Double-medium heat exchange tube

Abstract

The double-medium heat exchange tube comprises a first through tube and a second through tube, and the first through tube is extruded and embedded into the second through tube on the outer side of the second through tube; and a curved surface is arranged on the pipe wall of the second through pipe. The composite pipe wall is formed in the mode that the first through pipe is embedded into the second through pipe, and therefore the wall thickness of the first through pipe can be reduced under the condition that the same bearing strength is achieved. And the heat exchange area of the first through pipe and the second through pipe is ensured by embedding the first through pipe and the second through pipe, so that the heat exchange efficiency is ensured. Meanwhile, the curved surface is arranged to optimize the pipe wall structure, the bearing strength is improved, the fluid disturbance is increased, and the heat exchange efficiency is further improved. Therefore, on the premise that the bearing strength and the heat exchange efficiency are guaranteed, the wall thickness of the pipeline is effectively reduced, the requirement for pipeline materials is lowered, and the cost of the heat exchange pipe is lowered.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange, and in particular to a dual-medium heat exchange tube. Background Art

[0002] The heat exchange tube is the key structure of the refrigeration or heating device, and is the main structure for the refrigeration or direct heating device to exchange heat with the outside world.

[0003] Among them, heat exchange tubes are required in the carbon dioxide transcritical system. In the prior art, a multi-head spiral tube is usually placed inside an outer tube, and the channel formed between the outer tube and the inner tube is used to pass the carbon dioxide refrigerant. The pressure of the carbon dioxide refrigerant is relatively high, so both the outer tube and the spiral tube need to have sufficient wall thickness to ensure the pressure-bearing strength, and the spiral tube needs to be made of special nickel-white copper material, resulting in high material cost, complex processing, and large volume of the heat exchange tube. Summary of the invention

[0004] In order to solve the above problems in the prior art, the present invention provides a dual-medium heat exchange tube, which reduces the tube wall thickness while ensuring the pressure bearing strength and heat exchange efficiency.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] In a first aspect, the present invention provides a dual-medium heat exchange tube, comprising a first through tube and a second through tube, wherein the first through tube is extruded and embedded in the second through tube outside the second through tube;

[0007] A curved surface is arranged on the tube wall of the second through tube.

[0008] The beneficial effect of the present invention is that a composite tube wall is formed by embedding the first tube into the second tube, so that the wall thickness of the first tube can be reduced under the same pressure bearing strength. The embedding of the first tube and the second tube ensures the heat exchange area of ​​the two, thereby ensuring the heat exchange efficiency. At the same time, the tube wall structure is optimized by setting a curved surface, the pressure bearing strength is improved, and the fluid disturbance is increased, further improving the heat exchange efficiency. Therefore, the wall thickness of the pipeline can be effectively reduced under the premise of ensuring the pressure bearing strength and heat exchange efficiency, thereby reducing the requirements for pipeline materials and reducing the cost of the heat exchange tube.

[0009] Optionally, at least one set of curved surfaces is provided between two of the first through pipes.

[0010] According to the above description, at least one set of curved surfaces is provided between the two first through pipes, so that the fluid disturbance affects each heat exchange area more evenly, thereby improving the heat exchange efficiency.

[0011] Optionally, an exposed angle of the tube wall of the first through tube embedded in the second through tube is less than or equal to 80°.

[0012] Optionally, both the first through pipe and the second through pipe are heat-conducting metal pipes.

[0013] Optionally, the number of the first through pipes is more than 2.

[0014] Optionally, the fluid medium in the first through-tube is the same as or different from the fluid medium in the second through-tube.

[0015] Optionally, the dual-medium heat exchange tube can be coiled into a spiral coil.

[0016] It can be seen from the above description that the overall size of the dual-medium heat exchange tube can be reduced.

[0017] Optionally, the tube wall of the second through tube is square or circular as a whole.

[0018] Optionally, when the tube wall of the second through tube is square, the four sides of the second through tube are in arc transition. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic cross-sectional view of a dual-medium heat exchange tube according to Embodiment 1 of the present invention;

[0020] Figure 2 It is a cross-sectional schematic diagram of a dual-medium heat exchange tube according to the second embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 1. First pass pipe;

[0023] 2. Second through pipe; 21. Curved surface. DETAILED DESCRIPTION

[0024] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0025] Embodiment 1

[0026] Please refer to Figure 1 A dual-medium heat exchange tube includes a first through tube 1 and a second through tube 2. The first through tube 1 is extruded outside the second through tube 2 and embedded in the second through tube 2, thereby forming a composite tube wall, which can reduce the wall thickness of the first through tube 1 and ensure heat exchange efficiency.

[0027] In this embodiment, Figure 1 As shown, the tube wall of the second through tube 2 is circular as a whole.

[0028] In this embodiment, a curved surface 21 is provided on the tube wall of the second through tube 2. The curved surface 21 not only optimizes the tube wall structure and improves the pressure bearing strength, but also increases fluid disturbance, thereby improving heat exchange efficiency.

[0029] Reference Figure 1 It can be seen that at least one set of curved surfaces 21 is provided between the two first through pipes 1, that is, it can be one set of curved surfaces 21 or multiple sets of curved surfaces 21, so that the fluid disturbance affects each heat exchange area more evenly, thereby improving the heat exchange efficiency.

[0030] The curved surface 21 of this embodiment is a local wall that is misaligned with the overall wall shape of the second through tube 2. The local wall is regularly or irregularly present on the overall wall of the second through tube 2. A group of curved surfaces 21 may consist of one curved surface 21 or a plurality of curved surfaces 21. The curved surface 21 includes a plane with a curvature of 0. Figure 1 As shown, in this embodiment, the overall wall shape of the second through pipe 2 is circular. Figure 1 The protruding tube wall similar to the sharp corner is misaligned with the circle, so the local protruding tube wall is recorded as a group of curved surfaces 21, which includes two connected arc surfaces and two planes. In other embodiments, the group of curved surfaces 21 can also be wavy lines, arc protrusions, or other regular or irregular protrusions.

[0031] In this embodiment, the exposed angle of the tube wall of the first through tube 1 embedded in the second through tube 2 is 65°. In other embodiments, the exposed angle can be any angle less than or equal to 80°, such as 15°, 40°, 60°, etc. The exposed angle ensures that the composite tube wall formed by the two has corresponding pressure bearing strength and heat exchange area. At the same time, it also ensures that the exposed outer side of the first through tube 1 is flush with the overall tube wall of the second through tube 2 or the exposed outer side of the first through tube 1 is within the overall tube wall of the second through tube 2.

[0032] In this embodiment, the number of first through tubes 1 arranged around the second through tube 2 is 3. In other embodiments, the number of first through tubes 1 can be 2 or more, depending on the heat exchange requirements of the media inside the first through tubes 1 and the second through tubes 2, such as 2, 4, 5, etc.

[0033] In this embodiment, carbon dioxide refrigerant is introduced into the channel of the first through tube 1, and water is introduced into the channel of the second through tube 2. At this time, different fluid media are passed through the first through tube 1 and the second through tube 2. In other embodiments, one fluid medium is passed through the first through tube 1, and the same fluid medium can be passed through the second through tube 2. That is, the fluid medium in the first through tube 1 and the fluid medium in the second through tube 2 can be the same or different.

[0034] In this embodiment, the dual-medium heat exchange tube can be coiled into a spiral coil, and the cross section of the spiral coil can be circular like a spring or a racetrack, so as to reduce the overall size of the dual-medium heat exchange tube. In the process of coiling the dual-medium heat exchange tube, adjacent dual-medium heat exchange tube coils can be fitted or have gaps.

[0035] In this embodiment, the first through-tube 1 and the second through-tube 2 are both heat-conducting metal tubes.

[0036] Embodiment 2

[0037] Please refer to Figure 2 , a dual-medium heat exchange tube, based on the first embodiment, the tube wall of the second through tube 2 is square as a whole, and the four sides of the second through tube 2 are in arc transition.

[0038] For other details, please refer to Example 1.

[0039] It can be known from the above-mentioned embodiments 1 and 2 that in other equivalent embodiments, according to actual conditions, the entire tube wall of the second through tube 2 can also be an ellipse or other shapes.

[0040] In summary, this embodiment is improved by the combination of the first through pipe 1 and the second through pipe 2 and the pipe wall of the second through pipe 2 is optimized, thereby reducing the pipe wall thickness while taking into account both the pressure bearing strength and the heat exchange efficiency.

[0041] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0044] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0045] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. Dual-medium heat exchange tube, characterized in that: It comprises a first through pipe and a second through pipe, wherein the first through pipe is extruded outside the second through pipe and embedded in the second through pipe; A curved surface is arranged on the tube wall of the second through tube.

2. The dual-medium heat exchange tube according to claim 1, characterized in that: At least one set of curved surfaces is arranged between the two first through pipes.

3. The dual-medium heat exchange tube according to claim 1, characterized in that: The exposed angle of the tube wall of the first through tube embedded in the second through tube is less than or equal to 80°.

4. The dual-medium heat exchange tube according to claim 2, characterized in that: The first through pipe and the second through pipe are both heat-conducting metal pipes.

5. The dual-medium heat exchange tube according to any one of claims 1 to 4, characterized in that: The number of the first through pipes is 2 or more.

6. The dual-medium heat exchange tube according to any one of claims 1 to 4, characterized in that: The fluid medium in the first through-tube is the same as or different from the fluid medium in the second through-tube.

7. The dual-medium heat exchange tube according to any one of claims 1 to 4, characterized in that: The dual-medium heat exchange tube can be coiled into a spiral coil.

8. The dual-medium heat exchange tube according to any one of claims 1 to 4, characterized in that: The tube wall of the second through tube is square or circular as a whole.

9. The dual-medium heat exchange tube according to claim 8, characterized in that: When the tube wall of the second through tube is square, the four sides of the second through tube are in arc transition.

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