hole (210) decreases from one side of the valve body (207) to one side of the compression spring (211); The maximum gap between the two ring plugs (209) is equal to the uncompressed length of the compression spring (211), and the compression spring (211) is located between the two ring plugs (209). The thickness of the ring plug (209) is greater than the diameter of the multi-way tube (214).

4. The airtight cold-resistant low-smoke flame-retardant instrument cable for use in an explosive environment according to claim 1, characterized in that: The flat box (212) has a T-shaped cross section, and the space inside the flat box (212) between the narrow plate (213) and the sleeve (208) is directly connected to the space inside the sleeve (208) between the ring plug (209) and the valve body (207), and the space inside the flat box (212) on the other side of the narrow plate (213) is directly connected to the inner cavity of the three-sided tube (202), and the interior of the three-sided tube (202) is filled with sulfur hexafluoride gas.

5. The airtight cold-resistant low-smoke flame-retardant instrument cable for use in an explosive environment according to claim 1, characterized in that: The multi-way tube (214) is a five-way tube, and the space inside the sleeve (208) corresponding to the position of the ring plug (209), the space inside the sleeve (208) corresponding to the position of the compression spring (211), and the inner cavity of the temperature-locking capsule (203) are respectively connected to one port of the multi-way tube (214), the inner cavity of the temperature-locking capsule (203) is connected to the inner cavity of the septum (201) via a thin tube (215), and the interiors of the temperature-locking capsule (203) and the septum (201) are both filled with sulfur hexafluoride gas.

6. The airtight cold-resistant low-smoke flame-retardant instrument cable for use in an explosive environment according to claim 2, characterized in that: The ball (221) fits with the liquid filling tube (218), and the spring (220) is located between the ball (221) and the ring plate (222). The space between the ring plate (222) and the liquid filling tube (218) inside the annular shell (219) is directly connected to the liquid filling tube (218), and the space between the ball (221) and the ring plate (222) inside the annular shell (219) and the liquid filling tube (218) is filled with Insulating oil, the inner cavity of the annular shell (219) located on the other side of the ring plate (222) is connected to the inner cavity of the hollow sleeve (224) through the air pipe (225), the support bar (226) is spiral, and the space inside the annular shell (219) located between the ring plate (222) and the air pipe (225) and the inside of the hollow sleeve (224) are filled with sulfur hexafluoride gas, and the end of the rope (223) is fixedly connected to the spring (220).

7. The airtight cold-resistant low-smoke flame-retardant instrument cable for use in an explosive environment according to claim 6, characterized in that: The inner portion of the inner sleeve (301) is filled with an inner filler (305) at a position outside the insulating sleeve (304); a shielding net (306) is embedded and installed on the outer curved surface of the inner sleeve (301); an inner sheath (307) is installed on the outer side of the temperature-locking capsule (203); sealing rings (308) are installed on the inner wall of the inner sheath (307) at positions corresponding to both ends of the temperature-locking capsule (203); an outer filler (309) is filled inside the inner sheath (307) at a position outside the inner sheath (301); and a drainage line (310) is embedded and installed on one side of the side end surface of the inner sheath (307); The outer side of the inner sheath (307) is sleeved with a general shielding sleeve (311), the outer side of the general shielding sleeve (311) is wrapped with a wrapping tape (312), the outer side of the wrapping tape (312) is installed with an outer sheath (313), the outer side of the outer sheath (313) is sleeved with an armor sleeve (314), the outer side of the armor sleeve (314) is filled with a gap filler (315), the outer side of the gap filler (315) is installed with an outer sheath (316) at a position inside the protective sleeve (1), the outer curved surface of the inner sheath (307) is provided with an annular groove (317) at a position corresponding to the annular shell (219), the outer curved surface of the outer sheath (313) is provided with an outer groove (318) at a position corresponding to the hollow sleeve (224), the outer curved surface of the temperature lock bag (203) is installed with an elastic strip (320), and the inner curved surface of the inner sheath (307) is provided with a wire groove (319) at a position corresponding to the elastic strip (320).

8. The airtight cold-resistant low-smoke flame-retardant instrument cable for use in an explosive environment according to claim 7, characterized in that: The inner sleeves (301) are distributed in a ring array, and the spacer (201) and the three-sided tube (202) are both matched with the inner sleeve (301), the wire groove (319) is matched with the elastic strip (320), and the elastic strip (320) is spiral.

9. The airtight cold-resistant low-smoke flame-retardant instrument cable for use in an explosive environment according to claim 7, characterized in that: The sealing ring (308) is arranged adjacent to the inner sheath (307), and the gaps between the septum (201), the three-sided tube (202), the temperature-locking bag (203), the conduit (204), the heat-insulating shell (205), the valve body (207), the sleeve (208), the flat box (212), the multi-way tube (214), the thin tube (215) and the inner sheath (301) are all filled with an external filler (309), and the external filler (309), the internal filler (305) and the gap filler (315) are all flame-retardant low-smoke hot-melt adhesive.

10. The airtight cold-resistant low-smoke flame-retardant instrument cable for use in an explosive environment according to claim 7, characterized in that: The inner sheath (301), the fireproof pad (303), the inner sheath (307) and the outer sheath (313) are all polyolefin oxygen barrier materials, the armor sheath (314) is woven from galvanized steel wires, the wrapping tape (312) and the outer sheath (316) are all alkali-free glass fiber tapes, and the insulating sheath (304), the sealing ring (308) and the protective sheath (1) are all cold-resistant halogen-free polymer blends.

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