Double-layer corrugated pipe for gas appliance connection

Abstract

The utility model discloses a double-layer corrugated pipe for gas appliance connection, which comprises an inner corrugated pipe and an outer corrugated pipe, the outer corrugated pipe is coaxially sleeved outside the inner corrugated pipe, the two ends of the outer corrugated pipe are respectively provided with an insulating sleeve, the outer corrugated pipe comprises a corrugated section and straight side sections, the straight side sections are arranged at the two ends of the corrugated section, and the insulating sleeves are arranged at the two ends of the corrugated section. The outer walls of the insulation sleeve and the straight edge section are further sleeved with pressing sleeves, the pressing sleeves press the insulation sleeve and the straight edge section on the outer walls of the two ends of the inner corrugated pipe, the outer corrugated pipe and the inner corrugated pipe are both of a deformable and bendable flexible structure, and when the double-layer corrugated pipe is bent by external force, the outer corrugated pipe can be bent in the same direction along with the inner corrugated pipe. Therefore, linkage bending of the outer corrugated pipe and the inner corrugated pipe is achieved, the overall bending performance of the inner corrugated pipe can be effectively improved, and the service life of the inner corrugated pipe can be remarkably prolonged.

Description

Technical Field

[0001] This utility model relates to the field of corrugated pipe technology, and in particular to a double-layer corrugated pipe for connecting gas appliances. Background Technology

[0002] The outer wall of a bellows is typically fitted with a cladding layer or a protective tube, primarily to effectively protect the bellows from external erosion and damage. However, under current technological conditions, the bending performance of the outer cladding layer or tube is relatively low, failing to adequately meet the bending requirements of the inner bellows. This results in significant resistance during bending of the inner bellows due to the cladding layer or tube, affecting its normal bending performance. Repeated bending of the inner bellows can easily lead to fatigue fracture, thus impacting the bellows' service life and safety. Therefore, improvements are necessary. Utility Model Content

[0003] The purpose of this utility model is to address the defects and deficiencies of the existing technology by providing a double-layer corrugated pipe for connecting gas appliances. Its structure is simple and reasonable, and it is easy to operate. The outer corrugated pipe can bend in the same direction as the inner corrugated pipe to achieve linkage bending between the outer and inner corrugated pipes. This not only effectively improves the overall bending performance of the inner corrugated pipe, but also significantly extends its service life.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This utility model discloses a double-layer corrugated pipe for connecting gas appliances, comprising an inner corrugated pipe and an outer corrugated pipe. The outer corrugated pipe is coaxially sleeved outside the inner corrugated pipe, and insulating sleeves are provided at both ends of the outer corrugated pipe. The outer corrugated pipe includes a corrugated section and a straight edge section, with the straight edge section located at both ends of the corrugated section. A clamping sleeve is also sleeved on the outer wall of the insulating sleeve and the straight edge section, and the clamping sleeve presses the insulating sleeve and the straight edge section against the outer wall of both ends of the inner corrugated pipe. Both the outer and inner corrugated pipes are deformable and flexible structures. When the double-layer corrugated pipe is bent by external force, the outer corrugated pipe can bend in the same direction as the inner corrugated pipe, so as to realize the linkage bending of the outer and inner corrugated pipes.

[0006] Furthermore, a gap is formed between the outer wall of the inner bellows and the inner wall of the corrugated section.

[0007] Furthermore, pipe joints are provided at both ends of the inner corrugated pipe, the clamping sleeve is located between the pipe joint and the corrugated section, and an insulating sleeve is provided between the pipe joint and the inner corrugated pipe.

[0008] Furthermore, the pipe joint is provided with a limiting step, and the insulating sleeve is provided with a flange that cooperates with the limiting step.

[0009] Furthermore, a rubber gasket is provided inside the pipe joint, and the rubber gasket abuts against the end face of the inner corrugated pipe.

[0010] Furthermore, the end of the rubber gasket away from the inner bellows is provided with a bevel.

[0011] Furthermore, a retaining ring is provided on the outside of the inner bellows, and the retaining ring abuts between the insulating sleeve and the rubber gasket to axially limit the inner bellows.

[0012] Furthermore, the insulating sleeve is provided with a stepped portion that mates with the retaining ring.

[0013] Furthermore, both the corrugated section and the inner corrugated pipe include alternating crests and troughs, the cross-sections of the crests and troughs of the corrugated section are square, and the corners of the squares of the crests and troughs of the corrugated section are rounded.

[0014] Furthermore, the outer corrugated pipe is made of plastic material, and the inner corrugated pipe is made of stainless steel material.

[0015] The beneficial effects of this utility model are as follows: The double-layer corrugated pipe for connecting gas appliances described in this utility model allows the outer corrugated pipe to bend in the same direction as the inner corrugated pipe when the double-layer corrugated pipe is bent by external force, thereby achieving linkage bending of the outer and inner corrugated pipes. This design not only effectively improves the overall bending performance of the inner corrugated pipe, but also significantly extends its service life. The reason for achieving this effect is mainly because the bending performance of the outer coating layer or the outer tube of traditional corrugated pipes is relatively low, and it cannot well adapt to the bending requirements of the inner corrugated pipe. This causes the inner corrugated pipe to generate greater resistance when bending due to the influence of the coating layer or the outer tube, thus affecting the bending performance of the inner corrugated pipe. Repeated bending of the inner corrugated pipe can easily lead to fatigue fracture. However, the double-layer corrugated pipe, through the coordinated bending of the inner and outer layers, is less likely to affect the bending performance of the inner corrugated pipe, reducing the risk of fracture.

[0016] Both ends of the double-layer corrugated pipe are equipped with insulating sleeves, which can effectively insulate both ends and prevent current from passing through. This can effectively prevent current from breaking down the double-layer corrugated pipe and ensure the safety and reliability of the system. Attached Figure Description

[0017] Figure 1 This is a half-sectional structural diagram of the present invention;

[0018] Figure 2 yes Figure 1 A magnified structural diagram of point A in the middle.

[0019] Figures 1-2In the middle: 1. Inner corrugated pipe; 2. Outer corrugated pipe; 21. Corrugated section; 22. Straight edge section; 3. Insulating sleeve; 31. Flanged edge; 32. Stepped section; 4. Compression sleeve; 5. Pipe joint; 51. Limiting step; 6. Rubber gasket; 61. Inclined surface; 7. Snap ring. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figures 1-2 The diagram shows a double-walled corrugated pipe for connecting gas appliances, comprising an inner corrugated pipe 1 and an outer corrugated pipe 2. The outer corrugated pipe 2 is coaxially sleeved outside the inner corrugated pipe 1, effectively protecting the inner corrugated pipe 1. Insulating sleeves 3 are provided at both ends of the outer corrugated pipe 2, effectively insulating both ends and preventing current flow. This effectively avoids current breakdown of the double-walled corrugated pipe, ensuring the safety and reliability of the system. The outer corrugated pipe 2 includes a corrugated section 21 and a straight edge section 22. 22 is disposed at both ends of the corrugated section 21. Specifically, both the corrugated section 21 and the inner corrugated tube 1 include alternating peaks and troughs. The straight edge section 22 is a flat area without corrugations to meet connection requirements. A clamping sleeve 4 is also fitted on the outer wall of the insulating sleeve 3 and the straight edge section 22. The clamping sleeve 4 presses the insulating sleeve 3 and the straight edge section 22 against the outer walls at both ends of the inner corrugated tube 1. Specifically, the clamping sleeve 4 achieves clamping through a stamping process to ensure a stable and reliable connection. The outer corrugated tube 2... Both the outer corrugated pipe 2 and the inner corrugated pipe 1 are deformable and flexible structures. Specifically, the outer corrugated pipe 2 is made of plastic material, which has good elasticity and corrosion resistance, while the inner corrugated pipe 1 is made of stainless steel material, which has high structural strength. When the double-layer corrugated pipe is bent by external force, the outer corrugated pipe 2 can bend in the same direction as the inner corrugated pipe 1, so as to realize the linkage bending of the outer corrugated pipe 2 and the inner corrugated pipe 1. This design can not only effectively improve the overall bending performance of the inner corrugated pipe 1, but also significantly extend its service life. The reason why this effect can be achieved is mainly because the bending performance of the outer coating layer or the outer tube of the traditional corrugated pipe is relatively low, and it cannot adapt well to the bending requirements of the inner corrugated pipe. This causes the inner corrugated pipe to generate greater resistance when bending due to the influence of the coating layer or the outer tube, thus affecting the bending performance of the inner corrugated pipe. Repeated bending of the inner corrugated pipe can easily lead to fatigue fracture. However, the double-layer corrugated pipe, through the coordinated bending of the inner and outer layers, is less likely to affect the bending performance of the inner corrugated pipe 1, reducing the risk of fracture.

[0022] Preferably, in this embodiment, refer to Figure 2The corrugated section 21 has square cross-sections for both the crests and troughs, which provides better vertical support, improves the load-bearing capacity of the outer corrugated pipe 2, and prevents the outer corrugated pipe 2 from rolling undesirably. The corners of the square crests and troughs of the corrugated section 21 are rounded to avoid fatigue cracks caused by stress concentration.

[0023] Preferably, in this embodiment, refer to Figure 2 A gap is formed between the outer wall of the inner corrugated pipe 1 and the inner wall of the corrugated section 21, which can reduce wear caused by friction, extend service life, and allow the outer corrugated pipe 2 to bend more flexibly.

[0024] Preferably, in this embodiment, refer to Figure 1 Both ends of the inner corrugated pipe 1 are provided with pipe joints 5 for connection. The compression sleeve 4 is located between the pipe joint 5 and the corrugated section 21. An insulating sleeve 3 is provided between the pipe joint 5 and the inner corrugated pipe 1. The insulating sleeve 3 is tightly abutted between the two to effectively prevent current from passing through and ensure the safety and reliability of the system.

[0025] Preferably, in this embodiment, refer to Figure 2 The pipe joint 5 is provided with a limiting step 51, and the insulating sleeve 3 is provided with a flange 31 that cooperates with the limiting step 51 to ensure the stability of the connection and prevent the insulating sleeve 3 from falling off and affecting its use.

[0026] Preferably, in this embodiment, refer to Figure 2 The pipe joint 5 is further provided with a rubber gasket 6, which abuts against the end face of the inner bellows 1 to ensure the sealing of the connection. Preferably, in this embodiment, the end of the rubber gasket 6 away from the inner bellows 1 is provided with a bevel 61. During connection, the bevel 61 is used to compress the rubber gasket 6, filling the gap and achieving an effective seal.

[0027] Preferably, in this embodiment, refer to Figure 2 The inner corrugated tube 1 is fitted with a retaining ring 7 on its outside. The retaining ring 7 is positioned between the insulating sleeve 3 and the rubber gasket 6. Preferably, in this embodiment, the insulating sleeve 3 is provided with a stepped portion 32 that cooperates with the retaining ring 7. The retaining ring 7 is used to axially limit the inner corrugated tube 1, which can effectively play a role in resisting pull-out and prevent the inner corrugated tube 1 from being pulled out undesirably, thus affecting its use.

[0028] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A dual layer bellow for a gas appliance connection characterised in that: The double-layer corrugated pipe comprises an inner corrugated pipe (1) and an outer corrugated pipe (2), the outer corrugated pipe (2) is coaxially sleeved outside the inner corrugated pipe (1), both ends of the outer corrugated pipe (2) are provided with an insulating sleeve (3), the outer corrugated pipe (2) comprises a corrugated section (21) and a straight section (22), the straight section (22) is arranged at both ends of the corrugated section (21), the insulating sleeve (3) and the outer wall of the straight section (22) are further sleeved with a compression sleeve (4), the compression sleeve (4) compresses the insulating sleeve (3) and the straight section (22) on the outer wall of both ends of the inner corrugated pipe (1), the outer corrugated pipe (2) and the inner corrugated pipe (1) are both deformable and flexible, when the double-layer corrugated pipe is bent by external force, the outer corrugated pipe (2) can be bent in the same direction with the inner corrugated pipe (1), so as to realize the linkage bending of the outer corrugated pipe (2) and the inner corrugated pipe (1).

2. A dual corrugated gas appliance connection tube according to claim 1 characterised in that: A gap is formed between the outer wall of the inner corrugated pipe (1) and the inner wall of the corrugated section (21).

3. A dual corrugated gas appliance connection tube according to claim 1, characterised in that: Both ends of the inner corrugated pipe (1) are provided with a pipe joint (5), the compression sleeve (4) is located between the pipe joint (5) and the corrugated section (21), and the pipe joint (5) is provided with the insulating sleeve (3).

4. A dual corrugated gas appliance connection tube according to claim 3, characterised in that: The pipe joint (5) is provided with a limiting step (51), and the insulating sleeve (3) is provided with a turned edge (31) in limiting cooperation with the limiting step (51).

5. A dual corrugated gas appliance connection tube according to claim 3, characterised in that: The pipe joint (5) is further provided with a rubber gasket (6), and the rubber gasket (6) is abutted on the end face of the inner corrugated pipe (1).

6. A dual corrugated gas appliance connection tube according to claim 5, characterised in that: An inclined surface (61) is arranged at the end of the rubber gasket (6) away from the inner corrugated pipe (1).

7. A dual corrugated gas appliance connection tube according to claim 6, characterised in that: A clamping ring (7) is sleeved outside the inner corrugated pipe (1), and the clamping ring (7) is abutted between the insulating sleeve (3) and the rubber gasket (6) to axially limit the inner corrugated pipe (1).

8. A dual corrugated gas appliance connection tube according to claim 7, characterised in that: The insulating sleeve (3) is provided with a step portion (32) in cooperation with the clamping ring (7).

9. A dual corrugated gas appliance connection as claimed in claim 1, characterised in that: The corrugated section (21) and the inner corrugated pipe (1) both comprise alternating wave crests and wave troughs, the wave crests and wave troughs of the corrugated section (21) are both provided in square section, and the corners of the square section of the wave crests and wave troughs of the corrugated section (21) are all provided in round shape.

10. A dual corrugated gas appliance connection tube according to claim 1, characterised in that: The outer corrugated pipe (2) is made of plastic material, and the inner corrugated pipe (1) is made of stainless steel material.

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