Double-bore copper pipe

Abstract

The utility model provides a kind of double aperture copper pipe, it is related to pipe field, including outer layer parent pipe and the first inner tube and second inner tube being set in the inner portion of outer layer parent pipe, the first inner tube and second inner tube are fixed on the inner wall of outer layer parent pipe by flexible support piece spaced distribution along pipe length direction, the first inner tube and second inner tube are configured to be able to replace independently of outer layer parent pipe.The application effectively absorbs vibration energy by flexible support piece, avoids the problem that inner tube is easily worn due to rigid support;Wherein the design that inner tube is replaced independently of outer layer parent pipe, when single inner tube fails, whole pipe does not need to be scrapped, greatly reduces maintenance cost and time, the above can solve the problem that traditional double aperture copper pipe is poor in vibration resistance and inconvenient to maintain.

Description

Technical Field

[0001] This utility model relates to the field of pipes, and in particular to a double-diameter copper pipe. Background Technology

[0002] In fluid transport systems, especially in applications requiring the simultaneous transport of two media while strictly preventing their mixing, such as refrigeration and chemical industries, the use of dual-channel pipes is becoming increasingly widespread. These pipes typically consist of an outer pipe and multiple independent inner pipes, commonly known as a pipe-in-pipe structure, which enables the integrated layout of complex flow paths within a limited space.

[0003] Currently, most existing pipe-in-pipe structures employ the method of directly embedding the inner pipe inside the outer pipe. To ensure the positioning of the inner pipe, simple rigid supports or fillers are typically used for fixation. In this case, both ends of the inner pipe are usually permanently fixed to the system interface along with the outer pipe.

[0004] However, the existing structure has some problems. First, rigid supports cannot effectively absorb the energy transmitted by fluid pulsation or external vibration, which can easily lead to damage between the inner and outer pipe walls due to long-term friction. Second, when a single inner pipe fails due to corrosion or blockage, the entire composite pipe often needs to be replaced, resulting in high maintenance costs and complicated operations. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by using flexible support components to effectively absorb vibration energy and avoid the problem of easy wear of the inner tube due to rigid support. The design of replacing the inner tube independently of the outer mother tube eliminates the need to scrap the entire tube when a single inner tube fails, greatly reducing maintenance costs and time. All of the above can solve the problems of poor vibration resistance and inconvenient maintenance of traditional double-diameter copper tubes.

[0006] To solve the above-mentioned technical problems, this utility model solves the problems of poor vibration resistance and inconvenient maintenance of traditional double-diameter copper pipes through the following technical solution.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A double-diameter copper tube includes an outer mother tube and a first inner tube and a second inner tube disposed inside the outer mother tube. The first inner tube and the second inner tube are fixed to the inner wall of the outer mother tube by flexible support members spaced apart along the tube length. Both the first inner tube and the second inner tube are configured to be replaceable independently of the outer mother tube.

[0009] Preferably, the flexible support is an annular bushing, the outer wall of which is interference-fitted with the inner wall of the outer mother tube, and the inner wall of which is provided with a groove that matches the shape of the first inner tube and the second inner tube.

[0010] Preferably, the annular bushing is made of rubber or polytetrafluoroethylene.

[0011] Preferably, at least one end of the first inner tube and the second inner tube is configured to be connected to an external pipeline via a detachable pipe fitting, thereby enabling independent replacement.

[0012] Preferably, the pipe fitting is a quick-connect fitting.

[0013] Preferably, the inner diameter of the first inner tube is equal to the inner diameter of the second inner tube.

[0014] Preferably, the annular space between the outer mother tube, the first inner tube, and the second inner tube forms a sealed detection channel, which is provided with an interface for filling inert gas and installing a pressure sensor.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The double-diameter copper tube provided in this application effectively absorbs vibration energy through flexible support components, avoiding the problem of easy wear of the inner tube due to rigid support. The design of replacing the inner tube independently of the outer mother tube eliminates the need to scrap the entire tube when a single inner tube fails, greatly reducing maintenance costs and time. The above can solve the problems of poor vibration resistance and inconvenient maintenance of traditional double-diameter copper tubes. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the disassembled structure of this utility model.

[0020] Drawing number explanation: 1. Outer mother tube; 21. First inner tube; 22. Second inner tube; 3. Flexible support; 31. Annular bushing; 32. Slot; 4. Pipe joint; 5. Inspection channel; 51. Interface. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0023] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0024] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number. Example

[0025] Please see Figure 1 and Figure 2 A double-diameter copper tube includes an outer mother tube 1 and a first inner tube 21 and a second inner tube 22 disposed inside the outer mother tube 1. The first inner tube 21 and the second inner tube 22 are fixed to the inner wall of the outer mother tube 1 by flexible support members 3 distributed at intervals along the tube length. The first inner tube 21 and the second inner tube 22 are both configured to be replaceable independently of the outer mother tube 1.

[0026] The double-diameter copper tube of this application is mainly composed of an outer mother tube 1, a first inner tube 21, a second inner tube 22, and a flexible support member 3.

[0027] The outer mother tube 1 is a straight copper tube with a large diameter, and its length is determined according to actual engineering requirements. The first inner tube 21 and the second inner tube 22 are two independent copper tubes with smaller diameters and lengths approximately equivalent to the outer mother tube 1, arranged parallel to each other in the internal cavity of the outer mother tube 1. In this embodiment, the first inner tube 21 and the second inner tube 22 preferably have the same inner diameter and wall thickness to ensure consistency of flow resistance and ease of manufacturing.

[0028] The flexible support 3 takes the form of an annular bushing 31, which is made of polytetrafluoroethylene (PTFE), a material with excellent elasticity. PTFE not only possesses good flexibility and wear resistance but also excellent chemical stability, making it suitable for various fluid media. The outer diameter of the annular bushing 31 is slightly larger than the inner diameter of the outer mother tube 1, and it is tightly fixed to the inner wall of the outer mother tube 1 by an interference fit. Two precisely machined circular grooves 32 are formed on its inner wall. The diameter of these two grooves 32 matches the outer diameter of the first inner tube 21 and the second inner tube 22, thereby firmly holding the two inner tubes in place and separating them from each other so that they do not come into contact.

[0029] Multiple annular bushings 31 are distributed at certain intervals along the axial direction of the outer mother tube 1, such as every 1 meter. This spacing arrangement can provide sufficient support for the inner tube to prevent it from shaking excessively under the action of fluid, and also ensure that the inner tube has a certain adaptive adjustment space when it is thermally expanded and contracted or under stress, thus avoiding stress concentration caused by rigid constraints.

[0030] Detachable pipe fittings 4 are provided at both ends of the first inner tube 21 and the second inner tube 22. This embodiment preferably uses quick-connect fittings, which include a male and a female connector, respectively connected to the end of the inner tube and the external pipeline (not shown in the figure). When it is necessary to replace one of the inner tubes, simply disconnect the corresponding quick-connect fitting. The faulty inner tube can be pulled out separately from the outer mother tube 1, while a new inner tube is inserted. The quick-connect fittings are then reconnected at both ends. The operation is extremely simple, requiring no replacement or movement of the outer mother tube 1 or another intact inner tube.

[0031] Furthermore, a sealed annular space is naturally formed between the inner wall of the outer mother tube 1 and the outer walls of the first inner tube 21 and the second inner tube 22, and this space is constructed as a detection channel 5. An interface 51 is provided on the wall of the outer mother tube 1, which can be used to fill the detection channel 5 with dry nitrogen or other inert gases, and can also be used to install a pressure sensor or a vacuum gauge.

[0032] In another embodiment, the annular bushing 31 of the flexible support 3 is made of oil-resistant rubber material, suitable for applications where cost is more sensitive and media compatibility is required. Meanwhile, the interface 51 of the detection channel 5 is connected to a micro-positive pressure monitoring system for real-time monitoring of pressure changes within the channel.

[0033] Working principle

[0034] During fluid transport, pump and valve start-up and shutdown, sudden changes in flow rate, or external mechanical vibrations inevitably generate pulsations and vibrations. Traditional rigid supports directly transmit vibrations to the inner pipe, causing hard collisions and friction between the inner and outer pipe walls, which can easily lead to damage over long-term operation. The flexible support 3 used in this invention, such as an annular bushing 31 made of rubber or PTFE, effectively absorbs and attenuates vibration energy with its elastic material. This allows slight deflection and displacement of the first inner pipe 21 and the second inner pipe 22 at the microscopic level. Through its groove 32, harmful rigid friction is transformed into flexible damping buffering, greatly reducing the risk of wear between the inner and outer pipes and extending the overall service life of the pipeline.

[0035] When one of the inner tubes, such as the first inner tube 21, fails due to corrosion, scaling, or accidental damage, maintenance personnel do not need to replace the entire composite pipe. The failed inner tube can be easily removed from the system piping by disconnecting it from the outer mother tube 1 using detachable pipe fittings 4 at both ends, such as quick-connect fittings, and replaced with a new inner tube. The other intact inner tube 22 and its connection to the outer mother tube 1 remain completely unaffected, significantly reducing maintenance costs, labor, and material waste.

[0036] The core function of the detection channel 5, formed by the annular space between the outer mother tube 1 and the inner tube, is to monitor the integrity of the inner tube. During normal operation, inert gas at a certain pressure is injected into this sealed channel through its interface 51 and then sealed. If any inner tube ruptures or experiences a minor leak, the medium transported within it will intrude into the detection channel 5, causing changes in the pressure or gas composition within the channel. A pressure sensor installed on interface 51 can sensitively detect these abnormal pressure fluctuations, thus issuing a leak alarm at an early stage. This provides crucial information for preventative maintenance and safe system operation, effectively preventing medium mixing, contamination, or system failure caused by inner tube leaks.

[0037] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A dual bore copper tube characterised in that, It includes an outer mother tube (1) and a first inner tube (21) and a second inner tube (22) disposed inside the outer mother tube (1). The first inner tube (21) and the second inner tube (22) are fixed to the inner wall of the outer mother tube (1) by flexible support members (3) distributed at intervals along the tube length direction. The first inner tube (21) and the second inner tube (22) are both constructed to be replaceable independently of the outer mother tube (1).

2. A dual bore copper pipe according to claim 1, wherein: The flexible support (3) is an annular bushing (31), whose outer wall is press-fitted with the inner wall of the outer mother tube (1), and whose inner wall is provided with a groove (32) that matches the shape of the first inner tube (21) and the second inner tube (22).

3. A dual bore copper pipe according to claim 2, wherein: The annular bushing (31) is made of rubber or polytetrafluoroethylene.

4. A dual bore copper pipe as claimed in claim 1, wherein: At least one end of the first inner tube (21) and the second inner tube (22) is configured to be connected to an external pipeline via a detachable pipe fitting (4), thereby enabling independent replacement.

5. A dual bore copper pipe according to claim 4, wherein: The pipe fitting (4) is a quick-connect fitting.

6. A double-diameter copper tube according to claim 1, characterized in that: The inner diameter of the first inner tube (21) is set to be equal to the inner diameter of the second inner tube (22).

7. A double-diameter copper tube according to claim 1, characterized in that: The annular space between the outer mother tube (1), the first inner tube (21), and the second inner tube (22) forms a sealed detection channel (5), which is provided with an interface (51) for filling inert gas and installing a pressure sensor.

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