Explosion-proof spiral flexible connecting pipe

Abstract

The utility model discloses an anti-explosion spiral flexible connecting pipe which comprises a pipe body, two fixing sleeves fixedly installed at the two ends of the pipe body respectively, a connecting nut rotationally installed on the outer sides of the fixing sleeves and a threaded connector in threaded connection with the connecting nut, and a plurality of rotation stopping inclined blocks which are annularly distributed at equal intervals are arranged on the side, close to the pipe body, of the connecting nut. A supporting cylinder is fixedly connected to the outer side of the fixing sleeve, a sliding sleeve is slidably installed in the supporting cylinder, one end of the sliding sleeve extends to the outer side of the supporting cylinder, an abutting ring is integrally formed on the sliding sleeve, a plurality of grooves matched with the rotation stopping inclined blocks are formed in one side of the abutting ring, and a connecting cylinder is arranged on the inner wall of the supporting cylinder; according to the utility model, through the arrangement of the abutting ring, the groove and the rotation stopping inclined block, the threaded joint can be ensured to be firmly connected with external equipment in a vibration environment, and the phenomenon of looseness is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of explosion-proof flexible connecting pipes, in particular to an explosion-proof spiral flexible connecting pipe. Background Art

[0002] Explosion-proof flexible connecting pipe is a special pipe connecting pipe, which is mainly used in hazardous places such as chemical, petroleum, natural gas, and medicine. Its main feature is that it has a certain elasticity and flexibility, which can reduce the impact and torsion of the pipeline, thereby extending the service life of the pipeline, reducing pipeline leakage and accidents. Its specific structure is that the two ends of the hose are metal threaded joints, and the pipe body is composed of three forms: metal hose, outer layer of cloth-interlayered high-quality rubber and reinforced nylon hose sheath, and sandwich steel wire braided mesh pipe.

[0003] The existing explosion-proof spiral flexible connecting pipe is connected to the external equipment through a metal threaded joint. In actual use, it is sometimes installed in an environment that is often subjected to vibration, such as when installed on equipment such as explosion-proof motors. After being subjected to long-term vibration, the metal threaded joint is prone to loosening or even falling off, affecting its use effect. Utility Model Content

[0004] The utility model aims to provide an explosion-proof spiral flexible connecting pipe to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an explosion-proof spiral flexible connecting pipe, comprising a pipe body, two fixing sleeves respectively fixedly installed at two ends of the pipe body, a connecting nut rotatably installed on the outside of the fixing sleeve, and a threaded joint threadedly connected to the connecting nut, wherein a plurality of anti-rotation bevel blocks distributed in an annular shape and at equal intervals are provided on the side of the connecting nut close to the pipe body, a supporting tube is fixedly connected to the outside of the fixing sleeve, a sliding sleeve is slidably installed inside the supporting tube, one end of the sliding sleeve extends to the outside of the supporting tube, and an abutment ring is integrally formed on the sliding sleeve, a plurality of grooves matching the anti-rotation bevel blocks are opened on one side of the abutment ring, a connecting tube is provided on the inner wall of the supporting tube, a receiving groove is provided between the connecting tube and the supporting tube, and a retaining spring is installed at the receiving groove.

[0006] As a preferred solution of the utility model, the end of the connecting tube close to the retaining spring is provided with a chamfer, and the end of the sliding sleeve close to the retaining spring is provided with a contraction portion.

[0007] As a preferred solution of the utility model, a side of the support tube close to the abutment ring is integrally formed with a rib, and limiting grooves are symmetrically provided on the rib. A limiting block slidably connected to the limiting groove is fixedly connected to the outer side of the sliding sleeve.

[0008] As a preferred solution of the utility model, a limiting ring is provided on the outer side of the sliding sleeve.

[0009] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model can ensure that the threaded joint is firmly connected to the external equipment in a vibration environment and avoid loosening through the provision of the abutment ring, groove and anti-rotation bevel block, and the provision of the retaining spring can apply thrust to the sliding sleeve, thereby ensuring that the abutment ring can always be tightly attached to the connecting nut, avoiding the anti-rotation bevel block and the groove from separating under the action of external force. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0011] Figure 2 This is a schematic diagram of the structure of the utility model after removing the support tube and the abutment ring;

[0012] Figure 3 For this utility model Figure 2 The enlarged view of point A in the middle;

[0013] Figure 4 This is a schematic diagram of the structure of the support tube and the sliding sleeve of the utility model;

[0014] Figure 5 For this utility model Figure 4 Exploded diagram of

[0015] Figure 6 It is a schematic diagram of the structure inside the support tube of the utility model.

[0016] In the figure: 1. tube body; 2. fixing sleeve; 3. connecting nut; 4. threaded joint; 5. abutment ring; 6. supporting tube; 7. anti-rotation bevel block; 8. limit block; 9. sliding sleeve; 10. groove; 11. limit groove; 12. retaining edge; 13. retaining spring; 14. contraction part; 15. limit ring; 16. chamfer; 17. connecting tube; 18. accommodating groove. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figures 1 to 6The utility model provides a technical solution: an explosion-proof spiral flexible connecting pipe, comprising a pipe body 1, two fixing sleeves 2 respectively fixedly installed at both ends of the pipe body 1, the structure inside the pipe body 1 and the connection structure between the fixing sleeve 2 and the pipe body 1 are prior arts, so they are not described in detail, a connecting nut 3 rotatably installed on the outside of the fixing sleeve 2, and a threaded joint 4 threadedly connected to the connecting nut 3, the threaded joint 4 can be an external threaded joint or an internal threaded joint, which can be selected according to actual conditions, a plurality of anti-rotation bevel blocks 7 distributed in an annular manner and equidistantly on the side of the connecting nut 3 close to the pipe body 1, a support tube 6 is fixedly connected to the outside of the fixing sleeve 2, a sliding sleeve 9 is slidably installed inside the support tube 6, one end of the sliding sleeve 9 extends to the outside of the support tube 6, and the sliding sleeve 9 is integrally formed with an abutment ring 5, and a plurality of grooves 10 matching the anti-rotation bevel blocks 7 are provided on one side of the abutment ring 5, when the connecting nut 3 is connected When the threaded joint 4 is rotated clockwise to tighten with the external equipment, the inclined surface of the anti-rotation bevel block 7 contacts the abutment ring 5, which will push the abutment ring 5 to move in the direction away from the connecting nut 3, and the abutment ring 5 will not prevent the connecting nut 3 from rotating clockwise. When the connecting nut 3 and the threaded joint 4 are rotated counterclockwise to loosen with the external equipment, the right-angled surface of the anti-rotation bevel block 7 will contact the abutment ring 5, making it impossible for the connecting nut 3 and the threaded joint 4 to rotate counterclockwise, thereby avoiding loosening and ensuring a firm connection. A connecting cylinder 17 is provided on the inner wall of the support cylinder 6, and a receiving groove 18 is provided between the connecting cylinder 17 and the support cylinder 6. The receiving groove 18 is used to limit the position of the retaining spring 13 to prevent the retaining spring 13 from being misplaced. A retaining spring 13 is installed at the retaining groove 18, and the retaining spring 13 is used to apply a thrust to the sliding sleeve 9, thereby ensuring that the abutment ring 5 can always be close to the connecting nut 3 to avoid the anti-rotation bevel block 7 from separating from the groove 10 under the action of external force.

[0019] The end of the connecting tube 17 close to the retaining spring 13 is provided with a chamfer 16 , and the end of the sliding sleeve 9 close to the retaining spring 13 is provided with a contraction portion 14 . The chamfer 16 and the contraction portion 14 facilitate the sliding sleeve 9 to deform the retaining spring 13 .

[0020] Among them, a side of the support tube 6 close to the abutment ring 5 is integrally formed with a retaining edge 12, and a limiting groove 11 is symmetrically arranged on the retaining edge 12. The outer side of the sliding sleeve 9 is fixedly connected with a limiting block 8 that is slidably connected to the limiting groove 11. The limiting block 8 and the limiting groove 11 are used together to limit the sliding sleeve 9, so that the sliding sleeve 9 can slide inside the support tube 6 but cannot rotate.

[0021] A limiting ring 15 is disposed on the outer side of the sliding sleeve 9 , and the limiting ring 15 will be blocked by the retaining edge 12 , thereby preventing the sliding sleeve 9 from being separated from the supporting tube 6 .

[0022] Specifically, when in use, rotate the appropriate threaded joint 4 according to the actual situation, screw the threaded joint 4 onto the connecting nut 3, and then after the pipeline or line passes through the pipe body 1, rotate the threaded joint 4 and the connecting nut 3 clockwise to connect the threaded joint 4 with the external device. During the clockwise rotation, the inclined surface of the anti-rotation bevel block 7 contacts the inner wall of the groove 10 on the abutment ring 5 and pushes the abutment ring 5 to move away from the connecting nut 3. At this time, the abutment ring 5 will not prevent the connecting nut 3 from rotating clockwise. When the connecting nut 3 and the threaded joint are vibrated, When the head 4 tends to rotate counterclockwise and loosen the external equipment, the right-angled surface of the anti-rotation bevel block 7 will contact the inner wall of the groove 10 on the abutment ring 5. Since the abutment ring 5 cannot rotate, the anti-rotation bevel block 7 is blocked and cannot move, so that the connecting nut 3 and the threaded joint 4 cannot rotate counterclockwise, thereby avoiding loosening and ensuring a firm connection in a vibrating environment. If disassembly is required, just push the abutment ring 5 away from the connecting nut 3 to separate the anti-rotation bevel block 7 from the groove 10, and then the threaded joint 4 and the connecting nut 3 can be disassembled.

[0023] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0025] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof spiral flexible connecting pipe, comprising a pipe body (1), two fixing sleeves (2) respectively fixedly mounted on both ends of the pipe body (1), a connecting nut (3) rotatably mounted on the outside of the fixing sleeve (2), and a threaded joint (4) threadedly connected to the connecting nut (3), characterized in that: The connecting nut (3) is provided with a plurality of anti-rotation bevel blocks (7) equidistantly distributed in an annular shape on one side close to the tube body (1); the outer side of the fixing sleeve (2) is fixedly connected to a support tube (6); a sliding sleeve (9) is slidably installed inside the support tube (6); one end of the sliding sleeve (9) extends to the outer side of the support tube (6); and the sliding sleeve (9) is integrally formed with an abutment ring (5); one side of the abutment ring (5) is provided with a plurality of grooves (10) matching with the anti-rotation bevel blocks (7); the inner wall of the support tube (6) is provided with a connecting tube (17); a receiving groove (18) is provided between the connecting tube (17) and the support tube (6); a retaining spring (13) is installed at the receiving groove (18).

2. The explosion-proof spiral flexible connecting pipe according to claim 1, characterized in that: The end of the connecting tube (17) close to the retaining spring (13) is provided with a chamfer (16), and the end of the sliding sleeve (9) close to the retaining spring (13) is provided with a contraction portion (14).

3. The explosion-proof spiral flexible connecting pipe according to claim 1, characterized in that: A retaining edge (12) is integrally formed on one side of the support tube (6) close to the abutment ring (5), and a limiting groove (11) is symmetrically provided on the retaining edge (12). A limiting block (8) slidably connected to the limiting groove (11) is fixedly connected to the outer side of the sliding sleeve (9).

4. The explosion-proof spiral flexible connecting pipe according to claim 1, characterized in that: A limiting ring (15) is provided on the outer side of the sliding sleeve (9).

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