Glue-sealed cable, cable connector and use method

Abstract

The invention discloses a glue-sealed cable, a cable connector and a use method. Resin is injected into a cavity in a shell of the glue-sealed cable connector; a through hole is formed in the pressing piece, a sealing ring is arranged in the through hole of the pressing piece, and the cable is sleeved with the sealing ring; a baffle is arranged in the shell, the outer side of the baffle is connected with the inner wall of the shell, the baffle is provided with a through hole, and the core wire is sleeved with the baffle. The epoxy resin is injected into the cavity to seal the internal space, so that hazardous gas and dust cannot enter the cavity, the waterproof and airtight performance is achieved, the cable can be generally used in explosive hazardous environments, and in the explosive hazardous environments, if cable damage, cable length insufficiency and cable structure conversion problems occur, the cable can be replaced, and the service life of the cable is prolonged. A large amount of manpower and financial resources are not needed to replace cables or change the process to design the position of mobile equipment, the hidden danger rectification workload of the explosion-proof electric appliance is effectively reduced, the rectification process is simplified, and the rectification capital investment is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of explosion-proof electrical equipment, and in particular relates to a glue-sealed cable, a cable connector and a use method. Background Art

[0002] Explosion-proof electrical equipment is found in many industries such as petroleum, petrochemical, coal, and military industry. It is the cornerstone of safe production and a safety guarantee for the high-quality development of enterprises. Over the years, most companies have generally lacked awareness of explosion-proof electrical equipment and have not paid enough attention to it. Due to long-term management deficiencies, many problems have arisen in the early stages of design, procurement, and installation, which have been brought into the use stage, accumulating a large number of safety hazards. At the same time, because explosion-proof electrical equipment involves multiple professions such as electrical equipment, instrumentation and automatic control, information communication, and lightning protection, it is highly technical and segmented in management. Its problems are also somewhat hidden and lagging, and have gradually become an important obstacle to the safe production of enterprises. Therefore, it is particularly important to manage explosion-proof electrical equipment in the petrochemical industry.

[0003] Failure of explosion-proof electrical equipment is common in many enterprises, which seriously threatens production safety. The national safety supervision of explosion-proof electrical equipment is also increasingly strengthened. During the regular inspection of explosion-proof electrical equipment, it was found that the early stripping of cables during construction, the wrong cable selection or the wrong selection of explosion-proof electrical introduction devices are the main causes of failure of explosion-proof electrical equipment; at the same time, due to the reservation of cables during the rectification process, all cables or distribution boxes must be replaced, resulting in huge rectification funds, large construction workload, long construction period, and difficulty in rectifying hidden dangers. Therefore, a cable connector is urgently needed to solve the current difficulties.

[0004] The patent application with the patent publication number CN202076549U discloses a cable connector sealing structure, including: a housing; a clamping cap, arranged at one end of the housing, and a retaining ring with a diameter smaller than the inner diameter of the clamping cap formed at one end of the housing; an annular sealing plug-in, sleeved on the outer surface of the cable; and an annular clamping plug-in, sleeved on the outer surface of the sealing plug-in, wherein: one end of the housing has a housing connection structure, and the inner wall of the other end of the clamping cap has a clamping cap connection structure suitable for cooperating with the housing connection structure; the inner part of the housing near the one end is formed with a housing convex shoulder; the housing connection structure cooperates with the clamping cap connection structure, the inner wall of the clamping cap compresses the annular clamping plug-in, and one end of the annular sealing plug-in is squeezed by the housing convex shoulder, and the other end of the annular sealing plug-in is squeezed by the retaining ring. Although this patent application can also be used for cable connection, it can only play the role of isolating water vapor from the cable connection, which does not meet the relevant standard requirements of explosion-proof electrical equipment. Therefore, it can only be used as a connection for ordinary electrical equipment and cannot be used in an explosion-hazardous environment. It belongs to non-explosion-proof electrical equipment. Summary of the invention

[0005] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a glue-sealed cable, a cable connector and a method of use, which can realize the connection of the cable and ensure the explosion-proof effect without replacing the cable and the distribution box, effectively reduce the workload of rectification of hidden dangers of explosion-proof electrical appliances, simplify the rectification process, and reduce the capital investment of rectification.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A glue-sealed cable connector, comprising:

[0008] A cable crimping tube, the two ends of which are respectively sleeved outside the connection ends of the two core wires;

[0009] An insulating sleeve, the insulating sleeve being sleeved outside the cable crimping tube;

[0010] A housing, the housing being sheathed on the outside of the cable;

[0011] A pressing piece, the pressing piece is installed at both ends of the shell;

[0012] Among them, the shell has a cavity inside and mounting ports at both ends, and resin is injected into the cavity in the shell; a through hole is provided in the clamping piece, a sealing ring is provided in the through hole of the clamping piece, and the sealing ring is sleeved outside the cable; a baffle is provided in the shell, the outer side of the baffle is connected to the inner wall of the shell, the baffle has a through hole, and the baffle is sleeved outside the core wire.

[0013] Optionally, the baffle is sleeved outside the connecting end of the core wire.

[0014] Optionally, the baffle is an insulating plate.

[0015] Optionally, the insulating sleeve is a heat shrinkable insulating sleeve.

[0016] Optionally, the sealing ring is conical, and the end of the sealing ring with a larger diameter is far away from the connecting end of the core wire.

[0017] The method for using the glue-sealed cable connector comprises the following steps:

[0018] Put two clamping pieces on the two cables respectively;

[0019] Put two sealing rings on the two cables respectively;

[0020] Insert the connecting ends of the two cables into the cavity of the housing;

[0021] pouring resin into the cavity in the shell;

[0022] The pressing piece is installed on the installation opening of the housing, and the installation opening of the housing is sealed by a sealing ring.

[0023] A glue-sealed cable comprises the glue-sealed cable connector.

[0024] Optionally, the rubber-sealed cable comprises two cables, wherein the cable comprises a core wire, and an armor layer is disposed on an outer shell of the core wire, wherein a middle core wire of the cable located in the outer shell is not provided with an armor layer.

[0025] Optionally, a ground wire is externally connected to the armor layer.

[0026] Optionally, the core wire is a five-core wire.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] A glue-sealed cable, cable connector and method of use of the present invention belong to glue-sealed explosion-proof electrical equipment. By using a high-strength shell to provide waterproof and airtight performance, by injecting epoxy resin into the cavity to seal the internal space (including crimping tubes and other components), dangerous gases and dust cannot enter the cavity, and its electrical clearance, creepage distance and pull-out strength can meet the requirements of electrical equipment for explosive hazardous environments, with high safety, suitable for various explosive hazardous environments (coal mine gas environment, gas and dust environment other than coal mine gas environment) and other harsh environments, without considering the selection of hazardous environments, and construction personnel who do not have explosion-proof electrical equipment can operate and use. And the cable connector of the present invention has the characteristics of simple structure, convenient operation, small space occupation, low cost, etc., which can reduce construction time and capital investment, and its comprehensive performance far exceeds similar equipment. In the case of cable damage, insufficient cable length and cable structure conversion problems in an explosive hazardous environment, there is no need to spend a lot of manpower and financial resources to break ground to replace the cable or change the position of the process design mobile equipment, which effectively reduces the workload of rectification of hidden dangers of explosion-proof electrical appliances, simplifies the rectification process, and reduces the rectification capital investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are for explanation purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0030] Figure 1 It is a cross-sectional schematic diagram of the present invention;

[0031] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0032] Figure 3It is a schematic diagram of the sealing ring of the present invention;

[0033] Figure 4 It is a schematic diagram of the pressing member of the present invention;

[0034] Figure 5 It is a schematic diagram of the crimping tube fixing device of the present invention;

[0035] Among them, 1-cable, 11-core wire, 12-connection point, 13-outer insulation layer, 14-armor layer, 2-insulating sleeve, 3-cable crimping tube, 31-crimping tube fixing device, 4-housing, 5-clamping piece, 51-clamping cover, 52-clamping boss, 6-sealing ring, 7-resin, 8-ground wire. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0037] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0039] The present invention is described in detail below with reference to the accompanying drawings.

[0040] like Figure 1 and Figure 2As shown, a rubber-sealed cable of the present invention comprises a rubber-sealed cable connector and two cables 1, wherein the cable 1 comprises a core wire 11, and the core wire 11 is provided with an armor layer 14 on its outer cover, wherein the middle core wire 12 of the cable 1 located in the outer cover 4 is not provided with an armor layer 14. The armor layer 14 is externally connected to a ground wire 8; specifically, the core wire 11 is a five-core wire.

[0041] The rubber-sealed cable connector includes: a cable crimping tube 3, an insulating sleeve 2, an outer shell 4 and a clamping piece 5. The two ends of the cable crimping tube 3 are respectively sleeved outside the connection ends 12 of the two core wires 11; the insulating sleeve 2 is sleeved outside the cable crimping tube 3; the outer shell 4 is sleeved outside the cable 1; the clamping piece 5 is installed at both ends of the outer shell 4. The outer shell 4 has a cavity inside and mounting openings at both ends. Specifically, the outer shell 4 is a hollow cylinder, and the two ends of the outer shell 4 have threads. A through hole is provided in the clamping piece 5, and the clamping piece 5 has threads matching the outer shell 4.

[0042] The cavity in the shell 4 is filled with resin 7, which can play a role in explosion-proofing. A sealing ring 6 is arranged in the through hole of the pressing member 5, and the sealing ring 6 is sleeved outside the cable 1; a baffle is arranged in the shell 4, the outer side of the baffle is connected to the inner wall of the shell 4, the baffle has a through hole, and the baffle is sleeved outside the core wire 11.

[0043] Specifically, the thread of the housing 4 is a G thread (flameproof thread), which can effectively isolate flammable and explosive media, thereby avoiding equipment explosion, and the flameproof thread has good fire resistance and corrosion resistance, and can work in high temperature environment and acid-base medium environment. The thread of the housing 4 is not less than six buckles, and the spacing of the composite is 1mm. The composite is a sealing ring (silicone gasket). According to the explosion-proof standard, when the cable passes through the sealing ring, the gap is required to be between ±1mm. In order to ensure that the cable can easily pass through the sealing ring and to achieve a compression sealing effect to play a ring isolation sealing role, the spacing is required to be 1mm.

[0044] Specifically, the cable 4 is made of cast aluminum. Specifically, the shell 4 has a thickness of 1.5 mm.

[0045] Specifically, the clamping member 5 includes a clamping cover 51, which is a circular plate. A clamping boss 52 is provided in the middle of the clamping cover 51. The clamping boss 52 is annular. The clamping cover 51 has threads on the outside, wherein the threads on the clamping cover 51 have a 5mm smooth surface for placing the sealing ring 6. A locking bolt is provided in the clamping boss 52. The locking bolt is axially designed and its function is to tighten the bolt. The clamping cover 51 compresses the sealing ring 6 to produce deformation, so that the sealing ring 6 clamps the cable 1, which can preferentially fix the glue-sealed cable connector at the cable connection, and can prevent water from flowing into the glue-sealed cable connector in a humid environment, so that the glue seal in the housing 4 is effective and reliable.

[0046] Optionally, the insulating sleeve 2 is a heat shrinkable insulating sleeve.

[0047] Optionally, the sealing ring 6 is a silicone gasket.

[0048] Preferably, the baffle is sleeved outside the connecting end 12 of the core wire 11 .

[0049] Preferably, the baffle is an insulating plate.

[0050] Preferably, the sealing ring 6 is conical, and the end of the sealing ring 6 with a larger diameter is far away from the connecting end 12 of the core wire 11. This can prevent gas from entering and achieve a good sealing effect.

[0051] Preferably, a filling hole is provided on the housing 4, the filling hole has threads, and a blocking bolt is installed in the filling hole.

[0052] During internal welding, the crimping tube fixing device 31 can be inserted to fix the cable crimping tube 3. Specifically, the crimping tube fixing device 31 is a multi-petal insulation plate, the multi-petal insulation plate is made of insulating material, and the outer edge of the multi-petal insulation plate is provided with a crimping tube fixing groove. Multiple cable crimping tubes 3 are separated by the multi-petal insulation plate, which can meet the electrical clearance and creepage distance between the crimping tubes.

[0053] A glue-sealed cable connector of the present invention, when used, comprises the following steps:

[0054] Put two pressing pieces 5 on the two cables 1 respectively;

[0055] Put two sealing rings 6 on the two cables 1 respectively;

[0056] Extend the connection ends 12 of the two cables 1 into the cavity of the housing 4;

[0057] When applied to armored cables, the outer sheath of the cable needs to be stripped to expose 1 cm of the armor layer, and the armor layers 14 at both ends are connected using a clamp and an armor layer connecting wire; the clamp is sheet-shaped, annular, and bolted, and is placed on the armor layer 14. The armor layer connecting wire is placed between the armor layer 14 and the clamp, and the clamp bolt is tightened to reliably crimp the armor layer connecting wire. The clamp 5 is installed on the installation port of the housing 4, and the installation port of the housing 4 is sealed by the sealing ring 6.

[0058] The resin 7 is poured into the cavity in the housing 4 through the pouring hole; and the pouring hole is sealed by the sealing bolt.

[0059] During the regular inspection and examination of explosion-proof electrical equipment, it was found that the early stripping of cables, wrong cable selection or wrong selection of explosion-proof electrical lead-in devices during construction were the main reasons for the failure of explosion-proof electrical equipment; at the same time, during the rectification process, the rectification was difficult or impossible due to insufficient cable length or cable reservation; thus, it caused huge rectification funds, large construction workload, long construction period, and difficulty in rectifying hidden dangers. Therefore, a device is urgently needed to solve the above difficulties in the current enterprise rectification process.

[0060] After many in-depth investigations on production sites and hidden danger rectification sites and inquiries on standards and specifications, the present invention has found that electrical equipment used in explosion-hazardous areas must comply with the requirements of the GB3836 series of standards to play an explosion-proof role.

[0061] Through research, it is found that the rubber-sealed cable connector is suitable for connecting various cables, including different forms of armored cables and unarmored cables. It can be used in explosive hazardous environments, does not require fixing, has a long service life, is economical, safe and reliable.

[0062] The present invention can realize the connection of cables and ensure the explosion-proof effect without replacing the cables, effectively reducing the workload of rectification, simplifying the rectification process, and reducing the capital investment of rectification. At the same time, after research, it was determined that the outer shell 4 is cylindrical, made of cast aluminum, and the filler material is epoxy resin. Through the clamp 5 and the sealing ring 6 through the two cables 1 respectively, the core wire 11 is connected using the cable crimping tube 3; the armor layers 14 at both ends are linked using a clamp and an armor layer connecting wire, the cable crimping tube 3 and the armor layer connecting wire are fixed on the crimping tube fixing device 31, the baffle is installed, the clamp 5 is tightened, and the outer shell 14 is then filled and sealed. It can be used after standing. The cable connector of this invention adopts a glue-sealed form, which has powerful performance, safety and reliability, a wide range of application areas (especially suitable for explosive hazardous environments) and a cable connector that is easy to install. It can achieve dust-tightness level, and there is no need to consider problems with the line caused by dust and water entering the equipment.

[0063] Unless otherwise specified, the device elements involved in the above embodiments are all conventional device elements, and the structural settings, working modes or control modes involved are all conventional settings, working modes or control modes in the art unless otherwise specified.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A rubber-sealed cable connector, characterized in that: include: A cable crimping tube (3), the two ends of which are respectively sleeved outside the connection ends (12) of the two core wires (11); An insulating sleeve (2), wherein the insulating sleeve (2) is sleeved outside the cable crimping tube (3); A housing (4), wherein the housing (4) is sleeved on the outside of the cable (1); A pressing piece (5), wherein the pressing piece (5) is installed at both ends of the housing (4); The shell (4) has a cavity inside and mounting openings at both ends, and the cavity in the shell (4) is filled with resin (7); a through hole is provided in the clamping member (5), a sealing ring (6) is provided in the through hole of the clamping member (5), and the sealing ring (6) is sleeved outside the cable (1); a baffle is provided in the shell (4), the outer side of the baffle is connected to the inner wall of the shell (4), the baffle has a through hole, and the baffle is sleeved outside the core wire (11).

2. A glue-sealed cable connector according to claim 1, characterized in that: The baffle is sleeved outside the connecting end (12) of the core wire (11).

3. The adhesive-sealed cable connector according to claim 1, characterized in that: The baffle is an insulating plate.

4. The adhesive-sealed cable connector according to claim 1, characterized in that: The insulating sleeve (2) is a heat shrinkable insulating sleeve.

5. The adhesive-sealed cable connector according to claim 1, characterized in that: The sealing ring (6) is conical, and the end of the sealing ring (6) with a larger diameter is far away from the connection end (12) of the core wire (11).

6. A method for using a glue-sealed cable connector according to any one of claims 1 to 5, characterized in that: The following steps are involved: Put two pressing pieces (5) on the two cables (1) respectively; Put two sealing rings (6) on the two cables (1) respectively; Insert the connection ends (12) of the two cables (1) into the cavity of the housing (4); Infusing the cavity in the housing (4) with resin (7); The pressing piece (5) is installed on the installation opening of the housing (4), and the installation opening of the housing (4) is sealed by a sealing ring (6).

7. A rubber-sealed cable, characterized in that: A glue-sealed cable connector comprising any one of claims 1-5.

8. A glue-sealed cable according to claim 7, characterized in that: The invention comprises two cables (1), wherein the cable (1) comprises a core wire (11), the core wire (11) is provided with an armor layer (14) on its outer shell, wherein a middle core wire (12) of the cable (1) located in the outer shell (4) is not provided with an armor layer (14).

9. A glue-sealed cable according to claim 8, characterized in that: The armor layer (14) is externally connected to a ground wire (8).

10. A glue-sealed cable according to claim 7, characterized in that: The core wire (11) is a five-core wire.

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