A dual-cavity structure for air conditioning pipes

Abstract

This utility model relates to the field of heat exchangers, specifically disclosing a double-cavity structure for air conditioning piping. It includes an inner tube, with an outer tube sleeved around its outer side. The outer wall of the inner tube and the inner wall of the outer tube are fitted together, forming several outer cavities. Both ends of the outer tube are connected to manifold heads. The middle section of the manifold head is cylindrical, tapering at one end to seamlessly connect with the outer tube, and tapering at the other end to fit tightly against the outer wall of the inner tube. This utility model cleverly integrates the high and low pressure piping of an air conditioning system by nesting the inner and outer tubes together. The circular inner cavity of the inner tube is used for flowing low-temperature liquid refrigerant, while the multiple outer cavities formed by the two tubes are used for flowing high-temperature, high-pressure refrigerant. This design allows the two different refrigerant states to exchange heat only through the inner tube wall, greatly improving heat exchange efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchangers, specifically a double-cavity structure for air conditioning pipes. Background Technology

[0002] In refrigeration and air conditioning systems, heat exchange efficiency is one of the key factors affecting overall energy efficiency and performance. To achieve efficient energy transfer within the system, heat exchange between refrigerants in different states is typically necessary. For example, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor may exchange heat with the low-temperature, low-pressure liquid refrigerant from the evaporator. This process effectively reduces the refrigerant temperature entering the condenser, improving the system's circulation efficiency. Traditionally, this type of heat exchange relies on independently installed plate or coaxial heat exchangers. While effective, these devices usually require additional piping and installation space, increasing system complexity, cost, and potential leakage points.

[0003] A common approach to improvement is to integrate high- and low-pressure pipelines together, using a shared pipe wall for heat exchange, thus forming a so-called "dual-pipe" or "inner-outer-pipe" structure. However, a significant drawback of existing integrated pipeline structures in practice is ensuring a stable and uniform gap or contact relationship between the inner and outer pipes during long-distance assembly to form a regular and continuous heat exchange channel. Inaccurate positioning or uneven fitting between the inner and outer pipes not only leads to distortion of the designed heat exchange channel (outer cavity) shape and inconsistent flow cross-sectional areas, affecting the uniformity of refrigerant flow and heat exchange stability, but may also affect the structural lifespan due to excessive local contact stress. This issue of assembly accuracy and structural stability restricts the reliability and performance optimization of integrated dual-cavity heat exchange pipelines. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a dual-cavity structure for air conditioning pipes. This solves the problem in the prior art where, when integrating high and low pressure pipes, the lack of effective and reliable positioning support between the inner and outer pipes leads to uneven heat exchange channel shape and poor flow stability, thus affecting heat exchange efficiency.

[0005] An air conditioning pipe with a double inner cavity structure includes an inner pipe, an outer pipe sleeved on the outside of the inner pipe, the outer wall of the inner pipe and the inner wall of the outer pipe fitting together and forming a plurality of outer cavities;

[0006] Both ends of the outer tube are connected to a manifold head. The middle section of the manifold head is a cylindrical structure, and one end of the manifold head is narrowed and seamlessly connected to the outer tube. The other end of the manifold head is narrowed and closely attached to the outer wall of the inner tube.

[0007] A guide pipe is also fixedly connected to the outer side of the middle section of the manifold head;

[0008] The inner cavity of the guide tube and the inner cavity of the collector head are interconnected, and several of the outer cavities are all connected to the inner cavity of the collector head.

[0009] Preferably, the outer cavity is one of a trapezoid, a triangle, or an inverted trapezoid.

[0010] Preferably, the inner tube is a round tube with a smooth outer wall;

[0011] The inner wall of the outer tube is fixed with several drainage ribs, which are closely attached to the outer wall of the inner tube.

[0012] Preferably, the outer tube is a round tube with a smooth inner wall;

[0013] The outer wall of the inner tube is fixed with several drainage ribs, which are closely attached to the inner wall of the outer tube.

[0014] Preferably, the guide tube is partially embedded inside the collector tube head, and a crease is formed at the position where it contacts the outer surface of the collector tube head.

[0015] Preferably, the guide tube and the collector tube head are fixed by welding.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] By nesting and fitting inner and outer pipes together, the high and low pressure piping of the air conditioning system is cleverly integrated. The circular inner cavity of the inner pipe is used for the flow of low-temperature liquid refrigerant, while the multiple outer cavities formed by the nested inner and outer pipes are used for the flow of high-temperature, high-pressure refrigerant. This design allows the two different refrigerant states to exchange heat only through the inner pipe wall, greatly improving heat exchange efficiency. The interconnected design of the end manifolds and guide pipes ensures the uniformity of refrigerant flow and smooth convergence within each outer cavity, thereby effectively improving the overall performance of the heat exchange unit.

[0018] This invention achieves efficient heat exchange of high and low pressure refrigerants within a compact space through a dual-cavity integrated structure design. The specific flow-guiding rib structure (flow-guiding rib one or flow-guiding rib two) effectively solves the alignment and fixation problems of the inner and outer pipes, improving product reliability. Combined with the high thermal conductivity and easy processing characteristics of aluminum alloy, this structure ensures excellent heat exchange performance while achieving lightweight and structural simplification of the air conditioning piping, demonstrating significant practical value. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0021] Figure 3This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0022] Figure 4 This is a structural schematic diagram of Embodiment 3 of the present invention.

[0023] In the diagram: 1. Inner tube; 2. Outer tube; 3. Outer cavity; 4. Manifold head; 5. Guide tube; 6. Drainage rib one; 7. Drainage rib two. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1 and Figure 2 As shown:

[0026] Example 1: This utility model provides a double inner cavity structure for an air conditioning pipe, including an inner pipe 1, an outer pipe 2 sleeved on the outside of the inner pipe 1, the outer wall of the inner pipe 1 and the inner wall of the outer pipe 2 are fitted together and formed with a plurality of outer cavities 3.

[0027] Both ends of the outer tube 2 are connected to a manifold head 4. The middle section of the manifold head 4 is a cylindrical structure, and one end of it gradually narrows and is seamlessly connected to the outer tube 2. The other end of it gradually narrows and is tightly attached to the outer wall of the inner tube 1.

[0028] A guide pipe 5 is also fixedly connected to the outer side of the middle section of the manifold head 4;

[0029] The inner cavity of the guide tube 5 and the inner cavity of the collector head 4 are interconnected, and several outer cavities 3 are all connected to the inner cavity of the collector head 4.

[0030] Specifically, the outer cavity 3 is one of the following shapes: trapezoidal, triangular, or inverted trapezoidal;

[0031] The guide tube 5 is partially embedded in the collector tube head 4, and a crease is formed at the position where it contacts the outer surface of the collector tube head 4.

[0032] Specifically, the guide pipe 5 and the collector pipe head 4 are fixed by welding.

[0033] As can be seen from the above, the dual-cavity structure of the air conditioning pipe provided by this utility model consists of an outer pipe 2 sleeved on the outside of the inner pipe 1, with the outer and inner walls of the two fitting together to form several outer cavities 3. Both ends of the outer pipe 2 are connected to a manifold head 4, which is seamlessly connected to the outer pipe 2 and tightly attached to the outer wall of the inner pipe 1, respectively. Furthermore, a guide pipe 5 fixedly connected to the outer side of the middle section of the manifold head 4 communicates with its inner cavity, thus connecting all the outer cavities 3 to the inner cavity of the manifold head 4.

[0034] This invention integrates the low-pressure pipe and the high-pressure pipe in the air conditioning pipeline to form a double-cavity structure. The circular inner cavity inside the inner pipe 1 is used for the flow of low-temperature liquid refrigerant, while the outer cavity 3, which is trapezoidal, triangular or inverted trapezoidal, is used for the flow of high-temperature and high-pressure refrigerant. Efficient heat exchange is achieved through the common cavity wall of the double inner cavities (the outer wall of the inner pipe 1).

[0035] In addition, the guide tube 5 is partially embedded in the collector tube head 4 and forms creases on the contact surface. The two are fixed by welding to ensure the stability and sealing of the connection.

[0036] This structure is made of aluminum alloy, which has the advantages of high thermal conductivity and easy molding. The overall structure is compact and effectively improves heat exchange performance.

[0037] Example 2: This example is basically the same as the previous example, except that, as Figure 3 As shown, inner tube 1 is a round tube with a smooth outer wall;

[0038] Several drainage ribs 6 are fixed on the inner wall of the outer tube 2, and the drainage ribs 6 are closely attached to the outer wall of the inner tube 1.

[0039] As can be seen from the above, this embodiment is a limitation based on the previous embodiment, and its inner tube 1 adopts a circular tube structure with a smooth outer wall. Correspondingly, a number of drainage ribs 6 are fixedly provided on the inner wall of the outer tube 2, and these drainage ribs 6 are closely attached to the smooth outer wall of the inner tube 1.

[0040] By adding the flow-guiding rib 6, the relative position and contact relationship between the inner wall of the inner tube 1 and the inner wall of the outer tube 2 are further defined and stabilized. The structure of the flow-guiding rib 6 enhances the assembly accuracy and stability of the overall double-cavity structure, which is beneficial to the flow and heat exchange process of the high-temperature and high-pressure refrigerant in the outer cavity 3. It is an important supplement to the high-efficiency heat exchange design of the previous embodiment.

[0041] Example 3: This example is basically the same as the previous example, except that, as Figure 4 As shown, outer tube 2 is a round tube with a smooth inner wall;

[0042] Several drainage ribs 7 are fixed on the outer wall of the inner tube 1, and the drainage ribs 7 are closely attached to the inner wall of the outer tube 2.

[0043] As can be seen from the above, this embodiment provides another implementation method, in which the outer tube 2 adopts a circular tube structure with a smooth inner wall. Correspondingly, several drainage ribs 7 are fixedly provided on the outer wall of the inner tube 1.

[0044] These drainage ribs 7 fit tightly against the smooth inner wall of the outer tube 2, thus determining the relative position of the inner tube 1 within the outer tube 2. Through the supporting and separating effect of the drainage ribs 7, a regular and interconnected outer cavity 3 is formed between the inner tube 1 and the outer tube 2.

[0045] This design corresponds in function to the previous embodiment but is structurally complementary. It also aims to ensure the alignment accuracy and contact reliability of the dual-cavity structure, providing a stable structural basis for the flow of refrigerant in their respective cavities and for heat exchange through the common cavity wall.

[0046] The embodiments of this utility model are given for the purpose of illustration and description. Although the embodiments of this utility model have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the utility model. Any changes, modifications, substitutions and variations made by those skilled in the art to the above embodiments within the scope of this utility model should be included within the protection scope of this utility model.

Claims

1. A dual-cavity structure for air conditioning pipes, characterized in that, It includes an inner tube (1), and an outer tube (2) is sleeved on the outside of the inner tube (1). The outer wall of the inner tube (1) and the inner wall of the outer tube (2) are fitted together and formed with several outer cavities (3). Both ends of the outer tube (2) are connected to a manifold head (4). The middle section of the manifold head (4) is a cylindrical structure, and one end of it is narrowed and seamlessly connected to the outer tube (2), while the other end of it is narrowed and closely attached to the outer wall of the inner tube (1). A guide pipe (5) is also fixedly connected to the outer side of the middle section of the manifold head (4); The inner cavity of the guide tube (5) and the inner cavity of the collector tube head (4) are interconnected, and several of the outer cavities (3) are connected to the inner cavity of the collector tube head (4).

2. The double-lumen structure of claim 1, wherein, The outer cavity (3) is one of the following: trapezoid, triangle, or inverted trapezoid.

3. The double-lumen structure of claim 1 or 2, wherein The inner tube (1) is a round tube with a smooth outer wall; The inner wall of the outer tube (2) is fixed with several drainage ribs (6), which are closely attached to the outer wall of the inner tube (1).

4. The double-lumen structure of claim 1 or 2, wherein The outer tube (2) is a round tube with a smooth inner wall; The outer wall of the inner tube (1) is fixed with several drainage ribs (7), which are closely attached to the inner wall of the outer tube (2).

5. The double-lumen structure of claim 1, wherein, The guide tube (5) is partially embedded in the collector tube head (4) and a crease is formed at the position where it contacts the outer surface of the collector tube head (4).

6. The dual lumen structure of claim 1, wherein, The guide pipe (5) and the collector pipe head (4) are fixed by welding.

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