Self-adjusting heat exchange tube

Abstract

The utility model provides a self-adjusting heat exchange tube which comprises two end plates and a plurality of heat exchange tubes arranged between the two end plates in parallel, and the two ends of each heat exchange tube penetrate through the two end plates respectively. The heat exchange tube comprises a central finned tube, the two sides of the central finned tube are each fixedly connected with a first fixing tube, a second finned tube, a smooth tube and a second fixing tube are further sequentially arranged between the first fixing tubes and the end plates close to the first fixing tubes, and the second fixing tubes penetrate through the end plates and are connected with the connecting tubes. The first fixing pipe and the second finned pipe are movably connected through a first adjusting mechanism, and the second fixing pipe and the smooth pipe are movably connected through a second adjusting mechanism. According to the self-adjusting heat exchange tube, on the premise that the total length of the heat exchange tube is fixed, the heat exchange efficiency of the heat exchange tube can be controlled by adjusting the contact area between the second finned tube and the smooth tube and the fluid outside the heat exchange tube, and the flexibility and the working efficiency of the heat exchange tube are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchange equipment, in particular to a self-regulating heat exchange tube. Background Art

[0002] A heat exchanger is a device that transfers heat between two or more fluids at different temperatures. Through heat exchange, the fluids meet the process flow specifications and meet the process conditions. Heat exchange tubes are one of the core components of a heat exchanger and are a crucial location for fluid flow and heat exchange.

[0003] In existing technologies, heat exchange tubes are fixed in structure after being machined and formed, and accordingly, their heat exchange area and capacity are also determined. However, during actual use, the state of the fluid flowing through the tube fluctuates with changing operating conditions. Existing heat exchange tubes are unable to adjust their heat exchange capacity based on the fluid state while maintaining a constant total length, resulting in reduced heat exchange efficiency. Utility Model Content

[0004] The utility model provides a self-regulating heat exchange tube, which is used to solve the problem in the prior art that the heat exchange tube cannot self-regulate its heat exchange capacity under the condition that the total length of the heat exchange tube remains unchanged, resulting in reduced heat exchange efficiency.

[0005] The utility model provides a self-regulating heat exchange tube, characterized by comprising two end plates and a plurality of heat exchange tubes arranged in parallel between the two end plates, with the ends of the heat exchange tubes respectively passing through the two end plates. The heat exchange tube includes a central finned tube, with a first fixed tube fixedly connected to each side of the central finned tube. A second finned tube, a smooth tube, and a second fixed tube are sequentially arranged between the first fixed tube and the adjacent end plate. The second fixed tube passes through the end plate and is connected to the pipe. The first fixed tube and the second finned tube are movably connected via a first adjustment mechanism, and the second fixed tube and the smooth tube are movably connected via a second adjustment mechanism.

[0006] Optionally, the first fixed tube includes a first inner tube and a first outer tube, a first annular gap is formed between the first inner tube and the first outer tube, a first fixing ring is provided at one end of the first annular gap near the center finned tube, and the first inner tube and the first outer tube are fixedly connected via the first fixing ring. The first outer tube also has a sliding groove that fits with the fins on the second finned tube.

[0007] Optionally, the first adjustment mechanism includes a first spring located in the first annular gap, a thermal expansion member is installed between the first spring and the first fixing ring, and a first slider is installed on a side of the first spring away from the thermal expansion member. The cross section of the first slider is the same as the cross section of the second finned tube.

[0008] Optionally, the second fixed tube includes a second inner tube and a second outer tube, a second annular gap is formed between the second inner tube and the second outer tube, a second fixing ring is provided at one end of the second annular gap close to the end plate, and the second inner tube and the second outer tube are fixedly connected by the second fixing ring.

[0009] Optionally, the second adjustment mechanism includes a second spring located in the second annular gap, and a second sliding block is further provided on a side of the second spring away from the second fixing ring.

[0010] Optionally, spiral fins are further installed on the outer sides of the first fixed tube and the second fixed tube.

[0011] Optionally, the end plate is in the shape of a rectangle, and a connecting groove and a connecting slider are respectively provided on two long sides of the end plate, and the cross-sectional shape of the connecting groove and the connecting slider is the same.

[0012] Optionally, U-shaped tubes are connected between the inlets and outlets of the multiple heat exchange tubes.

[0013] The beneficial effects of the self-regulating heat exchange tube provided by the present invention include: 1. By setting the first regulating mechanism and the second regulating mechanism, the heat exchange efficiency of the heat exchange tube can be controlled by adjusting the contact area between the second finned tube and the smooth tube and the fluid outside the heat exchange tube under the premise that the total length of the heat exchange tube is fixed, thereby improving the flexibility and working efficiency of the heat exchange tube.

[0014] 2. By adding spiral fins to the outside of the first fixed tube and the second fixed tube, the overall heat exchange efficiency of the heat exchange tube can be further improved.

[0015] 3. By setting connecting grooves and connecting sliders on the two long sides of the end plate, multiple end plates and heat exchange tubes can be combined to increase the working load of the heat exchange tubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 A schematic structural diagram of the self-regulating heat exchange tube provided in Example 1 of the present utility model in a first working state;

[0018] Figure 2 A schematic structural diagram of the self-regulating heat exchange tube provided in Example 1 of the present utility model in the second working state;

[0019] Figure 3This is a schematic structural diagram of the self-regulating heat exchange tube provided in Example 1 of the utility model in the third working state;

[0020] Figure 4 A schematic structural diagram of the first adjustment mechanism provided in Example 1 of the present utility model;

[0021] Figure 5 A cross-sectional view of the first adjustment mechanism provided in Example 1 of the present utility model;

[0022] Figure 6 A schematic structural diagram of the second adjustment mechanism provided in Example 1 of the present utility model;

[0023] Figure 7 A cross-sectional view of the second adjustment mechanism provided in Example 1 of the present utility model;

[0024] Figure 8 A schematic structural diagram of the end plate provided in Example 2 of the present utility model;

[0025] Figure 9 This is a schematic structural diagram of the self-regulating heat exchange tube provided in Example 2 of the present utility model.

[0026] Description of reference numerals:

[0027] 1-end plate, 2-heat exchange tube, 11-connecting slide, 12-connecting slider, 21-center finned tube, 22-first fixed tube, 23-second finned tube, 24-smooth tube, 25-second fixed tube, 26-connecting tube, 27-U-shaped tube, 220-first inner tube, 221-first outer tube, 222-first annular gap, 223-first fixed ring, 224-sliding groove, 250-second inner tube, 251-second outer tube, 252-second annular gap, 253-second fixed ring, 310-first spring, 311-thermal expansion member, 312-first slider, 320-second spring, 321-second slider. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts also fall within the scope of protection of the present invention.

[0029] like Figure 1-3As shown, the present invention provides a self-regulating heat exchange tube, comprising two end plates 1 and a plurality of heat exchange tubes 2 arranged in parallel between the two end plates 1, with the ends of the heat exchange tubes 2 respectively extending through the two end plates 1. The heat exchange tubes 2 include a central finned tube 21, with a first fixed tube 22 fixedly connected to each side of the central finned tube 21. A second finned tube 23, a smooth tube 24, and a second fixed tube 25 are sequentially arranged between the first fixed tube 22 and the adjacent end plate 1. The second fixed tube 25 extends through the end plate 1 and is connected to a connecting pipe 26. The first fixed tube 22 and the second finned tube 23 are movably connected via a first adjustment mechanism, and the second fixed tube 25 and the smooth tube 24 are movably connected via a second adjustment mechanism.

[0030] When the self-regulating heat exchange tube is in operation, the end plates 1 at both ends of the heat exchange tube 2 are fixed, that is, the total length of the heat exchange tube 2 is fixed. During heat exchange operation, the first adjustment mechanism adjusts the expansion and contraction of the second finned tube 23 in the first fixed tube 22, and the second adjustment mechanism adjusts the expansion and contraction of the smooth tube 24 in the second fixed tube 25. When the second finned tube 23 extends from the first fixed tube 22 and the smooth tube 24 retracts into the second fixed tube 25, the fins on the second finned tube 23 increase the heat exchange area of ​​the heat exchange tube 2, thereby increasing the heat exchange efficiency of the heat exchange tube 2. Conversely, when the second finned tube 23 retracts into the first fixed tube 22 and the smooth tube 24 extends from the second fixed tube 25, the fins on the second finned tube 23 are hidden, the heat exchange area of ​​the heat exchange tube 2 is reduced, and the heat exchange efficiency is reduced.

[0031] From the perspective of overall fluid flow, the hot fluid flows into the heat exchange tube 2 from the connecting pipe 26 at the inlet end of the heat exchange tube 2, and flows through the connecting pipe 26, the second fixed tube 25, the smooth tube 24, the second finned tube 23, the first fixed tube 22, the center finned tube 21, the first fixed tube 22, the second finned tube 23, the smooth tube 24, the second fixed tube 25 in sequence, and finally flows out of the heat exchange tube 2 from the connecting pipe 26 at the outlet end to complete the heat exchange.

[0032] The self-regulating heat exchange tube provided by the present invention can control the heat exchange efficiency of the heat exchange tube 2 by adjusting the contact area between the second finned tube 23 and the smooth tube 24 and the external fluid of the heat exchange tube 2 under the premise that the total length of the heat exchange tube 2 is fixed, thereby improving the flexibility and working efficiency of the heat exchange tube 2.

[0033] like Figure 4 and Figure 5As shown, further, the first fixed tube 22 includes a first inner tube 220 and a first outer tube 221, and a first annular gap 222 is formed between the first inner tube 220 and the first outer tube 221. A first fixing ring 223 is provided at one end of the first annular gap 222 close to the center finned tube 21, and the first inner tube 220 and the first outer tube 221 are fixedly connected by the first fixing ring 223. The first outer tube 221 is also provided with a sliding groove 224 that fits with the fins on the second finned tube 23. Furthermore, the first adjustment mechanism includes a first spring 310 located in the first annular gap 222, a thermal expansion member 311 is installed between the first spring 310 and the first fixing ring 223, and a first slider 312 is also installed on the side of the first spring 310 away from the thermal expansion member 311. The cross-section of the first slider 312 is the same as the cross-section shape of the second finned tube 23.

[0034] The second finned tube 23 is inserted into the first annular gap 222 between the first inner tube 220 and the first outer tube 221, and into the sliding groove 224 on the first outer tube 221. The first fixing ring 223 is used to securely connect the first inner tube 220 and the first outer tube 221 to ensure the tightness of the first fixed tube 22. The first spring 310, the thermal expansion element 311, and the first slider 312 are all installed in the first annular gap 222. The process of the first adjustment mechanism adjusting the second finned tube 23 is as follows: when a hot fluid flows through the portion of the first fixed tube 22 where the thermal expansion element 311 is installed, if the temperature of the hot fluid is too high, the thermal expansion element 311 will expand due to the heat. Since the first fixing ring 223 is securely connected to the first inner tube 220 and the first outer tube 221, the expanded thermal expansion element 311 will squeeze the first spring 310, and the elastic potential energy generated by the first spring 310 will drive the movable first slider 312 to move. The movement of the first slider 312 will push the second finned tube 23 to extend from the first fixed tube 22 , thereby increasing the heat exchange area of ​​the heat exchange tube 2 .

[0035] like Figure 6 and Figure 7 As shown, the second fixed tube 25 further includes a second inner tube 250 and a second outer tube 251. A second annular gap 252 is formed between the second inner tube 250 and the second outer tube 251. A second fixing ring 253 is provided at one end of the second annular gap 252 close to the end plate 1. The second inner tube 250 and the second outer tube 251 are fixedly connected via the second fixing ring 253. Furthermore, the second adjustment mechanism includes a second spring 320 located in the second annular gap 252. A second slider 321 is also provided on the side of the second spring 320 away from the second fixing ring 253.

[0036] The second fixed tube 25 has a similar structure to the first fixed tube 22. A second annular gap 252 is formed between the second inner tube 250 and the second outer tube 251, allowing the smooth tube 24 to be inserted. A second fixing ring 253 secures the second inner tube 250 to the second outer tube 251, ensuring the tightness of the second fixed tube 25. A second spring 320 and a second slider 321 are located in the second annular gap 252 to control the movement of the smooth tube 24. The second adjustment mechanism controls the movement of the smooth tube 24 as follows: The smooth tube 24 is securely connected to the second finned tube 23. Therefore, when the second finned tube 23 is extended outward by the first adjustment mechanism, the smooth tube 24 is simultaneously retracted inward from the second fixed tube 25. The compression of the smooth tube 24 pushes the second slider 321, compressing the second spring 320 toward the second fixing ring 253. As the temperature of the hot fluid flowing through the thermal expansion element 311 decreases, the thermal expansion element 311 contracts, gradually returning the first spring 310 to its original position. At the same time, the second spring 320 pushes the second fixing ring 253, and the second fixing ring 253 pushes the smooth tube 24 to extend outward from the second fixing tube 25, and the second finned tube 23 enters the first fixing tube 22, and the heat exchange area of ​​the heat exchange tube 2 is reduced.

[0037] The first regulating mechanism and the second regulating mechanism cooperate with each other to realize self-regulation of the heat exchange area of ​​the heat exchange tube 2, thereby improving its heat exchange efficiency.

[0038] Furthermore, spiral fins are installed on the outer sides of the first fixed tube 22 and the second fixed tube 25 .

[0039] The outer sides of the first fixed tube 22 and the second fixed tube 25 are provided with spiral fins, which can further improve the overall heat exchange efficiency of the heat exchange tube 2 .

[0040] like Figure 8 and Figure 9 As shown, further, the end plate 1 is rectangular in shape, and a connecting chute 11 and a connecting slider 12 are respectively provided on the two long sides of the end plate 1. The connecting chute 11 and the connecting slider 12 have the same cross-sectional shape. Furthermore, a U-shaped tube 27 is connected between the inlets and outlets of the multiple heat exchange tubes 2.

[0041] The end plate 1 is configured as a rectangle, and connecting grooves 11 and connecting sliders 12 of the same cross-sectional shape are provided on its two long sides. When performing heat exchange operations with large flow rates, multiple end plates 1 can be connected through the connecting grooves 11 and connecting sliders 12, allowing multiple heat exchange tubes 2 to operate simultaneously, thereby improving heat exchange efficiency.

[0042] When it is necessary to increase the residence time of the hot fluid in the heat exchange tube 2 to fully cool the hot fluid or utilize its heat, two adjacent heat exchange tubes 2 can be connected through a U-shaped tube 27 to improve the utilization rate of the hot fluid heat or improve the efficiency of cooling it.

[0043] The present invention will be further described in detail below with reference to specific embodiments.

[0044] Example 1

[0045] like Figure 1-7 As shown, when the self-regulating heat exchange tube is working, it can be divided into three working states according to the temperature change of the hot fluid, namely, the second finned tube 23 is fully out, the smooth tube 24 is fully out, and the second finned tube 23 and the smooth tube 24 are simultaneously out.

[0046] When the temperature of the hot fluid flowing through the thermal expansion element 311 is high, the thermal expansion element 311 expands to its maximum, compressing the first spring 310. The elastic potential energy generated by the first spring 310 propels the movable first slider 312. The movement of the first slider 312 pushes the second finned tube 23 fully out of the first fixed tube 22 and compresses the smooth tube 24 completely into the second fixed tube 25. This is the first operating state, which has the largest heat exchange area.

[0047] When the temperature of the hot fluid flowing through the thermal expansion element 311 is low, the thermal expansion element 311 contracts to its minimum, and the first spring 310 gradually returns to its original position. Simultaneously, the second spring 320 pushes the second retaining ring 253, which pushes the smooth tube 24 outward from the second fixed tube 25, and the second finned tube 23 enters the first fixed tube 22. At this point, the smooth tube 24 completely extends from the second fixed tube 25, and the second finned tube 23 fully contracts into the first fixed tube 22. This is the second operating state, which has the smallest heat exchange area.

[0048] The third working state is that the thermal expansion member 311 expands partially. In this state, the smooth tube 24 and the second finned tube 23 extend partially to meet the requirements of fluid heat exchange.

[0049] Example 2

[0050] like Figure 8 and Figure 9 As shown, based on Example 1, Example 2 provides a device structure and specific operating process for a self-regulating heat exchange tube that can meet high flow loads: the end plate 1 is configured as a rectangle, and connecting grooves 11 and connecting sliders 12 of identical cross-sectional shapes are provided on its two long sides. When performing heat exchange operations with high flow rates, multiple end plates 1 can be connected through the connecting grooves 11 and connecting sliders 12, allowing multiple heat exchange tubes 2 to operate simultaneously, thereby improving heat exchange efficiency.

[0051] When it is necessary to increase the residence time of the hot fluid in the heat exchange tube 2 to fully cool the hot fluid or utilize its heat, two adjacent heat exchange tubes 2 can be connected through a U-shaped tube 27 to improve the utilization rate of the hot fluid heat or improve the efficiency of cooling it.

[0052] At the same time, spiral fins (not shown in the figure) can be installed on the outside of the first fixed tube 22 and the second fixed tube 25 to further improve the overall heat exchange efficiency of the heat exchange tube 2.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-regulating heat exchange tube, characterized in that: It comprises two end plates (1), and a plurality of heat exchange tubes (2) arranged in parallel between the two end plates (1), wherein both ends of the heat exchange tubes (2) respectively pass through the two end plates (1); The heat exchange tube (2) comprises a central finned tube (21), a first fixed tube (22) being fixedly connected to each side of the central finned tube (21), a second finned tube (23), a smooth tube (24) and a second fixed tube (25) being sequentially arranged between the first fixed tube (22) and the end plate (1) adjacent thereto, the second fixed tube (25) passing through the end plate (1) and being connected to the connecting pipe (26); The first fixed tube (22) and the second finned tube (23) are movably connected via a first adjusting mechanism, and the second fixed tube (25) and the smooth tube (24) are movably connected via a second adjusting mechanism.

2. The self-regulating heat exchange tube according to claim 1, characterized in that: The first fixed tube (22) comprises a first inner tube (220) and a first outer tube (221); a first annular gap (222) is formed between the first inner tube (220) and the first outer tube (221); a first fixing ring (223) is provided at one end of the first annular gap (222) close to the central fin tube (21); the first inner tube (220) and the first outer tube (221) are fixedly connected via the first fixing ring (223); The first outer tube (221) is also provided with a sliding groove (224) that fits with the fins on the second fin tube (23).

3. The self-regulating heat exchange tube according to claim 2, characterized in that: The first adjustment mechanism comprises a first spring (310) located in the first annular gap (222), a thermal expansion member (311) is installed between the first spring (310) and the first fixing ring (223), and a first slider (312) is also installed on a side of the first spring (310) away from the thermal expansion member (311); The cross section of the first slider (312) is the same as the cross section of the second fin tube (23).

4. The self-regulating heat exchange tube according to claim 1, characterized in that: The second fixed tube (25) comprises a second inner tube (250) and a second outer tube (251); a second annular gap (252) is formed between the second inner tube (250) and the second outer tube (251); a second fixing ring (253) is provided at one end of the second annular gap (252) close to the end plate (1); the second inner tube (250) and the second outer tube (251) are fixedly connected via the second fixing ring (253).

5. The self-regulating heat exchange tube according to claim 4, characterized in that: The second adjustment mechanism comprises a second spring (320) located in the second annular gap (252), and a second sliding block (321) is further provided on a side of the second spring (320) away from the second fixing ring (253).

6. The self-regulating heat exchange tube according to claim 1, characterized in that: Spiral fins are also installed on the outer sides of the first fixed tube (22) and the second fixed tube (25).

7. The self-regulating heat exchange tube according to claim 1, characterized in that: The end plate (1) is in the shape of a rectangle. A connecting chute (11) and a connecting slider (12) are respectively provided on the two long sides of the end plate (1). The connecting chute (11) and the connecting slider (12) have the same cross-sectional shape.

8. The self-regulating heat exchange tube according to claim 1, characterized in that: A U-shaped tube (27) is further connected between the inlets and outlets of the plurality of heat exchange tubes (2).

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