Heat exchange tube, heat exchanger and air conditioning equipment

Abstract

The present disclosure relates to a heat exchange tube, a heat exchanger, and an air conditioning device. Among them, the heat exchange tube includes: a tube body; an outer fin located on the outer wall of the tube body and extending along the circumferential direction of the tube body; and one or more baffles located on the outer wall of the tube body and extending along the axial direction of the tube body. By providing one or more axially extending baffles on the outer wall of the tube, the baffles separate the circumferentially connected evaporation cavities to form a plurality of discontinuous evaporation enhancement cavities, effectively preventing the gas generated in the lower part of the evaporation cavity from flowing to the upper part and contacting the outer fin wall surface, thereby occupying the effective heat exchange area. Thus, the contact area between the refrigerant liquid and the outer fin wall surface is increased, and the utilization rate of the heat exchange area and the heat exchange efficiency are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning equipment, and particularly relates to a heat exchange tube, a heat exchanger, and an air conditioning equipment. Background Art

[0002] With the rapid economic development, refrigeration and air conditioning equipment have been widely used, which has promoted the research on high-efficiency heat exchangers. Heat exchangers made of enhanced heat exchange tubes can greatly reduce the volume of equipment and the number of copper tubes used, and reduce the cost. Therefore, the research and development of enhanced heat exchange tubes have received extensive attention.

[0003] A conventional flooded evaporator tube has a double-sided enhanced structure inside and outside the tube. During operation, the outside of the tube is immersed in liquid refrigerant. Fins are processed on the outside of the tube to form a circumferentially connected evaporation cavity. The liquid refrigerant absorbs heat and evaporates into small bubbles at the gasification core in the cavity. When the bubbles grow to a certain volume, they will escape from the gasification core and enter the evaporation cavity, and flow upward along the circumferential channel and continuously converge and grow, and finally break away from the evaporation cavity.

[0004] In existing evaporator tubes, under a large heat flux density, a large number of bubbles are generated. When the gas accumulates and flows upward in the circumferentially connected evaporation cavity, if the bubbles cannot be guided to break away from the cavity in time, the bubbles will occupy too much contact area between the refrigerant liquid in the cavity and the outer fin wall surface, resulting in the evaporation area of the heat exchange tube not being fully utilized and reducing the heat transfer efficiency of the heat exchanger. Summary of the Invention

[0005] After research by the inventor, it is found that the heat exchange tubes in the related art have the technical problem of low heat exchange efficiency.

[0006] In view of this, the embodiments of the present disclosure provide a heat exchange tube, a heat exchanger, and an air conditioning equipment, which can improve the assembly convenience.

[0007] Some embodiments of the present disclosure provide a heat exchange tube, including:

[0008] A tube body;

[0009] An outer fin, located on the outer wall of the tube body and extending along the circumferential direction of the tube body; and

[0010] One or more baffles, located on the outer wall of the tube body and extending along the axial direction of the tube body.

[0011] In some embodiments, the height of the baffle is not less than the height of the outer fin.

[0012] In some embodiments, the multiple baffles are arranged at equal intervals in the circumferential direction of the tube body.

[0013] In some embodiments, a plurality of baffle grooves are provided on both side walls of the baffle.

[0014] In some embodiments, the outer fins are helical and wound around the outer wall of the tube body.

[0015] In some embodiments, it further includes a plurality of fin top pieces bent relative to the top of the outer fins, and the fin top pieces and the outer fins form a structure similar to an L-shaped structure or a T-shaped structure.

[0016] In some embodiments, a circumferential gap is formed between any two circumferentially adjacent fin top pieces.

[0017] In some embodiments, an axial gap is formed between any two axially adjacent fin top pieces.

[0018] In some embodiments, a plurality of tube body grooves are formed on the outer wall of the tube body.

[0019] In some embodiments, it further includes one or more inner fin strips arranged on the inner wall of the tube body, and the inner fin strips are helical or annular.

[0020] In some embodiments, the range of the angle α between the inner fin strip and the axis line of the tube body is 0.1° to 90°.

[0021] Some embodiments of the present disclosure provide a heat exchanger, including the aforementioned heat exchange tube.

[0022] Some embodiments of the present disclosure provide an air conditioning device, including the aforementioned heat exchanger.

[0023] Therefore, according to the embodiments of the present disclosure, by providing one or more axially extending baffles on the outer wall of the tube, the baffles separate the circumferentially connected evaporation cavity to form a plurality of discontinuous evaporation enhancement cavities, effectively avoiding the gas generated in the lower part of the evaporation cavity from flowing to the upper part and contacting the outer fin wall surface, thus occupying the effective heat exchange area. Thereby, the contact area between the refrigerant liquid and the outer fin wall surface is increased, and the utilization rate of the heat exchange area and the heat exchange efficiency are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings forming a part of the specification depict embodiments of the present disclosure and, together with the specification, are used to explain the principles of the present disclosure.

[0025] Referring to the drawings, the present disclosure can be more clearly understood according to the following detailed description.

[0026] Wherein:

[0027] Figure 1 is a schematic three-dimensional structure diagram of some embodiments of the heat exchanger of the present disclosure;

[0028] Figure 2 is an axial sectional view of some embodiments of the heat exchanger of the present disclosure;

[0029] Figure 3It is a radial cross-sectional view of some embodiments of the heat exchanger of the present disclosure.

[0030] Description of Reference Numerals

[0031] 1. Tube body; 2. Outer fin; 3. Baffle; 4. Fin top piece; 5. Tube body groove; 6. Evaporation cavity; 7. Evaporation enhancement cavity; 8. Bubble detachment point; 9. Circumferential gap; 10. Axial gap; 11. Baffle groove; 12. Inner fin strip. Detailed Embodiments

[0032] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present disclosure or its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments herein. These embodiments are provided to make the present disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: Unless otherwise specifically stated, the relative arrangements of components and steps, the components of materials, numerical expressions and values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0033] The "first", "second" and similar terms used in the present disclosure do not denote any order, quantity or importance, but are merely used to distinguish different parts. Terms such as "comprising" or "including" mean that the elements before the term cover the elements listed after the term, and do not exclude the possibility of also covering other elements. Terms such as "upper", "lower", "left", "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0034] In the present disclosure, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to other devices without an intermediate device, or may not be directly connected to other devices but have an intermediate device.

[0035] All terms used in the present disclosure have the same meaning as understood by those of ordinary skill in the art to which the present disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in, for example, a general dictionary should be construed as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such here.

[0036] Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and devices should be regarded as part of the specification.

[0037] Combined Figures 1 to 3 As shown, some embodiments of the present disclosure provide a heat exchange tube, including: a tube body 1, external fins 2, and one or more baffles 3. Among them, the external fins 2 are located on the outer wall of the tube body 1 and extend circumferentially along the tube body 1, and the baffle 3 is located on the outer wall of the tube body 1 and extends axially along the tube body 1.

[0038] In this exemplary embodiment, as Figure 1 shown, the external fins 2 extending circumferentially along the tube body 1 can form a circumferentially connected evaporation cavity 6. The evaporation cavity 6 is a semi-closed structure. Bubbles are mainly generated at the gasification core in the cavity. When the bubbles break away from the gasification core and enter the evaporation cavity 6, their volume is small and not enough to overcome the liquid pressure to break away from the evaporation cavity. Therefore, under the action of buoyancy, they will flow upward in the semi-closed evaporation cavity and continuously converge and grow until they break away from the evaporation cavity. As Figure 1 and Figure 2 shown, by providing one or more axially extending baffles 3 on the outer wall of the tube body 1, the baffle 3 divides the circumferentially connected evaporation cavity 6 to form a plurality of discontinuous evaporation enhancement cavities 7. In the evaporation enhancement cavity 7, during the rising process of the bubbles, under the action of the baffle, they will finally converge under the baffle 3 at the highest position of the cavity and cannot continue to flow upward. The bubbles accumulate and grow at the convergence point and finally break through the liquid pressure and break away from the Figure 2 bubble detachment point 8 shown. In this way, it effectively avoids the gas generated in the lower part of the evaporation cavity from flowing to the upper part and contacting the outer fin wall surface, occupying the effective heat exchange area, increasing the contact area between the refrigerant liquid and the outer fin wall surface, and improving the heat exchange area utilization rate and heat exchange efficiency. In addition, in the discontinuous evaporation enhancement cavity 7, when the bubbles break away from the cavity under the baffle 3 at the highest position, a local negative pressure will be formed to accelerate the liquid replenishment of the cavity. Therefore, by forming a plurality of bubble detachment points 8 through the baffle 3, the liquid replenishment efficiency of the evaporation cavity can be effectively increased, and dry burning and waste of the heat exchange area caused by insufficient liquid replenishment capacity of the cavity can be avoided.

[0039] As Figure 1 shown, in some embodiments, a plurality of tube body grooves 5 are formed on the outer wall of the tube body 1. The tube body grooves 5 can increase the number of gasification cores required for bubble evaporation and enhance heat exchange.

[0040] To ensure heat exchange uniformity, in some embodiments, as Figure 2 shown, a plurality of baffles 3 are arranged at equal intervals in the circumferential direction of the tube body 1. Figure 2 A heat exchange tube with five blocking baffles 3 evenly arranged circumferentially is shown. According to the actual application working conditions, the number of processed baffles 3 is 1 to 100.

[0041] As Figure 2As shown, in some embodiments, the height of the baffle 3 is not less than the height of the outer fins 2. At this time, when the bubbles detach from the outer wall surface of the heat exchange tube on the side of the baffle 3, they will not enter the upper part of the discontinuous evaporation enhancement cavity, so as to achieve a better bubble flow blocking effect.

[0042] As Figure 1 and Figure 3 shown, in some embodiments, a plurality of baffle grooves 11 are provided on both side walls of the baffle 3 to increase the number of gasification cores in the evaporation cavity and enhance the heat exchange efficiency.

[0043] Regarding how the outer fins 2 form a circumferentially connected evaporation cavity 6, in some embodiments, the outer fins 2 are spiral and wound around the outer wall of the tube body 1. The spiral outer fins 2 are easy to process, have high heat exchange reliability, and have high feasibility. In some alternative embodiments, there are a plurality of outer fins and they are annular, and a circumferentially connected evaporation cavity is formed between two adjacent annular outer fins.

[0044] In some embodiments, there are 20 - 100 outer fins 2 per inch along the axial direction, and the height is 0.2 mm - 3 mm. In some other embodiments, the outer fins 2 and the tube body 1 are integrally formed, and the included angle between the outer fins 2 and the tube body 1 is a right angle to increase the number of gasification cores.

[0045] Combined with Figures 1 to 3 shown, in some embodiments, the heat exchange tube further includes a plurality of fin top sheets 4 bent relative to the top of the outer fins 2. The fin top sheets 4 and the outer fins 2 form a structure similar to an L shape or a T shape. An evaporation cavity 6 is formed between two axially adjacent outer fins 2, the outer wall surface of the tube body 1, and the fin top sheets, effectively improving the utilization rate of the heat exchange area and the heat exchange efficiency. In some embodiments, the outer fins 2 and the fin top sheets 4 are integrally formed structures, and the fin top sheets 4 are finally formed by squeezing the top of the outer fins 2 downward.

[0046] To improve the forming rate of the fin top structure, as Figure 1 shown, in some embodiments, a circumferential gap 9 is formed between any two circumferentially adjacent fin top sheets 4, that is, the knurling gap formed by circumferentially spaced knurling of the outer fins 2. In some embodiments, as Figure 1 shown, an axial gap 10 is formed between any two axially adjacent fin top sheets 4. The circumferential gap 9 and / or the axial gap 10 can form a bubble detachment point 8, facilitating the detachment of the bubbles from the heat exchange tube.

[0047] To further improve the heat exchange efficiency, in some embodiments, as Figure 1 and Figure 3As shown, the heat exchange tube further includes one or more internal fins 12 disposed on the inner wall of the tube body 1. In some embodiments, the internal fins 12 are helical. The internal fins 12 increase the heat exchange contact surface and improve the heat exchange efficiency. In other embodiments, the internal fins 12 are annular.

[0048] As Figure 3 shown, in some embodiments, the angle α between the internal fins 12 and the axis line of the tube body 1 ranges from 0.1° to 90° to obtain a higher heat exchange efficiency.

[0049] Some embodiments of the present disclosure provide a heat exchanger including the aforementioned heat exchange tube. The heat exchanger of the present disclosure accordingly also has the above beneficial technical effects.

[0050] Some embodiments of the present disclosure provide an air conditioning device including the aforementioned heat exchanger. The air conditioning device of the present disclosure accordingly also has the above beneficial technical effects.

[0051] So far, the embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description.

[0052] Although some specific embodiments of the present disclosure have been described in detail by way of examples, those skilled in the art should understand that the above examples are only for the purpose of illustration and not for limiting the scope of the present disclosure. Those skilled in the art should understand that the above embodiments can be modified or some technical features can be equivalently replaced without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A heat exchange tube, characterized in that, Comprising: A tube body (1); External fins (2), located on the outer wall of the tube body (1) and extending circumferentially along the tube body (1); One or more baffles (3), located on the outer wall of the tube body (1) and extending axially along the tube body (1), the height of the baffle (3) being not less than the height of the external fin (2); and A plurality of fin top sheets (4), the fin top sheets (4) being bent relative to the top of the external fin (2) and forming a L-shaped structure or a T-shaped structure with the external fin (2); Wherein, a circumferential gap (9) is formed between any two circumferentially adjacent fin top sheets (4), and / or an axial gap (10) is formed between any two axially adjacent fin top sheets (4).

2. The heat exchange tube according to claim 1, wherein, The plurality of baffles (3) are arranged at equal intervals in the circumferential direction of the tube body (1).

3. The heat exchange tube according to claim 1, wherein, A plurality of baffle grooves (11) are provided on both side walls of the baffle (3).

4. The heat exchange tube according to claim 1, characterized in that, The external fin (2) is spiral and wound around the outer wall of the tube body (1).

5. The heat exchange tube according to claim 1, characterized in that, A plurality of tube body grooves (5) are formed on the outer wall of the tube body (1).

6. The heat exchange tube according to claim 1, wherein It further includes one or more internal fin strips (12) provided on the inner wall of the tube body (1), the internal fin strips (12) being spiral or annular.

7. The heat exchange tube according to claim 1, wherein The included angle α between the internal fin strip (12) and the axis line of the tube body (1) ranges from 0.1° to 90°.

8. A heat exchanger, characterized in that, Comprising the heat exchange tube according to any one of claims 1 to 7.

9. An air conditioning device, characterized in that, Comprising the heat exchanger according to claim 8.

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