Explosion-proof flexible connection tube

Abstract

This utility model relates to the field of explosion-proof technology and discloses an explosion-proof flexible connecting pipe, including a corrugated pipe and an inner liner. The circumferential side of the inner liner is stepped. The corrugated pipe covers the connecting pipe, and the inner liner is inserted into both ends of the corrugated pipe. The inner liner is fitted with an outer sleeve for fixing the connecting pipe. The ends of the inner liner away from the corrugated pipe are fitted with explosion-proof threads. One explosion-proof thread is screwed to an external threaded connector, and the other explosion-proof thread is screwed to an internal threaded connector. This utility model simplifies the structure by directly connecting the two end connectors (external threaded connector and internal threaded connector) with the explosion-proof threads on the inner liner, ensuring usage requirements while reducing assembly difficulty and manufacturing costs. In addition, the composite layer connecting pipe, outer sleeve, and anti-detachment ring structure can enhance reliability. The overall solution achieves lightweight and high reliability while ensuring explosion-proof performance.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof technology, specifically to explosion-proof flexible connecting pipes. Background Technology

[0002] Explosion-proof flexible conduit is a flexible connection device designed specifically for explosive gas / dust environments. As a flexible connection for the incoming and outgoing lines of explosion-proof electrical appliances (such as distribution boxes and junction boxes), it solves the problems of difficult bending of steel pipe wiring and installation at vibration or expansion joints. It is widely used in dangerous places such as petroleum, chemical, and coal mines.

[0003] The explosion-proof flexible connectors currently in use have a shoulder on their inner liner. The connector is fixed at the shoulder by tightening the nut and the connector on one side, along with a gasket, to ensure connection strength. Although the manufacturing requirements for the thread are low, it increases the number of parts, thereby increasing the manufacturing cycle, assembly workload, and manufacturing cost.

[0004] Therefore, there is an urgent need for an explosion-proof flexible connection pipe that is simple in structure, easy to assemble, and safe and reliable. Utility Model Content

[0005] The purpose of this invention is to provide an explosion-proof flexible connecting pipe that simplifies the structure while meeting usage requirements, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An explosion-proof flexible connecting pipe includes a corrugated pipe and an inner liner. The circumferential side of the inner liner is stepped. The corrugated pipe covers the connecting pipe. The inner liner is inserted into both ends of the corrugated pipe. The inner liner is fitted with an outer sleeve for fixing the connecting pipe. The end of the inner liner away from the corrugated pipe is fitted with an explosion-proof thread. One explosion-proof thread is screwed with an external threaded connector, and the other explosion-proof thread is screwed with an internal threaded connector.

[0007] Specifically, anti-detachment rings are evenly provided at both ends of the circumferential side of the connecting pipe, and anti-detachment grooves matching the anti-detachment rings are provided on the inner circumferential side of the outer sleeve.

[0008] Furthermore, the anti-detachment ring has a wedge-shaped cross-section, and the width of the end of the wedge near the bellows is greater than the width of the end of the wedge away from the bellows.

[0009] Specifically, the connecting pipe is composed of an inner rubber tube, a middle steel wire braided mesh, and an outer plastic tube.

[0010] Specifically, the external threaded connector and the internal threaded connector are respectively pressed with gaskets between them and the inner liner tube at the same end.

[0011] Specifically, the end of the inner liner tube near the bellows tube has a taper.

[0012] Specifically, a sealing ring is fitted around the circumference of the external threaded connector.

[0013] Specifically, the external threaded connector is screwed with a protective sleeve.

[0014] Compared with the prior art, the beneficial effects of this utility model are: The structure is simplified by directly connecting the two end joints (external thread joint and internal thread joint) with the explosion-proof thread set on the inner liner tube, which ensures the use requirements while reducing the number of parts, assembly difficulty and manufacturing cost. In addition, the composite layer connecting pipe, outer sleeve and anti-detachment ring and other structures can enhance reliability; The overall solution achieves lightweight and high reliability while ensuring explosion-proof performance. Attached Figure Description

[0015] Figure 1 This is a schematic half-sectional view of the structure of this utility model; Figure 2 for Figure 1 Enlarged view of the structure at point a.

[0016] In the diagram: 1. External threaded connector, 2. Gasket, 3. Inner liner, 4. Outer sleeve, 6. Connecting pipe, 7. Bellows, 8. Internal threaded connector, 9. Sealing ring, 10. Sheath, 11. Anti-detachment ring. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Example: Please see Figure 1 This utility model provides an explosion-proof flexible connecting pipe, including a corrugated pipe 7 and an inner liner 3. The circumferential side of the inner liner 3 is stepped. The corrugated pipe 7 covers the connecting pipe 6. The inner liner 3 is inserted into both ends of the corrugated pipe 7. The inner liner 3 is fitted with an outer sleeve 4 for fixing the connecting pipe 6.

[0019] The inner liner 3 is made of stainless steel to ensure strength and corrosion resistance. The corrugated pipe 7 is flexible and resistant to mechanical impact. The connecting pipe 6 can be integrally molded and wrapped around the corrugated pipe 7 to enhance toughness and sealing while also providing isolation and protection. The outer sleeve 4 can fix the ends of the connecting pipe 6 and the corrugated pipe 7 to the inner liner 3.

[0020] The outer sleeve 4 is made of stainless steel and can be securely fastened to the inner liner 3 and connecting pipe 6 using a crimping machine.

[0021] The ends of the inner liner tube 3 away from the bellows tube 7 are all fitted with explosion-proof threads. The explosion-proof threads must pass the non-explosion transmission test, fit tightly without gaps, and prevent friction heat or sparks from being generated. The effective number of engagement threads of the explosion-proof threads shall not be less than 5, the screwing depth shall not be less than 8 mm, and the metric thread (M) shall be used with a tolerance grade ≥6g / 6H.

[0022] One of the explosion-proof threads is screwed with an external threaded connector 1, and the other explosion-proof thread is screwed with an internal threaded connector 8. The external threaded connector 1 is used to connect with the threaded hole of the external equipment, and the internal threaded connector 8 is used to connect with the threaded pipe of the external equipment. In addition, the specifications of the external threaded connector 1 and the internal threaded connector 8 are compatible, which can realize the series use of multiple explosion-proof flexible connecting pipes connected end to end.

[0023] Both the external threaded connector 1 and the internal threaded connector 8 have hexagonal steel structures on their circumferential sides to facilitate the application of torque by a wrench for rotation.

[0024] Please see Figure 2 The structure of the anti-detachment ring 11: Anti-detachment rings 11 are evenly arranged at both ends of the circumference of the connecting pipe 6, with 6 to 8 anti-detachment rings 11 at each end. The inner circumference of the outer sleeve 4 is provided with anti-detachment grooves that match the anti-detachment rings 11. After the outer sleeve 4 is pressed, the anti-detachment grooves and anti-detachment rings 11 are fully engaged to form a mechanical interlock, which can improve the axial force-bearing capacity of the connecting pipe 6 and ensure the connection strength between the inner liner 3 and the connecting pipe 6. Especially when subjected to dynamic loads at the moment of explosion, it can prevent gas / dust intrusion caused by connection failure.

[0025] In addition, the anti-detachment ring 11 has a wedge-shaped cross-section, and the width of the end of the wedge near the bellows 7 is greater than the width of the end of the wedge away from the bellows 7. The anti-detachment ring 11 with a wedge-shaped cross-section can further enhance the connection strength between the inner liner pipe 3 and the connecting pipe 6 and prevent separation.

[0026] The connecting pipe 6 is composed of an inner rubber tube (providing insulation and cushioning), a middle steel wire braided mesh (enhancing compressive and tensile strength), and an outer plastic tube (for weather resistance and corrosion resistance). This composite structure makes the overall performance of the connecting pipe 6 more robust.

[0027] The external threaded connector 1 and the internal threaded connector 8 are respectively pressed between the gasket 2 and the inner liner tube 3 at the same end to form an end face seal, preventing flammable media from leaking along the thread gap.

[0028] The end of the inner liner 3 near the bellows 7 is tapered, which makes it easy for the inner liner 3 to be smoothly inserted into the bellows 7 during assembly.

[0029] The external threaded connector 1 is fitted with a sealing ring 9 on its circumferential side to enhance the sealing performance after docking with the equipment interface.

[0030] The external threaded connector 1 is screwed with a sheath 10, which protects the external threaded connector 1 from physical damage and environmental corrosion when it is not in use.

[0031] Working principle: The connecting pipe 6 and the corrugated pipe 7 are prefabricated for later use. During assembly, the inner liner 3 is inserted into both ends of the corrugated pipe 7, the outer sleeve 4 is fitted and the anti-detachment groove and anti-detachment ring 11 are aligned. The outer sleeve 4 can be firmly fastened to the inner liner 3 by a crimping machine to press the ends of the connecting pipe 6 and the corrugated pipe 7, thus completing the main assembly. Then, install the gasket 2, external threaded connector 1, and internal threaded connector 8 on the explosion-proof thread in sequence and tighten them securely. Finally, install the sealing ring 9 and the protective sleeve 10, making the assembly simpler and more convenient.

[0032] When using it on site, remove the protective sleeve 10 and connect and install the external threaded connector 1 and the internal threaded connector 8 respectively.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An explosion-proof flexible connecting pipe, characterized in that: It includes a corrugated pipe (7) and an inner liner (3). The circumferential side of the inner liner (3) is stepped. The corrugated pipe (7) is covered with a connecting pipe (6). The inner liner (3) is inserted into both ends of the corrugated pipe (7). The inner liner (3) is fitted with an outer sleeve (4) for fixing the connecting pipe (6). The end of the inner liner (3) away from the corrugated pipe (7) is fitted with an explosion-proof thread, one of which is screwed with an external threaded connector (1), and the other is screwed with an internal threaded connector (8).

2. The explosion-proof flexible connector according to claim 1, characterized in that: The connecting pipe (6) has anti-detachment rings (11) evenly arranged at both ends of its circumference, and the outer sleeve (4) has anti-detachment grooves that match the anti-detachment rings (11) on its inner circumference.

3. The explosion-proof flexible connector according to claim 2, characterized in that: The anti-detachment ring (11) has a wedge-shaped cross section, and the width of the end of the wedge near the bellows (7) is greater than the width of the end of the wedge away from the bellows (7).

4. The explosion-proof flexible connector according to claim 1, characterized in that: The connecting pipe (6) is composed of an inner rubber tube, a middle steel wire braided mesh, and an outer plastic tube.

5. The explosion-proof flexible connector according to claim 1, characterized in that: The external threaded connector (1) and the internal threaded connector (8) are respectively pressed with a gasket (2) between them and the inner liner (3) at the same end.

6. The explosion-proof flexible connector according to claim 1, characterized in that: The end of the inner liner (3) near the bellows (7) has a taper.

7. The explosion-proof flexible connector according to claim 1, characterized in that: The external threaded connector (1) is fitted with a sealing ring (9) on its circumferential side.

8. The explosion-proof flexible connector according to claim 1, characterized in that: The external threaded connector (1) is screwed with a sheath (10).

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