Stainless steel anti-explosion flexible connecting pipe

Abstract

The utility model relates to a stainless steel anti-explosion flexible connecting pipe which comprises a pipe body and a connector arranged at the end of the pipe body. The connector comprises a first connecting ring, an extrusion piece arranged on the first connecting ring and a second connecting ring arranged on the extrusion piece; inner conical surfaces are arranged on the inner side walls of the first connecting ring and the second connecting ring, the extrusion part comprises a connecting pipe and an extrusion plate rotationally connected to the inner side wall of the connecting pipe, the extrusion plate is used for being matched with the inner conical surfaces, and outer threads are arranged on the first connecting ring and the second connecting ring; the two ends of the connecting pipe are provided with internal threads matched with the external threads. The cable connecting structure has the effects of reducing the cable connecting bearing capacity and reasonably distributing the cable bearing weight.

Description

Technical Field

[0001] The present application relates to the field of pipe connection equipment, and in particular to a stainless steel explosion-proof flexible connecting pipe. Background Art

[0002] Explosion-proof flexible connecting pipe, also known as explosion-proof flexible pipe, is a soft connection device used between wiring steel pipe and explosion-proof equipment. It is used to pass cables through explosion-proof flexible pipes, isolate the flexible pipe from the outside space, and prevent sparks caused by poor contact or short circuit in the flexible pipe from igniting flammable and explosive gases from the outside. Explosion-proof flexible connecting pipes are suitable for combustible dust environments in Zones 20, 21, and 22, as well as IIB and IIC grade T1-T6 explosive mixture locations, as inlet and outlet connections for explosion-proof electrical equipment or in places where bending of steel pipe wiring is difficult.

[0003] Existing explosion-proof flexible tubes are usually used to wrap cables. When the cables are used in a large connection span or in a vertical state, the gravity of the cables and the flexible tubes will exert a large pulling force on the connection terminals of the cables, affecting the normal use of the cables. Utility Model Content

[0004] In order to reduce the cable connection bearing capacity and reasonably distribute the cable bearing weight, the present application provides a stainless steel explosion-proof flexible connecting pipe.

[0005] The present application provides a stainless steel explosion-proof flexible connecting pipe adopts the following technical solution:

[0006] A stainless steel explosion-proof flexible connecting pipe, comprising a pipe body and a connecting head arranged at the end of the pipe body;

[0007] The connecting head includes a first connecting ring, an extrusion piece arranged on the first connecting ring and a second connecting ring arranged on the extrusion piece; the inner side walls of the first connecting ring and the second connecting ring are provided with inner conical surfaces, the extrusion piece includes a connecting tube and an extrusion plate rotatably connected to the inner side wall of the connecting tube, the extrusion plate is used to cooperate with the inner conical surface, the first connecting ring and the second connecting ring are provided with external threads, and both ends of the connecting tube are provided with internal threads that cooperate with the external threads.

[0008] A further technical solution is that an extrusion groove is provided on the side wall of the extrusion plate, and an outer conical surface matching the inner conical surface is provided at the end of the extrusion plate.

[0009] A further technical solution is that a buffer layer made of rubber material is provided on the inner side of the extrusion plate.

[0010] A further technical solution is that sealing gaskets are provided between the extrusion piece and the first connecting ring and the second connecting ring.

[0011] This application has the following beneficial technical effects:

[0012] After the cable is passed through the flexible connecting tube, the first connecting ring is set on the tube body. When installing the extrusion piece and the second connecting ring, the extrusion plate can be abutted against the inner conical surfaces of the first connecting ring and the second connecting ring, and the inner side of the extrusion plate is pressed against the outer surface of the cable. As the threads approach each other during installation, the extrusion plate is pressed against the outer surface of the cable under the guidance of the conical surfaces of the first connecting ring and the second connecting ring, so that the tube body and the connector can bear the gravity of the cable, preventing the cable from falling down and causing the connection terminal to be unstable. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of the present application.

[0014] Figure numerals: 1. tube body; 2. connector; 3. first connecting ring; 4. extrusion piece; 41. connecting tube; 42. extrusion plate; 5. second connecting ring; 51. extension tube; 6. buffer layer; 7. sealing gasket. DETAILED DESCRIPTION

[0015] The technical solution in this application is further described in detail below in conjunction with the accompanying drawings.

[0016] The present application embodiment discloses a stainless steel explosion-proof flexible connecting pipe 41. Please refer to Figure 1 The stainless steel explosion-proof flexible connecting pipe 41 includes a pipe body 1 and a connecting head 2 arranged at the end of the pipe body 1; the connecting head 2 includes a first connecting ring 3, an extrusion piece 4 arranged on the first connecting ring 3 and a second connecting ring 5 arranged on the extrusion piece 4; the inner side walls of the first connecting ring 3 and the second connecting ring 5 are provided with an inner conical surface, the extrusion piece 4 includes a connecting pipe 41 and an extrusion plate 42 rotatably connected to the inner side wall of the connecting pipe 41, the extrusion plate 42 is used to cooperate with the inner conical surface, the first connecting ring 3 and the second connecting ring 5 are provided with external threads, and both ends of the connecting pipe 41 are provided with internal threads matching the external threads.

[0017] The first connecting ring 3 is arranged on the pipe body 1, and can be any one of threaded connection, welding or hydraulic cylinder extrusion and fixing connection, and is used to connect and fix the connector 2 to the pipe body 1. The expansion of the inner conical surface of the first connecting ring 3 and the expansion of the inner conical surface of the second connecting ring 5 are both facing the extrusion piece 4, so that the extrusion plate 42 is matched with the inner conical surface.

[0018] The side wall of the extrusion plate 42 is provided with an extrusion groove, and the end of the extrusion plate 42 is provided with an outer cone surface matched with the inner cone surface. There are two extrusion grooves to separate the extrusion plate 42 into two arc-shaped plates, and the outer cone surface at the end of the extrusion plate 42 has the same slope as the inner cone surface on the first connecting ring 3 and the second connecting ring 5. When the outer cone surface at the end of the extrusion plate 42 abuts against the inner cone surface of the first connecting ring 3 and the second connecting ring 5, the extrusion plate 42 continues to approach the first connecting ring 3 and the second connecting ring 5, and the extrusion plate 42 moves radially toward the axis of the tube body 1 under the guidance of the inner cone surface, that is, the cable set in the connector 2 is squeezed, so as to clamp and fix the cable.

[0019] Furthermore, a rubber buffer layer 6 is provided on the inner side of the extrusion plate 42. When the extrusion plate 42 extrudes the cable, the buffer layer 6 can be in direct contact with the cable to prevent the hardness of the extrusion plate 42 and the large extrusion force from damaging the insulation of the cable. When a cable with a larger diameter is passed through, a buffer layer 6 with a smaller thickness can be replaced; when a cable with a smaller diameter is passed through, a buffer layer 6 with a larger thickness can be replaced, thereby adapting to cables of different diameters.

[0020] Furthermore, a sealing gasket 7 is provided between the extrusion piece 4 and the first connecting ring 3 and the second connecting ring 5. When the extrusion piece 4 is threadedly connected to the first connecting ring 3 and the second connecting ring 5, the sealing gasket 7 can be squeezed to make the sealing gasket 7 improve the sealing between the extrusion piece 4 and the first connecting ring 3 and the second connecting ring 5, thereby improving the explosion-proof performance of the device.

[0021] An extension tube 51 with external threads is fixedly provided at the end of the second connecting tube 41 away from the extruded piece 4 for connecting to other pipe fittings or a junction box.

[0022] The implementation principle of the embodiment of the present application is:

[0023] After the cable is passed through the flexible connecting tube 41, the first connecting ring 3 is set on the tube body 1. When the extrusion piece 4 and the second connecting ring 5 are installed, the extrusion plate 42 can be abutted against the inner conical surfaces of the first connecting ring 3 and the second connecting ring 5, and the inner side of the extrusion plate 42 is pressed against the outer surface of the cable. As the threads approach each other during installation, the extrusion plate 42 is guided by the conical surfaces of the first connecting ring 3 and the second connecting ring 5, so that the extrusion plate 42 is pressed against the outer surface of the cable, so that the tube body 1 and the connector 2 can bear the gravity of the cable, thereby preventing the cable from falling down and causing the connection terminal to be unstable.

[0024] It should be noted that, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0025] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A stainless steel explosion-proof flexible connecting pipe (41), characterized in that: It comprises a tube body (1) and a connector (2) arranged at the end of the tube body (1); The connecting head (2) comprises a first connecting ring (3), an extrusion piece (4) arranged on the first connecting ring (3) and a second connecting ring (5) arranged on the extrusion piece (4); the inner side walls of the first connecting ring (3) and the second connecting ring (5) are provided with inner conical surfaces, the extrusion piece (4) comprises a connecting tube (41) and an extrusion plate (42) rotatably connected to the inner side wall of the connecting tube (41), the extrusion plate (42) is used to cooperate with the inner conical surface, the first connecting ring (3) and the second connecting ring (5) are provided with external threads, and both ends of the connecting tube (41) are provided with internal threads that cooperate with the external threads.

2. The stainless steel explosion-proof flexible connecting pipe (41) according to claim 1, characterized in that: An extrusion groove is provided on the side wall of the extrusion plate (42), and an outer conical surface matching the inner conical surface is provided at the end of the extrusion plate (42).

3. The stainless steel explosion-proof flexible connecting pipe (41) according to claim 1, characterized in that: The inner side surface of the extrusion plate (42) is provided with a buffer layer (6) made of rubber material.

4. The stainless steel explosion-proof flexible connecting pipe (41) according to claim 1, characterized in that: Sealing pads (7) are provided between the extrusion piece (4) and the first connecting ring (3) and the second connecting ring (5).

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