An internally waterproofed explosion-proof flexible hose

Abstract

This utility model discloses an internally waterproof explosion-proof flexible hose, belonging to the technical field of explosion-proof electrical equipment. The hose includes a sealing assembly, a main body, and externally and internally threaded pipe joints located at both ends of the main body. The sealing assembly includes a conical sealing ring, a push rod, and a locking element. The conical sealing ring has an open large end and a small end on both sides, with the large end abutting against the inner wall of the main body. The push rod is located near the small end and above the inclined portion of the conical sealing ring, with external threads on its outer circumference. The main body has an internally threaded through groove that mates with it. By rotating the push rod, the conical sealing ring can be compressed and deformed, fitting seamlessly with the external cable. The locking element is installed on the push rod for vertical locking and limiting. This utility model can quickly seal the pipeline after the wiring operation is completed, effectively preventing the intrusion of liquids and dust, thereby ensuring that the hose can operate safely, stably, and reliably in explosive environments, fully meeting the protection needs of various industrial scenarios.

Description

Technical Field

[0001] This utility model relates to an internally waterproof explosion-proof flexible hose, belonging to the technical field of explosion-proof electrical equipment. Background Technology

[0002] In industrial sectors involving hazardous environments such as flammable and explosive gases and dust, explosion-proof flexible hoses serve as crucial components for electrical wiring connections and protection, bearing the important responsibility of isolating hazardous environments and ensuring the safe operation of electrical systems. Currently, mainstream explosion-proof flexible hose designs generally employ a sealing structure with fixed connectors at both ends and sealing rings, aiming to achieve effective sealing between the hose and the cable. However, in practical applications, especially during wiring operations, this design has revealed some significant problems:

[0003] Specifically, when cables pass through traditional explosion-proof flexible conduits, a perfect match between the cable diameter and the conduit's inner diameter is difficult to achieve, inevitably resulting in gaps between the cable and the conduit's inner wall. These gaps make it difficult to achieve comprehensive waterproofing and dustproofing solely through the clamping action of the connectors on the conduit's end. In humid or dusty working environments, moisture and dust can easily penetrate the conduit through these gaps, causing corrosion or short-circuit risks to electrical components, thus affecting the safety and reliability of the entire system.

[0004] Furthermore, to compensate for the shortcomings of traditional designs in sealing performance, on-site operators often need to take additional sealing measures, such as applying sealant or installing plugs. These operations not only increase the number of steps and time costs, reducing work efficiency, but in some cases, they may also damage the original structural strength of the hose, affecting its service life and explosion-proof performance. More importantly, as a core component ensuring the explosion-proof performance of the hose, the explosion-proof connector requires extremely high processing precision, especially the control of the explosion-proof gap, which must strictly comply with relevant standards. However, during the wiring process, the repeated disassembly and assembly of the connector and subsequent sealing treatment often lead to wear on the connector surface, which in turn affects the accuracy of the explosion-proof gap and may even cause a decline in explosion-proof performance, posing a potential threat to the safe operation of the entire system.

[0005] Therefore, it is particularly important to develop a new and efficient explosion-proof flexible hose to address the problems of insufficient sealing, cumbersome operation, and the conflict between explosion-proof performance and sealing performance in existing explosion-proof flexible hoses in scenarios such as wiring. Utility Model Content

[0006] The purpose of this invention is to provide an internally waterproof explosion-proof flexible hose, which aims to solve the problem that traditional flexible hoses cannot simultaneously achieve internal waterproof and explosion-proof performance under complex working conditions. This allows the hose to quickly seal the pipeline after wiring, effectively preventing liquids and dust from entering, while ensuring safe and reliable operation in explosive environments.

[0007] To solve the above-mentioned technical problems, this utility model is implemented using the following technical solution:

[0008] This utility model provides an internally waterproof explosion-proof flexible hose, which includes: a sealing assembly, a main body, and external threaded pipe joints and internal threaded pipe joints disposed at both ends of the main body; the sealing assembly includes: a conical sealing ring, a push rod, and a locking element;

[0009] The conical sealing ring has a large opening and a small opening on each side for the external cable to pass through; the large opening abuts against the inner wall of the main body; the push rod is close to the small opening and located above the inclined part of the conical sealing ring.

[0010] The outer circumference of the push rod is provided with an external thread, and the main body is provided with an internal thread through groove that mates with the push rod. This is used to squeeze one end of the push rod against the conical sealing ring through a vertical rotation, thereby causing the conical sealing ring to deform and achieve a gapless fit with the external cable.

[0011] The locking element is installed on the push rod and is used to lock and limit the push rod in the vertical direction.

[0012] Optionally, the main body includes: an inner main body, a middle main body, and an outer main body arranged sequentially from the inside to the outside.

[0013] Optionally, the external thread on the outer periphery of the push rod is an M12×1 fine thread.

[0014] Optionally, the locking element is a locking nut, and at least two locking nuts are provided.

[0015] Optionally, the external threaded pipe fitting is also provided with a sealing ring.

[0016] Optionally, the length of the main body is set to 100cm.

[0017] Optionally, the inner wall diameter of the main body is set to 25 mm.

[0018] Optionally, the temperature resistance range of the conical sealing ring is -40℃ to 200℃.

[0019] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0020] During the compression sealing process, the innovatively added conical sealing ring of this invention mainly undergoes radial deformation, with no displacement of the explosion-proof mating surface, ensuring that the explosion-proof performance is not affected and meeting the Ex d / IIC level explosion-proof requirements. Simultaneously, this invention uses a rotating push rod to compress the conical sealing plug, causing it to deform and tightly adhere to the cable, achieving a gapless internal seal, meeting the IP68 protection level, and effectively preventing liquids and dust from entering the hose. Furthermore, this invention only requires rotating the push rod to complete the sealing operation inside the hose, with an operating torque ≤2 N·m, making operation simple and fast, greatly improving work efficiency. Attached Figure Description

[0021] Figure 1 The diagram shown is a structural schematic of the explosion-proof flexible hose with internal waterproofing of this utility model.

[0022] In the diagram: 1-Main pipe body; 2-External threaded pipe fitting; 3-Internal threaded pipe fitting; 4-Conical sealing ring; 5-Propeller rod; 6-Locking element; 7-Large opening end; 8-Small opening end; 9-Sealing ring. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0024] Example 1

[0025] This embodiment introduces an internally waterproof explosion-proof flexible hose, which includes: a sealing assembly, a main body 1, and externally threaded pipe fittings 2 and internally threaded pipe fittings 3 disposed at both ends of the main body 1. The length of the main body 1 is 100cm; the inner diameter of the main body 1 is 25mm.

[0026] The sealing assembly includes a sealing ring 9, a conical sealing ring 4, a push rod 5, and a locking element 6. The sealing ring 9 is installed on the external threaded pipe joint 2 to ensure the sealing performance at the joint of the two pipe joints. The conical sealing ring 4 has a large opening 7 and a small opening 8 on its two sides for the external cable to pass through. The large opening 7 abuts against the inner wall of the main body 1; the push rod 5 is located near the small opening 8 and above the inclined portion of the conical sealing ring 4. The push rod 5 has an external thread (M12×1 fine thread) on its outer circumference, and the main body 1 has an internal threaded groove that mates with the push rod 5. This groove allows the push rod 5 to be rotated vertically, pressing one end against the conical sealing ring 4, thereby deforming the conical sealing ring 4 and achieving a gapless fit with the external cable. The locking element 6 is installed on the push rod 5 to lock and limit its vertical movement.

[0027] In practical applications, the internally waterproof explosion-proof flexible hose described in this embodiment, during the process of threading the external cable into the main body 1, is in a non-compressed state without being squeezed. Its large opening end 7 abuts against the inner wall surface of the main body 1, and there is a gap between the small opening end 8 and the external cable, which does not hinder the cable from being threaded in. At the same time, the sealing ring 9 is installed on the external threaded pipe joint, ensuring that the connection between the two pipe joints has basic sealing performance during the threading stage. Moreover, the explosion-proof parameters of the joint will not be changed throughout the threading process, and the explosion-proof joint surface will not be displaced, ensuring that the explosion-proof performance is not affected.

[0028] Once the cable is inserted, the sealing operation begins. By rotating the push rod 5, which has an M12×1 fine thread on its outer circumference, the rotational motion is converted into a vertical linear motion through a groove on the main body 1. One end of the push rod 5 gradually compresses the conical sealing ring 4. Because the conical sealing ring 4 has a large opening 7 and a small opening 8 on its two sides for the external cable to pass through, the conical sealing ring 4 deforms under the pressure of the push rod 5. Especially on the small opening 8 side, the radial deformation allows for a seamless fit with the external cable, achieving a good internal waterproof seal.

[0029] After the push rod 5 is rotated to the appropriate position so that the conical sealing ring 4 and the external cable achieve the ideal sealing state, the locking component installed on the push rod 5 plays its role, locking and limiting the push rod 5 in the vertical direction to prevent the push rod 5 from moving due to external forces or other factors, which would cause the sealing effect of the conical sealing ring 4 to deteriorate. This ensures that the entire explosion-proof flexible hose can maintain its internal waterproof and explosion-proof performance for a long time in actual applications, meet the usage requirements in different environments, and protect the safety of equipment and personnel.

[0030] Example 2

[0031] refer to Figure 1 Based on Example 1, this example also has the following design:

[0032] To meet the high requirements for the overall performance of the main pipe under complex working conditions, the main pipe 1 (corrugated pipe body) is provided with three layers of different materials from the inside to the outside, namely the inner main pipe, the middle main pipe and the outer main pipe.

[0033] Specifically, the inner main body adopts a double-layer stainless steel braided structure. Stainless steel itself has high strength and corrosion resistance, and the double-layer braiding process further enhances its mechanical strength and flexibility. This structure can not only withstand the pressure and tension generated during the internal medium transmission process, effectively preventing the main body from deforming or breaking due to stress, but also adapt to a certain degree of bending and torsion, meeting the needs of different installation environments.

[0034] The middle main body is made of oil-resistant rubber. In practical applications, the main body may come into contact with various oily media. Oil-resistant rubber has excellent oil resistance, preventing oily substances from penetrating into the interior of the main body and avoiding corrosion and damage to the internal structure. At the same time, oil-resistant rubber also has a certain degree of elasticity and sealing properties, which can fill the tiny gaps between the double-layer stainless steel braided structure, enhance the overall sealing of the main body, and prevent media leakage.

[0035] The outer main body is made of flame-retardant polyurethane. In many work environments, there are safety hazards such as fires. Flame-retardant polyurethane has excellent flame-retardant properties, effectively preventing the spread of flames and reducing the damage to the main body and its internal transmission medium, thus ensuring the safety of equipment and personnel. Furthermore, flame-retardant polyurethane also has advantages such as wear resistance and anti-aging properties, protecting the internal structure from wear and erosion by the external environment and extending the service life of the main body.

[0036] In this embodiment, the locking element 6 is specifically a locking nut, and at least two locking nuts are provided. One or more nuts are installed on the push rod 5 near the target height position. When the push rod 5 rotates to the target height, the nuts are tightened so that the nuts are in close contact with the outer wall of the main body 1. The friction between the nuts and the main body 1 prevents the rotation and axial movement of the push rod, thereby achieving locking.

[0037] The conical sealing ring 4 is made of fluororubber, and the temperature resistance range of this fluororubber is -40℃ to 200℃. In terms of temperature resistance, the conical sealing ring 4 maintains stable performance over a wide temperature range. At a low temperature of -40℃, it still maintains a certain degree of elasticity and sealing performance, and will not harden or become brittle due to the low temperature, leading to sealing failure. At a high temperature of 200℃, it can also function normally without softening or decomposition, thus ensuring the sealing effect.

[0038] During the preparation phase, loosen the external threaded pipe joint 2 and the internal threaded pipe joint 3, and rotate the push rod 5 to above the conical sealing ring 4, keeping one end of the push rod 5 from contacting the inclined part of the conical sealing ring 4.

[0039] During the cable threading stage, the conical sealing ring 4 is in an uncompressed state. At this time, there is a gap between its small open end 8 and the external cable, preventing direct contact and thus avoiding obstruction of cable threading. This design allows for smooth threading without the need for additional tools or complex steps to overcome the resistance of the sealing ring. Furthermore, the compression of the conical sealing ring 4 is adjustable, making it compatible with external cables having a diameter difference of ±15%.

[0040] During the sealing stage, rotating the push rod 5 applies radial compressive force to the conical sealing ring 4, causing radial deformation of the small opening end 8 on one side of the conical sealing ring 4. As the push rod 5 continues to rotate, the compressive force gradually increases, and the degree of deformation of the conical sealing ring 4 also increases, eventually forming a tight seal with the external cable. Throughout the entire compression deformation process, the explosion-proof mating surface does not shift. This is because the deformation of the conical sealing ring 4 is primarily radial and does not affect the relative positions of other components of the connector, thus ensuring the integrity of the explosion-proof mating surface and its explosion-proof performance.

[0041] Furthermore, since the conical sealing ring 4 undergoes primarily elastic deformation during the deformation process, when it is necessary to disassemble or replace the cable, the conical sealing ring 4 can be restored to its original shape by rotating the push rod 5 in the opposite direction, thus enabling reuse and extending the service life of the sealing ring.

[0042] In the description of this utility model disclosure / application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to explain the relative positional relationship and movement between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. These terms are used only for the convenience of describing this utility model disclosure / application and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this utility model disclosure / application.

[0043] In the description of this utility model disclosure / application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model disclosure / application based on the specific circumstances. Furthermore, in the description of this embodiment, unless otherwise stated, "a plurality of" means two or more.

[0044] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An internally water-proof, explosion-proof flexible hose, characterized by, include: A sealing assembly, a main body (1), and external threaded pipe fittings (2) and internal threaded pipe fittings (3) disposed at both ends of the main body (1); the sealing assembly includes: a conical sealing ring (4), a push rod (5), and a locking element (6); The conical sealing ring (4) is provided with a large opening end (7) and a small opening end (8) on both sides for passing through external cables; the large opening end (7) abuts against the inner wall surface of the main body (1); the push rod (5) is close to the small opening end (8) and located above the inclined part of the conical sealing ring (4). The outer periphery of the push rod (5) is provided with an external thread, and the main body (1) is provided with an internal thread through groove that cooperates with the push rod (5). This is used to squeeze one end of the push rod (5) against the conical sealing ring (4) by rotating in the vertical direction, thereby causing the conical sealing ring (4) to deform and fit seamlessly with the external cable. The locking element (6) is installed on the push rod (5) and is used to lock and limit the push rod (5) in the vertical direction.

2. The internally waterproof explosion-proof flexible hose according to claim 1, characterized in that, The main body (1) includes: an inner main body, a middle main body and an outer main body arranged sequentially from the inside to the outside.

3. The internally waterproof explosion-proof flexible hose according to claim 1, characterized in that, The external thread on the outer periphery of the push rod (5) is an M12×1 fine thread.

4. The internally waterproof explosion-proof flexible hose according to claim 1, characterized in that, The locking element (6) is a locking nut, and at least two locking nuts are provided.

5. The internally waterproof explosion-proof flexible hose according to claim 1, characterized in that, The external threaded pipe fitting (2) is also provided with a sealing ring (9).

6. The internally waterproof explosion-proof flexible hose according to claim 1, characterized in that, The length of the main body (1) is set to 100cm.

7. The internally waterproof explosion-proof flexible hose according to claim 1, characterized in that, The inner wall diameter of the main body (1) is set to 25 mm.

8. The internally waterproof explosion-proof flexible hose according to claim 1, characterized in that, The temperature range of the conical sealing ring (4) is -40℃ to 200℃.

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