Heat exchanger

Abstract

The present application relates to the technical field of temperature control, and discloses a heat exchange device. The heat exchange device comprises a shell, at least one spiral heat exchange unit and at least one turbulence unit, one turbulence unit comprises multiple turbulence strips, wherein the spiral heat exchange unit is arranged in the shell, the turbulence unit is arranged in parallel on at least one side of the spiral heat exchange unit, and each turbulence strip in the turbulence unit is arranged in at least part of the side edge interval area between the upper and lower spiral pipelines of the spiral heat exchange unit according to a preset arrangement density. The present application improves the heat exchange efficiency of the heat exchange pipeline in the shell side of the heat exchange device, so that the heat exchange efficiency of the whole heat exchange pipeline is improved.

Description

Technical Field

[0001] This invention relates to the field of temperature control technology, and more particularly to a heat exchange device. Background Technology

[0002] A heat exchanger is an energy-saving device that facilitates heat transfer between two or more fluids at different temperatures. The performance of a heat exchanger primarily depends on its heat exchange rate, which in turn relies on the heat exchange pipes used for heat exchange. Currently, in spiral tube heat exchangers used in the heat pump field, straight metal tubes are typically wound into a spiral shape resembling a spring. This causes the liquid to flow in a spiral pattern throughout the shell side, rotating around a single heat transfer tube. The liquid in the bend generates secondary flow, known as Dean vortices. This phenomenon is caused by the momentum difference between the tube core and the tube wall due to centrifugal force. Dean vortices enhance the flow and heat transfer within the tube; the fluid flow between the spiral tubes also generates new disturbances. All of these effectively increase the convective heat transfer coefficient within the tube side, thereby improving thermal efficiency and achieving energy savings and reduced consumption.

[0003] However, for the entire heat exchanger, improving the heat transfer performance by simply increasing the convective heat transfer coefficient on the tube side has limited effectiveness. When the shell-side fluid in a spiral tube heat exchanger is a single-phase liquid, and the metal tubes are ordinary smooth tubes or other alloy tubes with low thermal conductivity, such as titanium tubes, the shell-side convective heat transfer coefficient is less than or much less than the tube-side convective heat transfer coefficient, resulting in a decrease in the overall heat transfer coefficient of the heat exchanger and its performance not being fully realized. Current methods for improving the shell-side convective heat transfer coefficient in spiral tube heat exchangers involve replacing the smooth tubes with externally threaded tubes or making them into twisted tubes. Despite this, the shell-side thermal resistance remains relatively high, and the shell-side convective heat transfer coefficient is still only one-tenth to one-half of the tube-side convective heat transfer coefficient. The enhanced heat transfer of the shell-side fluid is not very effective. In summary, the heat transfer efficiency of the heat exchange tubes in existing heat exchangers is low on the shell side, resulting in low overall heat transfer efficiency. Summary of the Invention

[0004] The main objective of this invention is to solve the technical problem that the heat exchange efficiency of the heat exchange tubes on the shell side of existing heat exchange devices is low, resulting in low overall heat exchange efficiency of the heat exchange tubes.

[0005] The present invention provides a heat exchange device, comprising: a shell, at least one spiral heat exchange unit and at least one turbulence unit, wherein the turbulence unit comprises multiple turbulence strips, wherein the spiral heat exchange unit is disposed within the shell, the turbulence unit is disposed parallel to at least one side of the spiral heat exchange unit, and each turbulence strip in the turbulence unit is disposed in at least a portion of the side spacing region between the upper and lower spiral pipes of the spiral heat exchange unit according to a preset arrangement density.

[0006] Optionally, in a first implementation of the first aspect of the present invention, the heat exchange device includes a plurality of spiral heat exchange units, the housing includes an inner housing and an outer housing, wherein the plurality of spiral heat exchange units are disposed between the inner housing and the outer housing, and at least one turbulence unit is disposed between the inner housing and an adjacent spiral heat exchange unit, between the outer housing and an adjacent spiral heat exchange unit, and / or between two adjacent spiral heat exchange units.

[0007] Optionally, in a second implementation of the first aspect of the present invention, the turbulence unit further includes a spacer bar. The first part of the spacer bar is disposed in the intermediate interval region between the upper and lower spiral pipes of the spiral heat exchange unit, for fixing the upper and lower spiral pipes of the spiral heat exchange unit. The second part of the spacer bar is disposed in the intermediate isolation region between every two adjacent turbulence bars, for fixing the two adjacent turbulence bars together. The first part and the second part of the spacer bar are respectively fixedly connected to or detachably connected to the turbulence bars.

[0008] Optionally, in a third implementation of the present invention, each of the turbulence strips is configured according to the spiral direction, angle, and pitch of the upper and lower spiral pipes in the spiral heat exchange unit.

[0009] Optionally, in a fourth implementation of the present invention, the cross-sectional shape of the spoiler is a circle, a right-angled triangle, or an equilateral triangle, wherein when the cross-sectional shape of the spoiler is a right-angled triangle or an equilateral triangle, one of the planes of the spoiler is arranged parallel to the shell.

[0010] Optionally, in a fifth implementation of the present invention, at least one flow guide groove is provided on the side of the turbulence strip near the spiral heat exchange unit.

[0011] Optionally, in the sixth implementation of the present invention, the equivalent diameter of each of the baffle strips is set to 3 mm, the arrangement density is set to full row, and the diameter of the guide groove is set to a semicircle of 1 mm.

[0012] When the cross-sectional shape of the spoiler strip is circular or equilateral triangle, the length of each segment of the spoiler strip is set to be greater than or equal to 27mm and less than or equal to 67.5mm;

[0013] When the cross-sectional shape of the spoiler strip is a right triangle, the length of each segment of the spoiler strip is set to be greater than or equal to 27 mm and less than or equal to 40.5 mm.

[0014] Optionally, in a seventh implementation of the present invention, the cross-sectional shape of each of the deflector strips is set to be circular and the length is set to 67.5 mm.

[0015] Optionally, in the eighth implementation of the present invention, the spiral heat exchange unit is made of copper or titanium and is a spiral pipe with external threads or twists.

[0016] Optionally, in the ninth implementation of the present invention, the spiral heat exchange unit is made of copper or titanium and is a spiral pipe with external threads or twists.

[0017] The technical solution provided by this invention includes a heat exchange device comprising a shell, at least one spiral heat exchange unit, and at least one turbulence unit. Each turbulence unit comprises multiple turbulence strips. The spiral heat exchange unit is disposed within the shell, and the turbulence units are arranged parallel to at least one side of the spiral heat exchange unit. Each turbulence strip in the turbulence unit is arranged at a predetermined density in at least a portion of the side spacing region between the upper and lower spiral pipes of the spiral heat exchange unit. This invention improves the heat exchange efficiency of the heat exchange tubes on the shell side of the heat exchange device, thereby enhancing the overall heat exchange efficiency of the heat exchange tubes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the first embodiment of the heat exchange device in this invention;

[0019] Figure 2 This is a schematic diagram of a second embodiment of the heat exchange device in this invention;

[0020] Figure 3 This is a schematic diagram of a third embodiment of the heat exchange device in this invention;

[0021] Figure 4 This is a schematic diagram of the fourth embodiment of the heat exchange device in this invention;

[0022] Figure 5 This is a schematic diagram of the fifth embodiment of the heat exchange device in this invention;

[0023] Figure 6 This is a schematic diagram of the sixth embodiment of the heat exchange device in this invention. Detailed Implementation

[0024] This invention provides a heat exchange device comprising a shell, at least one spiral heat exchange unit, and at least one turbulence-disrupting unit. Each turbulence-disrupting unit includes multiple turbulence-disrupting segments. The spiral heat exchange unit is disposed within the shell, and the turbulence-disrupting units are arranged parallel to at least one side of the spiral heat exchange unit. Each turbulence-disrupting segment in the turbulence-disrupting unit is arranged at a predetermined density in at least a portion of the side spacing region between the upper and lower spiral pipes of the spiral heat exchange unit. This invention improves the heat exchange efficiency of the heat exchange tubes on the shell side of the heat exchange device, thereby enhancing the overall heat exchange efficiency of the heat exchange tubes.

[0025] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” or “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] For ease of understanding, the basic hardware structure of the embodiments of the present invention is described below. Please refer to [link / reference]. Figure 1 One embodiment of the heat exchange device in this invention includes: a shell 1, at least one spiral heat exchange unit 2 and at least one turbulence unit 3. The turbulence unit 3 includes multiple turbulence strips 31. The spiral heat exchange unit 2 is disposed in the shell, and the turbulence unit 3 is disposed parallel to at least one side of the spiral heat exchange unit 2. Each turbulence strip 31 in the turbulence unit 3 is disposed in at least a portion of the side spacing area between the upper and lower spiral pipes of the spiral heat exchange unit 2 according to a preset arrangement density.

[0027] In this embodiment, as Figure 1 As shown, for example, a turbulence unit can be arranged in parallel inside the spiral heat exchange unit. The turbulence unit can be a turbulence strip with a circular cross-section. It is then arranged in a full row density in the side gap area between every two adjacent spiral pipes of the spiral heat exchange unit, and is set at the same vertical position between every two spiral pipes, so as to turbulently turbulent the shell-side fluid of the spiral pipe and increase the longitudinal turbulence intensity of the water flow in the heat exchange process.

[0028] In one embodiment, the turbulence unit 3 further includes a spacer (32+33). The first part 32 of the spacer is disposed in the intermediate interval area between the upper and lower spiral pipes of the spiral heat exchange unit 2, and is used to fix the upper and lower spiral pipes of the spiral heat exchange unit 2. The second part 33 of the spacer is disposed in the intermediate isolation area between every two adjacent turbulence strips 31, and is used to fixally connect every two adjacent turbulence strips 31. The first part 32 and the second part 33 of the spacer are fixedly connected to or detachably connected to the turbulence strips 31, respectively.

[0029] In this embodiment, as Figure 1As shown, a single flow-dispersing unit can include multiple flow-dispersing strips and corresponding spacers. The first part of the spacer is mainly used to separate the upper and lower spiral pipes, ensuring equal spacing between them, while also increasing the strength of the spiral pipes and preventing deformation caused by water flow impact during manufacturing and heat exchange. The first part of the spacer can be embedded in the intermediate gap between the upper and lower spiral pipes. The second part of the spacer is mainly used to fix the position of all the flow-dispersing strips, enabling them to effectively turbulentize the fluid on the shell side of the spiral pipes longitudinally.

[0030] In one embodiment, the heat exchange device includes a plurality of spiral heat exchange units, and the housing includes an inner housing and an outer housing. The plurality of spiral heat exchange units 2 are disposed between the inner housing and the outer housing, and at least one turbulence-inducing unit 3 is disposed between the inner housing and an adjacent spiral heat exchange unit 2, between the outer housing and an adjacent spiral heat exchange unit 2, and / or between two adjacent spiral heat exchange units 2. Figure 2 As shown, the turbulence unit 3 is simultaneously disposed between the two spiral heat exchange units and between the outer shell and the spiral heat exchange unit.

[0031] In one embodiment, each of the aforementioned baffle strips is configured according to the spiral direction, angle, and pitch of the upper and lower spiral pipes within the spiral heat exchange unit. This means that if each layer of spiral pipes is parallel to each other, then the upper and lower spiral pipes and the corresponding baffle strips are in a parallel relative position, and each baffle strip is also parallel to each other.

[0032] In one implementation, such as Figure 1 , Figure 3 and Figure 4 As shown, the cross-sectional shape of the spoiler is circular (spoiler 31), right-angled triangle (spoiler 34), or equilateral triangle (spoiler 35). When the cross-sectional shape of the spoiler is a right-angled triangle or equilateral triangle, one plane of the spoiler is parallel to the housing 1. Figure 4 As shown, one of the planes of the right-angled triangle (baffle strip 34) or equilateral triangle (baffle strip 35) is set parallel to the shell 1 in order to maximize the flow of water towards the spiral pipe shell side of the spiral heat exchange unit 2 during the heat exchange process, thereby improving the heat exchange efficiency.

[0033] In one implementation, such as Figure 5As shown, at least one guide groove 36 is provided on the side of the baffle 3 near the spiral heat exchange unit 2, for example, four guide grooves are provided to increase the flow guiding efficiency. In practical applications, the guide groove of the baffle refers to the baffle being cut off in a certain shape in the transverse section perpendicular to the shell or spiral heat exchange unit, for example, the baffle can be made into a sawtooth structure. The guide groove allows a portion of the water flow to pass directly, reducing the obstruction effect of the baffle on the water flow.

[0034] In one embodiment, the equivalent diameter of each segment of the spoiler strip is set to 3 mm, the arrangement density is set to full row, and the diameter of the guide groove is set to a semicircle of 1 mm; when the cross-sectional shape of the spoiler strip is a circle or an equilateral triangle, the length of each segment of the spoiler strip is set to be greater than or equal to 27 mm and less than or equal to 67.5 mm; when the cross-sectional shape of the spoiler strip is a right triangle, the length of each segment of the spoiler strip is set to be greater than or equal to 27 mm and less than or equal to 40.5 mm.

[0035] In this embodiment, the length of the baffle strip refers to the curve length between the two endpoints of the baffle strip; the equivalent diameter of the baffle strip is obtained by dividing the volume of the baffle strip by four times its unit length by the outer surface area of ​​the baffle strip's outer side; the arrangement density of the baffle strips refers to the number of layers of spiral pipes between the baffle strips when they are arranged at the same vertical position relative to the spiral heating unit. When the arrangement density is full row, the baffle strips are placed between every two layers of spiral pipes; the diameter of the baffle strip's guide groove is the diameter corresponding to a circular cross-section converted to the same area. Figure 6 As shown, interval 1 refers to a layer of spiral tube between two adjacent spoiler strips, which is a full row (spoiler strip 37); interval 2 refers to two layers of spiral tube between two adjacent spoiler strips (spoiler strip 38).

[0036] In this embodiment, when evaluating the heat exchange efficiency of the heat exchange device, turbulence units with different structural parameters are installed in the heat exchange device, and their heat exchange performance is compared with that of a heat exchange device with the same conditions except for the absence of turbulence units. Based on the comparison results, the effect of turbulence units with different structural parameters on improving the heat exchange efficiency of the heat exchange device is determined. The evaluation index of heat exchange efficiency is: the ratio of the heat exchange capacity of the heat exchange device with turbulence units to that without turbulence units, and the ratio of the water flow resistance. The ratio of the heat exchange capacity is divided by the third power of the ratio of the water flow resistance. If the evaluation index is greater than 1, the heat exchange device with turbulence units is determined to be better, with higher heat exchange performance under the same flow resistance. At the same time, the larger the evaluation index, the greater the improvement in heat exchange efficiency of the heat exchange device by the turbulence unit with the corresponding structural parameters.

[0037] Specifically, the preferred baffles are those with an equivalent diameter of 3 mm, an arrangement density of full row, and a flow density of 1 mm. When the length of the right-angled triangular baffles is greater than or equal to 27 mm and less than or equal to 40.5 mm, the heat exchange efficiency increases with the increase of the baffle length. When the length of the equilateral triangular and circular baffles is greater than or equal to 27 mm and less than or equal to 67.5 mm, the heat exchange efficiency increases with the increase or decrease of the baffle length.

[0038] Specifically, since the circular and equilateral triangular baffles are set between the upper and lower spiral pipes, when the liquid is turbulent, it can fully exchange heat with the spiral pipes on both sides of the baffles. The longer the baffles are, the better their heat exchange index and the better their heat exchange effect.

[0039] Specifically, when the length of the right-angled triangular baffle is in the range of 27mm-40.5mm, the baffle's turbulence effect can be increased with increasing length. However, when the length is in the range of 40.5mm-67.5mm, the right-angled portion of the baffle needs to be placed closer to one side of the spiral pipe, rather than being symmetrically designed relative to the spiral pipe. This results in poorer heat transfer performance for the spiral pipe closer to the right angle. Therefore, in the 40.5mm-67.5mm range, increasing the length of the baffle does not necessarily reduce its heat transfer performance.

[0040] Specifically, the heat exchange effect of the baffle strip is better than that without the baffle strip after the addition of the guide groove. The reason is that after the addition of the guide groove, when the liquid passes through the baffle strip, part of the liquid passes through the baffle groove and directly connects to the upper flow space between the upper baffle strips, and it still maintains a high temperature; the remaining liquid does not pass through the baffle groove, but forms turbulence through the baffle strip, and fully contacts the spiral pipe for heat exchange. The two different liquids mix between the baffle strips, which can keep the water temperature in the spiral pipe at a high temperature, thereby maintaining the high heat exchange index of the spiral pipe and improving the heat exchange efficiency.

[0041] Specifically, the arrangement density of the baffles in a full-displacement configuration makes the heat exchange efficiency of the spiral pipe better than that of a configuration with a spacing of 2 or more. It can be understood that when the baffles are fully displaced, their arrangement density within the spiral pipe is high. When the liquid exchanges heat with the spiral pipe, the baffles impede the flow, especially when the baffles are arranged with close spacing, allowing for sufficient heat exchange between the liquid and the spiral pipe.

[0042] In one embodiment, each segment of the spoiler strip has a circular cross-sectional shape and a length of 67.5 mm.

[0043] In this embodiment, the circular baffle strip, with a length of 67.5 mm, a diameter of 3 mm, and a total diameter of 1 mm for both the entire section and the guide groove, is long enough to ensure that the water flow is sufficiently turbulent as it passes through most of the spiral pipe cross-section. Simultaneously, the high density of the entire section allows the baffle strip to intercept the flow in each spiral cavity, thus achieving enhanced heat transfer within the spiral pipe. Under these conditions, the baffle strip is treated with a guide groove, enabling the water path to achieve similar heat transfer performance while reducing the obstruction effect of the baffle strip on the water. This improves upon the high water resistance drawback of not using a guide groove, thereby enhancing the heat transfer performance.

[0044] In one embodiment, the spiral heat exchange unit is made of copper or titanium and is a spiral pipe with external threads or twists.

[0045] In this embodiment of the invention, the heat exchange device includes a shell, at least one spiral heat exchange unit, and at least one turbulence unit. Each turbulence unit comprises multiple turbulence strips. The spiral heat exchange unit is disposed within the shell, and the turbulence units are arranged parallel to at least one side of the spiral heat exchange unit. Each turbulence strip in the turbulence unit is arranged at a predetermined density in at least a portion of the side spacing region between the upper and lower spiral pipes of the spiral heat exchange unit. This invention improves the heat exchange efficiency of the heat exchange tubes on the shell side of the heat exchange device, thereby enhancing the overall heat exchange efficiency of the heat exchange tubes.

[0046] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A heat exchange device, characterized in that, The heat exchange device includes a shell, at least one spiral heat exchange unit and at least one turbulence unit. Each turbulence unit includes multiple turbulence strips. The spiral heat exchange unit is disposed in the shell. The turbulence unit is disposed parallel to at least one side of the spiral heat exchange unit. Each turbulence strip in the turbulence unit is disposed in at least a portion of the side spacing area between the upper and lower spiral pipes of the spiral heat exchange unit according to a preset arrangement density. The turbulence unit also includes a spacer. The first part of the spacer is disposed in the middle interval area between the upper and lower spiral pipes of the spiral heat exchange unit, and is used to fix the upper and lower spiral pipes of the spiral heat exchange unit. The second part of the spacer is disposed in the middle isolation area between every two adjacent turbulence strips, and is used to fix and connect every two adjacent turbulence strips. The first part and the second part of the spacer are respectively fixedly connected to or detachably connected to the turbulence strips.

2. The heat exchange device according to claim 1, characterized in that, The heat exchange device includes multiple spiral heat exchange units, and the housing includes an inner housing and an outer housing. The multiple spiral heat exchange units are disposed between the inner housing and the outer housing. At least one turbulence unit is disposed between the inner housing and an adjacent spiral heat exchange unit, between the outer housing and an adjacent spiral heat exchange unit, and / or between two adjacent spiral heat exchange units.

3. The heat exchange device according to claim 1, characterized in that, Each of the aforementioned turbulence strips is configured according to the spiral direction, angle, and pitch of the upper and lower spiral pipes in the spiral heat exchange unit.

4. The heat exchange device according to claim 1, characterized in that, The cross-sectional shape of the spoiler is circular, right-angled triangle, or equilateral triangle. When the cross-sectional shape of the spoiler is a right-angled triangle or equilateral triangle, one of the planes of the spoiler is parallel to the shell.

5. The heat exchange device according to any one of claims 1-4, characterized in that, At least one flow guide groove is provided on the side of the turbulence strip closest to the spiral heat exchange unit.

6. The heat exchange device according to claim 5, characterized in that, The equivalent diameter of each of the aforementioned baffle strips is set to 3mm, the arrangement density is set to full row, and the diameter of the guide groove is set to a semicircle of 1mm; When the cross-sectional shape of the spoiler strip is circular or equilateral triangle, the length of each segment of the spoiler strip is set to be greater than or equal to 27mm and less than or equal to 67.5mm; When the cross-sectional shape of the spoiler strip is a right triangle, the length of each spoiler strip segment is set to be greater than or equal to 27 mm and less than or equal to 40.5 mm.

7. The heat exchange device according to claim 6, characterized in that, Each of the aforementioned spoiler strips has a circular cross-sectional shape and a length of 67.5 mm.

8. The heat exchange device according to claim 5, characterized in that, The spiral heat exchange unit is made of copper or titanium and is a spiral pipe with external threads or twists.

9. The heat exchange device according to claim 5, characterized in that, The spiral heat exchange unit is made of copper or titanium and is a spiral pipe with external threads or twists.

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