Corrugated pipe

Abstract

The utility model discloses a corrugated pipe which comprises a corrugated pipe body, a supporting sleeve and an external thread sleeve, the supporting sleeve and the external thread sleeve are fixed to the head end and the tail end of the corrugated pipe body respectively, a dovetail type rotation anti-disengaging structure is arranged on the peripheral face of the supporting sleeve, and an internal thread outer ring sleeve is installed on the peripheral face of the supporting sleeve through the dovetail type rotation anti-disengaging structure. The inner thread outer ring sleeve and the outer thread sleeve are in threaded fit, and a double-layer annular sealing structure is arranged on the outer wall of the opposite side of the outer thread sleeve and the supporting sleeve. Double-layer sealing design is formed between the inner thread outer ring sleeve and the outer thread sleeve, more reliable sealing protection is formed at the joint of the corrugated pipe, medium leakage can be effectively prevented, the structure at the joint of the corrugated pipe is firmer through thread fit of the inner thread outer ring sleeve and the outer thread sleeve, and the service life of the corrugated pipe is prolonged. Loosening or displacement is not prone to occurring, and the overall stability of a pipeline system is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of corrugated pipes, in particular to a corrugated pipe. Background Art

[0002] As an important component of the pipeline system, the structure of the bellows is mainly composed of a bellows body and a flange. The bellows body is made of flexible metal material and has a corrugated structure. It can absorb vibration, compensate for thermal expansion and contraction, and has a certain pressure bearing capacity. The bellows flange is used to connect the bellows with other piping system components and is usually made of the same or similar material as the bellows body, such as stainless steel or carbon steel. The functions of the bellows include absorbing vibration, compensating for thermal expansion and contraction, reducing noise, improving fluid transmission performance, etc., thereby protecting the stability and safety of the pipeline system;

[0003] For example, a connection structure of a bellows disclosed in the authorization announcement number CN219975706U includes a bellows body, a butt joint, a butt joint groove, a plug-in block and a plug-in limit plate, the top right side of the bellows body is fixedly installed in the middle of the left side of the butt joint, a butt joint groove is opened in the middle of the right side of the butt joint, and a plug-in block is inserted into the inner side of the butt joint groove, and a plug-in limit plate is fixedly installed on the top right side of the plug-in block, and the outer walls of the butt joint and the plug-in limit plate are limitedly connected by a limiting mechanism, etc., and under the action of the limiting mechanism, the bellows body can be limitedly connected with different connecting ends. However, after the two bellows are butt-jointed, the butt joint of the two bellows, that is, the joint of the butt joint and the plug-in limit plate, still has a large gap. At this time, the sealing performance of the pipeline will be affected, especially under high pressure or high temperature conditions, resulting in an increased risk of leakage in the pipeline system. Utility Model Content

[0004] The purpose of the utility model is to provide a bellows, at the two ends of the bellows are respectively provided with an internal thread outer ring sleeve and an external thread sleeve, and after the threaded outer ring sleeve and the external thread sleeve are connected, a double-layer annular sealing structure is formed between the two to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a bellows, comprising a bellows body and a support sleeve and an external threaded sleeve fixed at the head and tail ends of the bellows body respectively, the outer circumferential surface of the support sleeve is provided with a dovetail type rotation anti-slip structure, the outer circumferential surface of the support sleeve is installed with an internal threaded outer ring sleeve through the dovetail type rotation anti-slip structure, the internal threaded outer ring sleeve and the external threaded sleeve are threadedly matched, a double-layer annular sealing structure is provided on the outer wall on the opposite side of the external threaded sleeve and the support sleeve, an arc-shaped solid protrusion is installed on the inner wall of the support sleeve, and an arc-shaped inner concave shell for plugging with the arc-shaped solid protrusion is installed on the inner wall of the external threaded sleeve.

[0006] Preferably, the double-layer annular sealing structure includes two annular convex edges integrally formed on the outer wall of one side of the support sleeve, and two annular concave grooves arranged on the outer wall of one side of the external threaded sleeve, and the annular convex edges and the annular concave grooves are matched and plugged into each other.

[0007] Preferably, the dovetail type rotation anti-slip structure includes an annular dovetail edge fixed on the inner wall of the internally threaded outer ring sleeve, and an annular dovetail groove arranged on the outer ring surface of the support sleeve.

[0008] Preferably, a cross partition plate is fixed inside the corrugated tube body, and a rectangular hollow portion is provided on the outer wall of the cross partition plate.

[0009] Preferably, four clips symmetrical about the central axis of the corrugated pipe body are fixed to one end of the cross partition plate.

[0010] Preferably, three equidistant positioning pins are fixed on the outer wall of the arc-shaped solid protrusion away from the support sleeve, and a through hole for the positioning pins to pass through is provided on the inner wall of one side of the arc-shaped concave shell.

[0011] Preferably, the external threaded sleeve, the internal threaded outer ring sleeve and the supporting sleeve are all made of stainless steel.

[0012] Compared with the prior art, the beneficial effect of the utility model is that the bellows is provided with a structure that cooperates with each other, such as an internally threaded outer ring sleeve and an externally threaded sleeve, and the relative outer wall surfaces of the support sleeve and the externally threaded sleeve are connected through a double-layer annular sealing structure, and the arc-shaped solid protrusion is inserted into the arc-shaped concave shell to complete the connection of the two bellows. The double-layer annular sealing knot forms a double-layer sealing design between the internally threaded outer ring sleeve and the externally threaded sleeve, so that the connection of the bellows forms a more reliable sealing protection, which can effectively prevent medium leakage, and through the threaded cooperation of the internally threaded outer ring sleeve and the externally threaded sleeve, the structure of the connection of the bellows is more solid, not easy to loosen or displace, thereby ensuring the overall stability of the pipeline system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the three-dimensional structure of the bellows body of the utility model;

[0014] Figure 2 This is a schematic diagram of the three-dimensional structure of the bellows body after docking of the utility model;

[0015] Figure 3 This is a schematic diagram of the main cross-sectional structure of the bellows body of the utility model after docking;

[0016] Figure 4 It is a schematic diagram of the three-dimensional cross-sectional structure of the bellows body after docking of the utility model;

[0017] Figure 5 For this utility model Figure 4 The enlarged structural diagram at A in the middle;

[0018] In the figure: 1, bellows body; 2, internally threaded outer ring sleeve; 3, externally threaded sleeve; 301, annular recessed groove; 4, supporting sleeve; 401, annular convex edge; 5, dovetail type rotary anti-slip structure; 6, cross partition plate; 601, clip; 7, arc-shaped solid protrusion; 8, positioning pin; 9, arc-shaped concave shell. DETAILED DESCRIPTION

[0019] 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. 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.

[0020] See also Figure 1-5 The utility model provides an embodiment: a bellows, comprising a bellows body 1 and a support sleeve 4 and an external thread sleeve 3 fixed at the head and tail ends of the bellows body 1 respectively, the outer circumferential surface of the support sleeve 4 is provided with a dovetail type rotation anti-slip structure 5, the outer circumferential surface of the support sleeve 4 is installed with an internal thread outer ring sleeve 2 through the dovetail type rotation anti-slip structure 5, the internal thread outer ring sleeve 2 and the external thread sleeve 3 are threadedly matched, a double-layer annular sealing structure is provided on the outer wall of the external thread sleeve 3 and the opposite side of the support sleeve 4, an arc-shaped solid protrusion 7 is installed on the inner wall of the support sleeve 4, and an arc-shaped inner concave shell 9 for plugging with the arc-shaped solid protrusion 7 is installed on the inner wall of the external thread sleeve 3;

[0021] The external thread sleeve 3, the internal thread outer ring sleeve 2 and the support sleeve 4 are all made of stainless steel. The stainless steel has excellent corrosion resistance and can resist the erosion of most chemical media. It is not easy to rust or corrode. This allows the external thread sleeve 2, the internal thread outer ring sleeve 3 and the support sleeve 4 to be used for a long time in harsh environments such as humidity, acid and alkali, and maintain good performance and appearance;

[0022] The double-layer annular sealing structure includes two annular convex edges 401 integrally formed on the outer wall of one side of the support sleeve 4, and two annular concave grooves 301 arranged on the outer wall of one side of the external thread sleeve 3. The annular convex edges 401 and the annular concave grooves 301 are matched and plugged into each other. After the internal thread outer ring sleeve 2 and the external thread sleeve 3 are screwed into place, the two annular convex edges 401 respectively enter the corresponding annular concave grooves 301 on the outer wall of the external thread sleeve 3. The annular concave grooves 301 and the annular convex edges 401 form multiple sealing surfaces, which can effectively withstand the impact of high-pressure media, prevent media leakage, and ensure the safe operation of the pipeline system.

[0023] The dovetail type rotary anti-slip structure 5 includes an annular dovetail edge fixed on the inner wall of the internal thread outer ring sleeve 2, and an annular dovetail groove arranged on the outer ring surface of the support sleeve 4. When the internal thread outer ring sleeve 2 rotates, the annular dovetail edge on the inner wall of the internal thread outer ring sleeve 2 cooperates with the annular dovetail groove on the outer wall of the support sleeve 4. The worker only needs to dock the external thread sleeve 3 with the internal thread outer ring sleeve 2, and then complete the installation by self-rotation, without the need for complicated docking and fixing operations, thereby simplifying the installation process.

[0024] A cross partition plate 6 is fixed inside the bellows body 1, and a rectangular hollow portion is provided on the outer wall of the cross partition plate 6. The cross partition plate 6 can divide the internal space of the bellows body 1 into a plurality of small intervals, which helps to reduce the turbulence of the medium in the pipeline and improve the flow uniformity of the medium. The cross partition plate 6 can also increase the structural strength of the bellows and reduce the deformation and vibration of the pipeline during operation.

[0025] One end of the cross partition plate 6 is fixed with four clips 601 symmetrical about the central axis of the bellows body 1. When the two bellows bodies 1 are connected end to end, the clips 601 are just placed on the cross partition plate 6 of the other bellows body 1, so that the two cross partition plates 6 are overlapped by the clips 601.

[0026] Three equally spaced positioning pins 8 are fixed on the outer wall of the arc-shaped solid protrusion 7 on one side away from the support sleeve 4, and a through hole for the positioning pins 8 to pass through is provided on the inner wall of one side of the arc-shaped concave shell 9. When the arc-shaped solid protrusion 7 is plugged into the arc-shaped concave shell 9, the positioning pins 8 will penetrate to the outside of the arc-shaped concave shell 9. The arrangement of the positioning pins 8 and the through holes makes the arc-shaped solid protrusion 7 and the arc-shaped concave shell 9 more stable after connection.

[0027] When the embodiment of the present application is in use, the staff first takes out the two bellows bodies 1 to be connected, and makes the head and tail ends of the two bellows bodies 1 concentric and opposite, then inserts the inner thread outer ring sleeve 2 and the outer thread sleeve 3 concentrically together and continuously screws the inner thread outer ring sleeve 2. At this time, due to the connection effect of the thread groove, the inner thread outer ring sleeve 2 and the outer thread sleeve 3 will continue to approach each other until the two are screwed and matched to the limit position. In this process, the inner thread outer ring sleeve 2 rotates on the outer ring surface of the support sleeve 4 through the dovetail type rotary anti-slip structure 5, and the support sleeve 4 and the outer thread sleeve 3 are mutually The outer wall surfaces of the two bellows are connected through a double-layer annular sealing structure, and the arc-shaped solid protrusion 7 is inserted into the arc-shaped concave shell 9 to complete the connection of the two bellows. In the pipeline, the double-layer annular sealing knot is formed between the internal thread outer ring sleeve 2 and the external thread sleeve 3 to form a double-layer sealing design, so that the bellows connection forms a more reliable sealing protection, which can effectively prevent medium leakage, and the threaded cooperation of the internal thread outer ring sleeve 2 and the external thread sleeve 3 makes the structure of the bellows connection more solid, not easy to loosen or move, thereby ensuring the overall stability of the pipeline system.

[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A bellows, characterized in that: The invention comprises a bellows body (1) and a support sleeve (4) and an external thread sleeve (3) fixed at the head and tail ends of the bellows body (1), the outer circumferential surface of the support sleeve (4) is provided with a dovetail type rotation anti-slip structure (5), the outer circumferential surface of the support sleeve (4) is provided with an internal thread outer ring sleeve (2) through the dovetail type rotation anti-slip structure (5), the internal thread outer ring sleeve (2) and the external thread sleeve (3) are threadedly matched, a double-layer annular sealing structure is provided on the outer walls on the opposite sides of the external thread sleeve (3) and the support sleeve (4), an arc-shaped solid protrusion (7) is installed on the inner wall of the support sleeve (4), and an arc-shaped inner concave shell (9) for plugging with the arc-shaped solid protrusion (7) is installed on the inner wall of the external thread sleeve (3).

2. A corrugated tube according to claim 1, characterized in that: The double-layer annular sealing structure comprises two annular convex edges (401) integrally formed on the outer wall of one side of the support sleeve (4), and two annular concave grooves (301) arranged on the outer wall of one side of the external threaded sleeve (3), wherein the annular convex edges (401) and the annular concave grooves (301) are matched and plugged into each other.

3. A corrugated tube according to claim 1, characterized in that: The dovetail type rotation anti-slip structure (5) comprises an annular dovetail edge fixed on the inner wall of the internally threaded outer ring sleeve (2), and an annular dovetail groove arranged on the outer ring surface of the support sleeve (4).

4. A corrugated tube according to claim 1, characterized in that: A cross partition plate (6) is fixed inside the corrugated pipe body (1), and a rectangular hollow portion is provided on the outer wall of the cross partition plate (6).

5. A corrugated tube according to claim 4, characterized in that: Four clips (601) symmetrical about the central axis of the corrugated pipe body (1) are fixed to one end of the cross partition plate (6).

6. A corrugated tube according to claim 1, characterized in that: Three equidistant positioning pins (8) are fixed on the outer wall of the arc-shaped solid protrusion (7) away from the support sleeve (4), and a through hole for the positioning pins (8) to pass through is provided on the inner wall of one side of the arc-shaped concave shell (9).

7. A corrugated tube according to claim 1, characterized in that: The external thread sleeve (3), the internal thread outer ring sleeve (2) and the support sleeve (4) are all made of stainless steel components.

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