Finned tube heat exchanger, refrigeration system and refrigeration apparatus

Abstract

The utility model discloses finned tube heat exchanger, refrigerating system and refrigeration plant. Finned tube heat exchanger includes: first header and second header, a plurality of heat exchange pipes, a plurality of heat exchange pipes interval setting between first header and second header to constitute heat exchange core body, the first end of heat exchange pipe is connected with first header, the second end of heat exchange pipe is connected with second header, and heat exchange pipe is bent at least once to make the refrigerant flowing from one end of the first end and the second end of heat exchange pipe towards the other end at least change flow direction once, wherein the refrigerant does not flow upwards in the up-down direction and does not flow reversely in the horizontal direction, and fin, fin is located at at least one side of heat exchange core body. The finned tube heat exchanger of the utility model has the advantages of high heat exchange efficiency, good refrigerant circulation stability, strong adaptability, convenient arrangement, wide application range and the like.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, specifically to finned tube heat exchangers, and also to refrigeration systems and refrigeration equipment having the finned tube heat exchanger. Background Technology

[0002] Finned tube heat exchangers are one of the core components for heat transfer in refrigeration systems. A finned tube heat exchanger mainly consists of heat exchange tubes, fins, and manifolds. The heat exchange tubes are connected to the manifolds and provide refrigerant flow channels; the heat exchange tubes are also connected to the fins. The heat exchange tubes act as a bridge for heat transfer between the refrigerant and the fins / air. However, finned tube heat exchangers in related technologies suffer from low heat exchange efficiency. Utility Model Content

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a finned tube heat exchanger, a refrigeration system, and refrigeration equipment.

[0004] The finned tube heat exchanger of this utility model includes: a first manifold and a second manifold; a plurality of heat exchange tubes, which are spaced apart between the first manifold and the second manifold to form a heat exchange core, wherein a first end of each heat exchange tube is connected to the first manifold and a second end of each heat exchange tube is connected to the second manifold, and each heat exchange tube is bent at least once to change the flow direction of the refrigerant flowing from one end of the first end of the heat exchange tube toward the other end at least once, wherein the refrigerant does not flow upward in the vertical direction and does not flow backward in the horizontal direction; and fins, which are disposed on at least one side of the heat exchange core.

[0005] The finned tube heat exchanger of this invention has the advantages of high heat exchange efficiency, good refrigerant circulation stability, strong adaptability, easy layout, and wide application range.

[0006] Optionally, the first manifold and the second manifold extend horizontally parallel to each other, and are arranged vertically spaced apart; or the first manifold and the second manifold extend vertically parallel to each other, and are arranged horizontally spaced apart.

[0007] Optionally, the heat exchange tube includes a first horizontal section, a second horizontal section, and a vertical section. One end of the first horizontal section is connected to the first manifold, one end of the second horizontal section is connected to the second manifold, the upper end of the vertical section is connected to the other end of the first horizontal section, and the lower end of the vertical section is connected to the other end of the second horizontal section.

[0008] Optionally, the heat exchange tube further includes: a first inclined section, the upper end of which is connected to the other end of the first horizontal section, and the lower end of which is connected to the upper end of the vertical section; and / or a second inclined section, the upper end of which is connected to the lower end of the vertical section, and the lower end of which is connected to the other end of the second horizontal section.

[0009] Optionally, the multiple heat exchange tubes are divided into multiple heat exchange tube groups, which are arranged vertically. Each heat exchange tube group includes: an upper heat exchange tube, which includes a first horizontal section, a first inclined section, a vertical section, and a second horizontal section, which are connected in sequence; a lower heat exchange tube, which includes a first horizontal section, a vertical section, a second inclined section, and a second horizontal section, which are connected in sequence; and a middle heat exchange tube, which includes a first horizontal section, a first inclined section, a vertical section, a second inclined section, and a second horizontal section, which are connected in sequence.

[0010] Optionally, the first inclined section of the upper heat exchanger tube, the first inclined section of the middle heat exchanger tube, the second inclined section of the middle heat exchanger tube, and the second inclined section of the lower heat exchanger tube are parallel to each other.

[0011] Optionally, the angle between each of the first inclined section of the upper heat exchanger tube, the first inclined section of the middle heat exchanger tube, the second inclined section of the middle heat exchanger tube, and the second inclined section of the lower heat exchanger tube and the horizontal plane is greater than or equal to 26 degrees and less than or equal to 31 degrees.

[0012] Optionally, the heat exchange tube includes multiple horizontal sections and multiple vertical sections connected end to end in sequence; or the heat exchange tube includes at least two inclined sections connected end to end in sequence, and the inclination angles of adjacent inclined sections are different.

[0013] The refrigeration system of this utility model includes a first heat exchanger, a throttling device, and a second heat exchanger, wherein the first heat exchanger, the throttling device, and the second heat exchanger are connected in sequence, and at least one of the first heat exchanger and the second heat exchanger is the finned tube heat exchanger of this utility model.

[0014] The refrigeration system of this invention has the advantages of high heat exchange efficiency, good refrigerant circulation stability, strong adaptability, easy layout, and wide application range.

[0015] The refrigeration equipment of this utility model includes a compressor and a refrigeration system. The refrigeration system is the refrigeration system described in this utility model. The compressor, the first heat exchanger, the throttling device and the second heat exchanger of the refrigeration system are connected in sequence.

[0016] The refrigeration equipment of this invention has the advantages of high heat exchange efficiency, good refrigerant circulation stability, strong adaptability, easy layout, and wide application range. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a finned tube heat exchanger according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a finned tube heat exchanger according to another embodiment of the present invention; Figure 3 This is a schematic diagram of the heat exchange tube assembly of a finned tube heat exchanger according to an embodiment of the present utility model; Figure 4 This is a schematic diagram of the structure of a heat exchange tube in a finned tube heat exchanger according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure of another heat exchange tube of the finned tube heat exchanger according to an embodiment of the present utility model; Figure 6 This is a schematic diagram of a refrigeration system according to an embodiment of the present utility model; Figure 7 This is a schematic diagram of a refrigeration device according to an embodiment of the present utility model. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0019] The finned tube heat exchanger 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings. Figures 1-5 As shown, the finned tube heat exchanger 100 according to an embodiment of the present invention includes a first manifold 21, a second manifold 22, fins, and a plurality of heat exchange tubes 1. The plurality of heat exchange tubes 1 are spaced apart between the first manifold 21 and the second manifold 22 to form a heat exchange core 20. The fins are disposed on at least one side of the heat exchange core 20.

[0020] The first end 16 of the heat exchange tube 1 is connected to the first manifold 21, and the second end 17 of the heat exchange tube 1 is connected to the second manifold 22. The heat exchange tube 1 is bent at least once so that the refrigerant flowing from one end 16 or the second end 17 of the heat exchange tube 1 toward the other end changes its flow direction at least once. Specifically, the refrigerant does not flow upward in the vertical direction, and the refrigerant does not flow backward in the horizontal direction.

[0021] In other words, heat exchange tube 1 is bent downwards at least once, heat exchange tube 1 is not bent upwards, and heat exchange tube 1 is bent in only one direction in the horizontal direction.

[0022] For the upstream and downstream sections of the same heat exchanger tube 1, the downstream and upstream sections are located on the same horizontal plane, or the downstream section is located below the upstream section. When refrigerant flows in from the first manifold 21 and out from the second manifold 22, the downstream section is adjacent to the second manifold 22 relative to the upstream section, along the interval direction between the first manifold 21 and the second manifold 22. When refrigerant flows in from the second manifold 22 and out from the first manifold 21, the downstream section is adjacent to the first manifold 21 relative to the upstream section, along the interval direction between the first manifold 21 and the second manifold 22. The refrigerant flows through the upstream section first and then through the downstream section.

[0023] The following example, with the first manifold 21 and the second manifold 22 arranged at intervals in the left and right directions and the first manifold 21 located to the left of the second manifold 22, further explains the technical solution of this application and the term "no upward flow of refrigerant in the vertical direction and no reverse flow in the horizontal direction".

[0024] When the refrigerant flows in from the first manifold 21 and out from the second manifold 22, that is, when the refrigerant flows through the first manifold 21, the heat exchange tube 1 and the second manifold 22 in sequence, the refrigerant can flow horizontally to the right, vertically downward and inclined to the right and downward. The refrigerant cannot flow horizontally to the left, inclined to the left, vertically upward and inclined upward, that is, the refrigerant does not flow to the left.

[0025] When the refrigerant flows in from the second manifold 22 and out from the first manifold 21, that is, when the refrigerant flows through the second manifold 22, the heat exchange tube 1 and the first manifold 21 in sequence, the refrigerant can flow horizontally to the left, vertically downward, or inclined to the left and downward. The refrigerant cannot flow horizontally to the right, inclined to the right, vertically upward, or inclined upward, that is, the refrigerant does not flow to the right.

[0026] When the first manifold 21 and the second manifold 22 are arranged at intervals in the front-to-back direction, the flow direction of the refrigerant corresponds to the flow direction described above, and will not be described in detail again.

[0027] The following example, using the first manifold 21 and the second manifold 22 arranged at intervals in the vertical direction, further explains the technical solution of this application and the term "no upward flow of refrigerant in the vertical direction and no reverse flow in the horizontal direction".

[0028] When the first manifold 21 is above the second manifold 22 and the second end 17 of the heat exchange tube 1 is to the left of the first end 16, the refrigerant flows into the first manifold 21 and out of the second manifold 22. The refrigerant can flow horizontally to the left, vertically downward, or inclined downward to the left, but it cannot flow horizontally to the right, inclined to the right, vertically upward, or inclined upward; that is, the refrigerant does not flow to the right. When the second end 17 of the heat exchange tube 1 is to the right of the first end 16, the flow direction of the refrigerant in the left-right direction is opposite to the flow direction described above.

[0029] When the second manifold 22 is located above the first manifold 21, the refrigerant flows in from the second manifold 22 and out from the first manifold 21. The flow direction of the refrigerant corresponds to the flow direction described above, and will not be described in detail again.

[0030] According to an embodiment of the present invention, the finned tube heat exchanger 100 prevents refrigerant from accumulating at the bends of the heat exchange tube 1 by bending the heat exchange tube 1 at least once and ensuring no upward flow of the refrigerant. This prevents the formation of low-velocity regions due to abrupt changes in refrigerant flow direction and effectively reduces the risk of liquid refrigerant stagnation. This eliminates dead zones in refrigerant flow, allowing for smooth refrigerant flow and enabling heat exchange through conduction and convection, thereby effectively improving the refrigerant's heat exchange efficiency.

[0031] Furthermore, by bending the heat exchange tube 1 at least once and ensuring that the refrigerant does not flow upwards, the refrigerant maintains a downward flow trend throughout the entire process of the heat exchange tube 1, avoiding an upward climbing process against gravity, thus effectively reducing the flow resistance of the refrigerant. At the same time, it completely avoids the flow path layout of the refrigerant repeatedly going up and down within the heat exchange tube in existing designs, solving the persistent problem of refrigerant stagnation and accumulation in the heat exchange tube 1 from the source.

[0032] In addition, by using gravity to drive the flow of refrigerant, the gas-liquid two-phase flow can be made more stable, the distribution of refrigerant among multiple heat exchange tubes 1 can be more uniform, local drying out can be avoided, and supercooled areas can also be avoided.

[0033] The reduced and more uniform flow resistance of the refrigerant allows for a more stable refrigerant circulation, effectively ensuring the stability of the refrigerant circulation and significantly improving the reliability of oil return under evaporator operating conditions. Simultaneously, during variable frequency and variable load operation, the flow path of the finned tube heat exchanger 100 becomes less sensitive to flow fluctuations, significantly improving its robustness.

[0034] According to an embodiment of the present invention, the finned tube heat exchanger 100, by bending the heat exchange tube 1 at least once and ensuring no reverse flow of the refrigerant in the horizontal direction, eliminates the U-shaped and V-shaped bends in the heat exchange tube 1. Therefore, the finned tube heat exchanger 100 can be arranged substantially horizontally or substantially vertically, with no upward flow of the refrigerant. This makes the finned tube heat exchanger 100 easier to arrange and effectively expands its application range.

[0035] Therefore, the finned tube heat exchanger 100 according to the present utility model has the advantages of high heat exchange efficiency, good refrigerant circulation stability, strong adaptability, easy layout, and wide application range.

[0036] like Figures 1-5 As shown, the finned tube heat exchanger 100 includes a first manifold 21, a second manifold 22, fins, and multiple heat exchange tubes 1.

[0037] Optionally, the first manifold 21 and the second manifold 22 extend parallel to each other along a first direction, and the first manifold 21 and the second manifold 22 are arranged at intervals along a second direction, with the first direction orthogonal to the second direction. This makes it easier to arrange the finned tube heat exchanger 100, thereby further improving the application range of the finned tube heat exchanger 100.

[0038] like Figure 2 As shown, the first manifold 21 and the second manifold 22 extend horizontally parallel to each other, and the first manifold 21 and the second manifold 22 are arranged at intervals in the vertical direction.

[0039] like Figure 1 As shown, the first manifold 21 and the second manifold 22 extend parallel to each other in the vertical direction, and the first manifold 21 and the second manifold 22 are arranged at intervals in the horizontal direction.

[0040] For example, both the first manifold 21 and the second manifold 22 extend parallel to each other in the vertical direction, and are arranged alternately in the horizontal or front-back direction. Alternatively, both the first manifold 21 and the second manifold 22 extend parallel to each other in the horizontal or front-back direction, and are arranged alternately in the vertical direction. (The vertical direction is as follows...) Figure 1 and Figure 2 As shown by arrow A in the image, the left and right directions are as follows: Figure 1 and Figure 2 As shown by arrow B in the diagram.

[0041] The finned tube heat exchanger 100 can switch between a first state in which the first manifold 21 and the second manifold 22 extend horizontally and are spaced apart vertically, and a second state in which the first manifold 21 and the second manifold 22 extend vertically and are spaced apart horizontally.

[0042] like Figure 1 and Figure 3 As shown, the first manifold 21 and the second manifold 22 extend vertically parallel to each other, and are arranged horizontally spaced apart. The heat exchange tube 1 includes a first horizontal section 11, a second horizontal section 12, and a vertical section 13.

[0043] One end of the first horizontal section 11 is connected to the first manifold 21, and one end of the second horizontal section 12 is connected to the second manifold 22. That is, this end of the first horizontal section 11 constitutes the first end 16 of the heat exchange tube 1, and this end of the second horizontal section 12 constitutes the second end 17 of the heat exchange tube 1. The upper end of the vertical section 13 is connected to the other end of the first horizontal section 11, and the lower end of the vertical section 13 is connected to the other end of the second horizontal section 12.

[0044] This simplifies the structure of the heat exchange tube 1 and makes it easier to bend and shape. By setting the second horizontal section 12, when the refrigerant flows from the first manifold 21 to the second manifold 22, the second horizontal section 12 can buffer the refrigerant flowing out of the vertical section 13, reducing the refrigerant velocity and thus further improving the heat exchange efficiency and refrigerant circulation stability.

[0045] Furthermore, by providing a first horizontal section 11 and a second horizontal section 12 on both sides of the vertical section 13, it is possible not only to position the first horizontal section 11 above the second horizontal section 12, but also to ensure that the refrigerant flows from the first manifold 21 to the second manifold 22 (as shown in the image). Figure 1 and Figure 3 As shown), the second horizontal section 12 can be positioned above the first horizontal section 11, and the refrigerant can flow from the second manifold 22 to the first manifold 21, that is, the finned tube heat exchanger 100 is rotated 180 degrees around the horizontal direction.

[0046] After being rotated 180 degrees, the refrigerant in the heat exchange tubes 1 of the finned tube heat exchanger 100 does not flow upward in the vertical direction and does not flow backward in the horizontal direction. This allows the finned tube heat exchanger 100 to have more arrangement options and refrigerant flow directions, making it easier to arrange and further expanding its application range.

[0047] like Figure 1 and Figure 3As shown, the heat exchange tube 1 includes a first horizontal section 11, a second horizontal section 12, and an inclined section. The first horizontal section 11 is connected to the first manifold 21, and the second horizontal section 12 is connected to the second manifold 22. The inclined section connects the first horizontal section 11 and the second horizontal section 12.

[0048] This makes the structure of the heat exchange tube 1 simpler and easier to bend and form. It also allows the finned tube heat exchanger 100 to have more arrangement methods and refrigerant flow directions, making the finned tube heat exchanger 100 easier to arrange and further improving the application range of the finned tube heat exchanger 100.

[0049] like Figure 4 As shown, the heat exchange tube 1 includes multiple horizontal sections 19 and multiple vertical sections 13 connected end to end in sequence. This makes the structure of the heat exchange tube 1 simpler and easier to bend and form. It also allows the finned tube heat exchanger 100 to have more arrangement methods and refrigerant flow directions, making the finned tube heat exchanger 100 easier to arrange and further improving the application range of the finned tube heat exchanger 100.

[0050] like Figure 5 As shown, the heat exchange tube 1 includes at least two inclined sections 18 connected end to end in sequence, and the inclination angles of adjacent inclined sections 18 are different. This allows the refrigerant flow rate to gradually increase and the refrigerant to be buffered step by step, thereby further improving the heat exchange efficiency and the stability of the refrigerant circulation.

[0051] like Figure 1 and Figure 3 As shown, the heat exchange tube 1 also includes a first inclined section 14. The upper end of the first inclined section 14 is connected to the other end of the first horizontal section 11, and the lower end of the first inclined section 14 is connected to the upper end of the vertical section 13.

[0052] By setting the first inclined section 14, the flow rate of the refrigerant can be gradually increased when the refrigerant flows from the first manifold 21 to the second manifold 22, and the refrigerant can be gradually buffered when the refrigerant flows from the second manifold 22 to the first manifold 21, so that the flow rate of the refrigerant can be gradually reduced, thereby further improving the heat exchange efficiency and the stability of the refrigerant circulation.

[0053] like Figure 1 and Figure 3 As shown, the heat exchange tube 1 also includes a second inclined section 15. The upper end of the second inclined section 15 is connected to the lower end of the vertical section 13, and the lower end of the second inclined section 15 is connected to the other end of the second horizontal section 12.

[0054] By setting the second inclined section 15, the refrigerant can be gradually buffered when it flows from the first manifold 21 to the second manifold 22, so that the flow rate of the refrigerant can be gradually reduced. When the refrigerant flows from the second manifold 22 to the first manifold 21, the flow rate of the refrigerant can be gradually increased, thereby further improving the heat exchange efficiency and the stability of the refrigerant circulation.

[0055] Accordingly, when the heat exchange tube 1 includes the first inclined section 14 and the second inclined section 15, the flow rate of the refrigerant can be gradually increased regardless of whether the refrigerant flows from the first manifold 21 to the second manifold 22 or from the second manifold 22 to the first manifold 21. The refrigerant can also be gradually buffered so that the flow rate of the refrigerant can be gradually reduced, thereby further improving the heat exchange efficiency and the stability of the refrigerant circulation.

[0056] like Figure 1 and Figure 3 As shown, multiple heat exchange tubes 1 are divided into multiple heat exchange tube groups 10, which are arranged vertically. Each heat exchange tube group 10 includes an upper heat exchange tube 1a and a lower heat exchange tube 1b. The upper heat exchange tube 1a includes a first horizontal section 11, a first inclined section 14, a vertical section 13, and a second horizontal section 12, which are connected sequentially. The lower heat exchange tube 1b includes a first horizontal section 11, a vertical section 13, a second inclined section 15, and a second horizontal section 12, which are connected sequentially.

[0057] By setting up multiple heat exchange tube groups 10 arranged in the vertical direction, with each heat exchange tube group 10 including an upper heat exchange tube 1a and a lower heat exchange tube 1b, more refrigerant can flow through the finned tube heat exchanger 100, thereby further improving the heat exchange efficiency and refrigerant circulation stability of the finned tube heat exchanger 100.

[0058] Optionally, each heat exchanger tube assembly 10 further includes a central heat exchanger tube 1c, which comprises a first horizontal section 11, a first inclined section 14, a vertical section 13, a second inclined section 15, and a second horizontal section 12, connected sequentially. This allows more refrigerant to flow through the finned tube heat exchanger 100, thereby further improving the heat exchange efficiency and refrigerant circulation stability of the finned tube heat exchanger 100.

[0059] like Figure 1 and Figure 3As shown, the first inclined section 14 of the upper heat exchange tube 1a, the first inclined section 14 of the middle heat exchange tube 1c, the second inclined section 15 of the middle heat exchange tube 1c, and the second inclined section 15 of the lower heat exchange tube 1b are parallel to each other. This prevents the upper heat exchange tube 1a, the middle heat exchange tube 1c, and the lower heat exchange tube 1b of the heat exchange tube assembly 10 from interfering with each other, thus making the structure of the heat exchange tube assembly 10 and the finned tube heat exchanger 100 more reasonable.

[0060] Furthermore, the gaps between the upper heat exchanger tube 1a and the middle heat exchanger tube 1c, as well as between the middle heat exchanger tube 1c and the lower heat exchanger tube 1b, can be significantly reduced, allowing for the installation of more heat exchanger tubes 1. This not only effectively increases the heat exchange area of ​​the finned tube heat exchanger 100, thereby further improving its heat exchange efficiency, but also allows for a more uniform distribution of the refrigerant, resulting in a more stable refrigerant circulation and further enhancing the stability of the refrigerant circulation.

[0061] Optionally, the angle between each of the first inclined section 14 of the upper heat exchanger 1a, the first inclined section 14 of the middle heat exchanger 1c, the second inclined section 15 of the middle heat exchanger 1c, and the second inclined section 15 of the lower heat exchanger 1b and the horizontal plane is greater than or equal to 26 degrees and less than or equal to 31 degrees.

[0062] Therefore, while ensuring the acceleration and buffering performance of the first inclined section 14 and the second inclined section 15, the dimensions of the first inclined section 14 and the second inclined section 15 in the vertical direction can be reduced, thereby increasing the dimension of the vertical section 13 in the vertical direction. This allows for more effective use of gravity to drive the refrigerant flow, further reducing the refrigerant flow resistance, making the gas-liquid two-phase flow more stable, and the refrigerant distribution among the multiple heat exchange tubes 1 more uniform, thus making the refrigerant circulation volume more stable and further improving the refrigerant circulation stability.

[0063] like Figure 1 and Figure 3 As shown, the length of the first inclined section 14 of the upper heat exchanger tube 1a is greater than the length of the first inclined section 14 of the middle heat exchanger tube 1c. The length of the first inclined section 14 of the upper middle heat exchanger tube 1c is greater than the length of the first inclined section 14 of the lower middle heat exchanger tube 1c. The length of the second inclined section 15 of the lower middle heat exchanger tube 1c is greater than the length of the second inclined section 15 of the upper middle heat exchanger tube 1c. The length of the second inclined section 15 of the lower heat exchanger tube 1b is greater than the length of the second inclined section 15 of the middle heat exchanger tube 1c.

[0064] This prevents the upper heat exchange tube 1a, middle heat exchange tube 1c and lower heat exchange tube 1b of the heat exchange tube assembly 10 from interfering with each other, thus making the structure of the heat exchange tube assembly 10 and the finned tube heat exchanger 100 more reasonable.

[0065] Optionally, the finned tube heat exchanger 100 also includes a finned frame. The finned frame has a receiving space and has a first side and a second side opposite to each other. Fins are mounted on at least one side of the finned frame, and the heat exchange core is at least partially located within the receiving space. This allows for a more secure mounting of the fins, thereby making the structure of the finned tube heat exchanger 100 more stable.

[0066] This utility model also discloses a refrigeration system 1000. For example... Figure 6 As shown, the refrigeration system 1000 according to an embodiment of the present invention includes a first heat exchanger 300, a throttling device 400, and a second heat exchanger 500. The first heat exchanger 300, the throttling device 400, and the second heat exchanger 500 are connected in sequence. At least one of the first heat exchanger 300 and the second heat exchanger 500 is a finned tube heat exchanger 100.

[0067] Accordingly, the refrigeration system 1000 according to the present invention has advantages such as high heat exchange efficiency, good refrigerant circulation stability, strong adaptability, easy layout, and wide application range.

[0068] This utility model also discloses a refrigeration device. For example... Figure 7 As shown, the refrigeration equipment according to an embodiment of the present invention includes a compressor 2000 and a refrigeration system 1000. The compressor 2000, the first heat exchanger 300, the throttling device 400, and the second heat exchanger 500 are connected in sequence.

[0069] Accordingly, the refrigeration equipment according to the embodiments of this utility model has advantages such as high heat exchange efficiency, good refrigerant circulation stability, strong adaptability, easy layout, and wide application range.

[0070] In existing finned tube heat exchangers, the refrigerant flows back and forth. This creates a U-bend in the refrigerant flow path, where refrigerant tends to accumulate, obstructing its flow. Since heat exchange in a static state relies solely on conduction and cannot occur through convection, the heat exchange efficiency of the finned tube heat exchanger is relatively low.

[0071] Therefore, the U-bend in existing finned tube heat exchangers is not conducive to maximizing their heat exchange efficiency. At the same time, the refrigerant needs to flow back and forth, constantly overcoming the effects of gravity, which also increases the flow resistance of the refrigerant.

[0072] The finned tube heat exchanger 100 of this application has a new refrigerant flow path distribution method, which can avoid the formation of U-bends in the flow path, thereby avoiding the effect of refrigerant accumulation in the flow path and improving the heat exchange efficiency of the finned tube heat exchanger 100.

[0073] The finned tube heat exchanger 100 of this application achieves active utilization of gravity effects by reconstructing the flow path of the refrigerant, significantly optimizing the operational defects of existing finned tube heat exchangers. The innovation of the finned tube heat exchanger 100 includes forcing the refrigerant to follow a unidirectional top-down flow pattern in the heat exchange tube 1, completely avoiding the common flow path layout in existing finned tube heat exchangers where the refrigerant repeatedly zigzags up and down within the heat exchange tube. This gravity-guided flow mechanism fundamentally solves the persistent problem of liquid refrigerant stagnation and accumulation in local pipelines.

[0074] In existing finned tube heat exchangers, the refrigerant flow path often employs a multi-pass "U-shaped" or "serpentine" meandering design. When the two-phase refrigerant (gas-liquid mixture) flows through the upward-climbing tube section, gravity hinders the rise of the liquid refrigerant, causing liquid to accumulate at lower bends or the bottom of the climbing tube section. This not only reduces the effective heat exchange area but also creates a liquid seal effect, increasing flow resistance and hindering normal refrigerant circulation. Simultaneously, the heat exchange efficiency in the liquid accumulation area is extremely low, essentially creating a "cold energy dead zone" in the finned tube heat exchanger.

[0075] The flow path design of the finned tube heat exchanger 100 in this application achieves a breakthrough through the following mechanism: 1. Gravity-coordinated flow: After the refrigerant enters the heat exchange tube 1 of the finned tube heat exchanger 100, it maintains a downward flow trend. The liquid components naturally flow downward under the action of gravity, avoiding the climbing process against gravity.

[0076] 2. Eliminate flow dead zones: Unidirectional flow paths eliminate low-velocity regions caused by abrupt changes in flow direction in traditional designs, reducing the risk of liquid phase retention.

[0077] 3. Enhanced gas-liquid uniformity: Gravity-driven flow makes the gas-liquid two-phase flow more stable, and the refrigerant is distributed more evenly between heat exchange tubes 1, avoiding local dryness or overcooled areas.

[0078] The direct benefits of the finned tube heat exchanger 100 are reflected in at least three aspects: 1. Improved heat exchange efficiency: Elimination of liquid buildup allows the entire heat exchange tube 1 to fully participate in phase change heat transfer, thus improving the heat transfer capacity per unit area.

[0079] 2. Ensure circulation stability: The flow resistance of the refrigerant is reduced and the distribution is more even, resulting in a more stable refrigerant circulation volume, especially improving the reliability of oil return under evaporator operating conditions.

[0080] 3. Enhanced system adaptability: When operating under variable frequency and variable load conditions, the flow path of the finned tube heat exchanger 100 is less sensitive to refrigerant flow fluctuations, and the robustness of the finned tube heat exchanger 100 is significantly improved.

[0081] The finned tube heat exchanger 100 achieves efficient utilization of natural physical laws (gravity) through flow path topology reconstruction, providing a new technical path for improving the energy efficiency ratio (COP) and operational reliability of air conditioning systems.

[0082] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0083] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0084] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0085] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0086] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions 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 suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A finned tube heat exchanger, characterized in that, include: First manifold and second manifold; A plurality of heat exchange tubes are spaced apart between a first manifold and a second manifold to form a heat exchange core. A first end of each heat exchange tube is connected to the first manifold, and a second end of each heat exchange tube is connected to the second manifold. Each heat exchange tube is bent at least once to change the flow direction of the refrigerant flowing from one end to the other at least once, wherein the refrigerant does not flow upwards in the vertical direction and does not flow backwards in the horizontal direction. Fins, the fins being disposed on at least one side of the heat exchange core.

2. The finned tube heat exchanger according to claim 1, characterized in that, The first manifold and the second manifold extend horizontally parallel to each other, and are arranged vertically spaced apart; or The first manifold and the second manifold extend vertically parallel to each other, and are arranged horizontally spaced apart.

3. The finned tube heat exchanger according to claim 2, characterized in that, The heat exchange tube includes a first horizontal section, a second horizontal section, and a vertical section. One end of the first horizontal section is connected to the first manifold, one end of the second horizontal section is connected to the second manifold, the upper end of the vertical section is connected to the other end of the first horizontal section, and the lower end of the vertical section is connected to the other end of the second horizontal section.

4. The finned tube heat exchanger according to claim 3, characterized in that, The heat exchange tube also includes: A first inclined segment, the upper end of which is connected to the other end of the first horizontal segment, and the lower end of which is connected to the upper end of the vertical segment; and / or The second inclined segment has its upper end connected to the lower end of the vertical segment, and its lower end connected to the other end of the second horizontal segment.

5. The finned tube heat exchanger according to claim 4, characterized in that, The plurality of heat exchange tubes are divided into a plurality of heat exchange tube groups, the plurality of heat exchange tube groups are arranged in a vertical direction, and each heat exchange tube group includes: The upper heat exchange tube includes a first horizontal section, a first inclined section, a vertical section, and a second horizontal section, which are connected in sequence. The lower heat exchanger tube includes a first horizontal section, a vertical section, a second inclined section, and a second horizontal section, which are sequentially connected. The intermediate heat exchange tube includes a first horizontal section, a first inclined section, a vertical section, a second inclined section, and a second horizontal section, which are connected in sequence.

6. The finned tube heat exchanger according to claim 5, characterized in that, The first inclined section of the upper heat exchanger tube, the first inclined section of the middle heat exchanger tube, the second inclined section of the middle heat exchanger tube, and the second inclined section of the lower heat exchanger tube are parallel to each other.

7. The finned tube heat exchanger according to claim 6, characterized in that, The angle between each of the first inclined section of the upper heat exchanger tube, the first inclined section of the middle heat exchanger tube, the second inclined section of the middle heat exchanger tube, and the second inclined section of the lower heat exchanger tube and the horizontal plane is greater than or equal to 26 degrees and less than or equal to 31 degrees.

8. The finned tube heat exchanger according to claim 2, characterized in that, The heat exchange tube comprises multiple horizontal sections and multiple vertical sections connected end to end; or The heat exchange tube includes at least two inclined sections connected end to end in sequence, and the inclination angles of adjacent inclined sections are different.

9. A refrigeration system, characterized in that, It includes a first heat exchanger, a throttling device, and a second heat exchanger, wherein the first heat exchanger, the throttling device, and the second heat exchanger are connected in sequence, and at least one of the first heat exchanger and the second heat exchanger is a finned tube heat exchanger according to any one of claims 1-8.

10. A refrigeration device, characterized in that, It includes a compressor and a refrigeration system, wherein the refrigeration system is the refrigeration system according to claim 9, and the compressor, the first heat exchanger, the throttling device and the second heat exchanger of the refrigeration system are connected in sequence.

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